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isdn: gigaset: use after free
[linux-2.6/btrfs-unstable.git] / drivers / usb / host / ehci-hub.c
blobe7d3d8def282968191e2bddf99109b00504c97e1
1 /*
2 * Copyright (C) 2001-2004 by David Brownell
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the
6 * Free Software Foundation; either version 2 of the License, or (at your
7 * option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
11 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software Foundation,
16 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17 */
18
19 /* this file is part of ehci-hcd.c */
20
21 /*-------------------------------------------------------------------------*/
22
23 /*
24 * EHCI Root Hub ... the nonsharable stuff
25 *
26 * Registers don't need cpu_to_le32, that happens transparently
27 */
28
29 /*-------------------------------------------------------------------------*/
30
31 #define PORT_WAKE_BITS (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
32
33 #ifdef CONFIG_PM
34
35 static int ehci_hub_control(
36 struct usb_hcd *hcd,
37 u16 typeReq,
38 u16 wValue,
39 u16 wIndex,
40 char *buf,
41 u16 wLength
42 );
43
44 /* After a power loss, ports that were owned by the companion must be
45 * reset so that the companion can still own them.
46 */
47 static void ehci_handover_companion_ports(struct ehci_hcd *ehci)
48 {
49 u32 __iomem *reg;
50 u32 status;
51 int port;
52 __le32 buf;
53 struct usb_hcd *hcd = ehci_to_hcd(ehci);
54
55 if (!ehci->owned_ports)
56 return;
57
58 /* Give the connections some time to appear */
59 msleep(20);
60
61 port = HCS_N_PORTS(ehci->hcs_params);
62 while (port--) {
63 if (test_bit(port, &ehci->owned_ports)) {
64 reg = &ehci->regs->port_status[port];
65 status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
66
67 /* Port already owned by companion? */
68 if (status & PORT_OWNER)
69 clear_bit(port, &ehci->owned_ports);
70 else if (test_bit(port, &ehci->companion_ports))
71 ehci_writel(ehci, status & ~PORT_PE, reg);
72 else
73 ehci_hub_control(hcd, SetPortFeature,
74 USB_PORT_FEAT_RESET, port + 1,
75 NULL, 0);
76 }
77 }
78
79 if (!ehci->owned_ports)
80 return;
81 msleep(90); /* Wait for resets to complete */
82
83 port = HCS_N_PORTS(ehci->hcs_params);
84 while (port--) {
85 if (test_bit(port, &ehci->owned_ports)) {
86 ehci_hub_control(hcd, GetPortStatus,
87 0, port + 1,
88 (char *) &buf, sizeof(buf));
89
90 /* The companion should now own the port,
91 * but if something went wrong the port must not
92 * remain enabled.
93 */
94 reg = &ehci->regs->port_status[port];
95 status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
96 if (status & PORT_OWNER)
97 ehci_writel(ehci, status | PORT_CSC, reg);
98 else {
99 ehci_dbg(ehci, "failed handover port %d: %x\n",
100 port + 1, status);
101 ehci_writel(ehci, status & ~PORT_PE, reg);
102 }
103 }
104 }
105
106 ehci->owned_ports = 0;
107 }
108
109 static void ehci_adjust_port_wakeup_flags(struct ehci_hcd *ehci,
110 bool suspending)
111 {
112 int port;
113 u32 temp;
114
115 /* If remote wakeup is enabled for the root hub but disabled
116 * for the controller, we must adjust all the port wakeup flags
117 * when the controller is suspended or resumed. In all other
118 * cases they don't need to be changed.
119 */
120 if (!ehci_to_hcd(ehci)->self.root_hub->do_remote_wakeup ||
121 device_may_wakeup(ehci_to_hcd(ehci)->self.controller))
122 return;
123
124 /* clear phy low-power mode before changing wakeup flags */
125 if (ehci->has_hostpc) {
126 port = HCS_N_PORTS(ehci->hcs_params);
127 while (port--) {
128 u32 __iomem *hostpc_reg;
129
130 hostpc_reg = (u32 __iomem *)((u8 *) ehci->regs
131 + HOSTPC0 + 4 * port);
132 temp = ehci_readl(ehci, hostpc_reg);
133 ehci_writel(ehci, temp & ~HOSTPC_PHCD, hostpc_reg);
134 }
135 msleep(5);
136 }
137
138 port = HCS_N_PORTS(ehci->hcs_params);
139 while (port--) {
140 u32 __iomem *reg = &ehci->regs->port_status[port];
141 u32 t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
142 u32 t2 = t1 & ~PORT_WAKE_BITS;
143
144 /* If we are suspending the controller, clear the flags.
145 * If we are resuming the controller, set the wakeup flags.
