Version:  2.0.40 2.2.26 2.4.37 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 3.18 3.19 4.0 4.1

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 hub_wq 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 = USB_DT_HUB;
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 = HUB_CHAR_INDV_PORT_OCPM; /* per-port overcurrent reporting */
1483         temp |= HUB_CHAR_NO_LPSM;       /* 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, hub_wq 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                         fusbh200_writel(fusbh200, temp | PORT_RESUME, status_reg);
1554                         fusbh200->reset_done[wIndex] = jiffies
1555                                         + msecs_to_jiffies(USB_RESUME_TIMEOUT);
1556                         break;
1557                 case USB_PORT_FEAT_C_SUSPEND:
1558                         clear_bit(wIndex, &fusbh200->port_c_suspend);
1559                         break;
1560                 case USB_PORT_FEAT_C_CONNECTION:
1561                         fusbh200_writel(fusbh200, temp | PORT_CSC, status_reg);
1562                         break;
1563                 case USB_PORT_FEAT_C_OVER_CURRENT:
1564                         fusbh200_writel(fusbh200, temp | BMISR_OVC, &fusbh200->regs->bmisr);
1565                         break;
1566                 case USB_PORT_FEAT_C_RESET:
1567                         /* GetPortStatus clears reset */
1568                         break;
1569                 default:
1570                         goto error;
1571                 }
1572                 fusbh200_readl(fusbh200, &fusbh200->regs->command);     /* unblock posted write */
1573                 break;
1574         case GetHubDescriptor:
1575                 fusbh200_hub_descriptor (fusbh200, (struct usb_hub_descriptor *)
1576                         buf);
1577                 break;
1578         case GetHubStatus:
1579                 /* no hub-wide feature/status flags */
1580                 memset (buf, 0, 4);
1581                 //cpu_to_le32s ((u32 *) buf);
1582                 break;
1583         case GetPortStatus:
1584                 if (!wIndex || wIndex > ports)
1585                         goto error;
1586                 wIndex--;
1587                 status = 0;
1588                 temp = fusbh200_readl(fusbh200, status_reg);
1589 
1590                 // wPortChange bits
1591                 if (temp & PORT_CSC)
1592                         status |= USB_PORT_STAT_C_CONNECTION << 16;
1593                 if (temp & PORT_PEC)
1594                         status |= USB_PORT_STAT_C_ENABLE << 16;
1595 
1596                 temp1 = fusbh200_readl(fusbh200, &fusbh200->regs->bmisr);
1597                 if (temp1 & BMISR_OVC)
1598                         status |= USB_PORT_STAT_C_OVERCURRENT << 16;
1599 
1600                 /* whoever resumes must GetPortStatus to complete it!! */
1601                 if (temp & PORT_RESUME) {
1602 
1603                         /* Remote Wakeup received? */
1604                         if (!fusbh200->reset_done[wIndex]) {
1605                                 /* resume signaling for 20 msec */
1606                                 fusbh200->reset_done[wIndex] = jiffies
1607                                                 + msecs_to_jiffies(20);
1608                                 /* check the port again */
1609                                 mod_timer(&fusbh200_to_hcd(fusbh200)->rh_timer,
1610                                                 fusbh200->reset_done[wIndex]);
1611                         }
1612 
1613                         /* resume completed? */
1614                         else if (time_after_eq(jiffies,
1615                                         fusbh200->reset_done[wIndex])) {
1616                                 clear_bit(wIndex, &fusbh200->suspended_ports);
1617                                 set_bit(wIndex, &fusbh200->port_c_suspend);
1618                                 fusbh200->reset_done[wIndex] = 0;
1619 
1620                                 /* stop resume signaling */
1621                                 temp = fusbh200_readl(fusbh200, status_reg);
1622                                 fusbh200_writel(fusbh200,
1623                                         temp & ~(PORT_RWC_BITS | PORT_RESUME),
1624                                         status_reg);
1625                                 clear_bit(wIndex, &fusbh200->resuming_ports);
1626                                 retval = handshake(fusbh200, status_reg,
1627                                            PORT_RESUME, 0, 2000 /* 2msec */);
1628                                 if (retval != 0) {
1629                                         fusbh200_err(fusbh200,
1630                                                 "port %d resume error %d\n",
1631                                                 wIndex + 1, retval);
1632                                         goto error;
1633                                 }
1634                                 temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10));
1635                         }
1636                 }
1637 
1638                 /* whoever resets must GetPortStatus to complete it!! */
1639                 if ((temp & PORT_RESET)
1640                                 && time_after_eq(jiffies,
1641                                         fusbh200->reset_done[wIndex])) {
1642                         status |= USB_PORT_STAT_C_RESET << 16;
1643                         fusbh200->reset_done [wIndex] = 0;
1644                         clear_bit(wIndex, &fusbh200->resuming_ports);
1645 
1646                         /* force reset to complete */
1647                         fusbh200_writel(fusbh200, temp & ~(PORT_RWC_BITS | PORT_RESET),
1648                                         status_reg);
1649                         /* REVISIT:  some hardware needs 550+ usec to clear
1650                          * this bit; seems too long to spin routinely...
1651                          */
1652                         retval = handshake(fusbh200, status_reg,
1653                                         PORT_RESET, 0, 1000);
1654                         if (retval != 0) {
1655                                 fusbh200_err (fusbh200, "port %d reset error %d\n",
1656                                         wIndex + 1, retval);
1657                                 goto error;
1658                         }
1659 
1660                         /* see what we found out */
1661                         temp = check_reset_complete (fusbh200, wIndex, status_reg,
1662                                         fusbh200_readl(fusbh200, status_reg));
1663                 }
1664 
1665                 if (!(temp & (PORT_RESUME|PORT_RESET))) {
1666                         fusbh200->reset_done[wIndex] = 0;
1667                         clear_bit(wIndex, &fusbh200->resuming_ports);
1668                 }
1669 
1670                 /* transfer dedicated ports to the companion hc */
1671                 if ((temp & PORT_CONNECT) &&
1672                                 test_bit(wIndex, &fusbh200->companion_ports)) {
1673                         temp &= ~PORT_RWC_BITS;
1674                         fusbh200_writel(fusbh200, temp, status_reg);
1675                         fusbh200_dbg(fusbh200, "port %d --> companion\n", wIndex + 1);
1676                         temp = fusbh200_readl(fusbh200, status_reg);
1677                 }
1678 
1679                 /*
1680                  * Even if OWNER is set, there's no harm letting hub_wq
1681                  * see the wPortStatus values (they should all be 0 except
1682                  * for PORT_POWER anyway).
1683                  */
1684 
1685                 if (temp & PORT_CONNECT) {
1686                         status |= USB_PORT_STAT_CONNECTION;
1687                         status |= fusbh200_port_speed(fusbh200, temp);
1688                 }
1689                 if (temp & PORT_PE)
1690                         status |= USB_PORT_STAT_ENABLE;
1691 
1692                 /* maybe the port was unsuspended without our knowledge */
1693                 if (temp & (PORT_SUSPEND|PORT_RESUME)) {
1694                         status |= USB_PORT_STAT_SUSPEND;
1695                 } else if (test_bit(wIndex, &fusbh200->suspended_ports)) {
1696                         clear_bit(wIndex, &fusbh200->suspended_ports);
1697                         clear_bit(wIndex, &fusbh200->resuming_ports);
1698                         fusbh200->reset_done[wIndex] = 0;
1699                         if (temp & PORT_PE)
1700                                 set_bit(wIndex, &fusbh200->port_c_suspend);
1701                 }
1702 
1703                 temp1 = fusbh200_readl(fusbh200, &fusbh200->regs->bmisr);
1704                 if (temp1 & BMISR_OVC)
1705                         status |= USB_PORT_STAT_OVERCURRENT;
1706                 if (temp & PORT_RESET)
1707                         status |= USB_PORT_STAT_RESET;
1708                 if (test_bit(wIndex, &fusbh200->port_c_suspend))
1709                         status |= USB_PORT_STAT_C_SUSPEND << 16;
1710 
1711                 if (status & ~0xffff)   /* only if wPortChange is interesting */
1712                         dbg_port(fusbh200, "GetStatus", wIndex + 1, temp);
1713                 put_unaligned_le32(status, buf);
1714                 break;
1715         case SetHubFeature:
1716                 switch (wValue) {
1717                 case C_HUB_LOCAL_POWER:
1718                 case C_HUB_OVER_CURRENT:
1719                         /* no hub-wide feature/status flags */
1720                         break;
1721                 default:
1722                         goto error;
1723                 }
1724                 break;
1725         case SetPortFeature:
1726                 selector = wIndex >> 8;
1727                 wIndex &= 0xff;
1728 
1729                 if (!wIndex || wIndex > ports)
1730                         goto error;
1731                 wIndex--;
1732                 temp = fusbh200_readl(fusbh200, status_reg);
1733                 temp &= ~PORT_RWC_BITS;
1734                 switch (wValue) {
1735                 case USB_PORT_FEAT_SUSPEND:
1736                         if ((temp & PORT_PE) == 0
1737                                         || (temp & PORT_RESET) != 0)
1738                                 goto error;
1739 
1740                         /* After above check the port must be connected.
1741                          * Set appropriate bit thus could put phy into low power
1742                          * mode if we have hostpc feature
1743                          */
1744                         fusbh200_writel(fusbh200, temp | PORT_SUSPEND, status_reg);
1745                         set_bit(wIndex, &fusbh200->suspended_ports);
1746                         break;
1747                 case USB_PORT_FEAT_RESET:
1748                         if (temp & PORT_RESUME)
1749                                 goto error;
1750                         /* line status bits may report this as low speed,
1751                          * which can be fine if this root hub has a
1752                          * transaction translator built in.
1753                          */
1754                         fusbh200_dbg(fusbh200, "port %d reset\n", wIndex + 1);
1755                         temp |= PORT_RESET;
1756                         temp &= ~PORT_PE;
1757 
1758                         /*
1759                          * caller must wait, then call GetPortStatus
1760                          * usb 2.0 spec says 50 ms resets on root
1761                          */
1762                         fusbh200->reset_done [wIndex] = jiffies
1763                                         + msecs_to_jiffies (50);
1764                         fusbh200_writel(fusbh200, temp, status_reg);
1765                         break;
1766 
1767                 /* For downstream facing ports (these):  one hub port is put
1768                  * into test mode according to USB2 11.24.2.13, then the hub
1769                  * must be reset (which for root hub now means rmmod+modprobe,
1770                  * or else system reboot).  See EHCI 2.3.9 and 4.14 for info
1771                  * about the EHCI-specific stuff.
1772                  */
1773                 case USB_PORT_FEAT_TEST:
1774                         if (!selector || selector > 5)
1775                                 goto error;
1776                         spin_unlock_irqrestore(&fusbh200->lock, flags);
1777                         fusbh200_quiesce(fusbh200);
1778                         spin_lock_irqsave(&fusbh200->lock, flags);
1779 
1780                         /* Put all enabled ports into suspend */
1781                         temp = fusbh200_readl(fusbh200, status_reg) & ~PORT_RWC_BITS;
1782                         if (temp & PORT_PE)
1783                                 fusbh200_writel(fusbh200, temp | PORT_SUSPEND,
1784                                                 status_reg);
1785 
1786                         spin_unlock_irqrestore(&fusbh200->lock, flags);
1787                         fusbh200_halt(fusbh200);
1788                         spin_lock_irqsave(&fusbh200->lock, flags);
1789 
1790                         temp = fusbh200_readl(fusbh200, status_reg);
1791                         temp |= selector << 16;
1792                         fusbh200_writel(fusbh200, temp, status_reg);
1793                         break;
1794 
1795                 default:
1796                         goto error;
1797                 }
1798                 fusbh200_readl(fusbh200, &fusbh200->regs->command);     /* unblock posted writes */
1799                 break;
1800 
1801         default:
1802 error:
1803                 /* "stall" on error */
1804                 retval = -EPIPE;
1805         }
1806         spin_unlock_irqrestore (&fusbh200->lock, flags);
1807         return retval;
1808 }
1809 
1810 static void __maybe_unused fusbh200_relinquish_port(struct usb_hcd *hcd,
1811                 int portnum)
1812 {
1813         return;
1814 }
1815 
1816 static int __maybe_unused fusbh200_port_handed_over(struct usb_hcd *hcd,
1817                 int portnum)
1818 {
1819         return 0;
1820 }
1821 /*-------------------------------------------------------------------------*/
1822 /*
1823  * There's basically three types of memory:
1824  *      - data used only by the HCD ... kmalloc is fine
1825  *      - async and periodic schedules, shared by HC and HCD ... these
1826  *        need to use dma_pool or dma_alloc_coherent
1827  *      - driver buffers, read/written by HC ... single shot DMA mapped
1828  *
1829  * There's also "register" data (e.g. PCI or SOC), which is memory mapped.
1830  * No memory seen by this driver is pageable.
1831  */
1832 
1833 /*-------------------------------------------------------------------------*/
1834 
1835 /* Allocate the key transfer structures from the previously allocated pool */
1836 
1837 static inline void fusbh200_qtd_init(struct fusbh200_hcd *fusbh200, struct fusbh200_qtd *qtd,
1838                                   dma_addr_t dma)
1839 {
1840         memset (qtd, 0, sizeof *qtd);
1841         qtd->qtd_dma = dma;
1842         qtd->hw_token = cpu_to_hc32(fusbh200, QTD_STS_HALT);
1843         qtd->hw_next = FUSBH200_LIST_END(fusbh200);
1844         qtd->hw_alt_next = FUSBH200_LIST_END(fusbh200);
1845         INIT_LIST_HEAD (&qtd->qtd_list);
1846 }
1847 
1848 static struct fusbh200_qtd *fusbh200_qtd_alloc (struct fusbh200_hcd *fusbh200, gfp_t flags)
1849 {
1850         struct fusbh200_qtd             *qtd;
1851         dma_addr_t              dma;
1852 
1853         qtd = dma_pool_alloc (fusbh200->qtd_pool, flags, &dma);
1854         if (qtd != NULL) {
1855                 fusbh200_qtd_init(fusbh200, qtd, dma);
1856         }
1857         return qtd;
1858 }
1859 
1860 static inline void fusbh200_qtd_free (struct fusbh200_hcd *fusbh200, struct fusbh200_qtd *qtd)
1861 {
1862         dma_pool_free (fusbh200->qtd_pool, qtd, qtd->qtd_dma);
1863 }
1864 
1865 
1866 static void qh_destroy(struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh)
1867 {
1868         /* clean qtds first, and know this is not linked */
1869         if (!list_empty (&qh->qtd_list) || qh->qh_next.ptr) {
1870                 fusbh200_dbg (fusbh200, "unused qh not empty!\n");
1871                 BUG ();
1872         }
1873         if (qh->dummy)
1874                 fusbh200_qtd_free (fusbh200, qh->dummy);
1875         dma_pool_free(fusbh200->qh_pool, qh->hw, qh->qh_dma);
1876         kfree(qh);
1877 }
1878 
1879 static struct fusbh200_qh *fusbh200_qh_alloc (struct fusbh200_hcd *fusbh200, gfp_t flags)
1880 {
1881         struct fusbh200_qh              *qh;
1882         dma_addr_t              dma;
1883 
1884         qh = kzalloc(sizeof *qh, GFP_ATOMIC);
1885         if (!qh)
1886                 goto done;
1887         qh->hw = (struct fusbh200_qh_hw *)
1888                 dma_pool_alloc(fusbh200->qh_pool, flags, &dma);
1889         if (!qh->hw)
1890                 goto fail;
1891         memset(qh->hw, 0, sizeof *qh->hw);
1892         qh->qh_dma = dma;
1893         // INIT_LIST_HEAD (&qh->qh_list);
1894         INIT_LIST_HEAD (&qh->qtd_list);
1895 
1896         /* dummy td enables safe urb queuing */
1897         qh->dummy = fusbh200_qtd_alloc (fusbh200, flags);
1898         if (qh->dummy == NULL) {
1899                 fusbh200_dbg (fusbh200, "no dummy td\n");
1900                 goto fail1;
1901         }
1902 done:
1903         return qh;
1904 fail1:
1905         dma_pool_free(fusbh200->qh_pool, qh->hw, qh->qh_dma);
1906 fail:
1907         kfree(qh);
1908         return NULL;
1909 }
1910 
1911 /*-------------------------------------------------------------------------*/
1912 
1913 /* The queue heads and transfer descriptors are managed from pools tied
1914  * to each of the "per device" structures.
1915  * This is the initialisation and cleanup code.
1916  */
1917 
1918 static void fusbh200_mem_cleanup (struct fusbh200_hcd *fusbh200)
1919 {
1920         if (fusbh200->async)
1921                 qh_destroy(fusbh200, fusbh200->async);
1922         fusbh200->async = NULL;
1923 
1924         if (fusbh200->dummy)
1925                 qh_destroy(fusbh200, fusbh200->dummy);
1926         fusbh200->dummy = NULL;
1927 
1928         /* DMA consistent memory and pools */
1929         if (fusbh200->qtd_pool)
1930                 dma_pool_destroy (fusbh200->qtd_pool);
1931         fusbh200->qtd_pool = NULL;
1932 
1933         if (fusbh200->qh_pool) {
1934                 dma_pool_destroy (fusbh200->qh_pool);
1935                 fusbh200->qh_pool = NULL;
1936         }
1937 
1938         if (fusbh200->itd_pool)
1939                 dma_pool_destroy (fusbh200->itd_pool);
1940         fusbh200->itd_pool = NULL;
1941 
1942         if (fusbh200->periodic)
1943                 dma_free_coherent (fusbh200_to_hcd(fusbh200)->self.controller,
1944                         fusbh200->periodic_size * sizeof (u32),
1945                         fusbh200->periodic, fusbh200->periodic_dma);
1946         fusbh200->periodic = NULL;
1947 
1948         /* shadow periodic table */
1949         kfree(fusbh200->pshadow);
1950         fusbh200->pshadow = NULL;
1951 }
1952 
1953 /* remember to add cleanup code (above) if you add anything here */
1954 static int fusbh200_mem_init (struct fusbh200_hcd *fusbh200, gfp_t flags)
1955 {
1956         int i;
1957 
1958         /* QTDs for control/bulk/intr transfers */
1959         fusbh200->qtd_pool = dma_pool_create ("fusbh200_qtd",
1960                         fusbh200_to_hcd(fusbh200)->self.controller,
1961                         sizeof (struct fusbh200_qtd),
1962                         32 /* byte alignment (for hw parts) */,
1963                         4096 /* can't cross 4K */);
1964         if (!fusbh200->qtd_pool) {
1965                 goto fail;
1966         }
1967 
1968         /* QHs for control/bulk/intr transfers */
1969         fusbh200->qh_pool = dma_pool_create ("fusbh200_qh",
1970                         fusbh200_to_hcd(fusbh200)->self.controller,
1971                         sizeof(struct fusbh200_qh_hw),
1972                         32 /* byte alignment (for hw parts) */,
1973                         4096 /* can't cross 4K */);
1974         if (!fusbh200->qh_pool) {
1975                 goto fail;
1976         }
1977         fusbh200->async = fusbh200_qh_alloc (fusbh200, flags);
1978         if (!fusbh200->async) {
1979                 goto fail;
1980         }
1981 
1982         /* ITD for high speed ISO transfers */
1983         fusbh200->itd_pool = dma_pool_create ("fusbh200_itd",
1984                         fusbh200_to_hcd(fusbh200)->self.controller,
1985                         sizeof (struct fusbh200_itd),
1986                         64 /* byte alignment (for hw parts) */,
1987                         4096 /* can't cross 4K */);
1988         if (!fusbh200->itd_pool) {
1989                 goto fail;
1990         }
1991 
1992         /* Hardware periodic table */
1993         fusbh200->periodic = (__le32 *)
1994                 dma_alloc_coherent (fusbh200_to_hcd(fusbh200)->self.controller,
1995                         fusbh200->periodic_size * sizeof(__le32),
1996                         &fusbh200->periodic_dma, 0);
1997         if (fusbh200->periodic == NULL) {
1998                 goto fail;
1999         }
2000 
2001                 for (i = 0; i < fusbh200->periodic_size; i++)
2002                         fusbh200->periodic[i] = FUSBH200_LIST_END(fusbh200);
2003 
2004         /* software shadow of hardware table */
2005         fusbh200->pshadow = kcalloc(fusbh200->periodic_size, sizeof(void *), flags);
2006         if (fusbh200->pshadow != NULL)
2007                 return 0;
2008 
2009 fail:
2010         fusbh200_dbg (fusbh200, "couldn't init memory\n");
2011         fusbh200_mem_cleanup (fusbh200);
2012         return -ENOMEM;
2013 }
2014 /*-------------------------------------------------------------------------*/
2015 /*
2016  * EHCI hardware queue manipulation ... the core.  QH/QTD manipulation.
2017  *
2018  * Control, bulk, and interrupt traffic all use "qh" lists.  They list "qtd"
2019  * entries describing USB transactions, max 16-20kB/entry (with 4kB-aligned
2020  * buffers needed for the larger number).  We use one QH per endpoint, queue
2021  * multiple urbs (all three types) per endpoint.  URBs may need several qtds.
2022  *
2023  * ISO traffic uses "ISO TD" (itd) records, and (along with
2024  * interrupts) needs careful scheduling.  Performance improvements can be
2025  * an ongoing challenge.  That's in "ehci-sched.c".
2026  *
2027  * USB 1.1 devices are handled (a) by "companion" OHCI or UHCI root hubs,
2028  * or otherwise through transaction translators (TTs) in USB 2.0 hubs using
2029  * (b) special fields in qh entries or (c) split iso entries.  TTs will
2030  * buffer low/full speed data so the host collects it at high speed.
