drivers/usb/host/ehci-pci.c

   1 /*
   2  * EHCI HCD (Host Controller Driver) PCI Bus Glue.
   3  *
   4  * Copyright (c) 2000-2004 by David Brownell
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; either version 2 of the License, or (at your
   9  * option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  13  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 #ifndef CONFIG_PCI
  22 #error "This file is PCI bus glue.  CONFIG_PCI must be defined."
  23 #endif
  24
  25 /*-------------------------------------------------------------------------*/
  26
  27 /* called after powerup, by probe or system-pm "wakeup" */
  28 static int ehci_pci_reinit(struct ehci_hcd *ehci, struct pci_dev *pdev)
  29 {
  30         u32                     temp;
  31         int                     retval;
  32
  33         /* optional debug port, normally in the first BAR */
  34         temp = pci_find_capability(pdev, 0x0a);
  35         if (temp) {
  36                 pci_read_config_dword(pdev, temp, &temp);
  37                 temp >>= 16;
  38                 if ((temp & (3 << 13)) == (1 << 13)) {
  39                         temp &= 0x1fff;
  40                         ehci->debug = ehci_to_hcd(ehci)->regs + temp;
  41                         temp = ehci_readl(ehci, &ehci->debug->control);
  42                         ehci_info(ehci, "debug port %d%s\n",
  43                                 HCS_DEBUG_PORT(ehci->hcs_params),
  44                                 (temp & DBGP_ENABLED)
  45                                         ? " IN USE"
  46                                         : "");
  47                         if (!(temp & DBGP_ENABLED))
  48                                 ehci->debug = NULL;
  49                 }
  50         }
  51
  52         /* we expect static quirk code to handle the "extended capabilities"
  53          * (currently just BIOS handoff) allowed starting with EHCI 0.96
  54          */
  55
  56         /* PCI Memory-Write-Invalidate cycle support is optional (uncommon) */
  57         retval = pci_set_mwi(pdev);
  58         if (!retval)
  59                 ehci_dbg(ehci, "MWI active\n");
  60
  61         return 0;
  62 }
  63
  64 /* called during probe() after chip reset completes */
  65 static int ehci_pci_setup(struct usb_hcd *hcd)
  66 {
  67         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
  68         struct pci_dev          *pdev = to_pci_dev(hcd->self.controller);
  69         struct pci_dev          *p_smbus;
  70         u8                      rev;
  71         u32                     temp;
  72         int                     retval;
  73
  74         switch (pdev->vendor) {
  75         case PCI_VENDOR_ID_TOSHIBA_2:
  76                 /* celleb's companion chip */
  77                 if (pdev->device == 0x01b5) {
  78 #ifdef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
  79                         ehci->big_endian_mmio = 1;
  80 #else
  81                         ehci_warn(ehci,
  82                                   "unsupported big endian Toshiba quirk\n");
  83 #endif
  84                 }
  85                 break;
  86         }
  87
  88         ehci->caps = hcd->regs;
  89         ehci->regs = hcd->regs +
  90                 HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
  91
  92         dbg_hcs_params(ehci, "reset");
  93         dbg_hcc_params(ehci, "reset");
  94
  95         /* ehci_init() causes memory for DMA transfers to be
  96          * allocated.  Thus, any vendor-specific workarounds based on
  97          * limiting the type of memory used for DMA transfers must
  98          * happen before ehci_init() is called. */
  99         switch (pdev->vendor) {
 100         case PCI_VENDOR_ID_NVIDIA:
 101                 /* NVidia reports that certain chips don't handle
 102                  * QH, ITD, or SITD addresses above 2GB.  (But TD,
 103                  * data buffer, and periodic schedule are normal.)
