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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 /* maybe resume can wake root hub */
94 if (ohci_to_hcd(ohci)->self.root_hub->do_remote_wakeup || autostop) {
95 ohci->hc_control |= OHCI_CTRL_RWE;
96 } else {
97 ohci_writel(ohci, OHCI_INTR_RHSC | OHCI_INTR_RD,
98 &ohci->regs->intrdisable);
99 ohci->hc_control &= ~OHCI_CTRL_RWE;
100 }
101
102 /* Suspend hub ... this is the "global (to this bus) suspend" mode,
103 * which doesn't imply ports will first be individually suspended.
104 */
105 ohci->hc_control &= ~OHCI_CTRL_HCFS;
106 ohci->hc_control |= OHCI_USB_SUSPEND;
107 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
108 (void) ohci_readl (ohci, &ohci->regs->control);
109
110 /* no resumes until devices finish suspending */
111 if (!autostop) {
112 ohci->next_statechange = jiffies + msecs_to_jiffies (5);
113 ohci->autostop = 0;
114 ohci->rh_state = OHCI_RH_SUSPENDED;
115 }
116
117done:
118 return status;
119}
120
121static inline struct ed *find_head (struct ed *ed)
122{
123 /* for bulk and control lists */
124 while (ed->ed_prev)
125 ed = ed->ed_prev;
126 return ed;
127}
128
129/* caller has locked the root hub */
130static int ohci_rh_resume (struct ohci_hcd *ohci)
131__releases(ohci->lock)
132__acquires(ohci->lock)
133{
134 struct usb_hcd *hcd = ohci_to_hcd (ohci);
135 u32 temp, enables;
136 int status = -EINPROGRESS;
137 int autostopped = ohci->autostop;
138
139 ohci->autostop = 0;
140 ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
141
142 if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) {
143 /* this can happen after resuming a swsusp snapshot */
144 if (ohci->rh_state != OHCI_RH_RUNNING) {
145 ohci_dbg (ohci, "BIOS/SMM active, control %03x\n",
146 ohci->hc_control);
147 status = -EBUSY;
148 /* this happens when pmcore resumes HC then root */
149 } else {
150 ohci_dbg (ohci, "duplicate resume\n");
151 status = 0;
152 }
153 } else switch (ohci->hc_control & OHCI_CTRL_HCFS) {
154 case OHCI_USB_SUSPEND:
155 ohci->hc_control &= ~(OHCI_CTRL_HCFS|OHCI_SCHED_ENABLES);
156 ohci->hc_control |= OHCI_USB_RESUME;
157 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
158 (void) ohci_readl (ohci, &ohci->regs->control);
159 ohci_dbg (ohci, "%s root hub\n",
160 autostopped ? "auto-start" : "resume");
161 break;
162 case OHCI_USB_RESUME:
163 /* HCFS changes sometime after INTR_RD */
164 ohci_dbg(ohci, "%swakeup root hub\n",
165 autostopped ? "auto-" : "");
166 break;
167 case OHCI_USB_OPER:
168 /* this can happen after resuming a swsusp snapshot */
169 ohci_dbg (ohci, "snapshot resume? reinit\n");
170 status = -EBUSY;
171 break;
172 default: /* RESET, we lost power */
173 ohci_dbg (ohci, "lost power\n");
174 status = -EBUSY;
175 }
176 if (status == -EBUSY) {
177 if (!autostopped) {
178 spin_unlock_irq (&ohci->lock);
179 (void) ohci_init (ohci);
180 status = ohci_restart (ohci);
181
182 usb_root_hub_lost_power(hcd->self.root_hub);
183
184 spin_lock_irq (&ohci->lock);
185 }
186 return status;
187 }
188 if (status != -EINPROGRESS)
189 return status;
190 if (autostopped)
191 goto skip_resume;
192 spin_unlock_irq (&ohci->lock);
193
194 /* Some controllers (lucent erratum) need extra-long delays */
195 msleep (20 /* usb 11.5.1.10 */ + 12 /* 32 msec counter */ + 1);
196
197 temp = ohci_readl (ohci, &ohci->regs->control);
198 temp &= OHCI_CTRL_HCFS;
199 if (temp != OHCI_USB_RESUME) {
200 ohci_err (ohci, "controller won't resume\n");
201 spin_lock_irq(&ohci->lock);
202 return -EBUSY;
203 }
204
205 /* disable old schedule state, reinit from scratch */
