drivers/usb/host/ohci-hcd.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  * [ Initialisation is based on Linus'  ]
   8  * [ uhci code and gregs ohci fragments ]
   9  * [ (C) Copyright 1999 Linus Torvalds  ]
  10  * [ (C) Copyright 1999 Gregory P. Smith]
  11  *
  12  *
  13  * OHCI is the main "non-Intel/VIA" standard for USB 1.1 host controller
  14  * interfaces (though some non-x86 Intel chips use it).  It supports
  15  * smarter hardware than UHCI.  A download link for the spec available
  16  * through the http://www.usb.org website.
  17  *
  18  * This file is licenced under the GPL.
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/moduleparam.h>
  23 #include <linux/pci.h>
  24 #include <linux/kernel.h>
  25 #include <linux/delay.h>
  26 #include <linux/ioport.h>
  27 #include <linux/sched.h>
  28 #include <linux/slab.h>
  29 #include <linux/errno.h>
  30 #include <linux/init.h>
  31 #include <linux/timer.h>
  32 #include <linux/list.h>
  33 #include <linux/usb.h>
  34 #include <linux/usb/otg.h>
  35 #include <linux/dma-mapping.h>
  36 #include <linux/dmapool.h>
  37 #include <linux/reboot.h>
  38 #include <linux/workqueue.h>
  39 #include <linux/debugfs.h>
  40
  41 #include <asm/io.h>
  42 #include <asm/irq.h>
  43 #include <asm/system.h>
  44 #include <asm/unaligned.h>
  45 #include <asm/byteorder.h>
  46
  47 #include "../core/hcd.h"
  48
  49 #define DRIVER_VERSION "2006 August 04"
  50 #define DRIVER_AUTHOR "Roman Weissgaerber, David Brownell"
  51 #define DRIVER_DESC "USB 1.1 'Open' Host Controller (OHCI) Driver"
  52
  53 /*-------------------------------------------------------------------------*/
  54
  55 #undef OHCI_VERBOSE_DEBUG       /* not always helpful */
  56
  57 /* For initializing controller (mask in an HCFS mode too) */
  58 #define OHCI_CONTROL_INIT       OHCI_CTRL_CBSR
  59 #define OHCI_INTR_INIT \
  60                 (OHCI_INTR_MIE | OHCI_INTR_RHSC | OHCI_INTR_UE \
  61                 | OHCI_INTR_RD | OHCI_INTR_WDH)
  62
  63 #ifdef __hppa__
  64 /* On PA-RISC, PDC can leave IR set incorrectly; ignore it there. */
  65 #define IR_DISABLE
  66 #endif
  67
  68 #ifdef CONFIG_ARCH_OMAP
  69 /* OMAP doesn't support IR (no SMM; not needed) */
  70 #define IR_DISABLE
  71 #endif
  72
  73 /*-------------------------------------------------------------------------*/
  74
  75 static const char       hcd_name [] = "ohci_hcd";
  76
  77 #define STATECHANGE_DELAY       msecs_to_jiffies(300)
  78
  79 #include "ohci.h"
  80
  81 static void ohci_dump (struct ohci_hcd *ohci, int verbose);
  82 static int ohci_init (struct ohci_hcd *ohci);
  83 static void ohci_stop (struct usb_hcd *hcd);
  84
  85 #if defined(CONFIG_PM) || defined(CONFIG_PCI)
  86 static int ohci_restart (struct ohci_hcd *ohci);
  87 #endif
  88
  89 #ifdef CONFIG_PCI
  90 static void quirk_amd_pll(int state);
  91 static void amd_iso_dev_put(void);
  92 #else
  93 static inline void quirk_amd_pll(int state)
  94 {
  95         return;
  96 }
  97 static inline void amd_iso_dev_put(void)
  98 {
  99         return;
 100 }
 101 #endif
 102
 103
 104 #include "ohci-hub.c"
 105 #include "ohci-dbg.c"
 106 #include "ohci-mem.c"
 107 #include "ohci-q.c"
 108
 109
 110 /*
 111  * On architectures with edge-triggered interrupts we must never return
 112  * IRQ_NONE.
 113  */
 114 #if defined(CONFIG_SA1111)  /* ... or other edge-triggered systems */
 115 #define IRQ_NOTMINE     IRQ_HANDLED
 116 #else
 117 #define IRQ_NOTMINE     IRQ_NONE
 118 #endif
 119
 120
 121 /* Some boards misreport power switching/overcurrent */
 122 static int distrust_firmware = 1;
 123 module_param (distrust_firmware, bool, 0);
 124 MODULE_PARM_DESC (distrust_firmware,
 125         "true to distrust firmware power/overcurrent setup");
 126
 127 /* Some boards leave IR set wrongly, since they fail BIOS/SMM handshakes */
 128 static int no_handshake = 0;
 129 module_param (no_handshake, bool, 0);
 130 MODULE_PARM_DESC (no_handshake, "true (not default) disables BIOS handshake");
 131
 132 /*-------------------------------------------------------------------------*/
 133
 134 /*
 135  * queue up an urb for anything except the root hub
 136  */
 137 static int ohci_urb_enqueue (
 138         struct usb_hcd  *hcd,
 139         struct urb      *urb,
 140         gfp_t           mem_flags
 141 ) {
 142         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 143         struct ed       *ed;
 144         urb_priv_t      *urb_priv;
 145         unsigned int    pipe = urb->pipe;
 146         int             i, size = 0;
 147         unsigned long   flags;
 148         int             retval = 0;
 149
 150 #ifdef OHCI_VERBOSE_DEBUG
 151         urb_print(urb, "SUB", usb_pipein(pipe), -EINPROGRESS);
 152 #endif
 153
 154         /* every endpoint has a ed, locate and maybe (re)initialize it */
 155         if (! (ed = ed_get (ohci, urb->ep, urb->dev, pipe, urb->interval)))
 156                 return -ENOMEM;
 157
 158         /* for the private part of the URB we need the number of TDs (size) */
 159         switch (ed->type) {
 160                 case PIPE_CONTROL:
 161                         /* td_submit_urb() doesn't yet handle these */
 162                         if (urb->transfer_buffer_length > 4096)
 163                                 return -EMSGSIZE;
 164
 165                         /* 1 TD for setup, 1 for ACK, plus ... */
 166                         size = 2;
 167                         /* FALLTHROUGH */
 168                 // case PIPE_INTERRUPT:
