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_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         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         mdelay(8);
 233
 234         /* manually resume the ports we suspended during bus_suspend() */
 235         i = HCS_N_PORTS (ehci->hcs_params);
 236         while (i--) {
 237                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 238                 temp &= ~(PORT_RWC_BITS
 239                         | PORT_WKOC_E | PORT_WKDISC_E | PORT_WKCONN_E);
 240                 if (test_bit(i, &ehci->bus_suspended) &&
 241                                 (temp & PORT_SUSPEND)) {
 242                         ehci->reset_done [i] = jiffies + msecs_to_jiffies (20);
 243                         temp |= PORT_RESUME;
 244                 }
 245                 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
 246         }
 247         i = HCS_N_PORTS (ehci->hcs_params);
 248         mdelay (20);
 249         while (i--) {
 250                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 251                 if (test_bit(i, &ehci->bus_suspended) &&
 252                                 (temp & PORT_SUSPEND)) {
 253                         temp &= ~(PORT_RWC_BITS | PORT_RESUME);
 254                         ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
 255                         ehci_vdbg (ehci, "resumed port %d\n", i + 1);
 256                 }
 257         }
 258         (void) ehci_readl(ehci, &ehci->regs->command);
 259
 260         /* maybe re-activate the schedule(s) */
 261         temp = 0;
 262         if (ehci->async->qh_next.qh)
 263                 temp |= CMD_ASE;
 264         if (ehci->periodic_sched)
 265                 temp |= CMD_PSE;
 266         if (temp) {
 267                 ehci->command |= temp;
 268                 ehci_writel(ehci, ehci->command, &ehci->regs->command);
 269         }
 270
 271         ehci->next_statechange = jiffies + msecs_to_jiffies(5);
 272         hcd->state = HC_STATE_RUNNING;
 273
 274         /* Now we can safely re-enable irqs */
 275         ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
 276
 277         spin_unlock_irq (&ehci->lock);
 278
 279         if (!power_okay)
 280                 ehci_handover_companion_ports(ehci);
 281         return 0;
 282 }
 283
 284 #else
 285
 286 #define ehci_bus_suspend        NULL
 287 #define ehci_bus_resume         NULL
 288
 289 #endif  /* CONFIG_PM */
 290
 291 /*-------------------------------------------------------------------------*/
 292
 293 /* Display the ports dedicated to the companion controller */
 294 static ssize_t show_companion(struct class_device *class_dev, char *buf)
 295 {
 296         struct ehci_hcd         *ehci;
 297         int                     nports, index, n;
 298         int                     count = PAGE_SIZE;
 299         char                    *ptr = buf;
 300
 301         ehci = hcd_to_ehci(bus_to_hcd(class_get_devdata(class_dev)));
 302         nports = HCS_N_PORTS(ehci->hcs_params);
 303
 304         for (index = 0; index < nports; ++index) {
 305                 if (test_bit(index, &ehci->companion_ports)) {
 306                         n = scnprintf(ptr, count, "%d\n", index + 1);
 307                         ptr += n;
 308                         count -= n;
 309                 }
 310         }
 311         return ptr - buf;
 312 }
 313
 314 /*
 315  * Dedicate or undedicate a port to the companion controller.
 316  * Syntax is "[-]portnum", where a leading '-' sign means
 317  * return control of the port to the EHCI controller.
 318  */
 319 static ssize_t store_companion(struct class_device *class_dev,
 320                 const char *buf, size_t count)
 321 {
 322         struct ehci_hcd         *ehci;
 323         int                     portnum, new_owner, try;
 324         u32 __iomem             *status_reg;
 325         u32                     port_status;
 326
 327         ehci = hcd_to_ehci(bus_to_hcd(class_get_devdata(class_dev)));
 328         new_owner = PORT_OWNER;         /* Owned by companion */
 329         if (sscanf(buf, "%d", &portnum) != 1)
 330                 return -EINVAL;
 331         if (portnum < 0) {
 332                 portnum = - portnum;
 333                 new_owner = 0;          /* Owned by EHCI */
 334         }
 335         if (portnum <= 0 || portnum > HCS_N_PORTS(ehci->hcs_params))
 336                 return -ENOENT;
 337         status_reg = &ehci->regs->port_status[--portnum];
 338         if (new_owner)
 339                 set_bit(portnum, &ehci->companion_ports);
 340         else
 341                 clear_bit(portnum, &ehci->companion_ports);
 342
 343         /*
 344          * The controller won't set the OWNER bit if the port is
 345          * enabled, so this loop will sometimes require at least two
 346          * iterations: one to disable the port and one to set OWNER.
