1/* sound/soc/samsung/s3c2412-i2s.c
2 *
3 * ALSA Soc Audio Layer - S3C2412 I2S driver
4 *
5 * Copyright (c) 2006 Wolfson Microelectronics PLC.
6 *	Graeme Gregory graeme.gregory@wolfsonmicro.com
7 *	linux@wolfsonmicro.com
8 *
9 * Copyright (c) 2007, 2004-2005 Simtec Electronics
10 *	http://armlinux.simtec.co.uk/
11 *	Ben Dooks <ben@simtec.co.uk>
12 *
13 * This program is free software; you can redistribute  it and/or modify it
14 * under  the terms of  the GNU General  Public License as published by the
15 * Free Software Foundation;  either version 2 of the  License, or (at your
16 * option) any later version.
17 */
18
19#include <linux/delay.h>
20#include <linux/gpio.h>
21#include <linux/clk.h>
22#include <linux/io.h>
23#include <linux/module.h>
24
25#include <sound/soc.h>
26#include <sound/pcm_params.h>
27
28#include <mach/dma.h>
29#include <mach/gpio-samsung.h>
30#include <plat/gpio-cfg.h>
31
32#include "dma.h"
33#include "regs-i2s-v2.h"
34#include "s3c2412-i2s.h"
35
36static struct s3c_dma_params s3c2412_i2s_pcm_stereo_out = {
37	.slave		= (void *)(uintptr_t)DMACH_I2S_OUT,
38	.ch_name	= "tx",
39	.dma_size	= 4,
40};
41
42static struct s3c_dma_params s3c2412_i2s_pcm_stereo_in = {
43	.slave		= (void *)(uintptr_t)DMACH_I2S_IN,
44	.ch_name	= "rx",
45	.dma_size	= 4,
46};
47
48static struct s3c_i2sv2_info s3c2412_i2s;
49
50static int s3c2412_i2s_probe(struct snd_soc_dai *dai)
51{
52	int ret;
53
54	pr_debug("Entered %s\n", __func__);
55
56	samsung_asoc_init_dma_data(dai, &s3c2412_i2s_pcm_stereo_out,
57		&s3c2412_i2s_pcm_stereo_in);
58
59	ret = s3c_i2sv2_probe(dai, &s3c2412_i2s, S3C2410_PA_IIS);
60	if (ret)
61		return ret;
62
63	s3c2412_i2s.dma_capture = &s3c2412_i2s_pcm_stereo_in;
64	s3c2412_i2s.dma_playback = &s3c2412_i2s_pcm_stereo_out;
65
66	s3c2412_i2s.iis_cclk = devm_clk_get(dai->dev, "i2sclk");
67	if (IS_ERR(s3c2412_i2s.iis_cclk)) {
68		pr_err("failed to get i2sclk clock\n");
69		return PTR_ERR(s3c2412_i2s.iis_cclk);
70	}
71
72	/* Set MPLL as the source for IIS CLK */
73
74	clk_set_parent(s3c2412_i2s.iis_cclk, clk_get(NULL, "mpll"));
75	clk_prepare_enable(s3c2412_i2s.iis_cclk);
76
77	s3c2412_i2s.iis_cclk = s3c2412_i2s.iis_pclk;
78
79	/* Configure the I2S pins (GPE0...GPE4) in correct mode */
80	s3c_gpio_cfgall_range(S3C2410_GPE(0), 5, S3C_GPIO_SFN(2),
81			      S3C_GPIO_PULL_NONE);
82
83	return 0;
84}
85
86static int s3c2412_i2s_remove(struct snd_soc_dai *dai)
87{
88	clk_disable_unprepare(s3c2412_i2s.iis_cclk);
89
90	return 0;
91}
92
93static int s3c2412_i2s_hw_params(struct snd_pcm_substream *substream,
94				 struct snd_pcm_hw_params *params,
95				 struct snd_soc_dai *cpu_dai)
96{
97	struct s3c_i2sv2_info *i2s = snd_soc_dai_get_drvdata(cpu_dai);
98	u32 iismod;
99
100	pr_debug("Entered %s\n", __func__);
101
102	iismod = readl(i2s->regs + S3C2412_IISMOD);
103	pr_debug("%s: r: IISMOD: %x\n", __func__, iismod);
104
105	switch (params_width(params)) {
106	case 8:
107		iismod |= S3C2412_IISMOD_8BIT;
108		break;
109	case 16:
110		iismod &= ~S3C2412_IISMOD_8BIT;
111		break;
112	}
113
114	writel(iismod, i2s->regs + S3C2412_IISMOD);
115	pr_debug("%s: w: IISMOD: %x\n", __func__, iismod);
116
117	return 0;
118}
119
120#define S3C2412_I2S_RATES \
121	(SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
122	SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
123	SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
124
125static const struct snd_soc_dai_ops s3c2412_i2s_dai_ops = {
126	.hw_params	= s3c2412_i2s_hw_params,
127};
128
129static struct snd_soc_dai_driver s3c2412_i2s_dai = {
130	.probe		= s3c2412_i2s_probe,
131	.remove	= s3c2412_i2s_remove,
132	.playback = {
133		.channels_min	= 2,
134		.channels_max	= 2,
135		.rates		= S3C2412_I2S_RATES,
136		.formats	= SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
137	},
138	.capture = {
139		.channels_min	= 2,
140		.channels_max	= 2,
141		.rates		= S3C2412_I2S_RATES,
142		.formats	= SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
143	},
144	.ops = &s3c2412_i2s_dai_ops,
145};
146
147static const struct snd_soc_component_driver s3c2412_i2s_component = {
148	.name		= "s3c2412-i2s",
149};
150
151static int s3c2412_iis_dev_probe(struct platform_device *pdev)
152{
153	int ret = 0;
154	struct resource *res;
155
156	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
157	s3c2412_i2s.regs = devm_ioremap_resource(&pdev->dev, res);
158	if (IS_ERR(s3c2412_i2s.regs))
159		return PTR_ERR(s3c2412_i2s.regs);
160
161	s3c2412_i2s_pcm_stereo_out.dma_addr = res->start + S3C2412_IISTXD;
162	s3c2412_i2s_pcm_stereo_in.dma_addr = res->start + S3C2412_IISRXD;
163
164	ret = s3c_i2sv2_register_component(&pdev->dev, -1,
165					   &s3c2412_i2s_component,
166					   &s3c2412_i2s_dai);
167	if (ret) {
168		pr_err("failed to register the dai\n");
169		return ret;
170	}
171
172	ret = samsung_asoc_dma_platform_register(&pdev->dev);
173	if (ret)
174		pr_err("failed to register the DMA: %d\n", ret);
175
176	return ret;
177}
178
179static struct platform_driver s3c2412_iis_driver = {
180	.probe  = s3c2412_iis_dev_probe,
181	.driver = {
182		.name = "s3c2412-iis",
183	},
184};
185
186module_platform_driver(s3c2412_iis_driver);
187
188/* Module information */
189MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
190MODULE_DESCRIPTION("S3C2412 I2S SoC Interface");
191MODULE_LICENSE("GPL");
192MODULE_ALIAS("platform:s3c2412-iis");
193