 169                 // case PIPE_BULK:
 170                 default:
 171                         /* one TD for every 4096 Bytes (can be upto 8K) */
 172                         size += urb->transfer_buffer_length / 4096;
 173                         /* ... and for any remaining bytes ... */
 174                         if ((urb->transfer_buffer_length % 4096) != 0)
 175                                 size++;
 176                         /* ... and maybe a zero length packet to wrap it up */
 177                         if (size == 0)
 178                                 size++;
 179                         else if ((urb->transfer_flags & URB_ZERO_PACKET) != 0
 180                                 && (urb->transfer_buffer_length
 181                                         % usb_maxpacket (urb->dev, pipe,
 182                                                 usb_pipeout (pipe))) == 0)
 183                                 size++;
 184                         break;
 185                 case PIPE_ISOCHRONOUS: /* number of packets from URB */
 186                         size = urb->number_of_packets;
 187                         break;
 188         }
 189
 190         /* allocate the private part of the URB */
 191         urb_priv = kzalloc (sizeof (urb_priv_t) + size * sizeof (struct td *),
 192                         mem_flags);
 193         if (!urb_priv)
 194                 return -ENOMEM;
 195         INIT_LIST_HEAD (&urb_priv->pending);
 196         urb_priv->length = size;
 197         urb_priv->ed = ed;
 198
 199         /* allocate the TDs (deferring hash chain updates) */
 200         for (i = 0; i < size; i++) {
 201                 urb_priv->td [i] = td_alloc (ohci, mem_flags);
 202                 if (!urb_priv->td [i]) {
 203                         urb_priv->length = i;
 204                         urb_free_priv (ohci, urb_priv);
 205                         return -ENOMEM;
 206                 }
 207         }
 208
 209         spin_lock_irqsave (&ohci->lock, flags);
 210
 211         /* don't submit to a dead HC */
 212         if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
 213                 retval = -ENODEV;
 214                 goto fail;
 215         }
 216         if (!HC_IS_RUNNING(hcd->state)) {
 217                 retval = -ENODEV;
 218                 goto fail;
 219         }
 220         retval = usb_hcd_link_urb_to_ep(hcd, urb);
 221         if (retval)
 222                 goto fail;
 223
 224         /* schedule the ed if needed */
 225         if (ed->state == ED_IDLE) {
 226                 retval = ed_schedule (ohci, ed);
 227                 if (retval < 0) {
 228                         usb_hcd_unlink_urb_from_ep(hcd, urb);
 229                         goto fail;
 230                 }
 231                 if (ed->type == PIPE_ISOCHRONOUS) {
 232                         u16     frame = ohci_frame_no(ohci);
 233
 234                         /* delay a few frames before the first TD */
 235                         frame += max_t (u16, 8, ed->interval);
 236                         frame &= ~(ed->interval - 1);
 237                         frame |= ed->branch;
 238                         urb->start_frame = frame;
 239
 240                         /* yes, only URB_ISO_ASAP is supported, and
 241                          * urb->start_frame is never used as input.
 242                          */
 243                 }
 244         } else if (ed->type == PIPE_ISOCHRONOUS)
 245                 urb->start_frame = ed->last_iso + ed->interval;
 246
 247         /* fill the TDs and link them to the ed; and
 248          * enable that part of the schedule, if needed
 249          * and update count of queued periodic urbs
 250          */
 251         urb->hcpriv = urb_priv;
 252         td_submit_urb (ohci, urb);
 253
 254 fail:
 255         if (retval)
 256                 urb_free_priv (ohci, urb_priv);
 257         spin_unlock_irqrestore (&ohci->lock, flags);
 258         return retval;
 259 }
 260
 261 /*
 262  * decouple the URB from the HC queues (TDs, urb_priv).
 263  * reporting is always done
 264  * asynchronously, and we might be dealing with an urb that's
 265  * partially transferred, or an ED with other urbs being unlinked.
 266  */
 267 static int ohci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
 268 {
 269         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
 270         unsigned long           flags;
 271         int                     rc;
 272
 273 #ifdef OHCI_VERBOSE_DEBUG
 274         urb_print(urb, "UNLINK", 1, status);
 275 #endif
 276
 277         spin_lock_irqsave (&ohci->lock, flags);
 278         rc = usb_hcd_check_unlink_urb(hcd, urb, status);
 279         if (rc) {
 280                 ;       /* Do nothing */
 281         } else if (HC_IS_RUNNING(hcd->state)) {
 282                 urb_priv_t  *urb_priv;
 283
 284                 /* Unless an IRQ completed the unlink while it was being
 285                  * handed to us, flag it for unlink and giveback, and force
 286                  * some upcoming INTR_SF to call finish_unlinks()
 287                  */
 288                 urb_priv = urb->hcpriv;
 289                 if (urb_priv) {
 290                         if (urb_priv->ed->state == ED_OPER)
 291                                 start_ed_unlink (ohci, urb_priv->ed);
 292                 }
 293         } else {
 294                 /*
 295                  * with HC dead, we won't respect hc queue pointers
 296                  * any more ... just clean up every urb's memory.