2031  */
2032 
2033 /*-------------------------------------------------------------------------*/
2034 
2035 /* fill a qtd, returning how much of the buffer we were able to queue up */
2036 
2037 static int
2038 qtd_fill(struct fusbh200_hcd *fusbh200, struct fusbh200_qtd *qtd, dma_addr_t buf,
2039                   size_t len, int token, int maxpacket)
2040 {
2041         int     i, count;
2042         u64     addr = buf;
2043 
2044         /* one buffer entry per 4K ... first might be short or unaligned */
2045         qtd->hw_buf[0] = cpu_to_hc32(fusbh200, (u32)addr);
2046         qtd->hw_buf_hi[0] = cpu_to_hc32(fusbh200, (u32)(addr >> 32));
2047         count = 0x1000 - (buf & 0x0fff);        /* rest of that page */
2048         if (likely (len < count))               /* ... iff needed */
2049                 count = len;
2050         else {
2051                 buf +=  0x1000;
2052                 buf &= ~0x0fff;
2053 
2054                 /* per-qtd limit: from 16K to 20K (best alignment) */
2055                 for (i = 1; count < len && i < 5; i++) {
2056                         addr = buf;
2057                         qtd->hw_buf[i] = cpu_to_hc32(fusbh200, (u32)addr);
2058                         qtd->hw_buf_hi[i] = cpu_to_hc32(fusbh200,
2059                                         (u32)(addr >> 32));
2060                         buf += 0x1000;
2061                         if ((count + 0x1000) < len)
2062                                 count += 0x1000;
2063                         else
2064                                 count = len;
2065                 }
2066 
2067                 /* short packets may only terminate transfers */
2068                 if (count != len)
2069                         count -= (count % maxpacket);
2070         }
2071         qtd->hw_token = cpu_to_hc32(fusbh200, (count << 16) | token);
2072         qtd->length = count;
2073 
2074         return count;
2075 }
2076 
2077 /*-------------------------------------------------------------------------*/
2078 
2079 static inline void
2080 qh_update (struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh, struct fusbh200_qtd *qtd)
2081 {
2082         struct fusbh200_qh_hw *hw = qh->hw;
2083 
2084         /* writes to an active overlay are unsafe */
2085         BUG_ON(qh->qh_state != QH_STATE_IDLE);
2086 
2087         hw->hw_qtd_next = QTD_NEXT(fusbh200, qtd->qtd_dma);
2088         hw->hw_alt_next = FUSBH200_LIST_END(fusbh200);
2089 
2090         /* Except for control endpoints, we make hardware maintain data
2091          * toggle (like OHCI) ... here (re)initialize the toggle in the QH,
2092          * and set the pseudo-toggle in udev. Only usb_clear_halt() will
2093          * ever clear it.
2094          */
2095         if (!(hw->hw_info1 & cpu_to_hc32(fusbh200, QH_TOGGLE_CTL))) {
2096                 unsigned        is_out, epnum;
2097 
2098                 is_out = qh->is_out;
2099                 epnum = (hc32_to_cpup(fusbh200, &hw->hw_info1) >> 8) & 0x0f;
2100                 if (unlikely (!usb_gettoggle (qh->dev, epnum, is_out))) {
2101                         hw->hw_token &= ~cpu_to_hc32(fusbh200, QTD_TOGGLE);
2102                         usb_settoggle (qh->dev, epnum, is_out, 1);
2103                 }
2104         }
2105 
2106         hw->hw_token &= cpu_to_hc32(fusbh200, QTD_TOGGLE | QTD_STS_PING);
2107 }
2108 
2109 /* if it weren't for a common silicon quirk (writing the dummy into the qh
2110  * overlay, so qh->hw_token wrongly becomes inactive/halted), only fault
2111  * recovery (including urb dequeue) would need software changes to a QH...
2112  */
2113 static void
2114 qh_refresh (struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh)
2115 {
2116         struct fusbh200_qtd *qtd;
2117 
2118         if (list_empty (&qh->qtd_list))
2119                 qtd = qh->dummy;
2120         else {
2121                 qtd = list_entry (qh->qtd_list.next,
2122                                 struct fusbh200_qtd, qtd_list);
2123                 /*
2124                  * first qtd may already be partially processed.
2125                  * If we come here during unlink, the QH overlay region
2126                  * might have reference to the just unlinked qtd. The
2127                  * qtd is updated in qh_completions(). Update the QH
2128                  * overlay here.
2129                  */
2130                 if (cpu_to_hc32(fusbh200, qtd->qtd_dma) == qh->hw->hw_current) {
2131                         qh->hw->hw_qtd_next = qtd->hw_next;
2132                         qtd = NULL;
2133                 }
2134         }
2135 
2136         if (qtd)
2137                 qh_update (fusbh200, qh, qtd);
2138 }
2139 
2140 /*-------------------------------------------------------------------------*/
2141 
2142 static void qh_link_async(struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh);
2143 
2144 static void fusbh200_clear_tt_buffer_complete(struct usb_hcd *hcd,
2145                 struct usb_host_endpoint *ep)
2146 {
2147         struct fusbh200_hcd             *fusbh200 = hcd_to_fusbh200(hcd);
2148         struct fusbh200_qh              *qh = ep->hcpriv;
2149         unsigned long           flags;
2150 
2151         spin_lock_irqsave(&fusbh200->lock, flags);
2152         qh->clearing_tt = 0;
2153         if (qh->qh_state == QH_STATE_IDLE && !list_empty(&qh->qtd_list)
2154                         && fusbh200->rh_state == FUSBH200_RH_RUNNING)
2155                 qh_link_async(fusbh200, qh);
2156         spin_unlock_irqrestore(&fusbh200->lock, flags);
2157 }
2158 
2159 static void fusbh200_clear_tt_buffer(struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh,
2160                 struct urb *urb, u32 token)
2161 {
2162 
2163         /* If an async split transaction gets an error or is unlinked,
2164          * the TT buffer may be left in an indeterminate state.  We
2165          * have to clear the TT buffer.
2166          *
2167          * Note: this routine is never called for Isochronous transfers.
2168          */
2169         if (urb->dev->tt && !usb_pipeint(urb->pipe) && !qh->clearing_tt) {
2170                 struct usb_device *tt = urb->dev->tt->hub;
2171 
2172                 dev_dbg(&tt->dev,
2173                         "clear tt buffer port %d, a%d ep%d t%08x\n",
2174                         urb->dev->ttport, urb->dev->devnum,
2175                         usb_pipeendpoint(urb->pipe), token);
2176 
2177                 if (urb->dev->tt->hub !=
2178                     fusbh200_to_hcd(fusbh200)->self.root_hub) {
2179                         if (usb_hub_clear_tt_buffer(urb) == 0)
2180                                 qh->clearing_tt = 1;
2181                 }
2182         }
2183 }
2184 
2185 static int qtd_copy_status (
2186         struct fusbh200_hcd *fusbh200,
2187         struct urb *urb,
2188         size_t length,
2189         u32 token
2190 )
2191 {
2192         int     status = -EINPROGRESS;
2193 
2194         /* count IN/OUT bytes, not SETUP (even short packets) */
2195         if (likely (QTD_PID (token) != 2))
2196                 urb->actual_length += length - QTD_LENGTH (token);
2197 
2198         /* don't modify error codes */
2199         if (unlikely(urb->unlinked))
2200                 return status;
2201 
2202         /* force cleanup after short read; not always an error */
2203         if (unlikely (IS_SHORT_READ (token)))
2204                 status = -EREMOTEIO;
2205 
2206         /* serious "can't proceed" faults reported by the hardware */
2207         if (token & QTD_STS_HALT) {
2208                 if (token & QTD_STS_BABBLE) {
2209                         /* FIXME "must" disable babbling device's port too */
2210                         status = -EOVERFLOW;
2211                 /* CERR nonzero + halt --> stall */
2212                 } else if (QTD_CERR(token)) {
2213                         status = -EPIPE;
2214 
2215                 /* In theory, more than one of the following bits can be set
2216                  * since they are sticky and the transaction is retried.
2217                  * Which to test first is rather arbitrary.
2218                  */
2219                 } else if (token & QTD_STS_MMF) {
2220                         /* fs/ls interrupt xfer missed the complete-split */
2221                         status = -EPROTO;
2222                 } else if (token & QTD_STS_DBE) {
2223                         status = (QTD_PID (token) == 1) /* IN ? */
2224                                 ? -ENOSR  /* hc couldn't read data */
2225                                 : -ECOMM; /* hc couldn't write data */
2226                 } else if (token & QTD_STS_XACT) {
2227                         /* timeout, bad CRC, wrong PID, etc */
2228                         fusbh200_dbg(fusbh200, "devpath %s ep%d%s 3strikes\n",
2229                                 urb->dev->devpath,
2230                                 usb_pipeendpoint(urb->pipe),
2231                                 usb_pipein(urb->pipe) ? "in" : "out");
2232                         status = -EPROTO;
2233                 } else {        /* unknown */
2234                         status = -EPROTO;
2235                 }
2236 
2237                 fusbh200_dbg(fusbh200,
2238                         "dev%d ep%d%s qtd token %08x --> status %d\n",
2239                         usb_pipedevice (urb->pipe),
2240                         usb_pipeendpoint (urb->pipe),
2241                         usb_pipein (urb->pipe) ? "in" : "out",
2242                         token, status);
2243         }
2244 
2245         return status;
2246 }
2247 
2248 static void
2249 fusbh200_urb_done(struct fusbh200_hcd *fusbh200, struct urb *urb, int status)
2250 __releases(fusbh200->lock)
2251 __acquires(fusbh200->lock)
2252 {
2253         if (likely (urb->hcpriv != NULL)) {
2254                 struct fusbh200_qh      *qh = (struct fusbh200_qh *) urb->hcpriv;
2255 
2256                 /* S-mask in a QH means it's an interrupt urb */
2257                 if ((qh->hw->hw_info2 & cpu_to_hc32(fusbh200, QH_SMASK)) != 0) {
2258 
2259                         /* ... update hc-wide periodic stats (for usbfs) */
2260                         fusbh200_to_hcd(fusbh200)->self.bandwidth_int_reqs--;
2261                 }
2262         }
2263 
2264         if (unlikely(urb->unlinked)) {
2265                 COUNT(fusbh200->stats.unlink);
2266         } else {
2267                 /* report non-error and short read status as zero */
2268                 if (status == -EINPROGRESS || status == -EREMOTEIO)
2269                         status = 0;
2270                 COUNT(fusbh200->stats.complete);
2271         }
2272 
2273 #ifdef FUSBH200_URB_TRACE
2274         fusbh200_dbg (fusbh200,
2275                 "%s %s urb %p ep%d%s status %d len %d/%d\n",
2276                 __func__, urb->dev->devpath, urb,
2277                 usb_pipeendpoint (urb->pipe),
2278                 usb_pipein (urb->pipe) ? "in" : "out",
2279                 status,
2280                 urb->actual_length, urb->transfer_buffer_length);
2281 #endif
2282 
2283         /* complete() can reenter this HCD */
2284         usb_hcd_unlink_urb_from_ep(fusbh200_to_hcd(fusbh200), urb);
2285         spin_unlock (&fusbh200->lock);
2286         usb_hcd_giveback_urb(fusbh200_to_hcd(fusbh200), urb, status);
2287         spin_lock (&fusbh200->lock);
2288 }
2289 
2290 static int qh_schedule (struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh);
2291 
2292 /*
2293  * Process and free completed qtds for a qh, returning URBs to drivers.
2294  * Chases up to qh->hw_current.  Returns number of completions called,
2295  * indicating how much "real" work we did.
2296  */
2297 static unsigned
2298 qh_completions (struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh)
2299 {
2300         struct fusbh200_qtd             *last, *end = qh->dummy;
2301         struct list_head        *entry, *tmp;
2302         int                     last_status;
2303         int                     stopped;
2304         unsigned                count = 0;
2305         u8                      state;
2306         struct fusbh200_qh_hw   *hw = qh->hw;
2307 
2308         if (unlikely (list_empty (&qh->qtd_list)))
2309                 return count;
2310 
2311         /* completions (or tasks on other cpus) must never clobber HALT
2312          * till we've gone through and cleaned everything up, even when
2313          * they add urbs to this qh's queue or mark them for unlinking.
2314          *
2315          * NOTE:  unlinking expects to be done in queue order.
2316          *
2317          * It's a bug for qh->qh_state to be anything other than
2318          * QH_STATE_IDLE, unless our caller is scan_async() or
2319          * scan_intr().
2320          */
2321         state = qh->qh_state;
2322         qh->qh_state = QH_STATE_COMPLETING;
2323         stopped = (state == QH_STATE_IDLE);
2324 
2325  rescan:
2326         last = NULL;
2327         last_status = -EINPROGRESS;
2328         qh->needs_rescan = 0;
2329 
2330         /* remove de-activated QTDs from front of queue.
2331          * after faults (including short reads), cleanup this urb
2332          * then let the queue advance.
2333          * if queue is stopped, handles unlinks.
2334          */
2335         list_for_each_safe (entry, tmp, &qh->qtd_list) {
2336                 struct fusbh200_qtd     *qtd;
2337                 struct urb      *urb;
2338                 u32             token = 0;
2339 
2340                 qtd = list_entry (entry, struct fusbh200_qtd, qtd_list);
2341                 urb = qtd->urb;
2342 
2343                 /* clean up any state from previous QTD ...*/
2344                 if (last) {
2345                         if (likely (last->urb != urb)) {
2346                                 fusbh200_urb_done(fusbh200, last->urb, last_status);
2347                                 count++;
2348                                 last_status = -EINPROGRESS;
2349                         }
2350                         fusbh200_qtd_free (fusbh200, last);
2351                         last = NULL;
2352                 }
2353 
2354                 /* ignore urbs submitted during completions we reported */
2355                 if (qtd == end)
2356                         break;
2357 
2358                 /* hardware copies qtd out of qh overlay */
2359                 rmb ();
2360                 token = hc32_to_cpu(fusbh200, qtd->hw_token);
2361 
2362                 /* always clean up qtds the hc de-activated */
2363  retry_xacterr:
2364                 if ((token & QTD_STS_ACTIVE) == 0) {
2365 
2366                         /* Report Data Buffer Error: non-fatal but useful */
2367                         if (token & QTD_STS_DBE)
2368                                 fusbh200_dbg(fusbh200,
2369                                         "detected DataBufferErr for urb %p ep%d%s len %d, qtd %p [qh %p]\n",
2370                                         urb,
2371                                         usb_endpoint_num(&urb->ep->desc),
2372                                         usb_endpoint_dir_in(&urb->ep->desc) ? "in" : "out",
2373                                         urb->transfer_buffer_length,
2374                                         qtd,
2375                                         qh);
2376 
2377                         /* on STALL, error, and short reads this urb must
2378                          * complete and all its qtds must be recycled.
2379                          */
2380                         if ((token & QTD_STS_HALT) != 0) {
2381 
2382                                 /* retry transaction errors until we
2383                                  * reach the software xacterr limit
2384                                  */
2385                                 if ((token & QTD_STS_XACT) &&
2386                                                 QTD_CERR(token) == 0 &&
2387                                                 ++qh->xacterrs < QH_XACTERR_MAX &&
2388                                                 !urb->unlinked) {
2389                                         fusbh200_dbg(fusbh200,
2390         "detected XactErr len %zu/%zu retry %d\n",
2391         qtd->length - QTD_LENGTH(token), qtd->length, qh->xacterrs);
2392 
2393                                         /* reset the token in the qtd and the
2394                                          * qh overlay (which still contains
2395                                          * the qtd) so that we pick up from
2396                                          * where we left off
2397                                          */
2398                                         token &= ~QTD_STS_HALT;
2399                                         token |= QTD_STS_ACTIVE |
2400                                                         (FUSBH200_TUNE_CERR << 10);
2401                                         qtd->hw_token = cpu_to_hc32(fusbh200,
2402                                                         token);
2403                                         wmb();
2404                                         hw->hw_token = cpu_to_hc32(fusbh200,
2405                                                         token);
2406                                         goto retry_xacterr;
2407                                 }
2408                                 stopped = 1;
2409 
2410                         /* magic dummy for some short reads; qh won't advance.
2411                          * that silicon quirk can kick in with this dummy too.
2412                          *
2413                          * other short reads won't stop the queue, including
2414                          * control transfers (status stage handles that) or
2415                          * most other single-qtd reads ... the queue stops if
2416                          * URB_SHORT_NOT_OK was set so the driver submitting
2417                          * the urbs could clean it up.
2418                          */
2419                         } else if (IS_SHORT_READ (token)
2420                                         && !(qtd->hw_alt_next
2421                                                 & FUSBH200_LIST_END(fusbh200))) {
2422                                 stopped = 1;
2423                         }
2424 
2425                 /* stop scanning when we reach qtds the hc is using */
2426                 } else if (likely (!stopped
2427                                 && fusbh200->rh_state >= FUSBH200_RH_RUNNING)) {
2428                         break;
2429 
2430                 /* scan the whole queue for unlinks whenever it stops */
2431                 } else {
2432                         stopped = 1;
2433 
2434                         /* cancel everything if we halt, suspend, etc */
2435                         if (fusbh200->rh_state < FUSBH200_RH_RUNNING)
2436                                 last_status = -ESHUTDOWN;
2437 
2438                         /* this qtd is active; skip it unless a previous qtd
2439                          * for its urb faulted, or its urb was canceled.
2440                          */
2441                         else if (last_status == -EINPROGRESS && !urb->unlinked)
2442                                 continue;
2443 
2444                         /* qh unlinked; token in overlay may be most current */
2445                         if (state == QH_STATE_IDLE
2446                                         && cpu_to_hc32(fusbh200, qtd->qtd_dma)
2447                                                 == hw->hw_current) {
2448                                 token = hc32_to_cpu(fusbh200, hw->hw_token);
2449 
2450                                 /* An unlink may leave an incomplete
2451                                  * async transaction in the TT buffer.
2452                                  * We have to clear it.
2453                                  */
2454                                 fusbh200_clear_tt_buffer(fusbh200, qh, urb, token);
2455                         }
2456                 }
2457 
2458                 /* unless we already know the urb's status, collect qtd status
2459                  * and update count of bytes transferred.  in common short read
2460                  * cases with only one data qtd (including control transfers),
2461                  * queue processing won't halt.  but with two or more qtds (for
2462                  * example, with a 32 KB transfer), when the first qtd gets a
2463                  * short read the second must be removed by hand.
2464                  */
2465                 if (last_status == -EINPROGRESS) {
2466                         last_status = qtd_copy_status(fusbh200, urb,
2467                                         qtd->length, token);
2468                         if (last_status == -EREMOTEIO
2469                                         && (qtd->hw_alt_next
2470                                                 & FUSBH200_LIST_END(fusbh200)))
2471                                 last_status = -EINPROGRESS;
2472 
2473                         /* As part of low/full-speed endpoint-halt processing
2474                          * we must clear the TT buffer (11.17.5).
2475                          */
2476                         if (unlikely(last_status != -EINPROGRESS &&
2477                                         last_status != -EREMOTEIO)) {
2478                                 /* The TT's in some hubs malfunction when they
2479                                  * receive this request following a STALL (they
2480                                  * stop sending isochronous packets).  Since a
2481                                  * STALL can't leave the TT buffer in a busy
2482                                  * state (if you believe Figures 11-48 - 11-51
2483                                  * in the USB 2.0 spec), we won't clear the TT
2484                                  * buffer in this case.  Strictly speaking this
2485                                  * is a violation of the spec.
2486                                  */
2487                                 if (last_status != -EPIPE)
2488                                         fusbh200_clear_tt_buffer(fusbh200, qh, urb,
2489                                                         token);
2490                         }
2491                 }
2492 
2493                 /* if we're removing something not at the queue head,
2494                  * patch the hardware queue pointer.
2495                  */
2496                 if (stopped && qtd->qtd_list.prev != &qh->qtd_list) {
2497                         last = list_entry (qtd->qtd_list.prev,
2498                                         struct fusbh200_qtd, qtd_list);
2499                         last->hw_next = qtd->hw_next;
2500                 }
2501 
2502                 /* remove qtd; it's recycled after possible urb completion */
2503                 list_del (&qtd->qtd_list);
2504                 last = qtd;
2505 
2506                 /* reinit the xacterr counter for the next qtd */
2507                 qh->xacterrs = 0;
2508         }
2509 
2510         /* last urb's completion might still need calling */
2511         if (likely (last != NULL)) {
2512                 fusbh200_urb_done(fusbh200, last->urb, last_status);
2513                 count++;
2514                 fusbh200_qtd_free (fusbh200, last);
2515         }
2516 
2517         /* Do we need to rescan for URBs dequeued during a giveback? */
2518         if (unlikely(qh->needs_rescan)) {
2519                 /* If the QH is already unlinked, do the rescan now. */
2520                 if (state == QH_STATE_IDLE)
2521                         goto rescan;
2522 
2523                 /* Otherwise we have to wait until the QH is fully unlinked.
2524                  * Our caller will start an unlink if qh->needs_rescan is
2525                  * set.  But if an unlink has already started, nothing needs
2526                  * to be done.
2527                  */
2528                 if (state != QH_STATE_LINKED)
2529                         qh->needs_rescan = 0;
2530         }
2531 
2532         /* restore original state; caller must unlink or relink */
2533         qh->qh_state = state;
2534 
2535         /* be sure the hardware's done with the qh before refreshing
2536          * it after fault cleanup, or recovering from silicon wrongly
2537          * overlaying the dummy qtd (which reduces DMA chatter).
2538          */
2539         if (stopped != 0 || hw->hw_qtd_next == FUSBH200_LIST_END(fusbh200)) {
2540                 switch (state) {
2541                 case QH_STATE_IDLE:
2542                         qh_refresh(fusbh200, qh);
2543                         break;
2544                 case QH_STATE_LINKED:
2545                         /* We won't refresh a QH that's linked (after the HC
2546                          * stopped the queue).  That avoids a race:
2547                          *  - HC reads first part of QH;
2548                          *  - CPU updates that first part and the token;
2549                          *  - HC reads rest of that QH, including token
2550                          * Result:  HC gets an inconsistent image, and then
2551                          * DMAs to/from the wrong memory (corrupting it).
2552                          *
2553                          * That should be rare for interrupt transfers,
2554                          * except maybe high bandwidth ...
2555                          */
2556 
2557                         /* Tell the caller to start an unlink */
2558                         qh->needs_rescan = 1;
2559                         break;
2560                 /* otherwise, unlink already started */
2561                 }
2562         }
2563 
2564         return count;
2565 }
2566 
2567 /*-------------------------------------------------------------------------*/
2568 
2569 // high bandwidth multiplier, as encoded in highspeed endpoint descriptors
2570 #define hb_mult(wMaxPacketSize) (1 + (((wMaxPacketSize) >> 11) & 0x03))
2571 // ... and packet size, for any kind of endpoint descriptor
2572 #define max_packet(wMaxPacketSize) ((wMaxPacketSize) & 0x07ff)
2573 
2574 /*
2575  * reverse of qh_urb_transaction:  free a list of TDs.
2576  * used for cleanup after errors, before HC sees an URB's TDs.
2577  */
2578 static void qtd_list_free (
2579         struct fusbh200_hcd             *fusbh200,
2580         struct urb              *urb,
2581         struct list_head        *qtd_list
2582 ) {
2583         struct list_head        *entry, *temp;
2584 
2585         list_for_each_safe (entry, temp, qtd_list) {
2586                 struct fusbh200_qtd     *qtd;
2587 
2588                 qtd = list_entry (entry, struct fusbh200_qtd, qtd_list);
2589                 list_del (&qtd->qtd_list);
2590                 fusbh200_qtd_free (fusbh200, qtd);
2591         }
2592 }
2593 
2594 /*
2595  * create a list of filled qtds for this URB; won't link into qh.
