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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux...
[wrt350n-kernel.git] / drivers / usb / host / ehci-hub.c
blob40e8240b7851f012e0e4fe9e71c37ab27d99d67a
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
31 #ifdef CONFIG_USB_PERSIST
32
33 static int ehci_hub_control(
34 struct usb_hcd *hcd,
35 u16 typeReq,
36 u16 wValue,
37 u16 wIndex,
38 char *buf,
39 u16 wLength
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 /* Give the connections some time to appear */
57 msleep(20);
58
59 port = HCS_N_PORTS(ehci->hcs_params);
60 while (port--) {
61 if (test_bit(port, &ehci->owned_ports)) {
62 reg = &ehci->regs->port_status[port];
63 status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
64
65 /* Port already owned by companion? */
66 if (status & PORT_OWNER)
67 clear_bit(port, &ehci->owned_ports);
68 else if (test_bit(port, &ehci->companion_ports))
69 ehci_writel(ehci, status & ~PORT_PE, reg);
70 else
71 ehci_hub_control(hcd, SetPortFeature,
72 USB_PORT_FEAT_RESET, port + 1,
73 NULL, 0);
74 }
75 }
76
77 if (!ehci->owned_ports)
78 return;
79 msleep(90); /* Wait for resets to complete */
80
81 port = HCS_N_PORTS(ehci->hcs_params);
82 while (port--) {
83 if (test_bit(port, &ehci->owned_ports)) {
84 ehci_hub_control(hcd, GetPortStatus,
85 0, port + 1,
86 (char *) &buf, sizeof(buf));
87
88 /* The companion should now own the port,
89 * but if something went wrong the port must not
90 * remain enabled.
91 */
92 reg = &ehci->regs->port_status[port];
93 status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
94 if (status & PORT_OWNER)
95 ehci_writel(ehci, status | PORT_CSC, reg);
96 else {
97 ehci_dbg(ehci, "failed handover port %d: %x\n",
98 port + 1, status);
99 ehci_writel(ehci, status & ~PORT_PE, reg);
100 }
101 }
102 }
103
104 ehci->owned_ports = 0;
105 }
106
107 #else /* CONFIG_USB_PERSIST */
108
109 static inline void ehci_handover_companion_ports(struct ehci_hcd *ehci)
110 { }
111
112 #endif
113
114 #ifdef CONFIG_PM
115
116 static int ehci_bus_suspend (struct usb_hcd *hcd)
117 {
118 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
119 int port;
120 int mask;
121
122 ehci_dbg(ehci, "suspend root hub\n");
123
124 if (time_before (jiffies, ehci->next_statechange))
125 msleep(5);
126 del_timer_sync(&ehci->watchdog);
127 del_timer_sync(&ehci->iaa_watchdog);
128
129 port = HCS_N_PORTS (ehci->hcs_params);
130 spin_lock_irq (&ehci->lock);
131
132 /* stop schedules, clean any completed work */
133 if (HC_IS_RUNNING(hcd->state)) {
134 ehci_quiesce (ehci);
135 hcd->state = HC_STATE_QUIESCING;
136 }
137 ehci->command = ehci_readl(ehci, &ehci->regs->command);
138 if (ehci->reclaim)
139 end_unlink_async(ehci);
140 ehci_work(ehci);
141
142 /* Unlike other USB host controller types, EHCI doesn't have
143 * any notion of "global" or bus-wide suspend. The driver has
144 * to manually suspend all the active unsuspended ports, and
145 * then manually resume them in the bus_resume() routine.
