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                                 ehci_port_power(ehci, port, true);
  74                 }
  75         }
  76
  77         /* Give the connections some time to appear */
  78         msleep(20);
  79
  80         spin_lock_irq(&ehci->lock);
  81         port = HCS_N_PORTS(ehci->hcs_params);
  82         while (port--) {
  83                 if (test_bit(port, &ehci->owned_ports)) {
  84                         reg = &ehci->regs->port_status[port];
  85                         status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
  86
  87                         /* Port already owned by companion? */
  88                         if (status & PORT_OWNER)
  89                                 clear_bit(port, &ehci->owned_ports);
  90                         else if (test_bit(port, &ehci->companion_ports))
  91                                 ehci_writel(ehci, status & ~PORT_PE, reg);
  92                         else {
  93                                 spin_unlock_irq(&ehci->lock);
  94                                 ehci_hub_control(hcd, SetPortFeature,
  95                                                 USB_PORT_FEAT_RESET, port + 1,
  96                                                 NULL, 0);
  97                                 spin_lock_irq(&ehci->lock);
  98                         }
  99                 }
 100         }
 101         spin_unlock_irq(&ehci->lock);
 102
 103         if (!ehci->owned_ports)
 104                 return;
 105         msleep(90);             /* Wait for resets to complete */
 106
 107         spin_lock_irq(&ehci->lock);
 108         port = HCS_N_PORTS(ehci->hcs_params);
 109         while (port--) {
 110                 if (test_bit(port, &ehci->owned_ports)) {
 111                         spin_unlock_irq(&ehci->lock);
 112                         ehci_hub_control(hcd, GetPortStatus,
 113                                         0, port + 1,
 114                                         (char *) &buf, sizeof(buf));
 115                         spin_lock_irq(&ehci->lock);
 116
 117                         /* The companion should now own the port,
 118                          * but if something went wrong the port must not
 119                          * remain enabled.
 120                          */
 121                         reg = &ehci->regs->port_status[port];
 122                         status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
 123                         if (status & PORT_OWNER)
 124                                 ehci_writel(ehci, status | PORT_CSC, reg);
 125                         else {
 126                                 ehci_dbg(ehci, "failed handover port %d: %x\n",
 127                                                 port + 1, status);
 128                                 ehci_writel(ehci, status & ~PORT_PE, reg);
 129                         }
 130                 }
 131         }
 132
 133         ehci->owned_ports = 0;
 134         spin_unlock_irq(&ehci->lock);
 135 }
 136
 137 static int ehci_port_change(struct ehci_hcd *ehci)
 138 {
 139         int i = HCS_N_PORTS(ehci->hcs_params);
 140
 141         /* First check if the controller indicates a change event */
 142
 143         if (ehci_readl(ehci, &ehci->regs->status) & STS_PCD)
 144                 return 1;
 145
 146         /*
 147          * Not all controllers appear to update this while going from D3 to D0,
 148          * so check the individual port status registers as well
 149          */
 150
 151         while (i--)
 152                 if (ehci_readl(ehci, &ehci->regs->port_status[i]) & PORT_CSC)
 153                         return 1;
 154
 155         return 0;
 156 }
 157
 158 static void ehci_adjust_port_wakeup_flags(struct ehci_hcd *ehci,
 159                 bool suspending, bool do_wakeup)
 160 {
 161         int             port;
 162         u32             temp;
 163
 164         /* If remote wakeup is enabled for the root hub but disabled
 165          * for the controller, we must adjust all the port wakeup flags
 166          * when the controller is suspended or resumed.  In all other
 167          * cases they don't need to be changed.
 168          */
 169         if (!ehci_to_hcd(ehci)->self.root_hub->do_remote_wakeup || do_wakeup)
 170                 return;
 171
 172         spin_lock_irq(&ehci->lock);
 173
 174         /* clear phy low-power mode before changing wakeup flags */
 175         if (ehci->has_tdi_phy_lpm) {
 176                 port = HCS_N_PORTS(ehci->hcs_params);
 177                 while (port--) {
 178                         u32 __iomem     *hostpc_reg = &ehci->regs->hostpc[port];
 179
 180                         temp = ehci_readl(ehci, hostpc_reg);
 181                         ehci_writel(ehci, temp & ~HOSTPC_PHCD, hostpc_reg);
 182                 }
 183                 spin_unlock_irq(&ehci->lock);
 184                 msleep(5);
 185                 spin_lock_irq(&ehci->lock);
 186         }
 187
 188         port = HCS_N_PORTS(ehci->hcs_params);
 189         while (port--) {
 190                 u32 __iomem     *reg = &ehci->regs->port_status[port];
 191                 u32             t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
 192                 u32             t2 = t1 & ~PORT_WAKE_BITS;
 193
 194                 /* If we are suspending the controller, clear the flags.
 195                  * If we are resuming the controller, set the wakeup flags.
