drivers/usb/host/ehci-hub.c

   1 /*
   2  * Copyright (C) 2001-2004 by David Brownell
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License as published by the
   6  * Free Software Foundation; either version 2 of the License, or (at your
   7  * option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  11  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software Foundation,
  16  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17  */
  18
  19 /* this file is part of ehci-hcd.c */
  20
  21 /*-------------------------------------------------------------------------*/
  22
  23 /*
  24  * EHCI Root Hub ... the nonsharable stuff
  25  *
  26  * Registers don't need cpu_to_le32, that happens transparently
  27  */
  28
  29 /*-------------------------------------------------------------------------*/
  30
  31 #ifdef  CONFIG_PM
  32
  33 static int ehci_bus_suspend (struct usb_hcd *hcd)
  34 {
  35         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
  36         int                     port;
  37         int                     mask;
  38
  39         if (time_before (jiffies, ehci->next_statechange))
  40                 msleep(5);
  41
  42         port = HCS_N_PORTS (ehci->hcs_params);
  43         spin_lock_irq (&ehci->lock);
  44
  45         /* stop schedules, clean any completed work */
  46         if (HC_IS_RUNNING(hcd->state)) {
  47                 ehci_quiesce (ehci);
  48                 hcd->state = HC_STATE_QUIESCING;
  49         }
  50         ehci->command = readl (&ehci->regs->command);
  51         if (ehci->reclaim)
  52                 ehci->reclaim_ready = 1;
  53         ehci_work(ehci);
  54
  55         /* Unlike other USB host controller types, EHCI doesn't have
  56          * any notion of "global" or bus-wide suspend.  The driver has
  57          * to manually suspend all the active unsuspended ports, and
  58          * then manually resume them in the bus_resume() routine.
  59          */
  60         ehci->bus_suspended = 0;
  61         while (port--) {
  62                 u32 __iomem     *reg = &ehci->regs->port_status [port];
  63                 u32             t1 = readl (reg) & ~PORT_RWC_BITS;
  64                 u32             t2 = t1;
  65
  66                 /* keep track of which ports we suspend */
  67                 if ((t1 & PORT_PE) && !(t1 & PORT_OWNER) &&
  68                                 !(t1 & PORT_SUSPEND)) {
  69                         t2 |= PORT_SUSPEND;
  70                         set_bit(port, &ehci->bus_suspended);
  71                 }
  72
  73                 /* enable remote wakeup on all ports */
  74                 if (device_may_wakeup(&hcd->self.root_hub->dev))
  75                         t2 |= PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E;
  76                 else
  77                         t2 &= ~(PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E);
  78
  79                 if (t1 != t2) {
  80                         ehci_vdbg (ehci, "port %d, %08x -> %08x\n",
  81                                 port + 1, t1, t2);
  82                         writel (t2, reg);
  83                 }
  84         }
  85
  86         /* turn off now-idle HC */
  87         del_timer_sync (&ehci->watchdog);
  88         ehci_halt (ehci);
  89         hcd->state = HC_STATE_SUSPENDED;
  90
  91         /* allow remote wakeup */
  92         mask = INTR_MASK;
  93         if (!device_may_wakeup(&hcd->self.root_hub->dev))
  94                 mask &= ~STS_PCD;
  95         writel(mask, &ehci->regs->intr_enable);
  96         readl(&ehci->regs->intr_enable);
  97
  98         ehci->next_statechange = jiffies + msecs_to_jiffies(10);
  99         spin_unlock_irq (&ehci->lock);
 100         return 0;
 101 }
 102
 103
 104 /* caller has locked the root hub, and should reset/reinit on error */
 105 static int ehci_bus_resume (struct usb_hcd *hcd)
 106 {
 107         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 108         u32                     temp;
 109         int                     i;
 110
 111         if (time_before (jiffies, ehci->next_statechange))
 112                 msleep(5);
 113         spin_lock_irq (&ehci->lock);
 114
 115         /* Ideally and we've got a real resume here, and no port's power
 116          * was lost.  (For PCI, that means Vaux was maintained.)  But we
 117          * could instead be restoring a swsusp snapshot -- so that BIOS was
 118          * the last user of the controller, not reset/pm hardware keeping
 119          * state we gave to it.
