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  * History:
  19  *
  20  * 2004/03/24 LH7A404 support (Durgesh Pattamatta & Marc Singer)
  21  * 2004/02/04 use generic dma_* functions instead of pci_* (dsaxena@plexity.net)
  22  * 2003/02/24 show registers in sysfs (Kevin Brosius)
  23  *
  24  * 2002/09/03 get rid of ed hashtables, rework periodic scheduling and
  25  *      bandwidth accounting; if debugging, show schedules in driverfs
  26  * 2002/07/19 fixes to management of ED and schedule state.
  27  * 2002/06/09 SA-1111 support (Christopher Hoover)
  28  * 2002/06/01 remember frame when HC won't see EDs any more; use that info
  29  *      to fix urb unlink races caused by interrupt latency assumptions;
  30  *      minor ED field and function naming updates
  31  * 2002/01/18 package as a patch for 2.5.3; this should match the
  32  *      2.4.17 kernel modulo some bugs being fixed.
  33  *
  34  * 2001/10/18 merge pmac cleanup (Benjamin Herrenschmidt) and bugfixes
  35  *      from post-2.4.5 patches.
  36  * 2001/09/20 URB_ZERO_PACKET support; hcca_dma portability, OPTi warning
  37  * 2001/09/07 match PCI PM changes, errnos from Linus' tree
  38  * 2001/05/05 fork 2.4.5 version into "hcd" framework, cleanup, simplify;
  39  *      pbook pci quirks gone (please fix pbook pci sw!) (db)
  40  *
  41  * 2001/04/08 Identify version on module load (gb)
  42  * 2001/03/24 td/ed hashing to remove bus_to_virt (Steve Longerbeam);
  43         pci_map_single (db)
  44  * 2001/03/21 td and dev/ed allocation uses new pci_pool API (db)
  45  * 2001/03/07 hcca allocation uses pci_alloc_consistent (Steve Longerbeam)
  46  *
  47  * 2000/09/26 fixed races in removing the private portion of the urb
  48  * 2000/09/07 disable bulk and control lists when unlinking the last
  49  *      endpoint descriptor in order to avoid unrecoverable errors on
  50  *      the Lucent chips. (rwc@sgi)
  51  * 2000/08/29 use bandwidth claiming hooks (thanks Randy!), fix some
  52  *      urb unlink probs, indentation fixes
  53  * 2000/08/11 various oops fixes mostly affecting iso and cleanup from
  54  *      device unplugs.
  55  * 2000/06/28 use PCI hotplug framework, for better power management
  56  *      and for Cardbus support (David Brownell)
  57  * 2000/earlier:  fixes for NEC/Lucent chips; suspend/resume handling
  58  *      when the controller loses power; handle UE; cleanup; ...
  59  *
  60  * v5.2 1999/12/07 URB 3rd preview,
  61  * v5.1 1999/11/30 URB 2nd preview, cpia, (usb-scsi)
  62  * v5.0 1999/11/22 URB Technical preview, Paul Mackerras powerbook susp/resume
  63  *      i386: HUB, Keyboard, Mouse, Printer
  64  *
  65  * v4.3 1999/10/27 multiple HCs, bulk_request
  66  * v4.2 1999/09/05 ISO API alpha, new dev alloc, neg Error-codes
  67  * v4.1 1999/08/27 Randy Dunlap's - ISO API first impl.
  68  * v4.0 1999/08/18
  69  * v3.0 1999/06/25
  70  * v2.1 1999/05/09  code clean up
  71  * v2.0 1999/05/04
  72  * v1.0 1999/04/27 initial release
  73  *
  74  * This file is licenced under the GPL.
