xref: /openbmc/linux/drivers/usb/host/ehci-hub.c (revision 92a76f6d)
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 #include <linux/usb/otg.h>
31 
32 #define	PORT_WAKE_BITS	(PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
33 
34 #ifdef	CONFIG_PM
35 
36 static void unlink_empty_async_suspended(struct ehci_hcd *ehci);
37 
38 static int persist_enabled_on_companion(struct usb_device *udev, void *unused)
39 {
40 	return !udev->maxchild && udev->persist_enabled &&
41 		udev->bus->root_hub->speed < USB_SPEED_HIGH;
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 	/*
59 	 * USB 1.1 devices are mostly HIDs, which don't need to persist across
60 	 * suspends. If we ensure that none of our companion's devices have
61 	 * persist_enabled (by looking through all USB 1.1 buses in the system),
62 	 * we can skip this and avoid slowing resume down. Devices without
63 	 * persist will just get reenumerated shortly after resume anyway.
64 	 */
65 	if (!usb_for_each_dev(NULL, persist_enabled_on_companion))
66 		return;
67 
68 	/* Make sure the ports are powered */
69 	port = HCS_N_PORTS(ehci->hcs_params);
70 	while (port--) {
71 		if (test_bit(port, &ehci->owned_ports)) {
72 			reg = &ehci->regs->port_status[port];
73 			status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
74 			if (!(status & PORT_POWER))
75 				ehci_port_power(ehci, port, true);
76 		}
77 	}
78 
79 	/* Give the connections some time to appear */
80 	msleep(20);
81 
82 	spin_lock_irq(&ehci->lock);
83 	port = HCS_N_PORTS(ehci->hcs_params);
84 	while (port--) {
85 		if (test_bit(port, &ehci->owned_ports)) {
86 			reg = &ehci->regs->port_status[port];
87 			status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
88 
89 			/* Port already owned by companion? */
90 			if (status & PORT_OWNER)
91 				clear_bit(port, &ehci->owned_ports);
92 			else if (test_bit(port, &ehci->companion_ports))
93 				ehci_writel(ehci, status & ~PORT_PE, reg);
94 			else {
95 				spin_unlock_irq(&ehci->lock);
96 				ehci_hub_control(hcd, SetPortFeature,
97 						USB_PORT_FEAT_RESET, port + 1,
98 						NULL, 0);
99 				spin_lock_irq(&ehci->lock);
100 			}
101 		}
102 	}
103 	spin_unlock_irq(&ehci->lock);
104 
105 	if (!ehci->owned_ports)
106 		return;
107 	msleep(90);		/* Wait for resets to complete */
108 
109 	spin_lock_irq(&ehci->lock);
110 	port = HCS_N_PORTS(ehci->hcs_params);
111 	while (port--) {
112 		if (test_bit(port, &ehci->owned_ports)) {
113 			spin_unlock_irq(&ehci->lock);
114 			ehci_hub_control(hcd, GetPortStatus,
115 					0, port + 1,
116 					(char *) &buf, sizeof(buf));
117 			spin_lock_irq(&ehci->lock);
118 
119 			/* The companion should now own the port,
120 			 * but if something went wrong the port must not
121 			 * remain enabled.
122 			 */
123 			reg = &ehci->regs->port_status[port];
124 			status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
125 			if (status & PORT_OWNER)
126 				ehci_writel(ehci, status | PORT_CSC, reg);
127 			else {
128 				ehci_dbg(ehci, "failed handover port %d: %x\n",
129 						port + 1, status);
130 				ehci_writel(ehci, status & ~PORT_PE, reg);
131 			}
132 		}
133 	}
134 
135 	ehci->owned_ports = 0;
136 	spin_unlock_irq(&ehci->lock);
137 }
138 
139 static int ehci_port_change(struct ehci_hcd *ehci)
140 {
141 	int i = HCS_N_PORTS(ehci->hcs_params);
142 
143 	/* First check if the controller indicates a change event */
144 
145 	if (ehci_readl(ehci, &ehci->regs->status) & STS_PCD)
146 		return 1;
147 
148 	/*
149 	 * Not all controllers appear to update this while going from D3 to D0,
150 	 * so check the individual port status registers as well
151 	 */
152 
153 	while (i--)
154 		if (ehci_readl(ehci, &ehci->regs->port_status[i]) & PORT_CSC)
155 			return 1;
156 
157 	return 0;
158 }
159 
160 void ehci_adjust_port_wakeup_flags(struct ehci_hcd *ehci,
161 		bool suspending, bool do_wakeup)
162 {
163 	int		port;
164 	u32		temp;
165 
166 	/* If remote wakeup is enabled for the root hub but disabled
167 	 * for the controller, we must adjust all the port wakeup flags
168 	 * when the controller is suspended or resumed.  In all other
169 	 * cases they don't need to be changed.
170 	 */
171 	if (!ehci_to_hcd(ehci)->self.root_hub->do_remote_wakeup || do_wakeup)
172 		return;
173 
174 	spin_lock_irq(&ehci->lock);
175 
176 	/* clear phy low-power mode before changing wakeup flags */
177 	if (ehci->has_tdi_phy_lpm) {
178 		port = HCS_N_PORTS(ehci->hcs_params);
179 		while (port--) {
180 			u32 __iomem	*hostpc_reg = &ehci->regs->hostpc[port];
181 
182 			temp = ehci_readl(ehci, hostpc_reg);
183 			ehci_writel(ehci, temp & ~HOSTPC_PHCD, hostpc_reg);
184 		}
185 		spin_unlock_irq(&ehci->lock);
186 		msleep(5);
187 		spin_lock_irq(&ehci->lock);
188 	}
189 
190 	port = HCS_N_PORTS(ehci->hcs_params);
191 	while (port--) {
192 		u32 __iomem	*reg = &ehci->regs->port_status[port];
193 		u32		t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
194 		u32		t2 = t1 & ~PORT_WAKE_BITS;
195 
196 		/* If we are suspending the controller, clear the flags.
197 		 * If we are resuming the controller, set the wakeup flags.
