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
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* linux/sound/soc/pxa/mmp-pcm.c
*
* Copyright (C) 2011 Marvell International Ltd.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
#include <linux/platform_data/dma-mmp_tdma.h>
#include <linux/platform_data/mmp_audio.h>
#include <sound/pxa2xx-lib.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/dmaengine_pcm.h>
#define DRV_NAME "mmp-pcm"
struct mmp_dma_data {
int ssp_id;
struct resource *dma_res;
};
#define MMP_PCM_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)
static struct snd_pcm_hardware mmp_pcm_hardware[] = {
{
.info = MMP_PCM_INFO,
.period_bytes_min = 1024,
.period_bytes_max = 2048,
.periods_min = 2,
.periods_max = 32,
.buffer_bytes_max = 4096,
.fifo_size = 32,
},
{
.info = MMP_PCM_INFO,
.period_bytes_min = 1024,
.period_bytes_max = 2048,
.periods_min = 2,
.periods_max = 32,
.buffer_bytes_max = 4096,
.fifo_size = 32,
},
};
static int mmp_pcm_hw_params(struct snd_soc_component *component,
struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
struct dma_slave_config slave_config;
int ret;
ret =
snd_dmaengine_pcm_prepare_slave_config(substream, params,
&slave_config);
if (ret)
return ret;
ret = dmaengine_slave_config(chan, &slave_config);
if (ret)
return ret;
snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
return 0;
}
static int mmp_pcm_trigger(struct snd_soc_component *component,
struct snd_pcm_substream *substream, int cmd)
{
return snd_dmaengine_pcm_trigger(substream, cmd);
}
static snd_pcm_uframes_t mmp_pcm_pointer(struct snd_soc_component *component,
struct snd_pcm_substream *substream)
{
return snd_dmaengine_pcm_pointer(substream);
}
static bool filter(struct dma_chan *chan, void *param)
{
struct mmp_dma_data *dma_data = param;
bool found = false;
char *devname;
devname = kasprintf(GFP_KERNEL, "%s.%d", dma_data->dma_res->name,
dma_data->ssp_id);
if ((strcmp(dev_name(chan->device->dev), devname) == 0) &&
(chan->chan_id == dma_data->dma_res->start)) {
found = true;
}
kfree(devname);
return found;
}
static int mmp_pcm_open(struct snd_soc_component *component,
struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct platform_device *pdev = to_platform_device(component->dev);
struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
struct mmp_dma_data dma_data;
struct resource *r;
r = platform_get_resource(pdev, IORESOURCE_DMA, substream->stream);
if (!r)
return -EBUSY;
snd_soc_set_runtime_hwparams(substream,
&mmp_pcm_hardware[substream->stream]);
dma_data.dma_res = r;
dma_data.ssp_id = cpu_dai->id;
return snd_dmaengine_pcm_open_request_chan(substream, filter,
&dma_data);
}
static int mmp_pcm_close(struct snd_soc_component *component,
struct snd_pcm_substream *substream)
{
return snd_dmaengine_pcm_close_release_chan(substream);
}
static int mmp_pcm_mmap(struct snd_soc_component *component,
struct snd_pcm_substream *substream,
struct vm_area_struct *vma)
{
struct snd_pcm_runtime *runtime = substream->runtime;
unsigned long off = vma->vm_pgoff;
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
return remap_pfn_range(vma, vma->vm_start,
__phys_to_pfn(runtime->dma_addr) + off,
vma->vm_end - vma->vm_start, vma->vm_page_prot);
}
static void mmp_pcm_free_dma_buffers(struct snd_soc_component *component,
struct snd_pcm *pcm)
{
struct snd_pcm_substream *substream;
struct snd_dma_buffer *buf;
int stream;
struct gen_pool *gpool;
gpool = sram_get_gpool("asram");
if (!gpool)
return;
for (stream = 0; stream < 2; stream++) {
size_t size = mmp_pcm_hardware[stream].buffer_bytes_max;
substream = pcm->streams[stream].substream;
if (!substream)
continue;
buf = &substream->dma_buffer;
if (!buf->area)
continue;
gen_pool_free(gpool, (unsigned long)buf->area, size);
buf->area = NULL;
}
}
static int mmp_pcm_preallocate_dma_buffer(struct snd_pcm_substream *substream,
int stream)
{
struct snd_dma_buffer *buf = &substream->dma_buffer;
size_t size = mmp_pcm_hardware[stream].buffer_bytes_max;
struct gen_pool *gpool;
buf->dev.type = SNDRV_DMA_TYPE_DEV;
buf->dev.dev = substream->pcm->card->dev;
buf->private_data = NULL;
gpool = sram_get_gpool("asram");
if (!gpool)
return -ENOMEM;
buf->area = gen_pool_dma_alloc(gpool, size, &buf->addr);
if (!buf->area)
return -ENOMEM;
buf->bytes = size;
return 0;
}
static int mmp_pcm_new(struct snd_soc_component *component,
struct snd_soc_pcm_runtime *rtd)
{
struct snd_pcm_substream *substream;
struct snd_pcm *pcm = rtd->pcm;
int ret = 0, stream;
for (stream = 0; stream < 2; stream++) {
substream = pcm->streams[stream].substream;
ret = mmp_pcm_preallocate_dma_buffer(substream, stream);
if (ret)
goto err;
}
return 0;
err:
mmp_pcm_free_dma_buffers(component, pcm);
return ret;
}
static const struct snd_soc_component_driver mmp_soc_component = {
.name = DRV_NAME,
.open = mmp_pcm_open,
.close = mmp_pcm_close,
.hw_params = mmp_pcm_hw_params,
.trigger = mmp_pcm_trigger,
.pointer = mmp_pcm_pointer,
.mmap = mmp_pcm_mmap,
.pcm_construct = mmp_pcm_new,
.pcm_destruct = mmp_pcm_free_dma_buffers,
};
static int mmp_pcm_probe(struct platform_device *pdev)
{
struct mmp_audio_platdata *pdata = pdev->dev.platform_data;
if (pdata) {
mmp_pcm_hardware[SNDRV_PCM_STREAM_PLAYBACK].buffer_bytes_max =
pdata->buffer_max_playback;
mmp_pcm_hardware[SNDRV_PCM_STREAM_PLAYBACK].period_bytes_max =
pdata->period_max_playback;
mmp_pcm_hardware[SNDRV_PCM_STREAM_CAPTURE].buffer_bytes_max =
pdata->buffer_max_capture;
mmp_pcm_hardware[SNDRV_PCM_STREAM_CAPTURE].period_bytes_max =
pdata->period_max_capture;
}
return devm_snd_soc_register_component(&pdev->dev, &mmp_soc_component,
NULL, 0);
}
static struct platform_driver mmp_pcm_driver = {
.driver = {
.name = "mmp-pcm-audio",
},
.probe = mmp_pcm_probe,
};
module_platform_driver(mmp_pcm_driver);
MODULE_AUTHOR("Leo Yan <leoy@marvell.com>");
MODULE_DESCRIPTION("MMP Soc Audio DMA module");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:mmp-pcm-audio");
|