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   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         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         if (ohci->hc_control & OHCI_SCHED_ENABLES) {
  77                 int             limit;
  78
  79                 ohci->hc_control &= ~OHCI_SCHED_ENABLES;
  80                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
  81                 ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
  82                 ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrstatus);
  83
  84                 /* sched disables take effect on the next frame,
  85                  * then the last WDH could take 6+ msec
  86                  */
  87                 ohci_dbg (ohci, "stopping schedules ...\n");
  88                 limit = 2000;
  89                 while (limit > 0) {
  90                         udelay (250);
  91                         limit =- 250;
  92                         if (ohci_readl (ohci, &ohci->regs->intrstatus)
  93                                         & OHCI_INTR_SF)
  94                                 break;
  95                 }
  96                 dl_done_list (ohci, NULL);
  97                 mdelay (7);
  98         }
  99         dl_done_list (ohci, NULL);
 100         finish_unlinks (ohci, ohci_frame_no(ohci), NULL);
 101         ohci_writel (ohci, ohci_readl (ohci, &ohci->regs->intrstatus),
 102                         &ohci->regs->intrstatus);
 103
 104         /* maybe resume can wake root hub */
 105         if (hcd->remote_wakeup)
 106                 ohci->hc_control |= OHCI_CTRL_RWE;
 107         else
 108                 ohci->hc_control &= ~OHCI_CTRL_RWE;
 109
 110         /* Suspend hub ... this is the "global (to this bus) suspend" mode,
 111          * which doesn't imply ports will first be individually suspended.
 112          */
 113         ohci->hc_control &= ~OHCI_CTRL_HCFS;
 114         ohci->hc_control |= OHCI_USB_SUSPEND;
 115         ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 116         (void) ohci_readl (ohci, &ohci->regs->control);
 117
 118         /* no resumes until devices finish suspending */
 119         ohci->next_statechange = jiffies + msecs_to_jiffies (5);
 120
 121 done:
 122         /* external suspend vs self autosuspend ... same effect */
 123         if (status == 0)
 124                 usb_hcd_suspend_root_hub(hcd);
 125         spin_unlock_irqrestore (&ohci->lock, flags);
 126         return status;
 127 }
 128
 129 static inline struct ed *find_head (struct ed *ed)
 130 {
 131         /* for bulk and control lists */
 132         while (ed->ed_prev)
 133                 ed = ed->ed_prev;
 134         return ed;
 135 }
 136
 137 /* caller has locked the root hub */
 138 static int ohci_bus_resume (struct usb_hcd *hcd)
 139 {
 140         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
 141         u32                     temp, enables;
 142         int                     status = -EINPROGRESS;
 143
 144         if (time_before (jiffies, ohci->next_statechange))
 145                 msleep(5);
 146
 147         spin_lock_irq (&ohci->lock);
 148         ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
 149
 150         if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) {
 151                 /* this can happen after resuming a swsusp snapshot */
 152                 if (hcd->state == HC_STATE_RESUMING) {
 153                         ohci_dbg (ohci, "BIOS/SMM active, control %03x\n",
 154                                         ohci->hc_control);
 155                         status = -EBUSY;
 156                 /* this happens when pmcore resumes HC then root */
 157                 } else {
 158                         ohci_dbg (ohci, "duplicate resume\n");
 159                         status = 0;
 160                 }
 161         } else switch (ohci->hc_control & OHCI_CTRL_HCFS) {
 162         case OHCI_USB_SUSPEND:
 163                 ohci->hc_control &= ~(OHCI_CTRL_HCFS|OHCI_SCHED_ENABLES);
 164                 ohci->hc_control |= OHCI_USB_RESUME;
 165                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 166                 (void) ohci_readl (ohci, &ohci->regs->control);
 167                 ohci_dbg (ohci, "resume root hub\n");
 168                 break;
 169         case OHCI_USB_RESUME:
 170                 /* HCFS changes sometime after INTR_RD */
 171                 ohci_info (ohci, "wakeup\n");
 172                 break;
 173         case OHCI_USB_OPER:
 174                 /* this can happen after resuming a swsusp snapshot */
 175                 ohci_dbg (ohci, "snapshot resume? reinit\n");
 176                 status = -EBUSY;
 177                 break;
 178         default:                /* RESET, we lost power */
 179                 ohci_dbg (ohci, "lost power\n");
 180                 status = -EBUSY;
 181         }
 182         spin_unlock_irq (&ohci->lock);
