Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18

Linux/drivers/usb/host/oxu210hp-hcd.c

  1 /*
  2  * Copyright (c) 2008 Rodolfo Giometti <giometti@linux.it>
  3  * Copyright (c) 2008 Eurotech S.p.A. <info@eurtech.it>
  4  *
  5  * This code is *strongly* based on EHCI-HCD code by David Brownell since
  6  * the chip is a quasi-EHCI compatible.
  7  *
  8  * This program is free software; you can redistribute it and/or modify it
  9  * under the terms of the GNU General Public License as published by the
 10  * Free Software Foundation; either version 2 of the License, or (at your
 11  * option) any later version.
 12  *
 13  * This program is distributed in the hope that it will be useful, but
 14  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 15  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 16  * for more details.
 17  *
 18  * You should have received a copy of the GNU General Public License
 19  * along with this program; if not, write to the Free Software Foundation,
 20  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 21  */
 22 
 23 #include <linux/module.h>
 24 #include <linux/pci.h>
 25 #include <linux/dmapool.h>
 26 #include <linux/kernel.h>
 27 #include <linux/delay.h>
 28 #include <linux/ioport.h>
 29 #include <linux/sched.h>
 30 #include <linux/slab.h>
 31 #include <linux/errno.h>
 32 #include <linux/timer.h>
 33 #include <linux/list.h>
 34 #include <linux/interrupt.h>
 35 #include <linux/usb.h>
 36 #include <linux/usb/hcd.h>
 37 #include <linux/moduleparam.h>
 38 #include <linux/dma-mapping.h>
 39 #include <linux/io.h>
 40 
 41 #include <asm/irq.h>
 42 #include <asm/unaligned.h>
 43 
 44 #include <linux/irq.h>
 45 #include <linux/platform_device.h>
 46 
 47 #include "oxu210hp.h"
 48 
 49 #define DRIVER_VERSION "0.0.50"
 50 
 51 /*
 52  * Main defines
 53  */
 54 
 55 #define oxu_dbg(oxu, fmt, args...) \
 56                 dev_dbg(oxu_to_hcd(oxu)->self.controller , fmt , ## args)
 57 #define oxu_err(oxu, fmt, args...) \
 58                 dev_err(oxu_to_hcd(oxu)->self.controller , fmt , ## args)
 59 #define oxu_info(oxu, fmt, args...) \
 60                 dev_info(oxu_to_hcd(oxu)->self.controller , fmt , ## args)
 61 
 62 #ifdef CONFIG_DYNAMIC_DEBUG
 63 #define DEBUG
 64 #endif
 65 
 66 static inline struct usb_hcd *oxu_to_hcd(struct oxu_hcd *oxu)
 67 {
 68         return container_of((void *) oxu, struct usb_hcd, hcd_priv);
 69 }
 70 
 71 static inline struct oxu_hcd *hcd_to_oxu(struct usb_hcd *hcd)
 72 {
 73         return (struct oxu_hcd *) (hcd->hcd_priv);
 74 }
 75 
 76 /*
 77  * Debug stuff
 78  */
 79 
 80 #undef OXU_URB_TRACE
 81 #undef OXU_VERBOSE_DEBUG
 82 
 83 #ifdef OXU_VERBOSE_DEBUG
 84 #define oxu_vdbg                        oxu_dbg
 85 #else
 86 #define oxu_vdbg(oxu, fmt, args...)     /* Nop */
 87 #endif
 88 
 89 #ifdef DEBUG
 90 
 91 static int __attribute__((__unused__))
 92 dbg_status_buf(char *buf, unsigned len, const char *label, u32 status)
 93 {
 94         return scnprintf(buf, len, "%s%sstatus %04x%s%s%s%s%s%s%s%s%s%s",
 95                 label, label[0] ? " " : "", status,
 96                 (status & STS_ASS) ? " Async" : "",
 97                 (status & STS_PSS) ? " Periodic" : "",
 98                 (status & STS_RECL) ? " Recl" : "",
 99                 (status & STS_HALT) ? " Halt" : "",
100                 (status & STS_IAA) ? " IAA" : "",
101                 (status & STS_FATAL) ? " FATAL" : "",
102                 (status & STS_FLR) ? " FLR" : "",
103                 (status & STS_PCD) ? " PCD" : "",
104                 (status & STS_ERR) ? " ERR" : "",
105                 (status & STS_INT) ? " INT" : ""
106                 );
107 }
108 
109 static int __attribute__((__unused__))
110 dbg_intr_buf(char *buf, unsigned len, const char *label, u32 enable)
111 {
112         return scnprintf(buf, len, "%s%sintrenable %02x%s%s%s%s%s%s",
113                 label, label[0] ? " " : "", enable,
114                 (enable & STS_IAA) ? " IAA" : "",
115                 (enable & STS_FATAL) ? " FATAL" : "",
116                 (enable & STS_FLR) ? " FLR" : "",
117                 (enable & STS_PCD) ? " PCD" : "",
118                 (enable & STS_ERR) ? " ERR" : "",
119                 (enable & STS_INT) ? " INT" : ""
120                 );
121 }
122 
123 static const char *const fls_strings[] =
124     { "1024", "512", "256", "??" };
125 
126 static int dbg_command_buf(char *buf, unsigned len,
127                                 const char *label, u32 command)
128 {
129         return scnprintf(buf, len,
130                 "%s%scommand %06x %s=%d ithresh=%d%s%s%s%s period=%s%s %s",
131                 label, label[0] ? " " : "", command,
132                 (command & CMD_PARK) ? "park" : "(park)",
133                 CMD_PARK_CNT(command),
134                 (command >> 16) & 0x3f,
135                 (command & CMD_LRESET) ? " LReset" : "",
136                 (command & CMD_IAAD) ? " IAAD" : "",
137                 (command & CMD_ASE) ? " Async" : "",
138                 (command & CMD_PSE) ? " Periodic" : "",
139                 fls_strings[(command >> 2) & 0x3],
140                 (command & CMD_RESET) ? " Reset" : "",
141                 (command & CMD_RUN) ? "RUN" : "HALT"
142                 );
143 }
144 
145 static int dbg_port_buf(char *buf, unsigned len, const char *label,
146                                 int port, u32 status)
147 {
148         char    *sig;
149 
150         /* signaling state */
151         switch (status & (3 << 10)) {
152         case 0 << 10:
153                 sig = "se0";
154                 break;
155         case 1 << 10:
156                 sig = "k";      /* low speed */
157                 break;
158         case 2 << 10:
159                 sig = "j";
160                 break;
161         default:
162                 sig = "?";
163                 break;
164         }
165 
166         return scnprintf(buf, len,
167                 "%s%sport %d status %06x%s%s sig=%s%s%s%s%s%s%s%s%s%s",
168                 label, label[0] ? " " : "", port, status,
169                 (status & PORT_POWER) ? " POWER" : "",
170                 (status & PORT_OWNER) ? " OWNER" : "",
171                 sig,
172                 (status & PORT_RESET) ? " RESET" : "",
173                 (status & PORT_SUSPEND) ? " SUSPEND" : "",
174                 (status & PORT_RESUME) ? " RESUME" : "",
175                 (status & PORT_OCC) ? " OCC" : "",
176                 (status & PORT_OC) ? " OC" : "",
177                 (status & PORT_PEC) ? " PEC" : "",
178                 (status & PORT_PE) ? " PE" : "",
179                 (status & PORT_CSC) ? " CSC" : "",
180                 (status & PORT_CONNECT) ? " CONNECT" : ""
181             );
182 }
183 
184 #else
185 
186 static inline int __attribute__((__unused__))
187 dbg_status_buf(char *buf, unsigned len, const char *label, u32 status)
188 { return 0; }
189 
190 static inline int __attribute__((__unused__))
191 dbg_command_buf(char *buf, unsigned len, const char *label, u32 command)
192 { return 0; }
193 
194 static inline int __attribute__((__unused__))
195 dbg_intr_buf(char *buf, unsigned len, const char *label, u32 enable)
196 { return 0; }
197 
198 static inline int __attribute__((__unused__))
199 dbg_port_buf(char *buf, unsigned len, const char *label, int port, u32 status)
200 { return 0; }
201 
202 #endif /* DEBUG */
203 
204 /* functions have the "wrong" filename when they're output... */
205 #define dbg_status(oxu, label, status) { \
206         char _buf[80]; \
207         dbg_status_buf(_buf, sizeof _buf, label, status); \
208         oxu_dbg(oxu, "%s\n", _buf); \
209 }
210 
211 #define dbg_cmd(oxu, label, command) { \
212         char _buf[80]; \
213         dbg_command_buf(_buf, sizeof _buf, label, command); \
214         oxu_dbg(oxu, "%s\n", _buf); \
215 }
216 
217 #define dbg_port(oxu, label, port, status) { \
218         char _buf[80]; \
219         dbg_port_buf(_buf, sizeof _buf, label, port, status); \
220         oxu_dbg(oxu, "%s\n", _buf); \
221 }
222 
223 /*
224  * Module parameters
225  */
226 
227 /* Initial IRQ latency: faster than hw default */
228 static int log2_irq_thresh;                     /* 0 to 6 */
229 module_param(log2_irq_thresh, int, S_IRUGO);
230 MODULE_PARM_DESC(log2_irq_thresh, "log2 IRQ latency, 1-64 microframes");
231 
232 /* Initial park setting: slower than hw default */
233 static unsigned park;
234 module_param(park, uint, S_IRUGO);
235 MODULE_PARM_DESC(park, "park setting; 1-3 back-to-back async packets");
236 
237 /* For flakey hardware, ignore overcurrent indicators */
238 static bool ignore_oc;
239 module_param(ignore_oc, bool, S_IRUGO);
240 MODULE_PARM_DESC(ignore_oc, "ignore bogus hardware overcurrent indications");
241 
242 
243 static void ehci_work(struct oxu_hcd *oxu);
244 static int oxu_hub_control(struct usb_hcd *hcd,
245                                 u16 typeReq, u16 wValue, u16 wIndex,
246                                 char *buf, u16 wLength);
247 
248 /*
249  * Local functions
250  */
251 
252 /* Low level read/write registers functions */
253 static inline u32 oxu_readl(void *base, u32 reg)
254 {
255         return readl(base + reg);
256 }
257 
258 static inline void oxu_writel(void *base, u32 reg, u32 val)
259 {
260         writel(val, base + reg);
261 }
262 
263 static inline void timer_action_done(struct oxu_hcd *oxu,
264                                         enum ehci_timer_action action)
265 {
266         clear_bit(action, &oxu->actions);
267 }
268 
269 static inline void timer_action(struct oxu_hcd *oxu,
270                                         enum ehci_timer_action action)
271 {
272         if (!test_and_set_bit(action, &oxu->actions)) {
273                 unsigned long t;
274 
275                 switch (action) {
276                 case TIMER_IAA_WATCHDOG:
277                         t = EHCI_IAA_JIFFIES;
278                         break;
279                 case TIMER_IO_WATCHDOG:
280                         t = EHCI_IO_JIFFIES;
281                         break;
282                 case TIMER_ASYNC_OFF:
283                         t = EHCI_ASYNC_JIFFIES;
284                         break;
285                 case TIMER_ASYNC_SHRINK:
286                 default:
287                         t = EHCI_SHRINK_JIFFIES;
288                         break;
289                 }
290                 t += jiffies;
291                 /* all timings except IAA watchdog can be overridden.
292                  * async queue SHRINK often precedes IAA.  while it's ready
293                  * to go OFF neither can matter, and afterwards the IO
294                  * watchdog stops unless there's still periodic traffic.
295                  */
296                 if (action != TIMER_IAA_WATCHDOG
297                                 && t > oxu->watchdog.expires
298                                 && timer_pending(&oxu->watchdog))
299                         return;
300                 mod_timer(&oxu->watchdog, t);
301         }
302 }
303 
304 /*
305  * handshake - spin reading hc until handshake completes or fails
306  * @ptr: address of hc register to be read
307  * @mask: bits to look at in result of read
308  * @done: value of those bits when handshake succeeds
309  * @usec: timeout in microseconds
310  *
311  * Returns negative errno, or zero on success
312  *
313  * Success happens when the "mask" bits have the specified value (hardware
314  * handshake done).  There are two failure modes:  "usec" have passed (major
315  * hardware flakeout), or the register reads as all-ones (hardware removed).
316  *
317  * That last failure should_only happen in cases like physical cardbus eject
318  * before driver shutdown. But it also seems to be caused by bugs in cardbus
319  * bridge shutdown:  shutting down the bridge before the devices using it.
320  */
321 static int handshake(struct oxu_hcd *oxu, void __iomem *ptr,
322                                         u32 mask, u32 done, int usec)
323 {
324         u32 result;
325 
326         do {
327                 result = readl(ptr);
328                 if (result == ~(u32)0)          /* card removed */
329                         return -ENODEV;
330                 result &= mask;
331                 if (result == done)
332                         return 0;
333                 udelay(1);
334                 usec--;
335         } while (usec > 0);
336         return -ETIMEDOUT;
337 }
338 
339 /* Force HC to halt state from unknown (EHCI spec section 2.3) */
340 static int ehci_halt(struct oxu_hcd *oxu)
341 {
342         u32     temp = readl(&oxu->regs->status);
343 
344         /* disable any irqs left enabled by previous code */
345         writel(0, &oxu->regs->intr_enable);
346 
347         if ((temp & STS_HALT) != 0)
348                 return 0;
349 
350         temp = readl(&oxu->regs->command);
351         temp &= ~CMD_RUN;
352         writel(temp, &oxu->regs->command);
353         return handshake(oxu, &oxu->regs->status,
354                           STS_HALT, STS_HALT, 16 * 125);
355 }
356 
357 /* Put TDI/ARC silicon into EHCI mode */
358 static void tdi_reset(struct oxu_hcd *oxu)
359 {
360         u32 __iomem *reg_ptr;
361         u32 tmp;
362 
363         reg_ptr = (u32 __iomem *)(((u8 __iomem *)oxu->regs) + 0x68);
364         tmp = readl(reg_ptr);
365         tmp |= 0x3;
366         writel(tmp, reg_ptr);
367 }
368 
369 /* Reset a non-running (STS_HALT == 1) controller */
370 static int ehci_reset(struct oxu_hcd *oxu)
371 {
372         int     retval;
373         u32     command = readl(&oxu->regs->command);
374 
375         command |= CMD_RESET;
376         dbg_cmd(oxu, "reset", command);
377         writel(command, &oxu->regs->command);
378         oxu_to_hcd(oxu)->state = HC_STATE_HALT;
379         oxu->next_statechange = jiffies;
380         retval = handshake(oxu, &oxu->regs->command,
381                             CMD_RESET, 0, 250 * 1000);
382 
383         if (retval)
384                 return retval;
385 
386         tdi_reset(oxu);
387 
388         return retval;
389 }
390 
391 /* Idle the controller (from running) */
392 static void ehci_quiesce(struct oxu_hcd *oxu)
393 {
394         u32     temp;
395 
396 #ifdef DEBUG
397         if (!HC_IS_RUNNING(oxu_to_hcd(oxu)->state))
398                 BUG();
399 #endif
400 
401         /* wait for any schedule enables/disables to take effect */
402         temp = readl(&oxu->regs->command) << 10;
403         temp &= STS_ASS | STS_PSS;
404         if (handshake(oxu, &oxu->regs->status, STS_ASS | STS_PSS,
405                                 temp, 16 * 125) != 0) {
406                 oxu_to_hcd(oxu)->state = HC_STATE_HALT;
407                 return;
408         }
409 
410         /* then disable anything that's still active */
411         temp = readl(&oxu->regs->command);
412         temp &= ~(CMD_ASE | CMD_IAAD | CMD_PSE);
413         writel(temp, &oxu->regs->command);
414 
415         /* hardware can take 16 microframes to turn off ... */
416         if (handshake(oxu, &oxu->regs->status, STS_ASS | STS_PSS,
417                                 0, 16 * 125) != 0) {
418                 oxu_to_hcd(oxu)->state = HC_STATE_HALT;
419                 return;
420         }
421 }
422 
423 static int check_reset_complete(struct oxu_hcd *oxu, int index,
424                                 u32 __iomem *status_reg, int port_status)
425 {
426         if (!(port_status & PORT_CONNECT)) {
427                 oxu->reset_done[index] = 0;
428                 return port_status;
429         }
430 
431         /* if reset finished and it's still not enabled -- handoff */
432         if (!(port_status & PORT_PE)) {
433                 oxu_dbg(oxu, "Failed to enable port %d on root hub TT\n",
434                                 index+1);
435                 return port_status;
436         } else
437                 oxu_dbg(oxu, "port %d high speed\n", index + 1);
438 
439         return port_status;
440 }
441 
442 static void ehci_hub_descriptor(struct oxu_hcd *oxu,
443                                 struct usb_hub_descriptor *desc)
444 {
445         int ports = HCS_N_PORTS(oxu->hcs_params);
446         u16 temp;
447 
448         desc->bDescriptorType = 0x29;
449         desc->bPwrOn2PwrGood = 10;      /* oxu 1.0, 2.3.9 says 20ms max */
450         desc->bHubContrCurrent = 0;
451 
452         desc->bNbrPorts = ports;
453         temp = 1 + (ports / 8);
454         desc->bDescLength = 7 + 2 * temp;
455 
456         /* ports removable, and usb 1.0 legacy PortPwrCtrlMask */
457         memset(&desc->u.hs.DeviceRemovable[0], 0, temp);
458         memset(&desc->u.hs.DeviceRemovable[temp], 0xff, temp);
459 
460         temp = 0x0008;                  /* per-port overcurrent reporting */
461         if (HCS_PPC(oxu->hcs_params))
462                 temp |= 0x0001;         /* per-port power control */
463         else
464                 temp |= 0x0002;         /* no power switching */
465         desc->wHubCharacteristics = (__force __u16)cpu_to_le16(temp);
466 }
467 
468 
469 /* Allocate an OXU210HP on-chip memory data buffer
470  *
471  * An on-chip memory data buffer is required for each OXU210HP USB transfer.
472  * Each transfer descriptor has one or more on-chip memory data buffers.
473  *
474  * Data buffers are allocated from a fix sized pool of data blocks.
475  * To minimise fragmentation and give reasonable memory utlisation,
476  * data buffers are allocated with sizes the power of 2 multiples of
477  * the block size, starting on an address a multiple of the allocated size.
478  *
479  * FIXME: callers of this function require a buffer to be allocated for
480  * len=0. This is a waste of on-chip memory and should be fix. Then this
481  * function should be changed to not allocate a buffer for len=0.
