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 #define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_XHCI        0x15b5
  45 #define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_XHCI        0x15b6
  46 #define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_XHCI      0x15db
  47 #define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_XHCI      0x15d4
  48 #define PCI_DEVICE_ID_INTEL_TITAN_RIDGE_2C_XHCI         0x15e9
  49 #define PCI_DEVICE_ID_INTEL_TITAN_RIDGE_4C_XHCI         0x15ec
  50 #define PCI_DEVICE_ID_INTEL_TITAN_RIDGE_DD_XHCI         0x15f0
  51
  52 #define PCI_DEVICE_ID_AMD_PROMONTORYA_4                 0x43b9
  53 #define PCI_DEVICE_ID_AMD_PROMONTORYA_3                 0x43ba
  54 #define PCI_DEVICE_ID_AMD_PROMONTORYA_2                 0x43bb
  55 #define PCI_DEVICE_ID_AMD_PROMONTORYA_1                 0x43bc
  56 #define PCI_DEVICE_ID_ASMEDIA_1042A_XHCI                0x1142
  57
  58 static const char hcd_name[] = "xhci_hcd";
  59
  60 static struct hc_driver __read_mostly xhci_pci_hc_driver;
  61
  62 static int xhci_pci_setup(struct usb_hcd *hcd);
  63
  64 static const struct xhci_driver_overrides xhci_pci_overrides __initconst = {
  65         .reset = xhci_pci_setup,
  66 };
  67
  68 /* called after powerup, by probe or system-pm "wakeup" */
  69 static int xhci_pci_reinit(struct xhci_hcd *xhci, struct pci_dev *pdev)
  70 {
  71         /*
  72          * TODO: Implement finding debug ports later.
  73          * TODO: see if there are any quirks that need to be added to handle
  74          * new extended capabilities.
  75          */
  76
  77         /* PCI Memory-Write-Invalidate cycle support is optional (uncommon) */
  78         if (!pci_set_mwi(pdev))
  79                 xhci_dbg(xhci, "MWI active\n");
  80
  81         xhci_dbg(xhci, "Finished xhci_pci_reinit\n");
  82         return 0;
  83 }
  84
  85 static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
  86 {
  87         struct pci_dev          *pdev = to_pci_dev(dev);
  88
  89         /* Look for vendor-specific quirks */
  90         if (pdev->vendor == PCI_VENDOR_ID_FRESCO_LOGIC &&
  91                         (pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_PDK ||
  92                          pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_FL1400)) {
  93                 if (pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_PDK &&
  94                                 pdev->revision == 0x0) {
  95                         xhci->quirks |= XHCI_RESET_EP_QUIRK;
  96                         xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
  97                                 "QUIRK: Fresco Logic xHC needs configure"
  98                                 " endpoint cmd after reset endpoint");
  99                 }
 100                 if (pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_PDK &&
 101                                 pdev->revision == 0x4) {
 102                         xhci->quirks |= XHCI_SLOW_SUSPEND;
 103                         xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
 104                                 "QUIRK: Fresco Logic xHC revision %u"
 105                                 "must be suspended extra slowly",
 106                                 pdev->revision);
 107                 }
 108                 if (pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_PDK)
 109                         xhci->quirks |= XHCI_BROKEN_STREAMS;
 110                 /* Fresco Logic confirms: all revisions of this chip do not
 111                  * support MSI, even though some of them claim to in their PCI
 112                  * capabilities.
