kernel/drivers/usb/host/ehci-hub.c

   1 /*
   2  * Copyright (C) 2001-2004 by David Brownell
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License as published by the
   6  * Free Software Foundation; either version 2 of the License, or (at your
   7  * option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  11  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software Foundation,
  16  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17  */
  18
  19 /* this file is part of ehci-hcd.c */
  20
  21 /*-------------------------------------------------------------------------*/
  22
  23 /*
  24  * EHCI Root Hub ... the nonsharable stuff
  25  *
  26  * Registers don't need cpu_to_le32, that happens transparently
  27  */
  28
  29 /*-------------------------------------------------------------------------*/
  30 #include <linux/usb/otg.h>
  31
  32 #define PORT_WAKE_BITS  (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
  33
  34 #ifdef  CONFIG_PM
  35
  36 static int persist_enabled_on_companion(struct usb_device *udev, void *unused)
  37 {
  38         return !udev->maxchild && udev->persist_enabled &&
  39                 udev->bus->root_hub->speed < USB_SPEED_HIGH;
  40 }
  41
  42 /* After a power loss, ports that were owned by the companion must be
  43  * reset so that the companion can still own them.
  44  */
  45 static void ehci_handover_companion_ports(struct ehci_hcd *ehci)
  46 {
  47         u32 __iomem     *reg;
  48         u32             status;
  49         int             port;
  50         __le32          buf;
  51         struct usb_hcd  *hcd = ehci_to_hcd(ehci);
  52
  53         if (!ehci->owned_ports)
  54                 return;
  55
  56         /*
  57          * USB 1.1 devices are mostly HIDs, which don't need to persist across
  58          * suspends. If we ensure that none of our companion's devices have
  59          * persist_enabled (by looking through all USB 1.1 buses in the system),
  60          * we can skip this and avoid slowing resume down. Devices without
  61          * persist will just get reenumerated shortly after resume anyway.
  62          */
  63         if (!usb_for_each_dev(NULL, persist_enabled_on_companion))
  64                 return;
  65
  66         /* Make sure the ports are powered */
  67         port = HCS_N_PORTS(ehci->hcs_params);
  68         while (port--) {
  69                 if (test_bit(port, &ehci->owned_ports)) {
  70                         reg = &ehci->regs->port_status[port];
  71                         status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
  72                         if (!(status & PORT_POWER))
  73                                 ehci_port_power(ehci, port, true);
  74                 }
  75         }
  76
  77         /* Give the connections some time to appear */
  78         msleep(20);
  79
  80         spin_lock_irq(&ehci->lock);
  81         port = HCS_N_PORTS(ehci->hcs_params);
  82         while (port--) {
  83                 if (test_bit(port, &ehci->owned_ports)) {
  84                         reg = &ehci->regs->port_status[port];
  85                         status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
  86
  87                         /* Port already owned by companion? */
  88                         if (status & PORT_OWNER)
  89                                 clear_bit(port, &ehci->owned_ports);
  90                         else if (test_bit(port, &ehci->companion_ports))
  91                                 ehci_writel(ehci, status & ~PORT_PE, reg);
  92                         else {
  93                                 spin_unlock_irq(&ehci->lock);
  94                                 ehci_hub_control(hcd, SetPortFeature,
  95                                                 USB_PORT_FEAT_RESET, port + 1,
  96                                                 NULL, 0);
  97                                 spin_lock_irq(&ehci->lock);
  98                         }
  99                 }
 100         }
 101         spin_unlock_irq(&ehci->lock);
 102
 103         if (!ehci->owned_ports)
 104                 return;
 105         msleep(90);             /* Wait for resets to complete */
 106
 107         spin_lock_irq(&ehci->lock);
 108         port = HCS_N_PORTS(ehci->hcs_params);
 109         while (port--) {
 110                 if (test_bit(port, &ehci->owned_ports)) {
 111                         spin_unlock_irq(&ehci->lock);
 112                         ehci_hub_control(hcd, GetPortStatus,
 113                                         0, port + 1,
 114                                         (char *) &buf, sizeof(buf));
 115                         spin_lock_irq(&ehci->lock);
 116
 117                         /* The companion should now own the port,
 118                          * but if something went wrong the port must not
 119                          * remain enabled.
 120                          */
 121                         reg = &ehci->regs->port_status[port];
 122                         status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
 123                         if (status & PORT_OWNER)
 124                                 ehci_writel(ehci, status | PORT_CSC, reg);
 125                         else {
 126                                 ehci_dbg(ehci, "failed handover port %d: %x\n",
 127                                                 port + 1, status);
 128                                 ehci_writel(ehci, status & ~PORT_PE, reg);
 129                         }
 130                 }
 131         }
 132
 133         ehci->owned_ports = 0;
 134         spin_unlock_irq(&ehci->lock);
 135 }
 136
 137 static int ehci_port_change(struct ehci_hcd *ehci)
 138 {
 139         int i = HCS_N_PORTS(ehci->hcs_params);
 140
 141         /* First check if the controller indicates a change event */
 142
 143         if (ehci_readl(ehci, &ehci->regs->status) & STS_PCD)
 144                 return 1;
 145
 146         /*
 147          * Not all controllers appear to update this while going from D3 to D0,
 148          * so check the individual port status registers as well
 149          */
 150
 151         while (i--)
 152                 if (ehci_readl(ehci, &ehci->regs->port_status[i]) & PORT_CSC)
 153                         return 1;
 154
 155         return 0;
 156 }
 157
 158 void ehci_adjust_port_wakeup_flags(struct ehci_hcd *ehci,
 159                 bool suspending, bool do_wakeup)
 160 {
 161         int             port;
 162         u32             temp;
 163
 164         /* If remote wakeup is enabled for the root hub but disabled
 165          * for the controller, we must adjust all the port wakeup flags
 166          * when the controller is suspended or resumed.  In all other
 167          * cases they don't need to be changed.
 168          */
 169         if (!ehci_to_hcd(ehci)->self.root_hub->do_remote_wakeup || do_wakeup)
 170                 return;
 171
 172         spin_lock_irq(&ehci->lock);
 173
 174         /* clear phy low-power mode before changing wakeup flags */
 175         if (ehci->has_tdi_phy_lpm) {
 176                 port = HCS_N_PORTS(ehci->hcs_params);
 177                 while (port--) {
 178                         u32 __iomem     *hostpc_reg = &ehci->regs->hostpc[port];
 179
 180                         temp = ehci_readl(ehci, hostpc_reg);
 181                         ehci_writel(ehci, temp & ~HOSTPC_PHCD, hostpc_reg);
 182                 }
 183                 spin_unlock_irq(&ehci->lock);
 184                 msleep(5);
 185                 spin_lock_irq(&ehci->lock);
 186         }
 187
 188         port = HCS_N_PORTS(ehci->hcs_params);
 189         while (port--) {
 190                 u32 __iomem     *reg = &ehci->regs->port_status[port];
 191                 u32             t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
 192                 u32             t2 = t1 & ~PORT_WAKE_BITS;
 193
 194                 /* If we are suspending the controller, clear the flags.
