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_rh_suspend (struct ohci_hcd *ohci, int autostop)
  59 __releases(ohci->lock)
  60 __acquires(ohci->lock)
  61 {
  62         int                     status = 0;
  63
  64         ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
  65         switch (ohci->hc_control & OHCI_CTRL_HCFS) {
  66         case OHCI_USB_RESUME:
  67                 ohci_dbg (ohci, "resume/suspend?\n");
  68                 ohci->hc_control &= ~OHCI_CTRL_HCFS;
  69                 ohci->hc_control |= OHCI_USB_RESET;
  70                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
  71                 (void) ohci_readl (ohci, &ohci->regs->control);
  72                 /* FALL THROUGH */
  73         case OHCI_USB_RESET:
  74                 status = -EBUSY;
  75                 ohci_dbg (ohci, "needs reinit!\n");
  76                 goto done;
  77         case OHCI_USB_SUSPEND:
  78                 if (!ohci->autostop) {
  79                         ohci_dbg (ohci, "already suspended\n");
  80                         goto done;
  81                 }
  82         }
  83         ohci_dbg (ohci, "%s root hub\n",
  84                         autostop ? "auto-stop" : "suspend");
  85
  86         /* First stop any processing */
  87         if (!autostop && (ohci->hc_control & OHCI_SCHED_ENABLES)) {
  88                 ohci->hc_control &= ~OHCI_SCHED_ENABLES;
  89                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
  90                 ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
  91                 ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrstatus);
  92
  93                 /* sched disables take effect on the next frame,
  94                  * then the last WDH could take 6+ msec
  95                  */
  96                 ohci_dbg (ohci, "stopping schedules ...\n");
  97                 ohci->autostop = 0;
  98                 spin_unlock_irq (&ohci->lock);
  99                 msleep (8);
 100                 spin_lock_irq (&ohci->lock);
 101         }
 102         dl_done_list (ohci);
 103         finish_unlinks (ohci, ohci_frame_no(ohci));
 104
 105         /* maybe resume can wake root hub */
 106         if (device_may_wakeup(&ohci_to_hcd(ohci)->self.root_hub->dev) ||
 107                         autostop)
 108                 ohci->hc_control |= OHCI_CTRL_RWE;
 109         else {
 110                 ohci_writel (ohci, OHCI_INTR_RHSC, &ohci->regs->intrdisable);
 111                 ohci->hc_control &= ~OHCI_CTRL_RWE;
 112         }
 113
 114         /* Suspend hub ... this is the "global (to this bus) suspend" mode,
 115          * which doesn't imply ports will first be individually suspended.
 116          */
 117         ohci->hc_control &= ~OHCI_CTRL_HCFS;
 118         ohci->hc_control |= OHCI_USB_SUSPEND;
 119         ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 120         (void) ohci_readl (ohci, &ohci->regs->control);
 121
 122         /* no resumes until devices finish suspending */
 123         if (!autostop) {
 124                 ohci->next_statechange = jiffies + msecs_to_jiffies (5);
 125                 ohci->autostop = 0;
 126         }
 127
 128 done:
 129         return status;
 130 }
 131
 132 static inline struct ed *find_head (struct ed *ed)
 133 {
 134         /* for bulk and control lists */
 135         while (ed->ed_prev)
 136                 ed = ed->ed_prev;
 137         return ed;
 138 }
 139
 140 /* caller has locked the root hub */
 141 static int ohci_rh_resume (struct ohci_hcd *ohci)
 142 __releases(ohci->lock)
 143 __acquires(ohci->lock)
 144 {
 145         struct usb_hcd          *hcd = ohci_to_hcd (ohci);
 146         u32                     temp, enables;
 147         int                     status = -EINPROGRESS;
 148         int                     autostopped = ohci->autostop;
 149
 150         ohci->autostop = 0;
 151         ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
 152
 153         if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) {
