ohci-hub.c

   1 // SPDX-License-Identifier: GPL-1.0+
   2 /*
   3  * OHCI HCD (Host Controller Driver) for USB.
   4  *
   5  * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
   6  * (C) Copyright 2000-2004 David Brownell <dbrownell@users.sourceforge.net>
   7  *
   8  * This file is licenced under GPL
   9  */
  10
  11 /*-------------------------------------------------------------------------*/
  12
  13 /*
  14  * OHCI Root Hub ... the nonsharable stuff
  15  */
  16
  17 #define dbg_port(hc,label,num,value) \
  18         ohci_dbg (hc, \
  19                 "%s roothub.portstatus [%d] " \
  20                 "= 0x%08x%s%s%s%s%s%s%s%s%s%s%s%s\n", \
  21                 label, num, value, \
  22                 (value & RH_PS_PRSC) ? " PRSC" : "", \
  23                 (value & RH_PS_OCIC) ? " OCIC" : "", \
  24                 (value & RH_PS_PSSC) ? " PSSC" : "", \
  25                 (value & RH_PS_PESC) ? " PESC" : "", \
  26                 (value & RH_PS_CSC) ? " CSC" : "", \
  27                 \
  28                 (value & RH_PS_LSDA) ? " LSDA" : "", \
  29                 (value & RH_PS_PPS) ? " PPS" : "", \
  30                 (value & RH_PS_PRS) ? " PRS" : "", \
  31                 (value & RH_PS_POCI) ? " POCI" : "", \
  32                 (value & RH_PS_PSS) ? " PSS" : "", \
  33                 \
  34                 (value & RH_PS_PES) ? " PES" : "", \
  35                 (value & RH_PS_CCS) ? " CCS" : "" \
  36                 );
  37
  38 /*-------------------------------------------------------------------------*/
  39
  40 #define OHCI_SCHED_ENABLES \
  41         (OHCI_CTRL_CLE|OHCI_CTRL_BLE|OHCI_CTRL_PLE|OHCI_CTRL_IE)
  42
  43 static void update_done_list(struct ohci_hcd *);
  44 static void ohci_work(struct ohci_hcd *);
  45
  46 #ifdef  CONFIG_PM
  47 static int ohci_rh_suspend (struct ohci_hcd *ohci, int autostop)
  48 __releases(ohci->lock)
  49 __acquires(ohci->lock)
  50 {
  51         int                     status = 0;
  52
  53         ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
  54         switch (ohci->hc_control & OHCI_CTRL_HCFS) {
  55         case OHCI_USB_RESUME:
  56                 ohci_dbg (ohci, "resume/suspend?\n");
  57                 ohci->hc_control &= ~OHCI_CTRL_HCFS;
  58                 ohci->hc_control |= OHCI_USB_RESET;
  59                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
  60                 (void) ohci_readl (ohci, &ohci->regs->control);
  61                 fallthrough;
  62         case OHCI_USB_RESET:
  63                 status = -EBUSY;
  64                 ohci_dbg (ohci, "needs reinit!\n");
  65                 goto done;
  66         case OHCI_USB_SUSPEND:
  67                 if (!ohci->autostop) {
  68                         ohci_dbg (ohci, "already suspended\n");
  69                         goto done;
  70                 }
  71         }
  72         ohci_dbg (ohci, "%s root hub\n",
  73                         autostop ? "auto-stop" : "suspend");
  74
  75         /* First stop any processing */
  76         if (!autostop && (ohci->hc_control & OHCI_SCHED_ENABLES)) {
  77                 ohci->hc_control &= ~OHCI_SCHED_ENABLES;
  78                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
  79                 ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
  80                 ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrstatus);
  81
  82                 /* sched disables take effect on the next frame,
  83                  * then the last WDH could take 6+ msec
  84                  */
  85                 ohci_dbg (ohci, "stopping schedules ...\n");
  86                 ohci->autostop = 0;
  87                 spin_unlock_irq (&ohci->lock);
  88                 msleep (8);
  89                 spin_lock_irq (&ohci->lock);
  90         }
  91         update_done_list(ohci);
  92         ohci_work(ohci);
  93
  94         /* All ED unlinks should be finished, no need for SOF interrupts */
  95         ohci_writel(ohci, OHCI_INTR_SF, &ohci->regs->intrdisable);
  96
  97         /*
  98          * Some controllers don't handle "global" suspend properly if
  99          * there are unsuspended ports.  For these controllers, put all
 100          * the enabled ports into suspend before suspending the root hub.
