drivers/usb/host/ehci-hub.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2001-2004 by David Brownell
   4  */
   5
   6 /* this file is part of ehci-hcd.c */
   7
   8 /*-------------------------------------------------------------------------*/
   9
  10 /*
  11  * EHCI Root Hub ... the nonsharable stuff
  12  *
  13  * Registers don't need cpu_to_le32, that happens transparently
  14  */
  15
  16 /*-------------------------------------------------------------------------*/
  17
  18 #define PORT_WAKE_BITS  (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
  19
  20 #ifdef  CONFIG_PM
  21
  22 static void unlink_empty_async_suspended(struct ehci_hcd *ehci);
  23
  24 static int persist_enabled_on_companion(struct usb_device *udev, void *unused)
  25 {
  26         return !udev->maxchild && udev->persist_enabled &&
  27                 udev->bus->root_hub->speed < USB_SPEED_HIGH;
  28 }
  29
  30 /* After a power loss, ports that were owned by the companion must be
  31  * reset so that the companion can still own them.
  32  */
  33 static void ehci_handover_companion_ports(struct ehci_hcd *ehci)
  34 {
  35         u32 __iomem     *reg;
  36         u32             status;
  37         int             port;
  38         __le32          buf;
  39         struct usb_hcd  *hcd = ehci_to_hcd(ehci);
  40
  41         if (!ehci->owned_ports)
  42                 return;
  43
  44         /*
  45          * USB 1.1 devices are mostly HIDs, which don't need to persist across
  46          * suspends. If we ensure that none of our companion's devices have
  47          * persist_enabled (by looking through all USB 1.1 buses in the system),
  48          * we can skip this and avoid slowing resume down. Devices without
  49          * persist will just get reenumerated shortly after resume anyway.
  50          */
  51         if (!usb_for_each_dev(NULL, persist_enabled_on_companion))
  52                 return;
  53
  54         /* Make sure the ports are powered */
  55         port = HCS_N_PORTS(ehci->hcs_params);
  56         while (port--) {
  57                 if (test_bit(port, &ehci->owned_ports)) {
  58                         reg = &ehci->regs->port_status[port];
  59                         status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
  60                         if (!(status & PORT_POWER))
  61                                 ehci_port_power(ehci, port, true);
  62                 }
  63         }
  64
  65         /* Give the connections some time to appear */
  66         msleep(20);
  67
  68         spin_lock_irq(&ehci->lock);
  69         port = HCS_N_PORTS(ehci->hcs_params);
  70         while (port--) {
  71                 if (test_bit(port, &ehci->owned_ports)) {
  72                         reg = &ehci->regs->port_status[port];
  73                         status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
  74
  75                         /* Port already owned by companion? */
  76                         if (status & PORT_OWNER)
  77                                 clear_bit(port, &ehci->owned_ports);
  78                         else if (test_bit(port, &ehci->companion_ports))
  79                                 ehci_writel(ehci, status & ~PORT_PE, reg);
  80                         else {
  81                                 spin_unlock_irq(&ehci->lock);
  82                                 ehci_hub_control(hcd, SetPortFeature,
  83                                                 USB_PORT_FEAT_RESET, port + 1,
  84                                                 NULL, 0);
  85                                 spin_lock_irq(&ehci->lock);
  86                         }
  87                 }
  88         }
  89         spin_unlock_irq(&ehci->lock);
  90
  91         if (!ehci->owned_ports)
  92                 return;
  93         msleep(90);             /* Wait for resets to complete */
  94
  95         spin_lock_irq(&ehci->lock);
  96         port = HCS_N_PORTS(ehci->hcs_params);
  97         while (port--) {
  98                 if (test_bit(port, &ehci->owned_ports)) {
  99                         spin_unlock_irq(&ehci->lock);
 100                         ehci_hub_control(hcd, GetPortStatus,
 101                                         0, port + 1,
 102                                         (char *) &buf, sizeof(buf));
 103                         spin_lock_irq(&ehci->lock);
 104
 105                         /* The companion should now own the port,
 106                          * but if something went wrong the port must not
 107                          * remain enabled.
 108                          */
 109                         reg = &ehci->regs->port_status[port];
 110                         status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
 111                         if (status & PORT_OWNER)
 112                                 ehci_writel(ehci, status | PORT_CSC, reg);
 113                         else {
 114                                 ehci_dbg(ehci, "failed handover port %d: %x\n",
 115                                                 port + 1, status);
 116                                 ehci_writel(ehci, status & ~PORT_PE, reg);
 117                         }
 118                 }
 119         }
 120
 121         ehci->owned_ports = 0;
 122         spin_unlock_irq(&ehci->lock);
 123 }
 124
 125 static int ehci_port_change(struct ehci_hcd *ehci)
 126 {
 127         int i = HCS_N_PORTS(ehci->hcs_params);
 128
 129         /* First check if the controller indicates a change event */
 130
 131         if (ehci_readl(ehci, &ehci->regs->status) & STS_PCD)
 132                 return 1;
 133
 134         /*
 135          * Not all controllers appear to update this while going from D3 to D0,
 136          * so check the individual port status registers as well
 137          */
 138
 139         while (i--)
 140                 if (ehci_readl(ehci, &ehci->regs->port_status[i]) & PORT_CSC)
 141                         return 1;
 142
 143         return 0;
 144 }
 145
 146 void ehci_adjust_port_wakeup_flags(struct ehci_hcd *ehci,
 147                 bool suspending, bool do_wakeup)
 148 {
 149         int             port;
 150         u32             temp;
 151
 152         /* If remote wakeup is enabled for the root hub but disabled
 153          * for the controller, we must adjust all the port wakeup flags
 154          * when the controller is suspended or resumed.  In all other
 155          * cases they don't need to be changed.
