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init from v2.6.32.60
[mach-moxart.git] / drivers / usb / host / ehci-hub.c
blobf331b727dc53e53bf364e2e422914a5809f76b65
1 /*
2 * Copyright (C) 2001-2004 by David Brownell
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the
6 * Free Software Foundation; either version 2 of the License, or (at your
7 * option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
11 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software Foundation,
16 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17 */
18
19 /* this file is part of ehci-hcd.c */
20
21 /*-------------------------------------------------------------------------*/
22
23 /*
24 * EHCI Root Hub ... the nonsharable stuff
25 *
26 * Registers don't need cpu_to_le32, that happens transparently
27 */
28
29 /*-------------------------------------------------------------------------*/
30
31 #define PORT_WAKE_BITS (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
32
33 #ifdef CONFIG_PM
34
35 static int ehci_hub_control(
36 struct usb_hcd *hcd,
37 u16 typeReq,
38 u16 wValue,
39 u16 wIndex,
40 char *buf,
41 u16 wLength
42 );
43
44 /* After a power loss, ports that were owned by the companion must be
45 * reset so that the companion can still own them.
46 */
47 static void ehci_handover_companion_ports(struct ehci_hcd *ehci)
48 {
49 u32 __iomem *reg;
50 u32 status;
51 int port;
52 __le32 buf;
53 struct usb_hcd *hcd = ehci_to_hcd(ehci);
54
55 if (!ehci->owned_ports)
56 return;
57
58 /* Give the connections some time to appear */
59 msleep(20);
60
61 port = HCS_N_PORTS(ehci->hcs_params);
62 while (port--) {
63 if (test_bit(port, &ehci->owned_ports)) {
64 reg = &ehci->regs->port_status[port];
65 status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
66
67 /* Port already owned by companion? */
68 if (status & PORT_OWNER)
69 clear_bit(port, &ehci->owned_ports);
70 else if (test_bit(port, &ehci->companion_ports))
71 ehci_writel(ehci, status & ~PORT_PE, reg);
72 else
73 ehci_hub_control(hcd, SetPortFeature,
74 USB_PORT_FEAT_RESET, port + 1,
75 NULL, 0);
76 }
77 }
78
79 if (!ehci->owned_ports)
80 return;
81 msleep(90); /* Wait for resets to complete */
82
83 port = HCS_N_PORTS(ehci->hcs_params);
84 while (port--) {
85 if (test_bit(port, &ehci->owned_ports)) {
86 ehci_hub_control(hcd, GetPortStatus,
87 0, port + 1,
88 (char *) &buf, sizeof(buf));
89
90 /* The companion should now own the port,
91 * but if something went wrong the port must not
92 * remain enabled.
93 */
94 reg = &ehci->regs->port_status[port];
95 status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
96 if (status & PORT_OWNER)
97 ehci_writel(ehci, status | PORT_CSC, reg);
98 else {
99 ehci_dbg(ehci, "failed handover port %d: %x\n",
100 port + 1, status);
101 ehci_writel(ehci, status & ~PORT_PE, reg);
102 }
103 }
104 }
105
106 ehci->owned_ports = 0;
107 }
108
109 static int ehci_bus_suspend (struct usb_hcd *hcd)
110 {
111 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
112 int port;
113 int mask;
114 u32 __iomem *hostpc_reg = NULL;
115
116 ehci_dbg(ehci, "suspend root hub\n");
117
118 if (time_before (jiffies, ehci->next_statechange))
119 msleep(5);
120 del_timer_sync(&ehci->watchdog);
121 del_timer_sync(&ehci->iaa_watchdog);
122
123 spin_lock_irq (&ehci->lock);
124
125 /* Once the controller is stopped, port resumes that are already
126 * in progress won't complete. Hence if remote wakeup is enabled
127 * for the root hub and any ports are in the middle of a resume or
128 * remote wakeup, we must fail the suspend.
129 */
130 if (hcd->self.root_hub->do_remote_wakeup) {
131 port = HCS_N_PORTS(ehci->hcs_params);
132 while (port--) {
133 if (ehci->reset_done[port] != 0) {
134 spin_unlock_irq(&ehci->lock);
135 ehci_dbg(ehci, "suspend failed because "
136 "port %d is resuming\n",
137 port + 1);
138 return -EBUSY;
139 }
140 }
141 }
142
143 /* stop schedules, clean any completed work */
144 if (HC_IS_RUNNING(hcd->state)) {
145 ehci_quiesce (ehci);
146 hcd->state = HC_STATE_QUIESCING;
147 }
148 ehci->command = ehci_readl(ehci, &ehci->regs->command);
149 ehci_work(ehci);
150
151 /* Unlike other USB host controller types, EHCI doesn't have
152 * any notion of "global" or bus-wide suspend. The driver has
153 * to manually suspend all the active unsuspended ports, and
154 * then manually resume them in the bus_resume() routine.
