sound/oss/dmabuf.c

   1 /*
   2  * sound/dmabuf.c
   3  *
   4  * The DMA buffer manager for digitized voice applications
   5  */
   6 /*
   7  * Copyright (C) by Hannu Savolainen 1993-1997
   8  *
   9  * OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
  10  * Version 2 (June 1991). See the "COPYING" file distributed with this software
  11  * for more info.
  12  *
  13  * Thomas Sailer   : moved several static variables into struct audio_operations
  14  *                   (which is grossly misnamed btw.) because they have the same
  15  *                   lifetime as the rest in there and dynamic allocation saves
  16  *                   12k or so
  17  * Thomas Sailer   : remove {in,out}_sleep_flag. It was used for the sleeper to
  18  *                   determine if it was woken up by the expiring timeout or by
  19  *                   an explicit wake_up. The return value from schedule_timeout
  20  *                   can be used instead; if 0, the wakeup was due to the timeout.
  21  *
  22  * Rob Riggs            Added persistent DMA buffers (1998/10/17)
  23  */
  24
  25 #define BE_CONSERVATIVE
  26 #define SAMPLE_ROUNDUP 0
  27
  28 #include "sound_config.h"
  29
  30 #define DMAP_FREE_ON_CLOSE      0
  31 #define DMAP_KEEP_ON_CLOSE      1
  32 extern int sound_dmap_flag;
  33
  34 static void dma_reset_output(int dev);
  35 static void dma_reset_input(int dev);
  36 static int local_start_dma(struct audio_operations *adev, unsigned long physaddr, int count, int dma_mode);
  37
  38
  39
  40 static int debugmem;            /* switched off by default */
  41 static int dma_buffsize = DSP_BUFFSIZE;
  42
  43 static long dmabuf_timeout(struct dma_buffparms *dmap)
  44 {
  45         long tmout;
  46
  47         tmout = (dmap->fragment_size * HZ) / dmap->data_rate;
  48         tmout += HZ / 5;        /* Some safety distance */
  49         if (tmout < (HZ / 2))
  50                 tmout = HZ / 2;
  51         if (tmout > 20 * HZ)
  52                 tmout = 20 * HZ;
  53         return tmout;
  54 }
  55
  56 static int sound_alloc_dmap(struct dma_buffparms *dmap)
  57 {
  58         char *start_addr, *end_addr;
  59         int dma_pagesize;
  60         int sz, size;
  61         struct page *page;
  62
  63         dmap->mapping_flags &= ~DMA_MAP_MAPPED;
  64
  65         if (dmap->raw_buf != NULL)
  66                 return 0;       /* Already done */
  67         if (dma_buffsize < 4096)
  68                 dma_buffsize = 4096;
  69         dma_pagesize = (dmap->dma < 4) ? (64 * 1024) : (128 * 1024);
  70
  71         /*
  72          *      Now check for the Cyrix problem.
  73          */
  74
  75         if(isa_dma_bridge_buggy==2)
  76                 dma_pagesize=32768;
  77
  78         dmap->raw_buf = NULL;
  79         dmap->buffsize = dma_buffsize;
  80         if (dmap->buffsize > dma_pagesize)
  81                 dmap->buffsize = dma_pagesize;
  82         start_addr = NULL;
  83         /*
  84          * Now loop until we get a free buffer. Try to get smaller buffer if
  85          * it fails. Don't accept smaller than 8k buffer for performance
  86          * reasons.
  87          */
  88         while (start_addr == NULL && dmap->buffsize > PAGE_SIZE) {
  89                 for (sz = 0, size = PAGE_SIZE; size < dmap->buffsize; sz++, size <<= 1);
  90                 dmap->buffsize = PAGE_SIZE * (1 << sz);
  91                 start_addr = (char *) __get_free_pages(GFP_ATOMIC|GFP_DMA|__GFP_NOWARN, sz);
  92                 if (start_addr == NULL)
  93                         dmap->buffsize /= 2;
  94         }
  95
  96         if (start_addr == NULL) {
  97                 printk(KERN_WARNING "Sound error: Couldn't allocate DMA buffer\n");
  98                 return -ENOMEM;
  99         } else {
 100                 /* make some checks */
 101                 end_addr = start_addr + dmap->buffsize - 1;
 102
 103                 if (debugmem)
 104                         printk(KERN_DEBUG "sound: start 0x%lx, end 0x%lx\n", (long) start_addr, (long) end_addr);
 105
 106                 /* now check if it fits into the same dma-pagesize */
 107
 108                 if (((long) start_addr & ~(dma_pagesize - 1)) != ((long) end_addr & ~(dma_pagesize - 1))
 109                     || end_addr >= (char *) (MAX_DMA_ADDRESS)) {
 110                         printk(KERN_ERR "sound: Got invalid address 0x%lx for %db DMA-buffer\n", (long) start_addr, dmap->buffsize);
 111                         return -EFAULT;
 112                 }
 113         }
 114         dmap->raw_buf = start_addr;
 115         dmap->raw_buf_phys = virt_to_bus(start_addr);
 116
 117         for (page = virt_to_page(start_addr); page <= virt_to_page(end_addr); page++)
 118                 SetPageReserved(page);
 119         return 0;
 120 }
 121
 122 static void sound_free_dmap(struct dma_buffparms *dmap)
 123 {
 124         int sz, size;
 125         struct page *page;
 126         unsigned long start_addr, end_addr;
 127
 128         if (dmap->raw_buf == NULL)
 129                 return;
 130         if (dmap->mapping_flags & DMA_MAP_MAPPED)
 131                 return;         /* Don't free mmapped buffer. Will use it next time */
 132         for (sz = 0, size = PAGE_SIZE; size < dmap->buffsize; sz++, size <<= 1);
 133
 134         start_addr = (unsigned long) dmap->raw_buf;
 135         end_addr = start_addr + dmap->buffsize;
 136
 137         for (page = virt_to_page(start_addr); page <= virt_to_page(end_addr); page++)
 138                 ClearPageReserved(page);
 139
 140         free_pages((unsigned long) dmap->raw_buf, sz);
 141         dmap->raw_buf = NULL;
 142 }
 143
 144
 145 /* Intel version !!!!!!!!! */
 146
 147 static int sound_start_dma(struct dma_buffparms *dmap, unsigned long physaddr, int count, int dma_mode)
 148 {
 149         unsigned long flags;
 150         int chan = dmap->dma;
 151
 152         /* printk( "Start DMA%d %d, %d\n",  chan,  (int)(physaddr-dmap->raw_buf_phys),  count); */
 153
 154         flags = claim_dma_lock();