 196                  */
 197                 if (!suspending) {
 198                         if (t1 & PORT_CONNECT)
 199                                 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
 200                         else
 201                                 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
 202                 }
 203                 ehci_writel(ehci, t2, reg);
 204         }
 205
 206         /* enter phy low-power mode again */
 207         if (ehci->has_tdi_phy_lpm) {
 208                 port = HCS_N_PORTS(ehci->hcs_params);
 209                 while (port--) {
 210                         u32 __iomem     *hostpc_reg = &ehci->regs->hostpc[port];
 211
 212                         temp = ehci_readl(ehci, hostpc_reg);
 213                         ehci_writel(ehci, temp | HOSTPC_PHCD, hostpc_reg);
 214                 }
 215         }
 216
 217         /* Does the root hub have a port wakeup pending? */
 218         if (!suspending && ehci_port_change(ehci))
 219                 usb_hcd_resume_root_hub(ehci_to_hcd(ehci));
 220
 221         spin_unlock_irq(&ehci->lock);
 222 }
 223
 224 static int ehci_bus_suspend (struct usb_hcd *hcd)
 225 {
 226         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 227         int                     port;
 228         int                     mask;
 229         int                     changed;
 230         bool                    fs_idle_delay;
 231
 232         ehci_dbg(ehci, "suspend root hub\n");
 233
 234         if (time_before (jiffies, ehci->next_statechange))
 235                 msleep(5);
 236
 237         /* stop the schedules */
 238         ehci_quiesce(ehci);
 239
 240         spin_lock_irq (&ehci->lock);
 241         if (ehci->rh_state < EHCI_RH_RUNNING)
 242                 goto done;
 243
 244         /* Once the controller is stopped, port resumes that are already
 245          * in progress won't complete.  Hence if remote wakeup is enabled
 246          * for the root hub and any ports are in the middle of a resume or
 247          * remote wakeup, we must fail the suspend.
 248          */
 249         if (hcd->self.root_hub->do_remote_wakeup) {
 250                 if (ehci->resuming_ports) {
 251                         spin_unlock_irq(&ehci->lock);
 252                         ehci_dbg(ehci, "suspend failed because a port is resuming\n");
 253                         return -EBUSY;
 254                 }
 255         }
 256
 257         /* Unlike other USB host controller types, EHCI doesn't have
 258          * any notion of "global" or bus-wide suspend.  The driver has
 259          * to manually suspend all the active unsuspended ports, and
 260          * then manually resume them in the bus_resume() routine.
 261          */
 262         ehci->bus_suspended = 0;
 263         ehci->owned_ports = 0;
 264         changed = 0;
 265         fs_idle_delay = false;
 266         port = HCS_N_PORTS(ehci->hcs_params);
 267         while (port--) {
 268                 u32 __iomem     *reg = &ehci->regs->port_status [port];
 269                 u32             t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
 270                 u32             t2 = t1 & ~PORT_WAKE_BITS;
 271
 272                 /* keep track of which ports we suspend */
 273                 if (t1 & PORT_OWNER)
 274                         set_bit(port, &ehci->owned_ports);
 275                 else if ((t1 & PORT_PE) && !(t1 & PORT_SUSPEND)) {
 276                         t2 |= PORT_SUSPEND;
 277                         set_bit(port, &ehci->bus_suspended);
 278                 }
 279
 280                 /* enable remote wakeup on all ports, if told to do so */
 281                 if (hcd->self.root_hub->do_remote_wakeup) {
 282                         /* only enable appropriate wake bits, otherwise the
 283                          * hardware can not go phy low power mode. If a race
 284                          * condition happens here(connection change during bits
 285                          * set), the port change detection will finally fix it.
 286                          */
 287                         if (t1 & PORT_CONNECT)
 288                                 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
 289                         else
 290                                 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
 291                 }
 292
 293                 if (t1 != t2) {
 294                         /*
 295                          * On some controllers, Wake-On-Disconnect will
 296                          * generate false wakeup signals until the bus
 297                          * switches over to full-speed idle.  For their
 298                          * sake, add a delay if we need one.
 299                          */
 300                         if ((t2 & PORT_WKDISC_E) &&
 301                                         ehci_port_speed(ehci, t2) ==
 302                                                 USB_PORT_STAT_HIGH_SPEED)
 303                                 fs_idle_delay = true;
 304                         ehci_writel(ehci, t2, reg);
 305                         changed = 1;
 306                 }
 307         }
 308         spin_unlock_irq(&ehci->lock);
 309
 310         if ((changed && ehci->has_tdi_phy_lpm) || fs_idle_delay) {
 311                 /*
 312                  * Wait for HCD to enter low-power mode or for the bus
 313                  * to switch to full-speed idle.
 314                  */
 315                 usleep_range(5000, 5500);
 316         }
 317
 318         if (changed && ehci->has_tdi_phy_lpm) {
 319                 spin_lock_irq(&ehci->lock);
 320                 port = HCS_N_PORTS(ehci->hcs_params);
 321                 while (port--) {
 322                         u32 __iomem     *hostpc_reg = &ehci->regs->hostpc[port];
 323                         u32             t3;
 324
 325                         t3 = ehci_readl(ehci, hostpc_reg);
 326                         ehci_writel(ehci, t3 | HOSTPC_PHCD, hostpc_reg);
 327                         t3 = ehci_readl(ehci, hostpc_reg);
 328                         ehci_dbg(ehci, "Port %d phy low-power mode %s\n",
 329                                         port, (t3 & HOSTPC_PHCD) ?
