xhci: tegra: support HSIC ports
[linux-3.10.git] / drivers / usb / host / ohci-hub.c
1 /*
2  * OHCI HCD (Host Controller Driver) for USB.
3  *
4  * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
5  * (C) Copyright 2000-2004 David Brownell <dbrownell@users.sourceforge.net>
6  *
7  * This file is licenced under GPL
8  */
9
10 /*-------------------------------------------------------------------------*/
11
12 /*
13  * OHCI Root Hub ... the nonsharable stuff
14  */
15
16 #define dbg_port(hc,label,num,value) \
17         ohci_dbg (hc, \
18                 "%s roothub.portstatus [%d] " \
19                 "= 0x%08x%s%s%s%s%s%s%s%s%s%s%s%s\n", \
20                 label, num, temp, \
21                 (temp & RH_PS_PRSC) ? " PRSC" : "", \
22                 (temp & RH_PS_OCIC) ? " OCIC" : "", \
23                 (temp & RH_PS_PSSC) ? " PSSC" : "", \
24                 (temp & RH_PS_PESC) ? " PESC" : "", \
25                 (temp & RH_PS_CSC) ? " CSC" : "", \
26                 \
27                 (temp & RH_PS_LSDA) ? " LSDA" : "", \
28                 (temp & RH_PS_PPS) ? " PPS" : "", \
29                 (temp & RH_PS_PRS) ? " PRS" : "", \
30                 (temp & RH_PS_POCI) ? " POCI" : "", \
31                 (temp & RH_PS_PSS) ? " PSS" : "", \
32                 \
33                 (temp & RH_PS_PES) ? " PES" : "", \
34                 (temp & RH_PS_CCS) ? " CCS" : "" \
35                 );
36
37 /*-------------------------------------------------------------------------*/
38
39 #define OHCI_SCHED_ENABLES \
40         (OHCI_CTRL_CLE|OHCI_CTRL_BLE|OHCI_CTRL_PLE|OHCI_CTRL_IE)
41
42 static void dl_done_list (struct ohci_hcd *);
43 static void finish_unlinks (struct ohci_hcd *, u16);
44
45 #ifdef  CONFIG_PM
46 static int ohci_rh_suspend (struct ohci_hcd *ohci, int autostop)
47 __releases(ohci->lock)
48 __acquires(ohci->lock)
49 {
50         int                     status = 0;
51
52         ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
53         switch (ohci->hc_control & OHCI_CTRL_HCFS) {
54         case OHCI_USB_RESUME:
55                 ohci_dbg (ohci, "resume/suspend?\n");
56                 ohci->hc_control &= ~OHCI_CTRL_HCFS;
57                 ohci->hc_control |= OHCI_USB_RESET;
58                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
59                 (void) ohci_readl (ohci, &ohci->regs->control);
60                 /* FALL THROUGH */
61         case OHCI_USB_RESET:
62                 status = -EBUSY;
63                 ohci_dbg (ohci, "needs reinit!\n");
64                 goto done;
65         case OHCI_USB_SUSPEND:
66                 if (!ohci->autostop) {
67                         ohci_dbg (ohci, "already suspended\n");
68                         goto done;
69                 }
70         }
71         ohci_dbg (ohci, "%s root hub\n",
72                         autostop ? "auto-stop" : "suspend");
73
74         /* First stop any processing */
75         if (!autostop && (ohci->hc_control & OHCI_SCHED_ENABLES)) {
76                 ohci->hc_control &= ~OHCI_SCHED_ENABLES;
77                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
78                 ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
79                 ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrstatus);
80
81                 /* sched disables take effect on the next frame,
82                  * then the last WDH could take 6+ msec
83                  */
84                 ohci_dbg (ohci, "stopping schedules ...\n");
85                 ohci->autostop = 0;
86                 spin_unlock_irq (&ohci->lock);
87                 msleep (8);
88                 spin_lock_irq (&ohci->lock);
89         }
90         dl_done_list (ohci);
91         finish_unlinks (ohci, ohci_frame_no(ohci));
92
93         /* maybe resume can wake root hub */
94         if (ohci_to_hcd(ohci)->self.root_hub->do_remote_wakeup || autostop) {
95                 ohci->hc_control |= OHCI_CTRL_RWE;
96         } else {
97                 ohci_writel(ohci, OHCI_INTR_RHSC | OHCI_INTR_RD,
98                                 &ohci->regs->intrdisable);
99                 ohci->hc_control &= ~OHCI_CTRL_RWE;
100         }
101
102         /* Suspend hub ... this is the "global (to this bus) suspend" mode,
103          * which doesn't imply ports will first be individually suspended.
