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Merge tag 'for-4.1' of git://git.kernel.org/pub/scm/linux/kernel/git/kishon/linux...
[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 int persist_enabled_on_companion(struct usb_device *udev, void *unused)
37 {
38 return !udev->maxchild && udev->persist_enabled &&
39 udev->bus->root_hub->speed < USB_SPEED_HIGH;
40 }
41
42 /* After a power loss, ports that were owned by the companion must be
43 * reset so that the companion can still own them.
44 */
45 static void ehci_handover_companion_ports(struct ehci_hcd *ehci)
46 {
47 u32 __iomem *reg;
48 u32 status;
49 int port;
50 __le32 buf;
51 struct usb_hcd *hcd = ehci_to_hcd(ehci);
52
53 if (!ehci->owned_ports)
54 return;
55
56 /*
57 * USB 1.1 devices are mostly HIDs, which don't need to persist across
58 * suspends. If we ensure that none of our companion's devices have
59 * persist_enabled (by looking through all USB 1.1 buses in the system),
60 * we can skip this and avoid slowing resume down. Devices without
61 * persist will just get reenumerated shortly after resume anyway.
62 */
63 if (!usb_for_each_dev(NULL, persist_enabled_on_companion))
64 return;
65
66 /* Make sure the ports are powered */
67 port = HCS_N_PORTS(ehci->hcs_params);
68 while (port--) {
69 if (test_bit(port, &ehci->owned_ports)) {
70 reg = &ehci->regs->port_status[port];
71 status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
72 if (!(status & PORT_POWER))
73 ehci_port_power(ehci, port, true);
74 }
75 }
76
77 /* Give the connections some time to appear */
78 msleep(20);
79
80 spin_lock_irq(&ehci->lock);
81 port = HCS_N_PORTS(ehci->hcs_params);
82 while (port--) {
83 if (test_bit(port, &ehci->owned_ports)) {
84 reg = &ehci->regs->port_status[port];
85 status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
86
87 /* Port already owned by companion? */
88 if (status & PORT_OWNER)
89 clear_bit(port, &ehci->owned_ports);
90 else if (test_bit(port, &ehci->companion_ports))
91 ehci_writel(ehci, status & ~PORT_PE, reg);
92 else {
93 spin_unlock_irq(&ehci->lock);
94 ehci_hub_control(hcd, SetPortFeature,
95 USB_PORT_FEAT_RESET, port + 1,
96 NULL, 0);
97 spin_lock_irq(&ehci->lock);
98 }
99 }
100 }
101 spin_unlock_irq(&ehci->lock);
102
103 if (!ehci->owned_ports)
104 return;
105 msleep(90); /* Wait for resets to complete */
106
107 spin_lock_irq(&ehci->lock);
108 port = HCS_N_PORTS(ehci->hcs_params);
109 while (port--) {
110 if (test_bit(port, &ehci->owned_ports)) {
111 spin_unlock_irq(&ehci->lock);
112 ehci_hub_control(hcd, GetPortStatus,
113 0, port + 1,
114 (char *) &buf, sizeof(buf));
115 spin_lock_irq(&ehci->lock);
116
117 /* The companion should now own the port,
118 * but if something went wrong the port must not
119 * remain enabled.
120 */
121 reg = &ehci->regs->port_status[port];
122 status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
123 if (status & PORT_OWNER)
124 ehci_writel(ehci, status | PORT_CSC, reg);
125 else {
126 ehci_dbg(ehci, "failed handover port %d: %x\n",
127 port + 1, status);
128 ehci_writel(ehci, status & ~PORT_PE, reg);
129 }
130 }
131 }
132
133 ehci->owned_ports = 0;
134 spin_unlock_irq(&ehci->lock);
135 }
136
137 static int ehci_port_change(struct ehci_hcd *ehci)
138 {
139 int i = HCS_N_PORTS(ehci->hcs_params);
140
141 /* First check if the controller indicates a change event */
142
143 if (ehci_readl(ehci, &ehci->regs->status) & STS_PCD)
144 return 1;
145
146 /*
147 * Not all controllers appear to update this while going from D3 to D0,
148 * so check the individual port status registers as well
149 */
150
151 while (i--)
152 if (ehci_readl(ehci, &ehci->regs->port_status[i]) & PORT_CSC)
153 return 1;
154
155 return 0;
156 }
157
158 static void ehci_adjust_port_wakeup_flags(struct ehci_hcd *ehci,
159 bool suspending, bool do_wakeup)
160 {
161 int port;
162 u32 temp;
163
164 /* If remote wakeup is enabled for the root hub but disabled
165 * for the controller, we must adjust all the port wakeup flags
166 * when the controller is suspended or resumed. In all other
167 * cases they don't need to be changed.
168 */
169 if (!ehci_to_hcd(ehci)->self.root_hub->do_remote_wakeup || do_wakeup)
170 return;
171
172 spin_lock_irq(&ehci->lock);
173
174 /* clear phy low-power mode before changing wakeup flags */
175 if (ehci->has_tdi_phy_lpm) {
176 port = HCS_N_PORTS(ehci->hcs_params);
177 while (port--) {
178 u32 __iomem *hostpc_reg = &ehci->regs->hostpc[port];
179
180 temp = ehci_readl(ehci, hostpc_reg);
181 ehci_writel(ehci, temp & ~HOSTPC_PHCD, hostpc_reg);
182 }
183 spin_unlock_irq(&ehci->lock);
184 msleep(5);
185 spin_lock_irq(&ehci->lock);
186 }
187
188 port = HCS_N_PORTS(ehci->hcs_params);
189 while (port--) {
190 u32 __iomem *reg = &ehci->regs->port_status[port];
191 u32 t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
192 u32 t2 = t1 & ~PORT_WAKE_BITS;
193
194 /* If we are suspending the controller, clear the flags.
195 * If we are resuming the controller, set the wakeup flags.
