err.no Git - linux-2.6/blob - 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
  31 #ifdef  CONFIG_USB_PERSIST
  32
  33 static int ehci_hub_control(
  34         struct usb_hcd  *hcd,
  35         u16             typeReq,
  36         u16             wValue,
  37         u16             wIndex,
  38         char            *buf,
  39         u16             wLength
  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         /* Give the connections some time to appear */
  57         msleep(20);
  58
  59         port = HCS_N_PORTS(ehci->hcs_params);
  60         while (port--) {
  61                 if (test_bit(port, &ehci->owned_ports)) {
  62                         reg = &ehci->regs->port_status[port];
  63                         status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
  64
  65                         /* Port already owned by companion? */
  66                         if (status & PORT_OWNER)
  67                                 clear_bit(port, &ehci->owned_ports);
  68                         else if (test_bit(port, &ehci->companion_ports))
  69                                 ehci_writel(ehci, status & ~PORT_PE, reg);
  70                         else
  71                                 ehci_hub_control(hcd, SetPortFeature,
  72                                                 USB_PORT_FEAT_RESET, port + 1,
  73                                                 NULL, 0);
  74                 }
  75         }
  76
  77         if (!ehci->owned_ports)
  78                 return;
  79         msleep(90);             /* Wait for resets to complete */
  80
  81         port = HCS_N_PORTS(ehci->hcs_params);
  82         while (port--) {
  83                 if (test_bit(port, &ehci->owned_ports)) {
  84                         ehci_hub_control(hcd, GetPortStatus,
  85                                         0, port + 1,
  86                                         (char *) &buf, sizeof(buf));
  87
  88                         /* The companion should now own the port,
  89                          * but if something went wrong the port must not
  90                          * remain enabled.
  91                          */
  92                         reg = &ehci->regs->port_status[port];
  93                         status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
  94                         if (status & PORT_OWNER)
  95                                 ehci_writel(ehci, status | PORT_CSC, reg);
  96                         else {
  97                                 ehci_dbg(ehci, "failed handover port %d: %x\n",
  98                                                 port + 1, status);
  99                                 ehci_writel(ehci, status & ~PORT_PE, reg);
 100                         }
 101                 }
 102         }
 103
 104         ehci->owned_ports = 0;
 105 }
 106
 107 #else   /* CONFIG_USB_PERSIST */
 108
 109 static inline void ehci_handover_companion_ports(struct ehci_hcd *ehci)
 110 { }
 111
 112 #endif
 113
 114 #ifdef  CONFIG_PM
 115
 116 static int ehci_bus_suspend (struct usb_hcd *hcd)
 117 {
 118         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 119         int                     port;
 120         int                     mask;
 121
 122         ehci_dbg(ehci, "suspend root hub\n");
 123
 124         if (time_before (jiffies, ehci->next_statechange))
 125                 msleep(5);
 126         del_timer_sync(&ehci->watchdog);
 127         del_timer_sync(&ehci->iaa_watchdog);
 128
 129         port = HCS_N_PORTS (ehci->hcs_params);
 130         spin_lock_irq (&ehci->lock);
 131
 132         /* stop schedules, clean any completed work */
 133         if (HC_IS_RUNNING(hcd->state)) {
 134                 ehci_quiesce (ehci);
 135                 hcd->state = HC_STATE_QUIESCING;
 136         }
 137         ehci->command = ehci_readl(ehci, &ehci->regs->command);
 138         if (ehci->reclaim)
 139                 end_unlink_async(ehci);
 140         ehci_work(ehci);
 141
 142         /* Unlike other USB host controller types, EHCI doesn't have
 143          * any notion of "global" or bus-wide suspend.  The driver has
 144          * to manually suspend all the active unsuspended ports, and
 145          * then manually resume them in the bus_resume() routine.
