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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/clk.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/dmaengine.h>
#include <linux/types.h>
#include <sound/core.h>
#include <sound/initval.h>
#include <sound/pcm.h>
#include <sound/pcm_params.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 int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
struct dma_slave_config slave_config;
int ret;
ret = snd_hwparams_to_dma_slave_config(substream, params, &slave_config);
if (ret)
return ret;
snd_dmaengine_pcm_set_config_from_dai_data(substream,
snd_soc_dai_get_dma_data(rtd->cpu_dai, substream),
&slave_config);
ret = dmaengine_slave_config(chan, &slave_config);
if (ret)
return ret;
snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
return 0;
}
static struct snd_pcm_hardware snd_imx_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 int snd_imx_open(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
return snd_dmaengine_pcm_open(substream, filter,
snd_soc_dai_get_dma_data(rtd->cpu_dai, substream));
}
static struct snd_pcm_ops imx_pcm_ops = {
.open = snd_imx_open,
.close = snd_dmaengine_pcm_close,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = snd_imx_pcm_hw_params,
.trigger = snd_dmaengine_pcm_trigger,
.pointer = snd_dmaengine_pcm_pointer_no_residue,
.mmap = snd_imx_pcm_mmap,
};
static struct snd_soc_platform_driver imx_soc_platform_mx2 = {
.ops = &imx_pcm_ops,
.pcm_new = imx_pcm_new,
.pcm_free = imx_pcm_free,
};
int imx_pcm_dma_init(struct platform_device *pdev)
{
return snd_soc_register_platform(&pdev->dev, &imx_soc_platform_mx2);
}
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