 113                  */
 114                 xhci->quirks |= XHCI_BROKEN_MSI;
 115                 xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
 116                                 "QUIRK: Fresco Logic revision %u "
 117                                 "has broken MSI implementation",
 118                                 pdev->revision);
 119                 xhci->quirks |= XHCI_TRUST_TX_LENGTH;
 120         }
 121
 122         if (pdev->vendor == PCI_VENDOR_ID_FRESCO_LOGIC &&
 123                         pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_FL1009)
 124                 xhci->quirks |= XHCI_BROKEN_STREAMS;
 125
 126         if (pdev->vendor == PCI_VENDOR_ID_NEC)
 127                 xhci->quirks |= XHCI_NEC_HOST;
 128
 129         if (pdev->vendor == PCI_VENDOR_ID_AMD && xhci->hci_version == 0x96)
 130                 xhci->quirks |= XHCI_AMD_0x96_HOST;
 131
 132         /* AMD PLL quirk */
 133         if (pdev->vendor == PCI_VENDOR_ID_AMD && usb_amd_find_chipset_info())
 134                 xhci->quirks |= XHCI_AMD_PLL_FIX;
 135
 136         if (pdev->vendor == PCI_VENDOR_ID_AMD &&
 137                 (pdev->device == 0x15e0 ||
 138                  pdev->device == 0x15e1 ||
 139                  pdev->device == 0x43bb))
 140                 xhci->quirks |= XHCI_SUSPEND_DELAY;
 141
 142         if (pdev->vendor == PCI_VENDOR_ID_AMD &&
 143             (pdev->device == 0x15e0 || pdev->device == 0x15e1))
 144                 xhci->quirks |= XHCI_SNPS_BROKEN_SUSPEND;
 145
 146         if (pdev->vendor == PCI_VENDOR_ID_AMD)
 147                 xhci->quirks |= XHCI_TRUST_TX_LENGTH;
 148
 149         if ((pdev->vendor == PCI_VENDOR_ID_AMD) &&
 150                 ((pdev->device == PCI_DEVICE_ID_AMD_PROMONTORYA_4) ||
 151                 (pdev->device == PCI_DEVICE_ID_AMD_PROMONTORYA_3) ||
 152                 (pdev->device == PCI_DEVICE_ID_AMD_PROMONTORYA_2) ||
 153                 (pdev->device == PCI_DEVICE_ID_AMD_PROMONTORYA_1)))
 154                 xhci->quirks |= XHCI_U2_DISABLE_WAKE;
 155
 156         if (pdev->vendor == PCI_VENDOR_ID_INTEL) {
 157                 xhci->quirks |= XHCI_LPM_SUPPORT;
 158                 xhci->quirks |= XHCI_INTEL_HOST;
 159                 xhci->quirks |= XHCI_AVOID_BEI;
 160         }
 161         if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
 162                         pdev->device == PCI_DEVICE_ID_INTEL_PANTHERPOINT_XHCI) {
 163                 xhci->quirks |= XHCI_EP_LIMIT_QUIRK;
 164                 xhci->limit_active_eps = 64;
 165                 xhci->quirks |= XHCI_SW_BW_CHECKING;
 166                 /*
 167                  * PPT desktop boards DH77EB and DH77DF will power back on after
 168                  * a few seconds of being shutdown.  The fix for this is to
 169                  * switch the ports from xHCI to EHCI on shutdown.  We can't use
 170                  * DMI information to find those particular boards (since each
 171                  * vendor will change the board name), so we have to key off all
 172                  * PPT chipsets.
 173                  */
 174                 xhci->quirks |= XHCI_SPURIOUS_REBOOT;
 175         }
 176         if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
 177                 (pdev->device == PCI_DEVICE_ID_INTEL_LYNXPOINT_LP_XHCI ||
 178                  pdev->device == PCI_DEVICE_ID_INTEL_WILDCATPOINT_LP_XHCI)) {
 179                 xhci->quirks |= XHCI_SPURIOUS_REBOOT;
 180                 xhci->quirks |= XHCI_SPURIOUS_WAKEUP;
 181         }
 182         if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
 183                 (pdev->device == PCI_DEVICE_ID_INTEL_SUNRISEPOINT_LP_XHCI ||
 184                  pdev->device == PCI_DEVICE_ID_INTEL_SUNRISEPOINT_H_XHCI ||
 185                  pdev->device == PCI_DEVICE_ID_INTEL_CHERRYVIEW_XHCI ||
 186                  pdev->device == PCI_DEVICE_ID_INTEL_BROXTON_M_XHCI ||