146 */
147 ehci->bus_suspended = 0;
148 ehci->owned_ports = 0;
149 while (port--) {
150 u32 __iomem *reg = &ehci->regs->port_status [port];
151 u32 t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
152 u32 t2 = t1;
153
154 /* keep track of which ports we suspend */
155 if (t1 & PORT_OWNER)
156 set_bit(port, &ehci->owned_ports);
157 else if ((t1 & PORT_PE) && !(t1 & PORT_SUSPEND)) {
158 t2 |= PORT_SUSPEND;
159 set_bit(port, &ehci->bus_suspended);
160 }
161
162 /* enable remote wakeup on all ports */
163 if (device_may_wakeup(&hcd->self.root_hub->dev))
164 t2 |= PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E;
165 else
166 t2 &= ~(PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E);
167
168 if (t1 != t2) {
169 ehci_vdbg (ehci, "port %d, %08x -> %08x\n",
170 port + 1, t1, t2);
171 ehci_writel(ehci, t2, reg);
172 }
173 }
174
175 /* Apparently some devices need a >= 1-uframe delay here */
176 if (ehci->bus_suspended)
177 udelay(150);
178
179 /* turn off now-idle HC */
180 ehci_halt (ehci);
181 hcd->state = HC_STATE_SUSPENDED;
182
183 /* allow remote wakeup */
184 mask = INTR_MASK;
185 if (!device_may_wakeup(&hcd->self.root_hub->dev))
186 mask &= ~STS_PCD;
187 ehci_writel(ehci, mask, &ehci->regs->intr_enable);
188 ehci_readl(ehci, &ehci->regs->intr_enable);
189
190 ehci->next_statechange = jiffies + msecs_to_jiffies(10);
191 spin_unlock_irq (&ehci->lock);
192 return 0;
193 }
194
195
196 /* caller has locked the root hub, and should reset/reinit on error */
197 static int ehci_bus_resume (struct usb_hcd *hcd)
198 {
199 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
200 u32 temp;
201 u32 power_okay;
202 int i;
203
204 if (time_before (jiffies, ehci->next_statechange))
205 msleep(5);
206 spin_lock_irq (&ehci->lock);
207 if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
208 spin_unlock_irq(&ehci->lock);
209 return -ESHUTDOWN;
210 }
211
212 /* Ideally and we've got a real resume here, and no port's power
213 * was lost. (For PCI, that means Vaux was maintained.) But we
214 * could instead be restoring a swsusp snapshot -- so that BIOS was
215 * the last user of the controller, not reset/pm hardware keeping
216 * state we gave to it.
217 */
218 power_okay = ehci_readl(ehci, &ehci->regs->intr_enable);
219 ehci_dbg(ehci, "resume root hub%s\n",
220 power_okay ? "" : " after power loss");
221
222 /* at least some APM implementations will try to deliver
223 * IRQs right away, so delay them until we're ready.
224 */
225 ehci_writel(ehci, 0, &ehci->regs->intr_enable);
226
227 /* re-init operational registers */
228 ehci_writel(ehci, 0, &ehci->regs->segment);
229 ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
230 ehci_writel(ehci, (u32) ehci->async->qh_dma, &ehci->regs->async_next);
231
232 /* restore CMD_RUN, framelist size, and irq threshold */
233 ehci_writel(ehci, ehci->command, &ehci->regs->command);
234
235 /* Some controller/firmware combinations need a delay during which
236 * they set up the port statuses. See Bugzilla #8190. */
237 mdelay(8);
238
239 /* manually resume the ports we suspended during bus_suspend() */
240 i = HCS_N_PORTS (ehci->hcs_params);
241 while (i--) {
242 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
243 temp &= ~(PORT_RWC_BITS
244 | PORT_WKOC_E | PORT_WKDISC_E | PORT_WKCONN_E);
245 if (test_bit(i, &ehci->bus_suspended) &&
246 (temp & PORT_SUSPEND)) {
247 ehci->reset_done [i] = jiffies + msecs_to_jiffies (20);
248 temp |= PORT_RESUME;
249 }
250 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
251 }
252 i = HCS_N_PORTS (ehci->hcs_params);
253 mdelay (20);
254 while (i--) {
255 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
256 if (test_bit(i, &ehci->bus_suspended) &&
257 (temp & PORT_SUSPEND)) {
258 temp &= ~(PORT_RWC_BITS | PORT_RESUME);
259 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
260 ehci_vdbg (ehci, "resumed port %d\n", i + 1);
261 }
262 }
263 (void) ehci_readl(ehci, &ehci->regs->command);
264
265 /* maybe re-activate the schedule(s) */
266 temp = 0;
267 if (ehci->async->qh_next.qh)
268 temp |= CMD_ASE;
269 if (ehci->periodic_sched)
270 temp |= CMD_PSE;
271 if (temp) {
272 ehci->command |= temp;
273 ehci_writel(ehci, ehci->command, &ehci->regs->command);
274 }
275
276 ehci->next_statechange = jiffies + msecs_to_jiffies(5);
