err.no Git - linux-2.6/blob - 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 /* hcd->hub_irq_enable() */
  40 static void ohci_rhsc_enable (struct usb_hcd *hcd)
  41 {
  42         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
  43
  44         spin_lock_irq(&ohci->lock);
  45         if (!ohci->autostop)
  46                 del_timer(&hcd->rh_timer);      /* Prevent next poll */
  47         ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrenable);
  48         spin_unlock_irq(&ohci->lock);
  49 }
  50
  51 #define OHCI_SCHED_ENABLES \
  52         (OHCI_CTRL_CLE|OHCI_CTRL_BLE|OHCI_CTRL_PLE|OHCI_CTRL_IE)
  53
  54 static void dl_done_list (struct ohci_hcd *);
  55 static void finish_unlinks (struct ohci_hcd *, u16);
  56
  57 #ifdef  CONFIG_PM
  58 static int ohci_restart(struct ohci_hcd *ohci);
  59
  60 static int ohci_rh_suspend (struct ohci_hcd *ohci, int autostop)
  61 __releases(ohci->lock)
  62 __acquires(ohci->lock)
  63 {
  64         int                     status = 0;
  65
  66         ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
  67         switch (ohci->hc_control & OHCI_CTRL_HCFS) {
  68         case OHCI_USB_RESUME:
  69                 ohci_dbg (ohci, "resume/suspend?\n");
  70                 ohci->hc_control &= ~OHCI_CTRL_HCFS;
  71                 ohci->hc_control |= OHCI_USB_RESET;
  72                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
  73                 (void) ohci_readl (ohci, &ohci->regs->control);
  74                 /* FALL THROUGH */
  75         case OHCI_USB_RESET:
  76                 status = -EBUSY;
  77                 ohci_dbg (ohci, "needs reinit!\n");
  78                 goto done;
  79         case OHCI_USB_SUSPEND:
  80                 if (!ohci->autostop) {
  81                         ohci_dbg (ohci, "already suspended\n");
  82                         goto done;
  83                 }
  84         }
  85         ohci_dbg (ohci, "%s root hub\n",
  86                         autostop ? "auto-stop" : "suspend");
  87
  88         /* First stop any processing */
  89         if (!autostop && (ohci->hc_control & OHCI_SCHED_ENABLES)) {
  90                 ohci->hc_control &= ~OHCI_SCHED_ENABLES;
  91                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
  92                 ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
  93                 ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrstatus);
  94
  95                 /* sched disables take effect on the next frame,
  96                  * then the last WDH could take 6+ msec
  97                  */
  98                 ohci_dbg (ohci, "stopping schedules ...\n");
  99                 ohci->autostop = 0;
 100                 spin_unlock_irq (&ohci->lock);
 101                 msleep (8);
 102                 spin_lock_irq (&ohci->lock);
 103         }
 104         dl_done_list (ohci);
 105         finish_unlinks (ohci, ohci_frame_no(ohci));
 106
 107         /* maybe resume can wake root hub */
 108         if (device_may_wakeup(&ohci_to_hcd(ohci)->self.root_hub->dev) ||
 109                         autostop)
 110                 ohci->hc_control |= OHCI_CTRL_RWE;
 111         else {
 112                 ohci_writel (ohci, OHCI_INTR_RHSC, &ohci->regs->intrdisable);
 113                 ohci->hc_control &= ~OHCI_CTRL_RWE;
 114         }
 115
 116         /* Suspend hub ... this is the "global (to this bus) suspend" mode,
 117          * which doesn't imply ports will first be individually suspended.
