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
ohci_rh_suspend(struct ohci_hcd * ohci,int autostop)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
find_head(struct ed * ed)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 */
ohci_rh_resume(struct ohci_hcd * ohci)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
ohci_bus_suspend(struct usb_hcd * hcd)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 ohci->prev_frame_no = IO_WATCHDOG_OFF;
317 }
318 return rc;
319 }
320
ohci_bus_resume(struct usb_hcd * hcd)321 static int ohci_bus_resume (struct usb_hcd *hcd)
322 {
323 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
324 int rc;
325
326 if (time_before (jiffies, ohci->next_statechange))
327 msleep(5);
328
329 spin_lock_irq (&ohci->lock);
330
331 if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
332 rc = -ESHUTDOWN;
333 else
334 rc = ohci_rh_resume (ohci);
335 spin_unlock_irq (&ohci->lock);
336
337 /* poll until we know a device is connected or we autostop */
338 if (rc == 0)
339 usb_hcd_poll_rh_status(hcd);
340 return rc;
341 }
342
343 /* 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)344 static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
345 int any_connected, int rhsc_status)
346 {
347 int poll_rh = 1;
348 int rhsc_enable;
349
350 /* Some broken controllers never turn off RHSC in the interrupt
351 * status register. For their sake we won't re-enable RHSC
352 * interrupts if the interrupt bit is already active.
353 */
354 rhsc_enable = ohci_readl(ohci, &ohci->regs->intrenable) &
355 OHCI_INTR_RHSC;
356
357 switch (ohci->hc_control & OHCI_CTRL_HCFS) {
358 case OHCI_USB_OPER:
359 /* If no status changes are pending, enable RHSC interrupts. */
360 if (!rhsc_enable && !rhsc_status && !changed) {
361 rhsc_enable = OHCI_INTR_RHSC;
362 ohci_writel(ohci, rhsc_enable, &ohci->regs->intrenable);
363 }
364
365 /* Keep on polling until we know a device is connected
366 * and RHSC is enabled, or until we autostop.
367 */
368 if (!ohci->autostop) {
369 if (any_connected ||
370 !device_may_wakeup(&ohci_to_hcd(ohci)
371 ->self.root_hub->dev)) {
372 if (rhsc_enable)
373 poll_rh = 0;
374 } else {
375 ohci->autostop = 1;
376 ohci->next_statechange = jiffies + HZ;
377 }
378
379 /* if no devices have been attached for one second, autostop */
380 } else {
381 if (changed || any_connected) {
382 ohci->autostop = 0;
383 ohci->next_statechange = jiffies +
384 STATECHANGE_DELAY;
385 } else if (time_after_eq(jiffies,
386 ohci->next_statechange)
387 && !ohci->ed_rm_list
388 && !(ohci->hc_control &
389 OHCI_SCHED_ENABLES)) {
390 ohci_rh_suspend(ohci, 1);
391 if (rhsc_enable)
392 poll_rh = 0;
393 }
394 }
395 break;
396
397 case OHCI_USB_SUSPEND:
398 case OHCI_USB_RESUME:
399 /* if there is a port change, autostart or ask to be resumed */
400 if (changed) {
401 if (ohci->autostop)
402 ohci_rh_resume(ohci);
403 else
404 usb_hcd_resume_root_hub(ohci_to_hcd(ohci));
405
406 /* If remote wakeup is disabled, stop polling */
407 } else if (!ohci->autostop &&
408 !ohci_to_hcd(ohci)->self.root_hub->
409 do_remote_wakeup) {
410 poll_rh = 0;
411
412 } else {
413 /* If no status changes are pending,
414 * enable RHSC interrupts
415 */
416 if (!rhsc_enable && !rhsc_status) {
417 rhsc_enable = OHCI_INTR_RHSC;
418 ohci_writel(ohci, rhsc_enable,
419 &ohci->regs->intrenable);
420 }
421 /* Keep polling until RHSC is enabled */
422 if (rhsc_enable)
423 poll_rh = 0;
424 }
425 break;
426 }
427 return poll_rh;
428 }
429
430 #else /* CONFIG_PM */
431
ohci_rh_resume(struct ohci_hcd * ohci)432 static inline int ohci_rh_resume(struct ohci_hcd *ohci)
433 {
434 return 0;
435 }
436
437 /* Carry out polling-related state changes.
