| Shawn Guo | 4762fba | 2012-03-05 22:30:55 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de> |
| 3 | * |
| 4 | * This code is based on code copyrighted by Freescale, |
| 5 | * Liam Girdwood, Javier Martin and probably others. |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify it |
| 8 | * under the terms of the GNU General Public License as published by the |
| 9 | * Free Software Foundation; either version 2 of the License, or (at your |
| 10 | * option) any later version. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/dma-mapping.h> |
| 14 | #include <linux/module.h> |
| 15 | #include <sound/pcm.h> |
| 16 | #include <sound/soc.h> |
| 17 | #include "imx-pcm.h" |
| 18 | |
| 19 | int snd_imx_pcm_mmap(struct snd_pcm_substream *substream, |
| 20 | struct vm_area_struct *vma) |
| 21 | { |
| 22 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 23 | int ret; |
| 24 | |
| 25 | ret = dma_mmap_writecombine(substream->pcm->card->dev, vma, |
| 26 | runtime->dma_area, runtime->dma_addr, runtime->dma_bytes); |
| 27 | |
| 28 | pr_debug("%s: ret: %d %p 0x%08x 0x%08x\n", __func__, ret, |
| 29 | runtime->dma_area, |
| 30 | runtime->dma_addr, |
| 31 | runtime->dma_bytes); |
| 32 | return ret; |
| 33 | } |
| 34 | EXPORT_SYMBOL_GPL(snd_imx_pcm_mmap); |
| 35 | |
| 36 | static int imx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream) |
| 37 | { |
| 38 | struct snd_pcm_substream *substream = pcm->streams[stream].substream; |
| 39 | struct snd_dma_buffer *buf = &substream->dma_buffer; |
| 40 | size_t size = IMX_SSI_DMABUF_SIZE; |
| 41 | |
| 42 | buf->dev.type = SNDRV_DMA_TYPE_DEV; |
| 43 | buf->dev.dev = pcm->card->dev; |
| 44 | buf->private_data = NULL; |
| 45 | buf->area = dma_alloc_writecombine(pcm->card->dev, size, |
| 46 | &buf->addr, GFP_KERNEL); |
| 47 | if (!buf->area) |
| 48 | return -ENOMEM; |
| 49 | buf->bytes = size; |
| 50 | |
| 51 | return 0; |
| 52 | } |
| 53 | |
| 54 | static u64 imx_pcm_dmamask = DMA_BIT_MASK(32); |
| 55 | |
| 56 | int imx_pcm_new(struct snd_soc_pcm_runtime *rtd) |
| 57 | { |
| 58 | struct snd_card *card = rtd->card->snd_card; |
| 59 | struct snd_pcm *pcm = rtd->pcm; |
| 60 | int ret = 0; |
| 61 | |
| 62 | if (!card->dev->dma_mask) |
| 63 | card->dev->dma_mask = &imx_pcm_dmamask; |
| 64 | if (!card->dev->coherent_dma_mask) |
| 65 | card->dev->coherent_dma_mask = DMA_BIT_MASK(32); |
| 66 | if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) { |
| 67 | ret = imx_pcm_preallocate_dma_buffer(pcm, |
| 68 | SNDRV_PCM_STREAM_PLAYBACK); |
| 69 | if (ret) |
| 70 | goto out; |
| 71 | } |
| 72 | |
| 73 | if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) { |
| 74 | ret = imx_pcm_preallocate_dma_buffer(pcm, |
| 75 | SNDRV_PCM_STREAM_CAPTURE); |
| 76 | if (ret) |
| 77 | goto out; |
| 78 | } |
| 79 | |
| 80 | out: |
| 81 | return ret; |
| 82 | } |
| 83 | EXPORT_SYMBOL_GPL(imx_pcm_new); |
| 84 | |
| 85 | void imx_pcm_free(struct snd_pcm *pcm) |
| 86 | { |
| 87 | struct snd_pcm_substream *substream; |
| 88 | struct snd_dma_buffer *buf; |
| 89 | int stream; |
| 90 | |
| 91 | for (stream = 0; stream < 2; stream++) { |
| 92 | substream = pcm->streams[stream].substream; |
| 93 | if (!substream) |
| 94 | continue; |
| 95 | |
| 96 | buf = &substream->dma_buffer; |
| 97 | if (!buf->area) |
| 98 | continue; |
| 99 | |
| 100 | dma_free_writecombine(pcm->card->dev, buf->bytes, |
| 101 | buf->area, buf->addr); |
| 102 | buf->area = NULL; |
| 103 | } |
| 104 | } |
| 105 | EXPORT_SYMBOL_GPL(imx_pcm_free); |