 297                  */
 298                 if (urb->hcpriv)
 299                         finish_urb(ohci, urb, status);
 300         }
 301         spin_unlock_irqrestore (&ohci->lock, flags);
 302         return rc;
 303 }
 304
 305 /*-------------------------------------------------------------------------*/
 306
 307 /* frees config/altsetting state for endpoints,
 308  * including ED memory, dummy TD, and bulk/intr data toggle
 309  */
 310
 311 static void
 312 ohci_endpoint_disable (struct usb_hcd *hcd, struct usb_host_endpoint *ep)
 313 {
 314         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
 315         unsigned long           flags;
 316         struct ed               *ed = ep->hcpriv;
 317         unsigned                limit = 1000;
 318
 319         /* ASSERT:  any requests/urbs are being unlinked */
 320         /* ASSERT:  nobody can be submitting urbs for this any more */
 321
 322         if (!ed)
 323                 return;
 324
 325 rescan:
 326         spin_lock_irqsave (&ohci->lock, flags);
 327
 328         if (!HC_IS_RUNNING (hcd->state)) {
 329 sanitize:
 330                 ed->state = ED_IDLE;
 331                 if (quirk_zfmicro(ohci) && ed->type == PIPE_INTERRUPT)
 332                         ohci->eds_scheduled--;
 333                 finish_unlinks (ohci, 0);
 334         }
 335
 336         switch (ed->state) {
 337         case ED_UNLINK:         /* wait for hw to finish? */
 338                 /* major IRQ delivery trouble loses INTR_SF too... */
 339                 if (limit-- == 0) {
 340                         ohci_warn(ohci, "ED unlink timeout\n");
 341                         if (quirk_zfmicro(ohci)) {
 342                                 ohci_warn(ohci, "Attempting ZF TD recovery\n");
 343                                 ohci->ed_to_check = ed;
 344                                 ohci->zf_delay = 2;
 345                         }
 346                         goto sanitize;
 347                 }
 348                 spin_unlock_irqrestore (&ohci->lock, flags);
 349                 schedule_timeout_uninterruptible(1);
 350                 goto rescan;
 351         case ED_IDLE:           /* fully unlinked */
 352                 if (list_empty (&ed->td_list)) {
 353                         td_free (ohci, ed->dummy);
 354                         ed_free (ohci, ed);
 355                         break;
 356                 }
 357                 /* else FALL THROUGH */
 358         default:
 359                 /* caller was supposed to have unlinked any requests;
 360                  * that's not our job.  can't recover; must leak ed.
 361                  */
 362                 ohci_err (ohci, "leak ed %p (#%02x) state %d%s\n",
 363                         ed, ep->desc.bEndpointAddress, ed->state,
 364                         list_empty (&ed->td_list) ? "" : " (has tds)");
 365                 td_free (ohci, ed->dummy);
 366                 break;
 367         }
 368         ep->hcpriv = NULL;
 369         spin_unlock_irqrestore (&ohci->lock, flags);
 370         return;
 371 }
 372
 373 static int ohci_get_frame (struct usb_hcd *hcd)
 374 {
 375         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
 376
 377         return ohci_frame_no(ohci);
 378 }
 379
 380 static void ohci_usb_reset (struct ohci_hcd *ohci)
 381 {
 382         ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
 383         ohci->hc_control &= OHCI_CTRL_RWC;
 384         ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 385 }
 386
 387 /* ohci_shutdown forcibly disables IRQs and DMA, helping kexec and
 388  * other cases where the next software may expect clean state from the
 389  * "firmware".  this is bus-neutral, unlike shutdown() methods.
 390  */
 391 static void
 392 ohci_shutdown (struct usb_hcd *hcd)
 393 {
 394         struct ohci_hcd *ohci;
 395
 396         ohci = hcd_to_ohci (hcd);
 397         ohci_writel (ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
 398         ohci_usb_reset (ohci);
 399         /* flush the writes */
 400         (void) ohci_readl (ohci, &ohci->regs->control);
 401 }
 402
 403 static int check_ed(struct ohci_hcd *ohci, struct ed *ed)
 404 {
 405         return (hc32_to_cpu(ohci, ed->hwINFO) & ED_IN) != 0
 406                 && (hc32_to_cpu(ohci, ed->hwHeadP) & TD_MASK)
 407                         == (hc32_to_cpu(ohci, ed->hwTailP) & TD_MASK)
 408                 && !list_empty(&ed->td_list);
 409 }
 410
 411 /* ZF Micro watchdog timer callback. The ZF Micro chipset sometimes completes
 412  * an interrupt TD but neglects to add it to the donelist.  On systems with
 413  * this chipset, we need to periodically check the state of the queues to look
 414  * for such "lost" TDs.
 415  */
 416 static void unlink_watchdog_func(unsigned long _ohci)
 417 {
 418         unsigned long   flags;
 419         unsigned        max;
 420         unsigned        seen_count = 0;
 421         unsigned        i;
 422         struct ed       **seen = NULL;
 423         struct ohci_hcd *ohci = (struct ohci_hcd *) _ohci;
 424
 425         spin_lock_irqsave(&ohci->lock, flags);
 426         max = ohci->eds_scheduled;
 427         if (!max)
 428                 goto done;
 429
 430         if (ohci->ed_to_check)
 431                 goto out;
 432
 433         seen = kcalloc(max, sizeof *seen, GFP_ATOMIC);
 434         if (!seen)
 435                 goto out;
 436
 437         for (i = 0; i < NUM_INTS; i++) {
 438                 struct ed       *ed = ohci->periodic[i];
 439
 440                 while (ed) {
 441                         unsigned        temp;
 442
 443                         /* scan this branch of the periodic schedule tree */
 444                         for (temp = 0; temp < seen_count; temp++) {
 445                                 if (seen[temp] == ed) {
 446                                         /* we've checked it and what's after */
 447                                         ed = NULL;
 448                                         break;
 449                                 }
 450                         }
 451                         if (!ed)
 452                                 break;
 453                         seen[seen_count++] = ed;
 454                         if (!check_ed(ohci, ed)) {
 455                                 ed = ed->ed_next;
 456                                 continue;
 457                         }
 458
 459                         /* HC's TD list is empty, but HCD sees at least one
 460                          * TD that's not been sent through the donelist.
 461                          */
 462                         ohci->ed_to_check = ed;
 463                         ohci->zf_delay = 2;
 464
 465                         /* The HC may wait until the next frame to report the
 466                          * TD as done through the donelist and INTR_WDH.  (We
 467                          * just *assume* it's not a multi-TD interrupt URB;
 468                          * those could defer the IRQ more than one frame, using
 469                          * DI...)  Check again after the next INTR_SF.
