SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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         temp = ohci->num_ports;
 208         while (temp--) {
 209                 u32 stat = ohci_readl (ohci,
 210                                        &ohci->regs->roothub.portstatus [temp]);
 211
 212                 /* force global, not selective, resume */
 213                 if (!(stat & RH_PS_PSS))
 214                         continue;
 215                 ohci_writel (ohci, RH_PS_POCI,
 216                                 &ohci->regs->roothub.portstatus [temp]);
 217         }
 218
 219         /* Some controllers (lucent erratum) need extra-long delays */
 220         msleep (20 /* usb 11.5.1.10 */ + 12 /* 32 msec counter */ + 1);
 221
 222         temp = ohci_readl (ohci, &ohci->regs->control);
 223         temp &= OHCI_CTRL_HCFS;
 224         if (temp != OHCI_USB_RESUME) {
 225                 ohci_err (ohci, "controller won't resume\n");
 226                 return -EBUSY;
 227         }
 228
 229         /* disable old schedule state, reinit from scratch */
 230         ohci_writel (ohci, 0, &ohci->regs->ed_controlhead);
 231         ohci_writel (ohci, 0, &ohci->regs->ed_controlcurrent);
 232         ohci_writel (ohci, 0, &ohci->regs->ed_bulkhead);
 233         ohci_writel (ohci, 0, &ohci->regs->ed_bulkcurrent);
 234         ohci_writel (ohci, 0, &ohci->regs->ed_periodcurrent);
 235         ohci_writel (ohci, (u32) ohci->hcca_dma, &ohci->regs->hcca);
 236
 237         /* Sometimes PCI D3 suspend trashes frame timings ... */
 238         periodic_reinit (ohci);
 239
 240         /* the following code is executed with ohci->lock held and
 241          * irqs disabled if and only if autostopped is true
 242          */
 243
 244 skip_resume:
 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
 250         /* Then re-enable operations */
 251         ohci_writel (ohci, OHCI_USB_OPER, &ohci->regs->control);
 252         (void) ohci_readl (ohci, &ohci->regs->control);
 253         if (!autostopped)
 254                 msleep (3);
 255
 256         temp = ohci->hc_control;
 257         temp &= OHCI_CTRL_RWC;
 258         temp |= OHCI_CONTROL_INIT | OHCI_USB_OPER;
 259         ohci->hc_control = temp;
 260         ohci_writel (ohci, temp, &ohci->regs->control);
 261         (void) ohci_readl (ohci, &ohci->regs->control);
 262
 263         /* TRSMRCY */
 264         if (!autostopped) {
 265                 msleep (10);
 266                 spin_lock_irq (&ohci->lock);
 267         }
 268         /* now ohci->lock is always held and irqs are always disabled */
 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 #ifdef  CONFIG_PM
 306
 307 static int ohci_bus_suspend (struct usb_hcd *hcd)
 308 {
 309         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
 310         int                     rc;
 311
 312         spin_lock_irq (&ohci->lock);
 313
 314         if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
 315                 rc = -ESHUTDOWN;
 316         else
 317                 rc = ohci_rh_suspend (ohci, 0);
 318         spin_unlock_irq (&ohci->lock);
 319         return rc;
 320 }
 321
 322 static int ohci_bus_resume (struct usb_hcd *hcd)
 323 {
 324         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
 325         int                     rc;
 326
 327         if (time_before (jiffies, ohci->next_statechange))
 328                 msleep(5);
 329
 330         spin_lock_irq (&ohci->lock);
 331
 332         if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
 333                 rc = -ESHUTDOWN;
 334         else
 335                 rc = ohci_rh_resume (ohci);
 336         spin_unlock_irq (&ohci->lock);
 337
 338         /* poll until we know a device is connected or we autostop */
 339         if (rc == 0)
 340                 usb_hcd_poll_rh_status(hcd);
 341         return rc;
 342 }
 343
 344 #endif  /* CONFIG_PM */
 345
 346 /*-------------------------------------------------------------------------*/
 347
 348 /* build "status change" packet (one or two bytes) from HC registers */
 349
 350 static int
