drivers/usb/host/ohci-hub.c

   1 /*
   2  * OHCI HCD (Host Controller Driver) for USB.
   3  *
   4  * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
   5  * (C) Copyright 2000-2004 David Brownell <dbrownell@users.sourceforge.net>
   6  *
   7  * This file is licenced under GPL
   8  */
   9
  10 /*-------------------------------------------------------------------------*/
  11
  12 /*
  13  * OHCI Root Hub ... the nonsharable stuff
  14  */
  15
  16 #define dbg_port(hc,label,num,value) \
  17         ohci_dbg (hc, \
  18                 "%s roothub.portstatus [%d] " \
  19                 "= 0x%08x%s%s%s%s%s%s%s%s%s%s%s%s\n", \
  20                 label, num, temp, \
  21                 (temp & RH_PS_PRSC) ? " PRSC" : "", \
  22                 (temp & RH_PS_OCIC) ? " OCIC" : "", \
  23                 (temp & RH_PS_PSSC) ? " PSSC" : "", \
  24                 (temp & RH_PS_PESC) ? " PESC" : "", \
  25                 (temp & RH_PS_CSC) ? " CSC" : "", \
  26                 \
  27                 (temp & RH_PS_LSDA) ? " LSDA" : "", \
  28                 (temp & RH_PS_PPS) ? " PPS" : "", \
  29                 (temp & RH_PS_PRS) ? " PRS" : "", \
  30                 (temp & RH_PS_POCI) ? " POCI" : "", \
  31                 (temp & RH_PS_PSS) ? " PSS" : "", \
  32                 \
  33                 (temp & RH_PS_PES) ? " PES" : "", \
  34                 (temp & RH_PS_CCS) ? " CCS" : "" \
  35                 );
  36
  37 /*-------------------------------------------------------------------------*/
  38
  39 #define OHCI_SCHED_ENABLES \
  40         (OHCI_CTRL_CLE|OHCI_CTRL_BLE|OHCI_CTRL_PLE|OHCI_CTRL_IE)
  41
  42 static void update_done_list(struct ohci_hcd *);
  43 static void ohci_work(struct ohci_hcd *);
  44
  45 #ifdef  CONFIG_PM
  46 static int ohci_rh_suspend (struct ohci_hcd *ohci, int autostop)
  47 __releases(ohci->lock)
  48 __acquires(ohci->lock)
  49 {
  50         int                     status = 0;
  51
  52         ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
  53         switch (ohci->hc_control & OHCI_CTRL_HCFS) {
  54         case OHCI_USB_RESUME:
  55                 ohci_dbg (ohci, "resume/suspend?\n");
  56                 ohci->hc_control &= ~OHCI_CTRL_HCFS;
  57                 ohci->hc_control |= OHCI_USB_RESET;
  58                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
  59                 (void) ohci_readl (ohci, &ohci->regs->control);
  60                 /* FALL THROUGH */
  61         case OHCI_USB_RESET:
  62                 status = -EBUSY;
  63                 ohci_dbg (ohci, "needs reinit!\n");
  64                 goto done;
  65         case OHCI_USB_SUSPEND:
  66                 if (!ohci->autostop) {
  67                         ohci_dbg (ohci, "already suspended\n");
  68                         goto done;
  69                 }
  70         }
  71         ohci_dbg (ohci, "%s root hub\n",
  72                         autostop ? "auto-stop" : "suspend");
  73
  74         /* First stop any processing */
  75         if (!autostop && (ohci->hc_control & OHCI_SCHED_ENABLES)) {
  76                 ohci->hc_control &= ~OHCI_SCHED_ENABLES;
  77                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
  78                 ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
  79                 ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrstatus);
  80
  81                 /* sched disables take effect on the next frame,
  82                  * then the last WDH could take 6+ msec
  83                  */
  84                 ohci_dbg (ohci, "stopping schedules ...\n");
  85                 ohci->autostop = 0;
  86                 spin_unlock_irq (&ohci->lock);
  87                 msleep (8);
  88                 spin_lock_irq (&ohci->lock);
  89         }
  90         update_done_list(ohci);
  91         ohci_work(ohci);
  92
  93         /*
  94          * Some controllers don't handle "global" suspend properly if
  95          * there are unsuspended ports.  For these controllers, put all
  96          * the enabled ports into suspend before suspending the root hub.