198 		 */
199 		if (!suspending) {
200 			if (t1 & PORT_CONNECT)
201 				t2 |= PORT_WKOC_E | PORT_WKDISC_E;
202 			else
203 				t2 |= PORT_WKOC_E | PORT_WKCONN_E;
204 		}
205 		ehci_writel(ehci, t2, reg);
206 	}
207 
208 	/* enter phy low-power mode again */
209 	if (ehci->has_tdi_phy_lpm) {
210 		port = HCS_N_PORTS(ehci->hcs_params);
211 		while (port--) {
212 			u32 __iomem	*hostpc_reg = &ehci->regs->hostpc[port];
213 
214 			temp = ehci_readl(ehci, hostpc_reg);
215 			ehci_writel(ehci, temp | HOSTPC_PHCD, hostpc_reg);
216 		}
217 	}
218 
219 	/* Does the root hub have a port wakeup pending? */
220 	if (!suspending && ehci_port_change(ehci))
221 		usb_hcd_resume_root_hub(ehci_to_hcd(ehci));
222 
223 	spin_unlock_irq(&ehci->lock);
224 }
225 EXPORT_SYMBOL_GPL(ehci_adjust_port_wakeup_flags);
226 
227 static int ehci_bus_suspend (struct usb_hcd *hcd)
228 {
229 	struct ehci_hcd		*ehci = hcd_to_ehci (hcd);
230 	int			port;
231 	int			mask;
232 	int			changed;
233 	bool			fs_idle_delay;
234 
235 	ehci_dbg(ehci, "suspend root hub\n");
236 
237 	if (time_before (jiffies, ehci->next_statechange))
238 		msleep(5);
239 
240 	/* stop the schedules */
241 	ehci_quiesce(ehci);
242 
243 	spin_lock_irq (&ehci->lock);
244 	if (ehci->rh_state < EHCI_RH_RUNNING)
245 		goto done;
246 
247 	/* Once the controller is stopped, port resumes that are already
248 	 * in progress won't complete.  Hence if remote wakeup is enabled
249 	 * for the root hub and any ports are in the middle of a resume or
250 	 * remote wakeup, we must fail the suspend.
251 	 */
252 	if (hcd->self.root_hub->do_remote_wakeup) {
253 		if (ehci->resuming_ports) {
254 			spin_unlock_irq(&ehci->lock);
255 			ehci_dbg(ehci, "suspend failed because a port is resuming\n");
256 			return -EBUSY;
257 		}
258 	}
259 
260 	/* Unlike other USB host controller types, EHCI doesn't have
261 	 * any notion of "global" or bus-wide suspend.  The driver has
262 	 * to manually suspend all the active unsuspended ports, and
263 	 * then manually resume them in the bus_resume() routine.
264 	 */
265 	ehci->bus_suspended = 0;
266 	ehci->owned_ports = 0;
267 	changed = 0;
268 	fs_idle_delay = false;
269 	port = HCS_N_PORTS(ehci->hcs_params);
270 	while (port--) {
271 		u32 __iomem	*reg = &ehci->regs->port_status [port];
272 		u32		t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
273 		u32		t2 = t1 & ~PORT_WAKE_BITS;
274 
275 		/* keep track of which ports we suspend */
276 		if (t1 & PORT_OWNER)
277 			set_bit(port, &ehci->owned_ports);
278 		else if ((t1 & PORT_PE) && !(t1 & PORT_SUSPEND)) {
279 			t2 |= PORT_SUSPEND;
280 			set_bit(port, &ehci->bus_suspended);
281 		}
282 
283 		/* enable remote wakeup on all ports, if told to do so */
284 		if (hcd->self.root_hub->do_remote_wakeup) {
285 			/* only enable appropriate wake bits, otherwise the
286 			 * hardware can not go phy low power mode. If a race
287 			 * condition happens here(connection change during bits
288 			 * set), the port change detection will finally fix it.
289 			 */
290 			if (t1 & PORT_CONNECT)
291 				t2 |= PORT_WKOC_E | PORT_WKDISC_E;
292 			else
293 				t2 |= PORT_WKOC_E | PORT_WKCONN_E;
294 		}
295 
296 		if (t1 != t2) {
297 			/*
298 			 * On some controllers, Wake-On-Disconnect will
299 			 * generate false wakeup signals until the bus
300 			 * switches over to full-speed idle.  For their
301 			 * sake, add a delay if we need one.
302 			 */
303 			if ((t2 & PORT_WKDISC_E) &&
304 					ehci_port_speed(ehci, t2) ==
305 						USB_PORT_STAT_HIGH_SPEED)
306 				fs_idle_delay = true;
307 			ehci_writel(ehci, t2, reg);
308 			changed = 1;
309 		}
310 	}
311 	spin_unlock_irq(&ehci->lock);
312 
313 	if ((changed && ehci->has_tdi_phy_lpm) || fs_idle_delay) {
314 		/*
315 		 * Wait for HCD to enter low-power mode or for the bus
316 		 * to switch to full-speed idle.
317 		 */
318 		usleep_range(5000, 5500);
319 	}
320 
321 	if (changed && ehci->has_tdi_phy_lpm) {
322 		spin_lock_irq(&ehci->lock);
323 		port = HCS_N_PORTS(ehci->hcs_params);
324 		while (port--) {
325 			u32 __iomem	*hostpc_reg = &ehci->regs->hostpc[port];
326 			u32		t3;
327 
328 			t3 = ehci_readl(ehci, hostpc_reg);
329 			ehci_writel(ehci, t3 | HOSTPC_PHCD, hostpc_reg);
330 			t3 = ehci_readl(ehci, hostpc_reg);
331 			ehci_dbg(ehci, "Port %d phy low-power mode %s\n",
332 					port, (t3 & HOSTPC_PHCD) ?
333 					"succeeded" : "failed");
334 		}
335 		spin_unlock_irq(&ehci->lock);
336 	}
337 
338 	/* Apparently some devices need a >= 1-uframe delay here */
339 	if (ehci->bus_suspended)
340 		udelay(150);
341 
342 	/* turn off now-idle HC */
343 	ehci_halt (ehci);
344 
345 	spin_lock_irq(&ehci->lock);
346 	if (ehci->enabled_hrtimer_events & BIT(EHCI_HRTIMER_POLL_DEAD))
347 		ehci_handle_controller_death(ehci);
348 	if (ehci->rh_state != EHCI_RH_RUNNING)
349 		goto done;
350 	ehci->rh_state = EHCI_RH_SUSPENDED;
351 
352 	unlink_empty_async_suspended(ehci);
353 
354 	/* Any IAA cycle that started before the suspend is now invalid */
355 	end_iaa_cycle(ehci);
356 	ehci_handle_start_intr_unlinks(ehci);
357 	ehci_handle_intr_unlinks(ehci);
358 	end_free_itds(ehci);
359 
360 	/* allow remote wakeup */
361 	mask = INTR_MASK;
362 	if (!hcd->self.root_hub->do_remote_wakeup)
363 		mask &= ~STS_PCD;
364 	ehci_writel(ehci, mask, &ehci->regs->intr_enable);
365 	ehci_readl(ehci, &ehci->regs->intr_enable);
366 
367  done:
368 	ehci->next_statechange = jiffies + msecs_to_jiffies(10);
369 	ehci->enabled_hrtimer_events = 0;
370 	ehci->next_hrtimer_event = EHCI_HRTIMER_NO_EVENT;
371 	spin_unlock_irq (&ehci->lock);
372 
373 	hrtimer_cancel(&ehci->hrtimer);
374 	return 0;
375 }
376 
377 
378 /* caller has locked the root hub, and should reset/reinit on error */
379 static int ehci_bus_resume (struct usb_hcd *hcd)
380 {
381 	struct ehci_hcd		*ehci = hcd_to_ehci (hcd);
382 	u32			temp;
383 	u32			power_okay;
384 	int			i;
385 	unsigned long		resume_needed = 0;
386 
387 	if (time_before (jiffies, ehci->next_statechange))
388 		msleep(5);
389 	spin_lock_irq (&ehci->lock);
390 	if (!HCD_HW_ACCESSIBLE(hcd) || ehci->shutdown)
391 		goto shutdown;
392 
393 	if (unlikely(ehci->debug)) {
394 		if (!dbgp_reset_prep(hcd))
395 			ehci->debug = NULL;
396 		else
397 			dbgp_external_startup(hcd);
398 	}
399 
400 	/* Ideally and we've got a real resume here, and no port's power
401 	 * was lost.  (For PCI, that means Vaux was maintained.)  But we
402 	 * could instead be restoring a swsusp snapshot -- so that BIOS was
403 	 * the last user of the controller, not reset/pm hardware keeping
404 	 * state we gave to it.
