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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
43static void update_done_list(struct ohci_hcd *);
44static void ohci_work(struct ohci_hcd *);
45
46#ifdef CONFIG_PM
47static 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 fallthrough;
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 /* All ED unlinks should be finished, no need for SOF interrupts */
95 ohci_writel(ohci, OHCI_INTR_SF, &ohci->regs->intrdisable);
96
97 /*
98 * Some controllers don't handle "global" suspend properly if
99 * there are unsuspended ports. For these controllers, put all
100 * the enabled ports into suspend before suspending the root hub.
101 */
102 if (ohci->flags & OHCI_QUIRK_GLOBAL_SUSPEND) {
103 __hc32 __iomem *portstat = ohci->regs->roothub.portstatus;
104 int i;
105 unsigned temp;
106
107 for (i = 0; i < ohci->num_ports; (++i, ++portstat)) {
108 temp = ohci_readl(ohci, portstat);
109 if ((temp & (RH_PS_PES | RH_PS_PSS)) ==
110 RH_PS_PES)
111 ohci_writel(ohci, RH_PS_PSS, portstat);
112 }
113 }
114
115 /* maybe resume can wake root hub */
116 if (ohci_to_hcd(ohci)->self.root_hub->do_remote_wakeup || autostop) {
117 ohci->hc_control |= OHCI_CTRL_RWE;
118 } else {
119 ohci_writel(ohci, OHCI_INTR_RHSC | OHCI_INTR_RD,
120 &ohci->regs->intrdisable);
121 ohci->hc_control &= ~OHCI_CTRL_RWE;
122 }
123
124 /* Suspend hub ... this is the "global (to this bus) suspend" mode,
125 * which doesn't imply ports will first be individually suspended.
126 */
127 ohci->hc_control &= ~OHCI_CTRL_HCFS;
128 ohci->hc_control |= OHCI_USB_SUSPEND;
129 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
130 (void) ohci_readl (ohci, &ohci->regs->control);
131
132 /* no resumes until devices finish suspending */
133 if (!autostop) {
134 ohci->next_statechange = jiffies + msecs_to_jiffies (5);
135 ohci->autostop = 0;
136 ohci->rh_state = OHCI_RH_SUSPENDED;
137 }
138
139done:
140 return status;
141}
142
143static inline struct ed *find_head (struct ed *ed)
144{
145 /* for bulk and control lists */
146 while (ed->ed_prev)
147 ed = ed->ed_prev;
148 return ed;
149}
150
151/* caller has locked the root hub */
152static int ohci_rh_resume (struct ohci_hcd *ohci)
153__releases(ohci->lock)
154__acquires(ohci->lock)
155{
156 struct usb_hcd *hcd = ohci_to_hcd (ohci);
157 u32 temp, enables;
158 int status = -EINPROGRESS;
159 int autostopped = ohci->autostop;
160
161 ohci->autostop = 0;
162 ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
163
164 if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) {
165 /* this can happen after resuming a swsusp snapshot */
166 if (ohci->rh_state != OHCI_RH_RUNNING) {
167 ohci_dbg (ohci, "BIOS/SMM active, control %03x\n",
168 ohci->hc_control);
169 status = -EBUSY;
170 /* this happens when pmcore resumes HC then root */
171 } else {
172 ohci_dbg (ohci, "duplicate resume\n");
173 status = 0;
174 }
175 } else switch (ohci->hc_control & OHCI_CTRL_HCFS) {
176 case OHCI_USB_SUSPEND:
177 ohci->hc_control &= ~(OHCI_CTRL_HCFS|OHCI_SCHED_ENABLES);
178 ohci->hc_control |= OHCI_USB_RESUME;
179 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
180 (void) ohci_readl (ohci, &ohci->regs->control);
181 ohci_dbg (ohci, "%s root hub\n",
182 autostopped ? "auto-start" : "resume");
183 break;
184 case OHCI_USB_RESUME:
185 /* HCFS changes sometime after INTR_RD */
186 ohci_dbg(ohci, "%swakeup root hub\n",
187 autostopped ? "auto-" : "");
188 break;
189 case OHCI_USB_OPER:
190 /* this can happen after resuming a swsusp snapshot */
191 ohci_dbg (ohci, "snapshot resume? reinit\n");
192 status = -EBUSY;
193 break;
194 default: /* RESET, we lost power */
195 ohci_dbg (ohci, "lost power\n");
196 status = -EBUSY;
197 }
198 if (status == -EBUSY) {
199 if (!autostopped) {
200 spin_unlock_irq (&ohci->lock);
201 status = ohci_restart (ohci);
202
203 usb_root_hub_lost_power(hcd->self.root_hub);
204
205 spin_lock_irq (&ohci->lock);
206 }
207 return status;
208 }
209 if (status != -EINPROGRESS)
210 return status;
211 if (autostopped)
212 goto skip_resume;
213 spin_unlock_irq (&ohci->lock);
214
215 /* Some controllers (lucent erratum) need extra-long delays */
216 msleep (20 /* usb 11.5.1.10 */ + 12 /* 32 msec counter */ + 1);
217
218 temp = ohci_readl (ohci, &ohci->regs->control);
219 temp &= OHCI_CTRL_HCFS;
220 if (temp != OHCI_USB_RESUME) {
221 ohci_err (ohci, "controller won't resume\n");
222 spin_lock_irq(&ohci->lock);
223 return -EBUSY;
224 }
225
226 /* disable old schedule state, reinit from scratch */
227 ohci_writel (ohci, 0, &ohci->regs->ed_controlhead);
228 ohci_writel (ohci, 0, &ohci->regs->ed_controlcurrent);
229 ohci_writel (ohci, 0, &ohci->regs->ed_bulkhead);
230 ohci_writel (ohci, 0, &ohci->regs->ed_bulkcurrent);
231 ohci_writel (ohci, 0, &ohci->regs->ed_periodcurrent);
232 ohci_writel (ohci, (u32) ohci->hcca_dma, &ohci->regs->hcca);
233
234 /* Sometimes PCI D3 suspend trashes frame timings ... */
235 periodic_reinit (ohci);
236
237 /*
238 * The following code is executed with ohci->lock held and
239 * irqs disabled if and only if autostopped is true. This
240 * will cause sparse to warn about a "context imbalance".
