Version:  2.0.40 2.2.26 2.4.37 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17

Linux/drivers/usb/host/fusbh200-hcd.c

  1 /*
  2  * Faraday FUSBH200 EHCI-like driver
  3  *
  4  * Copyright (c) 2013 Faraday Technology Corporation
  5  *
  6  * Author: Yuan-Hsin Chen <yhchen@faraday-tech.com>
  7  *         Feng-Hsin Chiang <john453@faraday-tech.com>
  8  *         Po-Yu Chuang <ratbert.chuang@gmail.com>
  9  *
 10  * Most of code borrowed from the Linux-3.7 EHCI driver
 11  *
 12  * This program is free software; you can redistribute it and/or modify it
 13  * under the terms of the GNU General Public License as published by the
 14  * Free Software Foundation; either version 2 of the License, or (at your
 15  * option) any later version.
 16  *
 17  * This program is distributed in the hope that it will be useful, but
 18  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 19  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 20  * for more details.
 21  *
 22  * You should have received a copy of the GNU General Public License
 23  * along with this program; if not, write to the Free Software Foundation,
 24  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 25  */
 26 
 27 #include <linux/module.h>
 28 #include <linux/device.h>
 29 #include <linux/dmapool.h>
 30 #include <linux/kernel.h>
 31 #include <linux/delay.h>
 32 #include <linux/ioport.h>
 33 #include <linux/sched.h>
 34 #include <linux/vmalloc.h>
 35 #include <linux/errno.h>
 36 #include <linux/init.h>
 37 #include <linux/hrtimer.h>
 38 #include <linux/list.h>
 39 #include <linux/interrupt.h>
 40 #include <linux/usb.h>
 41 #include <linux/usb/hcd.h>
 42 #include <linux/moduleparam.h>
 43 #include <linux/dma-mapping.h>
 44 #include <linux/debugfs.h>
 45 #include <linux/slab.h>
 46 #include <linux/uaccess.h>
 47 #include <linux/platform_device.h>
 48 
 49 #include <asm/byteorder.h>
 50 #include <asm/io.h>
 51 #include <asm/irq.h>
 52 #include <asm/unaligned.h>
 53 
 54 /*-------------------------------------------------------------------------*/
 55 #define DRIVER_AUTHOR "Yuan-Hsin Chen"
 56 #define DRIVER_DESC "FUSBH200 Host Controller (EHCI) Driver"
 57 
 58 static const char       hcd_name [] = "fusbh200_hcd";
 59 
 60 #undef FUSBH200_URB_TRACE
 61 
 62 /* magic numbers that can affect system performance */
 63 #define FUSBH200_TUNE_CERR              3       /* 0-3 qtd retries; 0 == don't stop */
 64 #define FUSBH200_TUNE_RL_HS             4       /* nak throttle; see 4.9 */
 65 #define FUSBH200_TUNE_RL_TT             0
 66 #define FUSBH200_TUNE_MULT_HS   1       /* 1-3 transactions/uframe; 4.10.3 */
 67 #define FUSBH200_TUNE_MULT_TT   1
 68 /*
 69  * Some drivers think it's safe to schedule isochronous transfers more than
 70  * 256 ms into the future (partly as a result of an old bug in the scheduling
 71  * code).  In an attempt to avoid trouble, we will use a minimum scheduling
 72  * length of 512 frames instead of 256.
 73  */
 74 #define FUSBH200_TUNE_FLS               1       /* (medium) 512-frame schedule */
 75 
 76 /* Initial IRQ latency:  faster than hw default */
 77 static int log2_irq_thresh = 0;         // 0 to 6
 78 module_param (log2_irq_thresh, int, S_IRUGO);
 79 MODULE_PARM_DESC (log2_irq_thresh, "log2 IRQ latency, 1-64 microframes");
 80 
 81 /* initial park setting:  slower than hw default */
 82 static unsigned park = 0;
 83 module_param (park, uint, S_IRUGO);
 84 MODULE_PARM_DESC (park, "park setting; 1-3 back-to-back async packets");
 85 
 86 /* for link power management(LPM) feature */
 87 static unsigned int hird;
 88 module_param(hird, int, S_IRUGO);
 89 MODULE_PARM_DESC(hird, "host initiated resume duration, +1 for each 75us");
 90 
 91 #define INTR_MASK (STS_IAA | STS_FATAL | STS_PCD | STS_ERR | STS_INT)
 92 
 93 #include "fusbh200.h"
 94 
 95 /*-------------------------------------------------------------------------*/
 96 
 97 #define fusbh200_dbg(fusbh200, fmt, args...) \
 98         dev_dbg (fusbh200_to_hcd(fusbh200)->self.controller , fmt , ## args )
 99 #define fusbh200_err(fusbh200, fmt, args...) \
100         dev_err (fusbh200_to_hcd(fusbh200)->self.controller , fmt , ## args )
101 #define fusbh200_info(fusbh200, fmt, args...) \
102         dev_info (fusbh200_to_hcd(fusbh200)->self.controller , fmt , ## args )
103 #define fusbh200_warn(fusbh200, fmt, args...) \
104         dev_warn (fusbh200_to_hcd(fusbh200)->self.controller , fmt , ## args )
105 
106 /* check the values in the HCSPARAMS register
107  * (host controller _Structural_ parameters)
108  * see EHCI spec, Table 2-4 for each value
109  */
110 static void dbg_hcs_params (struct fusbh200_hcd *fusbh200, char *label)
111 {
112         u32     params = fusbh200_readl(fusbh200, &fusbh200->caps->hcs_params);
113 
114         fusbh200_dbg (fusbh200,
115                 "%s hcs_params 0x%x ports=%d\n",
116                 label, params,
117                 HCS_N_PORTS (params)
118                 );
119 }
120 
121 /* check the values in the HCCPARAMS register
122  * (host controller _Capability_ parameters)
123  * see EHCI Spec, Table 2-5 for each value
124  * */
125 static void dbg_hcc_params (struct fusbh200_hcd *fusbh200, char *label)
126 {
127         u32     params = fusbh200_readl(fusbh200, &fusbh200->caps->hcc_params);
128 
129         fusbh200_dbg (fusbh200,
130                 "%s hcc_params %04x uframes %s%s\n",
131                 label,
132                 params,
133                 HCC_PGM_FRAMELISTLEN(params) ? "256/512/1024" : "1024",
134                 HCC_CANPARK(params) ? " park" : "");
135 }
136 
137 static void __maybe_unused
138 dbg_qtd (const char *label, struct fusbh200_hcd *fusbh200, struct fusbh200_qtd *qtd)
139 {
140         fusbh200_dbg(fusbh200, "%s td %p n%08x %08x t%08x p0=%08x\n", label, qtd,
141                 hc32_to_cpup(fusbh200, &qtd->hw_next),
142                 hc32_to_cpup(fusbh200, &qtd->hw_alt_next),
143                 hc32_to_cpup(fusbh200, &qtd->hw_token),
144                 hc32_to_cpup(fusbh200, &qtd->hw_buf [0]));
145         if (qtd->hw_buf [1])
146                 fusbh200_dbg(fusbh200, "  p1=%08x p2=%08x p3=%08x p4=%08x\n",
147                         hc32_to_cpup(fusbh200, &qtd->hw_buf[1]),
148                         hc32_to_cpup(fusbh200, &qtd->hw_buf[2]),
149                         hc32_to_cpup(fusbh200, &qtd->hw_buf[3]),
150                         hc32_to_cpup(fusbh200, &qtd->hw_buf[4]));
151 }
152 
153 static void __maybe_unused
154 dbg_qh (const char *label, struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh)
155 {
156         struct fusbh200_qh_hw *hw = qh->hw;
157 
158         fusbh200_dbg (fusbh200, "%s qh %p n%08x info %x %x qtd %x\n", label,
159                 qh, hw->hw_next, hw->hw_info1, hw->hw_info2, hw->hw_current);
160         dbg_qtd("overlay", fusbh200, (struct fusbh200_qtd *) &hw->hw_qtd_next);
161 }
162 
163 static void __maybe_unused
164 dbg_itd (const char *label, struct fusbh200_hcd *fusbh200, struct fusbh200_itd *itd)
165 {
166         fusbh200_dbg (fusbh200, "%s [%d] itd %p, next %08x, urb %p\n",
167                 label, itd->frame, itd, hc32_to_cpu(fusbh200, itd->hw_next),
168                 itd->urb);
169         fusbh200_dbg (fusbh200,
170                 "  trans: %08x %08x %08x %08x %08x %08x %08x %08x\n",
171                 hc32_to_cpu(fusbh200, itd->hw_transaction[0]),
172                 hc32_to_cpu(fusbh200, itd->hw_transaction[1]),
173                 hc32_to_cpu(fusbh200, itd->hw_transaction[2]),
174                 hc32_to_cpu(fusbh200, itd->hw_transaction[3]),
175                 hc32_to_cpu(fusbh200, itd->hw_transaction[4]),
176                 hc32_to_cpu(fusbh200, itd->hw_transaction[5]),
177                 hc32_to_cpu(fusbh200, itd->hw_transaction[6]),
178                 hc32_to_cpu(fusbh200, itd->hw_transaction[7]));
179         fusbh200_dbg (fusbh200,
180                 "  buf:   %08x %08x %08x %08x %08x %08x %08x\n",
181                 hc32_to_cpu(fusbh200, itd->hw_bufp[0]),
182                 hc32_to_cpu(fusbh200, itd->hw_bufp[1]),
183                 hc32_to_cpu(fusbh200, itd->hw_bufp[2]),
184                 hc32_to_cpu(fusbh200, itd->hw_bufp[3]),
185                 hc32_to_cpu(fusbh200, itd->hw_bufp[4]),
186                 hc32_to_cpu(fusbh200, itd->hw_bufp[5]),
187                 hc32_to_cpu(fusbh200, itd->hw_bufp[6]));
188         fusbh200_dbg (fusbh200, "  index: %d %d %d %d %d %d %d %d\n",
189                 itd->index[0], itd->index[1], itd->index[2],
190                 itd->index[3], itd->index[4], itd->index[5],
191                 itd->index[6], itd->index[7]);
192 }
193 
194 static int __maybe_unused
195 dbg_status_buf (char *buf, unsigned len, const char *label, u32 status)
196 {
197         return scnprintf (buf, len,
198                 "%s%sstatus %04x%s%s%s%s%s%s%s%s%s%s",
199                 label, label [0] ? " " : "", status,
200                 (status & STS_ASS) ? " Async" : "",
201                 (status & STS_PSS) ? " Periodic" : "",
202                 (status & STS_RECL) ? " Recl" : "",
203                 (status & STS_HALT) ? " Halt" : "",
204                 (status & STS_IAA) ? " IAA" : "",
205                 (status & STS_FATAL) ? " FATAL" : "",
206                 (status & STS_FLR) ? " FLR" : "",
207                 (status & STS_PCD) ? " PCD" : "",
208                 (status & STS_ERR) ? " ERR" : "",
209                 (status & STS_INT) ? " INT" : ""
210                 );
211 }
212 
213 static int __maybe_unused
214 dbg_intr_buf (char *buf, unsigned len, const char *label, u32 enable)
215 {
216         return scnprintf (buf, len,
217                 "%s%sintrenable %02x%s%s%s%s%s%s",
218                 label, label [0] ? " " : "", enable,
219                 (enable & STS_IAA) ? " IAA" : "",
220                 (enable & STS_FATAL) ? " FATAL" : "",
221                 (enable & STS_FLR) ? " FLR" : "",
222                 (enable & STS_PCD) ? " PCD" : "",
223                 (enable & STS_ERR) ? " ERR" : "",
224                 (enable & STS_INT) ? " INT" : ""
225                 );
226 }
227 
228 static const char *const fls_strings [] =
229     { "1024", "512", "256", "??" };
230 
231 static int
232 dbg_command_buf (char *buf, unsigned len, const char *label, u32 command)
233 {
234         return scnprintf (buf, len,
235                 "%s%scommand %07x %s=%d ithresh=%d%s%s%s "
236                 "period=%s%s %s",
237                 label, label [0] ? " " : "", command,
238                 (command & CMD_PARK) ? " park" : "(park)",
239                 CMD_PARK_CNT (command),
240                 (command >> 16) & 0x3f,
241                 (command & CMD_IAAD) ? " IAAD" : "",
242                 (command & CMD_ASE) ? " Async" : "",
243                 (command & CMD_PSE) ? " Periodic" : "",
244                 fls_strings [(command >> 2) & 0x3],
245                 (command & CMD_RESET) ? " Reset" : "",
246                 (command & CMD_RUN) ? "RUN" : "HALT"
247                 );
248 }
249 
250 static int
251 dbg_port_buf (char *buf, unsigned len, const char *label, int port, u32 status)
252 {
253         char    *sig;
254 
255         /* signaling state */
256         switch (status & (3 << 10)) {
257         case 0 << 10: sig = "se0"; break;
258         case 1 << 10: sig = "k"; break;         /* low speed */
259         case 2 << 10: sig = "j"; break;
260         default: sig = "?"; break;
261         }
262 
263         return scnprintf (buf, len,
264                 "%s%sport:%d status %06x %d "
265                 "sig=%s%s%s%s%s%s%s%s",
266                 label, label [0] ? " " : "", port, status,
267                 status>>25,/*device address */
268                 sig,
269                 (status & PORT_RESET) ? " RESET" : "",
270                 (status & PORT_SUSPEND) ? " SUSPEND" : "",
271                 (status & PORT_RESUME) ? " RESUME" : "",
272                 (status & PORT_PEC) ? " PEC" : "",
273                 (status & PORT_PE) ? " PE" : "",
274                 (status & PORT_CSC) ? " CSC" : "",
275                 (status & PORT_CONNECT) ? " CONNECT" : "");
276 }
277 
278 /* functions have the "wrong" filename when they're output... */
279 #define dbg_status(fusbh200, label, status) { \
280         char _buf [80]; \
281         dbg_status_buf (_buf, sizeof _buf, label, status); \
282         fusbh200_dbg (fusbh200, "%s\n", _buf); \
283 }
284 
285 #define dbg_cmd(fusbh200, label, command) { \
286         char _buf [80]; \
287         dbg_command_buf (_buf, sizeof _buf, label, command); \
288         fusbh200_dbg (fusbh200, "%s\n", _buf); \
289 }
290 
291 #define dbg_port(fusbh200, label, port, status) { \
292         char _buf [80]; \
293         dbg_port_buf (_buf, sizeof _buf, label, port, status); \
294         fusbh200_dbg (fusbh200, "%s\n", _buf); \
295 }
296 
297 /*-------------------------------------------------------------------------*/
298 
299 /* troubleshooting help: expose state in debugfs */
300 
301 static int debug_async_open(struct inode *, struct file *);
302 static int debug_periodic_open(struct inode *, struct file *);
303 static int debug_registers_open(struct inode *, struct file *);
304 static int debug_async_open(struct inode *, struct file *);
305 
306 static ssize_t debug_output(struct file*, char __user*, size_t, loff_t*);
307 static int debug_close(struct inode *, struct file *);
308 
309 static const struct file_operations debug_async_fops = {
310         .owner          = THIS_MODULE,
311         .open           = debug_async_open,
312         .read           = debug_output,
313         .release        = debug_close,
314         .llseek         = default_llseek,
315 };
316 static const struct file_operations debug_periodic_fops = {
317         .owner          = THIS_MODULE,
318         .open           = debug_periodic_open,
319         .read           = debug_output,
320         .release        = debug_close,
321         .llseek         = default_llseek,
322 };
323 static const struct file_operations debug_registers_fops = {
324         .owner          = THIS_MODULE,
325         .open           = debug_registers_open,
326         .read           = debug_output,
327         .release        = debug_close,
328         .llseek         = default_llseek,
329 };
330 
331 static struct dentry *fusbh200_debug_root;
332 
333 struct debug_buffer {
334         ssize_t (*fill_func)(struct debug_buffer *);    /* fill method */
335         struct usb_bus *bus;
336         struct mutex mutex;     /* protect filling of buffer */
337         size_t count;           /* number of characters filled into buffer */
338         char *output_buf;
339         size_t alloc_size;
340 };
341 
342 #define speed_char(info1) ({ char tmp; \
343                 switch (info1 & (3 << 12)) { \
344                 case QH_FULL_SPEED: tmp = 'f'; break; \
345                 case QH_LOW_SPEED:  tmp = 'l'; break; \
346                 case QH_HIGH_SPEED: tmp = 'h'; break; \
347                 default: tmp = '?'; break; \
348                 } tmp; })
349 
350 static inline char token_mark(struct fusbh200_hcd *fusbh200, __hc32 token)
351 {
352         __u32 v = hc32_to_cpu(fusbh200, token);
353 
354         if (v & QTD_STS_ACTIVE)
355                 return '*';
356         if (v & QTD_STS_HALT)
357                 return '-';
358         if (!IS_SHORT_READ (v))
359                 return ' ';
360         /* tries to advance through hw_alt_next */
361         return '/';
362 }
363 
364 static void qh_lines (
365         struct fusbh200_hcd *fusbh200,
366         struct fusbh200_qh *qh,
367         char **nextp,
368         unsigned *sizep
369 )
370 {
371         u32                     scratch;
372         u32                     hw_curr;
373         struct fusbh200_qtd             *td;
374         unsigned                temp;
375         unsigned                size = *sizep;
376         char                    *next = *nextp;
377         char                    mark;
378         __le32                  list_end = FUSBH200_LIST_END(fusbh200);
379         struct fusbh200_qh_hw   *hw = qh->hw;
380 
381         if (hw->hw_qtd_next == list_end)        /* NEC does this */
382                 mark = '@';
383         else
384                 mark = token_mark(fusbh200, hw->hw_token);
385         if (mark == '/') {      /* qh_alt_next controls qh advance? */
386                 if ((hw->hw_alt_next & QTD_MASK(fusbh200))
387                                 == fusbh200->async->hw->hw_alt_next)
388                         mark = '#';     /* blocked */
389                 else if (hw->hw_alt_next == list_end)
390                         mark = '.';     /* use hw_qtd_next */
391                 /* else alt_next points to some other qtd */
392         }
393         scratch = hc32_to_cpup(fusbh200, &hw->hw_info1);
394         hw_curr = (mark == '*') ? hc32_to_cpup(fusbh200, &hw->hw_current) : 0;
395         temp = scnprintf (next, size,
396                         "qh/%p dev%d %cs ep%d %08x %08x (%08x%c %s nak%d)",
397                         qh, scratch & 0x007f,
398                         speed_char (scratch),
399                         (scratch >> 8) & 0x000f,
400                         scratch, hc32_to_cpup(fusbh200, &hw->hw_info2),
401                         hc32_to_cpup(fusbh200, &hw->hw_token), mark,
402                         (cpu_to_hc32(fusbh200, QTD_TOGGLE) & hw->hw_token)
403                                 ? "data1" : "data0",
404                         (hc32_to_cpup(fusbh200, &hw->hw_alt_next) >> 1) & 0x0f);
405         size -= temp;
406         next += temp;
407 
408         /* hc may be modifying the list as we read it ... */
409         list_for_each_entry(td, &qh->qtd_list, qtd_list) {
410                 scratch = hc32_to_cpup(fusbh200, &td->hw_token);
411                 mark = ' ';
412                 if (hw_curr == td->qtd_dma)
413                         mark = '*';
414                 else if (hw->hw_qtd_next == cpu_to_hc32(fusbh200, td->qtd_dma))
415                         mark = '+';
416                 else if (QTD_LENGTH (scratch)) {
417                         if (td->hw_alt_next == fusbh200->async->hw->hw_alt_next)
418                                 mark = '#';
419                         else if (td->hw_alt_next != list_end)
420                                 mark = '/';
421                 }
422                 temp = snprintf (next, size,
423                                 "\n\t%p%c%s len=%d %08x urb %p",
424                                 td, mark, ({ char *tmp;
425                                  switch ((scratch>>8)&0x03) {
426                                  case 0: tmp = "out"; break;
427                                  case 1: tmp = "in"; break;
428                                  case 2: tmp = "setup"; break;
429                                  default: tmp = "?"; break;
430                                  } tmp;}),
431                                 (scratch >> 16) & 0x7fff,
432                                 scratch,
433                                 td->urb);
434                 if (size < temp)
435                         temp = size;
436                 size -= temp;
437                 next += temp;
438                 if (temp == size)
439                         goto done;
440         }
441 
442         temp = snprintf (next, size, "\n");
443         if (size < temp)
444                 temp = size;
445         size -= temp;
446         next += temp;
447 
448 done:
449         *sizep = size;
450         *nextp = next;
451 }
452 
453 static ssize_t fill_async_buffer(struct debug_buffer *buf)
454 {
455         struct usb_hcd          *hcd;
456         struct fusbh200_hcd     *fusbh200;
457         unsigned long           flags;
458         unsigned                temp, size;
459         char                    *next;
460         struct fusbh200_qh              *qh;
461 
462         hcd = bus_to_hcd(buf->bus);
463         fusbh200 = hcd_to_fusbh200 (hcd);
464         next = buf->output_buf;
465         size = buf->alloc_size;
466 
467         *next = 0;
468 
469         /* dumps a snapshot of the async schedule.
470          * usually empty except for long-term bulk reads, or head.
471          * one QH per line, and TDs we know about
472          */
473         spin_lock_irqsave (&fusbh200->lock, flags);
474         for (qh = fusbh200->async->qh_next.qh; size > 0 && qh; qh = qh->qh_next.qh)
475                 qh_lines (fusbh200, qh, &next, &size);
476         if (fusbh200->async_unlink && size > 0) {
477                 temp = scnprintf(next, size, "\nunlink =\n");
478                 size -= temp;
479                 next += temp;
480 
481                 for (qh = fusbh200->async_unlink; size > 0 && qh;
482                                 qh = qh->unlink_next)
483                         qh_lines (fusbh200, qh, &next, &size);
484         }
485         spin_unlock_irqrestore (&fusbh200->lock, flags);
486 
487         return strlen(buf->output_buf);
488 }
489 
490 #define DBG_SCHED_LIMIT 64
491 static ssize_t fill_periodic_buffer(struct debug_buffer *buf)
492 {
493         struct usb_hcd          *hcd;
494         struct fusbh200_hcd             *fusbh200;
495         unsigned long           flags;
496         union fusbh200_shadow   p, *seen;
497         unsigned                temp, size, seen_count;
498         char                    *next;
499         unsigned                i;
500         __hc32                  tag;
501 
502         if (!(seen = kmalloc (DBG_SCHED_LIMIT * sizeof *seen, GFP_ATOMIC)))
503                 return 0;
504         seen_count = 0;
505 
506         hcd = bus_to_hcd(buf->bus);
507         fusbh200 = hcd_to_fusbh200 (hcd);
508         next = buf->output_buf;
509         size = buf->alloc_size;
510 
511         temp = scnprintf (next, size, "size = %d\n", fusbh200->periodic_size);
512         size -= temp;
513         next += temp;
514 
515         /* dump a snapshot of the periodic schedule.
516          * iso changes, interrupt usually doesn't.
517          */
518         spin_lock_irqsave (&fusbh200->lock, flags);
519         for (i = 0; i < fusbh200->periodic_size; i++) {
520                 p = fusbh200->pshadow [i];
521                 if (likely (!p.ptr))
522                         continue;
523                 tag = Q_NEXT_TYPE(fusbh200, fusbh200->periodic [i]);
524 
525                 temp = scnprintf (next, size, "%4d: ", i);
526                 size -= temp;
527                 next += temp;
528 
529                 do {
530                         struct fusbh200_qh_hw *hw;
531 
532                         switch (hc32_to_cpu(fusbh200, tag)) {
533                         case Q_TYPE_QH:
534                                 hw = p.qh->hw;
535                                 temp = scnprintf (next, size, " qh%d-%04x/%p",
536                                                 p.qh->period,
537                                                 hc32_to_cpup(fusbh200,
538                                                         &hw->hw_info2)
539                                                         /* uframe masks */
540                                                         & (QH_CMASK | QH_SMASK),
541                                                 p.qh);
542                                 size -= temp;
543                                 next += temp;
544                                 /* don't repeat what follows this qh */
545                                 for (temp = 0; temp < seen_count; temp++) {
546                                         if (seen [temp].ptr != p.ptr)
547                                                 continue;
548                                         if (p.qh->qh_next.ptr) {
549                                                 temp = scnprintf (next, size,
550                                                         " ...");
551                                                 size -= temp;
552                                                 next += temp;
553                                         }
554                                         break;
555                                 }
556                                 /* show more info the first time around */
557                                 if (temp == seen_count) {
558                                         u32     scratch = hc32_to_cpup(fusbh200,
559                                                         &hw->hw_info1);
560                                         struct fusbh200_qtd     *qtd;
561                                         char            *type = "";
562 
563                                         /* count tds, get ep direction */
564                                         temp = 0;
565                                         list_for_each_entry (qtd,
566                                                         &p.qh->qtd_list,
567                                                         qtd_list) {
568                                                 temp++;
569                                                 switch (0x03 & (hc32_to_cpu(
570                                                         fusbh200,
571                                                         qtd->hw_token) >> 8)) {
572                                                 case 0: type = "out"; continue;
573                                                 case 1: type = "in"; continue;
574                                                 }
575                                         }
576 
577                                         temp = scnprintf (next, size,
578                                                 " (%c%d ep%d%s "
579                                                 "[%d/%d] q%d p%d)",
580                                                 speed_char (scratch),
581                                                 scratch & 0x007f,
582                                                 (scratch >> 8) & 0x000f, type,
583                                                 p.qh->usecs, p.qh->c_usecs,
584                                                 temp,
585                                                 0x7ff & (scratch >> 16));
586 
587                                         if (seen_count < DBG_SCHED_LIMIT)
588                                                 seen [seen_count++].qh = p.qh;
589                                 } else
590                                         temp = 0;
591                                 tag = Q_NEXT_TYPE(fusbh200, hw->hw_next);
592                                 p = p.qh->qh_next;
593                                 break;
594                         case Q_TYPE_FSTN:
595                                 temp = scnprintf (next, size,
596                                         " fstn-%8x/%p", p.fstn->hw_prev,
597                                         p.fstn);
598                                 tag = Q_NEXT_TYPE(fusbh200, p.fstn->hw_next);
599                                 p = p.fstn->fstn_next;
600                                 break;
601                         case Q_TYPE_ITD:
602                                 temp = scnprintf (next, size,
603                                         " itd/%p", p.itd);
604                                 tag = Q_NEXT_TYPE(fusbh200, p.itd->hw_next);
605                                 p = p.itd->itd_next;
606                                 break;
607                         }
608                         size -= temp;
609                         next += temp;
610                 } while (p.ptr);
611 
612                 temp = scnprintf (next, size, "\n");
613                 size -= temp;
614                 next += temp;
615         }
616         spin_unlock_irqrestore (&fusbh200->lock, flags);
617         kfree (seen);
618 
619         return buf->alloc_size - size;
620 }
621 #undef DBG_SCHED_LIMIT
622 
623 static const char *rh_state_string(struct fusbh200_hcd *fusbh200)
624 {
625         switch (fusbh200->rh_state) {
626         case FUSBH200_RH_HALTED:
627                 return "halted";
628         case FUSBH200_RH_SUSPENDED:
629                 return "suspended";
630         case FUSBH200_RH_RUNNING:
631                 return "running";
632         case FUSBH200_RH_STOPPING:
633                 return "stopping";
634         }
635         return "?";
636 }
637 
638 static ssize_t fill_registers_buffer(struct debug_buffer *buf)
639 {
640         struct usb_hcd          *hcd;
641         struct fusbh200_hcd     *fusbh200;
642         unsigned long           flags;
643         unsigned                temp, size, i;
644         char                    *next, scratch [80];
645         static char             fmt [] = "%*s\n";
646         static char             label [] = "";
647 
648         hcd = bus_to_hcd(buf->bus);
649         fusbh200 = hcd_to_fusbh200 (hcd);
650         next = buf->output_buf;
651         size = buf->alloc_size;
652 
653         spin_lock_irqsave (&fusbh200->lock, flags);
654 
655         if (!HCD_HW_ACCESSIBLE(hcd)) {
656                 size = scnprintf (next, size,
657                         "bus %s, device %s\n"
658                         "%s\n"
659                         "SUSPENDED (no register access)\n",
660                         hcd->self.controller->bus->name,
661                         dev_name(hcd->self.controller),
662                         hcd->product_desc);
663                 goto done;
664         }
665 
666         /* Capability Registers */
667         i = HC_VERSION(fusbh200, fusbh200_readl(fusbh200, &fusbh200->caps->hc_capbase));
668         temp = scnprintf (next, size,
669                 "bus %s, device %s\n"
670                 "%s\n"
671                 "EHCI %x.%02x, rh state %s\n",
672                 hcd->self.controller->bus->name,
673                 dev_name(hcd->self.controller),
674                 hcd->product_desc,
675                 i >> 8, i & 0x0ff, rh_state_string(fusbh200));
676         size -= temp;
677         next += temp;
678 
679         // FIXME interpret both types of params
680         i = fusbh200_readl(fusbh200, &fusbh200->caps->hcs_params);
681         temp = scnprintf (next, size, "structural params 0x%08x\n", i);
682         size -= temp;
683         next += temp;
684 
685         i = fusbh200_readl(fusbh200, &fusbh200->caps->hcc_params);
686         temp = scnprintf (next, size, "capability params 0x%08x\n", i);
687         size -= temp;
688         next += temp;
689 
690         /* Operational Registers */
691         temp = dbg_status_buf (scratch, sizeof scratch, label,
692                         fusbh200_readl(fusbh200, &fusbh200->regs->status));
693         temp = scnprintf (next, size, fmt, temp, scratch);
694         size -= temp;
695         next += temp;
696 
697         temp = dbg_command_buf (scratch, sizeof scratch, label,
698                         fusbh200_readl(fusbh200, &fusbh200->regs->command));
699         temp = scnprintf (next, size, fmt, temp, scratch);
700         size -= temp;
701         next += temp;
702 
703         temp = dbg_intr_buf (scratch, sizeof scratch, label,
704                         fusbh200_readl(fusbh200, &fusbh200->regs->intr_enable));
705         temp = scnprintf (next, size, fmt, temp, scratch);
706         size -= temp;
707         next += temp;
708 
709         temp = scnprintf (next, size, "uframe %04x\n",
710                         fusbh200_read_frame_index(fusbh200));
711         size -= temp;
712         next += temp;
713 
714         if (fusbh200->async_unlink) {
715                 temp = scnprintf(next, size, "async unlink qh %p\n",
716                                 fusbh200->async_unlink);
717                 size -= temp;
718                 next += temp;
719         }
720 
721         temp = scnprintf (next, size,
722                 "irq normal %ld err %ld iaa %ld (lost %ld)\n",
723                 fusbh200->stats.normal, fusbh200->stats.error, fusbh200->stats.iaa,
724                 fusbh200->stats.lost_iaa);
725         size -= temp;
726         next += temp;
727 
728         temp = scnprintf (next, size, "complete %ld unlink %ld\n",
729                 fusbh200->stats.complete, fusbh200->stats.unlink);
730         size -= temp;
731         next += temp;
732 
733 done:
734         spin_unlock_irqrestore (&fusbh200->lock, flags);
735 
736         return buf->alloc_size - size;
737 }
738 
739 static struct debug_buffer *alloc_buffer(struct usb_bus *bus,
740                                 ssize_t (*fill_func)(struct debug_buffer *))
741 {
742         struct debug_buffer *buf;
743 
744         buf = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL);
745 
746         if (buf) {
747                 buf->bus = bus;
748                 buf->fill_func = fill_func;
749                 mutex_init(&buf->mutex);
750                 buf->alloc_size = PAGE_SIZE;
751         }
752 
753         return buf;
754 }
755 
756 static int fill_buffer(struct debug_buffer *buf)
757 {
758         int ret = 0;
759 
760         if (!buf->output_buf)
761                 buf->output_buf = vmalloc(buf->alloc_size);
762 
763         if (!buf->output_buf) {
764                 ret = -ENOMEM;
765                 goto out;
766         }
767 
768         ret = buf->fill_func(buf);
769 
770         if (ret >= 0) {
771                 buf->count = ret;
772                 ret = 0;
773         }
774 
775 out:
776         return ret;
777 }
778 
779 static ssize_t debug_output(struct file *file, char __user *user_buf,
780                             size_t len, loff_t *offset)
781 {
782         struct debug_buffer *buf = file->private_data;
783         int ret = 0;
784 
785         mutex_lock(&buf->mutex);
786         if (buf->count == 0) {
787                 ret = fill_buffer(buf);
788                 if (ret != 0) {
789                         mutex_unlock(&buf->mutex);
790                         goto out;
791                 }
792         }
793         mutex_unlock(&buf->mutex);
794 
795         ret = simple_read_from_buffer(user_buf, len, offset,
796                                       buf->output_buf, buf->count);
797 
798 out:
799         return ret;
800 
801 }
802 
803 static int debug_close(struct inode *inode, struct file *file)
804 {
805         struct debug_buffer *buf = file->private_data;
806 
807         if (buf) {
808                 vfree(buf->output_buf);
809                 kfree(buf);
810         }
811 
812         return 0;
813 }
814 static int debug_async_open(struct inode *inode, struct file *file)
815 {
816         file->private_data = alloc_buffer(inode->i_private, fill_async_buffer);
817 
818         return file->private_data ? 0 : -ENOMEM;
819 }
820 
821 static int debug_periodic_open(struct inode *inode, struct file *file)
822 {
823         struct debug_buffer *buf;
824         buf = alloc_buffer(inode->i_private, fill_periodic_buffer);
825         if (!buf)
826                 return -ENOMEM;
827 
828         buf->alloc_size = (sizeof(void *) == 4 ? 6 : 8)*PAGE_SIZE;
829         file->private_data = buf;
830         return 0;
831 }
832 
833 static int debug_registers_open(struct inode *inode, struct file *file)
834 {
835         file->private_data = alloc_buffer(inode->i_private,
836                                           fill_registers_buffer);
837 
838         return file->private_data ? 0 : -ENOMEM;
839 }
840 
841 static inline void create_debug_files (struct fusbh200_hcd *fusbh200)
842 {
843         struct usb_bus *bus = &fusbh200_to_hcd(fusbh200)->self;
844 
845         fusbh200->debug_dir = debugfs_create_dir(bus->bus_name, fusbh200_debug_root);
846         if (!fusbh200->debug_dir)
847                 return;
848 
849         if (!debugfs_create_file("async", S_IRUGO, fusbh200->debug_dir, bus,
850                                                 &debug_async_fops))
851                 goto file_error;
852 
853         if (!debugfs_create_file("periodic", S_IRUGO, fusbh200->debug_dir, bus,
854                                                 &debug_periodic_fops))
855                 goto file_error;
856 
857         if (!debugfs_create_file("registers", S_IRUGO, fusbh200->debug_dir, bus,
858                                                     &debug_registers_fops))
859                 goto file_error;
860 
861         return;
862 
863 file_error:
864         debugfs_remove_recursive(fusbh200->debug_dir);
865 }
866 
867 static inline void remove_debug_files (struct fusbh200_hcd *fusbh200)
868 {
869         debugfs_remove_recursive(fusbh200->debug_dir);
870 }
871 
872 /*-------------------------------------------------------------------------*/
873 
874 /*
875  * handshake - spin reading hc until handshake completes or fails
876  * @ptr: address of hc register to be read
877  * @mask: bits to look at in result of read
878  * @done: value of those bits when handshake succeeds
879  * @usec: timeout in microseconds
880  *
881  * Returns negative errno, or zero on success
882  *
883  * Success happens when the "mask" bits have the specified value (hardware
884  * handshake done).  There are two failure modes:  "usec" have passed (major
885  * hardware flakeout), or the register reads as all-ones (hardware removed).