 195                  * If we are resuming the controller, set the wakeup flags.
 196                  */
 197                 if (!suspending) {
 198                         if (t1 & PORT_CONNECT)
 199                                 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
 200                         else
 201                                 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
 202                 }
 203                 ehci_writel(ehci, t2, reg);
 204         }
 205
 206         /* enter phy low-power mode again */
 207         if (ehci->has_tdi_phy_lpm) {
 208                 port = HCS_N_PORTS(ehci->hcs_params);
 209                 while (port--) {
 210                         u32 __iomem     *hostpc_reg = &ehci->regs->hostpc[port];
 211
 212                         temp = ehci_readl(ehci, hostpc_reg);
 213                         ehci_writel(ehci, temp | HOSTPC_PHCD, hostpc_reg);
 214                 }
 215         }
 216
 217         /* Does the root hub have a port wakeup pending? */
 218         if (!suspending && ehci_port_change(ehci))
 219                 usb_hcd_resume_root_hub(ehci_to_hcd(ehci));
 220
 221         spin_unlock_irq(&ehci->lock);
 222 }
 223 EXPORT_SYMBOL_GPL(ehci_adjust_port_wakeup_flags);
 224
 225 static int ehci_bus_suspend (struct usb_hcd *hcd)
 226 {
 227         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 228         int                     port;
 229         int                     mask;
 230         int                     changed;
 231         bool                    fs_idle_delay;
 232
 233         ehci_dbg(ehci, "suspend root hub\n");
 234
 235         if (time_before (jiffies, ehci->next_statechange))
 236                 msleep(5);
 237
 238         /* stop the schedules */
 239         ehci_quiesce(ehci);
 240
 241         spin_lock_irq (&ehci->lock);
 242         if (ehci->rh_state < EHCI_RH_RUNNING)
 243                 goto done;
 244
 245         /* Once the controller is stopped, port resumes that are already
 246          * in progress won't complete.  Hence if remote wakeup is enabled
 247          * for the root hub and any ports are in the middle of a resume or
 248          * remote wakeup, we must fail the suspend.
 249          */
 250         if (hcd->self.root_hub->do_remote_wakeup) {
 251                 if (ehci->resuming_ports) {
 252                         spin_unlock_irq(&ehci->lock);
 253                         ehci_dbg(ehci, "suspend failed because a port is resuming\n");
 254                         return -EBUSY;
 255                 }
 256         }
 257
 258         /* Unlike other USB host controller types, EHCI doesn't have
 259          * any notion of "global" or bus-wide suspend.  The driver has
 260          * to manually suspend all the active unsuspended ports, and
 261          * then manually resume them in the bus_resume() routine.
 262          */
 263         ehci->bus_suspended = 0;
 264         ehci->owned_ports = 0;
 265         changed = 0;
 266         fs_idle_delay = false;
 267         port = HCS_N_PORTS(ehci->hcs_params);
 268         while (port--) {
 269                 u32 __iomem     *reg = &ehci->regs->port_status [port];
 270                 u32             t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
 271                 u32             t2 = t1 & ~PORT_WAKE_BITS;
 272
 273                 /* keep track of which ports we suspend */
 274                 if (t1 & PORT_OWNER)
 275                         set_bit(port, &ehci->owned_ports);
 276                 else if ((t1 & PORT_PE) && !(t1 & PORT_SUSPEND)) {
 277                         t2 |= PORT_SUSPEND;
 278                         set_bit(port, &ehci->bus_suspended);
 279                 }
 280
 281                 /* enable remote wakeup on all ports, if told to do so */
 282                 if (hcd->self.root_hub->do_remote_wakeup) {
 283                         /* only enable appropriate wake bits, otherwise the
 284                          * hardware can not go phy low power mode. If a race
 285                          * condition happens here(connection change during bits
 286                          * set), the port change detection will finally fix it.
 287                          */
 288                         if (t1 & PORT_CONNECT)
 289                                 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
 290                         else
 291                                 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
 292                 }
 293
 294                 if (t1 != t2) {
 295                         /*
 296                          * On some controllers, Wake-On-Disconnect will
 297                          * generate false wakeup signals until the bus
 298                          * switches over to full-speed idle.  For their
 299                          * sake, add a delay if we need one.
 300                          */
 301                         if ((t2 & PORT_WKDISC_E) &&
 302                                         ehci_port_speed(ehci, t2) ==
 303                                                 USB_PORT_STAT_HIGH_SPEED)
 304                                 fs_idle_delay = true;
 305                         ehci_writel(ehci, t2, reg);
 306                         changed = 1;
 307                 }
 308         }
 309         spin_unlock_irq(&ehci->lock);
 310
 311         if ((changed && ehci->has_tdi_phy_lpm) || fs_idle_delay) {
 312                 /*
 313                  * Wait for HCD to enter low-power mode or for the bus
 314                  * to switch to full-speed idle.
 315                  */
 316                 usleep_range(5000, 5500);
 317         }
 318
 319         if (changed && ehci->has_tdi_phy_lpm) {
 320                 spin_lock_irq(&ehci->lock);
 321                 port = HCS_N_PORTS(ehci->hcs_params);
 322                 while (port--) {
 323                         u32 __iomem     *hostpc_reg = &ehci->regs->hostpc[port];
 324                         u32             t3;
 325
 326                         t3 = ehci_readl(ehci, hostpc_reg);
 327                         ehci_writel(ehci, t3 | HOSTPC_PHCD, hostpc_reg);
 328                         t3 = ehci_readl(ehci, hostpc_reg);
 329                         ehci_dbg(ehci, "Port %d phy low-power mode %s\n",
 330                                         port, (t3 & HOSTPC_PHCD) ?
