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 persist_enabled_on_companion(struct usb_device *udev, void *unused)
  37 {
  38         return !udev->maxchild && udev->persist_enabled &&
  39                 udev->bus->root_hub->speed < USB_SPEED_HIGH;
  40 }
  41
  42 /* After a power loss, ports that were owned by the companion must be
  43  * reset so that the companion can still own them.
  44  */
  45 static void ehci_handover_companion_ports(struct ehci_hcd *ehci)
  46 {
  47         u32 __iomem     *reg;
  48         u32             status;
  49         int             port;
  50         __le32          buf;
  51         struct usb_hcd  *hcd = ehci_to_hcd(ehci);
  52
  53         if (!ehci->owned_ports)
  54                 return;
  55
  56         /*
  57          * USB 1.1 devices are mostly HIDs, which don't need to persist across
  58          * suspends. If we ensure that none of our companion's devices have
  59          * persist_enabled (by looking through all USB 1.1 buses in the system),
  60          * we can skip this and avoid slowing resume down. Devices without
  61          * persist will just get reenumerated shortly after resume anyway.
  62          */
  63         if (!usb_for_each_dev(NULL, persist_enabled_on_companion))
  64                 return;
  65
  66         /* Make sure the ports are powered */
  67         port = HCS_N_PORTS(ehci->hcs_params);
  68         while (port--) {
  69                 if (test_bit(port, &ehci->owned_ports)) {
  70                         reg = &ehci->regs->port_status[port];
  71                         status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
  72                         if (!(status & PORT_POWER)) {
  73                                 status |= PORT_POWER;
  74                                 ehci_writel(ehci, status, reg);
  75                         }
  76                 }
  77         }
  78
  79         /* Give the connections some time to appear */
  80         msleep(20);
  81
  82         spin_lock_irq(&ehci->lock);
  83         port = HCS_N_PORTS(ehci->hcs_params);
  84         while (port--) {
  85                 if (test_bit(port, &ehci->owned_ports)) {
  86                         reg = &ehci->regs->port_status[port];
  87                         status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
  88
  89                         /* Port already owned by companion? */
  90                         if (status & PORT_OWNER)
  91                                 clear_bit(port, &ehci->owned_ports);
  92                         else if (test_bit(port, &ehci->companion_ports))
  93                                 ehci_writel(ehci, status & ~PORT_PE, reg);
  94                         else {
  95                                 spin_unlock_irq(&ehci->lock);
  96                                 ehci_hub_control(hcd, SetPortFeature,
  97                                                 USB_PORT_FEAT_RESET, port + 1,
  98                                                 NULL, 0);
  99                                 spin_lock_irq(&ehci->lock);
 100                         }
 101                 }
 102         }
 103         spin_unlock_irq(&ehci->lock);
 104
 105         if (!ehci->owned_ports)
 106                 return;
 107         msleep(90);             /* Wait for resets to complete */
 108
 109         spin_lock_irq(&ehci->lock);
 110         port = HCS_N_PORTS(ehci->hcs_params);
 111         while (port--) {
 112                 if (test_bit(port, &ehci->owned_ports)) {
 113                         spin_unlock_irq(&ehci->lock);
 114                         ehci_hub_control(hcd, GetPortStatus,
 115                                         0, port + 1,
 116                                         (char *) &buf, sizeof(buf));
 117                         spin_lock_irq(&ehci->lock);
 118
 119                         /* The companion should now own the port,
 120                          * but if something went wrong the port must not
 121                          * remain enabled.
 122                          */
 123                         reg = &ehci->regs->port_status[port];
 124                         status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
 125                         if (status & PORT_OWNER)
 126                                 ehci_writel(ehci, status | PORT_CSC, reg);
 127                         else {
 128                                 ehci_dbg(ehci, "failed handover port %d: %x\n",
 129                                                 port + 1, status);
 130                                 ehci_writel(ehci, status & ~PORT_PE, reg);
 131                         }
 132                 }
 133         }
 134
 135         ehci->owned_ports = 0;
 136         spin_unlock_irq(&ehci->lock);
 137 }
 138
 139 static int ehci_port_change(struct ehci_hcd *ehci)
 140 {
 141         int i = HCS_N_PORTS(ehci->hcs_params);
 142
 143         /* First check if the controller indicates a change event */
 144
 145         if (ehci_readl(ehci, &ehci->regs->status) & STS_PCD)
 146                 return 1;
 147
 148         /*
 149          * Not all controllers appear to update this while going from D3 to D0,
 150          * so check the individual port status registers as well
 151          */
 152
 153         while (i--)
 154                 if (ehci_readl(ehci, &ehci->regs->port_status[i]) & PORT_CSC)
 155                         return 1;
 156
 157         return 0;
 158 }
 159
 160 static void ehci_adjust_port_wakeup_flags(struct ehci_hcd *ehci,
 161                 bool suspending, bool do_wakeup)
 162 {
 163         int             port;
 164         u32             temp;
 165
 166         /* If remote wakeup is enabled for the root hub but disabled
 167          * for the controller, we must adjust all the port wakeup flags
 168          * when the controller is suspended or resumed.  In all other
 169          * cases they don't need to be changed.
 170          */
 171         if (!ehci_to_hcd(ehci)->self.root_hub->do_remote_wakeup || do_wakeup)
 172                 return;
 173
 174         spin_lock_irq(&ehci->lock);
 175
 176         /* clear phy low-power mode before changing wakeup flags */
 177         if (ehci->has_tdi_phy_lpm) {
 178                 port = HCS_N_PORTS(ehci->hcs_params);
 179                 while (port--) {
 180                         u32 __iomem     *hostpc_reg = &ehci->regs->hostpc[port];
 181
 182                         temp = ehci_readl(ehci, hostpc_reg);
 183                         ehci_writel(ehci, temp & ~HOSTPC_PHCD, hostpc_reg);
 184                 }
 185                 spin_unlock_irq(&ehci->lock);
 186                 msleep(5);
 187                 spin_lock_irq(&ehci->lock);
 188         }
 189
 190         port = HCS_N_PORTS(ehci->hcs_params);
 191         while (port--) {
 192                 u32 __iomem     *reg = &ehci->regs->port_status[port];
 193                 u32             t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
 194                 u32             t2 = t1 & ~PORT_WAKE_BITS;
 195
 196                 /* If we are suspending the controller, clear the flags.
 197                  * If we are resuming the controller, set the wakeup flags.
