drivers/usb/host/ehci-hub.c

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This source file includes following definitions.
persist_enabled_on_companion
ehci_handover_companion_ports
ehci_port_change
ehci_adjust_port_wakeup_flags
ehci_bus_suspend
ehci_bus_resume
ehci_get_resuming_ports
set_owner
check_reset_complete
ehci_hub_status_data
ehci_hub_descriptor
usb_ehset_completion
request_single_step_set_feature_urb
ehset_single_step_set_feature
ehci_hub_control
ehci_relinquish_port
ehci_port_handed_over
ehci_port_power
   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 #include <linux/usb/otg.h>
  18 
  19 #define PORT_WAKE_BITS  (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
  20 
  21 #ifdef  CONFIG_PM
  22 
  23 static void unlink_empty_async_suspended(struct ehci_hcd *ehci);
  24 
  25 static int persist_enabled_on_companion(struct usb_device *udev, void *unused)
  26 {
  27         return !udev->maxchild && udev->persist_enabled &&
  28                 udev->bus->root_hub->speed < USB_SPEED_HIGH;
  29 }
  30 
  31 /* After a power loss, ports that were owned by the companion must be
  32  * reset so that the companion can still own them.
  33  */
  34 static void ehci_handover_companion_ports(struct ehci_hcd *ehci)
  35 {
  36         u32 __iomem     *reg;
  37         u32             status;
  38         int             port;
  39         __le32          buf;
  40         struct usb_hcd  *hcd = ehci_to_hcd(ehci);
  41 
  42         if (!ehci->owned_ports)
  43                 return;
  44 
  45         /*
  46          * USB 1.1 devices are mostly HIDs, which don't need to persist across
  47          * suspends. If we ensure that none of our companion's devices have
  48          * persist_enabled (by looking through all USB 1.1 buses in the system),
  49          * we can skip this and avoid slowing resume down. Devices without
  50          * persist will just get reenumerated shortly after resume anyway.
  51          */
  52         if (!usb_for_each_dev(NULL, persist_enabled_on_companion))
  53                 return;
  54 
  55         /* Make sure the ports are powered */
  56         port = HCS_N_PORTS(ehci->hcs_params);
  57         while (port--) {
  58                 if (test_bit(port, &ehci->owned_ports)) {
  59                         reg = &ehci->regs->port_status[port];
  60                         status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
  61                         if (!(status & PORT_POWER))
  62                                 ehci_port_power(ehci, port, true);
  63                 }
  64         }
  65 
  66         /* Give the connections some time to appear */
  67         msleep(20);
  68 
  69         spin_lock_irq(&ehci->lock);
  70         port = HCS_N_PORTS(ehci->hcs_params);
  71         while (port--) {
  72                 if (test_bit(port, &ehci->owned_ports)) {
  73                         reg = &ehci->regs->port_status[port];
  74                         status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
  75 
  76                         /* Port already owned by companion? */
  77                         if (status & PORT_OWNER)
  78                                 clear_bit(port, &ehci->owned_ports);
  79                         else if (test_bit(port, &ehci->companion_ports))
  80                                 ehci_writel(ehci, status & ~PORT_PE, reg);
  81                         else {
  82                                 spin_unlock_irq(&ehci->lock);
  83                                 ehci_hub_control(hcd, SetPortFeature,
  84                                                 USB_PORT_FEAT_RESET, port + 1,
  85                                                 NULL, 0);
  86                                 spin_lock_irq(&ehci->lock);
  87                         }
  88                 }
  89         }
  90         spin_unlock_irq(&ehci->lock);
  91 
  92         if (!ehci->owned_ports)
  93                 return;
  94         msleep(90);             /* Wait for resets to complete */
  95 
  96         spin_lock_irq(&ehci->lock);
  97         port = HCS_N_PORTS(ehci->hcs_params);
  98         while (port--) {
  99                 if (test_bit(port, &ehci->owned_ports)) {
 100                         spin_unlock_irq(&ehci->lock);
 101                         ehci_hub_control(hcd, GetPortStatus,
 102                                         0, port + 1,
 103                                         (char *) &buf, sizeof(buf));
 104                         spin_lock_irq(&ehci->lock);
 105 
 106                         /* The companion should now own the port,
 107                          * but if something went wrong the port must not
 108                          * remain enabled.
 109                          */
 110                         reg = &ehci->regs->port_status[port];
 111                         status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
 112                         if (status & PORT_OWNER)
 113                                 ehci_writel(ehci, status | PORT_CSC, reg);
 114                         else {
 115                                 ehci_dbg(ehci, "failed handover port %d: %x\n",
 116                                                 port + 1, status);
 117                                 ehci_writel(ehci, status & ~PORT_PE, reg);
 118                         }
 119                 }
 120         }
 121 
 122         ehci->owned_ports = 0;
 123         spin_unlock_irq(&ehci->lock);
 124 }
 125 
 126 static int ehci_port_change(struct ehci_hcd *ehci)
 127 {
 128         int i = HCS_N_PORTS(ehci->hcs_params);
 129 
 130         /* First check if the controller indicates a change event */
 131 
 132         if (ehci_readl(ehci, &ehci->regs->status) & STS_PCD)
 133                 return 1;
 134 
 135         /*
 136          * Not all controllers appear to update this while going from D3 to D0,
 137          * so check the individual port status registers as well
 138          */
 139 
 140         while (i--)
 141                 if (ehci_readl(ehci, &ehci->regs->port_status[i]) & PORT_CSC)
 142                         return 1;
 143 
 144         return 0;
 145 }
 146 
 147 void ehci_adjust_port_wakeup_flags(struct ehci_hcd *ehci,
 148                 bool suspending, bool do_wakeup)
 149 {
 150         int             port;
 151         u32             temp;
 152 
 153         /* If remote wakeup is enabled for the root hub but disabled
 154          * for the controller, we must adjust all the port wakeup flags
 155          * when the controller is suspended or resumed.  In all other
 156          * cases they don't need to be changed.
 157          */
 158         if (!ehci_to_hcd(ehci)->self.root_hub->do_remote_wakeup || do_wakeup)
 159                 return;
 160 
 161         spin_lock_irq(&ehci->lock);
 162 
 163         /* clear phy low-power mode before changing wakeup flags */
 164         if (ehci->has_tdi_phy_lpm) {
 165                 port = HCS_N_PORTS(ehci->hcs_params);
 166                 while (port--) {
 167                         u32 __iomem     *hostpc_reg = &ehci->regs->hostpc[port];
 168 
 169                         temp = ehci_readl(ehci, hostpc_reg);
 170                         ehci_writel(ehci, temp & ~HOSTPC_PHCD, hostpc_reg);
 171                 }
 172                 spin_unlock_irq(&ehci->lock);
 173                 msleep(5);
 174                 spin_lock_irq(&ehci->lock);
 175         }
 176 
 177         port = HCS_N_PORTS(ehci->hcs_params);
 178         while (port--) {
 179                 u32 __iomem     *reg = &ehci->regs->port_status[port];
 180                 u32             t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
 181                 u32             t2 = t1 & ~PORT_WAKE_BITS;
 182 
 183                 /* If we are suspending the controller, clear the flags.
