aboutsummaryrefslogtreecommitdiff
path: root/drivers/usb/host/xhci-hub.c
blob: fef5a1f9d483ac99a49f9c904ea2c7f692442ace (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
/*
 * xHCI host controller driver
 *
 * Copyright (C) 2008 Intel Corp.
 *
 * Author: Sarah Sharp
 * Some code borrowed from the Linux EHCI driver.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <asm/unaligned.h>

#include "xhci.h"

#define	PORT_WAKE_BITS	(PORT_WKOC_E | PORT_WKDISC_E | PORT_WKCONN_E)
#define	PORT_RWC_BITS	(PORT_CSC | PORT_PEC | PORT_WRC | PORT_OCC | \
			 PORT_RC | PORT_PLC | PORT_PE)

static void xhci_hub_descriptor(struct xhci_hcd *xhci,
		struct usb_hub_descriptor *desc)
{
	int ports;
	u16 temp;

	ports = HCS_MAX_PORTS(xhci->hcs_params1);

	/* USB 3.0 hubs have a different descriptor, but we fake this for now */
	desc->bDescriptorType = 0x29;
	desc->bPwrOn2PwrGood = 10;	/* xhci section 5.4.9 says 20ms max */
	desc->bHubContrCurrent = 0;

	desc->bNbrPorts = ports;
	temp = 1 + (ports / 8);
	desc->bDescLength = 7 + 2 * temp;

	/* Why does core/hcd.h define bitmap?  It's just confusing. */
	memset(&desc->DeviceRemovable[0], 0, temp);
	memset(&desc->DeviceRemovable[temp], 0xff, temp);

	/* Ugh, these should be #defines, FIXME */
	/* Using table 11-13 in USB 2.0 spec. */
	temp = 0;
	/* Bits 1:0 - support port power switching, or power always on */
	if (HCC_PPC(xhci->hcc_params))
		temp |= 0x0001;
	else
		temp |= 0x0002;
	/* Bit  2 - root hubs are not part of a compound device */
	/* Bits 4:3 - individual port over current protection */
	temp |= 0x0008;
	/* Bits 6:5 - no TTs in root ports */
	/* Bit  7 - no port indicators */
	desc->wHubCharacteristics = (__force __u16) cpu_to_le16(temp);
}

static unsigned int xhci_port_speed(unsigned int port_status)
{
	if (DEV_LOWSPEED(port_status))
		return USB_PORT_STAT_LOW_SPEED;
	if (DEV_HIGHSPEED(port_status))
		return USB_PORT_STAT_HIGH_SPEED;
	if (DEV_SUPERSPEED(port_status))
		return USB_PORT_STAT_SUPER_SPEED;
	/*
	 * FIXME: Yes, we should check for full speed, but the core uses that as
	 * a default in portspeed() in usb/core/hub.c (which is the only place
	 * USB_PORT_STAT_*_SPEED is used).
	 */
	return 0;
}

/*
 * These bits are Read Only (RO) and should be saved and written to the
 * registers: 0, 3, 10:13, 30
 * connect status, over-current status, port speed, and device removable.
 * connect status and port speed are also sticky - meaning they're in
 * the AUX well and they aren't changed by a hot, warm, or cold reset.
 */
#define	XHCI_PORT_RO	((1<<0) | (1<<3) | (0xf<<10) | (1<<30))
/*
 * These bits are RW; writing a 0 clears the bit, writing a 1 sets the bit:
 * bits 5:8, 9, 14:15, 25:27
 * link state, port power, port indicator state, "wake on" enable state
 */
#define XHCI_PORT_RWS	((0xf<<5) | (1<<9) | (0x3<<14) | (0x7<<25))
/*
 * These bits are RW; writing a 1 sets the bit, writing a 0 has no effect:
 * bit 4 (port reset)
 */
#define	XHCI_PORT_RW1S	((1<<4))
/*
 * These bits are RW; writing a 1 clears the bit, writing a 0 has no effect:
 * bits 1, 17, 18, 19, 20, 21, 22, 23
 * port enable/disable, and
 * change bits: connect, PED, warm port reset changed (reserved zero for USB 2.0 ports),
 * over-current, reset, link state, and L1 change
 */
#define XHCI_PORT_RW1CS	((1<<1) | (0x7f<<17))
/*
 * Bit 16 is RW, and writing a '1' to it causes the link state control to be
 * latched in
 */
#define	XHCI_PORT_RW	((1<<16))
/*
 * These bits are Reserved Zero (RsvdZ) and zero should be written to them:
 * bits 2, 24, 28:31
 */
#define	XHCI_PORT_RZ	((1<<2) | (1<<24) | (0xf<<28))

