linux/drivers/usb/host/ehci-hub.c
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   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Copyright (C) 2001-2004 by David Brownell
   4 */
   5
   6/* this file is part of ehci-hcd.c */
   7
   8/*-------------------------------------------------------------------------*/
   9
  10/*
  11 * EHCI Root Hub ... the nonsharable stuff
  12 *
  13 * Registers don't need cpu_to_le32, that happens transparently
  14 */
  15
  16/*-------------------------------------------------------------------------*/
  17
  18#define PORT_WAKE_BITS  (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
  19
  20#ifdef  CONFIG_PM
  21
  22static void unlink_empty_async_suspended(struct ehci_hcd *ehci);
  23
  24static int persist_enabled_on_companion(struct usb_device *udev, void *unused)
  25{
  26        return !udev->maxchild && udev->persist_enabled &&
  27                udev->bus->root_hub->speed < USB_SPEED_HIGH;
  28}
  29
  30/* After a power loss, ports that were owned by the companion must be
  31 * reset so that the companion can still own them.
  32 */
  33static void ehci_handover_companion_ports(struct ehci_hcd *ehci)
  34{
  35        u32 __iomem     *reg;
  36        u32             status;
  37        int             port;
  38        __le32          buf;
  39        struct usb_hcd  *hcd = ehci_to_hcd(ehci);
  40
  41        if (!ehci->owned_ports)
  42                return;
  43
  44        /*
  45         * USB 1.1 devices are mostly HIDs, which don't need to persist across
  46         * suspends. If we ensure that none of our companion's devices have
  47         * persist_enabled (by looking through all USB 1.1 buses in the system),
  48         * we can skip this and avoid slowing resume down. Devices without
  49         * persist will just get reenumerated shortly after resume anyway.
  50         */
  51        if (!usb_for_each_dev(NULL, persist_enabled_on_companion))
  52                return;
  53
  54        /* Make sure the ports are powered */
  55        port = HCS_N_PORTS(ehci->hcs_params);
  56        while (port--) {
  57                if (test_bit(port, &ehci->owned_ports)) {
  58                        reg = &ehci->regs->port_status[port];
  59                        status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
  60                        if (!(status & PORT_POWER))
  61                                ehci_port_power(ehci, port, true);
  62                }
  63        }
  64
  65        /* Give the connections some time to appear */
  66        msleep(20);
  67
  68        spin_lock_irq(&ehci->lock);
  69        port = HCS_N_PORTS(ehci->hcs_params);
  70        while (port--) {
  71                if (test_bit(port, &ehci->owned_ports)) {
  72                        reg = &ehci->regs->port_status[port];
  73                        status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
  74
  75                        /* Port already owned by companion? */
  76                        if (status & PORT_OWNER)
  77                                clear_bit(port, &ehci->owned_ports);
  78                        else if (test_bit(port, &ehci->companion_ports))
  79                                ehci_writel(ehci, status & ~PORT_PE, reg);
  80                        else {
  81                                spin_unlock_irq(&ehci->lock);
  82                                ehci_hub_control(hcd, SetPortFeature,
  83                                                USB_PORT_FEAT_RESET, port + 1,
  84                                                NULL, 0);
  85                                spin_lock_irq(&ehci->lock);
  86                        }
  87                }
  88        }
  89        spin_unlock_irq(&ehci->lock);
  90
  91        if (!ehci->owned_ports)
  92                return;
  93        msleep(90);             /* Wait for resets to complete */
  94
  95        spin_lock_irq(&ehci->lock);
  96        port = HCS_N_PORTS(ehci->hcs_params);
  97        while (port--) {
  98                if (test_bit(port, &ehci->owned_ports)) {
  99                        spin_unlock_irq(&ehci->lock);
 100                        ehci_hub_control(hcd, GetPortStatus,
 101                                        0, port + 1,
 102                                        (char *) &buf, sizeof(buf));
 103                        spin_lock_irq(&ehci->lock);
 104
 105                        /* The companion should now own the port,
 106                         * but if something went wrong the port must not
 107                         * remain enabled.
 108                         */
 109                        reg = &ehci->regs->port_status[port];
 110                        status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
 111                        if (status & PORT_OWNER)
 112                                ehci_writel(ehci, status | PORT_CSC, reg);
 113                        else {
 114                                ehci_dbg(ehci, "failed handover port %d: %x\n",
 115                                                port + 1, status);
 116                                ehci_writel(ehci, status & ~PORT_PE, reg);
 117                        }
 118                }
 119        }
 120
 121        ehci->owned_ports = 0;
 122        spin_unlock_irq(&ehci->lock);
 123}
 124
 125static int ehci_port_change(struct ehci_hcd *ehci)
 126{
 127        int i = HCS_N_PORTS(ehci->hcs_params);
 128
 129        /* First check if the controller indicates a change event */
 130
 131        if (ehci_readl(ehci, &ehci->regs->status) & STS_PCD)
 132                return 1;
 133
 134        /*
 135         * Not all controllers appear to update this while going from D3 to D0,
 136         * so check the individual port status registers as well
 137         */
 138
 139        while (i--)
 140                if (ehci_readl(ehci, &ehci->regs->port_status[i]) & PORT_CSC)
 141                        return 1;
 142
 143        return 0;
 144}
 145
 146void ehci_adjust_port_wakeup_flags(struct ehci_hcd *ehci,
 147                bool suspending, bool do_wakeup)
 148{
 149        int             port;
 150        u32             temp;
 151
 152        /* If remote wakeup is enabled for the root hub but disabled
 153         * for the controller, we must adjust all the port wakeup flags
 154         * when the controller is suspended or resumed.  In all other
 155         * cases they don't need to be changed.
