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PM / clk: Add support for adding a specific clock from device-tree
[deliverable/linux.git] / drivers / usb / host / ehci-hub.c
1 /*
2 * Copyright (C) 2001-2004 by David Brownell
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the
6 * Free Software Foundation; either version 2 of the License, or (at your
7 * option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
11 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software Foundation,
16 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17 */
18
19 /* this file is part of ehci-hcd.c */
20
21 /*-------------------------------------------------------------------------*/
22
23 /*
24 * EHCI Root Hub ... the nonsharable stuff
25 *
26 * Registers don't need cpu_to_le32, that happens transparently
27 */
28
29 /*-------------------------------------------------------------------------*/
30 #include <linux/usb/otg.h>
31
32 #define PORT_WAKE_BITS (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
33
34 #ifdef CONFIG_PM
35
36 static void unlink_empty_async_suspended(struct ehci_hcd *ehci);
37
38 static int persist_enabled_on_companion(struct usb_device *udev, void *unused)
39 {
40 return !udev->maxchild && udev->persist_enabled &&
41 udev->bus->root_hub->speed < USB_SPEED_HIGH;
42 }
43
44 /* After a power loss, ports that were owned by the companion must be
45 * reset so that the companion can still own them.
46 */
47 static void ehci_handover_companion_ports(struct ehci_hcd *ehci)
48 {
49 u32 __iomem *reg;
50 u32 status;
51 int port;
52 __le32 buf;
53 struct usb_hcd *hcd = ehci_to_hcd(ehci);
54
55 if (!ehci->owned_ports)
56 return;
57
58 /*
59 * USB 1.1 devices are mostly HIDs, which don't need to persist across
60 * suspends. If we ensure that none of our companion's devices have
61 * persist_enabled (by looking through all USB 1.1 buses in the system),
62 * we can skip this and avoid slowing resume down. Devices without
63 * persist will just get reenumerated shortly after resume anyway.
64 */
65 if (!usb_for_each_dev(NULL, persist_enabled_on_companion))
66 return;
67
68 /* Make sure the ports are powered */
69 port = HCS_N_PORTS(ehci->hcs_params);
70 while (port--) {
71 if (test_bit(port, &ehci->owned_ports)) {
72 reg = &ehci->regs->port_status[port];
73 status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
74 if (!(status & PORT_POWER))
75 ehci_port_power(ehci, port, true);
76 }
77 }
78
79 /* Give the connections some time to appear */
80 msleep(20);
81
82 spin_lock_irq(&ehci->lock);
83 port = HCS_N_PORTS(ehci->hcs_params);
84 while (port--) {
85 if (test_bit(port, &ehci->owned_ports)) {
86 reg = &ehci->regs->port_status[port];
87 status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
88
89 /* Port already owned by companion? */
90 if (status & PORT_OWNER)
91 clear_bit(port, &ehci->owned_ports);
92 else if (test_bit(port, &ehci->companion_ports))
93 ehci_writel(ehci, status & ~PORT_PE, reg);
94 else {
95 spin_unlock_irq(&ehci->lock);
96 ehci_hub_control(hcd, SetPortFeature,
97 USB_PORT_FEAT_RESET, port + 1,
98 NULL, 0);
99 spin_lock_irq(&ehci->lock);
100 }
101 }
102 }
103 spin_unlock_irq(&ehci->lock);
104
105 if (!ehci->owned_ports)
106 return;
107 msleep(90); /* Wait for resets to complete */
108
109 spin_lock_irq(&ehci->lock);
110 port = HCS_N_PORTS(ehci->hcs_params);
111 while (port--) {
112 if (test_bit(port, &ehci->owned_ports)) {
113 spin_unlock_irq(&ehci->lock);
114 ehci_hub_control(hcd, GetPortStatus,
115 0, port + 1,
116 (char *) &buf, sizeof(buf));
117 spin_lock_irq(&ehci->lock);
118
119 /* The companion should now own the port,
120 * but if something went wrong the port must not
121 * remain enabled.
122 */
123 reg = &ehci->regs->port_status[port];
124 status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
125 if (status & PORT_OWNER)
126 ehci_writel(ehci, status | PORT_CSC, reg);
127 else {
128 ehci_dbg(ehci, "failed handover port %d: %x\n",
129 port + 1, status);
130 ehci_writel(ehci, status & ~PORT_PE, reg);
131 }
132 }
133 }
134
135 ehci->owned_ports = 0;
136 spin_unlock_irq(&ehci->lock);
137 }
138
139 static int ehci_port_change(struct ehci_hcd *ehci)
140 {
141 int i = HCS_N_PORTS(ehci->hcs_params);
142
143 /* First check if the controller indicates a change event */
144
145 if (ehci_readl(ehci, &ehci->regs->status) & STS_PCD)
146 return 1;
147
148 /*
149 * Not all controllers appear to update this while going from D3 to D0,
150 * so check the individual port status registers as well
151 */
152
153 while (i--)
154 if (ehci_readl(ehci, &ehci->regs->port_status[i]) & PORT_CSC)
155 return 1;
156
157 return 0;
158 }
159
160 void ehci_adjust_port_wakeup_flags(struct ehci_hcd *ehci,
161 bool suspending, bool do_wakeup)
162 {
163 int port;
164 u32 temp;
165
166 /* If remote wakeup is enabled for the root hub but disabled
167 * for the controller, we must adjust all the port wakeup flags
168 * when the controller is suspended or resumed. In all other
169 * cases they don't need to be changed.
170 */
171 if (!ehci_to_hcd(ehci)->self.root_hub->do_remote_wakeup || do_wakeup)
172 return;
173
174 spin_lock_irq(&ehci->lock);
175
176 /* clear phy low-power mode before changing wakeup flags */
177 if (ehci->has_tdi_phy_lpm) {
178 port = HCS_N_PORTS(ehci->hcs_params);
179 while (port--) {
180 u32 __iomem *hostpc_reg = &ehci->regs->hostpc[port];
181
182 temp = ehci_readl(ehci, hostpc_reg);
183 ehci_writel(ehci, temp & ~HOSTPC_PHCD, hostpc_reg);
184 }
185 spin_unlock_irq(&ehci->lock);
186 msleep(5);
187 spin_lock_irq(&ehci->lock);
188 }
189
190 port = HCS_N_PORTS(ehci->hcs_params);
191 while (port--) {
192 u32 __iomem *reg = &ehci->regs->port_status[port];
193 u32 t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
194 u32 t2 = t1 & ~PORT_WAKE_BITS;
195
196 /* If we are suspending the controller, clear the flags.
