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         unsigned long           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                         set_bit(i, &resume_needed);
 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, &resume_needed)) {
 435                         temp &= ~(PORT_RWC_BITS | PORT_RESUME);
 436                         ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
 437                         ehci_vdbg (ehci, "resumed port %d\n", i + 1);
 438                 }
 439         }
 440         (void) ehci_readl(ehci, &ehci->regs->command);
 441
 442         /* maybe re-activate the schedule(s) */
 443         temp = 0;
 444         if (ehci->async->qh_next.qh)
 445                 temp |= CMD_ASE;
 446         if (ehci->periodic_sched)
 447                 temp |= CMD_PSE;
 448         if (temp) {
 449                 ehci->command |= temp;
 450                 ehci_writel(ehci, ehci->command, &ehci->regs->command);
 451         }
 452
 453         ehci->next_statechange = jiffies + msecs_to_jiffies(5);
 454         hcd->state = HC_STATE_RUNNING;
 455
 456         /* Now we can safely re-enable irqs */
 457         ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
 458
 459         spin_unlock_irq (&ehci->lock);
 460         ehci_handover_companion_ports(ehci);
 461         return 0;
 462 }
 463
 464 #else
 465
 466 #define ehci_bus_suspend        NULL
 467 #define ehci_bus_resume         NULL
 468
 469 #endif  /* CONFIG_PM */
 470
 471 /*-------------------------------------------------------------------------*/
 472
 473 /*
 474  * Sets the owner of a port
 475  */
 476 static void set_owner(struct ehci_hcd *ehci, int portnum, int new_owner)
 477 {
 478         u32 __iomem             *status_reg;
 479         u32                     port_status;
 480         int                     try;
 481
 482         status_reg = &ehci->regs->port_status[portnum];
 483
 484         /*
 485          * The controller won't set the OWNER bit if the port is
 486          * enabled, so this loop will sometimes require at least two
 487          * iterations: one to disable the port and one to set OWNER.
 488          */
 489         for (try = 4; try > 0; --try) {
 490                 spin_lock_irq(&ehci->lock);
 491                 port_status = ehci_readl(ehci, status_reg);
 492                 if ((port_status & PORT_OWNER) == new_owner
 493                                 || (port_status & (PORT_OWNER | PORT_CONNECT))
 494                                         == 0)
 495                         try = 0;
 496                 else {
 497                         port_status ^= PORT_OWNER;
 498                         port_status &= ~(PORT_PE | PORT_RWC_BITS);
 499                         ehci_writel(ehci, port_status, status_reg);
 500                 }
 501                 spin_unlock_irq(&ehci->lock);
 502                 if (try > 1)
 503                         msleep(5);
 504         }
 505 }
 506
 507 /*-------------------------------------------------------------------------*/
 508
 509 static int check_reset_complete (
 510         struct ehci_hcd *ehci,
 511         int             index,
 512         u32 __iomem     *status_reg,
 513         int             port_status
 514 ) {
 515         if (!(port_status & PORT_CONNECT))
 516                 return port_status;
 517
 518         /* if reset finished and it's still not enabled -- handoff */
 519         if (!(port_status & PORT_PE)) {
 520
 521                 /* with integrated TT, there's nobody to hand it to! */
 522                 if (ehci_is_TDI(ehci)) {
 523                         ehci_dbg (ehci,
 524                                 "Failed to enable port %d on root hub TT\n",
 525                                 index+1);
 526                         return port_status;
 527                 }
 528
 529                 ehci_dbg (ehci, "port %d full speed --> companion\n",
 530                         index + 1);
 531
 532                 // what happens if HCS_N_CC(params) == 0 ?