405 	 */
406 	power_okay = ehci_readl(ehci, &ehci->regs->intr_enable);
407 	ehci_dbg(ehci, "resume root hub%s\n",
408 			power_okay ? "" : " after power loss");
409 
410 	/* at least some APM implementations will try to deliver
411 	 * IRQs right away, so delay them until we're ready.
412 	 */
413 	ehci_writel(ehci, 0, &ehci->regs->intr_enable);
414 
415 	/* re-init operational registers */
416 	ehci_writel(ehci, 0, &ehci->regs->segment);
417 	ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
418 	ehci_writel(ehci, (u32) ehci->async->qh_dma, &ehci->regs->async_next);
419 
420 	/* restore CMD_RUN, framelist size, and irq threshold */
421 	ehci->command |= CMD_RUN;
422 	ehci_writel(ehci, ehci->command, &ehci->regs->command);
423 	ehci->rh_state = EHCI_RH_RUNNING;
424 
425 	/*
426 	 * According to Bugzilla #8190, the port status for some controllers
427 	 * will be wrong without a delay. At their wrong status, the port
428 	 * is enabled, but not suspended neither resumed.
429 	 */
430 	i = HCS_N_PORTS(ehci->hcs_params);
431 	while (i--) {
432 		temp = ehci_readl(ehci, &ehci->regs->port_status[i]);
433 		if ((temp & PORT_PE) &&
434 				!(temp & (PORT_SUSPEND | PORT_RESUME))) {
435 			ehci_dbg(ehci, "Port status(0x%x) is wrong\n", temp);
436 			spin_unlock_irq(&ehci->lock);
437 			msleep(8);
438 			spin_lock_irq(&ehci->lock);
439 			break;
440 		}
441 	}
442 
443 	if (ehci->shutdown)
444 		goto shutdown;
445 
446 	/* clear phy low-power mode before resume */
447 	if (ehci->bus_suspended && ehci->has_tdi_phy_lpm) {
448 		i = HCS_N_PORTS(ehci->hcs_params);
449 		while (i--) {
450 			if (test_bit(i, &ehci->bus_suspended)) {
451 				u32 __iomem	*hostpc_reg =
452 							&ehci->regs->hostpc[i];
453 
454 				temp = ehci_readl(ehci, hostpc_reg);
455 				ehci_writel(ehci, temp & ~HOSTPC_PHCD,
456 						hostpc_reg);
457 			}
458 		}
459 		spin_unlock_irq(&ehci->lock);
460 		msleep(5);
461 		spin_lock_irq(&ehci->lock);
462 		if (ehci->shutdown)
463 			goto shutdown;
464 	}
465 
466 	/* manually resume the ports we suspended during bus_suspend() */
467 	i = HCS_N_PORTS (ehci->hcs_params);
468 	while (i--) {
469 		temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
470 		temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
471 		if (test_bit(i, &ehci->bus_suspended) &&
472 				(temp & PORT_SUSPEND)) {
473 			temp |= PORT_RESUME;
474 			set_bit(i, &resume_needed);
475 		}
476 		ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
477 	}
478 
479 	/*
480 	 * msleep for USB_RESUME_TIMEOUT ms only if code is trying to resume
481 	 * port
482 	 */
483 	if (resume_needed) {
484 		spin_unlock_irq(&ehci->lock);
485 		msleep(USB_RESUME_TIMEOUT);
486 		spin_lock_irq(&ehci->lock);
487 		if (ehci->shutdown)
488 			goto shutdown;
489 	}
490 
491 	i = HCS_N_PORTS (ehci->hcs_params);
492 	while (i--) {
493 		temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
494 		if (test_bit(i, &resume_needed)) {
495 			temp &= ~(PORT_RWC_BITS | PORT_SUSPEND | PORT_RESUME);
496 			ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
497 		}
498 	}
499 
500 	ehci->next_statechange = jiffies + msecs_to_jiffies(5);
501 	spin_unlock_irq(&ehci->lock);
502 
503 	ehci_handover_companion_ports(ehci);
504 
505 	/* Now we can safely re-enable irqs */
506 	spin_lock_irq(&ehci->lock);
507 	if (ehci->shutdown)
508 		goto shutdown;
509 	ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
510 	(void) ehci_readl(ehci, &ehci->regs->intr_enable);
511 	spin_unlock_irq(&ehci->lock);
512 
513 	return 0;
514 
515  shutdown:
516 	spin_unlock_irq(&ehci->lock);
517 	return -ESHUTDOWN;
518 }
519 
520 #else
521 
522 #define ehci_bus_suspend	NULL
523 #define ehci_bus_resume		NULL
524 
525 #endif	/* CONFIG_PM */
526 
527 /*-------------------------------------------------------------------------*/
528 
529 /*
530  * Sets the owner of a port
531  */
532 static void set_owner(struct ehci_hcd *ehci, int portnum, int new_owner)
533 {
534 	u32 __iomem		*status_reg;
535 	u32			port_status;
536 	int 			try;
537 
538 	status_reg = &ehci->regs->port_status[portnum];
539 
540 	/*
541 	 * The controller won't set the OWNER bit if the port is
542 	 * enabled, so this loop will sometimes require at least two
543 	 * iterations: one to disable the port and one to set OWNER.