 104                  */
 105                 switch (pdev->device) {
 106                 case 0x003c:    /* MCP04 */
 107                 case 0x005b:    /* CK804 */
 108                 case 0x00d8:    /* CK8 */
 109                 case 0x00e8:    /* CK8S */
 110                         if (pci_set_consistent_dma_mask(pdev,
 111                                                 DMA_BIT_MASK(31)) < 0)
 112                                 ehci_warn(ehci, "can't enable NVidia "
 113                                         "workaround for >2GB RAM\n");
 114                         break;
 115                 }
 116                 break;
 117         }
 118
 119         /* cache this readonly data; minimize chip reads */
 120         ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
 121
 122         retval = ehci_halt(ehci);
 123         if (retval)
 124                 return retval;
 125
 126         /* data structure init */
 127         retval = ehci_init(hcd);
 128         if (retval)
 129                 return retval;
 130
 131         switch (pdev->vendor) {
 132         case PCI_VENDOR_ID_INTEL:
 133                 ehci->need_io_watchdog = 0;
 134                 break;
 135         case PCI_VENDOR_ID_TDI:
 136                 if (pdev->device == PCI_DEVICE_ID_TDI_EHCI) {
 137                         hcd->has_tt = 1;
 138                         tdi_reset(ehci);
 139                 }
 140                 break;
 141         case PCI_VENDOR_ID_AMD:
 142                 /* AMD8111 EHCI doesn't work, according to AMD errata */
 143                 if (pdev->device == 0x7463) {
 144                         ehci_info(ehci, "ignoring AMD8111 (errata)\n");
 145                         retval = -EIO;
 146                         goto done;
 147                 }
 148                 break;
 149         case PCI_VENDOR_ID_NVIDIA:
 150                 switch (pdev->device) {
 151                 /* Some NForce2 chips have problems with selective suspend;
 152                  * fixed in newer silicon.
 153                  */
 154                 case 0x0068:
 155                         if (pdev->revision < 0xa4)
 156                                 ehci->no_selective_suspend = 1;
 157                         break;
 158                 }
 159                 break;
 160         case PCI_VENDOR_ID_VIA:
 161                 if (pdev->device == 0x3104 && (pdev->revision & 0xf0) == 0x60) {
 162                         u8 tmp;
 163
 164                         /* The VT6212 defaults to a 1 usec EHCI sleep time which
 165                          * hogs the PCI bus *badly*. Setting bit 5 of 0x4B makes
 166                          * that sleep time use the conventional 10 usec.
 167                          */
 168                         pci_read_config_byte(pdev, 0x4b, &tmp);
 169                         if (tmp & 0x20)
 170                                 break;
 171                         pci_write_config_byte(pdev, 0x4b, tmp | 0x20);
 172                 }
 173                 break;
 174         case PCI_VENDOR_ID_ATI:
 175                 /* SB600 and old version of SB700 have a bug in EHCI controller,
 176                  * which causes usb devices lose response in some cases.
 177                  */
 178                 if ((pdev->device == 0x4386) || (pdev->device == 0x4396)) {
 179                         p_smbus = pci_get_device(PCI_VENDOR_ID_ATI,
 180                                                  PCI_DEVICE_ID_ATI_SBX00_SMBUS,
 181                                                  NULL);
 182                         if (!p_smbus)
 183                                 break;
 184                         rev = p_smbus->revision;
 185                         if ((pdev->device == 0x4386) || (rev == 0x3a)
 186                             || (rev == 0x3b)) {
 187                                 u8 tmp;
 188                                 ehci_info(ehci, "applying AMD SB600/SB700 USB "
 189                                         "freeze workaround\n");
 190                                 pci_read_config_byte(pdev, 0x53, &tmp);
 191                                 pci_write_config_byte(pdev, 0x53, tmp | (1<<3));
 192                         }
 193                         pci_dev_put(p_smbus);
 194                 }
 195                 break;
 196         }
 197
 198         ehci_reset(ehci);
 199
 200         /* at least the Genesys GL880S needs fixup here */
 201         temp = HCS_N_CC(ehci->hcs_params) * HCS_N_PCC(ehci->hcs_params);
 202         temp &= 0x0f;
 203         if (temp && HCS_N_PORTS(ehci->hcs_params) > temp) {
 204                 ehci_dbg(ehci, "bogus port configuration: "
 205                         "cc=%d x pcc=%d < ports=%d\n",
 206                         HCS_N_CC(ehci->hcs_params),
 207                         HCS_N_PCC(ehci->hcs_params),
 208                         HCS_N_PORTS(ehci->hcs_params));
 209
 210                 switch (pdev->vendor) {
 211                 case 0x17a0:            /* GENESYS */
 212                         /* GL880S: should be PORTS=2 */
 213                         temp |= (ehci->hcs_params & ~0xf);
 214                         ehci->hcs_params = temp;
 215                         break;
 216                 case PCI_VENDOR_ID_NVIDIA:
 217                         /* NF4: should be PCC=10 */
 218                         break;
 219                 }
 220         }
 221
 222         /* Serial Bus Release Number is at PCI 0x60 offset */
 223         pci_read_config_byte(pdev, 0x60, &ehci->sbrn);
 224
 225         /* Keep this around for a while just in case some EHCI
 226          * implementation uses legacy PCI PM support.  This test
 227          * can be removed on 17 Dec 2009 if the dev_warn() hasn't
 228          * been triggered by then.
