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         spin_lock_irq(&ohci->lock);
  45         if (!ohci->autostop)
  46                 del_timer(&hcd->rh_timer);      /* Prevent next poll */
  47         ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrenable);
  48         spin_unlock_irq(&ohci->lock);
  49 }
  50
  51 #define OHCI_SCHED_ENABLES \
  52         (OHCI_CTRL_CLE|OHCI_CTRL_BLE|OHCI_CTRL_PLE|OHCI_CTRL_IE)
  53
  54 static void dl_done_list (struct ohci_hcd *);
  55 static void finish_unlinks (struct ohci_hcd *, u16);
  56
  57 #ifdef  CONFIG_PM
  58 static int ohci_restart(struct ohci_hcd *ohci);
  59 #endif
  60
  61 static int ohci_rh_suspend (struct ohci_hcd *ohci, int autostop)
  62 __releases(ohci->lock)
  63 __acquires(ohci->lock)
  64 {
  65         int                     status = 0;
  66
  67         ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
  68         switch (ohci->hc_control & OHCI_CTRL_HCFS) {
  69         case OHCI_USB_RESUME:
  70                 ohci_dbg (ohci, "resume/suspend?\n");
  71                 ohci->hc_control &= ~OHCI_CTRL_HCFS;
  72                 ohci->hc_control |= OHCI_USB_RESET;
  73                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
  74                 (void) ohci_readl (ohci, &ohci->regs->control);
  75                 /* FALL THROUGH */
  76         case OHCI_USB_RESET:
  77                 status = -EBUSY;
  78                 ohci_dbg (ohci, "needs reinit!\n");
  79                 goto done;
  80         case OHCI_USB_SUSPEND:
  81                 if (!ohci->autostop) {
  82                         ohci_dbg (ohci, "already suspended\n");
  83                         goto done;
  84                 }
  85         }
  86         ohci_dbg (ohci, "%s root hub\n",
  87                         autostop ? "auto-stop" : "suspend");
  88
  89         /* First stop any processing */
  90         if (!autostop && (ohci->hc_control & OHCI_SCHED_ENABLES)) {
  91                 ohci->hc_control &= ~OHCI_SCHED_ENABLES;
  92                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
  93                 ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
  94                 ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrstatus);
  95
  96                 /* sched disables take effect on the next frame,
  97                  * then the last WDH could take 6+ msec
  98                  */
  99                 ohci_dbg (ohci, "stopping schedules ...\n");
 100                 ohci->autostop = 0;
 101                 spin_unlock_irq (&ohci->lock);
 102                 msleep (8);
 103                 spin_lock_irq (&ohci->lock);
 104         }
 105         dl_done_list (ohci);
 106         finish_unlinks (ohci, ohci_frame_no(ohci));
 107
 108         /* maybe resume can wake root hub */
 109         if (device_may_wakeup(&ohci_to_hcd(ohci)->self.root_hub->dev) ||
 110                         autostop)
 111                 ohci->hc_control |= OHCI_CTRL_RWE;
 112         else {
 113                 ohci_writel (ohci, OHCI_INTR_RHSC, &ohci->regs->intrdisable);
 114                 ohci->hc_control &= ~OHCI_CTRL_RWE;
 115         }
 116
 117         /* Suspend hub ... this is the "global (to this bus) suspend" mode,
 118          * which doesn't imply ports will first be individually suspended.