 533                 port_status |= PORT_OWNER;
 534                 port_status &= ~PORT_RWC_BITS;
 535                 ehci_writel(ehci, port_status, status_reg);
 536
 537                 /* ensure 440EPX ohci controller state is operational */
 538                 if (ehci->has_amcc_usb23)
 539                         set_ohci_hcfs(ehci, 1);
 540         } else {
 541                 ehci_dbg (ehci, "port %d high speed\n", index + 1);
 542                 /* ensure 440EPx ohci controller state is suspended */
 543                 if (ehci->has_amcc_usb23)
 544                         set_ohci_hcfs(ehci, 0);
 545         }
 546
 547         return port_status;
 548 }
 549
 550 /*-------------------------------------------------------------------------*/
 551
 552
 553 /* build "status change" packet (one or two bytes) from HC registers */
 554
 555 static int
 556 ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
 557 {
 558         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 559         u32             temp, status = 0;
 560         u32             mask;
 561         int             ports, i, retval = 1;
 562         unsigned long   flags;
 563         u32             ppcd = 0;
 564
 565         /* if !USB_SUSPEND, root hub timers won't get shut down ... */
 566         if (!HC_IS_RUNNING(hcd->state))
 567                 return 0;
 568
 569         /* init status to no-changes */
 570         buf [0] = 0;
 571         ports = HCS_N_PORTS (ehci->hcs_params);
 572         if (ports > 7) {
 573                 buf [1] = 0;
 574                 retval++;
 575         }
 576
 577         /* Some boards (mostly VIA?) report bogus overcurrent indications,
 578          * causing massive log spam unless we completely ignore them.  It
 579          * may be relevant that VIA VT8235 controllers, where PORT_POWER is
 580          * always set, seem to clear PORT_OCC and PORT_CSC when writing to
 581          * PORT_POWER; that's surprising, but maybe within-spec.
 582          */
 583         if (!ignore_oc)
 584                 mask = PORT_CSC | PORT_PEC | PORT_OCC;
 585         else
 586                 mask = PORT_CSC | PORT_PEC;
 587         // PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
 588
 589         /* no hub change reports (bit 0) for now (power, ...) */
 590
 591         /* port N changes (bit N)? */
 592         spin_lock_irqsave (&ehci->lock, flags);
 593
 594         /* get per-port change detect bits */
 595         if (ehci->has_ppcd)
 596                 ppcd = ehci_readl(ehci, &ehci->regs->status) >> 16;
 597
 598         for (i = 0; i < ports; i++) {
 599                 /* leverage per-port change bits feature */
 600                 if (ehci->has_ppcd && !(ppcd & (1 << i)))
 601                         continue;
 602                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 603
 604                 /*
 605                  * Return status information even for ports with OWNER set.
 606                  * Otherwise khubd wouldn't see the disconnect event when a
 607                  * high-speed device is switched over to the companion
 608                  * controller by the user.
 609                  */
 610
 611                 if ((temp & mask) != 0 || test_bit(i, &ehci->port_c_suspend)
 612                                 || (ehci->reset_done[i] && time_after_eq(
 613                                         jiffies, ehci->reset_done[i]))) {
 614                         if (i < 7)
 615                             buf [0] |= 1 << (i + 1);
 616                         else
 617                             buf [1] |= 1 << (i - 7);
 618                         status = STS_PCD;
 619                 }
 620         }
 621         /* FIXME autosuspend idle root hubs */
 622         spin_unlock_irqrestore (&ehci->lock, flags);
 623         return status ? retval : 0;
 624 }
 625
 626 /*-------------------------------------------------------------------------*/
 627
 628 static void
 629 ehci_hub_descriptor (
 630         struct ehci_hcd                 *ehci,
 631         struct usb_hub_descriptor       *desc
 632 ) {
 633         int             ports = HCS_N_PORTS (ehci->hcs_params);
 634         u16             temp;
 635
 636         desc->bDescriptorType = 0x29;
 637         desc->bPwrOn2PwrGood = 10;      /* ehci 1.0, 2.3.9 says 20ms max */
 638         desc->bHubContrCurrent = 0;
 639
 640         desc->bNbrPorts = ports;
 641         temp = 1 + (ports / 8);
 642         desc->bDescLength = 7 + 2 * temp;
 643
 644         /* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
 645         memset(&desc->u.hs.DeviceRemovable[0], 0, temp);
 646         memset(&desc->u.hs.DeviceRemovable[temp], 0xff, temp);
 647
 648         temp = 0x0008;                  /* per-port overcurrent reporting */
 649         if (HCS_PPC (ehci->hcs_params))
 650                 temp |= 0x0001;         /* per-port power control */
 651         else
 652                 temp |= 0x0002;         /* no power switching */
 653 #if 0
 654 // re-enable when we support USB_PORT_FEAT_INDICATOR below.
