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MIPS: Yosemite, Emma: Fix off-by-two in arcs_cmdline buffer size check
[linux-2.6/linux-mips.git] / drivers / usb / host / ehci-hub.c
blob77bbb2357e478a5e021118076bbe2a7f84811af4
1 /*
2 * Copyright (C) 2001-2004 by David Brownell
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the
6 * Free Software Foundation; either version 2 of the License, or (at your
7 * option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
11 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software Foundation,
16 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17 */
18
19 /* this file is part of ehci-hcd.c */
20
21 /*-------------------------------------------------------------------------*/
22
23 /*
24 * EHCI Root Hub ... the nonsharable stuff
25 *
26 * Registers don't need cpu_to_le32, that happens transparently
27 */
28
29 /*-------------------------------------------------------------------------*/
30 #include <linux/usb/otg.h>
31
32 #define PORT_WAKE_BITS (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
33
34 #ifdef CONFIG_PM
35
36 static int ehci_hub_control(
37 struct usb_hcd *hcd,
38 u16 typeReq,
39 u16 wValue,
40 u16 wIndex,
41 char *buf,
42 u16 wLength
43 );
44
45 /* After a power loss, ports that were owned by the companion must be
46 * reset so that the companion can still own them.
47 */
48 static void ehci_handover_companion_ports(struct ehci_hcd *ehci)
49 {
50 u32 __iomem *reg;
51 u32 status;
52 int port;
53 __le32 buf;
54 struct usb_hcd *hcd = ehci_to_hcd(ehci);
55
56 if (!ehci->owned_ports)
57 return;
58
59 /* Give the connections some time to appear */
60 msleep(20);
61
62 port = HCS_N_PORTS(ehci->hcs_params);
63 while (port--) {
64 if (test_bit(port, &ehci->owned_ports)) {
65 reg = &ehci->regs->port_status[port];
66 status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
67
68 /* Port already owned by companion? */
69 if (status & PORT_OWNER)
70 clear_bit(port, &ehci->owned_ports);
71 else if (test_bit(port, &ehci->companion_ports))
72 ehci_writel(ehci, status & ~PORT_PE, reg);
73 else
74 ehci_hub_control(hcd, SetPortFeature,
75 USB_PORT_FEAT_RESET, port + 1,
76 NULL, 0);
77 }
78 }
79
80 if (!ehci->owned_ports)
81 return;
82 msleep(90); /* Wait for resets to complete */
83
84 port = HCS_N_PORTS(ehci->hcs_params);
85 while (port--) {
86 if (test_bit(port, &ehci->owned_ports)) {
87 ehci_hub_control(hcd, GetPortStatus,
88 0, port + 1,
89 (char *) &buf, sizeof(buf));
90
91 /* The companion should now own the port,
92 * but if something went wrong the port must not
93 * remain enabled.
94 */
95 reg = &ehci->regs->port_status[port];
96 status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
97 if (status & PORT_OWNER)
98 ehci_writel(ehci, status | PORT_CSC, reg);
99 else {
100 ehci_dbg(ehci, "failed handover port %d: %x\n",
101 port + 1, status);
102 ehci_writel(ehci, status & ~PORT_PE, reg);
103 }
104 }
105 }
106
107 ehci->owned_ports = 0;
108 }
109
110 static int ehci_port_change(struct ehci_hcd *ehci)
111 {
112 int i = HCS_N_PORTS(ehci->hcs_params);
113
114 /* First check if the controller indicates a change event */
115
116 if (ehci_readl(ehci, &ehci->regs->status) & STS_PCD)
117 return 1;
118
119 /*
120 * Not all controllers appear to update this while going from D3 to D0,
121 * so check the individual port status registers as well
122 */
123
124 while (i--)
125 if (ehci_readl(ehci, &ehci->regs->port_status[i]) & PORT_CSC)
126 return 1;
127
128 return 0;
129 }
130
131 static __maybe_unused void ehci_adjust_port_wakeup_flags(struct ehci_hcd *ehci,
132 bool suspending, bool do_wakeup)
133 {
134 int port;
135 u32 temp;
136 unsigned long flags;
137
138 /* If remote wakeup is enabled for the root hub but disabled
139 * for the controller, we must adjust all the port wakeup flags
140 * when the controller is suspended or resumed. In all other
141 * cases they don't need to be changed.
142 */
143 if (!ehci_to_hcd(ehci)->self.root_hub->do_remote_wakeup || do_wakeup)
144 return;
145
146 spin_lock_irqsave(&ehci->lock, flags);
147
148 /* clear phy low-power mode before changing wakeup flags */
149 if (ehci->has_hostpc) {
150 port = HCS_N_PORTS(ehci->hcs_params);
151 while (port--) {
152 u32 __iomem *hostpc_reg;
153
154 hostpc_reg = (u32 __iomem *)((u8 *) ehci->regs
155 + HOSTPC0 + 4 * port);
156 temp = ehci_readl(ehci, hostpc_reg);
157 ehci_writel(ehci, temp & ~HOSTPC_PHCD, hostpc_reg);
158 }
159 spin_unlock_irqrestore(&ehci->lock, flags);
160 msleep(5);
161 spin_lock_irqsave(&ehci->lock, flags);
162 }
163
164 port = HCS_N_PORTS(ehci->hcs_params);
165 while (port--) {
166 u32 __iomem *reg = &ehci->regs->port_status[port];
167 u32 t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
168 u32 t2 = t1 & ~PORT_WAKE_BITS;
169
170 /* If we are suspending the controller, clear the flags.