 330                                         "succeeded" : "failed");
 331                 }
 332                 spin_unlock_irq(&ehci->lock);
 333         }
 334
 335         /* Apparently some devices need a >= 1-uframe delay here */
 336         if (ehci->bus_suspended)
 337                 udelay(150);
 338
 339         /* turn off now-idle HC */
 340         ehci_halt (ehci);
 341
 342         spin_lock_irq(&ehci->lock);
 343         if (ehci->enabled_hrtimer_events & BIT(EHCI_HRTIMER_POLL_DEAD))
 344                 ehci_handle_controller_death(ehci);
 345         if (ehci->rh_state != EHCI_RH_RUNNING)
 346                 goto done;
 347         ehci->rh_state = EHCI_RH_SUSPENDED;
 348
 349         end_unlink_async(ehci);
 350         unlink_empty_async_suspended(ehci);
 351         ehci_handle_start_intr_unlinks(ehci);
 352         ehci_handle_intr_unlinks(ehci);
 353         end_free_itds(ehci);
 354
 355         /* allow remote wakeup */
 356         mask = INTR_MASK;
 357         if (!hcd->self.root_hub->do_remote_wakeup)
 358                 mask &= ~STS_PCD;
 359         ehci_writel(ehci, mask, &ehci->regs->intr_enable);
 360         ehci_readl(ehci, &ehci->regs->intr_enable);
 361
 362  done:
 363         ehci->next_statechange = jiffies + msecs_to_jiffies(10);
 364         ehci->enabled_hrtimer_events = 0;
 365         ehci->next_hrtimer_event = EHCI_HRTIMER_NO_EVENT;
 366         spin_unlock_irq (&ehci->lock);
 367
 368         hrtimer_cancel(&ehci->hrtimer);
 369         return 0;
 370 }
 371
 372
 373 /* caller has locked the root hub, and should reset/reinit on error */
 374 static int ehci_bus_resume (struct usb_hcd *hcd)
 375 {
 376         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 377         u32                     temp;
 378         u32                     power_okay;
 379         int                     i;
 380         unsigned long           resume_needed = 0;
 381
 382         if (time_before (jiffies, ehci->next_statechange))
 383                 msleep(5);
 384         spin_lock_irq (&ehci->lock);
 385         if (!HCD_HW_ACCESSIBLE(hcd) || ehci->shutdown)
 386                 goto shutdown;
 387
 388         if (unlikely(ehci->debug)) {
 389                 if (!dbgp_reset_prep(hcd))
 390                         ehci->debug = NULL;
 391                 else
 392                         dbgp_external_startup(hcd);
 393         }
 394
 395         /* Ideally and we've got a real resume here, and no port's power
 396          * was lost.  (For PCI, that means Vaux was maintained.)  But we
 397          * could instead be restoring a swsusp snapshot -- so that BIOS was
 398          * the last user of the controller, not reset/pm hardware keeping
 399          * state we gave to it.
 400          */
 401         power_okay = ehci_readl(ehci, &ehci->regs->intr_enable);
 402         ehci_dbg(ehci, "resume root hub%s\n",
 403                         power_okay ? "" : " after power loss");
 404
 405         /* at least some APM implementations will try to deliver
 406          * IRQs right away, so delay them until we're ready.
 407          */
 408         ehci_writel(ehci, 0, &ehci->regs->intr_enable);
 409
 410         /* re-init operational registers */
 411         ehci_writel(ehci, 0, &ehci->regs->segment);
 412         ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
 413         ehci_writel(ehci, (u32) ehci->async->qh_dma, &ehci->regs->async_next);
 414
 415         /* restore CMD_RUN, framelist size, and irq threshold */
 416         ehci->command |= CMD_RUN;
 417         ehci_writel(ehci, ehci->command, &ehci->regs->command);
 418         ehci->rh_state = EHCI_RH_RUNNING;
 419
 420         /*
 421          * According to Bugzilla #8190, the port status for some controllers
 422          * will be wrong without a delay. At their wrong status, the port
 423          * is enabled, but not suspended neither resumed.