 155         disable_dma(chan);
 156         clear_dma_ff(chan);
 157         set_dma_mode(chan, dma_mode);
 158         set_dma_addr(chan, physaddr);
 159         set_dma_count(chan, count);
 160         enable_dma(chan);
 161         release_dma_lock(flags);
 162
 163         return 0;
 164 }
 165
 166 static void dma_init_buffers(struct dma_buffparms *dmap)
 167 {
 168         dmap->qlen = dmap->qhead = dmap->qtail = dmap->user_counter = 0;
 169         dmap->byte_counter = 0;
 170         dmap->max_byte_counter = 8000 * 60 * 60;
 171         dmap->bytes_in_use = dmap->buffsize;
 172
 173         dmap->dma_mode = DMODE_NONE;
 174         dmap->mapping_flags = 0;
 175         dmap->neutral_byte = 0x80;
 176         dmap->data_rate = 8000;
 177         dmap->cfrag = -1;
 178         dmap->closing = 0;
 179         dmap->nbufs = 1;
 180         dmap->flags = DMA_BUSY; /* Other flags off */
 181 }
 182
 183 static int open_dmap(struct audio_operations *adev, int mode, struct dma_buffparms *dmap)
 184 {
 185         int err;
 186
 187         if (dmap->flags & DMA_BUSY)
 188                 return -EBUSY;
 189         if ((err = sound_alloc_dmap(dmap)) < 0)
 190                 return err;
 191
 192         if (dmap->raw_buf == NULL) {
 193                 printk(KERN_WARNING "Sound: DMA buffers not available\n");
 194                 return -ENOSPC; /* Memory allocation failed during boot */
 195         }
 196         if (dmap->dma >= 0 && sound_open_dma(dmap->dma, adev->name)) {
 197                 printk(KERN_WARNING "Unable to grab(2) DMA%d for the audio driver\n", dmap->dma);
 198                 return -EBUSY;
 199         }
 200         dma_init_buffers(dmap);
 201         spin_lock_init(&dmap->lock);
 202         dmap->open_mode = mode;
 203         dmap->subdivision = dmap->underrun_count = 0;
 204         dmap->fragment_size = 0;
 205         dmap->max_fragments = 65536;    /* Just a large value */
 206         dmap->byte_counter = 0;
 207         dmap->max_byte_counter = 8000 * 60 * 60;
 208         dmap->applic_profile = APF_NORMAL;
 209         dmap->needs_reorg = 1;
 210         dmap->audio_callback = NULL;
 211         dmap->callback_parm = 0;
 212         return 0;
 213 }
 214
 215 static void close_dmap(struct audio_operations *adev, struct dma_buffparms *dmap)
 216 {
 217         unsigned long flags;
 218
 219         if (dmap->dma >= 0) {
 220                 sound_close_dma(dmap->dma);
 221                 flags=claim_dma_lock();
 222                 disable_dma(dmap->dma);
 223                 release_dma_lock(flags);
 224         }
 225         if (dmap->flags & DMA_BUSY)
 226                 dmap->dma_mode = DMODE_NONE;
 227         dmap->flags &= ~DMA_BUSY;
 228
 229         if (sound_dmap_flag == DMAP_FREE_ON_CLOSE)
 230                 sound_free_dmap(dmap);
 231 }
 232
 233
 234 static unsigned int default_set_bits(int dev, unsigned int bits)
 235 {
 236         mm_segment_t fs = get_fs();
 237
 238         set_fs(get_ds());
 239         audio_devs[dev]->d->ioctl(dev, SNDCTL_DSP_SETFMT, (void __user *)&bits);
 240         set_fs(fs);
 241         return bits;
 242 }
 243
 244 static int default_set_speed(int dev, int speed)
 245 {
 246         mm_segment_t fs = get_fs();
 247
 248         set_fs(get_ds());
 249         audio_devs[dev]->d->ioctl(dev, SNDCTL_DSP_SPEED, (void __user *)&speed);
 250         set_fs(fs);
 251         return speed;
 252 }
 253
 254 static short default_set_channels(int dev, short channels)
 255 {
 256         int c = channels;
 257         mm_segment_t fs = get_fs();
 258
 259         set_fs(get_ds());
 260         audio_devs[dev]->d->ioctl(dev, SNDCTL_DSP_CHANNELS, (void __user *)&c);
 261         set_fs(fs);
 262         return c;
 263 }
 264
 265 static void check_driver(struct audio_driver *d)
 266 {
 267         if (d->set_speed == NULL)
 268                 d->set_speed = default_set_speed;
 269         if (d->set_bits == NULL)
 270                 d->set_bits = default_set_bits;
 271         if (d->set_channels == NULL)
 272                 d->set_channels = default_set_channels;
 273 }
 274
 275 int DMAbuf_open(int dev, int mode)
 276 {
 277         struct audio_operations *adev = audio_devs[dev];
 278         int retval;
 279         struct dma_buffparms *dmap_in = NULL;
 280         struct dma_buffparms *dmap_out = NULL;
 281
 282         if (!adev)
 283                   return -ENXIO;
 284         if (!(adev->flags & DMA_DUPLEX))
 285                 adev->dmap_in = adev->dmap_out;
 286         check_driver(adev->d);
 287
 288         if ((retval = adev->d->open(dev, mode)) < 0)
 289                 return retval;
 290         dmap_out = adev->dmap_out;
 291         dmap_in = adev->dmap_in;
 292         if (dmap_in == dmap_out)
 293                 adev->flags &= ~DMA_DUPLEX;
 294
 295         if (mode & OPEN_WRITE) {
 296                 if ((retval = open_dmap(adev, mode, dmap_out)) < 0) {
 297                         adev->d->close(dev);
 298                         return retval;
 299                 }
 300         }
 301         adev->enable_bits = mode;
 302
 303         if (mode == OPEN_READ || (mode != OPEN_WRITE && (adev->flags & DMA_DUPLEX))) {
 304                 if ((retval = open_dmap(adev, mode, dmap_in)) < 0) {
 305                         adev->d->close(dev);
 306                         if (mode & OPEN_WRITE)
 307                                 close_dmap(adev, dmap_out);
 308                         return retval;
 309                 }
 310         }
 311         adev->open_mode = mode;
 312         adev->go = 1;
 313
 314         adev->d->set_bits(dev, 8);
 315         adev->d->set_channels(dev, 1);
 316         adev->d->set_speed(dev, DSP_DEFAULT_SPEED);
 317         if (adev->dmap_out->dma_mode == DMODE_OUTPUT)
 318                 memset(adev->dmap_out->raw_buf, adev->dmap_out->neutral_byte,
 319                        adev->dmap_out->bytes_in_use);
 320         return 0;
 321 }
 322 /* MUST not hold the spinlock */
 323 void DMAbuf_reset(int dev)
 324 {
 325         if (audio_devs[dev]->open_mode & OPEN_WRITE)
