blob: ca3bf4ee05a380bfe910dde8eec7c89dd98bfa49 [file] [log] [blame]
Russell King9b9a5af2005-05-12 10:25:58 +02001/*
2 * linux/sound/arm/devdma.c
3 *
4 * Copyright (C) 2003-2004 Russell King, All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * ARM DMA shim for ALSA.
11 */
12#include <linux/device.h>
13#include <linux/dma-mapping.h>
14
15#include <sound/driver.h>
16#include <sound/core.h>
17#include <sound/pcm.h>
18
19#include "devdma.h"
20
Takashi Iwaiceb9e472005-11-17 15:10:16 +010021void devdma_hw_free(struct device *dev, struct snd_pcm_substream *substream)
Russell King9b9a5af2005-05-12 10:25:58 +020022{
Takashi Iwaiceb9e472005-11-17 15:10:16 +010023 struct snd_pcm_runtime *runtime = substream->runtime;
Russell King9b9a5af2005-05-12 10:25:58 +020024 struct snd_dma_buffer *buf = runtime->dma_buffer_p;
25
26 if (runtime->dma_area == NULL)
27 return;
28
29 if (buf != &substream->dma_buffer) {
30 dma_free_coherent(buf->dev.dev, buf->bytes, buf->area, buf->addr);
31 kfree(runtime->dma_buffer_p);
32 }
33
34 snd_pcm_set_runtime_buffer(substream, NULL);
35}
36
Takashi Iwaiceb9e472005-11-17 15:10:16 +010037int devdma_hw_alloc(struct device *dev, struct snd_pcm_substream *substream, size_t size)
Russell King9b9a5af2005-05-12 10:25:58 +020038{
Takashi Iwaiceb9e472005-11-17 15:10:16 +010039 struct snd_pcm_runtime *runtime = substream->runtime;
Russell King9b9a5af2005-05-12 10:25:58 +020040 struct snd_dma_buffer *buf = runtime->dma_buffer_p;
41 int ret = 0;
42
43 if (buf) {
44 if (buf->bytes >= size)
45 goto out;
46 devdma_hw_free(dev, substream);
47 }
48
49 if (substream->dma_buffer.area != NULL && substream->dma_buffer.bytes >= size) {
50 buf = &substream->dma_buffer;
51 } else {
52 buf = kmalloc(sizeof(struct snd_dma_buffer), GFP_KERNEL);
53 if (!buf)
54 goto nomem;
55
56 buf->dev.type = SNDRV_DMA_TYPE_DEV;
57 buf->dev.dev = dev;
58 buf->area = dma_alloc_coherent(dev, size, &buf->addr, GFP_KERNEL);
59 buf->bytes = size;
60 buf->private_data = NULL;
61
62 if (!buf->area)
63 goto free;
64 }
65 snd_pcm_set_runtime_buffer(substream, buf);
66 ret = 1;
67 out:
68 runtime->dma_bytes = size;
69 return ret;
70
71 free:
72 kfree(buf);
73 nomem:
74 return -ENOMEM;
75}
76
Takashi Iwaiceb9e472005-11-17 15:10:16 +010077int devdma_mmap(struct device *dev, struct snd_pcm_substream *substream, struct vm_area_struct *vma)
Russell King9b9a5af2005-05-12 10:25:58 +020078{
Takashi Iwaiceb9e472005-11-17 15:10:16 +010079 struct snd_pcm_runtime *runtime = substream->runtime;
Russell King9b9a5af2005-05-12 10:25:58 +020080 return dma_mmap_coherent(dev, vma, runtime->dma_area, runtime->dma_addr, runtime->dma_bytes);
81}