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 = HC_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 = HC_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 == HC_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, "already resumed\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 erratum) need extra-long delays */
 201         hcd->state = HC_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         /* Sometimes PCI D3 suspend trashes frame timings ... */
 220         periodic_reinit (ohci);
 221
 222         /* interrupts might have been disabled */
 223         ohci_writel (ohci, OHCI_INTR_INIT, &ohci->regs->intrenable);
 224         if (ohci->ed_rm_list)
 225                 ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrenable);
 226         ohci_writel (ohci, ohci_readl (ohci, &ohci->regs->intrstatus),
 227                         &ohci->regs->intrstatus);
 228
 229         /* Then re-enable operations */
 230         ohci_writel (ohci, OHCI_USB_OPER, &ohci->regs->control);
 231         (void) ohci_readl (ohci, &ohci->regs->control);
 232         msleep (3);
 233
 234         temp = OHCI_CONTROL_INIT | OHCI_USB_OPER;
 235         if (hcd->can_wakeup)
 236                 temp |= OHCI_CTRL_RWC;
 237         ohci->hc_control = temp;
 238         ohci_writel (ohci, temp, &ohci->regs->control);
 239         (void) ohci_readl (ohci, &ohci->regs->control);
 240
 241         /* TRSMRCY */
 242         msleep (10);
 243
 244         /* keep it alive for ~5x suspend + resume costs */
 245         ohci->next_statechange = jiffies + msecs_to_jiffies (250);
 246
 247         /* maybe turn schedules back on */
 248         enables = 0;
 249         temp = 0;
 250         if (!ohci->ed_rm_list) {
 251                 if (ohci->ed_controltail) {
 252                         ohci_writel (ohci,
 253                                         find_head (ohci->ed_controltail)->dma,
 254                                         &ohci->regs->ed_controlhead);
 255                         enables |= OHCI_CTRL_CLE;
 256                         temp |= OHCI_CLF;
 257                 }
 258                 if (ohci->ed_bulktail) {
 259                         ohci_writel (ohci, find_head (ohci->ed_bulktail)->dma,
 260                                 &ohci->regs->ed_bulkhead);
 261                         enables |= OHCI_CTRL_BLE;
 262                         temp |= OHCI_BLF;
 263                 }
 264         }
 265         if (hcd->self.bandwidth_isoc_reqs || hcd->self.bandwidth_int_reqs)
 266                 enables |= OHCI_CTRL_PLE|OHCI_CTRL_IE;
 267         if (enables) {
 268                 ohci_dbg (ohci, "restarting schedules ... %08x\n", enables);
 269                 ohci->hc_control |= enables;
 270                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 271                 if (temp)
 272                         ohci_writel (ohci, temp, &ohci->regs->cmdstatus);
 273                 (void) ohci_readl (ohci, &ohci->regs->control);
 274         }
 275
 276         hcd->state = HC_STATE_RUNNING;
 277         return 0;
 278 }
 279
 280 static void ohci_rh_resume (void *_hcd)
 281 {
 282         struct usb_hcd  *hcd = _hcd;
 283
 284         usb_lock_device (hcd->self.root_hub);
 285         (void) ohci_hub_resume (hcd);
 286         usb_unlock_device (hcd->self.root_hub);
 287 }
 288
 289 #else
 290
 291 static void ohci_rh_resume (void *_hcd)
 292 {
 293         struct ohci_hcd *ohci = hcd_to_ohci (_hcd);
 294         ohci_dbg(ohci, "rh_resume ??\n");
 295 }
 296
 297 #endif  /* CONFIG_USB_SUSPEND || CONFIG_PM */
 298
 299 /*-------------------------------------------------------------------------*/
 300
 301 /* build "status change" packet (one or two bytes) from HC registers */
 302
 303 static int
 304 ohci_hub_status_data (struct usb_hcd *hcd, char *buf)
 305 {
 306         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 307         int             ports, i, changed = 0, length = 1;
 308         int             can_suspend = hcd->can_wakeup;
 309         unsigned long   flags;
 310
 311         spin_lock_irqsave (&ohci->lock, flags);
 312
 313         /* handle autosuspended root:  finish resuming before
 314          * letting khubd or root hub timer see state changes.