  97          */
  98         if (ohci->flags & OHCI_QUIRK_GLOBAL_SUSPEND) {
  99                 __hc32 __iomem  *portstat = ohci->regs->roothub.portstatus;
 100                 int             i;
 101                 unsigned        temp;
 102
 103                 for (i = 0; i < ohci->num_ports; (++i, ++portstat)) {
 104                         temp = ohci_readl(ohci, portstat);
 105                         if ((temp & (RH_PS_PES | RH_PS_PSS)) ==
 106                                         RH_PS_PES)
 107                                 ohci_writel(ohci, RH_PS_PSS, portstat);
 108                 }
 109         }
 110
 111         /* maybe resume can wake root hub */
 112         if (ohci_to_hcd(ohci)->self.root_hub->do_remote_wakeup || autostop) {
 113                 ohci->hc_control |= OHCI_CTRL_RWE;
 114         } else {
 115                 ohci_writel(ohci, OHCI_INTR_RHSC | OHCI_INTR_RD,
 116                                 &ohci->regs->intrdisable);
 117                 ohci->hc_control &= ~OHCI_CTRL_RWE;
 118         }
 119
 120         /* Suspend hub ... this is the "global (to this bus) suspend" mode,
 121          * which doesn't imply ports will first be individually suspended.
 122          */
 123         ohci->hc_control &= ~OHCI_CTRL_HCFS;
 124         ohci->hc_control |= OHCI_USB_SUSPEND;
 125         ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 126         (void) ohci_readl (ohci, &ohci->regs->control);
 127
 128         /* no resumes until devices finish suspending */
 129         if (!autostop) {
 130                 ohci->next_statechange = jiffies + msecs_to_jiffies (5);
 131                 ohci->autostop = 0;
 132                 ohci->rh_state = OHCI_RH_SUSPENDED;
 133         }
 134
 135 done:
 136         return status;
 137 }
 138
 139 static inline struct ed *find_head (struct ed *ed)
 140 {
 141         /* for bulk and control lists */
 142         while (ed->ed_prev)
 143                 ed = ed->ed_prev;
 144         return ed;
 145 }
 146
 147 /* caller has locked the root hub */
 148 static int ohci_rh_resume (struct ohci_hcd *ohci)
 149 __releases(ohci->lock)
 150 __acquires(ohci->lock)
 151 {
 152         struct usb_hcd          *hcd = ohci_to_hcd (ohci);
 153         u32                     temp, enables;
 154         int                     status = -EINPROGRESS;
 155         int                     autostopped = ohci->autostop;
 156
 157         ohci->autostop = 0;
 158         ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
 159
 160         if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) {
 161                 /* this can happen after resuming a swsusp snapshot */
 162                 if (ohci->rh_state != OHCI_RH_RUNNING) {
 163                         ohci_dbg (ohci, "BIOS/SMM active, control %03x\n",
 164                                         ohci->hc_control);
 165                         status = -EBUSY;
 166                 /* this happens when pmcore resumes HC then root */
 167                 } else {
 168                         ohci_dbg (ohci, "duplicate resume\n");
 169                         status = 0;
 170                 }
 171         } else switch (ohci->hc_control & OHCI_CTRL_HCFS) {
 172         case OHCI_USB_SUSPEND:
 173                 ohci->hc_control &= ~(OHCI_CTRL_HCFS|OHCI_SCHED_ENABLES);
 174                 ohci->hc_control |= OHCI_USB_RESUME;
 175                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 176                 (void) ohci_readl (ohci, &ohci->regs->control);
 177                 ohci_dbg (ohci, "%s root hub\n",
 178                                 autostopped ? "auto-start" : "resume");
 179                 break;
 180         case OHCI_USB_RESUME:
 181                 /* HCFS changes sometime after INTR_RD */
 182                 ohci_dbg(ohci, "%swakeup root hub\n",