 331                                         "succeeded" : "failed");
 332                 }
 333                 spin_unlock_irq(&ehci->lock);
 334         }
 335
 336         /* Apparently some devices need a >= 1-uframe delay here */
 337         if (ehci->bus_suspended)
 338                 udelay(150);
 339
 340         /* turn off now-idle HC */
 341         ehci_halt (ehci);
 342
 343         spin_lock_irq(&ehci->lock);
 344         if (ehci->enabled_hrtimer_events & BIT(EHCI_HRTIMER_POLL_DEAD))
 345                 ehci_handle_controller_death(ehci);
 346         if (ehci->rh_state != EHCI_RH_RUNNING)
 347                 goto done;
 348         ehci->rh_state = EHCI_RH_SUSPENDED;
 349
 350         end_unlink_async(ehci);
 351         unlink_empty_async_suspended(ehci);
 352         ehci_handle_start_intr_unlinks(ehci);
 353         ehci_handle_intr_unlinks(ehci);
 354         end_free_itds(ehci);
 355
 356         /* allow remote wakeup */
 357         mask = INTR_MASK;
 358         if (!hcd->self.root_hub->do_remote_wakeup)
 359                 mask &= ~STS_PCD;
 360         ehci_writel(ehci, mask, &ehci->regs->intr_enable);
 361         ehci_readl(ehci, &ehci->regs->intr_enable);
 362
 363  done:
 364         ehci->next_statechange = jiffies + msecs_to_jiffies(10);
 365         ehci->enabled_hrtimer_events = 0;
 366         ehci->next_hrtimer_event = EHCI_HRTIMER_NO_EVENT;
 367         spin_unlock_irq (&ehci->lock);
 368
 369         hrtimer_cancel(&ehci->hrtimer);
 370         return 0;
 371 }
 372
 373
 374 /* caller has locked the root hub, and should reset/reinit on error */
 375 static int ehci_bus_resume (struct usb_hcd *hcd)
 376 {
 377         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 378         u32                     temp;
 379         u32                     power_okay;
 380         int                     i;
 381         unsigned long           resume_needed = 0;
 382
 383         if (time_before (jiffies, ehci->next_statechange))
 384                 msleep(5);
 385         spin_lock_irq (&ehci->lock);
 386         if (!HCD_HW_ACCESSIBLE(hcd) || ehci->shutdown)
 387                 goto shutdown;
 388
 389         if (unlikely(ehci->debug)) {
 390                 if (!dbgp_reset_prep(hcd))
 391                         ehci->debug = NULL;
 392                 else
 393                         dbgp_external_startup(hcd);
 394         }
 395
 396         /* Ideally and we've got a real resume here, and no port's power
 397          * was lost.  (For PCI, that means Vaux was maintained.)  But we
 398          * could instead be restoring a swsusp snapshot -- so that BIOS was
 399          * the last user of the controller, not reset/pm hardware keeping
 400          * state we gave to it.
 401          */
 402         power_okay = ehci_readl(ehci, &ehci->regs->intr_enable);
 403         ehci_dbg(ehci, "resume root hub%s\n",
 404                         power_okay ? "" : " after power loss");
 405
 406         /* at least some APM implementations will try to deliver
 407          * IRQs right away, so delay them until we're ready.
 408          */
 409         ehci_writel(ehci, 0, &ehci->regs->intr_enable);
 410
 411         /* re-init operational registers */
 412         ehci_writel(ehci, 0, &ehci->regs->segment);
 413         ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
 414         ehci_writel(ehci, (u32) ehci->async->qh_dma, &ehci->regs->async_next);
 415
 416         /* restore CMD_RUN, framelist size, and irq threshold */
 417         ehci->command |= CMD_RUN;
 418         ehci_writel(ehci, ehci->command, &ehci->regs->command);
 419         ehci->rh_state = EHCI_RH_RUNNING;
 420
 421         /*
 422          * According to Bugzilla #8190, the port status for some controllers
 423          * will be wrong without a delay. At their wrong status, the port
 424          * is enabled, but not suspended neither resumed.
 425          */
 426         i = HCS_N_PORTS(ehci->hcs_params);
 427         while (i--) {
 428                 temp = ehci_readl(ehci, &ehci->regs->port_status[i]);
 429                 if ((temp & PORT_PE) &&
 430                                 !(temp & (PORT_SUSPEND | PORT_RESUME))) {
 431                         ehci_dbg(ehci, "Port status(0x%x) is wrong\n", temp);
 432                         spin_unlock_irq(&ehci->lock);
 433                         msleep(8);
 434                         spin_lock_irq(&ehci->lock);
 435                         break;
 436                 }
 437         }
 438
 439         if (ehci->shutdown)
 440                 goto shutdown;
 441
 442         /* clear phy low-power mode before resume */
 443         if (ehci->bus_suspended && ehci->has_tdi_phy_lpm) {
 444                 i = HCS_N_PORTS(ehci->hcs_params);
 445                 while (i--) {
 446                         if (test_bit(i, &ehci->bus_suspended)) {
 447                                 u32 __iomem     *hostpc_reg =
 448                                                         &ehci->regs->hostpc[i];
 449
 450                                 temp = ehci_readl(ehci, hostpc_reg);
 451                                 ehci_writel(ehci, temp & ~HOSTPC_PHCD,
 452                                                 hostpc_reg);
 453                         }
 454                 }
 455                 spin_unlock_irq(&ehci->lock);
 456                 msleep(5);
 457                 spin_lock_irq(&ehci->lock);
 458                 if (ehci->shutdown)
 459                         goto shutdown;
 460         }
 461
 462         /* manually resume the ports we suspended during bus_suspend() */
 463         i = HCS_N_PORTS (ehci->hcs_params);
 464         while (i--) {
 465                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 466                 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
 467                 if (test_bit(i, &ehci->bus_suspended) &&
 468                                 (temp & PORT_SUSPEND)) {
 469                         temp |= PORT_RESUME;
 470                         set_bit(i, &resume_needed);
 471                 }
 472                 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
 473         }
 474
 475         /*
 476          * msleep for USB_RESUME_TIMEOUT ms only if code is trying to resume
 477          * port
 478          */
 479         if (resume_needed) {
 480                 spin_unlock_irq(&ehci->lock);
 481                 msleep(USB_RESUME_TIMEOUT);
 482                 spin_lock_irq(&ehci->lock);
 483                 if (ehci->shutdown)
 484                         goto shutdown;
 485         }
 486
 487         i = HCS_N_PORTS (ehci->hcs_params);
 488         while (i--) {
 489                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 490                 if (test_bit(i, &resume_needed)) {
 491                         temp &= ~(PORT_RWC_BITS | PORT_SUSPEND | PORT_RESUME);
 492                         ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
 493                 }
 494         }
 495
 496         ehci->next_statechange = jiffies + msecs_to_jiffies(5);
 497         spin_unlock_irq(&ehci->lock);
 498
 499         ehci_handover_companion_ports(ehci);
 500
 501         /* Now we can safely re-enable irqs */
 502         spin_lock_irq(&ehci->lock);
 503         if (ehci->shutdown)
 504                 goto shutdown;
 505         ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
 506         (void) ehci_readl(ehci, &ehci->regs->intr_enable);
 507         spin_unlock_irq(&ehci->lock);
 508
 509         return 0;
 510
 511  shutdown:
 512         spin_unlock_irq(&ehci->lock);
 513         return -ESHUTDOWN;
 514 }
 515
 516 #else
 517
 518 #define ehci_bus_suspend        NULL
 519 #define ehci_bus_resume         NULL
 520
 521 #endif  /* CONFIG_PM */
 522
 523 /*-------------------------------------------------------------------------*/
 524
 525 /*
 526  * Sets the owner of a port
 527  */
 528 static void set_owner(struct ehci_hcd *ehci, int portnum, int new_owner)
 529 {
 530         u32 __iomem             *status_reg;
 531         u32                     port_status;
 532         int                     try;
 533
 534         status_reg = &ehci->regs->port_status[portnum];
 535
 536         /*
 537          * The controller won't set the OWNER bit if the port is
 538          * enabled, so this loop will sometimes require at least two
 539          * iterations: one to disable the port and one to set OWNER.
