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         /* Any IAA cycle that started before the suspend is now invalid */
 349         end_iaa_cycle(ehci);
 350         ehci_handle_start_intr_unlinks(ehci);
 351         ehci_handle_intr_unlinks(ehci);
 352         end_free_itds(ehci);
 353
 354         /* allow remote wakeup */
 355         mask = INTR_MASK;
 356         if (!hcd->self.root_hub->do_remote_wakeup)
 357                 mask &= ~STS_PCD;
 358         ehci_writel(ehci, mask, &ehci->regs->intr_enable);
 359         ehci_readl(ehci, &ehci->regs->intr_enable);
 360
 361  done:
 362         ehci->next_statechange = jiffies + msecs_to_jiffies(10);
 363         ehci->enabled_hrtimer_events = 0;
 364         ehci->next_hrtimer_event = EHCI_HRTIMER_NO_EVENT;
 365         spin_unlock_irq (&ehci->lock);
 366
 367         hrtimer_cancel(&ehci->hrtimer);
 368         return 0;
 369 }
 370
 371
 372 /* caller has locked the root hub, and should reset/reinit on error */
 373 static int ehci_bus_resume (struct usb_hcd *hcd)
 374 {
 375         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 376         u32                     temp;
 377         u32                     power_okay;
 378         int                     i;
 379         unsigned long           resume_needed = 0;
 380
 381         if (time_before (jiffies, ehci->next_statechange))
 382                 msleep(5);
 383         spin_lock_irq (&ehci->lock);
 384         if (!HCD_HW_ACCESSIBLE(hcd) || ehci->shutdown)
 385                 goto shutdown;
 386
 387         if (unlikely(ehci->debug)) {
 388                 if (!dbgp_reset_prep(hcd))
 389                         ehci->debug = NULL;
 390                 else
 391                         dbgp_external_startup(hcd);
 392         }
 393
 394         /* Ideally and we've got a real resume here, and no port's power
 395          * was lost.  (For PCI, that means Vaux was maintained.)  But we
 396          * could instead be restoring a swsusp snapshot -- so that BIOS was
 397          * the last user of the controller, not reset/pm hardware keeping
 398          * state we gave to it.
 399          */
 400         power_okay = ehci_readl(ehci, &ehci->regs->intr_enable);
 401         ehci_dbg(ehci, "resume root hub%s\n",
 402                         power_okay ? "" : " after power loss");
 403
 404         /* at least some APM implementations will try to deliver
 405          * IRQs right away, so delay them until we're ready.
 406          */
 407         ehci_writel(ehci, 0, &ehci->regs->intr_enable);
 408
 409         /* re-init operational registers */
 410         ehci_writel(ehci, 0, &ehci->regs->segment);
 411         ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
 412         ehci_writel(ehci, (u32) ehci->async->qh_dma, &ehci->regs->async_next);
 413
 414         /* restore CMD_RUN, framelist size, and irq threshold */
 415         ehci->command |= CMD_RUN;
 416         ehci_writel(ehci, ehci->command, &ehci->regs->command);
 417         ehci->rh_state = EHCI_RH_RUNNING;
 418
 419         /*
 420          * According to Bugzilla #8190, the port status for some controllers
 421          * will be wrong without a delay. At their wrong status, the port
 422          * is enabled, but not suspended neither resumed.
 423          */
 424         i = HCS_N_PORTS(ehci->hcs_params);
 425         while (i--) {
 426                 temp = ehci_readl(ehci, &ehci->regs->port_status[i]);
 427                 if ((temp & PORT_PE) &&
 428                                 !(temp & (PORT_SUSPEND | PORT_RESUME))) {
 429                         ehci_dbg(ehci, "Port status(0x%x) is wrong\n", temp);
 430                         spin_unlock_irq(&ehci->lock);
 431                         msleep(8);
 432                         spin_lock_irq(&ehci->lock);
 433                         break;
 434                 }
 435         }
 436
 437         if (ehci->shutdown)
 438                 goto shutdown;
 439
 440         /* clear phy low-power mode before resume */
 441         if (ehci->bus_suspended && ehci->has_tdi_phy_lpm) {
 442                 i = HCS_N_PORTS(ehci->hcs_params);
 443                 while (i--) {
 444                         if (test_bit(i, &ehci->bus_suspended)) {
 445                                 u32 __iomem     *hostpc_reg =
 446                                                         &ehci->regs->hostpc[i];
 447
 448                                 temp = ehci_readl(ehci, hostpc_reg);
 449                                 ehci_writel(ehci, temp & ~HOSTPC_PHCD,
 450                                                 hostpc_reg);
 451                         }
 452                 }
 453                 spin_unlock_irq(&ehci->lock);
 454                 msleep(5);
 455                 spin_lock_irq(&ehci->lock);
 456                 if (ehci->shutdown)
 457                         goto shutdown;
 458         }
 459
 460         /* manually resume the ports we suspended during bus_suspend() */
 461         i = HCS_N_PORTS (ehci->hcs_params);
 462         while (i--) {
 463                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 464                 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
 465                 if (test_bit(i, &ehci->bus_suspended) &&
 466                                 (temp & PORT_SUSPEND)) {
 467                         temp |= PORT_RESUME;
 468                         set_bit(i, &resume_needed);
 469                 }
 470                 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
 471         }
 472
 473         /*
 474          * msleep for USB_RESUME_TIMEOUT ms only if code is trying to resume
 475          * port
 476          */
 477         if (resume_needed) {
 478                 spin_unlock_irq(&ehci->lock);