155 */
156 ehci->bus_suspended = 0;
157 ehci->owned_ports = 0;
158 port = HCS_N_PORTS(ehci->hcs_params);
159 while (port--) {
160 u32 __iomem *reg = &ehci->regs->port_status [port];
161 u32 t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
162 u32 t2 = t1;
163
164 if (ehci->has_hostpc)
165 hostpc_reg = (u32 __iomem *)((u8 *)ehci->regs
166 + HOSTPC0 + 4 * (port & 0xff));
167 /* keep track of which ports we suspend */
168 if (t1 & PORT_OWNER)
169 set_bit(port, &ehci->owned_ports);
170 else if ((t1 & PORT_PE) && !(t1 & PORT_SUSPEND)) {
171 t2 |= PORT_SUSPEND;
172 set_bit(port, &ehci->bus_suspended);
173 }
174
175 /* enable remote wakeup on all ports */
176 if (hcd->self.root_hub->do_remote_wakeup) {
177 /* only enable appropriate wake bits, otherwise the
178 * hardware can not go phy low power mode. If a race
179 * condition happens here(connection change during bits
180 * set), the port change detection will finally fix it.
181 */
182 if (t1 & PORT_CONNECT) {
183 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
184 t2 &= ~PORT_WKCONN_E;
185 } else {
186 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
187 t2 &= ~PORT_WKDISC_E;
188 }
189 } else
190 t2 &= ~PORT_WAKE_BITS;
191
192 if (t1 != t2) {
193 ehci_vdbg (ehci, "port %d, %08x -> %08x\n",
194 port + 1, t1, t2);
195 ehci_writel(ehci, t2, reg);
196 if (hostpc_reg) {
197 u32 t3;
198
199 msleep(5);/* 5ms for HCD enter low pwr mode */
200 t3 = ehci_readl(ehci, hostpc_reg);
201 ehci_writel(ehci, t3 | HOSTPC_PHCD, hostpc_reg);
202 t3 = ehci_readl(ehci, hostpc_reg);
203 ehci_dbg(ehci, "Port%d phy low pwr mode %s\n",
204 port, (t3 & HOSTPC_PHCD) ?
205 "succeeded" : "failed");
206 }
207 }
208 }
209
210 /* Apparently some devices need a >= 1-uframe delay here */
211 if (ehci->bus_suspended)
212 udelay(150);
213
214 /* turn off now-idle HC */
215 ehci_halt (ehci);
216 hcd->state = HC_STATE_SUSPENDED;
217
218 if (ehci->reclaim)
219 end_unlink_async(ehci);
220
221 /* allow remote wakeup */
222 mask = INTR_MASK;
223 if (!hcd->self.root_hub->do_remote_wakeup)
224 mask &= ~STS_PCD;
225 ehci_writel(ehci, mask, &ehci->regs->intr_enable);
226 ehci_readl(ehci, &ehci->regs->intr_enable);
227
228 ehci->next_statechange = jiffies + msecs_to_jiffies(10);
229 spin_unlock_irq (&ehci->lock);
230
231 /* ehci_work() may have re-enabled the watchdog timer, which we do not
232 * want, and so we must delete any pending watchdog timer events.
233 */
234 del_timer_sync(&ehci->watchdog);
235 return 0;
236 }
237
238
239 /* caller has locked the root hub, and should reset/reinit on error */
240 static int ehci_bus_resume (struct usb_hcd *hcd)
241 {
242 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
243 u32 temp;
244 u32 power_okay;
245 int i;
246 unsigned long resume_needed = 0;
247
248 if (time_before (jiffies, ehci->next_statechange))
249 msleep(5);
250 spin_lock_irq (&ehci->lock);
251 if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
252 spin_unlock_irq(&ehci->lock);
253 return -ESHUTDOWN;
254 }
255
256 if (unlikely(ehci->debug)) {
257 if (ehci->debug && !dbgp_reset_prep())
258 ehci->debug = NULL;
259 else
260 dbgp_external_startup();
261 }
262
263 /* Ideally and we've got a real resume here, and no port's power
264 * was lost. (For PCI, that means Vaux was maintained.) But we
265 * could instead be restoring a swsusp snapshot -- so that BIOS was
266 * the last user of the controller, not reset/pm hardware keeping
267 * state we gave to it.
