kernel/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         /*
 475          * msleep for USB_RESUME_TIMEOUT ms only if code is trying to resume
 476          * port
 477          */
 478         if (resume_needed) {
 479                 spin_unlock_irq(&ehci->lock);
 480                 msleep(USB_RESUME_TIMEOUT);
 481                 spin_lock_irq(&ehci->lock);
 482                 if (ehci->shutdown)
 483                         goto shutdown;
 484         }
 485
 486         i = HCS_N_PORTS (ehci->hcs_params);
 487         while (i--) {
 488                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 489                 if (test_bit(i, &resume_needed)) {
 490                         temp &= ~(PORT_RWC_BITS | PORT_SUSPEND | PORT_RESUME);
 491                         ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
 492                 }
 493         }
 494
 495         ehci->next_statechange = jiffies + msecs_to_jiffies(5);
 496         spin_unlock_irq(&ehci->lock);
 497
 498         ehci_handover_companion_ports(ehci);
 499
 500         /* Now we can safely re-enable irqs */
 501         spin_lock_irq(&ehci->lock);
 502         if (ehci->shutdown)
 503                 goto shutdown;
 504         ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
 505         (void) ehci_readl(ehci, &ehci->regs->intr_enable);
 506         spin_unlock_irq(&ehci->lock);
 507
 508         return 0;
 509
 510  shutdown:
 511         spin_unlock_irq(&ehci->lock);
 512         return -ESHUTDOWN;
 513 }
 514
 515 #else
 516
 517 #define ehci_bus_suspend        NULL
 518 #define ehci_bus_resume         NULL
 519
 520 #endif  /* CONFIG_PM */
 521
 522 /*-------------------------------------------------------------------------*/
 523
 524 /*
 525  * Sets the owner of a port
 526  */
 527 static void set_owner(struct ehci_hcd *ehci, int portnum, int new_owner)
 528 {
 529         u32 __iomem             *status_reg;
 530         u32                     port_status;
 531         int                     try;
 532
 533         status_reg = &ehci->regs->port_status[portnum];
 534
 535         /*
 536          * The controller won't set the OWNER bit if the port is
 537          * enabled, so this loop will sometimes require at least two
 538          * iterations: one to disable the port and one to set OWNER.
 539          */
 540         for (try = 4; try > 0; --try) {
 541                 spin_lock_irq(&ehci->lock);
 542                 port_status = ehci_readl(ehci, status_reg);
 543                 if ((port_status & PORT_OWNER) == new_owner
 544                                 || (port_status & (PORT_OWNER | PORT_CONNECT))
 545                                         == 0)
 546                         try = 0;
 547                 else {
 548                         port_status ^= PORT_OWNER;
 549                         port_status &= ~(PORT_PE | PORT_RWC_BITS);
 550                         ehci_writel(ehci, port_status, status_reg);
 551                 }
 552                 spin_unlock_irq(&ehci->lock);
 553                 if (try > 1)
 554                         msleep(5);
 555         }
 556 }
 557
 558 /*-------------------------------------------------------------------------*/
 559
 560 static int check_reset_complete (
 561         struct ehci_hcd *ehci,
 562         int             index,
 563         u32 __iomem     *status_reg,
 564         int             port_status
 565 ) {
 566         if (!(port_status & PORT_CONNECT))
 567                 return port_status;
 568
 569         /* if reset finished and it's still not enabled -- handoff */
 570         if (!(port_status & PORT_PE)) {
 571
 572                 /* with integrated TT, there's nobody to hand it to! */
 573                 if (ehci_is_TDI(ehci)) {
 574                         ehci_dbg (ehci,
 575                                 "Failed to enable port %d on root hub TT\n",
 576                                 index+1);
 577                         return port_status;
 578                 }
 579
 580                 ehci_dbg (ehci, "port %d full speed --> companion\n",
 581                         index + 1);
 582
 583                 // what happens if HCS_N_CC(params) == 0 ?
