projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge branch 'for-linus' of git://git.o-hand.com/linux-rpurdie-backlight
[deliverable/linux.git] / drivers / usb / host / ehci-hub.c
1 /*
2 * Copyright (C) 2001-2004 by David Brownell
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the
6 * Free Software Foundation; either version 2 of the License, or (at your
7 * option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
11 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software Foundation,
16 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17 */
18
19 /* this file is part of ehci-hcd.c */
20
21 /*-------------------------------------------------------------------------*/
22
23 /*
24 * EHCI Root Hub ... the nonsharable stuff
25 *
26 * Registers don't need cpu_to_le32, that happens transparently
27 */
28
29 /*-------------------------------------------------------------------------*/
30
31 #define PORT_WAKE_BITS (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
32
33 #ifdef CONFIG_PM
34
35 static int ehci_hub_control(
36 struct usb_hcd *hcd,
37 u16 typeReq,
38 u16 wValue,
39 u16 wIndex,
40 char *buf,
41 u16 wLength
42 );
43
44 /* After a power loss, ports that were owned by the companion must be
45 * reset so that the companion can still own them.
46 */
47 static void ehci_handover_companion_ports(struct ehci_hcd *ehci)
48 {
49 u32 __iomem *reg;
50 u32 status;
51 int port;
52 __le32 buf;
53 struct usb_hcd *hcd = ehci_to_hcd(ehci);
54
55 if (!ehci->owned_ports)
56 return;
57
58 /* Give the connections some time to appear */
59 msleep(20);
60
61 port = HCS_N_PORTS(ehci->hcs_params);
62 while (port--) {
63 if (test_bit(port, &ehci->owned_ports)) {
64 reg = &ehci->regs->port_status[port];
65 status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
66
67 /* Port already owned by companion? */
68 if (status & PORT_OWNER)
69 clear_bit(port, &ehci->owned_ports);
70 else if (test_bit(port, &ehci->companion_ports))
71 ehci_writel(ehci, status & ~PORT_PE, reg);
72 else
73 ehci_hub_control(hcd, SetPortFeature,
74 USB_PORT_FEAT_RESET, port + 1,
75 NULL, 0);
76 }
77 }
78
79 if (!ehci->owned_ports)
80 return;
81 msleep(90); /* Wait for resets to complete */
82
83 port = HCS_N_PORTS(ehci->hcs_params);
84 while (port--) {
85 if (test_bit(port, &ehci->owned_ports)) {
86 ehci_hub_control(hcd, GetPortStatus,
87 0, port + 1,
88 (char *) &buf, sizeof(buf));
89
90 /* The companion should now own the port,
91 * but if something went wrong the port must not
92 * remain enabled.
93 */
94 reg = &ehci->regs->port_status[port];
95 status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
96 if (status & PORT_OWNER)
97 ehci_writel(ehci, status | PORT_CSC, reg);
98 else {
99 ehci_dbg(ehci, "failed handover port %d: %x\n",
100 port + 1, status);
101 ehci_writel(ehci, status & ~PORT_PE, reg);
102 }
103 }
104 }
105
106 ehci->owned_ports = 0;
107 }
108
109 static 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 port = HCS_N_PORTS (ehci->hcs_params);
124 spin_lock_irq (&ehci->lock);
125
126 /* stop schedules, clean any completed work */
127 if (HC_IS_RUNNING(hcd->state)) {
128 ehci_quiesce (ehci);
129 hcd->state = HC_STATE_QUIESCING;
130 }
131 ehci->command = ehci_readl(ehci, &ehci->regs->command);
132 ehci_work(ehci);
133
134 /* Unlike other USB host controller types, EHCI doesn't have
135 * any notion of "global" or bus-wide suspend. The driver has
136 * to manually suspend all the active unsuspended ports, and
137 * then manually resume them in the bus_resume() routine.
