Pileus Git - ~andy/linux/blob - 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 #include <linux/usb/otg.h>
  31
  32 #define PORT_WAKE_BITS  (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
  33
  34 #ifdef  CONFIG_PM
  35
  36 static int ehci_hub_control(
  37         struct usb_hcd  *hcd,
  38         u16             typeReq,
  39         u16             wValue,
  40         u16             wIndex,
  41         char            *buf,
  42         u16             wLength
  43 );
  44
  45 static int persist_enabled_on_companion(struct usb_device *udev, void *unused)
  46 {
  47         return !udev->maxchild && udev->persist_enabled &&
  48                 udev->bus->root_hub->speed < USB_SPEED_HIGH;
  49 }
  50
  51 /* After a power loss, ports that were owned by the companion must be
  52  * reset so that the companion can still own them.
  53  */
  54 static void ehci_handover_companion_ports(struct ehci_hcd *ehci)
  55 {
  56         u32 __iomem     *reg;
  57         u32             status;
  58         int             port;
  59         __le32          buf;
  60         struct usb_hcd  *hcd = ehci_to_hcd(ehci);
  61
  62         if (!ehci->owned_ports)
  63                 return;
  64
  65         /*
  66          * USB 1.1 devices are mostly HIDs, which don't need to persist across
  67          * suspends. If we ensure that none of our companion's devices have
  68          * persist_enabled (by looking through all USB 1.1 buses in the system),
  69          * we can skip this and avoid slowing resume down. Devices without
  70          * persist will just get reenumerated shortly after resume anyway.
  71          */
  72         if (!usb_for_each_dev(NULL, persist_enabled_on_companion))
  73                 return;
  74
  75         /* Make sure the ports are powered */
  76         port = HCS_N_PORTS(ehci->hcs_params);
  77         while (port--) {
  78                 if (test_bit(port, &ehci->owned_ports)) {
  79                         reg = &ehci->regs->port_status[port];
  80                         status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
  81                         if (!(status & PORT_POWER)) {
  82                                 status |= PORT_POWER;
  83                                 ehci_writel(ehci, status, reg);
  84                         }
  85                 }
  86         }
  87
  88         /* Give the connections some time to appear */
  89         msleep(20);
  90
  91         spin_lock_irq(&ehci->lock);
  92         port = HCS_N_PORTS(ehci->hcs_params);
  93         while (port--) {
  94                 if (test_bit(port, &ehci->owned_ports)) {
  95                         reg = &ehci->regs->port_status[port];
  96                         status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
  97
  98                         /* Port already owned by companion? */
  99                         if (status & PORT_OWNER)
 100                                 clear_bit(port, &ehci->owned_ports);
 101                         else if (test_bit(port, &ehci->companion_ports))
 102                                 ehci_writel(ehci, status & ~PORT_PE, reg);
 103                         else {
 104                                 spin_unlock_irq(&ehci->lock);
 105                                 ehci_hub_control(hcd, SetPortFeature,
 106                                                 USB_PORT_FEAT_RESET, port + 1,
 107                                                 NULL, 0);
 108                                 spin_lock_irq(&ehci->lock);
 109                         }
 110                 }
 111         }
 112         spin_unlock_irq(&ehci->lock);
 113
 114         if (!ehci->owned_ports)
 115                 return;
 116         msleep(90);             /* Wait for resets to complete */
 117
 118         spin_lock_irq(&ehci->lock);
 119         port = HCS_N_PORTS(ehci->hcs_params);
 120         while (port--) {
 121                 if (test_bit(port, &ehci->owned_ports)) {
 122                         spin_unlock_irq(&ehci->lock);
 123                         ehci_hub_control(hcd, GetPortStatus,
 124                                         0, port + 1,
 125                                         (char *) &buf, sizeof(buf));
 126                         spin_lock_irq(&ehci->lock);
 127
 128                         /* The companion should now own the port,
 129                          * but if something went wrong the port must not
 130                          * remain enabled.
 131                          */
 132                         reg = &ehci->regs->port_status[port];
 133                         status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
 134                         if (status & PORT_OWNER)
 135                                 ehci_writel(ehci, status | PORT_CSC, reg);
 136                         else {
 137                                 ehci_dbg(ehci, "failed handover port %d: %x\n",
 138                                                 port + 1, status);
 139                                 ehci_writel(ehci, status & ~PORT_PE, reg);
 140                         }
 141                 }
 142         }
 143
 144         ehci->owned_ports = 0;
 145         spin_unlock_irq(&ehci->lock);
 146 }
 147
 148 static int ehci_port_change(struct ehci_hcd *ehci)
 149 {
 150         int i = HCS_N_PORTS(ehci->hcs_params);
 151
 152         /* First check if the controller indicates a change event */
 153
 154         if (ehci_readl(ehci, &ehci->regs->status) & STS_PCD)
 155                 return 1;
 156
 157         /*
 158          * Not all controllers appear to update this while going from D3 to D0,
 159          * so check the individual port status registers as well
 160          */
 161
 162         while (i--)
 163                 if (ehci_readl(ehci, &ehci->regs->port_status[i]) & PORT_CSC)
 164                         return 1;
 165
 166         return 0;
 167 }
 168
 169 static void ehci_adjust_port_wakeup_flags(struct ehci_hcd *ehci,
 170                 bool suspending, bool do_wakeup)
 171 {
 172         int             port;
 173         u32             temp;
 174
 175         /* If remote wakeup is enabled for the root hub but disabled
 176          * for the controller, we must adjust all the port wakeup flags
 177          * when the controller is suspended or resumed.  In all other
 178          * cases they don't need to be changed.
 179          */
 180         if (!ehci_to_hcd(ehci)->self.root_hub->do_remote_wakeup || do_wakeup)
 181                 return;
 182
 183         spin_lock_irq(&ehci->lock);
 184
 185         /* clear phy low-power mode before changing wakeup flags */
 186         if (ehci->has_tdi_phy_lpm) {
 187                 port = HCS_N_PORTS(ehci->hcs_params);
 188                 while (port--) {
 189                         u32 __iomem     *hostpc_reg = &ehci->regs->hostpc[port];
 190
 191                         temp = ehci_readl(ehci, hostpc_reg);
 192                         ehci_writel(ehci, temp & ~HOSTPC_PHCD, hostpc_reg);
 193                 }
 194                 spin_unlock_irq(&ehci->lock);
 195                 msleep(5);
 196                 spin_lock_irq(&ehci->lock);
 197         }
 198
 199         port = HCS_N_PORTS(ehci->hcs_params);
 200         while (port--) {
 201                 u32 __iomem     *reg = &ehci->regs->port_status[port];
 202                 u32             t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
 203                 u32             t2 = t1 & ~PORT_WAKE_BITS;
 204
 205                 /* If we are suspending the controller, clear the flags.