 584                 port_status |= PORT_OWNER;
 585                 port_status &= ~PORT_RWC_BITS;
 586                 ehci_writel(ehci, port_status, status_reg);
 587
 588                 /* ensure 440EPX ohci controller state is operational */
 589                 if (ehci->has_amcc_usb23)
 590                         set_ohci_hcfs(ehci, 1);
 591         } else {
 592                 ehci_dbg(ehci, "port %d reset complete, port enabled\n",
 593                         index + 1);
 594                 /* ensure 440EPx ohci controller state is suspended */
 595                 if (ehci->has_amcc_usb23)
 596                         set_ohci_hcfs(ehci, 0);
 597         }
 598
 599         return port_status;
 600 }
 601
 602 /*-------------------------------------------------------------------------*/
 603
 604
 605 /* build "status change" packet (one or two bytes) from HC registers */
 606
 607 static int
 608 ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
 609 {
 610         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 611         u32             temp, status;
 612         u32             mask;
 613         int             ports, i, retval = 1;
 614         unsigned long   flags;
 615         u32             ppcd = ~0;
 616
 617         /* init status to no-changes */
 618         buf [0] = 0;
 619         ports = HCS_N_PORTS (ehci->hcs_params);
 620         if (ports > 7) {
 621                 buf [1] = 0;
 622                 retval++;
 623         }
 624
 625         /* Inform the core about resumes-in-progress by returning
 626          * a non-zero value even if there are no status changes.
 627          */
 628         status = ehci->resuming_ports;
 629
 630         /* Some boards (mostly VIA?) report bogus overcurrent indications,
 631          * causing massive log spam unless we completely ignore them.  It
 632          * may be relevant that VIA VT8235 controllers, where PORT_POWER is
 633          * always set, seem to clear PORT_OCC and PORT_CSC when writing to
 634          * PORT_POWER; that's surprising, but maybe within-spec.
 635          */
 636         if (!ignore_oc)
 637                 mask = PORT_CSC | PORT_PEC | PORT_OCC;
 638         else
 639                 mask = PORT_CSC | PORT_PEC;
 640         // PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
 641
 642         /* no hub change reports (bit 0) for now (power, ...) */
 643
 644         /* port N changes (bit N)? */
 645         spin_lock_irqsave (&ehci->lock, flags);
 646
 647         /* get per-port change detect bits */
 648         if (ehci->has_ppcd)
 649                 ppcd = ehci_readl(ehci, &ehci->regs->status) >> 16;
 650
 651         for (i = 0; i < ports; i++) {
 652                 /* leverage per-port change bits feature */
 653                 if (ppcd & (1 << i))
 654                         temp = ehci_readl(ehci, &ehci->regs->port_status[i]);
 655                 else
 656                         temp = 0;
 657
 658                 /*
 659                  * Return status information even for ports with OWNER set.
 660                  * Otherwise hub_wq wouldn't see the disconnect event when a
 661                  * high-speed device is switched over to the companion
 662                  * controller by the user.
 663                  */
 664
 665                 if ((temp & mask) != 0 || test_bit(i, &ehci->port_c_suspend)
 666                                 || (ehci->reset_done[i] && time_after_eq(
 667                                         jiffies, ehci->reset_done[i]))) {
 668                         if (i < 7)
 669                             buf [0] |= 1 << (i + 1);
 670                         else
 671                             buf [1] |= 1 << (i - 7);
 672                         status = STS_PCD;
 673                 }
 674         }
 675
 676         /* If a resume is in progress, make sure it can finish */
 677         if (ehci->resuming_ports)
 678                 mod_timer(&hcd->rh_timer, jiffies + msecs_to_jiffies(25));
 679
 680         spin_unlock_irqrestore (&ehci->lock, flags);
 681         return status ? retval : 0;
 682 }
 683
 684 /*-------------------------------------------------------------------------*/
 685
 686 static void
 687 ehci_hub_descriptor (
 688         struct ehci_hcd                 *ehci,
 689         struct usb_hub_descriptor       *desc
 690 ) {
 691         int             ports = HCS_N_PORTS (ehci->hcs_params);
 692         u16             temp;
 693
 694         desc->bDescriptorType = USB_DT_HUB;
 695         desc->bPwrOn2PwrGood = 10;      /* ehci 1.0, 2.3.9 says 20ms max */
 696         desc->bHubContrCurrent = 0;
 697
 698         desc->bNbrPorts = ports;
 699         temp = 1 + (ports / 8);
 700         desc->bDescLength = 7 + 2 * temp;
 701
 702         /* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
 703         memset(&desc->u.hs.DeviceRemovable[0], 0, temp);
 704         memset(&desc->u.hs.DeviceRemovable[temp], 0xff, temp);
 705
 706         temp = HUB_CHAR_INDV_PORT_OCPM; /* per-port overcurrent reporting */
 707         if (HCS_PPC (ehci->hcs_params))
 708                 temp |= HUB_CHAR_INDV_PORT_LPSM; /* per-port power control */
 709         else
 710                 temp |= HUB_CHAR_NO_LPSM; /* no power switching */
 711 #if 0
 712 // re-enable when we support USB_PORT_FEAT_INDICATOR below.
