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
  39 #include <asm/io.h>
  40 #include <asm/irq.h>
  41 #include <asm/system.h>
  42 #include <asm/unaligned.h>
  43 #include <asm/byteorder.h>
  44 #ifdef CONFIG_PPC_PS3
  45 #include <asm/firmware.h>
  46 #endif
  47
  48 #include "../core/hcd.h"
  49
  50 #define DRIVER_VERSION "2006 August 04"
  51 #define DRIVER_AUTHOR "Roman Weissgaerber, David Brownell"
  52 #define DRIVER_DESC "USB 1.1 'Open' Host Controller (OHCI) Driver"
  53
  54 /*-------------------------------------------------------------------------*/
  55
  56 #undef OHCI_VERBOSE_DEBUG       /* not always helpful */
  57
  58 /* For initializing controller (mask in an HCFS mode too) */
  59 #define OHCI_CONTROL_INIT       OHCI_CTRL_CBSR
  60 #define OHCI_INTR_INIT \
  61                 (OHCI_INTR_MIE | OHCI_INTR_RHSC | OHCI_INTR_UE \
  62                 | OHCI_INTR_RD | OHCI_INTR_WDH)
  63
  64 #ifdef __hppa__
  65 /* On PA-RISC, PDC can leave IR set incorrectly; ignore it there. */
  66 #define IR_DISABLE
  67 #endif
  68
  69 #ifdef CONFIG_ARCH_OMAP
  70 /* OMAP doesn't support IR (no SMM; not needed) */
  71 #define IR_DISABLE
  72 #endif
  73
  74 /*-------------------------------------------------------------------------*/
  75
  76 static const char       hcd_name [] = "ohci_hcd";
  77
  78 #define STATECHANGE_DELAY       msecs_to_jiffies(300)
  79
  80 #include "ohci.h"
  81
  82 static void ohci_dump (struct ohci_hcd *ohci, int verbose);
  83 static int ohci_init (struct ohci_hcd *ohci);
  84 static void ohci_stop (struct usb_hcd *hcd);
  85
  86 #include "ohci-hub.c"
  87 #include "ohci-dbg.c"
  88 #include "ohci-mem.c"
  89 #include "ohci-q.c"
  90
  91
  92 /*
  93  * On architectures with edge-triggered interrupts we must never return
  94  * IRQ_NONE.
  95  */
  96 #if defined(CONFIG_SA1111)  /* ... or other edge-triggered systems */
  97 #define IRQ_NOTMINE     IRQ_HANDLED
  98 #else
  99 #define IRQ_NOTMINE     IRQ_NONE
 100 #endif
 101
 102
 103 /* Some boards misreport power switching/overcurrent */
 104 static int distrust_firmware = 1;
 105 module_param (distrust_firmware, bool, 0);
 106 MODULE_PARM_DESC (distrust_firmware,
 107         "true to distrust firmware power/overcurrent setup");
 108
 109 /* Some boards leave IR set wrongly, since they fail BIOS/SMM handshakes */
 110 static int no_handshake = 0;
 111 module_param (no_handshake, bool, 0);
 112 MODULE_PARM_DESC (no_handshake, "true (not default) disables BIOS handshake");
 113
 114 /*-------------------------------------------------------------------------*/
 115
 116 /*
 117  * queue up an urb for anything except the root hub
 118  */
 119 static int ohci_urb_enqueue (
 120         struct usb_hcd  *hcd,
 121         struct usb_host_endpoint *ep,
 122         struct urb      *urb,
 123         gfp_t           mem_flags
 124 ) {
 125         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 126         struct ed       *ed;
 127         urb_priv_t      *urb_priv;
 128         unsigned int    pipe = urb->pipe;
 129         int             i, size = 0;
 130         unsigned long   flags;
 131         int             retval = 0;
 132
 133 #ifdef OHCI_VERBOSE_DEBUG
 134         urb_print (urb, "SUB", usb_pipein (pipe));
 135 #endif
 136
 137         /* every endpoint has a ed, locate and maybe (re)initialize it */
 138         if (! (ed = ed_get (ohci, ep, urb->dev, pipe, urb->interval)))
 139                 return -ENOMEM;
 140
 141         /* for the private part of the URB we need the number of TDs (size) */
 142         switch (ed->type) {
 143                 case PIPE_CONTROL:
 144                         /* td_submit_urb() doesn't yet handle these */
 145                         if (urb->transfer_buffer_length > 4096)
 146                                 return -EMSGSIZE;
 147
 148                         /* 1 TD for setup, 1 for ACK, plus ... */
 149                         size = 2;
 150                         /* FALLTHROUGH */
 151                 // case PIPE_INTERRUPT:
 152                 // case PIPE_BULK:
 153                 default:
 154                         /* one TD for every 4096 Bytes (can be upto 8K) */
 155                         size += urb->transfer_buffer_length / 4096;
 156                         /* ... and for any remaining bytes ... */
 157                         if ((urb->transfer_buffer_length % 4096) != 0)
 158                                 size++;
 159                         /* ... and maybe a zero length packet to wrap it up */
 160                         if (size == 0)
 161                                 size++;
 162                         else if ((urb->transfer_flags & URB_ZERO_PACKET) != 0
 163                                 && (urb->transfer_buffer_length
 164                                         % usb_maxpacket (urb->dev, pipe,
