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 = ehci_readl(ehci, &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 = ehci_readl(ehci, 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                         ehci_writel(ehci, 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         ehci_writel(ehci, mask, &ehci->regs->intr_enable);
  96         ehci_readl(ehci, &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 = ehci_readl(ehci, &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         ehci_writel(ehci, 0, &ehci->regs->intr_enable);
 128
 129         /* re-init operational registers */
 130         ehci_writel(ehci, 0, &ehci->regs->segment);
 131         ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
 132         ehci_writel(ehci, (u32) ehci->async->qh_dma, &ehci->regs->async_next);
 133
 134         /* restore CMD_RUN, framelist size, and irq threshold */
 135         ehci_writel(ehci, ehci->command, &ehci->regs->command);
 136
 137         /* manually resume the ports we suspended during bus_suspend() */
 138         i = HCS_N_PORTS (ehci->hcs_params);
 139         while (i--) {
 140                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 141                 temp &= ~(PORT_RWC_BITS
 142                         | PORT_WKOC_E | PORT_WKDISC_E | PORT_WKCONN_E);
 143                 if (test_bit(i, &ehci->bus_suspended) &&
 144                                 (temp & PORT_SUSPEND)) {
 145                         ehci->reset_done [i] = jiffies + msecs_to_jiffies (20);
 146                         temp |= PORT_RESUME;
 147                 }
 148                 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
 149         }
 150         i = HCS_N_PORTS (ehci->hcs_params);
 151         mdelay (20);
 152         while (i--) {
 153                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 154                 if (test_bit(i, &ehci->bus_suspended) &&
 155                                 (temp & PORT_SUSPEND)) {
 156                         temp &= ~(PORT_RWC_BITS | PORT_RESUME);
 157                         ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
 158                         ehci_vdbg (ehci, "resumed port %d\n", i + 1);
 159                 }
 160         }
 161         (void) ehci_readl(ehci, &ehci->regs->command);
 162
 163         /* maybe re-activate the schedule(s) */
 164         temp = 0;
 165         if (ehci->async->qh_next.qh)
 166                 temp |= CMD_ASE;
 167         if (ehci->periodic_sched)
 168                 temp |= CMD_PSE;
 169         if (temp) {
 170                 ehci->command |= temp;
 171                 ehci_writel(ehci, ehci->command, &ehci->regs->command);
 172         }
 173
 174         ehci->next_statechange = jiffies + msecs_to_jiffies(5);
 175         hcd->state = HC_STATE_RUNNING;
 176
 177         /* Now we can safely re-enable irqs */
 178         ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
 179
 180         spin_unlock_irq (&ehci->lock);
 181         return 0;
 182 }
 183
 184 #else
 185
 186 #define ehci_bus_suspend        NULL
 187 #define ehci_bus_resume         NULL
 188
 189 #endif  /* CONFIG_PM */
 190
 191 /*-------------------------------------------------------------------------*/
 192
 193 static int check_reset_complete (
 194         struct ehci_hcd *ehci,
 195         int             index,
 196         u32 __iomem     *status_reg,
 197         int             port_status
 198 ) {
 199         if (!(port_status & PORT_CONNECT)) {
 200                 ehci->reset_done [index] = 0;
 201                 return port_status;
 202         }
 203
 204         /* if reset finished and it's still not enabled -- handoff */
 205         if (!(port_status & PORT_PE)) {
 206
 207                 /* with integrated TT, there's nobody to hand it to! */
 208                 if (ehci_is_TDI(ehci)) {
 209                         ehci_dbg (ehci,
 210                                 "Failed to enable port %d on root hub TT\n",
 211                                 index+1);
 212                         return port_status;
 213                 }
 214
 215                 ehci_dbg (ehci, "port %d full speed --> companion\n",
 216                         index + 1);
 217
 218                 // what happens if HCS_N_CC(params) == 0 ?
