summaryrefslogtreecommitdiff
path: root/drivers/usb/core/hcd-pci.c
blob: 990280688b254d913d843bde17dae0a8be203778 (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
// SPDX-License-Identifier: GPL-2.0+
/*
 * (C) Copyright David Brownell 2000-2002
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>

#include <asm/io.h>
#include <asm/irq.h>

#ifdef CONFIG_PPC_PMAC
#include <asm/machdep.h>
#include <asm/pmac_feature.h>
#endif

#include "usb.h"


/* PCI-based HCs are common, but plenty of non-PCI HCs are used too */

/*
 * Coordinate handoffs between EHCI and companion controllers
 * during EHCI probing and system resume.
 */

static DECLARE_RWSEM(companions_rwsem);

#define CL_UHCI		PCI_CLASS_SERIAL_USB_UHCI
#define CL_OHCI		PCI_CLASS_SERIAL_USB_OHCI
#define CL_EHCI		PCI_CLASS_SERIAL_USB_EHCI

static inline int is_ohci_or_uhci(struct pci_dev *pdev)
{
	return pdev->class == CL_OHCI || pdev->class == CL_UHCI;
}

typedef void (*companion_fn)(struct pci_dev *pdev, struct usb_hcd *hcd,
		struct pci_dev *companion, struct usb_hcd *companion_hcd);

/* Iterate over PCI devices in the same slot as pdev and call fn for each */
static void for_each_companion(struct pci_dev *pdev, struct usb_hcd *hcd,
		companion_fn fn)
{
	struct pci_dev		*companion;
	struct usb_hcd		*companion_hcd;
	unsigned int		slot = PCI_SLOT(pdev->devfn);

	/*
	 * Iterate through other PCI functions in the same slot.
	 * If the function's drvdata isn't set then it isn't bound to
	 * a USB host controller driver, so skip it.
	 */
	companion = NULL;
	for_each_pci_dev(companion) {
		if (companion->bus != pdev->bus ||
				PCI_SLOT(companion->devfn) != slot)
			continue;

		/*
		 * Companion device should be either UHCI,OHCI or EHCI host
		 * controller, otherwise skip.
		 */
		if (companion->class != CL_UHCI && companion->class != CL_OHCI &&
				companion->class != CL_EHCI)
			continue;

		companion_hcd = pci_get_drvdata(companion);
		if (!companion_hcd || !companion_hcd->self.root_hub)
			continue;
		fn(pdev, hcd, companion, companion_hcd);
	}
}

/*
 * We're about to add an EHCI controller, which will unceremoniously grab
 * all the port connections away from its companions.  To prevent annoying
 * error messages, lock the companion's root hub and gracefully unconfigure
 * it beforehand.  Leave it locked until the EHCI controller is all set.
 */
static void ehci_pre_add(struct pci_dev *pdev, struct usb_hcd *hcd,
		struct pci_dev *companion, struct usb_hcd *companion_hcd)
{
	struct usb_device *udev;

	if (is_ohci_or_uhci(companion)) {
		udev = companion_hcd->self.root_hub;
		usb_lock_device(udev);
		usb_set_configuration(udev, 0);
	}
}

/*
 * Adding the EHCI controller has either succeeded or failed.  Set the
 * companion pointer accordingly, and in either case, reconfigure and
 * unlock the root hub.
 */
static void ehci_post_add(struct pci_dev *pdev, struct usb_hcd *hcd,
		struct pci_dev *companion, struct usb_hcd *companion_hcd)
{
	struct usb_device *udev;

	if (is_ohci_or_uhci(companion)) {
		if (dev_get_drvdata(&pdev->dev)) {	/* Succeeded */
			dev_dbg(&pdev->dev, "HS companion for %s\n",
					dev_name(&companion->dev));
			companion_hcd->self.hs_companion = &hcd->self;
		}
		udev = companion_hcd->self.root_hub;
		usb_set_configuration(udev, 1);
		usb_unlock_device(udev);
	}
}

/*
 * We just added a non-EHCI controller.  Find the EHCI controller to
 * which it is a companion, and store a pointer to the bus structure.
 */
static void non_ehci_add(struct pci_dev *pdev, struct usb_hcd *hcd,
		struct pci_dev *companion, struct usb_hcd *companion_hcd)
{
	if (is_ohci_or_uhci(pdev) && companion->class == CL_EHCI) {
		dev_dbg(&pdev->dev, "FS/LS companion for %s\n",
				dev_name(&companion->dev));
		hcd->self.hs_companion = &companion_hcd->self;
	}
}