 154                 /* this can happen after resuming a swsusp snapshot */
 155                 if (hcd->state == HC_STATE_RESUMING) {
 156                         ohci_dbg (ohci, "BIOS/SMM active, control %03x\n",
 157                                         ohci->hc_control);
 158                         status = -EBUSY;
 159                 /* this happens when pmcore resumes HC then root */
 160                 } else {
 161                         ohci_dbg (ohci, "duplicate resume\n");
 162                         status = 0;
 163                 }
 164         } else switch (ohci->hc_control & OHCI_CTRL_HCFS) {
 165         case OHCI_USB_SUSPEND:
 166                 ohci->hc_control &= ~(OHCI_CTRL_HCFS|OHCI_SCHED_ENABLES);
 167                 ohci->hc_control |= OHCI_USB_RESUME;
 168                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 169                 (void) ohci_readl (ohci, &ohci->regs->control);
 170                 ohci_dbg (ohci, "%s root hub\n",
 171                                 autostopped ? "auto-start" : "resume");
 172                 break;
 173         case OHCI_USB_RESUME:
 174                 /* HCFS changes sometime after INTR_RD */
 175                 ohci_dbg(ohci, "%swakeup root hub\n",
 176                                 autostopped ? "auto-" : "");
 177                 break;
 178         case OHCI_USB_OPER:
 179                 /* this can happen after resuming a swsusp snapshot */
 180                 ohci_dbg (ohci, "snapshot resume? reinit\n");
 181                 status = -EBUSY;
 182                 break;
 183         default:                /* RESET, we lost power */
 184                 ohci_dbg (ohci, "lost power\n");
 185                 status = -EBUSY;
 186         }
 187         if (status == -EBUSY) {
 188                 if (!autostopped) {
 189                         spin_unlock_irq (&ohci->lock);
 190                         (void) ohci_init (ohci);
 191                         status = ohci_restart (ohci);
 192
 193                         usb_root_hub_lost_power(hcd->self.root_hub);
 194
 195                         spin_lock_irq (&ohci->lock);
 196                 }
 197                 return status;
 198         }
 199         if (status != -EINPROGRESS)
 200                 return status;
 201         if (autostopped)
 202                 goto skip_resume;
 203         spin_unlock_irq (&ohci->lock);
 204
 205         /* Some controllers (lucent erratum) need extra-long delays */
 206         msleep (20 /* usb 11.5.1.10 */ + 12 /* 32 msec counter */ + 1);
 207
 208         temp = ohci_readl (ohci, &ohci->regs->control);
 209         temp &= OHCI_CTRL_HCFS;
 210         if (temp != OHCI_USB_RESUME) {
 211                 ohci_err (ohci, "controller won't resume\n");
 212                 spin_lock_irq(&ohci->lock);
 213                 return -EBUSY;
 214         }
 215
 216         /* disable old schedule state, reinit from scratch */
 217         ohci_writel (ohci, 0, &ohci->regs->ed_controlhead);
 218         ohci_writel (ohci, 0, &ohci->regs->ed_controlcurrent);
 219         ohci_writel (ohci, 0, &ohci->regs->ed_bulkhead);
 220         ohci_writel (ohci, 0, &ohci->regs->ed_bulkcurrent);
 221         ohci_writel (ohci, 0, &ohci->regs->ed_periodcurrent);
 222         ohci_writel (ohci, (u32) ohci->hcca_dma, &ohci->regs->hcca);
 223
 224         /* Sometimes PCI D3 suspend trashes frame timings ... */
 225         periodic_reinit (ohci);
 226
 227         /* the following code is executed with ohci->lock held and
 228          * irqs disabled if and only if autostopped is true
 229          */
 230
 231 skip_resume:
 232         /* interrupts might have been disabled */
 233         ohci_writel (ohci, OHCI_INTR_INIT, &ohci->regs->intrenable);
 234         if (ohci->ed_rm_list)
 235                 ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrenable);
 236
 237         /* Then re-enable operations */
 238         ohci_writel (ohci, OHCI_USB_OPER, &ohci->regs->control);