 713         if (HCS_INDICATOR (ehci->hcs_params))
 714                 temp |= HUB_CHAR_PORTIND; /* per-port indicators (LEDs) */
 715 #endif
 716         desc->wHubCharacteristics = cpu_to_le16(temp);
 717 }
 718
 719 /*-------------------------------------------------------------------------*/
 720 #ifdef CONFIG_USB_HCD_TEST_MODE
 721
 722 #define EHSET_TEST_SINGLE_STEP_SET_FEATURE 0x06
 723
 724 static void usb_ehset_completion(struct urb *urb)
 725 {
 726         struct completion  *done = urb->context;
 727
 728         complete(done);
 729 }
 730 static int submit_single_step_set_feature(
 731         struct usb_hcd  *hcd,
 732         struct urb      *urb,
 733         int             is_setup
 734 );
 735
 736 /*
 737  * Allocate and initialize a control URB. This request will be used by the
 738  * EHSET SINGLE_STEP_SET_FEATURE test in which the DATA and STATUS stages
 739  * of the GetDescriptor request are sent 15 seconds after the SETUP stage.
 740  * Return NULL if failed.
 741  */
 742 static struct urb *request_single_step_set_feature_urb(
 743         struct usb_device       *udev,
 744         void                    *dr,
 745         void                    *buf,
 746         struct completion       *done
 747 ) {
 748         struct urb *urb;
 749         struct usb_hcd *hcd = bus_to_hcd(udev->bus);
 750         struct usb_host_endpoint *ep;
 751
 752         urb = usb_alloc_urb(0, GFP_KERNEL);
 753         if (!urb)
 754                 return NULL;
 755
 756         urb->pipe = usb_rcvctrlpipe(udev, 0);
 757         ep = (usb_pipein(urb->pipe) ? udev->ep_in : udev->ep_out)
 758                                 [usb_pipeendpoint(urb->pipe)];
 759         if (!ep) {
 760                 usb_free_urb(urb);
 761                 return NULL;
 762         }
 763
 764         urb->ep = ep;
 765         urb->dev = udev;
 766         urb->setup_packet = (void *)dr;
 767         urb->transfer_buffer = buf;
 768         urb->transfer_buffer_length = USB_DT_DEVICE_SIZE;
 769         urb->complete = usb_ehset_completion;
 770         urb->status = -EINPROGRESS;
 771         urb->actual_length = 0;
 772         urb->transfer_flags = URB_DIR_IN;
 773         usb_get_urb(urb);
 774         atomic_inc(&urb->use_count);
 775         atomic_inc(&urb->dev->urbnum);
 776         urb->setup_dma = dma_map_single(
 777                         hcd->self.controller,
 778                         urb->setup_packet,
 779                         sizeof(struct usb_ctrlrequest),
 780                         DMA_TO_DEVICE);
 781         urb->transfer_dma = dma_map_single(
 782                         hcd->self.controller,
 783                         urb->transfer_buffer,
 784                         urb->transfer_buffer_length,
 785                         DMA_FROM_DEVICE);
 786         urb->context = done;
 787         return urb;
 788 }
 789
 790 static int ehset_single_step_set_feature(struct usb_hcd *hcd, int port)
 791 {
 792         int retval = -ENOMEM;
 793         struct usb_ctrlrequest *dr;
 794         struct urb *urb;
 795         struct usb_device *udev;
 796         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 797         struct usb_device_descriptor *buf;
 798         DECLARE_COMPLETION_ONSTACK(done);
 799
 800         /* Obtain udev of the rhub's child port */
 801         udev = usb_hub_find_child(hcd->self.root_hub, port);
 802         if (!udev) {
 803                 ehci_err(ehci, "No device attached to the RootHub\n");
 804                 return -ENODEV;
 805         }
 806         buf = kmalloc(USB_DT_DEVICE_SIZE, GFP_KERNEL);
 807         if (!buf)
 808                 return -ENOMEM;
 809
 810         dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
 811         if (!dr) {
 812                 kfree(buf);
 813                 return -ENOMEM;
 814         }
 815
 816         /* Fill Setup packet for GetDescriptor */
