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