 156         */
 157        if (!ehci_to_hcd(ehci)->self.root_hub->do_remote_wakeup || do_wakeup)
 158                return;
 159
 160        spin_lock_irq(&ehci->lock);
 161
 162        /* clear phy low-power mode before changing wakeup flags */
 163        if (ehci->has_tdi_phy_lpm) {
 164                port = HCS_N_PORTS(ehci->hcs_params);
 165                while (port--) {
 166                        u32 __iomem     *hostpc_reg = &ehci->regs->hostpc[port];
 167
 168                        temp = ehci_readl(ehci, hostpc_reg);
 169                        ehci_writel(ehci, temp & ~HOSTPC_PHCD, hostpc_reg);
 170                }
 171                spin_unlock_irq(&ehci->lock);
 172                msleep(5);
 173                spin_lock_irq(&ehci->lock);
 174        }
 175
 176        port = HCS_N_PORTS(ehci->hcs_params);
 177        while (port--) {
 178                u32 __iomem     *reg = &ehci->regs->port_status[port];
 179                u32             t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
 180                u32             t2 = t1 & ~PORT_WAKE_BITS;
 181
 182                /* If we are suspending the controller, clear the flags.
 183                 * If we are resuming the controller, set the wakeup flags.
 184                 */
 185                if (!suspending) {
 186                        if (t1 & PORT_CONNECT)
 187                                t2 |= PORT_WKOC_E | PORT_WKDISC_E;
 188                        else
 189                                t2 |= PORT_WKOC_E | PORT_WKCONN_E;
 190                }
 191                ehci_writel(ehci, t2, reg);
 192        }
 193
 194        /* enter phy low-power mode again */
 195        if (ehci->has_tdi_phy_lpm) {
 196                port = HCS_N_PORTS(ehci->hcs_params);
 197                while (port--) {
 198                        u32 __iomem     *hostpc_reg = &ehci->regs->hostpc[port];
 199
 200                        temp = ehci_readl(ehci, hostpc_reg);
 201                        ehci_writel(ehci, temp | HOSTPC_PHCD, hostpc_reg);
 202                }
 203        }
 204
 205        /* Does the root hub have a port wakeup pending? */
 206        if (!suspending && ehci_port_change(ehci))
 207                usb_hcd_resume_root_hub(ehci_to_hcd(ehci));
 208
 209        spin_unlock_irq(&ehci->lock);
 210}
 211EXPORT_SYMBOL_GPL(ehci_adjust_port_wakeup_flags);
 212
 213static int ehci_bus_suspend (struct usb_hcd *hcd)
 214{
 215        struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 216        int                     port;
 217        int                     mask;
 218        int                     changed;
 219        bool                    fs_idle_delay;
 220
 221        ehci_dbg(ehci, "suspend root hub\n");
 222
 223        if (time_before (jiffies, ehci->next_statechange))
 224                msleep(5);
 225
 226        /* stop the schedules */
 227        ehci_quiesce(ehci);
 228
 229        spin_lock_irq (&ehci->lock);
 230        if (ehci->rh_state < EHCI_RH_RUNNING)
 231                goto done;
 232
 233        /* Once the controller is stopped, port resumes that are already
 234         * in progress won't complete.  Hence if remote wakeup is enabled
 235         * for the root hub and any ports are in the middle of a resume or
 236         * remote wakeup, we must fail the suspend.
 237         */
 238        if (hcd->self.root_hub->do_remote_wakeup) {
 239                if (ehci->resuming_ports) {
 240                        spin_unlock_irq(&ehci->lock);
 241                        ehci_dbg(ehci, "suspend failed because a port is resuming\n");
 242                        return -EBUSY;
 243                }
 244        }
 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        fs_idle_delay = false;
 255        port = HCS_N_PORTS(ehci->hcs_params);
 256        while (port--) {
 257                u32 __iomem     *reg = &ehci->regs->port_status [port];
 258                u32             t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
 259                u32             t2 = t1 & ~PORT_WAKE_BITS;
 260
 261                /* keep track of which ports we suspend */
 262                if (t1 & PORT_OWNER)
 263                        set_bit(port, &ehci->owned_ports);
 264                else if ((t1 & PORT_PE) && !(t1 & PORT_SUSPEND)) {
 265                        t2 |= PORT_SUSPEND;
 266                        set_bit(port, &ehci->bus_suspended);
 267                }
 268
 269                /* enable remote wakeup on all ports, if told to do so */
 270                if (hcd->self.root_hub->do_remote_wakeup) {
 271                        /* only enable appropriate wake bits, otherwise the
 272                         * hardware can not go phy low power mode. If a race
 273                         * condition happens here(connection change during bits
 274                         * set), the port change detection will finally fix it.
 275                         */
 276                        if (t1 & PORT_CONNECT)
 277                                t2 |= PORT_WKOC_E | PORT_WKDISC_E;
 278                        else
 279                                t2 |= PORT_WKOC_E | PORT_WKCONN_E;
 280                }
 281
 282                if (t1 != t2) {
 283                        /*
 284                         * On some controllers, Wake-On-Disconnect will
 285                         * generate false wakeup signals until the bus
 286                         * switches over to full-speed idle.  For their
 287                         * sake, add a delay if we need one.
 288                         */
 289                        if ((t2 & PORT_WKDISC_E) &&
 290                                        ehci_port_speed(ehci, t2) ==
 291                                                USB_PORT_STAT_HIGH_SPEED)
 292                                fs_idle_delay = true;
 293                        ehci_writel(ehci, t2, reg);
 294                        changed = 1;
 295                }
 296        }
 297        spin_unlock_irq(&ehci->lock);
 298
 299        if (changed && ehci_has_fsl_susp_errata(ehci))
 300                /*
 301                 * Wait for at least 10 millisecondes to ensure the controller
 302                 * enter the suspend status before initiating a port resume
 303                 * using the Force Port Resume bit (Not-EHCI compatible).
 304                 */
 305                usleep_range(10000, 20000);
 306
 307        if ((changed && ehci->has_tdi_phy_lpm) || fs_idle_delay) {
 308                /*
 309                 * Wait for HCD to enter low-power mode or for the bus
 310                 * to switch to full-speed idle.
 311                 */
 312                usleep_range(5000, 5500);
 313        }
 314
 315        if (changed && ehci->has_tdi_phy_lpm) {
 316                spin_lock_irq(&ehci->lock);
 317                port = HCS_N_PORTS(ehci->hcs_params);
 318                while (port--) {
 319                        u32 __iomem     *hostpc_reg = &ehci->regs->hostpc[port];
 320                        u32             t3;
 321
 322                        t3 = ehci_readl(ehci, hostpc_reg);
 323                        ehci_writel(ehci, t3 | HOSTPC_PHCD, hostpc_reg);
 324                        t3 = ehci_readl(ehci, hostpc_reg);
 325                        ehci_dbg(ehci, "Port %d phy low-power mode %s\n",
 326                                        port, (t3 & HOSTPC_PHCD) ?
