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Merge branch 'for-3.5/core' of git://git.kernel.dk/linux-block
[GitHub/mt8127/android_kernel_alcatel_ttab.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 /* Give the connections some time to appear */
60 msleep(20);
61
62 port = HCS_N_PORTS(ehci->hcs_params);
63 while (port--) {
64 if (test_bit(port, &ehci->owned_ports)) {
65 reg = &ehci->regs->port_status[port];
66 status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
67
68 /* Port already owned by companion? */
69 if (status & PORT_OWNER)
70 clear_bit(port, &ehci->owned_ports);
71 else if (test_bit(port, &ehci->companion_ports))
72 ehci_writel(ehci, status & ~PORT_PE, reg);
73 else
74 ehci_hub_control(hcd, SetPortFeature,
75 USB_PORT_FEAT_RESET, port + 1,
76 NULL, 0);
77 }
78 }
79
80 if (!ehci->owned_ports)
81 return;
82 msleep(90); /* Wait for resets to complete */
83
84 port = HCS_N_PORTS(ehci->hcs_params);
85 while (port--) {
86 if (test_bit(port, &ehci->owned_ports)) {
87 ehci_hub_control(hcd, GetPortStatus,
88 0, port + 1,
89 (char *) &buf, sizeof(buf));
90
91 /* The companion should now own the port,
92 * but if something went wrong the port must not
93 * remain enabled.
94 */
95 reg = &ehci->regs->port_status[port];
96 status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
97 if (status & PORT_OWNER)
98 ehci_writel(ehci, status | PORT_CSC, reg);
99 else {
100 ehci_dbg(ehci, "failed handover port %d: %x\n",
101 port + 1, status);
102 ehci_writel(ehci, status & ~PORT_PE, reg);
103 }
104 }
105 }
106
107 ehci->owned_ports = 0;
108 }
109
110 static int __maybe_unused ehci_port_change(struct ehci_hcd *ehci)
111 {
112 int i = HCS_N_PORTS(ehci->hcs_params);
113
114 /* First check if the controller indicates a change event */
115
116 if (ehci_readl(ehci, &ehci->regs->status) & STS_PCD)
117 return 1;
118
119 /*
120 * Not all controllers appear to update this while going from D3 to D0,
121 * so check the individual port status registers as well
122 */
123
124 while (i--)
125 if (ehci_readl(ehci, &ehci->regs->port_status[i]) & PORT_CSC)
126 return 1;
127
128 return 0;
129 }
130
131 static __maybe_unused void ehci_adjust_port_wakeup_flags(struct ehci_hcd *ehci,
132 bool suspending, bool do_wakeup)
133 {
134 int port;
135 u32 temp;
136 unsigned long flags;
137
138 /* If remote wakeup is enabled for the root hub but disabled
139 * for the controller, we must adjust all the port wakeup flags
140 * when the controller is suspended or resumed. In all other
141 * cases they don't need to be changed.
142 */
143 if (!ehci_to_hcd(ehci)->self.root_hub->do_remote_wakeup || do_wakeup)
144 return;
145
146 spin_lock_irqsave(&ehci->lock, flags);
147
148 /* clear phy low-power mode before changing wakeup flags */
149 if (ehci->has_hostpc) {
150 port = HCS_N_PORTS(ehci->hcs_params);
151 while (port--) {
152 u32 __iomem *hostpc_reg;
153
154 hostpc_reg = (u32 __iomem *)((u8 *) ehci->regs
155 + HOSTPC0 + 4 * port);
156 temp = ehci_readl(ehci, hostpc_reg);
157 ehci_writel(ehci, temp & ~HOSTPC_PHCD, hostpc_reg);
158 }
159 spin_unlock_irqrestore(&ehci->lock, flags);
160 msleep(5);
161 spin_lock_irqsave(&ehci->lock, flags);
162 }
163
164 port = HCS_N_PORTS(ehci->hcs_params);
165 while (port--) {
166 u32 __iomem *reg = &ehci->regs->port_status[port];
167 u32 t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
168 u32 t2 = t1 & ~PORT_WAKE_BITS;
169
170 /* If we are suspending the controller, clear the flags.
171 * If we are resuming the controller, set the wakeup flags.