482  */
483 static int oxu_buf_alloc(struct oxu_hcd *oxu, struct ehci_qtd *qtd, int len)
484 {
485         int n_blocks;   /* minium blocks needed to hold len */
486         int a_blocks;   /* blocks allocated */
487         int i, j;
488 
489         /* Don't allocte bigger than supported */
490         if (len > BUFFER_SIZE * BUFFER_NUM) {
491                 oxu_err(oxu, "buffer too big (%d)\n", len);
492                 return -ENOMEM;
493         }
494 
495         spin_lock(&oxu->mem_lock);
496 
497         /* Number of blocks needed to hold len */
498         n_blocks = (len + BUFFER_SIZE - 1) / BUFFER_SIZE;
499 
500         /* Round the number of blocks up to the power of 2 */
501         for (a_blocks = 1; a_blocks < n_blocks; a_blocks <<= 1)
502                 ;
503 
504         /* Find a suitable available data buffer */
505         for (i = 0; i < BUFFER_NUM;
506                         i += max(a_blocks, (int)oxu->db_used[i])) {
507 
508                 /* Check all the required blocks are available */
509                 for (j = 0; j < a_blocks; j++)
510                         if (oxu->db_used[i + j])
511                                 break;
512 
513                 if (j != a_blocks)
514                         continue;
515 
516                 /* Allocate blocks found! */
517                 qtd->buffer = (void *) &oxu->mem->db_pool[i];
518                 qtd->buffer_dma = virt_to_phys(qtd->buffer);
519 
520                 qtd->qtd_buffer_len = BUFFER_SIZE * a_blocks;
521                 oxu->db_used[i] = a_blocks;
522 
523                 spin_unlock(&oxu->mem_lock);
524 
525                 return 0;
526         }
527 
528         /* Failed */
529 
530         spin_unlock(&oxu->mem_lock);
531 
532         return -ENOMEM;
533 }
534 
535 static void oxu_buf_free(struct oxu_hcd *oxu, struct ehci_qtd *qtd)
536 {
537         int index;
538 
539         spin_lock(&oxu->mem_lock);
540 
541         index = (qtd->buffer - (void *) &oxu->mem->db_pool[0])
542                                                          / BUFFER_SIZE;
543         oxu->db_used[index] = 0;
544         qtd->qtd_buffer_len = 0;
545         qtd->buffer_dma = 0;
546         qtd->buffer = NULL;
547 
548         spin_unlock(&oxu->mem_lock);
549 }
550 
551 static inline void ehci_qtd_init(struct ehci_qtd *qtd, dma_addr_t dma)
552 {
553         memset(qtd, 0, sizeof *qtd);
554         qtd->qtd_dma = dma;
555         qtd->hw_token = cpu_to_le32(QTD_STS_HALT);
556         qtd->hw_next = EHCI_LIST_END;
557         qtd->hw_alt_next = EHCI_LIST_END;
558         INIT_LIST_HEAD(&qtd->qtd_list);
559 }
560 
561 static inline void oxu_qtd_free(struct oxu_hcd *oxu, struct ehci_qtd *qtd)
562 {
563         int index;
564 
565         if (qtd->buffer)
566                 oxu_buf_free(oxu, qtd);
567 
568         spin_lock(&oxu->mem_lock);
569 
570         index = qtd - &oxu->mem->qtd_pool[0];
571         oxu->qtd_used[index] = 0;
572 
573         spin_unlock(&oxu->mem_lock);
574 }
575 
576 static struct ehci_qtd *ehci_qtd_alloc(struct oxu_hcd *oxu)
577 {
578         int i;
579         struct ehci_qtd *qtd = NULL;
580 
581         spin_lock(&oxu->mem_lock);
582 
583         for (i = 0; i < QTD_NUM; i++)
584                 if (!oxu->qtd_used[i])
585                         break;
586 
587         if (i < QTD_NUM) {
588                 qtd = (struct ehci_qtd *) &oxu->mem->qtd_pool[i];
589                 memset(qtd, 0, sizeof *qtd);
590 
591                 qtd->hw_token = cpu_to_le32(QTD_STS_HALT);
592                 qtd->hw_next = EHCI_LIST_END;
593                 qtd->hw_alt_next = EHCI_LIST_END;
594                 INIT_LIST_HEAD(&qtd->qtd_list);
595 
596                 qtd->qtd_dma = virt_to_phys(qtd);
597 
598                 oxu->qtd_used[i] = 1;
599         }
600 
601         spin_unlock(&oxu->mem_lock);
602 
603         return qtd;
604 }
605 
606 static void oxu_qh_free(struct oxu_hcd *oxu, struct ehci_qh *qh)
607 {
608         int index;
609 
610         spin_lock(&oxu->mem_lock);
611 
612         index = qh - &oxu->mem->qh_pool[0];
613         oxu->qh_used[index] = 0;
614 
615         spin_unlock(&oxu->mem_lock);
616 }
617 
618 static void qh_destroy(struct kref *kref)
619 {
620         struct ehci_qh *qh = container_of(kref, struct ehci_qh, kref);
621         struct oxu_hcd *oxu = qh->oxu;
622 
623         /* clean qtds first, and know this is not linked */
624         if (!list_empty(&qh->qtd_list) || qh->qh_next.ptr) {
625                 oxu_dbg(oxu, "unused qh not empty!\n");
626                 BUG();
627         }
628         if (qh->dummy)
629                 oxu_qtd_free(oxu, qh->dummy);
630         oxu_qh_free(oxu, qh);
631 }
632 
633 static struct ehci_qh *oxu_qh_alloc(struct oxu_hcd *oxu)
634 {
635         int i;
636         struct ehci_qh *qh = NULL;
637 
638         spin_lock(&oxu->mem_lock);
639 
640         for (i = 0; i < QHEAD_NUM; i++)
641                 if (!oxu->qh_used[i])
642                         break;
643 
644         if (i < QHEAD_NUM) {
645                 qh = (struct ehci_qh *) &oxu->mem->qh_pool[i];
646                 memset(qh, 0, sizeof *qh);
647 
648                 kref_init(&qh->kref);
649                 qh->oxu = oxu;
650                 qh->qh_dma = virt_to_phys(qh);
651                 INIT_LIST_HEAD(&qh->qtd_list);
652 
653                 /* dummy td enables safe urb queuing */
654                 qh->dummy = ehci_qtd_alloc(oxu);
655                 if (qh->dummy == NULL) {
656                         oxu_dbg(oxu, "no dummy td\n");
657                         oxu->qh_used[i] = 0;
658                         qh = NULL;
659                         goto unlock;
660                 }
661 
662                 oxu->qh_used[i] = 1;
663         }
664 unlock:
665         spin_unlock(&oxu->mem_lock);
666 
667         return qh;
668 }
669 
670 /* to share a qh (cpu threads, or hc) */
671 static inline struct ehci_qh *qh_get(struct ehci_qh *qh)
672 {
673         kref_get(&qh->kref);
674         return qh;
675 }
676 
677 static inline void qh_put(struct ehci_qh *qh)
678 {
679         kref_put(&qh->kref, qh_destroy);
680 }
681 
682 static void oxu_murb_free(struct oxu_hcd *oxu, struct oxu_murb *murb)
683 {
684         int index;
685 
686         spin_lock(&oxu->mem_lock);
687 
688         index = murb - &oxu->murb_pool[0];
689         oxu->murb_used[index] = 0;
690 
691         spin_unlock(&oxu->mem_lock);
692 }
693 
694 static struct oxu_murb *oxu_murb_alloc(struct oxu_hcd *oxu)
695 
696 {
697         int i;
698         struct oxu_murb *murb = NULL;
699 
700         spin_lock(&oxu->mem_lock);
701 
702         for (i = 0; i < MURB_NUM; i++)
703                 if (!oxu->murb_used[i])
704                         break;
705 
706         if (i < MURB_NUM) {
707                 murb = &(oxu->murb_pool)[i];
708 
709                 oxu->murb_used[i] = 1;
710         }
711 
712         spin_unlock(&oxu->mem_lock);
713 
714         return murb;
715 }
716 
717 /* The queue heads and transfer descriptors are managed from pools tied
718  * to each of the "per device" structures.
719  * This is the initialisation and cleanup code.
720  */
721 static void ehci_mem_cleanup(struct oxu_hcd *oxu)
722 {
723         kfree(oxu->murb_pool);
724         oxu->murb_pool = NULL;
725 
726         if (oxu->async)
727                 qh_put(oxu->async);
728         oxu->async = NULL;
729 
730         del_timer(&oxu->urb_timer);
731 
732         oxu->periodic = NULL;
733 
734         /* shadow periodic table */
735         kfree(oxu->pshadow);
736         oxu->pshadow = NULL;
737 }
738 
739 /* Remember to add cleanup code (above) if you add anything here.
740  */
741 static int ehci_mem_init(struct oxu_hcd *oxu, gfp_t flags)
742 {
743         int i;
744 
745         for (i = 0; i < oxu->periodic_size; i++)
746                 oxu->mem->frame_list[i] = EHCI_LIST_END;
747         for (i = 0; i < QHEAD_NUM; i++)
748                 oxu->qh_used[i] = 0;
749         for (i = 0; i < QTD_NUM; i++)
750                 oxu->qtd_used[i] = 0;
751 
752         oxu->murb_pool = kcalloc(MURB_NUM, sizeof(struct oxu_murb), flags);
753         if (!oxu->murb_pool)
754                 goto fail;
755 
756         for (i = 0; i < MURB_NUM; i++)
757                 oxu->murb_used[i] = 0;
758 
759         oxu->async = oxu_qh_alloc(oxu);
760         if (!oxu->async)
761                 goto fail;
762 
763         oxu->periodic = (__le32 *) &oxu->mem->frame_list;
764         oxu->periodic_dma = virt_to_phys(oxu->periodic);
765 
766         for (i = 0; i < oxu->periodic_size; i++)
767                 oxu->periodic[i] = EHCI_LIST_END;
768 
769         /* software shadow of hardware table */
770         oxu->pshadow = kcalloc(oxu->periodic_size, sizeof(void *), flags);
771         if (oxu->pshadow != NULL)
772                 return 0;
773 
774 fail:
775         oxu_dbg(oxu, "couldn't init memory\n");
776         ehci_mem_cleanup(oxu);
777         return -ENOMEM;
778 }
779 
780 /* Fill a qtd, returning how much of the buffer we were able to queue up.
781  */
782 static int qtd_fill(struct ehci_qtd *qtd, dma_addr_t buf, size_t len,
783                                 int token, int maxpacket)
784 {
785         int i, count;
786         u64 addr = buf;
787 
788         /* one buffer entry per 4K ... first might be short or unaligned */
789         qtd->hw_buf[0] = cpu_to_le32((u32)addr);
790         qtd->hw_buf_hi[0] = cpu_to_le32((u32)(addr >> 32));
791         count = 0x1000 - (buf & 0x0fff);        /* rest of that page */
792         if (likely(len < count))                /* ... iff needed */
793                 count = len;
794         else {
795                 buf +=  0x1000;
796                 buf &= ~0x0fff;
797 
798                 /* per-qtd limit: from 16K to 20K (best alignment) */
799                 for (i = 1; count < len && i < 5; i++) {
800                         addr = buf;
801                         qtd->hw_buf[i] = cpu_to_le32((u32)addr);
802                         qtd->hw_buf_hi[i] = cpu_to_le32((u32)(addr >> 32));
803                         buf += 0x1000;
804                         if ((count + 0x1000) < len)
805                                 count += 0x1000;
806                         else
807                                 count = len;
808                 }
809 
810                 /* short packets may only terminate transfers */
811                 if (count != len)
812                         count -= (count % maxpacket);
813         }
814         qtd->hw_token = cpu_to_le32((count << 16) | token);
815         qtd->length = count;
816 
817         return count;
818 }
819 
820 static inline void qh_update(struct oxu_hcd *oxu,
821                                 struct ehci_qh *qh, struct ehci_qtd *qtd)
822 {
823         /* writes to an active overlay are unsafe */
824         BUG_ON(qh->qh_state != QH_STATE_IDLE);
825 
826         qh->hw_qtd_next = QTD_NEXT(qtd->qtd_dma);
827         qh->hw_alt_next = EHCI_LIST_END;
828 
829         /* Except for control endpoints, we make hardware maintain data
830          * toggle (like OHCI) ... here (re)initialize the toggle in the QH,
831          * and set the pseudo-toggle in udev. Only usb_clear_halt() will
832          * ever clear it.
833          */
834         if (!(qh->hw_info1 & cpu_to_le32(1 << 14))) {
835                 unsigned        is_out, epnum;
836 
837                 is_out = !(qtd->hw_token & cpu_to_le32(1 << 8));
838                 epnum = (le32_to_cpup(&qh->hw_info1) >> 8) & 0x0f;
839                 if (unlikely(!usb_gettoggle(qh->dev, epnum, is_out))) {
840                         qh->hw_token &= ~cpu_to_le32(QTD_TOGGLE);
841                         usb_settoggle(qh->dev, epnum, is_out, 1);
842                 }
843         }
844 
845         /* HC must see latest qtd and qh data before we clear ACTIVE+HALT */
846         wmb();
847         qh->hw_token &= cpu_to_le32(QTD_TOGGLE | QTD_STS_PING);
848 }
849 
850 /* If it weren't for a common silicon quirk (writing the dummy into the qh
851  * overlay, so qh->hw_token wrongly becomes inactive/halted), only fault
852  * recovery (including urb dequeue) would need software changes to a QH...
853  */
854 static void qh_refresh(struct oxu_hcd *oxu, struct ehci_qh *qh)
855 {
856         struct ehci_qtd *qtd;
857 
858         if (list_empty(&qh->qtd_list))
859                 qtd = qh->dummy;
860         else {
861                 qtd = list_entry(qh->qtd_list.next,
862                                 struct ehci_qtd, qtd_list);
863                 /* first qtd may already be partially processed */
864                 if (cpu_to_le32(qtd->qtd_dma) == qh->hw_current)
865                         qtd = NULL;
866         }
867 
868         if (qtd)
869                 qh_update(oxu, qh, qtd);
870 }
871 
872 static void qtd_copy_status(struct oxu_hcd *oxu, struct urb *urb,
873                                 size_t length, u32 token)
874 {
875         /* count IN/OUT bytes, not SETUP (even short packets) */
876         if (likely(QTD_PID(token) != 2))
877                 urb->actual_length += length - QTD_LENGTH(token);
878 
879         /* don't modify error codes */
880         if (unlikely(urb->status != -EINPROGRESS))
881                 return;
882 
883         /* force cleanup after short read; not always an error */
884         if (unlikely(IS_SHORT_READ(token)))
885                 urb->status = -EREMOTEIO;
886 
887         /* serious "can't proceed" faults reported by the hardware */
888         if (token & QTD_STS_HALT) {
889                 if (token & QTD_STS_BABBLE) {
890                         /* FIXME "must" disable babbling device's port too */
891                         urb->status = -EOVERFLOW;
892                 } else if (token & QTD_STS_MMF) {
893                         /* fs/ls interrupt xfer missed the complete-split */
894                         urb->status = -EPROTO;
895                 } else if (token & QTD_STS_DBE) {
896                         urb->status = (QTD_PID(token) == 1) /* IN ? */
897                                 ? -ENOSR  /* hc couldn't read data */
898                                 : -ECOMM; /* hc couldn't write data */
899                 } else if (token & QTD_STS_XACT) {
900                         /* timeout, bad crc, wrong PID, etc; retried */
901                         if (QTD_CERR(token))
902                                 urb->status = -EPIPE;
903                         else {
904                                 oxu_dbg(oxu, "devpath %s ep%d%s 3strikes\n",
905                                         urb->dev->devpath,
906                                         usb_pipeendpoint(urb->pipe),
907                                         usb_pipein(urb->pipe) ? "in" : "out");
908                                 urb->status = -EPROTO;
909                         }
910                 /* CERR nonzero + no errors + halt --> stall */
911                 } else if (QTD_CERR(token))
912                         urb->status = -EPIPE;
913                 else    /* unknown */
914                         urb->status = -EPROTO;
915 
916                 oxu_vdbg(oxu, "dev%d ep%d%s qtd token %08x --> status %d\n",
917                         usb_pipedevice(urb->pipe),
918                         usb_pipeendpoint(urb->pipe),
919                         usb_pipein(urb->pipe) ? "in" : "out",
920                         token, urb->status);
921         }
922 }
923 
924 static void ehci_urb_done(struct oxu_hcd *oxu, struct urb *urb)
925 __releases(oxu->lock)
926 __acquires(oxu->lock)
927 {
928         if (likely(urb->hcpriv != NULL)) {
929                 struct ehci_qh  *qh = (struct ehci_qh *) urb->hcpriv;
930 
931                 /* S-mask in a QH means it's an interrupt urb */
932                 if ((qh->hw_info2 & cpu_to_le32(QH_SMASK)) != 0) {
933 
934                         /* ... update hc-wide periodic stats (for usbfs) */
935                         oxu_to_hcd(oxu)->self.bandwidth_int_reqs--;
936                 }
937                 qh_put(qh);
938         }
939 
940         urb->hcpriv = NULL;
941         switch (urb->status) {
942         case -EINPROGRESS:              /* success */
943                 urb->status = 0;
944         default:                        /* fault */
945                 break;
946         case -EREMOTEIO:                /* fault or normal */
947                 if (!(urb->transfer_flags & URB_SHORT_NOT_OK))
948                         urb->status = 0;
949                 break;
950         case -ECONNRESET:               /* canceled */
951         case -ENOENT:
952                 break;
953         }
954 
955 #ifdef OXU_URB_TRACE
956         oxu_dbg(oxu, "%s %s urb %p ep%d%s status %d len %d/%d\n",
957                 __func__, urb->dev->devpath, urb,
958                 usb_pipeendpoint(urb->pipe),
959                 usb_pipein(urb->pipe) ? "in" : "out",
960                 urb->status,
961                 urb->actual_length, urb->transfer_buffer_length);
962 #endif
963 
964         /* complete() can reenter this HCD */
965         spin_unlock(&oxu->lock);
966         usb_hcd_giveback_urb(oxu_to_hcd(oxu), urb, urb->status);
967         spin_lock(&oxu->lock);
968 }
969 
970 static void start_unlink_async(struct oxu_hcd *oxu, struct ehci_qh *qh);
971 static void unlink_async(struct oxu_hcd *oxu, struct ehci_qh *qh);
972 
973 static void intr_deschedule(struct oxu_hcd *oxu, struct ehci_qh *qh);
974 static int qh_schedule(struct oxu_hcd *oxu, struct ehci_qh *qh);
975 
976 #define HALT_BIT cpu_to_le32(QTD_STS_HALT)
977 
978 /* Process and free completed qtds for a qh, returning URBs to drivers.
979  * Chases up to qh->hw_current.  Returns number of completions called,
980  * indicating how much "real" work we did.
981  */
982 static unsigned qh_completions(struct oxu_hcd *oxu, struct ehci_qh *qh)
983 {
984         struct ehci_qtd *last = NULL, *end = qh->dummy;
985         struct list_head *entry, *tmp;
986         int stopped;
987         unsigned count = 0;
988         int do_status = 0;
989         u8 state;
990         struct oxu_murb *murb = NULL;
991 
992         if (unlikely(list_empty(&qh->qtd_list)))
993                 return count;
994 
995         /* completions (or tasks on other cpus) must never clobber HALT
996          * till we've gone through and cleaned everything up, even when
997          * they add urbs to this qh's queue or mark them for unlinking.
998          *
999          * NOTE:  unlinking expects to be done in queue order.
1000          */
1001         state = qh->qh_state;
1002         qh->qh_state = QH_STATE_COMPLETING;
1003         stopped = (state == QH_STATE_IDLE);
1004 
1005         /* remove de-activated QTDs from front of queue.
1006          * after faults (including short reads), cleanup this urb
1007          * then let the queue advance.
1008          * if queue is stopped, handles unlinks.
