?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
USB: EHCI: add separate IAA watchdog timer
[linux-2.6/mini2440.git] / drivers / usb / host / ehci-hub.c
bloba249d03a50244ee678cd2df8128ab930d295ef5b
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
127 port = HCS_N_PORTS (ehci->hcs_params);
128 spin_lock_irq (&ehci->lock);
129
130 /* stop schedules, clean any completed work */
131 if (HC_IS_RUNNING(hcd->state)) {
132 ehci_quiesce (ehci);
133 hcd->state = HC_STATE_QUIESCING;
134 }
135 ehci->command = ehci_readl(ehci, &ehci->regs->command);
136 if (ehci->reclaim)
137 end_unlink_async(ehci);
138 ehci_work(ehci);
139
140 /* Unlike other USB host controller types, EHCI doesn't have
141 * any notion of "global" or bus-wide suspend. The driver has
142 * to manually suspend all the active unsuspended ports, and
143 * then manually resume them in the bus_resume() routine.
144 */
145 ehci->bus_suspended = 0;
146 ehci->owned_ports = 0;
147 while (port--) {
148 u32 __iomem *reg = &ehci->regs->port_status [port];
149 u32 t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
150 u32 t2 = t1;
151
152 /* keep track of which ports we suspend */
153 if (t1 & PORT_OWNER)
154 set_bit(port, &ehci->owned_ports);
155 else if ((t1 & PORT_PE) && !(t1 & PORT_SUSPEND)) {
156 t2 |= PORT_SUSPEND;
157 set_bit(port, &ehci->bus_suspended);
158 }
159
160 /* enable remote wakeup on all ports */
161 if (device_may_wakeup(&hcd->self.root_hub->dev))
162 t2 |= PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E;
163 else
164 t2 &= ~(PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E);
165
166 if (t1 != t2) {
167 ehci_vdbg (ehci, "port %d, %08x -> %08x\n",
168 port + 1, t1, t2);
169 ehci_writel(ehci, t2, reg);
170 }
171 }
172
173 /* turn off now-idle HC */
174 del_timer_sync (&ehci->watchdog);
175 ehci_halt (ehci);
176 hcd->state = HC_STATE_SUSPENDED;
177
178 /* allow remote wakeup */
179 mask = INTR_MASK;
180 if (!device_may_wakeup(&hcd->self.root_hub->dev))
181 mask &= ~STS_PCD;
182 ehci_writel(ehci, mask, &ehci->regs->intr_enable);
183 ehci_readl(ehci, &ehci->regs->intr_enable);
184
185 ehci->next_statechange = jiffies + msecs_to_jiffies(10);
186 spin_unlock_irq (&ehci->lock);
187 return 0;
188 }
189
190
191 /* caller has locked the root hub, and should reset/reinit on error */
192 static int ehci_bus_resume (struct usb_hcd *hcd)
193 {
194 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
195 u32 temp;
196 u32 power_okay;
197 int i;
198
199 if (time_before (jiffies, ehci->next_statechange))
200 msleep(5);
201 spin_lock_irq (&ehci->lock);
202 if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
203 spin_unlock_irq(&ehci->lock);
204 return -ESHUTDOWN;
205 }
206
207 /* Ideally and we've got a real resume here, and no port's power
208 * was lost. (For PCI, that means Vaux was maintained.) But we
209 * could instead be restoring a swsusp snapshot -- so that BIOS was
210 * the last user of the controller, not reset/pm hardware keeping
211 * state we gave to it.
212 */
213 power_okay = ehci_readl(ehci, &ehci->regs->intr_enable);
214 ehci_dbg(ehci, "resume root hub%s\n",
215 power_okay ? "" : " after power loss");
216
217 /* at least some APM implementations will try to deliver
218 * IRQs right away, so delay them until we're ready.