 183                                 autostopped ? "auto-" : "");
 184                 break;
 185         case OHCI_USB_OPER:
 186                 /* this can happen after resuming a swsusp snapshot */
 187                 ohci_dbg (ohci, "snapshot resume? reinit\n");
 188                 status = -EBUSY;
 189                 break;
 190         default:                /* RESET, we lost power */
 191                 ohci_dbg (ohci, "lost power\n");
 192                 status = -EBUSY;
 193         }
 194         if (status == -EBUSY) {
 195                 if (!autostopped) {
 196                         spin_unlock_irq (&ohci->lock);
 197                         status = ohci_restart (ohci);
 198
 199                         usb_root_hub_lost_power(hcd->self.root_hub);
 200
 201                         spin_lock_irq (&ohci->lock);
 202                 }
 203                 return status;
 204         }
 205         if (status != -EINPROGRESS)
 206                 return status;
 207         if (autostopped)
 208                 goto skip_resume;
 209         spin_unlock_irq (&ohci->lock);
 210
 211         /* Some controllers (lucent erratum) need extra-long delays */
 212         msleep (20 /* usb 11.5.1.10 */ + 12 /* 32 msec counter */ + 1);
 213
 214         temp = ohci_readl (ohci, &ohci->regs->control);
 215         temp &= OHCI_CTRL_HCFS;
 216         if (temp != OHCI_USB_RESUME) {
 217                 ohci_err (ohci, "controller won't resume\n");
 218                 spin_lock_irq(&ohci->lock);
 219                 return -EBUSY;
 220         }
 221
 222         /* disable old schedule state, reinit from scratch */
 223         ohci_writel (ohci, 0, &ohci->regs->ed_controlhead);
 224         ohci_writel (ohci, 0, &ohci->regs->ed_controlcurrent);
 225         ohci_writel (ohci, 0, &ohci->regs->ed_bulkhead);
 226         ohci_writel (ohci, 0, &ohci->regs->ed_bulkcurrent);
 227         ohci_writel (ohci, 0, &ohci->regs->ed_periodcurrent);
 228         ohci_writel (ohci, (u32) ohci->hcca_dma, &ohci->regs->hcca);
 229
 230         /* Sometimes PCI D3 suspend trashes frame timings ... */
 231         periodic_reinit (ohci);
 232
 233         /*
 234          * The following code is executed with ohci->lock held and
 235          * irqs disabled if and only if autostopped is true.  This
 236          * will cause sparse to warn about a "context imbalance".
 237          */
 238 skip_resume:
 239         /* interrupts might have been disabled */
 240         ohci_writel (ohci, OHCI_INTR_INIT, &ohci->regs->intrenable);
 241         if (ohci->ed_rm_list)
 242                 ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrenable);
 243
 244         /* Then re-enable operations */
 245         ohci_writel (ohci, OHCI_USB_OPER, &ohci->regs->control);
 246         (void) ohci_readl (ohci, &ohci->regs->control);
 247         if (!autostopped)
 248                 msleep (3);
 249
 250         temp = ohci->hc_control;
 251         temp &= OHCI_CTRL_RWC;
 252         temp |= OHCI_CONTROL_INIT | OHCI_USB_OPER;
 253         ohci->hc_control = temp;
 254         ohci_writel (ohci, temp, &ohci->regs->control);
 255         (void) ohci_readl (ohci, &ohci->regs->control);
 256
 257         /* TRSMRCY */
 258         if (!autostopped) {
 259                 msleep (10);
 260                 spin_lock_irq (&ohci->lock);
 261         }
 262         /* now ohci->lock is always held and irqs are always disabled */
 263
 264         /* keep it alive for more than ~5x suspend + resume costs */
 265         ohci->next_statechange = jiffies + STATECHANGE_DELAY;
 266
 267         /* maybe turn schedules back on */
 268         enables = 0;
 269         temp = 0;
 270         if (!ohci->ed_rm_list) {
 271                 if (ohci->ed_controltail) {
 272                         ohci_writel (ohci,