 219                 port_status |= PORT_OWNER;
 220                 port_status &= ~PORT_RWC_BITS;
 221                 ehci_writel(ehci, port_status, status_reg);
 222
 223         } else
 224                 ehci_dbg (ehci, "port %d high speed\n", index + 1);
 225
 226         return port_status;
 227 }
 228
 229 /*-------------------------------------------------------------------------*/
 230
 231
 232 /* build "status change" packet (one or two bytes) from HC registers */
 233
 234 static int
 235 ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
 236 {
 237         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 238         u32             temp, status = 0;
 239         u32             mask;
 240         int             ports, i, retval = 1;
 241         unsigned long   flags;
 242
 243         /* if !USB_SUSPEND, root hub timers won't get shut down ... */
 244         if (!HC_IS_RUNNING(hcd->state))
 245                 return 0;
 246
 247         /* init status to no-changes */
 248         buf [0] = 0;
 249         ports = HCS_N_PORTS (ehci->hcs_params);
 250         if (ports > 7) {
 251                 buf [1] = 0;
 252                 retval++;
 253         }
 254
 255         /* Some boards (mostly VIA?) report bogus overcurrent indications,
 256          * causing massive log spam unless we completely ignore them.  It
 257          * may be relevant that VIA VT8235 controlers, where PORT_POWER is
 258          * always set, seem to clear PORT_OCC and PORT_CSC when writing to
 259          * PORT_POWER; that's surprising, but maybe within-spec.
 260          */
 261         if (!ignore_oc)
 262                 mask = PORT_CSC | PORT_PEC | PORT_OCC;
 263         else
 264                 mask = PORT_CSC | PORT_PEC;
 265         // PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
 266
 267         /* no hub change reports (bit 0) for now (power, ...) */
 268
 269         /* port N changes (bit N)? */
 270         spin_lock_irqsave (&ehci->lock, flags);
 271         for (i = 0; i < ports; i++) {
 272                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 273
 274                 /*
 275                  * Return status information even for ports with OWNER set.
 276                  * Otherwise khubd wouldn't see the disconnect event when a
 277                  * high-speed device is switched over to the companion
 278                  * controller by the user.
 279                  */
 280
 281                 if (!(temp & PORT_CONNECT))
 282                         ehci->reset_done [i] = 0;
 283                 if ((temp & mask) != 0
 284                                 || ((temp & PORT_RESUME) != 0
 285                                         && time_after (jiffies,
 286                                                 ehci->reset_done [i]))) {
 287                         if (i < 7)
 288                             buf [0] |= 1 << (i + 1);
 289                         else
 290                             buf [1] |= 1 << (i - 7);
 291                         status = STS_PCD;
 292                 }
 293         }
 294         /* FIXME autosuspend idle root hubs */
 295         spin_unlock_irqrestore (&ehci->lock, flags);
 296         return status ? retval : 0;
 297 }
 298
 299 /*-------------------------------------------------------------------------*/
 300
 301 static void
 302 ehci_hub_descriptor (
 303         struct ehci_hcd                 *ehci,
 304         struct usb_hub_descriptor       *desc
 305 ) {
 306         int             ports = HCS_N_PORTS (ehci->hcs_params);
 307         u16             temp;
 308
 309         desc->bDescriptorType = 0x29;
 310         desc->bPwrOn2PwrGood = 10;      /* ehci 1.0, 2.3.9 says 20ms max */
 311         desc->bHubContrCurrent = 0;
 312
 313         desc->bNbrPorts = ports;
 314         temp = 1 + (ports / 8);
 315         desc->bDescLength = 7 + 2 * temp;
 316
 317         /* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
 318         memset (&desc->bitmap [0], 0, temp);
 319         memset (&desc->bitmap [temp], 0xff, temp);
 320
 321         temp = 0x0008;                  /* per-port overcurrent reporting */
 322         if (HCS_PPC (ehci->hcs_params))
 323                 temp |= 0x0001;         /* per-port power control */
 324         else
 325                 temp |= 0x0002;         /* no power switching */
 326 #if 0
 327 // re-enable when we support USB_PORT_FEAT_INDICATOR below.