 120          */
 121         temp = readl(&ehci->regs->intr_enable);
 122         ehci_dbg(ehci, "resume root hub%s\n", temp ? "" : " after power loss");
 123
 124         /* at least some APM implementations will try to deliver
 125          * IRQs right away, so delay them until we're ready.
 126          */
 127         writel(0, &ehci->regs->intr_enable);
 128
 129         /* re-init operational registers */
 130         writel(0, &ehci->regs->segment);
 131         writel(ehci->periodic_dma, &ehci->regs->frame_list);
 132         writel((u32) ehci->async->qh_dma, &ehci->regs->async_next);
 133
 134         /* restore CMD_RUN, framelist size, and irq threshold */
 135         writel (ehci->command, &ehci->regs->command);
 136
 137         /* Some controller/firmware combinations need a delay during which
 138          * they set up the port statuses.  See Bugzilla #8190. */
 139         mdelay(8);
 140
 141         /* manually resume the ports we suspended during bus_suspend() */
 142         i = HCS_N_PORTS (ehci->hcs_params);
 143         while (i--) {
 144                 temp = readl (&ehci->regs->port_status [i]);
 145                 temp &= ~(PORT_RWC_BITS
 146                         | PORT_WKOC_E | PORT_WKDISC_E | PORT_WKCONN_E);
 147                 if (test_bit(i, &ehci->bus_suspended) &&
 148                                 (temp & PORT_SUSPEND)) {
 149                         ehci->reset_done [i] = jiffies + msecs_to_jiffies (20);
 150                         temp |= PORT_RESUME;
 151                 }
 152                 writel (temp, &ehci->regs->port_status [i]);
 153         }
 154         i = HCS_N_PORTS (ehci->hcs_params);
 155         mdelay (20);
 156         while (i--) {
 157                 temp = readl (&ehci->regs->port_status [i]);
 158                 if (test_bit(i, &ehci->bus_suspended) &&
 159                                 (temp & PORT_SUSPEND)) {
 160                         temp &= ~(PORT_RWC_BITS | PORT_RESUME);
 161                         writel (temp, &ehci->regs->port_status [i]);
 162                         ehci_vdbg (ehci, "resumed port %d\n", i + 1);
 163                 }
 164         }
 165         (void) readl (&ehci->regs->command);
 166
 167         /* maybe re-activate the schedule(s) */
 168         temp = 0;
 169         if (ehci->async->qh_next.qh)
 170                 temp |= CMD_ASE;
 171         if (ehci->periodic_sched)
 172                 temp |= CMD_PSE;
 173         if (temp) {
 174                 ehci->command |= temp;
 175                 writel (ehci->command, &ehci->regs->command);
 176         }
 177
 178         ehci->next_statechange = jiffies + msecs_to_jiffies(5);
 179         hcd->state = HC_STATE_RUNNING;
 180
 181         /* Now we can safely re-enable irqs */
 182         writel(INTR_MASK, &ehci->regs->intr_enable);
 183
 184         spin_unlock_irq (&ehci->lock);
 185         return 0;
 186 }
 187
 188 #else
 189
 190 #define ehci_bus_suspend        NULL
 191 #define ehci_bus_resume         NULL
 192
 193 #endif  /* CONFIG_PM */
 194
 195 /*-------------------------------------------------------------------------*/
 196
 197 static int check_reset_complete (
 198         struct ehci_hcd *ehci,
 199         int             index,
 200         int             port_status
 201 ) {
 202         if (!(port_status & PORT_CONNECT)) {
 203                 ehci->reset_done [index] = 0;
 204                 return port_status;
 205         }
 206
 207         /* if reset finished and it's still not enabled -- handoff */
 208         if (!(port_status & PORT_PE)) {
 209
 210                 /* with integrated TT, there's nobody to hand it to! */
 211                 if (ehci_is_TDI(ehci)) {
 212                         ehci_dbg (ehci,
 213                                 "Failed to enable port %d on root hub TT\n",
 214                                 index+1);
 215                         return port_status;
 216                 }
 217
 218                 ehci_dbg (ehci, "port %d full speed --> companion\n",
 219                         index + 1);
 220
 221                 // what happens if HCS_N_CC(params) == 0 ?
