USB: ohci whitespace/comment fixups
[linux-2.6.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 /* hcd->hub_irq_enable() */
40 static void ohci_rhsc_enable (struct usb_hcd *hcd)
41 {
42         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
43
44         spin_lock_irq(&ohci->lock);
45         if (!ohci->autostop)
46                 del_timer(&hcd->rh_timer);      /* Prevent next poll */
47         ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrenable);
48         spin_unlock_irq(&ohci->lock);
49 }
50
51 #define OHCI_SCHED_ENABLES \
52         (OHCI_CTRL_CLE|OHCI_CTRL_BLE|OHCI_CTRL_PLE|OHCI_CTRL_IE)
53
54 static void dl_done_list (struct ohci_hcd *);
55 static void finish_unlinks (struct ohci_hcd *, u16);
56
57 #ifdef  CONFIG_PM
58 static int ohci_restart(struct ohci_hcd *ohci);
59
60 static int ohci_rh_suspend (struct ohci_hcd *ohci, int autostop)
61 __releases(ohci->lock)
62 __acquires(ohci->lock)
63 {
64         int                     status = 0;
65
66         ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
67         switch (ohci->hc_control & OHCI_CTRL_HCFS) {
68         case OHCI_USB_RESUME:
69                 ohci_dbg (ohci, "resume/suspend?\n");
70                 ohci->hc_control &= ~OHCI_CTRL_HCFS;
71                 ohci->hc_control |= OHCI_USB_RESET;
72                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
73                 (void) ohci_readl (ohci, &ohci->regs->control);
74                 /* FALL THROUGH */
75         case OHCI_USB_RESET:
76                 status = -EBUSY;
77                 ohci_dbg (ohci, "needs reinit!\n");
78                 goto done;
79         case OHCI_USB_SUSPEND:
80                 if (!ohci->autostop) {
81                         ohci_dbg (ohci, "already suspended\n");
82                         goto done;
83                 }
84         }
85         ohci_dbg (ohci, "%s root hub\n",
86                         autostop ? "auto-stop" : "suspend");
87
88         /* First stop any processing */
89         if (!autostop && (ohci->hc_control & OHCI_SCHED_ENABLES)) {
90                 ohci->hc_control &= ~OHCI_SCHED_ENABLES;
91                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
92                 ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
93                 ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrstatus);
94
95                 /* sched disables take effect on the next frame,
96                  * then the last WDH could take 6+ msec
97                  */
98                 ohci_dbg (ohci, "stopping schedules ...\n");
99                 ohci->autostop = 0;
100                 spin_unlock_irq (&ohci->lock);
101                 msleep (8);
102                 spin_lock_irq (&ohci->lock);
103         }
104         dl_done_list (ohci);
105         finish_unlinks (ohci, ohci_frame_no(ohci));
106
107         /* maybe resume can wake root hub */
108         if (device_may_wakeup(&ohci_to_hcd(ohci)->self.root_hub->dev) ||
109                         autostop)
110                 ohci->hc_control |= OHCI_CTRL_RWE;
111         else {
112                 ohci_writel (ohci, OHCI_INTR_RHSC, &ohci->regs->intrdisable);
113                 ohci->hc_control &= ~OHCI_CTRL_RWE;
114         }
115
116         /* Suspend hub ... this is the "global (to this bus) suspend" mode,
117          * which doesn't imply ports will first be individually suspended.
