drivers/usb/host/ehci-hub.c

   1 /*
   2  * Copyright (C) 2001-2004 by David Brownell
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License as published by the
   6  * Free Software Foundation; either version 2 of the License, or (at your
   7  * option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  11  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software Foundation,
  16  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17  */
  18
  19 /* this file is part of ehci-hcd.c */
  20
  21 /*-------------------------------------------------------------------------*/
  22
  23 /*
  24  * EHCI Root Hub ... the nonsharable stuff
  25  *
  26  * Registers don't need cpu_to_le32, that happens transparently
  27  */
  28
  29 /*-------------------------------------------------------------------------*/
  30
  31 #ifdef  CONFIG_PM
  32
  33 static int ehci_bus_suspend (struct usb_hcd *hcd)
  34 {
  35         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
  36         int                     port;
  37         int                     mask;
  38
  39         ehci_dbg(ehci, "suspend root hub\n");
  40
  41         if (time_before (jiffies, ehci->next_statechange))
  42                 msleep(5);
  43
  44         port = HCS_N_PORTS (ehci->hcs_params);
  45         spin_lock_irq (&ehci->lock);
  46
  47         /* stop schedules, clean any completed work */
  48         if (HC_IS_RUNNING(hcd->state)) {
  49                 ehci_quiesce (ehci);
  50                 hcd->state = HC_STATE_QUIESCING;
  51         }
  52         ehci->command = ehci_readl(ehci, &ehci->regs->command);
  53         if (ehci->reclaim)
  54                 ehci->reclaim_ready = 1;
  55         ehci_work(ehci);
  56
  57         /* Unlike other USB host controller types, EHCI doesn't have
  58          * any notion of "global" or bus-wide suspend.  The driver has
  59          * to manually suspend all the active unsuspended ports, and
  60          * then manually resume them in the bus_resume() routine.
  61          */
  62         ehci->bus_suspended = 0;
  63         while (port--) {
  64                 u32 __iomem     *reg = &ehci->regs->port_status [port];
  65                 u32             t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
  66                 u32             t2 = t1;
  67
  68                 /* keep track of which ports we suspend */
  69                 if ((t1 & PORT_PE) && !(t1 & PORT_OWNER) &&
  70                                 !(t1 & PORT_SUSPEND)) {
  71                         t2 |= PORT_SUSPEND;
  72                         set_bit(port, &ehci->bus_suspended);
  73                 }
  74
  75                 /* enable remote wakeup on all ports */
  76                 if (device_may_wakeup(&hcd->self.root_hub->dev))
  77                         t2 |= PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E;
  78                 else
  79                         t2 &= ~(PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E);
  80
  81                 if (t1 != t2) {
  82                         ehci_vdbg (ehci, "port %d, %08x -> %08x\n",
  83                                 port + 1, t1, t2);
  84                         ehci_writel(ehci, t2, reg);
  85                 }
  86         }
  87
  88         /* turn off now-idle HC */
  89         del_timer_sync (&ehci->watchdog);
  90         ehci_halt (ehci);
  91         hcd->state = HC_STATE_SUSPENDED;
  92
  93         /* allow remote wakeup */
  94         mask = INTR_MASK;
  95         if (!device_may_wakeup(&hcd->self.root_hub->dev))
  96                 mask &= ~STS_PCD;
  97         ehci_writel(ehci, mask, &ehci->regs->intr_enable);
  98         ehci_readl(ehci, &ehci->regs->intr_enable);
  99
 100         ehci->next_statechange = jiffies + msecs_to_jiffies(10);
 101         spin_unlock_irq (&ehci->lock);
 102         return 0;
 103 }
 104
 105
 106 /* caller has locked the root hub, and should reset/reinit on error */
 107 static int ehci_bus_resume (struct usb_hcd *hcd)
 108 {
 109         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 110         u32                     temp;
 111         int                     i;
 112
 113         if (time_before (jiffies, ehci->next_statechange))
 114                 msleep(5);
 115         spin_lock_irq (&ehci->lock);
 116
 117         /* Ideally and we've got a real resume here, and no port's power
 118          * was lost.  (For PCI, that means Vaux was maintained.)  But we
 119          * could instead be restoring a swsusp snapshot -- so that BIOS was
 120          * the last user of the controller, not reset/pm hardware keeping
 121          * state we gave to it.