171 * If we are resuming the controller, set the wakeup flags.
172 */
173 if (!suspending) {
174 if (t1 & PORT_CONNECT)
175 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
176 else
177 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
178 }
179 ehci_vdbg(ehci, "port %d, %08x -> %08x\n",
180 port + 1, t1, t2);
181 ehci_writel(ehci, t2, reg);
182 }
183
184 /* enter phy low-power mode again */
185 if (ehci->has_hostpc) {
186 port = HCS_N_PORTS(ehci->hcs_params);
187 while (port--) {
188 u32 __iomem *hostpc_reg;
189
190 hostpc_reg = (u32 __iomem *)((u8 *) ehci->regs
191 + HOSTPC0 + 4 * port);
192 temp = ehci_readl(ehci, hostpc_reg);
193 ehci_writel(ehci, temp | HOSTPC_PHCD, hostpc_reg);
194 }
195 }
196
197 /* Does the root hub have a port wakeup pending? */
198 if (!suspending && ehci_port_change(ehci))
199 usb_hcd_resume_root_hub(ehci_to_hcd(ehci));
200
201 spin_unlock_irqrestore(&ehci->lock, flags);
202 }
203
204 static int ehci_bus_suspend (struct usb_hcd *hcd)
205 {
206 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
207 int port;
208 int mask;
209 int changed;
210
211 ehci_dbg(ehci, "suspend root hub\n");
212
213 if (time_before (jiffies, ehci->next_statechange))
214 msleep(5);
215 del_timer_sync(&ehci->watchdog);
216 del_timer_sync(&ehci->iaa_watchdog);
217
218 spin_lock_irq (&ehci->lock);
219
220 /* Once the controller is stopped, port resumes that are already
221 * in progress won't complete. Hence if remote wakeup is enabled
222 * for the root hub and any ports are in the middle of a resume or
223 * remote wakeup, we must fail the suspend.
224 */
225 if (hcd->self.root_hub->do_remote_wakeup) {
226 port = HCS_N_PORTS(ehci->hcs_params);
227 while (port--) {
228 if (ehci->reset_done[port] != 0) {
229 spin_unlock_irq(&ehci->lock);
230 ehci_dbg(ehci, "suspend failed because "
231 "port %d is resuming\n",
232 port + 1);
233 return -EBUSY;
234 }
235 }
236 }
237
238 /* stop schedules, clean any completed work */
239 if (ehci->rh_state == EHCI_RH_RUNNING)
240 ehci_quiesce (ehci);
241 ehci->command = ehci_readl(ehci, &ehci->regs->command);
242 ehci_work(ehci);
243
244 /* Unlike other USB host controller types, EHCI doesn't have
245 * any notion of "global" or bus-wide suspend. The driver has
246 * to manually suspend all the active unsuspended ports, and
247 * then manually resume them in the bus_resume() routine.
248 */
249 ehci->bus_suspended = 0;
250 ehci->owned_ports = 0;
251 changed = 0;
252 port = HCS_N_PORTS(ehci->hcs_params);
253 while (port--) {
254 u32 __iomem *reg = &ehci->regs->port_status [port];
255 u32 t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
256 u32 t2 = t1 & ~PORT_WAKE_BITS;
257
258 /* keep track of which ports we suspend */
259 if (t1 & PORT_OWNER)
260 set_bit(port, &ehci->owned_ports);
261 else if ((t1 & PORT_PE) && !(t1 & PORT_SUSPEND)) {
262 t2 |= PORT_SUSPEND;
263 set_bit(port, &ehci->bus_suspended);
264 }
265
266 /* enable remote wakeup on all ports, if told to do so */
267 if (hcd->self.root_hub->do_remote_wakeup) {
268 /* only enable appropriate wake bits, otherwise the
269 * hardware can not go phy low power mode. If a race
270 * condition happens here(connection change during bits
271 * set), the port change detection will finally fix it.
