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_vdbg(ehci, "port %d, %08x -> %08x\n",
 215                                 port + 1, t1, t2);
 216                 ehci_writel(ehci, t2, reg);
 217         }
 218
 219         /* enter phy low-power mode again */
 220         if (ehci->has_tdi_phy_lpm) {
 221                 port = HCS_N_PORTS(ehci->hcs_params);
 222                 while (port--) {
 223                         u32 __iomem     *hostpc_reg = &ehci->regs->hostpc[port];
 224
 225                         temp = ehci_readl(ehci, hostpc_reg);
 226                         ehci_writel(ehci, temp | HOSTPC_PHCD, hostpc_reg);
 227                 }
 228         }
 229
 230         /* Does the root hub have a port wakeup pending? */
 231         if (!suspending && ehci_port_change(ehci))
 232                 usb_hcd_resume_root_hub(ehci_to_hcd(ehci));
 233
 234         spin_unlock_irq(&ehci->lock);
 235 }
 236
 237 static int ehci_bus_suspend (struct usb_hcd *hcd)
 238 {
 239         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 240         int                     port;
 241         int                     mask;
 242         int                     changed;
 243
 244         ehci_dbg(ehci, "suspend root hub\n");
 245
 246         if (time_before (jiffies, ehci->next_statechange))
 247                 msleep(5);
 248
 249         /* stop the schedules */
 250         ehci_quiesce(ehci);
 251
 252         spin_lock_irq (&ehci->lock);
 253         if (ehci->rh_state < EHCI_RH_RUNNING)
 254                 goto done;
 255
 256         /* Once the controller is stopped, port resumes that are already
 257          * in progress won't complete.  Hence if remote wakeup is enabled
 258          * for the root hub and any ports are in the middle of a resume or
 259          * remote wakeup, we must fail the suspend.
 260          */
 261         if (hcd->self.root_hub->do_remote_wakeup) {
 262                 if (ehci->resuming_ports) {
 263                         spin_unlock_irq(&ehci->lock);
 264                         ehci_dbg(ehci, "suspend failed because a port is resuming\n");
 265                         return -EBUSY;
 266                 }
 267         }
 268
 269         /* Unlike other USB host controller types, EHCI doesn't have
 270          * any notion of "global" or bus-wide suspend.  The driver has
 271          * to manually suspend all the active unsuspended ports, and
 272          * then manually resume them in the bus_resume() routine.
 273          */
 274         ehci->bus_suspended = 0;
 275         ehci->owned_ports = 0;
 276         changed = 0;
 277         port = HCS_N_PORTS(ehci->hcs_params);
 278         while (port--) {
 279                 u32 __iomem     *reg = &ehci->regs->port_status [port];
 280                 u32             t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
 281                 u32             t2 = t1 & ~PORT_WAKE_BITS;
 282
 283                 /* keep track of which ports we suspend */
 284                 if (t1 & PORT_OWNER)
 285                         set_bit(port, &ehci->owned_ports);
 286                 else if ((t1 & PORT_PE) && !(t1 & PORT_SUSPEND)) {
 287                         t2 |= PORT_SUSPEND;
 288                         set_bit(port, &ehci->bus_suspended);
 289                 }
 290
 291                 /* enable remote wakeup on all ports, if told to do so */
 292                 if (hcd->self.root_hub->do_remote_wakeup) {
 293                         /* only enable appropriate wake bits, otherwise the
 294                          * hardware can not go phy low power mode. If a race
 295                          * condition happens here(connection change during bits
 296                          * set), the port change detection will finally fix it.
 297                          */
 298                         if (t1 & PORT_CONNECT)
 299                                 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
 300                         else
 301                                 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
 302                 }
 303
 304                 if (t1 != t2) {
 305                         ehci_vdbg (ehci, "port %d, %08x -> %08x\n",
 306                                 port + 1, t1, t2);
 307                         ehci_writel(ehci, t2, reg);
 308                         changed = 1;
 309                 }
 310         }
 311
 312         if (changed && ehci->has_tdi_phy_lpm) {
 313                 spin_unlock_irq(&ehci->lock);
 314                 msleep(5);      /* 5 ms for HCD to enter low-power mode */
 315                 spin_lock_irq(&ehci->lock);
 316
 317                 port = HCS_N_PORTS(ehci->hcs_params);
 318                 while (port--) {
 319                         u32 __iomem     *hostpc_reg = &ehci->regs->hostpc[port];
 320                         u32             t3;
 321
 322                         t3 = ehci_readl(ehci, hostpc_reg);
 323                         ehci_writel(ehci, t3 | HOSTPC_PHCD, hostpc_reg);
 324                         t3 = ehci_readl(ehci, hostpc_reg);
 325                         ehci_dbg(ehci, "Port %d phy low-power mode %s\n",
 326                                         port, (t3 & HOSTPC_PHCD) ?
