0dcb4164dc8368a9187b670c2a303c39cfdfa109
[linux-2.6.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 #ifdef  CONFIG_USB_PERSIST
32
33 static int ehci_hub_control(
34         struct usb_hcd  *hcd,
35         u16             typeReq,
36         u16             wValue,
37         u16             wIndex,
38         char            *buf,
39         u16             wLength
40 );
41
42 /* After a power loss, ports that were owned by the companion must be
43  * reset so that the companion can still own them.
44  */
45 static void ehci_handover_companion_ports(struct ehci_hcd *ehci)
46 {
47         u32 __iomem     *reg;
48         u32             status;
49         int             port;
50         __le32          buf;
51         struct usb_hcd  *hcd = ehci_to_hcd(ehci);
52
53         if (!ehci->owned_ports)
54                 return;
55
56         /* Give the connections some time to appear */
57         msleep(20);
58
59         port = HCS_N_PORTS(ehci->hcs_params);
60         while (port--) {
61                 if (test_bit(port, &ehci->owned_ports)) {
62                         reg = &ehci->regs->port_status[port];
63                         status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
64
65                         /* Port already owned by companion? */
66                         if (status & PORT_OWNER)
67                                 clear_bit(port, &ehci->owned_ports);
68                         else if (test_bit(port, &ehci->companion_ports))
69                                 ehci_writel(ehci, status & ~PORT_PE, reg);
70                         else
71                                 ehci_hub_control(hcd, SetPortFeature,
72                                                 USB_PORT_FEAT_RESET, port + 1,
73                                                 NULL, 0);
74                 }
75         }
76
77         if (!ehci->owned_ports)
78                 return;
79         msleep(90);             /* Wait for resets to complete */
80
81         port = HCS_N_PORTS(ehci->hcs_params);
82         while (port--) {
83                 if (test_bit(port, &ehci->owned_ports)) {
84                         ehci_hub_control(hcd, GetPortStatus,
85                                         0, port + 1,
86                                         (char *) &buf, sizeof(buf));
87
88                         /* The companion should now own the port,
89                          * but if something went wrong the port must not
90                          * remain enabled.
91                          */
92                         reg = &ehci->regs->port_status[port];
93                         status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
94                         if (status & PORT_OWNER)
95                                 ehci_writel(ehci, status | PORT_CSC, reg);
96                         else {
97                                 ehci_dbg(ehci, "failed handover port %d: %x\n",
98                                                 port + 1, status);
99                                 ehci_writel(ehci, status & ~PORT_PE, reg);
100                         }
101                 }
102         }
103
104         ehci->owned_ports = 0;
105 }
106
107 #else   /* CONFIG_USB_PERSIST */
108
109 static inline void ehci_handover_companion_ports(struct ehci_hcd *ehci)
110 { }
111
112 #endif
113
114 #ifdef  CONFIG_PM
115
116 static int ehci_bus_suspend (struct usb_hcd *hcd)
117 {
118         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
119         int                     port;
120         int                     mask;
121
122         ehci_dbg(ehci, "suspend root hub\n");
123
124         if (time_before (jiffies, ehci->next_statechange))
125                 msleep(5);
126
127         port = HCS_N_PORTS (ehci->hcs_params);
128         spin_lock_irq (&ehci->lock);
129
130         /* stop schedules, clean any completed work */
131         if (HC_IS_RUNNING(hcd->state)) {
132                 ehci_quiesce (ehci);
133                 hcd->state = HC_STATE_QUIESCING;
134         }
135         ehci->command = ehci_readl(ehci, &ehci->regs->command);
136         if (ehci->reclaim)
137                 ehci->reclaim_ready = 1;
138         ehci_work(ehci);
139
140         /* Unlike other USB host controller types, EHCI doesn't have
141          * any notion of "global" or bus-wide suspend.  The driver has
142          * to manually suspend all the active unsuspended ports, and
143          * then manually resume them in the bus_resume() routine.