544 	 */
545 	for (try = 4; try > 0; --try) {
546 		spin_lock_irq(&ehci->lock);
547 		port_status = ehci_readl(ehci, status_reg);
548 		if ((port_status & PORT_OWNER) == new_owner
549 				|| (port_status & (PORT_OWNER | PORT_CONNECT))
550 					== 0)
551 			try = 0;
552 		else {
553 			port_status ^= PORT_OWNER;
554 			port_status &= ~(PORT_PE | PORT_RWC_BITS);
555 			ehci_writel(ehci, port_status, status_reg);
556 		}
557 		spin_unlock_irq(&ehci->lock);
558 		if (try > 1)
559 			msleep(5);
560 	}
561 }
562 
563 /*-------------------------------------------------------------------------*/
564 
565 static int check_reset_complete (
566 	struct ehci_hcd	*ehci,
567 	int		index,
568 	u32 __iomem	*status_reg,
569 	int		port_status
570 ) {
571 	if (!(port_status & PORT_CONNECT))
572 		return port_status;
573 
574 	/* if reset finished and it's still not enabled -- handoff */
575 	if (!(port_status & PORT_PE)) {
576 
577 		/* with integrated TT, there's nobody to hand it to! */
578 		if (ehci_is_TDI(ehci)) {
579 			ehci_dbg (ehci,
580 				"Failed to enable port %d on root hub TT\n",
581 				index+1);
582 			return port_status;
583 		}
584 
585 		ehci_dbg (ehci, "port %d full speed --> companion\n",
586 			index + 1);
587 
588 		// what happens if HCS_N_CC(params) == 0 ?
589 		port_status |= PORT_OWNER;
590 		port_status &= ~PORT_RWC_BITS;
591 		ehci_writel(ehci, port_status, status_reg);
592 
593 		/* ensure 440EPX ohci controller state is operational */
594 		if (ehci->has_amcc_usb23)
595 			set_ohci_hcfs(ehci, 1);
596 	} else {
597 		ehci_dbg(ehci, "port %d reset complete, port enabled\n",
598 			index + 1);
599 		/* ensure 440EPx ohci controller state is suspended */
600 		if (ehci->has_amcc_usb23)
601 			set_ohci_hcfs(ehci, 0);
602 	}
603 
604 	return port_status;
605 }
606 
607 /*-------------------------------------------------------------------------*/
608 
609 
610 /* build "status change" packet (one or two bytes) from HC registers */
611 
612 static int
613 ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
614 {
615 	struct ehci_hcd	*ehci = hcd_to_ehci (hcd);
616 	u32		temp, status;
617 	u32		mask;
618 	int		ports, i, retval = 1;
619 	unsigned long	flags;
620 	u32		ppcd = ~0;
621 
622 	/* init status to no-changes */
623 	buf [0] = 0;
624 	ports = HCS_N_PORTS (ehci->hcs_params);
625 	if (ports > 7) {
626 		buf [1] = 0;
627 		retval++;
628 	}
629 
630 	/* Inform the core about resumes-in-progress by returning
631 	 * a non-zero value even if there are no status changes.
632 	 */
633 	status = ehci->resuming_ports;
634 
635 	/* Some boards (mostly VIA?) report bogus overcurrent indications,
636 	 * causing massive log spam unless we completely ignore them.  It
637 	 * may be relevant that VIA VT8235 controllers, where PORT_POWER is
638 	 * always set, seem to clear PORT_OCC and PORT_CSC when writing to
639 	 * PORT_POWER; that's surprising, but maybe within-spec.
640 	 */
641 	if (!ignore_oc)
642 		mask = PORT_CSC | PORT_PEC | PORT_OCC;
643 	else
644 		mask = PORT_CSC | PORT_PEC;
645 	// PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
646 
647 	/* no hub change reports (bit 0) for now (power, ...) */
648 
649 	/* port N changes (bit N)? */
650 	spin_lock_irqsave (&ehci->lock, flags);
651 
652 	/* get per-port change detect bits */
653 	if (ehci->has_ppcd)
654 		ppcd = ehci_readl(ehci, &ehci->regs->status) >> 16;
655 
656 	for (i = 0; i < ports; i++) {
657 		/* leverage per-port change bits feature */
658 		if (ppcd & (1 << i))
659 			temp = ehci_readl(ehci, &ehci->regs->port_status[i]);
660 		else
661 			temp = 0;
662 
663 		/*
664 		 * Return status information even for ports with OWNER set.
665 		 * Otherwise hub_wq wouldn't see the disconnect event when a
666 		 * high-speed device is switched over to the companion
667 		 * controller by the user.
668 		 */
669 
670 		if ((temp & mask) != 0 || test_bit(i, &ehci->port_c_suspend)
671 				|| (ehci->reset_done[i] && time_after_eq(
672 					jiffies, ehci->reset_done[i]))) {
673 			if (i < 7)
674 			    buf [0] |= 1 << (i + 1);
675 			else
676 			    buf [1] |= 1 << (i - 7);
677 			status = STS_PCD;
678 		}
679 	}
680 
681 	/* If a resume is in progress, make sure it can finish */
682 	if (ehci->resuming_ports)
683 		mod_timer(&hcd->rh_timer, jiffies + msecs_to_jiffies(25));
684 
685 	spin_unlock_irqrestore (&ehci->lock, flags);
686 	return status ? retval : 0;
687 }
688 
689 /*-------------------------------------------------------------------------*/
690 
691 static void
692 ehci_hub_descriptor (
693 	struct ehci_hcd			*ehci,
694 	struct usb_hub_descriptor	*desc
695 ) {
696 	int		ports = HCS_N_PORTS (ehci->hcs_params);
697 	u16		temp;
698 
699 	desc->bDescriptorType = USB_DT_HUB;
700 	desc->bPwrOn2PwrGood = 10;	/* ehci 1.0, 2.3.9 says 20ms max */
701 	desc->bHubContrCurrent = 0;
702 
703 	desc->bNbrPorts = ports;
704 	temp = 1 + (ports / 8);
705 	desc->bDescLength = 7 + 2 * temp;
706 
707 	/* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
708 	memset(&desc->u.hs.DeviceRemovable[0], 0, temp);
709 	memset(&desc->u.hs.DeviceRemovable[temp], 0xff, temp);
710 
711 	temp = HUB_CHAR_INDV_PORT_OCPM;	/* per-port overcurrent reporting */
712 	if (HCS_PPC (ehci->hcs_params))
713 		temp |= HUB_CHAR_INDV_PORT_LPSM; /* per-port power control */
714 	else
715 		temp |= HUB_CHAR_NO_LPSM; /* no power switching */
716 #if 0
717 // re-enable when we support USB_PORT_FEAT_INDICATOR below.
