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Merge tag 'for-linus-4.5-merge-window' of git://git.kernel.org/pub/scm/linux/kernel...
[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 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 EXPORT_SYMBOL_GPL(ehci_adjust_port_wakeup_flags);
224
225 static int ehci_bus_suspend (struct usb_hcd *hcd)
226 {
227 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
228 int port;
229 int mask;
230 int changed;
231 bool fs_idle_delay;
232
233 ehci_dbg(ehci, "suspend root hub\n");
234
235 if (time_before (jiffies, ehci->next_statechange))
236 msleep(5);
237
238 /* stop the schedules */
239 ehci_quiesce(ehci);
240
241 spin_lock_irq (&ehci->lock);
242 if (ehci->rh_state < EHCI_RH_RUNNING)
243 goto done;
244
245 /* Once the controller is stopped, port resumes that are already
246 * in progress won't complete. Hence if remote wakeup is enabled
247 * for the root hub and any ports are in the middle of a resume or
248 * remote wakeup, we must fail the suspend.
249 */
250 if (hcd->self.root_hub->do_remote_wakeup) {
251 if (ehci->resuming_ports) {
252 spin_unlock_irq(&ehci->lock);
253 ehci_dbg(ehci, "suspend failed because a port is resuming\n");
254 return -EBUSY;
255 }
256 }
257
258 /* Unlike other USB host controller types, EHCI doesn't have
259 * any notion of "global" or bus-wide suspend. The driver has
260 * to manually suspend all the active unsuspended ports, and
261 * then manually resume them in the bus_resume() routine.
262 */
263 ehci->bus_suspended = 0;
264 ehci->owned_ports = 0;
265 changed = 0;
266 fs_idle_delay = false;
267 port = HCS_N_PORTS(ehci->hcs_params);
268 while (port--) {
269 u32 __iomem *reg = &ehci->regs->port_status [port];
270 u32 t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
271 u32 t2 = t1 & ~PORT_WAKE_BITS;
272
273 /* keep track of which ports we suspend */
274 if (t1 & PORT_OWNER)
275 set_bit(port, &ehci->owned_ports);
276 else if ((t1 & PORT_PE) && !(t1 & PORT_SUSPEND)) {
277 t2 |= PORT_SUSPEND;
278 set_bit(port, &ehci->bus_suspended);
279 }
280
281 /* enable remote wakeup on all ports, if told to do so */
282 if (hcd->self.root_hub->do_remote_wakeup) {
283 /* only enable appropriate wake bits, otherwise the
284 * hardware can not go phy low power mode. If a race
285 * condition happens here(connection change during bits
286 * set), the port change detection will finally fix it.
287 */
288 if (t1 & PORT_CONNECT)
289 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
290 else
291 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
292 }
293
294 if (t1 != t2) {
295 /*
296 * On some controllers, Wake-On-Disconnect will
297 * generate false wakeup signals until the bus
298 * switches over to full-speed idle. For their
299 * sake, add a delay if we need one.
300 */
301 if ((t2 & PORT_WKDISC_E) &&
302 ehci_port_speed(ehci, t2) ==
303 USB_PORT_STAT_HIGH_SPEED)
304 fs_idle_delay = true;
305 ehci_writel(ehci, t2, reg);
306 changed = 1;
307 }
308 }
309 spin_unlock_irq(&ehci->lock);
310
311 if ((changed && ehci->has_tdi_phy_lpm) || fs_idle_delay) {
312 /*
313 * Wait for HCD to enter low-power mode or for the bus
314 * to switch to full-speed idle.
315 */
316 usleep_range(5000, 5500);
317 }
318
319 if (changed && ehci->has_tdi_phy_lpm) {
320 spin_lock_irq(&ehci->lock);
321 port = HCS_N_PORTS(ehci->hcs_params);
322 while (port--) {
323 u32 __iomem *hostpc_reg = &ehci->regs->hostpc[port];
324 u32 t3;
325
326 t3 = ehci_readl(ehci, hostpc_reg);
327 ehci_writel(ehci, t3 | HOSTPC_PHCD, hostpc_reg);
328 t3 = ehci_readl(ehci, hostpc_reg);
329 ehci_dbg(ehci, "Port %d phy low-power mode %s\n",
330 port, (t3 & HOSTPC_PHCD) ?
