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 #define PORT_WAKE_BITS  (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
  32
  33 #ifdef  CONFIG_PM
  34
  35 static int ehci_hub_control(
  36         struct usb_hcd  *hcd,
  37         u16             typeReq,
  38         u16             wValue,
  39         u16             wIndex,
  40         char            *buf,
  41         u16             wLength
  42 );
  43
  44 /* After a power loss, ports that were owned by the companion must be
  45  * reset so that the companion can still own them.
  46  */
  47 static void ehci_handover_companion_ports(struct ehci_hcd *ehci)
  48 {
  49         u32 __iomem     *reg;
  50         u32             status;
  51         int             port;
  52         __le32          buf;
  53         struct usb_hcd  *hcd = ehci_to_hcd(ehci);
  54
  55         if (!ehci->owned_ports)
  56                 return;
  57
  58         /* Give the connections some time to appear */
  59         msleep(20);
  60
  61         port = HCS_N_PORTS(ehci->hcs_params);
  62         while (port--) {
  63                 if (test_bit(port, &ehci->owned_ports)) {
  64                         reg = &ehci->regs->port_status[port];
  65                         status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
  66
  67                         /* Port already owned by companion? */
  68                         if (status & PORT_OWNER)
  69                                 clear_bit(port, &ehci->owned_ports);
  70                         else if (test_bit(port, &ehci->companion_ports))
  71                                 ehci_writel(ehci, status & ~PORT_PE, reg);
  72                         else
  73                                 ehci_hub_control(hcd, SetPortFeature,
  74                                                 USB_PORT_FEAT_RESET, port + 1,
  75                                                 NULL, 0);
  76                 }
  77         }
  78
  79         if (!ehci->owned_ports)
  80                 return;
  81         msleep(90);             /* Wait for resets to complete */
  82
  83         port = HCS_N_PORTS(ehci->hcs_params);
  84         while (port--) {
  85                 if (test_bit(port, &ehci->owned_ports)) {
  86                         ehci_hub_control(hcd, GetPortStatus,
  87                                         0, port + 1,
  88                                         (char *) &buf, sizeof(buf));
  89
  90                         /* The companion should now own the port,
  91                          * but if something went wrong the port must not
  92                          * remain enabled.
  93                          */
  94                         reg = &ehci->regs->port_status[port];
  95                         status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
  96                         if (status & PORT_OWNER)
  97                                 ehci_writel(ehci, status | PORT_CSC, reg);
  98                         else {
  99                                 ehci_dbg(ehci, "failed handover port %d: %x\n",
 100                                                 port + 1, status);
 101                                 ehci_writel(ehci, status & ~PORT_PE, reg);
 102                         }
 103                 }
 104         }
 105
 106         ehci->owned_ports = 0;
 107 }
 108
 109 static int ehci_bus_suspend (struct usb_hcd *hcd)
 110 {
 111         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 112         int                     port;
 113         int                     mask;
 114
 115         ehci_dbg(ehci, "suspend root hub\n");
 116
 117         if (time_before (jiffies, ehci->next_statechange))
 118                 msleep(5);
 119         del_timer_sync(&ehci->watchdog);
 120         del_timer_sync(&ehci->iaa_watchdog);
 121
 122         port = HCS_N_PORTS (ehci->hcs_params);
 123         spin_lock_irq (&ehci->lock);
 124
 125         /* stop schedules, clean any completed work */
 126         if (HC_IS_RUNNING(hcd->state)) {
 127                 ehci_quiesce (ehci);
 128                 hcd->state = HC_STATE_QUIESCING;
 129         }
 130         ehci->command = ehci_readl(ehci, &ehci->regs->command);
 131         ehci_work(ehci);
 132
 133         /* Unlike other USB host controller types, EHCI doesn't have
 134          * any notion of "global" or bus-wide suspend.  The driver has
 135          * to manually suspend all the active unsuspended ports, and
 136          * then manually resume them in the bus_resume() routine.