 655         if (HCS_INDICATOR (ehci->hcs_params))
 656                 temp |= 0x0080;         /* per-port indicators (LEDs) */
 657 #endif
 658         desc->wHubCharacteristics = cpu_to_le16(temp);
 659 }
 660
 661 /*-------------------------------------------------------------------------*/
 662
 663 static int ehci_hub_control (
 664         struct usb_hcd  *hcd,
 665         u16             typeReq,
 666         u16             wValue,
 667         u16             wIndex,
 668         char            *buf,
 669         u16             wLength
 670 ) {
 671         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 672         int             ports = HCS_N_PORTS (ehci->hcs_params);
 673         u32 __iomem     *status_reg = &ehci->regs->port_status[
 674                                 (wIndex & 0xff) - 1];
 675         u32 __iomem     *hostpc_reg = NULL;
 676         u32             temp, temp1, status;
 677         unsigned long   flags;
 678         int             retval = 0;
 679         unsigned        selector;
 680
 681         /*
 682          * FIXME:  support SetPortFeatures USB_PORT_FEAT_INDICATOR.
 683          * HCS_INDICATOR may say we can change LEDs to off/amber/green.
 684          * (track current state ourselves) ... blink for diagnostics,
 685          * power, "this is the one", etc.  EHCI spec supports this.
 686          */
 687
 688         if (ehci->has_hostpc)
 689                 hostpc_reg = (u32 __iomem *)((u8 *)ehci->regs
 690                                 + HOSTPC0 + 4 * ((wIndex & 0xff) - 1));
 691         spin_lock_irqsave (&ehci->lock, flags);
 692         switch (typeReq) {
 693         case ClearHubFeature:
 694                 switch (wValue) {
 695                 case C_HUB_LOCAL_POWER:
 696                 case C_HUB_OVER_CURRENT:
 697                         /* no hub-wide feature/status flags */
 698                         break;
 699                 default:
 700                         goto error;
 701                 }
 702                 break;
 703         case ClearPortFeature:
 704                 if (!wIndex || wIndex > ports)
 705                         goto error;
 706                 wIndex--;
 707                 temp = ehci_readl(ehci, status_reg);
 708
 709                 /*
 710                  * Even if OWNER is set, so the port is owned by the
 711                  * companion controller, khubd needs to be able to clear
 712                  * the port-change status bits (especially
 713                  * USB_PORT_STAT_C_CONNECTION).