268 */
269 power_okay = ehci_readl(ehci, &ehci->regs->intr_enable);
270 ehci_dbg(ehci, "resume root hub%s\n",
271 power_okay ? "" : " after power loss");
272
273 /* at least some APM implementations will try to deliver
274 * IRQs right away, so delay them until we're ready.
275 */
276 ehci_writel(ehci, 0, &ehci->regs->intr_enable);
277
278 /* re-init operational registers */
279 ehci_writel(ehci, 0, &ehci->regs->segment);
280 ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
281 ehci_writel(ehci, (u32) ehci->async->qh_dma, &ehci->regs->async_next);
282
283 /* restore CMD_RUN, framelist size, and irq threshold */
284 ehci_writel(ehci, ehci->command, &ehci->regs->command);
285
286 /* Some controller/firmware combinations need a delay during which
287 * they set up the port statuses. See Bugzilla #8190. */
288 spin_unlock_irq(&ehci->lock);
289 msleep(8);
290 spin_lock_irq(&ehci->lock);
291
292 /* manually resume the ports we suspended during bus_suspend() */
293 i = HCS_N_PORTS (ehci->hcs_params);
294 while (i--) {
295 /* clear phy low power mode before resume */
296 if (ehci->has_hostpc) {
297 u32 __iomem *hostpc_reg =
298 (u32 __iomem *)((u8 *)ehci->regs
299 + HOSTPC0 + 4 * (i & 0xff));
300 temp = ehci_readl(ehci, hostpc_reg);
301 ehci_writel(ehci, temp & ~HOSTPC_PHCD,
302 hostpc_reg);
303 mdelay(5);
304 }
305 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
306 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
307 if (test_bit(i, &ehci->bus_suspended) &&
308 (temp & PORT_SUSPEND)) {
309 temp |= PORT_RESUME;
310 set_bit(i, &resume_needed);
311 }
312 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
313 }
314
315 /* msleep for 20ms only if code is trying to resume port */
316 if (resume_needed) {
317 spin_unlock_irq(&ehci->lock);
318 msleep(20);
319 spin_lock_irq(&ehci->lock);
320 }
321
322 i = HCS_N_PORTS (ehci->hcs_params);
323 while (i--) {
324 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
325 if (test_bit(i, &resume_needed)) {
326 temp &= ~(PORT_RWC_BITS | PORT_RESUME);
327 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
328 ehci_vdbg (ehci, "resumed port %d\n", i + 1);
329 }
330 }
331 (void) ehci_readl(ehci, &ehci->regs->command);
332
333 /* maybe re-activate the schedule(s) */
334 temp = 0;
335 if (ehci->async->qh_next.qh)
336 temp |= CMD_ASE;
337 if (ehci->periodic_sched)
338 temp |= CMD_PSE;
339 if (temp) {
340 ehci->command |= temp;
341 ehci_writel(ehci, ehci->command, &ehci->regs->command);
342 }
343
344 ehci->next_statechange = jiffies + msecs_to_jiffies(5);
345 hcd->state = HC_STATE_RUNNING;
346
347 /* Now we can safely re-enable irqs */
348 ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
349
350 spin_unlock_irq (&ehci->lock);
351 ehci_handover_companion_ports(ehci);
352 return 0;
353 }
354
355 #else
356
357 #define ehci_bus_suspend NULL
358 #define ehci_bus_resume NULL
359
360 #endif /* CONFIG_PM */
361
362 /*-------------------------------------------------------------------------*/
363
364 /* Display the ports dedicated to the companion controller */
365 static ssize_t show_companion(struct device *dev,
366 struct device_attribute *attr,
367 char *buf)
368 {
369 struct ehci_hcd *ehci;
370 int nports, index, n;
371 int count = PAGE_SIZE;
372 char *ptr = buf;
373
374 ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
375 nports = HCS_N_PORTS(ehci->hcs_params);
376
377 for (index = 0; index < nports; ++index) {
378 if (test_bit(index, &ehci->companion_ports)) {
379 n = scnprintf(ptr, count, "%d\n", index + 1);
380 ptr += n;
381 count -= n;
382 }
383 }
384 return ptr - buf;
385 }
386
387 /*
388 * Sets the owner of a port
389 */
390 static void set_owner(struct ehci_hcd *ehci, int portnum, int new_owner)
391 {
392 u32 __iomem *status_reg;
393 u32 port_status;
394 int try;
395
396 status_reg = &ehci->regs->port_status[portnum];
397
398 /*
399 * The controller won't set the OWNER bit if the port is
400 * enabled, so this loop will sometimes require at least two
401 * iterations: one to disable the port and one to set OWNER.