 165                                                 usb_pipeout (pipe))) == 0)
 166                                 size++;
 167                         break;
 168                 case PIPE_ISOCHRONOUS: /* number of packets from URB */
 169                         size = urb->number_of_packets;
 170                         break;
 171         }
 172
 173         /* allocate the private part of the URB */
 174         urb_priv = kmalloc (sizeof (urb_priv_t) + size * sizeof (struct td *),
 175                         mem_flags);
 176         if (!urb_priv)
 177                 return -ENOMEM;
 178         memset (urb_priv, 0, sizeof (urb_priv_t) + size * sizeof (struct td *));
 179         INIT_LIST_HEAD (&urb_priv->pending);
 180         urb_priv->length = size;
 181         urb_priv->ed = ed;
 182
 183         /* allocate the TDs (deferring hash chain updates) */
 184         for (i = 0; i < size; i++) {
 185                 urb_priv->td [i] = td_alloc (ohci, mem_flags);
 186                 if (!urb_priv->td [i]) {
 187                         urb_priv->length = i;
 188                         urb_free_priv (ohci, urb_priv);
 189                         return -ENOMEM;
 190                 }
 191         }
 192
 193         spin_lock_irqsave (&ohci->lock, flags);
 194
 195         /* don't submit to a dead HC */
 196         if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
 197                 retval = -ENODEV;
 198                 goto fail;
 199         }
 200         if (!HC_IS_RUNNING(hcd->state)) {
 201                 retval = -ENODEV;
 202                 goto fail;
 203         }
 204
 205         /* in case of unlink-during-submit */
 206         spin_lock (&urb->lock);
 207         if (urb->status != -EINPROGRESS) {
 208                 spin_unlock (&urb->lock);
 209                 urb->hcpriv = urb_priv;
 210                 finish_urb (ohci, urb);
 211                 retval = 0;
 212                 goto fail;
 213         }
 214
 215         /* schedule the ed if needed */
 216         if (ed->state == ED_IDLE) {
 217                 retval = ed_schedule (ohci, ed);
 218                 if (retval < 0)
 219                         goto fail0;
 220                 if (ed->type == PIPE_ISOCHRONOUS) {
 221                         u16     frame = ohci_frame_no(ohci);
 222
 223                         /* delay a few frames before the first TD */
 224                         frame += max_t (u16, 8, ed->interval);
 225                         frame &= ~(ed->interval - 1);
 226                         frame |= ed->branch;
 227                         urb->start_frame = frame;
 228
 229                         /* yes, only URB_ISO_ASAP is supported, and
 230                          * urb->start_frame is never used as input.
 231                          */
 232                 }
 233         } else if (ed->type == PIPE_ISOCHRONOUS)
 234                 urb->start_frame = ed->last_iso + ed->interval;
 235
 236         /* fill the TDs and link them to the ed; and
 237          * enable that part of the schedule, if needed
 238          * and update count of queued periodic urbs
 239          */
 240         urb->hcpriv = urb_priv;
 241         td_submit_urb (ohci, urb);
 242
 243 fail0:
 244         spin_unlock (&urb->lock);
 245 fail:
 246         if (retval)
 247                 urb_free_priv (ohci, urb_priv);
 248         spin_unlock_irqrestore (&ohci->lock, flags);
 249         return retval;
 250 }
 251
 252 /*
 253  * decouple the URB from the HC queues (TDs, urb_priv); it's
 254  * already marked using urb->status.  reporting is always done
 255  * asynchronously, and we might be dealing with an urb that's
 256  * partially transferred, or an ED with other urbs being unlinked.
 257  */
 258 static int ohci_urb_dequeue (struct usb_hcd *hcd, struct urb *urb)
 259 {
 260         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
 261         unsigned long           flags;
 262
 263 #ifdef OHCI_VERBOSE_DEBUG
 264         urb_print (urb, "UNLINK", 1);
 265 #endif
 266
 267         spin_lock_irqsave (&ohci->lock, flags);
 268         if (HC_IS_RUNNING(hcd->state)) {
 269                 urb_priv_t  *urb_priv;
 270
 271                 /* Unless an IRQ completed the unlink while it was being
 272                  * handed to us, flag it for unlink and giveback, and force
 273                  * some upcoming INTR_SF to call finish_unlinks()
 274                  */
 275                 urb_priv = urb->hcpriv;
 276                 if (urb_priv) {
 277                         if (urb_priv->ed->state == ED_OPER)
 278                                 start_ed_unlink (ohci, urb_priv->ed);
 279                 }
 280         } else {
 281                 /*
 282                  * with HC dead, we won't respect hc queue pointers
 283                  * any more ... just clean up every urb's memory.
