sound/oss/dmabuf.c

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