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         u8                      resume_needed = 0;
 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         spin_unlock_irq(&ehci->lock);
 233         msleep(8);
 234         spin_lock_irq(&ehci->lock);
 235
 236         /* manually resume the ports we suspended during bus_suspend() */
 237         i = HCS_N_PORTS (ehci->hcs_params);
 238         while (i--) {
 239                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 240                 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
 241                 if (test_bit(i, &ehci->bus_suspended) &&
 242                                 (temp & PORT_SUSPEND)) {
 243                         temp |= PORT_RESUME;
 244                         resume_needed = 1;
 245                 }
 246                 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
 247         }
 248
 249         /* msleep for 20ms only if code is trying to resume port */
 250         if (resume_needed) {
 251                 spin_unlock_irq(&ehci->lock);
 252                 msleep(20);
 253                 spin_lock_irq(&ehci->lock);
 254         }
 255
 256         i = HCS_N_PORTS (ehci->hcs_params);
 257         while (i--) {
 258                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 259                 if (test_bit(i, &ehci->bus_suspended) &&
 260                                 (temp & PORT_SUSPEND)) {
 261                         temp &= ~(PORT_RWC_BITS | PORT_RESUME);
 262                         ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
 263                         ehci_vdbg (ehci, "resumed port %d\n", i + 1);
 264                 }
 265         }
 266         (void) ehci_readl(ehci, &ehci->regs->command);
 267
 268         /* maybe re-activate the schedule(s) */
 269         temp = 0;
 270         if (ehci->async->qh_next.qh)
 271                 temp |= CMD_ASE;
 272         if (ehci->periodic_sched)
 273                 temp |= CMD_PSE;
 274         if (temp) {
 275                 ehci->command |= temp;
 276                 ehci_writel(ehci, ehci->command, &ehci->regs->command);
 277         }
 278
 279         ehci->next_statechange = jiffies + msecs_to_jiffies(5);
 280         hcd->state = HC_STATE_RUNNING;
 281
 282         /* Now we can safely re-enable irqs */
 283         ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
 284
 285         spin_unlock_irq (&ehci->lock);
 286         ehci_handover_companion_ports(ehci);
 287         return 0;
 288 }
 289
 290 #else
 291
 292 #define ehci_bus_suspend        NULL
 293 #define ehci_bus_resume         NULL
 294
 295 #endif  /* CONFIG_PM */
 296
 297 /*-------------------------------------------------------------------------*/
 298
 299 /* Display the ports dedicated to the companion controller */
 300 static ssize_t show_companion(struct device *dev,
 301                               struct device_attribute *attr,
 302                               char *buf)
 303 {
 304         struct ehci_hcd         *ehci;
 305         int                     nports, index, n;
 306         int                     count = PAGE_SIZE;
 307         char                    *ptr = buf;
 308
 309         ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
 310         nports = HCS_N_PORTS(ehci->hcs_params);
 311
 312         for (index = 0; index < nports; ++index) {
 313                 if (test_bit(index, &ehci->companion_ports)) {
 314                         n = scnprintf(ptr, count, "%d\n", index + 1);
 315                         ptr += n;
 316                         count -= n;
 317                 }
 318         }
 319         return ptr - buf;
 320 }
 321
 322 /*
 323  * Sets the owner of a port
 324  */
 325 static void set_owner(struct ehci_hcd *ehci, int portnum, int new_owner)
 326 {
 327         u32 __iomem             *status_reg;
 328         u32                     port_status;
 329         int                     try;
 330
 331         status_reg = &ehci->regs->port_status[portnum];
 332
 333         /*
 334          * The controller won't set the OWNER bit if the port is
 335          * enabled, so this loop will sometimes require at least two
 336          * iterations: one to disable the port and one to set OWNER.
