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