 284                  */
 285                 if (urb->hcpriv)
 286                         finish_urb (ohci, urb);
 287         }
 288         spin_unlock_irqrestore (&ohci->lock, flags);
 289         return 0;
 290 }
 291
 292 /*-------------------------------------------------------------------------*/
 293
 294 /* frees config/altsetting state for endpoints,
 295  * including ED memory, dummy TD, and bulk/intr data toggle
 296  */
 297
 298 static void
 299 ohci_endpoint_disable (struct usb_hcd *hcd, struct usb_host_endpoint *ep)
 300 {
 301         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
 302         unsigned long           flags;
 303         struct ed               *ed = ep->hcpriv;
 304         unsigned                limit = 1000;
 305
 306         /* ASSERT:  any requests/urbs are being unlinked */
 307         /* ASSERT:  nobody can be submitting urbs for this any more */
 308
 309         if (!ed)
 310                 return;
 311
 312 rescan:
 313         spin_lock_irqsave (&ohci->lock, flags);
 314
 315         if (!HC_IS_RUNNING (hcd->state)) {
 316 sanitize:
 317                 ed->state = ED_IDLE;
 318                 finish_unlinks (ohci, 0);
 319         }
 320
 321         switch (ed->state) {
 322         case ED_UNLINK:         /* wait for hw to finish? */
 323                 /* major IRQ delivery trouble loses INTR_SF too... */
 324                 if (limit-- == 0) {
 325                         ohci_warn (ohci, "IRQ INTR_SF lossage\n");
 326                         goto sanitize;
 327                 }
 328                 spin_unlock_irqrestore (&ohci->lock, flags);
 329                 schedule_timeout_uninterruptible(1);
 330                 goto rescan;
 331         case ED_IDLE:           /* fully unlinked */
 332                 if (list_empty (&ed->td_list)) {
 333                         td_free (ohci, ed->dummy);
 334                         ed_free (ohci, ed);
 335                         break;
 336                 }
 337                 /* else FALL THROUGH */
 338         default:
 339                 /* caller was supposed to have unlinked any requests;
 340                  * that's not our job.  can't recover; must leak ed.
 341                  */
 342                 ohci_err (ohci, "leak ed %p (#%02x) state %d%s\n",
 343                         ed, ep->desc.bEndpointAddress, ed->state,
 344                         list_empty (&ed->td_list) ? "" : " (has tds)");
 345                 td_free (ohci, ed->dummy);
 346                 break;
 347         }
 348         ep->hcpriv = NULL;
 349         spin_unlock_irqrestore (&ohci->lock, flags);
 350         return;
 351 }
 352
 353 static int ohci_get_frame (struct usb_hcd *hcd)
 354 {
 355         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
 356
 357         return ohci_frame_no(ohci);
 358 }
 359
 360 static void ohci_usb_reset (struct ohci_hcd *ohci)
 361 {
 362         ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
 363         ohci->hc_control &= OHCI_CTRL_RWC;
 364         ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 365 }
 366
 367 /* ohci_shutdown forcibly disables IRQs and DMA, helping kexec and
 368  * other cases where the next software may expect clean state from the
 369  * "firmware".  this is bus-neutral, unlike shutdown() methods.
 370  */
 371 static void
 372 ohci_shutdown (struct usb_hcd *hcd)
 373 {
 374         struct ohci_hcd *ohci;
 375
 376         ohci = hcd_to_ohci (hcd);
 377         ohci_writel (ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
 378         ohci_usb_reset (ohci);
 379         /* flush the writes */
 380         (void) ohci_readl (ohci, &ohci->regs->control);
 381 }
 382
 383 /*-------------------------------------------------------------------------*
 384  * HC functions
 385  *-------------------------------------------------------------------------*/
 386
 387 /* init memory, and kick BIOS/SMM off */
 388
 389 static int ohci_init (struct ohci_hcd *ohci)
 390 {
 391         int ret;
 392         struct usb_hcd *hcd = ohci_to_hcd(ohci);
 393
 394         disable (ohci);
 395         ohci->regs = hcd->regs;
 396
 397         /* REVISIT this BIOS handshake is now moved into PCI "quirks", and
 398          * was never needed for most non-PCI systems ... remove the code?
 399          */
 400
 401 #ifndef IR_DISABLE
 402         /* SMM owns the HC?  not for long! */
 403         if (!no_handshake && ohci_readl (ohci,
 404                                         &ohci->regs->control) & OHCI_CTRL_IR) {
 405                 u32 temp;
 406
 407                 ohci_dbg (ohci, "USB HC TakeOver from BIOS/SMM\n");
 408
 409                 /* this timeout is arbitrary.  we make it long, so systems
 410                  * depending on usb keyboards may be usable even if the
 411                  * BIOS/SMM code seems pretty broken.
 412                  */
 413                 temp = 500;     /* arbitrary: five seconds */
 414
 415                 ohci_writel (ohci, OHCI_INTR_OC, &ohci->regs->intrenable);
 416                 ohci_writel (ohci, OHCI_OCR, &ohci->regs->cmdstatus);
 417                 while (ohci_readl (ohci, &ohci->regs->control) & OHCI_CTRL_IR) {
 418                         msleep (10);
 419                         if (--temp == 0) {
 420                                 ohci_err (ohci, "USB HC takeover failed!"