 479                 msleep(USB_RESUME_TIMEOUT);
 480                 spin_lock_irq(&ehci->lock);
 481                 if (ehci->shutdown)
 482                         goto shutdown;
 483         }
 484
 485         i = HCS_N_PORTS (ehci->hcs_params);
 486         while (i--) {
 487                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 488                 if (test_bit(i, &resume_needed)) {
 489                         temp &= ~(PORT_RWC_BITS | PORT_SUSPEND | PORT_RESUME);
 490                         ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
 491                 }
 492         }
 493
 494         ehci->next_statechange = jiffies + msecs_to_jiffies(5);
 495         spin_unlock_irq(&ehci->lock);
 496
 497         ehci_handover_companion_ports(ehci);
 498
 499         /* Now we can safely re-enable irqs */
 500         spin_lock_irq(&ehci->lock);
 501         if (ehci->shutdown)
 502                 goto shutdown;
 503         ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
 504         (void) ehci_readl(ehci, &ehci->regs->intr_enable);
 505         spin_unlock_irq(&ehci->lock);
 506
 507         return 0;
 508
 509  shutdown:
 510         spin_unlock_irq(&ehci->lock);
 511         return -ESHUTDOWN;
 512 }
 513
 514 static unsigned long ehci_get_resuming_ports(struct usb_hcd *hcd)
 515 {
 516         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
 517
 518         return ehci->resuming_ports;
 519 }
 520
 521 #else
 522
 523 #define ehci_bus_suspend        NULL
 524 #define ehci_bus_resume         NULL
 525 #define ehci_get_resuming_ports NULL
 526
 527 #endif  /* CONFIG_PM */
 528
 529 /*-------------------------------------------------------------------------*/
 530
 531 /*
 532  * Sets the owner of a port
 533  */
 534 static void set_owner(struct ehci_hcd *ehci, int portnum, int new_owner)
 535 {
 536         u32 __iomem             *status_reg;
 537         u32                     port_status;
 538         int                     try;
 539
 540         status_reg = &ehci->regs->port_status[portnum];
 541
 542         /*
 543          * The controller won't set the OWNER bit if the port is
 544          * enabled, so this loop will sometimes require at least two
 545          * iterations: one to disable the port and one to set OWNER.
 546          */
 547         for (try = 4; try > 0; --try) {
 548                 spin_lock_irq(&ehci->lock);
 549                 port_status = ehci_readl(ehci, status_reg);
 550                 if ((port_status & PORT_OWNER) == new_owner
 551                                 || (port_status & (PORT_OWNER | PORT_CONNECT))
 552                                         == 0)
 553                         try = 0;
 554                 else {
 555                         port_status ^= PORT_OWNER;
 556                         port_status &= ~(PORT_PE | PORT_RWC_BITS);
 557                         ehci_writel(ehci, port_status, status_reg);
 558                 }
 559                 spin_unlock_irq(&ehci->lock);
 560                 if (try > 1)
 561                         msleep(5);
 562         }
 563 }
 564
 565 /*-------------------------------------------------------------------------*/
 566
 567 static int check_reset_complete (
 568         struct ehci_hcd *ehci,
 569         int             index,
 570         u32 __iomem     *status_reg,
 571         int             port_status
 572 ) {
 573         if (!(port_status & PORT_CONNECT))
 574                 return port_status;
 575
 576         /* if reset finished and it's still not enabled -- handoff */
 577         if (!(port_status & PORT_PE)) {
 578
 579                 /* with integrated TT, there's nobody to hand it to! */
 580                 if (ehci_is_TDI(ehci)) {
 581                         ehci_dbg (ehci,
 582                                 "Failed to enable port %d on root hub TT\n",
 583                                 index+1);
 584                         return port_status;
 585                 }
 586
 587                 ehci_dbg (ehci, "port %d full speed --> companion\n",
 588                         index + 1);
 589
 590                 // what happens if HCS_N_CC(params) == 0 ?
 591                 port_status |= PORT_OWNER;
 592                 port_status &= ~PORT_RWC_BITS;
 593                 ehci_writel(ehci, port_status, status_reg);
 594
 595                 /* ensure 440EPX ohci controller state is operational */
 596                 if (ehci->has_amcc_usb23)
 597                         set_ohci_hcfs(ehci, 1);
 598         } else {
 599                 ehci_dbg(ehci, "port %d reset complete, port enabled\n",
 600                         index + 1);
 601                 /* ensure 440EPx ohci controller state is suspended */
 602                 if (ehci->has_amcc_usb23)
 603                         set_ohci_hcfs(ehci, 0);
 604         }
 605
 606         return port_status;
 607 }
 608
 609 /*-------------------------------------------------------------------------*/
 610
 611
 612 /* build "status change" packet (one or two bytes) from HC registers */
 613
 614 static int
 615 ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
 616 {
 617         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 618         u32             temp, status;
 619         u32             mask;
 620         int             ports, i, retval = 1;
 621         unsigned long   flags;
 622         u32             ppcd = ~0;
 623
 624         /* init status to no-changes */
 625         buf [0] = 0;
 626         ports = HCS_N_PORTS (ehci->hcs_params);
 627         if (ports > 7) {
 628                 buf [1] = 0;
 629                 retval++;
 630         }
 631
 632         /* Inform the core about resumes-in-progress by returning
 633          * a non-zero value even if there are no status changes.