144          */
145         ehci->bus_suspended = 0;
146         ehci->owned_ports = 0;
147         while (port--) {
148                 u32 __iomem     *reg = &ehci->regs->port_status [port];
149                 u32             t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
150                 u32             t2 = t1;
151
152                 /* keep track of which ports we suspend */
153                 if (t1 & PORT_OWNER)
154                         set_bit(port, &ehci->owned_ports);
155                 else if ((t1 & PORT_PE) && !(t1 & PORT_SUSPEND)) {
156                         t2 |= PORT_SUSPEND;
157                         set_bit(port, &ehci->bus_suspended);
158                 }
159
160                 /* enable remote wakeup on all ports */
161                 if (device_may_wakeup(&hcd->self.root_hub->dev))
162                         t2 |= PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E;
163                 else
164                         t2 &= ~(PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E);
165
166                 if (t1 != t2) {
167                         ehci_vdbg (ehci, "port %d, %08x -> %08x\n",
168                                 port + 1, t1, t2);
169                         ehci_writel(ehci, t2, reg);
170                 }
171         }
172
173         /* turn off now-idle HC */
174         del_timer_sync (&ehci->watchdog);
175         ehci_halt (ehci);
176         hcd->state = HC_STATE_SUSPENDED;
177
178         /* allow remote wakeup */
179         mask = INTR_MASK;
180         if (!device_may_wakeup(&hcd->self.root_hub->dev))
181                 mask &= ~STS_PCD;
182         ehci_writel(ehci, mask, &ehci->regs->intr_enable);
183         ehci_readl(ehci, &ehci->regs->intr_enable);
184
185         ehci->next_statechange = jiffies + msecs_to_jiffies(10);
186         spin_unlock_irq (&ehci->lock);
187         return 0;
188 }
189
190
191 /* caller has locked the root hub, and should reset/reinit on error */
192 static int ehci_bus_resume (struct usb_hcd *hcd)
193 {
194         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
195         u32                     temp;
196         u32                     power_okay;
197         int                     i;
198
199         if (time_before (jiffies, ehci->next_statechange))
200                 msleep(5);
201         spin_lock_irq (&ehci->lock);
202         if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
203                 spin_unlock_irq(&ehci->lock);
204                 return -ESHUTDOWN;
205         }
206
207         /* Ideally and we've got a real resume here, and no port's power
208          * was lost.  (For PCI, that means Vaux was maintained.)  But we
209          * could instead be restoring a swsusp snapshot -- so that BIOS was
210          * the last user of the controller, not reset/pm hardware keeping
211          * state we gave to it.
212          */
213         power_okay = ehci_readl(ehci, &ehci->regs->intr_enable);
214         ehci_dbg(ehci, "resume root hub%s\n",
215                         power_okay ? "" : " after power loss");
216
217         /* at least some APM implementations will try to deliver
218          * IRQs right away, so delay them until we're ready.