 327                                         "succeeded" : "failed");
 328                 }
 329         }
 330         spin_unlock_irq(&ehci->lock);
 331
 332         /* Apparently some devices need a >= 1-uframe delay here */
 333         if (ehci->bus_suspended)
 334                 udelay(150);
 335
 336         /* turn off now-idle HC */
 337         ehci_halt (ehci);
 338
 339         spin_lock_irq(&ehci->lock);
 340         if (ehci->enabled_hrtimer_events & BIT(EHCI_HRTIMER_POLL_DEAD))
 341                 ehci_handle_controller_death(ehci);
 342         if (ehci->rh_state != EHCI_RH_RUNNING)
 343                 goto done;
 344         ehci->rh_state = EHCI_RH_SUSPENDED;
 345
 346         end_unlink_async(ehci);
 347         unlink_empty_async_suspended(ehci);
 348         ehci_handle_start_intr_unlinks(ehci);
 349         ehci_handle_intr_unlinks(ehci);
 350         end_free_itds(ehci);
 351
 352         /* allow remote wakeup */
 353         mask = INTR_MASK;
 354         if (!hcd->self.root_hub->do_remote_wakeup)
 355                 mask &= ~STS_PCD;
 356         ehci_writel(ehci, mask, &ehci->regs->intr_enable);
 357         ehci_readl(ehci, &ehci->regs->intr_enable);
 358
 359  done:
 360         ehci->next_statechange = jiffies + msecs_to_jiffies(10);
 361         ehci->enabled_hrtimer_events = 0;
 362         ehci->next_hrtimer_event = EHCI_HRTIMER_NO_EVENT;
 363         spin_unlock_irq (&ehci->lock);
 364
 365         hrtimer_cancel(&ehci->hrtimer);
 366         return 0;
 367 }
 368
 369
 370 /* caller has locked the root hub, and should reset/reinit on error */
 371 static int ehci_bus_resume (struct usb_hcd *hcd)
 372 {
 373         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 374         u32                     temp;
 375         u32                     power_okay;
 376         int                     i;
 377         unsigned long           resume_needed = 0;
 378
 379         if (time_before (jiffies, ehci->next_statechange))
 380                 msleep(5);
 381         spin_lock_irq (&ehci->lock);
 382         if (!HCD_HW_ACCESSIBLE(hcd) || ehci->shutdown)
 383                 goto shutdown;
 384
 385         if (unlikely(ehci->debug)) {
 386                 if (!dbgp_reset_prep(hcd))
 387                         ehci->debug = NULL;
 388                 else
 389                         dbgp_external_startup(hcd);
 390         }
 391
 392         /* Ideally and we've got a real resume here, and no port's power
 393          * was lost.  (For PCI, that means Vaux was maintained.)  But we
 394          * could instead be restoring a swsusp snapshot -- so that BIOS was
 395          * the last user of the controller, not reset/pm hardware keeping
 396          * state we gave to it.
 397          */
 398         power_okay = ehci_readl(ehci, &ehci->regs->intr_enable);
 399         ehci_dbg(ehci, "resume root hub%s\n",
 400                         power_okay ? "" : " after power loss");
 401
 402         /* at least some APM implementations will try to deliver
 403          * IRQs right away, so delay them until we're ready.
 404          */
 405         ehci_writel(ehci, 0, &ehci->regs->intr_enable);
 406
 407         /* re-init operational registers */
 408         ehci_writel(ehci, 0, &ehci->regs->segment);
 409         ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
 410         ehci_writel(ehci, (u32) ehci->async->qh_dma, &ehci->regs->async_next);
 411
 412         /* restore CMD_RUN, framelist size, and irq threshold */
 413         ehci->command |= CMD_RUN;
 414         ehci_writel(ehci, ehci->command, &ehci->regs->command);
 415         ehci->rh_state = EHCI_RH_RUNNING;
 416
 417         /*
 418          * According to Bugzilla #8190, the port status for some controllers
 419          * will be wrong without a delay. At their wrong status, the port
 420          * is enabled, but not suspended neither resumed.
 421          */
 422         i = HCS_N_PORTS(ehci->hcs_params);
 423         while (i--) {
 424                 temp = ehci_readl(ehci, &ehci->regs->port_status[i]);
 425                 if ((temp & PORT_PE) &&
 426                                 !(temp & (PORT_SUSPEND | PORT_RESUME))) {
 427                         ehci_dbg(ehci, "Port status(0x%x) is wrong\n", temp);
 428                         spin_unlock_irq(&ehci->lock);
 429                         msleep(8);
 430                         spin_lock_irq(&ehci->lock);
 431                         break;
 432                 }
 433         }
 434
 435         if (ehci->shutdown)
 436                 goto shutdown;
 437
 438         /* clear phy low-power mode before resume */
 439         if (ehci->bus_suspended && ehci->has_tdi_phy_lpm) {
 440                 i = HCS_N_PORTS(ehci->hcs_params);
 441                 while (i--) {
 442                         if (test_bit(i, &ehci->bus_suspended)) {
 443                                 u32 __iomem     *hostpc_reg =
 444                                                         &ehci->regs->hostpc[i];
 445
 446                                 temp = ehci_readl(ehci, hostpc_reg);
 447                                 ehci_writel(ehci, temp & ~HOSTPC_PHCD,
 448                                                 hostpc_reg);
 449                         }
 450                 }
 451                 spin_unlock_irq(&ehci->lock);
 452                 msleep(5);
 453                 spin_lock_irq(&ehci->lock);
 454                 if (ehci->shutdown)
 455                         goto shutdown;
 456         }
 457
 458         /* manually resume the ports we suspended during bus_suspend() */
 459         i = HCS_N_PORTS (ehci->hcs_params);
 460         while (i--) {
 461                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 462                 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
 463                 if (test_bit(i, &ehci->bus_suspended) &&
 464                                 (temp & PORT_SUSPEND)) {
 465                         temp |= PORT_RESUME;
 466                         set_bit(i, &resume_needed);
 467                 }
 468                 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
 469         }
 470
