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 #ifdef  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_bus_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         if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))) {
  57                 spin_unlock_irqrestore (&ohci->lock, flags);
  58                 return -ESHUTDOWN;
  59         }
  60
  61         ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
  62         switch (ohci->hc_control & OHCI_CTRL_HCFS) {
  63         case OHCI_USB_RESUME:
  64                 ohci_dbg (ohci, "resume/suspend?\n");
  65                 ohci->hc_control &= ~OHCI_CTRL_HCFS;
  66                 ohci->hc_control |= OHCI_USB_RESET;
  67                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
  68                 (void) ohci_readl (ohci, &ohci->regs->control);
  69                 /* FALL THROUGH */
  70         case OHCI_USB_RESET:
  71                 status = -EBUSY;
  72                 ohci_dbg (ohci, "needs reinit!\n");
  73                 goto done;
  74         case OHCI_USB_SUSPEND:
  75                 ohci_dbg (ohci, "already suspended\n");
  76                 goto done;
  77         }
  78         ohci_dbg (ohci, "suspend root hub\n");
  79
  80         /* First stop any processing */
  81         if (ohci->hc_control & OHCI_SCHED_ENABLES) {
  82                 int             limit;
  83
  84                 ohci->hc_control &= ~OHCI_SCHED_ENABLES;
  85                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
  86                 ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
  87                 ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrstatus);
  88
  89                 /* sched disables take effect on the next frame,
  90                  * then the last WDH could take 6+ msec
  91                  */
  92                 ohci_dbg (ohci, "stopping schedules ...\n");
  93                 limit = 2000;
  94                 while (limit > 0) {
  95                         udelay (250);
  96                         limit =- 250;
  97                         if (ohci_readl (ohci, &ohci->regs->intrstatus)
  98                                         & OHCI_INTR_SF)
  99                                 break;
 100                 }
 101                 dl_done_list (ohci, NULL);
 102                 mdelay (7);
 103         }
 104         dl_done_list (ohci, NULL);
 105         finish_unlinks (ohci, ohci_frame_no(ohci), NULL);
 106         ohci_writel (ohci, ohci_readl (ohci, &ohci->regs->intrstatus),
 107                         &ohci->regs->intrstatus);
 108
 109         /* maybe resume can wake root hub */
 110         if (device_may_wakeup(&ohci_to_hcd(ohci)->self.root_hub->dev))
 111                 ohci->hc_control |= OHCI_CTRL_RWE;
 112         else
 113                 ohci->hc_control &= ~OHCI_CTRL_RWE;
 114
 115         /* Suspend hub ... this is the "global (to this bus) suspend" mode,
 116          * which doesn't imply ports will first be individually suspended.
 117          */
 118         ohci->hc_control &= ~OHCI_CTRL_HCFS;
 119         ohci->hc_control |= OHCI_USB_SUSPEND;
 120         ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 121         (void) ohci_readl (ohci, &ohci->regs->control);
 122
 123         /* no resumes until devices finish suspending */
 124         ohci->next_statechange = jiffies + msecs_to_jiffies (5);
 125
 126 done:
 127         /* external suspend vs self autosuspend ... same effect */
 128         if (status == 0)
 129                 usb_hcd_suspend_root_hub(hcd);
 130         spin_unlock_irqrestore (&ohci->lock, flags);
 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_bus_resume (struct usb_hcd *hcd)
 144 {
 145         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
 146         u32                     temp, enables;
 147         int                     status = -EINPROGRESS;
 148         unsigned long           flags;
 149
 150         if (time_before (jiffies, ohci->next_statechange))
 151                 msleep(5);
 152
 153         spin_lock_irqsave (&ohci->lock, flags);
 154
 155         if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))) {
 156                 spin_unlock_irqrestore (&ohci->lock, flags);
 157                 return -ESHUTDOWN;
 158         }
 159
 160
 161         ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
 162
 163         if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) {
 164                 /* this can happen after resuming a swsusp snapshot */
 165                 if (hcd->state == HC_STATE_RESUMING) {
 166                         ohci_dbg (ohci, "BIOS/SMM active, control %03x\n",
 167                                         ohci->hc_control);
 168                         status = -EBUSY;
 169                 /* this happens when pmcore resumes HC then root */
 170                 } else {
 171                         ohci_dbg (ohci, "duplicate resume\n");
 172                         status = 0;
 173                 }
 174         } else switch (ohci->hc_control & OHCI_CTRL_HCFS) {
 175         case OHCI_USB_SUSPEND:
 176                 ohci->hc_control &= ~(OHCI_CTRL_HCFS|OHCI_SCHED_ENABLES);
 177                 ohci->hc_control |= OHCI_USB_RESUME;