331 "succeeded" : "failed");
332 }
333 spin_unlock_irq(&ehci->lock);
334 }
335
336 /* Apparently some devices need a >= 1-uframe delay here */
337 if (ehci->bus_suspended)
338 udelay(150);
339
340 /* turn off now-idle HC */
341 ehci_halt (ehci);
342
343 spin_lock_irq(&ehci->lock);
344 if (ehci->enabled_hrtimer_events & BIT(EHCI_HRTIMER_POLL_DEAD))
345 ehci_handle_controller_death(ehci);
346 if (ehci->rh_state != EHCI_RH_RUNNING)
347 goto done;
348 ehci->rh_state = EHCI_RH_SUSPENDED;
349
350 end_unlink_async(ehci);
351 unlink_empty_async_suspended(ehci);
352 ehci_handle_start_intr_unlinks(ehci);
353 ehci_handle_intr_unlinks(ehci);
354 end_free_itds(ehci);
355
356 /* allow remote wakeup */
357 mask = INTR_MASK;
358 if (!hcd->self.root_hub->do_remote_wakeup)
359 mask &= ~STS_PCD;
360 ehci_writel(ehci, mask, &ehci->regs->intr_enable);
361 ehci_readl(ehci, &ehci->regs->intr_enable);
362
363 done:
364 ehci->next_statechange = jiffies + msecs_to_jiffies(10);
365 ehci->enabled_hrtimer_events = 0;
366 ehci->next_hrtimer_event = EHCI_HRTIMER_NO_EVENT;
367 spin_unlock_irq (&ehci->lock);
368
369 hrtimer_cancel(&ehci->hrtimer);
370 return 0;
371 }
372
373
374 /* caller has locked the root hub, and should reset/reinit on error */
375 static int ehci_bus_resume (struct usb_hcd *hcd)
376 {
377 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
378 u32 temp;
379 u32 power_okay;
380 int i;
381 unsigned long resume_needed = 0;
382
383 if (time_before (jiffies, ehci->next_statechange))
384 msleep(5);
385 spin_lock_irq (&ehci->lock);
386 if (!HCD_HW_ACCESSIBLE(hcd) || ehci->shutdown)
387 goto shutdown;
388
389 if (unlikely(ehci->debug)) {
390 if (!dbgp_reset_prep(hcd))
391 ehci->debug = NULL;
392 else
393 dbgp_external_startup(hcd);
394 }
395
396 /* Ideally and we've got a real resume here, and no port's power
397 * was lost. (For PCI, that means Vaux was maintained.) But we
398 * could instead be restoring a swsusp snapshot -- so that BIOS was
399 * the last user of the controller, not reset/pm hardware keeping
400 * state we gave to it.
401 */
402 power_okay = ehci_readl(ehci, &ehci->regs->intr_enable);
403 ehci_dbg(ehci, "resume root hub%s\n",
404 power_okay ? "" : " after power loss");
405
406 /* at least some APM implementations will try to deliver
407 * IRQs right away, so delay them until we're ready.
408 */
409 ehci_writel(ehci, 0, &ehci->regs->intr_enable);
410
411 /* re-init operational registers */
412 ehci_writel(ehci, 0, &ehci->regs->segment);
413 ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
414 ehci_writel(ehci, (u32) ehci->async->qh_dma, &ehci->regs->async_next);
415
416 /* restore CMD_RUN, framelist size, and irq threshold */
417 ehci->command |= CMD_RUN;
418 ehci_writel(ehci, ehci->command, &ehci->regs->command);
419 ehci->rh_state = EHCI_RH_RUNNING;
420
421 /*
422 * According to Bugzilla #8190, the port status for some controllers
423 * will be wrong without a delay. At their wrong status, the port
424 * is enabled, but not suspended neither resumed.
425 */
426 i = HCS_N_PORTS(ehci->hcs_params);
427 while (i--) {
428 temp = ehci_readl(ehci, &ehci->regs->port_status[i]);
429 if ((temp & PORT_PE) &&
430 !(temp & (PORT_SUSPEND | PORT_RESUME))) {
431 ehci_dbg(ehci, "Port status(0x%x) is wrong\n", temp);
432 spin_unlock_irq(&ehci->lock);
433 msleep(8);
434 spin_lock_irq(&ehci->lock);
435 break;
436 }
437 }
438
439 if (ehci->shutdown)
440 goto shutdown;
441
442 /* clear phy low-power mode before resume */
443 if (ehci->bus_suspended && ehci->has_tdi_phy_lpm) {
444 i = HCS_N_PORTS(ehci->hcs_params);
445 while (i--) {
446 if (test_bit(i, &ehci->bus_suspended)) {
447 u32 __iomem *hostpc_reg =
448 &ehci->regs->hostpc[i];
449
450 temp = ehci_readl(ehci, hostpc_reg);
451 ehci_writel(ehci, temp & ~HOSTPC_PHCD,
452 hostpc_reg);
453 }
454 }
455 spin_unlock_irq(&ehci->lock);
456 msleep(5);
457 spin_lock_irq(&ehci->lock);
458 if (ehci->shutdown)
459 goto shutdown;
460 }
461
462 /* manually resume the ports we suspended during bus_suspend() */
463 i = HCS_N_PORTS (ehci->hcs_params);
464 while (i--) {
465 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
466 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
467 if (test_bit(i, &ehci->bus_suspended) &&
468 (temp & PORT_SUSPEND)) {
469 temp |= PORT_RESUME;
470 set_bit(i, &resume_needed);
471 }
472 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
473 }
474
475 /*
476 * msleep for USB_RESUME_TIMEOUT ms only if code is trying to resume
477 * port
478 */
479 if (resume_needed) {
480 spin_unlock_irq(&ehci->lock);
481 msleep(USB_RESUME_TIMEOUT);
482 spin_lock_irq(&ehci->lock);
483 if (ehci->shutdown)
484 goto shutdown;
485 }
486
487 i = HCS_N_PORTS (ehci->hcs_params);
488 while (i--) {
489 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
490 if (test_bit(i, &resume_needed)) {
491 temp &= ~(PORT_RWC_BITS | PORT_SUSPEND | PORT_RESUME);
492 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
493 }
494 }
495
496 ehci->next_statechange = jiffies + msecs_to_jiffies(5);
497 spin_unlock_irq(&ehci->lock);
498
499 ehci_handover_companion_ports(ehci);
500
501 /* Now we can safely re-enable irqs */
502 spin_lock_irq(&ehci->lock);
503 if (ehci->shutdown)
504 goto shutdown;
505 ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
506 (void) ehci_readl(ehci, &ehci->regs->intr_enable);
507 spin_unlock_irq(&ehci->lock);
508
509 return 0;
510
511 shutdown:
512 spin_unlock_irq(&ehci->lock);
513 return -ESHUTDOWN;
514 }
515
516 #else
517
518 #define ehci_bus_suspend NULL
519 #define ehci_bus_resume NULL
520
521 #endif /* CONFIG_PM */
522
523 /*-------------------------------------------------------------------------*/
524
525 /*
526 * Sets the owner of a port
527 */
528 static void set_owner(struct ehci_hcd *ehci, int portnum, int new_owner)
529 {
530 u32 __iomem *status_reg;
531 u32 port_status;
532 int try;
533
534 status_reg = &ehci->regs->port_status[portnum];
535
536 /*
537 * The controller won't set the OWNER bit if the port is
538 * enabled, so this loop will sometimes require at least two
539 * iterations: one to disable the port and one to set OWNER.