 137          */
 138         ehci->bus_suspended = 0;
 139         ehci->owned_ports = 0;
 140         while (port--) {
 141                 u32 __iomem     *reg = &ehci->regs->port_status [port];
 142                 u32             t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
 143                 u32             t2 = t1;
 144
 145                 /* keep track of which ports we suspend */
 146                 if (t1 & PORT_OWNER)
 147                         set_bit(port, &ehci->owned_ports);
 148                 else if ((t1 & PORT_PE) && !(t1 & PORT_SUSPEND)) {
 149                         t2 |= PORT_SUSPEND;
 150                         set_bit(port, &ehci->bus_suspended);
 151                 }
 152
 153                 /* enable remote wakeup on all ports */
 154                 if (hcd->self.root_hub->do_remote_wakeup)
 155                         t2 |= PORT_WAKE_BITS;
 156                 else
 157                         t2 &= ~PORT_WAKE_BITS;
 158
 159                 if (t1 != t2) {
 160                         ehci_vdbg (ehci, "port %d, %08x -> %08x\n",
 161                                 port + 1, t1, t2);
 162                         ehci_writel(ehci, t2, reg);
 163                 }
 164         }
 165
 166         /* Apparently some devices need a >= 1-uframe delay here */
 167         if (ehci->bus_suspended)
 168                 udelay(150);
 169
 170         /* turn off now-idle HC */
 171         ehci_halt (ehci);
 172         hcd->state = HC_STATE_SUSPENDED;
 173
 174         if (ehci->reclaim)
 175                 end_unlink_async(ehci);
 176
 177         /* allow remote wakeup */
 178         mask = INTR_MASK;
 179         if (!hcd->self.root_hub->do_remote_wakeup)
 180                 mask &= ~STS_PCD;
 181         ehci_writel(ehci, mask, &ehci->regs->intr_enable);
 182         ehci_readl(ehci, &ehci->regs->intr_enable);
 183
 184         ehci->next_statechange = jiffies + msecs_to_jiffies(10);
 185         spin_unlock_irq (&ehci->lock);
 186         return 0;
 187 }
 188
 189
 190 /* caller has locked the root hub, and should reset/reinit on error */
 191 static int ehci_bus_resume (struct usb_hcd *hcd)
 192 {
 193         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 194         u32                     temp;
 195         u32                     power_okay;
 196         int                     i;
 197
 198         if (time_before (jiffies, ehci->next_statechange))
 199                 msleep(5);
 200         spin_lock_irq (&ehci->lock);
 201         if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
 202                 spin_unlock_irq(&ehci->lock);
 203                 return -ESHUTDOWN;
 204         }
 205
 206         /* Ideally and we've got a real resume here, and no port's power
 207          * was lost.  (For PCI, that means Vaux was maintained.)  But we
 208          * could instead be restoring a swsusp snapshot -- so that BIOS was
 209          * the last user of the controller, not reset/pm hardware keeping
 210          * state we gave to it.
 211          */
 212         power_okay = ehci_readl(ehci, &ehci->regs->intr_enable);
 213         ehci_dbg(ehci, "resume root hub%s\n",
 214                         power_okay ? "" : " after power loss");
 215
 216         /* at least some APM implementations will try to deliver
 217          * IRQs right away, so delay them until we're ready.
 218          */
 219         ehci_writel(ehci, 0, &ehci->regs->intr_enable);
 220
 221         /* re-init operational registers */
 222         ehci_writel(ehci, 0, &ehci->regs->segment);
 223         ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
 224         ehci_writel(ehci, (u32) ehci->async->qh_dma, &ehci->regs->async_next);
 225
 226         /* restore CMD_RUN, framelist size, and irq threshold */
 227         ehci_writel(ehci, ehci->command, &ehci->regs->command);
 228
 229         /* Some controller/firmware combinations need a delay during which
 230          * they set up the port statuses.  See Bugzilla #8190. */
 231         mdelay(8);
 232
 233         /* manually resume the ports we suspended during bus_suspend() */
 234         i = HCS_N_PORTS (ehci->hcs_params);
 235         while (i--) {
 236                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 237                 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
