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usb: xhci: trace URB before giving it back instead of after
[mirror_ubuntu-artful-kernel.git] / drivers / usb / host / ohci-hub.c
1 /*
2 * OHCI HCD (Host Controller Driver) for USB.
3 *
4 * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
5 * (C) Copyright 2000-2004 David Brownell <dbrownell@users.sourceforge.net>
6 *
7 * This file is licenced under GPL
8 */
9
10 /*-------------------------------------------------------------------------*/
11
12 /*
13 * OHCI Root Hub ... the nonsharable stuff
14 */
15
16 #define dbg_port(hc,label,num,value) \
17 ohci_dbg (hc, \
18 "%s roothub.portstatus [%d] " \
19 "= 0x%08x%s%s%s%s%s%s%s%s%s%s%s%s\n", \
20 label, num, value, \
21 (value & RH_PS_PRSC) ? " PRSC" : "", \
22 (value & RH_PS_OCIC) ? " OCIC" : "", \
23 (value & RH_PS_PSSC) ? " PSSC" : "", \
24 (value & RH_PS_PESC) ? " PESC" : "", \
25 (value & RH_PS_CSC) ? " CSC" : "", \
26 \
27 (value & RH_PS_LSDA) ? " LSDA" : "", \
28 (value & RH_PS_PPS) ? " PPS" : "", \
29 (value & RH_PS_PRS) ? " PRS" : "", \
30 (value & RH_PS_POCI) ? " POCI" : "", \
31 (value & RH_PS_PSS) ? " PSS" : "", \
32 \
33 (value & RH_PS_PES) ? " PES" : "", \
34 (value & RH_PS_CCS) ? " CCS" : "" \
35 );
36
37 /*-------------------------------------------------------------------------*/
38
39 #define OHCI_SCHED_ENABLES \
40 (OHCI_CTRL_CLE|OHCI_CTRL_BLE|OHCI_CTRL_PLE|OHCI_CTRL_IE)
41
42 static void update_done_list(struct ohci_hcd *);
43 static void ohci_work(struct ohci_hcd *);
44
45 #ifdef CONFIG_PM
46 static int ohci_rh_suspend (struct ohci_hcd *ohci, int autostop)
47 __releases(ohci->lock)
48 __acquires(ohci->lock)
49 {
50 int status = 0;
51
52 ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
53 switch (ohci->hc_control & OHCI_CTRL_HCFS) {
54 case OHCI_USB_RESUME:
55 ohci_dbg (ohci, "resume/suspend?\n");
56 ohci->hc_control &= ~OHCI_CTRL_HCFS;
57 ohci->hc_control |= OHCI_USB_RESET;
58 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
59 (void) ohci_readl (ohci, &ohci->regs->control);
60 /* FALL THROUGH */
61 case OHCI_USB_RESET:
62 status = -EBUSY;
63 ohci_dbg (ohci, "needs reinit!\n");
64 goto done;
65 case OHCI_USB_SUSPEND:
66 if (!ohci->autostop) {
67 ohci_dbg (ohci, "already suspended\n");
68 goto done;
69 }
70 }
71 ohci_dbg (ohci, "%s root hub\n",
72 autostop ? "auto-stop" : "suspend");
73
74 /* First stop any processing */
75 if (!autostop && (ohci->hc_control & OHCI_SCHED_ENABLES)) {
76 ohci->hc_control &= ~OHCI_SCHED_ENABLES;
77 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
78 ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
79 ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrstatus);
80
81 /* sched disables take effect on the next frame,
82 * then the last WDH could take 6+ msec
83 */
84 ohci_dbg (ohci, "stopping schedules ...\n");
85 ohci->autostop = 0;
86 spin_unlock_irq (&ohci->lock);
87 msleep (8);
88 spin_lock_irq (&ohci->lock);
89 }
90 update_done_list(ohci);
91 ohci_work(ohci);
92
93 /*
94 * Some controllers don't handle "global" suspend properly if
95 * there are unsuspended ports. For these controllers, put all
96 * the enabled ports into suspend before suspending the root hub.