 101          */
 102         if (ohci->flags & OHCI_QUIRK_GLOBAL_SUSPEND) {
 103                 __hc32 __iomem  *portstat = ohci->regs->roothub.portstatus;
 104                 int             i;
 105                 unsigned        temp;
 106
 107                 for (i = 0; i < ohci->num_ports; (++i, ++portstat)) {
 108                         temp = ohci_readl(ohci, portstat);
 109                         if ((temp & (RH_PS_PES | RH_PS_PSS)) ==
 110                                         RH_PS_PES)
 111                                 ohci_writel(ohci, RH_PS_PSS, portstat);
 112                 }
 113         }
 114
 115         /* maybe resume can wake root hub */
 116         if (ohci_to_hcd(ohci)->self.root_hub->do_remote_wakeup || autostop) {
 117                 ohci->hc_control |= OHCI_CTRL_RWE;
 118         } else {
 119                 ohci_writel(ohci, OHCI_INTR_RHSC | OHCI_INTR_RD,
 120                                 &ohci->regs->intrdisable);
 121                 ohci->hc_control &= ~OHCI_CTRL_RWE;
 122         }
 123
 124         /* Suspend hub ... this is the "global (to this bus) suspend" mode,
 125          * which doesn't imply ports will first be individually suspended.
 126          */
 127         ohci->hc_control &= ~OHCI_CTRL_HCFS;
 128         ohci->hc_control |= OHCI_USB_SUSPEND;
 129         ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 130         (void) ohci_readl (ohci, &ohci->regs->control);
 131
 132         /* no resumes until devices finish suspending */
 133         if (!autostop) {
 134                 ohci->next_statechange = jiffies + msecs_to_jiffies (5);
 135                 ohci->autostop = 0;
 136                 ohci->rh_state = OHCI_RH_SUSPENDED;
 137         }
 138
 139 done:
 140         return status;
 141 }
 142
 143 static inline struct ed *find_head (struct ed *ed)
 144 {
 145         /* for bulk and control lists */
 146         while (ed->ed_prev)
 147                 ed = ed->ed_prev;
 148         return ed;
 149 }
 150
 151 /* caller has locked the root hub */
 152 static int ohci_rh_resume (struct ohci_hcd *ohci)
 153 __releases(ohci->lock)
 154 __acquires(ohci->lock)
 155 {
 156         struct usb_hcd          *hcd = ohci_to_hcd (ohci);
 157         u32                     temp, enables;
 158         int                     status = -EINPROGRESS;
 159         int                     autostopped = ohci->autostop;
 160
 161         ohci->autostop = 0;
 162         ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
 163
 164         if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) {
 165                 /* this can happen after resuming a swsusp snapshot */
 166                 if (ohci->rh_state != OHCI_RH_RUNNING) {
 167                         ohci_dbg (ohci, "BIOS/SMM active, control %03x\n",
 168                                         ohci->hc_control);
 169                         status = -EBUSY;
 170                 /* this happens when pmcore resumes HC then root */
 171                 } else {
 172                         ohci_dbg (ohci, "duplicate resume\n");
 173                         status = 0;
 174                 }
 175         } else switch (ohci->hc_control & OHCI_CTRL_HCFS) {
 176         case OHCI_USB_SUSPEND:
 177                 ohci->hc_control &= ~(OHCI_CTRL_HCFS|OHCI_SCHED_ENABLES);
 178                 ohci->hc_control |= OHCI_USB_RESUME;
 179                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 180                 (void) ohci_readl (ohci, &ohci->regs->control);
 181                 ohci_dbg (ohci, "%s root hub\n",
 182                                 autostopped ? "auto-start" : "resume");
 183                 break;
 184         case OHCI_USB_RESUME:
 185                 /* HCFS changes sometime after INTR_RD */
 186                 ohci_dbg(ohci, "%swakeup root hub\n",