241 */
242skip_resume:
243 /* interrupts might have been disabled */
244 ohci_writel (ohci, OHCI_INTR_INIT, &ohci->regs->intrenable);
245 if (ohci->ed_rm_list)
246 ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrenable);
247
248 /* Then re-enable operations */
249 ohci_writel (ohci, OHCI_USB_OPER, &ohci->regs->control);
250 (void) ohci_readl (ohci, &ohci->regs->control);
251 if (!autostopped)
252 msleep (3);
253
254 temp = ohci->hc_control;
255 temp &= OHCI_CTRL_RWC;
256 temp |= OHCI_CONTROL_INIT | OHCI_USB_OPER;
257 ohci->hc_control = temp;
258 ohci_writel (ohci, temp, &ohci->regs->control);
259 (void) ohci_readl (ohci, &ohci->regs->control);
260
261 /* TRSMRCY */
262 if (!autostopped) {
263 msleep (10);
264 spin_lock_irq (&ohci->lock);
265 }
266 /* now ohci->lock is always held and irqs are always disabled */
267
268 /* keep it alive for more than ~5x suspend + resume costs */
269 ohci->next_statechange = jiffies + STATECHANGE_DELAY;
270
271 /* maybe turn schedules back on */
272 enables = 0;
273 temp = 0;
274 if (!ohci->ed_rm_list) {
275 if (ohci->ed_controltail) {
276 ohci_writel (ohci,
277 find_head (ohci->ed_controltail)->dma,
278 &ohci->regs->ed_controlhead);
279 enables |= OHCI_CTRL_CLE;
280 temp |= OHCI_CLF;
281 }
282 if (ohci->ed_bulktail) {
283 ohci_writel (ohci, find_head (ohci->ed_bulktail)->dma,
284 &ohci->regs->ed_bulkhead);
285 enables |= OHCI_CTRL_BLE;
286 temp |= OHCI_BLF;
287 }
288 }
289 if (hcd->self.bandwidth_isoc_reqs || hcd->self.bandwidth_int_reqs)
290 enables |= OHCI_CTRL_PLE|OHCI_CTRL_IE;
291 if (enables) {
292 ohci_dbg (ohci, "restarting schedules ... %08x\n", enables);
293 ohci->hc_control |= enables;
294 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
295 if (temp)
296 ohci_writel (ohci, temp, &ohci->regs->cmdstatus);
297 (void) ohci_readl (ohci, &ohci->regs->control);
298 }
299
300 ohci->rh_state = OHCI_RH_RUNNING;
301 return 0;
302}
303
304static int ohci_bus_suspend (struct usb_hcd *hcd)
305{
306 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
307 int rc;
308
309 spin_lock_irq (&ohci->lock);
310
311 if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
312 rc = -ESHUTDOWN;
313 else
314 rc = ohci_rh_suspend (ohci, 0);
315 spin_unlock_irq (&ohci->lock);
316
317 if (rc == 0) {
318 del_timer_sync(&ohci->io_watchdog);
319 ohci->prev_frame_no = IO_WATCHDOG_OFF;
320 }
321 return rc;
322}
323
324static int ohci_bus_resume (struct usb_hcd *hcd)
325{
326 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
327 int rc;
328
329 if (time_before (jiffies, ohci->next_statechange))
330 msleep(5);
331
332 spin_lock_irq (&ohci->lock);
333
334 if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
335 rc = -ESHUTDOWN;
336 else
337 rc = ohci_rh_resume (ohci);
338 spin_unlock_irq (&ohci->lock);
339
340 /* poll until we know a device is connected or we autostop */
341 if (rc == 0)
342 usb_hcd_poll_rh_status(hcd);
343 return rc;
344}
345
346/* Carry out polling-, autostop-, and autoresume-related state changes */
347static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
348 int any_connected, int rhsc_status)
349{
350 int poll_rh = 1;
351 int rhsc_enable;
352
353 /* Some broken controllers never turn off RHSC in the interrupt
354 * status register. For their sake we won't re-enable RHSC
355 * interrupts if the interrupt bit is already active.
356 */
357 rhsc_enable = ohci_readl(ohci, &ohci->regs->intrenable) &
358 OHCI_INTR_RHSC;
359
360 switch (ohci->hc_control & OHCI_CTRL_HCFS) {
361 case OHCI_USB_OPER:
362 /* If no status changes are pending, enable RHSC interrupts. */
363 if (!rhsc_enable && !rhsc_status && !changed) {
364 rhsc_enable = OHCI_INTR_RHSC;
365 ohci_writel(ohci, rhsc_enable, &ohci->regs->intrenable);
366 }
367
368 /* Keep on polling until we know a device is connected
369 * and RHSC is enabled, or until we autostop.
370 */
371 if (!ohci->autostop) {
372 if (any_connected ||
373 !device_may_wakeup(&ohci_to_hcd(ohci)
374 ->self.root_hub->dev)) {
375 if (rhsc_enable)
376 poll_rh = 0;
377 } else {
378 ohci->autostop = 1;
379 ohci->next_statechange = jiffies + HZ;
380 }
381
382 /* if no devices have been attached for one second, autostop */
383 } else {
384 if (changed || any_connected) {
385 ohci->autostop = 0;
386 ohci->next_statechange = jiffies +
387 STATECHANGE_DELAY;
388 } else if (time_after_eq(jiffies,
389 ohci->next_statechange)
390 && !ohci->ed_rm_list
391 && !(ohci->hc_control &
392 OHCI_SCHED_ENABLES)) {
393 ohci_rh_suspend(ohci, 1);
394 if (rhsc_enable)
395 poll_rh = 0;
396 }
397 }
398 break;
399
400 case OHCI_USB_SUSPEND:
401 case OHCI_USB_RESUME:
402 /* if there is a port change, autostart or ask to be resumed */
403 if (changed) {
404 if (ohci->autostop)
405 ohci_rh_resume(ohci);
406 else
407 usb_hcd_resume_root_hub(ohci_to_hcd(ohci));
408
409 /* If remote wakeup is disabled, stop polling */
410 } else if (!ohci->autostop &&
411 !ohci_to_hcd(ohci)->self.root_hub->
412 do_remote_wakeup) {
413 poll_rh = 0;
414
415 } else {
416 /* If no status changes are pending,
417 * enable RHSC interrupts
418 */
419 if (!rhsc_enable && !rhsc_status) {
420 rhsc_enable = OHCI_INTR_RHSC;
421 ohci_writel(ohci, rhsc_enable,
422 &ohci->regs->intrenable);
423 }
424 /* Keep polling until RHSC is enabled */
425 if (rhsc_enable)
426 poll_rh = 0;
427 }
428 break;
429 }
430 return poll_rh;
431}
432
433#else /* CONFIG_PM */
434
435static inline int ohci_rh_resume(struct ohci_hcd *ohci)
436{
437 return 0;
438}
439
440/* Carry out polling-related state changes.