1009          */
1010         list_for_each_safe(entry, tmp, &qh->qtd_list) {
1011                 struct ehci_qtd *qtd;
1012                 struct urb *urb;
1013                 u32 token = 0;
1014 
1015                 qtd = list_entry(entry, struct ehci_qtd, qtd_list);
1016                 urb = qtd->urb;
1017 
1018                 /* Clean up any state from previous QTD ...*/
1019                 if (last) {
1020                         if (likely(last->urb != urb)) {
1021                                 if (last->urb->complete == NULL) {
1022                                         murb = (struct oxu_murb *) last->urb;
1023                                         last->urb = murb->main;
1024                                         if (murb->last) {
1025                                                 ehci_urb_done(oxu, last->urb);
1026                                                 count++;
1027                                         }
1028                                         oxu_murb_free(oxu, murb);
1029                                 } else {
1030                                         ehci_urb_done(oxu, last->urb);
1031                                         count++;
1032                                 }
1033                         }
1034                         oxu_qtd_free(oxu, last);
1035                         last = NULL;
1036                 }
1037 
1038                 /* ignore urbs submitted during completions we reported */
1039                 if (qtd == end)
1040                         break;
1041 
1042                 /* hardware copies qtd out of qh overlay */
1043                 rmb();
1044                 token = le32_to_cpu(qtd->hw_token);
1045 
1046                 /* always clean up qtds the hc de-activated */
1047                 if ((token & QTD_STS_ACTIVE) == 0) {
1048 
1049                         if ((token & QTD_STS_HALT) != 0) {
1050                                 stopped = 1;
1051 
1052                         /* magic dummy for some short reads; qh won't advance.
1053                          * that silicon quirk can kick in with this dummy too.
1054                          */
1055                         } else if (IS_SHORT_READ(token) &&
1056                                         !(qtd->hw_alt_next & EHCI_LIST_END)) {
1057                                 stopped = 1;
1058                                 goto halt;
1059                         }
1060 
1061                 /* stop scanning when we reach qtds the hc is using */
1062                 } else if (likely(!stopped &&
1063                                 HC_IS_RUNNING(oxu_to_hcd(oxu)->state))) {
1064                         break;
1065 
1066                 } else {
1067                         stopped = 1;
1068 
1069                         if (unlikely(!HC_IS_RUNNING(oxu_to_hcd(oxu)->state)))
1070                                 urb->status = -ESHUTDOWN;
1071 
1072                         /* ignore active urbs unless some previous qtd
1073                          * for the urb faulted (including short read) or
1074                          * its urb was canceled.  we may patch qh or qtds.
1075                          */
1076                         if (likely(urb->status == -EINPROGRESS))
1077                                 continue;
1078 
1079                         /* issue status after short control reads */
1080                         if (unlikely(do_status != 0)
1081                                         && QTD_PID(token) == 0 /* OUT */) {
1082                                 do_status = 0;
1083                                 continue;
1084                         }
1085 
1086                         /* token in overlay may be most current */
1087                         if (state == QH_STATE_IDLE
1088                                         && cpu_to_le32(qtd->qtd_dma)
1089                                                 == qh->hw_current)
1090                                 token = le32_to_cpu(qh->hw_token);
1091 
1092                         /* force halt for unlinked or blocked qh, so we'll
1093                          * patch the qh later and so that completions can't
1094                          * activate it while we "know" it's stopped.
1095                          */
1096                         if ((HALT_BIT & qh->hw_token) == 0) {
1097 halt:
1098                                 qh->hw_token |= HALT_BIT;
1099                                 wmb();
1100                         }
1101                 }
1102 
1103                 /* Remove it from the queue */
1104                 qtd_copy_status(oxu, urb->complete ?
1105                                         urb : ((struct oxu_murb *) urb)->main,
1106                                 qtd->length, token);
1107                 if ((usb_pipein(qtd->urb->pipe)) &&
1108                                 (NULL != qtd->transfer_buffer))
1109                         memcpy(qtd->transfer_buffer, qtd->buffer, qtd->length);
1110                 do_status = (urb->status == -EREMOTEIO)
1111                                 && usb_pipecontrol(urb->pipe);
1112 
1113                 if (stopped && qtd->qtd_list.prev != &qh->qtd_list) {
1114                         last = list_entry(qtd->qtd_list.prev,
1115                                         struct ehci_qtd, qtd_list);
1116                         last->hw_next = qtd->hw_next;
1117                 }
1118                 list_del(&qtd->qtd_list);
1119                 last = qtd;
1120         }
1121 
1122         /* last urb's completion might still need calling */
1123         if (likely(last != NULL)) {
1124                 if (last->urb->complete == NULL) {
1125                         murb = (struct oxu_murb *) last->urb;
1126                         last->urb = murb->main;
1127                         if (murb->last) {
1128                                 ehci_urb_done(oxu, last->urb);
1129                                 count++;
1130                         }
1131                         oxu_murb_free(oxu, murb);
1132                 } else {
1133                         ehci_urb_done(oxu, last->urb);
1134                         count++;
1135                 }
1136                 oxu_qtd_free(oxu, last);
1137         }
1138 
1139         /* restore original state; caller must unlink or relink */
1140         qh->qh_state = state;
1141 
1142         /* be sure the hardware's done with the qh before refreshing
1143          * it after fault cleanup, or recovering from silicon wrongly
1144          * overlaying the dummy qtd (which reduces DMA chatter).
1145          */
1146         if (stopped != 0 || qh->hw_qtd_next == EHCI_LIST_END) {
1147                 switch (state) {
1148                 case QH_STATE_IDLE:
1149                         qh_refresh(oxu, qh);
1150                         break;
1151                 case QH_STATE_LINKED:
1152                         /* should be rare for periodic transfers,
1153                          * except maybe high bandwidth ...
1154                          */
1155                         if ((cpu_to_le32(QH_SMASK)
1156                                         & qh->hw_info2) != 0) {
1157                                 intr_deschedule(oxu, qh);
1158                                 (void) qh_schedule(oxu, qh);
1159                         } else
1160                                 unlink_async(oxu, qh);
1161                         break;
1162                 /* otherwise, unlink already started */
1163                 }
1164         }
1165 
1166         return count;
1167 }
1168 
1169 /* High bandwidth multiplier, as encoded in highspeed endpoint descriptors */
1170 #define hb_mult(wMaxPacketSize)         (1 + (((wMaxPacketSize) >> 11) & 0x03))
1171 /* ... and packet size, for any kind of endpoint descriptor */
1172 #define max_packet(wMaxPacketSize)      ((wMaxPacketSize) & 0x07ff)
1173 
1174 /* Reverse of qh_urb_transaction: free a list of TDs.
1175  * used for cleanup after errors, before HC sees an URB's TDs.
1176  */
1177 static void qtd_list_free(struct oxu_hcd *oxu,
1178                                 struct urb *urb, struct list_head *qtd_list)
1179 {
1180         struct list_head *entry, *temp;
1181 
1182         list_for_each_safe(entry, temp, qtd_list) {
1183                 struct ehci_qtd *qtd;
1184 
1185                 qtd = list_entry(entry, struct ehci_qtd, qtd_list);
1186                 list_del(&qtd->qtd_list);
1187                 oxu_qtd_free(oxu, qtd);
1188         }
1189 }
1190 
1191 /* Create a list of filled qtds for this URB; won't link into qh.
1192  */
1193 static struct list_head *qh_urb_transaction(struct oxu_hcd *oxu,
1194                                                 struct urb *urb,
1195                                                 struct list_head *head,
1196                                                 gfp_t flags)
1197 {
1198         struct ehci_qtd *qtd, *qtd_prev;
1199         dma_addr_t buf;
1200         int len, maxpacket;
1201         int is_input;
1202         u32 token;
1203         void *transfer_buf = NULL;
1204         int ret;
1205 
1206         /*
1207          * URBs map to sequences of QTDs: one logical transaction
1208          */
1209         qtd = ehci_qtd_alloc(oxu);
1210         if (unlikely(!qtd))
1211                 return NULL;
1212         list_add_tail(&qtd->qtd_list, head);
1213         qtd->urb = urb;
1214 
1215         token = QTD_STS_ACTIVE;
1216         token |= (EHCI_TUNE_CERR << 10);
1217         /* for split transactions, SplitXState initialized to zero */
1218 
1219         len = urb->transfer_buffer_length;
1220         is_input = usb_pipein(urb->pipe);
1221         if (!urb->transfer_buffer && urb->transfer_buffer_length && is_input)
1222                 urb->transfer_buffer = phys_to_virt(urb->transfer_dma);
1223 
1224         if (usb_pipecontrol(urb->pipe)) {
1225                 /* SETUP pid */
1226                 ret = oxu_buf_alloc(oxu, qtd, sizeof(struct usb_ctrlrequest));
1227                 if (ret)
1228                         goto cleanup;
1229 
1230                 qtd_fill(qtd, qtd->buffer_dma, sizeof(struct usb_ctrlrequest),
1231                                 token | (2 /* "setup" */ << 8), 8);
1232                 memcpy(qtd->buffer, qtd->urb->setup_packet,
1233                                 sizeof(struct usb_ctrlrequest));
1234 
1235                 /* ... and always at least one more pid */
1236                 token ^= QTD_TOGGLE;
1237                 qtd_prev = qtd;
1238                 qtd = ehci_qtd_alloc(oxu);
1239                 if (unlikely(!qtd))
1240                         goto cleanup;
1241                 qtd->urb = urb;
1242                 qtd_prev->hw_next = QTD_NEXT(qtd->qtd_dma);
1243                 list_add_tail(&qtd->qtd_list, head);
1244 
1245                 /* for zero length DATA stages, STATUS is always IN */
1246                 if (len == 0)
1247                         token |= (1 /* "in" */ << 8);
1248         }
1249 
1250         /*
1251          * Data transfer stage: buffer setup
1252          */
1253 
1254         ret = oxu_buf_alloc(oxu, qtd, len);
1255         if (ret)
1256                 goto cleanup;
1257 
1258         buf = qtd->buffer_dma;
1259         transfer_buf = urb->transfer_buffer;
1260 
1261         if (!is_input)
1262                 memcpy(qtd->buffer, qtd->urb->transfer_buffer, len);
1263 
1264         if (is_input)
1265                 token |= (1 /* "in" */ << 8);
1266         /* else it's already initted to "out" pid (0 << 8) */
1267 
1268         maxpacket = max_packet(usb_maxpacket(urb->dev, urb->pipe, !is_input));
1269 
1270         /*
1271          * buffer gets wrapped in one or more qtds;
1272          * last one may be "short" (including zero len)
1273          * and may serve as a control status ack
1274          */
1275         for (;;) {
1276                 int this_qtd_len;
1277 
1278                 this_qtd_len = qtd_fill(qtd, buf, len, token, maxpacket);
1279                 qtd->transfer_buffer = transfer_buf;
1280                 len -= this_qtd_len;
1281                 buf += this_qtd_len;
1282                 transfer_buf += this_qtd_len;
1283                 if (is_input)
1284                         qtd->hw_alt_next = oxu->async->hw_alt_next;
1285 
1286                 /* qh makes control packets use qtd toggle; maybe switch it */
1287                 if ((maxpacket & (this_qtd_len + (maxpacket - 1))) == 0)
1288                         token ^= QTD_TOGGLE;
1289 
1290                 if (likely(len <= 0))
1291                         break;
1292 
1293                 qtd_prev = qtd;
1294                 qtd = ehci_qtd_alloc(oxu);
1295                 if (unlikely(!qtd))
1296                         goto cleanup;
1297                 if (likely(len > 0)) {
1298                         ret = oxu_buf_alloc(oxu, qtd, len);
1299                         if (ret)
1300                                 goto cleanup;
1301                 }
1302                 qtd->urb = urb;
1303                 qtd_prev->hw_next = QTD_NEXT(qtd->qtd_dma);
1304                 list_add_tail(&qtd->qtd_list, head);
1305         }
1306 
1307         /* unless the bulk/interrupt caller wants a chance to clean
1308          * up after short reads, hc should advance qh past this urb
1309          */
1310         if (likely((urb->transfer_flags & URB_SHORT_NOT_OK) == 0
1311                                 || usb_pipecontrol(urb->pipe)))
1312                 qtd->hw_alt_next = EHCI_LIST_END;
1313 
1314         /*
1315          * control requests may need a terminating data "status" ack;
1316          * bulk ones may need a terminating short packet (zero length).
1317          */
1318         if (likely(urb->transfer_buffer_length != 0)) {
1319                 int     one_more = 0;
1320 
1321                 if (usb_pipecontrol(urb->pipe)) {
1322                         one_more = 1;
1323                         token ^= 0x0100;        /* "in" <--> "out"  */
1324                         token |= QTD_TOGGLE;    /* force DATA1 */
1325                 } else if (usb_pipebulk(urb->pipe)
1326                                 && (urb->transfer_flags & URB_ZERO_PACKET)
1327                                 && !(urb->transfer_buffer_length % maxpacket)) {
1328                         one_more = 1;
1329                 }
1330                 if (one_more) {
1331                         qtd_prev = qtd;
1332                         qtd = ehci_qtd_alloc(oxu);
1333                         if (unlikely(!qtd))
1334                                 goto cleanup;
1335                         qtd->urb = urb;
1336                         qtd_prev->hw_next = QTD_NEXT(qtd->qtd_dma);
1337                         list_add_tail(&qtd->qtd_list, head);
1338 
1339                         /* never any data in such packets */
1340                         qtd_fill(qtd, 0, 0, token, 0);
1341                 }
1342         }
1343 
1344         /* by default, enable interrupt on urb completion */
1345                 qtd->hw_token |= cpu_to_le32(QTD_IOC);
1346         return head;
1347 
1348 cleanup:
1349         qtd_list_free(oxu, urb, head);
1350         return NULL;
1351 }
1352 
1353 /* Each QH holds a qtd list; a QH is used for everything except iso.
1354  *
1355  * For interrupt urbs, the scheduler must set the microframe scheduling
1356  * mask(s) each time the QH gets scheduled.  For highspeed, that's
1357  * just one microframe in the s-mask.  For split interrupt transactions
1358  * there are additional complications: c-mask, maybe FSTNs.
1359  */
1360 static struct ehci_qh *qh_make(struct oxu_hcd *oxu,
1361                                 struct urb *urb, gfp_t flags)
1362 {
1363         struct ehci_qh *qh = oxu_qh_alloc(oxu);
1364         u32 info1 = 0, info2 = 0;
1365         int is_input, type;
1366         int maxp = 0;
1367 
1368         if (!qh)
1369                 return qh;
1370 
1371         /*
1372          * init endpoint/device data for this QH
1373          */
1374         info1 |= usb_pipeendpoint(urb->pipe) << 8;
1375         info1 |= usb_pipedevice(urb->pipe) << 0;
1376 
1377         is_input = usb_pipein(urb->pipe);
1378         type = usb_pipetype(urb->pipe);
1379         maxp = usb_maxpacket(urb->dev, urb->pipe, !is_input);
1380 
1381         /* Compute interrupt scheduling parameters just once, and save.
1382          * - allowing for high bandwidth, how many nsec/uframe are used?
1383          * - split transactions need a second CSPLIT uframe; same question
1384          * - splits also need a schedule gap (for full/low speed I/O)
1385          * - qh has a polling interval
1386          *
1387          * For control/bulk requests, the HC or TT handles these.
1388          */
1389         if (type == PIPE_INTERRUPT) {
1390                 qh->usecs = NS_TO_US(usb_calc_bus_time(USB_SPEED_HIGH,
1391                                                                 is_input, 0,
1392                                 hb_mult(maxp) * max_packet(maxp)));
1393                 qh->start = NO_FRAME;
1394 
1395                 if (urb->dev->speed == USB_SPEED_HIGH) {
1396                         qh->c_usecs = 0;
1397                         qh->gap_uf = 0;
1398 
1399                         qh->period = urb->interval >> 3;
1400                         if (qh->period == 0 && urb->interval != 1) {
1401                                 /* NOTE interval 2 or 4 uframes could work.
1402                                  * But interval 1 scheduling is simpler, and
1403                                  * includes high bandwidth.
1404                                  */
1405                                 oxu_dbg(oxu, "intr period %d uframes, NYET!\n",
1406                                         urb->interval);
1407                                 goto done;
1408                         }
1409                 } else {
1410                         struct usb_tt   *tt = urb->dev->tt;
1411                         int             think_time;
1412 
1413                         /* gap is f(FS/LS transfer times) */
1414                         qh->gap_uf = 1 + usb_calc_bus_time(urb->dev->speed,
1415                                         is_input, 0, maxp) / (125 * 1000);
1416 
1417                         /* FIXME this just approximates SPLIT/CSPLIT times */
1418                         if (is_input) {         /* SPLIT, gap, CSPLIT+DATA */
1419                                 qh->c_usecs = qh->usecs + HS_USECS(0);
1420                                 qh->usecs = HS_USECS(1);
1421                         } else {                /* SPLIT+DATA, gap, CSPLIT */
1422                                 qh->usecs += HS_USECS(1);
1423                                 qh->c_usecs = HS_USECS(0);
1424                         }
1425 
1426                         think_time = tt ? tt->think_time : 0;
1427                         qh->tt_usecs = NS_TO_US(think_time +
1428                                         usb_calc_bus_time(urb->dev->speed,
1429                                         is_input, 0, max_packet(maxp)));
1430                         qh->period = urb->interval;
1431                 }
1432         }
1433 
1434         /* support for tt scheduling, and access to toggles */
1435         qh->dev = urb->dev;
1436 
1437         /* using TT? */
1438         switch (urb->dev->speed) {
1439         case USB_SPEED_LOW:
1440                 info1 |= (1 << 12);     /* EPS "low" */
1441                 /* FALL THROUGH */
1442 
1443         case USB_SPEED_FULL:
1444                 /* EPS 0 means "full" */
1445                 if (type != PIPE_INTERRUPT)
1446                         info1 |= (EHCI_TUNE_RL_TT << 28);
1447                 if (type == PIPE_CONTROL) {
1448                         info1 |= (1 << 27);     /* for TT */
1449                         info1 |= 1 << 14;       /* toggle from qtd */
1450                 }
1451                 info1 |= maxp << 16;
1452 
1453                 info2 |= (EHCI_TUNE_MULT_TT << 30);
1454                 info2 |= urb->dev->ttport << 23;
1455 
1456                 /* NOTE:  if (PIPE_INTERRUPT) { scheduler sets c-mask } */
1457 
1458                 break;
1459 
1460         case USB_SPEED_HIGH:            /* no TT involved */
1461                 info1 |= (2 << 12);     /* EPS "high" */
1462                 if (type == PIPE_CONTROL) {
1463                         info1 |= (EHCI_TUNE_RL_HS << 28);
1464                         info1 |= 64 << 16;      /* usb2 fixed maxpacket */
1465                         info1 |= 1 << 14;       /* toggle from qtd */
1466                         info2 |= (EHCI_TUNE_MULT_HS << 30);
1467                 } else if (type == PIPE_BULK) {
1468                         info1 |= (EHCI_TUNE_RL_HS << 28);
1469                         info1 |= 512 << 16;     /* usb2 fixed maxpacket */
1470                         info2 |= (EHCI_TUNE_MULT_HS << 30);
1471                 } else {                /* PIPE_INTERRUPT */
1472                         info1 |= max_packet(maxp) << 16;
1473                         info2 |= hb_mult(maxp) << 30;
1474                 }
1475                 break;
1476         default:
1477                 oxu_dbg(oxu, "bogus dev %p speed %d\n", urb->dev, urb->dev->speed);
1478 done:
1479                 qh_put(qh);
1480                 return NULL;
1481         }
1482 
1483         /* NOTE:  if (PIPE_INTERRUPT) { scheduler sets s-mask } */
1484 
1485         /* init as live, toggle clear, advance to dummy */
1486         qh->qh_state = QH_STATE_IDLE;
1487         qh->hw_info1 = cpu_to_le32(info1);
1488         qh->hw_info2 = cpu_to_le32(info2);
1489         usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe), !is_input, 1);
1490         qh_refresh(oxu, qh);
1491         return qh;
1492 }
1493 
1494 /* Move qh (and its qtds) onto async queue; maybe enable queue.
