SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/usb/host/ehci-hub.c

   1 /*
   2  * Copyright (C) 2001-2004 by David Brownell
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License as published by the
   6  * Free Software Foundation; either version 2 of the License, or (at your
   7  * option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  11  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software Foundation,
  16  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17  */
  18
  19 /* this file is part of ehci-hcd.c */
  20
  21 /*-------------------------------------------------------------------------*/
  22
  23 /*
  24  * EHCI Root Hub ... the nonsharable stuff
  25  *
  26  * Registers don't need cpu_to_le32, that happens transparently
  27  */
  28
  29 /*-------------------------------------------------------------------------*/
  30
  31 #define PORT_WAKE_BITS  (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
  32
  33 #ifdef  CONFIG_PM
  34
  35 static int ehci_hub_control(
  36         struct usb_hcd  *hcd,
  37         u16             typeReq,
  38         u16             wValue,
  39         u16             wIndex,
  40         char            *buf,
  41         u16             wLength
  42 );
  43
  44 /* After a power loss, ports that were owned by the companion must be
  45  * reset so that the companion can still own them.
  46  */
  47 static void ehci_handover_companion_ports(struct ehci_hcd *ehci)
  48 {
  49         u32 __iomem     *reg;
  50         u32             status;
  51         int             port;
  52         __le32          buf;
  53         struct usb_hcd  *hcd = ehci_to_hcd(ehci);
  54
  55         if (!ehci->owned_ports)
  56                 return;
  57
  58         /* Give the connections some time to appear */
  59         msleep(20);
  60
  61         port = HCS_N_PORTS(ehci->hcs_params);
  62         while (port--) {
  63                 if (test_bit(port, &ehci->owned_ports)) {
  64                         reg = &ehci->regs->port_status[port];
  65                         status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
  66
  67                         /* Port already owned by companion? */
  68                         if (status & PORT_OWNER)
  69                                 clear_bit(port, &ehci->owned_ports);
  70                         else if (test_bit(port, &ehci->companion_ports))
  71                                 ehci_writel(ehci, status & ~PORT_PE, reg);
  72                         else
  73                                 ehci_hub_control(hcd, SetPortFeature,
  74                                                 USB_PORT_FEAT_RESET, port + 1,
  75                                                 NULL, 0);
  76                 }
  77         }
  78
  79         if (!ehci->owned_ports)
  80                 return;
  81         msleep(90);             /* Wait for resets to complete */
  82
  83         port = HCS_N_PORTS(ehci->hcs_params);
  84         while (port--) {
  85                 if (test_bit(port, &ehci->owned_ports)) {
  86                         ehci_hub_control(hcd, GetPortStatus,
  87                                         0, port + 1,
  88                                         (char *) &buf, sizeof(buf));
  89
  90                         /* The companion should now own the port,
  91                          * but if something went wrong the port must not
  92                          * remain enabled.
  93                          */
  94                         reg = &ehci->regs->port_status[port];
  95                         status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
  96                         if (status & PORT_OWNER)
  97                                 ehci_writel(ehci, status | PORT_CSC, reg);
  98                         else {
  99                                 ehci_dbg(ehci, "failed handover port %d: %x\n",
 100                                                 port + 1, status);
 101                                 ehci_writel(ehci, status & ~PORT_PE, reg);
 102                         }
 103                 }
 104         }
 105
 106         ehci->owned_ports = 0;
 107 }
 108
 109 static int ehci_bus_suspend (struct usb_hcd *hcd)
 110 {
 111         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 112         int                     port;
 113         int                     mask;
 114         u32 __iomem             *hostpc_reg = NULL;
 115
 116         ehci_dbg(ehci, "suspend root hub\n");
 117
 118         if (time_before (jiffies, ehci->next_statechange))
 119                 msleep(5);
 120         del_timer_sync(&ehci->watchdog);
 121         del_timer_sync(&ehci->iaa_watchdog);
 122
 123         port = HCS_N_PORTS (ehci->hcs_params);
 124         spin_lock_irq (&ehci->lock);
 125
 126         /* stop schedules, clean any completed work */
 127         if (HC_IS_RUNNING(hcd->state)) {
 128                 ehci_quiesce (ehci);
 129                 hcd->state = HC_STATE_QUIESCING;
 130         }
 131         ehci->command = ehci_readl(ehci, &ehci->regs->command);
 132         ehci_work(ehci);
 133
 134         /* Unlike other USB host controller types, EHCI doesn't have
 135          * any notion of "global" or bus-wide suspend.  The driver has
 136          * to manually suspend all the active unsuspended ports, and
 137          * then manually resume them in the bus_resume() routine.