 273                                         find_head (ohci->ed_controltail)->dma,
 274                                         &ohci->regs->ed_controlhead);
 275                         enables |= OHCI_CTRL_CLE;
 276                         temp |= OHCI_CLF;
 277                 }
 278                 if (ohci->ed_bulktail) {
 279                         ohci_writel (ohci, find_head (ohci->ed_bulktail)->dma,
 280                                 &ohci->regs->ed_bulkhead);
 281                         enables |= OHCI_CTRL_BLE;
 282                         temp |= OHCI_BLF;
 283                 }
 284         }
 285         if (hcd->self.bandwidth_isoc_reqs || hcd->self.bandwidth_int_reqs)
 286                 enables |= OHCI_CTRL_PLE|OHCI_CTRL_IE;
 287         if (enables) {
 288                 ohci_dbg (ohci, "restarting schedules ... %08x\n", enables);
 289                 ohci->hc_control |= enables;
 290                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 291                 if (temp)
 292                         ohci_writel (ohci, temp, &ohci->regs->cmdstatus);
 293                 (void) ohci_readl (ohci, &ohci->regs->control);
 294         }
 295
 296         ohci->rh_state = OHCI_RH_RUNNING;
 297         return 0;
 298 }
 299
 300 static int ohci_bus_suspend (struct usb_hcd *hcd)
 301 {
 302         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
 303         int                     rc;
 304
 305         spin_lock_irq (&ohci->lock);
 306
 307         if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
 308                 rc = -ESHUTDOWN;
 309         else
 310                 rc = ohci_rh_suspend (ohci, 0);
 311         spin_unlock_irq (&ohci->lock);
 312
 313         if (rc == 0) {
 314                 del_timer_sync(&ohci->io_watchdog);
 315                 ohci->prev_frame_no = IO_WATCHDOG_OFF;
 316         }
 317         return rc;
 318 }
 319
 320 static int ohci_bus_resume (struct usb_hcd *hcd)
 321 {
 322         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
 323         int                     rc;
 324
 325         if (time_before (jiffies, ohci->next_statechange))
 326                 msleep(5);
 327
 328         spin_lock_irq (&ohci->lock);
 329
 330         if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
 331                 rc = -ESHUTDOWN;
 332         else
 333                 rc = ohci_rh_resume (ohci);
 334         spin_unlock_irq (&ohci->lock);
 335
 336         /* poll until we know a device is connected or we autostop */
 337         if (rc == 0)
 338                 usb_hcd_poll_rh_status(hcd);
 339         return rc;
 340 }
 341
 342 /* Carry out polling-, autostop-, and autoresume-related state changes */
 343 static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
 344                 int any_connected, int rhsc_status)
 345 {
 346         int     poll_rh = 1;
 347         int     rhsc_enable;
 348
 349         /* Some broken controllers never turn off RHSC in the interrupt
 350          * status register.  For their sake we won't re-enable RHSC
 351          * interrupts if the interrupt bit is already active.
 352          */
 353         rhsc_enable = ohci_readl(ohci, &ohci->regs->intrenable) &
 354                         OHCI_INTR_RHSC;
 355
 356         switch (ohci->hc_control & OHCI_CTRL_HCFS) {
 357         case OHCI_USB_OPER:
 358                 /* If no status changes are pending, enable RHSC interrupts. */
 359                 if (!rhsc_enable && !rhsc_status && !changed) {
 360                         rhsc_enable = OHCI_INTR_RHSC;
 361                         ohci_writel(ohci, rhsc_enable, &ohci->regs->intrenable);
 362                 }
 363
 364                 /* Keep on polling until we know a device is connected
 365                  * and RHSC is enabled, or until we autostop.
