xref: /linux/drivers/usb/host/ohci-hub.c (revision 6e8331ac6973435b1e7604c30f2ad394035b46e1)
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 #ifdef	CONFIG_PM
40 
41 #define OHCI_SCHED_ENABLES \
42 	(OHCI_CTRL_CLE|OHCI_CTRL_BLE|OHCI_CTRL_PLE|OHCI_CTRL_IE)
43 
44 static void dl_done_list (struct ohci_hcd *, struct pt_regs *);
45 static void finish_unlinks (struct ohci_hcd *, u16 , struct pt_regs *);
46 static int ohci_restart (struct ohci_hcd *ohci);
47 
48 static int ohci_bus_suspend (struct usb_hcd *hcd)
49 {
50 	struct ohci_hcd		*ohci = hcd_to_ohci (hcd);
51 	int			status = 0;
52 	unsigned long		flags;
53 
54 	spin_lock_irqsave (&ohci->lock, flags);
55 
56 	if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))) {
57 		spin_unlock_irqrestore (&ohci->lock, flags);
58 		return -ESHUTDOWN;
59 	}
60 
61 	ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
62 	switch (ohci->hc_control & OHCI_CTRL_HCFS) {
63 	case OHCI_USB_RESUME:
64 		ohci_dbg (ohci, "resume/suspend?\n");
65 		ohci->hc_control &= ~OHCI_CTRL_HCFS;
66 		ohci->hc_control |= OHCI_USB_RESET;
67 		ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
68 		(void) ohci_readl (ohci, &ohci->regs->control);
69 		/* FALL THROUGH */
70 	case OHCI_USB_RESET:
71 		status = -EBUSY;
72 		ohci_dbg (ohci, "needs reinit!\n");
73 		goto done;
74 	case OHCI_USB_SUSPEND:
75 		ohci_dbg (ohci, "already suspended\n");
76 		goto done;
77 	}
78 	ohci_dbg (ohci, "suspend root hub\n");
79 
80 	/* First stop any processing */
81 	if (ohci->hc_control & OHCI_SCHED_ENABLES) {
82 		int		limit;
83 
84 		ohci->hc_control &= ~OHCI_SCHED_ENABLES;
85 		ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
86 		ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
87 		ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrstatus);
88 
89 		/* sched disables take effect on the next frame,
90 		 * then the last WDH could take 6+ msec
91 		 */
92 		ohci_dbg (ohci, "stopping schedules ...\n");
93 		limit = 2000;
94 		while (limit > 0) {
95 			udelay (250);
96 			limit =- 250;
97 			if (ohci_readl (ohci, &ohci->regs->intrstatus)
98 					& OHCI_INTR_SF)
99 				break;
100 		}
101 		dl_done_list (ohci, NULL);
102 		mdelay (7);
103 	}
104 	dl_done_list (ohci, NULL);
105 	finish_unlinks (ohci, ohci_frame_no(ohci), NULL);
106 	ohci_writel (ohci, ohci_readl (ohci, &ohci->regs->intrstatus),
107 			&ohci->regs->intrstatus);
108 
109 	/* maybe resume can wake root hub */
110 	if (device_may_wakeup(&ohci_to_hcd(ohci)->self.root_hub->dev))
111 		ohci->hc_control |= OHCI_CTRL_RWE;
112 	else
113 		ohci->hc_control &= ~OHCI_CTRL_RWE;
114 
115 	/* Suspend hub ... this is the "global (to this bus) suspend" mode,
116 	 * which doesn't imply ports will first be individually suspended.
