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 #define OHCI_SCHED_ENABLES \
  48         (OHCI_CTRL_CLE|OHCI_CTRL_BLE|OHCI_CTRL_PLE|OHCI_CTRL_IE)
  49
  50 static void dl_done_list (struct ohci_hcd *);
  51 static void finish_unlinks (struct ohci_hcd *, u16);
  52
  53 #ifdef  CONFIG_PM
  54 static int ohci_restart(struct ohci_hcd *ohci);
  55 #endif
  56
  57 static int ohci_rh_suspend (struct ohci_hcd *ohci, int autostop)
  58 __releases(ohci->lock)
  59 __acquires(ohci->lock)
  60 {
  61         int                     status = 0;
  62
  63         ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
  64         switch (ohci->hc_control & OHCI_CTRL_HCFS) {
  65         case OHCI_USB_RESUME:
  66                 ohci_dbg (ohci, "resume/suspend?\n");
  67                 ohci->hc_control &= ~OHCI_CTRL_HCFS;
  68                 ohci->hc_control |= OHCI_USB_RESET;
  69                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
  70                 (void) ohci_readl (ohci, &ohci->regs->control);
  71                 /* FALL THROUGH */
  72         case OHCI_USB_RESET:
  73                 status = -EBUSY;
  74                 ohci_dbg (ohci, "needs reinit!\n");
  75                 goto done;
  76         case OHCI_USB_SUSPEND:
  77                 if (!ohci->autostop) {
  78                         ohci_dbg (ohci, "already suspended\n");
  79                         goto done;
  80                 }
  81         }
  82         ohci_dbg (ohci, "%s root hub\n",
  83                         autostop ? "auto-stop" : "suspend");
  84
  85         /* First stop any processing */
  86         if (!autostop && (ohci->hc_control & OHCI_SCHED_ENABLES)) {
  87                 ohci->hc_control &= ~OHCI_SCHED_ENABLES;
  88                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
  89                 ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
  90                 ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrstatus);
  91
  92                 /* sched disables take effect on the next frame,
  93                  * then the last WDH could take 6+ msec
  94                  */
  95                 ohci_dbg (ohci, "stopping schedules ...\n");
  96                 ohci->autostop = 0;
  97                 spin_unlock_irq (&ohci->lock);
  98                 msleep (8);
  99                 spin_lock_irq (&ohci->lock);
 100         }
 101         dl_done_list (ohci);
 102         finish_unlinks (ohci, ohci_frame_no(ohci));
 103
 104         /* maybe resume can wake root hub */
 105         if (device_may_wakeup(&ohci_to_hcd(ohci)->self.root_hub->dev) ||
 106                         autostop)
 107                 ohci->hc_control |= OHCI_CTRL_RWE;
 108         else {
 109                 ohci_writel (ohci, OHCI_INTR_RHSC, &ohci->regs->intrdisable);
 110                 ohci->hc_control &= ~OHCI_CTRL_RWE;
 111         }
 112
 113         /* Suspend hub ... this is the "global (to this bus) suspend" mode,
 114          * which doesn't imply ports will first be individually suspended.
 115          */
 116         ohci->hc_control &= ~OHCI_CTRL_HCFS;
 117         ohci->hc_control |= OHCI_USB_SUSPEND;
 118         ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 119         (void) ohci_readl (ohci, &ohci->regs->control);
 120
 121         /* no resumes until devices finish suspending */
 122         if (!autostop) {
 123                 ohci->next_statechange = jiffies + msecs_to_jiffies (5);
 124                 ohci->autostop = 0;
 125         }
 126
 127 done:
 128         return status;
 129 }
 130
 131 static inline struct ed *find_head (struct ed *ed)
 132 {
 133         /* for bulk and control lists */
 134         while (ed->ed_prev)
 135                 ed = ed->ed_prev;
 136         return ed;
 137 }
 138
 139 /* caller has locked the root hub */
 140 static int ohci_rh_resume (struct ohci_hcd *ohci)
 141 __releases(ohci->lock)
 142 __acquires(ohci->lock)
 143 {
 144         struct usb_hcd          *hcd = ohci_to_hcd (ohci);
 145         u32                     temp, enables;
 146         int                     status = -EINPROGRESS;
 147         int                     autostopped = ohci->autostop;
 148
 149         ohci->autostop = 0;
 150         ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
 151
 152         if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) {
 153                 /* this can happen after resuming a swsusp snapshot */
 154                 if (hcd->state == HC_STATE_RESUMING) {
 155                         ohci_dbg (ohci, "BIOS/SMM active, control %03x\n",
 156                                         ohci->hc_control);
 157                         status = -EBUSY;
 158                 /* this happens when pmcore resumes HC then root */
 159                 } else {
 160                         ohci_dbg (ohci, "duplicate resume\n");
 161                         status = 0;
 162                 }
