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OHCI: Allow broken controllers to auto-stop
[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, 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(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
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(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
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
360 /* Carry out polling-, autostop-, and autoresume-related state changes */
361 static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
362 int any_connected)
363 {
364 int poll_rh = 1;
365 int rhsc_status, rhsc_enable;
366
367 /* Some broken controllers never turn off RHCS in the interrupt
368 * status register. For their sake we won't re-enable RHSC
369 * interrupts if the interrupt bit is already active.
370 */
371 rhsc_status = ohci_readl(ohci, &ohci->regs->intrstatus) &
372 OHCI_INTR_RHSC;
373 rhsc_enable = ohci_readl(ohci, &ohci->regs->intrenable) &
374 OHCI_INTR_RHSC;
375
376 switch (ohci->hc_control & OHCI_CTRL_HCFS) {
377 case OHCI_USB_OPER:
378 /* If no status changes are pending, enable RHSC interrupts. */
379 if (!rhsc_enable && !rhsc_status && !changed) {
380 rhsc_enable = OHCI_INTR_RHSC;
381 ohci_writel(ohci, rhsc_enable, &ohci->regs->intrenable);
382 }
383
384 /* Keep on polling until we know a device is connected
385 * and RHSC is enabled, or until we autostop.
386 */
387 if (!ohci->autostop) {
388 if (any_connected ||
389 !device_may_wakeup(&ohci_to_hcd(ohci)
390 ->self.root_hub->dev)) {
391 if (rhsc_enable)
392 poll_rh = 0;
393 } else {
394 ohci->autostop = 1;
395 ohci->next_statechange = jiffies + HZ;
396 }
397
398 /* if no devices have been attached for one second, autostop */
399 } else {
400 if (changed || any_connected) {
401 ohci->autostop = 0;
402 ohci->next_statechange = jiffies +
403 STATECHANGE_DELAY;
404 } else if (time_after_eq(jiffies,
405 ohci->next_statechange)
406 && !ohci->ed_rm_list
407 && !(ohci->hc_control &
408 OHCI_SCHED_ENABLES)) {
409 ohci_rh_suspend(ohci, 1);
410 if (rhsc_enable)
411 poll_rh = 0;
412 }
413 }
414 break;
415
416 case OHCI_USB_SUSPEND:
417 case OHCI_USB_RESUME:
418 /* if there is a port change, autostart or ask to be resumed */
419 if (changed) {
420 if (ohci->autostop)
421 ohci_rh_resume(ohci);
422 else
423 usb_hcd_resume_root_hub(ohci_to_hcd(ohci));
424 } else {
425 if (!rhsc_enable && !rhsc_status && (ohci->autostop ||
426 ohci_to_hcd(ohci)->self.root_hub->
427 do_remote_wakeup)) {
428 rhsc_enable = OHCI_INTR_RHSC;
429 ohci_writel(ohci, rhsc_enable,
430 &ohci->regs->intrenable);
431 }
432 if (rhsc_enable)
433 poll_rh = 0;
434 }
435 break;
436 }
437 return poll_rh;
438 }
439
440 #else /* CONFIG_PM */
441
442 static inline int ohci_rh_resume(struct ohci_hcd *ohci)
443 {
444 return 0;
445 }
446
447 /* Carry out polling-related state changes.
448 * autostop isn't used when CONFIG_PM is turned off.
