drivers/usb/core/hcd-pci.c

   1 /*
   2  * (C) Copyright David Brownell 2000-2002
   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 #include <linux/kernel.h>
  20 #include <linux/module.h>
  21 #include <linux/pci.h>
  22 #include <linux/usb.h>
  23 #include <linux/usb/hcd.h>
  24
  25 #include <asm/io.h>
  26 #include <asm/irq.h>
  27
  28 #ifdef CONFIG_PPC_PMAC
  29 #include <asm/machdep.h>
  30 #include <asm/pmac_feature.h>
  31 #include <asm/pci-bridge.h>
  32 #include <asm/prom.h>
  33 #endif
  34
  35 #include "usb.h"
  36
  37
  38 /* PCI-based HCs are common, but plenty of non-PCI HCs are used too */
  39
  40 /*
  41  * Coordinate handoffs between EHCI and companion controllers
  42  * during EHCI probing and system resume.
  43  */
  44
  45 static DECLARE_RWSEM(companions_rwsem);
  46
  47 #define CL_UHCI         PCI_CLASS_SERIAL_USB_UHCI
  48 #define CL_OHCI         PCI_CLASS_SERIAL_USB_OHCI
  49 #define CL_EHCI         PCI_CLASS_SERIAL_USB_EHCI
  50
  51 static inline int is_ohci_or_uhci(struct pci_dev *pdev)
  52 {
  53         return pdev->class == CL_OHCI || pdev->class == CL_UHCI;
  54 }
  55
  56 typedef void (*companion_fn)(struct pci_dev *pdev, struct usb_hcd *hcd,
  57                 struct pci_dev *companion, struct usb_hcd *companion_hcd);
  58
  59 /* Iterate over PCI devices in the same slot as pdev and call fn for each */
  60 static void for_each_companion(struct pci_dev *pdev, struct usb_hcd *hcd,
  61                 companion_fn fn)
  62 {
  63         struct pci_dev          *companion;
  64         struct usb_hcd          *companion_hcd;
  65         unsigned int            slot = PCI_SLOT(pdev->devfn);
  66
  67         /*
  68          * Iterate through other PCI functions in the same slot.
  69          * If the function's drvdata isn't set then it isn't bound to
  70          * a USB host controller driver, so skip it.
  71          */
  72         companion = NULL;
  73         for_each_pci_dev(companion) {
  74                 if (companion->bus != pdev->bus ||
  75                                 PCI_SLOT(companion->devfn) != slot)
  76                         continue;
  77                 companion_hcd = pci_get_drvdata(companion);
  78                 if (!companion_hcd || !companion_hcd->self.root_hub)
  79                         continue;
  80                 fn(pdev, hcd, companion, companion_hcd);
  81         }
  82 }
  83
  84 /*
  85  * We're about to add an EHCI controller, which will unceremoniously grab
  86  * all the port connections away from its companions.  To prevent annoying
  87  * error messages, lock the companion's root hub and gracefully unconfigure
  88  * it beforehand.  Leave it locked until the EHCI controller is all set.
  89  */
  90 static void ehci_pre_add(struct pci_dev *pdev, struct usb_hcd *hcd,
  91                 struct pci_dev *companion, struct usb_hcd *companion_hcd)
  92 {
  93         struct usb_device *udev;
  94
  95         if (is_ohci_or_uhci(companion)) {
  96                 udev = companion_hcd->self.root_hub;
  97                 usb_lock_device(udev);
  98                 usb_set_configuration(udev, 0);
  99         }
 100 }
 101
 102 /*
 103  * Adding the EHCI controller has either succeeded or failed.  Set the
 104  * companion pointer accordingly, and in either case, reconfigure and
 105  * unlock the root hub.
 106  */
 107 static void ehci_post_add(struct pci_dev *pdev, struct usb_hcd *hcd,
 108                 struct pci_dev *companion, struct usb_hcd *companion_hcd)
 109 {
 110         struct usb_device *udev;
 111
 112         if (is_ohci_or_uhci(companion)) {
 113                 if (dev_get_drvdata(&pdev->dev)) {      /* Succeeded */
 114                         dev_dbg(&pdev->dev, "HS companion for %s\n",
 115                                         dev_name(&companion->dev));
 116                         companion_hcd->self.hs_companion = &hcd->self;
 117                 }
 118                 udev = companion_hcd->self.root_hub;
 119                 usb_set_configuration(udev, 1);
 120                 usb_unlock_device(udev);
 121         }
 122 }
 123
 124 /*
 125  * We just added a non-EHCI controller.  Find the EHCI controller to
 126  * which it is a companion, and store a pointer to the bus structure.