 347          */
 348
 349         for (try = 4; try > 0; --try) {
 350                 spin_lock_irq(&ehci->lock);
 351                 port_status = ehci_readl(ehci, status_reg);
 352                 if ((port_status & PORT_OWNER) == new_owner
 353                                 || (port_status & (PORT_OWNER | PORT_CONNECT))
 354                                         == 0)
 355                         try = 0;
 356                 else {
 357                         port_status ^= PORT_OWNER;
 358                         port_status &= ~(PORT_PE | PORT_RWC_BITS);
 359                         ehci_writel(ehci, port_status, status_reg);
 360                 }
 361                 spin_unlock_irq(&ehci->lock);
 362                 if (try > 1)
 363                         msleep(5);
 364         }
 365         return count;
 366 }
 367 static CLASS_DEVICE_ATTR(companion, 0644, show_companion, store_companion);
 368
 369 static inline void create_companion_file(struct ehci_hcd *ehci)
 370 {
 371         int     i;
 372
 373         /* with integrated TT there is no companion! */
 374         if (!ehci_is_TDI(ehci))
 375                 i = class_device_create_file(ehci_to_hcd(ehci)->self.class_dev,
 376                                 &class_device_attr_companion);
 377 }
 378
 379 static inline void remove_companion_file(struct ehci_hcd *ehci)
 380 {
 381         /* with integrated TT there is no companion! */
 382         if (!ehci_is_TDI(ehci))
 383                 class_device_remove_file(ehci_to_hcd(ehci)->self.class_dev,
 384                                 &class_device_attr_companion);
 385 }
 386
 387
 388 /*-------------------------------------------------------------------------*/
 389
 390 static int check_reset_complete (
 391         struct ehci_hcd *ehci,
 392         int             index,
 393         u32 __iomem     *status_reg,
 394         int             port_status
 395 ) {
 396         if (!(port_status & PORT_CONNECT)) {
 397                 ehci->reset_done [index] = 0;
 398                 return port_status;
 399         }
 400
 401         /* if reset finished and it's still not enabled -- handoff */
 402         if (!(port_status & PORT_PE)) {
 403
 404                 /* with integrated TT, there's nobody to hand it to! */
 405                 if (ehci_is_TDI(ehci)) {
 406                         ehci_dbg (ehci,
 407                                 "Failed to enable port %d on root hub TT\n",
 408                                 index+1);
 409                         return port_status;
 410                 }
 411
 412                 ehci_dbg (ehci, "port %d full speed --> companion\n",
 413                         index + 1);
 414
 415                 // what happens if HCS_N_CC(params) == 0 ?
 416                 port_status |= PORT_OWNER;
 417                 port_status &= ~PORT_RWC_BITS;
 418                 ehci_writel(ehci, port_status, status_reg);
 419
 420         } else
 421                 ehci_dbg (ehci, "port %d high speed\n", index + 1);
 422
 423         return port_status;
 424 }
 425
 426 /*-------------------------------------------------------------------------*/
 427
 428
 429 /* build "status change" packet (one or two bytes) from HC registers */
 430
 431 static int
 432 ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
 433 {
 434         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 435         u32             temp, status = 0;
 436         u32             mask;
 437         int             ports, i, retval = 1;
 438         unsigned long   flags;
 439
 440         /* if !USB_SUSPEND, root hub timers won't get shut down ... */
 441         if (!HC_IS_RUNNING(hcd->state))
 442                 return 0;
 443
 444         /* init status to no-changes */
 445         buf [0] = 0;
 446         ports = HCS_N_PORTS (ehci->hcs_params);
 447         if (ports > 7) {
 448                 buf [1] = 0;
 449                 retval++;
 450         }
 451
 452         /* Some boards (mostly VIA?) report bogus overcurrent indications,
 453          * causing massive log spam unless we completely ignore them.  It
 454          * may be relevant that VIA VT8235 controlers, where PORT_POWER is
 455          * always set, seem to clear PORT_OCC and PORT_CSC when writing to
 456          * PORT_POWER; that's surprising, but maybe within-spec.
