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 #include <linux/usb/otg.h>
  18
  19 #define PORT_WAKE_BITS  (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
  20
  21 #ifdef  CONFIG_PM
  22
  23 static void unlink_empty_async_suspended(struct ehci_hcd *ehci);
  24
  25 static int persist_enabled_on_companion(struct usb_device *udev, void *unused)
  26 {
  27         return !udev->maxchild && udev->persist_enabled &&
  28                 udev->bus->root_hub->speed < USB_SPEED_HIGH;
  29 }
  30
  31 /* After a power loss, ports that were owned by the companion must be
  32  * reset so that the companion can still own them.
  33  */
  34 static void ehci_handover_companion_ports(struct ehci_hcd *ehci)
  35 {
  36         u32 __iomem     *reg;
  37         u32             status;
  38         int             port;
  39         __le32          buf;
  40         struct usb_hcd  *hcd = ehci_to_hcd(ehci);
  41
  42         if (!ehci->owned_ports)
  43                 return;
  44
  45         /*
  46          * USB 1.1 devices are mostly HIDs, which don't need to persist across
  47          * suspends. If we ensure that none of our companion's devices have
  48          * persist_enabled (by looking through all USB 1.1 buses in the system),
  49          * we can skip this and avoid slowing resume down. Devices without
  50          * persist will just get reenumerated shortly after resume anyway.
  51          */
  52         if (!usb_for_each_dev(NULL, persist_enabled_on_companion))
  53                 return;
  54
  55         /* Make sure the ports are powered */
  56         port = HCS_N_PORTS(ehci->hcs_params);
  57         while (port--) {
  58                 if (test_bit(port, &ehci->owned_ports)) {
  59                         reg = &ehci->regs->port_status[port];
  60                         status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
  61                         if (!(status & PORT_POWER))
  62                                 ehci_port_power(ehci, port, true);
  63                 }
  64         }
  65
  66         /* Give the connections some time to appear */
  67         msleep(20);
  68
  69         spin_lock_irq(&ehci->lock);
  70         port = HCS_N_PORTS(ehci->hcs_params);
  71         while (port--) {
  72                 if (test_bit(port, &ehci->owned_ports)) {
  73                         reg = &ehci->regs->port_status[port];
  74                         status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
  75
  76                         /* Port already owned by companion? */
  77                         if (status & PORT_OWNER)
  78                                 clear_bit(port, &ehci->owned_ports);
  79                         else if (test_bit(port, &ehci->companion_ports))
  80                                 ehci_writel(ehci, status & ~PORT_PE, reg);
  81                         else {
  82                                 spin_unlock_irq(&ehci->lock);
  83                                 ehci_hub_control(hcd, SetPortFeature,
  84                                                 USB_PORT_FEAT_RESET, port + 1,
  85                                                 NULL, 0);
  86                                 spin_lock_irq(&ehci->lock);
  87                         }
  88                 }
  89         }
  90         spin_unlock_irq(&ehci->lock);
  91
  92         if (!ehci->owned_ports)
  93                 return;
  94         msleep(90);             /* Wait for resets to complete */
  95
  96         spin_lock_irq(&ehci->lock);
  97         port = HCS_N_PORTS(ehci->hcs_params);
  98         while (port--) {
  99                 if (test_bit(port, &ehci->owned_ports)) {
 100                         spin_unlock_irq(&ehci->lock);
 101                         ehci_hub_control(hcd, GetPortStatus,
 102                                         0, port + 1,
 103                                         (char *) &buf, sizeof(buf));
 104                         spin_lock_irq(&ehci->lock);
 105
 106                         /* The companion should now own the port,
 107                          * but if something went wrong the port must not
 108                          * remain enabled.
 109                          */
 110                         reg = &ehci->regs->port_status[port];
 111                         status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
 112                         if (status & PORT_OWNER)
 113                                 ehci_writel(ehci, status | PORT_CSC, reg);
 114                         else {
 115                                 ehci_dbg(ehci, "failed handover port %d: %x\n",
 116                                                 port + 1, status);
 117                                 ehci_writel(ehci, status & ~PORT_PE, reg);
 118                         }
 119                 }
 120         }
 121
 122         ehci->owned_ports = 0;
 123         spin_unlock_irq(&ehci->lock);
 124 }
 125
 126 static int ehci_port_change(struct ehci_hcd *ehci)
 127 {
 128         int i = HCS_N_PORTS(ehci->hcs_params);
 129
 130         /* First check if the controller indicates a change event */
 131
 132         if (ehci_readl(ehci, &ehci->regs->status) & STS_PCD)
 133                 return 1;
 134
 135         /*
 136          * Not all controllers appear to update this while going from D3 to D0,
 137          * so check the individual port status registers as well
 138          */
 139
 140         while (i--)
 141                 if (ehci_readl(ehci, &ehci->regs->port_status[i]) & PORT_CSC)
 142                         return 1;
 143
 144         return 0;
 145 }
 146
 147 void ehci_adjust_port_wakeup_flags(struct ehci_hcd *ehci,
 148                 bool suspending, bool do_wakeup)
 149 {
 150         int             port;
 151         u32             temp;
 152
 153         /* If remote wakeup is enabled for the root hub but disabled
 154          * for the controller, we must adjust all the port wakeup flags
 155          * when the controller is suspended or resumed.  In all other
 156          * cases they don't need to be changed.
 157          */
 158         if (!ehci_to_hcd(ehci)->self.root_hub->do_remote_wakeup || do_wakeup)
 159                 return;
 160
 161         spin_lock_irq(&ehci->lock);
 162
 163         /* clear phy low-power mode before changing wakeup flags */
 164         if (ehci->has_tdi_phy_lpm) {
 165                 port = HCS_N_PORTS(ehci->hcs_params);
 166                 while (port--) {
 167                         u32 __iomem     *hostpc_reg = &ehci->regs->hostpc[port];
 168
 169                         temp = ehci_readl(ehci, hostpc_reg);
 170                         ehci_writel(ehci, temp & ~HOSTPC_PHCD, hostpc_reg);
 171                 }
 172                 spin_unlock_irq(&ehci->lock);
 173                 msleep(5);
 174                 spin_lock_irq(&ehci->lock);
 175         }
 176
 177         port = HCS_N_PORTS(ehci->hcs_params);
 178         while (port--) {
 179                 u32 __iomem     *reg = &ehci->regs->port_status[port];
 180                 u32             t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
 181                 u32             t2 = t1 & ~PORT_WAKE_BITS;
 182
 183                 /* If we are suspending the controller, clear the flags.
 184                  * If we are resuming the controller, set the wakeup flags.