 127  */
 128 static void non_ehci_add(struct pci_dev *pdev, struct usb_hcd *hcd,
 129                 struct pci_dev *companion, struct usb_hcd *companion_hcd)
 130 {
 131         if (is_ohci_or_uhci(pdev) && companion->class == CL_EHCI) {
 132                 dev_dbg(&pdev->dev, "FS/LS companion for %s\n",
 133                                 dev_name(&companion->dev));
 134                 hcd->self.hs_companion = &companion_hcd->self;
 135         }
 136 }
 137
 138 /* We are removing an EHCI controller.  Clear the companions' pointers. */
 139 static void ehci_remove(struct pci_dev *pdev, struct usb_hcd *hcd,
 140                 struct pci_dev *companion, struct usb_hcd *companion_hcd)
 141 {
 142         if (is_ohci_or_uhci(companion))
 143                 companion_hcd->self.hs_companion = NULL;
 144 }
 145
 146 #ifdef  CONFIG_PM
 147
 148 /* An EHCI controller must wait for its companions before resuming. */
 149 static void ehci_wait_for_companions(struct pci_dev *pdev, struct usb_hcd *hcd,
 150                 struct pci_dev *companion, struct usb_hcd *companion_hcd)
 151 {
 152         if (is_ohci_or_uhci(companion))
 153                 device_pm_wait_for_dev(&pdev->dev, &companion->dev);
 154 }
 155
 156 #endif  /* CONFIG_PM */
 157
 158 /*-------------------------------------------------------------------------*/
 159
 160 /* configure so an HC device and id are always provided */
 161 /* always called with process context; sleeping is OK */
 162
 163 /**
 164  * usb_hcd_pci_probe - initialize PCI-based HCDs
 165  * @dev: USB Host Controller being probed
 166  * @id: pci hotplug id connecting controller to HCD framework
 167  * Context: !in_interrupt()
 168  *
 169  * Allocates basic PCI resources for this USB host controller, and
 170  * then invokes the start() method for the HCD associated with it
 171  * through the hotplug entry's driver_data.
 172  *
 173  * Store this function in the HCD's struct pci_driver as probe().
 174  *
 175  * Return: 0 if successful.
 176  */
 177 int usb_hcd_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
 178 {
 179         struct hc_driver        *driver;
 180         struct usb_hcd          *hcd;
 181         int                     retval;
 182         int                     hcd_irq = 0;
 183
 184         if (usb_disabled())
 185                 return -ENODEV;
 186
 187         if (!id)
 188                 return -EINVAL;
 189         driver = (struct hc_driver *)id->driver_data;
 190         if (!driver)
 191                 return -EINVAL;
 192
 193         if (pci_enable_device(dev) < 0)
 194                 return -ENODEV;
 195         dev->current_state = PCI_D0;
 196
 197         /*
 198          * The xHCI driver has its own irq management
 199          * make sure irq setup is not touched for xhci in generic hcd code
 200          */
 201         if ((driver->flags & HCD_MASK) != HCD_USB3) {
 202                 if (!dev->irq) {
 203                         dev_err(&dev->dev,
 204                         "Found HC with no IRQ. Check BIOS/PCI %s setup!\n",
 205                                 pci_name(dev));
 206                         retval = -ENODEV;
 207                         goto disable_pci;
 208                 }
 209                 hcd_irq = dev->irq;
 210         }
 211
 212         hcd = usb_create_hcd(driver, &dev->dev, pci_name(dev));
 213         if (!hcd) {
 214                 retval = -ENOMEM;
 215                 goto disable_pci;
 216         }
 217
 218         hcd->amd_resume_bug = (usb_hcd_amd_remote_wakeup_quirk(dev) &&
 219                         driver->flags & (HCD_USB11 | HCD_USB3)) ? 1 : 0;
 220
 221         if (driver->flags & HCD_MEMORY) {
 222                 /* EHCI, OHCI */
 223                 hcd->rsrc_start = pci_resource_start(dev, 0);
 224                 hcd->rsrc_len = pci_resource_len(dev, 0);
 225                 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
 226                                 driver->description)) {
 227                         dev_dbg(&dev->dev, "controller already in use\n");
 228                         retval = -EBUSY;
 229                         goto put_hcd;
 230                 }
 231                 hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
