drivers/usb/host/ehci-hub.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2001-2004 by David Brownell
   4  */
   5
   6 /* this file is part of ehci-hcd.c */
   7
   8 /*-------------------------------------------------------------------------*/
   9
  10 /*
  11  * EHCI Root Hub ... the nonsharable stuff
  12  *
  13  * Registers don't need cpu_to_le32, that happens transparently
  14  */
  15
  16 /*-------------------------------------------------------------------------*/
  17
  18 #define PORT_WAKE_BITS  (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
  19
  20 #ifdef  CONFIG_PM
  21
  22 static void unlink_empty_async_suspended(struct ehci_hcd *ehci);
  23
  24 static int persist_enabled_on_companion(struct usb_device *udev, void *unused)
  25 {
  26         return !udev->maxchild && udev->persist_enabled &&
  27                 udev->bus->root_hub->speed < USB_SPEED_HIGH;
  28 }
  29
  30 /* After a power loss, ports that were owned by the companion must be
  31  * reset so that the companion can still own them.
  32  */
  33 static void ehci_handover_companion_ports(struct ehci_hcd *ehci)
  34 {
  35         u32 __iomem     *reg;
  36         u32             status;
  37         int             port;
  38         __le32          buf;
  39         struct usb_hcd  *hcd = ehci_to_hcd(ehci);
  40
  41         if (!ehci->owned_ports)
  42                 return;
  43
  44         /*
  45          * USB 1.1 devices are mostly HIDs, which don't need to persist across
  46          * suspends. If we ensure that none of our companion's devices have
  47          * persist_enabled (by looking through all USB 1.1 buses in the system),
  48          * we can skip this and avoid slowing resume down. Devices without
  49          * persist will just get reenumerated shortly after resume anyway.
  50          */
  51         if (!usb_for_each_dev(NULL, persist_enabled_on_companion))
  52                 return;
  53
  54         /* Make sure the ports are powered */
  55         port = HCS_N_PORTS(ehci->hcs_params);
  56         while (port--) {
  57                 if (test_bit(port, &ehci->owned_ports)) {
  58                         reg = &ehci->regs->port_status[port];
  59                         status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
  60                         if (!(status & PORT_POWER))
  61                                 ehci_port_power(ehci, port, true);
  62                 }
  63         }
  64
  65         /* Give the connections some time to appear */
  66         msleep(20);
  67
  68         spin_lock_irq(&ehci->lock);
  69         port = HCS_N_PORTS(ehci->hcs_params);
  70         while (port--) {
  71                 if (test_bit(port, &ehci->owned_ports)) {
  72                         reg = &ehci->regs->port_status[port];
  73                         status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
  74
  75                         /* Port already owned by companion? */
  76                         if (status & PORT_OWNER)
  77                                 clear_bit(port, &ehci->owned_ports);
  78                         else if (test_bit(port, &ehci->companion_ports))
  79                                 ehci_writel(ehci, status & ~PORT_PE, reg);
  80                         else {
  81                                 spin_unlock_irq(&ehci->lock);
  82                                 ehci_hub_control(hcd, SetPortFeature,
  83                                                 USB_PORT_FEAT_RESET, port + 1,
  84                                                 NULL, 0);
  85                                 spin_lock_irq(&ehci->lock);
  86                         }
  87                 }
  88         }
  89         spin_unlock_irq(&ehci->lock);
  90
  91         if (!ehci->owned_ports)
  92                 return;
  93         msleep(90);             /* Wait for resets to complete */
  94
  95         spin_lock_irq(&ehci->lock);
  96         port = HCS_N_PORTS(ehci->hcs_params);
  97         while (port--) {
  98                 if (test_bit(port, &ehci->owned_ports)) {
  99                         spin_unlock_irq(&ehci->lock);
 100                         ehci_hub_control(hcd, GetPortStatus,
 101                                         0, port + 1,
 102                                         (char *) &buf, sizeof(buf));
 103                         spin_lock_irq(&ehci->lock);
 104
 105                         /* The companion should now own the port,
 106                          * but if something went wrong the port must not
 107                          * remain enabled.
 108                          */
 109                         reg = &ehci->regs->port_status[port];
 110                         status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
 111                         if (status & PORT_OWNER)
 112                                 ehci_writel(ehci, status | PORT_CSC, reg);
 113                         else {
 114                                 ehci_dbg(ehci, "failed handover port %d: %x\n",
 115                                                 port + 1, status);
 116                                 ehci_writel(ehci, status & ~PORT_PE, reg);
 117                         }
 118                 }
 119         }
 120
 121         ehci->owned_ports = 0;
 122         spin_unlock_irq(&ehci->lock);
 123 }
 124
 125 static int ehci_port_change(struct ehci_hcd *ehci)
 126 {
 127         int i = HCS_N_PORTS(ehci->hcs_params);
 128
 129         /* First check if the controller indicates a change event */
 130
 131         if (ehci_readl(ehci, &ehci->regs->status) & STS_PCD)
 132                 return 1;
 133
 134         /*
 135          * Not all controllers appear to update this while going from D3 to D0,
 136          * so check the individual port status registers as well
 137          */
 138
 139         while (i--)
 140                 if (ehci_readl(ehci, &ehci->regs->port_status[i]) & PORT_CSC)
 141                         return 1;
 142
 143         return 0;
 144 }
 145
 146 void ehci_adjust_port_wakeup_flags(struct ehci_hcd *ehci,
 147                 bool suspending, bool do_wakeup)
 148 {
 149         int             port;
 150         u32             temp;
 151
 152         /* If remote wakeup is enabled for the root hub but disabled
 153          * for the controller, we must adjust all the port wakeup flags
 154          * when the controller is suspended or resumed.  In all other
 155          * cases they don't need to be changed.
 156          */
 157         if (!ehci_to_hcd(ehci)->self.root_hub->do_remote_wakeup || do_wakeup)
 158                 return;
 159
 160         spin_lock_irq(&ehci->lock);
 161
 162         /* clear phy low-power mode before changing wakeup flags */
 163         if (ehci->has_tdi_phy_lpm) {
 164                 port = HCS_N_PORTS(ehci->hcs_params);
 165                 while (port--) {
 166                         u32 __iomem     *hostpc_reg = &ehci->regs->hostpc[port];
 167
 168                         temp = ehci_readl(ehci, hostpc_reg);
 169                         ehci_writel(ehci, temp & ~HOSTPC_PHCD, hostpc_reg);
 170                 }
 171                 spin_unlock_irq(&ehci->lock);
 172                 msleep(5);
 173                 spin_lock_irq(&ehci->lock);
 174         }
 175
 176         port = HCS_N_PORTS(ehci->hcs_params);
 177         while (port--) {
 178                 u32 __iomem     *reg = &ehci->regs->port_status[port];
 179                 u32             t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
 180                 u32             t2 = t1 & ~PORT_WAKE_BITS;
 181
 182                 /* If we are suspending the controller, clear the flags.