438 * autostop isn't used when CONFIG_PM is turned off.
439 */
ohci_root_hub_state_changes(struct ohci_hcd * ohci,int changed,int any_connected,int rhsc_status)440 static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
441 int any_connected, int rhsc_status)
442 {
443 /* If RHSC is enabled, don't poll */
444 if (ohci_readl(ohci, &ohci->regs->intrenable) & OHCI_INTR_RHSC)
445 return 0;
446
447 /* If status changes are pending, continue polling.
448 * Conversely, if no status changes are pending but the RHSC
449 * status bit was set, then RHSC may be broken so continue polling.
450 */
451 if (changed || rhsc_status)
452 return 1;
453
454 /* It's safe to re-enable RHSC interrupts */
455 ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrenable);
456 return 0;
457 }
458
459 #endif /* CONFIG_PM */
460
461 /*-------------------------------------------------------------------------*/
462
463 /* build "status change" packet (one or two bytes) from HC registers */
464
ohci_hub_status_data(struct usb_hcd * hcd,char * buf)465 int ohci_hub_status_data(struct usb_hcd *hcd, char *buf)
466 {
467 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
468 int i, changed = 0, length = 1;
469 int any_connected = 0;
470 int rhsc_status;
471 unsigned long flags;
472
473 spin_lock_irqsave (&ohci->lock, flags);
474 if (!HCD_HW_ACCESSIBLE(hcd))
475 goto done;
476
477 /* undocumented erratum seen on at least rev D */
478 if ((ohci->flags & OHCI_QUIRK_AMD756)
479 && (roothub_a (ohci) & RH_A_NDP) > MAX_ROOT_PORTS) {
480 ohci_warn (ohci, "bogus NDP, rereads as NDP=%d\n",
481 ohci_readl (ohci, &ohci->regs->roothub.a) & RH_A_NDP);
482 /* retry later; "should not happen" */
483 goto done;
484 }
485
486 /* init status */
487 if (roothub_status (ohci) & (RH_HS_LPSC | RH_HS_OCIC))
488 buf [0] = changed = 1;
489 else
490 buf [0] = 0;
491 if (ohci->num_ports > 7) {
492 buf [1] = 0;
493 length++;
494 }
495
496 /* Clear the RHSC status flag before reading the port statuses */
497 ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrstatus);
498 rhsc_status = ohci_readl(ohci, &ohci->regs->intrstatus) &
499 OHCI_INTR_RHSC;
500
501 /* look at each port */
502 for (i = 0; i < ohci->num_ports; i++) {
503 u32 status = roothub_portstatus (ohci, i);
504
505 /* can't autostop if ports are connected */
506 any_connected |= (status & RH_PS_CCS);
507
508 if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC
509 | RH_PS_OCIC | RH_PS_PRSC)) {
510 changed = 1;
511 if (i < 7)
512 buf [0] |= 1 << (i + 1);
513 else
514 buf [1] |= 1 << (i - 7);
515 }
516 }
517
518 if (ohci_root_hub_state_changes(ohci, changed,
519 any_connected, rhsc_status))
520 set_bit(HCD_FLAG_POLL_RH, &hcd->flags);
521 else
522 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
523
524
525 done:
526 spin_unlock_irqrestore (&ohci->lock, flags);
527
528 return changed ? length : 0;
529 }
530 EXPORT_SYMBOL_GPL(ohci_hub_status_data);
531
532 /*-------------------------------------------------------------------------*/
533
534 static void
ohci_hub_descriptor(struct ohci_hcd * ohci,struct usb_hub_descriptor * desc)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 = USB_DT_HUB;
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 = HUB_CHAR_COMMON_LPSM | HUB_CHAR_COMMON_OCPM;
551 if (rh & RH_A_NPS) /* no power switching? */
552 temp |= HUB_CHAR_NO_LPSM;
553 if (rh & RH_A_PSM) /* per-port power switching? */
554 temp |= HUB_CHAR_INDV_PORT_LPSM;
555 if (rh & RH_A_NOCP) /* no overcurrent reporting? */
556 temp |= HUB_CHAR_NO_OCPM;
557 else if (rh & RH_A_OCPM) /* per-port overcurrent reporting? */