 232                 if (hcd->regs == NULL) {
 233                         dev_dbg(&dev->dev, "error mapping memory\n");
 234                         retval = -EFAULT;
 235                         goto release_mem_region;
 236                 }
 237
 238         } else {
 239                 /* UHCI */
 240                 int     region;
 241
 242                 for (region = 0; region < PCI_ROM_RESOURCE; region++) {
 243                         if (!(pci_resource_flags(dev, region) &
 244                                         IORESOURCE_IO))
 245                                 continue;
 246
 247                         hcd->rsrc_start = pci_resource_start(dev, region);
 248                         hcd->rsrc_len = pci_resource_len(dev, region);
 249                         if (request_region(hcd->rsrc_start, hcd->rsrc_len,
 250                                         driver->description))
 251                                 break;
 252                 }
 253                 if (region == PCI_ROM_RESOURCE) {
 254                         dev_dbg(&dev->dev, "no i/o regions available\n");
 255                         retval = -EBUSY;
 256                         goto put_hcd;
 257                 }
 258         }
 259
 260         pci_set_master(dev);
 261
 262         /* Note: dev_set_drvdata must be called while holding the rwsem */
 263         if (dev->class == CL_EHCI) {
 264                 down_write(&companions_rwsem);
 265                 dev_set_drvdata(&dev->dev, hcd);
 266                 for_each_companion(dev, hcd, ehci_pre_add);
 267                 retval = usb_add_hcd(hcd, hcd_irq, IRQF_SHARED);
 268                 if (retval != 0)
 269                         dev_set_drvdata(&dev->dev, NULL);
 270                 for_each_companion(dev, hcd, ehci_post_add);
 271                 up_write(&companions_rwsem);
 272         } else {
 273                 down_read(&companions_rwsem);
 274                 dev_set_drvdata(&dev->dev, hcd);
 275                 retval = usb_add_hcd(hcd, hcd_irq, IRQF_SHARED);
 276                 if (retval != 0)
 277                         dev_set_drvdata(&dev->dev, NULL);
 278                 else
 279                         for_each_companion(dev, hcd, non_ehci_add);
 280                 up_read(&companions_rwsem);
 281         }
 282
 283         if (retval != 0)
 284                 goto unmap_registers;
 285         device_wakeup_enable(hcd->self.controller);
 286
 287         if (pci_dev_run_wake(dev))
 288                 pm_runtime_put_noidle(&dev->dev);
 289         return retval;
 290
 291 unmap_registers:
 292         if (driver->flags & HCD_MEMORY) {
 293                 iounmap(hcd->regs);
 294 release_mem_region:
 295                 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 296         } else
 297                 release_region(hcd->rsrc_start, hcd->rsrc_len);
 298 put_hcd:
 299         usb_put_hcd(hcd);
 300 disable_pci:
 301         pci_disable_device(dev);
 302         dev_err(&dev->dev, "init %s fail, %d\n", pci_name(dev), retval);
 303         return retval;
 304 }
 305 EXPORT_SYMBOL_GPL(usb_hcd_pci_probe);
 306
 307
 308 /* may be called without controller electrically present */
 309 /* may be called with controller, bus, and devices active */
 310
 311 /**
 312  * usb_hcd_pci_remove - shutdown processing for PCI-based HCDs
 313  * @dev: USB Host Controller being removed
 314  * Context: !in_interrupt()
 315  *
 316  * Reverses the effect of usb_hcd_pci_probe(), first invoking
 317  * the HCD's stop() method.  It is always called from a thread
 318  * context, normally "rmmod", "apmd", or something similar.
 319  *
 320  * Store this function in the HCD's struct pci_driver as remove().
 321  */
 322 void usb_hcd_pci_remove(struct pci_dev *dev)
 323 {
 324         struct usb_hcd          *hcd;
 325
 326         hcd = pci_get_drvdata(dev);
 327         if (!hcd)
 328                 return;
 329
 330         if (pci_dev_run_wake(dev))
 331                 pm_runtime_get_noresume(&dev->dev);
 332
 333         /* Fake an interrupt request in order to give the driver a chance
 334          * to test whether the controller hardware has been removed (e.g.,
 335          * cardbus physical eject).