402 */
403 for (try = 4; try > 0; --try) {
404 spin_lock_irq(&ehci->lock);
405 port_status = ehci_readl(ehci, status_reg);
406 if ((port_status & PORT_OWNER) == new_owner
407 || (port_status & (PORT_OWNER | PORT_CONNECT))
408 == 0)
409 try = 0;
410 else {
411 port_status ^= PORT_OWNER;
412 port_status &= ~(PORT_PE | PORT_RWC_BITS);
413 ehci_writel(ehci, port_status, status_reg);
414 }
415 spin_unlock_irq(&ehci->lock);
416 if (try > 1)
417 msleep(5);
418 }
419 }
420
421 /*
422 * Dedicate or undedicate a port to the companion controller.
423 * Syntax is "[-]portnum", where a leading '-' sign means
424 * return control of the port to the EHCI controller.
425 */
426 static ssize_t store_companion(struct device *dev,
427 struct device_attribute *attr,
428 const char *buf, size_t count)
429 {
430 struct ehci_hcd *ehci;
431 int portnum, new_owner;
432
433 ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
434 new_owner = PORT_OWNER; /* Owned by companion */
435 if (sscanf(buf, "%d", &portnum) != 1)
436 return -EINVAL;
437 if (portnum < 0) {
438 portnum = - portnum;
439 new_owner = 0; /* Owned by EHCI */
440 }
441 if (portnum <= 0 || portnum > HCS_N_PORTS(ehci->hcs_params))
442 return -ENOENT;
443 portnum--;
444 if (new_owner)
445 set_bit(portnum, &ehci->companion_ports);
446 else
447 clear_bit(portnum, &ehci->companion_ports);
448 set_owner(ehci, portnum, new_owner);
449 return count;
450 }
451 static DEVICE_ATTR(companion, 0644, show_companion, store_companion);
452
453 static inline void create_companion_file(struct ehci_hcd *ehci)
454 {
455 int i;
456
457 /* with integrated TT there is no companion! */
458 if (!ehci_is_TDI(ehci))
459 i = device_create_file(ehci_to_hcd(ehci)->self.controller,
460 &dev_attr_companion);
461 }
462
463 static inline void remove_companion_file(struct ehci_hcd *ehci)
464 {
465 /* with integrated TT there is no companion! */
466 if (!ehci_is_TDI(ehci))
467 device_remove_file(ehci_to_hcd(ehci)->self.controller,
468 &dev_attr_companion);
469 }
470
471
472 /*-------------------------------------------------------------------------*/
473
474 static int check_reset_complete (
475 struct ehci_hcd *ehci,
476 int index,
477 u32 __iomem *status_reg,
478 int port_status
479 ) {
480 if (!(port_status & PORT_CONNECT))
481 return port_status;
482
483 /* if reset finished and it's still not enabled -- handoff */
484 if (!(port_status & PORT_PE)) {
485
486 /* with integrated TT, there's nobody to hand it to! */
487 if (ehci_is_TDI(ehci)) {
488 ehci_dbg (ehci,
489 "Failed to enable port %d on root hub TT\n",
490 index+1);
491 return port_status;
492 }
493
494 ehci_dbg (ehci, "port %d full speed --> companion\n",
495 index + 1);
496
497 // what happens if HCS_N_CC(params) == 0 ?
498 port_status |= PORT_OWNER;
499 port_status &= ~PORT_RWC_BITS;
500 ehci_writel(ehci, port_status, status_reg);
501
502 /* ensure 440EPX ohci controller state is operational */
503 if (ehci->has_amcc_usb23)
504 set_ohci_hcfs(ehci, 1);
505 } else {
506 ehci_dbg (ehci, "port %d high speed\n", index + 1);
507 /* ensure 440EPx ohci controller state is suspended */
508 if (ehci->has_amcc_usb23)
509 set_ohci_hcfs(ehci, 0);
510 }
511
512 return port_status;
513 }
514
515 /*-------------------------------------------------------------------------*/
516
517
518 /* build "status change" packet (one or two bytes) from HC registers */
519
520 static int
521 ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
522 {
523 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
524 u32 temp, status = 0;
525 u32 mask;
526 int ports, i, retval = 1;
527 unsigned long flags;
528
529 /* if !USB_SUSPEND, root hub timers won't get shut down ... */
530 if (!HC_IS_RUNNING(hcd->state))
531 return 0;
532
533 /* init status to no-changes */
534 buf [0] = 0;
535 ports = HCS_N_PORTS (ehci->hcs_params);
536 if (ports > 7) {
537 buf [1] = 0;
538 retval++;
539 }
540
541 /* Some boards (mostly VIA?) report bogus overcurrent indications,
542 * causing massive log spam unless we completely ignore them. It
543 * may be relevant that VIA VT8235 controllers, where PORT_POWER is
544 * always set, seem to clear PORT_OCC and PORT_CSC when writing to
545 * PORT_POWER; that's surprising, but maybe within-spec.