 138          */
 139         ehci->bus_suspended = 0;
 140         ehci->owned_ports = 0;
 141         while (port--) {
 142                 u32 __iomem     *reg = &ehci->regs->port_status [port];
 143                 u32             t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
 144                 u32             t2 = t1;
 145
 146                 if (ehci->has_hostpc)
 147                         hostpc_reg = (u32 __iomem *)((u8 *)ehci->regs
 148                                 + HOSTPC0 + 4 * (port & 0xff));
 149                 /* keep track of which ports we suspend */
 150                 if (t1 & PORT_OWNER)
 151                         set_bit(port, &ehci->owned_ports);
 152                 else if ((t1 & PORT_PE) && !(t1 & PORT_SUSPEND)) {
 153                         t2 |= PORT_SUSPEND;
 154                         set_bit(port, &ehci->bus_suspended);
 155                 }
 156
 157                 /* enable remote wakeup on all ports */
 158                 if (hcd->self.root_hub->do_remote_wakeup) {
 159                         /* only enable appropriate wake bits, otherwise the
 160                          * hardware can not go phy low power mode. If a race
 161                          * condition happens here(connection change during bits
 162                          * set), the port change detection will finally fix it.
 163                          */
 164                         if (t1 & PORT_CONNECT) {
 165                                 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
 166                                 t2 &= ~PORT_WKCONN_E;
 167                         } else {
 168                                 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
 169                                 t2 &= ~PORT_WKDISC_E;
 170                         }
 171                 } else
 172                         t2 &= ~PORT_WAKE_BITS;
 173
 174                 if (t1 != t2) {
 175                         ehci_vdbg (ehci, "port %d, %08x -> %08x\n",
 176                                 port + 1, t1, t2);
 177                         ehci_writel(ehci, t2, reg);
 178                         if (hostpc_reg) {
 179                                 u32     t3;
 180
 181                                 msleep(5);/* 5ms for HCD enter low pwr mode */
 182                                 t3 = ehci_readl(ehci, hostpc_reg);
 183                                 ehci_writel(ehci, t3 | HOSTPC_PHCD, hostpc_reg);
 184                                 t3 = ehci_readl(ehci, hostpc_reg);
 185                                 ehci_dbg(ehci, "Port%d phy low pwr mode %s\n",
 186                                         port, (t3 & HOSTPC_PHCD) ?
 187                                         "succeeded" : "failed");
 188                         }
 189                 }
 190         }
 191
 192         /* Apparently some devices need a >= 1-uframe delay here */
 193         if (ehci->bus_suspended)
 194                 udelay(150);
 195
 196         /* turn off now-idle HC */
 197         ehci_halt (ehci);
 198         hcd->state = HC_STATE_SUSPENDED;
 199
 200         if (ehci->reclaim)
 201                 end_unlink_async(ehci);
 202
 203         /* allow remote wakeup */
 204         mask = INTR_MASK;
 205         if (!hcd->self.root_hub->do_remote_wakeup)
 206                 mask &= ~STS_PCD;
 207         ehci_writel(ehci, mask, &ehci->regs->intr_enable);
 208         ehci_readl(ehci, &ehci->regs->intr_enable);
 209
 210         ehci->next_statechange = jiffies + msecs_to_jiffies(10);
 211         spin_unlock_irq (&ehci->lock);
 212         return 0;
 213 }
 214
 215
 216 /* caller has locked the root hub, and should reset/reinit on error */
 217 static int ehci_bus_resume (struct usb_hcd *hcd)
 218 {
 219         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 220         u32                     temp;
 221         u32                     power_okay;
 222         int                     i;
 223         u8                      resume_needed = 0;
 224
 225         if (time_before (jiffies, ehci->next_statechange))
 226                 msleep(5);
 227         spin_lock_irq (&ehci->lock);
 228         if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
 229                 spin_unlock_irq(&ehci->lock);
 230                 return -ESHUTDOWN;
 231         }
 232
 233         /* Ideally and we've got a real resume here, and no port's power
 234          * was lost.  (For PCI, that means Vaux was maintained.)  But we
 235          * could instead be restoring a swsusp snapshot -- so that BIOS was
 236          * the last user of the controller, not reset/pm hardware keeping
 237          * state we gave to it.
 238          */
 239         power_okay = ehci_readl(ehci, &ehci->regs->intr_enable);
 240         ehci_dbg(ehci, "resume root hub%s\n",
 241                         power_okay ? "" : " after power loss");
 242
 243         /* at least some APM implementations will try to deliver
 244          * IRQs right away, so delay them until we're ready.