 239         (void) ohci_readl (ohci, &ohci->regs->control);
 240         if (!autostopped)
 241                 msleep (3);
 242
 243         temp = ohci->hc_control;
 244         temp &= OHCI_CTRL_RWC;
 245         temp |= OHCI_CONTROL_INIT | OHCI_USB_OPER;
 246         ohci->hc_control = temp;
 247         ohci_writel (ohci, temp, &ohci->regs->control);
 248         (void) ohci_readl (ohci, &ohci->regs->control);
 249
 250         /* TRSMRCY */
 251         if (!autostopped) {
 252                 msleep (10);
 253                 spin_lock_irq (&ohci->lock);
 254         }
 255         /* now ohci->lock is always held and irqs are always disabled */
 256
 257         /* keep it alive for more than ~5x suspend + resume costs */
 258         ohci->next_statechange = jiffies + STATECHANGE_DELAY;
 259
 260         /* maybe turn schedules back on */
 261         enables = 0;
 262         temp = 0;
 263         if (!ohci->ed_rm_list) {
 264                 if (ohci->ed_controltail) {
 265                         ohci_writel (ohci,
 266                                         find_head (ohci->ed_controltail)->dma,
 267                                         &ohci->regs->ed_controlhead);
 268                         enables |= OHCI_CTRL_CLE;
 269                         temp |= OHCI_CLF;
 270                 }
 271                 if (ohci->ed_bulktail) {
 272                         ohci_writel (ohci, find_head (ohci->ed_bulktail)->dma,
 273                                 &ohci->regs->ed_bulkhead);
 274                         enables |= OHCI_CTRL_BLE;
 275                         temp |= OHCI_BLF;
 276                 }
 277         }
 278         if (hcd->self.bandwidth_isoc_reqs || hcd->self.bandwidth_int_reqs)
 279                 enables |= OHCI_CTRL_PLE|OHCI_CTRL_IE;
 280         if (enables) {
 281                 ohci_dbg (ohci, "restarting schedules ... %08x\n", enables);
 282                 ohci->hc_control |= enables;
 283                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 284                 if (temp)
 285                         ohci_writel (ohci, temp, &ohci->regs->cmdstatus);
 286                 (void) ohci_readl (ohci, &ohci->regs->control);
 287         }
 288
 289         return 0;
 290 }
 291
 292 static int ohci_bus_suspend (struct usb_hcd *hcd)
 293 {
 294         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
 295         int                     rc;
 296
 297         spin_lock_irq (&ohci->lock);
 298
 299         if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
 300                 rc = -ESHUTDOWN;
 301         else
 302                 rc = ohci_rh_suspend (ohci, 0);
 303         spin_unlock_irq (&ohci->lock);
 304         return rc;
 305 }
 306
 307 static int ohci_bus_resume (struct usb_hcd *hcd)
 308 {
 309         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
 310         int                     rc;
 311
 312         if (time_before (jiffies, ohci->next_statechange))
 313                 msleep(5);
 314
 315         spin_lock_irq (&ohci->lock);
 316
 317         if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
 318                 rc = -ESHUTDOWN;
 319         else
 320                 rc = ohci_rh_resume (ohci);
 321         spin_unlock_irq (&ohci->lock);
 322
 323         /* poll until we know a device is connected or we autostop */
 324         if (rc == 0)
 325                 usb_hcd_poll_rh_status(hcd);
 326         return rc;
 327 }
 328
 329 /* Carry out polling-, autostop-, and autoresume-related state changes */
 330 static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
 331                 int any_connected)
 332 {
 333         int     poll_rh = 1;
 334
 335         switch (ohci->hc_control & OHCI_CTRL_HCFS) {
 336
 337         case OHCI_USB_OPER:
 338                 /* keep on polling until we know a device is connected
 339                  * and RHSC is enabled */
 340                 if (!ohci->autostop) {
 341                         if (any_connected ||