 185                  */
 186                 if (!suspending) {
 187                         if (t1 & PORT_CONNECT)
 188                                 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
 189                         else
 190                                 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
 191                 }
 192                 ehci_writel(ehci, t2, reg);
 193         }
 194
 195         /* enter phy low-power mode again */
 196         if (ehci->has_tdi_phy_lpm) {
 197                 port = HCS_N_PORTS(ehci->hcs_params);
 198                 while (port--) {
 199                         u32 __iomem     *hostpc_reg = &ehci->regs->hostpc[port];
 200
 201                         temp = ehci_readl(ehci, hostpc_reg);
 202                         ehci_writel(ehci, temp | HOSTPC_PHCD, hostpc_reg);
 203                 }
 204         }
 205
 206         /* Does the root hub have a port wakeup pending? */
 207         if (!suspending && ehci_port_change(ehci))
 208                 usb_hcd_resume_root_hub(ehci_to_hcd(ehci));
 209
 210         spin_unlock_irq(&ehci->lock);
 211 }
 212 EXPORT_SYMBOL_GPL(ehci_adjust_port_wakeup_flags);
 213
 214 static int ehci_bus_suspend (struct usb_hcd *hcd)
 215 {
 216         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 217         int                     port;
 218         int                     mask;
 219         int                     changed;
 220         bool                    fs_idle_delay;
 221
 222         ehci_dbg(ehci, "suspend root hub\n");
 223
 224         if (time_before (jiffies, ehci->next_statechange))
 225                 msleep(5);
 226
 227         /* stop the schedules */
 228         ehci_quiesce(ehci);
 229
 230         spin_lock_irq (&ehci->lock);
 231         if (ehci->rh_state < EHCI_RH_RUNNING)
 232                 goto done;
 233
 234         /* Once the controller is stopped, port resumes that are already
 235          * in progress won't complete.  Hence if remote wakeup is enabled
 236          * for the root hub and any ports are in the middle of a resume or
 237          * remote wakeup, we must fail the suspend.
 238          */
 239         if (hcd->self.root_hub->do_remote_wakeup) {
 240                 if (ehci->resuming_ports) {
 241                         spin_unlock_irq(&ehci->lock);
 242                         ehci_dbg(ehci, "suspend failed because a port is resuming\n");
 243                         return -EBUSY;
 244                 }
 245         }
 246
 247         /* Unlike other USB host controller types, EHCI doesn't have
 248          * any notion of "global" or bus-wide suspend.  The driver has
 249          * to manually suspend all the active unsuspended ports, and
 250          * then manually resume them in the bus_resume() routine.
 251          */
 252         ehci->bus_suspended = 0;
 253         ehci->owned_ports = 0;
 254         changed = 0;
 255         fs_idle_delay = false;
 256         port = HCS_N_PORTS(ehci->hcs_params);
 257         while (port--) {
 258                 u32 __iomem     *reg = &ehci->regs->port_status [port];
 259                 u32             t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
 260                 u32             t2 = t1 & ~PORT_WAKE_BITS;
 261
 262                 /* keep track of which ports we suspend */
 263                 if (t1 & PORT_OWNER)
 264                         set_bit(port, &ehci->owned_ports);
 265                 else if ((t1 & PORT_PE) && !(t1 & PORT_SUSPEND)) {
 266                         t2 |= PORT_SUSPEND;
 267                         set_bit(port, &ehci->bus_suspended);
 268                 }
 269
 270                 /* enable remote wakeup on all ports, if told to do so */
 271                 if (hcd->self.root_hub->do_remote_wakeup) {
 272                         /* only enable appropriate wake bits, otherwise the
 273                          * hardware can not go phy low power mode. If a race
 274                          * condition happens here(connection change during bits
 275                          * set), the port change detection will finally fix it.
 276                          */
 277                         if (t1 & PORT_CONNECT)
 278                                 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
 279                         else
 280                                 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
 281                 }
 282
 283                 if (t1 != t2) {
 284                         /*
 285                          * On some controllers, Wake-On-Disconnect will
 286                          * generate false wakeup signals until the bus
 287                          * switches over to full-speed idle.  For their
 288                          * sake, add a delay if we need one.
 289                          */
 290                         if ((t2 & PORT_WKDISC_E) &&
 291                                         ehci_port_speed(ehci, t2) ==
 292                                                 USB_PORT_STAT_HIGH_SPEED)
 293                                 fs_idle_delay = true;
 294                         ehci_writel(ehci, t2, reg);
 295                         changed = 1;
 296                 }
 297         }
 298         spin_unlock_irq(&ehci->lock);
 299
 300         if (changed && ehci_has_fsl_susp_errata(ehci))
 301                 /*
 302                  * Wait for at least 10 millisecondes to ensure the controller
 303                  * enter the suspend status before initiating a port resume
 304                  * using the Force Port Resume bit (Not-EHCI compatible).
 305                  */
 306                 usleep_range(10000, 20000);
 307
 308         if ((changed && ehci->has_tdi_phy_lpm) || fs_idle_delay) {
 309                 /*
 310                  * Wait for HCD to enter low-power mode or for the bus
 311                  * to switch to full-speed idle.
 312                  */
 313                 usleep_range(5000, 5500);
 314         }
 315
 316         if (changed && ehci->has_tdi_phy_lpm) {
 317                 spin_lock_irq(&ehci->lock);
 318                 port = HCS_N_PORTS(ehci->hcs_params);
 319                 while (port--) {
 320                         u32 __iomem     *hostpc_reg = &ehci->regs->hostpc[port];
 321                         u32             t3;
 322
 323                         t3 = ehci_readl(ehci, hostpc_reg);
 324                         ehci_writel(ehci, t3 | HOSTPC_PHCD, hostpc_reg);
 325                         t3 = ehci_readl(ehci, hostpc_reg);
 326                         ehci_dbg(ehci, "Port %d phy low-power mode %s\n",
 327                                         port, (t3 & HOSTPC_PHCD) ?
