1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/sound/arm/ep93xx-pcm.c - EP93xx ALSA PCM interface
4 *
5 * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
6 * Copyright (C) 2006 Applied Data Systems
7 *
8 * Rewritten for the SoC audio subsystem (Based on PXA2xx code):
9 * Copyright (c) 2008 Ryan Mallon
10 */
11
12#include <linux/module.h>
13#include <linux/init.h>
14#include <linux/platform_device.h>
15#include <linux/dmaengine.h>
16
17#include <sound/pcm.h>
18#include <sound/soc.h>
19#include <sound/dmaengine_pcm.h>
20
21#include <linux/platform_data/dma-ep93xx.h>
22
23#include "ep93xx-pcm.h"
24
25static const struct snd_pcm_hardware ep93xx_pcm_hardware = {
26 .info = (SNDRV_PCM_INFO_MMAP |
27 SNDRV_PCM_INFO_MMAP_VALID |
28 SNDRV_PCM_INFO_INTERLEAVED |
29 SNDRV_PCM_INFO_BLOCK_TRANSFER),
30 .buffer_bytes_max = 131072,
31 .period_bytes_min = 32,
32 .period_bytes_max = 32768,
33 .periods_min = 1,
34 .periods_max = 32,
35 .fifo_size = 32,
36};
37
38static bool ep93xx_pcm_dma_filter(struct dma_chan *chan, void *filter_param)
39{
40 struct ep93xx_dma_data *data = filter_param;
41
42 if (data->direction == ep93xx_dma_chan_direction(chan)) {
43 chan->private = data;
44 return true;
45 }
46
47 return false;
48}
49
50static const struct snd_dmaengine_pcm_config ep93xx_dmaengine_pcm_config = {
51 .pcm_hardware = &ep93xx_pcm_hardware,
52 .compat_filter_fn = ep93xx_pcm_dma_filter,
53 .prealloc_buffer_size = 131072,
54};
55
56int devm_ep93xx_pcm_platform_register(struct device *dev)
57{
58 return devm_snd_dmaengine_pcm_register(dev,
59 config: &ep93xx_dmaengine_pcm_config,
60 SND_DMAENGINE_PCM_FLAG_NO_DT |
61 SND_DMAENGINE_PCM_FLAG_COMPAT);
62}
63EXPORT_SYMBOL_GPL(devm_ep93xx_pcm_platform_register);
64
65MODULE_AUTHOR("Ryan Mallon");
66MODULE_DESCRIPTION("EP93xx ALSA PCM interface");
67MODULE_LICENSE("GPL");
68

source code of linux/sound/soc/cirrus/ep93xx-pcm.c