219 */
220 ehci_writel(ehci, 0, &ehci->regs->intr_enable);
221
222 /* re-init operational registers */
223 ehci_writel(ehci, 0, &ehci->regs->segment);
224 ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
225 ehci_writel(ehci, (u32) ehci->async->qh_dma, &ehci->regs->async_next);
226
227 /* restore CMD_RUN, framelist size, and irq threshold */
228 ehci_writel(ehci, ehci->command, &ehci->regs->command);
229
230 /* Some controller/firmware combinations need a delay during which
231 * they set up the port statuses. See Bugzilla #8190. */
232 mdelay(8);
233
234 /* manually resume the ports we suspended during bus_suspend() */
235 i = HCS_N_PORTS (ehci->hcs_params);
236 while (i--) {
237 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
238 temp &= ~(PORT_RWC_BITS
239 | PORT_WKOC_E | PORT_WKDISC_E | PORT_WKCONN_E);
240 if (test_bit(i, &ehci->bus_suspended) &&
241 (temp & PORT_SUSPEND)) {
242 ehci->reset_done [i] = jiffies + msecs_to_jiffies (20);
243 temp |= PORT_RESUME;
244 }
245 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
246 }
247 i = HCS_N_PORTS (ehci->hcs_params);
248 mdelay (20);
249 while (i--) {
250 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
251 if (test_bit(i, &ehci->bus_suspended) &&
252 (temp & PORT_SUSPEND)) {
253 temp &= ~(PORT_RWC_BITS | PORT_RESUME);
254 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
255 ehci_vdbg (ehci, "resumed port %d\n", i + 1);
256 }
257 }
258 (void) ehci_readl(ehci, &ehci->regs->command);
259
260 /* maybe re-activate the schedule(s) */
261 temp = 0;
262 if (ehci->async->qh_next.qh)
263 temp |= CMD_ASE;
264 if (ehci->periodic_sched)
265 temp |= CMD_PSE;
266 if (temp) {
267 ehci->command |= temp;
268 ehci_writel(ehci, ehci->command, &ehci->regs->command);
269 }
270
271 ehci->next_statechange = jiffies + msecs_to_jiffies(5);
272 hcd->state = HC_STATE_RUNNING;
273
274 /* Now we can safely re-enable irqs */
275 ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
276
277 spin_unlock_irq (&ehci->lock);
278
279 if (!power_okay)
280 ehci_handover_companion_ports(ehci);
281 return 0;
282 }
283
284 #else
285
286 #define ehci_bus_suspend NULL
287 #define ehci_bus_resume NULL
288
289 #endif /* CONFIG_PM */
290
291 /*-------------------------------------------------------------------------*/
292
293 /* Display the ports dedicated to the companion controller */
294 static ssize_t show_companion(struct device *dev,
295 struct device_attribute *attr,
296 char *buf)
297 {
298 struct ehci_hcd *ehci;
299 int nports, index, n;
300 int count = PAGE_SIZE;
301 char *ptr = buf;
302
303 ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
304 nports = HCS_N_PORTS(ehci->hcs_params);
305
306 for (index = 0; index < nports; ++index) {
307 if (test_bit(index, &ehci->companion_ports)) {
308 n = scnprintf(ptr, count, "%d\n", index + 1);
309 ptr += n;
310 count -= n;
311 }
312 }
313 return ptr - buf;
314 }
315
316 /*
317 * Sets the owner of a port
318 */
319 static void set_owner(struct ehci_hcd *ehci, int portnum, int new_owner)
320 {
321 u32 __iomem *status_reg;
322 u32 port_status;
323 int try;
324
325 status_reg = &ehci->regs->port_status[portnum];
326
327 /*
328 * The controller won't set the OWNER bit if the port is
329 * enabled, so this loop will sometimes require at least two
330 * iterations: one to disable the port and one to set OWNER.
331 */
332 for (try = 4; try > 0; --try) {
333 spin_lock_irq(&ehci->lock);
334 port_status = ehci_readl(ehci, status_reg);
335 if ((port_status & PORT_OWNER) == new_owner
336 || (port_status & (PORT_OWNER | PORT_CONNECT))
337 == 0)
338 try = 0;
339 else {
340 port_status ^= PORT_OWNER;
341 port_status &= ~(PORT_PE | PORT_RWC_BITS);
342 ehci_writel(ehci, port_status, status_reg);
343 }
344 spin_unlock_irq(&ehci->lock);
345 if (try > 1)
346 msleep(5);
347 }
348 }
349
350 /*
351 * Dedicate or undedicate a port to the companion controller.
352 * Syntax is "[-]portnum", where a leading '-' sign means
353 * return control of the port to the EHCI controller.