 187                  pdev->device == PCI_DEVICE_ID_INTEL_BROXTON_B_XHCI ||
 188                  pdev->device == PCI_DEVICE_ID_INTEL_APL_XHCI ||
 189                  pdev->device == PCI_DEVICE_ID_INTEL_DNV_XHCI)) {
 190                 xhci->quirks |= XHCI_PME_STUCK_QUIRK;
 191         }
 192         if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
 193             pdev->device == PCI_DEVICE_ID_INTEL_CHERRYVIEW_XHCI)
 194                 xhci->quirks |= XHCI_SSIC_PORT_UNUSED;
 195         if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
 196             (pdev->device == PCI_DEVICE_ID_INTEL_CHERRYVIEW_XHCI ||
 197              pdev->device == PCI_DEVICE_ID_INTEL_APL_XHCI))
 198                 xhci->quirks |= XHCI_INTEL_USB_ROLE_SW;
 199         if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
 200             (pdev->device == PCI_DEVICE_ID_INTEL_CHERRYVIEW_XHCI ||
 201              pdev->device == PCI_DEVICE_ID_INTEL_SUNRISEPOINT_LP_XHCI ||
 202              pdev->device == PCI_DEVICE_ID_INTEL_SUNRISEPOINT_H_XHCI ||
 203              pdev->device == PCI_DEVICE_ID_INTEL_APL_XHCI ||
 204              pdev->device == PCI_DEVICE_ID_INTEL_DNV_XHCI))
 205                 xhci->quirks |= XHCI_MISSING_CAS;
 206
 207         if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
 208             (pdev->device == PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_XHCI ||
 209              pdev->device == PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_XHCI ||
 210              pdev->device == PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_XHCI ||
 211              pdev->device == PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_XHCI ||
 212              pdev->device == PCI_DEVICE_ID_INTEL_TITAN_RIDGE_2C_XHCI ||
 213              pdev->device == PCI_DEVICE_ID_INTEL_TITAN_RIDGE_4C_XHCI ||
 214              pdev->device == PCI_DEVICE_ID_INTEL_TITAN_RIDGE_DD_XHCI))
 215                 xhci->quirks |= XHCI_DEFAULT_PM_RUNTIME_ALLOW;
 216
 217         if (pdev->vendor == PCI_VENDOR_ID_ETRON &&
 218                         pdev->device == PCI_DEVICE_ID_EJ168) {
 219                 xhci->quirks |= XHCI_RESET_ON_RESUME;
 220                 xhci->quirks |= XHCI_TRUST_TX_LENGTH;
 221                 xhci->quirks |= XHCI_BROKEN_STREAMS;
 222         }
 223         if (pdev->vendor == PCI_VENDOR_ID_RENESAS &&
 224             pdev->device == 0x0014) {
 225                 xhci->quirks |= XHCI_TRUST_TX_LENGTH;
 226                 xhci->quirks |= XHCI_ZERO_64B_REGS;
 227         }
 228         if (pdev->vendor == PCI_VENDOR_ID_RENESAS &&
 229             pdev->device == 0x0015) {
 230                 xhci->quirks |= XHCI_RESET_ON_RESUME;
 231                 xhci->quirks |= XHCI_ZERO_64B_REGS;
 232         }
 233         if (pdev->vendor == PCI_VENDOR_ID_VIA)
 234                 xhci->quirks |= XHCI_RESET_ON_RESUME;
 235
 236         /* See https://bugzilla.kernel.org/show_bug.cgi?id=79511 */
 237         if (pdev->vendor == PCI_VENDOR_ID_VIA &&
 238                         pdev->device == 0x3432)
 239                 xhci->quirks |= XHCI_BROKEN_STREAMS;
 240
 241         if (pdev->vendor == PCI_VENDOR_ID_ASMEDIA &&
 242                         pdev->device == 0x1042)
 243                 xhci->quirks |= XHCI_BROKEN_STREAMS;
 244         if (pdev->vendor == PCI_VENDOR_ID_ASMEDIA &&
 245                         pdev->device == 0x1142)
 246                 xhci->quirks |= XHCI_TRUST_TX_LENGTH;
 247
 248         if (pdev->vendor == PCI_VENDOR_ID_ASMEDIA &&
 249                 pdev->device == PCI_DEVICE_ID_ASMEDIA_1042A_XHCI)
 250                 xhci->quirks |= XHCI_ASMEDIA_MODIFY_FLOWCONTROL;
 251
 252         if (pdev->vendor == PCI_VENDOR_ID_TI && pdev->device == 0x8241)
 253                 xhci->quirks |= XHCI_LIMIT_ENDPOINT_INTERVAL_7;
 254
 255         if ((pdev->vendor == PCI_VENDOR_ID_BROADCOM ||
 256              pdev->vendor == PCI_VENDOR_ID_CAVIUM) &&