138 */
139 ehci->bus_suspended = 0;
140 ehci->owned_ports = 0;
141 while (port--) {
142 u32 __iomem *reg = &ehci->regs->port_status [port];
143 u32 t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
144 u32 t2 = t1;
145
146 if (ehci->has_hostpc)
147 hostpc_reg = (u32 __iomem *)((u8 *)ehci->regs
148 + HOSTPC0 + 4 * (port & 0xff));
149 /* keep track of which ports we suspend */
150 if (t1 & PORT_OWNER)
151 set_bit(port, &ehci->owned_ports);
152 else if ((t1 & PORT_PE) && !(t1 & PORT_SUSPEND)) {
153 t2 |= PORT_SUSPEND;
154 set_bit(port, &ehci->bus_suspended);
155 }
156
157 /* enable remote wakeup on all ports */
158 if (hcd->self.root_hub->do_remote_wakeup) {
159 /* only enable appropriate wake bits, otherwise the
160 * hardware can not go phy low power mode. If a race
161 * condition happens here(connection change during bits
162 * set), the port change detection will finally fix it.
163 */
164 if (t1 & PORT_CONNECT) {
165 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
166 t2 &= ~PORT_WKCONN_E;
167 } else {
168 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
169 t2 &= ~PORT_WKDISC_E;
170 }
171 } else
172 t2 &= ~PORT_WAKE_BITS;
173
174 if (t1 != t2) {
175 ehci_vdbg (ehci, "port %d, %08x -> %08x\n",
176 port + 1, t1, t2);
177 ehci_writel(ehci, t2, reg);
178 if (hostpc_reg) {
179 u32 t3;
180
181 msleep(5);/* 5ms for HCD enter low pwr mode */
182 t3 = ehci_readl(ehci, hostpc_reg);
183 ehci_writel(ehci, t3 | HOSTPC_PHCD, hostpc_reg);
184 t3 = ehci_readl(ehci, hostpc_reg);
185 ehci_dbg(ehci, "Port%d phy low pwr mode %s\n",
186 port, (t3 & HOSTPC_PHCD) ?
187 "succeeded" : "failed");
188 }
189 }
190 }
191
192 /* Apparently some devices need a >= 1-uframe delay here */
193 if (ehci->bus_suspended)
194 udelay(150);
195
196 /* turn off now-idle HC */
197 ehci_halt (ehci);
198 hcd->state = HC_STATE_SUSPENDED;
199
200 if (ehci->reclaim)
201 end_unlink_async(ehci);
202
203 /* allow remote wakeup */
204 mask = INTR_MASK;
205 if (!hcd->self.root_hub->do_remote_wakeup)
206 mask &= ~STS_PCD;
207 ehci_writel(ehci, mask, &ehci->regs->intr_enable);
208 ehci_readl(ehci, &ehci->regs->intr_enable);
209
210 ehci->next_statechange = jiffies + msecs_to_jiffies(10);
211 spin_unlock_irq (&ehci->lock);
212
213 /* ehci_work() may have re-enabled the watchdog timer, which we do not
214 * want, and so we must delete any pending watchdog timer events.
215 */
216 del_timer_sync(&ehci->watchdog);
217 return 0;
218 }
219
220
221 /* caller has locked the root hub, and should reset/reinit on error */
222 static int ehci_bus_resume (struct usb_hcd *hcd)
223 {
224 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
225 u32 temp;
226 u32 power_okay;
227 int i;
228 u8 resume_needed = 0;
229
230 if (time_before (jiffies, ehci->next_statechange))
231 msleep(5);
232 spin_lock_irq (&ehci->lock);
233 if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
234 spin_unlock_irq(&ehci->lock);
235 return -ESHUTDOWN;
236 }
237
238 if (unlikely(ehci->debug)) {
239 if (ehci->debug && !dbgp_reset_prep())
240 ehci->debug = NULL;
241 else
242 dbgp_external_startup();
243 }
244
245 /* Ideally and we've got a real resume here, and no port's power
246 * was lost. (For PCI, that means Vaux was maintained.) But we
247 * could instead be restoring a swsusp snapshot -- so that BIOS was
248 * the last user of the controller, not reset/pm hardware keeping
249 * state we gave to it.
250 */
251 power_okay = ehci_readl(ehci, &ehci->regs->intr_enable);
252 ehci_dbg(ehci, "resume root hub%s\n",
253 power_okay ? "" : " after power loss");
254
255 /* at least some APM implementations will try to deliver
256 * IRQs right away, so delay them until we're ready.
