git.oblomov.eu Git - linux-2.6/blob - drivers/usb/host/uhci-q.c

   1 /*
   2  * Universal Host Controller Interface driver for USB.
   3  *
   4  * Maintainer: Alan Stern <stern@rowland.harvard.edu>
   5  *
   6  * (C) Copyright 1999 Linus Torvalds
   7  * (C) Copyright 1999-2002 Johannes Erdfelt, johannes@erdfelt.com
   8  * (C) Copyright 1999 Randy Dunlap
   9  * (C) Copyright 1999 Georg Acher, acher@in.tum.de
  10  * (C) Copyright 1999 Deti Fliegl, deti@fliegl.de
  11  * (C) Copyright 1999 Thomas Sailer, sailer@ife.ee.ethz.ch
  12  * (C) Copyright 1999 Roman Weissgaerber, weissg@vienna.at
  13  * (C) Copyright 2000 Yggdrasil Computing, Inc. (port of new PCI interface
  14  *               support from usb-ohci.c by Adam Richter, adam@yggdrasil.com).
  15  * (C) Copyright 1999 Gregory P. Smith (from usb-ohci.c)
  16  * (C) Copyright 2004 Alan Stern, stern@rowland.harvard.edu
  17  */
  18
  19 static int uhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb);
  20 static void uhci_unlink_generic(struct uhci_hcd *uhci, struct urb *urb);
  21 static void uhci_remove_pending_urbps(struct uhci_hcd *uhci);
  22 static void uhci_free_pending_qhs(struct uhci_hcd *uhci);
  23 static void uhci_free_pending_tds(struct uhci_hcd *uhci);
  24
  25 /*
  26  * Technically, updating td->status here is a race, but it's not really a
  27  * problem. The worst that can happen is that we set the IOC bit again
  28  * generating a spurious interrupt. We could fix this by creating another
  29  * QH and leaving the IOC bit always set, but then we would have to play
  30  * games with the FSBR code to make sure we get the correct order in all
  31  * the cases. I don't think it's worth the effort
  32  */
  33 static inline void uhci_set_next_interrupt(struct uhci_hcd *uhci)
  34 {
  35         if (uhci->is_stopped)
  36                 mod_timer(&uhci->stall_timer, jiffies);
  37         uhci->term_td->status |= cpu_to_le32(TD_CTRL_IOC);
  38 }
  39
  40 static inline void uhci_clear_next_interrupt(struct uhci_hcd *uhci)
  41 {
  42         uhci->term_td->status &= ~cpu_to_le32(TD_CTRL_IOC);
  43 }
  44
  45 static inline void uhci_moveto_complete(struct uhci_hcd *uhci,
  46                                         struct urb_priv *urbp)
  47 {
  48         list_move_tail(&urbp->urb_list, &uhci->complete_list);
  49 }
  50
  51 static struct uhci_td *uhci_alloc_td(struct uhci_hcd *uhci, struct usb_device *dev)
  52 {
  53         dma_addr_t dma_handle;
  54         struct uhci_td *td;
  55
  56         td = dma_pool_alloc(uhci->td_pool, GFP_ATOMIC, &dma_handle);
  57         if (!td)
  58                 return NULL;
  59
  60         td->dma_handle = dma_handle;
  61
  62         td->link = UHCI_PTR_TERM;
  63         td->buffer = 0;
  64
  65         td->frame = -1;
  66         td->dev = dev;
  67
  68         INIT_LIST_HEAD(&td->list);
  69         INIT_LIST_HEAD(&td->remove_list);
  70         INIT_LIST_HEAD(&td->fl_list);
  71
  72         usb_get_dev(dev);
  73
  74         return td;
  75 }
  76
  77 static inline void uhci_fill_td(struct uhci_td *td, u32 status,
  78                 u32 token, u32 buffer)
  79 {
  80         td->status = cpu_to_le32(status);
  81         td->token = cpu_to_le32(token);
  82         td->buffer = cpu_to_le32(buffer);
  83 }
  84
  85 /*
  86  * We insert Isochronous URB's directly into the frame list at the beginning
  87  */
  88 static void uhci_insert_td_frame_list(struct uhci_hcd *uhci, struct uhci_td *td, unsigned framenum)
  89 {
  90         framenum &= (UHCI_NUMFRAMES - 1);
  91
  92         td->frame = framenum;
  93
  94         /* Is there a TD already mapped there? */
  95         if (uhci->fl->frame_cpu[framenum]) {
  96                 struct uhci_td *ftd, *ltd;
  97
  98                 ftd = uhci->fl->frame_cpu[framenum];
  99                 ltd = list_entry(ftd->fl_list.prev, struct uhci_td, fl_list);
 100
 101                 list_add_tail(&td->fl_list, &ftd->fl_list);
 102
 103                 td->link = ltd->link;
 104                 wmb();
 105                 ltd->link = cpu_to_le32(td->dma_handle);
 106         } else {
 107                 td->link = uhci->fl->frame[framenum];
 108                 wmb();
 109                 uhci->fl->frame[framenum] = cpu_to_le32(td->dma_handle);
 110                 uhci->fl->frame_cpu[framenum] = td;
 111         }
 112 }
 113
 114 static void uhci_remove_td(struct uhci_hcd *uhci, struct uhci_td *td)
 115 {
 116         /* If it's not inserted, don't remove it */
 117         if (td->frame == -1 && list_empty(&td->fl_list))
 118                 return;
 119
 120         if (td->frame != -1 && uhci->fl->frame_cpu[td->frame] == td) {
 121                 if (list_empty(&td->fl_list)) {
 122                         uhci->fl->frame[td->frame] = td->link;
 123                         uhci->fl->frame_cpu[td->frame] = NULL;
 124                 } else {
 125                         struct uhci_td *ntd;
 126
 127                         ntd = list_entry(td->fl_list.next, struct uhci_td, fl_list);
 128                         uhci->fl->frame[td->frame] = cpu_to_le32(ntd->dma_handle);
 129                         uhci->fl->frame_cpu[td->frame] = ntd;
 130                 }
 131         } else {
 132                 struct uhci_td *ptd;
 133
 134                 ptd = list_entry(td->fl_list.prev, struct uhci_td, fl_list);
 135                 ptd->link = td->link;
 136         }
 137
 138         wmb();
 139         td->link = UHCI_PTR_TERM;
 140
 141         list_del_init(&td->fl_list);
 142         td->frame = -1;
 143 }
 144
 145 /*
 146  * Inserts a td list into qh.