97 */
98 if (ohci->flags & OHCI_QUIRK_GLOBAL_SUSPEND) {
99 __hc32 __iomem *portstat = ohci->regs->roothub.portstatus;
100 int i;
101 unsigned temp;
102
103 for (i = 0; i < ohci->num_ports; (++i, ++portstat)) {
104 temp = ohci_readl(ohci, portstat);
105 if ((temp & (RH_PS_PES | RH_PS_PSS)) ==
106 RH_PS_PES)
107 ohci_writel(ohci, RH_PS_PSS, portstat);
108 }
109 }
110
111 /* maybe resume can wake root hub */
112 if (ohci_to_hcd(ohci)->self.root_hub->do_remote_wakeup || autostop) {
113 ohci->hc_control |= OHCI_CTRL_RWE;
114 } else {
115 ohci_writel(ohci, OHCI_INTR_RHSC | OHCI_INTR_RD,
116 &ohci->regs->intrdisable);
117 ohci->hc_control &= ~OHCI_CTRL_RWE;
118 }
119
120 /* Suspend hub ... this is the "global (to this bus) suspend" mode,
121 * which doesn't imply ports will first be individually suspended.
122 */
123 ohci->hc_control &= ~OHCI_CTRL_HCFS;
124 ohci->hc_control |= OHCI_USB_SUSPEND;
125 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
126 (void) ohci_readl (ohci, &ohci->regs->control);
127
128 /* no resumes until devices finish suspending */
129 if (!autostop) {
130 ohci->next_statechange = jiffies + msecs_to_jiffies (5);
131 ohci->autostop = 0;
132 ohci->rh_state = OHCI_RH_SUSPENDED;
133 }
134
135 done:
136 return status;
137 }
138
139 static inline struct ed *find_head (struct ed *ed)
140 {
141 /* for bulk and control lists */
142 while (ed->ed_prev)
143 ed = ed->ed_prev;
144 return ed;
145 }
146
147 /* caller has locked the root hub */
148 static int ohci_rh_resume (struct ohci_hcd *ohci)
149 __releases(ohci->lock)
150 __acquires(ohci->lock)
151 {
152 struct usb_hcd *hcd = ohci_to_hcd (ohci);
153 u32 temp, enables;
154 int status = -EINPROGRESS;
155 int autostopped = ohci->autostop;
156
157 ohci->autostop = 0;
158 ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
159
160 if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) {
161 /* this can happen after resuming a swsusp snapshot */
162 if (ohci->rh_state != OHCI_RH_RUNNING) {
163 ohci_dbg (ohci, "BIOS/SMM active, control %03x\n",
164 ohci->hc_control);
165 status = -EBUSY;
166 /* this happens when pmcore resumes HC then root */
167 } else {
168 ohci_dbg (ohci, "duplicate resume\n");
169 status = 0;
170 }
171 } else switch (ohci->hc_control & OHCI_CTRL_HCFS) {
172 case OHCI_USB_SUSPEND:
173 ohci->hc_control &= ~(OHCI_CTRL_HCFS|OHCI_SCHED_ENABLES);
174 ohci->hc_control |= OHCI_USB_RESUME;
175 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
176 (void) ohci_readl (ohci, &ohci->regs->control);
177 ohci_dbg (ohci, "%s root hub\n",
178 autostopped ? "auto-start" : "resume");
179 break;
180 case OHCI_USB_RESUME:
181 /* HCFS changes sometime after INTR_RD */
182 ohci_dbg(ohci, "%swakeup root hub\n",
183 autostopped ? "auto-" : "");
184 break;
185 case OHCI_USB_OPER:
186 /* this can happen after resuming a swsusp snapshot */
187 ohci_dbg (ohci, "snapshot resume? reinit\n");
188 status = -EBUSY;
189 break;
190 default: /* RESET, we lost power */
191 ohci_dbg (ohci, "lost power\n");
192 status = -EBUSY;
193 }
194 if (status == -EBUSY) {
195 if (!autostopped) {
196 spin_unlock_irq (&ohci->lock);
197 status = ohci_restart (ohci);
198
199 usb_root_hub_lost_power(hcd->self.root_hub);
200
201 spin_lock_irq (&ohci->lock);
202 }
203 return status;
204 }
205 if (status != -EINPROGRESS)
206 return status;
207 if (autostopped)
208 goto skip_resume;
209 spin_unlock_irq (&ohci->lock);
210
211 /* Some controllers (lucent erratum) need extra-long delays */
212 msleep (20 /* usb 11.5.1.10 */ + 12 /* 32 msec counter */ + 1);
213
214 temp = ohci_readl (ohci, &ohci->regs->control);
215 temp &= OHCI_CTRL_HCFS;
216 if (temp != OHCI_USB_RESUME) {
217 ohci_err (ohci, "controller won't resume\n");
218 spin_lock_irq(&ohci->lock);
219 return -EBUSY;
220 }
221
222 /* disable old schedule state, reinit from scratch */
223 ohci_writel (ohci, 0, &ohci->regs->ed_controlhead);