 424          */
 425         i = HCS_N_PORTS(ehci->hcs_params);
 426         while (i--) {
 427                 temp = ehci_readl(ehci, &ehci->regs->port_status[i]);
 428                 if ((temp & PORT_PE) &&
 429                                 !(temp & (PORT_SUSPEND | PORT_RESUME))) {
 430                         ehci_dbg(ehci, "Port status(0x%x) is wrong\n", temp);
 431                         spin_unlock_irq(&ehci->lock);
 432                         msleep(8);
 433                         spin_lock_irq(&ehci->lock);
 434                         break;
 435                 }
 436         }
 437
 438         if (ehci->shutdown)
 439                 goto shutdown;
 440
 441         /* clear phy low-power mode before resume */
 442         if (ehci->bus_suspended && ehci->has_tdi_phy_lpm) {
 443                 i = HCS_N_PORTS(ehci->hcs_params);
 444                 while (i--) {
 445                         if (test_bit(i, &ehci->bus_suspended)) {
 446                                 u32 __iomem     *hostpc_reg =
 447                                                         &ehci->regs->hostpc[i];
 448
 449                                 temp = ehci_readl(ehci, hostpc_reg);
 450                                 ehci_writel(ehci, temp & ~HOSTPC_PHCD,
 451                                                 hostpc_reg);
 452                         }
 453                 }
 454                 spin_unlock_irq(&ehci->lock);
 455                 msleep(5);
 456                 spin_lock_irq(&ehci->lock);
 457                 if (ehci->shutdown)
 458                         goto shutdown;
 459         }
 460
 461         /* manually resume the ports we suspended during bus_suspend() */
 462         i = HCS_N_PORTS (ehci->hcs_params);
 463         while (i--) {
 464                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 465                 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
 466                 if (test_bit(i, &ehci->bus_suspended) &&
 467                                 (temp & PORT_SUSPEND)) {
 468                         temp |= PORT_RESUME;
 469                         set_bit(i, &resume_needed);
 470                 }
 471                 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
 472         }
 473
 474         /* msleep for 20ms only if code is trying to resume port */
 475         if (resume_needed) {
 476                 spin_unlock_irq(&ehci->lock);
 477                 msleep(20);
 478                 spin_lock_irq(&ehci->lock);
 479                 if (ehci->shutdown)
 480                         goto shutdown;
 481         }
 482
 483         i = HCS_N_PORTS (ehci->hcs_params);
 484         while (i--) {
 485                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 486                 if (test_bit(i, &resume_needed)) {
 487                         temp &= ~(PORT_RWC_BITS | PORT_SUSPEND | PORT_RESUME);
 488                         ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
 489                 }
 490         }
 491
 492         ehci->next_statechange = jiffies + msecs_to_jiffies(5);
 493         spin_unlock_irq(&ehci->lock);
 494
 495         ehci_handover_companion_ports(ehci);
 496
 497         /* Now we can safely re-enable irqs */
 498         spin_lock_irq(&ehci->lock);
 499         if (ehci->shutdown)
 500                 goto shutdown;
 501         ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
 502         (void) ehci_readl(ehci, &ehci->regs->intr_enable);
 503         spin_unlock_irq(&ehci->lock);
 504
 505         return 0;
 506
 507  shutdown:
 508         spin_unlock_irq(&ehci->lock);
 509         return -ESHUTDOWN;
 510 }
 511
 512 #else
 513
 514 #define ehci_bus_suspend        NULL
 515 #define ehci_bus_resume         NULL
 516
 517 #endif  /* CONFIG_PM */
 518
 519 /*-------------------------------------------------------------------------*/
 520
 521 /*
 522  * Sets the owner of a port
 523  */
 524 static void set_owner(struct ehci_hcd *ehci, int portnum, int new_owner)
 525 {
 526         u32 __iomem             *status_reg;
 527         u32                     port_status;
 528         int                     try;
 529
 530         status_reg = &ehci->regs->port_status[portnum];
 531
 532         /*
 533          * The controller won't set the OWNER bit if the port is
 534          * enabled, so this loop will sometimes require at least two
 535          * iterations: one to disable the port and one to set OWNER.
 536          */
 537         for (try = 4; try > 0; --try) {
 538                 spin_lock_irq(&ehci->lock);
 539                 port_status = ehci_readl(ehci, status_reg);
 540                 if ((port_status & PORT_OWNER) == new_owner
 541                                 || (port_status & (PORT_OWNER | PORT_CONNECT))
 542                                         == 0)
 543                         try = 0;
 544                 else {
 545                         port_status ^= PORT_OWNER;
 546                         port_status &= ~(PORT_PE | PORT_RWC_BITS);
 547                         ehci_writel(ehci, port_status, status_reg);
 548                 }
 549                 spin_unlock_irq(&ehci->lock);
 550                 if (try > 1)
 551                         msleep(5);
 552         }
 553 }
 554
 555 /*-------------------------------------------------------------------------*/
 556
 557 static int check_reset_complete (
 558         struct ehci_hcd *ehci,
 559         int             index,
 560         u32 __iomem     *status_reg,
 561         int             port_status
 562 ) {
 563         if (!(port_status & PORT_CONNECT))
 564                 return port_status;
 565
 566         /* if reset finished and it's still not enabled -- handoff */
 567         if (!(port_status & PORT_PE)) {
 568
 569                 /* with integrated TT, there's nobody to hand it to! */
 570                 if (ehci_is_TDI(ehci)) {
 571                         ehci_dbg (ehci,
 572                                 "Failed to enable port %d on root hub TT\n",
 573                                 index+1);
 574                         return port_status;
 575                 }
 576
 577                 ehci_dbg (ehci, "port %d full speed --> companion\n",
 578                         index + 1);
 579
 580                 // what happens if HCS_N_CC(params) == 0 ?