257 */
258 ehci_writel(ehci, 0, &ehci->regs->intr_enable);
259
260 /* re-init operational registers */
261 ehci_writel(ehci, 0, &ehci->regs->segment);
262 ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
263 ehci_writel(ehci, (u32) ehci->async->qh_dma, &ehci->regs->async_next);
264
265 /* restore CMD_RUN, framelist size, and irq threshold */
266 ehci_writel(ehci, ehci->command, &ehci->regs->command);
267
268 /* Some controller/firmware combinations need a delay during which
269 * they set up the port statuses. See Bugzilla #8190. */
270 spin_unlock_irq(&ehci->lock);
271 msleep(8);
272 spin_lock_irq(&ehci->lock);
273
274 /* manually resume the ports we suspended during bus_suspend() */
275 i = HCS_N_PORTS (ehci->hcs_params);
276 while (i--) {
277 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
278 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
279 if (test_bit(i, &ehci->bus_suspended) &&
280 (temp & PORT_SUSPEND)) {
281 temp |= PORT_RESUME;
282 resume_needed = 1;
283 }
284 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
285 }
286
287 /* msleep for 20ms only if code is trying to resume port */
288 if (resume_needed) {
289 spin_unlock_irq(&ehci->lock);
290 msleep(20);
291 spin_lock_irq(&ehci->lock);
292 }
293
294 i = HCS_N_PORTS (ehci->hcs_params);
295 while (i--) {
296 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
297 if (test_bit(i, &ehci->bus_suspended) &&
298 (temp & PORT_SUSPEND)) {
299 temp &= ~(PORT_RWC_BITS | PORT_RESUME);
300 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
301 ehci_vdbg (ehci, "resumed port %d\n", i + 1);
302 }
303 }
304 (void) ehci_readl(ehci, &ehci->regs->command);
305
306 /* maybe re-activate the schedule(s) */
307 temp = 0;
308 if (ehci->async->qh_next.qh)
309 temp |= CMD_ASE;
310 if (ehci->periodic_sched)
311 temp |= CMD_PSE;
312 if (temp) {
313 ehci->command |= temp;
314 ehci_writel(ehci, ehci->command, &ehci->regs->command);
315 }
316
317 ehci->next_statechange = jiffies + msecs_to_jiffies(5);
318 hcd->state = HC_STATE_RUNNING;
319
320 /* Now we can safely re-enable irqs */
321 ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
322
323 spin_unlock_irq (&ehci->lock);
324 ehci_handover_companion_ports(ehci);
325 return 0;
326 }
327
328 #else
329
330 #define ehci_bus_suspend NULL
331 #define ehci_bus_resume NULL
332
333 #endif /* CONFIG_PM */
334
335 /*-------------------------------------------------------------------------*/
336
337 /* Display the ports dedicated to the companion controller */
338 static ssize_t show_companion(struct device *dev,
339 struct device_attribute *attr,
340 char *buf)
341 {
342 struct ehci_hcd *ehci;
343 int nports, index, n;
344 int count = PAGE_SIZE;
345 char *ptr = buf;
346
347 ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
348 nports = HCS_N_PORTS(ehci->hcs_params);
349
350 for (index = 0; index < nports; ++index) {
351 if (test_bit(index, &ehci->companion_ports)) {
352 n = scnprintf(ptr, count, "%d\n", index + 1);
353 ptr += n;
354 count -= n;
355 }
356 }
357 return ptr - buf;
358 }
359
360 /*
361 * Sets the owner of a port
362 */
363 static void set_owner(struct ehci_hcd *ehci, int portnum, int new_owner)
364 {
365 u32 __iomem *status_reg;
366 u32 port_status;
367 int try;
368
369 status_reg = &ehci->regs->port_status[portnum];
370
371 /*
372 * The controller won't set the OWNER bit if the port is
373 * enabled, so this loop will sometimes require at least two
374 * iterations: one to disable the port and one to set OWNER.
375 */
376 for (try = 4; try > 0; --try) {
377 spin_lock_irq(&ehci->lock);
378 port_status = ehci_readl(ehci, status_reg);
379 if ((port_status & PORT_OWNER) == new_owner
380 || (port_status & (PORT_OWNER | PORT_CONNECT))
381 == 0)
382 try = 0;
383 else {
384 port_status ^= PORT_OWNER;
385 port_status &= ~(PORT_PE | PORT_RWC_BITS);
386 ehci_writel(ehci, port_status, status_reg);
387 }
388 spin_unlock_irq(&ehci->lock);
389 if (try > 1)
390 msleep(5);
391 }
392 }
393
394 /*
395 * Dedicate or undedicate a port to the companion controller.