 634          */
 635         status = ehci->resuming_ports;
 636
 637         /* Some boards (mostly VIA?) report bogus overcurrent indications,
 638          * causing massive log spam unless we completely ignore them.  It
 639          * may be relevant that VIA VT8235 controllers, where PORT_POWER is
 640          * always set, seem to clear PORT_OCC and PORT_CSC when writing to
 641          * PORT_POWER; that's surprising, but maybe within-spec.
 642          */
 643         if (!ignore_oc)
 644                 mask = PORT_CSC | PORT_PEC | PORT_OCC;
 645         else
 646                 mask = PORT_CSC | PORT_PEC;
 647         // PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
 648
 649         /* no hub change reports (bit 0) for now (power, ...) */
 650
 651         /* port N changes (bit N)? */
 652         spin_lock_irqsave (&ehci->lock, flags);
 653
 654         /* get per-port change detect bits */
 655         if (ehci->has_ppcd)
 656                 ppcd = ehci_readl(ehci, &ehci->regs->status) >> 16;
 657
 658         for (i = 0; i < ports; i++) {
 659                 /* leverage per-port change bits feature */
 660                 if (ppcd & (1 << i))
 661                         temp = ehci_readl(ehci, &ehci->regs->port_status[i]);
 662                 else
 663                         temp = 0;
 664
 665                 /*
 666                  * Return status information even for ports with OWNER set.
 667                  * Otherwise hub_wq wouldn't see the disconnect event when a
 668                  * high-speed device is switched over to the companion
 669                  * controller by the user.
 670                  */
 671
 672                 if ((temp & mask) != 0 || test_bit(i, &ehci->port_c_suspend)
 673                                 || (ehci->reset_done[i] && time_after_eq(
 674                                         jiffies, ehci->reset_done[i]))) {
 675                         if (i < 7)
 676                             buf [0] |= 1 << (i + 1);
 677                         else
 678                             buf [1] |= 1 << (i - 7);
 679                         status = STS_PCD;
 680                 }
 681         }
 682
 683         /* If a resume is in progress, make sure it can finish */
 684         if (ehci->resuming_ports)
 685                 mod_timer(&hcd->rh_timer, jiffies + msecs_to_jiffies(25));
 686
 687         spin_unlock_irqrestore (&ehci->lock, flags);
 688         return status ? retval : 0;
 689 }
 690
 691 /*-------------------------------------------------------------------------*/
 692
 693 static void
 694 ehci_hub_descriptor (
 695         struct ehci_hcd                 *ehci,
 696         struct usb_hub_descriptor       *desc
 697 ) {
 698         int             ports = HCS_N_PORTS (ehci->hcs_params);
 699         u16             temp;
 700
 701         desc->bDescriptorType = USB_DT_HUB;
 702         desc->bPwrOn2PwrGood = 10;      /* ehci 1.0, 2.3.9 says 20ms max */
 703         desc->bHubContrCurrent = 0;
 704
 705         desc->bNbrPorts = ports;
 706         temp = 1 + (ports / 8);
 707         desc->bDescLength = 7 + 2 * temp;
 708
 709         /* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
 710         memset(&desc->u.hs.DeviceRemovable[0], 0, temp);
 711         memset(&desc->u.hs.DeviceRemovable[temp], 0xff, temp);
 712
 713         temp = HUB_CHAR_INDV_PORT_OCPM; /* per-port overcurrent reporting */
 714         if (HCS_PPC (ehci->hcs_params))
 715                 temp |= HUB_CHAR_INDV_PORT_LPSM; /* per-port power control */
 716         else
 717                 temp |= HUB_CHAR_NO_LPSM; /* no power switching */
 718 #if 0
 719 // re-enable when we support USB_PORT_FEAT_INDICATOR below.
 720         if (HCS_INDICATOR (ehci->hcs_params))
 721                 temp |= HUB_CHAR_PORTIND; /* per-port indicators (LEDs) */
 722 #endif
 723         desc->wHubCharacteristics = cpu_to_le16(temp);
 724 }
 725
 726 /*-------------------------------------------------------------------------*/
 727 #ifdef CONFIG_USB_HCD_TEST_MODE
 728
 729 #define EHSET_TEST_SINGLE_STEP_SET_FEATURE 0x06
 730
 731 static void usb_ehset_completion(struct urb *urb)
 732 {
 733         struct completion  *done = urb->context;
 734
 735         complete(done);
 736 }
 737 static int submit_single_step_set_feature(
 738         struct usb_hcd  *hcd,
 739         struct urb      *urb,
 740         int             is_setup
 741 );
 742
 743 /*
 744  * Allocate and initialize a control URB. This request will be used by the
 745  * EHSET SINGLE_STEP_SET_FEATURE test in which the DATA and STATUS stages
 746  * of the GetDescriptor request are sent 15 seconds after the SETUP stage.
 747  * Return NULL if failed.