196 */
197 if (!suspending) {
198 if (t1 & PORT_CONNECT)
199 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
200 else
201 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
202 }
203 ehci_writel(ehci, t2, reg);
204 }
205
206 /* enter phy low-power mode again */
207 if (ehci->has_tdi_phy_lpm) {
208 port = HCS_N_PORTS(ehci->hcs_params);
209 while (port--) {
210 u32 __iomem *hostpc_reg = &ehci->regs->hostpc[port];
211
212 temp = ehci_readl(ehci, hostpc_reg);
213 ehci_writel(ehci, temp | HOSTPC_PHCD, hostpc_reg);
214 }
215 }
216
217 /* Does the root hub have a port wakeup pending? */
218 if (!suspending && ehci_port_change(ehci))
219 usb_hcd_resume_root_hub(ehci_to_hcd(ehci));
220
221 spin_unlock_irq(&ehci->lock);
222 }
223
224 static int ehci_bus_suspend (struct usb_hcd *hcd)
225 {
226 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
227 int port;
228 int mask;
229 int changed;
230 bool fs_idle_delay;
231
232 ehci_dbg(ehci, "suspend root hub\n");
233
234 if (time_before (jiffies, ehci->next_statechange))
235 msleep(5);
236
237 /* stop the schedules */
238 ehci_quiesce(ehci);
239
240 spin_lock_irq (&ehci->lock);
241 if (ehci->rh_state < EHCI_RH_RUNNING)
242 goto done;
243
244 /* Once the controller is stopped, port resumes that are already
245 * in progress won't complete. Hence if remote wakeup is enabled
246 * for the root hub and any ports are in the middle of a resume or
247 * remote wakeup, we must fail the suspend.
248 */
249 if (hcd->self.root_hub->do_remote_wakeup) {
250 if (ehci->resuming_ports) {
251 spin_unlock_irq(&ehci->lock);
252 ehci_dbg(ehci, "suspend failed because a port is resuming\n");
253 return -EBUSY;
254 }
255 }
256
257 /* Unlike other USB host controller types, EHCI doesn't have
258 * any notion of "global" or bus-wide suspend. The driver has
259 * to manually suspend all the active unsuspended ports, and
260 * then manually resume them in the bus_resume() routine.
261 */
262 ehci->bus_suspended = 0;
263 ehci->owned_ports = 0;
264 changed = 0;
265 fs_idle_delay = false;
266 port = HCS_N_PORTS(ehci->hcs_params);
267 while (port--) {
268 u32 __iomem *reg = &ehci->regs->port_status [port];
269 u32 t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
270 u32 t2 = t1 & ~PORT_WAKE_BITS;
271
272 /* keep track of which ports we suspend */
273 if (t1 & PORT_OWNER)
274 set_bit(port, &ehci->owned_ports);
275 else if ((t1 & PORT_PE) && !(t1 & PORT_SUSPEND)) {
276 t2 |= PORT_SUSPEND;
277 set_bit(port, &ehci->bus_suspended);
278 }
279
280 /* enable remote wakeup on all ports, if told to do so */
281 if (hcd->self.root_hub->do_remote_wakeup) {
282 /* only enable appropriate wake bits, otherwise the
283 * hardware can not go phy low power mode. If a race
284 * condition happens here(connection change during bits
285 * set), the port change detection will finally fix it.
286 */
287 if (t1 & PORT_CONNECT)
288 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
289 else
290 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
291 }
292
293 if (t1 != t2) {
294 /*
295 * On some controllers, Wake-On-Disconnect will
296 * generate false wakeup signals until the bus
297 * switches over to full-speed idle. For their
298 * sake, add a delay if we need one.
299 */
300 if ((t2 & PORT_WKDISC_E) &&
301 ehci_port_speed(ehci, t2) ==
302 USB_PORT_STAT_HIGH_SPEED)
303 fs_idle_delay = true;
304 ehci_writel(ehci, t2, reg);
305 changed = 1;
306 }
307 }
308 spin_unlock_irq(&ehci->lock);
309
310 if ((changed && ehci->has_tdi_phy_lpm) || fs_idle_delay) {
311 /*
312 * Wait for HCD to enter low-power mode or for the bus
313 * to switch to full-speed idle.
314 */
315 usleep_range(5000, 5500);
316 }
317
318 if (changed && ehci->has_tdi_phy_lpm) {
319 spin_lock_irq(&ehci->lock);
320 port = HCS_N_PORTS(ehci->hcs_params);
321 while (port--) {
322 u32 __iomem *hostpc_reg = &ehci->regs->hostpc[port];
323 u32 t3;
324
325 t3 = ehci_readl(ehci, hostpc_reg);
326 ehci_writel(ehci, t3 | HOSTPC_PHCD, hostpc_reg);
327 t3 = ehci_readl(ehci, hostpc_reg);
328 ehci_dbg(ehci, "Port %d phy low-power mode %s\n",
329 port, (t3 & HOSTPC_PHCD) ?
330 "succeeded" : "failed");
331 }
332 spin_unlock_irq(&ehci->lock);
333 }
334
335 /* Apparently some devices need a >= 1-uframe delay here */
336 if (ehci->bus_suspended)
337 udelay(150);
338
339 /* turn off now-idle HC */
340 ehci_halt (ehci);
341
342 spin_lock_irq(&ehci->lock);
343 if (ehci->enabled_hrtimer_events & BIT(EHCI_HRTIMER_POLL_DEAD))
344 ehci_handle_controller_death(ehci);
345 if (ehci->rh_state != EHCI_RH_RUNNING)
346 goto done;
347 ehci->rh_state = EHCI_RH_SUSPENDED;
348
349 end_unlink_async(ehci);
350 unlink_empty_async_suspended(ehci);
351 ehci_handle_start_intr_unlinks(ehci);
352 ehci_handle_intr_unlinks(ehci);
353 end_free_itds(ehci);
354
355 /* allow remote wakeup */
356 mask = INTR_MASK;
357 if (!hcd->self.root_hub->do_remote_wakeup)
358 mask &= ~STS_PCD;
359 ehci_writel(ehci, mask, &ehci->regs->intr_enable);
360 ehci_readl(ehci, &ehci->regs->intr_enable);
361
362 done:
363 ehci->next_statechange = jiffies + msecs_to_jiffies(10);
364 ehci->enabled_hrtimer_events = 0;
365 ehci->next_hrtimer_event = EHCI_HRTIMER_NO_EVENT;
366 spin_unlock_irq (&ehci->lock);
367
368 hrtimer_cancel(&ehci->hrtimer);
369 return 0;
370 }
371
372
373 /* caller has locked the root hub, and should reset/reinit on error */
374 static int ehci_bus_resume (struct usb_hcd *hcd)
375 {
376 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
377 u32 temp;
378 u32 power_okay;
379 int i;
380 unsigned long resume_needed = 0;
381
382 if (time_before (jiffies, ehci->next_statechange))
383 msleep(5);
384 spin_lock_irq (&ehci->lock);
385 if (!HCD_HW_ACCESSIBLE(hcd) || ehci->shutdown)
386 goto shutdown;
387
388 if (unlikely(ehci->debug)) {
389 if (!dbgp_reset_prep(hcd))
390 ehci->debug = NULL;
391 else
392 dbgp_external_startup(hcd);
393 }
394
395 /* Ideally and we've got a real resume here, and no port's power
396 * was lost. (For PCI, that means Vaux was maintained.) But we
397 * could instead be restoring a swsusp snapshot -- so that BIOS was
398 * the last user of the controller, not reset/pm hardware keeping
399 * state we gave to it.