886  *
887  * That last failure should_only happen in cases like physical cardbus eject
888  * before driver shutdown. But it also seems to be caused by bugs in cardbus
889  * bridge shutdown:  shutting down the bridge before the devices using it.
890  */
891 static int handshake (struct fusbh200_hcd *fusbh200, void __iomem *ptr,
892                       u32 mask, u32 done, int usec)
893 {
894         u32     result;
895 
896         do {
897                 result = fusbh200_readl(fusbh200, ptr);
898                 if (result == ~(u32)0)          /* card removed */
899                         return -ENODEV;
900                 result &= mask;
901                 if (result == done)
902                         return 0;
903                 udelay (1);
904                 usec--;
905         } while (usec > 0);
906         return -ETIMEDOUT;
907 }
908 
909 /*
910  * Force HC to halt state from unknown (EHCI spec section 2.3).
911  * Must be called with interrupts enabled and the lock not held.
912  */
913 static int fusbh200_halt (struct fusbh200_hcd *fusbh200)
914 {
915         u32     temp;
916 
917         spin_lock_irq(&fusbh200->lock);
918 
919         /* disable any irqs left enabled by previous code */
920         fusbh200_writel(fusbh200, 0, &fusbh200->regs->intr_enable);
921 
922         /*
923          * This routine gets called during probe before fusbh200->command
924          * has been initialized, so we can't rely on its value.
925          */
926         fusbh200->command &= ~CMD_RUN;
927         temp = fusbh200_readl(fusbh200, &fusbh200->regs->command);
928         temp &= ~(CMD_RUN | CMD_IAAD);
929         fusbh200_writel(fusbh200, temp, &fusbh200->regs->command);
930 
931         spin_unlock_irq(&fusbh200->lock);
932         synchronize_irq(fusbh200_to_hcd(fusbh200)->irq);
933 
934         return handshake(fusbh200, &fusbh200->regs->status,
935                           STS_HALT, STS_HALT, 16 * 125);
936 }
937 
938 /*
939  * Reset a non-running (STS_HALT == 1) controller.
940  * Must be called with interrupts enabled and the lock not held.
941  */
942 static int fusbh200_reset (struct fusbh200_hcd *fusbh200)
943 {
944         int     retval;
945         u32     command = fusbh200_readl(fusbh200, &fusbh200->regs->command);
946 
947         /* If the EHCI debug controller is active, special care must be
948          * taken before and after a host controller reset */
949         if (fusbh200->debug && !dbgp_reset_prep(fusbh200_to_hcd(fusbh200)))
950                 fusbh200->debug = NULL;
951 
952         command |= CMD_RESET;
953         dbg_cmd (fusbh200, "reset", command);
954         fusbh200_writel(fusbh200, command, &fusbh200->regs->command);
955         fusbh200->rh_state = FUSBH200_RH_HALTED;
956         fusbh200->next_statechange = jiffies;
957         retval = handshake (fusbh200, &fusbh200->regs->command,
958                             CMD_RESET, 0, 250 * 1000);
959 
960         if (retval)
961                 return retval;
962 
963         if (fusbh200->debug)
964                 dbgp_external_startup(fusbh200_to_hcd(fusbh200));
965 
966         fusbh200->port_c_suspend = fusbh200->suspended_ports =
967                         fusbh200->resuming_ports = 0;
968         return retval;
969 }
970 
971 /*
972  * Idle the controller (turn off the schedules).
973  * Must be called with interrupts enabled and the lock not held.
974  */
975 static void fusbh200_quiesce (struct fusbh200_hcd *fusbh200)
976 {
977         u32     temp;
978 
979         if (fusbh200->rh_state != FUSBH200_RH_RUNNING)
980                 return;
981 
982         /* wait for any schedule enables/disables to take effect */
983         temp = (fusbh200->command << 10) & (STS_ASS | STS_PSS);
984         handshake(fusbh200, &fusbh200->regs->status, STS_ASS | STS_PSS, temp, 16 * 125);
985 
986         /* then disable anything that's still active */
987         spin_lock_irq(&fusbh200->lock);
988         fusbh200->command &= ~(CMD_ASE | CMD_PSE);
989         fusbh200_writel(fusbh200, fusbh200->command, &fusbh200->regs->command);
990         spin_unlock_irq(&fusbh200->lock);
991 
992         /* hardware can take 16 microframes to turn off ... */
993         handshake(fusbh200, &fusbh200->regs->status, STS_ASS | STS_PSS, 0, 16 * 125);
994 }
995 
996 /*-------------------------------------------------------------------------*/
997 
998 static void end_unlink_async(struct fusbh200_hcd *fusbh200);
999 static void unlink_empty_async(struct fusbh200_hcd *fusbh200);
1000 static void fusbh200_work(struct fusbh200_hcd *fusbh200);
1001 static void start_unlink_intr(struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh);
1002 static void end_unlink_intr(struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh);
1003 
1004 /*-------------------------------------------------------------------------*/
1005 
1006 /* Set a bit in the USBCMD register */
1007 static void fusbh200_set_command_bit(struct fusbh200_hcd *fusbh200, u32 bit)
1008 {
1009         fusbh200->command |= bit;
1010         fusbh200_writel(fusbh200, fusbh200->command, &fusbh200->regs->command);
1011 
1012         /* unblock posted write */
1013         fusbh200_readl(fusbh200, &fusbh200->regs->command);
1014 }
1015 
1016 /* Clear a bit in the USBCMD register */
1017 static void fusbh200_clear_command_bit(struct fusbh200_hcd *fusbh200, u32 bit)
1018 {
1019         fusbh200->command &= ~bit;
1020         fusbh200_writel(fusbh200, fusbh200->command, &fusbh200->regs->command);
1021 
1022         /* unblock posted write */
1023         fusbh200_readl(fusbh200, &fusbh200->regs->command);
1024 }
1025 
1026 /*-------------------------------------------------------------------------*/
1027 
1028 /*
1029  * EHCI timer support...  Now using hrtimers.
1030  *
1031  * Lots of different events are triggered from fusbh200->hrtimer.  Whenever
1032  * the timer routine runs, it checks each possible event; events that are
1033  * currently enabled and whose expiration time has passed get handled.
1034  * The set of enabled events is stored as a collection of bitflags in
1035  * fusbh200->enabled_hrtimer_events, and they are numbered in order of
1036  * increasing delay values (ranging between 1 ms and 100 ms).
1037  *
1038  * Rather than implementing a sorted list or tree of all pending events,
1039  * we keep track only of the lowest-numbered pending event, in
1040  * fusbh200->next_hrtimer_event.  Whenever fusbh200->hrtimer gets restarted, its
1041  * expiration time is set to the timeout value for this event.
1042  *
1043  * As a result, events might not get handled right away; the actual delay
1044  * could be anywhere up to twice the requested delay.  This doesn't
1045  * matter, because none of the events are especially time-critical.  The
1046  * ones that matter most all have a delay of 1 ms, so they will be
1047  * handled after 2 ms at most, which is okay.  In addition to this, we
1048  * allow for an expiration range of 1 ms.
1049  */
1050 
1051 /*
1052  * Delay lengths for the hrtimer event types.
1053  * Keep this list sorted by delay length, in the same order as
1054  * the event types indexed by enum fusbh200_hrtimer_event in fusbh200.h.
1055  */
1056 static unsigned event_delays_ns[] = {
1057         1 * NSEC_PER_MSEC,      /* FUSBH200_HRTIMER_POLL_ASS */
1058         1 * NSEC_PER_MSEC,      /* FUSBH200_HRTIMER_POLL_PSS */
1059         1 * NSEC_PER_MSEC,      /* FUSBH200_HRTIMER_POLL_DEAD */
1060         1125 * NSEC_PER_USEC,   /* FUSBH200_HRTIMER_UNLINK_INTR */
1061         2 * NSEC_PER_MSEC,      /* FUSBH200_HRTIMER_FREE_ITDS */
1062         6 * NSEC_PER_MSEC,      /* FUSBH200_HRTIMER_ASYNC_UNLINKS */
1063         10 * NSEC_PER_MSEC,     /* FUSBH200_HRTIMER_IAA_WATCHDOG */
1064         10 * NSEC_PER_MSEC,     /* FUSBH200_HRTIMER_DISABLE_PERIODIC */
1065         15 * NSEC_PER_MSEC,     /* FUSBH200_HRTIMER_DISABLE_ASYNC */
1066         100 * NSEC_PER_MSEC,    /* FUSBH200_HRTIMER_IO_WATCHDOG */
1067 };
1068 
1069 /* Enable a pending hrtimer event */
1070 static void fusbh200_enable_event(struct fusbh200_hcd *fusbh200, unsigned event,
1071                 bool resched)
1072 {
1073         ktime_t         *timeout = &fusbh200->hr_timeouts[event];
1074 
1075         if (resched)
1076                 *timeout = ktime_add(ktime_get(),
1077                                 ktime_set(0, event_delays_ns[event]));
1078         fusbh200->enabled_hrtimer_events |= (1 << event);
1079 
1080         /* Track only the lowest-numbered pending event */
1081         if (event < fusbh200->next_hrtimer_event) {
1082                 fusbh200->next_hrtimer_event = event;
1083                 hrtimer_start_range_ns(&fusbh200->hrtimer, *timeout,
1084                                 NSEC_PER_MSEC, HRTIMER_MODE_ABS);
1085         }
1086 }
1087 
1088 
1089 /* Poll the STS_ASS status bit; see when it agrees with CMD_ASE */
1090 static void fusbh200_poll_ASS(struct fusbh200_hcd *fusbh200)
1091 {
1092         unsigned        actual, want;
1093 
1094         /* Don't enable anything if the controller isn't running (e.g., died) */
1095         if (fusbh200->rh_state != FUSBH200_RH_RUNNING)
1096                 return;
1097 
1098         want = (fusbh200->command & CMD_ASE) ? STS_ASS : 0;
1099         actual = fusbh200_readl(fusbh200, &fusbh200->regs->status) & STS_ASS;
1100 
1101         if (want != actual) {
1102 
1103                 /* Poll again later, but give up after about 20 ms */
1104                 if (fusbh200->ASS_poll_count++ < 20) {
1105                         fusbh200_enable_event(fusbh200, FUSBH200_HRTIMER_POLL_ASS, true);
1106                         return;
1107                 }
1108                 fusbh200_dbg(fusbh200, "Waited too long for the async schedule status (%x/%x), giving up\n",
1109                                 want, actual);
1110         }
1111         fusbh200->ASS_poll_count = 0;
1112 
1113         /* The status is up-to-date; restart or stop the schedule as needed */
1114         if (want == 0) {        /* Stopped */
1115                 if (fusbh200->async_count > 0)
1116                         fusbh200_set_command_bit(fusbh200, CMD_ASE);
1117 
1118         } else {                /* Running */
1119                 if (fusbh200->async_count == 0) {
1120 
1121                         /* Turn off the schedule after a while */
1122                         fusbh200_enable_event(fusbh200, FUSBH200_HRTIMER_DISABLE_ASYNC,
1123                                         true);
1124                 }
1125         }
1126 }
1127 
1128 /* Turn off the async schedule after a brief delay */
1129 static void fusbh200_disable_ASE(struct fusbh200_hcd *fusbh200)
1130 {
1131         fusbh200_clear_command_bit(fusbh200, CMD_ASE);
1132 }
1133 
1134 
1135 /* Poll the STS_PSS status bit; see when it agrees with CMD_PSE */
1136 static void fusbh200_poll_PSS(struct fusbh200_hcd *fusbh200)
1137 {
1138         unsigned        actual, want;
1139 
1140         /* Don't do anything if the controller isn't running (e.g., died) */
1141         if (fusbh200->rh_state != FUSBH200_RH_RUNNING)
1142                 return;
1143 
1144         want = (fusbh200->command & CMD_PSE) ? STS_PSS : 0;
1145         actual = fusbh200_readl(fusbh200, &fusbh200->regs->status) & STS_PSS;
1146 
1147         if (want != actual) {
1148 
1149                 /* Poll again later, but give up after about 20 ms */
1150                 if (fusbh200->PSS_poll_count++ < 20) {
1151                         fusbh200_enable_event(fusbh200, FUSBH200_HRTIMER_POLL_PSS, true);
1152                         return;
1153                 }
1154                 fusbh200_dbg(fusbh200, "Waited too long for the periodic schedule status (%x/%x), giving up\n",
1155                                 want, actual);
1156         }
1157         fusbh200->PSS_poll_count = 0;
1158 
1159         /* The status is up-to-date; restart or stop the schedule as needed */
1160         if (want == 0) {        /* Stopped */
1161                 if (fusbh200->periodic_count > 0)
1162                         fusbh200_set_command_bit(fusbh200, CMD_PSE);
1163 
1164         } else {                /* Running */
1165                 if (fusbh200->periodic_count == 0) {
1166 
1167                         /* Turn off the schedule after a while */
1168                         fusbh200_enable_event(fusbh200, FUSBH200_HRTIMER_DISABLE_PERIODIC,
1169                                         true);
1170                 }
1171         }
1172 }
1173 
1174 /* Turn off the periodic schedule after a brief delay */
1175 static void fusbh200_disable_PSE(struct fusbh200_hcd *fusbh200)
1176 {
1177         fusbh200_clear_command_bit(fusbh200, CMD_PSE);
1178 }
1179 
1180 
1181 /* Poll the STS_HALT status bit; see when a dead controller stops */
1182 static void fusbh200_handle_controller_death(struct fusbh200_hcd *fusbh200)
1183 {
1184         if (!(fusbh200_readl(fusbh200, &fusbh200->regs->status) & STS_HALT)) {
1185 
1186                 /* Give up after a few milliseconds */
1187                 if (fusbh200->died_poll_count++ < 5) {
1188                         /* Try again later */
1189                         fusbh200_enable_event(fusbh200, FUSBH200_HRTIMER_POLL_DEAD, true);
1190                         return;
1191                 }
1192                 fusbh200_warn(fusbh200, "Waited too long for the controller to stop, giving up\n");
1193         }
1194 
1195         /* Clean up the mess */
1196         fusbh200->rh_state = FUSBH200_RH_HALTED;
1197         fusbh200_writel(fusbh200, 0, &fusbh200->regs->intr_enable);
1198         fusbh200_work(fusbh200);
1199         end_unlink_async(fusbh200);
1200 
1201         /* Not in process context, so don't try to reset the controller */
1202 }
1203 
1204 
1205 /* Handle unlinked interrupt QHs once they are gone from the hardware */
1206 static void fusbh200_handle_intr_unlinks(struct fusbh200_hcd *fusbh200)
1207 {
1208         bool            stopped = (fusbh200->rh_state < FUSBH200_RH_RUNNING);
1209 
1210         /*
1211          * Process all the QHs on the intr_unlink list that were added
1212          * before the current unlink cycle began.  The list is in
1213          * temporal order, so stop when we reach the first entry in the
1214          * current cycle.  But if the root hub isn't running then
1215          * process all the QHs on the list.
1216          */
1217         fusbh200->intr_unlinking = true;
1218         while (fusbh200->intr_unlink) {
1219                 struct fusbh200_qh      *qh = fusbh200->intr_unlink;
1220 
1221                 if (!stopped && qh->unlink_cycle == fusbh200->intr_unlink_cycle)
1222                         break;
1223                 fusbh200->intr_unlink = qh->unlink_next;
1224                 qh->unlink_next = NULL;
1225                 end_unlink_intr(fusbh200, qh);
1226         }
1227 
1228         /* Handle remaining entries later */
1229         if (fusbh200->intr_unlink) {
1230                 fusbh200_enable_event(fusbh200, FUSBH200_HRTIMER_UNLINK_INTR, true);
1231                 ++fusbh200->intr_unlink_cycle;
1232         }
1233         fusbh200->intr_unlinking = false;
1234 }
1235 
1236 
1237 /* Start another free-iTDs/siTDs cycle */
1238 static void start_free_itds(struct fusbh200_hcd *fusbh200)
1239 {
1240         if (!(fusbh200->enabled_hrtimer_events & BIT(FUSBH200_HRTIMER_FREE_ITDS))) {
1241                 fusbh200->last_itd_to_free = list_entry(
1242                                 fusbh200->cached_itd_list.prev,
1243                                 struct fusbh200_itd, itd_list);
1244                 fusbh200_enable_event(fusbh200, FUSBH200_HRTIMER_FREE_ITDS, true);
1245         }
1246 }
1247 
1248 /* Wait for controller to stop using old iTDs and siTDs */
1249 static void end_free_itds(struct fusbh200_hcd *fusbh200)
1250 {
1251         struct fusbh200_itd             *itd, *n;
1252 
1253         if (fusbh200->rh_state < FUSBH200_RH_RUNNING) {
1254                 fusbh200->last_itd_to_free = NULL;
1255         }
1256 
1257         list_for_each_entry_safe(itd, n, &fusbh200->cached_itd_list, itd_list) {
1258                 list_del(&itd->itd_list);
1259                 dma_pool_free(fusbh200->itd_pool, itd, itd->itd_dma);
1260                 if (itd == fusbh200->last_itd_to_free)
1261                         break;
1262         }
1263 
1264         if (!list_empty(&fusbh200->cached_itd_list))
1265                 start_free_itds(fusbh200);
1266 }
1267 
1268 
1269 /* Handle lost (or very late) IAA interrupts */
1270 static void fusbh200_iaa_watchdog(struct fusbh200_hcd *fusbh200)
1271 {
1272         if (fusbh200->rh_state != FUSBH200_RH_RUNNING)
1273                 return;
1274 
1275         /*
1276          * Lost IAA irqs wedge things badly; seen first with a vt8235.
1277          * So we need this watchdog, but must protect it against both
1278          * (a) SMP races against real IAA firing and retriggering, and
1279          * (b) clean HC shutdown, when IAA watchdog was pending.
1280          */
1281         if (fusbh200->async_iaa) {
1282                 u32 cmd, status;
1283 
1284                 /* If we get here, IAA is *REALLY* late.  It's barely
1285                  * conceivable that the system is so busy that CMD_IAAD
1286                  * is still legitimately set, so let's be sure it's
1287                  * clear before we read STS_IAA.  (The HC should clear
1288                  * CMD_IAAD when it sets STS_IAA.)
1289                  */
1290                 cmd = fusbh200_readl(fusbh200, &fusbh200->regs->command);
1291 
1292                 /*
1293                  * If IAA is set here it either legitimately triggered
1294                  * after the watchdog timer expired (_way_ late, so we'll
1295                  * still count it as lost) ... or a silicon erratum:
1296                  * - VIA seems to set IAA without triggering the IRQ;
1297                  * - IAAD potentially cleared without setting IAA.
1298                  */
1299                 status = fusbh200_readl(fusbh200, &fusbh200->regs->status);
1300                 if ((status & STS_IAA) || !(cmd & CMD_IAAD)) {
1301                         COUNT(fusbh200->stats.lost_iaa);
1302                         fusbh200_writel(fusbh200, STS_IAA, &fusbh200->regs->status);
1303                 }
1304 
1305                 fusbh200_dbg(fusbh200, "IAA watchdog: status %x cmd %x\n",
1306                                 status, cmd);
1307                 end_unlink_async(fusbh200);
1308         }
1309 }
1310 
1311 
1312 /* Enable the I/O watchdog, if appropriate */
1313 static void turn_on_io_watchdog(struct fusbh200_hcd *fusbh200)
1314 {
1315         /* Not needed if the controller isn't running or it's already enabled */
1316         if (fusbh200->rh_state != FUSBH200_RH_RUNNING ||
1317                         (fusbh200->enabled_hrtimer_events &
1318                                 BIT(FUSBH200_HRTIMER_IO_WATCHDOG)))
1319                 return;
1320 
1321         /*
1322          * Isochronous transfers always need the watchdog.
1323          * For other sorts we use it only if the flag is set.
1324          */
1325         if (fusbh200->isoc_count > 0 || (fusbh200->need_io_watchdog &&
1326                         fusbh200->async_count + fusbh200->intr_count > 0))
1327                 fusbh200_enable_event(fusbh200, FUSBH200_HRTIMER_IO_WATCHDOG, true);
1328 }
1329 
1330 
1331 /*
1332  * Handler functions for the hrtimer event types.
1333  * Keep this array in the same order as the event types indexed by
1334  * enum fusbh200_hrtimer_event in fusbh200.h.
1335  */
1336 static void (*event_handlers[])(struct fusbh200_hcd *) = {
1337         fusbh200_poll_ASS,                      /* FUSBH200_HRTIMER_POLL_ASS */
1338         fusbh200_poll_PSS,                      /* FUSBH200_HRTIMER_POLL_PSS */
1339         fusbh200_handle_controller_death,       /* FUSBH200_HRTIMER_POLL_DEAD */
1340         fusbh200_handle_intr_unlinks,   /* FUSBH200_HRTIMER_UNLINK_INTR */
1341         end_free_itds,                  /* FUSBH200_HRTIMER_FREE_ITDS */
1342         unlink_empty_async,             /* FUSBH200_HRTIMER_ASYNC_UNLINKS */
1343         fusbh200_iaa_watchdog,          /* FUSBH200_HRTIMER_IAA_WATCHDOG */
1344         fusbh200_disable_PSE,           /* FUSBH200_HRTIMER_DISABLE_PERIODIC */
1345         fusbh200_disable_ASE,           /* FUSBH200_HRTIMER_DISABLE_ASYNC */
1346         fusbh200_work,                  /* FUSBH200_HRTIMER_IO_WATCHDOG */
1347 };
1348 
1349 static enum hrtimer_restart fusbh200_hrtimer_func(struct hrtimer *t)
1350 {
1351         struct fusbh200_hcd     *fusbh200 = container_of(t, struct fusbh200_hcd, hrtimer);
1352         ktime_t         now;
1353         unsigned long   events;
1354         unsigned long   flags;
1355         unsigned        e;
1356 
1357         spin_lock_irqsave(&fusbh200->lock, flags);
1358 
1359         events = fusbh200->enabled_hrtimer_events;
1360         fusbh200->enabled_hrtimer_events = 0;
1361         fusbh200->next_hrtimer_event = FUSBH200_HRTIMER_NO_EVENT;
1362 
1363         /*
1364          * Check each pending event.  If its time has expired, handle
1365          * the event; otherwise re-enable it.
1366          */
1367         now = ktime_get();
1368         for_each_set_bit(e, &events, FUSBH200_HRTIMER_NUM_EVENTS) {
1369                 if (now.tv64 >= fusbh200->hr_timeouts[e].tv64)
1370                         event_handlers[e](fusbh200);
1371                 else
1372                         fusbh200_enable_event(fusbh200, e, false);
1373         }
1374 
1375         spin_unlock_irqrestore(&fusbh200->lock, flags);
1376         return HRTIMER_NORESTART;
1377 }
1378 
1379 /*-------------------------------------------------------------------------*/
1380 
1381 #define fusbh200_bus_suspend    NULL
1382 #define fusbh200_bus_resume     NULL
1383 
1384 /*-------------------------------------------------------------------------*/
1385 
1386 static int check_reset_complete (
1387         struct fusbh200_hcd     *fusbh200,
1388         int             index,
1389         u32 __iomem     *status_reg,
1390         int             port_status
1391 ) {
1392         if (!(port_status & PORT_CONNECT))
1393                 return port_status;
1394 
1395         /* if reset finished and it's still not enabled -- handoff */
1396         if (!(port_status & PORT_PE)) {
1397                 /* with integrated TT, there's nobody to hand it to! */
1398                 fusbh200_dbg (fusbh200,
1399                         "Failed to enable port %d on root hub TT\n",
1400                         index+1);
1401                 return port_status;
1402         } else {
1403                 fusbh200_dbg(fusbh200, "port %d reset complete, port enabled\n",
1404                         index + 1);
1405         }
1406 
1407         return port_status;
1408 }
1409 
1410 /*-------------------------------------------------------------------------*/
1411 
1412 
1413 /* build "status change" packet (one or two bytes) from HC registers */
1414 
1415 static int
1416 fusbh200_hub_status_data (struct usb_hcd *hcd, char *buf)
1417 {
1418         struct fusbh200_hcd     *fusbh200 = hcd_to_fusbh200 (hcd);
1419         u32             temp, status;
1420         u32             mask;
1421         int             retval = 1;
1422         unsigned long   flags;
1423 
1424         /* init status to no-changes */
1425         buf [0] = 0;
1426 
1427         /* Inform the core about resumes-in-progress by returning
1428          * a non-zero value even if there are no status changes.
1429          */
1430         status = fusbh200->resuming_ports;
1431 
1432         mask = PORT_CSC | PORT_PEC;
1433         // PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
1434 
1435         /* no hub change reports (bit 0) for now (power, ...) */
1436 
1437         /* port N changes (bit N)? */
1438         spin_lock_irqsave (&fusbh200->lock, flags);
1439 
1440         temp = fusbh200_readl(fusbh200, &fusbh200->regs->port_status);
1441 
1442         /*
1443          * Return status information even for ports with OWNER set.
1444          * Otherwise khubd wouldn't see the disconnect event when a
1445          * high-speed device is switched over to the companion
1446          * controller by the user.