 421                                         "  (BIOS/SMM bug)\n");
 422                                 return -EBUSY;
 423                         }
 424                 }
 425                 ohci_usb_reset (ohci);
 426         }
 427 #endif
 428
 429         /* Disable HC interrupts */
 430         ohci_writel (ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
 431
 432         /* flush the writes, and save key bits like RWC */
 433         if (ohci_readl (ohci, &ohci->regs->control) & OHCI_CTRL_RWC)
 434                 ohci->hc_control |= OHCI_CTRL_RWC;
 435
 436         /* Read the number of ports unless overridden */
 437         if (ohci->num_ports == 0)
 438                 ohci->num_ports = roothub_a(ohci) & RH_A_NDP;
 439
 440         if (ohci->hcca)
 441                 return 0;
 442
 443         ohci->hcca = dma_alloc_coherent (hcd->self.controller,
 444                         sizeof *ohci->hcca, &ohci->hcca_dma, 0);
 445         if (!ohci->hcca)
 446                 return -ENOMEM;
 447
 448         if ((ret = ohci_mem_init (ohci)) < 0)
 449                 ohci_stop (hcd);
 450         else {
 451                 create_debug_files (ohci);
 452         }
 453
 454         return ret;
 455 }
 456
 457 /*-------------------------------------------------------------------------*/
 458
 459 /* Start an OHCI controller, set the BUS operational
 460  * resets USB and controller
 461  * enable interrupts
 462  */
 463 static int ohci_run (struct ohci_hcd *ohci)
 464 {
 465         u32                     mask, temp;
 466         int                     first = ohci->fminterval == 0;
 467         struct usb_hcd          *hcd = ohci_to_hcd(ohci);
 468
 469         disable (ohci);
 470
 471         /* boot firmware should have set this up (5.1.1.3.1) */
 472         if (first) {
 473
 474                 temp = ohci_readl (ohci, &ohci->regs->fminterval);
 475                 ohci->fminterval = temp & 0x3fff;
 476                 if (ohci->fminterval != FI)
 477                         ohci_dbg (ohci, "fminterval delta %d\n",
 478                                 ohci->fminterval - FI);
 479                 ohci->fminterval |= FSMP (ohci->fminterval) << 16;
 480                 /* also: power/overcurrent flags in roothub.a */
 481         }
 482
 483         /* Reset USB nearly "by the book".  RemoteWakeupConnected was
 484          * saved if boot firmware (BIOS/SMM/...) told us it's connected,
 485          * or if bus glue did the same (e.g. for PCI add-in cards with
 486          * PCI PM support).
 487          */
 488         if ((ohci->hc_control & OHCI_CTRL_RWC) != 0
 489                         && !device_may_wakeup(hcd->self.controller))
 490                 device_init_wakeup(hcd->self.controller, 1);
 491
 492         switch (ohci->hc_control & OHCI_CTRL_HCFS) {
 493         case OHCI_USB_OPER:
 494                 temp = 0;
 495                 break;
 496         case OHCI_USB_SUSPEND:
 497         case OHCI_USB_RESUME:
 498                 ohci->hc_control &= OHCI_CTRL_RWC;
 499                 ohci->hc_control |= OHCI_USB_RESUME;
 500                 temp = 10 /* msec wait */;
 501                 break;
 502         // case OHCI_USB_RESET:
 503         default:
 504                 ohci->hc_control &= OHCI_CTRL_RWC;
 505                 ohci->hc_control |= OHCI_USB_RESET;
 506                 temp = 50 /* msec wait */;
 507                 break;
 508         }
 509         ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 510         // flush the writes
 511         (void) ohci_readl (ohci, &ohci->regs->control);
 512         msleep(temp);
 513
 514         memset (ohci->hcca, 0, sizeof (struct ohci_hcca));
 515
 516         /* 2msec timelimit here means no irqs/preempt */
 517         spin_lock_irq (&ohci->lock);
 518
 519 retry:
 520         /* HC Reset requires max 10 us delay */
 521         ohci_writel (ohci, OHCI_HCR,  &ohci->regs->cmdstatus);
 522         temp = 30;      /* ... allow extra time */
 523         while ((ohci_readl (ohci, &ohci->regs->cmdstatus) & OHCI_HCR) != 0) {
 524                 if (--temp == 0) {
 525                         spin_unlock_irq (&ohci->lock);
 526                         ohci_err (ohci, "USB HC reset timed out!\n");
 527                         return -1;
 528                 }
 529                 udelay (1);
 530         }
 531
 532         /* now we're in the SUSPEND state ... must go OPERATIONAL
 533          * within 2msec else HC enters RESUME
 534          *
 535          * ... but some hardware won't init fmInterval "by the book"
 536          * (SiS, OPTi ...), so reset again instead.  SiS doesn't need
 537          * this if we write fmInterval after we're OPERATIONAL.
 538          * Unclear about ALi, ServerWorks, and others ... this could
 539          * easily be a longstanding bug in chip init on Linux.
