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