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Merge 2.6.38-rc5 into staging-next
[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
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 void ehci_adjust_port_wakeup_flags(struct ehci_hcd *ehci,
110 bool suspending, bool do_wakeup)
111 {
112 int port;
113 u32 temp;
114 unsigned long flags;
115
116 /* If remote wakeup is enabled for the root hub but disabled
117 * for the controller, we must adjust all the port wakeup flags
118 * when the controller is suspended or resumed. In all other
119 * cases they don't need to be changed.
120 */
121 if (!ehci_to_hcd(ehci)->self.root_hub->do_remote_wakeup || do_wakeup)
122 return;
123
124 spin_lock_irqsave(&ehci->lock, flags);
125
126 /* clear phy low-power mode before changing wakeup flags */
127 if (ehci->has_hostpc) {
128 port = HCS_N_PORTS(ehci->hcs_params);
129 while (port--) {
130 u32 __iomem *hostpc_reg;
131
132 hostpc_reg = (u32 __iomem *)((u8 *) ehci->regs
133 + HOSTPC0 + 4 * port);
134 temp = ehci_readl(ehci, hostpc_reg);
135 ehci_writel(ehci, temp & ~HOSTPC_PHCD, hostpc_reg);
136 }
137 spin_unlock_irqrestore(&ehci->lock, flags);
138 msleep(5);
139 spin_lock_irqsave(&ehci->lock, flags);
140 }
141
142 port = HCS_N_PORTS(ehci->hcs_params);
143 while (port--) {
144 u32 __iomem *reg = &ehci->regs->port_status[port];
145 u32 t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
146 u32 t2 = t1 & ~PORT_WAKE_BITS;
147
148 /* If we are suspending the controller, clear the flags.
149 * If we are resuming the controller, set the wakeup flags.
150 */
151 if (!suspending) {
152 if (t1 & PORT_CONNECT)
153 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
154 else
155 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
156 }
157 ehci_vdbg(ehci, "port %d, %08x -> %08x\n",
158 port + 1, t1, t2);
159 ehci_writel(ehci, t2, reg);
160 }
161
162 /* enter phy low-power mode again */
163 if (ehci->has_hostpc) {
164 port = HCS_N_PORTS(ehci->hcs_params);
165 while (port--) {
166 u32 __iomem *hostpc_reg;
167
168 hostpc_reg = (u32 __iomem *)((u8 *) ehci->regs
169 + HOSTPC0 + 4 * port);
170 temp = ehci_readl(ehci, hostpc_reg);
171 ehci_writel(ehci, temp | HOSTPC_PHCD, hostpc_reg);
172 }
173 }
174
175 /* Does the root hub have a port wakeup pending? */
176 if (!suspending && (ehci_readl(ehci, &ehci->regs->status) & STS_PCD))
177 usb_hcd_resume_root_hub(ehci_to_hcd(ehci));
178
179 spin_unlock_irqrestore(&ehci->lock, flags);
180 }
181
182 static int ehci_bus_suspend (struct usb_hcd *hcd)
183 {
184 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
185 int port;
186 int mask;
187 int changed;
188
189 ehci_dbg(ehci, "suspend root hub\n");
190
191 if (time_before (jiffies, ehci->next_statechange))
192 msleep(5);
193 del_timer_sync(&ehci->watchdog);
194 del_timer_sync(&ehci->iaa_watchdog);
195
196 spin_lock_irq (&ehci->lock);
197
198 /* Once the controller is stopped, port resumes that are already
199 * in progress won't complete. Hence if remote wakeup is enabled
200 * for the root hub and any ports are in the middle of a resume or
201 * remote wakeup, we must fail the suspend.
202 */
203 if (hcd->self.root_hub->do_remote_wakeup) {
204 port = HCS_N_PORTS(ehci->hcs_params);
205 while (port--) {
206 if (ehci->reset_done[port] != 0) {
207 spin_unlock_irq(&ehci->lock);
208 ehci_dbg(ehci, "suspend failed because "
209 "port %d is resuming\n",
210 port + 1);
211 return -EBUSY;
212 }
213 }
214 }
215
216 /* stop schedules, clean any completed work */
217 if (HC_IS_RUNNING(hcd->state)) {
218 ehci_quiesce (ehci);
219 hcd->state = HC_STATE_QUIESCING;
220 }
221 ehci->command = ehci_readl(ehci, &ehci->regs->command);
222 ehci_work(ehci);
223
224 /* Unlike other USB host controller types, EHCI doesn't have
225 * any notion of "global" or bus-wide suspend. The driver has
226 * to manually suspend all the active unsuspended ports, and
227 * then manually resume them in the bus_resume() routine.