206 ohci_writel (ohci, 0, &ohci->regs->ed_controlhead);
207 ohci_writel (ohci, 0, &ohci->regs->ed_controlcurrent);
208 ohci_writel (ohci, 0, &ohci->regs->ed_bulkhead);
209 ohci_writel (ohci, 0, &ohci->regs->ed_bulkcurrent);
210 ohci_writel (ohci, 0, &ohci->regs->ed_periodcurrent);
211 ohci_writel (ohci, (u32) ohci->hcca_dma, &ohci->regs->hcca);
212
213 /* Sometimes PCI D3 suspend trashes frame timings ... */
214 periodic_reinit (ohci);
215
216 /* the following code is executed with ohci->lock held and
217 * irqs disabled if and only if autostopped is true
218 */
219
220skip_resume:
221 /* interrupts might have been disabled */
222 ohci_writel (ohci, OHCI_INTR_INIT, &ohci->regs->intrenable);
223 if (ohci->ed_rm_list)
224 ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrenable);
225
226 /* Then re-enable operations */
227 ohci_writel (ohci, OHCI_USB_OPER, &ohci->regs->control);
228 (void) ohci_readl (ohci, &ohci->regs->control);
229 if (!autostopped)
230 msleep (3);
231
232 temp = ohci->hc_control;
233 temp &= OHCI_CTRL_RWC;
234 temp |= OHCI_CONTROL_INIT | OHCI_USB_OPER;
235 ohci->hc_control = temp;
236 ohci_writel (ohci, temp, &ohci->regs->control);
237 (void) ohci_readl (ohci, &ohci->regs->control);
238
239 /* TRSMRCY */
240 if (!autostopped) {
241 msleep (10);
242 spin_lock_irq (&ohci->lock);
243 }
244 /* now ohci->lock is always held and irqs are always disabled */
245
246 /* keep it alive for more than ~5x suspend + resume costs */
247 ohci->next_statechange = jiffies + STATECHANGE_DELAY;
248
249 /* maybe turn schedules back on */
250 enables = 0;
251 temp = 0;
252 if (!ohci->ed_rm_list) {
253 if (ohci->ed_controltail) {
254 ohci_writel (ohci,
255 find_head (ohci->ed_controltail)->dma,
256 &ohci->regs->ed_controlhead);
257 enables |= OHCI_CTRL_CLE;
258 temp |= OHCI_CLF;
259 }
260 if (ohci->ed_bulktail) {
261 ohci_writel (ohci, find_head (ohci->ed_bulktail)->dma,
262 &ohci->regs->ed_bulkhead);
263 enables |= OHCI_CTRL_BLE;
264 temp |= OHCI_BLF;
265 }
266 }
267 if (hcd->self.bandwidth_isoc_reqs || hcd->self.bandwidth_int_reqs)
268 enables |= OHCI_CTRL_PLE|OHCI_CTRL_IE;
269 if (enables) {
270 ohci_dbg (ohci, "restarting schedules ... %08x\n", enables);
271 ohci->hc_control |= enables;
272 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
273 if (temp)
274 ohci_writel (ohci, temp, &ohci->regs->cmdstatus);
275 (void) ohci_readl (ohci, &ohci->regs->control);
276 }
277
278 ohci->rh_state = OHCI_RH_RUNNING;
279 return 0;
280}
281
282static int ohci_bus_suspend (struct usb_hcd *hcd)
283{
284 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
285 int rc;
286
287 spin_lock_irq (&ohci->lock);
288
289 if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
290 rc = -ESHUTDOWN;
291 else
292 rc = ohci_rh_suspend (ohci, 0);
293 spin_unlock_irq (&ohci->lock);
294 return rc;
295}
296
297static int ohci_bus_resume (struct usb_hcd *hcd)
298{
299 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
300 int rc;
301
302 if (time_before (jiffies, ohci->next_statechange))
303 msleep(5);
304
305 spin_lock_irq (&ohci->lock);
306
307 if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
308 rc = -ESHUTDOWN;
309 else
310 rc = ohci_rh_resume (ohci);
311 spin_unlock_irq (&ohci->lock);
312
313 /* poll until we know a device is connected or we autostop */
314 if (rc == 0)
315 usb_hcd_poll_rh_status(hcd);
316 return rc;
317}
318
319/* Carry out the final steps of resuming the controller device */
320static void __maybe_unused ohci_finish_controller_resume(struct usb_hcd *hcd)
321{
322 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
323 int port;
324 bool need_reinit = false;