 183         if (status == -EBUSY) {
 184                 (void) ohci_init (ohci);
 185                 return ohci_restart (ohci);
 186         }
 187         if (status != -EINPROGRESS)
 188                 return status;
 189
 190         temp = ohci->num_ports;
 191         enables = 0;
 192         while (temp--) {
 193                 u32 stat = ohci_readl (ohci,
 194                                        &ohci->regs->roothub.portstatus [temp]);
 195
 196                 /* force global, not selective, resume */
 197                 if (!(stat & RH_PS_PSS))
 198                         continue;
 199                 ohci_writel (ohci, RH_PS_POCI,
 200                                 &ohci->regs->roothub.portstatus [temp]);
 201         }
 202
 203         /* Some controllers (lucent erratum) need extra-long delays */
 204         msleep (20 /* usb 11.5.1.10 */ + 12 /* 32 msec counter */ + 1);
 205
 206         temp = ohci_readl (ohci, &ohci->regs->control);
 207         temp &= OHCI_CTRL_HCFS;
 208         if (temp != OHCI_USB_RESUME) {
 209                 ohci_err (ohci, "controller won't resume\n");
 210                 return -EBUSY;
 211         }
 212
 213         /* disable old schedule state, reinit from scratch */
 214         ohci_writel (ohci, 0, &ohci->regs->ed_controlhead);
 215         ohci_writel (ohci, 0, &ohci->regs->ed_controlcurrent);
 216         ohci_writel (ohci, 0, &ohci->regs->ed_bulkhead);
 217         ohci_writel (ohci, 0, &ohci->regs->ed_bulkcurrent);
 218         ohci_writel (ohci, 0, &ohci->regs->ed_periodcurrent);
 219         ohci_writel (ohci, (u32) ohci->hcca_dma, &ohci->regs->hcca);
 220
 221         /* Sometimes PCI D3 suspend trashes frame timings ... */
 222         periodic_reinit (ohci);
 223
 224         /* interrupts might have been disabled */
 225         ohci_writel (ohci, OHCI_INTR_INIT, &ohci->regs->intrenable);
 226         if (ohci->ed_rm_list)
 227                 ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrenable);
 228         ohci_writel (ohci, ohci_readl (ohci, &ohci->regs->intrstatus),
 229                         &ohci->regs->intrstatus);
 230
 231         /* Then re-enable operations */
 232         ohci_writel (ohci, OHCI_USB_OPER, &ohci->regs->control);
 233         (void) ohci_readl (ohci, &ohci->regs->control);
 234         msleep (3);
 235
 236         temp = OHCI_CONTROL_INIT | OHCI_USB_OPER;
 237         if (hcd->can_wakeup)
 238                 temp |= OHCI_CTRL_RWC;
 239         ohci->hc_control = temp;
 240         ohci_writel (ohci, temp, &ohci->regs->control);
 241         (void) ohci_readl (ohci, &ohci->regs->control);
 242
 243         /* TRSMRCY */
 244         msleep (10);
 245
 246         /* keep it alive for ~5x suspend + resume costs */
 247         ohci->next_statechange = jiffies + msecs_to_jiffies (250);
 248
 249         /* maybe turn schedules back on */
 250         enables = 0;
 251         temp = 0;
 252         if (!ohci->ed_rm_list) {
 253                 if (ohci->ed_controltail) {
 254                         ohci_writel (ohci,
 255                                         find_head (ohci->ed_controltail)->dma,
 256                                         &ohci->regs->ed_controlhead);
 257                         enables |= OHCI_CTRL_CLE;
 258                         temp |= OHCI_CLF;
 259                 }
 260                 if (ohci->ed_bulktail) {
 261                         ohci_writel (ohci, find_head (ohci->ed_bulktail)->dma,
 262                                 &ohci->regs->ed_bulkhead);
 263                         enables |= OHCI_CTRL_BLE;
 264                         temp |= OHCI_BLF;
 265                 }
 266         }
 267         if (hcd->self.bandwidth_isoc_reqs || hcd->self.bandwidth_int_reqs)
 268                 enables |= OHCI_CTRL_PLE|OHCI_CTRL_IE;
 269         if (enables) {
 270                 ohci_dbg (ohci, "restarting schedules ... %08x\n", enables);
 271                 ohci->hc_control |= enables;
 272                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 273                 if (temp)
 274                         ohci_writel (ohci, temp, &ohci->regs->cmdstatus);
 275                 (void) ohci_readl (ohci, &ohci->regs->control);
 276         }
 277
 278         return 0;
 279 }
 280
 281 #endif  /* CONFIG_PM */
 282
 283 /*-------------------------------------------------------------------------*/
 284
 285 /* build "status change" packet (one or two bytes) from HC registers */
 286
 287 static int
 288 ohci_hub_status_data (struct usb_hcd *hcd, char *buf)
 289 {
 290         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 291         int             i, changed = 0, length = 1;
 292         int             can_suspend = hcd->can_wakeup;
 293         unsigned long   flags;
 294
 295         spin_lock_irqsave (&ohci->lock, flags);
 296
 297         /* handle autosuspended root:  finish resuming before
 298          * letting khubd or root hub timer see state changes.