396 * Syntax is "[-]portnum", where a leading '-' sign means
397 * return control of the port to the EHCI controller.
398 */
399 static ssize_t store_companion(struct device *dev,
400 struct device_attribute *attr,
401 const char *buf, size_t count)
402 {
403 struct ehci_hcd *ehci;
404 int portnum, new_owner;
405
406 ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
407 new_owner = PORT_OWNER; /* Owned by companion */
408 if (sscanf(buf, "%d", &portnum) != 1)
409 return -EINVAL;
410 if (portnum < 0) {
411 portnum = - portnum;
412 new_owner = 0; /* Owned by EHCI */
413 }
414 if (portnum <= 0 || portnum > HCS_N_PORTS(ehci->hcs_params))
415 return -ENOENT;
416 portnum--;
417 if (new_owner)
418 set_bit(portnum, &ehci->companion_ports);
419 else
420 clear_bit(portnum, &ehci->companion_ports);
421 set_owner(ehci, portnum, new_owner);
422 return count;
423 }
424 static DEVICE_ATTR(companion, 0644, show_companion, store_companion);
425
426 static inline void create_companion_file(struct ehci_hcd *ehci)
427 {
428 int i;
429
430 /* with integrated TT there is no companion! */
431 if (!ehci_is_TDI(ehci))
432 i = device_create_file(ehci_to_hcd(ehci)->self.controller,
433 &dev_attr_companion);
434 }
435
436 static inline void remove_companion_file(struct ehci_hcd *ehci)
437 {
438 /* with integrated TT there is no companion! */
439 if (!ehci_is_TDI(ehci))
440 device_remove_file(ehci_to_hcd(ehci)->self.controller,
441 &dev_attr_companion);
442 }
443
444
445 /*-------------------------------------------------------------------------*/
446
447 static int check_reset_complete (
448 struct ehci_hcd *ehci,
449 int index,
450 u32 __iomem *status_reg,
451 int port_status
452 ) {
453 if (!(port_status & PORT_CONNECT))
454 return port_status;
455
456 /* if reset finished and it's still not enabled -- handoff */
457 if (!(port_status & PORT_PE)) {
458
459 /* with integrated TT, there's nobody to hand it to! */
460 if (ehci_is_TDI(ehci)) {
461 ehci_dbg (ehci,
462 "Failed to enable port %d on root hub TT\n",
463 index+1);
464 return port_status;
465 }
466
467 ehci_dbg (ehci, "port %d full speed --> companion\n",
468 index + 1);
469
470 // what happens if HCS_N_CC(params) == 0 ?
471 port_status |= PORT_OWNER;
472 port_status &= ~PORT_RWC_BITS;
473 ehci_writel(ehci, port_status, status_reg);
474
475 /* ensure 440EPX ohci controller state is operational */
476 if (ehci->has_amcc_usb23)
477 set_ohci_hcfs(ehci, 1);
478 } else {
479 ehci_dbg (ehci, "port %d high speed\n", index + 1);
480 /* ensure 440EPx ohci controller state is suspended */
481 if (ehci->has_amcc_usb23)
482 set_ohci_hcfs(ehci, 0);
483 }
484
485 return port_status;
486 }
487
488 /*-------------------------------------------------------------------------*/
489
490
491 /* build "status change" packet (one or two bytes) from HC registers */
492
493 static int
494 ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
495 {
496 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
497 u32 temp, status = 0;
498 u32 mask;
499 int ports, i, retval = 1;
500 unsigned long flags;
501
502 /* if !USB_SUSPEND, root hub timers won't get shut down ... */
503 if (!HC_IS_RUNNING(hcd->state))
504 return 0;
505
506 /* init status to no-changes */
507 buf [0] = 0;
508 ports = HCS_N_PORTS (ehci->hcs_params);
509 if (ports > 7) {
510 buf [1] = 0;
511 retval++;
512 }
513
514 /* Some boards (mostly VIA?) report bogus overcurrent indications,
515 * causing massive log spam unless we completely ignore them. It
516 * may be relevant that VIA VT8235 controllers, where PORT_POWER is
517 * always set, seem to clear PORT_OCC and PORT_CSC when writing to
518 * PORT_POWER; that's surprising, but maybe within-spec.