 238                 if (test_bit(i, &ehci->bus_suspended) &&
 239                                 (temp & PORT_SUSPEND))
 240                         temp |= PORT_RESUME;
 241                 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
 242         }
 243         i = HCS_N_PORTS (ehci->hcs_params);
 244         mdelay (20);
 245         while (i--) {
 246                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 247                 if (test_bit(i, &ehci->bus_suspended) &&
 248                                 (temp & PORT_SUSPEND)) {
 249                         temp &= ~(PORT_RWC_BITS | PORT_RESUME);
 250                         ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
 251                         ehci_vdbg (ehci, "resumed port %d\n", i + 1);
 252                 }
 253         }
 254         (void) ehci_readl(ehci, &ehci->regs->command);
 255
 256         /* maybe re-activate the schedule(s) */
 257         temp = 0;
 258         if (ehci->async->qh_next.qh)
 259                 temp |= CMD_ASE;
 260         if (ehci->periodic_sched)
 261                 temp |= CMD_PSE;
 262         if (temp) {
 263                 ehci->command |= temp;
 264                 ehci_writel(ehci, ehci->command, &ehci->regs->command);
 265         }
 266
 267         ehci->next_statechange = jiffies + msecs_to_jiffies(5);
 268         hcd->state = HC_STATE_RUNNING;
 269
 270         /* Now we can safely re-enable irqs */
 271         ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
 272
 273         spin_unlock_irq (&ehci->lock);
 274         ehci_handover_companion_ports(ehci);
 275         return 0;
 276 }
 277
 278 #else
 279
 280 #define ehci_bus_suspend        NULL
 281 #define ehci_bus_resume         NULL
 282
 283 #endif  /* CONFIG_PM */
 284
 285 /*-------------------------------------------------------------------------*/
 286
 287 /* Display the ports dedicated to the companion controller */
 288 static ssize_t show_companion(struct device *dev,
 289                               struct device_attribute *attr,
 290                               char *buf)
 291 {
 292         struct ehci_hcd         *ehci;
 293         int                     nports, index, n;
 294         int                     count = PAGE_SIZE;
 295         char                    *ptr = buf;
 296
 297         ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
 298         nports = HCS_N_PORTS(ehci->hcs_params);
 299
 300         for (index = 0; index < nports; ++index) {
 301                 if (test_bit(index, &ehci->companion_ports)) {
 302                         n = scnprintf(ptr, count, "%d\n", index + 1);
 303                         ptr += n;
 304                         count -= n;
 305                 }
 306         }
 307         return ptr - buf;
 308 }
 309
 310 /*
 311  * Sets the owner of a port
 312  */
 313 static void set_owner(struct ehci_hcd *ehci, int portnum, int new_owner)
 314 {
 315         u32 __iomem             *status_reg;
 316         u32                     port_status;
 317         int                     try;
 318
 319         status_reg = &ehci->regs->port_status[portnum];
 320
 321         /*
 322          * The controller won't set the OWNER bit if the port is
 323          * enabled, so this loop will sometimes require at least two
 324          * iterations: one to disable the port and one to set OWNER.
 325          */
 326         for (try = 4; try > 0; --try) {
 327                 spin_lock_irq(&ehci->lock);
 328                 port_status = ehci_readl(ehci, status_reg);
 329                 if ((port_status & PORT_OWNER) == new_owner
 330                                 || (port_status & (PORT_OWNER | PORT_CONNECT))
 331                                         == 0)
 332                         try = 0;
 333                 else {
 334                         port_status ^= PORT_OWNER;
 335                         port_status &= ~(PORT_PE | PORT_RWC_BITS);
 336                         ehci_writel(ehci, port_status, status_reg);
 337                 }
 338                 spin_unlock_irq(&ehci->lock);
 339                 if (try > 1)
 340                         msleep(5);
 341         }
 342 }
 343
 344 /*
 345  * Dedicate or undedicate a port to the companion controller.
 346  * Syntax is "[-]portnum", where a leading '-' sign means
 347  * return control of the port to the EHCI controller.