 156          */
 157         if (!ehci_to_hcd(ehci)->self.root_hub->do_remote_wakeup || do_wakeup)
 158                 return;
 159
 160         spin_lock_irq(&ehci->lock);
 161
 162         /* clear phy low-power mode before changing wakeup flags */
 163         if (ehci->has_tdi_phy_lpm) {
 164                 port = HCS_N_PORTS(ehci->hcs_params);
 165                 while (port--) {
 166                         u32 __iomem     *hostpc_reg = &ehci->regs->hostpc[port];
 167
 168                         temp = ehci_readl(ehci, hostpc_reg);
 169                         ehci_writel(ehci, temp & ~HOSTPC_PHCD, hostpc_reg);
 170                 }
 171                 spin_unlock_irq(&ehci->lock);
 172                 msleep(5);
 173                 spin_lock_irq(&ehci->lock);
 174         }
 175
 176         port = HCS_N_PORTS(ehci->hcs_params);
 177         while (port--) {
 178                 u32 __iomem     *reg = &ehci->regs->port_status[port];
 179                 u32             t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
 180                 u32             t2 = t1 & ~PORT_WAKE_BITS;
 181
 182                 /* If we are suspending the controller, clear the flags.
 183                  * If we are resuming the controller, set the wakeup flags.
 184                  */
 185                 if (!suspending) {
 186                         if (t1 & PORT_CONNECT)
 187                                 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
 188                         else
 189                                 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
 190                 }
 191                 ehci_writel(ehci, t2, reg);
 192         }
 193
 194         /* enter phy low-power mode again */
 195         if (ehci->has_tdi_phy_lpm) {
 196                 port = HCS_N_PORTS(ehci->hcs_params);
 197                 while (port--) {
 198                         u32 __iomem     *hostpc_reg = &ehci->regs->hostpc[port];
 199
 200                         temp = ehci_readl(ehci, hostpc_reg);
 201                         ehci_writel(ehci, temp | HOSTPC_PHCD, hostpc_reg);
 202                 }
 203         }
 204
 205         /* Does the root hub have a port wakeup pending? */
 206         if (!suspending && ehci_port_change(ehci))
 207                 usb_hcd_resume_root_hub(ehci_to_hcd(ehci));
 208
 209         spin_unlock_irq(&ehci->lock);
 210 }
 211 EXPORT_SYMBOL_GPL(ehci_adjust_port_wakeup_flags);
 212
 213 static int ehci_bus_suspend (struct usb_hcd *hcd)
 214 {
 215         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 216         int                     port;
 217         int                     mask;
 218         int                     changed;
 219         bool                    fs_idle_delay;
 220
 221         ehci_dbg(ehci, "suspend root hub\n");
 222
 223         if (time_before (jiffies, ehci->next_statechange))
 224                 msleep(5);
 225
 226         /* stop the schedules */
 227         ehci_quiesce(ehci);
 228
 229         spin_lock_irq (&ehci->lock);
 230         if (ehci->rh_state < EHCI_RH_RUNNING)
 231                 goto done;
 232
 233         /* Once the controller is stopped, port resumes that are already
 234          * in progress won't complete.  Hence if remote wakeup is enabled
 235          * for the root hub and any ports are in the middle of a resume or
 236          * remote wakeup, we must fail the suspend.
 237          */
 238         if (hcd->self.root_hub->do_remote_wakeup) {
 239                 if (ehci->resuming_ports) {
 240                         spin_unlock_irq(&ehci->lock);
 241                         ehci_dbg(ehci, "suspend failed because a port is resuming\n");
 242                         return -EBUSY;
 243                 }
 244         }
 245
 246         /* Unlike other USB host controller types, EHCI doesn't have
 247          * any notion of "global" or bus-wide suspend.  The driver has
 248          * to manually suspend all the active unsuspended ports, and
 249          * then manually resume them in the bus_resume() routine.
 250          */
 251         ehci->bus_suspended = 0;
 252         ehci->owned_ports = 0;
 253         changed = 0;
 254         fs_idle_delay = false;
 255         port = HCS_N_PORTS(ehci->hcs_params);
 256         while (port--) {
 257                 u32 __iomem     *reg = &ehci->regs->port_status [port];
 258                 u32             t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
 259                 u32             t2 = t1 & ~PORT_WAKE_BITS;
 260
 261                 /* keep track of which ports we suspend */
 262                 if (t1 & PORT_OWNER)
 263                         set_bit(port, &ehci->owned_ports);
 264                 else if ((t1 & PORT_PE) && !(t1 & PORT_SUSPEND)) {
 265                         t2 |= PORT_SUSPEND;
 266                         set_bit(port, &ehci->bus_suspended);
 267                 }
 268
 269                 /* enable remote wakeup on all ports, if told to do so */
 270                 if (hcd->self.root_hub->do_remote_wakeup) {
 271                         /* only enable appropriate wake bits, otherwise the
 272                          * hardware can not go phy low power mode. If a race
 273                          * condition happens here(connection change during bits
 274                          * set), the port change detection will finally fix it.
 275                          */
 276                         if (t1 & PORT_CONNECT)
 277                                 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
 278                         else
 279                                 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
 280                 }
 281
 282                 if (t1 != t2) {
 283                         /*
 284                          * On some controllers, Wake-On-Disconnect will
 285                          * generate false wakeup signals until the bus
 286                          * switches over to full-speed idle.  For their
 287                          * sake, add a delay if we need one.
 288                          */
 289                         if ((t2 & PORT_WKDISC_E) &&
 290                                         ehci_port_speed(ehci, t2) ==
 291                                                 USB_PORT_STAT_HIGH_SPEED)
 292                                 fs_idle_delay = true;
 293                         ehci_writel(ehci, t2, reg);
 294                         changed = 1;
 295                 }
 296         }
 297         spin_unlock_irq(&ehci->lock);
 298
 299         if (changed && ehci_has_fsl_susp_errata(ehci))
 300                 /*
 301                  * Wait for at least 10 millisecondes to ensure the controller
 302                  * enter the suspend status before initiating a port resume
 303                  * using the Force Port Resume bit (Not-EHCI compatible).
 304                  */
 305                 usleep_range(10000, 20000);
 306
 307         if ((changed && ehci->has_tdi_phy_lpm) || fs_idle_delay) {
 308                 /*
 309                  * Wait for HCD to enter low-power mode or for the bus
 310                  * to switch to full-speed idle.
 311                  */
 312                 usleep_range(5000, 5500);
 313         }
 314
 315         if (changed && ehci->has_tdi_phy_lpm) {
 316                 spin_lock_irq(&ehci->lock);
 317                 port = HCS_N_PORTS(ehci->hcs_params);
 318                 while (port--) {
 319                         u32 __iomem     *hostpc_reg = &ehci->regs->hostpc[port];
 320                         u32             t3;
 321
 322                         t3 = ehci_readl(ehci, hostpc_reg);
 323                         ehci_writel(ehci, t3 | HOSTPC_PHCD, hostpc_reg);
 324                         t3 = ehci_readl(ehci, hostpc_reg);
 325                         ehci_dbg(ehci, "Port %d phy low-power mode %s\n",
 326                                         port, (t3 & HOSTPC_PHCD) ?