 540          */
 541         for (try = 4; try > 0; --try) {
 542                 spin_lock_irq(&ehci->lock);
 543                 port_status = ehci_readl(ehci, status_reg);
 544                 if ((port_status & PORT_OWNER) == new_owner
 545                                 || (port_status & (PORT_OWNER | PORT_CONNECT))
 546                                         == 0)
 547                         try = 0;
 548                 else {
 549                         port_status ^= PORT_OWNER;
 550                         port_status &= ~(PORT_PE | PORT_RWC_BITS);
 551                         ehci_writel(ehci, port_status, status_reg);
 552                 }
 553                 spin_unlock_irq(&ehci->lock);
 554                 if (try > 1)
 555                         msleep(5);
 556         }
 557 }
 558
 559 /*-------------------------------------------------------------------------*/
 560
 561 static int check_reset_complete (
 562         struct ehci_hcd *ehci,
 563         int             index,
 564         u32 __iomem     *status_reg,
 565         int             port_status
 566 ) {
 567         if (!(port_status & PORT_CONNECT))
 568                 return port_status;
 569
 570         /* if reset finished and it's still not enabled -- handoff */
 571         if (!(port_status & PORT_PE)) {
 572
 573                 /* with integrated TT, there's nobody to hand it to! */
 574                 if (ehci_is_TDI(ehci)) {
 575                         ehci_dbg (ehci,
 576                                 "Failed to enable port %d on root hub TT\n",
 577                                 index+1);
 578                         return port_status;
 579                 }
 580
 581                 ehci_dbg (ehci, "port %d full speed --> companion\n",
 582                         index + 1);
 583
 584                 // what happens if HCS_N_CC(params) == 0 ?
 585                 port_status |= PORT_OWNER;
 586                 port_status &= ~PORT_RWC_BITS;
 587                 ehci_writel(ehci, port_status, status_reg);
 588
 589                 /* ensure 440EPX ohci controller state is operational */
 590                 if (ehci->has_amcc_usb23)
 591                         set_ohci_hcfs(ehci, 1);
 592         } else {
 593                 ehci_dbg(ehci, "port %d reset complete, port enabled\n",
 594                         index + 1);
 595                 /* ensure 440EPx ohci controller state is suspended */
 596                 if (ehci->has_amcc_usb23)
 597                         set_ohci_hcfs(ehci, 0);
 598         }
 599
 600         return port_status;
 601 }
 602
 603 /*-------------------------------------------------------------------------*/
 604
 605
 606 /* build "status change" packet (one or two bytes) from HC registers */
 607
 608 static int
 609 ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
 610 {
 611         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 612         u32             temp, status;
 613         u32             mask;
 614         int             ports, i, retval = 1;
 615         unsigned long   flags;
 616         u32             ppcd = ~0;
 617
 618         /* init status to no-changes */
 619         buf [0] = 0;
 620         ports = HCS_N_PORTS (ehci->hcs_params);
 621         if (ports > 7) {
 622                 buf [1] = 0;
 623                 retval++;
 624         }
 625
 626         /* Inform the core about resumes-in-progress by returning
 627          * a non-zero value even if there are no status changes.
 628          */
 629         status = ehci->resuming_ports;
 630
 631         /* Some boards (mostly VIA?) report bogus overcurrent indications,
 632          * causing massive log spam unless we completely ignore them.  It
 633          * may be relevant that VIA VT8235 controllers, where PORT_POWER is
 634          * always set, seem to clear PORT_OCC and PORT_CSC when writing to
 635          * PORT_POWER; that's surprising, but maybe within-spec.
 636          */
 637         if (!ignore_oc)
 638                 mask = PORT_CSC | PORT_PEC | PORT_OCC;
 639         else
 640                 mask = PORT_CSC | PORT_PEC;
 641         // PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
 642
 643         /* no hub change reports (bit 0) for now (power, ...) */
 644
 645         /* port N changes (bit N)? */
 646         spin_lock_irqsave (&ehci->lock, flags);
 647
 648         /* get per-port change detect bits */
 649         if (ehci->has_ppcd)
 650                 ppcd = ehci_readl(ehci, &ehci->regs->status) >> 16;
 651
 652         for (i = 0; i < ports; i++) {
 653                 /* leverage per-port change bits feature */
 654                 if (ppcd & (1 << i))
 655                         temp = ehci_readl(ehci, &ehci->regs->port_status[i]);
 656                 else
 657                         temp = 0;
 658
 659                 /*
 660                  * Return status information even for ports with OWNER set.
 661                  * Otherwise hub_wq wouldn't see the disconnect event when a
 662                  * high-speed device is switched over to the companion
 663                  * controller by the user.
 664                  */
 665
 666                 if ((temp & mask) != 0 || test_bit(i, &ehci->port_c_suspend)
 667                                 || (ehci->reset_done[i] && time_after_eq(
 668                                         jiffies, ehci->reset_done[i]))) {
 669                         if (i < 7)
 670                             buf [0] |= 1 << (i + 1);
 671                         else
 672                             buf [1] |= 1 << (i - 7);
 673                         status = STS_PCD;
 674                 }
 675         }
 676
 677         /* If a resume is in progress, make sure it can finish */
 678         if (ehci->resuming_ports)
 679                 mod_timer(&hcd->rh_timer, jiffies + msecs_to_jiffies(25));
 680
 681         spin_unlock_irqrestore (&ehci->lock, flags);
 682         return status ? retval : 0;
 683 }
 684
 685 /*-------------------------------------------------------------------------*/
 686
 687 static void
 688 ehci_hub_descriptor (
 689         struct ehci_hcd                 *ehci,
 690         struct usb_hub_descriptor       *desc
 691 ) {
 692         int             ports = HCS_N_PORTS (ehci->hcs_params);
 693         u16             temp;
 694
 695         desc->bDescriptorType = USB_DT_HUB;
 696         desc->bPwrOn2PwrGood = 10;      /* ehci 1.0, 2.3.9 says 20ms max */
 697         desc->bHubContrCurrent = 0;
 698
 699         desc->bNbrPorts = ports;
 700         temp = 1 + (ports / 8);
 701         desc->bDescLength = 7 + 2 * temp;
 702
 703         /* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
 704         memset(&desc->u.hs.DeviceRemovable[0], 0, temp);
 705         memset(&desc->u.hs.DeviceRemovable[temp], 0xff, temp);
 706
 707         temp = HUB_CHAR_INDV_PORT_OCPM; /* per-port overcurrent reporting */
 708         if (HCS_PPC (ehci->hcs_params))
 709                 temp |= HUB_CHAR_INDV_PORT_LPSM; /* per-port power control */
 710         else
 711                 temp |= HUB_CHAR_NO_LPSM; /* no power switching */
 712 #if 0
 713 // re-enable when we support USB_PORT_FEAT_INDICATOR below.
