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 #include <linux/usb/otg.h>
  31
  32 #define PORT_WAKE_BITS  (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
  33
  34 #ifdef  CONFIG_PM
  35
  36 static int ehci_hub_control(
  37         struct usb_hcd  *hcd,
  38         u16             typeReq,
  39         u16             wValue,
  40         u16             wIndex,
  41         char            *buf,
  42         u16             wLength
  43 );
  44
  45 /* After a power loss, ports that were owned by the companion must be
  46  * reset so that the companion can still own them.
  47  */
  48 static void ehci_handover_companion_ports(struct ehci_hcd *ehci)
  49 {
  50         u32 __iomem     *reg;
  51         u32             status;
  52         int             port;
  53         __le32          buf;
  54         struct usb_hcd  *hcd = ehci_to_hcd(ehci);
  55
  56         if (!ehci->owned_ports)
  57                 return;
  58
  59         /* Give the connections some time to appear */
  60         msleep(20);
  61
  62         port = HCS_N_PORTS(ehci->hcs_params);
  63         while (port--) {
  64                 if (test_bit(port, &ehci->owned_ports)) {
  65                         reg = &ehci->regs->port_status[port];
  66                         status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
  67
  68                         /* Port already owned by companion? */
  69                         if (status & PORT_OWNER)
  70                                 clear_bit(port, &ehci->owned_ports);
  71                         else if (test_bit(port, &ehci->companion_ports))
  72                                 ehci_writel(ehci, status & ~PORT_PE, reg);
  73                         else
  74                                 ehci_hub_control(hcd, SetPortFeature,
  75                                                 USB_PORT_FEAT_RESET, port + 1,
  76                                                 NULL, 0);
  77                 }
  78         }
  79
  80         if (!ehci->owned_ports)
  81                 return;
  82         msleep(90);             /* Wait for resets to complete */
  83
  84         port = HCS_N_PORTS(ehci->hcs_params);
  85         while (port--) {
  86                 if (test_bit(port, &ehci->owned_ports)) {
  87                         ehci_hub_control(hcd, GetPortStatus,
  88                                         0, port + 1,
  89                                         (char *) &buf, sizeof(buf));
  90
  91                         /* The companion should now own the port,
  92                          * but if something went wrong the port must not
  93                          * remain enabled.
  94                          */
  95                         reg = &ehci->regs->port_status[port];
  96                         status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
  97                         if (status & PORT_OWNER)
  98                                 ehci_writel(ehci, status | PORT_CSC, reg);
  99                         else {
 100                                 ehci_dbg(ehci, "failed handover port %d: %x\n",
 101                                                 port + 1, status);
 102                                 ehci_writel(ehci, status & ~PORT_PE, reg);
 103                         }
 104                 }
 105         }
 106
 107         ehci->owned_ports = 0;
 108 }
 109
 110 static int ehci_port_change(struct ehci_hcd *ehci)
 111 {
 112         int i = HCS_N_PORTS(ehci->hcs_params);
 113
 114         /* First check if the controller indicates a change event */
 115
 116         if (ehci_readl(ehci, &ehci->regs->status) & STS_PCD)
 117                 return 1;
 118
 119         /*
 120          * Not all controllers appear to update this while going from D3 to D0,
 121          * so check the individual port status registers as well
 122          */
 123
 124         while (i--)
 125                 if (ehci_readl(ehci, &ehci->regs->port_status[i]) & PORT_CSC)
 126                         return 1;
 127
 128         return 0;
 129 }
 130
 131 static __maybe_unused void ehci_adjust_port_wakeup_flags(struct ehci_hcd *ehci,
 132                 bool suspending, bool do_wakeup)
 133 {
 134         int             port;
 135         u32             temp;
 136         unsigned long   flags;
 137
 138         /* If remote wakeup is enabled for the root hub but disabled
 139          * for the controller, we must adjust all the port wakeup flags
 140          * when the controller is suspended or resumed.  In all other
 141          * cases they don't need to be changed.
 142          */
 143         if (!ehci_to_hcd(ehci)->self.root_hub->do_remote_wakeup || do_wakeup)
 144                 return;
 145
 146         spin_lock_irqsave(&ehci->lock, flags);
 147
 148         /* clear phy low-power mode before changing wakeup flags */
 149         if (ehci->has_hostpc) {
 150                 port = HCS_N_PORTS(ehci->hcs_params);
 151                 while (port--) {
 152                         u32 __iomem     *hostpc_reg;
 153
 154                         hostpc_reg = (u32 __iomem *)((u8 *) ehci->regs
 155                                         + HOSTPC0 + 4 * port);
 156                         temp = ehci_readl(ehci, hostpc_reg);
 157                         ehci_writel(ehci, temp & ~HOSTPC_PHCD, hostpc_reg);
 158                 }
 159                 spin_unlock_irqrestore(&ehci->lock, flags);
 160                 msleep(5);
 161                 spin_lock_irqsave(&ehci->lock, flags);
 162         }
 163
 164         port = HCS_N_PORTS(ehci->hcs_params);
 165         while (port--) {
 166                 u32 __iomem     *reg = &ehci->regs->port_status[port];
 167                 u32             t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
 168                 u32             t2 = t1 & ~PORT_WAKE_BITS;
 169
 170                 /* If we are suspending the controller, clear the flags.
 171                  * If we are resuming the controller, set the wakeup flags.