400 */
401 power_okay = ehci_readl(ehci, &ehci->regs->intr_enable);
402 ehci_dbg(ehci, "resume root hub%s\n",
403 power_okay ? "" : " after power loss");
404
405 /* at least some APM implementations will try to deliver
406 * IRQs right away, so delay them until we're ready.
407 */
408 ehci_writel(ehci, 0, &ehci->regs->intr_enable);
409
410 /* re-init operational registers */
411 ehci_writel(ehci, 0, &ehci->regs->segment);
412 ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
413 ehci_writel(ehci, (u32) ehci->async->qh_dma, &ehci->regs->async_next);
414
415 /* restore CMD_RUN, framelist size, and irq threshold */
416 ehci->command |= CMD_RUN;
417 ehci_writel(ehci, ehci->command, &ehci->regs->command);
418 ehci->rh_state = EHCI_RH_RUNNING;
419
420 /*
421 * According to Bugzilla #8190, the port status for some controllers
422 * will be wrong without a delay. At their wrong status, the port
423 * is enabled, but not suspended neither resumed.
424 */
425 i = HCS_N_PORTS(ehci->hcs_params);
426 while (i--) {
427 temp = ehci_readl(ehci, &ehci->regs->port_status[i]);
428 if ((temp & PORT_PE) &&
429 !(temp & (PORT_SUSPEND | PORT_RESUME))) {
430 ehci_dbg(ehci, "Port status(0x%x) is wrong\n", temp);
431 spin_unlock_irq(&ehci->lock);
432 msleep(8);
433 spin_lock_irq(&ehci->lock);
434 break;
435 }
436 }
437
438 if (ehci->shutdown)
439 goto shutdown;
440
441 /* clear phy low-power mode before resume */
442 if (ehci->bus_suspended && ehci->has_tdi_phy_lpm) {
443 i = HCS_N_PORTS(ehci->hcs_params);
444 while (i--) {
445 if (test_bit(i, &ehci->bus_suspended)) {
446 u32 __iomem *hostpc_reg =
447 &ehci->regs->hostpc[i];
448
449 temp = ehci_readl(ehci, hostpc_reg);
450 ehci_writel(ehci, temp & ~HOSTPC_PHCD,
451 hostpc_reg);
452 }
453 }
454 spin_unlock_irq(&ehci->lock);
455 msleep(5);
456 spin_lock_irq(&ehci->lock);
457 if (ehci->shutdown)
458 goto shutdown;
459 }
460
461 /* manually resume the ports we suspended during bus_suspend() */
462 i = HCS_N_PORTS (ehci->hcs_params);
463 while (i--) {
464 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
465 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
466 if (test_bit(i, &ehci->bus_suspended) &&
467 (temp & PORT_SUSPEND)) {
468 temp |= PORT_RESUME;
469 set_bit(i, &resume_needed);
470 }
471 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
472 }
473
474 /*
475 * msleep for USB_RESUME_TIMEOUT ms only if code is trying to resume
476 * port
477 */
478 if (resume_needed) {
479 spin_unlock_irq(&ehci->lock);
480 msleep(USB_RESUME_TIMEOUT);
481 spin_lock_irq(&ehci->lock);
482 if (ehci->shutdown)
483 goto shutdown;
484 }
485
486 i = HCS_N_PORTS (ehci->hcs_params);
487 while (i--) {
488 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
489 if (test_bit(i, &resume_needed)) {
490 temp &= ~(PORT_RWC_BITS | PORT_SUSPEND | PORT_RESUME);
491 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
492 }
493 }
494
495 ehci->next_statechange = jiffies + msecs_to_jiffies(5);
496 spin_unlock_irq(&ehci->lock);
497
498 ehci_handover_companion_ports(ehci);
499
500 /* Now we can safely re-enable irqs */
501 spin_lock_irq(&ehci->lock);
502 if (ehci->shutdown)
503 goto shutdown;
504 ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
505 (void) ehci_readl(ehci, &ehci->regs->intr_enable);
506 spin_unlock_irq(&ehci->lock);
507
508 return 0;
509
510 shutdown:
511 spin_unlock_irq(&ehci->lock);
512 return -ESHUTDOWN;
513 }
514
515 #else
516
517 #define ehci_bus_suspend NULL
518 #define ehci_bus_resume NULL
519
520 #endif /* CONFIG_PM */
521
522 /*-------------------------------------------------------------------------*/
523
524 /*
525 * Sets the owner of a port
526 */
527 static void set_owner(struct ehci_hcd *ehci, int portnum, int new_owner)
528 {
529 u32 __iomem *status_reg;
530 u32 port_status;
531 int try;
532
533 status_reg = &ehci->regs->port_status[portnum];
534
535 /*
536 * The controller won't set the OWNER bit if the port is
537 * enabled, so this loop will sometimes require at least two
538 * iterations: one to disable the port and one to set OWNER.