 581                 port_status |= PORT_OWNER;
 582                 port_status &= ~PORT_RWC_BITS;
 583                 ehci_writel(ehci, port_status, status_reg);
 584
 585                 /* ensure 440EPX ohci controller state is operational */
 586                 if (ehci->has_amcc_usb23)
 587                         set_ohci_hcfs(ehci, 1);
 588         } else {
 589                 ehci_dbg(ehci, "port %d reset complete, port enabled\n",
 590                         index + 1);
 591                 /* ensure 440EPx ohci controller state is suspended */
 592                 if (ehci->has_amcc_usb23)
 593                         set_ohci_hcfs(ehci, 0);
 594         }
 595
 596         return port_status;
 597 }
 598
 599 /*-------------------------------------------------------------------------*/
 600
 601
 602 /* build "status change" packet (one or two bytes) from HC registers */
 603
 604 static int
 605 ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
 606 {
 607         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 608         u32             temp, status;
 609         u32             mask;
 610         int             ports, i, retval = 1;
 611         unsigned long   flags;
 612         u32             ppcd = ~0;
 613
 614         /* init status to no-changes */
 615         buf [0] = 0;
 616         ports = HCS_N_PORTS (ehci->hcs_params);
 617         if (ports > 7) {
 618                 buf [1] = 0;
 619                 retval++;
 620         }
 621
 622         /* Inform the core about resumes-in-progress by returning
 623          * a non-zero value even if there are no status changes.
 624          */
 625         status = ehci->resuming_ports;
 626
 627         /* Some boards (mostly VIA?) report bogus overcurrent indications,
 628          * causing massive log spam unless we completely ignore them.  It
 629          * may be relevant that VIA VT8235 controllers, where PORT_POWER is
 630          * always set, seem to clear PORT_OCC and PORT_CSC when writing to
 631          * PORT_POWER; that's surprising, but maybe within-spec.
 632          */
 633         if (!ignore_oc)
 634                 mask = PORT_CSC | PORT_PEC | PORT_OCC;
 635         else
 636                 mask = PORT_CSC | PORT_PEC;
 637         // PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
 638
 639         /* no hub change reports (bit 0) for now (power, ...) */
 640
 641         /* port N changes (bit N)? */
 642         spin_lock_irqsave (&ehci->lock, flags);
 643
 644         /* get per-port change detect bits */
 645         if (ehci->has_ppcd)
 646                 ppcd = ehci_readl(ehci, &ehci->regs->status) >> 16;
 647
 648         for (i = 0; i < ports; i++) {
 649                 /* leverage per-port change bits feature */
 650                 if (ppcd & (1 << i))
 651                         temp = ehci_readl(ehci, &ehci->regs->port_status[i]);
 652                 else
 653                         temp = 0;
 654
 655                 /*
 656                  * Return status information even for ports with OWNER set.
 657                  * Otherwise hub_wq wouldn't see the disconnect event when a
 658                  * high-speed device is switched over to the companion
 659                  * controller by the user.
 660                  */
 661
 662                 if ((temp & mask) != 0 || test_bit(i, &ehci->port_c_suspend)
 663                                 || (ehci->reset_done[i] && time_after_eq(
 664                                         jiffies, ehci->reset_done[i]))) {
 665                         if (i < 7)
 666                             buf [0] |= 1 << (i + 1);
 667                         else
 668                             buf [1] |= 1 << (i - 7);
 669                         status = STS_PCD;
 670                 }
 671         }
 672
 673         /* If a resume is in progress, make sure it can finish */
 674         if (ehci->resuming_ports)
 675                 mod_timer(&hcd->rh_timer, jiffies + msecs_to_jiffies(25));
 676
 677         spin_unlock_irqrestore (&ehci->lock, flags);
 678         return status ? retval : 0;
 679 }
 680
 681 /*-------------------------------------------------------------------------*/
 682
 683 static void
 684 ehci_hub_descriptor (
 685         struct ehci_hcd                 *ehci,
 686         struct usb_hub_descriptor       *desc
 687 ) {
 688         int             ports = HCS_N_PORTS (ehci->hcs_params);
 689         u16             temp;
 690
 691         desc->bDescriptorType = 0x29;
 692         desc->bPwrOn2PwrGood = 10;      /* ehci 1.0, 2.3.9 says 20ms max */
 693         desc->bHubContrCurrent = 0;
 694
 695         desc->bNbrPorts = ports;
 696         temp = 1 + (ports / 8);
 697         desc->bDescLength = 7 + 2 * temp;
 698
 699         /* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
 700         memset(&desc->u.hs.DeviceRemovable[0], 0, temp);
 701         memset(&desc->u.hs.DeviceRemovable[temp], 0xff, temp);
 702
 703         temp = HUB_CHAR_INDV_PORT_OCPM; /* per-port overcurrent reporting */
 704         if (HCS_PPC (ehci->hcs_params))
 705                 temp |= HUB_CHAR_INDV_PORT_LPSM; /* per-port power control */
 706         else
 707                 temp |= HUB_CHAR_NO_LPSM; /* no power switching */
 708 #if 0
 709 // re-enable when we support USB_PORT_FEAT_INDICATOR below.
 710         if (HCS_INDICATOR (ehci->hcs_params))
 711                 temp |= HUB_CHAR_PORTIND; /* per-port indicators (LEDs) */
 712 #endif
 713         desc->wHubCharacteristics = cpu_to_le16(temp);
 714 }
 715
 716 /*-------------------------------------------------------------------------*/
 717 #ifdef CONFIG_USB_HCD_TEST_MODE
 718
 719 #define EHSET_TEST_SINGLE_STEP_SET_FEATURE 0x06
 720
 721 static void usb_ehset_completion(struct urb *urb)
 722 {
 723         struct completion  *done = urb->context;
 724
 725         complete(done);
 726 }
 727 static int submit_single_step_set_feature(
 728         struct usb_hcd  *hcd,
 729         struct urb      *urb,
 730         int             is_setup
 731 );
 732
 733 /*
 734  * Allocate and initialize a control URB. This request will be used by the
 735  * EHSET SINGLE_STEP_SET_FEATURE test in which the DATA and STATUS stages
 736  * of the GetDescriptor request are sent 15 seconds after the SETUP stage.