 336          */
 337         local_irq_disable();
 338         usb_hcd_irq(0, hcd);
 339         local_irq_enable();
 340
 341         /* Note: dev_set_drvdata must be called while holding the rwsem */
 342         if (dev->class == CL_EHCI) {
 343                 down_write(&companions_rwsem);
 344                 for_each_companion(dev, hcd, ehci_remove);
 345                 usb_remove_hcd(hcd);
 346                 dev_set_drvdata(&dev->dev, NULL);
 347                 up_write(&companions_rwsem);
 348         } else {
 349                 /* Not EHCI; just clear the companion pointer */
 350                 down_read(&companions_rwsem);
 351                 hcd->self.hs_companion = NULL;
 352                 usb_remove_hcd(hcd);
 353                 dev_set_drvdata(&dev->dev, NULL);
 354                 up_read(&companions_rwsem);
 355         }
 356
 357         if (hcd->driver->flags & HCD_MEMORY) {
 358                 iounmap(hcd->regs);
 359                 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 360         } else {
 361                 release_region(hcd->rsrc_start, hcd->rsrc_len);
 362         }
 363
 364         usb_put_hcd(hcd);
 365         pci_disable_device(dev);
 366 }
 367 EXPORT_SYMBOL_GPL(usb_hcd_pci_remove);
 368
 369 /**
 370  * usb_hcd_pci_shutdown - shutdown host controller
 371  * @dev: USB Host Controller being shutdown
 372  */
 373 void usb_hcd_pci_shutdown(struct pci_dev *dev)
 374 {
 375         struct usb_hcd          *hcd;
 376
 377         hcd = pci_get_drvdata(dev);
 378         if (!hcd)
 379                 return;
 380
 381         if (test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags) &&
 382                         hcd->driver->shutdown) {
 383                 hcd->driver->shutdown(hcd);
 384                 pci_disable_device(dev);
 385         }
 386 }
 387 EXPORT_SYMBOL_GPL(usb_hcd_pci_shutdown);
 388
 389 #ifdef  CONFIG_PM
 390
 391 #ifdef  CONFIG_PPC_PMAC
 392 static void powermac_set_asic(struct pci_dev *pci_dev, int enable)
 393 {
 394         /* Enanble or disable ASIC clocks for USB */
 395         if (machine_is(powermac)) {
 396                 struct device_node      *of_node;
 397
 398                 of_node = pci_device_to_OF_node(pci_dev);
 399                 if (of_node)
 400                         pmac_call_feature(PMAC_FTR_USB_ENABLE,
 401                                         of_node, 0, enable);
 402         }
 403 }
 404
 405 #else
 406
 407 static inline void powermac_set_asic(struct pci_dev *pci_dev, int enable)
 408 {}
 409
 410 #endif  /* CONFIG_PPC_PMAC */
 411
 412 static int check_root_hub_suspended(struct device *dev)
 413 {
 414         struct pci_dev          *pci_dev = to_pci_dev(dev);
 415         struct usb_hcd          *hcd = pci_get_drvdata(pci_dev);
 416
 417         if (HCD_RH_RUNNING(hcd)) {
 418                 dev_warn(dev, "Root hub is not suspended\n");
 419                 return -EBUSY;
 420         }
 421         if (hcd->shared_hcd) {
 422                 hcd = hcd->shared_hcd;
 423                 if (HCD_RH_RUNNING(hcd)) {
 424                         dev_warn(dev, "Secondary root hub is not suspended\n");
 425                         return -EBUSY;
 426                 }
 427         }
 428         return 0;
 429 }
 430
 431 #if defined(CONFIG_PM_SLEEP) || defined(CONFIG_PM_RUNTIME)
 432 static int suspend_common(struct device *dev, bool do_wakeup)
 433 {
 434         struct pci_dev          *pci_dev = to_pci_dev(dev);
 435         struct usb_hcd          *hcd = pci_get_drvdata(pci_dev);
 436         int                     retval;
 437
 438         /* Root hub suspend should have stopped all downstream traffic,
 439          * and all bus master traffic.  And done so for both the interface
 440          * and the stub usb_device (which we check here).  But maybe it
 441          * didn't; writing sysfs power/state files ignores such rules...
 442          */
 443         retval = check_root_hub_suspended(dev);
 444         if (retval)
 445                 return retval;
 446
 447         if (hcd->driver->pci_suspend && !HCD_DEAD(hcd)) {
 448                 /* Optimization: Don't suspend if a root-hub wakeup is
 449                  * pending and it would cause the HCD to wake up anyway.
