diff options
author | Russell King <rmk@arm.linux.org.uk> | 2005-05-12 04:25:58 -0400 |
---|---|---|
committer | Jaroslav Kysela <perex@suse.cz> | 2005-05-29 04:06:49 -0400 |
commit | 9b9a5afffd8636a82c6b32970342aef9d1f3d17d (patch) | |
tree | 459b442ae9d43f988c3dcd1b6cf154fd76b1861b /sound/arm | |
parent | f7de9cfd25b6867a2854d98d734e03e1a9fc65fb (diff) |
[ALSA] ARM DMA subsystem
ARM DMA routines
The patch below adds a convenient re-usable shim around the extended
ARM DMA API, and is used by several ARM ALSA drivers.
Signed-off-by: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/arm')
-rw-r--r-- | sound/arm/devdma.c | 81 | ||||
-rw-r--r-- | sound/arm/devdma.h | 3 |
2 files changed, 84 insertions, 0 deletions
diff --git a/sound/arm/devdma.c b/sound/arm/devdma.c new file mode 100644 index 000000000000..60826a5324b4 --- /dev/null +++ b/sound/arm/devdma.c | |||
@@ -0,0 +1,81 @@ | |||
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 | |||
15 | #include <sound/driver.h> | ||
16 | #include <sound/core.h> | ||
17 | #include <sound/pcm.h> | ||
18 | |||
19 | #include "devdma.h" | ||
20 | |||
21 | void devdma_hw_free(struct device *dev, snd_pcm_substream_t *substream) | ||
22 | { | ||
23 | snd_pcm_runtime_t *runtime = substream->runtime; | ||
24 | 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 | |||
37 | int devdma_hw_alloc(struct device *dev, snd_pcm_substream_t *substream, size_t size) | ||
38 | { | ||
39 | snd_pcm_runtime_t *runtime = substream->runtime; | ||
40 | 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 | |||
77 | int devdma_mmap(struct device *dev, snd_pcm_substream_t *substream, struct vm_area_struct *vma) | ||
78 | { | ||
79 | snd_pcm_runtime_t *runtime = substream->runtime; | ||
80 | return dma_mmap_coherent(dev, vma, runtime->dma_area, runtime->dma_addr, runtime->dma_bytes); | ||
81 | } | ||
diff --git a/sound/arm/devdma.h b/sound/arm/devdma.h new file mode 100644 index 000000000000..5a33b6bacc34 --- /dev/null +++ b/sound/arm/devdma.h | |||
@@ -0,0 +1,3 @@ | |||
1 | void devdma_hw_free(struct device *dev, snd_pcm_substream_t *substream); | ||
2 | int devdma_hw_alloc(struct device *dev, snd_pcm_substream_t *substream, size_t size); | ||
3 | int devdma_mmap(struct device *dev, snd_pcm_substream_t *substream, struct vm_area_struct *vma); | ||