146 */
147 if (!suspending) {
148 if (t1 & PORT_CONNECT)
149 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
150 else
151 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
152 }
153 ehci_vdbg(ehci, "port %d, %08x -> %08x\n",
154 port + 1, t1, t2);
155 ehci_writel(ehci, t2, reg);
156 }
157
158 /* enter phy low-power mode again */
159 if (ehci->has_hostpc) {
160 port = HCS_N_PORTS(ehci->hcs_params);
161 while (port--) {
162 u32 __iomem *hostpc_reg;
163
164 hostpc_reg = (u32 __iomem *)((u8 *) ehci->regs
165 + HOSTPC0 + 4 * port);
166 temp = ehci_readl(ehci, hostpc_reg);
167 ehci_writel(ehci, temp | HOSTPC_PHCD, hostpc_reg);
168 }
169 }
170 }
171
172 static int ehci_bus_suspend (struct usb_hcd *hcd)
173 {
174 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
175 int port;
176 int mask;
177 int changed;
178
179 ehci_dbg(ehci, "suspend root hub\n");
180
181 if (time_before (jiffies, ehci->next_statechange))
182 msleep(5);
183 del_timer_sync(&ehci->watchdog);
184 del_timer_sync(&ehci->iaa_watchdog);
185
186 spin_lock_irq (&ehci->lock);
187
188 /* Once the controller is stopped, port resumes that are already
189 * in progress won't complete. Hence if remote wakeup is enabled
190 * for the root hub and any ports are in the middle of a resume or
191 * remote wakeup, we must fail the suspend.
192 */
193 if (hcd->self.root_hub->do_remote_wakeup) {
194 port = HCS_N_PORTS(ehci->hcs_params);
195 while (port--) {
196 if (ehci->reset_done[port] != 0) {
197 spin_unlock_irq(&ehci->lock);
198 ehci_dbg(ehci, "suspend failed because "
199 "port %d is resuming\n",
200 port + 1);
201 return -EBUSY;
202 }
203 }
204 }
205
206 /* stop schedules, clean any completed work */
207 if (HC_IS_RUNNING(hcd->state)) {
208 ehci_quiesce (ehci);
209 hcd->state = HC_STATE_QUIESCING;
210 }
211 ehci->command = ehci_readl(ehci, &ehci->regs->command);
212 ehci_work(ehci);
213
214 /* Unlike other USB host controller types, EHCI doesn't have
215 * any notion of "global" or bus-wide suspend. The driver has
216 * to manually suspend all the active unsuspended ports, and
217 * then manually resume them in the bus_resume() routine.
218 */
219 ehci->bus_suspended = 0;
220 ehci->owned_ports = 0;
221 changed = 0;
222 port = HCS_N_PORTS(ehci->hcs_params);
223 while (port--) {
224 u32 __iomem *reg = &ehci->regs->port_status [port];
225 u32 t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
226 u32 t2 = t1 & ~PORT_WAKE_BITS;
227
228 /* keep track of which ports we suspend */
229 if (t1 & PORT_OWNER)
230 set_bit(port, &ehci->owned_ports);
231 else if ((t1 & PORT_PE) && !(t1 & PORT_SUSPEND)) {
232 t2 |= PORT_SUSPEND;
233 set_bit(port, &ehci->bus_suspended);
234 }
235
236 /* enable remote wakeup on all ports, if told to do so */
237 if (hcd->self.root_hub->do_remote_wakeup) {
238 /* only enable appropriate wake bits, otherwise the
239 * hardware can not go phy low power mode. If a race
240 * condition happens here(connection change during bits
241 * set), the port change detection will finally fix it.
242 */
243 if (t1 & PORT_CONNECT)
244 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
245 else
246 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
247 }
248
249 if (t1 != t2) {
250 ehci_vdbg (ehci, "port %d, %08x -> %08x\n",
251 port + 1, t1, t2);
252 ehci_writel(ehci, t2, reg);
253 changed = 1;
254 }
255 }
256
257 if (changed && ehci->has_hostpc) {
258 spin_unlock_irq(&ehci->lock);
259 msleep(5); /* 5 ms for HCD to enter low-power mode */
260 spin_lock_irq(&ehci->lock);
261
262 port = HCS_N_PORTS(ehci->hcs_params);
263 while (port--) {
264 u32 __iomem *hostpc_reg;
265 u32 t3;
266
267 hostpc_reg = (u32 __iomem *)((u8 *) ehci->regs
268 + HOSTPC0 + 4 * port);
269 t3 = ehci_readl(ehci, hostpc_reg);
270 ehci_writel(ehci, t3 | HOSTPC_PHCD, hostpc_reg);
271 t3 = ehci_readl(ehci, hostpc_reg);
272 ehci_dbg(ehci, "Port %d phy low-power mode %s\n",
273 port, (t3 & HOSTPC_PHCD) ?