 337          */
 338         for (try = 4; try > 0; --try) {
 339                 spin_lock_irq(&ehci->lock);
 340                 port_status = ehci_readl(ehci, status_reg);
 341                 if ((port_status & PORT_OWNER) == new_owner
 342                                 || (port_status & (PORT_OWNER | PORT_CONNECT))
 343                                         == 0)
 344                         try = 0;
 345                 else {
 346                         port_status ^= PORT_OWNER;
 347                         port_status &= ~(PORT_PE | PORT_RWC_BITS);
 348                         ehci_writel(ehci, port_status, status_reg);
 349                 }
 350                 spin_unlock_irq(&ehci->lock);
 351                 if (try > 1)
 352                         msleep(5);
 353         }
 354 }
 355
 356 /*
 357  * Dedicate or undedicate a port to the companion controller.
 358  * Syntax is "[-]portnum", where a leading '-' sign means
 359  * return control of the port to the EHCI controller.
 360  */
 361 static ssize_t store_companion(struct device *dev,
 362                                struct device_attribute *attr,
 363                                const char *buf, size_t count)
 364 {
 365         struct ehci_hcd         *ehci;
 366         int                     portnum, new_owner;
 367
 368         ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
 369         new_owner = PORT_OWNER;         /* Owned by companion */
 370         if (sscanf(buf, "%d", &portnum) != 1)
 371                 return -EINVAL;
 372         if (portnum < 0) {
 373                 portnum = - portnum;
 374                 new_owner = 0;          /* Owned by EHCI */
 375         }
 376         if (portnum <= 0 || portnum > HCS_N_PORTS(ehci->hcs_params))
 377                 return -ENOENT;
 378         portnum--;
 379         if (new_owner)
 380                 set_bit(portnum, &ehci->companion_ports);
 381         else
 382                 clear_bit(portnum, &ehci->companion_ports);
 383         set_owner(ehci, portnum, new_owner);
 384         return count;
 385 }
 386 static DEVICE_ATTR(companion, 0644, show_companion, store_companion);
 387
 388 static inline void create_companion_file(struct ehci_hcd *ehci)
 389 {
 390         int     i;
 391
 392         /* with integrated TT there is no companion! */
 393         if (!ehci_is_TDI(ehci))
 394                 i = device_create_file(ehci_to_hcd(ehci)->self.controller,
 395                                        &dev_attr_companion);
 396 }
 397
 398 static inline void remove_companion_file(struct ehci_hcd *ehci)
 399 {
 400         /* with integrated TT there is no companion! */
 401         if (!ehci_is_TDI(ehci))
 402                 device_remove_file(ehci_to_hcd(ehci)->self.controller,
 403                                    &dev_attr_companion);
 404 }
 405
 406
 407 /*-------------------------------------------------------------------------*/
 408
 409 static int check_reset_complete (
 410         struct ehci_hcd *ehci,
 411         int             index,
 412         u32 __iomem     *status_reg,
 413         int             port_status
 414 ) {
 415         if (!(port_status & PORT_CONNECT))
 416                 return port_status;
 417
 418         /* if reset finished and it's still not enabled -- handoff */
 419         if (!(port_status & PORT_PE)) {
 420
 421                 /* with integrated TT, there's nobody to hand it to! */
 422                 if (ehci_is_TDI(ehci)) {
 423                         ehci_dbg (ehci,
 424                                 "Failed to enable port %d on root hub TT\n",
 425                                 index+1);
 426                         return port_status;
 427                 }
 428
 429                 ehci_dbg (ehci, "port %d full speed --> companion\n",
 430                         index + 1);
 431
 432                 // what happens if HCS_N_CC(params) == 0 ?