 714         if (HCS_INDICATOR (ehci->hcs_params))
 715                 temp |= HUB_CHAR_PORTIND; /* per-port indicators (LEDs) */
 716 #endif
 717         desc->wHubCharacteristics = cpu_to_le16(temp);
 718 }
 719
 720 /*-------------------------------------------------------------------------*/
 721 #ifdef CONFIG_USB_HCD_TEST_MODE
 722
 723 #define EHSET_TEST_SINGLE_STEP_SET_FEATURE 0x06
 724
 725 static void usb_ehset_completion(struct urb *urb)
 726 {
 727         struct completion  *done = urb->context;
 728
 729         complete(done);
 730 }
 731 static int submit_single_step_set_feature(
 732         struct usb_hcd  *hcd,
 733         struct urb      *urb,
 734         int             is_setup
 735 );
 736
 737 /*
 738  * Allocate and initialize a control URB. This request will be used by the
 739  * EHSET SINGLE_STEP_SET_FEATURE test in which the DATA and STATUS stages
 740  * of the GetDescriptor request are sent 15 seconds after the SETUP stage.
 741  * Return NULL if failed.
 742  */
 743 static struct urb *request_single_step_set_feature_urb(
 744         struct usb_device       *udev,
 745         void                    *dr,
 746         void                    *buf,
 747         struct completion       *done
 748 ) {
 749         struct urb *urb;
 750         struct usb_hcd *hcd = bus_to_hcd(udev->bus);
 751         struct usb_host_endpoint *ep;
 752
 753         urb = usb_alloc_urb(0, GFP_KERNEL);
 754         if (!urb)
 755                 return NULL;
 756
 757         urb->pipe = usb_rcvctrlpipe(udev, 0);
 758         ep = (usb_pipein(urb->pipe) ? udev->ep_in : udev->ep_out)
 759                                 [usb_pipeendpoint(urb->pipe)];
 760         if (!ep) {
 761                 usb_free_urb(urb);
 762                 return NULL;
 763         }
 764
 765         urb->ep = ep;
 766         urb->dev = udev;
 767         urb->setup_packet = (void *)dr;
 768         urb->transfer_buffer = buf;
 769         urb->transfer_buffer_length = USB_DT_DEVICE_SIZE;
 770         urb->complete = usb_ehset_completion;
 771         urb->status = -EINPROGRESS;
 772         urb->actual_length = 0;
 773         urb->transfer_flags = URB_DIR_IN;
 774         usb_get_urb(urb);
 775         atomic_inc(&urb->use_count);
 776         atomic_inc(&urb->dev->urbnum);
 777         urb->setup_dma = dma_map_single(
 778                         hcd->self.controller,
 779                         urb->setup_packet,
 780                         sizeof(struct usb_ctrlrequest),
 781                         DMA_TO_DEVICE);
 782         urb->transfer_dma = dma_map_single(
 783                         hcd->self.controller,
 784                         urb->transfer_buffer,
 785                         urb->transfer_buffer_length,
 786                         DMA_FROM_DEVICE);
 787         urb->context = done;
 788         return urb;
 789 }
 790
 791 static int ehset_single_step_set_feature(struct usb_hcd *hcd, int port)
 792 {
 793         int retval = -ENOMEM;
 794         struct usb_ctrlrequest *dr;
 795         struct urb *urb;
 796         struct usb_device *udev;
 797         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 798         struct usb_device_descriptor *buf;
 799         DECLARE_COMPLETION_ONSTACK(done);
 800
 801         /* Obtain udev of the rhub's child port */
 802         udev = usb_hub_find_child(hcd->self.root_hub, port);
 803         if (!udev) {
 804                 ehci_err(ehci, "No device attached to the RootHub\n");
 805                 return -ENODEV;
 806         }
 807         buf = kmalloc(USB_DT_DEVICE_SIZE, GFP_KERNEL);
 808         if (!buf)
 809                 return -ENOMEM;
 810
 811         dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
 812         if (!dr) {
 813                 kfree(buf);
 814                 return -ENOMEM;
 815         }
 816
 817         /* Fill Setup packet for GetDescriptor */
 818         dr->bRequestType = USB_DIR_IN;
 819         dr->bRequest = USB_REQ_GET_DESCRIPTOR;
 820         dr->wValue = cpu_to_le16(USB_DT_DEVICE << 8);
 821         dr->wIndex = 0;
 822         dr->wLength = cpu_to_le16(USB_DT_DEVICE_SIZE);
 823         urb = request_single_step_set_feature_urb(udev, dr, buf, &done);
 824         if (!urb)
 825                 goto cleanup;
 826
 827         /* Submit just the SETUP stage */
 828         retval = submit_single_step_set_feature(hcd, urb, 1);
 829         if (retval)
 830                 goto out1;
 831         if (!wait_for_completion_timeout(&done, msecs_to_jiffies(2000))) {
 832                 usb_kill_urb(urb);
 833                 retval = -ETIMEDOUT;
 834                 ehci_err(ehci, "%s SETUP stage timed out on ep0\n", __func__);
 835                 goto out1;
 836         }
 837         msleep(15 * 1000);
 838
 839         /* Complete remaining DATA and STATUS stages using the same URB */
 840         urb->status = -EINPROGRESS;
 841         usb_get_urb(urb);
 842         atomic_inc(&urb->use_count);
 843         atomic_inc(&urb->dev->urbnum);
 844         retval = submit_single_step_set_feature(hcd, urb, 0);
 845         if (!retval && !wait_for_completion_timeout(&done,
 846                                                 msecs_to_jiffies(2000))) {
 847                 usb_kill_urb(urb);
 848                 retval = -ETIMEDOUT;
 849                 ehci_err(ehci, "%s IN stage timed out on ep0\n", __func__);
 850         }
 851 out1:
 852         usb_free_urb(urb);
 853 cleanup:
 854         kfree(dr);
 855         kfree(buf);
 856         return retval;
 857 }
 858 #endif /* CONFIG_USB_HCD_TEST_MODE */
 859 /*-------------------------------------------------------------------------*/
 860
 861 int ehci_hub_control(
 862         struct usb_hcd  *hcd,
 863         u16             typeReq,
 864         u16             wValue,
 865         u16             wIndex,
 866         char            *buf,
 867         u16             wLength
 868 ) {
 869         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 870         int             ports = HCS_N_PORTS (ehci->hcs_params);
 871         u32 __iomem     *status_reg = &ehci->regs->port_status[
 872                                 (wIndex & 0xff) - 1];
 873         u32 __iomem     *hostpc_reg = &ehci->regs->hostpc[(wIndex & 0xff) - 1];
 874         u32             temp, temp1, status;
 875         unsigned long   flags;
 876         int             retval = 0;
 877         unsigned        selector;
 878
 879         /*
 880          * FIXME:  support SetPortFeatures USB_PORT_FEAT_INDICATOR.