104          */
105         ohci->hc_control &= ~OHCI_CTRL_HCFS;
106         ohci->hc_control |= OHCI_USB_SUSPEND;
107         ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
108         (void) ohci_readl (ohci, &ohci->regs->control);
109
110         /* no resumes until devices finish suspending */
111         if (!autostop) {
112                 ohci->next_statechange = jiffies + msecs_to_jiffies (5);
113                 ohci->autostop = 0;
114                 ohci->rh_state = OHCI_RH_SUSPENDED;
115         }
116
117 done:
118         return status;
119 }
120
121 static inline struct ed *find_head (struct ed *ed)
122 {
123         /* for bulk and control lists */
124         while (ed->ed_prev)
125                 ed = ed->ed_prev;
126         return ed;
127 }
128
129 /* caller has locked the root hub */
130 static int ohci_rh_resume (struct ohci_hcd *ohci)
131 __releases(ohci->lock)
132 __acquires(ohci->lock)
133 {
134         struct usb_hcd          *hcd = ohci_to_hcd (ohci);
135         u32                     temp, enables;
136         int                     status = -EINPROGRESS;
137         int                     autostopped = ohci->autostop;
138
139         ohci->autostop = 0;
140         ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
141
142         if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) {
143                 /* this can happen after resuming a swsusp snapshot */
144                 if (ohci->rh_state != OHCI_RH_RUNNING) {
145                         ohci_dbg (ohci, "BIOS/SMM active, control %03x\n",
146                                         ohci->hc_control);
147                         status = -EBUSY;
148                 /* this happens when pmcore resumes HC then root */
149                 } else {
150                         ohci_dbg (ohci, "duplicate resume\n");
151                         status = 0;
152                 }
153         } else switch (ohci->hc_control & OHCI_CTRL_HCFS) {
154         case OHCI_USB_SUSPEND:
155                 ohci->hc_control &= ~(OHCI_CTRL_HCFS|OHCI_SCHED_ENABLES);
156                 ohci->hc_control |= OHCI_USB_RESUME;
157                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
158                 (void) ohci_readl (ohci, &ohci->regs->control);
159                 ohci_dbg (ohci, "%s root hub\n",
160                                 autostopped ? "auto-start" : "resume");
161                 break;
162         case OHCI_USB_RESUME:
163                 /* HCFS changes sometime after INTR_RD */
164                 ohci_dbg(ohci, "%swakeup root hub\n",
165                                 autostopped ? "auto-" : "");
166                 break;
167         case OHCI_USB_OPER:
168                 /* this can happen after resuming a swsusp snapshot */
169                 ohci_dbg (ohci, "snapshot resume? reinit\n");
170                 status = -EBUSY;
171                 break;
172         default:                /* RESET, we lost power */
173                 ohci_dbg (ohci, "lost power\n");
174                 status = -EBUSY;
175         }
176         if (status == -EBUSY) {
177                 if (!autostopped) {
178                         spin_unlock_irq (&ohci->lock);
179                         (void) ohci_init (ohci);
180                         status = ohci_restart (ohci);
181
182                         usb_root_hub_lost_power(hcd->self.root_hub);
183
184                         spin_lock_irq (&ohci->lock);
185                 }
186                 return status;
187         }
188         if (status != -EINPROGRESS)
189                 return status;
190         if (autostopped)
191                 goto skip_resume;
192         spin_unlock_irq (&ohci->lock);
193
194         /* Some controllers (lucent erratum) need extra-long delays */
195         msleep (20 /* usb 11.5.1.10 */ + 12 /* 32 msec counter */ + 1);
196
197         temp = ohci_readl (ohci, &ohci->regs->control);
198         temp &= OHCI_CTRL_HCFS;
199         if (temp != OHCI_USB_RESUME) {
200                 ohci_err (ohci, "controller won't resume\n");
201                 spin_lock_irq(&ohci->lock);
202                 return -EBUSY;
203         }
204
205         /* disable old schedule state, reinit from scratch */
206         ohci_writel (ohci, 0, &ohci->regs->ed_controlhead);
207         ohci_writel (ohci, 0, &ohci->regs->ed_controlcurrent);
208         ohci_writel (ohci, 0, &ohci->regs->ed_bulkhead);
209         ohci_writel (ohci, 0, &ohci->regs->ed_bulkcurrent);
210         ohci_writel (ohci, 0, &ohci->regs->ed_periodcurrent);