718 	if (HCS_INDICATOR (ehci->hcs_params))
719 		temp |= HUB_CHAR_PORTIND; /* per-port indicators (LEDs) */
720 #endif
721 	desc->wHubCharacteristics = cpu_to_le16(temp);
722 }
723 
724 /*-------------------------------------------------------------------------*/
725 #ifdef CONFIG_USB_HCD_TEST_MODE
726 
727 #define EHSET_TEST_SINGLE_STEP_SET_FEATURE 0x06
728 
729 static void usb_ehset_completion(struct urb *urb)
730 {
731 	struct completion  *done = urb->context;
732 
733 	complete(done);
734 }
735 static int submit_single_step_set_feature(
736 	struct usb_hcd	*hcd,
737 	struct urb	*urb,
738 	int		is_setup
739 );
740 
741 /*
742  * Allocate and initialize a control URB. This request will be used by the
743  * EHSET SINGLE_STEP_SET_FEATURE test in which the DATA and STATUS stages
744  * of the GetDescriptor request are sent 15 seconds after the SETUP stage.
745  * Return NULL if failed.
746  */
747 static struct urb *request_single_step_set_feature_urb(
748 	struct usb_device	*udev,
749 	void			*dr,
750 	void			*buf,
751 	struct completion	*done
752 ) {
753 	struct urb *urb;
754 	struct usb_hcd *hcd = bus_to_hcd(udev->bus);
755 	struct usb_host_endpoint *ep;
756 
757 	urb = usb_alloc_urb(0, GFP_KERNEL);
758 	if (!urb)
759 		return NULL;
760 
761 	urb->pipe = usb_rcvctrlpipe(udev, 0);
762 	ep = (usb_pipein(urb->pipe) ? udev->ep_in : udev->ep_out)
763 				[usb_pipeendpoint(urb->pipe)];
764 	if (!ep) {
765 		usb_free_urb(urb);
766 		return NULL;
767 	}
768 
769 	urb->ep = ep;
770 	urb->dev = udev;
771 	urb->setup_packet = (void *)dr;
772 	urb->transfer_buffer = buf;
773 	urb->transfer_buffer_length = USB_DT_DEVICE_SIZE;
774 	urb->complete = usb_ehset_completion;
775 	urb->status = -EINPROGRESS;
776 	urb->actual_length = 0;
777 	urb->transfer_flags = URB_DIR_IN;
778 	usb_get_urb(urb);
779 	atomic_inc(&urb->use_count);
780 	atomic_inc(&urb->dev->urbnum);
781 	urb->setup_dma = dma_map_single(
782 			hcd->self.controller,
783 			urb->setup_packet,
784 			sizeof(struct usb_ctrlrequest),
785 			DMA_TO_DEVICE);
786 	urb->transfer_dma = dma_map_single(
787 			hcd->self.controller,
788 			urb->transfer_buffer,
789 			urb->transfer_buffer_length,
790 			DMA_FROM_DEVICE);
791 	urb->context = done;
792 	return urb;
793 }
794 
795 static int ehset_single_step_set_feature(struct usb_hcd *hcd, int port)
796 {
797 	int retval = -ENOMEM;
798 	struct usb_ctrlrequest *dr;
799 	struct urb *urb;
800 	struct usb_device *udev;
801 	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
802 	struct usb_device_descriptor *buf;
803 	DECLARE_COMPLETION_ONSTACK(done);
804 
805 	/* Obtain udev of the rhub's child port */
806 	udev = usb_hub_find_child(hcd->self.root_hub, port);
807 	if (!udev) {
808 		ehci_err(ehci, "No device attached to the RootHub\n");
809 		return -ENODEV;
810 	}
811 	buf = kmalloc(USB_DT_DEVICE_SIZE, GFP_KERNEL);
812 	if (!buf)
813 		return -ENOMEM;
814 
815 	dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
816 	if (!dr) {
817 		kfree(buf);
818 		return -ENOMEM;
819 	}
820 
821 	/* Fill Setup packet for GetDescriptor */
822 	dr->bRequestType = USB_DIR_IN;
823 	dr->bRequest = USB_REQ_GET_DESCRIPTOR;
824 	dr->wValue = cpu_to_le16(USB_DT_DEVICE << 8);
825 	dr->wIndex = 0;
826 	dr->wLength = cpu_to_le16(USB_DT_DEVICE_SIZE);
827 	urb = request_single_step_set_feature_urb(udev, dr, buf, &done);
828 	if (!urb)
829 		goto cleanup;
830 
831 	/* Submit just the SETUP stage */
832 	retval = submit_single_step_set_feature(hcd, urb, 1);
833 	if (retval)
834 		goto out1;
835 	if (!wait_for_completion_timeout(&done, msecs_to_jiffies(2000))) {
836 		usb_kill_urb(urb);
837 		retval = -ETIMEDOUT;
838 		ehci_err(ehci, "%s SETUP stage timed out on ep0\n", __func__);
839 		goto out1;
840 	}
841 	msleep(15 * 1000);
842 
843 	/* Complete remaining DATA and STATUS stages using the same URB */
844 	urb->status = -EINPROGRESS;
845 	usb_get_urb(urb);
846 	atomic_inc(&urb->use_count);
847 	atomic_inc(&urb->dev->urbnum);
848 	retval = submit_single_step_set_feature(hcd, urb, 0);
849 	if (!retval && !wait_for_completion_timeout(&done,
850 						msecs_to_jiffies(2000))) {
851 		usb_kill_urb(urb);
852 		retval = -ETIMEDOUT;
853 		ehci_err(ehci, "%s IN stage timed out on ep0\n", __func__);
854 	}
855 out1:
856 	usb_free_urb(urb);
857 cleanup:
858 	kfree(dr);
859 	kfree(buf);
860 	return retval;
861 }
862 #endif /* CONFIG_USB_HCD_TEST_MODE */
863 /*-------------------------------------------------------------------------*/
864 
865 int ehci_hub_control(
866 	struct usb_hcd	*hcd,
867 	u16		typeReq,
868 	u16		wValue,
869 	u16		wIndex,
870 	char		*buf,
871 	u16		wLength
872 ) {
873 	struct ehci_hcd	*ehci = hcd_to_ehci (hcd);
874 	int		ports = HCS_N_PORTS (ehci->hcs_params);
875 	u32 __iomem	*status_reg = &ehci->regs->port_status[
876 				(wIndex & 0xff) - 1];
877 	u32 __iomem	*hostpc_reg = &ehci->regs->hostpc[(wIndex & 0xff) - 1];
878 	u32		temp, temp1, status;
879 	unsigned long	flags;
880 	int		retval = 0;
881 	unsigned	selector;
882 
883 	/*
884 	 * FIXME:  support SetPortFeatures USB_PORT_FEAT_INDICATOR.