519 */
520 if (!ignore_oc)
521 mask = PORT_CSC | PORT_PEC | PORT_OCC;
522 else
523 mask = PORT_CSC | PORT_PEC;
524 // PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
525
526 /* no hub change reports (bit 0) for now (power, ...) */
527
528 /* port N changes (bit N)? */
529 spin_lock_irqsave (&ehci->lock, flags);
530 for (i = 0; i < ports; i++) {
531 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
532
533 /*
534 * Return status information even for ports with OWNER set.
535 * Otherwise khubd wouldn't see the disconnect event when a
536 * high-speed device is switched over to the companion
537 * controller by the user.
538 */
539
540 if ((temp & mask) != 0 || test_bit(i, &ehci->port_c_suspend)
541 || (ehci->reset_done[i] && time_after_eq(
542 jiffies, ehci->reset_done[i]))) {
543 if (i < 7)
544 buf [0] |= 1 << (i + 1);
545 else
546 buf [1] |= 1 << (i - 7);
547 status = STS_PCD;
548 }
549 }
550 /* FIXME autosuspend idle root hubs */
551 spin_unlock_irqrestore (&ehci->lock, flags);
552 return status ? retval : 0;
553 }
554
555 /*-------------------------------------------------------------------------*/
556
557 static void
558 ehci_hub_descriptor (
559 struct ehci_hcd *ehci,
560 struct usb_hub_descriptor *desc
561 ) {
562 int ports = HCS_N_PORTS (ehci->hcs_params);
563 u16 temp;
564
565 desc->bDescriptorType = 0x29;
566 desc->bPwrOn2PwrGood = 10; /* ehci 1.0, 2.3.9 says 20ms max */
567 desc->bHubContrCurrent = 0;
568
569 desc->bNbrPorts = ports;
570 temp = 1 + (ports / 8);
571 desc->bDescLength = 7 + 2 * temp;
572
573 /* two bitmaps: ports removable, and usb 1.0 legacy PortPwrCtrlMask */
574 memset (&desc->bitmap [0], 0, temp);
575 memset (&desc->bitmap [temp], 0xff, temp);
576
577 temp = 0x0008; /* per-port overcurrent reporting */
578 if (HCS_PPC (ehci->hcs_params))
579 temp |= 0x0001; /* per-port power control */
580 else
581 temp |= 0x0002; /* no power switching */
582 #if 0
583 // re-enable when we support USB_PORT_FEAT_INDICATOR below.
584 if (HCS_INDICATOR (ehci->hcs_params))
585 temp |= 0x0080; /* per-port indicators (LEDs) */
586 #endif
587 desc->wHubCharacteristics = cpu_to_le16(temp);
588 }
589
590 /*-------------------------------------------------------------------------*/
591
592 static int ehci_hub_control (
593 struct usb_hcd *hcd,
594 u16 typeReq,
595 u16 wValue,
596 u16 wIndex,
597 char *buf,
598 u16 wLength
599 ) {
600 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
601 int ports = HCS_N_PORTS (ehci->hcs_params);
602 u32 __iomem *status_reg = &ehci->regs->port_status[
603 (wIndex & 0xff) - 1];
604 u32 __iomem *hostpc_reg = NULL;
605 u32 temp, temp1, status;
606 unsigned long flags;
607 int retval = 0;
608 unsigned selector;
609
610 /*
611 * FIXME: support SetPortFeatures USB_PORT_FEAT_INDICATOR.
612 * HCS_INDICATOR may say we can change LEDs to off/amber/green.
613 * (track current state ourselves) ... blink for diagnostics,
614 * power, "this is the one", etc. EHCI spec supports this.
615 */
616
617 if (ehci->has_hostpc)
618 hostpc_reg = (u32 __iomem *)((u8 *)ehci->regs
619 + HOSTPC0 + 4 * ((wIndex & 0xff) - 1));
620 spin_lock_irqsave (&ehci->lock, flags);
621 switch (typeReq) {
622 case ClearHubFeature:
623 switch (wValue) {
624 case C_HUB_LOCAL_POWER:
625 case C_HUB_OVER_CURRENT:
626 /* no hub-wide feature/status flags */
627 break;
628 default:
629 goto error;
630 }
631 break;
632 case ClearPortFeature:
633 if (!wIndex || wIndex > ports)
634 goto error;
635 wIndex--;
636 temp = ehci_readl(ehci, status_reg);
637
638 /*
639 * Even if OWNER is set, so the port is owned by the
640 * companion controller, khubd needs to be able to clear
641 * the port-change status bits (especially
642 * USB_PORT_FEAT_C_CONNECTION).