 147  */
 148 static void uhci_insert_tds_in_qh(struct uhci_qh *qh, struct urb *urb, __le32 breadth)
 149 {
 150         struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
 151         struct uhci_td *td;
 152         __le32 *plink;
 153
 154         /* Ordering isn't important here yet since the QH hasn't been */
 155         /* inserted into the schedule yet */
 156         plink = &qh->element;
 157         list_for_each_entry(td, &urbp->td_list, list) {
 158                 *plink = cpu_to_le32(td->dma_handle) | breadth;
 159                 plink = &td->link;
 160         }
 161         *plink = UHCI_PTR_TERM;
 162 }
 163
 164 static void uhci_free_td(struct uhci_hcd *uhci, struct uhci_td *td)
 165 {
 166         if (!list_empty(&td->list))
 167                 dev_warn(uhci_dev(uhci), "td %p still in list!\n", td);
 168         if (!list_empty(&td->remove_list))
 169                 dev_warn(uhci_dev(uhci), "td %p still in remove_list!\n", td);
 170         if (!list_empty(&td->fl_list))
 171                 dev_warn(uhci_dev(uhci), "td %p still in fl_list!\n", td);
 172
 173         if (td->dev)
 174                 usb_put_dev(td->dev);
 175
 176         dma_pool_free(uhci->td_pool, td, td->dma_handle);
 177 }
 178
 179 static struct uhci_qh *uhci_alloc_qh(struct uhci_hcd *uhci, struct usb_device *dev)
 180 {
 181         dma_addr_t dma_handle;
 182         struct uhci_qh *qh;
 183
 184         qh = dma_pool_alloc(uhci->qh_pool, GFP_ATOMIC, &dma_handle);
 185         if (!qh)
 186                 return NULL;
 187
 188         qh->dma_handle = dma_handle;
 189
 190         qh->element = UHCI_PTR_TERM;
 191         qh->link = UHCI_PTR_TERM;
 192
 193         qh->dev = dev;
 194         qh->urbp = NULL;
 195
 196         INIT_LIST_HEAD(&qh->list);
 197         INIT_LIST_HEAD(&qh->remove_list);
 198
 199         usb_get_dev(dev);
 200
 201         return qh;
 202 }
 203
 204 static void uhci_free_qh(struct uhci_hcd *uhci, struct uhci_qh *qh)
 205 {
 206         if (!list_empty(&qh->list))
 207                 dev_warn(uhci_dev(uhci), "qh %p list not empty!\n", qh);
 208         if (!list_empty(&qh->remove_list))
 209                 dev_warn(uhci_dev(uhci), "qh %p still in remove_list!\n", qh);
 210
 211         if (qh->dev)
 212                 usb_put_dev(qh->dev);
 213
 214         dma_pool_free(uhci->qh_pool, qh, qh->dma_handle);
 215 }
 216
 217 /*
 218  * Append this urb's qh after the last qh in skelqh->list
 219  *
 220  * Note that urb_priv.queue_list doesn't have a separate queue head;
 221  * it's a ring with every element "live".
 222  */
 223 static void uhci_insert_qh(struct uhci_hcd *uhci, struct uhci_qh *skelqh, struct urb *urb)
 224 {
 225         struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
 226         struct urb_priv *turbp;
 227         struct uhci_qh *lqh;
 228
 229         /* Grab the last QH */
 230         lqh = list_entry(skelqh->list.prev, struct uhci_qh, list);
 231
 232         /* Point to the next skelqh */
 233         urbp->qh->link = lqh->link;
 234         wmb();                          /* Ordering is important */
 235
 236         /*
 237          * Patch QHs for previous endpoint's queued URBs?  HC goes
 238          * here next, not to the next skelqh it now points to.
 239          *
 240          *    lqh --> td ... --> qh ... --> td --> qh ... --> td
 241          *     |                 |                 |
 242          *     v                 v                 v
 243          *     +<----------------+-----------------+
 244          *     v
 245          *    newqh --> td ... --> td
 246          *     |
 247          *     v
 248          *    ...
 249          *
 250          * The HC could see (and use!) any of these as we write them.
 251          */
 252         lqh->link = cpu_to_le32(urbp->qh->dma_handle) | UHCI_PTR_QH;
 253         if (lqh->urbp) {
 254                 list_for_each_entry(turbp, &lqh->urbp->queue_list, queue_list)
 255                         turbp->qh->link = lqh->link;
 256         }
 257
 258         list_add_tail(&urbp->qh->list, &skelqh->list);
 259 }
 260
 261 /*
 262  * Start removal of QH from schedule; it finishes next frame.
 263  * TDs should be unlinked before this is called.
 264  */
 265 static void uhci_remove_qh(struct uhci_hcd *uhci, struct uhci_qh *qh)
 266 {
 267         struct uhci_qh *pqh;
 268         __le32 newlink;
 269
 270         if (!qh)
 271                 return;
 272
 273         /*
 274          * Only go through the hoops if it's actually linked in
 275          */
 276         if (!list_empty(&qh->list)) {
 277
 278                 /* If our queue is nonempty, make the next URB the head */
 279                 if (!list_empty(&qh->urbp->queue_list)) {
 280                         struct urb_priv *nurbp;
 281
 282                         nurbp = list_entry(qh->urbp->queue_list.next,
 283                                         struct urb_priv, queue_list);
 284                         nurbp->queued = 0;
 285                         list_add(&nurbp->qh->list, &qh->list);
 286                         newlink = cpu_to_le32(nurbp->qh->dma_handle) | UHCI_PTR_QH;
 287                 } else
 288                         newlink = qh->link;
 289
 290                 /* Fix up the previous QH's queue to link to either
 291                  * the new head of this queue or the start of the
 292                  * next endpoint's queue. */
 293                 pqh = list_entry(qh->list.prev, struct uhci_qh, list);
 294                 pqh->link = newlink;
 295                 if (pqh->urbp) {
 296                         struct urb_priv *turbp;
 297
 298                         list_for_each_entry(turbp, &pqh->urbp->queue_list,
 299                                         queue_list)
 300                                 turbp->qh->link = newlink;
 301                 }
 302                 wmb();
 303
 304                 /* Leave qh->link in case the HC is on the QH now, it will */
 305                 /* continue the rest of the schedule */
 306                 qh->element = UHCI_PTR_TERM;
 307
 308                 list_del_init(&qh->list);
 309         }
 310
 311         list_del_init(&qh->urbp->queue_list);
 312         qh->urbp = NULL;
 313
 314         uhci_get_current_frame_number(uhci);
 315         if (uhci->frame_number + uhci->is_stopped != uhci->qh_remove_age) {
 316                 uhci_free_pending_qhs(uhci);
 317                 uhci->qh_remove_age = uhci->frame_number;
 318         }
 319
 320         /* Check to see if the remove list is empty. Set the IOC bit */
 321         /* to force an interrupt so we can remove the QH */
 322         if (list_empty(&uhci->qh_remove_list))
 323                 uhci_set_next_interrupt(uhci);
 324
 325         list_add(&qh->remove_list, &uhci->qh_remove_list);
 326 }
 327
 328 static int uhci_fixup_toggle(struct urb *urb, unsigned int toggle)
 329 {
 330         struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
 331         struct uhci_td *td;
 332
 333         list_for_each_entry(td, &urbp->td_list, list) {
 334                 if (toggle)
 335                         td->token |= cpu_to_le32(TD_TOKEN_TOGGLE);
 336                 else
 337                         td->token &= ~cpu_to_le32(TD_TOKEN_TOGGLE);
 338
 339                 toggle ^= 1;
 340         }
 341
 342         return toggle;
 343 }
 344
 345 /* This function will append one URB's QH to another URB's QH. This is for */
 346 /* queuing interrupt, control or bulk transfers */
 347 static void uhci_append_queued_urb(struct uhci_hcd *uhci, struct urb *eurb, struct urb *urb)
 348 {
 349         struct urb_priv *eurbp, *urbp, *furbp, *lurbp;
 350         struct uhci_td *lltd;
 351
 352         eurbp = eurb->hcpriv;
 353         urbp = urb->hcpriv;
 354
 355         /* Find the first URB in the queue */
 356         furbp = eurbp;
 357         if (eurbp->queued) {
 358                 list_for_each_entry(furbp, &eurbp->queue_list, queue_list)
 359                         if (!furbp->queued)
 360                                 break;
 361         }
 362
 363         lurbp = list_entry(furbp->queue_list.prev, struct urb_priv, queue_list);
 364
 365         lltd = list_entry(lurbp->td_list.prev, struct uhci_td, list);
 366
 367         /* Control transfers always start with toggle 0 */
 368         if (!usb_pipecontrol(urb->pipe))
 369                 usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
 370                                 usb_pipeout(urb->pipe),
 371                                 uhci_fixup_toggle(urb,
 372                                         uhci_toggle(td_token(lltd)) ^ 1));
 373
 374         /* All qh's in the queue need to link to the next queue */
 375         urbp->qh->link = eurbp->qh->link;
 376
 377         wmb();                  /* Make sure we flush everything */
 378
 379         lltd->link = cpu_to_le32(urbp->qh->dma_handle) | UHCI_PTR_QH;
 380
 381         list_add_tail(&urbp->queue_list, &furbp->queue_list);
 382
 383         urbp->queued = 1;
 384 }
 385
 386 static void uhci_delete_queued_urb(struct uhci_hcd *uhci, struct urb *urb)
 387 {
 388         struct urb_priv *urbp, *nurbp, *purbp, *turbp;
 389         struct uhci_td *pltd;
 390         unsigned int toggle;
 391
 392         urbp = urb->hcpriv;
 393
 394         if (list_empty(&urbp->queue_list))
 395                 return;
 396
 397         nurbp = list_entry(urbp->queue_list.next, struct urb_priv, queue_list);
 398
 399         /*
 400          * Fix up the toggle for the following URBs in the queue.