 327                                         "succeeded" : "failed");
 328                 }
 329                 spin_unlock_irq(&ehci->lock);
 330         }
 331
 332         /* Apparently some devices need a >= 1-uframe delay here */
 333         if (ehci->bus_suspended)
 334                 udelay(150);
 335
 336         /* turn off now-idle HC */
 337         ehci_halt (ehci);
 338
 339         spin_lock_irq(&ehci->lock);
 340         if (ehci->enabled_hrtimer_events & BIT(EHCI_HRTIMER_POLL_DEAD))
 341                 ehci_handle_controller_death(ehci);
 342         if (ehci->rh_state != EHCI_RH_RUNNING)
 343                 goto done;
 344         ehci->rh_state = EHCI_RH_SUSPENDED;
 345
 346         unlink_empty_async_suspended(ehci);
 347
 348         /* Some Synopsys controllers mistakenly leave IAA turned on */
 349         ehci_writel(ehci, STS_IAA, &ehci->regs->status);
 350
 351         /* Any IAA cycle that started before the suspend is now invalid */
 352         end_iaa_cycle(ehci);
 353         ehci_handle_start_intr_unlinks(ehci);
 354         ehci_handle_intr_unlinks(ehci);
 355         end_free_itds(ehci);
 356
 357         /* allow remote wakeup */
 358         mask = INTR_MASK;
 359         if (!hcd->self.root_hub->do_remote_wakeup)
 360                 mask &= ~STS_PCD;
 361         ehci_writel(ehci, mask, &ehci->regs->intr_enable);
 362         ehci_readl(ehci, &ehci->regs->intr_enable);
 363
 364  done:
 365         ehci->next_statechange = jiffies + msecs_to_jiffies(10);
 366         ehci->enabled_hrtimer_events = 0;
 367         ehci->next_hrtimer_event = EHCI_HRTIMER_NO_EVENT;
 368         spin_unlock_irq (&ehci->lock);
 369
 370         hrtimer_cancel(&ehci->hrtimer);
 371         return 0;
 372 }
 373
 374
 375 /* caller has locked the root hub, and should reset/reinit on error */
 376 static int ehci_bus_resume (struct usb_hcd *hcd)
 377 {
 378         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 379         u32                     temp;
 380         u32                     power_okay;
 381         int                     i;
 382         unsigned long           resume_needed = 0;
 383
 384         if (time_before (jiffies, ehci->next_statechange))
 385                 msleep(5);
 386         spin_lock_irq (&ehci->lock);
 387         if (!HCD_HW_ACCESSIBLE(hcd) || ehci->shutdown)
 388                 goto shutdown;
 389
 390         if (unlikely(ehci->debug)) {
 391                 if (!dbgp_reset_prep(hcd))
 392                         ehci->debug = NULL;
 393                 else
 394                         dbgp_external_startup(hcd);
 395         }
 396
 397         /* Ideally and we've got a real resume here, and no port's power
 398          * was lost.  (For PCI, that means Vaux was maintained.)  But we
 399          * could instead be restoring a swsusp snapshot -- so that BIOS was
 400          * the last user of the controller, not reset/pm hardware keeping
 401          * state we gave to it.
 402          */
 403         power_okay = ehci_readl(ehci, &ehci->regs->intr_enable);
 404         ehci_dbg(ehci, "resume root hub%s\n",
 405                         power_okay ? "" : " after power loss");
 406
 407         /* at least some APM implementations will try to deliver
 408          * IRQs right away, so delay them until we're ready.
 409          */
 410         ehci_writel(ehci, 0, &ehci->regs->intr_enable);
 411
 412         /* re-init operational registers */
 413         ehci_writel(ehci, 0, &ehci->regs->segment);
 414         ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
 415         ehci_writel(ehci, (u32) ehci->async->qh_dma, &ehci->regs->async_next);
 416
 417         /* restore CMD_RUN, framelist size, and irq threshold */
 418         ehci->command |= CMD_RUN;
 419         ehci_writel(ehci, ehci->command, &ehci->regs->command);
 420         ehci->rh_state = EHCI_RH_RUNNING;
 421
 422         /*
 423          * According to Bugzilla #8190, the port status for some controllers
 424          * will be wrong without a delay. At their wrong status, the port
 425          * is enabled, but not suspended neither resumed.