272 */
273 if (t1 & PORT_CONNECT)
274 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
275 else
276 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
277 }
278
279 if (t1 != t2) {
280 ehci_vdbg (ehci, "port %d, %08x -> %08x\n",
281 port + 1, t1, t2);
282 ehci_writel(ehci, t2, reg);
283 changed = 1;
284 }
285 }
286
287 if (changed && ehci->has_hostpc) {
288 spin_unlock_irq(&ehci->lock);
289 msleep(5); /* 5 ms for HCD to enter low-power mode */
290 spin_lock_irq(&ehci->lock);
291
292 port = HCS_N_PORTS(ehci->hcs_params);
293 while (port--) {
294 u32 __iomem *hostpc_reg;
295 u32 t3;
296
297 hostpc_reg = (u32 __iomem *)((u8 *) ehci->regs
298 + HOSTPC0 + 4 * port);
299 t3 = ehci_readl(ehci, hostpc_reg);
300 ehci_writel(ehci, t3 | HOSTPC_PHCD, hostpc_reg);
301 t3 = ehci_readl(ehci, hostpc_reg);
302 ehci_dbg(ehci, "Port %d phy low-power mode %s\n",
303 port, (t3 & HOSTPC_PHCD) ?
304 "succeeded" : "failed");
305 }
306 }
307
308 /* Apparently some devices need a >= 1-uframe delay here */
309 if (ehci->bus_suspended)
310 udelay(150);
311
312 /* turn off now-idle HC */
313 ehci_halt (ehci);
314 ehci->rh_state = EHCI_RH_SUSPENDED;
315
316 if (ehci->reclaim)
317 end_unlink_async(ehci);
318
319 /* allow remote wakeup */
320 mask = INTR_MASK;
321 if (!hcd->self.root_hub->do_remote_wakeup)
322 mask &= ~STS_PCD;
323 ehci_writel(ehci, mask, &ehci->regs->intr_enable);
324 ehci_readl(ehci, &ehci->regs->intr_enable);
325
326 ehci->next_statechange = jiffies + msecs_to_jiffies(10);
327 spin_unlock_irq (&ehci->lock);
328
329 /* ehci_work() may have re-enabled the watchdog timer, which we do not
330 * want, and so we must delete any pending watchdog timer events.
331 */
332 del_timer_sync(&ehci->watchdog);
333 return 0;
334 }
335
336
337 /* caller has locked the root hub, and should reset/reinit on error */
338 static int ehci_bus_resume (struct usb_hcd *hcd)
339 {
340 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
341 u32 temp;
342 u32 power_okay;
343 int i;
344 unsigned long resume_needed = 0;
345
346 if (time_before (jiffies, ehci->next_statechange))
347 msleep(5);
348 spin_lock_irq (&ehci->lock);
349 if (!HCD_HW_ACCESSIBLE(hcd)) {
350 spin_unlock_irq(&ehci->lock);
351 return -ESHUTDOWN;
352 }
353
354 if (unlikely(ehci->debug)) {
355 if (!dbgp_reset_prep())
356 ehci->debug = NULL;
357 else
358 dbgp_external_startup();
359 }
360
361 /* Ideally and we've got a real resume here, and no port's power
362 * was lost. (For PCI, that means Vaux was maintained.) But we
363 * could instead be restoring a swsusp snapshot -- so that BIOS was
364 * the last user of the controller, not reset/pm hardware keeping
365 * state we gave to it.
366 */
367 power_okay = ehci_readl(ehci, &ehci->regs->intr_enable);
368 ehci_dbg(ehci, "resume root hub%s\n",
369 power_okay ? "" : " after power loss");
370
371 /* at least some APM implementations will try to deliver
372 * IRQs right away, so delay them until we're ready.
373 */
374 ehci_writel(ehci, 0, &ehci->regs->intr_enable);
375
376 /* re-init operational registers */
377 ehci_writel(ehci, 0, &ehci->regs->segment);
378 ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
379 ehci_writel(ehci, (u32) ehci->async->qh_dma, &ehci->regs->async_next);
380
381 /* restore CMD_RUN, framelist size, and irq threshold */
382 ehci_writel(ehci, ehci->command, &ehci->regs->command);
383 ehci->rh_state = EHCI_RH_RUNNING;
384
385 /* Some controller/firmware combinations need a delay during which
386 * they set up the port statuses. See Bugzilla #8190. */
387 spin_unlock_irq(&ehci->lock);
388 msleep(8);
389 spin_lock_irq(&ehci->lock);
390
391 /* clear phy low-power mode before resume */
392 if (ehci->bus_suspended && ehci->has_hostpc) {
393 i = HCS_N_PORTS(ehci->hcs_params);
394 while (i--) {
395 if (test_bit(i, &ehci->bus_suspended)) {
396 u32 __iomem *hostpc_reg;
397
398 hostpc_reg = (u32 __iomem *)((u8 *) ehci->regs
399 + HOSTPC0 + 4 * i);
400 temp = ehci_readl(ehci, hostpc_reg);
401 ehci_writel(ehci, temp & ~HOSTPC_PHCD,
402 hostpc_reg);
403 }
404 }
405 spin_unlock_irq(&ehci->lock);
406 msleep(5);
407 spin_lock_irq(&ehci->lock);
408 }
409
410 /* manually resume the ports we suspended during bus_suspend() */
411 i = HCS_N_PORTS (ehci->hcs_params);
412 while (i--) {
413 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
414 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
415 if (test_bit(i, &ehci->bus_suspended) &&
416 (temp & PORT_SUSPEND)) {
417 temp |= PORT_RESUME;
418 set_bit(i, &resume_needed);
419 }