211         ohci_writel (ohci, (u32) ohci->hcca_dma, &ohci->regs->hcca);
212
213         /* Sometimes PCI D3 suspend trashes frame timings ... */
214         periodic_reinit (ohci);
215
216         /* the following code is executed with ohci->lock held and
217          * irqs disabled if and only if autostopped is true
218          */
219
220 skip_resume:
221         /* interrupts might have been disabled */
222         ohci_writel (ohci, OHCI_INTR_INIT, &ohci->regs->intrenable);
223         if (ohci->ed_rm_list)
224                 ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrenable);
225
226         /* Then re-enable operations */
227         ohci_writel (ohci, OHCI_USB_OPER, &ohci->regs->control);
228         (void) ohci_readl (ohci, &ohci->regs->control);
229         if (!autostopped)
230                 msleep (3);
231
232         temp = ohci->hc_control;
233         temp &= OHCI_CTRL_RWC;
234         temp |= OHCI_CONTROL_INIT | OHCI_USB_OPER;
235         ohci->hc_control = temp;
236         ohci_writel (ohci, temp, &ohci->regs->control);
237         (void) ohci_readl (ohci, &ohci->regs->control);
238
239         /* TRSMRCY */
240         if (!autostopped) {
241                 msleep (10);
242                 spin_lock_irq (&ohci->lock);
243         }
244         /* now ohci->lock is always held and irqs are always disabled */
245
246         /* keep it alive for more than ~5x suspend + resume costs */
247         ohci->next_statechange = jiffies + STATECHANGE_DELAY;
248
249         /* maybe turn schedules back on */
250         enables = 0;
251         temp = 0;
252         if (!ohci->ed_rm_list) {
253                 if (ohci->ed_controltail) {
254                         ohci_writel (ohci,
255                                         find_head (ohci->ed_controltail)->dma,
256                                         &ohci->regs->ed_controlhead);
257                         enables |= OHCI_CTRL_CLE;
258                         temp |= OHCI_CLF;
259                 }
260                 if (ohci->ed_bulktail) {
261                         ohci_writel (ohci, find_head (ohci->ed_bulktail)->dma,
262                                 &ohci->regs->ed_bulkhead);
263                         enables |= OHCI_CTRL_BLE;
264                         temp |= OHCI_BLF;
265                 }
266         }
267         if (hcd->self.bandwidth_isoc_reqs || hcd->self.bandwidth_int_reqs)
268                 enables |= OHCI_CTRL_PLE|OHCI_CTRL_IE;
269         if (enables) {
270                 ohci_dbg (ohci, "restarting schedules ... %08x\n", enables);
271                 ohci->hc_control |= enables;
272                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
273                 if (temp)
274                         ohci_writel (ohci, temp, &ohci->regs->cmdstatus);
275                 (void) ohci_readl (ohci, &ohci->regs->control);
276         }
277
278         ohci->rh_state = OHCI_RH_RUNNING;
279         return 0;
280 }
281
282 static int ohci_bus_suspend (struct usb_hcd *hcd)
283 {
284         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
285         int                     rc;
286
287         spin_lock_irq (&ohci->lock);
288
289         if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
290                 rc = -ESHUTDOWN;
291         else
292                 rc = ohci_rh_suspend (ohci, 0);
293         spin_unlock_irq (&ohci->lock);
294         return rc;
295 }
296
297 static int ohci_bus_resume (struct usb_hcd *hcd)
298 {
299         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
300         int                     rc;
301
302         if (time_before (jiffies, ohci->next_statechange))
303                 msleep(5);
304
305         spin_lock_irq (&ohci->lock);
306
307         if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
308                 rc = -ESHUTDOWN;
309         else
310                 rc = ohci_rh_resume (ohci);
311         spin_unlock_irq (&ohci->lock);
312
313         /* poll until we know a device is connected or we autostop */
314         if (rc == 0)
315                 usb_hcd_poll_rh_status(hcd);
316         return rc;
317 }
318
319 /* Carry out polling-, autostop-, and autoresume-related state changes */
320 static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
321                 int any_connected, int rhsc_status)
322 {
323         int     poll_rh = 1;
324         int     rhsc_enable;
325
326         /* Some broken controllers never turn off RHSC in the interrupt
327          * status register.  For their sake we won't re-enable RHSC
328          * interrupts if the interrupt bit is already active.