 187                                 autostopped ? "auto-" : "");
 188                 break;
 189         case OHCI_USB_OPER:
 190                 /* this can happen after resuming a swsusp snapshot */
 191                 ohci_dbg (ohci, "snapshot resume? reinit\n");
 192                 status = -EBUSY;
 193                 break;
 194         default:                /* RESET, we lost power */
 195                 ohci_dbg (ohci, "lost power\n");
 196                 status = -EBUSY;
 197         }
 198         if (status == -EBUSY) {
 199                 if (!autostopped) {
 200                         spin_unlock_irq (&ohci->lock);
 201                         status = ohci_restart (ohci);
 202
 203                         usb_root_hub_lost_power(hcd->self.root_hub);
 204
 205                         spin_lock_irq (&ohci->lock);
 206                 }
 207                 return status;
 208         }
 209         if (status != -EINPROGRESS)
 210                 return status;
 211         if (autostopped)
 212                 goto skip_resume;
 213         spin_unlock_irq (&ohci->lock);
 214
 215         /* Some controllers (lucent erratum) need extra-long delays */
 216         msleep (20 /* usb 11.5.1.10 */ + 12 /* 32 msec counter */ + 1);
 217
 218         temp = ohci_readl (ohci, &ohci->regs->control);
 219         temp &= OHCI_CTRL_HCFS;
 220         if (temp != OHCI_USB_RESUME) {
 221                 ohci_err (ohci, "controller won't resume\n");
 222                 spin_lock_irq(&ohci->lock);
 223                 return -EBUSY;
 224         }
 225
 226         /* disable old schedule state, reinit from scratch */
 227         ohci_writel (ohci, 0, &ohci->regs->ed_controlhead);
 228         ohci_writel (ohci, 0, &ohci->regs->ed_controlcurrent);
 229         ohci_writel (ohci, 0, &ohci->regs->ed_bulkhead);
 230         ohci_writel (ohci, 0, &ohci->regs->ed_bulkcurrent);
 231         ohci_writel (ohci, 0, &ohci->regs->ed_periodcurrent);
 232         ohci_writel (ohci, (u32) ohci->hcca_dma, &ohci->regs->hcca);
 233
 234         /* Sometimes PCI D3 suspend trashes frame timings ... */
 235         periodic_reinit (ohci);
 236
 237         /*
 238          * The following code is executed with ohci->lock held and
 239          * irqs disabled if and only if autostopped is true.  This
 240          * will cause sparse to warn about a "context imbalance".
 241          */
 242 skip_resume:
 243         /* interrupts might have been disabled */
 244         ohci_writel (ohci, OHCI_INTR_INIT, &ohci->regs->intrenable);
 245         if (ohci->ed_rm_list)
 246                 ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrenable);
 247
 248         /* Then re-enable operations */
 249         ohci_writel (ohci, OHCI_USB_OPER, &ohci->regs->control);
 250         (void) ohci_readl (ohci, &ohci->regs->control);
 251         if (!autostopped)
 252                 msleep (3);
 253
 254         temp = ohci->hc_control;
 255         temp &= OHCI_CTRL_RWC;
 256         temp |= OHCI_CONTROL_INIT | OHCI_USB_OPER;
 257         ohci->hc_control = temp;
 258         ohci_writel (ohci, temp, &ohci->regs->control);
 259         (void) ohci_readl (ohci, &ohci->regs->control);
 260
 261         /* TRSMRCY */
 262         if (!autostopped) {
 263                 msleep (10);
 264                 spin_lock_irq (&ohci->lock);
 265         }
 266         /* now ohci->lock is always held and irqs are always disabled */
 267
 268         /* keep it alive for more than ~5x suspend + resume costs */
 269         ohci->next_statechange = jiffies + STATECHANGE_DELAY;
 270
 271         /* maybe turn schedules back on */
 272         enables = 0;
 273         temp = 0;
 274         if (!ohci->ed_rm_list) {
 275                 if (ohci->ed_controltail) {
 276                         ohci_writel (ohci,