 737  * Return NULL if failed.
 738  */
 739 static struct urb *request_single_step_set_feature_urb(
 740         struct usb_device       *udev,
 741         void                    *dr,
 742         void                    *buf,
 743         struct completion       *done
 744 ) {
 745         struct urb *urb;
 746         struct usb_hcd *hcd = bus_to_hcd(udev->bus);
 747         struct usb_host_endpoint *ep;
 748
 749         urb = usb_alloc_urb(0, GFP_KERNEL);
 750         if (!urb)
 751                 return NULL;
 752
 753         urb->pipe = usb_rcvctrlpipe(udev, 0);
 754         ep = (usb_pipein(urb->pipe) ? udev->ep_in : udev->ep_out)
 755                                 [usb_pipeendpoint(urb->pipe)];
 756         if (!ep) {
 757                 usb_free_urb(urb);
 758                 return NULL;
 759         }
 760
 761         urb->ep = ep;
 762         urb->dev = udev;
 763         urb->setup_packet = (void *)dr;
 764         urb->transfer_buffer = buf;
 765         urb->transfer_buffer_length = USB_DT_DEVICE_SIZE;
 766         urb->complete = usb_ehset_completion;
 767         urb->status = -EINPROGRESS;
 768         urb->actual_length = 0;
 769         urb->transfer_flags = URB_DIR_IN;
 770         usb_get_urb(urb);
 771         atomic_inc(&urb->use_count);
 772         atomic_inc(&urb->dev->urbnum);
 773         urb->setup_dma = dma_map_single(
 774                         hcd->self.controller,
 775                         urb->setup_packet,
 776                         sizeof(struct usb_ctrlrequest),
 777                         DMA_TO_DEVICE);
 778         urb->transfer_dma = dma_map_single(
 779                         hcd->self.controller,
 780                         urb->transfer_buffer,
 781                         urb->transfer_buffer_length,
 782                         DMA_FROM_DEVICE);
 783         urb->context = done;
 784         return urb;
 785 }
 786
 787 static int ehset_single_step_set_feature(struct usb_hcd *hcd, int port)
 788 {
 789         int retval = -ENOMEM;
 790         struct usb_ctrlrequest *dr;
 791         struct urb *urb;
 792         struct usb_device *udev;
 793         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 794         struct usb_device_descriptor *buf;
 795         DECLARE_COMPLETION_ONSTACK(done);
 796
 797         /* Obtain udev of the rhub's child port */
 798         udev = usb_hub_find_child(hcd->self.root_hub, port);
 799         if (!udev) {
 800                 ehci_err(ehci, "No device attached to the RootHub\n");
 801                 return -ENODEV;
 802         }
 803         buf = kmalloc(USB_DT_DEVICE_SIZE, GFP_KERNEL);
 804         if (!buf)
 805                 return -ENOMEM;
 806
 807         dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
 808         if (!dr) {
 809                 kfree(buf);
 810                 return -ENOMEM;
 811         }
 812
 813         /* Fill Setup packet for GetDescriptor */
 814         dr->bRequestType = USB_DIR_IN;
 815         dr->bRequest = USB_REQ_GET_DESCRIPTOR;
 816         dr->wValue = cpu_to_le16(USB_DT_DEVICE << 8);
 817         dr->wIndex = 0;
 818         dr->wLength = cpu_to_le16(USB_DT_DEVICE_SIZE);
 819         urb = request_single_step_set_feature_urb(udev, dr, buf, &done);
 820         if (!urb)
 821                 goto cleanup;
 822
 823         /* Submit just the SETUP stage */
 824         retval = submit_single_step_set_feature(hcd, urb, 1);
 825         if (retval)
 826                 goto out1;
 827         if (!wait_for_completion_timeout(&done, msecs_to_jiffies(2000))) {
 828                 usb_kill_urb(urb);
 829                 retval = -ETIMEDOUT;
 830                 ehci_err(ehci, "%s SETUP stage timed out on ep0\n", __func__);
 831                 goto out1;
 832         }
 833         msleep(15 * 1000);
 834
 835         /* Complete remaining DATA and STATUS stages using the same URB */
 836         urb->status = -EINPROGRESS;
 837         usb_get_urb(urb);
 838         atomic_inc(&urb->use_count);
 839         atomic_inc(&urb->dev->urbnum);
 840         retval = submit_single_step_set_feature(hcd, urb, 0);
 841         if (!retval && !wait_for_completion_timeout(&done,
 842                                                 msecs_to_jiffies(2000))) {
 843                 usb_kill_urb(urb);
 844                 retval = -ETIMEDOUT;
 845                 ehci_err(ehci, "%s IN stage timed out on ep0\n", __func__);
 846         }
 847 out1:
 848         usb_free_urb(urb);
 849 cleanup:
 850         kfree(dr);
 851         kfree(buf);
 852         return retval;
 853 }
 854 #endif /* CONFIG_USB_HCD_TEST_MODE */
 855 /*-------------------------------------------------------------------------*/
 856
 857 int ehci_hub_control(
 858         struct usb_hcd  *hcd,
 859         u16             typeReq,
 860         u16             wValue,
 861         u16             wIndex,
 862         char            *buf,
 863         u16             wLength
 864 ) {
 865         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 866         int             ports = HCS_N_PORTS (ehci->hcs_params);
 867         u32 __iomem     *status_reg = &ehci->regs->port_status[
 868                                 (wIndex & 0xff) - 1];
 869         u32 __iomem     *hostpc_reg = &ehci->regs->hostpc[(wIndex & 0xff) - 1];
 870         u32             temp, temp1, status;
 871         unsigned long   flags;
 872         int             retval = 0;
 873         unsigned        selector;
 874
 875         /*
 876          * FIXME:  support SetPortFeatures USB_PORT_FEAT_INDICATOR.