 326                 dma_reset_output(dev);
 327
 328         if (audio_devs[dev]->open_mode & OPEN_READ)
 329                 dma_reset_input(dev);
 330 }
 331
 332 static void dma_reset_output(int dev)
 333 {
 334         struct audio_operations *adev = audio_devs[dev];
 335         unsigned long flags,f ;
 336         struct dma_buffparms *dmap = adev->dmap_out;
 337
 338         if (!(dmap->flags & DMA_STARTED))       /* DMA is not active */
 339                 return;
 340
 341         /*
 342          *      First wait until the current fragment has been played completely
 343          */
 344         spin_lock_irqsave(&dmap->lock,flags);
 345         adev->dmap_out->flags |= DMA_SYNCING;
 346
 347         adev->dmap_out->underrun_count = 0;
 348         if (!signal_pending(current) && adev->dmap_out->qlen &&
 349             adev->dmap_out->underrun_count == 0){
 350                 spin_unlock_irqrestore(&dmap->lock,flags);
 351                 interruptible_sleep_on_timeout(&adev->out_sleeper,
 352                                                dmabuf_timeout(dmap));
 353                 spin_lock_irqsave(&dmap->lock,flags);
 354         }
 355         adev->dmap_out->flags &= ~(DMA_SYNCING | DMA_ACTIVE);
 356
 357         /*
 358          *      Finally shut the device off
 359          */
 360         if (!(adev->flags & DMA_DUPLEX) || !adev->d->halt_output)
 361                 adev->d->halt_io(dev);
 362         else
 363                 adev->d->halt_output(dev);
 364         adev->dmap_out->flags &= ~DMA_STARTED;
 365
 366         f=claim_dma_lock();
 367         clear_dma_ff(dmap->dma);
 368         disable_dma(dmap->dma);
 369         release_dma_lock(f);
 370
 371         dmap->byte_counter = 0;
 372         reorganize_buffers(dev, adev->dmap_out, 0);
 373         dmap->qlen = dmap->qhead = dmap->qtail = dmap->user_counter = 0;
 374         spin_unlock_irqrestore(&dmap->lock,flags);
 375 }
 376
 377 static void dma_reset_input(int dev)
 378 {
 379         struct audio_operations *adev = audio_devs[dev];
 380         unsigned long flags;
 381         struct dma_buffparms *dmap = adev->dmap_in;
 382
 383         spin_lock_irqsave(&dmap->lock,flags);
 384         if (!(adev->flags & DMA_DUPLEX) || !adev->d->halt_input)
 385                 adev->d->halt_io(dev);
 386         else
 387                 adev->d->halt_input(dev);
 388         adev->dmap_in->flags &= ~DMA_STARTED;
 389
 390         dmap->qlen = dmap->qhead = dmap->qtail = dmap->user_counter = 0;
 391         dmap->byte_counter = 0;
 392         reorganize_buffers(dev, adev->dmap_in, 1);
 393         spin_unlock_irqrestore(&dmap->lock,flags);
 394 }
 395 /* MUST be called with holding the dmap->lock */
 396 void DMAbuf_launch_output(int dev, struct dma_buffparms *dmap)
 397 {
 398         struct audio_operations *adev = audio_devs[dev];
 399
 400         if (!((adev->enable_bits * adev->go) & PCM_ENABLE_OUTPUT))
 401                 return;         /* Don't start DMA yet */
 402         dmap->dma_mode = DMODE_OUTPUT;
 403
 404         if (!(dmap->flags & DMA_ACTIVE) || !(adev->flags & DMA_AUTOMODE) || (dmap->flags & DMA_NODMA)) {
 405                 if (!(dmap->flags & DMA_STARTED)) {
 406                         reorganize_buffers(dev, dmap, 0);
 407                         if (adev->d->prepare_for_output(dev, dmap->fragment_size, dmap->nbufs))
 408                                 return;
 409                         if (!(dmap->flags & DMA_NODMA))
 410                                 local_start_dma(adev, dmap->raw_buf_phys, dmap->bytes_in_use,DMA_MODE_WRITE);
 411                         dmap->flags |= DMA_STARTED;
 412                 }
 413                 if (dmap->counts[dmap->qhead] == 0)
 414                         dmap->counts[dmap->qhead] = dmap->fragment_size;
 415                 dmap->dma_mode = DMODE_OUTPUT;
 416                 adev->d->output_block(dev, dmap->raw_buf_phys + dmap->qhead * dmap->fragment_size,
 417                                       dmap->counts[dmap->qhead], 1);
 418                 if (adev->d->trigger)
 419                         adev->d->trigger(dev,adev->enable_bits * adev->go);
 420         }
 421         dmap->flags |= DMA_ACTIVE;
 422 }
 423
 424 int DMAbuf_sync(int dev)
 425 {
 426         struct audio_operations *adev = audio_devs[dev];
 427         unsigned long flags;
 428         int n = 0;
 429         struct dma_buffparms *dmap;
 430
 431         if (!adev->go && !(adev->enable_bits & PCM_ENABLE_OUTPUT))
 432                 return 0;
 433
 434         if (adev->dmap_out->dma_mode == DMODE_OUTPUT) {
 435                 dmap = adev->dmap_out;
 436                 spin_lock_irqsave(&dmap->lock,flags);
 437                 if (dmap->qlen > 0 && !(dmap->flags & DMA_ACTIVE))
 438                         DMAbuf_launch_output(dev, dmap);
 439                 adev->dmap_out->flags |= DMA_SYNCING;
 440                 adev->dmap_out->underrun_count = 0;
 441                 while (!signal_pending(current) && n++ <= adev->dmap_out->nbufs &&
 442                        adev->dmap_out->qlen && adev->dmap_out->underrun_count == 0) {
 443                         long t = dmabuf_timeout(dmap);
 444                         spin_unlock_irqrestore(&dmap->lock,flags);
 445                         /* FIXME: not safe may miss events */
 446                         t = interruptible_sleep_on_timeout(&adev->out_sleeper, t);
 447                         spin_lock_irqsave(&dmap->lock,flags);
 448                         if (!t) {
 449                                 adev->dmap_out->flags &= ~DMA_SYNCING;
 450                                 spin_unlock_irqrestore(&dmap->lock,flags);
 451                                 return adev->dmap_out->qlen;
 452                         }
 453                 }
 454                 adev->dmap_out->flags &= ~(DMA_SYNCING | DMA_ACTIVE);
 455
 456                 /*
 457                  * Some devices such as GUS have huge amount of on board RAM for the
 458                  * audio data. We have to wait until the device has finished playing.
