imx-pcm-dma.c
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/*
* imx-pcm-dma-mx2.c -- ALSA Soc Audio Layer
*
* 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/platform_device.h>
#include <linux/dmaengine.h>
#include <linux/types.h>
#include <linux/module.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/soc.h>
#include <sound/dmaengine_pcm.h>
#include "imx-pcm.h"
static bool filter(struct dma_chan *chan, void *param)
{
if (!imx_dma_is_general_purpose(chan))
return false;
chan->private = param;
return true;
}
static const struct snd_pcm_hardware imx_pcm_hardware = {
.info = SNDRV_PCM_INFO_INTERLEAVED |
SNDRV_PCM_INFO_BLOCK_TRANSFER |
SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_MMAP_VALID |
SNDRV_PCM_INFO_PAUSE |
SNDRV_PCM_INFO_RESUME,
.buffer_bytes_max = IMX_DEFAULT_DMABUF_SIZE,
.period_bytes_min = 128,
.period_bytes_max = 65535, /* Limited by SDMA engine */
.periods_min = 2,
.periods_max = 255,
.fifo_size = 0,
};
static void imx_pcm_dma_complete(void *arg)
{
struct snd_pcm_substream *substream = arg;
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct dmaengine_pcm_runtime_data *prtd = substream->runtime->private_data;
struct snd_dmaengine_dai_dma_data *dma_data;
prtd->pos += snd_pcm_lib_period_bytes(substream);
if (prtd->pos >= snd_pcm_lib_buffer_bytes(substream))
prtd->pos = 0;
snd_pcm_period_elapsed(substream);
dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
if (dma_data->check_xrun && dma_data->check_xrun(substream))
dma_data->device_reset(substream, 1);
}
static int imx_pcm_dma_prepare_slave_config(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params, struct dma_slave_config *slave_config)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_dmaengine_dai_dma_data *dma_data;
struct dmaengine_pcm_runtime_data *prtd = substream->runtime->private_data;
int ret;
dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
prtd->callback = imx_pcm_dma_complete;
ret = snd_hwparams_to_dma_slave_config(substream, params, slave_config);
if (ret)
return ret;
snd_dmaengine_pcm_set_config_from_dai_data(substream, dma_data,
slave_config);
return 0;
}
static const struct snd_dmaengine_pcm_config imx_dmaengine_pcm_config = {
.pcm_hardware = &imx_pcm_hardware,
.prepare_slave_config = imx_pcm_dma_prepare_slave_config,
.compat_filter_fn = filter,
.prealloc_buffer_size = IMX_DEFAULT_DMABUF_SIZE,
};
int imx_pcm_dma_init(struct platform_device *pdev, size_t size)
{
struct snd_dmaengine_pcm_config *config;
struct snd_pcm_hardware *pcm_hardware;
config = devm_kzalloc(&pdev->dev,
sizeof(struct snd_dmaengine_pcm_config), GFP_KERNEL);
*config = imx_dmaengine_pcm_config;
if (size)
config->prealloc_buffer_size = size;
pcm_hardware = devm_kzalloc(&pdev->dev,
sizeof(struct snd_pcm_hardware), GFP_KERNEL);
*pcm_hardware = imx_pcm_hardware;
if (size)
pcm_hardware->buffer_bytes_max = size;
config->pcm_hardware = pcm_hardware;
return devm_snd_dmaengine_pcm_register(&pdev->dev,
config,
SND_DMAENGINE_PCM_FLAG_COMPAT);
}
EXPORT_SYMBOL_GPL(imx_pcm_dma_init);
MODULE_LICENSE("GPL");