 540          */
 541         if (ohci->flags & OHCI_QUIRK_INITRESET) {
 542                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 543                 // flush those writes
 544                 (void) ohci_readl (ohci, &ohci->regs->control);
 545         }
 546
 547         /* Tell the controller where the control and bulk lists are
 548          * The lists are empty now. */
 549         ohci_writel (ohci, 0, &ohci->regs->ed_controlhead);
 550         ohci_writel (ohci, 0, &ohci->regs->ed_bulkhead);
 551
 552         /* a reset clears this */
 553         ohci_writel (ohci, (u32) ohci->hcca_dma, &ohci->regs->hcca);
 554
 555         periodic_reinit (ohci);
 556
 557         /* some OHCI implementations are finicky about how they init.
 558          * bogus values here mean not even enumeration could work.
 559          */
 560         if ((ohci_readl (ohci, &ohci->regs->fminterval) & 0x3fff0000) == 0
 561                         || !ohci_readl (ohci, &ohci->regs->periodicstart)) {
 562                 if (!(ohci->flags & OHCI_QUIRK_INITRESET)) {
 563                         ohci->flags |= OHCI_QUIRK_INITRESET;
 564                         ohci_dbg (ohci, "enabling initreset quirk\n");
 565                         goto retry;
 566                 }
 567                 spin_unlock_irq (&ohci->lock);
 568                 ohci_err (ohci, "init err (%08x %04x)\n",
 569                         ohci_readl (ohci, &ohci->regs->fminterval),
 570                         ohci_readl (ohci, &ohci->regs->periodicstart));
 571                 return -EOVERFLOW;
 572         }
 573
 574         /* use rhsc irqs after khubd is fully initialized */
 575         hcd->poll_rh = 1;
 576         hcd->uses_new_polling = 1;
 577
 578         /* start controller operations */
 579         ohci->hc_control &= OHCI_CTRL_RWC;
 580         ohci->hc_control |= OHCI_CONTROL_INIT | OHCI_USB_OPER;
 581         ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 582         hcd->state = HC_STATE_RUNNING;
 583
 584         /* wake on ConnectStatusChange, matching external hubs */
 585         ohci_writel (ohci, RH_HS_DRWE, &ohci->regs->roothub.status);
 586
 587         /* Choose the interrupts we care about now, others later on demand */
 588         mask = OHCI_INTR_INIT;
 589         ohci_writel (ohci, ~0, &ohci->regs->intrstatus);
 590         ohci_writel (ohci, mask, &ohci->regs->intrenable);
 591
 592         /* handle root hub init quirks ... */
 593         temp = roothub_a (ohci);
 594         temp &= ~(RH_A_PSM | RH_A_OCPM);
 595         if (ohci->flags & OHCI_QUIRK_SUPERIO) {
 596                 /* NSC 87560 and maybe others */
 597                 temp |= RH_A_NOCP;
 598                 temp &= ~(RH_A_POTPGT | RH_A_NPS);
 599                 ohci_writel (ohci, temp, &ohci->regs->roothub.a);
 600         } else if ((ohci->flags & OHCI_QUIRK_AMD756) || distrust_firmware) {
 601                 /* hub power always on; required for AMD-756 and some
 602                  * Mac platforms.  ganged overcurrent reporting, if any.
 603                  */
 604                 temp |= RH_A_NPS;
 605                 ohci_writel (ohci, temp, &ohci->regs->roothub.a);
 606         }
 607         ohci_writel (ohci, RH_HS_LPSC, &ohci->regs->roothub.status);
 608         ohci_writel (ohci, (temp & RH_A_NPS) ? 0 : RH_B_PPCM,
 609                                                 &ohci->regs->roothub.b);
 610         // flush those writes
 611         (void) ohci_readl (ohci, &ohci->regs->control);
 612
 613         ohci->next_statechange = jiffies + STATECHANGE_DELAY;
 614         spin_unlock_irq (&ohci->lock);
 615
 616         // POTPGT delay is bits 24-31, in 2 ms units.