 351 ohci_hub_status_data (struct usb_hcd *hcd, char *buf)
 352 {
 353         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 354         int             i, changed = 0, length = 1;
 355         int             any_connected = 0;
 356         unsigned long   flags;
 357
 358         spin_lock_irqsave (&ohci->lock, flags);
 359
 360         /* undocumented erratum seen on at least rev D */
 361         if ((ohci->flags & OHCI_QUIRK_AMD756)
 362                         && (roothub_a (ohci) & RH_A_NDP) > MAX_ROOT_PORTS) {
 363                 ohci_warn (ohci, "bogus NDP, rereads as NDP=%d\n",
 364                           ohci_readl (ohci, &ohci->regs->roothub.a) & RH_A_NDP);
 365                 /* retry later; "should not happen" */
 366                 goto done;
 367         }
 368
 369         /* init status */
 370         if (roothub_status (ohci) & (RH_HS_LPSC | RH_HS_OCIC))
 371                 buf [0] = changed = 1;
 372         else
 373                 buf [0] = 0;
 374         if (ohci->num_ports > 7) {
 375                 buf [1] = 0;
 376                 length++;
 377         }
 378
 379         /* look at each port */
 380         for (i = 0; i < ohci->num_ports; i++) {
 381                 u32     status = roothub_portstatus (ohci, i);
 382
 383                 /* can't autostop if ports are connected */
 384                 any_connected |= (status & RH_PS_CCS);
 385
 386                 if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC
 387                                 | RH_PS_OCIC | RH_PS_PRSC)) {
 388                         changed = 1;
 389                         if (i < 7)
 390                             buf [0] |= 1 << (i + 1);
 391                         else
 392                             buf [1] |= 1 << (i - 7);
 393                 }
 394         }
 395
 396         hcd->poll_rh = 1;
 397
 398         /* carry out appropriate state changes */
 399         switch (ohci->hc_control & OHCI_CTRL_HCFS) {
 400
 401         case OHCI_USB_OPER:
 402                 /* keep on polling until we know a device is connected
 403                  * and RHSC is enabled */
 404                 if (!ohci->autostop) {
 405                         if (any_connected) {
 406                                 if (ohci_readl(ohci, &ohci->regs->intrenable) &
 407                                                 OHCI_INTR_RHSC)
 408                                         hcd->poll_rh = 0;
 409                         } else {
 410                                 ohci->autostop = 1;
 411                                 ohci->next_statechange = jiffies + HZ;
 412                         }
 413
 414                 /* if no devices have been attached for one second, autostop */
 415                 } else {
 416                         if (changed || any_connected) {
 417                                 ohci->autostop = 0;
 418                                 ohci->next_statechange = jiffies +
 419                                                 STATECHANGE_DELAY;
 420                         } else if (device_may_wakeup(&hcd->self.root_hub->dev)
 421                                         && time_after_eq(jiffies,
 422                                                 ohci->next_statechange)
 423                                         && !ohci->ed_rm_list
 424                                         && !(ohci->hc_control &
 425                                                 OHCI_SCHED_ENABLES)) {
 426                                 ohci_rh_suspend (ohci, 1);
 427                         }
 428                 }
 429                 break;
 430
 431         /* if there is a port change, autostart or ask to be resumed */
 432         case OHCI_USB_SUSPEND:
 433         case OHCI_USB_RESUME:
 434                 if (changed) {
 435                         if (ohci->autostop)
 436                                 ohci_rh_resume (ohci);
 437                         else
 438                                 usb_hcd_resume_root_hub (hcd);
 439                 } else {
 440                         /* everything is idle, no need for polling */