1495  */
1496 static void qh_link_async(struct oxu_hcd *oxu, struct ehci_qh *qh)
1497 {
1498         __le32 dma = QH_NEXT(qh->qh_dma);
1499         struct ehci_qh *head;
1500 
1501         /* (re)start the async schedule? */
1502         head = oxu->async;
1503         timer_action_done(oxu, TIMER_ASYNC_OFF);
1504         if (!head->qh_next.qh) {
1505                 u32     cmd = readl(&oxu->regs->command);
1506 
1507                 if (!(cmd & CMD_ASE)) {
1508                         /* in case a clear of CMD_ASE didn't take yet */
1509                         (void)handshake(oxu, &oxu->regs->status,
1510                                         STS_ASS, 0, 150);
1511                         cmd |= CMD_ASE | CMD_RUN;
1512                         writel(cmd, &oxu->regs->command);
1513                         oxu_to_hcd(oxu)->state = HC_STATE_RUNNING;
1514                         /* posted write need not be known to HC yet ... */
1515                 }
1516         }
1517 
1518         /* clear halt and/or toggle; and maybe recover from silicon quirk */
1519         if (qh->qh_state == QH_STATE_IDLE)
1520                 qh_refresh(oxu, qh);
1521 
1522         /* splice right after start */
1523         qh->qh_next = head->qh_next;
1524         qh->hw_next = head->hw_next;
1525         wmb();
1526 
1527         head->qh_next.qh = qh;
1528         head->hw_next = dma;
1529 
1530         qh->qh_state = QH_STATE_LINKED;
1531         /* qtd completions reported later by interrupt */
1532 }
1533 
1534 #define QH_ADDR_MASK    cpu_to_le32(0x7f)
1535 
1536 /*
1537  * For control/bulk/interrupt, return QH with these TDs appended.
1538  * Allocates and initializes the QH if necessary.
1539  * Returns null if it can't allocate a QH it needs to.
1540  * If the QH has TDs (urbs) already, that's great.
1541  */
1542 static struct ehci_qh *qh_append_tds(struct oxu_hcd *oxu,
1543                                 struct urb *urb, struct list_head *qtd_list,
1544                                 int epnum, void **ptr)
1545 {
1546         struct ehci_qh *qh = NULL;
1547 
1548         qh = (struct ehci_qh *) *ptr;
1549         if (unlikely(qh == NULL)) {
1550                 /* can't sleep here, we have oxu->lock... */
1551                 qh = qh_make(oxu, urb, GFP_ATOMIC);
1552                 *ptr = qh;
1553         }
1554         if (likely(qh != NULL)) {
1555                 struct ehci_qtd *qtd;
1556 
1557                 if (unlikely(list_empty(qtd_list)))
1558                         qtd = NULL;
1559                 else
1560                         qtd = list_entry(qtd_list->next, struct ehci_qtd,
1561                                         qtd_list);
1562 
1563                 /* control qh may need patching ... */
1564                 if (unlikely(epnum == 0)) {
1565 
1566                         /* usb_reset_device() briefly reverts to address 0 */
1567                         if (usb_pipedevice(urb->pipe) == 0)
1568                                 qh->hw_info1 &= ~QH_ADDR_MASK;
1569                 }
1570 
1571                 /* just one way to queue requests: swap with the dummy qtd.
1572                  * only hc or qh_refresh() ever modify the overlay.
1573                  */
1574                 if (likely(qtd != NULL)) {
1575                         struct ehci_qtd *dummy;
1576                         dma_addr_t dma;
1577                         __le32 token;
1578 
1579                         /* to avoid racing the HC, use the dummy td instead of
1580                          * the first td of our list (becomes new dummy).  both
1581                          * tds stay deactivated until we're done, when the
1582                          * HC is allowed to fetch the old dummy (4.10.2).
1583                          */
1584                         token = qtd->hw_token;
1585                         qtd->hw_token = HALT_BIT;
1586                         wmb();
1587                         dummy = qh->dummy;
1588 
1589                         dma = dummy->qtd_dma;
1590                         *dummy = *qtd;
1591                         dummy->qtd_dma = dma;
1592 
1593                         list_del(&qtd->qtd_list);
1594                         list_add(&dummy->qtd_list, qtd_list);
1595                         list_splice(qtd_list, qh->qtd_list.prev);
1596 
1597                         ehci_qtd_init(qtd, qtd->qtd_dma);
1598                         qh->dummy = qtd;
1599 
1600                         /* hc must see the new dummy at list end */
1601                         dma = qtd->qtd_dma;
1602                         qtd = list_entry(qh->qtd_list.prev,
1603                                         struct ehci_qtd, qtd_list);
1604                         qtd->hw_next = QTD_NEXT(dma);
1605 
1606                         /* let the hc process these next qtds */
1607                         dummy->hw_token = (token & ~(0x80));
1608                         wmb();
1609                         dummy->hw_token = token;
1610 
1611                         urb->hcpriv = qh_get(qh);
1612                 }
1613         }
1614         return qh;
1615 }
1616 
1617 static int submit_async(struct oxu_hcd  *oxu, struct urb *urb,
1618                         struct list_head *qtd_list, gfp_t mem_flags)
1619 {
1620         struct ehci_qtd *qtd;
1621         int epnum;
1622         unsigned long flags;
1623         struct ehci_qh *qh = NULL;
1624         int rc = 0;
1625 
1626         qtd = list_entry(qtd_list->next, struct ehci_qtd, qtd_list);
1627         epnum = urb->ep->desc.bEndpointAddress;
1628 
1629 #ifdef OXU_URB_TRACE
1630         oxu_dbg(oxu, "%s %s urb %p ep%d%s len %d, qtd %p [qh %p]\n",
1631                 __func__, urb->dev->devpath, urb,
1632                 epnum & 0x0f, (epnum & USB_DIR_IN) ? "in" : "out",
1633                 urb->transfer_buffer_length,
1634                 qtd, urb->ep->hcpriv);
1635 #endif
1636 
1637         spin_lock_irqsave(&oxu->lock, flags);
1638         if (unlikely(!HCD_HW_ACCESSIBLE(oxu_to_hcd(oxu)))) {
1639                 rc = -ESHUTDOWN;
1640                 goto done;
1641         }
1642 
1643         qh = qh_append_tds(oxu, urb, qtd_list, epnum, &urb->ep->hcpriv);
1644         if (unlikely(qh == NULL)) {
1645                 rc = -ENOMEM;
1646                 goto done;
1647         }
1648 
1649         /* Control/bulk operations through TTs don't need scheduling,
1650          * the HC and TT handle it when the TT has a buffer ready.
1651          */
1652         if (likely(qh->qh_state == QH_STATE_IDLE))
1653                 qh_link_async(oxu, qh_get(qh));
1654 done:
1655         spin_unlock_irqrestore(&oxu->lock, flags);
1656         if (unlikely(qh == NULL))
1657                 qtd_list_free(oxu, urb, qtd_list);
1658         return rc;
1659 }
1660 
1661 /* The async qh for the qtds being reclaimed are now unlinked from the HC */
1662 
1663 static void end_unlink_async(struct oxu_hcd *oxu)
1664 {
1665         struct ehci_qh *qh = oxu->reclaim;
1666         struct ehci_qh *next;
1667 
1668         timer_action_done(oxu, TIMER_IAA_WATCHDOG);
1669 
1670         qh->qh_state = QH_STATE_IDLE;
1671         qh->qh_next.qh = NULL;
1672         qh_put(qh);                     /* refcount from reclaim */
1673 
1674         /* other unlink(s) may be pending (in QH_STATE_UNLINK_WAIT) */
1675         next = qh->reclaim;
1676         oxu->reclaim = next;
1677         oxu->reclaim_ready = 0;
1678         qh->reclaim = NULL;
1679 
1680         qh_completions(oxu, qh);
1681 
1682         if (!list_empty(&qh->qtd_list)
1683                         && HC_IS_RUNNING(oxu_to_hcd(oxu)->state))
1684                 qh_link_async(oxu, qh);
1685         else {
1686                 qh_put(qh);             /* refcount from async list */
1687 
1688                 /* it's not free to turn the async schedule on/off; leave it
1689                  * active but idle for a while once it empties.
1690                  */
1691                 if (HC_IS_RUNNING(oxu_to_hcd(oxu)->state)
1692                                 && oxu->async->qh_next.qh == NULL)
1693                         timer_action(oxu, TIMER_ASYNC_OFF);
1694         }
1695 
1696         if (next) {
1697                 oxu->reclaim = NULL;
1698                 start_unlink_async(oxu, next);
1699         }
1700 }
1701 
1702 /* makes sure the async qh will become idle */
1703 /* caller must own oxu->lock */
1704 
1705 static void start_unlink_async(struct oxu_hcd *oxu, struct ehci_qh *qh)
1706 {
1707         int cmd = readl(&oxu->regs->command);
1708         struct ehci_qh *prev;
1709 
1710 #ifdef DEBUG
1711         assert_spin_locked(&oxu->lock);
1712         if (oxu->reclaim || (qh->qh_state != QH_STATE_LINKED
1713                                 && qh->qh_state != QH_STATE_UNLINK_WAIT))
1714                 BUG();
1715 #endif
1716 
1717         /* stop async schedule right now? */
1718         if (unlikely(qh == oxu->async)) {
1719                 /* can't get here without STS_ASS set */
1720                 if (oxu_to_hcd(oxu)->state != HC_STATE_HALT
1721                                 && !oxu->reclaim) {
1722                         /* ... and CMD_IAAD clear */
1723                         writel(cmd & ~CMD_ASE, &oxu->regs->command);
1724                         wmb();
1725                         /* handshake later, if we need to */
1726                         timer_action_done(oxu, TIMER_ASYNC_OFF);
1727                 }
1728                 return;
1729         }
1730 
1731         qh->qh_state = QH_STATE_UNLINK;
1732         oxu->reclaim = qh = qh_get(qh);
1733 
1734         prev = oxu->async;
1735         while (prev->qh_next.qh != qh)
1736                 prev = prev->qh_next.qh;
1737 
1738         prev->hw_next = qh->hw_next;
1739         prev->qh_next = qh->qh_next;
1740         wmb();
1741 
1742         if (unlikely(oxu_to_hcd(oxu)->state == HC_STATE_HALT)) {
1743                 /* if (unlikely(qh->reclaim != 0))
1744                  *      this will recurse, probably not much
1745                  */
1746                 end_unlink_async(oxu);
1747                 return;
1748         }
1749 
1750         oxu->reclaim_ready = 0;
1751         cmd |= CMD_IAAD;
1752         writel(cmd, &oxu->regs->command);
1753         (void) readl(&oxu->regs->command);
1754         timer_action(oxu, TIMER_IAA_WATCHDOG);
1755 }
1756 
1757 static void scan_async(struct oxu_hcd *oxu)
1758 {
1759         struct ehci_qh *qh;
1760         enum ehci_timer_action action = TIMER_IO_WATCHDOG;
1761 
1762         if (!++(oxu->stamp))
1763                 oxu->stamp++;
1764         timer_action_done(oxu, TIMER_ASYNC_SHRINK);
1765 rescan:
1766         qh = oxu->async->qh_next.qh;
1767         if (likely(qh != NULL)) {
1768                 do {
1769                         /* clean any finished work for this qh */
1770                         if (!list_empty(&qh->qtd_list)
1771                                         && qh->stamp != oxu->stamp) {
1772                                 int temp;
1773 
1774                                 /* unlinks could happen here; completion
1775                                  * reporting drops the lock.  rescan using
1776                                  * the latest schedule, but don't rescan
1777                                  * qhs we already finished (no looping).
1778                                  */
1779                                 qh = qh_get(qh);
1780                                 qh->stamp = oxu->stamp;
1781                                 temp = qh_completions(oxu, qh);
1782                                 qh_put(qh);
1783                                 if (temp != 0)
1784                                         goto rescan;
1785                         }
1786 
1787                         /* unlink idle entries, reducing HC PCI usage as well
1788                          * as HCD schedule-scanning costs.  delay for any qh
1789                          * we just scanned, there's a not-unusual case that it
1790                          * doesn't stay idle for long.
1791                          * (plus, avoids some kind of re-activation race.)
1792                          */
1793                         if (list_empty(&qh->qtd_list)) {
1794                                 if (qh->stamp == oxu->stamp)
1795                                         action = TIMER_ASYNC_SHRINK;
1796                                 else if (!oxu->reclaim
1797                                             && qh->qh_state == QH_STATE_LINKED)
1798                                         start_unlink_async(oxu, qh);
1799                         }
1800 
1801                         qh = qh->qh_next.qh;
1802                 } while (qh);
1803         }
1804         if (action == TIMER_ASYNC_SHRINK)
1805                 timer_action(oxu, TIMER_ASYNC_SHRINK);
1806 }
1807 
1808 /*
1809  * periodic_next_shadow - return "next" pointer on shadow list
1810  * @periodic: host pointer to qh/itd/sitd
1811  * @tag: hardware tag for type of this record
1812  */
1813 static union ehci_shadow *periodic_next_shadow(union ehci_shadow *periodic,
1814                                                 __le32 tag)
1815 {
1816         switch (tag) {
1817         default:
1818         case Q_TYPE_QH:
1819                 return &periodic->qh->qh_next;
1820         }
1821 }
1822 
1823 /* caller must hold oxu->lock */
1824 static void periodic_unlink(struct oxu_hcd *oxu, unsigned frame, void *ptr)
1825 {
1826         union ehci_shadow *prev_p = &oxu->pshadow[frame];
1827         __le32 *hw_p = &oxu->periodic[frame];
1828         union ehci_shadow here = *prev_p;
1829 
1830         /* find predecessor of "ptr"; hw and shadow lists are in sync */
1831         while (here.ptr && here.ptr != ptr) {
1832                 prev_p = periodic_next_shadow(prev_p, Q_NEXT_TYPE(*hw_p));
1833                 hw_p = here.hw_next;
1834                 here = *prev_p;
1835         }
1836         /* an interrupt entry (at list end) could have been shared */
1837         if (!here.ptr)
1838                 return;
1839 
1840         /* update shadow and hardware lists ... the old "next" pointers
1841          * from ptr may still be in use, the caller updates them.
1842          */
1843         *prev_p = *periodic_next_shadow(&here, Q_NEXT_TYPE(*hw_p));
1844         *hw_p = *here.hw_next;
1845 }
1846 
1847 /* how many of the uframe's 125 usecs are allocated? */
1848 static unsigned short periodic_usecs(struct oxu_hcd *oxu,
1849                                         unsigned frame, unsigned uframe)
1850 {
1851         __le32 *hw_p = &oxu->periodic[frame];
1852         union ehci_shadow *q = &oxu->pshadow[frame];
1853         unsigned usecs = 0;
1854 
1855         while (q->ptr) {
1856                 switch (Q_NEXT_TYPE(*hw_p)) {
1857                 case Q_TYPE_QH:
1858                 default:
1859                         /* is it in the S-mask? */
1860                         if (q->qh->hw_info2 & cpu_to_le32(1 << uframe))
1861                                 usecs += q->qh->usecs;
1862                         /* ... or C-mask? */
1863                         if (q->qh->hw_info2 & cpu_to_le32(1 << (8 + uframe)))
1864                                 usecs += q->qh->c_usecs;
1865                         hw_p = &q->qh->hw_next;
1866                         q = &q->qh->qh_next;
1867                         break;
1868                 }
1869         }
1870 #ifdef DEBUG
1871         if (usecs > 100)
1872                 oxu_err(oxu, "uframe %d sched overrun: %d usecs\n",
1873                                                 frame * 8 + uframe, usecs);
1874 #endif
1875         return usecs;
1876 }
1877 
1878 static int enable_periodic(struct oxu_hcd *oxu)
1879 {
1880         u32 cmd;
1881         int status;
1882 
1883         /* did clearing PSE did take effect yet?
1884          * takes effect only at frame boundaries...
1885          */
1886         status = handshake(oxu, &oxu->regs->status, STS_PSS, 0, 9 * 125);
1887         if (status != 0) {
1888                 oxu_to_hcd(oxu)->state = HC_STATE_HALT;
1889                 usb_hc_died(oxu_to_hcd(oxu));
1890                 return status;
1891         }
1892 
1893         cmd = readl(&oxu->regs->command) | CMD_PSE;
1894         writel(cmd, &oxu->regs->command);
1895         /* posted write ... PSS happens later */
1896         oxu_to_hcd(oxu)->state = HC_STATE_RUNNING;
1897 
1898         /* make sure ehci_work scans these */
1899         oxu->next_uframe = readl(&oxu->regs->frame_index)
1900                 % (oxu->periodic_size << 3);
1901         return 0;
1902 }
1903 
1904 static int disable_periodic(struct oxu_hcd *oxu)
1905 {
1906         u32 cmd;
1907         int status;
1908 
1909         /* did setting PSE not take effect yet?
1910          * takes effect only at frame boundaries...
1911          */
1912         status = handshake(oxu, &oxu->regs->status, STS_PSS, STS_PSS, 9 * 125);
1913         if (status != 0) {
1914                 oxu_to_hcd(oxu)->state = HC_STATE_HALT;
1915                 usb_hc_died(oxu_to_hcd(oxu));
1916                 return status;
1917         }
1918 
1919         cmd = readl(&oxu->regs->command) & ~CMD_PSE;
1920         writel(cmd, &oxu->regs->command);
1921         /* posted write ... */
1922 
1923         oxu->next_uframe = -1;
1924         return 0;
1925 }
1926 
1927 /* periodic schedule slots have iso tds (normal or split) first, then a
1928  * sparse tree for active interrupt transfers.
1929  *
1930  * this just links in a qh; caller guarantees uframe masks are set right.