 118          */
 119         ohci->hc_control &= ~OHCI_CTRL_HCFS;
 120         ohci->hc_control |= OHCI_USB_SUSPEND;
 121         ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 122         (void) ohci_readl (ohci, &ohci->regs->control);
 123
 124         /* no resumes until devices finish suspending */
 125         if (!autostop) {
 126                 ohci->next_statechange = jiffies + msecs_to_jiffies (5);
 127                 ohci->autostop = 0;
 128         }
 129
 130 done:
 131         return status;
 132 }
 133
 134 static inline struct ed *find_head (struct ed *ed)
 135 {
 136         /* for bulk and control lists */
 137         while (ed->ed_prev)
 138                 ed = ed->ed_prev;
 139         return ed;
 140 }
 141
 142 /* caller has locked the root hub */
 143 static int ohci_rh_resume (struct ohci_hcd *ohci)
 144 __releases(ohci->lock)
 145 __acquires(ohci->lock)
 146 {
 147         struct usb_hcd          *hcd = ohci_to_hcd (ohci);
 148         u32                     temp, enables;
 149         int                     status = -EINPROGRESS;
 150         int                     autostopped = ohci->autostop;
 151
 152         ohci->autostop = 0;
 153         ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
 154
 155         if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) {
 156                 /* this can happen after resuming a swsusp snapshot */
 157                 if (hcd->state == HC_STATE_RESUMING) {
 158                         ohci_dbg (ohci, "BIOS/SMM active, control %03x\n",
 159                                         ohci->hc_control);
 160                         status = -EBUSY;
 161                 /* this happens when pmcore resumes HC then root */
 162                 } else {
 163                         ohci_dbg (ohci, "duplicate resume\n");
 164                         status = 0;
 165                 }
 166         } else switch (ohci->hc_control & OHCI_CTRL_HCFS) {
 167         case OHCI_USB_SUSPEND:
 168                 ohci->hc_control &= ~(OHCI_CTRL_HCFS|OHCI_SCHED_ENABLES);
 169                 ohci->hc_control |= OHCI_USB_RESUME;
 170                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 171                 (void) ohci_readl (ohci, &ohci->regs->control);
 172                 ohci_dbg (ohci, "%s root hub\n",
 173                                 autostopped ? "auto-start" : "resume");
 174                 break;
 175         case OHCI_USB_RESUME:
 176                 /* HCFS changes sometime after INTR_RD */
 177                 ohci_dbg(ohci, "%swakeup root hub\n",
 178                                 autostopped ? "auto-" : "");
 179                 break;
 180         case OHCI_USB_OPER:
 181                 /* this can happen after resuming a swsusp snapshot */
 182                 ohci_dbg (ohci, "snapshot resume? reinit\n");
 183                 status = -EBUSY;
 184                 break;
 185         default:                /* RESET, we lost power */
 186                 ohci_dbg (ohci, "lost power\n");
 187                 status = -EBUSY;
 188         }
 189         if (status == -EBUSY) {
 190                 if (!autostopped) {
 191                         spin_unlock_irq (&ohci->lock);
 192                         (void) ohci_init (ohci);
 193                         status = ohci_restart (ohci);
 194                         spin_lock_irq (&ohci->lock);
 195                 }
 196                 return status;
 197         }
 198         if (status != -EINPROGRESS)
 199                 return status;
 200         if (autostopped)
 201                 goto skip_resume;
 202         spin_unlock_irq (&ohci->lock);
 203
 204         /* Some controllers (lucent erratum) need extra-long delays */
 205         msleep (20 /* usb 11.5.1.10 */ + 12 /* 32 msec counter */ + 1);
 206
 207         temp = ohci_readl (ohci, &ohci->regs->control);