  75  */
  76
  77 #include <linux/config.h>
  78
  79 #ifdef CONFIG_USB_DEBUG
  80 #       define DEBUG
  81 #else
  82 #       undef DEBUG
  83 #endif
  84
  85 #include <linux/module.h>
  86 #include <linux/moduleparam.h>
  87 #include <linux/pci.h>
  88 #include <linux/kernel.h>
  89 #include <linux/delay.h>
  90 #include <linux/ioport.h>
  91 #include <linux/sched.h>
  92 #include <linux/slab.h>
  93 #include <linux/smp_lock.h>
  94 #include <linux/errno.h>
  95 #include <linux/init.h>
  96 #include <linux/timer.h>
  97 #include <linux/list.h>
  98 #include <linux/interrupt.h>  /* for in_interrupt () */
  99 #include <linux/usb.h>
 100 #include <linux/usb_otg.h>
 101 #include "../core/hcd.h"
 102 #include <linux/dma-mapping.h>
 103 #include <linux/dmapool.h>    /* needed by ohci-mem.c when no PCI */
 104
 105 #include <asm/io.h>
 106 #include <asm/irq.h>
 107 #include <asm/system.h>
 108 #include <asm/unaligned.h>
 109 #include <asm/byteorder.h>
 110
 111
 112 #define DRIVER_VERSION "2004 Nov 08"
 113 #define DRIVER_AUTHOR "Roman Weissgaerber, David Brownell"
 114 #define DRIVER_DESC "USB 1.1 'Open' Host Controller (OHCI) Driver"
 115
 116 /*-------------------------------------------------------------------------*/
 117
 118 // #define OHCI_VERBOSE_DEBUG   /* not always helpful */
 119
 120 /* For initializing controller (mask in an HCFS mode too) */
 121 #define OHCI_CONTROL_INIT       OHCI_CTRL_CBSR
 122 #define OHCI_INTR_INIT \
 123         (OHCI_INTR_MIE | OHCI_INTR_UE | OHCI_INTR_RD | OHCI_INTR_WDH)
 124
 125 #ifdef __hppa__
 126 /* On PA-RISC, PDC can leave IR set incorrectly; ignore it there. */
 127 #define IR_DISABLE
 128 #endif
 129
 130 #ifdef CONFIG_ARCH_OMAP
 131 /* OMAP doesn't support IR (no SMM; not needed) */
 132 #define IR_DISABLE
 133 #endif
 134
 135 /*-------------------------------------------------------------------------*/
 136
 137 static const char       hcd_name [] = "ohci_hcd";
 138
 139 #include "ohci.h"
 140
 141 static void ohci_dump (struct ohci_hcd *ohci, int verbose);
 142 static int ohci_init (struct ohci_hcd *ohci);
 143 static void ohci_stop (struct usb_hcd *hcd);
 144
 145 #include "ohci-hub.c"
 146 #include "ohci-dbg.c"
 147 #include "ohci-mem.c"
 148 #include "ohci-q.c"
 149
 150
 151 /*
 152  * On architectures with edge-triggered interrupts we must never return
 153  * IRQ_NONE.
 154  */
 155 #if defined(CONFIG_SA1111)  /* ... or other edge-triggered systems */
 156 #define IRQ_NOTMINE     IRQ_HANDLED
 157 #else
 158 #define IRQ_NOTMINE     IRQ_NONE
 159 #endif
 160
 161
 162 /* Some boards misreport power switching/overcurrent */
 163 static int distrust_firmware = 1;
 164 module_param (distrust_firmware, bool, 0);
 165 MODULE_PARM_DESC (distrust_firmware,
 166         "true to distrust firmware power/overcurrent setup");
 167
 168 /* Some boards leave IR set wrongly, since they fail BIOS/SMM handshakes */
 169 static int no_handshake = 0;
 170 module_param (no_handshake, bool, 0);
 171 MODULE_PARM_DESC (no_handshake, "true (not default) disables BIOS handshake");
 172
 173 /*-------------------------------------------------------------------------*/
 174
 175 /*
 176  * queue up an urb for anything except the root hub
 177  */
 178 static int ohci_urb_enqueue (
 179         struct usb_hcd  *hcd,
 180         struct usb_host_endpoint *ep,
 181         struct urb      *urb,
 182         int             mem_flags
 183 ) {
 184         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 185         struct ed       *ed;
 186         urb_priv_t      *urb_priv;
 187         unsigned int    pipe = urb->pipe;
 188         int             i, size = 0;
 189         unsigned long   flags;
 190         int             retval = 0;
 191
 192 #ifdef OHCI_VERBOSE_DEBUG
 193         urb_print (urb, "SUB", usb_pipein (pipe));
 194 #endif
 195
 196         /* every endpoint has a ed, locate and maybe (re)initialize it */
 197         if (! (ed = ed_get (ohci, ep, urb->dev, pipe, urb->interval)))
 198                 return -ENOMEM;
 199
 200         /* for the private part of the URB we need the number of TDs (size) */
 201         switch (ed->type) {
 202                 case PIPE_CONTROL:
 203                         /* td_submit_urb() doesn't yet handle these */
 204                         if (urb->transfer_buffer_length > 4096)
 205                                 return -EMSGSIZE;
 206
 207                         /* 1 TD for setup, 1 for ACK, plus ... */
 208                         size = 2;
 209                         /* FALLTHROUGH */
 210                 // case PIPE_INTERRUPT:
 211                 // case PIPE_BULK:
 212                 default:
 213                         /* one TD for every 4096 Bytes (can be upto 8K) */
 214                         size += urb->transfer_buffer_length / 4096;
 215                         /* ... and for any remaining bytes ... */
 216                         if ((urb->transfer_buffer_length % 4096) != 0)
 217                                 size++;
 218                         /* ... and maybe a zero length packet to wrap it up */