540 */
541 for (try = 4; try > 0; --try) {
542 spin_lock_irq(&ehci->lock);
543 port_status = ehci_readl(ehci, status_reg);
544 if ((port_status & PORT_OWNER) == new_owner
545 || (port_status & (PORT_OWNER | PORT_CONNECT))
546 == 0)
547 try = 0;
548 else {
549 port_status ^= PORT_OWNER;
550 port_status &= ~(PORT_PE | PORT_RWC_BITS);
551 ehci_writel(ehci, port_status, status_reg);
552 }
553 spin_unlock_irq(&ehci->lock);
554 if (try > 1)
555 msleep(5);
556 }
557 }
558
559 /*-------------------------------------------------------------------------*/
560
561 static int check_reset_complete (
562 struct ehci_hcd *ehci,
563 int index,
564 u32 __iomem *status_reg,
565 int port_status
566 ) {
567 if (!(port_status & PORT_CONNECT))
568 return port_status;
569
570 /* if reset finished and it's still not enabled -- handoff */
571 if (!(port_status & PORT_PE)) {
572
573 /* with integrated TT, there's nobody to hand it to! */
574 if (ehci_is_TDI(ehci)) {
575 ehci_dbg (ehci,
576 "Failed to enable port %d on root hub TT\n",
577 index+1);
578 return port_status;
579 }
580
581 ehci_dbg (ehci, "port %d full speed --> companion\n",
582 index + 1);
583
584 // what happens if HCS_N_CC(params) == 0 ?
585 port_status |= PORT_OWNER;
586 port_status &= ~PORT_RWC_BITS;
587 ehci_writel(ehci, port_status, status_reg);
588
589 /* ensure 440EPX ohci controller state is operational */
590 if (ehci->has_amcc_usb23)
591 set_ohci_hcfs(ehci, 1);
592 } else {
593 ehci_dbg(ehci, "port %d reset complete, port enabled\n",
594 index + 1);
595 /* ensure 440EPx ohci controller state is suspended */
596 if (ehci->has_amcc_usb23)
597 set_ohci_hcfs(ehci, 0);
598 }
599
600 return port_status;
601 }
602
603 /*-------------------------------------------------------------------------*/
604
605
606 /* build "status change" packet (one or two bytes) from HC registers */
607
608 static int
609 ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
610 {
611 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
612 u32 temp, status;
613 u32 mask;
614 int ports, i, retval = 1;
615 unsigned long flags;
616 u32 ppcd = ~0;
617
618 /* init status to no-changes */
619 buf [0] = 0;
620 ports = HCS_N_PORTS (ehci->hcs_params);
621 if (ports > 7) {
622 buf [1] = 0;
623 retval++;
624 }
625
626 /* Inform the core about resumes-in-progress by returning
627 * a non-zero value even if there are no status changes.
628 */
629 status = ehci->resuming_ports;
630
631 /* Some boards (mostly VIA?) report bogus overcurrent indications,
632 * causing massive log spam unless we completely ignore them. It
633 * may be relevant that VIA VT8235 controllers, where PORT_POWER is
634 * always set, seem to clear PORT_OCC and PORT_CSC when writing to
635 * PORT_POWER; that's surprising, but maybe within-spec.
636 */
637 if (!ignore_oc)
638 mask = PORT_CSC | PORT_PEC | PORT_OCC;
639 else
640 mask = PORT_CSC | PORT_PEC;
641 // PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
642
643 /* no hub change reports (bit 0) for now (power, ...) */
644
645 /* port N changes (bit N)? */
646 spin_lock_irqsave (&ehci->lock, flags);
647
648 /* get per-port change detect bits */
649 if (ehci->has_ppcd)
650 ppcd = ehci_readl(ehci, &ehci->regs->status) >> 16;
651
652 for (i = 0; i < ports; i++) {
653 /* leverage per-port change bits feature */
654 if (ppcd & (1 << i))
655 temp = ehci_readl(ehci, &ehci->regs->port_status[i]);
656 else
657 temp = 0;
658
659 /*
660 * Return status information even for ports with OWNER set.
661 * Otherwise hub_wq wouldn't see the disconnect event when a
662 * high-speed device is switched over to the companion
663 * controller by the user.
