1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
4 *
5 * Based on sound/soc/imx/imx-pcm-dma-mx2.c
6 */
7
8#include <linux/device.h>
9#include <linux/init.h>
10#include <linux/module.h>
11
12#include <sound/core.h>
13#include <sound/pcm.h>
14#include <sound/soc.h>
15#include <sound/dmaengine_pcm.h>
16
17#include "mxs-pcm.h"
18
19static const struct snd_pcm_hardware snd_mxs_hardware = {
20 .info = SNDRV_PCM_INFO_MMAP |
21 SNDRV_PCM_INFO_MMAP_VALID |
22 SNDRV_PCM_INFO_PAUSE |
23 SNDRV_PCM_INFO_RESUME |
24 SNDRV_PCM_INFO_INTERLEAVED |
25 SNDRV_PCM_INFO_HALF_DUPLEX,
26 .period_bytes_min = 32,
27 .period_bytes_max = 8192,
28 .periods_min = 1,
29 .periods_max = 52,
30 .buffer_bytes_max = 64 * 1024,
31 .fifo_size = 32,
32};
33
34static const struct snd_dmaengine_pcm_config mxs_dmaengine_pcm_config = {
35 .pcm_hardware = &snd_mxs_hardware,
36 .prealloc_buffer_size = 64 * 1024,
37};
38
39int mxs_pcm_platform_register(struct device *dev)
40{
41 return devm_snd_dmaengine_pcm_register(dev, config: &mxs_dmaengine_pcm_config,
42 SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX);
43}
44EXPORT_SYMBOL_GPL(mxs_pcm_platform_register);
45
46MODULE_LICENSE("GPL");
47

source code of linux/sound/soc/mxs/mxs-pcm.c