 817         dr->bRequestType = USB_DIR_IN;
 818         dr->bRequest = USB_REQ_GET_DESCRIPTOR;
 819         dr->wValue = cpu_to_le16(USB_DT_DEVICE << 8);
 820         dr->wIndex = 0;
 821         dr->wLength = cpu_to_le16(USB_DT_DEVICE_SIZE);
 822         urb = request_single_step_set_feature_urb(udev, dr, buf, &done);
 823         if (!urb)
 824                 goto cleanup;
 825
 826         /* Submit just the SETUP stage */
 827         retval = submit_single_step_set_feature(hcd, urb, 1);
 828         if (retval)
 829                 goto out1;
 830         if (!wait_for_completion_timeout(&done, msecs_to_jiffies(2000))) {
 831                 usb_kill_urb(urb);
 832                 retval = -ETIMEDOUT;
 833                 ehci_err(ehci, "%s SETUP stage timed out on ep0\n", __func__);
 834                 goto out1;
 835         }
 836         msleep(15 * 1000);
 837
 838         /* Complete remaining DATA and STATUS stages using the same URB */
 839         urb->status = -EINPROGRESS;
 840         usb_get_urb(urb);
 841         atomic_inc(&urb->use_count);
 842         atomic_inc(&urb->dev->urbnum);
 843         retval = submit_single_step_set_feature(hcd, urb, 0);
 844         if (!retval && !wait_for_completion_timeout(&done,
 845                                                 msecs_to_jiffies(2000))) {
 846                 usb_kill_urb(urb);
 847                 retval = -ETIMEDOUT;
 848                 ehci_err(ehci, "%s IN stage timed out on ep0\n", __func__);
 849         }
 850 out1:
 851         usb_free_urb(urb);
 852 cleanup:
 853         kfree(dr);
 854         kfree(buf);
 855         return retval;
 856 }
 857 #endif /* CONFIG_USB_HCD_TEST_MODE */
 858 /*-------------------------------------------------------------------------*/
 859
 860 int ehci_hub_control(
 861         struct usb_hcd  *hcd,
 862         u16             typeReq,
 863         u16             wValue,
 864         u16             wIndex,
 865         char            *buf,
 866         u16             wLength
 867 ) {
 868         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 869         int             ports = HCS_N_PORTS (ehci->hcs_params);
 870         u32 __iomem     *status_reg = &ehci->regs->port_status[
 871                                 (wIndex & 0xff) - 1];
 872         u32 __iomem     *hostpc_reg = &ehci->regs->hostpc[(wIndex & 0xff) - 1];
 873         u32             temp, temp1, status;
 874         unsigned long   flags;
 875         int             retval = 0;
 876         unsigned        selector;
 877
 878         /*
 879          * FIXME:  support SetPortFeatures USB_PORT_FEAT_INDICATOR.
 880          * HCS_INDICATOR may say we can change LEDs to off/amber/green.
 881          * (track current state ourselves) ... blink for diagnostics,
 882          * power, "this is the one", etc.  EHCI spec supports this.
 883          */
 884
 885         spin_lock_irqsave (&ehci->lock, flags);
 886         switch (typeReq) {
 887         case ClearHubFeature:
 888                 switch (wValue) {
 889                 case C_HUB_LOCAL_POWER:
 890                 case C_HUB_OVER_CURRENT:
 891                         /* no hub-wide feature/status flags */
 892                         break;
 893                 default:
 894                         goto error;
 895                 }
 896                 break;
 897         case ClearPortFeature:
 898                 if (!wIndex || wIndex > ports)
 899                         goto error;
 900                 wIndex--;
 901                 temp = ehci_readl(ehci, status_reg);
 902                 temp &= ~PORT_RWC_BITS;
 903
 904                 /*
 905                  * Even if OWNER is set, so the port is owned by the
 906                  * companion controller, hub_wq needs to be able to clear
 907                  * the port-change status bits (especially
 908                  * USB_PORT_STAT_C_CONNECTION).