 277                                         find_head (ohci->ed_controltail)->dma,
 278                                         &ohci->regs->ed_controlhead);
 279                         enables |= OHCI_CTRL_CLE;
 280                         temp |= OHCI_CLF;
 281                 }
 282                 if (ohci->ed_bulktail) {
 283                         ohci_writel (ohci, find_head (ohci->ed_bulktail)->dma,
 284                                 &ohci->regs->ed_bulkhead);
 285                         enables |= OHCI_CTRL_BLE;
 286                         temp |= OHCI_BLF;
 287                 }
 288         }
 289         if (hcd->self.bandwidth_isoc_reqs || hcd->self.bandwidth_int_reqs)
 290                 enables |= OHCI_CTRL_PLE|OHCI_CTRL_IE;
 291         if (enables) {
 292                 ohci_dbg (ohci, "restarting schedules ... %08x\n", enables);
 293                 ohci->hc_control |= enables;
 294                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 295                 if (temp)
 296                         ohci_writel (ohci, temp, &ohci->regs->cmdstatus);
 297                 (void) ohci_readl (ohci, &ohci->regs->control);
 298         }
 299
 300         ohci->rh_state = OHCI_RH_RUNNING;
 301         return 0;
 302 }
 303
 304 static int ohci_bus_suspend (struct usb_hcd *hcd)
 305 {
 306         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
 307         int                     rc;
 308
 309         spin_lock_irq (&ohci->lock);
 310
 311         if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
 312                 rc = -ESHUTDOWN;
 313         else
 314                 rc = ohci_rh_suspend (ohci, 0);
 315         spin_unlock_irq (&ohci->lock);
 316
 317         if (rc == 0) {
 318                 del_timer_sync(&ohci->io_watchdog);
 319                 ohci->prev_frame_no = IO_WATCHDOG_OFF;
 320         }
 321         return rc;
 322 }
 323
 324 static int ohci_bus_resume (struct usb_hcd *hcd)
 325 {
 326         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
 327         int                     rc;
 328
 329         if (time_before (jiffies, ohci->next_statechange))
 330                 msleep(5);
 331
 332         spin_lock_irq (&ohci->lock);
 333
 334         if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
 335                 rc = -ESHUTDOWN;
 336         else
 337                 rc = ohci_rh_resume (ohci);
 338         spin_unlock_irq (&ohci->lock);
 339
 340         /* poll until we know a device is connected or we autostop */
 341         if (rc == 0)
 342                 usb_hcd_poll_rh_status(hcd);
 343         return rc;
 344 }
 345
 346 /* Carry out polling-, autostop-, and autoresume-related state changes */
 347 static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
 348                 int any_connected, int rhsc_status)
 349 {
 350         int     poll_rh = 1;
 351         int     rhsc_enable;
 352
 353         /* Some broken controllers never turn off RHSC in the interrupt
 354          * status register.  For their sake we won't re-enable RHSC
 355          * interrupts if the interrupt bit is already active.
 356          */
 357         rhsc_enable = ohci_readl(ohci, &ohci->regs->intrenable) &
 358                         OHCI_INTR_RHSC;
 359
 360         switch (ohci->hc_control & OHCI_CTRL_HCFS) {
 361         case OHCI_USB_OPER:
 362                 /* If no status changes are pending, enable RHSC interrupts. */
 363                 if (!rhsc_enable && !rhsc_status && !changed) {
 364                         rhsc_enable = OHCI_INTR_RHSC;
 365                         ohci_writel(ohci, rhsc_enable, &ohci->regs->intrenable);
 366                 }
 367
 368                 /* Keep on polling until we know a device is connected
 369                  * and RHSC is enabled, or until we autostop.