 219                         if (size == 0)
 220                                 size++;
 221                         else if ((urb->transfer_flags & URB_ZERO_PACKET) != 0
 222                                 && (urb->transfer_buffer_length
 223                                         % usb_maxpacket (urb->dev, pipe,
 224                                                 usb_pipeout (pipe))) == 0)
 225                                 size++;
 226                         break;
 227                 case PIPE_ISOCHRONOUS: /* number of packets from URB */
 228                         size = urb->number_of_packets;
 229                         break;
 230         }
 231
 232         /* allocate the private part of the URB */
 233         urb_priv = kmalloc (sizeof (urb_priv_t) + size * sizeof (struct td *),
 234                         mem_flags);
 235         if (!urb_priv)
 236                 return -ENOMEM;
 237         memset (urb_priv, 0, sizeof (urb_priv_t) + size * sizeof (struct td *));
 238         INIT_LIST_HEAD (&urb_priv->pending);
 239         urb_priv->length = size;
 240         urb_priv->ed = ed;
 241
 242         /* allocate the TDs (deferring hash chain updates) */
 243         for (i = 0; i < size; i++) {
 244                 urb_priv->td [i] = td_alloc (ohci, mem_flags);
 245                 if (!urb_priv->td [i]) {
 246                         urb_priv->length = i;
 247                         urb_free_priv (ohci, urb_priv);
 248                         return -ENOMEM;
 249                 }
 250         }
 251
 252         spin_lock_irqsave (&ohci->lock, flags);
 253
 254         /* don't submit to a dead HC */
 255         if (!HC_IS_RUNNING(hcd->state)) {
 256                 retval = -ENODEV;
 257                 goto fail;
 258         }
 259
 260         /* in case of unlink-during-submit */
 261         spin_lock (&urb->lock);
 262         if (urb->status != -EINPROGRESS) {
 263                 spin_unlock (&urb->lock);
 264                 urb->hcpriv = urb_priv;
 265                 finish_urb (ohci, urb, NULL);
 266                 retval = 0;
 267                 goto fail;
 268         }
 269
 270         /* schedule the ed if needed */
 271         if (ed->state == ED_IDLE) {
 272                 retval = ed_schedule (ohci, ed);
 273                 if (retval < 0)
 274                         goto fail0;
 275                 if (ed->type == PIPE_ISOCHRONOUS) {
 276                         u16     frame = ohci_frame_no(ohci);
 277
 278                         /* delay a few frames before the first TD */
 279                         frame += max_t (u16, 8, ed->interval);
 280                         frame &= ~(ed->interval - 1);
 281                         frame |= ed->branch;
 282                         urb->start_frame = frame;
 283
 284                         /* yes, only URB_ISO_ASAP is supported, and
 285                          * urb->start_frame is never used as input.
 286                          */
 287                 }
 288         } else if (ed->type == PIPE_ISOCHRONOUS)
 289                 urb->start_frame = ed->last_iso + ed->interval;
 290
 291         /* fill the TDs and link them to the ed; and
 292          * enable that part of the schedule, if needed
 293          * and update count of queued periodic urbs
 294          */
 295         urb->hcpriv = urb_priv;
 296         td_submit_urb (ohci, urb);
 297
 298 fail0:
 299         spin_unlock (&urb->lock);
 300 fail:
 301         if (retval)
 302                 urb_free_priv (ohci, urb_priv);
 303         spin_unlock_irqrestore (&ohci->lock, flags);
 304         return retval;
 305 }
 306
 307 /*
 308  * decouple the URB from the HC queues (TDs, urb_priv); it's
 309  * already marked using urb->status.  reporting is always done
 310  * asynchronously, and we might be dealing with an urb that's
 311  * partially transferred, or an ED with other urbs being unlinked.
 312  */
 313 static int ohci_urb_dequeue (struct usb_hcd *hcd, struct urb *urb)
 314 {
 315         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
 316         unsigned long           flags;
 317
 318 #ifdef OHCI_VERBOSE_DEBUG
 319         urb_print (urb, "UNLINK", 1);
 320 #endif
 321
 322         spin_lock_irqsave (&ohci->lock, flags);
 323         if (HC_IS_RUNNING(hcd->state)) {
 324                 urb_priv_t  *urb_priv;
 325
 326                 /* Unless an IRQ completed the unlink while it was being
 327                  * handed to us, flag it for unlink and giveback, and force
 328                  * some upcoming INTR_SF to call finish_unlinks()
 329                  */
 330                 urb_priv = urb->hcpriv;
 331                 if (urb_priv) {
 332                         if (urb_priv->ed->state == ED_OPER)
 333                                 start_ed_unlink (ohci, urb_priv->ed);
 334                 }
 335         } else {
 336                 /*
 337                  * with HC dead, we won't respect hc queue pointers
 338                  * any more ... just clean up every urb's memory.