 146          */
 147         ehci->bus_suspended = 0;
 148         ehci->owned_ports = 0;
 149         while (port--) {
 150                 u32 __iomem     *reg = &ehci->regs->port_status [port];
 151                 u32             t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
 152                 u32             t2 = t1;
 153
 154                 /* keep track of which ports we suspend */
 155                 if (t1 & PORT_OWNER)
 156                         set_bit(port, &ehci->owned_ports);
 157                 else if ((t1 & PORT_PE) && !(t1 & PORT_SUSPEND)) {
 158                         t2 |= PORT_SUSPEND;
 159                         set_bit(port, &ehci->bus_suspended);
 160                 }
 161
 162                 /* enable remote wakeup on all ports */
 163                 if (device_may_wakeup(&hcd->self.root_hub->dev))
 164                         t2 |= PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E;
 165                 else
 166                         t2 &= ~(PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E);
 167
 168                 if (t1 != t2) {
 169                         ehci_vdbg (ehci, "port %d, %08x -> %08x\n",
 170                                 port + 1, t1, t2);
 171                         ehci_writel(ehci, t2, reg);
 172                 }
 173         }
 174
 175         /* Apparently some devices need a >= 1-uframe delay here */
 176         if (ehci->bus_suspended)
 177                 udelay(150);
 178
 179         /* turn off now-idle HC */
 180         ehci_halt (ehci);
 181         hcd->state = HC_STATE_SUSPENDED;
 182
 183         /* allow remote wakeup */
 184         mask = INTR_MASK;
 185         if (!device_may_wakeup(&hcd->self.root_hub->dev))
 186                 mask &= ~STS_PCD;
 187         ehci_writel(ehci, mask, &ehci->regs->intr_enable);
 188         ehci_readl(ehci, &ehci->regs->intr_enable);
 189
 190         ehci->next_statechange = jiffies + msecs_to_jiffies(10);
 191         spin_unlock_irq (&ehci->lock);
 192         return 0;
 193 }
 194
 195
 196 /* caller has locked the root hub, and should reset/reinit on error */
 197 static int ehci_bus_resume (struct usb_hcd *hcd)
 198 {
 199         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 200         u32                     temp;
 201         u32                     power_okay;
 202         int                     i;
 203
 204         if (time_before (jiffies, ehci->next_statechange))
 205                 msleep(5);
 206         spin_lock_irq (&ehci->lock);
 207         if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
 208                 spin_unlock_irq(&ehci->lock);
 209                 return -ESHUTDOWN;
 210         }
 211
 212         /* Ideally and we've got a real resume here, and no port's power
 213          * was lost.  (For PCI, that means Vaux was maintained.)  But we
 214          * could instead be restoring a swsusp snapshot -- so that BIOS was
 215          * the last user of the controller, not reset/pm hardware keeping
 216          * state we gave to it.
 217          */
 218         power_okay = ehci_readl(ehci, &ehci->regs->intr_enable);
 219         ehci_dbg(ehci, "resume root hub%s\n",
 220                         power_okay ? "" : " after power loss");
 221
 222         /* at least some APM implementations will try to deliver
 223          * IRQs right away, so delay them until we're ready.
 224          */
 225         ehci_writel(ehci, 0, &ehci->regs->intr_enable);
 226
 227         /* re-init operational registers */
 228         ehci_writel(ehci, 0, &ehci->regs->segment);
 229         ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
 230         ehci_writel(ehci, (u32) ehci->async->qh_dma, &ehci->regs->async_next);
 231
 232         /* restore CMD_RUN, framelist size, and irq threshold */
 233         ehci_writel(ehci, ehci->command, &ehci->regs->command);
 234
 235         /* Some controller/firmware combinations need a delay during which
 236          * they set up the port statuses.  See Bugzilla #8190. */
 237         mdelay(8);
 238
 239         /* manually resume the ports we suspended during bus_suspend() */
 240         i = HCS_N_PORTS (ehci->hcs_params);
 241         while (i--) {
 242                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 243                 temp &= ~(PORT_RWC_BITS
 244                         | PORT_WKOC_E | PORT_WKDISC_E | PORT_WKCONN_E);
 245                 if (test_bit(i, &ehci->bus_suspended) &&