 877          * HCS_INDICATOR may say we can change LEDs to off/amber/green.
 878          * (track current state ourselves) ... blink for diagnostics,
 879          * power, "this is the one", etc.  EHCI spec supports this.
 880          */
 881
 882         spin_lock_irqsave (&ehci->lock, flags);
 883         switch (typeReq) {
 884         case ClearHubFeature:
 885                 switch (wValue) {
 886                 case C_HUB_LOCAL_POWER:
 887                 case C_HUB_OVER_CURRENT:
 888                         /* no hub-wide feature/status flags */
 889                         break;
 890                 default:
 891                         goto error;
 892                 }
 893                 break;
 894         case ClearPortFeature:
 895                 if (!wIndex || wIndex > ports)
 896                         goto error;
 897                 wIndex--;
 898                 temp = ehci_readl(ehci, status_reg);
 899                 temp &= ~PORT_RWC_BITS;
 900
 901                 /*
 902                  * Even if OWNER is set, so the port is owned by the
 903                  * companion controller, hub_wq needs to be able to clear
 904                  * the port-change status bits (especially
 905                  * USB_PORT_STAT_C_CONNECTION).
 906                  */
 907
 908                 switch (wValue) {
 909                 case USB_PORT_FEAT_ENABLE:
 910                         ehci_writel(ehci, temp & ~PORT_PE, status_reg);
 911                         break;
 912                 case USB_PORT_FEAT_C_ENABLE:
 913                         ehci_writel(ehci, temp | PORT_PEC, status_reg);
 914                         break;
 915                 case USB_PORT_FEAT_SUSPEND:
 916                         if (temp & PORT_RESET)
 917                                 goto error;
 918                         if (ehci->no_selective_suspend)
 919                                 break;
 920 #ifdef CONFIG_USB_OTG
 921                         if ((hcd->self.otg_port == (wIndex + 1))
 922                             && hcd->self.b_hnp_enable) {
 923                                 otg_start_hnp(hcd->usb_phy->otg);
 924                                 break;
 925                         }
 926 #endif
 927                         if (!(temp & PORT_SUSPEND))
 928                                 break;
 929                         if ((temp & PORT_PE) == 0)
 930                                 goto error;
 931
 932                         /* clear phy low-power mode before resume */
 933                         if (ehci->has_tdi_phy_lpm) {
 934                                 temp1 = ehci_readl(ehci, hostpc_reg);
 935                                 ehci_writel(ehci, temp1 & ~HOSTPC_PHCD,
 936                                                 hostpc_reg);
 937                                 spin_unlock_irqrestore(&ehci->lock, flags);
 938                                 msleep(5);/* wait to leave low-power mode */
 939                                 spin_lock_irqsave(&ehci->lock, flags);
 940                         }
 941                         /* resume signaling for 20 msec */
 942                         temp &= ~PORT_WAKE_BITS;
 943                         ehci_writel(ehci, temp | PORT_RESUME, status_reg);
 944                         ehci->reset_done[wIndex] = jiffies
 945                                         + msecs_to_jiffies(20);
 946                         set_bit(wIndex, &ehci->resuming_ports);
 947                         usb_hcd_start_port_resume(&hcd->self, wIndex);
 948                         break;
 949                 case USB_PORT_FEAT_C_SUSPEND:
 950                         clear_bit(wIndex, &ehci->port_c_suspend);
 951                         break;
 952                 case USB_PORT_FEAT_POWER:
 953                         if (HCS_PPC(ehci->hcs_params)) {
 954                                 spin_unlock_irqrestore(&ehci->lock, flags);
 955                                 ehci_port_power(ehci, wIndex, false);
 956                                 spin_lock_irqsave(&ehci->lock, flags);
 957                         }
 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.  hub_wq will turn the power back on.