 342                                         !device_may_wakeup(&ohci_to_hcd(ohci)
 343                                                 ->self.root_hub->dev)) {
 344                                 if (ohci_readl(ohci, &ohci->regs->intrenable) &
 345                                                 OHCI_INTR_RHSC)
 346                                         poll_rh = 0;
 347                         } else {
 348                                 ohci->autostop = 1;
 349                                 ohci->next_statechange = jiffies + HZ;
 350                         }
 351
 352                 /* if no devices have been attached for one second, autostop */
 353                 } else {
 354                         if (changed || any_connected) {
 355                                 ohci->autostop = 0;
 356                                 ohci->next_statechange = jiffies +
 357                                                 STATECHANGE_DELAY;
 358                         } else if (time_after_eq(jiffies,
 359                                                 ohci->next_statechange)
 360                                         && !ohci->ed_rm_list
 361                                         && !(ohci->hc_control &
 362                                                 OHCI_SCHED_ENABLES)) {
 363                                 ohci_rh_suspend(ohci, 1);
 364                         }
 365                 }
 366                 break;
 367
 368         /* if there is a port change, autostart or ask to be resumed */
 369         case OHCI_USB_SUSPEND:
 370         case OHCI_USB_RESUME:
 371                 if (changed) {
 372                         if (ohci->autostop)
 373                                 ohci_rh_resume(ohci);
 374                         else
 375                                 usb_hcd_resume_root_hub(ohci_to_hcd(ohci));
 376                 } else {
 377                         /* everything is idle, no need for polling */
 378                         poll_rh = 0;
 379                 }
 380                 break;
 381         }
 382         return poll_rh;
 383 }
 384
 385 #else   /* CONFIG_PM */
 386
 387 static inline int ohci_rh_resume(struct ohci_hcd *ohci)
 388 {
 389         return 0;
 390 }
 391
 392 /* Carry out polling-related state changes.
 393  * autostop isn't used when CONFIG_PM is turned off.
 394  */
 395 static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
 396                 int any_connected)
 397 {
 398         int     poll_rh = 1;
 399
 400         /* keep on polling until RHSC is enabled */
 401         if (ohci_readl(ohci, &ohci->regs->intrenable) & OHCI_INTR_RHSC)
 402                 poll_rh = 0;
 403         return poll_rh;
 404 }
 405
 406 #endif  /* CONFIG_PM */
 407
 408 /*-------------------------------------------------------------------------*/
 409
 410 /* build "status change" packet (one or two bytes) from HC registers */
 411
 412 static int
 413 ohci_hub_status_data (struct usb_hcd *hcd, char *buf)
 414 {
 415         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 416         int             i, changed = 0, length = 1;
 417         int             any_connected = 0;
 418         unsigned long   flags;
 419
 420         spin_lock_irqsave (&ohci->lock, flags);
 421         if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))
 422                 goto done;
 423
 424         /* undocumented erratum seen on at least rev D */
 425         if ((ohci->flags & OHCI_QUIRK_AMD756)
 426                         && (roothub_a (ohci) & RH_A_NDP) > MAX_ROOT_PORTS) {
 427                 ohci_warn (ohci, "bogus NDP, rereads as NDP=%d\n",
 428                           ohci_readl (ohci, &ohci->regs->roothub.a) & RH_A_NDP);
 429                 /* retry later; "should not happen" */
 430                 goto done;
 431         }
 432
 433         /* init status */
 434         if (roothub_status (ohci) & (RH_HS_LPSC | RH_HS_OCIC))
 435                 buf [0] = changed = 1;
 436         else
