1// SPDX-License-Identifier: GPL-2.0
2/*
3 *  Copyright (C) 2018 Texas Instruments Incorporated - https://www.ti.com
4 *  Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
5 */
6
7#include <linux/device.h>
8#include <linux/module.h>
9#include <sound/core.h>
10#include <sound/pcm.h>
11#include <sound/pcm_params.h>
12#include <sound/soc.h>
13#include <sound/dmaengine_pcm.h>
14
15#include "sdma-pcm.h"
16
17static const struct snd_pcm_hardware sdma_pcm_hardware = {
18	.info			= SNDRV_PCM_INFO_MMAP |
19				  SNDRV_PCM_INFO_MMAP_VALID |
20				  SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME |
21				  SNDRV_PCM_INFO_NO_PERIOD_WAKEUP |
22				  SNDRV_PCM_INFO_INTERLEAVED,
23	.period_bytes_min	= 32,
24	.period_bytes_max	= 64 * 1024,
25	.buffer_bytes_max	= 128 * 1024,
26	.periods_min		= 2,
27	.periods_max		= 255,
28};
29
30static const struct snd_dmaengine_pcm_config sdma_dmaengine_pcm_config = {
31	.pcm_hardware = &sdma_pcm_hardware,
32	.prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
33	.prealloc_buffer_size = 128 * 1024,
34};
35
36int sdma_pcm_platform_register(struct device *dev,
37			       char *txdmachan, char *rxdmachan)
38{
39	struct snd_dmaengine_pcm_config *config;
40	unsigned int flags = 0;
41
42	/* Standard names for the directions: 'tx' and 'rx' */
43	if (!txdmachan && !rxdmachan)
44		return devm_snd_dmaengine_pcm_register(dev,
45						&sdma_dmaengine_pcm_config, 0);
46
47	config = devm_kzalloc(dev, sizeof(*config), GFP_KERNEL);
48	if (!config)
49		return -ENOMEM;
50
51	*config = sdma_dmaengine_pcm_config;
52
53	if (!txdmachan || !rxdmachan) {
54		/* One direction only PCM */
55		flags |= SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX;
56		if (!txdmachan) {
57			txdmachan = rxdmachan;
58			rxdmachan = NULL;
59		}
60	}
61
62	config->chan_names[0] = txdmachan;
63	config->chan_names[1] = rxdmachan;
64
65	return devm_snd_dmaengine_pcm_register(dev, config, flags);
66}
67EXPORT_SYMBOL_GPL(sdma_pcm_platform_register);
68
69MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
70MODULE_DESCRIPTION("sDMA PCM ASoC platform driver");
71MODULE_LICENSE("GPL v2");
72