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cciss: fix problem that deleting multiple logical drives could cause a panic
[linux-2.6/libata-dev.git] / drivers / usb / host / ehci-hub.c
blob218f9660d7ee06426e68130d0859d74428788e40
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 #define PORT_WAKE_BITS (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
32
33 #ifdef CONFIG_PM
34
35 static int ehci_hub_control(
36 struct usb_hcd *hcd,
37 u16 typeReq,
38 u16 wValue,
39 u16 wIndex,
40 char *buf,
41 u16 wLength
42 );
43
44 /* After a power loss, ports that were owned by the companion must be
45 * reset so that the companion can still own them.
46 */
47 static void ehci_handover_companion_ports(struct ehci_hcd *ehci)
48 {
49 u32 __iomem *reg;
50 u32 status;
51 int port;
52 __le32 buf;
53 struct usb_hcd *hcd = ehci_to_hcd(ehci);
54
55 if (!ehci->owned_ports)
56 return;
57
58 /* Give the connections some time to appear */
59 msleep(20);
60
61 port = HCS_N_PORTS(ehci->hcs_params);
62 while (port--) {
63 if (test_bit(port, &ehci->owned_ports)) {
64 reg = &ehci->regs->port_status[port];
65 status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
66
67 /* Port already owned by companion? */
68 if (status & PORT_OWNER)
69 clear_bit(port, &ehci->owned_ports);
70 else if (test_bit(port, &ehci->companion_ports))
71 ehci_writel(ehci, status & ~PORT_PE, reg);
72 else
73 ehci_hub_control(hcd, SetPortFeature,
74 USB_PORT_FEAT_RESET, port + 1,
75 NULL, 0);
76 }
77 }
78
79 if (!ehci->owned_ports)
80 return;
81 msleep(90); /* Wait for resets to complete */
82
83 port = HCS_N_PORTS(ehci->hcs_params);
84 while (port--) {
85 if (test_bit(port, &ehci->owned_ports)) {
86 ehci_hub_control(hcd, GetPortStatus,
87 0, port + 1,
88 (char *) &buf, sizeof(buf));
89
90 /* The companion should now own the port,
91 * but if something went wrong the port must not
92 * remain enabled.
93 */
94 reg = &ehci->regs->port_status[port];
95 status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
96 if (status & PORT_OWNER)
97 ehci_writel(ehci, status | PORT_CSC, reg);
98 else {
99 ehci_dbg(ehci, "failed handover port %d: %x\n",
100 port + 1, status);
101 ehci_writel(ehci, status & ~PORT_PE, reg);
102 }
103 }
104 }
105
106 ehci->owned_ports = 0;
107 }
108
109 static int ehci_bus_suspend (struct usb_hcd *hcd)
110 {
111 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
112 int port;
113 int mask;
114
115 ehci_dbg(ehci, "suspend root hub\n");
116
117 if (time_before (jiffies, ehci->next_statechange))
118 msleep(5);
119 del_timer_sync(&ehci->watchdog);
120 del_timer_sync(&ehci->iaa_watchdog);
121
122 port = HCS_N_PORTS (ehci->hcs_params);
123 spin_lock_irq (&ehci->lock);
124
125 /* stop schedules, clean any completed work */
126 if (HC_IS_RUNNING(hcd->state)) {
127 ehci_quiesce (ehci);
128 hcd->state = HC_STATE_QUIESCING;
129 }
130 ehci->command = ehci_readl(ehci, &ehci->regs->command);
131 ehci_work(ehci);
132
133 /* Unlike other USB host controller types, EHCI doesn't have
134 * any notion of "global" or bus-wide suspend. The driver has
135 * to manually suspend all the active unsuspended ports, and
136 * then manually resume them in the bus_resume() routine.