643 */
644
645 switch (wValue) {
646 case USB_PORT_FEAT_ENABLE:
647 ehci_writel(ehci, temp & ~PORT_PE, status_reg);
648 break;
649 case USB_PORT_FEAT_C_ENABLE:
650 ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_PEC,
651 status_reg);
652 break;
653 case USB_PORT_FEAT_SUSPEND:
654 if (temp & PORT_RESET)
655 goto error;
656 if (ehci->no_selective_suspend)
657 break;
658 if (temp & PORT_SUSPEND) {
659 if ((temp & PORT_PE) == 0)
660 goto error;
661 /* resume signaling for 20 msec */
662 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
663 ehci_writel(ehci, temp | PORT_RESUME,
664 status_reg);
665 ehci->reset_done [wIndex] = jiffies
666 + msecs_to_jiffies (20);
667 }
668 break;
669 case USB_PORT_FEAT_C_SUSPEND:
670 clear_bit(wIndex, &ehci->port_c_suspend);
671 break;
672 case USB_PORT_FEAT_POWER:
673 if (HCS_PPC (ehci->hcs_params))
674 ehci_writel(ehci,
675 temp & ~(PORT_RWC_BITS | PORT_POWER),
676 status_reg);
677 break;
678 case USB_PORT_FEAT_C_CONNECTION:
679 ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_CSC,
680 status_reg);
681 break;
682 case USB_PORT_FEAT_C_OVER_CURRENT:
683 ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_OCC,
684 status_reg);
685 break;
686 case USB_PORT_FEAT_C_RESET:
687 /* GetPortStatus clears reset */
688 break;
689 default:
690 goto error;
691 }
692 ehci_readl(ehci, &ehci->regs->command); /* unblock posted write */
693 break;
694 case GetHubDescriptor:
695 ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
696 buf);
697 break;
698 case GetHubStatus:
699 /* no hub-wide feature/status flags */
700 memset (buf, 0, 4);
701 //cpu_to_le32s ((u32 *) buf);
702 break;
703 case GetPortStatus:
704 if (!wIndex || wIndex > ports)
705 goto error;
706 wIndex--;
707 status = 0;
708 temp = ehci_readl(ehci, status_reg);
709
710 // wPortChange bits
711 if (temp & PORT_CSC)
712 status |= 1 << USB_PORT_FEAT_C_CONNECTION;
713 if (temp & PORT_PEC)
714 status |= 1 << USB_PORT_FEAT_C_ENABLE;
715
716 if ((temp & PORT_OCC) && !ignore_oc){
717 status |= 1 << USB_PORT_FEAT_C_OVER_CURRENT;
718
719 /*
720 * Hubs should disable port power on over-current.
721 * However, not all EHCI implementations do this
722 * automatically, even if they _do_ support per-port
723 * power switching; they're allowed to just limit the
724 * current. khubd will turn the power back on.
725 */
726 if (HCS_PPC (ehci->hcs_params)){
727 ehci_writel(ehci,
728 temp & ~(PORT_RWC_BITS | PORT_POWER),
729 status_reg);
730 }
731 }
732
733 /* whoever resumes must GetPortStatus to complete it!! */
734 if (temp & PORT_RESUME) {
735
736 /* Remote Wakeup received? */
737 if (!ehci->reset_done[wIndex]) {
738 /* resume signaling for 20 msec */
739 ehci->reset_done[wIndex] = jiffies
740 + msecs_to_jiffies(20);
741 /* check the port again */
742 mod_timer(&ehci_to_hcd(ehci)->rh_timer,
743 ehci->reset_done[wIndex]);
744 }
745
746 /* resume completed? */
747 else if (time_after_eq(jiffies,
748 ehci->reset_done[wIndex])) {
749 clear_bit(wIndex, &ehci->suspended_ports);
750 set_bit(wIndex, &ehci->port_c_suspend);
751 ehci->reset_done[wIndex] = 0;
752
753 /* stop resume signaling */
754 temp = ehci_readl(ehci, status_reg);
755 ehci_writel(ehci,
756 temp & ~(PORT_RWC_BITS | PORT_RESUME),
757 status_reg);
758 retval = handshake(ehci, status_reg,
759 PORT_RESUME, 0, 2000 /* 2msec */);
760 if (retval != 0) {
761 ehci_err(ehci,
762 "port %d resume error %d\n",
763 wIndex + 1, retval);
764 goto error;
765 }
766 temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10));
767 }
768 }
769
770 /* whoever resets must GetPortStatus to complete it!! */
771 if ((temp & PORT_RESET)
772 && time_after_eq(jiffies,
773 ehci->reset_done[wIndex])) {
774 status |= 1 << USB_PORT_FEAT_C_RESET;
775 ehci->reset_done [wIndex] = 0;
776
777 /* force reset to complete */
778 ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESET),
779 status_reg);
780 /* REVISIT: some hardware needs 550+ usec to clear
781 * this bit; seems too long to spin routinely...