 184                  * If we are resuming the controller, set the wakeup flags.
 185                  */
 186                 if (!suspending) {
 187                         if (t1 & PORT_CONNECT)
 188                                 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
 189                         else
 190                                 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
 191                 }
 192                 ehci_writel(ehci, t2, reg);
 193         }
 194 
 195         /* enter phy low-power mode again */
 196         if (ehci->has_tdi_phy_lpm) {
 197                 port = HCS_N_PORTS(ehci->hcs_params);
 198                 while (port--) {
 199                         u32 __iomem     *hostpc_reg = &ehci->regs->hostpc[port];
 200 
 201                         temp = ehci_readl(ehci, hostpc_reg);
 202                         ehci_writel(ehci, temp | HOSTPC_PHCD, hostpc_reg);
 203                 }
 204         }
 205 
 206         /* Does the root hub have a port wakeup pending? */
 207         if (!suspending && ehci_port_change(ehci))
 208                 usb_hcd_resume_root_hub(ehci_to_hcd(ehci));
 209 
 210         spin_unlock_irq(&ehci->lock);
 211 }
 212 EXPORT_SYMBOL_GPL(ehci_adjust_port_wakeup_flags);
 213 
 214 static int ehci_bus_suspend (struct usb_hcd *hcd)
 215 {
 216         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 217         int                     port;
 218         int                     mask;
 219         int                     changed;
 220         bool                    fs_idle_delay;
 221 
 222         ehci_dbg(ehci, "suspend root hub\n");
 223 
 224         if (time_before (jiffies, ehci->next_statechange))
 225                 msleep(5);
 226 
 227         /* stop the schedules */
 228         ehci_quiesce(ehci);
 229 
 230         spin_lock_irq (&ehci->lock);
 231         if (ehci->rh_state < EHCI_RH_RUNNING)
 232                 goto done;
 233 
 234         /* Once the controller is stopped, port resumes that are already
 235          * in progress won't complete.  Hence if remote wakeup is enabled
 236          * for the root hub and any ports are in the middle of a resume or
 237          * remote wakeup, we must fail the suspend.
 238          */
 239         if (hcd->self.root_hub->do_remote_wakeup) {
 240                 if (ehci->resuming_ports) {
 241                         spin_unlock_irq(&ehci->lock);
 242                         ehci_dbg(ehci, "suspend failed because a port is resuming\n");
 243                         return -EBUSY;
 244                 }
 245         }
 246 
 247         /* Unlike other USB host controller types, EHCI doesn't have
 248          * any notion of "global" or bus-wide suspend.  The driver has
 249          * to manually suspend all the active unsuspended ports, and
 250          * then manually resume them in the bus_resume() routine.
 251          */
 252         ehci->bus_suspended = 0;
 253         ehci->owned_ports = 0;
 254         changed = 0;
 255         fs_idle_delay = false;
 256         port = HCS_N_PORTS(ehci->hcs_params);
 257         while (port--) {
 258                 u32 __iomem     *reg = &ehci->regs->port_status [port];
 259                 u32             t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
 260                 u32             t2 = t1 & ~PORT_WAKE_BITS;
 261 
 262                 /* keep track of which ports we suspend */
 263                 if (t1 & PORT_OWNER)
 264                         set_bit(port, &ehci->owned_ports);
 265                 else if ((t1 & PORT_PE) && !(t1 & PORT_SUSPEND)) {
 266                         t2 |= PORT_SUSPEND;
 267                         set_bit(port, &ehci->bus_suspended);
 268                 }
 269 
 270                 /* enable remote wakeup on all ports, if told to do so */
 271                 if (hcd->self.root_hub->do_remote_wakeup) {
 272                         /* only enable appropriate wake bits, otherwise the
 273                          * hardware can not go phy low power mode. If a race
 274                          * condition happens here(connection change during bits
 275                          * set), the port change detection will finally fix it.
 276                          */
 277                         if (t1 & PORT_CONNECT)
 278                                 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
 279                         else
 280                                 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
 281                 }
 282 
 283                 if (t1 != t2) {
 284                         /*
 285                          * On some controllers, Wake-On-Disconnect will
 286                          * generate false wakeup signals until the bus
 287                          * switches over to full-speed idle.  For their
 288                          * sake, add a delay if we need one.
 289                          */
 290                         if ((t2 & PORT_WKDISC_E) &&
 291                                         ehci_port_speed(ehci, t2) ==
 292                                                 USB_PORT_STAT_HIGH_SPEED)
 293                                 fs_idle_delay = true;
 294                         ehci_writel(ehci, t2, reg);
 295                         changed = 1;
 296                 }
 297         }
 298         spin_unlock_irq(&ehci->lock);
 299 
 300         if (changed && ehci_has_fsl_susp_errata(ehci))
 301                 /*
 302                  * Wait for at least 10 millisecondes to ensure the controller
 303                  * enter the suspend status before initiating a port resume
 304                  * using the Force Port Resume bit (Not-EHCI compatible).
 305                  */
 306                 usleep_range(10000, 20000);
 307 
 308         if ((changed && ehci->has_tdi_phy_lpm) || fs_idle_delay) {
 309                 /*
 310                  * Wait for HCD to enter low-power mode or for the bus
 311                  * to switch to full-speed idle.
 312                  */
 313                 usleep_range(5000, 5500);
 314         }
 315 
 316         if (changed && ehci->has_tdi_phy_lpm) {
 317                 spin_lock_irq(&ehci->lock);
 318                 port = HCS_N_PORTS(ehci->hcs_params);
 319                 while (port--) {
 320                         u32 __iomem     *hostpc_reg = &ehci->regs->hostpc[port];
 321                         u32             t3;
 322 
 323                         t3 = ehci_readl(ehci, hostpc_reg);
 324                         ehci_writel(ehci, t3 | HOSTPC_PHCD, hostpc_reg);
 325                         t3 = ehci_readl(ehci, hostpc_reg);
 326                         ehci_dbg(ehci, "Port %d phy low-power mode %s\n",
 327                                         port, (t3 & HOSTPC_PHCD) ?