 206                  * If we are resuming the controller, set the wakeup flags.
 207                  */
 208                 if (!suspending) {
 209                         if (t1 & PORT_CONNECT)
 210                                 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
 211                         else
 212                                 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
 213                 }
 214                 ehci_writel(ehci, t2, reg);
 215         }
 216
 217         /* enter phy low-power mode again */
 218         if (ehci->has_tdi_phy_lpm) {
 219                 port = HCS_N_PORTS(ehci->hcs_params);
 220                 while (port--) {
 221                         u32 __iomem     *hostpc_reg = &ehci->regs->hostpc[port];
 222
 223                         temp = ehci_readl(ehci, hostpc_reg);
 224                         ehci_writel(ehci, temp | HOSTPC_PHCD, hostpc_reg);
 225                 }
 226         }
 227
 228         /* Does the root hub have a port wakeup pending? */
 229         if (!suspending && ehci_port_change(ehci))
 230                 usb_hcd_resume_root_hub(ehci_to_hcd(ehci));
 231
 232         spin_unlock_irq(&ehci->lock);
 233 }
 234
 235 static int ehci_bus_suspend (struct usb_hcd *hcd)
 236 {
 237         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 238         int                     port;
 239         int                     mask;
 240         int                     changed;
 241
 242         ehci_dbg(ehci, "suspend root hub\n");
 243
 244         if (time_before (jiffies, ehci->next_statechange))
 245                 msleep(5);
 246
 247         /* stop the schedules */
 248         ehci_quiesce(ehci);
 249
 250         spin_lock_irq (&ehci->lock);
 251         if (ehci->rh_state < EHCI_RH_RUNNING)
 252                 goto done;
 253
 254         /* Once the controller is stopped, port resumes that are already
 255          * in progress won't complete.  Hence if remote wakeup is enabled
 256          * for the root hub and any ports are in the middle of a resume or
 257          * remote wakeup, we must fail the suspend.
 258          */
 259         if (hcd->self.root_hub->do_remote_wakeup) {
 260                 if (ehci->resuming_ports) {
 261                         spin_unlock_irq(&ehci->lock);
 262                         ehci_dbg(ehci, "suspend failed because a port is resuming\n");
 263                         return -EBUSY;
 264                 }
 265         }
 266
 267         /* Unlike other USB host controller types, EHCI doesn't have
 268          * any notion of "global" or bus-wide suspend.  The driver has
 269          * to manually suspend all the active unsuspended ports, and
 270          * then manually resume them in the bus_resume() routine.
 271          */
 272         ehci->bus_suspended = 0;
 273         ehci->owned_ports = 0;
 274         changed = 0;
 275         port = HCS_N_PORTS(ehci->hcs_params);
 276         while (port--) {
 277                 u32 __iomem     *reg = &ehci->regs->port_status [port];
 278                 u32             t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
 279                 u32             t2 = t1 & ~PORT_WAKE_BITS;
 280
 281                 /* keep track of which ports we suspend */
 282                 if (t1 & PORT_OWNER)
 283                         set_bit(port, &ehci->owned_ports);
 284                 else if ((t1 & PORT_PE) && !(t1 & PORT_SUSPEND)) {
 285                         t2 |= PORT_SUSPEND;
 286                         set_bit(port, &ehci->bus_suspended);
 287                 }
 288
 289                 /* enable remote wakeup on all ports, if told to do so */
 290                 if (hcd->self.root_hub->do_remote_wakeup) {
 291                         /* only enable appropriate wake bits, otherwise the
 292                          * hardware can not go phy low power mode. If a race
 293                          * condition happens here(connection change during bits
 294                          * set), the port change detection will finally fix it.
 295                          */
 296                         if (t1 & PORT_CONNECT)
 297                                 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
 298                         else
 299                                 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
 300                 }
 301
 302                 if (t1 != t2) {
 303                         ehci_writel(ehci, t2, reg);
 304                         changed = 1;
 305                 }
 306         }
 307
 308         if (changed && ehci->has_tdi_phy_lpm) {
 309                 spin_unlock_irq(&ehci->lock);
 310                 msleep(5);      /* 5 ms for HCD to enter low-power mode */
 311                 spin_lock_irq(&ehci->lock);
 312
 313                 port = HCS_N_PORTS(ehci->hcs_params);
 314                 while (port--) {
 315                         u32 __iomem     *hostpc_reg = &ehci->regs->hostpc[port];
 316                         u32             t3;
 317
 318                         t3 = ehci_readl(ehci, hostpc_reg);
 319                         ehci_writel(ehci, t3 | HOSTPC_PHCD, hostpc_reg);
 320                         t3 = ehci_readl(ehci, hostpc_reg);
 321                         ehci_dbg(ehci, "Port %d phy low-power mode %s\n",
 322                                         port, (t3 & HOSTPC_PHCD) ?