 459                  */
 460
 461                 /* still holding the lock */
 462                 if (adev->d->local_qlen) {   /* Device has hidden buffers */
 463                         while (!signal_pending(current) &&
 464                                adev->d->local_qlen(dev)){
 465                                 spin_unlock_irqrestore(&dmap->lock,flags);
 466                                 interruptible_sleep_on_timeout(&adev->out_sleeper,
 467                                                                dmabuf_timeout(dmap));
 468                                 spin_lock_irqsave(&dmap->lock,flags);
 469                         }
 470                 }
 471                 spin_unlock_irqrestore(&dmap->lock,flags);
 472         }
 473         adev->dmap_out->dma_mode = DMODE_NONE;
 474         return adev->dmap_out->qlen;
 475 }
 476
 477 int DMAbuf_release(int dev, int mode)
 478 {
 479         struct audio_operations *adev = audio_devs[dev];
 480         struct dma_buffparms *dmap;
 481         unsigned long flags;
 482
 483         dmap = adev->dmap_out;
 484         if (adev->open_mode & OPEN_WRITE)
 485                 adev->dmap_out->closing = 1;
 486
 487         if (adev->open_mode & OPEN_READ){
 488                 adev->dmap_in->closing = 1;
 489                 dmap = adev->dmap_in;
 490         }
 491         if (adev->open_mode & OPEN_WRITE)
 492                 if (!(adev->dmap_out->mapping_flags & DMA_MAP_MAPPED))
 493                         if (!signal_pending(current) && (adev->dmap_out->dma_mode == DMODE_OUTPUT))
 494                                 DMAbuf_sync(dev);
 495         if (adev->dmap_out->dma_mode == DMODE_OUTPUT)
 496                 memset(adev->dmap_out->raw_buf, adev->dmap_out->neutral_byte, adev->dmap_out->bytes_in_use);
 497
 498         DMAbuf_reset(dev);
 499         spin_lock_irqsave(&dmap->lock,flags);
 500         adev->d->close(dev);
 501
 502         if (adev->open_mode & OPEN_WRITE)
 503                 close_dmap(adev, adev->dmap_out);
 504
 505         if (adev->open_mode == OPEN_READ ||
 506             (adev->open_mode != OPEN_WRITE &&
 507              (adev->flags & DMA_DUPLEX)))
 508                 close_dmap(adev, adev->dmap_in);
 509         adev->open_mode = 0;
 510         spin_unlock_irqrestore(&dmap->lock,flags);
 511         return 0;
 512 }
 513 /* called with dmap->lock dold */
 514 int DMAbuf_activate_recording(int dev, struct dma_buffparms *dmap)
 515 {
 516         struct audio_operations *adev = audio_devs[dev];
 517         int  err;
 518
 519         if (!(adev->open_mode & OPEN_READ))
 520                 return 0;
 521         if (!(adev->enable_bits & PCM_ENABLE_INPUT))
 522                 return 0;
 523         if (dmap->dma_mode == DMODE_OUTPUT) {   /* Direction change */
 524                 /* release lock - it's not recursive */
 525                 spin_unlock_irq(&dmap->lock);
 526                 DMAbuf_sync(dev);
 527                 DMAbuf_reset(dev);
 528                 spin_lock_irq(&dmap->lock);
 529                 dmap->dma_mode = DMODE_NONE;
 530         }
 531         if (!dmap->dma_mode) {
 532                 reorganize_buffers(dev, dmap, 1);
 533                 if ((err = adev->d->prepare_for_input(dev,
 534                                 dmap->fragment_size, dmap->nbufs)) < 0)
 535                         return err;
 536                 dmap->dma_mode = DMODE_INPUT;
 537         }
 538         if (!(dmap->flags & DMA_ACTIVE)) {
 539                 if (dmap->needs_reorg)
 540                         reorganize_buffers(dev, dmap, 0);
 541                 local_start_dma(adev, dmap->raw_buf_phys, dmap->bytes_in_use, DMA_MODE_READ);
 542                 adev->d->start_input(dev, dmap->raw_buf_phys + dmap->qtail * dmap->fragment_size,
 543                                      dmap->fragment_size, 0);
 544                 dmap->flags |= DMA_ACTIVE;
 545                 if (adev->d->trigger)
 546                         adev->d->trigger(dev, adev->enable_bits * adev->go);
 547         }
 548         return 0;
 549 }
 550 /* aquires lock */
 551 int DMAbuf_getrdbuffer(int dev, char **buf, int *len, int dontblock)
 552 {
 553         struct audio_operations *adev = audio_devs[dev];
 554         unsigned long flags;
 555         int err = 0, n = 0;
 556         struct dma_buffparms *dmap = adev->dmap_in;
 557         int go;
 558
 559         if (!(adev->open_mode & OPEN_READ))
 560                 return -EIO;
 561         spin_lock_irqsave(&dmap->lock,flags);
 562         if (dmap->needs_reorg)
 563                 reorganize_buffers(dev, dmap, 0);
 564         if (adev->dmap_in->mapping_flags & DMA_MAP_MAPPED) {
 565 /*                printk(KERN_WARNING "Sound: Can't read from mmapped device (1)\n");*/
 566                   spin_unlock_irqrestore(&dmap->lock,flags);
 567                   return -EINVAL;
 568         } else while (dmap->qlen <= 0 && n++ < 10) {
 569                 long timeout = MAX_SCHEDULE_TIMEOUT;
 570                 if (!(adev->enable_bits & PCM_ENABLE_INPUT) || !adev->go) {
 571                         spin_unlock_irqrestore(&dmap->lock,flags);
 572                         return -EAGAIN;
 573                 }
 574                 if ((err = DMAbuf_activate_recording(dev, dmap)) < 0) {
 575                         spin_unlock_irqrestore(&dmap->lock,flags);
 576                         return err;
 577                 }
 578                 /* Wait for the next block */
 579
 580                 if (dontblock) {
 581                         spin_unlock_irqrestore(&dmap->lock,flags);
 582                         return -EAGAIN;
 583                 }
 584                 if ((go = adev->go))
 585                         timeout = dmabuf_timeout(dmap);
 586
 587                 spin_unlock_irqrestore(&dmap->lock,flags);
 588                 timeout = interruptible_sleep_on_timeout(&adev->in_sleeper,
 589                                                          timeout);
 590                 if (!timeout) {
 591                         /* FIXME: include device name */
 592                         err = -EIO;
 593                         printk(KERN_WARNING "Sound: DMA (input) timed out - IRQ/DRQ config error?\n");
 594                         dma_reset_input(dev);
 595                 } else
 596                         err = -EINTR;
 597                 spin_lock_irqsave(&dmap->lock,flags);
 598         }
 599         spin_unlock_irqrestore(&dmap->lock,flags);
 600
 601         if (dmap->qlen <= 0)
 602                 return err ? err : -EINTR;
 603         *buf = &dmap->raw_buf[dmap->qhead * dmap->fragment_size + dmap->counts[dmap->qhead]];
 604         *len = dmap->fragment_size - dmap->counts[dmap->qhead];
 605
 606         return dmap->qhead;
 607 }
 608
 609 int DMAbuf_rmchars(int dev, int buff_no, int c)
 610 {
 611         struct audio_operations *adev = audio_devs[dev];
 612         struct dma_buffparms *dmap = adev->dmap_in;
 613         int p = dmap->counts[dmap->qhead] + c;
 614
 615         if (dmap->mapping_flags & DMA_MAP_MAPPED)
 616         {
 617 /*                printk("Sound: Can't read from mmapped device (2)\n");*/
 618                 return -EINVAL;
 619         }
 620         else if (dmap->qlen <= 0)
 621                 return -EIO;
 622         else if (p >= dmap->fragment_size) {  /* This buffer is completely empty */
 623                 dmap->counts[dmap->qhead] = 0;
 624                 dmap->qlen--;
 625                 dmap->qhead = (dmap->qhead + 1) % dmap->nbufs;
 626         }
 627         else dmap->counts[dmap->qhead] = p;
 628
 629         return 0;
 630 }
 631 /* MUST be called with dmap->lock hold */
 632 int DMAbuf_get_buffer_pointer(int dev, struct dma_buffparms *dmap, int direction)
 633 {
 634         /*
 635          *      Try to approximate the active byte position of the DMA pointer within the
 636          *      buffer area as well as possible.