277 hcd->state = HC_STATE_RUNNING;
278
279 /* Now we can safely re-enable irqs */
280 ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
281
282 spin_unlock_irq (&ehci->lock);
283
284 if (!power_okay)
285 ehci_handover_companion_ports(ehci);
286 return 0;
287 }
288
289 #else
290
291 #define ehci_bus_suspend NULL
292 #define ehci_bus_resume NULL
293
294 #endif /* CONFIG_PM */
295
296 /*-------------------------------------------------------------------------*/
297
298 /* Display the ports dedicated to the companion controller */
299 static ssize_t show_companion(struct device *dev,
300 struct device_attribute *attr,
301 char *buf)
302 {
303 struct ehci_hcd *ehci;
304 int nports, index, n;
305 int count = PAGE_SIZE;
306 char *ptr = buf;
307
308 ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
309 nports = HCS_N_PORTS(ehci->hcs_params);
310
311 for (index = 0; index < nports; ++index) {
312 if (test_bit(index, &ehci->companion_ports)) {
313 n = scnprintf(ptr, count, "%d\n", index + 1);
314 ptr += n;
315 count -= n;
316 }
317 }
318 return ptr - buf;
319 }
320
321 /*
322 * Sets the owner of a port
323 */
324 static void set_owner(struct ehci_hcd *ehci, int portnum, int new_owner)
325 {
326 u32 __iomem *status_reg;
327 u32 port_status;
328 int try;
329
330 status_reg = &ehci->regs->port_status[portnum];
331
332 /*
333 * The controller won't set the OWNER bit if the port is
334 * enabled, so this loop will sometimes require at least two
335 * iterations: one to disable the port and one to set OWNER.
336 */
337 for (try = 4; try > 0; --try) {
338 spin_lock_irq(&ehci->lock);
339 port_status = ehci_readl(ehci, status_reg);
340 if ((port_status & PORT_OWNER) == new_owner
341 || (port_status & (PORT_OWNER | PORT_CONNECT))
342 == 0)
343 try = 0;
344 else {
345 port_status ^= PORT_OWNER;
346 port_status &= ~(PORT_PE | PORT_RWC_BITS);
347 ehci_writel(ehci, port_status, status_reg);
348 }
349 spin_unlock_irq(&ehci->lock);
350 if (try > 1)
351 msleep(5);
352 }
353 }
354
355 /*
356 * Dedicate or undedicate a port to the companion controller.
357 * Syntax is "[-]portnum", where a leading '-' sign means
358 * return control of the port to the EHCI controller.
359 */
360 static ssize_t store_companion(struct device *dev,
361 struct device_attribute *attr,
362 const char *buf, size_t count)
363 {
364 struct ehci_hcd *ehci;
365 int portnum, new_owner;
366
367 ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
368 new_owner = PORT_OWNER; /* Owned by companion */
369 if (sscanf(buf, "%d", &portnum) != 1)
370 return -EINVAL;
371 if (portnum < 0) {
372 portnum = - portnum;
373 new_owner = 0; /* Owned by EHCI */
374 }
375 if (portnum <= 0 || portnum > HCS_N_PORTS(ehci->hcs_params))
376 return -ENOENT;
377 portnum--;
378 if (new_owner)
379 set_bit(portnum, &ehci->companion_ports);
380 else
381 clear_bit(portnum, &ehci->companion_ports);
382 set_owner(ehci, portnum, new_owner);
383 return count;
384 }
385 static DEVICE_ATTR(companion, 0644, show_companion, store_companion);
386
387 static inline void create_companion_file(struct ehci_hcd *ehci)
388 {
389 int i;
390
391 /* with integrated TT there is no companion! */
392 if (!ehci_is_TDI(ehci))
393 i = device_create_file(ehci_to_hcd(ehci)->self.dev,
394 &dev_attr_companion);
395 }
396
397 static inline void remove_companion_file(struct ehci_hcd *ehci)
398 {
399 /* with integrated TT there is no companion! */
400 if (!ehci_is_TDI(ehci))
401 device_remove_file(ehci_to_hcd(ehci)->self.dev,
402 &dev_attr_companion);
403 }
404
405
406 /*-------------------------------------------------------------------------*/
407
408 static int check_reset_complete (
409 struct ehci_hcd *ehci,
410 int index,
411 u32 __iomem *status_reg,
412 int port_status
413 ) {
414 if (!(port_status & PORT_CONNECT))
415 return port_status;
416
417 /* if reset finished and it's still not enabled -- handoff */
418 if (!(port_status & PORT_PE)) {
419
420 /* with integrated TT, there's nobody to hand it to! */
421 if (ehci_is_TDI(ehci)) {
422 ehci_dbg (ehci,
423 "Failed to enable port %d on root hub TT\n",
424 index+1);
425 return port_status;
426 }
427
428 ehci_dbg (ehci, "port %d full speed --> companion\n",
429 index + 1);
430
431 // what happens if HCS_N_CC(params) == 0 ?