 339                  */
 340                 if (urb->hcpriv)
 341                         finish_urb (ohci, urb, NULL);
 342         }
 343         spin_unlock_irqrestore (&ohci->lock, flags);
 344         return 0;
 345 }
 346
 347 /*-------------------------------------------------------------------------*/
 348
 349 /* frees config/altsetting state for endpoints,
 350  * including ED memory, dummy TD, and bulk/intr data toggle
 351  */
 352
 353 static void
 354 ohci_endpoint_disable (struct usb_hcd *hcd, struct usb_host_endpoint *ep)
 355 {
 356         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
 357         unsigned long           flags;
 358         struct ed               *ed = ep->hcpriv;
 359         unsigned                limit = 1000;
 360
 361         /* ASSERT:  any requests/urbs are being unlinked */
 362         /* ASSERT:  nobody can be submitting urbs for this any more */
 363
 364         if (!ed)
 365                 return;
 366
 367 rescan:
 368         spin_lock_irqsave (&ohci->lock, flags);
 369
 370         if (!HC_IS_RUNNING (hcd->state)) {
 371 sanitize:
 372                 ed->state = ED_IDLE;
 373                 finish_unlinks (ohci, 0, NULL);
 374         }
 375
 376         switch (ed->state) {
 377         case ED_UNLINK:         /* wait for hw to finish? */
 378                 /* major IRQ delivery trouble loses INTR_SF too... */
 379                 if (limit-- == 0) {
 380                         ohci_warn (ohci, "IRQ INTR_SF lossage\n");
 381                         goto sanitize;
 382                 }
 383                 spin_unlock_irqrestore (&ohci->lock, flags);
 384                 set_current_state (TASK_UNINTERRUPTIBLE);
 385                 schedule_timeout (1);
 386                 goto rescan;
 387         case ED_IDLE:           /* fully unlinked */
 388                 if (list_empty (&ed->td_list)) {
 389                         td_free (ohci, ed->dummy);
 390                         ed_free (ohci, ed);
 391                         break;
 392                 }
 393                 /* else FALL THROUGH */
 394         default:
 395                 /* caller was supposed to have unlinked any requests;
 396                  * that's not our job.  can't recover; must leak ed.
 397                  */
 398                 ohci_err (ohci, "leak ed %p (#%02x) state %d%s\n",
 399                         ed, ep->desc.bEndpointAddress, ed->state,
 400                         list_empty (&ed->td_list) ? "" : " (has tds)");
 401                 td_free (ohci, ed->dummy);
 402                 break;
 403         }
 404         ep->hcpriv = NULL;
 405         spin_unlock_irqrestore (&ohci->lock, flags);
 406         return;
 407 }
 408
 409 static int ohci_get_frame (struct usb_hcd *hcd)
 410 {
 411         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
 412
 413         return ohci_frame_no(ohci);
 414 }
 415
 416 static void ohci_usb_reset (struct ohci_hcd *ohci)
 417 {
 418         ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
 419         ohci->hc_control &= OHCI_CTRL_RWC;
 420         ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 421 }
 422
 423 /*-------------------------------------------------------------------------*
 424  * HC functions
 425  *-------------------------------------------------------------------------*/
 426
 427 /* init memory, and kick BIOS/SMM off */
 428
 429 static int ohci_init (struct ohci_hcd *ohci)
 430 {
 431         int ret;
 432
 433         disable (ohci);
 434         ohci->regs = ohci_to_hcd(ohci)->regs;
 435         ohci->next_statechange = jiffies;
 436
 437 #ifndef IR_DISABLE
 438         /* SMM owns the HC?  not for long! */
 439         if (!no_handshake && ohci_readl (ohci,
 440                                         &ohci->regs->control) & OHCI_CTRL_IR) {
 441                 u32 temp;
 442
 443                 ohci_dbg (ohci, "USB HC TakeOver from BIOS/SMM\n");
 444
 445                 /* this timeout is arbitrary.  we make it long, so systems
 446                  * depending on usb keyboards may be usable even if the
 447                  * BIOS/SMM code seems pretty broken.
 448                  */
 449                 temp = 500;     /* arbitrary: five seconds */
 450
 451                 ohci_writel (ohci, OHCI_INTR_OC, &ohci->regs->intrenable);
 452                 ohci_writel (ohci, OHCI_OCR, &ohci->regs->cmdstatus);
 453                 while (ohci_readl (ohci, &ohci->regs->control) & OHCI_CTRL_IR) {
 454                         msleep (10);
 455                         if (--temp == 0) {
 456                                 ohci_err (ohci, "USB HC takeover failed!"