1447          */
1448 
1449         if ((temp & mask) != 0 || test_bit(0, &fusbh200->port_c_suspend)
1450                         || (fusbh200->reset_done[0] && time_after_eq(
1451                                 jiffies, fusbh200->reset_done[0]))) {
1452                 buf [0] |= 1 << 1;
1453                 status = STS_PCD;
1454         }
1455         /* FIXME autosuspend idle root hubs */
1456         spin_unlock_irqrestore (&fusbh200->lock, flags);
1457         return status ? retval : 0;
1458 }
1459 
1460 /*-------------------------------------------------------------------------*/
1461 
1462 static void
1463 fusbh200_hub_descriptor (
1464         struct fusbh200_hcd             *fusbh200,
1465         struct usb_hub_descriptor       *desc
1466 ) {
1467         int             ports = HCS_N_PORTS (fusbh200->hcs_params);
1468         u16             temp;
1469 
1470         desc->bDescriptorType = 0x29;
1471         desc->bPwrOn2PwrGood = 10;      /* fusbh200 1.0, 2.3.9 says 20ms max */
1472         desc->bHubContrCurrent = 0;
1473 
1474         desc->bNbrPorts = ports;
1475         temp = 1 + (ports / 8);
1476         desc->bDescLength = 7 + 2 * temp;
1477 
1478         /* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
1479         memset(&desc->u.hs.DeviceRemovable[0], 0, temp);
1480         memset(&desc->u.hs.DeviceRemovable[temp], 0xff, temp);
1481 
1482         temp = 0x0008;          /* per-port overcurrent reporting */
1483         temp |= 0x0002;         /* no power switching */
1484         desc->wHubCharacteristics = cpu_to_le16(temp);
1485 }
1486 
1487 /*-------------------------------------------------------------------------*/
1488 
1489 static int fusbh200_hub_control (
1490         struct usb_hcd  *hcd,
1491         u16             typeReq,
1492         u16             wValue,
1493         u16             wIndex,
1494         char            *buf,
1495         u16             wLength
1496 ) {
1497         struct fusbh200_hcd     *fusbh200 = hcd_to_fusbh200 (hcd);
1498         int             ports = HCS_N_PORTS (fusbh200->hcs_params);
1499         u32 __iomem     *status_reg = &fusbh200->regs->port_status;
1500         u32             temp, temp1, status;
1501         unsigned long   flags;
1502         int             retval = 0;
1503         unsigned        selector;
1504 
1505         /*
1506          * FIXME:  support SetPortFeatures USB_PORT_FEAT_INDICATOR.
1507          * HCS_INDICATOR may say we can change LEDs to off/amber/green.
1508          * (track current state ourselves) ... blink for diagnostics,
1509          * power, "this is the one", etc.  EHCI spec supports this.
1510          */
1511 
1512         spin_lock_irqsave (&fusbh200->lock, flags);
1513         switch (typeReq) {
1514         case ClearHubFeature:
1515                 switch (wValue) {
1516                 case C_HUB_LOCAL_POWER:
1517                 case C_HUB_OVER_CURRENT:
1518                         /* no hub-wide feature/status flags */
1519                         break;
1520                 default:
1521                         goto error;
1522                 }
1523                 break;
1524         case ClearPortFeature:
1525                 if (!wIndex || wIndex > ports)
1526                         goto error;
1527                 wIndex--;
1528                 temp = fusbh200_readl(fusbh200, status_reg);
1529                 temp &= ~PORT_RWC_BITS;
1530 
1531                 /*
1532                  * Even if OWNER is set, so the port is owned by the
1533                  * companion controller, khubd needs to be able to clear
1534                  * the port-change status bits (especially
1535                  * USB_PORT_STAT_C_CONNECTION).
1536                  */
1537 
1538                 switch (wValue) {
1539                 case USB_PORT_FEAT_ENABLE:
1540                         fusbh200_writel(fusbh200, temp & ~PORT_PE, status_reg);
1541                         break;
1542                 case USB_PORT_FEAT_C_ENABLE:
1543                         fusbh200_writel(fusbh200, temp | PORT_PEC, status_reg);
1544                         break;
1545                 case USB_PORT_FEAT_SUSPEND:
1546                         if (temp & PORT_RESET)
1547                                 goto error;
1548                         if (!(temp & PORT_SUSPEND))
1549                                 break;
1550                         if ((temp & PORT_PE) == 0)
1551                                 goto error;
1552 
1553                         /* resume signaling for 20 msec */
1554                         fusbh200_writel(fusbh200, temp | PORT_RESUME, status_reg);
1555                         fusbh200->reset_done[wIndex] = jiffies
1556                                         + msecs_to_jiffies(20);
1557                         break;
1558                 case USB_PORT_FEAT_C_SUSPEND:
1559                         clear_bit(wIndex, &fusbh200->port_c_suspend);
1560                         break;
1561                 case USB_PORT_FEAT_C_CONNECTION:
1562                         fusbh200_writel(fusbh200, temp | PORT_CSC, status_reg);
1563                         break;
1564                 case USB_PORT_FEAT_C_OVER_CURRENT:
1565                         fusbh200_writel(fusbh200, temp | BMISR_OVC, &fusbh200->regs->bmisr);
1566                         break;
1567                 case USB_PORT_FEAT_C_RESET:
1568                         /* GetPortStatus clears reset */
1569                         break;
1570                 default:
1571                         goto error;
1572                 }
1573                 fusbh200_readl(fusbh200, &fusbh200->regs->command);     /* unblock posted write */
1574                 break;
1575         case GetHubDescriptor:
1576                 fusbh200_hub_descriptor (fusbh200, (struct usb_hub_descriptor *)
1577                         buf);
1578                 break;
1579         case GetHubStatus:
1580                 /* no hub-wide feature/status flags */
1581                 memset (buf, 0, 4);
1582                 //cpu_to_le32s ((u32 *) buf);
1583                 break;
1584         case GetPortStatus:
1585                 if (!wIndex || wIndex > ports)
1586                         goto error;
1587                 wIndex--;
1588                 status = 0;
1589                 temp = fusbh200_readl(fusbh200, status_reg);
1590 
1591                 // wPortChange bits
1592                 if (temp & PORT_CSC)
1593                         status |= USB_PORT_STAT_C_CONNECTION << 16;
1594                 if (temp & PORT_PEC)
1595                         status |= USB_PORT_STAT_C_ENABLE << 16;
1596 
1597                 temp1 = fusbh200_readl(fusbh200, &fusbh200->regs->bmisr);
1598                 if (temp1 & BMISR_OVC)
1599                         status |= USB_PORT_STAT_C_OVERCURRENT << 16;
1600 
1601                 /* whoever resumes must GetPortStatus to complete it!! */
1602                 if (temp & PORT_RESUME) {
1603 
1604                         /* Remote Wakeup received? */
1605                         if (!fusbh200->reset_done[wIndex]) {
1606                                 /* resume signaling for 20 msec */
1607                                 fusbh200->reset_done[wIndex] = jiffies
1608                                                 + msecs_to_jiffies(20);
1609                                 /* check the port again */
1610                                 mod_timer(&fusbh200_to_hcd(fusbh200)->rh_timer,
1611                                                 fusbh200->reset_done[wIndex]);
1612                         }
1613 
1614                         /* resume completed? */
1615                         else if (time_after_eq(jiffies,
1616                                         fusbh200->reset_done[wIndex])) {
1617                                 clear_bit(wIndex, &fusbh200->suspended_ports);
1618                                 set_bit(wIndex, &fusbh200->port_c_suspend);
1619                                 fusbh200->reset_done[wIndex] = 0;
1620 
1621                                 /* stop resume signaling */
1622                                 temp = fusbh200_readl(fusbh200, status_reg);
1623                                 fusbh200_writel(fusbh200,
1624                                         temp & ~(PORT_RWC_BITS | PORT_RESUME),
1625                                         status_reg);
1626                                 clear_bit(wIndex, &fusbh200->resuming_ports);
1627                                 retval = handshake(fusbh200, status_reg,
1628                                            PORT_RESUME, 0, 2000 /* 2msec */);
1629                                 if (retval != 0) {
1630                                         fusbh200_err(fusbh200,
1631                                                 "port %d resume error %d\n",
1632                                                 wIndex + 1, retval);
1633                                         goto error;
1634                                 }
1635                                 temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10));
1636                         }
1637                 }
1638 
1639                 /* whoever resets must GetPortStatus to complete it!! */
1640                 if ((temp & PORT_RESET)
1641                                 && time_after_eq(jiffies,
1642                                         fusbh200->reset_done[wIndex])) {
1643                         status |= USB_PORT_STAT_C_RESET << 16;
1644                         fusbh200->reset_done [wIndex] = 0;
1645                         clear_bit(wIndex, &fusbh200->resuming_ports);
1646 
1647                         /* force reset to complete */
1648                         fusbh200_writel(fusbh200, temp & ~(PORT_RWC_BITS | PORT_RESET),
1649                                         status_reg);
1650                         /* REVISIT:  some hardware needs 550+ usec to clear
1651                          * this bit; seems too long to spin routinely...
1652                          */
1653                         retval = handshake(fusbh200, status_reg,
1654                                         PORT_RESET, 0, 1000);
1655                         if (retval != 0) {
1656                                 fusbh200_err (fusbh200, "port %d reset error %d\n",
1657                                         wIndex + 1, retval);
1658                                 goto error;
1659                         }
1660 
1661                         /* see what we found out */
1662                         temp = check_reset_complete (fusbh200, wIndex, status_reg,
1663                                         fusbh200_readl(fusbh200, status_reg));
1664                 }
1665 
1666                 if (!(temp & (PORT_RESUME|PORT_RESET))) {
1667                         fusbh200->reset_done[wIndex] = 0;
1668                         clear_bit(wIndex, &fusbh200->resuming_ports);
1669                 }
1670 
1671                 /* transfer dedicated ports to the companion hc */
1672                 if ((temp & PORT_CONNECT) &&
1673                                 test_bit(wIndex, &fusbh200->companion_ports)) {
1674                         temp &= ~PORT_RWC_BITS;
1675                         fusbh200_writel(fusbh200, temp, status_reg);
1676                         fusbh200_dbg(fusbh200, "port %d --> companion\n", wIndex + 1);
1677                         temp = fusbh200_readl(fusbh200, status_reg);
1678                 }
1679 
1680                 /*
1681                  * Even if OWNER is set, there's no harm letting khubd
1682                  * see the wPortStatus values (they should all be 0 except
1683                  * for PORT_POWER anyway).
1684                  */
1685 
1686                 if (temp & PORT_CONNECT) {
1687                         status |= USB_PORT_STAT_CONNECTION;
1688                         status |= fusbh200_port_speed(fusbh200, temp);
1689                 }
1690                 if (temp & PORT_PE)
1691                         status |= USB_PORT_STAT_ENABLE;
1692 
1693                 /* maybe the port was unsuspended without our knowledge */
1694                 if (temp & (PORT_SUSPEND|PORT_RESUME)) {
1695                         status |= USB_PORT_STAT_SUSPEND;
1696                 } else if (test_bit(wIndex, &fusbh200->suspended_ports)) {
1697                         clear_bit(wIndex, &fusbh200->suspended_ports);
1698                         clear_bit(wIndex, &fusbh200->resuming_ports);
1699                         fusbh200->reset_done[wIndex] = 0;
1700                         if (temp & PORT_PE)
1701                                 set_bit(wIndex, &fusbh200->port_c_suspend);
1702                 }
1703 
1704                 temp1 = fusbh200_readl(fusbh200, &fusbh200->regs->bmisr);
1705                 if (temp1 & BMISR_OVC)
1706                         status |= USB_PORT_STAT_OVERCURRENT;
1707                 if (temp & PORT_RESET)
1708                         status |= USB_PORT_STAT_RESET;
1709                 if (test_bit(wIndex, &fusbh200->port_c_suspend))
1710                         status |= USB_PORT_STAT_C_SUSPEND << 16;
1711 
1712                 if (status & ~0xffff)   /* only if wPortChange is interesting */
1713                         dbg_port(fusbh200, "GetStatus", wIndex + 1, temp);
1714                 put_unaligned_le32(status, buf);
1715                 break;
1716         case SetHubFeature:
1717                 switch (wValue) {
1718                 case C_HUB_LOCAL_POWER:
1719                 case C_HUB_OVER_CURRENT:
1720                         /* no hub-wide feature/status flags */
1721                         break;
1722                 default:
1723                         goto error;
1724                 }
1725                 break;
1726         case SetPortFeature:
1727                 selector = wIndex >> 8;
1728                 wIndex &= 0xff;
1729 
1730                 if (!wIndex || wIndex > ports)
1731                         goto error;
1732                 wIndex--;
1733                 temp = fusbh200_readl(fusbh200, status_reg);
1734                 temp &= ~PORT_RWC_BITS;
1735                 switch (wValue) {
1736                 case USB_PORT_FEAT_SUSPEND:
1737                         if ((temp & PORT_PE) == 0
1738                                         || (temp & PORT_RESET) != 0)
1739                                 goto error;
1740 
1741                         /* After above check the port must be connected.
1742                          * Set appropriate bit thus could put phy into low power
1743                          * mode if we have hostpc feature
1744                          */
1745                         fusbh200_writel(fusbh200, temp | PORT_SUSPEND, status_reg);
1746                         set_bit(wIndex, &fusbh200->suspended_ports);
1747                         break;
1748                 case USB_PORT_FEAT_RESET:
1749                         if (temp & PORT_RESUME)
1750                                 goto error;
1751                         /* line status bits may report this as low speed,
1752                          * which can be fine if this root hub has a
1753                          * transaction translator built in.
1754                          */
1755                         fusbh200_dbg(fusbh200, "port %d reset\n", wIndex + 1);
1756                         temp |= PORT_RESET;
1757                         temp &= ~PORT_PE;
1758 
1759                         /*
1760                          * caller must wait, then call GetPortStatus
1761                          * usb 2.0 spec says 50 ms resets on root
1762                          */
1763                         fusbh200->reset_done [wIndex] = jiffies
1764                                         + msecs_to_jiffies (50);
1765                         fusbh200_writel(fusbh200, temp, status_reg);
1766                         break;
1767 
1768                 /* For downstream facing ports (these):  one hub port is put
1769                  * into test mode according to USB2 11.24.2.13, then the hub
1770                  * must be reset (which for root hub now means rmmod+modprobe,
1771                  * or else system reboot).  See EHCI 2.3.9 and 4.14 for info
1772                  * about the EHCI-specific stuff.
1773                  */
1774                 case USB_PORT_FEAT_TEST:
1775                         if (!selector || selector > 5)
1776                                 goto error;
1777                         spin_unlock_irqrestore(&fusbh200->lock, flags);
1778                         fusbh200_quiesce(fusbh200);
1779                         spin_lock_irqsave(&fusbh200->lock, flags);
1780 
1781                         /* Put all enabled ports into suspend */
1782                         temp = fusbh200_readl(fusbh200, status_reg) & ~PORT_RWC_BITS;
1783                         if (temp & PORT_PE)
1784                                 fusbh200_writel(fusbh200, temp | PORT_SUSPEND,
1785                                                 status_reg);
1786 
1787                         spin_unlock_irqrestore(&fusbh200->lock, flags);
1788                         fusbh200_halt(fusbh200);
1789                         spin_lock_irqsave(&fusbh200->lock, flags);
1790 
1791                         temp = fusbh200_readl(fusbh200, status_reg);
1792                         temp |= selector << 16;
1793                         fusbh200_writel(fusbh200, temp, status_reg);
1794                         break;
1795 
1796                 default:
1797                         goto error;
1798                 }
1799                 fusbh200_readl(fusbh200, &fusbh200->regs->command);     /* unblock posted writes */
1800                 break;
1801 
1802         default:
1803 error:
1804                 /* "stall" on error */
1805                 retval = -EPIPE;
1806         }
1807         spin_unlock_irqrestore (&fusbh200->lock, flags);
1808         return retval;
1809 }
1810 
1811 static void __maybe_unused fusbh200_relinquish_port(struct usb_hcd *hcd,
1812                 int portnum)
1813 {
1814         return;
1815 }
1816 
1817 static int __maybe_unused fusbh200_port_handed_over(struct usb_hcd *hcd,
1818                 int portnum)
1819 {
1820         return 0;
1821 }
1822 /*-------------------------------------------------------------------------*/
1823 /*
1824  * There's basically three types of memory:
1825  *      - data used only by the HCD ... kmalloc is fine
1826  *      - async and periodic schedules, shared by HC and HCD ... these
1827  *        need to use dma_pool or dma_alloc_coherent
1828  *      - driver buffers, read/written by HC ... single shot DMA mapped
1829  *
1830  * There's also "register" data (e.g. PCI or SOC), which is memory mapped.
1831  * No memory seen by this driver is pageable.
1832  */
1833 
1834 /*-------------------------------------------------------------------------*/
1835 
1836 /* Allocate the key transfer structures from the previously allocated pool */
1837 
1838 static inline void fusbh200_qtd_init(struct fusbh200_hcd *fusbh200, struct fusbh200_qtd *qtd,
1839                                   dma_addr_t dma)
1840 {
1841         memset (qtd, 0, sizeof *qtd);
1842         qtd->qtd_dma = dma;
1843         qtd->hw_token = cpu_to_hc32(fusbh200, QTD_STS_HALT);
1844         qtd->hw_next = FUSBH200_LIST_END(fusbh200);
1845         qtd->hw_alt_next = FUSBH200_LIST_END(fusbh200);
1846         INIT_LIST_HEAD (&qtd->qtd_list);
1847 }
1848 
1849 static struct fusbh200_qtd *fusbh200_qtd_alloc (struct fusbh200_hcd *fusbh200, gfp_t flags)
1850 {
1851         struct fusbh200_qtd             *qtd;
1852         dma_addr_t              dma;
1853 
1854         qtd = dma_pool_alloc (fusbh200->qtd_pool, flags, &dma);
1855         if (qtd != NULL) {
1856                 fusbh200_qtd_init(fusbh200, qtd, dma);
1857         }
1858         return qtd;
1859 }
1860 
1861 static inline void fusbh200_qtd_free (struct fusbh200_hcd *fusbh200, struct fusbh200_qtd *qtd)
1862 {
1863         dma_pool_free (fusbh200->qtd_pool, qtd, qtd->qtd_dma);
1864 }
1865 
1866 
1867 static void qh_destroy(struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh)
1868 {
1869         /* clean qtds first, and know this is not linked */
1870         if (!list_empty (&qh->qtd_list) || qh->qh_next.ptr) {
1871                 fusbh200_dbg (fusbh200, "unused qh not empty!\n");
1872                 BUG ();
1873         }
1874         if (qh->dummy)
1875                 fusbh200_qtd_free (fusbh200, qh->dummy);
1876         dma_pool_free(fusbh200->qh_pool, qh->hw, qh->qh_dma);
1877         kfree(qh);
1878 }
1879 
1880 static struct fusbh200_qh *fusbh200_qh_alloc (struct fusbh200_hcd *fusbh200, gfp_t flags)
1881 {
1882         struct fusbh200_qh              *qh;
1883         dma_addr_t              dma;
1884 
1885         qh = kzalloc(sizeof *qh, GFP_ATOMIC);
1886         if (!qh)
1887                 goto done;
1888         qh->hw = (struct fusbh200_qh_hw *)
1889                 dma_pool_alloc(fusbh200->qh_pool, flags, &dma);
1890         if (!qh->hw)
1891                 goto fail;
1892         memset(qh->hw, 0, sizeof *qh->hw);
1893         qh->qh_dma = dma;
1894         // INIT_LIST_HEAD (&qh->qh_list);
1895         INIT_LIST_HEAD (&qh->qtd_list);
1896 
1897         /* dummy td enables safe urb queuing */
1898         qh->dummy = fusbh200_qtd_alloc (fusbh200, flags);
1899         if (qh->dummy == NULL) {
1900                 fusbh200_dbg (fusbh200, "no dummy td\n");
1901                 goto fail1;
1902         }
1903 done:
1904         return qh;
1905 fail1:
1906         dma_pool_free(fusbh200->qh_pool, qh->hw, qh->qh_dma);
1907 fail:
1908         kfree(qh);
1909         return NULL;
1910 }
1911 
1912 /*-------------------------------------------------------------------------*/
1913 
1914 /* The queue heads and transfer descriptors are managed from pools tied
1915  * to each of the "per device" structures.
1916  * This is the initialisation and cleanup code.
1917  */
1918 
1919 static void fusbh200_mem_cleanup (struct fusbh200_hcd *fusbh200)
1920 {
1921         if (fusbh200->async)
1922                 qh_destroy(fusbh200, fusbh200->async);
1923         fusbh200->async = NULL;
1924 
1925         if (fusbh200->dummy)
1926                 qh_destroy(fusbh200, fusbh200->dummy);
1927         fusbh200->dummy = NULL;
1928 
1929         /* DMA consistent memory and pools */
1930         if (fusbh200->qtd_pool)
1931                 dma_pool_destroy (fusbh200->qtd_pool);
1932         fusbh200->qtd_pool = NULL;
1933 
1934         if (fusbh200->qh_pool) {
1935                 dma_pool_destroy (fusbh200->qh_pool);
1936                 fusbh200->qh_pool = NULL;
1937         }
1938 
1939         if (fusbh200->itd_pool)
1940                 dma_pool_destroy (fusbh200->itd_pool);
1941         fusbh200->itd_pool = NULL;
1942 
1943         if (fusbh200->periodic)
1944                 dma_free_coherent (fusbh200_to_hcd(fusbh200)->self.controller,
1945                         fusbh200->periodic_size * sizeof (u32),
1946                         fusbh200->periodic, fusbh200->periodic_dma);
1947         fusbh200->periodic = NULL;
1948 
1949         /* shadow periodic table */
1950         kfree(fusbh200->pshadow);
1951         fusbh200->pshadow = NULL;
1952 }
1953 
1954 /* remember to add cleanup code (above) if you add anything here */
1955 static int fusbh200_mem_init (struct fusbh200_hcd *fusbh200, gfp_t flags)
1956 {
1957         int i;
1958 
1959         /* QTDs for control/bulk/intr transfers */
1960         fusbh200->qtd_pool = dma_pool_create ("fusbh200_qtd",
1961                         fusbh200_to_hcd(fusbh200)->self.controller,
1962                         sizeof (struct fusbh200_qtd),
1963                         32 /* byte alignment (for hw parts) */,
1964                         4096 /* can't cross 4K */);
1965         if (!fusbh200->qtd_pool) {
1966                 goto fail;
1967         }
1968 
1969         /* QHs for control/bulk/intr transfers */
1970         fusbh200->qh_pool = dma_pool_create ("fusbh200_qh",
1971                         fusbh200_to_hcd(fusbh200)->self.controller,
1972                         sizeof(struct fusbh200_qh_hw),
1973                         32 /* byte alignment (for hw parts) */,
1974                         4096 /* can't cross 4K */);
1975         if (!fusbh200->qh_pool) {
1976                 goto fail;
1977         }
1978         fusbh200->async = fusbh200_qh_alloc (fusbh200, flags);
1979         if (!fusbh200->async) {
1980                 goto fail;
1981         }
1982 
1983         /* ITD for high speed ISO transfers */
1984         fusbh200->itd_pool = dma_pool_create ("fusbh200_itd",
1985                         fusbh200_to_hcd(fusbh200)->self.controller,
1986                         sizeof (struct fusbh200_itd),
1987                         64 /* byte alignment (for hw parts) */,
1988                         4096 /* can't cross 4K */);
1989         if (!fusbh200->itd_pool) {
1990                 goto fail;
1991         }
1992 
1993         /* Hardware periodic table */
1994         fusbh200->periodic = (__le32 *)
1995                 dma_alloc_coherent (fusbh200_to_hcd(fusbh200)->self.controller,
1996                         fusbh200->periodic_size * sizeof(__le32),
1997                         &fusbh200->periodic_dma, 0);
1998         if (fusbh200->periodic == NULL) {
1999                 goto fail;
2000         }
2001 
2002                 for (i = 0; i < fusbh200->periodic_size; i++)
2003                         fusbh200->periodic[i] = FUSBH200_LIST_END(fusbh200);
2004 
2005         /* software shadow of hardware table */
2006         fusbh200->pshadow = kcalloc(fusbh200->periodic_size, sizeof(void *), flags);
2007         if (fusbh200->pshadow != NULL)
2008                 return 0;
2009 
2010 fail:
2011         fusbh200_dbg (fusbh200, "couldn't init memory\n");
2012         fusbh200_mem_cleanup (fusbh200);
2013         return -ENOMEM;
2014 }
2015 /*-------------------------------------------------------------------------*/
2016 /*
2017  * EHCI hardware queue manipulation ... the core.  QH/QTD manipulation.
2018  *
2019  * Control, bulk, and interrupt traffic all use "qh" lists.  They list "qtd"
2020  * entries describing USB transactions, max 16-20kB/entry (with 4kB-aligned
2021  * buffers needed for the larger number).  We use one QH per endpoint, queue
2022  * multiple urbs (all three types) per endpoint.  URBs may need several qtds.
2023  *
2024  * ISO traffic uses "ISO TD" (itd) records, and (along with
2025  * interrupts) needs careful scheduling.  Performance improvements can be
2026  * an ongoing challenge.  That's in "ehci-sched.c".
2027  *
2028  * USB 1.1 devices are handled (a) by "companion" OHCI or UHCI root hubs,
2029  * or otherwise through transaction translators (TTs) in USB 2.0 hubs using
2030  * (b) special fields in qh entries or (c) split iso entries.  TTs will
2031  * buffer low/full speed data so the host collects it at high speed.
2032  */
2033 
2034 /*-------------------------------------------------------------------------*/
2035 
2036 /* fill a qtd, returning how much of the buffer we were able to queue up */
2037 
2038 static int
2039 qtd_fill(struct fusbh200_hcd *fusbh200, struct fusbh200_qtd *qtd, dma_addr_t buf,
2040                   size_t len, int token, int maxpacket)
2041 {
2042         int     i, count;
2043         u64     addr = buf;
2044 
2045         /* one buffer entry per 4K ... first might be short or unaligned */
2046         qtd->hw_buf[0] = cpu_to_hc32(fusbh200, (u32)addr);
2047         qtd->hw_buf_hi[0] = cpu_to_hc32(fusbh200, (u32)(addr >> 32));
2048         count = 0x1000 - (buf & 0x0fff);        /* rest of that page */
2049         if (likely (len < count))               /* ... iff needed */
2050                 count = len;
2051         else {
2052                 buf +=  0x1000;
2053                 buf &= ~0x0fff;
2054 
2055                 /* per-qtd limit: from 16K to 20K (best alignment) */
2056                 for (i = 1; count < len && i < 5; i++) {
2057                         addr = buf;
2058                         qtd->hw_buf[i] = cpu_to_hc32(fusbh200, (u32)addr);
2059                         qtd->hw_buf_hi[i] = cpu_to_hc32(fusbh200,
2060                                         (u32)(addr >> 32));
2061                         buf += 0x1000;
2062                         if ((count + 0x1000) < len)
2063                                 count += 0x1000;
2064                         else
2065                                 count = len;
2066                 }
2067 
2068                 /* short packets may only terminate transfers */
2069                 if (count != len)
2070                         count -= (count % maxpacket);
2071         }
2072         qtd->hw_token = cpu_to_hc32(fusbh200, (count << 16) | token);
2073         qtd->length = count;
2074 
2075         return count;
2076 }
2077 
2078 /*-------------------------------------------------------------------------*/
2079 
2080 static inline void
2081 qh_update (struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh, struct fusbh200_qtd *qtd)
2082 {
2083         struct fusbh200_qh_hw *hw = qh->hw;
2084 
2085         /* writes to an active overlay are unsafe */
2086         BUG_ON(qh->qh_state != QH_STATE_IDLE);
2087 
2088         hw->hw_qtd_next = QTD_NEXT(fusbh200, qtd->qtd_dma);
2089         hw->hw_alt_next = FUSBH200_LIST_END(fusbh200);
2090 
2091         /* Except for control endpoints, we make hardware maintain data
2092          * toggle (like OHCI) ... here (re)initialize the toggle in the QH,
2093          * and set the pseudo-toggle in udev. Only usb_clear_halt() will
2094          * ever clear it.
2095          */
2096         if (!(hw->hw_info1 & cpu_to_hc32(fusbh200, QH_TOGGLE_CTL))) {
2097                 unsigned        is_out, epnum;
2098 
2099                 is_out = qh->is_out;
2100                 epnum = (hc32_to_cpup(fusbh200, &hw->hw_info1) >> 8) & 0x0f;
2101                 if (unlikely (!usb_gettoggle (qh->dev, epnum, is_out))) {
2102                         hw->hw_token &= ~cpu_to_hc32(fusbh200, QTD_TOGGLE);
2103                         usb_settoggle (qh->dev, epnum, is_out, 1);
2104                 }
2105         }
2106 
2107         hw->hw_token &= cpu_to_hc32(fusbh200, QTD_TOGGLE | QTD_STS_PING);
2108 }
2109 
2110 /* if it weren't for a common silicon quirk (writing the dummy into the qh
2111  * overlay, so qh->hw_token wrongly becomes inactive/halted), only fault
2112  * recovery (including urb dequeue) would need software changes to a QH...
2113  */
2114 static void
2115 qh_refresh (struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh)
2116 {
2117         struct fusbh200_qtd *qtd;
2118 
2119         if (list_empty (&qh->qtd_list))
2120                 qtd = qh->dummy;
2121         else {
2122                 qtd = list_entry (qh->qtd_list.next,
2123                                 struct fusbh200_qtd, qtd_list);
2124                 /*
2125                  * first qtd may already be partially processed.
2126                  * If we come here during unlink, the QH overlay region
2127                  * might have reference to the just unlinked qtd. The
2128                  * qtd is updated in qh_completions(). Update the QH
2129                  * overlay here.
2130                  */
2131                 if (cpu_to_hc32(fusbh200, qtd->qtd_dma) == qh->hw->hw_current) {
2132                         qh->hw->hw_qtd_next = qtd->hw_next;
2133                         qtd = NULL;
2134                 }
2135         }
2136 
2137         if (qtd)
2138                 qh_update (fusbh200, qh, qtd);
2139 }
2140 
2141 /*-------------------------------------------------------------------------*/
2142 
2143 static void qh_link_async(struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh);
2144 
2145 static void fusbh200_clear_tt_buffer_complete(struct usb_hcd *hcd,
2146                 struct usb_host_endpoint *ep)
2147 {
2148         struct fusbh200_hcd             *fusbh200 = hcd_to_fusbh200(hcd);
2149         struct fusbh200_qh              *qh = ep->hcpriv;
2150         unsigned long           flags;
2151 
2152         spin_lock_irqsave(&fusbh200->lock, flags);
2153         qh->clearing_tt = 0;
2154         if (qh->qh_state == QH_STATE_IDLE && !list_empty(&qh->qtd_list)
2155                         && fusbh200->rh_state == FUSBH200_RH_RUNNING)
2156                 qh_link_async(fusbh200, qh);
2157         spin_unlock_irqrestore(&fusbh200->lock, flags);
2158 }
2159 
2160 static void fusbh200_clear_tt_buffer(struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh,
2161                 struct urb *urb, u32 token)
2162 {
2163 
2164         /* If an async split transaction gets an error or is unlinked,
2165          * the TT buffer may be left in an indeterminate state.  We
2166          * have to clear the TT buffer.