 401          * Only needed for bulk and interrupt: control and isochronous
 402          * endpoints don't propagate toggles between messages.
 403          */
 404         if (usb_pipebulk(urb->pipe) || usb_pipeint(urb->pipe)) {
 405                 if (!urbp->queued)
 406                         /* We just set the toggle in uhci_unlink_generic */
 407                         toggle = usb_gettoggle(urb->dev,
 408                                         usb_pipeendpoint(urb->pipe),
 409                                         usb_pipeout(urb->pipe));
 410                 else {
 411                         /* If we're in the middle of the queue, grab the */
 412                         /* toggle from the TD previous to us */
 413                         purbp = list_entry(urbp->queue_list.prev,
 414                                         struct urb_priv, queue_list);
 415                         pltd = list_entry(purbp->td_list.prev,
 416                                         struct uhci_td, list);
 417                         toggle = uhci_toggle(td_token(pltd)) ^ 1;
 418                 }
 419
 420                 list_for_each_entry(turbp, &urbp->queue_list, queue_list) {
 421                         if (!turbp->queued)
 422                                 break;
 423                         toggle = uhci_fixup_toggle(turbp->urb, toggle);
 424                 }
 425
 426                 usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
 427                                 usb_pipeout(urb->pipe), toggle);
 428         }
 429
 430         if (urbp->queued) {
 431                 /* We're somewhere in the middle (or end).  The case where
 432                  * we're at the head is handled in uhci_remove_qh(). */
 433                 purbp = list_entry(urbp->queue_list.prev, struct urb_priv,
 434                                 queue_list);
 435
 436                 pltd = list_entry(purbp->td_list.prev, struct uhci_td, list);
 437                 if (nurbp->queued)
 438                         pltd->link = cpu_to_le32(nurbp->qh->dma_handle) | UHCI_PTR_QH;
 439                 else
 440                         /* The next URB happens to be the beginning, so */
 441                         /*  we're the last, end the chain */
 442                         pltd->link = UHCI_PTR_TERM;
 443         }
 444
 445         /* urbp->queue_list is handled in uhci_remove_qh() */
 446 }
 447
 448 static struct urb_priv *uhci_alloc_urb_priv(struct uhci_hcd *uhci, struct urb *urb)
 449 {
 450         struct urb_priv *urbp;
 451
 452         urbp = kmem_cache_alloc(uhci_up_cachep, SLAB_ATOMIC);
 453         if (!urbp)
 454                 return NULL;
 455
 456         memset((void *)urbp, 0, sizeof(*urbp));
 457
 458         urbp->inserttime = jiffies;
 459         urbp->fsbrtime = jiffies;
 460         urbp->urb = urb;
 461
 462         INIT_LIST_HEAD(&urbp->td_list);
 463         INIT_LIST_HEAD(&urbp->queue_list);
 464         INIT_LIST_HEAD(&urbp->urb_list);
 465
 466         list_add_tail(&urbp->urb_list, &uhci->urb_list);
 467
 468         urb->hcpriv = urbp;
 469
 470         return urbp;
 471 }
 472
 473 static void uhci_add_td_to_urb(struct urb *urb, struct uhci_td *td)
 474 {
 475         struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
 476
 477         td->urb = urb;
 478
 479         list_add_tail(&td->list, &urbp->td_list);
 480 }
 481
 482 static void uhci_remove_td_from_urb(struct uhci_td *td)
 483 {
 484         if (list_empty(&td->list))
 485                 return;
 486
 487         list_del_init(&td->list);
 488
 489         td->urb = NULL;
 490 }
 491
 492 static void uhci_destroy_urb_priv(struct uhci_hcd *uhci, struct urb *urb)
 493 {
 494         struct uhci_td *td, *tmp;
 495         struct urb_priv *urbp;
 496
 497         urbp = (struct urb_priv *)urb->hcpriv;
 498         if (!urbp)
 499                 return;
 500
 501         if (!list_empty(&urbp->urb_list))
 502                 dev_warn(uhci_dev(uhci), "urb %p still on uhci->urb_list "
 503                                 "or uhci->remove_list!\n", urb);
 504
 505         uhci_get_current_frame_number(uhci);
 506         if (uhci->frame_number + uhci->is_stopped != uhci->td_remove_age) {
 507                 uhci_free_pending_tds(uhci);
 508                 uhci->td_remove_age = uhci->frame_number;
 509         }
 510
 511         /* Check to see if the remove list is empty. Set the IOC bit */
 512         /* to force an interrupt so we can remove the TD's*/
 513         if (list_empty(&uhci->td_remove_list))
 514                 uhci_set_next_interrupt(uhci);
 515
 516         list_for_each_entry_safe(td, tmp, &urbp->td_list, list) {
 517                 uhci_remove_td_from_urb(td);
 518                 uhci_remove_td(uhci, td);
 519                 list_add(&td->remove_list, &uhci->td_remove_list);
 520         }
 521
 522         urb->hcpriv = NULL;
 523         kmem_cache_free(uhci_up_cachep, urbp);
 524 }
 525
 526 static void uhci_inc_fsbr(struct uhci_hcd *uhci, struct urb *urb)
 527 {
 528         struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
 529
 530         if ((!(urb->transfer_flags & URB_NO_FSBR)) && !urbp->fsbr) {
 531                 urbp->fsbr = 1;
 532                 if (!uhci->fsbr++ && !uhci->fsbrtimeout)
 533                         uhci->skel_term_qh->link = cpu_to_le32(uhci->skel_fs_control_qh->dma_handle) | UHCI_PTR_QH;
 534         }
 535 }
 536
 537 static void uhci_dec_fsbr(struct uhci_hcd *uhci, struct urb *urb)
 538 {
 539         struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
 540
 541         if ((!(urb->transfer_flags & URB_NO_FSBR)) && urbp->fsbr) {
 542                 urbp->fsbr = 0;
 543                 if (!--uhci->fsbr)
 544                         uhci->fsbrtimeout = jiffies + FSBR_DELAY;
 545         }
 546 }
 547
 548 /*
 549  * Map status to standard result codes
 550  *
 551  * <status> is (td_status(td) & 0xF60000), a.k.a.
 552  * uhci_status_bits(td_status(td)).
 553  * Note: <status> does not include the TD_CTRL_NAK bit.
 554  * <dir_out> is True for output TDs and False for input TDs.
