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 #if     defined(CONFIG_USB_SUSPEND) || defined(CONFIG_PM)
  40
  41 #define OHCI_SCHED_ENABLES \
  42         (OHCI_CTRL_CLE|OHCI_CTRL_BLE|OHCI_CTRL_PLE|OHCI_CTRL_IE)
  43
  44 static void dl_done_list (struct ohci_hcd *, struct pt_regs *);
  45 static void finish_unlinks (struct ohci_hcd *, u16 , struct pt_regs *);
  46 static int ohci_restart (struct ohci_hcd *ohci);
  47
  48 static int ohci_hub_suspend (struct usb_hcd *hcd)
  49 {
  50         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
  51         int                     status = 0;
  52         unsigned long           flags;
  53
  54         spin_lock_irqsave (&ohci->lock, flags);
  55
  56         ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
  57         switch (ohci->hc_control & OHCI_CTRL_HCFS) {
  58         case OHCI_USB_RESUME:
  59                 ohci_dbg (ohci, "resume/suspend?\n");
  60                 ohci->hc_control &= ~OHCI_CTRL_HCFS;
  61                 ohci->hc_control |= OHCI_USB_RESET;
  62                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
  63                 (void) ohci_readl (ohci, &ohci->regs->control);
  64                 /* FALL THROUGH */
  65         case OHCI_USB_RESET:
  66                 status = -EBUSY;
  67                 ohci_dbg (ohci, "needs reinit!\n");
  68                 goto done;
  69         case OHCI_USB_SUSPEND:
  70                 ohci_dbg (ohci, "already suspended\n");
  71                 goto done;
  72         }
  73         ohci_dbg (ohci, "suspend root hub\n");
  74
  75         /* First stop any processing */
  76         hcd->state = USB_STATE_QUIESCING;
  77         if (ohci->hc_control & OHCI_SCHED_ENABLES) {
  78                 int             limit;
  79
  80                 ohci->hc_control &= ~OHCI_SCHED_ENABLES;
  81                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
  82                 ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
  83                 ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrstatus);
  84
  85                 /* sched disables take effect on the next frame,
  86                  * then the last WDH could take 6+ msec
  87                  */
  88                 ohci_dbg (ohci, "stopping schedules ...\n");
  89                 limit = 2000;
  90                 while (limit > 0) {
  91                         udelay (250);
  92                         limit =- 250;
  93                         if (ohci_readl (ohci, &ohci->regs->intrstatus)
  94                                         & OHCI_INTR_SF)
  95                                 break;
  96                 }
  97                 dl_done_list (ohci, NULL);
  98                 mdelay (7);
  99         }
 100         dl_done_list (ohci, NULL);
 101         finish_unlinks (ohci, ohci_frame_no(ohci), NULL);
 102         ohci_writel (ohci, ohci_readl (ohci, &ohci->regs->intrstatus),
 103                         &ohci->regs->intrstatus);
 104
 105         /* maybe resume can wake root hub */
 106         if (hcd->remote_wakeup)
 107                 ohci->hc_control |= OHCI_CTRL_RWE;
 108         else
 109                 ohci->hc_control &= ~OHCI_CTRL_RWE;
 110
 111         /* Suspend hub */
 112         ohci->hc_control &= ~OHCI_CTRL_HCFS;
 113         ohci->hc_control |= OHCI_USB_SUSPEND;
 114         ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 115         (void) ohci_readl (ohci, &ohci->regs->control);
 116
 117         /* no resumes until devices finish suspending */
 118         ohci->next_statechange = jiffies + msecs_to_jiffies (5);
 119
 120 done:
 121         if (status == 0)
 122                 hcd->state = HCD_STATE_SUSPENDED;
 123         spin_unlock_irqrestore (&ohci->lock, flags);
 124         return status;
 125 }
 126
 127 static inline struct ed *find_head (struct ed *ed)
