Commit | Line | Data |
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9b9a5aff RK |
1 | /* |
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 | ||
9b9a5aff RK |
15 | #include <sound/core.h> |
16 | #include <sound/pcm.h> | |
17 | ||
18 | #include "devdma.h" | |
19 | ||
ceb9e476 | 20 | void devdma_hw_free(struct device *dev, struct snd_pcm_substream *substream) |
9b9a5aff | 21 | { |
ceb9e476 | 22 | struct snd_pcm_runtime *runtime = substream->runtime; |
9b9a5aff RK |
23 | struct snd_dma_buffer *buf = runtime->dma_buffer_p; |
24 | ||
25 | if (runtime->dma_area == NULL) | |
26 | return; | |
27 | ||
28 | if (buf != &substream->dma_buffer) { | |
29 | dma_free_coherent(buf->dev.dev, buf->bytes, buf->area, buf->addr); | |
30 | kfree(runtime->dma_buffer_p); | |
31 | } | |
32 | ||
33 | snd_pcm_set_runtime_buffer(substream, NULL); | |
34 | } | |
35 | ||
ceb9e476 | 36 | int devdma_hw_alloc(struct device *dev, struct snd_pcm_substream *substream, size_t size) |
9b9a5aff | 37 | { |
ceb9e476 | 38 | struct snd_pcm_runtime *runtime = substream->runtime; |
9b9a5aff RK |
39 | struct snd_dma_buffer *buf = runtime->dma_buffer_p; |
40 | int ret = 0; | |
41 | ||
42 | if (buf) { | |
43 | if (buf->bytes >= size) | |
44 | goto out; | |
45 | devdma_hw_free(dev, substream); | |
46 | } | |
47 | ||
48 | if (substream->dma_buffer.area != NULL && substream->dma_buffer.bytes >= size) { | |
49 | buf = &substream->dma_buffer; | |
50 | } else { | |
51 | buf = kmalloc(sizeof(struct snd_dma_buffer), GFP_KERNEL); | |
52 | if (!buf) | |
53 | goto nomem; | |
54 | ||
55 | buf->dev.type = SNDRV_DMA_TYPE_DEV; | |
56 | buf->dev.dev = dev; | |
57 | buf->area = dma_alloc_coherent(dev, size, &buf->addr, GFP_KERNEL); | |
58 | buf->bytes = size; | |
59 | buf->private_data = NULL; | |
60 | ||
61 | if (!buf->area) | |
62 | goto free; | |
63 | } | |
64 | snd_pcm_set_runtime_buffer(substream, buf); | |
65 | ret = 1; | |
66 | out: | |
67 | runtime->dma_bytes = size; | |
68 | return ret; | |
69 | ||
70 | free: | |
71 | kfree(buf); | |
72 | nomem: | |
73 | return -ENOMEM; | |
74 | } | |
75 | ||
ceb9e476 | 76 | int devdma_mmap(struct device *dev, struct snd_pcm_substream *substream, struct vm_area_struct *vma) |
9b9a5aff | 77 | { |
ceb9e476 | 78 | struct snd_pcm_runtime *runtime = substream->runtime; |
9b9a5aff RK |
79 | return dma_mmap_coherent(dev, vma, runtime->dma_area, runtime->dma_addr, runtime->dma_bytes); |
80 | } |