137 */
138 ehci->bus_suspended = 0;
139 ehci->owned_ports = 0;
140 while (port--) {
141 u32 __iomem *reg = &ehci->regs->port_status [port];
142 u32 t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
143 u32 t2 = t1;
144
145 /* keep track of which ports we suspend */
146 if (t1 & PORT_OWNER)
147 set_bit(port, &ehci->owned_ports);
148 else if ((t1 & PORT_PE) && !(t1 & PORT_SUSPEND)) {
149 t2 |= PORT_SUSPEND;
150 set_bit(port, &ehci->bus_suspended);
151 }
152
153 /* enable remote wakeup on all ports */
154 if (hcd->self.root_hub->do_remote_wakeup)
155 t2 |= PORT_WAKE_BITS;
156 else
157 t2 &= ~PORT_WAKE_BITS;
158
159 if (t1 != t2) {
160 ehci_vdbg (ehci, "port %d, %08x -> %08x\n",
161 port + 1, t1, t2);
162 ehci_writel(ehci, t2, reg);
163 }
164 }
165
166 /* Apparently some devices need a >= 1-uframe delay here */
167 if (ehci->bus_suspended)
168 udelay(150);
169
170 /* turn off now-idle HC */
171 ehci_halt (ehci);
172 hcd->state = HC_STATE_SUSPENDED;
173
174 if (ehci->reclaim)
175 end_unlink_async(ehci);
176
177 /* allow remote wakeup */
178 mask = INTR_MASK;
179 if (!hcd->self.root_hub->do_remote_wakeup)
180 mask &= ~STS_PCD;
181 ehci_writel(ehci, mask, &ehci->regs->intr_enable);
182 ehci_readl(ehci, &ehci->regs->intr_enable);
183
184 ehci->next_statechange = jiffies + msecs_to_jiffies(10);
185 spin_unlock_irq (&ehci->lock);
186 return 0;
187 }
188
189
190 /* caller has locked the root hub, and should reset/reinit on error */
191 static int ehci_bus_resume (struct usb_hcd *hcd)
192 {
193 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
194 u32 temp;
195 u32 power_okay;
196 int i;
197
198 if (time_before (jiffies, ehci->next_statechange))
199 msleep(5);
200 spin_lock_irq (&ehci->lock);
201 if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
202 spin_unlock_irq(&ehci->lock);
203 return -ESHUTDOWN;
204 }
205
206 /* Ideally and we've got a real resume here, and no port's power
207 * was lost. (For PCI, that means Vaux was maintained.) But we
208 * could instead be restoring a swsusp snapshot -- so that BIOS was
209 * the last user of the controller, not reset/pm hardware keeping
210 * state we gave to it.
211 */
212 power_okay = ehci_readl(ehci, &ehci->regs->intr_enable);
213 ehci_dbg(ehci, "resume root hub%s\n",
214 power_okay ? "" : " after power loss");
215
216 /* at least some APM implementations will try to deliver
217 * IRQs right away, so delay them until we're ready.
218 */
219 ehci_writel(ehci, 0, &ehci->regs->intr_enable);
220
221 /* re-init operational registers */
222 ehci_writel(ehci, 0, &ehci->regs->segment);
223 ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
224 ehci_writel(ehci, (u32) ehci->async->qh_dma, &ehci->regs->async_next);
225
226 /* restore CMD_RUN, framelist size, and irq threshold */
227 ehci_writel(ehci, ehci->command, &ehci->regs->command);
228
229 /* Some controller/firmware combinations need a delay during which
230 * they set up the port statuses. See Bugzilla #8190. */
231 mdelay(8);
232
233 /* manually resume the ports we suspended during bus_suspend() */
234 i = HCS_N_PORTS (ehci->hcs_params);
235 while (i--) {
236 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