 163         } else switch (ohci->hc_control & OHCI_CTRL_HCFS) {
 164         case OHCI_USB_SUSPEND:
 165                 ohci->hc_control &= ~(OHCI_CTRL_HCFS|OHCI_SCHED_ENABLES);
 166                 ohci->hc_control |= OHCI_USB_RESUME;
 167                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 168                 (void) ohci_readl (ohci, &ohci->regs->control);
 169                 ohci_dbg (ohci, "%s root hub\n",
 170                                 autostopped ? "auto-start" : "resume");
 171                 break;
 172         case OHCI_USB_RESUME:
 173                 /* HCFS changes sometime after INTR_RD */
 174                 ohci_info(ohci, "%swakeup\n",
 175                                 autostopped ? "auto-" : "");
 176                 break;
 177         case OHCI_USB_OPER:
 178                 /* this can happen after resuming a swsusp snapshot */
 179                 ohci_dbg (ohci, "snapshot resume? reinit\n");
 180                 status = -EBUSY;
 181                 break;
 182         default:                /* RESET, we lost power */
 183                 ohci_dbg (ohci, "lost power\n");
 184                 status = -EBUSY;
 185         }
 186 #ifdef  CONFIG_PM
 187         if (status == -EBUSY) {
 188                 if (!autostopped) {
 189                         spin_unlock_irq (&ohci->lock);
 190                         (void) ohci_init (ohci);
 191                         status = ohci_restart (ohci);
 192                         spin_lock_irq (&ohci->lock);
 193                 }
 194                 return status;
 195         }
 196 #endif
 197         if (status != -EINPROGRESS)
 198                 return status;
 199         if (autostopped)
 200                 goto skip_resume;
 201         spin_unlock_irq (&ohci->lock);
 202
 203         temp = ohci->num_ports;
 204         while (temp--) {
 205                 u32 stat = ohci_readl (ohci,
 206                                        &ohci->regs->roothub.portstatus [temp]);
 207
 208                 /* force global, not selective, resume */
 209                 if (!(stat & RH_PS_PSS))
 210                         continue;
 211                 ohci_writel (ohci, RH_PS_POCI,
 212                                 &ohci->regs->roothub.portstatus [temp]);
 213         }
 214
 215         /* Some controllers (lucent erratum) need extra-long delays */
 216         msleep (20 /* usb 11.5.1.10 */ + 12 /* 32 msec counter */ + 1);
 217
 218         temp = ohci_readl (ohci, &ohci->regs->control);
 219         temp &= OHCI_CTRL_HCFS;
 220         if (temp != OHCI_USB_RESUME) {
 221                 ohci_err (ohci, "controller won't resume\n");
 222                 return -EBUSY;
 223         }
 224
 225         /* disable old schedule state, reinit from scratch */
 226         ohci_writel (ohci, 0, &ohci->regs->ed_controlhead);
 227         ohci_writel (ohci, 0, &ohci->regs->ed_controlcurrent);
 228         ohci_writel (ohci, 0, &ohci->regs->ed_bulkhead);
 229         ohci_writel (ohci, 0, &ohci->regs->ed_bulkcurrent);
 230         ohci_writel (ohci, 0, &ohci->regs->ed_periodcurrent);
 231         ohci_writel (ohci, (u32) ohci->hcca_dma, &ohci->regs->hcca);
 232
 233         /* Sometimes PCI D3 suspend trashes frame timings ... */
 234         periodic_reinit (ohci);
 235
 236         /* the following code is executed with ohci->lock held and
 237          * irqs disabled if and only if autostopped is true
 238          */
 239
 240 skip_resume:
 241         /* interrupts might have been disabled */
 242         ohci_writel (ohci, OHCI_INTR_INIT, &ohci->regs->intrenable);
 243         if (ohci->ed_rm_list)
 244                 ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrenable);
 245
 246         /* Then re-enable operations */
 247         ohci_writel (ohci, OHCI_USB_OPER, &ohci->regs->control);
 248         (void) ohci_readl (ohci, &ohci->regs->control);
 249         if (!autostopped)
 250                 msleep (3);
 251
 252         temp = ohci->hc_control;
 253         temp &= OHCI_CTRL_RWC;
 254         temp |= OHCI_CONTROL_INIT | OHCI_USB_OPER;
 255         ohci->hc_control = temp;
 256         ohci_writel (ohci, temp, &ohci->regs->control);
 257         (void) ohci_readl (ohci, &ohci->regs->control);
 258
 259         /* TRSMRCY */
 260         if (!autostopped) {
 261                 msleep (10);
 262                 spin_lock_irq (&ohci->lock);
 263         }
 264         /* now ohci->lock is always held and irqs are always disabled */
 265
 266         /* keep it alive for more than ~5x suspend + resume costs */
 267         ohci->next_statechange = jiffies + STATECHANGE_DELAY;
 268
 269         /* maybe turn schedules back on */
 270         enables = 0;
 271         temp = 0;
 272         if (!ohci->ed_rm_list) {
 273                 if (ohci->ed_controltail) {
 274                         ohci_writel (ohci,
 275                                         find_head (ohci->ed_controltail)->dma,