 315          */
 316         if ((ohci->hc_control & OHCI_CTRL_HCFS) != OHCI_USB_OPER
 317                         || !HC_IS_RUNNING(hcd->state)) {
 318                 can_suspend = 0;
 319                 goto done;
 320         }
 321
 322         ports = roothub_a (ohci) & RH_A_NDP;
 323         if (ports > MAX_ROOT_PORTS) {
 324                 ohci_err (ohci, "bogus NDP=%d, rereads as NDP=%d\n", ports,
 325                           ohci_readl (ohci, &ohci->regs->roothub.a) & RH_A_NDP);
 326                 /* retry later; "should not happen" */
 327                 goto done;
 328         }
 329
 330         /* init status */
 331         if (roothub_status (ohci) & (RH_HS_LPSC | RH_HS_OCIC))
 332                 buf [0] = changed = 1;
 333         else
 334                 buf [0] = 0;
 335         if (ports > 7) {
 336                 buf [1] = 0;
 337                 length++;
 338         }
 339
 340         /* look at each port */
 341         for (i = 0; i < ports; i++) {
 342                 u32     status = roothub_portstatus (ohci, i);
 343
 344                 if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC
 345                                 | RH_PS_OCIC | RH_PS_PRSC)) {
 346                         changed = 1;
 347                         if (i < 7)
 348                             buf [0] |= 1 << (i + 1);
 349                         else
 350                             buf [1] |= 1 << (i - 7);
 351                         continue;
 352                 }
 353
 354                 /* can suspend if no ports are enabled; or if all all
 355                  * enabled ports are suspended AND remote wakeup is on.
 356                  */
 357                 if (!(status & RH_PS_CCS))
 358                         continue;
 359                 if ((status & RH_PS_PSS) && hcd->remote_wakeup)
 360                         continue;
 361                 can_suspend = 0;
 362         }
 363 done:
 364         spin_unlock_irqrestore (&ohci->lock, flags);
 365
 366 #ifdef CONFIG_PM
 367         /* save power by suspending idle root hubs;
 368          * INTR_RD wakes us when there's work
 369          * NOTE: if we can do this, we don't need a root hub timer!
 370          */
 371         if (can_suspend
 372                         && !changed
 373                         && !ohci->ed_rm_list
 374                         && ((OHCI_CTRL_HCFS | OHCI_SCHED_ENABLES)
 375                                         & ohci->hc_control)
 376                                 == OHCI_USB_OPER
 377                         && time_after (jiffies, ohci->next_statechange)
 378                         && usb_trylock_device (hcd->self.root_hub)
 379                         ) {
 380                 ohci_vdbg (ohci, "autosuspend\n");
 381                 (void) ohci_hub_suspend (hcd);
 382                 hcd->state = HC_STATE_RUNNING;
 383                 usb_unlock_device (hcd->self.root_hub);
 384         }
 385 #endif
 386
 387         return changed ? length : 0;
 388 }
 389
 390 /*-------------------------------------------------------------------------*/
 391
 392 static void
 393 ohci_hub_descriptor (
 394         struct ohci_hcd                 *ohci,
 395         struct usb_hub_descriptor       *desc
 396 ) {
 397         u32             rh = roothub_a (ohci);
 398         int             ports = rh & RH_A_NDP;
 399         u16             temp;
 400
 401         desc->bDescriptorType = 0x29;
 402         desc->bPwrOn2PwrGood = (rh & RH_A_POTPGT) >> 24;
 403         desc->bHubContrCurrent = 0;
 404
 405         desc->bNbrPorts = ports;
 406         temp = 1 + (ports / 8);
 407         desc->bDescLength = 7 + 2 * temp;
 408
 409         temp = 0;
 410         if (rh & RH_A_NPS)              /* no power switching? */
 411             temp |= 0x0002;
 412         if (rh & RH_A_PSM)              /* per-port power switching? */
 413             temp |= 0x0001;
 414         if (rh & RH_A_NOCP)             /* no overcurrent reporting? */
 415             temp |= 0x0010;
 416         else if (rh & RH_A_OCPM)        /* per-port overcurrent reporting? */
 417             temp |= 0x0008;
 418         desc->wHubCharacteristics = (__force __u16)cpu_to_hc16(ohci, temp);
 419
 420         /* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
 421         rh = roothub_b (ohci);
 422         memset(desc->bitmap, 0xff, sizeof(desc->bitmap));