441 * autostop isn't used when CONFIG_PM is turned off.
442 */
443static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
444 int any_connected, int rhsc_status)
445{
446 /* If RHSC is enabled, don't poll */
447 if (ohci_readl(ohci, &ohci->regs->intrenable) & OHCI_INTR_RHSC)
448 return 0;
449
450 /* If status changes are pending, continue polling.
451 * Conversely, if no status changes are pending but the RHSC
452 * status bit was set, then RHSC may be broken so continue polling.
453 */
454 if (changed || rhsc_status)
455 return 1;
456
457 /* It's safe to re-enable RHSC interrupts */
458 ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrenable);
459 return 0;
460}
461
462#endif /* CONFIG_PM */
463
464/*-------------------------------------------------------------------------*/
465
466/* build "status change" packet (one or two bytes) from HC registers */
467
468int ohci_hub_status_data(struct usb_hcd *hcd, char *buf)
469{
470 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
471 int i, changed = 0, length = 1;
472 int any_connected = 0;
473 int rhsc_status;
474 unsigned long flags;
475
476 spin_lock_irqsave (&ohci->lock, flags);
477 if (!HCD_HW_ACCESSIBLE(hcd))
478 goto done;
479
480 /* undocumented erratum seen on at least rev D */
481 if ((ohci->flags & OHCI_QUIRK_AMD756)
482 && (roothub_a (ohci) & RH_A_NDP) > MAX_ROOT_PORTS) {
483 ohci_warn (ohci, "bogus NDP, rereads as NDP=%d\n",
484 ohci_readl (ohci, &ohci->regs->roothub.a) & RH_A_NDP);
485 /* retry later; "should not happen" */
486 goto done;
487 }
488
489 /* init status */
490 if (roothub_status (ohci) & (RH_HS_LPSC | RH_HS_OCIC))
491 buf [0] = changed = 1;
492 else
493 buf [0] = 0;
494 if (ohci->num_ports > 7) {
495 buf [1] = 0;
496 length++;
497 }
498
499 /* Clear the RHSC status flag before reading the port statuses */
500 ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrstatus);
501 rhsc_status = ohci_readl(ohci, &ohci->regs->intrstatus) &
502 OHCI_INTR_RHSC;
503
504 /* look at each port */
505 for (i = 0; i < ohci->num_ports; i++) {
506 u32 status = roothub_portstatus (ohci, i);
507
508 /* can't autostop if ports are connected */
509 any_connected |= (status & RH_PS_CCS);
510
511 if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC
512 | RH_PS_OCIC | RH_PS_PRSC)) {
513 changed = 1;
514 if (i < 7)
515 buf [0] |= 1 << (i + 1);
516 else
517 buf [1] |= 1 << (i - 7);
518 }
519 }
520
521 if (ohci_root_hub_state_changes(ohci, changed,
522 any_connected, rhsc_status))
523 set_bit(HCD_FLAG_POLL_RH, &hcd->flags);
524 else
525 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
526
527
528done:
529 spin_unlock_irqrestore (&ohci->lock, flags);
530
531 return changed ? length : 0;
532}
533EXPORT_SYMBOL_GPL(ohci_hub_status_data);
534
535/*-------------------------------------------------------------------------*/
536
537static void
538ohci_hub_descriptor (
539 struct ohci_hcd *ohci,
540 struct usb_hub_descriptor *desc
541) {
542 u32 rh = roothub_a (ohci);
543 u16 temp;
544
545 desc->bDescriptorType = USB_DT_HUB;
546 desc->bPwrOn2PwrGood = (rh & RH_A_POTPGT) >> 24;
547 desc->bHubContrCurrent = 0;
548
549 desc->bNbrPorts = ohci->num_ports;
550 temp = 1 + (ohci->num_ports / 8);
551 desc->bDescLength = 7 + 2 * temp;
552
553 temp = HUB_CHAR_COMMON_LPSM | HUB_CHAR_COMMON_OCPM;
554 if (rh & RH_A_NPS) /* no power switching? */
555 temp |= HUB_CHAR_NO_LPSM;
556 if (rh & RH_A_PSM) /* per-port power switching? */
557 temp |= HUB_CHAR_INDV_PORT_LPSM;
558 if (rh & RH_A_NOCP) /* no overcurrent reporting? */
559 temp |= HUB_CHAR_NO_OCPM;
560 else if (rh & RH_A_OCPM) /* per-port overcurrent reporting? */
561 temp |= HUB_CHAR_INDV_PORT_OCPM;
562 desc->wHubCharacteristics = cpu_to_le16(temp);
563
564 /* ports removable, and usb 1.0 legacy PortPwrCtrlMask */
565 rh = roothub_b (ohci);
566 memset(desc->u.hs.DeviceRemovable, 0xff,
567 sizeof(desc->u.hs.DeviceRemovable));
568 desc->u.hs.DeviceRemovable[0] = rh & RH_B_DR;
569 if (ohci->num_ports > 7) {
570 desc->u.hs.DeviceRemovable[1] = (rh & RH_B_DR) >> 8;
571 desc->u.hs.DeviceRemovable[2] = 0xff;
572 } else
573 desc->u.hs.DeviceRemovable[1] = 0xff;
574}
575
576/*-------------------------------------------------------------------------*/
577
578#ifdef CONFIG_USB_OTG
579
580static int ohci_start_port_reset (struct usb_hcd *hcd, unsigned port)
581{
582 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
583 u32 status;
584
585 if (!port)
586 return -EINVAL;
587 port--;
588
589 /* start port reset before HNP protocol times out */
590 status = ohci_readl(ohci, &ohci->regs->roothub.portstatus [port]);
591 if (!(status & RH_PS_CCS))
592 return -ENODEV;
593
594 /* hub_wq will finish the reset later */
595 ohci_writel(ohci, RH_PS_PRS, &ohci->regs->roothub.portstatus [port]);
596 return 0;
597}
598
599#else
600
601#define ohci_start_port_reset NULL
602
603#endif
604
605/*-------------------------------------------------------------------------*/
606
607
608/* See usb 7.1.7.5: root hubs must issue at least 50 msec reset signaling,
609 * not necessarily continuous ... to guard against resume signaling.