117 	 */
118 	ohci->hc_control &= ~OHCI_CTRL_HCFS;
119 	ohci->hc_control |= OHCI_USB_SUSPEND;
120 	ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
121 	(void) ohci_readl (ohci, &ohci->regs->control);
122 
123 	/* no resumes until devices finish suspending */
124 	ohci->next_statechange = jiffies + msecs_to_jiffies (5);
125 
126 done:
127 	/* external suspend vs self autosuspend ... same effect */
128 	if (status == 0)
129 		usb_hcd_suspend_root_hub(hcd);
130 	spin_unlock_irqrestore (&ohci->lock, flags);
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_bus_resume (struct usb_hcd *hcd)
144 {
145 	struct ohci_hcd		*ohci = hcd_to_ohci (hcd);
146 	u32			temp, enables;
147 	int			status = -EINPROGRESS;
148 	unsigned long		flags;
149 
150 	if (time_before (jiffies, ohci->next_statechange))
151 		msleep(5);
152 
153 	spin_lock_irqsave (&ohci->lock, flags);
154 
155 	if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))) {
156 		spin_unlock_irqrestore (&ohci->lock, flags);
157 		return -ESHUTDOWN;
158 	}
159 
160 
161 	ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
162 
163 	if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) {
164 		/* this can happen after resuming a swsusp snapshot */
165 		if (hcd->state == HC_STATE_RESUMING) {
166 			ohci_dbg (ohci, "BIOS/SMM active, control %03x\n",
167 					ohci->hc_control);
168 			status = -EBUSY;
169 		/* this happens when pmcore resumes HC then root */
170 		} else {
171 			ohci_dbg (ohci, "duplicate resume\n");
172 			status = 0;
173 		}
174 	} else switch (ohci->hc_control & OHCI_CTRL_HCFS) {
175 	case OHCI_USB_SUSPEND:
176 		ohci->hc_control &= ~(OHCI_CTRL_HCFS|OHCI_SCHED_ENABLES);
177 		ohci->hc_control |= OHCI_USB_RESUME;
178 		ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
179 		(void) ohci_readl (ohci, &ohci->regs->control);
180 		ohci_dbg (ohci, "resume root hub\n");
181 		break;
182 	case OHCI_USB_RESUME:
183 		/* HCFS changes sometime after INTR_RD */
184 		ohci_info (ohci, "wakeup\n");
185 		break;
186 	case OHCI_USB_OPER:
187 		/* this can happen after resuming a swsusp snapshot */
188 		ohci_dbg (ohci, "snapshot resume? reinit\n");
189 		status = -EBUSY;
190 		break;
191 	default:		/* RESET, we lost power */
192 		ohci_dbg (ohci, "lost power\n");
193 		status = -EBUSY;
194 	}
195 	spin_unlock_irqrestore (&ohci->lock, flags);
196 	if (status == -EBUSY) {
197 		(void) ohci_init (ohci);
198 		return ohci_restart (ohci);
199 	}
200 	if (status != -EINPROGRESS)
201 		return status;
202 
203 	temp = ohci->num_ports;
204 	enables = 0;
205 	while (temp--) {
206 		u32 stat = ohci_readl (ohci,
207 				       &ohci->regs->roothub.portstatus [temp]);
208 
209 		/* force global, not selective, resume */
210 		if (!(stat & RH_PS_PSS))
211 			continue;
212 		ohci_writel (ohci, RH_PS_POCI,
213 				&ohci->regs->roothub.portstatus [temp]);
214 	}
215 
216 	/* Some controllers (lucent erratum) need extra-long delays */
217 	msleep (20 /* usb 11.5.1.10 */ + 12 /* 32 msec counter */ + 1);
218 
219 	temp = ohci_readl (ohci, &ohci->regs->control);
220 	temp &= OHCI_CTRL_HCFS;
221 	if (temp != OHCI_USB_RESUME) {