 172                  */
 173                 if (!suspending) {
 174                         if (t1 & PORT_CONNECT)
 175                                 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
 176                         else
 177                                 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
 178                 }
 179                 ehci_vdbg(ehci, "port %d, %08x -> %08x\n",
 180                                 port + 1, t1, t2);
 181                 ehci_writel(ehci, t2, reg);
 182         }
 183
 184         /* enter phy low-power mode again */
 185         if (ehci->has_hostpc) {
 186                 port = HCS_N_PORTS(ehci->hcs_params);
 187                 while (port--) {
 188                         u32 __iomem     *hostpc_reg;
 189
 190                         hostpc_reg = (u32 __iomem *)((u8 *) ehci->regs
 191                                         + HOSTPC0 + 4 * port);
 192                         temp = ehci_readl(ehci, hostpc_reg);
 193                         ehci_writel(ehci, temp | HOSTPC_PHCD, hostpc_reg);
 194                 }
 195         }
 196
 197         /* Does the root hub have a port wakeup pending? */
 198         if (!suspending && ehci_port_change(ehci))
 199                 usb_hcd_resume_root_hub(ehci_to_hcd(ehci));
 200
 201         spin_unlock_irqrestore(&ehci->lock, flags);
 202 }
 203
 204 static int ehci_bus_suspend (struct usb_hcd *hcd)
 205 {
 206         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 207         int                     port;
 208         int                     mask;
 209         int                     changed;
 210
 211         ehci_dbg(ehci, "suspend root hub\n");
 212
 213         if (time_before (jiffies, ehci->next_statechange))
 214                 msleep(5);
 215         del_timer_sync(&ehci->watchdog);
 216         del_timer_sync(&ehci->iaa_watchdog);
 217
 218         spin_lock_irq (&ehci->lock);
 219
 220         /* Once the controller is stopped, port resumes that are already
 221          * in progress won't complete.  Hence if remote wakeup is enabled
 222          * for the root hub and any ports are in the middle of a resume or
 223          * remote wakeup, we must fail the suspend.
 224          */
 225         if (hcd->self.root_hub->do_remote_wakeup) {
 226                 port = HCS_N_PORTS(ehci->hcs_params);
 227                 while (port--) {
 228                         if (ehci->reset_done[port] != 0) {
 229                                 spin_unlock_irq(&ehci->lock);
 230                                 ehci_dbg(ehci, "suspend failed because "
 231                                                 "port %d is resuming\n",
 232                                                 port + 1);
 233                                 return -EBUSY;
 234                         }
 235                 }
 236         }
 237
 238         /* stop schedules, clean any completed work */
 239         if (HC_IS_RUNNING(hcd->state)) {
 240                 ehci_quiesce (ehci);
 241                 hcd->state = HC_STATE_QUIESCING;
 242         }
 243         ehci->command = ehci_readl(ehci, &ehci->regs->command);
 244         ehci_work(ehci);
 245
 246         /* Unlike other USB host controller types, EHCI doesn't have
 247          * any notion of "global" or bus-wide suspend.  The driver has
 248          * to manually suspend all the active unsuspended ports, and
 249          * then manually resume them in the bus_resume() routine.
 250          */
 251         ehci->bus_suspended = 0;
 252         ehci->owned_ports = 0;
 253         changed = 0;
 254         port = HCS_N_PORTS(ehci->hcs_params);
 255         while (port--) {
 256                 u32 __iomem     *reg = &ehci->regs->port_status [port];
 257                 u32             t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
 258                 u32             t2 = t1 & ~PORT_WAKE_BITS;
 259
 260                 /* keep track of which ports we suspend */
 261                 if (t1 & PORT_OWNER)
 262                         set_bit(port, &ehci->owned_ports);
 263                 else if ((t1 & PORT_PE) && !(t1 & PORT_SUSPEND)) {
 264                         t2 |= PORT_SUSPEND;
 265                         set_bit(port, &ehci->bus_suspended);
 266                 }
 267
 268                 /* enable remote wakeup on all ports, if told to do so */
 269                 if (hcd->self.root_hub->do_remote_wakeup) {
 270                         /* only enable appropriate wake bits, otherwise the
 271                          * hardware can not go phy low power mode. If a race
 272                          * condition happens here(connection change during bits
 273                          * set), the port change detection will finally fix it.
 274                          */
 275                         if (t1 & PORT_CONNECT)
 276                                 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
 277                         else
 278                                 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
 279                 }
 280
 281                 if (t1 != t2) {
 282                         ehci_vdbg (ehci, "port %d, %08x -> %08x\n",
 283                                 port + 1, t1, t2);
 284                         ehci_writel(ehci, t2, reg);
 285                         changed = 1;
 286                 }
 287         }
 288
 289         if (changed && ehci->has_hostpc) {
 290                 spin_unlock_irq(&ehci->lock);
 291                 msleep(5);      /* 5 ms for HCD to enter low-power mode */
 292                 spin_lock_irq(&ehci->lock);
 293
 294                 port = HCS_N_PORTS(ehci->hcs_params);
 295                 while (port--) {
 296                         u32 __iomem     *hostpc_reg;
 297                         u32             t3;
 298
 299                         hostpc_reg = (u32 __iomem *)((u8 *) ehci->regs
 300                                         + HOSTPC0 + 4 * port);
 301                         t3 = ehci_readl(ehci, hostpc_reg);
 302                         ehci_writel(ehci, t3 | HOSTPC_PHCD, hostpc_reg);
 303                         t3 = ehci_readl(ehci, hostpc_reg);
 304                         ehci_dbg(ehci, "Port %d phy low-power mode %s\n",
 305                                         port, (t3 & HOSTPC_PHCD) ?