 450                  */
 451                 if (do_wakeup && HCD_WAKEUP_PENDING(hcd))
 452                         return -EBUSY;
 453                 if (do_wakeup && hcd->shared_hcd &&
 454                                 HCD_WAKEUP_PENDING(hcd->shared_hcd))
 455                         return -EBUSY;
 456                 retval = hcd->driver->pci_suspend(hcd, do_wakeup);
 457                 suspend_report_result(hcd->driver->pci_suspend, retval);
 458
 459                 /* Check again in case wakeup raced with pci_suspend */
 460                 if ((retval == 0 && do_wakeup && HCD_WAKEUP_PENDING(hcd)) ||
 461                                 (retval == 0 && do_wakeup && hcd->shared_hcd &&
 462                                  HCD_WAKEUP_PENDING(hcd->shared_hcd))) {
 463                         if (hcd->driver->pci_resume)
 464                                 hcd->driver->pci_resume(hcd, false);
 465                         retval = -EBUSY;
 466                 }
 467                 if (retval)
 468                         return retval;
 469         }
 470
 471         /* If MSI-X is enabled, the driver will have synchronized all vectors
 472          * in pci_suspend(). If MSI or legacy PCI is enabled, that will be
 473          * synchronized here.
 474          */
 475         if (!hcd->msix_enabled)
 476                 synchronize_irq(pci_dev->irq);
 477
 478         /* Downstream ports from this root hub should already be quiesced, so
 479          * there will be no DMA activity.  Now we can shut down the upstream
 480          * link (except maybe for PME# resume signaling).  We'll enter a
 481          * low power state during suspend_noirq, if the hardware allows.
 482          */
 483         pci_disable_device(pci_dev);
 484         return retval;
 485 }
 486
 487 static int resume_common(struct device *dev, int event)
 488 {
 489         struct pci_dev          *pci_dev = to_pci_dev(dev);
 490         struct usb_hcd          *hcd = pci_get_drvdata(pci_dev);
 491         int                     retval;
 492
 493         if (HCD_RH_RUNNING(hcd) ||
 494                         (hcd->shared_hcd &&
 495                          HCD_RH_RUNNING(hcd->shared_hcd))) {
 496                 dev_dbg(dev, "can't resume, not suspended!\n");
 497                 return 0;
 498         }
 499
 500         retval = pci_enable_device(pci_dev);
 501         if (retval < 0) {
 502                 dev_err(dev, "can't re-enable after resume, %d!\n", retval);
 503                 return retval;
 504         }
 505
 506         pci_set_master(pci_dev);
 507
 508         if (hcd->driver->pci_resume && !HCD_DEAD(hcd)) {
 509
 510                 /*
 511                  * Only EHCI controllers have to wait for their companions.
 512                  * No locking is needed because PCI controller drivers do not
 513                  * get unbound during system resume.
 514                  */
 515                 if (pci_dev->class == CL_EHCI && event != PM_EVENT_AUTO_RESUME)
 516                         for_each_companion(pci_dev, hcd,
 517                                         ehci_wait_for_companions);
 518
 519                 retval = hcd->driver->pci_resume(hcd,
 520                                 event == PM_EVENT_RESTORE);
 521                 if (retval) {
 522                         dev_err(dev, "PCI post-resume error %d!\n", retval);
 523                         if (hcd->shared_hcd)
 524                                 usb_hc_died(hcd->shared_hcd);
 525                         usb_hc_died(hcd);
 526                 }
 527         }
 528         return retval;
 529 }
 530 #endif  /* SLEEP || RUNTIME */
 531
 532 #ifdef  CONFIG_PM_SLEEP
 533
 534 static int hcd_pci_suspend(struct device *dev)
 535 {
 536         return suspend_common(dev, device_may_wakeup(dev));
 537 }
 538
 539 static int hcd_pci_suspend_noirq(struct device *dev)
 540 {
 541         struct pci_dev          *pci_dev = to_pci_dev(dev);
 542         struct usb_hcd          *hcd = pci_get_drvdata(pci_dev);
 543         int                     retval;
 544
 545         retval = check_root_hub_suspended(dev);
 546         if (retval)
 547                 return retval;
 548
 549         pci_save_state(pci_dev);
 550
 551         /* If the root hub is dead rather than suspended, disallow remote
 552          * wakeup.  usb_hc_died() should ensure that both hosts are marked as
 553          * dying, so we only need to check the primary roothub.