 245          */
 246         ehci_writel(ehci, 0, &ehci->regs->intr_enable);
 247
 248         /* re-init operational registers */
 249         ehci_writel(ehci, 0, &ehci->regs->segment);
 250         ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
 251         ehci_writel(ehci, (u32) ehci->async->qh_dma, &ehci->regs->async_next);
 252
 253         /* restore CMD_RUN, framelist size, and irq threshold */
 254         ehci_writel(ehci, ehci->command, &ehci->regs->command);
 255
 256         /* Some controller/firmware combinations need a delay during which
 257          * they set up the port statuses.  See Bugzilla #8190. */
 258         spin_unlock_irq(&ehci->lock);
 259         msleep(8);
 260         spin_lock_irq(&ehci->lock);
 261
 262         /* manually resume the ports we suspended during bus_suspend() */
 263         i = HCS_N_PORTS (ehci->hcs_params);
 264         while (i--) {
 265                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 266                 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
 267                 if (test_bit(i, &ehci->bus_suspended) &&
 268                                 (temp & PORT_SUSPEND)) {
 269                         temp |= PORT_RESUME;
 270                         resume_needed = 1;
 271                 }
 272                 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
 273         }
 274
 275         /* msleep for 20ms only if code is trying to resume port */
 276         if (resume_needed) {
 277                 spin_unlock_irq(&ehci->lock);
 278                 msleep(20);
 279                 spin_lock_irq(&ehci->lock);
 280         }
 281
 282         i = HCS_N_PORTS (ehci->hcs_params);
 283         while (i--) {
 284                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 285                 if (test_bit(i, &ehci->bus_suspended) &&
 286                                 (temp & PORT_SUSPEND)) {
 287                         temp &= ~(PORT_RWC_BITS | PORT_RESUME);
 288                         ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
 289                         ehci_vdbg (ehci, "resumed port %d\n", i + 1);
 290                 }
 291         }
 292         (void) ehci_readl(ehci, &ehci->regs->command);
 293
 294         /* maybe re-activate the schedule(s) */
 295         temp = 0;
 296         if (ehci->async->qh_next.qh)
 297                 temp |= CMD_ASE;
 298         if (ehci->periodic_sched)
 299                 temp |= CMD_PSE;
 300         if (temp) {
 301                 ehci->command |= temp;
 302                 ehci_writel(ehci, ehci->command, &ehci->regs->command);
 303         }
 304
 305         ehci->next_statechange = jiffies + msecs_to_jiffies(5);
 306         hcd->state = HC_STATE_RUNNING;
 307
 308         /* Now we can safely re-enable irqs */
 309         ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
 310
 311         spin_unlock_irq (&ehci->lock);
 312         ehci_handover_companion_ports(ehci);
 313         return 0;
 314 }
 315
 316 #else
 317
 318 #define ehci_bus_suspend        NULL
 319 #define ehci_bus_resume         NULL
 320
 321 #endif  /* CONFIG_PM */
 322
 323 /*-------------------------------------------------------------------------*/
 324
 325 /* Display the ports dedicated to the companion controller */
 326 static ssize_t show_companion(struct device *dev,
 327                               struct device_attribute *attr,
 328                               char *buf)
 329 {
 330         struct ehci_hcd         *ehci;
 331         int                     nports, index, n;
 332         int                     count = PAGE_SIZE;
 333         char                    *ptr = buf;
 334
 335         ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
 336         nports = HCS_N_PORTS(ehci->hcs_params);
 337
 338         for (index = 0; index < nports; ++index) {
 339                 if (test_bit(index, &ehci->companion_ports)) {
 340                         n = scnprintf(ptr, count, "%d\n", index + 1);
 341                         ptr += n;
 342                         count -= n;
 343                 }
 344         }
 345         return ptr - buf;
 346 }
 347
 348 /*
 349  * Sets the owner of a port
 350  */
 351 static void set_owner(struct ehci_hcd *ehci, int portnum, int new_owner)
 352 {
 353         u32 __iomem             *status_reg;
 354         u32                     port_status;
 355         int                     try;
 356
 357         status_reg = &ehci->regs->port_status[portnum];
 358
 359         /*
 360          * The controller won't set the OWNER bit if the port is
 361          * enabled, so this loop will sometimes require at least two
 362          * iterations: one to disable the port and one to set OWNER.
 363          */
 364         for (try = 4; try > 0; --try) {
 365                 spin_lock_irq(&ehci->lock);
 366                 port_status = ehci_readl(ehci, status_reg);
 367                 if ((port_status & PORT_OWNER) == new_owner
 368                                 || (port_status & (PORT_OWNER | PORT_CONNECT))
 369                                         == 0)
 370                         try = 0;
 371                 else {
 372                         port_status ^= PORT_OWNER;
 373                         port_status &= ~(PORT_PE | PORT_RWC_BITS);
 374                         ehci_writel(ehci, port_status, status_reg);
 375                 }
 376                 spin_unlock_irq(&ehci->lock);
 377                 if (try > 1)
 378                         msleep(5);
 379         }
 380 }
 381
 382 /*
 383  * Dedicate or undedicate a port to the companion controller.