 433                 port_status |= PORT_OWNER;
 434                 port_status &= ~PORT_RWC_BITS;
 435                 ehci_writel(ehci, port_status, status_reg);
 436
 437                 /* ensure 440EPX ohci controller state is operational */
 438                 if (ehci->has_amcc_usb23)
 439                         set_ohci_hcfs(ehci, 1);
 440         } else {
 441                 ehci_dbg (ehci, "port %d high speed\n", index + 1);
 442                 /* ensure 440EPx ohci controller state is suspended */
 443                 if (ehci->has_amcc_usb23)
 444                         set_ohci_hcfs(ehci, 0);
 445         }
 446
 447         return port_status;
 448 }
 449
 450 /*-------------------------------------------------------------------------*/
 451
 452
 453 /* build "status change" packet (one or two bytes) from HC registers */
 454
 455 static int
 456 ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
 457 {
 458         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 459         u32             temp, status = 0;
 460         u32             mask;
 461         int             ports, i, retval = 1;
 462         unsigned long   flags;
 463
 464         /* if !USB_SUSPEND, root hub timers won't get shut down ... */
 465         if (!HC_IS_RUNNING(hcd->state))
 466                 return 0;
 467
 468         /* init status to no-changes */
 469         buf [0] = 0;
 470         ports = HCS_N_PORTS (ehci->hcs_params);
 471         if (ports > 7) {
 472                 buf [1] = 0;
 473                 retval++;
 474         }
 475
 476         /* Some boards (mostly VIA?) report bogus overcurrent indications,
 477          * causing massive log spam unless we completely ignore them.  It
 478          * may be relevant that VIA VT8235 controllers, where PORT_POWER is
 479          * always set, seem to clear PORT_OCC and PORT_CSC when writing to
 480          * PORT_POWER; that's surprising, but maybe within-spec.
 481          */
 482         if (!ignore_oc)
 483                 mask = PORT_CSC | PORT_PEC | PORT_OCC;
 484         else
 485                 mask = PORT_CSC | PORT_PEC;
 486         // PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
 487
 488         /* no hub change reports (bit 0) for now (power, ...) */
 489
 490         /* port N changes (bit N)? */
 491         spin_lock_irqsave (&ehci->lock, flags);
 492         for (i = 0; i < ports; i++) {
 493                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 494
 495                 /*
 496                  * Return status information even for ports with OWNER set.
 497                  * Otherwise khubd wouldn't see the disconnect event when a
 498                  * high-speed device is switched over to the companion
 499                  * controller by the user.
 500                  */
 501
 502                 if ((temp & mask) != 0 || test_bit(i, &ehci->port_c_suspend)
 503                                 || (ehci->reset_done[i] && time_after_eq(
 504                                         jiffies, ehci->reset_done[i]))) {
 505                         if (i < 7)
 506                             buf [0] |= 1 << (i + 1);
 507                         else
 508                             buf [1] |= 1 << (i - 7);
 509                         status = STS_PCD;
 510                 }
 511         }
 512         /* FIXME autosuspend idle root hubs */
 513         spin_unlock_irqrestore (&ehci->lock, flags);
 514         return status ? retval : 0;
 515 }
 516
 517 /*-------------------------------------------------------------------------*/
 518
 519 static void
 520 ehci_hub_descriptor (
 521         struct ehci_hcd                 *ehci,
 522         struct usb_hub_descriptor       *desc
 523 ) {
 524         int             ports = HCS_N_PORTS (ehci->hcs_params);
 525         u16             temp;
 526
 527         desc->bDescriptorType = 0x29;
 528         desc->bPwrOn2PwrGood = 10;      /* ehci 1.0, 2.3.9 says 20ms max */
 529         desc->bHubContrCurrent = 0;
 530
 531         desc->bNbrPorts = ports;
 532         temp = 1 + (ports / 8);
 533         desc->bDescLength = 7 + 2 * temp;
 534
 535         /* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
 536         memset (&desc->bitmap [0], 0, temp);
 537         memset (&desc->bitmap [temp], 0xff, temp);
 538
 539         temp = 0x0008;                  /* per-port overcurrent reporting */
 540         if (HCS_PPC (ehci->hcs_params))
 541                 temp |= 0x0001;         /* per-port power control */
 542         else
 543                 temp |= 0x0002;         /* no power switching */
 544 #if 0
 545 // re-enable when we support USB_PORT_FEAT_INDICATOR below.
