aboutsummaryrefslogtreecommitdiff
path: root/sound/soc/davinci/davinci-vcif.c
blob: 9d2afccc3a2d645dceb1e263ef7158f4c7667934 (plain)
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
/*
 * ALSA SoC Voice Codec Interface for TI DAVINCI processor
 *
 * Copyright (C) 2010 Texas Instruments.
 *
 * Author: Miguel Aguilar <miguel.aguilar@ridgerun.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/mfd/davinci_voicecodec.h>

#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/initval.h>
#include <sound/soc.h>

#include "davinci-pcm.h"
#include "davinci-i2s.h"

#define MOD_REG_BIT(val, mask, set) do { \
	if (set) { \
		val |= mask; \
	} else { \
		val &= ~mask; \
	} \
} while (0)

struct davinci_vcif_dev {
	struct davinci_vc *davinci_vc;
	struct davinci_pcm_dma_params	dma_params[2];
};

static void davinci_vcif_start(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct davinci_vcif_dev *davinci_vcif_dev =
			snd_soc_dai_get_drvdata(rtd->cpu_dai);
	struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
	u32 w;

	/* Start the sample generator and enable transmitter/receiver */
	w = readl(davinci_vc->base + DAVINCI_VC_CTRL);

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTDAC, 1);
	else
		MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTADC, 1);

	writel(w, davinci_vc->base + DAVINCI_VC_CTRL);
}

static void davinci_vcif_stop(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct davinci_vcif_dev *davinci_vcif_dev =
			snd_soc_dai_get_drvdata(rtd->cpu_dai);
	struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
	u32 w;

	/* Reset transmitter/receiver and sample rate/frame sync generators */
	w = readl(davinci_vc->base + DAVINCI_VC_CTRL);
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTDAC, 0);
	else
		MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTADC, 0);

	writel(w, davinci_vc->base + DAVINCI_VC_CTRL);
}

static int davinci_vcif_hw_params(struct snd_pcm_substream *substream,
				  struct snd_pcm_hw_params *params,
				  struct snd_soc_dai *dai)
{
	struct davinci_vcif_dev *davinci_vcif_dev = snd_soc_dai_get_drvdata(dai);
	struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
	struct davinci_pcm_dma_params *dma_params =
			&davinci_vcif_dev->dma_params[substream->stream];
	u32 w;

	/* Restart the codec before setup */
	davinci_vcif_stop(substream);
	davinci_vcif_start(substream);

	/* General line settings */
	writel(DAVINCI_VC_CTRL_MASK, davinci_vc->base + DAVINCI_VC_CTRL);

	writel(DAVINCI_VC_INT_MASK, davinci_vc->base + DAVINCI_VC_INTCLR);

	writel(DAVINCI_VC_INT_MASK, davinci_vc->base + DAVINCI_VC_INTEN);

	w = readl(davinci_vc->base + DAVINCI_VC_CTRL);

	/* Determine xfer data type */
	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_U8:
		dma_params->data_type = 0;

		MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_BITS_8 |
			    DAVINCI_VC_CTRL_RD_UNSIGNED |
			    DAVINCI_VC_CTRL_WD_BITS_8 |
			    DAVINCI_VC_CTRL_WD_UNSIGNED, 1);
		break;
	case SNDRV_PCM_FORMAT_S8:
		dma_params->data_type = 1;

		MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_BITS_8 |
			    DAVINCI_VC_CTRL_WD_BITS_8, 1);

		MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_UNSIGNED |
			    DAVINCI_VC_CTRL_WD_UNSIGNED, 0);
		break;
	case SNDRV_PCM_FORMAT_S16_LE:
		dma_params->data_type = 2;

		MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_BITS_8 |
			    DAVINCI_VC_CTRL_RD_UNSIGNED |
			    DAVINCI_VC_CTRL_WD_BITS_8 |
			    DAVINCI_VC_CTRL_WD_UNSIGNED, 0);
		break;
	default:
		printk(KERN_WARNING "davinci-vcif: unsupported PCM format");
		return -EINVAL;
	}

	dma_params->acnt  = dma_params->data_type;

	writel(w, davinci_vc->base + DAVINCI_VC_CTRL);

	return 0;
}

static int davinci_vcif_trigger(struct snd_pcm_substream *substream, int cmd,
				struct snd_soc_dai *dai)
{
	int ret = 0;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		davinci_vcif_start(substream);
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		davinci_vcif_stop(substream);
		break;
	default:
		ret = -EINVAL;
	}

	return ret;
}

static int davinci_vcif_startup(struct snd_pcm_substream *substream,
				struct snd_soc_dai *dai)
{
	struct davinci_vcif_dev *dev = snd_soc_dai_get_drvdata(dai);

	snd_soc_dai_set_dma_data(dai, substream, dev->dma_params);
	return 0;
}

#define DAVINCI_VCIF_RATES	SNDRV_PCM_RATE_8000_48000

static struct snd_soc_dai_ops davinci_vcif_dai_ops = {
	.startup	= davinci_vcif_startup,
	.trigger	= davinci_vcif_trigger,
	.hw_params	= davinci_vcif_hw_params,
};

static struct snd_soc_dai_driver davinci_vcif_dai = {
	.playback = {
		.channels_min = 1,
		.channels_max = 2,
		.rates = DAVINCI_VCIF_RATES,
		.formats = SNDRV_PCM_FMTBIT_S16_LE,},
	.capture = {
		.channels_min = 1,
		.channels_max = 2,
		.rates = DAVINCI_VCIF_RATES,
		.formats = SNDRV_PCM_FMTBIT_S16_LE,},
	.ops = &davinci_vcif_dai_ops,

};

static int davinci_vcif_probe(struct platform_device *pdev)
{
	struct davinci_vc *davinci_vc = platform_get_drvdata(pdev);
	struct davinci_vcif_dev *davinci_vcif_dev;
	int ret;

	davinci_vcif_dev = kzalloc(sizeof(struct davinci_vcif_dev), GFP_KERNEL);
	if (!davinci_vcif_dev) {
		dev_dbg(&pdev->dev,
			"could not allocate memory for private data\n");
		return -ENOMEM;
	}

	/* DMA tx params */
	davinci_vcif_dev->davinci_vc = davinci_vc;
	davinci_vcif_dev->dma_params[SNDRV_PCM_STREAM_PLAYBACK].channel =
					davinci_vc->davinci_vcif.dma_tx_channel;
	davinci_vcif_dev->dma_params[SNDRV_PCM_STREAM_PLAYBACK].dma_addr =
					davinci_vc->davinci_vcif.dma_tx_addr;

	/* DMA rx params */
	davinci_vcif_dev->dma_params[SNDRV_PCM_STREAM_CAPTURE].channel =
					davinci_vc->davinci_vcif.dma_rx_channel;
	davinci_vcif_dev->dma_params[SNDRV_PCM_STREAM_CAPTURE].dma_addr =
					davinci_vc->davinci_vcif.dma_rx_addr;

	dev_set_drvdata(&pdev->dev, davinci_vcif_dev);

	ret = snd_soc_register_dai(&pdev->dev, &davinci_vcif_dai);
	if (ret != 0) {
		dev_err(&pdev->dev, "could not register dai\n");
		goto fail;
	}

	return 0;

fail:
	kfree(davinci_vcif_dev);

	return ret;
}

static int davinci_vcif_remove(struct platform_device *pdev)
{
	struct davinci_vcif_dev *davinci_vcif_dev = dev_get_drvdata(&pdev->dev);

	snd_soc_unregister_dai(&pdev->dev);
	kfree(davinci_vcif_dev);

	return 0;
}

static struct platform_driver davinci_vcif_driver = {
	.probe		= davinci_vcif_probe,
	.remove		= davinci_vcif_remove,
	.driver		= {
		.name	= "davinci-vcif",
		.owner	= THIS_MODULE,
	},
};

static int __init davinci_vcif_init(void)
{
	return platform_driver_probe(&davinci_vcif_driver, davinci_vcif_probe);
}
module_init(davinci_vcif_init);

static void __exit davinci_vcif_exit(void)
{
	platform_driver_unregister(&davinci_vcif_driver);
}
module_exit(davinci_vcif_exit);

MODULE_AUTHOR("Miguel Aguilar");
MODULE_DESCRIPTION("Texas Instruments DaVinci ASoC Voice Codec Interface");
MODULE_LICENSE("GPL");