 426          */
 427         i = HCS_N_PORTS(ehci->hcs_params);
 428         while (i--) {
 429                 temp = ehci_readl(ehci, &ehci->regs->port_status[i]);
 430                 if ((temp & PORT_PE) &&
 431                                 !(temp & (PORT_SUSPEND | PORT_RESUME))) {
 432                         ehci_dbg(ehci, "Port status(0x%x) is wrong\n", temp);
 433                         spin_unlock_irq(&ehci->lock);
 434                         msleep(8);
 435                         spin_lock_irq(&ehci->lock);
 436                         break;
 437                 }
 438         }
 439
 440         if (ehci->shutdown)
 441                 goto shutdown;
 442
 443         /* clear phy low-power mode before resume */
 444         if (ehci->bus_suspended && ehci->has_tdi_phy_lpm) {
 445                 i = HCS_N_PORTS(ehci->hcs_params);
 446                 while (i--) {
 447                         if (test_bit(i, &ehci->bus_suspended)) {
 448                                 u32 __iomem     *hostpc_reg =
 449                                                         &ehci->regs->hostpc[i];
 450
 451                                 temp = ehci_readl(ehci, hostpc_reg);
 452                                 ehci_writel(ehci, temp & ~HOSTPC_PHCD,
 453                                                 hostpc_reg);
 454                         }
 455                 }
 456                 spin_unlock_irq(&ehci->lock);
 457                 msleep(5);
 458                 spin_lock_irq(&ehci->lock);
 459                 if (ehci->shutdown)
 460                         goto shutdown;
 461         }
 462
 463         /* manually resume the ports we suspended during bus_suspend() */
 464         i = HCS_N_PORTS (ehci->hcs_params);
 465         while (i--) {
 466                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 467                 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
 468                 if (test_bit(i, &ehci->bus_suspended) &&
 469                                 (temp & PORT_SUSPEND)) {
 470                         temp |= PORT_RESUME;
 471                         set_bit(i, &resume_needed);
 472                 }
 473                 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
 474         }
 475
 476         /*
 477          * msleep for USB_RESUME_TIMEOUT ms only if code is trying to resume
 478          * port
 479          */
 480         if (resume_needed) {
 481                 spin_unlock_irq(&ehci->lock);
 482                 msleep(USB_RESUME_TIMEOUT);
 483                 spin_lock_irq(&ehci->lock);
 484                 if (ehci->shutdown)
 485                         goto shutdown;
 486         }
 487
 488         i = HCS_N_PORTS (ehci->hcs_params);
 489         while (i--) {
 490                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 491                 if (test_bit(i, &resume_needed)) {
 492                         temp &= ~(PORT_RWC_BITS | PORT_SUSPEND | PORT_RESUME);
 493                         ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
 494                 }
 495         }
 496
 497         ehci->next_statechange = jiffies + msecs_to_jiffies(5);
 498         spin_unlock_irq(&ehci->lock);
 499
 500         ehci_handover_companion_ports(ehci);
 501
 502         /* Now we can safely re-enable irqs */
 503         spin_lock_irq(&ehci->lock);
 504         if (ehci->shutdown)
 505                 goto shutdown;
 506         ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
 507         (void) ehci_readl(ehci, &ehci->regs->intr_enable);
 508         spin_unlock_irq(&ehci->lock);
 509
 510         return 0;
 511
 512  shutdown:
 513         spin_unlock_irq(&ehci->lock);
 514         return -ESHUTDOWN;
 515 }
 516
 517 static unsigned long ehci_get_resuming_ports(struct usb_hcd *hcd)
 518 {
 519         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
 520
 521         return ehci->resuming_ports;
 522 }
 523
 524 #else
 525
 526 #define ehci_bus_suspend        NULL
 527 #define ehci_bus_resume         NULL
 528 #define ehci_get_resuming_ports NULL
 529
 530 #endif  /* CONFIG_PM */
 531
 532 /*-------------------------------------------------------------------------*/
 533
 534 /*
 535  * Sets the owner of a port
 536  */
 537 static void set_owner(struct ehci_hcd *ehci, int portnum, int new_owner)
 538 {
 539         u32 __iomem             *status_reg;
 540         u32                     port_status;
 541         int                     try;
 542
 543         status_reg = &ehci->regs->port_status[portnum];
 544
 545         /*
 546          * The controller won't set the OWNER bit if the port is
 547          * enabled, so this loop will sometimes require at least two
 548          * iterations: one to disable the port and one to set OWNER.
 549          */
 550         for (try = 4; try > 0; --try) {
 551                 spin_lock_irq(&ehci->lock);
 552                 port_status = ehci_readl(ehci, status_reg);
 553                 if ((port_status & PORT_OWNER) == new_owner
 554                                 || (port_status & (PORT_OWNER | PORT_CONNECT))
 555                                         == 0)
 556                         try = 0;
 557                 else {
 558                         port_status ^= PORT_OWNER;
 559                         port_status &= ~(PORT_PE | PORT_RWC_BITS);
 560                         ehci_writel(ehci, port_status, status_reg);
 561                 }
 562                 spin_unlock_irq(&ehci->lock);
 563                 if (try > 1)
 564                         msleep(5);
 565         }
 566 }
 567
 568 /*-------------------------------------------------------------------------*/
 569
 570 static int check_reset_complete (
 571         struct ehci_hcd *ehci,
 572         int             index,
 573         u32 __iomem     *status_reg,
 574         int             port_status
 575 ) {
 576         if (!(port_status & PORT_CONNECT))
 577                 return port_status;
 578
 579         /* if reset finished and it's still not enabled -- handoff */
 580         if (!(port_status & PORT_PE)) {
 581
 582                 /* with integrated TT, there's nobody to hand it to! */
 583                 if (ehci_is_TDI(ehci)) {
 584                         ehci_dbg (ehci,
 585                                 "Failed to enable port %d on root hub TT\n",
 586                                 index+1);
 587                         return port_status;
 588                 }
 589
 590                 ehci_dbg (ehci, "port %d full speed --> companion\n",
 591                         index + 1);
 592
 593                 // what happens if HCS_N_CC(params) == 0 ?
 594                 port_status |= PORT_OWNER;
 595                 port_status &= ~PORT_RWC_BITS;
 596                 ehci_writel(ehci, port_status, status_reg);
 597
 598                 /* ensure 440EPX ohci controller state is operational */
 599                 if (ehci->has_amcc_usb23)
 600                         set_ohci_hcfs(ehci, 1);
 601         } else {
 602                 ehci_dbg(ehci, "port %d reset complete, port enabled\n",
 603                         index + 1);
 604                 /* ensure 440EPx ohci controller state is suspended */
 605                 if (ehci->has_amcc_usb23)
 606                         set_ohci_hcfs(ehci, 0);
 607         }
 608
 609         return port_status;
 610 }
 611
 612 /*-------------------------------------------------------------------------*/
 613
 614
 615 /* build "status change" packet (one or two bytes) from HC registers */
 616
 617 static int
 618 ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
 619 {
 620         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 621         u32             temp, status;
 622         u32             mask;
 623         int             ports, i, retval = 1;
 624         unsigned long   flags;
 625         u32             ppcd = ~0;
 626
 627         /* init status to no-changes */
 628         buf [0] = 0;
 629         ports = HCS_N_PORTS (ehci->hcs_params);
 630         if (ports > 7) {
 631                 buf [1] = 0;
 632                 retval++;
 633         }
 634
 635         /* Inform the core about resumes-in-progress by returning
 636          * a non-zero value even if there are no status changes.
 637          */
 638         status = ehci->resuming_ports;
 639
 640         /* Some boards (mostly VIA?) report bogus overcurrent indications,
 641          * causing massive log spam unless we completely ignore them.  It
 642          * may be relevant that VIA VT8235 controllers, where PORT_POWER is
 643          * always set, seem to clear PORT_OCC and PORT_CSC when writing to
 644          * PORT_POWER; that's surprising, but maybe within-spec.