432 port_status |= PORT_OWNER;
433 port_status &= ~PORT_RWC_BITS;
434 ehci_writel(ehci, port_status, status_reg);
435
436 } else
437 ehci_dbg (ehci, "port %d high speed\n", index + 1);
438
439 return port_status;
440 }
441
442 /*-------------------------------------------------------------------------*/
443
444
445 /* build "status change" packet (one or two bytes) from HC registers */
446
447 static int
448 ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
449 {
450 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
451 u32 temp, status = 0;
452 u32 mask;
453 int ports, i, retval = 1;
454 unsigned long flags;
455
456 /* if !USB_SUSPEND, root hub timers won't get shut down ... */
457 if (!HC_IS_RUNNING(hcd->state))
458 return 0;
459
460 /* init status to no-changes */
461 buf [0] = 0;
462 ports = HCS_N_PORTS (ehci->hcs_params);
463 if (ports > 7) {
464 buf [1] = 0;
465 retval++;
466 }
467
468 /* Some boards (mostly VIA?) report bogus overcurrent indications,
469 * causing massive log spam unless we completely ignore them. It
470 * may be relevant that VIA VT8235 controllers, where PORT_POWER is
471 * always set, seem to clear PORT_OCC and PORT_CSC when writing to
472 * PORT_POWER; that's surprising, but maybe within-spec.
473 */
474 if (!ignore_oc)
475 mask = PORT_CSC | PORT_PEC | PORT_OCC;
476 else
477 mask = PORT_CSC | PORT_PEC;
478 // PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
479
480 /* no hub change reports (bit 0) for now (power, ...) */
481
482 /* port N changes (bit N)? */
483 spin_lock_irqsave (&ehci->lock, flags);
484 for (i = 0; i < ports; i++) {
485 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
486
487 /*
488 * Return status information even for ports with OWNER set.
489 * Otherwise khubd wouldn't see the disconnect event when a
490 * high-speed device is switched over to the companion
491 * controller by the user.
492 */
493
494 if ((temp & mask) != 0
495 || ((temp & PORT_RESUME) != 0
496 && time_after_eq(jiffies,
497 ehci->reset_done[i]))) {
498 if (i < 7)
499 buf [0] |= 1 << (i + 1);
500 else
501 buf [1] |= 1 << (i - 7);
502 status = STS_PCD;
503 }
504 }
505 /* FIXME autosuspend idle root hubs */
506 spin_unlock_irqrestore (&ehci->lock, flags);
507 return status ? retval : 0;
508 }
509
510 /*-------------------------------------------------------------------------*/
511
512 static void
513 ehci_hub_descriptor (
514 struct ehci_hcd *ehci,
515 struct usb_hub_descriptor *desc
516 ) {
517 int ports = HCS_N_PORTS (ehci->hcs_params);
518 u16 temp;
519
520 desc->bDescriptorType = 0x29;
521 desc->bPwrOn2PwrGood = 10; /* ehci 1.0, 2.3.9 says 20ms max */
522 desc->bHubContrCurrent = 0;
523
524 desc->bNbrPorts = ports;
525 temp = 1 + (ports / 8);
526 desc->bDescLength = 7 + 2 * temp;
527
528 /* two bitmaps: ports removable, and usb 1.0 legacy PortPwrCtrlMask */
529 memset (&desc->bitmap [0], 0, temp);
530 memset (&desc->bitmap [temp], 0xff, temp);
531
532 temp = 0x0008; /* per-port overcurrent reporting */
533 if (HCS_PPC (ehci->hcs_params))
534 temp |= 0x0001; /* per-port power control */
535 else
536 temp |= 0x0002; /* no power switching */
537 #if 0
538 // re-enable when we support USB_PORT_FEAT_INDICATOR below.