/* We are removing an EHCI controller.  Clear the companions' pointers. */
static void ehci_remove(struct pci_dev *pdev, struct usb_hcd *hcd,
		struct pci_dev *companion, struct usb_hcd *companion_hcd)
{
	if (is_ohci_or_uhci(companion))
		companion_hcd->self.hs_companion = NULL;
}

#ifdef	CONFIG_PM

/* An EHCI controller must wait for its companions before resuming. */
static void ehci_wait_for_companions(struct pci_dev *pdev, struct usb_hcd *hcd,
		struct pci_dev *companion, struct usb_hcd *companion_hcd)
{
	if (is_ohci_or_uhci(companion))
		device_pm_wait_for_dev(&pdev->dev, &companion->dev);
}

#endif	/* CONFIG_PM */

/*-------------------------------------------------------------------------*/

/* configure so an HC device and id are always provided */
/* always called with process context; sleeping is OK */

/**
 * usb_hcd_pci_probe - initialize PCI-based HCDs
 * @dev: USB Host Controller being probed
 * @driver: USB HC driver handle
 *
 * Context: task context, might sleep
 *
 * Allocates basic PCI resources for this USB host controller, and
 * then invokes the start() method for the HCD associated with it
 * through the hotplug entry's driver_data.
 *
 * Store this function in the HCD's struct pci_driver as probe().
 *
 * Return: 0 if successful.
 */
int usb_hcd_pci_probe(struct pci_dev *dev, const struct hc_driver *driver)
{
	struct usb_hcd		*hcd;
	int			retval;
	int			hcd_irq = 0;

	if (usb_disabled())
		return -ENODEV;

	if (!driver)
		return -EINVAL;

	if (pci_enable_device(dev) < 0)
		return -ENODEV;

	/*
	 * The xHCI driver has its own irq management
	 * make sure irq setup is not touched for xhci in generic hcd code
	 */
	if ((driver->flags & HCD_MASK) < HCD_USB3) {
		retval = pci_alloc_irq_vectors(dev, 1, 1, PCI_IRQ_LEGACY | PCI_IRQ_MSI);
		if (retval < 0) {
			dev_err(&dev->dev,
			"Found HC with no IRQ. Check BIOS/PCI %s setup!\n",
				pci_name(dev));
			retval = -ENODEV;
			goto disable_pci;
		}
		hcd_irq = pci_irq_vector(dev, 0);
	}

	hcd = usb_create_hcd(driver, &dev->dev, pci_name(dev));
	if (!hcd) {
		retval = -ENOMEM;
		goto free_irq_vectors;
	}

	hcd->amd_resume_bug = (usb_hcd_amd_remote_wakeup_quirk(dev) &&
			driver->flags & (HCD_USB11 | HCD_USB3)) ? 1 : 0;

	if (driver->flags & HCD_MEMORY) {
		/* EHCI, OHCI */
		hcd->rsrc_start = pci_resource_start(dev, 0);
		hcd->rsrc_len = pci_resource_len(dev, 0);
		if (!devm_request_mem_region(&dev->dev, hcd->rsrc_start,
				hcd->rsrc_len, driver->description)) {
			dev_dbg(&dev->dev, "controller already in use\n");
			retval = -EBUSY;
			goto put_hcd;
		}
		hcd->regs = devm_ioremap(&dev->dev, hcd->rsrc_start,
				hcd->rsrc_len);
		if (hcd->regs == NULL) {
			dev_dbg(&dev->dev, "error mapping memory\n");
			retval = -EFAULT;
			goto put_hcd;
		}

	} else {
		/* UHCI */
		int	region;

		for (region = 0; region < PCI_STD_NUM_BARS; region++) {
			if (!(pci_resource_flags(dev, region) &
					IORESOURCE_IO))
				continue;

			hcd->rsrc_start = pci_resource_start(dev, region);
			hcd->rsrc_len = pci_resource_len(dev, region);
			if (devm_request_region(&dev->dev, hcd->rsrc_start,
					hcd->rsrc_len, driver->description))
				break;
		}
		if (region == PCI_STD_NUM_BARS) {
			dev_dbg(&dev->dev, "no i/o regions available\n");
			retval = -EBUSY;
			goto put_hcd;
		}
	}

	pci_set_master(dev);