 457          */
 458         if (!ignore_oc)
 459                 mask = PORT_CSC | PORT_PEC | PORT_OCC;
 460         else
 461                 mask = PORT_CSC | PORT_PEC;
 462         // PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
 463
 464         /* no hub change reports (bit 0) for now (power, ...) */
 465
 466         /* port N changes (bit N)? */
 467         spin_lock_irqsave (&ehci->lock, flags);
 468         for (i = 0; i < ports; i++) {
 469                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 470
 471                 /*
 472                  * Return status information even for ports with OWNER set.
 473                  * Otherwise khubd wouldn't see the disconnect event when a
 474                  * high-speed device is switched over to the companion
 475                  * controller by the user.
 476                  */
 477
 478                 if (!(temp & PORT_CONNECT))
 479                         ehci->reset_done [i] = 0;
 480                 if ((temp & mask) != 0
 481                                 || ((temp & PORT_RESUME) != 0
 482                                         && time_after_eq(jiffies,
 483                                                 ehci->reset_done[i]))) {
 484                         if (i < 7)
 485                             buf [0] |= 1 << (i + 1);
 486                         else
 487                             buf [1] |= 1 << (i - 7);
 488                         status = STS_PCD;
 489                 }
 490         }
 491         /* FIXME autosuspend idle root hubs */
 492         spin_unlock_irqrestore (&ehci->lock, flags);
 493         return status ? retval : 0;
 494 }
 495
 496 /*-------------------------------------------------------------------------*/
 497
 498 static void
 499 ehci_hub_descriptor (
 500         struct ehci_hcd                 *ehci,
 501         struct usb_hub_descriptor       *desc
 502 ) {
 503         int             ports = HCS_N_PORTS (ehci->hcs_params);
 504         u16             temp;
 505
 506         desc->bDescriptorType = 0x29;
 507         desc->bPwrOn2PwrGood = 10;      /* ehci 1.0, 2.3.9 says 20ms max */
 508         desc->bHubContrCurrent = 0;
 509
 510         desc->bNbrPorts = ports;
 511         temp = 1 + (ports / 8);
 512         desc->bDescLength = 7 + 2 * temp;
 513
 514         /* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
 515         memset (&desc->bitmap [0], 0, temp);
 516         memset (&desc->bitmap [temp], 0xff, temp);
 517
 518         temp = 0x0008;                  /* per-port overcurrent reporting */
 519         if (HCS_PPC (ehci->hcs_params))
 520                 temp |= 0x0001;         /* per-port power control */
 521         else
 522                 temp |= 0x0002;         /* no power switching */
 523 #if 0
 524 // re-enable when we support USB_PORT_FEAT_INDICATOR below.
 525         if (HCS_INDICATOR (ehci->hcs_params))
 526                 temp |= 0x0080;         /* per-port indicators (LEDs) */
 527 #endif
 528         desc->wHubCharacteristics = (__force __u16)cpu_to_le16 (temp);
 529 }
 530
 531 /*-------------------------------------------------------------------------*/
 532
 533 #define PORT_WAKE_BITS  (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
 534
 535 static int ehci_hub_control (
 536         struct usb_hcd  *hcd,
 537         u16             typeReq,
 538         u16             wValue,
 539         u16             wIndex,
 540         char            *buf,
 541         u16             wLength
 542 ) {
 543         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 544         int             ports = HCS_N_PORTS (ehci->hcs_params);
 545         u32 __iomem     *status_reg = &ehci->regs->port_status[
 546                                 (wIndex & 0xff) - 1];
 547         u32             temp, status;
 548         unsigned long   flags;
 549         int             retval = 0;
 550         unsigned        selector;
 551
 552         /*
 553          * FIXME:  support SetPortFeatures USB_PORT_FEAT_INDICATOR.
 554          * HCS_INDICATOR may say we can change LEDs to off/amber/green.
 555          * (track current state ourselves) ... blink for diagnostics,
 556          * power, "this is the one", etc.  EHCI spec supports this.