 437                 buf [0] = 0;
 438         if (ohci->num_ports > 7) {
 439                 buf [1] = 0;
 440                 length++;
 441         }
 442
 443         /* look at each port */
 444         for (i = 0; i < ohci->num_ports; i++) {
 445                 u32     status = roothub_portstatus (ohci, i);
 446
 447                 /* can't autostop if ports are connected */
 448                 any_connected |= (status & RH_PS_CCS);
 449
 450                 if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC
 451                                 | RH_PS_OCIC | RH_PS_PRSC)) {
 452                         changed = 1;
 453                         if (i < 7)
 454                             buf [0] |= 1 << (i + 1);
 455                         else
 456                             buf [1] |= 1 << (i - 7);
 457                 }
 458         }
 459
 460         hcd->poll_rh = ohci_root_hub_state_changes(ohci, changed,
 461                         any_connected);
 462
 463 done:
 464         spin_unlock_irqrestore (&ohci->lock, flags);
 465
 466         return changed ? length : 0;
 467 }
 468
 469 /*-------------------------------------------------------------------------*/
 470
 471 static void
 472 ohci_hub_descriptor (
 473         struct ohci_hcd                 *ohci,
 474         struct usb_hub_descriptor       *desc
 475 ) {
 476         u32             rh = roothub_a (ohci);
 477         u16             temp;
 478
 479         desc->bDescriptorType = 0x29;
 480         desc->bPwrOn2PwrGood = (rh & RH_A_POTPGT) >> 24;
 481         desc->bHubContrCurrent = 0;
 482
 483         desc->bNbrPorts = ohci->num_ports;
 484         temp = 1 + (ohci->num_ports / 8);
 485         desc->bDescLength = 7 + 2 * temp;
 486
 487         temp = 0;
 488         if (rh & RH_A_NPS)              /* no power switching? */
 489             temp |= 0x0002;
 490         if (rh & RH_A_PSM)              /* per-port power switching? */
 491             temp |= 0x0001;
 492         if (rh & RH_A_NOCP)             /* no overcurrent reporting? */
 493             temp |= 0x0010;
 494         else if (rh & RH_A_OCPM)        /* per-port overcurrent reporting? */
 495             temp |= 0x0008;
 496         desc->wHubCharacteristics = (__force __u16)cpu_to_hc16(ohci, temp);
 497
 498         /* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
 499         rh = roothub_b (ohci);
 500         memset(desc->bitmap, 0xff, sizeof(desc->bitmap));
 501         desc->bitmap [0] = rh & RH_B_DR;
 502         if (ohci->num_ports > 7) {
 503                 desc->bitmap [1] = (rh & RH_B_DR) >> 8;
 504                 desc->bitmap [2] = 0xff;
 505         } else
 506                 desc->bitmap [1] = 0xff;
 507 }
 508
 509 /*-------------------------------------------------------------------------*/
 510
 511 #ifdef  CONFIG_USB_OTG
 512
 513 static int ohci_start_port_reset (struct usb_hcd *hcd, unsigned port)
 514 {
 515         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 516         u32                     status;
 517
 518         if (!port)
 519                 return -EINVAL;
 520         port--;
 521
 522         /* start port reset before HNP protocol times out */
 523         status = ohci_readl(ohci, &ohci->regs->roothub.portstatus [port]);
 524         if (!(status & RH_PS_CCS))
 525                 return -ENODEV;
 526
 527         /* khubd will finish the reset later */
 528         ohci_writel(ohci, RH_PS_PRS, &ohci->regs->roothub.portstatus [port]);
 529         return 0;
 530 }
 531
 532 static void start_hnp(struct ohci_hcd *ohci);
 533
 534 #else
 535
 536 #define ohci_start_port_reset           NULL
 537
 538 #endif
 539
 540 /*-------------------------------------------------------------------------*/
 541
 542
 543 /* See usb 7.1.7.5:  root hubs must issue at least 50 msec reset signaling,
 544  * not necessarily continuous ... to guard against resume signaling.
 545  * The short timeout is safe for non-root hubs, and is backward-compatible
 546  * with earlier Linux hosts.