 645          */
 646         if (!ignore_oc && !ehci->spurious_oc)
 647                 mask = PORT_CSC | PORT_PEC | PORT_OCC;
 648         else
 649                 mask = PORT_CSC | PORT_PEC;
 650         // PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
 651
 652         /* no hub change reports (bit 0) for now (power, ...) */
 653
 654         /* port N changes (bit N)? */
 655         spin_lock_irqsave (&ehci->lock, flags);
 656
 657         /* get per-port change detect bits */
 658         if (ehci->has_ppcd)
 659                 ppcd = ehci_readl(ehci, &ehci->regs->status) >> 16;
 660
 661         for (i = 0; i < ports; i++) {
 662                 /* leverage per-port change bits feature */
 663                 if (ppcd & (1 << i))
 664                         temp = ehci_readl(ehci, &ehci->regs->port_status[i]);
 665                 else
 666                         temp = 0;
 667
 668                 /*
 669                  * Return status information even for ports with OWNER set.
 670                  * Otherwise hub_wq wouldn't see the disconnect event when a
 671                  * high-speed device is switched over to the companion
 672                  * controller by the user.
 673                  */
 674
 675                 if ((temp & mask) != 0 || test_bit(i, &ehci->port_c_suspend)
 676                                 || (ehci->reset_done[i] && time_after_eq(
 677                                         jiffies, ehci->reset_done[i]))
 678                                 || ehci_has_ci_pec_bug(ehci, temp)) {
 679                         if (i < 7)
 680                             buf [0] |= 1 << (i + 1);
 681                         else
 682                             buf [1] |= 1 << (i - 7);
 683                         status = STS_PCD;
 684                 }
 685         }
 686
 687         /* If a resume is in progress, make sure it can finish */
 688         if (ehci->resuming_ports)
 689                 mod_timer(&hcd->rh_timer, jiffies + msecs_to_jiffies(25));
 690
 691         spin_unlock_irqrestore (&ehci->lock, flags);
 692         return status ? retval : 0;
 693 }
 694
 695 /*-------------------------------------------------------------------------*/
 696
 697 static void
 698 ehci_hub_descriptor (
 699         struct ehci_hcd                 *ehci,
 700         struct usb_hub_descriptor       *desc
 701 ) {
 702         int             ports = HCS_N_PORTS (ehci->hcs_params);
 703         u16             temp;
 704
 705         desc->bDescriptorType = USB_DT_HUB;
 706         desc->bPwrOn2PwrGood = 10;      /* ehci 1.0, 2.3.9 says 20ms max */
 707         desc->bHubContrCurrent = 0;
 708
 709         desc->bNbrPorts = ports;
 710         temp = 1 + (ports / 8);
 711         desc->bDescLength = 7 + 2 * temp;
 712
 713         /* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
 714         memset(&desc->u.hs.DeviceRemovable[0], 0, temp);
 715         memset(&desc->u.hs.DeviceRemovable[temp], 0xff, temp);
 716
 717         temp = HUB_CHAR_INDV_PORT_OCPM; /* per-port overcurrent reporting */
 718         if (HCS_PPC (ehci->hcs_params))
 719                 temp |= HUB_CHAR_INDV_PORT_LPSM; /* per-port power control */
 720         else
 721                 temp |= HUB_CHAR_NO_LPSM; /* no power switching */
 722 #if 0
 723 // re-enable when we support USB_PORT_FEAT_INDICATOR below.
 724         if (HCS_INDICATOR (ehci->hcs_params))
 725                 temp |= HUB_CHAR_PORTIND; /* per-port indicators (LEDs) */
 726 #endif
 727         desc->wHubCharacteristics = cpu_to_le16(temp);
 728 }
 729
 730 /*-------------------------------------------------------------------------*/
 731
 732 int ehci_hub_control(
 733         struct usb_hcd  *hcd,
 734         u16             typeReq,
 735         u16             wValue,
 736         u16             wIndex,
 737         char            *buf,
 738         u16             wLength
 739 ) {
 740         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 741         int             ports = HCS_N_PORTS (ehci->hcs_params);
 742         u32 __iomem     *status_reg, *hostpc_reg;
 743         u32             temp, temp1, status;
 744         unsigned long   flags;
 745         int             retval = 0;
 746         unsigned        selector;
 747
 748         /*
 749          * Avoid out-of-bounds values while calculating the port index
 750          * from wIndex.  The compiler doesn't like pointers to invalid
 751          * addresses, even if they are never used.
 752          */
 753         temp = (wIndex - 1) & 0xff;
 754         if (temp >= HCS_N_PORTS_MAX)
 755                 temp = 0;
 756         status_reg = &ehci->regs->port_status[temp];
 757         hostpc_reg = &ehci->regs->hostpc[temp];
 758
 759         /*
 760          * FIXME:  support SetPortFeatures USB_PORT_FEAT_INDICATOR.
 761          * HCS_INDICATOR may say we can change LEDs to off/amber/green.
 762          * (track current state ourselves) ... blink for diagnostics,
 763          * power, "this is the one", etc.  EHCI spec supports this.
 764          */
 765
 766         spin_lock_irqsave (&ehci->lock, flags);
 767         switch (typeReq) {
 768         case ClearHubFeature:
 769                 switch (wValue) {
 770                 case C_HUB_LOCAL_POWER:
 771                 case C_HUB_OVER_CURRENT:
 772                         /* no hub-wide feature/status flags */
 773                         break;
 774                 default:
 775                         goto error;
 776                 }
 777                 break;
 778         case ClearPortFeature:
 779                 if (!wIndex || wIndex > ports)
 780                         goto error;
 781                 wIndex--;
 782                 temp = ehci_readl(ehci, status_reg);
 783                 temp &= ~PORT_RWC_BITS;
 784
 785                 /*
 786                  * Even if OWNER is set, so the port is owned by the
 787                  * companion controller, hub_wq needs to be able to clear
 788                  * the port-change status bits (especially
 789                  * USB_PORT_STAT_C_CONNECTION).