197 * If we are resuming the controller, set the wakeup flags.
198 */
199 if (!suspending) {
200 if (t1 & PORT_CONNECT)
201 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
202 else
203 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
204 }
205 ehci_writel(ehci, t2, reg);
206 }
207
208 /* enter phy low-power mode again */
209 if (ehci->has_tdi_phy_lpm) {
210 port = HCS_N_PORTS(ehci->hcs_params);
211 while (port--) {
212 u32 __iomem *hostpc_reg = &ehci->regs->hostpc[port];
213
214 temp = ehci_readl(ehci, hostpc_reg);
215 ehci_writel(ehci, temp | HOSTPC_PHCD, hostpc_reg);
216 }
217 }
218
219 /* Does the root hub have a port wakeup pending? */
220 if (!suspending && ehci_port_change(ehci))
221 usb_hcd_resume_root_hub(ehci_to_hcd(ehci));
222
223 spin_unlock_irq(&ehci->lock);
224 }
225 EXPORT_SYMBOL_GPL(ehci_adjust_port_wakeup_flags);
226
227 static int ehci_bus_suspend (struct usb_hcd *hcd)
228 {
229 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
230 int port;
231 int mask;
232 int changed;
233 bool fs_idle_delay;
234
235 ehci_dbg(ehci, "suspend root hub\n");
236
237 if (time_before (jiffies, ehci->next_statechange))
238 msleep(5);
239
240 /* stop the schedules */
241 ehci_quiesce(ehci);
242
243 spin_lock_irq (&ehci->lock);
244 if (ehci->rh_state < EHCI_RH_RUNNING)
245 goto done;
246
247 /* Once the controller is stopped, port resumes that are already
248 * in progress won't complete. Hence if remote wakeup is enabled
249 * for the root hub and any ports are in the middle of a resume or
250 * remote wakeup, we must fail the suspend.
251 */
252 if (hcd->self.root_hub->do_remote_wakeup) {
253 if (ehci->resuming_ports) {
254 spin_unlock_irq(&ehci->lock);
255 ehci_dbg(ehci, "suspend failed because a port is resuming\n");
256 return -EBUSY;
257 }
258 }
259
260 /* Unlike other USB host controller types, EHCI doesn't have
261 * any notion of "global" or bus-wide suspend. The driver has
262 * to manually suspend all the active unsuspended ports, and
263 * then manually resume them in the bus_resume() routine.
264 */
265 ehci->bus_suspended = 0;
266 ehci->owned_ports = 0;
267 changed = 0;
268 fs_idle_delay = false;
269 port = HCS_N_PORTS(ehci->hcs_params);
270 while (port--) {
271 u32 __iomem *reg = &ehci->regs->port_status [port];
272 u32 t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
273 u32 t2 = t1 & ~PORT_WAKE_BITS;
274
275 /* keep track of which ports we suspend */
276 if (t1 & PORT_OWNER)
277 set_bit(port, &ehci->owned_ports);
278 else if ((t1 & PORT_PE) && !(t1 & PORT_SUSPEND)) {
279 t2 |= PORT_SUSPEND;
280 set_bit(port, &ehci->bus_suspended);
281 }
282
283 /* enable remote wakeup on all ports, if told to do so */
284 if (hcd->self.root_hub->do_remote_wakeup) {
285 /* only enable appropriate wake bits, otherwise the
286 * hardware can not go phy low power mode. If a race
287 * condition happens here(connection change during bits
288 * set), the port change detection will finally fix it.
289 */
290 if (t1 & PORT_CONNECT)
291 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
292 else
293 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
294 }
295
296 if (t1 != t2) {
297 /*
298 * On some controllers, Wake-On-Disconnect will
299 * generate false wakeup signals until the bus
300 * switches over to full-speed idle. For their
301 * sake, add a delay if we need one.
302 */
303 if ((t2 & PORT_WKDISC_E) &&
304 ehci_port_speed(ehci, t2) ==
305 USB_PORT_STAT_HIGH_SPEED)
306 fs_idle_delay = true;
307 ehci_writel(ehci, t2, reg);
308 changed = 1;
309 }
310 }
311 spin_unlock_irq(&ehci->lock);
312
313 if ((changed && ehci->has_tdi_phy_lpm) || fs_idle_delay) {
314 /*
315 * Wait for HCD to enter low-power mode or for the bus
316 * to switch to full-speed idle.
317 */
318 usleep_range(5000, 5500);
319 }
320
321 if (changed && ehci->has_tdi_phy_lpm) {
322 spin_lock_irq(&ehci->lock);
323 port = HCS_N_PORTS(ehci->hcs_params);
324 while (port--) {
325 u32 __iomem *hostpc_reg = &ehci->regs->hostpc[port];
326 u32 t3;
327
328 t3 = ehci_readl(ehci, hostpc_reg);
329 ehci_writel(ehci, t3 | HOSTPC_PHCD, hostpc_reg);
330 t3 = ehci_readl(ehci, hostpc_reg);
331 ehci_dbg(ehci, "Port %d phy low-power mode %s\n",
332 port, (t3 & HOSTPC_PHCD) ?