172 */
173 if (!suspending) {
174 if (t1 & PORT_CONNECT)
175 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
176 else
177 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
178 }
179 ehci_vdbg(ehci, "port %d, %08x -> %08x\n",
180 port + 1, t1, t2);
181 ehci_writel(ehci, t2, reg);
182 }
183
184 /* enter phy low-power mode again */
185 if (ehci->has_hostpc) {
186 port = HCS_N_PORTS(ehci->hcs_params);
187 while (port--) {
188 u32 __iomem *hostpc_reg;
189
190 hostpc_reg = (u32 __iomem *)((u8 *) ehci->regs
191 + HOSTPC0 + 4 * port);
192 temp = ehci_readl(ehci, hostpc_reg);
193 ehci_writel(ehci, temp | HOSTPC_PHCD, hostpc_reg);
194 }
195 }
196
197 /* Does the root hub have a port wakeup pending? */
198 if (!suspending && ehci_port_change(ehci))
199 usb_hcd_resume_root_hub(ehci_to_hcd(ehci));
200
201 spin_unlock_irqrestore(&ehci->lock, flags);
202 }
203
204 static int ehci_bus_suspend (struct usb_hcd *hcd)
205 {
206 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
207 int port;
208 int mask;
209 int changed;
210
211 ehci_dbg(ehci, "suspend root hub\n");
212
213 if (time_before (jiffies, ehci->next_statechange))
214 msleep(5);
215 del_timer_sync(&ehci->watchdog);
216 del_timer_sync(&ehci->iaa_watchdog);
217
218 spin_lock_irq (&ehci->lock);
219
220 /* Once the controller is stopped, port resumes that are already
221 * in progress won't complete. Hence if remote wakeup is enabled
222 * for the root hub and any ports are in the middle of a resume or
223 * remote wakeup, we must fail the suspend.
224 */
225 if (hcd->self.root_hub->do_remote_wakeup) {
226 if (ehci->resuming_ports) {
227 spin_unlock_irq(&ehci->lock);
228 ehci_dbg(ehci, "suspend failed because a port is resuming\n");
229 return -EBUSY;
230 }
231 }
232
233 /* stop schedules, clean any completed work */
234 if (ehci->rh_state == EHCI_RH_RUNNING)
235 ehci_quiesce (ehci);
236 ehci_work(ehci);
237
238 /* Unlike other USB host controller types, EHCI doesn't have
239 * any notion of "global" or bus-wide suspend. The driver has
240 * to manually suspend all the active unsuspended ports, and
241 * then manually resume them in the bus_resume() routine.
242 */
243 ehci->bus_suspended = 0;
244 ehci->owned_ports = 0;
245 changed = 0;
246 port = HCS_N_PORTS(ehci->hcs_params);
247 while (port--) {
248 u32 __iomem *reg = &ehci->regs->port_status [port];
249 u32 t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
250 u32 t2 = t1 & ~PORT_WAKE_BITS;
251
252 /* keep track of which ports we suspend */
253 if (t1 & PORT_OWNER)
254 set_bit(port, &ehci->owned_ports);
255 else if ((t1 & PORT_PE) && !(t1 & PORT_SUSPEND)) {
256 t2 |= PORT_SUSPEND;
257 set_bit(port, &ehci->bus_suspended);
258 }
259
260 /* enable remote wakeup on all ports, if told to do so */
261 if (hcd->self.root_hub->do_remote_wakeup) {
262 /* only enable appropriate wake bits, otherwise the
263 * hardware can not go phy low power mode. If a race
264 * condition happens here(connection change during bits
265 * set), the port change detection will finally fix it.
266 */
267 if (t1 & PORT_CONNECT)
268 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
269 else
270 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
271 }
272
273 if (t1 != t2) {
274 ehci_vdbg (ehci, "port %d, %08x -> %08x\n",
275 port + 1, t1, t2);
276 ehci_writel(ehci, t2, reg);
277 changed = 1;
278 }
279 }
280
281 if (changed && ehci->has_hostpc) {
282 spin_unlock_irq(&ehci->lock);
283 msleep(5); /* 5 ms for HCD to enter low-power mode */
284 spin_lock_irq(&ehci->lock);
285
286 port = HCS_N_PORTS(ehci->hcs_params);
287 while (port--) {
288 u32 __iomem *hostpc_reg;
289 u32 t3;
290
291 hostpc_reg = (u32 __iomem *)((u8 *) ehci->regs
292 + HOSTPC0 + 4 * port);
293 t3 = ehci_readl(ehci, hostpc_reg);
294 ehci_writel(ehci, t3 | HOSTPC_PHCD, hostpc_reg);
295 t3 = ehci_readl(ehci, hostpc_reg);
296 ehci_dbg(ehci, "Port %d phy low-power mode %s\n",
297 port, (t3 & HOSTPC_PHCD) ?
298 "succeeded" : "failed");
299 }
300 }
301
302 /* Apparently some devices need a >= 1-uframe delay here */
303 if (ehci->bus_suspended)
304 udelay(150);
305
306 /* turn off now-idle HC */
307 ehci_halt (ehci);
308 ehci->rh_state = EHCI_RH_SUSPENDED;
309
310 if (ehci->reclaim)
311 end_unlink_async(ehci);
312
313 /* allow remote wakeup */
314 mask = INTR_MASK;
315 if (!hcd->self.root_hub->do_remote_wakeup)
316 mask &= ~STS_PCD;
317 ehci_writel(ehci, mask, &ehci->regs->intr_enable);
318 ehci_readl(ehci, &ehci->regs->intr_enable);
319
320 ehci->next_statechange = jiffies + msecs_to_jiffies(10);
321 spin_unlock_irq (&ehci->lock);
322
323 /* ehci_work() may have re-enabled the watchdog timer, which we do not
324 * want, and so we must delete any pending watchdog timer events.