 246                                 (temp & PORT_SUSPEND)) {
 247                         ehci->reset_done [i] = jiffies + msecs_to_jiffies (20);
 248                         temp |= PORT_RESUME;
 249                 }
 250                 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
 251         }
 252         i = HCS_N_PORTS (ehci->hcs_params);
 253         mdelay (20);
 254         while (i--) {
 255                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 256                 if (test_bit(i, &ehci->bus_suspended) &&
 257                                 (temp & PORT_SUSPEND)) {
 258                         temp &= ~(PORT_RWC_BITS | PORT_RESUME);
 259                         ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
 260                         ehci_vdbg (ehci, "resumed port %d\n", i + 1);
 261                 }
 262         }
 263         (void) ehci_readl(ehci, &ehci->regs->command);
 264
 265         /* maybe re-activate the schedule(s) */
 266         temp = 0;
 267         if (ehci->async->qh_next.qh)
 268                 temp |= CMD_ASE;
 269         if (ehci->periodic_sched)
 270                 temp |= CMD_PSE;
 271         if (temp) {
 272                 ehci->command |= temp;
 273                 ehci_writel(ehci, ehci->command, &ehci->regs->command);
 274         }
 275
 276         ehci->next_statechange = jiffies + msecs_to_jiffies(5);
 277         hcd->state = HC_STATE_RUNNING;
 278
 279         /* Now we can safely re-enable irqs */
 280         ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
 281
 282         spin_unlock_irq (&ehci->lock);
 283
 284         if (!power_okay)
 285                 ehci_handover_companion_ports(ehci);
 286         return 0;
 287 }
 288
 289 #else
 290
 291 #define ehci_bus_suspend        NULL
 292 #define ehci_bus_resume         NULL
 293
 294 #endif  /* CONFIG_PM */
 295
 296 /*-------------------------------------------------------------------------*/
 297
 298 /* Display the ports dedicated to the companion controller */
 299 static ssize_t show_companion(struct device *dev,
 300                               struct device_attribute *attr,
 301                               char *buf)
 302 {
 303         struct ehci_hcd         *ehci;
 304         int                     nports, index, n;
 305         int                     count = PAGE_SIZE;
 306         char                    *ptr = buf;
 307
 308         ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
 309         nports = HCS_N_PORTS(ehci->hcs_params);
 310
 311         for (index = 0; index < nports; ++index) {
 312                 if (test_bit(index, &ehci->companion_ports)) {
 313                         n = scnprintf(ptr, count, "%d\n", index + 1);
 314                         ptr += n;
 315                         count -= n;
 316                 }
 317         }
 318         return ptr - buf;
 319 }
 320
 321 /*
 322  * Sets the owner of a port
 323  */
 324 static void set_owner(struct ehci_hcd *ehci, int portnum, int new_owner)
 325 {
 326         u32 __iomem             *status_reg;
 327         u32                     port_status;
 328         int                     try;
 329
 330         status_reg = &ehci->regs->port_status[portnum];
 331
 332         /*
 333          * The controller won't set the OWNER bit if the port is
 334          * enabled, so this loop will sometimes require at least two
 335          * iterations: one to disable the port and one to set OWNER.
 336          */
 337         for (try = 4; try > 0; --try) {
 338                 spin_lock_irq(&ehci->lock);
 339                 port_status = ehci_readl(ehci, status_reg);
 340                 if ((port_status & PORT_OWNER) == new_owner
 341                                 || (port_status & (PORT_OWNER | PORT_CONNECT))
 342                                         == 0)
 343                         try = 0;
 344                 else {
 345                         port_status ^= PORT_OWNER;
 346                         port_status &= ~(PORT_PE | PORT_RWC_BITS);
 347                         ehci_writel(ehci, port_status, status_reg);
 348                 }
 349                 spin_unlock_irq(&ehci->lock);
 350                 if (try > 1)
 351                         msleep(5);
 352         }
 353 }
 354
 355 /*
 356  * Dedicate or undedicate a port to the companion controller.
 357  * Syntax is "[-]portnum", where a leading '-' sign means
 358  * return control of the port to the EHCI controller.