539 if (HCS_INDICATOR (ehci->hcs_params))
540 temp |= 0x0080; /* per-port indicators (LEDs) */
541 #endif
542 desc->wHubCharacteristics = (__force __u16)cpu_to_le16 (temp);
543 }
544
545 /*-------------------------------------------------------------------------*/
546
547 #define PORT_WAKE_BITS (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
548
549 static int ehci_hub_control (
550 struct usb_hcd *hcd,
551 u16 typeReq,
552 u16 wValue,
553 u16 wIndex,
554 char *buf,
555 u16 wLength
556 ) {
557 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
558 int ports = HCS_N_PORTS (ehci->hcs_params);
559 u32 __iomem *status_reg = &ehci->regs->port_status[
560 (wIndex & 0xff) - 1];
561 u32 temp, status;
562 unsigned long flags;
563 int retval = 0;
564 unsigned selector;
565
566 /*
567 * FIXME: support SetPortFeatures USB_PORT_FEAT_INDICATOR.
568 * HCS_INDICATOR may say we can change LEDs to off/amber/green.
569 * (track current state ourselves) ... blink for diagnostics,
570 * power, "this is the one", etc. EHCI spec supports this.
571 */
572
573 spin_lock_irqsave (&ehci->lock, flags);
574 switch (typeReq) {
575 case ClearHubFeature:
576 switch (wValue) {
577 case C_HUB_LOCAL_POWER:
578 case C_HUB_OVER_CURRENT:
579 /* no hub-wide feature/status flags */
580 break;
581 default:
582 goto error;
583 }
584 break;
585 case ClearPortFeature:
586 if (!wIndex || wIndex > ports)
587 goto error;
588 wIndex--;
589 temp = ehci_readl(ehci, status_reg);
590
591 /*
592 * Even if OWNER is set, so the port is owned by the
593 * companion controller, khubd needs to be able to clear
594 * the port-change status bits (especially
595 * USB_PORT_FEAT_C_CONNECTION).
596 */
597
598 switch (wValue) {
599 case USB_PORT_FEAT_ENABLE:
600 ehci_writel(ehci, temp & ~PORT_PE, status_reg);
601 break;
602 case USB_PORT_FEAT_C_ENABLE:
603 ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_PEC,
604 status_reg);
605 break;
606 case USB_PORT_FEAT_SUSPEND:
607 if (temp & PORT_RESET)
608 goto error;
609 if (ehci->no_selective_suspend)
610 break;
611 if (temp & PORT_SUSPEND) {
612 if ((temp & PORT_PE) == 0)
613 goto error;
614 /* resume signaling for 20 msec */
615 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
616 ehci_writel(ehci, temp | PORT_RESUME,
617 status_reg);
618 ehci->reset_done [wIndex] = jiffies
619 + msecs_to_jiffies (20);
620 }
621 break;
622 case USB_PORT_FEAT_C_SUSPEND:
623 /* we auto-clear this feature */
624 break;
625 case USB_PORT_FEAT_POWER:
626 if (HCS_PPC (ehci->hcs_params))
627 ehci_writel(ehci,
628 temp & ~(PORT_RWC_BITS | PORT_POWER),
629 status_reg);
630 break;
631 case USB_PORT_FEAT_C_CONNECTION:
632 ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_CSC,
633 status_reg);
634 break;
635 case USB_PORT_FEAT_C_OVER_CURRENT:
636 ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_OCC,
637 status_reg);
638 break;
639 case USB_PORT_FEAT_C_RESET:
640 /* GetPortStatus clears reset */
641 break;
642 default:
643 goto error;
644 }
645 ehci_readl(ehci, &ehci->regs->command); /* unblock posted write */
646 break;
647 case GetHubDescriptor:
648 ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
649 buf);
650 break;
651 case GetHubStatus:
652 /* no hub-wide feature/status flags */
653 memset (buf, 0, 4);
654 //cpu_to_le32s ((u32 *) buf);
655 break;
656 case GetPortStatus:
657 if (!wIndex || wIndex > ports)
658 goto error;
659 wIndex--;
660 status = 0;
661 temp = ehci_readl(ehci, status_reg);
662
663 // wPortChange bits
664 if (temp & PORT_CSC)
665 status |= 1 << USB_PORT_FEAT_C_CONNECTION;
666 if (temp & PORT_PEC)
667 status |= 1 << USB_PORT_FEAT_C_ENABLE;
668
669 if ((temp & PORT_OCC) && !ignore_oc){
670 status |= 1 << USB_PORT_FEAT_C_OVER_CURRENT;
671
672 /*
673 * Hubs should disable port power on over-current.
