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Merge branch 'x86-uv-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[deliverable/linux.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, temp, \
21 (temp & RH_PS_PRSC) ? " PRSC" : "", \
22 (temp & RH_PS_OCIC) ? " OCIC" : "", \
23 (temp & RH_PS_PSSC) ? " PSSC" : "", \
24 (temp & RH_PS_PESC) ? " PESC" : "", \
25 (temp & RH_PS_CSC) ? " CSC" : "", \
26 \
27 (temp & RH_PS_LSDA) ? " LSDA" : "", \
28 (temp & RH_PS_PPS) ? " PPS" : "", \
29 (temp & RH_PS_PRS) ? " PRS" : "", \
30 (temp & RH_PS_POCI) ? " POCI" : "", \
31 (temp & RH_PS_PSS) ? " PSS" : "", \
32 \
33 (temp & RH_PS_PES) ? " PES" : "", \
34 (temp & 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 dl_done_list (struct ohci_hcd *);
43 static void finish_unlinks (struct ohci_hcd *, u16);
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 dl_done_list (ohci);
91 finish_unlinks (ohci, ohci_frame_no(ohci));
92
93 /* maybe resume can wake root hub */
94 if (ohci_to_hcd(ohci)->self.root_hub->do_remote_wakeup || autostop) {
95 ohci->hc_control |= OHCI_CTRL_RWE;
96 } else {
97 ohci_writel(ohci, OHCI_INTR_RHSC | OHCI_INTR_RD,
98 &ohci->regs->intrdisable);
99 ohci->hc_control &= ~OHCI_CTRL_RWE;
100 }
101
102 /* Suspend hub ... this is the "global (to this bus) suspend" mode,
103 * which doesn't imply ports will first be individually suspended.
104 */
105 ohci->hc_control &= ~OHCI_CTRL_HCFS;
106 ohci->hc_control |= OHCI_USB_SUSPEND;
107 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
108 (void) ohci_readl (ohci, &ohci->regs->control);
109
110 /* no resumes until devices finish suspending */
111 if (!autostop) {
112 ohci->next_statechange = jiffies + msecs_to_jiffies (5);
113 ohci->autostop = 0;
114 }
115
116 done:
117 return status;
118 }
119
120 static inline struct ed *find_head (struct ed *ed)
121 {
122 /* for bulk and control lists */
123 while (ed->ed_prev)
124 ed = ed->ed_prev;
125 return ed;
126 }
127
128 /* caller has locked the root hub */
129 static int ohci_rh_resume (struct ohci_hcd *ohci)
130 __releases(ohci->lock)
131 __acquires(ohci->lock)
132 {
133 struct usb_hcd *hcd = ohci_to_hcd (ohci);
134 u32 temp, enables;
135 int status = -EINPROGRESS;
136 int autostopped = ohci->autostop;
137
138 ohci->autostop = 0;
139 ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
140
141 if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) {
142 /* this can happen after resuming a swsusp snapshot */
143 if (hcd->state == HC_STATE_RESUMING) {
144 ohci_dbg (ohci, "BIOS/SMM active, control %03x\n",
145 ohci->hc_control);
146 status = -EBUSY;
147 /* this happens when pmcore resumes HC then root */
148 } else {
149 ohci_dbg (ohci, "duplicate resume\n");
150 status = 0;
151 }
152 } else switch (ohci->hc_control & OHCI_CTRL_HCFS) {
153 case OHCI_USB_SUSPEND:
154 ohci->hc_control &= ~(OHCI_CTRL_HCFS|OHCI_SCHED_ENABLES);
155 ohci->hc_control |= OHCI_USB_RESUME;
156 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
157 (void) ohci_readl (ohci, &ohci->regs->control);
158 ohci_dbg (ohci, "%s root hub\n",
159 autostopped ? "auto-start" : "resume");
160 break;
161 case OHCI_USB_RESUME:
162 /* HCFS changes sometime after INTR_RD */
163 ohci_dbg(ohci, "%swakeup root hub\n",