 555  */
 556 static int uhci_map_status(int status, int dir_out)
 557 {
 558         if (!status)
 559                 return 0;
 560         if (status & TD_CTRL_BITSTUFF)                  /* Bitstuff error */
 561                 return -EPROTO;
 562         if (status & TD_CTRL_CRCTIMEO) {                /* CRC/Timeout */
 563                 if (dir_out)
 564                         return -EPROTO;
 565                 else
 566                         return -EILSEQ;
 567         }
 568         if (status & TD_CTRL_BABBLE)                    /* Babble */
 569                 return -EOVERFLOW;
 570         if (status & TD_CTRL_DBUFERR)                   /* Buffer error */
 571                 return -ENOSR;
 572         if (status & TD_CTRL_STALLED)                   /* Stalled */
 573                 return -EPIPE;
 574         WARN_ON(status & TD_CTRL_ACTIVE);               /* Active */
 575         return 0;
 576 }
 577
 578 /*
 579  * Control transfers
 580  */
 581 static int uhci_submit_control(struct uhci_hcd *uhci, struct urb *urb, struct urb *eurb)
 582 {
 583         struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
 584         struct uhci_td *td;
 585         struct uhci_qh *qh, *skelqh;
 586         unsigned long destination, status;
 587         int maxsze = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe));
 588         int len = urb->transfer_buffer_length;
 589         dma_addr_t data = urb->transfer_dma;
 590
 591         /* The "pipe" thing contains the destination in bits 8--18 */
 592         destination = (urb->pipe & PIPE_DEVEP_MASK) | USB_PID_SETUP;
 593
 594         /* 3 errors */
 595         status = TD_CTRL_ACTIVE | uhci_maxerr(3);
 596         if (urb->dev->speed == USB_SPEED_LOW)
 597                 status |= TD_CTRL_LS;
 598
 599         /*
 600          * Build the TD for the control request setup packet
 601          */
 602         td = uhci_alloc_td(uhci, urb->dev);
 603         if (!td)
 604                 return -ENOMEM;
 605
 606         uhci_add_td_to_urb(urb, td);
 607         uhci_fill_td(td, status, destination | uhci_explen(7),
 608                 urb->setup_dma);
 609
 610         /*
 611          * If direction is "send", change the packet ID from SETUP (0x2D)
 612          * to OUT (0xE1).  Else change it from SETUP to IN (0x69) and
 613          * set Short Packet Detect (SPD) for all data packets.
 614          */
 615         if (usb_pipeout(urb->pipe))
 616                 destination ^= (USB_PID_SETUP ^ USB_PID_OUT);
 617         else {
 618                 destination ^= (USB_PID_SETUP ^ USB_PID_IN);
 619                 status |= TD_CTRL_SPD;
 620         }
 621
 622         /*
 623          * Build the DATA TD's
 624          */
 625         while (len > 0) {
 626                 int pktsze = len;
 627
 628                 if (pktsze > maxsze)
 629                         pktsze = maxsze;
 630
 631                 td = uhci_alloc_td(uhci, urb->dev);
 632                 if (!td)
 633                         return -ENOMEM;
 634
 635                 /* Alternate Data0/1 (start with Data1) */
 636                 destination ^= TD_TOKEN_TOGGLE;
 637
 638                 uhci_add_td_to_urb(urb, td);
 639                 uhci_fill_td(td, status, destination | uhci_explen(pktsze - 1),
 640                         data);
 641
 642                 data += pktsze;
 643                 len -= pktsze;
 644         }
 645
 646         /*
 647          * Build the final TD for control status
 648          */
 649         td = uhci_alloc_td(uhci, urb->dev);
 650         if (!td)
 651                 return -ENOMEM;
 652
 653         /*
 654          * It's IN if the pipe is an output pipe or we're not expecting
 655          * data back.
 656          */
 657         destination &= ~TD_TOKEN_PID_MASK;
 658         if (usb_pipeout(urb->pipe) || !urb->transfer_buffer_length)
 659                 destination |= USB_PID_IN;
 660         else
 661                 destination |= USB_PID_OUT;
 662
 663         destination |= TD_TOKEN_TOGGLE;         /* End in Data1 */
 664
 665         status &= ~TD_CTRL_SPD;
 666
 667         uhci_add_td_to_urb(urb, td);
 668         uhci_fill_td(td, status | TD_CTRL_IOC,
 669                 destination | uhci_explen(UHCI_NULL_DATA_SIZE), 0);
 670
 671         qh = uhci_alloc_qh(uhci, urb->dev);
 672         if (!qh)
 673                 return -ENOMEM;
 674
 675         urbp->qh = qh;
 676         qh->urbp = urbp;
 677
 678         uhci_insert_tds_in_qh(qh, urb, UHCI_PTR_BREADTH);
 679
 680         /* Low-speed transfers get a different queue, and won't hog the bus.
 681          * Also, some devices enumerate better without FSBR; the easiest way
 682          * to do that is to put URBs on the low-speed queue while the device
 683          * is in the DEFAULT state. */
 684         if (urb->dev->speed == USB_SPEED_LOW ||
 685                         urb->dev->state == USB_STATE_DEFAULT)
 686                 skelqh = uhci->skel_ls_control_qh;
 687         else {
 688                 skelqh = uhci->skel_fs_control_qh;
 689                 uhci_inc_fsbr(uhci, urb);
 690         }
 691
 692         if (eurb)
 693                 uhci_append_queued_urb(uhci, eurb, urb);
 694         else
 695                 uhci_insert_qh(uhci, skelqh, urb);
 696
 697         return -EINPROGRESS;
 698 }
 699
 700 /*
 701  * If control-IN transfer was short, the status packet wasn't sent.
 702  * This routine changes the element pointer in the QH to point at the
 703  * status TD.  It's safe to do this even while the QH is live, because
 704  * the hardware only updates the element pointer following a successful
 705  * transfer.  The inactive TD for the short packet won't cause an update,
 706  * so the pointer won't get overwritten.  The next time the controller
 707  * sees this QH, it will send the status packet.