 328         if (HCS_INDICATOR (ehci->hcs_params))
 329                 temp |= 0x0080;         /* per-port indicators (LEDs) */
 330 #endif
 331         desc->wHubCharacteristics = (__force __u16)cpu_to_le16 (temp);
 332 }
 333
 334 /*-------------------------------------------------------------------------*/
 335
 336 #define PORT_WAKE_BITS  (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
 337
 338 static int ehci_hub_control (
 339         struct usb_hcd  *hcd,
 340         u16             typeReq,
 341         u16             wValue,
 342         u16             wIndex,
 343         char            *buf,
 344         u16             wLength
 345 ) {
 346         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 347         int             ports = HCS_N_PORTS (ehci->hcs_params);
 348         u32 __iomem     *status_reg = &ehci->regs->port_status[wIndex - 1];
 349         u32             temp, status;
 350         unsigned long   flags;
 351         int             retval = 0;
 352         unsigned        selector;
 353
 354         /*
 355          * FIXME:  support SetPortFeatures USB_PORT_FEAT_INDICATOR.
 356          * HCS_INDICATOR may say we can change LEDs to off/amber/green.
 357          * (track current state ourselves) ... blink for diagnostics,
 358          * power, "this is the one", etc.  EHCI spec supports this.
 359          */
 360
 361         spin_lock_irqsave (&ehci->lock, flags);
 362         switch (typeReq) {
 363         case ClearHubFeature:
 364                 switch (wValue) {
 365                 case C_HUB_LOCAL_POWER:
 366                 case C_HUB_OVER_CURRENT:
 367                         /* no hub-wide feature/status flags */
 368                         break;
 369                 default:
 370                         goto error;
 371                 }
 372                 break;
 373         case ClearPortFeature:
 374                 if (!wIndex || wIndex > ports)
 375                         goto error;
 376                 wIndex--;
 377                 temp = ehci_readl(ehci, status_reg);
 378
 379                 /*
 380                  * Even if OWNER is set, so the port is owned by the
 381                  * companion controller, khubd needs to be able to clear
 382                  * the port-change status bits (especially
 383                  * USB_PORT_FEAT_C_CONNECTION).
 384                  */
 385
 386                 switch (wValue) {
 387                 case USB_PORT_FEAT_ENABLE:
 388                         ehci_writel(ehci, temp & ~PORT_PE, status_reg);
 389                         break;
 390                 case USB_PORT_FEAT_C_ENABLE:
 391                         ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_PEC,
 392                                         status_reg);
 393                         break;
 394                 case USB_PORT_FEAT_SUSPEND:
 395                         if (temp & PORT_RESET)
 396                                 goto error;
 397                         if (ehci->no_selective_suspend)
 398                                 break;
 399                         if (temp & PORT_SUSPEND) {
 400                                 if ((temp & PORT_PE) == 0)
 401                                         goto error;
 402                                 /* resume signaling for 20 msec */
 403                                 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
 404                                 ehci_writel(ehci, temp | PORT_RESUME,
 405                                                 status_reg);
 406                                 ehci->reset_done [wIndex] = jiffies
 407                                                 + msecs_to_jiffies (20);
 408                         }
 409                         break;
 410                 case USB_PORT_FEAT_C_SUSPEND:
 411                         /* we auto-clear this feature */
 412                         break;
 413                 case USB_PORT_FEAT_POWER:
 414                         if (HCS_PPC (ehci->hcs_params))
 415                                 ehci_writel(ehci,
 416                                           temp & ~(PORT_RWC_BITS | PORT_POWER),
 417                                           status_reg);
 418                         break;
 419                 case USB_PORT_FEAT_C_CONNECTION:
 420                         ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_CSC,
 421                                         status_reg);
 422                         break;
 423                 case USB_PORT_FEAT_C_OVER_CURRENT:
 424                         ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_OCC,
 425                                         status_reg);
 426                         break;
 427                 case USB_PORT_FEAT_C_RESET:
 428                         /* GetPortStatus clears reset */
 429                         break;
 430                 default:
 431                         goto error;
 432                 }
 433                 ehci_readl(ehci, &ehci->regs->command); /* unblock posted write */
 434                 break;
