mirror of
https://github.com/torvalds/linux.git
synced 2024-11-19 10:31:48 +00:00
adaa3229fb
Use the generic dmaengine PCM driver instead of a custom implementation. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Tested-by: Shawn Guo <shawn.guo@linaro.org> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
146 lines
3.6 KiB
C
146 lines
3.6 KiB
C
/*
|
|
* Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
|
|
*
|
|
* This code is based on code copyrighted by Freescale,
|
|
* Liam Girdwood, Javier Martin and probably others.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the
|
|
* Free Software Foundation; either version 2 of the License, or (at your
|
|
* option) any later version.
|
|
*/
|
|
|
|
#include <linux/dma-mapping.h>
|
|
#include <linux/module.h>
|
|
#include <sound/pcm.h>
|
|
#include <sound/soc.h>
|
|
#include "imx-pcm.h"
|
|
|
|
int snd_imx_pcm_mmap(struct snd_pcm_substream *substream,
|
|
struct vm_area_struct *vma)
|
|
{
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
int ret;
|
|
|
|
ret = dma_mmap_writecombine(substream->pcm->card->dev, vma,
|
|
runtime->dma_area, runtime->dma_addr, runtime->dma_bytes);
|
|
|
|
pr_debug("%s: ret: %d %p 0x%08x 0x%08x\n", __func__, ret,
|
|
runtime->dma_area,
|
|
runtime->dma_addr,
|
|
runtime->dma_bytes);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(snd_imx_pcm_mmap);
|
|
|
|
static int imx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
|
|
{
|
|
struct snd_pcm_substream *substream = pcm->streams[stream].substream;
|
|
struct snd_dma_buffer *buf = &substream->dma_buffer;
|
|
size_t size = IMX_SSI_DMABUF_SIZE;
|
|
|
|
buf->dev.type = SNDRV_DMA_TYPE_DEV;
|
|
buf->dev.dev = pcm->card->dev;
|
|
buf->private_data = NULL;
|
|
buf->area = dma_alloc_writecombine(pcm->card->dev, size,
|
|
&buf->addr, GFP_KERNEL);
|
|
if (!buf->area)
|
|
return -ENOMEM;
|
|
buf->bytes = size;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static u64 imx_pcm_dmamask = DMA_BIT_MASK(32);
|
|
|
|
int imx_pcm_new(struct snd_soc_pcm_runtime *rtd)
|
|
{
|
|
struct snd_card *card = rtd->card->snd_card;
|
|
struct snd_pcm *pcm = rtd->pcm;
|
|
int ret = 0;
|
|
|
|
if (!card->dev->dma_mask)
|
|
card->dev->dma_mask = &imx_pcm_dmamask;
|
|
if (!card->dev->coherent_dma_mask)
|
|
card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
|
|
if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
|
|
ret = imx_pcm_preallocate_dma_buffer(pcm,
|
|
SNDRV_PCM_STREAM_PLAYBACK);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
|
|
ret = imx_pcm_preallocate_dma_buffer(pcm,
|
|
SNDRV_PCM_STREAM_CAPTURE);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(imx_pcm_new);
|
|
|
|
void imx_pcm_free(struct snd_pcm *pcm)
|
|
{
|
|
struct snd_pcm_substream *substream;
|
|
struct snd_dma_buffer *buf;
|
|
int stream;
|
|
|
|
for (stream = 0; stream < 2; stream++) {
|
|
substream = pcm->streams[stream].substream;
|
|
if (!substream)
|
|
continue;
|
|
|
|
buf = &substream->dma_buffer;
|
|
if (!buf->area)
|
|
continue;
|
|
|
|
dma_free_writecombine(pcm->card->dev, buf->bytes,
|
|
buf->area, buf->addr);
|
|
buf->area = NULL;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(imx_pcm_free);
|
|
|
|
static int imx_pcm_probe(struct platform_device *pdev)
|
|
{
|
|
if (strcmp(pdev->id_entry->name, "imx-fiq-pcm-audio") == 0)
|
|
return imx_pcm_fiq_init(pdev);
|
|
|
|
return imx_pcm_dma_init(pdev);
|
|
}
|
|
|
|
static int imx_pcm_remove(struct platform_device *pdev)
|
|
{
|
|
if (strcmp(pdev->id_entry->name, "imx-fiq-pcm-audio") == 0)
|
|
snd_soc_unregister_platform(&pdev->dev);
|
|
else
|
|
imx_pcm_dma_exit(pdev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_device_id imx_pcm_devtype[] = {
|
|
{ .name = "imx-pcm-audio", },
|
|
{ .name = "imx-fiq-pcm-audio", },
|
|
{ /* sentinel */ }
|
|
};
|
|
MODULE_DEVICE_TABLE(platform, imx_pcm_devtype);
|
|
|
|
static struct platform_driver imx_pcm_driver = {
|
|
.driver = {
|
|
.name = "imx-pcm",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.id_table = imx_pcm_devtype,
|
|
.probe = imx_pcm_probe,
|
|
.remove = imx_pcm_remove,
|
|
};
|
|
module_platform_driver(imx_pcm_driver);
|
|
|
|
MODULE_DESCRIPTION("Freescale i.MX PCM driver");
|
|
MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
|
|
MODULE_LICENSE("GPL");
|