224 ohci_writel (ohci, 0, &ohci->regs->ed_controlcurrent);
225 ohci_writel (ohci, 0, &ohci->regs->ed_bulkhead);
226 ohci_writel (ohci, 0, &ohci->regs->ed_bulkcurrent);
227 ohci_writel (ohci, 0, &ohci->regs->ed_periodcurrent);
228 ohci_writel (ohci, (u32) ohci->hcca_dma, &ohci->regs->hcca);
229
230 /* Sometimes PCI D3 suspend trashes frame timings ... */
231 periodic_reinit (ohci);
232
233 /*
234 * The following code is executed with ohci->lock held and
235 * irqs disabled if and only if autostopped is true. This
236 * will cause sparse to warn about a "context imbalance".
237 */
238 skip_resume:
239 /* interrupts might have been disabled */
240 ohci_writel (ohci, OHCI_INTR_INIT, &ohci->regs->intrenable);
241 if (ohci->ed_rm_list)
242 ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrenable);
243
244 /* Then re-enable operations */
245 ohci_writel (ohci, OHCI_USB_OPER, &ohci->regs->control);
246 (void) ohci_readl (ohci, &ohci->regs->control);
247 if (!autostopped)
248 msleep (3);
249
250 temp = ohci->hc_control;
251 temp &= OHCI_CTRL_RWC;
252 temp |= OHCI_CONTROL_INIT | OHCI_USB_OPER;
253 ohci->hc_control = temp;
254 ohci_writel (ohci, temp, &ohci->regs->control);
255 (void) ohci_readl (ohci, &ohci->regs->control);
256
257 /* TRSMRCY */
258 if (!autostopped) {
259 msleep (10);
260 spin_lock_irq (&ohci->lock);
261 }
262 /* now ohci->lock is always held and irqs are always disabled */
263
264 /* keep it alive for more than ~5x suspend + resume costs */
265 ohci->next_statechange = jiffies + STATECHANGE_DELAY;
266
267 /* maybe turn schedules back on */
268 enables = 0;
269 temp = 0;
270 if (!ohci->ed_rm_list) {
271 if (ohci->ed_controltail) {
272 ohci_writel (ohci,
273 find_head (ohci->ed_controltail)->dma,
274 &ohci->regs->ed_controlhead);
275 enables |= OHCI_CTRL_CLE;
276 temp |= OHCI_CLF;
277 }
278 if (ohci->ed_bulktail) {
279 ohci_writel (ohci, find_head (ohci->ed_bulktail)->dma,
280 &ohci->regs->ed_bulkhead);
281 enables |= OHCI_CTRL_BLE;
282 temp |= OHCI_BLF;
283 }
284 }
285 if (hcd->self.bandwidth_isoc_reqs || hcd->self.bandwidth_int_reqs)
286 enables |= OHCI_CTRL_PLE|OHCI_CTRL_IE;
287 if (enables) {
288 ohci_dbg (ohci, "restarting schedules ... %08x\n", enables);
289 ohci->hc_control |= enables;
290 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
291 if (temp)
292 ohci_writel (ohci, temp, &ohci->regs->cmdstatus);
293 (void) ohci_readl (ohci, &ohci->regs->control);
294 }
295
296 ohci->rh_state = OHCI_RH_RUNNING;
297 return 0;
298 }
299
300 static int ohci_bus_suspend (struct usb_hcd *hcd)
301 {
302 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
303 int rc;
304
305 spin_lock_irq (&ohci->lock);
306
307 if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
308 rc = -ESHUTDOWN;
309 else
310 rc = ohci_rh_suspend (ohci, 0);
311 spin_unlock_irq (&ohci->lock);
312
313 if (rc == 0)
314 del_timer_sync(&ohci->io_watchdog);
315 return rc;
316 }
317
318 static int ohci_bus_resume (struct usb_hcd *hcd)
319 {
320 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
321 int rc;
322
323 if (time_before (jiffies, ohci->next_statechange))
324 msleep(5);
325
326 spin_lock_irq (&ohci->lock);
327
328 if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
329 rc = -ESHUTDOWN;
330 else
331 rc = ohci_rh_resume (ohci);
332 spin_unlock_irq (&ohci->lock);
333
334 /* poll until we know a device is connected or we autostop */
335 if (rc == 0)
336 usb_hcd_poll_rh_status(hcd);
337 return rc;
338 }
339
340 /* Carry out polling-, autostop-, and autoresume-related state changes */
341 static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
342 int any_connected, int rhsc_status)
343 {
344 int poll_rh = 1;
345 int rhsc_enable;
346
347 /* Some broken controllers never turn off RHSC in the interrupt
348 * status register. For their sake we won't re-enable RHSC
349 * interrupts if the interrupt bit is already active.