 328                                         "succeeded" : "failed");
 329                 }
 330                 spin_unlock_irq(&ehci->lock);
 331         }
 332
 333         /* Apparently some devices need a >= 1-uframe delay here */
 334         if (ehci->bus_suspended)
 335                 udelay(150);
 336
 337         /* turn off now-idle HC */
 338         ehci_halt (ehci);
 339
 340         spin_lock_irq(&ehci->lock);
 341         if (ehci->enabled_hrtimer_events & BIT(EHCI_HRTIMER_POLL_DEAD))
 342                 ehci_handle_controller_death(ehci);
 343         if (ehci->rh_state != EHCI_RH_RUNNING)
 344                 goto done;
 345         ehci->rh_state = EHCI_RH_SUSPENDED;
 346
 347         unlink_empty_async_suspended(ehci);
 348
 349         /* Any IAA cycle that started before the suspend is now invalid */
 350         end_iaa_cycle(ehci);
 351         ehci_handle_start_intr_unlinks(ehci);
 352         ehci_handle_intr_unlinks(ehci);
 353         end_free_itds(ehci);
 354
 355         /* allow remote wakeup */
 356         mask = INTR_MASK;
 357         if (!hcd->self.root_hub->do_remote_wakeup)
 358                 mask &= ~STS_PCD;
 359         ehci_writel(ehci, mask, &ehci->regs->intr_enable);
 360         ehci_readl(ehci, &ehci->regs->intr_enable);
 361
 362  done:
 363         ehci->next_statechange = jiffies + msecs_to_jiffies(10);
 364         ehci->enabled_hrtimer_events = 0;
 365         ehci->next_hrtimer_event = EHCI_HRTIMER_NO_EVENT;
 366         spin_unlock_irq (&ehci->lock);
 367
 368         hrtimer_cancel(&ehci->hrtimer);
 369         return 0;
 370 }
 371
 372
 373 /* caller has locked the root hub, and should reset/reinit on error */
 374 static int ehci_bus_resume (struct usb_hcd *hcd)
 375 {
 376         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 377         u32                     temp;
 378         u32                     power_okay;
 379         int                     i;
 380         unsigned long           resume_needed = 0;
 381
 382         if (time_before (jiffies, ehci->next_statechange))
 383                 msleep(5);
 384         spin_lock_irq (&ehci->lock);
 385         if (!HCD_HW_ACCESSIBLE(hcd) || ehci->shutdown)
 386                 goto shutdown;
 387
 388         if (unlikely(ehci->debug)) {
 389                 if (!dbgp_reset_prep(hcd))
 390                         ehci->debug = NULL;
 391                 else
 392                         dbgp_external_startup(hcd);
 393         }
 394
 395         /* Ideally and we've got a real resume here, and no port's power
 396          * was lost.  (For PCI, that means Vaux was maintained.)  But we
 397          * could instead be restoring a swsusp snapshot -- so that BIOS was
 398          * the last user of the controller, not reset/pm hardware keeping
 399          * state we gave to it.
 400          */
 401         power_okay = ehci_readl(ehci, &ehci->regs->intr_enable);
 402         ehci_dbg(ehci, "resume root hub%s\n",
 403                         power_okay ? "" : " after power loss");
 404
 405         /* at least some APM implementations will try to deliver
 406          * IRQs right away, so delay them until we're ready.
 407          */
 408         ehci_writel(ehci, 0, &ehci->regs->intr_enable);
 409
 410         /* re-init operational registers */
 411         ehci_writel(ehci, 0, &ehci->regs->segment);
 412         ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
 413         ehci_writel(ehci, (u32) ehci->async->qh_dma, &ehci->regs->async_next);
 414
 415         /* restore CMD_RUN, framelist size, and irq threshold */
 416         ehci->command |= CMD_RUN;
 417         ehci_writel(ehci, ehci->command, &ehci->regs->command);
 418         ehci->rh_state = EHCI_RH_RUNNING;
 419
 420         /*
 421          * According to Bugzilla #8190, the port status for some controllers
 422          * will be wrong without a delay. At their wrong status, the port
 423          * is enabled, but not suspended neither resumed.
 424          */
 425         i = HCS_N_PORTS(ehci->hcs_params);
 426         while (i--) {
 427                 temp = ehci_readl(ehci, &ehci->regs->port_status[i]);
 428                 if ((temp & PORT_PE) &&
 429                                 !(temp & (PORT_SUSPEND | PORT_RESUME))) {
 430                         ehci_dbg(ehci, "Port status(0x%x) is wrong\n", temp);
 431                         spin_unlock_irq(&ehci->lock);
 432                         msleep(8);
 433                         spin_lock_irq(&ehci->lock);
 434                         break;
 435                 }
 436         }
 437
 438         if (ehci->shutdown)
 439                 goto shutdown;
 440
 441         /* clear phy low-power mode before resume */
 442         if (ehci->bus_suspended && ehci->has_tdi_phy_lpm) {
 443                 i = HCS_N_PORTS(ehci->hcs_params);
 444                 while (i--) {
 445                         if (test_bit(i, &ehci->bus_suspended)) {
 446                                 u32 __iomem     *hostpc_reg =
 447                                                         &ehci->regs->hostpc[i];
 448
 449                                 temp = ehci_readl(ehci, hostpc_reg);
 450                                 ehci_writel(ehci, temp & ~HOSTPC_PHCD,
 451                                                 hostpc_reg);
 452                         }
 453                 }
 454                 spin_unlock_irq(&ehci->lock);
 455                 msleep(5);
 456                 spin_lock_irq(&ehci->lock);
 457                 if (ehci->shutdown)
 458                         goto shutdown;
 459         }
 460
 461         /* manually resume the ports we suspended during bus_suspend() */
 462         i = HCS_N_PORTS (ehci->hcs_params);
 463         while (i--) {
 464                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 465                 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
 466                 if (test_bit(i, &ehci->bus_suspended) &&
 467                                 (temp & PORT_SUSPEND)) {
 468                         temp |= PORT_RESUME;
 469                         set_bit(i, &resume_needed);
 470                 }
 471                 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
 472         }
 473
 474         /*
 475          * msleep for USB_RESUME_TIMEOUT ms only if code is trying to resume
 476          * port
 477          */
 478         if (resume_needed) {
 479                 spin_unlock_irq(&ehci->lock);
 480                 msleep(USB_RESUME_TIMEOUT);
 481                 spin_lock_irq(&ehci->lock);
 482                 if (ehci->shutdown)
 483                         goto shutdown;
 484         }
 485
 486         i = HCS_N_PORTS (ehci->hcs_params);
 487         while (i--) {
 488                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 489                 if (test_bit(i, &resume_needed)) {
 490                         temp &= ~(PORT_RWC_BITS | PORT_SUSPEND | PORT_RESUME);
 491                         ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
 492                 }
 493         }
 494
 495         ehci->next_statechange = jiffies + msecs_to_jiffies(5);
 496         spin_unlock_irq(&ehci->lock);
 497
 498         ehci_handover_companion_ports(ehci);
 499
 500         /* Now we can safely re-enable irqs */
 501         spin_lock_irq(&ehci->lock);
 502         if (ehci->shutdown)
 503                 goto shutdown;
 504         ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
 505         (void) ehci_readl(ehci, &ehci->regs->intr_enable);
 506         spin_unlock_irq(&ehci->lock);
 507
 508         return 0;
 509
 510  shutdown:
 511         spin_unlock_irq(&ehci->lock);
 512         return -ESHUTDOWN;
 513 }
 514
 515 #else
 516
 517 #define ehci_bus_suspend        NULL
 518 #define ehci_bus_resume         NULL
 519
 520 #endif  /* CONFIG_PM */
 521
 522 /*-------------------------------------------------------------------------*/
 523
 524 /*
 525  * Sets the owner of a port
 526  */
 527 static void set_owner(struct ehci_hcd *ehci, int portnum, int new_owner)
 528 {
 529         u32 __iomem             *status_reg;
 530         u32                     port_status;
 531         int                     try;
 532
 533         status_reg = &ehci->regs->port_status[portnum];
 534
 535         /*
 536          * The controller won't set the OWNER bit if the port is
 537          * enabled, so this loop will sometimes require at least two
 538          * iterations: one to disable the port and one to set OWNER.