329          */
330         rhsc_enable = ohci_readl(ohci, &ohci->regs->intrenable) &
331                         OHCI_INTR_RHSC;
332
333         switch (ohci->hc_control & OHCI_CTRL_HCFS) {
334         case OHCI_USB_OPER:
335                 /* If no status changes are pending, enable RHSC interrupts. */
336                 if (!rhsc_enable && !rhsc_status && !changed) {
337                         rhsc_enable = OHCI_INTR_RHSC;
338                         ohci_writel(ohci, rhsc_enable, &ohci->regs->intrenable);
339                 }
340
341                 /* Keep on polling until we know a device is connected
342                  * and RHSC is enabled, or until we autostop.
343                  */
344                 if (!ohci->autostop) {
345                         if (any_connected ||
346                                         !device_may_wakeup(&ohci_to_hcd(ohci)
347                                                 ->self.root_hub->dev)) {
348                                 if (rhsc_enable)
349                                         poll_rh = 0;
350                         } else {
351                                 ohci->autostop = 1;
352                                 ohci->next_statechange = jiffies + HZ;
353                         }
354
355                 /* if no devices have been attached for one second, autostop */
356                 } else {
357                         if (changed || any_connected) {
358                                 ohci->autostop = 0;
359                                 ohci->next_statechange = jiffies +
360                                                 STATECHANGE_DELAY;
361                         } else if (time_after_eq(jiffies,
362                                                 ohci->next_statechange)
363                                         && !ohci->ed_rm_list
364                                         && !(ohci->hc_control &
365                                                 OHCI_SCHED_ENABLES)) {
366                                 ohci_rh_suspend(ohci, 1);
367                                 if (rhsc_enable)
368                                         poll_rh = 0;
369                         }
370                 }
371                 break;
372
373         case OHCI_USB_SUSPEND:
374         case OHCI_USB_RESUME:
375                 /* if there is a port change, autostart or ask to be resumed */
376                 if (changed) {
377                         if (ohci->autostop)
378                                 ohci_rh_resume(ohci);
379                         else
380                                 usb_hcd_resume_root_hub(ohci_to_hcd(ohci));
381
382                 /* If remote wakeup is disabled, stop polling */
383                 } else if (!ohci->autostop &&
384                                 !ohci_to_hcd(ohci)->self.root_hub->
385                                         do_remote_wakeup) {
386                         poll_rh = 0;
387
388                 } else {
389                         /* If no status changes are pending,
390                          * enable RHSC interrupts
391                          */
392                         if (!rhsc_enable && !rhsc_status) {
393                                 rhsc_enable = OHCI_INTR_RHSC;
394                                 ohci_writel(ohci, rhsc_enable,
395                                                 &ohci->regs->intrenable);
396                         }
397                         /* Keep polling until RHSC is enabled */
398                         if (rhsc_enable)
399                                 poll_rh = 0;
400                 }
401                 break;
402         }
403         return poll_rh;
404 }
405
406 #else   /* CONFIG_PM */
407
408 static inline int ohci_rh_resume(struct ohci_hcd *ohci)
409 {
410         return 0;
411 }
412
413 /* Carry out polling-related state changes.
414  * autostop isn't used when CONFIG_PM is turned off.
415  */
416 static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
417                 int any_connected, int rhsc_status)
418 {
419         /* If RHSC is enabled, don't poll */
420         if (ohci_readl(ohci, &ohci->regs->intrenable) & OHCI_INTR_RHSC)
421                 return 0;
422
423         /* If status changes are pending, continue polling.
424          * Conversely, if no status changes are pending but the RHSC
425          * status bit was set, then RHSC may be broken so continue polling.