664 */
665
666 if ((temp & mask) != 0 || test_bit(i, &ehci->port_c_suspend)
667 || (ehci->reset_done[i] && time_after_eq(
668 jiffies, ehci->reset_done[i]))) {
669 if (i < 7)
670 buf [0] |= 1 << (i + 1);
671 else
672 buf [1] |= 1 << (i - 7);
673 status = STS_PCD;
674 }
675 }
676
677 /* If a resume is in progress, make sure it can finish */
678 if (ehci->resuming_ports)
679 mod_timer(&hcd->rh_timer, jiffies + msecs_to_jiffies(25));
680
681 spin_unlock_irqrestore (&ehci->lock, flags);
682 return status ? retval : 0;
683 }
684
685 /*-------------------------------------------------------------------------*/
686
687 static void
688 ehci_hub_descriptor (
689 struct ehci_hcd *ehci,
690 struct usb_hub_descriptor *desc
691 ) {
692 int ports = HCS_N_PORTS (ehci->hcs_params);
693 u16 temp;
694
695 desc->bDescriptorType = USB_DT_HUB;
696 desc->bPwrOn2PwrGood = 10; /* ehci 1.0, 2.3.9 says 20ms max */
697 desc->bHubContrCurrent = 0;
698
699 desc->bNbrPorts = ports;
700 temp = 1 + (ports / 8);
701 desc->bDescLength = 7 + 2 * temp;
702
703 /* two bitmaps: ports removable, and usb 1.0 legacy PortPwrCtrlMask */
704 memset(&desc->u.hs.DeviceRemovable[0], 0, temp);
705 memset(&desc->u.hs.DeviceRemovable[temp], 0xff, temp);
706
707 temp = HUB_CHAR_INDV_PORT_OCPM; /* per-port overcurrent reporting */
708 if (HCS_PPC (ehci->hcs_params))
709 temp |= HUB_CHAR_INDV_PORT_LPSM; /* per-port power control */
710 else
711 temp |= HUB_CHAR_NO_LPSM; /* no power switching */
712 #if 0
713 // re-enable when we support USB_PORT_FEAT_INDICATOR below.
714 if (HCS_INDICATOR (ehci->hcs_params))
715 temp |= HUB_CHAR_PORTIND; /* per-port indicators (LEDs) */
716 #endif
717 desc->wHubCharacteristics = cpu_to_le16(temp);
718 }
719
720 /*-------------------------------------------------------------------------*/
721 #ifdef CONFIG_USB_HCD_TEST_MODE
722
723 #define EHSET_TEST_SINGLE_STEP_SET_FEATURE 0x06
724
725 static void usb_ehset_completion(struct urb *urb)
726 {
727 struct completion *done = urb->context;
728
729 complete(done);
730 }
731 static int submit_single_step_set_feature(
732 struct usb_hcd *hcd,
733 struct urb *urb,
734 int is_setup
735 );
736
737 /*
738 * Allocate and initialize a control URB. This request will be used by the
739 * EHSET SINGLE_STEP_SET_FEATURE test in which the DATA and STATUS stages
740 * of the GetDescriptor request are sent 15 seconds after the SETUP stage.
741 * Return NULL if failed.
742 */
743 static struct urb *request_single_step_set_feature_urb(
744 struct usb_device *udev,
745 void *dr,
746 void *buf,
747 struct completion *done
748 ) {
749 struct urb *urb;
750 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
751 struct usb_host_endpoint *ep;
752
753 urb = usb_alloc_urb(0, GFP_KERNEL);
754 if (!urb)
755 return NULL;
756
757 urb->pipe = usb_rcvctrlpipe(udev, 0);
758 ep = (usb_pipein(urb->pipe) ? udev->ep_in : udev->ep_out)
759 [usb_pipeendpoint(urb->pipe)];
760 if (!ep) {
761 usb_free_urb(urb);
762 return NULL;
763 }
764
765 urb->ep = ep;
766 urb->dev = udev;
767 urb->setup_packet = (void *)dr;
768 urb->transfer_buffer = buf;
769 urb->transfer_buffer_length = USB_DT_DEVICE_SIZE;
770 urb->complete = usb_ehset_completion;
771 urb->status = -EINPROGRESS;
772 urb->actual_length = 0;
773 urb->transfer_flags = URB_DIR_IN;
774 usb_get_urb(urb);
775 atomic_inc(&urb->use_count);
776 atomic_inc(&urb->dev->urbnum);
777 urb->setup_dma = dma_map_single(
778 hcd->self.controller,
779 urb->setup_packet,
780 sizeof(struct usb_ctrlrequest),
781 DMA_TO_DEVICE);
782 urb->transfer_dma = dma_map_single(
783 hcd->self.controller,
784 urb->transfer_buffer,
785 urb->transfer_buffer_length,
