drivers/usb/host/xhci-pci.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * xHCI host controller driver PCI Bus Glue.
   4  *
   5  * Copyright (C) 2008 Intel Corp.
   6  *
   7  * Author: Sarah Sharp
   8  * Some code borrowed from the Linux EHCI driver.
   9  */
  10
  11 #include <linux/pci.h>
  12 #include <linux/slab.h>
  13 #include <linux/module.h>
  14 #include <linux/acpi.h>
  15
  16 #include "xhci.h"
  17 #include "xhci-trace.h"
  18
  19 #define SSIC_PORT_NUM           2
  20 #define SSIC_PORT_CFG2          0x880c
  21 #define SSIC_PORT_CFG2_OFFSET   0x30
  22 #define PROG_DONE               (1 << 30)
  23 #define SSIC_PORT_UNUSED        (1 << 31)
  24
  25 /* Device for a quirk */
  26 #define PCI_VENDOR_ID_FRESCO_LOGIC      0x1b73
  27 #define PCI_DEVICE_ID_FRESCO_LOGIC_PDK  0x1000
  28 #define PCI_DEVICE_ID_FRESCO_LOGIC_FL1009       0x1009
  29 #define PCI_DEVICE_ID_FRESCO_LOGIC_FL1400       0x1400
  30
  31 #define PCI_VENDOR_ID_ETRON             0x1b6f
  32 #define PCI_DEVICE_ID_EJ168             0x7023
  33
  34 #define PCI_DEVICE_ID_INTEL_LYNXPOINT_XHCI      0x8c31
  35 #define PCI_DEVICE_ID_INTEL_LYNXPOINT_LP_XHCI   0x9c31
  36 #define PCI_DEVICE_ID_INTEL_WILDCATPOINT_LP_XHCI        0x9cb1
  37 #define PCI_DEVICE_ID_INTEL_CHERRYVIEW_XHCI             0x22b5
  38 #define PCI_DEVICE_ID_INTEL_SUNRISEPOINT_H_XHCI         0xa12f
  39 #define PCI_DEVICE_ID_INTEL_SUNRISEPOINT_LP_XHCI        0x9d2f
  40 #define PCI_DEVICE_ID_INTEL_BROXTON_M_XHCI              0x0aa8
  41 #define PCI_DEVICE_ID_INTEL_BROXTON_B_XHCI              0x1aa8
  42 #define PCI_DEVICE_ID_INTEL_APL_XHCI                    0x5aa8
  43 #define PCI_DEVICE_ID_INTEL_DNV_XHCI                    0x19d0
  44
  45 #define PCI_DEVICE_ID_ASMEDIA_1042A_XHCI                0x1142
  46
  47 static const char hcd_name[] = "xhci_hcd";
  48
  49 static struct hc_driver __read_mostly xhci_pci_hc_driver;
  50
  51 static int xhci_pci_setup(struct usb_hcd *hcd);
  52
  53 static const struct xhci_driver_overrides xhci_pci_overrides __initconst = {
  54         .reset = xhci_pci_setup,
  55 };
  56
  57 /* called after powerup, by probe or system-pm "wakeup" */
  58 static int xhci_pci_reinit(struct xhci_hcd *xhci, struct pci_dev *pdev)
  59 {
  60         /*
  61          * TODO: Implement finding debug ports later.
  62          * TODO: see if there are any quirks that need to be added to handle
  63          * new extended capabilities.