333 "succeeded" : "failed");
334 }
335 spin_unlock_irq(&ehci->lock);
336 }
337
338 /* Apparently some devices need a >= 1-uframe delay here */
339 if (ehci->bus_suspended)
340 udelay(150);
341
342 /* turn off now-idle HC */
343 ehci_halt (ehci);
344
345 spin_lock_irq(&ehci->lock);
346 if (ehci->enabled_hrtimer_events & BIT(EHCI_HRTIMER_POLL_DEAD))
347 ehci_handle_controller_death(ehci);
348 if (ehci->rh_state != EHCI_RH_RUNNING)
349 goto done;
350 ehci->rh_state = EHCI_RH_SUSPENDED;
351
352 unlink_empty_async_suspended(ehci);
353
354 /* Any IAA cycle that started before the suspend is now invalid */
355 end_iaa_cycle(ehci);
356 ehci_handle_start_intr_unlinks(ehci);
357 ehci_handle_intr_unlinks(ehci);
358 end_free_itds(ehci);
359
360 /* allow remote wakeup */
361 mask = INTR_MASK;
362 if (!hcd->self.root_hub->do_remote_wakeup)
363 mask &= ~STS_PCD;
364 ehci_writel(ehci, mask, &ehci->regs->intr_enable);
365 ehci_readl(ehci, &ehci->regs->intr_enable);
366
367 done:
368 ehci->next_statechange = jiffies + msecs_to_jiffies(10);
369 ehci->enabled_hrtimer_events = 0;
370 ehci->next_hrtimer_event = EHCI_HRTIMER_NO_EVENT;
371 spin_unlock_irq (&ehci->lock);
372
373 hrtimer_cancel(&ehci->hrtimer);
374 return 0;
375 }
376
377
378 /* caller has locked the root hub, and should reset/reinit on error */
379 static int ehci_bus_resume (struct usb_hcd *hcd)
380 {
381 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
382 u32 temp;
383 u32 power_okay;
384 int i;
385 unsigned long resume_needed = 0;
386
387 if (time_before (jiffies, ehci->next_statechange))
388 msleep(5);
389 spin_lock_irq (&ehci->lock);
390 if (!HCD_HW_ACCESSIBLE(hcd) || ehci->shutdown)
391 goto shutdown;
392
393 if (unlikely(ehci->debug)) {
394 if (!dbgp_reset_prep(hcd))
395 ehci->debug = NULL;
396 else
397 dbgp_external_startup(hcd);
398 }
399
400 /* Ideally and we've got a real resume here, and no port's power
401 * was lost. (For PCI, that means Vaux was maintained.) But we
402 * could instead be restoring a swsusp snapshot -- so that BIOS was
403 * the last user of the controller, not reset/pm hardware keeping
404 * state we gave to it.
405 */
406 power_okay = ehci_readl(ehci, &ehci->regs->intr_enable);
407 ehci_dbg(ehci, "resume root hub%s\n",
408 power_okay ? "" : " after power loss");
409
410 /* at least some APM implementations will try to deliver
411 * IRQs right away, so delay them until we're ready.
412 */
413 ehci_writel(ehci, 0, &ehci->regs->intr_enable);
414
415 /* re-init operational registers */
416 ehci_writel(ehci, 0, &ehci->regs->segment);
417 ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
418 ehci_writel(ehci, (u32) ehci->async->qh_dma, &ehci->regs->async_next);
419
420 /* restore CMD_RUN, framelist size, and irq threshold */
421 ehci->command |= CMD_RUN;
422 ehci_writel(ehci, ehci->command, &ehci->regs->command);
423 ehci->rh_state = EHCI_RH_RUNNING;
424
425 /*
426 * According to Bugzilla #8190, the port status for some controllers
427 * will be wrong without a delay. At their wrong status, the port
428 * is enabled, but not suspended neither resumed.
429 */
430 i = HCS_N_PORTS(ehci->hcs_params);
431 while (i--) {
432 temp = ehci_readl(ehci, &ehci->regs->port_status[i]);
433 if ((temp & PORT_PE) &&
434 !(temp & (PORT_SUSPEND | PORT_RESUME))) {
435 ehci_dbg(ehci, "Port status(0x%x) is wrong\n", temp);
436 spin_unlock_irq(&ehci->lock);
437 msleep(8);
438 spin_lock_irq(&ehci->lock);
439 break;
440 }
441 }
442
443 if (ehci->shutdown)
444 goto shutdown;
445
446 /* clear phy low-power mode before resume */
447 if (ehci->bus_suspended && ehci->has_tdi_phy_lpm) {
448 i = HCS_N_PORTS(ehci->hcs_params);
449 while (i--) {
450 if (test_bit(i, &ehci->bus_suspended)) {
451 u32 __iomem *hostpc_reg =
452 &ehci->regs->hostpc[i];
453
454 temp = ehci_readl(ehci, hostpc_reg);
455 ehci_writel(ehci, temp & ~HOSTPC_PHCD,
456 hostpc_reg);
457 }
458 }
459 spin_unlock_irq(&ehci->lock);
460 msleep(5);
461 spin_lock_irq(&ehci->lock);
462 if (ehci->shutdown)
463 goto shutdown;
464 }
465
466 /* manually resume the ports we suspended during bus_suspend() */
467 i = HCS_N_PORTS (ehci->hcs_params);
468 while (i--) {
469 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
470 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
471 if (test_bit(i, &ehci->bus_suspended) &&
472 (temp & PORT_SUSPEND)) {
473 temp |= PORT_RESUME;
474 set_bit(i, &resume_needed);
475 }
476 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
477 }
478
479 /*
480 * msleep for USB_RESUME_TIMEOUT ms only if code is trying to resume
481 * port
482 */
483 if (resume_needed) {
484 spin_unlock_irq(&ehci->lock);
485 msleep(USB_RESUME_TIMEOUT);
486 spin_lock_irq(&ehci->lock);
487 if (ehci->shutdown)
488 goto shutdown;
489 }
490
491 i = HCS_N_PORTS (ehci->hcs_params);
492 while (i--) {
493 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
494 if (test_bit(i, &resume_needed)) {
495 temp &= ~(PORT_RWC_BITS | PORT_SUSPEND | PORT_RESUME);
496 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
497 }
498 }
499
500 ehci->next_statechange = jiffies + msecs_to_jiffies(5);
501 spin_unlock_irq(&ehci->lock);
502
503 ehci_handover_companion_ports(ehci);
504
505 /* Now we can safely re-enable irqs */
506 spin_lock_irq(&ehci->lock);
507 if (ehci->shutdown)
508 goto shutdown;
509 ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
510 (void) ehci_readl(ehci, &ehci->regs->intr_enable);
511 spin_unlock_irq(&ehci->lock);
512
513 return 0;
514
515 shutdown:
516 spin_unlock_irq(&ehci->lock);
517 return -ESHUTDOWN;
518 }
519
520 #else
521
522 #define ehci_bus_suspend NULL
523 #define ehci_bus_resume NULL
524
525 #endif /* CONFIG_PM */
526
527 /*-------------------------------------------------------------------------*/
528
529 /*
530 * Sets the owner of a port
531 */
532 static void set_owner(struct ehci_hcd *ehci, int portnum, int new_owner)
533 {
534 u32 __iomem *status_reg;
535 u32 port_status;
536 int try;
537
538 status_reg = &ehci->regs->port_status[portnum];
539
540 /*
541 * The controller won't set the OWNER bit if the port is
542 * enabled, so this loop will sometimes require at least two
543 * iterations: one to disable the port and one to set OWNER.