219          */
220         ehci_writel(ehci, 0, &ehci->regs->intr_enable);
221
222         /* re-init operational registers */
223         ehci_writel(ehci, 0, &ehci->regs->segment);
224         ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
225         ehci_writel(ehci, (u32) ehci->async->qh_dma, &ehci->regs->async_next);
226
227         /* restore CMD_RUN, framelist size, and irq threshold */
228         ehci_writel(ehci, ehci->command, &ehci->regs->command);
229
230         /* Some controller/firmware combinations need a delay during which
231          * they set up the port statuses.  See Bugzilla #8190. */
232         mdelay(8);
233
234         /* manually resume the ports we suspended during bus_suspend() */
235         i = HCS_N_PORTS (ehci->hcs_params);
236         while (i--) {
237                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
238                 temp &= ~(PORT_RWC_BITS
239                         | PORT_WKOC_E | PORT_WKDISC_E | PORT_WKCONN_E);
240                 if (test_bit(i, &ehci->bus_suspended) &&
241                                 (temp & PORT_SUSPEND)) {
242                         ehci->reset_done [i] = jiffies + msecs_to_jiffies (20);
243                         temp |= PORT_RESUME;
244                 }
245                 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
246         }
247         i = HCS_N_PORTS (ehci->hcs_params);
248         mdelay (20);
249         while (i--) {
250                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
251                 if (test_bit(i, &ehci->bus_suspended) &&
252                                 (temp & PORT_SUSPEND)) {
253                         temp &= ~(PORT_RWC_BITS | PORT_RESUME);
254                         ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
255                         ehci_vdbg (ehci, "resumed port %d\n", i + 1);
256                 }
257         }
258         (void) ehci_readl(ehci, &ehci->regs->command);
259
260         /* maybe re-activate the schedule(s) */
261         temp = 0;
262         if (ehci->async->qh_next.qh)
263                 temp |= CMD_ASE;
264         if (ehci->periodic_sched)
265                 temp |= CMD_PSE;
266         if (temp) {
267                 ehci->command |= temp;
268                 ehci_writel(ehci, ehci->command, &ehci->regs->command);
269         }
270
271         ehci->next_statechange = jiffies + msecs_to_jiffies(5);
272         hcd->state = HC_STATE_RUNNING;
273
274         /* Now we can safely re-enable irqs */
275         ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
276
277         spin_unlock_irq (&ehci->lock);
278
279         if (!power_okay)
280                 ehci_handover_companion_ports(ehci);
281         return 0;
282 }
283
284 #else
285
286 #define ehci_bus_suspend        NULL
287 #define ehci_bus_resume         NULL
288
289 #endif  /* CONFIG_PM */
290
291 /*-------------------------------------------------------------------------*/
292
293 /* Display the ports dedicated to the companion controller */
294 static ssize_t show_companion(struct class_device *class_dev, char *buf)
295 {
296         struct ehci_hcd         *ehci;
297         int                     nports, index, n;
298         int                     count = PAGE_SIZE;
299         char                    *ptr = buf;
300
301         ehci = hcd_to_ehci(bus_to_hcd(class_get_devdata(class_dev)));
302         nports = HCS_N_PORTS(ehci->hcs_params);
303
304         for (index = 0; index < nports; ++index) {
305                 if (test_bit(index, &ehci->companion_ports)) {
306                         n = scnprintf(ptr, count, "%d\n", index + 1);
307                         ptr += n;
308                         count -= n;
309                 }
310         }
311         return ptr - buf;
312 }
313
314 /*
315  * Dedicate or undedicate a port to the companion controller.
316  * Syntax is "[-]portnum", where a leading '-' sign means
317  * return control of the port to the EHCI controller.
318  */
319 static ssize_t store_companion(struct class_device *class_dev,
320                 const char *buf, size_t count)
321 {
322         struct ehci_hcd         *ehci;
323         int                     portnum, new_owner, try;
324         u32 __iomem             *status_reg;
325         u32                     port_status;
326
327         ehci = hcd_to_ehci(bus_to_hcd(class_get_devdata(class_dev)));
328         new_owner = PORT_OWNER;         /* Owned by companion */
329         if (sscanf(buf, "%d", &portnum) != 1)
330                 return -EINVAL;
331         if (portnum < 0) {
332                 portnum = - portnum;
333                 new_owner = 0;          /* Owned by EHCI */
334         }
335         if (portnum <= 0 || portnum > HCS_N_PORTS(ehci->hcs_params))
336                 return -ENOENT;
337         status_reg = &ehci->regs->port_status[--portnum];
338         if (new_owner)
339                 set_bit(portnum, &ehci->companion_ports);
340         else
341                 clear_bit(portnum, &ehci->companion_ports);
342
343         /*
344          * The controller won't set the OWNER bit if the port is
345          * enabled, so this loop will sometimes require at least two
346          * iterations: one to disable the port and one to set OWNER.