610 */
611#define PORT_RESET_MSEC 50
612
613/* this timer value might be vendor-specific ... */
614#define PORT_RESET_HW_MSEC 10
615
616/* wrap-aware logic morphed from <linux/jiffies.h> */
617#define tick_before(t1,t2) ((s16)(((s16)(t1))-((s16)(t2))) < 0)
618
619/* called from some task, normally hub_wq */
620static inline int root_port_reset (struct ohci_hcd *ohci, unsigned port)
621{
622 __hc32 __iomem *portstat = &ohci->regs->roothub.portstatus [port];
623 u32 temp = 0;
624 u16 now = ohci_readl(ohci, &ohci->regs->fmnumber);
625 u16 reset_done = now + PORT_RESET_MSEC;
626 int limit_1 = DIV_ROUND_UP(PORT_RESET_MSEC, PORT_RESET_HW_MSEC);
627
628 /* build a "continuous enough" reset signal, with up to
629 * 3msec gap between pulses. scheduler HZ==100 must work;
630 * this might need to be deadline-scheduled.
631 */
632 do {
633 int limit_2;
634
635 /* spin until any current reset finishes */
636 limit_2 = PORT_RESET_HW_MSEC * 2;
637 while (--limit_2 >= 0) {
638 temp = ohci_readl (ohci, portstat);
639 /* handle e.g. CardBus eject */
640 if (temp == ~(u32)0)
641 return -ESHUTDOWN;
642 if (!(temp & RH_PS_PRS))
643 break;
644 udelay (500);
645 }
646
647 /* timeout (a hardware error) has been observed when
648 * EHCI sets CF while this driver is resetting a port;
649 * presumably other disconnect paths might do it too.
650 */
651 if (limit_2 < 0) {
652 ohci_dbg(ohci,
653 "port[%d] reset timeout, stat %08x\n",
654 port, temp);
655 break;
656 }
657
658 if (!(temp & RH_PS_CCS))
659 break;
660 if (temp & RH_PS_PRSC)
661 ohci_writel (ohci, RH_PS_PRSC, portstat);
662
663 /* start the next reset, sleep till it's probably done */
664 ohci_writel (ohci, RH_PS_PRS, portstat);
665 msleep(PORT_RESET_HW_MSEC);
666 now = ohci_readl(ohci, &ohci->regs->fmnumber);
667 } while (tick_before(now, reset_done) && --limit_1 >= 0);
668
669 /* caller synchronizes using PRSC ... and handles PRS
670 * still being set when this returns.
671 */
672
673 return 0;
674}
675
676int ohci_hub_control(
677 struct usb_hcd *hcd,
678 u16 typeReq,
679 u16 wValue,
680 u16 wIndex,
681 char *buf,
682 u16 wLength
683) {
684 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
685 int ports = ohci->num_ports;
686 u32 temp;
687 int retval = 0;
688
689 if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
690 return -ESHUTDOWN;
691
692 switch (typeReq) {
693 case ClearHubFeature:
694 switch (wValue) {
695 case C_HUB_OVER_CURRENT:
696 ohci_writel (ohci, RH_HS_OCIC,
697 &ohci->regs->roothub.status);
698 break;
699 case C_HUB_LOCAL_POWER:
700 break;
701 default:
702 goto error;
703 }
704 break;
705 case ClearPortFeature:
706 if (!wIndex || wIndex > ports)
707 goto error;
708 wIndex--;
709
710 switch (wValue) {
711 case USB_PORT_FEAT_ENABLE:
712 temp = RH_PS_CCS;
713 break;
714 case USB_PORT_FEAT_C_ENABLE:
715 temp = RH_PS_PESC;
716 break;
717 case USB_PORT_FEAT_SUSPEND:
718 temp = RH_PS_POCI;
719 break;
720 case USB_PORT_FEAT_C_SUSPEND:
721 temp = RH_PS_PSSC;
722 break;
723 case USB_PORT_FEAT_POWER:
724 temp = RH_PS_LSDA;
725 break;
726 case USB_PORT_FEAT_C_CONNECTION:
727 temp = RH_PS_CSC;
728 break;
729 case USB_PORT_FEAT_C_OVER_CURRENT:
730 temp = RH_PS_OCIC;
731 break;
732 case USB_PORT_FEAT_C_RESET:
733 temp = RH_PS_PRSC;
734 break;
735 default:
736 goto error;
737 }
738 ohci_writel (ohci, temp,
739 &ohci->regs->roothub.portstatus [wIndex]);
740 // ohci_readl (ohci, &ohci->regs->roothub.portstatus [wIndex]);
741 break;
742 case GetHubDescriptor:
743 ohci_hub_descriptor (ohci, (struct usb_hub_descriptor *) buf);
744 break;
745 case GetHubStatus:
746 temp = roothub_status (ohci) & ~(RH_HS_CRWE | RH_HS_DRWE);
747 put_unaligned_le32(temp, buf);
748 break;
749 case GetPortStatus:
750 if (!wIndex || wIndex > ports)
751 goto error;
752 wIndex--;
753 temp = roothub_portstatus (ohci, wIndex);
754 put_unaligned_le32(temp, buf);
755
756 if (*(u16*)(buf+2)) /* only if wPortChange is interesting */
757 dbg_port(ohci, "GetStatus", wIndex, temp);
758 break;
759 case SetHubFeature:
760 switch (wValue) {
761 case C_HUB_OVER_CURRENT:
762 // FIXME: this can be cleared, yes?
763 case C_HUB_LOCAL_POWER:
764 break;
765 default:
766 goto error;
767 }
768 break;
769 case SetPortFeature:
770 if (!wIndex || wIndex > ports)
771 goto error;
772 wIndex--;
773 switch (wValue) {
774 case USB_PORT_FEAT_SUSPEND:
775#ifdef CONFIG_USB_OTG
776 if (hcd->self.otg_port == (wIndex + 1)
777 && hcd->self.b_hnp_enable)
778 ohci->start_hnp(ohci);
779 else
780#endif
781 ohci_writel (ohci, RH_PS_PSS,
782 &ohci->regs->roothub.portstatus [wIndex]);
783 break;
784 case USB_PORT_FEAT_POWER:
785 ohci_writel (ohci, RH_PS_PPS,
786 &ohci->regs->roothub.portstatus [wIndex]);
787 break;
788 case USB_PORT_FEAT_RESET:
789 retval = root_port_reset (ohci, wIndex);
790 break;
791 default:
792 goto error;
793 }
794 break;
795
796 default:
797error:
798 /* "protocol stall" on error */
799 retval = -EPIPE;
800 }
801 return retval;
802}
803EXPORT_SYMBOL_GPL(ohci_hub_control);
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
42static void dl_done_list (struct ohci_hcd *);
43static void finish_unlinks (struct ohci_hcd *, u16);
44
45#ifdef CONFIG_PM
46static 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 /*
94 * Some controllers don't handle "global" suspend properly if
95 * there are unsuspended ports. For these controllers, put all
96 * the enabled ports into suspend before suspending the root hub.
