drivers/usb/host/ohci-hub.c

   1 /*
   2  * OHCI HCD (Host Controller Driver) for USB.
   3  *
   4  * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
   5  * (C) Copyright 2000-2004 David Brownell <dbrownell@users.sourceforge.net>
   6  *
   7  * This file is licenced under GPL
   8  */
   9
  10 /*-------------------------------------------------------------------------*/
  11
  12 /*
  13  * OHCI Root Hub ... the nonsharable stuff
  14  */
  15
  16 #define dbg_port(hc,label,num,value) \
  17         ohci_dbg (hc, \
  18                 "%s roothub.portstatus [%d] " \
  19                 "= 0x%08x%s%s%s%s%s%s%s%s%s%s%s%s\n", \
  20                 label, num, temp, \
  21                 (temp & RH_PS_PRSC) ? " PRSC" : "", \
  22                 (temp & RH_PS_OCIC) ? " OCIC" : "", \
  23                 (temp & RH_PS_PSSC) ? " PSSC" : "", \
  24                 (temp & RH_PS_PESC) ? " PESC" : "", \
  25                 (temp & RH_PS_CSC) ? " CSC" : "", \
  26                 \
  27                 (temp & RH_PS_LSDA) ? " LSDA" : "", \
  28                 (temp & RH_PS_PPS) ? " PPS" : "", \
  29                 (temp & RH_PS_PRS) ? " PRS" : "", \
  30                 (temp & RH_PS_POCI) ? " POCI" : "", \
  31                 (temp & RH_PS_PSS) ? " PSS" : "", \
  32                 \
  33                 (temp & RH_PS_PES) ? " PES" : "", \
  34                 (temp & RH_PS_CCS) ? " CCS" : "" \
  35                 );
  36
  37 /*-------------------------------------------------------------------------*/
  38
  39 /* hcd->hub_irq_enable() */
  40 static void ohci_rhsc_enable (struct usb_hcd *hcd)
  41 {
  42         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
  43
  44         ohci_writel (ohci, OHCI_INTR_RHSC, &ohci->regs->intrenable);
  45 }
  46
  47 #ifdef  CONFIG_PM
  48
  49 #define OHCI_SCHED_ENABLES \
  50         (OHCI_CTRL_CLE|OHCI_CTRL_BLE|OHCI_CTRL_PLE|OHCI_CTRL_IE)
  51
  52 static void dl_done_list (struct ohci_hcd *, struct pt_regs *);
  53 static void finish_unlinks (struct ohci_hcd *, u16 , struct pt_regs *);
  54 static int ohci_restart (struct ohci_hcd *ohci);
  55
  56 static int ohci_bus_suspend (struct usb_hcd *hcd)
  57 {
  58         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
  59         int                     status = 0;
  60         unsigned long           flags;
  61
  62         spin_lock_irqsave (&ohci->lock, flags);
  63
  64         if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))) {
  65                 spin_unlock_irqrestore (&ohci->lock, flags);
  66                 return -ESHUTDOWN;
  67         }
  68
  69         ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
  70         switch (ohci->hc_control & OHCI_CTRL_HCFS) {
  71         case OHCI_USB_RESUME:
  72                 ohci_dbg (ohci, "resume/suspend?\n");
  73                 ohci->hc_control &= ~OHCI_CTRL_HCFS;
  74                 ohci->hc_control |= OHCI_USB_RESET;
  75                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
  76                 (void) ohci_readl (ohci, &ohci->regs->control);
  77                 /* FALL THROUGH */
  78         case OHCI_USB_RESET:
  79                 status = -EBUSY;
  80                 ohci_dbg (ohci, "needs reinit!\n");
  81                 goto done;
  82         case OHCI_USB_SUSPEND:
  83                 ohci_dbg (ohci, "already suspended\n");
  84                 goto done;
  85         }
  86         ohci_dbg (ohci, "suspend root hub\n");
  87
  88         /* First stop any processing */
  89         if (ohci->hc_control & OHCI_SCHED_ENABLES) {
  90                 int             limit;
  91
  92                 ohci->hc_control &= ~OHCI_SCHED_ENABLES;
  93                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
  94                 ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
  95                 ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrstatus);
  96
  97                 /* sched disables take effect on the next frame,