1931  * no FSTN support (yet; oxu 0.96+)
1932  */
1933 static int qh_link_periodic(struct oxu_hcd *oxu, struct ehci_qh *qh)
1934 {
1935         unsigned i;
1936         unsigned period = qh->period;
1937 
1938         dev_dbg(&qh->dev->dev,
1939                 "link qh%d-%04x/%p start %d [%d/%d us]\n",
1940                 period, le32_to_cpup(&qh->hw_info2) & (QH_CMASK | QH_SMASK),
1941                 qh, qh->start, qh->usecs, qh->c_usecs);
1942 
1943         /* high bandwidth, or otherwise every microframe */
1944         if (period == 0)
1945                 period = 1;
1946 
1947         for (i = qh->start; i < oxu->periodic_size; i += period) {
1948                 union ehci_shadow       *prev = &oxu->pshadow[i];
1949                 __le32                  *hw_p = &oxu->periodic[i];
1950                 union ehci_shadow       here = *prev;
1951                 __le32                  type = 0;
1952 
1953                 /* skip the iso nodes at list head */
1954                 while (here.ptr) {
1955                         type = Q_NEXT_TYPE(*hw_p);
1956                         if (type == Q_TYPE_QH)
1957                                 break;
1958                         prev = periodic_next_shadow(prev, type);
1959                         hw_p = &here.qh->hw_next;
1960                         here = *prev;
1961                 }
1962 
1963                 /* sorting each branch by period (slow-->fast)
1964                  * enables sharing interior tree nodes
1965                  */
1966                 while (here.ptr && qh != here.qh) {
1967                         if (qh->period > here.qh->period)
1968                                 break;
1969                         prev = &here.qh->qh_next;
1970                         hw_p = &here.qh->hw_next;
1971                         here = *prev;
1972                 }
1973                 /* link in this qh, unless some earlier pass did that */
1974                 if (qh != here.qh) {
1975                         qh->qh_next = here;
1976                         if (here.qh)
1977                                 qh->hw_next = *hw_p;
1978                         wmb();
1979                         prev->qh = qh;
1980                         *hw_p = QH_NEXT(qh->qh_dma);
1981                 }
1982         }
1983         qh->qh_state = QH_STATE_LINKED;
1984         qh_get(qh);
1985 
1986         /* update per-qh bandwidth for usbfs */
1987         oxu_to_hcd(oxu)->self.bandwidth_allocated += qh->period
1988                 ? ((qh->usecs + qh->c_usecs) / qh->period)
1989                 : (qh->usecs * 8);
1990 
1991         /* maybe enable periodic schedule processing */
1992         if (!oxu->periodic_sched++)
1993                 return enable_periodic(oxu);
1994 
1995         return 0;
1996 }
1997 
1998 static void qh_unlink_periodic(struct oxu_hcd *oxu, struct ehci_qh *qh)
1999 {
2000         unsigned i;
2001         unsigned period;
2002 
2003         /* FIXME:
2004          *   IF this isn't high speed
2005          *   and this qh is active in the current uframe
2006          *   (and overlay token SplitXstate is false?)
2007          * THEN
2008          *   qh->hw_info1 |= cpu_to_le32(1 << 7 "ignore");
2009          */
2010 
2011         /* high bandwidth, or otherwise part of every microframe */
2012         period = qh->period;
2013         if (period == 0)
2014                 period = 1;
2015 
2016         for (i = qh->start; i < oxu->periodic_size; i += period)
2017                 periodic_unlink(oxu, i, qh);
2018 
2019         /* update per-qh bandwidth for usbfs */
2020         oxu_to_hcd(oxu)->self.bandwidth_allocated -= qh->period
2021                 ? ((qh->usecs + qh->c_usecs) / qh->period)
2022                 : (qh->usecs * 8);
2023 
2024         dev_dbg(&qh->dev->dev,
2025                 "unlink qh%d-%04x/%p start %d [%d/%d us]\n",
2026                 qh->period,
2027                 le32_to_cpup(&qh->hw_info2) & (QH_CMASK | QH_SMASK),
2028                 qh, qh->start, qh->usecs, qh->c_usecs);
2029 
2030         /* qh->qh_next still "live" to HC */
2031         qh->qh_state = QH_STATE_UNLINK;
2032         qh->qh_next.ptr = NULL;
2033         qh_put(qh);
2034 
2035         /* maybe turn off periodic schedule */
2036         oxu->periodic_sched--;
2037         if (!oxu->periodic_sched)
2038                 (void) disable_periodic(oxu);
2039 }
2040 
2041 static void intr_deschedule(struct oxu_hcd *oxu, struct ehci_qh *qh)
2042 {
2043         unsigned wait;
2044 
2045         qh_unlink_periodic(oxu, qh);
2046 
2047         /* simple/paranoid:  always delay, expecting the HC needs to read
2048          * qh->hw_next or finish a writeback after SPLIT/CSPLIT ... and
2049          * expect hub_wq to clean up after any CSPLITs we won't issue.
2050          * active high speed queues may need bigger delays...
2051          */
2052         if (list_empty(&qh->qtd_list)
2053                 || (cpu_to_le32(QH_CMASK) & qh->hw_info2) != 0)
2054                 wait = 2;
2055         else
2056                 wait = 55;      /* worst case: 3 * 1024 */
2057 
2058         udelay(wait);
2059         qh->qh_state = QH_STATE_IDLE;
2060         qh->hw_next = EHCI_LIST_END;
2061         wmb();
2062 }
2063 
2064 static int check_period(struct oxu_hcd *oxu,
2065                         unsigned frame, unsigned uframe,
2066                         unsigned period, unsigned usecs)
2067 {
2068         int claimed;
2069 
2070         /* complete split running into next frame?
2071          * given FSTN support, we could sometimes check...
2072          */
2073         if (uframe >= 8)
2074                 return 0;
2075 
2076         /*
2077          * 80% periodic == 100 usec/uframe available
2078          * convert "usecs we need" to "max already claimed"
2079          */
2080         usecs = 100 - usecs;
2081 
2082         /* we "know" 2 and 4 uframe intervals were rejected; so
2083          * for period 0, check _every_ microframe in the schedule.
2084          */
2085         if (unlikely(period == 0)) {
2086                 do {
2087                         for (uframe = 0; uframe < 7; uframe++) {
2088                                 claimed = periodic_usecs(oxu, frame, uframe);
2089                                 if (claimed > usecs)
2090                                         return 0;
2091                         }
2092                 } while ((frame += 1) < oxu->periodic_size);
2093 
2094         /* just check the specified uframe, at that period */
2095         } else {
2096                 do {
2097                         claimed = periodic_usecs(oxu, frame, uframe);
2098                         if (claimed > usecs)
2099                                 return 0;
2100                 } while ((frame += period) < oxu->periodic_size);
2101         }
2102 
2103         return 1;
2104 }
2105 
2106 static int check_intr_schedule(struct oxu_hcd   *oxu,
2107                                 unsigned frame, unsigned uframe,
2108                                 const struct ehci_qh *qh, __le32 *c_maskp)
2109 {
2110         int retval = -ENOSPC;
2111 
2112         if (qh->c_usecs && uframe >= 6)         /* FSTN territory? */
2113                 goto done;
2114 
2115         if (!check_period(oxu, frame, uframe, qh->period, qh->usecs))
2116                 goto done;
2117         if (!qh->c_usecs) {
2118                 retval = 0;
2119                 *c_maskp = 0;
2120                 goto done;
2121         }
2122 
2123 done:
2124         return retval;
2125 }
2126 
2127 /* "first fit" scheduling policy used the first time through,
2128  * or when the previous schedule slot can't be re-used.
2129  */
2130 static int qh_schedule(struct oxu_hcd *oxu, struct ehci_qh *qh)
2131 {
2132         int             status;
2133         unsigned        uframe;
2134         __le32          c_mask;
2135         unsigned        frame;          /* 0..(qh->period - 1), or NO_FRAME */
2136 
2137         qh_refresh(oxu, qh);
2138         qh->hw_next = EHCI_LIST_END;
2139         frame = qh->start;
2140 
2141         /* reuse the previous schedule slots, if we can */
2142         if (frame < qh->period) {
2143                 uframe = ffs(le32_to_cpup(&qh->hw_info2) & QH_SMASK);
2144                 status = check_intr_schedule(oxu, frame, --uframe,
2145                                 qh, &c_mask);
2146         } else {
2147                 uframe = 0;
2148                 c_mask = 0;
2149                 status = -ENOSPC;
2150         }
2151 
2152         /* else scan the schedule to find a group of slots such that all
2153          * uframes have enough periodic bandwidth available.
2154          */
2155         if (status) {
2156                 /* "normal" case, uframing flexible except with splits */
2157                 if (qh->period) {
2158                         frame = qh->period - 1;
2159                         do {
2160                                 for (uframe = 0; uframe < 8; uframe++) {
2161                                         status = check_intr_schedule(oxu,
2162                                                         frame, uframe, qh,
2163                                                         &c_mask);
2164                                         if (status == 0)
2165                                                 break;
2166                                 }
2167                         } while (status && frame--);
2168 
2169                 /* qh->period == 0 means every uframe */
2170                 } else {
2171                         frame = 0;
2172                         status = check_intr_schedule(oxu, 0, 0, qh, &c_mask);
2173                 }
2174                 if (status)
2175                         goto done;
2176                 qh->start = frame;
2177 
2178                 /* reset S-frame and (maybe) C-frame masks */
2179                 qh->hw_info2 &= cpu_to_le32(~(QH_CMASK | QH_SMASK));
2180                 qh->hw_info2 |= qh->period
2181                         ? cpu_to_le32(1 << uframe)
2182                         : cpu_to_le32(QH_SMASK);
2183                 qh->hw_info2 |= c_mask;
2184         } else
2185                 oxu_dbg(oxu, "reused qh %p schedule\n", qh);
2186 
2187         /* stuff into the periodic schedule */
2188         status = qh_link_periodic(oxu, qh);
2189 done:
2190         return status;
2191 }
2192 
2193 static int intr_submit(struct oxu_hcd *oxu, struct urb *urb,
2194                         struct list_head *qtd_list, gfp_t mem_flags)
2195 {
2196         unsigned epnum;
2197         unsigned long flags;
2198         struct ehci_qh *qh;
2199         int status = 0;
2200         struct list_head        empty;
2201 
2202         /* get endpoint and transfer/schedule data */
2203         epnum = urb->ep->desc.bEndpointAddress;
2204 
2205         spin_lock_irqsave(&oxu->lock, flags);
2206 
2207         if (unlikely(!HCD_HW_ACCESSIBLE(oxu_to_hcd(oxu)))) {
2208                 status = -ESHUTDOWN;
2209                 goto done;
2210         }
2211 
2212         /* get qh and force any scheduling errors */
2213         INIT_LIST_HEAD(&empty);
2214         qh = qh_append_tds(oxu, urb, &empty, epnum, &urb->ep->hcpriv);
2215         if (qh == NULL) {
2216                 status = -ENOMEM;
2217                 goto done;
2218         }
2219         if (qh->qh_state == QH_STATE_IDLE) {
2220                 status = qh_schedule(oxu, qh);
2221                 if (status != 0)
2222                         goto done;
2223         }
2224 
2225         /* then queue the urb's tds to the qh */
2226         qh = qh_append_tds(oxu, urb, qtd_list, epnum, &urb->ep->hcpriv);
2227         BUG_ON(qh == NULL);
2228 
2229         /* ... update usbfs periodic stats */
2230         oxu_to_hcd(oxu)->self.bandwidth_int_reqs++;
2231 
2232 done:
2233         spin_unlock_irqrestore(&oxu->lock, flags);
2234         if (status)
2235                 qtd_list_free(oxu, urb, qtd_list);
2236 
2237         return status;
2238 }
2239 
2240 static inline int itd_submit(struct oxu_hcd *oxu, struct urb *urb,
2241                                                 gfp_t mem_flags)
2242 {
2243         oxu_dbg(oxu, "iso support is missing!\n");
2244         return -ENOSYS;
2245 }
2246 
2247 static inline int sitd_submit(struct oxu_hcd *oxu, struct urb *urb,
2248                                                 gfp_t mem_flags)
2249 {
2250         oxu_dbg(oxu, "split iso support is missing!\n");
2251         return -ENOSYS;
2252 }
2253 
2254 static void scan_periodic(struct oxu_hcd *oxu)
2255 {
2256         unsigned frame, clock, now_uframe, mod;
2257         unsigned modified;
2258 
2259         mod = oxu->periodic_size << 3;
2260 
2261         /*
2262          * When running, scan from last scan point up to "now"
2263          * else clean up by scanning everything that's left.
2264          * Touches as few pages as possible:  cache-friendly.
2265          */
2266         now_uframe = oxu->next_uframe;
2267         if (HC_IS_RUNNING(oxu_to_hcd(oxu)->state))
2268                 clock = readl(&oxu->regs->frame_index);
2269         else
2270                 clock = now_uframe + mod - 1;
2271         clock %= mod;
2272 
2273         for (;;) {
2274                 union ehci_shadow       q, *q_p;
2275                 __le32                  type, *hw_p;
2276                 unsigned                uframes;
2277 
2278                 /* don't scan past the live uframe */
2279                 frame = now_uframe >> 3;
2280                 if (frame == (clock >> 3))
2281                         uframes = now_uframe & 0x07;
2282                 else {
2283                         /* safe to scan the whole frame at once */
2284                         now_uframe |= 0x07;
2285                         uframes = 8;
2286                 }
2287 
2288 restart:
2289                 /* scan each element in frame's queue for completions */
2290                 q_p = &oxu->pshadow[frame];
2291                 hw_p = &oxu->periodic[frame];
2292                 q.ptr = q_p->ptr;
2293                 type = Q_NEXT_TYPE(*hw_p);
2294                 modified = 0;
2295 
2296                 while (q.ptr != NULL) {
2297                         union ehci_shadow temp;
2298                         int live;
2299 
2300                         live = HC_IS_RUNNING(oxu_to_hcd(oxu)->state);
2301                         switch (type) {
2302                         case Q_TYPE_QH:
2303                                 /* handle any completions */
2304                                 temp.qh = qh_get(q.qh);
2305                                 type = Q_NEXT_TYPE(q.qh->hw_next);
2306                                 q = q.qh->qh_next;
2307                                 modified = qh_completions(oxu, temp.qh);
2308                                 if (unlikely(list_empty(&temp.qh->qtd_list)))
2309                                         intr_deschedule(oxu, temp.qh);
2310                                 qh_put(temp.qh);
2311                                 break;
2312                         default:
2313                                 oxu_dbg(oxu, "corrupt type %d frame %d shadow %p\n",
2314                                         type, frame, q.ptr);
2315                                 q.ptr = NULL;
2316                         }
2317 
2318                         /* assume completion callbacks modify the queue */
2319                         if (unlikely(modified))
2320                                 goto restart;
2321                 }
2322 
2323                 /* Stop when we catch up to the HC */
2324 
2325                 /* FIXME:  this assumes we won't get lapped when
2326                  * latencies climb; that should be rare, but...
2327                  * detect it, and just go all the way around.
2328                  * FLR might help detect this case, so long as latencies
2329                  * don't exceed periodic_size msec (default 1.024 sec).
2330                  */
2331 
2332                 /* FIXME: likewise assumes HC doesn't halt mid-scan */
2333 
2334                 if (now_uframe == clock) {
2335                         unsigned        now;
2336 
2337                         if (!HC_IS_RUNNING(oxu_to_hcd(oxu)->state))
2338                                 break;
2339                         oxu->next_uframe = now_uframe;
2340                         now = readl(&oxu->regs->frame_index) % mod;
2341                         if (now_uframe == now)
2342                                 break;
2343 
2344                         /* rescan the rest of this frame, then ... */
2345                         clock = now;
2346                 } else {
2347                         now_uframe++;
2348                         now_uframe %= mod;
2349                 }
2350         }
2351 }
2352 
2353 /* On some systems, leaving remote wakeup enabled prevents system shutdown.
2354  * The firmware seems to think that powering off is a wakeup event!
2355  * This routine turns off remote wakeup and everything else, on all ports.
2356  */
2357 static void ehci_turn_off_all_ports(struct oxu_hcd *oxu)
2358 {
2359         int port = HCS_N_PORTS(oxu->hcs_params);
2360 
2361         while (port--)
2362                 writel(PORT_RWC_BITS, &oxu->regs->port_status[port]);
2363 }
2364 
2365 static void ehci_port_power(struct oxu_hcd *oxu, int is_on)
2366 {
2367         unsigned port;
2368 
2369         if (!HCS_PPC(oxu->hcs_params))
2370                 return;
2371 
2372         oxu_dbg(oxu, "...power%s ports...\n", is_on ? "up" : "down");
2373         for (port = HCS_N_PORTS(oxu->hcs_params); port > 0; )
2374                 (void) oxu_hub_control(oxu_to_hcd(oxu),
2375                                 is_on ? SetPortFeature : ClearPortFeature,
2376                                 USB_PORT_FEAT_POWER,
2377                                 port--, NULL, 0);
2378         msleep(20);
2379 }
2380 
2381 /* Called from some interrupts, timers, and so on.
2382  * It calls driver completion functions, after dropping oxu->lock.
2383  */
2384 static void ehci_work(struct oxu_hcd *oxu)
2385 {
2386         timer_action_done(oxu, TIMER_IO_WATCHDOG);
2387         if (oxu->reclaim_ready)
2388                 end_unlink_async(oxu);
2389 
2390         /* another CPU may drop oxu->lock during a schedule scan while
2391          * it reports urb completions.  this flag guards against bogus
2392          * attempts at re-entrant schedule scanning.
2393          */
2394         if (oxu->scanning)
2395                 return;
2396         oxu->scanning = 1;
2397         scan_async(oxu);
2398         if (oxu->next_uframe != -1)
2399                 scan_periodic(oxu);
2400         oxu->scanning = 0;
2401 
2402         /* the IO watchdog guards against hardware or driver bugs that
2403          * misplace IRQs, and should let us run completely without IRQs.
2404          * such lossage has been observed on both VT6202 and VT8235.
2405          */
2406         if (HC_IS_RUNNING(oxu_to_hcd(oxu)->state) &&
2407                         (oxu->async->qh_next.ptr != NULL ||
2408                          oxu->periodic_sched != 0))
2409                 timer_action(oxu, TIMER_IO_WATCHDOG);
2410 }
2411 
2412 static void unlink_async(struct oxu_hcd *oxu, struct ehci_qh *qh)
2413 {
2414         /* if we need to use IAA and it's busy, defer */
2415         if (qh->qh_state == QH_STATE_LINKED
2416                         && oxu->reclaim
2417                         && HC_IS_RUNNING(oxu_to_hcd(oxu)->state)) {
2418                 struct ehci_qh          *last;
2419 
2420                 for (last = oxu->reclaim;
2421                                 last->reclaim;
2422                                 last = last->reclaim)
2423                         continue;
2424                 qh->qh_state = QH_STATE_UNLINK_WAIT;
2425                 last->reclaim = qh;
2426 
2427         /* bypass IAA if the hc can't care */
2428         } else if (!HC_IS_RUNNING(oxu_to_hcd(oxu)->state) && oxu->reclaim)
2429                 end_unlink_async(oxu);
2430 
2431         /* something else might have unlinked the qh by now */
2432         if (qh->qh_state == QH_STATE_LINKED)
2433                 start_unlink_async(oxu, qh);
2434 }
2435 
2436 /*
2437  * USB host controller methods
2438  */
2439 
2440 static irqreturn_t oxu210_hcd_irq(struct usb_hcd *hcd)
2441 {
2442         struct oxu_hcd *oxu = hcd_to_oxu(hcd);
2443         u32 status, pcd_status = 0;
2444         int bh;
2445 
2446         spin_lock(&oxu->lock);
2447 
2448         status = readl(&oxu->regs->status);
2449 
2450         /* e.g. cardbus physical eject */
2451         if (status == ~(u32) 0) {
2452                 oxu_dbg(oxu, "device removed\n");
2453                 goto dead;
2454         }
2455 
2456         /* Shared IRQ? */
2457         status &= INTR_MASK;
2458         if (!status || unlikely(hcd->state == HC_STATE_HALT)) {
2459                 spin_unlock(&oxu->lock);
2460                 return IRQ_NONE;
2461         }
2462 
2463         /* clear (just) interrupts */
2464         writel(status, &oxu->regs->status);
2465         readl(&oxu->regs->command);     /* unblock posted write */
2466         bh = 0;
2467 
2468 #ifdef OXU_VERBOSE_DEBUG
2469         /* unrequested/ignored: Frame List Rollover */
2470         dbg_status(oxu, "irq", status);
2471 #endif
2472 
2473         /* INT, ERR, and IAA interrupt rates can be throttled */
2474 
2475         /* normal [4.15.1.2] or error [4.15.1.1] completion */
2476         if (likely((status & (STS_INT|STS_ERR)) != 0))
2477                 bh = 1;
2478 
2479         /* complete the unlinking of some qh [4.15.2.3] */
2480         if (status & STS_IAA) {
2481                 oxu->reclaim_ready = 1;
2482                 bh = 1;
2483         }
2484 
2485         /* remote wakeup [4.3.1] */
2486         if (status & STS_PCD) {
2487                 unsigned i = HCS_N_PORTS(oxu->hcs_params);
2488                 pcd_status = status;
2489 
2490                 /* resume root hub? */
2491                 if (!(readl(&oxu->regs->command) & CMD_RUN))
2492                         usb_hcd_resume_root_hub(hcd);
2493 
2494                 while (i--) {
2495                         int pstatus = readl(&oxu->regs->port_status[i]);
2496 
2497                         if (pstatus & PORT_OWNER)
2498                                 continue;
2499                         if (!(pstatus & PORT_RESUME)
2500                                         || oxu->reset_done[i] != 0)
2501                                 continue;
2502 
2503                         /* start 20 msec resume signaling from this port,
2504                          * and make hub_wq collect PORT_STAT_C_SUSPEND to
2505                          * stop that signaling.
