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   1 /*
   2  * Copyright (C) 2001-2004 by David Brownell
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License as published by the
   6  * Free Software Foundation; either version 2 of the License, or (at your
   7  * option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  11  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software Foundation,
  16  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17  */
  18
  19 /* this file is part of ehci-hcd.c */
  20
  21 /*-------------------------------------------------------------------------*/
  22
  23 /*
  24  * EHCI Root Hub ... the nonsharable stuff
  25  *
  26  * Registers don't need cpu_to_le32, that happens transparently
  27  */
  28
  29 /*-------------------------------------------------------------------------*/
  30
  31 #ifdef  CONFIG_USB_PERSIST
  32
  33 static int ehci_hub_control(
  34         struct usb_hcd  *hcd,
  35         u16             typeReq,
  36         u16             wValue,
  37         u16             wIndex,
  38         char            *buf,
  39         u16             wLength
  40 );
  41
  42 /* After a power loss, ports that were owned by the companion must be
  43  * reset so that the companion can still own them.
  44  */
  45 static void ehci_handover_companion_ports(struct ehci_hcd *ehci)
  46 {
  47         u32 __iomem     *reg;
  48         u32             status;
  49         int             port;
  50         __le32          buf;
  51         struct usb_hcd  *hcd = ehci_to_hcd(ehci);
  52
  53         if (!ehci->owned_ports)
  54                 return;
  55
  56         /* Give the connections some time to appear */
  57         msleep(20);
  58
  59         port = HCS_N_PORTS(ehci->hcs_params);
  60         while (port--) {
  61                 if (test_bit(port, &ehci->owned_ports)) {
  62                         reg = &ehci->regs->port_status[port];
  63                         status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
  64
  65                         /* Port already owned by companion? */
  66                         if (status & PORT_OWNER)
  67                                 clear_bit(port, &ehci->owned_ports);
  68                         else if (test_bit(port, &ehci->companion_ports))
  69                                 ehci_writel(ehci, status & ~PORT_PE, reg);
  70                         else
  71                                 ehci_hub_control(hcd, SetPortFeature,
  72                                                 USB_PORT_FEAT_RESET, port + 1,
  73                                                 NULL, 0);
  74                 }
  75         }
  76
  77         if (!ehci->owned_ports)
  78                 return;
  79         msleep(90);             /* Wait for resets to complete */
  80
  81         port = HCS_N_PORTS(ehci->hcs_params);
  82         while (port--) {
  83                 if (test_bit(port, &ehci->owned_ports)) {
  84                         ehci_hub_control(hcd, GetPortStatus,
  85                                         0, port + 1,
  86                                         (char *) &buf, sizeof(buf));
  87
  88                         /* The companion should now own the port,
  89                          * but if something went wrong the port must not
  90                          * remain enabled.
  91                          */
  92                         reg = &ehci->regs->port_status[port];
  93                         status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
  94                         if (status & PORT_OWNER)
  95                                 ehci_writel(ehci, status | PORT_CSC, reg);
  96                         else {
  97                                 ehci_dbg(ehci, "failed handover port %d: %x\n",
  98                                                 port + 1, status);
  99                                 ehci_writel(ehci, status & ~PORT_PE, reg);
 100                         }
 101                 }
 102         }
 103
 104         ehci->owned_ports = 0;
 105 }
 106
 107 #else   /* CONFIG_USB_PERSIST */
 108
 109 static inline void ehci_handover_companion_ports(struct ehci_hcd *ehci)
 110 { }
 111
 112 #endif
 113
 114 #ifdef  CONFIG_PM
 115
 116 static int ehci_bus_suspend (struct usb_hcd *hcd)
 117 {
 118         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 119         int                     port;
 120         int                     mask;
 121
 122         ehci_dbg(ehci, "suspend root hub\n");
 123
 124         if (time_before (jiffies, ehci->next_statechange))
 125                 msleep(5);
 126
 127         port = HCS_N_PORTS (ehci->hcs_params);
 128         spin_lock_irq (&ehci->lock);
 129
 130         /* stop schedules, clean any completed work */
 131         if (HC_IS_RUNNING(hcd->state)) {
 132                 ehci_quiesce (ehci);
 133                 hcd->state = HC_STATE_QUIESCING;
 134         }
 135         ehci->command = ehci_readl(ehci, &ehci->regs->command);
 136         if (ehci->reclaim)
 137                 ehci->reclaim_ready = 1;
 138         ehci_work(ehci);
 139
 140         /* Unlike other USB host controller types, EHCI doesn't have
 141          * any notion of "global" or bus-wide suspend.  The driver has
 142          * to manually suspend all the active unsuspended ports, and
 143          * then manually resume them in the bus_resume() routine.
