2 * edma-pcm.c - eDMA PCM driver using dmaengine for AM3xxx, AM4xxx
4 * Copyright (C) 2014 Texas Instruments, Inc.
6 * Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
8 * Based on: sound/soc/tegra/tegra_pcm.c
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * version 2 as published by the Free Software Foundation.
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
20 #include <linux/module.h>
21 #include <sound/core.h>
22 #include <sound/pcm.h>
23 #include <sound/pcm_params.h>
24 #include <sound/soc.h>
25 #include <sound/dmaengine_pcm.h>
29 static const struct snd_pcm_hardware edma_pcm_hardware = {
30 .info = SNDRV_PCM_INFO_MMAP |
31 SNDRV_PCM_INFO_MMAP_VALID |
32 SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME |
33 SNDRV_PCM_INFO_NO_PERIOD_WAKEUP |
34 SNDRV_PCM_INFO_INTERLEAVED,
35 .buffer_bytes_max = 128 * 1024,
36 .period_bytes_min = 32,
37 .period_bytes_max = 64 * 1024,
39 .periods_max = 19, /* Limit by edma dmaengine driver */
42 static const struct snd_dmaengine_pcm_config edma_dmaengine_pcm_config = {
43 .pcm_hardware = &edma_pcm_hardware,
44 .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
45 .prealloc_buffer_size = 128 * 1024,
48 int edma_pcm_platform_register(struct device *dev)
50 return devm_snd_dmaengine_pcm_register(dev, &edma_dmaengine_pcm_config, 0);
52 EXPORT_SYMBOL_GPL(edma_pcm_platform_register);
54 MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
55 MODULE_DESCRIPTION("eDMA PCM ASoC platform driver");
56 MODULE_LICENSE("GPL");