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/pm_runtime.h>
  23 #include <linux/usb.h>
  24 #include <linux/usb/hcd.h>
  25
  26 #include <asm/io.h>
  27 #include <asm/irq.h>
  28
  29 #ifdef CONFIG_PPC_PMAC
  30 #include <asm/machdep.h>
  31 #include <asm/pmac_feature.h>
  32 #include <asm/pci-bridge.h>
  33 #include <asm/prom.h>
  34 #endif
  35
  36 #include "usb.h"
  37
  38
  39 /* PCI-based HCs are common, but plenty of non-PCI HCs are used too */
  40
  41 #ifdef CONFIG_PM_SLEEP
  42
  43 /* Coordinate handoffs between EHCI and companion controllers
  44  * during system resume
  45  */
  46
  47 static DEFINE_MUTEX(companions_mutex);
  48
  49 #define CL_UHCI         PCI_CLASS_SERIAL_USB_UHCI
  50 #define CL_OHCI         PCI_CLASS_SERIAL_USB_OHCI
  51 #define CL_EHCI         PCI_CLASS_SERIAL_USB_EHCI
  52
  53 enum companion_action {
  54         SET_HS_COMPANION, CLEAR_HS_COMPANION, WAIT_FOR_COMPANIONS
  55 };
  56
  57 static void companion_common(struct pci_dev *pdev, struct usb_hcd *hcd,
  58                 enum companion_action action)
  59 {
  60         struct pci_dev          *companion;
  61         struct usb_hcd          *companion_hcd;
  62         unsigned int            slot = PCI_SLOT(pdev->devfn);
  63
  64         /* Iterate through other PCI functions in the same slot.
  65          * If pdev is OHCI or UHCI then we are looking for EHCI, and
  66          * vice versa.
  67          */
  68         companion = NULL;
  69         for_each_pci_dev(companion) {
  70                 if (companion->bus != pdev->bus ||
  71                                 PCI_SLOT(companion->devfn) != slot)
  72                         continue;
  73
  74                 companion_hcd = pci_get_drvdata(companion);
  75                 if (!companion_hcd)
  76                         continue;
  77
  78                 /* For SET_HS_COMPANION, store a pointer to the EHCI bus in
  79                  * the OHCI/UHCI companion bus structure.
  80                  * For CLEAR_HS_COMPANION, clear the pointer to the EHCI bus
  81                  * in the OHCI/UHCI companion bus structure.
  82                  * For WAIT_FOR_COMPANIONS, wait until the OHCI/UHCI
  83                  * companion controllers have fully resumed.
  84                  */
  85
  86                 if ((pdev->class == CL_OHCI || pdev->class == CL_UHCI) &&
  87                                 companion->class == CL_EHCI) {
  88                         /* action must be SET_HS_COMPANION */
  89                         dev_dbg(&companion->dev, "HS companion for %s\n",
  90                                         dev_name(&pdev->dev));
  91                         hcd->self.hs_companion = &companion_hcd->self;
  92
  93                 } else if (pdev->class == CL_EHCI &&
  94                                 (companion->class == CL_OHCI ||
  95                                 companion->class == CL_UHCI)) {
  96                         switch (action) {
  97                         case SET_HS_COMPANION:
  98                                 dev_dbg(&pdev->dev, "HS companion for %s\n",
  99                                                 dev_name(&companion->dev));
 100                                 companion_hcd->self.hs_companion = &hcd->self;
 101                                 break;
 102                         case CLEAR_HS_COMPANION:
 103                                 companion_hcd->self.hs_companion = NULL;
 104                                 break;
 105                         case WAIT_FOR_COMPANIONS:
 106                                 device_pm_wait_for_dev(&pdev->dev,
 107                                                 &companion->dev);
 108                                 break;
 109                         }
 110                 }
 111         }
 112 }
 113
 114 static void set_hs_companion(struct pci_dev *pdev, struct usb_hcd *hcd)
 115 {
 116         mutex_lock(&companions_mutex);
 117         dev_set_drvdata(&pdev->dev, hcd);
 118         companion_common(pdev, hcd, SET_HS_COMPANION);
 119         mutex_unlock(&companions_mutex);
 120 }
 121
 122 static void clear_hs_companion(struct pci_dev *pdev, struct usb_hcd *hcd)
 123 {
 124         mutex_lock(&companions_mutex);
 125         dev_set_drvdata(&pdev->dev, NULL);
 126
 127         /* If pdev is OHCI or UHCI, just clear its hs_companion pointer */
 128         if (pdev->class == CL_OHCI || pdev->class == CL_UHCI)
 129                 hcd->self.hs_companion = NULL;
 130
 131         /* Otherwise search for companion buses and clear their pointers */
 132         else
 133                 companion_common(pdev, hcd, CLEAR_HS_COMPANION);
 134         mutex_unlock(&companions_mutex);
 135 }
 136
 137 static void wait_for_companions(struct pci_dev *pdev, struct usb_hcd *hcd)
 138 {
 139         /* Only EHCI controllers need to wait.