350 */
351 rhsc_enable = ohci_readl(ohci, &ohci->regs->intrenable) &
352 OHCI_INTR_RHSC;
353
354 switch (ohci->hc_control & OHCI_CTRL_HCFS) {
355 case OHCI_USB_OPER:
356 /* If no status changes are pending, enable RHSC interrupts. */
357 if (!rhsc_enable && !rhsc_status && !changed) {
358 rhsc_enable = OHCI_INTR_RHSC;
359 ohci_writel(ohci, rhsc_enable, &ohci->regs->intrenable);
360 }
361
362 /* Keep on polling until we know a device is connected
363 * and RHSC is enabled, or until we autostop.
364 */
365 if (!ohci->autostop) {
366 if (any_connected ||
367 !device_may_wakeup(&ohci_to_hcd(ohci)
368 ->self.root_hub->dev)) {
369 if (rhsc_enable)
370 poll_rh = 0;
371 } else {
372 ohci->autostop = 1;
373 ohci->next_statechange = jiffies + HZ;
374 }
375
376 /* if no devices have been attached for one second, autostop */
377 } else {
378 if (changed || any_connected) {
379 ohci->autostop = 0;
380 ohci->next_statechange = jiffies +
381 STATECHANGE_DELAY;
382 } else if (time_after_eq(jiffies,
383 ohci->next_statechange)
384 && !ohci->ed_rm_list
385 && !(ohci->hc_control &
386 OHCI_SCHED_ENABLES)) {
387 ohci_rh_suspend(ohci, 1);
388 if (rhsc_enable)
389 poll_rh = 0;
390 }
391 }
392 break;
393
394 case OHCI_USB_SUSPEND:
395 case OHCI_USB_RESUME:
396 /* if there is a port change, autostart or ask to be resumed */
397 if (changed) {
398 if (ohci->autostop)
399 ohci_rh_resume(ohci);
400 else
401 usb_hcd_resume_root_hub(ohci_to_hcd(ohci));
402
403 /* If remote wakeup is disabled, stop polling */
404 } else if (!ohci->autostop &&
405 !ohci_to_hcd(ohci)->self.root_hub->
406 do_remote_wakeup) {
407 poll_rh = 0;
408
409 } else {
410 /* If no status changes are pending,
411 * enable RHSC interrupts
412 */
413 if (!rhsc_enable && !rhsc_status) {
414 rhsc_enable = OHCI_INTR_RHSC;
415 ohci_writel(ohci, rhsc_enable,
416 &ohci->regs->intrenable);
417 }
418 /* Keep polling until RHSC is enabled */
419 if (rhsc_enable)
420 poll_rh = 0;
421 }
422 break;
423 }
424 return poll_rh;
425 }
426
427 #else /* CONFIG_PM */
428
429 static inline int ohci_rh_resume(struct ohci_hcd *ohci)
430 {
431 return 0;
432 }
433
434 /* Carry out polling-related state changes.
435 * autostop isn't used when CONFIG_PM is turned off.
436 */
437 static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
438 int any_connected, int rhsc_status)
439 {
440 /* If RHSC is enabled, don't poll */
441 if (ohci_readl(ohci, &ohci->regs->intrenable) & OHCI_INTR_RHSC)
442 return 0;
443
444 /* If status changes are pending, continue polling.