 471         /* msleep for 20ms only if code is trying to resume port */
 472         if (resume_needed) {
 473                 spin_unlock_irq(&ehci->lock);
 474                 msleep(20);
 475                 spin_lock_irq(&ehci->lock);
 476                 if (ehci->shutdown)
 477                         goto shutdown;
 478         }
 479
 480         i = HCS_N_PORTS (ehci->hcs_params);
 481         while (i--) {
 482                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 483                 if (test_bit(i, &resume_needed)) {
 484                         temp &= ~(PORT_RWC_BITS | PORT_SUSPEND | PORT_RESUME);
 485                         ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
 486                         ehci_vdbg (ehci, "resumed port %d\n", i + 1);
 487                 }
 488         }
 489
 490         ehci->next_statechange = jiffies + msecs_to_jiffies(5);
 491         spin_unlock_irq(&ehci->lock);
 492
 493         ehci_handover_companion_ports(ehci);
 494
 495         /* Now we can safely re-enable irqs */
 496         spin_lock_irq(&ehci->lock);
 497         if (ehci->shutdown)
 498                 goto shutdown;
 499         ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
 500         (void) ehci_readl(ehci, &ehci->regs->intr_enable);
 501         spin_unlock_irq(&ehci->lock);
 502
 503         return 0;
 504
 505  shutdown:
 506         spin_unlock_irq(&ehci->lock);
 507         return -ESHUTDOWN;
 508 }
 509
 510 #else
 511
 512 #define ehci_bus_suspend        NULL
 513 #define ehci_bus_resume         NULL
 514
 515 #endif  /* CONFIG_PM */
 516
 517 /*-------------------------------------------------------------------------*/
 518
 519 /*
 520  * Sets the owner of a port
 521  */
 522 static void set_owner(struct ehci_hcd *ehci, int portnum, int new_owner)
 523 {
 524         u32 __iomem             *status_reg;
 525         u32                     port_status;
 526         int                     try;
 527
 528         status_reg = &ehci->regs->port_status[portnum];
 529
 530         /*
 531          * The controller won't set the OWNER bit if the port is
 532          * enabled, so this loop will sometimes require at least two
 533          * iterations: one to disable the port and one to set OWNER.
 534          */
 535         for (try = 4; try > 0; --try) {
 536                 spin_lock_irq(&ehci->lock);
 537                 port_status = ehci_readl(ehci, status_reg);
 538                 if ((port_status & PORT_OWNER) == new_owner
 539                                 || (port_status & (PORT_OWNER | PORT_CONNECT))
 540                                         == 0)
 541                         try = 0;
 542                 else {
 543                         port_status ^= PORT_OWNER;
 544                         port_status &= ~(PORT_PE | PORT_RWC_BITS);
 545                         ehci_writel(ehci, port_status, status_reg);
 546                 }
 547                 spin_unlock_irq(&ehci->lock);
 548                 if (try > 1)
 549                         msleep(5);
 550         }
 551 }
 552
 553 /*-------------------------------------------------------------------------*/
 554
 555 static int check_reset_complete (
 556         struct ehci_hcd *ehci,
 557         int             index,
 558         u32 __iomem     *status_reg,
 559         int             port_status
 560 ) {
 561         if (!(port_status & PORT_CONNECT))
 562                 return port_status;
 563
 564         /* if reset finished and it's still not enabled -- handoff */
 565         if (!(port_status & PORT_PE)) {
 566
 567                 /* with integrated TT, there's nobody to hand it to! */
 568                 if (ehci_is_TDI(ehci)) {
 569                         ehci_dbg (ehci,
 570                                 "Failed to enable port %d on root hub TT\n",
 571                                 index+1);
 572                         return port_status;
 573                 }
 574
 575                 ehci_dbg (ehci, "port %d full speed --> companion\n",
 576                         index + 1);
 577
 578                 // what happens if HCS_N_CC(params) == 0 ?
 579                 port_status |= PORT_OWNER;
 580                 port_status &= ~PORT_RWC_BITS;
 581                 ehci_writel(ehci, port_status, status_reg);
 582
 583                 /* ensure 440EPX ohci controller state is operational */
 584                 if (ehci->has_amcc_usb23)
 585                         set_ohci_hcfs(ehci, 1);
 586         } else {
 587                 ehci_dbg(ehci, "port %d reset complete, port enabled\n",
 588                         index + 1);
 589                 /* ensure 440EPx ohci controller state is suspended */
 590                 if (ehci->has_amcc_usb23)
 591                         set_ohci_hcfs(ehci, 0);
 592         }
 593
 594         return port_status;
 595 }
 596
 597 /*-------------------------------------------------------------------------*/
 598
 599
 600 /* build "status change" packet (one or two bytes) from HC registers */
 601
 602 static int
 603 ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
 604 {
 605         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 606         u32             temp, status;
 607         u32             mask;
 608         int             ports, i, retval = 1;
 609         unsigned long   flags;
 610         u32             ppcd = ~0;
 611
 612         /* init status to no-changes */
 613         buf [0] = 0;
 614         ports = HCS_N_PORTS (ehci->hcs_params);
 615         if (ports > 7) {
 616                 buf [1] = 0;
 617                 retval++;
 618         }
 619
 620         /* Inform the core about resumes-in-progress by returning
 621          * a non-zero value even if there are no status changes.
 622          */
 623         status = ehci->resuming_ports;
 624
 625         /* Some boards (mostly VIA?) report bogus overcurrent indications,
 626          * causing massive log spam unless we completely ignore them.  It
 627          * may be relevant that VIA VT8235 controllers, where PORT_POWER is
 628          * always set, seem to clear PORT_OCC and PORT_CSC when writing to
 629          * PORT_POWER; that's surprising, but maybe within-spec.