539 */
540 for (try = 4; try > 0; --try) {
541 spin_lock_irq(&ehci->lock);
542 port_status = ehci_readl(ehci, status_reg);
543 if ((port_status & PORT_OWNER) == new_owner
544 || (port_status & (PORT_OWNER | PORT_CONNECT))
545 == 0)
546 try = 0;
547 else {
548 port_status ^= PORT_OWNER;
549 port_status &= ~(PORT_PE | PORT_RWC_BITS);
550 ehci_writel(ehci, port_status, status_reg);
551 }
552 spin_unlock_irq(&ehci->lock);
553 if (try > 1)
554 msleep(5);
555 }
556 }
557
558 /*-------------------------------------------------------------------------*/
559
560 static int check_reset_complete (
561 struct ehci_hcd *ehci,
562 int index,
563 u32 __iomem *status_reg,
564 int port_status
565 ) {
566 if (!(port_status & PORT_CONNECT))
567 return port_status;
568
569 /* if reset finished and it's still not enabled -- handoff */
570 if (!(port_status & PORT_PE)) {
571
572 /* with integrated TT, there's nobody to hand it to! */
573 if (ehci_is_TDI(ehci)) {
574 ehci_dbg (ehci,
575 "Failed to enable port %d on root hub TT\n",
576 index+1);
577 return port_status;
578 }
579
580 ehci_dbg (ehci, "port %d full speed --> companion\n",
581 index + 1);
582
583 // what happens if HCS_N_CC(params) == 0 ?
584 port_status |= PORT_OWNER;
585 port_status &= ~PORT_RWC_BITS;
586 ehci_writel(ehci, port_status, status_reg);
587
588 /* ensure 440EPX ohci controller state is operational */
589 if (ehci->has_amcc_usb23)
590 set_ohci_hcfs(ehci, 1);
591 } else {
592 ehci_dbg(ehci, "port %d reset complete, port enabled\n",
593 index + 1);
594 /* ensure 440EPx ohci controller state is suspended */
595 if (ehci->has_amcc_usb23)
596 set_ohci_hcfs(ehci, 0);
597 }
598
599 return port_status;
600 }
601
602 /*-------------------------------------------------------------------------*/
603
604
605 /* build "status change" packet (one or two bytes) from HC registers */
606
607 static int
608 ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
609 {
610 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
611 u32 temp, status;
612 u32 mask;
613 int ports, i, retval = 1;
614 unsigned long flags;
615 u32 ppcd = ~0;
616
617 /* init status to no-changes */
618 buf [0] = 0;
619 ports = HCS_N_PORTS (ehci->hcs_params);
620 if (ports > 7) {
621 buf [1] = 0;
622 retval++;
623 }
624
625 /* Inform the core about resumes-in-progress by returning
626 * a non-zero value even if there are no status changes.
627 */
628 status = ehci->resuming_ports;
629
630 /* Some boards (mostly VIA?) report bogus overcurrent indications,
631 * causing massive log spam unless we completely ignore them. It
632 * may be relevant that VIA VT8235 controllers, where PORT_POWER is
633 * always set, seem to clear PORT_OCC and PORT_CSC when writing to
634 * PORT_POWER; that's surprising, but maybe within-spec.
635 */
636 if (!ignore_oc)
637 mask = PORT_CSC | PORT_PEC | PORT_OCC;
638 else
639 mask = PORT_CSC | PORT_PEC;
640 // PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
641
642 /* no hub change reports (bit 0) for now (power, ...) */
643
644 /* port N changes (bit N)? */
645 spin_lock_irqsave (&ehci->lock, flags);
646
647 /* get per-port change detect bits */
648 if (ehci->has_ppcd)
649 ppcd = ehci_readl(ehci, &ehci->regs->status) >> 16;
650
651 for (i = 0; i < ports; i++) {
652 /* leverage per-port change bits feature */
653 if (ppcd & (1 << i))
654 temp = ehci_readl(ehci, &ehci->regs->port_status[i]);
655 else
656 temp = 0;
657
658 /*
659 * Return status information even for ports with OWNER set.
660 * Otherwise hub_wq wouldn't see the disconnect event when a
661 * high-speed device is switched over to the companion
662 * controller by the user.
663 */
664
665 if ((temp & mask) != 0 || test_bit(i, &ehci->port_c_suspend)
666 || (ehci->reset_done[i] && time_after_eq(
667 jiffies, ehci->reset_done[i]))) {
668 if (i < 7)
669 buf [0] |= 1 << (i + 1);
670 else
671 buf [1] |= 1 << (i - 7);
672 status = STS_PCD;
673 }
674 }
675
676 /* If a resume is in progress, make sure it can finish */
677 if (ehci->resuming_ports)
678 mod_timer(&hcd->rh_timer, jiffies + msecs_to_jiffies(25));
679
680 spin_unlock_irqrestore (&ehci->lock, flags);
681 return status ? retval : 0;
682 }
683
684 /*-------------------------------------------------------------------------*/
685
686 static void
687 ehci_hub_descriptor (
688 struct ehci_hcd *ehci,
689 struct usb_hub_descriptor *desc
690 ) {
691 int ports = HCS_N_PORTS (ehci->hcs_params);
692 u16 temp;
693
694 desc->bDescriptorType = USB_DT_HUB;
695 desc->bPwrOn2PwrGood = 10; /* ehci 1.0, 2.3.9 says 20ms max */
696 desc->bHubContrCurrent = 0;
697
698 desc->bNbrPorts = ports;
699 temp = 1 + (ports / 8);
700 desc->bDescLength = 7 + 2 * temp;
701
702 /* two bitmaps: ports removable, and usb 1.0 legacy PortPwrCtrlMask */
703 memset(&desc->u.hs.DeviceRemovable[0], 0, temp);
704 memset(&desc->u.hs.DeviceRemovable[temp], 0xff, temp);
705
706 temp = HUB_CHAR_INDV_PORT_OCPM; /* per-port overcurrent reporting */
707 if (HCS_PPC (ehci->hcs_params))
708 temp |= HUB_CHAR_INDV_PORT_LPSM; /* per-port power control */
709 else
710 temp |= HUB_CHAR_NO_LPSM; /* no power switching */
711 #if 0
712 // re-enable when we support USB_PORT_FEAT_INDICATOR below.