 348  */
 349 static ssize_t store_companion(struct device *dev,
 350                                struct device_attribute *attr,
 351                                const char *buf, size_t count)
 352 {
 353         struct ehci_hcd         *ehci;
 354         int                     portnum, new_owner;
 355
 356         ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
 357         new_owner = PORT_OWNER;         /* Owned by companion */
 358         if (sscanf(buf, "%d", &portnum) != 1)
 359                 return -EINVAL;
 360         if (portnum < 0) {
 361                 portnum = - portnum;
 362                 new_owner = 0;          /* Owned by EHCI */
 363         }
 364         if (portnum <= 0 || portnum > HCS_N_PORTS(ehci->hcs_params))
 365                 return -ENOENT;
 366         portnum--;
 367         if (new_owner)
 368                 set_bit(portnum, &ehci->companion_ports);
 369         else
 370                 clear_bit(portnum, &ehci->companion_ports);
 371         set_owner(ehci, portnum, new_owner);
 372         return count;
 373 }
 374 static DEVICE_ATTR(companion, 0644, show_companion, store_companion);
 375
 376 static inline void create_companion_file(struct ehci_hcd *ehci)
 377 {
 378         int     i;
 379
 380         /* with integrated TT there is no companion! */
 381         if (!ehci_is_TDI(ehci))
 382                 i = device_create_file(ehci_to_hcd(ehci)->self.dev,
 383                                        &dev_attr_companion);
 384 }
 385
 386 static inline void remove_companion_file(struct ehci_hcd *ehci)
 387 {
 388         /* with integrated TT there is no companion! */
 389         if (!ehci_is_TDI(ehci))
 390                 device_remove_file(ehci_to_hcd(ehci)->self.dev,
 391                                    &dev_attr_companion);
 392 }
 393
 394
 395 /*-------------------------------------------------------------------------*/
 396
 397 static int check_reset_complete (
 398         struct ehci_hcd *ehci,
 399         int             index,
 400         u32 __iomem     *status_reg,
 401         int             port_status
 402 ) {
 403         if (!(port_status & PORT_CONNECT))
 404                 return port_status;
 405
 406         /* if reset finished and it's still not enabled -- handoff */
 407         if (!(port_status & PORT_PE)) {
 408
 409                 /* with integrated TT, there's nobody to hand it to! */
 410                 if (ehci_is_TDI(ehci)) {
 411                         ehci_dbg (ehci,
 412                                 "Failed to enable port %d on root hub TT\n",
 413                                 index+1);
 414                         return port_status;
 415                 }
 416
 417                 ehci_dbg (ehci, "port %d full speed --> companion\n",
 418                         index + 1);
 419
 420                 // what happens if HCS_N_CC(params) == 0 ?
 421                 port_status |= PORT_OWNER;
 422                 port_status &= ~PORT_RWC_BITS;
 423                 ehci_writel(ehci, port_status, status_reg);
 424
 425         } else
 426                 ehci_dbg (ehci, "port %d high speed\n", index + 1);
 427
 428         return port_status;
 429 }
 430
 431 /*-------------------------------------------------------------------------*/
 432
 433
 434 /* build "status change" packet (one or two bytes) from HC registers */
 435
 436 static int
 437 ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
 438 {
 439         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 440         u32             temp, status = 0;
 441         u32             mask;
 442         int             ports, i, retval = 1;
 443         unsigned long   flags;
 444
 445         /* if !USB_SUSPEND, root hub timers won't get shut down ... */
 446         if (!HC_IS_RUNNING(hcd->state))
 447                 return 0;
 448
 449         /* init status to no-changes */
 450         buf [0] = 0;
 451         ports = HCS_N_PORTS (ehci->hcs_params);
 452         if (ports > 7) {
 453                 buf [1] = 0;
 454                 retval++;
 455         }
 456
 457         /* Some boards (mostly VIA?) report bogus overcurrent indications,
 458          * causing massive log spam unless we completely ignore them.  It
 459          * may be relevant that VIA VT8235 controllers, where PORT_POWER is
 460          * always set, seem to clear PORT_OCC and PORT_CSC when writing to
 461          * PORT_POWER; that's surprising, but maybe within-spec.
 462          */
 463         if (!ignore_oc)
 464                 mask = PORT_CSC | PORT_PEC | PORT_OCC;
 465         else
 466                 mask = PORT_CSC | PORT_PEC;
 467         // PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
 468
 469         /* no hub change reports (bit 0) for now (power, ...) */
 470
 471         /* port N changes (bit N)? */
 472         spin_lock_irqsave (&ehci->lock, flags);
 473         for (i = 0; i < ports; i++) {
 474                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 475
 476                 /*
 477                  * Return status information even for ports with OWNER set.
 478                  * Otherwise khubd wouldn't see the disconnect event when a
 479                  * high-speed device is switched over to the companion
 480                  * controller by the user.