 128 {
 129         /* for bulk and control lists */
 130         while (ed->ed_prev)
 131                 ed = ed->ed_prev;
 132         return ed;
 133 }
 134
 135 /* caller has locked the root hub */
 136 static int ohci_hub_resume (struct usb_hcd *hcd)
 137 {
 138         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
 139         u32                     temp, enables;
 140         int                     status = -EINPROGRESS;
 141
 142         if (time_before (jiffies, ohci->next_statechange))
 143                 msleep(5);
 144
 145         spin_lock_irq (&ohci->lock);
 146         ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
 147
 148         if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) {
 149                 /* this can happen after suspend-to-disk */
 150                 if (hcd->state == USB_STATE_RESUMING) {
 151                         ohci_dbg (ohci, "BIOS/SMM active, control %03x\n",
 152                                         ohci->hc_control);
 153                         status = -EBUSY;
 154                 /* this happens when pmcore resumes HC then root */
 155                 } else {
 156                         ohci_dbg (ohci, "duplicate resume\n");
 157                         status = 0;
 158                 }
 159         } else switch (ohci->hc_control & OHCI_CTRL_HCFS) {
 160         case OHCI_USB_SUSPEND:
 161                 ohci->hc_control &= ~(OHCI_CTRL_HCFS|OHCI_SCHED_ENABLES);
 162                 ohci->hc_control |= OHCI_USB_RESUME;
 163                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 164                 (void) ohci_readl (ohci, &ohci->regs->control);
 165                 ohci_dbg (ohci, "resume root hub\n");
 166                 break;
 167         case OHCI_USB_RESUME:
 168                 /* HCFS changes sometime after INTR_RD */
 169                 ohci_info (ohci, "wakeup\n");
 170                 break;
 171         case OHCI_USB_OPER:
 172                 ohci_dbg (ohci, "odd resume\n");
 173                 status = 0;
 174                 break;
 175         default:                /* RESET, we lost power */
 176                 ohci_dbg (ohci, "root hub hardware reset\n");
 177                 status = -EBUSY;
 178         }
 179         spin_unlock_irq (&ohci->lock);
 180         if (status == -EBUSY) {
 181                 (void) ohci_init (ohci);
 182                 return ohci_restart (ohci);
 183         }
 184         if (status != -EINPROGRESS)
 185                 return status;
 186
 187         temp = roothub_a (ohci) & RH_A_NDP;
 188         enables = 0;
 189         while (temp--) {
 190                 u32 stat = ohci_readl (ohci,
 191                                        &ohci->regs->roothub.portstatus [temp]);
 192
 193                 /* force global, not selective, resume */
 194                 if (!(stat & RH_PS_PSS))
 195                         continue;
 196                 ohci_writel (ohci, RH_PS_POCI,
 197                                 &ohci->regs->roothub.portstatus [temp]);
 198         }
 199
 200         /* Some controllers (lucent) need extra-long delays */
 201         hcd->state = USB_STATE_RESUMING;
 202         mdelay (20 /* usb 11.5.1.10 */ + 15);
 203
 204         temp = ohci_readl (ohci, &ohci->regs->control);
 205         temp &= OHCI_CTRL_HCFS;
 206         if (temp != OHCI_USB_RESUME) {
 207                 ohci_err (ohci, "controller won't resume\n");
 208                 return -EBUSY;
 209         }
 210
 211         /* disable old schedule state, reinit from scratch */
 212         ohci_writel (ohci, 0, &ohci->regs->ed_controlhead);
 213         ohci_writel (ohci, 0, &ohci->regs->ed_controlcurrent);
 214         ohci_writel (ohci, 0, &ohci->regs->ed_bulkhead);
 215         ohci_writel (ohci, 0, &ohci->regs->ed_bulkcurrent);
 216         ohci_writel (ohci, 0, &ohci->regs->ed_periodcurrent);