347          */
348
349         for (try = 4; try > 0; --try) {
350                 spin_lock_irq(&ehci->lock);
351                 port_status = ehci_readl(ehci, status_reg);
352                 if ((port_status & PORT_OWNER) == new_owner
353                                 || (port_status & (PORT_OWNER | PORT_CONNECT))
354                                         == 0)
355                         try = 0;
356                 else {
357                         port_status ^= PORT_OWNER;
358                         port_status &= ~(PORT_PE | PORT_RWC_BITS);
359                         ehci_writel(ehci, port_status, status_reg);
360                 }
361                 spin_unlock_irq(&ehci->lock);
362                 if (try > 1)
363                         msleep(5);
364         }
365         return count;
366 }
367 static CLASS_DEVICE_ATTR(companion, 0644, show_companion, store_companion);
368
369 static inline void create_companion_file(struct ehci_hcd *ehci)
370 {
371         int     i;
372
373         /* with integrated TT there is no companion! */
374         if (!ehci_is_TDI(ehci))
375                 i = class_device_create_file(ehci_to_hcd(ehci)->self.class_dev,
376                                 &class_device_attr_companion);
377 }
378
379 static inline void remove_companion_file(struct ehci_hcd *ehci)
380 {
381         /* with integrated TT there is no companion! */
382         if (!ehci_is_TDI(ehci))
383                 class_device_remove_file(ehci_to_hcd(ehci)->self.class_dev,
384                                 &class_device_attr_companion);
385 }
386
387
388 /*-------------------------------------------------------------------------*/
389
390 static int check_reset_complete (
391         struct ehci_hcd *ehci,
392         int             index,
393         u32 __iomem     *status_reg,
394         int             port_status
395 ) {
396         if (!(port_status & PORT_CONNECT)) {
397                 ehci->reset_done [index] = 0;
398                 return port_status;
399         }
400
401         /* if reset finished and it's still not enabled -- handoff */
402         if (!(port_status & PORT_PE)) {
403
404                 /* with integrated TT, there's nobody to hand it to! */
405                 if (ehci_is_TDI(ehci)) {
406                         ehci_dbg (ehci,
407                                 "Failed to enable port %d on root hub TT\n",
408                                 index+1);
409                         return port_status;
410                 }
411
412                 ehci_dbg (ehci, "port %d full speed --> companion\n",
413                         index + 1);
414
415                 // what happens if HCS_N_CC(params) == 0 ?
416                 port_status |= PORT_OWNER;
417                 port_status &= ~PORT_RWC_BITS;
418                 ehci_writel(ehci, port_status, status_reg);
419
420         } else
421                 ehci_dbg (ehci, "port %d high speed\n", index + 1);
422
423         return port_status;
424 }
425
426 /*-------------------------------------------------------------------------*/
427
428
429 /* build "status change" packet (one or two bytes) from HC registers */
430
431 static int
432 ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
433 {
434         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
435         u32             temp, status = 0;
436         u32             mask;
437         int             ports, i, retval = 1;
438         unsigned long   flags;
439
440         /* if !USB_SUSPEND, root hub timers won't get shut down ... */
441         if (!HC_IS_RUNNING(hcd->state))
442                 return 0;
443
444         /* init status to no-changes */
445         buf [0] = 0;
446         ports = HCS_N_PORTS (ehci->hcs_params);
447         if (ports > 7) {
448                 buf [1] = 0;
449                 retval++;
450         }
451
452         /* Some boards (mostly VIA?) report bogus overcurrent indications,
453          * causing massive log spam unless we completely ignore them.  It
454          * may be relevant that VIA VT8235 controlers, where PORT_POWER is
455          * always set, seem to clear PORT_OCC and PORT_CSC when writing to
456          * PORT_POWER; that's surprising, but maybe within-spec.