 637          */
 638
 639         int pos;
 640         unsigned long f;
 641
 642         if (!(dmap->flags & DMA_ACTIVE))
 643                 pos = 0;
 644         else {
 645                 int chan = dmap->dma;
 646
 647                 f=claim_dma_lock();
 648                 clear_dma_ff(chan);
 649
 650                 if(!isa_dma_bridge_buggy)
 651                         disable_dma(dmap->dma);
 652
 653                 pos = get_dma_residue(chan);
 654
 655                 pos = dmap->bytes_in_use - pos;
 656
 657                 if (!(dmap->mapping_flags & DMA_MAP_MAPPED)) {
 658                         if (direction == DMODE_OUTPUT) {
 659                                 if (dmap->qhead == 0)
 660                                         if (pos > dmap->fragment_size)
 661                                                 pos = 0;
 662                         } else {
 663                                 if (dmap->qtail == 0)
 664                                         if (pos > dmap->fragment_size)
 665                                                 pos = 0;
 666                         }
 667                 }
 668                 if (pos < 0)
 669                         pos = 0;
 670                 if (pos >= dmap->bytes_in_use)
 671                         pos = 0;
 672
 673                 if(!isa_dma_bridge_buggy)
 674                         enable_dma(dmap->dma);
 675
 676                 release_dma_lock(f);
 677         }
 678         /* printk( "%04x ",  pos); */
 679
 680         return pos;
 681 }
 682
 683 /*
 684  *      DMAbuf_start_devices() is called by the /dev/music driver to start
 685  *      one or more audio devices at desired moment.
 686  */
 687
 688 void DMAbuf_start_devices(unsigned int devmask)
 689 {
 690         struct audio_operations *adev;
 691         int dev;
 692
 693         for (dev = 0; dev < num_audiodevs; dev++) {
 694                 if (!(devmask & (1 << dev)))
 695                         continue;
 696                 if (!(adev = audio_devs[dev]))
 697                         continue;
 698                 if (adev->open_mode == 0)
 699                         continue;
 700                 if (adev->go)
 701                         continue;
 702                 /* OK to start the device */
 703                 adev->go = 1;
 704                 if (adev->d->trigger)
 705                         adev->d->trigger(dev,adev->enable_bits * adev->go);
 706         }
 707 }
 708 /* via poll called without a lock ?*/
 709 int DMAbuf_space_in_queue(int dev)
 710 {
 711         struct audio_operations *adev = audio_devs[dev];
 712         int len, max, tmp;
 713         struct dma_buffparms *dmap = adev->dmap_out;
 714         int lim = dmap->nbufs;
 715
 716         if (lim < 2)
 717                 lim = 2;
 718
 719         if (dmap->qlen >= lim)  /* No space at all */
 720                 return 0;
 721
 722         /*
 723          *      Verify that there are no more pending buffers than the limit
 724          *      defined by the process.
 725          */
 726
 727         max = dmap->max_fragments;
 728         if (max > lim)
 729                 max = lim;
 730         len = dmap->qlen;
 731
 732         if (adev->d->local_qlen) {
 733                 tmp = adev->d->local_qlen(dev);
 734                 if (tmp && len)
 735                         tmp--;  /* This buffer has been counted twice */
 736                 len += tmp;
 737         }
 738         if (dmap->byte_counter % dmap->fragment_size)   /* There is a partial fragment */
 739                 len = len + 1;
 740
 741         if (len >= max)
 742                 return 0;
 743         return max - len;
 744 }
 745 /* MUST not hold the spinlock  - this function may sleep */
 746 static int output_sleep(int dev, int dontblock)
 747 {
 748         struct audio_operations *adev = audio_devs[dev];
 749         int err = 0;
 750         struct dma_buffparms *dmap = adev->dmap_out;
 751         long timeout;
 752         long timeout_value;
 753
 754         if (dontblock)
 755                 return -EAGAIN;
 756         if (!(adev->enable_bits & PCM_ENABLE_OUTPUT))
 757                 return -EAGAIN;
 758
 759         /*
 760          * Wait for free space
 761          */
 762         if (signal_pending(current))
 763                 return -EINTR;
 764         timeout = (adev->go && !(dmap->flags & DMA_NOTIMEOUT));
 765         if (timeout)
 766                 timeout_value = dmabuf_timeout(dmap);
 767         else
 768                 timeout_value = MAX_SCHEDULE_TIMEOUT;
 769         timeout_value = interruptible_sleep_on_timeout(&adev->out_sleeper,
 770                                                        timeout_value);
 771         if (timeout != MAX_SCHEDULE_TIMEOUT && !timeout_value) {
 772                 printk(KERN_WARNING "Sound: DMA (output) timed out - IRQ/DRQ config error?\n");
 773                 dma_reset_output(dev);
 774         } else {
 775                 if (signal_pending(current))
 776                         err = -EINTR;
 777         }
 778         return err;
 779 }
 780 /* called with the lock held */
 781 static int find_output_space(int dev, char **buf, int *size)
 782 {
 783         struct audio_operations *adev = audio_devs[dev];
 784         struct dma_buffparms *dmap = adev->dmap_out;
 785         unsigned long active_offs;
 786         long len, offs;
 787         int maxfrags;
 788         int occupied_bytes = (dmap->user_counter % dmap->fragment_size);
 789
 790         *buf = dmap->raw_buf;
 791         if (!(maxfrags = DMAbuf_space_in_queue(dev)) && !occupied_bytes)
 792                 return 0;
 793
 794 #ifdef BE_CONSERVATIVE
 795         active_offs = dmap->byte_counter + dmap->qhead * dmap->fragment_size;
 796 #else
 797         active_offs = DMAbuf_get_buffer_pointer(dev, dmap, DMODE_OUTPUT);
 798         /* Check for pointer wrapping situation */
 799         if (active_offs < 0 || active_offs >= dmap->bytes_in_use)
 800                 active_offs = 0;
 801         active_offs += dmap->byte_counter;
 802 #endif
 803
 804         offs = (dmap->user_counter % dmap->bytes_in_use) & ~SAMPLE_ROUNDUP;
 805         if (offs < 0 || offs >= dmap->bytes_in_use) {
 806                 printk(KERN_ERR "Sound: Got unexpected offs %ld. Giving up.\n", offs);
 807                 printk("Counter = %ld, bytes=%d\n", dmap->user_counter, dmap->bytes_in_use);
 808                 return 0;
 809         }
 810         *buf = dmap->raw_buf + offs;
 811
 812         len = active_offs + dmap->bytes_in_use - dmap->user_counter;    /* Number of unused bytes in buffer */
 813
 814         if ((offs + len) > dmap->bytes_in_use)
 815                 len = dmap->bytes_in_use - offs;
 816         if (len < 0) {
 817                 return 0;
 818         }
 819         if (len > ((maxfrags * dmap->fragment_size) - occupied_bytes))
 820                 len = (maxfrags * dmap->fragment_size) - occupied_bytes;
 821         *size = len & ~SAMPLE_ROUNDUP;
 822         return (*size > 0);
 823 }
 824 /* aquires lock  */
 825 int DMAbuf_getwrbuffer(int dev, char **buf, int *size, int dontblock)
 826 {
 827         struct audio_operations *adev = audio_devs[dev];
 828         unsigned long flags;
 829         int err = -EIO;
 830         struct dma_buffparms *dmap = adev->dmap_out;
 831
 832         if (dmap->mapping_flags & DMA_MAP_MAPPED) {