558 temp |= HUB_CHAR_INDV_PORT_OCPM;
559 desc->wHubCharacteristics = cpu_to_le16(temp);
560
561 /* ports removable, and usb 1.0 legacy PortPwrCtrlMask */
562 rh = roothub_b (ohci);
563 memset(desc->u.hs.DeviceRemovable, 0xff,
564 sizeof(desc->u.hs.DeviceRemovable));
565 desc->u.hs.DeviceRemovable[0] = rh & RH_B_DR;
566 if (ohci->num_ports > 7) {
567 desc->u.hs.DeviceRemovable[1] = (rh & RH_B_DR) >> 8;
568 desc->u.hs.DeviceRemovable[2] = 0xff;
569 } else
570 desc->u.hs.DeviceRemovable[1] = 0xff;
571 }
572
573 /*-------------------------------------------------------------------------*/
574
575 #ifdef CONFIG_USB_OTG
576
ohci_start_port_reset(struct usb_hcd * hcd,unsigned port)577 static int ohci_start_port_reset (struct usb_hcd *hcd, unsigned port)
578 {
579 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
580 u32 status;
581
582 if (!port)
583 return -EINVAL;
584 port--;
585
586 /* start port reset before HNP protocol times out */
587 status = ohci_readl(ohci, &ohci->regs->roothub.portstatus [port]);
588 if (!(status & RH_PS_CCS))
589 return -ENODEV;
590
591 /* hub_wq will finish the reset later */
592 ohci_writel(ohci, RH_PS_PRS, &ohci->regs->roothub.portstatus [port]);
593 return 0;
594 }
595
596 #else
597
598 #define ohci_start_port_reset NULL
599
600 #endif
601
602 /*-------------------------------------------------------------------------*/
603
604
605 /* See usb 7.1.7.5: root hubs must issue at least 50 msec reset signaling,
606 * not necessarily continuous ... to guard against resume signaling.
607 */
608 #define PORT_RESET_MSEC 50
609
610 /* this timer value might be vendor-specific ... */
611 #define PORT_RESET_HW_MSEC 10
612
613 /* wrap-aware logic morphed from <linux/jiffies.h> */
614 #define tick_before(t1,t2) ((s16)(((s16)(t1))-((s16)(t2))) < 0)
615
616 /* called from some task, normally hub_wq */
root_port_reset(struct ohci_hcd * ohci,unsigned port)617 static inline int root_port_reset (struct ohci_hcd *ohci, unsigned port)
618 {
619 __hc32 __iomem *portstat = &ohci->regs->roothub.portstatus [port];
620 u32 temp = 0;
621 u16 now = ohci_readl(ohci, &ohci->regs->fmnumber);
622 u16 reset_done = now + PORT_RESET_MSEC;
623 int limit_1 = DIV_ROUND_UP(PORT_RESET_MSEC, PORT_RESET_HW_MSEC);
624
625 /* build a "continuous enough" reset signal, with up to
626 * 3msec gap between pulses. scheduler HZ==100 must work;
627 * this might need to be deadline-scheduled.
628 */
629 do {
630 int limit_2;
631
632 /* spin until any current reset finishes */
633 limit_2 = PORT_RESET_HW_MSEC * 2;
634 while (--limit_2 >= 0) {
635 temp = ohci_readl (ohci, portstat);
636 /* handle e.g. CardBus eject */
637 if (temp == ~(u32)0)
638 return -ESHUTDOWN;
639 if (!(temp & RH_PS_PRS))
640 break;
641 udelay (500);
642 }
643
644 /* timeout (a hardware error) has been observed when
645 * EHCI sets CF while this driver is resetting a port;
646 * presumably other disconnect paths might do it too.
647 */
648 if (limit_2 < 0) {
649 ohci_dbg(ohci,
650 "port[%d] reset timeout, stat %08x\n",
651 port, temp);
652 break;
653 }
654
655 if (!(temp & RH_PS_CCS))
656 break;
657 if (temp & RH_PS_PRSC)
658 ohci_writel (ohci, RH_PS_PRSC, portstat);
659
660 /* start the next reset, sleep till it's probably done */
661 ohci_writel (ohci, RH_PS_PRS, portstat);
662 msleep(PORT_RESET_HW_MSEC);
663 now = ohci_readl(ohci, &ohci->regs->fmnumber);
664 } while (tick_before(now, reset_done) && --limit_1 >= 0);
665
666 /* caller synchronizes using PRSC ... and handles PRS
667 * still being set when this returns.