 144          */
 145         ehci->bus_suspended = 0;
 146         ehci->owned_ports = 0;
 147         while (port--) {
 148                 u32 __iomem     *reg = &ehci->regs->port_status [port];
 149                 u32             t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
 150                 u32             t2 = t1;
 151
 152                 /* keep track of which ports we suspend */
 153                 if (t1 & PORT_OWNER)
 154                         set_bit(port, &ehci->owned_ports);
 155                 else if ((t1 & PORT_PE) && !(t1 & PORT_SUSPEND)) {
 156                         t2 |= PORT_SUSPEND;
 157                         set_bit(port, &ehci->bus_suspended);
 158                 }
 159
 160                 /* enable remote wakeup on all ports */
 161                 if (device_may_wakeup(&hcd->self.root_hub->dev))
 162                         t2 |= PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E;
 163                 else
 164                         t2 &= ~(PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E);
 165
 166                 if (t1 != t2) {
 167                         ehci_vdbg (ehci, "port %d, %08x -> %08x\n",
 168                                 port + 1, t1, t2);
 169                         ehci_writel(ehci, t2, reg);
 170                 }
 171         }
 172
 173         /* turn off now-idle HC */
 174         del_timer_sync (&ehci->watchdog);
 175         ehci_halt (ehci);
 176         hcd->state = HC_STATE_SUSPENDED;
 177
 178         /* allow remote wakeup */
 179         mask = INTR_MASK;
 180         if (!device_may_wakeup(&hcd->self.root_hub->dev))
 181                 mask &= ~STS_PCD;
 182         ehci_writel(ehci, mask, &ehci->regs->intr_enable);
 183         ehci_readl(ehci, &ehci->regs->intr_enable);
 184
 185         ehci->next_statechange = jiffies + msecs_to_jiffies(10);
 186         spin_unlock_irq (&ehci->lock);
 187         return 0;
 188 }
 189
 190
 191 /* caller has locked the root hub, and should reset/reinit on error */
 192 static int ehci_bus_resume (struct usb_hcd *hcd)
 193 {
 194         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 195         u32                     temp;
 196         u32                     power_okay;
 197         int                     i;
 198
 199         if (time_before (jiffies, ehci->next_statechange))
 200                 msleep(5);
 201         spin_lock_irq (&ehci->lock);
 202
 203         /* Ideally and we've got a real resume here, and no port's power
 204          * was lost.  (For PCI, that means Vaux was maintained.)  But we
 205          * could instead be restoring a swsusp snapshot -- so that BIOS was
 206          * the last user of the controller, not reset/pm hardware keeping
 207          * state we gave to it.
 208          */
 209         power_okay = ehci_readl(ehci, &ehci->regs->intr_enable);
 210         ehci_dbg(ehci, "resume root hub%s\n",
 211                         power_okay ? "" : " after power loss");
 212
 213         /* at least some APM implementations will try to deliver
 214          * IRQs right away, so delay them until we're ready.
