drivers/usb/host/pci-quirks.c

   1 /*
   2  * This file contains code to reset and initialize USB host controllers.
   3  * Some of it includes work-arounds for PCI hardware and BIOS quirks.
   4  * It may need to run early during booting -- before USB would normally
   5  * initialize -- to ensure that Linux doesn't use any legacy modes.
   6  *
   7  *  Copyright (c) 1999 Martin Mares <mj@ucw.cz>
   8  *  (and others)
   9  */
  10
  11 #include <linux/types.h>
  12 #include <linux/kernel.h>
  13 #include <linux/pci.h>
  14 #include <linux/init.h>
  15 #include <linux/delay.h>
  16 #include <linux/acpi.h>
  17 #include <linux/dmi.h>
  18 #include "pci-quirks.h"
  19 #include "xhci-ext-caps.h"
  20
  21
  22 #define UHCI_USBLEGSUP          0xc0            /* legacy support */
  23 #define UHCI_USBCMD             0               /* command register */
  24 #define UHCI_USBINTR            4               /* interrupt register */
  25 #define UHCI_USBLEGSUP_RWC      0x8f00          /* the R/WC bits */
  26 #define UHCI_USBLEGSUP_RO       0x5040          /* R/O and reserved bits */
  27 #define UHCI_USBCMD_RUN         0x0001          /* RUN/STOP bit */
  28 #define UHCI_USBCMD_HCRESET     0x0002          /* Host Controller reset */
  29 #define UHCI_USBCMD_EGSM        0x0008          /* Global Suspend Mode */
  30 #define UHCI_USBCMD_CONFIGURE   0x0040          /* Config Flag */
  31 #define UHCI_USBINTR_RESUME     0x0002          /* Resume interrupt enable */
  32
  33 #define OHCI_CONTROL            0x04
  34 #define OHCI_CMDSTATUS          0x08
  35 #define OHCI_INTRSTATUS         0x0c
  36 #define OHCI_INTRENABLE         0x10
  37 #define OHCI_INTRDISABLE        0x14
  38 #define OHCI_FMINTERVAL         0x34
  39 #define OHCI_HCR                (1 << 0)        /* host controller reset */
  40 #define OHCI_OCR                (1 << 3)        /* ownership change request */
  41 #define OHCI_CTRL_RWC           (1 << 9)        /* remote wakeup connected */
  42 #define OHCI_CTRL_IR            (1 << 8)        /* interrupt routing */
  43 #define OHCI_INTR_OC            (1 << 30)       /* ownership change */
  44
  45 #define EHCI_HCC_PARAMS         0x08            /* extended capabilities */
  46 #define EHCI_USBCMD             0               /* command register */
  47 #define EHCI_USBCMD_RUN         (1 << 0)        /* RUN/STOP bit */
  48 #define EHCI_USBSTS             4               /* status register */
  49 #define EHCI_USBSTS_HALTED      (1 << 12)       /* HCHalted bit */
  50 #define EHCI_USBINTR            8               /* interrupt register */
  51 #define EHCI_CONFIGFLAG         0x40            /* configured flag register */
  52 #define EHCI_USBLEGSUP          0               /* legacy support register */
  53 #define EHCI_USBLEGSUP_BIOS     (1 << 16)       /* BIOS semaphore */
  54 #define EHCI_USBLEGSUP_OS       (1 << 24)       /* OS semaphore */
  55 #define EHCI_USBLEGCTLSTS       4               /* legacy control/status */
  56 #define EHCI_USBLEGCTLSTS_SOOE  (1 << 13)       /* SMI on ownership change */
  57
  58 /* AMD quirk use */
  59 #define AB_REG_BAR_LOW          0xe0
  60 #define AB_REG_BAR_HIGH         0xe1
  61 #define AB_REG_BAR_SB700        0xf0
  62 #define AB_INDX(addr)           ((addr) + 0x00)
  63 #define AB_DATA(addr)           ((addr) + 0x04)
  64 #define AX_INDXC                0x30
  65 #define AX_DATAC                0x34
  66
  67 #define NB_PCIE_INDX_ADDR       0xe0
  68 #define NB_PCIE_INDX_DATA       0xe4
  69 #define PCIE_P_CNTL             0x10040
  70 #define BIF_NB                  0x10002
  71 #define NB_PIF0_PWRDOWN_0       0x01100012
  72 #define NB_PIF0_PWRDOWN_1       0x01100013
  73
  74 #define USB_INTEL_XUSB2PR      0xD0
  75 #define USB_INTEL_USB3_PSSEN   0xD8
  76
  77 static struct amd_chipset_info {
  78         struct pci_dev  *nb_dev;
  79         struct pci_dev  *smbus_dev;
  80         int nb_type;
  81         int sb_type;
  82         int isoc_reqs;
  83         int probe_count;