 306                                         "succeeded" : "failed");
 307                 }
 308         }
 309
 310         /* Apparently some devices need a >= 1-uframe delay here */
 311         if (ehci->bus_suspended)
 312                 udelay(150);
 313
 314         /* turn off now-idle HC */
 315         ehci_halt (ehci);
 316         hcd->state = HC_STATE_SUSPENDED;
 317
 318         if (ehci->reclaim)
 319                 end_unlink_async(ehci);
 320
 321         /* allow remote wakeup */
 322         mask = INTR_MASK;
 323         if (!hcd->self.root_hub->do_remote_wakeup)
 324                 mask &= ~STS_PCD;
 325         ehci_writel(ehci, mask, &ehci->regs->intr_enable);
 326         ehci_readl(ehci, &ehci->regs->intr_enable);
 327
 328         ehci->next_statechange = jiffies + msecs_to_jiffies(10);
 329         spin_unlock_irq (&ehci->lock);
 330
 331         /* ehci_work() may have re-enabled the watchdog timer, which we do not
 332          * want, and so we must delete any pending watchdog timer events.
 333          */
 334         del_timer_sync(&ehci->watchdog);
 335         return 0;
 336 }
 337
 338
 339 /* caller has locked the root hub, and should reset/reinit on error */
 340 static int ehci_bus_resume (struct usb_hcd *hcd)
 341 {
 342         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 343         u32                     temp;
 344         u32                     power_okay;
 345         int                     i;
 346         u8                      resume_needed = 0;
 347
 348         if (time_before (jiffies, ehci->next_statechange))
 349                 msleep(5);
 350         spin_lock_irq (&ehci->lock);
 351         if (!HCD_HW_ACCESSIBLE(hcd)) {
 352                 spin_unlock_irq(&ehci->lock);
 353                 return -ESHUTDOWN;
 354         }
 355
 356         if (unlikely(ehci->debug)) {
 357                 if (!dbgp_reset_prep())
 358                         ehci->debug = NULL;
 359                 else
 360                         dbgp_external_startup();
 361         }
 362
 363         /* Ideally and we've got a real resume here, and no port's power
 364          * was lost.  (For PCI, that means Vaux was maintained.)  But we
 365          * could instead be restoring a swsusp snapshot -- so that BIOS was
 366          * the last user of the controller, not reset/pm hardware keeping
 367          * state we gave to it.
 368          */
 369         power_okay = ehci_readl(ehci, &ehci->regs->intr_enable);
 370         ehci_dbg(ehci, "resume root hub%s\n",
 371                         power_okay ? "" : " after power loss");
 372
 373         /* at least some APM implementations will try to deliver
 374          * IRQs right away, so delay them until we're ready.
 375          */
 376         ehci_writel(ehci, 0, &ehci->regs->intr_enable);
 377
 378         /* re-init operational registers */
 379         ehci_writel(ehci, 0, &ehci->regs->segment);
 380         ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
 381         ehci_writel(ehci, (u32) ehci->async->qh_dma, &ehci->regs->async_next);
 382
 383         /* restore CMD_RUN, framelist size, and irq threshold */
 384         ehci_writel(ehci, ehci->command, &ehci->regs->command);
 385
 386         /* Some controller/firmware combinations need a delay during which
 387          * they set up the port statuses.  See Bugzilla #8190. */
 388         spin_unlock_irq(&ehci->lock);
 389         msleep(8);
 390         spin_lock_irq(&ehci->lock);
 391
 392         /* clear phy low-power mode before resume */
 393         if (ehci->bus_suspended && ehci->has_hostpc) {
 394                 i = HCS_N_PORTS(ehci->hcs_params);
 395                 while (i--) {
 396                         if (test_bit(i, &ehci->bus_suspended)) {
 397                                 u32 __iomem     *hostpc_reg;
 398
 399                                 hostpc_reg = (u32 __iomem *)((u8 *) ehci->regs
 400                                                 + HOSTPC0 + 4 * i);
 401                                 temp = ehci_readl(ehci, hostpc_reg);
 402                                 ehci_writel(ehci, temp & ~HOSTPC_PHCD,
 403                                                 hostpc_reg);
 404                         }
 405                 }
 406                 spin_unlock_irq(&ehci->lock);
 407                 msleep(5);
 408                 spin_lock_irq(&ehci->lock);
 409         }
 410
 411         /* manually resume the ports we suspended during bus_suspend() */
 412         i = HCS_N_PORTS (ehci->hcs_params);
 413         while (i--) {
 414                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 415                 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
 416                 if (test_bit(i, &ehci->bus_suspended) &&
 417                                 (temp & PORT_SUSPEND)) {
 418                         temp |= PORT_RESUME;
 419                         resume_needed = 1;
 420                 }
 421                 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
 422         }
 423
 424         /* msleep for 20ms only if code is trying to resume port */
 425         if (resume_needed) {
 426                 spin_unlock_irq(&ehci->lock);
 427                 msleep(20);
 428                 spin_lock_irq(&ehci->lock);
 429         }
 430
 431         i = HCS_N_PORTS (ehci->hcs_params);
 432         while (i--) {
 433                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 434                 if (test_bit(i, &ehci->bus_suspended) &&
 435                                 (temp & PORT_SUSPEND)) {
 436                         temp &= ~(PORT_RWC_BITS | PORT_RESUME);