/*
 * Given a port state, this function returns a value that would result in the
 * port being in the same state, if the value was written to the port status
 * control register.
 * Save Read Only (RO) bits and save read/write bits where
 * writing a 0 clears the bit and writing a 1 sets the bit (RWS).
 * For all other types (RW1S, RW1CS, RW, and RZ), writing a '0' has no effect.
 */
u32 xhci_port_state_to_neutral(u32 state)
{
	/* Save read-only status and port state */
	return (state & XHCI_PORT_RO) | (state & XHCI_PORT_RWS);
}

/*
 * find slot id based on port number.
 */
int xhci_find_slot_id_by_port(struct xhci_hcd *xhci, u16 port)
{
	int slot_id;
	int i;

	slot_id = 0;
	for (i = 0; i < MAX_HC_SLOTS; i++) {
		if (!xhci->devs[i])
			continue;
		if (xhci->devs[i]->port == port) {
			slot_id = i;
			break;
		}
	}

	return slot_id;
}

/*
 * Stop device
 * It issues stop endpoint command for EP 0 to 30. And wait the last command
 * to complete.
 * suspend will set to 1, if suspend bit need to set in command.
 */
static int xhci_stop_device(struct xhci_hcd *xhci, int slot_id, int suspend)
{
	struct xhci_virt_device *virt_dev;
	struct xhci_command *cmd;
	unsigned long flags;
	int timeleft;
	int ret;
	int i;

	ret = 0;
	virt_dev = xhci->devs[slot_id];
	cmd = xhci_alloc_command(xhci, false, true, GFP_NOIO);
	if (!cmd) {
		xhci_dbg(xhci, "Couldn't allocate command structure.\n");
		return -ENOMEM;
	}

	spin_lock_irqsave(&xhci->lock, flags);
	for (i = LAST_EP_INDEX; i > 0; i--) {
		if (virt_dev->eps[i].ring && virt_dev->eps[i].ring->dequeue)
			xhci_queue_stop_endpoint(xhci, slot_id, i, suspend);
	}
	cmd->command_trb = xhci->cmd_ring->enqueue;
	list_add_tail(&cmd->cmd_list, &virt_dev->cmd_list);
	xhci_queue_stop_endpoint(xhci, slot_id, 0, suspend);
	xhci_ring_cmd_db(xhci);
	spin_unlock_irqrestore(&xhci->lock, flags);

	/* Wait for last stop endpoint command to finish */
	timeleft = wait_for_completion_interruptible_timeout(
			cmd->completion,
			USB_CTRL_SET_TIMEOUT);
	if (timeleft <= 0) {
		xhci_warn(xhci, "%s while waiting for stop endpoint command\n",
				timeleft == 0 ? "Timeout" : "Signal");
		spin_lock_irqsave(&xhci->lock, flags);
		/* The timeout might have raced with the event ring handler, so
		 * only delete from the list if the item isn't poisoned.
		 */
		if (cmd->cmd_list.next != LIST_POISON1)
			list_del(&cmd->cmd_list);
		spin_unlock_irqrestore(&xhci->lock, flags);
		ret = -ETIME;
		goto command_cleanup;
	}

command_cleanup:
	xhci_free_command(xhci, cmd);
	return ret;
}

/*
 * Ring device, it rings the all doorbells unconditionally.
 */
void xhci_ring_device(struct xhci_hcd *xhci, int slot_id)
{
	int i;