426          */
427         if (changed || rhsc_status)
428                 return 1;
429
430         /* It's safe to re-enable RHSC interrupts */
431         ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrenable);
432         return 0;
433 }
434
435 #endif  /* CONFIG_PM */
436
437 /*-------------------------------------------------------------------------*/
438
439 /* build "status change" packet (one or two bytes) from HC registers */
440
441 static int
442 ohci_hub_status_data (struct usb_hcd *hcd, char *buf)
443 {
444         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
445         int             i, changed = 0, length = 1;
446         int             any_connected = 0;
447         int             rhsc_status;
448         unsigned long   flags;
449
450         spin_lock_irqsave (&ohci->lock, flags);
451         if (!HCD_HW_ACCESSIBLE(hcd))
452                 goto done;
453
454         /* undocumented erratum seen on at least rev D */
455         if ((ohci->flags & OHCI_QUIRK_AMD756)
456                         && (roothub_a (ohci) & RH_A_NDP) > MAX_ROOT_PORTS) {
457                 ohci_warn (ohci, "bogus NDP, rereads as NDP=%d\n",
458                           ohci_readl (ohci, &ohci->regs->roothub.a) & RH_A_NDP);
459                 /* retry later; "should not happen" */
460                 goto done;
461         }
462
463         /* init status */
464         if (roothub_status (ohci) & (RH_HS_LPSC | RH_HS_OCIC))
465                 buf [0] = changed = 1;
466         else
467                 buf [0] = 0;
468         if (ohci->num_ports > 7) {
469                 buf [1] = 0;
470                 length++;
471         }
472
473         /* Clear the RHSC status flag before reading the port statuses */
474         ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrstatus);
475         rhsc_status = ohci_readl(ohci, &ohci->regs->intrstatus) &
476                         OHCI_INTR_RHSC;
477
478         /* look at each port */
479         for (i = 0; i < ohci->num_ports; i++) {
480                 u32     status = roothub_portstatus (ohci, i);
481
482                 /* can't autostop if ports are connected */
483                 any_connected |= (status & RH_PS_CCS);
484
485                 if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC
486                                 | RH_PS_OCIC | RH_PS_PRSC)) {
487                         changed = 1;
488                         if (i < 7)
489                             buf [0] |= 1 << (i + 1);
490                         else
491                             buf [1] |= 1 << (i - 7);
492                 }
493         }
494
495         if (ohci_root_hub_state_changes(ohci, changed,
496                         any_connected, rhsc_status))
497                 set_bit(HCD_FLAG_POLL_RH, &hcd->flags);
498         else
499                 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
500
501
502 done:
503         spin_unlock_irqrestore (&ohci->lock, flags);
504
505         return changed ? length : 0;
506 }
507
508 /*-------------------------------------------------------------------------*/
509
510 static void
511 ohci_hub_descriptor (
512         struct ohci_hcd                 *ohci,
513         struct usb_hub_descriptor       *desc
514 ) {
515         u32             rh = roothub_a (ohci);
516         u16             temp;
517
518         desc->bDescriptorType = 0x29;
519         desc->bPwrOn2PwrGood = (rh & RH_A_POTPGT) >> 24;
520         desc->bHubContrCurrent = 0;
521
522         desc->bNbrPorts = ohci->num_ports;
523         temp = 1 + (ohci->num_ports / 8);
524         desc->bDescLength = 7 + 2 * temp;
525
526         temp = 0;
527         if (rh & RH_A_NPS)              /* no power switching? */
528             temp |= 0x0002;
529         if (rh & RH_A_PSM)              /* per-port power switching? */
530             temp |= 0x0001;
531         if (rh & RH_A_NOCP)             /* no overcurrent reporting? */
532             temp |= 0x0010;
533         else if (rh & RH_A_OCPM)        /* per-port overcurrent reporting? */
534             temp |= 0x0008;
535         desc->wHubCharacteristics = (__force __u16)cpu_to_hc16(ohci, temp);
536
537         /* ports removable, and usb 1.0 legacy PortPwrCtrlMask */