 539          */
 540         for (try = 4; try > 0; --try) {
 541                 spin_lock_irq(&ehci->lock);
 542                 port_status = ehci_readl(ehci, status_reg);
 543                 if ((port_status & PORT_OWNER) == new_owner
 544                                 || (port_status & (PORT_OWNER | PORT_CONNECT))
 545                                         == 0)
 546                         try = 0;
 547                 else {
 548                         port_status ^= PORT_OWNER;
 549                         port_status &= ~(PORT_PE | PORT_RWC_BITS);
 550                         ehci_writel(ehci, port_status, status_reg);
 551                 }
 552                 spin_unlock_irq(&ehci->lock);
 553                 if (try > 1)
 554                         msleep(5);
 555         }
 556 }
 557
 558 /*-------------------------------------------------------------------------*/
 559
 560 static int check_reset_complete (
 561         struct ehci_hcd *ehci,
 562         int             index,
 563         u32 __iomem     *status_reg,
 564         int             port_status
 565 ) {
 566         if (!(port_status & PORT_CONNECT))
 567                 return port_status;
 568
 569         /* if reset finished and it's still not enabled -- handoff */
 570         if (!(port_status & PORT_PE)) {
 571
 572                 /* with integrated TT, there's nobody to hand it to! */
 573                 if (ehci_is_TDI(ehci)) {
 574                         ehci_dbg (ehci,
 575                                 "Failed to enable port %d on root hub TT\n",
 576                                 index+1);
 577                         return port_status;
 578                 }
 579
 580                 ehci_dbg (ehci, "port %d full speed --> companion\n",
 581                         index + 1);
 582
 583                 // what happens if HCS_N_CC(params) == 0 ?
 584                 port_status |= PORT_OWNER;
 585                 port_status &= ~PORT_RWC_BITS;
 586                 ehci_writel(ehci, port_status, status_reg);
 587
 588                 /* ensure 440EPX ohci controller state is operational */
 589                 if (ehci->has_amcc_usb23)
 590                         set_ohci_hcfs(ehci, 1);
 591         } else {
 592                 ehci_dbg(ehci, "port %d reset complete, port enabled\n",
 593                         index + 1);
 594                 /* ensure 440EPx ohci controller state is suspended */
 595                 if (ehci->has_amcc_usb23)
 596                         set_ohci_hcfs(ehci, 0);
 597         }
 598
 599         return port_status;
 600 }
 601
 602 /*-------------------------------------------------------------------------*/
 603
 604
 605 /* build "status change" packet (one or two bytes) from HC registers */
 606
 607 static int
 608 ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
 609 {
 610         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 611         u32             temp, status;
 612         u32             mask;
 613         int             ports, i, retval = 1;
 614         unsigned long   flags;
 615         u32             ppcd = ~0;
 616
 617         /* init status to no-changes */
 618         buf [0] = 0;
 619         ports = HCS_N_PORTS (ehci->hcs_params);
 620         if (ports > 7) {
 621                 buf [1] = 0;
 622                 retval++;
 623         }
 624
 625         /* Inform the core about resumes-in-progress by returning
 626          * a non-zero value even if there are no status changes.
 627          */
 628         status = ehci->resuming_ports;
 629
 630         /* Some boards (mostly VIA?) report bogus overcurrent indications,
 631          * causing massive log spam unless we completely ignore them.  It
 632          * may be relevant that VIA VT8235 controllers, where PORT_POWER is
 633          * always set, seem to clear PORT_OCC and PORT_CSC when writing to
 634          * PORT_POWER; that's surprising, but maybe within-spec.
 635          */
 636         if (!ignore_oc)
 637                 mask = PORT_CSC | PORT_PEC | PORT_OCC;
 638         else
 639                 mask = PORT_CSC | PORT_PEC;
 640         // PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
 641
 642         /* no hub change reports (bit 0) for now (power, ...) */
 643
 644         /* port N changes (bit N)? */
 645         spin_lock_irqsave (&ehci->lock, flags);
 646
 647         /* get per-port change detect bits */
 648         if (ehci->has_ppcd)
 649                 ppcd = ehci_readl(ehci, &ehci->regs->status) >> 16;
 650
 651         for (i = 0; i < ports; i++) {
 652                 /* leverage per-port change bits feature */
 653                 if (ppcd & (1 << i))
 654                         temp = ehci_readl(ehci, &ehci->regs->port_status[i]);
 655                 else
 656                         temp = 0;
 657
 658                 /*
 659                  * Return status information even for ports with OWNER set.
 660                  * Otherwise hub_wq wouldn't see the disconnect event when a
 661                  * high-speed device is switched over to the companion
 662                  * controller by the user.
 663                  */
 664
 665                 if ((temp & mask) != 0 || test_bit(i, &ehci->port_c_suspend)
 666                                 || (ehci->reset_done[i] && time_after_eq(
 667                                         jiffies, ehci->reset_done[i]))) {
 668                         if (i < 7)
 669                             buf [0] |= 1 << (i + 1);
 670                         else
 671                             buf [1] |= 1 << (i - 7);
 672                         status = STS_PCD;
 673                 }
 674         }
 675
 676         /* If a resume is in progress, make sure it can finish */
 677         if (ehci->resuming_ports)
 678                 mod_timer(&hcd->rh_timer, jiffies + msecs_to_jiffies(25));
 679
 680         spin_unlock_irqrestore (&ehci->lock, flags);
 681         return status ? retval : 0;
 682 }
 683
 684 /*-------------------------------------------------------------------------*/
 685
 686 static void
 687 ehci_hub_descriptor (
 688         struct ehci_hcd                 *ehci,
 689         struct usb_hub_descriptor       *desc
 690 ) {
 691         int             ports = HCS_N_PORTS (ehci->hcs_params);
 692         u16             temp;
 693
 694         desc->bDescriptorType = USB_DT_HUB;
 695         desc->bPwrOn2PwrGood = 10;      /* ehci 1.0, 2.3.9 says 20ms max */
 696         desc->bHubContrCurrent = 0;
 697
 698         desc->bNbrPorts = ports;
 699         temp = 1 + (ports / 8);
 700         desc->bDescLength = 7 + 2 * temp;
 701
 702         /* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
 703         memset(&desc->u.hs.DeviceRemovable[0], 0, temp);
 704         memset(&desc->u.hs.DeviceRemovable[temp], 0xff, temp);
 705
 706         temp = HUB_CHAR_INDV_PORT_OCPM; /* per-port overcurrent reporting */
 707         if (HCS_PPC (ehci->hcs_params))
 708                 temp |= HUB_CHAR_INDV_PORT_LPSM; /* per-port power control */
 709         else
 710                 temp |= HUB_CHAR_NO_LPSM; /* no power switching */
 711 #if 0
 712 // re-enable when we support USB_PORT_FEAT_INDICATOR below.