 359  */
 360 static ssize_t store_companion(struct device *dev,
 361                                struct device_attribute *attr,
 362                                const char *buf, size_t count)
 363 {
 364         struct ehci_hcd         *ehci;
 365         int                     portnum, new_owner;
 366
 367         ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
 368         new_owner = PORT_OWNER;         /* Owned by companion */
 369         if (sscanf(buf, "%d", &portnum) != 1)
 370                 return -EINVAL;
 371         if (portnum < 0) {
 372                 portnum = - portnum;
 373                 new_owner = 0;          /* Owned by EHCI */
 374         }
 375         if (portnum <= 0 || portnum > HCS_N_PORTS(ehci->hcs_params))
 376                 return -ENOENT;
 377         portnum--;
 378         if (new_owner)
 379                 set_bit(portnum, &ehci->companion_ports);
 380         else
 381                 clear_bit(portnum, &ehci->companion_ports);
 382         set_owner(ehci, portnum, new_owner);
 383         return count;
 384 }
 385 static DEVICE_ATTR(companion, 0644, show_companion, store_companion);
 386
 387 static inline void create_companion_file(struct ehci_hcd *ehci)
 388 {
 389         int     i;
 390
 391         /* with integrated TT there is no companion! */
 392         if (!ehci_is_TDI(ehci))
 393                 i = device_create_file(ehci_to_hcd(ehci)->self.dev,
 394                                        &dev_attr_companion);
 395 }
 396
 397 static inline void remove_companion_file(struct ehci_hcd *ehci)
 398 {
 399         /* with integrated TT there is no companion! */
 400         if (!ehci_is_TDI(ehci))
 401                 device_remove_file(ehci_to_hcd(ehci)->self.dev,
 402                                    &dev_attr_companion);
 403 }
 404
 405
 406 /*-------------------------------------------------------------------------*/
 407
 408 static int check_reset_complete (
 409         struct ehci_hcd *ehci,
 410         int             index,
 411         u32 __iomem     *status_reg,
 412         int             port_status
 413 ) {
 414         if (!(port_status & PORT_CONNECT))
 415                 return port_status;
 416
 417         /* if reset finished and it's still not enabled -- handoff */
 418         if (!(port_status & PORT_PE)) {
 419
 420                 /* with integrated TT, there's nobody to hand it to! */
 421                 if (ehci_is_TDI(ehci)) {
 422                         ehci_dbg (ehci,
 423                                 "Failed to enable port %d on root hub TT\n",
 424                                 index+1);
 425                         return port_status;
 426                 }
 427
 428                 ehci_dbg (ehci, "port %d full speed --> companion\n",
 429                         index + 1);
 430
 431                 // what happens if HCS_N_CC(params) == 0 ?
 432                 port_status |= PORT_OWNER;
 433                 port_status &= ~PORT_RWC_BITS;
 434                 ehci_writel(ehci, port_status, status_reg);
 435
 436         } else
 437                 ehci_dbg (ehci, "port %d high speed\n", index + 1);
 438
 439         return port_status;
 440 }
 441
 442 /*-------------------------------------------------------------------------*/
 443
 444
 445 /* build "status change" packet (one or two bytes) from HC registers */
 446
 447 static int
 448 ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
 449 {
 450         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 451         u32             temp, status = 0;
 452         u32             mask;
 453         int             ports, i, retval = 1;
 454         unsigned long   flags;
 455
 456         /* if !USB_SUSPEND, root hub timers won't get shut down ... */
 457         if (!HC_IS_RUNNING(hcd->state))
 458                 return 0;
 459
 460         /* init status to no-changes */
 461         buf [0] = 0;
 462         ports = HCS_N_PORTS (ehci->hcs_params);
 463         if (ports > 7) {
 464                 buf [1] = 0;
 465                 retval++;
 466         }
 467
 468         /* Some boards (mostly VIA?) report bogus overcurrent indications,
 469          * causing massive log spam unless we completely ignore them.  It
 470          * may be relevant that VIA VT8235 controllers, where PORT_POWER is
 471          * always set, seem to clear PORT_OCC and PORT_CSC when writing to
 472          * PORT_POWER; that's surprising, but maybe within-spec.