544 */
545 for (try = 4; try > 0; --try) {
546 spin_lock_irq(&ehci->lock);
547 port_status = ehci_readl(ehci, status_reg);
548 if ((port_status & PORT_OWNER) == new_owner
549 || (port_status & (PORT_OWNER | PORT_CONNECT))
550 == 0)
551 try = 0;
552 else {
553 port_status ^= PORT_OWNER;
554 port_status &= ~(PORT_PE | PORT_RWC_BITS);
555 ehci_writel(ehci, port_status, status_reg);
556 }
557 spin_unlock_irq(&ehci->lock);
558 if (try > 1)
559 msleep(5);
560 }
561 }
562
563 /*-------------------------------------------------------------------------*/
564
565 static int check_reset_complete (
566 struct ehci_hcd *ehci,
567 int index,
568 u32 __iomem *status_reg,
569 int port_status
570 ) {
571 if (!(port_status & PORT_CONNECT))
572 return port_status;
573
574 /* if reset finished and it's still not enabled -- handoff */
575 if (!(port_status & PORT_PE)) {
576
577 /* with integrated TT, there's nobody to hand it to! */
578 if (ehci_is_TDI(ehci)) {
579 ehci_dbg (ehci,
580 "Failed to enable port %d on root hub TT\n",
581 index+1);
582 return port_status;
583 }
584
585 ehci_dbg (ehci, "port %d full speed --> companion\n",
586 index + 1);
587
588 // what happens if HCS_N_CC(params) == 0 ?
589 port_status |= PORT_OWNER;
590 port_status &= ~PORT_RWC_BITS;
591 ehci_writel(ehci, port_status, status_reg);
592
593 /* ensure 440EPX ohci controller state is operational */
594 if (ehci->has_amcc_usb23)
595 set_ohci_hcfs(ehci, 1);
596 } else {
597 ehci_dbg(ehci, "port %d reset complete, port enabled\n",
598 index + 1);
599 /* ensure 440EPx ohci controller state is suspended */
600 if (ehci->has_amcc_usb23)
601 set_ohci_hcfs(ehci, 0);
602 }
603
604 return port_status;
605 }
606
607 /*-------------------------------------------------------------------------*/
608
609
610 /* build "status change" packet (one or two bytes) from HC registers */
611
612 static int
613 ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
614 {
615 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
616 u32 temp, status;
617 u32 mask;
618 int ports, i, retval = 1;
619 unsigned long flags;
620 u32 ppcd = ~0;
621
622 /* init status to no-changes */
623 buf [0] = 0;
624 ports = HCS_N_PORTS (ehci->hcs_params);
625 if (ports > 7) {
626 buf [1] = 0;
627 retval++;
628 }
629
630 /* Inform the core about resumes-in-progress by returning
631 * a non-zero value even if there are no status changes.
632 */
633 status = ehci->resuming_ports;
634
635 /* Some boards (mostly VIA?) report bogus overcurrent indications,
636 * causing massive log spam unless we completely ignore them. It
637 * may be relevant that VIA VT8235 controllers, where PORT_POWER is
638 * always set, seem to clear PORT_OCC and PORT_CSC when writing to
639 * PORT_POWER; that's surprising, but maybe within-spec.
640 */
641 if (!ignore_oc)
642 mask = PORT_CSC | PORT_PEC | PORT_OCC;
643 else
644 mask = PORT_CSC | PORT_PEC;
645 // PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
646
647 /* no hub change reports (bit 0) for now (power, ...) */
648
649 /* port N changes (bit N)? */
650 spin_lock_irqsave (&ehci->lock, flags);
651
652 /* get per-port change detect bits */
653 if (ehci->has_ppcd)
654 ppcd = ehci_readl(ehci, &ehci->regs->status) >> 16;
655
656 for (i = 0; i < ports; i++) {
657 /* leverage per-port change bits feature */
658 if (ppcd & (1 << i))
659 temp = ehci_readl(ehci, &ehci->regs->port_status[i]);
660 else
661 temp = 0;
662
663 /*
664 * Return status information even for ports with OWNER set.
665 * Otherwise hub_wq wouldn't see the disconnect event when a
666 * high-speed device is switched over to the companion
667 * controller by the user.
668 */
669
670 if ((temp & mask) != 0 || test_bit(i, &ehci->port_c_suspend)
671 || (ehci->reset_done[i] && time_after_eq(
672 jiffies, ehci->reset_done[i]))) {
673 if (i < 7)
674 buf [0] |= 1 << (i + 1);
675 else
676 buf [1] |= 1 << (i - 7);
677 status = STS_PCD;
678 }
679 }
680
681 /* If a resume is in progress, make sure it can finish */
682 if (ehci->resuming_ports)
683 mod_timer(&hcd->rh_timer, jiffies + msecs_to_jiffies(25));
684
685 spin_unlock_irqrestore (&ehci->lock, flags);
686 return status ? retval : 0;
687 }
688
689 /*-------------------------------------------------------------------------*/
690
691 static void
692 ehci_hub_descriptor (
693 struct ehci_hcd *ehci,
694 struct usb_hub_descriptor *desc
695 ) {
696 int ports = HCS_N_PORTS (ehci->hcs_params);
697 u16 temp;
698
699 desc->bDescriptorType = USB_DT_HUB;
700 desc->bPwrOn2PwrGood = 10; /* ehci 1.0, 2.3.9 says 20ms max */
701 desc->bHubContrCurrent = 0;
702
703 desc->bNbrPorts = ports;
704 temp = 1 + (ports / 8);
705 desc->bDescLength = 7 + 2 * temp;
706
707 /* two bitmaps: ports removable, and usb 1.0 legacy PortPwrCtrlMask */
708 memset(&desc->u.hs.DeviceRemovable[0], 0, temp);
709 memset(&desc->u.hs.DeviceRemovable[temp], 0xff, temp);
710
711 temp = HUB_CHAR_INDV_PORT_OCPM; /* per-port overcurrent reporting */
712 if (HCS_PPC (ehci->hcs_params))
713 temp |= HUB_CHAR_INDV_PORT_LPSM; /* per-port power control */
714 else
715 temp |= HUB_CHAR_NO_LPSM; /* no power switching */
716 #if 0
717 // re-enable when we support USB_PORT_FEAT_INDICATOR below.