 198                  */
 199                 if (!suspending) {
 200                         if (t1 & PORT_CONNECT)
 201                                 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
 202                         else
 203                                 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
 204                 }
 205                 ehci_writel(ehci, t2, reg);
 206         }
 207
 208         /* enter phy low-power mode again */
 209         if (ehci->has_tdi_phy_lpm) {
 210                 port = HCS_N_PORTS(ehci->hcs_params);
 211                 while (port--) {
 212                         u32 __iomem     *hostpc_reg = &ehci->regs->hostpc[port];
 213
 214                         temp = ehci_readl(ehci, hostpc_reg);
 215                         ehci_writel(ehci, temp | HOSTPC_PHCD, hostpc_reg);
 216                 }
 217         }
 218
 219         /* Does the root hub have a port wakeup pending? */
 220         if (!suspending && ehci_port_change(ehci))
 221                 usb_hcd_resume_root_hub(ehci_to_hcd(ehci));
 222
 223         spin_unlock_irq(&ehci->lock);
 224 }
 225
 226 static int ehci_bus_suspend (struct usb_hcd *hcd)
 227 {
 228         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 229         int                     port;
 230         int                     mask;
 231         int                     changed;
 232         bool                    fs_idle_delay;
 233
 234         ehci_dbg(ehci, "suspend root hub\n");
 235
 236         if (time_before (jiffies, ehci->next_statechange))
 237                 msleep(5);
 238
 239         /* stop the schedules */
 240         ehci_quiesce(ehci);
 241
 242         spin_lock_irq (&ehci->lock);
 243         if (ehci->rh_state < EHCI_RH_RUNNING)
 244                 goto done;
 245
 246         /* Once the controller is stopped, port resumes that are already
 247          * in progress won't complete.  Hence if remote wakeup is enabled
 248          * for the root hub and any ports are in the middle of a resume or
 249          * remote wakeup, we must fail the suspend.
 250          */
 251         if (hcd->self.root_hub->do_remote_wakeup) {
 252                 if (ehci->resuming_ports) {
 253                         spin_unlock_irq(&ehci->lock);
 254                         ehci_dbg(ehci, "suspend failed because a port is resuming\n");
 255                         return -EBUSY;
 256                 }
 257         }
 258
 259         /* Unlike other USB host controller types, EHCI doesn't have
 260          * any notion of "global" or bus-wide suspend.  The driver has
 261          * to manually suspend all the active unsuspended ports, and
 262          * then manually resume them in the bus_resume() routine.
 263          */
 264         ehci->bus_suspended = 0;
 265         ehci->owned_ports = 0;
 266         changed = 0;
 267         fs_idle_delay = false;
 268         port = HCS_N_PORTS(ehci->hcs_params);
 269         while (port--) {
 270                 u32 __iomem     *reg = &ehci->regs->port_status [port];
 271                 u32             t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
 272                 u32             t2 = t1 & ~PORT_WAKE_BITS;
 273
 274                 /* keep track of which ports we suspend */
 275                 if (t1 & PORT_OWNER)
 276                         set_bit(port, &ehci->owned_ports);
 277                 else if ((t1 & PORT_PE) && !(t1 & PORT_SUSPEND)) {
 278                         t2 |= PORT_SUSPEND;
 279                         set_bit(port, &ehci->bus_suspended);
 280                 }
 281
 282                 /* enable remote wakeup on all ports, if told to do so */
 283                 if (hcd->self.root_hub->do_remote_wakeup) {
 284                         /* only enable appropriate wake bits, otherwise the
 285                          * hardware can not go phy low power mode. If a race
 286                          * condition happens here(connection change during bits
 287                          * set), the port change detection will finally fix it.
 288                          */
 289                         if (t1 & PORT_CONNECT)
 290                                 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
 291                         else
 292                                 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
 293                 }
 294
 295                 if (t1 != t2) {
 296                         /*
 297                          * On some controllers, Wake-On-Disconnect will
 298                          * generate false wakeup signals until the bus
 299                          * switches over to full-speed idle.  For their
 300                          * sake, add a delay if we need one.
 301                          */
 302                         if ((t2 & PORT_WKDISC_E) &&
 303                                         ehci_port_speed(ehci, t2) ==
 304                                                 USB_PORT_STAT_HIGH_SPEED)
 305                                 fs_idle_delay = true;
 306                         ehci_writel(ehci, t2, reg);
 307                         changed = 1;
 308                 }
 309         }
 310         spin_unlock_irq(&ehci->lock);
 311
 312         if ((changed && ehci->has_tdi_phy_lpm) || fs_idle_delay) {
 313                 /*
 314                  * Wait for HCD to enter low-power mode or for the bus
 315                  * to switch to full-speed idle.
 316                  */
 317                 usleep_range(5000, 5500);
 318         }
 319
 320         if (changed && ehci->has_tdi_phy_lpm) {
 321                 spin_lock_irq(&ehci->lock);
 322                 port = HCS_N_PORTS(ehci->hcs_params);
 323                 while (port--) {
 324                         u32 __iomem     *hostpc_reg = &ehci->regs->hostpc[port];
 325                         u32             t3;
 326
 327                         t3 = ehci_readl(ehci, hostpc_reg);
 328                         ehci_writel(ehci, t3 | HOSTPC_PHCD, hostpc_reg);
 329                         t3 = ehci_readl(ehci, hostpc_reg);
 330                         ehci_dbg(ehci, "Port %d phy low-power mode %s\n",
 331                                         port, (t3 & HOSTPC_PHCD) ?