  84         int probe_result;
  85 } amd_chipset;
  86
  87 static DEFINE_SPINLOCK(amd_lock);
  88
  89 int usb_amd_find_chipset_info(void)
  90 {
  91         u8 rev = 0;
  92         unsigned long flags;
  93         struct amd_chipset_info info;
  94         int ret;
  95
  96         spin_lock_irqsave(&amd_lock, flags);
  97
  98         /* probe only once */
  99         if (amd_chipset.probe_count > 0) {
 100                 amd_chipset.probe_count++;
 101                 spin_unlock_irqrestore(&amd_lock, flags);
 102                 return amd_chipset.probe_result;
 103         }
 104         memset(&info, 0, sizeof(info));
 105         spin_unlock_irqrestore(&amd_lock, flags);
 106
 107         info.smbus_dev = pci_get_device(PCI_VENDOR_ID_ATI, 0x4385, NULL);
 108         if (info.smbus_dev) {
 109                 rev = info.smbus_dev->revision;
 110                 if (rev >= 0x40)
 111                         info.sb_type = 1;
 112                 else if (rev >= 0x30 && rev <= 0x3b)
 113                         info.sb_type = 3;
 114         } else {
 115                 info.smbus_dev = pci_get_device(PCI_VENDOR_ID_AMD,
 116                                                 0x780b, NULL);
 117                 if (!info.smbus_dev) {
 118                         ret = 0;
 119                         goto commit;
 120                 }
 121
 122                 rev = info.smbus_dev->revision;
 123                 if (rev >= 0x11 && rev <= 0x18)
 124                         info.sb_type = 2;
 125         }
 126
 127         if (info.sb_type == 0) {
 128                 if (info.smbus_dev) {
 129                         pci_dev_put(info.smbus_dev);
 130                         info.smbus_dev = NULL;
 131                 }
 132                 ret = 0;
 133                 goto commit;
 134         }
 135
 136         info.nb_dev = pci_get_device(PCI_VENDOR_ID_AMD, 0x9601, NULL);
 137         if (info.nb_dev) {
 138                 info.nb_type = 1;
 139         } else {
 140                 info.nb_dev = pci_get_device(PCI_VENDOR_ID_AMD, 0x1510, NULL);
 141                 if (info.nb_dev) {
 142                         info.nb_type = 2;
 143                 } else {
 144                         info.nb_dev = pci_get_device(PCI_VENDOR_ID_AMD,
 145                                                      0x9600, NULL);
 146                         if (info.nb_dev)
 147                                 info.nb_type = 3;
 148                 }
 149         }
 150
 151         ret = info.probe_result = 1;
 152         printk(KERN_DEBUG "QUIRK: Enable AMD PLL fix\n");
 153
 154 commit:
 155
 156         spin_lock_irqsave(&amd_lock, flags);
 157         if (amd_chipset.probe_count > 0) {
 158                 /* race - someone else was faster - drop devices */
 159
 160                 /* Mark that we where here */
 161                 amd_chipset.probe_count++;
 162                 ret = amd_chipset.probe_result;
 163
 164                 spin_unlock_irqrestore(&amd_lock, flags);
 165
 166                 if (info.nb_dev)
 167                         pci_dev_put(info.nb_dev);
 168                 if (info.smbus_dev)
 169                         pci_dev_put(info.smbus_dev);
 170
 171         } else {
 172                 /* no race - commit the result */
 173                 info.probe_count++;
 174                 amd_chipset = info;
 175                 spin_unlock_irqrestore(&amd_lock, flags);
 176         }
 177
 178         return ret;
 179 }
 180 EXPORT_SYMBOL_GPL(usb_amd_find_chipset_info);
 181
 182 /*
 183  * The hardware normally enables the A-link power management feature, which
 184  * lets the system lower the power consumption in idle states.
 185  *
 186  * This USB quirk prevents the link going into that lower power state
 187  * during isochronous transfers.
 188  *
 189  * Without this quirk, isochronous stream on OHCI/EHCI/xHCI controllers of
 190  * some AMD platforms may stutter or have breaks occasionally.