 119          */
 120         ohci->hc_control &= ~OHCI_CTRL_HCFS;
 121         ohci->hc_control |= OHCI_USB_SUSPEND;
 122         ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 123         (void) ohci_readl (ohci, &ohci->regs->control);
 124
 125         /* no resumes until devices finish suspending */
 126         if (!autostop) {
 127                 ohci->next_statechange = jiffies + msecs_to_jiffies (5);
 128                 ohci->autostop = 0;
 129         }
 130
 131 done:
 132         return status;
 133 }
 134
 135 static inline struct ed *find_head (struct ed *ed)
 136 {
 137         /* for bulk and control lists */
 138         while (ed->ed_prev)
 139                 ed = ed->ed_prev;
 140         return ed;
 141 }
 142
 143 /* caller has locked the root hub */
 144 static int ohci_rh_resume (struct ohci_hcd *ohci)
 145 __releases(ohci->lock)
 146 __acquires(ohci->lock)
 147 {
 148         struct usb_hcd          *hcd = ohci_to_hcd (ohci);
 149         u32                     temp, enables;
 150         int                     status = -EINPROGRESS;
 151         int                     autostopped = ohci->autostop;
 152
 153         ohci->autostop = 0;
 154         ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
 155
 156         if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) {
 157                 /* this can happen after resuming a swsusp snapshot */
 158                 if (hcd->state == HC_STATE_RESUMING) {
 159                         ohci_dbg (ohci, "BIOS/SMM active, control %03x\n",
 160                                         ohci->hc_control);
 161                         status = -EBUSY;
 162                 /* this happens when pmcore resumes HC then root */
 163                 } else {
 164                         ohci_dbg (ohci, "duplicate resume\n");
 165                         status = 0;
 166                 }
 167         } else switch (ohci->hc_control & OHCI_CTRL_HCFS) {
 168         case OHCI_USB_SUSPEND:
 169                 ohci->hc_control &= ~(OHCI_CTRL_HCFS|OHCI_SCHED_ENABLES);
 170                 ohci->hc_control |= OHCI_USB_RESUME;
 171                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 172                 (void) ohci_readl (ohci, &ohci->regs->control);
 173                 ohci_dbg (ohci, "%s root hub\n",
 174                                 autostopped ? "auto-start" : "resume");
 175                 break;
 176         case OHCI_USB_RESUME:
 177                 /* HCFS changes sometime after INTR_RD */
 178                 ohci_info(ohci, "%swakeup\n",
 179                                 autostopped ? "auto-" : "");
 180                 break;
 181         case OHCI_USB_OPER:
 182                 /* this can happen after resuming a swsusp snapshot */
 183                 ohci_dbg (ohci, "snapshot resume? reinit\n");
 184                 status = -EBUSY;
 185                 break;
 186         default:                /* RESET, we lost power */
 187                 ohci_dbg (ohci, "lost power\n");
 188                 status = -EBUSY;
 189         }
 190 #ifdef  CONFIG_PM
 191         if (status == -EBUSY) {
 192                 if (!autostopped) {
 193                         spin_unlock_irq (&ohci->lock);
 194                         (void) ohci_init (ohci);
 195                         status = ohci_restart (ohci);
 196                         spin_lock_irq (&ohci->lock);
 197                 }
 198                 return status;
 199         }
 200 #endif
 201         if (status != -EINPROGRESS)
 202                 return status;
 203         if (autostopped)
 204                 goto skip_resume;
 205         spin_unlock_irq (&ohci->lock);
 206
 207         /* Some controllers (lucent erratum) need extra-long delays */
 208         msleep (20 /* usb 11.5.1.10 */ + 12 /* 32 msec counter */ + 1);
 209
 210         temp = ohci_readl (ohci, &ohci->regs->control);
 211         temp &= OHCI_CTRL_HCFS;
 212         if (temp != OHCI_USB_RESUME) {
 213                 ohci_err (ohci, "controller won't resume\n");
 214                 spin_lock_irq(&ohci->lock);
 215                 return -EBUSY;
 216         }
 217
 218         /* disable old schedule state, reinit from scratch */
 219         ohci_writel (ohci, 0, &ohci->regs->ed_controlhead);
 220         ohci_writel (ohci, 0, &ohci->regs->ed_controlcurrent);
 221         ohci_writel (ohci, 0, &ohci->regs->ed_bulkhead);
 222         ohci_writel (ohci, 0, &ohci->regs->ed_bulkcurrent);
 223         ohci_writel (ohci, 0, &ohci->regs->ed_periodcurrent);
 224         ohci_writel (ohci, (u32) ohci->hcca_dma, &ohci->regs->hcca);
 225
 226         /* Sometimes PCI D3 suspend trashes frame timings ... */
 227         periodic_reinit (ohci);
 228
 229         /* the following code is executed with ohci->lock held and
 230          * irqs disabled if and only if autostopped is true
 231          */
 232
 233 skip_resume:
