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// SPDX-License-Identifier: GPL-2.0-only
/*
* 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
*/
#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 "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,
.prealloc_buffer_size = 128 * 1024,
};
int edma_pcm_platform_register(struct device *dev)
{
struct snd_dmaengine_pcm_config *config;
if (dev->of_node)
return devm_snd_dmaengine_pcm_register(dev,
&edma_dmaengine_pcm_config, 0);
config = devm_kzalloc(dev, sizeof(*config), GFP_KERNEL);
if (!config)
return -ENOMEM;
*config = edma_dmaengine_pcm_config;
config->chan_names[0] = "tx";
config->chan_names[1] = "rx";
return devm_snd_dmaengine_pcm_register(dev, config, 0);
}
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");
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