164 autostopped ? "auto-" : "");
165 break;
166 case OHCI_USB_OPER:
167 /* this can happen after resuming a swsusp snapshot */
168 ohci_dbg (ohci, "snapshot resume? reinit\n");
169 status = -EBUSY;
170 break;
171 default: /* RESET, we lost power */
172 ohci_dbg (ohci, "lost power\n");
173 status = -EBUSY;
174 }
175 if (status == -EBUSY) {
176 if (!autostopped) {
177 spin_unlock_irq (&ohci->lock);
178 (void) ohci_init (ohci);
179 status = ohci_restart (ohci);
180
181 usb_root_hub_lost_power(hcd->self.root_hub);
182
183 spin_lock_irq (&ohci->lock);
184 }
185 return status;
186 }
187 if (status != -EINPROGRESS)
188 return status;
189 if (autostopped)
190 goto skip_resume;
191 spin_unlock_irq (&ohci->lock);
192
193 /* Some controllers (lucent erratum) need extra-long delays */
194 msleep (20 /* usb 11.5.1.10 */ + 12 /* 32 msec counter */ + 1);
195
196 temp = ohci_readl (ohci, &ohci->regs->control);
197 temp &= OHCI_CTRL_HCFS;
198 if (temp != OHCI_USB_RESUME) {
199 ohci_err (ohci, "controller won't resume\n");
200 spin_lock_irq(&ohci->lock);
201 return -EBUSY;
202 }
203
204 /* disable old schedule state, reinit from scratch */
205 ohci_writel (ohci, 0, &ohci->regs->ed_controlhead);
206 ohci_writel (ohci, 0, &ohci->regs->ed_controlcurrent);
207 ohci_writel (ohci, 0, &ohci->regs->ed_bulkhead);
208 ohci_writel (ohci, 0, &ohci->regs->ed_bulkcurrent);
209 ohci_writel (ohci, 0, &ohci->regs->ed_periodcurrent);
210 ohci_writel (ohci, (u32) ohci->hcca_dma, &ohci->regs->hcca);
211
212 /* Sometimes PCI D3 suspend trashes frame timings ... */
213 periodic_reinit (ohci);
214
215 /* the following code is executed with ohci->lock held and
216 * irqs disabled if and only if autostopped is true
217 */
218
219 skip_resume:
220 /* interrupts might have been disabled */
221 ohci_writel (ohci, OHCI_INTR_INIT, &ohci->regs->intrenable);
222 if (ohci->ed_rm_list)
223 ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrenable);
224
225 /* Then re-enable operations */
226 ohci_writel (ohci, OHCI_USB_OPER, &ohci->regs->control);
227 (void) ohci_readl (ohci, &ohci->regs->control);
228 if (!autostopped)
229 msleep (3);
230
231 temp = ohci->hc_control;
232 temp &= OHCI_CTRL_RWC;
233 temp |= OHCI_CONTROL_INIT | OHCI_USB_OPER;
234 ohci->hc_control = temp;
235 ohci_writel (ohci, temp, &ohci->regs->control);
236 (void) ohci_readl (ohci, &ohci->regs->control);
237
238 /* TRSMRCY */
239 if (!autostopped) {
240 msleep (10);
241 spin_lock_irq (&ohci->lock);
242 }
243 /* now ohci->lock is always held and irqs are always disabled */
244
245 /* keep it alive for more than ~5x suspend + resume costs */
246 ohci->next_statechange = jiffies + STATECHANGE_DELAY;
247
248 /* maybe turn schedules back on */
249 enables = 0;
250 temp = 0;
251 if (!ohci->ed_rm_list) {
252 if (ohci->ed_controltail) {
253 ohci_writel (ohci,
254 find_head (ohci->ed_controltail)->dma,
255 &ohci->regs->ed_controlhead);
256 enables |= OHCI_CTRL_CLE;
257 temp |= OHCI_CLF;
258 }
259 if (ohci->ed_bulktail) {
260 ohci_writel (ohci, find_head (ohci->ed_bulktail)->dma,
261 &ohci->regs->ed_bulkhead);
262 enables |= OHCI_CTRL_BLE;
263 temp |= OHCI_BLF;
264 }
265 }
266 if (hcd->self.bandwidth_isoc_reqs || hcd->self.bandwidth_int_reqs)