 554          */
 555         if (HCD_DEAD(hcd))
 556                 device_set_wakeup_enable(dev, 0);
 557         dev_dbg(dev, "wakeup: %d\n", device_may_wakeup(dev));
 558
 559         /* Possibly enable remote wakeup,
 560          * choose the appropriate low-power state, and go to that state.
 561          */
 562         retval = pci_prepare_to_sleep(pci_dev);
 563         if (retval == -EIO) {           /* Low-power not supported */
 564                 dev_dbg(dev, "--> PCI D0 legacy\n");
 565                 retval = 0;
 566         } else if (retval == 0) {
 567                 dev_dbg(dev, "--> PCI %s\n",
 568                                 pci_power_name(pci_dev->current_state));
 569         } else {
 570                 suspend_report_result(pci_prepare_to_sleep, retval);
 571                 return retval;
 572         }
 573
 574         powermac_set_asic(pci_dev, 0);
 575         return retval;
 576 }
 577
 578 static int hcd_pci_resume_noirq(struct device *dev)
 579 {
 580         struct pci_dev          *pci_dev = to_pci_dev(dev);
 581
 582         powermac_set_asic(pci_dev, 1);
 583
 584         /* Go back to D0 and disable remote wakeup */
 585         pci_back_from_sleep(pci_dev);
 586         return 0;
 587 }
 588
 589 static int hcd_pci_resume(struct device *dev)
 590 {
 591         return resume_common(dev, PM_EVENT_RESUME);
 592 }
 593
 594 static int hcd_pci_restore(struct device *dev)
 595 {
 596         return resume_common(dev, PM_EVENT_RESTORE);
 597 }
 598
 599 #else
 600
 601 #define hcd_pci_suspend         NULL
 602 #define hcd_pci_suspend_noirq   NULL
 603 #define hcd_pci_resume_noirq    NULL
 604 #define hcd_pci_resume          NULL
 605 #define hcd_pci_restore         NULL
 606
 607 #endif  /* CONFIG_PM_SLEEP */
 608
 609 #ifdef  CONFIG_PM_RUNTIME
 610
 611 static int hcd_pci_runtime_suspend(struct device *dev)
 612 {
 613         int     retval;
 614
 615         retval = suspend_common(dev, true);
 616         if (retval == 0)
 617                 powermac_set_asic(to_pci_dev(dev), 0);
 618         dev_dbg(dev, "hcd_pci_runtime_suspend: %d\n", retval);
 619         return retval;
 620 }
 621
 622 static int hcd_pci_runtime_resume(struct device *dev)
 623 {
 624         int     retval;
 625
 626         powermac_set_asic(to_pci_dev(dev), 1);
 627         retval = resume_common(dev, PM_EVENT_AUTO_RESUME);
 628         dev_dbg(dev, "hcd_pci_runtime_resume: %d\n", retval);
 629         return retval;
 630 }
 631
 632 #else
 633
 634 #define hcd_pci_runtime_suspend NULL
 635 #define hcd_pci_runtime_resume  NULL
 636
 637 #endif  /* CONFIG_PM_RUNTIME */
 638
 639 const struct dev_pm_ops usb_hcd_pci_pm_ops = {
 640         .suspend        = hcd_pci_suspend,
 641         .suspend_noirq  = hcd_pci_suspend_noirq,
 642         .resume_noirq   = hcd_pci_resume_noirq,
 643         .resume         = hcd_pci_resume,
 644         .freeze         = check_root_hub_suspended,
 645         .freeze_noirq   = check_root_hub_suspended,
 646         .thaw_noirq     = NULL,
 647         .thaw           = NULL,
 648         .poweroff       = hcd_pci_suspend,
 649         .poweroff_noirq = hcd_pci_suspend_noirq,
 650         .restore_noirq  = hcd_pci_resume_noirq,
 651         .restore        = hcd_pci_restore,
 652         .runtime_suspend = hcd_pci_runtime_suspend,
 653         .runtime_resume = hcd_pci_runtime_resume,
 654 };
 655 EXPORT_SYMBOL_GPL(usb_hcd_pci_pm_ops);
 656
 657 #endif  /* CONFIG_PM */