1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * edma-pcm.c - eDMA PCM driver using dmaengine for AM3xxx, AM4xxx
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2014 Texas Instruments, Inc.
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
8*4882a593Smuzhiyun *
9*4882a593Smuzhiyun * Based on: sound/soc/tegra/tegra_pcm.c
10*4882a593Smuzhiyun */
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun #include <linux/module.h>
13*4882a593Smuzhiyun #include <sound/core.h>
14*4882a593Smuzhiyun #include <sound/pcm.h>
15*4882a593Smuzhiyun #include <sound/pcm_params.h>
16*4882a593Smuzhiyun #include <sound/soc.h>
17*4882a593Smuzhiyun #include <sound/dmaengine_pcm.h>
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun #include "edma-pcm.h"
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun static const struct snd_pcm_hardware edma_pcm_hardware = {
22*4882a593Smuzhiyun .info = SNDRV_PCM_INFO_MMAP |
23*4882a593Smuzhiyun SNDRV_PCM_INFO_MMAP_VALID |
24*4882a593Smuzhiyun SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME |
25*4882a593Smuzhiyun SNDRV_PCM_INFO_NO_PERIOD_WAKEUP |
26*4882a593Smuzhiyun SNDRV_PCM_INFO_INTERLEAVED,
27*4882a593Smuzhiyun .buffer_bytes_max = 128 * 1024,
28*4882a593Smuzhiyun .period_bytes_min = 32,
29*4882a593Smuzhiyun .period_bytes_max = 64 * 1024,
30*4882a593Smuzhiyun .periods_min = 2,
31*4882a593Smuzhiyun .periods_max = 19, /* Limit by edma dmaengine driver */
32*4882a593Smuzhiyun };
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun static const struct snd_dmaengine_pcm_config edma_dmaengine_pcm_config = {
35*4882a593Smuzhiyun .pcm_hardware = &edma_pcm_hardware,
36*4882a593Smuzhiyun .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
37*4882a593Smuzhiyun .prealloc_buffer_size = 128 * 1024,
38*4882a593Smuzhiyun };
39*4882a593Smuzhiyun
edma_pcm_platform_register(struct device * dev)40*4882a593Smuzhiyun int edma_pcm_platform_register(struct device *dev)
41*4882a593Smuzhiyun {
42*4882a593Smuzhiyun struct snd_dmaengine_pcm_config *config;
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun if (dev->of_node)
45*4882a593Smuzhiyun return devm_snd_dmaengine_pcm_register(dev,
46*4882a593Smuzhiyun &edma_dmaengine_pcm_config, 0);
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun config = devm_kzalloc(dev, sizeof(*config), GFP_KERNEL);
49*4882a593Smuzhiyun if (!config)
50*4882a593Smuzhiyun return -ENOMEM;
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun *config = edma_dmaengine_pcm_config;
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun config->chan_names[0] = "tx";
55*4882a593Smuzhiyun config->chan_names[1] = "rx";
56*4882a593Smuzhiyun
57*4882a593Smuzhiyun return devm_snd_dmaengine_pcm_register(dev, config, 0);
58*4882a593Smuzhiyun }
59*4882a593Smuzhiyun EXPORT_SYMBOL_GPL(edma_pcm_platform_register);
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
62*4882a593Smuzhiyun MODULE_DESCRIPTION("eDMA PCM ASoC platform driver");
63*4882a593Smuzhiyun MODULE_LICENSE("GPL");
64