 208         temp &= OHCI_CTRL_HCFS;
 209         if (temp != OHCI_USB_RESUME) {
 210                 ohci_err (ohci, "controller won't resume\n");
 211                 spin_lock_irq(&ohci->lock);
 212                 return -EBUSY;
 213         }
 214
 215         /* disable old schedule state, reinit from scratch */
 216         ohci_writel (ohci, 0, &ohci->regs->ed_controlhead);
 217         ohci_writel (ohci, 0, &ohci->regs->ed_controlcurrent);
 218         ohci_writel (ohci, 0, &ohci->regs->ed_bulkhead);
 219         ohci_writel (ohci, 0, &ohci->regs->ed_bulkcurrent);
 220         ohci_writel (ohci, 0, &ohci->regs->ed_periodcurrent);
 221         ohci_writel (ohci, (u32) ohci->hcca_dma, &ohci->regs->hcca);
 222
 223         /* Sometimes PCI D3 suspend trashes frame timings ... */
 224         periodic_reinit (ohci);
 225
 226         /* the following code is executed with ohci->lock held and
 227          * irqs disabled if and only if autostopped is true
 228          */
 229
 230 skip_resume:
 231         /* interrupts might have been disabled */
 232         ohci_writel (ohci, OHCI_INTR_INIT, &ohci->regs->intrenable);
 233         if (ohci->ed_rm_list)
 234                 ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrenable);
 235
 236         /* Then re-enable operations */
 237         ohci_writel (ohci, OHCI_USB_OPER, &ohci->regs->control);
 238         (void) ohci_readl (ohci, &ohci->regs->control);
 239         if (!autostopped)
 240                 msleep (3);
 241
 242         temp = ohci->hc_control;
 243         temp &= OHCI_CTRL_RWC;
 244         temp |= OHCI_CONTROL_INIT | OHCI_USB_OPER;
 245         ohci->hc_control = temp;
 246         ohci_writel (ohci, temp, &ohci->regs->control);
 247         (void) ohci_readl (ohci, &ohci->regs->control);
 248
 249         /* TRSMRCY */
 250         if (!autostopped) {
 251                 msleep (10);
 252                 spin_lock_irq (&ohci->lock);
 253         }
 254         /* now ohci->lock is always held and irqs are always disabled */
 255
 256         /* keep it alive for more than ~5x suspend + resume costs */
 257         ohci->next_statechange = jiffies + STATECHANGE_DELAY;
 258
 259         /* maybe turn schedules back on */
 260         enables = 0;
 261         temp = 0;
 262         if (!ohci->ed_rm_list) {
 263                 if (ohci->ed_controltail) {
 264                         ohci_writel (ohci,
 265                                         find_head (ohci->ed_controltail)->dma,
 266                                         &ohci->regs->ed_controlhead);
 267                         enables |= OHCI_CTRL_CLE;
 268                         temp |= OHCI_CLF;
 269                 }
 270                 if (ohci->ed_bulktail) {
 271                         ohci_writel (ohci, find_head (ohci->ed_bulktail)->dma,
 272                                 &ohci->regs->ed_bulkhead);
 273                         enables |= OHCI_CTRL_BLE;
 274                         temp |= OHCI_BLF;
 275                 }
 276         }
 277         if (hcd->self.bandwidth_isoc_reqs || hcd->self.bandwidth_int_reqs)
 278                 enables |= OHCI_CTRL_PLE|OHCI_CTRL_IE;
 279         if (enables) {
 280                 ohci_dbg (ohci, "restarting schedules ... %08x\n", enables);
 281                 ohci->hc_control |= enables;
 282                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 283                 if (temp)
 284                         ohci_writel (ohci, temp, &ohci->regs->cmdstatus);
 285                 (void) ohci_readl (ohci, &ohci->regs->control);
 286         }
 287
 288         return 0;
 289 }
 290
 291 static int ohci_bus_suspend (struct usb_hcd *hcd)
 292 {
 293         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
 294         int                     rc;
 295
 296         spin_lock_irq (&ohci->lock);
 297
