xref: /openbmc/linux/sound/soc/tegra/tegra_pcm.c (revision 22d55f02)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * tegra_pcm.c - Tegra PCM driver
4  *
5  * Author: Stephen Warren <swarren@nvidia.com>
6  * Copyright (C) 2010,2012 - NVIDIA, Inc.
7  *
8  * Based on code copyright/by:
9  *
10  * Copyright (c) 2009-2010, NVIDIA Corporation.
11  * Scott Peterson <speterson@nvidia.com>
12  * Vijay Mali <vmali@nvidia.com>
13  *
14  * Copyright (C) 2010 Google, Inc.
15  * Iliyan Malchev <malchev@google.com>
16  */
17 
18 #include <linux/module.h>
19 #include <sound/core.h>
20 #include <sound/pcm.h>
21 #include <sound/pcm_params.h>
22 #include <sound/soc.h>
23 #include <sound/dmaengine_pcm.h>
24 
25 #include "tegra_pcm.h"
26 
27 static const struct snd_pcm_hardware tegra_pcm_hardware = {
28 	.info			= SNDRV_PCM_INFO_MMAP |
29 				  SNDRV_PCM_INFO_MMAP_VALID |
30 				  SNDRV_PCM_INFO_INTERLEAVED,
31 	.period_bytes_min	= 1024,
32 	.period_bytes_max	= PAGE_SIZE,
33 	.periods_min		= 2,
34 	.periods_max		= 8,
35 	.buffer_bytes_max	= PAGE_SIZE * 8,
36 	.fifo_size		= 4,
37 };
38 
39 static const struct snd_dmaengine_pcm_config tegra_dmaengine_pcm_config = {
40 	.pcm_hardware = &tegra_pcm_hardware,
41 	.prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
42 	.prealloc_buffer_size = PAGE_SIZE * 8,
43 };
44 
45 int tegra_pcm_platform_register(struct device *dev)
46 {
47 	return snd_dmaengine_pcm_register(dev, &tegra_dmaengine_pcm_config, 0);
48 }
49 EXPORT_SYMBOL_GPL(tegra_pcm_platform_register);
50 
51 int tegra_pcm_platform_register_with_chan_names(struct device *dev,
52 				struct snd_dmaengine_pcm_config *config,
53 				char *txdmachan, char *rxdmachan)
54 {
55 	*config = tegra_dmaengine_pcm_config;
56 	config->dma_dev = dev->parent;
57 	config->chan_names[0] = txdmachan;
58 	config->chan_names[1] = rxdmachan;
59 
60 	return snd_dmaengine_pcm_register(dev, config, 0);
61 }
62 EXPORT_SYMBOL_GPL(tegra_pcm_platform_register_with_chan_names);
63 
64 void tegra_pcm_platform_unregister(struct device *dev)
65 {
66 	return snd_dmaengine_pcm_unregister(dev);
67 }
68 EXPORT_SYMBOL_GPL(tegra_pcm_platform_unregister);
69 
70 MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
71 MODULE_DESCRIPTION("Tegra PCM ASoC driver");
72 MODULE_LICENSE("GPL");
73