354 */
355 static ssize_t store_companion(struct device *dev,
356 struct device_attribute *attr,
357 const char *buf, size_t count)
358 {
359 struct ehci_hcd *ehci;
360 int portnum, new_owner;
361
362 ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
363 new_owner = PORT_OWNER; /* Owned by companion */
364 if (sscanf(buf, "%d", &portnum) != 1)
365 return -EINVAL;
366 if (portnum < 0) {
367 portnum = - portnum;
368 new_owner = 0; /* Owned by EHCI */
369 }
370 if (portnum <= 0 || portnum > HCS_N_PORTS(ehci->hcs_params))
371 return -ENOENT;
372 portnum--;
373 if (new_owner)
374 set_bit(portnum, &ehci->companion_ports);
375 else
376 clear_bit(portnum, &ehci->companion_ports);
377 set_owner(ehci, portnum, new_owner);
378 return count;
379 }
380 static DEVICE_ATTR(companion, 0644, show_companion, store_companion);
381
382 static inline void create_companion_file(struct ehci_hcd *ehci)
383 {
384 int i;
385
386 /* with integrated TT there is no companion! */
387 if (!ehci_is_TDI(ehci))
388 i = device_create_file(ehci_to_hcd(ehci)->self.dev,
389 &dev_attr_companion);
390 }
391
392 static inline void remove_companion_file(struct ehci_hcd *ehci)
393 {
394 /* with integrated TT there is no companion! */
395 if (!ehci_is_TDI(ehci))
396 device_remove_file(ehci_to_hcd(ehci)->self.dev,
397 &dev_attr_companion);
398 }
399
400
401 /*-------------------------------------------------------------------------*/
402
403 static int check_reset_complete (
404 struct ehci_hcd *ehci,
405 int index,
406 u32 __iomem *status_reg,
407 int port_status
408 ) {
409 if (!(port_status & PORT_CONNECT)) {
410 ehci->reset_done [index] = 0;
411 return port_status;
412 }
413
414 /* if reset finished and it's still not enabled -- handoff */
415 if (!(port_status & PORT_PE)) {
416
417 /* with integrated TT, there's nobody to hand it to! */
418 if (ehci_is_TDI(ehci)) {
419 ehci_dbg (ehci,
420 "Failed to enable port %d on root hub TT\n",
421 index+1);
422 return port_status;
423 }
424
425 ehci_dbg (ehci, "port %d full speed --> companion\n",
426 index + 1);
427
428 // what happens if HCS_N_CC(params) == 0 ?
429 port_status |= PORT_OWNER;
430 port_status &= ~PORT_RWC_BITS;
431 ehci_writel(ehci, port_status, status_reg);
432
433 } else
434 ehci_dbg (ehci, "port %d high speed\n", index + 1);
435
436 return port_status;
437 }
438
439 /*-------------------------------------------------------------------------*/
440
441
442 /* build "status change" packet (one or two bytes) from HC registers */
443
444 static int
445 ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
446 {
447 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
448 u32 temp, status = 0;
449 u32 mask;
450 int ports, i, retval = 1;
451 unsigned long flags;
452
453 /* if !USB_SUSPEND, root hub timers won't get shut down ... */
454 if (!HC_IS_RUNNING(hcd->state))
455 return 0;
456
457 /* init status to no-changes */
458 buf [0] = 0;
459 ports = HCS_N_PORTS (ehci->hcs_params);
460 if (ports > 7) {
461 buf [1] = 0;
462 retval++;
463 }
464
465 /* Some boards (mostly VIA?) report bogus overcurrent indications,
466 * causing massive log spam unless we completely ignore them. It
467 * may be relevant that VIA VT8235 controllers, where PORT_POWER is
468 * always set, seem to clear PORT_OCC and PORT_CSC when writing to
469 * PORT_POWER; that's surprising, but maybe within-spec.
470 */
471 if (!ignore_oc)
472 mask = PORT_CSC | PORT_PEC | PORT_OCC;
473 else
474 mask = PORT_CSC | PORT_PEC;
475 // PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
476
477 /* no hub change reports (bit 0) for now (power, ...) */
478
479 /* port N changes (bit N)? */
480 spin_lock_irqsave (&ehci->lock, flags);
481 for (i = 0; i < ports; i++) {
482 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
483
484 /*
485 * Return status information even for ports with OWNER set.
486 * Otherwise khubd wouldn't see the disconnect event when a
487 * high-speed device is switched over to the companion
488 * controller by the user.