 437                         ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
 438                         ehci_vdbg (ehci, "resumed port %d\n", i + 1);
 439                 }
 440         }
 441         (void) ehci_readl(ehci, &ehci->regs->command);
 442
 443         /* maybe re-activate the schedule(s) */
 444         temp = 0;
 445         if (ehci->async->qh_next.qh)
 446                 temp |= CMD_ASE;
 447         if (ehci->periodic_sched)
 448                 temp |= CMD_PSE;
 449         if (temp) {
 450                 ehci->command |= temp;
 451                 ehci_writel(ehci, ehci->command, &ehci->regs->command);
 452         }
 453
 454         ehci->next_statechange = jiffies + msecs_to_jiffies(5);
 455         hcd->state = HC_STATE_RUNNING;
 456
 457         /* Now we can safely re-enable irqs */
 458         ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
 459
 460         spin_unlock_irq (&ehci->lock);
 461         ehci_handover_companion_ports(ehci);
 462         return 0;
 463 }
 464
 465 #else
 466
 467 #define ehci_bus_suspend        NULL
 468 #define ehci_bus_resume         NULL
 469
 470 #endif  /* CONFIG_PM */
 471
 472 /*-------------------------------------------------------------------------*/
 473
 474 /*
 475  * Sets the owner of a port
 476  */
 477 static void set_owner(struct ehci_hcd *ehci, int portnum, int new_owner)
 478 {
 479         u32 __iomem             *status_reg;
 480         u32                     port_status;
 481         int                     try;
 482
 483         status_reg = &ehci->regs->port_status[portnum];
 484
 485         /*
 486          * The controller won't set the OWNER bit if the port is
 487          * enabled, so this loop will sometimes require at least two
 488          * iterations: one to disable the port and one to set OWNER.
 489          */
 490         for (try = 4; try > 0; --try) {
 491                 spin_lock_irq(&ehci->lock);
 492                 port_status = ehci_readl(ehci, status_reg);
 493                 if ((port_status & PORT_OWNER) == new_owner
 494                                 || (port_status & (PORT_OWNER | PORT_CONNECT))
 495                                         == 0)
 496                         try = 0;
 497                 else {
 498                         port_status ^= PORT_OWNER;
 499                         port_status &= ~(PORT_PE | PORT_RWC_BITS);
 500                         ehci_writel(ehci, port_status, status_reg);
 501                 }
 502                 spin_unlock_irq(&ehci->lock);
 503                 if (try > 1)
 504                         msleep(5);
 505         }
 506 }
 507
 508 /*-------------------------------------------------------------------------*/
 509
 510 static int check_reset_complete (
 511         struct ehci_hcd *ehci,
 512         int             index,
 513         u32 __iomem     *status_reg,
 514         int             port_status
 515 ) {
 516         if (!(port_status & PORT_CONNECT))
 517                 return port_status;
 518
 519         /* if reset finished and it's still not enabled -- handoff */
 520         if (!(port_status & PORT_PE)) {
 521
 522                 /* with integrated TT, there's nobody to hand it to! */
 523                 if (ehci_is_TDI(ehci)) {
 524                         ehci_dbg (ehci,
 525                                 "Failed to enable port %d on root hub TT\n",
 526                                 index+1);
 527                         return port_status;
 528                 }
 529
 530                 ehci_dbg (ehci, "port %d full speed --> companion\n",
 531                         index + 1);
 532
 533                 // what happens if HCS_N_CC(params) == 0 ?
 534                 port_status |= PORT_OWNER;
 535                 port_status &= ~PORT_RWC_BITS;
 536                 ehci_writel(ehci, port_status, status_reg);
 537
 538                 /* ensure 440EPX ohci controller state is operational */
 539                 if (ehci->has_amcc_usb23)
 540                         set_ohci_hcfs(ehci, 1);
 541         } else {
 542                 ehci_dbg (ehci, "port %d high speed\n", index + 1);
 543                 /* ensure 440EPx ohci controller state is suspended */
 544                 if (ehci->has_amcc_usb23)
 545                         set_ohci_hcfs(ehci, 0);
 546         }
 547
 548         return port_status;
 549 }
 550
 551 /*-------------------------------------------------------------------------*/
 552
 553
 554 /* build "status change" packet (one or two bytes) from HC registers */
 555
 556 static int
 557 ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
 558 {
 559         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 560         u32             temp, status = 0;
 561         u32             mask;
 562         int             ports, i, retval = 1;
 563         unsigned long   flags;
 564         u32             ppcd = 0;
 565
 566         /* if !USB_SUSPEND, root hub timers won't get shut down ... */
 567         if (!HC_IS_RUNNING(hcd->state))
 568                 return 0;
 569
 570         /* init status to no-changes */
 571         buf [0] = 0;
 572         ports = HCS_N_PORTS (ehci->hcs_params);
 573         if (ports > 7) {
 574                 buf [1] = 0;
 575                 retval++;
 576         }
 577
 578         /* Some boards (mostly VIA?) report bogus overcurrent indications,
 579          * causing massive log spam unless we completely ignore them.  It
 580          * may be relevant that VIA VT8235 controllers, where PORT_POWER is
 581          * always set, seem to clear PORT_OCC and PORT_CSC when writing to
 582          * PORT_POWER; that's surprising, but maybe within-spec.