2506                          */
2507                         oxu->reset_done[i] = jiffies + msecs_to_jiffies(20);
2508                         oxu_dbg(oxu, "port %d remote wakeup\n", i + 1);
2509                         mod_timer(&hcd->rh_timer, oxu->reset_done[i]);
2510                 }
2511         }
2512 
2513         /* PCI errors [4.15.2.4] */
2514         if (unlikely((status & STS_FATAL) != 0)) {
2515                 /* bogus "fatal" IRQs appear on some chips... why?  */
2516                 status = readl(&oxu->regs->status);
2517                 dbg_cmd(oxu, "fatal", readl(&oxu->regs->command));
2518                 dbg_status(oxu, "fatal", status);
2519                 if (status & STS_HALT) {
2520                         oxu_err(oxu, "fatal error\n");
2521 dead:
2522                         ehci_reset(oxu);
2523                         writel(0, &oxu->regs->configured_flag);
2524                         usb_hc_died(hcd);
2525                         /* generic layer kills/unlinks all urbs, then
2526                          * uses oxu_stop to clean up the rest
2527                          */
2528                         bh = 1;
2529                 }
2530         }
2531 
2532         if (bh)
2533                 ehci_work(oxu);
2534         spin_unlock(&oxu->lock);
2535         if (pcd_status & STS_PCD)
2536                 usb_hcd_poll_rh_status(hcd);
2537         return IRQ_HANDLED;
2538 }
2539 
2540 static irqreturn_t oxu_irq(struct usb_hcd *hcd)
2541 {
2542         struct oxu_hcd *oxu = hcd_to_oxu(hcd);
2543         int ret = IRQ_HANDLED;
2544 
2545         u32 status = oxu_readl(hcd->regs, OXU_CHIPIRQSTATUS);
2546         u32 enable = oxu_readl(hcd->regs, OXU_CHIPIRQEN_SET);
2547 
2548         /* Disable all interrupt */
2549         oxu_writel(hcd->regs, OXU_CHIPIRQEN_CLR, enable);
2550 
2551         if ((oxu->is_otg && (status & OXU_USBOTGI)) ||
2552                 (!oxu->is_otg && (status & OXU_USBSPHI)))
2553                 oxu210_hcd_irq(hcd);
2554         else
2555                 ret = IRQ_NONE;
2556 
2557         /* Enable all interrupt back */
2558         oxu_writel(hcd->regs, OXU_CHIPIRQEN_SET, enable);
2559 
2560         return ret;
2561 }
2562 
2563 static void oxu_watchdog(unsigned long param)
2564 {
2565         struct oxu_hcd  *oxu = (struct oxu_hcd *) param;
2566         unsigned long flags;
2567 
2568         spin_lock_irqsave(&oxu->lock, flags);
2569 
2570         /* lost IAA irqs wedge things badly; seen with a vt8235 */
2571         if (oxu->reclaim) {
2572                 u32 status = readl(&oxu->regs->status);
2573                 if (status & STS_IAA) {
2574                         oxu_vdbg(oxu, "lost IAA\n");
2575                         writel(STS_IAA, &oxu->regs->status);
2576                         oxu->reclaim_ready = 1;
2577                 }
2578         }
2579 
2580         /* stop async processing after it's idled a bit */
2581         if (test_bit(TIMER_ASYNC_OFF, &oxu->actions))
2582                 start_unlink_async(oxu, oxu->async);
2583 
2584         /* oxu could run by timer, without IRQs ... */
2585         ehci_work(oxu);
2586 
2587         spin_unlock_irqrestore(&oxu->lock, flags);
2588 }
2589 
2590 /* One-time init, only for memory state.
2591  */
2592 static int oxu_hcd_init(struct usb_hcd *hcd)
2593 {
2594         struct oxu_hcd *oxu = hcd_to_oxu(hcd);
2595         u32 temp;
2596         int retval;
2597         u32 hcc_params;
2598 
2599         spin_lock_init(&oxu->lock);
2600 
2601         init_timer(&oxu->watchdog);
2602         oxu->watchdog.function = oxu_watchdog;
2603         oxu->watchdog.data = (unsigned long) oxu;
2604 
2605         /*
2606          * hw default: 1K periodic list heads, one per frame.
2607          * periodic_size can shrink by USBCMD update if hcc_params allows.
2608          */
2609         oxu->periodic_size = DEFAULT_I_TDPS;
2610         retval = ehci_mem_init(oxu, GFP_KERNEL);
2611         if (retval < 0)
2612                 return retval;
2613 
2614         /* controllers may cache some of the periodic schedule ... */
2615         hcc_params = readl(&oxu->caps->hcc_params);
2616         if (HCC_ISOC_CACHE(hcc_params))         /* full frame cache */
2617                 oxu->i_thresh = 8;
2618         else                                    /* N microframes cached */
2619                 oxu->i_thresh = 2 + HCC_ISOC_THRES(hcc_params);
2620 
2621         oxu->reclaim = NULL;
2622         oxu->reclaim_ready = 0;
2623         oxu->next_uframe = -1;
2624 
2625         /*
2626          * dedicate a qh for the async ring head, since we couldn't unlink
2627          * a 'real' qh without stopping the async schedule [4.8].  use it
2628          * as the 'reclamation list head' too.
2629          * its dummy is used in hw_alt_next of many tds, to prevent the qh
2630          * from automatically advancing to the next td after short reads.
2631          */
2632         oxu->async->qh_next.qh = NULL;
2633         oxu->async->hw_next = QH_NEXT(oxu->async->qh_dma);
2634         oxu->async->hw_info1 = cpu_to_le32(QH_HEAD);
2635         oxu->async->hw_token = cpu_to_le32(QTD_STS_HALT);
2636         oxu->async->hw_qtd_next = EHCI_LIST_END;
2637         oxu->async->qh_state = QH_STATE_LINKED;
2638         oxu->async->hw_alt_next = QTD_NEXT(oxu->async->dummy->qtd_dma);
2639 
2640         /* clear interrupt enables, set irq latency */
2641         if (log2_irq_thresh < 0 || log2_irq_thresh > 6)
2642                 log2_irq_thresh = 0;
2643         temp = 1 << (16 + log2_irq_thresh);
2644         if (HCC_CANPARK(hcc_params)) {
2645                 /* HW default park == 3, on hardware that supports it (like
2646                  * NVidia and ALI silicon), maximizes throughput on the async
2647                  * schedule by avoiding QH fetches between transfers.
2648                  *
2649                  * With fast usb storage devices and NForce2, "park" seems to
2650                  * make problems:  throughput reduction (!), data errors...
2651                  */
2652                 if (park) {
2653                         park = min(park, (unsigned) 3);
2654                         temp |= CMD_PARK;
2655                         temp |= park << 8;
2656                 }
2657                 oxu_dbg(oxu, "park %d\n", park);
2658         }
2659         if (HCC_PGM_FRAMELISTLEN(hcc_params)) {
2660                 /* periodic schedule size can be smaller than default */
2661                 temp &= ~(3 << 2);
2662                 temp |= (EHCI_TUNE_FLS << 2);
2663         }
2664         oxu->command = temp;
2665 
2666         return 0;
2667 }
2668 
2669 /* Called during probe() after chip reset completes.
2670  */
2671 static int oxu_reset(struct usb_hcd *hcd)
2672 {
2673         struct oxu_hcd *oxu = hcd_to_oxu(hcd);
2674         int ret;
2675 
2676         spin_lock_init(&oxu->mem_lock);
2677         INIT_LIST_HEAD(&oxu->urb_list);
2678         oxu->urb_len = 0;
2679 
2680         /* FIMXE */
2681         hcd->self.controller->dma_mask = NULL;
2682 
2683         if (oxu->is_otg) {
2684                 oxu->caps = hcd->regs + OXU_OTG_CAP_OFFSET;
2685                 oxu->regs = hcd->regs + OXU_OTG_CAP_OFFSET + \
2686                         HC_LENGTH(readl(&oxu->caps->hc_capbase));
2687 
2688                 oxu->mem = hcd->regs + OXU_SPH_MEM;
2689         } else {
2690                 oxu->caps = hcd->regs + OXU_SPH_CAP_OFFSET;
2691                 oxu->regs = hcd->regs + OXU_SPH_CAP_OFFSET + \
2692                         HC_LENGTH(readl(&oxu->caps->hc_capbase));
2693 
2694                 oxu->mem = hcd->regs + OXU_OTG_MEM;
2695         }
2696 
2697         oxu->hcs_params = readl(&oxu->caps->hcs_params);
2698         oxu->sbrn = 0x20;
2699 
2700         ret = oxu_hcd_init(hcd);
2701         if (ret)
2702                 return ret;
2703 
2704         return 0;
2705 }
2706 
2707 static int oxu_run(struct usb_hcd *hcd)
2708 {
2709         struct oxu_hcd *oxu = hcd_to_oxu(hcd);
2710         int retval;
2711         u32 temp, hcc_params;
2712 
2713         hcd->uses_new_polling = 1;
2714 
2715         /* EHCI spec section 4.1 */
2716         retval = ehci_reset(oxu);
2717         if (retval != 0) {
2718                 ehci_mem_cleanup(oxu);
2719                 return retval;
2720         }
2721         writel(oxu->periodic_dma, &oxu->regs->frame_list);
2722         writel((u32) oxu->async->qh_dma, &oxu->regs->async_next);
2723 
2724         /* hcc_params controls whether oxu->regs->segment must (!!!)
2725          * be used; it constrains QH/ITD/SITD and QTD locations.
2726          * pci_pool consistent memory always uses segment zero.
2727          * streaming mappings for I/O buffers, like pci_map_single(),
2728          * can return segments above 4GB, if the device allows.
2729          *
2730          * NOTE:  the dma mask is visible through dma_supported(), so
2731          * drivers can pass this info along ... like NETIF_F_HIGHDMA,
2732          * Scsi_Host.highmem_io, and so forth.  It's readonly to all
2733          * host side drivers though.
2734          */
2735         hcc_params = readl(&oxu->caps->hcc_params);
2736         if (HCC_64BIT_ADDR(hcc_params))
2737                 writel(0, &oxu->regs->segment);
2738 
2739         oxu->command &= ~(CMD_LRESET | CMD_IAAD | CMD_PSE |
2740                                 CMD_ASE | CMD_RESET);
2741         oxu->command |= CMD_RUN;
2742         writel(oxu->command, &oxu->regs->command);
2743         dbg_cmd(oxu, "init", oxu->command);
2744 
2745         /*
2746          * Start, enabling full USB 2.0 functionality ... usb 1.1 devices
2747          * are explicitly handed to companion controller(s), so no TT is
2748          * involved with the root hub.  (Except where one is integrated,
2749          * and there's no companion controller unless maybe for USB OTG.)
2750          */
2751         hcd->state = HC_STATE_RUNNING;
2752         writel(FLAG_CF, &oxu->regs->configured_flag);
2753         readl(&oxu->regs->command);     /* unblock posted writes */
2754 
2755         temp = HC_VERSION(readl(&oxu->caps->hc_capbase));
2756         oxu_info(oxu, "USB %x.%x started, quasi-EHCI %x.%02x, driver %s%s\n",
2757                 ((oxu->sbrn & 0xf0)>>4), (oxu->sbrn & 0x0f),
2758                 temp >> 8, temp & 0xff, DRIVER_VERSION,
2759                 ignore_oc ? ", overcurrent ignored" : "");
2760 
2761         writel(INTR_MASK, &oxu->regs->intr_enable); /* Turn On Interrupts */
2762 
2763         return 0;
2764 }
2765 
2766 static void oxu_stop(struct usb_hcd *hcd)
2767 {
2768         struct oxu_hcd *oxu = hcd_to_oxu(hcd);
2769 
2770         /* Turn off port power on all root hub ports. */
2771         ehci_port_power(oxu, 0);
2772 
2773         /* no more interrupts ... */
2774         del_timer_sync(&oxu->watchdog);
2775 
2776         spin_lock_irq(&oxu->lock);
2777         if (HC_IS_RUNNING(hcd->state))
2778                 ehci_quiesce(oxu);
2779 
2780         ehci_reset(oxu);
2781         writel(0, &oxu->regs->intr_enable);
2782         spin_unlock_irq(&oxu->lock);
2783 
2784         /* let companion controllers work when we aren't */
2785         writel(0, &oxu->regs->configured_flag);
2786 
2787         /* root hub is shut down separately (first, when possible) */
2788         spin_lock_irq(&oxu->lock);
2789         if (oxu->async)
2790                 ehci_work(oxu);
2791         spin_unlock_irq(&oxu->lock);
2792         ehci_mem_cleanup(oxu);
2793 
2794         dbg_status(oxu, "oxu_stop completed", readl(&oxu->regs->status));
2795 }
2796 
2797 /* Kick in for silicon on any bus (not just pci, etc).
2798  * This forcibly disables dma and IRQs, helping kexec and other cases
2799  * where the next system software may expect clean state.
2800  */
2801 static void oxu_shutdown(struct usb_hcd *hcd)
2802 {
2803         struct oxu_hcd *oxu = hcd_to_oxu(hcd);
2804 
2805         (void) ehci_halt(oxu);
2806         ehci_turn_off_all_ports(oxu);
2807 
2808         /* make BIOS/etc use companion controller during reboot */
2809         writel(0, &oxu->regs->configured_flag);
2810 
2811         /* unblock posted writes */
2812         readl(&oxu->regs->configured_flag);
2813 }
2814 
2815 /* Non-error returns are a promise to giveback() the urb later
2816  * we drop ownership so next owner (or urb unlink) can get it
2817  *
2818  * urb + dev is in hcd.self.controller.urb_list
2819  * we're queueing TDs onto software and hardware lists
2820  *
2821  * hcd-specific init for hcpriv hasn't been done yet
2822  *
2823  * NOTE:  control, bulk, and interrupt share the same code to append TDs
2824  * to a (possibly active) QH, and the same QH scanning code.
2825  */
2826 static int __oxu_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
2827                                 gfp_t mem_flags)
2828 {
2829         struct oxu_hcd *oxu = hcd_to_oxu(hcd);
2830         struct list_head qtd_list;
2831 
2832         INIT_LIST_HEAD(&qtd_list);
2833 
2834         switch (usb_pipetype(urb->pipe)) {
2835         case PIPE_CONTROL:
2836         case PIPE_BULK:
2837         default:
2838                 if (!qh_urb_transaction(oxu, urb, &qtd_list, mem_flags))
2839                         return -ENOMEM;
2840                 return submit_async(oxu, urb, &qtd_list, mem_flags);
2841 
2842         case PIPE_INTERRUPT:
2843                 if (!qh_urb_transaction(oxu, urb, &qtd_list, mem_flags))
2844                         return -ENOMEM;
2845                 return intr_submit(oxu, urb, &qtd_list, mem_flags);
2846 
2847         case PIPE_ISOCHRONOUS:
2848                 if (urb->dev->speed == USB_SPEED_HIGH)
2849                         return itd_submit(oxu, urb, mem_flags);
2850                 else
2851                         return sitd_submit(oxu, urb, mem_flags);
2852         }
2853 }
2854 
2855 /* This function is responsible for breaking URBs with big data size
2856  * into smaller size and processing small urbs in sequence.
2857  */
2858 static int oxu_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
2859                                 gfp_t mem_flags)
2860 {
2861         struct oxu_hcd *oxu = hcd_to_oxu(hcd);
2862         int num, rem;
2863         int transfer_buffer_length;
2864         void *transfer_buffer;
2865         struct urb *murb;
2866         int i, ret;
2867 
2868         /* If not bulk pipe just enqueue the URB */
2869         if (!usb_pipebulk(urb->pipe))
2870                 return __oxu_urb_enqueue(hcd, urb, mem_flags);
2871 
2872         /* Otherwise we should verify the USB transfer buffer size! */
2873         transfer_buffer = urb->transfer_buffer;
2874         transfer_buffer_length = urb->transfer_buffer_length;
2875 
2876         num = urb->transfer_buffer_length / 4096;
2877         rem = urb->transfer_buffer_length % 4096;
2878         if (rem != 0)
2879                 num++;
2880 
2881         /* If URB is smaller than 4096 bytes just enqueue it! */
2882         if (num == 1)
2883                 return __oxu_urb_enqueue(hcd, urb, mem_flags);
2884 
2885         /* Ok, we have more job to do! :) */
2886 
2887         for (i = 0; i < num - 1; i++) {
2888                 /* Get free micro URB poll till a free urb is received */
2889 
2890                 do {
2891                         murb = (struct urb *) oxu_murb_alloc(oxu);
2892                         if (!murb)
2893                                 schedule();
2894                 } while (!murb);
2895 
2896                 /* Coping the urb */
2897                 memcpy(murb, urb, sizeof(struct urb));
2898 
2899                 murb->transfer_buffer_length = 4096;
2900                 murb->transfer_buffer = transfer_buffer + i * 4096;
2901 
2902                 /* Null pointer for the encodes that this is a micro urb */
2903                 murb->complete = NULL;
2904 
2905                 ((struct oxu_murb *) murb)->main = urb;
2906                 ((struct oxu_murb *) murb)->last = 0;
2907 
2908                 /* This loop is to guarantee urb to be processed when there's
2909                  * not enough resources at a particular time by retrying.
2910                  */
2911                 do {
2912                         ret  = __oxu_urb_enqueue(hcd, murb, mem_flags);
2913                         if (ret)
2914                                 schedule();
2915                 } while (ret);
2916         }
2917 
2918         /* Last urb requires special handling  */
2919 
2920         /* Get free micro URB poll till a free urb is received */
2921         do {
2922                 murb = (struct urb *) oxu_murb_alloc(oxu);
2923                 if (!murb)
2924                         schedule();
2925         } while (!murb);
2926 
2927         /* Coping the urb */
2928         memcpy(murb, urb, sizeof(struct urb));
2929 
2930         murb->transfer_buffer_length = rem > 0 ? rem : 4096;
2931         murb->transfer_buffer = transfer_buffer + (num - 1) * 4096;
2932 
2933         /* Null pointer for the encodes that this is a micro urb */
2934         murb->complete = NULL;
2935 
2936         ((struct oxu_murb *) murb)->main = urb;
2937         ((struct oxu_murb *) murb)->last = 1;
2938 
2939         do {
2940                 ret = __oxu_urb_enqueue(hcd, murb, mem_flags);
2941                 if (ret)
2942                         schedule();
2943         } while (ret);
2944 
2945         return ret;
2946 }
2947 
2948 /* Remove from hardware lists.