 327                                        "succeeded" : "failed");
 328                }
 329                spin_unlock_irq(&ehci->lock);
 330        }
 331
 332        /* Apparently some devices need a >= 1-uframe delay here */
 333        if (ehci->bus_suspended)
 334                udelay(150);
 335
 336        /* turn off now-idle HC */
 337        ehci_halt (ehci);
 338
 339        spin_lock_irq(&ehci->lock);
 340        if (ehci->enabled_hrtimer_events & BIT(EHCI_HRTIMER_POLL_DEAD))
 341                ehci_handle_controller_death(ehci);
 342        if (ehci->rh_state != EHCI_RH_RUNNING)
 343                goto done;
 344        ehci->rh_state = EHCI_RH_SUSPENDED;
 345
 346        unlink_empty_async_suspended(ehci);
 347
 348        /* Some Synopsys controllers mistakenly leave IAA turned on */
 349        ehci_writel(ehci, STS_IAA, &ehci->regs->status);
 350
 351        /* Any IAA cycle that started before the suspend is now invalid */
 352        end_iaa_cycle(ehci);
 353        ehci_handle_start_intr_unlinks(ehci);
 354        ehci_handle_intr_unlinks(ehci);
 355        end_free_itds(ehci);
 356
 357        /* allow remote wakeup */
 358        mask = INTR_MASK;
 359        if (!hcd->self.root_hub->do_remote_wakeup)
 360                mask &= ~STS_PCD;
 361        ehci_writel(ehci, mask, &ehci->regs->intr_enable);
 362        ehci_readl(ehci, &ehci->regs->intr_enable);
 363
 364 done:
 365        ehci->next_statechange = jiffies + msecs_to_jiffies(10);
 366        ehci->enabled_hrtimer_events = 0;
 367        ehci->next_hrtimer_event = EHCI_HRTIMER_NO_EVENT;
 368        spin_unlock_irq (&ehci->lock);
 369
 370        hrtimer_cancel(&ehci->hrtimer);
 371        return 0;
 372}
 373
 374
 375/* caller has locked the root hub, and should reset/reinit on error */
 376static int ehci_bus_resume (struct usb_hcd *hcd)
 377{
 378        struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 379        u32                     temp;
 380        u32                     power_okay;
 381        int                     i;
 382        unsigned long           resume_needed = 0;
 383
 384        if (time_before (jiffies, ehci->next_statechange))
 385                msleep(5);
 386        spin_lock_irq (&ehci->lock);
 387        if (!HCD_HW_ACCESSIBLE(hcd) || ehci->shutdown)
 388                goto shutdown;
 389
 390        if (unlikely(ehci->debug)) {
 391                if (!dbgp_reset_prep(hcd))
 392                        ehci->debug = NULL;
 393                else
 394                        dbgp_external_startup(hcd);
 395        }
 396
 397        /* Ideally and we've got a real resume here, and no port's power
 398         * was lost.  (For PCI, that means Vaux was maintained.)  But we
 399         * could instead be restoring a swsusp snapshot -- so that BIOS was
 400         * the last user of the controller, not reset/pm hardware keeping
 401         * state we gave to it.
 402         */
 403        power_okay = ehci_readl(ehci, &ehci->regs->intr_enable);
 404        ehci_dbg(ehci, "resume root hub%s\n",
 405                        power_okay ? "" : " after power loss");
 406
 407        /* at least some APM implementations will try to deliver
 408         * IRQs right away, so delay them until we're ready.
 409         */
 410        ehci_writel(ehci, 0, &ehci->regs->intr_enable);
 411
 412        /* re-init operational registers */
 413        ehci_writel(ehci, 0, &ehci->regs->segment);
 414        ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
 415        ehci_writel(ehci, (u32) ehci->async->qh_dma, &ehci->regs->async_next);
 416
 417        /* restore CMD_RUN, framelist size, and irq threshold */
 418        ehci->command |= CMD_RUN;
 419        ehci_writel(ehci, ehci->command, &ehci->regs->command);
 420        ehci->rh_state = EHCI_RH_RUNNING;
 421
 422        /*
 423         * According to Bugzilla #8190, the port status for some controllers
 424         * will be wrong without a delay. At their wrong status, the port
 425         * is enabled, but not suspended neither resumed.