 473          */
 474         if (!ignore_oc)
 475                 mask = PORT_CSC | PORT_PEC | PORT_OCC;
 476         else
 477                 mask = PORT_CSC | PORT_PEC;
 478         // PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
 479
 480         /* no hub change reports (bit 0) for now (power, ...) */
 481
 482         /* port N changes (bit N)? */
 483         spin_lock_irqsave (&ehci->lock, flags);
 484         for (i = 0; i < ports; i++) {
 485                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 486
 487                 /*
 488                  * Return status information even for ports with OWNER set.
 489                  * Otherwise khubd wouldn't see the disconnect event when a
 490                  * high-speed device is switched over to the companion
 491                  * controller by the user.
 492                  */
 493
 494                 if ((temp & mask) != 0
 495                                 || ((temp & PORT_RESUME) != 0
 496                                         && time_after_eq(jiffies,
 497                                                 ehci->reset_done[i]))) {
 498                         if (i < 7)
 499                             buf [0] |= 1 << (i + 1);
 500                         else
 501                             buf [1] |= 1 << (i - 7);
 502                         status = STS_PCD;
 503                 }
 504         }
 505         /* FIXME autosuspend idle root hubs */
 506         spin_unlock_irqrestore (&ehci->lock, flags);
 507         return status ? retval : 0;
 508 }
 509
 510 /*-------------------------------------------------------------------------*/
 511
 512 static void
 513 ehci_hub_descriptor (
 514         struct ehci_hcd                 *ehci,
 515         struct usb_hub_descriptor       *desc
 516 ) {
 517         int             ports = HCS_N_PORTS (ehci->hcs_params);
 518         u16             temp;
 519
 520         desc->bDescriptorType = 0x29;
 521         desc->bPwrOn2PwrGood = 10;      /* ehci 1.0, 2.3.9 says 20ms max */
 522         desc->bHubContrCurrent = 0;
 523
 524         desc->bNbrPorts = ports;
 525         temp = 1 + (ports / 8);
 526         desc->bDescLength = 7 + 2 * temp;
 527
 528         /* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
 529         memset (&desc->bitmap [0], 0, temp);
 530         memset (&desc->bitmap [temp], 0xff, temp);
 531
 532         temp = 0x0008;                  /* per-port overcurrent reporting */
 533         if (HCS_PPC (ehci->hcs_params))
 534                 temp |= 0x0001;         /* per-port power control */
 535         else
 536                 temp |= 0x0002;         /* no power switching */
 537 #if 0
 538 // re-enable when we support USB_PORT_FEAT_INDICATOR below.
 539         if (HCS_INDICATOR (ehci->hcs_params))
 540                 temp |= 0x0080;         /* per-port indicators (LEDs) */
 541 #endif
 542         desc->wHubCharacteristics = (__force __u16)cpu_to_le16 (temp);
 543 }
 544
 545 /*-------------------------------------------------------------------------*/
 546
 547 #define PORT_WAKE_BITS  (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
 548
 549 static int ehci_hub_control (
 550         struct usb_hcd  *hcd,
 551         u16             typeReq,
 552         u16             wValue,
 553         u16             wIndex,
 554         char            *buf,
 555         u16             wLength
 556 ) {
 557         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 558         int             ports = HCS_N_PORTS (ehci->hcs_params);
 559         u32 __iomem     *status_reg = &ehci->regs->port_status[
 560                                 (wIndex & 0xff) - 1];
 561         u32             temp, status;
 562         unsigned long   flags;
 563         int             retval = 0;
 564         unsigned        selector;
 565
 566         /*
 567          * FIXME:  support SetPortFeatures USB_PORT_FEAT_INDICATOR.
 568          * HCS_INDICATOR may say we can change LEDs to off/amber/green.
 569          * (track current state ourselves) ... blink for diagnostics,
 570          * power, "this is the one", etc.  EHCI spec supports this.
 571          */
 572
 573         spin_lock_irqsave (&ehci->lock, flags);
 574         switch (typeReq) {
 575         case ClearHubFeature:
 576                 switch (wValue) {
 577                 case C_HUB_LOCAL_POWER:
 578                 case C_HUB_OVER_CURRENT:
 579                         /* no hub-wide feature/status flags */
 580                         break;
 581                 default:
 582                         goto error;
 583                 }
 584                 break;
 585         case ClearPortFeature:
 586                 if (!wIndex || wIndex > ports)
 587                         goto error;
 588                 wIndex--;
 589                 temp = ehci_readl(ehci, status_reg);
 590
 591                 /*
 592                  * Even if OWNER is set, so the port is owned by the
 593                  * companion controller, khubd needs to be able to clear
 594                  * the port-change status bits (especially
 595                  * USB_PORT_FEAT_C_CONNECTION).