228 */
229 ehci->bus_suspended = 0;
230 ehci->owned_ports = 0;
231 changed = 0;
232 port = HCS_N_PORTS(ehci->hcs_params);
233 while (port--) {
234 u32 __iomem *reg = &ehci->regs->port_status [port];
235 u32 t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
236 u32 t2 = t1 & ~PORT_WAKE_BITS;
237
238 /* keep track of which ports we suspend */
239 if (t1 & PORT_OWNER)
240 set_bit(port, &ehci->owned_ports);
241 else if ((t1 & PORT_PE) && !(t1 & PORT_SUSPEND)) {
242 t2 |= PORT_SUSPEND;
243 set_bit(port, &ehci->bus_suspended);
244 }
245
246 /* enable remote wakeup on all ports, if told to do so */
247 if (hcd->self.root_hub->do_remote_wakeup) {
248 /* only enable appropriate wake bits, otherwise the
249 * hardware can not go phy low power mode. If a race
250 * condition happens here(connection change during bits
251 * set), the port change detection will finally fix it.
252 */
253 if (t1 & PORT_CONNECT)
254 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
255 else
256 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
257 }
258
259 if (t1 != t2) {
260 ehci_vdbg (ehci, "port %d, %08x -> %08x\n",
261 port + 1, t1, t2);
262 ehci_writel(ehci, t2, reg);
263 changed = 1;
264 }
265 }
266
267 if (changed && ehci->has_hostpc) {
268 spin_unlock_irq(&ehci->lock);
269 msleep(5); /* 5 ms for HCD to enter low-power mode */
270 spin_lock_irq(&ehci->lock);
271
272 port = HCS_N_PORTS(ehci->hcs_params);
273 while (port--) {
274 u32 __iomem *hostpc_reg;
275 u32 t3;
276
277 hostpc_reg = (u32 __iomem *)((u8 *) ehci->regs
278 + HOSTPC0 + 4 * port);
279 t3 = ehci_readl(ehci, hostpc_reg);
280 ehci_writel(ehci, t3 | HOSTPC_PHCD, hostpc_reg);
281 t3 = ehci_readl(ehci, hostpc_reg);
282 ehci_dbg(ehci, "Port %d phy low-power mode %s\n",
283 port, (t3 & HOSTPC_PHCD) ?
284 "succeeded" : "failed");
285 }
286 }
287
288 /* Apparently some devices need a >= 1-uframe delay here */
289 if (ehci->bus_suspended)
290 udelay(150);
291
292 /* turn off now-idle HC */
293 ehci_halt (ehci);
294 hcd->state = HC_STATE_SUSPENDED;
295
296 if (ehci->reclaim)
297 end_unlink_async(ehci);
298
299 /* allow remote wakeup */
300 mask = INTR_MASK;
301 if (!hcd->self.root_hub->do_remote_wakeup)
302 mask &= ~STS_PCD;
303 ehci_writel(ehci, mask, &ehci->regs->intr_enable);
304 ehci_readl(ehci, &ehci->regs->intr_enable);
305
306 ehci->next_statechange = jiffies + msecs_to_jiffies(10);
307 spin_unlock_irq (&ehci->lock);
308
309 /* ehci_work() may have re-enabled the watchdog timer, which we do not
310 * want, and so we must delete any pending watchdog timer events.
311 */
312 del_timer_sync(&ehci->watchdog);
313 return 0;
314 }
315
316
317 /* caller has locked the root hub, and should reset/reinit on error */
318 static int ehci_bus_resume (struct usb_hcd *hcd)
319 {
320 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
321 u32 temp;
322 u32 power_okay;
323 int i;
324 u8 resume_needed = 0;
325
326 if (time_before (jiffies, ehci->next_statechange))
327 msleep(5);
328 spin_lock_irq (&ehci->lock);
329 if (!HCD_HW_ACCESSIBLE(hcd)) {
330 spin_unlock_irq(&ehci->lock);
331 return -ESHUTDOWN;
332 }
333
334 if (unlikely(ehci->debug)) {
335 if (!dbgp_reset_prep())
336 ehci->debug = NULL;
337 else
338 dbgp_external_startup();
339 }
340
341 /* Ideally and we've got a real resume here, and no port's power
342 * was lost. (For PCI, that means Vaux was maintained.) But we
343 * could instead be restoring a swsusp snapshot -- so that BIOS was
344 * the last user of the controller, not reset/pm hardware keeping
345 * state we gave to it.
346 */
347 power_okay = ehci_readl(ehci, &ehci->regs->intr_enable);
348 ehci_dbg(ehci, "resume root hub%s\n",
349 power_okay ? "" : " after power loss");
350
351 /* at least some APM implementations will try to deliver
352 * IRQs right away, so delay them until we're ready.
