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[SCSI] Merge tag 'fcoe-02-19-13' into for-linus
[deliverable/linux.git] / drivers / usb / host / ehci-hub.c
1 /*
2 * Copyright (C) 2001-2004 by David Brownell
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the
6 * Free Software Foundation; either version 2 of the License, or (at your
7 * option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
11 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software Foundation,
16 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17 */
18
19 /* this file is part of ehci-hcd.c */
20
21 /*-------------------------------------------------------------------------*/
22
23 /*
24 * EHCI Root Hub ... the nonsharable stuff
25 *
26 * Registers don't need cpu_to_le32, that happens transparently
27 */
28
29 /*-------------------------------------------------------------------------*/
30 #include <linux/usb/otg.h>
31
32 #define PORT_WAKE_BITS (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
33
34 #ifdef CONFIG_PM
35
36 static int ehci_hub_control(
37 struct usb_hcd *hcd,
38 u16 typeReq,
39 u16 wValue,
40 u16 wIndex,
41 char *buf,
42 u16 wLength
43 );
44
45 /* After a power loss, ports that were owned by the companion must be
46 * reset so that the companion can still own them.
47 */
48 static void ehci_handover_companion_ports(struct ehci_hcd *ehci)
49 {
50 u32 __iomem *reg;
51 u32 status;
52 int port;
53 __le32 buf;
54 struct usb_hcd *hcd = ehci_to_hcd(ehci);
55
56 if (!ehci->owned_ports)
57 return;
58
59 /* Make sure the ports are powered */
60 port = HCS_N_PORTS(ehci->hcs_params);
61 while (port--) {
62 if (test_bit(port, &ehci->owned_ports)) {
63 reg = &ehci->regs->port_status[port];
64 status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
65 if (!(status & PORT_POWER)) {
66 status |= PORT_POWER;
67 ehci_writel(ehci, status, reg);
68 }
69 }
70 }
71
72 /* Give the connections some time to appear */
73 msleep(20);
74
75 spin_lock_irq(&ehci->lock);
76 port = HCS_N_PORTS(ehci->hcs_params);
77 while (port--) {
78 if (test_bit(port, &ehci->owned_ports)) {
79 reg = &ehci->regs->port_status[port];
80 status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
81
82 /* Port already owned by companion? */
83 if (status & PORT_OWNER)
84 clear_bit(port, &ehci->owned_ports);
85 else if (test_bit(port, &ehci->companion_ports))
86 ehci_writel(ehci, status & ~PORT_PE, reg);
87 else {
88 spin_unlock_irq(&ehci->lock);
89 ehci_hub_control(hcd, SetPortFeature,
90 USB_PORT_FEAT_RESET, port + 1,
91 NULL, 0);
92 spin_lock_irq(&ehci->lock);
93 }
94 }
95 }
96 spin_unlock_irq(&ehci->lock);
97
98 if (!ehci->owned_ports)
99 return;
100 msleep(90); /* Wait for resets to complete */
101
102 spin_lock_irq(&ehci->lock);
103 port = HCS_N_PORTS(ehci->hcs_params);
104 while (port--) {
105 if (test_bit(port, &ehci->owned_ports)) {
106 spin_unlock_irq(&ehci->lock);
107 ehci_hub_control(hcd, GetPortStatus,
108 0, port + 1,
109 (char *) &buf, sizeof(buf));
110 spin_lock_irq(&ehci->lock);
111
112 /* The companion should now own the port,
113 * but if something went wrong the port must not
114 * remain enabled.
115 */
116 reg = &ehci->regs->port_status[port];
117 status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
118 if (status & PORT_OWNER)
119 ehci_writel(ehci, status | PORT_CSC, reg);
120 else {
121 ehci_dbg(ehci, "failed handover port %d: %x\n",
122 port + 1, status);
123 ehci_writel(ehci, status & ~PORT_PE, reg);
124 }
125 }
126 }
127
128 ehci->owned_ports = 0;
129 spin_unlock_irq(&ehci->lock);
130 }
131
132 static int ehci_port_change(struct ehci_hcd *ehci)
133 {
134 int i = HCS_N_PORTS(ehci->hcs_params);
135
136 /* First check if the controller indicates a change event */
137
138 if (ehci_readl(ehci, &ehci->regs->status) & STS_PCD)
139 return 1;
140
141 /*
142 * Not all controllers appear to update this while going from D3 to D0,
143 * so check the individual port status registers as well
144 */
145
146 while (i--)
147 if (ehci_readl(ehci, &ehci->regs->port_status[i]) & PORT_CSC)
148 return 1;
149
150 return 0;
151 }
152
153 static void ehci_adjust_port_wakeup_flags(struct ehci_hcd *ehci,
154 bool suspending, bool do_wakeup)
155 {
156 int port;
157 u32 temp;
158
159 /* If remote wakeup is enabled for the root hub but disabled
160 * for the controller, we must adjust all the port wakeup flags
161 * when the controller is suspended or resumed. In all other
162 * cases they don't need to be changed.