546 */
547 if (!ignore_oc)
548 mask = PORT_CSC | PORT_PEC | PORT_OCC;
549 else
550 mask = PORT_CSC | PORT_PEC;
551 // PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
552
553 /* no hub change reports (bit 0) for now (power, ...) */
554
555 /* port N changes (bit N)? */
556 spin_lock_irqsave (&ehci->lock, flags);
557 for (i = 0; i < ports; i++) {
558 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
559
560 /*
561 * Return status information even for ports with OWNER set.
562 * Otherwise khubd wouldn't see the disconnect event when a
563 * high-speed device is switched over to the companion
564 * controller by the user.
565 */
566
567 if ((temp & mask) != 0 || test_bit(i, &ehci->port_c_suspend)
568 || (ehci->reset_done[i] && time_after_eq(
569 jiffies, ehci->reset_done[i]))) {
570 if (i < 7)
571 buf [0] |= 1 << (i + 1);
572 else
573 buf [1] |= 1 << (i - 7);
574 status = STS_PCD;
575 }
576 }
577 /* FIXME autosuspend idle root hubs */
578 spin_unlock_irqrestore (&ehci->lock, flags);
579 return status ? retval : 0;
580 }
581
582 /*-------------------------------------------------------------------------*/
583
584 static void
585 ehci_hub_descriptor (
586 struct ehci_hcd *ehci,
587 struct usb_hub_descriptor *desc
588 ) {
589 int ports = HCS_N_PORTS (ehci->hcs_params);
590 u16 temp;
591
592 desc->bDescriptorType = 0x29;
593 desc->bPwrOn2PwrGood = 10; /* ehci 1.0, 2.3.9 says 20ms max */
594 desc->bHubContrCurrent = 0;
595
596 desc->bNbrPorts = ports;
597 temp = 1 + (ports / 8);
598 desc->bDescLength = 7 + 2 * temp;
599
600 /* two bitmaps: ports removable, and usb 1.0 legacy PortPwrCtrlMask */
601 memset (&desc->bitmap [0], 0, temp);
602 memset (&desc->bitmap [temp], 0xff, temp);
603
604 temp = 0x0008; /* per-port overcurrent reporting */
605 if (HCS_PPC (ehci->hcs_params))
606 temp |= 0x0001; /* per-port power control */
607 else
608 temp |= 0x0002; /* no power switching */
609 #if 0
610 // re-enable when we support USB_PORT_FEAT_INDICATOR below.
611 if (HCS_INDICATOR (ehci->hcs_params))
612 temp |= 0x0080; /* per-port indicators (LEDs) */
613 #endif
614 desc->wHubCharacteristics = cpu_to_le16(temp);
615 }
616
617 /*-------------------------------------------------------------------------*/
618
619 static int ehci_hub_control (
620 struct usb_hcd *hcd,
621 u16 typeReq,
622 u16 wValue,
623 u16 wIndex,
624 char *buf,
625 u16 wLength
626 ) {
627 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
628 int ports = HCS_N_PORTS (ehci->hcs_params);
629 u32 __iomem *status_reg = &ehci->regs->port_status[
630 (wIndex & 0xff) - 1];
631 u32 __iomem *hostpc_reg = NULL;
632 u32 temp, temp1, status;
633 unsigned long flags;
634 int retval = 0;
635 unsigned selector;
636
637 /*
638 * FIXME: support SetPortFeatures USB_PORT_FEAT_INDICATOR.
639 * HCS_INDICATOR may say we can change LEDs to off/amber/green.
640 * (track current state ourselves) ... blink for diagnostics,
641 * power, "this is the one", etc. EHCI spec supports this.
642 */
643
644 if (ehci->has_hostpc)
645 hostpc_reg = (u32 __iomem *)((u8 *)ehci->regs
646 + HOSTPC0 + 4 * ((wIndex & 0xff) - 1));
647 spin_lock_irqsave (&ehci->lock, flags);
648 switch (typeReq) {
649 case ClearHubFeature:
650 switch (wValue) {
651 case C_HUB_LOCAL_POWER:
652 case C_HUB_OVER_CURRENT:
653 /* no hub-wide feature/status flags */
654 break;
655 default:
656 goto error;
657 }
658 break;
659 case ClearPortFeature:
660 if (!wIndex || wIndex > ports)
661 goto error;
662 wIndex--;
663 temp = ehci_readl(ehci, status_reg);
664
665 /*
666 * Even if OWNER is set, so the port is owned by the
667 * companion controller, khubd needs to be able to clear
668 * the port-change status bits (especially
669 * USB_PORT_FEAT_C_CONNECTION).