 714                  */
 715
 716                 switch (wValue) {
 717                 case USB_PORT_FEAT_ENABLE:
 718                         ehci_writel(ehci, temp & ~PORT_PE, status_reg);
 719                         break;
 720                 case USB_PORT_FEAT_C_ENABLE:
 721                         ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_PEC,
 722                                         status_reg);
 723                         break;
 724                 case USB_PORT_FEAT_SUSPEND:
 725                         if (temp & PORT_RESET)
 726                                 goto error;
 727                         if (ehci->no_selective_suspend)
 728                                 break;
 729 #ifdef CONFIG_USB_OTG
 730                         if ((hcd->self.otg_port == (wIndex + 1))
 731                             && hcd->self.b_hnp_enable) {
 732                                 otg_start_hnp(ehci->transceiver);
 733                                 break;
 734                         }
 735 #endif
 736                         if (!(temp & PORT_SUSPEND))
 737                                 break;
 738                         if ((temp & PORT_PE) == 0)
 739                                 goto error;
 740
 741                         /* clear phy low-power mode before resume */
 742                         if (hostpc_reg) {
 743                                 temp1 = ehci_readl(ehci, hostpc_reg);
 744                                 ehci_writel(ehci, temp1 & ~HOSTPC_PHCD,
 745                                                 hostpc_reg);
 746                                 spin_unlock_irqrestore(&ehci->lock, flags);
 747                                 msleep(5);/* wait to leave low-power mode */
 748                                 spin_lock_irqsave(&ehci->lock, flags);
 749                         }
 750                         /* resume signaling for 20 msec */
 751                         temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
 752                         ehci_writel(ehci, temp | PORT_RESUME, status_reg);
 753                         ehci->reset_done[wIndex] = jiffies
 754                                         + msecs_to_jiffies(20);
 755                         break;
 756                 case USB_PORT_FEAT_C_SUSPEND:
 757                         clear_bit(wIndex, &ehci->port_c_suspend);
 758                         break;
 759                 case USB_PORT_FEAT_POWER:
 760                         if (HCS_PPC (ehci->hcs_params))
 761                                 ehci_writel(ehci,
 762                                           temp & ~(PORT_RWC_BITS | PORT_POWER),
 763                                           status_reg);
 764                         break;
 765                 case USB_PORT_FEAT_C_CONNECTION:
 766                         if (ehci->has_lpm) {
 767                                 /* clear PORTSC bits on disconnect */
 768                                 temp &= ~PORT_LPM;
 769                                 temp &= ~PORT_DEV_ADDR;
 770                         }
 771                         ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_CSC,
 772                                         status_reg);
 773                         break;
 774                 case USB_PORT_FEAT_C_OVER_CURRENT:
 775                         ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_OCC,
 776                                         status_reg);
 777                         break;
 778                 case USB_PORT_FEAT_C_RESET:
 779                         /* GetPortStatus clears reset */
 780                         break;
 781                 default:
 782                         goto error;
 783                 }
 784                 ehci_readl(ehci, &ehci->regs->command); /* unblock posted write */
 785                 break;
 786         case GetHubDescriptor:
 787                 ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
 788                         buf);
 789                 break;
 790         case GetHubStatus:
 791                 /* no hub-wide feature/status flags */
 792                 memset (buf, 0, 4);
 793                 //cpu_to_le32s ((u32 *) buf);
 794                 break;
 795         case GetPortStatus:
 796                 if (!wIndex || wIndex > ports)
 797                         goto error;
 798                 wIndex--;
 799                 status = 0;
 800                 temp = ehci_readl(ehci, status_reg);
 801
 802                 // wPortChange bits
 803                 if (temp & PORT_CSC)
 804                         status |= USB_PORT_STAT_C_CONNECTION << 16;
 805                 if (temp & PORT_PEC)
 806                         status |= USB_PORT_STAT_C_ENABLE << 16;
 807
 808                 if ((temp & PORT_OCC) && !ignore_oc){
 809                         status |= USB_PORT_STAT_C_OVERCURRENT << 16;
 810
 811                         /*
 812                          * Hubs should disable port power on over-current.
 813                          * However, not all EHCI implementations do this
 814                          * automatically, even if they _do_ support per-port
 815                          * power switching; they're allowed to just limit the
 816                          * current.  khubd will turn the power back on.
