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