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
|
// SPDX-License-Identifier: GPL-2.0
//
// Copyright (c) 2020 BayLibre, SAS.
// Author: Jerome Brunet <jbrunet@baylibre.com>
#include <linux/bitfield.h>
#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/soc-dai.h>
#include "aiu-fifo.h"
#define AIU_MEM_START 0x00
#define AIU_MEM_RD 0x04
#define AIU_MEM_END 0x08
#define AIU_MEM_MASKS 0x0c
#define AIU_MEM_MASK_CH_RD GENMASK(7, 0)
#define AIU_MEM_MASK_CH_MEM GENMASK(15, 8)
#define AIU_MEM_CONTROL 0x10
#define AIU_MEM_CONTROL_INIT BIT(0)
#define AIU_MEM_CONTROL_FILL_EN BIT(1)
#define AIU_MEM_CONTROL_EMPTY_EN BIT(2)
static struct snd_soc_dai *aiu_fifo_dai(struct snd_pcm_substream *ss)
{
struct snd_soc_pcm_runtime *rtd = ss->private_data;
return asoc_rtd_to_cpu(rtd, 0);
}
snd_pcm_uframes_t aiu_fifo_pointer(struct snd_soc_component *component,
struct snd_pcm_substream *substream)
{
struct snd_soc_dai *dai = aiu_fifo_dai(substream);
struct aiu_fifo *fifo = dai->playback_dma_data;
struct snd_pcm_runtime *runtime = substream->runtime;
unsigned int addr;
addr = snd_soc_component_read(component, fifo->mem_offset + AIU_MEM_RD);
return bytes_to_frames(runtime, addr - (unsigned int)runtime->dma_addr);
}
static void aiu_fifo_enable(struct snd_soc_dai *dai, bool enable)
{
struct snd_soc_component *component = dai->component;
struct aiu_fifo *fifo = dai->playback_dma_data;
unsigned int en_mask = (AIU_MEM_CONTROL_FILL_EN |
AIU_MEM_CONTROL_EMPTY_EN);
snd_soc_component_update_bits(component,
fifo->mem_offset + AIU_MEM_CONTROL,
en_mask, enable ? en_mask : 0);
}
int aiu_fifo_trigger(struct snd_pcm_substream *substream, int cmd,
struct snd_soc_dai *dai)
{
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
aiu_fifo_enable(dai, true);
break;
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
case SNDRV_PCM_TRIGGER_STOP:
aiu_fifo_enable(dai, false);
break;
default:
return -EINVAL;
}
return 0;
}
int aiu_fifo_prepare(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct snd_soc_component *component = dai->component;
struct aiu_fifo *fifo = dai->playback_dma_data;
snd_soc_component_update_bits(component,
fifo->mem_offset + AIU_MEM_CONTROL,
AIU_MEM_CONTROL_INIT,
AIU_MEM_CONTROL_INIT);
snd_soc_component_update_bits(component,
fifo->mem_offset + AIU_MEM_CONTROL,
AIU_MEM_CONTROL_INIT, 0);
return 0;
}
int aiu_fifo_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_soc_component *component = dai->component;
struct aiu_fifo *fifo = dai->playback_dma_data;
dma_addr_t end;
/* Setup the fifo boundaries */
end = runtime->dma_addr + runtime->dma_bytes - fifo->fifo_block;
snd_soc_component_write(component, fifo->mem_offset + AIU_MEM_START,
runtime->dma_addr);
snd_soc_component_write(component, fifo->mem_offset + AIU_MEM_RD,
runtime->dma_addr);
snd_soc_component_write(component, fifo->mem_offset + AIU_MEM_END,
end);
/* Setup the fifo to read all the memory - no skip */
snd_soc_component_update_bits(component,
fifo->mem_offset + AIU_MEM_MASKS,
AIU_MEM_MASK_CH_RD | AIU_MEM_MASK_CH_MEM,
FIELD_PREP(AIU_MEM_MASK_CH_RD, 0xff) |
FIELD_PREP(AIU_MEM_MASK_CH_MEM, 0xff));
return 0;
}
static irqreturn_t aiu_fifo_isr(int irq, void *dev_id)
{
struct snd_pcm_substream *playback = dev_id;
snd_pcm_period_elapsed(playback);
return IRQ_HANDLED;
}
int aiu_fifo_startup(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct aiu_fifo *fifo = dai->playback_dma_data;
int ret;
snd_soc_set_runtime_hwparams(substream, fifo->pcm);
/*
* Make sure the buffer and period size are multiple of the fifo burst
* size
*/
ret = snd_pcm_hw_constraint_step(substream->runtime, 0,
SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
fifo->fifo_block);
if (ret)
return ret;
ret = snd_pcm_hw_constraint_step(substream->runtime, 0,
SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
fifo->fifo_block);
if (ret)
return ret;
ret = clk_prepare_enable(fifo->pclk);
if (ret)
return ret;
ret = request_irq(fifo->irq, aiu_fifo_isr, 0, dev_name(dai->dev),
substream);
if (ret)
clk_disable_unprepare(fifo->pclk);
return ret;
}
void aiu_fifo_shutdown(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct aiu_fifo *fifo = dai->playback_dma_data;
free_irq(fifo->irq, substream);
clk_disable_unprepare(fifo->pclk);
}
int aiu_fifo_pcm_new(struct snd_soc_pcm_runtime *rtd,
struct snd_soc_dai *dai)
{
struct snd_card *card = rtd->card->snd_card;
struct aiu_fifo *fifo = dai->playback_dma_data;
size_t size = fifo->pcm->buffer_bytes_max;
int ret;
ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
if (ret)
return ret;
snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_DEV,
card->dev, size, size);
return 0;
}
int aiu_fifo_dai_probe(struct snd_soc_dai *dai)
{
struct aiu_fifo *fifo;
fifo = kzalloc(sizeof(*fifo), GFP_KERNEL);
if (!fifo)
return -ENOMEM;
dai->playback_dma_data = fifo;
return 0;
}
int aiu_fifo_dai_remove(struct snd_soc_dai *dai)
{
kfree(dai->playback_dma_data);
return 0;
}
|