267 enables |= OHCI_CTRL_PLE|OHCI_CTRL_IE;
268 if (enables) {
269 ohci_dbg (ohci, "restarting schedules ... %08x\n", enables);
270 ohci->hc_control |= enables;
271 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
272 if (temp)
273 ohci_writel (ohci, temp, &ohci->regs->cmdstatus);
274 (void) ohci_readl (ohci, &ohci->regs->control);
275 }
276
277 return 0;
278 }
279
280 static int ohci_bus_suspend (struct usb_hcd *hcd)
281 {
282 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
283 int rc;
284
285 spin_lock_irq (&ohci->lock);
286
287 if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
288 rc = -ESHUTDOWN;
289 else
290 rc = ohci_rh_suspend (ohci, 0);
291 spin_unlock_irq (&ohci->lock);
292 return rc;
293 }
294
295 static int ohci_bus_resume (struct usb_hcd *hcd)
296 {
297 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
298 int rc;
299
300 if (time_before (jiffies, ohci->next_statechange))
301 msleep(5);
302
303 spin_lock_irq (&ohci->lock);
304
305 if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
306 rc = -ESHUTDOWN;
307 else
308 rc = ohci_rh_resume (ohci);
309 spin_unlock_irq (&ohci->lock);
310
311 /* poll until we know a device is connected or we autostop */
312 if (rc == 0)
313 usb_hcd_poll_rh_status(hcd);
314 return rc;
315 }
316
317 /* Carry out the final steps of resuming the controller device */
318 static void ohci_finish_controller_resume(struct usb_hcd *hcd)
319 {
320 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
321 int port;
322 bool need_reinit = false;
323
324 /* See if the controller is already running or has been reset */
325 ohci->hc_control = ohci_readl(ohci, &ohci->regs->control);
326 if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) {
327 need_reinit = true;
328 } else {
329 switch (ohci->hc_control & OHCI_CTRL_HCFS) {
330 case OHCI_USB_OPER:
331 case OHCI_USB_RESET:
332 need_reinit = true;
333 }
334 }
335
336 /* If needed, reinitialize and suspend the root hub */
337 if (need_reinit) {
338 spin_lock_irq(&ohci->lock);
339 hcd->state = HC_STATE_RESUMING;
340 ohci_rh_resume(ohci);
341 hcd->state = HC_STATE_QUIESCING;
342 ohci_rh_suspend(ohci, 0);
343 hcd->state = HC_STATE_SUSPENDED;
344 spin_unlock_irq(&ohci->lock);
345 }
346
347 /* Normally just turn on port power and enable interrupts */
348 else {
349 ohci_dbg(ohci, "powerup ports\n");
350 for (port = 0; port < ohci->num_ports; port++)
351 ohci_writel(ohci, RH_PS_PPS,
352 &ohci->regs->roothub.portstatus[port]);
353
354 ohci_writel(ohci, OHCI_INTR_MIE, &ohci->regs->intrenable);
355 ohci_readl(ohci, &ohci->regs->intrenable);
356 msleep(20);
357 }
358
359 /* Does the root hub have a port wakeup pending? */
360 if (ohci_readl(ohci, &ohci->regs->intrstatus) &
361 (OHCI_INTR_RD | OHCI_INTR_RHSC))
362 usb_hcd_resume_root_hub(hcd);
363 }
364
365 /* Carry out polling-, autostop-, and autoresume-related state changes */
366 static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
367 int any_connected, int rhsc_status)
368 {
369 int poll_rh = 1;
370 int rhsc_enable;
371
372 /* Some broken controllers never turn off RHSC in the interrupt
373 * status register. For their sake we won't re-enable RHSC
374 * interrupts if the interrupt bit is already active.
