summaryrefslogtreecommitdiffstats
path: root/sound/soc/samsung/s3c2412-i2s.c
blob: d45dffb297d8f90d92113e84b2b45b08547f47d4 (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
/* sound/soc/samsung/s3c2412-i2s.c
 *
 * ALSA Soc Audio Layer - S3C2412 I2S driver
 *
 * Copyright (c) 2006 Wolfson Microelectronics PLC.
 *	Graeme Gregory graeme.gregory@wolfsonmicro.com
 *	linux@wolfsonmicro.com
 *
 * Copyright (c) 2007, 2004-2005 Simtec Electronics
 *	http://armlinux.simtec.co.uk/
 *	Ben Dooks <ben@simtec.co.uk>
 *
 * 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.
 */

#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/module.h>

#include <sound/soc.h>
#include <sound/pcm_params.h>

#include <mach/gpio-samsung.h>
#include <plat/gpio-cfg.h>

#include "dma.h"
#include "regs-i2s-v2.h"
#include "s3c2412-i2s.h"

#include <linux/platform_data/asoc-s3c.h>

static struct s3c_dma_params s3c2412_i2s_pcm_stereo_out = {
	.ch_name	= "tx",
	.dma_size	= 4,
};

static struct s3c_dma_params s3c2412_i2s_pcm_stereo_in = {
	.ch_name	= "rx",
	.dma_size	= 4,
};

static struct s3c_i2sv2_info s3c2412_i2s;

static int s3c2412_i2s_probe(struct snd_soc_dai *dai)
{
	int ret;

	pr_debug("Entered %s\n", __func__);

	samsung_asoc_init_dma_data(dai, &s3c2412_i2s_pcm_stereo_out,
		&s3c2412_i2s_pcm_stereo_in);

	ret = s3c_i2sv2_probe(dai, &s3c2412_i2s, S3C2410_PA_IIS);
	if (ret)
		return ret;

	s3c2412_i2s.dma_capture = &s3c2412_i2s_pcm_stereo_in;
	s3c2412_i2s.dma_playback = &s3c2412_i2s_pcm_stereo_out;

	s3c2412_i2s.iis_cclk = devm_clk_get(dai->dev, "i2sclk");
	if (IS_ERR(s3c2412_i2s.iis_cclk)) {
		pr_err("failed to get i2sclk clock\n");
		return PTR_ERR(s3c2412_i2s.iis_cclk);
	}

	/* Set MPLL as the source for IIS CLK */

	clk_set_parent(s3c2412_i2s.iis_cclk, clk_get(NULL, "mpll"));
	clk_prepare_enable(s3c2412_i2s.iis_cclk);

	s3c2412_i2s.iis_cclk = s3c2412_i2s.iis_pclk;

	/* Configure the I2S pins (GPE0...GPE4) in correct mode */
	s3c_gpio_cfgall_range(S3C2410_GPE(0), 5, S3C_GPIO_SFN(2),
			      S3C_GPIO_PULL_NONE);

	return 0;
}

static int s3c2412_i2s_remove(struct snd_soc_dai *dai)
{
	clk_disable_unprepare(s3c2412_i2s.iis_cclk);

	return 0;
}

static int s3c2412_i2s_hw_params(struct snd_pcm_substream *substream,
				 struct snd_pcm_hw_params *params,
				 struct snd_soc_dai *cpu_dai)
{
	struct s3c_i2sv2_info *i2s = snd_soc_dai_get_drvdata(cpu_dai);
	u32 iismod;

	pr_debug("Entered %s\n", __func__);

	iismod = readl(i2s->regs + S3C2412_IISMOD);
	pr_debug("%s: r: IISMOD: %x\n", __func__, iismod);

	switch (params_width(params)) {
	case 8:
		iismod |= S3C2412_IISMOD_8BIT;
		break;
	case 16:
		iismod &= ~S3C2412_IISMOD_8BIT;
		break;
	}

	writel(iismod, i2s->regs + S3C2412_IISMOD);
	pr_debug("%s: w: IISMOD: %x\n", __func__, iismod);

	return 0;
}

#define S3C2412_I2S_RATES \
	(SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
	SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
	SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)

static const struct snd_soc_dai_ops s3c2412_i2s_dai_ops = {
	.hw_params	= s3c2412_i2s_hw_params,
};

static struct snd_soc_dai_driver s3c2412_i2s_dai = {
	.probe		= s3c2412_i2s_probe,
	.remove	= s3c2412_i2s_remove,
	.playback = {
		.channels_min	= 2,
		.channels_max	= 2,
		.rates		= S3C2412_I2S_RATES,
		.formats	= SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
	},
	.capture = {
		.channels_min	= 2,
		.channels_max	= 2,
		.rates		= S3C2412_I2S_RATES,
		.formats	= SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
	},
	.ops = &s3c2412_i2s_dai_ops,
};

static const struct snd_soc_component_driver s3c2412_i2s_component = {
	.name		= "s3c2412-i2s",
};

static int s3c2412_iis_dev_probe(struct platform_device *pdev)
{
	int ret = 0;
	struct resource *res;
	struct s3c_audio_pdata *pdata = dev_get_platdata(&pdev->dev);

	if (!pdata) {
		dev_err(&pdev->dev, "missing platform data");
		return -ENXIO;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	s3c2412_i2s.regs = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(s3c2412_i2s.regs))
		return PTR_ERR(s3c2412_i2s.regs);

	s3c2412_i2s_pcm_stereo_out.dma_addr = res->start + S3C2412_IISTXD;
	s3c2412_i2s_pcm_stereo_out.slave = pdata->dma_playback;
	s3c2412_i2s_pcm_stereo_in.dma_addr = res->start + S3C2412_IISRXD;
	s3c2412_i2s_pcm_stereo_in.slave = pdata->dma_capture;

	ret = s3c_i2sv2_register_component(&pdev->dev, -1,
					   &s3c2412_i2s_component,
					   &s3c2412_i2s_dai);
	if (ret) {
		pr_err("failed to register the dai\n");
		return ret;
	}

	ret = samsung_asoc_dma_platform_register(&pdev->dev,
						 pdata->dma_filter,
						 NULL, NULL);
	if (ret)
		pr_err("failed to register the DMA: %d\n", ret);

	return ret;
}

static struct platform_driver s3c2412_iis_driver = {
	.probe  = s3c2412_iis_dev_probe,
	.driver = {
		.name = "s3c2412-iis",
	},
};

module_platform_driver(s3c2412_iis_driver);

/* Module information */
MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
MODULE_DESCRIPTION("S3C2412 I2S SoC Interface");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:s3c2412-iis");
OpenPOWER on IntegriCloud