 426         */
 427        i = HCS_N_PORTS(ehci->hcs_params);
 428        while (i--) {
 429                temp = ehci_readl(ehci, &ehci->regs->port_status[i]);
 430                if ((temp & PORT_PE) &&
 431                                !(temp & (PORT_SUSPEND | PORT_RESUME))) {
 432                        ehci_dbg(ehci, "Port status(0x%x) is wrong\n", temp);
 433                        spin_unlock_irq(&ehci->lock);
 434                        msleep(8);
 435                        spin_lock_irq(&ehci->lock);
 436                        break;
 437                }
 438        }
 439
 440        if (ehci->shutdown)
 441                goto shutdown;
 442
 443        /* clear phy low-power mode before resume */
 444        if (ehci->bus_suspended && ehci->has_tdi_phy_lpm) {
 445                i = HCS_N_PORTS(ehci->hcs_params);
 446                while (i--) {
 447                        if (test_bit(i, &ehci->bus_suspended)) {
 448                                u32 __iomem     *hostpc_reg =
 449                                                        &ehci->regs->hostpc[i];
 450
 451                                temp = ehci_readl(ehci, hostpc_reg);
 452                                ehci_writel(ehci, temp & ~HOSTPC_PHCD,
 453                                                hostpc_reg);
 454                        }
 455                }
 456                spin_unlock_irq(&ehci->lock);
 457                msleep(5);
 458                spin_lock_irq(&ehci->lock);
 459                if (ehci->shutdown)
 460                        goto shutdown;
 461        }
 462
 463        /* manually resume the ports we suspended during bus_suspend() */
 464        i = HCS_N_PORTS (ehci->hcs_params);
 465        while (i--) {
 466                temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 467                temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
 468                if (test_bit(i, &ehci->bus_suspended) &&
 469                                (temp & PORT_SUSPEND)) {
 470                        temp |= PORT_RESUME;
 471                        set_bit(i, &resume_needed);
 472                }
 473                ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
 474        }
 475
 476        /*
 477         * msleep for USB_RESUME_TIMEOUT ms only if code is trying to resume
 478         * port
 479         */
 480        if (resume_needed) {
 481                spin_unlock_irq(&ehci->lock);
 482                msleep(USB_RESUME_TIMEOUT);
 483                spin_lock_irq(&ehci->lock);
 484                if (ehci->shutdown)
 485                        goto shutdown;
 486        }
 487
 488        i = HCS_N_PORTS (ehci->hcs_params);
 489        while (i--) {
 490                temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 491                if (test_bit(i, &resume_needed)) {
 492                        temp &= ~(PORT_RWC_BITS | PORT_SUSPEND | PORT_RESUME);
 493                        ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
 494                }
 495        }
 496
 497        ehci->next_statechange = jiffies + msecs_to_jiffies(5);
 498        spin_unlock_irq(&ehci->lock);
 499
 500        ehci_handover_companion_ports(ehci);
 501
 502        /* Now we can safely re-enable irqs */
 503        spin_lock_irq(&ehci->lock);
 504        if (ehci->shutdown)
 505                goto shutdown;
 506        ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
 507        (void) ehci_readl(ehci, &ehci->regs->intr_enable);
 508        spin_unlock_irq(&ehci->lock);
 509
 510        return 0;
 511
 512 shutdown:
 513        spin_unlock_irq(&ehci->lock);
 514        return -ESHUTDOWN;
 515}
 516
 517static unsigned long ehci_get_resuming_ports(struct usb_hcd *hcd)
 518{
 519        struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
 520
 521        return ehci->resuming_ports;
 522}
 523
 524#else
 525
 526#define ehci_bus_suspend        NULL
 527#define ehci_bus_resume         NULL
 528#define ehci_get_resuming_ports NULL
 529
 530#endif  /* CONFIG_PM */
 531
 532/*-------------------------------------------------------------------------*/
 533
 534/*
 535 * Sets the owner of a port
 536 */
 537static void set_owner(struct ehci_hcd *ehci, int portnum, int new_owner)
 538{
 539        u32 __iomem             *status_reg;
 540        u32                     port_status;
 541        int                     try;
 542
 543        status_reg = &ehci->regs->port_status[portnum];
 544
 545        /*
 546         * The controller won't set the OWNER bit if the port is
 547         * enabled, so this loop will sometimes require at least two
 548         * iterations: one to disable the port and one to set OWNER.
 549         */
 550        for (try = 4; try > 0; --try) {
 551                spin_lock_irq(&ehci->lock);
 552                port_status = ehci_readl(ehci, status_reg);
 553                if ((port_status & PORT_OWNER) == new_owner
 554                                || (port_status & (PORT_OWNER | PORT_CONNECT))
 555                                        == 0)
 556                        try = 0;
 557                else {
 558                        port_status ^= PORT_OWNER;
 559                        port_status &= ~(PORT_PE | PORT_RWC_BITS);
 560                        ehci_writel(ehci, port_status, status_reg);
 561                }
 562                spin_unlock_irq(&ehci->lock);
 563                if (try > 1)
 564                        msleep(5);
 565        }
 566}
 567
 568/*-------------------------------------------------------------------------*/
 569
 570static int check_reset_complete (
 571        struct ehci_hcd *ehci,
 572        int             index,
 573        u32 __iomem     *status_reg,
 574        int             port_status
 575) {
 576        if (!(port_status & PORT_CONNECT))
 577                return port_status;
 578
 579        /* if reset finished and it's still not enabled -- handoff */
 580        if (!(port_status & PORT_PE)) {
 581
 582                /* with integrated TT, there's nobody to hand it to! */
 583                if (ehci_is_TDI(ehci)) {
 584                        ehci_dbg (ehci,
 585                                "Failed to enable port %d on root hub TT\n",
 586                                index+1);
 587                        return port_status;
 588                }
 589
 590                ehci_dbg (ehci, "port %d full speed --> companion\n",
 591                        index + 1);
 592
 593                // what happens if HCS_N_CC(params) == 0 ?
 594                port_status |= PORT_OWNER;
 595                port_status &= ~PORT_RWC_BITS;
 596                ehci_writel(ehci, port_status, status_reg);
 597
 598                /* ensure 440EPX ohci controller state is operational */
 599                if (ehci->has_amcc_usb23)
 600                        set_ohci_hcfs(ehci, 1);
 601        } else {
 602                ehci_dbg(ehci, "port %d reset complete, port enabled\n",
 603                        index + 1);
 604                /* ensure 440EPx ohci controller state is suspended */
 605                if (ehci->has_amcc_usb23)
 606                        set_ohci_hcfs(ehci, 0);
 607        }
 608
 609        return port_status;
 610}
 611
 612/*-------------------------------------------------------------------------*/
 613
 614
 615/* build "status change" packet (one or two bytes) from HC registers */
 616
 617static int
 618ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
 619{
 620        struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 621        u32             temp, status;
 622        u32             mask;
 623        int             ports, i, retval = 1;
 624        unsigned long   flags;
 625        u32             ppcd = ~0;
 626
 627        /* init status to no-changes */
 628        buf [0] = 0;
 629        ports = HCS_N_PORTS (ehci->hcs_params);
 630        if (ports > 7) {
 631                buf [1] = 0;
 632                retval++;
 633        }
 634
 635        /* Inform the core about resumes-in-progress by returning
 636         * a non-zero value even if there are no status changes.
 637         */
 638        status = ehci->resuming_ports;
 639
 640        /* Some boards (mostly VIA?) report bogus overcurrent indications,
 641         * causing massive log spam unless we completely ignore them.  It
 642         * may be relevant that VIA VT8235 controllers, where PORT_POWER is
 643         * always set, seem to clear PORT_OCC and PORT_CSC when writing to
 644         * PORT_POWER; that's surprising, but maybe within-spec.