353 */
354 ehci_writel(ehci, 0, &ehci->regs->intr_enable);
355
356 /* re-init operational registers */
357 ehci_writel(ehci, 0, &ehci->regs->segment);
358 ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
359 ehci_writel(ehci, (u32) ehci->async->qh_dma, &ehci->regs->async_next);
360
361 /* restore CMD_RUN, framelist size, and irq threshold */
362 ehci_writel(ehci, ehci->command, &ehci->regs->command);
363
364 /* Some controller/firmware combinations need a delay during which
365 * they set up the port statuses. See Bugzilla #8190. */
366 spin_unlock_irq(&ehci->lock);
367 msleep(8);
368 spin_lock_irq(&ehci->lock);
369
370 /* clear phy low-power mode before resume */
371 if (ehci->bus_suspended && ehci->has_hostpc) {
372 i = HCS_N_PORTS(ehci->hcs_params);
373 while (i--) {
374 if (test_bit(i, &ehci->bus_suspended)) {
375 u32 __iomem *hostpc_reg;
376
377 hostpc_reg = (u32 __iomem *)((u8 *) ehci->regs
378 + HOSTPC0 + 4 * i);
379 temp = ehci_readl(ehci, hostpc_reg);
380 ehci_writel(ehci, temp & ~HOSTPC_PHCD,
381 hostpc_reg);
382 }
383 }
384 spin_unlock_irq(&ehci->lock);
385 msleep(5);
386 spin_lock_irq(&ehci->lock);
387 }
388
389 /* manually resume the ports we suspended during bus_suspend() */
390 i = HCS_N_PORTS (ehci->hcs_params);
391 while (i--) {
392 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
393 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
394 if (test_bit(i, &ehci->bus_suspended) &&
395 (temp & PORT_SUSPEND)) {
396 temp |= PORT_RESUME;
397 resume_needed = 1;
398 }
399 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
400 }
401
402 /* msleep for 20ms only if code is trying to resume port */
403 if (resume_needed) {
404 spin_unlock_irq(&ehci->lock);
405 msleep(20);
406 spin_lock_irq(&ehci->lock);
407 }
408
409 i = HCS_N_PORTS (ehci->hcs_params);
410 while (i--) {
411 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
412 if (test_bit(i, &ehci->bus_suspended) &&
413 (temp & PORT_SUSPEND)) {
414 temp &= ~(PORT_RWC_BITS | PORT_RESUME);
415 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
416 ehci_vdbg (ehci, "resumed port %d\n", i + 1);
417 }
418 }
419 (void) ehci_readl(ehci, &ehci->regs->command);
420
421 /* maybe re-activate the schedule(s) */
422 temp = 0;
423 if (ehci->async->qh_next.qh)
424 temp |= CMD_ASE;
425 if (ehci->periodic_sched)
426 temp |= CMD_PSE;
427 if (temp) {
428 ehci->command |= temp;
429 ehci_writel(ehci, ehci->command, &ehci->regs->command);
430 }
431
432 ehci->next_statechange = jiffies + msecs_to_jiffies(5);
433 hcd->state = HC_STATE_RUNNING;
434
435 /* Now we can safely re-enable irqs */
436 ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
437
438 spin_unlock_irq (&ehci->lock);
439 ehci_handover_companion_ports(ehci);
440 return 0;
441 }
442
443 #else
444
445 #define ehci_bus_suspend NULL
446 #define ehci_bus_resume NULL
447
448 #endif /* CONFIG_PM */
449
450 /*-------------------------------------------------------------------------*/
451
452 /* Display the ports dedicated to the companion controller */
453 static ssize_t show_companion(struct device *dev,
454 struct device_attribute *attr,
455 char *buf)
456 {
457 struct ehci_hcd *ehci;
458 int nports, index, n;
459 int count = PAGE_SIZE;
460 char *ptr = buf;
461
462 ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
463 nports = HCS_N_PORTS(ehci->hcs_params);
464
465 for (index = 0; index < nports; ++index) {
466 if (test_bit(index, &ehci->companion_ports)) {
467 n = scnprintf(ptr, count, "%d\n", index + 1);
468 ptr += n;
469 count -= n;
470 }
471 }
472 return ptr - buf;
473 }
474
475 /*
476 * Sets the owner of a port
477 */
478 static void set_owner(struct ehci_hcd *ehci, int portnum, int new_owner)
479 {
480 u32 __iomem *status_reg;
481 u32 port_status;
482 int try;
483
484 status_reg = &ehci->regs->port_status[portnum];
485
486 /*
487 * The controller won't set the OWNER bit if the port is
488 * enabled, so this loop will sometimes require at least two
489 * iterations: one to disable the port and one to set OWNER.