674 * However, not all EHCI implementations do this
675 * automatically, even if they _do_ support per-port
676 * power switching; they're allowed to just limit the
677 * current. khubd will turn the power back on.
678 */
679 if (HCS_PPC (ehci->hcs_params)){
680 ehci_writel(ehci,
681 temp & ~(PORT_RWC_BITS | PORT_POWER),
682 status_reg);
683 }
684 }
685
686 /* whoever resumes must GetPortStatus to complete it!! */
687 if (temp & PORT_RESUME) {
688
689 /* Remote Wakeup received? */
690 if (!ehci->reset_done[wIndex]) {
691 /* resume signaling for 20 msec */
692 ehci->reset_done[wIndex] = jiffies
693 + msecs_to_jiffies(20);
694 /* check the port again */
695 mod_timer(&ehci_to_hcd(ehci)->rh_timer,
696 ehci->reset_done[wIndex]);
697 }
698
699 /* resume completed? */
700 else if (time_after_eq(jiffies,
701 ehci->reset_done[wIndex])) {
702 status |= 1 << USB_PORT_FEAT_C_SUSPEND;
703 ehci->reset_done[wIndex] = 0;
704
705 /* stop resume signaling */
706 temp = ehci_readl(ehci, status_reg);
707 ehci_writel(ehci,
708 temp & ~(PORT_RWC_BITS | PORT_RESUME),
709 status_reg);
710 retval = handshake(ehci, status_reg,
711 PORT_RESUME, 0, 2000 /* 2msec */);
712 if (retval != 0) {
713 ehci_err(ehci,
714 "port %d resume error %d\n",
715 wIndex + 1, retval);
716 goto error;
717 }
718 temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10));
719 }
720 }
721
722 /* whoever resets must GetPortStatus to complete it!! */
723 if ((temp & PORT_RESET)
724 && time_after_eq(jiffies,
725 ehci->reset_done[wIndex])) {
726 status |= 1 << USB_PORT_FEAT_C_RESET;
727 ehci->reset_done [wIndex] = 0;
728
729 /* force reset to complete */
730 ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESET),
731 status_reg);
732 /* REVISIT: some hardware needs 550+ usec to clear
733 * this bit; seems too long to spin routinely...
734 */
735 retval = handshake(ehci, status_reg,
736 PORT_RESET, 0, 750);
737 if (retval != 0) {
738 ehci_err (ehci, "port %d reset error %d\n",
739 wIndex + 1, retval);
740 goto error;
741 }
742
743 /* see what we found out */
744 temp = check_reset_complete (ehci, wIndex, status_reg,
745 ehci_readl(ehci, status_reg));
746 }
747
748 /* transfer dedicated ports to the companion hc */
749 if ((temp & PORT_CONNECT) &&
750 test_bit(wIndex, &ehci->companion_ports)) {
751 temp &= ~PORT_RWC_BITS;
752 temp |= PORT_OWNER;
753 ehci_writel(ehci, temp, status_reg);
754 ehci_dbg(ehci, "port %d --> companion\n", wIndex + 1);
755 temp = ehci_readl(ehci, status_reg);
756 }
757
758 /*
759 * Even if OWNER is set, there's no harm letting khubd
760 * see the wPortStatus values (they should all be 0 except
761 * for PORT_POWER anyway).