  64          */
  65
  66         /* PCI Memory-Write-Invalidate cycle support is optional (uncommon) */
  67         if (!pci_set_mwi(pdev))
  68                 xhci_dbg(xhci, "MWI active\n");
  69
  70         xhci_dbg(xhci, "Finished xhci_pci_reinit\n");
  71         return 0;
  72 }
  73
  74 static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
  75 {
  76         struct pci_dev          *pdev = to_pci_dev(dev);
  77
  78         /* Look for vendor-specific quirks */
  79         if (pdev->vendor == PCI_VENDOR_ID_FRESCO_LOGIC &&
  80                         (pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_PDK ||
  81                          pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_FL1400)) {
  82                 if (pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_PDK &&
  83                                 pdev->revision == 0x0) {
  84                         xhci->quirks |= XHCI_RESET_EP_QUIRK;
  85                         xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
  86                                 "QUIRK: Fresco Logic xHC needs configure"
  87                                 " endpoint cmd after reset endpoint");
  88                 }
  89                 if (pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_PDK &&
  90                                 pdev->revision == 0x4) {
  91                         xhci->quirks |= XHCI_SLOW_SUSPEND;
  92                         xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
  93                                 "QUIRK: Fresco Logic xHC revision %u"
  94                                 "must be suspended extra slowly",
  95                                 pdev->revision);
  96                 }
  97                 if (pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_PDK)
  98                         xhci->quirks |= XHCI_BROKEN_STREAMS;
  99                 /* Fresco Logic confirms: all revisions of this chip do not
 100                  * support MSI, even though some of them claim to in their PCI
 101                  * capabilities.
 102                  */
 103                 xhci->quirks |= XHCI_BROKEN_MSI;
 104                 xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
 105                                 "QUIRK: Fresco Logic revision %u "
 106                                 "has broken MSI implementation",
 107                                 pdev->revision);
 108                 xhci->quirks |= XHCI_TRUST_TX_LENGTH;
 109         }
 110
 111         if (pdev->vendor == PCI_VENDOR_ID_FRESCO_LOGIC &&
 112                         pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_FL1009)
 113                 xhci->quirks |= XHCI_BROKEN_STREAMS;
 114
 115         if (pdev->vendor == PCI_VENDOR_ID_NEC)
 116                 xhci->quirks |= XHCI_NEC_HOST;
 117
 118         if (pdev->vendor == PCI_VENDOR_ID_AMD && xhci->hci_version == 0x96)
 119                 xhci->quirks |= XHCI_AMD_0x96_HOST;
 120
 121         /* AMD PLL quirk */
 122         if (pdev->vendor == PCI_VENDOR_ID_AMD && usb_amd_find_chipset_info())
 123                 xhci->quirks |= XHCI_AMD_PLL_FIX;
 124
 125         if (pdev->vendor == PCI_VENDOR_ID_AMD)
 126                 xhci->quirks |= XHCI_TRUST_TX_LENGTH;
 127
 128         if (pdev->vendor == PCI_VENDOR_ID_INTEL) {
 129                 xhci->quirks |= XHCI_LPM_SUPPORT;
 130                 xhci->quirks |= XHCI_INTEL_HOST;
 131                 xhci->quirks |= XHCI_AVOID_BEI;
 132         }
 133         if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
 134                         pdev->device == PCI_DEVICE_ID_INTEL_PANTHERPOINT_XHCI) {
 135                 xhci->quirks |= XHCI_EP_LIMIT_QUIRK;
 136                 xhci->limit_active_eps = 64;
 137                 xhci->quirks |= XHCI_SW_BW_CHECKING;
 138                 /*
 139                  * PPT desktop boards DH77EB and DH77DF will power back on after
 140                  * a few seconds of being shutdown.  The fix for this is to
 141                  * switch the ports from xHCI to EHCI on shutdown.  We can't use
 142                  * DMI information to find those particular boards (since each
 143                  * vendor will change the board name), so we have to key off all
 144                  * PPT chipsets.