 370                  */
 371                 if (!ohci->autostop) {
 372                         if (any_connected ||
 373                                         !device_may_wakeup(&ohci_to_hcd(ohci)
 374                                                 ->self.root_hub->dev)) {
 375                                 if (rhsc_enable)
 376                                         poll_rh = 0;
 377                         } else {
 378                                 ohci->autostop = 1;
 379                                 ohci->next_statechange = jiffies + HZ;
 380                         }
 381
 382                 /* if no devices have been attached for one second, autostop */
 383                 } else {
 384                         if (changed || any_connected) {
 385                                 ohci->autostop = 0;
 386                                 ohci->next_statechange = jiffies +
 387                                                 STATECHANGE_DELAY;
 388                         } else if (time_after_eq(jiffies,
 389                                                 ohci->next_statechange)
 390                                         && !ohci->ed_rm_list
 391                                         && !(ohci->hc_control &
 392                                                 OHCI_SCHED_ENABLES)) {
 393                                 ohci_rh_suspend(ohci, 1);
 394                                 if (rhsc_enable)
 395                                         poll_rh = 0;
 396                         }
 397                 }
 398                 break;
 399
 400         case OHCI_USB_SUSPEND:
 401         case OHCI_USB_RESUME:
 402                 /* if there is a port change, autostart or ask to be resumed */
 403                 if (changed) {
 404                         if (ohci->autostop)
 405                                 ohci_rh_resume(ohci);
 406                         else
 407                                 usb_hcd_resume_root_hub(ohci_to_hcd(ohci));
 408
 409                 /* If remote wakeup is disabled, stop polling */
 410                 } else if (!ohci->autostop &&
 411                                 !ohci_to_hcd(ohci)->self.root_hub->
 412                                         do_remote_wakeup) {
 413                         poll_rh = 0;
 414
 415                 } else {
 416                         /* If no status changes are pending,
 417                          * enable RHSC interrupts
 418                          */
 419                         if (!rhsc_enable && !rhsc_status) {
 420                                 rhsc_enable = OHCI_INTR_RHSC;
 421                                 ohci_writel(ohci, rhsc_enable,
 422                                                 &ohci->regs->intrenable);
 423                         }
 424                         /* Keep polling until RHSC is enabled */
 425                         if (rhsc_enable)
 426                                 poll_rh = 0;
 427                 }
 428                 break;
 429         }
 430         return poll_rh;
 431 }
 432
 433 #else   /* CONFIG_PM */
 434
 435 static inline int ohci_rh_resume(struct ohci_hcd *ohci)
 436 {
 437         return 0;
 438 }
 439
 440 /* Carry out polling-related state changes.
 441  * autostop isn't used when CONFIG_PM is turned off.
 442  */
 443 static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
 444                 int any_connected, int rhsc_status)
 445 {
 446         /* If RHSC is enabled, don't poll */
 447         if (ohci_readl(ohci, &ohci->regs->intrenable) & OHCI_INTR_RHSC)
 448                 return 0;
 449
 450         /* If status changes are pending, continue polling.
 451          * Conversely, if no status changes are pending but the RHSC
 452          * status bit was set, then RHSC may be broken so continue polling.
 453          */
 454         if (changed || rhsc_status)
 455                 return 1;
 456
 457         /* It's safe to re-enable RHSC interrupts */
 458         ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrenable);
 459         return 0;
 460 }
 461
 462 #endif  /* CONFIG_PM */
 463
 464 /*-------------------------------------------------------------------------*/
 465
 466 /* build "status change" packet (one or two bytes) from HC registers */
 467
 468 int ohci_hub_status_data(struct usb_hcd *hcd, char *buf)
 469 {
 470         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 471         int             i, changed = 0, length = 1;
 472         int             any_connected = 0;
 473         int             rhsc_status;
 474         unsigned long   flags;
 475
 476         spin_lock_irqsave (&ohci->lock, flags);
 477         if (!HCD_HW_ACCESSIBLE(hcd))
 478                 goto done;
 479
 480         /* undocumented erratum seen on at least rev D */
 481         if ((ohci->flags & OHCI_QUIRK_AMD756)
 482                         && (roothub_a (ohci) & RH_A_NDP) > MAX_ROOT_PORTS) {