885 	 * HCS_INDICATOR may say we can change LEDs to off/amber/green.
886 	 * (track current state ourselves) ... blink for diagnostics,
887 	 * power, "this is the one", etc.  EHCI spec supports this.
888 	 */
889 
890 	spin_lock_irqsave (&ehci->lock, flags);
891 	switch (typeReq) {
892 	case ClearHubFeature:
893 		switch (wValue) {
894 		case C_HUB_LOCAL_POWER:
895 		case C_HUB_OVER_CURRENT:
896 			/* no hub-wide feature/status flags */
897 			break;
898 		default:
899 			goto error;
900 		}
901 		break;
902 	case ClearPortFeature:
903 		if (!wIndex || wIndex > ports)
904 			goto error;
905 		wIndex--;
906 		temp = ehci_readl(ehci, status_reg);
907 		temp &= ~PORT_RWC_BITS;
908 
909 		/*
910 		 * Even if OWNER is set, so the port is owned by the
911 		 * companion controller, hub_wq needs to be able to clear
912 		 * the port-change status bits (especially
913 		 * USB_PORT_STAT_C_CONNECTION).
914 		 */
915 
916 		switch (wValue) {
917 		case USB_PORT_FEAT_ENABLE:
918 			ehci_writel(ehci, temp & ~PORT_PE, status_reg);
919 			break;
920 		case USB_PORT_FEAT_C_ENABLE:
921 			ehci_writel(ehci, temp | PORT_PEC, status_reg);
922 			break;
923 		case USB_PORT_FEAT_SUSPEND:
924 			if (temp & PORT_RESET)
925 				goto error;
926 			if (ehci->no_selective_suspend)
927 				break;
928 #ifdef CONFIG_USB_OTG
929 			if ((hcd->self.otg_port == (wIndex + 1))
930 			    && hcd->self.b_hnp_enable) {
931 				otg_start_hnp(hcd->usb_phy->otg);
932 				break;
933 			}
934 #endif
935 			if (!(temp & PORT_SUSPEND))
936 				break;
937 			if ((temp & PORT_PE) == 0)
938 				goto error;
939 
940 			/* clear phy low-power mode before resume */
941 			if (ehci->has_tdi_phy_lpm) {
942 				temp1 = ehci_readl(ehci, hostpc_reg);
943 				ehci_writel(ehci, temp1 & ~HOSTPC_PHCD,
944 						hostpc_reg);
945 				spin_unlock_irqrestore(&ehci->lock, flags);
946 				msleep(5);/* wait to leave low-power mode */
947 				spin_lock_irqsave(&ehci->lock, flags);
948 			}
949 			/* resume signaling for 20 msec */
950 			temp &= ~PORT_WAKE_BITS;
951 			ehci_writel(ehci, temp | PORT_RESUME, status_reg);
952 			ehci->reset_done[wIndex] = jiffies
953 					+ msecs_to_jiffies(USB_RESUME_TIMEOUT);
954 			set_bit(wIndex, &ehci->resuming_ports);
955 			usb_hcd_start_port_resume(&hcd->self, wIndex);
956 			break;
957 		case USB_PORT_FEAT_C_SUSPEND:
958 			clear_bit(wIndex, &ehci->port_c_suspend);
959 			break;
960 		case USB_PORT_FEAT_POWER:
961 			if (HCS_PPC(ehci->hcs_params)) {
962 				spin_unlock_irqrestore(&ehci->lock, flags);
963 				ehci_port_power(ehci, wIndex, false);
964 				spin_lock_irqsave(&ehci->lock, flags);
965 			}
966 			break;
967 		case USB_PORT_FEAT_C_CONNECTION:
968 			ehci_writel(ehci, temp | PORT_CSC, status_reg);
969 			break;
970 		case USB_PORT_FEAT_C_OVER_CURRENT:
971 			ehci_writel(ehci, temp | PORT_OCC, status_reg);
972 			break;
973 		case USB_PORT_FEAT_C_RESET:
974 			/* GetPortStatus clears reset */
975 			break;
976 		default:
977 			goto error;
978 		}
979 		ehci_readl(ehci, &ehci->regs->command);	/* unblock posted write */
980 		break;
981 	case GetHubDescriptor:
982 		ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
983 			buf);
984 		break;
985 	case GetHubStatus:
986 		/* no hub-wide feature/status flags */
987 		memset (buf, 0, 4);
988 		//cpu_to_le32s ((u32 *) buf);
989 		break;
990 	case GetPortStatus:
991 		if (!wIndex || wIndex > ports)
992 			goto error;
993 		wIndex--;
994 		status = 0;
995 		temp = ehci_readl(ehci, status_reg);
996 
997 		// wPortChange bits
998 		if (temp & PORT_CSC)
999 			status |= USB_PORT_STAT_C_CONNECTION << 16;
1000 		if (temp & PORT_PEC)
1001 			status |= USB_PORT_STAT_C_ENABLE << 16;
1002 
1003 		if ((temp & PORT_OCC) && !ignore_oc){
1004 			status |= USB_PORT_STAT_C_OVERCURRENT << 16;
1005 
1006 			/*
1007 			 * Hubs should disable port power on over-current.
1008 			 * However, not all EHCI implementations do this
1009 			 * automatically, even if they _do_ support per-port
1010 			 * power switching; they're allowed to just limit the
1011 			 * current.  hub_wq will turn the power back on.