 708  */
 709 static int usb_control_retrigger_status(struct uhci_hcd *uhci, struct urb *urb)
 710 {
 711         struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
 712         struct uhci_td *td;
 713
 714         urbp->short_control_packet = 1;
 715
 716         td = list_entry(urbp->td_list.prev, struct uhci_td, list);
 717         urbp->qh->element = cpu_to_le32(td->dma_handle);
 718
 719         return -EINPROGRESS;
 720 }
 721
 722
 723 static int uhci_result_control(struct uhci_hcd *uhci, struct urb *urb)
 724 {
 725         struct list_head *tmp, *head;
 726         struct urb_priv *urbp = urb->hcpriv;
 727         struct uhci_td *td;
 728         unsigned int status;
 729         int ret = 0;
 730
 731         if (list_empty(&urbp->td_list))
 732                 return -EINVAL;
 733
 734         head = &urbp->td_list;
 735
 736         if (urbp->short_control_packet) {
 737                 tmp = head->prev;
 738                 goto status_stage;
 739         }
 740
 741         tmp = head->next;
 742         td = list_entry(tmp, struct uhci_td, list);
 743
 744         /* The first TD is the SETUP stage, check the status, but skip */
 745         /*  the count */
 746         status = uhci_status_bits(td_status(td));
 747         if (status & TD_CTRL_ACTIVE)
 748                 return -EINPROGRESS;
 749
 750         if (status)
 751                 goto td_error;
 752
 753         urb->actual_length = 0;
 754
 755         /* The rest of the TD's (but the last) are data */
 756         tmp = tmp->next;
 757         while (tmp != head && tmp->next != head) {
 758                 unsigned int ctrlstat;
 759
 760                 td = list_entry(tmp, struct uhci_td, list);
 761                 tmp = tmp->next;
 762
 763                 ctrlstat = td_status(td);
 764                 status = uhci_status_bits(ctrlstat);
 765                 if (status & TD_CTRL_ACTIVE)
 766                         return -EINPROGRESS;
 767
 768                 urb->actual_length += uhci_actual_length(ctrlstat);
 769
 770                 if (status)
 771                         goto td_error;
 772
 773                 /* Check to see if we received a short packet */
 774                 if (uhci_actual_length(ctrlstat) <
 775                                 uhci_expected_length(td_token(td))) {
 776                         if (urb->transfer_flags & URB_SHORT_NOT_OK) {
 777                                 ret = -EREMOTEIO;
 778                                 goto err;
 779                         }
 780
 781                         if (uhci_packetid(td_token(td)) == USB_PID_IN)
 782                                 return usb_control_retrigger_status(uhci, urb);
 783                         else
 784                                 return 0;
 785                 }
 786         }
 787
 788 status_stage:
 789         td = list_entry(tmp, struct uhci_td, list);
 790
 791         /* Control status stage */
 792         status = td_status(td);
 793
 794 #ifdef I_HAVE_BUGGY_APC_BACKUPS
 795         /* APC BackUPS Pro kludge */
 796         /* It tries to send all of the descriptor instead of the amount */
 797         /*  we requested */
 798         if (status & TD_CTRL_IOC &&     /* IOC is masked out by uhci_status_bits */
 799             status & TD_CTRL_ACTIVE &&
 800             status & TD_CTRL_NAK)
 801                 return 0;
 802 #endif
 803
 804         status = uhci_status_bits(status);
 805         if (status & TD_CTRL_ACTIVE)
 806                 return -EINPROGRESS;
 807
 808         if (status)
 809                 goto td_error;
 810
 811         return 0;
 812
 813 td_error:
 814         ret = uhci_map_status(status, uhci_packetout(td_token(td)));
 815
 816 err:
 817         if ((debug == 1 && ret != -EPIPE) || debug > 1) {
 818                 /* Some debugging code */
 819                 dev_dbg(uhci_dev(uhci), "%s: failed with status %x\n",
 820                                 __FUNCTION__, status);
 821
 822                 if (errbuf) {
 823                         /* Print the chain for debugging purposes */
 824                         uhci_show_qh(urbp->qh, errbuf, ERRBUF_LEN, 0);
 825
 826                         lprintk(errbuf);
 827                 }
 828         }
 829
 830         return ret;
 831 }
 832
 833 /*
 834  * Common submit for bulk and interrupt
 835  */
 836 static int uhci_submit_common(struct uhci_hcd *uhci, struct urb *urb, struct urb *eurb, struct uhci_qh *skelqh)
 837 {
 838         struct uhci_td *td;
 839         struct uhci_qh *qh;
 840         unsigned long destination, status;
 841         int maxsze = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe));
 842         int len = urb->transfer_buffer_length;
 843         struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
 844         dma_addr_t data = urb->transfer_dma;
 845
 846         if (len < 0)
 847                 return -EINVAL;
 848
 849         /* The "pipe" thing contains the destination in bits 8--18 */
 850         destination = (urb->pipe & PIPE_DEVEP_MASK) | usb_packetid(urb->pipe);
 851
 852         status = uhci_maxerr(3) | TD_CTRL_ACTIVE;
 853         if (urb->dev->speed == USB_SPEED_LOW)
 854                 status |= TD_CTRL_LS;
 855         if (usb_pipein(urb->pipe))
 856                 status |= TD_CTRL_SPD;
 857
 858         /*
 859          * Build the DATA TD's
 860          */
 861         do {    /* Allow zero length packets */
 862                 int pktsze = maxsze;
 863
 864                 if (pktsze >= len) {
 865                         pktsze = len;
 866                         if (!(urb->transfer_flags & URB_SHORT_NOT_OK))
 867                                 status &= ~TD_CTRL_SPD;
 868                 }
 869
 870                 td = uhci_alloc_td(uhci, urb->dev);
 871                 if (!td)
 872                         return -ENOMEM;
 873
 874                 uhci_add_td_to_urb(urb, td);
 875                 uhci_fill_td(td, status, destination | uhci_explen(pktsze - 1) |
 876                         (usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe),
 877                          usb_pipeout(urb->pipe)) << TD_TOKEN_TOGGLE_SHIFT),
 878                         data);
 879
 880                 data += pktsze;
 881                 len -= maxsze;
 882
 883                 usb_dotoggle(urb->dev, usb_pipeendpoint(urb->pipe),
 884                         usb_pipeout(urb->pipe));
 885         } while (len > 0);
 886
 887         /*
 888          * URB_ZERO_PACKET means adding a 0-length packet, if direction
 889          * is OUT and the transfer_length was an exact multiple of maxsze,
 890          * hence (len = transfer_length - N * maxsze) == 0
 891          * however, if transfer_length == 0, the zero packet was already
 892          * prepared above.
 893          */
 894         if (usb_pipeout(urb->pipe) && (urb->transfer_flags & URB_ZERO_PACKET) &&
 895             !len && urb->transfer_buffer_length) {
 896                 td = uhci_alloc_td(uhci, urb->dev);
 897                 if (!td)
 898                         return -ENOMEM;
 899
 900                 uhci_add_td_to_urb(urb, td);
 901                 uhci_fill_td(td, status, destination | uhci_explen(UHCI_NULL_DATA_SIZE) |
 902                         (usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe),
 903                          usb_pipeout(urb->pipe)) << TD_TOKEN_TOGGLE_SHIFT),
 904                         data);
 905
 906                 usb_dotoggle(urb->dev, usb_pipeendpoint(urb->pipe),
 907                         usb_pipeout(urb->pipe));
 908         }
 909
 910         /* Set the interrupt-on-completion flag on the last packet.
 911          * A more-or-less typical 4 KB URB (= size of one memory page)
 912          * will require about 3 ms to transfer; that's a little on the
 913          * fast side but not enough to justify delaying an interrupt
 914          * more than 2 or 3 URBs, so we will ignore the URB_NO_INTERRUPT
 915          * flag setting. */
 916         td->status |= cpu_to_le32(TD_CTRL_IOC);
 917
 918         qh = uhci_alloc_qh(uhci, urb->dev);
 919         if (!qh)
 920                 return -ENOMEM;
 921
 922         urbp->qh = qh;
 923         qh->urbp = urbp;
 924
 925         /* Always breadth first */
 926         uhci_insert_tds_in_qh(qh, urb, UHCI_PTR_BREADTH);
 927
 928         if (eurb)
 929                 uhci_append_queued_urb(uhci, eurb, urb);
 930         else
 931                 uhci_insert_qh(uhci, skelqh, urb);
 932
 933         return -EINPROGRESS;
 934 }
 935
 936 /*
 937  * Common result for bulk and interrupt
 938  */
 939 static int uhci_result_common(struct uhci_hcd *uhci, struct urb *urb)
 940 {
 941         struct urb_priv *urbp = urb->hcpriv;
 942         struct uhci_td *td;
 943         unsigned int status = 0;
 944         int ret = 0;
 945
 946         urb->actual_length = 0;
 947
 948         list_for_each_entry(td, &urbp->td_list, list) {
 949                 unsigned int ctrlstat = td_status(td);
 950
 951                 status = uhci_status_bits(ctrlstat);
 952                 if (status & TD_CTRL_ACTIVE)
 953                         return -EINPROGRESS;
 954
 955                 urb->actual_length += uhci_actual_length(ctrlstat);
 956
 957                 if (status)
 958                         goto td_error;
 959
 960                 if (uhci_actual_length(ctrlstat) <
 961                                 uhci_expected_length(td_token(td))) {
 962                         if (urb->transfer_flags & URB_SHORT_NOT_OK) {
 963                                 ret = -EREMOTEIO;
 964                                 goto err;
 965                         } else
 966                                 return 0;
 967                 }
 968         }
 969
 970         return 0;
 971
 972 td_error:
 973         ret = uhci_map_status(status, uhci_packetout(td_token(td)));
 974
 975 err:
 976         /*
 977          * Enable this chunk of code if you want to see some more debugging.