 881          * HCS_INDICATOR may say we can change LEDs to off/amber/green.
 882          * (track current state ourselves) ... blink for diagnostics,
 883          * power, "this is the one", etc.  EHCI spec supports this.
 884          */
 885
 886         spin_lock_irqsave (&ehci->lock, flags);
 887         switch (typeReq) {
 888         case ClearHubFeature:
 889                 switch (wValue) {
 890                 case C_HUB_LOCAL_POWER:
 891                 case C_HUB_OVER_CURRENT:
 892                         /* no hub-wide feature/status flags */
 893                         break;
 894                 default:
 895                         goto error;
 896                 }
 897                 break;
 898         case ClearPortFeature:
 899                 if (!wIndex || wIndex > ports)
 900                         goto error;
 901                 wIndex--;
 902                 temp = ehci_readl(ehci, status_reg);
 903                 temp &= ~PORT_RWC_BITS;
 904
 905                 /*
 906                  * Even if OWNER is set, so the port is owned by the
 907                  * companion controller, hub_wq needs to be able to clear
 908                  * the port-change status bits (especially
 909                  * USB_PORT_STAT_C_CONNECTION).
 910                  */
 911
 912                 switch (wValue) {
 913                 case USB_PORT_FEAT_ENABLE:
 914                         ehci_writel(ehci, temp & ~PORT_PE, status_reg);
 915                         break;
 916                 case USB_PORT_FEAT_C_ENABLE:
 917                         ehci_writel(ehci, temp | PORT_PEC, status_reg);
 918                         break;
 919                 case USB_PORT_FEAT_SUSPEND:
 920                         if (temp & PORT_RESET)
 921                                 goto error;
 922                         if (ehci->no_selective_suspend)
 923                                 break;
 924 #ifdef CONFIG_USB_OTG
 925                         if ((hcd->self.otg_port == (wIndex + 1))
 926                             && hcd->self.b_hnp_enable) {
 927                                 otg_start_hnp(hcd->usb_phy->otg);
 928                                 break;
 929                         }
 930 #endif
 931                         if (!(temp & PORT_SUSPEND))
 932                                 break;
 933                         if ((temp & PORT_PE) == 0)
 934                                 goto error;
 935
 936                         /* clear phy low-power mode before resume */
 937                         if (ehci->has_tdi_phy_lpm) {
 938                                 temp1 = ehci_readl(ehci, hostpc_reg);
 939                                 ehci_writel(ehci, temp1 & ~HOSTPC_PHCD,
 940                                                 hostpc_reg);
 941                                 spin_unlock_irqrestore(&ehci->lock, flags);
 942                                 msleep(5);/* wait to leave low-power mode */
 943                                 spin_lock_irqsave(&ehci->lock, flags);
 944                         }
 945                         /* resume signaling for 20 msec */
 946                         temp &= ~PORT_WAKE_BITS;
 947                         ehci_writel(ehci, temp | PORT_RESUME, status_reg);
 948                         ehci->reset_done[wIndex] = jiffies
 949                                         + msecs_to_jiffies(USB_RESUME_TIMEOUT);
 950                         set_bit(wIndex, &ehci->resuming_ports);
 951                         usb_hcd_start_port_resume(&hcd->self, wIndex);
 952                         break;
 953                 case USB_PORT_FEAT_C_SUSPEND:
 954                         clear_bit(wIndex, &ehci->port_c_suspend);
 955                         break;
 956                 case USB_PORT_FEAT_POWER:
 957                         if (HCS_PPC(ehci->hcs_params)) {
 958                                 spin_unlock_irqrestore(&ehci->lock, flags);
 959                                 ehci_port_power(ehci, wIndex, false);
 960                                 spin_lock_irqsave(&ehci->lock, flags);
 961                         }
 962                         break;
 963                 case USB_PORT_FEAT_C_CONNECTION:
 964                         ehci_writel(ehci, temp | PORT_CSC, status_reg);
 965                         break;
 966                 case USB_PORT_FEAT_C_OVER_CURRENT:
 967                         ehci_writel(ehci, temp | PORT_OCC, status_reg);
 968                         break;
 969                 case USB_PORT_FEAT_C_RESET:
 970                         /* GetPortStatus clears reset */
 971                         break;
 972                 default:
 973                         goto error;
 974                 }
 975                 ehci_readl(ehci, &ehci->regs->command); /* unblock posted write */
 976                 break;
 977         case GetHubDescriptor:
 978                 ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
 979                         buf);
 980                 break;
 981         case GetHubStatus:
 982                 /* no hub-wide feature/status flags */
 983                 memset (buf, 0, 4);
 984                 //cpu_to_le32s ((u32 *) buf);
 985                 break;
 986         case GetPortStatus:
 987                 if (!wIndex || wIndex > ports)
 988                         goto error;
 989                 wIndex--;
 990                 status = 0;
 991                 temp = ehci_readl(ehci, status_reg);
 992
 993                 // wPortChange bits
 994                 if (temp & PORT_CSC)
 995                         status |= USB_PORT_STAT_C_CONNECTION << 16;
 996                 if (temp & PORT_PEC)
 997                         status |= USB_PORT_STAT_C_ENABLE << 16;
 998
 999                 if ((temp & PORT_OCC) && !ignore_oc){
1000                         status |= USB_PORT_STAT_C_OVERCURRENT << 16;
1001
1002                         /*
1003                          * Hubs should disable port power on over-current.
1004                          * However, not all EHCI implementations do this
1005                          * automatically, even if they _do_ support per-port
1006                          * power switching; they're allowed to just limit the
1007                          * current.  hub_wq will turn the power back on.