  98                  * then the last WDH could take 6+ msec
  99                  */
 100                 ohci_dbg (ohci, "stopping schedules ...\n");
 101                 limit = 2000;
 102                 while (limit > 0) {
 103                         udelay (250);
 104                         limit =- 250;
 105                         if (ohci_readl (ohci, &ohci->regs->intrstatus)
 106                                         & OHCI_INTR_SF)
 107                                 break;
 108                 }
 109                 dl_done_list (ohci, NULL);
 110                 mdelay (7);
 111         }
 112         dl_done_list (ohci, NULL);
 113         finish_unlinks (ohci, ohci_frame_no(ohci), NULL);
 114         ohci_writel (ohci, ohci_readl (ohci, &ohci->regs->intrstatus),
 115                         &ohci->regs->intrstatus);
 116
 117         /* maybe resume can wake root hub */
 118         if (device_may_wakeup(&ohci_to_hcd(ohci)->self.root_hub->dev))
 119                 ohci->hc_control |= OHCI_CTRL_RWE;
 120         else
 121                 ohci->hc_control &= ~OHCI_CTRL_RWE;
 122
 123         /* Suspend hub ... this is the "global (to this bus) suspend" mode,
 124          * which doesn't imply ports will first be individually suspended.
 125          */
 126         ohci->hc_control &= ~OHCI_CTRL_HCFS;
 127         ohci->hc_control |= OHCI_USB_SUSPEND;
 128         ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 129         (void) ohci_readl (ohci, &ohci->regs->control);
 130
 131         /* no resumes until devices finish suspending */
 132         ohci->next_statechange = jiffies + msecs_to_jiffies (5);
 133
 134         /* no timer polling */
 135         hcd->poll_rh = 0;
 136
 137 done:
 138         /* external suspend vs self autosuspend ... same effect */
 139         if (status == 0)
 140                 usb_hcd_suspend_root_hub(hcd);
 141         spin_unlock_irqrestore (&ohci->lock, flags);
 142         return status;
 143 }
 144
 145 static inline struct ed *find_head (struct ed *ed)
 146 {
 147         /* for bulk and control lists */
 148         while (ed->ed_prev)
 149                 ed = ed->ed_prev;
 150         return ed;
 151 }
 152
 153 /* caller has locked the root hub */
 154 static int ohci_bus_resume (struct usb_hcd *hcd)
 155 {
 156         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
 157         u32                     temp, enables;
 158         int                     status = -EINPROGRESS;
 159         unsigned long           flags;
 160
 161         if (time_before (jiffies, ohci->next_statechange))
 162                 msleep(5);
 163
 164         spin_lock_irqsave (&ohci->lock, flags);
 165
 166         if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))) {
 167                 spin_unlock_irqrestore (&ohci->lock, flags);
 168                 return -ESHUTDOWN;
 169         }
 170
 171
 172         ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
 173
 174         if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) {
 175                 /* this can happen after resuming a swsusp snapshot */
 176                 if (hcd->state == HC_STATE_RESUMING) {
 177                         ohci_dbg (ohci, "BIOS/SMM active, control %03x\n",
 178                                         ohci->hc_control);
 179                         status = -EBUSY;
 180                 /* this happens when pmcore resumes HC then root */
 181                 } else {
 182                         ohci_dbg (ohci, "duplicate resume\n");
 183                         status = 0;
 184                 }
 185         } else switch (ohci->hc_control & OHCI_CTRL_HCFS) {
 186         case OHCI_USB_SUSPEND:
 187                 ohci->hc_control &= ~(OHCI_CTRL_HCFS|OHCI_SCHED_ENABLES);
 188                 ohci->hc_control |= OHCI_USB_RESUME;
 189                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 190                 (void) ohci_readl (ohci, &ohci->regs->control);
 191                 ohci_dbg (ohci, "resume root hub\n");