 234         /* interrupts might have been disabled */
 235         ohci_writel (ohci, OHCI_INTR_INIT, &ohci->regs->intrenable);
 236         if (ohci->ed_rm_list)
 237                 ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrenable);
 238
 239         /* Then re-enable operations */
 240         ohci_writel (ohci, OHCI_USB_OPER, &ohci->regs->control);
 241         (void) ohci_readl (ohci, &ohci->regs->control);
 242         if (!autostopped)
 243                 msleep (3);
 244
 245         temp = ohci->hc_control;
 246         temp &= OHCI_CTRL_RWC;
 247         temp |= OHCI_CONTROL_INIT | OHCI_USB_OPER;
 248         ohci->hc_control = temp;
 249         ohci_writel (ohci, temp, &ohci->regs->control);
 250         (void) ohci_readl (ohci, &ohci->regs->control);
 251
 252         /* TRSMRCY */
 253         if (!autostopped) {
 254                 msleep (10);
 255                 spin_lock_irq (&ohci->lock);
 256         }
 257         /* now ohci->lock is always held and irqs are always disabled */
 258
 259         /* keep it alive for more than ~5x suspend + resume costs */
 260         ohci->next_statechange = jiffies + STATECHANGE_DELAY;
 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 #ifdef  CONFIG_PM
 295
 296 static int ohci_bus_suspend (struct usb_hcd *hcd)
 297 {
 298         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
 299         int                     rc;
 300
 301         spin_lock_irq (&ohci->lock);
 302
 303         if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
 304                 rc = -ESHUTDOWN;
 305         else
 306                 rc = ohci_rh_suspend (ohci, 0);
 307         spin_unlock_irq (&ohci->lock);
 308         return rc;
 309 }
 310
 311 static int ohci_bus_resume (struct usb_hcd *hcd)
 312 {
 313         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
 314         int                     rc;
 315
 316         if (time_before (jiffies, ohci->next_statechange))
 317                 msleep(5);
 318
 319         spin_lock_irq (&ohci->lock);
 320
 321         if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
 322                 rc = -ESHUTDOWN;
 323         else
 324                 rc = ohci_rh_resume (ohci);
 325         spin_unlock_irq (&ohci->lock);
 326
 327         /* poll until we know a device is connected or we autostop */
 328         if (rc == 0)
 329                 usb_hcd_poll_rh_status(hcd);
 330         return rc;
 331 }
 332
 333 #endif  /* CONFIG_PM */
 334
 335 /*-------------------------------------------------------------------------*/
 336
 337 /* build "status change" packet (one or two bytes) from HC registers */
 338
 339 static int
 340 ohci_hub_status_data (struct usb_hcd *hcd, char *buf)
 341 {
 342         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 343         int             i, changed = 0, length = 1;
 344         int             any_connected = 0;
 345         unsigned long   flags;
 346
 347         spin_lock_irqsave (&ohci->lock, flags);
 348
 349         /* undocumented erratum seen on at least rev D */
 350         if ((ohci->flags & OHCI_QUIRK_AMD756)
 351                         && (roothub_a (ohci) & RH_A_NDP) > MAX_ROOT_PORTS) {
 352                 ohci_warn (ohci, "bogus NDP, rereads as NDP=%d\n",
 353                           ohci_readl (ohci, &ohci->regs->roothub.a) & RH_A_NDP);
 354                 /* retry later; "should not happen" */
 355                 goto done;
 356         }
 357
 358         /* init status */
 359         if (roothub_status (ohci) & (RH_HS_LPSC | RH_HS_OCIC))
 360                 buf [0] = changed = 1;
 361         else
 362                 buf [0] = 0;
 363         if (ohci->num_ports > 7) {
 364                 buf [1] = 0;
 365                 length++;
 366         }
 367
 368         /* look at each port */
 369         for (i = 0; i < ohci->num_ports; i++) {
 370                 u32     status = roothub_portstatus (ohci, i);
 371
 372                 /* can't autostop if ports are connected */
 373                 any_connected |= (status & RH_PS_CCS);
 374
 375                 if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC
 376                                 | RH_PS_OCIC | RH_PS_PRSC)) {
 377                         changed = 1;
 378                         if (i < 7)
 379                             buf [0] |= 1 << (i + 1);
 380                         else
 381                             buf [1] |= 1 << (i - 7);
 382                 }
 383         }
 384
 385         hcd->poll_rh = 1;
 386
 387         /* carry out appropriate state changes */
 388         switch (ohci->hc_control & OHCI_CTRL_HCFS) {
 389
 390         case OHCI_USB_OPER:
 391                 /* keep on polling until we know a device is connected
 392                  * and RHSC is enabled */
 393                 if (!ohci->autostop) {
 394                         if (any_connected) {
