86 lines
2.3 KiB
C
86 lines
2.3 KiB
C
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/*
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* imx-pcm-dma-mx2.c -- ALSA Soc Audio Layer
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*
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* Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
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*
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* This code is based on code copyrighted by Freescale,
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* Liam Girdwood, Javier Martin and probably others.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/platform_device.h>
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#include <linux/dmaengine.h>
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#include <linux/types.h>
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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/soc.h>
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#include <sound/dmaengine_pcm.h>
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#include "imx-pcm.h"
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static bool filter(struct dma_chan *chan, void *param)
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{
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if (!imx_dma_is_general_purpose(chan))
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return false;
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chan->private = param;
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return true;
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}
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static const struct snd_pcm_hardware imx_pcm_hardware = {
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.info = SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_BLOCK_TRANSFER |
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SNDRV_PCM_INFO_MMAP |
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SNDRV_PCM_INFO_MMAP_VALID |
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SNDRV_PCM_INFO_PAUSE |
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SNDRV_PCM_INFO_RESUME,
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.buffer_bytes_max = IMX_DEFAULT_DMABUF_SIZE,
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.period_bytes_min = 128,
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.period_bytes_max = 65535, /* Limited by SDMA engine */
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.periods_min = 2,
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.periods_max = 255,
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.fifo_size = 0,
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};
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static const struct snd_dmaengine_pcm_config imx_dmaengine_pcm_config = {
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.pcm_hardware = &imx_pcm_hardware,
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.prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
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.compat_filter_fn = filter,
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.prealloc_buffer_size = IMX_DEFAULT_DMABUF_SIZE,
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};
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int imx_pcm_dma_init(struct platform_device *pdev, size_t size)
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{
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struct snd_dmaengine_pcm_config *config;
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struct snd_pcm_hardware *pcm_hardware;
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config = devm_kzalloc(&pdev->dev,
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sizeof(struct snd_dmaengine_pcm_config), GFP_KERNEL);
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if (!config)
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return -ENOMEM;
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*config = imx_dmaengine_pcm_config;
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if (size)
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config->prealloc_buffer_size = size;
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pcm_hardware = devm_kzalloc(&pdev->dev,
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sizeof(struct snd_pcm_hardware), GFP_KERNEL);
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*pcm_hardware = imx_pcm_hardware;
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if (size)
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pcm_hardware->buffer_bytes_max = size;
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config->pcm_hardware = pcm_hardware;
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return devm_snd_dmaengine_pcm_register(&pdev->dev,
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config,
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SND_DMAENGINE_PCM_FLAG_COMPAT);
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}
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EXPORT_SYMBOL_GPL(imx_pcm_dma_init);
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MODULE_LICENSE("GPL");
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