 630          */
 631         if (!ignore_oc)
 632                 mask = PORT_CSC | PORT_PEC | PORT_OCC;
 633         else
 634                 mask = PORT_CSC | PORT_PEC;
 635         // PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
 636
 637         /* no hub change reports (bit 0) for now (power, ...) */
 638
 639         /* port N changes (bit N)? */
 640         spin_lock_irqsave (&ehci->lock, flags);
 641
 642         /* get per-port change detect bits */
 643         if (ehci->has_ppcd)
 644                 ppcd = ehci_readl(ehci, &ehci->regs->status) >> 16;
 645
 646         for (i = 0; i < ports; i++) {
 647                 /* leverage per-port change bits feature */
 648                 if (ppcd & (1 << i))
 649                         temp = ehci_readl(ehci, &ehci->regs->port_status[i]);
 650                 else
 651                         temp = 0;
 652
 653                 /*
 654                  * Return status information even for ports with OWNER set.
 655                  * Otherwise khubd wouldn't see the disconnect event when a
 656                  * high-speed device is switched over to the companion
 657                  * controller by the user.
 658                  */
 659
 660                 if ((temp & mask) != 0 || test_bit(i, &ehci->port_c_suspend)
 661                                 || (ehci->reset_done[i] && time_after_eq(
 662                                         jiffies, ehci->reset_done[i]))) {
 663                         if (i < 7)
 664                             buf [0] |= 1 << (i + 1);
 665                         else
 666                             buf [1] |= 1 << (i - 7);
 667                         status = STS_PCD;
 668                 }
 669         }
 670
 671         /* If a resume is in progress, make sure it can finish */
 672         if (ehci->resuming_ports)
 673                 mod_timer(&hcd->rh_timer, jiffies + msecs_to_jiffies(25));
 674
 675         spin_unlock_irqrestore (&ehci->lock, flags);
 676         return status ? retval : 0;
 677 }
 678
 679 /*-------------------------------------------------------------------------*/
 680
 681 static void
 682 ehci_hub_descriptor (
 683         struct ehci_hcd                 *ehci,
 684         struct usb_hub_descriptor       *desc
 685 ) {
 686         int             ports = HCS_N_PORTS (ehci->hcs_params);
 687         u16             temp;
 688
 689         desc->bDescriptorType = 0x29;
 690         desc->bPwrOn2PwrGood = 10;      /* ehci 1.0, 2.3.9 says 20ms max */
 691         desc->bHubContrCurrent = 0;
 692
 693         desc->bNbrPorts = ports;
 694         temp = 1 + (ports / 8);
 695         desc->bDescLength = 7 + 2 * temp;
 696
 697         /* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
 698         memset(&desc->u.hs.DeviceRemovable[0], 0, temp);
 699         memset(&desc->u.hs.DeviceRemovable[temp], 0xff, temp);
 700
 701         temp = 0x0008;                  /* per-port overcurrent reporting */
 702         if (HCS_PPC (ehci->hcs_params))
 703                 temp |= 0x0001;         /* per-port power control */
 704         else
 705                 temp |= 0x0002;         /* no power switching */
 706 #if 0
 707 // re-enable when we support USB_PORT_FEAT_INDICATOR below.
 708         if (HCS_INDICATOR (ehci->hcs_params))
 709                 temp |= 0x0080;         /* per-port indicators (LEDs) */
 710 #endif
 711         desc->wHubCharacteristics = cpu_to_le16(temp);
 712 }
 713
 714 /*-------------------------------------------------------------------------*/
 715 #define EHSET_TEST_SINGLE_STEP_SET_FEATURE 0x06
 716
 717 static void usb_ehset_completion(struct urb *urb)
 718 {
 719         struct completion  *done = urb->context;
 720
 721         complete(done);
 722 }
 723 static int submit_single_step_set_feature(
 724         struct usb_hcd  *hcd,
 725         struct urb      *urb,
 726         int             is_setup
 727 );
 728
 729 /*
 730  * Allocate and initialize a control URB. This request will be used by the
 731  * EHSET SINGLE_STEP_SET_FEATURE test in which the DATA and STATUS stages
 732  * of the GetDescriptor request are sent 15 seconds after the SETUP stage.
 733  * Return NULL if failed.
