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