 470                          */
 471                         ohci_writel(ohci, OHCI_INTR_SF,
 472                                         &ohci->regs->intrstatus);
 473                         ohci_writel(ohci, OHCI_INTR_SF,
 474                                         &ohci->regs->intrenable);
 475
 476                         /* flush those writes */
 477                         (void) ohci_readl(ohci, &ohci->regs->control);
 478
 479                         goto out;
 480                 }
 481         }
 482 out:
 483         kfree(seen);
 484         if (ohci->eds_scheduled)
 485                 mod_timer(&ohci->unlink_watchdog, round_jiffies(jiffies + HZ));
 486 done:
 487         spin_unlock_irqrestore(&ohci->lock, flags);
 488 }
 489
 490 /*-------------------------------------------------------------------------*
 491  * HC functions
 492  *-------------------------------------------------------------------------*/
 493
 494 /* init memory, and kick BIOS/SMM off */
 495
 496 static int ohci_init (struct ohci_hcd *ohci)
 497 {
 498         int ret;
 499         struct usb_hcd *hcd = ohci_to_hcd(ohci);
 500
 501         if (distrust_firmware)
 502                 ohci->flags |= OHCI_QUIRK_HUB_POWER;
 503
 504         disable (ohci);
 505         ohci->regs = hcd->regs;
 506
 507         /* REVISIT this BIOS handshake is now moved into PCI "quirks", and
 508          * was never needed for most non-PCI systems ... remove the code?
 509          */
 510
 511 #ifndef IR_DISABLE
 512         /* SMM owns the HC?  not for long! */
 513         if (!no_handshake && ohci_readl (ohci,
 514                                         &ohci->regs->control) & OHCI_CTRL_IR) {
 515                 u32 temp;
 516
 517                 ohci_dbg (ohci, "USB HC TakeOver from BIOS/SMM\n");
 518
 519                 /* this timeout is arbitrary.  we make it long, so systems
 520                  * depending on usb keyboards may be usable even if the
 521                  * BIOS/SMM code seems pretty broken.
 522                  */
 523                 temp = 500;     /* arbitrary: five seconds */
 524
 525                 ohci_writel (ohci, OHCI_INTR_OC, &ohci->regs->intrenable);
 526                 ohci_writel (ohci, OHCI_OCR, &ohci->regs->cmdstatus);
 527                 while (ohci_readl (ohci, &ohci->regs->control) & OHCI_CTRL_IR) {
 528                         msleep (10);
 529                         if (--temp == 0) {
 530                                 ohci_err (ohci, "USB HC takeover failed!"
 531                                         "  (BIOS/SMM bug)\n");
 532                                 return -EBUSY;
 533                         }
 534                 }
 535                 ohci_usb_reset (ohci);
 536         }
 537 #endif
 538
 539         /* Disable HC interrupts */
 540         ohci_writel (ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
 541
 542         /* flush the writes, and save key bits like RWC */
 543         if (ohci_readl (ohci, &ohci->regs->control) & OHCI_CTRL_RWC)
 544                 ohci->hc_control |= OHCI_CTRL_RWC;
 545
 546         /* Read the number of ports unless overridden */
 547         if (ohci->num_ports == 0)
 548                 ohci->num_ports = roothub_a(ohci) & RH_A_NDP;
 549
 550         if (ohci->hcca)
 551                 return 0;
 552
 553         ohci->hcca = dma_alloc_coherent (hcd->self.controller,
 554                         sizeof *ohci->hcca, &ohci->hcca_dma, 0);
 555         if (!ohci->hcca)
 556                 return -ENOMEM;
 557
 558         if ((ret = ohci_mem_init (ohci)) < 0)
 559                 ohci_stop (hcd);
 560         else {
 561                 create_debug_files (ohci);
 562         }
 563
 564         return ret;
 565 }
 566
 567 /*-------------------------------------------------------------------------*/
 568
 569 /* Start an OHCI controller, set the BUS operational
 570  * resets USB and controller
 571  * enable interrupts
 572  */
 573 static int ohci_run (struct ohci_hcd *ohci)
 574 {
 575         u32                     mask, temp;
 576         int                     first = ohci->fminterval == 0;
 577         struct usb_hcd          *hcd = ohci_to_hcd(ohci);
 578
 579         disable (ohci);
 580
 581         /* boot firmware should have set this up (5.1.1.3.1) */
 582         if (first) {
 583
 584                 temp = ohci_readl (ohci, &ohci->regs->fminterval);
 585                 ohci->fminterval = temp & 0x3fff;
 586                 if (ohci->fminterval != FI)
 587                         ohci_dbg (ohci, "fminterval delta %d\n",
 588                                 ohci->fminterval - FI);
 589                 ohci->fminterval |= FSMP (ohci->fminterval) << 16;
 590                 /* also: power/overcurrent flags in roothub.a */
 591         }
 592
 593         /* Reset USB nearly "by the book".  RemoteWakeupConnected was
 594          * saved if boot firmware (BIOS/SMM/...) told us it's connected,
 595          * or if bus glue did the same (e.g. for PCI add-in cards with
 596          * PCI PM support).
 597          */
 598         if ((ohci->hc_control & OHCI_CTRL_RWC) != 0
 599                         && !device_may_wakeup(hcd->self.controller))
 600                 device_init_wakeup(hcd->self.controller, 1);
 601
 602         switch (ohci->hc_control & OHCI_CTRL_HCFS) {
 603         case OHCI_USB_OPER:
 604                 temp = 0;
 605                 break;
 606         case OHCI_USB_SUSPEND:
 607         case OHCI_USB_RESUME:
 608                 ohci->hc_control &= OHCI_CTRL_RWC;
 609                 ohci->hc_control |= OHCI_USB_RESUME;
 610                 temp = 10 /* msec wait */;
 611                 break;
 612         // case OHCI_USB_RESET:
 613         default:
 614                 ohci->hc_control &= OHCI_CTRL_RWC;
 615                 ohci->hc_control |= OHCI_USB_RESET;
 616                 temp = 50 /* msec wait */;
 617                 break;
 618         }
 619         ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 620         // flush the writes
 621         (void) ohci_readl (ohci, &ohci->regs->control);
 622         msleep(temp);
 623
 624         memset (ohci->hcca, 0, sizeof (struct ohci_hcca));
 625
 626         /* 2msec timelimit here means no irqs/preempt */
 627         spin_lock_irq (&ohci->lock);
 628
 629 retry:
 630         /* HC Reset requires max 10 us delay */
 631         ohci_writel (ohci, OHCI_HCR,  &ohci->regs->cmdstatus);
 632         temp = 30;      /* ... allow extra time */
 633         while ((ohci_readl (ohci, &ohci->regs->cmdstatus) & OHCI_HCR) != 0) {
 634                 if (--temp == 0) {
 635                         spin_unlock_irq (&ohci->lock);
 636                         ohci_err (ohci, "USB HC reset timed out!\n");
 637                         return -1;
 638                 }
 639                 udelay (1);
 640         }
 641
 642         /* now we're in the SUSPEND state ... must go OPERATIONAL
 643          * within 2msec else HC enters RESUME
 644          *
 645          * ... but some hardware won't init fmInterval "by the book"
 646          * (SiS, OPTi ...), so reset again instead.  SiS doesn't need
 647          * this if we write fmInterval after we're OPERATIONAL.