 178                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 179                 (void) ohci_readl (ohci, &ohci->regs->control);
 180                 ohci_dbg (ohci, "resume root hub\n");
 181                 break;
 182         case OHCI_USB_RESUME:
 183                 /* HCFS changes sometime after INTR_RD */
 184                 ohci_info (ohci, "wakeup\n");
 185                 break;
 186         case OHCI_USB_OPER:
 187                 /* this can happen after resuming a swsusp snapshot */
 188                 ohci_dbg (ohci, "snapshot resume? reinit\n");
 189                 status = -EBUSY;
 190                 break;
 191         default:                /* RESET, we lost power */
 192                 ohci_dbg (ohci, "lost power\n");
 193                 status = -EBUSY;
 194         }
 195         spin_unlock_irqrestore (&ohci->lock, flags);
 196         if (status == -EBUSY) {
 197                 (void) ohci_init (ohci);
 198                 return ohci_restart (ohci);
 199         }
 200         if (status != -EINPROGRESS)
 201                 return status;
 202
 203         temp = ohci->num_ports;
 204         enables = 0;
 205         while (temp--) {
 206                 u32 stat = ohci_readl (ohci,
 207                                        &ohci->regs->roothub.portstatus [temp]);
 208
 209                 /* force global, not selective, resume */
 210                 if (!(stat & RH_PS_PSS))
 211                         continue;
 212                 ohci_writel (ohci, RH_PS_POCI,
 213                                 &ohci->regs->roothub.portstatus [temp]);
 214         }
 215
 216         /* Some controllers (lucent erratum) need extra-long delays */
 217         msleep (20 /* usb 11.5.1.10 */ + 12 /* 32 msec counter */ + 1);
 218
 219         temp = ohci_readl (ohci, &ohci->regs->control);
 220         temp &= OHCI_CTRL_HCFS;
 221         if (temp != OHCI_USB_RESUME) {
 222                 ohci_err (ohci, "controller won't resume\n");
 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         /* interrupts might have been disabled */
 238         ohci_writel (ohci, OHCI_INTR_INIT, &ohci->regs->intrenable);
 239         if (ohci->ed_rm_list)
 240                 ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrenable);
 241         ohci_writel (ohci, ohci_readl (ohci, &ohci->regs->intrstatus),
 242                         &ohci->regs->intrstatus);
 243
 244         /* Then re-enable operations */
 245         ohci_writel (ohci, OHCI_USB_OPER, &ohci->regs->control);
 246         (void) ohci_readl (ohci, &ohci->regs->control);
 247         msleep (3);
 248
 249         temp = ohci->hc_control;
 250         temp &= OHCI_CTRL_RWC;
 251         temp |= OHCI_CONTROL_INIT | OHCI_USB_OPER;
 252         ohci->hc_control = temp;
 253         ohci_writel (ohci, temp, &ohci->regs->control);
 254         (void) ohci_readl (ohci, &ohci->regs->control);
 255
 256         /* TRSMRCY */
 257         msleep (10);
 258
 259         /* keep it alive for ~5x suspend + resume costs */
 260         ohci->next_statechange = jiffies + msecs_to_jiffies (250);
 261
 262         /* maybe turn schedules back on */
 263         enables = 0;
 264         temp = 0;
 265         if (!ohci->ed_rm_list) {
 266                 if (ohci->ed_controltail) {
 267                         ohci_writel (ohci,
 268                                         find_head (ohci->ed_controltail)->dma,
 269                                         &ohci->regs->ed_controlhead);
 270                         enables |= OHCI_CTRL_CLE;
 271                         temp |= OHCI_CLF;
 272                 }
 273                 if (ohci->ed_bulktail) {
 274                         ohci_writel (ohci, find_head (ohci->ed_bulktail)->dma,
 275                                 &ohci->regs->ed_bulkhead);
 276                         enables |= OHCI_CTRL_BLE;
 277                         temp |= OHCI_BLF;
 278                 }
 279         }
 280         if (hcd->self.bandwidth_isoc_reqs || hcd->self.bandwidth_int_reqs)
 281                 enables |= OHCI_CTRL_PLE|OHCI_CTRL_IE;
 282         if (enables) {
 283                 ohci_dbg (ohci, "restarting schedules ... %08x\n", enables);
 284                 ohci->hc_control |= enables;
 285                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 286                 if (temp)
 287                         ohci_writel (ohci, temp, &ohci->regs->cmdstatus);
 288                 (void) ohci_readl (ohci, &ohci->regs->control);
 289         }
 290
 291         return 0;
 292 }
 293
 294 #endif  /* CONFIG_PM */
 295
 296 /*-------------------------------------------------------------------------*/
 297
 298 /* build "status change" packet (one or two bytes) from HC registers */
 299
 300 static int
 301 ohci_hub_status_data (struct usb_hcd *hcd, char *buf)
 302 {
 303         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 304         int             i, changed = 0, length = 1;
 305         int             can_suspend = device_may_wakeup(&hcd->self.root_hub->dev);
 306         unsigned long   flags;
 307
 308         spin_lock_irqsave (&ohci->lock, flags);
 309
 310         /* handle autosuspended root:  finish resuming before
 311          * letting khubd or root hub timer see state changes.
