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
|
// SPDX-License-Identifier: GPL-2.0
//
// Xilinx ASoC I2S audio support
//
// Copyright (C) 2018 Xilinx, Inc.
//
// Author: Praveen Vuppala <praveenv@xilinx.com>
// Author: Maruthi Srinivas Bayyavarapu <maruthis@xilinx.com>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#define DRV_NAME "xlnx_i2s"
#define I2S_CORE_CTRL_OFFSET 0x08
#define I2S_CORE_CTRL_32BIT_LRCLK BIT(3)
#define I2S_CORE_CTRL_ENABLE BIT(0)
#define I2S_I2STIM_OFFSET 0x20
#define I2S_CH0_OFFSET 0x30
#define I2S_I2STIM_VALID_MASK GENMASK(7, 0)
struct xlnx_i2s_drv_data {
struct snd_soc_dai_driver dai_drv;
void __iomem *base;
unsigned int sysclk;
u32 data_width;
u32 channels;
bool is_32bit_lrclk;
struct snd_ratnum ratnum;
struct snd_pcm_hw_constraint_ratnums rate_constraints;
};
static int xlnx_i2s_set_sclkout_div(struct snd_soc_dai *cpu_dai,
int div_id, int div)
{
struct xlnx_i2s_drv_data *drv_data = snd_soc_dai_get_drvdata(cpu_dai);
if (!div || (div & ~I2S_I2STIM_VALID_MASK))
return -EINVAL;
drv_data->sysclk = 0;
writel(div, drv_data->base + I2S_I2STIM_OFFSET);
return 0;
}
static int xlnx_i2s_set_sysclk(struct snd_soc_dai *dai,
int clk_id, unsigned int freq, int dir)
{
struct xlnx_i2s_drv_data *drv_data = snd_soc_dai_get_drvdata(dai);
drv_data->sysclk = freq;
if (freq) {
unsigned int bits_per_sample;
if (drv_data->is_32bit_lrclk)
bits_per_sample = 32;
else
bits_per_sample = drv_data->data_width;
drv_data->ratnum.num = freq / (bits_per_sample * drv_data->channels) / 2;
drv_data->ratnum.den_step = 1;
drv_data->ratnum.den_min = 1;
drv_data->ratnum.den_max = 255;
drv_data->rate_constraints.rats = &drv_data->ratnum;
drv_data->rate_constraints.nrats = 1;
}
return 0;
}
static int xlnx_i2s_startup(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct xlnx_i2s_drv_data *drv_data = snd_soc_dai_get_drvdata(dai);
if (drv_data->sysclk)
return snd_pcm_hw_constraint_ratnums(substream->runtime, 0,
SNDRV_PCM_HW_PARAM_RATE,
&drv_data->rate_constraints);
return 0;
}
static int xlnx_i2s_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *i2s_dai)
{
u32 reg_off, chan_id;
struct xlnx_i2s_drv_data *drv_data = snd_soc_dai_get_drvdata(i2s_dai);
if (drv_data->sysclk) {
unsigned int bits_per_sample, sclk, sclk_div;
if (drv_data->is_32bit_lrclk)
bits_per_sample = 32;
else
bits_per_sample = drv_data->data_width;
sclk = params_rate(params) * bits_per_sample * params_channels(params);
sclk_div = drv_data->sysclk / sclk / 2;
if ((drv_data->sysclk % sclk != 0) ||
!sclk_div || (sclk_div & ~I2S_I2STIM_VALID_MASK)) {
dev_warn(i2s_dai->dev, "invalid SCLK divisor for sysclk %u and sclk %u\n",
drv_data->sysclk, sclk);
return -EINVAL;
}
writel(sclk_div, drv_data->base + I2S_I2STIM_OFFSET);
}
chan_id = params_channels(params) / 2;
while (chan_id > 0) {
reg_off = I2S_CH0_OFFSET + ((chan_id - 1) * 4);
writel(chan_id, drv_data->base + reg_off);
chan_id--;
}
return 0;
}
static int xlnx_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
struct snd_soc_dai *i2s_dai)
{
struct xlnx_i2s_drv_data *drv_data = snd_soc_dai_get_drvdata(i2s_dai);
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
writel(I2S_CORE_CTRL_ENABLE, drv_data->base + I2S_CORE_CTRL_OFFSET);