420 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
421 }
422
423 /* msleep for 20ms only if code is trying to resume port */
424 if (resume_needed) {
425 spin_unlock_irq(&ehci->lock);
426 msleep(20);
427 spin_lock_irq(&ehci->lock);
428 }
429
430 i = HCS_N_PORTS (ehci->hcs_params);
431 while (i--) {
432 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
433 if (test_bit(i, &resume_needed)) {
434 temp &= ~(PORT_RWC_BITS | PORT_RESUME);
435 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
436 ehci_vdbg (ehci, "resumed port %d\n", i + 1);
437 }
438 }
439 (void) ehci_readl(ehci, &ehci->regs->command);
440
441 /* maybe re-activate the schedule(s) */
442 temp = 0;
443 if (ehci->async->qh_next.qh)
444 temp |= CMD_ASE;
445 if (ehci->periodic_sched)
446 temp |= CMD_PSE;
447 if (temp) {
448 ehci->command |= temp;
449 ehci_writel(ehci, ehci->command, &ehci->regs->command);
450 }
451
452 ehci->next_statechange = jiffies + msecs_to_jiffies(5);
453
454 /* Now we can safely re-enable irqs */
455 ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
456
457 spin_unlock_irq (&ehci->lock);
458 ehci_handover_companion_ports(ehci);
459 return 0;
460 }
461
462 #else
463
464 #define ehci_bus_suspend NULL
465 #define ehci_bus_resume NULL
466
467 #endif /* CONFIG_PM */
468
469 /*-------------------------------------------------------------------------*/
470
471 /*
472 * Sets the owner of a port
473 */
474 static void set_owner(struct ehci_hcd *ehci, int portnum, int new_owner)
475 {
476 u32 __iomem *status_reg;
477 u32 port_status;
478 int try;
479
480 status_reg = &ehci->regs->port_status[portnum];
481
482 /*
483 * The controller won't set the OWNER bit if the port is
484 * enabled, so this loop will sometimes require at least two
485 * iterations: one to disable the port and one to set OWNER.
486 */
487 for (try = 4; try > 0; --try) {
488 spin_lock_irq(&ehci->lock);
489 port_status = ehci_readl(ehci, status_reg);
490 if ((port_status & PORT_OWNER) == new_owner
491 || (port_status & (PORT_OWNER | PORT_CONNECT))
492 == 0)
493 try = 0;
494 else {
495 port_status ^= PORT_OWNER;
496 port_status &= ~(PORT_PE | PORT_RWC_BITS);
497 ehci_writel(ehci, port_status, status_reg);
498 }
499 spin_unlock_irq(&ehci->lock);
500 if (try > 1)
501 msleep(5);
502 }
503 }
504
505 /*-------------------------------------------------------------------------*/
506
507 static int check_reset_complete (
508 struct ehci_hcd *ehci,
509 int index,
510 u32 __iomem *status_reg,
511 int port_status
512 ) {
513 if (!(port_status & PORT_CONNECT))
514 return port_status;
515
516 /* if reset finished and it's still not enabled -- handoff */
517 if (!(port_status & PORT_PE)) {
518
519 /* with integrated TT, there's nobody to hand it to! */
520 if (ehci_is_TDI(ehci)) {
521 ehci_dbg (ehci,
522 "Failed to enable port %d on root hub TT\n",
523 index+1);
524 return port_status;
525 }
526
527 ehci_dbg (ehci, "port %d full speed --> companion\n",
528 index + 1);
529
530 // what happens if HCS_N_CC(params) == 0 ?
531 port_status |= PORT_OWNER;
532 port_status &= ~PORT_RWC_BITS;
533 ehci_writel(ehci, port_status, status_reg);
534
535 /* ensure 440EPX ohci controller state is operational */
536 if (ehci->has_amcc_usb23)
537 set_ohci_hcfs(ehci, 1);
538 } else {
539 ehci_dbg (ehci, "port %d high speed\n", index + 1);
540 /* ensure 440EPx ohci controller state is suspended */
541 if (ehci->has_amcc_usb23)
542 set_ohci_hcfs(ehci, 0);
543 }
544
545 return port_status;
546 }
547
548 /*-------------------------------------------------------------------------*/
549
550
551 /* build "status change" packet (one or two bytes) from HC registers */
552
553 static int
554 ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
555 {
556 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
557 u32 temp, status = 0;
558 u32 mask;
559 int ports, i, retval = 1;
560 unsigned long flags;
561 u32 ppcd = 0;
562
563 /* if !USB_SUSPEND, root hub timers won't get shut down ... */
564 if (ehci->rh_state != EHCI_RH_RUNNING)
565 return 0;
566
567 /* init status to no-changes */
568 buf [0] = 0;
569 ports = HCS_N_PORTS (ehci->hcs_params);
570 if (ports > 7) {
571 buf [1] = 0;
572 retval++;
573 }
574
575 /* Some boards (mostly VIA?) report bogus overcurrent indications,
576 * causing massive log spam unless we completely ignore them. It
577 * may be relevant that VIA VT8235 controllers, where PORT_POWER is
578 * always set, seem to clear PORT_OCC and PORT_CSC when writing to
579 * PORT_POWER; that's surprising, but maybe within-spec.