 734  */
 735 static struct urb *request_single_step_set_feature_urb(
 736         struct usb_device       *udev,
 737         void                    *dr,
 738         void                    *buf,
 739         struct completion       *done
 740 ) {
 741         struct urb *urb;
 742         struct usb_hcd *hcd = bus_to_hcd(udev->bus);
 743         struct usb_host_endpoint *ep;
 744
 745         urb = usb_alloc_urb(0, GFP_KERNEL);
 746         if (!urb)
 747                 return NULL;
 748
 749         urb->pipe = usb_rcvctrlpipe(udev, 0);
 750         ep = (usb_pipein(urb->pipe) ? udev->ep_in : udev->ep_out)
 751                                 [usb_pipeendpoint(urb->pipe)];
 752         if (!ep) {
 753                 usb_free_urb(urb);
 754                 return NULL;
 755         }
 756
 757         urb->ep = ep;
 758         urb->dev = udev;
 759         urb->setup_packet = (void *)dr;
 760         urb->transfer_buffer = buf;
 761         urb->transfer_buffer_length = USB_DT_DEVICE_SIZE;
 762         urb->complete = usb_ehset_completion;
 763         urb->status = -EINPROGRESS;
 764         urb->actual_length = 0;
 765         urb->transfer_flags = URB_DIR_IN;
 766         usb_get_urb(urb);
 767         atomic_inc(&urb->use_count);
 768         atomic_inc(&urb->dev->urbnum);
 769         urb->setup_dma = dma_map_single(
 770                         hcd->self.controller,
 771                         urb->setup_packet,
 772                         sizeof(struct usb_ctrlrequest),
 773                         DMA_TO_DEVICE);
 774         urb->transfer_dma = dma_map_single(
 775                         hcd->self.controller,
 776                         urb->transfer_buffer,
 777                         urb->transfer_buffer_length,
 778                         DMA_FROM_DEVICE);
 779         urb->context = done;
 780         return urb;
 781 }
 782
 783 static int ehset_single_step_set_feature(struct usb_hcd *hcd, int port)
 784 {
 785         int retval = -ENOMEM;
 786         struct usb_ctrlrequest *dr;
 787         struct urb *urb;
 788         struct usb_device *udev;
 789         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 790         struct usb_device_descriptor *buf;
 791         DECLARE_COMPLETION_ONSTACK(done);
 792
 793         /* Obtain udev of the rhub's child port */
 794         udev = usb_hub_find_child(hcd->self.root_hub, port);
 795         if (!udev) {
 796                 ehci_err(ehci, "No device attached to the RootHub\n");
 797                 return -ENODEV;
 798         }
 799         buf = kmalloc(USB_DT_DEVICE_SIZE, GFP_KERNEL);
 800         if (!buf)
 801                 return -ENOMEM;
 802
 803         dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
 804         if (!dr) {
 805                 kfree(buf);
 806                 return -ENOMEM;
 807         }
 808
 809         /* Fill Setup packet for GetDescriptor */
 810         dr->bRequestType = USB_DIR_IN;
 811         dr->bRequest = USB_REQ_GET_DESCRIPTOR;
 812         dr->wValue = cpu_to_le16(USB_DT_DEVICE << 8);
 813         dr->wIndex = 0;
 814         dr->wLength = cpu_to_le16(USB_DT_DEVICE_SIZE);
 815         urb = request_single_step_set_feature_urb(udev, dr, buf, &done);
 816         if (!urb)
 817                 goto cleanup;
 818
 819         /* Submit just the SETUP stage */
 820         retval = submit_single_step_set_feature(hcd, urb, 1);
 821         if (retval)
 822                 goto out1;
 823         if (!wait_for_completion_timeout(&done, msecs_to_jiffies(2000))) {
 824                 usb_kill_urb(urb);
 825                 retval = -ETIMEDOUT;
 826                 ehci_err(ehci, "%s SETUP stage timed out on ep0\n", __func__);
 827                 goto out1;
 828         }
 829         msleep(15 * 1000);
 830
 831         /* Complete remaining DATA and STATUS stages using the same URB */
 832         urb->status = -EINPROGRESS;
 833         usb_get_urb(urb);
 834         atomic_inc(&urb->use_count);
 835         atomic_inc(&urb->dev->urbnum);
 836         retval = submit_single_step_set_feature(hcd, urb, 0);
 837         if (!retval && !wait_for_completion_timeout(&done,
 838                                                 msecs_to_jiffies(2000))) {
 839                 usb_kill_urb(urb);
 840                 retval = -ETIMEDOUT;
 841                 ehci_err(ehci, "%s IN stage timed out on ep0\n", __func__);
 842         }
 843 out1:
 844         usb_free_urb(urb);
 845 cleanup:
 846         kfree(dr);
 847         kfree(buf);
 848         return retval;
 849 }
 850 /*-------------------------------------------------------------------------*/
 851
 852 static int ehci_hub_control (
 853         struct usb_hcd  *hcd,
 854         u16             typeReq,
 855         u16             wValue,
 856         u16             wIndex,
 857         char            *buf,
 858         u16             wLength
 859 ) {
 860         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 861         int             ports = HCS_N_PORTS (ehci->hcs_params);
 862         u32 __iomem     *status_reg = &ehci->regs->port_status[
 863                                 (wIndex & 0xff) - 1];
 864         u32 __iomem     *hostpc_reg = &ehci->regs->hostpc[(wIndex & 0xff) - 1];
 865         u32             temp, temp1, status;
 866         unsigned long   flags;
 867         int             retval = 0;
 868         unsigned        selector;
 869
 870         /*
 871          * FIXME:  support SetPortFeatures USB_PORT_FEAT_INDICATOR.
 872          * HCS_INDICATOR may say we can change LEDs to off/amber/green.
 873          * (track current state ourselves) ... blink for diagnostics,
 874          * power, "this is the one", etc.  EHCI spec supports this.
 875          */
 876
 877         spin_lock_irqsave (&ehci->lock, flags);
 878         switch (typeReq) {
 879         case ClearHubFeature:
 880                 switch (wValue) {
 881                 case C_HUB_LOCAL_POWER:
 882                 case C_HUB_OVER_CURRENT:
 883                         /* no hub-wide feature/status flags */
 884                         break;
 885                 default:
 886                         goto error;
 887                 }
 888                 break;
 889         case ClearPortFeature:
 890                 if (!wIndex || wIndex > ports)
 891                         goto error;
 892                 wIndex--;
 893                 temp = ehci_readl(ehci, status_reg);
 894                 temp &= ~PORT_RWC_BITS;
 895
 896                 /*
 897                  * Even if OWNER is set, so the port is owned by the
 898                  * companion controller, khubd needs to be able to clear
 899                  * the port-change status bits (especially
 900                  * USB_PORT_STAT_C_CONNECTION).