325 */
326 del_timer_sync(&ehci->watchdog);
327 return 0;
328 }
329
330
331 /* caller has locked the root hub, and should reset/reinit on error */
332 static int ehci_bus_resume (struct usb_hcd *hcd)
333 {
334 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
335 u32 temp;
336 u32 power_okay;
337 int i;
338 unsigned long resume_needed = 0;
339
340 if (time_before (jiffies, ehci->next_statechange))
341 msleep(5);
342 spin_lock_irq (&ehci->lock);
343 if (!HCD_HW_ACCESSIBLE(hcd)) {
344 spin_unlock_irq(&ehci->lock);
345 return -ESHUTDOWN;
346 }
347
348 if (unlikely(ehci->debug)) {
349 if (!dbgp_reset_prep())
350 ehci->debug = NULL;
351 else
352 dbgp_external_startup();
353 }
354
355 /* Ideally and we've got a real resume here, and no port's power
356 * was lost. (For PCI, that means Vaux was maintained.) But we
357 * could instead be restoring a swsusp snapshot -- so that BIOS was
358 * the last user of the controller, not reset/pm hardware keeping
359 * state we gave to it.
360 */
361 power_okay = ehci_readl(ehci, &ehci->regs->intr_enable);
362 ehci_dbg(ehci, "resume root hub%s\n",
363 power_okay ? "" : " after power loss");
364
365 /* at least some APM implementations will try to deliver
366 * IRQs right away, so delay them until we're ready.
367 */
368 ehci_writel(ehci, 0, &ehci->regs->intr_enable);
369
370 /* re-init operational registers */
371 ehci_writel(ehci, 0, &ehci->regs->segment);
372 ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
373 ehci_writel(ehci, (u32) ehci->async->qh_dma, &ehci->regs->async_next);
374
375 /* restore CMD_RUN, framelist size, and irq threshold */
376 ehci->command |= CMD_RUN;
377 ehci_writel(ehci, ehci->command, &ehci->regs->command);
378 ehci->rh_state = EHCI_RH_RUNNING;
379
380 /* Some controller/firmware combinations need a delay during which
381 * they set up the port statuses. See Bugzilla #8190. */
382 spin_unlock_irq(&ehci->lock);
383 msleep(8);
384 spin_lock_irq(&ehci->lock);
385
386 /* clear phy low-power mode before resume */
387 if (ehci->bus_suspended && ehci->has_hostpc) {
388 i = HCS_N_PORTS(ehci->hcs_params);
389 while (i--) {
390 if (test_bit(i, &ehci->bus_suspended)) {
391 u32 __iomem *hostpc_reg;
392
393 hostpc_reg = (u32 __iomem *)((u8 *) ehci->regs
394 + HOSTPC0 + 4 * i);
395 temp = ehci_readl(ehci, hostpc_reg);
396 ehci_writel(ehci, temp & ~HOSTPC_PHCD,
397 hostpc_reg);
398 }
399 }
400 spin_unlock_irq(&ehci->lock);
401 msleep(5);
402 spin_lock_irq(&ehci->lock);
403 }
404
405 /* manually resume the ports we suspended during bus_suspend() */
406 i = HCS_N_PORTS (ehci->hcs_params);
407 while (i--) {
408 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
409 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
410 if (test_bit(i, &ehci->bus_suspended) &&
411 (temp & PORT_SUSPEND)) {
412 temp |= PORT_RESUME;
413 set_bit(i, &resume_needed);
414 }
415 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
416 }
417
418 /* msleep for 20ms only if code is trying to resume port */
419 if (resume_needed) {
420 spin_unlock_irq(&ehci->lock);
421 msleep(20);
422 spin_lock_irq(&ehci->lock);
423 }
424
425 i = HCS_N_PORTS (ehci->hcs_params);
426 while (i--) {
427 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
428 if (test_bit(i, &resume_needed)) {
429 temp &= ~(PORT_RWC_BITS | PORT_RESUME);
430 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
431 ehci_vdbg (ehci, "resumed port %d\n", i + 1);
432 }
433 }
434 (void) ehci_readl(ehci, &ehci->regs->command);
435
436 /* maybe re-activate the schedule(s) */
437 temp = 0;
438 if (ehci->async->qh_next.qh)
439 temp |= CMD_ASE;
440 if (ehci->periodic_sched)
441 temp |= CMD_PSE;
442 if (temp) {
443 ehci->command |= temp;
444 ehci_writel(ehci, ehci->command, &ehci->regs->command);
445 }
446
447 ehci->next_statechange = jiffies + msecs_to_jiffies(5);
448
449 /* Now we can safely re-enable irqs */
450 ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
451
452 spin_unlock_irq (&ehci->lock);
453 ehci_handover_companion_ports(ehci);
454 return 0;
455 }
456
457 #else
458
459 #define ehci_bus_suspend NULL
460 #define ehci_bus_resume NULL
461
462 #endif /* CONFIG_PM */
463
464 /*-------------------------------------------------------------------------*/
465
466 /*
467 * Sets the owner of a port
468 */
469 static void set_owner(struct ehci_hcd *ehci, int portnum, int new_owner)
470 {
471 u32 __iomem *status_reg;
472 u32 port_status;
473 int try;
474
475 status_reg = &ehci->regs->port_status[portnum];
476
477 /*
478 * The controller won't set the OWNER bit if the port is
479 * enabled, so this loop will sometimes require at least two
480 * iterations: one to disable the port and one to set OWNER.