 122          */
 123         temp = ehci_readl(ehci, &ehci->regs->intr_enable);
 124         ehci_dbg(ehci, "resume root hub%s\n", temp ? "" : " after power loss");
 125
 126         /* at least some APM implementations will try to deliver
 127          * IRQs right away, so delay them until we're ready.
 128          */
 129         ehci_writel(ehci, 0, &ehci->regs->intr_enable);
 130
 131         /* re-init operational registers */
 132         ehci_writel(ehci, 0, &ehci->regs->segment);
 133         ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
 134         ehci_writel(ehci, (u32) ehci->async->qh_dma, &ehci->regs->async_next);
 135
 136         /* restore CMD_RUN, framelist size, and irq threshold */
 137         ehci_writel(ehci, ehci->command, &ehci->regs->command);
 138
 139         /* Some controller/firmware combinations need a delay during which
 140          * they set up the port statuses.  See Bugzilla #8190. */
 141         mdelay(8);
 142
 143         /* manually resume the ports we suspended during bus_suspend() */
 144         i = HCS_N_PORTS (ehci->hcs_params);
 145         while (i--) {
 146                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 147                 temp &= ~(PORT_RWC_BITS
 148                         | PORT_WKOC_E | PORT_WKDISC_E | PORT_WKCONN_E);
 149                 if (test_bit(i, &ehci->bus_suspended) &&
 150                                 (temp & PORT_SUSPEND)) {
 151                         ehci->reset_done [i] = jiffies + msecs_to_jiffies (20);
 152                         temp |= PORT_RESUME;
 153                 }
 154                 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
 155         }
 156         i = HCS_N_PORTS (ehci->hcs_params);
 157         mdelay (20);
 158         while (i--) {
 159                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 160                 if (test_bit(i, &ehci->bus_suspended) &&
 161                                 (temp & PORT_SUSPEND)) {
 162                         temp &= ~(PORT_RWC_BITS | PORT_RESUME);
 163                         ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
 164                         ehci_vdbg (ehci, "resumed port %d\n", i + 1);
 165                 }
 166         }
 167         (void) ehci_readl(ehci, &ehci->regs->command);
 168
 169         /* maybe re-activate the schedule(s) */
 170         temp = 0;
 171         if (ehci->async->qh_next.qh)
 172                 temp |= CMD_ASE;
 173         if (ehci->periodic_sched)
 174                 temp |= CMD_PSE;
 175         if (temp) {
 176                 ehci->command |= temp;
 177                 ehci_writel(ehci, ehci->command, &ehci->regs->command);
 178         }
 179
 180         ehci->next_statechange = jiffies + msecs_to_jiffies(5);
 181         hcd->state = HC_STATE_RUNNING;
 182
 183         /* Now we can safely re-enable irqs */
 184         ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
 185
 186         spin_unlock_irq (&ehci->lock);
 187         return 0;
 188 }
 189
 190 #else
 191
 192 #define ehci_bus_suspend        NULL
 193 #define ehci_bus_resume         NULL
 194
 195 #endif  /* CONFIG_PM */
 196
 197 /*-------------------------------------------------------------------------*/
 198
 199 /* Display the ports dedicated to the companion controller */
 200 static ssize_t show_companion(struct class_device *class_dev, char *buf)
 201 {
 202         struct ehci_hcd         *ehci;
 203         int                     nports, index, n;
 204         int                     count = PAGE_SIZE;
 205         char                    *ptr = buf;
 206
 207         ehci = hcd_to_ehci(bus_to_hcd(class_get_devdata(class_dev)));
 208         nports = HCS_N_PORTS(ehci->hcs_params);
 209
 210         for (index = 0; index < nports; ++index) {
 211                 if (test_bit(index, &ehci->companion_ports)) {
 212                         n = scnprintf(ptr, count, "%d\n", index + 1);
 213                         ptr += n;
 214                         count -= n;
 215                 }
 216         }
 217         return ptr - buf;
 218 }
 219
 220 /*
 221  * Dedicate or undedicate a port to the companion controller.
 222  * Syntax is "[-]portnum", where a leading '-' sign means
 223  * return control of the port to the EHCI controller.
