1 /* sound/soc/s3c24xx/s3c2412-i2s.c
3 * ALSA Soc Audio Layer - S3C2412 I2S driver
5 * Copyright (c) 2006 Wolfson Microelectronics PLC.
6 * Graeme Gregory graeme.gregory@wolfsonmicro.com
7 * linux@wolfsonmicro.com
9 * Copyright (c) 2007, 2004-2005 Simtec Electronics
10 * http://armlinux.simtec.co.uk/
11 * Ben Dooks <ben@simtec.co.uk>
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.
19 #include <linux/init.h>
20 #include <linux/module.h>
21 #include <linux/device.h>
22 #include <linux/delay.h>
23 #include <linux/gpio.h>
24 #include <linux/clk.h>
25 #include <linux/kernel.h>
28 #include <sound/core.h>
29 #include <sound/pcm.h>
30 #include <sound/pcm_params.h>
31 #include <sound/initval.h>
32 #include <sound/soc.h>
33 #include <mach/hardware.h>
35 #include <plat/regs-s3c2412-iis.h>
37 #include <plat/audio.h>
38 #include <mach/regs-gpio.h>
41 #include "s3c24xx-pcm.h"
42 #include "s3c2412-i2s.h"
44 #define S3C2412_I2S_DEBUG 0
46 static struct s3c2410_dma_client s3c2412_dma_client_out = {
47 .name = "I2S PCM Stereo out"
50 static struct s3c2410_dma_client s3c2412_dma_client_in = {
51 .name = "I2S PCM Stereo in"
54 static struct s3c24xx_pcm_dma_params s3c2412_i2s_pcm_stereo_out = {
55 .client = &s3c2412_dma_client_out,
56 .channel = DMACH_I2S_OUT,
57 .dma_addr = S3C2410_PA_IIS + S3C2412_IISTXD,
61 static struct s3c24xx_pcm_dma_params s3c2412_i2s_pcm_stereo_in = {
62 .client = &s3c2412_dma_client_in,
63 .channel = DMACH_I2S_IN,
64 .dma_addr = S3C2410_PA_IIS + S3C2412_IISRXD,
68 static struct s3c_i2sv2_info s3c2412_i2s;
71 * Set S3C2412 Clock source
73 static int s3c2412_i2s_set_sysclk(struct snd_soc_dai *cpu_dai,
74 int clk_id, unsigned int freq, int dir)
76 u32 iismod = readl(s3c2412_i2s.regs + S3C2412_IISMOD);
78 pr_debug("%s(%p, %d, %u, %d)\n", __func__, cpu_dai, clk_id,
82 case S3C2412_CLKSRC_PCLK:
83 s3c2412_i2s.master = 1;
84 iismod &= ~S3C2412_IISMOD_MASTER_MASK;
85 iismod |= S3C2412_IISMOD_MASTER_INTERNAL;
87 case S3C2412_CLKSRC_I2SCLK:
88 s3c2412_i2s.master = 0;
89 iismod &= ~S3C2412_IISMOD_MASTER_MASK;
90 iismod |= S3C2412_IISMOD_MASTER_EXTERNAL;
96 writel(iismod, s3c2412_i2s.regs + S3C2412_IISMOD);
101 struct clk *s3c2412_get_iisclk(void)
103 return s3c2412_i2s.iis_clk;
105 EXPORT_SYMBOL_GPL(s3c2412_get_iisclk);
108 static int s3c2412_i2s_probe(struct platform_device *pdev,
109 struct snd_soc_dai *dai)
113 pr_debug("Entered %s\n", __func__);
115 ret = s3c_i2sv2_probe(pdev, dai, &s3c2412_i2s, S3C2410_PA_IIS);
119 s3c2412_i2s.dma_capture = &s3c2412_i2s_pcm_stereo_in;
120 s3c2412_i2s.dma_playback = &s3c2412_i2s_pcm_stereo_out;
122 s3c2412_i2s.iis_cclk = clk_get(&pdev->dev, "i2sclk");
123 if (s3c2412_i2s.iis_cclk == NULL) {
124 pr_err("failed to get i2sclk clock\n");
125 iounmap(s3c2412_i2s.regs);
129 /* Set MPLL as the source for IIS CLK */
131 clk_set_parent(s3c2412_i2s.iis_cclk, clk_get(NULL, "mpll"));
132 clk_enable(s3c2412_i2s.iis_cclk);
134 s3c2412_i2s.iis_cclk = s3c2412_i2s.iis_pclk;
136 /* Configure the I2S pins in correct mode */
137 s3c2410_gpio_cfgpin(S3C2410_GPE0, S3C2410_GPE0_I2SLRCK);
138 s3c2410_gpio_cfgpin(S3C2410_GPE1, S3C2410_GPE1_I2SSCLK);
139 s3c2410_gpio_cfgpin(S3C2410_GPE2, S3C2410_GPE2_CDCLK);
140 s3c2410_gpio_cfgpin(S3C2410_GPE3, S3C2410_GPE3_I2SSDI);
141 s3c2410_gpio_cfgpin(S3C2410_GPE4, S3C2410_GPE4_I2SSDO);
146 #define S3C2412_I2S_RATES \
147 (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
148 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
149 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
151 static struct snd_soc_dai_ops s3c2412_i2s_dai_ops = {
152 .set_sysclk = s3c2412_i2s_set_sysclk,
155 struct snd_soc_dai s3c2412_i2s_dai = {
156 .name = "s3c2412-i2s",
158 .probe = s3c2412_i2s_probe,
162 .rates = S3C2412_I2S_RATES,
163 .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
168 .rates = S3C2412_I2S_RATES,
169 .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
171 .ops = &s3c2412_i2s_dai_ops,
173 EXPORT_SYMBOL_GPL(s3c2412_i2s_dai);
175 static int __init s3c2412_i2s_init(void)
177 return s3c_i2sv2_register_dai(&s3c2412_i2s_dai);
179 module_init(s3c2412_i2s_init);
181 static void __exit s3c2412_i2s_exit(void)
183 snd_soc_unregister_dai(&s3c2412_i2s_dai);
185 module_exit(s3c2412_i2s_exit);
187 /* Module information */
188 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
189 MODULE_DESCRIPTION("S3C2412 I2S SoC Interface");
190 MODULE_LICENSE("GPL");