718 if (HCS_INDICATOR (ehci->hcs_params))
719 temp |= HUB_CHAR_PORTIND; /* per-port indicators (LEDs) */
720 #endif
721 desc->wHubCharacteristics = cpu_to_le16(temp);
722 }
723
724 /*-------------------------------------------------------------------------*/
725 #ifdef CONFIG_USB_HCD_TEST_MODE
726
727 #define EHSET_TEST_SINGLE_STEP_SET_FEATURE 0x06
728
729 static void usb_ehset_completion(struct urb *urb)
730 {
731 struct completion *done = urb->context;
732
733 complete(done);
734 }
735 static int submit_single_step_set_feature(
736 struct usb_hcd *hcd,
737 struct urb *urb,
738 int is_setup
739 );
740
741 /*
742 * Allocate and initialize a control URB. This request will be used by the
743 * EHSET SINGLE_STEP_SET_FEATURE test in which the DATA and STATUS stages
744 * of the GetDescriptor request are sent 15 seconds after the SETUP stage.
745 * Return NULL if failed.
746 */
747 static struct urb *request_single_step_set_feature_urb(
748 struct usb_device *udev,
749 void *dr,
750 void *buf,
751 struct completion *done
752 ) {
753 struct urb *urb;
754 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
755 struct usb_host_endpoint *ep;
756
757 urb = usb_alloc_urb(0, GFP_KERNEL);
758 if (!urb)
759 return NULL;
760
761 urb->pipe = usb_rcvctrlpipe(udev, 0);
762 ep = (usb_pipein(urb->pipe) ? udev->ep_in : udev->ep_out)
763 [usb_pipeendpoint(urb->pipe)];
764 if (!ep) {
765 usb_free_urb(urb);
766 return NULL;
767 }
768
769 urb->ep = ep;
770 urb->dev = udev;
771 urb->setup_packet = (void *)dr;
772 urb->transfer_buffer = buf;
773 urb->transfer_buffer_length = USB_DT_DEVICE_SIZE;
774 urb->complete = usb_ehset_completion;
775 urb->status = -EINPROGRESS;
776 urb->actual_length = 0;
777 urb->transfer_flags = URB_DIR_IN;
778 usb_get_urb(urb);
779 atomic_inc(&urb->use_count);
780 atomic_inc(&urb->dev->urbnum);
781 urb->setup_dma = dma_map_single(
782 hcd->self.controller,
783 urb->setup_packet,
784 sizeof(struct usb_ctrlrequest),
785 DMA_TO_DEVICE);
786 urb->transfer_dma = dma_map_single(
787 hcd->self.controller,
788 urb->transfer_buffer,
789 urb->transfer_buffer_length,
790 DMA_FROM_DEVICE);
791 urb->context = done;
792 return urb;
793 }
794
795 static int ehset_single_step_set_feature(struct usb_hcd *hcd, int port)
796 {
797 int retval = -ENOMEM;
798 struct usb_ctrlrequest *dr;
799 struct urb *urb;
800 struct usb_device *udev;
801 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
802 struct usb_device_descriptor *buf;
803 DECLARE_COMPLETION_ONSTACK(done);
804
805 /* Obtain udev of the rhub's child port */
806 udev = usb_hub_find_child(hcd->self.root_hub, port);
807 if (!udev) {
808 ehci_err(ehci, "No device attached to the RootHub\n");
809 return -ENODEV;
810 }
811 buf = kmalloc(USB_DT_DEVICE_SIZE, GFP_KERNEL);
812 if (!buf)
813 return -ENOMEM;
814
815 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
816 if (!dr) {
817 kfree(buf);
818 return -ENOMEM;
819 }
820
821 /* Fill Setup packet for GetDescriptor */
822 dr->bRequestType = USB_DIR_IN;
823 dr->bRequest = USB_REQ_GET_DESCRIPTOR;
824 dr->wValue = cpu_to_le16(USB_DT_DEVICE << 8);
825 dr->wIndex = 0;
826 dr->wLength = cpu_to_le16(USB_DT_DEVICE_SIZE);
827 urb = request_single_step_set_feature_urb(udev, dr, buf, &done);
828 if (!urb)
829 goto cleanup;
830
831 /* Submit just the SETUP stage */
832 retval = submit_single_step_set_feature(hcd, urb, 1);
833 if (retval)
834 goto out1;
835 if (!wait_for_completion_timeout(&done, msecs_to_jiffies(2000))) {
836 usb_kill_urb(urb);
837 retval = -ETIMEDOUT;
838 ehci_err(ehci, "%s SETUP stage timed out on ep0\n", __func__);
839 goto out1;
840 }
841 msleep(15 * 1000);
842
843 /* Complete remaining DATA and STATUS stages using the same URB */
844 urb->status = -EINPROGRESS;
845 usb_get_urb(urb);
846 atomic_inc(&urb->use_count);
847 atomic_inc(&urb->dev->urbnum);
848 retval = submit_single_step_set_feature(hcd, urb, 0);
849 if (!retval && !wait_for_completion_timeout(&done,
850 msecs_to_jiffies(2000))) {
851 usb_kill_urb(urb);
852 retval = -ETIMEDOUT;
853 ehci_err(ehci, "%s IN stage timed out on ep0\n", __func__);
854 }
855 out1:
856 usb_free_urb(urb);
857 cleanup:
858 kfree(dr);
859 kfree(buf);
860 return retval;
861 }
862 #endif /* CONFIG_USB_HCD_TEST_MODE */
863 /*-------------------------------------------------------------------------*/
864
865 int ehci_hub_control(
866 struct usb_hcd *hcd,
867 u16 typeReq,
868 u16 wValue,
869 u16 wIndex,
870 char *buf,
871 u16 wLength
872 ) {
873 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
874 int ports = HCS_N_PORTS (ehci->hcs_params);
875 u32 __iomem *status_reg = &ehci->regs->port_status[
876 (wIndex & 0xff) - 1];
877 u32 __iomem *hostpc_reg = &ehci->regs->hostpc[(wIndex & 0xff) - 1];
878 u32 temp, temp1, status;
879 unsigned long flags;
880 int retval = 0;
881 unsigned selector;
882
883 /*
884 * FIXME: support SetPortFeatures USB_PORT_FEAT_INDICATOR.