 192                 break;
 193         case OHCI_USB_RESUME:
 194                 /* HCFS changes sometime after INTR_RD */
 195                 ohci_info (ohci, "wakeup\n");
 196                 break;
 197         case OHCI_USB_OPER:
 198                 /* this can happen after resuming a swsusp snapshot */
 199                 ohci_dbg (ohci, "snapshot resume? reinit\n");
 200                 status = -EBUSY;
 201                 break;
 202         default:                /* RESET, we lost power */
 203                 ohci_dbg (ohci, "lost power\n");
 204                 status = -EBUSY;
 205         }
 206         spin_unlock_irqrestore (&ohci->lock, flags);
 207         if (status == -EBUSY) {
 208                 (void) ohci_init (ohci);
 209                 return ohci_restart (ohci);
 210         }
 211         if (status != -EINPROGRESS)
 212                 return status;
 213
 214         temp = ohci->num_ports;
 215         enables = 0;
 216         while (temp--) {
 217                 u32 stat = ohci_readl (ohci,
 218                                        &ohci->regs->roothub.portstatus [temp]);
 219
 220                 /* force global, not selective, resume */
 221                 if (!(stat & RH_PS_PSS))
 222                         continue;
 223                 ohci_writel (ohci, RH_PS_POCI,
 224                                 &ohci->regs->roothub.portstatus [temp]);
 225         }
 226
 227         /* Some controllers (lucent erratum) need extra-long delays */
 228         msleep (20 /* usb 11.5.1.10 */ + 12 /* 32 msec counter */ + 1);
 229
 230         temp = ohci_readl (ohci, &ohci->regs->control);
 231         temp &= OHCI_CTRL_HCFS;
 232         if (temp != OHCI_USB_RESUME) {
 233                 ohci_err (ohci, "controller won't resume\n");
 234                 return -EBUSY;
 235         }
 236
 237         /* disable old schedule state, reinit from scratch */
 238         ohci_writel (ohci, 0, &ohci->regs->ed_controlhead);
 239         ohci_writel (ohci, 0, &ohci->regs->ed_controlcurrent);
 240         ohci_writel (ohci, 0, &ohci->regs->ed_bulkhead);
 241         ohci_writel (ohci, 0, &ohci->regs->ed_bulkcurrent);
 242         ohci_writel (ohci, 0, &ohci->regs->ed_periodcurrent);
 243         ohci_writel (ohci, (u32) ohci->hcca_dma, &ohci->regs->hcca);
 244
 245         /* Sometimes PCI D3 suspend trashes frame timings ... */
 246         periodic_reinit (ohci);
 247
 248         /* interrupts might have been disabled */
 249         ohci_writel (ohci, OHCI_INTR_INIT, &ohci->regs->intrenable);
 250         if (ohci->ed_rm_list)
 251                 ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrenable);
 252         ohci_writel (ohci, ohci_readl (ohci, &ohci->regs->intrstatus),
 253                         &ohci->regs->intrstatus);
 254
 255         /* Then re-enable operations */
 256         ohci_writel (ohci, OHCI_USB_OPER, &ohci->regs->control);
 257         (void) ohci_readl (ohci, &ohci->regs->control);
 258         msleep (3);
 259
 260         temp = ohci->hc_control;
 261         temp &= OHCI_CTRL_RWC;
 262         temp |= OHCI_CONTROL_INIT | OHCI_USB_OPER;
 263         ohci->hc_control = temp;
 264         ohci_writel (ohci, temp, &ohci->regs->control);
 265         (void) ohci_readl (ohci, &ohci->regs->control);
 266
 267         /* TRSMRCY */
 268         msleep (10);
 269
 270         /* keep it alive for more than ~5x suspend + resume costs */
 271         ohci->next_statechange = jiffies + STATECHANGE_DELAY;
 272
 273         /* maybe turn schedules back on */
 274         enables = 0;
 275         temp = 0;
 276         if (!ohci->ed_rm_list) {
 277                 if (ohci->ed_controltail) {
 278                         ohci_writel (ohci,
 279                                         find_head (ohci->ed_controltail)->dma,
 280                                         &ohci->regs->ed_controlhead);
 281                         enables |= OHCI_CTRL_CLE;
 282                         temp |= OHCI_CLF;
 283                 }
