fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / sound / arm / devdma.c
blobca3bf4ee05a380bfe910dde8eec7c89dd98bfa49
1 /*
2 * linux/sound/arm/devdma.c
4 * Copyright (C) 2003-2004 Russell King, All rights reserved.
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.
10 * ARM DMA shim for ALSA.
12 #include <linux/device.h>
13 #include <linux/dma-mapping.h>
15 #include <sound/driver.h>
16 #include <sound/core.h>
17 #include <sound/pcm.h>
19 #include "devdma.h"
21 void devdma_hw_free(struct device *dev, struct snd_pcm_substream *substream)
23 struct snd_pcm_runtime *runtime = substream->runtime;
24 struct snd_dma_buffer *buf = runtime->dma_buffer_p;
26 if (runtime->dma_area == NULL)
27 return;
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);
34 snd_pcm_set_runtime_buffer(substream, NULL);
37 int devdma_hw_alloc(struct device *dev, struct snd_pcm_substream *substream, size_t size)
39 struct snd_pcm_runtime *runtime = substream->runtime;
40 struct snd_dma_buffer *buf = runtime->dma_buffer_p;
41 int ret = 0;
43 if (buf) {
44 if (buf->bytes >= size)
45 goto out;
46 devdma_hw_free(dev, substream);
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;
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;
62 if (!buf->area)
63 goto free;
65 snd_pcm_set_runtime_buffer(substream, buf);
66 ret = 1;
67 out:
68 runtime->dma_bytes = size;
69 return ret;
71 free:
72 kfree(buf);
73 nomem:
74 return -ENOMEM;
77 int devdma_mmap(struct device *dev, struct snd_pcm_substream *substream, struct vm_area_struct *vma)
79 struct snd_pcm_runtime *runtime = substream->runtime;
80 return dma_mmap_coherent(dev, vma, runtime->dma_area, runtime->dma_addr, runtime->dma_bytes);