375 */
376 rhsc_enable = ohci_readl(ohci, &ohci->regs->intrenable) &
377 OHCI_INTR_RHSC;
378
379 switch (ohci->hc_control & OHCI_CTRL_HCFS) {
380 case OHCI_USB_OPER:
381 /* If no status changes are pending, enable RHSC interrupts. */
382 if (!rhsc_enable && !rhsc_status && !changed) {
383 rhsc_enable = OHCI_INTR_RHSC;
384 ohci_writel(ohci, rhsc_enable, &ohci->regs->intrenable);
385 }
386
387 /* Keep on polling until we know a device is connected
388 * and RHSC is enabled, or until we autostop.
389 */
390 if (!ohci->autostop) {
391 if (any_connected ||
392 !device_may_wakeup(&ohci_to_hcd(ohci)
393 ->self.root_hub->dev)) {
394 if (rhsc_enable)
395 poll_rh = 0;
396 } else {
397 ohci->autostop = 1;
398 ohci->next_statechange = jiffies + HZ;
399 }
400
401 /* if no devices have been attached for one second, autostop */
402 } else {
403 if (changed || any_connected) {
404 ohci->autostop = 0;
405 ohci->next_statechange = jiffies +
406 STATECHANGE_DELAY;
407 } else if (time_after_eq(jiffies,
408 ohci->next_statechange)
409 && !ohci->ed_rm_list
410 && !(ohci->hc_control &
411 OHCI_SCHED_ENABLES)) {
412 ohci_rh_suspend(ohci, 1);
413 if (rhsc_enable)
414 poll_rh = 0;
415 }
416 }
417 break;
418
419 case OHCI_USB_SUSPEND:
420 case OHCI_USB_RESUME:
421 /* if there is a port change, autostart or ask to be resumed */
422 if (changed) {
423 if (ohci->autostop)
424 ohci_rh_resume(ohci);
425 else
426 usb_hcd_resume_root_hub(ohci_to_hcd(ohci));
427
428 /* If remote wakeup is disabled, stop polling */
429 } else if (!ohci->autostop &&
430 !ohci_to_hcd(ohci)->self.root_hub->
431 do_remote_wakeup) {
432 poll_rh = 0;
433
434 } else {
435 /* If no status changes are pending,
436 * enable RHSC interrupts
437 */
438 if (!rhsc_enable && !rhsc_status) {
439 rhsc_enable = OHCI_INTR_RHSC;
440 ohci_writel(ohci, rhsc_enable,
441 &ohci->regs->intrenable);
442 }
443 /* Keep polling until RHSC is enabled */
444 if (rhsc_enable)
445 poll_rh = 0;
446 }
447 break;
448 }
449 return poll_rh;
450 }
451
452 #else /* CONFIG_PM */
453
454 static inline int ohci_rh_resume(struct ohci_hcd *ohci)
455 {
456 return 0;
457 }
458
459 /* Carry out polling-related state changes.
460 * autostop isn't used when CONFIG_PM is turned off.
461 */
462 static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
463 int any_connected, int rhsc_status)
464 {
465 /* If RHSC is enabled, don't poll */
466 if (ohci_readl(ohci, &ohci->regs->intrenable) & OHCI_INTR_RHSC)
467 return 0;
468
469 /* If status changes are pending, continue polling.
470 * Conversely, if no status changes are pending but the RHSC
471 * status bit was set, then RHSC may be broken so continue polling.