 481                  */
 482
 483                 if ((temp & mask) != 0 || test_bit(i, &ehci->port_c_suspend)
 484                                 || (ehci->reset_done[i] && time_after_eq(
 485                                         jiffies, ehci->reset_done[i]))) {
 486                         if (i < 7)
 487                             buf [0] |= 1 << (i + 1);
 488                         else
 489                             buf [1] |= 1 << (i - 7);
 490                         status = STS_PCD;
 491                 }
 492         }
 493         /* FIXME autosuspend idle root hubs */
 494         spin_unlock_irqrestore (&ehci->lock, flags);
 495         return status ? retval : 0;
 496 }
 497
 498 /*-------------------------------------------------------------------------*/
 499
 500 static void
 501 ehci_hub_descriptor (
 502         struct ehci_hcd                 *ehci,
 503         struct usb_hub_descriptor       *desc
 504 ) {
 505         int             ports = HCS_N_PORTS (ehci->hcs_params);
 506         u16             temp;
 507
 508         desc->bDescriptorType = 0x29;
 509         desc->bPwrOn2PwrGood = 10;      /* ehci 1.0, 2.3.9 says 20ms max */
 510         desc->bHubContrCurrent = 0;
 511
 512         desc->bNbrPorts = ports;
 513         temp = 1 + (ports / 8);
 514         desc->bDescLength = 7 + 2 * temp;
 515
 516         /* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
 517         memset (&desc->bitmap [0], 0, temp);
 518         memset (&desc->bitmap [temp], 0xff, temp);
 519
 520         temp = 0x0008;                  /* per-port overcurrent reporting */
 521         if (HCS_PPC (ehci->hcs_params))
 522                 temp |= 0x0001;         /* per-port power control */
 523         else
 524                 temp |= 0x0002;         /* no power switching */
 525 #if 0
 526 // re-enable when we support USB_PORT_FEAT_INDICATOR below.
 527         if (HCS_INDICATOR (ehci->hcs_params))
 528                 temp |= 0x0080;         /* per-port indicators (LEDs) */
 529 #endif
 530         desc->wHubCharacteristics = cpu_to_le16(temp);
 531 }
 532
 533 /*-------------------------------------------------------------------------*/
 534
 535 static int ehci_hub_control (
 536         struct usb_hcd  *hcd,
 537         u16             typeReq,
 538         u16             wValue,
 539         u16             wIndex,
 540         char            *buf,
 541         u16             wLength
 542 ) {
 543         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 544         int             ports = HCS_N_PORTS (ehci->hcs_params);
 545         u32 __iomem     *status_reg = &ehci->regs->port_status[
 546                                 (wIndex & 0xff) - 1];
 547         u32             temp, status;
 548         unsigned long   flags;
 549         int             retval = 0;
 550         unsigned        selector;
 551
 552         /*
 553          * FIXME:  support SetPortFeatures USB_PORT_FEAT_INDICATOR.
 554          * HCS_INDICATOR may say we can change LEDs to off/amber/green.
 555          * (track current state ourselves) ... blink for diagnostics,
 556          * power, "this is the one", etc.  EHCI spec supports this.
 557          */
 558
 559         spin_lock_irqsave (&ehci->lock, flags);
 560         switch (typeReq) {
 561         case ClearHubFeature:
 562                 switch (wValue) {
 563                 case C_HUB_LOCAL_POWER:
 564                 case C_HUB_OVER_CURRENT:
 565                         /* no hub-wide feature/status flags */
 566                         break;
 567                 default:
 568                         goto error;
 569                 }
 570                 break;
 571         case ClearPortFeature:
 572                 if (!wIndex || wIndex > ports)
 573                         goto error;
 574                 wIndex--;
 575                 temp = ehci_readl(ehci, status_reg);
 576
 577                 /*
 578                  * Even if OWNER is set, so the port is owned by the
 579                  * companion controller, khubd needs to be able to clear
 580                  * the port-change status bits (especially
 581                  * USB_PORT_FEAT_C_CONNECTION).