 596                  */
 597
 598                 switch (wValue) {
 599                 case USB_PORT_FEAT_ENABLE:
 600                         ehci_writel(ehci, temp & ~PORT_PE, status_reg);
 601                         break;
 602                 case USB_PORT_FEAT_C_ENABLE:
 603                         ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_PEC,
 604                                         status_reg);
 605                         break;
 606                 case USB_PORT_FEAT_SUSPEND:
 607                         if (temp & PORT_RESET)
 608                                 goto error;
 609                         if (ehci->no_selective_suspend)
 610                                 break;
 611                         if (temp & PORT_SUSPEND) {
 612                                 if ((temp & PORT_PE) == 0)
 613                                         goto error;
 614                                 /* resume signaling for 20 msec */
 615                                 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
 616                                 ehci_writel(ehci, temp | PORT_RESUME,
 617                                                 status_reg);
 618                                 ehci->reset_done [wIndex] = jiffies
 619                                                 + msecs_to_jiffies (20);
 620                         }
 621                         break;
 622                 case USB_PORT_FEAT_C_SUSPEND:
 623                         /* we auto-clear this feature */
 624                         break;
 625                 case USB_PORT_FEAT_POWER:
 626                         if (HCS_PPC (ehci->hcs_params))
 627                                 ehci_writel(ehci,
 628                                           temp & ~(PORT_RWC_BITS | PORT_POWER),
 629                                           status_reg);
 630                         break;
 631                 case USB_PORT_FEAT_C_CONNECTION:
 632                         ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_CSC,
 633                                         status_reg);
 634                         break;
 635                 case USB_PORT_FEAT_C_OVER_CURRENT:
 636                         ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_OCC,
 637                                         status_reg);
 638                         break;
 639                 case USB_PORT_FEAT_C_RESET:
 640                         /* GetPortStatus clears reset */
 641                         break;
 642                 default:
 643                         goto error;
 644                 }
 645                 ehci_readl(ehci, &ehci->regs->command); /* unblock posted write */
 646                 break;
 647         case GetHubDescriptor:
 648                 ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
 649                         buf);
 650                 break;
 651         case GetHubStatus:
 652                 /* no hub-wide feature/status flags */
 653                 memset (buf, 0, 4);
 654                 //cpu_to_le32s ((u32 *) buf);
 655                 break;
 656         case GetPortStatus:
 657                 if (!wIndex || wIndex > ports)
 658                         goto error;
 659                 wIndex--;
 660                 status = 0;
 661                 temp = ehci_readl(ehci, status_reg);
 662
 663                 // wPortChange bits
 664                 if (temp & PORT_CSC)
 665                         status |= 1 << USB_PORT_FEAT_C_CONNECTION;
 666                 if (temp & PORT_PEC)
 667                         status |= 1 << USB_PORT_FEAT_C_ENABLE;
 668
 669                 if ((temp & PORT_OCC) && !ignore_oc){
 670                         status |= 1 << USB_PORT_FEAT_C_OVER_CURRENT;
 671
 672                         /*
 673                          * Hubs should disable port power on over-current.
 674                          * However, not all EHCI implementations do this
 675                          * automatically, even if they _do_ support per-port
 676                          * power switching; they're allowed to just limit the
 677                          * current.  khubd will turn the power back on.