 312          */
 313         if (unlikely((ohci->hc_control & OHCI_CTRL_HCFS) != OHCI_USB_OPER
 314                      || !HC_IS_RUNNING(hcd->state))) {
 315                 can_suspend = 0;
 316                 goto done;
 317         }
 318
 319         /* undocumented erratum seen on at least rev D */
 320         if ((ohci->flags & OHCI_QUIRK_AMD756)
 321                         && (roothub_a (ohci) & RH_A_NDP) > MAX_ROOT_PORTS) {
 322                 ohci_warn (ohci, "bogus NDP, rereads as NDP=%d\n",
 323                           ohci_readl (ohci, &ohci->regs->roothub.a) & RH_A_NDP);
 324                 /* retry later; "should not happen" */
 325                 goto done;
 326         }
 327
 328         /* init status */
 329         if (roothub_status (ohci) & (RH_HS_LPSC | RH_HS_OCIC))
 330                 buf [0] = changed = 1;
 331         else
 332                 buf [0] = 0;
 333         if (ohci->num_ports > 7) {
 334                 buf [1] = 0;
 335                 length++;
 336         }
 337
 338         /* look at each port */
 339         for (i = 0; i < ohci->num_ports; i++) {
 340                 u32     status = roothub_portstatus (ohci, i);
 341
 342                 if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC
 343                                 | RH_PS_OCIC | RH_PS_PRSC)) {
 344                         changed = 1;
 345                         if (i < 7)
 346                             buf [0] |= 1 << (i + 1);
 347                         else
 348                             buf [1] |= 1 << (i - 7);
 349                         continue;
 350                 }
 351
 352                 /* can suspend if no ports are enabled; or if all all
 353                  * enabled ports are suspended AND remote wakeup is on.
 354                  */
 355                 if (!(status & RH_PS_CCS))
 356                         continue;
 357                 if ((status & RH_PS_PSS) && can_suspend)
 358                         continue;
 359                 can_suspend = 0;
 360         }
 361 done:
 362         spin_unlock_irqrestore (&ohci->lock, flags);
 363
 364 #ifdef CONFIG_PM
 365         /* save power by suspending idle root hubs;
 366          * INTR_RD wakes us when there's work
 367          */
 368         if (can_suspend
 369                         && !changed
 370                         && !ohci->ed_rm_list
 371                         && ((OHCI_CTRL_HCFS | OHCI_SCHED_ENABLES)
 372                                         & ohci->hc_control)
 373                                 == OHCI_USB_OPER
 374                         && time_after (jiffies, ohci->next_statechange)
 375                         && usb_trylock_device (hcd->self.root_hub) == 0
 376                         ) {
 377                 ohci_vdbg (ohci, "autosuspend\n");
 378                 (void) ohci_bus_suspend (hcd);
 379                 usb_unlock_device (hcd->self.root_hub);
 380         }
 381 #endif
 382
 383         return changed ? length : 0;
 384 }
 385
 386 /*-------------------------------------------------------------------------*/
 387
 388 static void
 389 ohci_hub_descriptor (
 390         struct ohci_hcd                 *ohci,
 391         struct usb_hub_descriptor       *desc
 392 ) {
 393         u32             rh = roothub_a (ohci);
 394         u16             temp;
 395
 396         desc->bDescriptorType = 0x29;
 397         desc->bPwrOn2PwrGood = (rh & RH_A_POTPGT) >> 24;
 398         desc->bHubContrCurrent = 0;
 399
 400         desc->bNbrPorts = ohci->num_ports;
 401         temp = 1 + (ohci->num_ports / 8);
 402         desc->bDescLength = 7 + 2 * temp;
 403
 404         temp = 0;
 405         if (rh & RH_A_NPS)              /* no power switching? */
 406             temp |= 0x0002;
 407         if (rh & RH_A_PSM)              /* per-port power switching? */
 408             temp |= 0x0001;
 409         if (rh & RH_A_NOCP)             /* no overcurrent reporting? */
 410             temp |= 0x0010;
 411         else if (rh & RH_A_OCPM)        /* per-port overcurrent reporting? */
 412             temp |= 0x0008;
 413         desc->wHubCharacteristics = (__force __u16)cpu_to_hc16(ohci, temp);
 414
 415         /* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
 416         rh = roothub_b (ohci);