 457                                         "  (BIOS/SMM bug)\n");
 458                                 return -EBUSY;
 459                         }
 460                 }
 461                 ohci_usb_reset (ohci);
 462         }
 463 #endif
 464
 465         /* Disable HC interrupts */
 466         ohci_writel (ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
 467         // flush the writes
 468         (void) ohci_readl (ohci, &ohci->regs->control);
 469
 470         if (ohci->hcca)
 471                 return 0;
 472
 473         ohci->hcca = dma_alloc_coherent (ohci_to_hcd(ohci)->self.controller,
 474                         sizeof *ohci->hcca, &ohci->hcca_dma, 0);
 475         if (!ohci->hcca)
 476                 return -ENOMEM;
 477
 478         if ((ret = ohci_mem_init (ohci)) < 0)
 479                 ohci_stop (ohci_to_hcd(ohci));
 480
 481         return ret;
 482
 483 }
 484
 485 /*-------------------------------------------------------------------------*/
 486
 487 /* Start an OHCI controller, set the BUS operational
 488  * resets USB and controller
 489  * enable interrupts
 490  * connect the virtual root hub
 491  */
 492 static int ohci_run (struct ohci_hcd *ohci)
 493 {
 494         u32                     mask, temp;
 495         struct usb_device       *udev;
 496         struct usb_bus          *bus;
 497         int                     first = ohci->fminterval == 0;
 498
 499         disable (ohci);
 500
 501         /* boot firmware should have set this up (5.1.1.3.1) */
 502         if (first) {
 503
 504                 temp = ohci_readl (ohci, &ohci->regs->fminterval);
 505                 ohci->fminterval = temp & 0x3fff;
 506                 if (ohci->fminterval != FI)
 507                         ohci_dbg (ohci, "fminterval delta %d\n",
 508                                 ohci->fminterval - FI);
 509                 ohci->fminterval |= FSMP (ohci->fminterval) << 16;
 510                 /* also: power/overcurrent flags in roothub.a */
 511         }
 512
 513         /* Reset USB nearly "by the book".  RemoteWakeupConnected
 514          * saved if boot firmware (BIOS/SMM/...) told us it's connected
 515          * (for OHCI integrated on mainboard, it normally is)
 516          */
 517         ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
 518         ohci_dbg (ohci, "resetting from state '%s', control = 0x%x\n",
 519                         hcfs2string (ohci->hc_control & OHCI_CTRL_HCFS),
 520                         ohci->hc_control);
 521
 522         if (ohci->hc_control & OHCI_CTRL_RWC
 523                         && !(ohci->flags & OHCI_QUIRK_AMD756))
 524                 ohci_to_hcd(ohci)->can_wakeup = 1;
 525
 526         switch (ohci->hc_control & OHCI_CTRL_HCFS) {
 527         case OHCI_USB_OPER:
 528                 temp = 0;
 529                 break;
 530         case OHCI_USB_SUSPEND:
 531         case OHCI_USB_RESUME:
 532                 ohci->hc_control &= OHCI_CTRL_RWC;
 533                 ohci->hc_control |= OHCI_USB_RESUME;
 534                 temp = 10 /* msec wait */;
 535                 break;
 536         // case OHCI_USB_RESET:
 537         default:
 538                 ohci->hc_control &= OHCI_CTRL_RWC;
 539                 ohci->hc_control |= OHCI_USB_RESET;
 540                 temp = 50 /* msec wait */;
 541                 break;
 542         }
 543         ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 544         // flush the writes
 545         (void) ohci_readl (ohci, &ohci->regs->control);
 546         msleep(temp);
 547         temp = roothub_a (ohci);
 548         if (!(temp & RH_A_NPS)) {
 549                 unsigned ports = temp & RH_A_NDP;
 550
 551                 /* power down each port */
 552                 for (temp = 0; temp < ports; temp++)
 553                         ohci_writel (ohci, RH_PS_LSDA,
 554                                 &ohci->regs->roothub.portstatus [temp]);
 555         }
 556         // flush those writes
 557         (void) ohci_readl (ohci, &ohci->regs->control);
 558         memset (ohci->hcca, 0, sizeof (struct ohci_hcca));
 559
 560         /* 2msec timelimit here means no irqs/preempt */
 561         spin_lock_irq (&ohci->lock);
 562
 563 retry:
 564         /* HC Reset requires max 10 us delay */
 565         ohci_writel (ohci, OHCI_HCR,  &ohci->regs->cmdstatus);
 566         temp = 30;      /* ... allow extra time */
 567         while ((ohci_readl (ohci, &ohci->regs->cmdstatus) & OHCI_HCR) != 0) {
 568                 if (--temp == 0) {
 569                         spin_unlock_irq (&ohci->lock);
 570                         ohci_err (ohci, "USB HC reset timed out!\n");
 571                         return -1;
 572                 }
 573                 udelay (1);
 574         }
 575
 576         /* now we're in the SUSPEND state ... must go OPERATIONAL
 577          * within 2msec else HC enters RESUME
 578          *
 579          * ... but some hardware won't init fmInterval "by the book"
 580          * (SiS, OPTi ...), so reset again instead.  SiS doesn't need
 581          * this if we write fmInterval after we're OPERATIONAL.
 582          * Unclear about ALi, ServerWorks, and others ... this could
 583          * easily be a longstanding bug in chip init on Linux.