237 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
238 if (test_bit(i, &ehci->bus_suspended) &&
239 (temp & PORT_SUSPEND))
240 temp |= PORT_RESUME;
241 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
242 }
243 i = HCS_N_PORTS (ehci->hcs_params);
244 mdelay (20);
245 while (i--) {
246 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
247 if (test_bit(i, &ehci->bus_suspended) &&
248 (temp & PORT_SUSPEND)) {
249 temp &= ~(PORT_RWC_BITS | PORT_RESUME);
250 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
251 ehci_vdbg (ehci, "resumed port %d\n", i + 1);
252 }
253 }
254 (void) ehci_readl(ehci, &ehci->regs->command);
255
256 /* maybe re-activate the schedule(s) */
257 temp = 0;
258 if (ehci->async->qh_next.qh)
259 temp |= CMD_ASE;
260 if (ehci->periodic_sched)
261 temp |= CMD_PSE;
262 if (temp) {
263 ehci->command |= temp;
264 ehci_writel(ehci, ehci->command, &ehci->regs->command);
265 }
266
267 ehci->next_statechange = jiffies + msecs_to_jiffies(5);
268 hcd->state = HC_STATE_RUNNING;
269
270 /* Now we can safely re-enable irqs */
271 ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
272
273 spin_unlock_irq (&ehci->lock);
274 ehci_handover_companion_ports(ehci);
275 return 0;
276 }
277
278 #else
279
280 #define ehci_bus_suspend NULL
281 #define ehci_bus_resume NULL
282
283 #endif /* CONFIG_PM */
284
285 /*-------------------------------------------------------------------------*/
286
287 /* Display the ports dedicated to the companion controller */
288 static ssize_t show_companion(struct device *dev,
289 struct device_attribute *attr,
290 char *buf)
291 {
292 struct ehci_hcd *ehci;
293 int nports, index, n;
294 int count = PAGE_SIZE;
295 char *ptr = buf;
296
297 ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
298 nports = HCS_N_PORTS(ehci->hcs_params);
299
300 for (index = 0; index < nports; ++index) {
301 if (test_bit(index, &ehci->companion_ports)) {
302 n = scnprintf(ptr, count, "%d\n", index + 1);
303 ptr += n;
304 count -= n;
305 }
306 }
307 return ptr - buf;
308 }
309
310 /*
311 * Sets the owner of a port
312 */
313 static void set_owner(struct ehci_hcd *ehci, int portnum, int new_owner)
314 {
315 u32 __iomem *status_reg;
316 u32 port_status;
317 int try;
318
319 status_reg = &ehci->regs->port_status[portnum];
320
321 /*
322 * The controller won't set the OWNER bit if the port is
323 * enabled, so this loop will sometimes require at least two
324 * iterations: one to disable the port and one to set OWNER.
325 */
326 for (try = 4; try > 0; --try) {
327 spin_lock_irq(&ehci->lock);
328 port_status = ehci_readl(ehci, status_reg);
329 if ((port_status & PORT_OWNER) == new_owner
330 || (port_status & (PORT_OWNER | PORT_CONNECT))
331 == 0)
332 try = 0;
333 else {
334 port_status ^= PORT_OWNER;
335 port_status &= ~(PORT_PE | PORT_RWC_BITS);
336 ehci_writel(ehci, port_status, status_reg);
337 }
338 spin_unlock_irq(&ehci->lock);
339 if (try > 1)
340 msleep(5);
341 }
342 }
343
344 /*
345 * Dedicate or undedicate a port to the companion controller.
346 * Syntax is "[-]portnum", where a leading '-' sign means
347 * return control of the port to the EHCI controller.