 191  */
 192 static void usb_amd_quirk_pll(int disable)
 193 {
 194         u32 addr, addr_low, addr_high, val;
 195         u32 bit = disable ? 0 : 1;
 196         unsigned long flags;
 197
 198         spin_lock_irqsave(&amd_lock, flags);
 199
 200         if (disable) {
 201                 amd_chipset.isoc_reqs++;
 202                 if (amd_chipset.isoc_reqs > 1) {
 203                         spin_unlock_irqrestore(&amd_lock, flags);
 204                         return;
 205                 }
 206         } else {
 207                 amd_chipset.isoc_reqs--;
 208                 if (amd_chipset.isoc_reqs > 0) {
 209                         spin_unlock_irqrestore(&amd_lock, flags);
 210                         return;
 211                 }
 212         }
 213
 214         if (amd_chipset.sb_type == 1 || amd_chipset.sb_type == 2) {
 215                 outb_p(AB_REG_BAR_LOW, 0xcd6);
 216                 addr_low = inb_p(0xcd7);
 217                 outb_p(AB_REG_BAR_HIGH, 0xcd6);
 218                 addr_high = inb_p(0xcd7);
 219                 addr = addr_high << 8 | addr_low;
 220
 221                 outl_p(0x30, AB_INDX(addr));
 222                 outl_p(0x40, AB_DATA(addr));
 223                 outl_p(0x34, AB_INDX(addr));
 224                 val = inl_p(AB_DATA(addr));
 225         } else if (amd_chipset.sb_type == 3) {
 226                 pci_read_config_dword(amd_chipset.smbus_dev,
 227                                         AB_REG_BAR_SB700, &addr);
 228                 outl(AX_INDXC, AB_INDX(addr));
 229                 outl(0x40, AB_DATA(addr));
 230                 outl(AX_DATAC, AB_INDX(addr));
 231                 val = inl(AB_DATA(addr));
 232         } else {
 233                 spin_unlock_irqrestore(&amd_lock, flags);
 234                 return;
 235         }
 236
 237         if (disable) {
 238                 val &= ~0x08;
 239                 val |= (1 << 4) | (1 << 9);
 240         } else {
 241                 val |= 0x08;
 242                 val &= ~((1 << 4) | (1 << 9));
 243         }
 244         outl_p(val, AB_DATA(addr));
 245
 246         if (!amd_chipset.nb_dev) {
 247                 spin_unlock_irqrestore(&amd_lock, flags);
 248                 return;
 249         }
 250
 251         if (amd_chipset.nb_type == 1 || amd_chipset.nb_type == 3) {
 252                 addr = PCIE_P_CNTL;
 253                 pci_write_config_dword(amd_chipset.nb_dev,
 254                                         NB_PCIE_INDX_ADDR, addr);
 255                 pci_read_config_dword(amd_chipset.nb_dev,
 256                                         NB_PCIE_INDX_DATA, &val);
 257
 258                 val &= ~(1 | (1 << 3) | (1 << 4) | (1 << 9) | (1 << 12));
 259                 val |= bit | (bit << 3) | (bit << 12);
 260                 val |= ((!bit) << 4) | ((!bit) << 9);
 261                 pci_write_config_dword(amd_chipset.nb_dev,
 262                                         NB_PCIE_INDX_DATA, val);
 263
 264                 addr = BIF_NB;
 265                 pci_write_config_dword(amd_chipset.nb_dev,
 266                                         NB_PCIE_INDX_ADDR, addr);
 267                 pci_read_config_dword(amd_chipset.nb_dev,
 268                                         NB_PCIE_INDX_DATA, &val);
 269                 val &= ~(1 << 8);
 270                 val |= bit << 8;
 271
 272                 pci_write_config_dword(amd_chipset.nb_dev,
 273                                         NB_PCIE_INDX_DATA, val);
 274         } else if (amd_chipset.nb_type == 2) {
 275                 addr = NB_PIF0_PWRDOWN_0;
 276                 pci_write_config_dword(amd_chipset.nb_dev,
 277                                         NB_PCIE_INDX_ADDR, addr);
 278                 pci_read_config_dword(amd_chipset.nb_dev,
 279                                         NB_PCIE_INDX_DATA, &val);
 280                 if (disable)
 281                         val &= ~(0x3f << 7);
 282                 else
 283                         val |= 0x3f << 7;
 284
 285                 pci_write_config_dword(amd_chipset.nb_dev,
 286                                         NB_PCIE_INDX_DATA, val);
 287
 288                 addr = NB_PIF0_PWRDOWN_1;
 289                 pci_write_config_dword(amd_chipset.nb_dev,
 290                                         NB_PCIE_INDX_ADDR, addr);
 291                 pci_read_config_dword(amd_chipset.nb_dev,
 292                                         NB_PCIE_INDX_DATA, &val);
 293                 if (disable)
 294                         val &= ~(0x3f << 7);
 295                 else
 296                         val |= 0x3f << 7;
 297
 298                 pci_write_config_dword(amd_chipset.nb_dev,
 299                                         NB_PCIE_INDX_DATA, val);
 300         }
 301
 302         spin_unlock_irqrestore(&amd_lock, flags);
 303         return;
 304 }
 305
 306 void usb_amd_quirk_pll_disable(void)
 307 {
 308         usb_amd_quirk_pll(1);
 309 }
 310 EXPORT_SYMBOL_GPL(usb_amd_quirk_pll_disable);
 311
 312 void usb_amd_quirk_pll_enable(void)
 313 {
 314         usb_amd_quirk_pll(0);
 315 }
 316 EXPORT_SYMBOL_GPL(usb_amd_quirk_pll_enable);
 317
 318 void usb_amd_dev_put(void)
 319 {
 320         struct pci_dev *nb, *smbus;
 321         unsigned long flags;
 322
 323         spin_lock_irqsave(&amd_lock, flags);
 324
 325         amd_chipset.probe_count--;
 326         if (amd_chipset.probe_count > 0) {
 327                 spin_unlock_irqrestore(&amd_lock, flags);
 328                 return;
 329         }
 330
 331         /* save them to pci_dev_put outside of spinlock */
 332         nb    = amd_chipset.nb_dev;
 333         smbus = amd_chipset.smbus_dev;
 334
 335         amd_chipset.nb_dev = NULL;
 336         amd_chipset.smbus_dev = NULL;
 337         amd_chipset.nb_type = 0;
 338         amd_chipset.sb_type = 0;
 339         amd_chipset.isoc_reqs = 0;
 340         amd_chipset.probe_result = 0;
 341
 342         spin_unlock_irqrestore(&amd_lock, flags);
 343
 344         if (nb)
 345                 pci_dev_put(nb);
 346         if (smbus)
 347                 pci_dev_put(smbus);
 348 }
 349 EXPORT_SYMBOL_GPL(usb_amd_dev_put);
 350
 351 /*
 352  * Make sure the controller is completely inactive, unable to
 353  * generate interrupts or do DMA.