 384  * Syntax is "[-]portnum", where a leading '-' sign means
 385  * return control of the port to the EHCI controller.
 386  */
 387 static ssize_t store_companion(struct device *dev,
 388                                struct device_attribute *attr,
 389                                const char *buf, size_t count)
 390 {
 391         struct ehci_hcd         *ehci;
 392         int                     portnum, new_owner;
 393
 394         ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
 395         new_owner = PORT_OWNER;         /* Owned by companion */
 396         if (sscanf(buf, "%d", &portnum) != 1)
 397                 return -EINVAL;
 398         if (portnum < 0) {
 399                 portnum = - portnum;
 400                 new_owner = 0;          /* Owned by EHCI */
 401         }
 402         if (portnum <= 0 || portnum > HCS_N_PORTS(ehci->hcs_params))
 403                 return -ENOENT;
 404         portnum--;
 405         if (new_owner)
 406                 set_bit(portnum, &ehci->companion_ports);
 407         else
 408                 clear_bit(portnum, &ehci->companion_ports);
 409         set_owner(ehci, portnum, new_owner);
 410         return count;
 411 }
 412 static DEVICE_ATTR(companion, 0644, show_companion, store_companion);
 413
 414 static inline void create_companion_file(struct ehci_hcd *ehci)
 415 {
 416         int     i;
 417
 418         /* with integrated TT there is no companion! */
 419         if (!ehci_is_TDI(ehci))
 420                 i = device_create_file(ehci_to_hcd(ehci)->self.controller,
 421                                        &dev_attr_companion);
 422 }
 423
 424 static inline void remove_companion_file(struct ehci_hcd *ehci)
 425 {
 426         /* with integrated TT there is no companion! */
 427         if (!ehci_is_TDI(ehci))
 428                 device_remove_file(ehci_to_hcd(ehci)->self.controller,
 429                                    &dev_attr_companion);
 430 }
 431
 432
 433 /*-------------------------------------------------------------------------*/
 434
 435 static int check_reset_complete (
 436         struct ehci_hcd *ehci,
 437         int             index,
 438         u32 __iomem     *status_reg,
 439         int             port_status
 440 ) {
 441         if (!(port_status & PORT_CONNECT))
 442                 return port_status;
 443
 444         /* if reset finished and it's still not enabled -- handoff */
 445         if (!(port_status & PORT_PE)) {
 446
 447                 /* with integrated TT, there's nobody to hand it to! */
 448                 if (ehci_is_TDI(ehci)) {
 449                         ehci_dbg (ehci,
 450                                 "Failed to enable port %d on root hub TT\n",
 451                                 index+1);
 452                         return port_status;
 453                 }
 454
 455                 ehci_dbg (ehci, "port %d full speed --> companion\n",
 456                         index + 1);
 457
 458                 // what happens if HCS_N_CC(params) == 0 ?
 459                 port_status |= PORT_OWNER;
 460                 port_status &= ~PORT_RWC_BITS;
 461                 ehci_writel(ehci, port_status, status_reg);
 462
 463                 /* ensure 440EPX ohci controller state is operational */
 464                 if (ehci->has_amcc_usb23)
 465                         set_ohci_hcfs(ehci, 1);
 466         } else {
 467                 ehci_dbg (ehci, "port %d high speed\n", index + 1);
 468                 /* ensure 440EPx ohci controller state is suspended */
 469                 if (ehci->has_amcc_usb23)
 470                         set_ohci_hcfs(ehci, 0);
 471         }
 472
 473         return port_status;
 474 }
 475
 476 /*-------------------------------------------------------------------------*/
 477
 478
 479 /* build "status change" packet (one or two bytes) from HC registers */
 480
 481 static int
 482 ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
 483 {
 484         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 485         u32             temp, status = 0;
 486         u32             mask;
 487         int             ports, i, retval = 1;
 488         unsigned long   flags;
 489
 490         /* if !USB_SUSPEND, root hub timers won't get shut down ... */
 491         if (!HC_IS_RUNNING(hcd->state))
 492                 return 0;
 493
 494         /* init status to no-changes */
 495         buf [0] = 0;
 496         ports = HCS_N_PORTS (ehci->hcs_params);
 497         if (ports > 7) {
 498                 buf [1] = 0;
 499                 retval++;
 500         }
 501
 502         /* Some boards (mostly VIA?) report bogus overcurrent indications,
 503          * causing massive log spam unless we completely ignore them.  It
 504          * may be relevant that VIA VT8235 controllers, where PORT_POWER is
 505          * always set, seem to clear PORT_OCC and PORT_CSC when writing to
 506          * PORT_POWER; that's surprising, but maybe within-spec.