 183                  * If we are resuming the controller, set the wakeup flags.
 184                  */
 185                 if (!suspending) {
 186                         if (t1 & PORT_CONNECT)
 187                                 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
 188                         else
 189                                 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
 190                 }
 191                 ehci_writel(ehci, t2, reg);
 192         }
 193
 194         /* enter phy low-power mode again */
 195         if (ehci->has_tdi_phy_lpm) {
 196                 port = HCS_N_PORTS(ehci->hcs_params);
 197                 while (port--) {
 198                         u32 __iomem     *hostpc_reg = &ehci->regs->hostpc[port];
 199
 200                         temp = ehci_readl(ehci, hostpc_reg);
 201                         ehci_writel(ehci, temp | HOSTPC_PHCD, hostpc_reg);
 202                 }
 203         }
 204
 205         /* Does the root hub have a port wakeup pending? */
 206         if (!suspending && ehci_port_change(ehci))
 207                 usb_hcd_resume_root_hub(ehci_to_hcd(ehci));
 208
 209         spin_unlock_irq(&ehci->lock);
 210 }
 211 EXPORT_SYMBOL_GPL(ehci_adjust_port_wakeup_flags);
 212
 213 static int ehci_bus_suspend (struct usb_hcd *hcd)
 214 {
 215         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 216         int                     port;
 217         int                     mask;
 218         int                     changed;
 219         bool                    fs_idle_delay;
 220
 221         ehci_dbg(ehci, "suspend root hub\n");
 222
 223         if (time_before (jiffies, ehci->next_statechange))
 224                 msleep(5);
 225
 226         /* stop the schedules */
 227         ehci_quiesce(ehci);
 228
 229         spin_lock_irq (&ehci->lock);
 230         if (ehci->rh_state < EHCI_RH_RUNNING)
 231                 goto done;
 232
 233         /* Once the controller is stopped, port resumes that are already
 234          * in progress won't complete.  Hence if remote wakeup is enabled
 235          * for the root hub and any ports are in the middle of a resume or
 236          * remote wakeup, we must fail the suspend.
 237          */
 238         if (hcd->self.root_hub->do_remote_wakeup) {
 239                 if (ehci->resuming_ports) {
 240                         spin_unlock_irq(&ehci->lock);
 241                         ehci_dbg(ehci, "suspend failed because a port is resuming\n");
 242                         return -EBUSY;
 243                 }
 244         }
 245
 246         /* Unlike other USB host controller types, EHCI doesn't have
 247          * any notion of "global" or bus-wide suspend.  The driver has
 248          * to manually suspend all the active unsuspended ports, and
 249          * then manually resume them in the bus_resume() routine.
 250          */
 251         ehci->bus_suspended = 0;
 252         ehci->owned_ports = 0;
 253         changed = 0;
 254         fs_idle_delay = false;
 255         port = HCS_N_PORTS(ehci->hcs_params);
 256         while (port--) {
 257                 u32 __iomem     *reg = &ehci->regs->port_status [port];
 258                 u32             t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
 259                 u32             t2 = t1 & ~PORT_WAKE_BITS;
 260
 261                 /* keep track of which ports we suspend */
 262                 if (t1 & PORT_OWNER)
 263                         set_bit(port, &ehci->owned_ports);
 264                 else if ((t1 & PORT_PE) && !(t1 & PORT_SUSPEND)) {
 265                         t2 |= PORT_SUSPEND;
 266                         set_bit(port, &ehci->bus_suspended);
 267                 }
 268
 269                 /* enable remote wakeup on all ports, if told to do so */
 270                 if (hcd->self.root_hub->do_remote_wakeup) {
 271                         /* only enable appropriate wake bits, otherwise the
 272                          * hardware can not go phy low power mode. If a race
 273                          * condition happens here(connection change during bits
 274                          * set), the port change detection will finally fix it.
 275                          */
 276                         if (t1 & PORT_CONNECT)
 277                                 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
 278                         else
 279                                 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
 280                 }
 281
 282                 if (t1 != t2) {
 283                         /*
 284                          * On some controllers, Wake-On-Disconnect will
 285                          * generate false wakeup signals until the bus
 286                          * switches over to full-speed idle.  For their
 287                          * sake, add a delay if we need one.
 288                          */
 289                         if ((t2 & PORT_WKDISC_E) &&
 290                                         ehci_port_speed(ehci, t2) ==
 291                                                 USB_PORT_STAT_HIGH_SPEED)
 292                                 fs_idle_delay = true;
 293                         ehci_writel(ehci, t2, reg);
 294                         changed = 1;
 295                 }
 296         }
 297         spin_unlock_irq(&ehci->lock);
 298
 299         if (changed && ehci_has_fsl_susp_errata(ehci))
 300                 /*
 301                  * Wait for at least 10 millisecondes to ensure the controller
 302                  * enter the suspend status before initiating a port resume
 303                  * using the Force Port Resume bit (Not-EHCI compatible).
 304                  */
 305                 usleep_range(10000, 20000);
 306
 307         if ((changed && ehci->has_tdi_phy_lpm) || fs_idle_delay) {
 308                 /*
 309                  * Wait for HCD to enter low-power mode or for the bus
 310                  * to switch to full-speed idle.
 311                  */
 312                 usleep_range(5000, 5500);
 313         }
 314
 315         if (changed && ehci->has_tdi_phy_lpm) {
 316                 spin_lock_irq(&ehci->lock);
 317                 port = HCS_N_PORTS(ehci->hcs_params);
 318                 while (port--) {
 319                         u32 __iomem     *hostpc_reg = &ehci->regs->hostpc[port];
 320                         u32             t3;
 321
 322                         t3 = ehci_readl(ehci, hostpc_reg);
 323                         ehci_writel(ehci, t3 | HOSTPC_PHCD, hostpc_reg);
 324                         t3 = ehci_readl(ehci, hostpc_reg);
 325                         ehci_dbg(ehci, "Port %d phy low-power mode %s\n",
 326                                         port, (t3 & HOSTPC_PHCD) ?