	/* Note: dev_set_drvdata must be called while holding the rwsem */
	if (dev->class == CL_EHCI) {
		down_write(&companions_rwsem);
		dev_set_drvdata(&dev->dev, hcd);
		for_each_companion(dev, hcd, ehci_pre_add);
		retval = usb_add_hcd(hcd, hcd_irq, IRQF_SHARED);
		if (retval != 0)
			dev_set_drvdata(&dev->dev, NULL);
		for_each_companion(dev, hcd, ehci_post_add);
		up_write(&companions_rwsem);
	} else {
		down_read(&companions_rwsem);
		dev_set_drvdata(&dev->dev, hcd);
		retval = usb_add_hcd(hcd, hcd_irq, IRQF_SHARED);
		if (retval != 0)
			dev_set_drvdata(&dev->dev, NULL);
		else
			for_each_companion(dev, hcd, non_ehci_add);
		up_read(&companions_rwsem);
	}

	if (retval != 0)
		goto put_hcd;
	device_wakeup_enable(hcd->self.controller);

	if (pci_dev_run_wake(dev))
		pm_runtime_put_noidle(&dev->dev);
	return retval;

put_hcd:
	usb_put_hcd(hcd);
free_irq_vectors:
	if ((driver->flags & HCD_MASK) < HCD_USB3)
		pci_free_irq_vectors(dev);
disable_pci:
	pci_disable_device(dev);
	dev_err(&dev->dev, "init %s fail, %d\n", pci_name(dev), retval);
	return retval;
}
EXPORT_SYMBOL_GPL(usb_hcd_pci_probe);


/* may be called without controller electrically present */
/* may be called with controller, bus, and devices active */

/**
 * usb_hcd_pci_remove - shutdown processing for PCI-based HCDs
 * @dev: USB Host Controller being removed
 *
 * Context: task context, might sleep
 *
 * Reverses the effect of usb_hcd_pci_probe(), first invoking
 * the HCD's stop() method.  It is always called from a thread
 * context, normally "rmmod", "apmd", or something similar.
 *
 * Store this function in the HCD's struct pci_driver as remove().
 */
void usb_hcd_pci_remove(struct pci_dev *dev)
{
	struct usb_hcd		*hcd;
	int			hcd_driver_flags;

	hcd = pci_get_drvdata(dev);
	if (!hcd)
		return;

	hcd_driver_flags = hcd->driver->flags;

	if (pci_dev_run_wake(dev))
		pm_runtime_get_noresume(&dev->dev);

	/* Fake an interrupt request in order to give the driver a chance
	 * to test whether the controller hardware has been removed (e.g.,
	 * cardbus physical eject).
	 */
	local_irq_disable();
	usb_hcd_irq(0, hcd);
	local_irq_enable();

	/* Note: dev_set_drvdata must be called while holding the rwsem */
	if (dev->class == CL_EHCI) {
		down_write(&companions_rwsem);
		for_each_companion(dev, hcd, ehci_remove);
		usb_remove_hcd(hcd);
		dev_set_drvdata(&dev->dev, NULL);
		up_write(&companions_rwsem);
	} else {
		/* Not EHCI; just clear the companion pointer */
		down_read(&companions_rwsem);
		hcd->self.hs_companion = NULL;
		usb_remove_hcd(hcd);
		dev_set_drvdata(&dev->dev, NULL);
		up_read(&companions_rwsem);
	}
	usb_put_hcd(hcd);
	if ((hcd_driver_flags & HCD_MASK) < HCD_USB3)
		pci_free_irq_vectors(dev);
	pci_disable_device(dev);
}
EXPORT_SYMBOL_GPL(usb_hcd_pci_remove);

/**
 * usb_hcd_pci_shutdown - shutdown host controller
 * @dev: USB Host Controller being shutdown
 */
void usb_hcd_pci_shutdown(struct pci_dev *dev)
{
	struct usb_hcd		*hcd;

	hcd = pci_get_drvdata(dev);
	if (!hcd)
		return;

	if (test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags) &&
			hcd->driver->shutdown) {
		hcd->driver->shutdown(hcd);
		if (usb_hcd_is_primary_hcd(hcd) && hcd->irq > 0)
			free_irq(hcd->irq, hcd);
		pci_disable_device(dev);
	}
}
EXPORT_SYMBOL_GPL(usb_hcd_pci_shutdown);

#ifdef	CONFIG_PM

#ifdef	CONFIG_PPC_PMAC
static void powermac_set_asic(struct pci_dev *pci_dev, int enable)
{
	/* Enanble or disable ASIC clocks for USB */
	if (machine_is(powermac)) {
		struct device_node	*of_node;

		of_node = pci_device_to_OF_node(pci_dev);
		if (of_node)
			pmac_call_feature(PMAC_FTR_USB_ENABLE,
					of_node, 0, enable);
	}
}