 298         if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
 299                 rc = -ESHUTDOWN;
 300         else
 301                 rc = ohci_rh_suspend (ohci, 0);
 302         spin_unlock_irq (&ohci->lock);
 303         return rc;
 304 }
 305
 306 static int ohci_bus_resume (struct usb_hcd *hcd)
 307 {
 308         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
 309         int                     rc;
 310
 311         if (time_before (jiffies, ohci->next_statechange))
 312                 msleep(5);
 313
 314         spin_lock_irq (&ohci->lock);
 315
 316         if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
 317                 rc = -ESHUTDOWN;
 318         else
 319                 rc = ohci_rh_resume (ohci);
 320         spin_unlock_irq (&ohci->lock);
 321
 322         /* poll until we know a device is connected or we autostop */
 323         if (rc == 0)
 324                 usb_hcd_poll_rh_status(hcd);
 325         return rc;
 326 }
 327
 328 /* Carry out polling-, autostop-, and autoresume-related state changes */
 329 static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
 330                 int any_connected)
 331 {
 332         int     poll_rh = 1;
 333
 334         switch (ohci->hc_control & OHCI_CTRL_HCFS) {
 335
 336         case OHCI_USB_OPER:
 337                 /* keep on polling until we know a device is connected
 338                  * and RHSC is enabled */
 339                 if (!ohci->autostop) {
 340                         if (any_connected ||
 341                                         !device_may_wakeup(&ohci_to_hcd(ohci)
 342                                                 ->self.root_hub->dev)) {
 343                                 if (ohci_readl(ohci, &ohci->regs->intrenable) &
 344                                                 OHCI_INTR_RHSC)
 345                                         poll_rh = 0;
 346                         } else {
 347                                 ohci->autostop = 1;
 348                                 ohci->next_statechange = jiffies + HZ;
 349                         }
 350
 351                 /* if no devices have been attached for one second, autostop */
 352                 } else {
 353                         if (changed || any_connected) {
 354                                 ohci->autostop = 0;
 355                                 ohci->next_statechange = jiffies +
 356                                                 STATECHANGE_DELAY;
 357                         } else if (time_after_eq(jiffies,
 358                                                 ohci->next_statechange)
 359                                         && !ohci->ed_rm_list
 360                                         && !(ohci->hc_control &
 361                                                 OHCI_SCHED_ENABLES)) {
 362                                 ohci_rh_suspend(ohci, 1);
 363                         }
 364                 }
 365                 break;
 366
 367         /* if there is a port change, autostart or ask to be resumed */
 368         case OHCI_USB_SUSPEND:
 369         case OHCI_USB_RESUME:
 370                 if (changed) {
 371                         if (ohci->autostop)
 372                                 ohci_rh_resume(ohci);
 373                         else
 374                                 usb_hcd_resume_root_hub(ohci_to_hcd(ohci));
 375                 } else {
 376                         /* everything is idle, no need for polling */
 377                         poll_rh = 0;
 378                 }
 379                 break;
 380         }
 381         return poll_rh;
 382 }
 383
 384 #else   /* CONFIG_PM */
 385
 386 static inline int ohci_rh_resume(struct ohci_hcd *ohci)
 387 {
 388         return 0;
 389 }
 390
 391 /* Carry out polling-related state changes.
 392  * autostop isn't used when CONFIG_PM is turned off.
