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