1008                          */
1009                         if (((temp & PORT_OC) || (ehci->need_oc_pp_cycle))
1010                                         && HCS_PPC(ehci->hcs_params)) {
1011                                 spin_unlock_irqrestore(&ehci->lock, flags);
1012                                 ehci_port_power(ehci, wIndex, false);
1013                                 spin_lock_irqsave(&ehci->lock, flags);
1014                                 temp = ehci_readl(ehci, status_reg);
1015                         }
1016                 }
1017
1018                 /* no reset or resume pending */
1019                 if (!ehci->reset_done[wIndex]) {
1020
1021                         /* Remote Wakeup received? */
1022                         if (temp & PORT_RESUME) {
1023                                 /* resume signaling for 20 msec */
1024                                 ehci->reset_done[wIndex] = jiffies
1025                                                 + msecs_to_jiffies(20);
1026                                 usb_hcd_start_port_resume(&hcd->self, wIndex);
1027                                 set_bit(wIndex, &ehci->resuming_ports);
1028                                 /* check the port again */
1029                                 mod_timer(&ehci_to_hcd(ehci)->rh_timer,
1030                                                 ehci->reset_done[wIndex]);
1031                         }
1032
1033                 /* reset or resume not yet complete */
1034                 } else if (!time_after_eq(jiffies, ehci->reset_done[wIndex])) {
1035                         ;       /* wait until it is complete */
1036
1037                 /* resume completed */
1038                 } else if (test_bit(wIndex, &ehci->resuming_ports)) {
1039                         clear_bit(wIndex, &ehci->suspended_ports);
1040                         set_bit(wIndex, &ehci->port_c_suspend);
1041                         ehci->reset_done[wIndex] = 0;
1042                         usb_hcd_end_port_resume(&hcd->self, wIndex);
1043
1044                         /* stop resume signaling */
1045                         temp &= ~(PORT_RWC_BITS | PORT_SUSPEND | PORT_RESUME);
1046                         ehci_writel(ehci, temp, status_reg);
1047                         clear_bit(wIndex, &ehci->resuming_ports);
1048                         retval = ehci_handshake(ehci, status_reg,
1049                                         PORT_RESUME, 0, 2000 /* 2msec */);
1050                         if (retval != 0) {
1051                                 ehci_err(ehci, "port %d resume error %d\n",
1052                                                 wIndex + 1, retval);
1053                                 goto error;
1054                         }
1055                         temp = ehci_readl(ehci, status_reg);
1056
1057                 /* whoever resets must GetPortStatus to complete it!! */
1058                 } else {
1059                         status |= USB_PORT_STAT_C_RESET << 16;
1060                         ehci->reset_done [wIndex] = 0;
1061
1062                         /* force reset to complete */
1063                         ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESET),
1064                                         status_reg);
1065                         /* REVISIT:  some hardware needs 550+ usec to clear
1066                          * this bit; seems too long to spin routinely...
1067                          */
1068                         retval = ehci_handshake(ehci, status_reg,
1069                                         PORT_RESET, 0, 1000);
1070                         if (retval != 0) {
1071                                 ehci_err (ehci, "port %d reset error %d\n",
1072                                         wIndex + 1, retval);
1073                                 goto error;
1074                         }
1075
1076                         /* see what we found out */
1077                         temp = check_reset_complete (ehci, wIndex, status_reg,
1078                                         ehci_readl(ehci, status_reg));
1079                 }
1080
1081                 /* transfer dedicated ports to the companion hc */
1082                 if ((temp & PORT_CONNECT) &&
1083                                 test_bit(wIndex, &ehci->companion_ports)) {
1084                         temp &= ~PORT_RWC_BITS;
1085                         temp |= PORT_OWNER;
1086                         ehci_writel(ehci, temp, status_reg);
1087                         ehci_dbg(ehci, "port %d --> companion\n", wIndex + 1);
1088                         temp = ehci_readl(ehci, status_reg);
1089                 }
1090
1091                 /*
1092                  * Even if OWNER is set, there's no harm letting hub_wq
1093                  * see the wPortStatus values (they should all be 0 except
1094                  * for PORT_POWER anyway).
1095                  */
1096
1097                 if (temp & PORT_CONNECT) {
1098                         status |= USB_PORT_STAT_CONNECTION;
1099                         // status may be from integrated TT
1100                         if (ehci->has_hostpc) {
1101                                 temp1 = ehci_readl(ehci, hostpc_reg);
1102                                 status |= ehci_port_speed(ehci, temp1);
1103                         } else
1104                                 status |= ehci_port_speed(ehci, temp);
1105                 }
1106                 if (temp & PORT_PE)
1107                         status |= USB_PORT_STAT_ENABLE;
1108
1109                 /* maybe the port was unsuspended without our knowledge */
1110                 if (temp & (PORT_SUSPEND|PORT_RESUME)) {
1111                         status |= USB_PORT_STAT_SUSPEND;
1112                 } else if (test_bit(wIndex, &ehci->suspended_ports)) {
1113                         clear_bit(wIndex, &ehci->suspended_ports);
1114                         clear_bit(wIndex, &ehci->resuming_ports);
1115                         ehci->reset_done[wIndex] = 0;
1116                         if (temp & PORT_PE)
1117                                 set_bit(wIndex, &ehci->port_c_suspend);
1118                         usb_hcd_end_port_resume(&hcd->self, wIndex);
1119                 }
1120
1121                 if (temp & PORT_OC)
1122                         status |= USB_PORT_STAT_OVERCURRENT;
1123                 if (temp & PORT_RESET)
1124                         status |= USB_PORT_STAT_RESET;
1125                 if (temp & PORT_POWER)
1126                         status |= USB_PORT_STAT_POWER;
1127                 if (test_bit(wIndex, &ehci->port_c_suspend))
1128                         status |= USB_PORT_STAT_C_SUSPEND << 16;
1129
1130                 if (status & ~0xffff)   /* only if wPortChange is interesting */
1131                         dbg_port(ehci, "GetStatus", wIndex + 1, temp);
1132                 put_unaligned_le32(status, buf);
1133                 break;
1134         case SetHubFeature:
1135                 switch (wValue) {
1136                 case C_HUB_LOCAL_POWER:
1137                 case C_HUB_OVER_CURRENT:
1138                         /* no hub-wide feature/status flags */
1139                         break;
1140                 default:
1141                         goto error;
1142                 }
1143                 break;
1144         case SetPortFeature:
1145                 selector = wIndex >> 8;
1146                 wIndex &= 0xff;
1147                 if (unlikely(ehci->debug)) {
1148                         /* If the debug port is active any port
1149                          * feature requests should get denied */
1150                         if (wIndex == HCS_DEBUG_PORT(ehci->hcs_params) &&
1151                             (readl(&ehci->debug->control) & DBGP_ENABLED)) {
1152                                 retval = -ENODEV;
1153                                 goto error_exit;
1154                         }
1155                 }
1156                 if (!wIndex || wIndex > ports)
1157                         goto error;
1158                 wIndex--;
1159                 temp = ehci_readl(ehci, status_reg);
1160                 if (temp & PORT_OWNER)
1161                         break;
1162
1163                 temp &= ~PORT_RWC_BITS;
1164                 switch (wValue) {
1165                 case USB_PORT_FEAT_SUSPEND:
1166                         if (ehci->no_selective_suspend)
1167                                 break;
1168                         if ((temp & PORT_PE) == 0
1169                                         || (temp & PORT_RESET) != 0)
1170                                 goto error;
1171
1172                         /* After above check the port must be connected.