 395                                 if (ohci_readl(ohci, &ohci->regs->intrenable) &
 396                                                 OHCI_INTR_RHSC)
 397                                         hcd->poll_rh = 0;
 398                         } else {
 399                                 ohci->autostop = 1;
 400                                 ohci->next_statechange = jiffies + HZ;
 401                         }
 402
 403                 /* if no devices have been attached for one second, autostop */
 404                 } else {
 405                         if (changed || any_connected) {
 406                                 ohci->autostop = 0;
 407                                 ohci->next_statechange = jiffies +
 408                                                 STATECHANGE_DELAY;
 409                         } else if (device_may_wakeup(&hcd->self.root_hub->dev)
 410                                         && time_after_eq(jiffies,
 411                                                 ohci->next_statechange)
 412                                         && !ohci->ed_rm_list
 413                                         && !(ohci->hc_control &
 414                                                 OHCI_SCHED_ENABLES)) {
 415                                 ohci_rh_suspend (ohci, 1);
 416                         }
 417                 }
 418                 break;
 419
 420         /* if there is a port change, autostart or ask to be resumed */
 421         case OHCI_USB_SUSPEND:
 422         case OHCI_USB_RESUME:
 423                 if (changed) {
 424                         if (ohci->autostop)
 425                                 ohci_rh_resume (ohci);
 426                         else
 427                                 usb_hcd_resume_root_hub (hcd);
 428                 } else {
 429                         /* everything is idle, no need for polling */
 430                         hcd->poll_rh = 0;
 431                 }
 432                 break;
 433         }
 434
 435 done:
 436         spin_unlock_irqrestore (&ohci->lock, flags);
 437
 438         return changed ? length : 0;
 439 }
 440
 441 /*-------------------------------------------------------------------------*/
 442
 443 static void
 444 ohci_hub_descriptor (
 445         struct ohci_hcd                 *ohci,
 446         struct usb_hub_descriptor       *desc
 447 ) {
 448         u32             rh = roothub_a (ohci);
 449         u16             temp;
 450
 451         desc->bDescriptorType = 0x29;
 452         desc->bPwrOn2PwrGood = (rh & RH_A_POTPGT) >> 24;
 453         desc->bHubContrCurrent = 0;
 454
 455         desc->bNbrPorts = ohci->num_ports;
 456         temp = 1 + (ohci->num_ports / 8);
 457         desc->bDescLength = 7 + 2 * temp;
 458
 459         temp = 0;
 460         if (rh & RH_A_NPS)              /* no power switching? */
 461             temp |= 0x0002;
 462         if (rh & RH_A_PSM)              /* per-port power switching? */
 463             temp |= 0x0001;
 464         if (rh & RH_A_NOCP)             /* no overcurrent reporting? */
 465             temp |= 0x0010;
 466         else if (rh & RH_A_OCPM)        /* per-port overcurrent reporting? */
 467             temp |= 0x0008;
 468         desc->wHubCharacteristics = (__force __u16)cpu_to_hc16(ohci, temp);
 469
 470         /* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
 471         rh = roothub_b (ohci);
 472         memset(desc->bitmap, 0xff, sizeof(desc->bitmap));
 473         desc->bitmap [0] = rh & RH_B_DR;
 474         if (ohci->num_ports > 7) {
 475                 desc->bitmap [1] = (rh & RH_B_DR) >> 8;
 476                 desc->bitmap [2] = 0xff;
 477         } else
 478                 desc->bitmap [1] = 0xff;
 479 }
 480
 481 /*-------------------------------------------------------------------------*/
 482
 483 #ifdef  CONFIG_USB_OTG
 484
 485 static int ohci_start_port_reset (struct usb_hcd *hcd, unsigned port)
 486 {
 487         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 488         u32                     status;
 489
 490         if (!port)
 491                 return -EINVAL;
 492         port--;
 493
 494         /* start port reset before HNP protocol times out */
 495         status = ohci_readl(ohci, &ohci->regs->roothub.portstatus [port]);
 496         if (!(status & RH_PS_CCS))
 497                 return -ENODEV;
 498
 499         /* khubd will finish the reset later */
 500         ohci_writel(ohci, RH_PS_PRS, &ohci->regs->roothub.portstatus [port]);
 501         return 0;
 502 }
 503
 504 static void start_hnp(struct ohci_hcd *ohci);
 505
 506 #else
 507
 508 #define ohci_start_port_reset           NULL
 509
 510 #endif
 511
 512 /*-------------------------------------------------------------------------*/
 513
 514
 515 /* See usb 7.1.7.5:  root hubs must issue at least 50 msec reset signaling,
 516  * not necessarily continuous ... to guard against resume signaling.