 713         if (HCS_INDICATOR (ehci->hcs_params))
 714                 temp |= HUB_CHAR_PORTIND; /* per-port indicators (LEDs) */
 715 #endif
 716         desc->wHubCharacteristics = cpu_to_le16(temp);
 717 }
 718
 719 /*-------------------------------------------------------------------------*/
 720 #ifdef CONFIG_USB_HCD_TEST_MODE
 721
 722 #define EHSET_TEST_SINGLE_STEP_SET_FEATURE 0x06
 723
 724 static void usb_ehset_completion(struct urb *urb)
 725 {
 726         struct completion  *done = urb->context;
 727
 728         complete(done);
 729 }
 730 static int submit_single_step_set_feature(
 731         struct usb_hcd  *hcd,
 732         struct urb      *urb,
 733         int             is_setup
 734 );
 735
 736 /*
 737  * Allocate and initialize a control URB. This request will be used by the
 738  * EHSET SINGLE_STEP_SET_FEATURE test in which the DATA and STATUS stages
 739  * of the GetDescriptor request are sent 15 seconds after the SETUP stage.
 740  * Return NULL if failed.
 741  */
 742 static struct urb *request_single_step_set_feature_urb(
 743         struct usb_device       *udev,
 744         void                    *dr,
 745         void                    *buf,
 746         struct completion       *done
 747 ) {
 748         struct urb *urb;
 749         struct usb_hcd *hcd = bus_to_hcd(udev->bus);
 750         struct usb_host_endpoint *ep;
 751
 752         urb = usb_alloc_urb(0, GFP_KERNEL);
 753         if (!urb)
 754                 return NULL;
 755
 756         urb->pipe = usb_rcvctrlpipe(udev, 0);
 757         ep = (usb_pipein(urb->pipe) ? udev->ep_in : udev->ep_out)
 758                                 [usb_pipeendpoint(urb->pipe)];
 759         if (!ep) {
 760                 usb_free_urb(urb);
 761                 return NULL;
 762         }
 763
 764         urb->ep = ep;
 765         urb->dev = udev;
 766         urb->setup_packet = (void *)dr;
 767         urb->transfer_buffer = buf;
 768         urb->transfer_buffer_length = USB_DT_DEVICE_SIZE;
 769         urb->complete = usb_ehset_completion;
 770         urb->status = -EINPROGRESS;
 771         urb->actual_length = 0;
 772         urb->transfer_flags = URB_DIR_IN;
 773         usb_get_urb(urb);
 774         atomic_inc(&urb->use_count);
 775         atomic_inc(&urb->dev->urbnum);
 776         urb->setup_dma = dma_map_single(
 777                         hcd->self.controller,
 778                         urb->setup_packet,
 779                         sizeof(struct usb_ctrlrequest),
 780                         DMA_TO_DEVICE);
 781         urb->transfer_dma = dma_map_single(
 782                         hcd->self.controller,
 783                         urb->transfer_buffer,
 784                         urb->transfer_buffer_length,
 785                         DMA_FROM_DEVICE);
 786         urb->context = done;
 787         return urb;
 788 }
 789
 790 static int ehset_single_step_set_feature(struct usb_hcd *hcd, int port)
 791 {
 792         int retval = -ENOMEM;
 793         struct usb_ctrlrequest *dr;
 794         struct urb *urb;
 795         struct usb_device *udev;
 796         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 797         struct usb_device_descriptor *buf;
 798         DECLARE_COMPLETION_ONSTACK(done);
 799
 800         /* Obtain udev of the rhub's child port */
 801         udev = usb_hub_find_child(hcd->self.root_hub, port);
 802         if (!udev) {
 803                 ehci_err(ehci, "No device attached to the RootHub\n");
 804                 return -ENODEV;
 805         }
 806         buf = kmalloc(USB_DT_DEVICE_SIZE, GFP_KERNEL);
 807         if (!buf)
 808                 return -ENOMEM;
 809
 810         dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
 811         if (!dr) {
 812                 kfree(buf);
 813                 return -ENOMEM;
 814         }
 815
 816         /* Fill Setup packet for GetDescriptor */
 817         dr->bRequestType = USB_DIR_IN;
 818         dr->bRequest = USB_REQ_GET_DESCRIPTOR;
 819         dr->wValue = cpu_to_le16(USB_DT_DEVICE << 8);
 820         dr->wIndex = 0;
 821         dr->wLength = cpu_to_le16(USB_DT_DEVICE_SIZE);
 822         urb = request_single_step_set_feature_urb(udev, dr, buf, &done);
 823         if (!urb)
 824                 goto cleanup;
 825
 826         /* Submit just the SETUP stage */
 827         retval = submit_single_step_set_feature(hcd, urb, 1);
 828         if (retval)
 829                 goto out1;
 830         if (!wait_for_completion_timeout(&done, msecs_to_jiffies(2000))) {
 831                 usb_kill_urb(urb);
 832                 retval = -ETIMEDOUT;
 833                 ehci_err(ehci, "%s SETUP stage timed out on ep0\n", __func__);
 834                 goto out1;
 835         }
 836         msleep(15 * 1000);
 837
 838         /* Complete remaining DATA and STATUS stages using the same URB */
 839         urb->status = -EINPROGRESS;
 840         usb_get_urb(urb);
 841         atomic_inc(&urb->use_count);
 842         atomic_inc(&urb->dev->urbnum);
 843         retval = submit_single_step_set_feature(hcd, urb, 0);
 844         if (!retval && !wait_for_completion_timeout(&done,
 845                                                 msecs_to_jiffies(2000))) {
 846                 usb_kill_urb(urb);
 847                 retval = -ETIMEDOUT;
 848                 ehci_err(ehci, "%s IN stage timed out on ep0\n", __func__);
 849         }
 850 out1:
 851         usb_free_urb(urb);
 852 cleanup:
 853         kfree(dr);
 854         kfree(buf);
 855         return retval;
 856 }
 857 #endif /* CONFIG_USB_HCD_TEST_MODE */
 858 /*-------------------------------------------------------------------------*/
 859
 860 int ehci_hub_control(
 861         struct usb_hcd  *hcd,
 862         u16             typeReq,
 863         u16             wValue,
 864         u16             wIndex,
 865         char            *buf,
 866         u16             wLength
 867 ) {
 868         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 869         int             ports = HCS_N_PORTS (ehci->hcs_params);
 870         u32 __iomem     *status_reg, *hostpc_reg;
 871         u32             temp, temp1, status;
 872         unsigned long   flags;
 873         int             retval = 0;
 874         unsigned        selector;
 875
 876         /*
 877          * Avoid underflow while calculating (wIndex & 0xff) - 1.