 393  */
 394 static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
 395                 int any_connected)
 396 {
 397         int     poll_rh = 1;
 398
 399         /* keep on polling until RHSC is enabled */
 400         if (ohci_readl(ohci, &ohci->regs->intrenable) & OHCI_INTR_RHSC)
 401                 poll_rh = 0;
 402         return poll_rh;
 403 }
 404
 405 #endif  /* CONFIG_PM */
 406
 407 /*-------------------------------------------------------------------------*/
 408
 409 /* build "status change" packet (one or two bytes) from HC registers */
 410
 411 static int
 412 ohci_hub_status_data (struct usb_hcd *hcd, char *buf)
 413 {
 414         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 415         int             i, changed = 0, length = 1;
 416         int             any_connected = 0;
 417         unsigned long   flags;
 418
 419         spin_lock_irqsave (&ohci->lock, flags);
 420         if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))
 421                 goto done;
 422
 423         /* undocumented erratum seen on at least rev D */
 424         if ((ohci->flags & OHCI_QUIRK_AMD756)
 425                         && (roothub_a (ohci) & RH_A_NDP) > MAX_ROOT_PORTS) {
 426                 ohci_warn (ohci, "bogus NDP, rereads as NDP=%d\n",
 427                           ohci_readl (ohci, &ohci->regs->roothub.a) & RH_A_NDP);
 428                 /* retry later; "should not happen" */
 429                 goto done;
 430         }
 431
 432         /* init status */
 433         if (roothub_status (ohci) & (RH_HS_LPSC | RH_HS_OCIC))
 434                 buf [0] = changed = 1;
 435         else
 436                 buf [0] = 0;
 437         if (ohci->num_ports > 7) {
 438                 buf [1] = 0;
 439                 length++;
 440         }
 441
 442         /* look at each port */
 443         for (i = 0; i < ohci->num_ports; i++) {
 444                 u32     status = roothub_portstatus (ohci, i);
 445
 446                 /* can't autostop if ports are connected */
 447                 any_connected |= (status & RH_PS_CCS);
 448
 449                 if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC
 450                                 | RH_PS_OCIC | RH_PS_PRSC)) {
 451                         changed = 1;
 452                         if (i < 7)
 453                             buf [0] |= 1 << (i + 1);
 454                         else
 455                             buf [1] |= 1 << (i - 7);
 456                 }
 457         }
 458
 459         hcd->poll_rh = ohci_root_hub_state_changes(ohci, changed,
 460                         any_connected);
 461
 462 done:
 463         spin_unlock_irqrestore (&ohci->lock, flags);
 464
 465         return changed ? length : 0;
 466 }
 467
 468 /*-------------------------------------------------------------------------*/
 469
 470 static void
 471 ohci_hub_descriptor (
 472         struct ohci_hcd                 *ohci,
 473         struct usb_hub_descriptor       *desc
 474 ) {
 475         u32             rh = roothub_a (ohci);
 476         u16             temp;
 477
 478         desc->bDescriptorType = 0x29;
 479         desc->bPwrOn2PwrGood = (rh & RH_A_POTPGT) >> 24;
 480         desc->bHubContrCurrent = 0;
 481
 482         desc->bNbrPorts = ohci->num_ports;
 483         temp = 1 + (ohci->num_ports / 8);
 484         desc->bDescLength = 7 + 2 * temp;
 485
 486         temp = 0;
 487         if (rh & RH_A_NPS)              /* no power switching? */
 488             temp |= 0x0002;
 489         if (rh & RH_A_PSM)              /* per-port power switching? */
 490             temp |= 0x0001;
 491         if (rh & RH_A_NOCP)             /* no overcurrent reporting? */
 492             temp |= 0x0010;
 493         else if (rh & RH_A_OCPM)        /* per-port overcurrent reporting? */
 494             temp |= 0x0008;
 495         desc->wHubCharacteristics = (__force __u16)cpu_to_hc16(ohci, temp);
 496
 497         /* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
 498         rh = roothub_b (ohci);
 499         memset(desc->bitmap, 0xff, sizeof(desc->bitmap));
 500         desc->bitmap [0] = rh & RH_B_DR;
 501         if (ohci->num_ports > 7) {
 502                 desc->bitmap [1] = (rh & RH_B_DR) >> 8;
 503                 desc->bitmap [2] = 0xff;
 504         } else
 505                 desc->bitmap [1] = 0xff;
 506 }
 507
 508 /*-------------------------------------------------------------------------*/
 509
 510 #ifdef  CONFIG_USB_OTG
 511
 512 static int ohci_start_port_reset (struct usb_hcd *hcd, unsigned port)
 513 {
 514         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 515         u32                     status;
 516
 517         if (!port)
 518                 return -EINVAL;
 519         port--;
 520
 521         /* start port reset before HNP protocol times out */
 522         status = ohci_readl(ohci, &ohci->regs->roothub.portstatus [port]);
 523         if (!(status & RH_PS_CCS))
 524                 return -ENODEV;
 525
 526         /* khubd will finish the reset later */
 527         ohci_writel(ohci, RH_PS_PRS, &ohci->regs->roothub.portstatus [port]);
 528         return 0;
 529 }
 530
 531 static void start_hnp(struct ohci_hcd *ohci);
 532
 533 #else
 534
 535 #define ohci_start_port_reset           NULL
 536
 537 #endif
 538
 539 /*-------------------------------------------------------------------------*/
 540
 541
 542 /* See usb 7.1.7.5:  root hubs must issue at least 50 msec reset signaling,
 543  * not necessarily continuous ... to guard against resume signaling.