668 */
669
670 return 0;
671 }
672
ohci_hub_control(struct usb_hcd * hcd,u16 typeReq,u16 wValue,u16 wIndex,char * buf,u16 wLength)673 int ohci_hub_control(
674 struct usb_hcd *hcd,
675 u16 typeReq,
676 u16 wValue,
677 u16 wIndex,
678 char *buf,
679 u16 wLength
680 ) {
681 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
682 int ports = ohci->num_ports;
683 u32 temp;
684 int retval = 0;
685
686 if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
687 return -ESHUTDOWN;
688
689 switch (typeReq) {
690 case ClearHubFeature:
691 switch (wValue) {
692 case C_HUB_OVER_CURRENT:
693 ohci_writel (ohci, RH_HS_OCIC,
694 &ohci->regs->roothub.status);
695 case C_HUB_LOCAL_POWER:
696 break;
697 default:
698 goto error;
699 }
700 break;
701 case ClearPortFeature:
702 if (!wIndex || wIndex > ports)
703 goto error;
704 wIndex--;
705
706 switch (wValue) {
707 case USB_PORT_FEAT_ENABLE:
708 temp = RH_PS_CCS;
709 break;
710 case USB_PORT_FEAT_C_ENABLE:
711 temp = RH_PS_PESC;
712 break;
713 case USB_PORT_FEAT_SUSPEND:
714 temp = RH_PS_POCI;
715 break;
716 case USB_PORT_FEAT_C_SUSPEND:
717 temp = RH_PS_PSSC;
718 break;
719 case USB_PORT_FEAT_POWER:
720 temp = RH_PS_LSDA;
721 break;
722 case USB_PORT_FEAT_C_CONNECTION:
723 temp = RH_PS_CSC;
724 break;
725 case USB_PORT_FEAT_C_OVER_CURRENT:
726 temp = RH_PS_OCIC;
727 break;
728 case USB_PORT_FEAT_C_RESET:
729 temp = RH_PS_PRSC;
730 break;
731 default:
732 goto error;
733 }
734 ohci_writel (ohci, temp,
735 &ohci->regs->roothub.portstatus [wIndex]);
736 // ohci_readl (ohci, &ohci->regs->roothub.portstatus [wIndex]);
737 break;
738 case GetHubDescriptor:
739 ohci_hub_descriptor (ohci, (struct usb_hub_descriptor *) buf);
740 break;
741 case GetHubStatus:
742 temp = roothub_status (ohci) & ~(RH_HS_CRWE | RH_HS_DRWE);
743 put_unaligned_le32(temp, buf);
744 break;
745 case GetPortStatus:
746 if (!wIndex || wIndex > ports)
747 goto error;
748 wIndex--;
749 temp = roothub_portstatus (ohci, wIndex);
750 put_unaligned_le32(temp, buf);
751
752 if (*(u16*)(buf+2)) /* only if wPortChange is interesting */
753 dbg_port(ohci, "GetStatus", wIndex, temp);
754 break;
755 case SetHubFeature:
756 switch (wValue) {
757 case C_HUB_OVER_CURRENT:
758 // FIXME: this can be cleared, yes?
759 case C_HUB_LOCAL_POWER:
760 break;
761 default:
762 goto error;
763 }
764 break;
765 case SetPortFeature:
766 if (!wIndex || wIndex > ports)
767 goto error;
768 wIndex--;
769 switch (wValue) {
770 case USB_PORT_FEAT_SUSPEND:
771 #ifdef CONFIG_USB_OTG
772 if (hcd->self.otg_port == (wIndex + 1)
773 && hcd->self.b_hnp_enable)
774 ohci->start_hnp(ohci);
775 else
776 #endif
777 ohci_writel (ohci, RH_PS_PSS,
778 &ohci->regs->roothub.portstatus [wIndex]);
779 break;
780 case USB_PORT_FEAT_POWER:
781 ohci_writel (ohci, RH_PS_PPS,
782 &ohci->regs->roothub.portstatus [wIndex]);
783 break;
784 case USB_PORT_FEAT_RESET:
785 retval = root_port_reset (ohci, wIndex);
786 break;
787 default:
788 goto error;
789 }
790 break;
791
792 default:
793 error:
794 /* "protocol stall" on error */
795 retval = -EPIPE;
796 }
797 return retval;
798 }
799 EXPORT_SYMBOL_GPL(ohci_hub_control);
800