 323                                         "succeeded" : "failed");
 324                 }
 325         }
 326         spin_unlock_irq(&ehci->lock);
 327
 328         /* Apparently some devices need a >= 1-uframe delay here */
 329         if (ehci->bus_suspended)
 330                 udelay(150);
 331
 332         /* turn off now-idle HC */
 333         ehci_halt (ehci);
 334
 335         spin_lock_irq(&ehci->lock);
 336         if (ehci->enabled_hrtimer_events & BIT(EHCI_HRTIMER_POLL_DEAD))
 337                 ehci_handle_controller_death(ehci);
 338         if (ehci->rh_state != EHCI_RH_RUNNING)
 339                 goto done;
 340         ehci->rh_state = EHCI_RH_SUSPENDED;
 341
 342         end_unlink_async(ehci);
 343         unlink_empty_async_suspended(ehci);
 344         ehci_handle_start_intr_unlinks(ehci);
 345         ehci_handle_intr_unlinks(ehci);
 346         end_free_itds(ehci);
 347
 348         /* allow remote wakeup */
 349         mask = INTR_MASK;
 350         if (!hcd->self.root_hub->do_remote_wakeup)
 351                 mask &= ~STS_PCD;
 352         ehci_writel(ehci, mask, &ehci->regs->intr_enable);
 353         ehci_readl(ehci, &ehci->regs->intr_enable);
 354
 355  done:
 356         ehci->next_statechange = jiffies + msecs_to_jiffies(10);
 357         ehci->enabled_hrtimer_events = 0;
 358         ehci->next_hrtimer_event = EHCI_HRTIMER_NO_EVENT;
 359         spin_unlock_irq (&ehci->lock);
 360
 361         hrtimer_cancel(&ehci->hrtimer);
 362         return 0;
 363 }
 364
 365
 366 /* caller has locked the root hub, and should reset/reinit on error */
 367 static int ehci_bus_resume (struct usb_hcd *hcd)
 368 {
 369         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 370         u32                     temp;
 371         u32                     power_okay;
 372         int                     i;
 373         unsigned long           resume_needed = 0;
 374
 375         if (time_before (jiffies, ehci->next_statechange))
 376                 msleep(5);
 377         spin_lock_irq (&ehci->lock);
 378         if (!HCD_HW_ACCESSIBLE(hcd) || ehci->shutdown)
 379                 goto shutdown;
 380
 381         if (unlikely(ehci->debug)) {
 382                 if (!dbgp_reset_prep(hcd))
 383                         ehci->debug = NULL;
 384                 else
 385                         dbgp_external_startup(hcd);
 386         }
 387
 388         /* Ideally and we've got a real resume here, and no port's power
 389          * was lost.  (For PCI, that means Vaux was maintained.)  But we
 390          * could instead be restoring a swsusp snapshot -- so that BIOS was
 391          * the last user of the controller, not reset/pm hardware keeping
 392          * state we gave to it.
 393          */
 394         power_okay = ehci_readl(ehci, &ehci->regs->intr_enable);
 395         ehci_dbg(ehci, "resume root hub%s\n",
 396                         power_okay ? "" : " after power loss");
 397
 398         /* at least some APM implementations will try to deliver
 399          * IRQs right away, so delay them until we're ready.
 400          */
 401         ehci_writel(ehci, 0, &ehci->regs->intr_enable);
 402
 403         /* re-init operational registers */
 404         ehci_writel(ehci, 0, &ehci->regs->segment);
 405         ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
 406         ehci_writel(ehci, (u32) ehci->async->qh_dma, &ehci->regs->async_next);
 407
 408         /* restore CMD_RUN, framelist size, and irq threshold */
 409         ehci->command |= CMD_RUN;
 410         ehci_writel(ehci, ehci->command, &ehci->regs->command);
 411         ehci->rh_state = EHCI_RH_RUNNING;
 412
 413         /*
 414          * According to Bugzilla #8190, the port status for some controllers
 415          * will be wrong without a delay. At their wrong status, the port
 416          * is enabled, but not suspended neither resumed.
 417          */
 418         i = HCS_N_PORTS(ehci->hcs_params);
 419         while (i--) {
 420                 temp = ehci_readl(ehci, &ehci->regs->port_status[i]);
 421                 if ((temp & PORT_PE) &&
 422                                 !(temp & (PORT_SUSPEND | PORT_RESUME))) {
 423                         ehci_dbg(ehci, "Port status(0x%x) is wrong\n", temp);
 424                         spin_unlock_irq(&ehci->lock);
 425                         msleep(8);
 426                         spin_lock_irq(&ehci->lock);
 427                         break;
 428                 }
 429         }
 430
 431         if (ehci->shutdown)
 432                 goto shutdown;
 433
 434         /* clear phy low-power mode before resume */
 435         if (ehci->bus_suspended && ehci->has_tdi_phy_lpm) {
 436                 i = HCS_N_PORTS(ehci->hcs_params);
 437                 while (i--) {
 438                         if (test_bit(i, &ehci->bus_suspended)) {
 439                                 u32 __iomem     *hostpc_reg =
 440                                                         &ehci->regs->hostpc[i];
 441
 442                                 temp = ehci_readl(ehci, hostpc_reg);
 443                                 ehci_writel(ehci, temp & ~HOSTPC_PHCD,
 444                                                 hostpc_reg);
 445                         }
 446                 }
 447                 spin_unlock_irq(&ehci->lock);
 448                 msleep(5);
 449                 spin_lock_irq(&ehci->lock);
 450                 if (ehci->shutdown)
 451                         goto shutdown;
 452         }
 453
 454         /* manually resume the ports we suspended during bus_suspend() */
 455         i = HCS_N_PORTS (ehci->hcs_params);
 456         while (i--) {
 457                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 458                 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
 459                 if (test_bit(i, &ehci->bus_suspended) &&
 460                                 (temp & PORT_SUSPEND)) {
 461                         temp |= PORT_RESUME;
 462                         set_bit(i, &resume_needed);
 463                 }
 464                 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
 465         }
 466
 467         /* msleep for 20ms only if code is trying to resume port */
 468         if (resume_needed) {
 469                 spin_unlock_irq(&ehci->lock);
 470                 msleep(20);
 471                 spin_lock_irq(&ehci->lock);
 472                 if (ehci->shutdown)
 473                         goto shutdown;
 474         }
 475
 476         i = HCS_N_PORTS (ehci->hcs_params);
 477         while (i--) {
 478                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 479                 if (test_bit(i, &resume_needed)) {
 480                         temp &= ~(PORT_RWC_BITS | PORT_SUSPEND | PORT_RESUME);
 481                         ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
 482                 }
 483         }
 484
 485         ehci->next_statechange = jiffies + msecs_to_jiffies(5);
 486         spin_unlock_irq(&ehci->lock);
 487
 488         ehci_handover_companion_ports(ehci);
 489
 490         /* Now we can safely re-enable irqs */
 491         spin_lock_irq(&ehci->lock);
 492         if (ehci->shutdown)
 493                 goto shutdown;
 494         ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
 495         (void) ehci_readl(ehci, &ehci->regs->intr_enable);
 496         spin_unlock_irq(&ehci->lock);
 497
 498         return 0;
 499
 500  shutdown:
 501         spin_unlock_irq(&ehci->lock);
 502         return -ESHUTDOWN;
 503 }
 504
 505 #else
 506
 507 #define ehci_bus_suspend        NULL
 508 #define ehci_bus_resume         NULL
 509
 510 #endif  /* CONFIG_PM */
 511
 512 /*-------------------------------------------------------------------------*/
 513
 514 /*
 515  * Sets the owner of a port
 516  */
 517 static void set_owner(struct ehci_hcd *ehci, int portnum, int new_owner)
 518 {
 519         u32 __iomem             *status_reg;
 520         u32                     port_status;
 521         int                     try;
 522
 523         status_reg = &ehci->regs->port_status[portnum];
 524
 525         /*
 526          * The controller won't set the OWNER bit if the port is
 527          * enabled, so this loop will sometimes require at least two
 528          * iterations: one to disable the port and one to set OWNER.