786 DMA_FROM_DEVICE);
787 urb->context = done;
788 return urb;
789 }
790
791 static int ehset_single_step_set_feature(struct usb_hcd *hcd, int port)
792 {
793 int retval = -ENOMEM;
794 struct usb_ctrlrequest *dr;
795 struct urb *urb;
796 struct usb_device *udev;
797 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
798 struct usb_device_descriptor *buf;
799 DECLARE_COMPLETION_ONSTACK(done);
800
801 /* Obtain udev of the rhub's child port */
802 udev = usb_hub_find_child(hcd->self.root_hub, port);
803 if (!udev) {
804 ehci_err(ehci, "No device attached to the RootHub\n");
805 return -ENODEV;
806 }
807 buf = kmalloc(USB_DT_DEVICE_SIZE, GFP_KERNEL);
808 if (!buf)
809 return -ENOMEM;
810
811 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
812 if (!dr) {
813 kfree(buf);
814 return -ENOMEM;
815 }
816
817 /* Fill Setup packet for GetDescriptor */
818 dr->bRequestType = USB_DIR_IN;
819 dr->bRequest = USB_REQ_GET_DESCRIPTOR;
820 dr->wValue = cpu_to_le16(USB_DT_DEVICE << 8);
821 dr->wIndex = 0;
822 dr->wLength = cpu_to_le16(USB_DT_DEVICE_SIZE);
823 urb = request_single_step_set_feature_urb(udev, dr, buf, &done);
824 if (!urb)
825 goto cleanup;
826
827 /* Submit just the SETUP stage */
828 retval = submit_single_step_set_feature(hcd, urb, 1);
829 if (retval)
830 goto out1;
831 if (!wait_for_completion_timeout(&done, msecs_to_jiffies(2000))) {
832 usb_kill_urb(urb);
833 retval = -ETIMEDOUT;
834 ehci_err(ehci, "%s SETUP stage timed out on ep0\n", __func__);
835 goto out1;
836 }
837 msleep(15 * 1000);
838
839 /* Complete remaining DATA and STATUS stages using the same URB */
840 urb->status = -EINPROGRESS;
841 usb_get_urb(urb);
842 atomic_inc(&urb->use_count);
843 atomic_inc(&urb->dev->urbnum);
844 retval = submit_single_step_set_feature(hcd, urb, 0);
845 if (!retval && !wait_for_completion_timeout(&done,
846 msecs_to_jiffies(2000))) {
847 usb_kill_urb(urb);
848 retval = -ETIMEDOUT;
849 ehci_err(ehci, "%s IN stage timed out on ep0\n", __func__);
850 }
851 out1:
852 usb_free_urb(urb);
853 cleanup:
854 kfree(dr);
855 kfree(buf);
856 return retval;
857 }
858 #endif /* CONFIG_USB_HCD_TEST_MODE */
859 /*-------------------------------------------------------------------------*/
860
861 int ehci_hub_control(
862 struct usb_hcd *hcd,
863 u16 typeReq,
864 u16 wValue,
865 u16 wIndex,
866 char *buf,
867 u16 wLength
868 ) {
869 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
870 int ports = HCS_N_PORTS (ehci->hcs_params);
871 u32 __iomem *status_reg = &ehci->regs->port_status[
872 (wIndex & 0xff) - 1];
873 u32 __iomem *hostpc_reg = &ehci->regs->hostpc[(wIndex & 0xff) - 1];
874 u32 temp, temp1, status;
875 unsigned long flags;
876 int retval = 0;
877 unsigned selector;
878
879 /*
880 * FIXME: support SetPortFeatures USB_PORT_FEAT_INDICATOR.
881 * HCS_INDICATOR may say we can change LEDs to off/amber/green.
882 * (track current state ourselves) ... blink for diagnostics,
883 * power, "this is the one", etc. EHCI spec supports this.
884 */
885
886 spin_lock_irqsave (&ehci->lock, flags);
887 switch (typeReq) {
888 case ClearHubFeature:
889 switch (wValue) {
890 case C_HUB_LOCAL_POWER:
891 case C_HUB_OVER_CURRENT:
892 /* no hub-wide feature/status flags */
893 break;
894 default:
895 goto error;
896 }
897 break;
898 case ClearPortFeature:
899 if (!wIndex || wIndex > ports)
900 goto error;
901 wIndex--;
902 temp = ehci_readl(ehci, status_reg);
903 temp &= ~PORT_RWC_BITS;
904
905 /*
906 * Even if OWNER is set, so the port is owned by the
907 * companion controller, hub_wq needs to be able to clear
908 * the port-change status bits (especially
909 * USB_PORT_STAT_C_CONNECTION).