481 */
482 for (try = 4; try > 0; --try) {
483 spin_lock_irq(&ehci->lock);
484 port_status = ehci_readl(ehci, status_reg);
485 if ((port_status & PORT_OWNER) == new_owner
486 || (port_status & (PORT_OWNER | PORT_CONNECT))
487 == 0)
488 try = 0;
489 else {
490 port_status ^= PORT_OWNER;
491 port_status &= ~(PORT_PE | PORT_RWC_BITS);
492 ehci_writel(ehci, port_status, status_reg);
493 }
494 spin_unlock_irq(&ehci->lock);
495 if (try > 1)
496 msleep(5);
497 }
498 }
499
500 /*-------------------------------------------------------------------------*/
501
502 static int check_reset_complete (
503 struct ehci_hcd *ehci,
504 int index,
505 u32 __iomem *status_reg,
506 int port_status
507 ) {
508 if (!(port_status & PORT_CONNECT))
509 return port_status;
510
511 /* if reset finished and it's still not enabled -- handoff */
512 if (!(port_status & PORT_PE)) {
513
514 /* with integrated TT, there's nobody to hand it to! */
515 if (ehci_is_TDI(ehci)) {
516 ehci_dbg (ehci,
517 "Failed to enable port %d on root hub TT\n",
518 index+1);
519 return port_status;
520 }
521
522 ehci_dbg (ehci, "port %d full speed --> companion\n",
523 index + 1);
524
525 // what happens if HCS_N_CC(params) == 0 ?
526 port_status |= PORT_OWNER;
527 port_status &= ~PORT_RWC_BITS;
528 ehci_writel(ehci, port_status, status_reg);
529
530 /* ensure 440EPX ohci controller state is operational */
531 if (ehci->has_amcc_usb23)
532 set_ohci_hcfs(ehci, 1);
533 } else {
534 ehci_dbg(ehci, "port %d reset complete, port enabled\n",
535 index + 1);
536 /* ensure 440EPx ohci controller state is suspended */
537 if (ehci->has_amcc_usb23)
538 set_ohci_hcfs(ehci, 0);
539 }
540
541 return port_status;
542 }
543
544 /*-------------------------------------------------------------------------*/
545
546
547 /* build "status change" packet (one or two bytes) from HC registers */
548
549 static int
550 ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
551 {
552 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
553 u32 temp, status;
554 u32 mask;
555 int ports, i, retval = 1;
556 unsigned long flags;
557 u32 ppcd = 0;
558
559 /* init status to no-changes */
560 buf [0] = 0;
561 ports = HCS_N_PORTS (ehci->hcs_params);
562 if (ports > 7) {
563 buf [1] = 0;
564 retval++;
565 }
566
567 /* Inform the core about resumes-in-progress by returning
568 * a non-zero value even if there are no status changes.
569 */
570 status = ehci->resuming_ports;
571
572 /* Some boards (mostly VIA?) report bogus overcurrent indications,
573 * causing massive log spam unless we completely ignore them. It
574 * may be relevant that VIA VT8235 controllers, where PORT_POWER is
575 * always set, seem to clear PORT_OCC and PORT_CSC when writing to
576 * PORT_POWER; that's surprising, but maybe within-spec.
577 */
578 if (!ignore_oc)
579 mask = PORT_CSC | PORT_PEC | PORT_OCC;
580 else
581 mask = PORT_CSC | PORT_PEC;
582 // PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
583
584 /* no hub change reports (bit 0) for now (power, ...) */
585
586 /* port N changes (bit N)? */
587 spin_lock_irqsave (&ehci->lock, flags);
588
589 /* get per-port change detect bits */
590 if (ehci->has_ppcd)
591 ppcd = ehci_readl(ehci, &ehci->regs->status) >> 16;
592
593 for (i = 0; i < ports; i++) {
594 /* leverage per-port change bits feature */
595 if (ehci->has_ppcd && !(ppcd & (1 << i)))
596 continue;
597 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
598
599 /*
600 * Return status information even for ports with OWNER set.