489 */
490
491 if (!(temp & PORT_CONNECT))
492 ehci->reset_done [i] = 0;
493 if ((temp & mask) != 0
494 || ((temp & PORT_RESUME) != 0
495 && time_after_eq(jiffies,
496 ehci->reset_done[i]))) {
497 if (i < 7)
498 buf [0] |= 1 << (i + 1);
499 else
500 buf [1] |= 1 << (i - 7);
501 status = STS_PCD;
502 }
503 }
504 /* FIXME autosuspend idle root hubs */
505 spin_unlock_irqrestore (&ehci->lock, flags);
506 return status ? retval : 0;
507 }
508
509 /*-------------------------------------------------------------------------*/
510
511 static void
512 ehci_hub_descriptor (
513 struct ehci_hcd *ehci,
514 struct usb_hub_descriptor *desc
515 ) {
516 int ports = HCS_N_PORTS (ehci->hcs_params);
517 u16 temp;
518
519 desc->bDescriptorType = 0x29;
520 desc->bPwrOn2PwrGood = 10; /* ehci 1.0, 2.3.9 says 20ms max */
521 desc->bHubContrCurrent = 0;
522
523 desc->bNbrPorts = ports;
524 temp = 1 + (ports / 8);
525 desc->bDescLength = 7 + 2 * temp;
526
527 /* two bitmaps: ports removable, and usb 1.0 legacy PortPwrCtrlMask */
528 memset (&desc->bitmap [0], 0, temp);
529 memset (&desc->bitmap [temp], 0xff, temp);
530
531 temp = 0x0008; /* per-port overcurrent reporting */
532 if (HCS_PPC (ehci->hcs_params))
533 temp |= 0x0001; /* per-port power control */
534 else
535 temp |= 0x0002; /* no power switching */
536 #if 0
537 // re-enable when we support USB_PORT_FEAT_INDICATOR below.
538 if (HCS_INDICATOR (ehci->hcs_params))
539 temp |= 0x0080; /* per-port indicators (LEDs) */
540 #endif
541 desc->wHubCharacteristics = (__force __u16)cpu_to_le16 (temp);
542 }
543
544 /*-------------------------------------------------------------------------*/
545
546 #define PORT_WAKE_BITS (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
547
548 static int ehci_hub_control (
549 struct usb_hcd *hcd,
550 u16 typeReq,
551 u16 wValue,
552 u16 wIndex,
553 char *buf,
554 u16 wLength
555 ) {
556 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
557 int ports = HCS_N_PORTS (ehci->hcs_params);
558 u32 __iomem *status_reg = &ehci->regs->port_status[
559 (wIndex & 0xff) - 1];
560 u32 temp, status;
561 unsigned long flags;
562 int retval = 0;
563 unsigned selector;
564
565 /*
566 * FIXME: support SetPortFeatures USB_PORT_FEAT_INDICATOR.
567 * HCS_INDICATOR may say we can change LEDs to off/amber/green.
568 * (track current state ourselves) ... blink for diagnostics,
569 * power, "this is the one", etc. EHCI spec supports this.
570 */
571
572 spin_lock_irqsave (&ehci->lock, flags);
573 switch (typeReq) {
574 case ClearHubFeature:
575 switch (wValue) {
576 case C_HUB_LOCAL_POWER:
577 case C_HUB_OVER_CURRENT:
578 /* no hub-wide feature/status flags */
579 break;
580 default:
581 goto error;
582 }
583 break;
584 case ClearPortFeature:
585 if (!wIndex || wIndex > ports)
586 goto error;
587 wIndex--;
588 temp = ehci_readl(ehci, status_reg);
589
590 /*
591 * Even if OWNER is set, so the port is owned by the
592 * companion controller, khubd needs to be able to clear
593 * the port-change status bits (especially
594 * USB_PORT_FEAT_C_CONNECTION).