348 */
349 static ssize_t store_companion(struct device *dev,
350 struct device_attribute *attr,
351 const char *buf, size_t count)
352 {
353 struct ehci_hcd *ehci;
354 int portnum, new_owner;
355
356 ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
357 new_owner = PORT_OWNER; /* Owned by companion */
358 if (sscanf(buf, "%d", &portnum) != 1)
359 return -EINVAL;
360 if (portnum < 0) {
361 portnum = - portnum;
362 new_owner = 0; /* Owned by EHCI */
363 }
364 if (portnum <= 0 || portnum > HCS_N_PORTS(ehci->hcs_params))
365 return -ENOENT;
366 portnum--;
367 if (new_owner)
368 set_bit(portnum, &ehci->companion_ports);
369 else
370 clear_bit(portnum, &ehci->companion_ports);
371 set_owner(ehci, portnum, new_owner);
372 return count;
373 }
374 static DEVICE_ATTR(companion, 0644, show_companion, store_companion);
375
376 static inline void create_companion_file(struct ehci_hcd *ehci)
377 {
378 int i;
379
380 /* with integrated TT there is no companion! */
381 if (!ehci_is_TDI(ehci))
382 i = device_create_file(ehci_to_hcd(ehci)->self.dev,
383 &dev_attr_companion);
384 }
385
386 static inline void remove_companion_file(struct ehci_hcd *ehci)
387 {
388 /* with integrated TT there is no companion! */
389 if (!ehci_is_TDI(ehci))
390 device_remove_file(ehci_to_hcd(ehci)->self.dev,
391 &dev_attr_companion);
392 }
393
394
395 /*-------------------------------------------------------------------------*/
396
397 static int check_reset_complete (
398 struct ehci_hcd *ehci,
399 int index,
400 u32 __iomem *status_reg,
401 int port_status
402 ) {
403 if (!(port_status & PORT_CONNECT))
404 return port_status;
405
406 /* if reset finished and it's still not enabled -- handoff */
407 if (!(port_status & PORT_PE)) {
408
409 /* with integrated TT, there's nobody to hand it to! */
410 if (ehci_is_TDI(ehci)) {
411 ehci_dbg (ehci,
412 "Failed to enable port %d on root hub TT\n",
413 index+1);
414 return port_status;
415 }
416
417 ehci_dbg (ehci, "port %d full speed --> companion\n",
418 index + 1);
419
420 // what happens if HCS_N_CC(params) == 0 ?
421 port_status |= PORT_OWNER;
422 port_status &= ~PORT_RWC_BITS;
423 ehci_writel(ehci, port_status, status_reg);
424
425 } else
426 ehci_dbg (ehci, "port %d high speed\n", index + 1);
427
428 return port_status;
429 }
430
431 /*-------------------------------------------------------------------------*/
432
433
434 /* build "status change" packet (one or two bytes) from HC registers */
435
436 static int
437 ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
438 {
439 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
440 u32 temp, status = 0;
441 u32 mask;
442 int ports, i, retval = 1;
443 unsigned long flags;
444
445 /* if !USB_SUSPEND, root hub timers won't get shut down ... */
446 if (!HC_IS_RUNNING(hcd->state))
447 return 0;
448
449 /* init status to no-changes */
450 buf [0] = 0;
451 ports = HCS_N_PORTS (ehci->hcs_params);
452 if (ports > 7) {
453 buf [1] = 0;
454 retval++;
455 }
456
457 /* Some boards (mostly VIA?) report bogus overcurrent indications,
458 * causing massive log spam unless we completely ignore them. It
459 * may be relevant that VIA VT8235 controllers, where PORT_POWER is
460 * always set, seem to clear PORT_OCC and PORT_CSC when writing to
461 * PORT_POWER; that's surprising, but maybe within-spec.
462 */
463 if (!ignore_oc)
464 mask = PORT_CSC | PORT_PEC | PORT_OCC;
465 else
466 mask = PORT_CSC | PORT_PEC;
467 // PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
468
469 /* no hub change reports (bit 0) for now (power, ...) */
470
471 /* port N changes (bit N)? */
472 spin_lock_irqsave (&ehci->lock, flags);
473 for (i = 0; i < ports; i++) {
474 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
475
476 /*
477 * Return status information even for ports with OWNER set.
478 * Otherwise khubd wouldn't see the disconnect event when a
479 * high-speed device is switched over to the companion
480 * controller by the user.