	for (i = 0; i < LAST_EP_INDEX + 1; i++)
		if (xhci->devs[slot_id]->eps[i].ring &&
		    xhci->devs[slot_id]->eps[i].ring->dequeue)
			xhci_ring_ep_doorbell(xhci, slot_id, i, 0);

	return;
}

static void xhci_disable_port(struct xhci_hcd *xhci, u16 wIndex,
		u32 __iomem *addr, u32 port_status)
{
	/* Write 1 to disable the port */
	xhci_writel(xhci, port_status | PORT_PE, addr);
	port_status = xhci_readl(xhci, addr);
	xhci_dbg(xhci, "disable port, actual port %d status  = 0x%x\n",
			wIndex, port_status);
}

static void xhci_clear_port_change_bit(struct xhci_hcd *xhci, u16 wValue,
		u16 wIndex, u32 __iomem *addr, u32 port_status)
{
	char *port_change_bit;
	u32 status;

	switch (wValue) {
	case USB_PORT_FEAT_C_RESET:
		status = PORT_RC;
		port_change_bit = "reset";
		break;
	case USB_PORT_FEAT_C_CONNECTION:
		status = PORT_CSC;
		port_change_bit = "connect";
		break;
	case USB_PORT_FEAT_C_OVER_CURRENT:
		status = PORT_OCC;
		port_change_bit = "over-current";
		break;
	case USB_PORT_FEAT_C_ENABLE:
		status = PORT_PEC;
		port_change_bit = "enable/disable";
		break;
	case USB_PORT_FEAT_C_SUSPEND:
		status = PORT_PLC;
		port_change_bit = "suspend/resume";
		break;
	default:
		/* Should never happen */
		return;
	}
	/* Change bits are all write 1 to clear */
	xhci_writel(xhci, port_status | status, addr);
	port_status = xhci_readl(xhci, addr);
	xhci_dbg(xhci, "clear port %s change, actual port %d status  = 0x%x\n",
			port_change_bit, wIndex, port_status);
}

int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
		u16 wIndex, char *buf, u16 wLength)
{
	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
	int ports;
	unsigned long flags;
	u32 temp, temp1, status;
	int retval = 0;
	u32 __iomem *addr;
	int slot_id;

	ports = HCS_MAX_PORTS(xhci->hcs_params1);

	spin_lock_irqsave(&xhci->lock, flags);
	switch (typeReq) {
	case GetHubStatus:
		/* No power source, over-current reported per port */
		memset(buf, 0, 4);
		break;
	case GetHubDescriptor:
		xhci_hub_descriptor(xhci, (struct usb_hub_descriptor *) buf);
		break;
	case GetPortStatus:
		if (!wIndex || wIndex > ports)
			goto error;
		wIndex--;
		status = 0;
		addr = &xhci->op_regs->port_status_base + NUM_PORT_REGS*(wIndex & 0xff);
		temp = xhci_readl(xhci, addr);
		xhci_dbg(xhci, "get port status, actual port %d status  = 0x%x\n", wIndex, temp);

		/* wPortChange bits */
		if (temp & PORT_CSC)
			status |= USB_PORT_STAT_C_CONNECTION << 16;
		if (temp & PORT_PEC)
			status |= USB_PORT_STAT_C_ENABLE << 16;
		if ((temp & PORT_OCC))
			status |= USB_PORT_STAT_C_OVERCURRENT << 16;
		/*
		 * FIXME ignoring reset and USB 2.1/3.0 specific
		 * changes
		 */
		if ((temp & PORT_PLS_MASK) == XDEV_U3
			&& (temp & PORT_POWER))
			status |= 1 << USB_PORT_FEAT_SUSPEND;
		if ((temp & PORT_PLS_MASK) == XDEV_RESUME) {
			if ((temp & PORT_RESET) || !(temp & PORT_PE))
				goto error;
			if (!DEV_SUPERSPEED(temp) && time_after_eq(jiffies,
						xhci->resume_done[wIndex])) {
				xhci_dbg(xhci, "Resume USB2 port %d\n",
					wIndex + 1);
				xhci->resume_done[wIndex] = 0;
				temp1 = xhci_port_state_to_neutral(temp);
				temp1 &= ~PORT_PLS_MASK;
				temp1 |= PORT_LINK_STROBE | XDEV_U0;
				xhci_writel(xhci, temp1, addr);