910 */
911
912 switch (wValue) {
913 case USB_PORT_FEAT_ENABLE:
914 ehci_writel(ehci, temp & ~PORT_PE, status_reg);
915 break;
916 case USB_PORT_FEAT_C_ENABLE:
917 ehci_writel(ehci, temp | PORT_PEC, status_reg);
918 break;
919 case USB_PORT_FEAT_SUSPEND:
920 if (temp & PORT_RESET)
921 goto error;
922 if (ehci->no_selective_suspend)
923 break;
924 #ifdef CONFIG_USB_OTG
925 if ((hcd->self.otg_port == (wIndex + 1))
926 && hcd->self.b_hnp_enable) {
927 otg_start_hnp(hcd->usb_phy->otg);
928 break;
929 }
930 #endif
931 if (!(temp & PORT_SUSPEND))
932 break;
933 if ((temp & PORT_PE) == 0)
934 goto error;
935
936 /* clear phy low-power mode before resume */
937 if (ehci->has_tdi_phy_lpm) {
938 temp1 = ehci_readl(ehci, hostpc_reg);
939 ehci_writel(ehci, temp1 & ~HOSTPC_PHCD,
940 hostpc_reg);
941 spin_unlock_irqrestore(&ehci->lock, flags);
942 msleep(5);/* wait to leave low-power mode */
943 spin_lock_irqsave(&ehci->lock, flags);
944 }
945 /* resume signaling for 20 msec */
946 temp &= ~PORT_WAKE_BITS;
947 ehci_writel(ehci, temp | PORT_RESUME, status_reg);
948 ehci->reset_done[wIndex] = jiffies
949 + msecs_to_jiffies(USB_RESUME_TIMEOUT);
950 set_bit(wIndex, &ehci->resuming_ports);
951 usb_hcd_start_port_resume(&hcd->self, wIndex);
952 break;
953 case USB_PORT_FEAT_C_SUSPEND:
954 clear_bit(wIndex, &ehci->port_c_suspend);
955 break;
956 case USB_PORT_FEAT_POWER:
957 if (HCS_PPC(ehci->hcs_params)) {
958 spin_unlock_irqrestore(&ehci->lock, flags);
959 ehci_port_power(ehci, wIndex, false);
960 spin_lock_irqsave(&ehci->lock, flags);
961 }
962 break;
963 case USB_PORT_FEAT_C_CONNECTION:
964 ehci_writel(ehci, temp | PORT_CSC, status_reg);
965 break;
966 case USB_PORT_FEAT_C_OVER_CURRENT:
967 ehci_writel(ehci, temp | PORT_OCC, status_reg);
968 break;
969 case USB_PORT_FEAT_C_RESET:
970 /* GetPortStatus clears reset */
971 break;
972 default:
973 goto error;
974 }
975 ehci_readl(ehci, &ehci->regs->command); /* unblock posted write */
976 break;
977 case GetHubDescriptor:
978 ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
979 buf);
980 break;
981 case GetHubStatus:
982 /* no hub-wide feature/status flags */
983 memset (buf, 0, 4);
984 //cpu_to_le32s ((u32 *) buf);
985 break;
986 case GetPortStatus:
987 if (!wIndex || wIndex > ports)
988 goto error;
989 wIndex--;
990 status = 0;
991 temp = ehci_readl(ehci, status_reg);
992
993 // wPortChange bits
994 if (temp & PORT_CSC)
995 status |= USB_PORT_STAT_C_CONNECTION << 16;
996 if (temp & PORT_PEC)
997 status |= USB_PORT_STAT_C_ENABLE << 16;
998
999 if ((temp & PORT_OCC) && !ignore_oc){
1000 status |= USB_PORT_STAT_C_OVERCURRENT << 16;
1001
1002 /*
1003 * Hubs should disable port power on over-current.
1004 * However, not all EHCI implementations do this
1005 * automatically, even if they _do_ support per-port
1006 * power switching; they're allowed to just limit the
1007 * current. hub_wq will turn the power back on.
1008 */
1009 if (((temp & PORT_OC) || (ehci->need_oc_pp_cycle))
1010 && HCS_PPC(ehci->hcs_params)) {
1011 spin_unlock_irqrestore(&ehci->lock, flags);
1012 ehci_port_power(ehci, wIndex, false);
1013 spin_lock_irqsave(&ehci->lock, flags);
1014 temp = ehci_readl(ehci, status_reg);
1015 }
1016 }
1017
1018 /* no reset or resume pending */
1019 if (!ehci->reset_done[wIndex]) {
1020
1021 /* Remote Wakeup received? */
1022 if (temp & PORT_RESUME) {
1023 /* resume signaling for 20 msec */
1024 ehci->reset_done[wIndex] = jiffies
1025 + msecs_to_jiffies(20);
1026 usb_hcd_start_port_resume(&hcd->self, wIndex);
1027 set_bit(wIndex, &ehci->resuming_ports);
1028 /* check the port again */
1029 mod_timer(&ehci_to_hcd(ehci)->rh_timer,
1030 ehci->reset_done[wIndex]);
1031 }
1032
1033 /* reset or resume not yet complete */
1034 } else if (!time_after_eq(jiffies, ehci->reset_done[wIndex])) {
1035 ; /* wait until it is complete */
1036
1037 /* resume completed */
1038 } else if (test_bit(wIndex, &ehci->resuming_ports)) {
1039 clear_bit(wIndex, &ehci->suspended_ports);
1040 set_bit(wIndex, &ehci->port_c_suspend);
1041 ehci->reset_done[wIndex] = 0;
1042 usb_hcd_end_port_resume(&hcd->self, wIndex);
1043
1044 /* stop resume signaling */
1045 temp &= ~(PORT_RWC_BITS | PORT_SUSPEND | PORT_RESUME);
1046 ehci_writel(ehci, temp, status_reg);
1047 clear_bit(wIndex, &ehci->resuming_ports);
1048 retval = ehci_handshake(ehci, status_reg,
1049 PORT_RESUME, 0, 2000 /* 2msec */);
1050 if (retval != 0) {
1051 ehci_err(ehci, "port %d resume error %d\n",
1052 wIndex + 1, retval);
1053 goto error;
1054 }
1055 temp = ehci_readl(ehci, status_reg);
1056
1057 /* whoever resets must GetPortStatus to complete it!! */
1058 } else {
1059 status |= USB_PORT_STAT_C_RESET << 16;
1060 ehci->reset_done [wIndex] = 0;
1061
1062 /* force reset to complete */
1063 ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESET),
1064 status_reg);
1065 /* REVISIT: some hardware needs 550+ usec to clear
1066 * this bit; seems too long to spin routinely...
