tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * ALSA PCM interface for ST SPEAr Processors
4 *
5 * sound/soc/spear/spear_pcm.c
6 *
7 * Copyright (C) 2012 ST Microelectronics
8 * Rajeev Kumar<rajeevkumar.linux@gmail.com>
9 */
10
11#include <linux/module.h>
12#include <linux/dmaengine.h>
13#include <linux/platform_device.h>
14#include <sound/dmaengine_pcm.h>
15#include <sound/pcm.h>
16#include <sound/soc.h>
17#include <sound/spear_dma.h>
18#include "spear_pcm.h"
19
20static const struct snd_pcm_hardware spear_pcm_hardware = {
21 .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
22 SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
23 SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME),
24 .buffer_bytes_max = 16 * 1024, /* max buffer size */
25 .period_bytes_min = 2 * 1024, /* 1 msec data minimum period size */
26 .period_bytes_max = 2 * 1024, /* maximum period size */
27 .periods_min = 1, /* min # periods */
28 .periods_max = 8, /* max # of periods */
29 .fifo_size = 0, /* fifo size in bytes */
30};
31
32static const struct snd_dmaengine_pcm_config spear_dmaengine_pcm_config = {
33 .pcm_hardware = &spear_pcm_hardware,
34 .prealloc_buffer_size = 16 * 1024,
35};
36
37int devm_spear_pcm_platform_register(struct device *dev,
38 struct snd_dmaengine_pcm_config *config,
39 bool (*filter)(struct dma_chan *chan, void *slave))
40{
41 *config = spear_dmaengine_pcm_config;
42 config->compat_filter_fn = filter;
43
44 return devm_snd_dmaengine_pcm_register(dev, config,
45 SND_DMAENGINE_PCM_FLAG_NO_DT |
46 SND_DMAENGINE_PCM_FLAG_COMPAT);
47}
48EXPORT_SYMBOL_GPL(devm_spear_pcm_platform_register);
49
50MODULE_AUTHOR("Rajeev Kumar <rajeevkumar.linux@gmail.com>");
51MODULE_DESCRIPTION("SPEAr PCM DMA module");
52MODULE_LICENSE("GPL");