 229          */
 230         if (!device_can_wakeup(&pdev->dev)) {
 231                 u16     port_wake;
 232
 233                 pci_read_config_word(pdev, 0x62, &port_wake);
 234                 if (port_wake & 0x0001) {
 235                         dev_warn(&pdev->dev, "Enabling legacy PCI PM\n");
 236                         device_set_wakeup_capable(&pdev->dev, 1);
 237                 }
 238         }
 239
 240 #ifdef  CONFIG_USB_SUSPEND
 241         /* REVISIT: the controller works fine for wakeup iff the root hub
 242          * itself is "globally" suspended, but usbcore currently doesn't
 243          * understand such things.
 244          *
 245          * System suspend currently expects to be able to suspend the entire
 246          * device tree, device-at-a-time.  If we failed selective suspend
 247          * reports, system suspend would fail; so the root hub code must claim
 248          * success.  That's lying to usbcore, and it matters for runtime
 249          * PM scenarios with selective suspend and remote wakeup...
 250          */
 251         if (ehci->no_selective_suspend && device_can_wakeup(&pdev->dev))
 252                 ehci_warn(ehci, "selective suspend/wakeup unavailable\n");
 253 #endif
 254
 255         ehci_port_power(ehci, 1);
 256         retval = ehci_pci_reinit(ehci, pdev);
 257 done:
 258         return retval;
 259 }
 260
 261 /*-------------------------------------------------------------------------*/
 262
 263 #ifdef  CONFIG_PM
 264
 265 /* suspend/resume, section 4.3 */
 266
 267 /* These routines rely on the PCI bus glue
 268  * to handle powerdown and wakeup, and currently also on
 269  * transceivers that don't need any software attention to set up
 270  * the right sort of wakeup.
 271  * Also they depend on separate root hub suspend/resume.
 272  */
 273
 274 static int ehci_pci_suspend(struct usb_hcd *hcd)
 275 {
 276         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
 277         unsigned long           flags;
 278         int                     rc = 0;
 279
 280         if (time_before(jiffies, ehci->next_statechange))
 281                 msleep(10);
 282
 283         /* Root hub was already suspended. Disable irq emission and
 284          * mark HW unaccessible, bail out if RH has been resumed. Use
 285          * the spinlock to properly synchronize with possible pending
 286          * RH suspend or resume activity.
 287          *
 288          * This is still racy as hcd->state is manipulated outside of
 289          * any locks =P But that will be a different fix.
 290          */
 291         spin_lock_irqsave (&ehci->lock, flags);
 292         if (hcd->state != HC_STATE_SUSPENDED) {
 293                 rc = -EINVAL;
 294                 goto bail;
 295         }
 296         ehci_writel(ehci, 0, &ehci->regs->intr_enable);
 297         (void)ehci_readl(ehci, &ehci->regs->intr_enable);
 298
 299         clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
 300  bail:
 301         spin_unlock_irqrestore (&ehci->lock, flags);
 302
 303         // could save FLADJ in case of Vaux power loss
 304         // ... we'd only use it to handle clock skew
 305
 306         return rc;
 307 }
 308
 309 static int ehci_pci_resume(struct usb_hcd *hcd, bool hibernated)
 310 {
 311         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
 312         struct pci_dev          *pdev = to_pci_dev(hcd->self.controller);
 313
 314         // maybe restore FLADJ
 315
 316         if (time_before(jiffies, ehci->next_statechange))
 317                 msleep(100);
 318
 319         /* Mark hardware accessible again as we are out of D3 state by now */
 320         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
 321
 322         /* If CF is still set and we aren't resuming from hibernation
 323          * then we maintained PCI Vaux power.
 324          * Just undo the effect of ehci_pci_suspend().