 327                                         "succeeded" : "failed");
 328                 }
 329                 spin_unlock_irq(&ehci->lock);
 330         }
 331
 332         /* Apparently some devices need a >= 1-uframe delay here */
 333         if (ehci->bus_suspended)
 334                 udelay(150);
 335
 336         /* turn off now-idle HC */
 337         ehci_halt (ehci);
 338
 339         spin_lock_irq(&ehci->lock);
 340         if (ehci->enabled_hrtimer_events & BIT(EHCI_HRTIMER_POLL_DEAD))
 341                 ehci_handle_controller_death(ehci);
 342         if (ehci->rh_state != EHCI_RH_RUNNING)
 343                 goto done;
 344         ehci->rh_state = EHCI_RH_SUSPENDED;
 345
 346         unlink_empty_async_suspended(ehci);
 347
 348         /* Some Synopsys controllers mistakenly leave IAA turned on */
 349         ehci_writel(ehci, STS_IAA, &ehci->regs->status);
 350
 351         /* Any IAA cycle that started before the suspend is now invalid */
 352         end_iaa_cycle(ehci);
 353         ehci_handle_start_intr_unlinks(ehci);
 354         ehci_handle_intr_unlinks(ehci);
 355         end_free_itds(ehci);
 356
 357         /* allow remote wakeup */
 358         mask = INTR_MASK;
 359         if (!hcd->self.root_hub->do_remote_wakeup)
 360                 mask &= ~STS_PCD;
 361         ehci_writel(ehci, mask, &ehci->regs->intr_enable);
 362         ehci_readl(ehci, &ehci->regs->intr_enable);
 363
 364  done:
 365         ehci->next_statechange = jiffies + msecs_to_jiffies(10);
 366         ehci->enabled_hrtimer_events = 0;
 367         ehci->next_hrtimer_event = EHCI_HRTIMER_NO_EVENT;
 368         spin_unlock_irq (&ehci->lock);
 369
 370         hrtimer_cancel(&ehci->hrtimer);
 371         return 0;
 372 }
 373
 374
 375 /* caller has locked the root hub, and should reset/reinit on error */
 376 static int ehci_bus_resume (struct usb_hcd *hcd)
 377 {
 378         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 379         u32                     temp;
 380         u32                     power_okay;
 381         int                     i;
 382         unsigned long           resume_needed = 0;
 383
 384         if (time_before (jiffies, ehci->next_statechange))
 385                 msleep(5);
 386         spin_lock_irq (&ehci->lock);
 387         if (!HCD_HW_ACCESSIBLE(hcd) || ehci->shutdown)
 388                 goto shutdown;
 389
 390         if (unlikely(ehci->debug)) {
 391                 if (!dbgp_reset_prep(hcd))
 392                         ehci->debug = NULL;
 393                 else
 394                         dbgp_external_startup(hcd);
 395         }
 396
 397         /* Ideally and we've got a real resume here, and no port's power
 398          * was lost.  (For PCI, that means Vaux was maintained.)  But we
 399          * could instead be restoring a swsusp snapshot -- so that BIOS was
 400          * the last user of the controller, not reset/pm hardware keeping
 401          * state we gave to it.
 402          */
 403         power_okay = ehci_readl(ehci, &ehci->regs->intr_enable);
 404         ehci_dbg(ehci, "resume root hub%s\n",
 405                         power_okay ? "" : " after power loss");
 406
 407         /* at least some APM implementations will try to deliver
 408          * IRQs right away, so delay them until we're ready.
 409          */
 410         ehci_writel(ehci, 0, &ehci->regs->intr_enable);
 411
 412         /* re-init operational registers */
 413         ehci_writel(ehci, 0, &ehci->regs->segment);
 414         ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
 415         ehci_writel(ehci, (u32) ehci->async->qh_dma, &ehci->regs->async_next);
 416
 417         /* restore CMD_RUN, framelist size, and irq threshold */
 418         ehci->command |= CMD_RUN;
 419         ehci_writel(ehci, ehci->command, &ehci->regs->command);
 420         ehci->rh_state = EHCI_RH_RUNNING;
 421
 422         /*
 423          * According to Bugzilla #8190, the port status for some controllers
 424          * will be wrong without a delay. At their wrong status, the port
 425          * is enabled, but not suspended neither resumed.
 426          */
 427         i = HCS_N_PORTS(ehci->hcs_params);
 428         while (i--) {
 429                 temp = ehci_readl(ehci, &ehci->regs->port_status[i]);
 430                 if ((temp & PORT_PE) &&
 431                                 !(temp & (PORT_SUSPEND | PORT_RESUME))) {
 432                         ehci_dbg(ehci, "Port status(0x%x) is wrong\n", temp);
 433                         spin_unlock_irq(&ehci->lock);
 434                         msleep(8);
 435                         spin_lock_irq(&ehci->lock);
 436                         break;
 437                 }
 438         }
 439
 440         if (ehci->shutdown)
 441                 goto shutdown;
 442
 443         /* clear phy low-power mode before resume */
 444         if (ehci->bus_suspended && ehci->has_tdi_phy_lpm) {
 445                 i = HCS_N_PORTS(ehci->hcs_params);
 446                 while (i--) {
 447                         if (test_bit(i, &ehci->bus_suspended)) {
 448                                 u32 __iomem     *hostpc_reg =
 449                                                         &ehci->regs->hostpc[i];
 450
 451                                 temp = ehci_readl(ehci, hostpc_reg);
 452                                 ehci_writel(ehci, temp & ~HOSTPC_PHCD,
 453                                                 hostpc_reg);
 454                         }
 455                 }
 456                 spin_unlock_irq(&ehci->lock);
 457                 msleep(5);
 458                 spin_lock_irq(&ehci->lock);
 459                 if (ehci->shutdown)
 460                         goto shutdown;
 461         }
 462
 463         /* manually resume the ports we suspended during bus_suspend() */
 464         i = HCS_N_PORTS (ehci->hcs_params);
 465         while (i--) {
 466                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 467                 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
 468                 if (test_bit(i, &ehci->bus_suspended) &&
 469                                 (temp & PORT_SUSPEND)) {
 470                         temp |= PORT_RESUME;
 471                         set_bit(i, &resume_needed);
 472                 }
 473                 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
 474         }
 475
 476         /*
 477          * msleep for USB_RESUME_TIMEOUT ms only if code is trying to resume
 478          * port
 479          */
 480         if (resume_needed) {
 481                 spin_unlock_irq(&ehci->lock);
 482                 msleep(USB_RESUME_TIMEOUT);
 483                 spin_lock_irq(&ehci->lock);
 484                 if (ehci->shutdown)
 485                         goto shutdown;
 486         }
 487
 488         i = HCS_N_PORTS (ehci->hcs_params);
 489         while (i--) {
 490                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 491                 if (test_bit(i, &resume_needed)) {
 492                         temp &= ~(PORT_RWC_BITS | PORT_SUSPEND | PORT_RESUME);
 493                         ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
 494                 }
 495         }
 496
 497         ehci->next_statechange = jiffies + msecs_to_jiffies(5);
 498         spin_unlock_irq(&ehci->lock);
 499
 500         ehci_handover_companion_ports(ehci);
 501
 502         /* Now we can safely re-enable irqs */
 503         spin_lock_irq(&ehci->lock);
 504         if (ehci->shutdown)
 505                 goto shutdown;
 506         ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
 507         (void) ehci_readl(ehci, &ehci->regs->intr_enable);
 508         spin_unlock_irq(&ehci->lock);
 509
 510         return 0;
 511
 512  shutdown:
 513         spin_unlock_irq(&ehci->lock);
 514         return -ESHUTDOWN;
 515 }
 516
 517 static unsigned long ehci_get_resuming_ports(struct usb_hcd *hcd)
 518 {
 519         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
 520
 521         return ehci->resuming_ports;
 522 }
 523
 524 #else
 525
 526 #define ehci_bus_suspend        NULL
 527 #define ehci_bus_resume         NULL
 528 #define ehci_get_resuming_ports NULL
 529
 530 #endif  /* CONFIG_PM */
 531
 532 /*-------------------------------------------------------------------------*/
 533
 534 /*
 535  * Sets the owner of a port
 536  */
 537 static void set_owner(struct ehci_hcd *ehci, int portnum, int new_owner)
 538 {
 539         u32 __iomem             *status_reg;
 540         u32                     port_status;
 541         int                     try;
 542
 543         status_reg = &ehci->regs->port_status[portnum];
 544
 545         /*
 546          * The controller won't set the OWNER bit if the port is
 547          * enabled, so this loop will sometimes require at least two
 548          * iterations: one to disable the port and one to set OWNER.