2596  */
2597 static struct list_head *
2598 qh_urb_transaction (
2599         struct fusbh200_hcd             *fusbh200,
2600         struct urb              *urb,
2601         struct list_head        *head,
2602         gfp_t                   flags
2603 ) {
2604         struct fusbh200_qtd             *qtd, *qtd_prev;
2605         dma_addr_t              buf;
2606         int                     len, this_sg_len, maxpacket;
2607         int                     is_input;
2608         u32                     token;
2609         int                     i;
2610         struct scatterlist      *sg;
2611 
2612         /*
2613          * URBs map to sequences of QTDs:  one logical transaction
2614          */
2615         qtd = fusbh200_qtd_alloc (fusbh200, flags);
2616         if (unlikely (!qtd))
2617                 return NULL;
2618         list_add_tail (&qtd->qtd_list, head);
2619         qtd->urb = urb;
2620 
2621         token = QTD_STS_ACTIVE;
2622         token |= (FUSBH200_TUNE_CERR << 10);
2623         /* for split transactions, SplitXState initialized to zero */
2624 
2625         len = urb->transfer_buffer_length;
2626         is_input = usb_pipein (urb->pipe);
2627         if (usb_pipecontrol (urb->pipe)) {
2628                 /* SETUP pid */
2629                 qtd_fill(fusbh200, qtd, urb->setup_dma,
2630                                 sizeof (struct usb_ctrlrequest),
2631                                 token | (2 /* "setup" */ << 8), 8);
2632 
2633                 /* ... and always at least one more pid */
2634                 token ^= QTD_TOGGLE;
2635                 qtd_prev = qtd;
2636                 qtd = fusbh200_qtd_alloc (fusbh200, flags);
2637                 if (unlikely (!qtd))
2638                         goto cleanup;
2639                 qtd->urb = urb;
2640                 qtd_prev->hw_next = QTD_NEXT(fusbh200, qtd->qtd_dma);
2641                 list_add_tail (&qtd->qtd_list, head);
2642 
2643                 /* for zero length DATA stages, STATUS is always IN */
2644                 if (len == 0)
2645                         token |= (1 /* "in" */ << 8);
2646         }
2647 
2648         /*
2649          * data transfer stage:  buffer setup
2650          */
2651         i = urb->num_mapped_sgs;
2652         if (len > 0 && i > 0) {
2653                 sg = urb->sg;
2654                 buf = sg_dma_address(sg);
2655 
2656                 /* urb->transfer_buffer_length may be smaller than the
2657                  * size of the scatterlist (or vice versa)
2658                  */
2659                 this_sg_len = min_t(int, sg_dma_len(sg), len);
2660         } else {
2661                 sg = NULL;
2662                 buf = urb->transfer_dma;
2663                 this_sg_len = len;
2664         }
2665 
2666         if (is_input)
2667                 token |= (1 /* "in" */ << 8);
2668         /* else it's already initted to "out" pid (0 << 8) */
2669 
2670         maxpacket = max_packet(usb_maxpacket(urb->dev, urb->pipe, !is_input));
2671 
2672         /*
2673          * buffer gets wrapped in one or more qtds;
2674          * last one may be "short" (including zero len)
2675          * and may serve as a control status ack
2676          */
2677         for (;;) {
2678                 int this_qtd_len;
2679 
2680                 this_qtd_len = qtd_fill(fusbh200, qtd, buf, this_sg_len, token,
2681                                 maxpacket);
2682                 this_sg_len -= this_qtd_len;
2683                 len -= this_qtd_len;
2684                 buf += this_qtd_len;
2685 
2686                 /*
2687                  * short reads advance to a "magic" dummy instead of the next
2688                  * qtd ... that forces the queue to stop, for manual cleanup.
2689                  * (this will usually be overridden later.)
2690                  */
2691                 if (is_input)
2692                         qtd->hw_alt_next = fusbh200->async->hw->hw_alt_next;
2693 
2694                 /* qh makes control packets use qtd toggle; maybe switch it */
2695                 if ((maxpacket & (this_qtd_len + (maxpacket - 1))) == 0)
2696                         token ^= QTD_TOGGLE;
2697 
2698                 if (likely(this_sg_len <= 0)) {
2699                         if (--i <= 0 || len <= 0)
2700                                 break;
2701                         sg = sg_next(sg);
2702                         buf = sg_dma_address(sg);
2703                         this_sg_len = min_t(int, sg_dma_len(sg), len);
2704                 }
2705 
2706                 qtd_prev = qtd;
2707                 qtd = fusbh200_qtd_alloc (fusbh200, flags);
2708                 if (unlikely (!qtd))
2709                         goto cleanup;
2710                 qtd->urb = urb;
2711                 qtd_prev->hw_next = QTD_NEXT(fusbh200, qtd->qtd_dma);
2712                 list_add_tail (&qtd->qtd_list, head);
2713         }
2714 
2715         /*
2716          * unless the caller requires manual cleanup after short reads,
2717          * have the alt_next mechanism keep the queue running after the
2718          * last data qtd (the only one, for control and most other cases).
2719          */
2720         if (likely ((urb->transfer_flags & URB_SHORT_NOT_OK) == 0
2721                                 || usb_pipecontrol (urb->pipe)))
2722                 qtd->hw_alt_next = FUSBH200_LIST_END(fusbh200);
2723 
2724         /*
2725          * control requests may need a terminating data "status" ack;
2726          * other OUT ones may need a terminating short packet
2727          * (zero length).
2728          */
2729         if (likely (urb->transfer_buffer_length != 0)) {
2730                 int     one_more = 0;
2731 
2732                 if (usb_pipecontrol (urb->pipe)) {
2733                         one_more = 1;
2734                         token ^= 0x0100;        /* "in" <--> "out"  */
2735                         token |= QTD_TOGGLE;    /* force DATA1 */
2736                 } else if (usb_pipeout(urb->pipe)
2737                                 && (urb->transfer_flags & URB_ZERO_PACKET)
2738                                 && !(urb->transfer_buffer_length % maxpacket)) {
2739                         one_more = 1;
2740                 }
2741                 if (one_more) {
2742                         qtd_prev = qtd;
2743                         qtd = fusbh200_qtd_alloc (fusbh200, flags);
2744                         if (unlikely (!qtd))
2745                                 goto cleanup;
2746                         qtd->urb = urb;
2747                         qtd_prev->hw_next = QTD_NEXT(fusbh200, qtd->qtd_dma);
2748                         list_add_tail (&qtd->qtd_list, head);
2749 
2750                         /* never any data in such packets */
2751                         qtd_fill(fusbh200, qtd, 0, 0, token, 0);
2752                 }
2753         }
2754 
2755         /* by default, enable interrupt on urb completion */
2756         if (likely (!(urb->transfer_flags & URB_NO_INTERRUPT)))
2757                 qtd->hw_token |= cpu_to_hc32(fusbh200, QTD_IOC);
2758         return head;
2759 
2760 cleanup:
2761         qtd_list_free (fusbh200, urb, head);
2762         return NULL;
2763 }
2764 
2765 /*-------------------------------------------------------------------------*/
2766 
2767 // Would be best to create all qh's from config descriptors,
2768 // when each interface/altsetting is established.  Unlink
2769 // any previous qh and cancel its urbs first; endpoints are
2770 // implicitly reset then (data toggle too).
2771 // That'd mean updating how usbcore talks to HCDs. (2.7?)
2772 
2773 
2774 /*
2775  * Each QH holds a qtd list; a QH is used for everything except iso.
2776  *
2777  * For interrupt urbs, the scheduler must set the microframe scheduling
2778  * mask(s) each time the QH gets scheduled.  For highspeed, that's
2779  * just one microframe in the s-mask.  For split interrupt transactions
2780  * there are additional complications: c-mask, maybe FSTNs.
2781  */
2782 static struct fusbh200_qh *
2783 qh_make (
2784         struct fusbh200_hcd             *fusbh200,
2785         struct urb              *urb,
2786         gfp_t                   flags
2787 ) {
2788         struct fusbh200_qh              *qh = fusbh200_qh_alloc (fusbh200, flags);
2789         u32                     info1 = 0, info2 = 0;
2790         int                     is_input, type;
2791         int                     maxp = 0;
2792         struct usb_tt           *tt = urb->dev->tt;
2793         struct fusbh200_qh_hw   *hw;
2794 
2795         if (!qh)
2796                 return qh;
2797 
2798         /*
2799          * init endpoint/device data for this QH
2800          */
2801         info1 |= usb_pipeendpoint (urb->pipe) << 8;
2802         info1 |= usb_pipedevice (urb->pipe) << 0;
2803 
2804         is_input = usb_pipein (urb->pipe);
2805         type = usb_pipetype (urb->pipe);
2806         maxp = usb_maxpacket (urb->dev, urb->pipe, !is_input);
2807 
2808         /* 1024 byte maxpacket is a hardware ceiling.  High bandwidth
2809          * acts like up to 3KB, but is built from smaller packets.
2810          */
2811         if (max_packet(maxp) > 1024) {
2812                 fusbh200_dbg(fusbh200, "bogus qh maxpacket %d\n", max_packet(maxp));
2813                 goto done;
2814         }
2815 
2816         /* Compute interrupt scheduling parameters just once, and save.
2817          * - allowing for high bandwidth, how many nsec/uframe are used?
2818          * - split transactions need a second CSPLIT uframe; same question
2819          * - splits also need a schedule gap (for full/low speed I/O)
2820          * - qh has a polling interval
2821          *
2822          * For control/bulk requests, the HC or TT handles these.
2823          */
2824         if (type == PIPE_INTERRUPT) {
2825                 qh->usecs = NS_TO_US(usb_calc_bus_time(USB_SPEED_HIGH,
2826                                 is_input, 0,
2827                                 hb_mult(maxp) * max_packet(maxp)));
2828                 qh->start = NO_FRAME;
2829 
2830                 if (urb->dev->speed == USB_SPEED_HIGH) {
2831                         qh->c_usecs = 0;
2832                         qh->gap_uf = 0;
2833 
2834                         qh->period = urb->interval >> 3;
2835                         if (qh->period == 0 && urb->interval != 1) {
2836                                 /* NOTE interval 2 or 4 uframes could work.
2837                                  * But interval 1 scheduling is simpler, and
2838                                  * includes high bandwidth.
2839                                  */
2840                                 urb->interval = 1;
2841                         } else if (qh->period > fusbh200->periodic_size) {
2842                                 qh->period = fusbh200->periodic_size;
2843                                 urb->interval = qh->period << 3;
2844                         }
2845                 } else {
2846                         int             think_time;
2847 
2848                         /* gap is f(FS/LS transfer times) */
2849                         qh->gap_uf = 1 + usb_calc_bus_time (urb->dev->speed,
2850                                         is_input, 0, maxp) / (125 * 1000);
2851 
2852                         /* FIXME this just approximates SPLIT/CSPLIT times */
2853                         if (is_input) {         // SPLIT, gap, CSPLIT+DATA
2854                                 qh->c_usecs = qh->usecs + HS_USECS (0);
2855                                 qh->usecs = HS_USECS (1);
2856                         } else {                // SPLIT+DATA, gap, CSPLIT
2857                                 qh->usecs += HS_USECS (1);
2858                                 qh->c_usecs = HS_USECS (0);
2859                         }
2860 
2861                         think_time = tt ? tt->think_time : 0;
2862                         qh->tt_usecs = NS_TO_US (think_time +
2863                                         usb_calc_bus_time (urb->dev->speed,
2864                                         is_input, 0, max_packet (maxp)));
2865                         qh->period = urb->interval;
2866                         if (qh->period > fusbh200->periodic_size) {
2867                                 qh->period = fusbh200->periodic_size;
2868                                 urb->interval = qh->period;
2869                         }
2870                 }
2871         }
2872 
2873         /* support for tt scheduling, and access to toggles */
2874         qh->dev = urb->dev;
2875 
2876         /* using TT? */
2877         switch (urb->dev->speed) {
2878         case USB_SPEED_LOW:
2879                 info1 |= QH_LOW_SPEED;
2880                 /* FALL THROUGH */
2881 
2882         case USB_SPEED_FULL:
2883                 /* EPS 0 means "full" */
2884                 if (type != PIPE_INTERRUPT)
2885                         info1 |= (FUSBH200_TUNE_RL_TT << 28);
2886                 if (type == PIPE_CONTROL) {
2887                         info1 |= QH_CONTROL_EP;         /* for TT */
2888                         info1 |= QH_TOGGLE_CTL;         /* toggle from qtd */
2889                 }
2890                 info1 |= maxp << 16;
2891 
2892                 info2 |= (FUSBH200_TUNE_MULT_TT << 30);
2893 
2894                 /* Some Freescale processors have an erratum in which the
2895                  * port number in the queue head was 0..N-1 instead of 1..N.
2896                  */
2897                 if (fusbh200_has_fsl_portno_bug(fusbh200))
2898                         info2 |= (urb->dev->ttport-1) << 23;
2899                 else
2900                         info2 |= urb->dev->ttport << 23;
2901 
2902                 /* set the address of the TT; for TDI's integrated
2903                  * root hub tt, leave it zeroed.
2904                  */
2905                 if (tt && tt->hub != fusbh200_to_hcd(fusbh200)->self.root_hub)
2906                         info2 |= tt->hub->devnum << 16;
2907 
2908                 /* NOTE:  if (PIPE_INTERRUPT) { scheduler sets c-mask } */
2909 
2910                 break;
2911 
2912         case USB_SPEED_HIGH:            /* no TT involved */
2913                 info1 |= QH_HIGH_SPEED;
2914                 if (type == PIPE_CONTROL) {
2915                         info1 |= (FUSBH200_TUNE_RL_HS << 28);
2916                         info1 |= 64 << 16;      /* usb2 fixed maxpacket */
2917                         info1 |= QH_TOGGLE_CTL; /* toggle from qtd */
2918                         info2 |= (FUSBH200_TUNE_MULT_HS << 30);
2919                 } else if (type == PIPE_BULK) {
2920                         info1 |= (FUSBH200_TUNE_RL_HS << 28);
2921                         /* The USB spec says that high speed bulk endpoints
2922                          * always use 512 byte maxpacket.  But some device
2923                          * vendors decided to ignore that, and MSFT is happy
2924                          * to help them do so.  So now people expect to use
2925                          * such nonconformant devices with Linux too; sigh.
2926                          */
2927                         info1 |= max_packet(maxp) << 16;
2928                         info2 |= (FUSBH200_TUNE_MULT_HS << 30);
2929                 } else {                /* PIPE_INTERRUPT */
2930                         info1 |= max_packet (maxp) << 16;
2931                         info2 |= hb_mult (maxp) << 30;
2932                 }
2933                 break;
2934         default:
2935                 fusbh200_dbg(fusbh200, "bogus dev %p speed %d\n", urb->dev,
2936                         urb->dev->speed);
2937 done:
2938                 qh_destroy(fusbh200, qh);
2939                 return NULL;
2940         }
2941 
2942         /* NOTE:  if (PIPE_INTERRUPT) { scheduler sets s-mask } */
2943 
2944         /* init as live, toggle clear, advance to dummy */
2945         qh->qh_state = QH_STATE_IDLE;
2946         hw = qh->hw;
2947         hw->hw_info1 = cpu_to_hc32(fusbh200, info1);
2948         hw->hw_info2 = cpu_to_hc32(fusbh200, info2);
2949         qh->is_out = !is_input;
2950         usb_settoggle (urb->dev, usb_pipeendpoint (urb->pipe), !is_input, 1);
2951         qh_refresh (fusbh200, qh);
2952         return qh;
2953 }
2954 
2955 /*-------------------------------------------------------------------------*/
2956 
2957 static void enable_async(struct fusbh200_hcd *fusbh200)
2958 {
2959         if (fusbh200->async_count++)
2960                 return;
2961 
2962         /* Stop waiting to turn off the async schedule */
2963         fusbh200->enabled_hrtimer_events &= ~BIT(FUSBH200_HRTIMER_DISABLE_ASYNC);
2964 
2965         /* Don't start the schedule until ASS is 0 */
2966         fusbh200_poll_ASS(fusbh200);
2967         turn_on_io_watchdog(fusbh200);
2968 }
2969 
2970 static void disable_async(struct fusbh200_hcd *fusbh200)
2971 {
2972         if (--fusbh200->async_count)
2973                 return;
2974 
2975         /* The async schedule and async_unlink list are supposed to be empty */
2976         WARN_ON(fusbh200->async->qh_next.qh || fusbh200->async_unlink);
2977 
2978         /* Don't turn off the schedule until ASS is 1 */
2979         fusbh200_poll_ASS(fusbh200);
2980 }
2981 
2982 /* move qh (and its qtds) onto async queue; maybe enable queue.  */
2983 
2984 static void qh_link_async (struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh)
2985 {
2986         __hc32          dma = QH_NEXT(fusbh200, qh->qh_dma);
2987         struct fusbh200_qh      *head;
2988 
2989         /* Don't link a QH if there's a Clear-TT-Buffer pending */
2990         if (unlikely(qh->clearing_tt))
2991                 return;
2992 
2993         WARN_ON(qh->qh_state != QH_STATE_IDLE);
2994 
2995         /* clear halt and/or toggle; and maybe recover from silicon quirk */
2996         qh_refresh(fusbh200, qh);
2997 
2998         /* splice right after start */
2999         head = fusbh200->async;
3000         qh->qh_next = head->qh_next;
3001         qh->hw->hw_next = head->hw->hw_next;
3002         wmb ();
3003 
3004         head->qh_next.qh = qh;
3005         head->hw->hw_next = dma;
3006 
3007         qh->xacterrs = 0;
3008         qh->qh_state = QH_STATE_LINKED;
3009         /* qtd completions reported later by interrupt */
3010 
3011         enable_async(fusbh200);
3012 }
3013 
3014 /*-------------------------------------------------------------------------*/
3015 
3016 /*
3017  * For control/bulk/interrupt, return QH with these TDs appended.
3018  * Allocates and initializes the QH if necessary.
3019  * Returns null if it can't allocate a QH it needs to.
3020  * If the QH has TDs (urbs) already, that's great.
3021  */
3022 static struct fusbh200_qh *qh_append_tds (
3023         struct fusbh200_hcd             *fusbh200,
3024         struct urb              *urb,
3025         struct list_head        *qtd_list,
3026         int                     epnum,
3027         void                    **ptr
3028 )
3029 {
3030         struct fusbh200_qh              *qh = NULL;
3031         __hc32                  qh_addr_mask = cpu_to_hc32(fusbh200, 0x7f);
3032 
3033         qh = (struct fusbh200_qh *) *ptr;
3034         if (unlikely (qh == NULL)) {
3035                 /* can't sleep here, we have fusbh200->lock... */
3036                 qh = qh_make (fusbh200, urb, GFP_ATOMIC);
3037                 *ptr = qh;
3038         }
3039         if (likely (qh != NULL)) {
3040                 struct fusbh200_qtd     *qtd;
3041 
3042                 if (unlikely (list_empty (qtd_list)))
3043                         qtd = NULL;
3044                 else
3045                         qtd = list_entry (qtd_list->next, struct fusbh200_qtd,
3046                                         qtd_list);
3047 
3048                 /* control qh may need patching ... */
3049                 if (unlikely (epnum == 0)) {
3050 
3051                         /* usb_reset_device() briefly reverts to address 0 */
3052                         if (usb_pipedevice (urb->pipe) == 0)
3053                                 qh->hw->hw_info1 &= ~qh_addr_mask;
3054                 }
3055 
3056                 /* just one way to queue requests: swap with the dummy qtd.
3057                  * only hc or qh_refresh() ever modify the overlay.
3058                  */
3059                 if (likely (qtd != NULL)) {
3060                         struct fusbh200_qtd             *dummy;
3061                         dma_addr_t              dma;
3062                         __hc32                  token;
3063 
3064                         /* to avoid racing the HC, use the dummy td instead of
3065                          * the first td of our list (becomes new dummy).  both
3066                          * tds stay deactivated until we're done, when the
3067                          * HC is allowed to fetch the old dummy (4.10.2).
3068                          */
3069                         token = qtd->hw_token;
3070                         qtd->hw_token = HALT_BIT(fusbh200);
3071 
3072                         dummy = qh->dummy;
3073 
3074                         dma = dummy->qtd_dma;
3075                         *dummy = *qtd;
3076                         dummy->qtd_dma = dma;
3077 
3078                         list_del (&qtd->qtd_list);
3079                         list_add (&dummy->qtd_list, qtd_list);
3080                         list_splice_tail(qtd_list, &qh->qtd_list);
3081 
3082                         fusbh200_qtd_init(fusbh200, qtd, qtd->qtd_dma);
3083                         qh->dummy = qtd;
3084 
3085                         /* hc must see the new dummy at list end */
3086                         dma = qtd->qtd_dma;
3087                         qtd = list_entry (qh->qtd_list.prev,
3088                                         struct fusbh200_qtd, qtd_list);
3089                         qtd->hw_next = QTD_NEXT(fusbh200, dma);
3090 
3091                         /* let the hc process these next qtds */
3092                         wmb ();
3093                         dummy->hw_token = token;
3094 
3095                         urb->hcpriv = qh;
3096                 }
3097         }
3098         return qh;
3099 }
3100 
3101 /*-------------------------------------------------------------------------*/
3102 
3103 static int
3104 submit_async (
3105         struct fusbh200_hcd             *fusbh200,
3106         struct urb              *urb,
3107         struct list_head        *qtd_list,
3108         gfp_t                   mem_flags
3109 ) {
3110         int                     epnum;
3111         unsigned long           flags;
3112         struct fusbh200_qh              *qh = NULL;
3113         int                     rc;
3114 
3115         epnum = urb->ep->desc.bEndpointAddress;
3116 
3117 #ifdef FUSBH200_URB_TRACE
3118         {
3119                 struct fusbh200_qtd *qtd;
3120                 qtd = list_entry(qtd_list->next, struct fusbh200_qtd, qtd_list);
3121                 fusbh200_dbg(fusbh200,
3122                          "%s %s urb %p ep%d%s len %d, qtd %p [qh %p]\n",
3123                          __func__, urb->dev->devpath, urb,
3124                          epnum & 0x0f, (epnum & USB_DIR_IN) ? "in" : "out",
3125                          urb->transfer_buffer_length,
3126                          qtd, urb->ep->hcpriv);
3127         }
3128 #endif
3129 
3130         spin_lock_irqsave (&fusbh200->lock, flags);
3131         if (unlikely(!HCD_HW_ACCESSIBLE(fusbh200_to_hcd(fusbh200)))) {
3132                 rc = -ESHUTDOWN;
3133                 goto done;
3134         }
3135         rc = usb_hcd_link_urb_to_ep(fusbh200_to_hcd(fusbh200), urb);
3136         if (unlikely(rc))
3137                 goto done;
3138 
3139         qh = qh_append_tds(fusbh200, urb, qtd_list, epnum, &urb->ep->hcpriv);
3140         if (unlikely(qh == NULL)) {
3141                 usb_hcd_unlink_urb_from_ep(fusbh200_to_hcd(fusbh200), urb);
3142                 rc = -ENOMEM;
3143                 goto done;
3144         }
3145 
3146         /* Control/bulk operations through TTs don't need scheduling,
3147          * the HC and TT handle it when the TT has a buffer ready.