 215          */
 216         ehci_writel(ehci, 0, &ehci->regs->intr_enable);
 217
 218         /* re-init operational registers */
 219         ehci_writel(ehci, 0, &ehci->regs->segment);
 220         ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
 221         ehci_writel(ehci, (u32) ehci->async->qh_dma, &ehci->regs->async_next);
 222
 223         /* restore CMD_RUN, framelist size, and irq threshold */
 224         ehci_writel(ehci, ehci->command, &ehci->regs->command);
 225
 226         /* Some controller/firmware combinations need a delay during which
 227          * they set up the port statuses.  See Bugzilla #8190. */
 228         mdelay(8);
 229
 230         /* manually resume the ports we suspended during bus_suspend() */
 231         i = HCS_N_PORTS (ehci->hcs_params);
 232         while (i--) {
 233                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 234                 temp &= ~(PORT_RWC_BITS
 235                         | PORT_WKOC_E | PORT_WKDISC_E | PORT_WKCONN_E);
 236                 if (test_bit(i, &ehci->bus_suspended) &&
 237                                 (temp & PORT_SUSPEND)) {
 238                         ehci->reset_done [i] = jiffies + msecs_to_jiffies (20);
 239                         temp |= PORT_RESUME;
 240                 }
 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
 275         if (!power_okay)
 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 class_device *class_dev, 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(class_get_devdata(class_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  * Dedicate or undedicate a port to the companion controller.
 312  * Syntax is "[-]portnum", where a leading '-' sign means
 313  * return control of the port to the EHCI controller.
 314  */
 315 static ssize_t store_companion(struct class_device *class_dev,
 316                 const char *buf, size_t count)
 317 {
 318         struct ehci_hcd         *ehci;
 319         int                     portnum, new_owner, try;
 320         u32 __iomem             *status_reg;
 321         u32                     port_status;
 322
 323         ehci = hcd_to_ehci(bus_to_hcd(class_get_devdata(class_dev)));
 324         new_owner = PORT_OWNER;         /* Owned by companion */
 325         if (sscanf(buf, "%d", &portnum) != 1)
 326                 return -EINVAL;
 327         if (portnum < 0) {
 328                 portnum = - portnum;
 329                 new_owner = 0;          /* Owned by EHCI */
 330         }
 331         if (portnum <= 0 || portnum > HCS_N_PORTS(ehci->hcs_params))
 332                 return -ENOENT;
 333         status_reg = &ehci->regs->port_status[--portnum];
 334         if (new_owner)
 335                 set_bit(portnum, &ehci->companion_ports);
 336         else
 337                 clear_bit(portnum, &ehci->companion_ports);
 338
 339         /*
 340          * The controller won't set the OWNER bit if the port is
 341          * enabled, so this loop will sometimes require at least two
 342          * iterations: one to disable the port and one to set OWNER.
 343          */
 344
 345         for (try = 4; try > 0; --try) {
 346                 spin_lock_irq(&ehci->lock);
 347                 port_status = ehci_readl(ehci, status_reg);
 348                 if ((port_status & PORT_OWNER) == new_owner
 349                                 || (port_status & (PORT_OWNER | PORT_CONNECT))
 350                                         == 0)
 351                         try = 0;
 352                 else {
 353                         port_status ^= PORT_OWNER;
 354                         port_status &= ~(PORT_PE | PORT_RWC_BITS);
 355                         ehci_writel(ehci, port_status, status_reg);
 356                 }
 357                 spin_unlock_irq(&ehci->lock);
 358                 if (try > 1)
 359                         msleep(5);
 360         }
 361         return count;
 362 }
 363 static CLASS_DEVICE_ATTR(companion, 0644, show_companion, store_companion);
 364
 365 static inline void create_companion_file(struct ehci_hcd *ehci)
 366 {
 367         int     i;
 368