 332                                         "succeeded" : "failed");
 333                 }
 334                 spin_unlock_irq(&ehci->lock);
 335         }
 336
 337         /* Apparently some devices need a >= 1-uframe delay here */
 338         if (ehci->bus_suspended)
 339                 udelay(150);
 340
 341         /* turn off now-idle HC */
 342         ehci_halt (ehci);
 343
 344         spin_lock_irq(&ehci->lock);
 345         if (ehci->enabled_hrtimer_events & BIT(EHCI_HRTIMER_POLL_DEAD))
 346                 ehci_handle_controller_death(ehci);
 347         if (ehci->rh_state != EHCI_RH_RUNNING)
 348                 goto done;
 349         ehci->rh_state = EHCI_RH_SUSPENDED;
 350
 351         end_unlink_async(ehci);
 352         unlink_empty_async_suspended(ehci);
 353         ehci_handle_start_intr_unlinks(ehci);
 354         ehci_handle_intr_unlinks(ehci);
 355         end_free_itds(ehci);
 356
 357         /* allow remote wakeup */
 358         mask = INTR_MASK;
 359         if (!hcd->self.root_hub->do_remote_wakeup)
 360                 mask &= ~STS_PCD;
 361         ehci_writel(ehci, mask, &ehci->regs->intr_enable);
 362         ehci_readl(ehci, &ehci->regs->intr_enable);
 363
 364  done:
 365         ehci->next_statechange = jiffies + msecs_to_jiffies(10);
 366         ehci->enabled_hrtimer_events = 0;
 367         ehci->next_hrtimer_event = EHCI_HRTIMER_NO_EVENT;
 368         spin_unlock_irq (&ehci->lock);
 369
 370         hrtimer_cancel(&ehci->hrtimer);
 371         return 0;
 372 }
 373
 374
 375 /* caller has locked the root hub, and should reset/reinit on error */
 376 static int ehci_bus_resume (struct usb_hcd *hcd)
 377 {
 378         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 379         u32                     temp;
 380         u32                     power_okay;
 381         int                     i;
 382         unsigned long           resume_needed = 0;
 383
 384         if (time_before (jiffies, ehci->next_statechange))
 385                 msleep(5);
 386         spin_lock_irq (&ehci->lock);
 387         if (!HCD_HW_ACCESSIBLE(hcd) || ehci->shutdown)
 388                 goto shutdown;
 389
 390         if (unlikely(ehci->debug)) {
 391                 if (!dbgp_reset_prep(hcd))
 392                         ehci->debug = NULL;
 393                 else
 394                         dbgp_external_startup(hcd);
 395         }
 396
 397         /* Ideally and we've got a real resume here, and no port's power
 398          * was lost.  (For PCI, that means Vaux was maintained.)  But we
 399          * could instead be restoring a swsusp snapshot -- so that BIOS was
 400          * the last user of the controller, not reset/pm hardware keeping
 401          * state we gave to it.
 402          */
 403         power_okay = ehci_readl(ehci, &ehci->regs->intr_enable);
 404         ehci_dbg(ehci, "resume root hub%s\n",
 405                         power_okay ? "" : " after power loss");
 406
 407         /* at least some APM implementations will try to deliver
 408          * IRQs right away, so delay them until we're ready.
 409          */
 410         ehci_writel(ehci, 0, &ehci->regs->intr_enable);
 411
 412         /* re-init operational registers */
 413         ehci_writel(ehci, 0, &ehci->regs->segment);
 414         ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
 415         ehci_writel(ehci, (u32) ehci->async->qh_dma, &ehci->regs->async_next);
 416
 417         /* restore CMD_RUN, framelist size, and irq threshold */
 418         ehci->command |= CMD_RUN;
 419         ehci_writel(ehci, ehci->command, &ehci->regs->command);
 420         ehci->rh_state = EHCI_RH_RUNNING;
 421
 422         /*
 423          * According to Bugzilla #8190, the port status for some controllers
 424          * will be wrong without a delay. At their wrong status, the port
 425          * is enabled, but not suspended neither resumed.
 426          */
 427         i = HCS_N_PORTS(ehci->hcs_params);
 428         while (i--) {
 429                 temp = ehci_readl(ehci, &ehci->regs->port_status[i]);
 430                 if ((temp & PORT_PE) &&
 431                                 !(temp & (PORT_SUSPEND | PORT_RESUME))) {
 432                         ehci_dbg(ehci, "Port status(0x%x) is wrong\n", temp);
 433                         spin_unlock_irq(&ehci->lock);
 434                         msleep(8);
 435                         spin_lock_irq(&ehci->lock);
 436                         break;
 437                 }
 438         }
 439
 440         if (ehci->shutdown)
 441                 goto shutdown;
 442
 443         /* clear phy low-power mode before resume */
 444         if (ehci->bus_suspended && ehci->has_tdi_phy_lpm) {
 445                 i = HCS_N_PORTS(ehci->hcs_params);
 446                 while (i--) {
 447                         if (test_bit(i, &ehci->bus_suspended)) {
 448                                 u32 __iomem     *hostpc_reg =
 449                                                         &ehci->regs->hostpc[i];
 450
 451                                 temp = ehci_readl(ehci, hostpc_reg);
 452                                 ehci_writel(ehci, temp & ~HOSTPC_PHCD,
 453                                                 hostpc_reg);
 454                         }
 455                 }
 456                 spin_unlock_irq(&ehci->lock);
 457                 msleep(5);
 458                 spin_lock_irq(&ehci->lock);
 459                 if (ehci->shutdown)
 460                         goto shutdown;
 461         }
 462
 463         /* manually resume the ports we suspended during bus_suspend() */
 464         i = HCS_N_PORTS (ehci->hcs_params);
 465         while (i--) {
 466                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 467                 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
 468                 if (test_bit(i, &ehci->bus_suspended) &&
 469                                 (temp & PORT_SUSPEND)) {
 470                         temp |= PORT_RESUME;
 471                         set_bit(i, &resume_needed);
 472                 }
 473                 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
 474         }
 475
 476         /* msleep for 20ms only if code is trying to resume port */
 477         if (resume_needed) {
 478                 spin_unlock_irq(&ehci->lock);
 479                 msleep(20);
 480                 spin_lock_irq(&ehci->lock);
 481                 if (ehci->shutdown)
 482                         goto shutdown;
 483         }
 484
 485         i = HCS_N_PORTS (ehci->hcs_params);
 486         while (i--) {
 487                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 488                 if (test_bit(i, &resume_needed)) {
 489                         temp &= ~(PORT_RWC_BITS | PORT_SUSPEND | PORT_RESUME);
 490                         ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
 491                 }
 492         }
 493
 494         ehci->next_statechange = jiffies + msecs_to_jiffies(5);
 495         spin_unlock_irq(&ehci->lock);
 496
 497         ehci_handover_companion_ports(ehci);
 498
 499         /* Now we can safely re-enable irqs */
 500         spin_lock_irq(&ehci->lock);
 501         if (ehci->shutdown)
 502                 goto shutdown;
 503         ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
 504         (void) ehci_readl(ehci, &ehci->regs->intr_enable);
 505         spin_unlock_irq(&ehci->lock);
 506
 507         return 0;
 508
 509  shutdown:
 510         spin_unlock_irq(&ehci->lock);
 511         return -ESHUTDOWN;
 512 }
 513
 514 #else
 515
 516 #define ehci_bus_suspend        NULL
 517 #define ehci_bus_resume         NULL
 518
 519 #endif  /* CONFIG_PM */
 520
 521 /*-------------------------------------------------------------------------*/
 522
 523 /*
 524  * Sets the owner of a port
 525  */
 526 static void set_owner(struct ehci_hcd *ehci, int portnum, int new_owner)
 527 {
 528         u32 __iomem             *status_reg;
 529         u32                     port_status;
 530         int                     try;
 531
 532         status_reg = &ehci->regs->port_status[portnum];
 533
 534         /*
 535          * The controller won't set the OWNER bit if the port is
 536          * enabled, so this loop will sometimes require at least two
 537          * iterations: one to disable the port and one to set OWNER.