 529          */
 530         for (try = 4; try > 0; --try) {
 531                 spin_lock_irq(&ehci->lock);
 532                 port_status = ehci_readl(ehci, status_reg);
 533                 if ((port_status & PORT_OWNER) == new_owner
 534                                 || (port_status & (PORT_OWNER | PORT_CONNECT))
 535                                         == 0)
 536                         try = 0;
 537                 else {
 538                         port_status ^= PORT_OWNER;
 539                         port_status &= ~(PORT_PE | PORT_RWC_BITS);
 540                         ehci_writel(ehci, port_status, status_reg);
 541                 }
 542                 spin_unlock_irq(&ehci->lock);
 543                 if (try > 1)
 544                         msleep(5);
 545         }
 546 }
 547
 548 /*-------------------------------------------------------------------------*/
 549
 550 static int check_reset_complete (
 551         struct ehci_hcd *ehci,
 552         int             index,
 553         u32 __iomem     *status_reg,
 554         int             port_status
 555 ) {
 556         if (!(port_status & PORT_CONNECT))
 557                 return port_status;
 558
 559         /* if reset finished and it's still not enabled -- handoff */
 560         if (!(port_status & PORT_PE)) {
 561
 562                 /* with integrated TT, there's nobody to hand it to! */
 563                 if (ehci_is_TDI(ehci)) {
 564                         ehci_dbg (ehci,
 565                                 "Failed to enable port %d on root hub TT\n",
 566                                 index+1);
 567                         return port_status;
 568                 }
 569
 570                 ehci_dbg (ehci, "port %d full speed --> companion\n",
 571                         index + 1);
 572
 573                 // what happens if HCS_N_CC(params) == 0 ?
 574                 port_status |= PORT_OWNER;
 575                 port_status &= ~PORT_RWC_BITS;
 576                 ehci_writel(ehci, port_status, status_reg);
 577
 578                 /* ensure 440EPX ohci controller state is operational */
 579                 if (ehci->has_amcc_usb23)
 580                         set_ohci_hcfs(ehci, 1);
 581         } else {
 582                 ehci_dbg(ehci, "port %d reset complete, port enabled\n",
 583                         index + 1);
 584                 /* ensure 440EPx ohci controller state is suspended */
 585                 if (ehci->has_amcc_usb23)
 586                         set_ohci_hcfs(ehci, 0);
 587         }
 588
 589         return port_status;
 590 }
 591
 592 /*-------------------------------------------------------------------------*/
 593
 594
 595 /* build "status change" packet (one or two bytes) from HC registers */
 596
 597 static int
 598 ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
 599 {
 600         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 601         u32             temp, status;
 602         u32             mask;
 603         int             ports, i, retval = 1;
 604         unsigned long   flags;
 605         u32             ppcd = ~0;
 606
 607         /* init status to no-changes */
 608         buf [0] = 0;
 609         ports = HCS_N_PORTS (ehci->hcs_params);
 610         if (ports > 7) {
 611                 buf [1] = 0;
 612                 retval++;
 613         }
 614
 615         /* Inform the core about resumes-in-progress by returning
 616          * a non-zero value even if there are no status changes.
 617          */
 618         status = ehci->resuming_ports;
 619
 620         /* Some boards (mostly VIA?) report bogus overcurrent indications,
 621          * causing massive log spam unless we completely ignore them.  It
 622          * may be relevant that VIA VT8235 controllers, where PORT_POWER is
 623          * always set, seem to clear PORT_OCC and PORT_CSC when writing to
 624          * PORT_POWER; that's surprising, but maybe within-spec.
 625          */
 626         if (!ignore_oc)
 627                 mask = PORT_CSC | PORT_PEC | PORT_OCC;
 628         else
 629                 mask = PORT_CSC | PORT_PEC;
 630         // PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
 631
 632         /* no hub change reports (bit 0) for now (power, ...) */
 633
 634         /* port N changes (bit N)? */
 635         spin_lock_irqsave (&ehci->lock, flags);
 636
 637         /* get per-port change detect bits */
 638         if (ehci->has_ppcd)
 639                 ppcd = ehci_readl(ehci, &ehci->regs->status) >> 16;
 640
 641         for (i = 0; i < ports; i++) {
 642                 /* leverage per-port change bits feature */
 643                 if (ppcd & (1 << i))
 644                         temp = ehci_readl(ehci, &ehci->regs->port_status[i]);
 645                 else
 646                         temp = 0;
 647
 648                 /*
 649                  * Return status information even for ports with OWNER set.
 650                  * Otherwise khubd wouldn't see the disconnect event when a
 651                  * high-speed device is switched over to the companion
 652                  * controller by the user.
 653                  */
 654
 655                 if ((temp & mask) != 0 || test_bit(i, &ehci->port_c_suspend)
 656                                 || (ehci->reset_done[i] && time_after_eq(
 657                                         jiffies, ehci->reset_done[i]))) {
 658                         if (i < 7)
 659                             buf [0] |= 1 << (i + 1);
 660                         else
 661                             buf [1] |= 1 << (i - 7);
 662                         status = STS_PCD;
 663                 }
 664         }
 665
 666         /* If a resume is in progress, make sure it can finish */
 667         if (ehci->resuming_ports)
 668                 mod_timer(&hcd->rh_timer, jiffies + msecs_to_jiffies(25));
 669
 670         spin_unlock_irqrestore (&ehci->lock, flags);
 671         return status ? retval : 0;
 672 }
 673
 674 /*-------------------------------------------------------------------------*/
 675
 676 static void
 677 ehci_hub_descriptor (
 678         struct ehci_hcd                 *ehci,
 679         struct usb_hub_descriptor       *desc
 680 ) {
 681         int             ports = HCS_N_PORTS (ehci->hcs_params);
 682         u16             temp;
 683
 684         desc->bDescriptorType = 0x29;
 685         desc->bPwrOn2PwrGood = 10;      /* ehci 1.0, 2.3.9 says 20ms max */
 686         desc->bHubContrCurrent = 0;
 687
 688         desc->bNbrPorts = ports;
 689         temp = 1 + (ports / 8);
 690         desc->bDescLength = 7 + 2 * temp;
 691
 692         /* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
 693         memset(&desc->u.hs.DeviceRemovable[0], 0, temp);
 694         memset(&desc->u.hs.DeviceRemovable[temp], 0xff, temp);
 695
 696         temp = 0x0008;                  /* per-port overcurrent reporting */
 697         if (HCS_PPC (ehci->hcs_params))
 698                 temp |= 0x0001;         /* per-port power control */
 699         else
 700                 temp |= 0x0002;         /* no power switching */
 701 #if 0
 702 // re-enable when we support USB_PORT_FEAT_INDICATOR below.