 276                                         &ohci->regs->ed_controlhead);
 277                         enables |= OHCI_CTRL_CLE;
 278                         temp |= OHCI_CLF;
 279                 }
 280                 if (ohci->ed_bulktail) {
 281                         ohci_writel (ohci, find_head (ohci->ed_bulktail)->dma,
 282                                 &ohci->regs->ed_bulkhead);
 283                         enables |= OHCI_CTRL_BLE;
 284                         temp |= OHCI_BLF;
 285                 }
 286         }
 287         if (hcd->self.bandwidth_isoc_reqs || hcd->self.bandwidth_int_reqs)
 288                 enables |= OHCI_CTRL_PLE|OHCI_CTRL_IE;
 289         if (enables) {
 290                 ohci_dbg (ohci, "restarting schedules ... %08x\n", enables);
 291                 ohci->hc_control |= enables;
 292                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 293                 if (temp)
 294                         ohci_writel (ohci, temp, &ohci->regs->cmdstatus);
 295                 (void) ohci_readl (ohci, &ohci->regs->control);
 296         }
 297
 298         return 0;
 299 }
 300
 301 #ifdef  CONFIG_PM
 302
 303 static int ohci_bus_suspend (struct usb_hcd *hcd)
 304 {
 305         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
 306         int                     rc;
 307
 308         spin_lock_irq (&ohci->lock);
 309
 310         if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
 311                 rc = -ESHUTDOWN;
 312         else
 313                 rc = ohci_rh_suspend (ohci, 0);
 314         spin_unlock_irq (&ohci->lock);
 315         return rc;
 316 }
 317
 318 static int ohci_bus_resume (struct usb_hcd *hcd)
 319 {
 320         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
 321         int                     rc;
 322
 323         if (time_before (jiffies, ohci->next_statechange))
 324                 msleep(5);
 325
 326         spin_lock_irq (&ohci->lock);
 327
 328         if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
 329                 rc = -ESHUTDOWN;
 330         else
 331                 rc = ohci_rh_resume (ohci);
 332         spin_unlock_irq (&ohci->lock);
 333
 334         /* poll until we know a device is connected or we autostop */
 335         if (rc == 0)
 336                 usb_hcd_poll_rh_status(hcd);
 337         return rc;
 338 }
 339
 340 #endif  /* CONFIG_PM */
 341
 342 /*-------------------------------------------------------------------------*/
 343
 344 /* build "status change" packet (one or two bytes) from HC registers */
 345
 346 static int
 347 ohci_hub_status_data (struct usb_hcd *hcd, char *buf)
 348 {
 349         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 350         int             i, changed = 0, length = 1;
 351         int             any_connected = 0, rhsc_enabled = 1;
 352         unsigned long   flags;
 353
 354         spin_lock_irqsave (&ohci->lock, flags);
 355
 356         /* undocumented erratum seen on at least rev D */
 357         if ((ohci->flags & OHCI_QUIRK_AMD756)
 358                         && (roothub_a (ohci) & RH_A_NDP) > MAX_ROOT_PORTS) {
 359                 ohci_warn (ohci, "bogus NDP, rereads as NDP=%d\n",
 360                           ohci_readl (ohci, &ohci->regs->roothub.a) & RH_A_NDP);
 361                 /* retry later; "should not happen" */
 362                 goto done;
 363         }
 364
 365         /* init status */
 366         if (roothub_status (ohci) & (RH_HS_LPSC | RH_HS_OCIC))
 367                 buf [0] = changed = 1;
 368         else
 369                 buf [0] = 0;
 370         if (ohci->num_ports > 7) {
 371                 buf [1] = 0;
 372                 length++;
 373         }
 374
 375         /* look at each port */
 376         for (i = 0; i < ohci->num_ports; i++) {
 377                 u32     status = roothub_portstatus (ohci, i);
 378
 379                 /* can't autostop if ports are connected */
 380                 any_connected |= (status & RH_PS_CCS);
 381
 382                 if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC
 383                                 | RH_PS_OCIC | RH_PS_PRSC)) {
 384                         changed = 1;
 385                         if (i < 7)
 386                             buf [0] |= 1 << (i + 1);
 387                         else
 388                             buf [1] |= 1 << (i - 7);
 389                 }
 390         }
 391
 392         /* NOTE:  vendors didn't always make the same implementation
 393          * choices for RHSC.  Sometimes it triggers on an edge (like
 394          * setting and maybe clearing a port status change bit); and
 395          * it's level-triggered on other silicon, active until khubd
 396          * clears all active port status change bits.  If it's still
 397          * set (level-triggered) we must disable it and rely on
 398          * polling until khubd re-enables it.