 790                  */
 791
 792                 switch (wValue) {
 793                 case USB_PORT_FEAT_ENABLE:
 794                         ehci_writel(ehci, temp & ~PORT_PE, status_reg);
 795                         break;
 796                 case USB_PORT_FEAT_C_ENABLE:
 797                         ehci_writel(ehci, temp | PORT_PEC, status_reg);
 798                         break;
 799                 case USB_PORT_FEAT_SUSPEND:
 800                         if (temp & PORT_RESET)
 801                                 goto error;
 802                         if (ehci->no_selective_suspend)
 803                                 break;
 804 #ifdef CONFIG_USB_OTG
 805                         if ((hcd->self.otg_port == (wIndex + 1))
 806                             && hcd->self.b_hnp_enable) {
 807                                 otg_start_hnp(hcd->usb_phy->otg);
 808                                 break;
 809                         }
 810 #endif
 811                         if (!(temp & PORT_SUSPEND))
 812                                 break;
 813                         if ((temp & PORT_PE) == 0)
 814                                 goto error;
 815
 816                         /* clear phy low-power mode before resume */
 817                         if (ehci->has_tdi_phy_lpm) {
 818                                 temp1 = ehci_readl(ehci, hostpc_reg);
 819                                 ehci_writel(ehci, temp1 & ~HOSTPC_PHCD,
 820                                                 hostpc_reg);
 821                                 spin_unlock_irqrestore(&ehci->lock, flags);
 822                                 msleep(5);/* wait to leave low-power mode */
 823                                 spin_lock_irqsave(&ehci->lock, flags);
 824                         }
 825                         /* resume signaling for 20 msec */
 826                         temp &= ~PORT_WAKE_BITS;
 827                         ehci_writel(ehci, temp | PORT_RESUME, status_reg);
 828                         ehci->reset_done[wIndex] = jiffies
 829                                         + msecs_to_jiffies(USB_RESUME_TIMEOUT);
 830                         set_bit(wIndex, &ehci->resuming_ports);
 831                         usb_hcd_start_port_resume(&hcd->self, wIndex);
 832                         break;
 833                 case USB_PORT_FEAT_C_SUSPEND:
 834                         clear_bit(wIndex, &ehci->port_c_suspend);
 835                         break;
 836                 case USB_PORT_FEAT_POWER:
 837                         if (HCS_PPC(ehci->hcs_params)) {
 838                                 spin_unlock_irqrestore(&ehci->lock, flags);
 839                                 ehci_port_power(ehci, wIndex, false);
 840                                 spin_lock_irqsave(&ehci->lock, flags);
 841                         }
 842                         break;
 843                 case USB_PORT_FEAT_C_CONNECTION:
 844                         ehci_writel(ehci, temp | PORT_CSC, status_reg);
 845                         break;
 846                 case USB_PORT_FEAT_C_OVER_CURRENT:
 847                         ehci_writel(ehci, temp | PORT_OCC, status_reg);
 848                         break;
 849                 case USB_PORT_FEAT_C_RESET:
 850                         /* GetPortStatus clears reset */
 851                         break;
 852                 default:
 853                         goto error;
 854                 }
 855                 ehci_readl(ehci, &ehci->regs->command); /* unblock posted write */
 856                 break;
 857         case GetHubDescriptor:
 858                 ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
 859                         buf);
 860                 break;
 861         case GetHubStatus:
 862                 /* no hub-wide feature/status flags */
 863                 memset (buf, 0, 4);
 864                 //cpu_to_le32s ((u32 *) buf);
 865                 break;
 866         case GetPortStatus:
 867                 if (!wIndex || wIndex > ports)
 868                         goto error;
 869                 wIndex--;
 870                 status = 0;
 871                 temp = ehci_readl(ehci, status_reg);
 872
 873                 // wPortChange bits
 874                 if (temp & PORT_CSC)
 875                         status |= USB_PORT_STAT_C_CONNECTION << 16;
 876                 if (temp & PORT_PEC)
 877                         status |= USB_PORT_STAT_C_ENABLE << 16;
 878
 879                 if (ehci_has_ci_pec_bug(ehci, temp)) {
 880                         status |= USB_PORT_STAT_C_ENABLE << 16;
 881                         ehci_info(ehci,
 882                                 "PE is cleared by HW port:%d PORTSC:%08x\n",
 883                                 wIndex + 1, temp);
 884                 }
 885
 886                 if ((temp & PORT_OCC) && (!ignore_oc && !ehci->spurious_oc)){
 887                         status |= USB_PORT_STAT_C_OVERCURRENT << 16;
 888
 889                         /*
 890                          * Hubs should disable port power on over-current.
 891                          * However, not all EHCI implementations do this
 892                          * automatically, even if they _do_ support per-port
 893                          * power switching; they're allowed to just limit the
 894                          * current.  hub_wq will turn the power back on.
 895                          */
 896                         if (((temp & PORT_OC) || (ehci->need_oc_pp_cycle))
 897                                         && HCS_PPC(ehci->hcs_params)) {
 898                                 spin_unlock_irqrestore(&ehci->lock, flags);
 899                                 ehci_port_power(ehci, wIndex, false);
 900                                 spin_lock_irqsave(&ehci->lock, flags);
 901                                 temp = ehci_readl(ehci, status_reg);
 902                         }
 903                 }
 904
 905                 /* no reset or resume pending */
 906                 if (!ehci->reset_done[wIndex]) {
 907
 908                         /* Remote Wakeup received? */
 909                         if (temp & PORT_RESUME) {
 910                                 /* resume signaling for 20 msec */
 911                                 ehci->reset_done[wIndex] = jiffies
 912                                                 + msecs_to_jiffies(20);
 913                                 usb_hcd_start_port_resume(&hcd->self, wIndex);
 914                                 set_bit(wIndex, &ehci->resuming_ports);
 915                                 /* check the port again */
 916                                 mod_timer(&ehci_to_hcd(ehci)->rh_timer,
 917                                                 ehci->reset_done[wIndex]);
 918                         }
 919
 920                 /* reset or resume not yet complete */
 921                 } else if (!time_after_eq(jiffies, ehci->reset_done[wIndex])) {
 922                         ;       /* wait until it is complete */
 923
 924                 /* resume completed */
 925                 } else if (test_bit(wIndex, &ehci->resuming_ports)) {
 926                         clear_bit(wIndex, &ehci->suspended_ports);
 927                         set_bit(wIndex, &ehci->port_c_suspend);
 928                         ehci->reset_done[wIndex] = 0;
 929                         usb_hcd_end_port_resume(&hcd->self, wIndex);
 930
 931                         /* stop resume signaling */
 932                         temp &= ~(PORT_RWC_BITS | PORT_SUSPEND | PORT_RESUME);
 933                         ehci_writel(ehci, temp, status_reg);
 934                         clear_bit(wIndex, &ehci->resuming_ports);
 935                         retval = ehci_handshake(ehci, status_reg,
 936                                         PORT_RESUME, 0, 2000 /* 2msec */);
 937                         if (retval != 0) {
 938                                 ehci_err(ehci, "port %d resume error %d\n",
 939                                                 wIndex + 1, retval);
 940                                 goto error;
 941                         }
 942                         temp = ehci_readl(ehci, status_reg);
 943
 944                 /* whoever resets must GetPortStatus to complete it!! */
 945                 } else {
 946                         status |= USB_PORT_STAT_C_RESET << 16;
 947                         ehci->reset_done [wIndex] = 0;
 948
 949                         /* force reset to complete */
 950                         ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESET),
 951                                         status_reg);
 952                         /* REVISIT:  some hardware needs 550+ usec to clear
 953                          * this bit; seems too long to spin routinely...