580 */
581 if (!ignore_oc)
582 mask = PORT_CSC | PORT_PEC | PORT_OCC;
583 else
584 mask = PORT_CSC | PORT_PEC;
585 // PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
586
587 /* no hub change reports (bit 0) for now (power, ...) */
588
589 /* port N changes (bit N)? */
590 spin_lock_irqsave (&ehci->lock, flags);
591
592 /* get per-port change detect bits */
593 if (ehci->has_ppcd)
594 ppcd = ehci_readl(ehci, &ehci->regs->status) >> 16;
595
596 for (i = 0; i < ports; i++) {
597 /* leverage per-port change bits feature */
598 if (ehci->has_ppcd && !(ppcd & (1 << i)))
599 continue;
600 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
601
602 /*
603 * Return status information even for ports with OWNER set.
604 * Otherwise khubd wouldn't see the disconnect event when a
605 * high-speed device is switched over to the companion
606 * controller by the user.
607 */
608
609 if ((temp & mask) != 0 || test_bit(i, &ehci->port_c_suspend)
610 || (ehci->reset_done[i] && time_after_eq(
611 jiffies, ehci->reset_done[i]))) {
612 if (i < 7)
613 buf [0] |= 1 << (i + 1);
614 else
615 buf [1] |= 1 << (i - 7);
616 status = STS_PCD;
617 }
618 }
619 /* FIXME autosuspend idle root hubs */
620 spin_unlock_irqrestore (&ehci->lock, flags);
621 return status ? retval : 0;
622 }
623
624 /*-------------------------------------------------------------------------*/
625
626 static void
627 ehci_hub_descriptor (
628 struct ehci_hcd *ehci,
629 struct usb_hub_descriptor *desc
630 ) {
631 int ports = HCS_N_PORTS (ehci->hcs_params);
632 u16 temp;
633
634 desc->bDescriptorType = 0x29;
635 desc->bPwrOn2PwrGood = 10; /* ehci 1.0, 2.3.9 says 20ms max */
636 desc->bHubContrCurrent = 0;
637
638 desc->bNbrPorts = ports;
639 temp = 1 + (ports / 8);
640 desc->bDescLength = 7 + 2 * temp;
641
642 /* two bitmaps: ports removable, and usb 1.0 legacy PortPwrCtrlMask */
643 memset(&desc->u.hs.DeviceRemovable[0], 0, temp);
644 memset(&desc->u.hs.DeviceRemovable[temp], 0xff, temp);
645
646 temp = 0x0008; /* per-port overcurrent reporting */
647 if (HCS_PPC (ehci->hcs_params))
648 temp |= 0x0001; /* per-port power control */
649 else
650 temp |= 0x0002; /* no power switching */
651 #if 0
652 // re-enable when we support USB_PORT_FEAT_INDICATOR below.
653 if (HCS_INDICATOR (ehci->hcs_params))
654 temp |= 0x0080; /* per-port indicators (LEDs) */
655 #endif
656 desc->wHubCharacteristics = cpu_to_le16(temp);
657 }
658
659 /*-------------------------------------------------------------------------*/
660
661 static int ehci_hub_control (
662 struct usb_hcd *hcd,
663 u16 typeReq,
664 u16 wValue,
665 u16 wIndex,
666 char *buf,
667 u16 wLength
668 ) {
669 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
670 int ports = HCS_N_PORTS (ehci->hcs_params);
671 u32 __iomem *status_reg = &ehci->regs->port_status[
672 (wIndex & 0xff) - 1];
673 u32 __iomem *hostpc_reg = NULL;
674 u32 temp, temp1, status;
675 unsigned long flags;
676 int retval = 0;
677 unsigned selector;
678
679 /*
680 * FIXME: support SetPortFeatures USB_PORT_FEAT_INDICATOR.
681 * HCS_INDICATOR may say we can change LEDs to off/amber/green.
682 * (track current state ourselves) ... blink for diagnostics,
683 * power, "this is the one", etc. EHCI spec supports this.
684 */
685
686 if (ehci->has_hostpc)
687 hostpc_reg = (u32 __iomem *)((u8 *)ehci->regs
688 + HOSTPC0 + 4 * ((wIndex & 0xff) - 1));
689 spin_lock_irqsave (&ehci->lock, flags);
690 switch (typeReq) {
691 case ClearHubFeature:
692 switch (wValue) {
693 case C_HUB_LOCAL_POWER:
694 case C_HUB_OVER_CURRENT:
695 /* no hub-wide feature/status flags */
696 break;
697 default:
698 goto error;
699 }
700 break;
701 case ClearPortFeature:
702 if (!wIndex || wIndex > ports)
703 goto error;
704 wIndex--;
705 temp = ehci_readl(ehci, status_reg);
706
707 /*
708 * Even if OWNER is set, so the port is owned by the
709 * companion controller, khubd needs to be able to clear
710 * the port-change status bits (especially
711 * USB_PORT_STAT_C_CONNECTION).