445 * Conversely, if no status changes are pending but the RHSC
446 * status bit was set, then RHSC may be broken so continue polling.
447 */
448 if (changed || rhsc_status)
449 return 1;
450
451 /* It's safe to re-enable RHSC interrupts */
452 ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrenable);
453 return 0;
454 }
455
456 #endif /* CONFIG_PM */
457
458 /*-------------------------------------------------------------------------*/
459
460 /* build "status change" packet (one or two bytes) from HC registers */
461
462 int ohci_hub_status_data(struct usb_hcd *hcd, char *buf)
463 {
464 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
465 int i, changed = 0, length = 1;
466 int any_connected = 0;
467 int rhsc_status;
468 unsigned long flags;
469
470 spin_lock_irqsave (&ohci->lock, flags);
471 if (!HCD_HW_ACCESSIBLE(hcd))
472 goto done;
473
474 /* undocumented erratum seen on at least rev D */
475 if ((ohci->flags & OHCI_QUIRK_AMD756)
476 && (roothub_a (ohci) & RH_A_NDP) > MAX_ROOT_PORTS) {
477 ohci_warn (ohci, "bogus NDP, rereads as NDP=%d\n",
478 ohci_readl (ohci, &ohci->regs->roothub.a) & RH_A_NDP);
479 /* retry later; "should not happen" */
480 goto done;
481 }
482
483 /* init status */
484 if (roothub_status (ohci) & (RH_HS_LPSC | RH_HS_OCIC))
485 buf [0] = changed = 1;
486 else
487 buf [0] = 0;
488 if (ohci->num_ports > 7) {
489 buf [1] = 0;
490 length++;
491 }
492
493 /* Clear the RHSC status flag before reading the port statuses */
494 ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrstatus);
495 rhsc_status = ohci_readl(ohci, &ohci->regs->intrstatus) &
496 OHCI_INTR_RHSC;
497
498 /* look at each port */
499 for (i = 0; i < ohci->num_ports; i++) {
500 u32 status = roothub_portstatus (ohci, i);
501
502 /* can't autostop if ports are connected */
503 any_connected |= (status & RH_PS_CCS);
504
505 if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC
506 | RH_PS_OCIC | RH_PS_PRSC)) {
507 changed = 1;
508 if (i < 7)
509 buf [0] |= 1 << (i + 1);
510 else
511 buf [1] |= 1 << (i - 7);
512 }
513 }
514
515 if (ohci_root_hub_state_changes(ohci, changed,
516 any_connected, rhsc_status))
517 set_bit(HCD_FLAG_POLL_RH, &hcd->flags);
518 else
519 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
520
521
522 done:
523 spin_unlock_irqrestore (&ohci->lock, flags);
524
525 return changed ? length : 0;
526 }
527 EXPORT_SYMBOL_GPL(ohci_hub_status_data);
528
529 /*-------------------------------------------------------------------------*/
530
531 static void
532 ohci_hub_descriptor (
533 struct ohci_hcd *ohci,
534 struct usb_hub_descriptor *desc
535 ) {
536 u32 rh = roothub_a (ohci);
537 u16 temp;
538
539 desc->bDescriptorType = USB_DT_HUB;
540 desc->bPwrOn2PwrGood = (rh & RH_A_POTPGT) >> 24;
541 desc->bHubContrCurrent = 0;
542
543 desc->bNbrPorts = ohci->num_ports;
544 temp = 1 + (ohci->num_ports / 8);
545 desc->bDescLength = 7 + 2 * temp;
546
547 temp = HUB_CHAR_COMMON_LPSM | HUB_CHAR_COMMON_OCPM;
548 if (rh & RH_A_NPS) /* no power switching? */
549 temp |= HUB_CHAR_NO_LPSM;
550 if (rh & RH_A_PSM) /* per-port power switching? */
551 temp |= HUB_CHAR_INDV_PORT_LPSM;
552 if (rh & RH_A_NOCP) /* no overcurrent reporting? */
553 temp |= HUB_CHAR_NO_OCPM;
554 else if (rh & RH_A_OCPM) /* per-port overcurrent reporting? */
555 temp |= HUB_CHAR_INDV_PORT_OCPM;
556 desc->wHubCharacteristics = cpu_to_le16(temp);