 369         /* with integrated TT there is no companion! */
 370         if (!ehci_is_TDI(ehci))
 371                 i = class_device_create_file(ehci_to_hcd(ehci)->self.class_dev,
 372                                 &class_device_attr_companion);
 373 }
 374
 375 static inline void remove_companion_file(struct ehci_hcd *ehci)
 376 {
 377         /* with integrated TT there is no companion! */
 378         if (!ehci_is_TDI(ehci))
 379                 class_device_remove_file(ehci_to_hcd(ehci)->self.class_dev,
 380                                 &class_device_attr_companion);
 381 }
 382
 383
 384 /*-------------------------------------------------------------------------*/
 385
 386 static int check_reset_complete (
 387         struct ehci_hcd *ehci,
 388         int             index,
 389         u32 __iomem     *status_reg,
 390         int             port_status
 391 ) {
 392         if (!(port_status & PORT_CONNECT)) {
 393                 ehci->reset_done [index] = 0;
 394                 return port_status;
 395         }
 396
 397         /* if reset finished and it's still not enabled -- handoff */
 398         if (!(port_status & PORT_PE)) {
 399
 400                 /* with integrated TT, there's nobody to hand it to! */
 401                 if (ehci_is_TDI(ehci)) {
 402                         ehci_dbg (ehci,
 403                                 "Failed to enable port %d on root hub TT\n",
 404                                 index+1);
 405                         return port_status;
 406                 }
 407
 408                 ehci_dbg (ehci, "port %d full speed --> companion\n",
 409                         index + 1);
 410
 411                 // what happens if HCS_N_CC(params) == 0 ?
 412                 port_status |= PORT_OWNER;
 413                 port_status &= ~PORT_RWC_BITS;
 414                 ehci_writel(ehci, port_status, status_reg);
 415
 416         } else
 417                 ehci_dbg (ehci, "port %d high speed\n", index + 1);
 418
 419         return port_status;
 420 }
 421
 422 /*-------------------------------------------------------------------------*/
 423
 424
 425 /* build "status change" packet (one or two bytes) from HC registers */
 426
 427 static int
 428 ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
 429 {
 430         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 431         u32             temp, status = 0;
 432         u32             mask;
 433         int             ports, i, retval = 1;
 434         unsigned long   flags;
 435
 436         /* if !USB_SUSPEND, root hub timers won't get shut down ... */
 437         if (!HC_IS_RUNNING(hcd->state))
 438                 return 0;
 439
 440         /* init status to no-changes */
 441         buf [0] = 0;
 442         ports = HCS_N_PORTS (ehci->hcs_params);
 443         if (ports > 7) {
 444                 buf [1] = 0;
 445                 retval++;
 446         }
 447
 448         /* Some boards (mostly VIA?) report bogus overcurrent indications,
 449          * causing massive log spam unless we completely ignore them.  It
 450          * may be relevant that VIA VT8235 controlers, where PORT_POWER is
 451          * always set, seem to clear PORT_OCC and PORT_CSC when writing to
 452          * PORT_POWER; that's surprising, but maybe within-spec.
 453          */
 454         if (!ignore_oc)
 455                 mask = PORT_CSC | PORT_PEC | PORT_OCC;
 456         else
 457                 mask = PORT_CSC | PORT_PEC;
 458         // PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
 459
 460         /* no hub change reports (bit 0) for now (power, ...) */
 461
 462         /* port N changes (bit N)? */
 463         spin_lock_irqsave (&ehci->lock, flags);
 464         for (i = 0; i < ports; i++) {
 465                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 466
 467                 /*
 468                  * Return status information even for ports with OWNER set.
 469                  * Otherwise khubd wouldn't see the disconnect event when a
 470                  * high-speed device is switched over to the companion
 471                  * controller by the user.