457          */
458         if (!ignore_oc)
459                 mask = PORT_CSC | PORT_PEC | PORT_OCC;
460         else
461                 mask = PORT_CSC | PORT_PEC;
462         // PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
463
464         /* no hub change reports (bit 0) for now (power, ...) */
465
466         /* port N changes (bit N)? */
467         spin_lock_irqsave (&ehci->lock, flags);
468         for (i = 0; i < ports; i++) {
469                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
470
471                 /*
472                  * Return status information even for ports with OWNER set.
473                  * Otherwise khubd wouldn't see the disconnect event when a
474                  * high-speed device is switched over to the companion
475                  * controller by the user.
476                  */
477
478                 if (!(temp & PORT_CONNECT))
479                         ehci->reset_done [i] = 0;
480                 if ((temp & mask) != 0
481                                 || ((temp & PORT_RESUME) != 0
482                                         && time_after_eq(jiffies,
483                                                 ehci->reset_done[i]))) {
484                         if (i < 7)
485                             buf [0] |= 1 << (i + 1);
486                         else
487                             buf [1] |= 1 << (i - 7);
488                         status = STS_PCD;
489                 }
490         }
491         /* FIXME autosuspend idle root hubs */
492         spin_unlock_irqrestore (&ehci->lock, flags);
493         return status ? retval : 0;
494 }
495
496 /*-------------------------------------------------------------------------*/
497
498 static void
499 ehci_hub_descriptor (
500         struct ehci_hcd                 *ehci,
501         struct usb_hub_descriptor       *desc
502 ) {
503         int             ports = HCS_N_PORTS (ehci->hcs_params);
504         u16             temp;
505
506         desc->bDescriptorType = 0x29;
507         desc->bPwrOn2PwrGood = 10;      /* ehci 1.0, 2.3.9 says 20ms max */
508         desc->bHubContrCurrent = 0;
509
510         desc->bNbrPorts = ports;
511         temp = 1 + (ports / 8);
512         desc->bDescLength = 7 + 2 * temp;
513
514         /* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
515         memset (&desc->bitmap [0], 0, temp);
516         memset (&desc->bitmap [temp], 0xff, temp);
517
518         temp = 0x0008;                  /* per-port overcurrent reporting */
519         if (HCS_PPC (ehci->hcs_params))
520                 temp |= 0x0001;         /* per-port power control */
521         else
522                 temp |= 0x0002;         /* no power switching */
523 #if 0
524 // re-enable when we support USB_PORT_FEAT_INDICATOR below.
525         if (HCS_INDICATOR (ehci->hcs_params))
526                 temp |= 0x0080;         /* per-port indicators (LEDs) */
527 #endif
528         desc->wHubCharacteristics = (__force __u16)cpu_to_le16 (temp);
529 }
530
531 /*-------------------------------------------------------------------------*/
532
533 #define PORT_WAKE_BITS  (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
534
535 static int ehci_hub_control (
536         struct usb_hcd  *hcd,
537         u16             typeReq,
538         u16             wValue,
539         u16             wIndex,
540         char            *buf,
541         u16             wLength
542 ) {
543         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
544         int             ports = HCS_N_PORTS (ehci->hcs_params);
545         u32 __iomem     *status_reg = &ehci->regs->port_status[
546                                 (wIndex & 0xff) - 1];
547         u32             temp, status;
548         unsigned long   flags;
549         int             retval = 0;
550         unsigned        selector;
551
552         /*
553          * FIXME:  support SetPortFeatures USB_PORT_FEAT_INDICATOR.
554          * HCS_INDICATOR may say we can change LEDs to off/amber/green.
555          * (track current state ourselves) ... blink for diagnostics,
556          * power, "this is the one", etc.  EHCI spec supports this.