163 */
164 if (!ehci_to_hcd(ehci)->self.root_hub->do_remote_wakeup || do_wakeup)
165 return;
166
167 spin_lock_irq(&ehci->lock);
168
169 /* clear phy low-power mode before changing wakeup flags */
170 if (ehci->has_hostpc) {
171 port = HCS_N_PORTS(ehci->hcs_params);
172 while (port--) {
173 u32 __iomem *hostpc_reg = &ehci->regs->hostpc[port];
174
175 temp = ehci_readl(ehci, hostpc_reg);
176 ehci_writel(ehci, temp & ~HOSTPC_PHCD, hostpc_reg);
177 }
178 spin_unlock_irq(&ehci->lock);
179 msleep(5);
180 spin_lock_irq(&ehci->lock);
181 }
182
183 port = HCS_N_PORTS(ehci->hcs_params);
184 while (port--) {
185 u32 __iomem *reg = &ehci->regs->port_status[port];
186 u32 t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
187 u32 t2 = t1 & ~PORT_WAKE_BITS;
188
189 /* If we are suspending the controller, clear the flags.
190 * If we are resuming the controller, set the wakeup flags.
191 */
192 if (!suspending) {
193 if (t1 & PORT_CONNECT)
194 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
195 else
196 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
197 }
198 ehci_vdbg(ehci, "port %d, %08x -> %08x\n",
199 port + 1, t1, t2);
200 ehci_writel(ehci, t2, reg);
201 }
202
203 /* enter phy low-power mode again */
204 if (ehci->has_hostpc) {
205 port = HCS_N_PORTS(ehci->hcs_params);
206 while (port--) {
207 u32 __iomem *hostpc_reg = &ehci->regs->hostpc[port];
208
209 temp = ehci_readl(ehci, hostpc_reg);
210 ehci_writel(ehci, temp | HOSTPC_PHCD, hostpc_reg);
211 }
212 }
213
214 /* Does the root hub have a port wakeup pending? */
215 if (!suspending && ehci_port_change(ehci))
216 usb_hcd_resume_root_hub(ehci_to_hcd(ehci));
217
218 spin_unlock_irq(&ehci->lock);
219 }
220
221 static int ehci_bus_suspend (struct usb_hcd *hcd)
222 {
223 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
224 int port;
225 int mask;
226 int changed;
227
228 ehci_dbg(ehci, "suspend root hub\n");
229
230 if (time_before (jiffies, ehci->next_statechange))
231 msleep(5);
232
233 /* stop the schedules */
234 ehci_quiesce(ehci);
235
236 spin_lock_irq (&ehci->lock);
237 if (ehci->rh_state < EHCI_RH_RUNNING)
238 goto done;
239
240 /* Once the controller is stopped, port resumes that are already
241 * in progress won't complete. Hence if remote wakeup is enabled
242 * for the root hub and any ports are in the middle of a resume or
243 * remote wakeup, we must fail the suspend.
244 */
245 if (hcd->self.root_hub->do_remote_wakeup) {
246 if (ehci->resuming_ports) {
247 spin_unlock_irq(&ehci->lock);
248 ehci_dbg(ehci, "suspend failed because a port is resuming\n");
249 return -EBUSY;
250 }
251 }
252
253 /* Unlike other USB host controller types, EHCI doesn't have
254 * any notion of "global" or bus-wide suspend. The driver has
255 * to manually suspend all the active unsuspended ports, and
256 * then manually resume them in the bus_resume() routine.
257 */
258 ehci->bus_suspended = 0;
259 ehci->owned_ports = 0;
260 changed = 0;
261 port = HCS_N_PORTS(ehci->hcs_params);
262 while (port--) {
263 u32 __iomem *reg = &ehci->regs->port_status [port];
264 u32 t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
265 u32 t2 = t1 & ~PORT_WAKE_BITS;
266
267 /* keep track of which ports we suspend */
268 if (t1 & PORT_OWNER)
269 set_bit(port, &ehci->owned_ports);
270 else if ((t1 & PORT_PE) && !(t1 & PORT_SUSPEND)) {
271 t2 |= PORT_SUSPEND;
272 set_bit(port, &ehci->bus_suspended);
273 }
274
275 /* enable remote wakeup on all ports, if told to do so */
276 if (hcd->self.root_hub->do_remote_wakeup) {
277 /* only enable appropriate wake bits, otherwise the
278 * hardware can not go phy low power mode. If a race
279 * condition happens here(connection change during bits
280 * set), the port change detection will finally fix it.
281 */
282 if (t1 & PORT_CONNECT)
283 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
284 else
285 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
286 }
287
288 if (t1 != t2) {
289 ehci_vdbg (ehci, "port %d, %08x -> %08x\n",
290 port + 1, t1, t2);
291 ehci_writel(ehci, t2, reg);
292 changed = 1;
293 }
294 }
295
296 if (changed && ehci->has_hostpc) {
297 spin_unlock_irq(&ehci->lock);
298 msleep(5); /* 5 ms for HCD to enter low-power mode */
299 spin_lock_irq(&ehci->lock);
300
301 port = HCS_N_PORTS(ehci->hcs_params);
302 while (port--) {
303 u32 __iomem *hostpc_reg = &ehci->regs->hostpc[port];
304 u32 t3;
305
306 t3 = ehci_readl(ehci, hostpc_reg);
307 ehci_writel(ehci, t3 | HOSTPC_PHCD, hostpc_reg);
308 t3 = ehci_readl(ehci, hostpc_reg);
309 ehci_dbg(ehci, "Port %d phy low-power mode %s\n",
310 port, (t3 & HOSTPC_PHCD) ?