449 */
450 static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
451 int any_connected)
452 {
453 int rhsc_status;
454
455 /* If RHSC is enabled, don't poll */
456 if (ohci_readl(ohci, &ohci->regs->intrenable) & OHCI_INTR_RHSC)
457 return 0;
458
459 /* If no status changes are pending, enable RHSC interrupts */
460 rhsc_status = ohci_readl(ohci, &ohci->regs->intrstatus) &
461 OHCI_INTR_RHSC;
462 if (!changed && !rhsc_status) {
463 ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrenable);
464 return 0;
465 }
466 return 1;
467 }
468
469 #endif /* CONFIG_PM */
470
471 /*-------------------------------------------------------------------------*/
472
473 /* build "status change" packet (one or two bytes) from HC registers */
474
475 static int
476 ohci_hub_status_data (struct usb_hcd *hcd, char *buf)
477 {
478 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
479 int i, changed = 0, length = 1;
480 int any_connected = 0;
481 unsigned long flags;
482
483 spin_lock_irqsave (&ohci->lock, flags);
484 if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))
485 goto done;
486
487 /* undocumented erratum seen on at least rev D */
488 if ((ohci->flags & OHCI_QUIRK_AMD756)
489 && (roothub_a (ohci) & RH_A_NDP) > MAX_ROOT_PORTS) {
490 ohci_warn (ohci, "bogus NDP, rereads as NDP=%d\n",
491 ohci_readl (ohci, &ohci->regs->roothub.a) & RH_A_NDP);
492 /* retry later; "should not happen" */
493 goto done;
494 }
495
496 /* init status */
497 if (roothub_status (ohci) & (RH_HS_LPSC | RH_HS_OCIC))
498 buf [0] = changed = 1;
499 else
500 buf [0] = 0;
501 if (ohci->num_ports > 7) {
502 buf [1] = 0;
503 length++;
504 }
505
506 /* look at each port */
507 for (i = 0; i < ohci->num_ports; i++) {
508 u32 status = roothub_portstatus (ohci, i);
509
510 /* can't autostop if ports are connected */
511 any_connected |= (status & RH_PS_CCS);
512
513 if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC
514 | RH_PS_OCIC | RH_PS_PRSC)) {
515 changed = 1;
516 if (i < 7)
517 buf [0] |= 1 << (i + 1);
518 else
519 buf [1] |= 1 << (i - 7);
520 }
521 }
522
523 hcd->poll_rh = ohci_root_hub_state_changes(ohci, changed,
524 any_connected);
525
526 done:
527 spin_unlock_irqrestore (&ohci->lock, flags);
528
529 return changed ? length : 0;
530 }
531
532 /*-------------------------------------------------------------------------*/
533
534 static void
535 ohci_hub_descriptor (
536 struct ohci_hcd *ohci,
537 struct usb_hub_descriptor *desc
538 ) {
539 u32 rh = roothub_a (ohci);
540 u16 temp;
541
542 desc->bDescriptorType = 0x29;
543 desc->bPwrOn2PwrGood = (rh & RH_A_POTPGT) >> 24;
544 desc->bHubContrCurrent = 0;
545
546 desc->bNbrPorts = ohci->num_ports;
547 temp = 1 + (ohci->num_ports / 8);
548 desc->bDescLength = 7 + 2 * temp;
549
550 temp = 0;
551 if (rh & RH_A_NPS) /* no power switching? */
552 temp |= 0x0002;
553 if (rh & RH_A_PSM) /* per-port power switching? */
554 temp |= 0x0001;
555 if (rh & RH_A_NOCP) /* no overcurrent reporting? */
556 temp |= 0x0010;
557 else if (rh & RH_A_OCPM) /* per-port overcurrent reporting? */
558 temp |= 0x0008;
559 desc->wHubCharacteristics = (__force __u16)cpu_to_hc16(ohci, temp);
560
561 /* two bitmaps: ports removable, and usb 1.0 legacy PortPwrCtrlMask */
562 rh = roothub_b (ohci);
563 memset(desc->bitmap, 0xff, sizeof(desc->bitmap));
564 desc->bitmap [0] = rh & RH_B_DR;
565 if (ohci->num_ports > 7) {
566 desc->bitmap [1] = (rh & RH_B_DR) >> 8;
567 desc->bitmap [2] = 0xff;
568 } else
569 desc->bitmap [1] = 0xff;
570 }
571
572 /*-------------------------------------------------------------------------*/
573
574 #ifdef CONFIG_USB_OTG
575
576 static int ohci_start_port_reset (struct usb_hcd *hcd, unsigned port)
577 {
578 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
579 u32 status;
580
581 if (!port)
582 return -EINVAL;
583 port--;
584
585 /* start port reset before HNP protocol times out */
586 status = ohci_readl(ohci, &ohci->regs->roothub.portstatus [port]);
587 if (!(status & RH_PS_CCS))
588 return -ENODEV;
589
590 /* khubd will finish the reset later */
591 ohci_writel(ohci, RH_PS_PRS, &ohci->regs->roothub.portstatus [port]);
592 return 0;
593 }
594
595 #else
596
597 #define ohci_start_port_reset NULL
598
599 #endif
600
601 /*-------------------------------------------------------------------------*/
602
603
604 /* See usb 7.1.7.5: root hubs must issue at least 50 msec reset signaling,
605 * not necessarily continuous ... to guard against resume signaling.