 878          * The compiler might deduce that wIndex can never be 0 and then
 879          * optimize away the tests for !wIndex below.
 880          */
 881         temp = wIndex & 0xff;
 882         temp -= (temp > 0);
 883         status_reg = &ehci->regs->port_status[temp];
 884         hostpc_reg = &ehci->regs->hostpc[temp];
 885
 886         /*
 887          * FIXME:  support SetPortFeatures USB_PORT_FEAT_INDICATOR.
 888          * HCS_INDICATOR may say we can change LEDs to off/amber/green.
 889          * (track current state ourselves) ... blink for diagnostics,
 890          * power, "this is the one", etc.  EHCI spec supports this.
 891          */
 892
 893         spin_lock_irqsave (&ehci->lock, flags);
 894         switch (typeReq) {
 895         case ClearHubFeature:
 896                 switch (wValue) {
 897                 case C_HUB_LOCAL_POWER:
 898                 case C_HUB_OVER_CURRENT:
 899                         /* no hub-wide feature/status flags */
 900                         break;
 901                 default:
 902                         goto error;
 903                 }
 904                 break;
 905         case ClearPortFeature:
 906                 if (!wIndex || wIndex > ports)
 907                         goto error;
 908                 wIndex--;
 909                 temp = ehci_readl(ehci, status_reg);
 910                 temp &= ~PORT_RWC_BITS;
 911
 912                 /*
 913                  * Even if OWNER is set, so the port is owned by the
 914                  * companion controller, hub_wq needs to be able to clear
 915                  * the port-change status bits (especially
 916                  * USB_PORT_STAT_C_CONNECTION).
 917                  */
 918
 919                 switch (wValue) {
 920                 case USB_PORT_FEAT_ENABLE:
 921                         ehci_writel(ehci, temp & ~PORT_PE, status_reg);
 922                         break;
 923                 case USB_PORT_FEAT_C_ENABLE:
 924                         ehci_writel(ehci, temp | PORT_PEC, status_reg);
 925                         break;
 926                 case USB_PORT_FEAT_SUSPEND:
 927                         if (temp & PORT_RESET)
 928                                 goto error;
 929                         if (ehci->no_selective_suspend)
 930                                 break;
 931 #ifdef CONFIG_USB_OTG
 932                         if ((hcd->self.otg_port == (wIndex + 1))
 933                             && hcd->self.b_hnp_enable) {
 934                                 otg_start_hnp(hcd->usb_phy->otg);
 935                                 break;
 936                         }
 937 #endif
 938                         if (!(temp & PORT_SUSPEND))
 939                                 break;
 940                         if ((temp & PORT_PE) == 0)
 941                                 goto error;
 942
 943                         /* clear phy low-power mode before resume */
 944                         if (ehci->has_tdi_phy_lpm) {
 945                                 temp1 = ehci_readl(ehci, hostpc_reg);
 946                                 ehci_writel(ehci, temp1 & ~HOSTPC_PHCD,
 947                                                 hostpc_reg);
 948                                 spin_unlock_irqrestore(&ehci->lock, flags);
 949                                 msleep(5);/* wait to leave low-power mode */
 950                                 spin_lock_irqsave(&ehci->lock, flags);
 951                         }
 952                         /* resume signaling for 20 msec */
 953                         temp &= ~PORT_WAKE_BITS;
 954                         ehci_writel(ehci, temp | PORT_RESUME, status_reg);
 955                         ehci->reset_done[wIndex] = jiffies
 956                                         + msecs_to_jiffies(USB_RESUME_TIMEOUT);
 957                         set_bit(wIndex, &ehci->resuming_ports);
 958                         usb_hcd_start_port_resume(&hcd->self, wIndex);
 959                         break;
 960                 case USB_PORT_FEAT_C_SUSPEND:
 961                         clear_bit(wIndex, &ehci->port_c_suspend);
 962                         break;
 963                 case USB_PORT_FEAT_POWER:
 964                         if (HCS_PPC(ehci->hcs_params)) {
 965                                 spin_unlock_irqrestore(&ehci->lock, flags);
 966                                 ehci_port_power(ehci, wIndex, false);
 967                                 spin_lock_irqsave(&ehci->lock, flags);
 968                         }
 969                         break;
 970                 case USB_PORT_FEAT_C_CONNECTION:
 971                         ehci_writel(ehci, temp | PORT_CSC, status_reg);
 972                         break;
 973                 case USB_PORT_FEAT_C_OVER_CURRENT:
 974                         ehci_writel(ehci, temp | PORT_OCC, status_reg);
 975                         break;
 976                 case USB_PORT_FEAT_C_RESET:
 977                         /* GetPortStatus clears reset */
 978                         break;
 979                 default:
 980                         goto error;
 981                 }
 982                 ehci_readl(ehci, &ehci->regs->command); /* unblock posted write */
 983                 break;
 984         case GetHubDescriptor:
 985                 ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
 986                         buf);
 987                 break;
 988         case GetHubStatus:
 989                 /* no hub-wide feature/status flags */
 990                 memset (buf, 0, 4);
 991                 //cpu_to_le32s ((u32 *) buf);
 992                 break;
 993         case GetPortStatus:
 994                 if (!wIndex || wIndex > ports)
 995                         goto error;
 996                 wIndex--;
 997                 status = 0;
 998                 temp = ehci_readl(ehci, status_reg);
 999
1000                 // wPortChange bits
1001                 if (temp & PORT_CSC)
1002                         status |= USB_PORT_STAT_C_CONNECTION << 16;
1003                 if (temp & PORT_PEC)
1004                         status |= USB_PORT_STAT_C_ENABLE << 16;
1005
1006                 if ((temp & PORT_OCC) && !ignore_oc){
1007                         status |= USB_PORT_STAT_C_OVERCURRENT << 16;
1008
1009                         /*
1010                          * Hubs should disable port power on over-current.
1011                          * However, not all EHCI implementations do this
1012                          * automatically, even if they _do_ support per-port
1013                          * power switching; they're allowed to just limit the
1014                          * current.  hub_wq will turn the power back on.