 817                          */
 818                         if ((temp & PORT_OC) && HCS_PPC(ehci->hcs_params)) {
 819                                 ehci_writel(ehci,
 820                                         temp & ~(PORT_RWC_BITS | PORT_POWER),
 821                                         status_reg);
 822                                 temp = ehci_readl(ehci, status_reg);
 823                         }
 824                 }
 825
 826                 /* whoever resumes must GetPortStatus to complete it!! */
 827                 if (temp & PORT_RESUME) {
 828
 829                         /* Remote Wakeup received? */
 830                         if (!ehci->reset_done[wIndex]) {
 831                                 /* resume signaling for 20 msec */
 832                                 ehci->reset_done[wIndex] = jiffies
 833                                                 + msecs_to_jiffies(20);
 834                                 /* check the port again */
 835                                 mod_timer(&ehci_to_hcd(ehci)->rh_timer,
 836                                                 ehci->reset_done[wIndex]);
 837                         }
 838
 839                         /* resume completed? */
 840                         else if (time_after_eq(jiffies,
 841                                         ehci->reset_done[wIndex])) {
 842                                 clear_bit(wIndex, &ehci->suspended_ports);
 843                                 set_bit(wIndex, &ehci->port_c_suspend);
 844                                 ehci->reset_done[wIndex] = 0;
 845
 846                                 /* stop resume signaling */
 847                                 temp = ehci_readl(ehci, status_reg);
 848                                 ehci_writel(ehci,
 849                                         temp & ~(PORT_RWC_BITS | PORT_RESUME),
 850                                         status_reg);
 851                                 retval = handshake(ehci, status_reg,
 852                                            PORT_RESUME, 0, 2000 /* 2msec */);
 853                                 if (retval != 0) {
 854                                         ehci_err(ehci,
 855                                                 "port %d resume error %d\n",
 856                                                 wIndex + 1, retval);
 857                                         goto error;
 858                                 }
 859                                 temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10));
 860                         }
 861                 }
 862
 863                 /* whoever resets must GetPortStatus to complete it!! */
 864                 if ((temp & PORT_RESET)
 865                                 && time_after_eq(jiffies,
 866                                         ehci->reset_done[wIndex])) {
 867                         status |= USB_PORT_STAT_C_RESET << 16;
 868                         ehci->reset_done [wIndex] = 0;
 869
 870                         /* force reset to complete */
 871                         ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESET),
 872                                         status_reg);
 873                         /* REVISIT:  some hardware needs 550+ usec to clear
 874                          * this bit; seems too long to spin routinely...
 875                          */
 876                         retval = handshake(ehci, status_reg,
 877                                         PORT_RESET, 0, 1000);
 878                         if (retval != 0) {
 879                                 ehci_err (ehci, "port %d reset error %d\n",
 880                                         wIndex + 1, retval);
 881                                 goto error;
 882                         }
 883
 884                         /* see what we found out */
 885                         temp = check_reset_complete (ehci, wIndex, status_reg,
 886                                         ehci_readl(ehci, status_reg));
 887                 }
 888
 889                 if (!(temp & (PORT_RESUME|PORT_RESET)))
 890                         ehci->reset_done[wIndex] = 0;
 891
 892                 /* transfer dedicated ports to the companion hc */
 893                 if ((temp & PORT_CONNECT) &&
 894                                 test_bit(wIndex, &ehci->companion_ports)) {
 895                         temp &= ~PORT_RWC_BITS;
 896                         temp |= PORT_OWNER;
 897                         ehci_writel(ehci, temp, status_reg);
 898                         ehci_dbg(ehci, "port %d --> companion\n", wIndex + 1);
 899                         temp = ehci_readl(ehci, status_reg);
 900                 }
 901
 902                 /*
 903                  * Even if OWNER is set, there's no harm letting khubd
 904                  * see the wPortStatus values (they should all be 0 except
 905                  * for PORT_POWER anyway).