 538          */
 539         for (try = 4; try > 0; --try) {
 540                 spin_lock_irq(&ehci->lock);
 541                 port_status = ehci_readl(ehci, status_reg);
 542                 if ((port_status & PORT_OWNER) == new_owner
 543                                 || (port_status & (PORT_OWNER | PORT_CONNECT))
 544                                         == 0)
 545                         try = 0;
 546                 else {
 547                         port_status ^= PORT_OWNER;
 548                         port_status &= ~(PORT_PE | PORT_RWC_BITS);
 549                         ehci_writel(ehci, port_status, status_reg);
 550                 }
 551                 spin_unlock_irq(&ehci->lock);
 552                 if (try > 1)
 553                         msleep(5);
 554         }
 555 }
 556
 557 /*-------------------------------------------------------------------------*/
 558
 559 static int check_reset_complete (
 560         struct ehci_hcd *ehci,
 561         int             index,
 562         u32 __iomem     *status_reg,
 563         int             port_status
 564 ) {
 565         if (!(port_status & PORT_CONNECT))
 566                 return port_status;
 567
 568         /* if reset finished and it's still not enabled -- handoff */
 569         if (!(port_status & PORT_PE)) {
 570
 571                 /* with integrated TT, there's nobody to hand it to! */
 572                 if (ehci_is_TDI(ehci)) {
 573                         ehci_dbg (ehci,
 574                                 "Failed to enable port %d on root hub TT\n",
 575                                 index+1);
 576                         return port_status;
 577                 }
 578
 579                 ehci_dbg (ehci, "port %d full speed --> companion\n",
 580                         index + 1);
 581
 582                 // what happens if HCS_N_CC(params) == 0 ?
 583                 port_status |= PORT_OWNER;
 584                 port_status &= ~PORT_RWC_BITS;
 585                 ehci_writel(ehci, port_status, status_reg);
 586
 587                 /* ensure 440EPX ohci controller state is operational */
 588                 if (ehci->has_amcc_usb23)
 589                         set_ohci_hcfs(ehci, 1);
 590         } else {
 591                 ehci_dbg(ehci, "port %d reset complete, port enabled\n",
 592                         index + 1);
 593                 /* ensure 440EPx ohci controller state is suspended */
 594                 if (ehci->has_amcc_usb23)
 595                         set_ohci_hcfs(ehci, 0);
 596         }
 597
 598         return port_status;
 599 }
 600
 601 /*-------------------------------------------------------------------------*/
 602
 603
 604 /* build "status change" packet (one or two bytes) from HC registers */
 605
 606 static int
 607 ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
 608 {
 609         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 610         u32             temp, status;
 611         u32             mask;
 612         int             ports, i, retval = 1;
 613         unsigned long   flags;
 614         u32             ppcd = ~0;
 615
 616         /* init status to no-changes */
 617         buf [0] = 0;
 618         ports = HCS_N_PORTS (ehci->hcs_params);
 619         if (ports > 7) {
 620                 buf [1] = 0;
 621                 retval++;
 622         }
 623
 624         /* Inform the core about resumes-in-progress by returning
 625          * a non-zero value even if there are no status changes.
 626          */
 627         status = ehci->resuming_ports;
 628
 629         /* Some boards (mostly VIA?) report bogus overcurrent indications,
 630          * causing massive log spam unless we completely ignore them.  It
 631          * may be relevant that VIA VT8235 controllers, where PORT_POWER is
 632          * always set, seem to clear PORT_OCC and PORT_CSC when writing to
 633          * PORT_POWER; that's surprising, but maybe within-spec.
 634          */
 635         if (!ignore_oc)
 636                 mask = PORT_CSC | PORT_PEC | PORT_OCC;
 637         else
 638                 mask = PORT_CSC | PORT_PEC;
 639         // PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
 640
 641         /* no hub change reports (bit 0) for now (power, ...) */
 642
 643         /* port N changes (bit N)? */
 644         spin_lock_irqsave (&ehci->lock, flags);
 645
 646         /* get per-port change detect bits */
 647         if (ehci->has_ppcd)
 648                 ppcd = ehci_readl(ehci, &ehci->regs->status) >> 16;
 649
 650         for (i = 0; i < ports; i++) {
 651                 /* leverage per-port change bits feature */
 652                 if (ppcd & (1 << i))
 653                         temp = ehci_readl(ehci, &ehci->regs->port_status[i]);
 654                 else
 655                         temp = 0;
 656
 657                 /*
 658                  * Return status information even for ports with OWNER set.
 659                  * Otherwise khubd wouldn't see the disconnect event when a
 660                  * high-speed device is switched over to the companion
 661                  * controller by the user.
 662                  */
 663
 664                 if ((temp & mask) != 0 || test_bit(i, &ehci->port_c_suspend)
 665                                 || (ehci->reset_done[i] && time_after_eq(
 666                                         jiffies, ehci->reset_done[i]))) {
 667                         if (i < 7)
 668                             buf [0] |= 1 << (i + 1);
 669                         else
 670                             buf [1] |= 1 << (i - 7);
 671                         status = STS_PCD;
 672                 }
 673         }
 674
 675         /* If a resume is in progress, make sure it can finish */
 676         if (ehci->resuming_ports)
 677                 mod_timer(&hcd->rh_timer, jiffies + msecs_to_jiffies(25));
 678
 679         spin_unlock_irqrestore (&ehci->lock, flags);
 680         return status ? retval : 0;
 681 }
 682
 683 /*-------------------------------------------------------------------------*/
 684
 685 static void
 686 ehci_hub_descriptor (
 687         struct ehci_hcd                 *ehci,
 688         struct usb_hub_descriptor       *desc
 689 ) {
 690         int             ports = HCS_N_PORTS (ehci->hcs_params);
 691         u16             temp;
 692
 693         desc->bDescriptorType = 0x29;
 694         desc->bPwrOn2PwrGood = 10;      /* ehci 1.0, 2.3.9 says 20ms max */
 695         desc->bHubContrCurrent = 0;
 696
 697         desc->bNbrPorts = ports;
 698         temp = 1 + (ports / 8);
 699         desc->bDescLength = 7 + 2 * temp;
 700
 701         /* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
 702         memset(&desc->u.hs.DeviceRemovable[0], 0, temp);
 703         memset(&desc->u.hs.DeviceRemovable[temp], 0xff, temp);
 704
 705         temp = 0x0008;                  /* per-port overcurrent reporting */
 706         if (HCS_PPC (ehci->hcs_params))
 707                 temp |= 0x0001;         /* per-port power control */
 708         else
 709                 temp |= 0x0002;         /* no power switching */
 710 #if 0
 711 // re-enable when we support USB_PORT_FEAT_INDICATOR below.