1015                          */
1016                         if (((temp & PORT_OC) || (ehci->need_oc_pp_cycle))
1017                                         && HCS_PPC(ehci->hcs_params)) {
1018                                 spin_unlock_irqrestore(&ehci->lock, flags);
1019                                 ehci_port_power(ehci, wIndex, false);
1020                                 spin_lock_irqsave(&ehci->lock, flags);
1021                                 temp = ehci_readl(ehci, status_reg);
1022                         }
1023                 }
1024
1025                 /* no reset or resume pending */
1026                 if (!ehci->reset_done[wIndex]) {
1027
1028                         /* Remote Wakeup received? */
1029                         if (temp & PORT_RESUME) {
1030                                 /* resume signaling for 20 msec */
1031                                 ehci->reset_done[wIndex] = jiffies
1032                                                 + msecs_to_jiffies(20);
1033                                 usb_hcd_start_port_resume(&hcd->self, wIndex);
1034                                 set_bit(wIndex, &ehci->resuming_ports);
1035                                 /* check the port again */
1036                                 mod_timer(&ehci_to_hcd(ehci)->rh_timer,
1037                                                 ehci->reset_done[wIndex]);
1038                         }
1039
1040                 /* reset or resume not yet complete */
1041                 } else if (!time_after_eq(jiffies, ehci->reset_done[wIndex])) {
1042                         ;       /* wait until it is complete */
1043
1044                 /* resume completed */
1045                 } else if (test_bit(wIndex, &ehci->resuming_ports)) {
1046                         clear_bit(wIndex, &ehci->suspended_ports);
1047                         set_bit(wIndex, &ehci->port_c_suspend);
1048                         ehci->reset_done[wIndex] = 0;
1049                         usb_hcd_end_port_resume(&hcd->self, wIndex);
1050
1051                         /* stop resume signaling */
1052                         temp &= ~(PORT_RWC_BITS | PORT_SUSPEND | PORT_RESUME);
1053                         ehci_writel(ehci, temp, status_reg);
1054                         clear_bit(wIndex, &ehci->resuming_ports);
1055                         retval = ehci_handshake(ehci, status_reg,
1056                                         PORT_RESUME, 0, 2000 /* 2msec */);
1057                         if (retval != 0) {
1058                                 ehci_err(ehci, "port %d resume error %d\n",
1059                                                 wIndex + 1, retval);
1060                                 goto error;
1061                         }
1062                         temp = ehci_readl(ehci, status_reg);
1063
1064                 /* whoever resets must GetPortStatus to complete it!! */
1065                 } else {
1066                         status |= USB_PORT_STAT_C_RESET << 16;
1067                         ehci->reset_done [wIndex] = 0;
1068
1069                         /* force reset to complete */
1070                         ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESET),
1071                                         status_reg);
1072                         /* REVISIT:  some hardware needs 550+ usec to clear
1073                          * this bit; seems too long to spin routinely...
1074                          */
1075                         retval = ehci_handshake(ehci, status_reg,
1076                                         PORT_RESET, 0, 1000);
1077                         if (retval != 0) {
1078                                 ehci_err (ehci, "port %d reset error %d\n",
1079                                         wIndex + 1, retval);
1080                                 goto error;
1081                         }
1082
1083                         /* see what we found out */
1084                         temp = check_reset_complete (ehci, wIndex, status_reg,
1085                                         ehci_readl(ehci, status_reg));
1086                 }
1087
1088                 /* transfer dedicated ports to the companion hc */
1089                 if ((temp & PORT_CONNECT) &&
1090                                 test_bit(wIndex, &ehci->companion_ports)) {
1091                         temp &= ~PORT_RWC_BITS;
1092                         temp |= PORT_OWNER;
1093                         ehci_writel(ehci, temp, status_reg);
1094                         ehci_dbg(ehci, "port %d --> companion\n", wIndex + 1);
1095                         temp = ehci_readl(ehci, status_reg);
1096                 }
1097
1098                 /*
1099                  * Even if OWNER is set, there's no harm letting hub_wq
1100                  * see the wPortStatus values (they should all be 0 except
1101                  * for PORT_POWER anyway).
1102                  */
1103
1104                 if (temp & PORT_CONNECT) {
1105                         status |= USB_PORT_STAT_CONNECTION;
1106                         // status may be from integrated TT
1107                         if (ehci->has_hostpc) {
1108                                 temp1 = ehci_readl(ehci, hostpc_reg);
1109                                 status |= ehci_port_speed(ehci, temp1);
1110                         } else
1111                                 status |= ehci_port_speed(ehci, temp);
1112                 }
1113                 if (temp & PORT_PE)
1114                         status |= USB_PORT_STAT_ENABLE;
1115
1116                 /* maybe the port was unsuspended without our knowledge */
1117                 if (temp & (PORT_SUSPEND|PORT_RESUME)) {
1118                         status |= USB_PORT_STAT_SUSPEND;
1119                 } else if (test_bit(wIndex, &ehci->suspended_ports)) {
1120                         clear_bit(wIndex, &ehci->suspended_ports);
1121                         clear_bit(wIndex, &ehci->resuming_ports);
1122                         ehci->reset_done[wIndex] = 0;
1123                         if (temp & PORT_PE)
1124                                 set_bit(wIndex, &ehci->port_c_suspend);
1125                         usb_hcd_end_port_resume(&hcd->self, wIndex);
1126                 }
1127
1128                 if (temp & PORT_OC)
1129                         status |= USB_PORT_STAT_OVERCURRENT;
1130                 if (temp & PORT_RESET)
1131                         status |= USB_PORT_STAT_RESET;
1132                 if (temp & PORT_POWER)
1133                         status |= USB_PORT_STAT_POWER;
1134                 if (test_bit(wIndex, &ehci->port_c_suspend))
1135                         status |= USB_PORT_STAT_C_SUSPEND << 16;
1136
1137                 if (status & ~0xffff)   /* only if wPortChange is interesting */
1138                         dbg_port(ehci, "GetStatus", wIndex + 1, temp);
1139                 put_unaligned_le32(status, buf);
1140                 break;
1141         case SetHubFeature:
1142                 switch (wValue) {
1143                 case C_HUB_LOCAL_POWER:
1144                 case C_HUB_OVER_CURRENT:
1145                         /* no hub-wide feature/status flags */
1146                         break;
1147                 default:
1148                         goto error;
1149                 }
1150                 break;
1151         case SetPortFeature:
1152                 selector = wIndex >> 8;
1153                 wIndex &= 0xff;
1154                 if (unlikely(ehci->debug)) {
1155                         /* If the debug port is active any port
1156                          * feature requests should get denied */
1157                         if (wIndex == HCS_DEBUG_PORT(ehci->hcs_params) &&
1158                             (readl(&ehci->debug->control) & DBGP_ENABLED)) {
1159                                 retval = -ENODEV;
1160                                 goto error_exit;
1161                         }
1162                 }
1163                 if (!wIndex || wIndex > ports)
1164                         goto error;
1165                 wIndex--;
1166                 temp = ehci_readl(ehci, status_reg);
1167                 if (temp & PORT_OWNER)
1168                         break;
1169
1170                 temp &= ~PORT_RWC_BITS;
1171                 switch (wValue) {
1172                 case USB_PORT_FEAT_SUSPEND:
1173                         if (ehci->no_selective_suspend)
1174                                 break;
1175                         if ((temp & PORT_PE) == 0
1176                                         || (temp & PORT_RESET) != 0)
1177                                 goto error;
1178
1179                         /* After above check the port must be connected.
