projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | ||
| 15 | #include <sound/driver.h> | |
| 16 | #include <sound/core.h> | |
| 17 | #include <sound/pcm.h> | |
| 18 | ||
| 19 | #include "devdma.h" | |
| 20 | ||
| ceb9e476 | 21 | void devdma_hw_free(struct device *dev, struct snd_pcm_substream *substream) |
| 9b9a5aff | 22 | { |
| ceb9e476 | 23 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 9b9a5aff RK |
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 | ||
| ceb9e476 | 37 | int devdma_hw_alloc(struct device *dev, struct snd_pcm_substream *substream, size_t size) |
| 9b9a5aff | 38 | { |
| ceb9e476 | 39 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 9b9a5aff RK |
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 | ||
| ceb9e476 | 77 | int devdma_mmap(struct device *dev, struct snd_pcm_substream *substream, struct vm_area_struct *vma) |
| 9b9a5aff | 78 | { |
| ceb9e476 | 79 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 9b9a5aff RK |
80 | return dma_mmap_coherent(dev, vma, runtime->dma_area, runtime->dma_addr, runtime->dma_bytes); |
| 81 | } |