 483                 ohci_warn (ohci, "bogus NDP, rereads as NDP=%d\n",
 484                           ohci_readl (ohci, &ohci->regs->roothub.a) & RH_A_NDP);
 485                 /* retry later; "should not happen" */
 486                 goto done;
 487         }
 488
 489         /* init status */
 490         if (roothub_status (ohci) & (RH_HS_LPSC | RH_HS_OCIC))
 491                 buf [0] = changed = 1;
 492         else
 493                 buf [0] = 0;
 494         if (ohci->num_ports > 7) {
 495                 buf [1] = 0;
 496                 length++;
 497         }
 498
 499         /* Clear the RHSC status flag before reading the port statuses */
 500         ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrstatus);
 501         rhsc_status = ohci_readl(ohci, &ohci->regs->intrstatus) &
 502                         OHCI_INTR_RHSC;
 503
 504         /* look at each port */
 505         for (i = 0; i < ohci->num_ports; i++) {
 506                 u32     status = roothub_portstatus (ohci, i);
 507
 508                 /* can't autostop if ports are connected */
 509                 any_connected |= (status & RH_PS_CCS);
 510
 511                 if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC
 512                                 | RH_PS_OCIC | RH_PS_PRSC)) {
 513                         changed = 1;
 514                         if (i < 7)
 515                             buf [0] |= 1 << (i + 1);
 516                         else
 517                             buf [1] |= 1 << (i - 7);
 518                 }
 519         }
 520
 521         if (ohci_root_hub_state_changes(ohci, changed,
 522                         any_connected, rhsc_status))
 523                 set_bit(HCD_FLAG_POLL_RH, &hcd->flags);
 524         else
 525                 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
 526
 527
 528 done:
 529         spin_unlock_irqrestore (&ohci->lock, flags);
 530
 531         return changed ? length : 0;
 532 }
 533 EXPORT_SYMBOL_GPL(ohci_hub_status_data);
 534
 535 /*-------------------------------------------------------------------------*/
 536
 537 static void
 538 ohci_hub_descriptor (
 539         struct ohci_hcd                 *ohci,
 540         struct usb_hub_descriptor       *desc
 541 ) {
 542         u32             rh = roothub_a (ohci);
 543         u16             temp;
 544
 545         desc->bDescriptorType = USB_DT_HUB;
 546         desc->bPwrOn2PwrGood = (rh & RH_A_POTPGT) >> 24;
 547         desc->bHubContrCurrent = 0;
 548
 549         desc->bNbrPorts = ohci->num_ports;
 550         temp = 1 + (ohci->num_ports / 8);
 551         desc->bDescLength = 7 + 2 * temp;
 552
 553         temp = HUB_CHAR_COMMON_LPSM | HUB_CHAR_COMMON_OCPM;
 554         if (rh & RH_A_NPS)              /* no power switching? */
 555                 temp |= HUB_CHAR_NO_LPSM;
 556         if (rh & RH_A_PSM)              /* per-port power switching? */
 557                 temp |= HUB_CHAR_INDV_PORT_LPSM;
 558         if (rh & RH_A_NOCP)             /* no overcurrent reporting? */
 559                 temp |= HUB_CHAR_NO_OCPM;
 560         else if (rh & RH_A_OCPM)        /* per-port overcurrent reporting? */
 561                 temp |= HUB_CHAR_INDV_PORT_OCPM;
 562         desc->wHubCharacteristics = cpu_to_le16(temp);
 563
 564         /* ports removable, and usb 1.0 legacy PortPwrCtrlMask */
 565         rh = roothub_b (ohci);
 566         memset(desc->u.hs.DeviceRemovable, 0xff,
 567                         sizeof(desc->u.hs.DeviceRemovable));
 568         desc->u.hs.DeviceRemovable[0] = rh & RH_B_DR;
 569         if (ohci->num_ports > 7) {
 570                 desc->u.hs.DeviceRemovable[1] = (rh & RH_B_DR) >> 8;
 571                 desc->u.hs.DeviceRemovable[2] = 0xff;
 572         } else
 573                 desc->u.hs.DeviceRemovable[1] = 0xff;
 574 }
 575
 576 /*-------------------------------------------------------------------------*/
 577
 578 #ifdef  CONFIG_USB_OTG
 579
 580 static int ohci_start_port_reset (struct usb_hcd *hcd, unsigned port)
 581 {
 582         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 583         u32                     status;
 584
 585         if (!port)
 586                 return -EINVAL;
 587         port--;
 588
 589         /* start port reset before HNP protocol times out */
 590         status = ohci_readl(ohci, &ohci->regs->roothub.portstatus [port]);
 591         if (!(status & RH_PS_CCS))
 592                 return -ENODEV;
 593
 594         /* hub_wq will finish the reset later */
 595         ohci_writel(ohci, RH_PS_PRS, &ohci->regs->roothub.portstatus [port]);
 596         return 0;
 597 }
 598
 599 #else
 600
 601 #define ohci_start_port_reset           NULL
 602
 603 #endif
 604
 605 /*-------------------------------------------------------------------------*/
 606
 607
 608 /* See usb 7.1.7.5:  root hubs must issue at least 50 msec reset signaling,
 609  * not necessarily continuous ... to guard against resume signaling.
