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