 748  */
 749 static struct urb *request_single_step_set_feature_urb(
 750         struct usb_device       *udev,
 751         void                    *dr,
 752         void                    *buf,
 753         struct completion       *done
 754 ) {
 755         struct urb *urb;
 756         struct usb_hcd *hcd = bus_to_hcd(udev->bus);
 757         struct usb_host_endpoint *ep;
 758
 759         urb = usb_alloc_urb(0, GFP_KERNEL);
 760         if (!urb)
 761                 return NULL;
 762
 763         urb->pipe = usb_rcvctrlpipe(udev, 0);
 764         ep = (usb_pipein(urb->pipe) ? udev->ep_in : udev->ep_out)
 765                                 [usb_pipeendpoint(urb->pipe)];
 766         if (!ep) {
 767                 usb_free_urb(urb);
 768                 return NULL;
 769         }
 770
 771         urb->ep = ep;
 772         urb->dev = udev;
 773         urb->setup_packet = (void *)dr;
 774         urb->transfer_buffer = buf;
 775         urb->transfer_buffer_length = USB_DT_DEVICE_SIZE;
 776         urb->complete = usb_ehset_completion;
 777         urb->status = -EINPROGRESS;
 778         urb->actual_length = 0;
 779         urb->transfer_flags = URB_DIR_IN;
 780         usb_get_urb(urb);
 781         atomic_inc(&urb->use_count);
 782         atomic_inc(&urb->dev->urbnum);
 783         urb->setup_dma = dma_map_single(
 784                         hcd->self.sysdev,
 785                         urb->setup_packet,
 786                         sizeof(struct usb_ctrlrequest),
 787                         DMA_TO_DEVICE);
 788         urb->transfer_dma = dma_map_single(
 789                         hcd->self.sysdev,
 790                         urb->transfer_buffer,
 791                         urb->transfer_buffer_length,
 792                         DMA_FROM_DEVICE);
 793         urb->context = done;
 794         return urb;
 795 }
 796
 797 static int ehset_single_step_set_feature(struct usb_hcd *hcd, int port)
 798 {
 799         int retval = -ENOMEM;
 800         struct usb_ctrlrequest *dr;
 801         struct urb *urb;
 802         struct usb_device *udev;
 803         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 804         struct usb_device_descriptor *buf;
 805         DECLARE_COMPLETION_ONSTACK(done);
 806
 807         /* Obtain udev of the rhub's child port */
 808         udev = usb_hub_find_child(hcd->self.root_hub, port);
 809         if (!udev) {
 810                 ehci_err(ehci, "No device attached to the RootHub\n");
 811                 return -ENODEV;
 812         }
 813         buf = kmalloc(USB_DT_DEVICE_SIZE, GFP_KERNEL);
 814         if (!buf)
 815                 return -ENOMEM;
 816
 817         dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
 818         if (!dr) {
 819                 kfree(buf);
 820                 return -ENOMEM;
 821         }
 822
 823         /* Fill Setup packet for GetDescriptor */
 824         dr->bRequestType = USB_DIR_IN;
 825         dr->bRequest = USB_REQ_GET_DESCRIPTOR;
 826         dr->wValue = cpu_to_le16(USB_DT_DEVICE << 8);
 827         dr->wIndex = 0;
 828         dr->wLength = cpu_to_le16(USB_DT_DEVICE_SIZE);
 829         urb = request_single_step_set_feature_urb(udev, dr, buf, &done);
 830         if (!urb)
 831                 goto cleanup;
 832
 833         /* Submit just the SETUP stage */
 834         retval = submit_single_step_set_feature(hcd, urb, 1);
 835         if (retval)
 836                 goto out1;
 837         if (!wait_for_completion_timeout(&done, msecs_to_jiffies(2000))) {
 838                 usb_kill_urb(urb);
 839                 retval = -ETIMEDOUT;
 840                 ehci_err(ehci, "%s SETUP stage timed out on ep0\n", __func__);
 841                 goto out1;
 842         }
 843         msleep(15 * 1000);
 844
 845         /* Complete remaining DATA and STATUS stages using the same URB */
 846         urb->status = -EINPROGRESS;
 847         usb_get_urb(urb);
 848         atomic_inc(&urb->use_count);
 849         atomic_inc(&urb->dev->urbnum);
 850         retval = submit_single_step_set_feature(hcd, urb, 0);
 851         if (!retval && !wait_for_completion_timeout(&done,
 852                                                 msecs_to_jiffies(2000))) {
 853                 usb_kill_urb(urb);
 854                 retval = -ETIMEDOUT;
 855                 ehci_err(ehci, "%s IN stage timed out on ep0\n", __func__);
 856         }
 857 out1:
 858         usb_free_urb(urb);
 859 cleanup:
 860         kfree(dr);
 861         kfree(buf);
 862         return retval;
 863 }
 864 #endif /* CONFIG_USB_HCD_TEST_MODE */
 865 /*-------------------------------------------------------------------------*/
 866
 867 int ehci_hub_control(
 868         struct usb_hcd  *hcd,
 869         u16             typeReq,
 870         u16             wValue,
 871         u16             wIndex,
 872         char            *buf,
 873         u16             wLength
 874 ) {
 875         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 876         int             ports = HCS_N_PORTS (ehci->hcs_params);
 877         u32 __iomem     *status_reg, *hostpc_reg;
 878         u32             temp, temp1, status;
 879         unsigned long   flags;
 880         int             retval = 0;
 881         unsigned        selector;
 882
 883         /*
 884          * Avoid underflow while calculating (wIndex & 0xff) - 1.
