1 /*
2 * tegra_pcm.c - Tegra PCM driver
3 *
4 * Author: Stephen Warren <swarren@nvidia.com>
5 * Copyright (C) 2010,2012 - NVIDIA, Inc.
6 *
7 * Based on code copyright/by:
8 *
9 * Copyright (c) 2009-2010, NVIDIA Corporation.
10 * Scott Peterson <speterson@nvidia.com>
11 * Vijay Mali <vmali@nvidia.com>
12 *
13 * Copyright (C) 2010 Google, Inc.
14 * Iliyan Malchev <malchev@google.com>
15 *
16 * This program is free software; you can redistribute it and/or
17 * modify it under the terms of the GNU General Public License
18 * version 2 as published by the Free Software Foundation.
19 *
20 * This program is distributed in the hope that it will be useful, but
21 * WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23 * General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
28 * 02110-1301 USA
29 *
30 */
31
32 #include <linux/module.h>
33 #include <sound/core.h>
34 #include <sound/pcm.h>
35 #include <sound/pcm_params.h>
36 #include <sound/soc.h>
37 #include <sound/dmaengine_pcm.h>
38
39 #include "tegra_pcm.h"
40
41 static const struct snd_pcm_hardware tegra_pcm_hardware = {
42 .info = SNDRV_PCM_INFO_MMAP |
43 SNDRV_PCM_INFO_MMAP_VALID |
44 SNDRV_PCM_INFO_INTERLEAVED,
45 .period_bytes_min = 1024,
46 .period_bytes_max = PAGE_SIZE,
47 .periods_min = 2,
48 .periods_max = 8,
49 .buffer_bytes_max = PAGE_SIZE * 8,
50 .fifo_size = 4,
51 };
52
53 static const struct snd_dmaengine_pcm_config tegra_dmaengine_pcm_config = {
54 .pcm_hardware = &tegra_pcm_hardware,
55 .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
56 .prealloc_buffer_size = PAGE_SIZE * 8,
57 };
58
tegra_pcm_platform_register(struct device * dev)59 int tegra_pcm_platform_register(struct device *dev)
60 {
61 return snd_dmaengine_pcm_register(dev, &tegra_dmaengine_pcm_config, 0);
62 }
63 EXPORT_SYMBOL_GPL(tegra_pcm_platform_register);
64
tegra_pcm_platform_register_with_chan_names(struct device * dev,struct snd_dmaengine_pcm_config * config,char * txdmachan,char * rxdmachan)65 int tegra_pcm_platform_register_with_chan_names(struct device *dev,
66 struct snd_dmaengine_pcm_config *config,
67 char *txdmachan, char *rxdmachan)
68 {
69 *config = tegra_dmaengine_pcm_config;
70 config->dma_dev = dev->parent;
71 config->chan_names[0] = txdmachan;
72 config->chan_names[1] = rxdmachan;
73
74 return snd_dmaengine_pcm_register(dev, config, 0);
75 }
76 EXPORT_SYMBOL_GPL(tegra_pcm_platform_register_with_chan_names);
77
tegra_pcm_platform_unregister(struct device * dev)78 void tegra_pcm_platform_unregister(struct device *dev)
79 {
80 return snd_dmaengine_pcm_unregister(dev);
81 }
82 EXPORT_SYMBOL_GPL(tegra_pcm_platform_unregister);
83
84 MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
85 MODULE_DESCRIPTION("Tegra PCM ASoC driver");
86 MODULE_LICENSE("GPL");
87