 648          * Unclear about ALi, ServerWorks, and others ... this could
 649          * easily be a longstanding bug in chip init on Linux.
 650          */
 651         if (ohci->flags & OHCI_QUIRK_INITRESET) {
 652                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 653                 // flush those writes
 654                 (void) ohci_readl (ohci, &ohci->regs->control);
 655         }
 656
 657         /* Tell the controller where the control and bulk lists are
 658          * The lists are empty now. */
 659         ohci_writel (ohci, 0, &ohci->regs->ed_controlhead);
 660         ohci_writel (ohci, 0, &ohci->regs->ed_bulkhead);
 661
 662         /* a reset clears this */
 663         ohci_writel (ohci, (u32) ohci->hcca_dma, &ohci->regs->hcca);
 664
 665         periodic_reinit (ohci);
 666
 667         /* some OHCI implementations are finicky about how they init.
 668          * bogus values here mean not even enumeration could work.
 669          */
 670         if ((ohci_readl (ohci, &ohci->regs->fminterval) & 0x3fff0000) == 0
 671                         || !ohci_readl (ohci, &ohci->regs->periodicstart)) {
 672                 if (!(ohci->flags & OHCI_QUIRK_INITRESET)) {
 673                         ohci->flags |= OHCI_QUIRK_INITRESET;
 674                         ohci_dbg (ohci, "enabling initreset quirk\n");
 675                         goto retry;
 676                 }
 677                 spin_unlock_irq (&ohci->lock);
 678                 ohci_err (ohci, "init err (%08x %04x)\n",
 679                         ohci_readl (ohci, &ohci->regs->fminterval),
 680                         ohci_readl (ohci, &ohci->regs->periodicstart));
 681                 return -EOVERFLOW;
 682         }
 683
 684         /* use rhsc irqs after khubd is fully initialized */
 685         hcd->poll_rh = 1;
 686         hcd->uses_new_polling = 1;
 687
 688         /* start controller operations */
 689         ohci->hc_control &= OHCI_CTRL_RWC;
 690         ohci->hc_control |= OHCI_CONTROL_INIT | OHCI_USB_OPER;
 691         ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 692         hcd->state = HC_STATE_RUNNING;
 693
 694         /* wake on ConnectStatusChange, matching external hubs */
 695         ohci_writel (ohci, RH_HS_DRWE, &ohci->regs->roothub.status);
 696
 697         /* Choose the interrupts we care about now, others later on demand */
 698         mask = OHCI_INTR_INIT;
 699         ohci_writel (ohci, ~0, &ohci->regs->intrstatus);
 700         ohci_writel (ohci, mask, &ohci->regs->intrenable);
 701
 702         /* handle root hub init quirks ... */
 703         temp = roothub_a (ohci);
 704         temp &= ~(RH_A_PSM | RH_A_OCPM);
 705         if (ohci->flags & OHCI_QUIRK_SUPERIO) {
 706                 /* NSC 87560 and maybe others */
 707                 temp |= RH_A_NOCP;
 708                 temp &= ~(RH_A_POTPGT | RH_A_NPS);
 709                 ohci_writel (ohci, temp, &ohci->regs->roothub.a);
 710         } else if ((ohci->flags & OHCI_QUIRK_AMD756) ||
 711                         (ohci->flags & OHCI_QUIRK_HUB_POWER)) {
 712                 /* hub power always on; required for AMD-756 and some
 713                  * Mac platforms.  ganged overcurrent reporting, if any.
 714                  */
 715                 temp |= RH_A_NPS;
 716                 ohci_writel (ohci, temp, &ohci->regs->roothub.a);
 717         }
 718         ohci_writel (ohci, RH_HS_LPSC, &ohci->regs->roothub.status);
 719         ohci_writel (ohci, (temp & RH_A_NPS) ? 0 : RH_B_PPCM,
 720                                                 &ohci->regs->roothub.b);
 721         // flush those writes
 722         (void) ohci_readl (ohci, &ohci->regs->control);
 723
 724         ohci->next_statechange = jiffies + STATECHANGE_DELAY;
 725         spin_unlock_irq (&ohci->lock);
 726
 727         // POTPGT delay is bits 24-31, in 2 ms units.
 728         mdelay ((temp >> 23) & 0x1fe);
 729         hcd->state = HC_STATE_RUNNING;
 730
 731         if (quirk_zfmicro(ohci)) {
 732                 /* Create timer to watch for bad queue state on ZF Micro */
 733                 setup_timer(&ohci->unlink_watchdog, unlink_watchdog_func,
 734                                 (unsigned long) ohci);
 735
 736                 ohci->eds_scheduled = 0;
 737                 ohci->ed_to_check = NULL;
 738         }
 739
 740         ohci_dump (ohci, 1);
 741
 742         return 0;
 743 }
 744
 745 /*-------------------------------------------------------------------------*/
 746
 747 /* an interrupt happens */
 748
 749 static irqreturn_t ohci_irq (struct usb_hcd *hcd)
 750 {
 751         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
 752         struct ohci_regs __iomem *regs = ohci->regs;
 753         int                     ints;
 754
 755         /* Read interrupt status (and flush pending writes).  We ignore the
 756          * optimization of checking the LSB of hcca->done_head; it doesn't
 757          * work on all systems (edge triggering for OHCI can be a factor).