1012 			 */
1013 			if (((temp & PORT_OC) || (ehci->need_oc_pp_cycle))
1014 					&& HCS_PPC(ehci->hcs_params)) {
1015 				spin_unlock_irqrestore(&ehci->lock, flags);
1016 				ehci_port_power(ehci, wIndex, false);
1017 				spin_lock_irqsave(&ehci->lock, flags);
1018 				temp = ehci_readl(ehci, status_reg);
1019 			}
1020 		}
1021 
1022 		/* no reset or resume pending */
1023 		if (!ehci->reset_done[wIndex]) {
1024 
1025 			/* Remote Wakeup received? */
1026 			if (temp & PORT_RESUME) {
1027 				/* resume signaling for 20 msec */
1028 				ehci->reset_done[wIndex] = jiffies
1029 						+ msecs_to_jiffies(20);
1030 				usb_hcd_start_port_resume(&hcd->self, wIndex);
1031 				set_bit(wIndex, &ehci->resuming_ports);
1032 				/* check the port again */
1033 				mod_timer(&ehci_to_hcd(ehci)->rh_timer,
1034 						ehci->reset_done[wIndex]);
1035 			}
1036 
1037 		/* reset or resume not yet complete */
1038 		} else if (!time_after_eq(jiffies, ehci->reset_done[wIndex])) {
1039 			;	/* wait until it is complete */
1040 
1041 		/* resume completed */
1042 		} else if (test_bit(wIndex, &ehci->resuming_ports)) {
1043 			clear_bit(wIndex, &ehci->suspended_ports);
1044 			set_bit(wIndex, &ehci->port_c_suspend);
1045 			ehci->reset_done[wIndex] = 0;
1046 			usb_hcd_end_port_resume(&hcd->self, wIndex);
1047 
1048 			/* stop resume signaling */
1049 			temp &= ~(PORT_RWC_BITS | PORT_SUSPEND | PORT_RESUME);
1050 			ehci_writel(ehci, temp, status_reg);
1051 			clear_bit(wIndex, &ehci->resuming_ports);
1052 			retval = ehci_handshake(ehci, status_reg,
1053 					PORT_RESUME, 0, 2000 /* 2msec */);
1054 			if (retval != 0) {
1055 				ehci_err(ehci, "port %d resume error %d\n",
1056 						wIndex + 1, retval);
1057 				goto error;
1058 			}
1059 			temp = ehci_readl(ehci, status_reg);
1060 
1061 		/* whoever resets must GetPortStatus to complete it!! */
1062 		} else {
1063 			status |= USB_PORT_STAT_C_RESET << 16;
1064 			ehci->reset_done [wIndex] = 0;
1065 
1066 			/* force reset to complete */
1067 			ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESET),
1068 					status_reg);
1069 			/* REVISIT:  some hardware needs 550+ usec to clear
1070 			 * this bit; seems too long to spin routinely...
1071 			 */
1072 			retval = ehci_handshake(ehci, status_reg,
1073 					PORT_RESET, 0, 1000);
1074 			if (retval != 0) {
1075 				ehci_err (ehci, "port %d reset error %d\n",
1076 					wIndex + 1, retval);
1077 				goto error;
1078 			}
1079 
1080 			/* see what we found out */
1081 			temp = check_reset_complete (ehci, wIndex, status_reg,
1082 					ehci_readl(ehci, status_reg));
1083 		}
1084 
1085 		/* transfer dedicated ports to the companion hc */
1086 		if ((temp & PORT_CONNECT) &&
1087 				test_bit(wIndex, &ehci->companion_ports)) {
1088 			temp &= ~PORT_RWC_BITS;
1089 			temp |= PORT_OWNER;
1090 			ehci_writel(ehci, temp, status_reg);
1091 			ehci_dbg(ehci, "port %d --> companion\n", wIndex + 1);
1092 			temp = ehci_readl(ehci, status_reg);
1093 		}
1094 
1095 		/*
1096 		 * Even if OWNER is set, there's no harm letting hub_wq
1097 		 * see the wPortStatus values (they should all be 0 except
1098 		 * for PORT_POWER anyway).
1099 		 */
1100 
1101 		if (temp & PORT_CONNECT) {
1102 			status |= USB_PORT_STAT_CONNECTION;
1103 			// status may be from integrated TT
1104 			if (ehci->has_hostpc) {
1105 				temp1 = ehci_readl(ehci, hostpc_reg);
1106 				status |= ehci_port_speed(ehci, temp1);
1107 			} else
1108 				status |= ehci_port_speed(ehci, temp);
1109 		}
1110 		if (temp & PORT_PE)
1111 			status |= USB_PORT_STAT_ENABLE;
1112 
1113 		/* maybe the port was unsuspended without our knowledge */
1114 		if (temp & (PORT_SUSPEND|PORT_RESUME)) {
1115 			status |= USB_PORT_STAT_SUSPEND;
1116 		} else if (test_bit(wIndex, &ehci->suspended_ports)) {
1117 			clear_bit(wIndex, &ehci->suspended_ports);
1118 			clear_bit(wIndex, &ehci->resuming_ports);
1119 			ehci->reset_done[wIndex] = 0;
1120 			if (temp & PORT_PE)
1121 				set_bit(wIndex, &ehci->port_c_suspend);
1122 			usb_hcd_end_port_resume(&hcd->self, wIndex);
1123 		}
1124 
1125 		if (temp & PORT_OC)
1126 			status |= USB_PORT_STAT_OVERCURRENT;
1127 		if (temp & PORT_RESET)
1128 			status |= USB_PORT_STAT_RESET;
1129 		if (temp & PORT_POWER)
1130 			status |= USB_PORT_STAT_POWER;
1131 		if (test_bit(wIndex, &ehci->port_c_suspend))
1132 			status |= USB_PORT_STAT_C_SUSPEND << 16;
1133 
1134 		if (status & ~0xffff)	/* only if wPortChange is interesting */
1135 			dbg_port(ehci, "GetStatus", wIndex + 1, temp);
1136 		put_unaligned_le32(status, buf);
1137 		break;
1138 	case SetHubFeature:
1139 		switch (wValue) {
1140 		case C_HUB_LOCAL_POWER:
1141 		case C_HUB_OVER_CURRENT:
1142 			/* no hub-wide feature/status flags */
1143 			break;
1144 		default:
1145 			goto error;
1146 		}
1147 		break;
1148 	case SetPortFeature:
1149 		selector = wIndex >> 8;
1150 		wIndex &= 0xff;
1151 		if (unlikely(ehci->debug)) {
1152 			/* If the debug port is active any port
1153 			 * feature requests should get denied */
1154 			if (wIndex == HCS_DEBUG_PORT(ehci->hcs_params) &&
1155 			    (readl(&ehci->debug->control) & DBGP_ENABLED)) {
1156 				retval = -ENODEV;
1157 				goto error_exit;
1158 			}
1159 		}
1160 		if (!wIndex || wIndex > ports)
1161 			goto error;
1162 		wIndex--;
1163 		temp = ehci_readl(ehci, status_reg);
1164 		if (temp & PORT_OWNER)
1165 			break;
1166 
1167 		temp &= ~PORT_RWC_BITS;
1168 		switch (wValue) {
1169 		case USB_PORT_FEAT_SUSPEND:
1170 			if (ehci->no_selective_suspend)
1171 				break;
1172 			if ((temp & PORT_PE) == 0
1173 					|| (temp & PORT_RESET) != 0)
1174 				goto error;
1175 
1176 			/* After above check the port must be connected.