 712         if (HCS_INDICATOR (ehci->hcs_params))
 713                 temp |= 0x0080;         /* per-port indicators (LEDs) */
 714 #endif
 715         desc->wHubCharacteristics = cpu_to_le16(temp);
 716 }
 717
 718 /*-------------------------------------------------------------------------*/
 719 #ifdef CONFIG_USB_HCD_TEST_MODE
 720
 721 #define EHSET_TEST_SINGLE_STEP_SET_FEATURE 0x06
 722
 723 static void usb_ehset_completion(struct urb *urb)
 724 {
 725         struct completion  *done = urb->context;
 726
 727         complete(done);
 728 }
 729 static int submit_single_step_set_feature(
 730         struct usb_hcd  *hcd,
 731         struct urb      *urb,
 732         int             is_setup
 733 );
 734
 735 /*
 736  * Allocate and initialize a control URB. This request will be used by the
 737  * EHSET SINGLE_STEP_SET_FEATURE test in which the DATA and STATUS stages
 738  * of the GetDescriptor request are sent 15 seconds after the SETUP stage.
 739  * Return NULL if failed.
 740  */
 741 static struct urb *request_single_step_set_feature_urb(
 742         struct usb_device       *udev,
 743         void                    *dr,
 744         void                    *buf,
 745         struct completion       *done
 746 ) {
 747         struct urb *urb;
 748         struct usb_hcd *hcd = bus_to_hcd(udev->bus);
 749         struct usb_host_endpoint *ep;
 750
 751         urb = usb_alloc_urb(0, GFP_KERNEL);
 752         if (!urb)
 753                 return NULL;
 754
 755         urb->pipe = usb_rcvctrlpipe(udev, 0);
 756         ep = (usb_pipein(urb->pipe) ? udev->ep_in : udev->ep_out)
 757                                 [usb_pipeendpoint(urb->pipe)];
 758         if (!ep) {
 759                 usb_free_urb(urb);
 760                 return NULL;
 761         }
 762
 763         urb->ep = ep;
 764         urb->dev = udev;
 765         urb->setup_packet = (void *)dr;
 766         urb->transfer_buffer = buf;
 767         urb->transfer_buffer_length = USB_DT_DEVICE_SIZE;
 768         urb->complete = usb_ehset_completion;
 769         urb->status = -EINPROGRESS;
 770         urb->actual_length = 0;
 771         urb->transfer_flags = URB_DIR_IN;
 772         usb_get_urb(urb);
 773         atomic_inc(&urb->use_count);
 774         atomic_inc(&urb->dev->urbnum);
 775         urb->setup_dma = dma_map_single(
 776                         hcd->self.controller,
 777                         urb->setup_packet,
 778                         sizeof(struct usb_ctrlrequest),
 779                         DMA_TO_DEVICE);
 780         urb->transfer_dma = dma_map_single(
 781                         hcd->self.controller,
 782                         urb->transfer_buffer,
 783                         urb->transfer_buffer_length,
 784                         DMA_FROM_DEVICE);
 785         urb->context = done;
 786         return urb;
 787 }
 788
 789 static int ehset_single_step_set_feature(struct usb_hcd *hcd, int port)
 790 {
 791         int retval = -ENOMEM;
 792         struct usb_ctrlrequest *dr;
 793         struct urb *urb;
 794         struct usb_device *udev;
 795         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 796         struct usb_device_descriptor *buf;
 797         DECLARE_COMPLETION_ONSTACK(done);
 798
 799         /* Obtain udev of the rhub's child port */
 800         udev = usb_hub_find_child(hcd->self.root_hub, port);
 801         if (!udev) {
 802                 ehci_err(ehci, "No device attached to the RootHub\n");
 803                 return -ENODEV;
 804         }
 805         buf = kmalloc(USB_DT_DEVICE_SIZE, GFP_KERNEL);
 806         if (!buf)
 807                 return -ENOMEM;
 808
 809         dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
 810         if (!dr) {
 811                 kfree(buf);
 812                 return -ENOMEM;
 813         }
 814
 815         /* Fill Setup packet for GetDescriptor */
 816         dr->bRequestType = USB_DIR_IN;
 817         dr->bRequest = USB_REQ_GET_DESCRIPTOR;
 818         dr->wValue = cpu_to_le16(USB_DT_DEVICE << 8);
 819         dr->wIndex = 0;
 820         dr->wLength = cpu_to_le16(USB_DT_DEVICE_SIZE);
 821         urb = request_single_step_set_feature_urb(udev, dr, buf, &done);
 822         if (!urb)
 823                 goto cleanup;
 824
 825         /* Submit just the SETUP stage */
 826         retval = submit_single_step_set_feature(hcd, urb, 1);
 827         if (retval)
 828                 goto out1;
 829         if (!wait_for_completion_timeout(&done, msecs_to_jiffies(2000))) {
 830                 usb_kill_urb(urb);
 831                 retval = -ETIMEDOUT;
 832                 ehci_err(ehci, "%s SETUP stage timed out on ep0\n", __func__);
 833                 goto out1;
 834         }
 835         msleep(15 * 1000);
 836
 837         /* Complete remaining DATA and STATUS stages using the same URB */
 838         urb->status = -EINPROGRESS;
 839         usb_get_urb(urb);
 840         atomic_inc(&urb->use_count);
 841         atomic_inc(&urb->dev->urbnum);
 842         retval = submit_single_step_set_feature(hcd, urb, 0);
 843         if (!retval && !wait_for_completion_timeout(&done,
 844                                                 msecs_to_jiffies(2000))) {
 845                 usb_kill_urb(urb);
 846                 retval = -ETIMEDOUT;
 847                 ehci_err(ehci, "%s IN stage timed out on ep0\n", __func__);
 848         }
 849 out1:
 850         usb_free_urb(urb);
 851 cleanup:
 852         kfree(dr);
 853         kfree(buf);
 854         return retval;
 855 }
 856 #endif /* CONFIG_USB_HCD_TEST_MODE */
 857 /*-------------------------------------------------------------------------*/
 858
 859 int ehci_hub_control(
 860         struct usb_hcd  *hcd,
 861         u16             typeReq,
 862         u16             wValue,
 863         u16             wIndex,
 864         char            *buf,
 865         u16             wLength
 866 ) {
 867         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 868         int             ports = HCS_N_PORTS (ehci->hcs_params);
 869         u32 __iomem     *status_reg = &ehci->regs->port_status[
 870                                 (wIndex & 0xff) - 1];
 871         u32 __iomem     *hostpc_reg = &ehci->regs->hostpc[(wIndex & 0xff) - 1];
 872         u32             temp, temp1, status;
 873         unsigned long   flags;
 874         int             retval = 0;
 875         unsigned        selector;
 876
 877         /*
 878          * FIXME:  support SetPortFeatures USB_PORT_FEAT_INDICATOR.