 645         */
 646        if (!ignore_oc && !ehci->spurious_oc)
 647                mask = PORT_CSC | PORT_PEC | PORT_OCC;
 648        else
 649                mask = PORT_CSC | PORT_PEC;
 650        // PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
 651
 652        /* no hub change reports (bit 0) for now (power, ...) */
 653
 654        /* port N changes (bit N)? */
 655        spin_lock_irqsave (&ehci->lock, flags);
 656
 657        /* get per-port change detect bits */
 658        if (ehci->has_ppcd)
 659                ppcd = ehci_readl(ehci, &ehci->regs->status) >> 16;
 660
 661        for (i = 0; i < ports; i++) {
 662                /* leverage per-port change bits feature */
 663                if (ppcd & (1 << i))
 664                        temp = ehci_readl(ehci, &ehci->regs->port_status[i]);
 665                else
 666                        temp = 0;
 667
 668                /*
 669                 * Return status information even for ports with OWNER set.
 670                 * Otherwise hub_wq wouldn't see the disconnect event when a
 671                 * high-speed device is switched over to the companion
 672                 * controller by the user.
 673                 */
 674
 675                if ((temp & mask) != 0 || test_bit(i, &ehci->port_c_suspend)
 676                                || (ehci->reset_done[i] && time_after_eq(
 677                                        jiffies, ehci->reset_done[i]))) {
 678                        if (i < 7)
 679                            buf [0] |= 1 << (i + 1);
 680                        else
 681                            buf [1] |= 1 << (i - 7);
 682                        status = STS_PCD;
 683                }
 684        }
 685
 686        /* If a resume is in progress, make sure it can finish */
 687        if (ehci->resuming_ports)
 688                mod_timer(&hcd->rh_timer, jiffies + msecs_to_jiffies(25));
 689
 690        spin_unlock_irqrestore (&ehci->lock, flags);
 691        return status ? retval : 0;
 692}
 693
 694/*-------------------------------------------------------------------------*/
 695
 696static void
 697ehci_hub_descriptor (
 698        struct ehci_hcd                 *ehci,
 699        struct usb_hub_descriptor       *desc
 700) {
 701        int             ports = HCS_N_PORTS (ehci->hcs_params);
 702        u16             temp;
 703
 704        desc->bDescriptorType = USB_DT_HUB;
 705        desc->bPwrOn2PwrGood = 10;      /* ehci 1.0, 2.3.9 says 20ms max */
 706        desc->bHubContrCurrent = 0;
 707
 708        desc->bNbrPorts = ports;
 709        temp = 1 + (ports / 8);
 710        desc->bDescLength = 7 + 2 * temp;
 711
 712        /* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
 713        memset(&desc->u.hs.DeviceRemovable[0], 0, temp);
 714        memset(&desc->u.hs.DeviceRemovable[temp], 0xff, temp);
 715
 716        temp = HUB_CHAR_INDV_PORT_OCPM; /* per-port overcurrent reporting */
 717        if (HCS_PPC (ehci->hcs_params))
 718                temp |= HUB_CHAR_INDV_PORT_LPSM; /* per-port power control */
 719        else
 720                temp |= HUB_CHAR_NO_LPSM; /* no power switching */
 721#if 0
 722// re-enable when we support USB_PORT_FEAT_INDICATOR below.
 723        if (HCS_INDICATOR (ehci->hcs_params))
 724                temp |= HUB_CHAR_PORTIND; /* per-port indicators (LEDs) */
 725#endif
 726        desc->wHubCharacteristics = cpu_to_le16(temp);
 727}
 728
 729/*-------------------------------------------------------------------------*/
 730
 731int ehci_hub_control(
 732        struct usb_hcd  *hcd,
 733        u16             typeReq,
 734        u16             wValue,
 735        u16             wIndex,
 736        char            *buf,
 737        u16             wLength
 738) {
 739        struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 740        int             ports = HCS_N_PORTS (ehci->hcs_params);
 741        u32 __iomem     *status_reg, *hostpc_reg;
 742        u32             temp, temp1, status;
 743        unsigned long   flags;
 744        int             retval = 0;
 745        unsigned        selector;
 746
 747        /*
 748         * Avoid out-of-bounds values while calculating the port index
 749         * from wIndex.  The compiler doesn't like pointers to invalid
 750         * addresses, even if they are never used.
 751         */
 752        temp = (wIndex - 1) & 0xff;
 753        if (temp >= HCS_N_PORTS_MAX)
 754                temp = 0;
 755        status_reg = &ehci->regs->port_status[temp];
 756        hostpc_reg = &ehci->regs->hostpc[temp];
 757
 758        /*
 759         * FIXME:  support SetPortFeatures USB_PORT_FEAT_INDICATOR.
 760         * HCS_INDICATOR may say we can change LEDs to off/amber/green.
 761         * (track current state ourselves) ... blink for diagnostics,
 762         * power, "this is the one", etc.  EHCI spec supports this.
 763         */
 764
 765        spin_lock_irqsave (&ehci->lock, flags);
 766        switch (typeReq) {
 767        case ClearHubFeature:
 768                switch (wValue) {
 769                case C_HUB_LOCAL_POWER:
 770                case C_HUB_OVER_CURRENT:
 771                        /* no hub-wide feature/status flags */
 772                        break;
 773                default:
 774                        goto error;
 775                }
 776                break;
 777        case ClearPortFeature:
 778                if (!wIndex || wIndex > ports)
 779                        goto error;
 780                wIndex--;
 781                temp = ehci_readl(ehci, status_reg);
 782                temp &= ~PORT_RWC_BITS;
 783
 784                /*
 785                 * Even if OWNER is set, so the port is owned by the
 786                 * companion controller, hub_wq needs to be able to clear
 787                 * the port-change status bits (especially
 788                 * USB_PORT_STAT_C_CONNECTION).
