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
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
|
// SPDX-License-Identifier: GPL-2.0-or-later
// linux/sound/bcm/bcm63xx-i2s-whistler.c
// BCM63xx whistler i2s driver
// Copyright (c) 2020 Broadcom Corporation
// Author: Kevin-Ke Li <kevin-ke.li@broadcom.com>
#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include "bcm63xx-i2s.h"
#define DRV_NAME "brcm-i2s"
static bool brcm_i2s_wr_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case I2S_TX_CFG ... I2S_TX_DESC_IFF_LEN:
case I2S_TX_CFG_2 ... I2S_RX_DESC_IFF_LEN:
case I2S_RX_CFG_2 ... I2S_REG_MAX:
return true;
default:
return false;
}
}
static bool brcm_i2s_rd_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case I2S_TX_CFG ... I2S_REG_MAX:
return true;
default:
return false;
}
}
static bool brcm_i2s_volatile_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case I2S_TX_CFG:
case I2S_TX_IRQ_CTL:
case I2S_TX_DESC_IFF_ADDR:
case I2S_TX_DESC_IFF_LEN:
case I2S_TX_DESC_OFF_ADDR:
case I2S_TX_DESC_OFF_LEN:
case I2S_TX_CFG_2:
case I2S_RX_CFG:
case I2S_RX_IRQ_CTL:
case I2S_RX_DESC_OFF_ADDR:
case I2S_RX_DESC_OFF_LEN:
case I2S_RX_DESC_IFF_LEN:
case I2S_RX_DESC_IFF_ADDR:
case I2S_RX_CFG_2:
return true;
default:
return false;
}
}
static const struct regmap_config brcm_i2s_regmap_config = {
.reg_bits = 32,
.reg_stride = 4,
.val_bits = 32,
.max_register = I2S_REG_MAX,
.writeable_reg = brcm_i2s_wr_reg,
.readable_reg = brcm_i2s_rd_reg,
.volatile_reg = brcm_i2s_volatile_reg,
.cache_type = REGCACHE_FLAT,
};
static int bcm63xx_i2s_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
int ret = 0;
struct bcm_i2s_priv *i2s_priv = snd_soc_dai_get_drvdata(dai);
ret = clk_set_rate(i2s_priv->i2s_clk, params_rate(params));
if (ret < 0)
dev_err(i2s_priv->dev,
"Can't set sample rate, err: %d\n", ret);
return ret;
}
static int bcm63xx_i2s_startup(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
unsigned int slavemode;
struct bcm_i2s_priv *i2s_priv = snd_soc_dai_get_drvdata(dai);
struct regmap *regmap_i2s = i2s_priv->regmap_i2s;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
regmap_update_bits(regmap_i2s, I2S_TX_CFG,
I2S_TX_OUT_R | I2S_TX_DATA_ALIGNMENT |
I2S_TX_DATA_ENABLE | I2S_TX_CLOCK_ENABLE,
I2S_TX_OUT_R | I2S_TX_DATA_ALIGNMENT |
I2S_TX_DATA_ENABLE | I2S_TX_CLOCK_ENABLE);
regmap_write(regmap_i2s, I2S_TX_IRQ_CTL, 0);
regmap_write(regmap_i2s, I2S_TX_IRQ_IFF_THLD, 0);
regmap_write(regmap_i2s, I2S_TX_IRQ_OFF_THLD, 1);
/* TX and RX block each have an independent bit to indicate
* if it is generating the clock for the I2S bus. The bus
* clocks need to be generated from either the TX or RX block,
* but not both
*/