 472                  */
 473
 474                 if (!(temp & PORT_CONNECT))
 475                         ehci->reset_done [i] = 0;
 476                 if ((temp & mask) != 0
 477                                 || ((temp & PORT_RESUME) != 0
 478                                         && time_after_eq(jiffies,
 479                                                 ehci->reset_done[i]))) {
 480                         if (i < 7)
 481                             buf [0] |= 1 << (i + 1);
 482                         else
 483                             buf [1] |= 1 << (i - 7);
 484                         status = STS_PCD;
 485                 }
 486         }
 487         /* FIXME autosuspend idle root hubs */
 488         spin_unlock_irqrestore (&ehci->lock, flags);
 489         return status ? retval : 0;
 490 }
 491
 492 /*-------------------------------------------------------------------------*/
 493
 494 static void
 495 ehci_hub_descriptor (
 496         struct ehci_hcd                 *ehci,
 497         struct usb_hub_descriptor       *desc
 498 ) {
 499         int             ports = HCS_N_PORTS (ehci->hcs_params);
 500         u16             temp;
 501
 502         desc->bDescriptorType = 0x29;
 503         desc->bPwrOn2PwrGood = 10;      /* ehci 1.0, 2.3.9 says 20ms max */
 504         desc->bHubContrCurrent = 0;
 505
 506         desc->bNbrPorts = ports;
 507         temp = 1 + (ports / 8);
 508         desc->bDescLength = 7 + 2 * temp;
 509
 510         /* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
 511         memset (&desc->bitmap [0], 0, temp);
 512         memset (&desc->bitmap [temp], 0xff, temp);
 513
 514         temp = 0x0008;                  /* per-port overcurrent reporting */
 515         if (HCS_PPC (ehci->hcs_params))
 516                 temp |= 0x0001;         /* per-port power control */
 517         else
 518                 temp |= 0x0002;         /* no power switching */
 519 #if 0
 520 // re-enable when we support USB_PORT_FEAT_INDICATOR below.
 521         if (HCS_INDICATOR (ehci->hcs_params))
 522                 temp |= 0x0080;         /* per-port indicators (LEDs) */
 523 #endif
 524         desc->wHubCharacteristics = (__force __u16)cpu_to_le16 (temp);
 525 }
 526
 527 /*-------------------------------------------------------------------------*/
 528
 529 #define PORT_WAKE_BITS  (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
 530
 531 static int ehci_hub_control (
 532         struct usb_hcd  *hcd,
 533         u16             typeReq,
 534         u16             wValue,
 535         u16             wIndex,
 536         char            *buf,
 537         u16             wLength
 538 ) {
 539         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 540         int             ports = HCS_N_PORTS (ehci->hcs_params);
 541         u32 __iomem     *status_reg = &ehci->regs->port_status[
 542                                 (wIndex & 0xff) - 1];
 543         u32             temp, status;
 544         unsigned long   flags;
 545         int             retval = 0;
 546         unsigned        selector;
 547
 548         /*
 549          * FIXME:  support SetPortFeatures USB_PORT_FEAT_INDICATOR.
 550          * HCS_INDICATOR may say we can change LEDs to off/amber/green.
 551          * (track current state ourselves) ... blink for diagnostics,
 552          * power, "this is the one", etc.  EHCI spec supports this.
 553          */
 554
 555         spin_lock_irqsave (&ehci->lock, flags);
 556         switch (typeReq) {
 557         case ClearHubFeature:
 558                 switch (wValue) {
 559                 case C_HUB_LOCAL_POWER:
 560                 case C_HUB_OVER_CURRENT:
 561                         /* no hub-wide feature/status flags */
 562                         break;
 563                 default:
 564                         goto error;
 565                 }
 566                 break;
 567         case ClearPortFeature:
 568                 if (!wIndex || wIndex > ports)
 569                         goto error;
 570                 wIndex--;
 571                 temp = ehci_readl(ehci, status_reg);
 572
 573                 /*
 574                  * Even if OWNER is set, so the port is owned by the
 575                  * companion controller, khubd needs to be able to clear
 576                  * the port-change status bits (especially
 577                  * USB_PORT_FEAT_C_CONNECTION).