 583          */
 584         if (!ignore_oc)
 585                 mask = PORT_CSC | PORT_PEC | PORT_OCC;
 586         else
 587                 mask = PORT_CSC | PORT_PEC;
 588         // PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
 589
 590         /* no hub change reports (bit 0) for now (power, ...) */
 591
 592         /* port N changes (bit N)? */
 593         spin_lock_irqsave (&ehci->lock, flags);
 594
 595         /* get per-port change detect bits */
 596         if (ehci->has_ppcd)
 597                 ppcd = ehci_readl(ehci, &ehci->regs->status) >> 16;
 598
 599         for (i = 0; i < ports; i++) {
 600                 /* leverage per-port change bits feature */
 601                 if (ehci->has_ppcd && !(ppcd & (1 << i)))
 602                         continue;
 603                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 604
 605                 /*
 606                  * Return status information even for ports with OWNER set.
 607                  * Otherwise khubd wouldn't see the disconnect event when a
 608                  * high-speed device is switched over to the companion
 609                  * controller by the user.
 610                  */
 611
 612                 if ((temp & mask) != 0 || test_bit(i, &ehci->port_c_suspend)
 613                                 || (ehci->reset_done[i] && time_after_eq(
 614                                         jiffies, ehci->reset_done[i]))) {
 615                         if (i < 7)
 616                             buf [0] |= 1 << (i + 1);
 617                         else
 618                             buf [1] |= 1 << (i - 7);
 619                         status = STS_PCD;
 620                 }
 621         }
 622         /* FIXME autosuspend idle root hubs */
 623         spin_unlock_irqrestore (&ehci->lock, flags);
 624         return status ? retval : 0;
 625 }
 626
 627 /*-------------------------------------------------------------------------*/
 628
 629 static void
 630 ehci_hub_descriptor (
 631         struct ehci_hcd                 *ehci,
 632         struct usb_hub_descriptor       *desc
 633 ) {
 634         int             ports = HCS_N_PORTS (ehci->hcs_params);
 635         u16             temp;
 636
 637         desc->bDescriptorType = 0x29;
 638         desc->bPwrOn2PwrGood = 10;      /* ehci 1.0, 2.3.9 says 20ms max */
 639         desc->bHubContrCurrent = 0;
 640
 641         desc->bNbrPorts = ports;
 642         temp = 1 + (ports / 8);
 643         desc->bDescLength = 7 + 2 * temp;
 644
 645         /* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
 646         memset(&desc->u.hs.DeviceRemovable[0], 0, temp);
 647         memset(&desc->u.hs.DeviceRemovable[temp], 0xff, temp);
 648
 649         temp = 0x0008;                  /* per-port overcurrent reporting */
 650         if (HCS_PPC (ehci->hcs_params))
 651                 temp |= 0x0001;         /* per-port power control */
 652         else
 653                 temp |= 0x0002;         /* no power switching */
 654 #if 0
 655 // re-enable when we support USB_PORT_FEAT_INDICATOR below.
 656         if (HCS_INDICATOR (ehci->hcs_params))
 657                 temp |= 0x0080;         /* per-port indicators (LEDs) */
 658 #endif
 659         desc->wHubCharacteristics = cpu_to_le16(temp);
 660 }
 661
 662 /*-------------------------------------------------------------------------*/
 663
 664 static int ehci_hub_control (
 665         struct usb_hcd  *hcd,
 666         u16             typeReq,
 667         u16             wValue,
 668         u16             wIndex,
 669         char            *buf,
 670         u16             wLength
 671 ) {
 672         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 673         int             ports = HCS_N_PORTS (ehci->hcs_params);
 674         u32 __iomem     *status_reg = &ehci->regs->port_status[
 675                                 (wIndex & 0xff) - 1];
 676         u32 __iomem     *hostpc_reg = NULL;
 677         u32             temp, temp1, status;
 678         unsigned long   flags;
 679         int             retval = 0;
 680         unsigned        selector;
 681
 682         /*
 683          * FIXME:  support SetPortFeatures USB_PORT_FEAT_INDICATOR.
 684          * HCS_INDICATOR may say we can change LEDs to off/amber/green.
 685          * (track current state ourselves) ... blink for diagnostics,
 686          * power, "this is the one", etc.  EHCI spec supports this.
 687          */
 688
 689         if (ehci->has_hostpc)
 690                 hostpc_reg = (u32 __iomem *)((u8 *)ehci->regs
 691                                 + HOSTPC0 + 4 * ((wIndex & 0xff) - 1));
 692         spin_lock_irqsave (&ehci->lock, flags);
 693         switch (typeReq) {
 694         case ClearHubFeature:
 695                 switch (wValue) {
 696                 case C_HUB_LOCAL_POWER:
 697                 case C_HUB_OVER_CURRENT:
 698                         /* no hub-wide feature/status flags */
 699                         break;
 700                 default:
 701                         goto error;
 702                 }
 703                 break;
 704         case ClearPortFeature:
 705                 if (!wIndex || wIndex > ports)
 706                         goto error;
 707                 wIndex--;
 708                 temp = ehci_readl(ehci, status_reg);
 709
 710                 /*
 711                  * Even if OWNER is set, so the port is owned by the
 712                  * companion controller, khubd needs to be able to clear
 713                  * the port-change status bits (especially
 714                  * USB_PORT_STAT_C_CONNECTION).