 549          */
 550         for (try = 4; try > 0; --try) {
 551                 spin_lock_irq(&ehci->lock);
 552                 port_status = ehci_readl(ehci, status_reg);
 553                 if ((port_status & PORT_OWNER) == new_owner
 554                                 || (port_status & (PORT_OWNER | PORT_CONNECT))
 555                                         == 0)
 556                         try = 0;
 557                 else {
 558                         port_status ^= PORT_OWNER;
 559                         port_status &= ~(PORT_PE | PORT_RWC_BITS);
 560                         ehci_writel(ehci, port_status, status_reg);
 561                 }
 562                 spin_unlock_irq(&ehci->lock);
 563                 if (try > 1)
 564                         msleep(5);
 565         }
 566 }
 567
 568 /*-------------------------------------------------------------------------*/
 569
 570 static int check_reset_complete (
 571         struct ehci_hcd *ehci,
 572         int             index,
 573         u32 __iomem     *status_reg,
 574         int             port_status
 575 ) {
 576         if (!(port_status & PORT_CONNECT))
 577                 return port_status;
 578
 579         /* if reset finished and it's still not enabled -- handoff */
 580         if (!(port_status & PORT_PE)) {
 581
 582                 /* with integrated TT, there's nobody to hand it to! */
 583                 if (ehci_is_TDI(ehci)) {
 584                         ehci_dbg (ehci,
 585                                 "Failed to enable port %d on root hub TT\n",
 586                                 index+1);
 587                         return port_status;
 588                 }
 589
 590                 ehci_dbg (ehci, "port %d full speed --> companion\n",
 591                         index + 1);
 592
 593                 // what happens if HCS_N_CC(params) == 0 ?
 594                 port_status |= PORT_OWNER;
 595                 port_status &= ~PORT_RWC_BITS;
 596                 ehci_writel(ehci, port_status, status_reg);
 597
 598                 /* ensure 440EPX ohci controller state is operational */
 599                 if (ehci->has_amcc_usb23)
 600                         set_ohci_hcfs(ehci, 1);
 601         } else {
 602                 ehci_dbg(ehci, "port %d reset complete, port enabled\n",
 603                         index + 1);
 604                 /* ensure 440EPx ohci controller state is suspended */
 605                 if (ehci->has_amcc_usb23)
 606                         set_ohci_hcfs(ehci, 0);
 607         }
 608
 609         return port_status;
 610 }
 611
 612 /*-------------------------------------------------------------------------*/
 613
 614
 615 /* build "status change" packet (one or two bytes) from HC registers */
 616
 617 static int
 618 ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
 619 {
 620         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 621         u32             temp, status;
 622         u32             mask;
 623         int             ports, i, retval = 1;
 624         unsigned long   flags;
 625         u32             ppcd = ~0;
 626
 627         /* init status to no-changes */
 628         buf [0] = 0;
 629         ports = HCS_N_PORTS (ehci->hcs_params);
 630         if (ports > 7) {
 631                 buf [1] = 0;
 632                 retval++;
 633         }
 634
 635         /* Inform the core about resumes-in-progress by returning
 636          * a non-zero value even if there are no status changes.
 637          */
 638         status = ehci->resuming_ports;
 639
 640         /* Some boards (mostly VIA?) report bogus overcurrent indications,
 641          * causing massive log spam unless we completely ignore them.  It
 642          * may be relevant that VIA VT8235 controllers, where PORT_POWER is
 643          * always set, seem to clear PORT_OCC and PORT_CSC when writing to
 644          * PORT_POWER; that's surprising, but maybe within-spec.
 645          */
 646         if (!ignore_oc)
 647                 mask = PORT_CSC | PORT_PEC | PORT_OCC;
 648         else
 649                 mask = PORT_CSC | PORT_PEC;
 650         // PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
 651
 652         /* no hub change reports (bit 0) for now (power, ...) */
 653
 654         /* port N changes (bit N)? */
 655         spin_lock_irqsave (&ehci->lock, flags);
 656
 657         /* get per-port change detect bits */
 658         if (ehci->has_ppcd)
 659                 ppcd = ehci_readl(ehci, &ehci->regs->status) >> 16;
 660
 661         for (i = 0; i < ports; i++) {
 662                 /* leverage per-port change bits feature */
 663                 if (ppcd & (1 << i))
 664                         temp = ehci_readl(ehci, &ehci->regs->port_status[i]);
 665                 else
 666                         temp = 0;
 667
 668                 /*
 669                  * Return status information even for ports with OWNER set.
 670                  * Otherwise hub_wq wouldn't see the disconnect event when a
 671                  * high-speed device is switched over to the companion
 672                  * controller by the user.
 673                  */
 674
 675                 if ((temp & mask) != 0 || test_bit(i, &ehci->port_c_suspend)
 676                                 || (ehci->reset_done[i] && time_after_eq(
 677                                         jiffies, ehci->reset_done[i]))) {
 678                         if (i < 7)
 679                             buf [0] |= 1 << (i + 1);
 680                         else
 681                             buf [1] |= 1 << (i - 7);
 682                         status = STS_PCD;
 683                 }
 684         }
 685
 686         /* If a resume is in progress, make sure it can finish */
 687         if (ehci->resuming_ports)
 688                 mod_timer(&hcd->rh_timer, jiffies + msecs_to_jiffies(25));
 689
 690         spin_unlock_irqrestore (&ehci->lock, flags);
 691         return status ? retval : 0;
 692 }
 693
 694 /*-------------------------------------------------------------------------*/
 695
 696 static void
 697 ehci_hub_descriptor (
 698         struct ehci_hcd                 *ehci,
 699         struct usb_hub_descriptor       *desc
 700 ) {
 701         int             ports = HCS_N_PORTS (ehci->hcs_params);
 702         u16             temp;
 703
 704         desc->bDescriptorType = USB_DT_HUB;
 705         desc->bPwrOn2PwrGood = 10;      /* ehci 1.0, 2.3.9 says 20ms max */
 706         desc->bHubContrCurrent = 0;
 707
 708         desc->bNbrPorts = ports;
 709         temp = 1 + (ports / 8);
 710         desc->bDescLength = 7 + 2 * temp;
 711
 712         /* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
 713         memset(&desc->u.hs.DeviceRemovable[0], 0, temp);
 714         memset(&desc->u.hs.DeviceRemovable[temp], 0xff, temp);
 715
 716         temp = HUB_CHAR_INDV_PORT_OCPM; /* per-port overcurrent reporting */
 717         if (HCS_PPC (ehci->hcs_params))
 718                 temp |= HUB_CHAR_INDV_PORT_LPSM; /* per-port power control */
 719         else
 720                 temp |= HUB_CHAR_NO_LPSM; /* no power switching */
 721 #if 0
 722 // re-enable when we support USB_PORT_FEAT_INDICATOR below.