 879          * HCS_INDICATOR may say we can change LEDs to off/amber/green.
 880          * (track current state ourselves) ... blink for diagnostics,
 881          * power, "this is the one", etc.  EHCI spec supports this.
 882          */
 883
 884         spin_lock_irqsave (&ehci->lock, flags);
 885         switch (typeReq) {
 886         case ClearHubFeature:
 887                 switch (wValue) {
 888                 case C_HUB_LOCAL_POWER:
 889                 case C_HUB_OVER_CURRENT:
 890                         /* no hub-wide feature/status flags */
 891                         break;
 892                 default:
 893                         goto error;
 894                 }
 895                 break;
 896         case ClearPortFeature:
 897                 if (!wIndex || wIndex > ports)
 898                         goto error;
 899                 wIndex--;
 900                 temp = ehci_readl(ehci, status_reg);
 901                 temp &= ~PORT_RWC_BITS;
 902
 903                 /*
 904                  * Even if OWNER is set, so the port is owned by the
 905                  * companion controller, khubd needs to be able to clear
 906                  * the port-change status bits (especially
 907                  * USB_PORT_STAT_C_CONNECTION).
 908                  */
 909
 910                 switch (wValue) {
 911                 case USB_PORT_FEAT_ENABLE:
 912                         ehci_writel(ehci, temp & ~PORT_PE, status_reg);
 913                         break;
 914                 case USB_PORT_FEAT_C_ENABLE:
 915                         ehci_writel(ehci, temp | PORT_PEC, status_reg);
 916                         break;
 917                 case USB_PORT_FEAT_SUSPEND:
 918                         if (temp & PORT_RESET)
 919                                 goto error;
 920                         if (ehci->no_selective_suspend)
 921                                 break;
 922 #ifdef CONFIG_USB_OTG
 923                         if ((hcd->self.otg_port == (wIndex + 1))
 924                             && hcd->self.b_hnp_enable) {
 925                                 otg_start_hnp(hcd->phy->otg);
 926                                 break;
 927                         }
 928 #endif
 929                         if (!(temp & PORT_SUSPEND))
 930                                 break;
 931                         if ((temp & PORT_PE) == 0)
 932                                 goto error;
 933
 934                         /* clear phy low-power mode before resume */
 935                         if (ehci->has_tdi_phy_lpm) {
 936                                 temp1 = ehci_readl(ehci, hostpc_reg);
 937                                 ehci_writel(ehci, temp1 & ~HOSTPC_PHCD,
 938                                                 hostpc_reg);
 939                                 spin_unlock_irqrestore(&ehci->lock, flags);
 940                                 msleep(5);/* wait to leave low-power mode */
 941                                 spin_lock_irqsave(&ehci->lock, flags);
 942                         }
 943                         /* resume signaling for 20 msec */
 944                         temp &= ~PORT_WAKE_BITS;
 945                         ehci_writel(ehci, temp | PORT_RESUME, status_reg);
 946                         ehci->reset_done[wIndex] = jiffies
 947                                         + msecs_to_jiffies(20);
 948                         set_bit(wIndex, &ehci->resuming_ports);
 949                         usb_hcd_start_port_resume(&hcd->self, wIndex);
 950                         break;
 951                 case USB_PORT_FEAT_C_SUSPEND:
 952                         clear_bit(wIndex, &ehci->port_c_suspend);
 953                         break;
 954                 case USB_PORT_FEAT_POWER:
 955                         if (HCS_PPC (ehci->hcs_params))
 956                                 ehci_writel(ehci, temp & ~PORT_POWER,
 957                                                 status_reg);
 958                         break;
 959                 case USB_PORT_FEAT_C_CONNECTION:
 960                         ehci_writel(ehci, temp | PORT_CSC, status_reg);
 961                         break;
 962                 case USB_PORT_FEAT_C_OVER_CURRENT:
 963                         ehci_writel(ehci, temp | PORT_OCC, status_reg);
 964                         break;
 965                 case USB_PORT_FEAT_C_RESET:
 966                         /* GetPortStatus clears reset */
 967                         break;
 968                 default:
 969                         goto error;
 970                 }
 971                 ehci_readl(ehci, &ehci->regs->command); /* unblock posted write */
 972                 break;
 973         case GetHubDescriptor:
 974                 ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
 975                         buf);
 976                 break;
 977         case GetHubStatus:
 978                 /* no hub-wide feature/status flags */
 979                 memset (buf, 0, 4);
 980                 //cpu_to_le32s ((u32 *) buf);
 981                 break;
 982         case GetPortStatus:
 983                 if (!wIndex || wIndex > ports)
 984                         goto error;
 985                 wIndex--;
 986                 status = 0;
 987                 temp = ehci_readl(ehci, status_reg);
 988
 989                 // wPortChange bits
 990                 if (temp & PORT_CSC)
 991                         status |= USB_PORT_STAT_C_CONNECTION << 16;
 992                 if (temp & PORT_PEC)
 993                         status |= USB_PORT_STAT_C_ENABLE << 16;
 994
 995                 if ((temp & PORT_OCC) && !ignore_oc){
 996                         status |= USB_PORT_STAT_C_OVERCURRENT << 16;
 997
 998                         /*
 999                          * Hubs should disable port power on over-current.
1000                          * However, not all EHCI implementations do this
1001                          * automatically, even if they _do_ support per-port
1002                          * power switching; they're allowed to just limit the
1003                          * current.  khubd will turn the power back on.