 901                  */
 902
 903                 switch (wValue) {
 904                 case USB_PORT_FEAT_ENABLE:
 905                         ehci_writel(ehci, temp & ~PORT_PE, status_reg);
 906                         break;
 907                 case USB_PORT_FEAT_C_ENABLE:
 908                         ehci_writel(ehci, temp | PORT_PEC, status_reg);
 909                         break;
 910                 case USB_PORT_FEAT_SUSPEND:
 911                         if (temp & PORT_RESET)
 912                                 goto error;
 913                         if (ehci->no_selective_suspend)
 914                                 break;
 915 #ifdef CONFIG_USB_OTG
 916                         if ((hcd->self.otg_port == (wIndex + 1))
 917                             && hcd->self.b_hnp_enable) {
 918                                 otg_start_hnp(hcd->phy->otg);
 919                                 break;
 920                         }
 921 #endif
 922                         if (!(temp & PORT_SUSPEND))
 923                                 break;
 924                         if ((temp & PORT_PE) == 0)
 925                                 goto error;
 926
 927                         /* clear phy low-power mode before resume */
 928                         if (ehci->has_tdi_phy_lpm) {
 929                                 temp1 = ehci_readl(ehci, hostpc_reg);
 930                                 ehci_writel(ehci, temp1 & ~HOSTPC_PHCD,
 931                                                 hostpc_reg);
 932                                 spin_unlock_irqrestore(&ehci->lock, flags);
 933                                 msleep(5);/* wait to leave low-power mode */
 934                                 spin_lock_irqsave(&ehci->lock, flags);
 935                         }
 936                         /* resume signaling for 20 msec */
 937                         temp &= ~PORT_WAKE_BITS;
 938                         ehci_writel(ehci, temp | PORT_RESUME, status_reg);
 939                         ehci->reset_done[wIndex] = jiffies
 940                                         + msecs_to_jiffies(20);
 941                         set_bit(wIndex, &ehci->resuming_ports);
 942                         usb_hcd_start_port_resume(&hcd->self, wIndex);
 943                         break;
 944                 case USB_PORT_FEAT_C_SUSPEND:
 945                         clear_bit(wIndex, &ehci->port_c_suspend);
 946                         break;
 947                 case USB_PORT_FEAT_POWER:
 948                         if (HCS_PPC (ehci->hcs_params))
 949                                 ehci_writel(ehci, temp & ~PORT_POWER,
 950                                                 status_reg);
 951                         break;
 952                 case USB_PORT_FEAT_C_CONNECTION:
 953                         ehci_writel(ehci, temp | PORT_CSC, status_reg);
 954                         break;
 955                 case USB_PORT_FEAT_C_OVER_CURRENT:
 956                         ehci_writel(ehci, temp | PORT_OCC, status_reg);
 957                         break;
 958                 case USB_PORT_FEAT_C_RESET:
 959                         /* GetPortStatus clears reset */
 960                         break;
 961                 default:
 962                         goto error;
 963                 }
 964                 ehci_readl(ehci, &ehci->regs->command); /* unblock posted write */
 965                 break;
 966         case GetHubDescriptor:
 967                 ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
 968                         buf);
 969                 break;
 970         case GetHubStatus:
 971                 /* no hub-wide feature/status flags */
 972                 memset (buf, 0, 4);
 973                 //cpu_to_le32s ((u32 *) buf);
 974                 break;
 975         case GetPortStatus:
 976                 if (!wIndex || wIndex > ports)
 977                         goto error;
 978                 wIndex--;
 979                 status = 0;
 980                 temp = ehci_readl(ehci, status_reg);
 981
 982                 // wPortChange bits
 983                 if (temp & PORT_CSC)
 984                         status |= USB_PORT_STAT_C_CONNECTION << 16;
 985                 if (temp & PORT_PEC)
 986                         status |= USB_PORT_STAT_C_ENABLE << 16;
 987
 988                 if ((temp & PORT_OCC) && !ignore_oc){
 989                         status |= USB_PORT_STAT_C_OVERCURRENT << 16;
 990
 991                         /*
 992                          * Hubs should disable port power on over-current.
 993                          * However, not all EHCI implementations do this
 994                          * automatically, even if they _do_ support per-port
 995                          * power switching; they're allowed to just limit the
 996                          * current.  khubd will turn the power back on.
 997                          */
 998                         if (((temp & PORT_OC) || (ehci->need_oc_pp_cycle))
 999                                         && HCS_PPC(ehci->hcs_params)) {
1000                                 ehci_writel(ehci,
1001                                         temp & ~(PORT_RWC_BITS | PORT_POWER),
1002                                         status_reg);
1003                                 temp = ehci_readl(ehci, status_reg);
1004                         }
1005                 }
1006
1007                 /* no reset or resume pending */
1008                 if (!ehci->reset_done[wIndex]) {
1009
1010                         /* Remote Wakeup received? */
1011                         if (temp & PORT_RESUME) {
1012                                 /* resume signaling for 20 msec */
1013                                 ehci->reset_done[wIndex] = jiffies
1014                                                 + msecs_to_jiffies(20);
1015                                 usb_hcd_start_port_resume(&hcd->self, wIndex);
1016                                 set_bit(wIndex, &ehci->resuming_ports);
1017                                 /* check the port again */
1018                                 mod_timer(&ehci_to_hcd(ehci)->rh_timer,
1019                                                 ehci->reset_done[wIndex]);
1020                         }
1021
1022                 /* reset or resume not yet complete */
1023                 } else if (!time_after_eq(jiffies, ehci->reset_done[wIndex])) {
1024                         ;       /* wait until it is complete */
1025
1026                 /* resume completed */
1027                 } else if (test_bit(wIndex, &ehci->resuming_ports)) {
1028                         clear_bit(wIndex, &ehci->suspended_ports);
1029                         set_bit(wIndex, &ehci->port_c_suspend);
1030                         ehci->reset_done[wIndex] = 0;
1031                         usb_hcd_end_port_resume(&hcd->self, wIndex);
1032
1033                         /* stop resume signaling */
1034                         temp &= ~(PORT_RWC_BITS | PORT_SUSPEND | PORT_RESUME);
1035                         ehci_writel(ehci, temp, status_reg);
1036                         clear_bit(wIndex, &ehci->resuming_ports);
1037                         retval = ehci_handshake(ehci, status_reg,
1038                                         PORT_RESUME, 0, 2000 /* 2msec */);
1039                         if (retval != 0) {
1040                                 ehci_err(ehci, "port %d resume error %d\n",
1041                                                 wIndex + 1, retval);
1042                                 goto error;
1043                         }
1044                         temp = ehci_readl(ehci, status_reg);
1045
1046                 /* whoever resets must GetPortStatus to complete it!! */
1047                 } else {
1048                         status |= USB_PORT_STAT_C_RESET << 16;
1049                         ehci->reset_done [wIndex] = 0;
1050
1051                         /* force reset to complete */
1052                         ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESET),
1053                                         status_reg);
1054                         /* REVISIT:  some hardware needs 550+ usec to clear
1055                          * this bit; seems too long to spin routinely...