 517  * The short timeout is safe for non-root hubs, and is backward-compatible
 518  * with earlier Linux hosts.
 519  */
 520 #ifdef  CONFIG_USB_SUSPEND
 521 #define PORT_RESET_MSEC         50
 522 #else
 523 #define PORT_RESET_MSEC         10
 524 #endif
 525
 526 /* this timer value might be vendor-specific ... */
 527 #define PORT_RESET_HW_MSEC      10
 528
 529 /* wrap-aware logic morphed from <linux/jiffies.h> */
 530 #define tick_before(t1,t2) ((s16)(((s16)(t1))-((s16)(t2))) < 0)
 531
 532 /* called from some task, normally khubd */
 533 static inline void root_port_reset (struct ohci_hcd *ohci, unsigned port)
 534 {
 535         __hc32 __iomem *portstat = &ohci->regs->roothub.portstatus [port];
 536         u32     temp;
 537         u16     now = ohci_readl(ohci, &ohci->regs->fmnumber);
 538         u16     reset_done = now + PORT_RESET_MSEC;
 539
 540         /* build a "continuous enough" reset signal, with up to
 541          * 3msec gap between pulses.  scheduler HZ==100 must work;
 542          * this might need to be deadline-scheduled.
 543          */
 544         do {
 545                 /* spin until any current reset finishes */
 546                 for (;;) {
 547                         temp = ohci_readl (ohci, portstat);
 548                         if (!(temp & RH_PS_PRS))
 549                                 break;
 550                         udelay (500);
 551                 }
 552
 553                 if (!(temp & RH_PS_CCS))
 554                         break;
 555                 if (temp & RH_PS_PRSC)
 556                         ohci_writel (ohci, RH_PS_PRSC, portstat);
 557
 558                 /* start the next reset, sleep till it's probably done */
 559                 ohci_writel (ohci, RH_PS_PRS, portstat);
 560                 msleep(PORT_RESET_HW_MSEC);
 561                 now = ohci_readl(ohci, &ohci->regs->fmnumber);
 562         } while (tick_before(now, reset_done));
 563         /* caller synchronizes using PRSC */
 564 }
 565
 566 static int ohci_hub_control (
 567         struct usb_hcd  *hcd,
 568         u16             typeReq,
 569         u16             wValue,
 570         u16             wIndex,
 571         char            *buf,
 572         u16             wLength
 573 ) {
 574         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 575         int             ports = hcd_to_bus (hcd)->root_hub->maxchild;
 576         u32             temp;
 577         int             retval = 0;
 578
 579         if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
 580                 return -ESHUTDOWN;
 581
 582         switch (typeReq) {
 583         case ClearHubFeature:
 584                 switch (wValue) {
 585                 case C_HUB_OVER_CURRENT:
 586                         ohci_writel (ohci, RH_HS_OCIC,
 587                                         &ohci->regs->roothub.status);
 588                 case C_HUB_LOCAL_POWER:
 589                         break;
 590                 default:
 591                         goto error;
 592                 }
 593                 break;
 594         case ClearPortFeature:
 595                 if (!wIndex || wIndex > ports)
 596                         goto error;
 597                 wIndex--;
 598
 599                 switch (wValue) {
 600                 case USB_PORT_FEAT_ENABLE:
 601                         temp = RH_PS_CCS;
 602                         break;
 603                 case USB_PORT_FEAT_C_ENABLE:
 604                         temp = RH_PS_PESC;
 605                         break;
 606                 case USB_PORT_FEAT_SUSPEND:
 607                         temp = RH_PS_POCI;