2167          *
2168          * Note: this routine is never called for Isochronous transfers.
2169          */
2170         if (urb->dev->tt && !usb_pipeint(urb->pipe) && !qh->clearing_tt) {
2171                 struct usb_device *tt = urb->dev->tt->hub;
2172 
2173                 dev_dbg(&tt->dev,
2174                         "clear tt buffer port %d, a%d ep%d t%08x\n",
2175                         urb->dev->ttport, urb->dev->devnum,
2176                         usb_pipeendpoint(urb->pipe), token);
2177 
2178                 if (urb->dev->tt->hub !=
2179                     fusbh200_to_hcd(fusbh200)->self.root_hub) {
2180                         if (usb_hub_clear_tt_buffer(urb) == 0)
2181                                 qh->clearing_tt = 1;
2182                 }
2183         }
2184 }
2185 
2186 static int qtd_copy_status (
2187         struct fusbh200_hcd *fusbh200,
2188         struct urb *urb,
2189         size_t length,
2190         u32 token
2191 )
2192 {
2193         int     status = -EINPROGRESS;
2194 
2195         /* count IN/OUT bytes, not SETUP (even short packets) */
2196         if (likely (QTD_PID (token) != 2))
2197                 urb->actual_length += length - QTD_LENGTH (token);
2198 
2199         /* don't modify error codes */
2200         if (unlikely(urb->unlinked))
2201                 return status;
2202 
2203         /* force cleanup after short read; not always an error */
2204         if (unlikely (IS_SHORT_READ (token)))
2205                 status = -EREMOTEIO;
2206 
2207         /* serious "can't proceed" faults reported by the hardware */
2208         if (token & QTD_STS_HALT) {
2209                 if (token & QTD_STS_BABBLE) {
2210                         /* FIXME "must" disable babbling device's port too */
2211                         status = -EOVERFLOW;
2212                 /* CERR nonzero + halt --> stall */
2213                 } else if (QTD_CERR(token)) {
2214                         status = -EPIPE;
2215 
2216                 /* In theory, more than one of the following bits can be set
2217                  * since they are sticky and the transaction is retried.
2218                  * Which to test first is rather arbitrary.
2219                  */
2220                 } else if (token & QTD_STS_MMF) {
2221                         /* fs/ls interrupt xfer missed the complete-split */
2222                         status = -EPROTO;
2223                 } else if (token & QTD_STS_DBE) {
2224                         status = (QTD_PID (token) == 1) /* IN ? */
2225                                 ? -ENOSR  /* hc couldn't read data */
2226                                 : -ECOMM; /* hc couldn't write data */
2227                 } else if (token & QTD_STS_XACT) {
2228                         /* timeout, bad CRC, wrong PID, etc */
2229                         fusbh200_dbg(fusbh200, "devpath %s ep%d%s 3strikes\n",
2230                                 urb->dev->devpath,
2231                                 usb_pipeendpoint(urb->pipe),
2232                                 usb_pipein(urb->pipe) ? "in" : "out");
2233                         status = -EPROTO;
2234                 } else {        /* unknown */
2235                         status = -EPROTO;
2236                 }
2237 
2238                 fusbh200_dbg(fusbh200,
2239                         "dev%d ep%d%s qtd token %08x --> status %d\n",
2240                         usb_pipedevice (urb->pipe),
2241                         usb_pipeendpoint (urb->pipe),
2242                         usb_pipein (urb->pipe) ? "in" : "out",
2243                         token, status);
2244         }
2245 
2246         return status;
2247 }
2248 
2249 static void
2250 fusbh200_urb_done(struct fusbh200_hcd *fusbh200, struct urb *urb, int status)
2251 __releases(fusbh200->lock)
2252 __acquires(fusbh200->lock)
2253 {
2254         if (likely (urb->hcpriv != NULL)) {
2255                 struct fusbh200_qh      *qh = (struct fusbh200_qh *) urb->hcpriv;
2256 
2257                 /* S-mask in a QH means it's an interrupt urb */
2258                 if ((qh->hw->hw_info2 & cpu_to_hc32(fusbh200, QH_SMASK)) != 0) {
2259 
2260                         /* ... update hc-wide periodic stats (for usbfs) */
2261                         fusbh200_to_hcd(fusbh200)->self.bandwidth_int_reqs--;
2262                 }
2263         }
2264 
2265         if (unlikely(urb->unlinked)) {
2266                 COUNT(fusbh200->stats.unlink);
2267         } else {
2268                 /* report non-error and short read status as zero */
2269                 if (status == -EINPROGRESS || status == -EREMOTEIO)
2270                         status = 0;
2271                 COUNT(fusbh200->stats.complete);
2272         }
2273 
2274 #ifdef FUSBH200_URB_TRACE
2275         fusbh200_dbg (fusbh200,
2276                 "%s %s urb %p ep%d%s status %d len %d/%d\n",
2277                 __func__, urb->dev->devpath, urb,
2278                 usb_pipeendpoint (urb->pipe),
2279                 usb_pipein (urb->pipe) ? "in" : "out",
2280                 status,
2281                 urb->actual_length, urb->transfer_buffer_length);
2282 #endif
2283 
2284         /* complete() can reenter this HCD */
2285         usb_hcd_unlink_urb_from_ep(fusbh200_to_hcd(fusbh200), urb);
2286         spin_unlock (&fusbh200->lock);
2287         usb_hcd_giveback_urb(fusbh200_to_hcd(fusbh200), urb, status);
2288         spin_lock (&fusbh200->lock);
2289 }
2290 
2291 static int qh_schedule (struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh);
2292 
2293 /*
2294  * Process and free completed qtds for a qh, returning URBs to drivers.
2295  * Chases up to qh->hw_current.  Returns number of completions called,
2296  * indicating how much "real" work we did.
2297  */
2298 static unsigned
2299 qh_completions (struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh)
2300 {
2301         struct fusbh200_qtd             *last, *end = qh->dummy;
2302         struct list_head        *entry, *tmp;
2303         int                     last_status;
2304         int                     stopped;
2305         unsigned                count = 0;
2306         u8                      state;
2307         struct fusbh200_qh_hw   *hw = qh->hw;
2308 
2309         if (unlikely (list_empty (&qh->qtd_list)))
2310                 return count;
2311 
2312         /* completions (or tasks on other cpus) must never clobber HALT
2313          * till we've gone through and cleaned everything up, even when
2314          * they add urbs to this qh's queue or mark them for unlinking.
2315          *
2316          * NOTE:  unlinking expects to be done in queue order.
2317          *
2318          * It's a bug for qh->qh_state to be anything other than
2319          * QH_STATE_IDLE, unless our caller is scan_async() or
2320          * scan_intr().
2321          */
2322         state = qh->qh_state;
2323         qh->qh_state = QH_STATE_COMPLETING;
2324         stopped = (state == QH_STATE_IDLE);
2325 
2326  rescan:
2327         last = NULL;
2328         last_status = -EINPROGRESS;
2329         qh->needs_rescan = 0;
2330 
2331         /* remove de-activated QTDs from front of queue.
2332          * after faults (including short reads), cleanup this urb
2333          * then let the queue advance.
2334          * if queue is stopped, handles unlinks.
2335          */
2336         list_for_each_safe (entry, tmp, &qh->qtd_list) {
2337                 struct fusbh200_qtd     *qtd;
2338                 struct urb      *urb;
2339                 u32             token = 0;
2340 
2341                 qtd = list_entry (entry, struct fusbh200_qtd, qtd_list);
2342                 urb = qtd->urb;
2343 
2344                 /* clean up any state from previous QTD ...*/
2345                 if (last) {
2346                         if (likely (last->urb != urb)) {
2347                                 fusbh200_urb_done(fusbh200, last->urb, last_status);
2348                                 count++;
2349                                 last_status = -EINPROGRESS;
2350                         }
2351                         fusbh200_qtd_free (fusbh200, last);
2352                         last = NULL;
2353                 }
2354 
2355                 /* ignore urbs submitted during completions we reported */
2356                 if (qtd == end)
2357                         break;
2358 
2359                 /* hardware copies qtd out of qh overlay */
2360                 rmb ();
2361                 token = hc32_to_cpu(fusbh200, qtd->hw_token);
2362 
2363                 /* always clean up qtds the hc de-activated */
2364  retry_xacterr:
2365                 if ((token & QTD_STS_ACTIVE) == 0) {
2366 
2367                         /* Report Data Buffer Error: non-fatal but useful */
2368                         if (token & QTD_STS_DBE)
2369                                 fusbh200_dbg(fusbh200,
2370                                         "detected DataBufferErr for urb %p ep%d%s len %d, qtd %p [qh %p]\n",
2371                                         urb,
2372                                         usb_endpoint_num(&urb->ep->desc),
2373                                         usb_endpoint_dir_in(&urb->ep->desc) ? "in" : "out",
2374                                         urb->transfer_buffer_length,
2375                                         qtd,
2376                                         qh);
2377 
2378                         /* on STALL, error, and short reads this urb must
2379                          * complete and all its qtds must be recycled.
2380                          */
2381                         if ((token & QTD_STS_HALT) != 0) {
2382 
2383                                 /* retry transaction errors until we
2384                                  * reach the software xacterr limit
2385                                  */
2386                                 if ((token & QTD_STS_XACT) &&
2387                                                 QTD_CERR(token) == 0 &&
2388                                                 ++qh->xacterrs < QH_XACTERR_MAX &&
2389                                                 !urb->unlinked) {
2390                                         fusbh200_dbg(fusbh200,
2391         "detected XactErr len %zu/%zu retry %d\n",
2392         qtd->length - QTD_LENGTH(token), qtd->length, qh->xacterrs);
2393 
2394                                         /* reset the token in the qtd and the
2395                                          * qh overlay (which still contains
2396                                          * the qtd) so that we pick up from
2397                                          * where we left off
2398                                          */
2399                                         token &= ~QTD_STS_HALT;
2400                                         token |= QTD_STS_ACTIVE |
2401                                                         (FUSBH200_TUNE_CERR << 10);
2402                                         qtd->hw_token = cpu_to_hc32(fusbh200,
2403                                                         token);
2404                                         wmb();
2405                                         hw->hw_token = cpu_to_hc32(fusbh200,
2406                                                         token);
2407                                         goto retry_xacterr;
2408                                 }
2409                                 stopped = 1;
2410 
2411                         /* magic dummy for some short reads; qh won't advance.
2412                          * that silicon quirk can kick in with this dummy too.
2413                          *
2414                          * other short reads won't stop the queue, including
2415                          * control transfers (status stage handles that) or
2416                          * most other single-qtd reads ... the queue stops if
2417                          * URB_SHORT_NOT_OK was set so the driver submitting
2418                          * the urbs could clean it up.
2419                          */
2420                         } else if (IS_SHORT_READ (token)
2421                                         && !(qtd->hw_alt_next
2422                                                 & FUSBH200_LIST_END(fusbh200))) {
2423                                 stopped = 1;
2424                         }
2425 
2426                 /* stop scanning when we reach qtds the hc is using */
2427                 } else if (likely (!stopped
2428                                 && fusbh200->rh_state >= FUSBH200_RH_RUNNING)) {
2429                         break;
2430 
2431                 /* scan the whole queue for unlinks whenever it stops */
2432                 } else {
2433                         stopped = 1;
2434 
2435                         /* cancel everything if we halt, suspend, etc */
2436                         if (fusbh200->rh_state < FUSBH200_RH_RUNNING)
2437                                 last_status = -ESHUTDOWN;
2438 
2439                         /* this qtd is active; skip it unless a previous qtd
2440                          * for its urb faulted, or its urb was canceled.
2441                          */
2442                         else if (last_status == -EINPROGRESS && !urb->unlinked)
2443                                 continue;
2444 
2445                         /* qh unlinked; token in overlay may be most current */
2446                         if (state == QH_STATE_IDLE
2447                                         && cpu_to_hc32(fusbh200, qtd->qtd_dma)
2448                                                 == hw->hw_current) {
2449                                 token = hc32_to_cpu(fusbh200, hw->hw_token);
2450 
2451                                 /* An unlink may leave an incomplete
2452                                  * async transaction in the TT buffer.
2453                                  * We have to clear it.
2454                                  */
2455                                 fusbh200_clear_tt_buffer(fusbh200, qh, urb, token);
2456                         }
2457                 }
2458 
2459                 /* unless we already know the urb's status, collect qtd status
2460                  * and update count of bytes transferred.  in common short read
2461                  * cases with only one data qtd (including control transfers),
2462                  * queue processing won't halt.  but with two or more qtds (for
2463                  * example, with a 32 KB transfer), when the first qtd gets a
2464                  * short read the second must be removed by hand.
2465                  */
2466                 if (last_status == -EINPROGRESS) {
2467                         last_status = qtd_copy_status(fusbh200, urb,
2468                                         qtd->length, token);
2469                         if (last_status == -EREMOTEIO
2470                                         && (qtd->hw_alt_next
2471                                                 & FUSBH200_LIST_END(fusbh200)))
2472                                 last_status = -EINPROGRESS;
2473 
2474                         /* As part of low/full-speed endpoint-halt processing
2475                          * we must clear the TT buffer (11.17.5).
2476                          */
2477                         if (unlikely(last_status != -EINPROGRESS &&
2478                                         last_status != -EREMOTEIO)) {
2479                                 /* The TT's in some hubs malfunction when they
2480                                  * receive this request following a STALL (they
2481                                  * stop sending isochronous packets).  Since a
2482                                  * STALL can't leave the TT buffer in a busy
2483                                  * state (if you believe Figures 11-48 - 11-51
2484                                  * in the USB 2.0 spec), we won't clear the TT
2485                                  * buffer in this case.  Strictly speaking this
2486                                  * is a violation of the spec.
2487                                  */
2488                                 if (last_status != -EPIPE)
2489                                         fusbh200_clear_tt_buffer(fusbh200, qh, urb,
2490                                                         token);
2491                         }
2492                 }
2493 
2494                 /* if we're removing something not at the queue head,
2495                  * patch the hardware queue pointer.
2496                  */
2497                 if (stopped && qtd->qtd_list.prev != &qh->qtd_list) {
2498                         last = list_entry (qtd->qtd_list.prev,
2499                                         struct fusbh200_qtd, qtd_list);
2500                         last->hw_next = qtd->hw_next;
2501                 }
2502 
2503                 /* remove qtd; it's recycled after possible urb completion */
2504                 list_del (&qtd->qtd_list);
2505                 last = qtd;
2506 
2507                 /* reinit the xacterr counter for the next qtd */
2508                 qh->xacterrs = 0;
2509         }
2510 
2511         /* last urb's completion might still need calling */
2512         if (likely (last != NULL)) {
2513                 fusbh200_urb_done(fusbh200, last->urb, last_status);
2514                 count++;
2515                 fusbh200_qtd_free (fusbh200, last);
2516         }
2517 
2518         /* Do we need to rescan for URBs dequeued during a giveback? */
2519         if (unlikely(qh->needs_rescan)) {
2520                 /* If the QH is already unlinked, do the rescan now. */
2521                 if (state == QH_STATE_IDLE)
2522                         goto rescan;
2523 
2524                 /* Otherwise we have to wait until the QH is fully unlinked.
2525                  * Our caller will start an unlink if qh->needs_rescan is
2526                  * set.  But if an unlink has already started, nothing needs
2527                  * to be done.
2528                  */
2529                 if (state != QH_STATE_LINKED)
2530                         qh->needs_rescan = 0;
2531         }
2532 
2533         /* restore original state; caller must unlink or relink */
2534         qh->qh_state = state;
2535 
2536         /* be sure the hardware's done with the qh before refreshing
2537          * it after fault cleanup, or recovering from silicon wrongly
2538          * overlaying the dummy qtd (which reduces DMA chatter).
2539          */
2540         if (stopped != 0 || hw->hw_qtd_next == FUSBH200_LIST_END(fusbh200)) {
2541                 switch (state) {
2542                 case QH_STATE_IDLE:
2543                         qh_refresh(fusbh200, qh);
2544                         break;
2545                 case QH_STATE_LINKED:
2546                         /* We won't refresh a QH that's linked (after the HC
2547                          * stopped the queue).  That avoids a race:
2548                          *  - HC reads first part of QH;
2549                          *  - CPU updates that first part and the token;
2550                          *  - HC reads rest of that QH, including token
2551                          * Result:  HC gets an inconsistent image, and then
2552                          * DMAs to/from the wrong memory (corrupting it).
2553                          *
2554                          * That should be rare for interrupt transfers,
2555                          * except maybe high bandwidth ...
2556                          */
2557 
2558                         /* Tell the caller to start an unlink */
2559                         qh->needs_rescan = 1;
2560                         break;
2561                 /* otherwise, unlink already started */
2562                 }
2563         }
2564 
2565         return count;
2566 }
2567 
2568 /*-------------------------------------------------------------------------*/
2569 
2570 // high bandwidth multiplier, as encoded in highspeed endpoint descriptors
2571 #define hb_mult(wMaxPacketSize) (1 + (((wMaxPacketSize) >> 11) & 0x03))
2572 // ... and packet size, for any kind of endpoint descriptor
2573 #define max_packet(wMaxPacketSize) ((wMaxPacketSize) & 0x07ff)
2574 
2575 /*
2576  * reverse of qh_urb_transaction:  free a list of TDs.
2577  * used for cleanup after errors, before HC sees an URB's TDs.
2578  */
2579 static void qtd_list_free (
2580         struct fusbh200_hcd             *fusbh200,
2581         struct urb              *urb,
2582         struct list_head        *qtd_list
2583 ) {
2584         struct list_head        *entry, *temp;
2585 
2586         list_for_each_safe (entry, temp, qtd_list) {
2587                 struct fusbh200_qtd     *qtd;
2588 
2589                 qtd = list_entry (entry, struct fusbh200_qtd, qtd_list);
2590                 list_del (&qtd->qtd_list);
2591                 fusbh200_qtd_free (fusbh200, qtd);
2592         }
2593 }
2594 
2595 /*
2596  * create a list of filled qtds for this URB; won't link into qh.
2597  */
2598 static struct list_head *
2599 qh_urb_transaction (
2600         struct fusbh200_hcd             *fusbh200,
2601         struct urb              *urb,
2602         struct list_head        *head,
2603         gfp_t                   flags
2604 ) {
2605         struct fusbh200_qtd             *qtd, *qtd_prev;
2606         dma_addr_t              buf;
2607         int                     len, this_sg_len, maxpacket;
2608         int                     is_input;
2609         u32                     token;
2610         int                     i;
2611         struct scatterlist      *sg;
2612 
2613         /*
2614          * URBs map to sequences of QTDs:  one logical transaction
2615          */
2616         qtd = fusbh200_qtd_alloc (fusbh200, flags);
2617         if (unlikely (!qtd))
2618                 return NULL;
2619         list_add_tail (&qtd->qtd_list, head);
2620         qtd->urb = urb;
2621 
2622         token = QTD_STS_ACTIVE;
2623         token |= (FUSBH200_TUNE_CERR << 10);
2624         /* for split transactions, SplitXState initialized to zero */
2625 
2626         len = urb->transfer_buffer_length;
2627         is_input = usb_pipein (urb->pipe);
2628         if (usb_pipecontrol (urb->pipe)) {
2629                 /* SETUP pid */
2630                 qtd_fill(fusbh200, qtd, urb->setup_dma,
2631                                 sizeof (struct usb_ctrlrequest),
2632                                 token | (2 /* "setup" */ << 8), 8);
2633 
2634                 /* ... and always at least one more pid */
2635                 token ^= QTD_TOGGLE;
2636                 qtd_prev = qtd;
2637                 qtd = fusbh200_qtd_alloc (fusbh200, flags);
2638                 if (unlikely (!qtd))
2639                         goto cleanup;
2640                 qtd->urb = urb;
2641                 qtd_prev->hw_next = QTD_NEXT(fusbh200, qtd->qtd_dma);
2642                 list_add_tail (&qtd->qtd_list, head);
2643 
2644                 /* for zero length DATA stages, STATUS is always IN */
2645                 if (len == 0)
2646                         token |= (1 /* "in" */ << 8);
2647         }
2648 
2649         /*
2650          * data transfer stage:  buffer setup
2651          */
2652         i = urb->num_mapped_sgs;
2653         if (len > 0 && i > 0) {
2654                 sg = urb->sg;
2655                 buf = sg_dma_address(sg);
2656 
2657                 /* urb->transfer_buffer_length may be smaller than the
2658                  * size of the scatterlist (or vice versa)
2659                  */
2660                 this_sg_len = min_t(int, sg_dma_len(sg), len);
2661         } else {
2662                 sg = NULL;
2663                 buf = urb->transfer_dma;
2664                 this_sg_len = len;
2665         }
2666 
2667         if (is_input)
2668                 token |= (1 /* "in" */ << 8);
2669         /* else it's already initted to "out" pid (0 << 8) */
2670 
2671         maxpacket = max_packet(usb_maxpacket(urb->dev, urb->pipe, !is_input));
2672 
2673         /*
2674          * buffer gets wrapped in one or more qtds;
2675          * last one may be "short" (including zero len)
2676          * and may serve as a control status ack
2677          */
2678         for (;;) {
2679                 int this_qtd_len;
2680 
2681                 this_qtd_len = qtd_fill(fusbh200, qtd, buf, this_sg_len, token,
2682                                 maxpacket);
2683                 this_sg_len -= this_qtd_len;
2684                 len -= this_qtd_len;
2685                 buf += this_qtd_len;
2686 
2687                 /*
2688                  * short reads advance to a "magic" dummy instead of the next
2689                  * qtd ... that forces the queue to stop, for manual cleanup.
2690                  * (this will usually be overridden later.)
2691                  */
2692                 if (is_input)
2693                         qtd->hw_alt_next = fusbh200->async->hw->hw_alt_next;
2694 
2695                 /* qh makes control packets use qtd toggle; maybe switch it */
2696                 if ((maxpacket & (this_qtd_len + (maxpacket - 1))) == 0)
2697                         token ^= QTD_TOGGLE;
2698 
2699                 if (likely(this_sg_len <= 0)) {
2700                         if (--i <= 0 || len <= 0)
2701                                 break;
2702                         sg = sg_next(sg);
2703                         buf = sg_dma_address(sg);
2704                         this_sg_len = min_t(int, sg_dma_len(sg), len);
2705                 }
2706 
2707                 qtd_prev = qtd;
2708                 qtd = fusbh200_qtd_alloc (fusbh200, flags);
2709                 if (unlikely (!qtd))
2710                         goto cleanup;
2711                 qtd->urb = urb;
2712                 qtd_prev->hw_next = QTD_NEXT(fusbh200, qtd->qtd_dma);
2713                 list_add_tail (&qtd->qtd_list, head);
2714         }
2715 
2716         /*
2717          * unless the caller requires manual cleanup after short reads,
2718          * have the alt_next mechanism keep the queue running after the
2719          * last data qtd (the only one, for control and most other cases).
2720          */
2721         if (likely ((urb->transfer_flags & URB_SHORT_NOT_OK) == 0
2722                                 || usb_pipecontrol (urb->pipe)))
2723                 qtd->hw_alt_next = FUSBH200_LIST_END(fusbh200);
2724 
2725         /*
2726          * control requests may need a terminating data "status" ack;
2727          * other OUT ones may need a terminating short packet
2728          * (zero length).
2729          */
2730         if (likely (urb->transfer_buffer_length != 0)) {
2731                 int     one_more = 0;
2732 
2733                 if (usb_pipecontrol (urb->pipe)) {
2734                         one_more = 1;
2735                         token ^= 0x0100;        /* "in" <--> "out"  */
2736                         token |= QTD_TOGGLE;    /* force DATA1 */
2737                 } else if (usb_pipeout(urb->pipe)
2738                                 && (urb->transfer_flags & URB_ZERO_PACKET)
2739                                 && !(urb->transfer_buffer_length % maxpacket)) {
2740                         one_more = 1;
2741                 }
2742                 if (one_more) {
2743                         qtd_prev = qtd;
2744                         qtd = fusbh200_qtd_alloc (fusbh200, flags);
2745                         if (unlikely (!qtd))
2746                                 goto cleanup;
2747                         qtd->urb = urb;
2748                         qtd_prev->hw_next = QTD_NEXT(fusbh200, qtd->qtd_dma);
2749                         list_add_tail (&qtd->qtd_list, head);
2750 
2751                         /* never any data in such packets */
2752                         qtd_fill(fusbh200, qtd, 0, 0, token, 0);
2753                 }
2754         }
2755 
2756         /* by default, enable interrupt on urb completion */
2757         if (likely (!(urb->transfer_flags & URB_NO_INTERRUPT)))
2758                 qtd->hw_token |= cpu_to_hc32(fusbh200, QTD_IOC);
2759         return head;
2760 
2761 cleanup:
2762         qtd_list_free (fusbh200, urb, head);
2763         return NULL;
2764 }
2765 
2766 /*-------------------------------------------------------------------------*/
2767 
2768 // Would be best to create all qh's from config descriptors,
2769 // when each interface/altsetting is established.  Unlink
2770 // any previous qh and cancel its urbs first; endpoints are
2771 // implicitly reset then (data toggle too).
2772 // That'd mean updating how usbcore talks to HCDs. (2.7?)
2773 
2774 
2775 /*
2776  * Each QH holds a qtd list; a QH is used for everything except iso.
2777  *
2778  * For interrupt urbs, the scheduler must set the microframe scheduling
2779  * mask(s) each time the QH gets scheduled.  For highspeed, that's
2780  * just one microframe in the s-mask.  For split interrupt transactions
2781  * there are additional complications: c-mask, maybe FSTNs.
2782  */
2783 static struct fusbh200_qh *
2784 qh_make (
2785         struct fusbh200_hcd             *fusbh200,
2786         struct urb              *urb,
2787         gfp_t                   flags
2788 ) {
2789         struct fusbh200_qh              *qh = fusbh200_qh_alloc (fusbh200, flags);
2790         u32                     info1 = 0, info2 = 0;
2791         int                     is_input, type;
2792         int                     maxp = 0;
2793         struct usb_tt           *tt = urb->dev->tt;
2794         struct fusbh200_qh_hw   *hw;
2795 
2796         if (!qh)
2797                 return qh;
2798 
2799         /*
2800          * init endpoint/device data for this QH
2801          */
2802         info1 |= usb_pipeendpoint (urb->pipe) << 8;
2803         info1 |= usb_pipedevice (urb->pipe) << 0;
2804 
2805         is_input = usb_pipein (urb->pipe);
2806         type = usb_pipetype (urb->pipe);
2807         maxp = usb_maxpacket (urb->dev, urb->pipe, !is_input);
2808 
2809         /* 1024 byte maxpacket is a hardware ceiling.  High bandwidth
2810          * acts like up to 3KB, but is built from smaller packets.
2811          */
2812         if (max_packet(maxp) > 1024) {
2813                 fusbh200_dbg(fusbh200, "bogus qh maxpacket %d\n", max_packet(maxp));
2814                 goto done;
2815         }
2816 
2817         /* Compute interrupt scheduling parameters just once, and save.
2818          * - allowing for high bandwidth, how many nsec/uframe are used?
2819          * - split transactions need a second CSPLIT uframe; same question
2820          * - splits also need a schedule gap (for full/low speed I/O)
2821          * - qh has a polling interval
2822          *
2823          * For control/bulk requests, the HC or TT handles these.
2824          */
2825         if (type == PIPE_INTERRUPT) {
2826                 qh->usecs = NS_TO_US(usb_calc_bus_time(USB_SPEED_HIGH,
2827                                 is_input, 0,
2828                                 hb_mult(maxp) * max_packet(maxp)));
2829                 qh->start = NO_FRAME;
2830 
2831                 if (urb->dev->speed == USB_SPEED_HIGH) {
2832                         qh->c_usecs = 0;
2833                         qh->gap_uf = 0;
2834 
2835                         qh->period = urb->interval >> 3;
2836                         if (qh->period == 0 && urb->interval != 1) {
2837                                 /* NOTE interval 2 or 4 uframes could work.
2838                                  * But interval 1 scheduling is simpler, and
2839                                  * includes high bandwidth.
2840                                  */
2841                                 urb->interval = 1;
2842                         } else if (qh->period > fusbh200->periodic_size) {
2843                                 qh->period = fusbh200->periodic_size;
2844                                 urb->interval = qh->period << 3;
2845                         }
2846                 } else {
2847                         int             think_time;
2848 
2849                         /* gap is f(FS/LS transfer times) */
2850                         qh->gap_uf = 1 + usb_calc_bus_time (urb->dev->speed,
2851                                         is_input, 0, maxp) / (125 * 1000);
2852 
2853                         /* FIXME this just approximates SPLIT/CSPLIT times */
2854                         if (is_input) {         // SPLIT, gap, CSPLIT+DATA
2855                                 qh->c_usecs = qh->usecs + HS_USECS (0);
2856                                 qh->usecs = HS_USECS (1);
2857                         } else {                // SPLIT+DATA, gap, CSPLIT
2858                                 qh->usecs += HS_USECS (1);
2859                                 qh->c_usecs = HS_USECS (0);
2860                         }
2861 
2862                         think_time = tt ? tt->think_time : 0;
2863                         qh->tt_usecs = NS_TO_US (think_time +
2864                                         usb_calc_bus_time (urb->dev->speed,
2865                                         is_input, 0, max_packet (maxp)));
2866                         qh->period = urb->interval;
2867                         if (qh->period > fusbh200->periodic_size) {
2868                                 qh->period = fusbh200->periodic_size;
2869                                 urb->interval = qh->period;
2870                         }
2871                 }
2872         }
2873 
2874         /* support for tt scheduling, and access to toggles */
2875         qh->dev = urb->dev;
2876 
2877         /* using TT? */
2878         switch (urb->dev->speed) {
2879         case USB_SPEED_LOW:
2880                 info1 |= QH_LOW_SPEED;
2881                 /* FALL THROUGH */
2882 
2883         case USB_SPEED_FULL:
2884                 /* EPS 0 means "full" */
2885                 if (type != PIPE_INTERRUPT)
2886                         info1 |= (FUSBH200_TUNE_RL_TT << 28);
2887                 if (type == PIPE_CONTROL) {
2888                         info1 |= QH_CONTROL_EP;         /* for TT */
2889                         info1 |= QH_TOGGLE_CTL;         /* toggle from qtd */
2890                 }
2891                 info1 |= maxp << 16;
2892 
2893                 info2 |= (FUSBH200_TUNE_MULT_TT << 30);
2894 
2895                 /* Some Freescale processors have an erratum in which the
2896                  * port number in the queue head was 0..N-1 instead of 1..N.
2897                  */
2898                 if (fusbh200_has_fsl_portno_bug(fusbh200))
2899                         info2 |= (urb->dev->ttport-1) << 23;
2900                 else
2901                         info2 |= urb->dev->ttport << 23;
2902 
2903                 /* set the address of the TT; for TDI's integrated
2904                  * root hub tt, leave it zeroed.