 723         if (HCS_INDICATOR (ehci->hcs_params))
 724                 temp |= HUB_CHAR_PORTIND; /* per-port indicators (LEDs) */
 725 #endif
 726         desc->wHubCharacteristics = cpu_to_le16(temp);
 727 }
 728
 729 /*-------------------------------------------------------------------------*/
 730 #ifdef CONFIG_USB_HCD_TEST_MODE
 731
 732 #define EHSET_TEST_SINGLE_STEP_SET_FEATURE 0x06
 733
 734 static void usb_ehset_completion(struct urb *urb)
 735 {
 736         struct completion  *done = urb->context;
 737
 738         complete(done);
 739 }
 740 static int submit_single_step_set_feature(
 741         struct usb_hcd  *hcd,
 742         struct urb      *urb,
 743         int             is_setup
 744 );
 745
 746 /*
 747  * Allocate and initialize a control URB. This request will be used by the
 748  * EHSET SINGLE_STEP_SET_FEATURE test in which the DATA and STATUS stages
 749  * of the GetDescriptor request are sent 15 seconds after the SETUP stage.
 750  * Return NULL if failed.
 751  */
 752 static struct urb *request_single_step_set_feature_urb(
 753         struct usb_device       *udev,
 754         void                    *dr,
 755         void                    *buf,
 756         struct completion       *done
 757 ) {
 758         struct urb *urb;
 759         struct usb_hcd *hcd = bus_to_hcd(udev->bus);
 760         struct usb_host_endpoint *ep;
 761
 762         urb = usb_alloc_urb(0, GFP_KERNEL);
 763         if (!urb)
 764                 return NULL;
 765
 766         urb->pipe = usb_rcvctrlpipe(udev, 0);
 767         ep = (usb_pipein(urb->pipe) ? udev->ep_in : udev->ep_out)
 768                                 [usb_pipeendpoint(urb->pipe)];
 769         if (!ep) {
 770                 usb_free_urb(urb);
 771                 return NULL;
 772         }
 773
 774         urb->ep = ep;
 775         urb->dev = udev;
 776         urb->setup_packet = (void *)dr;
 777         urb->transfer_buffer = buf;
 778         urb->transfer_buffer_length = USB_DT_DEVICE_SIZE;
 779         urb->complete = usb_ehset_completion;
 780         urb->status = -EINPROGRESS;
 781         urb->actual_length = 0;
 782         urb->transfer_flags = URB_DIR_IN;
 783         usb_get_urb(urb);
 784         atomic_inc(&urb->use_count);
 785         atomic_inc(&urb->dev->urbnum);
 786         urb->setup_dma = dma_map_single(
 787                         hcd->self.sysdev,
 788                         urb->setup_packet,
 789                         sizeof(struct usb_ctrlrequest),
 790                         DMA_TO_DEVICE);
 791         urb->transfer_dma = dma_map_single(
 792                         hcd->self.sysdev,
 793                         urb->transfer_buffer,
 794                         urb->transfer_buffer_length,
 795                         DMA_FROM_DEVICE);
 796         urb->context = done;
 797         return urb;
 798 }
 799
 800 static int ehset_single_step_set_feature(struct usb_hcd *hcd, int port)
 801 {
 802         int retval = -ENOMEM;
 803         struct usb_ctrlrequest *dr;
 804         struct urb *urb;
 805         struct usb_device *udev;
 806         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 807         struct usb_device_descriptor *buf;
 808         DECLARE_COMPLETION_ONSTACK(done);
 809
 810         /* Obtain udev of the rhub's child port */
 811         udev = usb_hub_find_child(hcd->self.root_hub, port);
 812         if (!udev) {
 813                 ehci_err(ehci, "No device attached to the RootHub\n");
 814                 return -ENODEV;
 815         }
 816         buf = kmalloc(USB_DT_DEVICE_SIZE, GFP_KERNEL);
 817         if (!buf)
 818                 return -ENOMEM;
 819
 820         dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
 821         if (!dr) {
 822                 kfree(buf);
 823                 return -ENOMEM;
 824         }
 825
 826         /* Fill Setup packet for GetDescriptor */
 827         dr->bRequestType = USB_DIR_IN;
 828         dr->bRequest = USB_REQ_GET_DESCRIPTOR;
 829         dr->wValue = cpu_to_le16(USB_DT_DEVICE << 8);
 830         dr->wIndex = 0;
 831         dr->wLength = cpu_to_le16(USB_DT_DEVICE_SIZE);
 832         urb = request_single_step_set_feature_urb(udev, dr, buf, &done);
 833         if (!urb)
 834                 goto cleanup;
 835
 836         /* Submit just the SETUP stage */
 837         retval = submit_single_step_set_feature(hcd, urb, 1);
 838         if (retval)
 839                 goto out1;
 840         if (!wait_for_completion_timeout(&done, msecs_to_jiffies(2000))) {
 841                 usb_kill_urb(urb);
 842                 retval = -ETIMEDOUT;
 843                 ehci_err(ehci, "%s SETUP stage timed out on ep0\n", __func__);
 844                 goto out1;
 845         }
 846         msleep(15 * 1000);
 847
 848         /* Complete remaining DATA and STATUS stages using the same URB */
 849         urb->status = -EINPROGRESS;
 850         usb_get_urb(urb);
 851         atomic_inc(&urb->use_count);
 852         atomic_inc(&urb->dev->urbnum);
 853         retval = submit_single_step_set_feature(hcd, urb, 0);
 854         if (!retval && !wait_for_completion_timeout(&done,
 855                                                 msecs_to_jiffies(2000))) {
 856                 usb_kill_urb(urb);
 857                 retval = -ETIMEDOUT;
 858                 ehci_err(ehci, "%s IN stage timed out on ep0\n", __func__);
 859         }
 860 out1:
 861         usb_free_urb(urb);
 862 cleanup:
 863         kfree(dr);
 864         kfree(buf);
 865         return retval;
 866 }
 867 #endif /* CONFIG_USB_HCD_TEST_MODE */
 868 /*-------------------------------------------------------------------------*/
 869
 870 int ehci_hub_control(
 871         struct usb_hcd  *hcd,
 872         u16             typeReq,
 873         u16             wValue,
 874         u16             wIndex,
 875         char            *buf,
 876         u16             wLength
 877 ) {
 878         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 879         int             ports = HCS_N_PORTS (ehci->hcs_params);
 880         u32 __iomem     *status_reg, *hostpc_reg;
 881         u32             temp, temp1, status;
 882         unsigned long   flags;
 883         int             retval = 0;
 884         unsigned        selector;
 885
 886         /*
 887          * Avoid underflow while calculating (wIndex & 0xff) - 1.