 140          * No locking is needed because a controller cannot be resumed
 141          * while one of its companions is getting unbound.
 142          */
 143         if (pdev->class == CL_EHCI)
 144                 companion_common(pdev, hcd, WAIT_FOR_COMPANIONS);
 145 }
 146
 147 #else /* !CONFIG_PM_SLEEP */
 148
 149 static inline void set_hs_companion(struct pci_dev *d, struct usb_hcd *h) {}
 150 static inline void clear_hs_companion(struct pci_dev *d, struct usb_hcd *h) {}
 151 static inline void wait_for_companions(struct pci_dev *d, struct usb_hcd *h) {}
 152
 153 #endif /* !CONFIG_PM_SLEEP */
 154
 155 /*-------------------------------------------------------------------------*/
 156
 157 /* configure so an HC device and id are always provided */
 158 /* always called with process context; sleeping is OK */
 159
 160 /**
 161  * usb_hcd_pci_probe - initialize PCI-based HCDs
 162  * @dev: USB Host Controller being probed
 163  * @id: pci hotplug id connecting controller to HCD framework
 164  * Context: !in_interrupt()
 165  *
 166  * Allocates basic PCI resources for this USB host controller, and
 167  * then invokes the start() method for the HCD associated with it
 168  * through the hotplug entry's driver_data.
 169  *
 170  * Store this function in the HCD's struct pci_driver as probe().
 171  */
 172 int usb_hcd_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
 173 {
 174         struct hc_driver        *driver;
 175         struct usb_hcd          *hcd;
 176         int                     retval;
 177
 178         if (usb_disabled())
 179                 return -ENODEV;
 180
 181         if (!id)
 182                 return -EINVAL;
 183         driver = (struct hc_driver *)id->driver_data;
 184         if (!driver)
 185                 return -EINVAL;
 186
 187         if (pci_enable_device(dev) < 0)
 188                 return -ENODEV;
 189         dev->current_state = PCI_D0;
 190
 191         if (!dev->irq) {
 192                 dev_err(&dev->dev,
 193                         "Found HC with no IRQ.  Check BIOS/PCI %s setup!\n",
 194                         pci_name(dev));
 195                 retval = -ENODEV;
 196                 goto err1;
 197         }
 198
 199         hcd = usb_create_hcd(driver, &dev->dev, pci_name(dev));
 200         if (!hcd) {
 201                 retval = -ENOMEM;
 202                 goto err1;
 203         }
 204
 205         if (driver->flags & HCD_MEMORY) {
 206                 /* EHCI, OHCI */
 207                 hcd->rsrc_start = pci_resource_start(dev, 0);
 208                 hcd->rsrc_len = pci_resource_len(dev, 0);
 209                 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
 210                                 driver->description)) {
 211                         dev_dbg(&dev->dev, "controller already in use\n");
 212                         retval = -EBUSY;
 213                         goto err2;
 214                 }
 215                 hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
 216                 if (hcd->regs == NULL) {
 217                         dev_dbg(&dev->dev, "error mapping memory\n");
 218                         retval = -EFAULT;
 219                         goto err3;
 220                 }
 221
 222         } else {
 223                 /* UHCI */
 224                 int     region;
 225
 226                 for (region = 0; region < PCI_ROM_RESOURCE; region++) {
 227                         if (!(pci_resource_flags(dev, region) &
 228                                         IORESOURCE_IO))
 229                                 continue;
 230
 231                         hcd->rsrc_start = pci_resource_start(dev, region);
 232                         hcd->rsrc_len = pci_resource_len(dev, region);
 233                         if (request_region(hcd->rsrc_start, hcd->rsrc_len,
 234                                         driver->description))
 235                                 break;
 236                 }
 237                 if (region == PCI_ROM_RESOURCE) {
 238                         dev_dbg(&dev->dev, "no i/o regions available\n");
 239                         retval = -EBUSY;
 240                         goto err2;
 241                 }
 242         }
 243
 244         pci_set_master(dev);
 245
 246         retval = usb_add_hcd(hcd, dev->irq, IRQF_DISABLED | IRQF_SHARED);
 247         if (retval != 0)
 248                 goto err4;
 249         set_hs_companion(dev, hcd);
 250
 251         if (pci_dev_run_wake(dev))
 252                 pm_runtime_put_noidle(&dev->dev);
 253         return retval;