2949  * Completions normally happen asynchronously
2950  */
2951 static int oxu_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
2952 {
2953         struct oxu_hcd *oxu = hcd_to_oxu(hcd);
2954         struct ehci_qh *qh;
2955         unsigned long flags;
2956 
2957         spin_lock_irqsave(&oxu->lock, flags);
2958         switch (usb_pipetype(urb->pipe)) {
2959         case PIPE_CONTROL:
2960         case PIPE_BULK:
2961         default:
2962                 qh = (struct ehci_qh *) urb->hcpriv;
2963                 if (!qh)
2964                         break;
2965                 unlink_async(oxu, qh);
2966                 break;
2967 
2968         case PIPE_INTERRUPT:
2969                 qh = (struct ehci_qh *) urb->hcpriv;
2970                 if (!qh)
2971                         break;
2972                 switch (qh->qh_state) {
2973                 case QH_STATE_LINKED:
2974                         intr_deschedule(oxu, qh);
2975                         /* FALL THROUGH */
2976                 case QH_STATE_IDLE:
2977                         qh_completions(oxu, qh);
2978                         break;
2979                 default:
2980                         oxu_dbg(oxu, "bogus qh %p state %d\n",
2981                                         qh, qh->qh_state);
2982                         goto done;
2983                 }
2984 
2985                 /* reschedule QH iff another request is queued */
2986                 if (!list_empty(&qh->qtd_list)
2987                                 && HC_IS_RUNNING(hcd->state)) {
2988                         int status;
2989 
2990                         status = qh_schedule(oxu, qh);
2991                         spin_unlock_irqrestore(&oxu->lock, flags);
2992 
2993                         if (status != 0) {
2994                                 /* shouldn't happen often, but ...
2995                                  * FIXME kill those tds' urbs
2996                                  */
2997                                 dev_err(hcd->self.controller,
2998                                         "can't reschedule qh %p, err %d\n", qh,
2999                                         status);
3000                         }
3001                         return status;
3002                 }
3003                 break;
3004         }
3005 done:
3006         spin_unlock_irqrestore(&oxu->lock, flags);
3007         return 0;
3008 }
3009 
3010 /* Bulk qh holds the data toggle */
3011 static void oxu_endpoint_disable(struct usb_hcd *hcd,
3012                                         struct usb_host_endpoint *ep)
3013 {
3014         struct oxu_hcd *oxu = hcd_to_oxu(hcd);
3015         unsigned long           flags;
3016         struct ehci_qh          *qh, *tmp;
3017 
3018         /* ASSERT:  any requests/urbs are being unlinked */
3019         /* ASSERT:  nobody can be submitting urbs for this any more */
3020 
3021 rescan:
3022         spin_lock_irqsave(&oxu->lock, flags);
3023         qh = ep->hcpriv;
3024         if (!qh)
3025                 goto done;
3026 
3027         /* endpoints can be iso streams.  for now, we don't
3028          * accelerate iso completions ... so spin a while.
3029          */
3030         if (qh->hw_info1 == 0) {
3031                 oxu_vdbg(oxu, "iso delay\n");
3032                 goto idle_timeout;
3033         }
3034 
3035         if (!HC_IS_RUNNING(hcd->state))
3036                 qh->qh_state = QH_STATE_IDLE;
3037         switch (qh->qh_state) {
3038         case QH_STATE_LINKED:
3039                 for (tmp = oxu->async->qh_next.qh;
3040                                 tmp && tmp != qh;
3041                                 tmp = tmp->qh_next.qh)
3042                         continue;
3043                 /* periodic qh self-unlinks on empty */
3044                 if (!tmp)
3045                         goto nogood;
3046                 unlink_async(oxu, qh);
3047                 /* FALL THROUGH */
3048         case QH_STATE_UNLINK:           /* wait for hw to finish? */
3049 idle_timeout:
3050                 spin_unlock_irqrestore(&oxu->lock, flags);
3051                 schedule_timeout_uninterruptible(1);
3052                 goto rescan;
3053         case QH_STATE_IDLE:             /* fully unlinked */
3054                 if (list_empty(&qh->qtd_list)) {
3055                         qh_put(qh);
3056                         break;
3057                 }
3058                 /* else FALL THROUGH */
3059         default:
3060 nogood:
3061                 /* caller was supposed to have unlinked any requests;
3062                  * that's not our job.  just leak this memory.
3063                  */
3064                 oxu_err(oxu, "qh %p (#%02x) state %d%s\n",
3065                         qh, ep->desc.bEndpointAddress, qh->qh_state,
3066                         list_empty(&qh->qtd_list) ? "" : "(has tds)");
3067                 break;
3068         }
3069         ep->hcpriv = NULL;
3070 done:
3071         spin_unlock_irqrestore(&oxu->lock, flags);
3072 }
3073 
3074 static int oxu_get_frame(struct usb_hcd *hcd)
3075 {
3076         struct oxu_hcd *oxu = hcd_to_oxu(hcd);
3077 
3078         return (readl(&oxu->regs->frame_index) >> 3) %
3079                 oxu->periodic_size;
3080 }
3081 
3082 /* Build "status change" packet (one or two bytes) from HC registers */
3083 static int oxu_hub_status_data(struct usb_hcd *hcd, char *buf)
3084 {
3085         struct oxu_hcd *oxu = hcd_to_oxu(hcd);
3086         u32 temp, mask, status = 0;
3087         int ports, i, retval = 1;
3088         unsigned long flags;
3089 
3090         /* if !PM_RUNTIME, root hub timers won't get shut down ... */
3091         if (!HC_IS_RUNNING(hcd->state))
3092                 return 0;
3093 
3094         /* init status to no-changes */
3095         buf[0] = 0;
3096         ports = HCS_N_PORTS(oxu->hcs_params);
3097         if (ports > 7) {
3098                 buf[1] = 0;
3099                 retval++;
3100         }
3101 
3102         /* Some boards (mostly VIA?) report bogus overcurrent indications,
3103          * causing massive log spam unless we completely ignore them.  It
3104          * may be relevant that VIA VT8235 controllers, where PORT_POWER is
3105          * always set, seem to clear PORT_OCC and PORT_CSC when writing to
3106          * PORT_POWER; that's surprising, but maybe within-spec.
3107          */
3108         if (!ignore_oc)
3109                 mask = PORT_CSC | PORT_PEC | PORT_OCC;
3110         else
3111                 mask = PORT_CSC | PORT_PEC;
3112 
3113         /* no hub change reports (bit 0) for now (power, ...) */
3114 
3115         /* port N changes (bit N)? */
3116         spin_lock_irqsave(&oxu->lock, flags);
3117         for (i = 0; i < ports; i++) {
3118                 temp = readl(&oxu->regs->port_status[i]);
3119 
3120                 /*
3121                  * Return status information even for ports with OWNER set.
3122                  * Otherwise hub_wq wouldn't see the disconnect event when a
3123                  * high-speed device is switched over to the companion
3124                  * controller by the user.
3125                  */
3126 
3127                 if (!(temp & PORT_CONNECT))
3128                         oxu->reset_done[i] = 0;
3129                 if ((temp & mask) != 0 || ((temp & PORT_RESUME) != 0 &&
3130                                 time_after_eq(jiffies, oxu->reset_done[i]))) {
3131                         if (i < 7)
3132                                 buf[0] |= 1 << (i + 1);
3133                         else
3134                                 buf[1] |= 1 << (i - 7);
3135                         status = STS_PCD;
3136                 }
3137         }
3138         /* FIXME autosuspend idle root hubs */
3139         spin_unlock_irqrestore(&oxu->lock, flags);
3140         return status ? retval : 0;
3141 }
3142 
3143 /* Returns the speed of a device attached to a port on the root hub. */
3144 static inline unsigned int oxu_port_speed(struct oxu_hcd *oxu,
3145                                                 unsigned int portsc)
3146 {
3147         switch ((portsc >> 26) & 3) {
3148         case 0:
3149                 return 0;
3150         case 1:
3151                 return USB_PORT_STAT_LOW_SPEED;
3152         case 2:
3153         default:
3154                 return USB_PORT_STAT_HIGH_SPEED;
3155         }
3156 }
3157 
3158 #define PORT_WAKE_BITS  (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
3159 static int oxu_hub_control(struct usb_hcd *hcd, u16 typeReq,
3160                                 u16 wValue, u16 wIndex, char *buf, u16 wLength)
3161 {
3162         struct oxu_hcd *oxu = hcd_to_oxu(hcd);
3163         int ports = HCS_N_PORTS(oxu->hcs_params);
3164         u32 __iomem *status_reg = &oxu->regs->port_status[wIndex - 1];
3165         u32 temp, status;
3166         unsigned long   flags;
3167         int retval = 0;
3168         unsigned selector;
3169 
3170         /*
3171          * FIXME:  support SetPortFeatures USB_PORT_FEAT_INDICATOR.
3172          * HCS_INDICATOR may say we can change LEDs to off/amber/green.
3173          * (track current state ourselves) ... blink for diagnostics,
3174          * power, "this is the one", etc.  EHCI spec supports this.
3175          */
3176 
3177         spin_lock_irqsave(&oxu->lock, flags);
3178         switch (typeReq) {
3179         case ClearHubFeature:
3180                 switch (wValue) {
3181                 case C_HUB_LOCAL_POWER:
3182                 case C_HUB_OVER_CURRENT:
3183                         /* no hub-wide feature/status flags */
3184                         break;
3185                 default:
3186                         goto error;
3187                 }
3188                 break;
3189         case ClearPortFeature:
3190                 if (!wIndex || wIndex > ports)
3191                         goto error;
3192                 wIndex--;
3193                 temp = readl(status_reg);
3194 
3195                 /*
3196                  * Even if OWNER is set, so the port is owned by the
3197                  * companion controller, hub_wq needs to be able to clear
3198                  * the port-change status bits (especially
3199                  * USB_PORT_STAT_C_CONNECTION).
3200                  */
3201 
3202                 switch (wValue) {
3203                 case USB_PORT_FEAT_ENABLE:
3204                         writel(temp & ~PORT_PE, status_reg);
3205                         break;
3206                 case USB_PORT_FEAT_C_ENABLE:
3207                         writel((temp & ~PORT_RWC_BITS) | PORT_PEC, status_reg);
3208                         break;
3209                 case USB_PORT_FEAT_SUSPEND:
3210                         if (temp & PORT_RESET)
3211                                 goto error;
3212                         if (temp & PORT_SUSPEND) {
3213                                 if ((temp & PORT_PE) == 0)
3214                                         goto error;
3215                                 /* resume signaling for 20 msec */
3216                                 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
3217                                 writel(temp | PORT_RESUME, status_reg);
3218                                 oxu->reset_done[wIndex] = jiffies
3219                                                 + msecs_to_jiffies(20);
3220                         }
3221                         break;
3222                 case USB_PORT_FEAT_C_SUSPEND:
3223                         /* we auto-clear this feature */
3224                         break;
3225                 case USB_PORT_FEAT_POWER:
3226                         if (HCS_PPC(oxu->hcs_params))
3227                                 writel(temp & ~(PORT_RWC_BITS | PORT_POWER),
3228                                           status_reg);
3229                         break;
3230                 case USB_PORT_FEAT_C_CONNECTION:
3231                         writel((temp & ~PORT_RWC_BITS) | PORT_CSC, status_reg);
3232                         break;
3233                 case USB_PORT_FEAT_C_OVER_CURRENT:
3234                         writel((temp & ~PORT_RWC_BITS) | PORT_OCC, status_reg);
3235                         break;
3236                 case USB_PORT_FEAT_C_RESET:
3237                         /* GetPortStatus clears reset */
3238                         break;
3239                 default:
3240                         goto error;
3241                 }
3242                 readl(&oxu->regs->command);     /* unblock posted write */
3243                 break;
3244         case GetHubDescriptor:
3245                 ehci_hub_descriptor(oxu, (struct usb_hub_descriptor *)
3246                         buf);
3247                 break;
3248         case GetHubStatus:
3249                 /* no hub-wide feature/status flags */
3250                 memset(buf, 0, 4);
3251                 break;
3252         case GetPortStatus:
3253                 if (!wIndex || wIndex > ports)
3254                         goto error;
3255                 wIndex--;
3256                 status = 0;
3257                 temp = readl(status_reg);
3258 
3259                 /* wPortChange bits */
3260                 if (temp & PORT_CSC)
3261                         status |= USB_PORT_STAT_C_CONNECTION << 16;
3262                 if (temp & PORT_PEC)
3263                         status |= USB_PORT_STAT_C_ENABLE << 16;
3264                 if ((temp & PORT_OCC) && !ignore_oc)
3265                         status |= USB_PORT_STAT_C_OVERCURRENT << 16;
3266 
3267                 /* whoever resumes must GetPortStatus to complete it!! */
3268                 if (temp & PORT_RESUME) {
3269 
3270                         /* Remote Wakeup received? */
3271                         if (!oxu->reset_done[wIndex]) {
3272                                 /* resume signaling for 20 msec */
3273                                 oxu->reset_done[wIndex] = jiffies
3274                                                 + msecs_to_jiffies(20);
3275                                 /* check the port again */
3276                                 mod_timer(&oxu_to_hcd(oxu)->rh_timer,
3277                                                 oxu->reset_done[wIndex]);
3278                         }
3279 
3280                         /* resume completed? */
3281                         else if (time_after_eq(jiffies,
3282                                         oxu->reset_done[wIndex])) {
3283                                 status |= USB_PORT_STAT_C_SUSPEND << 16;
3284                                 oxu->reset_done[wIndex] = 0;
3285 
3286                                 /* stop resume signaling */
3287                                 temp = readl(status_reg);
3288                                 writel(temp & ~(PORT_RWC_BITS | PORT_RESUME),
3289                                         status_reg);
3290                                 retval = handshake(oxu, status_reg,
3291                                            PORT_RESUME, 0, 2000 /* 2msec */);
3292                                 if (retval != 0) {
3293                                         oxu_err(oxu,
3294                                                 "port %d resume error %d\n",
3295                                                 wIndex + 1, retval);
3296                                         goto error;
3297                                 }
3298                                 temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10));
3299                         }
3300                 }
3301 
3302                 /* whoever resets must GetPortStatus to complete it!! */
3303                 if ((temp & PORT_RESET)
3304                                 && time_after_eq(jiffies,
3305                                         oxu->reset_done[wIndex])) {
3306                         status |= USB_PORT_STAT_C_RESET << 16;
3307                         oxu->reset_done[wIndex] = 0;
3308 
3309                         /* force reset to complete */
3310                         writel(temp & ~(PORT_RWC_BITS | PORT_RESET),
3311                                         status_reg);
3312                         /* REVISIT:  some hardware needs 550+ usec to clear
3313                          * this bit; seems too long to spin routinely...
3314                          */
3315                         retval = handshake(oxu, status_reg,
3316                                         PORT_RESET, 0, 750);
3317                         if (retval != 0) {
3318                                 oxu_err(oxu, "port %d reset error %d\n",
3319                                         wIndex + 1, retval);
3320                                 goto error;
3321                         }
3322 
3323                         /* see what we found out */
3324                         temp = check_reset_complete(oxu, wIndex, status_reg,
3325                                         readl(status_reg));
3326                 }
3327 
3328                 /* transfer dedicated ports to the companion hc */
3329                 if ((temp & PORT_CONNECT) &&
3330                                 test_bit(wIndex, &oxu->companion_ports)) {
3331                         temp &= ~PORT_RWC_BITS;
3332                         temp |= PORT_OWNER;
3333                         writel(temp, status_reg);
3334                         oxu_dbg(oxu, "port %d --> companion\n", wIndex + 1);
3335                         temp = readl(status_reg);
3336                 }
3337 
3338                 /*
3339                  * Even if OWNER is set, there's no harm letting hub_wq
3340                  * see the wPortStatus values (they should all be 0 except
3341                  * for PORT_POWER anyway).
3342                  */
3343 
3344                 if (temp & PORT_CONNECT) {
3345                         status |= USB_PORT_STAT_CONNECTION;
3346                         /* status may be from integrated TT */
3347                         status |= oxu_port_speed(oxu, temp);
3348                 }
3349                 if (temp & PORT_PE)
3350                         status |= USB_PORT_STAT_ENABLE;
3351                 if (temp & (PORT_SUSPEND|PORT_RESUME))
3352                         status |= USB_PORT_STAT_SUSPEND;
3353                 if (temp & PORT_OC)
3354                         status |= USB_PORT_STAT_OVERCURRENT;
3355                 if (temp & PORT_RESET)
3356                         status |= USB_PORT_STAT_RESET;
3357                 if (temp & PORT_POWER)
3358                         status |= USB_PORT_STAT_POWER;
3359 
3360 #ifndef OXU_VERBOSE_DEBUG
3361         if (status & ~0xffff)   /* only if wPortChange is interesting */
3362 #endif
3363                 dbg_port(oxu, "GetStatus", wIndex + 1, temp);
3364                 put_unaligned(cpu_to_le32(status), (__le32 *) buf);
3365                 break;
3366         case SetHubFeature:
3367                 switch (wValue) {
3368                 case C_HUB_LOCAL_POWER:
3369                 case C_HUB_OVER_CURRENT:
3370                         /* no hub-wide feature/status flags */
3371                         break;
3372                 default:
3373                         goto error;
3374                 }
3375                 break;
3376         case SetPortFeature:
3377                 selector = wIndex >> 8;
3378                 wIndex &= 0xff;
3379                 if (!wIndex || wIndex > ports)
3380                         goto error;
3381                 wIndex--;
3382                 temp = readl(status_reg);
3383                 if (temp & PORT_OWNER)
3384                         break;
3385 
3386                 temp &= ~PORT_RWC_BITS;
3387                 switch (wValue) {
3388                 case USB_PORT_FEAT_SUSPEND:
3389                         if ((temp & PORT_PE) == 0
3390                                         || (temp & PORT_RESET) != 0)
3391                                 goto error;
3392                         if (device_may_wakeup(&hcd->self.root_hub->dev))
3393                                 temp |= PORT_WAKE_BITS;
3394                         writel(temp | PORT_SUSPEND, status_reg);
3395                         break;
3396                 case USB_PORT_FEAT_POWER:
3397                         if (HCS_PPC(oxu->hcs_params))
3398                                 writel(temp | PORT_POWER, status_reg);
3399                         break;
3400                 case USB_PORT_FEAT_RESET:
3401                         if (temp & PORT_RESUME)
3402                                 goto error;
3403                         /* line status bits may report this as low speed,
3404                          * which can be fine if this root hub has a
3405                          * transaction translator built in.
3406                          */
3407                         oxu_vdbg(oxu, "port %d reset\n", wIndex + 1);
3408                         temp |= PORT_RESET;
3409                         temp &= ~PORT_PE;
3410 
3411                         /*
3412                          * caller must wait, then call GetPortStatus
3413                          * usb 2.0 spec says 50 ms resets on root
3414                          */
3415                         oxu->reset_done[wIndex] = jiffies
3416                                         + msecs_to_jiffies(50);
3417                         writel(temp, status_reg);
3418                         break;
3419 
3420                 /* For downstream facing ports (these):  one hub port is put
3421                  * into test mode according to USB2 11.24.2.13, then the hub
3422                  * must be reset (which for root hub now means rmmod+modprobe,
3423                  * or else system reboot).  See EHCI 2.3.9 and 4.14 for info
3424                  * about the EHCI-specific stuff.