 217         ohci_writel (ohci, (u32) ohci->hcca_dma, &ohci->regs->hcca);
 218
 219         periodic_reinit (ohci);
 220
 221         /* interrupts might have been disabled */
 222         ohci_writel (ohci, OHCI_INTR_INIT, &ohci->regs->intrenable);
 223         if (ohci->ed_rm_list)
 224                 ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrenable);
 225         ohci_writel (ohci, ohci_readl (ohci, &ohci->regs->intrstatus),
 226                         &ohci->regs->intrstatus);
 227
 228         /* Then re-enable operations */
 229         ohci_writel (ohci, OHCI_USB_OPER, &ohci->regs->control);
 230         (void) ohci_readl (ohci, &ohci->regs->control);
 231         msleep (3);
 232
 233         temp = OHCI_CONTROL_INIT | OHCI_USB_OPER;
 234         if (hcd->can_wakeup)
 235                 temp |= OHCI_CTRL_RWC;
 236         ohci->hc_control = temp;
 237         ohci_writel (ohci, temp, &ohci->regs->control);
 238         (void) ohci_readl (ohci, &ohci->regs->control);
 239
 240         /* TRSMRCY */
 241         msleep (10);
 242
 243         /* keep it alive for ~5x suspend + resume costs */
 244         ohci->next_statechange = jiffies + msecs_to_jiffies (250);
 245
 246         /* maybe turn schedules back on */
 247         enables = 0;
 248         temp = 0;
 249         if (!ohci->ed_rm_list) {
 250                 if (ohci->ed_controltail) {
 251                         ohci_writel (ohci,
 252                                         find_head (ohci->ed_controltail)->dma,
 253                                         &ohci->regs->ed_controlhead);
 254                         enables |= OHCI_CTRL_CLE;
 255                         temp |= OHCI_CLF;
 256                 }
 257                 if (ohci->ed_bulktail) {
 258                         ohci_writel (ohci, find_head (ohci->ed_bulktail)->dma,
 259                                 &ohci->regs->ed_bulkhead);
 260                         enables |= OHCI_CTRL_BLE;
 261                         temp |= OHCI_BLF;
 262                 }
 263         }
 264         if (hcd->self.bandwidth_isoc_reqs || hcd->self.bandwidth_int_reqs)
 265                 enables |= OHCI_CTRL_PLE|OHCI_CTRL_IE;
 266         if (enables) {
 267                 ohci_dbg (ohci, "restarting schedules ... %08x\n", enables);
 268                 ohci->hc_control |= enables;
 269                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 270                 if (temp)
 271                         ohci_writel (ohci, temp, &ohci->regs->cmdstatus);
 272                 (void) ohci_readl (ohci, &ohci->regs->control);
 273         }
 274
 275         hcd->state = USB_STATE_RUNNING;
 276         return 0;
 277 }
 278
 279 static void ohci_rh_resume (void *_hcd)
 280 {
 281         struct usb_hcd  *hcd = _hcd;
 282
 283         usb_lock_device (hcd->self.root_hub);
 284         (void) ohci_hub_resume (hcd);
 285         usb_unlock_device (hcd->self.root_hub);
 286 }
 287
 288 #else
 289
 290 static void ohci_rh_resume (void *_hcd)
 291 {
 292         struct ohci_hcd *ohci = hcd_to_ohci (_hcd);
 293         ohci_dbg(ohci, "rh_resume ??\n");
 294 }
 295
 296 #endif  /* CONFIG_USB_SUSPEND || CONFIG_PM */
 297
 298 /*-------------------------------------------------------------------------*/
 299
 300 /* build "status change" packet (one or two bytes) from HC registers */
 301
 302 static int
 303 ohci_hub_status_data (struct usb_hcd *hcd, char *buf)
 304 {
 305         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 306         int             ports, i, changed = 0, length = 1;
 307         int             can_suspend = hcd->can_wakeup;
 308         unsigned long   flags;
 309
 310         spin_lock_irqsave (&ohci->lock, flags);
 311
 312         /* handle autosuspended root:  finish resuming before
 313          * letting khubd or root hub timer see state changes.
