1/*
 2 * edma-pcm.c - eDMA PCM driver using dmaengine for AM3xxx, AM4xxx
 3 *
 4 * Copyright (C) 2014 Texas Instruments, Inc.
 5 *
 6 * Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
 7 *
 8 * Based on: sound/soc/tegra/tegra_pcm.c
 9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * version 2 as published by the Free Software Foundation.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17 * General Public License for more details.
18 */
19
20#include <linux/module.h>
21#include <sound/core.h>
22#include <sound/pcm.h>
23#include <sound/pcm_params.h>
24#include <sound/soc.h>
25#include <sound/dmaengine_pcm.h>
26#include <linux/edma.h>
27
28static const struct snd_pcm_hardware edma_pcm_hardware = {
29	.info			= SNDRV_PCM_INFO_MMAP |
30				  SNDRV_PCM_INFO_MMAP_VALID |
31				  SNDRV_PCM_INFO_BATCH |
32				  SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME |
33				  SNDRV_PCM_INFO_INTERLEAVED,
34	.buffer_bytes_max	= 128 * 1024,
35	.period_bytes_min	= 32,
36	.period_bytes_max	= 64 * 1024,
37	.periods_min		= 2,
38	.periods_max		= 19, /* Limit by edma dmaengine driver */
39};
40
41static const struct snd_dmaengine_pcm_config edma_dmaengine_pcm_config = {
42	.pcm_hardware = &edma_pcm_hardware,
43	.prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
44	.compat_filter_fn = edma_filter_fn,
45	.prealloc_buffer_size = 128 * 1024,
46};
47
48int edma_pcm_platform_register(struct device *dev)
49{
50	return devm_snd_dmaengine_pcm_register(dev, &edma_dmaengine_pcm_config,
51					SND_DMAENGINE_PCM_FLAG_COMPAT);
52}
53EXPORT_SYMBOL_GPL(edma_pcm_platform_register);
54
55MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
56MODULE_DESCRIPTION("eDMA PCM ASoC platform driver");
57MODULE_LICENSE("GPL");