 354  */
 355 void uhci_reset_hc(struct pci_dev *pdev, unsigned long base)
 356 {
 357         /* Turn off PIRQ enable and SMI enable.  (This also turns off the
 358          * BIOS's USB Legacy Support.)  Turn off all the R/WC bits too.
 359          */
 360         pci_write_config_word(pdev, UHCI_USBLEGSUP, UHCI_USBLEGSUP_RWC);
 361
 362         /* Reset the HC - this will force us to get a
 363          * new notification of any already connected
 364          * ports due to the virtual disconnect that it
 365          * implies.
 366          */
 367         outw(UHCI_USBCMD_HCRESET, base + UHCI_USBCMD);
 368         mb();
 369         udelay(5);
 370         if (inw(base + UHCI_USBCMD) & UHCI_USBCMD_HCRESET)
 371                 dev_warn(&pdev->dev, "HCRESET not completed yet!\n");
 372
 373         /* Just to be safe, disable interrupt requests and
 374          * make sure the controller is stopped.
 375          */
 376         outw(0, base + UHCI_USBINTR);
 377         outw(0, base + UHCI_USBCMD);
 378 }
 379 EXPORT_SYMBOL_GPL(uhci_reset_hc);
 380
 381 /*
 382  * Initialize a controller that was newly discovered or has just been
 383  * resumed.  In either case we can't be sure of its previous state.
 384  *
 385  * Returns: 1 if the controller was reset, 0 otherwise.
 386  */
 387 int uhci_check_and_reset_hc(struct pci_dev *pdev, unsigned long base)
 388 {
 389         u16 legsup;
 390         unsigned int cmd, intr;
 391
 392         /*
 393          * When restarting a suspended controller, we expect all the
 394          * settings to be the same as we left them:
 395          *
 396          *      PIRQ and SMI disabled, no R/W bits set in USBLEGSUP;
 397          *      Controller is stopped and configured with EGSM set;
 398          *      No interrupts enabled except possibly Resume Detect.
 399          *
 400          * If any of these conditions are violated we do a complete reset.
 401          */
 402         pci_read_config_word(pdev, UHCI_USBLEGSUP, &legsup);
 403         if (legsup & ~(UHCI_USBLEGSUP_RO | UHCI_USBLEGSUP_RWC)) {
 404                 dev_dbg(&pdev->dev, "%s: legsup = 0x%04x\n",
 405                                 __func__, legsup);
 406                 goto reset_needed;
 407         }
 408
 409         cmd = inw(base + UHCI_USBCMD);
 410         if ((cmd & UHCI_USBCMD_RUN) || !(cmd & UHCI_USBCMD_CONFIGURE) ||
 411                         !(cmd & UHCI_USBCMD_EGSM)) {
 412                 dev_dbg(&pdev->dev, "%s: cmd = 0x%04x\n",
 413                                 __func__, cmd);
 414                 goto reset_needed;
 415         }
 416
 417         intr = inw(base + UHCI_USBINTR);
 418         if (intr & (~UHCI_USBINTR_RESUME)) {
 419                 dev_dbg(&pdev->dev, "%s: intr = 0x%04x\n",
 420                                 __func__, intr);
 421                 goto reset_needed;
 422         }
 423         return 0;
 424
 425 reset_needed:
 426         dev_dbg(&pdev->dev, "Performing full reset\n");
 427         uhci_reset_hc(pdev, base);
 428         return 1;
 429 }
 430 EXPORT_SYMBOL_GPL(uhci_check_and_reset_hc);
 431
 432 static inline int io_type_enabled(struct pci_dev *pdev, unsigned int mask)
 433 {
 434         u16 cmd;
 435         return !pci_read_config_word(pdev, PCI_COMMAND, &cmd) && (cmd & mask);
 436 }
 437
 438 #define pio_enabled(dev) io_type_enabled(dev, PCI_COMMAND_IO)
 439 #define mmio_enabled(dev) io_type_enabled(dev, PCI_COMMAND_MEMORY)
 440
 441 static void __devinit quirk_usb_handoff_uhci(struct pci_dev *pdev)
 442 {
 443         unsigned long base = 0;
 444         int i;
 445
 446         if (!pio_enabled(pdev))
 447                 return;
 448
 449         for (i = 0; i < PCI_ROM_RESOURCE; i++)
 450                 if ((pci_resource_flags(pdev, i) & IORESOURCE_IO)) {
 451                         base = pci_resource_start(pdev, i);
 452                         break;
 453                 }
 454
 455         if (base)
 456                 uhci_check_and_reset_hc(pdev, base);
 457 }
 458
 459 static int __devinit mmio_resource_enabled(struct pci_dev *pdev, int idx)
 460 {
 461         return pci_resource_start(pdev, idx) && mmio_enabled(pdev);
 462 }
 463
 464 static void __devinit quirk_usb_handoff_ohci(struct pci_dev *pdev)
 465 {
 466         void __iomem *base;
 467         u32 control;
 468
 469         if (!mmio_resource_enabled(pdev, 0))
 470                 return;
 471