1056                          */
1057                         retval = ehci_handshake(ehci, status_reg,
1058                                         PORT_RESET, 0, 1000);
1059                         if (retval != 0) {
1060                                 ehci_err (ehci, "port %d reset error %d\n",
1061                                         wIndex + 1, retval);
1062                                 goto error;
1063                         }
1064
1065                         /* see what we found out */
1066                         temp = check_reset_complete (ehci, wIndex, status_reg,
1067                                         ehci_readl(ehci, status_reg));
1068                 }
1069
1070                 /* transfer dedicated ports to the companion hc */
1071                 if ((temp & PORT_CONNECT) &&
1072                                 test_bit(wIndex, &ehci->companion_ports)) {
1073                         temp &= ~PORT_RWC_BITS;
1074                         temp |= PORT_OWNER;
1075                         ehci_writel(ehci, temp, status_reg);
1076                         ehci_dbg(ehci, "port %d --> companion\n", wIndex + 1);
1077                         temp = ehci_readl(ehci, status_reg);
1078                 }
1079
1080                 /*
1081                  * Even if OWNER is set, there's no harm letting khubd
1082                  * see the wPortStatus values (they should all be 0 except
1083                  * for PORT_POWER anyway).
1084                  */
1085
1086                 if (temp & PORT_CONNECT) {
1087                         status |= USB_PORT_STAT_CONNECTION;
1088                         // status may be from integrated TT
1089                         if (ehci->has_hostpc) {
1090                                 temp1 = ehci_readl(ehci, hostpc_reg);
1091                                 status |= ehci_port_speed(ehci, temp1);
1092                         } else
1093                                 status |= ehci_port_speed(ehci, temp);
1094                 }
1095                 if (temp & PORT_PE)
1096                         status |= USB_PORT_STAT_ENABLE;
1097
1098                 /* maybe the port was unsuspended without our knowledge */
1099                 if (temp & (PORT_SUSPEND|PORT_RESUME)) {
1100                         status |= USB_PORT_STAT_SUSPEND;
1101                 } else if (test_bit(wIndex, &ehci->suspended_ports)) {
1102                         clear_bit(wIndex, &ehci->suspended_ports);
1103                         clear_bit(wIndex, &ehci->resuming_ports);
1104                         ehci->reset_done[wIndex] = 0;
1105                         if (temp & PORT_PE)
1106                                 set_bit(wIndex, &ehci->port_c_suspend);
1107                         usb_hcd_end_port_resume(&hcd->self, wIndex);
1108                 }
1109
1110                 if (temp & PORT_OC)
1111                         status |= USB_PORT_STAT_OVERCURRENT;
1112                 if (temp & PORT_RESET)
1113                         status |= USB_PORT_STAT_RESET;
1114                 if (temp & PORT_POWER)
1115                         status |= USB_PORT_STAT_POWER;
1116                 if (test_bit(wIndex, &ehci->port_c_suspend))
1117                         status |= USB_PORT_STAT_C_SUSPEND << 16;
1118
1119 #ifndef VERBOSE_DEBUG
1120         if (status & ~0xffff)   /* only if wPortChange is interesting */
1121 #endif
1122                 dbg_port (ehci, "GetStatus", wIndex + 1, temp);
1123                 put_unaligned_le32(status, buf);
1124                 break;
1125         case SetHubFeature:
1126                 switch (wValue) {
1127                 case C_HUB_LOCAL_POWER:
1128                 case C_HUB_OVER_CURRENT:
1129                         /* no hub-wide feature/status flags */
1130                         break;
1131                 default:
1132                         goto error;
1133                 }
1134                 break;
1135         case SetPortFeature:
1136                 selector = wIndex >> 8;
1137                 wIndex &= 0xff;
1138                 if (unlikely(ehci->debug)) {
1139                         /* If the debug port is active any port
1140                          * feature requests should get denied */
1141                         if (wIndex == HCS_DEBUG_PORT(ehci->hcs_params) &&
1142                             (readl(&ehci->debug->control) & DBGP_ENABLED)) {
1143                                 retval = -ENODEV;
1144                                 goto error_exit;
1145                         }
1146                 }
1147                 if (!wIndex || wIndex > ports)
1148                         goto error;
1149                 wIndex--;
1150                 temp = ehci_readl(ehci, status_reg);
1151                 if (temp & PORT_OWNER)
1152                         break;
1153
1154                 temp &= ~PORT_RWC_BITS;
1155                 switch (wValue) {
1156                 case USB_PORT_FEAT_SUSPEND:
1157                         if (ehci->no_selective_suspend)
1158                                 break;
1159                         if ((temp & PORT_PE) == 0
1160                                         || (temp & PORT_RESET) != 0)
1161                                 goto error;
1162
1163                         /* After above check the port must be connected.