 257              pdev->device == 0x9026)
 258                 xhci->quirks |= XHCI_RESET_PLL_ON_DISCONNECT;
 259
 260         if (xhci->quirks & XHCI_RESET_ON_RESUME)
 261                 xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
 262                                 "QUIRK: Resetting on resume");
 263 }
 264
 265 #ifdef CONFIG_ACPI
 266 static void xhci_pme_acpi_rtd3_enable(struct pci_dev *dev)
 267 {
 268         static const guid_t intel_dsm_guid =
 269                 GUID_INIT(0xac340cb7, 0xe901, 0x45bf,
 270                           0xb7, 0xe6, 0x2b, 0x34, 0xec, 0x93, 0x1e, 0x23);
 271         union acpi_object *obj;
 272
 273         obj = acpi_evaluate_dsm(ACPI_HANDLE(&dev->dev), &intel_dsm_guid, 3, 1,
 274                                 NULL);
 275         ACPI_FREE(obj);
 276 }
 277 #else
 278 static void xhci_pme_acpi_rtd3_enable(struct pci_dev *dev) { }
 279 #endif /* CONFIG_ACPI */
 280
 281 /* called during probe() after chip reset completes */
 282 static int xhci_pci_setup(struct usb_hcd *hcd)
 283 {
 284         struct xhci_hcd         *xhci;
 285         struct pci_dev          *pdev = to_pci_dev(hcd->self.controller);
 286         int                     retval;
 287
 288         xhci = hcd_to_xhci(hcd);
 289         if (!xhci->sbrn)
 290                 pci_read_config_byte(pdev, XHCI_SBRN_OFFSET, &xhci->sbrn);
 291
 292         /* imod_interval is the interrupt moderation value in nanoseconds. */
 293         xhci->imod_interval = 40000;
 294
 295         retval = xhci_gen_setup(hcd, xhci_pci_quirks);
 296         if (retval)
 297                 return retval;
 298
 299         if (!usb_hcd_is_primary_hcd(hcd))
 300                 return 0;
 301
 302         xhci_dbg(xhci, "Got SBRN %u\n", (unsigned int) xhci->sbrn);
 303
 304         /* Find any debug ports */
 305         return xhci_pci_reinit(xhci, pdev);
 306 }
 307
 308 /*
 309  * We need to register our own PCI probe function (instead of the USB core's
 310  * function) in order to create a second roothub under xHCI.
 311  */
 312 static int xhci_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
 313 {
 314         int retval;
 315         struct xhci_hcd *xhci;
 316         struct hc_driver *driver;
 317         struct usb_hcd *hcd;
 318
 319         driver = (struct hc_driver *)id->driver_data;
 320
 321         /* Prevent runtime suspending between USB-2 and USB-3 initialization */
 322         pm_runtime_get_noresume(&dev->dev);
 323
 324         /* Register the USB 2.0 roothub.
 325          * FIXME: USB core must know to register the USB 2.0 roothub first.
 326          * This is sort of silly, because we could just set the HCD driver flags
 327          * to say USB 2.0, but I'm not sure what the implications would be in
 328          * the other parts of the HCD code.
 329          */
 330         retval = usb_hcd_pci_probe(dev, id);
 331
 332         if (retval)
 333                 goto put_runtime_pm;
 334
 335         /* USB 2.0 roothub is stored in the PCI device now. */
 336         hcd = dev_get_drvdata(&dev->dev);
 337         xhci = hcd_to_xhci(hcd);
 338         xhci->shared_hcd = usb_create_shared_hcd(driver, &dev->dev,
 339                                 pci_name(dev), hcd);
 340         if (!xhci->shared_hcd) {
 341                 retval = -ENOMEM;
 342                 goto dealloc_usb2_hcd;
 343         }
 344
 345         retval = xhci_ext_cap_init(xhci);
 346         if (retval)
 347                 goto put_usb3_hcd;
 348
 349         retval = usb_add_hcd(xhci->shared_hcd, dev->irq,
 350                         IRQF_SHARED);
 351         if (retval)
 352                 goto put_usb3_hcd;
 353         /* Roothub already marked as USB 3.0 speed */
 354
 355         if (!(xhci->quirks & XHCI_BROKEN_STREAMS) &&
 356                         HCC_MAX_PSA(xhci->hcc_params) >= 4)
 357                 xhci->shared_hcd->can_do_streams = 1;
 358