 435         case GetHubDescriptor:
 436                 ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
 437                         buf);
 438                 break;
 439         case GetHubStatus:
 440                 /* no hub-wide feature/status flags */
 441                 memset (buf, 0, 4);
 442                 //cpu_to_le32s ((u32 *) buf);
 443                 break;
 444         case GetPortStatus:
 445                 if (!wIndex || wIndex > ports)
 446                         goto error;
 447                 wIndex--;
 448                 status = 0;
 449                 temp = ehci_readl(ehci, status_reg);
 450
 451                 // wPortChange bits
 452                 if (temp & PORT_CSC)
 453                         status |= 1 << USB_PORT_FEAT_C_CONNECTION;
 454                 if (temp & PORT_PEC)
 455                         status |= 1 << USB_PORT_FEAT_C_ENABLE;
 456                 if ((temp & PORT_OCC) && !ignore_oc)
 457                         status |= 1 << USB_PORT_FEAT_C_OVER_CURRENT;
 458
 459                 /* whoever resumes must GetPortStatus to complete it!! */
 460                 if ((temp & PORT_RESUME)
 461                                 && time_after (jiffies,
 462                                         ehci->reset_done [wIndex])) {
 463                         status |= 1 << USB_PORT_FEAT_C_SUSPEND;
 464                         ehci->reset_done [wIndex] = 0;
 465
 466                         /* stop resume signaling */
 467                         temp = ehci_readl(ehci, status_reg);
 468                         ehci_writel(ehci,
 469                                         temp & ~(PORT_RWC_BITS | PORT_RESUME),
 470                                         status_reg);
 471                         retval = handshake(ehci, status_reg,
 472                                            PORT_RESUME, 0, 2000 /* 2msec */);
 473                         if (retval != 0) {
 474                                 ehci_err (ehci, "port %d resume error %d\n",
 475                                         wIndex + 1, retval);
 476                                 goto error;
 477                         }
 478                         temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10));
 479                 }
 480
 481                 /* whoever resets must GetPortStatus to complete it!! */
 482                 if ((temp & PORT_RESET)
 483                                 && time_after (jiffies,
 484                                         ehci->reset_done [wIndex])) {
 485                         status |= 1 << USB_PORT_FEAT_C_RESET;
 486                         ehci->reset_done [wIndex] = 0;
 487
 488                         /* force reset to complete */
 489                         ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESET),
 490                                         status_reg);
 491                         /* REVISIT:  some hardware needs 550+ usec to clear
 492                          * this bit; seems too long to spin routinely...
 493                          */
 494                         retval = handshake(ehci, status_reg,
 495                                         PORT_RESET, 0, 750);
 496                         if (retval != 0) {
 497                                 ehci_err (ehci, "port %d reset error %d\n",
 498                                         wIndex + 1, retval);
 499                                 goto error;
 500                         }
 501
 502                         /* see what we found out */
 503                         temp = check_reset_complete (ehci, wIndex, status_reg,
 504                                         ehci_readl(ehci, status_reg));
 505                 }
 506
 507                 /*
 508                  * Even if OWNER is set, there's no harm letting khubd
 509                  * see the wPortStatus values (they should all be 0 except
 510                  * for PORT_POWER anyway).
 511                  */
 512
 513                 if (temp & PORT_CONNECT) {
 514                         status |= 1 << USB_PORT_FEAT_CONNECTION;
 515                         // status may be from integrated TT
 516                         status |= ehci_port_speed(ehci, temp);
 517                 }
 518                 if (temp & PORT_PE)
 519                         status |= 1 << USB_PORT_FEAT_ENABLE;
 520                 if (temp & (PORT_SUSPEND|PORT_RESUME))
 521                         status |= 1 << USB_PORT_FEAT_SUSPEND;
 522                 if (temp & PORT_OC)
 523                         status |= 1 << USB_PORT_FEAT_OVER_CURRENT;
 524                 if (temp & PORT_RESET)
 525                         status |= 1 << USB_PORT_FEAT_RESET;
 526                 if (temp & PORT_POWER)
 527                         status |= 1 << USB_PORT_FEAT_POWER;
 528
 529 #ifndef EHCI_VERBOSE_DEBUG
 530         if (status & ~0xffff)   /* only if wPortChange is interesting */
 531 #endif
 532                 dbg_port (ehci, "GetStatus", wIndex + 1, temp);
 533                 // we "know" this alignment is good, caller used kmalloc()...