 888          * The compiler might deduce that wIndex can never be 0 and then
 889          * optimize away the tests for !wIndex below.
 890          */
 891         temp = wIndex & 0xff;
 892         temp -= (temp > 0);
 893         status_reg = &ehci->regs->port_status[temp];
 894         hostpc_reg = &ehci->regs->hostpc[temp];
 895
 896         /*
 897          * FIXME:  support SetPortFeatures USB_PORT_FEAT_INDICATOR.
 898          * HCS_INDICATOR may say we can change LEDs to off/amber/green.
 899          * (track current state ourselves) ... blink for diagnostics,
 900          * power, "this is the one", etc.  EHCI spec supports this.
 901          */
 902
 903         spin_lock_irqsave (&ehci->lock, flags);
 904         switch (typeReq) {
 905         case ClearHubFeature:
 906                 switch (wValue) {
 907                 case C_HUB_LOCAL_POWER:
 908                 case C_HUB_OVER_CURRENT:
 909                         /* no hub-wide feature/status flags */
 910                         break;
 911                 default:
 912                         goto error;
 913                 }
 914                 break;
 915         case ClearPortFeature:
 916                 if (!wIndex || wIndex > ports)
 917                         goto error;
 918                 wIndex--;
 919                 temp = ehci_readl(ehci, status_reg);
 920                 temp &= ~PORT_RWC_BITS;
 921
 922                 /*
 923                  * Even if OWNER is set, so the port is owned by the
 924                  * companion controller, hub_wq needs to be able to clear
 925                  * the port-change status bits (especially
 926                  * USB_PORT_STAT_C_CONNECTION).
 927                  */
 928
 929                 switch (wValue) {
 930                 case USB_PORT_FEAT_ENABLE:
 931                         ehci_writel(ehci, temp & ~PORT_PE, status_reg);
 932                         break;
 933                 case USB_PORT_FEAT_C_ENABLE:
 934                         ehci_writel(ehci, temp | PORT_PEC, status_reg);
 935                         break;
 936                 case USB_PORT_FEAT_SUSPEND:
 937                         if (temp & PORT_RESET)
 938                                 goto error;
 939                         if (ehci->no_selective_suspend)
 940                                 break;
 941 #ifdef CONFIG_USB_OTG
 942                         if ((hcd->self.otg_port == (wIndex + 1))
 943                             && hcd->self.b_hnp_enable) {
 944                                 otg_start_hnp(hcd->usb_phy->otg);
 945                                 break;
 946                         }
 947 #endif
 948                         if (!(temp & PORT_SUSPEND))
 949                                 break;
 950                         if ((temp & PORT_PE) == 0)
 951                                 goto error;
 952
 953                         /* clear phy low-power mode before resume */
 954                         if (ehci->has_tdi_phy_lpm) {
 955                                 temp1 = ehci_readl(ehci, hostpc_reg);
 956                                 ehci_writel(ehci, temp1 & ~HOSTPC_PHCD,
 957                                                 hostpc_reg);
 958                                 spin_unlock_irqrestore(&ehci->lock, flags);
 959                                 msleep(5);/* wait to leave low-power mode */
 960                                 spin_lock_irqsave(&ehci->lock, flags);
 961                         }
 962                         /* resume signaling for 20 msec */
 963                         temp &= ~PORT_WAKE_BITS;
 964                         ehci_writel(ehci, temp | PORT_RESUME, status_reg);
 965                         ehci->reset_done[wIndex] = jiffies
 966                                         + msecs_to_jiffies(USB_RESUME_TIMEOUT);
 967                         set_bit(wIndex, &ehci->resuming_ports);
 968                         usb_hcd_start_port_resume(&hcd->self, wIndex);
 969                         break;
 970                 case USB_PORT_FEAT_C_SUSPEND:
 971                         clear_bit(wIndex, &ehci->port_c_suspend);
 972                         break;
 973                 case USB_PORT_FEAT_POWER:
 974                         if (HCS_PPC(ehci->hcs_params)) {
 975                                 spin_unlock_irqrestore(&ehci->lock, flags);
 976                                 ehci_port_power(ehci, wIndex, false);
 977                                 spin_lock_irqsave(&ehci->lock, flags);
 978                         }
 979                         break;
 980                 case USB_PORT_FEAT_C_CONNECTION:
 981                         ehci_writel(ehci, temp | PORT_CSC, status_reg);
 982                         break;
 983                 case USB_PORT_FEAT_C_OVER_CURRENT:
 984                         ehci_writel(ehci, temp | PORT_OCC, status_reg);
 985                         break;
 986                 case USB_PORT_FEAT_C_RESET:
 987                         /* GetPortStatus clears reset */
 988                         break;
 989                 default:
 990                         goto error;
 991                 }
 992                 ehci_readl(ehci, &ehci->regs->command); /* unblock posted write */
 993                 break;
 994         case GetHubDescriptor:
 995                 ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
 996                         buf);
 997                 break;
 998         case GetHubStatus:
 999                 /* no hub-wide feature/status flags */
1000                 memset (buf, 0, 4);
1001                 //cpu_to_le32s ((u32 *) buf);
1002                 break;
1003         case GetPortStatus:
1004                 if (!wIndex || wIndex > ports)
1005                         goto error;
1006                 wIndex--;
1007                 status = 0;
1008                 temp = ehci_readl(ehci, status_reg);
1009
1010                 // wPortChange bits
1011                 if (temp & PORT_CSC)
1012                         status |= USB_PORT_STAT_C_CONNECTION << 16;
1013                 if (temp & PORT_PEC)
1014                         status |= USB_PORT_STAT_C_ENABLE << 16;
1015
1016                 if ((temp & PORT_OCC) && !ignore_oc){
1017                         status |= USB_PORT_STAT_C_OVERCURRENT << 16;
1018
1019                         /*
1020                          * Hubs should disable port power on over-current.
1021                          * However, not all EHCI implementations do this
1022                          * automatically, even if they _do_ support per-port
1023                          * power switching; they're allowed to just limit the
1024                          * current.  hub_wq will turn the power back on.