311 "succeeded" : "failed");
312 }
313 }
314 spin_unlock_irq(&ehci->lock);
315
316 /* Apparently some devices need a >= 1-uframe delay here */
317 if (ehci->bus_suspended)
318 udelay(150);
319
320 /* turn off now-idle HC */
321 ehci_halt (ehci);
322
323 spin_lock_irq(&ehci->lock);
324 if (ehci->enabled_hrtimer_events & BIT(EHCI_HRTIMER_POLL_DEAD))
325 ehci_handle_controller_death(ehci);
326 if (ehci->rh_state != EHCI_RH_RUNNING)
327 goto done;
328 ehci->rh_state = EHCI_RH_SUSPENDED;
329
330 end_unlink_async(ehci);
331 unlink_empty_async(ehci);
332 ehci_handle_intr_unlinks(ehci);
333 end_free_itds(ehci);
334
335 /* allow remote wakeup */
336 mask = INTR_MASK;
337 if (!hcd->self.root_hub->do_remote_wakeup)
338 mask &= ~STS_PCD;
339 ehci_writel(ehci, mask, &ehci->regs->intr_enable);
340 ehci_readl(ehci, &ehci->regs->intr_enable);
341
342 done:
343 ehci->next_statechange = jiffies + msecs_to_jiffies(10);
344 ehci->enabled_hrtimer_events = 0;
345 ehci->next_hrtimer_event = EHCI_HRTIMER_NO_EVENT;
346 spin_unlock_irq (&ehci->lock);
347
348 hrtimer_cancel(&ehci->hrtimer);
349 return 0;
350 }
351
352
353 /* caller has locked the root hub, and should reset/reinit on error */
354 static int ehci_bus_resume (struct usb_hcd *hcd)
355 {
356 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
357 u32 temp;
358 u32 power_okay;
359 int i;
360 unsigned long resume_needed = 0;
361
362 if (time_before (jiffies, ehci->next_statechange))
363 msleep(5);
364 spin_lock_irq (&ehci->lock);
365 if (!HCD_HW_ACCESSIBLE(hcd) || ehci->shutdown)
366 goto shutdown;
367
368 if (unlikely(ehci->debug)) {
369 if (!dbgp_reset_prep(hcd))
370 ehci->debug = NULL;
371 else
372 dbgp_external_startup(hcd);
373 }
374
375 /* Ideally and we've got a real resume here, and no port's power
376 * was lost. (For PCI, that means Vaux was maintained.) But we
377 * could instead be restoring a swsusp snapshot -- so that BIOS was
378 * the last user of the controller, not reset/pm hardware keeping
379 * state we gave to it.
380 */
381 power_okay = ehci_readl(ehci, &ehci->regs->intr_enable);
382 ehci_dbg(ehci, "resume root hub%s\n",
383 power_okay ? "" : " after power loss");
384
385 /* at least some APM implementations will try to deliver
386 * IRQs right away, so delay them until we're ready.
387 */
388 ehci_writel(ehci, 0, &ehci->regs->intr_enable);
389
390 /* re-init operational registers */
391 ehci_writel(ehci, 0, &ehci->regs->segment);
392 ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
393 ehci_writel(ehci, (u32) ehci->async->qh_dma, &ehci->regs->async_next);
394
395 /* restore CMD_RUN, framelist size, and irq threshold */
396 ehci->command |= CMD_RUN;
397 ehci_writel(ehci, ehci->command, &ehci->regs->command);
398 ehci->rh_state = EHCI_RH_RUNNING;
399
400 /*
401 * According to Bugzilla #8190, the port status for some controllers
402 * will be wrong without a delay. At their wrong status, the port
403 * is enabled, but not suspended neither resumed.