 544  * The short timeout is safe for non-root hubs, and is backward-compatible
 545  * with earlier Linux hosts.
 546  */
 547 #ifdef  CONFIG_USB_SUSPEND
 548 #define PORT_RESET_MSEC         50
 549 #else
 550 #define PORT_RESET_MSEC         10
 551 #endif
 552
 553 /* this timer value might be vendor-specific ... */
 554 #define PORT_RESET_HW_MSEC      10
 555
 556 /* wrap-aware logic morphed from <linux/jiffies.h> */
 557 #define tick_before(t1,t2) ((s16)(((s16)(t1))-((s16)(t2))) < 0)
 558
 559 /* called from some task, normally khubd */
 560 static inline int root_port_reset (struct ohci_hcd *ohci, unsigned port)
 561 {
 562         __hc32 __iomem *portstat = &ohci->regs->roothub.portstatus [port];
 563         u32     temp;
 564         u16     now = ohci_readl(ohci, &ohci->regs->fmnumber);
 565         u16     reset_done = now + PORT_RESET_MSEC;
 566
 567         /* build a "continuous enough" reset signal, with up to
 568          * 3msec gap between pulses.  scheduler HZ==100 must work;
 569          * this might need to be deadline-scheduled.
 570          */
 571         do {
 572                 /* spin until any current reset finishes */
 573                 for (;;) {
 574                         temp = ohci_readl (ohci, portstat);
 575                         /* handle e.g. CardBus eject */
 576                         if (temp == ~(u32)0)
 577                                 return -ESHUTDOWN;
 578                         if (!(temp & RH_PS_PRS))
 579                                 break;
 580                         udelay (500);
 581                 }
 582
 583                 if (!(temp & RH_PS_CCS))
 584                         break;
 585                 if (temp & RH_PS_PRSC)
 586                         ohci_writel (ohci, RH_PS_PRSC, portstat);
 587
 588                 /* start the next reset, sleep till it's probably done */
 589                 ohci_writel (ohci, RH_PS_PRS, portstat);
 590                 msleep(PORT_RESET_HW_MSEC);
 591                 now = ohci_readl(ohci, &ohci->regs->fmnumber);
 592         } while (tick_before(now, reset_done));
 593         /* caller synchronizes using PRSC */
 594
 595         return 0;
 596 }
 597
 598 static int ohci_hub_control (
 599         struct usb_hcd  *hcd,
 600         u16             typeReq,
 601         u16             wValue,
 602         u16             wIndex,
 603         char            *buf,
 604         u16             wLength
 605 ) {
 606         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 607         int             ports = hcd_to_bus (hcd)->root_hub->maxchild;
 608         u32             temp;
 609         int             retval = 0;
 610
 611         if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
 612                 return -ESHUTDOWN;
 613
 614         switch (typeReq) {
 615         case ClearHubFeature:
 616                 switch (wValue) {
 617                 case C_HUB_OVER_CURRENT:
 618                         ohci_writel (ohci, RH_HS_OCIC,
 619                                         &ohci->regs->roothub.status);
 620                 case C_HUB_LOCAL_POWER:
 621                         break;
 622                 default:
 623                         goto error;
 624                 }
 625                 break;
 626         case ClearPortFeature:
 627                 if (!wIndex || wIndex > ports)
 628                         goto error;
 629                 wIndex--;
 630
 631                 switch (wValue) {
 632                 case USB_PORT_FEAT_ENABLE:
 633                         temp = RH_PS_CCS;
 634                         break;
 635                 case USB_PORT_FEAT_C_ENABLE:
 636                         temp = RH_PS_PESC;
 637                         break;