1164                          * Set appropriate bit thus could put phy into low power
1165                          * mode if we have tdi_phy_lpm feature
1166                          */
1167                         temp &= ~PORT_WKCONN_E;
1168                         temp |= PORT_WKDISC_E | PORT_WKOC_E;
1169                         ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
1170                         if (ehci->has_tdi_phy_lpm) {
1171                                 spin_unlock_irqrestore(&ehci->lock, flags);
1172                                 msleep(5);/* 5ms for HCD enter low pwr mode */
1173                                 spin_lock_irqsave(&ehci->lock, flags);
1174                                 temp1 = ehci_readl(ehci, hostpc_reg);
1175                                 ehci_writel(ehci, temp1 | HOSTPC_PHCD,
1176                                         hostpc_reg);
1177                                 temp1 = ehci_readl(ehci, hostpc_reg);
1178                                 ehci_dbg(ehci, "Port%d phy low pwr mode %s\n",
1179                                         wIndex, (temp1 & HOSTPC_PHCD) ?
1180                                         "succeeded" : "failed");
1181                         }
1182                         set_bit(wIndex, &ehci->suspended_ports);
1183                         break;
1184                 case USB_PORT_FEAT_POWER:
1185                         if (HCS_PPC (ehci->hcs_params))
1186                                 ehci_writel(ehci, temp | PORT_POWER,
1187                                                 status_reg);
1188                         break;
1189                 case USB_PORT_FEAT_RESET:
1190                         if (temp & (PORT_SUSPEND|PORT_RESUME))
1191                                 goto error;
1192                         /* line status bits may report this as low speed,
1193                          * which can be fine if this root hub has a
1194                          * transaction translator built in.
1195                          */
1196                         if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
1197                                         && !ehci_is_TDI(ehci)
1198                                         && PORT_USB11 (temp)) {
1199                                 ehci_dbg (ehci,
1200                                         "port %d low speed --> companion\n",
1201                                         wIndex + 1);
1202                                 temp |= PORT_OWNER;
1203                         } else {
1204                                 ehci_vdbg (ehci, "port %d reset\n", wIndex + 1);
1205                                 temp |= PORT_RESET;
1206                                 temp &= ~PORT_PE;
1207
1208                                 /*
1209                                  * caller must wait, then call GetPortStatus
1210                                  * usb 2.0 spec says 50 ms resets on root
1211                                  */
1212                                 ehci->reset_done [wIndex] = jiffies
1213                                                 + msecs_to_jiffies (50);
1214                         }
1215                         ehci_writel(ehci, temp, status_reg);
1216                         break;
1217
1218                 /* For downstream facing ports (these):  one hub port is put
1219                  * into test mode according to USB2 11.24.2.13, then the hub
1220                  * must be reset (which for root hub now means rmmod+modprobe,
1221                  * or else system reboot).  See EHCI 2.3.9 and 4.14 for info
1222                  * about the EHCI-specific stuff.
1223                  */
1224                 case USB_PORT_FEAT_TEST:
1225                         if (selector == EHSET_TEST_SINGLE_STEP_SET_FEATURE) {
1226                                 spin_unlock_irqrestore(&ehci->lock, flags);
1227                                 retval = ehset_single_step_set_feature(hcd,
1228                                                                         wIndex);
1229                                 spin_lock_irqsave(&ehci->lock, flags);
1230                                 break;
1231                         } else if (!selector || selector > 5)
1232                                 goto error;
1233                         spin_unlock_irqrestore(&ehci->lock, flags);
1234                         ehci_quiesce(ehci);
1235                         spin_lock_irqsave(&ehci->lock, flags);
1236
1237                         /* Put all enabled ports into suspend */
1238                         while (ports--) {
1239                                 u32 __iomem *sreg =
1240                                                 &ehci->regs->port_status[ports];
1241
1242                                 temp = ehci_readl(ehci, sreg) & ~PORT_RWC_BITS;
1243                                 if (temp & PORT_PE)
1244                                         ehci_writel(ehci, temp | PORT_SUSPEND,
1245                                                         sreg);
1246                         }
1247
1248                         spin_unlock_irqrestore(&ehci->lock, flags);
1249                         ehci_halt(ehci);
1250                         spin_lock_irqsave(&ehci->lock, flags);
1251
1252                         temp = ehci_readl(ehci, status_reg);
1253                         temp |= selector << 16;
1254                         ehci_writel(ehci, temp, status_reg);
1255                         break;
1256
1257                 default:
1258                         goto error;
1259                 }
1260                 ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
1261                 break;
1262
1263         default:
1264 error:
1265                 /* "stall" on error */
1266                 retval = -EPIPE;
1267         }
1268 error_exit:
1269         spin_unlock_irqrestore (&ehci->lock, flags);
1270         return retval;
1271 }
1272
1273 static void ehci_relinquish_port(struct usb_hcd *hcd, int portnum)
1274 {
1275         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1276
1277         if (ehci_is_TDI(ehci))
1278                 return;
1279         set_owner(ehci, --portnum, PORT_OWNER);
1280 }
1281
1282 static int ehci_port_handed_over(struct usb_hcd *hcd, int portnum)
1283 {
1284         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1285         u32 __iomem             *reg;
1286
1287         if (ehci_is_TDI(ehci))
1288                 return 0;
1289         reg = &ehci->regs->port_status[portnum - 1];
1290         return ehci_readl(ehci, reg) & PORT_OWNER;
1291 }