 954                          */
 955                         retval = ehci_handshake(ehci, status_reg,
 956                                         PORT_RESET, 0, 1000);
 957                         if (retval != 0) {
 958                                 ehci_err (ehci, "port %d reset error %d\n",
 959                                         wIndex + 1, retval);
 960                                 goto error;
 961                         }
 962
 963                         /* see what we found out */
 964                         temp = check_reset_complete (ehci, wIndex, status_reg,
 965                                         ehci_readl(ehci, status_reg));
 966                 }
 967
 968                 /* transfer dedicated ports to the companion hc */
 969                 if ((temp & PORT_CONNECT) &&
 970                                 test_bit(wIndex, &ehci->companion_ports)) {
 971                         temp &= ~PORT_RWC_BITS;
 972                         temp |= PORT_OWNER;
 973                         ehci_writel(ehci, temp, status_reg);
 974                         ehci_dbg(ehci, "port %d --> companion\n", wIndex + 1);
 975                         temp = ehci_readl(ehci, status_reg);
 976                 }
 977
 978                 /*
 979                  * Even if OWNER is set, there's no harm letting hub_wq
 980                  * see the wPortStatus values (they should all be 0 except
 981                  * for PORT_POWER anyway).
 982                  */
 983
 984                 if (temp & PORT_CONNECT) {
 985                         status |= USB_PORT_STAT_CONNECTION;
 986                         // status may be from integrated TT
 987                         if (ehci->has_hostpc) {
 988                                 temp1 = ehci_readl(ehci, hostpc_reg);
 989                                 status |= ehci_port_speed(ehci, temp1);
 990                         } else
 991                                 status |= ehci_port_speed(ehci, temp);
 992                 }
 993                 if (temp & PORT_PE)
 994                         status |= USB_PORT_STAT_ENABLE;
 995
 996                 /* maybe the port was unsuspended without our knowledge */
 997                 if (temp & (PORT_SUSPEND|PORT_RESUME)) {
 998                         status |= USB_PORT_STAT_SUSPEND;
 999                 } else if (test_bit(wIndex, &ehci->suspended_ports)) {
1000                         clear_bit(wIndex, &ehci->suspended_ports);
1001                         clear_bit(wIndex, &ehci->resuming_ports);
1002                         ehci->reset_done[wIndex] = 0;
1003                         if (temp & PORT_PE)
1004                                 set_bit(wIndex, &ehci->port_c_suspend);
1005                         usb_hcd_end_port_resume(&hcd->self, wIndex);
1006                 }
1007
1008                 if (temp & PORT_OC)
1009                         status |= USB_PORT_STAT_OVERCURRENT;
1010                 if (temp & PORT_RESET)
1011                         status |= USB_PORT_STAT_RESET;
1012                 if (temp & PORT_POWER)
1013                         status |= USB_PORT_STAT_POWER;
1014                 if (test_bit(wIndex, &ehci->port_c_suspend))
1015                         status |= USB_PORT_STAT_C_SUSPEND << 16;
1016
1017                 if (status & ~0xffff)   /* only if wPortChange is interesting */
1018                         dbg_port(ehci, "GetStatus", wIndex + 1, temp);
1019                 put_unaligned_le32(status, buf);
1020                 break;
1021         case SetHubFeature:
1022                 switch (wValue) {
1023                 case C_HUB_LOCAL_POWER:
1024                 case C_HUB_OVER_CURRENT:
1025                         /* no hub-wide feature/status flags */
1026                         break;
1027                 default:
1028                         goto error;
1029                 }
1030                 break;
1031         case SetPortFeature:
1032                 selector = wIndex >> 8;
1033                 wIndex &= 0xff;
1034                 if (unlikely(ehci->debug)) {
1035                         /* If the debug port is active any port
1036                          * feature requests should get denied */
1037                         if (wIndex == HCS_DEBUG_PORT(ehci->hcs_params) &&
1038                             (readl(&ehci->debug->control) & DBGP_ENABLED)) {
1039                                 retval = -ENODEV;
1040                                 goto error_exit;
1041                         }
1042                 }
1043                 if (!wIndex || wIndex > ports)
1044                         goto error;
1045                 wIndex--;
1046                 temp = ehci_readl(ehci, status_reg);
1047                 if (temp & PORT_OWNER)
1048                         break;
1049
1050                 temp &= ~PORT_RWC_BITS;
1051                 switch (wValue) {
1052                 case USB_PORT_FEAT_SUSPEND:
1053                         if (ehci->no_selective_suspend)
1054                                 break;
1055                         if ((temp & PORT_PE) == 0
1056                                         || (temp & PORT_RESET) != 0)
1057                                 goto error;
1058
1059                         /* After above check the port must be connected.
1060                          * Set appropriate bit thus could put phy into low power
1061                          * mode if we have tdi_phy_lpm feature
1062                          */
1063                         temp &= ~PORT_WKCONN_E;
1064                         temp |= PORT_WKDISC_E | PORT_WKOC_E;
1065                         ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
1066                         if (ehci->has_tdi_phy_lpm) {
1067                                 spin_unlock_irqrestore(&ehci->lock, flags);
1068                                 msleep(5);/* 5ms for HCD enter low pwr mode */
1069                                 spin_lock_irqsave(&ehci->lock, flags);
1070                                 temp1 = ehci_readl(ehci, hostpc_reg);
1071                                 ehci_writel(ehci, temp1 | HOSTPC_PHCD,
1072                                         hostpc_reg);
1073                                 temp1 = ehci_readl(ehci, hostpc_reg);
1074                                 ehci_dbg(ehci, "Port%d phy low pwr mode %s\n",
1075                                         wIndex, (temp1 & HOSTPC_PHCD) ?