 833 /*              printk(KERN_DEBUG "Sound: Can't write to mmapped device (3)\n");*/
 834                 return -EINVAL;
 835         }
 836         spin_lock_irqsave(&dmap->lock,flags);
 837         if (dmap->needs_reorg)
 838                 reorganize_buffers(dev, dmap, 0);
 839
 840         if (dmap->dma_mode == DMODE_INPUT) {    /* Direction change */
 841                 spin_unlock_irqrestore(&dmap->lock,flags);
 842                 DMAbuf_reset(dev);
 843                 spin_lock_irqsave(&dmap->lock,flags);
 844         }
 845         dmap->dma_mode = DMODE_OUTPUT;
 846
 847         while (find_output_space(dev, buf, size) <= 0) {
 848                 spin_unlock_irqrestore(&dmap->lock,flags);
 849                 if ((err = output_sleep(dev, dontblock)) < 0) {
 850                         return err;
 851                 }
 852                 spin_lock_irqsave(&dmap->lock,flags);
 853         }
 854
 855         spin_unlock_irqrestore(&dmap->lock,flags);
 856         return 0;
 857 }
 858 /* has to aquire dmap->lock */
 859 int DMAbuf_move_wrpointer(int dev, int l)
 860 {
 861         struct audio_operations *adev = audio_devs[dev];
 862         struct dma_buffparms *dmap = adev->dmap_out;
 863         unsigned long ptr;
 864         unsigned long end_ptr, p;
 865         int post;
 866         unsigned long flags;
 867
 868         spin_lock_irqsave(&dmap->lock,flags);
 869         post= (dmap->flags & DMA_POST);
 870         ptr = (dmap->user_counter / dmap->fragment_size) * dmap->fragment_size;
 871
 872         dmap->flags &= ~DMA_POST;
 873         dmap->cfrag = -1;
 874         dmap->user_counter += l;
 875         dmap->flags |= DMA_DIRTY;
 876
 877         if (dmap->byte_counter >= dmap->max_byte_counter) {
 878                 /* Wrap the byte counters */
 879                 long decr = dmap->byte_counter;
 880                 dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use);
 881                 decr -= dmap->byte_counter;
 882                 dmap->user_counter -= decr;
 883         }
 884         end_ptr = (dmap->user_counter / dmap->fragment_size) * dmap->fragment_size;
 885
 886         p = (dmap->user_counter - 1) % dmap->bytes_in_use;
 887         dmap->neutral_byte = dmap->raw_buf[p];
 888
 889         /* Update the fragment based bookkeeping too */
 890         while (ptr < end_ptr) {
 891                 dmap->counts[dmap->qtail] = dmap->fragment_size;
 892                 dmap->qtail = (dmap->qtail + 1) % dmap->nbufs;
 893                 dmap->qlen++;
 894                 ptr += dmap->fragment_size;
 895         }
 896
 897         dmap->counts[dmap->qtail] = dmap->user_counter - ptr;
 898
 899         /*
 900          *      Let the low level driver perform some postprocessing to
 901          *      the written data.
 902          */
 903         if (adev->d->postprocess_write)
 904                 adev->d->postprocess_write(dev);
 905
 906         if (!(dmap->flags & DMA_ACTIVE))
 907                 if (dmap->qlen > 1 || (dmap->qlen > 0 && (post || dmap->qlen >= dmap->nbufs - 1)))
 908                         DMAbuf_launch_output(dev, dmap);
 909
 910         spin_unlock_irqrestore(&dmap->lock,flags);
 911         return 0;
 912 }
 913
 914 int DMAbuf_start_dma(int dev, unsigned long physaddr, int count, int dma_mode)
 915 {
 916         struct audio_operations *adev = audio_devs[dev];
 917         struct dma_buffparms *dmap = (dma_mode == DMA_MODE_WRITE) ? adev->dmap_out : adev->dmap_in;
 918
 919         if (dmap->raw_buf == NULL) {
 920                 printk(KERN_ERR "sound: DMA buffer(1) == NULL\n");
 921                 printk("Device %d, chn=%s\n", dev, (dmap == adev->dmap_out) ? "out" : "in");
 922                 return 0;
 923         }
 924         if (dmap->dma < 0)
 925                 return 0;
 926         sound_start_dma(dmap, physaddr, count, dma_mode);
 927         return count;
 928 }
 929
 930 static int local_start_dma(struct audio_operations *adev, unsigned long physaddr, int count, int dma_mode)
 931 {
 932         struct dma_buffparms *dmap = (dma_mode == DMA_MODE_WRITE) ? adev->dmap_out : adev->dmap_in;
 933
 934         if (dmap->raw_buf == NULL) {
 935                 printk(KERN_ERR "sound: DMA buffer(2) == NULL\n");
 936                 printk(KERN_ERR "Device %s, chn=%s\n", adev->name, (dmap == adev->dmap_out) ? "out" : "in");
 937                 return 0;
 938         }
 939         if (dmap->flags & DMA_NODMA)
 940                 return 1;
 941         if (dmap->dma < 0)
 942                 return 0;
 943         sound_start_dma(dmap, dmap->raw_buf_phys, dmap->bytes_in_use, dma_mode | DMA_AUTOINIT);
 944         dmap->flags |= DMA_STARTED;
 945         return count;
 946 }
 947
 948 static void finish_output_interrupt(int dev, struct dma_buffparms *dmap)
 949 {
 950         struct audio_operations *adev = audio_devs[dev];
 951
 952         if (dmap->audio_callback != NULL)
 953                 dmap->audio_callback(dev, dmap->callback_parm);
 954         wake_up(&adev->out_sleeper);
 955         wake_up(&adev->poll_sleeper);
 956 }
 957 /* called with dmap->lock held in irq context*/
 958 static void do_outputintr(int dev, int dummy)
 959 {
 960         struct audio_operations *adev = audio_devs[dev];
 961         struct dma_buffparms *dmap = adev->dmap_out;
 962         int this_fragment;
 963
 964         if (dmap->raw_buf == NULL) {
 965                 printk(KERN_ERR "Sound: Error. Audio interrupt (%d) after freeing buffers.\n", dev);
 966                 return;
 967         }
 968         if (dmap->mapping_flags & DMA_MAP_MAPPED) {     /* Virtual memory mapped access */
 969                 /* mmapped access */
 970                 dmap->qhead = (dmap->qhead + 1) % dmap->nbufs;
 971                 if (dmap->qhead == 0) {     /* Wrapped */
 972                         dmap->byte_counter += dmap->bytes_in_use;
 973                         if (dmap->byte_counter >= dmap->max_byte_counter) {     /* Overflow */
 974                                 long decr = dmap->byte_counter;
 975                                 dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use);
 976                                 decr -= dmap->byte_counter;
 977                                 dmap->user_counter -= decr;
 978                         }
 979                 }
 980                 dmap->qlen++;   /* Yes increment it (don't decrement) */
 981                 if (!(adev->flags & DMA_AUTOMODE))
 982                         dmap->flags &= ~DMA_ACTIVE;
 983                 dmap->counts[dmap->qhead] = dmap->fragment_size;
 984                 DMAbuf_launch_output(dev, dmap);
 985                 finish_output_interrupt(dev, dmap);
 986                 return;
 987         }
 988
 989         dmap->qlen--;
 990         this_fragment = dmap->qhead;
 991         dmap->qhead = (dmap->qhead + 1) % dmap->nbufs;
 992
 993         if (dmap->qhead == 0) { /* Wrapped */
 994                 dmap->byte_counter += dmap->bytes_in_use;
 995                 if (dmap->byte_counter >= dmap->max_byte_counter) {     /* Overflow */
 996                         long decr = dmap->byte_counter;
 997                         dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use);
 998                         decr -= dmap->byte_counter;
 999                         dmap->user_counter -= decr;
1000                 }
1001         }
1002         if (!(adev->flags & DMA_AUTOMODE))