3148          */
3149         if (likely (qh->qh_state == QH_STATE_IDLE))
3150                 qh_link_async(fusbh200, qh);
3151  done:
3152         spin_unlock_irqrestore (&fusbh200->lock, flags);
3153         if (unlikely (qh == NULL))
3154                 qtd_list_free (fusbh200, urb, qtd_list);
3155         return rc;
3156 }
3157 
3158 /*-------------------------------------------------------------------------*/
3159 
3160 static void single_unlink_async(struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh)
3161 {
3162         struct fusbh200_qh              *prev;
3163 
3164         /* Add to the end of the list of QHs waiting for the next IAAD */
3165         qh->qh_state = QH_STATE_UNLINK;
3166         if (fusbh200->async_unlink)
3167                 fusbh200->async_unlink_last->unlink_next = qh;
3168         else
3169                 fusbh200->async_unlink = qh;
3170         fusbh200->async_unlink_last = qh;
3171 
3172         /* Unlink it from the schedule */
3173         prev = fusbh200->async;
3174         while (prev->qh_next.qh != qh)
3175                 prev = prev->qh_next.qh;
3176 
3177         prev->hw->hw_next = qh->hw->hw_next;
3178         prev->qh_next = qh->qh_next;
3179         if (fusbh200->qh_scan_next == qh)
3180                 fusbh200->qh_scan_next = qh->qh_next.qh;
3181 }
3182 
3183 static void start_iaa_cycle(struct fusbh200_hcd *fusbh200, bool nested)
3184 {
3185         /*
3186          * Do nothing if an IAA cycle is already running or
3187          * if one will be started shortly.
3188          */
3189         if (fusbh200->async_iaa || fusbh200->async_unlinking)
3190                 return;
3191 
3192         /* Do all the waiting QHs at once */
3193         fusbh200->async_iaa = fusbh200->async_unlink;
3194         fusbh200->async_unlink = NULL;
3195 
3196         /* If the controller isn't running, we don't have to wait for it */
3197         if (unlikely(fusbh200->rh_state < FUSBH200_RH_RUNNING)) {
3198                 if (!nested)            /* Avoid recursion */
3199                         end_unlink_async(fusbh200);
3200 
3201         /* Otherwise start a new IAA cycle */
3202         } else if (likely(fusbh200->rh_state == FUSBH200_RH_RUNNING)) {
3203                 /* Make sure the unlinks are all visible to the hardware */
3204                 wmb();
3205 
3206                 fusbh200_writel(fusbh200, fusbh200->command | CMD_IAAD,
3207                                 &fusbh200->regs->command);
3208                 fusbh200_readl(fusbh200, &fusbh200->regs->command);
3209                 fusbh200_enable_event(fusbh200, FUSBH200_HRTIMER_IAA_WATCHDOG, true);
3210         }
3211 }
3212 
3213 /* the async qh for the qtds being unlinked are now gone from the HC */
3214 
3215 static void end_unlink_async(struct fusbh200_hcd *fusbh200)
3216 {
3217         struct fusbh200_qh              *qh;
3218 
3219         /* Process the idle QHs */
3220  restart:
3221         fusbh200->async_unlinking = true;
3222         while (fusbh200->async_iaa) {
3223                 qh = fusbh200->async_iaa;
3224                 fusbh200->async_iaa = qh->unlink_next;
3225                 qh->unlink_next = NULL;
3226 
3227                 qh->qh_state = QH_STATE_IDLE;
3228                 qh->qh_next.qh = NULL;
3229 
3230                 qh_completions(fusbh200, qh);
3231                 if (!list_empty(&qh->qtd_list) &&
3232                                 fusbh200->rh_state == FUSBH200_RH_RUNNING)
3233                         qh_link_async(fusbh200, qh);
3234                 disable_async(fusbh200);
3235         }
3236         fusbh200->async_unlinking = false;
3237 
3238         /* Start a new IAA cycle if any QHs are waiting for it */
3239         if (fusbh200->async_unlink) {
3240                 start_iaa_cycle(fusbh200, true);
3241                 if (unlikely(fusbh200->rh_state < FUSBH200_RH_RUNNING))
3242                         goto restart;
3243         }
3244 }
3245 
3246 static void unlink_empty_async(struct fusbh200_hcd *fusbh200)
3247 {
3248         struct fusbh200_qh              *qh, *next;
3249         bool                    stopped = (fusbh200->rh_state < FUSBH200_RH_RUNNING);
3250         bool                    check_unlinks_later = false;
3251 
3252         /* Unlink all the async QHs that have been empty for a timer cycle */
3253         next = fusbh200->async->qh_next.qh;
3254         while (next) {
3255                 qh = next;
3256                 next = qh->qh_next.qh;
3257 
3258                 if (list_empty(&qh->qtd_list) &&
3259                                 qh->qh_state == QH_STATE_LINKED) {
3260                         if (!stopped && qh->unlink_cycle ==
3261                                         fusbh200->async_unlink_cycle)
3262                                 check_unlinks_later = true;
3263                         else
3264                                 single_unlink_async(fusbh200, qh);
3265                 }
3266         }
3267 
3268         /* Start a new IAA cycle if any QHs are waiting for it */
3269         if (fusbh200->async_unlink)
3270                 start_iaa_cycle(fusbh200, false);
3271 
3272         /* QHs that haven't been empty for long enough will be handled later */
3273         if (check_unlinks_later) {
3274                 fusbh200_enable_event(fusbh200, FUSBH200_HRTIMER_ASYNC_UNLINKS, true);
3275                 ++fusbh200->async_unlink_cycle;
3276         }
3277 }
3278 
3279 /* makes sure the async qh will become idle */
3280 /* caller must own fusbh200->lock */
3281 
3282 static void start_unlink_async(struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh)
3283 {
3284         /*
3285          * If the QH isn't linked then there's nothing we can do
3286          * unless we were called during a giveback, in which case
3287          * qh_completions() has to deal with it.
3288          */
3289         if (qh->qh_state != QH_STATE_LINKED) {
3290                 if (qh->qh_state == QH_STATE_COMPLETING)
3291                         qh->needs_rescan = 1;
3292                 return;
3293         }
3294 
3295         single_unlink_async(fusbh200, qh);
3296         start_iaa_cycle(fusbh200, false);
3297 }
3298 
3299 /*-------------------------------------------------------------------------*/
3300 
3301 static void scan_async (struct fusbh200_hcd *fusbh200)
3302 {
3303         struct fusbh200_qh              *qh;
3304         bool                    check_unlinks_later = false;
3305 
3306         fusbh200->qh_scan_next = fusbh200->async->qh_next.qh;
3307         while (fusbh200->qh_scan_next) {
3308                 qh = fusbh200->qh_scan_next;
3309                 fusbh200->qh_scan_next = qh->qh_next.qh;
3310  rescan:
3311                 /* clean any finished work for this qh */
3312                 if (!list_empty(&qh->qtd_list)) {
3313                         int temp;
3314 
3315                         /*
3316                          * Unlinks could happen here; completion reporting
3317                          * drops the lock.  That's why fusbh200->qh_scan_next
3318                          * always holds the next qh to scan; if the next qh
3319                          * gets unlinked then fusbh200->qh_scan_next is adjusted
3320                          * in single_unlink_async().
3321                          */
3322                         temp = qh_completions(fusbh200, qh);
3323                         if (qh->needs_rescan) {
3324                                 start_unlink_async(fusbh200, qh);
3325                         } else if (list_empty(&qh->qtd_list)
3326                                         && qh->qh_state == QH_STATE_LINKED) {
3327                                 qh->unlink_cycle = fusbh200->async_unlink_cycle;
3328                                 check_unlinks_later = true;
3329                         } else if (temp != 0)
3330                                 goto rescan;
3331                 }
3332         }
3333 
3334         /*
3335          * Unlink empty entries, reducing DMA usage as well
3336          * as HCD schedule-scanning costs.  Delay for any qh
3337          * we just scanned, there's a not-unusual case that it
3338          * doesn't stay idle for long.
3339          */
3340         if (check_unlinks_later && fusbh200->rh_state == FUSBH200_RH_RUNNING &&
3341                         !(fusbh200->enabled_hrtimer_events &
3342                                 BIT(FUSBH200_HRTIMER_ASYNC_UNLINKS))) {
3343                 fusbh200_enable_event(fusbh200, FUSBH200_HRTIMER_ASYNC_UNLINKS, true);
3344                 ++fusbh200->async_unlink_cycle;
3345         }
3346 }
3347 /*-------------------------------------------------------------------------*/
3348 /*
3349  * EHCI scheduled transaction support:  interrupt, iso, split iso
3350  * These are called "periodic" transactions in the EHCI spec.
3351  *
3352  * Note that for interrupt transfers, the QH/QTD manipulation is shared
3353  * with the "asynchronous" transaction support (control/bulk transfers).
3354  * The only real difference is in how interrupt transfers are scheduled.
3355  *
3356  * For ISO, we make an "iso_stream" head to serve the same role as a QH.
3357  * It keeps track of every ITD (or SITD) that's linked, and holds enough
3358  * pre-calculated schedule data to make appending to the queue be quick.
3359  */
3360 
3361 static int fusbh200_get_frame (struct usb_hcd *hcd);
3362 
3363 /*-------------------------------------------------------------------------*/
3364 
3365 /*
3366  * periodic_next_shadow - return "next" pointer on shadow list
3367  * @periodic: host pointer to qh/itd
3368  * @tag: hardware tag for type of this record
3369  */
3370 static union fusbh200_shadow *
3371 periodic_next_shadow(struct fusbh200_hcd *fusbh200, union fusbh200_shadow *periodic,
3372                 __hc32 tag)
3373 {
3374         switch (hc32_to_cpu(fusbh200, tag)) {
3375         case Q_TYPE_QH:
3376                 return &periodic->qh->qh_next;
3377         case Q_TYPE_FSTN:
3378                 return &periodic->fstn->fstn_next;
3379         default:
3380                 return &periodic->itd->itd_next;
3381         }
3382 }
3383 
3384 static __hc32 *
3385 shadow_next_periodic(struct fusbh200_hcd *fusbh200, union fusbh200_shadow *periodic,
3386                 __hc32 tag)
3387 {
3388         switch (hc32_to_cpu(fusbh200, tag)) {
3389         /* our fusbh200_shadow.qh is actually software part */
3390         case Q_TYPE_QH:
3391                 return &periodic->qh->hw->hw_next;
3392         /* others are hw parts */
3393         default:
3394                 return periodic->hw_next;
3395         }
3396 }
3397 
3398 /* caller must hold fusbh200->lock */
3399 static void periodic_unlink (struct fusbh200_hcd *fusbh200, unsigned frame, void *ptr)
3400 {
3401         union fusbh200_shadow   *prev_p = &fusbh200->pshadow[frame];
3402         __hc32                  *hw_p = &fusbh200->periodic[frame];
3403         union fusbh200_shadow   here = *prev_p;
3404 
3405         /* find predecessor of "ptr"; hw and shadow lists are in sync */
3406         while (here.ptr && here.ptr != ptr) {
3407                 prev_p = periodic_next_shadow(fusbh200, prev_p,
3408                                 Q_NEXT_TYPE(fusbh200, *hw_p));
3409                 hw_p = shadow_next_periodic(fusbh200, &here,
3410                                 Q_NEXT_TYPE(fusbh200, *hw_p));
3411                 here = *prev_p;
3412         }
3413         /* an interrupt entry (at list end) could have been shared */
3414         if (!here.ptr)
3415                 return;
3416 
3417         /* update shadow and hardware lists ... the old "next" pointers
3418          * from ptr may still be in use, the caller updates them.
3419          */
3420         *prev_p = *periodic_next_shadow(fusbh200, &here,
3421                         Q_NEXT_TYPE(fusbh200, *hw_p));
3422 
3423         *hw_p = *shadow_next_periodic(fusbh200, &here,
3424                                 Q_NEXT_TYPE(fusbh200, *hw_p));
3425 }
3426 
3427 /* how many of the uframe's 125 usecs are allocated? */
3428 static unsigned short
3429 periodic_usecs (struct fusbh200_hcd *fusbh200, unsigned frame, unsigned uframe)
3430 {
3431         __hc32                  *hw_p = &fusbh200->periodic [frame];
3432         union fusbh200_shadow   *q = &fusbh200->pshadow [frame];
3433         unsigned                usecs = 0;
3434         struct fusbh200_qh_hw   *hw;
3435 
3436         while (q->ptr) {
3437                 switch (hc32_to_cpu(fusbh200, Q_NEXT_TYPE(fusbh200, *hw_p))) {
3438                 case Q_TYPE_QH:
3439                         hw = q->qh->hw;
3440                         /* is it in the S-mask? */
3441                         if (hw->hw_info2 & cpu_to_hc32(fusbh200, 1 << uframe))
3442                                 usecs += q->qh->usecs;
3443                         /* ... or C-mask? */
3444                         if (hw->hw_info2 & cpu_to_hc32(fusbh200,
3445                                         1 << (8 + uframe)))
3446                                 usecs += q->qh->c_usecs;
3447                         hw_p = &hw->hw_next;
3448                         q = &q->qh->qh_next;
3449                         break;
3450                 // case Q_TYPE_FSTN:
3451                 default:
3452                         /* for "save place" FSTNs, count the relevant INTR
3453                          * bandwidth from the previous frame
3454                          */
3455                         if (q->fstn->hw_prev != FUSBH200_LIST_END(fusbh200)) {
3456                                 fusbh200_dbg (fusbh200, "ignoring FSTN cost ...\n");
3457                         }
3458                         hw_p = &q->fstn->hw_next;
3459                         q = &q->fstn->fstn_next;
3460                         break;
3461                 case Q_TYPE_ITD:
3462                         if (q->itd->hw_transaction[uframe])
3463                                 usecs += q->itd->stream->usecs;
3464                         hw_p = &q->itd->hw_next;
3465                         q = &q->itd->itd_next;
3466                         break;
3467                 }
3468         }
3469         if (usecs > fusbh200->uframe_periodic_max)
3470                 fusbh200_err (fusbh200, "uframe %d sched overrun: %d usecs\n",
3471                         frame * 8 + uframe, usecs);
3472         return usecs;
3473 }
3474 
3475 /*-------------------------------------------------------------------------*/
3476 
3477 static int same_tt (struct usb_device *dev1, struct usb_device *dev2)
3478 {
3479         if (!dev1->tt || !dev2->tt)
3480                 return 0;
3481         if (dev1->tt != dev2->tt)
3482                 return 0;
3483         if (dev1->tt->multi)
3484                 return dev1->ttport == dev2->ttport;
3485         else
3486                 return 1;
3487 }
3488 
3489 /* return true iff the device's transaction translator is available
3490  * for a periodic transfer starting at the specified frame, using
3491  * all the uframes in the mask.
3492  */
3493 static int tt_no_collision (
3494         struct fusbh200_hcd             *fusbh200,
3495         unsigned                period,
3496         struct usb_device       *dev,
3497         unsigned                frame,
3498         u32                     uf_mask
3499 )
3500 {
3501         if (period == 0)        /* error */
3502                 return 0;
3503 
3504         /* note bandwidth wastage:  split never follows csplit
3505          * (different dev or endpoint) until the next uframe.
3506          * calling convention doesn't make that distinction.
3507          */
3508         for (; frame < fusbh200->periodic_size; frame += period) {
3509                 union fusbh200_shadow   here;
3510                 __hc32                  type;
3511                 struct fusbh200_qh_hw   *hw;
3512 
3513                 here = fusbh200->pshadow [frame];
3514                 type = Q_NEXT_TYPE(fusbh200, fusbh200->periodic [frame]);
3515                 while (here.ptr) {
3516                         switch (hc32_to_cpu(fusbh200, type)) {
3517                         case Q_TYPE_ITD:
3518                                 type = Q_NEXT_TYPE(fusbh200, here.itd->hw_next);
3519                                 here = here.itd->itd_next;
3520                                 continue;
3521                         case Q_TYPE_QH:
3522                                 hw = here.qh->hw;
3523                                 if (same_tt (dev, here.qh->dev)) {
3524                                         u32             mask;
3525 
3526                                         mask = hc32_to_cpu(fusbh200,
3527                                                         hw->hw_info2);
3528                                         /* "knows" no gap is needed */
3529                                         mask |= mask >> 8;
3530                                         if (mask & uf_mask)
3531                                                 break;
3532                                 }
3533                                 type = Q_NEXT_TYPE(fusbh200, hw->hw_next);
3534                                 here = here.qh->qh_next;
3535                                 continue;
3536                         // case Q_TYPE_FSTN:
3537                         default:
3538                                 fusbh200_dbg (fusbh200,
3539                                         "periodic frame %d bogus type %d\n",
3540                                         frame, type);
3541                         }
3542 
3543                         /* collision or error */
3544                         return 0;
3545                 }
3546         }
3547 
3548         /* no collision */
3549         return 1;
3550 }
3551 
3552 /*-------------------------------------------------------------------------*/
3553 
3554 static void enable_periodic(struct fusbh200_hcd *fusbh200)
3555 {
3556         if (fusbh200->periodic_count++)
3557                 return;
3558 
3559         /* Stop waiting to turn off the periodic schedule */
3560         fusbh200->enabled_hrtimer_events &= ~BIT(FUSBH200_HRTIMER_DISABLE_PERIODIC);
3561 
3562         /* Don't start the schedule until PSS is 0 */
3563         fusbh200_poll_PSS(fusbh200);
3564         turn_on_io_watchdog(fusbh200);
3565 }
3566 
3567 static void disable_periodic(struct fusbh200_hcd *fusbh200)
3568 {
3569         if (--fusbh200->periodic_count)
3570                 return;
3571 
3572         /* Don't turn off the schedule until PSS is 1 */
3573         fusbh200_poll_PSS(fusbh200);
3574 }
3575 
3576 /*-------------------------------------------------------------------------*/
3577 
3578 /* periodic schedule slots have iso tds (normal or split) first, then a
3579  * sparse tree for active interrupt transfers.
3580  *
3581  * this just links in a qh; caller guarantees uframe masks are set right.
3582  * no FSTN support (yet; fusbh200 0.96+)
3583  */
3584 static void qh_link_periodic(struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh)
3585 {
3586         unsigned        i;
3587         unsigned        period = qh->period;
3588 
3589         dev_dbg (&qh->dev->dev,
3590                 "link qh%d-%04x/%p start %d [%d/%d us]\n",
3591                 period, hc32_to_cpup(fusbh200, &qh->hw->hw_info2)
3592                         & (QH_CMASK | QH_SMASK),
3593                 qh, qh->start, qh->usecs, qh->c_usecs);
3594 
3595         /* high bandwidth, or otherwise every microframe */
3596         if (period == 0)
3597                 period = 1;
3598 
3599         for (i = qh->start; i < fusbh200->periodic_size; i += period) {
3600                 union fusbh200_shadow   *prev = &fusbh200->pshadow[i];
3601                 __hc32                  *hw_p = &fusbh200->periodic[i];
3602                 union fusbh200_shadow   here = *prev;
3603                 __hc32                  type = 0;
3604 
3605                 /* skip the iso nodes at list head */
3606                 while (here.ptr) {
3607                         type = Q_NEXT_TYPE(fusbh200, *hw_p);
3608                         if (type == cpu_to_hc32(fusbh200, Q_TYPE_QH))
3609                                 break;
3610                         prev = periodic_next_shadow(fusbh200, prev, type);
3611                         hw_p = shadow_next_periodic(fusbh200, &here, type);
3612                         here = *prev;
3613                 }
3614 
3615                 /* sorting each branch by period (slow-->fast)
3616                  * enables sharing interior tree nodes
3617                  */
3618                 while (here.ptr && qh != here.qh) {
3619                         if (qh->period > here.qh->period)
3620                                 break;
3621                         prev = &here.qh->qh_next;
3622                         hw_p = &here.qh->hw->hw_next;
3623                         here = *prev;
3624                 }
3625                 /* link in this qh, unless some earlier pass did that */
3626                 if (qh != here.qh) {
3627                         qh->qh_next = here;
3628                         if (here.qh)
3629                                 qh->hw->hw_next = *hw_p;
3630                         wmb ();
3631                         prev->qh = qh;
3632                         *hw_p = QH_NEXT (fusbh200, qh->qh_dma);
3633                 }
3634         }
3635         qh->qh_state = QH_STATE_LINKED;
3636         qh->xacterrs = 0;
3637 
3638         /* update per-qh bandwidth for usbfs */
3639         fusbh200_to_hcd(fusbh200)->self.bandwidth_allocated += qh->period
3640                 ? ((qh->usecs + qh->c_usecs) / qh->period)
3641                 : (qh->usecs * 8);
3642 
3643         list_add(&qh->intr_node, &fusbh200->intr_qh_list);
3644 
3645         /* maybe enable periodic schedule processing */
3646         ++fusbh200->intr_count;
3647         enable_periodic(fusbh200);
3648 }
3649 
3650 static void qh_unlink_periodic(struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh)
3651 {
3652         unsigned        i;
3653         unsigned        period;
3654 
3655         /*
3656          * If qh is for a low/full-speed device, simply unlinking it
3657          * could interfere with an ongoing split transaction.  To unlink
3658          * it safely would require setting the QH_INACTIVATE bit and
3659          * waiting at least one frame, as described in EHCI 4.12.2.5.
3660          *
3661          * We won't bother with any of this.  Instead, we assume that the
3662          * only reason for unlinking an interrupt QH while the current URB
3663          * is still active is to dequeue all the URBs (flush the whole
3664          * endpoint queue).
3665          *
3666          * If rebalancing the periodic schedule is ever implemented, this
3667          * approach will no longer be valid.