2905                  */
2906                 if (tt && tt->hub != fusbh200_to_hcd(fusbh200)->self.root_hub)
2907                         info2 |= tt->hub->devnum << 16;
2908 
2909                 /* NOTE:  if (PIPE_INTERRUPT) { scheduler sets c-mask } */
2910 
2911                 break;
2912 
2913         case USB_SPEED_HIGH:            /* no TT involved */
2914                 info1 |= QH_HIGH_SPEED;
2915                 if (type == PIPE_CONTROL) {
2916                         info1 |= (FUSBH200_TUNE_RL_HS << 28);
2917                         info1 |= 64 << 16;      /* usb2 fixed maxpacket */
2918                         info1 |= QH_TOGGLE_CTL; /* toggle from qtd */
2919                         info2 |= (FUSBH200_TUNE_MULT_HS << 30);
2920                 } else if (type == PIPE_BULK) {
2921                         info1 |= (FUSBH200_TUNE_RL_HS << 28);
2922                         /* The USB spec says that high speed bulk endpoints
2923                          * always use 512 byte maxpacket.  But some device
2924                          * vendors decided to ignore that, and MSFT is happy
2925                          * to help them do so.  So now people expect to use
2926                          * such nonconformant devices with Linux too; sigh.
2927                          */
2928                         info1 |= max_packet(maxp) << 16;
2929                         info2 |= (FUSBH200_TUNE_MULT_HS << 30);
2930                 } else {                /* PIPE_INTERRUPT */
2931                         info1 |= max_packet (maxp) << 16;
2932                         info2 |= hb_mult (maxp) << 30;
2933                 }
2934                 break;
2935         default:
2936                 fusbh200_dbg(fusbh200, "bogus dev %p speed %d\n", urb->dev,
2937                         urb->dev->speed);
2938 done:
2939                 qh_destroy(fusbh200, qh);
2940                 return NULL;
2941         }
2942 
2943         /* NOTE:  if (PIPE_INTERRUPT) { scheduler sets s-mask } */
2944 
2945         /* init as live, toggle clear, advance to dummy */
2946         qh->qh_state = QH_STATE_IDLE;
2947         hw = qh->hw;
2948         hw->hw_info1 = cpu_to_hc32(fusbh200, info1);
2949         hw->hw_info2 = cpu_to_hc32(fusbh200, info2);
2950         qh->is_out = !is_input;
2951         usb_settoggle (urb->dev, usb_pipeendpoint (urb->pipe), !is_input, 1);
2952         qh_refresh (fusbh200, qh);
2953         return qh;
2954 }
2955 
2956 /*-------------------------------------------------------------------------*/
2957 
2958 static void enable_async(struct fusbh200_hcd *fusbh200)
2959 {
2960         if (fusbh200->async_count++)
2961                 return;
2962 
2963         /* Stop waiting to turn off the async schedule */
2964         fusbh200->enabled_hrtimer_events &= ~BIT(FUSBH200_HRTIMER_DISABLE_ASYNC);
2965 
2966         /* Don't start the schedule until ASS is 0 */
2967         fusbh200_poll_ASS(fusbh200);
2968         turn_on_io_watchdog(fusbh200);
2969 }
2970 
2971 static void disable_async(struct fusbh200_hcd *fusbh200)
2972 {
2973         if (--fusbh200->async_count)
2974                 return;
2975 
2976         /* The async schedule and async_unlink list are supposed to be empty */
2977         WARN_ON(fusbh200->async->qh_next.qh || fusbh200->async_unlink);
2978 
2979         /* Don't turn off the schedule until ASS is 1 */
2980         fusbh200_poll_ASS(fusbh200);
2981 }
2982 
2983 /* move qh (and its qtds) onto async queue; maybe enable queue.  */
2984 
2985 static void qh_link_async (struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh)
2986 {
2987         __hc32          dma = QH_NEXT(fusbh200, qh->qh_dma);
2988         struct fusbh200_qh      *head;
2989 
2990         /* Don't link a QH if there's a Clear-TT-Buffer pending */
2991         if (unlikely(qh->clearing_tt))
2992                 return;
2993 
2994         WARN_ON(qh->qh_state != QH_STATE_IDLE);
2995 
2996         /* clear halt and/or toggle; and maybe recover from silicon quirk */
2997         qh_refresh(fusbh200, qh);
2998 
2999         /* splice right after start */
3000         head = fusbh200->async;
3001         qh->qh_next = head->qh_next;
3002         qh->hw->hw_next = head->hw->hw_next;
3003         wmb ();
3004 
3005         head->qh_next.qh = qh;
3006         head->hw->hw_next = dma;
3007 
3008         qh->xacterrs = 0;
3009         qh->qh_state = QH_STATE_LINKED;
3010         /* qtd completions reported later by interrupt */
3011 
3012         enable_async(fusbh200);
3013 }
3014 
3015 /*-------------------------------------------------------------------------*/
3016 
3017 /*
3018  * For control/bulk/interrupt, return QH with these TDs appended.
3019  * Allocates and initializes the QH if necessary.
3020  * Returns null if it can't allocate a QH it needs to.
3021  * If the QH has TDs (urbs) already, that's great.
3022  */
3023 static struct fusbh200_qh *qh_append_tds (
3024         struct fusbh200_hcd             *fusbh200,
3025         struct urb              *urb,
3026         struct list_head        *qtd_list,
3027         int                     epnum,
3028         void                    **ptr
3029 )
3030 {
3031         struct fusbh200_qh              *qh = NULL;
3032         __hc32                  qh_addr_mask = cpu_to_hc32(fusbh200, 0x7f);
3033 
3034         qh = (struct fusbh200_qh *) *ptr;
3035         if (unlikely (qh == NULL)) {
3036                 /* can't sleep here, we have fusbh200->lock... */
3037                 qh = qh_make (fusbh200, urb, GFP_ATOMIC);
3038                 *ptr = qh;
3039         }
3040         if (likely (qh != NULL)) {
3041                 struct fusbh200_qtd     *qtd;
3042 
3043                 if (unlikely (list_empty (qtd_list)))
3044                         qtd = NULL;
3045                 else
3046                         qtd = list_entry (qtd_list->next, struct fusbh200_qtd,
3047                                         qtd_list);
3048 
3049                 /* control qh may need patching ... */
3050                 if (unlikely (epnum == 0)) {
3051 
3052                         /* usb_reset_device() briefly reverts to address 0 */
3053                         if (usb_pipedevice (urb->pipe) == 0)
3054                                 qh->hw->hw_info1 &= ~qh_addr_mask;
3055                 }
3056 
3057                 /* just one way to queue requests: swap with the dummy qtd.
3058                  * only hc or qh_refresh() ever modify the overlay.
3059                  */
3060                 if (likely (qtd != NULL)) {
3061                         struct fusbh200_qtd             *dummy;
3062                         dma_addr_t              dma;
3063                         __hc32                  token;
3064 
3065                         /* to avoid racing the HC, use the dummy td instead of
3066                          * the first td of our list (becomes new dummy).  both
3067                          * tds stay deactivated until we're done, when the
3068                          * HC is allowed to fetch the old dummy (4.10.2).
3069                          */
3070                         token = qtd->hw_token;
3071                         qtd->hw_token = HALT_BIT(fusbh200);
3072 
3073                         dummy = qh->dummy;
3074 
3075                         dma = dummy->qtd_dma;
3076                         *dummy = *qtd;
3077                         dummy->qtd_dma = dma;
3078 
3079                         list_del (&qtd->qtd_list);
3080                         list_add (&dummy->qtd_list, qtd_list);
3081                         list_splice_tail(qtd_list, &qh->qtd_list);
3082 
3083                         fusbh200_qtd_init(fusbh200, qtd, qtd->qtd_dma);
3084                         qh->dummy = qtd;
3085 
3086                         /* hc must see the new dummy at list end */
3087                         dma = qtd->qtd_dma;
3088                         qtd = list_entry (qh->qtd_list.prev,
3089                                         struct fusbh200_qtd, qtd_list);
3090                         qtd->hw_next = QTD_NEXT(fusbh200, dma);
3091 
3092                         /* let the hc process these next qtds */
3093                         wmb ();
3094                         dummy->hw_token = token;
3095 
3096                         urb->hcpriv = qh;
3097                 }
3098         }
3099         return qh;
3100 }
3101 
3102 /*-------------------------------------------------------------------------*/
3103 
3104 static int
3105 submit_async (
3106         struct fusbh200_hcd             *fusbh200,
3107         struct urb              *urb,
3108         struct list_head        *qtd_list,
3109         gfp_t                   mem_flags
3110 ) {
3111         int                     epnum;
3112         unsigned long           flags;
3113         struct fusbh200_qh              *qh = NULL;
3114         int                     rc;
3115 
3116         epnum = urb->ep->desc.bEndpointAddress;
3117 
3118 #ifdef FUSBH200_URB_TRACE
3119         {
3120                 struct fusbh200_qtd *qtd;
3121                 qtd = list_entry(qtd_list->next, struct fusbh200_qtd, qtd_list);
3122                 fusbh200_dbg(fusbh200,
3123                          "%s %s urb %p ep%d%s len %d, qtd %p [qh %p]\n",
3124                          __func__, urb->dev->devpath, urb,
3125                          epnum & 0x0f, (epnum & USB_DIR_IN) ? "in" : "out",
3126                          urb->transfer_buffer_length,
3127                          qtd, urb->ep->hcpriv);
3128         }
3129 #endif
3130 
3131         spin_lock_irqsave (&fusbh200->lock, flags);
3132         if (unlikely(!HCD_HW_ACCESSIBLE(fusbh200_to_hcd(fusbh200)))) {
3133                 rc = -ESHUTDOWN;
3134                 goto done;
3135         }
3136         rc = usb_hcd_link_urb_to_ep(fusbh200_to_hcd(fusbh200), urb);
3137         if (unlikely(rc))
3138                 goto done;
3139 
3140         qh = qh_append_tds(fusbh200, urb, qtd_list, epnum, &urb->ep->hcpriv);
3141         if (unlikely(qh == NULL)) {
3142                 usb_hcd_unlink_urb_from_ep(fusbh200_to_hcd(fusbh200), urb);
3143                 rc = -ENOMEM;
3144                 goto done;
3145         }
3146 
3147         /* Control/bulk operations through TTs don't need scheduling,
3148          * the HC and TT handle it when the TT has a buffer ready.
3149          */
3150         if (likely (qh->qh_state == QH_STATE_IDLE))
3151                 qh_link_async(fusbh200, qh);
3152  done:
3153         spin_unlock_irqrestore (&fusbh200->lock, flags);
3154         if (unlikely (qh == NULL))
3155                 qtd_list_free (fusbh200, urb, qtd_list);
3156         return rc;
3157 }
3158 
3159 /*-------------------------------------------------------------------------*/
3160 
3161 static void single_unlink_async(struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh)
3162 {
3163         struct fusbh200_qh              *prev;
3164 
3165         /* Add to the end of the list of QHs waiting for the next IAAD */
3166         qh->qh_state = QH_STATE_UNLINK;
3167         if (fusbh200->async_unlink)
3168                 fusbh200->async_unlink_last->unlink_next = qh;
3169         else
3170                 fusbh200->async_unlink = qh;
3171         fusbh200->async_unlink_last = qh;
3172 
3173         /* Unlink it from the schedule */
3174         prev = fusbh200->async;
3175         while (prev->qh_next.qh != qh)
3176                 prev = prev->qh_next.qh;
3177 
3178         prev->hw->hw_next = qh->hw->hw_next;
3179         prev->qh_next = qh->qh_next;
3180         if (fusbh200->qh_scan_next == qh)
3181                 fusbh200->qh_scan_next = qh->qh_next.qh;
3182 }
3183 
3184 static void start_iaa_cycle(struct fusbh200_hcd *fusbh200, bool nested)
3185 {
3186         /*
3187          * Do nothing if an IAA cycle is already running or
3188          * if one will be started shortly.
3189          */
3190         if (fusbh200->async_iaa || fusbh200->async_unlinking)
3191                 return;
3192 
3193         /* Do all the waiting QHs at once */
3194         fusbh200->async_iaa = fusbh200->async_unlink;
3195         fusbh200->async_unlink = NULL;
3196 
3197         /* If the controller isn't running, we don't have to wait for it */
3198         if (unlikely(fusbh200->rh_state < FUSBH200_RH_RUNNING)) {
3199                 if (!nested)            /* Avoid recursion */
3200                         end_unlink_async(fusbh200);
3201 
3202         /* Otherwise start a new IAA cycle */
3203         } else if (likely(fusbh200->rh_state == FUSBH200_RH_RUNNING)) {
3204                 /* Make sure the unlinks are all visible to the hardware */
3205                 wmb();
3206 
3207                 fusbh200_writel(fusbh200, fusbh200->command | CMD_IAAD,
3208                                 &fusbh200->regs->command);
3209                 fusbh200_readl(fusbh200, &fusbh200->regs->command);
3210                 fusbh200_enable_event(fusbh200, FUSBH200_HRTIMER_IAA_WATCHDOG, true);
3211         }
3212 }
3213 
3214 /* the async qh for the qtds being unlinked are now gone from the HC */
3215 
3216 static void end_unlink_async(struct fusbh200_hcd *fusbh200)
3217 {
3218         struct fusbh200_qh              *qh;
3219 
3220         /* Process the idle QHs */
3221  restart:
3222         fusbh200->async_unlinking = true;
3223         while (fusbh200->async_iaa) {
3224                 qh = fusbh200->async_iaa;
3225                 fusbh200->async_iaa = qh->unlink_next;
3226                 qh->unlink_next = NULL;
3227 
3228                 qh->qh_state = QH_STATE_IDLE;
3229                 qh->qh_next.qh = NULL;
3230 
3231                 qh_completions(fusbh200, qh);
3232                 if (!list_empty(&qh->qtd_list) &&
3233                                 fusbh200->rh_state == FUSBH200_RH_RUNNING)
3234                         qh_link_async(fusbh200, qh);
3235                 disable_async(fusbh200);
3236         }
3237         fusbh200->async_unlinking = false;
3238 
3239         /* Start a new IAA cycle if any QHs are waiting for it */
3240         if (fusbh200->async_unlink) {
3241                 start_iaa_cycle(fusbh200, true);
3242                 if (unlikely(fusbh200->rh_state < FUSBH200_RH_RUNNING))
3243                         goto restart;
3244         }
3245 }
3246 
3247 static void unlink_empty_async(struct fusbh200_hcd *fusbh200)
3248 {
3249         struct fusbh200_qh              *qh, *next;
3250         bool                    stopped = (fusbh200->rh_state < FUSBH200_RH_RUNNING);
3251         bool                    check_unlinks_later = false;
3252 
3253         /* Unlink all the async QHs that have been empty for a timer cycle */
3254         next = fusbh200->async->qh_next.qh;
3255         while (next) {
3256                 qh = next;
3257                 next = qh->qh_next.qh;
3258 
3259                 if (list_empty(&qh->qtd_list) &&
3260                                 qh->qh_state == QH_STATE_LINKED) {
3261                         if (!stopped && qh->unlink_cycle ==
3262                                         fusbh200->async_unlink_cycle)
3263                                 check_unlinks_later = true;
3264                         else
3265                                 single_unlink_async(fusbh200, qh);
3266                 }
3267         }
3268 
3269         /* Start a new IAA cycle if any QHs are waiting for it */
3270         if (fusbh200->async_unlink)
3271                 start_iaa_cycle(fusbh200, false);
3272 
3273         /* QHs that haven't been empty for long enough will be handled later */
3274         if (check_unlinks_later) {
3275                 fusbh200_enable_event(fusbh200, FUSBH200_HRTIMER_ASYNC_UNLINKS, true);
3276                 ++fusbh200->async_unlink_cycle;
3277         }
3278 }
3279 
3280 /* makes sure the async qh will become idle */
3281 /* caller must own fusbh200->lock */
3282 
3283 static void start_unlink_async(struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh)
3284 {
3285         /*
3286          * If the QH isn't linked then there's nothing we can do
3287          * unless we were called during a giveback, in which case
3288          * qh_completions() has to deal with it.
3289          */
3290         if (qh->qh_state != QH_STATE_LINKED) {
3291                 if (qh->qh_state == QH_STATE_COMPLETING)
3292                         qh->needs_rescan = 1;
3293                 return;
3294         }
3295 
3296         single_unlink_async(fusbh200, qh);
3297         start_iaa_cycle(fusbh200, false);
3298 }
3299 
3300 /*-------------------------------------------------------------------------*/
3301 
3302 static void scan_async (struct fusbh200_hcd *fusbh200)
3303 {
3304         struct fusbh200_qh              *qh;
3305         bool                    check_unlinks_later = false;
3306 
3307         fusbh200->qh_scan_next = fusbh200->async->qh_next.qh;
3308         while (fusbh200->qh_scan_next) {
3309                 qh = fusbh200->qh_scan_next;
3310                 fusbh200->qh_scan_next = qh->qh_next.qh;
3311  rescan:
3312                 /* clean any finished work for this qh */
3313                 if (!list_empty(&qh->qtd_list)) {
3314                         int temp;
3315 
3316                         /*
3317                          * Unlinks could happen here; completion reporting
3318                          * drops the lock.  That's why fusbh200->qh_scan_next
3319                          * always holds the next qh to scan; if the next qh
3320                          * gets unlinked then fusbh200->qh_scan_next is adjusted
3321                          * in single_unlink_async().
3322                          */
3323                         temp = qh_completions(fusbh200, qh);
3324                         if (qh->needs_rescan) {
3325                                 start_unlink_async(fusbh200, qh);
3326                         } else if (list_empty(&qh->qtd_list)
3327                                         && qh->qh_state == QH_STATE_LINKED) {
3328                                 qh->unlink_cycle = fusbh200->async_unlink_cycle;
3329                                 check_unlinks_later = true;
3330                         } else if (temp != 0)
3331                                 goto rescan;
3332                 }
3333         }
3334 
3335         /*
3336          * Unlink empty entries, reducing DMA usage as well
3337          * as HCD schedule-scanning costs.  Delay for any qh
3338          * we just scanned, there's a not-unusual case that it
3339          * doesn't stay idle for long.
3340          */
3341         if (check_unlinks_later && fusbh200->rh_state == FUSBH200_RH_RUNNING &&
3342                         !(fusbh200->enabled_hrtimer_events &
3343                                 BIT(FUSBH200_HRTIMER_ASYNC_UNLINKS))) {
3344                 fusbh200_enable_event(fusbh200, FUSBH200_HRTIMER_ASYNC_UNLINKS, true);
3345                 ++fusbh200->async_unlink_cycle;
3346         }
3347 }
3348 /*-------------------------------------------------------------------------*/
3349 /*
3350  * EHCI scheduled transaction support:  interrupt, iso, split iso
3351  * These are called "periodic" transactions in the EHCI spec.
3352  *
3353  * Note that for interrupt transfers, the QH/QTD manipulation is shared
3354  * with the "asynchronous" transaction support (control/bulk transfers).
3355  * The only real difference is in how interrupt transfers are scheduled.
3356  *
3357  * For ISO, we make an "iso_stream" head to serve the same role as a QH.
3358  * It keeps track of every ITD (or SITD) that's linked, and holds enough
3359  * pre-calculated schedule data to make appending to the queue be quick.
3360  */
3361 
3362 static int fusbh200_get_frame (struct usb_hcd *hcd);
3363 
3364 /*-------------------------------------------------------------------------*/
3365 
3366 /*
3367  * periodic_next_shadow - return "next" pointer on shadow list
3368  * @periodic: host pointer to qh/itd
3369  * @tag: hardware tag for type of this record
3370  */
3371 static union fusbh200_shadow *
3372 periodic_next_shadow(struct fusbh200_hcd *fusbh200, union fusbh200_shadow *periodic,
3373                 __hc32 tag)
3374 {
3375         switch (hc32_to_cpu(fusbh200, tag)) {
3376         case Q_TYPE_QH:
3377                 return &periodic->qh->qh_next;
3378         case Q_TYPE_FSTN:
3379                 return &periodic->fstn->fstn_next;
3380         default:
3381                 return &periodic->itd->itd_next;
3382         }
3383 }
3384 
3385 static __hc32 *
3386 shadow_next_periodic(struct fusbh200_hcd *fusbh200, union fusbh200_shadow *periodic,
3387                 __hc32 tag)
3388 {
3389         switch (hc32_to_cpu(fusbh200, tag)) {
3390         /* our fusbh200_shadow.qh is actually software part */
3391         case Q_TYPE_QH:
3392                 return &periodic->qh->hw->hw_next;
3393         /* others are hw parts */
3394         default:
3395                 return periodic->hw_next;
3396         }
3397 }
3398 
3399 /* caller must hold fusbh200->lock */
3400 static void periodic_unlink (struct fusbh200_hcd *fusbh200, unsigned frame, void *ptr)
3401 {
3402         union fusbh200_shadow   *prev_p = &fusbh200->pshadow[frame];
3403         __hc32                  *hw_p = &fusbh200->periodic[frame];
3404         union fusbh200_shadow   here = *prev_p;
3405 
3406         /* find predecessor of "ptr"; hw and shadow lists are in sync */
3407         while (here.ptr && here.ptr != ptr) {
3408                 prev_p = periodic_next_shadow(fusbh200, prev_p,
3409                                 Q_NEXT_TYPE(fusbh200, *hw_p));
3410                 hw_p = shadow_next_periodic(fusbh200, &here,
3411                                 Q_NEXT_TYPE(fusbh200, *hw_p));
3412                 here = *prev_p;
3413         }
3414         /* an interrupt entry (at list end) could have been shared */
3415         if (!here.ptr)
3416                 return;
3417 
3418         /* update shadow and hardware lists ... the old "next" pointers
3419          * from ptr may still be in use, the caller updates them.
3420          */
3421         *prev_p = *periodic_next_shadow(fusbh200, &here,
3422                         Q_NEXT_TYPE(fusbh200, *hw_p));
3423 
3424         *hw_p = *shadow_next_periodic(fusbh200, &here,
3425                                 Q_NEXT_TYPE(fusbh200, *hw_p));
3426 }
3427 
3428 /* how many of the uframe's 125 usecs are allocated? */
3429 static unsigned short
3430 periodic_usecs (struct fusbh200_hcd *fusbh200, unsigned frame, unsigned uframe)
3431 {
3432         __hc32                  *hw_p = &fusbh200->periodic [frame];
3433         union fusbh200_shadow   *q = &fusbh200->pshadow [frame];
3434         unsigned                usecs = 0;
3435         struct fusbh200_qh_hw   *hw;
3436 
3437         while (q->ptr) {
3438                 switch (hc32_to_cpu(fusbh200, Q_NEXT_TYPE(fusbh200, *hw_p))) {
3439                 case Q_TYPE_QH:
3440                         hw = q->qh->hw;
3441                         /* is it in the S-mask? */
3442                         if (hw->hw_info2 & cpu_to_hc32(fusbh200, 1 << uframe))
3443                                 usecs += q->qh->usecs;
3444                         /* ... or C-mask? */
3445                         if (hw->hw_info2 & cpu_to_hc32(fusbh200,
3446                                         1 << (8 + uframe)))
3447                                 usecs += q->qh->c_usecs;
3448                         hw_p = &hw->hw_next;
3449                         q = &q->qh->qh_next;
3450                         break;
3451                 // case Q_TYPE_FSTN:
3452                 default:
3453                         /* for "save place" FSTNs, count the relevant INTR
3454                          * bandwidth from the previous frame
3455                          */
3456                         if (q->fstn->hw_prev != FUSBH200_LIST_END(fusbh200)) {
3457                                 fusbh200_dbg (fusbh200, "ignoring FSTN cost ...\n");
3458                         }
3459                         hw_p = &q->fstn->hw_next;
3460                         q = &q->fstn->fstn_next;
3461                         break;
3462                 case Q_TYPE_ITD:
3463                         if (q->itd->hw_transaction[uframe])
3464                                 usecs += q->itd->stream->usecs;
3465                         hw_p = &q->itd->hw_next;
3466                         q = &q->itd->itd_next;
3467                         break;
3468                 }
3469         }
3470         if (usecs > fusbh200->uframe_periodic_max)
3471                 fusbh200_err (fusbh200, "uframe %d sched overrun: %d usecs\n",
3472                         frame * 8 + uframe, usecs);
3473         return usecs;
3474 }
3475 
3476 /*-------------------------------------------------------------------------*/
3477 
3478 static int same_tt (struct usb_device *dev1, struct usb_device *dev2)
3479 {
3480         if (!dev1->tt || !dev2->tt)
3481                 return 0;
3482         if (dev1->tt != dev2->tt)
3483                 return 0;
3484         if (dev1->tt->multi)
3485                 return dev1->ttport == dev2->ttport;
3486         else
3487                 return 1;
3488 }
3489 
3490 /* return true iff the device's transaction translator is available
3491  * for a periodic transfer starting at the specified frame, using
3492  * all the uframes in the mask.
3493  */
3494 static int tt_no_collision (
3495         struct fusbh200_hcd             *fusbh200,
3496         unsigned                period,
3497         struct usb_device       *dev,
3498         unsigned                frame,
3499         u32                     uf_mask
3500 )
3501 {
3502         if (period == 0)        /* error */
3503                 return 0;
3504 
3505         /* note bandwidth wastage:  split never follows csplit
3506          * (different dev or endpoint) until the next uframe.
3507          * calling convention doesn't make that distinction.
3508          */
3509         for (; frame < fusbh200->periodic_size; frame += period) {
3510                 union fusbh200_shadow   here;
3511                 __hc32                  type;
3512                 struct fusbh200_qh_hw   *hw;
3513 
3514                 here = fusbh200->pshadow [frame];
3515                 type = Q_NEXT_TYPE(fusbh200, fusbh200->periodic [frame]);
3516                 while (here.ptr) {
3517                         switch (hc32_to_cpu(fusbh200, type)) {
3518                         case Q_TYPE_ITD:
3519                                 type = Q_NEXT_TYPE(fusbh200, here.itd->hw_next);
3520                                 here = here.itd->itd_next;
3521                                 continue;
3522                         case Q_TYPE_QH:
3523                                 hw = here.qh->hw;
3524                                 if (same_tt (dev, here.qh->dev)) {
3525                                         u32             mask;
3526 
3527                                         mask = hc32_to_cpu(fusbh200,
3528                                                         hw->hw_info2);
3529                                         /* "knows" no gap is needed */
3530                                         mask |= mask >> 8;
3531                                         if (mask & uf_mask)
3532                                                 break;
3533                                 }
3534                                 type = Q_NEXT_TYPE(fusbh200, hw->hw_next);
3535                                 here = here.qh->qh_next;
3536                                 continue;
3537                         // case Q_TYPE_FSTN:
3538                         default:
3539                                 fusbh200_dbg (fusbh200,
3540                                         "periodic frame %d bogus type %d\n",
3541                                         frame, type);
3542                         }
3543 
3544                         /* collision or error */
3545                         return 0;
3546                 }
3547         }
3548 
3549         /* no collision */
3550         return 1;
3551 }
3552 
3553 /*-------------------------------------------------------------------------*/
3554 
3555 static void enable_periodic(struct fusbh200_hcd *fusbh200)
3556 {
3557         if (fusbh200->periodic_count++)
3558                 return;
3559 
3560         /* Stop waiting to turn off the periodic schedule */
3561         fusbh200->enabled_hrtimer_events &= ~BIT(FUSBH200_HRTIMER_DISABLE_PERIODIC);
3562 
3563         /* Don't start the schedule until PSS is 0 */
3564         fusbh200_poll_PSS(fusbh200);
3565         turn_on_io_watchdog(fusbh200);
3566 }
3567 
3568 static void disable_periodic(struct fusbh200_hcd *fusbh200)
3569 {
3570         if (--fusbh200->periodic_count)
3571                 return;
3572 
3573         /* Don't turn off the schedule until PSS is 1 */
3574         fusbh200_poll_PSS(fusbh200);
3575 }
3576 
3577 /*-------------------------------------------------------------------------*/
3578 
3579 /* periodic schedule slots have iso tds (normal or split) first, then a
3580  * sparse tree for active interrupt transfers.
3581  *
3582  * this just links in a qh; caller guarantees uframe masks are set right.
3583  * no FSTN support (yet; fusbh200 0.96+)
3584  */
3585 static void qh_link_periodic(struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh)
3586 {
3587         unsigned        i;
3588         unsigned        period = qh->period;
3589 
3590         dev_dbg (&qh->dev->dev,
3591                 "link qh%d-%04x/%p start %d [%d/%d us]\n",
3592                 period, hc32_to_cpup(fusbh200, &qh->hw->hw_info2)
3593                         & (QH_CMASK | QH_SMASK),
3594                 qh, qh->start, qh->usecs, qh->c_usecs);
3595 
3596         /* high bandwidth, or otherwise every microframe */
3597         if (period == 0)
3598                 period = 1;
3599 
3600         for (i = qh->start; i < fusbh200->periodic_size; i += period) {
3601                 union fusbh200_shadow   *prev = &fusbh200->pshadow[i];
3602                 __hc32                  *hw_p = &fusbh200->periodic[i];
3603                 union fusbh200_shadow   here = *prev;
3604                 __hc32                  type = 0;
3605 
3606                 /* skip the iso nodes at list head */
3607                 while (here.ptr) {
3608                         type = Q_NEXT_TYPE(fusbh200, *hw_p);
3609                         if (type == cpu_to_hc32(fusbh200, Q_TYPE_QH))
3610                                 break;
3611                         prev = periodic_next_shadow(fusbh200, prev, type);
3612                         hw_p = shadow_next_periodic(fusbh200, &here, type);
3613                         here = *prev;
3614                 }
3615 
3616                 /* sorting each branch by period (slow-->fast)
3617                  * enables sharing interior tree nodes
3618                  */
3619                 while (here.ptr && qh != here.qh) {
3620                         if (qh->period > here.qh->period)
3621                                 break;
3622                         prev = &here.qh->qh_next;
3623                         hw_p = &here.qh->hw->hw_next;
3624                         here = *prev;
3625                 }
3626                 /* link in this qh, unless some earlier pass did that */
3627                 if (qh != here.qh) {
3628                         qh->qh_next = here;
3629                         if (here.qh)
3630                                 qh->hw->hw_next = *hw_p;
3631                         wmb ();
3632                         prev->qh = qh;
3633                         *hw_p = QH_NEXT (fusbh200, qh->qh_dma);
3634                 }
3635         }
3636         qh->qh_state = QH_STATE_LINKED;
3637         qh->xacterrs = 0;
3638 
3639         /* update per-qh bandwidth for usbfs */
3640         fusbh200_to_hcd(fusbh200)->self.bandwidth_allocated += qh->period
3641                 ? ((qh->usecs + qh->c_usecs) / qh->period)
3642                 : (qh->usecs * 8);
3643 
3644         list_add(&qh->intr_node, &fusbh200->intr_qh_list);
3645 
3646         /* maybe enable periodic schedule processing */
3647         ++fusbh200->intr_count;
3648         enable_periodic(fusbh200);
3649 }
3650 
3651 static void qh_unlink_periodic(struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh)
3652 {
3653         unsigned        i;
3654         unsigned        period;
3655 
3656         /*
3657          * If qh is for a low/full-speed device, simply unlinking it
3658          * could interfere with an ongoing split transaction.  To unlink
3659          * it safely would require setting the QH_INACTIVATE bit and
3660          * waiting at least one frame, as described in EHCI 4.12.2.5.