 546         if (HCS_INDICATOR (ehci->hcs_params))
 547                 temp |= 0x0080;         /* per-port indicators (LEDs) */
 548 #endif
 549         desc->wHubCharacteristics = cpu_to_le16(temp);
 550 }
 551
 552 /*-------------------------------------------------------------------------*/
 553
 554 static int ehci_hub_control (
 555         struct usb_hcd  *hcd,
 556         u16             typeReq,
 557         u16             wValue,
 558         u16             wIndex,
 559         char            *buf,
 560         u16             wLength
 561 ) {
 562         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 563         int             ports = HCS_N_PORTS (ehci->hcs_params);
 564         u32 __iomem     *status_reg = &ehci->regs->port_status[
 565                                 (wIndex & 0xff) - 1];
 566         u32             temp, status;
 567         unsigned long   flags;
 568         int             retval = 0;
 569         unsigned        selector;
 570
 571         /*
 572          * FIXME:  support SetPortFeatures USB_PORT_FEAT_INDICATOR.
 573          * HCS_INDICATOR may say we can change LEDs to off/amber/green.
 574          * (track current state ourselves) ... blink for diagnostics,
 575          * power, "this is the one", etc.  EHCI spec supports this.
 576          */
 577
 578         spin_lock_irqsave (&ehci->lock, flags);
 579         switch (typeReq) {
 580         case ClearHubFeature:
 581                 switch (wValue) {
 582                 case C_HUB_LOCAL_POWER:
 583                 case C_HUB_OVER_CURRENT:
 584                         /* no hub-wide feature/status flags */
 585                         break;
 586                 default:
 587                         goto error;
 588                 }
 589                 break;
 590         case ClearPortFeature:
 591                 if (!wIndex || wIndex > ports)
 592                         goto error;
 593                 wIndex--;
 594                 temp = ehci_readl(ehci, status_reg);
 595
 596                 /*
 597                  * Even if OWNER is set, so the port is owned by the
 598                  * companion controller, khubd needs to be able to clear
 599                  * the port-change status bits (especially
 600                  * USB_PORT_FEAT_C_CONNECTION).
 601                  */
 602
 603                 switch (wValue) {
 604                 case USB_PORT_FEAT_ENABLE:
 605                         ehci_writel(ehci, temp & ~PORT_PE, status_reg);
 606                         break;
 607                 case USB_PORT_FEAT_C_ENABLE:
 608                         ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_PEC,
 609                                         status_reg);
 610                         break;
 611                 case USB_PORT_FEAT_SUSPEND:
 612                         if (temp & PORT_RESET)
 613                                 goto error;
 614                         if (ehci->no_selective_suspend)
 615                                 break;
 616                         if (temp & PORT_SUSPEND) {
 617                                 if ((temp & PORT_PE) == 0)
 618                                         goto error;
 619                                 /* resume signaling for 20 msec */
 620                                 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
 621                                 ehci_writel(ehci, temp | PORT_RESUME,
 622                                                 status_reg);
 623                                 ehci->reset_done [wIndex] = jiffies
 624                                                 + msecs_to_jiffies (20);
 625                         }
 626                         break;
 627                 case USB_PORT_FEAT_C_SUSPEND:
 628                         clear_bit(wIndex, &ehci->port_c_suspend);
 629                         break;
 630                 case USB_PORT_FEAT_POWER:
 631                         if (HCS_PPC (ehci->hcs_params))
 632                                 ehci_writel(ehci,
 633                                           temp & ~(PORT_RWC_BITS | PORT_POWER),
 634                                           status_reg);
 635                         break;
 636                 case USB_PORT_FEAT_C_CONNECTION:
 637                         ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_CSC,
 638                                         status_reg);
 639                         break;
 640                 case USB_PORT_FEAT_C_OVER_CURRENT:
 641                         ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_OCC,
 642                                         status_reg);
 643                         break;
 644                 case USB_PORT_FEAT_C_RESET:
 645                         /* GetPortStatus clears reset */
 646                         break;
 647                 default:
 648                         goto error;