 224  */
 225 static ssize_t store_companion(struct class_device *class_dev,
 226                 const char *buf, size_t count)
 227 {
 228         struct ehci_hcd         *ehci;
 229         int                     portnum, new_owner, try;
 230         u32 __iomem             *status_reg;
 231         u32                     port_status;
 232
 233         ehci = hcd_to_ehci(bus_to_hcd(class_get_devdata(class_dev)));
 234         new_owner = PORT_OWNER;         /* Owned by companion */
 235         if (sscanf(buf, "%d", &portnum) != 1)
 236                 return -EINVAL;
 237         if (portnum < 0) {
 238                 portnum = - portnum;
 239                 new_owner = 0;          /* Owned by EHCI */
 240         }
 241         if (portnum <= 0 || portnum > HCS_N_PORTS(ehci->hcs_params))
 242                 return -ENOENT;
 243         status_reg = &ehci->regs->port_status[--portnum];
 244         if (new_owner)
 245                 set_bit(portnum, &ehci->companion_ports);
 246         else
 247                 clear_bit(portnum, &ehci->companion_ports);
 248
 249         /*
 250          * The controller won't set the OWNER bit if the port is
 251          * enabled, so this loop will sometimes require at least two
 252          * iterations: one to disable the port and one to set OWNER.
 253          */
 254
 255         for (try = 4; try > 0; --try) {
 256                 spin_lock_irq(&ehci->lock);
 257                 port_status = ehci_readl(ehci, status_reg);
 258                 if ((port_status & PORT_OWNER) == new_owner
 259                                 || (port_status & (PORT_OWNER | PORT_CONNECT))
 260                                         == 0)
 261                         try = 0;
 262                 else {
 263                         port_status ^= PORT_OWNER;
 264                         port_status &= ~(PORT_PE | PORT_RWC_BITS);
 265                         ehci_writel(ehci, port_status, status_reg);
 266                 }
 267                 spin_unlock_irq(&ehci->lock);
 268                 if (try > 1)
 269                         msleep(5);
 270         }
 271         return count;
 272 }
 273 static CLASS_DEVICE_ATTR(companion, 0644, show_companion, store_companion);
 274
 275 static inline void create_companion_file(struct ehci_hcd *ehci)
 276 {
 277         int     i;
 278
 279         /* with integrated TT there is no companion! */
 280         if (!ehci_is_TDI(ehci))
 281                 i = class_device_create_file(ehci_to_hcd(ehci)->self.class_dev,
 282                                 &class_device_attr_companion);
 283 }
 284
 285 static inline void remove_companion_file(struct ehci_hcd *ehci)
 286 {
 287         /* with integrated TT there is no companion! */
 288         if (!ehci_is_TDI(ehci))
 289                 class_device_remove_file(ehci_to_hcd(ehci)->self.class_dev,
 290                                 &class_device_attr_companion);
 291 }
 292
 293
 294 /*-------------------------------------------------------------------------*/
 295
 296 static int check_reset_complete (
 297         struct ehci_hcd *ehci,
 298         int             index,
 299         u32 __iomem     *status_reg,
 300         int             port_status
 301 ) {
 302         if (!(port_status & PORT_CONNECT)) {
 303                 ehci->reset_done [index] = 0;
 304                 return port_status;
 305         }
 306
 307         /* if reset finished and it's still not enabled -- handoff */
 308         if (!(port_status & PORT_PE)) {
 309
 310                 /* with integrated TT, there's nobody to hand it to! */
 311                 if (ehci_is_TDI(ehci)) {
 312                         ehci_dbg (ehci,
 313                                 "Failed to enable port %d on root hub TT\n",
 314                                 index+1);
 315                         return port_status;
 316                 }
 317
 318                 ehci_dbg (ehci, "port %d full speed --> companion\n",
 319                         index + 1);
 320
 321                 // what happens if HCS_N_CC(params) == 0 ?