 557          */
 558
 559         spin_lock_irqsave (&ehci->lock, flags);
 560         switch (typeReq) {
 561         case ClearHubFeature:
 562                 switch (wValue) {
 563                 case C_HUB_LOCAL_POWER:
 564                 case C_HUB_OVER_CURRENT:
 565                         /* no hub-wide feature/status flags */
 566                         break;
 567                 default:
 568                         goto error;
 569                 }
 570                 break;
 571         case ClearPortFeature:
 572                 if (!wIndex || wIndex > ports)
 573                         goto error;
 574                 wIndex--;
 575                 temp = ehci_readl(ehci, status_reg);
 576
 577                 /*
 578                  * Even if OWNER is set, so the port is owned by the
 579                  * companion controller, khubd needs to be able to clear
 580                  * the port-change status bits (especially
 581                  * USB_PORT_FEAT_C_CONNECTION).
 582                  */
 583
 584                 switch (wValue) {
 585                 case USB_PORT_FEAT_ENABLE:
 586                         ehci_writel(ehci, temp & ~PORT_PE, status_reg);
 587                         break;
 588                 case USB_PORT_FEAT_C_ENABLE:
 589                         ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_PEC,
 590                                         status_reg);
 591                         break;
 592                 case USB_PORT_FEAT_SUSPEND:
 593                         if (temp & PORT_RESET)
 594                                 goto error;
 595                         if (ehci->no_selective_suspend)
 596                                 break;
 597                         if (temp & PORT_SUSPEND) {
 598                                 if ((temp & PORT_PE) == 0)
 599                                         goto error;
 600                                 /* resume signaling for 20 msec */
 601                                 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
 602                                 ehci_writel(ehci, temp | PORT_RESUME,
 603                                                 status_reg);
 604                                 ehci->reset_done [wIndex] = jiffies
 605                                                 + msecs_to_jiffies (20);
 606                         }
 607                         break;
 608                 case USB_PORT_FEAT_C_SUSPEND:
 609                         /* we auto-clear this feature */
 610                         break;
 611                 case USB_PORT_FEAT_POWER:
 612                         if (HCS_PPC (ehci->hcs_params))
 613                                 ehci_writel(ehci,
 614                                           temp & ~(PORT_RWC_BITS | PORT_POWER),
 615                                           status_reg);
 616                         break;
 617                 case USB_PORT_FEAT_C_CONNECTION:
 618                         ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_CSC,
 619                                         status_reg);
 620                         break;
 621                 case USB_PORT_FEAT_C_OVER_CURRENT:
 622                         ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_OCC,
 623                                         status_reg);
 624                         break;
 625                 case USB_PORT_FEAT_C_RESET:
 626                         /* GetPortStatus clears reset */
 627                         break;
 628                 default:
 629                         goto error;
 630                 }
 631                 ehci_readl(ehci, &ehci->regs->command); /* unblock posted write */
 632                 break;
 633         case GetHubDescriptor:
 634                 ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
 635                         buf);
 636                 break;
 637         case GetHubStatus:
 638                 /* no hub-wide feature/status flags */
 639                 memset (buf, 0, 4);
 640                 //cpu_to_le32s ((u32 *) buf);
 641                 break;
 642         case GetPortStatus:
 643                 if (!wIndex || wIndex > ports)
 644                         goto error;
 645                 wIndex--;
 646                 status = 0;
 647                 temp = ehci_readl(ehci, status_reg);
 648
 649                 // wPortChange bits
 650                 if (temp & PORT_CSC)
 651                         status |= 1 << USB_PORT_FEAT_C_CONNECTION;
 652                 if (temp & PORT_PEC)
 653                         status |= 1 << USB_PORT_FEAT_C_ENABLE;
 654
 655                 if ((temp & PORT_OCC) && !ignore_oc){
 656                         status |= 1 << USB_PORT_FEAT_C_OVER_CURRENT;
 657
 658                         /*
 659                          * Hubs should disable port power on over-current.
 660                          * However, not all EHCI implementations do this
 661                          * automatically, even if they _do_ support per-port
 662                          * power switching; they're allowed to just limit the
 663                          * current.  khubd will turn the power back on.