490 */
491 for (try = 4; try > 0; --try) {
492 spin_lock_irq(&ehci->lock);
493 port_status = ehci_readl(ehci, status_reg);
494 if ((port_status & PORT_OWNER) == new_owner
495 || (port_status & (PORT_OWNER | PORT_CONNECT))
496 == 0)
497 try = 0;
498 else {
499 port_status ^= PORT_OWNER;
500 port_status &= ~(PORT_PE | PORT_RWC_BITS);
501 ehci_writel(ehci, port_status, status_reg);
502 }
503 spin_unlock_irq(&ehci->lock);
504 if (try > 1)
505 msleep(5);
506 }
507 }
508
509 /*
510 * Dedicate or undedicate a port to the companion controller.
511 * Syntax is "[-]portnum", where a leading '-' sign means
512 * return control of the port to the EHCI controller.
513 */
514 static ssize_t store_companion(struct device *dev,
515 struct device_attribute *attr,
516 const char *buf, size_t count)
517 {
518 struct ehci_hcd *ehci;
519 int portnum, new_owner;
520
521 ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
522 new_owner = PORT_OWNER; /* Owned by companion */
523 if (sscanf(buf, "%d", &portnum) != 1)
524 return -EINVAL;
525 if (portnum < 0) {
526 portnum = - portnum;
527 new_owner = 0; /* Owned by EHCI */
528 }
529 if (portnum <= 0 || portnum > HCS_N_PORTS(ehci->hcs_params))
530 return -ENOENT;
531 portnum--;
532 if (new_owner)
533 set_bit(portnum, &ehci->companion_ports);
534 else
535 clear_bit(portnum, &ehci->companion_ports);
536 set_owner(ehci, portnum, new_owner);
537 return count;
538 }
539 static DEVICE_ATTR(companion, 0644, show_companion, store_companion);
540
541 static inline void create_companion_file(struct ehci_hcd *ehci)
542 {
543 int i;
544
545 /* with integrated TT there is no companion! */
546 if (!ehci_is_TDI(ehci))
547 i = device_create_file(ehci_to_hcd(ehci)->self.controller,
548 &dev_attr_companion);
549 }
550
551 static inline void remove_companion_file(struct ehci_hcd *ehci)
552 {
553 /* with integrated TT there is no companion! */
554 if (!ehci_is_TDI(ehci))
555 device_remove_file(ehci_to_hcd(ehci)->self.controller,
556 &dev_attr_companion);
557 }
558
559
560 /*-------------------------------------------------------------------------*/
561
562 static int check_reset_complete (
563 struct ehci_hcd *ehci,
564 int index,
565 u32 __iomem *status_reg,
566 int port_status
567 ) {
568 if (!(port_status & PORT_CONNECT))
569 return port_status;
570
571 /* if reset finished and it's still not enabled -- handoff */
572 if (!(port_status & PORT_PE)) {
573
574 /* with integrated TT, there's nobody to hand it to! */
575 if (ehci_is_TDI(ehci)) {
576 ehci_dbg (ehci,
577 "Failed to enable port %d on root hub TT\n",
578 index+1);
579 return port_status;
580 }
581
582 ehci_dbg (ehci, "port %d full speed --> companion\n",
583 index + 1);
584
585 // what happens if HCS_N_CC(params) == 0 ?
586 port_status |= PORT_OWNER;
587 port_status &= ~PORT_RWC_BITS;
588 ehci_writel(ehci, port_status, status_reg);
589
590 /* ensure 440EPX ohci controller state is operational */
591 if (ehci->has_amcc_usb23)
592 set_ohci_hcfs(ehci, 1);
593 } else {
594 ehci_dbg (ehci, "port %d high speed\n", 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 = 0;
613 u32 mask;
614 int ports, i, retval = 1;
615 unsigned long flags;
616 u32 ppcd = 0;
617
618 /* if !USB_SUSPEND, root hub timers won't get shut down ... */
619 if (!HC_IS_RUNNING(hcd->state))
620 return 0;
621
622 /* init status to no-changes */
623 buf [0] = 0;
624 ports = HCS_N_PORTS (ehci->hcs_params);
625 if (ports > 7) {
626 buf [1] = 0;
627 retval++;
628 }
629
630 /* Some boards (mostly VIA?) report bogus overcurrent indications,
631 * causing massive log spam unless we completely ignore them. It
632 * may be relevant that VIA VT8235 controllers, where PORT_POWER is
633 * always set, seem to clear PORT_OCC and PORT_CSC when writing to
634 * PORT_POWER; that's surprising, but maybe within-spec.
