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
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
|
/*
* omap-pcm.c -- ALSA PCM interface for the OMAP SoC
*
* Copyright (C) 2008 Nokia Corporation
*
* Contact: Jarkko Nikula <jarkko.nikula@bitmer.com>
* Peter Ujfalusi <peter.ujfalusi@ti.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
*/
#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/omap-dma.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/dmaengine_pcm.h>
#include <sound/soc.h>
#ifdef CONFIG_ARCH_OMAP1
#define pcm_omap1510() cpu_is_omap1510()
#else
#define pcm_omap1510() 0
#endif
static const struct snd_pcm_hardware omap_pcm_hardware = {
.info = SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_MMAP_VALID |
SNDRV_PCM_INFO_INTERLEAVED |
SNDRV_PCM_INFO_PAUSE |
SNDRV_PCM_INFO_RESUME |
SNDRV_PCM_INFO_NO_PERIOD_WAKEUP,
.period_bytes_min = 32,
.period_bytes_max = 64 * 1024,
.periods_min = 2,
.periods_max = 255,
.buffer_bytes_max = 128 * 1024,
};
/* this may get called several times by oss emulation */
static int omap_pcm_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct omap_pcm_dma_data *dma_data;
struct dma_slave_config config;
struct dma_chan *chan;
int err = 0;
dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
/* return if this is a bufferless transfer e.g.
* codec <--> BT codec or GSM modem -- lg FIXME */
if (!dma_data)
return 0;
snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
runtime->dma_bytes = params_buffer_bytes(params);
chan = snd_dmaengine_pcm_get_chan(substream);
if (!chan)
return -EINVAL;
/* fills in addr_width and direction */
err = snd_hwparams_to_dma_slave_config(substream, params, &config);
if (err)
return err;
snd_dmaengine_pcm_set_config_from_dai_data(substream,
snd_soc_dai_get_dma_data(rtd->cpu_dai, substream),
&config);
return dmaengine_slave_config(chan, &config);
}
static int omap_pcm_hw_free(struct snd_pcm_substream *substream)
{
snd_pcm_set_runtime_buffer(substream, NULL);
return 0;
}
static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream)
{
snd_pcm_uframes_t offset;
if (pcm_omap1510())
offset = snd_dmaengine_pcm_pointer_no_residue(substream);
else
offset = snd_dmaengine_pcm_pointer(substream);
return offset;
}
static int omap_pcm_open(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_dmaengine_dai_dma_data *dma_data;
int ret;
snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware);
dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
/* DT boot: filter_data is the DMA name */
if (rtd->cpu_dai->dev->of_node) {
struct dma_chan *chan;
chan = dma_request_slave_channel(rtd->cpu_dai->dev,
dma_data->filter_data);
ret = snd_dmaengine_pcm_open(substream, chan);
} else {
ret = snd_dmaengine_pcm_open_request_chan(substream,
omap_dma_filter_fn,
dma_data->filter_data);
}
return ret;
}
static int omap_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 omap_pcm_ops = {
.open = omap_pcm_open,
.close = snd_dmaengine_pcm_close_release_chan,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = omap_pcm_hw_params,
.hw_free = omap_pcm_hw_free,
.trigger = snd_dmaengine_pcm_trigger,
.pointer = omap_pcm_pointer,
.mmap = omap_pcm_mmap,
};
static int omap_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
int stream)
{
struct snd_pcm_substream *substream = pcm->streams[stream].substream;
struct snd_dma_buffer *buf = &substream->dma_buffer;
size_t size = omap_pcm_hardware.buffer_bytes_max;
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;
buf->bytes = size;
return 0;
}
static void omap_pcm_free_dma_buffers(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->area)
continue;
dma_free_writecombine(pcm->card->dev, buf->bytes,
buf->area, buf->addr);
buf->area = NULL;
}
}
static int omap_pcm_new(struct snd_soc_pcm_runtime *rtd)
{
struct snd_card *card = rtd->card->snd_card;
struct snd_pcm *pcm = rtd->pcm;
int ret;
ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(64));
if (ret)
return ret;
if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
ret = omap_pcm_preallocate_dma_buffer(pcm,
SNDRV_PCM_STREAM_PLAYBACK);
if (ret)
goto out;
}
if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
ret = omap_pcm_preallocate_dma_buffer(pcm,
SNDRV_PCM_STREAM_CAPTURE);
if (ret)
goto out;
}
out:
/* free preallocated buffers in case of error */
if (ret)
omap_pcm_free_dma_buffers(pcm);
return ret;
}
static struct snd_soc_platform_driver omap_soc_platform = {
.ops = &omap_pcm_ops,
.pcm_new = omap_pcm_new,
.pcm_free = omap_pcm_free_dma_buffers,
};
int omap_pcm_platform_register(struct device *dev)
{
return devm_snd_soc_register_platform(dev, &omap_soc_platform);
}
EXPORT_SYMBOL_GPL(omap_pcm_platform_register);
MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@bitmer.com>");
MODULE_DESCRIPTION("OMAP PCM DMA module");
MODULE_LICENSE("GPL");
|
