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
ohci_rh_suspend(struct ohci_hcd * ohci,int autostop)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
find_head(struct ed * ed)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 */
ohci_rh_resume(struct ohci_hcd * ohci)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
ohci_bus_suspend(struct usb_hcd * hcd)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
ohci_bus_resume(struct usb_hcd * hcd)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 */
ohci_finish_controller_resume(struct usb_hcd * hcd)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 */
ohci_root_hub_state_changes(struct ohci_hcd * ohci,int changed,int any_connected,int rhsc_status)361 static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
362 int any_connected, int rhsc_status)
363 {
364 int poll_rh = 1;
365 int 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_enable = ohci_readl(ohci, &ohci->regs->intrenable) &
372 OHCI_INTR_RHSC;
373
374 switch (ohci->hc_control & OHCI_CTRL_HCFS) {
375 case OHCI_USB_OPER:
376 /* If no status changes are pending, enable RHSC interrupts. */
377 if (!rhsc_enable && !rhsc_status && !changed) {
378 rhsc_enable = OHCI_INTR_RHSC;
379 ohci_writel(ohci, rhsc_enable, &ohci->regs->intrenable);
380 }
381
382 /* Keep on polling until we know a device is connected
383 * and RHSC is enabled, or until we autostop.
384 */
385 if (!ohci->autostop) {
386 if (any_connected ||
387 !device_may_wakeup(&ohci_to_hcd(ohci)
388 ->self.root_hub->dev)) {
389 if (rhsc_enable)
390 poll_rh = 0;
391 } else {
392 ohci->autostop = 1;
393 ohci->next_statechange = jiffies + HZ;
394 }
395
396 /* if no devices have been attached for one second, autostop */
397 } else {
398 if (changed || any_connected) {
399 ohci->autostop = 0;
400 ohci->next_statechange = jiffies +
401 STATECHANGE_DELAY;
402 } else if (time_after_eq(jiffies,
403 ohci->next_statechange)
404 && !ohci->ed_rm_list
405 && !(ohci->hc_control &
406 OHCI_SCHED_ENABLES)) {
407 ohci_rh_suspend(ohci, 1);
408 if (rhsc_enable)
409 poll_rh = 0;
410 }
411 }
412 break;
413
414 case OHCI_USB_SUSPEND:
415 case OHCI_USB_RESUME:
416 /* if there is a port change, autostart or ask to be resumed */
417 if (changed) {
418 if (ohci->autostop)
419 ohci_rh_resume(ohci);
420 else
421 usb_hcd_resume_root_hub(ohci_to_hcd(ohci));
422
423 /* If remote wakeup is disabled, stop polling */
424 } else if (!ohci->autostop &&
425 !ohci_to_hcd(ohci)->self.root_hub->
426 do_remote_wakeup) {
427 poll_rh = 0;
428
429 } else {
430 /* If no status changes are pending,
431 * enable RHSC interrupts
432 */
433 if (!rhsc_enable && !rhsc_status) {
434 rhsc_enable = OHCI_INTR_RHSC;
435 ohci_writel(ohci, rhsc_enable,
436 &ohci->regs->intrenable);
437 }
438 /* Keep polling until RHSC is enabled */
439 if (rhsc_enable)
440 poll_rh = 0;
441 }
442 break;
443 }
444 return poll_rh;
445 }
446
447 #else /* CONFIG_PM */
448
ohci_rh_resume(struct ohci_hcd * ohci)449 static inline int ohci_rh_resume(struct ohci_hcd *ohci)
450 {
451 return 0;
452 }
453
454 /* Carry out polling-related state changes.
455 * autostop isn't used when CONFIG_PM is turned off.
456 */
ohci_root_hub_state_changes(struct ohci_hcd * ohci,int changed,int any_connected,int rhsc_status)457 static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
458 int any_connected, int rhsc_status)
459 {
460 /* If RHSC is enabled, don't poll */
461 if (ohci_readl(ohci, &ohci->regs->intrenable) & OHCI_INTR_RHSC)
462 return 0;
463
464 /* If status changes are pending, continue polling.
465 * Conversely, if no status changes are pending but the RHSC
466 * status bit was set, then RHSC may be broken so continue polling.