712 */
713
714 switch (wValue) {
715 case USB_PORT_FEAT_ENABLE:
716 ehci_writel(ehci, temp & ~PORT_PE, status_reg);
717 break;
718 case USB_PORT_FEAT_C_ENABLE:
719 ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_PEC,
720 status_reg);
721 break;
722 case USB_PORT_FEAT_SUSPEND:
723 if (temp & PORT_RESET)
724 goto error;
725 if (ehci->no_selective_suspend)
726 break;
727 #ifdef CONFIG_USB_OTG
728 if ((hcd->self.otg_port == (wIndex + 1))
729 && hcd->self.b_hnp_enable) {
730 otg_start_hnp(ehci->transceiver);
731 break;
732 }
733 #endif
734 if (!(temp & PORT_SUSPEND))
735 break;
736 if ((temp & PORT_PE) == 0)
737 goto error;
738
739 /* clear phy low-power mode before resume */
740 if (hostpc_reg) {
741 temp1 = ehci_readl(ehci, hostpc_reg);
742 ehci_writel(ehci, temp1 & ~HOSTPC_PHCD,
743 hostpc_reg);
744 spin_unlock_irqrestore(&ehci->lock, flags);
745 msleep(5);/* wait to leave low-power mode */
746 spin_lock_irqsave(&ehci->lock, flags);
747 }
748 /* resume signaling for 20 msec */
749 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
750 ehci_writel(ehci, temp | PORT_RESUME, status_reg);
751 ehci->reset_done[wIndex] = jiffies
752 + msecs_to_jiffies(20);
753 break;
754 case USB_PORT_FEAT_C_SUSPEND:
755 clear_bit(wIndex, &ehci->port_c_suspend);
756 break;
757 case USB_PORT_FEAT_POWER:
758 if (HCS_PPC (ehci->hcs_params))
759 ehci_writel(ehci,
760 temp & ~(PORT_RWC_BITS | PORT_POWER),
761 status_reg);
762 break;
763 case USB_PORT_FEAT_C_CONNECTION:
764 if (ehci->has_lpm) {
765 /* clear PORTSC bits on disconnect */
766 temp &= ~PORT_LPM;
767 temp &= ~PORT_DEV_ADDR;
768 }
769 ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_CSC,
770 status_reg);
771 break;
772 case USB_PORT_FEAT_C_OVER_CURRENT:
773 ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_OCC,
774 status_reg);
775 break;
776 case USB_PORT_FEAT_C_RESET:
777 /* GetPortStatus clears reset */
778 break;
779 default:
780 goto error;
781 }
782 ehci_readl(ehci, &ehci->regs->command); /* unblock posted write */
783 break;
784 case GetHubDescriptor:
785 ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
786 buf);
787 break;
788 case GetHubStatus:
789 /* no hub-wide feature/status flags */
790 memset (buf, 0, 4);
791 //cpu_to_le32s ((u32 *) buf);
792 break;
793 case GetPortStatus:
794 if (!wIndex || wIndex > ports)
795 goto error;
796 wIndex--;
797 status = 0;
798 temp = ehci_readl(ehci, status_reg);
799
800 // wPortChange bits
801 if (temp & PORT_CSC)
802 status |= USB_PORT_STAT_C_CONNECTION << 16;
803 if (temp & PORT_PEC)
804 status |= USB_PORT_STAT_C_ENABLE << 16;
805
806 if ((temp & PORT_OCC) && !ignore_oc){
807 status |= USB_PORT_STAT_C_OVERCURRENT << 16;
808
809 /*
810 * Hubs should disable port power on over-current.
811 * However, not all EHCI implementations do this
812 * automatically, even if they _do_ support per-port
813 * power switching; they're allowed to just limit the
814 * current. khubd will turn the power back on.