 584          */
 585         if (ohci->flags & OHCI_QUIRK_INITRESET) {
 586                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 587                 // flush those writes
 588                 (void) ohci_readl (ohci, &ohci->regs->control);
 589         }
 590
 591         /* Tell the controller where the control and bulk lists are
 592          * The lists are empty now. */
 593         ohci_writel (ohci, 0, &ohci->regs->ed_controlhead);
 594         ohci_writel (ohci, 0, &ohci->regs->ed_bulkhead);
 595
 596         /* a reset clears this */
 597         ohci_writel (ohci, (u32) ohci->hcca_dma, &ohci->regs->hcca);
 598
 599         periodic_reinit (ohci);
 600
 601         /* some OHCI implementations are finicky about how they init.
 602          * bogus values here mean not even enumeration could work.
 603          */
 604         if ((ohci_readl (ohci, &ohci->regs->fminterval) & 0x3fff0000) == 0
 605                         || !ohci_readl (ohci, &ohci->regs->periodicstart)) {
 606                 if (!(ohci->flags & OHCI_QUIRK_INITRESET)) {
 607                         ohci->flags |= OHCI_QUIRK_INITRESET;
 608                         ohci_dbg (ohci, "enabling initreset quirk\n");
 609                         goto retry;
 610                 }
 611                 spin_unlock_irq (&ohci->lock);
 612                 ohci_err (ohci, "init err (%08x %04x)\n",
 613                         ohci_readl (ohci, &ohci->regs->fminterval),
 614                         ohci_readl (ohci, &ohci->regs->periodicstart));
 615                 return -EOVERFLOW;
 616         }
 617
 618         /* start controller operations */
 619         ohci->hc_control &= OHCI_CTRL_RWC;
 620         ohci->hc_control |= OHCI_CONTROL_INIT | OHCI_USB_OPER;
 621         ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 622         ohci_to_hcd(ohci)->state = HC_STATE_RUNNING;
 623
 624         /* wake on ConnectStatusChange, matching external hubs */
 625         ohci_writel (ohci, RH_HS_DRWE, &ohci->regs->roothub.status);
 626
 627         /* Choose the interrupts we care about now, others later on demand */
 628         mask = OHCI_INTR_INIT;
 629         ohci_writel (ohci, mask, &ohci->regs->intrstatus);
 630         ohci_writel (ohci, mask, &ohci->regs->intrenable);
 631
 632         /* handle root hub init quirks ... */
 633         temp = roothub_a (ohci);
 634         temp &= ~(RH_A_PSM | RH_A_OCPM);
 635         if (ohci->flags & OHCI_QUIRK_SUPERIO) {
 636                 /* NSC 87560 and maybe others */
 637                 temp |= RH_A_NOCP;
 638                 temp &= ~(RH_A_POTPGT | RH_A_NPS);
 639                 ohci_writel (ohci, temp, &ohci->regs->roothub.a);
 640         } else if ((ohci->flags & OHCI_QUIRK_AMD756) || distrust_firmware) {
 641                 /* hub power always on; required for AMD-756 and some
 642                  * Mac platforms.  ganged overcurrent reporting, if any.
 643                  */
 644                 temp |= RH_A_NPS;
 645                 ohci_writel (ohci, temp, &ohci->regs->roothub.a);
 646         }
 647         ohci_writel (ohci, RH_HS_LPSC, &ohci->regs->roothub.status);
 648         ohci_writel (ohci, (temp & RH_A_NPS) ? 0 : RH_B_PPCM,
 649                                                 &ohci->regs->roothub.b);
 650         // flush those writes
 651         (void) ohci_readl (ohci, &ohci->regs->control);
 652
 653         spin_unlock_irq (&ohci->lock);
 654
 655         // POTPGT delay is bits 24-31, in 2 ms units.