467 */
468 if (changed || rhsc_status)
469 return 1;
470
471 /* It's safe to re-enable RHSC interrupts */
472 ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrenable);
473 return 0;
474 }
475
476 #endif /* CONFIG_PM */
477
478 /*-------------------------------------------------------------------------*/
479
480 /* build "status change" packet (one or two bytes) from HC registers */
481
482 static int
ohci_hub_status_data(struct usb_hcd * hcd,char * buf)483 ohci_hub_status_data (struct usb_hcd *hcd, char *buf)
484 {
485 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
486 int i, changed = 0, length = 1;
487 int any_connected = 0;
488 int rhsc_status;
489 unsigned long flags;
490
491 spin_lock_irqsave (&ohci->lock, flags);
492 if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))
493 goto done;
494
495 /* undocumented erratum seen on at least rev D */
496 if ((ohci->flags & OHCI_QUIRK_AMD756)
497 && (roothub_a (ohci) & RH_A_NDP) > MAX_ROOT_PORTS) {
498 ohci_warn (ohci, "bogus NDP, rereads as NDP=%d\n",
499 ohci_readl (ohci, &ohci->regs->roothub.a) & RH_A_NDP);
500 /* retry later; "should not happen" */
501 goto done;
502 }
503
504 /* init status */
505 if (roothub_status (ohci) & (RH_HS_LPSC | RH_HS_OCIC))
506 buf [0] = changed = 1;
507 else
508 buf [0] = 0;
509 if (ohci->num_ports > 7) {
510 buf [1] = 0;
511 length++;
512 }
513
514 /* Clear the RHSC status flag before reading the port statuses */
515 ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrstatus);
516 rhsc_status = ohci_readl(ohci, &ohci->regs->intrstatus) &
517 OHCI_INTR_RHSC;
518
519 /* look at each port */
520 for (i = 0; i < ohci->num_ports; i++) {
521 u32 status = roothub_portstatus (ohci, i);
522
523 /* can't autostop if ports are connected */
524 any_connected |= (status & RH_PS_CCS);
525
526 if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC
527 | RH_PS_OCIC | RH_PS_PRSC)) {
528 changed = 1;
529 if (i < 7)
530 buf [0] |= 1 << (i + 1);
531 else
532 buf [1] |= 1 << (i - 7);
533 }
534 }
535
536 hcd->poll_rh = ohci_root_hub_state_changes(ohci, changed,
537 any_connected, rhsc_status);
538
539 done:
540 spin_unlock_irqrestore (&ohci->lock, flags);
541
542 return changed ? length : 0;
543 }
544
545 /*-------------------------------------------------------------------------*/
546
547 static void
ohci_hub_descriptor(struct ohci_hcd * ohci,struct usb_hub_descriptor * desc)548 ohci_hub_descriptor (
549 struct ohci_hcd *ohci,
550 struct usb_hub_descriptor *desc
551 ) {
552 u32 rh = roothub_a (ohci);
553 u16 temp;
554
555 desc->bDescriptorType = 0x29;
556 desc->bPwrOn2PwrGood = (rh & RH_A_POTPGT) >> 24;
557 desc->bHubContrCurrent = 0;
558
559 desc->bNbrPorts = ohci->num_ports;
560 temp = 1 + (ohci->num_ports / 8);
561 desc->bDescLength = 7 + 2 * temp;
562
563 temp = 0;
564 if (rh & RH_A_NPS) /* no power switching? */
565 temp |= 0x0002;
566 if (rh & RH_A_PSM) /* per-port power switching? */
567 temp |= 0x0001;
568 if (rh & RH_A_NOCP) /* no overcurrent reporting? */
569 temp |= 0x0010;
570 else if (rh & RH_A_OCPM) /* per-port overcurrent reporting? */
571 temp |= 0x0008;
572 desc->wHubCharacteristics = (__force __u16)cpu_to_hc16(ohci, temp);
573
574 /* two bitmaps: ports removable, and usb 1.0 legacy PortPwrCtrlMask */
575 rh = roothub_b (ohci);
576 memset(desc->bitmap, 0xff, sizeof(desc->bitmap));
577 desc->bitmap [0] = rh & RH_B_DR;
578 if (ohci->num_ports > 7) {
579 desc->bitmap [1] = (rh & RH_B_DR) >> 8;
580 desc->bitmap [2] = 0xff;
581 } else
582 desc->bitmap [1] = 0xff;
583 }
584
585 /*-------------------------------------------------------------------------*/
586
587 #ifdef CONFIG_USB_OTG
588
ohci_start_port_reset(struct usb_hcd * hcd,unsigned port)589 static int ohci_start_port_reset (struct usb_hcd *hcd, unsigned port)
590 {
591 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
592 u32 status;
593
594 if (!port)
595 return -EINVAL;
596 port--;
597
598 /* start port reset before HNP protocol times out */
599 status = ohci_readl(ohci, &ohci->regs->roothub.portstatus [port]);
600 if (!(status & RH_PS_CCS))
601 return -ENODEV;
602
603 /* khubd will finish the reset later */
604 ohci_writel(ohci, RH_PS_PRS, &ohci->regs->roothub.portstatus [port]);
605 return 0;
606 }
607
608 #else
609
610 #define ohci_start_port_reset NULL
611
612 #endif
613
614 /*-------------------------------------------------------------------------*/
615
616
617 /* See usb 7.1.7.5: root hubs must issue at least 50 msec reset signaling,
618 * not necessarily continuous ... to guard against resume signaling.