670 */
671
672 switch (wValue) {
673 case USB_PORT_FEAT_ENABLE:
674 ehci_writel(ehci, temp & ~PORT_PE, status_reg);
675 break;
676 case USB_PORT_FEAT_C_ENABLE:
677 ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_PEC,
678 status_reg);
679 break;
680 case USB_PORT_FEAT_SUSPEND:
681 if (temp & PORT_RESET)
682 goto error;
683 if (ehci->no_selective_suspend)
684 break;
685 if (temp & PORT_SUSPEND) {
686 if ((temp & PORT_PE) == 0)
687 goto error;
688 /* clear phy low power mode before resume */
689 if (hostpc_reg) {
690 temp1 = ehci_readl(ehci, hostpc_reg);
691 ehci_writel(ehci, temp1 & ~HOSTPC_PHCD,
692 hostpc_reg);
693 mdelay(5);
694 }
695 /* resume signaling for 20 msec */
696 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
697 ehci_writel(ehci, temp | PORT_RESUME,
698 status_reg);
699 ehci->reset_done [wIndex] = jiffies
700 + msecs_to_jiffies (20);
701 }
702 break;
703 case USB_PORT_FEAT_C_SUSPEND:
704 clear_bit(wIndex, &ehci->port_c_suspend);
705 break;
706 case USB_PORT_FEAT_POWER:
707 if (HCS_PPC (ehci->hcs_params))
708 ehci_writel(ehci,
709 temp & ~(PORT_RWC_BITS | PORT_POWER),
710 status_reg);
711 break;
712 case USB_PORT_FEAT_C_CONNECTION:
713 ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_CSC,
714 status_reg);
715 break;
716 case USB_PORT_FEAT_C_OVER_CURRENT:
717 ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_OCC,
718 status_reg);
719 break;
720 case USB_PORT_FEAT_C_RESET:
721 /* GetPortStatus clears reset */
722 break;
723 default:
724 goto error;
725 }
726 ehci_readl(ehci, &ehci->regs->command); /* unblock posted write */
727 break;
728 case GetHubDescriptor:
729 ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
730 buf);
731 break;
732 case GetHubStatus:
733 /* no hub-wide feature/status flags */
734 memset (buf, 0, 4);
735 //cpu_to_le32s ((u32 *) buf);
736 break;
737 case GetPortStatus:
738 if (!wIndex || wIndex > ports)
739 goto error;
740 wIndex--;
741 status = 0;
742 temp = ehci_readl(ehci, status_reg);
743
744 // wPortChange bits
745 if (temp & PORT_CSC)
746 status |= 1 << USB_PORT_FEAT_C_CONNECTION;
747 if (temp & PORT_PEC)
748 status |= 1 << USB_PORT_FEAT_C_ENABLE;
749
750 if ((temp & PORT_OCC) && !ignore_oc){
751 status |= 1 << USB_PORT_FEAT_C_OVER_CURRENT;
752
753 /*
754 * Hubs should disable port power on over-current.
755 * However, not all EHCI implementations do this
756 * automatically, even if they _do_ support per-port
757 * power switching; they're allowed to just limit the
758 * current. khubd will turn the power back on.
