git.oblomov.eu Git - linux-2.6/blob - drivers/usb/host/ehci-hub.c

   1 /*
   2  * Copyright (C) 2001-2004 by David Brownell
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License as published by the
   6  * Free Software Foundation; either version 2 of the License, or (at your
   7  * option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  11  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software Foundation,
  16  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17  */
  18
  19 /* this file is part of ehci-hcd.c */
  20
  21 /*-------------------------------------------------------------------------*/
  22
  23 /*
  24  * EHCI Root Hub ... the nonsharable stuff
  25  *
  26  * Registers don't need cpu_to_le32, that happens transparently
  27  */
  28
  29 /*-------------------------------------------------------------------------*/
  30
  31 #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                         ehci->reset_done [i] = jiffies + msecs_to_jiffies (20);
 241                         temp |= PORT_RESUME;
 242                 }
 243                 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
 244         }
 245         i = HCS_N_PORTS (ehci->hcs_params);
 246         mdelay (20);
 247         while (i--) {
 248                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 249                 if (test_bit(i, &ehci->bus_suspended) &&
 250                                 (temp & PORT_SUSPEND)) {
 251                         temp &= ~(PORT_RWC_BITS | PORT_RESUME);
 252                         ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
 253                         ehci_vdbg (ehci, "resumed port %d\n", i + 1);
 254                 }
 255         }
 256         (void) ehci_readl(ehci, &ehci->regs->command);
 257
 258         /* maybe re-activate the schedule(s) */
 259         temp = 0;
 260         if (ehci->async->qh_next.qh)
 261                 temp |= CMD_ASE;
 262         if (ehci->periodic_sched)
 263                 temp |= CMD_PSE;
 264         if (temp) {
 265                 ehci->command |= temp;
 266                 ehci_writel(ehci, ehci->command, &ehci->regs->command);
 267         }
 268
 269         ehci->next_statechange = jiffies + msecs_to_jiffies(5);
 270         hcd->state = HC_STATE_RUNNING;
 271
 272         /* Now we can safely re-enable irqs */
 273         ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
 274
 275         spin_unlock_irq (&ehci->lock);
 276         ehci_handover_companion_ports(ehci);
 277         return 0;
 278 }
 279
 280 #else
 281
 282 #define ehci_bus_suspend        NULL
 283 #define ehci_bus_resume         NULL
 284
 285 #endif  /* CONFIG_PM */
 286
 287 /*-------------------------------------------------------------------------*/
 288
 289 /* Display the ports dedicated to the companion controller */
 290 static ssize_t show_companion(struct device *dev,
 291                               struct device_attribute *attr,
 292                               char *buf)
 293 {
 294         struct ehci_hcd         *ehci;
 295         int                     nports, index, n;
 296         int                     count = PAGE_SIZE;
 297         char                    *ptr = buf;
 298
 299         ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
 300         nports = HCS_N_PORTS(ehci->hcs_params);
 301
 302         for (index = 0; index < nports; ++index) {
 303                 if (test_bit(index, &ehci->companion_ports)) {
 304                         n = scnprintf(ptr, count, "%d\n", index + 1);
 305                         ptr += n;
 306                         count -= n;
 307                 }
 308         }
 309         return ptr - buf;
 310 }
 311
 312 /*
 313  * Sets the owner of a port
 314  */
 315 static void set_owner(struct ehci_hcd *ehci, int portnum, int new_owner)
 316 {
 317         u32 __iomem             *status_reg;
 318         u32                     port_status;
 319         int                     try;
 320
 321         status_reg = &ehci->regs->port_status[portnum];
 322
 323         /*
 324          * The controller won't set the OWNER bit if the port is
 325          * enabled, so this loop will sometimes require at least two
 326          * iterations: one to disable the port and one to set OWNER.
 327          */
 328         for (try = 4; try > 0; --try) {
 329                 spin_lock_irq(&ehci->lock);
 330                 port_status = ehci_readl(ehci, status_reg);
 331                 if ((port_status & PORT_OWNER) == new_owner
 332                                 || (port_status & (PORT_OWNER | PORT_CONNECT))
 333                                         == 0)
 334                         try = 0;
 335                 else {
 336                         port_status ^= PORT_OWNER;
 337                         port_status &= ~(PORT_PE | PORT_RWC_BITS);
 338                         ehci_writel(ehci, port_status, status_reg);
 339                 }
 340                 spin_unlock_irq(&ehci->lock);
 341                 if (try > 1)
 342                         msleep(5);
 343         }
 344 }
 345
 346 /*
 347  * Dedicate or undedicate a port to the companion controller.
 348  * Syntax is "[-]portnum", where a leading '-' sign means
 349  * return control of the port to the EHCI controller.