274 "succeeded" : "failed");
275 }
276 }
277
278 /* Apparently some devices need a >= 1-uframe delay here */
279 if (ehci->bus_suspended)
280 udelay(150);
281
282 /* turn off now-idle HC */
283 ehci_halt (ehci);
284 hcd->state = HC_STATE_SUSPENDED;
285
286 if (ehci->reclaim)
287 end_unlink_async(ehci);
288
289 /* allow remote wakeup */
290 mask = INTR_MASK;
291 if (!hcd->self.root_hub->do_remote_wakeup)
292 mask &= ~STS_PCD;
293 ehci_writel(ehci, mask, &ehci->regs->intr_enable);
294 ehci_readl(ehci, &ehci->regs->intr_enable);
295
296 ehci->next_statechange = jiffies + msecs_to_jiffies(10);
297 spin_unlock_irq (&ehci->lock);
298
299 /* ehci_work() may have re-enabled the watchdog timer, which we do not
300 * want, and so we must delete any pending watchdog timer events.
301 */
302 del_timer_sync(&ehci->watchdog);
303 return 0;
304 }
305
306
307 /* caller has locked the root hub, and should reset/reinit on error */
308 static int ehci_bus_resume (struct usb_hcd *hcd)
309 {
310 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
311 u32 temp;
312 u32 power_okay;
313 int i;
314 u8 resume_needed = 0;
315
316 if (time_before (jiffies, ehci->next_statechange))
317 msleep(5);
318 spin_lock_irq (&ehci->lock);
319 if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
320 spin_unlock_irq(&ehci->lock);
321 return -ESHUTDOWN;
322 }
323
324 if (unlikely(ehci->debug)) {
325 if (!dbgp_reset_prep())
326 ehci->debug = NULL;
327 else
328 dbgp_external_startup();
329 }
330
331 /* Ideally and we've got a real resume here, and no port's power
332 * was lost. (For PCI, that means Vaux was maintained.) But we
333 * could instead be restoring a swsusp snapshot -- so that BIOS was
334 * the last user of the controller, not reset/pm hardware keeping
335 * state we gave to it.
336 */
337 power_okay = ehci_readl(ehci, &ehci->regs->intr_enable);
338 ehci_dbg(ehci, "resume root hub%s\n",
339 power_okay ? "" : " after power loss");
340
341 /* at least some APM implementations will try to deliver
342 * IRQs right away, so delay them until we're ready.
343 */
344 ehci_writel(ehci, 0, &ehci->regs->intr_enable);
345
346 /* re-init operational registers */
347 ehci_writel(ehci, 0, &ehci->regs->segment);
348 ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
349 ehci_writel(ehci, (u32) ehci->async->qh_dma, &ehci->regs->async_next);
350
351 /* restore CMD_RUN, framelist size, and irq threshold */
352 ehci_writel(ehci, ehci->command, &ehci->regs->command);
353
354 /* Some controller/firmware combinations need a delay during which
355 * they set up the port statuses. See Bugzilla #8190. */
356 spin_unlock_irq(&ehci->lock);
357 msleep(8);
358 spin_lock_irq(&ehci->lock);
359
360 /* clear phy low-power mode before resume */
361 if (ehci->bus_suspended && ehci->has_hostpc) {
362 i = HCS_N_PORTS(ehci->hcs_params);
363 while (i--) {
364 if (test_bit(i, &ehci->bus_suspended)) {
365 u32 __iomem *hostpc_reg;
366
367 hostpc_reg = (u32 __iomem *)((u8 *) ehci->regs
368 + HOSTPC0 + 4 * i);
369 temp = ehci_readl(ehci, hostpc_reg);
370 ehci_writel(ehci, temp & ~HOSTPC_PHCD,
371 hostpc_reg);
372 }
373 }
374 spin_unlock_irq(&ehci->lock);
375 msleep(5);
376 spin_lock_irq(&ehci->lock);
377 }
378
379 /* manually resume the ports we suspended during bus_suspend() */
380 i = HCS_N_PORTS (ehci->hcs_params);
381 while (i--) {
382 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
383 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
384 if (test_bit(i, &ehci->bus_suspended) &&
385 (temp & PORT_SUSPEND)) {
386 temp |= PORT_RESUME;
387 resume_needed = 1;
388 }
389 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
390 }
391
392 /* msleep for 20ms only if code is trying to resume port */
393 if (resume_needed) {
394 spin_unlock_irq(&ehci->lock);
395 msleep(20);
396 spin_lock_irq(&ehci->lock);
397 }
398
399 i = HCS_N_PORTS (ehci->hcs_params);
400 while (i--) {
401 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
402 if (test_bit(i, &ehci->bus_suspended) &&
403 (temp & PORT_SUSPEND)) {
404 temp &= ~(PORT_RWC_BITS | PORT_RESUME);
405 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
406 ehci_vdbg (ehci, "resumed port %d\n", i + 1);
407 }
408 }
409 (void) ehci_readl(ehci, &ehci->regs->command);
410
411 /* maybe re-activate the schedule(s) */
412 temp = 0;
413 if (ehci->async->qh_next.qh)
414 temp |= CMD_ASE;
415 if (ehci->periodic_sched)
416 temp |= CMD_PSE;