 366                  */
 367                 if (!ohci->autostop) {
 368                         if (any_connected ||
 369                                         !device_may_wakeup(&ohci_to_hcd(ohci)
 370                                                 ->self.root_hub->dev)) {
 371                                 if (rhsc_enable)
 372                                         poll_rh = 0;
 373                         } else {
 374                                 ohci->autostop = 1;
 375                                 ohci->next_statechange = jiffies + HZ;
 376                         }
 377
 378                 /* if no devices have been attached for one second, autostop */
 379                 } else {
 380                         if (changed || any_connected) {
 381                                 ohci->autostop = 0;
 382                                 ohci->next_statechange = jiffies +
 383                                                 STATECHANGE_DELAY;
 384                         } else if (time_after_eq(jiffies,
 385                                                 ohci->next_statechange)
 386                                         && !ohci->ed_rm_list
 387                                         && !(ohci->hc_control &
 388                                                 OHCI_SCHED_ENABLES)) {
 389                                 ohci_rh_suspend(ohci, 1);
 390                                 if (rhsc_enable)
 391                                         poll_rh = 0;
 392                         }
 393                 }
 394                 break;
 395
 396         case OHCI_USB_SUSPEND:
 397         case OHCI_USB_RESUME:
 398                 /* if there is a port change, autostart or ask to be resumed */
 399                 if (changed) {
 400                         if (ohci->autostop)
 401                                 ohci_rh_resume(ohci);
 402                         else
 403                                 usb_hcd_resume_root_hub(ohci_to_hcd(ohci));
 404
 405                 /* If remote wakeup is disabled, stop polling */
 406                 } else if (!ohci->autostop &&
 407                                 !ohci_to_hcd(ohci)->self.root_hub->
 408                                         do_remote_wakeup) {
 409                         poll_rh = 0;
 410
 411                 } else {
 412                         /* If no status changes are pending,
 413                          * enable RHSC interrupts
 414                          */
 415                         if (!rhsc_enable && !rhsc_status) {
 416                                 rhsc_enable = OHCI_INTR_RHSC;
 417                                 ohci_writel(ohci, rhsc_enable,
 418                                                 &ohci->regs->intrenable);
 419                         }
 420                         /* Keep polling until RHSC is enabled */
 421                         if (rhsc_enable)
 422                                 poll_rh = 0;
 423                 }
 424                 break;
 425         }
 426         return poll_rh;
 427 }
 428
 429 #else   /* CONFIG_PM */
 430
 431 static inline int ohci_rh_resume(struct ohci_hcd *ohci)
 432 {
 433         return 0;
 434 }
 435
 436 /* Carry out polling-related state changes.
 437  * autostop isn't used when CONFIG_PM is turned off.
 438  */
 439 static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
 440                 int any_connected, int rhsc_status)
 441 {
 442         /* If RHSC is enabled, don't poll */
 443         if (ohci_readl(ohci, &ohci->regs->intrenable) & OHCI_INTR_RHSC)
 444                 return 0;
 445
 446         /* If status changes are pending, continue polling.
 447          * Conversely, if no status changes are pending but the RHSC
 448          * status bit was set, then RHSC may be broken so continue polling.
 449          */
 450         if (changed || rhsc_status)
 451                 return 1;
 452
 453         /* It's safe to re-enable RHSC interrupts */
 454         ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrenable);
 455         return 0;
 456 }
 457
 458 #endif  /* CONFIG_PM */
 459
 460 /*-------------------------------------------------------------------------*/
 461
 462 /* build "status change" packet (one or two bytes) from HC registers */
 463
 464 int ohci_hub_status_data(struct usb_hcd *hcd, char *buf)
 465 {
 466         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 467         int             i, changed = 0, length = 1;
 468         int             any_connected = 0;
 469         int             rhsc_status;
 470         unsigned long   flags;
 471
 472         spin_lock_irqsave (&ohci->lock, flags);
 473         if (!HCD_HW_ACCESSIBLE(hcd))
 474                 goto done;
 475
 476         /* undocumented erratum seen on at least rev D */
 477         if ((ohci->flags & OHCI_QUIRK_AMD756)
 478                         && (roothub_a (ohci) & RH_A_NDP) > MAX_ROOT_PORTS) {