885 * HCS_INDICATOR may say we can change LEDs to off/amber/green.
886 * (track current state ourselves) ... blink for diagnostics,
887 * power, "this is the one", etc. EHCI spec supports this.
888 */
889
890 spin_lock_irqsave (&ehci->lock, flags);
891 switch (typeReq) {
892 case ClearHubFeature:
893 switch (wValue) {
894 case C_HUB_LOCAL_POWER:
895 case C_HUB_OVER_CURRENT:
896 /* no hub-wide feature/status flags */
897 break;
898 default:
899 goto error;
900 }
901 break;
902 case ClearPortFeature:
903 if (!wIndex || wIndex > ports)
904 goto error;
905 wIndex--;
906 temp = ehci_readl(ehci, status_reg);
907 temp &= ~PORT_RWC_BITS;
908
909 /*
910 * Even if OWNER is set, so the port is owned by the
911 * companion controller, hub_wq needs to be able to clear
912 * the port-change status bits (especially
913 * USB_PORT_STAT_C_CONNECTION).
914 */
915
916 switch (wValue) {
917 case USB_PORT_FEAT_ENABLE:
918 ehci_writel(ehci, temp & ~PORT_PE, status_reg);
919 break;
920 case USB_PORT_FEAT_C_ENABLE:
921 ehci_writel(ehci, temp | PORT_PEC, status_reg);
922 break;
923 case USB_PORT_FEAT_SUSPEND:
924 if (temp & PORT_RESET)
925 goto error;
926 if (ehci->no_selective_suspend)
927 break;
928 #ifdef CONFIG_USB_OTG
929 if ((hcd->self.otg_port == (wIndex + 1))
930 && hcd->self.b_hnp_enable) {
931 otg_start_hnp(hcd->usb_phy->otg);
932 break;
933 }
934 #endif
935 if (!(temp & PORT_SUSPEND))
936 break;
937 if ((temp & PORT_PE) == 0)
938 goto error;
939
940 /* clear phy low-power mode before resume */
941 if (ehci->has_tdi_phy_lpm) {
942 temp1 = ehci_readl(ehci, hostpc_reg);
943 ehci_writel(ehci, temp1 & ~HOSTPC_PHCD,
944 hostpc_reg);
945 spin_unlock_irqrestore(&ehci->lock, flags);
946 msleep(5);/* wait to leave low-power mode */
947 spin_lock_irqsave(&ehci->lock, flags);
948 }
949 /* resume signaling for 20 msec */
950 temp &= ~PORT_WAKE_BITS;
951 ehci_writel(ehci, temp | PORT_RESUME, status_reg);
952 ehci->reset_done[wIndex] = jiffies
953 + msecs_to_jiffies(USB_RESUME_TIMEOUT);
954 set_bit(wIndex, &ehci->resuming_ports);
955 usb_hcd_start_port_resume(&hcd->self, wIndex);
956 break;
957 case USB_PORT_FEAT_C_SUSPEND:
958 clear_bit(wIndex, &ehci->port_c_suspend);
959 break;
960 case USB_PORT_FEAT_POWER:
961 if (HCS_PPC(ehci->hcs_params)) {
962 spin_unlock_irqrestore(&ehci->lock, flags);
963 ehci_port_power(ehci, wIndex, false);
964 spin_lock_irqsave(&ehci->lock, flags);
965 }
966 break;
967 case USB_PORT_FEAT_C_CONNECTION:
968 ehci_writel(ehci, temp | PORT_CSC, status_reg);
969 break;
970 case USB_PORT_FEAT_C_OVER_CURRENT:
971 ehci_writel(ehci, temp | PORT_OCC, status_reg);
972 break;
973 case USB_PORT_FEAT_C_RESET:
974 /* GetPortStatus clears reset */
975 break;
976 default:
977 goto error;
978 }
979 ehci_readl(ehci, &ehci->regs->command); /* unblock posted write */
980 break;
981 case GetHubDescriptor:
982 ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
983 buf);
984 break;
985 case GetHubStatus:
986 /* no hub-wide feature/status flags */
987 memset (buf, 0, 4);
988 //cpu_to_le32s ((u32 *) buf);
989 break;
990 case GetPortStatus:
991 if (!wIndex || wIndex > ports)
992 goto error;
993 wIndex--;
994 status = 0;
995 temp = ehci_readl(ehci, status_reg);
996
997 // wPortChange bits
998 if (temp & PORT_CSC)
999 status |= USB_PORT_STAT_C_CONNECTION << 16;
1000 if (temp & PORT_PEC)
1001 status |= USB_PORT_STAT_C_ENABLE << 16;
1002
1003 if ((temp & PORT_OCC) && !ignore_oc){
1004 status |= USB_PORT_STAT_C_OVERCURRENT << 16;
1005
1006 /*
1007 * Hubs should disable port power on over-current.
1008 * However, not all EHCI implementations do this
1009 * automatically, even if they _do_ support per-port
1010 * power switching; they're allowed to just limit the
1011 * current. hub_wq will turn the power back on.