782 */
783 retval = handshake(ehci, status_reg,
784 PORT_RESET, 0, 750);
785 if (retval != 0) {
786 ehci_err (ehci, "port %d reset error %d\n",
787 wIndex + 1, retval);
788 goto error;
789 }
790
791 /* see what we found out */
792 temp = check_reset_complete (ehci, wIndex, status_reg,
793 ehci_readl(ehci, status_reg));
794 }
795
796 if (!(temp & (PORT_RESUME|PORT_RESET)))
797 ehci->reset_done[wIndex] = 0;
798
799 /* transfer dedicated ports to the companion hc */
800 if ((temp & PORT_CONNECT) &&
801 test_bit(wIndex, &ehci->companion_ports)) {
802 temp &= ~PORT_RWC_BITS;
803 temp |= PORT_OWNER;
804 ehci_writel(ehci, temp, status_reg);
805 ehci_dbg(ehci, "port %d --> companion\n", wIndex + 1);
806 temp = ehci_readl(ehci, status_reg);
807 }
808
809 /*
810 * Even if OWNER is set, there's no harm letting khubd
811 * see the wPortStatus values (they should all be 0 except
812 * for PORT_POWER anyway).
813 */
814
815 if (temp & PORT_CONNECT) {
816 status |= 1 << USB_PORT_FEAT_CONNECTION;
817 // status may be from integrated TT
818 if (ehci->has_hostpc) {
819 temp1 = ehci_readl(ehci, hostpc_reg);
820 status |= ehci_port_speed(ehci, temp1);
821 } else
822 status |= ehci_port_speed(ehci, temp);
823 }
824 if (temp & PORT_PE)
825 status |= 1 << USB_PORT_FEAT_ENABLE;
826
827 /* maybe the port was unsuspended without our knowledge */
828 if (temp & (PORT_SUSPEND|PORT_RESUME)) {
829 status |= 1 << USB_PORT_FEAT_SUSPEND;
830 } else if (test_bit(wIndex, &ehci->suspended_ports)) {
831 clear_bit(wIndex, &ehci->suspended_ports);
832 ehci->reset_done[wIndex] = 0;
833 if (temp & PORT_PE)
834 set_bit(wIndex, &ehci->port_c_suspend);
835 }
836
837 if (temp & PORT_OC)
838 status |= 1 << USB_PORT_FEAT_OVER_CURRENT;
839 if (temp & PORT_RESET)
840 status |= 1 << USB_PORT_FEAT_RESET;
841 if (temp & PORT_POWER)
842 status |= 1 << USB_PORT_FEAT_POWER;
843 if (test_bit(wIndex, &ehci->port_c_suspend))
844 status |= 1 << USB_PORT_FEAT_C_SUSPEND;
845
846 #ifndef VERBOSE_DEBUG
847 if (status & ~0xffff) /* only if wPortChange is interesting */
848 #endif
849 dbg_port (ehci, "GetStatus", wIndex + 1, temp);
850 put_unaligned_le32(status, buf);
851 break;
852 case SetHubFeature:
853 switch (wValue) {
854 case C_HUB_LOCAL_POWER:
855 case C_HUB_OVER_CURRENT:
856 /* no hub-wide feature/status flags */
857 break;
858 default:
859 goto error;
860 }
861 break;
862 case SetPortFeature:
863 selector = wIndex >> 8;
864 wIndex &= 0xff;
865 if (unlikely(ehci->debug)) {
866 /* If the debug port is active any port
867 * feature requests should get denied */
868 if (wIndex == HCS_DEBUG_PORT(ehci->hcs_params) &&
869 (readl(&ehci->debug->control) & DBGP_ENABLED)) {
870 retval = -ENODEV;
871 goto error_exit;
872 }
873 }
874 if (!wIndex || wIndex > ports)
875 goto error;
876 wIndex--;
877 temp = ehci_readl(ehci, status_reg);
878 if (temp & PORT_OWNER)
879 break;
880
881 temp &= ~PORT_RWC_BITS;
882 switch (wValue) {
883 case USB_PORT_FEAT_SUSPEND:
884 if (ehci->no_selective_suspend)
885 break;
886 if ((temp & PORT_PE) == 0
887 || (temp & PORT_RESET) != 0)
888 goto error;
889 ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
890 /* After above check the port must be connected.