#else

static inline void powermac_set_asic(struct pci_dev *pci_dev, int enable)
{}

#endif	/* CONFIG_PPC_PMAC */

static int check_root_hub_suspended(struct device *dev)
{
	struct usb_hcd		*hcd = dev_get_drvdata(dev);

	if (HCD_RH_RUNNING(hcd)) {
		dev_warn(dev, "Root hub is not suspended\n");
		return -EBUSY;
	}
	if (hcd->shared_hcd) {
		hcd = hcd->shared_hcd;
		if (HCD_RH_RUNNING(hcd)) {
			dev_warn(dev, "Secondary root hub is not suspended\n");
			return -EBUSY;
		}
	}
	return 0;
}

static int suspend_common(struct device *dev, pm_message_t msg)
{
	struct pci_dev		*pci_dev = to_pci_dev(dev);
	struct usb_hcd		*hcd = pci_get_drvdata(pci_dev);
	bool			do_wakeup;
	int			retval;

	do_wakeup = PMSG_IS_AUTO(msg) ? true : device_may_wakeup(dev);

	/* Root hub suspend should have stopped all downstream traffic,
	 * and all bus master traffic.  And done so for both the interface
	 * and the stub usb_device (which we check here).  But maybe it
	 * didn't; writing sysfs power/state files ignores such rules...
	 */
	retval = check_root_hub_suspended(dev);
	if (retval)
		return retval;

	if (hcd->driver->pci_suspend && !HCD_DEAD(hcd)) {
		/* Optimization: Don't suspend if a root-hub wakeup is
		 * pending and it would cause the HCD to wake up anyway.
		 */
		if (do_wakeup && HCD_WAKEUP_PENDING(hcd))
			return -EBUSY;
		if (do_wakeup && hcd->shared_hcd &&
				HCD_WAKEUP_PENDING(hcd->shared_hcd))
			return -EBUSY;
		retval = hcd->driver->pci_suspend(hcd, do_wakeup);
		suspend_report_result(dev, hcd->driver->pci_suspend, retval);

		/* Check again in case wakeup raced with pci_suspend */
		if ((retval == 0 && do_wakeup && HCD_WAKEUP_PENDING(hcd)) ||
				(retval == 0 && do_wakeup && hcd->shared_hcd &&
				 HCD_WAKEUP_PENDING(hcd->shared_hcd))) {
			if (hcd->driver->pci_resume)
				hcd->driver->pci_resume(hcd, msg);
			retval = -EBUSY;
		}
		if (retval)
			return retval;
	}

	/* If MSI-X is enabled, the driver will have synchronized all vectors
	 * in pci_suspend(). If MSI or legacy PCI is enabled, that will be
	 * synchronized here.
	 */
	if (!hcd->msix_enabled)
		synchronize_irq(pci_irq_vector(pci_dev, 0));

	/* Downstream ports from this root hub should already be quiesced, so
	 * there will be no DMA activity.  Now we can shut down the upstream
	 * link (except maybe for PME# resume signaling).  We'll enter a
	 * low power state during suspend_noirq, if the hardware allows.
	 */
	pci_disable_device(pci_dev);
	return retval;
}

static int resume_common(struct device *dev, pm_message_t msg)
{
	struct pci_dev		*pci_dev = to_pci_dev(dev);
	struct usb_hcd		*hcd = pci_get_drvdata(pci_dev);
	int			retval;

	if (HCD_RH_RUNNING(hcd) ||
			(hcd->shared_hcd &&
			 HCD_RH_RUNNING(hcd->shared_hcd))) {
		dev_dbg(dev, "can't resume, not suspended!\n");
		return 0;
	}

	retval = pci_enable_device(pci_dev);
	if (retval < 0) {
		dev_err(dev, "can't re-enable after resume, %d!\n", retval);
		return retval;
	}

	pci_set_master(pci_dev);

	if (hcd->driver->pci_resume && !HCD_DEAD(hcd)) {

		/*
		 * Only EHCI controllers have to wait for their companions.
		 * No locking is needed because PCI controller drivers do not
		 * get unbound during system resume.
		 */
		if (pci_dev->class == CL_EHCI && msg.event != PM_EVENT_AUTO_RESUME)
			for_each_companion(pci_dev, hcd,
					ehci_wait_for_companions);

		retval = hcd->driver->pci_resume(hcd, msg);
		if (retval) {
			dev_err(dev, "PCI post-resume error %d!\n", retval);
			usb_hc_died(hcd);
		}
	}
	return retval;
}