472 */
473 if (changed || rhsc_status)
474 return 1;
475
476 /* It's safe to re-enable RHSC interrupts */
477 ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrenable);
478 return 0;
479 }
480
481 #endif /* CONFIG_PM */
482
483 /*-------------------------------------------------------------------------*/
484
485 /* build "status change" packet (one or two bytes) from HC registers */
486
487 static int
488 ohci_hub_status_data (struct usb_hcd *hcd, char *buf)
489 {
490 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
491 int i, changed = 0, length = 1;
492 int any_connected = 0;
493 int rhsc_status;
494 unsigned long flags;
495
496 spin_lock_irqsave (&ohci->lock, flags);
497 if (!HCD_HW_ACCESSIBLE(hcd))
498 goto done;
499
500 /* undocumented erratum seen on at least rev D */
501 if ((ohci->flags & OHCI_QUIRK_AMD756)
502 && (roothub_a (ohci) & RH_A_NDP) > MAX_ROOT_PORTS) {
503 ohci_warn (ohci, "bogus NDP, rereads as NDP=%d\n",
504 ohci_readl (ohci, &ohci->regs->roothub.a) & RH_A_NDP);
505 /* retry later; "should not happen" */
506 goto done;
507 }
508
509 /* init status */
510 if (roothub_status (ohci) & (RH_HS_LPSC | RH_HS_OCIC))
511 buf [0] = changed = 1;
512 else
513 buf [0] = 0;
514 if (ohci->num_ports > 7) {
515 buf [1] = 0;
516 length++;
517 }
518
519 /* Clear the RHSC status flag before reading the port statuses */
520 ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrstatus);
521 rhsc_status = ohci_readl(ohci, &ohci->regs->intrstatus) &
522 OHCI_INTR_RHSC;
523
524 /* look at each port */
525 for (i = 0; i < ohci->num_ports; i++) {
526 u32 status = roothub_portstatus (ohci, i);
527
528 /* can't autostop if ports are connected */
529 any_connected |= (status & RH_PS_CCS);
530
531 if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC
532 | RH_PS_OCIC | RH_PS_PRSC)) {
533 changed = 1;
534 if (i < 7)
535 buf [0] |= 1 << (i + 1);
536 else
537 buf [1] |= 1 << (i - 7);
538 }
539 }
540
541 if (ohci_root_hub_state_changes(ohci, changed,
542 any_connected, rhsc_status))
543 set_bit(HCD_FLAG_POLL_RH, &hcd->flags);
544 else
545 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
546
547
548 done:
549 spin_unlock_irqrestore (&ohci->lock, flags);
550
551 return changed ? length : 0;
552 }
553
554 /*-------------------------------------------------------------------------*/
555
556 static void
557 ohci_hub_descriptor (
558 struct ohci_hcd *ohci,
559 struct usb_hub_descriptor *desc
560 ) {
561 u32 rh = roothub_a (ohci);
562 u16 temp;
563
564 desc->bDescriptorType = 0x29;
565 desc->bPwrOn2PwrGood = (rh & RH_A_POTPGT) >> 24;
566 desc->bHubContrCurrent = 0;
567
568 desc->bNbrPorts = ohci->num_ports;
569 temp = 1 + (ohci->num_ports / 8);
570 desc->bDescLength = 7 + 2 * temp;
571
572 temp = 0;
573 if (rh & RH_A_NPS) /* no power switching? */
574 temp |= 0x0002;
575 if (rh & RH_A_PSM) /* per-port power switching? */
576 temp |= 0x0001;
577 if (rh & RH_A_NOCP) /* no overcurrent reporting? */
578 temp |= 0x0010;
579 else if (rh & RH_A_OCPM) /* per-port overcurrent reporting? */
580 temp |= 0x0008;
581 desc->wHubCharacteristics = (__force __u16)cpu_to_hc16(ohci, temp);
582
583 /* two bitmaps: ports removable, and usb 1.0 legacy PortPwrCtrlMask */
584 rh = roothub_b (ohci);
585 memset(desc->bitmap, 0xff, sizeof(desc->bitmap));
586 desc->bitmap [0] = rh & RH_B_DR;
587 if (ohci->num_ports > 7) {
588 desc->bitmap [1] = (rh & RH_B_DR) >> 8;
589 desc->bitmap [2] = 0xff;
590 } else
591 desc->bitmap [1] = 0xff;
592 }
593
594 /*-------------------------------------------------------------------------*/
595
596 #ifdef CONFIG_USB_OTG
597
598 static int ohci_start_port_reset (struct usb_hcd *hcd, unsigned port)
599 {
600 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
601 u32 status;
602
603 if (!port)
604 return -EINVAL;
605 port--;
606
607 /* start port reset before HNP protocol times out */
608 status = ohci_readl(ohci, &ohci->regs->roothub.portstatus [port]);
609 if (!(status & RH_PS_CCS))
610 return -ENODEV;
611
612 /* khubd will finish the reset later */
613 ohci_writel(ohci, RH_PS_PRS, &ohci->regs->roothub.portstatus [port]);
614 return 0;
615 }
616
617 #else
618
619 #define ohci_start_port_reset NULL
620
621 #endif
622
623 /*-------------------------------------------------------------------------*/
624
625
626 /* See usb 7.1.7.5: root hubs must issue at least 50 msec reset signaling,
627 * not necessarily continuous ... to guard against resume signaling.