118          */
119         ohci->hc_control &= ~OHCI_CTRL_HCFS;
120         ohci->hc_control |= OHCI_USB_SUSPEND;
121         ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
122         (void) ohci_readl (ohci, &ohci->regs->control);
123
124         /* no resumes until devices finish suspending */
125         if (!autostop) {
126                 ohci->next_statechange = jiffies + msecs_to_jiffies (5);
127                 ohci->autostop = 0;
128         }
129
130 done:
131         return status;
132 }
133
134 static inline struct ed *find_head (struct ed *ed)
135 {
136         /* for bulk and control lists */
137         while (ed->ed_prev)
138                 ed = ed->ed_prev;
139         return ed;
140 }
141
142 /* caller has locked the root hub */
143 static int ohci_rh_resume (struct ohci_hcd *ohci)
144 __releases(ohci->lock)
145 __acquires(ohci->lock)
146 {
147         struct usb_hcd          *hcd = ohci_to_hcd (ohci);
148         u32                     temp, enables;
149         int                     status = -EINPROGRESS;
150         int                     autostopped = ohci->autostop;
151
152         ohci->autostop = 0;
153         ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
154
155         if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) {
156                 /* this can happen after resuming a swsusp snapshot */
157                 if (hcd->state == HC_STATE_RESUMING) {
158                         ohci_dbg (ohci, "BIOS/SMM active, control %03x\n",
159                                         ohci->hc_control);
160                         status = -EBUSY;
161                 /* this happens when pmcore resumes HC then root */
162                 } else {
163                         ohci_dbg (ohci, "duplicate resume\n");
164                         status = 0;
165                 }
166         } else switch (ohci->hc_control & OHCI_CTRL_HCFS) {
167         case OHCI_USB_SUSPEND:
168                 ohci->hc_control &= ~(OHCI_CTRL_HCFS|OHCI_SCHED_ENABLES);
169                 ohci->hc_control |= OHCI_USB_RESUME;
170                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
171                 (void) ohci_readl (ohci, &ohci->regs->control);
172                 ohci_dbg (ohci, "%s root hub\n",
173                                 autostopped ? "auto-start" : "resume");
174                 break;
175         case OHCI_USB_RESUME:
176                 /* HCFS changes sometime after INTR_RD */
177                 ohci_dbg(ohci, "%swakeup root hub\n",
178                                 autostopped ? "auto-" : "");
179                 break;
180         case OHCI_USB_OPER:
181                 /* this can happen after resuming a swsusp snapshot */
182                 ohci_dbg (ohci, "snapshot resume? reinit\n");
183                 status = -EBUSY;
184                 break;
185         default:                /* RESET, we lost power */
186                 ohci_dbg (ohci, "lost power\n");
187                 status = -EBUSY;
188         }
189         if (status == -EBUSY) {
190                 if (!autostopped) {
191                         spin_unlock_irq (&ohci->lock);
192                         (void) ohci_init (ohci);
193                         status = ohci_restart (ohci);
194                         spin_lock_irq (&ohci->lock);
195                 }
196                 return status;
197         }
198         if (status != -EINPROGRESS)
199                 return status;
200         if (autostopped)
201                 goto skip_resume;
202         spin_unlock_irq (&ohci->lock);
203
204         /* Some controllers (lucent erratum) need extra-long delays */
205         msleep (20 /* usb 11.5.1.10 */ + 12 /* 32 msec counter */ + 1);
206
207         temp = ohci_readl (ohci, &ohci->regs->control);
208         temp &= OHCI_CTRL_HCFS;
209         if (temp != OHCI_USB_RESUME) {
210                 ohci_err (ohci, "controller won't resume\n");
211                 spin_lock_irq(&ohci->lock);
212                 return -EBUSY;
213         }
214
215         /* disable old schedule state, reinit from scratch */
216         ohci_writel (ohci, 0, &ohci->regs->ed_controlhead);
217         ohci_writel (ohci, 0, &ohci->regs->ed_controlcurrent);
218         ohci_writel (ohci, 0, &ohci->regs->ed_bulkhead);
219         ohci_writel (ohci, 0, &ohci->regs->ed_bulkcurrent);
220         ohci_writel (ohci, 0, &ohci->regs->ed_periodcurrent);
221         ohci_writel (ohci, (u32) ohci->hcca_dma, &ohci->regs->hcca);
222
223         /* Sometimes PCI D3 suspend trashes frame timings ... */
224         periodic_reinit (ohci);
225
226         /* the following code is executed with ohci->lock held and
227          * irqs disabled if and only if autostopped is true
228          */
229
230 skip_resume:
231         /* interrupts might have been disabled */
232         ohci_writel (ohci, OHCI_INTR_INIT, &ohci->regs->intrenable);
233         if (ohci->ed_rm_list)
234                 ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrenable);
235
236         /* Then re-enable operations */
237         ohci_writel (ohci, OHCI_USB_OPER, &ohci->regs->control);
238         (void) ohci_readl (ohci, &ohci->regs->control);
239         if (!autostopped)
240                 msleep (3);
241
242         temp = ohci->hc_control;
243         temp &= OHCI_CTRL_RWC;
244         temp |= OHCI_CONTROL_INIT | OHCI_USB_OPER;
245         ohci->hc_control = temp;
246         ohci_writel (ohci, temp, &ohci->regs->control);
247         (void) ohci_readl (ohci, &ohci->regs->control);
248
249         /* TRSMRCY */
250         if (!autostopped) {
251                 msleep (10);