 649                 }
 650                 ehci_readl(ehci, &ehci->regs->command); /* unblock posted write */
 651                 break;
 652         case GetHubDescriptor:
 653                 ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
 654                         buf);
 655                 break;
 656         case GetHubStatus:
 657                 /* no hub-wide feature/status flags */
 658                 memset (buf, 0, 4);
 659                 //cpu_to_le32s ((u32 *) buf);
 660                 break;
 661         case GetPortStatus:
 662                 if (!wIndex || wIndex > ports)
 663                         goto error;
 664                 wIndex--;
 665                 status = 0;
 666                 temp = ehci_readl(ehci, status_reg);
 667
 668                 // wPortChange bits
 669                 if (temp & PORT_CSC)
 670                         status |= 1 << USB_PORT_FEAT_C_CONNECTION;
 671                 if (temp & PORT_PEC)
 672                         status |= 1 << USB_PORT_FEAT_C_ENABLE;
 673
 674                 if ((temp & PORT_OCC) && !ignore_oc){
 675                         status |= 1 << USB_PORT_FEAT_C_OVER_CURRENT;
 676
 677                         /*
 678                          * Hubs should disable port power on over-current.
 679                          * However, not all EHCI implementations do this
 680                          * automatically, even if they _do_ support per-port
 681                          * power switching; they're allowed to just limit the
 682                          * current.  khubd will turn the power back on.
 683                          */
 684                         if (HCS_PPC (ehci->hcs_params)){
 685                                 ehci_writel(ehci,
 686                                         temp & ~(PORT_RWC_BITS | PORT_POWER),
 687                                         status_reg);
 688                         }
 689                 }
 690
 691                 /* whoever resumes must GetPortStatus to complete it!! */
 692                 if (temp & PORT_RESUME) {
 693
 694                         /* Remote Wakeup received? */
 695                         if (!ehci->reset_done[wIndex]) {
 696                                 /* resume signaling for 20 msec */
 697                                 ehci->reset_done[wIndex] = jiffies
 698                                                 + msecs_to_jiffies(20);
 699                                 /* check the port again */
 700                                 mod_timer(&ehci_to_hcd(ehci)->rh_timer,
 701                                                 ehci->reset_done[wIndex]);
 702                         }
 703
 704                         /* resume completed? */
 705                         else if (time_after_eq(jiffies,
 706                                         ehci->reset_done[wIndex])) {
 707                                 clear_bit(wIndex, &ehci->suspended_ports);
 708                                 set_bit(wIndex, &ehci->port_c_suspend);
 709                                 ehci->reset_done[wIndex] = 0;
 710
 711                                 /* stop resume signaling */
 712                                 temp = ehci_readl(ehci, status_reg);
 713                                 ehci_writel(ehci,
 714                                         temp & ~(PORT_RWC_BITS | PORT_RESUME),
 715                                         status_reg);
 716                                 retval = handshake(ehci, status_reg,
 717                                            PORT_RESUME, 0, 2000 /* 2msec */);
 718                                 if (retval != 0) {
 719                                         ehci_err(ehci,
 720                                                 "port %d resume error %d\n",
 721                                                 wIndex + 1, retval);
 722                                         goto error;
 723                                 }
 724                                 temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10));
 725                         }
 726                 }
 727
 728                 /* whoever resets must GetPortStatus to complete it!! */
 729                 if ((temp & PORT_RESET)
 730                                 && time_after_eq(jiffies,
 731                                         ehci->reset_done[wIndex])) {
 732                         status |= 1 << USB_PORT_FEAT_C_RESET;
 733                         ehci->reset_done [wIndex] = 0;
 734
 735                         /* force reset to complete */
 736                         ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESET),
 737                                         status_reg);
 738                         /* REVISIT:  some hardware needs 550+ usec to clear
 739                          * this bit; seems too long to spin routinely...