 507          */
 508         if (!ignore_oc)
 509                 mask = PORT_CSC | PORT_PEC | PORT_OCC;
 510         else
 511                 mask = PORT_CSC | PORT_PEC;
 512         // PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
 513
 514         /* no hub change reports (bit 0) for now (power, ...) */
 515
 516         /* port N changes (bit N)? */
 517         spin_lock_irqsave (&ehci->lock, flags);
 518         for (i = 0; i < ports; i++) {
 519                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 520
 521                 /*
 522                  * Return status information even for ports with OWNER set.
 523                  * Otherwise khubd wouldn't see the disconnect event when a
 524                  * high-speed device is switched over to the companion
 525                  * controller by the user.
 526                  */
 527
 528                 if ((temp & mask) != 0 || test_bit(i, &ehci->port_c_suspend)
 529                                 || (ehci->reset_done[i] && time_after_eq(
 530                                         jiffies, ehci->reset_done[i]))) {
 531                         if (i < 7)
 532                             buf [0] |= 1 << (i + 1);
 533                         else
 534                             buf [1] |= 1 << (i - 7);
 535                         status = STS_PCD;
 536                 }
 537         }
 538         /* FIXME autosuspend idle root hubs */
 539         spin_unlock_irqrestore (&ehci->lock, flags);
 540         return status ? retval : 0;
 541 }
 542
 543 /*-------------------------------------------------------------------------*/
 544
 545 static void
 546 ehci_hub_descriptor (
 547         struct ehci_hcd                 *ehci,
 548         struct usb_hub_descriptor       *desc
 549 ) {
 550         int             ports = HCS_N_PORTS (ehci->hcs_params);
 551         u16             temp;
 552
 553         desc->bDescriptorType = 0x29;
 554         desc->bPwrOn2PwrGood = 10;      /* ehci 1.0, 2.3.9 says 20ms max */
 555         desc->bHubContrCurrent = 0;
 556
 557         desc->bNbrPorts = ports;
 558         temp = 1 + (ports / 8);
 559         desc->bDescLength = 7 + 2 * temp;
 560
 561         /* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
 562         memset (&desc->bitmap [0], 0, temp);
 563         memset (&desc->bitmap [temp], 0xff, temp);
 564
 565         temp = 0x0008;                  /* per-port overcurrent reporting */
 566         if (HCS_PPC (ehci->hcs_params))
 567                 temp |= 0x0001;         /* per-port power control */
 568         else
 569                 temp |= 0x0002;         /* no power switching */
 570 #if 0
 571 // re-enable when we support USB_PORT_FEAT_INDICATOR below.
 572         if (HCS_INDICATOR (ehci->hcs_params))
 573                 temp |= 0x0080;         /* per-port indicators (LEDs) */
 574 #endif
 575         desc->wHubCharacteristics = cpu_to_le16(temp);
 576 }
 577
 578 /*-------------------------------------------------------------------------*/
 579
 580 static int ehci_hub_control (
 581         struct usb_hcd  *hcd,
 582         u16             typeReq,
 583         u16             wValue,
 584         u16             wIndex,
 585         char            *buf,
 586         u16             wLength
 587 ) {
 588         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 589         int             ports = HCS_N_PORTS (ehci->hcs_params);
 590         u32 __iomem     *status_reg = &ehci->regs->port_status[
 591                                 (wIndex & 0xff) - 1];
 592         u32 __iomem     *hostpc_reg = NULL;
 593         u32             temp, temp1, status;
 594         unsigned long   flags;
 595         int             retval = 0;
 596         unsigned        selector;
 597
 598         /*
 599          * FIXME:  support SetPortFeatures USB_PORT_FEAT_INDICATOR.
 600          * HCS_INDICATOR may say we can change LEDs to off/amber/green.
 601          * (track current state ourselves) ... blink for diagnostics,
 602          * power, "this is the one", etc.  EHCI spec supports this.
 603          */
 604
 605         if (ehci->has_hostpc)
 606                 hostpc_reg = (u32 __iomem *)((u8 *)ehci->regs
 607                                 + HOSTPC0 + 4 * ((wIndex & 0xff) - 1));
 608         spin_lock_irqsave (&ehci->lock, flags);
 609         switch (typeReq) {
 610         case ClearHubFeature:
 611                 switch (wValue) {
 612                 case C_HUB_LOCAL_POWER:
 613                 case C_HUB_OVER_CURRENT:
 614                         /* no hub-wide feature/status flags */
 615                         break;
 616                 default:
 617                         goto error;
 618                 }
 619                 break;
 620         case ClearPortFeature:
 621                 if (!wIndex || wIndex > ports)
 622                         goto error;
 623                 wIndex--;
 624                 temp = ehci_readl(ehci, status_reg);
 625
 626                 /*
 627                  * Even if OWNER is set, so the port is owned by the
 628                  * companion controller, khubd needs to be able to clear
 629                  * the port-change status bits (especially
 630                  * USB_PORT_FEAT_C_CONNECTION).