 322                 port_status |= PORT_OWNER;
 323                 port_status &= ~PORT_RWC_BITS;
 324                 ehci_writel(ehci, port_status, status_reg);
 325
 326         } else
 327                 ehci_dbg (ehci, "port %d high speed\n", index + 1);
 328
 329         return port_status;
 330 }
 331
 332 /*-------------------------------------------------------------------------*/
 333
 334
 335 /* build "status change" packet (one or two bytes) from HC registers */
 336
 337 static int
 338 ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
 339 {
 340         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 341         u32             temp, status = 0;
 342         u32             mask;
 343         int             ports, i, retval = 1;
 344         unsigned long   flags;
 345
 346         /* if !USB_SUSPEND, root hub timers won't get shut down ... */
 347         if (!HC_IS_RUNNING(hcd->state))
 348                 return 0;
 349
 350         /* init status to no-changes */
 351         buf [0] = 0;
 352         ports = HCS_N_PORTS (ehci->hcs_params);
 353         if (ports > 7) {
 354                 buf [1] = 0;
 355                 retval++;
 356         }
 357
 358         /* Some boards (mostly VIA?) report bogus overcurrent indications,
 359          * causing massive log spam unless we completely ignore them.  It
 360          * may be relevant that VIA VT8235 controlers, where PORT_POWER is
 361          * always set, seem to clear PORT_OCC and PORT_CSC when writing to
 362          * PORT_POWER; that's surprising, but maybe within-spec.
 363          */
 364         if (!ignore_oc)
 365                 mask = PORT_CSC | PORT_PEC | PORT_OCC;
 366         else
 367                 mask = PORT_CSC | PORT_PEC;
 368         // PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
 369
 370         /* no hub change reports (bit 0) for now (power, ...) */
 371
 372         /* port N changes (bit N)? */
 373         spin_lock_irqsave (&ehci->lock, flags);
 374         for (i = 0; i < ports; i++) {
 375                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 376
 377                 /*
 378                  * Return status information even for ports with OWNER set.
 379                  * Otherwise khubd wouldn't see the disconnect event when a
 380                  * high-speed device is switched over to the companion
 381                  * controller by the user.
 382                  */
 383
 384                 if (!(temp & PORT_CONNECT))
 385                         ehci->reset_done [i] = 0;
 386                 if ((temp & mask) != 0
 387                                 || ((temp & PORT_RESUME) != 0
 388                                         && time_after_eq(jiffies,
 389                                                 ehci->reset_done[i]))) {
 390                         if (i < 7)
 391                             buf [0] |= 1 << (i + 1);
 392                         else
 393                             buf [1] |= 1 << (i - 7);
 394                         status = STS_PCD;
 395                 }
 396         }
 397         /* FIXME autosuspend idle root hubs */
 398         spin_unlock_irqrestore (&ehci->lock, flags);
 399         return status ? retval : 0;
 400 }
 401
 402 /*-------------------------------------------------------------------------*/
 403
 404 static void
 405 ehci_hub_descriptor (
 406         struct ehci_hcd                 *ehci,
 407         struct usb_hub_descriptor       *desc
 408 ) {
 409         int             ports = HCS_N_PORTS (ehci->hcs_params);
 410         u16             temp;
 411
 412         desc->bDescriptorType = 0x29;
 413         desc->bPwrOn2PwrGood = 10;      /* ehci 1.0, 2.3.9 says 20ms max */
 414         desc->bHubContrCurrent = 0;
 415
 416         desc->bNbrPorts = ports;
 417         temp = 1 + (ports / 8);
 418         desc->bDescLength = 7 + 2 * temp;
 419
 420         /* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
 421         memset (&desc->bitmap [0], 0, temp);
 422         memset (&desc->bitmap [temp], 0xff, temp);
 423
 424         temp = 0x0008;                  /* per-port overcurrent reporting */
 425         if (HCS_PPC (ehci->hcs_params))
 426                 temp |= 0x0001;         /* per-port power control */
 427         else
 428                 temp |= 0x0002;         /* no power switching */
 429 #if 0
 430 // re-enable when we support USB_PORT_FEAT_INDICATOR below.
 431         if (HCS_INDICATOR (ehci->hcs_params))
 432                 temp |= 0x0080;         /* per-port indicators (LEDs) */
 433 #endif
 434         desc->wHubCharacteristics = (__force __u16)cpu_to_le16 (temp);
 435 }
 436
 437 /*-------------------------------------------------------------------------*/
 438
 439 #define PORT_WAKE_BITS  (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
 440
 441 static int ehci_hub_control (
 442         struct usb_hcd  *hcd,
 443         u16             typeReq,
 444         u16             wValue,
 445         u16             wIndex,
 446         char            *buf,
 447         u16             wLength
 448 ) {
 449         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 450         int             ports = HCS_N_PORTS (ehci->hcs_params);
 451         u32 __iomem     *status_reg = &ehci->regs->port_status[wIndex - 1];
 452         u32             temp, status;
 453         unsigned long   flags;
 454         int             retval = 0;
 455         unsigned        selector;
 456
 457         /*
 458          * FIXME:  support SetPortFeatures USB_PORT_FEAT_INDICATOR.