 610  */
 611 #define PORT_RESET_MSEC         50
 612
 613 /* this timer value might be vendor-specific ... */
 614 #define PORT_RESET_HW_MSEC      10
 615
 616 /* wrap-aware logic morphed from <linux/jiffies.h> */
 617 #define tick_before(t1,t2) ((s16)(((s16)(t1))-((s16)(t2))) < 0)
 618
 619 /* called from some task, normally hub_wq */
 620 static inline int root_port_reset (struct ohci_hcd *ohci, unsigned port)
 621 {
 622         __hc32 __iomem *portstat = &ohci->regs->roothub.portstatus [port];
 623         u32     temp = 0;
 624         u16     now = ohci_readl(ohci, &ohci->regs->fmnumber);
 625         u16     reset_done = now + PORT_RESET_MSEC;
 626         int     limit_1 = DIV_ROUND_UP(PORT_RESET_MSEC, PORT_RESET_HW_MSEC);
 627
 628         /* build a "continuous enough" reset signal, with up to
 629          * 3msec gap between pulses.  scheduler HZ==100 must work;
 630          * this might need to be deadline-scheduled.
 631          */
 632         do {
 633                 int limit_2;
 634
 635                 /* spin until any current reset finishes */
 636                 limit_2 = PORT_RESET_HW_MSEC * 2;
 637                 while (--limit_2 >= 0) {
 638                         temp = ohci_readl (ohci, portstat);
 639                         /* handle e.g. CardBus eject */
 640                         if (temp == ~(u32)0)
 641                                 return -ESHUTDOWN;
 642                         if (!(temp & RH_PS_PRS))
 643                                 break;
 644                         udelay (500);
 645                 }
 646
 647                 /* timeout (a hardware error) has been observed when
 648                  * EHCI sets CF while this driver is resetting a port;
 649                  * presumably other disconnect paths might do it too.
 650                  */
 651                 if (limit_2 < 0) {
 652                         ohci_dbg(ohci,
 653                                 "port[%d] reset timeout, stat %08x\n",
 654                                 port, temp);
 655                         break;
 656                 }
 657
 658                 if (!(temp & RH_PS_CCS))
 659                         break;
 660                 if (temp & RH_PS_PRSC)
 661                         ohci_writel (ohci, RH_PS_PRSC, portstat);
 662
 663                 /* start the next reset, sleep till it's probably done */
 664                 ohci_writel (ohci, RH_PS_PRS, portstat);
 665                 msleep(PORT_RESET_HW_MSEC);
 666                 now = ohci_readl(ohci, &ohci->regs->fmnumber);
 667         } while (tick_before(now, reset_done) && --limit_1 >= 0);
 668
 669         /* caller synchronizes using PRSC ... and handles PRS
 670          * still being set when this returns.