97 */
98 if (ohci->flags & OHCI_QUIRK_GLOBAL_SUSPEND) {
99 __hc32 __iomem *portstat = ohci->regs->roothub.portstatus;
100 int i;
101 unsigned temp;
102
103 for (i = 0; i < ohci->num_ports; (++i, ++portstat)) {
104 temp = ohci_readl(ohci, portstat);
105 if ((temp & (RH_PS_PES | RH_PS_PSS)) ==
106 RH_PS_PES)
107 ohci_writel(ohci, RH_PS_PSS, portstat);
108 }
109 }
110
111 /* maybe resume can wake root hub */
112 if (ohci_to_hcd(ohci)->self.root_hub->do_remote_wakeup || autostop) {
113 ohci->hc_control |= OHCI_CTRL_RWE;
114 } else {
115 ohci_writel(ohci, OHCI_INTR_RHSC | OHCI_INTR_RD,
116 &ohci->regs->intrdisable);
117 ohci->hc_control &= ~OHCI_CTRL_RWE;
118 }
119
120 /* Suspend hub ... this is the "global (to this bus) suspend" mode,
121 * which doesn't imply ports will first be individually suspended.
122 */
123 ohci->hc_control &= ~OHCI_CTRL_HCFS;
124 ohci->hc_control |= OHCI_USB_SUSPEND;
125 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
126 (void) ohci_readl (ohci, &ohci->regs->control);
127
128 /* no resumes until devices finish suspending */
129 if (!autostop) {
130 ohci->next_statechange = jiffies + msecs_to_jiffies (5);
131 ohci->autostop = 0;
132 ohci->rh_state = OHCI_RH_SUSPENDED;
133 }
134
135done:
136 return status;
137}
138
139static inline struct ed *find_head (struct ed *ed)
140{
141 /* for bulk and control lists */
142 while (ed->ed_prev)
143 ed = ed->ed_prev;
144 return ed;
145}
146
147/* caller has locked the root hub */
148static int ohci_rh_resume (struct ohci_hcd *ohci)
149__releases(ohci->lock)
150__acquires(ohci->lock)
151{
152 struct usb_hcd *hcd = ohci_to_hcd (ohci);
153 u32 temp, enables;
154 int status = -EINPROGRESS;
155 int autostopped = ohci->autostop;
156
157 ohci->autostop = 0;
158 ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
159
160 if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) {
161 /* this can happen after resuming a swsusp snapshot */
162 if (ohci->rh_state != OHCI_RH_RUNNING) {
163 ohci_dbg (ohci, "BIOS/SMM active, control %03x\n",
164 ohci->hc_control);
165 status = -EBUSY;
166 /* this happens when pmcore resumes HC then root */
167 } else {
168 ohci_dbg (ohci, "duplicate resume\n");
169 status = 0;
170 }
171 } else switch (ohci->hc_control & OHCI_CTRL_HCFS) {
172 case OHCI_USB_SUSPEND:
173 ohci->hc_control &= ~(OHCI_CTRL_HCFS|OHCI_SCHED_ENABLES);
174 ohci->hc_control |= OHCI_USB_RESUME;
175 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
176 (void) ohci_readl (ohci, &ohci->regs->control);
177 ohci_dbg (ohci, "%s root hub\n",
178 autostopped ? "auto-start" : "resume");
179 break;
180 case OHCI_USB_RESUME:
181 /* HCFS changes sometime after INTR_RD */
182 ohci_dbg(ohci, "%swakeup root hub\n",
183 autostopped ? "auto-" : "");
184 break;
185 case OHCI_USB_OPER:
186 /* this can happen after resuming a swsusp snapshot */
187 ohci_dbg (ohci, "snapshot resume? reinit\n");
188 status = -EBUSY;
189 break;
190 default: /* RESET, we lost power */
191 ohci_dbg (ohci, "lost power\n");
192 status = -EBUSY;
193 }
194 if (status == -EBUSY) {
195 if (!autostopped) {
196 spin_unlock_irq (&ohci->lock);
197 status = ohci_restart (ohci);
198
199 usb_root_hub_lost_power(hcd->self.root_hub);
200
201 spin_lock_irq (&ohci->lock);
202 }
203 return status;
204 }
205 if (status != -EINPROGRESS)
206 return status;
207 if (autostopped)
208 goto skip_resume;
209 spin_unlock_irq (&ohci->lock);
210
211 /* Some controllers (lucent erratum) need extra-long delays */
212 msleep (20 /* usb 11.5.1.10 */ + 12 /* 32 msec counter */ + 1);
213
214 temp = ohci_readl (ohci, &ohci->regs->control);
215 temp &= OHCI_CTRL_HCFS;
216 if (temp != OHCI_USB_RESUME) {
217 ohci_err (ohci, "controller won't resume\n");
218 spin_lock_irq(&ohci->lock);
219 return -EBUSY;
220 }
221
222 /* disable old schedule state, reinit from scratch */
223 ohci_writel (ohci, 0, &ohci->regs->ed_controlhead);
224 ohci_writel (ohci, 0, &ohci->regs->ed_controlcurrent);
225 ohci_writel (ohci, 0, &ohci->regs->ed_bulkhead);
226 ohci_writel (ohci, 0, &ohci->regs->ed_bulkcurrent);
227 ohci_writel (ohci, 0, &ohci->regs->ed_periodcurrent);
228 ohci_writel (ohci, (u32) ohci->hcca_dma, &ohci->regs->hcca);
229
230 /* Sometimes PCI D3 suspend trashes frame timings ... */
231 periodic_reinit (ohci);
232
233 /*
234 * The following code is executed with ohci->lock held and
235 * irqs disabled if and only if autostopped is true. This
236 * will cause sparse to warn about a "context imbalance".