404 */
405 i = HCS_N_PORTS(ehci->hcs_params);
406 while (i--) {
407 temp = ehci_readl(ehci, &ehci->regs->port_status[i]);
408 if ((temp & PORT_PE) &&
409 !(temp & (PORT_SUSPEND | PORT_RESUME))) {
410 ehci_dbg(ehci, "Port status(0x%x) is wrong\n", temp);
411 spin_unlock_irq(&ehci->lock);
412 msleep(8);
413 spin_lock_irq(&ehci->lock);
414 break;
415 }
416 }
417
418 if (ehci->shutdown)
419 goto shutdown;
420
421 /* clear phy low-power mode before resume */
422 if (ehci->bus_suspended && ehci->has_hostpc) {
423 i = HCS_N_PORTS(ehci->hcs_params);
424 while (i--) {
425 if (test_bit(i, &ehci->bus_suspended)) {
426 u32 __iomem *hostpc_reg =
427 &ehci->regs->hostpc[i];
428
429 temp = ehci_readl(ehci, hostpc_reg);
430 ehci_writel(ehci, temp & ~HOSTPC_PHCD,
431 hostpc_reg);
432 }
433 }
434 spin_unlock_irq(&ehci->lock);
435 msleep(5);
436 spin_lock_irq(&ehci->lock);
437 if (ehci->shutdown)
438 goto shutdown;
439 }
440
441 /* manually resume the ports we suspended during bus_suspend() */
442 i = HCS_N_PORTS (ehci->hcs_params);
443 while (i--) {
444 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
445 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
446 if (test_bit(i, &ehci->bus_suspended) &&
447 (temp & PORT_SUSPEND)) {
448 temp |= PORT_RESUME;
449 set_bit(i, &resume_needed);
450 }
451 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
452 }
453
454 /* msleep for 20ms only if code is trying to resume port */
455 if (resume_needed) {
456 spin_unlock_irq(&ehci->lock);
457 msleep(20);
458 spin_lock_irq(&ehci->lock);
459 if (ehci->shutdown)
460 goto shutdown;
461 }
462
463 i = HCS_N_PORTS (ehci->hcs_params);
464 while (i--) {
465 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
466 if (test_bit(i, &resume_needed)) {
467 temp &= ~(PORT_RWC_BITS | PORT_RESUME);
468 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
469 ehci_vdbg (ehci, "resumed port %d\n", i + 1);
470 }
471 }
472
473 ehci->next_statechange = jiffies + msecs_to_jiffies(5);
474 spin_unlock_irq(&ehci->lock);
475
476 ehci_handover_companion_ports(ehci);
477
478 /* Now we can safely re-enable irqs */
479 spin_lock_irq(&ehci->lock);
480 if (ehci->shutdown)
481 goto shutdown;
482 ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
483 (void) ehci_readl(ehci, &ehci->regs->intr_enable);
484 spin_unlock_irq(&ehci->lock);
485
486 return 0;
487
488 shutdown:
489 spin_unlock_irq(&ehci->lock);
490 return -ESHUTDOWN;
491 }
492
493 #else
494
495 #define ehci_bus_suspend NULL
496 #define ehci_bus_resume NULL
497
498 #endif /* CONFIG_PM */
499
500 /*-------------------------------------------------------------------------*/
501
502 /*
503 * Sets the owner of a port
504 */
505 static void set_owner(struct ehci_hcd *ehci, int portnum, int new_owner)
506 {
507 u32 __iomem *status_reg;
508 u32 port_status;
509 int try;
510
511 status_reg = &ehci->regs->port_status[portnum];
512
513 /*
514 * The controller won't set the OWNER bit if the port is
515 * enabled, so this loop will sometimes require at least two
516 * iterations: one to disable the port and one to set OWNER.
517 */
518 for (try = 4; try > 0; --try) {
519 spin_lock_irq(&ehci->lock);
520 port_status = ehci_readl(ehci, status_reg);
521 if ((port_status & PORT_OWNER) == new_owner
522 || (port_status & (PORT_OWNER | PORT_CONNECT))
523 == 0)
524 try = 0;
525 else {
526 port_status ^= PORT_OWNER;
527 port_status &= ~(PORT_PE | PORT_RWC_BITS);
528 ehci_writel(ehci, port_status, status_reg);
529 }
530 spin_unlock_irq(&ehci->lock);
531 if (try > 1)
532 msleep(5);
533 }
534 }
535
536 /*-------------------------------------------------------------------------*/
537
538 static int check_reset_complete (
539 struct ehci_hcd *ehci,
540 int index,
541 u32 __iomem *status_reg,
542 int port_status
543 ) {
544 if (!(port_status & PORT_CONNECT))
545 return port_status;
546
547 /* if reset finished and it's still not enabled -- handoff */
548 if (!(port_status & PORT_PE)) {
549
550 /* with integrated TT, there's nobody to hand it to! */
551 if (ehci_is_TDI(ehci)) {
552 ehci_dbg (ehci,
553 "Failed to enable port %d on root hub TT\n",
554 index+1);
555 return port_status;
556 }
557
558 ehci_dbg (ehci, "port %d full speed --> companion\n",
559 index + 1);
560
561 // what happens if HCS_N_CC(params) == 0 ?
562 port_status |= PORT_OWNER;
563 port_status &= ~PORT_RWC_BITS;
564 ehci_writel(ehci, port_status, status_reg);
565
566 /* ensure 440EPX ohci controller state is operational */
567 if (ehci->has_amcc_usb23)
568 set_ohci_hcfs(ehci, 1);
569 } else {
570 ehci_dbg(ehci, "port %d reset complete, port enabled\n",
571 index + 1);
572 /* ensure 440EPx ohci controller state is suspended */
573 if (ehci->has_amcc_usb23)
574 set_ohci_hcfs(ehci, 0);
575 }
576
577 return port_status;
578 }
579
580 /*-------------------------------------------------------------------------*/
581
582
583 /* build "status change" packet (one or two bytes) from HC registers */
584
585 static int
586 ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
587 {
588 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
589 u32 temp, status;
590 u32 mask;
591 int ports, i, retval = 1;
592 unsigned long flags;
593 u32 ppcd = 0;
594
595 /* init status to no-changes */
596 buf [0] = 0;
597 ports = HCS_N_PORTS (ehci->hcs_params);
598 if (ports > 7) {
599 buf [1] = 0;
600 retval++;
601 }
602
603 /* Inform the core about resumes-in-progress by returning
604 * a non-zero value even if there are no status changes.
