1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright (C) 2018 Texas Instruments Incorporated - https://www.ti.com
4*4882a593Smuzhiyun * Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
5*4882a593Smuzhiyun */
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun #include <linux/device.h>
8*4882a593Smuzhiyun #include <linux/module.h>
9*4882a593Smuzhiyun #include <sound/core.h>
10*4882a593Smuzhiyun #include <sound/pcm.h>
11*4882a593Smuzhiyun #include <sound/pcm_params.h>
12*4882a593Smuzhiyun #include <sound/soc.h>
13*4882a593Smuzhiyun #include <sound/dmaengine_pcm.h>
14*4882a593Smuzhiyun
15*4882a593Smuzhiyun #include "sdma-pcm.h"
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun static const struct snd_pcm_hardware sdma_pcm_hardware = {
18*4882a593Smuzhiyun .info = SNDRV_PCM_INFO_MMAP |
19*4882a593Smuzhiyun SNDRV_PCM_INFO_MMAP_VALID |
20*4882a593Smuzhiyun SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME |
21*4882a593Smuzhiyun SNDRV_PCM_INFO_NO_PERIOD_WAKEUP |
22*4882a593Smuzhiyun SNDRV_PCM_INFO_INTERLEAVED,
23*4882a593Smuzhiyun .period_bytes_min = 32,
24*4882a593Smuzhiyun .period_bytes_max = 64 * 1024,
25*4882a593Smuzhiyun .buffer_bytes_max = 128 * 1024,
26*4882a593Smuzhiyun .periods_min = 2,
27*4882a593Smuzhiyun .periods_max = 255,
28*4882a593Smuzhiyun };
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun static const struct snd_dmaengine_pcm_config sdma_dmaengine_pcm_config = {
31*4882a593Smuzhiyun .pcm_hardware = &sdma_pcm_hardware,
32*4882a593Smuzhiyun .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
33*4882a593Smuzhiyun .prealloc_buffer_size = 128 * 1024,
34*4882a593Smuzhiyun };
35*4882a593Smuzhiyun
sdma_pcm_platform_register(struct device * dev,char * txdmachan,char * rxdmachan)36*4882a593Smuzhiyun int sdma_pcm_platform_register(struct device *dev,
37*4882a593Smuzhiyun char *txdmachan, char *rxdmachan)
38*4882a593Smuzhiyun {
39*4882a593Smuzhiyun struct snd_dmaengine_pcm_config *config;
40*4882a593Smuzhiyun unsigned int flags = 0;
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun /* Standard names for the directions: 'tx' and 'rx' */
43*4882a593Smuzhiyun if (!txdmachan && !rxdmachan)
44*4882a593Smuzhiyun return devm_snd_dmaengine_pcm_register(dev,
45*4882a593Smuzhiyun &sdma_dmaengine_pcm_config, 0);
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun config = devm_kzalloc(dev, sizeof(*config), GFP_KERNEL);
48*4882a593Smuzhiyun if (!config)
49*4882a593Smuzhiyun return -ENOMEM;
50*4882a593Smuzhiyun
51*4882a593Smuzhiyun *config = sdma_dmaengine_pcm_config;
52*4882a593Smuzhiyun
53*4882a593Smuzhiyun if (!txdmachan || !rxdmachan) {
54*4882a593Smuzhiyun /* One direction only PCM */
55*4882a593Smuzhiyun flags |= SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX;
56*4882a593Smuzhiyun if (!txdmachan) {
57*4882a593Smuzhiyun txdmachan = rxdmachan;
58*4882a593Smuzhiyun rxdmachan = NULL;
59*4882a593Smuzhiyun }
60*4882a593Smuzhiyun }
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun config->chan_names[0] = txdmachan;
63*4882a593Smuzhiyun config->chan_names[1] = rxdmachan;
64*4882a593Smuzhiyun
65*4882a593Smuzhiyun return devm_snd_dmaengine_pcm_register(dev, config, flags);
66*4882a593Smuzhiyun }
67*4882a593Smuzhiyun EXPORT_SYMBOL_GPL(sdma_pcm_platform_register);
68*4882a593Smuzhiyun
69*4882a593Smuzhiyun MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
70*4882a593Smuzhiyun MODULE_DESCRIPTION("sDMA PCM ASoC platform driver");
71*4882a593Smuzhiyun MODULE_LICENSE("GPL v2");
72