1012 */
1013 if (((temp & PORT_OC) || (ehci->need_oc_pp_cycle))
1014 && HCS_PPC(ehci->hcs_params)) {
1015 spin_unlock_irqrestore(&ehci->lock, flags);
1016 ehci_port_power(ehci, wIndex, false);
1017 spin_lock_irqsave(&ehci->lock, flags);
1018 temp = ehci_readl(ehci, status_reg);
1019 }
1020 }
1021
1022 /* no reset or resume pending */
1023 if (!ehci->reset_done[wIndex]) {
1024
1025 /* Remote Wakeup received? */
1026 if (temp & PORT_RESUME) {
1027 /* resume signaling for 20 msec */
1028 ehci->reset_done[wIndex] = jiffies
1029 + msecs_to_jiffies(20);
1030 usb_hcd_start_port_resume(&hcd->self, wIndex);
1031 set_bit(wIndex, &ehci->resuming_ports);
1032 /* check the port again */
1033 mod_timer(&ehci_to_hcd(ehci)->rh_timer,
1034 ehci->reset_done[wIndex]);
1035 }
1036
1037 /* reset or resume not yet complete */
1038 } else if (!time_after_eq(jiffies, ehci->reset_done[wIndex])) {
1039 ; /* wait until it is complete */
1040
1041 /* resume completed */
1042 } else if (test_bit(wIndex, &ehci->resuming_ports)) {
1043 clear_bit(wIndex, &ehci->suspended_ports);
1044 set_bit(wIndex, &ehci->port_c_suspend);
1045 ehci->reset_done[wIndex] = 0;
1046 usb_hcd_end_port_resume(&hcd->self, wIndex);
1047
1048 /* stop resume signaling */
1049 temp &= ~(PORT_RWC_BITS | PORT_SUSPEND | PORT_RESUME);
1050 ehci_writel(ehci, temp, status_reg);
1051 clear_bit(wIndex, &ehci->resuming_ports);
1052 retval = ehci_handshake(ehci, status_reg,
1053 PORT_RESUME, 0, 2000 /* 2msec */);
1054 if (retval != 0) {
1055 ehci_err(ehci, "port %d resume error %d\n",
1056 wIndex + 1, retval);
1057 goto error;
1058 }
1059 temp = ehci_readl(ehci, status_reg);
1060
1061 /* whoever resets must GetPortStatus to complete it!! */
1062 } else {
1063 status |= USB_PORT_STAT_C_RESET << 16;
1064 ehci->reset_done [wIndex] = 0;
1065
1066 /* force reset to complete */
1067 ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESET),
1068 status_reg);
1069 /* REVISIT: some hardware needs 550+ usec to clear
1070 * this bit; seems too long to spin routinely...
1071 */
1072 retval = ehci_handshake(ehci, status_reg,
1073 PORT_RESET, 0, 1000);
1074 if (retval != 0) {
1075 ehci_err (ehci, "port %d reset error %d\n",
1076 wIndex + 1, retval);
1077 goto error;
1078 }
1079
1080 /* see what we found out */
1081 temp = check_reset_complete (ehci, wIndex, status_reg,
1082 ehci_readl(ehci, status_reg));
1083 }
1084
1085 /* transfer dedicated ports to the companion hc */
1086 if ((temp & PORT_CONNECT) &&
1087 test_bit(wIndex, &ehci->companion_ports)) {
1088 temp &= ~PORT_RWC_BITS;
1089 temp |= PORT_OWNER;
1090 ehci_writel(ehci, temp, status_reg);
1091 ehci_dbg(ehci, "port %d --> companion\n", wIndex + 1);
1092 temp = ehci_readl(ehci, status_reg);
1093 }
1094
1095 /*
1096 * Even if OWNER is set, there's no harm letting hub_wq
1097 * see the wPortStatus values (they should all be 0 except
1098 * for PORT_POWER anyway).
1099 */
1100
1101 if (temp & PORT_CONNECT) {
1102 status |= USB_PORT_STAT_CONNECTION;
1103 // status may be from integrated TT
1104 if (ehci->has_hostpc) {
1105 temp1 = ehci_readl(ehci, hostpc_reg);
1106 status |= ehci_port_speed(ehci, temp1);
1107 } else
1108 status |= ehci_port_speed(ehci, temp);
1109 }
1110 if (temp & PORT_PE)
1111 status |= USB_PORT_STAT_ENABLE;
1112
1113 /* maybe the port was unsuspended without our knowledge */
1114 if (temp & (PORT_SUSPEND|PORT_RESUME)) {
1115 status |= USB_PORT_STAT_SUSPEND;
1116 } else if (test_bit(wIndex, &ehci->suspended_ports)) {
1117 clear_bit(wIndex, &ehci->suspended_ports);
1118 clear_bit(wIndex, &ehci->resuming_ports);
1119 ehci->reset_done[wIndex] = 0;
1120 if (temp & PORT_PE)
1121 set_bit(wIndex, &ehci->port_c_suspend);
1122 usb_hcd_end_port_resume(&hcd->self, wIndex);
1123 }
1124
1125 if (temp & PORT_OC)
1126 status |= USB_PORT_STAT_OVERCURRENT;
1127 if (temp & PORT_RESET)
1128 status |= USB_PORT_STAT_RESET;
1129 if (temp & PORT_POWER)
1130 status |= USB_PORT_STAT_POWER;
1131 if (test_bit(wIndex, &ehci->port_c_suspend))
1132 status |= USB_PORT_STAT_C_SUSPEND << 16;
1133
1134 if (status & ~0xffff) /* only if wPortChange is interesting */
1135 dbg_port(ehci, "GetStatus", wIndex + 1, temp);
1136 put_unaligned_le32(status, buf);
1137 break;
1138 case SetHubFeature:
1139 switch (wValue) {
1140 case C_HUB_LOCAL_POWER:
1141 case C_HUB_OVER_CURRENT:
1142 /* no hub-wide feature/status flags */
1143 break;
1144 default:
1145 goto error;
1146 }
1147 break;
1148 case SetPortFeature:
1149 selector = wIndex >> 8;
1150 wIndex &= 0xff;
1151 if (unlikely(ehci->debug)) {
1152 /* If the debug port is active any port
1153 * feature requests should get denied */
1154 if (wIndex == HCS_DEBUG_PORT(ehci->hcs_params) &&
1155 (readl(&ehci->debug->control) & DBGP_ENABLED)) {
1156 retval = -ENODEV;
1157 goto error_exit;
1158 }
1159 }
1160 if (!wIndex || wIndex > ports)
1161 goto error;
1162 wIndex--;
1163 temp = ehci_readl(ehci, status_reg);
1164 if (temp & PORT_OWNER)
1165 break;
1166
1167 temp &= ~PORT_RWC_BITS;
1168 switch (wValue) {
1169 case USB_PORT_FEAT_SUSPEND:
1170 if (ehci->no_selective_suspend)
1171 break;
1172 if ((temp & PORT_PE) == 0
1173 || (temp & PORT_RESET) != 0)
1174 goto error;
1175
1176 /* After above check the port must be connected.