 479                 ohci_warn (ohci, "bogus NDP, rereads as NDP=%d\n",
 480                           ohci_readl (ohci, &ohci->regs->roothub.a) & RH_A_NDP);
 481                 /* retry later; "should not happen" */
 482                 goto done;
 483         }
 484
 485         /* init status */
 486         if (roothub_status (ohci) & (RH_HS_LPSC | RH_HS_OCIC))
 487                 buf [0] = changed = 1;
 488         else
 489                 buf [0] = 0;
 490         if (ohci->num_ports > 7) {
 491                 buf [1] = 0;
 492                 length++;
 493         }
 494
 495         /* Clear the RHSC status flag before reading the port statuses */
 496         ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrstatus);
 497         rhsc_status = ohci_readl(ohci, &ohci->regs->intrstatus) &
 498                         OHCI_INTR_RHSC;
 499
 500         /* look at each port */
 501         for (i = 0; i < ohci->num_ports; i++) {
 502                 u32     status = roothub_portstatus (ohci, i);
 503
 504                 /* can't autostop if ports are connected */
 505                 any_connected |= (status & RH_PS_CCS);
 506
 507                 if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC
 508                                 | RH_PS_OCIC | RH_PS_PRSC)) {
 509                         changed = 1;
 510                         if (i < 7)
 511                             buf [0] |= 1 << (i + 1);
 512                         else
 513                             buf [1] |= 1 << (i - 7);
 514                 }
 515         }
 516
 517         if (ohci_root_hub_state_changes(ohci, changed,
 518                         any_connected, rhsc_status))
 519                 set_bit(HCD_FLAG_POLL_RH, &hcd->flags);
 520         else
 521                 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
 522
 523
 524 done:
 525         spin_unlock_irqrestore (&ohci->lock, flags);
 526
 527         return changed ? length : 0;
 528 }
 529 EXPORT_SYMBOL_GPL(ohci_hub_status_data);
 530
 531 /*-------------------------------------------------------------------------*/
 532
 533 static void
 534 ohci_hub_descriptor (
 535         struct ohci_hcd                 *ohci,
 536         struct usb_hub_descriptor       *desc
 537 ) {
 538         u32             rh = roothub_a (ohci);
 539         u16             temp;
 540
 541         desc->bDescriptorType = USB_DT_HUB;
 542         desc->bPwrOn2PwrGood = (rh & RH_A_POTPGT) >> 24;
 543         desc->bHubContrCurrent = 0;
 544
 545         desc->bNbrPorts = ohci->num_ports;
 546         temp = 1 + (ohci->num_ports / 8);
 547         desc->bDescLength = 7 + 2 * temp;
 548
 549         temp = HUB_CHAR_COMMON_LPSM | HUB_CHAR_COMMON_OCPM;
 550         if (rh & RH_A_NPS)              /* no power switching? */
 551                 temp |= HUB_CHAR_NO_LPSM;
 552         if (rh & RH_A_PSM)              /* per-port power switching? */
 553                 temp |= HUB_CHAR_INDV_PORT_LPSM;
 554         if (rh & RH_A_NOCP)             /* no overcurrent reporting? */
 555                 temp |= HUB_CHAR_NO_OCPM;
 556         else if (rh & RH_A_OCPM)        /* per-port overcurrent reporting? */
 557                 temp |= HUB_CHAR_INDV_PORT_OCPM;
 558         desc->wHubCharacteristics = cpu_to_le16(temp);
 559
 560         /* ports removable, and usb 1.0 legacy PortPwrCtrlMask */
 561         rh = roothub_b (ohci);
 562         memset(desc->u.hs.DeviceRemovable, 0xff,
 563                         sizeof(desc->u.hs.DeviceRemovable));
 564         desc->u.hs.DeviceRemovable[0] = rh & RH_B_DR;
 565         if (ohci->num_ports > 7) {
 566                 desc->u.hs.DeviceRemovable[1] = (rh & RH_B_DR) >> 8;
 567                 desc->u.hs.DeviceRemovable[2] = 0xff;
 568         } else
 569                 desc->u.hs.DeviceRemovable[1] = 0xff;
 570 }
 571
 572 /*-------------------------------------------------------------------------*/
 573
 574 #ifdef  CONFIG_USB_OTG
 575
 576 static int ohci_start_port_reset (struct usb_hcd *hcd, unsigned port)
 577 {
 578         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 579         u32                     status;
 580
 581         if (!port)
 582                 return -EINVAL;
 583         port--;
 584
 585         /* start port reset before HNP protocol times out */
 586         status = ohci_readl(ohci, &ohci->regs->roothub.portstatus [port]);
 587         if (!(status & RH_PS_CCS))
 588                 return -ENODEV;
 589
 590         /* hub_wq will finish the reset later */
 591         ohci_writel(ohci, RH_PS_PRS, &ohci->regs->roothub.portstatus [port]);
 592         return 0;
 593 }
 594
 595 #else
 596
 597 #define ohci_start_port_reset           NULL
 598
 599 #endif
 600
 601 /*-------------------------------------------------------------------------*/
 602
 603
 604 /* See usb 7.1.7.5:  root hubs must issue at least 50 msec reset signaling,
 605  * not necessarily continuous ... to guard against resume signaling.
