1 /*
2 * ALSA PCM interface for ST SPEAr Processors
3 *
4 * sound/soc/spear/spear_pcm.c
5 *
6 * Copyright (C) 2012 ST Microelectronics
7 * Rajeev Kumar<rajeevkumar.linux@gmail.com>
8 *
9 * This file is licensed under the terms of the GNU General Public
10 * License version 2. This program is licensed "as is" without any
11 * warranty of any kind, whether express or implied.
12 */
13
14 #include <linux/module.h>
15 #include <linux/dmaengine.h>
16 #include <linux/platform_device.h>
17 #include <sound/dmaengine_pcm.h>
18 #include <sound/pcm.h>
19 #include <sound/soc.h>
20 #include <sound/spear_dma.h>
21 #include "spear_pcm.h"
22
23 static const struct snd_pcm_hardware spear_pcm_hardware = {
24 .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
25 SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
26 SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME),
27 .buffer_bytes_max = 16 * 1024, /* max buffer size */
28 .period_bytes_min = 2 * 1024, /* 1 msec data minimum period size */
29 .period_bytes_max = 2 * 1024, /* maximum period size */
30 .periods_min = 1, /* min # periods */
31 .periods_max = 8, /* max # of periods */
32 .fifo_size = 0, /* fifo size in bytes */
33 };
34
35 static const struct snd_dmaengine_pcm_config spear_dmaengine_pcm_config = {
36 .pcm_hardware = &spear_pcm_hardware,
37 .prealloc_buffer_size = 16 * 1024,
38 };
39
40 int devm_spear_pcm_platform_register(struct device *dev,
41 struct snd_dmaengine_pcm_config *config,
42 bool (*filter)(struct dma_chan *chan, void *slave))
43 {
44 *config = spear_dmaengine_pcm_config;
45 config->compat_filter_fn = filter;
46
47 return devm_snd_dmaengine_pcm_register(dev, config,
48 SND_DMAENGINE_PCM_FLAG_NO_DT |
49 SND_DMAENGINE_PCM_FLAG_COMPAT);
50 }
51 EXPORT_SYMBOL_GPL(devm_spear_pcm_platform_register);
52
53 MODULE_AUTHOR("Rajeev Kumar <rajeevkumar.linux@gmail.com>");
54 MODULE_DESCRIPTION("SPEAr PCM DMA module");
55 MODULE_LICENSE("GPL");
56
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