628 * The short timeout is safe for non-root hubs, and is backward-compatible
629 * with earlier Linux hosts.
630 */
631 #ifdef CONFIG_USB_SUSPEND
632 #define PORT_RESET_MSEC 50
633 #else
634 #define PORT_RESET_MSEC 10
635 #endif
636
637 /* this timer value might be vendor-specific ... */
638 #define PORT_RESET_HW_MSEC 10
639
640 /* wrap-aware logic morphed from <linux/jiffies.h> */
641 #define tick_before(t1,t2) ((s16)(((s16)(t1))-((s16)(t2))) < 0)
642
643 /* called from some task, normally khubd */
644 static inline int root_port_reset (struct ohci_hcd *ohci, unsigned port)
645 {
646 __hc32 __iomem *portstat = &ohci->regs->roothub.portstatus [port];
647 u32 temp = 0;
648 u16 now = ohci_readl(ohci, &ohci->regs->fmnumber);
649 u16 reset_done = now + PORT_RESET_MSEC;
650 int limit_1 = DIV_ROUND_UP(PORT_RESET_MSEC, PORT_RESET_HW_MSEC);
651
652 /* build a "continuous enough" reset signal, with up to
653 * 3msec gap between pulses. scheduler HZ==100 must work;
654 * this might need to be deadline-scheduled.
655 */
656 do {
657 int limit_2;
658
659 /* spin until any current reset finishes */
660 limit_2 = PORT_RESET_HW_MSEC * 2;
661 while (--limit_2 >= 0) {
662 temp = ohci_readl (ohci, portstat);
663 /* handle e.g. CardBus eject */
664 if (temp == ~(u32)0)
665 return -ESHUTDOWN;
666 if (!(temp & RH_PS_PRS))
667 break;
668 udelay (500);
669 }
670
671 /* timeout (a hardware error) has been observed when
672 * EHCI sets CF while this driver is resetting a port;
673 * presumably other disconnect paths might do it too.
674 */
675 if (limit_2 < 0) {
676 ohci_dbg(ohci,
677 "port[%d] reset timeout, stat %08x\n",
678 port, temp);
679 break;
680 }
681
682 if (!(temp & RH_PS_CCS))
683 break;
684 if (temp & RH_PS_PRSC)
685 ohci_writel (ohci, RH_PS_PRSC, portstat);
686
687 /* start the next reset, sleep till it's probably done */
688 ohci_writel (ohci, RH_PS_PRS, portstat);
689 msleep(PORT_RESET_HW_MSEC);
690 now = ohci_readl(ohci, &ohci->regs->fmnumber);
691 } while (tick_before(now, reset_done) && --limit_1 >= 0);
692
693 /* caller synchronizes using PRSC ... and handles PRS
694 * still being set when this returns.