595 */
596
597 switch (wValue) {
598 case USB_PORT_FEAT_ENABLE:
599 ehci_writel(ehci, temp & ~PORT_PE, status_reg);
600 break;
601 case USB_PORT_FEAT_C_ENABLE:
602 ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_PEC,
603 status_reg);
604 break;
605 case USB_PORT_FEAT_SUSPEND:
606 if (temp & PORT_RESET)
607 goto error;
608 if (ehci->no_selective_suspend)
609 break;
610 if (temp & PORT_SUSPEND) {
611 if ((temp & PORT_PE) == 0)
612 goto error;
613 /* resume signaling for 20 msec */
614 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
615 ehci_writel(ehci, temp | PORT_RESUME,
616 status_reg);
617 ehci->reset_done [wIndex] = jiffies
618 + msecs_to_jiffies (20);
619 }
620 break;
621 case USB_PORT_FEAT_C_SUSPEND:
622 /* we auto-clear this feature */
623 break;
624 case USB_PORT_FEAT_POWER:
625 if (HCS_PPC (ehci->hcs_params))
626 ehci_writel(ehci,
627 temp & ~(PORT_RWC_BITS | PORT_POWER),
628 status_reg);
629 break;
630 case USB_PORT_FEAT_C_CONNECTION:
631 ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_CSC,
632 status_reg);
633 break;
634 case USB_PORT_FEAT_C_OVER_CURRENT:
635 ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_OCC,
636 status_reg);
637 break;
638 case USB_PORT_FEAT_C_RESET:
639 /* GetPortStatus clears reset */
640 break;
641 default:
642 goto error;
643 }
644 ehci_readl(ehci, &ehci->regs->command); /* unblock posted write */
645 break;
646 case GetHubDescriptor:
647 ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
648 buf);
649 break;
650 case GetHubStatus:
651 /* no hub-wide feature/status flags */
652 memset (buf, 0, 4);
653 //cpu_to_le32s ((u32 *) buf);
654 break;
655 case GetPortStatus:
656 if (!wIndex || wIndex > ports)
657 goto error;
658 wIndex--;
659 status = 0;
660 temp = ehci_readl(ehci, status_reg);
661
662 // wPortChange bits
663 if (temp & PORT_CSC)
664 status |= 1 << USB_PORT_FEAT_C_CONNECTION;
665 if (temp & PORT_PEC)
666 status |= 1 << USB_PORT_FEAT_C_ENABLE;
667
668 if ((temp & PORT_OCC) && !ignore_oc){
669 status |= 1 << USB_PORT_FEAT_C_OVER_CURRENT;
670
671 /*
672 * Hubs should disable port power on over-current.
673 * However, not all EHCI implementations do this
674 * automatically, even if they _do_ support per-port
675 * power switching; they're allowed to just limit the
676 * current. khubd will turn the power back on.
677 */
678 if (HCS_PPC (ehci->hcs_params)){
679 ehci_writel(ehci,
680 temp & ~(PORT_RWC_BITS | PORT_POWER),
681 status_reg);
682 }
683 }
684
685 /* whoever resumes must GetPortStatus to complete it!! */
686 if (temp & PORT_RESUME) {
687
688 /* Remote Wakeup received? */
689 if (!ehci->reset_done[wIndex]) {
690 /* resume signaling for 20 msec */
691 ehci->reset_done[wIndex] = jiffies
692 + msecs_to_jiffies(20);
693 /* check the port again */
694 mod_timer(&ehci_to_hcd(ehci)->rh_timer,
695 ehci->reset_done[wIndex]);
696 }
697
698 /* resume completed? */
699 else if (time_after_eq(jiffies,
700 ehci->reset_done[wIndex])) {
701 status |= 1 << USB_PORT_FEAT_C_SUSPEND;
702 ehci->reset_done[wIndex] = 0;
703
704 /* stop resume signaling */
705 temp = ehci_readl(ehci, status_reg);
706 ehci_writel(ehci,
707 temp & ~(PORT_RWC_BITS | PORT_RESUME),
708 status_reg);
709 retval = handshake(ehci, status_reg,
710 PORT_RESUME, 0, 2000 /* 2msec */);
711 if (retval != 0) {
712 ehci_err(ehci,
713 "port %d resume error %d\n",
714 wIndex + 1, retval);
715 goto error;
716 }
717 temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10));
718 }
719 }
720
721 /* whoever resets must GetPortStatus to complete it!! */
722 if ((temp & PORT_RESET)
723 && time_after_eq(jiffies,
724 ehci->reset_done[wIndex])) {
725 status |= 1 << USB_PORT_FEAT_C_RESET;
726 ehci->reset_done [wIndex] = 0;
727
728 /* force reset to complete */
729 ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESET),
730 status_reg);
731 /* REVISIT: some hardware needs 550+ usec to clear
732 * this bit; seems too long to spin routinely...
733 */
734 retval = handshake(ehci, status_reg,
735 PORT_RESET, 0, 750);
736 if (retval != 0) {
737 ehci_err (ehci, "port %d reset error %d\n",
738 wIndex + 1, retval);
739 goto error;
740 }
741
742 /* see what we found out */
743 temp = check_reset_complete (ehci, wIndex, status_reg,
744 ehci_readl(ehci, status_reg));
745 }
746
747 /* transfer dedicated ports to the companion hc */
748 if ((temp & PORT_CONNECT) &&
749 test_bit(wIndex, &ehci->companion_ports)) {
750 temp &= ~PORT_RWC_BITS;
751 temp |= PORT_OWNER;
752 ehci_writel(ehci, temp, status_reg);
753 ehci_dbg(ehci, "port %d --> companion\n", wIndex + 1);
754 temp = ehci_readl(ehci, status_reg);
755 }
756
757 /*
758 * Even if OWNER is set, there's no harm letting khubd
759 * see the wPortStatus values (they should all be 0 except
760 * for PORT_POWER anyway).