 664                          */
 665                         if (HCS_PPC (ehci->hcs_params)){
 666                                 ehci_writel(ehci,
 667                                         temp & ~(PORT_RWC_BITS | PORT_POWER),
 668                                         status_reg);
 669                         }
 670                 }
 671
 672                 /* whoever resumes must GetPortStatus to complete it!! */
 673                 if (temp & PORT_RESUME) {
 674
 675                         /* Remote Wakeup received? */
 676                         if (!ehci->reset_done[wIndex]) {
 677                                 /* resume signaling for 20 msec */
 678                                 ehci->reset_done[wIndex] = jiffies
 679                                                 + msecs_to_jiffies(20);
 680                                 /* check the port again */
 681                                 mod_timer(&ehci_to_hcd(ehci)->rh_timer,
 682                                                 ehci->reset_done[wIndex]);
 683                         }
 684
 685                         /* resume completed? */
 686                         else if (time_after_eq(jiffies,
 687                                         ehci->reset_done[wIndex])) {
 688                                 status |= 1 << USB_PORT_FEAT_C_SUSPEND;
 689                                 ehci->reset_done[wIndex] = 0;
 690
 691                                 /* stop resume signaling */
 692                                 temp = ehci_readl(ehci, status_reg);
 693                                 ehci_writel(ehci,
 694                                         temp & ~(PORT_RWC_BITS | PORT_RESUME),
 695                                         status_reg);
 696                                 retval = handshake(ehci, status_reg,
 697                                            PORT_RESUME, 0, 2000 /* 2msec */);
 698                                 if (retval != 0) {
 699                                         ehci_err(ehci,
 700                                                 "port %d resume error %d\n",
 701                                                 wIndex + 1, retval);
 702                                         goto error;
 703                                 }
 704                                 temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10));
 705                         }
 706                 }
 707
 708                 /* whoever resets must GetPortStatus to complete it!! */
 709                 if ((temp & PORT_RESET)
 710                                 && time_after_eq(jiffies,
 711                                         ehci->reset_done[wIndex])) {
 712                         status |= 1 << USB_PORT_FEAT_C_RESET;
 713                         ehci->reset_done [wIndex] = 0;
 714
 715                         /* force reset to complete */
 716                         ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESET),
 717                                         status_reg);
 718                         /* REVISIT:  some hardware needs 550+ usec to clear
 719                          * this bit; seems too long to spin routinely...
 720                          */
 721                         retval = handshake(ehci, status_reg,
 722                                         PORT_RESET, 0, 750);
 723                         if (retval != 0) {
 724                                 ehci_err (ehci, "port %d reset error %d\n",
 725                                         wIndex + 1, retval);
 726                                 goto error;
 727                         }
 728
 729                         /* see what we found out */
 730                         temp = check_reset_complete (ehci, wIndex, status_reg,
 731                                         ehci_readl(ehci, status_reg));
 732                 }
 733
 734                 /* transfer dedicated ports to the companion hc */
 735                 if ((temp & PORT_CONNECT) &&
 736                                 test_bit(wIndex, &ehci->companion_ports)) {
 737                         temp &= ~PORT_RWC_BITS;
 738                         temp |= PORT_OWNER;
 739                         ehci_writel(ehci, temp, status_reg);
 740                         ehci_dbg(ehci, "port %d --> companion\n", wIndex + 1);
 741                         temp = ehci_readl(ehci, status_reg);
 742                 }
 743
 744                 /*
 745                  * Even if OWNER is set, there's no harm letting khubd
 746                  * see the wPortStatus values (they should all be 0 except
 747                  * for PORT_POWER anyway).