713 if (HCS_INDICATOR (ehci->hcs_params))
714 temp |= HUB_CHAR_PORTIND; /* per-port indicators (LEDs) */
715 #endif
716 desc->wHubCharacteristics = cpu_to_le16(temp);
717 }
718
719 /*-------------------------------------------------------------------------*/
720 #ifdef CONFIG_USB_HCD_TEST_MODE
721
722 #define EHSET_TEST_SINGLE_STEP_SET_FEATURE 0x06
723
724 static void usb_ehset_completion(struct urb *urb)
725 {
726 struct completion *done = urb->context;
727
728 complete(done);
729 }
730 static int submit_single_step_set_feature(
731 struct usb_hcd *hcd,
732 struct urb *urb,
733 int is_setup
734 );
735
736 /*
737 * Allocate and initialize a control URB. This request will be used by the
738 * EHSET SINGLE_STEP_SET_FEATURE test in which the DATA and STATUS stages
739 * of the GetDescriptor request are sent 15 seconds after the SETUP stage.
740 * Return NULL if failed.
741 */
742 static struct urb *request_single_step_set_feature_urb(
743 struct usb_device *udev,
744 void *dr,
745 void *buf,
746 struct completion *done
747 ) {
748 struct urb *urb;
749 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
750 struct usb_host_endpoint *ep;
751
752 urb = usb_alloc_urb(0, GFP_KERNEL);
753 if (!urb)
754 return NULL;
755
756 urb->pipe = usb_rcvctrlpipe(udev, 0);
757 ep = (usb_pipein(urb->pipe) ? udev->ep_in : udev->ep_out)
758 [usb_pipeendpoint(urb->pipe)];
759 if (!ep) {
760 usb_free_urb(urb);
761 return NULL;
762 }
763
764 urb->ep = ep;
765 urb->dev = udev;
766 urb->setup_packet = (void *)dr;
767 urb->transfer_buffer = buf;
768 urb->transfer_buffer_length = USB_DT_DEVICE_SIZE;
769 urb->complete = usb_ehset_completion;
770 urb->status = -EINPROGRESS;
771 urb->actual_length = 0;
772 urb->transfer_flags = URB_DIR_IN;
773 usb_get_urb(urb);
774 atomic_inc(&urb->use_count);
775 atomic_inc(&urb->dev->urbnum);
776 urb->setup_dma = dma_map_single(
777 hcd->self.controller,
778 urb->setup_packet,
779 sizeof(struct usb_ctrlrequest),
780 DMA_TO_DEVICE);
781 urb->transfer_dma = dma_map_single(
782 hcd->self.controller,
783 urb->transfer_buffer,
784 urb->transfer_buffer_length,
785 DMA_FROM_DEVICE);
786 urb->context = done;
787 return urb;
788 }
789
790 static int ehset_single_step_set_feature(struct usb_hcd *hcd, int port)
791 {
792 int retval = -ENOMEM;
793 struct usb_ctrlrequest *dr;
794 struct urb *urb;
795 struct usb_device *udev;
796 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
797 struct usb_device_descriptor *buf;
798 DECLARE_COMPLETION_ONSTACK(done);
799
800 /* Obtain udev of the rhub's child port */
801 udev = usb_hub_find_child(hcd->self.root_hub, port);
802 if (!udev) {
803 ehci_err(ehci, "No device attached to the RootHub\n");
804 return -ENODEV;
805 }
806 buf = kmalloc(USB_DT_DEVICE_SIZE, GFP_KERNEL);
807 if (!buf)
808 return -ENOMEM;
809
810 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
811 if (!dr) {
812 kfree(buf);
813 return -ENOMEM;
814 }
815
816 /* Fill Setup packet for GetDescriptor */
817 dr->bRequestType = USB_DIR_IN;
818 dr->bRequest = USB_REQ_GET_DESCRIPTOR;
819 dr->wValue = cpu_to_le16(USB_DT_DEVICE << 8);
820 dr->wIndex = 0;
821 dr->wLength = cpu_to_le16(USB_DT_DEVICE_SIZE);
822 urb = request_single_step_set_feature_urb(udev, dr, buf, &done);
823 if (!urb)
824 goto cleanup;
825
826 /* Submit just the SETUP stage */
827 retval = submit_single_step_set_feature(hcd, urb, 1);
828 if (retval)
829 goto out1;
830 if (!wait_for_completion_timeout(&done, msecs_to_jiffies(2000))) {
831 usb_kill_urb(urb);
832 retval = -ETIMEDOUT;
833 ehci_err(ehci, "%s SETUP stage timed out on ep0\n", __func__);
834 goto out1;
835 }
836 msleep(15 * 1000);
837
838 /* Complete remaining DATA and STATUS stages using the same URB */
839 urb->status = -EINPROGRESS;
840 usb_get_urb(urb);
841 atomic_inc(&urb->use_count);
842 atomic_inc(&urb->dev->urbnum);
843 retval = submit_single_step_set_feature(hcd, urb, 0);
844 if (!retval && !wait_for_completion_timeout(&done,
845 msecs_to_jiffies(2000))) {
846 usb_kill_urb(urb);
847 retval = -ETIMEDOUT;
848 ehci_err(ehci, "%s IN stage timed out on ep0\n", __func__);
849 }
850 out1:
851 usb_free_urb(urb);
852 cleanup:
853 kfree(dr);
854 kfree(buf);
855 return retval;
856 }
857 #endif /* CONFIG_USB_HCD_TEST_MODE */
858 /*-------------------------------------------------------------------------*/
859
860 int ehci_hub_control(
861 struct usb_hcd *hcd,
862 u16 typeReq,
863 u16 wValue,
864 u16 wIndex,
865 char *buf,
866 u16 wLength
867 ) {
868 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
869 int ports = HCS_N_PORTS (ehci->hcs_params);
870 u32 __iomem *status_reg = &ehci->regs->port_status[
871 (wIndex & 0xff) - 1];
872 u32 __iomem *hostpc_reg = &ehci->regs->hostpc[(wIndex & 0xff) - 1];
873 u32 temp, temp1, status;
874 unsigned long flags;
875 int retval = 0;
876 unsigned selector;
877
878 /*
879 * FIXME: support SetPortFeatures USB_PORT_FEAT_INDICATOR.