 606  */
 607 #define PORT_RESET_MSEC         50
 608
 609 /* this timer value might be vendor-specific ... */
 610 #define PORT_RESET_HW_MSEC      10
 611
 612 /* wrap-aware logic morphed from <linux/jiffies.h> */
 613 #define tick_before(t1,t2) ((s16)(((s16)(t1))-((s16)(t2))) < 0)
 614
 615 /* called from some task, normally hub_wq */
 616 static inline int root_port_reset (struct ohci_hcd *ohci, unsigned port)
 617 {
 618         __hc32 __iomem *portstat = &ohci->regs->roothub.portstatus [port];
 619         u32     temp = 0;
 620         u16     now = ohci_readl(ohci, &ohci->regs->fmnumber);
 621         u16     reset_done = now + PORT_RESET_MSEC;
 622         int     limit_1 = DIV_ROUND_UP(PORT_RESET_MSEC, PORT_RESET_HW_MSEC);
 623
 624         /* build a "continuous enough" reset signal, with up to
 625          * 3msec gap between pulses.  scheduler HZ==100 must work;
 626          * this might need to be deadline-scheduled.
 627          */
 628         do {
 629                 int limit_2;
 630
 631                 /* spin until any current reset finishes */
 632                 limit_2 = PORT_RESET_HW_MSEC * 2;
 633                 while (--limit_2 >= 0) {
 634                         temp = ohci_readl (ohci, portstat);
 635                         /* handle e.g. CardBus eject */
 636                         if (temp == ~(u32)0)
 637                                 return -ESHUTDOWN;
 638                         if (!(temp & RH_PS_PRS))
 639                                 break;
 640                         udelay (500);
 641                 }
 642
 643                 /* timeout (a hardware error) has been observed when
 644                  * EHCI sets CF while this driver is resetting a port;
 645                  * presumably other disconnect paths might do it too.
 646                  */
 647                 if (limit_2 < 0) {
 648                         ohci_dbg(ohci,
 649                                 "port[%d] reset timeout, stat %08x\n",
 650                                 port, temp);
 651                         break;
 652                 }
 653
 654                 if (!(temp & RH_PS_CCS))
 655                         break;
 656                 if (temp & RH_PS_PRSC)
 657                         ohci_writel (ohci, RH_PS_PRSC, portstat);
 658
 659                 /* start the next reset, sleep till it's probably done */
 660                 ohci_writel (ohci, RH_PS_PRS, portstat);
 661                 msleep(PORT_RESET_HW_MSEC);
 662                 now = ohci_readl(ohci, &ohci->regs->fmnumber);
 663         } while (tick_before(now, reset_done) && --limit_1 >= 0);
 664
 665         /* caller synchronizes using PRSC ... and handles PRS
 666          * still being set when this returns.