619 * The short timeout is safe for non-root hubs, and is backward-compatible
620 * with earlier Linux hosts.
621 */
622 #ifdef CONFIG_USB_SUSPEND
623 #define PORT_RESET_MSEC 50
624 #else
625 #define PORT_RESET_MSEC 10
626 #endif
627
628 /* this timer value might be vendor-specific ... */
629 #define PORT_RESET_HW_MSEC 10
630
631 /* wrap-aware logic morphed from <linux/jiffies.h> */
632 #define tick_before(t1,t2) ((s16)(((s16)(t1))-((s16)(t2))) < 0)
633
634 /* called from some task, normally khubd */
root_port_reset(struct ohci_hcd * ohci,unsigned port)635 static inline int root_port_reset (struct ohci_hcd *ohci, unsigned port)
636 {
637 __hc32 __iomem *portstat = &ohci->regs->roothub.portstatus [port];
638 u32 temp = 0;
639 u16 now = ohci_readl(ohci, &ohci->regs->fmnumber);
640 u16 reset_done = now + PORT_RESET_MSEC;
641 int limit_1 = DIV_ROUND_UP(PORT_RESET_MSEC, PORT_RESET_HW_MSEC);
642
643 /* build a "continuous enough" reset signal, with up to
644 * 3msec gap between pulses. scheduler HZ==100 must work;
645 * this might need to be deadline-scheduled.
646 */
647 do {
648 int limit_2;
649
650 /* spin until any current reset finishes */
651 limit_2 = PORT_RESET_HW_MSEC * 2;
652 while (--limit_2 >= 0) {
653 temp = ohci_readl (ohci, portstat);
654 /* handle e.g. CardBus eject */
655 if (temp == ~(u32)0)
656 return -ESHUTDOWN;
657 if (!(temp & RH_PS_PRS))
658 break;
659 udelay (500);
660 }
661
662 /* timeout (a hardware error) has been observed when
663 * EHCI sets CF while this driver is resetting a port;
664 * presumably other disconnect paths might do it too.
665 */
666 if (limit_2 < 0) {
667 ohci_dbg(ohci,
668 "port[%d] reset timeout, stat %08x\n",
669 port, temp);
670 break;
671 }
672
673 if (!(temp & RH_PS_CCS))
674 break;
675 if (temp & RH_PS_PRSC)
676 ohci_writel (ohci, RH_PS_PRSC, portstat);
677
678 /* start the next reset, sleep till it's probably done */
679 ohci_writel (ohci, RH_PS_PRS, portstat);
680 msleep(PORT_RESET_HW_MSEC);
681 now = ohci_readl(ohci, &ohci->regs->fmnumber);
682 } while (tick_before(now, reset_done) && --limit_1 >= 0);
683
684 /* caller synchronizes using PRSC ... and handles PRS
685 * still being set when this returns.