635 */
636 if (!ignore_oc)
637 mask = PORT_CSC | PORT_PEC | PORT_OCC;
638 else
639 mask = PORT_CSC | PORT_PEC;
640 // PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
641
642 /* no hub change reports (bit 0) for now (power, ...) */
643
644 /* port N changes (bit N)? */
645 spin_lock_irqsave (&ehci->lock, flags);
646
647 /* get per-port change detect bits */
648 if (ehci->has_ppcd)
649 ppcd = ehci_readl(ehci, &ehci->regs->status) >> 16;
650
651 for (i = 0; i < ports; i++) {
652 /* leverage per-port change bits feature */
653 if (ehci->has_ppcd && !(ppcd & (1 << i)))
654 continue;
655 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
656
657 /*
658 * Return status information even for ports with OWNER set.
659 * Otherwise khubd wouldn't see the disconnect event when a
660 * high-speed device is switched over to the companion
661 * controller by the user.
662 */
663
664 if ((temp & mask) != 0 || test_bit(i, &ehci->port_c_suspend)
665 || (ehci->reset_done[i] && time_after_eq(
666 jiffies, ehci->reset_done[i]))) {
667 if (i < 7)
668 buf [0] |= 1 << (i + 1);
669 else
670 buf [1] |= 1 << (i - 7);
671 status = STS_PCD;
672 }
673 }
674 /* FIXME autosuspend idle root hubs */
675 spin_unlock_irqrestore (&ehci->lock, flags);
676 return status ? retval : 0;
677 }
678
679 /*-------------------------------------------------------------------------*/
680
681 static void
682 ehci_hub_descriptor (
683 struct ehci_hcd *ehci,
684 struct usb_hub_descriptor *desc
685 ) {
686 int ports = HCS_N_PORTS (ehci->hcs_params);
687 u16 temp;
688
689 desc->bDescriptorType = 0x29;
690 desc->bPwrOn2PwrGood = 10; /* ehci 1.0, 2.3.9 says 20ms max */
691 desc->bHubContrCurrent = 0;
692
693 desc->bNbrPorts = ports;
694 temp = 1 + (ports / 8);
695 desc->bDescLength = 7 + 2 * temp;
696
697 /* two bitmaps: ports removable, and usb 1.0 legacy PortPwrCtrlMask */
698 memset (&desc->bitmap [0], 0, temp);
699 memset (&desc->bitmap [temp], 0xff, temp);
700
701 temp = 0x0008; /* per-port overcurrent reporting */
702 if (HCS_PPC (ehci->hcs_params))
703 temp |= 0x0001; /* per-port power control */
704 else
705 temp |= 0x0002; /* no power switching */
706 #if 0
707 // re-enable when we support USB_PORT_FEAT_INDICATOR below.
708 if (HCS_INDICATOR (ehci->hcs_params))
709 temp |= 0x0080; /* per-port indicators (LEDs) */
710 #endif
711 desc->wHubCharacteristics = cpu_to_le16(temp);
712 }
713
714 /*-------------------------------------------------------------------------*/
715
716 static int ehci_hub_control (
717 struct usb_hcd *hcd,
718 u16 typeReq,
719 u16 wValue,
720 u16 wIndex,
721 char *buf,
722 u16 wLength
723 ) {
724 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
725 int ports = HCS_N_PORTS (ehci->hcs_params);
726 u32 __iomem *status_reg = &ehci->regs->port_status[
727 (wIndex & 0xff) - 1];
728 u32 __iomem *hostpc_reg = NULL;
729 u32 temp, temp1, status;
730 unsigned long flags;
731 int retval = 0;
732 unsigned selector;
733
734 /*
735 * FIXME: support SetPortFeatures USB_PORT_FEAT_INDICATOR.
736 * HCS_INDICATOR may say we can change LEDs to off/amber/green.
737 * (track current state ourselves) ... blink for diagnostics,
738 * power, "this is the one", etc. EHCI spec supports this.
739 */
740
741 if (ehci->has_hostpc)
742 hostpc_reg = (u32 __iomem *)((u8 *)ehci->regs
743 + HOSTPC0 + 4 * ((wIndex & 0xff) - 1));
744 spin_lock_irqsave (&ehci->lock, flags);
745 switch (typeReq) {
746 case ClearHubFeature:
747 switch (wValue) {
748 case C_HUB_LOCAL_POWER:
749 case C_HUB_OVER_CURRENT:
750 /* no hub-wide feature/status flags */
751 break;
752 default:
753 goto error;
754 }
755 break;
756 case ClearPortFeature:
757 if (!wIndex || wIndex > ports)
758 goto error;
759 wIndex--;
760 temp = ehci_readl(ehci, status_reg);
761
762 /*
763 * Even if OWNER is set, so the port is owned by the
764 * companion controller, khubd needs to be able to clear
765 * the port-change status bits (especially
766 * USB_PORT_STAT_C_CONNECTION).