 703         if (HCS_INDICATOR (ehci->hcs_params))
 704                 temp |= 0x0080;         /* per-port indicators (LEDs) */
 705 #endif
 706         desc->wHubCharacteristics = cpu_to_le16(temp);
 707 }
 708
 709 /*-------------------------------------------------------------------------*/
 710 #ifdef CONFIG_USB_HCD_TEST_MODE
 711
 712 #define EHSET_TEST_SINGLE_STEP_SET_FEATURE 0x06
 713
 714 static void usb_ehset_completion(struct urb *urb)
 715 {
 716         struct completion  *done = urb->context;
 717
 718         complete(done);
 719 }
 720 static int submit_single_step_set_feature(
 721         struct usb_hcd  *hcd,
 722         struct urb      *urb,
 723         int             is_setup
 724 );
 725
 726 /*
 727  * Allocate and initialize a control URB. This request will be used by the
 728  * EHSET SINGLE_STEP_SET_FEATURE test in which the DATA and STATUS stages
 729  * of the GetDescriptor request are sent 15 seconds after the SETUP stage.
 730  * Return NULL if failed.
 731  */
 732 static struct urb *request_single_step_set_feature_urb(
 733         struct usb_device       *udev,
 734         void                    *dr,
 735         void                    *buf,
 736         struct completion       *done
 737 ) {
 738         struct urb *urb;
 739         struct usb_hcd *hcd = bus_to_hcd(udev->bus);
 740         struct usb_host_endpoint *ep;
 741
 742         urb = usb_alloc_urb(0, GFP_KERNEL);
 743         if (!urb)
 744                 return NULL;
 745
 746         urb->pipe = usb_rcvctrlpipe(udev, 0);
 747         ep = (usb_pipein(urb->pipe) ? udev->ep_in : udev->ep_out)
 748                                 [usb_pipeendpoint(urb->pipe)];
 749         if (!ep) {
 750                 usb_free_urb(urb);
 751                 return NULL;
 752         }
 753
 754         urb->ep = ep;
 755         urb->dev = udev;
 756         urb->setup_packet = (void *)dr;
 757         urb->transfer_buffer = buf;
 758         urb->transfer_buffer_length = USB_DT_DEVICE_SIZE;
 759         urb->complete = usb_ehset_completion;
 760         urb->status = -EINPROGRESS;
 761         urb->actual_length = 0;
 762         urb->transfer_flags = URB_DIR_IN;
 763         usb_get_urb(urb);
 764         atomic_inc(&urb->use_count);
 765         atomic_inc(&urb->dev->urbnum);
 766         urb->setup_dma = dma_map_single(
 767                         hcd->self.controller,
 768                         urb->setup_packet,
 769                         sizeof(struct usb_ctrlrequest),
 770                         DMA_TO_DEVICE);
 771         urb->transfer_dma = dma_map_single(
 772                         hcd->self.controller,
 773                         urb->transfer_buffer,
 774                         urb->transfer_buffer_length,
 775                         DMA_FROM_DEVICE);
 776         urb->context = done;
 777         return urb;
 778 }
 779
 780 static int ehset_single_step_set_feature(struct usb_hcd *hcd, int port)
 781 {
 782         int retval = -ENOMEM;
 783         struct usb_ctrlrequest *dr;
 784         struct urb *urb;
 785         struct usb_device *udev;
 786         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 787         struct usb_device_descriptor *buf;
 788         DECLARE_COMPLETION_ONSTACK(done);
 789
 790         /* Obtain udev of the rhub's child port */
 791         udev = usb_hub_find_child(hcd->self.root_hub, port);
 792         if (!udev) {
 793                 ehci_err(ehci, "No device attached to the RootHub\n");
 794                 return -ENODEV;
 795         }
 796         buf = kmalloc(USB_DT_DEVICE_SIZE, GFP_KERNEL);
 797         if (!buf)
 798                 return -ENOMEM;
 799
 800         dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
 801         if (!dr) {
 802                 kfree(buf);
 803                 return -ENOMEM;
 804         }
 805
 806         /* Fill Setup packet for GetDescriptor */
 807         dr->bRequestType = USB_DIR_IN;
 808         dr->bRequest = USB_REQ_GET_DESCRIPTOR;
 809         dr->wValue = cpu_to_le16(USB_DT_DEVICE << 8);
 810         dr->wIndex = 0;
 811         dr->wLength = cpu_to_le16(USB_DT_DEVICE_SIZE);
 812         urb = request_single_step_set_feature_urb(udev, dr, buf, &done);
 813         if (!urb)
 814                 goto cleanup;
 815
 816         /* Submit just the SETUP stage */
 817         retval = submit_single_step_set_feature(hcd, urb, 1);
 818         if (retval)
 819                 goto out1;
 820         if (!wait_for_completion_timeout(&done, msecs_to_jiffies(2000))) {
 821                 usb_kill_urb(urb);
 822                 retval = -ETIMEDOUT;
 823                 ehci_err(ehci, "%s SETUP stage timed out on ep0\n", __func__);
 824                 goto out1;
 825         }
 826         msleep(15 * 1000);
 827
 828         /* Complete remaining DATA and STATUS stages using the same URB */
 829         urb->status = -EINPROGRESS;
 830         usb_get_urb(urb);
 831         atomic_inc(&urb->use_count);
 832         atomic_inc(&urb->dev->urbnum);
 833         retval = submit_single_step_set_feature(hcd, urb, 0);
 834         if (!retval && !wait_for_completion_timeout(&done,
 835                                                 msecs_to_jiffies(2000))) {
 836                 usb_kill_urb(urb);
 837                 retval = -ETIMEDOUT;
 838                 ehci_err(ehci, "%s IN stage timed out on ep0\n", __func__);
 839         }
 840 out1:
 841         usb_free_urb(urb);
 842 cleanup:
 843         kfree(dr);
 844         kfree(buf);
 845         return retval;
 846 }
 847 #endif /* CONFIG_USB_HCD_TEST_MODE */
 848 /*-------------------------------------------------------------------------*/
 849
 850 static int ehci_hub_control (
 851         struct usb_hcd  *hcd,
 852         u16             typeReq,
 853         u16             wValue,
 854         u16             wIndex,
 855         char            *buf,
 856         u16             wLength
 857 ) {
 858         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 859         int             ports = HCS_N_PORTS (ehci->hcs_params);
 860         u32 __iomem     *status_reg = &ehci->regs->port_status[
 861                                 (wIndex & 0xff) - 1];
 862         u32 __iomem     *hostpc_reg = &ehci->regs->hostpc[(wIndex & 0xff) - 1];
 863         u32             temp, temp1, status;
 864         unsigned long   flags;
 865         int             retval = 0;
 866         unsigned        selector;
 867
 868         /*
 869          * FIXME:  support SetPortFeatures USB_PORT_FEAT_INDICATOR.