538         rh = roothub_b (ohci);
539         memset(desc->u.hs.DeviceRemovable, 0xff,
540                         sizeof(desc->u.hs.DeviceRemovable));
541         desc->u.hs.DeviceRemovable[0] = rh & RH_B_DR;
542         if (ohci->num_ports > 7) {
543                 desc->u.hs.DeviceRemovable[1] = (rh & RH_B_DR) >> 8;
544                 desc->u.hs.DeviceRemovable[2] = 0xff;
545         } else
546                 desc->u.hs.DeviceRemovable[1] = 0xff;
547 }
548
549 /*-------------------------------------------------------------------------*/
550
551 #ifdef  CONFIG_USB_OTG
552
553 static int ohci_start_port_reset (struct usb_hcd *hcd, unsigned port)
554 {
555         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
556         u32                     status;
557
558         if (!port)
559                 return -EINVAL;
560         port--;
561
562         /* start port reset before HNP protocol times out */
563         status = ohci_readl(ohci, &ohci->regs->roothub.portstatus [port]);
564         if (!(status & RH_PS_CCS))
565                 return -ENODEV;
566
567         /* khubd will finish the reset later */
568         ohci_writel(ohci, RH_PS_PRS, &ohci->regs->roothub.portstatus [port]);
569         return 0;
570 }
571
572 #else
573
574 #define ohci_start_port_reset           NULL
575
576 #endif
577
578 /*-------------------------------------------------------------------------*/
579
580
581 /* See usb 7.1.7.5:  root hubs must issue at least 50 msec reset signaling,
582  * not necessarily continuous ... to guard against resume signaling.
583  */
584 #define PORT_RESET_MSEC         50
585
586 /* this timer value might be vendor-specific ... */
587 #define PORT_RESET_HW_MSEC      10
588
589 /* wrap-aware logic morphed from <linux/jiffies.h> */
590 #define tick_before(t1,t2) ((s16)(((s16)(t1))-((s16)(t2))) < 0)
591
592 /* called from some task, normally khubd */
593 static inline int root_port_reset (struct ohci_hcd *ohci, unsigned port)
594 {
595         __hc32 __iomem *portstat = &ohci->regs->roothub.portstatus [port];
596         u32     temp = 0;
597         u16     now = ohci_readl(ohci, &ohci->regs->fmnumber);
598         u16     reset_done = now + PORT_RESET_MSEC;
599         int     limit_1 = DIV_ROUND_UP(PORT_RESET_MSEC, PORT_RESET_HW_MSEC);
600
601         /* build a "continuous enough" reset signal, with up to
602          * 3msec gap between pulses.  scheduler HZ==100 must work;
603          * this might need to be deadline-scheduled.
604          */
605         do {
606                 int limit_2;
607
608                 /* spin until any current reset finishes */
609                 limit_2 = PORT_RESET_HW_MSEC * 2;
610                 while (--limit_2 >= 0) {
611                         temp = ohci_readl (ohci, portstat);
612                         /* handle e.g. CardBus eject */
613                         if (temp == ~(u32)0)
614                                 return -ESHUTDOWN;
615                         if (!(temp & RH_PS_PRS))
616                                 break;
617                         udelay (500);
618                 }
619
620                 /* timeout (a hardware error) has been observed when
621                  * EHCI sets CF while this driver is resetting a port;
622                  * presumably other disconnect paths might do it too.
623                  */
624                 if (limit_2 < 0) {
625                         ohci_dbg(ohci,
626                                 "port[%d] reset timeout, stat %08x\n",
627                                 port, temp);
628                         break;
629                 }
630
631                 if (!(temp & RH_PS_CCS))
632                         break;
633                 if (temp & RH_PS_PRSC)
634                         ohci_writel (ohci, RH_PS_PRSC, portstat);
635
636                 /* start the next reset, sleep till it's probably done */
637                 ohci_writel (ohci, RH_PS_PRS, portstat);
638                 msleep(PORT_RESET_HW_MSEC);
639                 now = ohci_readl(ohci, &ohci->regs->fmnumber);
640         } while (tick_before(now, reset_done) && --limit_1 >= 0);
641
642         /* caller synchronizes using PRSC ... and handles PRS
643          * still being set when this returns.