1025                          */
1026                         if (((temp & PORT_OC) || (ehci->need_oc_pp_cycle))
1027                                         && HCS_PPC(ehci->hcs_params)) {
1028                                 spin_unlock_irqrestore(&ehci->lock, flags);
1029                                 ehci_port_power(ehci, wIndex, false);
1030                                 spin_lock_irqsave(&ehci->lock, flags);
1031                                 temp = ehci_readl(ehci, status_reg);
1032                         }
1033                 }
1034
1035                 /* no reset or resume pending */
1036                 if (!ehci->reset_done[wIndex]) {
1037
1038                         /* Remote Wakeup received? */
1039                         if (temp & PORT_RESUME) {
1040                                 /* resume signaling for 20 msec */
1041                                 ehci->reset_done[wIndex] = jiffies
1042                                                 + msecs_to_jiffies(20);
1043                                 usb_hcd_start_port_resume(&hcd->self, wIndex);
1044                                 set_bit(wIndex, &ehci->resuming_ports);
1045                                 /* check the port again */
1046                                 mod_timer(&ehci_to_hcd(ehci)->rh_timer,
1047                                                 ehci->reset_done[wIndex]);
1048                         }
1049
1050                 /* reset or resume not yet complete */
1051                 } else if (!time_after_eq(jiffies, ehci->reset_done[wIndex])) {
1052                         ;       /* wait until it is complete */
1053
1054                 /* resume completed */
1055                 } else if (test_bit(wIndex, &ehci->resuming_ports)) {
1056                         clear_bit(wIndex, &ehci->suspended_ports);
1057                         set_bit(wIndex, &ehci->port_c_suspend);
1058                         ehci->reset_done[wIndex] = 0;
1059                         usb_hcd_end_port_resume(&hcd->self, wIndex);
1060
1061                         /* stop resume signaling */
1062                         temp &= ~(PORT_RWC_BITS | PORT_SUSPEND | PORT_RESUME);
1063                         ehci_writel(ehci, temp, status_reg);
1064                         clear_bit(wIndex, &ehci->resuming_ports);
1065                         retval = ehci_handshake(ehci, status_reg,
1066                                         PORT_RESUME, 0, 2000 /* 2msec */);
1067                         if (retval != 0) {
1068                                 ehci_err(ehci, "port %d resume error %d\n",
1069                                                 wIndex + 1, retval);
1070                                 goto error;
1071                         }
1072                         temp = ehci_readl(ehci, status_reg);
1073
1074                 /* whoever resets must GetPortStatus to complete it!! */
1075                 } else {
1076                         status |= USB_PORT_STAT_C_RESET << 16;
1077                         ehci->reset_done [wIndex] = 0;
1078
1079                         /* force reset to complete */
1080                         ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESET),
1081                                         status_reg);
1082                         /* REVISIT:  some hardware needs 550+ usec to clear
1083                          * this bit; seems too long to spin routinely...
1084                          */
1085                         retval = ehci_handshake(ehci, status_reg,
1086                                         PORT_RESET, 0, 1000);
1087                         if (retval != 0) {
1088                                 ehci_err (ehci, "port %d reset error %d\n",
1089                                         wIndex + 1, retval);
1090                                 goto error;
1091                         }
1092
1093                         /* see what we found out */
1094                         temp = check_reset_complete (ehci, wIndex, status_reg,
1095                                         ehci_readl(ehci, status_reg));
1096                 }
1097
1098                 /* transfer dedicated ports to the companion hc */
1099                 if ((temp & PORT_CONNECT) &&
1100                                 test_bit(wIndex, &ehci->companion_ports)) {
1101                         temp &= ~PORT_RWC_BITS;
1102                         temp |= PORT_OWNER;
1103                         ehci_writel(ehci, temp, status_reg);
1104                         ehci_dbg(ehci, "port %d --> companion\n", wIndex + 1);
1105                         temp = ehci_readl(ehci, status_reg);
1106                 }
1107
1108                 /*
1109                  * Even if OWNER is set, there's no harm letting hub_wq
1110                  * see the wPortStatus values (they should all be 0 except
1111                  * for PORT_POWER anyway).
1112                  */
1113
1114                 if (temp & PORT_CONNECT) {
1115                         status |= USB_PORT_STAT_CONNECTION;
1116                         // status may be from integrated TT
1117                         if (ehci->has_hostpc) {
1118                                 temp1 = ehci_readl(ehci, hostpc_reg);
1119                                 status |= ehci_port_speed(ehci, temp1);
1120                         } else
1121                                 status |= ehci_port_speed(ehci, temp);
1122                 }
1123                 if (temp & PORT_PE)
1124                         status |= USB_PORT_STAT_ENABLE;
1125
1126                 /* maybe the port was unsuspended without our knowledge */
1127                 if (temp & (PORT_SUSPEND|PORT_RESUME)) {
1128                         status |= USB_PORT_STAT_SUSPEND;
1129                 } else if (test_bit(wIndex, &ehci->suspended_ports)) {
1130                         clear_bit(wIndex, &ehci->suspended_ports);
1131                         clear_bit(wIndex, &ehci->resuming_ports);
1132                         ehci->reset_done[wIndex] = 0;
1133                         if (temp & PORT_PE)
1134                                 set_bit(wIndex, &ehci->port_c_suspend);
1135                         usb_hcd_end_port_resume(&hcd->self, wIndex);
1136                 }
1137
1138                 if (temp & PORT_OC)
1139                         status |= USB_PORT_STAT_OVERCURRENT;
1140                 if (temp & PORT_RESET)
1141                         status |= USB_PORT_STAT_RESET;
1142                 if (temp & PORT_POWER)
1143                         status |= USB_PORT_STAT_POWER;
1144                 if (test_bit(wIndex, &ehci->port_c_suspend))
1145                         status |= USB_PORT_STAT_C_SUSPEND << 16;
1146
1147                 if (status & ~0xffff)   /* only if wPortChange is interesting */
1148                         dbg_port(ehci, "GetStatus", wIndex + 1, temp);
1149                 put_unaligned_le32(status, buf);
1150                 break;
1151         case SetHubFeature:
1152                 switch (wValue) {
1153                 case C_HUB_LOCAL_POWER:
1154                 case C_HUB_OVER_CURRENT:
1155                         /* no hub-wide feature/status flags */
1156                         break;
1157                 default:
1158                         goto error;
1159                 }
1160                 break;
1161         case SetPortFeature:
1162                 selector = wIndex >> 8;
1163                 wIndex &= 0xff;
1164                 if (unlikely(ehci->debug)) {
1165                         /* If the debug port is active any port
1166                          * feature requests should get denied */
1167                         if (wIndex == HCS_DEBUG_PORT(ehci->hcs_params) &&
1168                             (readl(&ehci->debug->control) & DBGP_ENABLED)) {
1169                                 retval = -ENODEV;
1170                                 goto error_exit;
1171                         }
1172                 }
1173                 if (!wIndex || wIndex > ports)
1174                         goto error;
1175                 wIndex--;
1176                 temp = ehci_readl(ehci, status_reg);
1177                 if (temp & PORT_OWNER)
1178                         break;
1179
1180                 temp &= ~PORT_RWC_BITS;
1181                 switch (wValue) {
1182                 case USB_PORT_FEAT_SUSPEND:
1183                         if (ehci->no_selective_suspend)
1184                                 break;
1185                         if ((temp & PORT_PE) == 0
1186                                         || (temp & PORT_RESET) != 0)
1187                                 goto error;
1188
1189                         /* After above check the port must be connected.