 328                                         "succeeded" : "failed");
 329                 }
 330                 spin_unlock_irq(&ehci->lock);
 331         }
 332 
 333         /* Apparently some devices need a >= 1-uframe delay here */
 334         if (ehci->bus_suspended)
 335                 udelay(150);
 336 
 337         /* turn off now-idle HC */
 338         ehci_halt (ehci);
 339 
 340         spin_lock_irq(&ehci->lock);
 341         if (ehci->enabled_hrtimer_events & BIT(EHCI_HRTIMER_POLL_DEAD))
 342                 ehci_handle_controller_death(ehci);
 343         if (ehci->rh_state != EHCI_RH_RUNNING)
 344                 goto done;
 345         ehci->rh_state = EHCI_RH_SUSPENDED;
 346 
 347         unlink_empty_async_suspended(ehci);
 348 
 349         /* Any IAA cycle that started before the suspend is now invalid */
 350         end_iaa_cycle(ehci);
 351         ehci_handle_start_intr_unlinks(ehci);
 352         ehci_handle_intr_unlinks(ehci);
 353         end_free_itds(ehci);
 354 
 355         /* allow remote wakeup */
 356         mask = INTR_MASK;
 357         if (!hcd->self.root_hub->do_remote_wakeup)
 358                 mask &= ~STS_PCD;
 359         ehci_writel(ehci, mask, &ehci->regs->intr_enable);
 360         ehci_readl(ehci, &ehci->regs->intr_enable);
 361 
 362  done:
 363         ehci->next_statechange = jiffies + msecs_to_jiffies(10);
 364         ehci->enabled_hrtimer_events = 0;
 365         ehci->next_hrtimer_event = EHCI_HRTIMER_NO_EVENT;
 366         spin_unlock_irq (&ehci->lock);
 367 
 368         hrtimer_cancel(&ehci->hrtimer);
 369         return 0;
 370 }
 371 
 372 
 373 /* caller has locked the root hub, and should reset/reinit on error */
 374 static int ehci_bus_resume (struct usb_hcd *hcd)
 375 {
 376         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
 377         u32                     temp;
 378         u32                     power_okay;
 379         int                     i;
 380         unsigned long           resume_needed = 0;
 381 
 382         if (time_before (jiffies, ehci->next_statechange))
 383                 msleep(5);
 384         spin_lock_irq (&ehci->lock);
 385         if (!HCD_HW_ACCESSIBLE(hcd) || ehci->shutdown)
 386                 goto shutdown;
 387 
 388         if (unlikely(ehci->debug)) {
 389                 if (!dbgp_reset_prep(hcd))
 390                         ehci->debug = NULL;
 391                 else
 392                         dbgp_external_startup(hcd);
 393         }
 394 
 395         /* Ideally and we've got a real resume here, and no port's power
 396          * was lost.  (For PCI, that means Vaux was maintained.)  But we
 397          * could instead be restoring a swsusp snapshot -- so that BIOS was
 398          * the last user of the controller, not reset/pm hardware keeping
 399          * state we gave to it.
 400          */
 401         power_okay = ehci_readl(ehci, &ehci->regs->intr_enable);
 402         ehci_dbg(ehci, "resume root hub%s\n",
 403                         power_okay ? "" : " after power loss");
 404 
 405         /* at least some APM implementations will try to deliver
 406          * IRQs right away, so delay them until we're ready.
 407          */
 408         ehci_writel(ehci, 0, &ehci->regs->intr_enable);
 409 
 410         /* re-init operational registers */
 411         ehci_writel(ehci, 0, &ehci->regs->segment);
 412         ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
 413         ehci_writel(ehci, (u32) ehci->async->qh_dma, &ehci->regs->async_next);
 414 
 415         /* restore CMD_RUN, framelist size, and irq threshold */
 416         ehci->command |= CMD_RUN;
 417         ehci_writel(ehci, ehci->command, &ehci->regs->command);
 418         ehci->rh_state = EHCI_RH_RUNNING;
 419 
 420         /*
 421          * According to Bugzilla #8190, the port status for some controllers
 422          * will be wrong without a delay. At their wrong status, the port
 423          * is enabled, but not suspended neither resumed.
 424          */
 425         i = HCS_N_PORTS(ehci->hcs_params);
 426         while (i--) {
 427                 temp = ehci_readl(ehci, &ehci->regs->port_status[i]);
 428                 if ((temp & PORT_PE) &&
 429                                 !(temp & (PORT_SUSPEND | PORT_RESUME))) {
 430                         ehci_dbg(ehci, "Port status(0x%x) is wrong\n", temp);
 431                         spin_unlock_irq(&ehci->lock);
 432                         msleep(8);
 433                         spin_lock_irq(&ehci->lock);
 434                         break;
 435                 }
 436         }
 437 
 438         if (ehci->shutdown)
 439                 goto shutdown;
 440 
 441         /* clear phy low-power mode before resume */
 442         if (ehci->bus_suspended && ehci->has_tdi_phy_lpm) {
 443                 i = HCS_N_PORTS(ehci->hcs_params);
 444                 while (i--) {
 445                         if (test_bit(i, &ehci->bus_suspended)) {
 446                                 u32 __iomem     *hostpc_reg =
 447                                                         &ehci->regs->hostpc[i];
 448 
 449                                 temp = ehci_readl(ehci, hostpc_reg);
 450                                 ehci_writel(ehci, temp & ~HOSTPC_PHCD,
 451                                                 hostpc_reg);
 452                         }
 453                 }
 454                 spin_unlock_irq(&ehci->lock);
 455                 msleep(5);
 456                 spin_lock_irq(&ehci->lock);
 457                 if (ehci->shutdown)
 458                         goto shutdown;
 459         }
 460 
 461         /* manually resume the ports we suspended during bus_suspend() */
 462         i = HCS_N_PORTS (ehci->hcs_params);
 463         while (i--) {
 464                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 465                 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
 466                 if (test_bit(i, &ehci->bus_suspended) &&
 467                                 (temp & PORT_SUSPEND)) {
 468                         temp |= PORT_RESUME;
 469                         set_bit(i, &resume_needed);
 470                 }
 471                 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
 472         }
 473 
 474         /*
 475          * msleep for USB_RESUME_TIMEOUT ms only if code is trying to resume
 476          * port
 477          */
 478         if (resume_needed) {
 479                 spin_unlock_irq(&ehci->lock);
 480                 msleep(USB_RESUME_TIMEOUT);
 481                 spin_lock_irq(&ehci->lock);
 482                 if (ehci->shutdown)
 483                         goto shutdown;
 484         }
 485 
 486         i = HCS_N_PORTS (ehci->hcs_params);
 487         while (i--) {
 488                 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 489                 if (test_bit(i, &resume_needed)) {
 490                         temp &= ~(PORT_RWC_BITS | PORT_SUSPEND | PORT_RESUME);
 491                         ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
 492                 }
 493         }
 494 
 495         ehci->next_statechange = jiffies + msecs_to_jiffies(5);
 496         spin_unlock_irq(&ehci->lock);
 497 
 498         ehci_handover_companion_ports(ehci);
 499 
 500         /* Now we can safely re-enable irqs */
 501         spin_lock_irq(&ehci->lock);
 502         if (ehci->shutdown)
 503                 goto shutdown;
 504         ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
 505         (void) ehci_readl(ehci, &ehci->regs->intr_enable);
 506         spin_unlock_irq(&ehci->lock);
 507 
 508         return 0;
 509 
 510  shutdown:
 511         spin_unlock_irq(&ehci->lock);
 512         return -ESHUTDOWN;
 513 }
 514 
 515 static unsigned long ehci_get_resuming_ports(struct usb_hcd *hcd)
 516 {
 517         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
 518 
 519         return ehci->resuming_ports;
 520 }
 521 
 522 #else
 523 
 524 #define ehci_bus_suspend        NULL
 525 #define ehci_bus_resume         NULL
 526 #define ehci_get_resuming_ports NULL
 527 
 528 #endif  /* CONFIG_PM */
 529 
 530 /*-------------------------------------------------------------------------*/
 531 
 532 /*
 533  * Sets the owner of a port
 534  */
 535 static void set_owner(struct ehci_hcd *ehci, int portnum, int new_owner)
 536 {
 537         u32 __iomem             *status_reg;
 538         u32                     port_status;
 539         int                     try;
 540 
 541         status_reg = &ehci->regs->port_status[portnum];
 542 
 543         /*
 544          * The controller won't set the OWNER bit if the port is
 545          * enabled, so this loop will sometimes require at least two
 546          * iterations: one to disable the port and one to set OWNER.