 631                  */
 632
 633                 switch (wValue) {
 634                 case USB_PORT_FEAT_ENABLE:
 635                         ehci_writel(ehci, temp & ~PORT_PE, status_reg);
 636                         break;
 637                 case USB_PORT_FEAT_C_ENABLE:
 638                         ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_PEC,
 639                                         status_reg);
 640                         break;
 641                 case USB_PORT_FEAT_SUSPEND:
 642                         if (temp & PORT_RESET)
 643                                 goto error;
 644                         if (ehci->no_selective_suspend)
 645                                 break;
 646                         if (temp & PORT_SUSPEND) {
 647                                 if ((temp & PORT_PE) == 0)
 648                                         goto error;
 649                                 /* resume signaling for 20 msec */
 650                                 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
 651                                 ehci_writel(ehci, temp | PORT_RESUME,
 652                                                 status_reg);
 653                                 ehci->reset_done [wIndex] = jiffies
 654                                                 + msecs_to_jiffies (20);
 655                         }
 656                         break;
 657                 case USB_PORT_FEAT_C_SUSPEND:
 658                         clear_bit(wIndex, &ehci->port_c_suspend);
 659                         break;
 660                 case USB_PORT_FEAT_POWER:
 661                         if (HCS_PPC (ehci->hcs_params))
 662                                 ehci_writel(ehci,
 663                                           temp & ~(PORT_RWC_BITS | PORT_POWER),
 664                                           status_reg);
 665                         break;
 666                 case USB_PORT_FEAT_C_CONNECTION:
 667                         ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_CSC,
 668                                         status_reg);
 669                         break;
 670                 case USB_PORT_FEAT_C_OVER_CURRENT:
 671                         ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_OCC,
 672                                         status_reg);
 673                         break;
 674                 case USB_PORT_FEAT_C_RESET:
 675                         /* GetPortStatus clears reset */
 676                         break;
 677                 default:
 678                         goto error;
 679                 }
 680                 ehci_readl(ehci, &ehci->regs->command); /* unblock posted write */
 681                 break;
 682         case GetHubDescriptor:
 683                 ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
 684                         buf);
 685                 break;
 686         case GetHubStatus:
 687                 /* no hub-wide feature/status flags */
 688                 memset (buf, 0, 4);
 689                 //cpu_to_le32s ((u32 *) buf);
 690                 break;
 691         case GetPortStatus:
 692                 if (!wIndex || wIndex > ports)
 693                         goto error;
 694                 wIndex--;
 695                 status = 0;
 696                 temp = ehci_readl(ehci, status_reg);
 697
 698                 // wPortChange bits
 699                 if (temp & PORT_CSC)
 700                         status |= 1 << USB_PORT_FEAT_C_CONNECTION;
 701                 if (temp & PORT_PEC)
 702                         status |= 1 << USB_PORT_FEAT_C_ENABLE;
 703
 704                 if ((temp & PORT_OCC) && !ignore_oc){
 705                         status |= 1 << USB_PORT_FEAT_C_OVER_CURRENT;
 706
 707                         /*
 708                          * Hubs should disable port power on over-current.
 709                          * However, not all EHCI implementations do this
 710                          * automatically, even if they _do_ support per-port
 711                          * power switching; they're allowed to just limit the
 712                          * current.  khubd will turn the power back on.
 713                          */
 714                         if (HCS_PPC (ehci->hcs_params)){
 715                                 ehci_writel(ehci,
 716                                         temp & ~(PORT_RWC_BITS | PORT_POWER),
 717                                         status_reg);
 718                         }
 719                 }
 720
 721                 /* whoever resumes must GetPortStatus to complete it!! */
 722                 if (temp & PORT_RESUME) {
 723
 724                         /* Remote Wakeup received? */
 725                         if (!ehci->reset_done[wIndex]) {
 726                                 /* resume signaling for 20 msec */
 727                                 ehci->reset_done[wIndex] = jiffies
 728                                                 + msecs_to_jiffies(20);
 729                                 /* check the port again */
 730                                 mod_timer(&ehci_to_hcd(ehci)->rh_timer,
 731                                                 ehci->reset_done[wIndex]);
 732                         }
 733
 734                         /* resume completed? */
 735                         else if (time_after_eq(jiffies,
 736                                         ehci->reset_done[wIndex])) {
 737                                 clear_bit(wIndex, &ehci->suspended_ports);
 738                                 set_bit(wIndex, &ehci->port_c_suspend);
 739                                 ehci->reset_done[wIndex] = 0;
 740
 741                                 /* stop resume signaling */
 742                                 temp = ehci_readl(ehci, status_reg);
 743                                 ehci_writel(ehci,
 744                                         temp & ~(PORT_RWC_BITS | PORT_RESUME),
 745                                         status_reg);
 746                                 retval = handshake(ehci, status_reg,
 747                                            PORT_RESUME, 0, 2000 /* 2msec */);
 748                                 if (retval != 0) {
 749                                         ehci_err(ehci,
 750                                                 "port %d resume error %d\n",
 751                                                 wIndex + 1, retval);
 752                                         goto error;
 753                                 }
 754                                 temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10));
 755                         }
 756                 }
 757
 758                 /* whoever resets must GetPortStatus to complete it!! */
 759                 if ((temp & PORT_RESET)
 760                                 && time_after_eq(jiffies,
 761                                         ehci->reset_done[wIndex])) {
 762                         status |= 1 << USB_PORT_FEAT_C_RESET;
 763                         ehci->reset_done [wIndex] = 0;
 764
 765                         /* force reset to complete */
 766                         ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESET),
 767                                         status_reg);
 768                         /* REVISIT:  some hardware needs 550+ usec to clear
 769                          * this bit; seems too long to spin routinely...