252                 spin_lock_irq (&ohci->lock);
253         }
254         /* now ohci->lock is always held and irqs are always disabled */
255
256         /* keep it alive for more than ~5x suspend + resume costs */
257         ohci->next_statechange = jiffies + STATECHANGE_DELAY;
258
259         /* maybe turn schedules back on */
260         enables = 0;
261         temp = 0;
262         if (!ohci->ed_rm_list) {
263                 if (ohci->ed_controltail) {
264                         ohci_writel (ohci,
265                                         find_head (ohci->ed_controltail)->dma,
266                                         &ohci->regs->ed_controlhead);
267                         enables |= OHCI_CTRL_CLE;
268                         temp |= OHCI_CLF;
269                 }
270                 if (ohci->ed_bulktail) {
271                         ohci_writel (ohci, find_head (ohci->ed_bulktail)->dma,
272                                 &ohci->regs->ed_bulkhead);
273                         enables |= OHCI_CTRL_BLE;
274                         temp |= OHCI_BLF;
275                 }
276         }
277         if (hcd->self.bandwidth_isoc_reqs || hcd->self.bandwidth_int_reqs)
278                 enables |= OHCI_CTRL_PLE|OHCI_CTRL_IE;
279         if (enables) {
280                 ohci_dbg (ohci, "restarting schedules ... %08x\n", enables);
281                 ohci->hc_control |= enables;
282                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
283                 if (temp)
284                         ohci_writel (ohci, temp, &ohci->regs->cmdstatus);
285                 (void) ohci_readl (ohci, &ohci->regs->control);
286         }
287
288         return 0;
289 }
290
291 static int ohci_bus_suspend (struct usb_hcd *hcd)
292 {
293         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
294         int                     rc;
295
296         spin_lock_irq (&ohci->lock);
297
298         if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
299                 rc = -ESHUTDOWN;
300         else
301                 rc = ohci_rh_suspend (ohci, 0);
302         spin_unlock_irq (&ohci->lock);
303         return rc;
304 }
305
306 static int ohci_bus_resume (struct usb_hcd *hcd)
307 {
308         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
309         int                     rc;
310
311         if (time_before (jiffies, ohci->next_statechange))
312                 msleep(5);
313
314         spin_lock_irq (&ohci->lock);
315
316         if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
317                 rc = -ESHUTDOWN;
318         else
319                 rc = ohci_rh_resume (ohci);
320         spin_unlock_irq (&ohci->lock);
321
322         /* poll until we know a device is connected or we autostop */
323         if (rc == 0)
324                 usb_hcd_poll_rh_status(hcd);
325         return rc;
326 }
327
328 /* Carry out polling-, autostop-, and autoresume-related state changes */
329 static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
330                 int any_connected)
331 {
332         int     poll_rh = 1;
333
334         switch (ohci->hc_control & OHCI_CTRL_HCFS) {
335
336         case OHCI_USB_OPER:
337                 /* keep on polling until we know a device is connected
338                  * and RHSC is enabled */
339                 if (!ohci->autostop) {
340                         if (any_connected ||
341                                         !device_may_wakeup(&ohci_to_hcd(ohci)
342                                                 ->self.root_hub->dev)) {
343                                 if (ohci_readl(ohci, &ohci->regs->intrenable) &
344                                                 OHCI_INTR_RHSC)
345                                         poll_rh = 0;
346                         } else {
347                                 ohci->autostop = 1;
348                                 ohci->next_statechange = jiffies + HZ;
349                         }
350
351                 /* if no devices have been attached for one second, autostop */
352                 } else {
353                         if (changed || any_connected) {
354                                 ohci->autostop = 0;
355                                 ohci->next_statechange = jiffies +
356                                                 STATECHANGE_DELAY;
357                         } else if (time_after_eq(jiffies,
358                                                 ohci->next_statechange)
359                                         && !ohci->ed_rm_list
360                                         && !(ohci->hc_control &
361                                                 OHCI_SCHED_ENABLES)) {
362                                 ohci_rh_suspend(ohci, 1);
363                         }
364                 }
365                 break;
366
367         /* if there is a port change, autostart or ask to be resumed */
368         case OHCI_USB_SUSPEND:
369         case OHCI_USB_RESUME:
370                 if (changed) {
371                         if (ohci->autostop)
372                                 ohci_rh_resume(ohci);
373                         else
374                                 usb_hcd_resume_root_hub(ohci_to_hcd(ohci));
375                 } else {
376                         /* everything is idle, no need for polling */
377                         poll_rh = 0;
378                 }
379                 break;
380         }
381         return poll_rh;
382 }
383
384 #else   /* CONFIG_PM */
385
386 static inline int ohci_rh_resume(struct ohci_hcd *ohci)
387 {
388         return 0;
389 }
390
391 /* Carry out polling-related state changes.