 667          */
 668
 669         return 0;
 670 }
 671
 672 int ohci_hub_control(
 673         struct usb_hcd  *hcd,
 674         u16             typeReq,
 675         u16             wValue,
 676         u16             wIndex,
 677         char            *buf,
 678         u16             wLength
 679 ) {
 680         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 681         int             ports = ohci->num_ports;
 682         u32             temp;
 683         int             retval = 0;
 684
 685         if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
 686                 return -ESHUTDOWN;
 687
 688         switch (typeReq) {
 689         case ClearHubFeature:
 690                 switch (wValue) {
 691                 case C_HUB_OVER_CURRENT:
 692                         ohci_writel (ohci, RH_HS_OCIC,
 693                                         &ohci->regs->roothub.status);
 694                 case C_HUB_LOCAL_POWER:
 695                         break;
 696                 default:
 697                         goto error;
 698                 }
 699                 break;
 700         case ClearPortFeature:
 701                 if (!wIndex || wIndex > ports)
 702                         goto error;
 703                 wIndex--;
 704
 705                 switch (wValue) {
 706                 case USB_PORT_FEAT_ENABLE:
 707                         temp = RH_PS_CCS;
 708                         break;
 709                 case USB_PORT_FEAT_C_ENABLE:
 710                         temp = RH_PS_PESC;
 711                         break;
 712                 case USB_PORT_FEAT_SUSPEND:
 713                         temp = RH_PS_POCI;
 714                         break;
 715                 case USB_PORT_FEAT_C_SUSPEND:
 716                         temp = RH_PS_PSSC;
 717                         break;
 718                 case USB_PORT_FEAT_POWER:
 719                         temp = RH_PS_LSDA;
 720                         break;
 721                 case USB_PORT_FEAT_C_CONNECTION:
 722                         temp = RH_PS_CSC;
 723                         break;
 724                 case USB_PORT_FEAT_C_OVER_CURRENT:
 725                         temp = RH_PS_OCIC;
 726                         break;
 727                 case USB_PORT_FEAT_C_RESET:
 728                         temp = RH_PS_PRSC;
 729                         break;
 730                 default:
 731                         goto error;
 732                 }
 733                 ohci_writel (ohci, temp,
 734                                 &ohci->regs->roothub.portstatus [wIndex]);
 735                 // ohci_readl (ohci, &ohci->regs->roothub.portstatus [wIndex]);
 736                 break;
 737         case GetHubDescriptor:
 738                 ohci_hub_descriptor (ohci, (struct usb_hub_descriptor *) buf);
 739                 break;
 740         case GetHubStatus:
 741                 temp = roothub_status (ohci) & ~(RH_HS_CRWE | RH_HS_DRWE);
 742                 put_unaligned_le32(temp, buf);
 743                 break;
 744         case GetPortStatus:
 745                 if (!wIndex || wIndex > ports)
 746                         goto error;
 747                 wIndex--;
 748                 temp = roothub_portstatus (ohci, wIndex);
 749                 put_unaligned_le32(temp, buf);
 750
 751                 if (*(u16*)(buf+2))     /* only if wPortChange is interesting */
 752                         dbg_port(ohci, "GetStatus", wIndex, temp);
 753                 break;
 754         case SetHubFeature:
 755                 switch (wValue) {
 756                 case C_HUB_OVER_CURRENT:
 757                         // FIXME:  this can be cleared, yes?
 758                 case C_HUB_LOCAL_POWER:
 759                         break;
 760                 default:
 761                         goto error;
 762                 }
 763                 break;
 764         case SetPortFeature:
 765                 if (!wIndex || wIndex > ports)
 766                         goto error;
 767                 wIndex--;
 768                 switch (wValue) {
 769                 case USB_PORT_FEAT_SUSPEND:
 770 #ifdef  CONFIG_USB_OTG
 771                         if (hcd->self.otg_port == (wIndex + 1)
 772                                         && hcd->self.b_hnp_enable)
 773                                 ohci->start_hnp(ohci);
 774                         else
 775 #endif
 776                         ohci_writel (ohci, RH_PS_PSS,
 777                                 &ohci->regs->roothub.portstatus [wIndex]);
 778                         break;
 779                 case USB_PORT_FEAT_POWER:
 780                         ohci_writel (ohci, RH_PS_PPS,
 781                                 &ohci->regs->roothub.portstatus [wIndex]);
 782                         break;
 783                 case USB_PORT_FEAT_RESET:
 784                         retval = root_port_reset (ohci, wIndex);
 785                         break;
 786                 default:
 787                         goto error;
 788                 }
 789                 break;
 790
 791         default:
 792 error:
 793                 /* "protocol stall" on error */
 794                 retval = -EPIPE;
 795         }
 796         return retval;
 797 }
 798 EXPORT_SYMBOL_GPL(ohci_hub_control);