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