767 */
768
769 switch (wValue) {
770 case USB_PORT_FEAT_ENABLE:
771 ehci_writel(ehci, temp & ~PORT_PE, status_reg);
772 break;
773 case USB_PORT_FEAT_C_ENABLE:
774 ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_PEC,
775 status_reg);
776 break;
777 case USB_PORT_FEAT_SUSPEND:
778 if (temp & PORT_RESET)
779 goto error;
780 if (ehci->no_selective_suspend)
781 break;
782 if (!(temp & PORT_SUSPEND))
783 break;
784 if ((temp & PORT_PE) == 0)
785 goto error;
786
787 /* clear phy low-power mode before resume */
788 if (hostpc_reg) {
789 temp1 = ehci_readl(ehci, hostpc_reg);
790 ehci_writel(ehci, temp1 & ~HOSTPC_PHCD,
791 hostpc_reg);
792 spin_unlock_irqrestore(&ehci->lock, flags);
793 msleep(5);/* wait to leave low-power mode */
794 spin_lock_irqsave(&ehci->lock, flags);
795 }
796 /* resume signaling for 20 msec */
797 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
798 ehci_writel(ehci, temp | PORT_RESUME, status_reg);
799 ehci->reset_done[wIndex] = jiffies
800 + msecs_to_jiffies(20);
801 break;
802 case USB_PORT_FEAT_C_SUSPEND:
803 clear_bit(wIndex, &ehci->port_c_suspend);
804 break;
805 case USB_PORT_FEAT_POWER:
806 if (HCS_PPC (ehci->hcs_params))
807 ehci_writel(ehci,
808 temp & ~(PORT_RWC_BITS | PORT_POWER),
809 status_reg);
810 break;
811 case USB_PORT_FEAT_C_CONNECTION:
812 if (ehci->has_lpm) {
813 /* clear PORTSC bits on disconnect */
814 temp &= ~PORT_LPM;
815 temp &= ~PORT_DEV_ADDR;
816 }
817 ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_CSC,
818 status_reg);
819 break;
820 case USB_PORT_FEAT_C_OVER_CURRENT:
821 ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_OCC,
822 status_reg);
823 break;
824 case USB_PORT_FEAT_C_RESET:
825 /* GetPortStatus clears reset */
826 break;
827 default:
828 goto error;
829 }
830 ehci_readl(ehci, &ehci->regs->command); /* unblock posted write */
831 break;
832 case GetHubDescriptor:
833 ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
834 buf);
835 break;
836 case GetHubStatus:
837 /* no hub-wide feature/status flags */
838 memset (buf, 0, 4);
839 //cpu_to_le32s ((u32 *) buf);
840 break;
841 case GetPortStatus:
842 if (!wIndex || wIndex > ports)
843 goto error;
844 wIndex--;
845 status = 0;
846 temp = ehci_readl(ehci, status_reg);
847
848 // wPortChange bits
849 if (temp & PORT_CSC)
850 status |= USB_PORT_STAT_C_CONNECTION << 16;
851 if (temp & PORT_PEC)
852 status |= USB_PORT_STAT_C_ENABLE << 16;
853
854 if ((temp & PORT_OCC) && !ignore_oc){
855 status |= USB_PORT_STAT_C_OVERCURRENT << 16;
856
857 /*
858 * Hubs should disable port power on over-current.
859 * However, not all EHCI implementations do this
860 * automatically, even if they _do_ support per-port
861 * power switching; they're allowed to just limit the
862 * current. khubd will turn the power back on.