417 if (temp) {
418 ehci->command |= temp;
419 ehci_writel(ehci, ehci->command, &ehci->regs->command);
420 }
421
422 ehci->next_statechange = jiffies + msecs_to_jiffies(5);
423 hcd->state = HC_STATE_RUNNING;
424
425 /* Now we can safely re-enable irqs */
426 ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
427
428 spin_unlock_irq (&ehci->lock);
429 ehci_handover_companion_ports(ehci);
430 return 0;
431 }
432
433 #else
434
435 #define ehci_bus_suspend NULL
436 #define ehci_bus_resume NULL
437
438 #endif /* CONFIG_PM */
439
440 /*-------------------------------------------------------------------------*/
441
442 /* Display the ports dedicated to the companion controller */
443 static ssize_t show_companion(struct device *dev,
444 struct device_attribute *attr,
445 char *buf)
446 {
447 struct ehci_hcd *ehci;
448 int nports, index, n;
449 int count = PAGE_SIZE;
450 char *ptr = buf;
451
452 ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
453 nports = HCS_N_PORTS(ehci->hcs_params);
454
455 for (index = 0; index < nports; ++index) {
456 if (test_bit(index, &ehci->companion_ports)) {
457 n = scnprintf(ptr, count, "%d\n", index + 1);
458 ptr += n;
459 count -= n;
460 }
461 }
462 return ptr - buf;
463 }
464
465 /*
466 * Sets the owner of a port
467 */
468 static void set_owner(struct ehci_hcd *ehci, int portnum, int new_owner)
469 {
470 u32 __iomem *status_reg;
471 u32 port_status;
472 int try;
473
474 status_reg = &ehci->regs->port_status[portnum];
475
476 /*
477 * The controller won't set the OWNER bit if the port is
478 * enabled, so this loop will sometimes require at least two
479 * iterations: one to disable the port and one to set OWNER.
480 */
481 for (try = 4; try > 0; --try) {
482 spin_lock_irq(&ehci->lock);
483 port_status = ehci_readl(ehci, status_reg);
484 if ((port_status & PORT_OWNER) == new_owner
485 || (port_status & (PORT_OWNER | PORT_CONNECT))
486 == 0)
487 try = 0;
488 else {
489 port_status ^= PORT_OWNER;
490 port_status &= ~(PORT_PE | PORT_RWC_BITS);
491 ehci_writel(ehci, port_status, status_reg);
492 }
493 spin_unlock_irq(&ehci->lock);
494 if (try > 1)
495 msleep(5);
496 }
497 }
498
499 /*
500 * Dedicate or undedicate a port to the companion controller.
501 * Syntax is "[-]portnum", where a leading '-' sign means
502 * return control of the port to the EHCI controller.
503 */
504 static ssize_t store_companion(struct device *dev,
505 struct device_attribute *attr,
506 const char *buf, size_t count)
507 {
508 struct ehci_hcd *ehci;
509 int portnum, new_owner;
510
511 ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
512 new_owner = PORT_OWNER; /* Owned by companion */
513 if (sscanf(buf, "%d", &portnum) != 1)
514 return -EINVAL;
515 if (portnum < 0) {
516 portnum = - portnum;
517 new_owner = 0; /* Owned by EHCI */
518 }
519 if (portnum <= 0 || portnum > HCS_N_PORTS(ehci->hcs_params))
520 return -ENOENT;
521 portnum--;
522 if (new_owner)
523 set_bit(portnum, &ehci->companion_ports);
524 else
525 clear_bit(portnum, &ehci->companion_ports);
526 set_owner(ehci, portnum, new_owner);
527 return count;
528 }
529 static DEVICE_ATTR(companion, 0644, show_companion, store_companion);
530
531 static inline void create_companion_file(struct ehci_hcd *ehci)
532 {
533 int i;
534
535 /* with integrated TT there is no companion! */
536 if (!ehci_is_TDI(ehci))
537 i = device_create_file(ehci_to_hcd(ehci)->self.controller,
538 &dev_attr_companion);
539 }
540
541 static inline void remove_companion_file(struct ehci_hcd *ehci)
542 {
543 /* with integrated TT there is no companion! */
544 if (!ehci_is_TDI(ehci))
545 device_remove_file(ehci_to_hcd(ehci)->self.controller,
546 &dev_attr_companion);
547 }
548
549
550 /*-------------------------------------------------------------------------*/
551
552 static int check_reset_complete (
553 struct ehci_hcd *ehci,
554 int index,
555 u32 __iomem *status_reg,
556 int port_status
557 ) {
558 if (!(port_status & PORT_CONNECT))
559 return port_status;
560
561 /* if reset finished and it's still not enabled -- handoff */
562 if (!(port_status & PORT_PE)) {
563
564 /* with integrated TT, there's nobody to hand it to! */
565 if (ehci_is_TDI(ehci)) {
566 ehci_dbg (ehci,
567 "Failed to enable port %d on root hub TT\n",
568 index+1);
569 return port_status;
570 }
571
572 ehci_dbg (ehci, "port %d full speed --> companion\n",
573 index + 1);
574
575 // what happens if HCS_N_CC(params) == 0 ?