				xhci_dbg(xhci, "set port %d resume\n",
					wIndex + 1);
				slot_id = xhci_find_slot_id_by_port(xhci,
								 wIndex + 1);
				if (!slot_id) {
					xhci_dbg(xhci, "slot_id is zero\n");
					goto error;
				}
				xhci_ring_device(xhci, slot_id);
				xhci->port_c_suspend[wIndex >> 5] |=
						1 << (wIndex & 31);
				xhci->suspended_ports[wIndex >> 5] &=
						~(1 << (wIndex & 31));
			}
		}
		if ((temp & PORT_PLS_MASK) == XDEV_U0
			&& (temp & PORT_POWER)
			&& (xhci->suspended_ports[wIndex >> 5] &
			    (1 << (wIndex & 31)))) {
			xhci->suspended_ports[wIndex >> 5] &=
					~(1 << (wIndex & 31));
			xhci->port_c_suspend[wIndex >> 5] |=
					1 << (wIndex & 31);
		}
		if (temp & PORT_CONNECT) {
			status |= USB_PORT_STAT_CONNECTION;
			status |= xhci_port_speed(temp);
		}
		if (temp & PORT_PE)
			status |= USB_PORT_STAT_ENABLE;
		if (temp & PORT_OC)
			status |= USB_PORT_STAT_OVERCURRENT;
		if (temp & PORT_RESET)
			status |= USB_PORT_STAT_RESET;
		if (temp & PORT_POWER)
			status |= USB_PORT_STAT_POWER;
		if (xhci->port_c_suspend[wIndex >> 5] & (1 << (wIndex & 31)))
			status |= 1 << USB_PORT_FEAT_C_SUSPEND;
		xhci_dbg(xhci, "Get port status returned 0x%x\n", status);
		put_unaligned(cpu_to_le32(status), (__le32 *) buf);
		break;
	case SetPortFeature:
		wIndex &= 0xff;
		if (!wIndex || wIndex > ports)
			goto error;
		wIndex--;
		addr = &xhci->op_regs->port_status_base + NUM_PORT_REGS*(wIndex & 0xff);
		temp = xhci_readl(xhci, addr);
		temp = xhci_port_state_to_neutral(temp);
		switch (wValue) {
		case USB_PORT_FEAT_SUSPEND:
			temp = xhci_readl(xhci, addr);
			/* In spec software should not attempt to suspend
			 * a port unless the port reports that it is in the
			 * enabled (PED = ‘1’,PLS < ‘3’) state.
			 */
			if ((temp & PORT_PE) == 0 || (temp & PORT_RESET)
				|| (temp & PORT_PLS_MASK) >= XDEV_U3) {
				xhci_warn(xhci, "USB core suspending device "
					  "not in U0/U1/U2.\n");
				goto error;
			}

			slot_id = xhci_find_slot_id_by_port(xhci, wIndex + 1);
			if (!slot_id) {
				xhci_warn(xhci, "slot_id is zero\n");
				goto error;
			}
			/* unlock to execute stop endpoint commands */
			spin_unlock_irqrestore(&xhci->lock, flags);
			xhci_stop_device(xhci, slot_id, 1);
			spin_lock_irqsave(&xhci->lock, flags);

			temp = xhci_port_state_to_neutral(temp);
			temp &= ~PORT_PLS_MASK;
			temp |= PORT_LINK_STROBE | XDEV_U3;
			xhci_writel(xhci, temp, addr);

			spin_unlock_irqrestore(&xhci->lock, flags);
			msleep(10); /* wait device to enter */
			spin_lock_irqsave(&xhci->lock, flags);