 748                  */
 749
 750                 if (temp & PORT_CONNECT) {
 751                         status |= 1 << USB_PORT_FEAT_CONNECTION;
 752                         // status may be from integrated TT
 753                         status |= ehci_port_speed(ehci, temp);
 754                 }
 755                 if (temp & PORT_PE)
 756                         status |= 1 << USB_PORT_FEAT_ENABLE;
 757                 if (temp & (PORT_SUSPEND|PORT_RESUME))
 758                         status |= 1 << USB_PORT_FEAT_SUSPEND;
 759                 if (temp & PORT_OC)
 760                         status |= 1 << USB_PORT_FEAT_OVER_CURRENT;
 761                 if (temp & PORT_RESET)
 762                         status |= 1 << USB_PORT_FEAT_RESET;
 763                 if (temp & PORT_POWER)
 764                         status |= 1 << USB_PORT_FEAT_POWER;
 765
 766 #ifndef EHCI_VERBOSE_DEBUG
 767         if (status & ~0xffff)   /* only if wPortChange is interesting */
 768 #endif
 769                 dbg_port (ehci, "GetStatus", wIndex + 1, temp);
 770                 put_unaligned(cpu_to_le32 (status), (__le32 *) buf);
 771                 break;
 772         case SetHubFeature:
 773                 switch (wValue) {
 774                 case C_HUB_LOCAL_POWER:
 775                 case C_HUB_OVER_CURRENT:
 776                         /* no hub-wide feature/status flags */
 777                         break;
 778                 default:
 779                         goto error;
 780                 }
 781                 break;
 782         case SetPortFeature:
 783                 selector = wIndex >> 8;
 784                 wIndex &= 0xff;
 785                 if (!wIndex || wIndex > ports)
 786                         goto error;
 787                 wIndex--;
 788                 temp = ehci_readl(ehci, status_reg);
 789                 if (temp & PORT_OWNER)
 790                         break;
 791
 792                 temp &= ~PORT_RWC_BITS;
 793                 switch (wValue) {
 794                 case USB_PORT_FEAT_SUSPEND:
 795                         if (ehci->no_selective_suspend)
 796                                 break;
 797                         if ((temp & PORT_PE) == 0
 798                                         || (temp & PORT_RESET) != 0)
 799                                 goto error;
 800                         if (device_may_wakeup(&hcd->self.root_hub->dev))
 801                                 temp |= PORT_WAKE_BITS;
 802                         ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
 803                         break;
 804                 case USB_PORT_FEAT_POWER:
 805                         if (HCS_PPC (ehci->hcs_params))
 806                                 ehci_writel(ehci, temp | PORT_POWER,
 807                                                 status_reg);
 808                         break;
 809                 case USB_PORT_FEAT_RESET:
 810                         if (temp & PORT_RESUME)
 811                                 goto error;
 812                         /* line status bits may report this as low speed,
 813                          * which can be fine if this root hub has a
 814                          * transaction translator built in.
 815                          */
 816                         if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
 817                                         && !ehci_is_TDI(ehci)
 818                                         && PORT_USB11 (temp)) {
 819                                 ehci_dbg (ehci,
 820                                         "port %d low speed --> companion\n",
 821                                         wIndex + 1);
 822                                 temp |= PORT_OWNER;
 823                         } else {
 824                                 ehci_vdbg (ehci, "port %d reset\n", wIndex + 1);
 825                                 temp |= PORT_RESET;
 826                                 temp &= ~PORT_PE;
 827
 828                                 /*
 829                                  * caller must wait, then call GetPortStatus
 830                                  * usb 2.0 spec says 50 ms resets on root
 831                                  */
 832                                 ehci->reset_done [wIndex] = jiffies
 833                                                 + msecs_to_jiffies (50);
 834                         }
 835                         ehci_writel(ehci, temp, status_reg);
 836                         break;
 837
 838                 /* For downstream facing ports (these):  one hub port is put
 839                  * into test mode according to USB2 11.24.2.13, then the hub
 840                  * must be reset (which for root hub now means rmmod+modprobe,
 841                  * or else system reboot).  See EHCI 2.3.9 and 4.14 for info
 842                  * about the EHCI-specific stuff.
 843                  */
 844                 case USB_PORT_FEAT_TEST:
 845                         if (!selector || selector > 5)
 846                                 goto error;
 847                         ehci_quiesce(ehci);
 848                         ehci_halt(ehci);
 849                         temp |= selector << 16;
 850                         ehci_writel(ehci, temp, status_reg);
 851                         break;
 852
 853                 default:
 854                         goto error;
 855                 }
 856                 ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
 857                 break;
 858
 859         default:
 860 error:
 861                 /* "stall" on error */
 862                 retval = -EPIPE;
 863         }
 864         spin_unlock_irqrestore (&ehci->lock, flags);
 865         return retval;
 866 }