 978          * But be careful, it has the tendancy to starve out khubd and prevent
 979          * disconnects from happening successfully if you have a slow debug
 980          * log interface (like a serial console.
 981          */
 982 #if 0
 983         if ((debug == 1 && ret != -EPIPE) || debug > 1) {
 984                 /* Some debugging code */
 985                 dev_dbg(uhci_dev(uhci), "%s: failed with status %x\n",
 986                                 __FUNCTION__, status);
 987
 988                 if (errbuf) {
 989                         /* Print the chain for debugging purposes */
 990                         uhci_show_qh(urbp->qh, errbuf, ERRBUF_LEN, 0);
 991
 992                         lprintk(errbuf);
 993                 }
 994         }
 995 #endif
 996         return ret;
 997 }
 998
 999 static inline int uhci_submit_bulk(struct uhci_hcd *uhci, struct urb *urb, struct urb *eurb)
1000 {
1001         int ret;
1002
1003         /* Can't have low-speed bulk transfers */
1004         if (urb->dev->speed == USB_SPEED_LOW)
1005                 return -EINVAL;
1006
1007         ret = uhci_submit_common(uhci, urb, eurb, uhci->skel_bulk_qh);
1008         if (ret == -EINPROGRESS)
1009                 uhci_inc_fsbr(uhci, urb);
1010
1011         return ret;
1012 }
1013
1014 static inline int uhci_submit_interrupt(struct uhci_hcd *uhci, struct urb *urb, struct urb *eurb)
1015 {
1016         /* USB 1.1 interrupt transfers only involve one packet per interval;
1017          * that's the uhci_submit_common() "breadth first" policy.  Drivers
1018          * can submit urbs of any length, but longer ones might need many
1019          * intervals to complete.
1020          */
1021         return uhci_submit_common(uhci, urb, eurb, uhci->skelqh[__interval_to_skel(urb->interval)]);
1022 }
1023
1024 /*
1025  * Isochronous transfers
1026  */
1027 static int isochronous_find_limits(struct uhci_hcd *uhci, struct urb *urb, unsigned int *start, unsigned int *end)
1028 {
1029         struct urb *last_urb = NULL;
1030         struct urb_priv *up;
1031         int ret = 0;
1032
1033         list_for_each_entry(up, &uhci->urb_list, urb_list) {
1034                 struct urb *u = up->urb;
1035
1036                 /* look for pending URB's with identical pipe handle */
1037                 if ((urb->pipe == u->pipe) && (urb->dev == u->dev) &&
1038                     (u->status == -EINPROGRESS) && (u != urb)) {
1039                         if (!last_urb)
1040                                 *start = u->start_frame;
1041                         last_urb = u;
1042                 }
1043         }
1044
1045         if (last_urb) {
1046                 *end = (last_urb->start_frame + last_urb->number_of_packets *
1047                                 last_urb->interval) & (UHCI_NUMFRAMES-1);
1048                 ret = 0;
1049         } else
1050                 ret = -1;       /* no previous urb found */
1051
1052         return ret;
1053 }
1054
1055 static int isochronous_find_start(struct uhci_hcd *uhci, struct urb *urb)
1056 {
1057         int limits;
1058         unsigned int start = 0, end = 0;
1059
1060         if (urb->number_of_packets > 900)       /* 900? Why? */
1061                 return -EFBIG;
1062
1063         limits = isochronous_find_limits(uhci, urb, &start, &end);
1064
1065         if (urb->transfer_flags & URB_ISO_ASAP) {
1066                 if (limits) {
1067                         uhci_get_current_frame_number(uhci);
1068                         urb->start_frame = (uhci->frame_number + 10)
1069                                         & (UHCI_NUMFRAMES - 1);
1070                 } else
1071                         urb->start_frame = end;
1072         } else {
1073                 urb->start_frame &= (UHCI_NUMFRAMES - 1);
1074                 /* FIXME: Sanity check */
1075         }
1076
1077         return 0;
1078 }
1079
1080 /*
1081  * Isochronous transfers
1082  */
1083 static int uhci_submit_isochronous(struct uhci_hcd *uhci, struct urb *urb)
1084 {
1085         struct uhci_td *td;
1086         int i, ret, frame;
1087         int status, destination;
1088
1089         status = TD_CTRL_ACTIVE | TD_CTRL_IOS;
1090         destination = (urb->pipe & PIPE_DEVEP_MASK) | usb_packetid(urb->pipe);
1091
1092         ret = isochronous_find_start(uhci, urb);
1093         if (ret)
1094                 return ret;
1095
1096         frame = urb->start_frame;
1097         for (i = 0; i < urb->number_of_packets; i++, frame += urb->interval) {
1098                 if (!urb->iso_frame_desc[i].length)
1099                         continue;
1100
1101                 td = uhci_alloc_td(uhci, urb->dev);
1102                 if (!td)
1103                         return -ENOMEM;
1104
1105                 uhci_add_td_to_urb(urb, td);
1106                 uhci_fill_td(td, status, destination | uhci_explen(urb->iso_frame_desc[i].length - 1),
1107                         urb->transfer_dma + urb->iso_frame_desc[i].offset);
1108
1109                 if (i + 1 >= urb->number_of_packets)
1110                         td->status |= cpu_to_le32(TD_CTRL_IOC);
1111
1112                 uhci_insert_td_frame_list(uhci, td, frame);
1113         }
1114
1115         return -EINPROGRESS;
1116 }
1117
1118 static int uhci_result_isochronous(struct uhci_hcd *uhci, struct urb *urb)
1119 {
1120         struct uhci_td *td;
1121         struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
1122         int status;
1123         int i, ret = 0;
1124
1125         urb->actual_length = 0;
1126
1127         i = 0;
1128         list_for_each_entry(td, &urbp->td_list, list) {
1129                 int actlength;
1130                 unsigned int ctrlstat = td_status(td);
1131
1132                 if (ctrlstat & TD_CTRL_ACTIVE)
1133                         return -EINPROGRESS;
1134
1135                 actlength = uhci_actual_length(ctrlstat);
1136                 urb->iso_frame_desc[i].actual_length = actlength;
1137                 urb->actual_length += actlength;
1138
1139                 status = uhci_map_status(uhci_status_bits(ctrlstat),
1140                                 usb_pipeout(urb->pipe));
1141                 urb->iso_frame_desc[i].status = status;
1142                 if (status) {
1143                         urb->error_count++;
1144                         ret = status;
1145                 }
1146
1147                 i++;
1148         }
1149
1150         return ret;
1151 }
1152
1153 static struct urb *uhci_find_urb_ep(struct uhci_hcd *uhci, struct urb *urb)
1154 {
1155         struct urb_priv *up;
1156
1157         /* We don't match Isoc transfers since they are special */
1158         if (usb_pipeisoc(urb->pipe))
1159                 return NULL;
1160
1161         list_for_each_entry(up, &uhci->urb_list, urb_list) {
1162                 struct urb *u = up->urb;
1163
1164                 if (u->dev == urb->dev && u->status == -EINPROGRESS) {