880 * HCS_INDICATOR may say we can change LEDs to off/amber/green.
881 * (track current state ourselves) ... blink for diagnostics,
882 * power, "this is the one", etc. EHCI spec supports this.
883 */
884
885 spin_lock_irqsave (&ehci->lock, flags);
886 switch (typeReq) {
887 case ClearHubFeature:
888 switch (wValue) {
889 case C_HUB_LOCAL_POWER:
890 case C_HUB_OVER_CURRENT:
891 /* no hub-wide feature/status flags */
892 break;
893 default:
894 goto error;
895 }
896 break;
897 case ClearPortFeature:
898 if (!wIndex || wIndex > ports)
899 goto error;
900 wIndex--;
901 temp = ehci_readl(ehci, status_reg);
902 temp &= ~PORT_RWC_BITS;
903
904 /*
905 * Even if OWNER is set, so the port is owned by the
906 * companion controller, hub_wq needs to be able to clear
907 * the port-change status bits (especially
908 * USB_PORT_STAT_C_CONNECTION).
909 */
910
911 switch (wValue) {
912 case USB_PORT_FEAT_ENABLE:
913 ehci_writel(ehci, temp & ~PORT_PE, status_reg);
914 break;
915 case USB_PORT_FEAT_C_ENABLE:
916 ehci_writel(ehci, temp | PORT_PEC, status_reg);
917 break;
918 case USB_PORT_FEAT_SUSPEND:
919 if (temp & PORT_RESET)
920 goto error;
921 if (ehci->no_selective_suspend)
922 break;
923 #ifdef CONFIG_USB_OTG
924 if ((hcd->self.otg_port == (wIndex + 1))
925 && hcd->self.b_hnp_enable) {
926 otg_start_hnp(hcd->usb_phy->otg);
927 break;
928 }
929 #endif
930 if (!(temp & PORT_SUSPEND))
931 break;
932 if ((temp & PORT_PE) == 0)
933 goto error;
934
935 /* clear phy low-power mode before resume */
936 if (ehci->has_tdi_phy_lpm) {
937 temp1 = ehci_readl(ehci, hostpc_reg);
938 ehci_writel(ehci, temp1 & ~HOSTPC_PHCD,
939 hostpc_reg);
940 spin_unlock_irqrestore(&ehci->lock, flags);
941 msleep(5);/* wait to leave low-power mode */
942 spin_lock_irqsave(&ehci->lock, flags);
943 }
944 /* resume signaling for 20 msec */
945 temp &= ~PORT_WAKE_BITS;
946 ehci_writel(ehci, temp | PORT_RESUME, status_reg);
947 ehci->reset_done[wIndex] = jiffies
948 + msecs_to_jiffies(USB_RESUME_TIMEOUT);
949 set_bit(wIndex, &ehci->resuming_ports);
950 usb_hcd_start_port_resume(&hcd->self, wIndex);
951 break;
952 case USB_PORT_FEAT_C_SUSPEND:
953 clear_bit(wIndex, &ehci->port_c_suspend);
954 break;
955 case USB_PORT_FEAT_POWER:
956 if (HCS_PPC(ehci->hcs_params)) {
957 spin_unlock_irqrestore(&ehci->lock, flags);
958 ehci_port_power(ehci, wIndex, false);
959 spin_lock_irqsave(&ehci->lock, flags);
960 }
961 break;
962 case USB_PORT_FEAT_C_CONNECTION:
963 ehci_writel(ehci, temp | PORT_CSC, status_reg);
964 break;
965 case USB_PORT_FEAT_C_OVER_CURRENT:
966 ehci_writel(ehci, temp | PORT_OCC, status_reg);
967 break;
968 case USB_PORT_FEAT_C_RESET:
969 /* GetPortStatus clears reset */
970 break;
971 default:
972 goto error;
973 }
974 ehci_readl(ehci, &ehci->regs->command); /* unblock posted write */
975 break;
976 case GetHubDescriptor:
977 ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
978 buf);
979 break;
980 case GetHubStatus:
981 /* no hub-wide feature/status flags */
982 memset (buf, 0, 4);
983 //cpu_to_le32s ((u32 *) buf);
984 break;
985 case GetPortStatus:
986 if (!wIndex || wIndex > ports)
987 goto error;
988 wIndex--;
989 status = 0;
990 temp = ehci_readl(ehci, status_reg);
991
992 // wPortChange bits
993 if (temp & PORT_CSC)
994 status |= USB_PORT_STAT_C_CONNECTION << 16;
995 if (temp & PORT_PEC)
996 status |= USB_PORT_STAT_C_ENABLE << 16;
997
998 if ((temp & PORT_OCC) && !ignore_oc){
999 status |= USB_PORT_STAT_C_OVERCURRENT << 16;
1000
1001 /*
1002 * Hubs should disable port power on over-current.
1003 * However, not all EHCI implementations do this
1004 * automatically, even if they _do_ support per-port
1005 * power switching; they're allowed to just limit the
1006 * current. hub_wq will turn the power back on.