1177 			 * Set appropriate bit thus could put phy into low power
1178 			 * mode if we have tdi_phy_lpm feature
1179 			 */
1180 			temp &= ~PORT_WKCONN_E;
1181 			temp |= PORT_WKDISC_E | PORT_WKOC_E;
1182 			ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
1183 			if (ehci->has_tdi_phy_lpm) {
1184 				spin_unlock_irqrestore(&ehci->lock, flags);
1185 				msleep(5);/* 5ms for HCD enter low pwr mode */
1186 				spin_lock_irqsave(&ehci->lock, flags);
1187 				temp1 = ehci_readl(ehci, hostpc_reg);
1188 				ehci_writel(ehci, temp1 | HOSTPC_PHCD,
1189 					hostpc_reg);
1190 				temp1 = ehci_readl(ehci, hostpc_reg);
1191 				ehci_dbg(ehci, "Port%d phy low pwr mode %s\n",
1192 					wIndex, (temp1 & HOSTPC_PHCD) ?
1193 					"succeeded" : "failed");
1194 			}
1195 			set_bit(wIndex, &ehci->suspended_ports);
1196 			break;
1197 		case USB_PORT_FEAT_POWER:
1198 			if (HCS_PPC(ehci->hcs_params)) {
1199 				spin_unlock_irqrestore(&ehci->lock, flags);
1200 				ehci_port_power(ehci, wIndex, true);
1201 				spin_lock_irqsave(&ehci->lock, flags);
1202 			}
1203 			break;
1204 		case USB_PORT_FEAT_RESET:
1205 			if (temp & (PORT_SUSPEND|PORT_RESUME))
1206 				goto error;
1207 			/* line status bits may report this as low speed,
1208 			 * which can be fine if this root hub has a
1209 			 * transaction translator built in.
1210 			 */
1211 			if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
1212 					&& !ehci_is_TDI(ehci)
1213 					&& PORT_USB11 (temp)) {
1214 				ehci_dbg (ehci,
1215 					"port %d low speed --> companion\n",
1216 					wIndex + 1);
1217 				temp |= PORT_OWNER;
1218 			} else {
1219 				temp |= PORT_RESET;
1220 				temp &= ~PORT_PE;
1221 
1222 				/*
1223 				 * caller must wait, then call GetPortStatus
1224 				 * usb 2.0 spec says 50 ms resets on root
1225 				 */
1226 				ehci->reset_done [wIndex] = jiffies
1227 						+ msecs_to_jiffies (50);
1228 
1229 				/*
1230 				 * Force full-speed connect for FSL high-speed
1231 				 * erratum; disable HS Chirp by setting PFSC bit
1232 				 */
1233 				if (ehci_has_fsl_hs_errata(ehci))
1234 					temp |= (1 << PORTSC_FSL_PFSC);
1235 			}
1236 			ehci_writel(ehci, temp, status_reg);
1237 			break;
1238 
1239 		/* For downstream facing ports (these):  one hub port is put
1240 		 * into test mode according to USB2 11.24.2.13, then the hub
1241 		 * must be reset (which for root hub now means rmmod+modprobe,
1242 		 * or else system reboot).  See EHCI 2.3.9 and 4.14 for info
1243 		 * about the EHCI-specific stuff.
1244 		 */
1245 		case USB_PORT_FEAT_TEST:
1246 #ifdef CONFIG_USB_HCD_TEST_MODE
1247 			if (selector == EHSET_TEST_SINGLE_STEP_SET_FEATURE) {
1248 				spin_unlock_irqrestore(&ehci->lock, flags);
1249 				retval = ehset_single_step_set_feature(hcd,
1250 								wIndex + 1);
1251 				spin_lock_irqsave(&ehci->lock, flags);
1252 				break;
1253 			}
1254 #endif
1255 			if (!selector || selector > 5)
1256 				goto error;
1257 			spin_unlock_irqrestore(&ehci->lock, flags);
1258 			ehci_quiesce(ehci);
1259 			spin_lock_irqsave(&ehci->lock, flags);
1260 
1261 			/* Put all enabled ports into suspend */
1262 			while (ports--) {
1263 				u32 __iomem *sreg =
1264 						&ehci->regs->port_status[ports];
1265 
1266 				temp = ehci_readl(ehci, sreg) & ~PORT_RWC_BITS;
1267 				if (temp & PORT_PE)
1268 					ehci_writel(ehci, temp | PORT_SUSPEND,
1269 							sreg);
1270 			}
1271 
1272 			spin_unlock_irqrestore(&ehci->lock, flags);
1273 			ehci_halt(ehci);
1274 			spin_lock_irqsave(&ehci->lock, flags);
1275 
1276 			temp = ehci_readl(ehci, status_reg);
1277 			temp |= selector << 16;
1278 			ehci_writel(ehci, temp, status_reg);
1279 			break;
1280 
1281 		default:
1282 			goto error;
1283 		}
1284 		ehci_readl(ehci, &ehci->regs->command);	/* unblock posted writes */
1285 		break;
1286 
1287 	default:
1288 error:
1289 		/* "stall" on error */
1290 		retval = -EPIPE;
1291 	}
1292 error_exit:
1293 	spin_unlock_irqrestore (&ehci->lock, flags);
1294 	return retval;
1295 }
1296 EXPORT_SYMBOL_GPL(ehci_hub_control);
1297 
1298 static void ehci_relinquish_port(struct usb_hcd *hcd, int portnum)
1299 {
1300 	struct ehci_hcd		*ehci = hcd_to_ehci(hcd);
1301 
1302 	if (ehci_is_TDI(ehci))
1303 		return;
1304 	set_owner(ehci, --portnum, PORT_OWNER);
1305 }
1306 
1307 static int ehci_port_handed_over(struct usb_hcd *hcd, int portnum)
1308 {
1309 	struct ehci_hcd		*ehci = hcd_to_ehci(hcd);
1310 	u32 __iomem		*reg;
1311 
1312 	if (ehci_is_TDI(ehci))
1313 		return 0;
1314 	reg = &ehci->regs->port_status[portnum - 1];
1315 	return ehci_readl(ehci, reg) & PORT_OWNER;
1316 }
1317 
1318 static int ehci_port_power(struct ehci_hcd *ehci, int portnum, bool enable)
1319 {
1320 	struct usb_hcd *hcd = ehci_to_hcd(ehci);
1321 	u32 __iomem *status_reg = &ehci->regs->port_status[portnum];
1322 	u32 temp = ehci_readl(ehci, status_reg) & ~PORT_RWC_BITS;
1323 
1324 	if (enable)
1325 		ehci_writel(ehci, temp | PORT_POWER, status_reg);
1326 	else
1327 		ehci_writel(ehci, temp & ~PORT_POWER, status_reg);
1328 
1329 	if (hcd->driver->port_power)
1330 		hcd->driver->port_power(hcd, portnum, enable);
1331 
1332 	return 0;
1333 }
1334