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
|
/*
* smdk_spdif.c -- S/PDIF audio for SMDK
*
* Copyright 2010 Samsung Electronics Co. Ltd.
*
* 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/clk.h>
#include <linux/module.h>
#include <sound/soc.h>
#include "spdif.h"
/* Audio clock settings are belonged to board specific part. Every
* board can set audio source clock setting which is matched with H/W
* like this function-'set_audio_clock_heirachy'.
*/
static int set_audio_clock_heirachy(struct platform_device *pdev)
{
struct clk *fout_epll, *mout_epll, *sclk_audio0, *sclk_spdif;
int ret = 0;
fout_epll = clk_get(NULL, "fout_epll");
if (IS_ERR(fout_epll)) {
printk(KERN_WARNING "%s: Cannot find fout_epll.\n",
__func__);
return -EINVAL;
}
mout_epll = clk_get(NULL, "mout_epll");
if (IS_ERR(mout_epll)) {
printk(KERN_WARNING "%s: Cannot find mout_epll.\n",
__func__);
ret = -EINVAL;
goto out1;
}
sclk_audio0 = clk_get(&pdev->dev, "sclk_audio");
if (IS_ERR(sclk_audio0)) {
printk(KERN_WARNING "%s: Cannot find sclk_audio.\n",
__func__);
ret = -EINVAL;
goto out2;
}
sclk_spdif = clk_get(NULL, "sclk_spdif");
if (IS_ERR(sclk_spdif)) {
printk(KERN_WARNING "%s: Cannot find sclk_spdif.\n",
__func__);
ret = -EINVAL;
goto out3;
}
/* Set audio clock hierarchy for S/PDIF */
clk_set_parent(mout_epll, fout_epll);
clk_set_parent(sclk_audio0, mout_epll);
clk_set_parent(sclk_spdif, sclk_audio0);
clk_put(sclk_spdif);
out3:
clk_put(sclk_audio0);
out2:
clk_put(mout_epll);
out1:
clk_put(fout_epll);
return ret;
}
/* We should haved to set clock directly on this part because of clock
* scheme of Samsudng SoCs did not support to set rates from abstrct
* clock of it's hierarchy.
*/
static int set_audio_clock_rate(unsigned long epll_rate,
unsigned long audio_rate)
{
struct clk *fout_epll, *sclk_spdif;
fout_epll = clk_get(NULL, "fout_epll");
if (IS_ERR(fout_epll)) {
printk(KERN_ERR "%s: failed to get fout_epll\n", __func__);
return -ENOENT;
}
clk_set_rate(fout_epll, epll_rate);
clk_put(fout_epll);
sclk_spdif = clk_get(NULL, "sclk_spdif");
if (IS_ERR(sclk_spdif)) {
printk(KERN_ERR "%s: failed to get sclk_spdif\n", __func__);
return -ENOENT;
}
clk_set_rate(sclk_spdif, audio_rate);
clk_put(sclk_spdif);
return 0;
}
static int smdk_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
unsigned long pll_out, rclk_rate;
int ret, ratio;
switch (params_rate(params)) {
case 44100:
pll_out = 45158400;
break;
case 32000:
case 48000:
case 96000:
pll_out = 49152000;
break;
default:
return -EINVAL;
}
/* Setting ratio to 512fs helps to use S/PDIF with HDMI without
* modify S/PDIF ASoC machine driver.
*/
ratio = 512;
rclk_rate = params_rate(params) * ratio;
/* Set audio source clock rates */
ret = set_audio_clock_rate(pll_out, rclk_rate);
if (ret < 0)
return ret;
/* Set S/PDIF uses internal source clock */
ret = snd_soc_dai_set_sysclk(cpu_dai, SND_SOC_SPDIF_INT_MCLK,
rclk_rate, SND_SOC_CLOCK_IN);
if (ret < 0)
return ret;
return ret;
}
static struct snd_soc_ops smdk_spdif_ops = {
.hw_params = smdk_hw_params,
};
static struct snd_soc_dai_link smdk_dai = {
.name = "S/PDIF",
.stream_name = "S/PDIF PCM Playback",
.platform_name = "samsung-audio",
.cpu_dai_name = "samsung-spdif",
.codec_dai_name = "dit-hifi",
.codec_name = "spdif-dit",
.ops = &smdk_spdif_ops,
};
static struct snd_soc_card smdk = {
.name = "SMDK-S/PDIF",
.dai_link = &smdk_dai,
.num_links = 1,
};
static struct platform_device *smdk_snd_spdif_dit_device;
static struct platform_device *smdk_snd_spdif_device;
static int __init smdk_init(void)
{
int ret;
smdk_snd_spdif_dit_device = platform_device_alloc("spdif-dit", -1);
if (!smdk_snd_spdif_dit_device)
return -ENOMEM;
ret = platform_device_add(smdk_snd_spdif_dit_device);
if (ret)
goto err1;
smdk_snd_spdif_device = platform_device_alloc("soc-audio", -1);
if (!smdk_snd_spdif_device) {
ret = -ENOMEM;
goto err2;
}
platform_set_drvdata(smdk_snd_spdif_device, &smdk);
ret = platform_device_add(smdk_snd_spdif_device);
if (ret)
goto err3;
/* Set audio clock hierarchy manually */
ret = set_audio_clock_heirachy(smdk_snd_spdif_device);
if (ret)
goto err4;
return 0;
err4:
platform_device_del(smdk_snd_spdif_device);
err3:
platform_device_put(smdk_snd_spdif_device);
err2:
platform_device_del(smdk_snd_spdif_dit_device);
err1:
platform_device_put(smdk_snd_spdif_dit_device);
return ret;
}
static void __exit smdk_exit(void)
{
platform_device_unregister(smdk_snd_spdif_device);
platform_device_unregister(smdk_snd_spdif_dit_device);
}
module_init(smdk_init);
module_exit(smdk_exit);
MODULE_AUTHOR("Seungwhan Youn, <sw.youn@samsung.com>");
MODULE_DESCRIPTION("ALSA SoC SMDK+S/PDIF");
MODULE_LICENSE("GPL");
|
