static int open_dmap(struct audio_operations *adev, int mode, struct dma_buffparms *dmap)
{
int err;
if (dmap->flags & DMA_BUSY)
return -EBUSY;
if ((err = sound_alloc_dmap(dmap)) < 0)
return err;
if (dmap->raw_buf == NULL) {
printk(KERN_WARNING "Sound: DMA buffers not available\n");
return -ENOSPC; /* Memory allocation failed during boot */
}
if (dmap->dma >= 0 && sound_open_dma(dmap->dma, adev->name)) {
printk(KERN_WARNING "Unable to grab(2) DMA%d for the audio driver\n", dmap->dma);
return -EBUSY;
}
dma_init_buffers(dmap);
spin_lock_init(&dmap->lock);
dmap->open_mode = mode;
dmap->subdivision = dmap->underrun_count = 0;
dmap->fragment_size = 0;
dmap->max_fragments = 65536; /* Just a large value */
dmap->byte_counter = 0;
dmap->max_byte_counter = 8000 * 60 * 60;
dmap->applic_profile = APF_NORMAL;
dmap->needs_reorg = 1;
dmap->audio_callback = NULL;
dmap->callback_parm = 0;
return 0;
}
int DMAbuf_open_dma(int dev)
{
/*
* NOTE! This routine opens only the primary DMA channel (output).
*/
struct audio_operations *adev = audio_devs[dev];
int err;
if ((err = open_dmap(adev, OPEN_READWRITE, adev->dmap_out)) < 0)
return -EBUSY;
dma_init_buffers(adev->dmap_out);
adev->dmap_out->flags |= DMA_ALLOC_DONE;
adev->dmap_out->fragment_size = adev->dmap_out->buffsize;
if (adev->dmap_out->dma >= 0) {
unsigned long flags;
flags=claim_dma_lock();
clear_dma_ff(adev->dmap_out->dma);
disable_dma(adev->dmap_out->dma);
release_dma_lock(flags);
}
return 0;
}