392  * autostop isn't used when CONFIG_PM is turned off.
393  */
394 static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
395                 int any_connected)
396 {
397         int     poll_rh = 1;
398
399         /* keep on polling until RHSC is enabled */
400         if (ohci_readl(ohci, &ohci->regs->intrenable) & OHCI_INTR_RHSC)
401                 poll_rh = 0;
402         return poll_rh;
403 }
404
405 #endif  /* CONFIG_PM */
406
407 /*-------------------------------------------------------------------------*/
408
409 /* build "status change" packet (one or two bytes) from HC registers */
410
411 static int
412 ohci_hub_status_data (struct usb_hcd *hcd, char *buf)
413 {
414         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
415         int             i, changed = 0, length = 1;
416         int             any_connected = 0;
417         unsigned long   flags;
418
419         spin_lock_irqsave (&ohci->lock, flags);
420
421         /* undocumented erratum seen on at least rev D */
422         if ((ohci->flags & OHCI_QUIRK_AMD756)
423                         && (roothub_a (ohci) & RH_A_NDP) > MAX_ROOT_PORTS) {
424                 ohci_warn (ohci, "bogus NDP, rereads as NDP=%d\n",
425                           ohci_readl (ohci, &ohci->regs->roothub.a) & RH_A_NDP);
426                 /* retry later; "should not happen" */
427                 goto done;
428         }
429
430         /* init status */
431         if (roothub_status (ohci) & (RH_HS_LPSC | RH_HS_OCIC))
432                 buf [0] = changed = 1;
433         else
434                 buf [0] = 0;
435         if (ohci->num_ports > 7) {
436                 buf [1] = 0;
437                 length++;
438         }
439
440         /* look at each port */
441         for (i = 0; i < ohci->num_ports; i++) {
442                 u32     status = roothub_portstatus (ohci, i);
443
444                 /* can't autostop if ports are connected */
445                 any_connected |= (status & RH_PS_CCS);
446
447                 if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC
448                                 | RH_PS_OCIC | RH_PS_PRSC)) {
449                         changed = 1;
450                         if (i < 7)
451                             buf [0] |= 1 << (i + 1);
452                         else
453                             buf [1] |= 1 << (i - 7);
454                 }
455         }
456
457         hcd->poll_rh = ohci_root_hub_state_changes(ohci, changed,
458                         any_connected);
459
460 done:
461         spin_unlock_irqrestore (&ohci->lock, flags);
462
463         return changed ? length : 0;
464 }
465
466 /*-------------------------------------------------------------------------*/
467
468 static void
469 ohci_hub_descriptor (
470         struct ohci_hcd                 *ohci,
471         struct usb_hub_descriptor       *desc
472 ) {
473         u32             rh = roothub_a (ohci);
474         u16             temp;
475
476         desc->bDescriptorType = 0x29;
477         desc->bPwrOn2PwrGood = (rh & RH_A_POTPGT) >> 24;
478         desc->bHubContrCurrent = 0;
479
480         desc->bNbrPorts = ohci->num_ports;
481         temp = 1 + (ohci->num_ports / 8);