1190                          * Set appropriate bit thus could put phy into low power
1191                          * mode if we have tdi_phy_lpm feature
1192                          */
1193                         temp &= ~PORT_WKCONN_E;
1194                         temp |= PORT_WKDISC_E | PORT_WKOC_E;
1195                         ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
1196                         if (ehci->has_tdi_phy_lpm) {
1197                                 spin_unlock_irqrestore(&ehci->lock, flags);
1198                                 msleep(5);/* 5ms for HCD enter low pwr mode */
1199                                 spin_lock_irqsave(&ehci->lock, flags);
1200                                 temp1 = ehci_readl(ehci, hostpc_reg);
1201                                 ehci_writel(ehci, temp1 | HOSTPC_PHCD,
1202                                         hostpc_reg);
1203                                 temp1 = ehci_readl(ehci, hostpc_reg);
1204                                 ehci_dbg(ehci, "Port%d phy low pwr mode %s\n",
1205                                         wIndex, (temp1 & HOSTPC_PHCD) ?
1206                                         "succeeded" : "failed");
1207                         }
1208                         if (ehci_has_fsl_susp_errata(ehci)) {
1209                                 /* 10ms for HCD enter suspend */
1210                                 spin_unlock_irqrestore(&ehci->lock, flags);
1211                                 usleep_range(10000, 20000);
1212                                 spin_lock_irqsave(&ehci->lock, flags);
1213                         }
1214                         set_bit(wIndex, &ehci->suspended_ports);
1215                         break;
1216                 case USB_PORT_FEAT_POWER:
1217                         if (HCS_PPC(ehci->hcs_params)) {
1218                                 spin_unlock_irqrestore(&ehci->lock, flags);
1219                                 ehci_port_power(ehci, wIndex, true);
1220                                 spin_lock_irqsave(&ehci->lock, flags);
1221                         }
1222                         break;
1223                 case USB_PORT_FEAT_RESET:
1224                         if (temp & (PORT_SUSPEND|PORT_RESUME))
1225                                 goto error;
1226                         /* line status bits may report this as low speed,
1227                          * which can be fine if this root hub has a
1228                          * transaction translator built in.
1229                          */
1230                         if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
1231                                         && !ehci_is_TDI(ehci)
1232                                         && PORT_USB11 (temp)) {
1233                                 ehci_dbg (ehci,
1234                                         "port %d low speed --> companion\n",
1235                                         wIndex + 1);
1236                                 temp |= PORT_OWNER;
1237                         } else {
1238                                 temp |= PORT_RESET;
1239                                 temp &= ~PORT_PE;
1240
1241                                 /*
1242                                  * caller must wait, then call GetPortStatus
1243                                  * usb 2.0 spec says 50 ms resets on root
1244                                  */
1245                                 ehci->reset_done [wIndex] = jiffies
1246                                                 + msecs_to_jiffies (50);
1247
1248                                 /*
1249                                  * Force full-speed connect for FSL high-speed
1250                                  * erratum; disable HS Chirp by setting PFSC bit
1251                                  */
1252                                 if (ehci_has_fsl_hs_errata(ehci))
1253                                         temp |= (1 << PORTSC_FSL_PFSC);
1254                         }
1255                         ehci_writel(ehci, temp, status_reg);
1256                         break;
1257
1258                 /* For downstream facing ports (these):  one hub port is put
1259                  * into test mode according to USB2 11.24.2.13, then the hub
1260                  * must be reset (which for root hub now means rmmod+modprobe,
1261                  * or else system reboot).  See EHCI 2.3.9 and 4.14 for info
1262                  * about the EHCI-specific stuff.
1263                  */
1264                 case USB_PORT_FEAT_TEST:
1265 #ifdef CONFIG_USB_HCD_TEST_MODE
1266                         if (selector == EHSET_TEST_SINGLE_STEP_SET_FEATURE) {
1267                                 spin_unlock_irqrestore(&ehci->lock, flags);
1268                                 retval = ehset_single_step_set_feature(hcd,
1269                                                                 wIndex + 1);
1270                                 spin_lock_irqsave(&ehci->lock, flags);
1271                                 break;
1272                         }
1273 #endif
1274                         if (!selector || selector > 5)
1275                                 goto error;
1276                         spin_unlock_irqrestore(&ehci->lock, flags);
1277                         ehci_quiesce(ehci);
1278                         spin_lock_irqsave(&ehci->lock, flags);
1279
1280                         /* Put all enabled ports into suspend */
1281                         while (ports--) {
1282                                 u32 __iomem *sreg =
1283                                                 &ehci->regs->port_status[ports];
1284
1285                                 temp = ehci_readl(ehci, sreg) & ~PORT_RWC_BITS;
1286                                 if (temp & PORT_PE)
1287                                         ehci_writel(ehci, temp | PORT_SUSPEND,
1288                                                         sreg);
1289                         }
1290
1291                         spin_unlock_irqrestore(&ehci->lock, flags);
1292                         ehci_halt(ehci);
1293                         spin_lock_irqsave(&ehci->lock, flags);
1294
1295                         temp = ehci_readl(ehci, status_reg);
1296                         temp |= selector << 16;
1297                         ehci_writel(ehci, temp, status_reg);
1298                         break;
1299
1300                 default:
1301                         goto error;
1302                 }
1303                 ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
1304                 break;
1305
1306         default:
1307 error:
1308                 /* "stall" on error */
1309                 retval = -EPIPE;
1310         }
1311 error_exit:
1312         spin_unlock_irqrestore (&ehci->lock, flags);
1313         return retval;
1314 }
1315 EXPORT_SYMBOL_GPL(ehci_hub_control);
1316
1317 static void ehci_relinquish_port(struct usb_hcd *hcd, int portnum)
1318 {
1319         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1320
1321         if (ehci_is_TDI(ehci))
1322                 return;
1323         set_owner(ehci, --portnum, PORT_OWNER);
1324 }
1325
1326 static int ehci_port_handed_over(struct usb_hcd *hcd, int portnum)
1327 {
1328         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1329         u32 __iomem             *reg;
1330
1331         if (ehci_is_TDI(ehci))
1332                 return 0;
1333         reg = &ehci->regs->port_status[portnum - 1];
1334         return ehci_readl(ehci, reg) & PORT_OWNER;
1335 }
1336
1337 static int ehci_port_power(struct ehci_hcd *ehci, int portnum, bool enable)
1338 {
1339         struct usb_hcd *hcd = ehci_to_hcd(ehci);
1340         u32 __iomem *status_reg = &ehci->regs->port_status[portnum];
1341         u32 temp = ehci_readl(ehci, status_reg) & ~PORT_RWC_BITS;
1342
1343         if (enable)
1344                 ehci_writel(ehci, temp | PORT_POWER, status_reg);
1345         else
1346                 ehci_writel(ehci, temp & ~PORT_POWER, status_reg);
1347
1348         if (hcd->driver->port_power)
1349                 hcd->driver->port_power(hcd, portnum, enable);
1350
1351         return 0;
1352 }