 578                  */
 579
 580                 switch (wValue) {
 581                 case USB_PORT_FEAT_ENABLE:
 582                         ehci_writel(ehci, temp & ~PORT_PE, status_reg);
 583                         break;
 584                 case USB_PORT_FEAT_C_ENABLE:
 585                         ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_PEC,
 586                                         status_reg);
 587                         break;
 588                 case USB_PORT_FEAT_SUSPEND:
 589                         if (temp & PORT_RESET)
 590                                 goto error;
 591                         if (ehci->no_selective_suspend)
 592                                 break;
 593                         if (temp & PORT_SUSPEND) {
 594                                 if ((temp & PORT_PE) == 0)
 595                                         goto error;
 596                                 /* resume signaling for 20 msec */
 597                                 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
 598                                 ehci_writel(ehci, temp | PORT_RESUME,
 599                                                 status_reg);
 600                                 ehci->reset_done [wIndex] = jiffies
 601                                                 + msecs_to_jiffies (20);
 602                         }
 603                         break;
 604                 case USB_PORT_FEAT_C_SUSPEND:
 605                         /* we auto-clear this feature */
 606                         break;
 607                 case USB_PORT_FEAT_POWER:
 608                         if (HCS_PPC (ehci->hcs_params))
 609                                 ehci_writel(ehci,
 610                                           temp & ~(PORT_RWC_BITS | PORT_POWER),
 611                                           status_reg);
 612                         break;
 613                 case USB_PORT_FEAT_C_CONNECTION:
 614                         ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_CSC,
 615                                         status_reg);
 616                         break;
 617                 case USB_PORT_FEAT_C_OVER_CURRENT:
 618                         ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_OCC,
 619                                         status_reg);
 620                         break;
 621                 case USB_PORT_FEAT_C_RESET:
 622                         /* GetPortStatus clears reset */
 623                         break;
 624                 default:
 625                         goto error;
 626                 }
 627                 ehci_readl(ehci, &ehci->regs->command); /* unblock posted write */
 628                 break;
 629         case GetHubDescriptor:
 630                 ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
 631                         buf);
 632                 break;
 633         case GetHubStatus:
 634                 /* no hub-wide feature/status flags */
 635                 memset (buf, 0, 4);
 636                 //cpu_to_le32s ((u32 *) buf);
 637                 break;
 638         case GetPortStatus:
 639                 if (!wIndex || wIndex > ports)
 640                         goto error;
 641                 wIndex--;
 642                 status = 0;
 643                 temp = ehci_readl(ehci, status_reg);
 644
 645                 // wPortChange bits
 646                 if (temp & PORT_CSC)
 647                         status |= 1 << USB_PORT_FEAT_C_CONNECTION;
 648                 if (temp & PORT_PEC)
 649                         status |= 1 << USB_PORT_FEAT_C_ENABLE;
 650
 651                 if ((temp & PORT_OCC) && !ignore_oc){
 652                         status |= 1 << USB_PORT_FEAT_C_OVER_CURRENT;
 653
 654                         /*
 655                          * Hubs should disable port power on over-current.
 656                          * However, not all EHCI implementations do this
 657                          * automatically, even if they _do_ support per-port
 658                          * power switching; they're allowed to just limit the
 659                          * current.  khubd will turn the power back on.