			temp = xhci_readl(xhci, addr);
			xhci->suspended_ports[wIndex >> 5] |=
					1 << (wIndex & (31));
			break;
		case USB_PORT_FEAT_POWER:
			/*
			 * Turn on ports, even if there isn't per-port switching.
			 * HC will report connect events even before this is set.
			 * However, khubd will ignore the roothub events until
			 * the roothub is registered.
			 */
			xhci_writel(xhci, temp | PORT_POWER, addr);

			temp = xhci_readl(xhci, addr);
			xhci_dbg(xhci, "set port power, actual port %d status  = 0x%x\n", wIndex, temp);
			break;
		case USB_PORT_FEAT_RESET:
			temp = (temp | PORT_RESET);
			xhci_writel(xhci, temp, addr);

			temp = xhci_readl(xhci, addr);
			xhci_dbg(xhci, "set port reset, actual port %d status  = 0x%x\n", wIndex, temp);
			break;
		default:
			goto error;
		}
		temp = xhci_readl(xhci, addr); /* unblock any posted writes */
		break;
	case ClearPortFeature:
		if (!wIndex || wIndex > ports)
			goto error;
		wIndex--;
		addr = &xhci->op_regs->port_status_base +
			NUM_PORT_REGS*(wIndex & 0xff);
		temp = xhci_readl(xhci, addr);
		temp = xhci_port_state_to_neutral(temp);
		switch (wValue) {
		case USB_PORT_FEAT_SUSPEND:
			temp = xhci_readl(xhci, addr);
			xhci_dbg(xhci, "clear USB_PORT_FEAT_SUSPEND\n");
			xhci_dbg(xhci, "PORTSC %04x\n", temp);
			if (temp & PORT_RESET)
				goto error;
			if (temp & XDEV_U3) {
				if ((temp & PORT_PE) == 0)
					goto error;
				if (DEV_SUPERSPEED(temp)) {
					temp = xhci_port_state_to_neutral(temp);
					temp &= ~PORT_PLS_MASK;
					temp |= PORT_LINK_STROBE | XDEV_U0;
					xhci_writel(xhci, temp, addr);
					xhci_readl(xhci, addr);
				} else {
					temp = xhci_port_state_to_neutral(temp);
					temp &= ~PORT_PLS_MASK;
					temp |= PORT_LINK_STROBE | XDEV_RESUME;
					xhci_writel(xhci, temp, addr);

					spin_unlock_irqrestore(&xhci->lock,
							       flags);
					msleep(20);
					spin_lock_irqsave(&xhci->lock, flags);

					temp = xhci_readl(xhci, addr);
					temp = xhci_port_state_to_neutral(temp);
					temp &= ~PORT_PLS_MASK;
					temp |= PORT_LINK_STROBE | XDEV_U0;
					xhci_writel(xhci, temp, addr);
				}
				xhci->port_c_suspend[wIndex >> 5] |=
						1 << (wIndex & 31);
			}

			slot_id = xhci_find_slot_id_by_port(xhci, wIndex + 1);
			if (!slot_id) {
				xhci_dbg(xhci, "slot_id is zero\n");
				goto error;
			}
			xhci_ring_device(xhci, slot_id);
			break;
		case USB_PORT_FEAT_C_SUSPEND:
			xhci->port_c_suspend[wIndex >> 5] &=
					~(1 << (wIndex & 31));
		case USB_PORT_FEAT_C_RESET:
		case USB_PORT_FEAT_C_CONNECTION:
		case USB_PORT_FEAT_C_OVER_CURRENT:
		case USB_PORT_FEAT_C_ENABLE:
			xhci_clear_port_change_bit(xhci, wValue, wIndex,
					addr, temp);
			break;
		case USB_PORT_FEAT_ENABLE:
			xhci_disable_port(xhci, wIndex, addr, temp);
			break;
		default:
			goto error;
		}
		break;
	default:
error:
		/* "stall" on error */
		retval = -EPIPE;
	}
	spin_unlock_irqrestore(&xhci->lock, flags);
	return retval;
}