3425                  */
3426                 case USB_PORT_FEAT_TEST:
3427                         if (!selector || selector > 5)
3428                                 goto error;
3429                         ehci_quiesce(oxu);
3430                         ehci_halt(oxu);
3431                         temp |= selector << 16;
3432                         writel(temp, status_reg);
3433                         break;
3434 
3435                 default:
3436                         goto error;
3437                 }
3438                 readl(&oxu->regs->command);     /* unblock posted writes */
3439                 break;
3440 
3441         default:
3442 error:
3443                 /* "stall" on error */
3444                 retval = -EPIPE;
3445         }
3446         spin_unlock_irqrestore(&oxu->lock, flags);
3447         return retval;
3448 }
3449 
3450 #ifdef CONFIG_PM
3451 
3452 static int oxu_bus_suspend(struct usb_hcd *hcd)
3453 {
3454         struct oxu_hcd *oxu = hcd_to_oxu(hcd);
3455         int port;
3456         int mask;
3457 
3458         oxu_dbg(oxu, "suspend root hub\n");
3459 
3460         if (time_before(jiffies, oxu->next_statechange))
3461                 msleep(5);
3462 
3463         port = HCS_N_PORTS(oxu->hcs_params);
3464         spin_lock_irq(&oxu->lock);
3465 
3466         /* stop schedules, clean any completed work */
3467         if (HC_IS_RUNNING(hcd->state)) {
3468                 ehci_quiesce(oxu);
3469                 hcd->state = HC_STATE_QUIESCING;
3470         }
3471         oxu->command = readl(&oxu->regs->command);
3472         if (oxu->reclaim)
3473                 oxu->reclaim_ready = 1;
3474         ehci_work(oxu);
3475 
3476         /* Unlike other USB host controller types, EHCI doesn't have
3477          * any notion of "global" or bus-wide suspend.  The driver has
3478          * to manually suspend all the active unsuspended ports, and
3479          * then manually resume them in the bus_resume() routine.
3480          */
3481         oxu->bus_suspended = 0;
3482         while (port--) {
3483                 u32 __iomem *reg = &oxu->regs->port_status[port];
3484                 u32 t1 = readl(reg) & ~PORT_RWC_BITS;
3485                 u32 t2 = t1;
3486 
3487                 /* keep track of which ports we suspend */
3488                 if ((t1 & PORT_PE) && !(t1 & PORT_OWNER) &&
3489                                 !(t1 & PORT_SUSPEND)) {
3490                         t2 |= PORT_SUSPEND;
3491                         set_bit(port, &oxu->bus_suspended);
3492                 }
3493 
3494                 /* enable remote wakeup on all ports */
3495                 if (device_may_wakeup(&hcd->self.root_hub->dev))
3496                         t2 |= PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E;
3497                 else
3498                         t2 &= ~(PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E);
3499 
3500                 if (t1 != t2) {
3501                         oxu_vdbg(oxu, "port %d, %08x -> %08x\n",
3502                                 port + 1, t1, t2);
3503                         writel(t2, reg);
3504                 }
3505         }
3506 
3507         /* turn off now-idle HC */
3508         del_timer_sync(&oxu->watchdog);
3509         ehci_halt(oxu);
3510         hcd->state = HC_STATE_SUSPENDED;
3511 
3512         /* allow remote wakeup */
3513         mask = INTR_MASK;
3514         if (!device_may_wakeup(&hcd->self.root_hub->dev))
3515                 mask &= ~STS_PCD;
3516         writel(mask, &oxu->regs->intr_enable);
3517         readl(&oxu->regs->intr_enable);
3518 
3519         oxu->next_statechange = jiffies + msecs_to_jiffies(10);
3520         spin_unlock_irq(&oxu->lock);
3521         return 0;
3522 }
3523 
3524 /* Caller has locked the root hub, and should reset/reinit on error */
3525 static int oxu_bus_resume(struct usb_hcd *hcd)
3526 {
3527         struct oxu_hcd *oxu = hcd_to_oxu(hcd);
3528         u32 temp;
3529         int i;
3530 
3531         if (time_before(jiffies, oxu->next_statechange))
3532                 msleep(5);
3533         spin_lock_irq(&oxu->lock);
3534 
3535         /* Ideally and we've got a real resume here, and no port's power
3536          * was lost.  (For PCI, that means Vaux was maintained.)  But we
3537          * could instead be restoring a swsusp snapshot -- so that BIOS was
3538          * the last user of the controller, not reset/pm hardware keeping
3539          * state we gave to it.
3540          */
3541         temp = readl(&oxu->regs->intr_enable);
3542         oxu_dbg(oxu, "resume root hub%s\n", temp ? "" : " after power loss");
3543 
3544         /* at least some APM implementations will try to deliver
3545          * IRQs right away, so delay them until we're ready.
3546          */
3547         writel(0, &oxu->regs->intr_enable);
3548 
3549         /* re-init operational registers */
3550         writel(0, &oxu->regs->segment);
3551         writel(oxu->periodic_dma, &oxu->regs->frame_list);
3552         writel((u32) oxu->async->qh_dma, &oxu->regs->async_next);
3553 
3554         /* restore CMD_RUN, framelist size, and irq threshold */
3555         writel(oxu->command, &oxu->regs->command);
3556 
3557         /* Some controller/firmware combinations need a delay during which
3558          * they set up the port statuses.  See Bugzilla #8190. */
3559         mdelay(8);
3560 
3561         /* manually resume the ports we suspended during bus_suspend() */
3562         i = HCS_N_PORTS(oxu->hcs_params);
3563         while (i--) {
3564                 temp = readl(&oxu->regs->port_status[i]);
3565                 temp &= ~(PORT_RWC_BITS
3566                         | PORT_WKOC_E | PORT_WKDISC_E | PORT_WKCONN_E);
3567                 if (test_bit(i, &oxu->bus_suspended) && (temp & PORT_SUSPEND)) {
3568                         oxu->reset_done[i] = jiffies + msecs_to_jiffies(20);
3569                         temp |= PORT_RESUME;
3570                 }
3571                 writel(temp, &oxu->regs->port_status[i]);
3572         }
3573         i = HCS_N_PORTS(oxu->hcs_params);
3574         mdelay(20);
3575         while (i--) {
3576                 temp = readl(&oxu->regs->port_status[i]);
3577                 if (test_bit(i, &oxu->bus_suspended) && (temp & PORT_SUSPEND)) {
3578                         temp &= ~(PORT_RWC_BITS | PORT_RESUME);
3579                         writel(temp, &oxu->regs->port_status[i]);
3580                         oxu_vdbg(oxu, "resumed port %d\n", i + 1);
3581                 }
3582         }
3583         (void) readl(&oxu->regs->command);
3584 
3585         /* maybe re-activate the schedule(s) */
3586         temp = 0;
3587         if (oxu->async->qh_next.qh)
3588                 temp |= CMD_ASE;
3589         if (oxu->periodic_sched)
3590                 temp |= CMD_PSE;
3591         if (temp) {
3592                 oxu->command |= temp;
3593                 writel(oxu->command, &oxu->regs->command);
3594         }
3595 
3596         oxu->next_statechange = jiffies + msecs_to_jiffies(5);
3597         hcd->state = HC_STATE_RUNNING;
3598 
3599         /* Now we can safely re-enable irqs */
3600         writel(INTR_MASK, &oxu->regs->intr_enable);
3601 
3602         spin_unlock_irq(&oxu->lock);
3603         return 0;
3604 }
3605 
3606 #else
3607 
3608 static int oxu_bus_suspend(struct usb_hcd *hcd)
3609 {
3610         return 0;
3611 }
3612 
3613 static int oxu_bus_resume(struct usb_hcd *hcd)
3614 {
3615         return 0;
3616 }
3617 
3618 #endif  /* CONFIG_PM */
3619 
3620 static const struct hc_driver oxu_hc_driver = {
3621         .description =          "oxu210hp_hcd",
3622         .product_desc =         "oxu210hp HCD",
3623         .hcd_priv_size =        sizeof(struct oxu_hcd),
3624 
3625         /*
3626          * Generic hardware linkage
3627          */
3628         .irq =                  oxu_irq,
3629         .flags =                HCD_MEMORY | HCD_USB2,
3630 
3631         /*
3632          * Basic lifecycle operations
3633          */
3634         .reset =                oxu_reset,
3635         .start =                oxu_run,
3636         .stop =                 oxu_stop,
3637         .shutdown =             oxu_shutdown,
3638 
3639         /*
3640          * Managing i/o requests and associated device resources
3641          */
3642         .urb_enqueue =          oxu_urb_enqueue,
3643         .urb_dequeue =          oxu_urb_dequeue,
3644         .endpoint_disable =     oxu_endpoint_disable,
3645 
3646         /*
3647          * Scheduling support
3648          */
3649         .get_frame_number =     oxu_get_frame,
3650 
3651         /*
3652          * Root hub support
3653          */
3654         .hub_status_data =      oxu_hub_status_data,
3655         .hub_control =          oxu_hub_control,
3656         .bus_suspend =          oxu_bus_suspend,
3657         .bus_resume =           oxu_bus_resume,
3658 };
3659 
3660 /*
3661  * Module stuff
3662  */
3663 
3664 static void oxu_configuration(struct platform_device *pdev, void *base)
3665 {
3666         u32 tmp;
3667 
3668         /* Initialize top level registers.
3669          * First write ever
3670          */
3671         oxu_writel(base, OXU_HOSTIFCONFIG, 0x0000037D);
3672         oxu_writel(base, OXU_SOFTRESET, OXU_SRESET);
3673         oxu_writel(base, OXU_HOSTIFCONFIG, 0x0000037D);
3674 
3675         tmp = oxu_readl(base, OXU_PIOBURSTREADCTRL);
3676         oxu_writel(base, OXU_PIOBURSTREADCTRL, tmp | 0x0040);
3677 
3678         oxu_writel(base, OXU_ASO, OXU_SPHPOEN | OXU_OVRCCURPUPDEN |
3679                                         OXU_COMPARATOR | OXU_ASO_OP);
3680 
3681         tmp = oxu_readl(base, OXU_CLKCTRL_SET);
3682         oxu_writel(base, OXU_CLKCTRL_SET, tmp | OXU_SYSCLKEN | OXU_USBOTGCLKEN);
3683 
3684         /* Clear all top interrupt enable */
3685         oxu_writel(base, OXU_CHIPIRQEN_CLR, 0xff);
3686 
3687         /* Clear all top interrupt status */
3688         oxu_writel(base, OXU_CHIPIRQSTATUS, 0xff);
3689 
3690         /* Enable all needed top interrupt except OTG SPH core */
3691         oxu_writel(base, OXU_CHIPIRQEN_SET, OXU_USBSPHLPWUI | OXU_USBOTGLPWUI);
3692 }
3693 
3694 static int oxu_verify_id(struct platform_device *pdev, void *base)
3695 {
3696         u32 id;
3697         static const char * const bo[] = {
3698                 "reserved",
3699                 "128-pin LQFP",
3700                 "84-pin TFBGA",
3701                 "reserved",
3702         };
3703 
3704         /* Read controller signature register to find a match */
3705         id = oxu_readl(base, OXU_DEVICEID);
3706         dev_info(&pdev->dev, "device ID %x\n", id);
3707         if ((id & OXU_REV_MASK) != (OXU_REV_2100 << OXU_REV_SHIFT))
3708                 return -1;
3709 
3710         dev_info(&pdev->dev, "found device %x %s (%04x:%04x)\n",
3711                 id >> OXU_REV_SHIFT,
3712                 bo[(id & OXU_BO_MASK) >> OXU_BO_SHIFT],
3713                 (id & OXU_MAJ_REV_MASK) >> OXU_MAJ_REV_SHIFT,
3714                 (id & OXU_MIN_REV_MASK) >> OXU_MIN_REV_SHIFT);
3715 
3716         return 0;
3717 }
3718 
3719 static const struct hc_driver oxu_hc_driver;
3720 static struct usb_hcd *oxu_create(struct platform_device *pdev,
3721                                 unsigned long memstart, unsigned long memlen,
3722                                 void *base, int irq, int otg)
3723 {
3724         struct device *dev = &pdev->dev;
3725 
3726         struct usb_hcd *hcd;
3727         struct oxu_hcd *oxu;
3728         int ret;
3729 
3730         /* Set endian mode and host mode */
3731         oxu_writel(base + (otg ? OXU_OTG_CORE_OFFSET : OXU_SPH_CORE_OFFSET),
3732                                 OXU_USBMODE,
3733                                 OXU_CM_HOST_ONLY | OXU_ES_LITTLE | OXU_VBPS);
3734 
3735         hcd = usb_create_hcd(&oxu_hc_driver, dev,
3736                                 otg ? "oxu210hp_otg" : "oxu210hp_sph");
3737         if (!hcd)
3738                 return ERR_PTR(-ENOMEM);
3739 
3740         hcd->rsrc_start = memstart;
3741         hcd->rsrc_len = memlen;
3742         hcd->regs = base;
3743         hcd->irq = irq;
3744         hcd->state = HC_STATE_HALT;
3745 
3746         oxu = hcd_to_oxu(hcd);
3747         oxu->is_otg = otg;
3748 
3749         ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
3750         if (ret < 0)
3751                 return ERR_PTR(ret);
3752 
3753         device_wakeup_enable(hcd->self.controller);
3754         return hcd;
3755 }
3756 
3757 static int oxu_init(struct platform_device *pdev,
3758                                 unsigned long memstart, unsigned long memlen,
3759                                 void *base, int irq)
3760 {
3761         struct oxu_info *info = platform_get_drvdata(pdev);
3762         struct usb_hcd *hcd;
3763         int ret;
3764 
3765         /* First time configuration at start up */
3766         oxu_configuration(pdev, base);
3767 
3768         ret = oxu_verify_id(pdev, base);
3769         if (ret) {
3770                 dev_err(&pdev->dev, "no devices found!\n");
3771                 return -ENODEV;
3772         }
3773 
3774         /* Create the OTG controller */
3775         hcd = oxu_create(pdev, memstart, memlen, base, irq, 1);
3776         if (IS_ERR(hcd)) {
3777                 dev_err(&pdev->dev, "cannot create OTG controller!\n");
3778                 ret = PTR_ERR(hcd);
3779                 goto error_create_otg;
3780         }
3781         info->hcd[0] = hcd;
3782 
3783         /* Create the SPH host controller */
3784         hcd = oxu_create(pdev, memstart, memlen, base, irq, 0);
3785         if (IS_ERR(hcd)) {
3786                 dev_err(&pdev->dev, "cannot create SPH controller!\n");
3787                 ret = PTR_ERR(hcd);
3788                 goto error_create_sph;
3789         }
3790         info->hcd[1] = hcd;
3791 
3792         oxu_writel(base, OXU_CHIPIRQEN_SET,
3793                 oxu_readl(base, OXU_CHIPIRQEN_SET) | 3);
3794 
3795         return 0;
3796 
3797 error_create_sph:
3798         usb_remove_hcd(info->hcd[0]);
3799         usb_put_hcd(info->hcd[0]);
3800 
3801 error_create_otg:
3802         return ret;
3803 }
3804 
3805 static int oxu_drv_probe(struct platform_device *pdev)
3806 {
3807         struct resource *res;
3808         void *base;
3809         unsigned long memstart, memlen;
3810         int irq, ret;
3811         struct oxu_info *info;
3812 
3813         if (usb_disabled())
3814                 return -ENODEV;
3815 
3816         /*
3817          * Get the platform resources
3818          */
3819         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
3820         if (!res) {
3821                 dev_err(&pdev->dev,
3822                         "no IRQ! Check %s setup!\n", dev_name(&pdev->dev));
3823                 return -ENODEV;
3824         }
3825         irq = res->start;
3826         dev_dbg(&pdev->dev, "IRQ resource %d\n", irq);
3827 
3828         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
3829         base = devm_ioremap_resource(&pdev->dev, res);
3830         if (IS_ERR(base)) {
3831                 ret = PTR_ERR(base);
3832                 goto error;
3833         }
3834         memstart = res->start;
3835         memlen = resource_size(res);
3836 
3837         ret = irq_set_irq_type(irq, IRQF_TRIGGER_FALLING);
3838         if (ret) {
3839                 dev_err(&pdev->dev, "error setting irq type\n");
3840                 ret = -EFAULT;
3841                 goto error;
3842         }
3843 
3844         /* Allocate a driver data struct to hold useful info for both
3845          * SPH & OTG devices
3846          */
3847         info = devm_kzalloc(&pdev->dev, sizeof(struct oxu_info), GFP_KERNEL);
3848         if (!info) {
3849                 dev_dbg(&pdev->dev, "error allocating memory\n");
3850                 ret = -EFAULT;
3851                 goto error;
3852         }
3853         platform_set_drvdata(pdev, info);
3854 
3855         ret = oxu_init(pdev, memstart, memlen, base, irq);
3856         if (ret < 0) {
3857                 dev_dbg(&pdev->dev, "cannot init USB devices\n");
3858                 goto error;
3859         }
3860 
3861         dev_info(&pdev->dev, "devices enabled and running\n");
3862         platform_set_drvdata(pdev, info);
3863 
3864         return 0;
3865 
3866 error:
3867         dev_err(&pdev->dev, "init %s fail, %d\n", dev_name(&pdev->dev), ret);
3868         return ret;
3869 }
3870 
3871 static void oxu_remove(struct platform_device *pdev, struct usb_hcd *hcd)
3872 {
3873         usb_remove_hcd(hcd);
3874         usb_put_hcd(hcd);
3875 }
3876 
3877 static int oxu_drv_remove(struct platform_device *pdev)
3878 {
3879         struct oxu_info *info = platform_get_drvdata(pdev);
3880 
3881         oxu_remove(pdev, info->hcd[0]);
3882         oxu_remove(pdev, info->hcd[1]);
3883 
3884         return 0;
3885 }
3886 
3887 static void oxu_drv_shutdown(struct platform_device *pdev)
3888 {
3889         oxu_drv_remove(pdev);
3890 }
3891 
3892 #if 0
3893 /* FIXME: TODO */
3894 static int oxu_drv_suspend(struct device *dev)
3895 {
3896         struct platform_device *pdev = to_platform_device(dev);
3897         struct usb_hcd *hcd = dev_get_drvdata(dev);
3898 
3899         return 0;
3900 }
3901 
3902 static int oxu_drv_resume(struct device *dev)
3903 {
3904         struct platform_device *pdev = to_platform_device(dev);
3905         struct usb_hcd *hcd = dev_get_drvdata(dev);
3906 
3907         return 0;
3908 }
3909 #else
3910 #define oxu_drv_suspend NULL
3911 #define oxu_drv_resume  NULL
3912 #endif
3913 
3914 static struct platform_driver oxu_driver = {
3915         .probe          = oxu_drv_probe,
3916         .remove         = oxu_drv_remove,
3917         .shutdown       = oxu_drv_shutdown,
3918         .suspend        = oxu_drv_suspend,
3919         .resume         = oxu_drv_resume,
3920         .driver = {
3921                 .name = "oxu210hp-hcd",
3922                 .bus = &platform_bus_type
3923         }
3924 };
3925 
3926 module_platform_driver(oxu_driver);
3927 
3928 MODULE_DESCRIPTION("Oxford OXU210HP HCD driver - ver. " DRIVER_VERSION);
3929 MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
3930 MODULE_LICENSE("GPL");
3931 

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