222 		ohci_err (ohci, "controller won't resume\n");
223 		return -EBUSY;
224 	}
225 
226 	/* disable old schedule state, reinit from scratch */
227 	ohci_writel (ohci, 0, &ohci->regs->ed_controlhead);
228 	ohci_writel (ohci, 0, &ohci->regs->ed_controlcurrent);
229 	ohci_writel (ohci, 0, &ohci->regs->ed_bulkhead);
230 	ohci_writel (ohci, 0, &ohci->regs->ed_bulkcurrent);
231 	ohci_writel (ohci, 0, &ohci->regs->ed_periodcurrent);
232 	ohci_writel (ohci, (u32) ohci->hcca_dma, &ohci->regs->hcca);
233 
234 	/* Sometimes PCI D3 suspend trashes frame timings ... */
235 	periodic_reinit (ohci);
236 
237 	/* interrupts might have been disabled */
238 	ohci_writel (ohci, OHCI_INTR_INIT, &ohci->regs->intrenable);
239 	if (ohci->ed_rm_list)
240 		ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrenable);
241 	ohci_writel (ohci, ohci_readl (ohci, &ohci->regs->intrstatus),
242 			&ohci->regs->intrstatus);
243 
244 	/* Then re-enable operations */
245 	ohci_writel (ohci, OHCI_USB_OPER, &ohci->regs->control);
246 	(void) ohci_readl (ohci, &ohci->regs->control);
247 	msleep (3);
248 
249 	temp = ohci->hc_control;
250 	temp &= OHCI_CTRL_RWC;
251 	temp |= OHCI_CONTROL_INIT | OHCI_USB_OPER;
252 	ohci->hc_control = temp;
253 	ohci_writel (ohci, temp, &ohci->regs->control);
254 	(void) ohci_readl (ohci, &ohci->regs->control);
255 
256 	/* TRSMRCY */
257 	msleep (10);
258 
259 	/* keep it alive for ~5x suspend + resume costs */
260 	ohci->next_statechange = jiffies + msecs_to_jiffies (250);
261 
262 	/* maybe turn schedules back on */
263 	enables = 0;
264 	temp = 0;
265 	if (!ohci->ed_rm_list) {
266 		if (ohci->ed_controltail) {
267 			ohci_writel (ohci,
268 					find_head (ohci->ed_controltail)->dma,
269 					&ohci->regs->ed_controlhead);
270 			enables |= OHCI_CTRL_CLE;
271 			temp |= OHCI_CLF;
272 		}
273 		if (ohci->ed_bulktail) {
274 			ohci_writel (ohci, find_head (ohci->ed_bulktail)->dma,
275 				&ohci->regs->ed_bulkhead);
276 			enables |= OHCI_CTRL_BLE;
277 			temp |= OHCI_BLF;
278 		}
279 	}
280 	if (hcd->self.bandwidth_isoc_reqs || hcd->self.bandwidth_int_reqs)
281 		enables |= OHCI_CTRL_PLE|OHCI_CTRL_IE;
282 	if (enables) {
283 		ohci_dbg (ohci, "restarting schedules ... %08x\n", enables);
284 		ohci->hc_control |= enables;
285 		ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
286 		if (temp)
287 			ohci_writel (ohci, temp, &ohci->regs->cmdstatus);
288 		(void) ohci_readl (ohci, &ohci->regs->control);
289 	}
290 
291 	return 0;
292 }
293 
294 #endif	/* CONFIG_PM */
295 
296 /*-------------------------------------------------------------------------*/
297 
298 /* build "status change" packet (one or two bytes) from HC registers */
299 
300 static int
301 ohci_hub_status_data (struct usb_hcd *hcd, char *buf)
302 {
303 	struct ohci_hcd	*ohci = hcd_to_ohci (hcd);
304 	int		i, changed = 0, length = 1;
305 	int		can_suspend = device_may_wakeup(&hcd->self.root_hub->dev);
306 	unsigned long	flags;
307 
308 	spin_lock_irqsave (&ohci->lock, flags);
309 
310 	/* handle autosuspended root:  finish resuming before
311 	 * letting khubd or root hub timer see state changes.
