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-only
/*
* Copyright (C) 2012-2013, Analog Devices Inc.
* Author: Lars-Peter Clausen <lars@metafoo.de>
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/clk.h>
#include <linux/regmap.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/initval.h>
#include <sound/dmaengine_pcm.h>
#define AXI_SPDIF_REG_CTRL 0x0
#define AXI_SPDIF_REG_STAT 0x4
#define AXI_SPDIF_REG_TX_FIFO 0xc
#define AXI_SPDIF_CTRL_TXDATA BIT(1)
#define AXI_SPDIF_CTRL_TXEN BIT(0)
#define AXI_SPDIF_CTRL_CLKDIV_OFFSET 8
#define AXI_SPDIF_CTRL_CLKDIV_MASK (0xff << 8)
#define AXI_SPDIF_FREQ_44100 (0x0 << 6)
#define AXI_SPDIF_FREQ_48000 (0x1 << 6)
#define AXI_SPDIF_FREQ_32000 (0x2 << 6)
#define AXI_SPDIF_FREQ_NA (0x3 << 6)
struct axi_spdif {
struct regmap *regmap;
struct clk *clk;
struct clk *clk_ref;
struct snd_dmaengine_dai_dma_data dma_data;
struct snd_ratnum ratnum;
struct snd_pcm_hw_constraint_ratnums rate_constraints;
};
static int axi_spdif_trigger(struct snd_pcm_substream *substream, int cmd,
struct snd_soc_dai *dai)
{
struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai);
unsigned int val;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
val = AXI_SPDIF_CTRL_TXDATA;
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
val = 0;
break;
default:
return -EINVAL;
}
regmap_update_bits(spdif->regmap, AXI_SPDIF_REG_CTRL,
AXI_SPDIF_CTRL_TXDATA, val);
return 0;
}
static int axi_spdif_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
{
struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai);
unsigned int rate = params_rate(params);
unsigned int clkdiv, stat;
switch (params_rate(params)) {
case 32000:
stat = AXI_SPDIF_FREQ_32000;
break;
case 44100:
stat = AXI_SPDIF_FREQ_44100;
break;
case 48000:
stat = AXI_SPDIF_FREQ_48000;
break;
default:
stat = AXI_SPDIF_FREQ_NA;
break;
}
clkdiv = DIV_ROUND_CLOSEST(clk_get_rate(spdif->clk_ref),
rate * 64 * 2) - 1;
clkdiv <<= AXI_SPDIF_CTRL_CLKDIV_OFFSET;
regmap_write(spdif->regmap, AXI_SPDIF_REG_STAT, stat);
regmap_update_bits(spdif->regmap, AXI_SPDIF_REG_CTRL,
AXI_SPDIF_CTRL_CLKDIV_MASK, clkdiv);
return 0;
}
static int axi_spdif_dai_probe(struct snd_soc_dai *dai)
{
struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai);
snd_soc_dai_init_dma_data(dai, &spdif->dma_data, NULL);
return 0;
}
static int axi_spdif_startup(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai);
int ret;
ret = snd_pcm_hw_constraint_ratnums(substream->runtime, 0,
SNDRV_PCM_HW_PARAM_RATE,
&spdif->rate_constraints);
if (ret)
return ret;
ret = clk_prepare_enable(spdif->clk_ref);
if (ret)
return ret;
regmap_update_bits(spdif->regmap, AXI_SPDIF_REG_CTRL,
AXI_SPDIF_CTRL_TXEN, AXI_SPDIF_CTRL_TXEN);
return 0;
}
static void axi_spdif_shutdown(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai);
regmap_update_bits(spdif->regmap, AXI_SPDIF_REG_CTRL,
AXI_SPDIF_CTRL_TXEN, 0);
clk_disable_unprepare(spdif->clk_ref);
}
static const struct snd_soc_dai_ops axi_spdif_dai_ops = {
.probe = axi_spdif_dai_probe,
.startup = axi_spdif_startup,
.shutdown = axi_spdif_shutdown,
.trigger = axi_spdif_trigger,
.hw_params = axi_spdif_hw_params,
};
static struct snd_soc_dai_driver axi_spdif_dai = {
.playback = {
.channels_min = 2,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_KNOT,
.formats = SNDRV_PCM_FMTBIT_S16_LE,
},
.ops = &axi_spdif_dai_ops,
};
static const struct snd_soc_component_driver axi_spdif_component = {
.name = "axi-spdif",
.legacy_dai_naming = 1,
};
static const struct regmap_config axi_spdif_regmap_config = {
.reg_bits = 32,
.reg_stride = 4,
.val_bits = 32,
.max_register = AXI_SPDIF_REG_STAT,
};
static int axi_spdif_probe(struct platform_device *pdev)
{
struct axi_spdif *spdif;
struct resource *res;
void __iomem *base;
int ret;
spdif = devm_kzalloc(&pdev->dev, sizeof(*spdif), GFP_KERNEL);
if (!spdif)
return -ENOMEM;
platform_set_drvdata(pdev, spdif);
base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
if (IS_ERR(base))
return PTR_ERR(base);
spdif->regmap = devm_regmap_init_mmio(&pdev->dev, base,
&axi_spdif_regmap_config);
if (IS_ERR(spdif->regmap))
return PTR_ERR(spdif->regmap);
spdif->clk = devm_clk_get(&pdev->dev, "axi");
if (IS_ERR(spdif->clk))
return PTR_ERR(spdif->clk);
spdif->clk_ref = devm_clk_get(&pdev->dev, "ref");
if (IS_ERR(spdif->clk_ref))
return PTR_ERR(spdif->clk_ref);
ret = clk_prepare_enable(spdif->clk);
if (ret)
return ret;
spdif->dma_data.addr = res->start + AXI_SPDIF_REG_TX_FIFO;
spdif->dma_data.addr_width = 4;
spdif->dma_data.maxburst = 1;
spdif->ratnum.num = clk_get_rate(spdif->clk_ref) / 128;
spdif->ratnum.den_step = 1;
spdif->ratnum.den_min = 1;
spdif->ratnum.den_max = 64;
spdif->rate_constraints.rats = &spdif->ratnum;
spdif->rate_constraints.nrats = 1;
ret = devm_snd_soc_register_component(&pdev->dev, &axi_spdif_component,
&axi_spdif_dai, 1);
if (ret)
goto err_clk_disable;
ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
if (ret)
goto err_clk_disable;
return 0;
err_clk_disable:
clk_disable_unprepare(spdif->clk);
return ret;
}
static void axi_spdif_dev_remove(struct platform_device *pdev)
{
struct axi_spdif *spdif = platform_get_drvdata(pdev);
clk_disable_unprepare(spdif->clk);
}
static const struct of_device_id axi_spdif_of_match[] = {
{ .compatible = "adi,axi-spdif-tx-1.00.a", },
{},
};
MODULE_DEVICE_TABLE(of, axi_spdif_of_match);
static struct platform_driver axi_spdif_driver = {
.driver = {
.name = "axi-spdif",
.of_match_table = axi_spdif_of_match,
},
.probe = axi_spdif_probe,
.remove_new = axi_spdif_dev_remove,
};
module_platform_driver(axi_spdif_driver);
MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
MODULE_DESCRIPTION("AXI SPDIF driver");
MODULE_LICENSE("GPL");
|