 678                          */
 679                         if (HCS_PPC (ehci->hcs_params)){
 680                                 ehci_writel(ehci,
 681                                         temp & ~(PORT_RWC_BITS | PORT_POWER),
 682                                         status_reg);
 683                         }
 684                 }
 685
 686                 /* whoever resumes must GetPortStatus to complete it!! */
 687                 if (temp & PORT_RESUME) {
 688
 689                         /* Remote Wakeup received? */
 690                         if (!ehci->reset_done[wIndex]) {
 691                                 /* resume signaling for 20 msec */
 692                                 ehci->reset_done[wIndex] = jiffies
 693                                                 + msecs_to_jiffies(20);
 694                                 /* check the port again */
 695                                 mod_timer(&ehci_to_hcd(ehci)->rh_timer,
 696                                                 ehci->reset_done[wIndex]);
 697                         }
 698
 699                         /* resume completed? */
 700                         else if (time_after_eq(jiffies,
 701                                         ehci->reset_done[wIndex])) {
 702                                 status |= 1 << USB_PORT_FEAT_C_SUSPEND;
 703                                 ehci->reset_done[wIndex] = 0;
 704
 705                                 /* stop resume signaling */
 706                                 temp = ehci_readl(ehci, status_reg);
 707                                 ehci_writel(ehci,
 708                                         temp & ~(PORT_RWC_BITS | PORT_RESUME),
 709                                         status_reg);
 710                                 retval = handshake(ehci, status_reg,
 711                                            PORT_RESUME, 0, 2000 /* 2msec */);
 712                                 if (retval != 0) {
 713                                         ehci_err(ehci,
 714                                                 "port %d resume error %d\n",
 715                                                 wIndex + 1, retval);
 716                                         goto error;
 717                                 }
 718                                 temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10));
 719                         }
 720                 }
 721
 722                 /* whoever resets must GetPortStatus to complete it!! */
 723                 if ((temp & PORT_RESET)
 724                                 && time_after_eq(jiffies,
 725                                         ehci->reset_done[wIndex])) {
 726                         status |= 1 << USB_PORT_FEAT_C_RESET;
 727                         ehci->reset_done [wIndex] = 0;
 728
 729                         /* force reset to complete */
 730                         ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESET),
 731                                         status_reg);
 732                         /* REVISIT:  some hardware needs 550+ usec to clear
 733                          * this bit; seems too long to spin routinely...
 734                          */
 735                         retval = handshake(ehci, status_reg,
 736                                         PORT_RESET, 0, 750);
 737                         if (retval != 0) {
 738                                 ehci_err (ehci, "port %d reset error %d\n",
 739                                         wIndex + 1, retval);
 740                                 goto error;
 741                         }
 742
 743                         /* see what we found out */
 744                         temp = check_reset_complete (ehci, wIndex, status_reg,
 745                                         ehci_readl(ehci, status_reg));
 746                 }
 747
 748                 /* transfer dedicated ports to the companion hc */
 749                 if ((temp & PORT_CONNECT) &&
 750                                 test_bit(wIndex, &ehci->companion_ports)) {
 751                         temp &= ~PORT_RWC_BITS;
 752                         temp |= PORT_OWNER;
 753                         ehci_writel(ehci, temp, status_reg);
 754                         ehci_dbg(ehci, "port %d --> companion\n", wIndex + 1);
 755                         temp = ehci_readl(ehci, status_reg);
 756                 }
 757
 758                 /*
 759                  * Even if OWNER is set, there's no harm letting khubd
 760                  * see the wPortStatus values (they should all be 0 except
 761                  * for PORT_POWER anyway).