312 	 */
313 	if (unlikely((ohci->hc_control & OHCI_CTRL_HCFS) != OHCI_USB_OPER
314 		     || !HC_IS_RUNNING(hcd->state))) {
315 		can_suspend = 0;
316 		goto done;
317 	}
318 
319 	/* undocumented erratum seen on at least rev D */
320 	if ((ohci->flags & OHCI_QUIRK_AMD756)
321 			&& (roothub_a (ohci) & RH_A_NDP) > MAX_ROOT_PORTS) {
322 		ohci_warn (ohci, "bogus NDP, rereads as NDP=%d\n",
323 			  ohci_readl (ohci, &ohci->regs->roothub.a) & RH_A_NDP);
324 		/* retry later; "should not happen" */
325 		goto done;
326 	}
327 
328 	/* init status */
329 	if (roothub_status (ohci) & (RH_HS_LPSC | RH_HS_OCIC))
330 		buf [0] = changed = 1;
331 	else
332 		buf [0] = 0;
333 	if (ohci->num_ports > 7) {
334 		buf [1] = 0;
335 		length++;
336 	}
337 
338 	/* look at each port */
339 	for (i = 0; i < ohci->num_ports; i++) {
340 		u32	status = roothub_portstatus (ohci, i);
341 
342 		if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC
343 				| RH_PS_OCIC | RH_PS_PRSC)) {
344 			changed = 1;
345 			if (i < 7)
346 			    buf [0] |= 1 << (i + 1);
347 			else
348 			    buf [1] |= 1 << (i - 7);
349 			continue;
350 		}
351 
352 		/* can suspend if no ports are enabled; or if all all
353 		 * enabled ports are suspended AND remote wakeup is on.
354 		 */
355 		if (!(status & RH_PS_CCS))
356 			continue;
357 		if ((status & RH_PS_PSS) && can_suspend)
358 			continue;
359 		can_suspend = 0;
360 	}
361 done:
362 	spin_unlock_irqrestore (&ohci->lock, flags);
363 
364 #ifdef CONFIG_PM
365 	/* save power by suspending idle root hubs;
366 	 * INTR_RD wakes us when there's work
367 	 */
368 	if (can_suspend
369 			&& !changed
370 			&& !ohci->ed_rm_list
371 			&& ((OHCI_CTRL_HCFS | OHCI_SCHED_ENABLES)
372 					& ohci->hc_control)
373 				== OHCI_USB_OPER
374 			&& time_after (jiffies, ohci->next_statechange)
375 			&& usb_trylock_device (hcd->self.root_hub) == 0
376 			) {
377 		ohci_vdbg (ohci, "autosuspend\n");
378 		(void) ohci_bus_suspend (hcd);
379 		usb_unlock_device (hcd->self.root_hub);
380 	}
381 #endif
382 
383 	return changed ? length : 0;
384 }
385 
386 /*-------------------------------------------------------------------------*/
387 
388 static void
389 ohci_hub_descriptor (
390 	struct ohci_hcd			*ohci,
391 	struct usb_hub_descriptor	*desc
392 ) {
393 	u32		rh = roothub_a (ohci);
394 	u16		temp;
395 
396 	desc->bDescriptorType = 0x29;
397 	desc->bPwrOn2PwrGood = (rh & RH_A_POTPGT) >> 24;
398 	desc->bHubContrCurrent = 0;
399 
400 	desc->bNbrPorts = ohci->num_ports;
401 	temp = 1 + (ohci->num_ports / 8);
402 	desc->bDescLength = 7 + 2 * temp;
403 
404 	temp = 0;
405 	if (rh & RH_A_NPS)		/* no power switching? */
406 	    temp |= 0x0002;
407 	if (rh & RH_A_PSM) 		/* per-port power switching? */
408 	    temp |= 0x0001;
409 	if (rh & RH_A_NOCP)		/* no overcurrent reporting? */
410 	    temp |= 0x0010;
411 	else if (rh & RH_A_OCPM)	/* per-port overcurrent reporting? */
412 	    temp |= 0x0008;
413 	desc->wHubCharacteristics = (__force __u16)cpu_to_hc16(ohci, temp);
414 
415 	/* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
416 	rh = roothub_b (ohci);
417 	memset(desc->bitmap, 0xff, sizeof(desc->bitmap));
418 	desc->bitmap [0] = rh & RH_B_DR;
419 	if (ohci->num_ports > 7) {
420 		desc->bitmap [1] = (rh & RH_B_DR) >> 8;
421 		desc->bitmap [2] = 0xff;
422 	} else
423 		desc->bitmap [1] = 0xff;
424 }
425 
426 /*-------------------------------------------------------------------------*/
427 
428 #ifdef	CONFIG_USB_OTG
429 
430 static int ohci_start_port_reset (struct usb_hcd *hcd, unsigned port)
431 {
432 	struct ohci_hcd	*ohci = hcd_to_ohci (hcd);
433 	u32			status;
434 
435 	if (!port)
436 		return -EINVAL;
437 	port--;
438 
439 	/* start port reset before HNP protocol times out */
440 	status = ohci_readl(ohci, &ohci->regs->roothub.portstatus [port]);
441 	if (!(status & RH_PS_CCS))
442 		return -ENODEV;
443 
444 	/* khubd will finish the reset later */
445 	ohci_writel(ohci, RH_PS_PRS, &ohci->regs->roothub.portstatus [port]);
446 	return 0;
447 }
448 
449 static void start_hnp(struct ohci_hcd *ohci);
450 
451 #else
452 
453 #define	ohci_start_port_reset		NULL
454 
455 #endif
456 
457 /*-------------------------------------------------------------------------*/
458 
459 
460 /* See usb 7.1.7.5:  root hubs must issue at least 50 msec reset signaling,
461  * not necessarily continuous ... to guard against resume signaling.