 617         mdelay ((temp >> 23) & 0x1fe);
 618         hcd->state = HC_STATE_RUNNING;
 619
 620         ohci_dump (ohci, 1);
 621
 622         return 0;
 623 }
 624
 625 /*-------------------------------------------------------------------------*/
 626
 627 /* an interrupt happens */
 628
 629 static irqreturn_t ohci_irq (struct usb_hcd *hcd)
 630 {
 631         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
 632         struct ohci_regs __iomem *regs = ohci->regs;
 633         int                     ints;
 634
 635         /* we can eliminate a (slow) ohci_readl()
 636            if _only_ WDH caused this irq */
 637         if ((ohci->hcca->done_head != 0)
 638                         && ! (hc32_to_cpup (ohci, &ohci->hcca->done_head)
 639                                 & 0x01)) {
 640                 ints =  OHCI_INTR_WDH;
 641
 642         /* cardbus/... hardware gone before remove() */
 643         } else if ((ints = ohci_readl (ohci, &regs->intrstatus)) == ~(u32)0) {
 644                 disable (ohci);
 645                 ohci_dbg (ohci, "device removed!\n");
 646                 return IRQ_HANDLED;
 647
 648         /* interrupt for some other device? */
 649         } else if ((ints &= ohci_readl (ohci, &regs->intrenable)) == 0) {
 650                 return IRQ_NOTMINE;
 651         }
 652
 653         if (ints & OHCI_INTR_UE) {
 654                 disable (ohci);
 655                 ohci_err (ohci, "OHCI Unrecoverable Error, disabled\n");
 656                 // e.g. due to PCI Master/Target Abort
 657
 658                 ohci_dump (ohci, 1);
 659                 ohci_usb_reset (ohci);
 660         }
 661
 662         if (ints & OHCI_INTR_RHSC) {
 663                 ohci_vdbg(ohci, "rhsc\n");
 664                 ohci->next_statechange = jiffies + STATECHANGE_DELAY;
 665                 ohci_writel(ohci, OHCI_INTR_RD | OHCI_INTR_RHSC,
 666                                 &regs->intrstatus);
 667
 668                 /* NOTE: Vendors didn't always make the same implementation
 669                  * choices for RHSC.  Many followed the spec; RHSC triggers
 670                  * on an edge, like setting and maybe clearing a port status
 671                  * change bit.  With others it's level-triggered, active
 672                  * until khubd clears all the port status change bits.  We'll
 673                  * always disable it here and rely on polling until khubd
 674                  * re-enables it.
 675                  */
 676                 ohci_writel(ohci, OHCI_INTR_RHSC, &regs->intrdisable);
 677                 usb_hcd_poll_rh_status(hcd);
 678         }
 679
 680         /* For connect and disconnect events, we expect the controller
 681          * to turn on RHSC along with RD.  But for remote wakeup events
 682          * this might not happen.
 683          */
 684         else if (ints & OHCI_INTR_RD) {
 685                 ohci_vdbg(ohci, "resume detect\n");
 686                 ohci_writel(ohci, OHCI_INTR_RD, &regs->intrstatus);
 687                 hcd->poll_rh = 1;
 688                 if (ohci->autostop) {
 689                         spin_lock (&ohci->lock);
 690                         ohci_rh_resume (ohci);
 691                         spin_unlock (&ohci->lock);
 692                 } else
 693                         usb_hcd_resume_root_hub(hcd);
 694         }
 695
 696         if (ints & OHCI_INTR_WDH) {
 697                 if (HC_IS_RUNNING(hcd->state))
 698                         ohci_writel (ohci, OHCI_INTR_WDH, &regs->intrdisable);
 699                 spin_lock (&ohci->lock);
 700                 dl_done_list (ohci);
 701                 spin_unlock (&ohci->lock);
 702                 if (HC_IS_RUNNING(hcd->state))
 703                         ohci_writel (ohci, OHCI_INTR_WDH, &regs->intrenable);
 704         }
 705
 706         /* could track INTR_SO to reduce available PCI/... bandwidth */
 707
 708         /* handle any pending URB/ED unlinks, leaving INTR_SF enabled
 709          * when there's still unlinking to be done (next frame).
 710          */
 711         spin_lock (&ohci->lock);
 712         if (ohci->ed_rm_list)
 713                 finish_unlinks (ohci, ohci_frame_no(ohci));
 714         if ((ints & OHCI_INTR_SF) != 0 && !ohci->ed_rm_list
 715                         && HC_IS_RUNNING(hcd->state))
 716                 ohci_writel (ohci, OHCI_INTR_SF, &regs->intrdisable);
 717         spin_unlock (&ohci->lock);
 718
 719         if (HC_IS_RUNNING(hcd->state)) {
 720                 ohci_writel (ohci, ints, &regs->intrstatus);
 721                 ohci_writel (ohci, OHCI_INTR_MIE, &regs->intrenable);
 722                 // flush those writes
 723                 (void) ohci_readl (ohci, &ohci->regs->control);
 724         }
 725
 726         return IRQ_HANDLED;
 727 }
 728
 729 /*-------------------------------------------------------------------------*/
 730
 731 static void ohci_stop (struct usb_hcd *hcd)
 732 {
 733         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
 734
 735         ohci_dump (ohci, 1);
 736
 737         flush_scheduled_work();
 738
 739         ohci_usb_reset (ohci);
 740         ohci_writel (ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
 741         free_irq(hcd->irq, hcd);
 742         hcd->irq = -1;
 743
 744         remove_debug_files (ohci);
 745         ohci_mem_cleanup (ohci);
 746         if (ohci->hcca) {
 747                 dma_free_coherent (hcd->self.controller,
 748                                 sizeof *ohci->hcca,
 749                                 ohci->hcca, ohci->hcca_dma);
 750                 ohci->hcca = NULL;
 751                 ohci->hcca_dma = 0;
 752         }
 753 }
 754
 755 /*-------------------------------------------------------------------------*/
 756
 757 /* must not be called from interrupt context */
 758
 759 #ifdef  CONFIG_PM
 760
 761 static int ohci_restart (struct ohci_hcd *ohci)
 762 {
 763         int temp;
 764         int i;
 765         struct urb_priv *priv;
 766
 767         /* mark any devices gone, so they do nothing till khubd disconnects.