 314          */
 315         if ((ohci->hc_control & OHCI_CTRL_HCFS) != OHCI_USB_OPER
 316                         || !HCD_IS_RUNNING(hcd->state)) {
 317                 can_suspend = 0;
 318                 goto done;
 319         }
 320
 321         ports = roothub_a (ohci) & RH_A_NDP;
 322         if (ports > MAX_ROOT_PORTS) {
 323                 ohci_err (ohci, "bogus NDP=%d, rereads as NDP=%d\n", ports,
 324                           ohci_readl (ohci, &ohci->regs->roothub.a) & RH_A_NDP);
 325                 /* retry later; "should not happen" */
 326                 goto done;
 327         }
 328
 329         /* init status */
 330         if (roothub_status (ohci) & (RH_HS_LPSC | RH_HS_OCIC))
 331                 buf [0] = changed = 1;
 332         else
 333                 buf [0] = 0;
 334         if (ports > 7) {
 335                 buf [1] = 0;
 336                 length++;
 337         }
 338
 339         /* look at each port */
 340         for (i = 0; i < ports; i++) {
 341                 u32     status = roothub_portstatus (ohci, i);
 342
 343                 if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC
 344                                 | RH_PS_OCIC | RH_PS_PRSC)) {
 345                         changed = 1;
 346                         if (i < 7)
 347                             buf [0] |= 1 << (i + 1);
 348                         else
 349                             buf [1] |= 1 << (i - 7);
 350                         continue;
 351                 }
 352
 353                 /* can suspend if no ports are enabled; or if all all
 354                  * enabled ports are suspended AND remote wakeup is on.
 355                  */
 356                 if (!(status & RH_PS_CCS))
 357                         continue;
 358                 if ((status & RH_PS_PSS) && hcd->remote_wakeup)
 359                         continue;
 360                 can_suspend = 0;
 361         }
 362 done:
 363         spin_unlock_irqrestore (&ohci->lock, flags);
 364
 365 #ifdef CONFIG_PM
 366         /* save power by suspending idle root hubs;
 367          * INTR_RD wakes us when there's work
 368          * NOTE: if we can do this, we don't need a root hub timer!
 369          */
 370         if (can_suspend
 371                         && !changed
 372                         && !ohci->ed_rm_list
 373                         && ((OHCI_CTRL_HCFS | OHCI_SCHED_ENABLES)
 374                                         & ohci->hc_control)
 375                                 == OHCI_USB_OPER
 376                         && time_after (jiffies, ohci->next_statechange)
 377                         && usb_trylock_device (hcd->self.root_hub)
 378                         ) {
 379                 ohci_vdbg (ohci, "autosuspend\n");
 380                 (void) ohci_hub_suspend (hcd);
 381                 hcd->state = USB_STATE_RUNNING;
 382                 usb_unlock_device (hcd->self.root_hub);
 383         }
 384 #endif
 385
 386         return changed ? length : 0;
 387 }
 388
 389 /*-------------------------------------------------------------------------*/
 390
 391 static void
 392 ohci_hub_descriptor (
 393         struct ohci_hcd                 *ohci,
 394         struct usb_hub_descriptor       *desc
 395 ) {
 396         u32             rh = roothub_a (ohci);
 397         int             ports = rh & RH_A_NDP;
 398         u16             temp;
 399
 400         desc->bDescriptorType = 0x29;
 401         desc->bPwrOn2PwrGood = (rh & RH_A_POTPGT) >> 24;
 402         desc->bHubContrCurrent = 0;
 403
 404         desc->bNbrPorts = ports;
 405         temp = 1 + (ports / 8);
 406         desc->bDescLength = 7 + 2 * temp;
 407
 408         temp = 0;
 409         if (rh & RH_A_NPS)              /* no power switching? */
 410             temp |= 0x0002;
 411         if (rh & RH_A_PSM)              /* per-port power switching? */
 412             temp |= 0x0001;
 413         if (rh & RH_A_NOCP)             /* no overcurrent reporting? */
 414             temp |= 0x0010;
 415         else if (rh & RH_A_OCPM)        /* per-port overcurrent reporting? */
 416             temp |= 0x0008;
 417         desc->wHubCharacteristics = (__force __u16)cpu_to_hc16(ohci, temp);
 418
 419         /* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
 420         rh = roothub_b (ohci);
 421         desc->bitmap [0] = rh & RH_B_DR;
 422         if (ports > 7) {
 423                 desc->bitmap [1] = (rh & RH_B_DR) >> 8;
 424                 desc->bitmap [2] = desc->bitmap [3] = 0xff;
 425         } else
 426                 desc->bitmap [1] = 0xff;
 427 }
 428
 429 /*-------------------------------------------------------------------------*/
 430
 431 #ifdef  CONFIG_USB_OTG
 432
 433 static int ohci_start_port_reset (struct usb_hcd *hcd, unsigned port)
 434 {
 435         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 436         u32                     status;
 437
 438         if (!port)
 439                 return -EINVAL;
 440         port--;
 441
 442         /* start port reset before HNP protocol times out */
 443         status = ohci_readl(ohci, &ohci->regs->roothub.portstatus [port]);
 444         if (!(status & RH_PS_CCS))
 445                 return -ENODEV;
 446
 447         /* khubd will finish the reset later */
 448         ohci_writel(ohci, RH_PS_PRS, &ohci->regs->roothub.portstatus [port]);
 449         return 0;
 450 }
 451
 452 static void start_hnp(struct ohci_hcd *ohci);
 453
 454 #else
 455
 456 #define ohci_start_port_reset           NULL
 457
 458 #endif
 459
 460 /*-------------------------------------------------------------------------*/
 461
 462
 463 /* See usb 7.1.7.5:  root hubs must issue at least 50 msec reset signaling,
 464  * not necessarily continuous ... to guard against resume signaling.