 534                 *((__le32 *) buf) = cpu_to_le32 (status);
 535                 break;
 536         case SetHubFeature:
 537                 switch (wValue) {
 538                 case C_HUB_LOCAL_POWER:
 539                 case C_HUB_OVER_CURRENT:
 540                         /* no hub-wide feature/status flags */
 541                         break;
 542                 default:
 543                         goto error;
 544                 }
 545                 break;
 546         case SetPortFeature:
 547                 selector = wIndex >> 8;
 548                 wIndex &= 0xff;
 549                 if (!wIndex || wIndex > ports)
 550                         goto error;
 551                 wIndex--;
 552                 temp = ehci_readl(ehci, status_reg);
 553                 if (temp & PORT_OWNER)
 554                         break;
 555
 556                 temp &= ~PORT_RWC_BITS;
 557                 switch (wValue) {
 558                 case USB_PORT_FEAT_SUSPEND:
 559                         if (ehci->no_selective_suspend)
 560                                 break;
 561                         if ((temp & PORT_PE) == 0
 562                                         || (temp & PORT_RESET) != 0)
 563                                 goto error;
 564                         if (device_may_wakeup(&hcd->self.root_hub->dev))
 565                                 temp |= PORT_WAKE_BITS;
 566                         ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
 567                         break;
 568                 case USB_PORT_FEAT_POWER:
 569                         if (HCS_PPC (ehci->hcs_params))
 570                                 ehci_writel(ehci, temp | PORT_POWER,
 571                                                 status_reg);
 572                         break;
 573                 case USB_PORT_FEAT_RESET:
 574                         if (temp & PORT_RESUME)
 575                                 goto error;
 576                         /* line status bits may report this as low speed,
 577                          * which can be fine if this root hub has a
 578                          * transaction translator built in.
 579                          */
 580                         if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
 581                                         && !ehci_is_TDI(ehci)
 582                                         && PORT_USB11 (temp)) {
 583                                 ehci_dbg (ehci,
 584                                         "port %d low speed --> companion\n",
 585                                         wIndex + 1);
 586                                 temp |= PORT_OWNER;
 587                         } else {
 588                                 ehci_vdbg (ehci, "port %d reset\n", wIndex + 1);
 589                                 temp |= PORT_RESET;
 590                                 temp &= ~PORT_PE;
 591
 592                                 /*
 593                                  * caller must wait, then call GetPortStatus
 594                                  * usb 2.0 spec says 50 ms resets on root
 595                                  */
 596                                 ehci->reset_done [wIndex] = jiffies
 597                                                 + msecs_to_jiffies (50);
 598                         }
 599                         ehci_writel(ehci, temp, status_reg);
 600                         break;
 601
 602                 /* For downstream facing ports (these):  one hub port is put
 603                  * into test mode according to USB2 11.24.2.13, then the hub
 604                  * must be reset (which for root hub now means rmmod+modprobe,
 605                  * or else system reboot).  See EHCI 2.3.9 and 4.14 for info
 606                  * about the EHCI-specific stuff.
 607                  */
 608                 case USB_PORT_FEAT_TEST:
 609                         if (!selector || selector > 5)
 610                                 goto error;
 611                         ehci_quiesce(ehci);
 612                         ehci_halt(ehci);
 613                         temp |= selector << 16;
 614                         ehci_writel(ehci, temp, status_reg);
 615                         break;
 616
 617                 default:
 618                         goto error;
 619                 }
 620                 ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
 621                 break;
 622
 623         default:
 624 error:
 625                 /* "stall" on error */
 626                 retval = -EPIPE;
 627         }
 628         spin_unlock_irqrestore (&ehci->lock, flags);
 629         return retval;
 630 }