 660                          */
 661                         if (HCS_PPC (ehci->hcs_params)){
 662                                 ehci_writel(ehci,
 663                                         temp & ~(PORT_RWC_BITS | PORT_POWER),
 664                                         status_reg);
 665                         }
 666                 }
 667
 668                 /* whoever resumes must GetPortStatus to complete it!! */
 669                 if (temp & PORT_RESUME) {
 670
 671                         /* Remote Wakeup received? */
 672                         if (!ehci->reset_done[wIndex]) {
 673                                 /* resume signaling for 20 msec */
 674                                 ehci->reset_done[wIndex] = jiffies
 675                                                 + msecs_to_jiffies(20);
 676                                 /* check the port again */
 677                                 mod_timer(&ehci_to_hcd(ehci)->rh_timer,
 678                                                 ehci->reset_done[wIndex]);
 679                         }
 680
 681                         /* resume completed? */
 682                         else if (time_after_eq(jiffies,
 683                                         ehci->reset_done[wIndex])) {
 684                                 status |= 1 << USB_PORT_FEAT_C_SUSPEND;
 685                                 ehci->reset_done[wIndex] = 0;
 686
 687                                 /* stop resume signaling */
 688                                 temp = ehci_readl(ehci, status_reg);
 689                                 ehci_writel(ehci,
 690                                         temp & ~(PORT_RWC_BITS | PORT_RESUME),
 691                                         status_reg);
 692                                 retval = handshake(ehci, status_reg,
 693                                            PORT_RESUME, 0, 2000 /* 2msec */);
 694                                 if (retval != 0) {
 695                                         ehci_err(ehci,
 696                                                 "port %d resume error %d\n",
 697                                                 wIndex + 1, retval);
 698                                         goto error;
 699                                 }
 700                                 temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10));
 701                         }
 702                 }
 703
 704                 /* whoever resets must GetPortStatus to complete it!! */
 705                 if ((temp & PORT_RESET)
 706                                 && time_after_eq(jiffies,
 707                                         ehci->reset_done[wIndex])) {
 708                         status |= 1 << USB_PORT_FEAT_C_RESET;
 709                         ehci->reset_done [wIndex] = 0;
 710
 711                         /* force reset to complete */
 712                         ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESET),
 713                                         status_reg);
 714                         /* REVISIT:  some hardware needs 550+ usec to clear
 715                          * this bit; seems too long to spin routinely...
 716                          */
 717                         retval = handshake(ehci, status_reg,
 718                                         PORT_RESET, 0, 750);
 719                         if (retval != 0) {
 720                                 ehci_err (ehci, "port %d reset error %d\n",
 721                                         wIndex + 1, retval);
 722                                 goto error;
 723                         }
 724
 725                         /* see what we found out */
 726                         temp = check_reset_complete (ehci, wIndex, status_reg,
 727                                         ehci_readl(ehci, status_reg));
 728                 }
 729
 730                 /* transfer dedicated ports to the companion hc */
 731                 if ((temp & PORT_CONNECT) &&
 732                                 test_bit(wIndex, &ehci->companion_ports)) {
 733                         temp &= ~PORT_RWC_BITS;
 734                         temp |= PORT_OWNER;
 735                         ehci_writel(ehci, temp, status_reg);
 736                         ehci_dbg(ehci, "port %d --> companion\n", wIndex + 1);
 737                         temp = ehci_readl(ehci, status_reg);
 738                 }
 739
 740                 /*
 741                  * Even if OWNER is set, there's no harm letting khubd
 742                  * see the wPortStatus values (they should all be 0 except
 743                  * for PORT_POWER anyway).