 399          */
 400         if (ohci_readl (ohci, &ohci->regs->intrstatus) & OHCI_INTR_RHSC) {
 401                 ohci_writel (ohci, OHCI_INTR_RHSC, &ohci->regs->intrdisable);
 402                 (void) ohci_readl (ohci, &ohci->regs->intrdisable);
 403                 rhsc_enabled = 0;
 404         }
 405         hcd->poll_rh = 1;
 406
 407         /* carry out appropriate state changes */
 408         switch (ohci->hc_control & OHCI_CTRL_HCFS) {
 409
 410         case OHCI_USB_OPER:
 411                 /* keep on polling until we know a device is connected
 412                  * and RHSC is enabled */
 413                 if (!ohci->autostop) {
 414                         if (any_connected) {
 415                                 if (rhsc_enabled)
 416                                         hcd->poll_rh = 0;
 417                         } else {
 418                                 ohci->autostop = 1;
 419                                 ohci->next_statechange = jiffies + HZ;
 420                         }
 421
 422                 /* if no devices have been attached for one second, autostop */
 423                 } else {
 424                         if (changed || any_connected) {
 425                                 ohci->autostop = 0;
 426                                 ohci->next_statechange = jiffies +
 427                                                 STATECHANGE_DELAY;
 428                         } else if (device_may_wakeup(&hcd->self.root_hub->dev)
 429                                         && time_after_eq(jiffies,
 430                                                 ohci->next_statechange)
 431                                         && !ohci->ed_rm_list
 432                                         && !(ohci->hc_control &
 433                                                 OHCI_SCHED_ENABLES)) {
 434                                 ohci_rh_suspend (ohci, 1);
 435                         }
 436                 }
 437                 break;
 438
 439         /* if there is a port change, autostart or ask to be resumed */
 440         case OHCI_USB_SUSPEND:
 441         case OHCI_USB_RESUME:
 442                 if (changed) {
 443                         if (ohci->autostop)
 444                                 ohci_rh_resume (ohci);
 445                         else
 446                                 usb_hcd_resume_root_hub (hcd);
 447                 } else {
 448                         /* everything is idle, no need for polling */
 449                         hcd->poll_rh = 0;
 450                 }
 451                 break;
 452         }
 453
 454 done:
 455         spin_unlock_irqrestore (&ohci->lock, flags);
 456
 457         return changed ? length : 0;
 458 }
 459
 460 /*-------------------------------------------------------------------------*/
 461
 462 static void
 463 ohci_hub_descriptor (
 464         struct ohci_hcd                 *ohci,
 465         struct usb_hub_descriptor       *desc
 466 ) {
 467         u32             rh = roothub_a (ohci);
 468         u16             temp;
 469
 470         desc->bDescriptorType = 0x29;
 471         desc->bPwrOn2PwrGood = (rh & RH_A_POTPGT) >> 24;
 472         desc->bHubContrCurrent = 0;
 473
 474         desc->bNbrPorts = ohci->num_ports;
 475         temp = 1 + (ohci->num_ports / 8);