 638                 case USB_PORT_FEAT_SUSPEND:
 639                         temp = RH_PS_POCI;
 640                         break;
 641                 case USB_PORT_FEAT_C_SUSPEND:
 642                         temp = RH_PS_PSSC;
 643                         break;
 644                 case USB_PORT_FEAT_POWER:
 645                         temp = RH_PS_LSDA;
 646                         break;
 647                 case USB_PORT_FEAT_C_CONNECTION:
 648                         temp = RH_PS_CSC;
 649                         break;
 650                 case USB_PORT_FEAT_C_OVER_CURRENT:
 651                         temp = RH_PS_OCIC;
 652                         break;
 653                 case USB_PORT_FEAT_C_RESET:
 654                         temp = RH_PS_PRSC;
 655                         break;
 656                 default:
 657                         goto error;
 658                 }
 659                 ohci_writel (ohci, temp,
 660                                 &ohci->regs->roothub.portstatus [wIndex]);
 661                 // ohci_readl (ohci, &ohci->regs->roothub.portstatus [wIndex]);
 662                 break;
 663         case GetHubDescriptor:
 664                 ohci_hub_descriptor (ohci, (struct usb_hub_descriptor *) buf);
 665                 break;
 666         case GetHubStatus:
 667                 temp = roothub_status (ohci) & ~(RH_HS_CRWE | RH_HS_DRWE);
 668                 put_unaligned(cpu_to_le32 (temp), (__le32 *) buf);
 669                 break;
 670         case GetPortStatus:
 671                 if (!wIndex || wIndex > ports)
 672                         goto error;
 673                 wIndex--;
 674                 temp = roothub_portstatus (ohci, wIndex);
 675                 put_unaligned(cpu_to_le32 (temp), (__le32 *) buf);
 676
 677 #ifndef OHCI_VERBOSE_DEBUG
 678         if (*(u16*)(buf+2))     /* only if wPortChange is interesting */
 679 #endif
 680                 dbg_port (ohci, "GetStatus", wIndex, temp);
 681                 break;
 682         case SetHubFeature:
 683                 switch (wValue) {
 684                 case C_HUB_OVER_CURRENT:
 685                         // FIXME:  this can be cleared, yes?
 686                 case C_HUB_LOCAL_POWER:
 687                         break;
 688                 default:
 689                         goto error;
 690                 }
 691                 break;
 692         case SetPortFeature:
 693                 if (!wIndex || wIndex > ports)
 694                         goto error;
 695                 wIndex--;
 696                 switch (wValue) {
 697                 case USB_PORT_FEAT_SUSPEND:
 698 #ifdef  CONFIG_USB_OTG
 699                         if (hcd->self.otg_port == (wIndex + 1)
 700                                         && hcd->self.b_hnp_enable)
 701                                 start_hnp(ohci);
 702                         else
 703 #endif
 704                         ohci_writel (ohci, RH_PS_PSS,
 705                                 &ohci->regs->roothub.portstatus [wIndex]);
 706                         break;
 707                 case USB_PORT_FEAT_POWER:
 708                         ohci_writel (ohci, RH_PS_PPS,
 709                                 &ohci->regs->roothub.portstatus [wIndex]);
 710                         break;
 711                 case USB_PORT_FEAT_RESET:
 712                         retval = root_port_reset (ohci, wIndex);
 713                         break;
 714                 default:
 715                         goto error;
 716                 }
 717                 break;
 718
 719         default:
 720 error:
 721                 /* "protocol stall" on error */
 722                 retval = -EPIPE;
 723         }
 724         return retval;
 725 }
 726