 885          * The compiler might deduce that wIndex can never be 0 and then
 886          * optimize away the tests for !wIndex below.
 887          */
 888         temp = wIndex & 0xff;
 889         temp -= (temp > 0);
 890         status_reg = &ehci->regs->port_status[temp];
 891         hostpc_reg = &ehci->regs->hostpc[temp];
 892
 893         /*
 894          * FIXME:  support SetPortFeatures USB_PORT_FEAT_INDICATOR.
 895          * HCS_INDICATOR may say we can change LEDs to off/amber/green.
 896          * (track current state ourselves) ... blink for diagnostics,
 897          * power, "this is the one", etc.  EHCI spec supports this.
 898          */
 899
 900         spin_lock_irqsave (&ehci->lock, flags);
 901         switch (typeReq) {
 902         case ClearHubFeature:
 903                 switch (wValue) {
 904                 case C_HUB_LOCAL_POWER:
 905                 case C_HUB_OVER_CURRENT:
 906                         /* no hub-wide feature/status flags */
 907                         break;
 908                 default:
 909                         goto error;
 910                 }
 911                 break;
 912         case ClearPortFeature:
 913                 if (!wIndex || wIndex > ports)
 914                         goto error;
 915                 wIndex--;
 916                 temp = ehci_readl(ehci, status_reg);
 917                 temp &= ~PORT_RWC_BITS;
 918
 919                 /*
 920                  * Even if OWNER is set, so the port is owned by the
 921                  * companion controller, hub_wq needs to be able to clear
 922                  * the port-change status bits (especially
 923                  * USB_PORT_STAT_C_CONNECTION).
 924                  */
 925
 926                 switch (wValue) {
 927                 case USB_PORT_FEAT_ENABLE:
 928                         ehci_writel(ehci, temp & ~PORT_PE, status_reg);
 929                         break;
 930                 case USB_PORT_FEAT_C_ENABLE:
 931                         ehci_writel(ehci, temp | PORT_PEC, status_reg);
 932                         break;
 933                 case USB_PORT_FEAT_SUSPEND:
 934                         if (temp & PORT_RESET)
 935                                 goto error;
 936                         if (ehci->no_selective_suspend)
 937                                 break;
 938 #ifdef CONFIG_USB_OTG
 939                         if ((hcd->self.otg_port == (wIndex + 1))
 940                             && hcd->self.b_hnp_enable) {
 941                                 otg_start_hnp(hcd->usb_phy->otg);
 942                                 break;
 943                         }
 944 #endif
 945                         if (!(temp & PORT_SUSPEND))
 946                                 break;
 947                         if ((temp & PORT_PE) == 0)
 948                                 goto error;
 949
 950                         /* clear phy low-power mode before resume */
 951                         if (ehci->has_tdi_phy_lpm) {
 952                                 temp1 = ehci_readl(ehci, hostpc_reg);
 953                                 ehci_writel(ehci, temp1 & ~HOSTPC_PHCD,
 954                                                 hostpc_reg);
 955                                 spin_unlock_irqrestore(&ehci->lock, flags);
 956                                 msleep(5);/* wait to leave low-power mode */
 957                                 spin_lock_irqsave(&ehci->lock, flags);
 958                         }
 959                         /* resume signaling for 20 msec */
 960                         temp &= ~PORT_WAKE_BITS;
 961                         ehci_writel(ehci, temp | PORT_RESUME, status_reg);
 962                         ehci->reset_done[wIndex] = jiffies
 963                                         + msecs_to_jiffies(USB_RESUME_TIMEOUT);
 964                         set_bit(wIndex, &ehci->resuming_ports);
 965                         usb_hcd_start_port_resume(&hcd->self, wIndex);
 966                         break;
 967                 case USB_PORT_FEAT_C_SUSPEND:
 968                         clear_bit(wIndex, &ehci->port_c_suspend);
 969                         break;
 970                 case USB_PORT_FEAT_POWER:
 971                         if (HCS_PPC(ehci->hcs_params)) {
 972                                 spin_unlock_irqrestore(&ehci->lock, flags);
 973                                 ehci_port_power(ehci, wIndex, false);
 974                                 spin_lock_irqsave(&ehci->lock, flags);
 975                         }
 976                         break;
 977                 case USB_PORT_FEAT_C_CONNECTION:
 978                         ehci_writel(ehci, temp | PORT_CSC, status_reg);
 979                         break;
 980                 case USB_PORT_FEAT_C_OVER_CURRENT:
 981                         ehci_writel(ehci, temp | PORT_OCC, status_reg);
 982                         break;
 983                 case USB_PORT_FEAT_C_RESET:
 984                         /* GetPortStatus clears reset */
 985                         break;
 986                 default:
 987                         goto error;
 988                 }
 989                 ehci_readl(ehci, &ehci->regs->command); /* unblock posted write */
 990                 break;
 991         case GetHubDescriptor:
 992                 ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
 993                         buf);
 994                 break;
 995         case GetHubStatus:
 996                 /* no hub-wide feature/status flags */
 997                 memset (buf, 0, 4);
 998                 //cpu_to_le32s ((u32 *) buf);
 999                 break;
1000         case GetPortStatus:
1001                 if (!wIndex || wIndex > ports)
1002                         goto error;
1003                 wIndex--;
1004                 status = 0;
1005                 temp = ehci_readl(ehci, status_reg);
1006
1007                 // wPortChange bits
1008                 if (temp & PORT_CSC)
1009                         status |= USB_PORT_STAT_C_CONNECTION << 16;
1010                 if (temp & PORT_PEC)
1011                         status |= USB_PORT_STAT_C_ENABLE << 16;
1012
1013                 if ((temp & PORT_OCC) && !ignore_oc){
1014                         status |= USB_PORT_STAT_C_OVERCURRENT << 16;
1015
1016                         /*
1017                          * Hubs should disable port power on over-current.