325
326 /* See if the controller is already running or has been reset */
327 ohci->hc_control = ohci_readl(ohci, &ohci->regs->control);
328 if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) {
329 need_reinit = true;
330 } else {
331 switch (ohci->hc_control & OHCI_CTRL_HCFS) {
332 case OHCI_USB_OPER:
333 case OHCI_USB_RESET:
334 need_reinit = true;
335 }
336 }
337
338 /* If needed, reinitialize and suspend the root hub */
339 if (need_reinit) {
340 spin_lock_irq(&ohci->lock);
341 ohci_rh_resume(ohci);
342 ohci_rh_suspend(ohci, 0);
343 spin_unlock_irq(&ohci->lock);
344 }
345
346 /* Normally just turn on port power and enable interrupts */
347 else {
348 ohci_dbg(ohci, "powerup ports\n");
349 for (port = 0; port < ohci->num_ports; port++)
350 ohci_writel(ohci, RH_PS_PPS,
351 &ohci->regs->roothub.portstatus[port]);
352
353 ohci_writel(ohci, OHCI_INTR_MIE, &ohci->regs->intrenable);
354 ohci_readl(ohci, &ohci->regs->intrenable);
355 msleep(20);
356 }
357
358 usb_hcd_resume_root_hub(hcd);
359}
360
361/* Carry out polling-, autostop-, and autoresume-related state changes */
362static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
363 int any_connected, int rhsc_status)
364{
365 int poll_rh = 1;
366 int rhsc_enable;
367
368 /* Some broken controllers never turn off RHSC in the interrupt
369 * status register. For their sake we won't re-enable RHSC
370 * interrupts if the interrupt bit is already active.
371 */
372 rhsc_enable = ohci_readl(ohci, &ohci->regs->intrenable) &
373 OHCI_INTR_RHSC;
374
375 switch (ohci->hc_control & OHCI_CTRL_HCFS) {
376 case OHCI_USB_OPER:
377 /* If no status changes are pending, enable RHSC interrupts. */
378 if (!rhsc_enable && !rhsc_status && !changed) {
379 rhsc_enable = OHCI_INTR_RHSC;
380 ohci_writel(ohci, rhsc_enable, &ohci->regs->intrenable);
381 }
382
383 /* Keep on polling until we know a device is connected
384 * and RHSC is enabled, or until we autostop.
385 */
386 if (!ohci->autostop) {
387 if (any_connected ||
388 !device_may_wakeup(&ohci_to_hcd(ohci)
389 ->self.root_hub->dev)) {
390 if (rhsc_enable)
391 poll_rh = 0;
392 } else {
393 ohci->autostop = 1;
394 ohci->next_statechange = jiffies + HZ;
395 }
396
397 /* if no devices have been attached for one second, autostop */
398 } else {
399 if (changed || any_connected) {
400 ohci->autostop = 0;
401 ohci->next_statechange = jiffies +
402 STATECHANGE_DELAY;
403 } else if (time_after_eq(jiffies,
404 ohci->next_statechange)
405 && !ohci->ed_rm_list
406 && !(ohci->hc_control &
407 OHCI_SCHED_ENABLES)) {
408 ohci_rh_suspend(ohci, 1);
409 if (rhsc_enable)
410 poll_rh = 0;
411 }
412 }
413 break;
414
415 case OHCI_USB_SUSPEND:
416 case OHCI_USB_RESUME:
417 /* if there is a port change, autostart or ask to be resumed */
418 if (changed) {
419 if (ohci->autostop)
420 ohci_rh_resume(ohci);
421 else
422 usb_hcd_resume_root_hub(ohci_to_hcd(ohci));
423
424 /* If remote wakeup is disabled, stop polling */
425 } else if (!ohci->autostop &&
426 !ohci_to_hcd(ohci)->self.root_hub->
427 do_remote_wakeup) {
428 poll_rh = 0;
429
430 } else {
431 /* If no status changes are pending,
432 * enable RHSC interrupts
433 */
434 if (!rhsc_enable && !rhsc_status) {
435 rhsc_enable = OHCI_INTR_RHSC;
436 ohci_writel(ohci, rhsc_enable,
437 &ohci->regs->intrenable);
438 }
439 /* Keep polling until RHSC is enabled */
440 if (rhsc_enable)
441 poll_rh = 0;
442 }
443 break;
444 }
445 return poll_rh;
446}
447
448#else /* CONFIG_PM */
449
450static inline int ohci_rh_resume(struct ohci_hcd *ohci)
451{
452 return 0;
453}
454
455/* Carry out polling-related state changes.