237 */
238skip_resume:
239 /* interrupts might have been disabled */
240 ohci_writel (ohci, OHCI_INTR_INIT, &ohci->regs->intrenable);
241 if (ohci->ed_rm_list)
242 ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrenable);
243
244 /* Then re-enable operations */
245 ohci_writel (ohci, OHCI_USB_OPER, &ohci->regs->control);
246 (void) ohci_readl (ohci, &ohci->regs->control);
247 if (!autostopped)
248 msleep (3);
249
250 temp = ohci->hc_control;
251 temp &= OHCI_CTRL_RWC;
252 temp |= OHCI_CONTROL_INIT | OHCI_USB_OPER;
253 ohci->hc_control = temp;
254 ohci_writel (ohci, temp, &ohci->regs->control);
255 (void) ohci_readl (ohci, &ohci->regs->control);
256
257 /* TRSMRCY */
258 if (!autostopped) {
259 msleep (10);
260 spin_lock_irq (&ohci->lock);
261 }
262 /* now ohci->lock is always held and irqs are always disabled */
263
264 /* keep it alive for more than ~5x suspend + resume costs */
265 ohci->next_statechange = jiffies + STATECHANGE_DELAY;
266
267 /* maybe turn schedules back on */
268 enables = 0;
269 temp = 0;
270 if (!ohci->ed_rm_list) {
271 if (ohci->ed_controltail) {
272 ohci_writel (ohci,
273 find_head (ohci->ed_controltail)->dma,
274 &ohci->regs->ed_controlhead);
275 enables |= OHCI_CTRL_CLE;
276 temp |= OHCI_CLF;
277 }
278 if (ohci->ed_bulktail) {
279 ohci_writel (ohci, find_head (ohci->ed_bulktail)->dma,
280 &ohci->regs->ed_bulkhead);
281 enables |= OHCI_CTRL_BLE;
282 temp |= OHCI_BLF;
283 }
284 }
285 if (hcd->self.bandwidth_isoc_reqs || hcd->self.bandwidth_int_reqs)
286 enables |= OHCI_CTRL_PLE|OHCI_CTRL_IE;
287 if (enables) {
288 ohci_dbg (ohci, "restarting schedules ... %08x\n", enables);
289 ohci->hc_control |= enables;
290 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
291 if (temp)
292 ohci_writel (ohci, temp, &ohci->regs->cmdstatus);
293 (void) ohci_readl (ohci, &ohci->regs->control);
294 }
295
296 ohci->rh_state = OHCI_RH_RUNNING;
297 return 0;
298}
299
300static int ohci_bus_suspend (struct usb_hcd *hcd)
301{
302 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
303 int rc;
304
305 spin_lock_irq (&ohci->lock);
306
307 if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
308 rc = -ESHUTDOWN;
309 else
310 rc = ohci_rh_suspend (ohci, 0);
311 spin_unlock_irq (&ohci->lock);
312 return rc;
313}
314
315static int ohci_bus_resume (struct usb_hcd *hcd)
316{
317 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
318 int rc;
319
320 if (time_before (jiffies, ohci->next_statechange))
321 msleep(5);
322
323 spin_lock_irq (&ohci->lock);
324
325 if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
326 rc = -ESHUTDOWN;
327 else
328 rc = ohci_rh_resume (ohci);
329 spin_unlock_irq (&ohci->lock);
330
331 /* poll until we know a device is connected or we autostop */
332 if (rc == 0)
333 usb_hcd_poll_rh_status(hcd);
334 return rc;
335}
336
337/* Carry out polling-, autostop-, and autoresume-related state changes */
338static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
339 int any_connected, int rhsc_status)
340{
341 int poll_rh = 1;
342 int rhsc_enable;
343
344 /* Some broken controllers never turn off RHSC in the interrupt
345 * status register. For their sake we won't re-enable RHSC
346 * interrupts if the interrupt bit is already active.
347 */
348 rhsc_enable = ohci_readl(ohci, &ohci->regs->intrenable) &
349 OHCI_INTR_RHSC;
350
351 switch (ohci->hc_control & OHCI_CTRL_HCFS) {
352 case OHCI_USB_OPER:
353 /* If no status changes are pending, enable RHSC interrupts. */
354 if (!rhsc_enable && !rhsc_status && !changed) {
355 rhsc_enable = OHCI_INTR_RHSC;
356 ohci_writel(ohci, rhsc_enable, &ohci->regs->intrenable);
357 }
358
359 /* Keep on polling until we know a device is connected
360 * and RHSC is enabled, or until we autostop.
361 */
362 if (!ohci->autostop) {
363 if (any_connected ||
364 !device_may_wakeup(&ohci_to_hcd(ohci)
365 ->self.root_hub->dev)) {
366 if (rhsc_enable)
367 poll_rh = 0;
368 } else {
369 ohci->autostop = 1;
370 ohci->next_statechange = jiffies + HZ;
371 }
372
373 /* if no devices have been attached for one second, autostop */
374 } else {
375 if (changed || any_connected) {
376 ohci->autostop = 0;
377 ohci->next_statechange = jiffies +
378 STATECHANGE_DELAY;
379 } else if (time_after_eq(jiffies,
380 ohci->next_statechange)
381 && !ohci->ed_rm_list
382 && !(ohci->hc_control &
383 OHCI_SCHED_ENABLES)) {
384 ohci_rh_suspend(ohci, 1);
385 if (rhsc_enable)
386 poll_rh = 0;
387 }
388 }
389 break;
390
391 case OHCI_USB_SUSPEND:
392 case OHCI_USB_RESUME:
393 /* if there is a port change, autostart or ask to be resumed */
394 if (changed) {
395 if (ohci->autostop)
396 ohci_rh_resume(ohci);
397 else
398 usb_hcd_resume_root_hub(ohci_to_hcd(ohci));
399
400 /* If remote wakeup is disabled, stop polling */
401 } else if (!ohci->autostop &&
402 !ohci_to_hcd(ohci)->self.root_hub->
403 do_remote_wakeup) {
404 poll_rh = 0;
405
406 } else {
407 /* If no status changes are pending,
408 * enable RHSC interrupts
409 */
410 if (!rhsc_enable && !rhsc_status) {
411 rhsc_enable = OHCI_INTR_RHSC;
412 ohci_writel(ohci, rhsc_enable,
413 &ohci->regs->intrenable);
414 }
415 /* Keep polling until RHSC is enabled */
416 if (rhsc_enable)
417 poll_rh = 0;
418 }
419 break;
420 }
421 return poll_rh;
422}
423
424#else /* CONFIG_PM */
425
426static inline int ohci_rh_resume(struct ohci_hcd *ohci)
427{
428 return 0;
429}
430
431/* Carry out polling-related state changes.