761 */
762
763 if (temp & PORT_CONNECT) {
764 status |= 1 << USB_PORT_FEAT_CONNECTION;
765 // status may be from integrated TT
766 status |= ehci_port_speed(ehci, temp);
767 }
768 if (temp & PORT_PE)
769 status |= 1 << USB_PORT_FEAT_ENABLE;
770 if (temp & (PORT_SUSPEND|PORT_RESUME))
771 status |= 1 << USB_PORT_FEAT_SUSPEND;
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
779 #ifndef EHCI_VERBOSE_DEBUG
780 if (status & ~0xffff) /* only if wPortChange is interesting */
781 #endif
782 dbg_port (ehci, "GetStatus", wIndex + 1, temp);
783 put_unaligned(cpu_to_le32 (status), (__le32 *) buf);
784 break;
785 case SetHubFeature:
786 switch (wValue) {
787 case C_HUB_LOCAL_POWER:
788 case C_HUB_OVER_CURRENT:
789 /* no hub-wide feature/status flags */
790 break;
791 default:
792 goto error;
793 }
794 break;
795 case SetPortFeature:
796 selector = wIndex >> 8;
797 wIndex &= 0xff;
798 if (!wIndex || wIndex > ports)
799 goto error;
800 wIndex--;
801 temp = ehci_readl(ehci, status_reg);
802 if (temp & PORT_OWNER)
803 break;
804
805 temp &= ~PORT_RWC_BITS;
806 switch (wValue) {
807 case USB_PORT_FEAT_SUSPEND:
808 if (ehci->no_selective_suspend)
809 break;
810 if ((temp & PORT_PE) == 0
811 || (temp & PORT_RESET) != 0)
812 goto error;
813 if (device_may_wakeup(&hcd->self.root_hub->dev))
814 temp |= PORT_WAKE_BITS;
815 ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
816 break;
817 case USB_PORT_FEAT_POWER:
818 if (HCS_PPC (ehci->hcs_params))
819 ehci_writel(ehci, temp | PORT_POWER,
820 status_reg);
821 break;
822 case USB_PORT_FEAT_RESET:
823 if (temp & PORT_RESUME)
824 goto error;
825 /* line status bits may report this as low speed,
826 * which can be fine if this root hub has a
827 * transaction translator built in.
828 */
829 if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
830 && !ehci_is_TDI(ehci)
831 && PORT_USB11 (temp)) {
832 ehci_dbg (ehci,
833 "port %d low speed --> companion\n",
834 wIndex + 1);
835 temp |= PORT_OWNER;
836 } else {
837 ehci_vdbg (ehci, "port %d reset\n", wIndex + 1);
838 temp |= PORT_RESET;
839 temp &= ~PORT_PE;
840
841 /*
842 * caller must wait, then call GetPortStatus
843 * usb 2.0 spec says 50 ms resets on root
844 */
845 ehci->reset_done [wIndex] = jiffies
846 + msecs_to_jiffies (50);
847 }
848 ehci_writel(ehci, temp, status_reg);
849 break;
850
851 /* For downstream facing ports (these): one hub port is put
852 * into test mode according to USB2 11.24.2.13, then the hub
853 * must be reset (which for root hub now means rmmod+modprobe,
854 * or else system reboot). See EHCI 2.3.9 and 4.14 for info
855 * about the EHCI-specific stuff.
856 */
857 case USB_PORT_FEAT_TEST:
858 if (!selector || selector > 5)
859 goto error;
860 ehci_quiesce(ehci);
861 ehci_halt(ehci);
862 temp |= selector << 16;
863 ehci_writel(ehci, temp, status_reg);
864 break;
865
866 default:
867 goto error;
868 }
869 ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
870 break;
871
872 default:
873 error:
874 /* "stall" on error */
875 retval = -EPIPE;
876 }
877 spin_unlock_irqrestore (&ehci->lock, flags);
878 return retval;
879 }
880
881 static void ehci_relinquish_port(struct usb_hcd *hcd, int portnum)
882 {
883 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
884
885 if (ehci_is_TDI(ehci))
886 return;
887 set_owner(ehci, --portnum, PORT_OWNER);
888 }
889
Support for the Chinese Samsung S3C2440 based development boards