1004                          */
1005                         if (((temp & PORT_OC) || (ehci->need_oc_pp_cycle))
1006                                         && HCS_PPC(ehci->hcs_params)) {
1007                                 spin_unlock_irqrestore(&ehci->lock, flags);
1008                                 ehci_port_power(ehci, wIndex, false);
1009                                 spin_lock_irqsave(&ehci->lock, flags);
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 hub_wq
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                                 spin_unlock_irqrestore(&ehci->lock, flags);
1192                                 ehci_port_power(ehci, wIndex, true);
1193                                 spin_lock_irqsave(&ehci->lock, flags);
1194                         }
1195                         break;
1196                 case USB_PORT_FEAT_RESET:
1197                         if (temp & (PORT_SUSPEND|PORT_RESUME))
1198                                 goto error;
1199                         /* line status bits may report this as low speed,
1200                          * which can be fine if this root hub has a
1201                          * transaction translator built in.
1202                          */
1203                         if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
1204                                         && !ehci_is_TDI(ehci)
1205                                         && PORT_USB11 (temp)) {
1206                                 ehci_dbg (ehci,
1207                                         "port %d low speed --> companion\n",
1208                                         wIndex + 1);
1209                                 temp |= PORT_OWNER;
1210                         } else {
1211                                 temp |= PORT_RESET;
1212                                 temp &= ~PORT_PE;
1213
1214                                 /*
1215                                  * caller must wait, then call GetPortStatus
1216                                  * usb 2.0 spec says 50 ms resets on root
1217                                  */
1218                                 ehci->reset_done [wIndex] = jiffies
1219                                                 + msecs_to_jiffies (50);
1220                         }
1221                         ehci_writel(ehci, temp, status_reg);
1222                         break;
1223
1224                 /* For downstream facing ports (these):  one hub port is put
1225                  * into test mode according to USB2 11.24.2.13, then the hub
1226                  * must be reset (which for root hub now means rmmod+modprobe,
1227                  * or else system reboot).  See EHCI 2.3.9 and 4.14 for info
1228                  * about the EHCI-specific stuff.
1229                  */
1230                 case USB_PORT_FEAT_TEST:
1231 #ifdef CONFIG_USB_HCD_TEST_MODE
1232                         if (selector == EHSET_TEST_SINGLE_STEP_SET_FEATURE) {
1233                                 spin_unlock_irqrestore(&ehci->lock, flags);
1234                                 retval = ehset_single_step_set_feature(hcd,
1235                                                                 wIndex + 1);
1236                                 spin_lock_irqsave(&ehci->lock, flags);
1237                                 break;
1238                         }
1239 #endif
1240                         if (!selector || selector > 5)
1241                                 goto error;
1242                         spin_unlock_irqrestore(&ehci->lock, flags);
1243                         ehci_quiesce(ehci);
1244                         spin_lock_irqsave(&ehci->lock, flags);
1245
1246                         /* Put all enabled ports into suspend */
1247                         while (ports--) {
1248                                 u32 __iomem *sreg =
1249                                                 &ehci->regs->port_status[ports];
1250
1251                                 temp = ehci_readl(ehci, sreg) & ~PORT_RWC_BITS;
1252                                 if (temp & PORT_PE)
1253                                         ehci_writel(ehci, temp | PORT_SUSPEND,
1254                                                         sreg);
1255                         }
1256
1257                         spin_unlock_irqrestore(&ehci->lock, flags);
1258                         ehci_halt(ehci);
1259                         spin_lock_irqsave(&ehci->lock, flags);
1260
1261                         temp = ehci_readl(ehci, status_reg);
1262                         temp |= selector << 16;
1263                         ehci_writel(ehci, temp, status_reg);
1264                         break;
1265
1266                 default:
1267                         goto error;
1268                 }
1269                 ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
1270                 break;
1271
1272         default:
1273 error:
1274                 /* "stall" on error */
1275                 retval = -EPIPE;
1276         }
1277 error_exit:
1278         spin_unlock_irqrestore (&ehci->lock, flags);
1279         return retval;
1280 }
1281 EXPORT_SYMBOL_GPL(ehci_hub_control);
1282
1283 static void ehci_relinquish_port(struct usb_hcd *hcd, int portnum)
1284 {
1285         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1286
1287         if (ehci_is_TDI(ehci))
1288                 return;
1289         set_owner(ehci, --portnum, PORT_OWNER);
1290 }
1291
1292 static int ehci_port_handed_over(struct usb_hcd *hcd, int portnum)
1293 {
1294         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1295         u32 __iomem             *reg;
1296
1297         if (ehci_is_TDI(ehci))
1298                 return 0;
1299         reg = &ehci->regs->port_status[portnum - 1];
1300         return ehci_readl(ehci, reg) & PORT_OWNER;
1301 }
1302
1303 static int ehci_port_power(struct ehci_hcd *ehci, int portnum, bool enable)
1304 {
1305         struct usb_hcd *hcd = ehci_to_hcd(ehci);
1306         u32 __iomem *status_reg = &ehci->regs->port_status[portnum];
1307         u32 temp = ehci_readl(ehci, status_reg) & ~PORT_RWC_BITS;
1308
1309         if (enable)
1310                 ehci_writel(ehci, temp | PORT_POWER, status_reg);
1311         else
1312                 ehci_writel(ehci, temp & ~PORT_POWER, status_reg);
1313
1314         if (hcd->driver->port_power)
1315                 hcd->driver->port_power(hcd, portnum, enable);
1316
1317         return 0;
1318 }