 325          */
 326         if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF &&
 327                                 !hibernated) {
 328                 int     mask = INTR_MASK;
 329
 330                 if (!hcd->self.root_hub->do_remote_wakeup)
 331                         mask &= ~STS_PCD;
 332                 ehci_writel(ehci, mask, &ehci->regs->intr_enable);
 333                 ehci_readl(ehci, &ehci->regs->intr_enable);
 334                 return 0;
 335         }
 336
 337         usb_root_hub_lost_power(hcd->self.root_hub);
 338
 339         /* Else reset, to cope with power loss or flush-to-storage
 340          * style "resume" having let BIOS kick in during reboot.
 341          */
 342         (void) ehci_halt(ehci);
 343         (void) ehci_reset(ehci);
 344         (void) ehci_pci_reinit(ehci, pdev);
 345
 346         /* emptying the schedule aborts any urbs */
 347         spin_lock_irq(&ehci->lock);
 348         if (ehci->reclaim)
 349                 end_unlink_async(ehci);
 350         ehci_work(ehci);
 351         spin_unlock_irq(&ehci->lock);
 352
 353         ehci_writel(ehci, ehci->command, &ehci->regs->command);
 354         ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
 355         ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
 356
 357         /* here we "know" root ports should always stay powered */
 358         ehci_port_power(ehci, 1);
 359
 360         hcd->state = HC_STATE_SUSPENDED;
 361         return 0;
 362 }
 363 #endif
 364
 365 static const struct hc_driver ehci_pci_hc_driver = {
 366         .description =          hcd_name,
 367         .product_desc =         "EHCI Host Controller",
 368         .hcd_priv_size =        sizeof(struct ehci_hcd),
 369
 370         /*
 371          * generic hardware linkage
 372          */
 373         .irq =                  ehci_irq,
 374         .flags =                HCD_MEMORY | HCD_USB2,
 375
 376         /*
 377          * basic lifecycle operations
 378          */
 379         .reset =                ehci_pci_setup,
 380         .start =                ehci_run,
 381 #ifdef  CONFIG_PM
 382         .pci_suspend =          ehci_pci_suspend,
 383         .pci_resume =           ehci_pci_resume,
 384 #endif
 385         .stop =                 ehci_stop,
 386         .shutdown =             ehci_shutdown,
 387
 388         /*
 389          * managing i/o requests and associated device resources
 390          */
 391         .urb_enqueue =          ehci_urb_enqueue,
 392         .urb_dequeue =          ehci_urb_dequeue,
 393         .endpoint_disable =     ehci_endpoint_disable,
 394         .endpoint_reset =       ehci_endpoint_reset,
 395
 396         /*
 397          * scheduling support
 398          */
 399         .get_frame_number =     ehci_get_frame,
 400
 401         /*
 402          * root hub support
 403          */
 404         .hub_status_data =      ehci_hub_status_data,
 405         .hub_control =          ehci_hub_control,
 406         .bus_suspend =          ehci_bus_suspend,
 407         .bus_resume =           ehci_bus_resume,
 408         .relinquish_port =      ehci_relinquish_port,
 409         .port_handed_over =     ehci_port_handed_over,
 410
 411         .clear_tt_buffer_complete       = ehci_clear_tt_buffer_complete,
 412 };
 413
 414 /*-------------------------------------------------------------------------*/
 415
 416 /* PCI driver selection metadata; PCI hotplugging uses this */
 417 static const struct pci_device_id pci_ids [] = { {
 418         /* handle any USB 2.0 EHCI controller */
 419         PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_USB_EHCI, ~0),
 420         .driver_data =  (unsigned long) &ehci_pci_hc_driver,
 421         },
 422         { /* end: all zeroes */ }
 423 };
 424 MODULE_DEVICE_TABLE(pci, pci_ids);
 425
 426 /* pci driver glue; this is a "new style" PCI driver module */
 427 static struct pci_driver ehci_pci_driver = {
 428         .name =         (char *) hcd_name,
 429         .id_table =     pci_ids,
 430
 431         .probe =        usb_hcd_pci_probe,
 432         .remove =       usb_hcd_pci_remove,
 433         .shutdown =     usb_hcd_pci_shutdown,
 434
 435 #ifdef CONFIG_PM_SLEEP
 436         .driver =       {
 437                 .pm =   &usb_hcd_pci_pm_ops
 438         },
 439 #endif
 440 };