 423         desc->bitmap [0] = rh & RH_B_DR;
 424         if (ports > 7) {
 425                 desc->bitmap [1] = (rh & RH_B_DR) >> 8;
 426                 desc->bitmap [2] = 0xff;
 427         } else
 428                 desc->bitmap [1] = 0xff;
 429 }
 430
 431 /*-------------------------------------------------------------------------*/
 432
 433 #ifdef  CONFIG_USB_OTG
 434
 435 static int ohci_start_port_reset (struct usb_hcd *hcd, unsigned port)
 436 {
 437         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 438         u32                     status;
 439
 440         if (!port)
 441                 return -EINVAL;
 442         port--;
 443
 444         /* start port reset before HNP protocol times out */
 445         status = ohci_readl(ohci, &ohci->regs->roothub.portstatus [port]);
 446         if (!(status & RH_PS_CCS))
 447                 return -ENODEV;
 448
 449         /* khubd will finish the reset later */
 450         ohci_writel(ohci, RH_PS_PRS, &ohci->regs->roothub.portstatus [port]);
 451         return 0;
 452 }
 453
 454 static void start_hnp(struct ohci_hcd *ohci);
 455
 456 #else
 457
 458 #define ohci_start_port_reset           NULL
 459
 460 #endif
 461
 462 /*-------------------------------------------------------------------------*/
 463
 464
 465 /* See usb 7.1.7.5:  root hubs must issue at least 50 msec reset signaling,
 466  * not necessarily continuous ... to guard against resume signaling.
 467  * The short timeout is safe for non-root hubs, and is backward-compatible
 468  * with earlier Linux hosts.
 469  */
 470 #ifdef  CONFIG_USB_SUSPEND
 471 #define PORT_RESET_MSEC         50
 472 #else
 473 #define PORT_RESET_MSEC         10
 474 #endif
 475
 476 /* this timer value might be vendor-specific ... */
 477 #define PORT_RESET_HW_MSEC      10
 478
 479 /* wrap-aware logic morphed from <linux/jiffies.h> */
 480 #define tick_before(t1,t2) ((s16)(((s16)(t1))-((s16)(t2))) < 0)
 481
 482 /* called from some task, normally khubd */
 483 static inline void root_port_reset (struct ohci_hcd *ohci, unsigned port)
 484 {
 485         __hc32 __iomem *portstat = &ohci->regs->roothub.portstatus [port];
 486         u32     temp;
 487         u16     now = ohci_readl(ohci, &ohci->regs->fmnumber);
 488         u16     reset_done = now + PORT_RESET_MSEC;
 489
 490         /* build a "continuous enough" reset signal, with up to
 491          * 3msec gap between pulses.  scheduler HZ==100 must work;
 492          * this might need to be deadline-scheduled.
 493          */
 494         do {
 495                 /* spin until any current reset finishes */
 496                 for (;;) {
 497                         temp = ohci_readl (ohci, portstat);
 498                         if (!(temp & RH_PS_PRS))
 499                                 break;
 500                         udelay (500);
 501                 }
 502
 503                 if (!(temp & RH_PS_CCS))
 504                         break;
 505                 if (temp & RH_PS_PRSC)
 506                         ohci_writel (ohci, RH_PS_PRSC, portstat);
 507
 508                 /* start the next reset, sleep till it's probably done */
 509                 ohci_writel (ohci, RH_PS_PRS, portstat);
 510                 msleep(PORT_RESET_HW_MSEC);
 511                 now = ohci_readl(ohci, &ohci->regs->fmnumber);
 512         } while (tick_before(now, reset_done));
 513         /* caller synchronizes using PRSC */
 514 }
 515
 516 static int ohci_hub_control (
 517         struct usb_hcd  *hcd,
 518         u16             typeReq,
 519         u16             wValue,
 520         u16             wIndex,
 521         char            *buf,
 522         u16             wLength
 523 ) {
 524         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 525         int             ports = hcd_to_bus (hcd)->root_hub->maxchild;
 526         u32             temp;
 527         int             retval = 0;
 528
 529         switch (typeReq) {
 530         case ClearHubFeature:
 531                 switch (wValue) {
 532                 case C_HUB_OVER_CURRENT:
 533                         ohci_writel (ohci, RH_HS_OCIC,
 534                                         &ohci->regs->roothub.status);
 535                 case C_HUB_LOCAL_POWER:
 536                         break;
 537                 default:
 538                         goto error;
 539                 }