 770                          */
 771                         retval = handshake(ehci, status_reg,
 772                                         PORT_RESET, 0, 750);
 773                         if (retval != 0) {
 774                                 ehci_err (ehci, "port %d reset error %d\n",
 775                                         wIndex + 1, retval);
 776                                 goto error;
 777                         }
 778
 779                         /* see what we found out */
 780                         temp = check_reset_complete (ehci, wIndex, status_reg,
 781                                         ehci_readl(ehci, status_reg));
 782                 }
 783
 784                 if (!(temp & (PORT_RESUME|PORT_RESET)))
 785                         ehci->reset_done[wIndex] = 0;
 786
 787                 /* transfer dedicated ports to the companion hc */
 788                 if ((temp & PORT_CONNECT) &&
 789                                 test_bit(wIndex, &ehci->companion_ports)) {
 790                         temp &= ~PORT_RWC_BITS;
 791                         temp |= PORT_OWNER;
 792                         ehci_writel(ehci, temp, status_reg);
 793                         ehci_dbg(ehci, "port %d --> companion\n", wIndex + 1);
 794                         temp = ehci_readl(ehci, status_reg);
 795                 }
 796
 797                 /*
 798                  * Even if OWNER is set, there's no harm letting khubd
 799                  * see the wPortStatus values (they should all be 0 except
 800                  * for PORT_POWER anyway).
 801                  */
 802
 803                 if (temp & PORT_CONNECT) {
 804                         status |= 1 << USB_PORT_FEAT_CONNECTION;
 805                         // status may be from integrated TT
 806                         if (ehci->has_hostpc) {
 807                                 temp1 = ehci_readl(ehci, hostpc_reg);
 808                                 status |= ehci_port_speed(ehci, temp1);
 809                         } else
 810                                 status |= ehci_port_speed(ehci, temp);
 811                 }
 812                 if (temp & PORT_PE)
 813                         status |= 1 << USB_PORT_FEAT_ENABLE;
 814
 815                 /* maybe the port was unsuspended without our knowledge */
 816                 if (temp & (PORT_SUSPEND|PORT_RESUME)) {
 817                         status |= 1 << USB_PORT_FEAT_SUSPEND;
 818                 } else if (test_bit(wIndex, &ehci->suspended_ports)) {
 819                         clear_bit(wIndex, &ehci->suspended_ports);
 820                         ehci->reset_done[wIndex] = 0;
 821                         if (temp & PORT_PE)
 822                                 set_bit(wIndex, &ehci->port_c_suspend);
 823                 }
 824
 825                 if (temp & PORT_OC)
 826                         status |= 1 << USB_PORT_FEAT_OVER_CURRENT;
 827                 if (temp & PORT_RESET)
 828                         status |= 1 << USB_PORT_FEAT_RESET;
 829                 if (temp & PORT_POWER)
 830                         status |= 1 << USB_PORT_FEAT_POWER;
 831                 if (test_bit(wIndex, &ehci->port_c_suspend))
 832                         status |= 1 << USB_PORT_FEAT_C_SUSPEND;
 833
 834 #ifndef VERBOSE_DEBUG
 835         if (status & ~0xffff)   /* only if wPortChange is interesting */
 836 #endif
 837                 dbg_port (ehci, "GetStatus", wIndex + 1, temp);
 838                 put_unaligned_le32(status, buf);
 839                 break;
 840         case SetHubFeature:
 841                 switch (wValue) {
 842                 case C_HUB_LOCAL_POWER:
 843                 case C_HUB_OVER_CURRENT:
 844                         /* no hub-wide feature/status flags */
 845                         break;
 846                 default:
 847                         goto error;
 848                 }
 849                 break;
 850         case SetPortFeature:
 851                 selector = wIndex >> 8;
 852                 wIndex &= 0xff;
 853                 if (!wIndex || wIndex > ports)
 854                         goto error;
 855                 wIndex--;
 856                 temp = ehci_readl(ehci, status_reg);
 857                 if (temp & PORT_OWNER)
 858                         break;
 859
 860                 temp &= ~PORT_RWC_BITS;
 861                 switch (wValue) {
 862                 case USB_PORT_FEAT_SUSPEND:
 863                         if (ehci->no_selective_suspend)
 864                                 break;
 865                         if ((temp & PORT_PE) == 0
 866                                         || (temp & PORT_RESET) != 0)
 867                                 goto error;
 868                         ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
 869                         /* After above check the port must be connected.