3668          */
3669 
3670         /* high bandwidth, or otherwise part of every microframe */
3671         if ((period = qh->period) == 0)
3672                 period = 1;
3673 
3674         for (i = qh->start; i < fusbh200->periodic_size; i += period)
3675                 periodic_unlink (fusbh200, i, qh);
3676 
3677         /* update per-qh bandwidth for usbfs */
3678         fusbh200_to_hcd(fusbh200)->self.bandwidth_allocated -= qh->period
3679                 ? ((qh->usecs + qh->c_usecs) / qh->period)
3680                 : (qh->usecs * 8);
3681 
3682         dev_dbg (&qh->dev->dev,
3683                 "unlink qh%d-%04x/%p start %d [%d/%d us]\n",
3684                 qh->period,
3685                 hc32_to_cpup(fusbh200, &qh->hw->hw_info2) & (QH_CMASK | QH_SMASK),
3686                 qh, qh->start, qh->usecs, qh->c_usecs);
3687 
3688         /* qh->qh_next still "live" to HC */
3689         qh->qh_state = QH_STATE_UNLINK;
3690         qh->qh_next.ptr = NULL;
3691 
3692         if (fusbh200->qh_scan_next == qh)
3693                 fusbh200->qh_scan_next = list_entry(qh->intr_node.next,
3694                                 struct fusbh200_qh, intr_node);
3695         list_del(&qh->intr_node);
3696 }
3697 
3698 static void start_unlink_intr(struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh)
3699 {
3700         /* If the QH isn't linked then there's nothing we can do
3701          * unless we were called during a giveback, in which case
3702          * qh_completions() has to deal with it.
3703          */
3704         if (qh->qh_state != QH_STATE_LINKED) {
3705                 if (qh->qh_state == QH_STATE_COMPLETING)
3706                         qh->needs_rescan = 1;
3707                 return;
3708         }
3709 
3710         qh_unlink_periodic (fusbh200, qh);
3711 
3712         /* Make sure the unlinks are visible before starting the timer */
3713         wmb();
3714 
3715         /*
3716          * The EHCI spec doesn't say how long it takes the controller to
3717          * stop accessing an unlinked interrupt QH.  The timer delay is
3718          * 9 uframes; presumably that will be long enough.
3719          */
3720         qh->unlink_cycle = fusbh200->intr_unlink_cycle;
3721 
3722         /* New entries go at the end of the intr_unlink list */
3723         if (fusbh200->intr_unlink)
3724                 fusbh200->intr_unlink_last->unlink_next = qh;
3725         else
3726                 fusbh200->intr_unlink = qh;
3727         fusbh200->intr_unlink_last = qh;
3728 
3729         if (fusbh200->intr_unlinking)
3730                 ;       /* Avoid recursive calls */
3731         else if (fusbh200->rh_state < FUSBH200_RH_RUNNING)
3732                 fusbh200_handle_intr_unlinks(fusbh200);
3733         else if (fusbh200->intr_unlink == qh) {
3734                 fusbh200_enable_event(fusbh200, FUSBH200_HRTIMER_UNLINK_INTR, true);
3735                 ++fusbh200->intr_unlink_cycle;
3736         }
3737 }
3738 
3739 static void end_unlink_intr(struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh)
3740 {
3741         struct fusbh200_qh_hw   *hw = qh->hw;
3742         int                     rc;
3743 
3744         qh->qh_state = QH_STATE_IDLE;
3745         hw->hw_next = FUSBH200_LIST_END(fusbh200);
3746 
3747         qh_completions(fusbh200, qh);
3748 
3749         /* reschedule QH iff another request is queued */
3750         if (!list_empty(&qh->qtd_list) && fusbh200->rh_state == FUSBH200_RH_RUNNING) {
3751                 rc = qh_schedule(fusbh200, qh);
3752 
3753                 /* An error here likely indicates handshake failure
3754                  * or no space left in the schedule.  Neither fault
3755                  * should happen often ...
3756                  *
3757                  * FIXME kill the now-dysfunctional queued urbs
3758                  */
3759                 if (rc != 0)
3760                         fusbh200_err(fusbh200, "can't reschedule qh %p, err %d\n",
3761                                         qh, rc);
3762         }
3763 
3764         /* maybe turn off periodic schedule */
3765         --fusbh200->intr_count;
3766         disable_periodic(fusbh200);
3767 }
3768 
3769 /*-------------------------------------------------------------------------*/
3770 
3771 static int check_period (
3772         struct fusbh200_hcd *fusbh200,
3773         unsigned        frame,
3774         unsigned        uframe,
3775         unsigned        period,
3776         unsigned        usecs
3777 ) {
3778         int             claimed;
3779 
3780         /* complete split running into next frame?
3781          * given FSTN support, we could sometimes check...
3782          */
3783         if (uframe >= 8)
3784                 return 0;
3785 
3786         /* convert "usecs we need" to "max already claimed" */
3787         usecs = fusbh200->uframe_periodic_max - usecs;
3788 
3789         /* we "know" 2 and 4 uframe intervals were rejected; so
3790          * for period 0, check _every_ microframe in the schedule.
3791          */
3792         if (unlikely (period == 0)) {
3793                 do {
3794                         for (uframe = 0; uframe < 7; uframe++) {
3795                                 claimed = periodic_usecs (fusbh200, frame, uframe);
3796                                 if (claimed > usecs)
3797                                         return 0;
3798                         }
3799                 } while ((frame += 1) < fusbh200->periodic_size);
3800 
3801         /* just check the specified uframe, at that period */
3802         } else {
3803                 do {
3804                         claimed = periodic_usecs (fusbh200, frame, uframe);
3805                         if (claimed > usecs)
3806                                 return 0;
3807                 } while ((frame += period) < fusbh200->periodic_size);
3808         }
3809 
3810         // success!
3811         return 1;
3812 }
3813 
3814 static int check_intr_schedule (
3815         struct fusbh200_hcd             *fusbh200,
3816         unsigned                frame,
3817         unsigned                uframe,
3818         const struct fusbh200_qh        *qh,
3819         __hc32                  *c_maskp
3820 )
3821 {
3822         int             retval = -ENOSPC;
3823         u8              mask = 0;
3824 
3825         if (qh->c_usecs && uframe >= 6)         /* FSTN territory? */
3826                 goto done;
3827 
3828         if (!check_period (fusbh200, frame, uframe, qh->period, qh->usecs))
3829                 goto done;
3830         if (!qh->c_usecs) {
3831                 retval = 0;
3832                 *c_maskp = 0;
3833                 goto done;
3834         }
3835 
3836         /* Make sure this tt's buffer is also available for CSPLITs.
3837          * We pessimize a bit; probably the typical full speed case
3838          * doesn't need the second CSPLIT.
3839          *
3840          * NOTE:  both SPLIT and CSPLIT could be checked in just
3841          * one smart pass...
3842          */
3843         mask = 0x03 << (uframe + qh->gap_uf);
3844         *c_maskp = cpu_to_hc32(fusbh200, mask << 8);
3845 
3846         mask |= 1 << uframe;
3847         if (tt_no_collision (fusbh200, qh->period, qh->dev, frame, mask)) {
3848                 if (!check_period (fusbh200, frame, uframe + qh->gap_uf + 1,
3849                                         qh->period, qh->c_usecs))
3850                         goto done;
3851                 if (!check_period (fusbh200, frame, uframe + qh->gap_uf,
3852                                         qh->period, qh->c_usecs))
3853                         goto done;
3854                 retval = 0;
3855         }
3856 done:
3857         return retval;
3858 }
3859 
3860 /* "first fit" scheduling policy used the first time through,
3861  * or when the previous schedule slot can't be re-used.
3862  */
3863 static int qh_schedule(struct fusbh200_hcd *fusbh200, struct fusbh200_qh *qh)
3864 {
3865         int             status;
3866         unsigned        uframe;
3867         __hc32          c_mask;
3868         unsigned        frame;          /* 0..(qh->period - 1), or NO_FRAME */
3869         struct fusbh200_qh_hw   *hw = qh->hw;
3870 
3871         qh_refresh(fusbh200, qh);
3872         hw->hw_next = FUSBH200_LIST_END(fusbh200);
3873         frame = qh->start;
3874 
3875         /* reuse the previous schedule slots, if we can */
3876         if (frame < qh->period) {
3877                 uframe = ffs(hc32_to_cpup(fusbh200, &hw->hw_info2) & QH_SMASK);
3878                 status = check_intr_schedule (fusbh200, frame, --uframe,
3879                                 qh, &c_mask);
3880         } else {
3881                 uframe = 0;
3882                 c_mask = 0;
3883                 status = -ENOSPC;
3884         }
3885 
3886         /* else scan the schedule to find a group of slots such that all
3887          * uframes have enough periodic bandwidth available.
3888          */
3889         if (status) {
3890                 /* "normal" case, uframing flexible except with splits */
3891                 if (qh->period) {
3892                         int             i;
3893 
3894                         for (i = qh->period; status && i > 0; --i) {
3895                                 frame = ++fusbh200->random_frame % qh->period;
3896                                 for (uframe = 0; uframe < 8; uframe++) {
3897                                         status = check_intr_schedule (fusbh200,
3898                                                         frame, uframe, qh,
3899                                                         &c_mask);
3900                                         if (status == 0)
3901                                                 break;
3902                                 }
3903                         }
3904 
3905                 /* qh->period == 0 means every uframe */
3906                 } else {
3907                         frame = 0;
3908                         status = check_intr_schedule (fusbh200, 0, 0, qh, &c_mask);
3909                 }
3910                 if (status)
3911                         goto done;
3912                 qh->start = frame;
3913 
3914                 /* reset S-frame and (maybe) C-frame masks */
3915                 hw->hw_info2 &= cpu_to_hc32(fusbh200, ~(QH_CMASK | QH_SMASK));
3916                 hw->hw_info2 |= qh->period
3917                         ? cpu_to_hc32(fusbh200, 1 << uframe)
3918                         : cpu_to_hc32(fusbh200, QH_SMASK);
3919                 hw->hw_info2 |= c_mask;
3920         } else
3921                 fusbh200_dbg (fusbh200, "reused qh %p schedule\n", qh);
3922 
3923         /* stuff into the periodic schedule */
3924         qh_link_periodic(fusbh200, qh);
3925 done:
3926         return status;
3927 }
3928 
3929 static int intr_submit (
3930         struct fusbh200_hcd             *fusbh200,
3931         struct urb              *urb,
3932         struct list_head        *qtd_list,
3933         gfp_t                   mem_flags
3934 ) {
3935         unsigned                epnum;
3936         unsigned long           flags;
3937         struct fusbh200_qh              *qh;
3938         int                     status;
3939         struct list_head        empty;
3940 
3941         /* get endpoint and transfer/schedule data */
3942         epnum = urb->ep->desc.bEndpointAddress;
3943 
3944         spin_lock_irqsave (&fusbh200->lock, flags);
3945 
3946         if (unlikely(!HCD_HW_ACCESSIBLE(fusbh200_to_hcd(fusbh200)))) {
3947                 status = -ESHUTDOWN;
3948                 goto done_not_linked;
3949         }
3950         status = usb_hcd_link_urb_to_ep(fusbh200_to_hcd(fusbh200), urb);
3951         if (unlikely(status))
3952                 goto done_not_linked;
3953 
3954         /* get qh and force any scheduling errors */
3955         INIT_LIST_HEAD (&empty);
3956         qh = qh_append_tds(fusbh200, urb, &empty, epnum, &urb->ep->hcpriv);
3957         if (qh == NULL) {
3958                 status = -ENOMEM;
3959                 goto done;
3960         }
3961         if (qh->qh_state == QH_STATE_IDLE) {
3962                 if ((status = qh_schedule (fusbh200, qh)) != 0)
3963                         goto done;
3964         }
3965 
3966         /* then queue the urb's tds to the qh */
3967         qh = qh_append_tds(fusbh200, urb, qtd_list, epnum, &urb->ep->hcpriv);
3968         BUG_ON (qh == NULL);
3969 
3970         /* ... update usbfs periodic stats */
3971         fusbh200_to_hcd(fusbh200)->self.bandwidth_int_reqs++;
3972 
3973 done:
3974         if (unlikely(status))
3975                 usb_hcd_unlink_urb_from_ep(fusbh200_to_hcd(fusbh200), urb);
3976 done_not_linked:
3977         spin_unlock_irqrestore (&fusbh200->lock, flags);
3978         if (status)
3979                 qtd_list_free (fusbh200, urb, qtd_list);
3980 
3981         return status;
3982 }
3983 
3984 static void scan_intr(struct fusbh200_hcd *fusbh200)
3985 {
3986         struct fusbh200_qh              *qh;
3987 
3988         list_for_each_entry_safe(qh, fusbh200->qh_scan_next, &fusbh200->intr_qh_list,
3989                         intr_node) {
3990  rescan:
3991                 /* clean any finished work for this qh */
3992                 if (!list_empty(&qh->qtd_list)) {
3993                         int temp;
3994 
3995                         /*
3996                          * Unlinks could happen here; completion reporting
3997                          * drops the lock.  That's why fusbh200->qh_scan_next
3998                          * always holds the next qh to scan; if the next qh
3999                          * gets unlinked then fusbh200->qh_scan_next is adjusted
4000                          * in qh_unlink_periodic().
4001                          */
4002                         temp = qh_completions(fusbh200, qh);
4003                         if (unlikely(qh->needs_rescan ||
4004                                         (list_empty(&qh->qtd_list) &&
4005                                                 qh->qh_state == QH_STATE_LINKED)))
4006                                 start_unlink_intr(fusbh200, qh);
4007                         else if (temp != 0)
4008                                 goto rescan;
4009                 }
4010         }
4011 }
4012 
4013 /*-------------------------------------------------------------------------*/
4014 
4015 /* fusbh200_iso_stream ops work with both ITD and SITD */
4016 
4017 static struct fusbh200_iso_stream *
4018 iso_stream_alloc (gfp_t mem_flags)
4019 {
4020         struct fusbh200_iso_stream *stream;
4021 
4022         stream = kzalloc(sizeof *stream, mem_flags);
4023         if (likely (stream != NULL)) {
4024                 INIT_LIST_HEAD(&stream->td_list);
4025                 INIT_LIST_HEAD(&stream->free_list);
4026                 stream->next_uframe = -1;
4027         }
4028         return stream;
4029 }
4030 
4031 static void
4032 iso_stream_init (
4033         struct fusbh200_hcd             *fusbh200,
4034         struct fusbh200_iso_stream      *stream,
4035         struct usb_device       *dev,
4036         int                     pipe,
4037         unsigned                interval
4038 )
4039 {
4040         u32                     buf1;
4041         unsigned                epnum, maxp;
4042         int                     is_input;
4043         long                    bandwidth;
4044         unsigned                multi;
4045 
4046         /*
4047          * this might be a "high bandwidth" highspeed endpoint,
4048          * as encoded in the ep descriptor's wMaxPacket field
4049          */
4050         epnum = usb_pipeendpoint (pipe);
4051         is_input = usb_pipein (pipe) ? USB_DIR_IN : 0;
4052         maxp = usb_maxpacket(dev, pipe, !is_input);
4053         if (is_input) {
4054                 buf1 = (1 << 11);
4055         } else {
4056                 buf1 = 0;
4057         }
4058 
4059         maxp = max_packet(maxp);
4060         multi = hb_mult(maxp);
4061         buf1 |= maxp;
4062         maxp *= multi;
4063 
4064         stream->buf0 = cpu_to_hc32(fusbh200, (epnum << 8) | dev->devnum);
4065         stream->buf1 = cpu_to_hc32(fusbh200, buf1);
4066         stream->buf2 = cpu_to_hc32(fusbh200, multi);
4067 
4068         /* usbfs wants to report the average usecs per frame tied up
4069          * when transfers on this endpoint are scheduled ...
4070          */
4071         if (dev->speed == USB_SPEED_FULL) {
4072                 interval <<= 3;
4073                 stream->usecs = NS_TO_US(usb_calc_bus_time(dev->speed,
4074                                 is_input, 1, maxp));
4075                 stream->usecs /= 8;
4076         } else {
4077                 stream->highspeed = 1;
4078                 stream->usecs = HS_USECS_ISO (maxp);
4079         }
4080         bandwidth = stream->usecs * 8;
4081         bandwidth /= interval;
4082 
4083         stream->bandwidth = bandwidth;
4084         stream->udev = dev;
4085         stream->bEndpointAddress = is_input | epnum;
4086         stream->interval = interval;
4087         stream->maxp = maxp;
4088 }
4089 
4090 static struct fusbh200_iso_stream *
4091 iso_stream_find (struct fusbh200_hcd *fusbh200, struct urb *urb)
4092 {
4093         unsigned                epnum;
4094         struct fusbh200_iso_stream      *stream;
4095         struct usb_host_endpoint *ep;
4096         unsigned long           flags;
4097 
4098         epnum = usb_pipeendpoint (urb->pipe);
4099         if (usb_pipein(urb->pipe))
4100                 ep = urb->dev->ep_in[epnum];
4101         else
4102                 ep = urb->dev->ep_out[epnum];
4103 
4104         spin_lock_irqsave (&fusbh200->lock, flags);
4105         stream = ep->hcpriv;
4106 
4107         if (unlikely (stream == NULL)) {
4108                 stream = iso_stream_alloc(GFP_ATOMIC);
4109                 if (likely (stream != NULL)) {
4110                         ep->hcpriv = stream;
4111                         stream->ep = ep;
4112                         iso_stream_init(fusbh200, stream, urb->dev, urb->pipe,
4113                                         urb->interval);
4114                 }
4115 
4116         /* if dev->ep [epnum] is a QH, hw is set */
4117         } else if (unlikely (stream->hw != NULL)) {
4118                 fusbh200_dbg (fusbh200, "dev %s ep%d%s, not iso??\n",
4119                         urb->dev->devpath, epnum,
4120                         usb_pipein(urb->pipe) ? "in" : "out");
4121                 stream = NULL;
4122         }
4123 
4124         spin_unlock_irqrestore (&fusbh200->lock, flags);
4125         return stream;
4126 }
4127 
4128 /*-------------------------------------------------------------------------*/
4129 
4130 /* fusbh200_iso_sched ops can be ITD-only or SITD-only */
4131 
4132 static struct fusbh200_iso_sched *
4133 iso_sched_alloc (unsigned packets, gfp_t mem_flags)
4134 {
4135         struct fusbh200_iso_sched       *iso_sched;
4136         int                     size = sizeof *iso_sched;
4137 
4138         size += packets * sizeof (struct fusbh200_iso_packet);
4139         iso_sched = kzalloc(size, mem_flags);
4140         if (likely (iso_sched != NULL)) {
4141                 INIT_LIST_HEAD (&iso_sched->td_list);
4142         }
4143         return iso_sched;
4144 }
4145 
4146 static inline void
4147 itd_sched_init(
4148         struct fusbh200_hcd             *fusbh200,
4149         struct fusbh200_iso_sched       *iso_sched,
4150         struct fusbh200_iso_stream      *stream,
4151         struct urb              *urb
4152 )
4153 {
4154         unsigned        i;
4155         dma_addr_t      dma = urb->transfer_dma;
4156 
4157         /* how many uframes are needed for these transfers */
4158         iso_sched->span = urb->number_of_packets * stream->interval;
4159 
4160         /* figure out per-uframe itd fields that we'll need later
4161          * when we fit new itds into the schedule.
4162          */
4163         for (i = 0; i < urb->number_of_packets; i++) {
4164                 struct fusbh200_iso_packet      *uframe = &iso_sched->packet [i];
4165                 unsigned                length;
4166                 dma_addr_t              buf;
4167                 u32                     trans;
4168 
4169                 length = urb->iso_frame_desc [i].length;
4170                 buf = dma + urb->iso_frame_desc [i].offset;
4171 
4172                 trans = FUSBH200_ISOC_ACTIVE;
4173                 trans |= buf & 0x0fff;
4174                 if (unlikely (((i + 1) == urb->number_of_packets))
4175                                 && !(urb->transfer_flags & URB_NO_INTERRUPT))
4176                         trans |= FUSBH200_ITD_IOC;
4177                 trans |= length << 16;
4178                 uframe->transaction = cpu_to_hc32(fusbh200, trans);
4179 
4180                 /* might need to cross a buffer page within a uframe */
4181                 uframe->bufp = (buf & ~(u64)0x0fff);
4182                 buf += length;
4183                 if (unlikely ((uframe->bufp != (buf & ~(u64)0x0fff))))
4184                         uframe->cross = 1;
4185         }
4186 }
4187 
4188 static void
4189 iso_sched_free (
4190         struct fusbh200_iso_stream      *stream,
4191         struct fusbh200_iso_sched       *iso_sched
4192 )
4193 {
4194         if (!iso_sched)
4195                 return;
4196         // caller must hold fusbh200->lock!
4197         list_splice (&iso_sched->td_list, &stream->free_list);
4198         kfree (iso_sched);
4199 }
4200 
4201 static int
4202 itd_urb_transaction (
4203         struct fusbh200_iso_stream      *stream,
4204         struct fusbh200_hcd             *fusbh200,
4205         struct urb              *urb,
4206         gfp_t                   mem_flags
4207 )
4208 {
4209         struct fusbh200_itd             *itd;
4210         dma_addr_t              itd_dma;
4211         int                     i;
4212         unsigned                num_itds;
4213         struct fusbh200_iso_sched       *sched;
4214         unsigned long           flags;
4215 
4216         sched = iso_sched_alloc (urb->number_of_packets, mem_flags);
4217         if (unlikely (sched == NULL))
4218                 return -ENOMEM;
4219 
4220         itd_sched_init(fusbh200, sched, stream, urb);
4221 
4222         if (urb->interval < 8)
4223                 num_itds = 1 + (sched->span + 7) / 8;
4224         else
4225                 num_itds = urb->number_of_packets;
4226 
4227         /* allocate/init ITDs */
4228         spin_lock_irqsave (&fusbh200->lock, flags);
4229         for (i = 0; i < num_itds; i++) {
4230 
4231                 /*
4232                  * Use iTDs from the free list, but not iTDs that may
4233                  * still be in use by the hardware.