 870          * HCS_INDICATOR may say we can change LEDs to off/amber/green.
 871          * (track current state ourselves) ... blink for diagnostics,
 872          * power, "this is the one", etc.  EHCI spec supports this.
 873          */
 874
 875         spin_lock_irqsave (&ehci->lock, flags);
 876         switch (typeReq) {
 877         case ClearHubFeature:
 878                 switch (wValue) {
 879                 case C_HUB_LOCAL_POWER:
 880                 case C_HUB_OVER_CURRENT:
 881                         /* no hub-wide feature/status flags */
 882                         break;
 883                 default:
 884                         goto error;
 885                 }
 886                 break;
 887         case ClearPortFeature:
 888                 if (!wIndex || wIndex > ports)
 889                         goto error;
 890                 wIndex--;
 891                 temp = ehci_readl(ehci, status_reg);
 892                 temp &= ~PORT_RWC_BITS;
 893
 894                 /*
 895                  * Even if OWNER is set, so the port is owned by the
 896                  * companion controller, khubd needs to be able to clear
 897                  * the port-change status bits (especially
 898                  * USB_PORT_STAT_C_CONNECTION).
 899                  */
 900
 901                 switch (wValue) {
 902                 case USB_PORT_FEAT_ENABLE:
 903                         ehci_writel(ehci, temp & ~PORT_PE, status_reg);
 904                         break;
 905                 case USB_PORT_FEAT_C_ENABLE:
 906                         ehci_writel(ehci, temp | PORT_PEC, status_reg);
 907                         break;
 908                 case USB_PORT_FEAT_SUSPEND:
 909                         if (temp & PORT_RESET)
 910                                 goto error;
 911                         if (ehci->no_selective_suspend)
 912                                 break;
 913 #ifdef CONFIG_USB_OTG
 914                         if ((hcd->self.otg_port == (wIndex + 1))
 915                             && hcd->self.b_hnp_enable) {
 916                                 otg_start_hnp(hcd->phy->otg);
 917                                 break;
 918                         }
 919 #endif
 920                         if (!(temp & PORT_SUSPEND))
 921                                 break;
 922                         if ((temp & PORT_PE) == 0)
 923                                 goto error;
 924
 925                         /* clear phy low-power mode before resume */
 926                         if (ehci->has_tdi_phy_lpm) {
 927                                 temp1 = ehci_readl(ehci, hostpc_reg);
 928                                 ehci_writel(ehci, temp1 & ~HOSTPC_PHCD,
 929                                                 hostpc_reg);
 930                                 spin_unlock_irqrestore(&ehci->lock, flags);
 931                                 msleep(5);/* wait to leave low-power mode */
 932                                 spin_lock_irqsave(&ehci->lock, flags);
 933                         }
 934                         /* resume signaling for 20 msec */
 935                         temp &= ~PORT_WAKE_BITS;
 936                         ehci_writel(ehci, temp | PORT_RESUME, status_reg);
 937                         ehci->reset_done[wIndex] = jiffies
 938                                         + msecs_to_jiffies(20);
 939                         set_bit(wIndex, &ehci->resuming_ports);
 940                         usb_hcd_start_port_resume(&hcd->self, wIndex);
 941                         break;
 942                 case USB_PORT_FEAT_C_SUSPEND:
 943                         clear_bit(wIndex, &ehci->port_c_suspend);
 944                         break;
 945                 case USB_PORT_FEAT_POWER:
 946                         if (HCS_PPC (ehci->hcs_params))
 947                                 ehci_writel(ehci, temp & ~PORT_POWER,
 948                                                 status_reg);
 949                         break;
 950                 case USB_PORT_FEAT_C_CONNECTION:
 951                         ehci_writel(ehci, temp | PORT_CSC, status_reg);
 952                         break;
 953                 case USB_PORT_FEAT_C_OVER_CURRENT:
 954                         ehci_writel(ehci, temp | PORT_OCC, status_reg);
 955                         break;
 956                 case USB_PORT_FEAT_C_RESET:
 957                         /* GetPortStatus clears reset */
 958                         break;
 959                 default:
 960                         goto error;
 961                 }
 962                 ehci_readl(ehci, &ehci->regs->command); /* unblock posted write */
 963                 break;
 964         case GetHubDescriptor:
 965                 ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
 966                         buf);
 967                 break;
 968         case GetHubStatus:
 969                 /* no hub-wide feature/status flags */
 970                 memset (buf, 0, 4);
 971                 //cpu_to_le32s ((u32 *) buf);
 972                 break;
 973         case GetPortStatus:
 974                 if (!wIndex || wIndex > ports)
 975                         goto error;
 976                 wIndex--;
 977                 status = 0;
 978                 temp = ehci_readl(ehci, status_reg);
 979
 980                 // wPortChange bits
 981                 if (temp & PORT_CSC)
 982                         status |= USB_PORT_STAT_C_CONNECTION << 16;
 983                 if (temp & PORT_PEC)
 984                         status |= USB_PORT_STAT_C_ENABLE << 16;
 985
 986                 if ((temp & PORT_OCC) && !ignore_oc){
 987                         status |= USB_PORT_STAT_C_OVERCURRENT << 16;
 988
 989                         /*
 990                          * Hubs should disable port power on over-current.
 991                          * However, not all EHCI implementations do this
 992                          * automatically, even if they _do_ support per-port
 993                          * power switching; they're allowed to just limit the
 994                          * current.  khubd will turn the power back on.