 870                          * Set appropriate bit thus could put phy into low power
 871                          * mode if we have hostpc feature
 872                          */
 873                         if (hostpc_reg) {
 874                                 temp &= ~PORT_WKCONN_E;
 875                                 temp |= (PORT_WKDISC_E | PORT_WKOC_E);
 876                                 ehci_writel(ehci, temp | PORT_SUSPEND,
 877                                                         status_reg);
 878                                 msleep(5);/* 5ms for HCD enter low pwr mode */
 879                                 temp1 = ehci_readl(ehci, hostpc_reg);
 880                                 ehci_writel(ehci, temp1 | HOSTPC_PHCD,
 881                                         hostpc_reg);
 882                                 temp1 = ehci_readl(ehci, hostpc_reg);
 883                                 ehci_dbg(ehci, "Port%d phy low pwr mode %s\n",
 884                                         wIndex, (temp1 & HOSTPC_PHCD) ?
 885                                         "succeeded" : "failed");
 886                         }
 887                         set_bit(wIndex, &ehci->suspended_ports);
 888                         break;
 889                 case USB_PORT_FEAT_POWER:
 890                         if (HCS_PPC (ehci->hcs_params))
 891                                 ehci_writel(ehci, temp | PORT_POWER,
 892                                                 status_reg);
 893                         break;
 894                 case USB_PORT_FEAT_RESET:
 895                         if (temp & PORT_RESUME)
 896                                 goto error;
 897                         /* line status bits may report this as low speed,
 898                          * which can be fine if this root hub has a
 899                          * transaction translator built in.
 900                          */
 901                         if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
 902                                         && !ehci_is_TDI(ehci)
 903                                         && PORT_USB11 (temp)) {
 904                                 ehci_dbg (ehci,
 905                                         "port %d low speed --> companion\n",
 906                                         wIndex + 1);
 907                                 temp |= PORT_OWNER;
 908                         } else {
 909                                 ehci_vdbg (ehci, "port %d reset\n", wIndex + 1);
 910                                 temp |= PORT_RESET;
 911                                 temp &= ~PORT_PE;
 912
 913                                 /*
 914                                  * caller must wait, then call GetPortStatus
 915                                  * usb 2.0 spec says 50 ms resets on root
 916                                  */
 917                                 ehci->reset_done [wIndex] = jiffies
 918                                                 + msecs_to_jiffies (50);
 919                         }
 920                         ehci_writel(ehci, temp, status_reg);
 921                         break;
 922
 923                 /* For downstream facing ports (these):  one hub port is put
 924                  * into test mode according to USB2 11.24.2.13, then the hub
 925                  * must be reset (which for root hub now means rmmod+modprobe,
 926                  * or else system reboot).  See EHCI 2.3.9 and 4.14 for info
 927                  * about the EHCI-specific stuff.
 928                  */
 929                 case USB_PORT_FEAT_TEST:
 930                         if (!selector || selector > 5)
 931                                 goto error;
 932                         ehci_quiesce(ehci);
 933                         ehci_halt(ehci);
 934                         temp |= selector << 16;
 935                         ehci_writel(ehci, temp, status_reg);
 936                         break;
 937
 938                 default:
 939                         goto error;
 940                 }
 941                 ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
 942                 break;
 943
 944         default:
 945 error:
 946                 /* "stall" on error */
 947                 retval = -EPIPE;
 948         }
 949         spin_unlock_irqrestore (&ehci->lock, flags);
 950         return retval;
 951 }
 952
 953 static void ehci_relinquish_port(struct usb_hcd *hcd, int portnum)
 954 {
 955         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
 956
 957         if (ehci_is_TDI(ehci))
 958                 return;
 959         set_owner(ehci, --portnum, PORT_OWNER);
 960 }
 961
 962 static int ehci_port_handed_over(struct usb_hcd *hcd, int portnum)
 963 {
 964         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
 965         u32 __iomem             *reg;
 966
 967         if (ehci_is_TDI(ehci))
 968                 return 0;
 969         reg = &ehci->regs->port_status[portnum - 1];
 970         return ehci_readl(ehci, reg) & PORT_OWNER;
 971 }