815 */
816 if ((temp & PORT_OC) && HCS_PPC(ehci->hcs_params)) {
817 ehci_writel(ehci,
818 temp & ~(PORT_RWC_BITS | PORT_POWER),
819 status_reg);
820 temp = ehci_readl(ehci, status_reg);
821 }
822 }
823
824 /* whoever resumes must GetPortStatus to complete it!! */
825 if (temp & PORT_RESUME) {
826
827 /* Remote Wakeup received? */
828 if (!ehci->reset_done[wIndex]) {
829 /* resume signaling for 20 msec */
830 ehci->reset_done[wIndex] = jiffies
831 + msecs_to_jiffies(20);
832 /* check the port again */
833 mod_timer(&ehci_to_hcd(ehci)->rh_timer,
834 ehci->reset_done[wIndex]);
835 }
836
837 /* resume completed? */
838 else if (time_after_eq(jiffies,
839 ehci->reset_done[wIndex])) {
840 clear_bit(wIndex, &ehci->suspended_ports);
841 set_bit(wIndex, &ehci->port_c_suspend);
842 ehci->reset_done[wIndex] = 0;
843
844 /* stop resume signaling */
845 temp = ehci_readl(ehci, status_reg);
846 ehci_writel(ehci,
847 temp & ~(PORT_RWC_BITS | PORT_RESUME),
848 status_reg);
849 retval = handshake(ehci, status_reg,
850 PORT_RESUME, 0, 2000 /* 2msec */);
851 if (retval != 0) {
852 ehci_err(ehci,
853 "port %d resume error %d\n",
854 wIndex + 1, retval);
855 goto error;
856 }
857 temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10));
858 }
859 }
860
861 /* whoever resets must GetPortStatus to complete it!! */
862 if ((temp & PORT_RESET)
863 && time_after_eq(jiffies,
864 ehci->reset_done[wIndex])) {
865 status |= USB_PORT_STAT_C_RESET << 16;
866 ehci->reset_done [wIndex] = 0;
867
868 /* force reset to complete */
869 ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESET),
870 status_reg);
871 /* REVISIT: some hardware needs 550+ usec to clear
872 * this bit; seems too long to spin routinely...
873 */
874 retval = handshake(ehci, status_reg,
875 PORT_RESET, 0, 1000);
876 if (retval != 0) {
877 ehci_err (ehci, "port %d reset error %d\n",
878 wIndex + 1, retval);
879 goto error;
880 }
881
882 /* see what we found out */
883 temp = check_reset_complete (ehci, wIndex, status_reg,
884 ehci_readl(ehci, status_reg));
885 }
886
887 if (!(temp & (PORT_RESUME|PORT_RESET)))
888 ehci->reset_done[wIndex] = 0;
889
890 /* transfer dedicated ports to the companion hc */
891 if ((temp & PORT_CONNECT) &&
892 test_bit(wIndex, &ehci->companion_ports)) {
893 temp &= ~PORT_RWC_BITS;
894 temp |= PORT_OWNER;
895 ehci_writel(ehci, temp, status_reg);
896 ehci_dbg(ehci, "port %d --> companion\n", wIndex + 1);
897 temp = ehci_readl(ehci, status_reg);
898 }
899
900 /*
901 * Even if OWNER is set, there's no harm letting khubd
902 * see the wPortStatus values (they should all be 0 except
903 * for PORT_POWER anyway).
904 */
905
906 if (temp & PORT_CONNECT) {
907 status |= USB_PORT_STAT_CONNECTION;
908 // status may be from integrated TT
909 if (ehci->has_hostpc) {
910 temp1 = ehci_readl(ehci, hostpc_reg);
911 status |= ehci_port_speed(ehci, temp1);
912 } else
913 status |= ehci_port_speed(ehci, temp);
914 }
915 if (temp & PORT_PE)
916 status |= USB_PORT_STAT_ENABLE;
917
918 /* maybe the port was unsuspended without our knowledge */
919 if (temp & (PORT_SUSPEND|PORT_RESUME)) {
920 status |= USB_PORT_STAT_SUSPEND;
921 } else if (test_bit(wIndex, &ehci->suspended_ports)) {
922 clear_bit(wIndex, &ehci->suspended_ports);
923 ehci->reset_done[wIndex] = 0;
924 if (temp & PORT_PE)
925 set_bit(wIndex, &ehci->port_c_suspend);
926 }
927
928 if (temp & PORT_OC)
929 status |= USB_PORT_STAT_OVERCURRENT;
930 if (temp & PORT_RESET)
931 status |= USB_PORT_STAT_RESET;
932 if (temp & PORT_POWER)
933 status |= USB_PORT_STAT_POWER;
934 if (test_bit(wIndex, &ehci->port_c_suspend))
935 status |= USB_PORT_STAT_C_SUSPEND << 16;
936
937 #ifndef VERBOSE_DEBUG
938 if (status & ~0xffff) /* only if wPortChange is interesting */
939 #endif
940 dbg_port (ehci, "GetStatus", wIndex + 1, temp);
941 put_unaligned_le32(status, buf);
942 break;
943 case SetHubFeature:
944 switch (wValue) {
945 case C_HUB_LOCAL_POWER:
946 case C_HUB_OVER_CURRENT:
947 /* no hub-wide feature/status flags */
948 break;
949 default:
950 goto error;
951 }
952 break;
953 case SetPortFeature:
954 selector = wIndex >> 8;
955 wIndex &= 0xff;
956 if (unlikely(ehci->debug)) {
957 /* If the debug port is active any port
958 * feature requests should get denied */
959 if (wIndex == HCS_DEBUG_PORT(ehci->hcs_params) &&
960 (readl(&ehci->debug->control) & DBGP_ENABLED)) {
961 retval = -ENODEV;
962 goto error_exit;
963 }
964 }
965 if (!wIndex || wIndex > ports)
966 goto error;
967 wIndex--;
968 temp = ehci_readl(ehci, status_reg);
969 if (temp & PORT_OWNER)
970 break;
971
972 temp &= ~PORT_RWC_BITS;
973 switch (wValue) {
974 case USB_PORT_FEAT_SUSPEND:
975 if (ehci->no_selective_suspend)
976 break;
977 if ((temp & PORT_PE) == 0
978 || (temp & PORT_RESET) != 0)
979 goto error;
980
981 /* After above check the port must be connected.