1018                          * However, not all EHCI implementations do this
1019                          * automatically, even if they _do_ support per-port
1020                          * power switching; they're allowed to just limit the
1021                          * current.  hub_wq will turn the power back on.
1022                          */
1023                         if (((temp & PORT_OC) || (ehci->need_oc_pp_cycle))
1024                                         && HCS_PPC(ehci->hcs_params)) {
1025                                 spin_unlock_irqrestore(&ehci->lock, flags);
1026                                 ehci_port_power(ehci, wIndex, false);
1027                                 spin_lock_irqsave(&ehci->lock, flags);
1028                                 temp = ehci_readl(ehci, status_reg);
1029                         }
1030                 }
1031
1032                 /* no reset or resume pending */
1033                 if (!ehci->reset_done[wIndex]) {
1034
1035                         /* Remote Wakeup received? */
1036                         if (temp & PORT_RESUME) {
1037                                 /* resume signaling for 20 msec */
1038                                 ehci->reset_done[wIndex] = jiffies
1039                                                 + msecs_to_jiffies(20);
1040                                 usb_hcd_start_port_resume(&hcd->self, wIndex);
1041                                 set_bit(wIndex, &ehci->resuming_ports);
1042                                 /* check the port again */
1043                                 mod_timer(&ehci_to_hcd(ehci)->rh_timer,
1044                                                 ehci->reset_done[wIndex]);
1045                         }
1046
1047                 /* reset or resume not yet complete */
1048                 } else if (!time_after_eq(jiffies, ehci->reset_done[wIndex])) {
1049                         ;       /* wait until it is complete */
1050
1051                 /* resume completed */
1052                 } else if (test_bit(wIndex, &ehci->resuming_ports)) {
1053                         clear_bit(wIndex, &ehci->suspended_ports);
1054                         set_bit(wIndex, &ehci->port_c_suspend);
1055                         ehci->reset_done[wIndex] = 0;
1056                         usb_hcd_end_port_resume(&hcd->self, wIndex);
1057
1058                         /* stop resume signaling */
1059                         temp &= ~(PORT_RWC_BITS | PORT_SUSPEND | PORT_RESUME);
1060                         ehci_writel(ehci, temp, status_reg);
1061                         clear_bit(wIndex, &ehci->resuming_ports);
1062                         retval = ehci_handshake(ehci, status_reg,
1063                                         PORT_RESUME, 0, 2000 /* 2msec */);
1064                         if (retval != 0) {
1065                                 ehci_err(ehci, "port %d resume error %d\n",
1066                                                 wIndex + 1, retval);
1067                                 goto error;
1068                         }
1069                         temp = ehci_readl(ehci, status_reg);
1070
1071                 /* whoever resets must GetPortStatus to complete it!! */
1072                 } else {
1073                         status |= USB_PORT_STAT_C_RESET << 16;
1074                         ehci->reset_done [wIndex] = 0;
1075
1076                         /* force reset to complete */
1077                         ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESET),
1078                                         status_reg);
1079                         /* REVISIT:  some hardware needs 550+ usec to clear
1080                          * this bit; seems too long to spin routinely...
1081                          */
1082                         retval = ehci_handshake(ehci, status_reg,
1083                                         PORT_RESET, 0, 1000);
1084                         if (retval != 0) {
1085                                 ehci_err (ehci, "port %d reset error %d\n",
1086                                         wIndex + 1, retval);
1087                                 goto error;
1088                         }
1089
1090                         /* see what we found out */
1091                         temp = check_reset_complete (ehci, wIndex, status_reg,
1092                                         ehci_readl(ehci, status_reg));
1093                 }
1094
1095                 /* transfer dedicated ports to the companion hc */
1096                 if ((temp & PORT_CONNECT) &&
1097                                 test_bit(wIndex, &ehci->companion_ports)) {
1098                         temp &= ~PORT_RWC_BITS;
1099                         temp |= PORT_OWNER;
1100                         ehci_writel(ehci, temp, status_reg);
1101                         ehci_dbg(ehci, "port %d --> companion\n", wIndex + 1);
1102                         temp = ehci_readl(ehci, status_reg);
1103                 }
1104
1105                 /*
1106                  * Even if OWNER is set, there's no harm letting hub_wq
1107                  * see the wPortStatus values (they should all be 0 except
1108                  * for PORT_POWER anyway).