557
558 /* ports removable, and usb 1.0 legacy PortPwrCtrlMask */
559 rh = roothub_b (ohci);
560 memset(desc->u.hs.DeviceRemovable, 0xff,
561 sizeof(desc->u.hs.DeviceRemovable));
562 desc->u.hs.DeviceRemovable[0] = rh & RH_B_DR;
563 if (ohci->num_ports > 7) {
564 desc->u.hs.DeviceRemovable[1] = (rh & RH_B_DR) >> 8;
565 desc->u.hs.DeviceRemovable[2] = 0xff;
566 } else
567 desc->u.hs.DeviceRemovable[1] = 0xff;
568 }
569
570 /*-------------------------------------------------------------------------*/
571
572 #ifdef CONFIG_USB_OTG
573
574 static int ohci_start_port_reset (struct usb_hcd *hcd, unsigned port)
575 {
576 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
577 u32 status;
578
579 if (!port)
580 return -EINVAL;
581 port--;
582
583 /* start port reset before HNP protocol times out */
584 status = ohci_readl(ohci, &ohci->regs->roothub.portstatus [port]);
585 if (!(status & RH_PS_CCS))
586 return -ENODEV;
587
588 /* hub_wq will finish the reset later */
589 ohci_writel(ohci, RH_PS_PRS, &ohci->regs->roothub.portstatus [port]);
590 return 0;
591 }
592
593 #else
594
595 #define ohci_start_port_reset NULL
596
597 #endif
598
599 /*-------------------------------------------------------------------------*/
600
601
602 /* See usb 7.1.7.5: root hubs must issue at least 50 msec reset signaling,
603 * not necessarily continuous ... to guard against resume signaling.
604 */
605 #define PORT_RESET_MSEC 50
606
607 /* this timer value might be vendor-specific ... */
608 #define PORT_RESET_HW_MSEC 10
609
610 /* wrap-aware logic morphed from <linux/jiffies.h> */
611 #define tick_before(t1,t2) ((s16)(((s16)(t1))-((s16)(t2))) < 0)
612
613 /* called from some task, normally hub_wq */
614 static inline int root_port_reset (struct ohci_hcd *ohci, unsigned port)
615 {
616 __hc32 __iomem *portstat = &ohci->regs->roothub.portstatus [port];
617 u32 temp = 0;
618 u16 now = ohci_readl(ohci, &ohci->regs->fmnumber);
619 u16 reset_done = now + PORT_RESET_MSEC;
620 int limit_1 = DIV_ROUND_UP(PORT_RESET_MSEC, PORT_RESET_HW_MSEC);
621
622 /* build a "continuous enough" reset signal, with up to
623 * 3msec gap between pulses. scheduler HZ==100 must work;
624 * this might need to be deadline-scheduled.
625 */
626 do {
627 int limit_2;
628
629 /* spin until any current reset finishes */
630 limit_2 = PORT_RESET_HW_MSEC * 2;
631 while (--limit_2 >= 0) {
632 temp = ohci_readl (ohci, portstat);
633 /* handle e.g. CardBus eject */
634 if (temp == ~(u32)0)
635 return -ESHUTDOWN;
636 if (!(temp & RH_PS_PRS))
637 break;
638 udelay (500);
639 }
640
641 /* timeout (a hardware error) has been observed when
642 * EHCI sets CF while this driver is resetting a port;
643 * presumably other disconnect paths might do it too.
644 */
645 if (limit_2 < 0) {
646 ohci_dbg(ohci,
647 "port[%d] reset timeout, stat %08x\n",
648 port, temp);
649 break;
650 }
651
652 if (!(temp & RH_PS_CCS))
653 break;
654 if (temp & RH_PS_PRSC)
655 ohci_writel (ohci, RH_PS_PRSC, portstat);
656
657 /* start the next reset, sleep till it's probably done */
658 ohci_writel (ohci, RH_PS_PRS, portstat);
659 msleep(PORT_RESET_HW_MSEC);
660 now = ohci_readl(ohci, &ohci->regs->fmnumber);
661 } while (tick_before(now, reset_done) && --limit_1 >= 0);
662
663 /* caller synchronizes using PRSC ... and handles PRS
664 * still being set when this returns.