1173                          * Set appropriate bit thus could put phy into low power
1174                          * mode if we have tdi_phy_lpm feature
1175                          */
1176                         temp &= ~PORT_WKCONN_E;
1177                         temp |= PORT_WKDISC_E | PORT_WKOC_E;
1178                         ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
1179                         if (ehci->has_tdi_phy_lpm) {
1180                                 spin_unlock_irqrestore(&ehci->lock, flags);
1181                                 msleep(5);/* 5ms for HCD enter low pwr mode */
1182                                 spin_lock_irqsave(&ehci->lock, flags);
1183                                 temp1 = ehci_readl(ehci, hostpc_reg);
1184                                 ehci_writel(ehci, temp1 | HOSTPC_PHCD,
1185                                         hostpc_reg);
1186                                 temp1 = ehci_readl(ehci, hostpc_reg);
1187                                 ehci_dbg(ehci, "Port%d phy low pwr mode %s\n",
1188                                         wIndex, (temp1 & HOSTPC_PHCD) ?
1189                                         "succeeded" : "failed");
1190                         }
1191                         set_bit(wIndex, &ehci->suspended_ports);
1192                         break;
1193                 case USB_PORT_FEAT_POWER:
1194                         if (HCS_PPC(ehci->hcs_params)) {
1195                                 spin_unlock_irqrestore(&ehci->lock, flags);
1196                                 ehci_port_power(ehci, wIndex, true);
1197                                 spin_lock_irqsave(&ehci->lock, flags);
1198                         }
1199                         break;
1200                 case USB_PORT_FEAT_RESET:
1201                         if (temp & (PORT_SUSPEND|PORT_RESUME))
1202                                 goto error;
1203                         /* line status bits may report this as low speed,
1204                          * which can be fine if this root hub has a
1205                          * transaction translator built in.
1206                          */
1207                         if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
1208                                         && !ehci_is_TDI(ehci)
1209                                         && PORT_USB11 (temp)) {
1210                                 ehci_dbg (ehci,
1211                                         "port %d low speed --> companion\n",
1212                                         wIndex + 1);
1213                                 temp |= PORT_OWNER;
1214                         } else {
1215                                 temp |= PORT_RESET;
1216                                 temp &= ~PORT_PE;
1217
1218                                 /*
1219                                  * caller must wait, then call GetPortStatus
1220                                  * usb 2.0 spec says 50 ms resets on root
1221                                  */
1222                                 ehci->reset_done [wIndex] = jiffies
1223                                                 + msecs_to_jiffies (50);
1224
1225                                 /*
1226                                  * Force full-speed connect for FSL high-speed
1227                                  * erratum; disable HS Chirp by setting PFSC bit
1228                                  */
1229                                 if (ehci_has_fsl_hs_errata(ehci))
1230                                         temp |= (1 << PORTSC_FSL_PFSC);
1231                         }
1232                         ehci_writel(ehci, temp, status_reg);
1233                         break;
1234
1235                 /* For downstream facing ports (these):  one hub port is put
1236                  * into test mode according to USB2 11.24.2.13, then the hub
1237                  * must be reset (which for root hub now means rmmod+modprobe,
1238                  * or else system reboot).  See EHCI 2.3.9 and 4.14 for info
1239                  * about the EHCI-specific stuff.
1240                  */
1241                 case USB_PORT_FEAT_TEST:
1242 #ifdef CONFIG_USB_HCD_TEST_MODE
1243                         if (selector == EHSET_TEST_SINGLE_STEP_SET_FEATURE) {
1244                                 spin_unlock_irqrestore(&ehci->lock, flags);
1245                                 retval = ehset_single_step_set_feature(hcd,
1246                                                                 wIndex + 1);
1247                                 spin_lock_irqsave(&ehci->lock, flags);
1248                                 break;
1249                         }
1250 #endif
1251                         if (!selector || selector > 5)
1252                                 goto error;
1253                         spin_unlock_irqrestore(&ehci->lock, flags);
1254                         ehci_quiesce(ehci);
1255                         spin_lock_irqsave(&ehci->lock, flags);
1256
1257                         /* Put all enabled ports into suspend */
1258                         while (ports--) {
1259                                 u32 __iomem *sreg =
1260                                                 &ehci->regs->port_status[ports];
1261
1262                                 temp = ehci_readl(ehci, sreg) & ~PORT_RWC_BITS;
1263                                 if (temp & PORT_PE)
1264                                         ehci_writel(ehci, temp | PORT_SUSPEND,
1265                                                         sreg);
1266                         }
1267
1268                         spin_unlock_irqrestore(&ehci->lock, flags);
1269                         ehci_halt(ehci);
1270                         spin_lock_irqsave(&ehci->lock, flags);
1271
1272                         temp = ehci_readl(ehci, status_reg);
1273                         temp |= selector << 16;
1274                         ehci_writel(ehci, temp, status_reg);
1275                         break;
1276
1277                 default:
1278                         goto error;
1279                 }
1280                 ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
1281                 break;
1282
1283         default:
1284 error:
1285                 /* "stall" on error */
1286                 retval = -EPIPE;
1287         }
1288 error_exit:
1289         spin_unlock_irqrestore (&ehci->lock, flags);
1290         return retval;
1291 }
1292 EXPORT_SYMBOL_GPL(ehci_hub_control);
1293
1294 static void ehci_relinquish_port(struct usb_hcd *hcd, int portnum)
1295 {
1296         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1297
1298         if (ehci_is_TDI(ehci))
1299                 return;
1300         set_owner(ehci, --portnum, PORT_OWNER);
1301 }
1302
1303 static int ehci_port_handed_over(struct usb_hcd *hcd, int portnum)
1304 {
1305         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1306         u32 __iomem             *reg;
1307
1308         if (ehci_is_TDI(ehci))
1309                 return 0;
1310         reg = &ehci->regs->port_status[portnum - 1];
1311         return ehci_readl(ehci, reg) & PORT_OWNER;
1312 }
1313
1314 static int ehci_port_power(struct ehci_hcd *ehci, int portnum, bool enable)
1315 {
1316         struct usb_hcd *hcd = ehci_to_hcd(ehci);
1317         u32 __iomem *status_reg = &ehci->regs->port_status[portnum];
1318         u32 temp = ehci_readl(ehci, status_reg) & ~PORT_RWC_BITS;
1319
1320         if (enable)
1321                 ehci_writel(ehci, temp | PORT_POWER, status_reg);
1322         else
1323                 ehci_writel(ehci, temp & ~PORT_POWER, status_reg);
1324
1325         if (hcd->driver->port_power)
1326                 hcd->driver->port_power(hcd, portnum, enable);
1327
1328         return 0;
1329 }