 547          */
 548         for (try = 4; try > 0; --try) {
 549                 spin_lock_irq(&ehci->lock);
 550                 port_status = ehci_readl(ehci, status_reg);
 551                 if ((port_status & PORT_OWNER) == new_owner
 552                                 || (port_status & (PORT_OWNER | PORT_CONNECT))
 553                                         == 0)
 554                         try = 0;
 555                 else {
 556                         port_status ^= PORT_OWNER;
 557                         port_status &= ~(PORT_PE | PORT_RWC_BITS);
 558                         ehci_writel(ehci, port_status, status_reg);
 559                 }
 560                 spin_unlock_irq(&ehci->lock);
 561                 if (try > 1)
 562                         msleep(5);
 563         }
 564 }
 565 
 566 /*-------------------------------------------------------------------------*/
 567 
 568 static int check_reset_complete (
 569         struct ehci_hcd *ehci,
 570         int             index,
 571         u32 __iomem     *status_reg,
 572         int             port_status
 573 ) {
 574         if (!(port_status & PORT_CONNECT))
 575                 return port_status;
 576 
 577         /* if reset finished and it's still not enabled -- handoff */
 578         if (!(port_status & PORT_PE)) {
 579 
 580                 /* with integrated TT, there's nobody to hand it to! */
 581                 if (ehci_is_TDI(ehci)) {
 582                         ehci_dbg (ehci,
 583                                 "Failed to enable port %d on root hub TT\n",
 584                                 index+1);
 585                         return port_status;
 586                 }
 587 
 588                 ehci_dbg (ehci, "port %d full speed --> companion\n",
 589                         index + 1);
 590 
 591                 // what happens if HCS_N_CC(params) == 0 ?
 592                 port_status |= PORT_OWNER;
 593                 port_status &= ~PORT_RWC_BITS;
 594                 ehci_writel(ehci, port_status, status_reg);
 595 
 596                 /* ensure 440EPX ohci controller state is operational */
 597                 if (ehci->has_amcc_usb23)
 598                         set_ohci_hcfs(ehci, 1);
 599         } else {
 600                 ehci_dbg(ehci, "port %d reset complete, port enabled\n",
 601                         index + 1);
 602                 /* ensure 440EPx ohci controller state is suspended */
 603                 if (ehci->has_amcc_usb23)
 604                         set_ohci_hcfs(ehci, 0);
 605         }
 606 
 607         return port_status;
 608 }
 609 
 610 /*-------------------------------------------------------------------------*/
 611 
 612 
 613 /* build "status change" packet (one or two bytes) from HC registers */
 614 
 615 static int
 616 ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
 617 {
 618         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 619         u32             temp, status;
 620         u32             mask;
 621         int             ports, i, retval = 1;
 622         unsigned long   flags;
 623         u32             ppcd = ~0;
 624 
 625         /* init status to no-changes */
 626         buf [0] = 0;
 627         ports = HCS_N_PORTS (ehci->hcs_params);
 628         if (ports > 7) {
 629                 buf [1] = 0;
 630                 retval++;
 631         }
 632 
 633         /* Inform the core about resumes-in-progress by returning
 634          * a non-zero value even if there are no status changes.
 635          */
 636         status = ehci->resuming_ports;
 637 
 638         /* Some boards (mostly VIA?) report bogus overcurrent indications,
 639          * causing massive log spam unless we completely ignore them.  It
 640          * may be relevant that VIA VT8235 controllers, where PORT_POWER is
 641          * always set, seem to clear PORT_OCC and PORT_CSC when writing to
 642          * PORT_POWER; that's surprising, but maybe within-spec.
 643          */
 644         if (!ignore_oc)
 645                 mask = PORT_CSC | PORT_PEC | PORT_OCC;
 646         else
 647                 mask = PORT_CSC | PORT_PEC;
 648         // PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
 649 
 650         /* no hub change reports (bit 0) for now (power, ...) */
 651 
 652         /* port N changes (bit N)? */
 653         spin_lock_irqsave (&ehci->lock, flags);
 654 
 655         /* get per-port change detect bits */
 656         if (ehci->has_ppcd)
 657                 ppcd = ehci_readl(ehci, &ehci->regs->status) >> 16;
 658 
 659         for (i = 0; i < ports; i++) {
 660                 /* leverage per-port change bits feature */
 661                 if (ppcd & (1 << i))
 662                         temp = ehci_readl(ehci, &ehci->regs->port_status[i]);
 663                 else
 664                         temp = 0;
 665 
 666                 /*
 667                  * Return status information even for ports with OWNER set.
 668                  * Otherwise hub_wq wouldn't see the disconnect event when a
 669                  * high-speed device is switched over to the companion
 670                  * controller by the user.
 671                  */
 672 
 673                 if ((temp & mask) != 0 || test_bit(i, &ehci->port_c_suspend)
 674                                 || (ehci->reset_done[i] && time_after_eq(
 675                                         jiffies, ehci->reset_done[i]))) {
 676                         if (i < 7)
 677                             buf [0] |= 1 << (i + 1);
 678                         else
 679                             buf [1] |= 1 << (i - 7);
 680                         status = STS_PCD;
 681                 }
 682         }
 683 
 684         /* If a resume is in progress, make sure it can finish */
 685         if (ehci->resuming_ports)
 686                 mod_timer(&hcd->rh_timer, jiffies + msecs_to_jiffies(25));
 687 
 688         spin_unlock_irqrestore (&ehci->lock, flags);
 689         return status ? retval : 0;
 690 }
 691 
 692 /*-------------------------------------------------------------------------*/
 693 
 694 static void
 695 ehci_hub_descriptor (
 696         struct ehci_hcd                 *ehci,
 697         struct usb_hub_descriptor       *desc
 698 ) {
 699         int             ports = HCS_N_PORTS (ehci->hcs_params);
 700         u16             temp;
 701 
 702         desc->bDescriptorType = USB_DT_HUB;
 703         desc->bPwrOn2PwrGood = 10;      /* ehci 1.0, 2.3.9 says 20ms max */
 704         desc->bHubContrCurrent = 0;
 705 
 706         desc->bNbrPorts = ports;
 707         temp = 1 + (ports / 8);
 708         desc->bDescLength = 7 + 2 * temp;
 709 
 710         /* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
 711         memset(&desc->u.hs.DeviceRemovable[0], 0, temp);
 712         memset(&desc->u.hs.DeviceRemovable[temp], 0xff, temp);
 713 
 714         temp = HUB_CHAR_INDV_PORT_OCPM; /* per-port overcurrent reporting */
 715         if (HCS_PPC (ehci->hcs_params))
 716                 temp |= HUB_CHAR_INDV_PORT_LPSM; /* per-port power control */
 717         else
 718                 temp |= HUB_CHAR_NO_LPSM; /* no power switching */
 719 #if 0
 720 // re-enable when we support USB_PORT_FEAT_INDICATOR below.
