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Commit 58726f58 authored by Peter Ujfalusi's avatar Peter Ujfalusi Committed by Mark Brown
Browse files

ASoC: davinci: Add edma dmaengine platform driver 



Platform driver glue for SoC using eDMA3 to use dmaengine PCM.
The maximum number of periods need to be limited to 19 since the
edma dmaengine driver limits the paRAM slot use for audio at
in cyclic mode.

Signed-off-by: default avatarPeter Ujfalusi <peter.ujfalusi@ti.com>
Reviewed-by: default avatarLars-Peter Clausen <lars@metafoo.de>
Signed-off-by: default avatarMark Brown <broonie@linaro.org>
parent d343a660

sound/soc/davinci/edma-pcm.c

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Original line number Diff line number Diff line 
/*

 * 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>



static const struct snd_pcm_hardware edma_pcm_hardware = {

	.info			= SNDRV_PCM_INFO_MMAP |

				  SNDRV_PCM_INFO_MMAP_VALID |

				  SNDRV_PCM_INFO_BATCH |

				  SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME |

				  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");

sound/soc/davinci/edma-pcm.h

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Original line number Diff line number Diff line 
/*

 * edma-pcm.h - 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.h

 *

 * 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.

 */



#ifndef __EDMA_PCM_H__

#define __EDMA_PCM_H__



int edma_pcm_platform_register(struct device *dev);



#endif /* __EDMA_PCM_H__ */