576 port_status |= PORT_OWNER;
577 port_status &= ~PORT_RWC_BITS;
578 ehci_writel(ehci, port_status, status_reg);
579
580 /* ensure 440EPX ohci controller state is operational */
581 if (ehci->has_amcc_usb23)
582 set_ohci_hcfs(ehci, 1);
583 } else {
584 ehci_dbg (ehci, "port %d high speed\n", index + 1);
585 /* ensure 440EPx ohci controller state is suspended */
586 if (ehci->has_amcc_usb23)
587 set_ohci_hcfs(ehci, 0);
588 }
589
590 return port_status;
591 }
592
593 /*-------------------------------------------------------------------------*/
594
595
596 /* build "status change" packet (one or two bytes) from HC registers */
597
598 static int
599 ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
600 {
601 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
602 u32 temp, status = 0;
603 u32 mask;
604 int ports, i, retval = 1;
605 unsigned long flags;
606
607 /* if !USB_SUSPEND, root hub timers won't get shut down ... */
608 if (!HC_IS_RUNNING(hcd->state))
609 return 0;
610
611 /* init status to no-changes */
612 buf [0] = 0;
613 ports = HCS_N_PORTS (ehci->hcs_params);
614 if (ports > 7) {
615 buf [1] = 0;
616 retval++;
617 }
618
619 /* Some boards (mostly VIA?) report bogus overcurrent indications,
620 * causing massive log spam unless we completely ignore them. It
621 * may be relevant that VIA VT8235 controllers, where PORT_POWER is
622 * always set, seem to clear PORT_OCC and PORT_CSC when writing to
623 * PORT_POWER; that's surprising, but maybe within-spec.
624 */
625 if (!ignore_oc)
626 mask = PORT_CSC | PORT_PEC | PORT_OCC;
627 else
628 mask = PORT_CSC | PORT_PEC;
629 // PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
630
631 /* no hub change reports (bit 0) for now (power, ...) */
632
633 /* port N changes (bit N)? */
634 spin_lock_irqsave (&ehci->lock, flags);
635 for (i = 0; i < ports; i++) {
636 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
637
638 /*
639 * Return status information even for ports with OWNER set.
640 * Otherwise khubd wouldn't see the disconnect event when a
641 * high-speed device is switched over to the companion
642 * controller by the user.
643 */
644
645 if ((temp & mask) != 0 || test_bit(i, &ehci->port_c_suspend)
646 || (ehci->reset_done[i] && time_after_eq(
647 jiffies, ehci->reset_done[i]))) {
648 if (i < 7)
649 buf [0] |= 1 << (i + 1);
650 else
651 buf [1] |= 1 << (i - 7);
652 status = STS_PCD;
653 }
654 }
655 /* FIXME autosuspend idle root hubs */
656 spin_unlock_irqrestore (&ehci->lock, flags);
657 return status ? retval : 0;
658 }
659
660 /*-------------------------------------------------------------------------*/
661
662 static void
663 ehci_hub_descriptor (
664 struct ehci_hcd *ehci,
665 struct usb_hub_descriptor *desc
666 ) {
667 int ports = HCS_N_PORTS (ehci->hcs_params);
668 u16 temp;
669
670 desc->bDescriptorType = 0x29;
671 desc->bPwrOn2PwrGood = 10; /* ehci 1.0, 2.3.9 says 20ms max */
672 desc->bHubContrCurrent = 0;
673
674 desc->bNbrPorts = ports;
675 temp = 1 + (ports / 8);
676 desc->bDescLength = 7 + 2 * temp;
677
678 /* two bitmaps: ports removable, and usb 1.0 legacy PortPwrCtrlMask */
679 memset (&desc->bitmap [0], 0, temp);
680 memset (&desc->bitmap [temp], 0xff, temp);
681
682 temp = 0x0008; /* per-port overcurrent reporting */
683 if (HCS_PPC (ehci->hcs_params))
684 temp |= 0x0001; /* per-port power control */
685 else
686 temp |= 0x0002; /* no power switching */
687 #if 0
688 // re-enable when we support USB_PORT_FEAT_INDICATOR below.
689 if (HCS_INDICATOR (ehci->hcs_params))
690 temp |= 0x0080; /* per-port indicators (LEDs) */
691 #endif
692 desc->wHubCharacteristics = cpu_to_le16(temp);
693 }
694
695 /*-------------------------------------------------------------------------*/
696
697 static int ehci_hub_control (
698 struct usb_hcd *hcd,
699 u16 typeReq,
700 u16 wValue,
701 u16 wIndex,
702 char *buf,
703 u16 wLength
704 ) {
705 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
706 int ports = HCS_N_PORTS (ehci->hcs_params);
707 u32 __iomem *status_reg = &ehci->regs->port_status[
708 (wIndex & 0xff) - 1];
709 u32 __iomem *hostpc_reg = NULL;
710 u32 temp, temp1, status;
711 unsigned long flags;
712 int retval = 0;
713 unsigned selector;
714
715 /*
716 * FIXME: support SetPortFeatures USB_PORT_FEAT_INDICATOR.