1003                 dmap->flags &= ~DMA_ACTIVE;
1004
1005         /*
1006          *      This is  dmap->qlen <= 0 except when closing when
1007          *      dmap->qlen < 0
1008          */
1009
1010         while (dmap->qlen <= -dmap->closing) {
1011                 dmap->underrun_count++;
1012                 dmap->qlen++;
1013                 if ((dmap->flags & DMA_DIRTY) && dmap->applic_profile != APF_CPUINTENS) {
1014                         dmap->flags &= ~DMA_DIRTY;
1015                         memset(adev->dmap_out->raw_buf, adev->dmap_out->neutral_byte,
1016                                adev->dmap_out->buffsize);
1017                 }
1018                 dmap->user_counter += dmap->fragment_size;
1019                 dmap->qtail = (dmap->qtail + 1) % dmap->nbufs;
1020         }
1021         if (dmap->qlen > 0)
1022                 DMAbuf_launch_output(dev, dmap);
1023         finish_output_interrupt(dev, dmap);
1024 }
1025 /* called in irq context */
1026 void DMAbuf_outputintr(int dev, int notify_only)
1027 {
1028         struct audio_operations *adev = audio_devs[dev];
1029         unsigned long flags;
1030         struct dma_buffparms *dmap = adev->dmap_out;
1031
1032         spin_lock_irqsave(&dmap->lock,flags);
1033         if (!(dmap->flags & DMA_NODMA)) {
1034                 int chan = dmap->dma, pos, n;
1035                 unsigned long f;
1036
1037                 f=claim_dma_lock();
1038
1039                 if(!isa_dma_bridge_buggy)
1040                         disable_dma(dmap->dma);
1041                 clear_dma_ff(chan);
1042                 pos = dmap->bytes_in_use - get_dma_residue(chan);
1043                 if(!isa_dma_bridge_buggy)
1044                         enable_dma(dmap->dma);
1045                 release_dma_lock(f);
1046
1047                 pos = pos / dmap->fragment_size;        /* Actual qhead */
1048                 if (pos < 0 || pos >= dmap->nbufs)
1049                         pos = 0;
1050                 n = 0;
1051                 while (dmap->qhead != pos && n++ < dmap->nbufs)
1052                         do_outputintr(dev, notify_only);
1053         }
1054         else
1055                 do_outputintr(dev, notify_only);
1056         spin_unlock_irqrestore(&dmap->lock,flags);
1057 }
1058 /* called with dmap->lock held in irq context */
1059 static void do_inputintr(int dev)
1060 {
1061         struct audio_operations *adev = audio_devs[dev];
1062         struct dma_buffparms *dmap = adev->dmap_in;
1063
1064         if (dmap->raw_buf == NULL) {
1065                 printk(KERN_ERR "Sound: Fatal error. Audio interrupt after freeing buffers.\n");
1066                 return;
1067         }
1068         if (dmap->mapping_flags & DMA_MAP_MAPPED) {
1069                 dmap->qtail = (dmap->qtail + 1) % dmap->nbufs;
1070                 if (dmap->qtail == 0) {         /* Wrapped */
1071                         dmap->byte_counter += dmap->bytes_in_use;
1072                         if (dmap->byte_counter >= dmap->max_byte_counter) {     /* Overflow */
1073                                 long decr = dmap->byte_counter;
1074                                 dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use) + dmap->bytes_in_use;
1075                                 decr -= dmap->byte_counter;
1076                                 dmap->user_counter -= decr;
1077                         }
1078                 }
1079                 dmap->qlen++;
1080
1081                 if (!(adev->flags & DMA_AUTOMODE)) {
1082                         if (dmap->needs_reorg)
1083                                 reorganize_buffers(dev, dmap, 0);
1084                         local_start_dma(adev, dmap->raw_buf_phys, dmap->bytes_in_use,DMA_MODE_READ);
1085                         adev->d->start_input(dev, dmap->raw_buf_phys + dmap->qtail * dmap->fragment_size,
1086                                              dmap->fragment_size, 1);
1087                         if (adev->d->trigger)
1088                                 adev->d->trigger(dev, adev->enable_bits * adev->go);
1089                 }
1090                 dmap->flags |= DMA_ACTIVE;
1091         } else if (dmap->qlen >= (dmap->nbufs - 1)) {
1092                 printk(KERN_WARNING "Sound: Recording overrun\n");
1093                 dmap->underrun_count++;
1094
1095                 /* Just throw away the oldest fragment but keep the engine running */
1096                 dmap->qhead = (dmap->qhead + 1) % dmap->nbufs;
1097                 dmap->qtail = (dmap->qtail + 1) % dmap->nbufs;
1098         } else if (dmap->qlen >= 0 && dmap->qlen < dmap->nbufs) {
1099                 dmap->qlen++;
1100                 dmap->qtail = (dmap->qtail + 1) % dmap->nbufs;
1101                 if (dmap->qtail == 0) {         /* Wrapped */
1102                         dmap->byte_counter += dmap->bytes_in_use;
1103                         if (dmap->byte_counter >= dmap->max_byte_counter) {     /* Overflow */
1104                                 long decr = dmap->byte_counter;
1105                                 dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use) + dmap->bytes_in_use;
1106                                 decr -= dmap->byte_counter;
1107                                 dmap->user_counter -= decr;
1108                         }
1109                 }
1110         }
1111         if (!(adev->flags & DMA_AUTOMODE) || (dmap->flags & DMA_NODMA)) {
1112                 local_start_dma(adev, dmap->raw_buf_phys, dmap->bytes_in_use, DMA_MODE_READ);
1113                 adev->d->start_input(dev, dmap->raw_buf_phys + dmap->qtail * dmap->fragment_size, dmap->fragment_size, 1);
1114                 if (adev->d->trigger)
1115                         adev->d->trigger(dev,adev->enable_bits * adev->go);
1116         }
1117         dmap->flags |= DMA_ACTIVE;
1118         if (dmap->qlen > 0)
1119         {
1120                 wake_up(&adev->in_sleeper);
1121                 wake_up(&adev->poll_sleeper);
1122         }
1123 }
1124 /* called in irq context */
1125 void DMAbuf_inputintr(int dev)
1126 {
1127         struct audio_operations *adev = audio_devs[dev];
1128         struct dma_buffparms *dmap = adev->dmap_in;
1129         unsigned long flags;
1130
1131         spin_lock_irqsave(&dmap->lock,flags);
1132
1133         if (!(dmap->flags & DMA_NODMA)) {
1134                 int chan = dmap->dma, pos, n;
1135                 unsigned long f;
1136
1137                 f=claim_dma_lock();
1138                 if(!isa_dma_bridge_buggy)
1139                         disable_dma(dmap->dma);
1140                 clear_dma_ff(chan);
1141                 pos = dmap->bytes_in_use - get_dma_residue(chan);
1142                 if(!isa_dma_bridge_buggy)
1143                         enable_dma(dmap->dma);
1144                 release_dma_lock(f);
1145
1146                 pos = pos / dmap->fragment_size;        /* Actual qhead */
1147                 if (pos < 0 || pos >= dmap->nbufs)
1148                         pos = 0;
1149
1150                 n = 0;
1151                 while (dmap->qtail != pos && ++n < dmap->nbufs)
1152                         do_inputintr(dev);
1153         } else
1154                 do_inputintr(dev);
1155         spin_unlock_irqrestore(&dmap->lock,flags);
1156 }
1157
1158 int DMAbuf_open_dma(int dev)
1159 {
1160         /*
1161          *    NOTE!  This routine opens only the primary DMA channel (output).