982 * Set appropriate bit thus could put phy into low power
983 * mode if we have hostpc feature
984 */
985 temp &= ~PORT_WKCONN_E;
986 temp |= PORT_WKDISC_E | PORT_WKOC_E;
987 ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
988 if (hostpc_reg) {
989 spin_unlock_irqrestore(&ehci->lock, flags);
990 msleep(5);/* 5ms for HCD enter low pwr mode */
991 spin_lock_irqsave(&ehci->lock, flags);
992 temp1 = ehci_readl(ehci, hostpc_reg);
993 ehci_writel(ehci, temp1 | HOSTPC_PHCD,
994 hostpc_reg);
995 temp1 = ehci_readl(ehci, hostpc_reg);
996 ehci_dbg(ehci, "Port%d phy low pwr mode %s\n",
997 wIndex, (temp1 & HOSTPC_PHCD) ?
998 "succeeded" : "failed");
999 }
1000 set_bit(wIndex, &ehci->suspended_ports);
1001 break;
1002 case USB_PORT_FEAT_POWER:
1003 if (HCS_PPC (ehci->hcs_params))
1004 ehci_writel(ehci, temp | PORT_POWER,
1005 status_reg);
1006 break;
1007 case USB_PORT_FEAT_RESET:
1008 if (temp & PORT_RESUME)
1009 goto error;
1010 /* line status bits may report this as low speed,
1011 * which can be fine if this root hub has a
1012 * transaction translator built in.
1013 */
1014 if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
1015 && !ehci_is_TDI(ehci)
1016 && PORT_USB11 (temp)) {
1017 ehci_dbg (ehci,
1018 "port %d low speed --> companion\n",
1019 wIndex + 1);
1020 temp |= PORT_OWNER;
1021 } else {
1022 ehci_vdbg (ehci, "port %d reset\n", wIndex + 1);
1023 temp |= PORT_RESET;
1024 temp &= ~PORT_PE;
1025
1026 /*
1027 * caller must wait, then call GetPortStatus
1028 * usb 2.0 spec says 50 ms resets on root
1029 */
1030 ehci->reset_done [wIndex] = jiffies
1031 + msecs_to_jiffies (50);
1032 }
1033 ehci_writel(ehci, temp, status_reg);
1034 break;
1035
1036 /* For downstream facing ports (these): one hub port is put
1037 * into test mode according to USB2 11.24.2.13, then the hub
1038 * must be reset (which for root hub now means rmmod+modprobe,
1039 * or else system reboot). See EHCI 2.3.9 and 4.14 for info
1040 * about the EHCI-specific stuff.
1041 */
1042 case USB_PORT_FEAT_TEST:
1043 if (!selector || selector > 5)
1044 goto error;
1045 ehci_quiesce(ehci);
1046
1047 /* Put all enabled ports into suspend */
1048 while (ports--) {
1049 u32 __iomem *sreg =
1050 &ehci->regs->port_status[ports];
1051
1052 temp = ehci_readl(ehci, sreg) & ~PORT_RWC_BITS;
1053 if (temp & PORT_PE)
1054 ehci_writel(ehci, temp | PORT_SUSPEND,
1055 sreg);
1056 }
1057 ehci_halt(ehci);
1058 temp = ehci_readl(ehci, status_reg);
1059 temp |= selector << 16;
1060 ehci_writel(ehci, temp, status_reg);
1061 break;
1062
1063 default:
1064 goto error;
1065 }
1066 ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
1067 break;
1068
1069 default:
1070 error:
1071 /* "stall" on error */
1072 retval = -EPIPE;
1073 }
1074 error_exit:
1075 spin_unlock_irqrestore (&ehci->lock, flags);
1076 return retval;
1077 }
1078
1079 static void ehci_relinquish_port(struct usb_hcd *hcd, int portnum)
1080 {
1081 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
1082
1083 if (ehci_is_TDI(ehci))
1084 return;
1085 set_owner(ehci, --portnum, PORT_OWNER);
1086 }
1087
1088 static int ehci_port_handed_over(struct usb_hcd *hcd, int portnum)
1089 {
1090 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
1091 u32 __iomem *reg;
1092
1093 if (ehci_is_TDI(ehci))
1094 return 0;
1095 reg = &ehci->regs->port_status[portnum - 1];
1096 return ehci_readl(ehci, reg) & PORT_OWNER;
1097 }
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