 608                         break;
 609                 case USB_PORT_FEAT_C_SUSPEND:
 610                         temp = RH_PS_PSSC;
 611                         break;
 612                 case USB_PORT_FEAT_POWER:
 613                         temp = RH_PS_LSDA;
 614                         break;
 615                 case USB_PORT_FEAT_C_CONNECTION:
 616                         temp = RH_PS_CSC;
 617                         break;
 618                 case USB_PORT_FEAT_C_OVER_CURRENT:
 619                         temp = RH_PS_OCIC;
 620                         break;
 621                 case USB_PORT_FEAT_C_RESET:
 622                         temp = RH_PS_PRSC;
 623                         break;
 624                 default:
 625                         goto error;
 626                 }
 627                 ohci_writel (ohci, temp,
 628                                 &ohci->regs->roothub.portstatus [wIndex]);
 629                 // ohci_readl (ohci, &ohci->regs->roothub.portstatus [wIndex]);
 630                 break;
 631         case GetHubDescriptor:
 632                 ohci_hub_descriptor (ohci, (struct usb_hub_descriptor *) buf);
 633                 break;
 634         case GetHubStatus:
 635                 temp = roothub_status (ohci) & ~(RH_HS_CRWE | RH_HS_DRWE);
 636                 put_unaligned(cpu_to_le32 (temp), (__le32 *) buf);
 637                 break;
 638         case GetPortStatus:
 639                 if (!wIndex || wIndex > ports)
 640                         goto error;
 641                 wIndex--;
 642                 temp = roothub_portstatus (ohci, wIndex);
 643                 put_unaligned(cpu_to_le32 (temp), (__le32 *) buf);
 644
 645 #ifndef OHCI_VERBOSE_DEBUG
 646         if (*(u16*)(buf+2))     /* only if wPortChange is interesting */
 647 #endif
 648                 dbg_port (ohci, "GetStatus", wIndex, temp);
 649                 break;
 650         case SetHubFeature:
 651                 switch (wValue) {
 652                 case C_HUB_OVER_CURRENT:
 653                         // FIXME:  this can be cleared, yes?
 654                 case C_HUB_LOCAL_POWER:
 655                         break;
 656                 default:
 657                         goto error;
 658                 }
 659                 break;
 660         case SetPortFeature:
 661                 if (!wIndex || wIndex > ports)
 662                         goto error;
 663                 wIndex--;
 664                 switch (wValue) {
 665                 case USB_PORT_FEAT_SUSPEND:
 666 #ifdef  CONFIG_USB_OTG
 667                         if (hcd->self.otg_port == (wIndex + 1)
 668                                         && hcd->self.b_hnp_enable)
 669                                 start_hnp(ohci);
 670                         else
 671 #endif
 672                         ohci_writel (ohci, RH_PS_PSS,
 673                                 &ohci->regs->roothub.portstatus [wIndex]);
 674                         break;
 675                 case USB_PORT_FEAT_POWER:
 676                         ohci_writel (ohci, RH_PS_PPS,
 677                                 &ohci->regs->roothub.portstatus [wIndex]);
 678                         break;
 679                 case USB_PORT_FEAT_RESET:
 680                         root_port_reset (ohci, wIndex);
 681                         break;
 682                 default:
 683                         goto error;
 684                 }
 685                 break;
 686
 687         default:
 688 error:
 689                 /* "protocol stall" on error */
 690                 retval = -EPIPE;
 691         }
 692         return retval;
 693 }
 694