481 */
482
483 if ((temp & mask) != 0 || test_bit(i, &ehci->port_c_suspend)
484 || (ehci->reset_done[i] && time_after_eq(
485 jiffies, ehci->reset_done[i]))) {
486 if (i < 7)
487 buf [0] |= 1 << (i + 1);
488 else
489 buf [1] |= 1 << (i - 7);
490 status = STS_PCD;
491 }
492 }
493 /* FIXME autosuspend idle root hubs */
494 spin_unlock_irqrestore (&ehci->lock, flags);
495 return status ? retval : 0;
496 }
497
498 /*-------------------------------------------------------------------------*/
499
500 static void
501 ehci_hub_descriptor (
502 struct ehci_hcd *ehci,
503 struct usb_hub_descriptor *desc
504 ) {
505 int ports = HCS_N_PORTS (ehci->hcs_params);
506 u16 temp;
507
508 desc->bDescriptorType = 0x29;
509 desc->bPwrOn2PwrGood = 10; /* ehci 1.0, 2.3.9 says 20ms max */
510 desc->bHubContrCurrent = 0;
511
512 desc->bNbrPorts = ports;
513 temp = 1 + (ports / 8);
514 desc->bDescLength = 7 + 2 * temp;
515
516 /* two bitmaps: ports removable, and usb 1.0 legacy PortPwrCtrlMask */
517 memset (&desc->bitmap [0], 0, temp);
518 memset (&desc->bitmap [temp], 0xff, temp);
519
520 temp = 0x0008; /* per-port overcurrent reporting */
521 if (HCS_PPC (ehci->hcs_params))
522 temp |= 0x0001; /* per-port power control */
523 else
524 temp |= 0x0002; /* no power switching */
525 #if 0
526 // re-enable when we support USB_PORT_FEAT_INDICATOR below.
527 if (HCS_INDICATOR (ehci->hcs_params))
528 temp |= 0x0080; /* per-port indicators (LEDs) */
529 #endif
530 desc->wHubCharacteristics = cpu_to_le16(temp);
531 }
532
533 /*-------------------------------------------------------------------------*/
534
535 static int ehci_hub_control (
536 struct usb_hcd *hcd,
537 u16 typeReq,
538 u16 wValue,
539 u16 wIndex,
540 char *buf,
541 u16 wLength
542 ) {
543 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
544 int ports = HCS_N_PORTS (ehci->hcs_params);
545 u32 __iomem *status_reg = &ehci->regs->port_status[
546 (wIndex & 0xff) - 1];
547 u32 temp, status;
548 unsigned long flags;
549 int retval = 0;
550 unsigned selector;
551
552 /*
553 * FIXME: support SetPortFeatures USB_PORT_FEAT_INDICATOR.
554 * HCS_INDICATOR may say we can change LEDs to off/amber/green.
555 * (track current state ourselves) ... blink for diagnostics,
556 * power, "this is the one", etc. EHCI spec supports this.
557 */
558
559 spin_lock_irqsave (&ehci->lock, flags);
560 switch (typeReq) {
561 case ClearHubFeature:
562 switch (wValue) {
563 case C_HUB_LOCAL_POWER:
564 case C_HUB_OVER_CURRENT:
565 /* no hub-wide feature/status flags */
566 break;
567 default:
568 goto error;
569 }
570 break;
571 case ClearPortFeature:
572 if (!wIndex || wIndex > ports)
573 goto error;
574 wIndex--;
575 temp = ehci_readl(ehci, status_reg);
576
577 /*
578 * Even if OWNER is set, so the port is owned by the
579 * companion controller, khubd needs to be able to clear
580 * the port-change status bits (especially
581 * USB_PORT_FEAT_C_CONNECTION).