 472         base = pci_ioremap_bar(pdev, 0);
 473         if (base == NULL)
 474                 return;
 475
 476         control = readl(base + OHCI_CONTROL);
 477
 478 /* On PA-RISC, PDC can leave IR set incorrectly; ignore it there. */
 479 #ifdef __hppa__
 480 #define OHCI_CTRL_MASK          (OHCI_CTRL_RWC | OHCI_CTRL_IR)
 481 #else
 482 #define OHCI_CTRL_MASK          OHCI_CTRL_RWC
 483
 484         if (control & OHCI_CTRL_IR) {
 485                 int wait_time = 500; /* arbitrary; 5 seconds */
 486                 writel(OHCI_INTR_OC, base + OHCI_INTRENABLE);
 487                 writel(OHCI_OCR, base + OHCI_CMDSTATUS);
 488                 while (wait_time > 0 &&
 489                                 readl(base + OHCI_CONTROL) & OHCI_CTRL_IR) {
 490                         wait_time -= 10;
 491                         msleep(10);
 492                 }
 493                 if (wait_time <= 0)
 494                         dev_warn(&pdev->dev, "OHCI: BIOS handoff failed"
 495                                         " (BIOS bug?) %08x\n",
 496                                         readl(base + OHCI_CONTROL));
 497         }
 498 #endif
 499
 500         /* reset controller, preserving RWC (and possibly IR) */
 501         writel(control & OHCI_CTRL_MASK, base + OHCI_CONTROL);
 502         readl(base + OHCI_CONTROL);
 503
 504         /* Some NVIDIA controllers stop working if kept in RESET for too long */
 505         if (pdev->vendor == PCI_VENDOR_ID_NVIDIA) {
 506                 u32 fminterval;
 507                 int cnt;
 508
 509                 /* drive reset for at least 50 ms (7.1.7.5) */
 510                 msleep(50);
 511
 512                 /* software reset of the controller, preserving HcFmInterval */
 513                 fminterval = readl(base + OHCI_FMINTERVAL);
 514                 writel(OHCI_HCR, base + OHCI_CMDSTATUS);
 515
 516                 /* reset requires max 10 us delay */
 517                 for (cnt = 30; cnt > 0; --cnt) {        /* ... allow extra time */
 518                         if ((readl(base + OHCI_CMDSTATUS) & OHCI_HCR) == 0)
 519                                 break;
 520                         udelay(1);
 521                 }
 522                 writel(fminterval, base + OHCI_FMINTERVAL);
 523
 524                 /* Now we're in the SUSPEND state with all devices reset
 525                  * and wakeups and interrupts disabled
 526                  */
 527         }
 528
 529         /*
 530          * disable interrupts
 531          */
 532         writel(~(u32)0, base + OHCI_INTRDISABLE);
 533         writel(~(u32)0, base + OHCI_INTRSTATUS);
 534
 535         iounmap(base);
 536 }
 537
 538 static const struct dmi_system_id __devinitconst ehci_dmi_nohandoff_table[] = {
 539         {
 540                 /*  Pegatron Lucid (ExoPC) */
 541                 .matches = {
 542                         DMI_MATCH(DMI_BOARD_NAME, "EXOPG06411"),
 543                         DMI_MATCH(DMI_BIOS_VERSION, "Lucid-CE-133"),
 544                 },
 545         },
 546         {
 547                 /*  Pegatron Lucid (Ordissimo AIRIS) */
 548                 .matches = {
 549                         DMI_MATCH(DMI_BOARD_NAME, "M11JB"),
 550                         DMI_MATCH(DMI_BIOS_VERSION, "Lucid-GE-133"),
 551                 },
 552         },
 553         { }
 554 };
 555
 556 static void __devinit ehci_bios_handoff(struct pci_dev *pdev,
 557                                         void __iomem *op_reg_base,
 558                                         u32 cap, u8 offset)
 559 {
 560         int try_handoff = 1, tried_handoff = 0;
 561
 562         /* The Pegatron Lucid tablet sporadically waits for 98 seconds trying
 563          * the handoff on its unused controller.  Skip it. */
 564         if (pdev->vendor == 0x8086 && pdev->device == 0x283a) {
 565                 if (dmi_check_system(ehci_dmi_nohandoff_table))
 566                         try_handoff = 0;
 567         }
 568
 569         if (try_handoff && (cap & EHCI_USBLEGSUP_BIOS)) {
 570                 dev_dbg(&pdev->dev, "EHCI: BIOS handoff\n");
 571
 572 #if 0
 573 /* aleksey_gorelov@phoenix.com reports that some systems need SMI forced on,
 574  * but that seems dubious in general (the BIOS left it off intentionally)
 575  * and is known to prevent some systems from booting.  so we won't do this
 576  * unless maybe we can determine when we're on a system that needs SMI forced.