 476         desc->bDescLength = 7 + 2 * temp;
 477
 478         temp = 0;
 479         if (rh & RH_A_NPS)              /* no power switching? */
 480             temp |= 0x0002;
 481         if (rh & RH_A_PSM)              /* per-port power switching? */
 482             temp |= 0x0001;
 483         if (rh & RH_A_NOCP)             /* no overcurrent reporting? */
 484             temp |= 0x0010;
 485         else if (rh & RH_A_OCPM)        /* per-port overcurrent reporting? */
 486             temp |= 0x0008;
 487         desc->wHubCharacteristics = (__force __u16)cpu_to_hc16(ohci, temp);
 488
 489         /* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
 490         rh = roothub_b (ohci);
 491         memset(desc->bitmap, 0xff, sizeof(desc->bitmap));
 492         desc->bitmap [0] = rh & RH_B_DR;
 493         if (ohci->num_ports > 7) {
 494                 desc->bitmap [1] = (rh & RH_B_DR) >> 8;
 495                 desc->bitmap [2] = 0xff;
 496         } else
 497                 desc->bitmap [1] = 0xff;
 498 }
 499
 500 /*-------------------------------------------------------------------------*/
 501
 502 #ifdef  CONFIG_USB_OTG
 503
 504 static int ohci_start_port_reset (struct usb_hcd *hcd, unsigned port)
 505 {
 506         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 507         u32                     status;
 508
 509         if (!port)
 510                 return -EINVAL;
 511         port--;
 512
 513         /* start port reset before HNP protocol times out */
 514         status = ohci_readl(ohci, &ohci->regs->roothub.portstatus [port]);
 515         if (!(status & RH_PS_CCS))
 516                 return -ENODEV;
 517
 518         /* khubd will finish the reset later */
 519         ohci_writel(ohci, RH_PS_PRS, &ohci->regs->roothub.portstatus [port]);
 520         return 0;
 521 }
 522
 523 static void start_hnp(struct ohci_hcd *ohci);
 524
 525 #else
 526
 527 #define ohci_start_port_reset           NULL
 528
 529 #endif
 530
 531 /*-------------------------------------------------------------------------*/
 532
 533
 534 /* See usb 7.1.7.5:  root hubs must issue at least 50 msec reset signaling,
 535  * not necessarily continuous ... to guard against resume signaling.
 536  * The short timeout is safe for non-root hubs, and is backward-compatible
 537  * with earlier Linux hosts.
 538  */
 539 #ifdef  CONFIG_USB_SUSPEND
 540 #define PORT_RESET_MSEC         50
 541 #else
 542 #define PORT_RESET_MSEC         10
 543 #endif
 544
 545 /* this timer value might be vendor-specific ... */
 546 #define PORT_RESET_HW_MSEC      10
 547
 548 /* wrap-aware logic morphed from <linux/jiffies.h> */
 549 #define tick_before(t1,t2) ((s16)(((s16)(t1))-((s16)(t2))) < 0)
 550
 551 /* called from some task, normally khubd */
 552 static inline void root_port_reset (struct ohci_hcd *ohci, unsigned port)
 553 {
 554         __hc32 __iomem *portstat = &ohci->regs->roothub.portstatus [port];
 555         u32     temp;
 556         u16     now = ohci_readl(ohci, &ohci->regs->fmnumber);
 557         u16     reset_done = now + PORT_RESET_MSEC;
 558
 559         /* build a "continuous enough" reset signal, with up to
 560          * 3msec gap between pulses.  scheduler HZ==100 must work;
 561          * this might need to be deadline-scheduled.
