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/clk.h>
24 #include <linux/kernel.h>
27 #include <sound/core.h>
28 #include <sound/pcm.h>
29 #include <sound/pcm_params.h>
30 #include <sound/initval.h>
31 #include <sound/soc.h>
32 #include <mach/hardware.h>
34 #include <plat/regs-s3c2412-iis.h>
36 #include <plat/audio.h>
37 #include <mach/regs-gpio.h>
40 #include "s3c24xx-pcm.h"
41 #include "s3c2412-i2s.h"
43 #define S3C2412_I2S_DEBUG 0
45 static struct s3c2410_dma_client s3c2412_dma_client_out = {
46 .name = "I2S PCM Stereo out"
49 static struct s3c2410_dma_client s3c2412_dma_client_in = {
50 .name = "I2S PCM Stereo in"
53 static struct s3c24xx_pcm_dma_params s3c2412_i2s_pcm_stereo_out = {
54 .client = &s3c2412_dma_client_out,
55 .channel = DMACH_I2S_OUT,
56 .dma_addr = S3C2410_PA_IIS + S3C2412_IISTXD,
60 static struct s3c24xx_pcm_dma_params s3c2412_i2s_pcm_stereo_in = {
61 .client = &s3c2412_dma_client_in,
62 .channel = DMACH_I2S_IN,
63 .dma_addr = S3C2410_PA_IIS + S3C2412_IISRXD,
67 static struct s3c_i2sv2_info s3c2412_i2s;
70 * Set S3C2412 Clock source
72 static int s3c2412_i2s_set_sysclk(struct snd_soc_dai *cpu_dai,
73 int clk_id, unsigned int freq, int dir)
75 u32 iismod = readl(s3c2412_i2s.regs + S3C2412_IISMOD);
77 pr_debug("%s(%p, %d, %u, %d)\n", __func__, cpu_dai, clk_id,
81 case S3C2412_CLKSRC_PCLK:
82 s3c2412_i2s.master = 1;
83 iismod &= ~S3C2412_IISMOD_MASTER_MASK;
84 iismod |= S3C2412_IISMOD_MASTER_INTERNAL;
86 case S3C2412_CLKSRC_I2SCLK:
87 s3c2412_i2s.master = 0;
88 iismod &= ~S3C2412_IISMOD_MASTER_MASK;
89 iismod |= S3C2412_IISMOD_MASTER_EXTERNAL;
95 writel(iismod, s3c2412_i2s.regs + S3C2412_IISMOD);
100 struct clk *s3c2412_get_iisclk(void)
102 return s3c2412_i2s.iis_clk;
104 EXPORT_SYMBOL_GPL(s3c2412_get_iisclk);
107 static int s3c2412_i2s_probe(struct platform_device *pdev,
108 struct snd_soc_dai *dai)
112 pr_debug("Entered %s\n", __func__);
114 ret = s3c_i2sv2_probe(pdev, dai, &s3c2412_i2s, S3C2410_PA_IIS);
118 s3c2412_i2s.dma_capture = &s3c2412_i2s_pcm_stereo_in;
119 s3c2412_i2s.dma_playback = &s3c2412_i2s_pcm_stereo_out;
121 s3c2412_i2s.iis_cclk = clk_get(&pdev->dev, "i2sclk");
122 if (s3c2412_i2s.iis_cclk == NULL) {
123 pr_debug("failed to get i2sclk clock\n");
124 iounmap(s3c2412_i2s.regs);
128 /* Set MPLL as the source for IIS CLK */
130 clk_set_parent(s3c2412_i2s.iis_cclk, clk_get(NULL, "mpll"));
131 clk_enable(s3c2412_i2s.iis_cclk);
133 s3c2412_i2s.iis_cclk = s3c2412_i2s.iis_pclk;
135 /* Configure the I2S pins in correct mode */
136 s3c2410_gpio_cfgpin(S3C2410_GPE0, S3C2410_GPE0_I2SLRCK);
137 s3c2410_gpio_cfgpin(S3C2410_GPE1, S3C2410_GPE1_I2SSCLK);
138 s3c2410_gpio_cfgpin(S3C2410_GPE2, S3C2410_GPE2_CDCLK);
139 s3c2410_gpio_cfgpin(S3C2410_GPE3, S3C2410_GPE3_I2SSDI);
140 s3c2410_gpio_cfgpin(S3C2410_GPE4, S3C2410_GPE4_I2SSDO);
145 #define S3C2412_I2S_RATES \
146 (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
147 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
148 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
150 static struct snd_soc_dai_ops s3c2412_i2s_dai_ops = {
151 .set_sysclk = s3c2412_i2s_set_sysclk,
154 struct snd_soc_dai s3c2412_i2s_dai = {
155 .name = "s3c2412-i2s",
157 .probe = s3c2412_i2s_probe,
161 .rates = S3C2412_I2S_RATES,
162 .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
167 .rates = S3C2412_I2S_RATES,
168 .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
170 .ops = &s3c2412_i2s_dai_ops,
172 EXPORT_SYMBOL_GPL(s3c2412_i2s_dai);
174 static int __init s3c2412_i2s_init(void)
176 return s3c_i2sv2_register_dai(&s3c2412_i2s_dai);
178 module_init(s3c2412_i2s_init);
180 static void __exit s3c2412_i2s_exit(void)
182 snd_soc_unregister_dai(&s3c2412_i2s_dai);
184 module_exit(s3c2412_i2s_exit);
186 /* Module information */
187 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
188 MODULE_DESCRIPTION("S3C2412 I2S SoC Interface");
189 MODULE_LICENSE("GPL");