482         desc->bDescLength = 7 + 2 * temp;
483
484         temp = 0;
485         if (rh & RH_A_NPS)              /* no power switching? */
486             temp |= 0x0002;
487         if (rh & RH_A_PSM)              /* per-port power switching? */
488             temp |= 0x0001;
489         if (rh & RH_A_NOCP)             /* no overcurrent reporting? */
490             temp |= 0x0010;
491         else if (rh & RH_A_OCPM)        /* per-port overcurrent reporting? */
492             temp |= 0x0008;
493         desc->wHubCharacteristics = (__force __u16)cpu_to_hc16(ohci, temp);
494
495         /* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
496         rh = roothub_b (ohci);
497         memset(desc->bitmap, 0xff, sizeof(desc->bitmap));
498         desc->bitmap [0] = rh & RH_B_DR;
499         if (ohci->num_ports > 7) {
500                 desc->bitmap [1] = (rh & RH_B_DR) >> 8;
501                 desc->bitmap [2] = 0xff;
502         } else
503                 desc->bitmap [1] = 0xff;
504 }
505
506 /*-------------------------------------------------------------------------*/
507
508 #ifdef  CONFIG_USB_OTG
509
510 static int ohci_start_port_reset (struct usb_hcd *hcd, unsigned port)
511 {
512         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
513         u32                     status;
514
515         if (!port)
516                 return -EINVAL;
517         port--;
518
519         /* start port reset before HNP protocol times out */
520         status = ohci_readl(ohci, &ohci->regs->roothub.portstatus [port]);
521         if (!(status & RH_PS_CCS))
522                 return -ENODEV;
523
524         /* khubd will finish the reset later */
525         ohci_writel(ohci, RH_PS_PRS, &ohci->regs->roothub.portstatus [port]);
526         return 0;
527 }
528
529 static void start_hnp(struct ohci_hcd *ohci);
530
531 #else
532
533 #define ohci_start_port_reset           NULL
534
535 #endif
536
537 /*-------------------------------------------------------------------------*/
538
539
540 /* See usb 7.1.7.5:  root hubs must issue at least 50 msec reset signaling,
541  * not necessarily continuous ... to guard against resume signaling.
542  * The short timeout is safe for non-root hubs, and is backward-compatible
543  * with earlier Linux hosts.
544  */
545 #ifdef  CONFIG_USB_SUSPEND
546 #define PORT_RESET_MSEC         50
547 #else
548 #define PORT_RESET_MSEC         10
549 #endif
550
551 /* this timer value might be vendor-specific ... */
552 #define PORT_RESET_HW_MSEC      10
553
554 /* wrap-aware logic morphed from <linux/jiffies.h> */
555 #define tick_before(t1,t2) ((s16)(((s16)(t1))-((s16)(t2))) < 0)
556
557 /* called from some task, normally khubd */
558 static inline void root_port_reset (struct ohci_hcd *ohci, unsigned port)
559 {
560         __hc32 __iomem *portstat = &ohci->regs->roothub.portstatus [port];
561         u32     temp;
562         u16     now = ohci_readl(ohci, &ohci->regs->fmnumber);
563         u16     reset_done = now + PORT_RESET_MSEC;
564
565         /* build a "continuous enough" reset signal, with up to
566          * 3msec gap between pulses.  scheduler HZ==100 must work;
567          * this might need to be deadline-scheduled.