 465  * The short timeout is safe for non-root hubs, and is backward-compatible
 466  * with earlier Linux hosts.
 467  */
 468 #ifdef  CONFIG_USB_SUSPEND
 469 #define PORT_RESET_MSEC         50
 470 #else
 471 #define PORT_RESET_MSEC         10
 472 #endif
 473
 474 /* this timer value might be vendor-specific ... */
 475 #define PORT_RESET_HW_MSEC      10
 476
 477 /* wrap-aware logic morphed from <linux/jiffies.h> */
 478 #define tick_before(t1,t2) ((s16)(((s16)(t1))-((s16)(t2))) < 0)
 479
 480 /* called from some task, normally khubd */
 481 static inline void root_port_reset (struct ohci_hcd *ohci, unsigned port)
 482 {
 483         __hc32 __iomem *portstat = &ohci->regs->roothub.portstatus [port];
 484         u32     temp;
 485         u16     now = ohci_readl(ohci, &ohci->regs->fmnumber);
 486         u16     reset_done = now + PORT_RESET_MSEC;
 487
 488         /* build a "continuous enough" reset signal, with up to
 489          * 3msec gap between pulses.  scheduler HZ==100 must work;
 490          * this might need to be deadline-scheduled.
 491          */
 492         do {
 493                 /* spin until any current reset finishes */
 494                 for (;;) {
 495                         temp = ohci_readl (ohci, portstat);
 496                         if (!(temp & RH_PS_PRS))
 497                                 break;
 498                         udelay (500);
 499                 }
 500
 501                 if (!(temp & RH_PS_CCS))
 502                         break;
 503                 if (temp & RH_PS_PRSC)
 504                         ohci_writel (ohci, RH_PS_PRSC, portstat);
 505
 506                 /* start the next reset, sleep till it's probably done */
 507                 ohci_writel (ohci, RH_PS_PRS, portstat);
 508                 msleep(PORT_RESET_HW_MSEC);
 509                 now = ohci_readl(ohci, &ohci->regs->fmnumber);
 510         } while (tick_before(now, reset_done));
 511         /* caller synchronizes using PRSC */
 512 }
 513
 514 static int ohci_hub_control (
 515         struct usb_hcd  *hcd,
 516         u16             typeReq,
 517         u16             wValue,
 518         u16             wIndex,
 519         char            *buf,
 520         u16             wLength
 521 ) {
 522         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 523         int             ports = hcd_to_bus (hcd)->root_hub->maxchild;
 524         u32             temp;
 525         int             retval = 0;
 526
 527         switch (typeReq) {
 528         case ClearHubFeature:
 529                 switch (wValue) {
 530                 case C_HUB_OVER_CURRENT:
 531                         ohci_writel (ohci, RH_HS_OCIC,
 532                                         &ohci->regs->roothub.status);
 533                 case C_HUB_LOCAL_POWER:
 534                         break;
 535                 default:
 536                         goto error;
 537                 }
 538                 break;
 539         case ClearPortFeature:
 540                 if (!wIndex || wIndex > ports)
 541                         goto error;
 542                 wIndex--;
 543
 544                 switch (wValue) {
 545                 case USB_PORT_FEAT_ENABLE:
 546                         temp = RH_PS_CCS;
 547                         break;
 548                 case USB_PORT_FEAT_C_ENABLE:
 549                         temp = RH_PS_PESC;
 550                         break;
 551                 case USB_PORT_FEAT_SUSPEND:
 552                         temp = RH_PS_POCI;
 553                         if ((ohci->hc_control & OHCI_CTRL_HCFS)
 554                                         != OHCI_USB_OPER)