462  * The short timeout is safe for non-root hubs, and is backward-compatible
463  * with earlier Linux hosts.
464  */
465 #ifdef	CONFIG_USB_SUSPEND
466 #define	PORT_RESET_MSEC		50
467 #else
468 #define	PORT_RESET_MSEC		10
469 #endif
470 
471 /* this timer value might be vendor-specific ... */
472 #define	PORT_RESET_HW_MSEC	10
473 
474 /* wrap-aware logic morphed from <linux/jiffies.h> */
475 #define tick_before(t1,t2) ((s16)(((s16)(t1))-((s16)(t2))) < 0)
476 
477 /* called from some task, normally khubd */
478 static inline void root_port_reset (struct ohci_hcd *ohci, unsigned port)
479 {
480 	__hc32 __iomem *portstat = &ohci->regs->roothub.portstatus [port];
481 	u32	temp;
482 	u16	now = ohci_readl(ohci, &ohci->regs->fmnumber);
483 	u16	reset_done = now + PORT_RESET_MSEC;
484 
485 	/* build a "continuous enough" reset signal, with up to
486 	 * 3msec gap between pulses.  scheduler HZ==100 must work;
487 	 * this might need to be deadline-scheduled.
488 	 */
489 	do {
490 		/* spin until any current reset finishes */
491 		for (;;) {
492 			temp = ohci_readl (ohci, portstat);
493 			if (!(temp & RH_PS_PRS))
494 				break;
495 			udelay (500);
496 		}
497 
498 		if (!(temp & RH_PS_CCS))
499 			break;
500 		if (temp & RH_PS_PRSC)
501 			ohci_writel (ohci, RH_PS_PRSC, portstat);
502 
503 		/* start the next reset, sleep till it's probably done */
504 		ohci_writel (ohci, RH_PS_PRS, portstat);
505 		msleep(PORT_RESET_HW_MSEC);
506 		now = ohci_readl(ohci, &ohci->regs->fmnumber);
507 	} while (tick_before(now, reset_done));
508 	/* caller synchronizes using PRSC */
509 }
510 
511 static int ohci_hub_control (
512 	struct usb_hcd	*hcd,
513 	u16		typeReq,
514 	u16		wValue,
515 	u16		wIndex,
516 	char		*buf,
517 	u16		wLength
518 ) {
519 	struct ohci_hcd	*ohci = hcd_to_ohci (hcd);
520 	int		ports = hcd_to_bus (hcd)->root_hub->maxchild;
521 	u32		temp;
522 	int		retval = 0;
523 
524 	if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
525 		return -ESHUTDOWN;
526 
527 	switch (typeReq) {
528 	case ClearHubFeature:
529 		switch (wValue) {
530 		case C_HUB_OVER_CURRENT:
531 			ohci_writel (ohci, RH_HS_OCIC,
532 					&ohci->regs->roothub.status);
533 		case C_HUB_LOCAL_POWER:
534 			break;
535 		default:
536 			goto error;
537 		}
538 		break;
539 	case ClearPortFeature:
540 		if (!wIndex || wIndex > ports)
541 			goto error;
542 		wIndex--;
543 
544 		switch (wValue) {
545 		case USB_PORT_FEAT_ENABLE:
546 			temp = RH_PS_CCS;
547 			break;
548 		case USB_PORT_FEAT_C_ENABLE:
549 			temp = RH_PS_PESC;
550 			break;
551 		case USB_PORT_FEAT_SUSPEND:
552 			temp = RH_PS_POCI;
553 			if ((ohci->hc_control & OHCI_CTRL_HCFS)
554 					!= OHCI_USB_OPER)
555 				usb_hcd_resume_root_hub(hcd);
556 			break;
557 		case USB_PORT_FEAT_C_SUSPEND:
558 			temp = RH_PS_PSSC;
559 			break;
560 		case USB_PORT_FEAT_POWER:
561 			temp = RH_PS_LSDA;
562 			break;
563 		case USB_PORT_FEAT_C_CONNECTION:
564 			temp = RH_PS_CSC;
565 			break;
566 		case USB_PORT_FEAT_C_OVER_CURRENT:
567 			temp = RH_PS_OCIC;
568 			break;
569 		case USB_PORT_FEAT_C_RESET:
570 			temp = RH_PS_PRSC;
571 			break;
572 		default:
573 			goto error;
574 		}
575 		ohci_writel (ohci, temp,
576 				&ohci->regs->roothub.portstatus [wIndex]);
577 		// ohci_readl (ohci, &ohci->regs->roothub.portstatus [wIndex]);
578 		break;
579 	case GetHubDescriptor:
580 		ohci_hub_descriptor (ohci, (struct usb_hub_descriptor *) buf);
581 		break;
582 	case GetHubStatus:
583 		temp = roothub_status (ohci) & ~(RH_HS_CRWE | RH_HS_DRWE);
584 		put_unaligned(cpu_to_le32 (temp), (__le32 *) buf);
585 		break;
586 	case GetPortStatus:
587 		if (!wIndex || wIndex > ports)
588 			goto error;
589 		wIndex--;
590 		temp = roothub_portstatus (ohci, wIndex);
591 		put_unaligned(cpu_to_le32 (temp), (__le32 *) buf);
592 
593 #ifndef	OHCI_VERBOSE_DEBUG
594 	if (*(u16*)(buf+2))	/* only if wPortChange is interesting */
595 #endif
596 		dbg_port (ohci, "GetStatus", wIndex, temp);
597 		break;
598 	case SetHubFeature:
599 		switch (wValue) {
600 		case C_HUB_OVER_CURRENT:
601 			// FIXME:  this can be cleared, yes?
602 		case C_HUB_LOCAL_POWER:
603 			break;
604 		default:
605 			goto error;
606 		}
607 		break;
608 	case SetPortFeature:
609 		if (!wIndex || wIndex > ports)
610 			goto error;
611 		wIndex--;
612 		switch (wValue) {
613 		case USB_PORT_FEAT_SUSPEND:
614 #ifdef	CONFIG_USB_OTG
615 			if (hcd->self.otg_port == (wIndex + 1)
616 					&& hcd->self.b_hnp_enable)
617 				start_hnp(ohci);
618 			else
619 #endif
620 			ohci_writel (ohci, RH_PS_PSS,
621 				&ohci->regs->roothub.portstatus [wIndex]);
622 			break;
623 		case USB_PORT_FEAT_POWER:
624 			ohci_writel (ohci, RH_PS_PPS,
625 				&ohci->regs->roothub.portstatus [wIndex]);
626 			break;
627 		case USB_PORT_FEAT_RESET:
628 			root_port_reset (ohci, wIndex);
629 			break;
630 		default:
631 			goto error;
632 		}
633 		break;
634 
635 	default:
636 error:
637 		/* "protocol stall" on error */
638 		retval = -EPIPE;
639 	}
640 	return retval;
641 }
642 
643