 222                 port_status |= PORT_OWNER;
 223                 port_status &= ~PORT_RWC_BITS;
 224                 writel (port_status, &ehci->regs->port_status [index]);
 225
 226         } else
 227                 ehci_dbg (ehci, "port %d high speed\n", index + 1);
 228
 229         return port_status;
 230 }
 231
 232 /*-------------------------------------------------------------------------*/
 233
 234
 235 /* build "status change" packet (one or two bytes) from HC registers */
 236
 237 static int
 238 ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
 239 {
 240         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 241         u32             temp, status = 0;
 242         u32             mask;
 243         int             ports, i, retval = 1;
 244         unsigned long   flags;
 245
 246         /* if !USB_SUSPEND, root hub timers won't get shut down ... */
 247         if (!HC_IS_RUNNING(hcd->state))
 248                 return 0;
 249
 250         /* init status to no-changes */
 251         buf [0] = 0;
 252         ports = HCS_N_PORTS (ehci->hcs_params);
 253         if (ports > 7) {
 254                 buf [1] = 0;
 255                 retval++;
 256         }
 257
 258         /* Some boards (mostly VIA?) report bogus overcurrent indications,
 259          * causing massive log spam unless we completely ignore them.  It
 260          * may be relevant that VIA VT8235 controlers, where PORT_POWER is
 261          * always set, seem to clear PORT_OCC and PORT_CSC when writing to
 262          * PORT_POWER; that's surprising, but maybe within-spec.
 263          */
 264         if (!ignore_oc)
 265                 mask = PORT_CSC | PORT_PEC | PORT_OCC;
 266         else
 267                 mask = PORT_CSC | PORT_PEC;
 268         // PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
 269
 270         /* no hub change reports (bit 0) for now (power, ...) */
 271
 272         /* port N changes (bit N)? */
 273         spin_lock_irqsave (&ehci->lock, flags);
 274         for (i = 0; i < ports; i++) {
 275                 temp = readl (&ehci->regs->port_status [i]);
 276                 if (temp & PORT_OWNER) {
 277                         /* don't report this in GetPortStatus */
 278                         if (temp & PORT_CSC) {
 279                                 temp &= ~PORT_RWC_BITS;
 280                                 temp |= PORT_CSC;
 281                                 writel (temp, &ehci->regs->port_status [i]);
 282                         }
 283                         continue;
 284                 }
 285                 if (!(temp & PORT_CONNECT))
 286                         ehci->reset_done [i] = 0;
 287                 if ((temp & mask) != 0
 288                                 || ((temp & PORT_RESUME) != 0
 289                                         && time_after (jiffies,
 290                                                 ehci->reset_done [i]))) {
 291                         if (i < 7)
 292                             buf [0] |= 1 << (i + 1);
 293                         else
 294                             buf [1] |= 1 << (i - 7);
 295                         status = STS_PCD;
 296                 }
 297         }
 298         /* FIXME autosuspend idle root hubs */
 299         spin_unlock_irqrestore (&ehci->lock, flags);
 300         return status ? retval : 0;
 301 }
 302
 303 /*-------------------------------------------------------------------------*/
 304
 305 static void
 306 ehci_hub_descriptor (
 307         struct ehci_hcd                 *ehci,
 308         struct usb_hub_descriptor       *desc
 309 ) {
 310         int             ports = HCS_N_PORTS (ehci->hcs_params);
 311         u16             temp;
 312
 313         desc->bDescriptorType = 0x29;
 314         desc->bPwrOn2PwrGood = 10;      /* ehci 1.0, 2.3.9 says 20ms max */
 315         desc->bHubContrCurrent = 0;
 316
 317         desc->bNbrPorts = ports;
 318         temp = 1 + (ports / 8);
 319         desc->bDescLength = 7 + 2 * temp;
 320
 321         /* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
 322         memset (&desc->bitmap [0], 0, temp);
 323         memset (&desc->bitmap [temp], 0xff, temp);
 324
 325         temp = 0x0008;                  /* per-port overcurrent reporting */
 326         if (HCS_PPC (ehci->hcs_params))
 327                 temp |= 0x0001;         /* per-port power control */
 328         else
 329                 temp |= 0x0002;         /* no power switching */
 330 #if 0
 331 // re-enable when we support USB_PORT_FEAT_INDICATOR below.