 547  */
 548 #ifdef  CONFIG_USB_SUSPEND
 549 #define PORT_RESET_MSEC         50
 550 #else
 551 #define PORT_RESET_MSEC         10
 552 #endif
 553
 554 /* this timer value might be vendor-specific ... */
 555 #define PORT_RESET_HW_MSEC      10
 556
 557 /* wrap-aware logic morphed from <linux/jiffies.h> */
 558 #define tick_before(t1,t2) ((s16)(((s16)(t1))-((s16)(t2))) < 0)
 559
 560 /* called from some task, normally khubd */
 561 static inline int root_port_reset (struct ohci_hcd *ohci, unsigned port)
 562 {
 563         __hc32 __iomem *portstat = &ohci->regs->roothub.portstatus [port];
 564         u32     temp;
 565         u16     now = ohci_readl(ohci, &ohci->regs->fmnumber);
 566         u16     reset_done = now + PORT_RESET_MSEC;
 567         int     limit_1 = DIV_ROUND_UP(PORT_RESET_MSEC, PORT_RESET_HW_MSEC);
 568
 569         /* build a "continuous enough" reset signal, with up to
 570          * 3msec gap between pulses.  scheduler HZ==100 must work;
 571          * this might need to be deadline-scheduled.
 572          */
 573         do {
 574                 int limit_2;
 575
 576                 /* spin until any current reset finishes */
 577                 limit_2 = PORT_RESET_HW_MSEC * 2;
 578                 while (--limit_2 >= 0) {
 579                         temp = ohci_readl (ohci, portstat);
 580                         /* handle e.g. CardBus eject */
 581                         if (temp == ~(u32)0)
 582                                 return -ESHUTDOWN;
 583                         if (!(temp & RH_PS_PRS))
 584                                 break;
 585                         udelay (500);
 586                 }
 587
 588                 /* timeout (a hardware error) has been observed when
 589                  * EHCI sets CF while this driver is resetting a port;
 590                  * presumably other disconnect paths might do it too.
 591                  */
 592                 if (limit_2 < 0) {
 593                         ohci_dbg(ohci,
 594                                 "port[%d] reset timeout, stat %08x\n",
 595                                 port, temp);
 596                         break;
 597                 }
 598
 599                 if (!(temp & RH_PS_CCS))
 600                         break;
 601                 if (temp & RH_PS_PRSC)
 602                         ohci_writel (ohci, RH_PS_PRSC, portstat);
 603
 604                 /* start the next reset, sleep till it's probably done */
 605                 ohci_writel (ohci, RH_PS_PRS, portstat);
 606                 msleep(PORT_RESET_HW_MSEC);
 607                 now = ohci_readl(ohci, &ohci->regs->fmnumber);
 608         } while (tick_before(now, reset_done) && --limit_1 >= 0);
 609
 610         /* caller synchronizes using PRSC ... and handles PRS
 611          * still being set when this returns.
