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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * imx-pcm-dma-mx2.c -- ALSA Soc Audio Layer4 *5 * Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>6 *7 * This code is based on code copyrighted by Freescale,8 * Liam Girdwood, Javier Martin and probably others.9 */10#include <linux/platform_device.h>11#include <linux/dmaengine.h>12#include <linux/types.h>13#include <linux/module.h>14 15#include <sound/core.h>16#include <sound/pcm.h>17#include <sound/soc.h>18#include <sound/dmaengine_pcm.h>19 20#include "imx-pcm.h"21 22static bool filter(struct dma_chan *chan, void *param)23{24 if (!imx_dma_is_general_purpose(chan))25 return false;26 27 chan->private = param;28 29 return true;30}31 32static const struct snd_dmaengine_pcm_config imx_dmaengine_pcm_config = {33 .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,34 .compat_filter_fn = filter,35};36 37int imx_pcm_dma_init(struct platform_device *pdev)38{39 struct snd_dmaengine_pcm_config *config;40 41 config = devm_kzalloc(&pdev->dev,42 sizeof(struct snd_dmaengine_pcm_config), GFP_KERNEL);43 if (!config)44 return -ENOMEM;45 *config = imx_dmaengine_pcm_config;46 47 return devm_snd_dmaengine_pcm_register(&pdev->dev,48 config,49 SND_DMAENGINE_PCM_FLAG_COMPAT);50}51EXPORT_SYMBOL_GPL(imx_pcm_dma_init);52 53MODULE_DESCRIPTION("Freescale i.MX PCM DMA interface");54MODULE_LICENSE("GPL");55