863 */
864 if (HCS_PPC (ehci->hcs_params)){
865 ehci_writel(ehci,
866 temp & ~(PORT_RWC_BITS | PORT_POWER),
867 status_reg);
868 }
869 }
870
871 /* whoever resumes must GetPortStatus to complete it!! */
872 if (temp & PORT_RESUME) {
873
874 /* Remote Wakeup received? */
875 if (!ehci->reset_done[wIndex]) {
876 /* resume signaling for 20 msec */
877 ehci->reset_done[wIndex] = jiffies
878 + msecs_to_jiffies(20);
879 /* check the port again */
880 mod_timer(&ehci_to_hcd(ehci)->rh_timer,
881 ehci->reset_done[wIndex]);
882 }
883
884 /* resume completed? */
885 else if (time_after_eq(jiffies,
886 ehci->reset_done[wIndex])) {
887 clear_bit(wIndex, &ehci->suspended_ports);
888 set_bit(wIndex, &ehci->port_c_suspend);
889 ehci->reset_done[wIndex] = 0;
890
891 /* stop resume signaling */
892 temp = ehci_readl(ehci, status_reg);
893 ehci_writel(ehci,
894 temp & ~(PORT_RWC_BITS | PORT_RESUME),
895 status_reg);
896 retval = handshake(ehci, status_reg,
897 PORT_RESUME, 0, 2000 /* 2msec */);
898 if (retval != 0) {
899 ehci_err(ehci,
900 "port %d resume error %d\n",
901 wIndex + 1, retval);
902 goto error;
903 }
904 temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10));
905 }
906 }
907
908 /* whoever resets must GetPortStatus to complete it!! */
909 if ((temp & PORT_RESET)
910 && time_after_eq(jiffies,
911 ehci->reset_done[wIndex])) {
912 status |= USB_PORT_STAT_C_RESET << 16;
913 ehci->reset_done [wIndex] = 0;
914
915 /* force reset to complete */
916 ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESET),
917 status_reg);
918 /* REVISIT: some hardware needs 550+ usec to clear
919 * this bit; seems too long to spin routinely...
920 */
921 retval = handshake(ehci, status_reg,
922 PORT_RESET, 0, 1000);
923 if (retval != 0) {
924 ehci_err (ehci, "port %d reset error %d\n",
925 wIndex + 1, retval);
926 goto error;
927 }
928
929 /* see what we found out */
930 temp = check_reset_complete (ehci, wIndex, status_reg,
931 ehci_readl(ehci, status_reg));
932 }
933
934 if (!(temp & (PORT_RESUME|PORT_RESET)))
935 ehci->reset_done[wIndex] = 0;
936
937 /* transfer dedicated ports to the companion hc */
938 if ((temp & PORT_CONNECT) &&
939 test_bit(wIndex, &ehci->companion_ports)) {
940 temp &= ~PORT_RWC_BITS;
941 temp |= PORT_OWNER;
942 ehci_writel(ehci, temp, status_reg);
943 ehci_dbg(ehci, "port %d --> companion\n", wIndex + 1);
944 temp = ehci_readl(ehci, status_reg);
945 }
946
947 /*
948 * Even if OWNER is set, there's no harm letting khubd
949 * see the wPortStatus values (they should all be 0 except
950 * for PORT_POWER anyway).
951 */
952
953 if (temp & PORT_CONNECT) {
954 status |= USB_PORT_STAT_CONNECTION;
955 // status may be from integrated TT
956 if (ehci->has_hostpc) {
957 temp1 = ehci_readl(ehci, hostpc_reg);
958 status |= ehci_port_speed(ehci, temp1);
959 } else
960 status |= ehci_port_speed(ehci, temp);
961 }
962 if (temp & PORT_PE)
963 status |= USB_PORT_STAT_ENABLE;
964
965 /* maybe the port was unsuspended without our knowledge */
966 if (temp & (PORT_SUSPEND|PORT_RESUME)) {
967 status |= USB_PORT_STAT_SUSPEND;
968 } else if (test_bit(wIndex, &ehci->suspended_ports)) {
969 clear_bit(wIndex, &ehci->suspended_ports);
970 ehci->reset_done[wIndex] = 0;
971 if (temp & PORT_PE)
972 set_bit(wIndex, &ehci->port_c_suspend);
973 }
974
975 if (temp & PORT_OC)
976 status |= USB_PORT_STAT_OVERCURRENT;
977 if (temp & PORT_RESET)
978 status |= USB_PORT_STAT_RESET;
979 if (temp & PORT_POWER)
980 status |= USB_PORT_STAT_POWER;
981 if (test_bit(wIndex, &ehci->port_c_suspend))
982 status |= USB_PORT_STAT_C_SUSPEND << 16;
983
984 #ifndef VERBOSE_DEBUG
985 if (status & ~0xffff) /* only if wPortChange is interesting */
986 #endif
987 dbg_port (ehci, "GetStatus", wIndex + 1, temp);
988 put_unaligned_le32(status, buf);
989 break;
990 case SetHubFeature:
991 switch (wValue) {
992 case C_HUB_LOCAL_POWER:
993 case C_HUB_OVER_CURRENT:
994 /* no hub-wide feature/status flags */
995 break;
996 default:
997 goto error;
998 }
999 break;
1000 case SetPortFeature:
1001 selector = wIndex >> 8;
1002 wIndex &= 0xff;
1003 if (unlikely(ehci->debug)) {
1004 /* If the debug port is active any port
1005 * feature requests should get denied */
1006 if (wIndex == HCS_DEBUG_PORT(ehci->hcs_params) &&
1007 (readl(&ehci->debug->control) & DBGP_ENABLED)) {
1008 retval = -ENODEV;
1009 goto error_exit;
1010 }
1011 }
1012 if (!wIndex || wIndex > ports)
1013 goto error;
1014 wIndex--;
1015 temp = ehci_readl(ehci, status_reg);
1016 if (temp & PORT_OWNER)
1017 break;
1018
1019 temp &= ~PORT_RWC_BITS;
1020 switch (wValue) {
1021 case USB_PORT_FEAT_SUSPEND:
1022 if (ehci->no_selective_suspend)
1023 break;
1024 if ((temp & PORT_PE) == 0
1025 || (temp & PORT_RESET) != 0)
1026 goto error;
1027
1028 /* After above check the port must be connected.