1165                         /* For control, ignore the direction */
1166                         if (usb_pipecontrol(urb->pipe) &&
1167                             (u->pipe & ~USB_DIR_IN) == (urb->pipe & ~USB_DIR_IN))
1168                                 return u;
1169                         else if (u->pipe == urb->pipe)
1170                                 return u;
1171                 }
1172         }
1173
1174         return NULL;
1175 }
1176
1177 static int uhci_urb_enqueue(struct usb_hcd *hcd,
1178                 struct usb_host_endpoint *ep,
1179                 struct urb *urb, int mem_flags)
1180 {
1181         int ret;
1182         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
1183         unsigned long flags;
1184         struct urb *eurb;
1185         int bustime;
1186
1187         spin_lock_irqsave(&uhci->lock, flags);
1188
1189         ret = urb->status;
1190         if (ret != -EINPROGRESS)                /* URB already unlinked! */
1191                 goto out;
1192
1193         eurb = uhci_find_urb_ep(uhci, urb);
1194
1195         if (!uhci_alloc_urb_priv(uhci, urb)) {
1196                 ret = -ENOMEM;
1197                 goto out;
1198         }
1199
1200         switch (usb_pipetype(urb->pipe)) {
1201         case PIPE_CONTROL:
1202                 ret = uhci_submit_control(uhci, urb, eurb);
1203                 break;
1204         case PIPE_INTERRUPT:
1205                 if (!eurb) {
1206                         bustime = usb_check_bandwidth(urb->dev, urb);
1207                         if (bustime < 0)
1208                                 ret = bustime;
1209                         else {
1210                                 ret = uhci_submit_interrupt(uhci, urb, eurb);
1211                                 if (ret == -EINPROGRESS)
1212                                         usb_claim_bandwidth(urb->dev, urb, bustime, 0);
1213                         }
1214                 } else {        /* inherit from parent */
1215                         urb->bandwidth = eurb->bandwidth;
1216                         ret = uhci_submit_interrupt(uhci, urb, eurb);
1217                 }
1218                 break;
1219         case PIPE_BULK:
1220                 ret = uhci_submit_bulk(uhci, urb, eurb);
1221                 break;
1222         case PIPE_ISOCHRONOUS:
1223                 bustime = usb_check_bandwidth(urb->dev, urb);
1224                 if (bustime < 0) {
1225                         ret = bustime;
1226                         break;
1227                 }
1228
1229                 ret = uhci_submit_isochronous(uhci, urb);
1230                 if (ret == -EINPROGRESS)
1231                         usb_claim_bandwidth(urb->dev, urb, bustime, 1);
1232                 break;
1233         }
1234
1235         if (ret != -EINPROGRESS) {
1236                 /* Submit failed, so delete it from the urb_list */
1237                 struct urb_priv *urbp = urb->hcpriv;
1238
1239                 list_del_init(&urbp->urb_list);
1240                 uhci_destroy_urb_priv(uhci, urb);
1241         } else
1242                 ret = 0;
1243
1244 out:
1245         spin_unlock_irqrestore(&uhci->lock, flags);
1246         return ret;
1247 }
1248
1249 /*
1250  * Return the result of a transfer
1251  */
1252 static void uhci_transfer_result(struct uhci_hcd *uhci, struct urb *urb)
1253 {
1254         int ret = -EINPROGRESS;
1255         struct urb_priv *urbp;
1256
1257         spin_lock(&urb->lock);
1258
1259         urbp = (struct urb_priv *)urb->hcpriv;
1260
1261         if (urb->status != -EINPROGRESS)        /* URB already dequeued */
1262                 goto out;
1263
1264         switch (usb_pipetype(urb->pipe)) {
1265         case PIPE_CONTROL:
1266                 ret = uhci_result_control(uhci, urb);
1267                 break;
1268         case PIPE_BULK:
1269         case PIPE_INTERRUPT:
1270                 ret = uhci_result_common(uhci, urb);
1271                 break;
1272         case PIPE_ISOCHRONOUS:
1273                 ret = uhci_result_isochronous(uhci, urb);
1274                 break;
1275         }
1276
1277         if (ret == -EINPROGRESS)
1278                 goto out;
1279         urb->status = ret;
1280
1281         switch (usb_pipetype(urb->pipe)) {
1282         case PIPE_CONTROL:
1283         case PIPE_BULK:
1284         case PIPE_ISOCHRONOUS:
1285                 /* Release bandwidth for Interrupt or Isoc. transfers */
1286                 if (urb->bandwidth)
1287                         usb_release_bandwidth(urb->dev, urb, 1);
1288                 uhci_unlink_generic(uhci, urb);
1289                 break;
1290         case PIPE_INTERRUPT:
1291                 /* Release bandwidth for Interrupt or Isoc. transfers */
1292                 /* Make sure we don't release if we have a queued URB */
1293                 if (list_empty(&urbp->queue_list) && urb->bandwidth)
1294                         usb_release_bandwidth(urb->dev, urb, 0);
1295                 else
1296                         /* bandwidth was passed on to queued URB, */
1297                         /* so don't let usb_unlink_urb() release it */
1298                         urb->bandwidth = 0;
1299                 uhci_unlink_generic(uhci, urb);
1300                 break;
1301         default:
1302                 dev_info(uhci_dev(uhci), "%s: unknown pipe type %d "
1303                                 "for urb %p\n",
1304                                 __FUNCTION__, usb_pipetype(urb->pipe), urb);
1305         }
1306
1307         /* Move it from uhci->urb_list to uhci->complete_list */
1308         uhci_moveto_complete(uhci, urbp);
1309
1310 out:
1311         spin_unlock(&urb->lock);
1312 }
1313
1314 static void uhci_unlink_generic(struct uhci_hcd *uhci, struct urb *urb)
1315 {
1316         struct list_head *head;
1317         struct uhci_td *td;
1318         struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
1319         int prevactive = 0;
1320
1321         uhci_dec_fsbr(uhci, urb);       /* Safe since it checks */
1322
1323         /*
1324          * Now we need to find out what the last successful toggle was
1325          * so we can update the local data toggle for the next transfer
1326          *
1327          * There are 2 ways the last successful completed TD is found:
1328          *
1329          * 1) The TD is NOT active and the actual length < expected length
1330          * 2) The TD is NOT active and it's the last TD in the chain
1331          *
1332          * and a third way the first uncompleted TD is found:
1333          *
1334          * 3) The TD is active and the previous TD is NOT active
1335          *
1336          * Control and Isochronous ignore the toggle, so this is safe
1337          * for all types
1338          *
1339          * FIXME: The toggle fixups won't be 100% reliable until we
1340          * change over to using a single queue for each endpoint and
1341          * stop the queue before unlinking.