717 * HCS_INDICATOR may say we can change LEDs to off/amber/green.
718 * (track current state ourselves) ... blink for diagnostics,
719 * power, "this is the one", etc. EHCI spec supports this.
720 */
721
722 if (ehci->has_hostpc)
723 hostpc_reg = (u32 __iomem *)((u8 *)ehci->regs
724 + HOSTPC0 + 4 * ((wIndex & 0xff) - 1));
725 spin_lock_irqsave (&ehci->lock, flags);
726 switch (typeReq) {
727 case ClearHubFeature:
728 switch (wValue) {
729 case C_HUB_LOCAL_POWER:
730 case C_HUB_OVER_CURRENT:
731 /* no hub-wide feature/status flags */
732 break;
733 default:
734 goto error;
735 }
736 break;
737 case ClearPortFeature:
738 if (!wIndex || wIndex > ports)
739 goto error;
740 wIndex--;
741 temp = ehci_readl(ehci, status_reg);
742
743 /*
744 * Even if OWNER is set, so the port is owned by the
745 * companion controller, khubd needs to be able to clear
746 * the port-change status bits (especially
747 * USB_PORT_STAT_C_CONNECTION).
748 */
749
750 switch (wValue) {
751 case USB_PORT_FEAT_ENABLE:
752 ehci_writel(ehci, temp & ~PORT_PE, status_reg);
753 break;
754 case USB_PORT_FEAT_C_ENABLE:
755 ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_PEC,
756 status_reg);
757 break;
758 case USB_PORT_FEAT_SUSPEND:
759 if (temp & PORT_RESET)
760 goto error;
761 if (ehci->no_selective_suspend)
762 break;
763 if (!(temp & PORT_SUSPEND))
764 break;
765 if ((temp & PORT_PE) == 0)
766 goto error;
767
768 /* clear phy low-power mode before resume */
769 if (hostpc_reg) {
770 temp1 = ehci_readl(ehci, hostpc_reg);
771 ehci_writel(ehci, temp1 & ~HOSTPC_PHCD,
772 hostpc_reg);
773 spin_unlock_irqrestore(&ehci->lock, flags);
774 msleep(5);/* wait to leave low-power mode */
775 spin_lock_irqsave(&ehci->lock, flags);
776 }
777 /* resume signaling for 20 msec */
778 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
779 ehci_writel(ehci, temp | PORT_RESUME, status_reg);
780 ehci->reset_done[wIndex] = jiffies
781 + msecs_to_jiffies(20);
782 break;
783 case USB_PORT_FEAT_C_SUSPEND:
784 clear_bit(wIndex, &ehci->port_c_suspend);
785 break;
786 case USB_PORT_FEAT_POWER:
787 if (HCS_PPC (ehci->hcs_params))
788 ehci_writel(ehci,
789 temp & ~(PORT_RWC_BITS | PORT_POWER),
790 status_reg);
791 break;
792 case USB_PORT_FEAT_C_CONNECTION:
793 ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_CSC,
794 status_reg);
795 break;
796 case USB_PORT_FEAT_C_OVER_CURRENT:
797 ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_OCC,
798 status_reg);
799 break;
800 case USB_PORT_FEAT_C_RESET:
801 /* GetPortStatus clears reset */
802 break;
803 default:
804 goto error;
805 }
806 ehci_readl(ehci, &ehci->regs->command); /* unblock posted write */
807 break;
808 case GetHubDescriptor:
809 ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
810 buf);
811 break;
812 case GetHubStatus:
813 /* no hub-wide feature/status flags */
814 memset (buf, 0, 4);
815 //cpu_to_le32s ((u32 *) buf);
816 break;
817 case GetPortStatus:
818 if (!wIndex || wIndex > ports)
819 goto error;
820 wIndex--;
821 status = 0;
822 temp = ehci_readl(ehci, status_reg);
823
824 // wPortChange bits
825 if (temp & PORT_CSC)
826 status |= USB_PORT_STAT_C_CONNECTION << 16;
827 if (temp & PORT_PEC)
828 status |= USB_PORT_STAT_C_ENABLE << 16;
829
830 if ((temp & PORT_OCC) && !ignore_oc){
831 status |= USB_PORT_STAT_C_OVERCURRENT << 16;
832
833 /*
834 * Hubs should disable port power on over-current.
835 * However, not all EHCI implementations do this
836 * automatically, even if they _do_ support per-port
837 * power switching; they're allowed to just limit the
838 * current. khubd will turn the power back on.