 768          * recycle any "live" eds/tds (and urbs) right away.
 769          * later, khubd disconnect processing will recycle the other state,
 770          * (either as disconnect/reconnect, or maybe someday as a reset).
 771          */
 772         spin_lock_irq(&ohci->lock);
 773         disable (ohci);
 774         usb_root_hub_lost_power(ohci_to_hcd(ohci)->self.root_hub);
 775         if (!list_empty (&ohci->pending))
 776                 ohci_dbg(ohci, "abort schedule...\n");
 777         list_for_each_entry (priv, &ohci->pending, pending) {
 778                 struct urb      *urb = priv->td[0]->urb;
 779                 struct ed       *ed = priv->ed;
 780
 781                 switch (ed->state) {
 782                 case ED_OPER:
 783                         ed->state = ED_UNLINK;
 784                         ed->hwINFO |= cpu_to_hc32(ohci, ED_DEQUEUE);
 785                         ed_deschedule (ohci, ed);
 786
 787                         ed->ed_next = ohci->ed_rm_list;
 788                         ed->ed_prev = NULL;
 789                         ohci->ed_rm_list = ed;
 790                         /* FALLTHROUGH */
 791                 case ED_UNLINK:
 792                         break;
 793                 default:
 794                         ohci_dbg(ohci, "bogus ed %p state %d\n",
 795                                         ed, ed->state);
 796                 }
 797
 798                 spin_lock (&urb->lock);
 799                 urb->status = -ESHUTDOWN;
 800                 spin_unlock (&urb->lock);
 801         }
 802         finish_unlinks (ohci, 0);
 803         spin_unlock_irq(&ohci->lock);
 804
 805         /* paranoia, in case that didn't work: */
 806
 807         /* empty the interrupt branches */
 808         for (i = 0; i < NUM_INTS; i++) ohci->load [i] = 0;
 809         for (i = 0; i < NUM_INTS; i++) ohci->hcca->int_table [i] = 0;
 810
 811         /* no EDs to remove */
 812         ohci->ed_rm_list = NULL;
 813
 814         /* empty control and bulk lists */
 815         ohci->ed_controltail = NULL;
 816         ohci->ed_bulktail    = NULL;
 817
 818         if ((temp = ohci_run (ohci)) < 0) {
 819                 ohci_err (ohci, "can't restart, %d\n", temp);
 820                 return temp;
 821         }
 822         ohci_dbg(ohci, "restart complete\n");
 823         return 0;
 824 }
 825 #endif
 826
 827 /*-------------------------------------------------------------------------*/
 828
 829 #define DRIVER_INFO DRIVER_VERSION " " DRIVER_DESC
 830
 831 MODULE_AUTHOR (DRIVER_AUTHOR);
 832 MODULE_DESCRIPTION (DRIVER_INFO);
 833 MODULE_LICENSE ("GPL");
 834
 835 #ifdef CONFIG_PCI
 836 #include "ohci-pci.c"
 837 #define PCI_DRIVER              ohci_pci_driver
 838 #endif
 839
 840 #ifdef CONFIG_SA1111
 841 #include "ohci-sa1111.c"
 842 #define SA1111_DRIVER           ohci_hcd_sa1111_driver
 843 #endif
 844
 845 #ifdef CONFIG_ARCH_S3C2410
 846 #include "ohci-s3c2410.c"
 847 #define PLATFORM_DRIVER         ohci_hcd_s3c2410_driver
 848 #endif
 849
 850 #ifdef CONFIG_ARCH_OMAP
 851 #include "ohci-omap.c"
 852 #define PLATFORM_DRIVER         ohci_hcd_omap_driver
 853 #endif
 854
 855 #ifdef CONFIG_ARCH_LH7A404
 856 #include "ohci-lh7a404.c"
 857 #define PLATFORM_DRIVER         ohci_hcd_lh7a404_driver
 858 #endif
 859
 860 #ifdef CONFIG_PXA27x
 861 #include "ohci-pxa27x.c"
 862 #define PLATFORM_DRIVER         ohci_hcd_pxa27x_driver
 863 #endif
 864
 865 #ifdef CONFIG_ARCH_EP93XX
 866 #include "ohci-ep93xx.c"
 867 #define PLATFORM_DRIVER         ohci_hcd_ep93xx_driver
 868 #endif
 869
 870 #ifdef CONFIG_SOC_AU1X00
 871 #include "ohci-au1xxx.c"
 872 #define PLATFORM_DRIVER         ohci_hcd_au1xxx_driver
 873 #endif
 874
 875 #ifdef CONFIG_PNX8550
 876 #include "ohci-pnx8550.c"
 877 #define PLATFORM_DRIVER         ohci_hcd_pnx8550_driver
 878 #endif