 459          * HCS_INDICATOR may say we can change LEDs to off/amber/green.
 460          * (track current state ourselves) ... blink for diagnostics,
 461          * power, "this is the one", etc.  EHCI spec supports this.
 462          */
 463
 464         spin_lock_irqsave (&ehci->lock, flags);
 465         switch (typeReq) {
 466         case ClearHubFeature:
 467                 switch (wValue) {
 468                 case C_HUB_LOCAL_POWER:
 469                 case C_HUB_OVER_CURRENT:
 470                         /* no hub-wide feature/status flags */
 471                         break;
 472                 default:
 473                         goto error;
 474                 }
 475                 break;
 476         case ClearPortFeature:
 477                 if (!wIndex || wIndex > ports)
 478                         goto error;
 479                 wIndex--;
 480                 temp = ehci_readl(ehci, status_reg);
 481
 482                 /*
 483                  * Even if OWNER is set, so the port is owned by the
 484                  * companion controller, khubd needs to be able to clear
 485                  * the port-change status bits (especially
 486                  * USB_PORT_FEAT_C_CONNECTION).
 487                  */
 488
 489                 switch (wValue) {
 490                 case USB_PORT_FEAT_ENABLE:
 491                         ehci_writel(ehci, temp & ~PORT_PE, status_reg);
 492                         break;
 493                 case USB_PORT_FEAT_C_ENABLE:
 494                         ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_PEC,
 495                                         status_reg);
 496                         break;
 497                 case USB_PORT_FEAT_SUSPEND:
 498                         if (temp & PORT_RESET)
 499                                 goto error;
 500                         if (ehci->no_selective_suspend)
 501                                 break;
 502                         if (temp & PORT_SUSPEND) {
 503                                 if ((temp & PORT_PE) == 0)
 504                                         goto error;
 505                                 /* resume signaling for 20 msec */
 506                                 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
 507                                 ehci_writel(ehci, temp | PORT_RESUME,
 508                                                 status_reg);
 509                                 ehci->reset_done [wIndex] = jiffies
 510                                                 + msecs_to_jiffies (20);
 511                         }
 512                         break;
 513                 case USB_PORT_FEAT_C_SUSPEND:
 514                         /* we auto-clear this feature */
 515                         break;
 516                 case USB_PORT_FEAT_POWER:
 517                         if (HCS_PPC (ehci->hcs_params))
 518                                 ehci_writel(ehci,
 519                                           temp & ~(PORT_RWC_BITS | PORT_POWER),
 520                                           status_reg);
 521                         break;
 522                 case USB_PORT_FEAT_C_CONNECTION:
 523                         ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_CSC,
 524                                         status_reg);
 525                         break;
 526                 case USB_PORT_FEAT_C_OVER_CURRENT:
 527                         ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_OCC,
 528                                         status_reg);
 529                         break;
 530                 case USB_PORT_FEAT_C_RESET:
 531                         /* GetPortStatus clears reset */
 532                         break;
 533                 default:
 534                         goto error;
 535                 }
 536                 ehci_readl(ehci, &ehci->regs->command); /* unblock posted write */
 537                 break;
 538         case GetHubDescriptor:
 539                 ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
 540                         buf);
 541                 break;
 542         case GetHubStatus:
 543                 /* no hub-wide feature/status flags */
 544                 memset (buf, 0, 4);
 545                 //cpu_to_le32s ((u32 *) buf);
 546                 break;
 547         case GetPortStatus:
 548                 if (!wIndex || wIndex > ports)
 549                         goto error;
 550                 wIndex--;
 551                 status = 0;
 552                 temp = ehci_readl(ehci, status_reg);
 553
 554                 // wPortChange bits