1076                                         "succeeded" : "failed");
1077                         }
1078                         if (ehci_has_fsl_susp_errata(ehci)) {
1079                                 /* 10ms for HCD enter suspend */
1080                                 spin_unlock_irqrestore(&ehci->lock, flags);
1081                                 usleep_range(10000, 20000);
1082                                 spin_lock_irqsave(&ehci->lock, flags);
1083                         }
1084                         set_bit(wIndex, &ehci->suspended_ports);
1085                         break;
1086                 case USB_PORT_FEAT_POWER:
1087                         if (HCS_PPC(ehci->hcs_params)) {
1088                                 spin_unlock_irqrestore(&ehci->lock, flags);
1089                                 ehci_port_power(ehci, wIndex, true);
1090                                 spin_lock_irqsave(&ehci->lock, flags);
1091                         }
1092                         break;
1093                 case USB_PORT_FEAT_RESET:
1094                         if (temp & (PORT_SUSPEND|PORT_RESUME))
1095                                 goto error;
1096                         /* line status bits may report this as low speed,
1097                          * which can be fine if this root hub has a
1098                          * transaction translator built in.
1099                          */
1100                         if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
1101                                         && !ehci_is_TDI(ehci)
1102                                         && PORT_USB11 (temp)) {
1103                                 ehci_dbg (ehci,
1104                                         "port %d low speed --> companion\n",
1105                                         wIndex + 1);
1106                                 temp |= PORT_OWNER;
1107                         } else {
1108                                 temp |= PORT_RESET;
1109                                 temp &= ~PORT_PE;
1110
1111                                 /*
1112                                  * caller must wait, then call GetPortStatus
1113                                  * usb 2.0 spec says 50 ms resets on root
1114                                  */
1115                                 ehci->reset_done [wIndex] = jiffies
1116                                                 + msecs_to_jiffies (50);
1117
1118                                 /*
1119                                  * Force full-speed connect for FSL high-speed
1120                                  * erratum; disable HS Chirp by setting PFSC bit
1121                                  */
1122                                 if (ehci_has_fsl_hs_errata(ehci))
1123                                         temp |= (1 << PORTSC_FSL_PFSC);
1124                         }
1125                         ehci_writel(ehci, temp, status_reg);
1126                         break;
1127
1128                 /* For downstream facing ports (these):  one hub port is put
1129                  * into test mode according to USB2 11.24.2.13, then the hub
1130                  * must be reset (which for root hub now means rmmod+modprobe,
1131                  * or else system reboot).  See EHCI 2.3.9 and 4.14 for info
1132                  * about the EHCI-specific stuff.
1133                  */
1134                 case USB_PORT_FEAT_TEST:
1135 #ifdef CONFIG_USB_HCD_TEST_MODE
1136                         if (selector == EHSET_TEST_SINGLE_STEP_SET_FEATURE) {
1137                                 spin_unlock_irqrestore(&ehci->lock, flags);
1138                                 retval = ehset_single_step_set_feature(hcd,
1139                                                                 wIndex + 1);
1140                                 spin_lock_irqsave(&ehci->lock, flags);
1141                                 break;
1142                         }
1143 #endif
1144                         if (!selector || selector > 5)
1145                                 goto error;
1146                         spin_unlock_irqrestore(&ehci->lock, flags);
1147                         ehci_quiesce(ehci);
1148                         spin_lock_irqsave(&ehci->lock, flags);
1149
1150                         /* Put all enabled ports into suspend */
1151                         while (ports--) {
1152                                 u32 __iomem *sreg =
1153                                                 &ehci->regs->port_status[ports];
1154
1155                                 temp = ehci_readl(ehci, sreg) & ~PORT_RWC_BITS;
1156                                 if (temp & PORT_PE)
1157                                         ehci_writel(ehci, temp | PORT_SUSPEND,
1158                                                         sreg);
1159                         }
1160
1161                         spin_unlock_irqrestore(&ehci->lock, flags);
1162                         ehci_halt(ehci);
1163                         spin_lock_irqsave(&ehci->lock, flags);
1164
1165                         temp = ehci_readl(ehci, status_reg);
1166                         temp |= selector << 16;
1167                         ehci_writel(ehci, temp, status_reg);
1168                         break;
1169
1170                 default:
1171                         goto error;
1172                 }
1173                 ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
1174                 break;
1175
1176         default:
1177 error:
1178                 /* "stall" on error */
1179                 retval = -EPIPE;
1180         }
1181 error_exit:
1182         spin_unlock_irqrestore (&ehci->lock, flags);
1183         return retval;
1184 }
1185 EXPORT_SYMBOL_GPL(ehci_hub_control);
1186
1187 static void ehci_relinquish_port(struct usb_hcd *hcd, int portnum)
1188 {
1189         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1190
1191         if (ehci_is_TDI(ehci))
1192                 return;
1193         set_owner(ehci, --portnum, PORT_OWNER);
1194 }
1195
1196 static int ehci_port_handed_over(struct usb_hcd *hcd, int portnum)
1197 {
1198         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1199         u32 __iomem             *reg;
1200
1201         if (ehci_is_TDI(ehci))
1202                 return 0;
1203         reg = &ehci->regs->port_status[portnum - 1];
1204         return ehci_readl(ehci, reg) & PORT_OWNER;
1205 }
1206
1207 static int ehci_port_power(struct ehci_hcd *ehci, int portnum, bool enable)
1208 {
1209         struct usb_hcd *hcd = ehci_to_hcd(ehci);
1210         u32 __iomem *status_reg = &ehci->regs->port_status[portnum];
1211         u32 temp = ehci_readl(ehci, status_reg) & ~PORT_RWC_BITS;
1212
1213         if (enable)
1214                 ehci_writel(ehci, temp | PORT_POWER, status_reg);
1215         else
1216                 ehci_writel(ehci, temp & ~PORT_POWER, status_reg);
1217
1218         if (hcd->driver->port_power)
1219                 hcd->driver->port_power(hcd, portnum, enable);
1220
1221         return 0;
1222 }