686 */
687
688 return 0;
689 }
690
ohci_hub_control(struct usb_hcd * hcd,u16 typeReq,u16 wValue,u16 wIndex,char * buf,u16 wLength)691 static int ohci_hub_control (
692 struct usb_hcd *hcd,
693 u16 typeReq,
694 u16 wValue,
695 u16 wIndex,
696 char *buf,
697 u16 wLength
698 ) {
699 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
700 int ports = hcd_to_bus (hcd)->root_hub->maxchild;
701 u32 temp;
702 int retval = 0;
703
704 if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
705 return -ESHUTDOWN;
706
707 switch (typeReq) {
708 case ClearHubFeature:
709 switch (wValue) {
710 case C_HUB_OVER_CURRENT:
711 ohci_writel (ohci, RH_HS_OCIC,
712 &ohci->regs->roothub.status);
713 case C_HUB_LOCAL_POWER:
714 break;
715 default:
716 goto error;
717 }
718 break;
719 case ClearPortFeature:
720 if (!wIndex || wIndex > ports)
721 goto error;
722 wIndex--;
723
724 switch (wValue) {
725 case USB_PORT_FEAT_ENABLE:
726 temp = RH_PS_CCS;
727 break;
728 case USB_PORT_FEAT_C_ENABLE:
729 temp = RH_PS_PESC;
730 break;
731 case USB_PORT_FEAT_SUSPEND:
732 temp = RH_PS_POCI;
733 break;
734 case USB_PORT_FEAT_C_SUSPEND:
735 temp = RH_PS_PSSC;
736 break;
737 case USB_PORT_FEAT_POWER:
738 temp = RH_PS_LSDA;
739 break;
740 case USB_PORT_FEAT_C_CONNECTION:
741 temp = RH_PS_CSC;
742 break;
743 case USB_PORT_FEAT_C_OVER_CURRENT:
744 temp = RH_PS_OCIC;
745 break;
746 case USB_PORT_FEAT_C_RESET:
747 temp = RH_PS_PRSC;
748 break;
749 default:
750 goto error;
751 }
752 ohci_writel (ohci, temp,
753 &ohci->regs->roothub.portstatus [wIndex]);
754 // ohci_readl (ohci, &ohci->regs->roothub.portstatus [wIndex]);
755 break;
756 case GetHubDescriptor:
757 ohci_hub_descriptor (ohci, (struct usb_hub_descriptor *) buf);
758 break;
759 case GetHubStatus:
760 temp = roothub_status (ohci) & ~(RH_HS_CRWE | RH_HS_DRWE);
761 put_unaligned_le32(temp, buf);
762 break;
763 case GetPortStatus:
764 if (!wIndex || wIndex > ports)
765 goto error;
766 wIndex--;
767 temp = roothub_portstatus (ohci, wIndex);
768 put_unaligned_le32(temp, buf);
769
770 #ifndef OHCI_VERBOSE_DEBUG
771 if (*(u16*)(buf+2)) /* only if wPortChange is interesting */
772 #endif
773 dbg_port (ohci, "GetStatus", wIndex, temp);
774 break;
775 case SetHubFeature:
776 switch (wValue) {
777 case C_HUB_OVER_CURRENT:
778 // FIXME: this can be cleared, yes?
779 case C_HUB_LOCAL_POWER:
780 break;
781 default:
782 goto error;
783 }
784 break;
785 case SetPortFeature:
786 if (!wIndex || wIndex > ports)
787 goto error;
788 wIndex--;
789 switch (wValue) {
790 case USB_PORT_FEAT_SUSPEND:
791 #ifdef CONFIG_USB_OTG
792 if (hcd->self.otg_port == (wIndex + 1)
793 && hcd->self.b_hnp_enable)
794 ohci->start_hnp(ohci);
795 else
796 #endif
797 ohci_writel (ohci, RH_PS_PSS,
798 &ohci->regs->roothub.portstatus [wIndex]);
799 break;
800 case USB_PORT_FEAT_POWER:
801 ohci_writel (ohci, RH_PS_PPS,
802 &ohci->regs->roothub.portstatus [wIndex]);
803 break;
804 case USB_PORT_FEAT_RESET:
805 retval = root_port_reset (ohci, wIndex);
806 break;
807 default:
808 goto error;
809 }
810 break;
811
812 default:
813 error:
814 /* "protocol stall" on error */
815 retval = -EPIPE;
816 }
817 return retval;
818 }
819
820