557          */
558
559         spin_lock_irqsave (&ehci->lock, flags);
560         switch (typeReq) {
561         case ClearHubFeature:
562                 switch (wValue) {
563                 case C_HUB_LOCAL_POWER:
564                 case C_HUB_OVER_CURRENT:
565                         /* no hub-wide feature/status flags */
566                         break;
567                 default:
568                         goto error;
569                 }
570                 break;
571         case ClearPortFeature:
572                 if (!wIndex || wIndex > ports)
573                         goto error;
574                 wIndex--;
575                 temp = ehci_readl(ehci, status_reg);
576
577                 /*
578                  * Even if OWNER is set, so the port is owned by the
579                  * companion controller, khubd needs to be able to clear
580                  * the port-change status bits (especially
581                  * USB_PORT_FEAT_C_CONNECTION).
582                  */
583
584                 switch (wValue) {
585                 case USB_PORT_FEAT_ENABLE:
586                         ehci_writel(ehci, temp & ~PORT_PE, status_reg);
587                         break;
588                 case USB_PORT_FEAT_C_ENABLE:
589                         ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_PEC,
590                                         status_reg);
591                         break;
592                 case USB_PORT_FEAT_SUSPEND:
593                         if (temp & PORT_RESET)
594                                 goto error;
595                         if (ehci->no_selective_suspend)
596                                 break;
597                         if (temp & PORT_SUSPEND) {
598                                 if ((temp & PORT_PE) == 0)
599                                         goto error;
600                                 /* resume signaling for 20 msec */
601                                 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
602                                 ehci_writel(ehci, temp | PORT_RESUME,
603                                                 status_reg);
604                                 ehci->reset_done [wIndex] = jiffies
605                                                 + msecs_to_jiffies (20);
606                         }
607                         break;
608                 case USB_PORT_FEAT_C_SUSPEND:
609                         /* we auto-clear this feature */
610                         break;
611                 case USB_PORT_FEAT_POWER:
612                         if (HCS_PPC (ehci->hcs_params))
613                                 ehci_writel(ehci,
614                                           temp & ~(PORT_RWC_BITS | PORT_POWER),
615                                           status_reg);
616                         break;
617                 case USB_PORT_FEAT_C_CONNECTION:
618                         ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_CSC,
619                                         status_reg);
620                         break;
621                 case USB_PORT_FEAT_C_OVER_CURRENT:
622                         ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_OCC,
623                                         status_reg);
624                         break;
625                 case USB_PORT_FEAT_C_RESET:
626                         /* GetPortStatus clears reset */
627                         break;
628                 default:
629                         goto error;
630                 }
631                 ehci_readl(ehci, &ehci->regs->command); /* unblock posted write */
632                 break;
633         case GetHubDescriptor:
634                 ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
635                         buf);
636                 break;
637         case GetHubStatus:
638                 /* no hub-wide feature/status flags */
639                 memset (buf, 0, 4);
640                 //cpu_to_le32s ((u32 *) buf);
641                 break;
642         case GetPortStatus:
643                 if (!wIndex || wIndex > ports)
644                         goto error;
645                 wIndex--;
646                 status = 0;
647                 temp = ehci_readl(ehci, status_reg);
648
649                 // wPortChange bits
650                 if (temp & PORT_CSC)
651                         status |= 1 << USB_PORT_FEAT_C_CONNECTION;
652                 if (temp & PORT_PEC)
653                         status |= 1 << USB_PORT_FEAT_C_ENABLE;
654
655                 if ((temp & PORT_OCC) && !ignore_oc){
656                         status |= 1 << USB_PORT_FEAT_C_OVER_CURRENT;
657
658                         /*
659                          * Hubs should disable port power on over-current.
660                          * However, not all EHCI implementations do this
661                          * automatically, even if they _do_ support per-port
662                          * power switching; they're allowed to just limit the
663                          * current.  khubd will turn the power back on.