839 */
840 if (HCS_PPC (ehci->hcs_params)){
841 ehci_writel(ehci,
842 temp & ~(PORT_RWC_BITS | PORT_POWER),
843 status_reg);
844 }
845 }
846
847 /* whoever resumes must GetPortStatus to complete it!! */
848 if (temp & PORT_RESUME) {
849
850 /* Remote Wakeup received? */
851 if (!ehci->reset_done[wIndex]) {
852 /* resume signaling for 20 msec */
853 ehci->reset_done[wIndex] = jiffies
854 + msecs_to_jiffies(20);
855 /* check the port again */
856 mod_timer(&ehci_to_hcd(ehci)->rh_timer,
857 ehci->reset_done[wIndex]);
858 }
859
860 /* resume completed? */
861 else if (time_after_eq(jiffies,
862 ehci->reset_done[wIndex])) {
863 clear_bit(wIndex, &ehci->suspended_ports);
864 set_bit(wIndex, &ehci->port_c_suspend);
865 ehci->reset_done[wIndex] = 0;
866
867 /* stop resume signaling */
868 temp = ehci_readl(ehci, status_reg);
869 ehci_writel(ehci,
870 temp & ~(PORT_RWC_BITS | PORT_RESUME),
871 status_reg);
872 retval = handshake(ehci, status_reg,
873 PORT_RESUME, 0, 2000 /* 2msec */);
874 if (retval != 0) {
875 ehci_err(ehci,
876 "port %d resume error %d\n",
877 wIndex + 1, retval);
878 goto error;
879 }
880 temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10));
881 }
882 }
883
884 /* whoever resets must GetPortStatus to complete it!! */
885 if ((temp & PORT_RESET)
886 && time_after_eq(jiffies,
887 ehci->reset_done[wIndex])) {
888 status |= USB_PORT_STAT_C_RESET << 16;
889 ehci->reset_done [wIndex] = 0;
890
891 /* force reset to complete */
892 ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESET),
893 status_reg);
894 /* REVISIT: some hardware needs 550+ usec to clear
895 * this bit; seems too long to spin routinely...
896 */
897 retval = handshake(ehci, status_reg,
898 PORT_RESET, 0, 1000);
899 if (retval != 0) {
900 ehci_err (ehci, "port %d reset error %d\n",
901 wIndex + 1, retval);
902 goto error;
903 }
904
905 /* see what we found out */
906 temp = check_reset_complete (ehci, wIndex, status_reg,
907 ehci_readl(ehci, status_reg));
908 }
909
910 if (!(temp & (PORT_RESUME|PORT_RESET)))
911 ehci->reset_done[wIndex] = 0;
912
913 /* transfer dedicated ports to the companion hc */
914 if ((temp & PORT_CONNECT) &&
915 test_bit(wIndex, &ehci->companion_ports)) {
916 temp &= ~PORT_RWC_BITS;
917 temp |= PORT_OWNER;
918 ehci_writel(ehci, temp, status_reg);
919 ehci_dbg(ehci, "port %d --> companion\n", wIndex + 1);
920 temp = ehci_readl(ehci, status_reg);
921 }
922
923 /*
924 * Even if OWNER is set, there's no harm letting khubd
925 * see the wPortStatus values (they should all be 0 except
926 * for PORT_POWER anyway).
927 */
928
929 if (temp & PORT_CONNECT) {
930 status |= USB_PORT_STAT_CONNECTION;
931 // status may be from integrated TT
932 if (ehci->has_hostpc) {
933 temp1 = ehci_readl(ehci, hostpc_reg);
934 status |= ehci_port_speed(ehci, temp1);
935 } else
936 status |= ehci_port_speed(ehci, temp);
937 }
938 if (temp & PORT_PE)
939 status |= USB_PORT_STAT_ENABLE;
940
941 /* maybe the port was unsuspended without our knowledge */
942 if (temp & (PORT_SUSPEND|PORT_RESUME)) {
943 status |= USB_PORT_STAT_SUSPEND;
944 } else if (test_bit(wIndex, &ehci->suspended_ports)) {
945 clear_bit(wIndex, &ehci->suspended_ports);
946 ehci->reset_done[wIndex] = 0;
947 if (temp & PORT_PE)
948 set_bit(wIndex, &ehci->port_c_suspend);
949 }
950
951 if (temp & PORT_OC)
952 status |= USB_PORT_STAT_OVERCURRENT;
953 if (temp & PORT_RESET)
954 status |= USB_PORT_STAT_RESET;
955 if (temp & PORT_POWER)
956 status |= USB_PORT_STAT_POWER;
957 if (test_bit(wIndex, &ehci->port_c_suspend))
958 status |= USB_PORT_STAT_C_SUSPEND << 16;
959
960 #ifndef VERBOSE_DEBUG
961 if (status & ~0xffff) /* only if wPortChange is interesting */
962 #endif
963 dbg_port (ehci, "GetStatus", wIndex + 1, temp);
964 put_unaligned_le32(status, buf);
965 break;
966 case SetHubFeature:
967 switch (wValue) {
968 case C_HUB_LOCAL_POWER:
969 case C_HUB_OVER_CURRENT:
970 /* no hub-wide feature/status flags */
971 break;
972 default:
973 goto error;
974 }
975 break;
976 case SetPortFeature:
977 selector = wIndex >> 8;
978 wIndex &= 0xff;
979 if (unlikely(ehci->debug)) {
980 /* If the debug port is active any port
981 * feature requests should get denied */
982 if (wIndex == HCS_DEBUG_PORT(ehci->hcs_params) &&
983 (readl(&ehci->debug->control) & DBGP_ENABLED)) {
984 retval = -ENODEV;
985 goto error_exit;
986 }
987 }
988 if (!wIndex || wIndex > ports)
989 goto error;
990 wIndex--;
991 temp = ehci_readl(ehci, status_reg);
992 if (temp & PORT_OWNER)
993 break;
994
995 temp &= ~PORT_RWC_BITS;
996 switch (wValue) {
997 case USB_PORT_FEAT_SUSPEND:
998 if (ehci->no_selective_suspend)
999 break;
1000 if ((temp & PORT_PE) == 0
1001 || (temp & PORT_RESET) != 0)
1002 goto error;
1003
1004 /* After above check the port must be connected.