3661          *
3662          * We won't bother with any of this.  Instead, we assume that the
3663          * only reason for unlinking an interrupt QH while the current URB
3664          * is still active is to dequeue all the URBs (flush the whole
3665          * endpoint queue).
3666          *
3667          * If rebalancing the periodic schedule is ever implemented, this
3668          * approach will no longer be valid.
3669          */
3670 
3671         /* high bandwidth, or otherwise part of every microframe */
3672         if ((period = qh->period) == 0)
3673                 period = 1;
3674 
3675         for (i = qh->start; i < fusbh200->periodic_size; i += period)
3676                 periodic_unlink (fusbh200, i, qh);
3677 
3678         /* update per-qh bandwidth for usbfs */
3679         fusbh200_to_hcd(fusbh200)->self.bandwidth_allocated -= qh->period
3680                 ? ((qh->usecs + qh->c_usecs) / qh->period)
3681                 : (qh->usecs * 8);
3682 
3683         dev_dbg (&qh->dev->dev,
3684                 "unlink qh%d-%04x/%p start %d [%d/%d us]\n",
3685                 qh->period,
3686                 hc32_to_cpup(fusbh200, &qh->hw->hw_info2) & (QH_CMASK | QH_SMASK),
3687                 qh, qh->start, qh->usecs, qh->c_usecs);
3688 
3689         /* qh->qh_next still "live" to HC */
3690         qh->qh_state = QH_STATE_UNLINK;
3691         qh->qh_next.ptr = NULL;
3692 
3693         if (fusbh200->qh_scan_next == qh)
3694                 fusbh200->qh_scan_next = list_entry(qh->intr_node.next,
3695                                 struct fusbh200_qh, intr_node);
3696         list_del(&qh->intr_node);
3697 }
3698 
3699 static void start_unlink_intr(struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh)
3700 {
3701         /* If the QH isn't linked then there's nothing we can do
3702          * unless we were called during a giveback, in which case
3703          * qh_completions() has to deal with it.
3704          */
3705         if (qh->qh_state != QH_STATE_LINKED) {
3706                 if (qh->qh_state == QH_STATE_COMPLETING)
3707                         qh->needs_rescan = 1;
3708                 return;
3709         }
3710 
3711         qh_unlink_periodic (fusbh200, qh);
3712 
3713         /* Make sure the unlinks are visible before starting the timer */
3714         wmb();
3715 
3716         /*
3717          * The EHCI spec doesn't say how long it takes the controller to
3718          * stop accessing an unlinked interrupt QH.  The timer delay is
3719          * 9 uframes; presumably that will be long enough.
3720          */
3721         qh->unlink_cycle = fusbh200->intr_unlink_cycle;
3722 
3723         /* New entries go at the end of the intr_unlink list */
3724         if (fusbh200->intr_unlink)
3725                 fusbh200->intr_unlink_last->unlink_next = qh;
3726         else
3727                 fusbh200->intr_unlink = qh;
3728         fusbh200->intr_unlink_last = qh;
3729 
3730         if (fusbh200->intr_unlinking)
3731                 ;       /* Avoid recursive calls */
3732         else if (fusbh200->rh_state < FUSBH200_RH_RUNNING)
3733                 fusbh200_handle_intr_unlinks(fusbh200);
3734         else if (fusbh200->intr_unlink == qh) {
3735                 fusbh200_enable_event(fusbh200, FUSBH200_HRTIMER_UNLINK_INTR, true);
3736                 ++fusbh200->intr_unlink_cycle;
3737         }
3738 }
3739 
3740 static void end_unlink_intr(struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh)
3741 {
3742         struct fusbh200_qh_hw   *hw = qh->hw;
3743         int                     rc;
3744 
3745         qh->qh_state = QH_STATE_IDLE;
3746         hw->hw_next = FUSBH200_LIST_END(fusbh200);
3747 
3748         qh_completions(fusbh200, qh);
3749 
3750         /* reschedule QH iff another request is queued */
3751         if (!list_empty(&qh->qtd_list) && fusbh200->rh_state == FUSBH200_RH_RUNNING) {
3752                 rc = qh_schedule(fusbh200, qh);
3753 
3754                 /* An error here likely indicates handshake failure
3755                  * or no space left in the schedule.  Neither fault
3756                  * should happen often ...
3757                  *
3758                  * FIXME kill the now-dysfunctional queued urbs
3759                  */
3760                 if (rc != 0)
3761                         fusbh200_err(fusbh200, "can't reschedule qh %p, err %d\n",
3762                                         qh, rc);
3763         }
3764 
3765         /* maybe turn off periodic schedule */
3766         --fusbh200->intr_count;
3767         disable_periodic(fusbh200);
3768 }
3769 
3770 /*-------------------------------------------------------------------------*/
3771 
3772 static int check_period (
3773         struct fusbh200_hcd *fusbh200,
3774         unsigned        frame,
3775         unsigned        uframe,
3776         unsigned        period,
3777         unsigned        usecs
3778 ) {
3779         int             claimed;
3780 
3781         /* complete split running into next frame?
3782          * given FSTN support, we could sometimes check...
3783          */
3784         if (uframe >= 8)
3785                 return 0;
3786 
3787         /* convert "usecs we need" to "max already claimed" */
3788         usecs = fusbh200->uframe_periodic_max - usecs;
3789 
3790         /* we "know" 2 and 4 uframe intervals were rejected; so
3791          * for period 0, check _every_ microframe in the schedule.
3792          */
3793         if (unlikely (period == 0)) {
3794                 do {
3795                         for (uframe = 0; uframe < 7; uframe++) {
3796                                 claimed = periodic_usecs (fusbh200, frame, uframe);
3797                                 if (claimed > usecs)
3798                                         return 0;
3799                         }
3800                 } while ((frame += 1) < fusbh200->periodic_size);
3801 
3802         /* just check the specified uframe, at that period */
3803         } else {
3804                 do {
3805                         claimed = periodic_usecs (fusbh200, frame, uframe);
3806                         if (claimed > usecs)
3807                                 return 0;
3808                 } while ((frame += period) < fusbh200->periodic_size);
3809         }
3810 
3811         // success!
3812         return 1;
3813 }
3814 
3815 static int check_intr_schedule (
3816         struct fusbh200_hcd             *fusbh200,
3817         unsigned                frame,
3818         unsigned                uframe,
3819         const struct fusbh200_qh        *qh,
3820         __hc32                  *c_maskp
3821 )
3822 {
3823         int             retval = -ENOSPC;
3824         u8              mask = 0;
3825 
3826         if (qh->c_usecs && uframe >= 6)         /* FSTN territory? */
3827                 goto done;
3828 
3829         if (!check_period (fusbh200, frame, uframe, qh->period, qh->usecs))
3830                 goto done;
3831         if (!qh->c_usecs) {
3832                 retval = 0;
3833                 *c_maskp = 0;
3834                 goto done;
3835         }
3836 
3837         /* Make sure this tt's buffer is also available for CSPLITs.
3838          * We pessimize a bit; probably the typical full speed case
3839          * doesn't need the second CSPLIT.
3840          *
3841          * NOTE:  both SPLIT and CSPLIT could be checked in just
3842          * one smart pass...
3843          */
3844         mask = 0x03 << (uframe + qh->gap_uf);
3845         *c_maskp = cpu_to_hc32(fusbh200, mask << 8);
3846 
3847         mask |= 1 << uframe;
3848         if (tt_no_collision (fusbh200, qh->period, qh->dev, frame, mask)) {
3849                 if (!check_period (fusbh200, frame, uframe + qh->gap_uf + 1,
3850                                         qh->period, qh->c_usecs))
3851                         goto done;
3852                 if (!check_period (fusbh200, frame, uframe + qh->gap_uf,
3853                                         qh->period, qh->c_usecs))
3854                         goto done;
3855                 retval = 0;
3856         }
3857 done:
3858         return retval;
3859 }
3860 
3861 /* "first fit" scheduling policy used the first time through,
3862  * or when the previous schedule slot can't be re-used.
3863  */
3864 static int qh_schedule(struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh)
3865 {
3866         int             status;
3867         unsigned        uframe;
3868         __hc32          c_mask;
3869         unsigned        frame;          /* 0..(qh->period - 1), or NO_FRAME */
3870         struct fusbh200_qh_hw   *hw = qh->hw;
3871 
3872         qh_refresh(fusbh200, qh);
3873         hw->hw_next = FUSBH200_LIST_END(fusbh200);
3874         frame = qh->start;
3875 
3876         /* reuse the previous schedule slots, if we can */
3877         if (frame < qh->period) {
3878                 uframe = ffs(hc32_to_cpup(fusbh200, &hw->hw_info2) & QH_SMASK);
3879                 status = check_intr_schedule (fusbh200, frame, --uframe,
3880                                 qh, &c_mask);
3881         } else {
3882                 uframe = 0;
3883                 c_mask = 0;
3884                 status = -ENOSPC;
3885         }
3886 
3887         /* else scan the schedule to find a group of slots such that all
3888          * uframes have enough periodic bandwidth available.
3889          */
3890         if (status) {
3891                 /* "normal" case, uframing flexible except with splits */
3892                 if (qh->period) {
3893                         int             i;
3894 
3895                         for (i = qh->period; status && i > 0; --i) {
3896                                 frame = ++fusbh200->random_frame % qh->period;
3897                                 for (uframe = 0; uframe < 8; uframe++) {
3898                                         status = check_intr_schedule (fusbh200,
3899                                                         frame, uframe, qh,
3900                                                         &c_mask);
3901                                         if (status == 0)
3902                                                 break;
3903                                 }
3904                         }
3905 
3906                 /* qh->period == 0 means every uframe */
3907                 } else {
3908                         frame = 0;
3909                         status = check_intr_schedule (fusbh200, 0, 0, qh, &c_mask);
3910                 }
3911                 if (status)
3912                         goto done;
3913                 qh->start = frame;
3914 
3915                 /* reset S-frame and (maybe) C-frame masks */
3916                 hw->hw_info2 &= cpu_to_hc32(fusbh200, ~(QH_CMASK | QH_SMASK));
3917                 hw->hw_info2 |= qh->period
3918                         ? cpu_to_hc32(fusbh200, 1 << uframe)
3919                         : cpu_to_hc32(fusbh200, QH_SMASK);
3920                 hw->hw_info2 |= c_mask;
3921         } else
3922                 fusbh200_dbg (fusbh200, "reused qh %p schedule\n", qh);
3923 
3924         /* stuff into the periodic schedule */
3925         qh_link_periodic(fusbh200, qh);
3926 done:
3927         return status;
3928 }
3929 
3930 static int intr_submit (
3931         struct fusbh200_hcd             *fusbh200,
3932         struct urb              *urb,
3933         struct list_head        *qtd_list,
3934         gfp_t                   mem_flags
3935 ) {
3936         unsigned                epnum;
3937         unsigned long           flags;
3938         struct fusbh200_qh              *qh;
3939         int                     status;
3940         struct list_head        empty;
3941 
3942         /* get endpoint and transfer/schedule data */
3943         epnum = urb->ep->desc.bEndpointAddress;
3944 
3945         spin_lock_irqsave (&fusbh200->lock, flags);
3946 
3947         if (unlikely(!HCD_HW_ACCESSIBLE(fusbh200_to_hcd(fusbh200)))) {
3948                 status = -ESHUTDOWN;
3949                 goto done_not_linked;
3950         }
3951         status = usb_hcd_link_urb_to_ep(fusbh200_to_hcd(fusbh200), urb);
3952         if (unlikely(status))
3953                 goto done_not_linked;
3954 
3955         /* get qh and force any scheduling errors */
3956         INIT_LIST_HEAD (&empty);
3957         qh = qh_append_tds(fusbh200, urb, &empty, epnum, &urb->ep->hcpriv);
3958         if (qh == NULL) {
3959                 status = -ENOMEM;
3960                 goto done;
3961         }
3962         if (qh->qh_state == QH_STATE_IDLE) {
3963                 if ((status = qh_schedule (fusbh200, qh)) != 0)
3964                         goto done;
3965         }
3966 
3967         /* then queue the urb's tds to the qh */
3968         qh = qh_append_tds(fusbh200, urb, qtd_list, epnum, &urb->ep->hcpriv);
3969         BUG_ON (qh == NULL);
3970 
3971         /* ... update usbfs periodic stats */
3972         fusbh200_to_hcd(fusbh200)->self.bandwidth_int_reqs++;
3973 
3974 done:
3975         if (unlikely(status))
3976                 usb_hcd_unlink_urb_from_ep(fusbh200_to_hcd(fusbh200), urb);
3977 done_not_linked:
3978         spin_unlock_irqrestore (&fusbh200->lock, flags);
3979         if (status)
3980                 qtd_list_free (fusbh200, urb, qtd_list);
3981 
3982         return status;
3983 }
3984 
3985 static void scan_intr(struct fusbh200_hcd *fusbh200)
3986 {
3987         struct fusbh200_qh              *qh;
3988 
3989         list_for_each_entry_safe(qh, fusbh200->qh_scan_next, &fusbh200->intr_qh_list,
3990                         intr_node) {
3991  rescan:
3992                 /* clean any finished work for this qh */
3993                 if (!list_empty(&qh->qtd_list)) {
3994                         int temp;
3995 
3996                         /*
3997                          * Unlinks could happen here; completion reporting
3998                          * drops the lock.  That's why fusbh200->qh_scan_next
3999                          * always holds the next qh to scan; if the next qh
4000                          * gets unlinked then fusbh200->qh_scan_next is adjusted
4001                          * in qh_unlink_periodic().
4002                          */
4003                         temp = qh_completions(fusbh200, qh);
4004                         if (unlikely(qh->needs_rescan ||
4005                                         (list_empty(&qh->qtd_list) &&
4006                                                 qh->qh_state == QH_STATE_LINKED)))
4007                                 start_unlink_intr(fusbh200, qh);
4008                         else if (temp != 0)
4009                                 goto rescan;
4010                 }
4011         }
4012 }
4013 
4014 /*-------------------------------------------------------------------------*/
4015 
4016 /* fusbh200_iso_stream ops work with both ITD and SITD */
4017 
4018 static struct fusbh200_iso_stream *
4019 iso_stream_alloc (gfp_t mem_flags)
4020 {
4021         struct fusbh200_iso_stream *stream;
4022 
4023         stream = kzalloc(sizeof *stream, mem_flags);
4024         if (likely (stream != NULL)) {
4025                 INIT_LIST_HEAD(&stream->td_list);
4026                 INIT_LIST_HEAD(&stream->free_list);
4027                 stream->next_uframe = -1;
4028         }
4029         return stream;
4030 }
4031 
4032 static void
4033 iso_stream_init (
4034         struct fusbh200_hcd             *fusbh200,
4035         struct fusbh200_iso_stream      *stream,
4036         struct usb_device       *dev,
4037         int                     pipe,
4038         unsigned                interval
4039 )
4040 {
4041         u32                     buf1;
4042         unsigned                epnum, maxp;
4043         int                     is_input;
4044         long                    bandwidth;
4045         unsigned                multi;
4046 
4047         /*
4048          * this might be a "high bandwidth" highspeed endpoint,
4049          * as encoded in the ep descriptor's wMaxPacket field
4050          */
4051         epnum = usb_pipeendpoint (pipe);
4052         is_input = usb_pipein (pipe) ? USB_DIR_IN : 0;
4053         maxp = usb_maxpacket(dev, pipe, !is_input);
4054         if (is_input) {
4055                 buf1 = (1 << 11);
4056         } else {
4057                 buf1 = 0;
4058         }
4059 
4060         maxp = max_packet(maxp);
4061         multi = hb_mult(maxp);
4062         buf1 |= maxp;
4063         maxp *= multi;
4064 
4065         stream->buf0 = cpu_to_hc32(fusbh200, (epnum << 8) | dev->devnum);
4066         stream->buf1 = cpu_to_hc32(fusbh200, buf1);
4067         stream->buf2 = cpu_to_hc32(fusbh200, multi);
4068 
4069         /* usbfs wants to report the average usecs per frame tied up
4070          * when transfers on this endpoint are scheduled ...
4071          */
4072         if (dev->speed == USB_SPEED_FULL) {
4073                 interval <<= 3;
4074                 stream->usecs = NS_TO_US(usb_calc_bus_time(dev->speed,
4075                                 is_input, 1, maxp));
4076                 stream->usecs /= 8;
4077         } else {
4078                 stream->highspeed = 1;
4079                 stream->usecs = HS_USECS_ISO (maxp);
4080         }
4081         bandwidth = stream->usecs * 8;
4082         bandwidth /= interval;
4083 
4084         stream->bandwidth = bandwidth;
4085         stream->udev = dev;
4086         stream->bEndpointAddress = is_input | epnum;
4087         stream->interval = interval;
4088         stream->maxp = maxp;
4089 }
4090 
4091 static struct fusbh200_iso_stream *
4092 iso_stream_find (struct fusbh200_hcd *fusbh200, struct urb *urb)
4093 {
4094         unsigned                epnum;
4095         struct fusbh200_iso_stream      *stream;
4096         struct usb_host_endpoint *ep;
4097         unsigned long           flags;
4098 
4099         epnum = usb_pipeendpoint (urb->pipe);
4100         if (usb_pipein(urb->pipe))
4101                 ep = urb->dev->ep_in[epnum];
4102         else
4103                 ep = urb->dev->ep_out[epnum];
4104 
4105         spin_lock_irqsave (&fusbh200->lock, flags);
4106         stream = ep->hcpriv;
4107 
4108         if (unlikely (stream == NULL)) {
4109                 stream = iso_stream_alloc(GFP_ATOMIC);
4110                 if (likely (stream != NULL)) {
4111                         ep->hcpriv = stream;
4112                         stream->ep = ep;
4113                         iso_stream_init(fusbh200, stream, urb->dev, urb->pipe,
4114                                         urb->interval);
4115                 }
4116 
4117         /* if dev->ep [epnum] is a QH, hw is set */
4118         } else if (unlikely (stream->hw != NULL)) {
4119                 fusbh200_dbg (fusbh200, "dev %s ep%d%s, not iso??\n",
4120                         urb->dev->devpath, epnum,
4121                         usb_pipein(urb->pipe) ? "in" : "out");
4122                 stream = NULL;
4123         }
4124 
4125         spin_unlock_irqrestore (&fusbh200->lock, flags);
4126         return stream;
4127 }
4128 
4129 /*-------------------------------------------------------------------------*/
4130 
4131 /* fusbh200_iso_sched ops can be ITD-only or SITD-only */
4132 
4133 static struct fusbh200_iso_sched *
4134 iso_sched_alloc (unsigned packets, gfp_t mem_flags)
4135 {
4136         struct fusbh200_iso_sched       *iso_sched;
4137         int                     size = sizeof *iso_sched;
4138 
4139         size += packets * sizeof (struct fusbh200_iso_packet);
4140         iso_sched = kzalloc(size, mem_flags);
4141         if (likely (iso_sched != NULL)) {
4142                 INIT_LIST_HEAD (&iso_sched->td_list);
4143         }
4144         return iso_sched;
4145 }
4146 
4147 static inline void
4148 itd_sched_init(
4149         struct fusbh200_hcd             *fusbh200,
4150         struct fusbh200_iso_sched       *iso_sched,
4151         struct fusbh200_iso_stream      *stream,
4152         struct urb              *urb
4153 )
4154 {
4155         unsigned        i;
4156         dma_addr_t      dma = urb->transfer_dma;
4157 
4158         /* how many uframes are needed for these transfers */
4159         iso_sched->span = urb->number_of_packets * stream->interval;
4160 
4161         /* figure out per-uframe itd fields that we'll need later
4162          * when we fit new itds into the schedule.
4163          */
4164         for (i = 0; i < urb->number_of_packets; i++) {
4165                 struct fusbh200_iso_packet      *uframe = &iso_sched->packet [i];
4166                 unsigned                length;
4167                 dma_addr_t              buf;
4168                 u32                     trans;
4169 
4170                 length = urb->iso_frame_desc [i].length;
4171                 buf = dma + urb->iso_frame_desc [i].offset;
4172 
4173                 trans = FUSBH200_ISOC_ACTIVE;
4174                 trans |= buf & 0x0fff;
4175                 if (unlikely (((i + 1) == urb->number_of_packets))
4176                                 && !(urb->transfer_flags & URB_NO_INTERRUPT))
4177                         trans |= FUSBH200_ITD_IOC;
4178                 trans |= length << 16;
4179                 uframe->transaction = cpu_to_hc32(fusbh200, trans);
4180 
4181                 /* might need to cross a buffer page within a uframe */
4182                 uframe->bufp = (buf & ~(u64)0x0fff);
4183                 buf += length;
4184                 if (unlikely ((uframe->bufp != (buf & ~(u64)0x0fff))))
4185                         uframe->cross = 1;
4186         }
4187 }
4188 
4189 static void
4190 iso_sched_free (
4191         struct fusbh200_iso_stream      *stream,
4192         struct fusbh200_iso_sched       *iso_sched
4193 )
4194 {
4195         if (!iso_sched)
4196                 return;
4197         // caller must hold fusbh200->lock!
4198         list_splice (&iso_sched->td_list, &stream->free_list);
4199         kfree (iso_sched);
4200 }
4201 
4202 static int
4203 itd_urb_transaction (
4204         struct fusbh200_iso_stream      *stream,
4205         struct fusbh200_hcd             *fusbh200,
4206         struct urb              *urb,
4207         gfp_t                   mem_flags
4208 )
4209 {
4210         struct fusbh200_itd             *itd;
4211         dma_addr_t              itd_dma;
4212         int                     i;
4213         unsigned                num_itds;
4214         struct fusbh200_iso_sched       *sched;
4215         unsigned long           flags;
4216 
4217         sched = iso_sched_alloc (urb->number_of_packets, mem_flags);
4218         if (unlikely (sched == NULL))
4219                 return -ENOMEM;
4220 
4221         itd_sched_init(fusbh200, sched, stream, urb);
4222 
4223         if (urb->interval < 8)
4224                 num_itds = 1 + (sched->span + 7) / 8;
4225         else
4226                 num_itds = urb->number_of_packets;
4227 
4228         /* allocate/init ITDs */
4229         spin_lock_irqsave (&fusbh200->lock, flags);
4230         for (i = 0; i < num_itds; i++) {
4231 
4232                 /*
4233                  * Use iTDs from the free list, but not iTDs that may
4234                  * still be in use by the hardware.
4235                  */
4236                 if (likely(!list_empty(&stream->free_list))) {
4237                         itd = list_first_entry(&stream->free_list,
4238                                         struct fusbh200_itd, itd_list);
4239                         if (itd->frame == fusbh200->now_frame)
4240                                 goto alloc_itd;
4241                         list_del (&itd->itd_list);
4242                         itd_dma = itd->itd_dma;
4243                 } else {
4244  alloc_itd:
4245                         spin_unlock_irqrestore (&fusbh200->lock, flags);
4246                         itd = dma_pool_alloc (fusbh200->itd_pool, mem_flags,
4247                                         &itd_dma);
4248                         spin_lock_irqsave (&fusbh200->lock, flags);
4249                         if (!itd) {
4250                                 iso_sched_free(stream, sched);
4251                                 spin_unlock_irqrestore(&fusbh200->lock, flags);
4252                                 return -ENOMEM;
4253                         }
4254                 }
4255 
4256                 memset (itd, 0, sizeof *itd);
4257                 itd->itd_dma = itd_dma;
4258                 list_add (&itd->itd_list, &sched->td_list);
4259         }
4260         spin_unlock_irqrestore (&fusbh200->lock, flags);
4261 
4262         /* temporarily store schedule info in hcpriv */
4263         urb->hcpriv = sched;
4264         urb->error_count = 0;
4265         return 0;
4266 }
4267 
4268 /*-------------------------------------------------------------------------*/
4269 
4270 static inline int
4271 itd_slot_ok (
4272         struct fusbh200_hcd             *fusbh200,
4273         u32                     mod,
4274         u32                     uframe,
4275         u8                      usecs,
4276         u32                     period
4277 )
4278 {
4279         uframe %= period;
4280         do {
4281                 /* can't commit more than uframe_periodic_max usec */
4282                 if (periodic_usecs (fusbh200, uframe >> 3, uframe & 0x7)
4283                                 > (fusbh200->uframe_periodic_max - usecs))
4284                         return 0;
4285 
4286                 /* we know urb->interval is 2^N uframes */
4287                 uframe += period;
4288         } while (uframe < mod);
4289         return 1;
4290 }
4291 
4292 /*
4293  * This scheduler plans almost as far into the future as it has actual
4294  * periodic schedule slots.  (Affected by TUNE_FLS, which defaults to
4295  * "as small as possible" to be cache-friendlier.)  That limits the size
4296  * transfers you can stream reliably; avoid more than 64 msec per urb.
4297  * Also avoid queue depths of less than fusbh200's worst irq latency (affected
4298  * by the per-urb URB_NO_INTERRUPT hint, the log2_irq_thresh module parameter,
4299  * and other factors); or more than about 230 msec total (for portability,
4300  * given FUSBH200_TUNE_FLS and the slop).  Or, write a smarter scheduler!
4301  */
4302 
4303 #define SCHEDULE_SLOP   80      /* microframes */
4304 
4305 static int
4306 iso_stream_schedule (
4307         struct fusbh200_hcd             *fusbh200,
4308         struct urb              *urb,
4309         struct fusbh200_iso_stream      *stream
4310 )
4311 {
4312         u32                     now, next, start, period, span;
4313         int                     status;
4314         unsigned                mod = fusbh200->periodic_size << 3;
4315         struct fusbh200_iso_sched       *sched = urb->hcpriv;
4316 
4317         period = urb->interval;
4318         span = sched->span;
4319 
4320         if (span > mod - SCHEDULE_SLOP) {
4321                 fusbh200_dbg (fusbh200, "iso request %p too long\n", urb);
4322                 status = -EFBIG;
4323                 goto fail;
4324         }
4325 
4326         now = fusbh200_read_frame_index(fusbh200) & (mod - 1);
4327 
4328         /* Typical case: reuse current schedule, stream is still active.
4329          * Hopefully there are no gaps from the host falling behind
4330          * (irq delays etc), but if there are we'll take the next
4331          * slot in the schedule, implicitly assuming URB_ISO_ASAP.
4332          */
4333         if (likely (!list_empty (&stream->td_list))) {
4334                 u32     excess;
4335 
4336                 /* For high speed devices, allow scheduling within the
4337                  * isochronous scheduling threshold.  For full speed devices
4338                  * and Intel PCI-based controllers, don't (work around for
4339                  * Intel ICH9 bug).
4340                  */
4341                 if (!stream->highspeed && fusbh200->fs_i_thresh)
4342                         next = now + fusbh200->i_thresh;
4343                 else
4344                         next = now;
4345 
4346                 /* Fell behind (by up to twice the slop amount)?
4347                  * We decide based on the time of the last currently-scheduled
4348                  * slot, not the time of the next available slot.
4349                  */
4350                 excess = (stream->next_uframe - period - next) & (mod - 1);
4351                 if (excess >= mod - 2 * SCHEDULE_SLOP)
4352                         start = next + excess - mod + period *
4353                                         DIV_ROUND_UP(mod - excess, period);
4354                 else
4355                         start = next + excess + period;
4356                 if (start - now >= mod) {
4357                         fusbh200_dbg(fusbh200, "request %p would overflow (%d+%d >= %d)\n",
4358                                         urb, start - now - period, period,
4359                                         mod);
4360                         status = -EFBIG;
4361                         goto fail;
4362                 }
4363         }
4364 
4365         /* need to schedule; when's the next (u)frame we could start?
4366          * this is bigger than fusbh200->i_thresh allows; scheduling itself
4367          * isn't free, the slop should handle reasonably slow cpus.  it
4368          * can also help high bandwidth if the dma and irq loads don't
4369          * jump until after the queue is primed.
4370          */
4371         else {
4372                 int done = 0;
4373                 start = SCHEDULE_SLOP + (now & ~0x07);
4374 
4375                 /* NOTE:  assumes URB_ISO_ASAP, to limit complexity/bugs */
4376 
4377                 /* find a uframe slot with enough bandwidth.
4378                  * Early uframes are more precious because full-speed
4379                  * iso IN transfers can't use late uframes,
4380                  * and therefore they should be allocated last.