605 */
606 status = ehci->resuming_ports;
607
608 /* Some boards (mostly VIA?) report bogus overcurrent indications,
609 * causing massive log spam unless we completely ignore them. It
610 * may be relevant that VIA VT8235 controllers, where PORT_POWER is
611 * always set, seem to clear PORT_OCC and PORT_CSC when writing to
612 * PORT_POWER; that's surprising, but maybe within-spec.
613 */
614 if (!ignore_oc)
615 mask = PORT_CSC | PORT_PEC | PORT_OCC;
616 else
617 mask = PORT_CSC | PORT_PEC;
618 // PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
619
620 /* no hub change reports (bit 0) for now (power, ...) */
621
622 /* port N changes (bit N)? */
623 spin_lock_irqsave (&ehci->lock, flags);
624
625 /* get per-port change detect bits */
626 if (ehci->has_ppcd)
627 ppcd = ehci_readl(ehci, &ehci->regs->status) >> 16;
628
629 for (i = 0; i < ports; i++) {
630 /* leverage per-port change bits feature */
631 if (ehci->has_ppcd && !(ppcd & (1 << i)))
632 continue;
633 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
634
635 /*
636 * Return status information even for ports with OWNER set.
637 * Otherwise khubd wouldn't see the disconnect event when a
638 * high-speed device is switched over to the companion
639 * controller by the user.
640 */
641
642 if ((temp & mask) != 0 || test_bit(i, &ehci->port_c_suspend)
643 || (ehci->reset_done[i] && time_after_eq(
644 jiffies, ehci->reset_done[i]))) {
645 if (i < 7)
646 buf [0] |= 1 << (i + 1);
647 else
648 buf [1] |= 1 << (i - 7);
649 status = STS_PCD;
650 }
651 }
652 /* FIXME autosuspend idle root hubs */
653 spin_unlock_irqrestore (&ehci->lock, flags);
654 return status ? retval : 0;
655 }
656
657 /*-------------------------------------------------------------------------*/
658
659 static void
660 ehci_hub_descriptor (
661 struct ehci_hcd *ehci,
662 struct usb_hub_descriptor *desc
663 ) {
664 int ports = HCS_N_PORTS (ehci->hcs_params);
665 u16 temp;
666
667 desc->bDescriptorType = 0x29;
668 desc->bPwrOn2PwrGood = 10; /* ehci 1.0, 2.3.9 says 20ms max */
669 desc->bHubContrCurrent = 0;
670
671 desc->bNbrPorts = ports;
672 temp = 1 + (ports / 8);
673 desc->bDescLength = 7 + 2 * temp;
674
675 /* two bitmaps: ports removable, and usb 1.0 legacy PortPwrCtrlMask */
676 memset(&desc->u.hs.DeviceRemovable[0], 0, temp);
677 memset(&desc->u.hs.DeviceRemovable[temp], 0xff, temp);
678
679 temp = 0x0008; /* per-port overcurrent reporting */
680 if (HCS_PPC (ehci->hcs_params))
681 temp |= 0x0001; /* per-port power control */
682 else
683 temp |= 0x0002; /* no power switching */
684 #if 0
685 // re-enable when we support USB_PORT_FEAT_INDICATOR below.
686 if (HCS_INDICATOR (ehci->hcs_params))
687 temp |= 0x0080; /* per-port indicators (LEDs) */
688 #endif
689 desc->wHubCharacteristics = cpu_to_le16(temp);
690 }
691
692 /*-------------------------------------------------------------------------*/
693
694 static int ehci_hub_control (
695 struct usb_hcd *hcd,
696 u16 typeReq,
697 u16 wValue,
698 u16 wIndex,
699 char *buf,
700 u16 wLength
701 ) {
702 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
703 int ports = HCS_N_PORTS (ehci->hcs_params);
704 u32 __iomem *status_reg = &ehci->regs->port_status[
705 (wIndex & 0xff) - 1];
706 u32 __iomem *hostpc_reg = &ehci->regs->hostpc[(wIndex & 0xff) - 1];
707 u32 temp, temp1, status;
708 unsigned long flags;
709 int retval = 0;
710 unsigned selector;
711
712 /*
713 * FIXME: support SetPortFeatures USB_PORT_FEAT_INDICATOR.
714 * HCS_INDICATOR may say we can change LEDs to off/amber/green.
715 * (track current state ourselves) ... blink for diagnostics,
716 * power, "this is the one", etc. EHCI spec supports this.
717 */
718
719 spin_lock_irqsave (&ehci->lock, flags);
720 switch (typeReq) {
721 case ClearHubFeature:
722 switch (wValue) {
723 case C_HUB_LOCAL_POWER:
724 case C_HUB_OVER_CURRENT:
725 /* no hub-wide feature/status flags */
726 break;
727 default:
728 goto error;
729 }
730 break;
731 case ClearPortFeature:
732 if (!wIndex || wIndex > ports)
733 goto error;
734 wIndex--;
735 temp = ehci_readl(ehci, status_reg);
736 temp &= ~PORT_RWC_BITS;
737
738 /*
739 * Even if OWNER is set, so the port is owned by the
740 * companion controller, khubd needs to be able to clear
741 * the port-change status bits (especially
742 * USB_PORT_STAT_C_CONNECTION).