 715                  */
 716
 717                 switch (wValue) {
 718                 case USB_PORT_FEAT_ENABLE:
 719                         ehci_writel(ehci, temp & ~PORT_PE, status_reg);
 720                         break;
 721                 case USB_PORT_FEAT_C_ENABLE:
 722                         ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_PEC,
 723                                         status_reg);
 724                         break;
 725                 case USB_PORT_FEAT_SUSPEND:
 726                         if (temp & PORT_RESET)
 727                                 goto error;
 728                         if (ehci->no_selective_suspend)
 729                                 break;
 730 #ifdef CONFIG_USB_OTG
 731                         if ((hcd->self.otg_port == (wIndex + 1))
 732                             && hcd->self.b_hnp_enable) {
 733                                 otg_start_hnp(ehci->transceiver);
 734                                 break;
 735                         }
 736 #endif
 737                         if (!(temp & PORT_SUSPEND))
 738                                 break;
 739                         if ((temp & PORT_PE) == 0)
 740                                 goto error;
 741
 742                         /* clear phy low-power mode before resume */
 743                         if (hostpc_reg) {
 744                                 temp1 = ehci_readl(ehci, hostpc_reg);
 745                                 ehci_writel(ehci, temp1 & ~HOSTPC_PHCD,
 746                                                 hostpc_reg);
 747                                 spin_unlock_irqrestore(&ehci->lock, flags);
 748                                 msleep(5);/* wait to leave low-power mode */
 749                                 spin_lock_irqsave(&ehci->lock, flags);
 750                         }
 751                         /* resume signaling for 20 msec */
 752                         temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
 753                         ehci_writel(ehci, temp | PORT_RESUME, status_reg);
 754                         ehci->reset_done[wIndex] = jiffies
 755                                         + msecs_to_jiffies(20);
 756                         break;
 757                 case USB_PORT_FEAT_C_SUSPEND:
 758                         clear_bit(wIndex, &ehci->port_c_suspend);
 759                         break;
 760                 case USB_PORT_FEAT_POWER:
 761                         if (HCS_PPC (ehci->hcs_params))
 762                                 ehci_writel(ehci,
 763                                           temp & ~(PORT_RWC_BITS | PORT_POWER),
 764                                           status_reg);
 765                         break;
 766                 case USB_PORT_FEAT_C_CONNECTION:
 767                         if (ehci->has_lpm) {
 768                                 /* clear PORTSC bits on disconnect */
 769                                 temp &= ~PORT_LPM;
 770                                 temp &= ~PORT_DEV_ADDR;
 771                         }
 772                         ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_CSC,
 773                                         status_reg);
 774                         break;
 775                 case USB_PORT_FEAT_C_OVER_CURRENT:
 776                         ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_OCC,
 777                                         status_reg);
 778                         break;
 779                 case USB_PORT_FEAT_C_RESET:
 780                         /* GetPortStatus clears reset */
 781                         break;
 782                 default:
 783                         goto error;
 784                 }
 785                 ehci_readl(ehci, &ehci->regs->command); /* unblock posted write */
 786                 break;
 787         case GetHubDescriptor:
 788                 ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
 789                         buf);
 790                 break;
 791         case GetHubStatus:
 792                 /* no hub-wide feature/status flags */
 793                 memset (buf, 0, 4);
 794                 //cpu_to_le32s ((u32 *) buf);
 795                 break;
 796         case GetPortStatus:
 797                 if (!wIndex || wIndex > ports)
 798                         goto error;
 799                 wIndex--;
 800                 status = 0;
 801                 temp = ehci_readl(ehci, status_reg);
 802
 803                 // wPortChange bits
 804                 if (temp & PORT_CSC)
 805                         status |= USB_PORT_STAT_C_CONNECTION << 16;
 806                 if (temp & PORT_PEC)
 807                         status |= USB_PORT_STAT_C_ENABLE << 16;
 808
 809                 if ((temp & PORT_OCC) && !ignore_oc){
 810                         status |= USB_PORT_STAT_C_OVERCURRENT << 16;
 811
 812                         /*
 813                          * Hubs should disable port power on over-current.
 814                          * However, not all EHCI implementations do this
 815                          * automatically, even if they _do_ support per-port
 816                          * power switching; they're allowed to just limit the
 817                          * current.  khubd will turn the power back on.