4234                  */
4235                 if (likely(!list_empty(&stream->free_list))) {
4236                         itd = list_first_entry(&stream->free_list,
4237                                         struct fusbh200_itd, itd_list);
4238                         if (itd->frame == fusbh200->now_frame)
4239                                 goto alloc_itd;
4240                         list_del (&itd->itd_list);
4241                         itd_dma = itd->itd_dma;
4242                 } else {
4243  alloc_itd:
4244                         spin_unlock_irqrestore (&fusbh200->lock, flags);
4245                         itd = dma_pool_alloc (fusbh200->itd_pool, mem_flags,
4246                                         &itd_dma);
4247                         spin_lock_irqsave (&fusbh200->lock, flags);
4248                         if (!itd) {
4249                                 iso_sched_free(stream, sched);
4250                                 spin_unlock_irqrestore(&fusbh200->lock, flags);
4251                                 return -ENOMEM;
4252                         }
4253                 }
4254 
4255                 memset (itd, 0, sizeof *itd);
4256                 itd->itd_dma = itd_dma;
4257                 list_add (&itd->itd_list, &sched->td_list);
4258         }
4259         spin_unlock_irqrestore (&fusbh200->lock, flags);
4260 
4261         /* temporarily store schedule info in hcpriv */
4262         urb->hcpriv = sched;
4263         urb->error_count = 0;
4264         return 0;
4265 }
4266 
4267 /*-------------------------------------------------------------------------*/
4268 
4269 static inline int
4270 itd_slot_ok (
4271         struct fusbh200_hcd             *fusbh200,
4272         u32                     mod,
4273         u32                     uframe,
4274         u8                      usecs,
4275         u32                     period
4276 )
4277 {
4278         uframe %= period;
4279         do {
4280                 /* can't commit more than uframe_periodic_max usec */
4281                 if (periodic_usecs (fusbh200, uframe >> 3, uframe & 0x7)
4282                                 > (fusbh200->uframe_periodic_max - usecs))
4283                         return 0;
4284 
4285                 /* we know urb->interval is 2^N uframes */
4286                 uframe += period;
4287         } while (uframe < mod);
4288         return 1;
4289 }
4290 
4291 /*
4292  * This scheduler plans almost as far into the future as it has actual
4293  * periodic schedule slots.  (Affected by TUNE_FLS, which defaults to
4294  * "as small as possible" to be cache-friendlier.)  That limits the size
4295  * transfers you can stream reliably; avoid more than 64 msec per urb.
4296  * Also avoid queue depths of less than fusbh200's worst irq latency (affected
4297  * by the per-urb URB_NO_INTERRUPT hint, the log2_irq_thresh module parameter,
4298  * and other factors); or more than about 230 msec total (for portability,
4299  * given FUSBH200_TUNE_FLS and the slop).  Or, write a smarter scheduler!
4300  */
4301 
4302 #define SCHEDULE_SLOP   80      /* microframes */
4303 
4304 static int
4305 iso_stream_schedule (
4306         struct fusbh200_hcd             *fusbh200,
4307         struct urb              *urb,
4308         struct fusbh200_iso_stream      *stream
4309 )
4310 {
4311         u32                     now, next, start, period, span;
4312         int                     status;
4313         unsigned                mod = fusbh200->periodic_size << 3;
4314         struct fusbh200_iso_sched       *sched = urb->hcpriv;
4315 
4316         period = urb->interval;
4317         span = sched->span;
4318 
4319         if (span > mod - SCHEDULE_SLOP) {
4320                 fusbh200_dbg (fusbh200, "iso request %p too long\n", urb);
4321                 status = -EFBIG;
4322                 goto fail;
4323         }
4324 
4325         now = fusbh200_read_frame_index(fusbh200) & (mod - 1);
4326 
4327         /* Typical case: reuse current schedule, stream is still active.
4328          * Hopefully there are no gaps from the host falling behind
4329          * (irq delays etc), but if there are we'll take the next
4330          * slot in the schedule, implicitly assuming URB_ISO_ASAP.
4331          */
4332         if (likely (!list_empty (&stream->td_list))) {
4333                 u32     excess;
4334 
4335                 /* For high speed devices, allow scheduling within the
4336                  * isochronous scheduling threshold.  For full speed devices
4337                  * and Intel PCI-based controllers, don't (work around for
4338                  * Intel ICH9 bug).
4339                  */
4340                 if (!stream->highspeed && fusbh200->fs_i_thresh)
4341                         next = now + fusbh200->i_thresh;
4342                 else
4343                         next = now;
4344 
4345                 /* Fell behind (by up to twice the slop amount)?
4346                  * We decide based on the time of the last currently-scheduled
4347                  * slot, not the time of the next available slot.
4348                  */
4349                 excess = (stream->next_uframe - period - next) & (mod - 1);
4350                 if (excess >= mod - 2 * SCHEDULE_SLOP)
4351                         start = next + excess - mod + period *
4352                                         DIV_ROUND_UP(mod - excess, period);
4353                 else
4354                         start = next + excess + period;
4355                 if (start - now >= mod) {
4356                         fusbh200_dbg(fusbh200, "request %p would overflow (%d+%d >= %d)\n",
4357                                         urb, start - now - period, period,
4358                                         mod);
4359                         status = -EFBIG;
4360                         goto fail;
4361                 }
4362         }
4363 
4364         /* need to schedule; when's the next (u)frame we could start?
4365          * this is bigger than fusbh200->i_thresh allows; scheduling itself
4366          * isn't free, the slop should handle reasonably slow cpus.  it
4367          * can also help high bandwidth if the dma and irq loads don't
4368          * jump until after the queue is primed.
4369          */
4370         else {
4371                 int done = 0;
4372                 start = SCHEDULE_SLOP + (now & ~0x07);
4373 
4374                 /* NOTE:  assumes URB_ISO_ASAP, to limit complexity/bugs */
4375 
4376                 /* find a uframe slot with enough bandwidth.
4377                  * Early uframes are more precious because full-speed
4378                  * iso IN transfers can't use late uframes,
4379                  * and therefore they should be allocated last.
4380                  */
4381                 next = start;
4382                 start += period;
4383                 do {
4384                         start--;
4385                         /* check schedule: enough space? */
4386                         if (itd_slot_ok(fusbh200, mod, start,
4387                                         stream->usecs, period))
4388                                 done = 1;
4389                 } while (start > next && !done);
4390 
4391                 /* no room in the schedule */
4392                 if (!done) {
4393                         fusbh200_dbg(fusbh200, "iso resched full %p (now %d max %d)\n",
4394                                 urb, now, now + mod);
4395                         status = -ENOSPC;
4396                         goto fail;
4397                 }
4398         }
4399 
4400         /* Tried to schedule too far into the future? */
4401         if (unlikely(start - now + span - period
4402                                 >= mod - 2 * SCHEDULE_SLOP)) {
4403                 fusbh200_dbg(fusbh200, "request %p would overflow (%d+%d >= %d)\n",
4404                                 urb, start - now, span - period,
4405                                 mod - 2 * SCHEDULE_SLOP);
4406                 status = -EFBIG;
4407                 goto fail;
4408         }
4409 
4410         stream->next_uframe = start & (mod - 1);
4411 
4412         /* report high speed start in uframes; full speed, in frames */
4413         urb->start_frame = stream->next_uframe;
4414         if (!stream->highspeed)
4415                 urb->start_frame >>= 3;
4416 
4417         /* Make sure scan_isoc() sees these */
4418         if (fusbh200->isoc_count == 0)
4419                 fusbh200->next_frame = now >> 3;
4420         return 0;
4421 
4422  fail:
4423         iso_sched_free(stream, sched);
4424         urb->hcpriv = NULL;
4425         return status;
4426 }
4427 
4428 /*-------------------------------------------------------------------------*/
4429 
4430 static inline void
4431 itd_init(struct fusbh200_hcd *fusbh200, struct fusbh200_iso_stream *stream,
4432                 struct fusbh200_itd *itd)
4433 {
4434         int i;
4435 
4436         /* it's been recently zeroed */
4437         itd->hw_next = FUSBH200_LIST_END(fusbh200);
4438         itd->hw_bufp [0] = stream->buf0;
4439         itd->hw_bufp [1] = stream->buf1;
4440         itd->hw_bufp [2] = stream->buf2;
4441 
4442         for (i = 0; i < 8; i++)
4443                 itd->index[i] = -1;
4444 
4445         /* All other fields are filled when scheduling */
4446 }
4447 
4448 static inline void
4449 itd_patch(
4450         struct fusbh200_hcd             *fusbh200,
4451         struct fusbh200_itd             *itd,
4452         struct fusbh200_iso_sched       *iso_sched,
4453         unsigned                index,
4454         u16                     uframe
4455 )
4456 {
4457         struct fusbh200_iso_packet      *uf = &iso_sched->packet [index];
4458         unsigned                pg = itd->pg;
4459 
4460         // BUG_ON (pg == 6 && uf->cross);
4461 
4462         uframe &= 0x07;
4463         itd->index [uframe] = index;
4464 
4465         itd->hw_transaction[uframe] = uf->transaction;
4466         itd->hw_transaction[uframe] |= cpu_to_hc32(fusbh200, pg << 12);
4467         itd->hw_bufp[pg] |= cpu_to_hc32(fusbh200, uf->bufp & ~(u32)0);
4468         itd->hw_bufp_hi[pg] |= cpu_to_hc32(fusbh200, (u32)(uf->bufp >> 32));
4469 
4470         /* iso_frame_desc[].offset must be strictly increasing */
4471         if (unlikely (uf->cross)) {
4472                 u64     bufp = uf->bufp + 4096;
4473 
4474                 itd->pg = ++pg;
4475                 itd->hw_bufp[pg] |= cpu_to_hc32(fusbh200, bufp & ~(u32)0);
4476                 itd->hw_bufp_hi[pg] |= cpu_to_hc32(fusbh200, (u32)(bufp >> 32));
4477         }
4478 }
4479 
4480 static inline void
4481 itd_link (struct fusbh200_hcd *fusbh200, unsigned frame, struct fusbh200_itd *itd)
4482 {
4483         union fusbh200_shadow   *prev = &fusbh200->pshadow[frame];
4484         __hc32                  *hw_p = &fusbh200->periodic[frame];
4485         union fusbh200_shadow   here = *prev;
4486         __hc32                  type = 0;
4487 
4488         /* skip any iso nodes which might belong to previous microframes */
4489         while (here.ptr) {
4490                 type = Q_NEXT_TYPE(fusbh200, *hw_p);
4491                 if (type == cpu_to_hc32(fusbh200, Q_TYPE_QH))
4492                         break;
4493                 prev = periodic_next_shadow(fusbh200, prev, type);
4494                 hw_p = shadow_next_periodic(fusbh200, &here, type);
4495                 here = *prev;
4496         }
4497 
4498         itd->itd_next = here;
4499         itd->hw_next = *hw_p;
4500         prev->itd = itd;
4501         itd->frame = frame;
4502         wmb ();
4503         *hw_p = cpu_to_hc32(fusbh200, itd->itd_dma | Q_TYPE_ITD);
4504 }
4505 
4506 /* fit urb's itds into the selected schedule slot; activate as needed */
4507 static void itd_link_urb(
4508         struct fusbh200_hcd             *fusbh200,
4509         struct urb              *urb,
4510         unsigned                mod,
4511         struct fusbh200_iso_stream      *stream
4512 )
4513 {
4514         int                     packet;
4515         unsigned                next_uframe, uframe, frame;
4516         struct fusbh200_iso_sched       *iso_sched = urb->hcpriv;
4517         struct fusbh200_itd             *itd;
4518 
4519         next_uframe = stream->next_uframe & (mod - 1);
4520 
4521         if (unlikely (list_empty(&stream->td_list))) {
4522                 fusbh200_to_hcd(fusbh200)->self.bandwidth_allocated
4523                                 += stream->bandwidth;
4524                 fusbh200_dbg(fusbh200,
4525                         "schedule devp %s ep%d%s-iso period %d start %d.%d\n",
4526                         urb->dev->devpath, stream->bEndpointAddress & 0x0f,
4527                         (stream->bEndpointAddress & USB_DIR_IN) ? "in" : "out",
4528                         urb->interval,
4529                         next_uframe >> 3, next_uframe & 0x7);
4530         }
4531 
4532         /* fill iTDs uframe by uframe */
4533         for (packet = 0, itd = NULL; packet < urb->number_of_packets; ) {
4534                 if (itd == NULL) {
4535                         /* ASSERT:  we have all necessary itds */
4536                         // BUG_ON (list_empty (&iso_sched->td_list));
4537 
4538                         /* ASSERT:  no itds for this endpoint in this uframe */
4539 
4540                         itd = list_entry (iso_sched->td_list.next,
4541                                         struct fusbh200_itd, itd_list);
4542                         list_move_tail (&itd->itd_list, &stream->td_list);
4543                         itd->stream = stream;
4544                         itd->urb = urb;
4545                         itd_init (fusbh200, stream, itd);
4546                 }
4547 
4548                 uframe = next_uframe & 0x07;
4549                 frame = next_uframe >> 3;
4550 
4551                 itd_patch(fusbh200, itd, iso_sched, packet, uframe);
4552 
4553                 next_uframe += stream->interval;
4554                 next_uframe &= mod - 1;
4555                 packet++;
4556 
4557                 /* link completed itds into the schedule */
4558                 if (((next_uframe >> 3) != frame)
4559                                 || packet == urb->number_of_packets) {
4560                         itd_link(fusbh200, frame & (fusbh200->periodic_size - 1), itd);
4561                         itd = NULL;
4562                 }
4563         }
4564         stream->next_uframe = next_uframe;
4565 
4566         /* don't need that schedule data any more */
4567         iso_sched_free (stream, iso_sched);
4568         urb->hcpriv = NULL;
4569 
4570         ++fusbh200->isoc_count;
4571         enable_periodic(fusbh200);
4572 }
4573 
4574 #define ISO_ERRS (FUSBH200_ISOC_BUF_ERR | FUSBH200_ISOC_BABBLE | FUSBH200_ISOC_XACTERR)
4575 
4576 /* Process and recycle a completed ITD.  Return true iff its urb completed,
4577  * and hence its completion callback probably added things to the hardware
4578  * schedule.
4579  *
4580  * Note that we carefully avoid recycling this descriptor until after any
4581  * completion callback runs, so that it won't be reused quickly.  That is,
4582  * assuming (a) no more than two urbs per frame on this endpoint, and also
4583  * (b) only this endpoint's completions submit URBs.  It seems some silicon
4584  * corrupts things if you reuse completed descriptors very quickly...
4585  */
4586 static bool itd_complete(struct fusbh200_hcd *fusbh200, struct fusbh200_itd *itd)
4587 {
4588         struct urb                              *urb = itd->urb;
4589         struct usb_iso_packet_descriptor        *desc;
4590         u32                                     t;
4591         unsigned                                uframe;
4592         int                                     urb_index = -1;
4593         struct fusbh200_iso_stream                      *stream = itd->stream;
4594         struct usb_device                       *dev;
4595         bool                                    retval = false;
4596 
4597         /* for each uframe with a packet */
4598         for (uframe = 0; uframe < 8; uframe++) {
4599                 if (likely (itd->index[uframe] == -1))
4600                         continue;
4601                 urb_index = itd->index[uframe];
4602                 desc = &urb->iso_frame_desc [urb_index];
4603 
4604                 t = hc32_to_cpup(fusbh200, &itd->hw_transaction [uframe]);
4605                 itd->hw_transaction [uframe] = 0;
4606 
4607                 /* report transfer status */
4608                 if (unlikely (t & ISO_ERRS)) {
4609                         urb->error_count++;
4610                         if (t & FUSBH200_ISOC_BUF_ERR)
4611                                 desc->status = usb_pipein (urb->pipe)
4612                                         ? -ENOSR  /* hc couldn't read */
4613                                         : -ECOMM; /* hc couldn't write */
4614                         else if (t & FUSBH200_ISOC_BABBLE)
4615                                 desc->status = -EOVERFLOW;
4616                         else /* (t & FUSBH200_ISOC_XACTERR) */
4617                                 desc->status = -EPROTO;
4618 
4619                         /* HC need not update length with this error */
4620                         if (!(t & FUSBH200_ISOC_BABBLE)) {
4621                                 desc->actual_length = fusbh200_itdlen(urb, desc, t);
4622                                 urb->actual_length += desc->actual_length;
4623                         }
4624                 } else if (likely ((t & FUSBH200_ISOC_ACTIVE) == 0)) {
4625                         desc->status = 0;
4626                         desc->actual_length = fusbh200_itdlen(urb, desc, t);
4627                         urb->actual_length += desc->actual_length;
4628                 } else {
4629                         /* URB was too late */
4630                         desc->status = -EXDEV;
4631                 }
4632         }
4633 
4634         /* handle completion now? */
4635         if (likely ((urb_index + 1) != urb->number_of_packets))
4636                 goto done;
4637 
4638         /* ASSERT: it's really the last itd for this urb
4639         list_for_each_entry (itd, &stream->td_list, itd_list)
4640                 BUG_ON (itd->urb == urb);
4641          */
4642 
4643         /* give urb back to the driver; completion often (re)submits */
4644         dev = urb->dev;
4645         fusbh200_urb_done(fusbh200, urb, 0);
4646         retval = true;
4647         urb = NULL;
4648 
4649         --fusbh200->isoc_count;
4650         disable_periodic(fusbh200);
4651 
4652         if (unlikely(list_is_singular(&stream->td_list))) {
4653                 fusbh200_to_hcd(fusbh200)->self.bandwidth_allocated
4654                                 -= stream->bandwidth;
4655                 fusbh200_dbg(fusbh200,
4656                         "deschedule devp %s ep%d%s-iso\n",
4657                         dev->devpath, stream->bEndpointAddress & 0x0f,
4658                         (stream->bEndpointAddress & USB_DIR_IN) ? "in" : "out");
4659         }
4660 
4661 done:
4662         itd->urb = NULL;
4663 
4664         /* Add to the end of the free list for later reuse */
4665         list_move_tail(&itd->itd_list, &stream->free_list);
4666 
4667         /* Recycle the iTDs when the pipeline is empty (ep no longer in use) */
4668         if (list_empty(&stream->td_list)) {
4669                 list_splice_tail_init(&stream->free_list,
4670                                 &fusbh200->cached_itd_list);
4671                 start_free_itds(fusbh200);
4672         }
4673 
4674         return retval;
4675 }
4676 
4677 /*-------------------------------------------------------------------------*/
4678 
4679 static int itd_submit (struct fusbh200_hcd *fusbh200, struct urb *urb,
4680         gfp_t mem_flags)
4681 {
4682         int                     status = -EINVAL;
4683         unsigned long           flags;
4684         struct fusbh200_iso_stream      *stream;
4685 
4686         /* Get iso_stream head */
4687         stream = iso_stream_find (fusbh200, urb);
4688         if (unlikely (stream == NULL)) {
4689                 fusbh200_dbg (fusbh200, "can't get iso stream\n");
4690                 return -ENOMEM;
4691         }
4692         if (unlikely (urb->interval != stream->interval &&
4693                       fusbh200_port_speed(fusbh200, 0) == USB_PORT_STAT_HIGH_SPEED)) {
4694                         fusbh200_dbg (fusbh200, "can't change iso interval %d --> %d\n",
4695                                 stream->interval, urb->interval);
4696                         goto done;
4697         }
4698 
4699 #ifdef FUSBH200_URB_TRACE
4700         fusbh200_dbg (fusbh200,
4701                 "%s %s urb %p ep%d%s len %d, %d pkts %d uframes [%p]\n",
4702                 __func__, urb->dev->devpath, urb,
4703                 usb_pipeendpoint (urb->pipe),
4704                 usb_pipein (urb->pipe) ? "in" : "out",
4705                 urb->transfer_buffer_length,
4706                 urb->number_of_packets, urb->interval,
4707                 stream);
4708 #endif
4709 
4710         /* allocate ITDs w/o locking anything */
4711         status = itd_urb_transaction (stream, fusbh200, urb, mem_flags);
4712         if (unlikely (status < 0)) {
4713                 fusbh200_dbg (fusbh200, "can't init itds\n");
4714                 goto done;
4715         }
4716 
4717         /* schedule ... need to lock */
4718         spin_lock_irqsave (&fusbh200->lock, flags);
4719         if (unlikely(!HCD_HW_ACCESSIBLE(fusbh200_to_hcd(fusbh200)))) {
4720                 status = -ESHUTDOWN;
4721                 goto done_not_linked;
4722         }
4723         status = usb_hcd_link_urb_to_ep(fusbh200_to_hcd(fusbh200), urb);
4724         if (unlikely(status))
4725                 goto done_not_linked;
4726         status = iso_stream_schedule(fusbh200, urb, stream);
4727         if (likely (status == 0))
4728                 itd_link_urb (fusbh200, urb, fusbh200->periodic_size << 3, stream);
4729         else
4730                 usb_hcd_unlink_urb_from_ep(fusbh200_to_hcd(fusbh200), urb);
4731  done_not_linked:
4732         spin_unlock_irqrestore (&fusbh200->lock, flags);
4733  done:
4734         return status;
4735 }
4736 
4737 /*-------------------------------------------------------------------------*/
4738 
4739 static void scan_isoc(struct fusbh200_hcd *fusbh200)
4740 {
4741         unsigned        uf, now_frame, frame;
4742         unsigned        fmask = fusbh200->periodic_size - 1;
4743         bool            modified, live;
4744 
4745         /*
4746          * When running, scan from last scan point up to "now"
4747          * else clean up by scanning everything that's left.
4748          * Touches as few pages as possible:  cache-friendly.
4749          */
4750         if (fusbh200->rh_state >= FUSBH200_RH_RUNNING) {
4751                 uf = fusbh200_read_frame_index(fusbh200);
4752                 now_frame = (uf >> 3) & fmask;
4753                 live = true;
4754         } else  {
4755                 now_frame = (fusbh200->next_frame - 1) & fmask;
4756                 live = false;
4757         }
4758         fusbh200->now_frame = now_frame;
4759 
4760         frame = fusbh200->next_frame;
4761         for (;;) {
4762                 union fusbh200_shadow   q, *q_p;
4763                 __hc32                  type, *hw_p;
4764 
4765 restart:
4766                 /* scan each element in frame's queue for completions */
4767                 q_p = &fusbh200->pshadow [frame];
4768                 hw_p = &fusbh200->periodic [frame];
4769                 q.ptr = q_p->ptr;
4770                 type = Q_NEXT_TYPE(fusbh200, *hw_p);
4771                 modified = false;
4772 
4773                 while (q.ptr != NULL) {
4774                         switch (hc32_to_cpu(fusbh200, type)) {
4775                         case Q_TYPE_ITD:
4776                                 /* If this ITD is still active, leave it for
4777                                  * later processing ... check the next entry.
4778                                  * No need to check for activity unless the
4779                                  * frame is current.
4780                                  */
4781                                 if (frame == now_frame && live) {
4782                                         rmb();
4783                                         for (uf = 0; uf < 8; uf++) {
4784                                                 if (q.itd->hw_transaction[uf] &
4785                                                             ITD_ACTIVE(fusbh200))
4786                                                         break;
4787                                         }
4788                                         if (uf < 8) {
4789                                                 q_p = &q.itd->itd_next;
4790                                                 hw_p = &q.itd->hw_next;
4791                                                 type = Q_NEXT_TYPE(fusbh200,
4792                                                         q.itd->hw_next);
4793                                                 q = *q_p;
4794                                                 break;
4795                                         }
4796                                 }
4797 
4798                                 /* Take finished ITDs out of the schedule
4799                                  * and process them:  recycle, maybe report
4800                                  * URB completion.  HC won't cache the
4801                                  * pointer for much longer, if at all.