1180                          * Set appropriate bit thus could put phy into low power
1181                          * mode if we have tdi_phy_lpm feature
1182                          */
1183                         temp &= ~PORT_WKCONN_E;
1184                         temp |= PORT_WKDISC_E | PORT_WKOC_E;
1185                         ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
1186                         if (ehci->has_tdi_phy_lpm) {
1187                                 spin_unlock_irqrestore(&ehci->lock, flags);
1188                                 msleep(5);/* 5ms for HCD enter low pwr mode */
1189                                 spin_lock_irqsave(&ehci->lock, flags);
1190                                 temp1 = ehci_readl(ehci, hostpc_reg);
1191                                 ehci_writel(ehci, temp1 | HOSTPC_PHCD,
1192                                         hostpc_reg);
1193                                 temp1 = ehci_readl(ehci, hostpc_reg);
1194                                 ehci_dbg(ehci, "Port%d phy low pwr mode %s\n",
1195                                         wIndex, (temp1 & HOSTPC_PHCD) ?
1196                                         "succeeded" : "failed");
1197                         }
1198                         if (ehci_has_fsl_susp_errata(ehci)) {
1199                                 /* 10ms for HCD enter suspend */
1200                                 spin_unlock_irqrestore(&ehci->lock, flags);
1201                                 usleep_range(10000, 20000);
1202                                 spin_lock_irqsave(&ehci->lock, flags);
1203                         }
1204                         set_bit(wIndex, &ehci->suspended_ports);
1205                         break;
1206                 case USB_PORT_FEAT_POWER:
1207                         if (HCS_PPC(ehci->hcs_params)) {
1208                                 spin_unlock_irqrestore(&ehci->lock, flags);
1209                                 ehci_port_power(ehci, wIndex, true);
1210                                 spin_lock_irqsave(&ehci->lock, flags);
1211                         }
1212                         break;
1213                 case USB_PORT_FEAT_RESET:
1214                         if (temp & (PORT_SUSPEND|PORT_RESUME))
1215                                 goto error;
1216                         /* line status bits may report this as low speed,
1217                          * which can be fine if this root hub has a
1218                          * transaction translator built in.
1219                          */
1220                         if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
1221                                         && !ehci_is_TDI(ehci)
1222                                         && PORT_USB11 (temp)) {
1223                                 ehci_dbg (ehci,
1224                                         "port %d low speed --> companion\n",
1225                                         wIndex + 1);
1226                                 temp |= PORT_OWNER;
1227                         } else {
1228                                 temp |= PORT_RESET;
1229                                 temp &= ~PORT_PE;
1230
1231                                 /*
1232                                  * caller must wait, then call GetPortStatus
1233                                  * usb 2.0 spec says 50 ms resets on root
1234                                  */
1235                                 ehci->reset_done [wIndex] = jiffies
1236                                                 + msecs_to_jiffies (50);
1237
1238                                 /*
1239                                  * Force full-speed connect for FSL high-speed
1240                                  * erratum; disable HS Chirp by setting PFSC bit
1241                                  */
1242                                 if (ehci_has_fsl_hs_errata(ehci))
1243                                         temp |= (1 << PORTSC_FSL_PFSC);
1244                         }
1245                         ehci_writel(ehci, temp, status_reg);
1246                         break;
1247
1248                 /* For downstream facing ports (these):  one hub port is put
1249                  * into test mode according to USB2 11.24.2.13, then the hub
1250                  * must be reset (which for root hub now means rmmod+modprobe,
1251                  * or else system reboot).  See EHCI 2.3.9 and 4.14 for info
1252                  * about the EHCI-specific stuff.
1253                  */
1254                 case USB_PORT_FEAT_TEST:
1255 #ifdef CONFIG_USB_HCD_TEST_MODE
1256                         if (selector == EHSET_TEST_SINGLE_STEP_SET_FEATURE) {
1257                                 spin_unlock_irqrestore(&ehci->lock, flags);
1258                                 retval = ehset_single_step_set_feature(hcd,
1259                                                                 wIndex + 1);
1260                                 spin_lock_irqsave(&ehci->lock, flags);
1261                                 break;
1262                         }
1263 #endif
1264                         if (!selector || selector > 5)
1265                                 goto error;
1266                         spin_unlock_irqrestore(&ehci->lock, flags);
1267                         ehci_quiesce(ehci);
1268                         spin_lock_irqsave(&ehci->lock, flags);
1269
1270                         /* Put all enabled ports into suspend */
1271                         while (ports--) {
1272                                 u32 __iomem *sreg =
1273                                                 &ehci->regs->port_status[ports];
1274
1275                                 temp = ehci_readl(ehci, sreg) & ~PORT_RWC_BITS;
1276                                 if (temp & PORT_PE)
1277                                         ehci_writel(ehci, temp | PORT_SUSPEND,
1278                                                         sreg);
1279                         }
1280
1281                         spin_unlock_irqrestore(&ehci->lock, flags);
1282                         ehci_halt(ehci);
1283                         spin_lock_irqsave(&ehci->lock, flags);
1284
1285                         temp = ehci_readl(ehci, status_reg);
1286                         temp |= selector << 16;
1287                         ehci_writel(ehci, temp, status_reg);
1288                         break;
1289
1290                 default:
1291                         goto error;
1292                 }
1293                 ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
1294                 break;
1295
1296         default:
1297 error:
1298                 /* "stall" on error */
1299                 retval = -EPIPE;
1300         }
1301 error_exit:
1302         spin_unlock_irqrestore (&ehci->lock, flags);
1303         return retval;
1304 }
1305 EXPORT_SYMBOL_GPL(ehci_hub_control);
1306
1307 static void ehci_relinquish_port(struct usb_hcd *hcd, int portnum)
1308 {
1309         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1310
1311         if (ehci_is_TDI(ehci))
1312                 return;
1313         set_owner(ehci, --portnum, PORT_OWNER);
1314 }
1315
1316 static int ehci_port_handed_over(struct usb_hcd *hcd, int portnum)
1317 {
1318         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1319         u32 __iomem             *reg;
1320
1321         if (ehci_is_TDI(ehci))
1322                 return 0;
1323         reg = &ehci->regs->port_status[portnum - 1];
1324         return ehci_readl(ehci, reg) & PORT_OWNER;
1325 }
1326
1327 static int ehci_port_power(struct ehci_hcd *ehci, int portnum, bool enable)
1328 {
1329         struct usb_hcd *hcd = ehci_to_hcd(ehci);
1330         u32 __iomem *status_reg = &ehci->regs->port_status[portnum];
1331         u32 temp = ehci_readl(ehci, status_reg) & ~PORT_RWC_BITS;
1332
1333         if (enable)
1334                 ehci_writel(ehci, temp | PORT_POWER, status_reg);
1335         else
1336                 ehci_writel(ehci, temp & ~PORT_POWER, status_reg);
1337
1338         if (hcd->driver->port_power)
1339                 hcd->driver->port_power(hcd, portnum, enable);
1340
1341         return 0;
1342 }