1004                          */
1005                         if (((temp & PORT_OC) || (ehci->need_oc_pp_cycle))
1006                                         && HCS_PPC(ehci->hcs_params)) {
1007                                 ehci_writel(ehci,
1008                                         temp & ~(PORT_RWC_BITS | PORT_POWER),
1009                                         status_reg);
1010                                 temp = ehci_readl(ehci, status_reg);
1011                         }
1012                 }
1013
1014                 /* no reset or resume pending */
1015                 if (!ehci->reset_done[wIndex]) {
1016
1017                         /* Remote Wakeup received? */
1018                         if (temp & PORT_RESUME) {
1019                                 /* resume signaling for 20 msec */
1020                                 ehci->reset_done[wIndex] = jiffies
1021                                                 + msecs_to_jiffies(20);
1022                                 usb_hcd_start_port_resume(&hcd->self, wIndex);
1023                                 set_bit(wIndex, &ehci->resuming_ports);
1024                                 /* check the port again */
1025                                 mod_timer(&ehci_to_hcd(ehci)->rh_timer,
1026                                                 ehci->reset_done[wIndex]);
1027                         }
1028
1029                 /* reset or resume not yet complete */
1030                 } else if (!time_after_eq(jiffies, ehci->reset_done[wIndex])) {
1031                         ;       /* wait until it is complete */
1032
1033                 /* resume completed */
1034                 } else if (test_bit(wIndex, &ehci->resuming_ports)) {
1035                         clear_bit(wIndex, &ehci->suspended_ports);
1036                         set_bit(wIndex, &ehci->port_c_suspend);
1037                         ehci->reset_done[wIndex] = 0;
1038                         usb_hcd_end_port_resume(&hcd->self, wIndex);
1039
1040                         /* stop resume signaling */
1041                         temp &= ~(PORT_RWC_BITS | PORT_SUSPEND | PORT_RESUME);
1042                         ehci_writel(ehci, temp, status_reg);
1043                         clear_bit(wIndex, &ehci->resuming_ports);
1044                         retval = ehci_handshake(ehci, status_reg,
1045                                         PORT_RESUME, 0, 2000 /* 2msec */);
1046                         if (retval != 0) {
1047                                 ehci_err(ehci, "port %d resume error %d\n",
1048                                                 wIndex + 1, retval);
1049                                 goto error;
1050                         }
1051                         temp = ehci_readl(ehci, status_reg);
1052
1053                 /* whoever resets must GetPortStatus to complete it!! */
1054                 } else {
1055                         status |= USB_PORT_STAT_C_RESET << 16;
1056                         ehci->reset_done [wIndex] = 0;
1057
1058                         /* force reset to complete */
1059                         ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESET),
1060                                         status_reg);
1061                         /* REVISIT:  some hardware needs 550+ usec to clear
1062                          * this bit; seems too long to spin routinely...
1063                          */
1064                         retval = ehci_handshake(ehci, status_reg,
1065                                         PORT_RESET, 0, 1000);
1066                         if (retval != 0) {
1067                                 ehci_err (ehci, "port %d reset error %d\n",
1068                                         wIndex + 1, retval);
1069                                 goto error;
1070                         }
1071
1072                         /* see what we found out */
1073                         temp = check_reset_complete (ehci, wIndex, status_reg,
1074                                         ehci_readl(ehci, status_reg));
1075                 }
1076
1077                 /* transfer dedicated ports to the companion hc */
1078                 if ((temp & PORT_CONNECT) &&
1079                                 test_bit(wIndex, &ehci->companion_ports)) {
1080                         temp &= ~PORT_RWC_BITS;
1081                         temp |= PORT_OWNER;
1082                         ehci_writel(ehci, temp, status_reg);
1083                         ehci_dbg(ehci, "port %d --> companion\n", wIndex + 1);
1084                         temp = ehci_readl(ehci, status_reg);
1085                 }
1086
1087                 /*
1088                  * Even if OWNER is set, there's no harm letting khubd
1089                  * see the wPortStatus values (they should all be 0 except
1090                  * for PORT_POWER anyway).
1091                  */
1092
1093                 if (temp & PORT_CONNECT) {
1094                         status |= USB_PORT_STAT_CONNECTION;
1095                         // status may be from integrated TT
1096                         if (ehci->has_hostpc) {
1097                                 temp1 = ehci_readl(ehci, hostpc_reg);
1098                                 status |= ehci_port_speed(ehci, temp1);
1099                         } else
1100                                 status |= ehci_port_speed(ehci, temp);
1101                 }
1102                 if (temp & PORT_PE)
1103                         status |= USB_PORT_STAT_ENABLE;
1104
1105                 /* maybe the port was unsuspended without our knowledge */
1106                 if (temp & (PORT_SUSPEND|PORT_RESUME)) {
1107                         status |= USB_PORT_STAT_SUSPEND;
1108                 } else if (test_bit(wIndex, &ehci->suspended_ports)) {
1109                         clear_bit(wIndex, &ehci->suspended_ports);
1110                         clear_bit(wIndex, &ehci->resuming_ports);
1111                         ehci->reset_done[wIndex] = 0;
1112                         if (temp & PORT_PE)
1113                                 set_bit(wIndex, &ehci->port_c_suspend);
1114                         usb_hcd_end_port_resume(&hcd->self, wIndex);
1115                 }
1116
1117                 if (temp & PORT_OC)
1118                         status |= USB_PORT_STAT_OVERCURRENT;
1119                 if (temp & PORT_RESET)
1120                         status |= USB_PORT_STAT_RESET;
1121                 if (temp & PORT_POWER)
1122                         status |= USB_PORT_STAT_POWER;
1123                 if (test_bit(wIndex, &ehci->port_c_suspend))
1124                         status |= USB_PORT_STAT_C_SUSPEND << 16;
1125
1126                 if (status & ~0xffff)   /* only if wPortChange is interesting */
1127                         dbg_port(ehci, "GetStatus", wIndex + 1, temp);
1128                 put_unaligned_le32(status, buf);
1129                 break;
1130         case SetHubFeature:
1131                 switch (wValue) {
1132                 case C_HUB_LOCAL_POWER:
1133                 case C_HUB_OVER_CURRENT:
1134                         /* no hub-wide feature/status flags */
1135                         break;
1136                 default:
1137                         goto error;
1138                 }
1139                 break;
1140         case SetPortFeature:
1141                 selector = wIndex >> 8;
1142                 wIndex &= 0xff;
1143                 if (unlikely(ehci->debug)) {
1144                         /* If the debug port is active any port
1145                          * feature requests should get denied */
1146                         if (wIndex == HCS_DEBUG_PORT(ehci->hcs_params) &&
1147                             (readl(&ehci->debug->control) & DBGP_ENABLED)) {
1148                                 retval = -ENODEV;
1149                                 goto error_exit;
1150                         }
1151                 }
1152                 if (!wIndex || wIndex > ports)
1153                         goto error;
1154                 wIndex--;
1155                 temp = ehci_readl(ehci, status_reg);
1156                 if (temp & PORT_OWNER)
1157                         break;
1158
1159                 temp &= ~PORT_RWC_BITS;
1160                 switch (wValue) {
1161                 case USB_PORT_FEAT_SUSPEND:
1162                         if (ehci->no_selective_suspend)
1163                                 break;
1164                         if ((temp & PORT_PE) == 0
1165                                         || (temp & PORT_RESET) != 0)
1166                                 goto error;
1167
1168                         /* After above check the port must be connected.