regmap_read(regmap_i2s, I2S_RX_CFG_2, &slavemode);
if (slavemode & I2S_RX_SLAVE_MODE_MASK)
regmap_update_bits(regmap_i2s, I2S_TX_CFG_2,
I2S_TX_SLAVE_MODE_MASK,
I2S_TX_MASTER_MODE);
else
regmap_update_bits(regmap_i2s, I2S_TX_CFG_2,
I2S_TX_SLAVE_MODE_MASK,
I2S_TX_SLAVE_MODE);
} else {
regmap_update_bits(regmap_i2s, I2S_RX_CFG,
I2S_RX_IN_R | I2S_RX_DATA_ALIGNMENT |
I2S_RX_CLOCK_ENABLE,
I2S_RX_IN_R | I2S_RX_DATA_ALIGNMENT |
I2S_RX_CLOCK_ENABLE);
regmap_write(regmap_i2s, I2S_RX_IRQ_CTL, 0);
regmap_write(regmap_i2s, I2S_RX_IRQ_IFF_THLD, 0);
regmap_write(regmap_i2s, I2S_RX_IRQ_OFF_THLD, 1);
regmap_read(regmap_i2s, I2S_TX_CFG_2, &slavemode);
if (slavemode & I2S_TX_SLAVE_MODE_MASK)
regmap_update_bits(regmap_i2s, I2S_RX_CFG_2,
I2S_RX_SLAVE_MODE_MASK, 0);
else
regmap_update_bits(regmap_i2s, I2S_RX_CFG_2,
I2S_RX_SLAVE_MODE_MASK,
I2S_RX_SLAVE_MODE);
}
return 0;
}
static void bcm63xx_i2s_shutdown(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
unsigned int enabled, slavemode;
struct bcm_i2s_priv *i2s_priv = snd_soc_dai_get_drvdata(dai);
struct regmap *regmap_i2s = i2s_priv->regmap_i2s;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
regmap_update_bits(regmap_i2s, I2S_TX_CFG,
I2S_TX_OUT_R | I2S_TX_DATA_ALIGNMENT |
I2S_TX_DATA_ENABLE | I2S_TX_CLOCK_ENABLE, 0);
regmap_write(regmap_i2s, I2S_TX_IRQ_CTL, 1);
regmap_write(regmap_i2s, I2S_TX_IRQ_IFF_THLD, 4);
regmap_write(regmap_i2s, I2S_TX_IRQ_OFF_THLD, 4);
regmap_read(regmap_i2s, I2S_TX_CFG_2, &slavemode);
slavemode = slavemode & I2S_TX_SLAVE_MODE_MASK;
if (!slavemode) {
regmap_read(regmap_i2s, I2S_RX_CFG, &enabled);
enabled = enabled & I2S_RX_ENABLE_MASK;
if (enabled)
regmap_update_bits(regmap_i2s, I2S_RX_CFG_2,
I2S_RX_SLAVE_MODE_MASK,
I2S_RX_MASTER_MODE);
}
regmap_update_bits(regmap_i2s, I2S_TX_CFG_2,
I2S_TX_SLAVE_MODE_MASK,
I2S_TX_SLAVE_MODE);
} else {
regmap_update_bits(regmap_i2s, I2S_RX_CFG,
I2S_RX_IN_R | I2S_RX_DATA_ALIGNMENT |
I2S_RX_CLOCK_ENABLE, 0);
regmap_write(regmap_i2s, I2S_RX_IRQ_CTL, 1);
regmap_write(regmap_i2s, I2S_RX_IRQ_IFF_THLD, 4);
regmap_write(regmap_i2s, I2S_RX_IRQ_OFF_THLD, 4);
regmap_read(regmap_i2s, I2S_RX_CFG_2, &slavemode);
slavemode = slavemode & I2S_RX_SLAVE_MODE_MASK;
if (!slavemode) {
regmap_read(regmap_i2s, I2S_TX_CFG, &enabled);
enabled = enabled & I2S_TX_ENABLE_MASK;
if (enabled)
regmap_update_bits(regmap_i2s, I2S_TX_CFG_2,
I2S_TX_SLAVE_MODE_MASK,
I2S_TX_MASTER_MODE);
}
regmap_update_bits(regmap_i2s, I2S_RX_CFG_2,
I2S_RX_SLAVE_MODE_MASK, I2S_RX_SLAVE_MODE);
}
}
static const struct snd_soc_dai_ops bcm63xx_i2s_dai_ops = {
.startup = bcm63xx_i2s_startup,
.shutdown = bcm63xx_i2s_shutdown,
.hw_params = bcm63xx_i2s_hw_params,
};
static struct snd_soc_dai_driver bcm63xx_i2s_dai = {