1109                  */
1110
1111                 if (temp & PORT_CONNECT) {
1112                         status |= USB_PORT_STAT_CONNECTION;
1113                         // status may be from integrated TT
1114                         if (ehci->has_hostpc) {
1115                                 temp1 = ehci_readl(ehci, hostpc_reg);
1116                                 status |= ehci_port_speed(ehci, temp1);
1117                         } else
1118                                 status |= ehci_port_speed(ehci, temp);
1119                 }
1120                 if (temp & PORT_PE)
1121                         status |= USB_PORT_STAT_ENABLE;
1122
1123                 /* maybe the port was unsuspended without our knowledge */
1124                 if (temp & (PORT_SUSPEND|PORT_RESUME)) {
1125                         status |= USB_PORT_STAT_SUSPEND;
1126                 } else if (test_bit(wIndex, &ehci->suspended_ports)) {
1127                         clear_bit(wIndex, &ehci->suspended_ports);
1128                         clear_bit(wIndex, &ehci->resuming_ports);
1129                         ehci->reset_done[wIndex] = 0;
1130                         if (temp & PORT_PE)
1131                                 set_bit(wIndex, &ehci->port_c_suspend);
1132                         usb_hcd_end_port_resume(&hcd->self, wIndex);
1133                 }
1134
1135                 if (temp & PORT_OC)
1136                         status |= USB_PORT_STAT_OVERCURRENT;
1137                 if (temp & PORT_RESET)
1138                         status |= USB_PORT_STAT_RESET;
1139                 if (temp & PORT_POWER)
1140                         status |= USB_PORT_STAT_POWER;
1141                 if (test_bit(wIndex, &ehci->port_c_suspend))
1142                         status |= USB_PORT_STAT_C_SUSPEND << 16;
1143
1144                 if (status & ~0xffff)   /* only if wPortChange is interesting */
1145                         dbg_port(ehci, "GetStatus", wIndex + 1, temp);
1146                 put_unaligned_le32(status, buf);
1147                 break;
1148         case SetHubFeature:
1149                 switch (wValue) {
1150                 case C_HUB_LOCAL_POWER:
1151                 case C_HUB_OVER_CURRENT:
1152                         /* no hub-wide feature/status flags */
1153                         break;
1154                 default:
1155                         goto error;
1156                 }
1157                 break;
1158         case SetPortFeature:
1159                 selector = wIndex >> 8;
1160                 wIndex &= 0xff;
1161                 if (unlikely(ehci->debug)) {
1162                         /* If the debug port is active any port
1163                          * feature requests should get denied */
1164                         if (wIndex == HCS_DEBUG_PORT(ehci->hcs_params) &&
1165                             (readl(&ehci->debug->control) & DBGP_ENABLED)) {
1166                                 retval = -ENODEV;
1167                                 goto error_exit;
1168                         }
1169                 }
1170                 if (!wIndex || wIndex > ports)
1171                         goto error;
1172                 wIndex--;
1173                 temp = ehci_readl(ehci, status_reg);
1174                 if (temp & PORT_OWNER)
1175                         break;
1176
1177                 temp &= ~PORT_RWC_BITS;
1178                 switch (wValue) {
1179                 case USB_PORT_FEAT_SUSPEND:
1180                         if (ehci->no_selective_suspend)
1181                                 break;
1182                         if ((temp & PORT_PE) == 0
1183                                         || (temp & PORT_RESET) != 0)
1184                                 goto error;
1185
1186                         /* After above check the port must be connected.
1187                          * Set appropriate bit thus could put phy into low power
1188                          * mode if we have tdi_phy_lpm feature
1189                          */
1190                         temp &= ~PORT_WKCONN_E;
1191                         temp |= PORT_WKDISC_E | PORT_WKOC_E;
1192                         ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
1193                         if (ehci->has_tdi_phy_lpm) {
1194                                 spin_unlock_irqrestore(&ehci->lock, flags);
1195                                 msleep(5);/* 5ms for HCD enter low pwr mode */
1196                                 spin_lock_irqsave(&ehci->lock, flags);
1197                                 temp1 = ehci_readl(ehci, hostpc_reg);
1198                                 ehci_writel(ehci, temp1 | HOSTPC_PHCD,
1199                                         hostpc_reg);
1200                                 temp1 = ehci_readl(ehci, hostpc_reg);
1201                                 ehci_dbg(ehci, "Port%d phy low pwr mode %s\n",
1202                                         wIndex, (temp1 & HOSTPC_PHCD) ?
1203                                         "succeeded" : "failed");
1204                         }
1205                         if (ehci_has_fsl_susp_errata(ehci)) {
1206                                 /* 10ms for HCD enter suspend */
1207                                 spin_unlock_irqrestore(&ehci->lock, flags);
1208                                 usleep_range(10000, 20000);
1209                                 spin_lock_irqsave(&ehci->lock, flags);
1210                         }
1211                         set_bit(wIndex, &ehci->suspended_ports);
1212                         break;
1213                 case USB_PORT_FEAT_POWER:
1214                         if (HCS_PPC(ehci->hcs_params)) {
1215                                 spin_unlock_irqrestore(&ehci->lock, flags);
1216                                 ehci_port_power(ehci, wIndex, true);
1217                                 spin_lock_irqsave(&ehci->lock, flags);
1218                         }
1219                         break;
1220                 case USB_PORT_FEAT_RESET:
1221                         if (temp & (PORT_SUSPEND|PORT_RESUME))
1222                                 goto error;
1223                         /* line status bits may report this as low speed,
1224                          * which can be fine if this root hub has a
1225                          * transaction translator built in.
