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