 582                  */
 583
 584                 switch (wValue) {
 585                 case USB_PORT_FEAT_ENABLE:
 586                         ehci_writel(ehci, temp & ~PORT_PE, status_reg);
 587                         break;
 588                 case USB_PORT_FEAT_C_ENABLE:
 589                         ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_PEC,
 590                                         status_reg);
 591                         break;
 592                 case USB_PORT_FEAT_SUSPEND:
 593                         if (temp & PORT_RESET)
 594                                 goto error;
 595                         if (ehci->no_selective_suspend)
 596                                 break;
 597                         if (temp & PORT_SUSPEND) {
 598                                 if ((temp & PORT_PE) == 0)
 599                                         goto error;
 600                                 /* resume signaling for 20 msec */
 601                                 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
 602                                 ehci_writel(ehci, temp | PORT_RESUME,
 603                                                 status_reg);
 604                                 ehci->reset_done [wIndex] = jiffies
 605                                                 + msecs_to_jiffies (20);
 606                         }
 607                         break;
 608                 case USB_PORT_FEAT_C_SUSPEND:
 609                         clear_bit(wIndex, &ehci->port_c_suspend);
 610                         break;
 611                 case USB_PORT_FEAT_POWER:
 612                         if (HCS_PPC (ehci->hcs_params))
 613                                 ehci_writel(ehci,
 614                                           temp & ~(PORT_RWC_BITS | PORT_POWER),
 615                                           status_reg);
 616                         break;
 617                 case USB_PORT_FEAT_C_CONNECTION:
 618                         ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_CSC,
 619                                         status_reg);
 620                         break;
 621                 case USB_PORT_FEAT_C_OVER_CURRENT:
 622                         ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_OCC,
 623                                         status_reg);
 624                         break;
 625                 case USB_PORT_FEAT_C_RESET:
 626                         /* GetPortStatus clears reset */
 627                         break;
 628                 default:
 629                         goto error;
 630                 }
 631                 ehci_readl(ehci, &ehci->regs->command); /* unblock posted write */
 632                 break;
 633         case GetHubDescriptor:
 634                 ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
 635                         buf);
 636                 break;
 637         case GetHubStatus:
 638                 /* no hub-wide feature/status flags */
 639                 memset (buf, 0, 4);
 640                 //cpu_to_le32s ((u32 *) buf);
 641                 break;
 642         case GetPortStatus:
 643                 if (!wIndex || wIndex > ports)
 644                         goto error;
 645                 wIndex--;
 646                 status = 0;
 647                 temp = ehci_readl(ehci, status_reg);
 648
 649                 // wPortChange bits
 650                 if (temp & PORT_CSC)
 651                         status |= 1 << USB_PORT_FEAT_C_CONNECTION;
 652                 if (temp & PORT_PEC)
 653                         status |= 1 << USB_PORT_FEAT_C_ENABLE;
 654
 655                 if ((temp & PORT_OCC) && !ignore_oc){
 656                         status |= 1 << USB_PORT_FEAT_C_OVER_CURRENT;
 657
 658                         /*
 659                          * Hubs should disable port power on over-current.
 660                          * However, not all EHCI implementations do this
 661                          * automatically, even if they _do_ support per-port
 662                          * power switching; they're allowed to just limit the
 663                          * current.  khubd will turn the power back on.
 664                          */
 665                         if (HCS_PPC (ehci->hcs_params)){
 666                                 ehci_writel(ehci,
 667                                         temp & ~(PORT_RWC_BITS | PORT_POWER),
 668                                         status_reg);
 669                         }
 670                 }
 671
 672                 /* whoever resumes must GetPortStatus to complete it!! */
 673                 if (temp & PORT_RESUME) {
 674
 675                         /* Remote Wakeup received? */
 676                         if (!ehci->reset_done[wIndex]) {
 677                                 /* resume signaling for 20 msec */
 678                                 ehci->reset_done[wIndex] = jiffies
 679                                                 + msecs_to_jiffies(20);
 680                                 /* check the port again */
 681                                 mod_timer(&ehci_to_hcd(ehci)->rh_timer,
 682                                                 ehci->reset_done[wIndex]);
 683                         }
 684
 685                         /* resume completed? */
 686                         else if (time_after_eq(jiffies,
 687                                         ehci->reset_done[wIndex])) {
 688                                 clear_bit(wIndex, &ehci->suspended_ports);
 689                                 set_bit(wIndex, &ehci->port_c_suspend);
 690                                 ehci->reset_done[wIndex] = 0;
 691
 692                                 /* stop resume signaling */
 693                                 temp = ehci_readl(ehci, status_reg);
 694                                 ehci_writel(ehci,
 695                                         temp & ~(PORT_RWC_BITS | PORT_RESUME),
 696                                         status_reg);
 697                                 retval = handshake(ehci, status_reg,
 698                                            PORT_RESUME, 0, 2000 /* 2msec */);
 699                                 if (retval != 0) {
 700                                         ehci_err(ehci,
 701                                                 "port %d resume error %d\n",
 702                                                 wIndex + 1, retval);
 703                                         goto error;
 704                                 }
 705                                 temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10));
 706                         }
 707                 }
 708
 709                 /* whoever resets must GetPortStatus to complete it!! */
 710                 if ((temp & PORT_RESET)
 711                                 && time_after_eq(jiffies,
 712                                         ehci->reset_done[wIndex])) {
 713                         status |= 1 << USB_PORT_FEAT_C_RESET;
 714                         ehci->reset_done [wIndex] = 0;
 715
 716                         /* force reset to complete */
 717                         ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESET),
 718                                         status_reg);
 719                         /* REVISIT:  some hardware needs 550+ usec to clear
 720                          * this bit; seems too long to spin routinely...