 555                 if (temp & PORT_CSC)
 556                         status |= 1 << USB_PORT_FEAT_C_CONNECTION;
 557                 if (temp & PORT_PEC)
 558                         status |= 1 << USB_PORT_FEAT_C_ENABLE;
 559                 if ((temp & PORT_OCC) && !ignore_oc)
 560                         status |= 1 << USB_PORT_FEAT_C_OVER_CURRENT;
 561
 562                 /* whoever resumes must GetPortStatus to complete it!! */
 563                 if (temp & PORT_RESUME) {
 564
 565                         /* Remote Wakeup received? */
 566                         if (!ehci->reset_done[wIndex]) {
 567                                 /* resume signaling for 20 msec */
 568                                 ehci->reset_done[wIndex] = jiffies
 569                                                 + msecs_to_jiffies(20);
 570                                 /* check the port again */
 571                                 mod_timer(&ehci_to_hcd(ehci)->rh_timer,
 572                                                 ehci->reset_done[wIndex]);
 573                         }
 574
 575                         /* resume completed? */
 576                         else if (time_after_eq(jiffies,
 577                                         ehci->reset_done[wIndex])) {
 578                                 status |= 1 << USB_PORT_FEAT_C_SUSPEND;
 579                                 ehci->reset_done[wIndex] = 0;
 580
 581                                 /* stop resume signaling */
 582                                 temp = ehci_readl(ehci, status_reg);
 583                                 ehci_writel(ehci,
 584                                         temp & ~(PORT_RWC_BITS | PORT_RESUME),
 585                                         status_reg);
 586                                 retval = handshake(ehci, status_reg,
 587                                            PORT_RESUME, 0, 2000 /* 2msec */);
 588                                 if (retval != 0) {
 589                                         ehci_err(ehci,
 590                                                 "port %d resume error %d\n",
 591                                                 wIndex + 1, retval);
 592                                         goto error;
 593                                 }
 594                                 temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10));
 595                         }
 596                 }
 597
 598                 /* whoever resets must GetPortStatus to complete it!! */
 599                 if ((temp & PORT_RESET)
 600                                 && time_after_eq(jiffies,
 601                                         ehci->reset_done[wIndex])) {
 602                         status |= 1 << USB_PORT_FEAT_C_RESET;
 603                         ehci->reset_done [wIndex] = 0;
 604
 605                         /* force reset to complete */
 606                         ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESET),
 607                                         status_reg);
 608                         /* REVISIT:  some hardware needs 550+ usec to clear
 609                          * this bit; seems too long to spin routinely...
 610                          */
 611                         retval = handshake(ehci, status_reg,
 612                                         PORT_RESET, 0, 750);
 613                         if (retval != 0) {
 614                                 ehci_err (ehci, "port %d reset error %d\n",
 615                                         wIndex + 1, retval);
 616                                 goto error;
 617                         }
 618
 619                         /* see what we found out */
 620                         temp = check_reset_complete (ehci, wIndex, status_reg,
 621                                         ehci_readl(ehci, status_reg));
 622                 }
 623
 624                 /* transfer dedicated ports to the companion hc */
 625                 if ((temp & PORT_CONNECT) &&
 626                                 test_bit(wIndex, &ehci->companion_ports)) {
 627                         temp &= ~PORT_RWC_BITS;
 628                         temp |= PORT_OWNER;
 629                         ehci_writel(ehci, temp, status_reg);
 630                         ehci_dbg(ehci, "port %d --> companion\n", wIndex + 1);
 631                         temp = ehci_readl(ehci, status_reg);
 632                 }
 633
 634                 /*
 635                  * Even if OWNER is set, there's no harm letting khubd
 636                  * see the wPortStatus values (they should all be 0 except
 637                  * for PORT_POWER anyway).