 656         mdelay ((temp >> 23) & 0x1fe);
 657         bus = &ohci_to_hcd(ohci)->self;
 658         ohci_to_hcd(ohci)->state = HC_STATE_RUNNING;
 659
 660         ohci_dump (ohci, 1);
 661
 662         udev = bus->root_hub;
 663         if (udev) {
 664                 return 0;
 665         }
 666
 667         /* connect the virtual root hub */
 668         udev = usb_alloc_dev (NULL, bus, 0);
 669         if (!udev) {
 670                 disable (ohci);
 671                 ohci->hc_control &= ~OHCI_CTRL_HCFS;
 672                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 673                 return -ENOMEM;
 674         }
 675
 676         udev->speed = USB_SPEED_FULL;
 677         if (usb_hcd_register_root_hub (udev, ohci_to_hcd(ohci)) != 0) {
 678                 usb_put_dev (udev);
 679                 disable (ohci);
 680                 ohci->hc_control &= ~OHCI_CTRL_HCFS;
 681                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 682                 return -ENODEV;
 683         }
 684         if (ohci->power_budget)
 685                 hub_set_power_budget(udev, ohci->power_budget);
 686
 687         create_debug_files (ohci);
 688         return 0;
 689 }
 690
 691 /*-------------------------------------------------------------------------*/
 692
 693 /* an interrupt happens */
 694
 695 static irqreturn_t ohci_irq (struct usb_hcd *hcd, struct pt_regs *ptregs)
 696 {
 697         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
 698         struct ohci_regs __iomem *regs = ohci->regs;
 699         int                     ints;
 700
 701         /* we can eliminate a (slow) ohci_readl()
 702            if _only_ WDH caused this irq */
 703         if ((ohci->hcca->done_head != 0)
 704                         && ! (hc32_to_cpup (ohci, &ohci->hcca->done_head)
 705                                 & 0x01)) {
 706                 ints =  OHCI_INTR_WDH;
 707
 708         /* cardbus/... hardware gone before remove() */
 709         } else if ((ints = ohci_readl (ohci, &regs->intrstatus)) == ~(u32)0) {
 710                 disable (ohci);
 711                 ohci_dbg (ohci, "device removed!\n");
 712                 return IRQ_HANDLED;
 713
 714         /* interrupt for some other device? */
 715         } else if ((ints &= ohci_readl (ohci, &regs->intrenable)) == 0) {
 716                 return IRQ_NOTMINE;
 717         }
 718
 719         if (ints & OHCI_INTR_UE) {
 720                 disable (ohci);
 721                 ohci_err (ohci, "OHCI Unrecoverable Error, disabled\n");
 722                 // e.g. due to PCI Master/Target Abort
 723
 724                 ohci_dump (ohci, 1);
 725                 ohci_usb_reset (ohci);
 726         }
 727
 728         if (ints & OHCI_INTR_RD) {
 729                 ohci_vdbg (ohci, "resume detect\n");
 730                 if (hcd->state != HC_STATE_QUIESCING)
 731                         schedule_work(&ohci->rh_resume);
 732         }
 733
 734         if (ints & OHCI_INTR_WDH) {
 735                 if (HC_IS_RUNNING(hcd->state))
 736                         ohci_writel (ohci, OHCI_INTR_WDH, &regs->intrdisable);
 737                 spin_lock (&ohci->lock);
 738                 dl_done_list (ohci, ptregs);
 739                 spin_unlock (&ohci->lock);
 740                 if (HC_IS_RUNNING(hcd->state))
 741                         ohci_writel (ohci, OHCI_INTR_WDH, &regs->intrenable);
 742         }
 743
 744         /* could track INTR_SO to reduce available PCI/... bandwidth */
 745
 746         /* handle any pending URB/ED unlinks, leaving INTR_SF enabled
 747          * when there's still unlinking to be done (next frame).
 748          */
 749         spin_lock (&ohci->lock);
 750         if (ohci->ed_rm_list)
 751                 finish_unlinks (ohci, ohci_frame_no(ohci), ptregs);
 752         if ((ints & OHCI_INTR_SF) != 0 && !ohci->ed_rm_list
 753                         && HC_IS_RUNNING(hcd->state))
 754                 ohci_writel (ohci, OHCI_INTR_SF, &regs->intrdisable);
 755         spin_unlock (&ohci->lock);
 756
 757         if (HC_IS_RUNNING(hcd->state)) {
 758                 ohci_writel (ohci, ints, &regs->intrstatus);
 759                 ohci_writel (ohci, OHCI_INTR_MIE, &regs->intrenable);
 760                 // flush those writes
 761                 (void) ohci_readl (ohci, &ohci->regs->control);
 762         }
 763
 764         return IRQ_HANDLED;
 765 }
 766
 767 /*-------------------------------------------------------------------------*/
 768
 769 static void ohci_stop (struct usb_hcd *hcd)
 770 {
 771         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
 772
 773         ohci_dbg (ohci, "stop %s controller (state 0x%02x)\n",
 774                 hcfs2string (ohci->hc_control & OHCI_CTRL_HCFS),
 775                 hcd->state);
 776         ohci_dump (ohci, 1);
 777
 778         flush_scheduled_work();
 779
 780         ohci_usb_reset (ohci);
 781         ohci_writel (ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
 782
 783         remove_debug_files (ohci);
 784         ohci_mem_cleanup (ohci);
 785         if (ohci->hcca) {
 786                 dma_free_coherent (hcd->self.controller,
 787                                 sizeof *ohci->hcca,
 788                                 ohci->hcca, ohci->hcca_dma);
 789                 ohci->hcca = NULL;
 790                 ohci->hcca_dma = 0;
 791         }
 792 }
 793
 794 /*-------------------------------------------------------------------------*/
 795
 796 /* must not be called from interrupt context */
 797
 798 #if     defined(CONFIG_USB_SUSPEND) || defined(CONFIG_PM)
 799
 800 static int ohci_restart (struct ohci_hcd *ohci)
 801 {
 802         int temp;
 803         int i;
 804         struct urb_priv *priv;
 805         struct usb_device *root = ohci_to_hcd(ohci)->self.root_hub;
 806
 807         /* mark any devices gone, so they do nothing till khubd disconnects.