 818                          */
 819                         if ((temp & PORT_OC) && HCS_PPC(ehci->hcs_params)) {
 820                                 ehci_writel(ehci,
 821                                         temp & ~(PORT_RWC_BITS | PORT_POWER),
 822                                         status_reg);
 823                                 temp = ehci_readl(ehci, status_reg);
 824                         }
 825                 }
 826
 827                 /* whoever resumes must GetPortStatus to complete it!! */
 828                 if (temp & PORT_RESUME) {
 829
 830                         /* Remote Wakeup received? */
 831                         if (!ehci->reset_done[wIndex]) {
 832                                 /* resume signaling for 20 msec */
 833                                 ehci->reset_done[wIndex] = jiffies
 834                                                 + msecs_to_jiffies(20);
 835                                 /* check the port again */
 836                                 mod_timer(&ehci_to_hcd(ehci)->rh_timer,
 837                                                 ehci->reset_done[wIndex]);
 838                         }
 839
 840                         /* resume completed? */
 841                         else if (time_after_eq(jiffies,
 842                                         ehci->reset_done[wIndex])) {
 843                                 clear_bit(wIndex, &ehci->suspended_ports);
 844                                 set_bit(wIndex, &ehci->port_c_suspend);
 845                                 ehci->reset_done[wIndex] = 0;
 846
 847                                 /* stop resume signaling */
 848                                 temp = ehci_readl(ehci, status_reg);
 849                                 ehci_writel(ehci,
 850                                         temp & ~(PORT_RWC_BITS | PORT_RESUME),
 851                                         status_reg);
 852                                 retval = handshake(ehci, status_reg,
 853                                            PORT_RESUME, 0, 2000 /* 2msec */);
 854                                 if (retval != 0) {
 855                                         ehci_err(ehci,
 856                                                 "port %d resume error %d\n",
 857                                                 wIndex + 1, retval);
 858                                         goto error;
 859                                 }
 860                                 temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10));
 861                         }
 862                 }
 863
 864                 /* whoever resets must GetPortStatus to complete it!! */
 865                 if ((temp & PORT_RESET)
 866                                 && time_after_eq(jiffies,
 867                                         ehci->reset_done[wIndex])) {
 868                         status |= USB_PORT_STAT_C_RESET << 16;
 869                         ehci->reset_done [wIndex] = 0;
 870
 871                         /* force reset to complete */
 872                         ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESET),
 873                                         status_reg);
 874                         /* REVISIT:  some hardware needs 550+ usec to clear
 875                          * this bit; seems too long to spin routinely...
 876                          */
 877                         retval = handshake(ehci, status_reg,
 878                                         PORT_RESET, 0, 1000);
 879                         if (retval != 0) {
 880                                 ehci_err (ehci, "port %d reset error %d\n",
 881                                         wIndex + 1, retval);
 882                                 goto error;
 883                         }
 884
 885                         /* see what we found out */
 886                         temp = check_reset_complete (ehci, wIndex, status_reg,
 887                                         ehci_readl(ehci, status_reg));
 888                 }
 889
 890                 if (!(temp & (PORT_RESUME|PORT_RESET)))
 891                         ehci->reset_done[wIndex] = 0;
 892
 893                 /* transfer dedicated ports to the companion hc */
 894                 if ((temp & PORT_CONNECT) &&
 895                                 test_bit(wIndex, &ehci->companion_ports)) {
 896                         temp &= ~PORT_RWC_BITS;
 897                         temp |= PORT_OWNER;
 898                         ehci_writel(ehci, temp, status_reg);
 899                         ehci_dbg(ehci, "port %d --> companion\n", wIndex + 1);
 900                         temp = ehci_readl(ehci, status_reg);
 901                 }
 902
 903                 /*
 904                  * Even if OWNER is set, there's no harm letting khubd
 905                  * see the wPortStatus values (they should all be 0 except
 906                  * for PORT_POWER anyway).
 907                  */
 908
 909                 if (temp & PORT_CONNECT) {
 910                         status |= USB_PORT_STAT_CONNECTION;
 911                         // status may be from integrated TT
 912                         if (ehci->has_hostpc) {
 913                                 temp1 = ehci_readl(ehci, hostpc_reg);
 914                                 status |= ehci_port_speed(ehci, temp1);
 915                         } else
 916                                 status |= ehci_port_speed(ehci, temp);
 917                 }
 918                 if (temp & PORT_PE)
 919                         status |= USB_PORT_STAT_ENABLE;
 920
 921                 /* maybe the port was unsuspended without our knowledge */
 922                 if (temp & (PORT_SUSPEND|PORT_RESUME)) {
 923                         status |= USB_PORT_STAT_SUSPEND;
 924                 } else if (test_bit(wIndex, &ehci->suspended_ports)) {
 925                         clear_bit(wIndex, &ehci->suspended_ports);
 926                         ehci->reset_done[wIndex] = 0;
 927                         if (temp & PORT_PE)
 928                                 set_bit(wIndex, &ehci->port_c_suspend);
 929                 }
 930
 931                 if (temp & PORT_OC)
 932                         status |= USB_PORT_STAT_OVERCURRENT;
 933                 if (temp & PORT_RESET)
 934                         status |= USB_PORT_STAT_RESET;
 935                 if (temp & PORT_POWER)
 936                         status |= USB_PORT_STAT_POWER;
 937                 if (test_bit(wIndex, &ehci->port_c_suspend))
 938                         status |= USB_PORT_STAT_C_SUSPEND << 16;
 939
 940 #ifndef VERBOSE_DEBUG
 941         if (status & ~0xffff)   /* only if wPortChange is interesting */
 942 #endif
 943                 dbg_port (ehci, "GetStatus", wIndex + 1, temp);
 944                 put_unaligned_le32(status, buf);
 945                 break;
 946         case SetHubFeature:
 947                 switch (wValue) {
 948                 case C_HUB_LOCAL_POWER:
 949                 case C_HUB_OVER_CURRENT:
 950                         /* no hub-wide feature/status flags */
 951                         break;
 952                 default:
 953                         goto error;
 954                 }
 955                 break;
 956         case SetPortFeature:
 957                 selector = wIndex >> 8;
 958                 wIndex &= 0xff;
 959                 if (unlikely(ehci->debug)) {
 960                         /* If the debug port is active any port
 961                          * feature requests should get denied */
 962                         if (wIndex == HCS_DEBUG_PORT(ehci->hcs_params) &&
 963                             (readl(&ehci->debug->control) & DBGP_ENABLED)) {
 964                                 retval = -ENODEV;
 965                                 goto error_exit;
 966                         }
 967                 }
 968                 if (!wIndex || wIndex > ports)
 969                         goto error;
 970                 wIndex--;
 971                 temp = ehci_readl(ehci, status_reg);
 972                 if (temp & PORT_OWNER)
 973                         break;
 974
 975                 temp &= ~PORT_RWC_BITS;
 976                 switch (wValue) {
 977                 case USB_PORT_FEAT_SUSPEND:
 978                         if (ehci->no_selective_suspend)
 979                                 break;
 980                         if ((temp & PORT_PE) == 0
 981                                         || (temp & PORT_RESET) != 0)
 982                                 goto error;
 983
 984                         /* After above check the port must be connected.