 909                  */
 910
 911                 switch (wValue) {
 912                 case USB_PORT_FEAT_ENABLE:
 913                         ehci_writel(ehci, temp & ~PORT_PE, status_reg);
 914                         break;
 915                 case USB_PORT_FEAT_C_ENABLE:
 916                         ehci_writel(ehci, temp | PORT_PEC, status_reg);
 917                         break;
 918                 case USB_PORT_FEAT_SUSPEND:
 919                         if (temp & PORT_RESET)
 920                                 goto error;
 921                         if (ehci->no_selective_suspend)
 922                                 break;
 923 #ifdef CONFIG_USB_OTG
 924                         if ((hcd->self.otg_port == (wIndex + 1))
 925                             && hcd->self.b_hnp_enable) {
 926                                 otg_start_hnp(hcd->usb_phy->otg);
 927                                 break;
 928                         }
 929 #endif
 930                         if (!(temp & PORT_SUSPEND))
 931                                 break;
 932                         if ((temp & PORT_PE) == 0)
 933                                 goto error;
 934
 935                         /* clear phy low-power mode before resume */
 936                         if (ehci->has_tdi_phy_lpm) {
 937                                 temp1 = ehci_readl(ehci, hostpc_reg);
 938                                 ehci_writel(ehci, temp1 & ~HOSTPC_PHCD,
 939                                                 hostpc_reg);
 940                                 spin_unlock_irqrestore(&ehci->lock, flags);
 941                                 msleep(5);/* wait to leave low-power mode */
 942                                 spin_lock_irqsave(&ehci->lock, flags);
 943                         }
 944                         /* resume signaling for 20 msec */
 945                         temp &= ~PORT_WAKE_BITS;
 946                         ehci_writel(ehci, temp | PORT_RESUME, status_reg);
 947                         ehci->reset_done[wIndex] = jiffies
 948                                         + msecs_to_jiffies(USB_RESUME_TIMEOUT);
 949                         set_bit(wIndex, &ehci->resuming_ports);
 950                         usb_hcd_start_port_resume(&hcd->self, wIndex);
 951                         break;
 952                 case USB_PORT_FEAT_C_SUSPEND:
 953                         clear_bit(wIndex, &ehci->port_c_suspend);
 954                         break;
 955                 case USB_PORT_FEAT_POWER:
 956                         if (HCS_PPC(ehci->hcs_params)) {
 957                                 spin_unlock_irqrestore(&ehci->lock, flags);
 958                                 ehci_port_power(ehci, wIndex, false);
 959                                 spin_lock_irqsave(&ehci->lock, flags);
 960                         }
 961                         break;
 962                 case USB_PORT_FEAT_C_CONNECTION:
 963                         ehci_writel(ehci, temp | PORT_CSC, status_reg);
 964                         break;
 965                 case USB_PORT_FEAT_C_OVER_CURRENT:
 966                         ehci_writel(ehci, temp | PORT_OCC, status_reg);
 967                         break;
 968                 case USB_PORT_FEAT_C_RESET:
 969                         /* GetPortStatus clears reset */
 970                         break;
 971                 default:
 972                         goto error;
 973                 }
 974                 ehci_readl(ehci, &ehci->regs->command); /* unblock posted write */
 975                 break;
 976         case GetHubDescriptor:
 977                 ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
 978                         buf);
 979                 break;
 980         case GetHubStatus:
 981                 /* no hub-wide feature/status flags */
 982                 memset (buf, 0, 4);
 983                 //cpu_to_le32s ((u32 *) buf);
 984                 break;
 985         case GetPortStatus:
 986                 if (!wIndex || wIndex > ports)
 987                         goto error;
 988                 wIndex--;
 989                 status = 0;
 990                 temp = ehci_readl(ehci, status_reg);
 991
 992                 // wPortChange bits
 993                 if (temp & PORT_CSC)
 994                         status |= USB_PORT_STAT_C_CONNECTION << 16;
 995                 if (temp & PORT_PEC)
 996                         status |= USB_PORT_STAT_C_ENABLE << 16;
 997
 998                 if ((temp & PORT_OCC) && !ignore_oc){
 999                         status |= USB_PORT_STAT_C_OVERCURRENT << 16;
1000
1001                         /*
1002                          * Hubs should disable port power on over-current.
1003                          * However, not all EHCI implementations do this
1004                          * automatically, even if they _do_ support per-port
1005                          * power switching; they're allowed to just limit the
1006                          * current.  hub_wq will turn the power back on.