601 * Otherwise khubd wouldn't see the disconnect event when a
602 * high-speed device is switched over to the companion
603 * controller by the user.
604 */
605
606 if ((temp & mask) != 0 || test_bit(i, &ehci->port_c_suspend)
607 || (ehci->reset_done[i] && time_after_eq(
608 jiffies, ehci->reset_done[i]))) {
609 if (i < 7)
610 buf [0] |= 1 << (i + 1);
611 else
612 buf [1] |= 1 << (i - 7);
613 status = STS_PCD;
614 }
615 }
616 /* FIXME autosuspend idle root hubs */
617 spin_unlock_irqrestore (&ehci->lock, flags);
618 return status ? retval : 0;
619 }
620
621 /*-------------------------------------------------------------------------*/
622
623 static void
624 ehci_hub_descriptor (
625 struct ehci_hcd *ehci,
626 struct usb_hub_descriptor *desc
627 ) {
628 int ports = HCS_N_PORTS (ehci->hcs_params);
629 u16 temp;
630
631 desc->bDescriptorType = 0x29;
632 desc->bPwrOn2PwrGood = 10; /* ehci 1.0, 2.3.9 says 20ms max */
633 desc->bHubContrCurrent = 0;
634
635 desc->bNbrPorts = ports;
636 temp = 1 + (ports / 8);
637 desc->bDescLength = 7 + 2 * temp;
638
639 /* two bitmaps: ports removable, and usb 1.0 legacy PortPwrCtrlMask */
640 memset(&desc->u.hs.DeviceRemovable[0], 0, temp);
641 memset(&desc->u.hs.DeviceRemovable[temp], 0xff, temp);
642
643 temp = 0x0008; /* per-port overcurrent reporting */
644 if (HCS_PPC (ehci->hcs_params))
645 temp |= 0x0001; /* per-port power control */
646 else
647 temp |= 0x0002; /* no power switching */
648 #if 0
649 // re-enable when we support USB_PORT_FEAT_INDICATOR below.
650 if (HCS_INDICATOR (ehci->hcs_params))
651 temp |= 0x0080; /* per-port indicators (LEDs) */
652 #endif
653 desc->wHubCharacteristics = cpu_to_le16(temp);
654 }
655
656 /*-------------------------------------------------------------------------*/
657
658 static int ehci_hub_control (
659 struct usb_hcd *hcd,
660 u16 typeReq,
661 u16 wValue,
662 u16 wIndex,
663 char *buf,
664 u16 wLength
665 ) {
666 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
667 int ports = HCS_N_PORTS (ehci->hcs_params);
668 u32 __iomem *status_reg = &ehci->regs->port_status[
669 (wIndex & 0xff) - 1];
670 u32 __iomem *hostpc_reg = NULL;
671 u32 temp, temp1, status;
672 unsigned long flags;
673 int retval = 0;
674 unsigned selector;
675
676 /*
677 * FIXME: support SetPortFeatures USB_PORT_FEAT_INDICATOR.
678 * HCS_INDICATOR may say we can change LEDs to off/amber/green.
679 * (track current state ourselves) ... blink for diagnostics,
680 * power, "this is the one", etc. EHCI spec supports this.
681 */
682
683 if (ehci->has_hostpc)
684 hostpc_reg = (u32 __iomem *)((u8 *)ehci->regs
685 + HOSTPC0 + 4 * ((wIndex & 0xff) - 1));
686 spin_lock_irqsave (&ehci->lock, flags);
687 switch (typeReq) {
688 case ClearHubFeature:
689 switch (wValue) {
690 case C_HUB_LOCAL_POWER:
691 case C_HUB_OVER_CURRENT:
692 /* no hub-wide feature/status flags */
693 break;
694 default:
695 goto error;
696 }
697 break;
698 case ClearPortFeature:
699 if (!wIndex || wIndex > ports)
700 goto error;
701 wIndex--;
702 temp = ehci_readl(ehci, status_reg);
703 temp &= ~PORT_RWC_BITS;
704
705 /*
706 * Even if OWNER is set, so the port is owned by the
707 * companion controller, khubd needs to be able to clear
708 * the port-change status bits (especially
709 * USB_PORT_STAT_C_CONNECTION).