 789                 */
 790
 791                switch (wValue) {
 792                case USB_PORT_FEAT_ENABLE:
 793                        ehci_writel(ehci, temp & ~PORT_PE, status_reg);
 794                        break;
 795                case USB_PORT_FEAT_C_ENABLE:
 796                        ehci_writel(ehci, temp | PORT_PEC, status_reg);
 797                        break;
 798                case USB_PORT_FEAT_SUSPEND:
 799                        if (temp & PORT_RESET)
 800                                goto error;
 801                        if (ehci->no_selective_suspend)
 802                                break;
 803#ifdef CONFIG_USB_OTG
 804                        if ((hcd->self.otg_port == (wIndex + 1))
 805                            && hcd->self.b_hnp_enable) {
 806                                otg_start_hnp(hcd->usb_phy->otg);
 807                                break;
 808                        }
 809#endif
 810                        if (!(temp & PORT_SUSPEND))
 811                                break;
 812                        if ((temp & PORT_PE) == 0)
 813                                goto error;
 814
 815                        /* clear phy low-power mode before resume */
 816                        if (ehci->has_tdi_phy_lpm) {
 817                                temp1 = ehci_readl(ehci, hostpc_reg);
 818                                ehci_writel(ehci, temp1 & ~HOSTPC_PHCD,
 819                                                hostpc_reg);
 820                                spin_unlock_irqrestore(&ehci->lock, flags);
 821                                msleep(5);/* wait to leave low-power mode */
 822                                spin_lock_irqsave(&ehci->lock, flags);
 823                        }
 824                        /* resume signaling for 20 msec */
 825                        temp &= ~PORT_WAKE_BITS;
 826                        ehci_writel(ehci, temp | PORT_RESUME, status_reg);
 827                        ehci->reset_done[wIndex] = jiffies
 828                                        + msecs_to_jiffies(USB_RESUME_TIMEOUT);
 829                        set_bit(wIndex, &ehci->resuming_ports);
 830                        usb_hcd_start_port_resume(&hcd->self, wIndex);
 831                        break;
 832                case USB_PORT_FEAT_C_SUSPEND:
 833                        clear_bit(wIndex, &ehci->port_c_suspend);
 834                        break;
 835                case USB_PORT_FEAT_POWER:
 836                        if (HCS_PPC(ehci->hcs_params)) {
 837                                spin_unlock_irqrestore(&ehci->lock, flags);
 838                                ehci_port_power(ehci, wIndex, false);
 839                                spin_lock_irqsave(&ehci->lock, flags);
 840                        }
 841                        break;
 842                case USB_PORT_FEAT_C_CONNECTION:
 843                        ehci_writel(ehci, temp | PORT_CSC, status_reg);
 844                        break;
 845                case USB_PORT_FEAT_C_OVER_CURRENT:
 846                        ehci_writel(ehci, temp | PORT_OCC, status_reg);
 847                        break;
 848                case USB_PORT_FEAT_C_RESET:
 849                        /* GetPortStatus clears reset */
 850                        break;
 851                default:
 852                        goto error;
 853                }
 854                ehci_readl(ehci, &ehci->regs->command); /* unblock posted write */
 855                break;
 856        case GetHubDescriptor:
 857                ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
 858                        buf);
 859                break;
 860        case GetHubStatus:
 861                /* no hub-wide feature/status flags */
 862                memset (buf, 0, 4);
 863                //cpu_to_le32s ((u32 *) buf);
 864                break;
 865        case GetPortStatus:
 866                if (!wIndex || wIndex > ports)
 867                        goto error;
 868                wIndex--;
 869                status = 0;
 870                temp = ehci_readl(ehci, status_reg);
 871
 872                // wPortChange bits
 873                if (temp & PORT_CSC)
 874                        status |= USB_PORT_STAT_C_CONNECTION << 16;
 875                if (temp & PORT_PEC)
 876                        status |= USB_PORT_STAT_C_ENABLE << 16;
 877
 878                if ((temp & PORT_OCC) && (!ignore_oc && !ehci->spurious_oc)){
 879                        status |= USB_PORT_STAT_C_OVERCURRENT << 16;
 880
 881                        /*
 882                         * Hubs should disable port power on over-current.
 883                         * However, not all EHCI implementations do this
 884                         * automatically, even if they _do_ support per-port
 885                         * power switching; they're allowed to just limit the
 886                         * current.  hub_wq will turn the power back on.
 887                         */
 888                        if (((temp & PORT_OC) || (ehci->need_oc_pp_cycle))
 889                                        && HCS_PPC(ehci->hcs_params)) {
 890                                spin_unlock_irqrestore(&ehci->lock, flags);
 891                                ehci_port_power(ehci, wIndex, false);
 892                                spin_lock_irqsave(&ehci->lock, flags);
 893                                temp = ehci_readl(ehci, status_reg);
 894                        }
 895                }
 896
 897                /* no reset or resume pending */
 898                if (!ehci->reset_done[wIndex]) {
 899
 900                        /* Remote Wakeup received? */
 901                        if (temp & PORT_RESUME) {
 902                                /* resume signaling for 20 msec */
 903                                ehci->reset_done[wIndex] = jiffies
 904                                                + msecs_to_jiffies(20);
 905                                usb_hcd_start_port_resume(&hcd->self, wIndex);
 906                                set_bit(wIndex, &ehci->resuming_ports);
 907                                /* check the port again */
 908                                mod_timer(&ehci_to_hcd(ehci)->rh_timer,
 909                                                ehci->reset_done[wIndex]);
 910                        }
 911
 912                /* reset or resume not yet complete */
 913                } else if (!time_after_eq(jiffies, ehci->reset_done[wIndex])) {
 914                        ;       /* wait until it is complete */
 915
 916                /* resume completed */
 917                } else if (test_bit(wIndex, &ehci->resuming_ports)) {
 918                        clear_bit(wIndex, &ehci->suspended_ports);
 919                        set_bit(wIndex, &ehci->port_c_suspend);
 920                        ehci->reset_done[wIndex] = 0;
 921                        usb_hcd_end_port_resume(&hcd->self, wIndex);
 922
 923                        /* stop resume signaling */
 924                        temp &= ~(PORT_RWC_BITS | PORT_SUSPEND | PORT_RESUME);
 925                        ehci_writel(ehci, temp, status_reg);
 926                        clear_bit(wIndex, &ehci->resuming_ports);
 927                        retval = ehci_handshake(ehci, status_reg,
 928                                        PORT_RESUME, 0, 2000 /* 2msec */);
 929                        if (retval != 0) {
 930                                ehci_err(ehci, "port %d resume error %d\n",
 931                                                wIndex + 1, retval);
 932                                goto error;
 933                        }
 934                        temp = ehci_readl(ehci, status_reg);
 935
 936                /* whoever resets must GetPortStatus to complete it!! */
 937                } else {
 938                        status |= USB_PORT_STAT_C_RESET << 16;
 939                        ehci->reset_done [wIndex] = 0;
 940
 941                        /* force reset to complete */
 942                        ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESET),
 943                                        status_reg);
 944                        /* REVISIT:  some hardware needs 550+ usec to clear
 945                         * this bit; seems too long to spin routinely...