 906                  */
 907
 908                 if (temp & PORT_CONNECT) {
 909                         status |= USB_PORT_STAT_CONNECTION;
 910                         // status may be from integrated TT
 911                         if (ehci->has_hostpc) {
 912                                 temp1 = ehci_readl(ehci, hostpc_reg);
 913                                 status |= ehci_port_speed(ehci, temp1);
 914                         } else
 915                                 status |= ehci_port_speed(ehci, temp);
 916                 }
 917                 if (temp & PORT_PE)
 918                         status |= USB_PORT_STAT_ENABLE;
 919
 920                 /* maybe the port was unsuspended without our knowledge */
 921                 if (temp & (PORT_SUSPEND|PORT_RESUME)) {
 922                         status |= USB_PORT_STAT_SUSPEND;
 923                 } else if (test_bit(wIndex, &ehci->suspended_ports)) {
 924                         clear_bit(wIndex, &ehci->suspended_ports);
 925                         ehci->reset_done[wIndex] = 0;
 926                         if (temp & PORT_PE)
 927                                 set_bit(wIndex, &ehci->port_c_suspend);
 928                 }
 929
 930                 if (temp & PORT_OC)
 931                         status |= USB_PORT_STAT_OVERCURRENT;
 932                 if (temp & PORT_RESET)
 933                         status |= USB_PORT_STAT_RESET;
 934                 if (temp & PORT_POWER)
 935                         status |= USB_PORT_STAT_POWER;
 936                 if (test_bit(wIndex, &ehci->port_c_suspend))
 937                         status |= USB_PORT_STAT_C_SUSPEND << 16;
 938
 939 #ifndef VERBOSE_DEBUG
 940         if (status & ~0xffff)   /* only if wPortChange is interesting */
 941 #endif
 942                 dbg_port (ehci, "GetStatus", wIndex + 1, temp);
 943                 put_unaligned_le32(status, buf);
 944                 break;
 945         case SetHubFeature:
 946                 switch (wValue) {
 947                 case C_HUB_LOCAL_POWER:
 948                 case C_HUB_OVER_CURRENT:
 949                         /* no hub-wide feature/status flags */
 950                         break;
 951                 default:
 952                         goto error;
 953                 }
 954                 break;
 955         case SetPortFeature:
 956                 selector = wIndex >> 8;
 957                 wIndex &= 0xff;
 958                 if (unlikely(ehci->debug)) {
 959                         /* If the debug port is active any port
 960                          * feature requests should get denied */
 961                         if (wIndex == HCS_DEBUG_PORT(ehci->hcs_params) &&
 962                             (readl(&ehci->debug->control) & DBGP_ENABLED)) {
 963                                 retval = -ENODEV;
 964                                 goto error_exit;
 965                         }
 966                 }
 967                 if (!wIndex || wIndex > ports)
 968                         goto error;
 969                 wIndex--;
 970                 temp = ehci_readl(ehci, status_reg);
 971                 if (temp & PORT_OWNER)
 972                         break;
 973
 974                 temp &= ~PORT_RWC_BITS;
 975                 switch (wValue) {
 976                 case USB_PORT_FEAT_SUSPEND:
 977                         if (ehci->no_selective_suspend)
 978                                 break;
 979                         if ((temp & PORT_PE) == 0
 980                                         || (temp & PORT_RESET) != 0)
 981                                 goto error;
 982
 983                         /* After above check the port must be connected.
 984                          * Set appropriate bit thus could put phy into low power
 985                          * mode if we have hostpc feature
 986                          */
 987                         temp &= ~PORT_WKCONN_E;
 988                         temp |= PORT_WKDISC_E | PORT_WKOC_E;
 989                         ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
 990                         if (hostpc_reg) {
 991                                 spin_unlock_irqrestore(&ehci->lock, flags);
 992                                 msleep(5);/* 5ms for HCD enter low pwr mode */
 993                                 spin_lock_irqsave(&ehci->lock, flags);
 994                                 temp1 = ehci_readl(ehci, hostpc_reg);
 995                                 ehci_writel(ehci, temp1 | HOSTPC_PHCD,
 996                                         hostpc_reg);
 997                                 temp1 = ehci_readl(ehci, hostpc_reg);
 998                                 ehci_dbg(ehci, "Port%d phy low pwr mode %s\n",
 999                                         wIndex, (temp1 & HOSTPC_PHCD) ?