 808          * recycle any "live" eds/tds (and urbs) right away.
 809          * later, khubd disconnect processing will recycle the other state,
 810          * (either as disconnect/reconnect, or maybe someday as a reset).
 811          */
 812         spin_lock_irq(&ohci->lock);
 813         disable (ohci);
 814         for (i = 0; i < root->maxchild; i++) {
 815                 if (root->children [i])
 816                         usb_set_device_state (root->children[i],
 817                                 USB_STATE_NOTATTACHED);
 818         }
 819         if (!list_empty (&ohci->pending))
 820                 ohci_dbg(ohci, "abort schedule...\n");
 821         list_for_each_entry (priv, &ohci->pending, pending) {
 822                 struct urb      *urb = priv->td[0]->urb;
 823                 struct ed       *ed = priv->ed;
 824
 825                 switch (ed->state) {
 826                 case ED_OPER:
 827                         ed->state = ED_UNLINK;
 828                         ed->hwINFO |= cpu_to_hc32(ohci, ED_DEQUEUE);
 829                         ed_deschedule (ohci, ed);
 830
 831                         ed->ed_next = ohci->ed_rm_list;
 832                         ed->ed_prev = NULL;
 833                         ohci->ed_rm_list = ed;
 834                         /* FALLTHROUGH */
 835                 case ED_UNLINK:
 836                         break;
 837                 default:
 838                         ohci_dbg(ohci, "bogus ed %p state %d\n",
 839                                         ed, ed->state);
 840                 }
 841
 842                 spin_lock (&urb->lock);
 843                 urb->status = -ESHUTDOWN;
 844                 spin_unlock (&urb->lock);
 845         }
 846         finish_unlinks (ohci, 0, NULL);
 847         spin_unlock_irq(&ohci->lock);
 848
 849         /* paranoia, in case that didn't work: */
 850
 851         /* empty the interrupt branches */
 852         for (i = 0; i < NUM_INTS; i++) ohci->load [i] = 0;
 853         for (i = 0; i < NUM_INTS; i++) ohci->hcca->int_table [i] = 0;
 854
 855         /* no EDs to remove */
 856         ohci->ed_rm_list = NULL;
 857
 858         /* empty control and bulk lists */
 859         ohci->ed_controltail = NULL;
 860         ohci->ed_bulktail    = NULL;
 861
 862         if ((temp = ohci_run (ohci)) < 0) {
 863                 ohci_err (ohci, "can't restart, %d\n", temp);
 864                 return temp;
 865         } else {
 866                 /* here we "know" root ports should always stay powered,
 867                  * and that if we try to turn them back on the root hub
 868                  * will respond to CSC processing.
 869                  */
 870                 i = roothub_a (ohci) & RH_A_NDP;
 871                 while (i--)
 872                         ohci_writel (ohci, RH_PS_PSS,
 873                                 &ohci->regs->roothub.portstatus [temp]);
 874                 ohci_dbg (ohci, "restart complete\n");
 875         }
 876         return 0;
 877 }
 878 #endif
 879
 880 /*-------------------------------------------------------------------------*/
 881
 882 #define DRIVER_INFO DRIVER_VERSION " " DRIVER_DESC
 883
 884 MODULE_AUTHOR (DRIVER_AUTHOR);
 885 MODULE_DESCRIPTION (DRIVER_INFO);
 886 MODULE_LICENSE ("GPL");
 887
 888 #ifdef CONFIG_PCI
 889 #include "ohci-pci.c"
 890 #endif
 891
 892 #ifdef CONFIG_SA1111
 893 #include "ohci-sa1111.c"
 894 #endif
 895
 896 #ifdef CONFIG_ARCH_OMAP
 897 #include "ohci-omap.c"
 898 #endif
 899
 900 #ifdef CONFIG_ARCH_LH7A404
 901 #include "ohci-lh7a404.c"
 902 #endif
 903
 904 #ifdef CONFIG_PXA27x
 905 #include "ohci-pxa27x.c"
 906 #endif
 907
 908 #ifdef CONFIG_SOC_AU1X00
 909 #include "ohci-au1xxx.c"
 910 #endif
 911
 912 #ifdef CONFIG_USB_OHCI_HCD_PPC_SOC
 913 #include "ohci-ppc-soc.c"
 914 #endif
 915
 916 #if !(defined(CONFIG_PCI) \
 917       || defined(CONFIG_SA1111) \
 918       || defined(CONFIG_ARCH_OMAP) \
 919       || defined (CONFIG_ARCH_LH7A404) \
 920       || defined (CONFIG_PXA27x) \
 921       || defined (CONFIG_SOC_AU1X00) \
 922       || defined (CONFIG_USB_OHCI_HCD_PPC_SOC) \
 923         )
 924 #error "missing bus glue for ohci-hcd"
 925 #endif