1007 */
1008 if (((temp & PORT_OC) || (ehci->need_oc_pp_cycle))
1009 && HCS_PPC(ehci->hcs_params)) {
1010 spin_unlock_irqrestore(&ehci->lock, flags);
1011 ehci_port_power(ehci, wIndex, false);
1012 spin_lock_irqsave(&ehci->lock, flags);
1013 temp = ehci_readl(ehci, status_reg);
1014 }
1015 }
1016
1017 /* no reset or resume pending */
1018 if (!ehci->reset_done[wIndex]) {
1019
1020 /* Remote Wakeup received? */
1021 if (temp & PORT_RESUME) {
1022 /* resume signaling for 20 msec */
1023 ehci->reset_done[wIndex] = jiffies
1024 + msecs_to_jiffies(20);
1025 usb_hcd_start_port_resume(&hcd->self, wIndex);
1026 set_bit(wIndex, &ehci->resuming_ports);
1027 /* check the port again */
1028 mod_timer(&ehci_to_hcd(ehci)->rh_timer,
1029 ehci->reset_done[wIndex]);
1030 }
1031
1032 /* reset or resume not yet complete */
1033 } else if (!time_after_eq(jiffies, ehci->reset_done[wIndex])) {
1034 ; /* wait until it is complete */
1035
1036 /* resume completed */
1037 } else if (test_bit(wIndex, &ehci->resuming_ports)) {
1038 clear_bit(wIndex, &ehci->suspended_ports);
1039 set_bit(wIndex, &ehci->port_c_suspend);
1040 ehci->reset_done[wIndex] = 0;
1041 usb_hcd_end_port_resume(&hcd->self, wIndex);
1042
1043 /* stop resume signaling */
1044 temp &= ~(PORT_RWC_BITS | PORT_SUSPEND | PORT_RESUME);
1045 ehci_writel(ehci, temp, status_reg);
1046 clear_bit(wIndex, &ehci->resuming_ports);
1047 retval = ehci_handshake(ehci, status_reg,
1048 PORT_RESUME, 0, 2000 /* 2msec */);
1049 if (retval != 0) {
1050 ehci_err(ehci, "port %d resume error %d\n",
1051 wIndex + 1, retval);
1052 goto error;
1053 }
1054 temp = ehci_readl(ehci, status_reg);
1055
1056 /* whoever resets must GetPortStatus to complete it!! */
1057 } else {
1058 status |= USB_PORT_STAT_C_RESET << 16;
1059 ehci->reset_done [wIndex] = 0;
1060
1061 /* force reset to complete */
1062 ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESET),
1063 status_reg);
1064 /* REVISIT: some hardware needs 550+ usec to clear
1065 * this bit; seems too long to spin routinely...
1066 */
1067 retval = ehci_handshake(ehci, status_reg,
1068 PORT_RESET, 0, 1000);
1069 if (retval != 0) {
1070 ehci_err (ehci, "port %d reset error %d\n",
1071 wIndex + 1, retval);
1072 goto error;
1073 }
1074
1075 /* see what we found out */
1076 temp = check_reset_complete (ehci, wIndex, status_reg,
1077 ehci_readl(ehci, status_reg));
1078 }
1079
1080 /* transfer dedicated ports to the companion hc */
1081 if ((temp & PORT_CONNECT) &&
1082 test_bit(wIndex, &ehci->companion_ports)) {
1083 temp &= ~PORT_RWC_BITS;
1084 temp |= PORT_OWNER;
1085 ehci_writel(ehci, temp, status_reg);
1086 ehci_dbg(ehci, "port %d --> companion\n", wIndex + 1);
1087 temp = ehci_readl(ehci, status_reg);
1088 }
1089
1090 /*
1091 * Even if OWNER is set, there's no harm letting hub_wq
1092 * see the wPortStatus values (they should all be 0 except
1093 * for PORT_POWER anyway).
1094 */
1095
1096 if (temp & PORT_CONNECT) {
1097 status |= USB_PORT_STAT_CONNECTION;
1098 // status may be from integrated TT
1099 if (ehci->has_hostpc) {
1100 temp1 = ehci_readl(ehci, hostpc_reg);
1101 status |= ehci_port_speed(ehci, temp1);
1102 } else
1103 status |= ehci_port_speed(ehci, temp);
1104 }
1105 if (temp & PORT_PE)
1106 status |= USB_PORT_STAT_ENABLE;
1107
1108 /* maybe the port was unsuspended without our knowledge */
1109 if (temp & (PORT_SUSPEND|PORT_RESUME)) {
1110 status |= USB_PORT_STAT_SUSPEND;
1111 } else if (test_bit(wIndex, &ehci->suspended_ports)) {
1112 clear_bit(wIndex, &ehci->suspended_ports);
1113 clear_bit(wIndex, &ehci->resuming_ports);
1114 ehci->reset_done[wIndex] = 0;
1115 if (temp & PORT_PE)
1116 set_bit(wIndex, &ehci->port_c_suspend);
1117 usb_hcd_end_port_resume(&hcd->self, wIndex);
1118 }
1119
1120 if (temp & PORT_OC)
1121 status |= USB_PORT_STAT_OVERCURRENT;
1122 if (temp & PORT_RESET)
1123 status |= USB_PORT_STAT_RESET;
1124 if (temp & PORT_POWER)
1125 status |= USB_PORT_STAT_POWER;
1126 if (test_bit(wIndex, &ehci->port_c_suspend))
1127 status |= USB_PORT_STAT_C_SUSPEND << 16;
1128
1129 if (status & ~0xffff) /* only if wPortChange is interesting */
1130 dbg_port(ehci, "GetStatus", wIndex + 1, temp);
1131 put_unaligned_le32(status, buf);
1132 break;
1133 case SetHubFeature:
1134 switch (wValue) {
1135 case C_HUB_LOCAL_POWER:
1136 case C_HUB_OVER_CURRENT:
1137 /* no hub-wide feature/status flags */
1138 break;
1139 default:
1140 goto error;
1141 }
1142 break;
1143 case SetPortFeature:
1144 selector = wIndex >> 8;
1145 wIndex &= 0xff;
1146 if (unlikely(ehci->debug)) {
1147 /* If the debug port is active any port
1148 * feature requests should get denied */
1149 if (wIndex == HCS_DEBUG_PORT(ehci->hcs_params) &&
1150 (readl(&ehci->debug->control) & DBGP_ENABLED)) {
1151 retval = -ENODEV;
1152 goto error_exit;
1153 }
1154 }
1155 if (!wIndex || wIndex > ports)
1156 goto error;
1157 wIndex--;
1158 temp = ehci_readl(ehci, status_reg);
1159 if (temp & PORT_OWNER)
1160 break;
1161
1162 temp &= ~PORT_RWC_BITS;
1163 switch (wValue) {
1164 case USB_PORT_FEAT_SUSPEND:
1165 if (ehci->no_selective_suspend)
1166 break;
1167 if ((temp & PORT_PE) == 0
1168 || (temp & PORT_RESET) != 0)
1169 goto error;
1170
1171 /* After above check the port must be connected.