456 * autostop isn't used when CONFIG_PM is turned off.
457 */
458static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
459 int any_connected, int rhsc_status)
460{
461 /* If RHSC is enabled, don't poll */
462 if (ohci_readl(ohci, &ohci->regs->intrenable) & OHCI_INTR_RHSC)
463 return 0;
464
465 /* If status changes are pending, continue polling.
466 * Conversely, if no status changes are pending but the RHSC
467 * status bit was set, then RHSC may be broken so continue polling.
468 */
469 if (changed || rhsc_status)
470 return 1;
471
472 /* It's safe to re-enable RHSC interrupts */
473 ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrenable);
474 return 0;
475}
476
477#endif /* CONFIG_PM */
478
479/*-------------------------------------------------------------------------*/
480
481/* build "status change" packet (one or two bytes) from HC registers */
482
483static int
484ohci_hub_status_data (struct usb_hcd *hcd, char *buf)
485{
486 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
487 int i, changed = 0, length = 1;
488 int any_connected = 0;
489 int rhsc_status;
490 unsigned long flags;
491
492 spin_lock_irqsave (&ohci->lock, flags);
493 if (!HCD_HW_ACCESSIBLE(hcd))
494 goto done;
495
496 /* undocumented erratum seen on at least rev D */
497 if ((ohci->flags & OHCI_QUIRK_AMD756)
498 && (roothub_a (ohci) & RH_A_NDP) > MAX_ROOT_PORTS) {
499 ohci_warn (ohci, "bogus NDP, rereads as NDP=%d\n",
500 ohci_readl (ohci, &ohci->regs->roothub.a) & RH_A_NDP);
501 /* retry later; "should not happen" */
502 goto done;
503 }
504
505 /* init status */
506 if (roothub_status (ohci) & (RH_HS_LPSC | RH_HS_OCIC))
507 buf [0] = changed = 1;
508 else
509 buf [0] = 0;
510 if (ohci->num_ports > 7) {
511 buf [1] = 0;
512 length++;
513 }
514
515 /* Clear the RHSC status flag before reading the port statuses */
516 ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrstatus);
517 rhsc_status = ohci_readl(ohci, &ohci->regs->intrstatus) &
518 OHCI_INTR_RHSC;
519
520 /* look at each port */
521 for (i = 0; i < ohci->num_ports; i++) {
522 u32 status = roothub_portstatus (ohci, i);
523
524 /* can't autostop if ports are connected */
525 any_connected |= (status & RH_PS_CCS);
526
527 if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC
528 | RH_PS_OCIC | RH_PS_PRSC)) {
529 changed = 1;
530 if (i < 7)
531 buf [0] |= 1 << (i + 1);
532 else
533 buf [1] |= 1 << (i - 7);
534 }
535 }
536
537 if (ohci_root_hub_state_changes(ohci, changed,
538 any_connected, rhsc_status))
539 set_bit(HCD_FLAG_POLL_RH, &hcd->flags);
540 else
541 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
542
543
544done:
545 spin_unlock_irqrestore (&ohci->lock, flags);
546
547 return changed ? length : 0;
548}
549
550/*-------------------------------------------------------------------------*/
551
552static void
553ohci_hub_descriptor (
554 struct ohci_hcd *ohci,
555 struct usb_hub_descriptor *desc
556) {
557 u32 rh = roothub_a (ohci);
558 u16 temp;
559
560 desc->bDescriptorType = 0x29;
561 desc->bPwrOn2PwrGood = (rh & RH_A_POTPGT) >> 24;
562 desc->bHubContrCurrent = 0;
563
564 desc->bNbrPorts = ohci->num_ports;
565 temp = 1 + (ohci->num_ports / 8);
566 desc->bDescLength = 7 + 2 * temp;
567
568 temp = 0;
569 if (rh & RH_A_NPS) /* no power switching? */
570 temp |= 0x0002;
571 if (rh & RH_A_PSM) /* per-port power switching? */
572 temp |= 0x0001;
573 if (rh & RH_A_NOCP) /* no overcurrent reporting? */
574 temp |= 0x0010;
575 else if (rh & RH_A_OCPM) /* per-port overcurrent reporting? */
576 temp |= 0x0008;