 946                         */
 947                        retval = ehci_handshake(ehci, status_reg,
 948                                        PORT_RESET, 0, 1000);
 949                        if (retval != 0) {
 950                                ehci_err (ehci, "port %d reset error %d\n",
 951                                        wIndex + 1, retval);
 952                                goto error;
 953                        }
 954
 955                        /* see what we found out */
 956                        temp = check_reset_complete (ehci, wIndex, status_reg,
 957                                        ehci_readl(ehci, status_reg));
 958                }
 959
 960                /* transfer dedicated ports to the companion hc */
 961                if ((temp & PORT_CONNECT) &&
 962                                test_bit(wIndex, &ehci->companion_ports)) {
 963                        temp &= ~PORT_RWC_BITS;
 964                        temp |= PORT_OWNER;
 965                        ehci_writel(ehci, temp, status_reg);
 966                        ehci_dbg(ehci, "port %d --> companion\n", wIndex + 1);
 967                        temp = ehci_readl(ehci, status_reg);
 968                }
 969
 970                /*
 971                 * Even if OWNER is set, there's no harm letting hub_wq
 972                 * see the wPortStatus values (they should all be 0 except
 973                 * for PORT_POWER anyway).
 974                 */
 975
 976                if (temp & PORT_CONNECT) {
 977                        status |= USB_PORT_STAT_CONNECTION;
 978                        // status may be from integrated TT
 979                        if (ehci->has_hostpc) {
 980                                temp1 = ehci_readl(ehci, hostpc_reg);
 981                                status |= ehci_port_speed(ehci, temp1);
 982                        } else
 983                                status |= ehci_port_speed(ehci, temp);
 984                }
 985                if (temp & PORT_PE)
 986                        status |= USB_PORT_STAT_ENABLE;
 987
 988                /* maybe the port was unsuspended without our knowledge */
 989                if (temp & (PORT_SUSPEND|PORT_RESUME)) {
 990                        status |= USB_PORT_STAT_SUSPEND;
 991                } else if (test_bit(wIndex, &ehci->suspended_ports)) {
 992                        clear_bit(wIndex, &ehci->suspended_ports);
 993                        clear_bit(wIndex, &ehci->resuming_ports);
 994                        ehci->reset_done[wIndex] = 0;
 995                        if (temp & PORT_PE)
 996                                set_bit(wIndex, &ehci->port_c_suspend);
 997                        usb_hcd_end_port_resume(&hcd->self, wIndex);
 998                }
 999
1000                if (temp & PORT_OC)
1001                        status |= USB_PORT_STAT_OVERCURRENT;
1002                if (temp & PORT_RESET)
1003                        status |= USB_PORT_STAT_RESET;
1004                if (temp & PORT_POWER)
1005                        status |= USB_PORT_STAT_POWER;
1006                if (test_bit(wIndex, &ehci->port_c_suspend))
1007                        status |= USB_PORT_STAT_C_SUSPEND << 16;
1008
1009                if (status & ~0xffff)   /* only if wPortChange is interesting */
1010                        dbg_port(ehci, "GetStatus", wIndex + 1, temp);
1011                put_unaligned_le32(status, buf);
1012                break;
1013        case SetHubFeature:
1014                switch (wValue) {
1015                case C_HUB_LOCAL_POWER:
1016                case C_HUB_OVER_CURRENT:
1017                        /* no hub-wide feature/status flags */
1018                        break;
1019                default:
1020                        goto error;
1021                }
1022                break;
1023        case SetPortFeature:
1024                selector = wIndex >> 8;
1025                wIndex &= 0xff;
1026                if (unlikely(ehci->debug)) {
1027                        /* If the debug port is active any port
1028                         * feature requests should get denied */
1029                        if (wIndex == HCS_DEBUG_PORT(ehci->hcs_params) &&
1030                            (readl(&ehci->debug->control) & DBGP_ENABLED)) {
1031                                retval = -ENODEV;
1032                                goto error_exit;
1033                        }
1034                }
1035                if (!wIndex || wIndex > ports)
1036                        goto error;
1037                wIndex--;
1038                temp = ehci_readl(ehci, status_reg);
1039                if (temp & PORT_OWNER)
1040                        break;
1041
1042                temp &= ~PORT_RWC_BITS;
1043                switch (wValue) {
1044                case USB_PORT_FEAT_SUSPEND:
1045                        if (ehci->no_selective_suspend)
1046                                break;
1047                        if ((temp & PORT_PE) == 0
1048                                        || (temp & PORT_RESET) != 0)
1049                                goto error;
1050
1051                        /* After above check the port must be connected.
1052                         * Set appropriate bit thus could put phy into low power
1053                         * mode if we have tdi_phy_lpm feature
1054                         */
1055                        temp &= ~PORT_WKCONN_E;
1056                        temp |= PORT_WKDISC_E | PORT_WKOC_E;
1057                        ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
1058                        if (ehci->has_tdi_phy_lpm) {
1059                                spin_unlock_irqrestore(&ehci->lock, flags);
1060                                msleep(5);/* 5ms for HCD enter low pwr mode */
1061                                spin_lock_irqsave(&ehci->lock, flags);
1062                                temp1 = ehci_readl(ehci, hostpc_reg);
1063                                ehci_writel(ehci, temp1 | HOSTPC_PHCD,
1064                                        hostpc_reg);
1065                                temp1 = ehci_readl(ehci, hostpc_reg);
1066                                ehci_dbg(ehci, "Port%d phy low pwr mode %s\n",
1067                                        wIndex, (temp1 & HOSTPC_PHCD) ?