762 */
763
764 if (temp & PORT_CONNECT) {
765 status |= 1 << USB_PORT_FEAT_CONNECTION;
766 // status may be from integrated TT
767 status |= ehci_port_speed(ehci, temp);
768 }
769 if (temp & PORT_PE)
770 status |= 1 << USB_PORT_FEAT_ENABLE;
771 if (temp & (PORT_SUSPEND|PORT_RESUME))
772 status |= 1 << USB_PORT_FEAT_SUSPEND;
773 if (temp & PORT_OC)
774 status |= 1 << USB_PORT_FEAT_OVER_CURRENT;
775 if (temp & PORT_RESET)
776 status |= 1 << USB_PORT_FEAT_RESET;
777 if (temp & PORT_POWER)
778 status |= 1 << USB_PORT_FEAT_POWER;
779
780 #ifndef EHCI_VERBOSE_DEBUG
781 if (status & ~0xffff) /* only if wPortChange is interesting */
782 #endif
783 dbg_port (ehci, "GetStatus", wIndex + 1, temp);
784 put_unaligned(cpu_to_le32 (status), (__le32 *) buf);
785 break;
786 case SetHubFeature:
787 switch (wValue) {
788 case C_HUB_LOCAL_POWER:
789 case C_HUB_OVER_CURRENT:
790 /* no hub-wide feature/status flags */
791 break;
792 default:
793 goto error;
794 }
795 break;
796 case SetPortFeature:
797 selector = wIndex >> 8;
798 wIndex &= 0xff;
799 if (!wIndex || wIndex > ports)
800 goto error;
801 wIndex--;
802 temp = ehci_readl(ehci, status_reg);
803 if (temp & PORT_OWNER)
804 break;
805
806 temp &= ~PORT_RWC_BITS;
807 switch (wValue) {
808 case USB_PORT_FEAT_SUSPEND:
809 if (ehci->no_selective_suspend)
810 break;
811 if ((temp & PORT_PE) == 0
812 || (temp & PORT_RESET) != 0)
813 goto error;
814 if (device_may_wakeup(&hcd->self.root_hub->dev))
815 temp |= PORT_WAKE_BITS;
816 ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
817 break;
818 case USB_PORT_FEAT_POWER:
819 if (HCS_PPC (ehci->hcs_params))
820 ehci_writel(ehci, temp | PORT_POWER,
821 status_reg);
822 break;
823 case USB_PORT_FEAT_RESET:
824 if (temp & PORT_RESUME)
825 goto error;
826 /* line status bits may report this as low speed,
827 * which can be fine if this root hub has a
828 * transaction translator built in.
829 */
830 if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
831 && !ehci_is_TDI(ehci)
832 && PORT_USB11 (temp)) {
833 ehci_dbg (ehci,
834 "port %d low speed --> companion\n",
835 wIndex + 1);
836 temp |= PORT_OWNER;
837 } else {
838 ehci_vdbg (ehci, "port %d reset\n", wIndex + 1);
839 temp |= PORT_RESET;
840 temp &= ~PORT_PE;
841
842 /*
843 * caller must wait, then call GetPortStatus
844 * usb 2.0 spec says 50 ms resets on root
845 */
846 ehci->reset_done [wIndex] = jiffies
847 + msecs_to_jiffies (50);
848 }
849 ehci_writel(ehci, temp, status_reg);
850 break;
851
852 /* For downstream facing ports (these): one hub port is put
853 * into test mode according to USB2 11.24.2.13, then the hub
854 * must be reset (which for root hub now means rmmod+modprobe,
855 * or else system reboot). See EHCI 2.3.9 and 4.14 for info
856 * about the EHCI-specific stuff.
857 */
858 case USB_PORT_FEAT_TEST:
859 if (!selector || selector > 5)
860 goto error;
861 ehci_quiesce(ehci);
862 ehci_halt(ehci);
863 temp |= selector << 16;
864 ehci_writel(ehci, temp, status_reg);
865 break;
866
867 default:
868 goto error;
869 }
870 ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
871 break;
872
873 default:
874 error:
875 /* "stall" on error */
876 retval = -EPIPE;
877 }
878 spin_unlock_irqrestore (&ehci->lock, flags);
879 return retval;
880 }
881
882 static void ehci_relinquish_port(struct usb_hcd *hcd, int portnum)
883 {
884 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
885
886 if (ehci_is_TDI(ehci))
887 return;
888 set_owner(ehci, --portnum, PORT_OWNER);
889 }
890
WRT350N Kernel Patches