4802                                  */
4803                                 *q_p = q.itd->itd_next;
4804                                 *hw_p = q.itd->hw_next;
4805                                 type = Q_NEXT_TYPE(fusbh200, q.itd->hw_next);
4806                                 wmb();
4807                                 modified = itd_complete (fusbh200, q.itd);
4808                                 q = *q_p;
4809                                 break;
4810                         default:
4811                                 fusbh200_dbg(fusbh200, "corrupt type %d frame %d shadow %p\n",
4812                                         type, frame, q.ptr);
4813                                 // BUG ();
4814                                 /* FALL THROUGH */
4815                         case Q_TYPE_QH:
4816                         case Q_TYPE_FSTN:
4817                                 /* End of the iTDs and siTDs */
4818                                 q.ptr = NULL;
4819                                 break;
4820                         }
4821 
4822                         /* assume completion callbacks modify the queue */
4823                         if (unlikely(modified && fusbh200->isoc_count > 0))
4824                                 goto restart;
4825                 }
4826 
4827                 /* Stop when we have reached the current frame */
4828                 if (frame == now_frame)
4829                         break;
4830                 frame = (frame + 1) & fmask;
4831         }
4832         fusbh200->next_frame = now_frame;
4833 }
4834 /*-------------------------------------------------------------------------*/
4835 /*
4836  * Display / Set uframe_periodic_max
4837  */
4838 static ssize_t show_uframe_periodic_max(struct device *dev,
4839                                         struct device_attribute *attr,
4840                                         char *buf)
4841 {
4842         struct fusbh200_hcd             *fusbh200;
4843         int                     n;
4844 
4845         fusbh200 = hcd_to_fusbh200(bus_to_hcd(dev_get_drvdata(dev)));
4846         n = scnprintf(buf, PAGE_SIZE, "%d\n", fusbh200->uframe_periodic_max);
4847         return n;
4848 }
4849 
4850 
4851 static ssize_t store_uframe_periodic_max(struct device *dev,
4852                                         struct device_attribute *attr,
4853                                         const char *buf, size_t count)
4854 {
4855         struct fusbh200_hcd             *fusbh200;
4856         unsigned                uframe_periodic_max;
4857         unsigned                frame, uframe;
4858         unsigned short          allocated_max;
4859         unsigned long           flags;
4860         ssize_t                 ret;
4861 
4862         fusbh200 = hcd_to_fusbh200(bus_to_hcd(dev_get_drvdata(dev)));
4863         if (kstrtouint(buf, 0, &uframe_periodic_max) < 0)
4864                 return -EINVAL;
4865 
4866         if (uframe_periodic_max < 100 || uframe_periodic_max >= 125) {
4867                 fusbh200_info(fusbh200, "rejecting invalid request for "
4868                                 "uframe_periodic_max=%u\n", uframe_periodic_max);
4869                 return -EINVAL;
4870         }
4871 
4872         ret = -EINVAL;
4873 
4874         /*
4875          * lock, so that our checking does not race with possible periodic
4876          * bandwidth allocation through submitting new urbs.
4877          */
4878         spin_lock_irqsave (&fusbh200->lock, flags);
4879 
4880         /*
4881          * for request to decrease max periodic bandwidth, we have to check
4882          * every microframe in the schedule to see whether the decrease is
4883          * possible.
4884          */
4885         if (uframe_periodic_max < fusbh200->uframe_periodic_max) {
4886                 allocated_max = 0;
4887 
4888                 for (frame = 0; frame < fusbh200->periodic_size; ++frame)
4889                         for (uframe = 0; uframe < 7; ++uframe)
4890                                 allocated_max = max(allocated_max,
4891                                                     periodic_usecs (fusbh200, frame, uframe));
4892 
4893                 if (allocated_max > uframe_periodic_max) {
4894                         fusbh200_info(fusbh200,
4895                                 "cannot decrease uframe_periodic_max because "
4896                                 "periodic bandwidth is already allocated "
4897                                 "(%u > %u)\n",
4898                                 allocated_max, uframe_periodic_max);
4899                         goto out_unlock;
4900                 }
4901         }
4902 
4903         /* increasing is always ok */
4904 
4905         fusbh200_info(fusbh200, "setting max periodic bandwidth to %u%% "
4906                         "(== %u usec/uframe)\n",
4907                         100*uframe_periodic_max/125, uframe_periodic_max);
4908 
4909         if (uframe_periodic_max != 100)
4910                 fusbh200_warn(fusbh200, "max periodic bandwidth set is non-standard\n");
4911 
4912         fusbh200->uframe_periodic_max = uframe_periodic_max;
4913         ret = count;
4914 
4915 out_unlock:
4916         spin_unlock_irqrestore (&fusbh200->lock, flags);
4917         return ret;
4918 }
4919 static DEVICE_ATTR(uframe_periodic_max, 0644, show_uframe_periodic_max, store_uframe_periodic_max);
4920 
4921 
4922 static inline int create_sysfs_files(struct fusbh200_hcd *fusbh200)
4923 {
4924         struct device   *controller = fusbh200_to_hcd(fusbh200)->self.controller;
4925         int     i = 0;
4926 
4927         if (i)
4928                 goto out;
4929 
4930         i = device_create_file(controller, &dev_attr_uframe_periodic_max);
4931 out:
4932         return i;
4933 }
4934 
4935 static inline void remove_sysfs_files(struct fusbh200_hcd *fusbh200)
4936 {
4937         struct device   *controller = fusbh200_to_hcd(fusbh200)->self.controller;
4938 
4939         device_remove_file(controller, &dev_attr_uframe_periodic_max);
4940 }
4941 /*-------------------------------------------------------------------------*/
4942 
4943 /* On some systems, leaving remote wakeup enabled prevents system shutdown.
4944  * The firmware seems to think that powering off is a wakeup event!
4945  * This routine turns off remote wakeup and everything else, on all ports.
4946  */
4947 static void fusbh200_turn_off_all_ports(struct fusbh200_hcd *fusbh200)
4948 {
4949         u32 __iomem *status_reg = &fusbh200->regs->port_status;
4950 
4951         fusbh200_writel(fusbh200, PORT_RWC_BITS, status_reg);
4952 }
4953 
4954 /*
4955  * Halt HC, turn off all ports, and let the BIOS use the companion controllers.
4956  * Must be called with interrupts enabled and the lock not held.
4957  */
4958 static void fusbh200_silence_controller(struct fusbh200_hcd *fusbh200)
4959 {
4960         fusbh200_halt(fusbh200);
4961 
4962         spin_lock_irq(&fusbh200->lock);
4963         fusbh200->rh_state = FUSBH200_RH_HALTED;
4964         fusbh200_turn_off_all_ports(fusbh200);
4965         spin_unlock_irq(&fusbh200->lock);
4966 }
4967 
4968 /* fusbh200_shutdown kick in for silicon on any bus (not just pci, etc).
4969  * This forcibly disables dma and IRQs, helping kexec and other cases
4970  * where the next system software may expect clean state.
4971  */
4972 static void fusbh200_shutdown(struct usb_hcd *hcd)
4973 {
4974         struct fusbh200_hcd     *fusbh200 = hcd_to_fusbh200(hcd);
4975 
4976         spin_lock_irq(&fusbh200->lock);
4977         fusbh200->shutdown = true;
4978         fusbh200->rh_state = FUSBH200_RH_STOPPING;
4979         fusbh200->enabled_hrtimer_events = 0;
4980         spin_unlock_irq(&fusbh200->lock);
4981 
4982         fusbh200_silence_controller(fusbh200);
4983 
4984         hrtimer_cancel(&fusbh200->hrtimer);
4985 }
4986 
4987 /*-------------------------------------------------------------------------*/
4988 
4989 /*
4990  * fusbh200_work is called from some interrupts, timers, and so on.
4991  * it calls driver completion functions, after dropping fusbh200->lock.
4992  */
4993 static void fusbh200_work (struct fusbh200_hcd *fusbh200)
4994 {
4995         /* another CPU may drop fusbh200->lock during a schedule scan while
4996          * it reports urb completions.  this flag guards against bogus
4997          * attempts at re-entrant schedule scanning.
4998          */
4999         if (fusbh200->scanning) {
5000                 fusbh200->need_rescan = true;
5001                 return;
5002         }
5003         fusbh200->scanning = true;
5004 
5005  rescan:
5006         fusbh200->need_rescan = false;
5007         if (fusbh200->async_count)
5008                 scan_async(fusbh200);
5009         if (fusbh200->intr_count > 0)
5010                 scan_intr(fusbh200);
5011         if (fusbh200->isoc_count > 0)
5012                 scan_isoc(fusbh200);
5013         if (fusbh200->need_rescan)
5014                 goto rescan;
5015         fusbh200->scanning = false;
5016 
5017         /* the IO watchdog guards against hardware or driver bugs that
5018          * misplace IRQs, and should let us run completely without IRQs.
5019          * such lossage has been observed on both VT6202 and VT8235.
5020          */
5021         turn_on_io_watchdog(fusbh200);
5022 }
5023 
5024 /*
5025  * Called when the fusbh200_hcd module is removed.
5026  */
5027 static void fusbh200_stop (struct usb_hcd *hcd)
5028 {
5029         struct fusbh200_hcd             *fusbh200 = hcd_to_fusbh200 (hcd);
5030 
5031         fusbh200_dbg (fusbh200, "stop\n");
5032 
5033         /* no more interrupts ... */
5034 
5035         spin_lock_irq(&fusbh200->lock);
5036         fusbh200->enabled_hrtimer_events = 0;
5037         spin_unlock_irq(&fusbh200->lock);
5038 
5039         fusbh200_quiesce(fusbh200);
5040         fusbh200_silence_controller(fusbh200);
5041         fusbh200_reset (fusbh200);
5042 
5043         hrtimer_cancel(&fusbh200->hrtimer);
5044         remove_sysfs_files(fusbh200);
5045         remove_debug_files (fusbh200);
5046 
5047         /* root hub is shut down separately (first, when possible) */
5048         spin_lock_irq (&fusbh200->lock);
5049         end_free_itds(fusbh200);
5050         spin_unlock_irq (&fusbh200->lock);
5051         fusbh200_mem_cleanup (fusbh200);
5052 
5053         fusbh200_dbg(fusbh200, "irq normal %ld err %ld iaa %ld (lost %ld)\n",
5054                 fusbh200->stats.normal, fusbh200->stats.error, fusbh200->stats.iaa,
5055                 fusbh200->stats.lost_iaa);
5056         fusbh200_dbg (fusbh200, "complete %ld unlink %ld\n",
5057                 fusbh200->stats.complete, fusbh200->stats.unlink);
5058 
5059         dbg_status (fusbh200, "fusbh200_stop completed",
5060                     fusbh200_readl(fusbh200, &fusbh200->regs->status));
5061 }
5062 
5063 /* one-time init, only for memory state */
5064 static int hcd_fusbh200_init(struct usb_hcd *hcd)
5065 {
5066         struct fusbh200_hcd             *fusbh200 = hcd_to_fusbh200(hcd);
5067         u32                     temp;
5068         int                     retval;
5069         u32                     hcc_params;
5070         struct fusbh200_qh_hw   *hw;
5071 
5072         spin_lock_init(&fusbh200->lock);
5073 
5074         /*
5075          * keep io watchdog by default, those good HCDs could turn off it later
5076          */
5077         fusbh200->need_io_watchdog = 1;
5078 
5079         hrtimer_init(&fusbh200->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
5080         fusbh200->hrtimer.function = fusbh200_hrtimer_func;
5081         fusbh200->next_hrtimer_event = FUSBH200_HRTIMER_NO_EVENT;
5082 
5083         hcc_params = fusbh200_readl(fusbh200, &fusbh200->caps->hcc_params);
5084 
5085         /*
5086          * by default set standard 80% (== 100 usec/uframe) max periodic
5087          * bandwidth as required by USB 2.0
5088          */
5089         fusbh200->uframe_periodic_max = 100;
5090 
5091         /*
5092          * hw default: 1K periodic list heads, one per frame.
5093          * periodic_size can shrink by USBCMD update if hcc_params allows.
5094          */
5095         fusbh200->periodic_size = DEFAULT_I_TDPS;
5096         INIT_LIST_HEAD(&fusbh200->intr_qh_list);
5097         INIT_LIST_HEAD(&fusbh200->cached_itd_list);
5098 
5099         if (HCC_PGM_FRAMELISTLEN(hcc_params)) {
5100                 /* periodic schedule size can be smaller than default */
5101                 switch (FUSBH200_TUNE_FLS) {
5102                 case 0: fusbh200->periodic_size = 1024; break;
5103                 case 1: fusbh200->periodic_size = 512; break;
5104                 case 2: fusbh200->periodic_size = 256; break;
5105                 default:        BUG();
5106                 }
5107         }
5108         if ((retval = fusbh200_mem_init(fusbh200, GFP_KERNEL)) < 0)
5109                 return retval;
5110 
5111         /* controllers may cache some of the periodic schedule ... */
5112         fusbh200->i_thresh = 2;
5113 
5114         /*
5115          * dedicate a qh for the async ring head, since we couldn't unlink
5116          * a 'real' qh without stopping the async schedule [4.8].  use it
5117          * as the 'reclamation list head' too.
5118          * its dummy is used in hw_alt_next of many tds, to prevent the qh
5119          * from automatically advancing to the next td after short reads.
5120          */
5121         fusbh200->async->qh_next.qh = NULL;
5122         hw = fusbh200->async->hw;
5123         hw->hw_next = QH_NEXT(fusbh200, fusbh200->async->qh_dma);
5124         hw->hw_info1 = cpu_to_hc32(fusbh200, QH_HEAD);
5125         hw->hw_token = cpu_to_hc32(fusbh200, QTD_STS_HALT);
5126         hw->hw_qtd_next = FUSBH200_LIST_END(fusbh200);
5127         fusbh200->async->qh_state = QH_STATE_LINKED;
5128         hw->hw_alt_next = QTD_NEXT(fusbh200, fusbh200->async->dummy->qtd_dma);
5129 
5130         /* clear interrupt enables, set irq latency */
5131         if (log2_irq_thresh < 0 || log2_irq_thresh > 6)
5132                 log2_irq_thresh = 0;
5133         temp = 1 << (16 + log2_irq_thresh);
5134         if (HCC_CANPARK(hcc_params)) {
5135                 /* HW default park == 3, on hardware that supports it (like
5136                  * NVidia and ALI silicon), maximizes throughput on the async
5137                  * schedule by avoiding QH fetches between transfers.
5138                  *
5139                  * With fast usb storage devices and NForce2, "park" seems to
5140                  * make problems:  throughput reduction (!), data errors...
5141                  */
5142                 if (park) {
5143                         park = min(park, (unsigned) 3);
5144                         temp |= CMD_PARK;
5145                         temp |= park << 8;
5146                 }
5147                 fusbh200_dbg(fusbh200, "park %d\n", park);
5148         }
5149         if (HCC_PGM_FRAMELISTLEN(hcc_params)) {
5150                 /* periodic schedule size can be smaller than default */
5151                 temp &= ~(3 << 2);
5152                 temp |= (FUSBH200_TUNE_FLS << 2);
5153         }
5154         fusbh200->command = temp;
5155 
5156         /* Accept arbitrarily long scatter-gather lists */
5157         if (!(hcd->driver->flags & HCD_LOCAL_MEM))
5158                 hcd->self.sg_tablesize = ~0;
5159         return 0;
5160 }
5161 
5162 /* start HC running; it's halted, hcd_fusbh200_init() has been run (once) */
5163 static int fusbh200_run (struct usb_hcd *hcd)
5164 {
5165         struct fusbh200_hcd             *fusbh200 = hcd_to_fusbh200 (hcd);
5166         u32                     temp;
5167         u32                     hcc_params;
5168 
5169         hcd->uses_new_polling = 1;
5170 
5171         /* EHCI spec section 4.1 */
5172 
5173         fusbh200_writel(fusbh200, fusbh200->periodic_dma, &fusbh200->regs->frame_list);
5174         fusbh200_writel(fusbh200, (u32)fusbh200->async->qh_dma, &fusbh200->regs->async_next);
5175 
5176         /*
5177          * hcc_params controls whether fusbh200->regs->segment must (!!!)
5178          * be used; it constrains QH/ITD/SITD and QTD locations.
5179          * pci_pool consistent memory always uses segment zero.
5180          * streaming mappings for I/O buffers, like pci_map_single(),
5181          * can return segments above 4GB, if the device allows.
5182          *
5183          * NOTE:  the dma mask is visible through dma_supported(), so
5184          * drivers can pass this info along ... like NETIF_F_HIGHDMA,
5185          * Scsi_Host.highmem_io, and so forth.  It's readonly to all
5186          * host side drivers though.
5187          */
5188         hcc_params = fusbh200_readl(fusbh200, &fusbh200->caps->hcc_params);
5189 
5190         // Philips, Intel, and maybe others need CMD_RUN before the
5191         // root hub will detect new devices (why?); NEC doesn't
5192         fusbh200->command &= ~(CMD_IAAD|CMD_PSE|CMD_ASE|CMD_RESET);
5193         fusbh200->command |= CMD_RUN;
5194         fusbh200_writel(fusbh200, fusbh200->command, &fusbh200->regs->command);
5195         dbg_cmd (fusbh200, "init", fusbh200->command);
5196 
5197         /*
5198          * Start, enabling full USB 2.0 functionality ... usb 1.1 devices
5199          * are explicitly handed to companion controller(s), so no TT is
5200          * involved with the root hub.  (Except where one is integrated,
5201          * and there's no companion controller unless maybe for USB OTG.)
5202          *
5203          * Turning on the CF flag will transfer ownership of all ports
5204          * from the companions to the EHCI controller.  If any of the
5205          * companions are in the middle of a port reset at the time, it
5206          * could cause trouble.  Write-locking ehci_cf_port_reset_rwsem
5207          * guarantees that no resets are in progress.  After we set CF,
5208          * a short delay lets the hardware catch up; new resets shouldn't
5209          * be started before the port switching actions could complete.
5210          */
5211         down_write(&ehci_cf_port_reset_rwsem);
5212         fusbh200->rh_state = FUSBH200_RH_RUNNING;
5213         fusbh200_readl(fusbh200, &fusbh200->regs->command);     /* unblock posted writes */
5214         msleep(5);
5215         up_write(&ehci_cf_port_reset_rwsem);
5216         fusbh200->last_periodic_enable = ktime_get_real();
5217 
5218         temp = HC_VERSION(fusbh200, fusbh200_readl(fusbh200, &fusbh200->caps->hc_capbase));
5219         fusbh200_info (fusbh200,
5220                 "USB %x.%x started, EHCI %x.%02x\n",
5221                 ((fusbh200->sbrn & 0xf0)>>4), (fusbh200->sbrn & 0x0f),
5222                 temp >> 8, temp & 0xff);
5223 
5224         fusbh200_writel(fusbh200, INTR_MASK,
5225                     &fusbh200->regs->intr_enable); /* Turn On Interrupts */
5226 
5227         /* GRR this is run-once init(), being done every time the HC starts.
5228          * So long as they're part of class devices, we can't do it init()
5229          * since the class device isn't created that early.
5230          */
5231         create_debug_files(fusbh200);
5232         create_sysfs_files(fusbh200);
5233 
5234         return 0;
5235 }
5236 
5237 static int fusbh200_setup(struct usb_hcd *hcd)
5238 {
5239         struct fusbh200_hcd *fusbh200 = hcd_to_fusbh200(hcd);
5240         int retval;
5241 
5242         fusbh200->regs = (void __iomem *)fusbh200->caps +
5243             HC_LENGTH(fusbh200, fusbh200_readl(fusbh200, &fusbh200->caps->hc_capbase));
5244         dbg_hcs_params(fusbh200, "reset");
5245         dbg_hcc_params(fusbh200, "reset");
5246 
5247         /* cache this readonly data; minimize chip reads */
5248         fusbh200->hcs_params = fusbh200_readl(fusbh200, &fusbh200->caps->hcs_params);
5249 
5250         fusbh200->sbrn = HCD_USB2;
5251 
5252         /* data structure init */
5253         retval = hcd_fusbh200_init(hcd);
5254         if (retval)
5255                 return retval;
5256 
5257         retval = fusbh200_halt(fusbh200);
5258         if (retval)
5259                 return retval;
5260 
5261         fusbh200_reset(fusbh200);
5262 
5263         return 0;
5264 }
5265 
5266 /*-------------------------------------------------------------------------*/
5267 
5268 static irqreturn_t fusbh200_irq (struct usb_hcd *hcd)
5269 {
5270         struct fusbh200_hcd             *fusbh200 = hcd_to_fusbh200 (hcd);
5271         u32                     status, masked_status, pcd_status = 0, cmd;
5272         int                     bh;
5273 
5274         spin_lock (&fusbh200->lock);
5275 
5276         status = fusbh200_readl(fusbh200, &fusbh200->regs->status);
5277 
5278         /* e.g. cardbus physical eject */
5279         if (status == ~(u32) 0) {
5280                 fusbh200_dbg (fusbh200, "device removed\n");
5281                 goto dead;
5282         }
5283 
5284         /*
5285          * We don't use STS_FLR, but some controllers don't like it to
5286          * remain on, so mask it out along with the other status bits.
5287          */
5288         masked_status = status & (INTR_MASK | STS_FLR);
5289 
5290         /* Shared IRQ? */
5291         if (!masked_status || unlikely(fusbh200->rh_state == FUSBH200_RH_HALTED)) {
5292                 spin_unlock(&fusbh200->lock);
5293                 return IRQ_NONE;
5294         }
5295 
5296         /* clear (just) interrupts */
5297         fusbh200_writel(fusbh200, masked_status, &fusbh200->regs->status);
5298         cmd = fusbh200_readl(fusbh200, &fusbh200->regs->command);
5299         bh = 0;
5300 
5301         /* normal [4.15.1.2] or error [4.15.1.1] completion */
5302         if (likely ((status & (STS_INT|STS_ERR)) != 0)) {
5303                 if (likely ((status & STS_ERR) == 0))
5304                         COUNT (fusbh200->stats.normal);
5305                 else
5306                         COUNT (fusbh200->stats.error);
5307                 bh = 1;
5308         }
5309 
5310         /* complete the unlinking of some qh [4.15.2.3] */
5311         if (status & STS_IAA) {
5312 
5313                 /* Turn off the IAA watchdog */
5314                 fusbh200->enabled_hrtimer_events &= ~BIT(FUSBH200_HRTIMER_IAA_WATCHDOG);
5315 
5316                 /*
5317                  * Mild optimization: Allow another IAAD to reset the
5318                  * hrtimer, if one occurs before the next expiration.
5319                  * In theory we could always cancel the hrtimer, but
5320                  * tests show that about half the time it will be reset
5321                  * for some other event anyway.