 612          */
 613
 614         return 0;
 615 }
 616
 617 static int ohci_hub_control (
 618         struct usb_hcd  *hcd,
 619         u16             typeReq,
 620         u16             wValue,
 621         u16             wIndex,
 622         char            *buf,
 623         u16             wLength
 624 ) {
 625         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 626         int             ports = hcd_to_bus (hcd)->root_hub->maxchild;
 627         u32             temp;
 628         int             retval = 0;
 629
 630         if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
 631                 return -ESHUTDOWN;
 632
 633         switch (typeReq) {
 634         case ClearHubFeature:
 635                 switch (wValue) {
 636                 case C_HUB_OVER_CURRENT:
 637                         ohci_writel (ohci, RH_HS_OCIC,
 638                                         &ohci->regs->roothub.status);
 639                 case C_HUB_LOCAL_POWER:
 640                         break;
 641                 default:
 642                         goto error;
 643                 }
 644                 break;
 645         case ClearPortFeature:
 646                 if (!wIndex || wIndex > ports)
 647                         goto error;
 648                 wIndex--;
 649
 650                 switch (wValue) {
 651                 case USB_PORT_FEAT_ENABLE:
 652                         temp = RH_PS_CCS;
 653                         break;
 654                 case USB_PORT_FEAT_C_ENABLE:
 655                         temp = RH_PS_PESC;
 656                         break;
 657                 case USB_PORT_FEAT_SUSPEND:
 658                         temp = RH_PS_POCI;
 659                         break;
 660                 case USB_PORT_FEAT_C_SUSPEND:
 661                         temp = RH_PS_PSSC;
 662                         break;
 663                 case USB_PORT_FEAT_POWER:
 664                         temp = RH_PS_LSDA;
 665                         break;
 666                 case USB_PORT_FEAT_C_CONNECTION:
 667                         temp = RH_PS_CSC;
 668                         break;
 669                 case USB_PORT_FEAT_C_OVER_CURRENT:
 670                         temp = RH_PS_OCIC;
 671                         break;
 672                 case USB_PORT_FEAT_C_RESET:
 673                         temp = RH_PS_PRSC;
 674                         break;
 675                 default:
 676                         goto error;
 677                 }
 678                 ohci_writel (ohci, temp,
 679                                 &ohci->regs->roothub.portstatus [wIndex]);
 680                 // ohci_readl (ohci, &ohci->regs->roothub.portstatus [wIndex]);
 681                 break;
 682         case GetHubDescriptor:
 683                 ohci_hub_descriptor (ohci, (struct usb_hub_descriptor *) buf);
 684                 break;
 685         case GetHubStatus:
 686                 temp = roothub_status (ohci) & ~(RH_HS_CRWE | RH_HS_DRWE);
 687                 put_unaligned(cpu_to_le32 (temp), (__le32 *) buf);
 688                 break;
 689         case GetPortStatus:
 690                 if (!wIndex || wIndex > ports)
 691                         goto error;
 692                 wIndex--;
 693                 temp = roothub_portstatus (ohci, wIndex);
 694                 put_unaligned(cpu_to_le32 (temp), (__le32 *) buf);
 695
 696 #ifndef OHCI_VERBOSE_DEBUG
 697         if (*(u16*)(buf+2))     /* only if wPortChange is interesting */
 698 #endif
 699                 dbg_port (ohci, "GetStatus", wIndex, temp);
 700                 break;
 701         case SetHubFeature:
 702                 switch (wValue) {
 703                 case C_HUB_OVER_CURRENT:
 704                         // FIXME:  this can be cleared, yes?
 705                 case C_HUB_LOCAL_POWER:
 706                         break;
 707                 default:
 708                         goto error;
 709                 }
 710                 break;
 711         case SetPortFeature:
 712                 if (!wIndex || wIndex > ports)
 713                         goto error;
 714                 wIndex--;
 715                 switch (wValue) {
 716                 case USB_PORT_FEAT_SUSPEND:
 717 #ifdef  CONFIG_USB_OTG
 718                         if (hcd->self.otg_port == (wIndex + 1)
 719                                         && hcd->self.b_hnp_enable)
 720                                 start_hnp(ohci);
 721                         else
 722 #endif
 723                         ohci_writel (ohci, RH_PS_PSS,
 724                                 &ohci->regs->roothub.portstatus [wIndex]);
 725                         break;
 726                 case USB_PORT_FEAT_POWER:
 727                         ohci_writel (ohci, RH_PS_PPS,
 728                                 &ohci->regs->roothub.portstatus [wIndex]);
 729                         break;
 730                 case USB_PORT_FEAT_RESET:
 731                         retval = root_port_reset (ohci, wIndex);
 732                         break;
 733                 default:
 734                         goto error;
 735                 }
 736                 break;
 737
 738         default:
 739 error:
 740                 /* "protocol stall" on error */
 741                 retval = -EPIPE;
 742         }
 743         return retval;
 744 }
 745