606 * The short timeout is safe for non-root hubs, and is backward-compatible
607 * with earlier Linux hosts.
608 */
609 #ifdef CONFIG_USB_SUSPEND
610 #define PORT_RESET_MSEC 50
611 #else
612 #define PORT_RESET_MSEC 10
613 #endif
614
615 /* this timer value might be vendor-specific ... */
616 #define PORT_RESET_HW_MSEC 10
617
618 /* wrap-aware logic morphed from <linux/jiffies.h> */
619 #define tick_before(t1,t2) ((s16)(((s16)(t1))-((s16)(t2))) < 0)
620
621 /* called from some task, normally khubd */
622 static inline int root_port_reset (struct ohci_hcd *ohci, unsigned port)
623 {
624 __hc32 __iomem *portstat = &ohci->regs->roothub.portstatus [port];
625 u32 temp = 0;
626 u16 now = ohci_readl(ohci, &ohci->regs->fmnumber);
627 u16 reset_done = now + PORT_RESET_MSEC;
628 int limit_1 = DIV_ROUND_UP(PORT_RESET_MSEC, PORT_RESET_HW_MSEC);
629
630 /* build a "continuous enough" reset signal, with up to
631 * 3msec gap between pulses. scheduler HZ==100 must work;
632 * this might need to be deadline-scheduled.
633 */
634 do {
635 int limit_2;
636
637 /* spin until any current reset finishes */
638 limit_2 = PORT_RESET_HW_MSEC * 2;
639 while (--limit_2 >= 0) {
640 temp = ohci_readl (ohci, portstat);
641 /* handle e.g. CardBus eject */
642 if (temp == ~(u32)0)
643 return -ESHUTDOWN;
644 if (!(temp & RH_PS_PRS))
645 break;
646 udelay (500);
647 }
648
649 /* timeout (a hardware error) has been observed when
650 * EHCI sets CF while this driver is resetting a port;
651 * presumably other disconnect paths might do it too.
652 */
653 if (limit_2 < 0) {
654 ohci_dbg(ohci,
655 "port[%d] reset timeout, stat %08x\n",
656 port, temp);
657 break;
658 }
659
660 if (!(temp & RH_PS_CCS))
661 break;
662 if (temp & RH_PS_PRSC)
663 ohci_writel (ohci, RH_PS_PRSC, portstat);
664
665 /* start the next reset, sleep till it's probably done */
666 ohci_writel (ohci, RH_PS_PRS, portstat);
667 msleep(PORT_RESET_HW_MSEC);
668 now = ohci_readl(ohci, &ohci->regs->fmnumber);
669 } while (tick_before(now, reset_done) && --limit_1 >= 0);
670
671 /* caller synchronizes using PRSC ... and handles PRS
672 * still being set when this returns.