1007                          */
1008                         if (((temp & PORT_OC) || (ehci->need_oc_pp_cycle))
1009                                         && HCS_PPC(ehci->hcs_params)) {
1010                                 spin_unlock_irqrestore(&ehci->lock, flags);
1011                                 ehci_port_power(ehci, wIndex, false);
1012                                 spin_lock_irqsave(&ehci->lock, flags);
1013                                 temp = ehci_readl(ehci, status_reg);
1014                         }
1015                 }
1016
1017                 /* no reset or resume pending */
1018                 if (!ehci->reset_done[wIndex]) {
1019
1020                         /* Remote Wakeup received? */
1021                         if (temp & PORT_RESUME) {
1022                                 /* resume signaling for 20 msec */
1023                                 ehci->reset_done[wIndex] = jiffies
1024                                                 + msecs_to_jiffies(20);
1025                                 usb_hcd_start_port_resume(&hcd->self, wIndex);
1026                                 set_bit(wIndex, &ehci->resuming_ports);
1027                                 /* check the port again */
1028                                 mod_timer(&ehci_to_hcd(ehci)->rh_timer,
1029                                                 ehci->reset_done[wIndex]);
1030                         }
1031
1032                 /* reset or resume not yet complete */
1033                 } else if (!time_after_eq(jiffies, ehci->reset_done[wIndex])) {
1034                         ;       /* wait until it is complete */
1035
1036                 /* resume completed */
1037                 } else if (test_bit(wIndex, &ehci->resuming_ports)) {
1038                         clear_bit(wIndex, &ehci->suspended_ports);
1039                         set_bit(wIndex, &ehci->port_c_suspend);
1040                         ehci->reset_done[wIndex] = 0;
1041                         usb_hcd_end_port_resume(&hcd->self, wIndex);
1042
1043                         /* stop resume signaling */
1044                         temp &= ~(PORT_RWC_BITS | PORT_SUSPEND | PORT_RESUME);
1045                         ehci_writel(ehci, temp, status_reg);
1046                         clear_bit(wIndex, &ehci->resuming_ports);
1047                         retval = ehci_handshake(ehci, status_reg,
1048                                         PORT_RESUME, 0, 2000 /* 2msec */);
1049                         if (retval != 0) {
1050                                 ehci_err(ehci, "port %d resume error %d\n",
1051                                                 wIndex + 1, retval);
1052                                 goto error;
1053                         }
1054                         temp = ehci_readl(ehci, status_reg);
1055
1056                 /* whoever resets must GetPortStatus to complete it!! */
1057                 } else {
1058                         status |= USB_PORT_STAT_C_RESET << 16;
1059                         ehci->reset_done [wIndex] = 0;
1060
1061                         /* force reset to complete */
1062                         ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESET),
1063                                         status_reg);
1064                         /* REVISIT:  some hardware needs 550+ usec to clear
1065                          * this bit; seems too long to spin routinely...
1066                          */
1067                         retval = ehci_handshake(ehci, status_reg,
1068                                         PORT_RESET, 0, 1000);
1069                         if (retval != 0) {
1070                                 ehci_err (ehci, "port %d reset error %d\n",
1071                                         wIndex + 1, retval);
1072                                 goto error;
1073                         }
1074
1075                         /* see what we found out */
1076                         temp = check_reset_complete (ehci, wIndex, status_reg,
1077                                         ehci_readl(ehci, status_reg));
1078                 }
1079
1080                 /* transfer dedicated ports to the companion hc */
1081                 if ((temp & PORT_CONNECT) &&
1082                                 test_bit(wIndex, &ehci->companion_ports)) {
1083                         temp &= ~PORT_RWC_BITS;
1084                         temp |= PORT_OWNER;
1085                         ehci_writel(ehci, temp, status_reg);
1086                         ehci_dbg(ehci, "port %d --> companion\n", wIndex + 1);
1087                         temp = ehci_readl(ehci, status_reg);
1088                 }
1089
1090                 /*
1091                  * Even if OWNER is set, there's no harm letting hub_wq
1092                  * see the wPortStatus values (they should all be 0 except
1093                  * for PORT_POWER anyway).