/*
 * Returns 0 if the status hasn't changed, or the number of bytes in buf.
 * Ports are 0-indexed from the HCD point of view,
 * and 1-indexed from the USB core pointer of view.
 *
 * Note that the status change bits will be cleared as soon as a port status
 * change event is generated, so we use the saved status from that event.
 */
int xhci_hub_status_data(struct usb_hcd *hcd, char *buf)
{
	unsigned long flags;
	u32 temp, status;
	u32 mask;
	int i, retval;
	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
	int ports;
	u32 __iomem *addr;

	ports = HCS_MAX_PORTS(xhci->hcs_params1);

	/* Initial status is no changes */
	retval = (ports + 8) / 8;
	memset(buf, 0, retval);
	status = 0;

	mask = PORT_CSC | PORT_PEC | PORT_OCC;

	spin_lock_irqsave(&xhci->lock, flags);
	/* For each port, did anything change?  If so, set that bit in buf. */
	for (i = 0; i < ports; i++) {
		addr = &xhci->op_regs->port_status_base +
			NUM_PORT_REGS*i;
		temp = xhci_readl(xhci, addr);
		if ((temp & mask) != 0 ||
			(xhci->port_c_suspend[i >> 5] &	1 << (i & 31)) ||
			(xhci->resume_done[i] && time_after_eq(
			    jiffies, xhci->resume_done[i]))) {
			buf[(i + 1) / 8] |= 1 << (i + 1) % 8;
			status = 1;
		}
	}
	spin_unlock_irqrestore(&xhci->lock, flags);
	return status ? retval : 0;
}

#ifdef CONFIG_PM

int xhci_bus_suspend(struct usb_hcd *hcd)
{
	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
	int port;
	unsigned long flags;

	xhci_dbg(xhci, "suspend root hub\n");

	spin_lock_irqsave(&xhci->lock, flags);

	if (hcd->self.root_hub->do_remote_wakeup) {
		port = HCS_MAX_PORTS(xhci->hcs_params1);
		while (port--) {
			if (xhci->resume_done[port] != 0) {
				spin_unlock_irqrestore(&xhci->lock, flags);
				xhci_dbg(xhci, "suspend failed because "
						"port %d is resuming\n",
						port + 1);
				return -EBUSY;
			}
		}
	}

	port = HCS_MAX_PORTS(xhci->hcs_params1);
	xhci->bus_suspended = 0;
	while (port--) {
		/* suspend the port if the port is not suspended */
		u32 __iomem *addr;
		u32 t1, t2;
		int slot_id;

		addr = &xhci->op_regs->port_status_base +
			NUM_PORT_REGS * (port & 0xff);
		t1 = xhci_readl(xhci, addr);
		t2 = xhci_port_state_to_neutral(t1);

		if ((t1 & PORT_PE) && !(t1 & PORT_PLS_MASK)) {
			xhci_dbg(xhci, "port %d not suspended\n", port);
			slot_id = xhci_find_slot_id_by_port(xhci, port + 1);
			if (slot_id) {
				spin_unlock_irqrestore(&xhci->lock, flags);
				xhci_stop_device(xhci, slot_id, 1);
				spin_lock_irqsave(&xhci->lock, flags);
			}
			t2 &= ~PORT_PLS_MASK;
			t2 |= PORT_LINK_STROBE | XDEV_U3;
			set_bit(port, &xhci->bus_suspended);
		}
		if (hcd->self.root_hub->do_remote_wakeup) {
			if (t1 & PORT_CONNECT) {
				t2 |= PORT_WKOC_E | PORT_WKDISC_E;
				t2 &= ~PORT_WKCONN_E;
			} else {
				t2 |= PORT_WKOC_E | PORT_WKCONN_E;
				t2 &= ~PORT_WKDISC_E;
			}
		} else
			t2 &= ~PORT_WAKE_BITS;

		t1 = xhci_port_state_to_neutral(t1);
		if (t1 != t2)
			xhci_writel(xhci, t2, addr);

		if (DEV_HIGHSPEED(t1)) {
			/* enable remote wake up for USB 2.0 */
			u32 __iomem *addr;
			u32 tmp;