1162          */
1163         struct audio_operations *adev = audio_devs[dev];
1164         int err;
1165
1166         if ((err = open_dmap(adev, OPEN_READWRITE, adev->dmap_out)) < 0)
1167                 return -EBUSY;
1168         dma_init_buffers(adev->dmap_out);
1169         adev->dmap_out->flags |= DMA_ALLOC_DONE;
1170         adev->dmap_out->fragment_size = adev->dmap_out->buffsize;
1171
1172         if (adev->dmap_out->dma >= 0) {
1173                 unsigned long flags;
1174
1175                 flags=claim_dma_lock();
1176                 clear_dma_ff(adev->dmap_out->dma);
1177                 disable_dma(adev->dmap_out->dma);
1178                 release_dma_lock(flags);
1179         }
1180         return 0;
1181 }
1182
1183 void DMAbuf_close_dma(int dev)
1184 {
1185         close_dmap(audio_devs[dev], audio_devs[dev]->dmap_out);
1186 }
1187
1188 void DMAbuf_init(int dev, int dma1, int dma2)
1189 {
1190         struct audio_operations *adev = audio_devs[dev];
1191         /*
1192          * NOTE! This routine could be called several times.
1193          */
1194
1195         /* drag in audio_syms.o */
1196         {
1197                 extern char audio_syms_symbol;
1198                 audio_syms_symbol = 0;
1199         }
1200
1201         if (adev && adev->dmap_out == NULL) {
1202                 if (adev->d == NULL)
1203                         panic("OSS: audio_devs[%d]->d == NULL\n", dev);
1204
1205                 if (adev->parent_dev) {  /* Use DMA map of the parent dev */
1206                         int parent = adev->parent_dev - 1;
1207                         adev->dmap_out = audio_devs[parent]->dmap_out;
1208                         adev->dmap_in = audio_devs[parent]->dmap_in;
1209                 } else {
1210                         adev->dmap_out = adev->dmap_in = &adev->dmaps[0];
1211                         adev->dmap_out->dma = dma1;
1212                         if (adev->flags & DMA_DUPLEX) {
1213                                 adev->dmap_in = &adev->dmaps[1];
1214                                 adev->dmap_in->dma = dma2;
1215                         }
1216                 }
1217                 /* Persistent DMA buffers allocated here */
1218                 if (sound_dmap_flag == DMAP_KEEP_ON_CLOSE) {
1219                         if (adev->dmap_in->raw_buf == NULL)
1220                                 sound_alloc_dmap(adev->dmap_in);
1221                         if (adev->dmap_out->raw_buf == NULL)
1222                                 sound_alloc_dmap(adev->dmap_out);
1223                 }
1224         }
1225 }
1226
1227 /* No kernel lock - DMAbuf_activate_recording protected by global cli/sti */
1228 static unsigned int poll_input(struct file * file, int dev, poll_table *wait)
1229 {
1230         struct audio_operations *adev = audio_devs[dev];
1231         struct dma_buffparms *dmap = adev->dmap_in;
1232
1233         if (!(adev->open_mode & OPEN_READ))
1234                 return 0;
1235         if (dmap->mapping_flags & DMA_MAP_MAPPED) {
1236                 if (dmap->qlen)
1237                         return POLLIN | POLLRDNORM;
1238                 return 0;
1239         }
1240         if (dmap->dma_mode != DMODE_INPUT) {
1241                 if (dmap->dma_mode == DMODE_NONE &&
1242                     adev->enable_bits & PCM_ENABLE_INPUT &&
1243                     !dmap->qlen && adev->go) {
1244                         unsigned long flags;
1245
1246                         spin_lock_irqsave(&dmap->lock,flags);
1247                         DMAbuf_activate_recording(dev, dmap);
1248                         spin_unlock_irqrestore(&dmap->lock,flags);
1249                 }
1250                 return 0;
1251         }
1252         if (!dmap->qlen)
1253                 return 0;
1254         return POLLIN | POLLRDNORM;
1255 }
1256
1257 static unsigned int poll_output(struct file * file, int dev, poll_table *wait)
1258 {
1259         struct audio_operations *adev = audio_devs[dev];
1260         struct dma_buffparms *dmap = adev->dmap_out;
1261
1262         if (!(adev->open_mode & OPEN_WRITE))
1263                 return 0;
1264         if (dmap->mapping_flags & DMA_MAP_MAPPED) {
1265                 if (dmap->qlen)
1266                         return POLLOUT | POLLWRNORM;
1267                 return 0;
1268         }
1269         if (dmap->dma_mode == DMODE_INPUT)
1270                 return 0;
1271         if (dmap->dma_mode == DMODE_NONE)
1272                 return POLLOUT | POLLWRNORM;
1273         if (!DMAbuf_space_in_queue(dev))
1274                 return 0;
1275         return POLLOUT | POLLWRNORM;
1276 }
1277
1278 unsigned int DMAbuf_poll(struct file * file, int dev, poll_table *wait)
1279 {
1280         struct audio_operations *adev = audio_devs[dev];
1281         poll_wait(file, &adev->poll_sleeper, wait);
1282         return poll_input(file, dev, wait) | poll_output(file, dev, wait);
1283 }
1284
1285 void DMAbuf_deinit(int dev)
1286 {
1287         struct audio_operations *adev = audio_devs[dev];
1288         /* This routine is called when driver is being unloaded */
1289         if (!adev)
1290                 return;
1291
1292         /* Persistent DMA buffers deallocated here */
1293         if (sound_dmap_flag == DMAP_KEEP_ON_CLOSE) {
1294                 sound_free_dmap(adev->dmap_out);
1295                 if (adev->flags & DMA_DUPLEX)
1296                         sound_free_dmap(adev->dmap_in);
1297         }
1298 }