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
|
/*
* ALSA SoC SPDIF In Audio Layer for spear processors
*
* Copyright (C) 2012 ST Microelectronics
* Vipin Kumar <vipin.kumar@st.com>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <sound/dmaengine_pcm.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/spear_dma.h>
#include <sound/spear_spdif.h>
#include "spdif_in_regs.h"
#include "spear_pcm.h"
struct spdif_in_params {
u32 format;
};
struct spdif_in_dev {
struct clk *clk;
struct spear_dma_data dma_params;
struct spdif_in_params saved_params;
void *io_base;
struct device *dev;
void (*reset_perip)(void);
int irq;
struct snd_dmaengine_dai_dma_data dma_params_rx;
struct snd_dmaengine_pcm_config config;
};
static void spdif_in_configure(struct spdif_in_dev *host)
{
u32 ctrl = SPDIF_IN_PRTYEN | SPDIF_IN_STATEN | SPDIF_IN_USREN |
SPDIF_IN_VALEN | SPDIF_IN_BLKEN;
ctrl |= SPDIF_MODE_16BIT | SPDIF_FIFO_THRES_16;
writel(ctrl, host->io_base + SPDIF_IN_CTRL);
writel(0xF, host->io_base + SPDIF_IN_IRQ_MASK);
}
static int spdif_in_dai_probe(struct snd_soc_dai *dai)
{
struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai);
host->dma_params_rx.filter_data = &host->dma_params;
dai->capture_dma_data = &host->dma_params_rx;
return 0;
}
static void spdif_in_shutdown(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai);
if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
return;
writel(0x0, host->io_base + SPDIF_IN_IRQ_MASK);
}
static void spdif_in_format(struct spdif_in_dev *host, u32 format)
{
u32 ctrl = readl(host->io_base + SPDIF_IN_CTRL);
switch (format) {
case SNDRV_PCM_FORMAT_S16_LE:
ctrl |= SPDIF_XTRACT_16BIT;
break;
case SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE:
ctrl &= ~SPDIF_XTRACT_16BIT;
break;
}
writel(ctrl, host->io_base + SPDIF_IN_CTRL);
}
static int spdif_in_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai);
u32 format;
if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
return -EINVAL;
format = params_format(params);
host->saved_params.format = format;
return 0;
}
static int spdif_in_trigger(struct snd_pcm_substream *substream, int cmd,
struct snd_soc_dai *dai)
{
struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai);
u32 ctrl;
int ret = 0;
if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
return -EINVAL;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
clk_enable(host->clk);
spdif_in_configure(host);
spdif_in_format(host, host->saved_params.format);
ctrl = readl(host->io_base + SPDIF_IN_CTRL);
ctrl |= SPDIF_IN_SAMPLE | SPDIF_IN_ENB;
writel(ctrl, host->io_base + SPDIF_IN_CTRL);
writel(0xF, host->io_base + SPDIF_IN_IRQ_MASK);
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
ctrl = readl(host->io_base + SPDIF_IN_CTRL);
ctrl &= ~(SPDIF_IN_SAMPLE | SPDIF_IN_ENB);
writel(ctrl, host->io_base + SPDIF_IN_CTRL);
writel(0x0, host->io_base + SPDIF_IN_IRQ_MASK);
if (host->reset_perip)
host->reset_perip();
clk_disable(host->clk);
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static const struct snd_soc_dai_ops spdif_in_dai_ops = {
.shutdown = spdif_in_shutdown,
.trigger = spdif_in_trigger,
.hw_params = spdif_in_hw_params,
};
static struct snd_soc_dai_driver spdif_in_dai = {
.probe = spdif_in_dai_probe,
.capture = {
.channels_min = 2,
.channels_max = 2,
.rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000 | \
SNDRV_PCM_RATE_192000),
.formats = SNDRV_PCM_FMTBIT_S16_LE | \
SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE,
},
.ops = &spdif_in_dai_ops,
};
static const struct snd_soc_component_driver spdif_in_component = {
.name = "spdif-in",
.legacy_dai_naming = 1,
};
static irqreturn_t spdif_in_irq(int irq, void *arg)
{
struct spdif_in_dev *host = (struct spdif_in_dev *)arg;
u32 irq_status = readl(host->io_base + SPDIF_IN_IRQ);
if (!irq_status)
return IRQ_NONE;
if (irq_status & SPDIF_IRQ_FIFOWRITE)
dev_err(host->dev, "spdif in: fifo write error");
if (irq_status & SPDIF_IRQ_EMPTYFIFOREAD)
dev_err(host->dev, "spdif in: empty fifo read error");
if (irq_status & SPDIF_IRQ_FIFOFULL)
dev_err(host->dev, "spdif in: fifo full error");
if (irq_status & SPDIF_IRQ_OUTOFRANGE)
dev_err(host->dev, "spdif in: out of range error");
writel(0, host->io_base + SPDIF_IN_IRQ);
return IRQ_HANDLED;
}
static int spdif_in_probe(struct platform_device *pdev)
{
struct spdif_in_dev *host;
struct spear_spdif_platform_data *pdata;
struct resource *res_fifo;
void __iomem *io_base;
int ret;
io_base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(io_base))
return PTR_ERR(io_base);
res_fifo = platform_get_resource(pdev, IORESOURCE_IO, 0);
if (!res_fifo)
return -EINVAL;
host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
if (!host)
return -ENOMEM;
host->io_base = io_base;
host->irq = platform_get_irq(pdev, 0);
if (host->irq < 0) {
dev_warn(&pdev->dev, "failed to get IRQ: %d\n", host->irq);
return host->irq;
}
host->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(host->clk))
return PTR_ERR(host->clk);
pdata = dev_get_platdata(&pdev->dev);
if (!pdata)
return -EINVAL;
host->dma_params.data = pdata->dma_params;
host->dma_params.addr = res_fifo->start;
host->dma_params.max_burst = 16;
host->dma_params.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
host->reset_perip = pdata->reset_perip;
host->dev = &pdev->dev;
dev_set_drvdata(&pdev->dev, host);
ret = devm_request_irq(&pdev->dev, host->irq, spdif_in_irq, 0,
"spdif-in", host);
if (ret) {
dev_warn(&pdev->dev, "request_irq failed\n");
return ret;
}
ret = devm_snd_soc_register_component(&pdev->dev, &spdif_in_component,
&spdif_in_dai, 1);
if (ret)
return ret;
return devm_spear_pcm_platform_register(&pdev->dev, &host->config,
pdata->filter);
}
static struct platform_driver spdif_in_driver = {
.probe = spdif_in_probe,
.driver = {
.name = "spdif-in",
},
};
module_platform_driver(spdif_in_driver);
MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>");
MODULE_DESCRIPTION("SPEAr SPDIF IN SoC Interface");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:spdif_in");
|
