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
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
|
/*
* ALSA PCM interface for ST SPEAr Processors
*
* sound/soc/spear/spear_pcm.c
*
* Copyright (C) 2012 ST Microelectronics
* Rajeev Kumar<rajeev-dlh.kumar@st.com>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/module.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/scatterlist.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/dmaengine_pcm.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/spear_dma.h>
struct snd_pcm_hardware spear_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),
.buffer_bytes_max = 16 * 1024, /* max buffer size */
.period_bytes_min = 2 * 1024, /* 1 msec data minimum period size */
.period_bytes_max = 2 * 1024, /* maximum period size */
.periods_min = 1, /* min # periods */
.periods_max = 8, /* max # of periods */
.fifo_size = 0, /* fifo size in bytes */
};
static int spear_pcm_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
return 0;
}
static int spear_pcm_hw_free(struct snd_pcm_substream *substream)
{
snd_pcm_set_runtime_buffer(substream, NULL);
return 0;
}
static int spear_pcm_open(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct spear_dma_data *dma_data = (struct spear_dma_data *)
snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
int ret;
ret = snd_soc_set_runtime_hwparams(substream, &spear_pcm_hardware);
if (ret)
return ret;
ret = snd_dmaengine_pcm_open(substream, dma_data->filter, dma_data);
if (ret)
return ret;
snd_dmaengine_pcm_set_data(substream, dma_data);
return 0;
}
static int spear_pcm_close(struct snd_pcm_substream *substream)
{
snd_dmaengine_pcm_close(substream);
return 0;
}
static int spear_pcm_mmap(struct snd_pcm_substream *substream,
struct vm_area_struct *vma)
{
struct snd_pcm_runtime *runtime = substream->runtime;
return dma_mmap_writecombine(substream->pcm->card->dev, vma,
runtime->dma_area, runtime->dma_addr,
runtime->dma_bytes);
}
static struct snd_pcm_ops spear_pcm_ops = {
.open = spear_pcm_open,
.close = spear_pcm_close,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = spear_pcm_hw_params,
.hw_free = spear_pcm_hw_free,
.trigger = snd_dmaengine_pcm_trigger,
.pointer = snd_dmaengine_pcm_pointer,
.mmap = spear_pcm_mmap,
};
static int
spear_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream,
size_t size)
{
struct snd_pcm_substream *substream = pcm->streams[stream].substream;
struct snd_dma_buffer *buf = &substream->dma_buffer;
buf->dev.type = SNDRV_DMA_TYPE_DEV;
buf->dev.dev = pcm->card->dev;
buf->private_data = NULL;
buf->area = dma_alloc_writecombine(pcm->card->dev, size,
&buf->addr, GFP_KERNEL);
if (!buf->area)
return -ENOMEM;
dev_info(buf->dev.dev,
" preallocate_dma_buffer: area=%p, addr=%p, size=%d\n",
(void *)buf->area, (void *)buf->addr, size);
buf->bytes = size;
return 0;
}
static void spear_pcm_free(struct snd_pcm *pcm)
{
struct snd_pcm_substream *substream;
struct snd_dma_buffer *buf;
int stream;
for (stream = 0; stream < 2; stream++) {
substream = pcm->streams[stream].substream;
if (!substream)
continue;
buf = &substream->dma_buffer;
if (!buf || !buf->area)
continue;
dma_free_writecombine(pcm->card->dev, buf->bytes,
buf->area, buf->addr);
buf->area = NULL;
}
}
static u64 spear_pcm_dmamask = DMA_BIT_MASK(32);
static int spear_pcm_new(struct snd_card *card,
struct snd_soc_dai *dai, struct snd_pcm *pcm)
{
int ret;
if (!card->dev->dma_mask)
card->dev->dma_mask = &spear_pcm_dmamask;
if (!card->dev->coherent_dma_mask)
card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
if (dai->driver->playback.channels_min) {
ret = spear_pcm_preallocate_dma_buffer(pcm,
SNDRV_PCM_STREAM_PLAYBACK,
spear_pcm_hardware.buffer_bytes_max);
if (ret)
return ret;
}
if (dai->driver->capture.channels_min) {
ret = spear_pcm_preallocate_dma_buffer(pcm,
SNDRV_PCM_STREAM_CAPTURE,
spear_pcm_hardware.buffer_bytes_max);
if (ret)
return ret;
}
return 0;
}
struct snd_soc_platform_driver spear_soc_platform = {
.ops = &spear_pcm_ops,
.pcm_new = spear_pcm_new,
.pcm_free = spear_pcm_free,
};
static int spear_soc_platform_probe(struct platform_device *pdev)
{
return snd_soc_register_platform(&pdev->dev, &spear_soc_platform);
}
static int spear_soc_platform_remove(struct platform_device *pdev)
{
snd_soc_unregister_platform(&pdev->dev);
return 0;
}
static struct platform_driver spear_pcm_driver = {
.driver = {
.name = "spear-pcm-audio",
.owner = THIS_MODULE,
},
.probe = spear_soc_platform_probe,
.remove = spear_soc_platform_remove,
};
module_platform_driver(spear_pcm_driver);
MODULE_AUTHOR("Rajeev Kumar <rajeev-dlh.kumar@st.com>");
MODULE_DESCRIPTION("SPEAr PCM DMA module");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:spear-pcm-audio");
|