665 */
666
667 return 0;
668 }
669
670 int ohci_hub_control(
671 struct usb_hcd *hcd,
672 u16 typeReq,
673 u16 wValue,
674 u16 wIndex,
675 char *buf,
676 u16 wLength
677 ) {
678 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
679 int ports = ohci->num_ports;
680 u32 temp;
681 int retval = 0;
682
683 if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
684 return -ESHUTDOWN;
685
686 switch (typeReq) {
687 case ClearHubFeature:
688 switch (wValue) {
689 case C_HUB_OVER_CURRENT:
690 ohci_writel (ohci, RH_HS_OCIC,
691 &ohci->regs->roothub.status);
692 case C_HUB_LOCAL_POWER:
693 break;
694 default:
695 goto error;
696 }
697 break;
698 case ClearPortFeature:
699 if (!wIndex || wIndex > ports)
700 goto error;
701 wIndex--;
702
703 switch (wValue) {
704 case USB_PORT_FEAT_ENABLE:
705 temp = RH_PS_CCS;
706 break;
707 case USB_PORT_FEAT_C_ENABLE:
708 temp = RH_PS_PESC;
709 break;
710 case USB_PORT_FEAT_SUSPEND:
711 temp = RH_PS_POCI;
712 break;
713 case USB_PORT_FEAT_C_SUSPEND:
714 temp = RH_PS_PSSC;
715 break;
716 case USB_PORT_FEAT_POWER:
717 temp = RH_PS_LSDA;
718 break;
719 case USB_PORT_FEAT_C_CONNECTION:
720 temp = RH_PS_CSC;
721 break;
722 case USB_PORT_FEAT_C_OVER_CURRENT:
723 temp = RH_PS_OCIC;
724 break;
725 case USB_PORT_FEAT_C_RESET:
726 temp = RH_PS_PRSC;
727 break;
728 default:
729 goto error;
730 }
731 ohci_writel (ohci, temp,
732 &ohci->regs->roothub.portstatus [wIndex]);
733 // ohci_readl (ohci, &ohci->regs->roothub.portstatus [wIndex]);
734 break;
735 case GetHubDescriptor:
736 ohci_hub_descriptor (ohci, (struct usb_hub_descriptor *) buf);
737 break;
738 case GetHubStatus:
739 temp = roothub_status (ohci) & ~(RH_HS_CRWE | RH_HS_DRWE);
740 put_unaligned_le32(temp, buf);
741 break;
742 case GetPortStatus:
743 if (!wIndex || wIndex > ports)
744 goto error;
745 wIndex--;
746 temp = roothub_portstatus (ohci, wIndex);
747 put_unaligned_le32(temp, buf);
748
749 if (*(u16*)(buf+2)) /* only if wPortChange is interesting */
750 dbg_port(ohci, "GetStatus", wIndex, temp);
751 break;
752 case SetHubFeature:
753 switch (wValue) {
754 case C_HUB_OVER_CURRENT:
755 // FIXME: this can be cleared, yes?
756 case C_HUB_LOCAL_POWER:
757 break;
758 default:
759 goto error;
760 }
761 break;
762 case SetPortFeature:
763 if (!wIndex || wIndex > ports)
764 goto error;
765 wIndex--;
766 switch (wValue) {
767 case USB_PORT_FEAT_SUSPEND:
768 #ifdef CONFIG_USB_OTG
769 if (hcd->self.otg_port == (wIndex + 1)
770 && hcd->self.b_hnp_enable)
771 ohci->start_hnp(ohci);
772 else
773 #endif
774 ohci_writel (ohci, RH_PS_PSS,
775 &ohci->regs->roothub.portstatus [wIndex]);
776 break;
777 case USB_PORT_FEAT_POWER:
778 ohci_writel (ohci, RH_PS_PPS,
779 &ohci->regs->roothub.portstatus [wIndex]);
780 break;
781 case USB_PORT_FEAT_RESET:
782 retval = root_port_reset (ohci, wIndex);
783 break;
784 default:
785 goto error;
786 }
787 break;
788
789 default:
790 error:
791 /* "protocol stall" on error */
792 retval = -EPIPE;
793 }
794 return retval;
795 }
796 EXPORT_SYMBOL_GPL(ohci_hub_control);
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