 995                          */
 996                         if (((temp & PORT_OC) || (ehci->need_oc_pp_cycle))
 997                                         && HCS_PPC(ehci->hcs_params)) {
 998                                 ehci_writel(ehci,
 999                                         temp & ~(PORT_RWC_BITS | PORT_POWER),
1000                                         status_reg);
1001                                 temp = ehci_readl(ehci, status_reg);
1002                         }
1003                 }
1004
1005                 /* no reset or resume pending */
1006                 if (!ehci->reset_done[wIndex]) {
1007
1008                         /* Remote Wakeup received? */
1009                         if (temp & PORT_RESUME) {
1010                                 /* resume signaling for 20 msec */
1011                                 ehci->reset_done[wIndex] = jiffies
1012                                                 + msecs_to_jiffies(20);
1013                                 usb_hcd_start_port_resume(&hcd->self, wIndex);
1014                                 set_bit(wIndex, &ehci->resuming_ports);
1015                                 /* check the port again */
1016                                 mod_timer(&ehci_to_hcd(ehci)->rh_timer,
1017                                                 ehci->reset_done[wIndex]);
1018                         }
1019
1020                 /* reset or resume not yet complete */
1021                 } else if (!time_after_eq(jiffies, ehci->reset_done[wIndex])) {
1022                         ;       /* wait until it is complete */
1023
1024                 /* resume completed */
1025                 } else if (test_bit(wIndex, &ehci->resuming_ports)) {
1026                         clear_bit(wIndex, &ehci->suspended_ports);
1027                         set_bit(wIndex, &ehci->port_c_suspend);
1028                         ehci->reset_done[wIndex] = 0;
1029                         usb_hcd_end_port_resume(&hcd->self, wIndex);
1030
1031                         /* stop resume signaling */
1032                         temp &= ~(PORT_RWC_BITS | PORT_SUSPEND | PORT_RESUME);
1033                         ehci_writel(ehci, temp, status_reg);
1034                         clear_bit(wIndex, &ehci->resuming_ports);
1035                         retval = ehci_handshake(ehci, status_reg,
1036                                         PORT_RESUME, 0, 2000 /* 2msec */);
1037                         if (retval != 0) {
1038                                 ehci_err(ehci, "port %d resume error %d\n",
1039                                                 wIndex + 1, retval);
1040                                 goto error;
1041                         }
1042                         temp = ehci_readl(ehci, status_reg);
1043
1044                 /* whoever resets must GetPortStatus to complete it!! */
1045                 } else {
1046                         status |= USB_PORT_STAT_C_RESET << 16;
1047                         ehci->reset_done [wIndex] = 0;
1048
1049                         /* force reset to complete */
1050                         ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESET),
1051                                         status_reg);
1052                         /* REVISIT:  some hardware needs 550+ usec to clear
1053                          * this bit; seems too long to spin routinely...
1054                          */
1055                         retval = ehci_handshake(ehci, status_reg,
1056                                         PORT_RESET, 0, 1000);
1057                         if (retval != 0) {
1058                                 ehci_err (ehci, "port %d reset error %d\n",
1059                                         wIndex + 1, retval);
1060                                 goto error;
1061                         }
1062
1063                         /* see what we found out */
1064                         temp = check_reset_complete (ehci, wIndex, status_reg,
1065                                         ehci_readl(ehci, status_reg));
1066                 }
1067
1068                 /* transfer dedicated ports to the companion hc */
1069                 if ((temp & PORT_CONNECT) &&
1070                                 test_bit(wIndex, &ehci->companion_ports)) {
1071                         temp &= ~PORT_RWC_BITS;
1072                         temp |= PORT_OWNER;
1073                         ehci_writel(ehci, temp, status_reg);
1074                         ehci_dbg(ehci, "port %d --> companion\n", wIndex + 1);
1075                         temp = ehci_readl(ehci, status_reg);
1076                 }
1077
1078                 /*
1079                  * Even if OWNER is set, there's no harm letting khubd
1080                  * see the wPortStatus values (they should all be 0 except
1081                  * for PORT_POWER anyway).
1082                  */
1083
1084                 if (temp & PORT_CONNECT) {
1085                         status |= USB_PORT_STAT_CONNECTION;
1086                         // status may be from integrated TT
1087                         if (ehci->has_hostpc) {
1088                                 temp1 = ehci_readl(ehci, hostpc_reg);
1089                                 status |= ehci_port_speed(ehci, temp1);
1090                         } else
1091                                 status |= ehci_port_speed(ehci, temp);
1092                 }
1093                 if (temp & PORT_PE)
1094                         status |= USB_PORT_STAT_ENABLE;
1095
1096                 /* maybe the port was unsuspended without our knowledge */
1097                 if (temp & (PORT_SUSPEND|PORT_RESUME)) {
1098                         status |= USB_PORT_STAT_SUSPEND;
1099                 } else if (test_bit(wIndex, &ehci->suspended_ports)) {
1100                         clear_bit(wIndex, &ehci->suspended_ports);
1101                         clear_bit(wIndex, &ehci->resuming_ports);
1102                         ehci->reset_done[wIndex] = 0;
1103                         if (temp & PORT_PE)
1104                                 set_bit(wIndex, &ehci->port_c_suspend);
1105                         usb_hcd_end_port_resume(&hcd->self, wIndex);
1106                 }
1107
1108                 if (temp & PORT_OC)
1109                         status |= USB_PORT_STAT_OVERCURRENT;
1110                 if (temp & PORT_RESET)
1111                         status |= USB_PORT_STAT_RESET;
1112                 if (temp & PORT_POWER)
1113                         status |= USB_PORT_STAT_POWER;
1114                 if (test_bit(wIndex, &ehci->port_c_suspend))
1115                         status |= USB_PORT_STAT_C_SUSPEND << 16;
1116
1117                 if (status & ~0xffff)   /* only if wPortChange is interesting */
1118                         dbg_port(ehci, "GetStatus", wIndex + 1, temp);
1119                 put_unaligned_le32(status, buf);
1120                 break;
1121         case SetHubFeature:
1122                 switch (wValue) {
1123                 case C_HUB_LOCAL_POWER:
1124                 case C_HUB_OVER_CURRENT:
1125                         /* no hub-wide feature/status flags */
1126                         break;
1127                 default:
1128                         goto error;
1129                 }
1130                 break;
1131         case SetPortFeature:
1132                 selector = wIndex >> 8;
1133                 wIndex &= 0xff;
1134                 if (unlikely(ehci->debug)) {
1135                         /* If the debug port is active any port
1136                          * feature requests should get denied */
1137                         if (wIndex == HCS_DEBUG_PORT(ehci->hcs_params) &&
1138                             (readl(&ehci->debug->control) & DBGP_ENABLED)) {
1139                                 retval = -ENODEV;
1140                                 goto error_exit;
1141                         }
1142                 }
1143                 if (!wIndex || wIndex > ports)
1144                         goto error;
1145                 wIndex--;
1146                 temp = ehci_readl(ehci, status_reg);
1147                 if (temp & PORT_OWNER)
1148                         break;
1149
1150                 temp &= ~PORT_RWC_BITS;
1151                 switch (wValue) {
1152                 case USB_PORT_FEAT_SUSPEND:
1153                         if (ehci->no_selective_suspend)
1154                                 break;
1155                         if ((temp & PORT_PE) == 0
1156                                         || (temp & PORT_RESET) != 0)
1157                                 goto error;
1158
1159                         /* After above check the port must be connected.