 562          */
 563         do {
 564                 /* spin until any current reset finishes */
 565                 for (;;) {
 566                         temp = ohci_readl (ohci, portstat);
 567                         if (!(temp & RH_PS_PRS))
 568                                 break;
 569                         udelay (500);
 570                 }
 571
 572                 if (!(temp & RH_PS_CCS))
 573                         break;
 574                 if (temp & RH_PS_PRSC)
 575                         ohci_writel (ohci, RH_PS_PRSC, portstat);
 576
 577                 /* start the next reset, sleep till it's probably done */
 578                 ohci_writel (ohci, RH_PS_PRS, portstat);
 579                 msleep(PORT_RESET_HW_MSEC);
 580                 now = ohci_readl(ohci, &ohci->regs->fmnumber);
 581         } while (tick_before(now, reset_done));
 582         /* caller synchronizes using PRSC */
 583 }
 584
 585 static int ohci_hub_control (
 586         struct usb_hcd  *hcd,
 587         u16             typeReq,
 588         u16             wValue,
 589         u16             wIndex,
 590         char            *buf,
 591         u16             wLength
 592 ) {
 593         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 594         int             ports = hcd_to_bus (hcd)->root_hub->maxchild;
 595         u32             temp;
 596         int             retval = 0;
 597
 598         if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
 599                 return -ESHUTDOWN;
 600
 601         switch (typeReq) {
 602         case ClearHubFeature:
 603                 switch (wValue) {
 604                 case C_HUB_OVER_CURRENT:
 605                         ohci_writel (ohci, RH_HS_OCIC,
 606                                         &ohci->regs->roothub.status);
 607                 case C_HUB_LOCAL_POWER:
 608                         break;
 609                 default:
 610                         goto error;
 611                 }
 612                 break;
 613         case ClearPortFeature:
 614                 if (!wIndex || wIndex > ports)
 615                         goto error;
 616                 wIndex--;
 617
 618                 switch (wValue) {
 619                 case USB_PORT_FEAT_ENABLE:
 620                         temp = RH_PS_CCS;
 621                         break;
 622                 case USB_PORT_FEAT_C_ENABLE:
 623                         temp = RH_PS_PESC;
 624                         break;
 625                 case USB_PORT_FEAT_SUSPEND:
 626                         temp = RH_PS_POCI;
 627                         break;
 628                 case USB_PORT_FEAT_C_SUSPEND:
 629                         temp = RH_PS_PSSC;
 630                         break;
 631                 case USB_PORT_FEAT_POWER:
 632                         temp = RH_PS_LSDA;
 633                         break;
 634                 case USB_PORT_FEAT_C_CONNECTION:
 635                         temp = RH_PS_CSC;
 636                         break;
 637                 case USB_PORT_FEAT_C_OVER_CURRENT:
 638                         temp = RH_PS_OCIC;
 639                         break;
 640                 case USB_PORT_FEAT_C_RESET:
 641                         temp = RH_PS_PRSC;
 642                         break;
 643                 default:
 644                         goto error;
 645                 }
 646                 ohci_writel (ohci, temp,
 647                                 &ohci->regs->roothub.portstatus [wIndex]);
 648                 // ohci_readl (ohci, &ohci->regs->roothub.portstatus [wIndex]);
 649                 break;
 650         case GetHubDescriptor:
 651                 ohci_hub_descriptor (ohci, (struct usb_hub_descriptor *) buf);
 652                 break;
 653         case GetHubStatus:
 654                 temp = roothub_status (ohci) & ~(RH_HS_CRWE | RH_HS_DRWE);
 655                 put_unaligned(cpu_to_le32 (temp), (__le32 *) buf);
 656                 break;
 657         case GetPortStatus:
 658                 if (!wIndex || wIndex > ports)
 659                         goto error;
 660                 wIndex--;
 661                 temp = roothub_portstatus (ohci, wIndex);
 662                 put_unaligned(cpu_to_le32 (temp), (__le32 *) buf);
 663
 664 #ifndef OHCI_VERBOSE_DEBUG
 665         if (*(u16*)(buf+2))     /* only if wPortChange is interesting */
 666 #endif
 667                 dbg_port (ohci, "GetStatus", wIndex, temp);
 668                 break;
 669         case SetHubFeature:
 670                 switch (wValue) {
 671                 case C_HUB_OVER_CURRENT:
 672                         // FIXME:  this can be cleared, yes?
 673                 case C_HUB_LOCAL_POWER:
 674                         break;
 675                 default:
 676                         goto error;
 677                 }
 678                 break;
 679         case SetPortFeature:
 680                 if (!wIndex || wIndex > ports)
 681                         goto error;
 682                 wIndex--;
 683                 switch (wValue) {
 684                 case USB_PORT_FEAT_SUSPEND:
 685 #ifdef  CONFIG_USB_OTG
 686                         if (hcd->self.otg_port == (wIndex + 1)
 687                                         && hcd->self.b_hnp_enable)
 688                                 start_hnp(ohci);
 689                         else
 690 #endif
 691                         ohci_writel (ohci, RH_PS_PSS,
 692                                 &ohci->regs->roothub.portstatus [wIndex]);
 693                         break;
 694                 case USB_PORT_FEAT_POWER:
 695                         ohci_writel (ohci, RH_PS_PPS,
 696                                 &ohci->regs->roothub.portstatus [wIndex]);
 697                         break;
 698                 case USB_PORT_FEAT_RESET:
 699                         root_port_reset (ohci, wIndex);
 700                         break;
 701                 default:
 702                         goto error;
 703                 }
 704                 break;
 705
 706         default:
 707 error:
 708                 /* "protocol stall" on error */
 709                 retval = -EPIPE;
 710         }
 711         return retval;
 712 }
 713