432 * autostop isn't used when CONFIG_PM is turned off.
433 */
434static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
435 int any_connected, int rhsc_status)
436{
437 /* If RHSC is enabled, don't poll */
438 if (ohci_readl(ohci, &ohci->regs->intrenable) & OHCI_INTR_RHSC)
439 return 0;
440
441 /* If status changes are pending, continue polling.
442 * Conversely, if no status changes are pending but the RHSC
443 * status bit was set, then RHSC may be broken so continue polling.
444 */
445 if (changed || rhsc_status)
446 return 1;
447
448 /* It's safe to re-enable RHSC interrupts */
449 ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrenable);
450 return 0;
451}
452
453#endif /* CONFIG_PM */
454
455/*-------------------------------------------------------------------------*/
456
457/* build "status change" packet (one or two bytes) from HC registers */
458
459static int
460ohci_hub_status_data (struct usb_hcd *hcd, char *buf)
461{
462 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
463 int i, changed = 0, length = 1;
464 int any_connected = 0;
465 int rhsc_status;
466 unsigned long flags;
467
468 spin_lock_irqsave (&ohci->lock, flags);
469 if (!HCD_HW_ACCESSIBLE(hcd))
470 goto done;
471
472 /* undocumented erratum seen on at least rev D */
473 if ((ohci->flags & OHCI_QUIRK_AMD756)
474 && (roothub_a (ohci) & RH_A_NDP) > MAX_ROOT_PORTS) {
475 ohci_warn (ohci, "bogus NDP, rereads as NDP=%d\n",
476 ohci_readl (ohci, &ohci->regs->roothub.a) & RH_A_NDP);
477 /* retry later; "should not happen" */
478 goto done;
479 }
480
481 /* init status */
482 if (roothub_status (ohci) & (RH_HS_LPSC | RH_HS_OCIC))
483 buf [0] = changed = 1;
484 else
485 buf [0] = 0;
486 if (ohci->num_ports > 7) {
487 buf [1] = 0;
488 length++;
489 }
490
491 /* Clear the RHSC status flag before reading the port statuses */
492 ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrstatus);
493 rhsc_status = ohci_readl(ohci, &ohci->regs->intrstatus) &
494 OHCI_INTR_RHSC;
495
496 /* look at each port */
497 for (i = 0; i < ohci->num_ports; i++) {
498 u32 status = roothub_portstatus (ohci, i);
499
500 /* can't autostop if ports are connected */
501 any_connected |= (status & RH_PS_CCS);
502
503 if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC
504 | RH_PS_OCIC | RH_PS_PRSC)) {
505 changed = 1;
506 if (i < 7)
507 buf [0] |= 1 << (i + 1);
508 else
509 buf [1] |= 1 << (i - 7);
510 }
511 }
512
513 if (ohci_root_hub_state_changes(ohci, changed,
514 any_connected, rhsc_status))
515 set_bit(HCD_FLAG_POLL_RH, &hcd->flags);
516 else
517 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
518
519
520done:
521 spin_unlock_irqrestore (&ohci->lock, flags);
522
523 return changed ? length : 0;
524}
525
526/*-------------------------------------------------------------------------*/
527
528static void
529ohci_hub_descriptor (
530 struct ohci_hcd *ohci,
531 struct usb_hub_descriptor *desc
532) {
533 u32 rh = roothub_a (ohci);
534 u16 temp;
535
536 desc->bDescriptorType = 0x29;
537 desc->bPwrOn2PwrGood = (rh & RH_A_POTPGT) >> 24;
538 desc->bHubContrCurrent = 0;
539
540 desc->bNbrPorts = ohci->num_ports;
541 temp = 1 + (ohci->num_ports / 8);
542 desc->bDescLength = 7 + 2 * temp;
543
544 temp = 0;
545 if (rh & RH_A_NPS) /* no power switching? */
546 temp |= 0x0002;
547 if (rh & RH_A_PSM) /* per-port power switching? */
548 temp |= 0x0001;
549 if (rh & RH_A_NOCP) /* no overcurrent reporting? */
550 temp |= 0x0010;
551 else if (rh & RH_A_OCPM) /* per-port overcurrent reporting? */
552 temp |= 0x0008;
553 desc->wHubCharacteristics = cpu_to_le16(temp);
554
555 /* ports removable, and usb 1.0 legacy PortPwrCtrlMask */
556 rh = roothub_b (ohci);
557 memset(desc->u.hs.DeviceRemovable, 0xff,
558 sizeof(desc->u.hs.DeviceRemovable));
559 desc->u.hs.DeviceRemovable[0] = rh & RH_B_DR;
560 if (ohci->num_ports > 7) {
561 desc->u.hs.DeviceRemovable[1] = (rh & RH_B_DR) >> 8;
562 desc->u.hs.DeviceRemovable[2] = 0xff;
563 } else
564 desc->u.hs.DeviceRemovable[1] = 0xff;
565}
566
567/*-------------------------------------------------------------------------*/
568
569#ifdef CONFIG_USB_OTG
570
571static int ohci_start_port_reset (struct usb_hcd *hcd, unsigned port)
572{
573 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
574 u32 status;
575
576 if (!port)
577 return -EINVAL;
578 port--;
579
580 /* start port reset before HNP protocol times out */
581 status = ohci_readl(ohci, &ohci->regs->roothub.portstatus [port]);
582 if (!(status & RH_PS_CCS))
583 return -ENODEV;
584
585 /* khubd will finish the reset later */
586 ohci_writel(ohci, RH_PS_PRS, &ohci->regs->roothub.portstatus [port]);
587 return 0;
588}
589
590#else
591
592#define ohci_start_port_reset NULL
593
594#endif
595
596/*-------------------------------------------------------------------------*/
597
598
599/* See usb 7.1.7.5: root hubs must issue at least 50 msec reset signaling,
600 * not necessarily continuous ... to guard against resume signaling.