664                          */
665                         if (HCS_PPC (ehci->hcs_params)){
666                                 ehci_writel(ehci,
667                                         temp & ~(PORT_RWC_BITS | PORT_POWER),
668                                         status_reg);
669                         }
670                 }
671
672                 /* whoever resumes must GetPortStatus to complete it!! */
673                 if (temp & PORT_RESUME) {
674
675                         /* Remote Wakeup received? */
676                         if (!ehci->reset_done[wIndex]) {
677                                 /* resume signaling for 20 msec */
678                                 ehci->reset_done[wIndex] = jiffies
679                                                 + msecs_to_jiffies(20);
680                                 /* check the port again */
681                                 mod_timer(&ehci_to_hcd(ehci)->rh_timer,
682                                                 ehci->reset_done[wIndex]);
683                         }
684
685                         /* resume completed? */
686                         else if (time_after_eq(jiffies,
687                                         ehci->reset_done[wIndex])) {
688                                 status |= 1 << USB_PORT_FEAT_C_SUSPEND;
689                                 ehci->reset_done[wIndex] = 0;
690
691                                 /* stop resume signaling */
692                                 temp = ehci_readl(ehci, status_reg);
693                                 ehci_writel(ehci,
694                                         temp & ~(PORT_RWC_BITS | PORT_RESUME),
695                                         status_reg);
696                                 retval = handshake(ehci, status_reg,
697                                            PORT_RESUME, 0, 2000 /* 2msec */);
698                                 if (retval != 0) {
699                                         ehci_err(ehci,
700                                                 "port %d resume error %d\n",
701                                                 wIndex + 1, retval);
702                                         goto error;
703                                 }
704                                 temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10));
705                         }
706                 }
707
708                 /* whoever resets must GetPortStatus to complete it!! */
709                 if ((temp & PORT_RESET)
710                                 && time_after_eq(jiffies,
711                                         ehci->reset_done[wIndex])) {
712                         status |= 1 << USB_PORT_FEAT_C_RESET;
713                         ehci->reset_done [wIndex] = 0;
714
715                         /* force reset to complete */
716                         ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESET),
717                                         status_reg);
718                         /* REVISIT:  some hardware needs 550+ usec to clear
719                          * this bit; seems too long to spin routinely...
720                          */
721                         retval = handshake(ehci, status_reg,
722                                         PORT_RESET, 0, 750);
723                         if (retval != 0) {
724                                 ehci_err (ehci, "port %d reset error %d\n",
725                                         wIndex + 1, retval);
726                                 goto error;
727                         }
728
729                         /* see what we found out */
730                         temp = check_reset_complete (ehci, wIndex, status_reg,
731                                         ehci_readl(ehci, status_reg));
732                 }
733
734                 /* transfer dedicated ports to the companion hc */
735                 if ((temp & PORT_CONNECT) &&
736                                 test_bit(wIndex, &ehci->companion_ports)) {
737                         temp &= ~PORT_RWC_BITS;
738                         temp |= PORT_OWNER;
739                         ehci_writel(ehci, temp, status_reg);
740                         ehci_dbg(ehci, "port %d --> companion\n", wIndex + 1);
741                         temp = ehci_readl(ehci, status_reg);
742                 }
743
744                 /*
745                  * Even if OWNER is set, there's no harm letting khubd
746                  * see the wPortStatus values (they should all be 0 except
747                  * for PORT_POWER anyway).