 879
 880 #ifdef CONFIG_USB_OHCI_HCD_PPC_SOC
 881 #include "ohci-ppc-soc.c"
 882 #define PLATFORM_DRIVER         ohci_hcd_ppc_soc_driver
 883 #endif
 884
 885 #ifdef CONFIG_ARCH_AT91
 886 #include "ohci-at91.c"
 887 #define PLATFORM_DRIVER         ohci_hcd_at91_driver
 888 #endif
 889
 890 #ifdef CONFIG_ARCH_PNX4008
 891 #include "ohci-pnx4008.c"
 892 #define PLATFORM_DRIVER         usb_hcd_pnx4008_driver
 893 #endif
 894
 895
 896 #ifdef CONFIG_USB_OHCI_HCD_PPC_OF
 897 #include "ohci-ppc-of.c"
 898 #define OF_PLATFORM_DRIVER      ohci_hcd_ppc_of_driver
 899 #endif
 900
 901 #ifdef CONFIG_PPC_PS3
 902 #include "ohci-ps3.c"
 903 #define PS3_SYSTEM_BUS_DRIVER   ps3_ohci_sb_driver
 904 #endif
 905
 906 #if     !defined(PCI_DRIVER) &&         \
 907         !defined(PLATFORM_DRIVER) &&    \
 908         !defined(OF_PLATFORM_DRIVER) && \
 909         !defined(SA1111_DRIVER) &&      \
 910         !defined(PS3_SYSTEM_BUS_DRIVER)
 911 #error "missing bus glue for ohci-hcd"
 912 #endif
 913
 914 static int __init ohci_hcd_mod_init(void)
 915 {
 916         int retval = 0;
 917
 918         if (usb_disabled())
 919                 return -ENODEV;
 920
 921         printk (KERN_DEBUG "%s: " DRIVER_INFO "\n", hcd_name);
 922         pr_debug ("%s: block sizes: ed %Zd td %Zd\n", hcd_name,
 923                 sizeof (struct ed), sizeof (struct td));
 924
 925 #ifdef PS3_SYSTEM_BUS_DRIVER
 926         if (firmware_has_feature(FW_FEATURE_PS3_LV1)) {
 927                 retval = ps3_system_bus_driver_register(
 928                                 &PS3_SYSTEM_BUS_DRIVER);
 929                 if (retval < 0)
 930                         goto error_ps3;
 931         }
 932 #endif
 933
 934 #ifdef PLATFORM_DRIVER
 935         retval = platform_driver_register(&PLATFORM_DRIVER);
 936         if (retval < 0)
 937                 goto error_platform;
 938 #endif
 939
 940 #ifdef OF_PLATFORM_DRIVER
 941         retval = of_register_platform_driver(&OF_PLATFORM_DRIVER);
 942         if (retval < 0)
 943                 goto error_of_platform;
 944 #endif
 945
 946 #ifdef SA1111_DRIVER
 947         retval = sa1111_driver_register(&SA1111_DRIVER);
 948         if (retval < 0)
 949                 goto error_sa1111;
 950 #endif
 951
 952 #ifdef PCI_DRIVER
 953         retval = pci_register_driver(&PCI_DRIVER);
 954         if (retval < 0)
 955                 goto error_pci;
 956 #endif
 957
 958         return retval;
 959
 960         /* Error path */
 961 #ifdef PCI_DRIVER
 962  error_pci:
 963 #endif
 964 #ifdef SA1111_DRIVER
 965         sa1111_driver_unregister(&SA1111_DRIVER);
 966  error_sa1111:
 967 #endif
 968 #ifdef OF_PLATFORM_DRIVER
 969         of_unregister_platform_driver(&OF_PLATFORM_DRIVER);
 970  error_of_platform:
 971 #endif
 972 #ifdef PLATFORM_DRIVER
 973         platform_driver_unregister(&PLATFORM_DRIVER);
 974  error_platform:
 975 #endif
 976 #ifdef PS3_SYSTEM_BUS_DRIVER
 977         if (firmware_has_feature(FW_FEATURE_PS3_LV1))
 978                 ps3_system_bus_driver_unregister(&PS3_SYSTEM_BUS_DRIVER);
 979  error_ps3:
 980 #endif
 981         return retval;
 982 }
 983 module_init(ohci_hcd_mod_init);
 984
 985 static void __exit ohci_hcd_mod_exit(void)
 986 {
 987 #ifdef PCI_DRIVER
 988         pci_unregister_driver(&PCI_DRIVER);
 989 #endif
 990 #ifdef SA1111_DRIVER
 991         sa1111_driver_unregister(&SA1111_DRIVER);
 992 #endif
 993 #ifdef OF_PLATFORM_DRIVER
 994         of_unregister_platform_driver(&OF_PLATFORM_DRIVER);
 995 #endif
 996 #ifdef PLATFORM_DRIVER
 997         platform_driver_unregister(&PLATFORM_DRIVER);
 998 #endif
 999 #ifdef PS3_SYSTEM_BUS_DRIVER
1000         if (firmware_has_feature(FW_FEATURE_PS3_LV1))
1001                 ps3_system_bus_driver_unregister(&PS3_SYSTEM_BUS_DRIVER);
1002 #endif
1003 }
1004 module_exit(ohci_hcd_mod_exit);
1005