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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 <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)
{
struct snd_dmaengine_dai_dma_data *dma_data = param;
if (!imx_dma_is_general_purpose(chan))
return false;
chan->private = dma_data->filter_data;
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,
.formats = SNDRV_PCM_FMTBIT_S16_LE,
.rate_min = 8000,
.channels_min = 2,
.channels_max = 2,
.buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
.period_bytes_min = 128,
.period_bytes_max = 65535, /* Limited by SDMA engine */
.periods_min = 2,
.periods_max = 255,
.fifo_size = 0,
};
static const struct snd_dmaengine_pcm_config imx_dmaengine_pcm_config = {
.pcm_hardware = &imx_pcm_hardware,
.prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
.compat_filter_fn = filter,
.prealloc_buffer_size = IMX_SSI_DMABUF_SIZE,
};
int imx_pcm_dma_init(struct platform_device *pdev)
{
return snd_dmaengine_pcm_register(&pdev->dev, &imx_dmaengine_pcm_config,
SND_DMAENGINE_PCM_FLAG_NO_RESIDUE |
SND_DMAENGINE_PCM_FLAG_NO_DT |
SND_DMAENGINE_PCM_FLAG_COMPAT);
}
void imx_pcm_dma_exit(struct platform_device *pdev)
{
snd_dmaengine_pcm_unregister(&pdev->dev);
}
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