 638                  */
 639
 640                 if (temp & PORT_CONNECT) {
 641                         status |= 1 << USB_PORT_FEAT_CONNECTION;
 642                         // status may be from integrated TT
 643                         status |= ehci_port_speed(ehci, temp);
 644                 }
 645                 if (temp & PORT_PE)
 646                         status |= 1 << USB_PORT_FEAT_ENABLE;
 647                 if (temp & (PORT_SUSPEND|PORT_RESUME))
 648                         status |= 1 << USB_PORT_FEAT_SUSPEND;
 649                 if (temp & PORT_OC)
 650                         status |= 1 << USB_PORT_FEAT_OVER_CURRENT;
 651                 if (temp & PORT_RESET)
 652                         status |= 1 << USB_PORT_FEAT_RESET;
 653                 if (temp & PORT_POWER)
 654                         status |= 1 << USB_PORT_FEAT_POWER;
 655
 656 #ifndef EHCI_VERBOSE_DEBUG
 657         if (status & ~0xffff)   /* only if wPortChange is interesting */
 658 #endif
 659                 dbg_port (ehci, "GetStatus", wIndex + 1, temp);
 660                 put_unaligned(cpu_to_le32 (status), (__le32 *) buf);
 661                 break;
 662         case SetHubFeature:
 663                 switch (wValue) {
 664                 case C_HUB_LOCAL_POWER:
 665                 case C_HUB_OVER_CURRENT:
 666                         /* no hub-wide feature/status flags */
 667                         break;
 668                 default:
 669                         goto error;
 670                 }
 671                 break;
 672         case SetPortFeature:
 673                 selector = wIndex >> 8;
 674                 wIndex &= 0xff;
 675                 if (!wIndex || wIndex > ports)
 676                         goto error;
 677                 wIndex--;
 678                 temp = ehci_readl(ehci, status_reg);
 679                 if (temp & PORT_OWNER)
 680                         break;
 681
 682                 temp &= ~PORT_RWC_BITS;
 683                 switch (wValue) {
 684                 case USB_PORT_FEAT_SUSPEND:
 685                         if (ehci->no_selective_suspend)
 686                                 break;
 687                         if ((temp & PORT_PE) == 0
 688                                         || (temp & PORT_RESET) != 0)
 689                                 goto error;
 690                         if (device_may_wakeup(&hcd->self.root_hub->dev))
 691                                 temp |= PORT_WAKE_BITS;
 692                         ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
 693                         break;
 694                 case USB_PORT_FEAT_POWER:
 695                         if (HCS_PPC (ehci->hcs_params))
 696                                 ehci_writel(ehci, temp | PORT_POWER,
 697                                                 status_reg);
 698                         break;
 699                 case USB_PORT_FEAT_RESET:
 700                         if (temp & PORT_RESUME)
 701                                 goto error;
 702                         /* line status bits may report this as low speed,
 703                          * which can be fine if this root hub has a
 704                          * transaction translator built in.
 705                          */
 706                         if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
 707                                         && !ehci_is_TDI(ehci)
 708                                         && PORT_USB11 (temp)) {
 709                                 ehci_dbg (ehci,
 710                                         "port %d low speed --> companion\n",
 711                                         wIndex + 1);
 712                                 temp |= PORT_OWNER;
 713                         } else {
 714                                 ehci_vdbg (ehci, "port %d reset\n", wIndex + 1);
 715                                 temp |= PORT_RESET;
 716                                 temp &= ~PORT_PE;
 717
 718                                 /*
 719                                  * caller must wait, then call GetPortStatus
 720                                  * usb 2.0 spec says 50 ms resets on root
 721                                  */
 722                                 ehci->reset_done [wIndex] = jiffies
 723                                                 + msecs_to_jiffies (50);
 724                         }
 725                         ehci_writel(ehci, temp, status_reg);
 726                         break;
 727
 728                 /* For downstream facing ports (these):  one hub port is put
 729                  * into test mode according to USB2 11.24.2.13, then the hub
 730                  * must be reset (which for root hub now means rmmod+modprobe,
 731                  * or else system reboot).  See EHCI 2.3.9 and 4.14 for info
 732                  * about the EHCI-specific stuff.
 733                  */
 734                 case USB_PORT_FEAT_TEST:
 735                         if (!selector || selector > 5)
 736                                 goto error;
 737                         ehci_quiesce(ehci);
 738                         ehci_halt(ehci);
 739                         temp |= selector << 16;
 740                         ehci_writel(ehci, temp, status_reg);
 741                         break;
 742
 743                 default:
 744                         goto error;
 745                 }
 746                 ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
 747                 break;
 748
 749         default:
 750 error:
 751                 /* "stall" on error */
 752                 retval = -EPIPE;
 753         }
 754         spin_unlock_irqrestore (&ehci->lock, flags);
 755         return retval;
 756 }