 299          */
 300         if ((ohci->hc_control & OHCI_CTRL_HCFS) != OHCI_USB_OPER
 301                         || !HC_IS_RUNNING(hcd->state)) {
 302                 can_suspend = 0;
 303                 goto done;
 304         }
 305
 306         /* undocumented erratum seen on at least rev D */
 307         if ((ohci->flags & OHCI_QUIRK_AMD756)
 308                         && (roothub_a (ohci) & RH_A_NDP) > MAX_ROOT_PORTS) {
 309                 ohci_warn (ohci, "bogus NDP, rereads as NDP=%d\n",
 310                           ohci_readl (ohci, &ohci->regs->roothub.a) & RH_A_NDP);
 311                 /* retry later; "should not happen" */
 312                 goto done;
 313         }
 314
 315         /* init status */
 316         if (roothub_status (ohci) & (RH_HS_LPSC | RH_HS_OCIC))
 317                 buf [0] = changed = 1;
 318         else
 319                 buf [0] = 0;
 320         if (ohci->num_ports > 7) {
 321                 buf [1] = 0;
 322                 length++;
 323         }
 324
 325         /* look at each port */
 326         for (i = 0; i < ohci->num_ports; i++) {
 327                 u32     status = roothub_portstatus (ohci, i);
 328
 329                 if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC
 330                                 | RH_PS_OCIC | RH_PS_PRSC)) {
 331                         changed = 1;
 332                         if (i < 7)
 333                             buf [0] |= 1 << (i + 1);
 334                         else
 335                             buf [1] |= 1 << (i - 7);
 336                         continue;
 337                 }
 338
 339                 /* can suspend if no ports are enabled; or if all all
 340                  * enabled ports are suspended AND remote wakeup is on.
 341                  */
 342                 if (!(status & RH_PS_CCS))
 343                         continue;
 344                 if ((status & RH_PS_PSS) && hcd->remote_wakeup)
 345                         continue;
 346                 can_suspend = 0;
 347         }
 348 done:
 349         spin_unlock_irqrestore (&ohci->lock, flags);
 350
 351 #ifdef CONFIG_PM
 352         /* save power by suspending idle root hubs;
 353          * INTR_RD wakes us when there's work
 354          */
 355         if (can_suspend
 356                         && !changed
 357                         && !ohci->ed_rm_list
 358                         && ((OHCI_CTRL_HCFS | OHCI_SCHED_ENABLES)
 359                                         & ohci->hc_control)
 360                                 == OHCI_USB_OPER
 361                         && time_after (jiffies, ohci->next_statechange)
 362                         && usb_trylock_device (hcd->self.root_hub)
 363                         ) {
 364                 ohci_vdbg (ohci, "autosuspend\n");
 365                 (void) ohci_bus_suspend (hcd);
 366                 usb_unlock_device (hcd->self.root_hub);
 367         }
 368 #endif
 369
 370         return changed ? length : 0;
 371 }
 372
 373 /*-------------------------------------------------------------------------*/
 374
 375 static void
 376 ohci_hub_descriptor (
 377         struct ohci_hcd                 *ohci,
 378         struct usb_hub_descriptor       *desc
 379 ) {
 380         u32             rh = roothub_a (ohci);
 381         u16             temp;
 382
 383         desc->bDescriptorType = 0x29;
 384         desc->bPwrOn2PwrGood = (rh & RH_A_POTPGT) >> 24;