 721         if (HCS_INDICATOR (ehci->hcs_params))
 722                 temp |= HUB_CHAR_PORTIND; /* per-port indicators (LEDs) */
 723 #endif
 724         desc->wHubCharacteristics = cpu_to_le16(temp);
 725 }
 726 
 727 /*-------------------------------------------------------------------------*/
 728 #ifdef CONFIG_USB_HCD_TEST_MODE
 729 
 730 #define EHSET_TEST_SINGLE_STEP_SET_FEATURE 0x06
 731 
 732 static void usb_ehset_completion(struct urb *urb)
 733 {
 734         struct completion  *done = urb->context;
 735 
 736         complete(done);
 737 }
 738 static int submit_single_step_set_feature(
 739         struct usb_hcd  *hcd,
 740         struct urb      *urb,
 741         int             is_setup
 742 );
 743 
 744 /*
 745  * Allocate and initialize a control URB. This request will be used by the
 746  * EHSET SINGLE_STEP_SET_FEATURE test in which the DATA and STATUS stages
 747  * of the GetDescriptor request are sent 15 seconds after the SETUP stage.
 748  * Return NULL if failed.
 749  */
 750 static struct urb *request_single_step_set_feature_urb(
 751         struct usb_device       *udev,
 752         void                    *dr,
 753         void                    *buf,
 754         struct completion       *done
 755 ) {
 756         struct urb *urb;
 757         struct usb_hcd *hcd = bus_to_hcd(udev->bus);
 758         struct usb_host_endpoint *ep;
 759 
 760         urb = usb_alloc_urb(0, GFP_KERNEL);
 761         if (!urb)
 762                 return NULL;
 763 
 764         urb->pipe = usb_rcvctrlpipe(udev, 0);
 765         ep = (usb_pipein(urb->pipe) ? udev->ep_in : udev->ep_out)
 766                                 [usb_pipeendpoint(urb->pipe)];
 767         if (!ep) {
 768                 usb_free_urb(urb);
 769                 return NULL;
 770         }
 771 
 772         urb->ep = ep;
 773         urb->dev = udev;
 774         urb->setup_packet = (void *)dr;
 775         urb->transfer_buffer = buf;
 776         urb->transfer_buffer_length = USB_DT_DEVICE_SIZE;
 777         urb->complete = usb_ehset_completion;
 778         urb->status = -EINPROGRESS;
 779         urb->actual_length = 0;
 780         urb->transfer_flags = URB_DIR_IN;
 781         usb_get_urb(urb);
 782         atomic_inc(&urb->use_count);
 783         atomic_inc(&urb->dev->urbnum);
 784         urb->setup_dma = dma_map_single(
 785                         hcd->self.sysdev,
 786                         urb->setup_packet,
 787                         sizeof(struct usb_ctrlrequest),
 788                         DMA_TO_DEVICE);
 789         urb->transfer_dma = dma_map_single(
 790                         hcd->self.sysdev,
 791                         urb->transfer_buffer,
 792                         urb->transfer_buffer_length,
 793                         DMA_FROM_DEVICE);
 794         urb->context = done;
 795         return urb;
 796 }
 797 
 798 static int ehset_single_step_set_feature(struct usb_hcd *hcd, int port)
 799 {
 800         int retval = -ENOMEM;
 801         struct usb_ctrlrequest *dr;
 802         struct urb *urb;
 803         struct usb_device *udev;
 804         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 805         struct usb_device_descriptor *buf;
 806         DECLARE_COMPLETION_ONSTACK(done);
 807 
 808         /* Obtain udev of the rhub's child port */
 809         udev = usb_hub_find_child(hcd->self.root_hub, port);
 810         if (!udev) {
 811                 ehci_err(ehci, "No device attached to the RootHub\n");
 812                 return -ENODEV;
 813         }
 814         buf = kmalloc(USB_DT_DEVICE_SIZE, GFP_KERNEL);
 815         if (!buf)
 816                 return -ENOMEM;
 817 
 818         dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
 819         if (!dr) {
 820                 kfree(buf);
 821                 return -ENOMEM;
 822         }
 823 
 824         /* Fill Setup packet for GetDescriptor */
 825         dr->bRequestType = USB_DIR_IN;
 826         dr->bRequest = USB_REQ_GET_DESCRIPTOR;
 827         dr->wValue = cpu_to_le16(USB_DT_DEVICE << 8);
 828         dr->wIndex = 0;
 829         dr->wLength = cpu_to_le16(USB_DT_DEVICE_SIZE);
 830         urb = request_single_step_set_feature_urb(udev, dr, buf, &done);
 831         if (!urb)
 832                 goto cleanup;
 833 
 834         /* Submit just the SETUP stage */
 835         retval = submit_single_step_set_feature(hcd, urb, 1);
 836         if (retval)
 837                 goto out1;
 838         if (!wait_for_completion_timeout(&done, msecs_to_jiffies(2000))) {
 839                 usb_kill_urb(urb);
 840                 retval = -ETIMEDOUT;
 841                 ehci_err(ehci, "%s SETUP stage timed out on ep0\n", __func__);
 842                 goto out1;
 843         }
 844         msleep(15 * 1000);
 845 
 846         /* Complete remaining DATA and STATUS stages using the same URB */
 847         urb->status = -EINPROGRESS;
 848         usb_get_urb(urb);
 849         atomic_inc(&urb->use_count);
 850         atomic_inc(&urb->dev->urbnum);
 851         retval = submit_single_step_set_feature(hcd, urb, 0);
 852         if (!retval && !wait_for_completion_timeout(&done,
 853                                                 msecs_to_jiffies(2000))) {
 854                 usb_kill_urb(urb);
 855                 retval = -ETIMEDOUT;
 856                 ehci_err(ehci, "%s IN stage timed out on ep0\n", __func__);
 857         }
 858 out1:
 859         usb_free_urb(urb);
 860 cleanup:
 861         kfree(dr);
 862         kfree(buf);
 863         return retval;
 864 }
 865 #endif /* CONFIG_USB_HCD_TEST_MODE */
 866 /*-------------------------------------------------------------------------*/
 867 
 868 int ehci_hub_control(
 869         struct usb_hcd  *hcd,
 870         u16             typeReq,
 871         u16             wValue,
 872         u16             wIndex,
 873         char            *buf,
 874         u16             wLength
 875 ) {
 876         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
 877         int             ports = HCS_N_PORTS (ehci->hcs_params);
 878         u32 __iomem     *status_reg, *hostpc_reg;
 879         u32             temp, temp1, status;
 880         unsigned long   flags;
 881         int             retval = 0;
 882         unsigned        selector;
 883 
 884         /*
 885          * Avoid underflow while calculating (wIndex & 0xff) - 1.