710 */
711
712 switch (wValue) {
713 case USB_PORT_FEAT_ENABLE:
714 ehci_writel(ehci, temp & ~PORT_PE, status_reg);
715 break;
716 case USB_PORT_FEAT_C_ENABLE:
717 ehci_writel(ehci, temp | PORT_PEC, status_reg);
718 break;
719 case USB_PORT_FEAT_SUSPEND:
720 if (temp & PORT_RESET)
721 goto error;
722 if (ehci->no_selective_suspend)
723 break;
724 #ifdef CONFIG_USB_OTG
725 if ((hcd->self.otg_port == (wIndex + 1))
726 && hcd->self.b_hnp_enable) {
727 otg_start_hnp(ehci->transceiver->otg);
728 break;
729 }
730 #endif
731 if (!(temp & PORT_SUSPEND))
732 break;
733 if ((temp & PORT_PE) == 0)
734 goto error;
735
736 /* clear phy low-power mode before resume */
737 if (hostpc_reg) {
738 temp1 = ehci_readl(ehci, hostpc_reg);
739 ehci_writel(ehci, temp1 & ~HOSTPC_PHCD,
740 hostpc_reg);
741 spin_unlock_irqrestore(&ehci->lock, flags);
742 msleep(5);/* wait to leave low-power mode */
743 spin_lock_irqsave(&ehci->lock, flags);
744 }
745 /* resume signaling for 20 msec */
746 temp &= ~PORT_WAKE_BITS;
747 ehci_writel(ehci, temp | PORT_RESUME, status_reg);
748 ehci->reset_done[wIndex] = jiffies
749 + msecs_to_jiffies(20);
750 break;
751 case USB_PORT_FEAT_C_SUSPEND:
752 clear_bit(wIndex, &ehci->port_c_suspend);
753 break;
754 case USB_PORT_FEAT_POWER:
755 if (HCS_PPC (ehci->hcs_params))
756 ehci_writel(ehci, temp & ~PORT_POWER,
757 status_reg);
758 break;
759 case USB_PORT_FEAT_C_CONNECTION:
760 if (ehci->has_lpm) {
761 /* clear PORTSC bits on disconnect */
762 temp &= ~PORT_LPM;
763 temp &= ~PORT_DEV_ADDR;
764 }
765 ehci_writel(ehci, temp | PORT_CSC, status_reg);
766 break;
767 case USB_PORT_FEAT_C_OVER_CURRENT:
768 ehci_writel(ehci, temp | PORT_OCC, status_reg);
769 break;
770 case USB_PORT_FEAT_C_RESET:
771 /* GetPortStatus clears reset */
772 break;
773 default:
774 goto error;
775 }
776 ehci_readl(ehci, &ehci->regs->command); /* unblock posted write */
777 break;
778 case GetHubDescriptor:
779 ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
780 buf);
781 break;
782 case GetHubStatus:
783 /* no hub-wide feature/status flags */
784 memset (buf, 0, 4);
785 //cpu_to_le32s ((u32 *) buf);
786 break;
787 case GetPortStatus:
788 if (!wIndex || wIndex > ports)
789 goto error;
790 wIndex--;
791 status = 0;
792 temp = ehci_readl(ehci, status_reg);
793
794 // wPortChange bits
795 if (temp & PORT_CSC)
796 status |= USB_PORT_STAT_C_CONNECTION << 16;
797 if (temp & PORT_PEC)
798 status |= USB_PORT_STAT_C_ENABLE << 16;
799
800 if ((temp & PORT_OCC) && !ignore_oc){
801 status |= USB_PORT_STAT_C_OVERCURRENT << 16;
802
803 /*
804 * Hubs should disable port power on over-current.
805 * However, not all EHCI implementations do this
806 * automatically, even if they _do_ support per-port
807 * power switching; they're allowed to just limit the
808 * current. khubd will turn the power back on.
809 */
810 if ((temp & PORT_OC) && HCS_PPC(ehci->hcs_params)) {
811 ehci_writel(ehci,
812 temp & ~(PORT_RWC_BITS | PORT_POWER),
813 status_reg);
814 temp = ehci_readl(ehci, status_reg);
815 }
816 }
817
818 /* whoever resumes must GetPortStatus to complete it!! */
819 if (temp & PORT_RESUME) {
820
821 /* Remote Wakeup received? */
822 if (!ehci->reset_done[wIndex]) {
823 /* resume signaling for 20 msec */
824 ehci->reset_done[wIndex] = jiffies
825 + msecs_to_jiffies(20);
826 /* check the port again */
827 mod_timer(&ehci_to_hcd(ehci)->rh_timer,
828 ehci->reset_done[wIndex]);
829 }
830
831 /* resume completed? */
832 else if (time_after_eq(jiffies,
833 ehci->reset_done[wIndex])) {
834 clear_bit(wIndex, &ehci->suspended_ports);
835 set_bit(wIndex, &ehci->port_c_suspend);
836 ehci->reset_done[wIndex] = 0;
837
838 /* stop resume signaling */
839 temp = ehci_readl(ehci, status_reg);
840 ehci_writel(ehci,
841 temp & ~(PORT_RWC_BITS | PORT_RESUME),
842 status_reg);
843 clear_bit(wIndex, &ehci->resuming_ports);
844 retval = handshake(ehci, status_reg,
845 PORT_RESUME, 0, 2000 /* 2msec */);
846 if (retval != 0) {
847 ehci_err(ehci,
848 "port %d resume error %d\n",
849 wIndex + 1, retval);
850 goto error;
851 }
852 temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10));
853 }
854 }
855
856 /* whoever resets must GetPortStatus to complete it!! */
857 if ((temp & PORT_RESET)
858 && time_after_eq(jiffies,
859 ehci->reset_done[wIndex])) {
860 status |= USB_PORT_STAT_C_RESET << 16;
861 ehci->reset_done [wIndex] = 0;
862 clear_bit(wIndex, &ehci->resuming_ports);
863
864 /* force reset to complete */
865 ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESET),
866 status_reg);
867 /* REVISIT: some hardware needs 550+ usec to clear
868 * this bit; seems too long to spin routinely...