 758          */
 759         ints = ohci_readl(ohci, &regs->intrstatus);
 760
 761         /* Check for an all 1's result which is a typical consequence
 762          * of dead, unclocked, or unplugged (CardBus...) devices
 763          */
 764         if (ints == ~(u32)0) {
 765                 disable (ohci);
 766                 ohci_dbg (ohci, "device removed!\n");
 767                 return IRQ_HANDLED;
 768         }
 769
 770         /* We only care about interrupts that are enabled */
 771         ints &= ohci_readl(ohci, &regs->intrenable);
 772
 773         /* interrupt for some other device? */
 774         if (ints == 0)
 775                 return IRQ_NOTMINE;
 776
 777         if (ints & OHCI_INTR_UE) {
 778                 // e.g. due to PCI Master/Target Abort
 779                 if (quirk_nec(ohci)) {
 780                         /* Workaround for a silicon bug in some NEC chips used
 781                          * in Apple's PowerBooks. Adapted from Darwin code.
 782                          */
 783                         ohci_err (ohci, "OHCI Unrecoverable Error, scheduling NEC chip restart\n");
 784
 785                         ohci_writel (ohci, OHCI_INTR_UE, &regs->intrdisable);
 786
 787                         schedule_work (&ohci->nec_work);
 788                 } else {
 789                         disable (ohci);
 790                         ohci_err (ohci, "OHCI Unrecoverable Error, disabled\n");
 791                 }
 792
 793                 ohci_dump (ohci, 1);
 794                 ohci_usb_reset (ohci);
 795         }
 796
 797         if (ints & OHCI_INTR_RHSC) {
 798                 ohci_vdbg(ohci, "rhsc\n");
 799                 ohci->next_statechange = jiffies + STATECHANGE_DELAY;
 800                 ohci_writel(ohci, OHCI_INTR_RD | OHCI_INTR_RHSC,
 801                                 &regs->intrstatus);
 802
 803                 /* NOTE: Vendors didn't always make the same implementation
 804                  * choices for RHSC.  Many followed the spec; RHSC triggers
 805                  * on an edge, like setting and maybe clearing a port status
 806                  * change bit.  With others it's level-triggered, active
 807                  * until khubd clears all the port status change bits.  We'll
 808                  * always disable it here and rely on polling until khubd
 809                  * re-enables it.
 810                  */
 811                 ohci_writel(ohci, OHCI_INTR_RHSC, &regs->intrdisable);
 812                 usb_hcd_poll_rh_status(hcd);
 813         }
 814
 815         /* For connect and disconnect events, we expect the controller
 816          * to turn on RHSC along with RD.  But for remote wakeup events
 817          * this might not happen.
 818          */
 819         else if (ints & OHCI_INTR_RD) {
 820                 ohci_vdbg(ohci, "resume detect\n");
 821                 ohci_writel(ohci, OHCI_INTR_RD, &regs->intrstatus);
 822                 hcd->poll_rh = 1;
 823                 if (ohci->autostop) {
 824                         spin_lock (&ohci->lock);
 825                         ohci_rh_resume (ohci);
 826                         spin_unlock (&ohci->lock);
 827                 } else
 828                         usb_hcd_resume_root_hub(hcd);
 829         }
 830
 831         if (ints & OHCI_INTR_WDH) {
 832                 spin_lock (&ohci->lock);
 833                 dl_done_list (ohci);
 834                 spin_unlock (&ohci->lock);
 835         }
 836
 837         if (quirk_zfmicro(ohci) && (ints & OHCI_INTR_SF)) {
 838                 spin_lock(&ohci->lock);
 839                 if (ohci->ed_to_check) {
 840                         struct ed *ed = ohci->ed_to_check;
 841
 842                         if (check_ed(ohci, ed)) {
 843                                 /* HC thinks the TD list is empty; HCD knows
 844                                  * at least one TD is outstanding
 845                                  */
 846                                 if (--ohci->zf_delay == 0) {
 847                                         struct td *td = list_entry(
 848                                                 ed->td_list.next,
 849                                                 struct td, td_list);
 850                                         ohci_warn(ohci,
 851                                                   "Reclaiming orphan TD %p\n",
 852                                                   td);
 853                                         takeback_td(ohci, td);
 854                                         ohci->ed_to_check = NULL;
 855                                 }
 856                         } else
 857                                 ohci->ed_to_check = NULL;
 858                 }
 859                 spin_unlock(&ohci->lock);
 860         }
 861
 862         /* could track INTR_SO to reduce available PCI/... bandwidth */
 863
 864         /* handle any pending URB/ED unlinks, leaving INTR_SF enabled
 865          * when there's still unlinking to be done (next frame).
 866          */
 867         spin_lock (&ohci->lock);
 868         if (ohci->ed_rm_list)
 869                 finish_unlinks (ohci, ohci_frame_no(ohci));
 870         if ((ints & OHCI_INTR_SF) != 0
 871                         && !ohci->ed_rm_list
 872                         && !ohci->ed_to_check
 873                         && HC_IS_RUNNING(hcd->state))