891 * Set appropriate bit thus could put phy into low power
892 * mode if we have hostpc feature
893 */
894 if (hostpc_reg) {
895 temp &= ~PORT_WKCONN_E;
896 temp |= (PORT_WKDISC_E | PORT_WKOC_E);
897 ehci_writel(ehci, temp | PORT_SUSPEND,
898 status_reg);
899 msleep(5);/* 5ms for HCD enter low pwr mode */
900 temp1 = ehci_readl(ehci, hostpc_reg);
901 ehci_writel(ehci, temp1 | HOSTPC_PHCD,
902 hostpc_reg);
903 temp1 = ehci_readl(ehci, hostpc_reg);
904 ehci_dbg(ehci, "Port%d phy low pwr mode %s\n",
905 wIndex, (temp1 & HOSTPC_PHCD) ?
906 "succeeded" : "failed");
907 }
908 set_bit(wIndex, &ehci->suspended_ports);
909 break;
910 case USB_PORT_FEAT_POWER:
911 if (HCS_PPC (ehci->hcs_params))
912 ehci_writel(ehci, temp | PORT_POWER,
913 status_reg);
914 break;
915 case USB_PORT_FEAT_RESET:
916 if (temp & PORT_RESUME)
917 goto error;
918 /* line status bits may report this as low speed,
919 * which can be fine if this root hub has a
920 * transaction translator built in.
921 */
922 if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
923 && !ehci_is_TDI(ehci)
924 && PORT_USB11 (temp)) {
925 ehci_dbg (ehci,
926 "port %d low speed --> companion\n",
927 wIndex + 1);
928 temp |= PORT_OWNER;
929 } else {
930 ehci_vdbg (ehci, "port %d reset\n", wIndex + 1);
931 temp |= PORT_RESET;
932 temp &= ~PORT_PE;
933
934 /*
935 * caller must wait, then call GetPortStatus
936 * usb 2.0 spec says 50 ms resets on root
937 */
938 ehci->reset_done [wIndex] = jiffies
939 + msecs_to_jiffies (50);
940 }
941 ehci_writel(ehci, temp, status_reg);
942 break;
943
944 /* For downstream facing ports (these): one hub port is put
945 * into test mode according to USB2 11.24.2.13, then the hub
946 * must be reset (which for root hub now means rmmod+modprobe,
947 * or else system reboot). See EHCI 2.3.9 and 4.14 for info
948 * about the EHCI-specific stuff.
949 */
950 case USB_PORT_FEAT_TEST:
951 if (!selector || selector > 5)
952 goto error;
953 ehci_quiesce(ehci);
954 ehci_halt(ehci);
955 temp |= selector << 16;
956 ehci_writel(ehci, temp, status_reg);
957 break;
958
959 default:
960 goto error;
961 }
962 ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
963 break;
964
965 default:
966 error:
967 /* "stall" on error */
968 retval = -EPIPE;
969 }
970 error_exit:
971 spin_unlock_irqrestore (&ehci->lock, flags);
972 return retval;
973 }
974
975 static void ehci_relinquish_port(struct usb_hcd *hcd, int portnum)
976 {
977 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
978
979 if (ehci_is_TDI(ehci))
980 return;
981 set_owner(ehci, --portnum, PORT_OWNER);
982 }
983
984 static int ehci_port_handed_over(struct usb_hcd *hcd, int portnum)
985 {
986 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
987 u32 __iomem *reg;
988
989 if (ehci_is_TDI(ehci))
990 return 0;
991 reg = &ehci->regs->port_status[portnum - 1];
992 return ehci_readl(ehci, reg) & PORT_OWNER;
993 }
Linux kernel - Deliverables
This page took 0.051119 seconds and 6 git commands to generate.