 385         desc->bHubContrCurrent = 0;
 386
 387         desc->bNbrPorts = ohci->num_ports;
 388         temp = 1 + (ohci->num_ports / 8);
 389         desc->bDescLength = 7 + 2 * temp;
 390
 391         temp = 0;
 392         if (rh & RH_A_NPS)              /* no power switching? */
 393             temp |= 0x0002;
 394         if (rh & RH_A_PSM)              /* per-port power switching? */
 395             temp |= 0x0001;
 396         if (rh & RH_A_NOCP)             /* no overcurrent reporting? */
 397             temp |= 0x0010;
 398         else if (rh & RH_A_OCPM)        /* per-port overcurrent reporting? */
 399             temp |= 0x0008;
 400         desc->wHubCharacteristics = (__force __u16)cpu_to_hc16(ohci, temp);
 401
 402         /* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
 403         rh = roothub_b (ohci);
 404         memset(desc->bitmap, 0xff, sizeof(desc->bitmap));
 405         desc->bitmap [0] = rh & RH_B_DR;
 406         if (ohci->num_ports > 7) {
 407                 desc->bitmap [1] = (rh & RH_B_DR) >> 8;
 408                 desc->bitmap [2] = 0xff;
 409         } else
 410                 desc->bitmap [1] = 0xff;
 411 }
 412
 413 /*-------------------------------------------------------------------------*/
 414
 415 #ifdef  CONFIG_USB_OTG
 416
 417 static int ohci_start_port_reset (struct usb_hcd *hcd, unsigned port)
 418 {
 419         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 420         u32                     status;
 421
 422         if (!port)
 423                 return -EINVAL;
 424         port--;
 425
 426         /* start port reset before HNP protocol times out */
 427         status = ohci_readl(ohci, &ohci->regs->roothub.portstatus [port]);
 428         if (!(status & RH_PS_CCS))
 429                 return -ENODEV;
 430
 431         /* khubd will finish the reset later */
 432         ohci_writel(ohci, RH_PS_PRS, &ohci->regs->roothub.portstatus [port]);
 433         return 0;
 434 }
 435
 436 static void start_hnp(struct ohci_hcd *ohci);
 437
 438 #else
 439
 440 #define ohci_start_port_reset           NULL
 441
 442 #endif
 443
 444 /*-------------------------------------------------------------------------*/
 445
 446
 447 /* See usb 7.1.7.5:  root hubs must issue at least 50 msec reset signaling,
 448  * not necessarily continuous ... to guard against resume signaling.
 449  * The short timeout is safe for non-root hubs, and is backward-compatible
 450  * with earlier Linux hosts.
 451  */
 452 #ifdef  CONFIG_USB_SUSPEND
 453 #define PORT_RESET_MSEC         50
 454 #else
 455 #define PORT_RESET_MSEC         10
 456 #endif
 457
 458 /* this timer value might be vendor-specific ... */
 459 #define PORT_RESET_HW_MSEC      10
 460
 461 /* wrap-aware logic morphed from <linux/jiffies.h> */
 462 #define tick_before(t1,t2) ((s16)(((s16)(t1))-((s16)(t2))) < 0)
 463
 464 /* called from some task, normally khubd */
 465 static inline void root_port_reset (struct ohci_hcd *ohci, unsigned port)
 466 {
 467         __hc32 __iomem *portstat = &ohci->regs->roothub.portstatus [port];
 468         u32     temp;
 469         u16     now = ohci_readl(ohci, &ohci->regs->fmnumber);
 470         u16     reset_done = now + PORT_RESET_MSEC;
 471
 472         /* build a "continuous enough" reset signal, with up to
 473          * 3msec gap between pulses.  scheduler HZ==100 must work;
 474          * this might need to be deadline-scheduled.