 874                 ohci_writel (ohci, OHCI_INTR_SF, &regs->intrdisable);
 875         spin_unlock (&ohci->lock);
 876
 877         if (HC_IS_RUNNING(hcd->state)) {
 878                 ohci_writel (ohci, ints, &regs->intrstatus);
 879                 ohci_writel (ohci, OHCI_INTR_MIE, &regs->intrenable);
 880                 // flush those writes
 881                 (void) ohci_readl (ohci, &ohci->regs->control);
 882         }
 883
 884         return IRQ_HANDLED;
 885 }
 886
 887 /*-------------------------------------------------------------------------*/
 888
 889 static void ohci_stop (struct usb_hcd *hcd)
 890 {
 891         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
 892
 893         ohci_dump (ohci, 1);
 894
 895         flush_scheduled_work();
 896
 897         ohci_usb_reset (ohci);
 898         ohci_writel (ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
 899         free_irq(hcd->irq, hcd);
 900         hcd->irq = -1;
 901
 902         if (quirk_zfmicro(ohci))
 903                 del_timer(&ohci->unlink_watchdog);
 904         if (quirk_amdiso(ohci))
 905                 amd_iso_dev_put();
 906
 907         remove_debug_files (ohci);
 908         ohci_mem_cleanup (ohci);
 909         if (ohci->hcca) {
 910                 dma_free_coherent (hcd->self.controller,
 911                                 sizeof *ohci->hcca,
 912                                 ohci->hcca, ohci->hcca_dma);
 913                 ohci->hcca = NULL;
 914                 ohci->hcca_dma = 0;
 915         }
 916 }
 917
 918 /*-------------------------------------------------------------------------*/
 919
 920 #if defined(CONFIG_PM) || defined(CONFIG_PCI)
 921
 922 /* must not be called from interrupt context */
 923 static int ohci_restart (struct ohci_hcd *ohci)
 924 {
 925         int temp;
 926         int i;
 927         struct urb_priv *priv;
 928
 929         spin_lock_irq(&ohci->lock);
 930         disable (ohci);
 931
 932         /* Recycle any "live" eds/tds (and urbs). */
 933         if (!list_empty (&ohci->pending))
 934                 ohci_dbg(ohci, "abort schedule...\n");
 935         list_for_each_entry (priv, &ohci->pending, pending) {
 936                 struct urb      *urb = priv->td[0]->urb;
 937                 struct ed       *ed = priv->ed;
 938
 939                 switch (ed->state) {
 940                 case ED_OPER:
 941                         ed->state = ED_UNLINK;
 942                         ed->hwINFO |= cpu_to_hc32(ohci, ED_DEQUEUE);
 943                         ed_deschedule (ohci, ed);
 944
 945                         ed->ed_next = ohci->ed_rm_list;
 946                         ed->ed_prev = NULL;
 947                         ohci->ed_rm_list = ed;
 948                         /* FALLTHROUGH */
 949                 case ED_UNLINK:
 950                         break;
 951                 default:
 952                         ohci_dbg(ohci, "bogus ed %p state %d\n",
 953                                         ed, ed->state);
 954                 }
 955
 956                 if (!urb->unlinked)
 957                         urb->unlinked = -ESHUTDOWN;
 958         }
 959         finish_unlinks (ohci, 0);
 960         spin_unlock_irq(&ohci->lock);
 961
 962         /* paranoia, in case that didn't work: */
 963
 964         /* empty the interrupt branches */
 965         for (i = 0; i < NUM_INTS; i++) ohci->load [i] = 0;
 966         for (i = 0; i < NUM_INTS; i++) ohci->hcca->int_table [i] = 0;
 967
 968         /* no EDs to remove */
 969         ohci->ed_rm_list = NULL;
 970
 971         /* empty control and bulk lists */
 972         ohci->ed_controltail = NULL;
 973         ohci->ed_bulktail    = NULL;
 974
 975         if ((temp = ohci_run (ohci)) < 0) {
 976                 ohci_err (ohci, "can't restart, %d\n", temp);
 977                 return temp;
 978         }
 979         ohci_dbg(ohci, "restart complete\n");
 980         return 0;
 981 }
 982
 983 #endif
 984
 985 /*-------------------------------------------------------------------------*/
 986
 987 #define DRIVER_INFO DRIVER_VERSION " " DRIVER_DESC
 988
 989 MODULE_AUTHOR (DRIVER_AUTHOR);
 990 MODULE_DESCRIPTION (DRIVER_INFO);
 991 MODULE_LICENSE ("GPL");
 992
 993 #ifdef CONFIG_PCI
 994 #include "ohci-pci.c"
 995 #define PCI_DRIVER              ohci_pci_driver
 996 #endif
 997
 998 #if defined(CONFIG_ARCH_SA1100) && defined(CONFIG_SA1111)
 999 #include "ohci-sa1111.c"
1000 #define SA1111_DRIVER           ohci_hcd_sa1111_driver
1001 #endif
1002
1003 #ifdef CONFIG_ARCH_S3C2410
1004 #include "ohci-s3c2410.c"
1005 #define PLATFORM_DRIVER         ohci_hcd_s3c2410_driver
1006 #endif
1007
1008 #ifdef CONFIG_ARCH_OMAP
1009 #include "ohci-omap.c"
1010 #define PLATFORM_DRIVER         ohci_hcd_omap_driver
1011 #endif
1012
1013 #ifdef CONFIG_ARCH_LH7A404
1014 #include "ohci-lh7a404.c"
1015 #define PLATFORM_DRIVER         ohci_hcd_lh7a404_driver
1016 #endif
1017
1018 #if defined(CONFIG_PXA27x) || defined(CONFIG_PXA3xx)
1019 #include "ohci-pxa27x.c"
1020 #define PLATFORM_DRIVER         ohci_hcd_pxa27x_driver
1021 #endif
1022
1023 #ifdef CONFIG_ARCH_EP93XX
1024 #include "ohci-ep93xx.c"
1025 #define PLATFORM_DRIVER         ohci_hcd_ep93xx_driver
1026 #endif
1027
1028 #ifdef CONFIG_SOC_AU1X00
1029 #include "ohci-au1xxx.c"
1030 #define PLATFORM_DRIVER         ohci_hcd_au1xxx_driver
1031 #endif
1032
1033 #ifdef CONFIG_PNX8550