 332         if (HCS_INDICATOR (ehci->hcs_params))
 333                 temp |= 0x0080;         /* per-port indicators (LEDs) */
 334 #endif
 335         desc->wHubCharacteristics = (__force __u16)cpu_to_le16 (temp);
 336 }
 337
 338 /*-------------------------------------------------------------------------*/
 339
 340 #define PORT_WAKE_BITS  (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
 341
 342 static int ehci_hub_control (
 343         struct usb_hcd  *hcd,
 344         u16             typeReq,
 345         u16             wValue,
 346         u16             wIndex,
 347         char            *buf,
 348         u16             wLength
 349 ) {
 350         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 351         int             ports = HCS_N_PORTS (ehci->hcs_params);
 352         u32             temp, status;
 353         unsigned long   flags;
 354         int             retval = 0;
 355         unsigned        selector;
 356
 357         /*
 358          * FIXME:  support SetPortFeatures USB_PORT_FEAT_INDICATOR.
 359          * HCS_INDICATOR may say we can change LEDs to off/amber/green.
 360          * (track current state ourselves) ... blink for diagnostics,
 361          * power, "this is the one", etc.  EHCI spec supports this.
 362          */
 363
 364         spin_lock_irqsave (&ehci->lock, flags);
 365         switch (typeReq) {
 366         case ClearHubFeature:
 367                 switch (wValue) {
 368                 case C_HUB_LOCAL_POWER:
 369                 case C_HUB_OVER_CURRENT:
 370                         /* no hub-wide feature/status flags */
 371                         break;
 372                 default:
 373                         goto error;
 374                 }
 375                 break;
 376         case ClearPortFeature:
 377                 if (!wIndex || wIndex > ports)
 378                         goto error;
 379                 wIndex--;
 380                 temp = readl (&ehci->regs->port_status [wIndex]);
 381                 if (temp & PORT_OWNER)
 382                         break;
 383
 384                 switch (wValue) {
 385                 case USB_PORT_FEAT_ENABLE:
 386                         writel (temp & ~PORT_PE,
 387                                 &ehci->regs->port_status [wIndex]);
 388                         break;
 389                 case USB_PORT_FEAT_C_ENABLE:
 390                         writel((temp & ~PORT_RWC_BITS) | PORT_PEC,
 391                                 &ehci->regs->port_status [wIndex]);
 392                         break;
 393                 case USB_PORT_FEAT_SUSPEND:
 394                         if (temp & PORT_RESET)
 395                                 goto error;
 396                         if (ehci->no_selective_suspend)
 397                                 break;
 398                         if (temp & PORT_SUSPEND) {
 399                                 if ((temp & PORT_PE) == 0)
 400                                         goto error;
 401                                 /* resume signaling for 20 msec */
 402                                 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
 403                                 writel (temp | PORT_RESUME,
 404                                         &ehci->regs->port_status [wIndex]);
 405                                 ehci->reset_done [wIndex] = jiffies
 406                                                 + msecs_to_jiffies (20);
 407                         }
 408                         break;
 409                 case USB_PORT_FEAT_C_SUSPEND:
 410                         /* we auto-clear this feature */
 411                         break;
 412                 case USB_PORT_FEAT_POWER:
 413                         if (HCS_PPC (ehci->hcs_params))
 414                                 writel (temp & ~(PORT_RWC_BITS | PORT_POWER),
 415                                         &ehci->regs->port_status [wIndex]);
 416                         break;
 417                 case USB_PORT_FEAT_C_CONNECTION:
 418                         writel((temp & ~PORT_RWC_BITS) | PORT_CSC,
 419                                 &ehci->regs->port_status [wIndex]);
 420                         break;
 421                 case USB_PORT_FEAT_C_OVER_CURRENT:
 422                         writel((temp & ~PORT_RWC_BITS) | PORT_OCC,
 423                                 &ehci->regs->port_status [wIndex]);
 424                         break;
 425                 case USB_PORT_FEAT_C_RESET:
 426                         /* GetPortStatus clears reset */
 427                         break;
 428                 default:
 429                         goto error;
 430                 }
 431                 readl (&ehci->regs->command);   /* unblock posted write */
 432                 break;
 433         case GetHubDescriptor:
 434                 ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
 435                         buf);
 436                 break;
 437         case GetHubStatus:
