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
26static 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
36static const struct snd_pcm_hardware imx_pcm_hardware = {
37	.info = SNDRV_PCM_INFO_INTERLEAVED |
38		SNDRV_PCM_INFO_BLOCK_TRANSFER |
39		SNDRV_PCM_INFO_MMAP |
40		SNDRV_PCM_INFO_MMAP_VALID |
41		SNDRV_PCM_INFO_PAUSE |
42		SNDRV_PCM_INFO_RESUME,
43	.buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
44	.period_bytes_min = 128,
45	.period_bytes_max = 65535, /* Limited by SDMA engine */
46	.periods_min = 2,
47	.periods_max = 255,
48	.fifo_size = 0,
49};
50
51static const struct snd_dmaengine_pcm_config imx_dmaengine_pcm_config = {
52	.pcm_hardware = &imx_pcm_hardware,
53	.prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
54	.compat_filter_fn = filter,
55	.prealloc_buffer_size = IMX_SSI_DMABUF_SIZE,
56};
57
58int imx_pcm_dma_init(struct platform_device *pdev)
59{
60	return devm_snd_dmaengine_pcm_register(&pdev->dev,
61		&imx_dmaengine_pcm_config,
62		SND_DMAENGINE_PCM_FLAG_COMPAT);
63}
64EXPORT_SYMBOL_GPL(imx_pcm_dma_init);
65
66MODULE_LICENSE("GPL");
67