 577  */
 578                 /* BIOS workaround (?): be sure the pre-Linux code
 579                  * receives the SMI
 580                  */
 581                 pci_read_config_dword(pdev, offset + EHCI_USBLEGCTLSTS, &val);
 582                 pci_write_config_dword(pdev, offset + EHCI_USBLEGCTLSTS,
 583                                        val | EHCI_USBLEGCTLSTS_SOOE);
 584 #endif
 585
 586                 /* some systems get upset if this semaphore is
 587                  * set for any other reason than forcing a BIOS
 588                  * handoff..
 589                  */
 590                 pci_write_config_byte(pdev, offset + 3, 1);
 591         }
 592
 593         /* if boot firmware now owns EHCI, spin till it hands it over. */
 594         if (try_handoff) {
 595                 int msec = 1000;
 596                 while ((cap & EHCI_USBLEGSUP_BIOS) && (msec > 0)) {
 597                         tried_handoff = 1;
 598                         msleep(10);
 599                         msec -= 10;
 600                         pci_read_config_dword(pdev, offset, &cap);
 601                 }
 602         }
 603
 604         if (cap & EHCI_USBLEGSUP_BIOS) {
 605                 /* well, possibly buggy BIOS... try to shut it down,
 606                  * and hope nothing goes too wrong
 607                  */
 608                 if (try_handoff)
 609                         dev_warn(&pdev->dev, "EHCI: BIOS handoff failed"
 610                                  " (BIOS bug?) %08x\n", cap);
 611                 pci_write_config_byte(pdev, offset + 2, 0);
 612         }
 613
 614         /* just in case, always disable EHCI SMIs */
 615         pci_write_config_dword(pdev, offset + EHCI_USBLEGCTLSTS, 0);
 616
 617         /* If the BIOS ever owned the controller then we can't expect
 618          * any power sessions to remain intact.
 619          */
 620         if (tried_handoff)
 621                 writel(0, op_reg_base + EHCI_CONFIGFLAG);
 622 }
 623
 624 static void __devinit quirk_usb_disable_ehci(struct pci_dev *pdev)
 625 {
 626         void __iomem *base, *op_reg_base;
 627         u32     hcc_params, cap, val;
 628         u8      offset, cap_length;
 629         int     wait_time, delta, count = 256/4;
 630
 631         if (!mmio_resource_enabled(pdev, 0))
 632                 return;
 633
 634         base = pci_ioremap_bar(pdev, 0);
 635         if (base == NULL)
 636                 return;
 637
 638         cap_length = readb(base);
 639         op_reg_base = base + cap_length;
 640
 641         /* EHCI 0.96 and later may have "extended capabilities"
 642          * spec section 5.1 explains the bios handoff, e.g. for
 643          * booting from USB disk or using a usb keyboard
 644          */
 645         hcc_params = readl(base + EHCI_HCC_PARAMS);
 646         offset = (hcc_params >> 8) & 0xff;
 647         while (offset && --count) {
 648                 pci_read_config_dword(pdev, offset, &cap);
 649
 650                 switch (cap & 0xff) {
 651                 case 1:
 652                         ehci_bios_handoff(pdev, op_reg_base, cap, offset);
 653                         break;
 654                 case 0: /* Illegal reserved cap, set cap=0 so we exit */
 655                         cap = 0; /* then fallthrough... */
 656                 default:
 657                         dev_warn(&pdev->dev, "EHCI: unrecognized capability "
 658                                  "%02x\n", cap & 0xff);
 659                 }
 660                 offset = (cap >> 8) & 0xff;
 661         }
 662         if (!count)
 663                 dev_printk(KERN_DEBUG, &pdev->dev, "EHCI: capability loop?\n");
 664
 665         /*
 666          * halt EHCI & disable its interrupts in any case
 667          */
 668         val = readl(op_reg_base + EHCI_USBSTS);
 669         if ((val & EHCI_USBSTS_HALTED) == 0) {
 670                 val = readl(op_reg_base + EHCI_USBCMD);
 671                 val &= ~EHCI_USBCMD_RUN;
 672                 writel(val, op_reg_base + EHCI_USBCMD);
 673
 674                 wait_time = 2000;
 675                 delta = 100;
 676                 do {
 677                         writel(0x3f, op_reg_base + EHCI_USBSTS);
 678                         udelay(delta);
 679                         wait_time -= delta;
 680                         val = readl(op_reg_base + EHCI_USBSTS);
 681                         if ((val == ~(u32)0) || (val & EHCI_USBSTS_HALTED)) {
 682                                 break;
 683                         }
 684                 } while (wait_time > 0);
 685         }
 686         writel(0, op_reg_base + EHCI_USBINTR);
 687         writel(0x3f, op_reg_base + EHCI_USBSTS);
 688
 689         iounmap(base);
 690 }
 691
 692 /*
 693  * handshake - spin reading a register until handshake completes
 694  * @ptr: address of hc register to be read
 695  * @mask: bits to look at in result of read
 696  * @done: value of those bits when handshake succeeds
 697  * @wait_usec: timeout in microseconds
 698  * @delay_usec: delay in microseconds to wait between polling
 699  *
 700  * Polls a register every delay_usec microseconds.