568          */
569         do {
570                 /* spin until any current reset finishes */
571                 for (;;) {
572                         temp = ohci_readl (ohci, portstat);
573                         if (!(temp & RH_PS_PRS))
574                                 break;
575                         udelay (500);
576                 }
577
578                 if (!(temp & RH_PS_CCS))
579                         break;
580                 if (temp & RH_PS_PRSC)
581                         ohci_writel (ohci, RH_PS_PRSC, portstat);
582
583                 /* start the next reset, sleep till it's probably done */
584                 ohci_writel (ohci, RH_PS_PRS, portstat);
585                 msleep(PORT_RESET_HW_MSEC);
586                 now = ohci_readl(ohci, &ohci->regs->fmnumber);
587         } while (tick_before(now, reset_done));
588         /* caller synchronizes using PRSC */
589 }
590
591 static int ohci_hub_control (
592         struct usb_hcd  *hcd,
593         u16             typeReq,
594         u16             wValue,
595         u16             wIndex,
596         char            *buf,
597         u16             wLength
598 ) {
599         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
600         int             ports = hcd_to_bus (hcd)->root_hub->maxchild;
601         u32             temp;
602         int             retval = 0;
603
604         if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
605                 return -ESHUTDOWN;
606
607         switch (typeReq) {
608         case ClearHubFeature:
609                 switch (wValue) {
610                 case C_HUB_OVER_CURRENT:
611                         ohci_writel (ohci, RH_HS_OCIC,
612                                         &ohci->regs->roothub.status);
613                 case C_HUB_LOCAL_POWER:
614                         break;
615                 default:
616                         goto error;
617                 }
618                 break;
619         case ClearPortFeature:
620                 if (!wIndex || wIndex > ports)
621                         goto error;
622                 wIndex--;
623
624                 switch (wValue) {
625                 case USB_PORT_FEAT_ENABLE:
626                         temp = RH_PS_CCS;
627                         break;
628                 case USB_PORT_FEAT_C_ENABLE:
629                         temp = RH_PS_PESC;
630                         break;
631                 case USB_PORT_FEAT_SUSPEND:
632                         temp = RH_PS_POCI;
633                         break;
634                 case USB_PORT_FEAT_C_SUSPEND:
635                         temp = RH_PS_PSSC;
636                         break;
637                 case USB_PORT_FEAT_POWER:
638                         temp = RH_PS_LSDA;
639                         break;
640                 case USB_PORT_FEAT_C_CONNECTION:
641                         temp = RH_PS_CSC;
642                         break;
643                 case USB_PORT_FEAT_C_OVER_CURRENT:
644                         temp = RH_PS_OCIC;
645                         break;
646                 case USB_PORT_FEAT_C_RESET:
647                         temp = RH_PS_PRSC;
648                         break;
649                 default:
650                         goto error;
651                 }
652                 ohci_writel (ohci, temp,
653                                 &ohci->regs->roothub.portstatus [wIndex]);
654                 // ohci_readl (ohci, &ohci->regs->roothub.portstatus [wIndex]);
655                 break;
656         case GetHubDescriptor:
657                 ohci_hub_descriptor (ohci, (struct usb_hub_descriptor *) buf);
658                 break;
659         case GetHubStatus:
660                 temp = roothub_status (ohci) & ~(RH_HS_CRWE | RH_HS_DRWE);
661                 put_unaligned(cpu_to_le32 (temp), (__le32 *) buf);
662                 break;
663         case GetPortStatus:
664                 if (!wIndex || wIndex > ports)
665                         goto error;
666                 wIndex--;
667                 temp = roothub_portstatus (ohci, wIndex);
668                 put_unaligned(cpu_to_le32 (temp), (__le32 *) buf);
669
670 #ifndef OHCI_VERBOSE_DEBUG
671         if (*(u16*)(buf+2))     /* only if wPortChange is interesting */
672 #endif
673                 dbg_port (ohci, "GetStatus", wIndex, temp);
674                 break;
675         case SetHubFeature:
676                 switch (wValue) {
677                 case C_HUB_OVER_CURRENT:
678                         // FIXME:  this can be cleared, yes?
679                 case C_HUB_LOCAL_POWER:
680                         break;
681                 default:
682                         goto error;
683                 }
684                 break;
685         case SetPortFeature:
686                 if (!wIndex || wIndex > ports)
687                         goto error;
688                 wIndex--;
689                 switch (wValue) {
690                 case USB_PORT_FEAT_SUSPEND:
691 #ifdef  CONFIG_USB_OTG
692                         if (hcd->self.otg_port == (wIndex + 1)
693                                         && hcd->self.b_hnp_enable)
694                                 start_hnp(ohci);
695                         else
696 #endif
697                         ohci_writel (ohci, RH_PS_PSS,
698                                 &ohci->regs->roothub.portstatus [wIndex]);
699                         break;
700                 case USB_PORT_FEAT_POWER:
701                         ohci_writel (ohci, RH_PS_PPS,
702                                 &ohci->regs->roothub.portstatus [wIndex]);
703                         break;
704                 case USB_PORT_FEAT_RESET:
705                         root_port_reset (ohci, wIndex);
706                         break;
707                 default:
708                         goto error;
709                 }
710                 break;
711
712         default:
713 error:
714                 /* "protocol stall" on error */
715                 retval = -EPIPE;
716         }
717         return retval;
718 }
719