748                  */
749
750                 if (temp & PORT_CONNECT) {
751                         status |= 1 << USB_PORT_FEAT_CONNECTION;
752                         // status may be from integrated TT
753                         status |= ehci_port_speed(ehci, temp);
754                 }
755                 if (temp & PORT_PE)
756                         status |= 1 << USB_PORT_FEAT_ENABLE;
757                 if (temp & (PORT_SUSPEND|PORT_RESUME))
758                         status |= 1 << USB_PORT_FEAT_SUSPEND;
759                 if (temp & PORT_OC)
760                         status |= 1 << USB_PORT_FEAT_OVER_CURRENT;
761                 if (temp & PORT_RESET)
762                         status |= 1 << USB_PORT_FEAT_RESET;
763                 if (temp & PORT_POWER)
764                         status |= 1 << USB_PORT_FEAT_POWER;
765
766 #ifndef EHCI_VERBOSE_DEBUG
767         if (status & ~0xffff)   /* only if wPortChange is interesting */
768 #endif
769                 dbg_port (ehci, "GetStatus", wIndex + 1, temp);
770                 put_unaligned(cpu_to_le32 (status), (__le32 *) buf);
771                 break;
772         case SetHubFeature:
773                 switch (wValue) {
774                 case C_HUB_LOCAL_POWER:
775                 case C_HUB_OVER_CURRENT:
776                         /* no hub-wide feature/status flags */
777                         break;
778                 default:
779                         goto error;
780                 }
781                 break;
782         case SetPortFeature:
783                 selector = wIndex >> 8;
784                 wIndex &= 0xff;
785                 if (!wIndex || wIndex > ports)
786                         goto error;
787                 wIndex--;
788                 temp = ehci_readl(ehci, status_reg);
789                 if (temp & PORT_OWNER)
790                         break;
791
792                 temp &= ~PORT_RWC_BITS;
793                 switch (wValue) {
794                 case USB_PORT_FEAT_SUSPEND:
795                         if (ehci->no_selective_suspend)
796                                 break;
797                         if ((temp & PORT_PE) == 0
798                                         || (temp & PORT_RESET) != 0)
799                                 goto error;
800                         if (device_may_wakeup(&hcd->self.root_hub->dev))
801                                 temp |= PORT_WAKE_BITS;
802                         ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
803                         break;
804                 case USB_PORT_FEAT_POWER:
805                         if (HCS_PPC (ehci->hcs_params))
806                                 ehci_writel(ehci, temp | PORT_POWER,
807                                                 status_reg);
808                         break;
809                 case USB_PORT_FEAT_RESET:
810                         if (temp & PORT_RESUME)
811                                 goto error;
812                         /* line status bits may report this as low speed,
813                          * which can be fine if this root hub has a
814                          * transaction translator built in.
815                          */
816                         if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
817                                         && !ehci_is_TDI(ehci)
818                                         && PORT_USB11 (temp)) {
819                                 ehci_dbg (ehci,
820                                         "port %d low speed --> companion\n",
821                                         wIndex + 1);
822                                 temp |= PORT_OWNER;
823                         } else {
824                                 ehci_vdbg (ehci, "port %d reset\n", wIndex + 1);
825                                 temp |= PORT_RESET;
826                                 temp &= ~PORT_PE;
827
828                                 /*
829                                  * caller must wait, then call GetPortStatus
830                                  * usb 2.0 spec says 50 ms resets on root
831                                  */
832                                 ehci->reset_done [wIndex] = jiffies
833                                                 + msecs_to_jiffies (50);
834                         }
835                         ehci_writel(ehci, temp, status_reg);
836                         break;
837
838                 /* For downstream facing ports (these):  one hub port is put
839                  * into test mode according to USB2 11.24.2.13, then the hub
840                  * must be reset (which for root hub now means rmmod+modprobe,
841                  * or else system reboot).  See EHCI 2.3.9 and 4.14 for info
842                  * about the EHCI-specific stuff.
843                  */
844                 case USB_PORT_FEAT_TEST:
845                         if (!selector || selector > 5)
846                                 goto error;
847                         ehci_quiesce(ehci);
848                         ehci_halt(ehci);
849                         temp |= selector << 16;
850                         ehci_writel(ehci, temp, status_reg);
851                         break;
852
853                 default:
854                         goto error;
855                 }
856                 ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
857                 break;
858
859         default:
860 error:
861                 /* "stall" on error */
862                 retval = -EPIPE;
863         }
864         spin_unlock_irqrestore (&ehci->lock, flags);
865         return retval;
866 }