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
|
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2021 StarFive Technology Co., Ltd.
*/
#include <linux/io.h>
#include <linux/rcupdate.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include "i2svad.h"
#define BUFFER_BYTES_MAX (3 * 2 * 8 * PERIOD_BYTES_MIN)
#define PERIOD_BYTES_MIN 4096
#define PERIODS_MIN 2
#define i2svad_pcm_tx_fn(sample_bits) \
static unsigned int i2svad_pcm_tx_##sample_bits(struct i2svad_dev *dev, \
struct snd_pcm_runtime *runtime, unsigned int tx_ptr, \
bool *period_elapsed) \
{ \
const u##sample_bits (*p)[2] = (void *)runtime->dma_area; \
unsigned int period_pos = tx_ptr % runtime->period_size; \
int i; \
\
for (i = 0; i < dev->fifo_th; i++) { \
iowrite32(p[tx_ptr][0], dev->i2s_base + LRBR_LTHR(0)); \
iowrite32(p[tx_ptr][1], dev->i2s_base + RRBR_RTHR(0)); \
period_pos++; \
if (++tx_ptr >= runtime->buffer_size) \
tx_ptr = 0; \
} \
*period_elapsed = period_pos >= runtime->period_size; \
return tx_ptr; \
}
#define i2svad_pcm_rx_fn(sample_bits) \
static unsigned int i2svad_pcm_rx_##sample_bits(struct i2svad_dev *dev, \
struct snd_pcm_runtime *runtime, unsigned int rx_ptr, \
bool *period_elapsed) \
{ \
u##sample_bits (*p)[2] = (void *)runtime->dma_area; \
unsigned int period_pos = rx_ptr % runtime->period_size; \
int i; \
\
for (i = 0; i < dev->fifo_th; i++) { \
p[rx_ptr][0] = ioread32(dev->i2s_base + LRBR_LTHR(0)); \
p[rx_ptr][1] = ioread32(dev->i2s_base + RRBR_RTHR(0)); \
period_pos++; \
if (++rx_ptr >= runtime->buffer_size) \
rx_ptr = 0; \
} \
*period_elapsed = period_pos >= runtime->period_size; \
return rx_ptr; \
}
i2svad_pcm_tx_fn(16);
i2svad_pcm_rx_fn(16);
#undef i2svad_pcm_tx_fn
#undef i2svad_pcm_rx_fn
static const struct snd_pcm_hardware i2svad_pcm_hardware = {
.info = SNDRV_PCM_INFO_INTERLEAVED |
SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_MMAP_VALID |
SNDRV_PCM_INFO_BLOCK_TRANSFER,
.rates = SNDRV_PCM_RATE_32000 |
SNDRV_PCM_RATE_44100 |
SNDRV_PCM_RATE_48000,
.rate_min = 32000,
.rate_max = 48000,
.formats = SNDRV_PCM_FMTBIT_S16_LE,
.channels_min = 2,
.channels_max = 2,
.buffer_bytes_max = BUFFER_BYTES_MAX,
.period_bytes_min = PERIOD_BYTES_MIN,
.period_bytes_max = BUFFER_BYTES_MAX / PERIODS_MIN,
.periods_min = PERIODS_MIN,
.periods_max = BUFFER_BYTES_MAX / PERIOD_BYTES_MIN,
.fifo_size = 16,
};
static void i2svad_pcm_transfer(struct i2svad_dev *dev, bool push)
{
struct snd_pcm_substream *substream;
bool active, period_elapsed;
rcu_read_lock();
if (push)
substream = rcu_dereference(dev->tx_substream);
else
substream = rcu_dereference(dev->rx_substream);
active = substream && snd_pcm_running(substream);
if (active) {
unsigned int ptr;
unsigned int new_ptr;
if (push) {
ptr = READ_ONCE(dev->tx_ptr);
new_ptr = dev->tx_fn(dev, substream->runtime, ptr,
&period_elapsed);
cmpxchg(&dev->tx_ptr, ptr, new_ptr);
} else {
ptr = READ_ONCE(dev->rx_ptr);
new_ptr = dev->rx_fn(dev, substream->runtime, ptr,
&period_elapsed);
cmpxchg(&dev->rx_ptr, ptr, new_ptr);
}
if (period_elapsed)
snd_pcm_period_elapsed(substream);
}
rcu_read_unlock();
}
void i2svad_pcm_push_tx(struct i2svad_dev *dev)
{
i2svad_pcm_transfer(dev, true);
}
void i2svad_pcm_pop_rx(struct i2svad_dev *dev)
{
i2svad_pcm_transfer(dev, false);
}
static int i2svad_pcm_open(struct snd_soc_component *component,
struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
struct i2svad_dev *dev = snd_soc_dai_get_drvdata(snd_soc_rtd_to_cpu(rtd, 0));
snd_soc_set_runtime_hwparams(substream, &i2svad_pcm_hardware);
snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
runtime->private_data = dev;
return 0;
}
static int i2svad_pcm_close(struct snd_soc_component *component,
struct snd_pcm_substream *substream)
{
synchronize_rcu();
return 0;
}
static int i2svad_pcm_hw_params(struct snd_soc_component *component,
struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct i2svad_dev *dev = runtime->private_data;
switch (params_channels(hw_params)) {
case 2:
break;
default:
dev_err(dev->dev, "invalid channels number\n");
return -EINVAL;
}
switch (params_format(hw_params)) {
case SNDRV_PCM_FORMAT_S16_LE:
dev->tx_fn = i2svad_pcm_tx_16;
dev->rx_fn = i2svad_pcm_rx_16;
break;
default:
dev_err(dev->dev, "invalid format\n");
return -EINVAL;
}
return 0;
}
static int i2svad_pcm_trigger(struct snd_soc_component *component,
struct snd_pcm_substream *substream, int cmd)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct i2svad_dev *dev = runtime->private_data;
int ret = 0;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
WRITE_ONCE(dev->tx_ptr, 0);
rcu_assign_pointer(dev->tx_substream, substream);
} else {
WRITE_ONCE(dev->rx_ptr, 0);
rcu_assign_pointer(dev->rx_substream, substream);
}
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
rcu_assign_pointer(dev->tx_substream, NULL);
else
rcu_assign_pointer(dev->rx_substream, NULL);
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static snd_pcm_uframes_t i2svad_pcm_pointer(struct snd_soc_component *component,
struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct i2svad_dev *dev = runtime->private_data;
snd_pcm_uframes_t pos;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
pos = READ_ONCE(dev->tx_ptr);
else
pos = READ_ONCE(dev->rx_ptr);
return pos < runtime->buffer_size ? pos : 0;
}
static int i2svad_pcm_new(struct snd_soc_component *component,
struct snd_soc_pcm_runtime *rtd)
{
size_t size = i2svad_pcm_hardware.buffer_bytes_max;
snd_pcm_set_managed_buffer_all(rtd->pcm,
SNDRV_DMA_TYPE_CONTINUOUS,
NULL, size, size);
return 0;
}
static const struct snd_soc_component_driver i2svad_pcm_component = {
.open = i2svad_pcm_open,
.close = i2svad_pcm_close,
.hw_params = i2svad_pcm_hw_params,
.trigger = i2svad_pcm_trigger,
.pointer = i2svad_pcm_pointer,
.pcm_construct = i2svad_pcm_new,
};
int i2svad_pcm_register(struct platform_device *pdev)
{
return devm_snd_soc_register_component(&pdev->dev, &i2svad_pcm_component,
NULL, 0);
}
|