 744                  */
 745
 746                 if (temp & PORT_CONNECT) {
 747                         status |= 1 << USB_PORT_FEAT_CONNECTION;
 748                         // status may be from integrated TT
 749                         status |= ehci_port_speed(ehci, temp);
 750                 }
 751                 if (temp & PORT_PE)
 752                         status |= 1 << USB_PORT_FEAT_ENABLE;
 753                 if (temp & (PORT_SUSPEND|PORT_RESUME))
 754                         status |= 1 << USB_PORT_FEAT_SUSPEND;
 755                 if (temp & PORT_OC)
 756                         status |= 1 << USB_PORT_FEAT_OVER_CURRENT;
 757                 if (temp & PORT_RESET)
 758                         status |= 1 << USB_PORT_FEAT_RESET;
 759                 if (temp & PORT_POWER)
 760                         status |= 1 << USB_PORT_FEAT_POWER;
 761
 762 #ifndef EHCI_VERBOSE_DEBUG
 763         if (status & ~0xffff)   /* only if wPortChange is interesting */
 764 #endif
 765                 dbg_port (ehci, "GetStatus", wIndex + 1, temp);
 766                 put_unaligned(cpu_to_le32 (status), (__le32 *) buf);
 767                 break;
 768         case SetHubFeature:
 769                 switch (wValue) {
 770                 case C_HUB_LOCAL_POWER:
 771                 case C_HUB_OVER_CURRENT:
 772                         /* no hub-wide feature/status flags */
 773                         break;
 774                 default:
 775                         goto error;
 776                 }
 777                 break;
 778         case SetPortFeature:
 779                 selector = wIndex >> 8;
 780                 wIndex &= 0xff;
 781                 if (!wIndex || wIndex > ports)
 782                         goto error;
 783                 wIndex--;
 784                 temp = ehci_readl(ehci, status_reg);
 785                 if (temp & PORT_OWNER)
 786                         break;
 787
 788                 temp &= ~PORT_RWC_BITS;
 789                 switch (wValue) {
 790                 case USB_PORT_FEAT_SUSPEND:
 791                         if (ehci->no_selective_suspend)
 792                                 break;
 793                         if ((temp & PORT_PE) == 0
 794                                         || (temp & PORT_RESET) != 0)
 795                                 goto error;
 796                         if (device_may_wakeup(&hcd->self.root_hub->dev))
 797                                 temp |= PORT_WAKE_BITS;
 798                         ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
 799                         break;
 800                 case USB_PORT_FEAT_POWER:
 801                         if (HCS_PPC (ehci->hcs_params))
 802                                 ehci_writel(ehci, temp | PORT_POWER,
 803                                                 status_reg);
 804                         break;
 805                 case USB_PORT_FEAT_RESET:
 806                         if (temp & PORT_RESUME)
 807                                 goto error;
 808                         /* line status bits may report this as low speed,
 809                          * which can be fine if this root hub has a
 810                          * transaction translator built in.
 811                          */
 812                         if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
 813                                         && !ehci_is_TDI(ehci)
 814                                         && PORT_USB11 (temp)) {
 815                                 ehci_dbg (ehci,
 816                                         "port %d low speed --> companion\n",
 817                                         wIndex + 1);
 818                                 temp |= PORT_OWNER;
 819                         } else {
 820                                 ehci_vdbg (ehci, "port %d reset\n", wIndex + 1);
 821                                 temp |= PORT_RESET;
 822                                 temp &= ~PORT_PE;
 823
 824                                 /*
 825                                  * caller must wait, then call GetPortStatus
 826                                  * usb 2.0 spec says 50 ms resets on root
 827                                  */
 828                                 ehci->reset_done [wIndex] = jiffies
 829                                                 + msecs_to_jiffies (50);
 830                         }
 831                         ehci_writel(ehci, temp, status_reg);
 832                         break;
 833
 834                 /* For downstream facing ports (these):  one hub port is put
 835                  * into test mode according to USB2 11.24.2.13, then the hub
 836                  * must be reset (which for root hub now means rmmod+modprobe,
 837                  * or else system reboot).  See EHCI 2.3.9 and 4.14 for info
 838                  * about the EHCI-specific stuff.
 839                  */
 840                 case USB_PORT_FEAT_TEST:
 841                         if (!selector || selector > 5)
 842                                 goto error;
 843                         ehci_quiesce(ehci);
 844                         ehci_halt(ehci);
 845                         temp |= selector << 16;
 846                         ehci_writel(ehci, temp, status_reg);
 847                         break;
 848
 849                 default:
 850                         goto error;
 851                 }
 852                 ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
 853                 break;
 854
 855         default:
 856 error:
 857                 /* "stall" on error */
 858                 retval = -EPIPE;
 859         }
 860         spin_unlock_irqrestore (&ehci->lock, flags);
 861         return retval;
 862 }