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
25 static 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
ep93xx_pcm_dma_filter(struct dma_chan * chan,void * filter_param)38 static 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
50 static 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
devm_ep93xx_pcm_platform_register(struct device * dev)56 int devm_ep93xx_pcm_platform_register(struct device *dev)
57 {
58 return devm_snd_dmaengine_pcm_register(dev,
59 &ep93xx_dmaengine_pcm_config,
60 SND_DMAENGINE_PCM_FLAG_NO_DT |
61 SND_DMAENGINE_PCM_FLAG_COMPAT);
62 }
63 EXPORT_SYMBOL_GPL(devm_ep93xx_pcm_platform_register);
64
65 MODULE_AUTHOR("Ryan Mallon");
66 MODULE_DESCRIPTION("EP93xx ALSA PCM interface");
67 MODULE_LICENSE("GPL");
68