4381                  */
4382                 next = start;
4383                 start += period;
4384                 do {
4385                         start--;
4386                         /* check schedule: enough space? */
4387                         if (itd_slot_ok(fusbh200, mod, start,
4388                                         stream->usecs, period))
4389                                 done = 1;
4390                 } while (start > next && !done);
4391 
4392                 /* no room in the schedule */
4393                 if (!done) {
4394                         fusbh200_dbg(fusbh200, "iso resched full %p (now %d max %d)\n",
4395                                 urb, now, now + mod);
4396                         status = -ENOSPC;
4397                         goto fail;
4398                 }
4399         }
4400 
4401         /* Tried to schedule too far into the future? */
4402         if (unlikely(start - now + span - period
4403                                 >= mod - 2 * SCHEDULE_SLOP)) {
4404                 fusbh200_dbg(fusbh200, "request %p would overflow (%d+%d >= %d)\n",
4405                                 urb, start - now, span - period,
4406                                 mod - 2 * SCHEDULE_SLOP);
4407                 status = -EFBIG;
4408                 goto fail;
4409         }
4410 
4411         stream->next_uframe = start & (mod - 1);
4412 
4413         /* report high speed start in uframes; full speed, in frames */
4414         urb->start_frame = stream->next_uframe;
4415         if (!stream->highspeed)
4416                 urb->start_frame >>= 3;
4417 
4418         /* Make sure scan_isoc() sees these */
4419         if (fusbh200->isoc_count == 0)
4420                 fusbh200->next_frame = now >> 3;
4421         return 0;
4422 
4423  fail:
4424         iso_sched_free(stream, sched);
4425         urb->hcpriv = NULL;
4426         return status;
4427 }
4428 
4429 /*-------------------------------------------------------------------------*/
4430 
4431 static inline void
4432 itd_init(struct fusbh200_hcd *fusbh200, struct fusbh200_iso_stream *stream,
4433                 struct fusbh200_itd *itd)
4434 {
4435         int i;
4436 
4437         /* it's been recently zeroed */
4438         itd->hw_next = FUSBH200_LIST_END(fusbh200);
4439         itd->hw_bufp [0] = stream->buf0;
4440         itd->hw_bufp [1] = stream->buf1;
4441         itd->hw_bufp [2] = stream->buf2;
4442 
4443         for (i = 0; i < 8; i++)
4444                 itd->index[i] = -1;
4445 
4446         /* All other fields are filled when scheduling */
4447 }
4448 
4449 static inline void
4450 itd_patch(
4451         struct fusbh200_hcd             *fusbh200,
4452         struct fusbh200_itd             *itd,
4453         struct fusbh200_iso_sched       *iso_sched,
4454         unsigned                index,
4455         u16                     uframe
4456 )
4457 {
4458         struct fusbh200_iso_packet      *uf = &iso_sched->packet [index];
4459         unsigned                pg = itd->pg;
4460 
4461         // BUG_ON (pg == 6 && uf->cross);
4462 
4463         uframe &= 0x07;
4464         itd->index [uframe] = index;
4465 
4466         itd->hw_transaction[uframe] = uf->transaction;
4467         itd->hw_transaction[uframe] |= cpu_to_hc32(fusbh200, pg << 12);
4468         itd->hw_bufp[pg] |= cpu_to_hc32(fusbh200, uf->bufp & ~(u32)0);
4469         itd->hw_bufp_hi[pg] |= cpu_to_hc32(fusbh200, (u32)(uf->bufp >> 32));
4470 
4471         /* iso_frame_desc[].offset must be strictly increasing */
4472         if (unlikely (uf->cross)) {
4473                 u64     bufp = uf->bufp + 4096;
4474 
4475                 itd->pg = ++pg;
4476                 itd->hw_bufp[pg] |= cpu_to_hc32(fusbh200, bufp & ~(u32)0);
4477                 itd->hw_bufp_hi[pg] |= cpu_to_hc32(fusbh200, (u32)(bufp >> 32));
4478         }
4479 }
4480 
4481 static inline void
4482 itd_link (struct fusbh200_hcd *fusbh200, unsigned frame, struct fusbh200_itd *itd)
4483 {
4484         union fusbh200_shadow   *prev = &fusbh200->pshadow[frame];
4485         __hc32                  *hw_p = &fusbh200->periodic[frame];
4486         union fusbh200_shadow   here = *prev;
4487         __hc32                  type = 0;
4488 
4489         /* skip any iso nodes which might belong to previous microframes */
4490         while (here.ptr) {
4491                 type = Q_NEXT_TYPE(fusbh200, *hw_p);
4492                 if (type == cpu_to_hc32(fusbh200, Q_TYPE_QH))
4493                         break;
4494                 prev = periodic_next_shadow(fusbh200, prev, type);
4495                 hw_p = shadow_next_periodic(fusbh200, &here, type);
4496                 here = *prev;
4497         }
4498 
4499         itd->itd_next = here;
4500         itd->hw_next = *hw_p;
4501         prev->itd = itd;
4502         itd->frame = frame;
4503         wmb ();
4504         *hw_p = cpu_to_hc32(fusbh200, itd->itd_dma | Q_TYPE_ITD);
4505 }
4506 
4507 /* fit urb's itds into the selected schedule slot; activate as needed */
4508 static void itd_link_urb(
4509         struct fusbh200_hcd             *fusbh200,
4510         struct urb              *urb,
4511         unsigned                mod,
4512         struct fusbh200_iso_stream      *stream
4513 )
4514 {
4515         int                     packet;
4516         unsigned                next_uframe, uframe, frame;
4517         struct fusbh200_iso_sched       *iso_sched = urb->hcpriv;
4518         struct fusbh200_itd             *itd;
4519 
4520         next_uframe = stream->next_uframe & (mod - 1);
4521 
4522         if (unlikely (list_empty(&stream->td_list))) {
4523                 fusbh200_to_hcd(fusbh200)->self.bandwidth_allocated
4524                                 += stream->bandwidth;
4525                 fusbh200_dbg(fusbh200,
4526                         "schedule devp %s ep%d%s-iso period %d start %d.%d\n",
4527                         urb->dev->devpath, stream->bEndpointAddress & 0x0f,
4528                         (stream->bEndpointAddress & USB_DIR_IN) ? "in" : "out",
4529                         urb->interval,
4530                         next_uframe >> 3, next_uframe & 0x7);
4531         }
4532 
4533         /* fill iTDs uframe by uframe */
4534         for (packet = 0, itd = NULL; packet < urb->number_of_packets; ) {
4535                 if (itd == NULL) {
4536                         /* ASSERT:  we have all necessary itds */
4537                         // BUG_ON (list_empty (&iso_sched->td_list));
4538 
4539                         /* ASSERT:  no itds for this endpoint in this uframe */
4540 
4541                         itd = list_entry (iso_sched->td_list.next,
4542                                         struct fusbh200_itd, itd_list);
4543                         list_move_tail (&itd->itd_list, &stream->td_list);
4544                         itd->stream = stream;
4545                         itd->urb = urb;
4546                         itd_init (fusbh200, stream, itd);
4547                 }
4548 
4549                 uframe = next_uframe & 0x07;
4550                 frame = next_uframe >> 3;
4551 
4552                 itd_patch(fusbh200, itd, iso_sched, packet, uframe);
4553 
4554                 next_uframe += stream->interval;
4555                 next_uframe &= mod - 1;
4556                 packet++;
4557 
4558                 /* link completed itds into the schedule */
4559                 if (((next_uframe >> 3) != frame)
4560                                 || packet == urb->number_of_packets) {
4561                         itd_link(fusbh200, frame & (fusbh200->periodic_size - 1), itd);
4562                         itd = NULL;
4563                 }
4564         }
4565         stream->next_uframe = next_uframe;
4566 
4567         /* don't need that schedule data any more */
4568         iso_sched_free (stream, iso_sched);
4569         urb->hcpriv = NULL;
4570 
4571         ++fusbh200->isoc_count;
4572         enable_periodic(fusbh200);
4573 }
4574 
4575 #define ISO_ERRS (FUSBH200_ISOC_BUF_ERR | FUSBH200_ISOC_BABBLE | FUSBH200_ISOC_XACTERR)
4576 
4577 /* Process and recycle a completed ITD.  Return true iff its urb completed,
4578  * and hence its completion callback probably added things to the hardware
4579  * schedule.
4580  *
4581  * Note that we carefully avoid recycling this descriptor until after any
4582  * completion callback runs, so that it won't be reused quickly.  That is,
4583  * assuming (a) no more than two urbs per frame on this endpoint, and also
4584  * (b) only this endpoint's completions submit URBs.  It seems some silicon
4585  * corrupts things if you reuse completed descriptors very quickly...
4586  */
4587 static bool itd_complete(struct fusbh200_hcd *fusbh200, struct fusbh200_itd *itd)
4588 {
4589         struct urb                              *urb = itd->urb;
4590         struct usb_iso_packet_descriptor        *desc;
4591         u32                                     t;
4592         unsigned                                uframe;
4593         int                                     urb_index = -1;
4594         struct fusbh200_iso_stream                      *stream = itd->stream;
4595         struct usb_device                       *dev;
4596         bool                                    retval = false;
4597 
4598         /* for each uframe with a packet */
4599         for (uframe = 0; uframe < 8; uframe++) {
4600                 if (likely (itd->index[uframe] == -1))
4601                         continue;
4602                 urb_index = itd->index[uframe];
4603                 desc = &urb->iso_frame_desc [urb_index];
4604 
4605                 t = hc32_to_cpup(fusbh200, &itd->hw_transaction [uframe]);
4606                 itd->hw_transaction [uframe] = 0;
4607 
4608                 /* report transfer status */
4609                 if (unlikely (t & ISO_ERRS)) {
4610                         urb->error_count++;
4611                         if (t & FUSBH200_ISOC_BUF_ERR)
4612                                 desc->status = usb_pipein (urb->pipe)
4613                                         ? -ENOSR  /* hc couldn't read */
4614                                         : -ECOMM; /* hc couldn't write */
4615                         else if (t & FUSBH200_ISOC_BABBLE)
4616                                 desc->status = -EOVERFLOW;
4617                         else /* (t & FUSBH200_ISOC_XACTERR) */
4618                                 desc->status = -EPROTO;
4619 
4620                         /* HC need not update length with this error */
4621                         if (!(t & FUSBH200_ISOC_BABBLE)) {
4622                                 desc->actual_length = fusbh200_itdlen(urb, desc, t);
4623                                 urb->actual_length += desc->actual_length;
4624                         }
4625                 } else if (likely ((t & FUSBH200_ISOC_ACTIVE) == 0)) {
4626                         desc->status = 0;
4627                         desc->actual_length = fusbh200_itdlen(urb, desc, t);
4628                         urb->actual_length += desc->actual_length;
4629                 } else {
4630                         /* URB was too late */
4631                         desc->status = -EXDEV;
4632                 }
4633         }
4634 
4635         /* handle completion now? */
4636         if (likely ((urb_index + 1) != urb->number_of_packets))
4637                 goto done;
4638 
4639         /* ASSERT: it's really the last itd for this urb
4640         list_for_each_entry (itd, &stream->td_list, itd_list)
4641                 BUG_ON (itd->urb == urb);
4642          */
4643 
4644         /* give urb back to the driver; completion often (re)submits */
4645         dev = urb->dev;
4646         fusbh200_urb_done(fusbh200, urb, 0);
4647         retval = true;
4648         urb = NULL;
4649 
4650         --fusbh200->isoc_count;
4651         disable_periodic(fusbh200);
4652 
4653         if (unlikely(list_is_singular(&stream->td_list))) {
4654                 fusbh200_to_hcd(fusbh200)->self.bandwidth_allocated
4655                                 -= stream->bandwidth;
4656                 fusbh200_dbg(fusbh200,
4657                         "deschedule devp %s ep%d%s-iso\n",
4658                         dev->devpath, stream->bEndpointAddress & 0x0f,
4659                         (stream->bEndpointAddress & USB_DIR_IN) ? "in" : "out");
4660         }
4661 
4662 done:
4663         itd->urb = NULL;
4664 
4665         /* Add to the end of the free list for later reuse */
4666         list_move_tail(&itd->itd_list, &stream->free_list);
4667 
4668         /* Recycle the iTDs when the pipeline is empty (ep no longer in use) */
4669         if (list_empty(&stream->td_list)) {
4670                 list_splice_tail_init(&stream->free_list,
4671                                 &fusbh200->cached_itd_list);
4672                 start_free_itds(fusbh200);
4673         }
4674 
4675         return retval;
4676 }
4677 
4678 /*-------------------------------------------------------------------------*/
4679 
4680 static int itd_submit (struct fusbh200_hcd *fusbh200, struct urb *urb,
4681         gfp_t mem_flags)
4682 {
4683         int                     status = -EINVAL;
4684         unsigned long           flags;
4685         struct fusbh200_iso_stream      *stream;
4686 
4687         /* Get iso_stream head */
4688         stream = iso_stream_find (fusbh200, urb);
4689         if (unlikely (stream == NULL)) {
4690                 fusbh200_dbg (fusbh200, "can't get iso stream\n");
4691                 return -ENOMEM;
4692         }
4693         if (unlikely (urb->interval != stream->interval &&
4694                       fusbh200_port_speed(fusbh200, 0) == USB_PORT_STAT_HIGH_SPEED)) {
4695                         fusbh200_dbg (fusbh200, "can't change iso interval %d --> %d\n",
4696                                 stream->interval, urb->interval);
4697                         goto done;
4698         }
4699 
4700 #ifdef FUSBH200_URB_TRACE
4701         fusbh200_dbg (fusbh200,
4702                 "%s %s urb %p ep%d%s len %d, %d pkts %d uframes [%p]\n",
4703                 __func__, urb->dev->devpath, urb,
4704                 usb_pipeendpoint (urb->pipe),
4705                 usb_pipein (urb->pipe) ? "in" : "out",
4706                 urb->transfer_buffer_length,
4707                 urb->number_of_packets, urb->interval,
4708                 stream);
4709 #endif
4710 
4711         /* allocate ITDs w/o locking anything */
4712         status = itd_urb_transaction (stream, fusbh200, urb, mem_flags);
4713         if (unlikely (status < 0)) {
4714                 fusbh200_dbg (fusbh200, "can't init itds\n");
4715                 goto done;
4716         }
4717 
4718         /* schedule ... need to lock */
4719         spin_lock_irqsave (&fusbh200->lock, flags);
4720         if (unlikely(!HCD_HW_ACCESSIBLE(fusbh200_to_hcd(fusbh200)))) {
4721                 status = -ESHUTDOWN;
4722                 goto done_not_linked;
4723         }
4724         status = usb_hcd_link_urb_to_ep(fusbh200_to_hcd(fusbh200), urb);
4725         if (unlikely(status))
4726                 goto done_not_linked;
4727         status = iso_stream_schedule(fusbh200, urb, stream);
4728         if (likely (status == 0))
4729                 itd_link_urb (fusbh200, urb, fusbh200->periodic_size << 3, stream);
4730         else
4731                 usb_hcd_unlink_urb_from_ep(fusbh200_to_hcd(fusbh200), urb);
4732  done_not_linked:
4733         spin_unlock_irqrestore (&fusbh200->lock, flags);
4734  done:
4735         return status;
4736 }
4737 
4738 /*-------------------------------------------------------------------------*/
4739 
4740 static void scan_isoc(struct fusbh200_hcd *fusbh200)
4741 {
4742         unsigned        uf, now_frame, frame;
4743         unsigned        fmask = fusbh200->periodic_size - 1;
4744         bool            modified, live;
4745 
4746         /*
4747          * When running, scan from last scan point up to "now"
4748          * else clean up by scanning everything that's left.
4749          * Touches as few pages as possible:  cache-friendly.
4750          */
4751         if (fusbh200->rh_state >= FUSBH200_RH_RUNNING) {
4752                 uf = fusbh200_read_frame_index(fusbh200);
4753                 now_frame = (uf >> 3) & fmask;
4754                 live = true;
4755         } else  {
4756                 now_frame = (fusbh200->next_frame - 1) & fmask;
4757                 live = false;
4758         }
4759         fusbh200->now_frame = now_frame;
4760 
4761         frame = fusbh200->next_frame;
4762         for (;;) {
4763                 union fusbh200_shadow   q, *q_p;
4764                 __hc32                  type, *hw_p;
4765 
4766 restart:
4767                 /* scan each element in frame's queue for completions */
4768                 q_p = &fusbh200->pshadow [frame];
4769                 hw_p = &fusbh200->periodic [frame];
4770                 q.ptr = q_p->ptr;
4771                 type = Q_NEXT_TYPE(fusbh200, *hw_p);
4772                 modified = false;
4773 
4774                 while (q.ptr != NULL) {
4775                         switch (hc32_to_cpu(fusbh200, type)) {
4776                         case Q_TYPE_ITD:
4777                                 /* If this ITD is still active, leave it for
4778                                  * later processing ... check the next entry.
4779                                  * No need to check for activity unless the
4780                                  * frame is current.
4781                                  */
4782                                 if (frame == now_frame && live) {
4783                                         rmb();
4784                                         for (uf = 0; uf < 8; uf++) {
4785                                                 if (q.itd->hw_transaction[uf] &
4786                                                             ITD_ACTIVE(fusbh200))
4787                                                         break;
4788                                         }
4789                                         if (uf < 8) {
4790                                                 q_p = &q.itd->itd_next;
4791                                                 hw_p = &q.itd->hw_next;
4792                                                 type = Q_NEXT_TYPE(fusbh200,
4793                                                         q.itd->hw_next);
4794                                                 q = *q_p;
4795                                                 break;
4796                                         }
4797                                 }
4798 
4799                                 /* Take finished ITDs out of the schedule
4800                                  * and process them:  recycle, maybe report
4801                                  * URB completion.  HC won't cache the
4802                                  * pointer for much longer, if at all.
4803                                  */
4804                                 *q_p = q.itd->itd_next;
4805                                 *hw_p = q.itd->hw_next;
4806                                 type = Q_NEXT_TYPE(fusbh200, q.itd->hw_next);
4807                                 wmb();
4808                                 modified = itd_complete (fusbh200, q.itd);
4809                                 q = *q_p;
4810                                 break;
4811                         default:
4812                                 fusbh200_dbg(fusbh200, "corrupt type %d frame %d shadow %p\n",
4813                                         type, frame, q.ptr);
4814                                 // BUG ();
4815                                 /* FALL THROUGH */
4816                         case Q_TYPE_QH:
4817                         case Q_TYPE_FSTN:
4818                                 /* End of the iTDs and siTDs */
4819                                 q.ptr = NULL;
4820                                 break;
4821                         }
4822 
4823                         /* assume completion callbacks modify the queue */
4824                         if (unlikely(modified && fusbh200->isoc_count > 0))
4825                                 goto restart;
4826                 }
4827 
4828                 /* Stop when we have reached the current frame */
4829                 if (frame == now_frame)
4830                         break;
4831                 frame = (frame + 1) & fmask;
4832         }
4833         fusbh200->next_frame = now_frame;
4834 }
4835 /*-------------------------------------------------------------------------*/
4836 /*
4837  * Display / Set uframe_periodic_max
4838  */
4839 static ssize_t show_uframe_periodic_max(struct device *dev,
4840                                         struct device_attribute *attr,
4841                                         char *buf)
4842 {
4843         struct fusbh200_hcd             *fusbh200;
4844         int                     n;
4845 
4846         fusbh200 = hcd_to_fusbh200(bus_to_hcd(dev_get_drvdata(dev)));
4847         n = scnprintf(buf, PAGE_SIZE, "%d\n", fusbh200->uframe_periodic_max);
4848         return n;
4849 }
4850 
4851 
4852 static ssize_t store_uframe_periodic_max(struct device *dev,
4853                                         struct device_attribute *attr,
4854                                         const char *buf, size_t count)
4855 {
4856         struct fusbh200_hcd             *fusbh200;
4857         unsigned                uframe_periodic_max;
4858         unsigned                frame, uframe;
4859         unsigned short          allocated_max;
4860         unsigned long           flags;
4861         ssize_t                 ret;
4862 
4863         fusbh200 = hcd_to_fusbh200(bus_to_hcd(dev_get_drvdata(dev)));
4864         if (kstrtouint(buf, 0, &uframe_periodic_max) < 0)
4865                 return -EINVAL;
4866 
4867         if (uframe_periodic_max < 100 || uframe_periodic_max >= 125) {
4868                 fusbh200_info(fusbh200, "rejecting invalid request for "
4869                                 "uframe_periodic_max=%u\n", uframe_periodic_max);
4870                 return -EINVAL;
4871         }
4872 
4873         ret = -EINVAL;
4874 
4875         /*
4876          * lock, so that our checking does not race with possible periodic
4877          * bandwidth allocation through submitting new urbs.
4878          */
4879         spin_lock_irqsave (&fusbh200->lock, flags);
4880 
4881         /*
4882          * for request to decrease max periodic bandwidth, we have to check
4883          * every microframe in the schedule to see whether the decrease is
4884          * possible.
4885          */
4886         if (uframe_periodic_max < fusbh200->uframe_periodic_max) {
4887                 allocated_max = 0;
4888 
4889                 for (frame = 0; frame < fusbh200->periodic_size; ++frame)
4890                         for (uframe = 0; uframe < 7; ++uframe)
4891                                 allocated_max = max(allocated_max,
4892                                                     periodic_usecs (fusbh200, frame, uframe));
4893 
4894                 if (allocated_max > uframe_periodic_max) {
4895                         fusbh200_info(fusbh200,
4896                                 "cannot decrease uframe_periodic_max becase "
4897                                 "periodic bandwidth is already allocated "
4898                                 "(%u > %u)\n",
4899                                 allocated_max, uframe_periodic_max);
4900                         goto out_unlock;
4901                 }
4902         }
4903 
4904         /* increasing is always ok */
4905 
4906         fusbh200_info(fusbh200, "setting max periodic bandwidth to %u%% "
4907                         "(== %u usec/uframe)\n",
4908                         100*uframe_periodic_max/125, uframe_periodic_max);
4909 
4910         if (uframe_periodic_max != 100)
4911                 fusbh200_warn(fusbh200, "max periodic bandwidth set is non-standard\n");
4912 
4913         fusbh200->uframe_periodic_max = uframe_periodic_max;
4914         ret = count;
4915 
4916 out_unlock:
4917         spin_unlock_irqrestore (&fusbh200->lock, flags);
4918         return ret;
4919 }
4920 static DEVICE_ATTR(uframe_periodic_max, 0644, show_uframe_periodic_max, store_uframe_periodic_max);
4921 
4922 
4923 static inline int create_sysfs_files(struct fusbh200_hcd *fusbh200)
4924 {
4925         struct device   *controller = fusbh200_to_hcd(fusbh200)->self.controller;
4926         int     i = 0;
4927 
4928         if (i)
4929                 goto out;
4930 
4931         i = device_create_file(controller, &dev_attr_uframe_periodic_max);
4932 out:
4933         return i;
4934 }
4935 
4936 static inline void remove_sysfs_files(struct fusbh200_hcd *fusbh200)
4937 {
4938         struct device   *controller = fusbh200_to_hcd(fusbh200)->self.controller;
4939 
4940         device_remove_file(controller, &dev_attr_uframe_periodic_max);
4941 }
4942 /*-------------------------------------------------------------------------*/
4943 
4944 /* On some systems, leaving remote wakeup enabled prevents system shutdown.
4945  * The firmware seems to think that powering off is a wakeup event!
4946  * This routine turns off remote wakeup and everything else, on all ports.
4947  */
4948 static void fusbh200_turn_off_all_ports(struct fusbh200_hcd *fusbh200)
4949 {
4950         u32 __iomem *status_reg = &fusbh200->regs->port_status;
4951 
4952         fusbh200_writel(fusbh200, PORT_RWC_BITS, status_reg);
4953 }
4954 
4955 /*
4956  * Halt HC, turn off all ports, and let the BIOS use the companion controllers.
4957  * Must be called with interrupts enabled and the lock not held.
4958  */
4959 static void fusbh200_silence_controller(struct fusbh200_hcd *fusbh200)
4960 {
4961         fusbh200_halt(fusbh200);
4962 
4963         spin_lock_irq(&fusbh200->lock);
4964         fusbh200->rh_state = FUSBH200_RH_HALTED;
4965         fusbh200_turn_off_all_ports(fusbh200);
4966         spin_unlock_irq(&fusbh200->lock);
4967 }
4968 
4969 /* fusbh200_shutdown kick in for silicon on any bus (not just pci, etc).
4970  * This forcibly disables dma and IRQs, helping kexec and other cases
4971  * where the next system software may expect clean state.
4972  */
4973 static void fusbh200_shutdown(struct usb_hcd *hcd)
4974 {
4975         struct fusbh200_hcd     *fusbh200 = hcd_to_fusbh200(hcd);
4976 
4977         spin_lock_irq(&fusbh200->lock);
4978         fusbh200->shutdown = true;
4979         fusbh200->rh_state = FUSBH200_RH_STOPPING;
4980         fusbh200->enabled_hrtimer_events = 0;
4981         spin_unlock_irq(&fusbh200->lock);
4982 
4983         fusbh200_silence_controller(fusbh200);
4984 
4985         hrtimer_cancel(&fusbh200->hrtimer);
4986 }
4987 
4988 /*-------------------------------------------------------------------------*/
4989 
4990 /*
4991  * fusbh200_work is called from some interrupts, timers, and so on.
4992  * it calls driver completion functions, after dropping fusbh200->lock.
4993  */
4994 static void fusbh200_work (struct fusbh200_hcd *fusbh200)
4995 {
4996         /* another CPU may drop fusbh200->lock during a schedule scan while
4997          * it reports urb completions.  this flag guards against bogus
4998          * attempts at re-entrant schedule scanning.
4999          */
5000         if (fusbh200->scanning) {
5001                 fusbh200->need_rescan = true;
5002                 return;
5003         }
5004         fusbh200->scanning = true;
5005 
5006  rescan:
5007         fusbh200->need_rescan = false;
5008         if (fusbh200->async_count)
5009                 scan_async(fusbh200);
5010         if (fusbh200->intr_count > 0)
5011                 scan_intr(fusbh200);
5012         if (fusbh200->isoc_count > 0)
5013                 scan_isoc(fusbh200);
5014         if (fusbh200->need_rescan)
5015                 goto rescan;
5016         fusbh200->scanning = false;
5017 
5018         /* the IO watchdog guards against hardware or driver bugs that
5019          * misplace IRQs, and should let us run completely without IRQs.
5020          * such lossage has been observed on both VT6202 and VT8235.
5021          */
5022         turn_on_io_watchdog(fusbh200);
5023 }
5024 
5025 /*
5026  * Called when the fusbh200_hcd module is removed.
5027  */
5028 static void fusbh200_stop (struct usb_hcd *hcd)
5029 {
5030         struct fusbh200_hcd             *fusbh200 = hcd_to_fusbh200 (hcd);
5031 
5032         fusbh200_dbg (fusbh200, "stop\n");
5033 
5034         /* no more interrupts ... */
5035 
5036         spin_lock_irq(&fusbh200->lock);
5037         fusbh200->enabled_hrtimer_events = 0;
5038         spin_unlock_irq(&fusbh200->lock);
5039 
5040         fusbh200_quiesce(fusbh200);
5041         fusbh200_silence_controller(fusbh200);
5042         fusbh200_reset (fusbh200);
5043 
5044         hrtimer_cancel(&fusbh200->hrtimer);
5045         remove_sysfs_files(fusbh200);
5046         remove_debug_files (fusbh200);
5047 
5048         /* root hub is shut down separately (first, when possible) */
5049         spin_lock_irq (&fusbh200->lock);
5050         end_free_itds(fusbh200);
5051         spin_unlock_irq (&fusbh200->lock);
5052         fusbh200_mem_cleanup (fusbh200);
5053 
5054         fusbh200_dbg(fusbh200, "irq normal %ld err %ld iaa %ld (lost %ld)\n",
5055                 fusbh200->stats.normal, fusbh200->stats.error, fusbh200->stats.iaa,
5056                 fusbh200->stats.lost_iaa);
5057         fusbh200_dbg (fusbh200, "complete %ld unlink %ld\n",
5058                 fusbh200->stats.complete, fusbh200->stats.unlink);
5059 
5060         dbg_status (fusbh200, "fusbh200_stop completed",
5061                     fusbh200_readl(fusbh200, &fusbh200->regs->status));
5062 }
5063 
5064 /* one-time init, only for memory state */
5065 static int hcd_fusbh200_init(struct usb_hcd *hcd)
5066 {
5067         struct fusbh200_hcd             *fusbh200 = hcd_to_fusbh200(hcd);
5068         u32                     temp;
5069         int                     retval;
5070         u32                     hcc_params;
5071         struct fusbh200_qh_hw   *hw;
5072 
5073         spin_lock_init(&fusbh200->lock);
5074 
5075         /*
5076          * keep io watchdog by default, those good HCDs could turn off it later
5077          */
5078         fusbh200->need_io_watchdog = 1;
5079 
5080         hrtimer_init(&fusbh200->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
5081         fusbh200->hrtimer.function = fusbh200_hrtimer_func;
5082         fusbh200->next_hrtimer_event = FUSBH200_HRTIMER_NO_EVENT;
5083 
5084         hcc_params = fusbh200_readl(fusbh200, &fusbh200->caps->hcc_params);
5085 
5086         /*
5087          * by default set standard 80% (== 100 usec/uframe) max periodic
5088          * bandwidth as required by USB 2.0
5089          */
5090         fusbh200->uframe_periodic_max = 100;
5091 
5092         /*
5093          * hw default: 1K periodic list heads, one per frame.
5094          * periodic_size can shrink by USBCMD update if hcc_params allows.
5095          */
5096         fusbh200->periodic_size = DEFAULT_I_TDPS;
5097         INIT_LIST_HEAD(&fusbh200->intr_qh_list);
5098         INIT_LIST_HEAD(&fusbh200->cached_itd_list);
5099 
5100         if (HCC_PGM_FRAMELISTLEN(hcc_params)) {
5101                 /* periodic schedule size can be smaller than default */
5102                 switch (FUSBH200_TUNE_FLS) {
5103                 case 0: fusbh200->periodic_size = 1024; break;
5104                 case 1: fusbh200->periodic_size = 512; break;
5105                 case 2: fusbh200->periodic_size = 256; break;
5106                 default:        BUG();
5107                 }
5108         }
5109         if ((retval = fusbh200_mem_init(fusbh200, GFP_KERNEL)) < 0)
5110                 return retval;
5111 
5112         /* controllers may cache some of the periodic schedule ... */
5113         fusbh200->i_thresh = 2;
5114 
5115         /*
5116          * dedicate a qh for the async ring head, since we couldn't unlink
5117          * a 'real' qh without stopping the async schedule [4.8].  use it
5118          * as the 'reclamation list head' too.
5119          * its dummy is used in hw_alt_next of many tds, to prevent the qh
5120          * from automatically advancing to the next td after short reads.
5121          */
5122         fusbh200->async->qh_next.qh = NULL;
5123         hw = fusbh200->async->hw;
5124         hw->hw_next = QH_NEXT(fusbh200, fusbh200->async->qh_dma);
5125         hw->hw_info1 = cpu_to_hc32(fusbh200, QH_HEAD);
5126         hw->hw_token = cpu_to_hc32(fusbh200, QTD_STS_HALT);
5127         hw->hw_qtd_next = FUSBH200_LIST_END(fusbh200);
5128         fusbh200->async->qh_state = QH_STATE_LINKED;
5129         hw->hw_alt_next = QTD_NEXT(fusbh200, fusbh200->async->dummy->qtd_dma);
5130 
5131         /* clear interrupt enables, set irq latency */
5132         if (log2_irq_thresh < 0 || log2_irq_thresh > 6)
5133                 log2_irq_thresh = 0;
5134         temp = 1 << (16 + log2_irq_thresh);
5135         if (HCC_CANPARK(hcc_params)) {
5136                 /* HW default park == 3, on hardware that supports it (like
5137                  * NVidia and ALI silicon), maximizes throughput on the async
5138                  * schedule by avoiding QH fetches between transfers.
5139                  *
5140                  * With fast usb storage devices and NForce2, "park" seems to
5141                  * make problems:  throughput reduction (!), data errors...