695 */
696
697 return 0;
698 }
699
700 static int ohci_hub_control (
701 struct usb_hcd *hcd,
702 u16 typeReq,
703 u16 wValue,
704 u16 wIndex,
705 char *buf,
706 u16 wLength
707 ) {
708 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
709 int ports = ohci->num_ports;
710 u32 temp;
711 int retval = 0;
712
713 if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
714 return -ESHUTDOWN;
715
716 switch (typeReq) {
717 case ClearHubFeature:
718 switch (wValue) {
719 case C_HUB_OVER_CURRENT:
720 ohci_writel (ohci, RH_HS_OCIC,
721 &ohci->regs->roothub.status);
722 case C_HUB_LOCAL_POWER:
723 break;
724 default:
725 goto error;
726 }
727 break;
728 case ClearPortFeature:
729 if (!wIndex || wIndex > ports)
730 goto error;
731 wIndex--;
732
733 switch (wValue) {
734 case USB_PORT_FEAT_ENABLE:
735 temp = RH_PS_CCS;
736 break;
737 case USB_PORT_FEAT_C_ENABLE:
738 temp = RH_PS_PESC;
739 break;
740 case USB_PORT_FEAT_SUSPEND:
741 temp = RH_PS_POCI;
742 break;
743 case USB_PORT_FEAT_C_SUSPEND:
744 temp = RH_PS_PSSC;
745 break;
746 case USB_PORT_FEAT_POWER:
747 temp = RH_PS_LSDA;
748 break;
749 case USB_PORT_FEAT_C_CONNECTION:
750 temp = RH_PS_CSC;
751 break;
752 case USB_PORT_FEAT_C_OVER_CURRENT:
753 temp = RH_PS_OCIC;
754 break;
755 case USB_PORT_FEAT_C_RESET:
756 temp = RH_PS_PRSC;
757 break;
758 default:
759 goto error;
760 }
761 ohci_writel (ohci, temp,
762 &ohci->regs->roothub.portstatus [wIndex]);
763 // ohci_readl (ohci, &ohci->regs->roothub.portstatus [wIndex]);
764 break;
765 case GetHubDescriptor:
766 ohci_hub_descriptor (ohci, (struct usb_hub_descriptor *) buf);
767 break;
768 case GetHubStatus:
769 temp = roothub_status (ohci) & ~(RH_HS_CRWE | RH_HS_DRWE);
770 put_unaligned_le32(temp, buf);
771 break;
772 case GetPortStatus:
773 if (!wIndex || wIndex > ports)
774 goto error;
775 wIndex--;
776 temp = roothub_portstatus (ohci, wIndex);
777 put_unaligned_le32(temp, buf);
778
779 #ifndef OHCI_VERBOSE_DEBUG
780 if (*(u16*)(buf+2)) /* only if wPortChange is interesting */
781 #endif
782 dbg_port (ohci, "GetStatus", wIndex, temp);
783 break;
784 case SetHubFeature:
785 switch (wValue) {
786 case C_HUB_OVER_CURRENT:
787 // FIXME: this can be cleared, yes?
788 case C_HUB_LOCAL_POWER:
789 break;
790 default:
791 goto error;
792 }
793 break;
794 case SetPortFeature:
795 if (!wIndex || wIndex > ports)
796 goto error;
797 wIndex--;
798 switch (wValue) {
799 case USB_PORT_FEAT_SUSPEND:
800 #ifdef CONFIG_USB_OTG
801 if (hcd->self.otg_port == (wIndex + 1)
802 && hcd->self.b_hnp_enable)
803 ohci->start_hnp(ohci);
804 else
805 #endif
806 ohci_writel (ohci, RH_PS_PSS,
807 &ohci->regs->roothub.portstatus [wIndex]);
808 break;
809 case USB_PORT_FEAT_POWER:
810 ohci_writel (ohci, RH_PS_PPS,
811 &ohci->regs->roothub.portstatus [wIndex]);
812 break;
813 case USB_PORT_FEAT_RESET:
814 retval = root_port_reset (ohci, wIndex);
815 break;
816 default:
817 goto error;
818 }
819 break;
820
821 default:
822 error:
823 /* "protocol stall" on error */
824 retval = -EPIPE;
825 }
826 return retval;
827 }
828
Linux kernel - Deliverables
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