743 */
744
745 switch (wValue) {
746 case USB_PORT_FEAT_ENABLE:
747 ehci_writel(ehci, temp & ~PORT_PE, status_reg);
748 break;
749 case USB_PORT_FEAT_C_ENABLE:
750 ehci_writel(ehci, temp | PORT_PEC, status_reg);
751 break;
752 case USB_PORT_FEAT_SUSPEND:
753 if (temp & PORT_RESET)
754 goto error;
755 if (ehci->no_selective_suspend)
756 break;
757 #ifdef CONFIG_USB_OTG
758 if ((hcd->self.otg_port == (wIndex + 1))
759 && hcd->self.b_hnp_enable) {
760 otg_start_hnp(hcd->phy->otg);
761 break;
762 }
763 #endif
764 if (!(temp & PORT_SUSPEND))
765 break;
766 if ((temp & PORT_PE) == 0)
767 goto error;
768
769 /* clear phy low-power mode before resume */
770 if (ehci->has_hostpc) {
771 temp1 = ehci_readl(ehci, hostpc_reg);
772 ehci_writel(ehci, temp1 & ~HOSTPC_PHCD,
773 hostpc_reg);
774 spin_unlock_irqrestore(&ehci->lock, flags);
775 msleep(5);/* wait to leave low-power mode */
776 spin_lock_irqsave(&ehci->lock, flags);
777 }
778 /* resume signaling for 20 msec */
779 temp &= ~PORT_WAKE_BITS;
780 ehci_writel(ehci, temp | PORT_RESUME, status_reg);
781 ehci->reset_done[wIndex] = jiffies
782 + msecs_to_jiffies(20);
783 break;
784 case USB_PORT_FEAT_C_SUSPEND:
785 clear_bit(wIndex, &ehci->port_c_suspend);
786 break;
787 case USB_PORT_FEAT_POWER:
788 if (HCS_PPC (ehci->hcs_params))
789 ehci_writel(ehci, temp & ~PORT_POWER,
790 status_reg);
791 break;
792 case USB_PORT_FEAT_C_CONNECTION:
793 ehci_writel(ehci, temp | PORT_CSC, status_reg);
794 break;
795 case USB_PORT_FEAT_C_OVER_CURRENT:
796 ehci_writel(ehci, temp | PORT_OCC, status_reg);
797 break;
798 case USB_PORT_FEAT_C_RESET:
799 /* GetPortStatus clears reset */
800 break;
801 default:
802 goto error;
803 }
804 ehci_readl(ehci, &ehci->regs->command); /* unblock posted write */
805 break;
806 case GetHubDescriptor:
807 ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
808 buf);
809 break;
810 case GetHubStatus:
811 /* no hub-wide feature/status flags */
812 memset (buf, 0, 4);
813 //cpu_to_le32s ((u32 *) buf);
814 break;
815 case GetPortStatus:
816 if (!wIndex || wIndex > ports)
817 goto error;
818 wIndex--;
819 status = 0;
820 temp = ehci_readl(ehci, status_reg);
821
822 // wPortChange bits
823 if (temp & PORT_CSC)
824 status |= USB_PORT_STAT_C_CONNECTION << 16;
825 if (temp & PORT_PEC)
826 status |= USB_PORT_STAT_C_ENABLE << 16;
827
828 if ((temp & PORT_OCC) && !ignore_oc){
829 status |= USB_PORT_STAT_C_OVERCURRENT << 16;
830
831 /*
832 * Hubs should disable port power on over-current.
833 * However, not all EHCI implementations do this
834 * automatically, even if they _do_ support per-port
835 * power switching; they're allowed to just limit the
836 * current. khubd will turn the power back on.
