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/regs-gpio.h>
37 #include <plat/audio.h>
40 #include "s3c24xx-pcm.h"
41 #include "s3c2412-i2s.h"
43 #define S3C2412_I2S_DEBUG 0
46 #define DBG(x...) printk(KERN_INFO x)
48 #define DBG(x...) do { } while (0)
51 static struct s3c2410_dma_client s3c2412_dma_client_out = {
52 .name = "I2S PCM Stereo out"
55 static struct s3c2410_dma_client s3c2412_dma_client_in = {
56 .name = "I2S PCM Stereo in"
59 static struct s3c24xx_pcm_dma_params s3c2412_i2s_pcm_stereo_out = {
60 .client = &s3c2412_dma_client_out,
61 .channel = DMACH_I2S_OUT,
62 .dma_addr = S3C2410_PA_IIS + S3C2412_IISTXD,
66 static struct s3c24xx_pcm_dma_params s3c2412_i2s_pcm_stereo_in = {
67 .client = &s3c2412_dma_client_in,
68 .channel = DMACH_I2S_IN,
69 .dma_addr = S3C2410_PA_IIS + S3C2412_IISRXD,
73 static struct s3c_i2sv2_info s3c2412_i2s;
76 * Set S3C2412 Clock source
78 static int s3c2412_i2s_set_sysclk(struct snd_soc_dai *cpu_dai,
79 int clk_id, unsigned int freq, int dir)
81 u32 iismod = readl(s3c2412_i2s.regs + S3C2412_IISMOD);
83 DBG("%s(%p, %d, %u, %d)\n", __func__, cpu_dai, clk_id,
87 case S3C2412_CLKSRC_PCLK:
88 s3c2412_i2s.master = 1;
89 iismod &= ~S3C2412_IISMOD_MASTER_MASK;
90 iismod |= S3C2412_IISMOD_MASTER_INTERNAL;
92 case S3C2412_CLKSRC_I2SCLK:
93 s3c2412_i2s.master = 0;
94 iismod &= ~S3C2412_IISMOD_MASTER_MASK;
95 iismod |= S3C2412_IISMOD_MASTER_EXTERNAL;
101 writel(iismod, s3c2412_i2s.regs + S3C2412_IISMOD);
106 struct clk *s3c2412_get_iisclk(void)
108 return s3c2412_i2s.iis_clk;
110 EXPORT_SYMBOL_GPL(s3c2412_get_iisclk);
113 static int s3c2412_i2s_probe(struct platform_device *pdev,
114 struct snd_soc_dai *dai)
118 DBG("Entered %s\n", __func__);
120 ret = s3c_i2sv2_probe(pdev, dai, &s3c2412_i2s, S3C2410_PA_IIS);
124 s3c2412_i2s.dma_capture = &s3c2412_i2s_pcm_stereo_in;
125 s3c2412_i2s.dma_playback = &s3c2412_i2s_pcm_stereo_out;
127 s3c2412_i2s.iis_cclk = clk_get(&pdev->dev, "i2sclk");
128 if (s3c2412_i2s.iis_cclk == NULL) {
129 DBG("failed to get i2sclk clock\n");
130 iounmap(s3c2412_i2s.regs);
134 /* Set MPLL as the source for IIS CLK */
136 clk_set_parent(s3c2412_i2s.iis_cclk, clk_get(NULL, "mpll"));
137 clk_enable(s3c2412_i2s.iis_cclk);
139 s3c2412_i2s.iis_cclk = s3c2412_i2s.iis_pclk;
141 /* Configure the I2S pins in correct mode */
142 s3c2410_gpio_cfgpin(S3C2410_GPE0, S3C2410_GPE0_I2SLRCK);
143 s3c2410_gpio_cfgpin(S3C2410_GPE1, S3C2410_GPE1_I2SSCLK);
144 s3c2410_gpio_cfgpin(S3C2410_GPE2, S3C2410_GPE2_CDCLK);
145 s3c2410_gpio_cfgpin(S3C2410_GPE3, S3C2410_GPE3_I2SSDI);
146 s3c2410_gpio_cfgpin(S3C2410_GPE4, S3C2410_GPE4_I2SSDO);
151 #define S3C2412_I2S_RATES \
152 (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
153 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
154 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
156 struct snd_soc_dai s3c2412_i2s_dai = {
157 .name = "s3c2412-i2s",
159 .probe = s3c2412_i2s_probe,
163 .rates = S3C2412_I2S_RATES,
164 .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
169 .rates = S3C2412_I2S_RATES,
170 .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
173 .set_sysclk = s3c2412_i2s_set_sysclk,
176 EXPORT_SYMBOL_GPL(s3c2412_i2s_dai);
178 static int __init s3c2412_i2s_init(void)
180 return s3c_i2sv2_register_dai(&s3c2412_i2s_dai);
182 module_init(s3c2412_i2s_init);
184 static void __exit s3c2412_i2s_exit(void)
186 snd_soc_unregister_dai(&s3c2412_i2s_dai);
188 module_exit(s3c2412_i2s_exit);
190 /* Module information */
191 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
192 MODULE_DESCRIPTION("S3C2412 I2S SoC Interface");
193 MODULE_LICENSE("GPL");