 254
 255  err4:
 256         if (driver->flags & HCD_MEMORY) {
 257                 iounmap(hcd->regs);
 258  err3:
 259                 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 260         } else
 261                 release_region(hcd->rsrc_start, hcd->rsrc_len);
 262  err2:
 263         clear_hs_companion(dev, hcd);
 264         usb_put_hcd(hcd);
 265  err1:
 266         pci_disable_device(dev);
 267         dev_err(&dev->dev, "init %s fail, %d\n", pci_name(dev), retval);
 268         return retval;
 269 }
 270 EXPORT_SYMBOL_GPL(usb_hcd_pci_probe);
 271
 272
 273 /* may be called without controller electrically present */
 274 /* may be called with controller, bus, and devices active */
 275
 276 /**
 277  * usb_hcd_pci_remove - shutdown processing for PCI-based HCDs
 278  * @dev: USB Host Controller being removed
 279  * Context: !in_interrupt()
 280  *
 281  * Reverses the effect of usb_hcd_pci_probe(), first invoking
 282  * the HCD's stop() method.  It is always called from a thread
 283  * context, normally "rmmod", "apmd", or something similar.
 284  *
 285  * Store this function in the HCD's struct pci_driver as remove().
 286  */
 287 void usb_hcd_pci_remove(struct pci_dev *dev)
 288 {
 289         struct usb_hcd          *hcd;
 290
 291         hcd = pci_get_drvdata(dev);
 292         if (!hcd)
 293                 return;
 294
 295         if (pci_dev_run_wake(dev))
 296                 pm_runtime_get_noresume(&dev->dev);
 297
 298         /* Fake an interrupt request in order to give the driver a chance
 299          * to test whether the controller hardware has been removed (e.g.,
 300          * cardbus physical eject).
 301          */
 302         local_irq_disable();
 303         usb_hcd_irq(0, hcd);
 304         local_irq_enable();
 305
 306         usb_remove_hcd(hcd);
 307         if (hcd->driver->flags & HCD_MEMORY) {
 308                 iounmap(hcd->regs);
 309                 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 310         } else {
 311                 release_region(hcd->rsrc_start, hcd->rsrc_len);
 312         }
 313         clear_hs_companion(dev, hcd);
 314         usb_put_hcd(hcd);
 315         pci_disable_device(dev);
 316 }
 317 EXPORT_SYMBOL_GPL(usb_hcd_pci_remove);
 318
 319 /**
 320  * usb_hcd_pci_shutdown - shutdown host controller
 321  * @dev: USB Host Controller being shutdown
 322  */
 323 void usb_hcd_pci_shutdown(struct pci_dev *dev)
 324 {
 325         struct usb_hcd          *hcd;
 326
 327         hcd = pci_get_drvdata(dev);
 328         if (!hcd)
 329                 return;
 330
 331         if (test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags) &&
 332                         hcd->driver->shutdown)
 333                 hcd->driver->shutdown(hcd);
 334 }
 335 EXPORT_SYMBOL_GPL(usb_hcd_pci_shutdown);
 336
 337 #ifdef  CONFIG_PM_OPS
 338
 339 #ifdef  CONFIG_PPC_PMAC
 340 static void powermac_set_asic(struct pci_dev *pci_dev, int enable)
 341 {
 342         /* Enanble or disable ASIC clocks for USB */
 343         if (machine_is(powermac)) {
 344                 struct device_node      *of_node;
 345
 346                 of_node = pci_device_to_OF_node(pci_dev);
 347                 if (of_node)
 348                         pmac_call_feature(PMAC_FTR_USB_ENABLE,
 349                                         of_node, 0, enable);
 350         }
 351 }
 352
 353 #else
 354
 355 static inline void powermac_set_asic(struct pci_dev *pci_dev, int enable)
 356 {}
 357
 358 #endif  /* CONFIG_PPC_PMAC */
 359
 360 static int check_root_hub_suspended(struct device *dev)
 361 {
 362         struct pci_dev          *pci_dev = to_pci_dev(dev);
 363         struct usb_hcd          *hcd = pci_get_drvdata(pci_dev);
 364
 365         if (!(hcd->state == HC_STATE_SUSPENDED ||
 366                         hcd->state == HC_STATE_HALT)) {
 367                 dev_warn(dev, "Root hub is not suspended\n");
 368                 return -EBUSY;
 369         }
 370         return 0;
 371 }
 372
 373 static int suspend_common(struct device *dev, bool do_wakeup)
 374 {
 375         struct pci_dev          *pci_dev = to_pci_dev(dev);
 376         struct usb_hcd          *hcd = pci_get_drvdata(pci_dev);
 377         int                     retval;
 378
 379         /* Root hub suspend should have stopped all downstream traffic,
 380          * and all bus master traffic.  And done so for both the interface
 381          * and the stub usb_device (which we check here).  But maybe it
 382          * didn't; writing sysfs power/state files ignores such rules...