 740                          */
 741                         retval = handshake(ehci, status_reg,
 742                                         PORT_RESET, 0, 750);
 743                         if (retval != 0) {
 744                                 ehci_err (ehci, "port %d reset error %d\n",
 745                                         wIndex + 1, retval);
 746                                 goto error;
 747                         }
 748
 749                         /* see what we found out */
 750                         temp = check_reset_complete (ehci, wIndex, status_reg,
 751                                         ehci_readl(ehci, status_reg));
 752                 }
 753
 754                 if (!(temp & (PORT_RESUME|PORT_RESET)))
 755                         ehci->reset_done[wIndex] = 0;
 756
 757                 /* transfer dedicated ports to the companion hc */
 758                 if ((temp & PORT_CONNECT) &&
 759                                 test_bit(wIndex, &ehci->companion_ports)) {
 760                         temp &= ~PORT_RWC_BITS;
 761                         temp |= PORT_OWNER;
 762                         ehci_writel(ehci, temp, status_reg);
 763                         ehci_dbg(ehci, "port %d --> companion\n", wIndex + 1);
 764                         temp = ehci_readl(ehci, status_reg);
 765                 }
 766
 767                 /*
 768                  * Even if OWNER is set, there's no harm letting khubd
 769                  * see the wPortStatus values (they should all be 0 except
 770                  * for PORT_POWER anyway).
 771                  */
 772
 773                 if (temp & PORT_CONNECT) {
 774                         status |= 1 << USB_PORT_FEAT_CONNECTION;
 775                         // status may be from integrated TT
 776                         status |= ehci_port_speed(ehci, temp);
 777                 }
 778                 if (temp & PORT_PE)
 779                         status |= 1 << USB_PORT_FEAT_ENABLE;
 780
 781                 /* maybe the port was unsuspended without our knowledge */
 782                 if (temp & (PORT_SUSPEND|PORT_RESUME)) {
 783                         status |= 1 << USB_PORT_FEAT_SUSPEND;
 784                 } else if (test_bit(wIndex, &ehci->suspended_ports)) {
 785                         clear_bit(wIndex, &ehci->suspended_ports);
 786                         ehci->reset_done[wIndex] = 0;
 787                         if (temp & PORT_PE)
 788                                 set_bit(wIndex, &ehci->port_c_suspend);
 789                 }
 790
 791                 if (temp & PORT_OC)
 792                         status |= 1 << USB_PORT_FEAT_OVER_CURRENT;
 793                 if (temp & PORT_RESET)
 794                         status |= 1 << USB_PORT_FEAT_RESET;
 795                 if (temp & PORT_POWER)
 796                         status |= 1 << USB_PORT_FEAT_POWER;
 797                 if (test_bit(wIndex, &ehci->port_c_suspend))
 798                         status |= 1 << USB_PORT_FEAT_C_SUSPEND;
 799
 800 #ifndef VERBOSE_DEBUG
 801         if (status & ~0xffff)   /* only if wPortChange is interesting */
 802 #endif
 803                 dbg_port (ehci, "GetStatus", wIndex + 1, temp);
 804                 put_unaligned_le32(status, buf);
 805                 break;
 806         case SetHubFeature:
 807                 switch (wValue) {
 808                 case C_HUB_LOCAL_POWER:
 809                 case C_HUB_OVER_CURRENT:
 810                         /* no hub-wide feature/status flags */
 811                         break;
 812                 default:
 813                         goto error;
 814                 }
 815                 break;
 816         case SetPortFeature:
 817                 selector = wIndex >> 8;
 818                 wIndex &= 0xff;
 819                 if (!wIndex || wIndex > ports)
 820                         goto error;
 821                 wIndex--;
 822                 temp = ehci_readl(ehci, status_reg);
 823                 if (temp & PORT_OWNER)
 824                         break;
 825
 826                 temp &= ~PORT_RWC_BITS;
 827                 switch (wValue) {
 828                 case USB_PORT_FEAT_SUSPEND:
 829                         if (ehci->no_selective_suspend)
