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