 383          */
 384         retval = check_root_hub_suspended(dev);
 385         if (retval)
 386                 return retval;
 387
 388         if (hcd->driver->pci_suspend) {
 389                 /* Optimization: Don't suspend if a root-hub wakeup is
 390                  * pending and it would cause the HCD to wake up anyway.
 391                  */
 392                 if (do_wakeup && HCD_WAKEUP_PENDING(hcd))
 393                         return -EBUSY;
 394                 retval = hcd->driver->pci_suspend(hcd, do_wakeup);
 395                 suspend_report_result(hcd->driver->pci_suspend, retval);
 396
 397                 /* Check again in case wakeup raced with pci_suspend */
 398                 if (retval == 0 && do_wakeup && HCD_WAKEUP_PENDING(hcd)) {
 399                         if (hcd->driver->pci_resume)
 400                                 hcd->driver->pci_resume(hcd, false);
 401                         retval = -EBUSY;
 402                 }
 403                 if (retval)
 404                         return retval;
 405         }
 406
 407         synchronize_irq(pci_dev->irq);
 408
 409         /* Downstream ports from this root hub should already be quiesced, so
 410          * there will be no DMA activity.  Now we can shut down the upstream
 411          * link (except maybe for PME# resume signaling).  We'll enter a
 412          * low power state during suspend_noirq, if the hardware allows.
 413          */
 414         pci_disable_device(pci_dev);
 415         return retval;
 416 }
 417
 418 static int resume_common(struct device *dev, int event)
 419 {
 420         struct pci_dev          *pci_dev = to_pci_dev(dev);
 421         struct usb_hcd          *hcd = pci_get_drvdata(pci_dev);
 422         int                     retval;
 423
 424         if (hcd->state != HC_STATE_SUSPENDED) {
 425                 dev_dbg(dev, "can't resume, not suspended!\n");
 426                 return 0;
 427         }
 428
 429         retval = pci_enable_device(pci_dev);
 430         if (retval < 0) {
 431                 dev_err(dev, "can't re-enable after resume, %d!\n", retval);
 432                 return retval;
 433         }
 434
 435         pci_set_master(pci_dev);
 436
 437         clear_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
 438
 439         if (hcd->driver->pci_resume) {
 440                 if (event != PM_EVENT_AUTO_RESUME)
 441                         wait_for_companions(pci_dev, hcd);
 442
 443                 retval = hcd->driver->pci_resume(hcd,
 444                                 event == PM_EVENT_RESTORE);
 445                 if (retval) {
 446                         dev_err(dev, "PCI post-resume error %d!\n", retval);
 447                         usb_hc_died(hcd);
 448                 }
 449         }
 450         return retval;
 451 }
 452
 453 #ifdef  CONFIG_PM_SLEEP
 454
 455 static int hcd_pci_suspend(struct device *dev)
 456 {
 457         return suspend_common(dev, device_may_wakeup(dev));
 458 }
 459
 460 static int hcd_pci_suspend_noirq(struct device *dev)
 461 {
 462         struct pci_dev          *pci_dev = to_pci_dev(dev);
 463         struct usb_hcd          *hcd = pci_get_drvdata(pci_dev);
 464         int                     retval;
 465
 466         retval = check_root_hub_suspended(dev);
 467         if (retval)
 468                 return retval;
 469
 470         pci_save_state(pci_dev);
 471
 472         /* If the root hub is HALTed rather than SUSPENDed,
 473          * disallow remote wakeup.