1160                          * Set appropriate bit thus could put phy into low power
1161                          * mode if we have tdi_phy_lpm feature
1162                          */
1163                         temp &= ~PORT_WKCONN_E;
1164                         temp |= PORT_WKDISC_E | PORT_WKOC_E;
1165                         ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
1166                         if (ehci->has_tdi_phy_lpm) {
1167                                 spin_unlock_irqrestore(&ehci->lock, flags);
1168                                 msleep(5);/* 5ms for HCD enter low pwr mode */
1169                                 spin_lock_irqsave(&ehci->lock, flags);
1170                                 temp1 = ehci_readl(ehci, hostpc_reg);
1171                                 ehci_writel(ehci, temp1 | HOSTPC_PHCD,
1172                                         hostpc_reg);
1173                                 temp1 = ehci_readl(ehci, hostpc_reg);
1174                                 ehci_dbg(ehci, "Port%d phy low pwr mode %s\n",
1175                                         wIndex, (temp1 & HOSTPC_PHCD) ?
1176                                         "succeeded" : "failed");
1177                         }
1178                         set_bit(wIndex, &ehci->suspended_ports);
1179                         break;
1180                 case USB_PORT_FEAT_POWER:
1181                         if (HCS_PPC (ehci->hcs_params))
1182                                 ehci_writel(ehci, temp | PORT_POWER,
1183                                                 status_reg);
1184                         break;
1185                 case USB_PORT_FEAT_RESET:
1186                         if (temp & (PORT_SUSPEND|PORT_RESUME))
1187                                 goto error;
1188                         /* line status bits may report this as low speed,
1189                          * which can be fine if this root hub has a
1190                          * transaction translator built in.
1191                          */
1192                         if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
1193                                         && !ehci_is_TDI(ehci)
1194                                         && PORT_USB11 (temp)) {
1195                                 ehci_dbg (ehci,
1196                                         "port %d low speed --> companion\n",
1197                                         wIndex + 1);
1198                                 temp |= PORT_OWNER;
1199                         } else {
1200                                 temp |= PORT_RESET;
1201                                 temp &= ~PORT_PE;
1202
1203                                 /*
1204                                  * caller must wait, then call GetPortStatus
1205                                  * usb 2.0 spec says 50 ms resets on root
1206                                  */
1207                                 ehci->reset_done [wIndex] = jiffies
1208                                                 + msecs_to_jiffies (50);
1209                         }
1210                         ehci_writel(ehci, temp, status_reg);
1211                         break;
1212
1213                 /* For downstream facing ports (these):  one hub port is put
1214                  * into test mode according to USB2 11.24.2.13, then the hub
1215                  * must be reset (which for root hub now means rmmod+modprobe,
1216                  * or else system reboot).  See EHCI 2.3.9 and 4.14 for info
1217                  * about the EHCI-specific stuff.
1218                  */
1219                 case USB_PORT_FEAT_TEST:
1220 #ifdef CONFIG_USB_HCD_TEST_MODE
1221                         if (selector == EHSET_TEST_SINGLE_STEP_SET_FEATURE) {
1222                                 spin_unlock_irqrestore(&ehci->lock, flags);
1223                                 retval = ehset_single_step_set_feature(hcd,
1224                                                                         wIndex);
1225                                 spin_lock_irqsave(&ehci->lock, flags);
1226                                 break;
1227                         }
1228 #endif
1229                         if (!selector || selector > 5)
1230                                 goto error;
1231                         spin_unlock_irqrestore(&ehci->lock, flags);
1232                         ehci_quiesce(ehci);
1233                         spin_lock_irqsave(&ehci->lock, flags);
1234
1235                         /* Put all enabled ports into suspend */
1236                         while (ports--) {
1237                                 u32 __iomem *sreg =
1238                                                 &ehci->regs->port_status[ports];
1239
1240                                 temp = ehci_readl(ehci, sreg) & ~PORT_RWC_BITS;
1241                                 if (temp & PORT_PE)
1242                                         ehci_writel(ehci, temp | PORT_SUSPEND,
1243                                                         sreg);
1244                         }
1245
1246                         spin_unlock_irqrestore(&ehci->lock, flags);
1247                         ehci_halt(ehci);
1248                         spin_lock_irqsave(&ehci->lock, flags);
1249
1250                         temp = ehci_readl(ehci, status_reg);
1251                         temp |= selector << 16;
1252                         ehci_writel(ehci, temp, status_reg);
1253                         break;
1254
1255                 default:
1256                         goto error;
1257                 }
1258                 ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
1259                 break;
1260
1261         default:
1262 error:
1263                 /* "stall" on error */
1264                 retval = -EPIPE;
1265         }
1266 error_exit:
1267         spin_unlock_irqrestore (&ehci->lock, flags);
1268         return retval;
1269 }
1270
1271 static void ehci_relinquish_port(struct usb_hcd *hcd, int portnum)
1272 {
1273         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1274
1275         if (ehci_is_TDI(ehci))
1276                 return;
1277         set_owner(ehci, --portnum, PORT_OWNER);
1278 }
1279
1280 static int ehci_port_handed_over(struct usb_hcd *hcd, int portnum)
1281 {
1282         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1283         u32 __iomem             *reg;
1284
1285         if (ehci_is_TDI(ehci))
1286                 return 0;
1287         reg = &ehci->regs->port_status[portnum - 1];
1288         return ehci_readl(ehci, reg) & PORT_OWNER;
1289 }