837 */
838 if ((temp & PORT_OC) && HCS_PPC(ehci->hcs_params)) {
839 ehci_writel(ehci,
840 temp & ~(PORT_RWC_BITS | PORT_POWER),
841 status_reg);
842 temp = ehci_readl(ehci, status_reg);
843 }
844 }
845
846 /* whoever resumes must GetPortStatus to complete it!! */
847 if (temp & PORT_RESUME) {
848
849 /* Remote Wakeup received? */
850 if (!ehci->reset_done[wIndex]) {
851 /* resume signaling for 20 msec */
852 ehci->reset_done[wIndex] = jiffies
853 + msecs_to_jiffies(20);
854 /* check the port again */
855 mod_timer(&ehci_to_hcd(ehci)->rh_timer,
856 ehci->reset_done[wIndex]);
857 }
858
859 /* resume completed? */
860 else if (time_after_eq(jiffies,
861 ehci->reset_done[wIndex])) {
862 clear_bit(wIndex, &ehci->suspended_ports);
863 set_bit(wIndex, &ehci->port_c_suspend);
864 ehci->reset_done[wIndex] = 0;
865
866 /* stop resume signaling */
867 temp = ehci_readl(ehci, status_reg);
868 ehci_writel(ehci,
869 temp & ~(PORT_RWC_BITS | PORT_RESUME),
870 status_reg);
871 clear_bit(wIndex, &ehci->resuming_ports);
872 retval = handshake(ehci, status_reg,
873 PORT_RESUME, 0, 2000 /* 2msec */);
874 if (retval != 0) {
875 ehci_err(ehci,
876 "port %d resume error %d\n",
877 wIndex + 1, retval);
878 goto error;
879 }
880 temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10));
881 }
882 }
883
884 /* whoever resets must GetPortStatus to complete it!! */
885 if ((temp & PORT_RESET)
886 && time_after_eq(jiffies,
887 ehci->reset_done[wIndex])) {
888 status |= USB_PORT_STAT_C_RESET << 16;
889 ehci->reset_done [wIndex] = 0;
890 clear_bit(wIndex, &ehci->resuming_ports);
891
892 /* force reset to complete */
893 ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESET),
894 status_reg);
895 /* REVISIT: some hardware needs 550+ usec to clear
896 * this bit; seems too long to spin routinely...
897 */
898 retval = handshake(ehci, status_reg,
899 PORT_RESET, 0, 1000);
900 if (retval != 0) {
901 ehci_err (ehci, "port %d reset error %d\n",
902 wIndex + 1, retval);
903 goto error;
904 }
905
906 /* see what we found out */
907 temp = check_reset_complete (ehci, wIndex, status_reg,
908 ehci_readl(ehci, status_reg));
909 }
910
911 if (!(temp & (PORT_RESUME|PORT_RESET))) {
912 ehci->reset_done[wIndex] = 0;
913 clear_bit(wIndex, &ehci->resuming_ports);
914 }
915
916 /* transfer dedicated ports to the companion hc */
917 if ((temp & PORT_CONNECT) &&
918 test_bit(wIndex, &ehci->companion_ports)) {
919 temp &= ~PORT_RWC_BITS;
920 temp |= PORT_OWNER;
921 ehci_writel(ehci, temp, status_reg);
922 ehci_dbg(ehci, "port %d --> companion\n", wIndex + 1);
923 temp = ehci_readl(ehci, status_reg);
924 }
925
926 /*
927 * Even if OWNER is set, there's no harm letting khubd
928 * see the wPortStatus values (they should all be 0 except
929 * for PORT_POWER anyway).
930 */
931
932 if (temp & PORT_CONNECT) {
933 status |= USB_PORT_STAT_CONNECTION;
934 // status may be from integrated TT
935 if (ehci->has_hostpc) {
936 temp1 = ehci_readl(ehci, hostpc_reg);
937 status |= ehci_port_speed(ehci, temp1);
938 } else
939 status |= ehci_port_speed(ehci, temp);
940 }
941 if (temp & PORT_PE)
942 status |= USB_PORT_STAT_ENABLE;
943
944 /* maybe the port was unsuspended without our knowledge */
945 if (temp & (PORT_SUSPEND|PORT_RESUME)) {
946 status |= USB_PORT_STAT_SUSPEND;
947 } else if (test_bit(wIndex, &ehci->suspended_ports)) {
948 clear_bit(wIndex, &ehci->suspended_ports);
949 clear_bit(wIndex, &ehci->resuming_ports);
950 ehci->reset_done[wIndex] = 0;
951 if (temp & PORT_PE)
952 set_bit(wIndex, &ehci->port_c_suspend);
953 }
954
955 if (temp & PORT_OC)
956 status |= USB_PORT_STAT_OVERCURRENT;
957 if (temp & PORT_RESET)
958 status |= USB_PORT_STAT_RESET;
959 if (temp & PORT_POWER)
960 status |= USB_PORT_STAT_POWER;
961 if (test_bit(wIndex, &ehci->port_c_suspend))
962 status |= USB_PORT_STAT_C_SUSPEND << 16;
963
964 #ifndef VERBOSE_DEBUG
965 if (status & ~0xffff) /* only if wPortChange is interesting */
966 #endif
967 dbg_port (ehci, "GetStatus", wIndex + 1, temp);
968 put_unaligned_le32(status, buf);
969 break;
970 case SetHubFeature:
971 switch (wValue) {
972 case C_HUB_LOCAL_POWER:
973 case C_HUB_OVER_CURRENT:
974 /* no hub-wide feature/status flags */
975 break;
976 default:
977 goto error;
978 }
979 break;
980 case SetPortFeature:
981 selector = wIndex >> 8;
982 wIndex &= 0xff;
983 if (unlikely(ehci->debug)) {
984 /* If the debug port is active any port
985 * feature requests should get denied */
986 if (wIndex == HCS_DEBUG_PORT(ehci->hcs_params) &&
987 (readl(&ehci->debug->control) & DBGP_ENABLED)) {
988 retval = -ENODEV;
989 goto error_exit;
990 }
991 }
992 if (!wIndex || wIndex > ports)
993 goto error;
994 wIndex--;
995 temp = ehci_readl(ehci, status_reg);
996 if (temp & PORT_OWNER)
997 break;
998
999 temp &= ~PORT_RWC_BITS;
1000 switch (wValue) {
1001 case USB_PORT_FEAT_SUSPEND:
1002 if (ehci->no_selective_suspend)
1003 break;
1004 if ((temp & PORT_PE) == 0
1005 || (temp & PORT_RESET) != 0)
1006 goto error;
1007
1008 /* After above check the port must be connected.