1342          */
1343         head = &urbp->td_list;
1344         list_for_each_entry(td, head, list) {
1345                 unsigned int ctrlstat = td_status(td);
1346
1347                 if (!(ctrlstat & TD_CTRL_ACTIVE) &&
1348                                 (uhci_actual_length(ctrlstat) <
1349                                  uhci_expected_length(td_token(td)) ||
1350                                 td->list.next == head))
1351                         usb_settoggle(urb->dev, uhci_endpoint(td_token(td)),
1352                                 uhci_packetout(td_token(td)),
1353                                 uhci_toggle(td_token(td)) ^ 1);
1354                 else if ((ctrlstat & TD_CTRL_ACTIVE) && !prevactive)
1355                         usb_settoggle(urb->dev, uhci_endpoint(td_token(td)),
1356                                 uhci_packetout(td_token(td)),
1357                                 uhci_toggle(td_token(td)));
1358
1359                 prevactive = ctrlstat & TD_CTRL_ACTIVE;
1360         }
1361
1362         uhci_delete_queued_urb(uhci, urb);
1363
1364         /* The interrupt loop will reclaim the QH's */
1365         uhci_remove_qh(uhci, urbp->qh);
1366         urbp->qh = NULL;
1367 }
1368
1369 static int uhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb)
1370 {
1371         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
1372         unsigned long flags;
1373         struct urb_priv *urbp;
1374
1375         spin_lock_irqsave(&uhci->lock, flags);
1376         urbp = urb->hcpriv;
1377         if (!urbp)                      /* URB was never linked! */
1378                 goto done;
1379         list_del_init(&urbp->urb_list);
1380
1381         uhci_unlink_generic(uhci, urb);
1382
1383         uhci_get_current_frame_number(uhci);
1384         if (uhci->frame_number + uhci->is_stopped != uhci->urb_remove_age) {
1385                 uhci_remove_pending_urbps(uhci);
1386                 uhci->urb_remove_age = uhci->frame_number;
1387         }
1388
1389         /* If we're the first, set the next interrupt bit */
1390         if (list_empty(&uhci->urb_remove_list))
1391                 uhci_set_next_interrupt(uhci);
1392         list_add_tail(&urbp->urb_list, &uhci->urb_remove_list);
1393
1394 done:
1395         spin_unlock_irqrestore(&uhci->lock, flags);
1396         return 0;
1397 }
1398
1399 static int uhci_fsbr_timeout(struct uhci_hcd *uhci, struct urb *urb)
1400 {
1401         struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
1402         struct list_head *head;
1403         struct uhci_td *td;
1404         int count = 0;
1405
1406         uhci_dec_fsbr(uhci, urb);
1407
1408         urbp->fsbr_timeout = 1;
1409
1410         /*
1411          * Ideally we would want to fix qh->element as well, but it's
1412          * read/write by the HC, so that can introduce a race. It's not
1413          * really worth the hassle
1414          */
1415
1416         head = &urbp->td_list;
1417         list_for_each_entry(td, head, list) {
1418                 /*
1419                  * Make sure we don't do the last one (since it'll have the
1420                  * TERM bit set) as well as we skip every so many TD's to
1421                  * make sure it doesn't hog the bandwidth
1422                  */
1423                 if (td->list.next != head && (count % DEPTH_INTERVAL) ==
1424                                 (DEPTH_INTERVAL - 1))
1425                         td->link |= UHCI_PTR_DEPTH;
1426
1427                 count++;
1428         }
1429
1430         return 0;
1431 }
1432
1433 static void uhci_free_pending_qhs(struct uhci_hcd *uhci)
1434 {
1435         struct uhci_qh *qh, *tmp;
1436
1437         list_for_each_entry_safe(qh, tmp, &uhci->qh_remove_list, remove_list) {
1438                 list_del_init(&qh->remove_list);
1439
1440                 uhci_free_qh(uhci, qh);
1441         }
1442 }
1443
1444 static void uhci_free_pending_tds(struct uhci_hcd *uhci)
1445 {
1446         struct uhci_td *td, *tmp;
1447
1448         list_for_each_entry_safe(td, tmp, &uhci->td_remove_list, remove_list) {
1449                 list_del_init(&td->remove_list);
1450
1451                 uhci_free_td(uhci, td);
1452         }
1453 }
1454
1455 static void
1456 uhci_finish_urb(struct usb_hcd *hcd, struct urb *urb, struct pt_regs *regs)
1457 __releases(uhci->lock)
1458 __acquires(uhci->lock)
1459 {
1460         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
1461
1462         uhci_destroy_urb_priv(uhci, urb);
1463
1464         spin_unlock(&uhci->lock);
1465         usb_hcd_giveback_urb(hcd, urb, regs);
1466         spin_lock(&uhci->lock);
1467 }
1468
1469 static void uhci_finish_completion(struct uhci_hcd *uhci, struct pt_regs *regs)
1470 {
1471         struct urb_priv *urbp, *tmp;
1472
1473         list_for_each_entry_safe(urbp, tmp, &uhci->complete_list, urb_list) {
1474                 struct urb *urb = urbp->urb;
1475
1476                 list_del_init(&urbp->urb_list);
1477                 uhci_finish_urb(uhci_to_hcd(uhci), urb, regs);
1478         }
1479 }
1480
1481 static void uhci_remove_pending_urbps(struct uhci_hcd *uhci)
1482 {
1483
1484         /* Splice the urb_remove_list onto the end of the complete_list */
1485         list_splice_init(&uhci->urb_remove_list, uhci->complete_list.prev);
1486 }
1487
1488 /* Process events in the schedule, but only in one thread at a time */
1489 static void uhci_scan_schedule(struct uhci_hcd *uhci, struct pt_regs *regs)
1490 {
1491         struct urb_priv *urbp, *tmp;
1492
1493         /* Don't allow re-entrant calls */
1494         if (uhci->scan_in_progress) {
1495                 uhci->need_rescan = 1;
1496                 return;
1497         }
1498         uhci->scan_in_progress = 1;
1499  rescan:
1500         uhci->need_rescan = 0;
1501
1502         uhci_clear_next_interrupt(uhci);
1503         uhci_get_current_frame_number(uhci);
1504
1505         if (uhci->frame_number + uhci->is_stopped != uhci->qh_remove_age)
1506                 uhci_free_pending_qhs(uhci);
1507         if (uhci->frame_number + uhci->is_stopped != uhci->td_remove_age)
1508                 uhci_free_pending_tds(uhci);
1509         if (uhci->frame_number + uhci->is_stopped != uhci->urb_remove_age)
1510                 uhci_remove_pending_urbps(uhci);
1511
1512         /* Walk the list of pending URBs to see which ones completed
1513          * (must be _safe because uhci_transfer_result() dequeues URBs) */
1514         list_for_each_entry_safe(urbp, tmp, &uhci->urb_list, urb_list) {
1515                 struct urb *urb = urbp->urb;
1516
1517                 /* Checks the status and does all of the magic necessary */
1518                 uhci_transfer_result(uhci, urb);
1519         }
1520         uhci_finish_completion(uhci, regs);
1521
1522         /* If the controller is stopped, we can finish these off right now */
1523         if (uhci->is_stopped) {
1524                 uhci_free_pending_qhs(uhci);
1525                 uhci_free_pending_tds(uhci);
1526                 uhci_remove_pending_urbps(uhci);
1527         }
1528
1529         if (uhci->need_rescan)
1530                 goto rescan;
1531         uhci->scan_in_progress = 0;
1532
1533         if (list_empty(&uhci->urb_remove_list) &&
1534             list_empty(&uhci->td_remove_list) &&
1535             list_empty(&uhci->qh_remove_list))
1536                 uhci_clear_next_interrupt(uhci);
1537         else
1538                 uhci_set_next_interrupt(uhci);
1539
1540         /* Wake up anyone waiting for an URB to complete */
1541         wake_up_all(&uhci->waitqh);
1542 }
1543
1544 static void check_fsbr(struct uhci_hcd *uhci)
1545 {
1546         struct urb_priv *up;
1547
1548         list_for_each_entry(up, &uhci->urb_list, urb_list) {
1549                 struct urb *u = up->urb;
1550
1551                 spin_lock(&u->lock);
1552
1553                 /* Check if the FSBR timed out */
1554                 if (up->fsbr && !up->fsbr_timeout && time_after_eq(jiffies, up->fsbrtime + IDLE_TIMEOUT))
1555                         uhci_fsbr_timeout(uhci, u);
1556
1557                 spin_unlock(&u->lock);
1558         }
1559
1560         /* Really disable FSBR */
1561         if (!uhci->fsbr && uhci->fsbrtimeout && time_after_eq(jiffies, uhci->fsbrtimeout)) {
1562                 uhci->fsbrtimeout = 0;
1563                 uhci->skel_term_qh->link = UHCI_PTR_TERM;
1564         }
1565 }