 671          */
 672
 673         return 0;
 674 }
 675
 676 int ohci_hub_control(
 677         struct usb_hcd  *hcd,
 678         u16             typeReq,
 679         u16             wValue,
 680         u16             wIndex,
 681         char            *buf,
 682         u16             wLength
 683 ) {
 684         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 685         int             ports = ohci->num_ports;
 686         u32             temp;
 687         int             retval = 0;
 688
 689         if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
 690                 return -ESHUTDOWN;
 691
 692         switch (typeReq) {
 693         case ClearHubFeature:
 694                 switch (wValue) {
 695                 case C_HUB_OVER_CURRENT:
 696                         ohci_writel (ohci, RH_HS_OCIC,
 697                                         &ohci->regs->roothub.status);
 698                         break;
 699                 case C_HUB_LOCAL_POWER:
 700                         break;
 701                 default:
 702                         goto error;
 703                 }
 704                 break;
 705         case ClearPortFeature:
 706                 if (!wIndex || wIndex > ports)
 707                         goto error;
 708                 wIndex--;
 709
 710                 switch (wValue) {
 711                 case USB_PORT_FEAT_ENABLE:
 712                         temp = RH_PS_CCS;
 713                         break;
 714                 case USB_PORT_FEAT_C_ENABLE:
 715                         temp = RH_PS_PESC;
 716                         break;
 717                 case USB_PORT_FEAT_SUSPEND:
 718                         temp = RH_PS_POCI;
 719                         break;
 720                 case USB_PORT_FEAT_C_SUSPEND:
 721                         temp = RH_PS_PSSC;
 722                         break;
 723                 case USB_PORT_FEAT_POWER:
 724                         temp = RH_PS_LSDA;
 725                         break;
 726                 case USB_PORT_FEAT_C_CONNECTION:
 727                         temp = RH_PS_CSC;
 728                         break;
 729                 case USB_PORT_FEAT_C_OVER_CURRENT:
 730                         temp = RH_PS_OCIC;
 731                         break;
 732                 case USB_PORT_FEAT_C_RESET:
 733                         temp = RH_PS_PRSC;
 734                         break;
 735                 default:
 736                         goto error;
 737                 }
 738                 ohci_writel (ohci, temp,
 739                                 &ohci->regs->roothub.portstatus [wIndex]);
 740                 // ohci_readl (ohci, &ohci->regs->roothub.portstatus [wIndex]);
 741                 break;
 742         case GetHubDescriptor:
 743                 ohci_hub_descriptor (ohci, (struct usb_hub_descriptor *) buf);
 744                 break;
 745         case GetHubStatus:
 746                 temp = roothub_status (ohci) & ~(RH_HS_CRWE | RH_HS_DRWE);
 747                 put_unaligned_le32(temp, buf);
 748                 break;
 749         case GetPortStatus:
 750                 if (!wIndex || wIndex > ports)
 751                         goto error;
 752                 wIndex--;
 753                 temp = roothub_portstatus (ohci, wIndex);
 754                 put_unaligned_le32(temp, buf);
 755
 756                 if (*(u16*)(buf+2))     /* only if wPortChange is interesting */
 757                         dbg_port(ohci, "GetStatus", wIndex, temp);
 758                 break;
 759         case SetHubFeature:
 760                 switch (wValue) {
 761                 case C_HUB_OVER_CURRENT:
 762                         // FIXME:  this can be cleared, yes?
 763                 case C_HUB_LOCAL_POWER:
 764                         break;
 765                 default:
 766                         goto error;
 767                 }
 768                 break;
 769         case SetPortFeature:
 770                 if (!wIndex || wIndex > ports)
 771                         goto error;
 772                 wIndex--;
 773                 switch (wValue) {
 774                 case USB_PORT_FEAT_SUSPEND:
 775 #ifdef  CONFIG_USB_OTG
 776                         if (hcd->self.otg_port == (wIndex + 1)
 777                                         && hcd->self.b_hnp_enable)
 778                                 ohci->start_hnp(ohci);
 779                         else
 780 #endif
 781                         ohci_writel (ohci, RH_PS_PSS,
 782                                 &ohci->regs->roothub.portstatus [wIndex]);
 783                         break;
 784                 case USB_PORT_FEAT_POWER:
 785                         ohci_writel (ohci, RH_PS_PPS,
 786                                 &ohci->regs->roothub.portstatus [wIndex]);
 787                         break;
 788                 case USB_PORT_FEAT_RESET:
 789                         retval = root_port_reset (ohci, wIndex);
 790                         break;
 791                 default:
 792                         goto error;
 793                 }
 794                 break;
 795
 796         default:
 797 error:
 798                 /* "protocol stall" on error */
 799                 retval = -EPIPE;
 800         }
 801         return retval;
 802 }
 803 EXPORT_SYMBOL_GPL(ohci_hub_control);