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
writel(0, drv_data->base + I2S_CORE_CTRL_OFFSET);
break;
default:
return -EINVAL;
}
return 0;
}
static const struct snd_soc_dai_ops xlnx_i2s_dai_ops = {
.trigger = xlnx_i2s_trigger,
.set_sysclk = xlnx_i2s_set_sysclk,
.set_clkdiv = xlnx_i2s_set_sclkout_div,
.startup = xlnx_i2s_startup,
.hw_params = xlnx_i2s_hw_params
};
static const struct snd_soc_component_driver xlnx_i2s_component = {
.name = DRV_NAME,
};
static const struct of_device_id xlnx_i2s_of_match[] = {
{ .compatible = "xlnx,i2s-transmitter-1.0", },
{ .compatible = "xlnx,i2s-receiver-1.0", },
{},
};
MODULE_DEVICE_TABLE(of, xlnx_i2s_of_match);
static int xlnx_i2s_probe(struct platform_device *pdev)
{
struct xlnx_i2s_drv_data *drv_data;
int ret;
u32 format;
struct device *dev = &pdev->dev;
struct device_node *node = dev->of_node;
drv_data = devm_kzalloc(&pdev->dev, sizeof(*drv_data), GFP_KERNEL);
if (!drv_data)
return -ENOMEM;
drv_data->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(drv_data->base))
return PTR_ERR(drv_data->base);
ret = of_property_read_u32(node, "xlnx,num-channels", &drv_data->channels);
if (ret < 0) {
dev_err(dev, "cannot get supported channels\n");
return ret;
}
drv_data->channels *= 2;
ret = of_property_read_u32(node, "xlnx,dwidth", &drv_data->data_width);
if (ret < 0) {
dev_err(dev, "cannot get data width\n");
return ret;
}
switch (drv_data->data_width) {
case 16:
format = SNDRV_PCM_FMTBIT_S16_LE;
break;
case 24:
format = SNDRV_PCM_FMTBIT_S24_LE;
break;
default:
return -EINVAL;
}
if (of_device_is_compatible(node, "xlnx,i2s-transmitter-1.0")) {
drv_data->dai_drv.name = "xlnx_i2s_playback";
drv_data->dai_drv.playback.stream_name = "Playback";
drv_data->dai_drv.playback.formats = format;
drv_data->dai_drv.playback.channels_min = drv_data->channels;
drv_data->dai_drv.playback.channels_max = drv_data->channels;
drv_data->dai_drv.playback.rates = SNDRV_PCM_RATE_8000_192000;
drv_data->dai_drv.ops = &xlnx_i2s_dai_ops;
} else if (of_device_is_compatible(node, "xlnx,i2s-receiver-1.0")) {
drv_data->dai_drv.name = "xlnx_i2s_capture";
drv_data->dai_drv.capture.stream_name = "Capture";
drv_data->dai_drv.capture.formats = format;
drv_data->dai_drv.capture.channels_min = drv_data->channels;
drv_data->dai_drv.capture.channels_max = drv_data->channels;
drv_data->dai_drv.capture.rates = SNDRV_PCM_RATE_8000_192000;
drv_data->dai_drv.ops = &xlnx_i2s_dai_ops;
} else {
return -ENODEV;
}
drv_data->is_32bit_lrclk = readl(drv_data->base + I2S_CORE_CTRL_OFFSET) &
I2S_CORE_CTRL_32BIT_LRCLK;
dev_set_drvdata(&pdev->dev, drv_data);
ret = devm_snd_soc_register_component(&pdev->dev, &xlnx_i2s_component,
&drv_data->dai_drv, 1);
if (ret) {
dev_err(&pdev->dev, "i2s component registration failed\n");
return ret;
}
dev_info(&pdev->dev, "%s DAI registered\n", drv_data->dai_drv.name);
return ret;
}
static struct platform_driver xlnx_i2s_aud_driver = {
.driver = {
.name = DRV_NAME,
.of_match_table = xlnx_i2s_of_match,
},
.probe = xlnx_i2s_probe,
};
module_platform_driver(xlnx_i2s_aud_driver);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Praveen Vuppala <praveenv@xilinx.com>");
MODULE_AUTHOR("Maruthi Srinivas Bayyavarapu <maruthis@xilinx.com>");
|