1169                          * Set appropriate bit thus could put phy into low power
1170                          * mode if we have tdi_phy_lpm feature
1171                          */
1172                         temp &= ~PORT_WKCONN_E;
1173                         temp |= PORT_WKDISC_E | PORT_WKOC_E;
1174                         ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
1175                         if (ehci->has_tdi_phy_lpm) {
1176                                 spin_unlock_irqrestore(&ehci->lock, flags);
1177                                 msleep(5);/* 5ms for HCD enter low pwr mode */
1178                                 spin_lock_irqsave(&ehci->lock, flags);
1179                                 temp1 = ehci_readl(ehci, hostpc_reg);
1180                                 ehci_writel(ehci, temp1 | HOSTPC_PHCD,
1181                                         hostpc_reg);
1182                                 temp1 = ehci_readl(ehci, hostpc_reg);
1183                                 ehci_dbg(ehci, "Port%d phy low pwr mode %s\n",
1184                                         wIndex, (temp1 & HOSTPC_PHCD) ?
1185                                         "succeeded" : "failed");
1186                         }
1187                         set_bit(wIndex, &ehci->suspended_ports);
1188                         break;
1189                 case USB_PORT_FEAT_POWER:
1190                         if (HCS_PPC (ehci->hcs_params))
1191                                 ehci_writel(ehci, temp | PORT_POWER,
1192                                                 status_reg);
1193                         break;
1194                 case USB_PORT_FEAT_RESET:
1195                         if (temp & (PORT_SUSPEND|PORT_RESUME))
1196                                 goto error;
1197                         /* line status bits may report this as low speed,
1198                          * which can be fine if this root hub has a
1199                          * transaction translator built in.
1200                          */
1201                         if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
1202                                         && !ehci_is_TDI(ehci)
1203                                         && PORT_USB11 (temp)) {
1204                                 ehci_dbg (ehci,
1205                                         "port %d low speed --> companion\n",
1206                                         wIndex + 1);
1207                                 temp |= PORT_OWNER;
1208                         } else {
1209                                 temp |= PORT_RESET;
1210                                 temp &= ~PORT_PE;
1211
1212                                 /*
1213                                  * caller must wait, then call GetPortStatus
1214                                  * usb 2.0 spec says 50 ms resets on root
1215                                  */
1216                                 ehci->reset_done [wIndex] = jiffies
1217                                                 + msecs_to_jiffies (50);
1218                         }
1219                         ehci_writel(ehci, temp, status_reg);
1220                         break;
1221
1222                 /* For downstream facing ports (these):  one hub port is put
1223                  * into test mode according to USB2 11.24.2.13, then the hub
1224                  * must be reset (which for root hub now means rmmod+modprobe,
1225                  * or else system reboot).  See EHCI 2.3.9 and 4.14 for info
1226                  * about the EHCI-specific stuff.
1227                  */
1228                 case USB_PORT_FEAT_TEST:
1229 #ifdef CONFIG_USB_HCD_TEST_MODE
1230                         if (selector == EHSET_TEST_SINGLE_STEP_SET_FEATURE) {
1231                                 spin_unlock_irqrestore(&ehci->lock, flags);
1232                                 retval = ehset_single_step_set_feature(hcd,
1233                                                                         wIndex);
1234                                 spin_lock_irqsave(&ehci->lock, flags);
1235                                 break;
1236                         }
1237 #endif
1238                         if (!selector || selector > 5)
1239                                 goto error;
1240                         spin_unlock_irqrestore(&ehci->lock, flags);
1241                         ehci_quiesce(ehci);
1242                         spin_lock_irqsave(&ehci->lock, flags);
1243
1244                         /* Put all enabled ports into suspend */
1245                         while (ports--) {
1246                                 u32 __iomem *sreg =
1247                                                 &ehci->regs->port_status[ports];
1248
1249                                 temp = ehci_readl(ehci, sreg) & ~PORT_RWC_BITS;
1250                                 if (temp & PORT_PE)
1251                                         ehci_writel(ehci, temp | PORT_SUSPEND,
1252                                                         sreg);
1253                         }
1254
1255                         spin_unlock_irqrestore(&ehci->lock, flags);
1256                         ehci_halt(ehci);
1257                         spin_lock_irqsave(&ehci->lock, flags);
1258
1259                         temp = ehci_readl(ehci, status_reg);
1260                         temp |= selector << 16;
1261                         ehci_writel(ehci, temp, status_reg);
1262                         break;
1263
1264                 default:
1265                         goto error;
1266                 }
1267                 ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
1268                 break;
1269
1270         default:
1271 error:
1272                 /* "stall" on error */
1273                 retval = -EPIPE;
1274         }
1275 error_exit:
1276         spin_unlock_irqrestore (&ehci->lock, flags);
1277         return retval;
1278 }
1279 EXPORT_SYMBOL_GPL(ehci_hub_control);
1280
1281 static void ehci_relinquish_port(struct usb_hcd *hcd, int portnum)
1282 {
1283         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1284
1285         if (ehci_is_TDI(ehci))
1286                 return;
1287         set_owner(ehci, --portnum, PORT_OWNER);
1288 }
1289
1290 static int ehci_port_handed_over(struct usb_hcd *hcd, int portnum)
1291 {
1292         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1293         u32 __iomem             *reg;
1294
1295         if (ehci_is_TDI(ehci))
1296                 return 0;
1297         reg = &ehci->regs->port_status[portnum - 1];
1298         return ehci_readl(ehci, reg) & PORT_OWNER;
1299 }