 145                  */
 146                 xhci->quirks |= XHCI_SPURIOUS_REBOOT;
 147         }
 148         if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
 149                 (pdev->device == PCI_DEVICE_ID_INTEL_LYNXPOINT_LP_XHCI ||
 150                  pdev->device == PCI_DEVICE_ID_INTEL_WILDCATPOINT_LP_XHCI)) {
 151                 xhci->quirks |= XHCI_SPURIOUS_REBOOT;
 152                 xhci->quirks |= XHCI_SPURIOUS_WAKEUP;
 153         }
 154         if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
 155                 (pdev->device == PCI_DEVICE_ID_INTEL_SUNRISEPOINT_LP_XHCI ||
 156                  pdev->device == PCI_DEVICE_ID_INTEL_SUNRISEPOINT_H_XHCI ||
 157                  pdev->device == PCI_DEVICE_ID_INTEL_CHERRYVIEW_XHCI ||
 158                  pdev->device == PCI_DEVICE_ID_INTEL_BROXTON_M_XHCI ||
 159                  pdev->device == PCI_DEVICE_ID_INTEL_BROXTON_B_XHCI ||
 160                  pdev->device == PCI_DEVICE_ID_INTEL_APL_XHCI ||
 161                  pdev->device == PCI_DEVICE_ID_INTEL_DNV_XHCI)) {
 162                 xhci->quirks |= XHCI_PME_STUCK_QUIRK;
 163         }
 164         if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
 165                  pdev->device == PCI_DEVICE_ID_INTEL_CHERRYVIEW_XHCI) {
 166                 xhci->quirks |= XHCI_SSIC_PORT_UNUSED;
 167         }
 168         if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
 169             (pdev->device == PCI_DEVICE_ID_INTEL_CHERRYVIEW_XHCI ||
 170              pdev->device == PCI_DEVICE_ID_INTEL_APL_XHCI ||
 171              pdev->device == PCI_DEVICE_ID_INTEL_DNV_XHCI))
 172                 xhci->quirks |= XHCI_MISSING_CAS;
 173
 174         if (pdev->vendor == PCI_VENDOR_ID_ETRON &&
 175                         pdev->device == PCI_DEVICE_ID_EJ168) {
 176                 xhci->quirks |= XHCI_RESET_ON_RESUME;
 177                 xhci->quirks |= XHCI_TRUST_TX_LENGTH;
 178                 xhci->quirks |= XHCI_BROKEN_STREAMS;
 179         }
 180         if (pdev->vendor == PCI_VENDOR_ID_RENESAS &&
 181                         pdev->device == 0x0015)
 182                 xhci->quirks |= XHCI_RESET_ON_RESUME;
 183         if (pdev->vendor == PCI_VENDOR_ID_VIA)
 184                 xhci->quirks |= XHCI_RESET_ON_RESUME;
 185
 186         /* See https://bugzilla.kernel.org/show_bug.cgi?id=79511 */
 187         if (pdev->vendor == PCI_VENDOR_ID_VIA &&
 188                         pdev->device == 0x3432)
 189                 xhci->quirks |= XHCI_BROKEN_STREAMS;
 190
 191         if (pdev->vendor == PCI_VENDOR_ID_ASMEDIA &&
 192                         pdev->device == 0x1042)
 193                 xhci->quirks |= XHCI_BROKEN_STREAMS;
 194         if (pdev->vendor == PCI_VENDOR_ID_ASMEDIA &&
 195                         pdev->device == 0x1142)
 196                 xhci->quirks |= XHCI_TRUST_TX_LENGTH;
 197
 198         if (pdev->vendor == PCI_VENDOR_ID_ASMEDIA &&
 199                 pdev->device == PCI_DEVICE_ID_ASMEDIA_1042A_XHCI)
 200                 xhci->quirks |= XHCI_ASMEDIA_MODIFY_FLOWCONTROL;
 201
 202         if (pdev->vendor == PCI_VENDOR_ID_TI && pdev->device == 0x8241)
 203                 xhci->quirks |= XHCI_LIMIT_ENDPOINT_INTERVAL_7;
 204
 205         if (xhci->quirks & XHCI_RESET_ON_RESUME)
 206                 xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
 207                                 "QUIRK: Resetting on resume");
 208 }
 209
 210 #ifdef CONFIG_ACPI
 211 static void xhci_pme_acpi_rtd3_enable(struct pci_dev *dev)
 212 {
 213         static const guid_t intel_dsm_guid =