759 */
760 if ((temp & PORT_OC) && HCS_PPC(ehci->hcs_params)) {
761 ehci_writel(ehci,
762 temp & ~(PORT_RWC_BITS | PORT_POWER),
763 status_reg);
764 temp = ehci_readl(ehci, status_reg);
765 }
766 }
767
768 /* whoever resumes must GetPortStatus to complete it!! */
769 if (temp & PORT_RESUME) {
770
771 /* Remote Wakeup received? */
772 if (!ehci->reset_done[wIndex]) {
773 /* resume signaling for 20 msec */
774 ehci->reset_done[wIndex] = jiffies
775 + msecs_to_jiffies(20);
776 /* check the port again */
777 mod_timer(&ehci_to_hcd(ehci)->rh_timer,
778 ehci->reset_done[wIndex]);
779 }
780
781 /* resume completed? */
782 else if (time_after_eq(jiffies,
783 ehci->reset_done[wIndex])) {
784 clear_bit(wIndex, &ehci->suspended_ports);
785 set_bit(wIndex, &ehci->port_c_suspend);
786 ehci->reset_done[wIndex] = 0;
787
788 /* stop resume signaling */
789 temp = ehci_readl(ehci, status_reg);
790 ehci_writel(ehci,
791 temp & ~(PORT_RWC_BITS | PORT_RESUME),
792 status_reg);
793 retval = handshake(ehci, status_reg,
794 PORT_RESUME, 0, 2000 /* 2msec */);
795 if (retval != 0) {
796 ehci_err(ehci,
797 "port %d resume error %d\n",
798 wIndex + 1, retval);
799 goto error;
800 }
801 temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10));
802 }
803 }
804
805 /* whoever resets must GetPortStatus to complete it!! */
806 if ((temp & PORT_RESET)
807 && time_after_eq(jiffies,
808 ehci->reset_done[wIndex])) {
809 status |= 1 << USB_PORT_FEAT_C_RESET;
810 ehci->reset_done [wIndex] = 0;
811
812 /* force reset to complete */
813 ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESET),
814 status_reg);
815 /* REVISIT: some hardware needs 550+ usec to clear
816 * this bit; seems too long to spin routinely...
817 */
818 retval = handshake(ehci, status_reg,
819 PORT_RESET, 0, 750);
820 if (retval != 0) {
821 ehci_err (ehci, "port %d reset error %d\n",
822 wIndex + 1, retval);
823 goto error;
824 }
825
826 /* see what we found out */
827 temp = check_reset_complete (ehci, wIndex, status_reg,
828 ehci_readl(ehci, status_reg));
829 }
830
831 if (!(temp & (PORT_RESUME|PORT_RESET)))
832 ehci->reset_done[wIndex] = 0;
833
834 /* transfer dedicated ports to the companion hc */
835 if ((temp & PORT_CONNECT) &&
836 test_bit(wIndex, &ehci->companion_ports)) {
837 temp &= ~PORT_RWC_BITS;
838 temp |= PORT_OWNER;
839 ehci_writel(ehci, temp, status_reg);
840 ehci_dbg(ehci, "port %d --> companion\n", wIndex + 1);
841 temp = ehci_readl(ehci, status_reg);
842 }
843
844 /*
845 * Even if OWNER is set, there's no harm letting khubd
846 * see the wPortStatus values (they should all be 0 except
847 * for PORT_POWER anyway).
848 */
849
850 if (temp & PORT_CONNECT) {
851 status |= 1 << USB_PORT_FEAT_CONNECTION;
852 // status may be from integrated TT
853 if (ehci->has_hostpc) {
854 temp1 = ehci_readl(ehci, hostpc_reg);
855 status |= ehci_port_speed(ehci, temp1);
856 } else
857 status |= ehci_port_speed(ehci, temp);
858 }
859 if (temp & PORT_PE)
860 status |= 1 << USB_PORT_FEAT_ENABLE;
861
862 /* maybe the port was unsuspended without our knowledge */
863 if (temp & (PORT_SUSPEND|PORT_RESUME)) {
864 status |= 1 << USB_PORT_FEAT_SUSPEND;
865 } else if (test_bit(wIndex, &ehci->suspended_ports)) {
866 clear_bit(wIndex, &ehci->suspended_ports);
867 ehci->reset_done[wIndex] = 0;
868 if (temp & PORT_PE)
869 set_bit(wIndex, &ehci->port_c_suspend);
870 }
871
872 if (temp & PORT_OC)
873 status |= 1 << USB_PORT_FEAT_OVER_CURRENT;
874 if (temp & PORT_RESET)
875 status |= 1 << USB_PORT_FEAT_RESET;
876 if (temp & PORT_POWER)
877 status |= 1 << USB_PORT_FEAT_POWER;
878 if (test_bit(wIndex, &ehci->port_c_suspend))
879 status |= 1 << USB_PORT_FEAT_C_SUSPEND;
880
881 #ifndef VERBOSE_DEBUG
882 if (status & ~0xffff) /* only if wPortChange is interesting */
883 #endif
884 dbg_port (ehci, "GetStatus", wIndex + 1, temp);
885 put_unaligned_le32(status, buf);
886 break;
887 case SetHubFeature:
888 switch (wValue) {
889 case C_HUB_LOCAL_POWER:
890 case C_HUB_OVER_CURRENT:
891 /* no hub-wide feature/status flags */
892 break;
893 default:
894 goto error;
895 }
896 break;
897 case SetPortFeature:
898 selector = wIndex >> 8;
899 wIndex &= 0xff;
900 if (unlikely(ehci->debug)) {
901 /* If the debug port is active any port
902 * feature requests should get denied */
903 if (wIndex == HCS_DEBUG_PORT(ehci->hcs_params) &&
904 (readl(&ehci->debug->control) & DBGP_ENABLED)) {
905 retval = -ENODEV;
906 goto error_exit;
907 }
908 }
909 if (!wIndex || wIndex > ports)
910 goto error;
911 wIndex--;
912 temp = ehci_readl(ehci, status_reg);
913 if (temp & PORT_OWNER)
914 break;
915
916 temp &= ~PORT_RWC_BITS;
917 switch (wValue) {
918 case USB_PORT_FEAT_SUSPEND:
919 if (ehci->no_selective_suspend)
920 break;
921 if ((temp & PORT_PE) == 0
922 || (temp & PORT_RESET) != 0)
923 goto error;
924 ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
925 /* After above check the port must be connected.