644          */
645
646         return 0;
647 }
648
649 static int ohci_hub_control (
650         struct usb_hcd  *hcd,
651         u16             typeReq,
652         u16             wValue,
653         u16             wIndex,
654         char            *buf,
655         u16             wLength
656 ) {
657         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
658         int             ports = ohci->num_ports;
659         u32             temp;
660         int             retval = 0;
661
662         if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
663                 return -ESHUTDOWN;
664
665         switch (typeReq) {
666         case ClearHubFeature:
667                 switch (wValue) {
668                 case C_HUB_OVER_CURRENT:
669                         ohci_writel (ohci, RH_HS_OCIC,
670                                         &ohci->regs->roothub.status);
671                 case C_HUB_LOCAL_POWER:
672                         break;
673                 default:
674                         goto error;
675                 }
676                 break;
677         case ClearPortFeature:
678                 if (!wIndex || wIndex > ports)
679                         goto error;
680                 wIndex--;
681
682                 switch (wValue) {
683                 case USB_PORT_FEAT_ENABLE:
684                         temp = RH_PS_CCS;
685                         break;
686                 case USB_PORT_FEAT_C_ENABLE:
687                         temp = RH_PS_PESC;
688                         break;
689                 case USB_PORT_FEAT_SUSPEND:
690                         temp = RH_PS_POCI;
691                         break;
692                 case USB_PORT_FEAT_C_SUSPEND:
693                         temp = RH_PS_PSSC;
694                         break;
695                 case USB_PORT_FEAT_POWER:
696                         temp = RH_PS_LSDA;
697                         break;
698                 case USB_PORT_FEAT_C_CONNECTION:
699                         temp = RH_PS_CSC;
700                         break;
701                 case USB_PORT_FEAT_C_OVER_CURRENT:
702                         temp = RH_PS_OCIC;
703                         break;
704                 case USB_PORT_FEAT_C_RESET:
705                         temp = RH_PS_PRSC;
706                         break;
707                 default:
708                         goto error;
709                 }
710                 ohci_writel (ohci, temp,
711                                 &ohci->regs->roothub.portstatus [wIndex]);
712                 // ohci_readl (ohci, &ohci->regs->roothub.portstatus [wIndex]);
713                 break;
714         case GetHubDescriptor:
715                 ohci_hub_descriptor (ohci, (struct usb_hub_descriptor *) buf);
716                 break;
717         case GetHubStatus:
718                 temp = roothub_status (ohci) & ~(RH_HS_CRWE | RH_HS_DRWE);
719                 put_unaligned_le32(temp, buf);
720                 break;
721         case GetPortStatus:
722                 if (!wIndex || wIndex > ports)
723                         goto error;
724                 wIndex--;
725                 temp = roothub_portstatus (ohci, wIndex);
726                 put_unaligned_le32(temp, buf);
727
728 #ifndef OHCI_VERBOSE_DEBUG
729         if (*(u16*)(buf+2))     /* only if wPortChange is interesting */
730 #endif
731                 dbg_port (ohci, "GetStatus", wIndex, temp);
732                 break;
733         case SetHubFeature:
734                 switch (wValue) {
735                 case C_HUB_OVER_CURRENT:
736                         // FIXME:  this can be cleared, yes?
737                 case C_HUB_LOCAL_POWER:
738                         break;
739                 default:
740                         goto error;
741                 }
742                 break;
743         case SetPortFeature:
744                 if (!wIndex || wIndex > ports)
745                         goto error;
746                 wIndex--;
747                 switch (wValue) {
748                 case USB_PORT_FEAT_SUSPEND:
749 #ifdef  CONFIG_USB_OTG
750                         if (hcd->self.otg_port == (wIndex + 1)
751                                         && hcd->self.b_hnp_enable)
752                                 ohci->start_hnp(ohci);
753                         else
754 #endif
755                         ohci_writel (ohci, RH_PS_PSS,
756                                 &ohci->regs->roothub.portstatus [wIndex]);
757                         break;
758                 case USB_PORT_FEAT_POWER:
759                         ohci_writel (ohci, RH_PS_PPS,
760                                 &ohci->regs->roothub.portstatus [wIndex]);
761                         break;
762                 case USB_PORT_FEAT_RESET:
763                         retval = root_port_reset (ohci, wIndex);
764                         break;
765                 default:
766                         goto error;
767                 }
768                 break;
769
770         default:
771 error:
772                 /* "protocol stall" on error */
773                 retval = -EPIPE;
774         }
775         return retval;
776 }
777