582 */
583
584 switch (wValue) {
585 case USB_PORT_FEAT_ENABLE:
586 ehci_writel(ehci, temp & ~PORT_PE, status_reg);
587 break;
588 case USB_PORT_FEAT_C_ENABLE:
589 ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_PEC,
590 status_reg);
591 break;
592 case USB_PORT_FEAT_SUSPEND:
593 if (temp & PORT_RESET)
594 goto error;
595 if (ehci->no_selective_suspend)
596 break;
597 if (temp & PORT_SUSPEND) {
598 if ((temp & PORT_PE) == 0)
599 goto error;
600 /* resume signaling for 20 msec */
601 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
602 ehci_writel(ehci, temp | PORT_RESUME,
603 status_reg);
604 ehci->reset_done [wIndex] = jiffies
605 + msecs_to_jiffies (20);
606 }
607 break;
608 case USB_PORT_FEAT_C_SUSPEND:
609 clear_bit(wIndex, &ehci->port_c_suspend);
610 break;
611 case USB_PORT_FEAT_POWER:
612 if (HCS_PPC (ehci->hcs_params))
613 ehci_writel(ehci,
614 temp & ~(PORT_RWC_BITS | PORT_POWER),
615 status_reg);
616 break;
617 case USB_PORT_FEAT_C_CONNECTION:
618 ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_CSC,
619 status_reg);
620 break;
621 case USB_PORT_FEAT_C_OVER_CURRENT:
622 ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_OCC,
623 status_reg);
624 break;
625 case USB_PORT_FEAT_C_RESET:
626 /* GetPortStatus clears reset */
627 break;
628 default:
629 goto error;
630 }
631 ehci_readl(ehci, &ehci->regs->command); /* unblock posted write */
632 break;
633 case GetHubDescriptor:
634 ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
635 buf);
636 break;
637 case GetHubStatus:
638 /* no hub-wide feature/status flags */
639 memset (buf, 0, 4);
640 //cpu_to_le32s ((u32 *) buf);
641 break;
642 case GetPortStatus:
643 if (!wIndex || wIndex > ports)
644 goto error;
645 wIndex--;
646 status = 0;
647 temp = ehci_readl(ehci, status_reg);
648
649 // wPortChange bits
650 if (temp & PORT_CSC)
651 status |= 1 << USB_PORT_FEAT_C_CONNECTION;
652 if (temp & PORT_PEC)
653 status |= 1 << USB_PORT_FEAT_C_ENABLE;
654
655 if ((temp & PORT_OCC) && !ignore_oc){
656 status |= 1 << USB_PORT_FEAT_C_OVER_CURRENT;
657
658 /*
659 * Hubs should disable port power on over-current.
660 * However, not all EHCI implementations do this
661 * automatically, even if they _do_ support per-port
662 * power switching; they're allowed to just limit the
663 * current. khubd will turn the power back on.
664 */
665 if (HCS_PPC (ehci->hcs_params)){
666 ehci_writel(ehci,
667 temp & ~(PORT_RWC_BITS | PORT_POWER),
668 status_reg);
669 }
670 }
671
672 /* whoever resumes must GetPortStatus to complete it!! */
673 if (temp & PORT_RESUME) {
674
675 /* Remote Wakeup received? */
676 if (!ehci->reset_done[wIndex]) {
677 /* resume signaling for 20 msec */
678 ehci->reset_done[wIndex] = jiffies
679 + msecs_to_jiffies(20);
680 /* check the port again */
681 mod_timer(&ehci_to_hcd(ehci)->rh_timer,
682 ehci->reset_done[wIndex]);
683 }
684
685 /* resume completed? */
686 else if (time_after_eq(jiffies,
687 ehci->reset_done[wIndex])) {
688 clear_bit(wIndex, &ehci->suspended_ports);
689 set_bit(wIndex, &ehci->port_c_suspend);
690 ehci->reset_done[wIndex] = 0;
691
692 /* stop resume signaling */
693 temp = ehci_readl(ehci, status_reg);
694 ehci_writel(ehci,
695 temp & ~(PORT_RWC_BITS | PORT_RESUME),
696 status_reg);
697 retval = handshake(ehci, status_reg,
698 PORT_RESUME, 0, 2000 /* 2msec */);
699 if (retval != 0) {
700 ehci_err(ehci,
701 "port %d resume error %d\n",
702 wIndex + 1, retval);
703 goto error;
704 }
705 temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10));
706 }
707 }
708
709 /* whoever resets must GetPortStatus to complete it!! */
710 if ((temp & PORT_RESET)
711 && time_after_eq(jiffies,
712 ehci->reset_done[wIndex])) {
713 status |= 1 << USB_PORT_FEAT_C_RESET;
714 ehci->reset_done [wIndex] = 0;
715
716 /* force reset to complete */
717 ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESET),
718 status_reg);
719 /* REVISIT: some hardware needs 550+ usec to clear
720 * this bit; seems too long to spin routinely...