 441                         hcd->poll_rh = 0;
 442                 }
 443                 break;
 444         }
 445
 446 done:
 447         spin_unlock_irqrestore (&ohci->lock, flags);
 448
 449         return changed ? length : 0;
 450 }
 451
 452 /*-------------------------------------------------------------------------*/
 453
 454 static void
 455 ohci_hub_descriptor (
 456         struct ohci_hcd                 *ohci,
 457         struct usb_hub_descriptor       *desc
 458 ) {
 459         u32             rh = roothub_a (ohci);
 460         u16             temp;
 461
 462         desc->bDescriptorType = 0x29;
 463         desc->bPwrOn2PwrGood = (rh & RH_A_POTPGT) >> 24;
 464         desc->bHubContrCurrent = 0;
 465
 466         desc->bNbrPorts = ohci->num_ports;
 467         temp = 1 + (ohci->num_ports / 8);
 468         desc->bDescLength = 7 + 2 * temp;
 469
 470         temp = 0;
 471         if (rh & RH_A_NPS)              /* no power switching? */
 472             temp |= 0x0002;
 473         if (rh & RH_A_PSM)              /* per-port power switching? */
 474             temp |= 0x0001;
 475         if (rh & RH_A_NOCP)             /* no overcurrent reporting? */
 476             temp |= 0x0010;
 477         else if (rh & RH_A_OCPM)        /* per-port overcurrent reporting? */
 478             temp |= 0x0008;
 479         desc->wHubCharacteristics = (__force __u16)cpu_to_hc16(ohci, temp);
 480
 481         /* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
 482         rh = roothub_b (ohci);
 483         memset(desc->bitmap, 0xff, sizeof(desc->bitmap));
 484         desc->bitmap [0] = rh & RH_B_DR;
 485         if (ohci->num_ports > 7) {
 486                 desc->bitmap [1] = (rh & RH_B_DR) >> 8;
 487                 desc->bitmap [2] = 0xff;
 488         } else
 489                 desc->bitmap [1] = 0xff;
 490 }
 491
 492 /*-------------------------------------------------------------------------*/
 493
 494 #ifdef  CONFIG_USB_OTG
 495
 496 static int ohci_start_port_reset (struct usb_hcd *hcd, unsigned port)
 497 {
 498         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 499         u32                     status;
 500
 501         if (!port)
 502                 return -EINVAL;
 503         port--;
 504
 505         /* start port reset before HNP protocol times out */
 506         status = ohci_readl(ohci, &ohci->regs->roothub.portstatus [port]);
 507         if (!(status & RH_PS_CCS))
 508                 return -ENODEV;
 509
 510         /* khubd will finish the reset later */
 511         ohci_writel(ohci, RH_PS_PRS, &ohci->regs->roothub.portstatus [port]);
 512         return 0;
 513 }
 514
 515 static void start_hnp(struct ohci_hcd *ohci);
 516
 517 #else
 518
 519 #define ohci_start_port_reset           NULL
 520
 521 #endif
 522
 523 /*-------------------------------------------------------------------------*/
 524
 525
 526 /* See usb 7.1.7.5:  root hubs must issue at least 50 msec reset signaling,
 527  * not necessarily continuous ... to guard against resume signaling.
 528  * The short timeout is safe for non-root hubs, and is backward-compatible
 529  * with earlier Linux hosts.
 530  */
 531 #ifdef  CONFIG_USB_SUSPEND
 532 #define PORT_RESET_MSEC         50
 533 #else
 534 #define PORT_RESET_MSEC         10
 535 #endif
 536
 537 /* this timer value might be vendor-specific ... */
 538 #define PORT_RESET_HW_MSEC      10
 539
 540 /* wrap-aware logic morphed from <linux/jiffies.h> */
 541 #define tick_before(t1,t2) ((s16)(((s16)(t1))-((s16)(t2))) < 0)
 542
 543 /* called from some task, normally khubd */
 544 static inline void root_port_reset (struct ohci_hcd *ohci, unsigned port)
 545 {
 546         __hc32 __iomem *portstat = &ohci->regs->roothub.portstatus [port];
 547         u32     temp;
 548         u16     now = ohci_readl(ohci, &ohci->regs->fmnumber);
 549         u16     reset_done = now + PORT_RESET_MSEC;
 550
 551         /* build a "continuous enough" reset signal, with up to
 552          * 3msec gap between pulses.  scheduler HZ==100 must work;
 553          * this might need to be deadline-scheduled.