577 desc->wHubCharacteristics = (__force __u16)cpu_to_hc16(ohci, temp);
578
579 /* ports removable, and usb 1.0 legacy PortPwrCtrlMask */
580 rh = roothub_b (ohci);
581 memset(desc->u.hs.DeviceRemovable, 0xff,
582 sizeof(desc->u.hs.DeviceRemovable));
583 desc->u.hs.DeviceRemovable[0] = rh & RH_B_DR;
584 if (ohci->num_ports > 7) {
585 desc->u.hs.DeviceRemovable[1] = (rh & RH_B_DR) >> 8;
586 desc->u.hs.DeviceRemovable[2] = 0xff;
587 } else
588 desc->u.hs.DeviceRemovable[1] = 0xff;
589}
590
591/*-------------------------------------------------------------------------*/
592
593#ifdef CONFIG_USB_OTG
594
595static int ohci_start_port_reset (struct usb_hcd *hcd, unsigned port)
596{
597 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
598 u32 status;
599
600 if (!port)
601 return -EINVAL;
602 port--;
603
604 /* start port reset before HNP protocol times out */
605 status = ohci_readl(ohci, &ohci->regs->roothub.portstatus [port]);
606 if (!(status & RH_PS_CCS))
607 return -ENODEV;
608
609 /* khubd will finish the reset later */
610 ohci_writel(ohci, RH_PS_PRS, &ohci->regs->roothub.portstatus [port]);
611 return 0;
612}
613
614#else
615
616#define ohci_start_port_reset NULL
617
618#endif
619
620/*-------------------------------------------------------------------------*/
621
622
623/* See usb 7.1.7.5: root hubs must issue at least 50 msec reset signaling,
624 * not necessarily continuous ... to guard against resume signaling.
625 * The short timeout is safe for non-root hubs, and is backward-compatible
626 * with earlier Linux hosts.
627 */
628#ifdef CONFIG_USB_SUSPEND
629#define PORT_RESET_MSEC 50
630#else
631#define PORT_RESET_MSEC 10
632#endif
633
634/* this timer value might be vendor-specific ... */
635#define PORT_RESET_HW_MSEC 10
636
637/* wrap-aware logic morphed from <linux/jiffies.h> */
638#define tick_before(t1,t2) ((s16)(((s16)(t1))-((s16)(t2))) < 0)
639
640/* called from some task, normally khubd */
641static inline int root_port_reset (struct ohci_hcd *ohci, unsigned port)
642{
643 __hc32 __iomem *portstat = &ohci->regs->roothub.portstatus [port];
644 u32 temp = 0;
645 u16 now = ohci_readl(ohci, &ohci->regs->fmnumber);
646 u16 reset_done = now + PORT_RESET_MSEC;
647 int limit_1 = DIV_ROUND_UP(PORT_RESET_MSEC, PORT_RESET_HW_MSEC);
648
649 /* build a "continuous enough" reset signal, with up to
650 * 3msec gap between pulses. scheduler HZ==100 must work;
651 * this might need to be deadline-scheduled.
652 */
653 do {
654 int limit_2;
655
656 /* spin until any current reset finishes */
657 limit_2 = PORT_RESET_HW_MSEC * 2;
658 while (--limit_2 >= 0) {
659 temp = ohci_readl (ohci, portstat);
660 /* handle e.g. CardBus eject */
661 if (temp == ~(u32)0)
662 return -ESHUTDOWN;
663 if (!(temp & RH_PS_PRS))
664 break;
665 udelay (500);
666 }
667
668 /* timeout (a hardware error) has been observed when
669 * EHCI sets CF while this driver is resetting a port;
670 * presumably other disconnect paths might do it too.
671 */
672 if (limit_2 < 0) {
673 ohci_dbg(ohci,
674 "port[%d] reset timeout, stat %08x\n",
675 port, temp);
676 break;
677 }
678
679 if (!(temp & RH_PS_CCS))
680 break;
681 if (temp & RH_PS_PRSC)
682 ohci_writel (ohci, RH_PS_PRSC, portstat);
683
684 /* start the next reset, sleep till it's probably done */
685 ohci_writel (ohci, RH_PS_PRS, portstat);
686 msleep(PORT_RESET_HW_MSEC);
687 now = ohci_readl(ohci, &ohci->regs->fmnumber);
688 } while (tick_before(now, reset_done) && --limit_1 >= 0);
689
690 /* caller synchronizes using PRSC ... and handles PRS
691 * still being set when this returns.