 438                 /* no hub-wide feature/status flags */
 439                 memset (buf, 0, 4);
 440                 //cpu_to_le32s ((u32 *) buf);
 441                 break;
 442         case GetPortStatus:
 443                 if (!wIndex || wIndex > ports)
 444                         goto error;
 445                 wIndex--;
 446                 status = 0;
 447                 temp = readl (&ehci->regs->port_status [wIndex]);
 448
 449                 // wPortChange bits
 450                 if (temp & PORT_CSC)
 451                         status |= 1 << USB_PORT_FEAT_C_CONNECTION;
 452                 if (temp & PORT_PEC)
 453                         status |= 1 << USB_PORT_FEAT_C_ENABLE;
 454                 if ((temp & PORT_OCC) && !ignore_oc)
 455                         status |= 1 << USB_PORT_FEAT_C_OVER_CURRENT;
 456
 457                 /* whoever resumes must GetPortStatus to complete it!! */
 458                 if ((temp & PORT_RESUME)
 459                                 && time_after (jiffies,
 460                                         ehci->reset_done [wIndex])) {
 461                         status |= 1 << USB_PORT_FEAT_C_SUSPEND;
 462                         ehci->reset_done [wIndex] = 0;
 463
 464                         /* stop resume signaling */
 465                         temp = readl (&ehci->regs->port_status [wIndex]);
 466                         writel (temp & ~(PORT_RWC_BITS | PORT_RESUME),
 467                                 &ehci->regs->port_status [wIndex]);
 468                         retval = handshake (
 469                                         &ehci->regs->port_status [wIndex],
 470                                         PORT_RESUME, 0, 2000 /* 2msec */);
 471                         if (retval != 0) {
 472                                 ehci_err (ehci, "port %d resume error %d\n",
 473                                         wIndex + 1, retval);
 474                                 goto error;
 475                         }
 476                         temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10));
 477                 }
 478
 479                 /* whoever resets must GetPortStatus to complete it!! */
 480                 if ((temp & PORT_RESET)
 481                                 && time_after (jiffies,
 482                                         ehci->reset_done [wIndex])) {
 483                         status |= 1 << USB_PORT_FEAT_C_RESET;
 484                         ehci->reset_done [wIndex] = 0;
 485
 486                         /* force reset to complete */
 487                         writel (temp & ~(PORT_RWC_BITS | PORT_RESET),
 488                                         &ehci->regs->port_status [wIndex]);
 489                         /* REVISIT:  some hardware needs 550+ usec to clear
 490                          * this bit; seems too long to spin routinely...
 491                          */
 492                         retval = handshake (
 493                                         &ehci->regs->port_status [wIndex],
 494                                         PORT_RESET, 0, 750);
 495                         if (retval != 0) {
 496                                 ehci_err (ehci, "port %d reset error %d\n",
 497                                         wIndex + 1, retval);
 498                                 goto error;
 499                         }
 500
 501                         /* see what we found out */
 502                         temp = check_reset_complete (ehci, wIndex,
 503                                 readl (&ehci->regs->port_status [wIndex]));
 504                 }
 505
 506                 // don't show wPortStatus if it's owned by a companion hc
 507                 if (!(temp & PORT_OWNER)) {
 508                         if (temp & PORT_CONNECT) {
 509                                 status |= 1 << USB_PORT_FEAT_CONNECTION;
 510                                 // status may be from integrated TT
 511                                 status |= ehci_port_speed(ehci, temp);
 512                         }
 513                         if (temp & PORT_PE)
 514                                 status |= 1 << USB_PORT_FEAT_ENABLE;
 515                         if (temp & (PORT_SUSPEND|PORT_RESUME))
 516                                 status |= 1 << USB_PORT_FEAT_SUSPEND;
 517                         if (temp & PORT_OC)
 518                                 status |= 1 << USB_PORT_FEAT_OVER_CURRENT;
 519                         if (temp & PORT_RESET)
 520                                 status |= 1 << USB_PORT_FEAT_RESET;
 521                         if (temp & PORT_POWER)
 522                                 status |= 1 << USB_PORT_FEAT_POWER;
 523                 }
 524
 525 #ifndef EHCI_VERBOSE_DEBUG
 526         if (status & ~0xffff)   /* only if wPortChange is interesting */
 527 #endif
 528                 dbg_port (ehci, "GetStatus", wIndex + 1, temp);
 529                 // we "know" this alignment is good, caller used kmalloc()...