1034 #include "ohci-pnx8550.c"
1035 #define PLATFORM_DRIVER         ohci_hcd_pnx8550_driver
1036 #endif
1037
1038 #ifdef CONFIG_USB_OHCI_HCD_PPC_SOC
1039 #include "ohci-ppc-soc.c"
1040 #define PLATFORM_DRIVER         ohci_hcd_ppc_soc_driver
1041 #endif
1042
1043 #ifdef CONFIG_ARCH_AT91
1044 #include "ohci-at91.c"
1045 #define PLATFORM_DRIVER         ohci_hcd_at91_driver
1046 #endif
1047
1048 #ifdef CONFIG_ARCH_PNX4008
1049 #include "ohci-pnx4008.c"
1050 #define PLATFORM_DRIVER         usb_hcd_pnx4008_driver
1051 #endif
1052
1053 #if defined(CONFIG_CPU_SUBTYPE_SH7720) || \
1054     defined(CONFIG_CPU_SUBTYPE_SH7721) || \
1055     defined(CONFIG_CPU_SUBTYPE_SH7763)
1056 #include "ohci-sh.c"
1057 #define PLATFORM_DRIVER         ohci_hcd_sh_driver
1058 #endif
1059
1060
1061 #ifdef CONFIG_USB_OHCI_HCD_PPC_OF
1062 #include "ohci-ppc-of.c"
1063 #define OF_PLATFORM_DRIVER      ohci_hcd_ppc_of_driver
1064 #endif
1065
1066 #ifdef CONFIG_PPC_PS3
1067 #include "ohci-ps3.c"
1068 #define PS3_SYSTEM_BUS_DRIVER   ps3_ohci_driver
1069 #endif
1070
1071 #ifdef CONFIG_USB_OHCI_HCD_SSB
1072 #include "ohci-ssb.c"
1073 #define SSB_OHCI_DRIVER         ssb_ohci_driver
1074 #endif
1075
1076 #ifdef CONFIG_MFD_SM501
1077 #include "ohci-sm501.c"
1078 #define SM501_OHCI_DRIVER       ohci_hcd_sm501_driver
1079 #endif
1080
1081 #if     !defined(PCI_DRIVER) &&         \
1082         !defined(PLATFORM_DRIVER) &&    \
1083         !defined(OF_PLATFORM_DRIVER) && \
1084         !defined(SA1111_DRIVER) &&      \
1085         !defined(PS3_SYSTEM_BUS_DRIVER) && \
1086         !defined(SM501_OHCI_DRIVER) && \
1087         !defined(SSB_OHCI_DRIVER)
1088 #error "missing bus glue for ohci-hcd"
1089 #endif
1090
1091 static int __init ohci_hcd_mod_init(void)
1092 {
1093         int retval = 0;
1094
1095         if (usb_disabled())
1096                 return -ENODEV;
1097
1098         printk (KERN_DEBUG "%s: " DRIVER_INFO "\n", hcd_name);
1099         pr_debug ("%s: block sizes: ed %Zd td %Zd\n", hcd_name,
1100                 sizeof (struct ed), sizeof (struct td));
1101
1102 #ifdef DEBUG
1103         ohci_debug_root = debugfs_create_dir("ohci", NULL);
1104         if (!ohci_debug_root) {
1105                 retval = -ENOENT;
1106                 goto error_debug;
1107         }
1108 #endif
1109
1110 #ifdef PS3_SYSTEM_BUS_DRIVER
1111         retval = ps3_ohci_driver_register(&PS3_SYSTEM_BUS_DRIVER);
1112         if (retval < 0)
1113                 goto error_ps3;
1114 #endif
1115
1116 #ifdef PLATFORM_DRIVER
1117         retval = platform_driver_register(&PLATFORM_DRIVER);
1118         if (retval < 0)
1119                 goto error_platform;
1120 #endif
1121
1122 #ifdef OF_PLATFORM_DRIVER
1123         retval = of_register_platform_driver(&OF_PLATFORM_DRIVER);
1124         if (retval < 0)
1125                 goto error_of_platform;
1126 #endif
1127
1128 #ifdef SA1111_DRIVER
1129         retval = sa1111_driver_register(&SA1111_DRIVER);
1130         if (retval < 0)
1131                 goto error_sa1111;
1132 #endif
1133
1134 #ifdef PCI_DRIVER
1135         retval = pci_register_driver(&PCI_DRIVER);
1136         if (retval < 0)
1137                 goto error_pci;
1138 #endif
1139
1140 #ifdef SSB_OHCI_DRIVER
1141         retval = ssb_driver_register(&SSB_OHCI_DRIVER);
1142         if (retval)
1143                 goto error_ssb;
1144 #endif
1145
1146 #ifdef SM501_OHCI_DRIVER
1147         retval = platform_driver_register(&SM501_OHCI_DRIVER);
1148         if (retval < 0)
1149                 goto error_sm501;
1150 #endif
1151
1152         return retval;
1153
1154         /* Error path */
1155 #ifdef SM501_OHCI_DRIVER
1156  error_sm501:
1157 #endif
1158 #ifdef SSB_OHCI_DRIVER
1159  error_ssb:
1160 #endif
1161 #ifdef PCI_DRIVER
1162         pci_unregister_driver(&PCI_DRIVER);
1163  error_pci:
1164 #endif
1165 #ifdef SA1111_DRIVER
1166         sa1111_driver_unregister(&SA1111_DRIVER);
1167  error_sa1111:
1168 #endif
1169 #ifdef OF_PLATFORM_DRIVER
1170         of_unregister_platform_driver(&OF_PLATFORM_DRIVER);
1171  error_of_platform:
1172 #endif
1173 #ifdef PLATFORM_DRIVER
1174         platform_driver_unregister(&PLATFORM_DRIVER);
1175  error_platform:
1176 #endif
1177 #ifdef PS3_SYSTEM_BUS_DRIVER
1178         ps3_ohci_driver_unregister(&PS3_SYSTEM_BUS_DRIVER);
1179  error_ps3:
1180 #endif
1181 #ifdef DEBUG
1182         debugfs_remove(ohci_debug_root);
1183         ohci_debug_root = NULL;
1184  error_debug:
1185 #endif
1186
1187         return retval;
1188 }
1189 module_init(ohci_hcd_mod_init);
1190
1191 static void __exit ohci_hcd_mod_exit(void)
1192 {
1193 #ifdef SM501_OHCI_DRIVER
1194         platform_driver_unregister(&SM501_OHCI_DRIVER);
1195 #endif
1196 #ifdef SSB_OHCI_DRIVER
1197         ssb_driver_unregister(&SSB_OHCI_DRIVER);
1198 #endif
1199 #ifdef PCI_DRIVER
1200         pci_unregister_driver(&PCI_DRIVER);
1201 #endif
1202 #ifdef SA1111_DRIVER
1203         sa1111_driver_unregister(&SA1111_DRIVER);
1204 #endif
1205 #ifdef OF_PLATFORM_DRIVER
1206         of_unregister_platform_driver(&OF_PLATFORM_DRIVER);
1207 #endif
1208 #ifdef PLATFORM_DRIVER
1209         platform_driver_unregister(&PLATFORM_DRIVER);
1210 #endif
1211 #ifdef PS3_SYSTEM_BUS_DRIVER
1212         ps3_ohci_driver_unregister(&PS3_SYSTEM_BUS_DRIVER);
1213 #endif
1214 #ifdef DEBUG
1215         debugfs_remove(ohci_debug_root);
1216 #endif
1217 }
1218 module_exit(ohci_hcd_mod_exit);
1219