1000                                         "succeeded" : "failed");
1001                         }
1002                         set_bit(wIndex, &ehci->suspended_ports);
1003                         break;
1004                 case USB_PORT_FEAT_POWER:
1005                         if (HCS_PPC (ehci->hcs_params))
1006                                 ehci_writel(ehci, temp | PORT_POWER,
1007                                                 status_reg);
1008                         break;
1009                 case USB_PORT_FEAT_RESET:
1010                         if (temp & PORT_RESUME)
1011                                 goto error;
1012                         /* line status bits may report this as low speed,
1013                          * which can be fine if this root hub has a
1014                          * transaction translator built in.
1015                          */
1016                         if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
1017                                         && !ehci_is_TDI(ehci)
1018                                         && PORT_USB11 (temp)) {
1019                                 ehci_dbg (ehci,
1020                                         "port %d low speed --> companion\n",
1021                                         wIndex + 1);
1022                                 temp |= PORT_OWNER;
1023                         } else {
1024                                 ehci_vdbg (ehci, "port %d reset\n", wIndex + 1);
1025                                 temp |= PORT_RESET;
1026                                 temp &= ~PORT_PE;
1027
1028                                 /*
1029                                  * caller must wait, then call GetPortStatus
1030                                  * usb 2.0 spec says 50 ms resets on root
1031                                  */
1032                                 ehci->reset_done [wIndex] = jiffies
1033                                                 + msecs_to_jiffies (50);
1034                         }
1035                         ehci_writel(ehci, temp, status_reg);
1036                         break;
1037
1038                 /* For downstream facing ports (these):  one hub port is put
1039                  * into test mode according to USB2 11.24.2.13, then the hub
1040                  * must be reset (which for root hub now means rmmod+modprobe,
1041                  * or else system reboot).  See EHCI 2.3.9 and 4.14 for info
1042                  * about the EHCI-specific stuff.
1043                  */
1044                 case USB_PORT_FEAT_TEST:
1045                         if (!selector || selector > 5)
1046                                 goto error;
1047                         ehci_quiesce(ehci);
1048
1049                         /* Put all enabled ports into suspend */
1050                         while (ports--) {
1051                                 u32 __iomem *sreg =
1052                                                 &ehci->regs->port_status[ports];
1053
1054                                 temp = ehci_readl(ehci, sreg) & ~PORT_RWC_BITS;
1055                                 if (temp & PORT_PE)
1056                                         ehci_writel(ehci, temp | PORT_SUSPEND,
1057                                                         sreg);
1058                         }
1059                         ehci_halt(ehci);
1060                         temp = ehci_readl(ehci, status_reg);
1061                         temp |= selector << 16;
1062                         ehci_writel(ehci, temp, status_reg);
1063                         break;
1064
1065                 default:
1066                         goto error;
1067                 }
1068                 ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
1069                 break;
1070
1071         default:
1072 error:
1073                 /* "stall" on error */
1074                 retval = -EPIPE;
1075         }
1076 error_exit:
1077         spin_unlock_irqrestore (&ehci->lock, flags);
1078         return retval;
1079 }
1080
1081 static void ehci_relinquish_port(struct usb_hcd *hcd, int portnum)
1082 {
1083         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1084
1085         if (ehci_is_TDI(ehci))
1086                 return;
1087         set_owner(ehci, --portnum, PORT_OWNER);
1088 }
1089
1090 static int ehci_port_handed_over(struct usb_hcd *hcd, int portnum)
1091 {
1092         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1093         u32 __iomem             *reg;
1094
1095         if (ehci_is_TDI(ehci))
1096                 return 0;
1097         reg = &ehci->regs->port_status[portnum - 1];
1098         return ehci_readl(ehci, reg) & PORT_OWNER;
1099 }