 530                 *((__le32 *) buf) = cpu_to_le32 (status);
 531                 break;
 532         case SetHubFeature:
 533                 switch (wValue) {
 534                 case C_HUB_LOCAL_POWER:
 535                 case C_HUB_OVER_CURRENT:
 536                         /* no hub-wide feature/status flags */
 537                         break;
 538                 default:
 539                         goto error;
 540                 }
 541                 break;
 542         case SetPortFeature:
 543                 selector = wIndex >> 8;
 544                 wIndex &= 0xff;
 545                 if (!wIndex || wIndex > ports)
 546                         goto error;
 547                 wIndex--;
 548                 temp = readl (&ehci->regs->port_status [wIndex]);
 549                 if (temp & PORT_OWNER)
 550                         break;
 551
 552                 temp &= ~PORT_RWC_BITS;
 553                 switch (wValue) {
 554                 case USB_PORT_FEAT_SUSPEND:
 555                         if (ehci->no_selective_suspend)
 556                                 break;
 557                         if ((temp & PORT_PE) == 0
 558                                         || (temp & PORT_RESET) != 0)
 559                                 goto error;
 560                         if (device_may_wakeup(&hcd->self.root_hub->dev))
 561                                 temp |= PORT_WAKE_BITS;
 562                         writel (temp | PORT_SUSPEND,
 563                                 &ehci->regs->port_status [wIndex]);
 564                         break;
 565                 case USB_PORT_FEAT_POWER:
 566                         if (HCS_PPC (ehci->hcs_params))
 567                                 writel (temp | PORT_POWER,
 568                                         &ehci->regs->port_status [wIndex]);
 569                         break;
 570                 case USB_PORT_FEAT_RESET:
 571                         if (temp & PORT_RESUME)
 572                                 goto error;
 573                         /* line status bits may report this as low speed,
 574                          * which can be fine if this root hub has a
 575                          * transaction translator built in.
 576                          */
 577                         if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
 578                                         && !ehci_is_TDI(ehci)
 579                                         && PORT_USB11 (temp)) {
 580                                 ehci_dbg (ehci,
 581                                         "port %d low speed --> companion\n",
 582                                         wIndex + 1);
 583                                 temp |= PORT_OWNER;
 584                         } else {
 585                                 ehci_vdbg (ehci, "port %d reset\n", wIndex + 1);
 586                                 temp |= PORT_RESET;
 587                                 temp &= ~PORT_PE;
 588
 589                                 /*
 590                                  * caller must wait, then call GetPortStatus
 591                                  * usb 2.0 spec says 50 ms resets on root
 592                                  */
 593                                 ehci->reset_done [wIndex] = jiffies
 594                                                 + msecs_to_jiffies (50);
 595                         }
 596                         writel (temp, &ehci->regs->port_status [wIndex]);
 597                         break;
 598
 599                 /* For downstream facing ports (these):  one hub port is put
 600                  * into test mode according to USB2 11.24.2.13, then the hub
 601                  * must be reset (which for root hub now means rmmod+modprobe,
 602                  * or else system reboot).  See EHCI 2.3.9 and 4.14 for info
 603                  * about the EHCI-specific stuff.
 604                  */
 605                 case USB_PORT_FEAT_TEST:
 606                         if (!selector || selector > 5)
 607                                 goto error;
 608                         ehci_quiesce(ehci);
 609                         ehci_halt(ehci);
 610                         temp |= selector << 16;
 611                         writel (temp, &ehci->regs->port_status [wIndex]);
 612                         break;
 613
 614                 default:
 615                         goto error;
 616                 }
 617                 readl (&ehci->regs->command);   /* unblock posted writes */
 618                 break;
 619
 620         default:
 621 error:
 622                 /* "stall" on error */
 623                 retval = -EPIPE;
 624         }
 625         spin_unlock_irqrestore (&ehci->lock, flags);
 626         return retval;
 627 }