 555                                 schedule_work (&ohci->rh_resume);
 556                         break;
 557                 case USB_PORT_FEAT_C_SUSPEND:
 558                         temp = RH_PS_PSSC;
 559                         break;
 560                 case USB_PORT_FEAT_POWER:
 561                         temp = RH_PS_LSDA;
 562                         break;
 563                 case USB_PORT_FEAT_C_CONNECTION:
 564                         temp = RH_PS_CSC;
 565                         break;
 566                 case USB_PORT_FEAT_C_OVER_CURRENT:
 567                         temp = RH_PS_OCIC;
 568                         break;
 569                 case USB_PORT_FEAT_C_RESET:
 570                         temp = RH_PS_PRSC;
 571                         break;
 572                 default:
 573                         goto error;
 574                 }
 575                 ohci_writel (ohci, temp,
 576                                 &ohci->regs->roothub.portstatus [wIndex]);
 577                 // ohci_readl (ohci, &ohci->regs->roothub.portstatus [wIndex]);
 578                 break;
 579         case GetHubDescriptor:
 580                 ohci_hub_descriptor (ohci, (struct usb_hub_descriptor *) buf);
 581                 break;
 582         case GetHubStatus:
 583                 temp = roothub_status (ohci) & ~(RH_HS_CRWE | RH_HS_DRWE);
 584                 *(__le32 *) buf = cpu_to_le32 (temp);
 585                 break;
 586         case GetPortStatus:
 587                 if (!wIndex || wIndex > ports)
 588                         goto error;
 589                 wIndex--;
 590                 temp = roothub_portstatus (ohci, wIndex);
 591                 *(__le32 *) buf = cpu_to_le32 (temp);
 592
 593 #ifndef OHCI_VERBOSE_DEBUG
 594         if (*(u16*)(buf+2))     /* only if wPortChange is interesting */
 595 #endif
 596                 dbg_port (ohci, "GetStatus", wIndex, temp);
 597                 break;
 598         case SetHubFeature:
 599                 switch (wValue) {
 600                 case C_HUB_OVER_CURRENT:
 601                         // FIXME:  this can be cleared, yes?
 602                 case C_HUB_LOCAL_POWER:
 603                         break;
 604                 default:
 605                         goto error;
 606                 }
 607                 break;
 608         case SetPortFeature:
 609                 if (!wIndex || wIndex > ports)
 610                         goto error;
 611                 wIndex--;
 612                 switch (wValue) {
 613                 case USB_PORT_FEAT_SUSPEND:
 614 #ifdef  CONFIG_USB_OTG
 615                         if (hcd->self.otg_port == (wIndex + 1)
 616                                         && hcd->self.b_hnp_enable)
 617                                 start_hnp(ohci);
 618                         else
 619 #endif
 620                         ohci_writel (ohci, RH_PS_PSS,
 621                                 &ohci->regs->roothub.portstatus [wIndex]);
 622                         break;
 623                 case USB_PORT_FEAT_POWER:
 624                         ohci_writel (ohci, RH_PS_PPS,
 625                                 &ohci->regs->roothub.portstatus [wIndex]);
 626                         break;
 627                 case USB_PORT_FEAT_RESET:
 628                         root_port_reset (ohci, wIndex);
 629                         break;
 630                 default:
 631                         goto error;
 632                 }
 633                 break;
 634
 635         default:
 636 error:
 637                 /* "protocol stall" on error */
 638                 retval = -EPIPE;
 639         }
 640         return retval;
 641 }
 642