1068                                        "succeeded" : "failed");
1069                        }
1070                        if (ehci_has_fsl_susp_errata(ehci)) {
1071                                /* 10ms for HCD enter suspend */
1072                                spin_unlock_irqrestore(&ehci->lock, flags);
1073                                usleep_range(10000, 20000);
1074                                spin_lock_irqsave(&ehci->lock, flags);
1075                        }
1076                        set_bit(wIndex, &ehci->suspended_ports);
1077                        break;
1078                case USB_PORT_FEAT_POWER:
1079                        if (HCS_PPC(ehci->hcs_params)) {
1080                                spin_unlock_irqrestore(&ehci->lock, flags);
1081                                ehci_port_power(ehci, wIndex, true);
1082                                spin_lock_irqsave(&ehci->lock, flags);
1083                        }
1084                        break;
1085                case USB_PORT_FEAT_RESET:
1086                        if (temp & (PORT_SUSPEND|PORT_RESUME))
1087                                goto error;
1088                        /* line status bits may report this as low speed,
1089                         * which can be fine if this root hub has a
1090                         * transaction translator built in.
1091                         */
1092                        if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
1093                                        && !ehci_is_TDI(ehci)
1094                                        && PORT_USB11 (temp)) {
1095                                ehci_dbg (ehci,
1096                                        "port %d low speed --> companion\n",
1097                                        wIndex + 1);
1098                                temp |= PORT_OWNER;
1099                        } else {
1100                                temp |= PORT_RESET;
1101                                temp &= ~PORT_PE;
1102
1103                                /*
1104                                 * caller must wait, then call GetPortStatus
1105                                 * usb 2.0 spec says 50 ms resets on root
1106                                 */
1107                                ehci->reset_done [wIndex] = jiffies
1108                                                + msecs_to_jiffies (50);
1109
1110                                /*
1111                                 * Force full-speed connect for FSL high-speed
1112                                 * erratum; disable HS Chirp by setting PFSC bit
1113                                 */
1114                                if (ehci_has_fsl_hs_errata(ehci))
1115                                        temp |= (1 << PORTSC_FSL_PFSC);
1116                        }
1117                        ehci_writel(ehci, temp, status_reg);
1118                        break;
1119
1120                /* For downstream facing ports (these):  one hub port is put
1121                 * into test mode according to USB2 11.24.2.13, then the hub
1122                 * must be reset (which for root hub now means rmmod+modprobe,
1123                 * or else system reboot).  See EHCI 2.3.9 and 4.14 for info
1124                 * about the EHCI-specific stuff.
1125                 */
1126                case USB_PORT_FEAT_TEST:
1127#ifdef CONFIG_USB_HCD_TEST_MODE
1128                        if (selector == EHSET_TEST_SINGLE_STEP_SET_FEATURE) {
1129                                spin_unlock_irqrestore(&ehci->lock, flags);
1130                                retval = ehset_single_step_set_feature(hcd,
1131                                                                wIndex + 1);
1132                                spin_lock_irqsave(&ehci->lock, flags);
1133                                break;
1134                        }
1135#endif
1136                        if (!selector || selector > 5)
1137                                goto error;
1138                        spin_unlock_irqrestore(&ehci->lock, flags);
1139                        ehci_quiesce(ehci);
1140                        spin_lock_irqsave(&ehci->lock, flags);
1141
1142                        /* Put all enabled ports into suspend */
1143                        while (ports--) {
1144                                u32 __iomem *sreg =
1145                                                &ehci->regs->port_status[ports];
1146
1147                                temp = ehci_readl(ehci, sreg) & ~PORT_RWC_BITS;
1148                                if (temp & PORT_PE)
1149                                        ehci_writel(ehci, temp | PORT_SUSPEND,
1150                                                        sreg);
1151                        }
1152
1153                        spin_unlock_irqrestore(&ehci->lock, flags);
1154                        ehci_halt(ehci);
1155                        spin_lock_irqsave(&ehci->lock, flags);
1156
1157                        temp = ehci_readl(ehci, status_reg);
1158                        temp |= selector << 16;
1159                        ehci_writel(ehci, temp, status_reg);
1160                        break;
1161
1162                default:
1163                        goto error;
1164                }
1165                ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
1166                break;
1167
1168        default:
1169error:
1170                /* "stall" on error */
1171                retval = -EPIPE;
1172        }
1173error_exit:
1174        spin_unlock_irqrestore (&ehci->lock, flags);
1175        return retval;
1176}
1177EXPORT_SYMBOL_GPL(ehci_hub_control);
1178
1179static void ehci_relinquish_port(struct usb_hcd *hcd, int portnum)
1180{
1181        struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1182
1183        if (ehci_is_TDI(ehci))
1184                return;
1185        set_owner(ehci, --portnum, PORT_OWNER);
1186}
1187
1188static int ehci_port_handed_over(struct usb_hcd *hcd, int portnum)
1189{
1190        struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1191        u32 __iomem             *reg;
1192
1193        if (ehci_is_TDI(ehci))
1194                return 0;
1195        reg = &ehci->regs->port_status[portnum - 1];
1196        return ehci_readl(ehci, reg) & PORT_OWNER;
1197}
1198
1199static int ehci_port_power(struct ehci_hcd *ehci, int portnum, bool enable)
1200{
1201        struct usb_hcd *hcd = ehci_to_hcd(ehci);
1202        u32 __iomem *status_reg = &ehci->regs->port_status[portnum];
1203        u32 temp = ehci_readl(ehci, status_reg) & ~PORT_RWC_BITS;
1204
1205        if (enable)
1206                ehci_writel(ehci, temp | PORT_POWER, status_reg);
1207        else
1208                ehci_writel(ehci, temp & ~PORT_POWER, status_reg);
1209
1210        if (hcd->driver->port_power)
1211                hcd->driver->port_power(hcd, portnum, enable);
1212
1213        return 0;
1214}
1215