673 */
674
675 return 0;
676 }
677
678 static int ohci_hub_control (
679 struct usb_hcd *hcd,
680 u16 typeReq,
681 u16 wValue,
682 u16 wIndex,
683 char *buf,
684 u16 wLength
685 ) {
686 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
687 int ports = hcd_to_bus (hcd)->root_hub->maxchild;
688 u32 temp;
689 int retval = 0;
690
691 if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
692 return -ESHUTDOWN;
693
694 switch (typeReq) {
695 case ClearHubFeature:
696 switch (wValue) {
697 case C_HUB_OVER_CURRENT:
698 ohci_writel (ohci, RH_HS_OCIC,
699 &ohci->regs->roothub.status);
700 case C_HUB_LOCAL_POWER:
701 break;
702 default:
703 goto error;
704 }
705 break;
706 case ClearPortFeature:
707 if (!wIndex || wIndex > ports)
708 goto error;
709 wIndex--;
710
711 switch (wValue) {
712 case USB_PORT_FEAT_ENABLE:
713 temp = RH_PS_CCS;
714 break;
715 case USB_PORT_FEAT_C_ENABLE:
716 temp = RH_PS_PESC;
717 break;
718 case USB_PORT_FEAT_SUSPEND:
719 temp = RH_PS_POCI;
720 break;
721 case USB_PORT_FEAT_C_SUSPEND:
722 temp = RH_PS_PSSC;
723 break;
724 case USB_PORT_FEAT_POWER:
725 temp = RH_PS_LSDA;
726 break;
727 case USB_PORT_FEAT_C_CONNECTION:
728 temp = RH_PS_CSC;
729 break;
730 case USB_PORT_FEAT_C_OVER_CURRENT:
731 temp = RH_PS_OCIC;
732 break;
733 case USB_PORT_FEAT_C_RESET:
734 temp = RH_PS_PRSC;
735 break;
736 default:
737 goto error;
738 }
739 ohci_writel (ohci, temp,
740 &ohci->regs->roothub.portstatus [wIndex]);
741 // ohci_readl (ohci, &ohci->regs->roothub.portstatus [wIndex]);
742 break;
743 case GetHubDescriptor:
744 ohci_hub_descriptor (ohci, (struct usb_hub_descriptor *) buf);
745 break;
746 case GetHubStatus:
747 temp = roothub_status (ohci) & ~(RH_HS_CRWE | RH_HS_DRWE);
748 put_unaligned_le32(temp, buf);
749 break;
750 case GetPortStatus:
751 if (!wIndex || wIndex > ports)
752 goto error;
753 wIndex--;
754 temp = roothub_portstatus (ohci, wIndex);
755 put_unaligned_le32(temp, buf);
756
757 #ifndef OHCI_VERBOSE_DEBUG
758 if (*(u16*)(buf+2)) /* only if wPortChange is interesting */
759 #endif
760 dbg_port (ohci, "GetStatus", wIndex, temp);
761 break;
762 case SetHubFeature:
763 switch (wValue) {
764 case C_HUB_OVER_CURRENT:
765 // FIXME: this can be cleared, yes?
766 case C_HUB_LOCAL_POWER:
767 break;
768 default:
769 goto error;
770 }
771 break;
772 case SetPortFeature:
773 if (!wIndex || wIndex > ports)
774 goto error;
775 wIndex--;
776 switch (wValue) {
777 case USB_PORT_FEAT_SUSPEND:
778 #ifdef CONFIG_USB_OTG
779 if (hcd->self.otg_port == (wIndex + 1)
780 && hcd->self.b_hnp_enable)
781 ohci->start_hnp(ohci);
782 else
783 #endif
784 ohci_writel (ohci, RH_PS_PSS,
785 &ohci->regs->roothub.portstatus [wIndex]);
786 break;
787 case USB_PORT_FEAT_POWER:
788 ohci_writel (ohci, RH_PS_PPS,
789 &ohci->regs->roothub.portstatus [wIndex]);
790 break;
791 case USB_PORT_FEAT_RESET:
792 retval = root_port_reset (ohci, wIndex);
793 break;
794 default:
795 goto error;
796 }
797 break;
798
799 default:
800 error:
801 /* "protocol stall" on error */
802 retval = -EPIPE;
803 }
804 return retval;
805 }
806
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