mirror of https://gitee.com/openkylin/linux.git
64 lines
1.7 KiB
C
64 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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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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#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 "edma-pcm.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_PAUSE | SNDRV_PCM_INFO_RESUME |
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SNDRV_PCM_INFO_NO_PERIOD_WAKEUP |
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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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.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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struct snd_dmaengine_pcm_config *config;
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if (dev->of_node)
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return devm_snd_dmaengine_pcm_register(dev,
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&edma_dmaengine_pcm_config, 0);
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config = devm_kzalloc(dev, sizeof(*config), GFP_KERNEL);
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if (!config)
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return -ENOMEM;
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*config = edma_dmaengine_pcm_config;
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config->chan_names[0] = "tx";
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config->chan_names[1] = "rx";
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return devm_snd_dmaengine_pcm_register(dev, config, 0);
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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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