1067 */
1068 retval = ehci_handshake(ehci, status_reg,
1069 PORT_RESET, 0, 1000);
1070 if (retval != 0) {
1071 ehci_err (ehci, "port %d reset error %d\n",
1072 wIndex + 1, retval);
1073 goto error;
1074 }
1075
1076 /* see what we found out */
1077 temp = check_reset_complete (ehci, wIndex, status_reg,
1078 ehci_readl(ehci, status_reg));
1079 }
1080
1081 /* transfer dedicated ports to the companion hc */
1082 if ((temp & PORT_CONNECT) &&
1083 test_bit(wIndex, &ehci->companion_ports)) {
1084 temp &= ~PORT_RWC_BITS;
1085 temp |= PORT_OWNER;
1086 ehci_writel(ehci, temp, status_reg);
1087 ehci_dbg(ehci, "port %d --> companion\n", wIndex + 1);
1088 temp = ehci_readl(ehci, status_reg);
1089 }
1090
1091 /*
1092 * Even if OWNER is set, there's no harm letting hub_wq
1093 * see the wPortStatus values (they should all be 0 except
1094 * for PORT_POWER anyway).
1095 */
1096
1097 if (temp & PORT_CONNECT) {
1098 status |= USB_PORT_STAT_CONNECTION;
1099 // status may be from integrated TT
1100 if (ehci->has_hostpc) {
1101 temp1 = ehci_readl(ehci, hostpc_reg);
1102 status |= ehci_port_speed(ehci, temp1);
1103 } else
1104 status |= ehci_port_speed(ehci, temp);
1105 }
1106 if (temp & PORT_PE)
1107 status |= USB_PORT_STAT_ENABLE;
1108
1109 /* maybe the port was unsuspended without our knowledge */
1110 if (temp & (PORT_SUSPEND|PORT_RESUME)) {
1111 status |= USB_PORT_STAT_SUSPEND;
1112 } else if (test_bit(wIndex, &ehci->suspended_ports)) {
1113 clear_bit(wIndex, &ehci->suspended_ports);
1114 clear_bit(wIndex, &ehci->resuming_ports);
1115 ehci->reset_done[wIndex] = 0;
1116 if (temp & PORT_PE)
1117 set_bit(wIndex, &ehci->port_c_suspend);
1118 usb_hcd_end_port_resume(&hcd->self, wIndex);
1119 }
1120
1121 if (temp & PORT_OC)
1122 status |= USB_PORT_STAT_OVERCURRENT;
1123 if (temp & PORT_RESET)
1124 status |= USB_PORT_STAT_RESET;
1125 if (temp & PORT_POWER)
1126 status |= USB_PORT_STAT_POWER;
1127 if (test_bit(wIndex, &ehci->port_c_suspend))
1128 status |= USB_PORT_STAT_C_SUSPEND << 16;
1129
1130 if (status & ~0xffff) /* only if wPortChange is interesting */
1131 dbg_port(ehci, "GetStatus", wIndex + 1, temp);
1132 put_unaligned_le32(status, buf);
1133 break;
1134 case SetHubFeature:
1135 switch (wValue) {
1136 case C_HUB_LOCAL_POWER:
1137 case C_HUB_OVER_CURRENT:
1138 /* no hub-wide feature/status flags */
1139 break;
1140 default:
1141 goto error;
1142 }
1143 break;
1144 case SetPortFeature:
1145 selector = wIndex >> 8;
1146 wIndex &= 0xff;
1147 if (unlikely(ehci->debug)) {
1148 /* If the debug port is active any port
1149 * feature requests should get denied */
1150 if (wIndex == HCS_DEBUG_PORT(ehci->hcs_params) &&
1151 (readl(&ehci->debug->control) & DBGP_ENABLED)) {
1152 retval = -ENODEV;
1153 goto error_exit;
1154 }
1155 }
1156 if (!wIndex || wIndex > ports)
1157 goto error;
1158 wIndex--;
1159 temp = ehci_readl(ehci, status_reg);
1160 if (temp & PORT_OWNER)
1161 break;
1162
1163 temp &= ~PORT_RWC_BITS;
1164 switch (wValue) {
1165 case USB_PORT_FEAT_SUSPEND:
1166 if (ehci->no_selective_suspend)
1167 break;
1168 if ((temp & PORT_PE) == 0
1169 || (temp & PORT_RESET) != 0)
1170 goto error;
1171
1172 /* After above check the port must be connected.
1173 * Set appropriate bit thus could put phy into low power
1174 * mode if we have tdi_phy_lpm feature
1175 */
1176 temp &= ~PORT_WKCONN_E;
1177 temp |= PORT_WKDISC_E | PORT_WKOC_E;
1178 ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
1179 if (ehci->has_tdi_phy_lpm) {
1180 spin_unlock_irqrestore(&ehci->lock, flags);
1181 msleep(5);/* 5ms for HCD enter low pwr mode */
1182 spin_lock_irqsave(&ehci->lock, flags);
1183 temp1 = ehci_readl(ehci, hostpc_reg);
1184 ehci_writel(ehci, temp1 | HOSTPC_PHCD,
1185 hostpc_reg);
1186 temp1 = ehci_readl(ehci, hostpc_reg);
1187 ehci_dbg(ehci, "Port%d phy low pwr mode %s\n",
1188 wIndex, (temp1 & HOSTPC_PHCD) ?