 214                 GUID_INIT(0xac340cb7, 0xe901, 0x45bf,
 215                           0xb7, 0xe6, 0x2b, 0x34, 0xec, 0x93, 0x1e, 0x23);
 216         union acpi_object *obj;
 217
 218         obj = acpi_evaluate_dsm(ACPI_HANDLE(&dev->dev), &intel_dsm_guid, 3, 1,
 219                                 NULL);
 220         ACPI_FREE(obj);
 221 }
 222 #else
 223 static void xhci_pme_acpi_rtd3_enable(struct pci_dev *dev) { }
 224 #endif /* CONFIG_ACPI */
 225
 226 /* called during probe() after chip reset completes */
 227 static int xhci_pci_setup(struct usb_hcd *hcd)
 228 {
 229         struct xhci_hcd         *xhci;
 230         struct pci_dev          *pdev = to_pci_dev(hcd->self.controller);
 231         int                     retval;
 232
 233         xhci = hcd_to_xhci(hcd);
 234         if (!xhci->sbrn)
 235                 pci_read_config_byte(pdev, XHCI_SBRN_OFFSET, &xhci->sbrn);
 236
 237         retval = xhci_gen_setup(hcd, xhci_pci_quirks);
 238         if (retval)
 239                 return retval;
 240
 241         if (!usb_hcd_is_primary_hcd(hcd))
 242                 return 0;
 243
 244         xhci_dbg(xhci, "Got SBRN %u\n", (unsigned int) xhci->sbrn);
 245
 246         /* Find any debug ports */
 247         return xhci_pci_reinit(xhci, pdev);
 248 }
 249
 250 /*
 251  * We need to register our own PCI probe function (instead of the USB core's
 252  * function) in order to create a second roothub under xHCI.
 253  */
 254 static int xhci_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
 255 {
 256         int retval;
 257         struct xhci_hcd *xhci;
 258         struct hc_driver *driver;
 259         struct usb_hcd *hcd;
 260
 261         driver = (struct hc_driver *)id->driver_data;
 262
 263         /* For some HW implementation, a XHCI reset is just not enough... */
 264         if (usb_xhci_needs_pci_reset(dev)) {
 265                 dev_info(&dev->dev, "Resetting\n");
 266                 if (pci_reset_function_locked(dev))
 267                         dev_warn(&dev->dev, "Reset failed");
 268         }
 269
 270         /* Prevent runtime suspending between USB-2 and USB-3 initialization */
 271         pm_runtime_get_noresume(&dev->dev);
 272
 273         /* Register the USB 2.0 roothub.
 274          * FIXME: USB core must know to register the USB 2.0 roothub first.
 275          * This is sort of silly, because we could just set the HCD driver flags
 276          * to say USB 2.0, but I'm not sure what the implications would be in
 277          * the other parts of the HCD code.
 278          */
 279         retval = usb_hcd_pci_probe(dev, id);
 280
 281         if (retval)
 282                 goto put_runtime_pm;
 283
 284         /* USB 2.0 roothub is stored in the PCI device now. */
 285         hcd = dev_get_drvdata(&dev->dev);
 286         xhci = hcd_to_xhci(hcd);
 287         xhci->shared_hcd = usb_create_shared_hcd(driver, &dev->dev,
 288                                 pci_name(dev), hcd);
 289         if (!xhci->shared_hcd) {
 290                 retval = -ENOMEM;
 291                 goto dealloc_usb2_hcd;
 292         }
 293
 294         retval = usb_add_hcd(xhci->shared_hcd, dev->irq,
 295                         IRQF_SHARED);
 296         if (retval)
 297                 goto put_usb3_hcd;
 298         /* Roothub already marked as USB 3.0 speed */
 299
 300         if (!(xhci->quirks & XHCI_BROKEN_STREAMS) &&
 301                         HCC_MAX_PSA(xhci->hcc_params) >= 4)
 302                 xhci->shared_hcd->can_do_streams = 1;
 303
 304         if (xhci->quirks & XHCI_PME_STUCK_QUIRK)
