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