			addr = &xhci->op_regs->port_power_base +
				NUM_PORT_REGS * (port & 0xff);
			tmp = xhci_readl(xhci, addr);
			tmp |= PORT_RWE;
			xhci_writel(xhci, tmp, addr);
		}
	}
	hcd->state = HC_STATE_SUSPENDED;
	xhci->next_statechange = jiffies + msecs_to_jiffies(10);
	spin_unlock_irqrestore(&xhci->lock, flags);
	return 0;
}

int xhci_bus_resume(struct usb_hcd *hcd)
{
	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
	int port;
	u32 temp;
	unsigned long flags;

	xhci_dbg(xhci, "resume root hub\n");

	if (time_before(jiffies, xhci->next_statechange))
		msleep(5);

	spin_lock_irqsave(&xhci->lock, flags);
	if (!HCD_HW_ACCESSIBLE(hcd)) {
		spin_unlock_irqrestore(&xhci->lock, flags);
		return -ESHUTDOWN;
	}

	/* delay the irqs */
	temp = xhci_readl(xhci, &xhci->op_regs->command);
	temp &= ~CMD_EIE;
	xhci_writel(xhci, temp, &xhci->op_regs->command);

	port = HCS_MAX_PORTS(xhci->hcs_params1);
	while (port--) {
		/* Check whether need resume ports. If needed
		   resume port and disable remote wakeup */
		u32 __iomem *addr;
		u32 temp;
		int slot_id;

		addr = &xhci->op_regs->port_status_base +
			NUM_PORT_REGS * (port & 0xff);
		temp = xhci_readl(xhci, addr);
		if (DEV_SUPERSPEED(temp))
			temp &= ~(PORT_RWC_BITS | PORT_CEC | PORT_WAKE_BITS);
		else
			temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
		if (test_bit(port, &xhci->bus_suspended) &&
		    (temp & PORT_PLS_MASK)) {
			if (DEV_SUPERSPEED(temp)) {
				temp = xhci_port_state_to_neutral(temp);
				temp &= ~PORT_PLS_MASK;
				temp |= PORT_LINK_STROBE | XDEV_U0;
				xhci_writel(xhci, temp, addr);
			} else {
				temp = xhci_port_state_to_neutral(temp);
				temp &= ~PORT_PLS_MASK;
				temp |= PORT_LINK_STROBE | XDEV_RESUME;
				xhci_writel(xhci, temp, addr);

				spin_unlock_irqrestore(&xhci->lock, flags);
				msleep(20);
				spin_lock_irqsave(&xhci->lock, flags);

				temp = xhci_readl(xhci, addr);
				temp = xhci_port_state_to_neutral(temp);
				temp &= ~PORT_PLS_MASK;
				temp |= PORT_LINK_STROBE | XDEV_U0;
				xhci_writel(xhci, temp, addr);
			}
			slot_id = xhci_find_slot_id_by_port(xhci, port + 1);
			if (slot_id)
				xhci_ring_device(xhci, slot_id);
		} else
			xhci_writel(xhci, temp, addr);

		if (DEV_HIGHSPEED(temp)) {
			/* disable remote wake up for USB 2.0 */
			u32 __iomem *addr;
			u32 tmp;

			addr = &xhci->op_regs->port_power_base +
				NUM_PORT_REGS * (port & 0xff);
			tmp = xhci_readl(xhci, addr);
			tmp &= ~PORT_RWE;
			xhci_writel(xhci, tmp, addr);
		}
	}

	(void) xhci_readl(xhci, &xhci->op_regs->command);

	xhci->next_statechange = jiffies + msecs_to_jiffies(5);
	hcd->state = HC_STATE_RUNNING;
	/* re-enable irqs */
	temp = xhci_readl(xhci, &xhci->op_regs->command);
	temp |= CMD_EIE;
	xhci_writel(xhci, temp, &xhci->op_regs->command);
	temp = xhci_readl(xhci, &xhci->op_regs->command);

	spin_unlock_irqrestore(&xhci->lock, flags);
	return 0;
}

#endif	/* CONFIG_PM */