 701  * Returns 0 when the mask bits have the value done.
 702  * Returns -ETIMEDOUT if this condition is not true after
 703  * wait_usec microseconds have passed.
 704  */
 705 static int handshake(void __iomem *ptr, u32 mask, u32 done,
 706                 int wait_usec, int delay_usec)
 707 {
 708         u32     result;
 709
 710         do {
 711                 result = readl(ptr);
 712                 result &= mask;
 713                 if (result == done)
 714                         return 0;
 715                 udelay(delay_usec);
 716                 wait_usec -= delay_usec;
 717         } while (wait_usec > 0);
 718         return -ETIMEDOUT;
 719 }
 720
 721 bool usb_is_intel_switchable_xhci(struct pci_dev *pdev)
 722 {
 723         return pdev->class == PCI_CLASS_SERIAL_USB_XHCI &&
 724                 pdev->vendor == PCI_VENDOR_ID_INTEL &&
 725                 pdev->device == PCI_DEVICE_ID_INTEL_PANTHERPOINT_XHCI;
 726 }
 727 EXPORT_SYMBOL_GPL(usb_is_intel_switchable_xhci);
 728
 729 /*
 730  * Intel's Panther Point chipset has two host controllers (EHCI and xHCI) that
 731  * share some number of ports.  These ports can be switched between either
 732  * controller.  Not all of the ports under the EHCI host controller may be
 733  * switchable.
 734  *
 735  * The ports should be switched over to xHCI before PCI probes for any device
 736  * start.  This avoids active devices under EHCI being disconnected during the
 737  * port switchover, which could cause loss of data on USB storage devices, or
 738  * failed boot when the root file system is on a USB mass storage device and is
 739  * enumerated under EHCI first.
 740  *
 741  * We write into the xHC's PCI configuration space in some Intel-specific
 742  * registers to switch the ports over.  The USB 3.0 terminations and the USB
 743  * 2.0 data wires are switched separately.  We want to enable the SuperSpeed
 744  * terminations before switching the USB 2.0 wires over, so that USB 3.0
 745  * devices connect at SuperSpeed, rather than at USB 2.0 speeds.
 746  */
 747 void usb_enable_xhci_ports(struct pci_dev *xhci_pdev)
 748 {
 749         u32             ports_available;
 750
 751         ports_available = 0xffffffff;
 752         /* Write USB3_PSSEN, the USB 3.0 Port SuperSpeed Enable
 753          * Register, to turn on SuperSpeed terminations for all
 754          * available ports.
 755          */
 756         pci_write_config_dword(xhci_pdev, USB_INTEL_USB3_PSSEN,
 757                         cpu_to_le32(ports_available));
 758
 759         pci_read_config_dword(xhci_pdev, USB_INTEL_USB3_PSSEN,
 760                         &ports_available);
 761         dev_dbg(&xhci_pdev->dev, "USB 3.0 ports that are now enabled "
 762                         "under xHCI: 0x%x\n", ports_available);
 763
 764         ports_available = 0xffffffff;
 765         /* Write XUSB2PR, the xHC USB 2.0 Port Routing Register, to
 766          * switch the USB 2.0 power and data lines over to the xHCI
 767          * host.
 768          */
 769         pci_write_config_dword(xhci_pdev, USB_INTEL_XUSB2PR,
 770                         cpu_to_le32(ports_available));
 771
 772         pci_read_config_dword(xhci_pdev, USB_INTEL_XUSB2PR,
 773                         &ports_available);
 774         dev_dbg(&xhci_pdev->dev, "USB 2.0 ports that are now switched over "
 775                         "to xHCI: 0x%x\n", ports_available);
 776 }
 777 EXPORT_SYMBOL_GPL(usb_enable_xhci_ports);
 778
 779 /**
 780  * PCI Quirks for xHCI.
 781  *
 782  * Takes care of the handoff between the Pre-OS (i.e. BIOS) and the OS.
 783  * It signals to the BIOS that the OS wants control of the host controller,
 784  * and then waits 5 seconds for the BIOS to hand over control.
 785  * If we timeout, assume the BIOS is broken and take control anyway.
