68 lines
1.8 KiB
C
68 lines
1.8 KiB
C
/*
|
|
* 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_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 devm_snd_dmaengine_pcm_register(&pdev->dev,
|
|
&imx_dmaengine_pcm_config,
|
|
SND_DMAENGINE_PCM_FLAG_NO_RESIDUE |
|
|
SND_DMAENGINE_PCM_FLAG_COMPAT);
|
|
}
|
|
EXPORT_SYMBOL_GPL(imx_pcm_dma_init);
|
|
|
|
MODULE_LICENSE("GPL");
|