869 */
870 retval = handshake(ehci, status_reg,
871 PORT_RESET, 0, 1000);
872 if (retval != 0) {
873 ehci_err (ehci, "port %d reset error %d\n",
874 wIndex + 1, retval);
875 goto error;
876 }
877
878 /* see what we found out */
879 temp = check_reset_complete (ehci, wIndex, status_reg,
880 ehci_readl(ehci, status_reg));
881 }
882
883 if (!(temp & (PORT_RESUME|PORT_RESET))) {
884 ehci->reset_done[wIndex] = 0;
885 clear_bit(wIndex, &ehci->resuming_ports);
886 }
887
888 /* transfer dedicated ports to the companion hc */
889 if ((temp & PORT_CONNECT) &&
890 test_bit(wIndex, &ehci->companion_ports)) {
891 temp &= ~PORT_RWC_BITS;
892 temp |= PORT_OWNER;
893 ehci_writel(ehci, temp, status_reg);
894 ehci_dbg(ehci, "port %d --> companion\n", wIndex + 1);
895 temp = ehci_readl(ehci, status_reg);
896 }
897
898 /*
899 * Even if OWNER is set, there's no harm letting khubd
900 * see the wPortStatus values (they should all be 0 except
901 * for PORT_POWER anyway).
902 */
903
904 if (temp & PORT_CONNECT) {
905 status |= USB_PORT_STAT_CONNECTION;
906 // status may be from integrated TT
907 if (ehci->has_hostpc) {
908 temp1 = ehci_readl(ehci, hostpc_reg);
909 status |= ehci_port_speed(ehci, temp1);
910 } else
911 status |= ehci_port_speed(ehci, temp);
912 }
913 if (temp & PORT_PE)
914 status |= USB_PORT_STAT_ENABLE;
915
916 /* maybe the port was unsuspended without our knowledge */
917 if (temp & (PORT_SUSPEND|PORT_RESUME)) {
918 status |= USB_PORT_STAT_SUSPEND;
919 } else if (test_bit(wIndex, &ehci->suspended_ports)) {
920 clear_bit(wIndex, &ehci->suspended_ports);
921 clear_bit(wIndex, &ehci->resuming_ports);
922 ehci->reset_done[wIndex] = 0;
923 if (temp & PORT_PE)
924 set_bit(wIndex, &ehci->port_c_suspend);
925 }
926
927 if (temp & PORT_OC)
928 status |= USB_PORT_STAT_OVERCURRENT;
929 if (temp & PORT_RESET)
930 status |= USB_PORT_STAT_RESET;
931 if (temp & PORT_POWER)
932 status |= USB_PORT_STAT_POWER;
933 if (test_bit(wIndex, &ehci->port_c_suspend))
934 status |= USB_PORT_STAT_C_SUSPEND << 16;
935
936 #ifndef VERBOSE_DEBUG
937 if (status & ~0xffff) /* only if wPortChange is interesting */
938 #endif
939 dbg_port (ehci, "GetStatus", wIndex + 1, temp);
940 put_unaligned_le32(status, buf);
941 break;
942 case SetHubFeature:
943 switch (wValue) {
944 case C_HUB_LOCAL_POWER:
945 case C_HUB_OVER_CURRENT:
946 /* no hub-wide feature/status flags */
947 break;
948 default:
949 goto error;
950 }
951 break;
952 case SetPortFeature:
953 selector = wIndex >> 8;
954 wIndex &= 0xff;
955 if (unlikely(ehci->debug)) {
956 /* If the debug port is active any port
957 * feature requests should get denied */
958 if (wIndex == HCS_DEBUG_PORT(ehci->hcs_params) &&
959 (readl(&ehci->debug->control) & DBGP_ENABLED)) {
960 retval = -ENODEV;
961 goto error_exit;
962 }
963 }
964 if (!wIndex || wIndex > ports)
965 goto error;
966 wIndex--;
967 temp = ehci_readl(ehci, status_reg);
968 if (temp & PORT_OWNER)
969 break;
970
971 temp &= ~PORT_RWC_BITS;
972 switch (wValue) {
973 case USB_PORT_FEAT_SUSPEND:
974 if (ehci->no_selective_suspend)
975 break;
976 if ((temp & PORT_PE) == 0
977 || (temp & PORT_RESET) != 0)
978 goto error;
979
980 /* After above check the port must be connected.