 886          * The compiler might deduce that wIndex can never be 0 and then
 887          * optimize away the tests for !wIndex below.
 888          */
 889         temp = wIndex & 0xff;
 890         temp -= (temp > 0);
 891         status_reg = &ehci->regs->port_status[temp];
 892         hostpc_reg = &ehci->regs->hostpc[temp];
 893 
 894         /*
 895          * FIXME:  support SetPortFeatures USB_PORT_FEAT_INDICATOR.
 896          * HCS_INDICATOR may say we can change LEDs to off/amber/green.
 897          * (track current state ourselves) ... blink for diagnostics,
 898          * power, "this is the one", etc.  EHCI spec supports this.
 899          */
 900 
 901         spin_lock_irqsave (&ehci->lock, flags);
 902         switch (typeReq) {
 903         case ClearHubFeature:
 904                 switch (wValue) {
 905                 case C_HUB_LOCAL_POWER:
 906                 case C_HUB_OVER_CURRENT:
 907                         /* no hub-wide feature/status flags */
 908                         break;
 909                 default:
 910                         goto error;
 911                 }
 912                 break;
 913         case ClearPortFeature:
 914                 if (!wIndex || wIndex > ports)
 915                         goto error;
 916                 wIndex--;
 917                 temp = ehci_readl(ehci, status_reg);
 918                 temp &= ~PORT_RWC_BITS;
 919 
 920                 /*
 921                  * Even if OWNER is set, so the port is owned by the
 922                  * companion controller, hub_wq needs to be able to clear
 923                  * the port-change status bits (especially
 924                  * USB_PORT_STAT_C_CONNECTION).
 925                  */
 926 
 927                 switch (wValue) {
 928                 case USB_PORT_FEAT_ENABLE:
 929                         ehci_writel(ehci, temp & ~PORT_PE, status_reg);
 930                         break;
 931                 case USB_PORT_FEAT_C_ENABLE:
 932                         ehci_writel(ehci, temp | PORT_PEC, status_reg);
 933                         break;
 934                 case USB_PORT_FEAT_SUSPEND:
 935                         if (temp & PORT_RESET)
 936                                 goto error;
 937                         if (ehci->no_selective_suspend)
 938                                 break;
 939 #ifdef CONFIG_USB_OTG
 940                         if ((hcd->self.otg_port == (wIndex + 1))
 941                             && hcd->self.b_hnp_enable) {
 942                                 otg_start_hnp(hcd->usb_phy->otg);
 943                                 break;
 944                         }
 945 #endif
 946                         if (!(temp & PORT_SUSPEND))
 947                                 break;
 948                         if ((temp & PORT_PE) == 0)
 949                                 goto error;
 950 
 951                         /* clear phy low-power mode before resume */
 952                         if (ehci->has_tdi_phy_lpm) {
 953                                 temp1 = ehci_readl(ehci, hostpc_reg);
 954                                 ehci_writel(ehci, temp1 & ~HOSTPC_PHCD,
 955                                                 hostpc_reg);
 956                                 spin_unlock_irqrestore(&ehci->lock, flags);
 957                                 msleep(5);/* wait to leave low-power mode */
 958                                 spin_lock_irqsave(&ehci->lock, flags);
 959                         }
 960                         /* resume signaling for 20 msec */
 961                         temp &= ~PORT_WAKE_BITS;
 962                         ehci_writel(ehci, temp | PORT_RESUME, status_reg);
 963                         ehci->reset_done[wIndex] = jiffies
 964                                         + msecs_to_jiffies(USB_RESUME_TIMEOUT);
 965                         set_bit(wIndex, &ehci->resuming_ports);
 966                         usb_hcd_start_port_resume(&hcd->self, wIndex);
 967                         break;
 968                 case USB_PORT_FEAT_C_SUSPEND:
 969                         clear_bit(wIndex, &ehci->port_c_suspend);
 970                         break;
 971                 case USB_PORT_FEAT_POWER:
 972                         if (HCS_PPC(ehci->hcs_params)) {
 973                                 spin_unlock_irqrestore(&ehci->lock, flags);
 974                                 ehci_port_power(ehci, wIndex, false);
 975                                 spin_lock_irqsave(&ehci->lock, flags);
 976                         }
 977                         break;
 978                 case USB_PORT_FEAT_C_CONNECTION:
 979                         ehci_writel(ehci, temp | PORT_CSC, status_reg);
 980                         break;
 981                 case USB_PORT_FEAT_C_OVER_CURRENT:
 982                         ehci_writel(ehci, temp | PORT_OCC, status_reg);
 983                         break;
 984                 case USB_PORT_FEAT_C_RESET:
 985                         /* GetPortStatus clears reset */
 986                         break;
 987                 default:
 988                         goto error;
 989                 }
 990                 ehci_readl(ehci, &ehci->regs->command); /* unblock posted write */
 991                 break;
 992         case GetHubDescriptor:
 993                 ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
 994                         buf);
 995                 break;
 996         case GetHubStatus:
 997                 /* no hub-wide feature/status flags */
 998                 memset (buf, 0, 4);
 999                 //cpu_to_le32s ((u32 *) buf);
1000                 break;
1001         case GetPortStatus:
1002                 if (!wIndex || wIndex > ports)
1003                         goto error;
1004                 wIndex--;
1005                 status = 0;
1006                 temp = ehci_readl(ehci, status_reg);
1007 
1008                 // wPortChange bits
1009                 if (temp & PORT_CSC)
1010                         status |= USB_PORT_STAT_C_CONNECTION << 16;
1011                 if (temp & PORT_PEC)
1012                         status |= USB_PORT_STAT_C_ENABLE << 16;
1013 
1014                 if ((temp & PORT_OCC) && !ignore_oc){
1015                         status |= USB_PORT_STAT_C_OVERCURRENT << 16;
1016 
1017                         /*
1018                          * Hubs should disable port power on over-current.
1019                          * However, not all EHCI implementations do this
1020                          * automatically, even if they _do_ support per-port
1021                          * power switching; they're allowed to just limit the
1022                          * current.  hub_wq will turn the power back on.
