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
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
|
/*
* imx-pcm-dma-mx2.c -- ALSA Soc Audio Layer
*
* Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
*
* This code is based on code copyrighted by Freescale,
* Liam Girdwood, Javier Martin and probably others.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/dmaengine.h>
#include <linux/types.h>
#include <linux/platform_data/dma-imx.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/soc.h>
#include <sound/dmaengine_pcm.h>
#include "imx-pcm.h"
static bool filter(struct dma_chan *chan, void *param)
{
struct snd_dmaengine_dai_dma_data *dma_data = param;
if (!imx_dma_is_general_purpose(chan))
return false;
chan->private = dma_data->filter_data;
return true;
}
static const struct snd_pcm_hardware imx_pcm_hardware = {
.info = SNDRV_PCM_INFO_INTERLEAVED |
SNDRV_PCM_INFO_BLOCK_TRANSFER |
SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_MMAP_VALID |
SNDRV_PCM_INFO_PAUSE |
SNDRV_PCM_INFO_RESUME,
.formats = SNDRV_PCM_FMTBIT_S16_LE |
SNDRV_PCM_FMTBIT_S24_LE |
SNDRV_PCM_FMTBIT_S20_3LE,
.rate_min = 8000,
.channels_min = 2,
.channels_max = 2,
.buffer_bytes_max = IMX_DEFAULT_DMABUF_SIZE,
.period_bytes_min = 128,
.period_bytes_max = 65535, /* Limited by SDMA engine */
.periods_min = 2,
.periods_max = 255,
.fifo_size = 0,
};
static void imx_pcm_dma_set_config_from_dai_data(
const struct snd_pcm_substream *substream,
const struct snd_dmaengine_dai_dma_data *dma_data,
struct dma_slave_config *slave_config)
{
struct imx_dma_data *filter_data = dma_data->filter_data;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
slave_config->dst_addr = dma_data->addr;
slave_config->dst_maxburst = dma_data->maxburst;
if (dma_data->addr_width != DMA_SLAVE_BUSWIDTH_UNDEFINED)
slave_config->dst_addr_width = dma_data->addr_width;
} else {
slave_config->src_addr = dma_data->addr;
slave_config->src_maxburst = dma_data->maxburst;
if (dma_data->addr_width != DMA_SLAVE_BUSWIDTH_UNDEFINED)
slave_config->src_addr_width = dma_data->addr_width;
}
slave_config->slave_id = dma_data->slave_id;
/*
* In dma binding mode, there is no filter_data, so dma_request need to be
* set to zero.
*/
if (filter_data) {
slave_config->dma_request0 = filter_data->dma_request0;
slave_config->dma_request1 = filter_data->dma_request1;
} else {
slave_config->dma_request0 = 0;
slave_config->dma_request1 = 0;
}
}
static void imx_pcm_dma_complete(void *arg)
{
struct snd_pcm_substream *substream = arg;
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct dmaengine_pcm_runtime_data *prtd = substream->runtime->private_data;
struct snd_dmaengine_dai_dma_data *dma_data;
prtd->pos += snd_pcm_lib_period_bytes(substream);
if (prtd->pos >= snd_pcm_lib_buffer_bytes(substream))
prtd->pos = 0;
snd_pcm_period_elapsed(substream);
dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
if (dma_data->check_xrun && dma_data->check_xrun(substream))
dma_data->device_reset(substream, 1);
}
static int imx_pcm_dma_prepare_slave_config(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params, struct dma_slave_config *slave_config)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_dmaengine_dai_dma_data *dma_data;
struct dmaengine_pcm_runtime_data *prtd = substream->runtime->private_data;
int ret;
dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
prtd->callback = imx_pcm_dma_complete;
ret = snd_hwparams_to_dma_slave_config(substream, params, slave_config);
if (ret)
return ret;
imx_pcm_dma_set_config_from_dai_data(substream, dma_data,
slave_config);
return 0;
}
static const struct snd_dmaengine_pcm_config imx_dmaengine_pcm_config = {
.pcm_hardware = &imx_pcm_hardware,
.prepare_slave_config = imx_pcm_dma_prepare_slave_config,
.compat_filter_fn = filter,
.prealloc_buffer_size = IMX_DEFAULT_DMABUF_SIZE,
};
int imx_pcm_dma_init(struct platform_device *pdev, unsigned int flags, size_t size)
{
struct snd_dmaengine_pcm_config *config;
struct snd_pcm_hardware *pcm_hardware;
config = devm_kzalloc(&pdev->dev,
sizeof(struct snd_dmaengine_pcm_config), GFP_KERNEL);
*config = imx_dmaengine_pcm_config;
if (size)
config->prealloc_buffer_size = size;
pcm_hardware = devm_kzalloc(&pdev->dev,
sizeof(struct snd_pcm_hardware), GFP_KERNEL);
*pcm_hardware = imx_pcm_hardware;
if (size)
pcm_hardware->buffer_bytes_max = size;
config->pcm_hardware = pcm_hardware;
return snd_dmaengine_pcm_register(&pdev->dev, config, flags);
}
EXPORT_SYMBOL_GPL(imx_pcm_dma_init);
void imx_pcm_dma_exit(struct platform_device *pdev)
{
snd_dmaengine_pcm_unregister(&pdev->dev);
}
EXPORT_SYMBOL_GPL(imx_pcm_dma_exit);
|