 721                          */
 722                         retval = handshake(ehci, status_reg,
 723                                         PORT_RESET, 0, 750);
 724                         if (retval != 0) {
 725                                 ehci_err (ehci, "port %d reset error %d\n",
 726                                         wIndex + 1, retval);
 727                                 goto error;
 728                         }
 729
 730                         /* see what we found out */
 731                         temp = check_reset_complete (ehci, wIndex, status_reg,
 732                                         ehci_readl(ehci, status_reg));
 733                 }
 734
 735                 if (!(temp & (PORT_RESUME|PORT_RESET)))
 736                         ehci->reset_done[wIndex] = 0;
 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
 762                 /* maybe the port was unsuspended without our knowledge */
 763                 if (temp & (PORT_SUSPEND|PORT_RESUME)) {
 764                         status |= 1 << USB_PORT_FEAT_SUSPEND;
 765                 } else if (test_bit(wIndex, &ehci->suspended_ports)) {
 766                         clear_bit(wIndex, &ehci->suspended_ports);
 767                         ehci->reset_done[wIndex] = 0;
 768                         if (temp & PORT_PE)
 769                                 set_bit(wIndex, &ehci->port_c_suspend);
 770                 }
 771
 772                 if (temp & PORT_OC)
 773                         status |= 1 << USB_PORT_FEAT_OVER_CURRENT;
 774                 if (temp & PORT_RESET)
 775                         status |= 1 << USB_PORT_FEAT_RESET;
 776                 if (temp & PORT_POWER)
 777                         status |= 1 << USB_PORT_FEAT_POWER;
 778                 if (test_bit(wIndex, &ehci->port_c_suspend))
 779                         status |= 1 << USB_PORT_FEAT_C_SUSPEND;
 780
 781 #ifndef VERBOSE_DEBUG
 782         if (status & ~0xffff)   /* only if wPortChange is interesting */
 783 #endif
 784                 dbg_port (ehci, "GetStatus", wIndex + 1, temp);
 785                 put_unaligned_le32(status, buf);
 786                 break;
 787         case SetHubFeature:
 788                 switch (wValue) {
 789                 case C_HUB_LOCAL_POWER:
 790                 case C_HUB_OVER_CURRENT:
 791                         /* no hub-wide feature/status flags */
 792                         break;
 793                 default:
 794                         goto error;
 795                 }
 796                 break;
 797         case SetPortFeature:
 798                 selector = wIndex >> 8;
 799                 wIndex &= 0xff;
 800                 if (!wIndex || wIndex > ports)
 801                         goto error;
 802                 wIndex--;
 803                 temp = ehci_readl(ehci, status_reg);
 804                 if (temp & PORT_OWNER)
 805                         break;
 806
 807                 temp &= ~PORT_RWC_BITS;
 808                 switch (wValue) {
 809                 case USB_PORT_FEAT_SUSPEND:
 810                         if (ehci->no_selective_suspend)
 811                                 break;
 812                         if ((temp & PORT_PE) == 0
 813                                         || (temp & PORT_RESET) != 0)
 814                                 goto error;
 815                         ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
 816                         set_bit(wIndex, &ehci->suspended_ports);
 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
 891 static int ehci_port_handed_over(struct usb_hcd *hcd, int portnum)
 892 {
 893         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
 894         u32 __iomem             *reg;
 895
 896         if (ehci_is_TDI(ehci))
 897                 return 0;
 898         reg = &ehci->regs->port_status[portnum - 1];
 899         return ehci_readl(ehci, reg) & PORT_OWNER;
 900 }