1// SPDX-License-Identifier: GPL-2.0-or-later
 2/*
 3 * imx-pcm-dma-mx2.c  --  ALSA Soc Audio Layer
 4 *
 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");