 359         if (xhci->quirks & XHCI_PME_STUCK_QUIRK)
 360                 xhci_pme_acpi_rtd3_enable(dev);
 361
 362         /* USB-2 and USB-3 roothubs initialized, allow runtime pm suspend */
 363         pm_runtime_put_noidle(&dev->dev);
 364
 365         if (xhci->quirks & XHCI_DEFAULT_PM_RUNTIME_ALLOW)
 366                 pm_runtime_allow(&dev->dev);
 367
 368         return 0;
 369
 370 put_usb3_hcd:
 371         usb_put_hcd(xhci->shared_hcd);
 372 dealloc_usb2_hcd:
 373         usb_hcd_pci_remove(dev);
 374 put_runtime_pm:
 375         pm_runtime_put_noidle(&dev->dev);
 376         return retval;
 377 }
 378
 379 static void xhci_pci_remove(struct pci_dev *dev)
 380 {
 381         struct xhci_hcd *xhci;
 382
 383         xhci = hcd_to_xhci(pci_get_drvdata(dev));
 384         xhci->xhc_state |= XHCI_STATE_REMOVING;
 385
 386         if (xhci->quirks & XHCI_DEFAULT_PM_RUNTIME_ALLOW)
 387                 pm_runtime_forbid(&dev->dev);
 388
 389         if (xhci->shared_hcd) {
 390                 usb_remove_hcd(xhci->shared_hcd);
 391                 usb_put_hcd(xhci->shared_hcd);
 392                 xhci->shared_hcd = NULL;
 393         }
 394
 395         /* Workaround for spurious wakeups at shutdown with HSW */
 396         if (xhci->quirks & XHCI_SPURIOUS_WAKEUP)
 397                 pci_set_power_state(dev, PCI_D3hot);
 398
 399         usb_hcd_pci_remove(dev);
 400 }
 401
 402 #ifdef CONFIG_PM
 403 /*
 404  * In some Intel xHCI controllers, in order to get D3 working,
 405  * through a vendor specific SSIC CONFIG register at offset 0x883c,
 406  * SSIC PORT need to be marked as "unused" before putting xHCI
 407  * into D3. After D3 exit, the SSIC port need to be marked as "used".
 408  * Without this change, xHCI might not enter D3 state.
 409  */
 410 static void xhci_ssic_port_unused_quirk(struct usb_hcd *hcd, bool suspend)
 411 {
 412         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 413         u32 val;
 414         void __iomem *reg;
 415         int i;
 416
 417         for (i = 0; i < SSIC_PORT_NUM; i++) {
 418                 reg = (void __iomem *) xhci->cap_regs +
 419                                 SSIC_PORT_CFG2 +
 420                                 i * SSIC_PORT_CFG2_OFFSET;
 421
 422                 /* Notify SSIC that SSIC profile programming is not done. */
 423                 val = readl(reg) & ~PROG_DONE;
 424                 writel(val, reg);
 425
 426                 /* Mark SSIC port as unused(suspend) or used(resume) */
 427                 val = readl(reg);
 428                 if (suspend)
 429                         val |= SSIC_PORT_UNUSED;
 430                 else
 431                         val &= ~SSIC_PORT_UNUSED;
 432                 writel(val, reg);
 433
 434                 /* Notify SSIC that SSIC profile programming is done */
 435                 val = readl(reg) | PROG_DONE;
 436                 writel(val, reg);
 437                 readl(reg);
 438         }
 439 }
 440
 441 /*
 442  * Make sure PME works on some Intel xHCI controllers by writing 1 to clear
 443  * the Internal PME flag bit in vendor specific PMCTRL register at offset 0x80a4
 444  */
 445 static void xhci_pme_quirk(struct usb_hcd *hcd)
 446 {
 447         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 448         void __iomem *reg;
 449         u32 val;
 450
 451         reg = (void __iomem *) xhci->cap_regs + 0x80a4;
 452         val = readl(reg);
 453         writel(val | BIT(28), reg);
 454         readl(reg);
 455 }
 456
 457 static int xhci_pci_suspend(struct usb_hcd *hcd, bool do_wakeup)
 458 {
 459         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 460         struct pci_dev          *pdev = to_pci_dev(hcd->self.controller);
 461         int                     ret;
 462
 463         /*
 464          * Systems with the TI redriver that loses port status change events
 465          * need to have the registers polled during D3, so avoid D3cold.