 305                 xhci_pme_acpi_rtd3_enable(dev);
 306
 307         /* USB-2 and USB-3 roothubs initialized, allow runtime pm suspend */
 308         pm_runtime_put_noidle(&dev->dev);
 309
 310         return 0;
 311
 312 put_usb3_hcd:
 313         usb_put_hcd(xhci->shared_hcd);
 314 dealloc_usb2_hcd:
 315         usb_hcd_pci_remove(dev);
 316 put_runtime_pm:
 317         pm_runtime_put_noidle(&dev->dev);
 318         return retval;
 319 }
 320
 321 static void xhci_pci_remove(struct pci_dev *dev)
 322 {
 323         struct xhci_hcd *xhci;
 324
 325         xhci = hcd_to_xhci(pci_get_drvdata(dev));
 326         xhci->xhc_state |= XHCI_STATE_REMOVING;
 327         if (xhci->shared_hcd) {
 328                 usb_remove_hcd(xhci->shared_hcd);
 329                 usb_put_hcd(xhci->shared_hcd);
 330         }
 331
 332         /* Workaround for spurious wakeups at shutdown with HSW */
 333         if (xhci->quirks & XHCI_SPURIOUS_WAKEUP)
 334                 pci_set_power_state(dev, PCI_D3hot);
 335
 336         usb_hcd_pci_remove(dev);
 337 }
 338
 339 #ifdef CONFIG_PM
 340 /*
 341  * In some Intel xHCI controllers, in order to get D3 working,
 342  * through a vendor specific SSIC CONFIG register at offset 0x883c,
 343  * SSIC PORT need to be marked as "unused" before putting xHCI
 344  * into D3. After D3 exit, the SSIC port need to be marked as "used".
 345  * Without this change, xHCI might not enter D3 state.
 346  */
 347 static void xhci_ssic_port_unused_quirk(struct usb_hcd *hcd, bool suspend)
 348 {
 349         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 350         u32 val;
 351         void __iomem *reg;
 352         int i;
 353
 354         for (i = 0; i < SSIC_PORT_NUM; i++) {
 355                 reg = (void __iomem *) xhci->cap_regs +
 356                                 SSIC_PORT_CFG2 +
 357                                 i * SSIC_PORT_CFG2_OFFSET;
 358
 359                 /* Notify SSIC that SSIC profile programming is not done. */
 360                 val = readl(reg) & ~PROG_DONE;
 361                 writel(val, reg);
 362
 363                 /* Mark SSIC port as unused(suspend) or used(resume) */
 364                 val = readl(reg);
 365                 if (suspend)
 366                         val |= SSIC_PORT_UNUSED;
 367                 else
 368                         val &= ~SSIC_PORT_UNUSED;
 369                 writel(val, reg);
 370
 371                 /* Notify SSIC that SSIC profile programming is done */
 372                 val = readl(reg) | PROG_DONE;
 373                 writel(val, reg);
 374                 readl(reg);
 375         }
 376 }
 377
 378 /*
 379  * Make sure PME works on some Intel xHCI controllers by writing 1 to clear
 380  * the Internal PME flag bit in vendor specific PMCTRL register at offset 0x80a4
 381  */
 382 static void xhci_pme_quirk(struct usb_hcd *hcd)
 383 {
 384         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 385         void __iomem *reg;
 386         u32 val;
 387
 388         reg = (void __iomem *) xhci->cap_regs + 0x80a4;
 389         val = readl(reg);
 390         writel(val | BIT(28), reg);
 391         readl(reg);
 392 }
 393
 394 static int xhci_pci_suspend(struct usb_hcd *hcd, bool do_wakeup)
 395 {
 396         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 397         struct pci_dev          *pdev = to_pci_dev(hcd->self.controller);
 398         int                     ret;
 399
 400         /*
 401          * Systems with the TI redriver that loses port status change events
 402          * need to have the registers polled during D3, so avoid D3cold.