1189 "succeeded" : "failed");
1190 }
1191 set_bit(wIndex, &ehci->suspended_ports);
1192 break;
1193 case USB_PORT_FEAT_POWER:
1194 if (HCS_PPC(ehci->hcs_params)) {
1195 spin_unlock_irqrestore(&ehci->lock, flags);
1196 ehci_port_power(ehci, wIndex, true);
1197 spin_lock_irqsave(&ehci->lock, flags);
1198 }
1199 break;
1200 case USB_PORT_FEAT_RESET:
1201 if (temp & (PORT_SUSPEND|PORT_RESUME))
1202 goto error;
1203 /* line status bits may report this as low speed,
1204 * which can be fine if this root hub has a
1205 * transaction translator built in.
1206 */
1207 if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
1208 && !ehci_is_TDI(ehci)
1209 && PORT_USB11 (temp)) {
1210 ehci_dbg (ehci,
1211 "port %d low speed --> companion\n",
1212 wIndex + 1);
1213 temp |= PORT_OWNER;
1214 } else {
1215 temp |= PORT_RESET;
1216 temp &= ~PORT_PE;
1217
1218 /*
1219 * caller must wait, then call GetPortStatus
1220 * usb 2.0 spec says 50 ms resets on root
1221 */
1222 ehci->reset_done [wIndex] = jiffies
1223 + msecs_to_jiffies (50);
1224
1225 /*
1226 * Force full-speed connect for FSL high-speed
1227 * erratum; disable HS Chirp by setting PFSC bit
1228 */
1229 if (ehci_has_fsl_hs_errata(ehci))
1230 temp |= (1 << PORTSC_FSL_PFSC);
1231 }
1232 ehci_writel(ehci, temp, status_reg);
1233 break;
1234
1235 /* For downstream facing ports (these): one hub port is put
1236 * into test mode according to USB2 11.24.2.13, then the hub
1237 * must be reset (which for root hub now means rmmod+modprobe,
1238 * or else system reboot). See EHCI 2.3.9 and 4.14 for info
1239 * about the EHCI-specific stuff.
1240 */
1241 case USB_PORT_FEAT_TEST:
1242 #ifdef CONFIG_USB_HCD_TEST_MODE
1243 if (selector == EHSET_TEST_SINGLE_STEP_SET_FEATURE) {
1244 spin_unlock_irqrestore(&ehci->lock, flags);
1245 retval = ehset_single_step_set_feature(hcd,
1246 wIndex + 1);
1247 spin_lock_irqsave(&ehci->lock, flags);
1248 break;
1249 }
1250 #endif
1251 if (!selector || selector > 5)
1252 goto error;
1253 spin_unlock_irqrestore(&ehci->lock, flags);
1254 ehci_quiesce(ehci);
1255 spin_lock_irqsave(&ehci->lock, flags);
1256
1257 /* Put all enabled ports into suspend */
1258 while (ports--) {
1259 u32 __iomem *sreg =
1260 &ehci->regs->port_status[ports];
1261
1262 temp = ehci_readl(ehci, sreg) & ~PORT_RWC_BITS;
1263 if (temp & PORT_PE)
1264 ehci_writel(ehci, temp | PORT_SUSPEND,
1265 sreg);
1266 }
1267
1268 spin_unlock_irqrestore(&ehci->lock, flags);
1269 ehci_halt(ehci);
1270 spin_lock_irqsave(&ehci->lock, flags);
1271
1272 temp = ehci_readl(ehci, status_reg);
1273 temp |= selector << 16;
1274 ehci_writel(ehci, temp, status_reg);
1275 break;
1276
1277 default:
1278 goto error;
1279 }
1280 ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
1281 break;
1282
1283 default:
1284 error:
1285 /* "stall" on error */
1286 retval = -EPIPE;
1287 }
1288 error_exit:
1289 spin_unlock_irqrestore (&ehci->lock, flags);
1290 return retval;
1291 }
1292 EXPORT_SYMBOL_GPL(ehci_hub_control);
1293
1294 static void ehci_relinquish_port(struct usb_hcd *hcd, int portnum)
1295 {
1296 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
1297
1298 if (ehci_is_TDI(ehci))
1299 return;
1300 set_owner(ehci, --portnum, PORT_OWNER);
1301 }
1302
1303 static int ehci_port_handed_over(struct usb_hcd *hcd, int portnum)
1304 {
1305 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
1306 u32 __iomem *reg;
1307
1308 if (ehci_is_TDI(ehci))
1309 return 0;
1310 reg = &ehci->regs->port_status[portnum - 1];
1311 return ehci_readl(ehci, reg) & PORT_OWNER;
1312 }
1313
1314 static int ehci_port_power(struct ehci_hcd *ehci, int portnum, bool enable)
1315 {
1316 struct usb_hcd *hcd = ehci_to_hcd(ehci);
1317 u32 __iomem *status_reg = &ehci->regs->port_status[portnum];
1318 u32 temp = ehci_readl(ehci, status_reg) & ~PORT_RWC_BITS;
1319
1320 if (enable)
1321 ehci_writel(ehci, temp | PORT_POWER, status_reg);
1322 else
1323 ehci_writel(ehci, temp & ~PORT_POWER, status_reg);
1324
1325 if (hcd->driver->port_power)
1326 hcd->driver->port_power(hcd, portnum, enable);
1327
1328 return 0;
1329 }
Linux kernel - Deliverables
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