1 /*
2 * imx-pcm-dma-mx2.c -- ALSA Soc Audio Layer
3 *
4 * Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
5 *
6 * This code is based on code copyrighted by Freescale,
7 * Liam Girdwood, Javier Martin and probably others.
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
13 */
14 #include <linux/platform_device.h>
15 #include <linux/dmaengine.h>
16 #include <linux/types.h>
17 #include <linux/module.h>
18
19 #include <sound/core.h>
20 #include <sound/pcm.h>
21 #include <sound/soc.h>
22 #include <sound/dmaengine_pcm.h>
23
24 #include "imx-pcm.h"
25
filter(struct dma_chan * chan,void * param)26 static bool filter(struct dma_chan *chan, void *param)
27 {
28 if (!imx_dma_is_general_purpose(chan))
29 return false;
30
31 chan->private = param;
32
33 return true;
34 }
35
36 static const struct snd_dmaengine_pcm_config imx_dmaengine_pcm_config = {
37 .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
38 .compat_filter_fn = filter,
39 };
40
imx_pcm_dma_init(struct platform_device * pdev,size_t size)41 int imx_pcm_dma_init(struct platform_device *pdev, size_t size)
42 {
43 struct snd_dmaengine_pcm_config *config;
44
45 config = devm_kzalloc(&pdev->dev,
46 sizeof(struct snd_dmaengine_pcm_config), GFP_KERNEL);
47 if (!config)
48 return -ENOMEM;
49 *config = imx_dmaengine_pcm_config;
50
51 return devm_snd_dmaengine_pcm_register(&pdev->dev,
52 config,
53 SND_DMAENGINE_PCM_FLAG_COMPAT);
54 }
55 EXPORT_SYMBOL_GPL(imx_pcm_dma_init);
56
57 MODULE_LICENSE("GPL");
58