#ifdef	CONFIG_PM_SLEEP

static int hcd_pci_suspend(struct device *dev)
{
	return suspend_common(dev, PMSG_SUSPEND);
}

static int hcd_pci_suspend_noirq(struct device *dev)
{
	struct pci_dev		*pci_dev = to_pci_dev(dev);
	struct usb_hcd		*hcd = pci_get_drvdata(pci_dev);
	int			retval;

	retval = check_root_hub_suspended(dev);
	if (retval)
		return retval;

	pci_save_state(pci_dev);

	/* If the root hub is dead rather than suspended, disallow remote
	 * wakeup.  usb_hc_died() should ensure that both hosts are marked as
	 * dying, so we only need to check the primary roothub.
	 */
	if (HCD_DEAD(hcd))
		device_set_wakeup_enable(dev, 0);
	dev_dbg(dev, "wakeup: %d\n", device_may_wakeup(dev));

	/* Possibly enable remote wakeup,
	 * choose the appropriate low-power state, and go to that state.
	 */
	retval = pci_prepare_to_sleep(pci_dev);
	if (retval == -EIO) {		/* Low-power not supported */
		dev_dbg(dev, "--> PCI D0 legacy\n");
		retval = 0;
	} else if (retval == 0) {
		dev_dbg(dev, "--> PCI %s\n",
				pci_power_name(pci_dev->current_state));
	} else {
		suspend_report_result(dev, pci_prepare_to_sleep, retval);
		return retval;
	}

	powermac_set_asic(pci_dev, 0);
	return retval;
}

static int hcd_pci_poweroff_late(struct device *dev)
{
	struct pci_dev		*pci_dev = to_pci_dev(dev);
	struct usb_hcd		*hcd = pci_get_drvdata(pci_dev);

	if (hcd->driver->pci_poweroff_late && !HCD_DEAD(hcd))
		return hcd->driver->pci_poweroff_late(hcd, device_may_wakeup(dev));

	return 0;
}

static int hcd_pci_resume_noirq(struct device *dev)
{
	powermac_set_asic(to_pci_dev(dev), 1);
	return 0;
}

static int hcd_pci_resume(struct device *dev)
{
	return resume_common(dev, PMSG_RESUME);
}

static int hcd_pci_restore(struct device *dev)
{
	return resume_common(dev, PMSG_RESTORE);
}

#else

#define hcd_pci_suspend		NULL
#define hcd_pci_suspend_noirq	NULL
#define hcd_pci_poweroff_late	NULL
#define hcd_pci_resume_noirq	NULL
#define hcd_pci_resume		NULL
#define hcd_pci_restore		NULL

#endif	/* CONFIG_PM_SLEEP */

static int hcd_pci_runtime_suspend(struct device *dev)
{
	int	retval;

	retval = suspend_common(dev, PMSG_AUTO_SUSPEND);
	if (retval == 0)
		powermac_set_asic(to_pci_dev(dev), 0);
	dev_dbg(dev, "hcd_pci_runtime_suspend: %d\n", retval);
	return retval;
}

static int hcd_pci_runtime_resume(struct device *dev)
{
	int	retval;

	powermac_set_asic(to_pci_dev(dev), 1);
	retval = resume_common(dev, PMSG_AUTO_RESUME);
	dev_dbg(dev, "hcd_pci_runtime_resume: %d\n", retval);
	return retval;
}

const struct dev_pm_ops usb_hcd_pci_pm_ops = {
	.suspend	= hcd_pci_suspend,
	.suspend_noirq	= hcd_pci_suspend_noirq,
	.resume_noirq	= hcd_pci_resume_noirq,
	.resume		= hcd_pci_resume,
	.freeze		= hcd_pci_suspend,
	.freeze_noirq	= check_root_hub_suspended,
	.thaw_noirq	= NULL,
	.thaw		= hcd_pci_resume,
	.poweroff	= hcd_pci_suspend,
	.poweroff_late	= hcd_pci_poweroff_late,
	.poweroff_noirq	= hcd_pci_suspend_noirq,
	.restore_noirq	= hcd_pci_resume_noirq,
	.restore	= hcd_pci_restore,
	.runtime_suspend = hcd_pci_runtime_suspend,
	.runtime_resume	= hcd_pci_runtime_resume,
};
EXPORT_SYMBOL_GPL(usb_hcd_pci_pm_ops);

#endif	/* CONFIG_PM */