1023                          */
1024                         if (((temp & PORT_OC) || (ehci->need_oc_pp_cycle))
1025                                         && HCS_PPC(ehci->hcs_params)) {
1026                                 spin_unlock_irqrestore(&ehci->lock, flags);
1027                                 ehci_port_power(ehci, wIndex, false);
1028                                 spin_lock_irqsave(&ehci->lock, flags);
1029                                 temp = ehci_readl(ehci, status_reg);
1030                         }
1031                 }
1032 
1033                 /* no reset or resume pending */
1034                 if (!ehci->reset_done[wIndex]) {
1035 
1036                         /* Remote Wakeup received? */
1037                         if (temp & PORT_RESUME) {
1038                                 /* resume signaling for 20 msec */
1039                                 ehci->reset_done[wIndex] = jiffies
1040                                                 + msecs_to_jiffies(20);
1041                                 usb_hcd_start_port_resume(&hcd->self, wIndex);
1042                                 set_bit(wIndex, &ehci->resuming_ports);
1043                                 /* check the port again */
1044                                 mod_timer(&ehci_to_hcd(ehci)->rh_timer,
1045                                                 ehci->reset_done[wIndex]);
1046                         }
1047 
1048                 /* reset or resume not yet complete */
1049                 } else if (!time_after_eq(jiffies, ehci->reset_done[wIndex])) {
1050                         ;       /* wait until it is complete */
1051 
1052                 /* resume completed */
1053                 } else if (test_bit(wIndex, &ehci->resuming_ports)) {
1054                         clear_bit(wIndex, &ehci->suspended_ports);
1055                         set_bit(wIndex, &ehci->port_c_suspend);
1056                         ehci->reset_done[wIndex] = 0;
1057                         usb_hcd_end_port_resume(&hcd->self, wIndex);
1058 
1059                         /* stop resume signaling */
1060                         temp &= ~(PORT_RWC_BITS | PORT_SUSPEND | PORT_RESUME);
1061                         ehci_writel(ehci, temp, status_reg);
1062                         clear_bit(wIndex, &ehci->resuming_ports);
1063                         retval = ehci_handshake(ehci, status_reg,
1064                                         PORT_RESUME, 0, 2000 /* 2msec */);
1065                         if (retval != 0) {
1066                                 ehci_err(ehci, "port %d resume error %d\n",
1067                                                 wIndex + 1, retval);
1068                                 goto error;
1069                         }
1070                         temp = ehci_readl(ehci, status_reg);
1071 
1072                 /* whoever resets must GetPortStatus to complete it!! */
1073                 } else {
1074                         status |= USB_PORT_STAT_C_RESET << 16;
1075                         ehci->reset_done [wIndex] = 0;
1076 
1077                         /* force reset to complete */
1078                         ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESET),
1079                                         status_reg);
1080                         /* REVISIT:  some hardware needs 550+ usec to clear
1081                          * this bit; seems too long to spin routinely...
1082                          */
1083                         retval = ehci_handshake(ehci, status_reg,
1084                                         PORT_RESET, 0, 1000);
1085                         if (retval != 0) {
1086                                 ehci_err (ehci, "port %d reset error %d\n",
1087                                         wIndex + 1, retval);
1088                                 goto error;
1089                         }
1090 
1091                         /* see what we found out */
1092                         temp = check_reset_complete (ehci, wIndex, status_reg,
1093                                         ehci_readl(ehci, status_reg));
1094                 }
1095 
1096                 /* transfer dedicated ports to the companion hc */
1097                 if ((temp & PORT_CONNECT) &&
1098                                 test_bit(wIndex, &ehci->companion_ports)) {
1099                         temp &= ~PORT_RWC_BITS;
1100                         temp |= PORT_OWNER;
1101                         ehci_writel(ehci, temp, status_reg);
1102                         ehci_dbg(ehci, "port %d --> companion\n", wIndex + 1);
1103                         temp = ehci_readl(ehci, status_reg);
1104                 }
1105 
1106                 /*
1107                  * Even if OWNER is set, there's no harm letting hub_wq
1108                  * see the wPortStatus values (they should all be 0 except
1109                  * for PORT_POWER anyway).
1110                  */
1111 
1112                 if (temp & PORT_CONNECT) {
1113                         status |= USB_PORT_STAT_CONNECTION;
1114                         // status may be from integrated TT
1115                         if (ehci->has_hostpc) {
1116                                 temp1 = ehci_readl(ehci, hostpc_reg);
1117                                 status |= ehci_port_speed(ehci, temp1);
1118                         } else
1119                                 status |= ehci_port_speed(ehci, temp);
1120                 }
1121                 if (temp & PORT_PE)
1122                         status |= USB_PORT_STAT_ENABLE;
1123 
1124                 /* maybe the port was unsuspended without our knowledge */
1125                 if (temp & (PORT_SUSPEND|PORT_RESUME)) {
1126                         status |= USB_PORT_STAT_SUSPEND;
1127                 } else if (test_bit(wIndex, &ehci->suspended_ports)) {
1128                         clear_bit(wIndex, &ehci->suspended_ports);
1129                         clear_bit(wIndex, &ehci->resuming_ports);
1130                         ehci->reset_done[wIndex] = 0;
1131                         if (temp & PORT_PE)
1132                                 set_bit(wIndex, &ehci->port_c_suspend);
1133                         usb_hcd_end_port_resume(&hcd->self, wIndex);
1134                 }
1135 
1136                 if (temp & PORT_OC)
1137                         status |= USB_PORT_STAT_OVERCURRENT;
1138                 if (temp & PORT_RESET)
1139                         status |= USB_PORT_STAT_RESET;
1140                 if (temp & PORT_POWER)
1141                         status |= USB_PORT_STAT_POWER;
1142                 if (test_bit(wIndex, &ehci->port_c_suspend))
1143                         status |= USB_PORT_STAT_C_SUSPEND << 16;
1144 
1145                 if (status & ~0xffff)   /* only if wPortChange is interesting */
1146                         dbg_port(ehci, "GetStatus", wIndex + 1, temp);
1147                 put_unaligned_le32(status, buf);
1148                 break;
1149         case SetHubFeature:
1150                 switch (wValue) {
1151                 case C_HUB_LOCAL_POWER:
1152                 case C_HUB_OVER_CURRENT:
1153                         /* no hub-wide feature/status flags */
1154                         break;
1155                 default:
1156                         goto error;
1157                 }
1158                 break;
1159         case SetPortFeature:
1160                 selector = wIndex >> 8;
1161                 wIndex &= 0xff;
1162                 if (unlikely(ehci->debug)) {
1163                         /* If the debug port is active any port
1164                          * feature requests should get denied */
1165                         if (wIndex == HCS_DEBUG_PORT(ehci->hcs_params) &&
1166                             (readl(&ehci->debug->control) & DBGP_ENABLED)) {
1167                                 retval = -ENODEV;
1168                                 goto error_exit;
1169                         }
1170                 }
1171                 if (!wIndex || wIndex > ports)
1172                         goto error;
1173                 wIndex--;
1174                 temp = ehci_readl(ehci, status_reg);
1175                 if (temp & PORT_OWNER)
1176                         break;
1177 
1178                 temp &= ~PORT_RWC_BITS;
1179                 switch (wValue) {
1180                 case USB_PORT_FEAT_SUSPEND:
1181                         if (ehci->no_selective_suspend)
1182                                 break;
1183                         if ((temp & PORT_PE) == 0
1184                                         || (temp & PORT_RESET) != 0)
1185                                 goto error;
1186 
1187                         /* After above check the port must be connected.