 417         memset(desc->bitmap, 0xff, sizeof(desc->bitmap));
 418         desc->bitmap [0] = rh & RH_B_DR;
 419         if (ohci->num_ports > 7) {
 420                 desc->bitmap [1] = (rh & RH_B_DR) >> 8;
 421                 desc->bitmap [2] = 0xff;
 422         } else
 423                 desc->bitmap [1] = 0xff;
 424 }
 425
 426 /*-------------------------------------------------------------------------*/
 427
 428 #ifdef  CONFIG_USB_OTG
 429
 430 static int ohci_start_port_reset (struct usb_hcd *hcd, unsigned port)
 431 {
 432         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 433         u32                     status;
 434
 435         if (!port)
 436                 return -EINVAL;
 437         port--;
 438
 439         /* start port reset before HNP protocol times out */
 440         status = ohci_readl(ohci, &ohci->regs->roothub.portstatus [port]);
 441         if (!(status & RH_PS_CCS))
 442                 return -ENODEV;
 443
 444         /* khubd will finish the reset later */
 445         ohci_writel(ohci, RH_PS_PRS, &ohci->regs->roothub.portstatus [port]);
 446         return 0;
 447 }
 448
 449 static void start_hnp(struct ohci_hcd *ohci);
 450
 451 #else
 452
 453 #define ohci_start_port_reset           NULL
 454
 455 #endif
 456
 457 /*-------------------------------------------------------------------------*/
 458
 459
 460 /* See usb 7.1.7.5:  root hubs must issue at least 50 msec reset signaling,
 461  * not necessarily continuous ... to guard against resume signaling.
 462  * The short timeout is safe for non-root hubs, and is backward-compatible
 463  * with earlier Linux hosts.
 464  */
 465 #ifdef  CONFIG_USB_SUSPEND
 466 #define PORT_RESET_MSEC         50
 467 #else
 468 #define PORT_RESET_MSEC         10
 469 #endif
 470
 471 /* this timer value might be vendor-specific ... */
 472 #define PORT_RESET_HW_MSEC      10
 473
 474 /* wrap-aware logic morphed from <linux/jiffies.h> */
 475 #define tick_before(t1,t2) ((s16)(((s16)(t1))-((s16)(t2))) < 0)
 476
 477 /* called from some task, normally khubd */
 478 static inline void root_port_reset (struct ohci_hcd *ohci, unsigned port)
 479 {
 480         __hc32 __iomem *portstat = &ohci->regs->roothub.portstatus [port];
 481         u32     temp;
 482         u16     now = ohci_readl(ohci, &ohci->regs->fmnumber);
 483         u16     reset_done = now + PORT_RESET_MSEC;
 484
 485         /* build a "continuous enough" reset signal, with up to
 486          * 3msec gap between pulses.  scheduler HZ==100 must work;
 487          * this might need to be deadline-scheduled.
 488          */
 489         do {
 490                 /* spin until any current reset finishes */
 491                 for (;;) {
 492                         temp = ohci_readl (ohci, portstat);
 493                         if (!(temp & RH_PS_PRS))
 494                                 break;
 495                         udelay (500);
 496                 }
 497
 498                 if (!(temp & RH_PS_CCS))
 499                         break;
 500                 if (temp & RH_PS_PRSC)
 501                         ohci_writel (ohci, RH_PS_PRSC, portstat);
 502
 503                 /* start the next reset, sleep till it's probably done */
 504                 ohci_writel (ohci, RH_PS_PRS, portstat);
 505                 msleep(PORT_RESET_HW_MSEC);
 506                 now = ohci_readl(ohci, &ohci->regs->fmnumber);
 507         } while (tick_before(now, reset_done));
 508         /* caller synchronizes using PRSC */
 509 }
 510
 511 static int ohci_hub_control (
 512         struct usb_hcd  *hcd,
 513         u16             typeReq,
 514         u16             wValue,
 515         u16             wIndex,
 516         char            *buf,
 517         u16             wLength
 518 ) {
 519         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 520         int             ports = hcd_to_bus (hcd)->root_hub->maxchild;
 521         u32             temp;
 522         int             retval = 0;
 523
 524         if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
 525                 return -ESHUTDOWN;
 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                                 usb_hcd_resume_root_hub(hcd);
 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