 540                 break;
 541         case ClearPortFeature:
 542                 if (!wIndex || wIndex > ports)
 543                         goto error;
 544                 wIndex--;
 545
 546                 switch (wValue) {
 547                 case USB_PORT_FEAT_ENABLE:
 548                         temp = RH_PS_CCS;
 549                         break;
 550                 case USB_PORT_FEAT_C_ENABLE:
 551                         temp = RH_PS_PESC;
 552                         break;
 553                 case USB_PORT_FEAT_SUSPEND:
 554                         temp = RH_PS_POCI;
 555                         if ((ohci->hc_control & OHCI_CTRL_HCFS)
 556                                         != OHCI_USB_OPER)
 557                                 schedule_work (&ohci->rh_resume);
 558                         break;
 559                 case USB_PORT_FEAT_C_SUSPEND:
 560                         temp = RH_PS_PSSC;
 561                         break;
 562                 case USB_PORT_FEAT_POWER:
 563                         temp = RH_PS_LSDA;
 564                         break;
 565                 case USB_PORT_FEAT_C_CONNECTION:
 566                         temp = RH_PS_CSC;
 567                         break;
 568                 case USB_PORT_FEAT_C_OVER_CURRENT:
 569                         temp = RH_PS_OCIC;
 570                         break;
 571                 case USB_PORT_FEAT_C_RESET:
 572                         temp = RH_PS_PRSC;
 573                         break;
 574                 default:
 575                         goto error;
 576                 }
 577                 ohci_writel (ohci, temp,
 578                                 &ohci->regs->roothub.portstatus [wIndex]);
 579                 // ohci_readl (ohci, &ohci->regs->roothub.portstatus [wIndex]);
 580                 break;
 581         case GetHubDescriptor:
 582                 ohci_hub_descriptor (ohci, (struct usb_hub_descriptor *) buf);
 583                 break;
 584         case GetHubStatus:
 585                 temp = roothub_status (ohci) & ~(RH_HS_CRWE | RH_HS_DRWE);
 586                 *(__le32 *) buf = cpu_to_le32 (temp);
 587                 break;
 588         case GetPortStatus:
 589                 if (!wIndex || wIndex > ports)
 590                         goto error;
 591                 wIndex--;
 592                 temp = roothub_portstatus (ohci, wIndex);
 593                 *(__le32 *) buf = cpu_to_le32 (temp);
 594
 595 #ifndef OHCI_VERBOSE_DEBUG
 596         if (*(u16*)(buf+2))     /* only if wPortChange is interesting */
 597 #endif
 598                 dbg_port (ohci, "GetStatus", wIndex, temp);
 599                 break;
 600         case SetHubFeature:
 601                 switch (wValue) {
 602                 case C_HUB_OVER_CURRENT:
 603                         // FIXME:  this can be cleared, yes?
 604                 case C_HUB_LOCAL_POWER:
 605                         break;
 606                 default:
 607                         goto error;
 608                 }
 609                 break;
 610         case SetPortFeature:
 611                 if (!wIndex || wIndex > ports)
 612                         goto error;
 613                 wIndex--;
 614                 switch (wValue) {
 615                 case USB_PORT_FEAT_SUSPEND:
 616 #ifdef  CONFIG_USB_OTG
 617                         if (hcd->self.otg_port == (wIndex + 1)
 618                                         && hcd->self.b_hnp_enable)
 619                                 start_hnp(ohci);
 620                         else
 621 #endif
 622                         ohci_writel (ohci, RH_PS_PSS,
 623                                 &ohci->regs->roothub.portstatus [wIndex]);
 624                         break;
 625                 case USB_PORT_FEAT_POWER:
 626                         ohci_writel (ohci, RH_PS_PPS,
 627                                 &ohci->regs->roothub.portstatus [wIndex]);
 628                         break;
 629                 case USB_PORT_FEAT_RESET:
 630                         root_port_reset (ohci, wIndex);
 631                         break;
 632                 default:
 633                         goto error;
 634                 }
 635                 break;
 636
 637         default:
 638 error:
 639                 /* "protocol stall" on error */
 640                 retval = -EPIPE;
 641         }
 642         return retval;
 643 }
 644