926 * Set appropriate bit thus could put phy into low power
927 * mode if we have hostpc feature
928 */
929 if (hostpc_reg) {
930 temp &= ~PORT_WKCONN_E;
931 temp |= (PORT_WKDISC_E | PORT_WKOC_E);
932 ehci_writel(ehci, temp | PORT_SUSPEND,
933 status_reg);
934 msleep(5);/* 5ms for HCD enter low pwr mode */
935 temp1 = ehci_readl(ehci, hostpc_reg);
936 ehci_writel(ehci, temp1 | HOSTPC_PHCD,
937 hostpc_reg);
938 temp1 = ehci_readl(ehci, hostpc_reg);
939 ehci_dbg(ehci, "Port%d phy low pwr mode %s\n",
940 wIndex, (temp1 & HOSTPC_PHCD) ?
941 "succeeded" : "failed");
942 }
943 set_bit(wIndex, &ehci->suspended_ports);
944 break;
945 case USB_PORT_FEAT_POWER:
946 if (HCS_PPC (ehci->hcs_params))
947 ehci_writel(ehci, temp | PORT_POWER,
948 status_reg);
949 break;
950 case USB_PORT_FEAT_RESET:
951 if (temp & PORT_RESUME)
952 goto error;
953 /* line status bits may report this as low speed,
954 * which can be fine if this root hub has a
955 * transaction translator built in.
956 */
957 if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
958 && !ehci_is_TDI(ehci)
959 && PORT_USB11 (temp)) {
960 ehci_dbg (ehci,
961 "port %d low speed --> companion\n",
962 wIndex + 1);
963 temp |= PORT_OWNER;
964 } else {
965 ehci_vdbg (ehci, "port %d reset\n", wIndex + 1);
966 temp |= PORT_RESET;
967 temp &= ~PORT_PE;
968
969 /*
970 * caller must wait, then call GetPortStatus
971 * usb 2.0 spec says 50 ms resets on root
972 */
973 ehci->reset_done [wIndex] = jiffies
974 + msecs_to_jiffies (50);
975 }
976 ehci_writel(ehci, temp, status_reg);
977 break;
978
979 /* For downstream facing ports (these): one hub port is put
980 * into test mode according to USB2 11.24.2.13, then the hub
981 * must be reset (which for root hub now means rmmod+modprobe,
982 * or else system reboot). See EHCI 2.3.9 and 4.14 for info
983 * about the EHCI-specific stuff.
984 */
985 case USB_PORT_FEAT_TEST:
986 if (!selector || selector > 5)
987 goto error;
988 ehci_quiesce(ehci);
989 ehci_halt(ehci);
990 temp |= selector << 16;
991 ehci_writel(ehci, temp, status_reg);
992 break;
993
994 default:
995 goto error;
996 }
997 ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
998 break;
999
1000 default:
1001 error:
1002 /* "stall" on error */
1003 retval = -EPIPE;
1004 }
1005 error_exit:
1006 spin_unlock_irqrestore (&ehci->lock, flags);
1007 return retval;
1008 }
1009
1010 static void ehci_relinquish_port(struct usb_hcd *hcd, int portnum)
1011 {
1012 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
1013
1014 if (ehci_is_TDI(ehci))
1015 return;
1016 set_owner(ehci, --portnum, PORT_OWNER);
1017 }
1018
1019 static int ehci_port_handed_over(struct usb_hcd *hcd, int portnum)
1020 {
1021 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
1022 u32 __iomem *reg;
1023
1024 if (ehci_is_TDI(ehci))
1025 return 0;
1026 reg = &ehci->regs->port_status[portnum - 1];
1027 return ehci_readl(ehci, reg) & PORT_OWNER;
1028 }
Linux MOXA ART SoC ARM port