 466          */
 467         if (xhci->quirks & XHCI_COMP_MODE_QUIRK)
 468                 pci_d3cold_disable(pdev);
 469
 470         if (xhci->quirks & XHCI_PME_STUCK_QUIRK)
 471                 xhci_pme_quirk(hcd);
 472
 473         if (xhci->quirks & XHCI_SSIC_PORT_UNUSED)
 474                 xhci_ssic_port_unused_quirk(hcd, true);
 475
 476         ret = xhci_suspend(xhci, do_wakeup);
 477         if (ret && (xhci->quirks & XHCI_SSIC_PORT_UNUSED))
 478                 xhci_ssic_port_unused_quirk(hcd, false);
 479
 480         return ret;
 481 }
 482
 483 static int xhci_pci_resume(struct usb_hcd *hcd, bool hibernated)
 484 {
 485         struct xhci_hcd         *xhci = hcd_to_xhci(hcd);
 486         struct pci_dev          *pdev = to_pci_dev(hcd->self.controller);
 487         int                     retval = 0;
 488
 489         /* The BIOS on systems with the Intel Panther Point chipset may or may
 490          * not support xHCI natively.  That means that during system resume, it
 491          * may switch the ports back to EHCI so that users can use their
 492          * keyboard to select a kernel from GRUB after resume from hibernate.
 493          *
 494          * The BIOS is supposed to remember whether the OS had xHCI ports
 495          * enabled before resume, and switch the ports back to xHCI when the
 496          * BIOS/OS semaphore is written, but we all know we can't trust BIOS
 497          * writers.
 498          *
 499          * Unconditionally switch the ports back to xHCI after a system resume.
 500          * It should not matter whether the EHCI or xHCI controller is
 501          * resumed first. It's enough to do the switchover in xHCI because
 502          * USB core won't notice anything as the hub driver doesn't start
 503          * running again until after all the devices (including both EHCI and
 504          * xHCI host controllers) have been resumed.
 505          */
 506
 507         if (pdev->vendor == PCI_VENDOR_ID_INTEL)
 508                 usb_enable_intel_xhci_ports(pdev);
 509
 510         if (xhci->quirks & XHCI_SSIC_PORT_UNUSED)
 511                 xhci_ssic_port_unused_quirk(hcd, false);
 512
 513         if (xhci->quirks & XHCI_PME_STUCK_QUIRK)
 514                 xhci_pme_quirk(hcd);
 515
 516         retval = xhci_resume(xhci, hibernated);
 517         return retval;
 518 }
 519 #endif /* CONFIG_PM */
 520
 521 /*-------------------------------------------------------------------------*/
 522
 523 /* PCI driver selection metadata; PCI hotplugging uses this */
 524 static const struct pci_device_id pci_ids[] = { {
 525         /* handle any USB 3.0 xHCI controller */
 526         PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_USB_XHCI, ~0),
 527         .driver_data =  (unsigned long) &xhci_pci_hc_driver,
 528         },
 529         { /* end: all zeroes */ }
 530 };
 531 MODULE_DEVICE_TABLE(pci, pci_ids);
 532
 533 /* pci driver glue; this is a "new style" PCI driver module */
 534 static struct pci_driver xhci_pci_driver = {
 535         .name =         (char *) hcd_name,
 536         .id_table =     pci_ids,
 537
 538         .probe =        xhci_pci_probe,
 539         .remove =       xhci_pci_remove,
 540         /* suspend and resume implemented later */
 541
 542         .shutdown =     usb_hcd_pci_shutdown,
 543 #ifdef CONFIG_PM
 544         .driver = {
 545                 .pm = &usb_hcd_pci_pm_ops
 546         },
 547 #endif
 548 };
 549
 550 static int __init xhci_pci_init(void)
 551 {
 552         xhci_init_driver(&xhci_pci_hc_driver, &xhci_pci_overrides);
 553 #ifdef CONFIG_PM
 554         xhci_pci_hc_driver.pci_suspend = xhci_pci_suspend;
 555         xhci_pci_hc_driver.pci_resume = xhci_pci_resume;
 556 #endif
 557         return pci_register_driver(&xhci_pci_driver);
 558 }
 559 module_init(xhci_pci_init);
 560
 561 static void __exit xhci_pci_exit(void)
 562 {
 563         pci_unregister_driver(&xhci_pci_driver);
 564 }
 565 module_exit(xhci_pci_exit);
 566
 567 MODULE_DESCRIPTION("xHCI PCI Host Controller Driver");
 568 MODULE_LICENSE("GPL");