1177 * Set appropriate bit thus could put phy into low power
1178 * mode if we have tdi_phy_lpm feature
1179 */
1180 temp &= ~PORT_WKCONN_E;
1181 temp |= PORT_WKDISC_E | PORT_WKOC_E;
1182 ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
1183 if (ehci->has_tdi_phy_lpm) {
1184 spin_unlock_irqrestore(&ehci->lock, flags);
1185 msleep(5);/* 5ms for HCD enter low pwr mode */
1186 spin_lock_irqsave(&ehci->lock, flags);
1187 temp1 = ehci_readl(ehci, hostpc_reg);
1188 ehci_writel(ehci, temp1 | HOSTPC_PHCD,
1189 hostpc_reg);
1190 temp1 = ehci_readl(ehci, hostpc_reg);
1191 ehci_dbg(ehci, "Port%d phy low pwr mode %s\n",
1192 wIndex, (temp1 & HOSTPC_PHCD) ?
1193 "succeeded" : "failed");
1194 }
1195 set_bit(wIndex, &ehci->suspended_ports);
1196 break;
1197 case USB_PORT_FEAT_POWER:
1198 if (HCS_PPC(ehci->hcs_params)) {
1199 spin_unlock_irqrestore(&ehci->lock, flags);
1200 ehci_port_power(ehci, wIndex, true);
1201 spin_lock_irqsave(&ehci->lock, flags);
1202 }
1203 break;
1204 case USB_PORT_FEAT_RESET:
1205 if (temp & (PORT_SUSPEND|PORT_RESUME))
1206 goto error;
1207 /* line status bits may report this as low speed,
1208 * which can be fine if this root hub has a
1209 * transaction translator built in.
1210 */
1211 if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
1212 && !ehci_is_TDI(ehci)
1213 && PORT_USB11 (temp)) {
1214 ehci_dbg (ehci,
1215 "port %d low speed --> companion\n",
1216 wIndex + 1);
1217 temp |= PORT_OWNER;
1218 } else {
1219 temp |= PORT_RESET;
1220 temp &= ~PORT_PE;
1221
1222 /*
1223 * caller must wait, then call GetPortStatus
1224 * usb 2.0 spec says 50 ms resets on root
1225 */
1226 ehci->reset_done [wIndex] = jiffies
1227 + msecs_to_jiffies (50);
1228
1229 /*
1230 * Force full-speed connect for FSL high-speed
1231 * erratum; disable HS Chirp by setting PFSC bit
1232 */
1233 if (ehci_has_fsl_hs_errata(ehci))
1234 temp |= (1 << PORTSC_FSL_PFSC);
1235 }
1236 ehci_writel(ehci, temp, status_reg);
1237 break;
1238
1239 /* For downstream facing ports (these): one hub port is put
1240 * into test mode according to USB2 11.24.2.13, then the hub
1241 * must be reset (which for root hub now means rmmod+modprobe,
1242 * or else system reboot). See EHCI 2.3.9 and 4.14 for info
1243 * about the EHCI-specific stuff.
1244 */
1245 case USB_PORT_FEAT_TEST:
1246 #ifdef CONFIG_USB_HCD_TEST_MODE
1247 if (selector == EHSET_TEST_SINGLE_STEP_SET_FEATURE) {
1248 spin_unlock_irqrestore(&ehci->lock, flags);
1249 retval = ehset_single_step_set_feature(hcd,
1250 wIndex + 1);
1251 spin_lock_irqsave(&ehci->lock, flags);
1252 break;
1253 }
1254 #endif
1255 if (!selector || selector > 5)
1256 goto error;
1257 spin_unlock_irqrestore(&ehci->lock, flags);
1258 ehci_quiesce(ehci);
1259 spin_lock_irqsave(&ehci->lock, flags);
1260
1261 /* Put all enabled ports into suspend */
1262 while (ports--) {
1263 u32 __iomem *sreg =
1264 &ehci->regs->port_status[ports];
1265
1266 temp = ehci_readl(ehci, sreg) & ~PORT_RWC_BITS;
1267 if (temp & PORT_PE)
1268 ehci_writel(ehci, temp | PORT_SUSPEND,
1269 sreg);
1270 }
1271
1272 spin_unlock_irqrestore(&ehci->lock, flags);
1273 ehci_halt(ehci);
1274 spin_lock_irqsave(&ehci->lock, flags);
1275
1276 temp = ehci_readl(ehci, status_reg);
1277 temp |= selector << 16;
1278 ehci_writel(ehci, temp, status_reg);
1279 break;
1280
1281 default:
1282 goto error;
1283 }
1284 ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
1285 break;
1286
1287 default:
1288 error:
1289 /* "stall" on error */
1290 retval = -EPIPE;
1291 }
1292 error_exit:
1293 spin_unlock_irqrestore (&ehci->lock, flags);
1294 return retval;
1295 }
1296 EXPORT_SYMBOL_GPL(ehci_hub_control);
1297
1298 static void ehci_relinquish_port(struct usb_hcd *hcd, int portnum)
1299 {
1300 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
1301
1302 if (ehci_is_TDI(ehci))
1303 return;
1304 set_owner(ehci, --portnum, PORT_OWNER);
1305 }
1306
1307 static int ehci_port_handed_over(struct usb_hcd *hcd, int portnum)
1308 {
1309 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
1310 u32 __iomem *reg;
1311
1312 if (ehci_is_TDI(ehci))
1313 return 0;
1314 reg = &ehci->regs->port_status[portnum - 1];
1315 return ehci_readl(ehci, reg) & PORT_OWNER;
1316 }
1317
1318 static int ehci_port_power(struct ehci_hcd *ehci, int portnum, bool enable)
1319 {
1320 struct usb_hcd *hcd = ehci_to_hcd(ehci);
1321 u32 __iomem *status_reg = &ehci->regs->port_status[portnum];
1322 u32 temp = ehci_readl(ehci, status_reg) & ~PORT_RWC_BITS;
1323
1324 if (enable)
1325 ehci_writel(ehci, temp | PORT_POWER, status_reg);
1326 else
1327 ehci_writel(ehci, temp & ~PORT_POWER, status_reg);
1328
1329 if (hcd->driver->port_power)
1330 hcd->driver->port_power(hcd, portnum, enable);
1331
1332 return 0;
1333 }
Linux kernel - Deliverables
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