1094                  */
1095
1096                 if (temp & PORT_CONNECT) {
1097                         status |= USB_PORT_STAT_CONNECTION;
1098                         // status may be from integrated TT
1099                         if (ehci->has_hostpc) {
1100                                 temp1 = ehci_readl(ehci, hostpc_reg);
1101                                 status |= ehci_port_speed(ehci, temp1);
1102                         } else
1103                                 status |= ehci_port_speed(ehci, temp);
1104                 }
1105                 if (temp & PORT_PE)
1106                         status |= USB_PORT_STAT_ENABLE;
1107
1108                 /* maybe the port was unsuspended without our knowledge */
1109                 if (temp & (PORT_SUSPEND|PORT_RESUME)) {
1110                         status |= USB_PORT_STAT_SUSPEND;
1111                 } else if (test_bit(wIndex, &ehci->suspended_ports)) {
1112                         clear_bit(wIndex, &ehci->suspended_ports);
1113                         clear_bit(wIndex, &ehci->resuming_ports);
1114                         ehci->reset_done[wIndex] = 0;
1115                         if (temp & PORT_PE)
1116                                 set_bit(wIndex, &ehci->port_c_suspend);
1117                         usb_hcd_end_port_resume(&hcd->self, wIndex);
1118                 }
1119
1120                 if (temp & PORT_OC)
1121                         status |= USB_PORT_STAT_OVERCURRENT;
1122                 if (temp & PORT_RESET)
1123                         status |= USB_PORT_STAT_RESET;
1124                 if (temp & PORT_POWER)
1125                         status |= USB_PORT_STAT_POWER;
1126                 if (test_bit(wIndex, &ehci->port_c_suspend))
1127                         status |= USB_PORT_STAT_C_SUSPEND << 16;
1128
1129                 if (status & ~0xffff)   /* only if wPortChange is interesting */
1130                         dbg_port(ehci, "GetStatus", wIndex + 1, temp);
1131                 put_unaligned_le32(status, buf);
1132                 break;
1133         case SetHubFeature:
1134                 switch (wValue) {
1135                 case C_HUB_LOCAL_POWER:
1136                 case C_HUB_OVER_CURRENT:
1137                         /* no hub-wide feature/status flags */
1138                         break;
1139                 default:
1140                         goto error;
1141                 }
1142                 break;
1143         case SetPortFeature:
1144                 selector = wIndex >> 8;
1145                 wIndex &= 0xff;
1146                 if (unlikely(ehci->debug)) {
1147                         /* If the debug port is active any port
1148                          * feature requests should get denied */
1149                         if (wIndex == HCS_DEBUG_PORT(ehci->hcs_params) &&
1150                             (readl(&ehci->debug->control) & DBGP_ENABLED)) {
1151                                 retval = -ENODEV;
1152                                 goto error_exit;
1153                         }
1154                 }
1155                 if (!wIndex || wIndex > ports)
1156                         goto error;
1157                 wIndex--;
1158                 temp = ehci_readl(ehci, status_reg);
1159                 if (temp & PORT_OWNER)
1160                         break;
1161
1162                 temp &= ~PORT_RWC_BITS;
1163                 switch (wValue) {
1164                 case USB_PORT_FEAT_SUSPEND:
1165                         if (ehci->no_selective_suspend)
1166                                 break;
1167                         if ((temp & PORT_PE) == 0
1168                                         || (temp & PORT_RESET) != 0)
1169                                 goto error;
1170
1171                         /* After above check the port must be connected.
1172                          * Set appropriate bit thus could put phy into low power
1173                          * mode if we have tdi_phy_lpm feature
1174                          */
1175                         temp &= ~PORT_WKCONN_E;
1176                         temp |= PORT_WKDISC_E | PORT_WKOC_E;
1177                         ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
1178                         if (ehci->has_tdi_phy_lpm) {
1179                                 spin_unlock_irqrestore(&ehci->lock, flags);
1180                                 msleep(5);/* 5ms for HCD enter low pwr mode */
1181                                 spin_lock_irqsave(&ehci->lock, flags);
1182                                 temp1 = ehci_readl(ehci, hostpc_reg);
1183                                 ehci_writel(ehci, temp1 | HOSTPC_PHCD,
1184                                         hostpc_reg);
1185                                 temp1 = ehci_readl(ehci, hostpc_reg);
1186                                 ehci_dbg(ehci, "Port%d phy low pwr mode %s\n",
1187                                         wIndex, (temp1 & HOSTPC_PHCD) ?
1188                                         "succeeded" : "failed");
1189                         }
1190                         set_bit(wIndex, &ehci->suspended_ports);
1191                         break;
1192                 case USB_PORT_FEAT_POWER:
1193                         if (HCS_PPC(ehci->hcs_params)) {
1194                                 spin_unlock_irqrestore(&ehci->lock, flags);
1195                                 ehci_port_power(ehci, wIndex, true);
1196                                 spin_lock_irqsave(&ehci->lock, flags);
1197                         }
1198                         break;
1199                 case USB_PORT_FEAT_RESET:
1200                         if (temp & (PORT_SUSPEND|PORT_RESUME))
1201                                 goto error;
1202                         /* line status bits may report this as low speed,
1203                          * which can be fine if this root hub has a
1204                          * transaction translator built in.