1226                          */
1227                         if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
1228                                         && !ehci_is_TDI(ehci)
1229                                         && PORT_USB11 (temp)) {
1230                                 ehci_dbg (ehci,
1231                                         "port %d low speed --> companion\n",
1232                                         wIndex + 1);
1233                                 temp |= PORT_OWNER;
1234                         } else {
1235                                 temp |= PORT_RESET;
1236                                 temp &= ~PORT_PE;
1237
1238                                 /*
1239                                  * caller must wait, then call GetPortStatus
1240                                  * usb 2.0 spec says 50 ms resets on root
1241                                  */
1242                                 ehci->reset_done [wIndex] = jiffies
1243                                                 + msecs_to_jiffies (50);
1244
1245                                 /*
1246                                  * Force full-speed connect for FSL high-speed
1247                                  * erratum; disable HS Chirp by setting PFSC bit
1248                                  */
1249                                 if (ehci_has_fsl_hs_errata(ehci))
1250                                         temp |= (1 << PORTSC_FSL_PFSC);
1251                         }
1252                         ehci_writel(ehci, temp, status_reg);
1253                         break;
1254
1255                 /* For downstream facing ports (these):  one hub port is put
1256                  * into test mode according to USB2 11.24.2.13, then the hub
1257                  * must be reset (which for root hub now means rmmod+modprobe,
1258                  * or else system reboot).  See EHCI 2.3.9 and 4.14 for info
1259                  * about the EHCI-specific stuff.
1260                  */
1261                 case USB_PORT_FEAT_TEST:
1262 #ifdef CONFIG_USB_HCD_TEST_MODE
1263                         if (selector == EHSET_TEST_SINGLE_STEP_SET_FEATURE) {
1264                                 spin_unlock_irqrestore(&ehci->lock, flags);
1265                                 retval = ehset_single_step_set_feature(hcd,
1266                                                                 wIndex + 1);
1267                                 spin_lock_irqsave(&ehci->lock, flags);
1268                                 break;
1269                         }
1270 #endif
1271                         if (!selector || selector > 5)
1272                                 goto error;
1273                         spin_unlock_irqrestore(&ehci->lock, flags);
1274                         ehci_quiesce(ehci);
1275                         spin_lock_irqsave(&ehci->lock, flags);
1276
1277                         /* Put all enabled ports into suspend */
1278                         while (ports--) {
1279                                 u32 __iomem *sreg =
1280                                                 &ehci->regs->port_status[ports];
1281
1282                                 temp = ehci_readl(ehci, sreg) & ~PORT_RWC_BITS;
1283                                 if (temp & PORT_PE)
1284                                         ehci_writel(ehci, temp | PORT_SUSPEND,
1285                                                         sreg);
1286                         }
1287
1288                         spin_unlock_irqrestore(&ehci->lock, flags);
1289                         ehci_halt(ehci);
1290                         spin_lock_irqsave(&ehci->lock, flags);
1291
1292                         temp = ehci_readl(ehci, status_reg);
1293                         temp |= selector << 16;
1294                         ehci_writel(ehci, temp, status_reg);
1295                         break;
1296
1297                 default:
1298                         goto error;
1299                 }
1300                 ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
1301                 break;
1302
1303         default:
1304 error:
1305                 /* "stall" on error */
1306                 retval = -EPIPE;
1307         }
1308 error_exit:
1309         spin_unlock_irqrestore (&ehci->lock, flags);
1310         return retval;
1311 }
1312 EXPORT_SYMBOL_GPL(ehci_hub_control);
1313
1314 static void ehci_relinquish_port(struct usb_hcd *hcd, int portnum)
1315 {
1316         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1317
1318         if (ehci_is_TDI(ehci))
1319                 return;
1320         set_owner(ehci, --portnum, PORT_OWNER);
1321 }
1322
1323 static int ehci_port_handed_over(struct usb_hcd *hcd, int portnum)
1324 {
1325         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1326         u32 __iomem             *reg;
1327
1328         if (ehci_is_TDI(ehci))
1329                 return 0;
1330         reg = &ehci->regs->port_status[portnum - 1];
1331         return ehci_readl(ehci, reg) & PORT_OWNER;
1332 }
1333
1334 static int ehci_port_power(struct ehci_hcd *ehci, int portnum, bool enable)
1335 {
1336         struct usb_hcd *hcd = ehci_to_hcd(ehci);
1337         u32 __iomem *status_reg = &ehci->regs->port_status[portnum];
1338         u32 temp = ehci_readl(ehci, status_reg) & ~PORT_RWC_BITS;
1339
1340         if (enable)
1341                 ehci_writel(ehci, temp | PORT_POWER, status_reg);
1342         else
1343                 ehci_writel(ehci, temp & ~PORT_POWER, status_reg);
1344
1345         if (hcd->driver->port_power)
1346                 hcd->driver->port_power(hcd, portnum, enable);
1347
1348         return 0;
1349 }