 786  */
 787 static void __devinit quirk_usb_handoff_xhci(struct pci_dev *pdev)
 788 {
 789         void __iomem *base;
 790         int ext_cap_offset;
 791         void __iomem *op_reg_base;
 792         u32 val;
 793         int timeout;
 794
 795         if (!mmio_resource_enabled(pdev, 0))
 796                 return;
 797
 798         base = ioremap_nocache(pci_resource_start(pdev, 0),
 799                                 pci_resource_len(pdev, 0));
 800         if (base == NULL)
 801                 return;
 802
 803         /*
 804          * Find the Legacy Support Capability register -
 805          * this is optional for xHCI host controllers.
 806          */
 807         ext_cap_offset = xhci_find_next_cap_offset(base, XHCI_HCC_PARAMS_OFFSET);
 808         do {
 809                 if (!ext_cap_offset)
 810                         /* We've reached the end of the extended capabilities */
 811                         goto hc_init;
 812                 val = readl(base + ext_cap_offset);
 813                 if (XHCI_EXT_CAPS_ID(val) == XHCI_EXT_CAPS_LEGACY)
 814                         break;
 815                 ext_cap_offset = xhci_find_next_cap_offset(base, ext_cap_offset);
 816         } while (1);
 817
 818         /* If the BIOS owns the HC, signal that the OS wants it, and wait */
 819         if (val & XHCI_HC_BIOS_OWNED) {
 820                 writel(val | XHCI_HC_OS_OWNED, base + ext_cap_offset);
 821
 822                 /* Wait for 5 seconds with 10 microsecond polling interval */
 823                 timeout = handshake(base + ext_cap_offset, XHCI_HC_BIOS_OWNED,
 824                                 0, 5000, 10);
 825
 826                 /* Assume a buggy BIOS and take HC ownership anyway */
 827                 if (timeout) {
 828                         dev_warn(&pdev->dev, "xHCI BIOS handoff failed"
 829                                         " (BIOS bug ?) %08x\n", val);
 830                         writel(val & ~XHCI_HC_BIOS_OWNED, base + ext_cap_offset);
 831                 }
 832         }
 833
 834         /* Disable any BIOS SMIs */
 835         writel(XHCI_LEGACY_DISABLE_SMI,
 836                         base + ext_cap_offset + XHCI_LEGACY_CONTROL_OFFSET);
 837
 838         if (usb_is_intel_switchable_xhci(pdev))
 839                 usb_enable_xhci_ports(pdev);
 840 hc_init:
 841         op_reg_base = base + XHCI_HC_LENGTH(readl(base));
 842
 843         /* Wait for the host controller to be ready before writing any
 844          * operational or runtime registers.  Wait 5 seconds and no more.
 845          */
 846         timeout = handshake(op_reg_base + XHCI_STS_OFFSET, XHCI_STS_CNR, 0,
 847                         5000, 10);
 848         /* Assume a buggy HC and start HC initialization anyway */
 849         if (timeout) {
 850                 val = readl(op_reg_base + XHCI_STS_OFFSET);
 851                 dev_warn(&pdev->dev,
 852                                 "xHCI HW not ready after 5 sec (HC bug?) "
 853                                 "status = 0x%x\n", val);
 854         }
 855
 856         /* Send the halt and disable interrupts command */
 857         val = readl(op_reg_base + XHCI_CMD_OFFSET);
 858         val &= ~(XHCI_CMD_RUN | XHCI_IRQS);
 859         writel(val, op_reg_base + XHCI_CMD_OFFSET);
 860
 861         /* Wait for the HC to halt - poll every 125 usec (one microframe). */
 862         timeout = handshake(op_reg_base + XHCI_STS_OFFSET, XHCI_STS_HALT, 1,
 863                         XHCI_MAX_HALT_USEC, 125);
 864         if (timeout) {
 865                 val = readl(op_reg_base + XHCI_STS_OFFSET);
 866                 dev_warn(&pdev->dev,
 867                                 "xHCI HW did not halt within %d usec "
 868                                 "status = 0x%x\n", XHCI_MAX_HALT_USEC, val);
 869         }
 870
 871         iounmap(base);
 872 }
 873
 874 static void __devinit quirk_usb_early_handoff(struct pci_dev *pdev)
 875 {
 876         if (pdev->class == PCI_CLASS_SERIAL_USB_UHCI)
 877                 quirk_usb_handoff_uhci(pdev);
 878         else if (pdev->class == PCI_CLASS_SERIAL_USB_OHCI)
 879                 quirk_usb_handoff_ohci(pdev);
 880         else if (pdev->class == PCI_CLASS_SERIAL_USB_EHCI)
 881                 quirk_usb_disable_ehci(pdev);
 882         else if (pdev->class == PCI_CLASS_SERIAL_USB_XHCI)
 883                 quirk_usb_handoff_xhci(pdev);
 884 }
 885 DECLARE_PCI_FIXUP_FINAL(PCI_ANY_ID, PCI_ANY_ID, quirk_usb_early_handoff);