 350  */
 351 static ssize_t store_companion(struct device *dev,
 352                                struct device_attribute *attr,
 353                                const char *buf, size_t count)
 354 {
 355         struct ehci_hcd         *ehci;
 356         int                     portnum, new_owner;
 357
 358         ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
 359         new_owner = PORT_OWNER;         /* Owned by companion */
 360         if (sscanf(buf, "%d", &portnum) != 1)
 361                 return -EINVAL;
 362         if (portnum < 0) {
 363                 portnum = - portnum;
 364                 new_owner = 0;          /* Owned by EHCI */
 365         }
 366         if (portnum <= 0 || portnum > HCS_N_PORTS(ehci->hcs_params))
 367                 return -ENOENT;
 368         portnum--;
 369         if (new_owner)
 370                 set_bit(portnum, &ehci->companion_ports);
 371         else
 372                 clear_bit(portnum, &ehci->companion_ports);
 373         set_owner(ehci, portnum, new_owner);
 374         return count;
 375 }
 376 static DEVICE_ATTR(companion, 0644, show_companion, store_companion);
 377
 378 static inline void create_companion_file(struct ehci_hcd *ehci)
 379 {
 380         int     i;
 381
 382         /* with integrated TT there is no companion! */
 383         if (!ehci_is_TDI(ehci))
 384                 i = device_create_file(ehci_to_hcd(ehci)->self.dev,
 385                                        &dev_attr_companion);
 386 }
 387
 388 static inline void remove_companion_file(struct ehci_hcd *ehci)
 389 {
 390         /* with integrated TT there is no companion! */
 391         if (!ehci_is_TDI(ehci))
 392                 device_remove_file(ehci_to_hcd(ehci)->self.dev,
 393                                    &dev_attr_companion);
 394 }
 395
 396
 397 /*-------------------------------------------------------------------------*/
 398
 399 static int check_reset_complete (
 400         struct ehci_hcd *ehci,
 401         int             index,
 402         u32 __iomem     *status_reg,
 403         int             port_status
 404 ) {
 405         if (!(port_status & PORT_CONNECT))
 406                 return port_status;
 407
 408         /* if reset finished and it's still not enabled -- handoff */
 409         if (!(port_status & PORT_PE)) {
 410
 411                 /* with integrated TT, there's nobody to hand it to! */
 412                 if (ehci_is_TDI(ehci)) {
 413                         ehci_dbg (ehci,
 414                                 "Failed to enable port %d on root hub TT\n",
 415                                 index+1);
 416                         return port_status;
 417                 }
 418
 419                 ehci_dbg (ehci, "port %d full speed --> companion\n",
 420                         index + 1);
 421
 422                 // what happens if HCS_N_CC(params) == 0 ?
 423                 port_status |= PORT_OWNER;
 424                 port_status &= ~PORT_RWC_BITS;
 425                 ehci_writel(ehci, port_status, status_reg);
 426
 427         } else
 428                 ehci_dbg (ehci, "port %d high speed\n", index + 1);
 429
 430         return port_status;
 431 }
 432
 433 /*-------------------------------------------------------------------------*/
 434
 435
 436 /* build "status change" packet (one or two bytes) from HC registers */
 437
 438 static int
 439 ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
 440 {
 441         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 442         u32             temp, status = 0;
 443         u32             mask;
 444         int             ports, i, retval = 1;
 445         unsigned long   flags;
 446
 447         /* if !USB_SUSPEND, root hub timers won't get shut down ... */
 448         if (!HC_IS_RUNNING(hcd->state))
 449                 return 0;
 450
 451         /* init status to no-changes */
 452         buf [0] = 0;
 453         ports = HCS_N_PORTS (ehci->hcs_params);
 454         if (ports > 7) {
 455                 buf [1] = 0;
 456                 retval++;
 457         }
 458
 459         /* Some boards (mostly VIA?) report bogus overcurrent indications,
 460          * causing massive log spam unless we completely ignore them.  It
 461          * may be relevant that VIA VT8235 controllers, where PORT_POWER is
 462          * always set, seem to clear PORT_OCC and PORT_CSC when writing to
 463          * PORT_POWER; that's surprising, but maybe within-spec.
 464          */
 465         if (!ignore_oc)
 466                 mask = PORT_CSC | PORT_PEC | PORT_OCC;
 467         else
 468                 mask = PORT_CSC | PORT_PEC;
 469         // PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
 470
 471         /* no hub change reports (bit 0) for now (power, ...) */
 472
 473         /* port N changes (bit N)? */
 474         spin_lock_irqsave (&ehci->lock, flags);
 475         for (i = 0; i < ports; i++) {
 476                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 477
 478                 /*
 479                  * Return status information even for ports with OWNER set.