5142                  */
5143                 if (park) {
5144                         park = min(park, (unsigned) 3);
5145                         temp |= CMD_PARK;
5146                         temp |= park << 8;
5147                 }
5148                 fusbh200_dbg(fusbh200, "park %d\n", park);
5149         }
5150         if (HCC_PGM_FRAMELISTLEN(hcc_params)) {
5151                 /* periodic schedule size can be smaller than default */
5152                 temp &= ~(3 << 2);
5153                 temp |= (FUSBH200_TUNE_FLS << 2);
5154         }
5155         fusbh200->command = temp;
5156 
5157         /* Accept arbitrarily long scatter-gather lists */
5158         if (!(hcd->driver->flags & HCD_LOCAL_MEM))
5159                 hcd->self.sg_tablesize = ~0;
5160         return 0;
5161 }
5162 
5163 /* start HC running; it's halted, hcd_fusbh200_init() has been run (once) */
5164 static int fusbh200_run (struct usb_hcd *hcd)
5165 {
5166         struct fusbh200_hcd             *fusbh200 = hcd_to_fusbh200 (hcd);
5167         u32                     temp;
5168         u32                     hcc_params;
5169 
5170         hcd->uses_new_polling = 1;
5171 
5172         /* EHCI spec section 4.1 */
5173 
5174         fusbh200_writel(fusbh200, fusbh200->periodic_dma, &fusbh200->regs->frame_list);
5175         fusbh200_writel(fusbh200, (u32)fusbh200->async->qh_dma, &fusbh200->regs->async_next);
5176 
5177         /*
5178          * hcc_params controls whether fusbh200->regs->segment must (!!!)
5179          * be used; it constrains QH/ITD/SITD and QTD locations.
5180          * pci_pool consistent memory always uses segment zero.
5181          * streaming mappings for I/O buffers, like pci_map_single(),
5182          * can return segments above 4GB, if the device allows.
5183          *
5184          * NOTE:  the dma mask is visible through dma_supported(), so
5185          * drivers can pass this info along ... like NETIF_F_HIGHDMA,
5186          * Scsi_Host.highmem_io, and so forth.  It's readonly to all
5187          * host side drivers though.
5188          */
5189         hcc_params = fusbh200_readl(fusbh200, &fusbh200->caps->hcc_params);
5190 
5191         // Philips, Intel, and maybe others need CMD_RUN before the
5192         // root hub will detect new devices (why?); NEC doesn't
5193         fusbh200->command &= ~(CMD_IAAD|CMD_PSE|CMD_ASE|CMD_RESET);
5194         fusbh200->command |= CMD_RUN;
5195         fusbh200_writel(fusbh200, fusbh200->command, &fusbh200->regs->command);
5196         dbg_cmd (fusbh200, "init", fusbh200->command);
5197 
5198         /*
5199          * Start, enabling full USB 2.0 functionality ... usb 1.1 devices
5200          * are explicitly handed to companion controller(s), so no TT is
5201          * involved with the root hub.  (Except where one is integrated,
5202          * and there's no companion controller unless maybe for USB OTG.)
5203          *
5204          * Turning on the CF flag will transfer ownership of all ports
5205          * from the companions to the EHCI controller.  If any of the
5206          * companions are in the middle of a port reset at the time, it
5207          * could cause trouble.  Write-locking ehci_cf_port_reset_rwsem
5208          * guarantees that no resets are in progress.  After we set CF,
5209          * a short delay lets the hardware catch up; new resets shouldn't
5210          * be started before the port switching actions could complete.
5211          */
5212         down_write(&ehci_cf_port_reset_rwsem);
5213         fusbh200->rh_state = FUSBH200_RH_RUNNING;
5214         fusbh200_readl(fusbh200, &fusbh200->regs->command);     /* unblock posted writes */
5215         msleep(5);
5216         up_write(&ehci_cf_port_reset_rwsem);
5217         fusbh200->last_periodic_enable = ktime_get_real();
5218 
5219         temp = HC_VERSION(fusbh200, fusbh200_readl(fusbh200, &fusbh200->caps->hc_capbase));
5220         fusbh200_info (fusbh200,
5221                 "USB %x.%x started, EHCI %x.%02x\n",
5222                 ((fusbh200->sbrn & 0xf0)>>4), (fusbh200->sbrn & 0x0f),
5223                 temp >> 8, temp & 0xff);
5224 
5225         fusbh200_writel(fusbh200, INTR_MASK,
5226                     &fusbh200->regs->intr_enable); /* Turn On Interrupts */
5227 
5228         /* GRR this is run-once init(), being done every time the HC starts.
5229          * So long as they're part of class devices, we can't do it init()
5230          * since the class device isn't created that early.
5231          */
5232         create_debug_files(fusbh200);
5233         create_sysfs_files(fusbh200);
5234 
5235         return 0;
5236 }
5237 
5238 static int fusbh200_setup(struct usb_hcd *hcd)
5239 {
5240         struct fusbh200_hcd *fusbh200 = hcd_to_fusbh200(hcd);
5241         int retval;
5242 
5243         fusbh200->regs = (void __iomem *)fusbh200->caps +
5244             HC_LENGTH(fusbh200, fusbh200_readl(fusbh200, &fusbh200->caps->hc_capbase));
5245         dbg_hcs_params(fusbh200, "reset");
5246         dbg_hcc_params(fusbh200, "reset");
5247 
5248         /* cache this readonly data; minimize chip reads */
5249         fusbh200->hcs_params = fusbh200_readl(fusbh200, &fusbh200->caps->hcs_params);
5250 
5251         fusbh200->sbrn = HCD_USB2;
5252 
5253         /* data structure init */
5254         retval = hcd_fusbh200_init(hcd);
5255         if (retval)
5256                 return retval;
5257 
5258         retval = fusbh200_halt(fusbh200);
5259         if (retval)
5260                 return retval;
5261 
5262         fusbh200_reset(fusbh200);
5263 
5264         return 0;
5265 }
5266 
5267 /*-------------------------------------------------------------------------*/
5268 
5269 static irqreturn_t fusbh200_irq (struct usb_hcd *hcd)
5270 {
5271         struct fusbh200_hcd             *fusbh200 = hcd_to_fusbh200 (hcd);
5272         u32                     status, masked_status, pcd_status = 0, cmd;
5273         int                     bh;
5274 
5275         spin_lock (&fusbh200->lock);
5276 
5277         status = fusbh200_readl(fusbh200, &fusbh200->regs->status);
5278 
5279         /* e.g. cardbus physical eject */
5280         if (status == ~(u32) 0) {
5281                 fusbh200_dbg (fusbh200, "device removed\n");
5282                 goto dead;
5283         }
5284 
5285         /*
5286          * We don't use STS_FLR, but some controllers don't like it to
5287          * remain on, so mask it out along with the other status bits.
5288          */
5289         masked_status = status & (INTR_MASK | STS_FLR);
5290 
5291         /* Shared IRQ? */
5292         if (!masked_status || unlikely(fusbh200->rh_state == FUSBH200_RH_HALTED)) {
5293                 spin_unlock(&fusbh200->lock);
5294                 return IRQ_NONE;
5295         }
5296 
5297         /* clear (just) interrupts */
5298         fusbh200_writel(fusbh200, masked_status, &fusbh200->regs->status);
5299         cmd = fusbh200_readl(fusbh200, &fusbh200->regs->command);
5300         bh = 0;
5301 
5302         /* normal [4.15.1.2] or error [4.15.1.1] completion */
5303         if (likely ((status & (STS_INT|STS_ERR)) != 0)) {
5304                 if (likely ((status & STS_ERR) == 0))
5305                         COUNT (fusbh200->stats.normal);
5306                 else
5307                         COUNT (fusbh200->stats.error);
5308                 bh = 1;
5309         }
5310 
5311         /* complete the unlinking of some qh [4.15.2.3] */
5312         if (status & STS_IAA) {
5313 
5314                 /* Turn off the IAA watchdog */
5315                 fusbh200->enabled_hrtimer_events &= ~BIT(FUSBH200_HRTIMER_IAA_WATCHDOG);
5316 
5317                 /*
5318                  * Mild optimization: Allow another IAAD to reset the
5319                  * hrtimer, if one occurs before the next expiration.
5320                  * In theory we could always cancel the hrtimer, but
5321                  * tests show that about half the time it will be reset
5322                  * for some other event anyway.
5323                  */
5324                 if (fusbh200->next_hrtimer_event == FUSBH200_HRTIMER_IAA_WATCHDOG)
5325                         ++fusbh200->next_hrtimer_event;
5326 
5327                 /* guard against (alleged) silicon errata */
5328                 if (cmd & CMD_IAAD)
5329                         fusbh200_dbg(fusbh200, "IAA with IAAD still set?\n");
5330                 if (fusbh200->async_iaa) {
5331                         COUNT(fusbh200->stats.iaa);
5332                         end_unlink_async(fusbh200);
5333                 } else
5334                         fusbh200_dbg(fusbh200, "IAA with nothing unlinked?\n");
5335         }
5336 
5337         /* remote wakeup [4.3.1] */
5338         if (status & STS_PCD) {
5339                 int pstatus;
5340                 u32 __iomem *status_reg = &fusbh200->regs->port_status;
5341 
5342                 /* kick root hub later */
5343                 pcd_status = status;
5344 
5345                 /* resume root hub? */
5346                 if (fusbh200->rh_state == FUSBH200_RH_SUSPENDED)
5347                         usb_hcd_resume_root_hub(hcd);
5348 
5349                 pstatus = fusbh200_readl(fusbh200, status_reg);
5350 
5351                 if (test_bit(0, &fusbh200->suspended_ports) &&
5352                                 ((pstatus & PORT_RESUME) ||
5353                                         !(pstatus & PORT_SUSPEND)) &&
5354                                 (pstatus & PORT_PE) &&
5355                                 fusbh200->reset_done[0] == 0) {
5356 
5357                         /* start 20 msec resume signaling from this port,
5358                          * and make khubd collect PORT_STAT_C_SUSPEND to
5359                          * stop that signaling.  Use 5 ms extra for safety,
5360                          * like usb_port_resume() does.
5361                          */
5362                         fusbh200->reset_done[0] = jiffies + msecs_to_jiffies(25);
5363                         set_bit(0, &fusbh200->resuming_ports);
5364                         fusbh200_dbg (fusbh200, "port 1 remote wakeup\n");
5365                         mod_timer(&hcd->rh_timer, fusbh200->reset_done[0]);
5366                 }
5367         }
5368 
5369         /* PCI errors [4.15.2.4] */
5370         if (unlikely ((status & STS_FATAL) != 0)) {
5371                 fusbh200_err(fusbh200, "fatal error\n");
5372                 dbg_cmd(fusbh200, "fatal", cmd);
5373                 dbg_status(fusbh200, "fatal", status);
5374 dead:
5375                 usb_hc_died(hcd);
5376 
5377                 /* Don't let the controller do anything more */
5378                 fusbh200->shutdown = true;
5379                 fusbh200->rh_state = FUSBH200_RH_STOPPING;
5380                 fusbh200->command &= ~(CMD_RUN | CMD_ASE | CMD_PSE);
5381                 fusbh200_writel(fusbh200, fusbh200->command, &fusbh200->regs->command);
5382                 fusbh200_writel(fusbh200, 0, &fusbh200->regs->intr_enable);
5383                 fusbh200_handle_controller_death(fusbh200);
5384 
5385                 /* Handle completions when the controller stops */
5386                 bh = 0;
5387         }
5388 
5389         if (bh)
5390                 fusbh200_work (fusbh200);
5391         spin_unlock (&fusbh200->lock);
5392         if (pcd_status)
5393                 usb_hcd_poll_rh_status(hcd);
5394         return IRQ_HANDLED;
5395 }
5396 
5397 /*-------------------------------------------------------------------------*/
5398 
5399 /*
5400  * non-error returns are a promise to giveback() the urb later
5401  * we drop ownership so next owner (or urb unlink) can get it
5402  *
5403  * urb + dev is in hcd.self.controller.urb_list
5404  * we're queueing TDs onto software and hardware lists
5405  *
5406  * hcd-specific init for hcpriv hasn't been done yet
5407  *
5408  * NOTE:  control, bulk, and interrupt share the same code to append TDs
5409  * to a (possibly active) QH, and the same QH scanning code.
5410  */
5411 static int fusbh200_urb_enqueue (
5412         struct usb_hcd  *hcd,
5413         struct urb      *urb,
5414         gfp_t           mem_flags
5415 ) {
5416         struct fusbh200_hcd             *fusbh200 = hcd_to_fusbh200 (hcd);
5417         struct list_head        qtd_list;
5418 
5419         INIT_LIST_HEAD (&qtd_list);
5420 
5421         switch (usb_pipetype (urb->pipe)) {
5422         case PIPE_CONTROL:
5423                 /* qh_completions() code doesn't handle all the fault cases
5424                  * in multi-TD control transfers.  Even 1KB is rare anyway.
5425                  */
5426                 if (urb->transfer_buffer_length > (16 * 1024))
5427                         return -EMSGSIZE;
5428                 /* FALLTHROUGH */
5429         /* case PIPE_BULK: */
5430         default:
5431                 if (!qh_urb_transaction (fusbh200, urb, &qtd_list, mem_flags))
5432                         return -ENOMEM;
5433                 return submit_async(fusbh200, urb, &qtd_list, mem_flags);
5434 
5435         case PIPE_INTERRUPT:
5436                 if (!qh_urb_transaction (fusbh200, urb, &qtd_list, mem_flags))
5437                         return -ENOMEM;
5438                 return intr_submit(fusbh200, urb, &qtd_list, mem_flags);
5439 
5440         case PIPE_ISOCHRONOUS:
5441                 return itd_submit (fusbh200, urb, mem_flags);
5442         }
5443 }
5444 
5445 /* remove from hardware lists
5446  * completions normally happen asynchronously
5447  */
5448 
5449 static int fusbh200_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
5450 {
5451         struct fusbh200_hcd             *fusbh200 = hcd_to_fusbh200 (hcd);
5452         struct fusbh200_qh              *qh;
5453         unsigned long           flags;
5454         int                     rc;
5455 
5456         spin_lock_irqsave (&fusbh200->lock, flags);
5457         rc = usb_hcd_check_unlink_urb(hcd, urb, status);
5458         if (rc)
5459                 goto done;
5460 
5461         switch (usb_pipetype (urb->pipe)) {
5462         // case PIPE_CONTROL:
5463         // case PIPE_BULK:
5464         default:
5465                 qh = (struct fusbh200_qh *) urb->hcpriv;
5466                 if (!qh)
5467                         break;
5468                 switch (qh->qh_state) {
5469                 case QH_STATE_LINKED:
5470                 case QH_STATE_COMPLETING:
5471                         start_unlink_async(fusbh200, qh);
5472                         break;
5473                 case QH_STATE_UNLINK:
5474                 case QH_STATE_UNLINK_WAIT:
5475                         /* already started */
5476                         break;
5477                 case QH_STATE_IDLE:
5478                         /* QH might be waiting for a Clear-TT-Buffer */
5479                         qh_completions(fusbh200, qh);
5480                         break;
5481                 }
5482                 break;
5483 
5484         case PIPE_INTERRUPT:
5485                 qh = (struct fusbh200_qh *) urb->hcpriv;
5486                 if (!qh)
5487                         break;
5488                 switch (qh->qh_state) {
5489                 case QH_STATE_LINKED:
5490                 case QH_STATE_COMPLETING:
5491                         start_unlink_intr(fusbh200, qh);
5492                         break;
5493                 case QH_STATE_IDLE:
5494                         qh_completions (fusbh200, qh);
5495                         break;
5496                 default:
5497                         fusbh200_dbg (fusbh200, "bogus qh %p state %d\n",
5498                                         qh, qh->qh_state);
5499                         goto done;
5500                 }
5501                 break;
5502 
5503         case PIPE_ISOCHRONOUS:
5504                 // itd...
5505 
5506                 // wait till next completion, do it then.
5507                 // completion irqs can wait up to 1024 msec,
5508                 break;
5509         }
5510 done:
5511         spin_unlock_irqrestore (&fusbh200->lock, flags);
5512         return rc;
5513 }
5514 
5515 /*-------------------------------------------------------------------------*/
5516 
5517 // bulk qh holds the data toggle
5518 
5519 static void
5520 fusbh200_endpoint_disable (struct usb_hcd *hcd, struct usb_host_endpoint *ep)
5521 {
5522         struct fusbh200_hcd             *fusbh200 = hcd_to_fusbh200 (hcd);
5523         unsigned long           flags;
5524         struct fusbh200_qh              *qh, *tmp;
5525 
5526         /* ASSERT:  any requests/urbs are being unlinked */
5527         /* ASSERT:  nobody can be submitting urbs for this any more */
5528 
5529 rescan:
5530         spin_lock_irqsave (&fusbh200->lock, flags);
5531         qh = ep->hcpriv;
5532         if (!qh)
5533                 goto done;
5534 
5535         /* endpoints can be iso streams.  for now, we don't
5536          * accelerate iso completions ... so spin a while.
5537          */
5538         if (qh->hw == NULL) {
5539                 struct fusbh200_iso_stream      *stream = ep->hcpriv;
5540 
5541                 if (!list_empty(&stream->td_list))
5542                         goto idle_timeout;
5543 
5544                 /* BUG_ON(!list_empty(&stream->free_list)); */
5545                 kfree(stream);
5546                 goto done;
5547         }
5548 
5549         if (fusbh200->rh_state < FUSBH200_RH_RUNNING)
5550                 qh->qh_state = QH_STATE_IDLE;
5551         switch (qh->qh_state) {
5552         case QH_STATE_LINKED:
5553         case QH_STATE_COMPLETING:
5554                 for (tmp = fusbh200->async->qh_next.qh;
5555                                 tmp && tmp != qh;
5556                                 tmp = tmp->qh_next.qh)
5557                         continue;
5558                 /* periodic qh self-unlinks on empty, and a COMPLETING qh
5559                  * may already be unlinked.
5560                  */
5561                 if (tmp)
5562                         start_unlink_async(fusbh200, qh);
5563                 /* FALL THROUGH */
5564         case QH_STATE_UNLINK:           /* wait for hw to finish? */
5565         case QH_STATE_UNLINK_WAIT:
5566 idle_timeout:
5567                 spin_unlock_irqrestore (&fusbh200->lock, flags);
5568                 schedule_timeout_uninterruptible(1);
5569                 goto rescan;
5570         case QH_STATE_IDLE:             /* fully unlinked */
5571                 if (qh->clearing_tt)
5572                         goto idle_timeout;
5573                 if (list_empty (&qh->qtd_list)) {
5574                         qh_destroy(fusbh200, qh);
5575                         break;
5576                 }
5577                 /* else FALL THROUGH */
5578         default:
5579                 /* caller was supposed to have unlinked any requests;
5580                  * that's not our job.  just leak this memory.
5581                  */
5582                 fusbh200_err (fusbh200, "qh %p (#%02x) state %d%s\n",
5583                         qh, ep->desc.bEndpointAddress, qh->qh_state,
5584                         list_empty (&qh->qtd_list) ? "" : "(has tds)");
5585                 break;
5586         }
5587  done:
5588         ep->hcpriv = NULL;
5589         spin_unlock_irqrestore (&fusbh200->lock, flags);
5590 }
5591 
5592 static void
5593 fusbh200_endpoint_reset(struct usb_hcd *hcd, struct usb_host_endpoint *ep)
5594 {
5595         struct fusbh200_hcd             *fusbh200 = hcd_to_fusbh200(hcd);
5596         struct fusbh200_qh              *qh;
5597         int                     eptype = usb_endpoint_type(&ep->desc);
5598         int                     epnum = usb_endpoint_num(&ep->desc);
5599         int                     is_out = usb_endpoint_dir_out(&ep->desc);
5600         unsigned long           flags;
5601 
5602         if (eptype != USB_ENDPOINT_XFER_BULK && eptype != USB_ENDPOINT_XFER_INT)
5603                 return;
5604 
5605         spin_lock_irqsave(&fusbh200->lock, flags);
5606         qh = ep->hcpriv;
5607 
5608         /* For Bulk and Interrupt endpoints we maintain the toggle state
5609          * in the hardware; the toggle bits in udev aren't used at all.
5610          * When an endpoint is reset by usb_clear_halt() we must reset
5611          * the toggle bit in the QH.
5612          */
5613         if (qh) {
5614                 usb_settoggle(qh->dev, epnum, is_out, 0);
5615                 if (!list_empty(&qh->qtd_list)) {
5616                         WARN_ONCE(1, "clear_halt for a busy endpoint\n");
5617                 } else if (qh->qh_state == QH_STATE_LINKED ||
5618                                 qh->qh_state == QH_STATE_COMPLETING) {
5619 
5620                         /* The toggle value in the QH can't be updated
5621                          * while the QH is active.  Unlink it now;
5622                          * re-linking will call qh_refresh().
5623                          */
5624                         if (eptype == USB_ENDPOINT_XFER_BULK)
5625                                 start_unlink_async(fusbh200, qh);
5626                         else
5627                                 start_unlink_intr(fusbh200, qh);
5628                 }
5629         }
5630         spin_unlock_irqrestore(&fusbh200->lock, flags);
5631 }
5632 
5633 static int fusbh200_get_frame (struct usb_hcd *hcd)
5634 {
5635         struct fusbh200_hcd             *fusbh200 = hcd_to_fusbh200 (hcd);
5636         return (fusbh200_read_frame_index(fusbh200) >> 3) % fusbh200->periodic_size;
5637 }
5638 
5639 /*-------------------------------------------------------------------------*/
5640 
5641 /*
5642  * The EHCI in ChipIdea HDRC cannot be a separate module or device,
5643  * because its registers (and irq) are shared between host/gadget/otg
5644  * functions  and in order to facilitate role switching we cannot
5645  * give the fusbh200 driver exclusive access to those.
5646  */
5647 MODULE_DESCRIPTION(DRIVER_DESC);
5648 MODULE_AUTHOR (DRIVER_AUTHOR);
5649 MODULE_LICENSE ("GPL");
5650 
5651 static const struct hc_driver fusbh200_fusbh200_hc_driver = {
5652         .description            = hcd_name,
5653         .product_desc           = "Faraday USB2.0 Host Controller",
5654         .hcd_priv_size          = sizeof(struct fusbh200_hcd),
5655 
5656         /*
5657          * generic hardware linkage
5658          */
5659         .irq                    = fusbh200_irq,
5660         .flags                  = HCD_MEMORY | HCD_USB2,
5661 
5662         /*
5663          * basic lifecycle operations
5664          */
5665         .reset                  = hcd_fusbh200_init,
5666         .start                  = fusbh200_run,
5667         .stop                   = fusbh200_stop,
5668         .shutdown               = fusbh200_shutdown,
5669 
5670         /*
5671          * managing i/o requests and associated device resources
5672          */
5673         .urb_enqueue            = fusbh200_urb_enqueue,
5674         .urb_dequeue            = fusbh200_urb_dequeue,
5675         .endpoint_disable       = fusbh200_endpoint_disable,
5676         .endpoint_reset         = fusbh200_endpoint_reset,
5677 
5678         /*
5679          * scheduling support
5680          */
5681         .get_frame_number       = fusbh200_get_frame,
5682 
5683         /*
5684          * root hub support
5685          */
5686         .hub_status_data        = fusbh200_hub_status_data,
5687         .hub_control            = fusbh200_hub_control,
5688         .bus_suspend            = fusbh200_bus_suspend,
5689         .bus_resume             = fusbh200_bus_resume,
5690 
5691         .relinquish_port        = fusbh200_relinquish_port,
5692         .port_handed_over       = fusbh200_port_handed_over,
5693 
5694         .clear_tt_buffer_complete = fusbh200_clear_tt_buffer_complete,
5695 };
5696 
5697 static void fusbh200_init(struct fusbh200_hcd *fusbh200)
5698 {
5699         u32 reg;
5700 
5701         reg = fusbh200_readl(fusbh200, &fusbh200->regs->bmcsr);
5702         reg |= BMCSR_INT_POLARITY;
5703         reg &= ~BMCSR_VBUS_OFF;
5704         fusbh200_writel(fusbh200, reg, &fusbh200->regs->bmcsr);
5705 
5706         reg = fusbh200_readl(fusbh200, &fusbh200->regs->bmier);
5707         fusbh200_writel(fusbh200, reg | BMIER_OVC_EN | BMIER_VBUS_ERR_EN,
5708                 &fusbh200->regs->bmier);
5709 }
5710 
5711 /**
5712  * fusbh200_hcd_probe - initialize faraday FUSBH200 HCDs
5713  *
5714  * Allocates basic resources for this USB host controller, and
5715  * then invokes the start() method for the HCD associated with it
5716  * through the hotplug entry's driver_data.
5717  */
5718 static int fusbh200_hcd_probe(struct platform_device *pdev)
5719 {
5720         struct device                   *dev = &pdev->dev;
5721         struct usb_hcd                  *hcd;
5722         struct resource                 *res;
5723         int                             irq;
5724         int                             retval = -ENODEV;
5725         struct fusbh200_hcd             *fusbh200;
5726 
5727         if (usb_disabled())
5728                 return -ENODEV;
5729 
5730         pdev->dev.power.power_state = PMSG_ON;
5731 
5732         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
5733         if (!res) {
5734                 dev_err(dev,
5735                         "Found HC with no IRQ. Check %s setup!\n",
5736                         dev_name(dev));
5737                 return -ENODEV;
5738         }
5739 
5740         irq = res->start;
5741 
5742         hcd = usb_create_hcd(&fusbh200_fusbh200_hc_driver, dev,
5743                         dev_name(dev));
5744         if (!hcd) {
5745                 dev_err(dev, "failed to create hcd with err %d\n", retval);
5746                 retval = -ENOMEM;
5747                 goto fail_create_hcd;
5748         }
5749 
5750         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
5751         if (!res) {
5752                 dev_err(dev,
5753                         "Found HC with no register addr. Check %s setup!\n",
5754                         dev_name(dev));
5755                 retval = -ENODEV;
5756                 goto fail_request_resource;
5757         }
5758 
5759         hcd->rsrc_start = res->start;
5760         hcd->rsrc_len = resource_size(res);
5761         hcd->has_tt = 1;
5762 
5763         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
5764                                 fusbh200_fusbh200_hc_driver.description)) {
5765                 dev_dbg(dev, "controller already in use\n");
5766                 retval = -EBUSY;
5767                 goto fail_request_resource;
5768         }
5769 
5770         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
5771         if (!res) {
5772                 dev_err(dev,
5773                         "Found HC with no register addr. Check %s setup!\n",
5774                         dev_name(dev));
5775                 retval = -ENODEV;
5776                 goto fail_request_resource;
5777         }
5778 
5779         hcd->regs = ioremap_nocache(res->start, resource_size(res));
5780         if (hcd->regs == NULL) {
5781                 dev_dbg(dev, "error mapping memory\n");
5782                 retval = -EFAULT;
5783                 goto fail_ioremap;
5784         }
5785 
5786         fusbh200 = hcd_to_fusbh200(hcd);
5787 
5788         fusbh200->caps = hcd->regs;
5789 
5790         retval = fusbh200_setup(hcd);
5791         if (retval)
5792                 goto fail_add_hcd;
5793 
5794         fusbh200_init(fusbh200);
5795 
5796         retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
5797         if (retval) {
5798                 dev_err(dev, "failed to add hcd with err %d\n", retval);
5799                 goto fail_add_hcd;
5800         }
5801         device_wakeup_enable(hcd->self.controller);
5802 
5803         return retval;
5804 
5805 fail_add_hcd:
5806         iounmap(hcd->regs);
5807 fail_ioremap:
5808         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
5809 fail_request_resource:
5810         usb_put_hcd(hcd);
5811 fail_create_hcd:
5812         dev_err(dev, "init %s fail, %d\n", dev_name(dev), retval);
5813         return retval;
5814 }
5815 
5816 /**
5817  * fusbh200_hcd_remove - shutdown processing for EHCI HCDs
5818  * @dev: USB Host Controller being removed
5819  *
5820  * Reverses the effect of fotg2xx_usb_hcd_probe(), first invoking
5821  * the HCD's stop() method.  It is always called from a thread
5822  * context, normally "rmmod", "apmd", or something similar.
5823  */
5824 static int fusbh200_hcd_remove(struct platform_device *pdev)
5825 {
5826         struct device *dev      = &pdev->dev;
5827         struct usb_hcd *hcd     = dev_get_drvdata(dev);
5828 
5829         if (!hcd)
5830                 return 0;
5831 
5832         usb_remove_hcd(hcd);
5833         iounmap(hcd->regs);
5834         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
5835         usb_put_hcd(hcd);
5836 
5837         return 0;
5838 }
5839 
5840 static struct platform_driver fusbh200_hcd_fusbh200_driver = {
5841         .driver = {
5842                 .name   = "fusbh200",
5843         },
5844         .probe  = fusbh200_hcd_probe,
5845         .remove = fusbh200_hcd_remove,
5846 };
5847 
5848 static int __init fusbh200_hcd_init(void)
5849 {
5850         int retval = 0;
5851 
5852         if (usb_disabled())
5853                 return -ENODEV;
5854 
5855         printk(KERN_INFO "%s: " DRIVER_DESC "\n", hcd_name);
5856         set_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
5857         if (test_bit(USB_UHCI_LOADED, &usb_hcds_loaded) ||
5858                         test_bit(USB_OHCI_LOADED, &usb_hcds_loaded))
5859                 printk(KERN_WARNING "Warning! fusbh200_hcd should always be loaded"
5860                                 " before uhci_hcd and ohci_hcd, not after\n");
5861 
5862         pr_debug("%s: block sizes: qh %Zd qtd %Zd itd %Zd\n",
5863                  hcd_name,
5864                  sizeof(struct fusbh200_qh), sizeof(struct fusbh200_qtd),
5865                  sizeof(struct fusbh200_itd));
5866 
5867         fusbh200_debug_root = debugfs_create_dir("fusbh200", usb_debug_root);
5868         if (!fusbh200_debug_root) {
5869                 retval = -ENOENT;
5870                 goto err_debug;
5871         }
5872 
5873         retval = platform_driver_register(&fusbh200_hcd_fusbh200_driver);
5874         if (retval < 0)
5875                 goto clean;
5876         return retval;
5877 
5878         platform_driver_unregister(&fusbh200_hcd_fusbh200_driver);
5879 clean:
5880         debugfs_remove(fusbh200_debug_root);
5881         fusbh200_debug_root = NULL;
5882 err_debug:
5883         clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
5884         return retval;
5885 }
5886 module_init(fusbh200_hcd_init);
5887 
5888 static void __exit fusbh200_hcd_cleanup(void)
5889 {
5890         platform_driver_unregister(&fusbh200_hcd_fusbh200_driver);
5891         debugfs_remove(fusbh200_debug_root);
5892         clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
5893 }
5894 module_exit(fusbh200_hcd_cleanup);
5895 

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