5322                  */
5323                 if (fusbh200->next_hrtimer_event == FUSBH200_HRTIMER_IAA_WATCHDOG)
5324                         ++fusbh200->next_hrtimer_event;
5325 
5326                 /* guard against (alleged) silicon errata */
5327                 if (cmd & CMD_IAAD)
5328                         fusbh200_dbg(fusbh200, "IAA with IAAD still set?\n");
5329                 if (fusbh200->async_iaa) {
5330                         COUNT(fusbh200->stats.iaa);
5331                         end_unlink_async(fusbh200);
5332                 } else
5333                         fusbh200_dbg(fusbh200, "IAA with nothing unlinked?\n");
5334         }
5335 
5336         /* remote wakeup [4.3.1] */
5337         if (status & STS_PCD) {
5338                 int pstatus;
5339                 u32 __iomem *status_reg = &fusbh200->regs->port_status;
5340 
5341                 /* kick root hub later */
5342                 pcd_status = status;
5343 
5344                 /* resume root hub? */
5345                 if (fusbh200->rh_state == FUSBH200_RH_SUSPENDED)
5346                         usb_hcd_resume_root_hub(hcd);
5347 
5348                 pstatus = fusbh200_readl(fusbh200, status_reg);
5349 
5350                 if (test_bit(0, &fusbh200->suspended_ports) &&
5351                                 ((pstatus & PORT_RESUME) ||
5352                                         !(pstatus & PORT_SUSPEND)) &&
5353                                 (pstatus & PORT_PE) &&
5354                                 fusbh200->reset_done[0] == 0) {
5355 
5356                         /* start 20 msec resume signaling from this port,
5357                          * and make hub_wq collect PORT_STAT_C_SUSPEND to
5358                          * stop that signaling.  Use 5 ms extra for safety,
5359                          * like usb_port_resume() does.
5360                          */
5361                         fusbh200->reset_done[0] = jiffies + msecs_to_jiffies(25);
5362                         set_bit(0, &fusbh200->resuming_ports);
5363                         fusbh200_dbg (fusbh200, "port 1 remote wakeup\n");
5364                         mod_timer(&hcd->rh_timer, fusbh200->reset_done[0]);
5365                 }
5366         }
5367 
5368         /* PCI errors [4.15.2.4] */
5369         if (unlikely ((status & STS_FATAL) != 0)) {
5370                 fusbh200_err(fusbh200, "fatal error\n");
5371                 dbg_cmd(fusbh200, "fatal", cmd);
5372                 dbg_status(fusbh200, "fatal", status);
5373 dead:
5374                 usb_hc_died(hcd);
5375 
5376                 /* Don't let the controller do anything more */
5377                 fusbh200->shutdown = true;
5378                 fusbh200->rh_state = FUSBH200_RH_STOPPING;
5379                 fusbh200->command &= ~(CMD_RUN | CMD_ASE | CMD_PSE);
5380                 fusbh200_writel(fusbh200, fusbh200->command, &fusbh200->regs->command);
5381                 fusbh200_writel(fusbh200, 0, &fusbh200->regs->intr_enable);
5382                 fusbh200_handle_controller_death(fusbh200);
5383 
5384                 /* Handle completions when the controller stops */
5385                 bh = 0;
5386         }
5387 
5388         if (bh)
5389                 fusbh200_work (fusbh200);
5390         spin_unlock (&fusbh200->lock);
5391         if (pcd_status)
5392                 usb_hcd_poll_rh_status(hcd);
5393         return IRQ_HANDLED;
5394 }
5395 
5396 /*-------------------------------------------------------------------------*/
5397 
5398 /*
5399  * non-error returns are a promise to giveback() the urb later
5400  * we drop ownership so next owner (or urb unlink) can get it
5401  *
5402  * urb + dev is in hcd.self.controller.urb_list
5403  * we're queueing TDs onto software and hardware lists
5404  *
5405  * hcd-specific init for hcpriv hasn't been done yet
5406  *
5407  * NOTE:  control, bulk, and interrupt share the same code to append TDs
5408  * to a (possibly active) QH, and the same QH scanning code.
5409  */
5410 static int fusbh200_urb_enqueue (
5411         struct usb_hcd  *hcd,
5412         struct urb      *urb,
5413         gfp_t           mem_flags
5414 ) {
5415         struct fusbh200_hcd             *fusbh200 = hcd_to_fusbh200 (hcd);
5416         struct list_head        qtd_list;
5417 
5418         INIT_LIST_HEAD (&qtd_list);
5419 
5420         switch (usb_pipetype (urb->pipe)) {
5421         case PIPE_CONTROL:
5422                 /* qh_completions() code doesn't handle all the fault cases
5423                  * in multi-TD control transfers.  Even 1KB is rare anyway.
5424                  */
5425                 if (urb->transfer_buffer_length > (16 * 1024))
5426                         return -EMSGSIZE;
5427                 /* FALLTHROUGH */
5428         /* case PIPE_BULK: */
5429         default:
5430                 if (!qh_urb_transaction (fusbh200, urb, &qtd_list, mem_flags))
5431                         return -ENOMEM;
5432                 return submit_async(fusbh200, urb, &qtd_list, mem_flags);
5433 
5434         case PIPE_INTERRUPT:
5435                 if (!qh_urb_transaction (fusbh200, urb, &qtd_list, mem_flags))
5436                         return -ENOMEM;
5437                 return intr_submit(fusbh200, urb, &qtd_list, mem_flags);
5438 
5439         case PIPE_ISOCHRONOUS:
5440                 return itd_submit (fusbh200, urb, mem_flags);
5441         }
5442 }
5443 
5444 /* remove from hardware lists
5445  * completions normally happen asynchronously
5446  */
5447 
5448 static int fusbh200_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
5449 {
5450         struct fusbh200_hcd             *fusbh200 = hcd_to_fusbh200 (hcd);
5451         struct fusbh200_qh              *qh;
5452         unsigned long           flags;
5453         int                     rc;
5454 
5455         spin_lock_irqsave (&fusbh200->lock, flags);
5456         rc = usb_hcd_check_unlink_urb(hcd, urb, status);
5457         if (rc)
5458                 goto done;
5459 
5460         switch (usb_pipetype (urb->pipe)) {
5461         // case PIPE_CONTROL:
5462         // case PIPE_BULK:
5463         default:
5464                 qh = (struct fusbh200_qh *) urb->hcpriv;
5465                 if (!qh)
5466                         break;
5467                 switch (qh->qh_state) {
5468                 case QH_STATE_LINKED:
5469                 case QH_STATE_COMPLETING:
5470                         start_unlink_async(fusbh200, qh);
5471                         break;
5472                 case QH_STATE_UNLINK:
5473                 case QH_STATE_UNLINK_WAIT:
5474                         /* already started */
5475                         break;
5476                 case QH_STATE_IDLE:
5477                         /* QH might be waiting for a Clear-TT-Buffer */
5478                         qh_completions(fusbh200, qh);
5479                         break;
5480                 }
5481                 break;
5482 
5483         case PIPE_INTERRUPT:
5484                 qh = (struct fusbh200_qh *) urb->hcpriv;
5485                 if (!qh)
5486                         break;
5487                 switch (qh->qh_state) {
5488                 case QH_STATE_LINKED:
5489                 case QH_STATE_COMPLETING:
5490                         start_unlink_intr(fusbh200, qh);
5491                         break;
5492                 case QH_STATE_IDLE:
5493                         qh_completions (fusbh200, qh);
5494                         break;
5495                 default:
5496                         fusbh200_dbg (fusbh200, "bogus qh %p state %d\n",
5497                                         qh, qh->qh_state);
5498                         goto done;
5499                 }
5500                 break;
5501 
5502         case PIPE_ISOCHRONOUS:
5503                 // itd...
5504 
5505                 // wait till next completion, do it then.
5506                 // completion irqs can wait up to 1024 msec,
5507                 break;
5508         }
5509 done:
5510         spin_unlock_irqrestore (&fusbh200->lock, flags);
5511         return rc;
5512 }
5513 
5514 /*-------------------------------------------------------------------------*/
5515 
5516 // bulk qh holds the data toggle
5517 
5518 static void
5519 fusbh200_endpoint_disable (struct usb_hcd *hcd, struct usb_host_endpoint *ep)
5520 {
5521         struct fusbh200_hcd             *fusbh200 = hcd_to_fusbh200 (hcd);
5522         unsigned long           flags;
5523         struct fusbh200_qh              *qh, *tmp;
5524 
5525         /* ASSERT:  any requests/urbs are being unlinked */
5526         /* ASSERT:  nobody can be submitting urbs for this any more */
5527 
5528 rescan:
5529         spin_lock_irqsave (&fusbh200->lock, flags);
5530         qh = ep->hcpriv;
5531         if (!qh)
5532                 goto done;
5533 
5534         /* endpoints can be iso streams.  for now, we don't
5535          * accelerate iso completions ... so spin a while.
5536          */
5537         if (qh->hw == NULL) {
5538                 struct fusbh200_iso_stream      *stream = ep->hcpriv;
5539 
5540                 if (!list_empty(&stream->td_list))
5541                         goto idle_timeout;
5542 
5543                 /* BUG_ON(!list_empty(&stream->free_list)); */
5544                 kfree(stream);
5545                 goto done;
5546         }
5547 
5548         if (fusbh200->rh_state < FUSBH200_RH_RUNNING)
5549                 qh->qh_state = QH_STATE_IDLE;
5550         switch (qh->qh_state) {
5551         case QH_STATE_LINKED:
5552         case QH_STATE_COMPLETING:
5553                 for (tmp = fusbh200->async->qh_next.qh;
5554                                 tmp && tmp != qh;
5555                                 tmp = tmp->qh_next.qh)
5556                         continue;
5557                 /* periodic qh self-unlinks on empty, and a COMPLETING qh
5558                  * may already be unlinked.
5559                  */
5560                 if (tmp)
5561                         start_unlink_async(fusbh200, qh);
5562                 /* FALL THROUGH */
5563         case QH_STATE_UNLINK:           /* wait for hw to finish? */
5564         case QH_STATE_UNLINK_WAIT:
5565 idle_timeout:
5566                 spin_unlock_irqrestore (&fusbh200->lock, flags);
5567                 schedule_timeout_uninterruptible(1);
5568                 goto rescan;
5569         case QH_STATE_IDLE:             /* fully unlinked */
5570                 if (qh->clearing_tt)
5571                         goto idle_timeout;
5572                 if (list_empty (&qh->qtd_list)) {
5573                         qh_destroy(fusbh200, qh);
5574                         break;
5575                 }
5576                 /* else FALL THROUGH */
5577         default:
5578                 /* caller was supposed to have unlinked any requests;
5579                  * that's not our job.  just leak this memory.
5580                  */
5581                 fusbh200_err (fusbh200, "qh %p (#%02x) state %d%s\n",
5582                         qh, ep->desc.bEndpointAddress, qh->qh_state,
5583                         list_empty (&qh->qtd_list) ? "" : "(has tds)");
5584                 break;
5585         }
5586  done:
5587         ep->hcpriv = NULL;
5588         spin_unlock_irqrestore (&fusbh200->lock, flags);
5589 }
5590 
5591 static void
5592 fusbh200_endpoint_reset(struct usb_hcd *hcd, struct usb_host_endpoint *ep)
5593 {
5594         struct fusbh200_hcd             *fusbh200 = hcd_to_fusbh200(hcd);
5595         struct fusbh200_qh              *qh;
5596         int                     eptype = usb_endpoint_type(&ep->desc);
5597         int                     epnum = usb_endpoint_num(&ep->desc);
5598         int                     is_out = usb_endpoint_dir_out(&ep->desc);
5599         unsigned long           flags;
5600 
5601         if (eptype != USB_ENDPOINT_XFER_BULK && eptype != USB_ENDPOINT_XFER_INT)
5602                 return;
5603 
5604         spin_lock_irqsave(&fusbh200->lock, flags);
5605         qh = ep->hcpriv;
5606 
5607         /* For Bulk and Interrupt endpoints we maintain the toggle state
5608          * in the hardware; the toggle bits in udev aren't used at all.
5609          * When an endpoint is reset by usb_clear_halt() we must reset
5610          * the toggle bit in the QH.
5611          */
5612         if (qh) {
5613                 usb_settoggle(qh->dev, epnum, is_out, 0);
5614                 if (!list_empty(&qh->qtd_list)) {
5615                         WARN_ONCE(1, "clear_halt for a busy endpoint\n");
5616                 } else if (qh->qh_state == QH_STATE_LINKED ||
5617                                 qh->qh_state == QH_STATE_COMPLETING) {
5618 
5619                         /* The toggle value in the QH can't be updated
5620                          * while the QH is active.  Unlink it now;
5621                          * re-linking will call qh_refresh().
5622                          */
5623                         if (eptype == USB_ENDPOINT_XFER_BULK)
5624                                 start_unlink_async(fusbh200, qh);
5625                         else
5626                                 start_unlink_intr(fusbh200, qh);
5627                 }
5628         }
5629         spin_unlock_irqrestore(&fusbh200->lock, flags);
5630 }
5631 
5632 static int fusbh200_get_frame (struct usb_hcd *hcd)
5633 {
5634         struct fusbh200_hcd             *fusbh200 = hcd_to_fusbh200 (hcd);
5635         return (fusbh200_read_frame_index(fusbh200) >> 3) % fusbh200->periodic_size;
5636 }
5637 
5638 /*-------------------------------------------------------------------------*/
5639 
5640 /*
5641  * The EHCI in ChipIdea HDRC cannot be a separate module or device,
5642  * because its registers (and irq) are shared between host/gadget/otg
5643  * functions  and in order to facilitate role switching we cannot
5644  * give the fusbh200 driver exclusive access to those.
5645  */
5646 MODULE_DESCRIPTION(DRIVER_DESC);
5647 MODULE_AUTHOR (DRIVER_AUTHOR);
5648 MODULE_LICENSE ("GPL");
5649 
5650 static const struct hc_driver fusbh200_fusbh200_hc_driver = {
5651         .description            = hcd_name,
5652         .product_desc           = "Faraday USB2.0 Host Controller",
5653         .hcd_priv_size          = sizeof(struct fusbh200_hcd),
5654 
5655         /*
5656          * generic hardware linkage
5657          */
5658         .irq                    = fusbh200_irq,
5659         .flags                  = HCD_MEMORY | HCD_USB2,
5660 
5661         /*
5662          * basic lifecycle operations
5663          */
5664         .reset                  = hcd_fusbh200_init,
5665         .start                  = fusbh200_run,
5666         .stop                   = fusbh200_stop,
5667         .shutdown               = fusbh200_shutdown,
5668 
5669         /*
5670          * managing i/o requests and associated device resources
5671          */
5672         .urb_enqueue            = fusbh200_urb_enqueue,
5673         .urb_dequeue            = fusbh200_urb_dequeue,
5674         .endpoint_disable       = fusbh200_endpoint_disable,
5675         .endpoint_reset         = fusbh200_endpoint_reset,
5676 
5677         /*
5678          * scheduling support
5679          */
5680         .get_frame_number       = fusbh200_get_frame,
5681 
5682         /*
5683          * root hub support
5684          */
5685         .hub_status_data        = fusbh200_hub_status_data,
5686         .hub_control            = fusbh200_hub_control,
5687         .bus_suspend            = fusbh200_bus_suspend,
5688         .bus_resume             = fusbh200_bus_resume,
5689 
5690         .relinquish_port        = fusbh200_relinquish_port,
5691         .port_handed_over       = fusbh200_port_handed_over,
5692 
5693         .clear_tt_buffer_complete = fusbh200_clear_tt_buffer_complete,
5694 };
5695 
5696 static void fusbh200_init(struct fusbh200_hcd *fusbh200)
5697 {
5698         u32 reg;
5699 
5700         reg = fusbh200_readl(fusbh200, &fusbh200->regs->bmcsr);
5701         reg |= BMCSR_INT_POLARITY;
5702         reg &= ~BMCSR_VBUS_OFF;
5703         fusbh200_writel(fusbh200, reg, &fusbh200->regs->bmcsr);
5704 
5705         reg = fusbh200_readl(fusbh200, &fusbh200->regs->bmier);
5706         fusbh200_writel(fusbh200, reg | BMIER_OVC_EN | BMIER_VBUS_ERR_EN,
5707                 &fusbh200->regs->bmier);
5708 }
5709 
5710 /**
5711  * fusbh200_hcd_probe - initialize faraday FUSBH200 HCDs
5712  *
5713  * Allocates basic resources for this USB host controller, and
5714  * then invokes the start() method for the HCD associated with it
5715  * through the hotplug entry's driver_data.
5716  */
5717 static int fusbh200_hcd_probe(struct platform_device *pdev)
5718 {
5719         struct device                   *dev = &pdev->dev;
5720         struct usb_hcd                  *hcd;
5721         struct resource                 *res;
5722         int                             irq;
5723         int                             retval = -ENODEV;
5724         struct fusbh200_hcd             *fusbh200;
5725 
5726         if (usb_disabled())
5727                 return -ENODEV;
5728 
5729         pdev->dev.power.power_state = PMSG_ON;
5730 
5731         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
5732         if (!res) {
5733                 dev_err(dev,
5734                         "Found HC with no IRQ. Check %s setup!\n",
5735                         dev_name(dev));
5736                 return -ENODEV;
5737         }
5738 
5739         irq = res->start;
5740 
5741         hcd = usb_create_hcd(&fusbh200_fusbh200_hc_driver, dev,
5742                         dev_name(dev));
5743         if (!hcd) {
5744                 dev_err(dev, "failed to create hcd with err %d\n", retval);
5745                 retval = -ENOMEM;
5746                 goto fail_create_hcd;
5747         }
5748 
5749         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
5750         if (!res) {
5751                 dev_err(dev,
5752                         "Found HC with no register addr. Check %s setup!\n",
5753                         dev_name(dev));
5754                 retval = -ENODEV;
5755                 goto fail_request_resource;
5756         }
5757 
5758         hcd->rsrc_start = res->start;
5759         hcd->rsrc_len = resource_size(res);
5760         hcd->has_tt = 1;
5761 
5762         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
5763                                 fusbh200_fusbh200_hc_driver.description)) {
5764                 dev_dbg(dev, "controller already in use\n");
5765                 retval = -EBUSY;
5766                 goto fail_request_resource;
5767         }
5768 
5769         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
5770         if (!res) {
5771                 dev_err(dev,
5772                         "Found HC with no register addr. Check %s setup!\n",
5773                         dev_name(dev));
5774                 retval = -ENODEV;
5775                 goto fail_request_resource;
5776         }
5777 
5778         hcd->regs = ioremap_nocache(res->start, resource_size(res));
5779         if (hcd->regs == NULL) {
5780                 dev_dbg(dev, "error mapping memory\n");
5781                 retval = -EFAULT;
5782                 goto fail_ioremap;
5783         }
5784 
5785         fusbh200 = hcd_to_fusbh200(hcd);
5786 
5787         fusbh200->caps = hcd->regs;
5788 
5789         retval = fusbh200_setup(hcd);
5790         if (retval)
5791                 goto fail_add_hcd;
5792 
5793         fusbh200_init(fusbh200);
5794 
5795         retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
5796         if (retval) {
5797                 dev_err(dev, "failed to add hcd with err %d\n", retval);
5798                 goto fail_add_hcd;
5799         }
5800         device_wakeup_enable(hcd->self.controller);
5801 
5802         return retval;
5803 
5804 fail_add_hcd:
5805         iounmap(hcd->regs);
5806 fail_ioremap:
5807         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
5808 fail_request_resource:
5809         usb_put_hcd(hcd);
5810 fail_create_hcd:
5811         dev_err(dev, "init %s fail, %d\n", dev_name(dev), retval);
5812         return retval;
5813 }
5814 
5815 /**
5816  * fusbh200_hcd_remove - shutdown processing for EHCI HCDs
5817  * @dev: USB Host Controller being removed
5818  *
5819  * Reverses the effect of fotg2xx_usb_hcd_probe(), first invoking
5820  * the HCD's stop() method.  It is always called from a thread
5821  * context, normally "rmmod", "apmd", or something similar.
5822  */
5823 static int fusbh200_hcd_remove(struct platform_device *pdev)
5824 {
5825         struct device *dev      = &pdev->dev;
5826         struct usb_hcd *hcd     = dev_get_drvdata(dev);
5827 
5828         if (!hcd)
5829                 return 0;
5830 
5831         usb_remove_hcd(hcd);
5832         iounmap(hcd->regs);
5833         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
5834         usb_put_hcd(hcd);
5835 
5836         return 0;
5837 }
5838 
5839 static struct platform_driver fusbh200_hcd_fusbh200_driver = {
5840         .driver = {
5841                 .name   = "fusbh200",
5842         },
5843         .probe  = fusbh200_hcd_probe,
5844         .remove = fusbh200_hcd_remove,
5845 };
5846 
5847 static int __init fusbh200_hcd_init(void)
5848 {
5849         int retval = 0;
5850 
5851         if (usb_disabled())
5852                 return -ENODEV;
5853 
5854         printk(KERN_INFO "%s: " DRIVER_DESC "\n", hcd_name);
5855         set_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
5856         if (test_bit(USB_UHCI_LOADED, &usb_hcds_loaded) ||
5857                         test_bit(USB_OHCI_LOADED, &usb_hcds_loaded))
5858                 printk(KERN_WARNING "Warning! fusbh200_hcd should always be loaded"
5859                                 " before uhci_hcd and ohci_hcd, not after\n");
5860 
5861         pr_debug("%s: block sizes: qh %Zd qtd %Zd itd %Zd\n",
5862                  hcd_name,
5863                  sizeof(struct fusbh200_qh), sizeof(struct fusbh200_qtd),
5864                  sizeof(struct fusbh200_itd));
5865 
5866         fusbh200_debug_root = debugfs_create_dir("fusbh200", usb_debug_root);
5867         if (!fusbh200_debug_root) {
5868                 retval = -ENOENT;
5869                 goto err_debug;
5870         }
5871 
5872         retval = platform_driver_register(&fusbh200_hcd_fusbh200_driver);
5873         if (retval < 0)
5874                 goto clean;
5875         return retval;
5876 
5877         platform_driver_unregister(&fusbh200_hcd_fusbh200_driver);
5878 clean:
5879         debugfs_remove(fusbh200_debug_root);
5880         fusbh200_debug_root = NULL;
5881 err_debug:
5882         clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
5883         return retval;
5884 }
5885 module_init(fusbh200_hcd_init);
5886 
5887 static void __exit fusbh200_hcd_cleanup(void)
5888 {
5889         platform_driver_unregister(&fusbh200_hcd_fusbh200_driver);
5890         debugfs_remove(fusbh200_debug_root);
5891         clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
5892 }
5893 module_exit(fusbh200_hcd_cleanup);
5894 

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