 475          */
 476         do {
 477                 /* spin until any current reset finishes */
 478                 for (;;) {
 479                         temp = ohci_readl (ohci, portstat);
 480                         if (!(temp & RH_PS_PRS))
 481                                 break;
 482                         udelay (500);
 483                 }
 484
 485                 if (!(temp & RH_PS_CCS))
 486                         break;
 487                 if (temp & RH_PS_PRSC)
 488                         ohci_writel (ohci, RH_PS_PRSC, portstat);
 489
 490                 /* start the next reset, sleep till it's probably done */
 491                 ohci_writel (ohci, RH_PS_PRS, portstat);
 492                 msleep(PORT_RESET_HW_MSEC);
 493                 now = ohci_readl(ohci, &ohci->regs->fmnumber);
 494         } while (tick_before(now, reset_done));
 495         /* caller synchronizes using PRSC */
 496 }
 497
 498 static int ohci_hub_control (
 499         struct usb_hcd  *hcd,
 500         u16             typeReq,
 501         u16             wValue,
 502         u16             wIndex,
 503         char            *buf,
 504         u16             wLength
 505 ) {
 506         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 507         int             ports = hcd_to_bus (hcd)->root_hub->maxchild;
 508         u32             temp;
 509         int             retval = 0;
 510
 511         switch (typeReq) {
 512         case ClearHubFeature:
 513                 switch (wValue) {
 514                 case C_HUB_OVER_CURRENT:
 515                         ohci_writel (ohci, RH_HS_OCIC,
 516                                         &ohci->regs->roothub.status);
 517                 case C_HUB_LOCAL_POWER:
 518                         break;
 519                 default:
 520                         goto error;
 521                 }
 522                 break;
 523         case ClearPortFeature:
 524                 if (!wIndex || wIndex > ports)
 525                         goto error;
 526                 wIndex--;
 527
 528                 switch (wValue) {
 529                 case USB_PORT_FEAT_ENABLE:
 530                         temp = RH_PS_CCS;
 531                         break;
 532                 case USB_PORT_FEAT_C_ENABLE:
 533                         temp = RH_PS_PESC;
 534                         break;
 535                 case USB_PORT_FEAT_SUSPEND:
 536                         temp = RH_PS_POCI;
 537                         if ((ohci->hc_control & OHCI_CTRL_HCFS)
 538                                         != OHCI_USB_OPER)
 539                                 usb_hcd_resume_root_hub(hcd);
 540                         break;
 541                 case USB_PORT_FEAT_C_SUSPEND:
 542                         temp = RH_PS_PSSC;
 543                         break;
 544                 case USB_PORT_FEAT_POWER:
 545                         temp = RH_PS_LSDA;
 546                         break;
 547                 case USB_PORT_FEAT_C_CONNECTION:
 548                         temp = RH_PS_CSC;
 549                         break;
 550                 case USB_PORT_FEAT_C_OVER_CURRENT:
 551                         temp = RH_PS_OCIC;
 552                         break;
 553                 case USB_PORT_FEAT_C_RESET:
 554                         temp = RH_PS_PRSC;
 555                         break;
 556                 default:
 557                         goto error;
 558                 }
 559                 ohci_writel (ohci, temp,
 560                                 &ohci->regs->roothub.portstatus [wIndex]);
 561                 // ohci_readl (ohci, &ohci->regs->roothub.portstatus [wIndex]);
 562                 break;
 563         case GetHubDescriptor:
 564                 ohci_hub_descriptor (ohci, (struct usb_hub_descriptor *) buf);
 565                 break;
 566         case GetHubStatus:
 567                 temp = roothub_status (ohci) & ~(RH_HS_CRWE | RH_HS_DRWE);
 568                 *(__le32 *) buf = cpu_to_le32 (temp);
 569                 break;
 570         case GetPortStatus:
 571                 if (!wIndex || wIndex > ports)
 572                         goto error;
 573                 wIndex--;
 574                 temp = roothub_portstatus (ohci, wIndex);
 575                 *(__le32 *) buf = cpu_to_le32 (temp);
 576
 577 #ifndef OHCI_VERBOSE_DEBUG
 578         if (*(u16*)(buf+2))     /* only if wPortChange is interesting */
 579 #endif
 580                 dbg_port (ohci, "GetStatus", wIndex, temp);
 581                 break;
 582         case SetHubFeature:
 583                 switch (wValue) {
 584                 case C_HUB_OVER_CURRENT:
 585                         // FIXME:  this can be cleared, yes?
 586                 case C_HUB_LOCAL_POWER:
 587                         break;
 588                 default:
 589                         goto error;
 590                 }
 591                 break;
 592         case SetPortFeature:
 593                 if (!wIndex || wIndex > ports)
 594                         goto error;
 595                 wIndex--;
 596                 switch (wValue) {
 597                 case USB_PORT_FEAT_SUSPEND:
 598 #ifdef  CONFIG_USB_OTG
 599                         if (hcd->self.otg_port == (wIndex + 1)
 600                                         && hcd->self.b_hnp_enable)
 601                                 start_hnp(ohci);
 602                         else
 603 #endif
 604                         ohci_writel (ohci, RH_PS_PSS,
 605                                 &ohci->regs->roothub.portstatus [wIndex]);
 606                         break;
 607                 case USB_PORT_FEAT_POWER:
 608                         ohci_writel (ohci, RH_PS_PPS,
 609                                 &ohci->regs->roothub.portstatus [wIndex]);
 610                         break;
 611                 case USB_PORT_FEAT_RESET:
 612                         root_port_reset (ohci, wIndex);
 613                         break;
 614                 default:
 615                         goto error;
 616                 }
 617                 break;
 618
 619         default:
 620 error:
 621                 /* "protocol stall" on error */
 622                 retval = -EPIPE;
 623         }
 624         return retval;
 625 }
 626