 284                 if (ohci->ed_bulktail) {
 285                         ohci_writel (ohci, find_head (ohci->ed_bulktail)->dma,
 286                                 &ohci->regs->ed_bulkhead);
 287                         enables |= OHCI_CTRL_BLE;
 288                         temp |= OHCI_BLF;
 289                 }
 290         }
 291         if (hcd->self.bandwidth_isoc_reqs || hcd->self.bandwidth_int_reqs)
 292                 enables |= OHCI_CTRL_PLE|OHCI_CTRL_IE;
 293         if (enables) {
 294                 ohci_dbg (ohci, "restarting schedules ... %08x\n", enables);
 295                 ohci->hc_control |= enables;
 296                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 297                 if (temp)
 298                         ohci_writel (ohci, temp, &ohci->regs->cmdstatus);
 299                 (void) ohci_readl (ohci, &ohci->regs->control);
 300         }
 301
 302         return 0;
 303 }
 304
 305 #endif  /* CONFIG_PM */
 306
 307 /*-------------------------------------------------------------------------*/
 308
 309 /* build "status change" packet (one or two bytes) from HC registers */
 310
 311 static int
 312 ohci_hub_status_data (struct usb_hcd *hcd, char *buf)
 313 {
 314         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 315         int             i, changed = 0, length = 1;
 316         int             can_suspend;
 317         unsigned long   flags;
 318
 319         can_suspend = device_may_wakeup(&hcd->self.root_hub->dev);
 320         spin_lock_irqsave (&ohci->lock, flags);
 321
 322         /* handle autosuspended root:  finish resuming before
 323          * letting khubd or root hub timer see state changes.
 324          */
 325         if (unlikely((ohci->hc_control & OHCI_CTRL_HCFS) != OHCI_USB_OPER
 326                      || !HC_IS_RUNNING(hcd->state))) {
 327                 can_suspend = 0;
 328                 goto done;
 329         }
 330
 331         /* undocumented erratum seen on at least rev D */
 332         if ((ohci->flags & OHCI_QUIRK_AMD756)
 333                         && (roothub_a (ohci) & RH_A_NDP) > MAX_ROOT_PORTS) {
 334                 ohci_warn (ohci, "bogus NDP, rereads as NDP=%d\n",
 335                           ohci_readl (ohci, &ohci->regs->roothub.a) & RH_A_NDP);
 336                 /* retry later; "should not happen" */
 337                 goto done;
 338         }
 339
 340         /* init status */
 341         if (roothub_status (ohci) & (RH_HS_LPSC | RH_HS_OCIC))
 342                 buf [0] = changed = 1;
 343         else
 344                 buf [0] = 0;
 345         if (ohci->num_ports > 7) {
 346                 buf [1] = 0;
 347                 length++;
 348         }
 349
 350         /* look at each port */
 351         for (i = 0; i < ohci->num_ports; i++) {
 352                 u32     status = roothub_portstatus (ohci, i);
 353
 354                 /* can't autosuspend with active ports */
 355                 if ((status & RH_PS_PES) && !(status & RH_PS_PSS))
 356                         can_suspend = 0;
 357
 358                 if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC
 359                                 | RH_PS_OCIC | RH_PS_PRSC)) {
 360                         changed = 1;
 361                         if (i < 7)
 362                             buf [0] |= 1 << (i + 1);
 363                         else
 364                             buf [1] |= 1 << (i - 7);
 365                         continue;
 366                 }
 367         }
 368
 369         /* after root hub changes, stop polling after debouncing
 370          * for a while and maybe kicking in autosuspend
 371          */
 372         if (changed) {
 373                 ohci->next_statechange = jiffies + STATECHANGE_DELAY;
 374                 can_suspend = 0;
 375         } else if (time_before (jiffies, ohci->next_statechange)) {
 376                 can_suspend = 0;
 377         } else {
 378 #ifdef  CONFIG_PM
 379                 can_suspend = can_suspend