 474          */
 475         if (hcd->state == HC_STATE_HALT)
 476                 device_set_wakeup_enable(dev, 0);
 477         dev_dbg(dev, "wakeup: %d\n", device_may_wakeup(dev));
 478
 479         /* Possibly enable remote wakeup,
 480          * choose the appropriate low-power state, and go to that state.
 481          */
 482         retval = pci_prepare_to_sleep(pci_dev);
 483         if (retval == -EIO) {           /* Low-power not supported */
 484                 dev_dbg(dev, "--> PCI D0 legacy\n");
 485                 retval = 0;
 486         } else if (retval == 0) {
 487                 dev_dbg(dev, "--> PCI %s\n",
 488                                 pci_power_name(pci_dev->current_state));
 489         } else {
 490                 suspend_report_result(pci_prepare_to_sleep, retval);
 491                 return retval;
 492         }
 493
 494         powermac_set_asic(pci_dev, 0);
 495         return retval;
 496 }
 497
 498 static int hcd_pci_resume_noirq(struct device *dev)
 499 {
 500         struct pci_dev          *pci_dev = to_pci_dev(dev);
 501
 502         powermac_set_asic(pci_dev, 1);
 503
 504         /* Go back to D0 and disable remote wakeup */
 505         pci_back_from_sleep(pci_dev);
 506         return 0;
 507 }
 508
 509 static int hcd_pci_resume(struct device *dev)
 510 {
 511         return resume_common(dev, PM_EVENT_RESUME);
 512 }
 513
 514 static int hcd_pci_restore(struct device *dev)
 515 {
 516         return resume_common(dev, PM_EVENT_RESTORE);
 517 }
 518
 519 #else
 520
 521 #define hcd_pci_suspend         NULL
 522 #define hcd_pci_suspend_noirq   NULL
 523 #define hcd_pci_resume_noirq    NULL
 524 #define hcd_pci_resume          NULL
 525 #define hcd_pci_restore         NULL
 526
 527 #endif  /* CONFIG_PM_SLEEP */
 528
 529 #ifdef  CONFIG_PM_RUNTIME
 530
 531 static int hcd_pci_runtime_suspend(struct device *dev)
 532 {
 533         int     retval;
 534
 535         retval = suspend_common(dev, true);
 536         if (retval == 0)
 537                 powermac_set_asic(to_pci_dev(dev), 0);
 538         dev_dbg(dev, "hcd_pci_runtime_suspend: %d\n", retval);
 539         return retval;
 540 }
 541
 542 static int hcd_pci_runtime_resume(struct device *dev)
 543 {
 544         int     retval;
 545
 546         powermac_set_asic(to_pci_dev(dev), 1);
 547         retval = resume_common(dev, PM_EVENT_AUTO_RESUME);
 548         dev_dbg(dev, "hcd_pci_runtime_resume: %d\n", retval);
 549         return retval;
 550 }
 551
 552 #else
 553
 554 #define hcd_pci_runtime_suspend NULL
 555 #define hcd_pci_runtime_resume  NULL
 556
 557 #endif  /* CONFIG_PM_RUNTIME */
 558
 559 const struct dev_pm_ops usb_hcd_pci_pm_ops = {
 560         .suspend        = hcd_pci_suspend,
 561         .suspend_noirq  = hcd_pci_suspend_noirq,
 562         .resume_noirq   = hcd_pci_resume_noirq,
 563         .resume         = hcd_pci_resume,
 564         .freeze         = check_root_hub_suspended,
 565         .freeze_noirq   = check_root_hub_suspended,
 566         .thaw_noirq     = NULL,
 567         .thaw           = NULL,
 568         .poweroff       = hcd_pci_suspend,
 569         .poweroff_noirq = hcd_pci_suspend_noirq,
 570         .restore_noirq  = hcd_pci_resume_noirq,
 571         .restore        = hcd_pci_restore,
 572         .runtime_suspend = hcd_pci_runtime_suspend,
 573         .runtime_resume = hcd_pci_runtime_resume,
 574 };
 575 EXPORT_SYMBOL_GPL(usb_hcd_pci_pm_ops);
 576
 577 #endif  /* CONFIG_PM_OPS */