 762                  */
 763
 764                 if (temp & PORT_CONNECT) {
 765                         status |= 1 << USB_PORT_FEAT_CONNECTION;
 766                         // status may be from integrated TT
 767                         status |= ehci_port_speed(ehci, temp);
 768                 }
 769                 if (temp & PORT_PE)
 770                         status |= 1 << USB_PORT_FEAT_ENABLE;
 771                 if (temp & (PORT_SUSPEND|PORT_RESUME))
 772                         status |= 1 << USB_PORT_FEAT_SUSPEND;
 773                 if (temp & PORT_OC)
 774                         status |= 1 << USB_PORT_FEAT_OVER_CURRENT;
 775                 if (temp & PORT_RESET)
 776                         status |= 1 << USB_PORT_FEAT_RESET;
 777                 if (temp & PORT_POWER)
 778                         status |= 1 << USB_PORT_FEAT_POWER;
 779
 780 #ifndef EHCI_VERBOSE_DEBUG
 781         if (status & ~0xffff)   /* only if wPortChange is interesting */
 782 #endif
 783                 dbg_port (ehci, "GetStatus", wIndex + 1, temp);
 784                 put_unaligned(cpu_to_le32 (status), (__le32 *) buf);
 785                 break;
 786         case SetHubFeature:
 787                 switch (wValue) {
 788                 case C_HUB_LOCAL_POWER:
 789                 case C_HUB_OVER_CURRENT:
 790                         /* no hub-wide feature/status flags */
 791                         break;
 792                 default:
 793                         goto error;
 794                 }
 795                 break;
 796         case SetPortFeature:
 797                 selector = wIndex >> 8;
 798                 wIndex &= 0xff;
 799                 if (!wIndex || wIndex > ports)
 800                         goto error;
 801                 wIndex--;
 802                 temp = ehci_readl(ehci, status_reg);
 803                 if (temp & PORT_OWNER)
 804                         break;
 805
 806                 temp &= ~PORT_RWC_BITS;
 807                 switch (wValue) {
 808                 case USB_PORT_FEAT_SUSPEND:
 809                         if (ehci->no_selective_suspend)
 810                                 break;
 811                         if ((temp & PORT_PE) == 0
 812                                         || (temp & PORT_RESET) != 0)
 813                                 goto error;
 814                         if (device_may_wakeup(&hcd->self.root_hub->dev))
 815                                 temp |= PORT_WAKE_BITS;
 816                         ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
 817                         break;
 818                 case USB_PORT_FEAT_POWER:
 819                         if (HCS_PPC (ehci->hcs_params))
 820                                 ehci_writel(ehci, temp | PORT_POWER,
 821                                                 status_reg);
 822                         break;
 823                 case USB_PORT_FEAT_RESET:
 824                         if (temp & PORT_RESUME)
 825                                 goto error;
 826                         /* line status bits may report this as low speed,
 827                          * which can be fine if this root hub has a
 828                          * transaction translator built in.
 829                          */
 830                         if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
 831                                         && !ehci_is_TDI(ehci)
 832                                         && PORT_USB11 (temp)) {
 833                                 ehci_dbg (ehci,
 834                                         "port %d low speed --> companion\n",
 835                                         wIndex + 1);
 836                                 temp |= PORT_OWNER;
 837                         } else {
 838                                 ehci_vdbg (ehci, "port %d reset\n", wIndex + 1);
 839                                 temp |= PORT_RESET;
 840                                 temp &= ~PORT_PE;
 841
 842                                 /*
 843                                  * caller must wait, then call GetPortStatus
 844                                  * usb 2.0 spec says 50 ms resets on root
 845                                  */
 846                                 ehci->reset_done [wIndex] = jiffies
 847                                                 + msecs_to_jiffies (50);
 848                         }
 849                         ehci_writel(ehci, temp, status_reg);
 850                         break;
 851
 852                 /* For downstream facing ports (these):  one hub port is put
 853                  * into test mode according to USB2 11.24.2.13, then the hub
 854                  * must be reset (which for root hub now means rmmod+modprobe,
 855                  * or else system reboot).  See EHCI 2.3.9 and 4.14 for info
 856                  * about the EHCI-specific stuff.
 857                  */
 858                 case USB_PORT_FEAT_TEST:
 859                         if (!selector || selector > 5)
 860                                 goto error;
 861                         ehci_quiesce(ehci);
 862                         ehci_halt(ehci);
 863                         temp |= selector << 16;
 864                         ehci_writel(ehci, temp, status_reg);
 865                         break;
 866
 867                 default:
 868                         goto error;
 869                 }
 870                 ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
 871                 break;
 872
 873         default:
 874 error:
 875                 /* "stall" on error */
 876                 retval = -EPIPE;
 877         }
 878         spin_unlock_irqrestore (&ehci->lock, flags);
 879         return retval;
 880 }
 881
 882 static void ehci_relinquish_port(struct usb_hcd *hcd, int portnum)
 883 {
 884         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
 885
 886         if (ehci_is_TDI(ehci))
 887                 return;
 888         set_owner(ehci, --portnum, PORT_OWNER);
 889 }
 890