 830                                 break;
 831                         if ((temp & PORT_PE) == 0
 832                                         || (temp & PORT_RESET) != 0)
 833                                 goto error;
 834                         ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
 835                         set_bit(wIndex, &ehci->suspended_ports);
 836                         break;
 837                 case USB_PORT_FEAT_POWER:
 838                         if (HCS_PPC (ehci->hcs_params))
 839                                 ehci_writel(ehci, temp | PORT_POWER,
 840                                                 status_reg);
 841                         break;
 842                 case USB_PORT_FEAT_RESET:
 843                         if (temp & PORT_RESUME)
 844                                 goto error;
 845                         /* line status bits may report this as low speed,
 846                          * which can be fine if this root hub has a
 847                          * transaction translator built in.
 848                          */
 849                         if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
 850                                         && !ehci_is_TDI(ehci)
 851                                         && PORT_USB11 (temp)) {
 852                                 ehci_dbg (ehci,
 853                                         "port %d low speed --> companion\n",
 854                                         wIndex + 1);
 855                                 temp |= PORT_OWNER;
 856                         } else {
 857                                 ehci_vdbg (ehci, "port %d reset\n", wIndex + 1);
 858                                 temp |= PORT_RESET;
 859                                 temp &= ~PORT_PE;
 860
 861                                 /*
 862                                  * caller must wait, then call GetPortStatus
 863                                  * usb 2.0 spec says 50 ms resets on root
 864                                  */
 865                                 ehci->reset_done [wIndex] = jiffies
 866                                                 + msecs_to_jiffies (50);
 867                         }
 868                         ehci_writel(ehci, temp, status_reg);
 869                         break;
 870
 871                 /* For downstream facing ports (these):  one hub port is put
 872                  * into test mode according to USB2 11.24.2.13, then the hub
 873                  * must be reset (which for root hub now means rmmod+modprobe,
 874                  * or else system reboot).  See EHCI 2.3.9 and 4.14 for info
 875                  * about the EHCI-specific stuff.
 876                  */
 877                 case USB_PORT_FEAT_TEST:
 878                         if (!selector || selector > 5)
 879                                 goto error;
 880                         ehci_quiesce(ehci);
 881                         ehci_halt(ehci);
 882                         temp |= selector << 16;
 883                         ehci_writel(ehci, temp, status_reg);
 884                         break;
 885
 886                 default:
 887                         goto error;
 888                 }
 889                 ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
 890                 break;
 891
 892         default:
 893 error:
 894                 /* "stall" on error */
 895                 retval = -EPIPE;
 896         }
 897         spin_unlock_irqrestore (&ehci->lock, flags);
 898         return retval;
 899 }
 900
 901 static void ehci_relinquish_port(struct usb_hcd *hcd, int portnum)
 902 {
 903         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
 904
 905         if (ehci_is_TDI(ehci))
 906                 return;
 907         set_owner(ehci, --portnum, PORT_OWNER);
 908 }
 909
 910 static int ehci_port_handed_over(struct usb_hcd *hcd, int portnum)
 911 {
 912         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
 913         u32 __iomem             *reg;
 914
 915         if (ehci_is_TDI(ehci))
 916                 return 0;
 917         reg = &ehci->regs->port_status[portnum - 1];
 918         return ehci_readl(ehci, reg) & PORT_OWNER;
 919 }