 985                          * Set appropriate bit thus could put phy into low power
 986                          * mode if we have hostpc feature
 987                          */
 988                         temp &= ~PORT_WKCONN_E;
 989                         temp |= PORT_WKDISC_E | PORT_WKOC_E;
 990                         ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
 991                         if (hostpc_reg) {
 992                                 spin_unlock_irqrestore(&ehci->lock, flags);
 993                                 msleep(5);/* 5ms for HCD enter low pwr mode */
 994                                 spin_lock_irqsave(&ehci->lock, flags);
 995                                 temp1 = ehci_readl(ehci, hostpc_reg);
 996                                 ehci_writel(ehci, temp1 | HOSTPC_PHCD,
 997                                         hostpc_reg);
 998                                 temp1 = ehci_readl(ehci, hostpc_reg);
 999                                 ehci_dbg(ehci, "Port%d phy low pwr mode %s\n",
1000                                         wIndex, (temp1 & HOSTPC_PHCD) ?
1001                                         "succeeded" : "failed");
1002                         }
1003                         set_bit(wIndex, &ehci->suspended_ports);
1004                         break;
1005                 case USB_PORT_FEAT_POWER:
1006                         if (HCS_PPC (ehci->hcs_params))
1007                                 ehci_writel(ehci, temp | PORT_POWER,
1008                                                 status_reg);
1009                         break;
1010                 case USB_PORT_FEAT_RESET:
1011                         if (temp & PORT_RESUME)
1012                                 goto error;
1013                         /* line status bits may report this as low speed,
1014                          * which can be fine if this root hub has a
1015                          * transaction translator built in.
1016                          */
1017                         if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
1018                                         && !ehci_is_TDI(ehci)
1019                                         && PORT_USB11 (temp)) {
1020                                 ehci_dbg (ehci,
1021                                         "port %d low speed --> companion\n",
1022                                         wIndex + 1);
1023                                 temp |= PORT_OWNER;
1024                         } else {
1025                                 ehci_vdbg (ehci, "port %d reset\n", wIndex + 1);
1026                                 temp |= PORT_RESET;
1027                                 temp &= ~PORT_PE;
1028
1029                                 /*
1030                                  * caller must wait, then call GetPortStatus
1031                                  * usb 2.0 spec says 50 ms resets on root
1032                                  */
1033                                 ehci->reset_done [wIndex] = jiffies
1034                                                 + msecs_to_jiffies (50);
1035                         }
1036                         ehci_writel(ehci, temp, status_reg);
1037                         break;
1038
1039                 /* For downstream facing ports (these):  one hub port is put
1040                  * into test mode according to USB2 11.24.2.13, then the hub
1041                  * must be reset (which for root hub now means rmmod+modprobe,
1042                  * or else system reboot).  See EHCI 2.3.9 and 4.14 for info
1043                  * about the EHCI-specific stuff.
1044                  */
1045                 case USB_PORT_FEAT_TEST:
1046                         if (!selector || selector > 5)
1047                                 goto error;
1048                         ehci_quiesce(ehci);
1049                         ehci_halt(ehci);
1050                         temp |= selector << 16;
1051                         ehci_writel(ehci, temp, status_reg);
1052                         break;
1053
1054                 default:
1055                         goto error;
1056                 }
1057                 ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
1058                 break;
1059
1060         default:
1061 error:
1062                 /* "stall" on error */
1063                 retval = -EPIPE;
1064         }
1065 error_exit:
1066         spin_unlock_irqrestore (&ehci->lock, flags);
1067         return retval;
1068 }
1069
1070 static void ehci_relinquish_port(struct usb_hcd *hcd, int portnum)
1071 {
1072         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1073
1074         if (ehci_is_TDI(ehci))
1075                 return;
1076         set_owner(ehci, --portnum, PORT_OWNER);
1077 }
1078
1079 static int ehci_port_handed_over(struct usb_hcd *hcd, int portnum)
1080 {
1081         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1082         u32 __iomem             *reg;
1083
1084         if (ehci_is_TDI(ehci))
1085                 return 0;
1086         reg = &ehci->regs->port_status[portnum - 1];
1087         return ehci_readl(ehci, reg) & PORT_OWNER;
1088 }