 380                         && !ohci->ed_rm_list
 381                         && ((OHCI_CTRL_HCFS | OHCI_SCHED_ENABLES)
 382                                         & ohci->hc_control)
 383                                 == OHCI_USB_OPER;
 384 #endif
 385                 if (hcd->uses_new_polling) {
 386                         hcd->poll_rh = 0;
 387                         /* use INTR_RHSC iff INTR_RD won't apply */
 388                         if (!can_suspend)
 389                                 ohci_writel (ohci, OHCI_INTR_RHSC,
 390                                                 &ohci->regs->intrenable);
 391                 }
 392         }
 393
 394 done:
 395         spin_unlock_irqrestore (&ohci->lock, flags);
 396
 397 #ifdef  CONFIG_PM
 398         /* save power by autosuspending idle root hubs;
 399          * INTR_RD wakes us when there's work
 400          */
 401         if (can_suspend && usb_trylock_device (hcd->self.root_hub) == 0) {
 402                 ohci_vdbg (ohci, "autosuspend\n");
 403                 (void) ohci_bus_suspend (hcd);
 404                 usb_unlock_device (hcd->self.root_hub);
 405         }
 406 #endif
 407
 408         return changed ? length : 0;
 409 }
 410
 411 /*-------------------------------------------------------------------------*/
 412
 413 static void
 414 ohci_hub_descriptor (
 415         struct ohci_hcd                 *ohci,
 416         struct usb_hub_descriptor       *desc
 417 ) {
 418         u32             rh = roothub_a (ohci);
 419         u16             temp;
 420
 421         desc->bDescriptorType = 0x29;
 422         desc->bPwrOn2PwrGood = (rh & RH_A_POTPGT) >> 24;
 423         desc->bHubContrCurrent = 0;
 424
 425         desc->bNbrPorts = ohci->num_ports;
 426         temp = 1 + (ohci->num_ports / 8);
 427         desc->bDescLength = 7 + 2 * temp;
 428
 429         temp = 0;
 430         if (rh & RH_A_NPS)              /* no power switching? */
 431             temp |= 0x0002;
 432         if (rh & RH_A_PSM)              /* per-port power switching? */
 433             temp |= 0x0001;
 434         if (rh & RH_A_NOCP)             /* no overcurrent reporting? */
 435             temp |= 0x0010;
 436         else if (rh & RH_A_OCPM)        /* per-port overcurrent reporting? */
 437             temp |= 0x0008;
 438         desc->wHubCharacteristics = (__force __u16)cpu_to_hc16(ohci, temp);
 439
 440         /* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
 441         rh = roothub_b (ohci);
 442         memset(desc->bitmap, 0xff, sizeof(desc->bitmap));
 443         desc->bitmap [0] = rh & RH_B_DR;
 444         if (ohci->num_ports > 7) {
 445                 desc->bitmap [1] = (rh & RH_B_DR) >> 8;
 446                 desc->bitmap [2] = 0xff;
 447         } else
 448                 desc->bitmap [1] = 0xff;
 449 }
 450
 451 /*-------------------------------------------------------------------------*/
 452
 453 #ifdef  CONFIG_USB_OTG
 454
 455 static int ohci_start_port_reset (struct usb_hcd *hcd, unsigned port)
 456 {
 457         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 458         u32                     status;
 459
 460         if (!port)
 461                 return -EINVAL;
 462         port--;
 463
 464         /* start port reset before HNP protocol times out */
 465         status = ohci_readl(ohci, &ohci->regs->roothub.portstatus [port]);
 466         if (!(status & RH_PS_CCS))
 467                 return -ENODEV;
 468
 469         /* khubd will finish the reset later */
 470         ohci_writel(ohci, RH_PS_PRS, &ohci->regs->roothub.portstatus [port]);
 471         return 0;
 472 }
 473
 474 static void start_hnp(struct ohci_hcd *ohci);
 475
 476 #else
 477
 478 #define ohci_start_port_reset           NULL
 479
 480 #endif
 481
 482 /*-------------------------------------------------------------------------*/
 483
 484
 485 /* See usb 7.1.7.5:  root hubs must issue at least 50 msec reset signaling,
 486  * not necessarily continuous ... to guard against resume signaling.