 403          */
 404         if (xhci->quirks & XHCI_COMP_MODE_QUIRK)
 405                 pci_d3cold_disable(pdev);
 406
 407         if (xhci->quirks & XHCI_PME_STUCK_QUIRK)
 408                 xhci_pme_quirk(hcd);
 409
 410         if (xhci->quirks & XHCI_SSIC_PORT_UNUSED)
 411                 xhci_ssic_port_unused_quirk(hcd, true);
 412
 413         ret = xhci_suspend(xhci, do_wakeup);
 414         if (ret && (xhci->quirks & XHCI_SSIC_PORT_UNUSED))
 415                 xhci_ssic_port_unused_quirk(hcd, false);
 416
 417         return ret;
 418 }
 419
 420 static int xhci_pci_resume(struct usb_hcd *hcd, bool hibernated)
 421 {
 422         struct xhci_hcd         *xhci = hcd_to_xhci(hcd);
 423         struct pci_dev          *pdev = to_pci_dev(hcd->self.controller);
 424         int                     retval = 0;
 425
 426         /* The BIOS on systems with the Intel Panther Point chipset may or may
 427          * not support xHCI natively.  That means that during system resume, it
 428          * may switch the ports back to EHCI so that users can use their
 429          * keyboard to select a kernel from GRUB after resume from hibernate.
 430          *
 431          * The BIOS is supposed to remember whether the OS had xHCI ports
 432          * enabled before resume, and switch the ports back to xHCI when the
 433          * BIOS/OS semaphore is written, but we all know we can't trust BIOS
 434          * writers.
 435          *
 436          * Unconditionally switch the ports back to xHCI after a system resume.
 437          * It should not matter whether the EHCI or xHCI controller is
 438          * resumed first. It's enough to do the switchover in xHCI because
 439          * USB core won't notice anything as the hub driver doesn't start
 440          * running again until after all the devices (including both EHCI and
 441          * xHCI host controllers) have been resumed.
 442          */
 443
 444         if (pdev->vendor == PCI_VENDOR_ID_INTEL)
 445                 usb_enable_intel_xhci_ports(pdev);
 446
 447         if (xhci->quirks & XHCI_SSIC_PORT_UNUSED)
 448                 xhci_ssic_port_unused_quirk(hcd, false);
 449
 450         if (xhci->quirks & XHCI_PME_STUCK_QUIRK)
 451                 xhci_pme_quirk(hcd);
 452
 453         retval = xhci_resume(xhci, hibernated);
 454         return retval;
 455 }
 456 #endif /* CONFIG_PM */
 457
 458 /*-------------------------------------------------------------------------*/
 459
 460 /* PCI driver selection metadata; PCI hotplugging uses this */
 461 static const struct pci_device_id pci_ids[] = { {
 462         /* handle any USB 3.0 xHCI controller */
 463         PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_USB_XHCI, ~0),
 464         .driver_data =  (unsigned long) &xhci_pci_hc_driver,
 465         },
 466         { /* end: all zeroes */ }
 467 };
 468 MODULE_DEVICE_TABLE(pci, pci_ids);
 469
 470 /* pci driver glue; this is a "new style" PCI driver module */
 471 static struct pci_driver xhci_pci_driver = {
 472         .name =         (char *) hcd_name,
 473         .id_table =     pci_ids,
 474
 475         .probe =        xhci_pci_probe,
 476         .remove =       xhci_pci_remove,
 477         /* suspend and resume implemented later */
 478
 479         .shutdown =     usb_hcd_pci_shutdown,
 480 #ifdef CONFIG_PM
 481         .driver = {
 482                 .pm = &usb_hcd_pci_pm_ops
 483         },
 484 #endif
 485 };
 486
 487 static int __init xhci_pci_init(void)
 488 {
 489         xhci_init_driver(&xhci_pci_hc_driver, &xhci_pci_overrides);
 490 #ifdef CONFIG_PM
 491         xhci_pci_hc_driver.pci_suspend = xhci_pci_suspend;
 492         xhci_pci_hc_driver.pci_resume = xhci_pci_resume;
 493 #endif
 494         return pci_register_driver(&xhci_pci_driver);
 495 }
 496 module_init(xhci_pci_init);
 497
 498 static void __exit xhci_pci_exit(void)
 499 {
 500         pci_unregister_driver(&xhci_pci_driver);
 501 }
 502 module_exit(xhci_pci_exit);
 503
 504 MODULE_DESCRIPTION("xHCI PCI Host Controller Driver");
 505 MODULE_LICENSE("GPL");