 480                  * Otherwise khubd wouldn't see the disconnect event when a
 481                  * high-speed device is switched over to the companion
 482                  * controller by the user.
 483                  */
 484
 485                 if ((temp & mask) != 0
 486                                 || ((temp & PORT_RESUME) != 0
 487                                         && time_after_eq(jiffies,
 488                                                 ehci->reset_done[i]))) {
 489                         if (i < 7)
 490                             buf [0] |= 1 << (i + 1);
 491                         else
 492                             buf [1] |= 1 << (i - 7);
 493                         status = STS_PCD;
 494                 }
 495         }
 496         /* FIXME autosuspend idle root hubs */
 497         spin_unlock_irqrestore (&ehci->lock, flags);
 498         return status ? retval : 0;
 499 }
 500
 501 /*-------------------------------------------------------------------------*/
 502
 503 static void
 504 ehci_hub_descriptor (
 505         struct ehci_hcd                 *ehci,
 506         struct usb_hub_descriptor       *desc
 507 ) {
 508         int             ports = HCS_N_PORTS (ehci->hcs_params);
 509         u16             temp;
 510
 511         desc->bDescriptorType = 0x29;
 512         desc->bPwrOn2PwrGood = 10;      /* ehci 1.0, 2.3.9 says 20ms max */
 513         desc->bHubContrCurrent = 0;
 514
 515         desc->bNbrPorts = ports;
 516         temp = 1 + (ports / 8);
 517         desc->bDescLength = 7 + 2 * temp;
 518
 519         /* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
 520         memset (&desc->bitmap [0], 0, temp);
 521         memset (&desc->bitmap [temp], 0xff, temp);
 522
 523         temp = 0x0008;                  /* per-port overcurrent reporting */
 524         if (HCS_PPC (ehci->hcs_params))
 525                 temp |= 0x0001;         /* per-port power control */
 526         else
 527                 temp |= 0x0002;         /* no power switching */
 528 #if 0
 529 // re-enable when we support USB_PORT_FEAT_INDICATOR below.
 530         if (HCS_INDICATOR (ehci->hcs_params))
 531                 temp |= 0x0080;         /* per-port indicators (LEDs) */
 532 #endif
 533         desc->wHubCharacteristics = cpu_to_le16(temp);
 534 }
 535
 536 /*-------------------------------------------------------------------------*/
 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                         clear_bit(wIndex, &ehci->port_c_suspend);
 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                                 set_bit(wIndex, &ehci->port_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                 if (test_bit(wIndex, &ehci->port_c_suspend))
 769                         status |= 1 << USB_PORT_FEAT_C_SUSPEND;
 770
 771 #ifndef VERBOSE_DEBUG
 772         if (status & ~0xffff)   /* only if wPortChange is interesting */
 773 #endif
 774                 dbg_port (ehci, "GetStatus", wIndex + 1, temp);
 775                 put_unaligned_le32(status, buf);
 776                 break;
 777         case SetHubFeature:
 778                 switch (wValue) {
 779                 case C_HUB_LOCAL_POWER:
 780                 case C_HUB_OVER_CURRENT:
 781                         /* no hub-wide feature/status flags */
 782                         break;
 783                 default:
 784                         goto error;
 785                 }
 786                 break;
 787         case SetPortFeature:
 788                 selector = wIndex >> 8;
 789                 wIndex &= 0xff;
 790                 if (!wIndex || wIndex > ports)
 791                         goto error;
 792                 wIndex--;
 793                 temp = ehci_readl(ehci, status_reg);
 794                 if (temp & PORT_OWNER)
 795                         break;
 796
 797                 temp &= ~PORT_RWC_BITS;
 798                 switch (wValue) {
 799                 case USB_PORT_FEAT_SUSPEND:
 800                         if (ehci->no_selective_suspend)
 801                                 break;
 802                         if ((temp & PORT_PE) == 0
 803                                         || (temp & PORT_RESET) != 0)
 804                                 goto error;
 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 }
 870
 871 static void ehci_relinquish_port(struct usb_hcd *hcd, int portnum)
 872 {
 873         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
 874
 875         if (ehci_is_TDI(ehci))
 876                 return;
 877         set_owner(ehci, --portnum, PORT_OWNER);
 878 }
 879
 880 static int ehci_port_handed_over(struct usb_hcd *hcd, int portnum)
 881 {
 882         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
 883         u32 __iomem             *reg;
 884
 885         if (ehci_is_TDI(ehci))
 886                 return 0;
 887         reg = &ehci->regs->port_status[portnum - 1];
 888         return ehci_readl(ehci, reg) & PORT_OWNER;
 889 }