 487  * The short timeout is safe for non-root hubs, and is backward-compatible
 488  * with earlier Linux hosts.
 489  */
 490 #ifdef  CONFIG_USB_SUSPEND
 491 #define PORT_RESET_MSEC         50
 492 #else
 493 #define PORT_RESET_MSEC         10
 494 #endif
 495
 496 /* this timer value might be vendor-specific ... */
 497 #define PORT_RESET_HW_MSEC      10
 498
 499 /* wrap-aware logic morphed from <linux/jiffies.h> */
 500 #define tick_before(t1,t2) ((s16)(((s16)(t1))-((s16)(t2))) < 0)
 501
 502 /* called from some task, normally khubd */
 503 static inline void root_port_reset (struct ohci_hcd *ohci, unsigned port)
 504 {
 505         __hc32 __iomem *portstat = &ohci->regs->roothub.portstatus [port];
 506         u32     temp;
 507         u16     now = ohci_readl(ohci, &ohci->regs->fmnumber);
 508         u16     reset_done = now + PORT_RESET_MSEC;
 509
 510         /* build a "continuous enough" reset signal, with up to
 511          * 3msec gap between pulses.  scheduler HZ==100 must work;
 512          * this might need to be deadline-scheduled.
 513          */
 514         do {
 515                 /* spin until any current reset finishes */
 516                 for (;;) {
 517                         temp = ohci_readl (ohci, portstat);
 518                         if (!(temp & RH_PS_PRS))
 519                                 break;
 520                         udelay (500);
 521                 }
 522
 523                 if (!(temp & RH_PS_CCS))
 524                         break;
 525                 if (temp & RH_PS_PRSC)
 526                         ohci_writel (ohci, RH_PS_PRSC, portstat);
 527
 528                 /* start the next reset, sleep till it's probably done */
 529                 ohci_writel (ohci, RH_PS_PRS, portstat);
 530                 msleep(PORT_RESET_HW_MSEC);
 531                 now = ohci_readl(ohci, &ohci->regs->fmnumber);
 532         } while (tick_before(now, reset_done));
 533         /* caller synchronizes using PRSC */
 534 }
 535
 536 static int ohci_hub_control (
 537         struct usb_hcd  *hcd,
 538         u16             typeReq,
 539         u16             wValue,
 540         u16             wIndex,
 541         char            *buf,
 542         u16             wLength
 543 ) {
 544         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 545         int             ports = hcd_to_bus (hcd)->root_hub->maxchild;
 546         u32             temp;
 547         int             retval = 0;
 548
 549         if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
 550                 return -ESHUTDOWN;
 551
 552         switch (typeReq) {
 553         case ClearHubFeature:
 554                 switch (wValue) {
 555                 case C_HUB_OVER_CURRENT:
 556                         ohci_writel (ohci, RH_HS_OCIC,
 557                                         &ohci->regs->roothub.status);
 558                 case C_HUB_LOCAL_POWER:
 559                         break;
 560                 default:
 561                         goto error;
 562                 }
 563                 break;
 564         case ClearPortFeature:
 565                 if (!wIndex || wIndex > ports)
 566                         goto error;
 567                 wIndex--;
 568
 569                 switch (wValue) {
 570                 case USB_PORT_FEAT_ENABLE:
 571                         temp = RH_PS_CCS;
 572                         break;
 573                 case USB_PORT_FEAT_C_ENABLE:
 574                         temp = RH_PS_PESC;
 575                         break;
 576                 case USB_PORT_FEAT_SUSPEND:
 577                         temp = RH_PS_POCI;
 578                         if ((ohci->hc_control & OHCI_CTRL_HCFS)