1029 * Set appropriate bit thus could put phy into low power
1030 * mode if we have hostpc feature
1031 */
1032 temp &= ~PORT_WKCONN_E;
1033 temp |= PORT_WKDISC_E | PORT_WKOC_E;
1034 ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
1035 if (hostpc_reg) {
1036 spin_unlock_irqrestore(&ehci->lock, flags);
1037 msleep(5);/* 5ms for HCD enter low pwr mode */
1038 spin_lock_irqsave(&ehci->lock, flags);
1039 temp1 = ehci_readl(ehci, hostpc_reg);
1040 ehci_writel(ehci, temp1 | HOSTPC_PHCD,
1041 hostpc_reg);
1042 temp1 = ehci_readl(ehci, hostpc_reg);
1043 ehci_dbg(ehci, "Port%d phy low pwr mode %s\n",
1044 wIndex, (temp1 & HOSTPC_PHCD) ?
1045 "succeeded" : "failed");
1046 }
1047 set_bit(wIndex, &ehci->suspended_ports);
1048 break;
1049 case USB_PORT_FEAT_POWER:
1050 if (HCS_PPC (ehci->hcs_params))
1051 ehci_writel(ehci, temp | PORT_POWER,
1052 status_reg);
1053 break;
1054 case USB_PORT_FEAT_RESET:
1055 if (temp & PORT_RESUME)
1056 goto error;
1057 /* line status bits may report this as low speed,
1058 * which can be fine if this root hub has a
1059 * transaction translator built in.
1060 */
1061 if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
1062 && !ehci_is_TDI(ehci)
1063 && PORT_USB11 (temp)) {
1064 ehci_dbg (ehci,
1065 "port %d low speed --> companion\n",
1066 wIndex + 1);
1067 temp |= PORT_OWNER;
1068 } else {
1069 ehci_vdbg (ehci, "port %d reset\n", wIndex + 1);
1070 temp |= PORT_RESET;
1071 temp &= ~PORT_PE;
1072
1073 /*
1074 * caller must wait, then call GetPortStatus
1075 * usb 2.0 spec says 50 ms resets on root
1076 */
1077 ehci->reset_done [wIndex] = jiffies
1078 + msecs_to_jiffies (50);
1079 }
1080 ehci_writel(ehci, temp, status_reg);
1081 break;
1082
1083 /* For downstream facing ports (these): one hub port is put
1084 * into test mode according to USB2 11.24.2.13, then the hub
1085 * must be reset (which for root hub now means rmmod+modprobe,
1086 * or else system reboot). See EHCI 2.3.9 and 4.14 for info
1087 * about the EHCI-specific stuff.
1088 */
1089 case USB_PORT_FEAT_TEST:
1090 if (!selector || selector > 5)
1091 goto error;
1092 ehci_quiesce(ehci);
1093 ehci_halt(ehci);
1094 temp |= selector << 16;
1095 ehci_writel(ehci, temp, status_reg);
1096 break;
1097
1098 default:
1099 goto error;
1100 }
1101 ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
1102 break;
1103
1104 default:
1105 error:
1106 /* "stall" on error */
1107 retval = -EPIPE;
1108 }
1109 error_exit:
1110 spin_unlock_irqrestore (&ehci->lock, flags);
1111 return retval;
1112 }
1113
1114 static void ehci_relinquish_port(struct usb_hcd *hcd, int portnum)
1115 {
1116 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
1117
1118 if (ehci_is_TDI(ehci))
1119 return;
1120 set_owner(ehci, --portnum, PORT_OWNER);
1121 }
1122
1123 static int ehci_port_handed_over(struct usb_hcd *hcd, int portnum)
1124 {
1125 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
1126 u32 __iomem *reg;
1127
1128 if (ehci_is_TDI(ehci))
1129 return 0;
1130 reg = &ehci->regs->port_status[portnum - 1];
1131 return ehci_readl(ehci, reg) & PORT_OWNER;
1132 }
Linux kernel - Deliverables
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