1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * edma-pcm.c - eDMA PCM driver using dmaengine for AM3xxx, AM4xxx
4 *
5 * Copyright (C) 2014 Texas Instruments, Inc.
6 *
7 * Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
8 *
9 * Based on: sound/soc/tegra/tegra_pcm.c
10 */
11
12#include <linux/module.h>
13#include <sound/core.h>
14#include <sound/pcm.h>
15#include <sound/pcm_params.h>
16#include <sound/soc.h>
17#include <sound/dmaengine_pcm.h>
18
19#include "edma-pcm.h"
20
21static const struct snd_pcm_hardware edma_pcm_hardware = {
22	.info			= SNDRV_PCM_INFO_MMAP |
23				  SNDRV_PCM_INFO_MMAP_VALID |
24				  SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME |
25				  SNDRV_PCM_INFO_NO_PERIOD_WAKEUP |
26				  SNDRV_PCM_INFO_INTERLEAVED,
27	.buffer_bytes_max	= 128 * 1024,
28	.period_bytes_min	= 32,
29	.period_bytes_max	= 64 * 1024,
30	.periods_min		= 2,
31	.periods_max		= 19, /* Limit by edma dmaengine driver */
32};
33
34static const struct snd_dmaengine_pcm_config edma_dmaengine_pcm_config = {
35	.pcm_hardware = &edma_pcm_hardware,
36	.prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
37	.prealloc_buffer_size = 128 * 1024,
38};
39
40int edma_pcm_platform_register(struct device *dev)
41{
42	struct snd_dmaengine_pcm_config *config;
43
44	if (dev->of_node)
45		return devm_snd_dmaengine_pcm_register(dev,
46						&edma_dmaengine_pcm_config, 0);
47
48	config = devm_kzalloc(dev, sizeof(*config), GFP_KERNEL);
49	if (!config)
50		return -ENOMEM;
51
52	*config = edma_dmaengine_pcm_config;
53
54	config->chan_names[0] = "tx";
55	config->chan_names[1] = "rx";
56
57	return devm_snd_dmaengine_pcm_register(dev, config, 0);
58}
59EXPORT_SYMBOL_GPL(edma_pcm_platform_register);
60
61MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
62MODULE_DESCRIPTION("eDMA PCM ASoC platform driver");
63MODULE_LICENSE("GPL");
64