1172 * Set appropriate bit thus could put phy into low power
1173 * mode if we have tdi_phy_lpm feature
1174 */
1175 temp &= ~PORT_WKCONN_E;
1176 temp |= PORT_WKDISC_E | PORT_WKOC_E;
1177 ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
1178 if (ehci->has_tdi_phy_lpm) {
1179 spin_unlock_irqrestore(&ehci->lock, flags);
1180 msleep(5);/* 5ms for HCD enter low pwr mode */
1181 spin_lock_irqsave(&ehci->lock, flags);
1182 temp1 = ehci_readl(ehci, hostpc_reg);
1183 ehci_writel(ehci, temp1 | HOSTPC_PHCD,
1184 hostpc_reg);
1185 temp1 = ehci_readl(ehci, hostpc_reg);
1186 ehci_dbg(ehci, "Port%d phy low pwr mode %s\n",
1187 wIndex, (temp1 & HOSTPC_PHCD) ?
1188 "succeeded" : "failed");
1189 }
1190 set_bit(wIndex, &ehci->suspended_ports);
1191 break;
1192 case USB_PORT_FEAT_POWER:
1193 if (HCS_PPC(ehci->hcs_params)) {
1194 spin_unlock_irqrestore(&ehci->lock, flags);
1195 ehci_port_power(ehci, wIndex, true);
1196 spin_lock_irqsave(&ehci->lock, flags);
1197 }
1198 break;
1199 case USB_PORT_FEAT_RESET:
1200 if (temp & (PORT_SUSPEND|PORT_RESUME))
1201 goto error;
1202 /* line status bits may report this as low speed,
1203 * which can be fine if this root hub has a
1204 * transaction translator built in.
1205 */
1206 if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
1207 && !ehci_is_TDI(ehci)
1208 && PORT_USB11 (temp)) {
1209 ehci_dbg (ehci,
1210 "port %d low speed --> companion\n",
1211 wIndex + 1);
1212 temp |= PORT_OWNER;
1213 } else {
1214 temp |= PORT_RESET;
1215 temp &= ~PORT_PE;
1216
1217 /*
1218 * caller must wait, then call GetPortStatus
1219 * usb 2.0 spec says 50 ms resets on root
1220 */
1221 ehci->reset_done [wIndex] = jiffies
1222 + msecs_to_jiffies (50);
1223 }
1224 ehci_writel(ehci, temp, status_reg);
1225 break;
1226
1227 /* For downstream facing ports (these): one hub port is put
1228 * into test mode according to USB2 11.24.2.13, then the hub
1229 * must be reset (which for root hub now means rmmod+modprobe,
1230 * or else system reboot). See EHCI 2.3.9 and 4.14 for info
1231 * about the EHCI-specific stuff.
1232 */
1233 case USB_PORT_FEAT_TEST:
1234 #ifdef CONFIG_USB_HCD_TEST_MODE
1235 if (selector == EHSET_TEST_SINGLE_STEP_SET_FEATURE) {
1236 spin_unlock_irqrestore(&ehci->lock, flags);
1237 retval = ehset_single_step_set_feature(hcd,
1238 wIndex + 1);
1239 spin_lock_irqsave(&ehci->lock, flags);
1240 break;
1241 }
1242 #endif
1243 if (!selector || selector > 5)
1244 goto error;
1245 spin_unlock_irqrestore(&ehci->lock, flags);
1246 ehci_quiesce(ehci);
1247 spin_lock_irqsave(&ehci->lock, flags);
1248
1249 /* Put all enabled ports into suspend */
1250 while (ports--) {
1251 u32 __iomem *sreg =
1252 &ehci->regs->port_status[ports];
1253
1254 temp = ehci_readl(ehci, sreg) & ~PORT_RWC_BITS;
1255 if (temp & PORT_PE)
1256 ehci_writel(ehci, temp | PORT_SUSPEND,
1257 sreg);
1258 }
1259
1260 spin_unlock_irqrestore(&ehci->lock, flags);
1261 ehci_halt(ehci);
1262 spin_lock_irqsave(&ehci->lock, flags);
1263
1264 temp = ehci_readl(ehci, status_reg);
1265 temp |= selector << 16;
1266 ehci_writel(ehci, temp, status_reg);
1267 break;
1268
1269 default:
1270 goto error;
1271 }
1272 ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
1273 break;
1274
1275 default:
1276 error:
1277 /* "stall" on error */
1278 retval = -EPIPE;
1279 }
1280 error_exit:
1281 spin_unlock_irqrestore (&ehci->lock, flags);
1282 return retval;
1283 }
1284 EXPORT_SYMBOL_GPL(ehci_hub_control);
1285
1286 static void ehci_relinquish_port(struct usb_hcd *hcd, int portnum)
1287 {
1288 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
1289
1290 if (ehci_is_TDI(ehci))
1291 return;
1292 set_owner(ehci, --portnum, PORT_OWNER);
1293 }
1294
1295 static int ehci_port_handed_over(struct usb_hcd *hcd, int portnum)
1296 {
1297 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
1298 u32 __iomem *reg;
1299
1300 if (ehci_is_TDI(ehci))
1301 return 0;
1302 reg = &ehci->regs->port_status[portnum - 1];
1303 return ehci_readl(ehci, reg) & PORT_OWNER;
1304 }
1305
1306 static int ehci_port_power(struct ehci_hcd *ehci, int portnum, bool enable)
1307 {
1308 struct usb_hcd *hcd = ehci_to_hcd(ehci);
1309 u32 __iomem *status_reg = &ehci->regs->port_status[portnum];
1310 u32 temp = ehci_readl(ehci, status_reg) & ~PORT_RWC_BITS;
1311
1312 if (enable)
1313 ehci_writel(ehci, temp | PORT_POWER, status_reg);
1314 else
1315 ehci_writel(ehci, temp & ~PORT_POWER, status_reg);
1316
1317 if (hcd->driver->port_power)
1318 hcd->driver->port_power(hcd, portnum, enable);
1319
1320 return 0;
1321 }
Linux kernel - Deliverables
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