981 * Set appropriate bit thus could put phy into low power
982 * mode if we have hostpc feature
983 */
984 temp &= ~PORT_WKCONN_E;
985 temp |= PORT_WKDISC_E | PORT_WKOC_E;
986 ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
987 if (hostpc_reg) {
988 spin_unlock_irqrestore(&ehci->lock, flags);
989 msleep(5);/* 5ms for HCD enter low pwr mode */
990 spin_lock_irqsave(&ehci->lock, flags);
991 temp1 = ehci_readl(ehci, hostpc_reg);
992 ehci_writel(ehci, temp1 | HOSTPC_PHCD,
993 hostpc_reg);
994 temp1 = ehci_readl(ehci, hostpc_reg);
995 ehci_dbg(ehci, "Port%d phy low pwr mode %s\n",
996 wIndex, (temp1 & HOSTPC_PHCD) ?
997 "succeeded" : "failed");
998 }
999 set_bit(wIndex, &ehci->suspended_ports);
1000 break;
1001 case USB_PORT_FEAT_POWER:
1002 if (HCS_PPC (ehci->hcs_params))
1003 ehci_writel(ehci, temp | PORT_POWER,
1004 status_reg);
1005 break;
1006 case USB_PORT_FEAT_RESET:
1007 if (temp & PORT_RESUME)
1008 goto error;
1009 /* line status bits may report this as low speed,
1010 * which can be fine if this root hub has a
1011 * transaction translator built in.
1012 */
1013 if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
1014 && !ehci_is_TDI(ehci)
1015 && PORT_USB11 (temp)) {
1016 ehci_dbg (ehci,
1017 "port %d low speed --> companion\n",
1018 wIndex + 1);
1019 temp |= PORT_OWNER;
1020 } else {
1021 ehci_vdbg (ehci, "port %d reset\n", wIndex + 1);
1022 temp |= PORT_RESET;
1023 temp &= ~PORT_PE;
1024
1025 /*
1026 * caller must wait, then call GetPortStatus
1027 * usb 2.0 spec says 50 ms resets on root
1028 */
1029 ehci->reset_done [wIndex] = jiffies
1030 + msecs_to_jiffies (50);
1031 }
1032 ehci_writel(ehci, temp, status_reg);
1033 break;
1034
1035 /* For downstream facing ports (these): one hub port is put
1036 * into test mode according to USB2 11.24.2.13, then the hub
1037 * must be reset (which for root hub now means rmmod+modprobe,
1038 * or else system reboot). See EHCI 2.3.9 and 4.14 for info
1039 * about the EHCI-specific stuff.
1040 */
1041 case USB_PORT_FEAT_TEST:
1042 if (!selector || selector > 5)
1043 goto error;
1044 ehci_quiesce(ehci);
1045
1046 /* Put all enabled ports into suspend */
1047 while (ports--) {
1048 u32 __iomem *sreg =
1049 &ehci->regs->port_status[ports];
1050
1051 temp = ehci_readl(ehci, sreg) & ~PORT_RWC_BITS;
1052 if (temp & PORT_PE)
1053 ehci_writel(ehci, temp | PORT_SUSPEND,
1054 sreg);
1055 }
1056 ehci_halt(ehci);
1057 temp = ehci_readl(ehci, status_reg);
1058 temp |= selector << 16;
1059 ehci_writel(ehci, temp, status_reg);
1060 break;
1061
1062 default:
1063 goto error;
1064 }
1065 ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
1066 break;
1067
1068 default:
1069 error:
1070 /* "stall" on error */
1071 retval = -EPIPE;
1072 }
1073 error_exit:
1074 spin_unlock_irqrestore (&ehci->lock, flags);
1075 return retval;
1076 }
1077
1078 static void __maybe_unused ehci_relinquish_port(struct usb_hcd *hcd,
1079 int portnum)
1080 {
1081 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
1082
1083 if (ehci_is_TDI(ehci))
1084 return;
1085 set_owner(ehci, --portnum, PORT_OWNER);
1086 }
1087
1088 static int __maybe_unused ehci_port_handed_over(struct usb_hcd *hcd,
1089 int portnum)
1090 {
1091 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
1092 u32 __iomem *reg;
1093
1094 if (ehci_is_TDI(ehci))
1095 return 0;
1096 reg = &ehci->regs->port_status[portnum - 1];
1097 return ehci_readl(ehci, reg) & PORT_OWNER;
1098 }
kernel source for telekom puls (alcatel/mediatek)