1009 * Set appropriate bit thus could put phy into low power
1010 * mode if we have hostpc feature
1011 */
1012 temp &= ~PORT_WKCONN_E;
1013 temp |= PORT_WKDISC_E | PORT_WKOC_E;
1014 ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
1015 if (ehci->has_hostpc) {
1016 spin_unlock_irqrestore(&ehci->lock, flags);
1017 msleep(5);/* 5ms for HCD enter low pwr mode */
1018 spin_lock_irqsave(&ehci->lock, flags);
1019 temp1 = ehci_readl(ehci, hostpc_reg);
1020 ehci_writel(ehci, temp1 | HOSTPC_PHCD,
1021 hostpc_reg);
1022 temp1 = ehci_readl(ehci, hostpc_reg);
1023 ehci_dbg(ehci, "Port%d phy low pwr mode %s\n",
1024 wIndex, (temp1 & HOSTPC_PHCD) ?
1025 "succeeded" : "failed");
1026 }
1027 set_bit(wIndex, &ehci->suspended_ports);
1028 break;
1029 case USB_PORT_FEAT_POWER:
1030 if (HCS_PPC (ehci->hcs_params))
1031 ehci_writel(ehci, temp | PORT_POWER,
1032 status_reg);
1033 break;
1034 case USB_PORT_FEAT_RESET:
1035 if (temp & PORT_RESUME)
1036 goto error;
1037 /* line status bits may report this as low speed,
1038 * which can be fine if this root hub has a
1039 * transaction translator built in.
1040 */
1041 if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
1042 && !ehci_is_TDI(ehci)
1043 && PORT_USB11 (temp)) {
1044 ehci_dbg (ehci,
1045 "port %d low speed --> companion\n",
1046 wIndex + 1);
1047 temp |= PORT_OWNER;
1048 } else {
1049 ehci_vdbg (ehci, "port %d reset\n", wIndex + 1);
1050 temp |= PORT_RESET;
1051 temp &= ~PORT_PE;
1052
1053 /*
1054 * caller must wait, then call GetPortStatus
1055 * usb 2.0 spec says 50 ms resets on root
1056 */
1057 ehci->reset_done [wIndex] = jiffies
1058 + msecs_to_jiffies (50);
1059 }
1060 ehci_writel(ehci, temp, status_reg);
1061 break;
1062
1063 /* For downstream facing ports (these): one hub port is put
1064 * into test mode according to USB2 11.24.2.13, then the hub
1065 * must be reset (which for root hub now means rmmod+modprobe,
1066 * or else system reboot). See EHCI 2.3.9 and 4.14 for info
1067 * about the EHCI-specific stuff.
1068 */
1069 case USB_PORT_FEAT_TEST:
1070 if (!selector || selector > 5)
1071 goto error;
1072 spin_unlock_irqrestore(&ehci->lock, flags);
1073 ehci_quiesce(ehci);
1074 spin_lock_irqsave(&ehci->lock, flags);
1075
1076 /* Put all enabled ports into suspend */
1077 while (ports--) {
1078 u32 __iomem *sreg =
1079 &ehci->regs->port_status[ports];
1080
1081 temp = ehci_readl(ehci, sreg) & ~PORT_RWC_BITS;
1082 if (temp & PORT_PE)
1083 ehci_writel(ehci, temp | PORT_SUSPEND,
1084 sreg);
1085 }
1086
1087 spin_unlock_irqrestore(&ehci->lock, flags);
1088 ehci_halt(ehci);
1089 spin_lock_irqsave(&ehci->lock, flags);
1090
1091 temp = ehci_readl(ehci, status_reg);
1092 temp |= selector << 16;
1093 ehci_writel(ehci, temp, status_reg);
1094 break;
1095
1096 default:
1097 goto error;
1098 }
1099 ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
1100 break;
1101
1102 default:
1103 error:
1104 /* "stall" on error */
1105 retval = -EPIPE;
1106 }
1107 error_exit:
1108 spin_unlock_irqrestore (&ehci->lock, flags);
1109 return retval;
1110 }
1111
1112 static void ehci_relinquish_port(struct usb_hcd *hcd, int portnum)
1113 {
1114 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
1115
1116 if (ehci_is_TDI(ehci))
1117 return;
1118 set_owner(ehci, --portnum, PORT_OWNER);
1119 }
1120
1121 static int ehci_port_handed_over(struct usb_hcd *hcd, int portnum)
1122 {
1123 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
1124 u32 __iomem *reg;
1125
1126 if (ehci_is_TDI(ehci))
1127 return 0;
1128 reg = &ehci->regs->port_status[portnum - 1];
1129 return ehci_readl(ehci, reg) & PORT_OWNER;
1130 }
Linux kernel - Deliverables
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