601 */
602#define PORT_RESET_MSEC 50
603
604/* this timer value might be vendor-specific ... */
605#define PORT_RESET_HW_MSEC 10
606
607/* wrap-aware logic morphed from <linux/jiffies.h> */
608#define tick_before(t1,t2) ((s16)(((s16)(t1))-((s16)(t2))) < 0)
609
610/* called from some task, normally khubd */
611static inline int root_port_reset (struct ohci_hcd *ohci, unsigned port)
612{
613 __hc32 __iomem *portstat = &ohci->regs->roothub.portstatus [port];
614 u32 temp = 0;
615 u16 now = ohci_readl(ohci, &ohci->regs->fmnumber);
616 u16 reset_done = now + PORT_RESET_MSEC;
617 int limit_1 = DIV_ROUND_UP(PORT_RESET_MSEC, PORT_RESET_HW_MSEC);
618
619 /* build a "continuous enough" reset signal, with up to
620 * 3msec gap between pulses. scheduler HZ==100 must work;
621 * this might need to be deadline-scheduled.
622 */
623 do {
624 int limit_2;
625
626 /* spin until any current reset finishes */
627 limit_2 = PORT_RESET_HW_MSEC * 2;
628 while (--limit_2 >= 0) {
629 temp = ohci_readl (ohci, portstat);
630 /* handle e.g. CardBus eject */
631 if (temp == ~(u32)0)
632 return -ESHUTDOWN;
633 if (!(temp & RH_PS_PRS))
634 break;
635 udelay (500);
636 }
637
638 /* timeout (a hardware error) has been observed when
639 * EHCI sets CF while this driver is resetting a port;
640 * presumably other disconnect paths might do it too.
641 */
642 if (limit_2 < 0) {
643 ohci_dbg(ohci,
644 "port[%d] reset timeout, stat %08x\n",
645 port, temp);
646 break;
647 }
648
649 if (!(temp & RH_PS_CCS))
650 break;
651 if (temp & RH_PS_PRSC)
652 ohci_writel (ohci, RH_PS_PRSC, portstat);
653
654 /* start the next reset, sleep till it's probably done */
655 ohci_writel (ohci, RH_PS_PRS, portstat);
656 msleep(PORT_RESET_HW_MSEC);
657 now = ohci_readl(ohci, &ohci->regs->fmnumber);
658 } while (tick_before(now, reset_done) && --limit_1 >= 0);
659
660 /* caller synchronizes using PRSC ... and handles PRS
661 * still being set when this returns.
662 */
663
664 return 0;
665}
666
667static int ohci_hub_control (
668 struct usb_hcd *hcd,
669 u16 typeReq,
670 u16 wValue,
671 u16 wIndex,
672 char *buf,
673 u16 wLength
674) {
675 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
676 int ports = ohci->num_ports;
677 u32 temp;
678 int retval = 0;
679
680 if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
681 return -ESHUTDOWN;
682
683 switch (typeReq) {
684 case ClearHubFeature:
685 switch (wValue) {
686 case C_HUB_OVER_CURRENT:
687 ohci_writel (ohci, RH_HS_OCIC,
688 &ohci->regs->roothub.status);
689 case C_HUB_LOCAL_POWER:
690 break;
691 default:
692 goto error;
693 }
694 break;
695 case ClearPortFeature:
696 if (!wIndex || wIndex > ports)
697 goto error;
698 wIndex--;
699
700 switch (wValue) {
701 case USB_PORT_FEAT_ENABLE:
702 temp = RH_PS_CCS;
703 break;
704 case USB_PORT_FEAT_C_ENABLE:
705 temp = RH_PS_PESC;
706 break;
707 case USB_PORT_FEAT_SUSPEND:
708 temp = RH_PS_POCI;
709 break;
710 case USB_PORT_FEAT_C_SUSPEND:
711 temp = RH_PS_PSSC;
712 break;
713 case USB_PORT_FEAT_POWER:
714 temp = RH_PS_LSDA;
715 break;
716 case USB_PORT_FEAT_C_CONNECTION:
717 temp = RH_PS_CSC;
718 break;
719 case USB_PORT_FEAT_C_OVER_CURRENT:
720 temp = RH_PS_OCIC;
721 break;
722 case USB_PORT_FEAT_C_RESET:
723 temp = RH_PS_PRSC;
724 break;
725 default:
726 goto error;
727 }
728 ohci_writel (ohci, temp,
729 &ohci->regs->roothub.portstatus [wIndex]);
730 // ohci_readl (ohci, &ohci->regs->roothub.portstatus [wIndex]);
731 break;
732 case GetHubDescriptor:
733 ohci_hub_descriptor (ohci, (struct usb_hub_descriptor *) buf);
734 break;
735 case GetHubStatus:
736 temp = roothub_status (ohci) & ~(RH_HS_CRWE | RH_HS_DRWE);
737 put_unaligned_le32(temp, buf);
738 break;
739 case GetPortStatus:
740 if (!wIndex || wIndex > ports)
741 goto error;
742 wIndex--;
743 temp = roothub_portstatus (ohci, wIndex);
744 put_unaligned_le32(temp, buf);
745
746 if (*(u16*)(buf+2)) /* only if wPortChange is interesting */
747 dbg_port(ohci, "GetStatus", wIndex, temp);
748 break;
749 case SetHubFeature:
750 switch (wValue) {
751 case C_HUB_OVER_CURRENT:
752 // FIXME: this can be cleared, yes?
753 case C_HUB_LOCAL_POWER:
754 break;
755 default:
756 goto error;
757 }
758 break;
759 case SetPortFeature:
760 if (!wIndex || wIndex > ports)
761 goto error;
762 wIndex--;
763 switch (wValue) {
764 case USB_PORT_FEAT_SUSPEND:
765#ifdef CONFIG_USB_OTG
766 if (hcd->self.otg_port == (wIndex + 1)
767 && hcd->self.b_hnp_enable)
768 ohci->start_hnp(ohci);
769 else
770#endif
771 ohci_writel (ohci, RH_PS_PSS,
772 &ohci->regs->roothub.portstatus [wIndex]);
773 break;
774 case USB_PORT_FEAT_POWER:
775 ohci_writel (ohci, RH_PS_PPS,
776 &ohci->regs->roothub.portstatus [wIndex]);
777 break;
778 case USB_PORT_FEAT_RESET:
779 retval = root_port_reset (ohci, wIndex);
780 break;
781 default:
782 goto error;
783 }
784 break;
785
786 default:
787error:
788 /* "protocol stall" on error */
789 retval = -EPIPE;
790 }
791 return retval;
792}
793