1205                          */
1206                         if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
1207                                         && !ehci_is_TDI(ehci)
1208                                         && PORT_USB11 (temp)) {
1209                                 ehci_dbg (ehci,
1210                                         "port %d low speed --> companion\n",
1211                                         wIndex + 1);
1212                                 temp |= PORT_OWNER;
1213                         } else {
1214                                 temp |= PORT_RESET;
1215                                 temp &= ~PORT_PE;
1216
1217                                 /*
1218                                  * caller must wait, then call GetPortStatus
1219                                  * usb 2.0 spec says 50 ms resets on root
1220                                  */
1221                                 ehci->reset_done [wIndex] = jiffies
1222                                                 + msecs_to_jiffies (50);
1223                         }
1224                         ehci_writel(ehci, temp, status_reg);
1225                         break;
1226
1227                 /* For downstream facing ports (these):  one hub port is put
1228                  * into test mode according to USB2 11.24.2.13, then the hub
1229                  * must be reset (which for root hub now means rmmod+modprobe,
1230                  * or else system reboot).  See EHCI 2.3.9 and 4.14 for info
1231                  * about the EHCI-specific stuff.
1232                  */
1233                 case USB_PORT_FEAT_TEST:
1234 #ifdef CONFIG_USB_HCD_TEST_MODE
1235                         if (selector == EHSET_TEST_SINGLE_STEP_SET_FEATURE) {
1236                                 spin_unlock_irqrestore(&ehci->lock, flags);
1237                                 retval = ehset_single_step_set_feature(hcd,
1238                                                                 wIndex + 1);
1239                                 spin_lock_irqsave(&ehci->lock, flags);
1240                                 break;
1241                         }
1242 #endif
1243                         if (!selector || selector > 5)
1244                                 goto error;
1245                         spin_unlock_irqrestore(&ehci->lock, flags);
1246                         ehci_quiesce(ehci);
1247                         spin_lock_irqsave(&ehci->lock, flags);
1248
1249                         /* Put all enabled ports into suspend */
1250                         while (ports--) {
1251                                 u32 __iomem *sreg =
1252                                                 &ehci->regs->port_status[ports];
1253
1254                                 temp = ehci_readl(ehci, sreg) & ~PORT_RWC_BITS;
1255                                 if (temp & PORT_PE)
1256                                         ehci_writel(ehci, temp | PORT_SUSPEND,
1257                                                         sreg);
1258                         }
1259
1260                         spin_unlock_irqrestore(&ehci->lock, flags);
1261                         ehci_halt(ehci);
1262                         spin_lock_irqsave(&ehci->lock, flags);
1263
1264                         temp = ehci_readl(ehci, status_reg);
1265                         temp |= selector << 16;
1266                         ehci_writel(ehci, temp, status_reg);
1267                         break;
1268
1269                 default:
1270                         goto error;
1271                 }
1272                 ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
1273                 break;
1274
1275         default:
1276 error:
1277                 /* "stall" on error */
1278                 retval = -EPIPE;
1279         }
1280 error_exit:
1281         spin_unlock_irqrestore (&ehci->lock, flags);
1282         return retval;
1283 }
1284 EXPORT_SYMBOL_GPL(ehci_hub_control);
1285
1286 static void ehci_relinquish_port(struct usb_hcd *hcd, int portnum)
1287 {
1288         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1289
1290         if (ehci_is_TDI(ehci))
1291                 return;
1292         set_owner(ehci, --portnum, PORT_OWNER);
1293 }
1294
1295 static int ehci_port_handed_over(struct usb_hcd *hcd, int portnum)
1296 {
1297         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1298         u32 __iomem             *reg;
1299
1300         if (ehci_is_TDI(ehci))
1301                 return 0;
1302         reg = &ehci->regs->port_status[portnum - 1];
1303         return ehci_readl(ehci, reg) & PORT_OWNER;
1304 }
1305
1306 static int ehci_port_power(struct ehci_hcd *ehci, int portnum, bool enable)
1307 {
1308         struct usb_hcd *hcd = ehci_to_hcd(ehci);
1309         u32 __iomem *status_reg = &ehci->regs->port_status[portnum];
1310         u32 temp = ehci_readl(ehci, status_reg) & ~PORT_RWC_BITS;
1311
1312         if (enable)
1313                 ehci_writel(ehci, temp | PORT_POWER, status_reg);
1314         else
1315                 ehci_writel(ehci, temp & ~PORT_POWER, status_reg);
1316
1317         if (hcd->driver->port_power)
1318                 hcd->driver->port_power(hcd, portnum, enable);
1319
1320         return 0;
1321 }