1188                          * Set appropriate bit thus could put phy into low power
1189                          * mode if we have tdi_phy_lpm feature
1190                          */
1191                         temp &= ~PORT_WKCONN_E;
1192                         temp |= PORT_WKDISC_E | PORT_WKOC_E;
1193                         ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
1194                         if (ehci->has_tdi_phy_lpm) {
1195                                 spin_unlock_irqrestore(&ehci->lock, flags);
1196                                 msleep(5);/* 5ms for HCD enter low pwr mode */
1197                                 spin_lock_irqsave(&ehci->lock, flags);
1198                                 temp1 = ehci_readl(ehci, hostpc_reg);
1199                                 ehci_writel(ehci, temp1 | HOSTPC_PHCD,
1200                                         hostpc_reg);
1201                                 temp1 = ehci_readl(ehci, hostpc_reg);
1202                                 ehci_dbg(ehci, "Port%d phy low pwr mode %s\n",
1203                                         wIndex, (temp1 & HOSTPC_PHCD) ?
1204                                         "succeeded" : "failed");
1205                         }
1206                         if (ehci_has_fsl_susp_errata(ehci)) {
1207                                 /* 10ms for HCD enter suspend */
1208                                 spin_unlock_irqrestore(&ehci->lock, flags);
1209                                 usleep_range(10000, 20000);
1210                                 spin_lock_irqsave(&ehci->lock, flags);
1211                         }
1212                         set_bit(wIndex, &ehci->suspended_ports);
1213                         break;
1214                 case USB_PORT_FEAT_POWER:
1215                         if (HCS_PPC(ehci->hcs_params)) {
1216                                 spin_unlock_irqrestore(&ehci->lock, flags);
1217                                 ehci_port_power(ehci, wIndex, true);
1218                                 spin_lock_irqsave(&ehci->lock, flags);
1219                         }
1220                         break;
1221                 case USB_PORT_FEAT_RESET:
1222                         if (temp & (PORT_SUSPEND|PORT_RESUME))
1223                                 goto error;
1224                         /* line status bits may report this as low speed,
1225                          * which can be fine if this root hub has a
1226                          * transaction translator built in.
1227                          */
1228                         if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
1229                                         && !ehci_is_TDI(ehci)
1230                                         && PORT_USB11 (temp)) {
1231                                 ehci_dbg (ehci,
1232                                         "port %d low speed --> companion\n",
1233                                         wIndex + 1);
1234                                 temp |= PORT_OWNER;
1235                         } else {
1236                                 temp |= PORT_RESET;
1237                                 temp &= ~PORT_PE;
1238 
1239                                 /*
1240                                  * caller must wait, then call GetPortStatus
1241                                  * usb 2.0 spec says 50 ms resets on root
1242                                  */
1243                                 ehci->reset_done [wIndex] = jiffies
1244                                                 + msecs_to_jiffies (50);
1245 
1246                                 /*
1247                                  * Force full-speed connect for FSL high-speed
1248                                  * erratum; disable HS Chirp by setting PFSC bit
1249                                  */
1250                                 if (ehci_has_fsl_hs_errata(ehci))
1251                                         temp |= (1 << PORTSC_FSL_PFSC);
1252                         }
1253                         ehci_writel(ehci, temp, status_reg);
1254                         break;
1255 
1256                 /* For downstream facing ports (these):  one hub port is put
1257                  * into test mode according to USB2 11.24.2.13, then the hub
1258                  * must be reset (which for root hub now means rmmod+modprobe,
1259                  * or else system reboot).  See EHCI 2.3.9 and 4.14 for info
1260                  * about the EHCI-specific stuff.
1261                  */
1262                 case USB_PORT_FEAT_TEST:
1263 #ifdef CONFIG_USB_HCD_TEST_MODE
1264                         if (selector == EHSET_TEST_SINGLE_STEP_SET_FEATURE) {
1265                                 spin_unlock_irqrestore(&ehci->lock, flags);
1266                                 retval = ehset_single_step_set_feature(hcd,
1267                                                                 wIndex + 1);
1268                                 spin_lock_irqsave(&ehci->lock, flags);
1269                                 break;
1270                         }
1271 #endif
1272                         if (!selector || selector > 5)
1273                                 goto error;
1274                         spin_unlock_irqrestore(&ehci->lock, flags);
1275                         ehci_quiesce(ehci);
1276                         spin_lock_irqsave(&ehci->lock, flags);
1277 
1278                         /* Put all enabled ports into suspend */
1279                         while (ports--) {
1280                                 u32 __iomem *sreg =
1281                                                 &ehci->regs->port_status[ports];
1282 
1283                                 temp = ehci_readl(ehci, sreg) & ~PORT_RWC_BITS;
1284                                 if (temp & PORT_PE)
1285                                         ehci_writel(ehci, temp | PORT_SUSPEND,
1286                                                         sreg);
1287                         }
1288 
1289                         spin_unlock_irqrestore(&ehci->lock, flags);
1290                         ehci_halt(ehci);
1291                         spin_lock_irqsave(&ehci->lock, flags);
1292 
1293                         temp = ehci_readl(ehci, status_reg);
1294                         temp |= selector << 16;
1295                         ehci_writel(ehci, temp, status_reg);
1296                         break;
1297 
1298                 default:
1299                         goto error;
1300                 }
1301                 ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
1302                 break;
1303 
1304         default:
1305 error:
1306                 /* "stall" on error */
1307                 retval = -EPIPE;
1308         }
1309 error_exit:
1310         spin_unlock_irqrestore (&ehci->lock, flags);
1311         return retval;
1312 }
1313 EXPORT_SYMBOL_GPL(ehci_hub_control);
1314 
1315 static void ehci_relinquish_port(struct usb_hcd *hcd, int portnum)
1316 {
1317         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1318 
1319         if (ehci_is_TDI(ehci))
1320                 return;
1321         set_owner(ehci, --portnum, PORT_OWNER);
1322 }
1323 
1324 static int ehci_port_handed_over(struct usb_hcd *hcd, int portnum)
1325 {
1326         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1327         u32 __iomem             *reg;
1328 
1329         if (ehci_is_TDI(ehci))
1330                 return 0;
1331         reg = &ehci->regs->port_status[portnum - 1];
1332         return ehci_readl(ehci, reg) & PORT_OWNER;
1333 }
1334 
1335 static int ehci_port_power(struct ehci_hcd *ehci, int portnum, bool enable)
1336 {
1337         struct usb_hcd *hcd = ehci_to_hcd(ehci);
1338         u32 __iomem *status_reg = &ehci->regs->port_status[portnum];
1339         u32 temp = ehci_readl(ehci, status_reg) & ~PORT_RWC_BITS;
1340 
1341         if (enable)
1342                 ehci_writel(ehci, temp | PORT_POWER, status_reg);
1343         else
1344                 ehci_writel(ehci, temp & ~PORT_POWER, status_reg);
1345 
1346         if (hcd->driver->port_power)
1347                 hcd->driver->port_power(hcd, portnum, enable);
1348 
1349         return 0;
1350 }
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/usb/host/ehci-hub.c

DEFINITIONS