 579                                         != OHCI_USB_OPER)
 580                                 usb_hcd_resume_root_hub(hcd);
 581                         break;
 582                 case USB_PORT_FEAT_C_SUSPEND:
 583                         temp = RH_PS_PSSC;
 584                         break;
 585                 case USB_PORT_FEAT_POWER:
 586                         temp = RH_PS_LSDA;
 587                         break;
 588                 case USB_PORT_FEAT_C_CONNECTION:
 589                         temp = RH_PS_CSC;
 590                         break;
 591                 case USB_PORT_FEAT_C_OVER_CURRENT:
 592                         temp = RH_PS_OCIC;
 593                         break;
 594                 case USB_PORT_FEAT_C_RESET:
 595                         temp = RH_PS_PRSC;
 596                         break;
 597                 default:
 598                         goto error;
 599                 }
 600                 ohci_writel (ohci, temp,
 601                                 &ohci->regs->roothub.portstatus [wIndex]);
 602                 // ohci_readl (ohci, &ohci->regs->roothub.portstatus [wIndex]);
 603                 break;
 604         case GetHubDescriptor:
 605                 ohci_hub_descriptor (ohci, (struct usb_hub_descriptor *) buf);
 606                 break;
 607         case GetHubStatus:
 608                 temp = roothub_status (ohci) & ~(RH_HS_CRWE | RH_HS_DRWE);
 609                 put_unaligned(cpu_to_le32 (temp), (__le32 *) buf);
 610                 break;
 611         case GetPortStatus:
 612                 if (!wIndex || wIndex > ports)
 613                         goto error;
 614                 wIndex--;
 615                 temp = roothub_portstatus (ohci, wIndex);
 616                 put_unaligned(cpu_to_le32 (temp), (__le32 *) buf);
 617
 618 #ifndef OHCI_VERBOSE_DEBUG
 619         if (*(u16*)(buf+2))     /* only if wPortChange is interesting */
 620 #endif
 621                 dbg_port (ohci, "GetStatus", wIndex, temp);
 622                 break;
 623         case SetHubFeature:
 624                 switch (wValue) {
 625                 case C_HUB_OVER_CURRENT:
 626                         // FIXME:  this can be cleared, yes?
 627                 case C_HUB_LOCAL_POWER:
 628                         break;
 629                 default:
 630                         goto error;
 631                 }
 632                 break;
 633         case SetPortFeature:
 634                 if (!wIndex || wIndex > ports)
 635                         goto error;
 636                 wIndex--;
 637                 switch (wValue) {
 638                 case USB_PORT_FEAT_SUSPEND:
 639 #ifdef  CONFIG_USB_OTG
 640                         if (hcd->self.otg_port == (wIndex + 1)
 641                                         && hcd->self.b_hnp_enable)
 642                                 start_hnp(ohci);
 643                         else
 644 #endif
 645                         ohci_writel (ohci, RH_PS_PSS,
 646                                 &ohci->regs->roothub.portstatus [wIndex]);
 647                         break;
 648                 case USB_PORT_FEAT_POWER:
 649                         ohci_writel (ohci, RH_PS_PPS,
 650                                 &ohci->regs->roothub.portstatus [wIndex]);
 651                         break;
 652                 case USB_PORT_FEAT_RESET:
 653                         root_port_reset (ohci, wIndex);
 654                         break;
 655                 default:
 656                         goto error;
 657                 }
 658                 break;
 659
 660         default:
 661 error:
 662                 /* "protocol stall" on error */
 663                 retval = -EPIPE;
 664         }
 665         return retval;
 666 }
 667