.name = DRV_NAME,
.playback = {
.channels_min = 2,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_8000_192000,
.formats = SNDRV_PCM_FMTBIT_S32_LE,
},
.capture = {
.channels_min = 2,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_8000_192000,
.formats = SNDRV_PCM_FMTBIT_S32_LE,
},
.ops = &bcm63xx_i2s_dai_ops,
.symmetric_rate = 1,
.symmetric_channels = 1,
};
static const struct snd_soc_component_driver bcm63xx_i2s_component = {
.name = "bcm63xx",
};
static int bcm63xx_i2s_dev_probe(struct platform_device *pdev)
{
int ret = 0;
void __iomem *regs;
struct resource *r_mem, *region;
struct bcm_i2s_priv *i2s_priv;
struct regmap *regmap_i2s;
struct clk *i2s_clk;
i2s_priv = devm_kzalloc(&pdev->dev, sizeof(*i2s_priv), GFP_KERNEL);
if (!i2s_priv)
return -ENOMEM;
i2s_clk = devm_clk_get(&pdev->dev, "i2sclk");
if (IS_ERR(i2s_clk)) {
dev_err(&pdev->dev, "%s: cannot get a brcm clock: %ld\n",
__func__, PTR_ERR(i2s_clk));
return PTR_ERR(i2s_clk);
}
r_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!r_mem) {
dev_err(&pdev->dev, "Unable to get register resource.\n");
return -ENODEV;
}
region = devm_request_mem_region(&pdev->dev, r_mem->start,
resource_size(r_mem), DRV_NAME);
if (!region) {
dev_err(&pdev->dev, "Memory region already claimed\n");
return -EBUSY;
}
regs = devm_ioremap_resource(&pdev->dev, r_mem);
if (IS_ERR(regs)) {
ret = PTR_ERR(regs);
return ret;
}
regmap_i2s = devm_regmap_init_mmio(&pdev->dev,
regs, &brcm_i2s_regmap_config);
if (IS_ERR(regmap_i2s))
return PTR_ERR(regmap_i2s);
regmap_update_bits(regmap_i2s, I2S_MISC_CFG,
I2S_PAD_LVL_LOOP_DIS_MASK,
I2S_PAD_LVL_LOOP_DIS_ENABLE);
ret = devm_snd_soc_register_component(&pdev->dev,
&bcm63xx_i2s_component,
&bcm63xx_i2s_dai, 1);
if (ret) {
dev_err(&pdev->dev, "failed to register the dai\n");
return ret;
}
i2s_priv->dev = &pdev->dev;
i2s_priv->i2s_clk = i2s_clk;
i2s_priv->regmap_i2s = regmap_i2s;
dev_set_drvdata(&pdev->dev, i2s_priv);
ret = bcm63xx_soc_platform_probe(pdev, i2s_priv);
if (ret)
dev_err(&pdev->dev, "failed to register the pcm\n");
return ret;
}
static int bcm63xx_i2s_dev_remove(struct platform_device *pdev)
{
bcm63xx_soc_platform_remove(pdev);
return 0;
}
#ifdef CONFIG_OF
static const struct of_device_id snd_soc_bcm_audio_match[] = {
{.compatible = "brcm,bcm63xx-i2s"},
{ }
};
#endif
static struct platform_driver bcm63xx_i2s_driver = {
.driver = {
.name = DRV_NAME,
.of_match_table = of_match_ptr(snd_soc_bcm_audio_match),
},
.probe = bcm63xx_i2s_dev_probe,
.remove = bcm63xx_i2s_dev_remove,
};
module_platform_driver(bcm63xx_i2s_driver);
MODULE_AUTHOR("Kevin,Li <kevin-ke.li@broadcom.com>");
MODULE_DESCRIPTION("Broadcom DSL XPON ASOC I2S Interface");
MODULE_LICENSE("GPL v2");
|
