59 lines
1.8 KiB
C
59 lines
1.8 KiB
C
/*
|
|
* edma-pcm.c - eDMA PCM driver using dmaengine for AM3xxx, AM4xxx
|
|
*
|
|
* Copyright (C) 2014 Texas Instruments, Inc.
|
|
*
|
|
* Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
|
|
*
|
|
* Based on: sound/soc/tegra/tegra_pcm.c
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* version 2 as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <sound/core.h>
|
|
#include <sound/pcm.h>
|
|
#include <sound/pcm_params.h>
|
|
#include <sound/soc.h>
|
|
#include <sound/dmaengine_pcm.h>
|
|
#include <linux/edma.h>
|
|
|
|
#include "edma-pcm.h"
|
|
|
|
static const struct snd_pcm_hardware edma_pcm_hardware = {
|
|
.info = SNDRV_PCM_INFO_MMAP |
|
|
SNDRV_PCM_INFO_MMAP_VALID |
|
|
SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME |
|
|
SNDRV_PCM_INFO_NO_PERIOD_WAKEUP |
|
|
SNDRV_PCM_INFO_INTERLEAVED,
|
|
.buffer_bytes_max = 128 * 1024,
|
|
.period_bytes_min = 32,
|
|
.period_bytes_max = 64 * 1024,
|
|
.periods_min = 2,
|
|
.periods_max = 19, /* Limit by edma dmaengine driver */
|
|
};
|
|
|
|
static const struct snd_dmaengine_pcm_config edma_dmaengine_pcm_config = {
|
|
.pcm_hardware = &edma_pcm_hardware,
|
|
.prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
|
|
.compat_filter_fn = edma_filter_fn,
|
|
.prealloc_buffer_size = 128 * 1024,
|
|
};
|
|
|
|
int edma_pcm_platform_register(struct device *dev)
|
|
{
|
|
return devm_snd_dmaengine_pcm_register(dev, &edma_dmaengine_pcm_config,
|
|
SND_DMAENGINE_PCM_FLAG_COMPAT);
|
|
}
|
|
EXPORT_SYMBOL_GPL(edma_pcm_platform_register);
|
|
|
|
MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
|
|
MODULE_DESCRIPTION("eDMA PCM ASoC platform driver");
|
|
MODULE_LICENSE("GPL");
|