1005 * Set appropriate bit thus could put phy into low power
1006 * mode if we have hostpc feature
1007 */
1008 temp &= ~PORT_WKCONN_E;
1009 temp |= PORT_WKDISC_E | PORT_WKOC_E;
1010 ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
1011 if (hostpc_reg) {
1012 spin_unlock_irqrestore(&ehci->lock, flags);
1013 msleep(5);/* 5ms for HCD enter low pwr mode */
1014 spin_lock_irqsave(&ehci->lock, flags);
1015 temp1 = ehci_readl(ehci, hostpc_reg);
1016 ehci_writel(ehci, temp1 | HOSTPC_PHCD,
1017 hostpc_reg);
1018 temp1 = ehci_readl(ehci, hostpc_reg);
1019 ehci_dbg(ehci, "Port%d phy low pwr mode %s\n",
1020 wIndex, (temp1 & HOSTPC_PHCD) ?
1021 "succeeded" : "failed");
1022 }
1023 set_bit(wIndex, &ehci->suspended_ports);
1024 break;
1025 case USB_PORT_FEAT_POWER:
1026 if (HCS_PPC (ehci->hcs_params))
1027 ehci_writel(ehci, temp | PORT_POWER,
1028 status_reg);
1029 break;
1030 case USB_PORT_FEAT_RESET:
1031 if (temp & PORT_RESUME)
1032 goto error;
1033 /* line status bits may report this as low speed,
1034 * which can be fine if this root hub has a
1035 * transaction translator built in.
1036 */
1037 if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
1038 && !ehci_is_TDI(ehci)
1039 && PORT_USB11 (temp)) {
1040 ehci_dbg (ehci,
1041 "port %d low speed --> companion\n",
1042 wIndex + 1);
1043 temp |= PORT_OWNER;
1044 } else {
1045 ehci_vdbg (ehci, "port %d reset\n", wIndex + 1);
1046 temp |= PORT_RESET;
1047 temp &= ~PORT_PE;
1048
1049 /*
1050 * caller must wait, then call GetPortStatus
1051 * usb 2.0 spec says 50 ms resets on root
1052 */
1053 ehci->reset_done [wIndex] = jiffies
1054 + msecs_to_jiffies (50);
1055 }
1056 ehci_writel(ehci, temp, status_reg);
1057 break;
1058
1059 /* For downstream facing ports (these): one hub port is put
1060 * into test mode according to USB2 11.24.2.13, then the hub
1061 * must be reset (which for root hub now means rmmod+modprobe,
1062 * or else system reboot). See EHCI 2.3.9 and 4.14 for info
1063 * about the EHCI-specific stuff.
1064 */
1065 case USB_PORT_FEAT_TEST:
1066 if (!selector || selector > 5)
1067 goto error;
1068 ehci_quiesce(ehci);
1069 ehci_halt(ehci);
1070 temp |= selector << 16;
1071 ehci_writel(ehci, temp, status_reg);
1072 break;
1073
1074 default:
1075 goto error;
1076 }
1077 ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
1078 break;
1079
1080 default:
1081 error:
1082 /* "stall" on error */
1083 retval = -EPIPE;
1084 }
1085 error_exit:
1086 spin_unlock_irqrestore (&ehci->lock, flags);
1087 return retval;
1088 }
1089
1090 static void ehci_relinquish_port(struct usb_hcd *hcd, int portnum)
1091 {
1092 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
1093
1094 if (ehci_is_TDI(ehci))
1095 return;
1096 set_owner(ehci, --portnum, PORT_OWNER);
1097 }
1098
1099 static int ehci_port_handed_over(struct usb_hcd *hcd, int portnum)
1100 {
1101 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
1102 u32 __iomem *reg;
1103
1104 if (ehci_is_TDI(ehci))
1105 return 0;
1106 reg = &ehci->regs->port_status[portnum - 1];
1107 return ehci_readl(ehci, reg) & PORT_OWNER;
1108 }
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