692 */
693
694 return 0;
695}
696
697static int ohci_hub_control (
698 struct usb_hcd *hcd,
699 u16 typeReq,
700 u16 wValue,
701 u16 wIndex,
702 char *buf,
703 u16 wLength
704) {
705 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
706 int ports = ohci->num_ports;
707 u32 temp;
708 int retval = 0;
709
710 if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
711 return -ESHUTDOWN;
712
713 switch (typeReq) {
714 case ClearHubFeature:
715 switch (wValue) {
716 case C_HUB_OVER_CURRENT:
717 ohci_writel (ohci, RH_HS_OCIC,
718 &ohci->regs->roothub.status);
719 case C_HUB_LOCAL_POWER:
720 break;
721 default:
722 goto error;
723 }
724 break;
725 case ClearPortFeature:
726 if (!wIndex || wIndex > ports)
727 goto error;
728 wIndex--;
729
730 switch (wValue) {
731 case USB_PORT_FEAT_ENABLE:
732 temp = RH_PS_CCS;
733 break;
734 case USB_PORT_FEAT_C_ENABLE:
735 temp = RH_PS_PESC;
736 break;
737 case USB_PORT_FEAT_SUSPEND:
738 temp = RH_PS_POCI;
739 break;
740 case USB_PORT_FEAT_C_SUSPEND:
741 temp = RH_PS_PSSC;
742 break;
743 case USB_PORT_FEAT_POWER:
744 temp = RH_PS_LSDA;
745 break;
746 case USB_PORT_FEAT_C_CONNECTION:
747 temp = RH_PS_CSC;
748 break;
749 case USB_PORT_FEAT_C_OVER_CURRENT:
750 temp = RH_PS_OCIC;
751 break;
752 case USB_PORT_FEAT_C_RESET:
753 temp = RH_PS_PRSC;
754 break;
755 default:
756 goto error;
757 }
758 ohci_writel (ohci, temp,
759 &ohci->regs->roothub.portstatus [wIndex]);
760 // ohci_readl (ohci, &ohci->regs->roothub.portstatus [wIndex]);
761 break;
762 case GetHubDescriptor:
763 ohci_hub_descriptor (ohci, (struct usb_hub_descriptor *) buf);
764 break;
765 case GetHubStatus:
766 temp = roothub_status (ohci) & ~(RH_HS_CRWE | RH_HS_DRWE);
767 put_unaligned_le32(temp, buf);
768 break;
769 case GetPortStatus:
770 if (!wIndex || wIndex > ports)
771 goto error;
772 wIndex--;
773 temp = roothub_portstatus (ohci, wIndex);
774 put_unaligned_le32(temp, buf);
775
776#ifndef OHCI_VERBOSE_DEBUG
777 if (*(u16*)(buf+2)) /* only if wPortChange is interesting */
778#endif
779 dbg_port (ohci, "GetStatus", wIndex, temp);
780 break;
781 case SetHubFeature:
782 switch (wValue) {
783 case C_HUB_OVER_CURRENT:
784 // FIXME: this can be cleared, yes?
785 case C_HUB_LOCAL_POWER:
786 break;
787 default:
788 goto error;
789 }
790 break;
791 case SetPortFeature:
792 if (!wIndex || wIndex > ports)
793 goto error;
794 wIndex--;
795 switch (wValue) {
796 case USB_PORT_FEAT_SUSPEND:
797#ifdef CONFIG_USB_OTG
798 if (hcd->self.otg_port == (wIndex + 1)
799 && hcd->self.b_hnp_enable)
800 ohci->start_hnp(ohci);
801 else
802#endif
803 ohci_writel (ohci, RH_PS_PSS,
804 &ohci->regs->roothub.portstatus [wIndex]);
805 break;
806 case USB_PORT_FEAT_POWER:
807 ohci_writel (ohci, RH_PS_PPS,
808 &ohci->regs->roothub.portstatus [wIndex]);
809 break;
810 case USB_PORT_FEAT_RESET:
811 retval = root_port_reset (ohci, wIndex);
812 break;
813 default:
814 goto error;
815 }
816 break;
817
818 default:
819error:
820 /* "protocol stall" on error */
821 retval = -EPIPE;
822 }
823 return retval;
824}
825