 554          */
 555         do {
 556                 /* spin until any current reset finishes */
 557                 for (;;) {
 558                         temp = ohci_readl (ohci, portstat);
 559                         if (!(temp & RH_PS_PRS))
 560                                 break;
 561                         udelay (500);
 562                 }
 563
 564                 if (!(temp & RH_PS_CCS))
 565                         break;
 566                 if (temp & RH_PS_PRSC)
 567                         ohci_writel (ohci, RH_PS_PRSC, portstat);
 568
 569                 /* start the next reset, sleep till it's probably done */
 570                 ohci_writel (ohci, RH_PS_PRS, portstat);
 571                 msleep(PORT_RESET_HW_MSEC);
 572                 now = ohci_readl(ohci, &ohci->regs->fmnumber);
 573         } while (tick_before(now, reset_done));
 574         /* caller synchronizes using PRSC */
 575 }
 576
 577 static int ohci_hub_control (
 578         struct usb_hcd  *hcd,
 579         u16             typeReq,
 580         u16             wValue,
 581         u16             wIndex,
 582         char            *buf,
 583         u16             wLength
 584 ) {
 585         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 586         int             ports = hcd_to_bus (hcd)->root_hub->maxchild;
 587         u32             temp;
 588         int             retval = 0;
 589
 590         if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
 591                 return -ESHUTDOWN;
 592
 593         switch (typeReq) {
 594         case ClearHubFeature:
 595                 switch (wValue) {
 596                 case C_HUB_OVER_CURRENT:
 597                         ohci_writel (ohci, RH_HS_OCIC,
 598                                         &ohci->regs->roothub.status);
 599                 case C_HUB_LOCAL_POWER:
 600                         break;
 601                 default:
 602                         goto error;
 603                 }
 604                 break;
 605         case ClearPortFeature:
 606                 if (!wIndex || wIndex > ports)
 607                         goto error;
 608                 wIndex--;
 609
 610                 switch (wValue) {
 611                 case USB_PORT_FEAT_ENABLE:
 612                         temp = RH_PS_CCS;
 613                         break;
 614                 case USB_PORT_FEAT_C_ENABLE:
 615                         temp = RH_PS_PESC;
 616                         break;
 617                 case USB_PORT_FEAT_SUSPEND:
 618                         temp = RH_PS_POCI;
 619                         break;
 620                 case USB_PORT_FEAT_C_SUSPEND:
 621                         temp = RH_PS_PSSC;
 622                         break;
 623                 case USB_PORT_FEAT_POWER:
 624                         temp = RH_PS_LSDA;
 625                         break;
 626                 case USB_PORT_FEAT_C_CONNECTION:
 627                         temp = RH_PS_CSC;
 628                         break;
 629                 case USB_PORT_FEAT_C_OVER_CURRENT:
 630                         temp = RH_PS_OCIC;
 631                         break;
 632                 case USB_PORT_FEAT_C_RESET:
 633                         temp = RH_PS_PRSC;
 634                         break;
 635                 default:
 636                         goto error;
 637                 }
 638                 ohci_writel (ohci, temp,
 639                                 &ohci->regs->roothub.portstatus [wIndex]);
 640                 // ohci_readl (ohci, &ohci->regs->roothub.portstatus [wIndex]);
 641                 break;
 642         case GetHubDescriptor:
 643                 ohci_hub_descriptor (ohci, (struct usb_hub_descriptor *) buf);
 644                 break;
 645         case GetHubStatus:
 646                 temp = roothub_status (ohci) & ~(RH_HS_CRWE | RH_HS_DRWE);
 647                 put_unaligned(cpu_to_le32 (temp), (__le32 *) buf);
 648                 break;
 649         case GetPortStatus:
 650                 if (!wIndex || wIndex > ports)
 651                         goto error;
 652                 wIndex--;
 653                 temp = roothub_portstatus (ohci, wIndex);
 654                 put_unaligned(cpu_to_le32 (temp), (__le32 *) buf);
 655
 656 #ifndef OHCI_VERBOSE_DEBUG
 657         if (*(u16*)(buf+2))     /* only if wPortChange is interesting */
 658 #endif
 659                 dbg_port (ohci, "GetStatus", wIndex, temp);
 660                 break;
 661         case SetHubFeature:
 662                 switch (wValue) {
 663                 case C_HUB_OVER_CURRENT:
 664                         // FIXME:  this can be cleared, yes?
 665                 case C_HUB_LOCAL_POWER:
 666                         break;
 667                 default:
 668                         goto error;
 669                 }
 670                 break;
 671         case SetPortFeature:
 672                 if (!wIndex || wIndex > ports)
 673                         goto error;
 674                 wIndex--;
 675                 switch (wValue) {
 676                 case USB_PORT_FEAT_SUSPEND:
 677 #ifdef  CONFIG_USB_OTG
 678                         if (hcd->self.otg_port == (wIndex + 1)
 679                                         && hcd->self.b_hnp_enable)
 680                                 start_hnp(ohci);
 681                         else
 682 #endif
 683                         ohci_writel (ohci, RH_PS_PSS,
 684                                 &ohci->regs->roothub.portstatus [wIndex]);
 685                         break;
 686                 case USB_PORT_FEAT_POWER:
 687                         ohci_writel (ohci, RH_PS_PPS,
 688                                 &ohci->regs->roothub.portstatus [wIndex]);
 689                         break;
 690                 case USB_PORT_FEAT_RESET:
 691                         root_port_reset (ohci, wIndex);
 692                         break;
 693                 default:
 694                         goto error;
 695                 }
 696                 break;
 697
 698         default:
 699 error:
 700                 /* "protocol stall" on error */
 701                 retval = -EPIPE;
 702         }
 703         return retval;
 704 }
 705