721 */
722 retval = handshake(ehci, status_reg,
723 PORT_RESET, 0, 750);
724 if (retval != 0) {
725 ehci_err (ehci, "port %d reset error %d\n",
726 wIndex + 1, retval);
727 goto error;
728 }
729
730 /* see what we found out */
731 temp = check_reset_complete (ehci, wIndex, status_reg,
732 ehci_readl(ehci, status_reg));
733 }
734
735 if (!(temp & (PORT_RESUME|PORT_RESET)))
736 ehci->reset_done[wIndex] = 0;
737
738 /* transfer dedicated ports to the companion hc */
739 if ((temp & PORT_CONNECT) &&
740 test_bit(wIndex, &ehci->companion_ports)) {
741 temp &= ~PORT_RWC_BITS;
742 temp |= PORT_OWNER;
743 ehci_writel(ehci, temp, status_reg);
744 ehci_dbg(ehci, "port %d --> companion\n", wIndex + 1);
745 temp = ehci_readl(ehci, status_reg);
746 }
747
748 /*
749 * Even if OWNER is set, there's no harm letting khubd
750 * see the wPortStatus values (they should all be 0 except
751 * for PORT_POWER anyway).
752 */
753
754 if (temp & PORT_CONNECT) {
755 status |= 1 << USB_PORT_FEAT_CONNECTION;
756 // status may be from integrated TT
757 status |= ehci_port_speed(ehci, temp);
758 }
759 if (temp & PORT_PE)
760 status |= 1 << USB_PORT_FEAT_ENABLE;
761
762 /* maybe the port was unsuspended without our knowledge */
763 if (temp & (PORT_SUSPEND|PORT_RESUME)) {
764 status |= 1 << USB_PORT_FEAT_SUSPEND;
765 } else if (test_bit(wIndex, &ehci->suspended_ports)) {
766 clear_bit(wIndex, &ehci->suspended_ports);
767 ehci->reset_done[wIndex] = 0;
768 if (temp & PORT_PE)
769 set_bit(wIndex, &ehci->port_c_suspend);
770 }
771
772 if (temp & PORT_OC)
773 status |= 1 << USB_PORT_FEAT_OVER_CURRENT;
774 if (temp & PORT_RESET)
775 status |= 1 << USB_PORT_FEAT_RESET;
776 if (temp & PORT_POWER)
777 status |= 1 << USB_PORT_FEAT_POWER;
778 if (test_bit(wIndex, &ehci->port_c_suspend))
779 status |= 1 << USB_PORT_FEAT_C_SUSPEND;
780
781 #ifndef VERBOSE_DEBUG
782 if (status & ~0xffff) /* only if wPortChange is interesting */
783 #endif
784 dbg_port (ehci, "GetStatus", wIndex + 1, temp);
785 put_unaligned_le32(status, buf);
786 break;
787 case SetHubFeature:
788 switch (wValue) {
789 case C_HUB_LOCAL_POWER:
790 case C_HUB_OVER_CURRENT:
791 /* no hub-wide feature/status flags */
792 break;
793 default:
794 goto error;
795 }
796 break;
797 case SetPortFeature:
798 selector = wIndex >> 8;
799 wIndex &= 0xff;
800 if (!wIndex || wIndex > ports)
801 goto error;
802 wIndex--;
803 temp = ehci_readl(ehci, status_reg);
804 if (temp & PORT_OWNER)
805 break;
806
807 temp &= ~PORT_RWC_BITS;
808 switch (wValue) {
809 case USB_PORT_FEAT_SUSPEND:
810 if (ehci->no_selective_suspend)
811 break;
812 if ((temp & PORT_PE) == 0
813 || (temp & PORT_RESET) != 0)
814 goto error;
815 ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
816 set_bit(wIndex, &ehci->suspended_ports);
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
891 static int ehci_port_handed_over(struct usb_hcd *hcd, int portnum)
892 {
893 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
894 u32 __iomem *reg;
895
896 if (ehci_is_TDI(ehci))
897 return 0;
898 reg = &ehci->regs->port_status[portnum - 1];
899 return ehci_readl(ehci, reg) & PORT_OWNER;
900 }
Linux 2.6 libata-dev (mirror)