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 <mach/regs-gpio.h>
39 #include "regs-i2s-v2.h"
40 #include "s3c2412-i2s.h"
42 #define S3C2412_I2S_DEBUG 0
44 static struct s3c2410_dma_client s3c2412_dma_client_out = {
45 .name = "I2S PCM Stereo out"
48 static struct s3c2410_dma_client s3c2412_dma_client_in = {
49 .name = "I2S PCM Stereo in"
52 static struct s3c_dma_params s3c2412_i2s_pcm_stereo_out = {
53 .client = &s3c2412_dma_client_out,
54 .channel = DMACH_I2S_OUT,
55 .dma_addr = S3C2410_PA_IIS + S3C2412_IISTXD,
59 static struct s3c_dma_params s3c2412_i2s_pcm_stereo_in = {
60 .client = &s3c2412_dma_client_in,
61 .channel = DMACH_I2S_IN,
62 .dma_addr = S3C2410_PA_IIS + S3C2412_IISRXD,
66 static struct s3c_i2sv2_info s3c2412_i2s;
69 * Set S3C2412 Clock source
71 static int s3c2412_i2s_set_sysclk(struct snd_soc_dai *cpu_dai,
72 int clk_id, unsigned int freq, int dir)
74 u32 iismod = readl(s3c2412_i2s.regs + S3C2412_IISMOD);
76 pr_debug("%s(%p, %d, %u, %d)\n", __func__, cpu_dai, clk_id,
80 case S3C2412_CLKSRC_PCLK:
81 iismod &= ~S3C2412_IISMOD_IMS_SYSMUX;
83 case S3C2412_CLKSRC_I2SCLK:
84 iismod |= S3C2412_IISMOD_IMS_SYSMUX;
90 writel(iismod, s3c2412_i2s.regs + S3C2412_IISMOD);
94 static inline struct s3c_i2sv2_info *to_info(struct snd_soc_dai *cpu_dai)
96 return cpu_dai->private_data;
99 static int s3c2412_i2s_probe(struct platform_device *pdev,
100 struct snd_soc_dai *dai)
104 pr_debug("Entered %s\n", __func__);
106 ret = s3c_i2sv2_probe(pdev, dai, &s3c2412_i2s, S3C2410_PA_IIS);
110 s3c2412_i2s.dma_capture = &s3c2412_i2s_pcm_stereo_in;
111 s3c2412_i2s.dma_playback = &s3c2412_i2s_pcm_stereo_out;
113 s3c2412_i2s.iis_cclk = clk_get(&pdev->dev, "i2sclk");
114 if (s3c2412_i2s.iis_cclk == NULL) {
115 pr_err("failed to get i2sclk clock\n");
116 iounmap(s3c2412_i2s.regs);
120 /* Set MPLL as the source for IIS CLK */
122 clk_set_parent(s3c2412_i2s.iis_cclk, clk_get(NULL, "mpll"));
123 clk_enable(s3c2412_i2s.iis_cclk);
125 s3c2412_i2s.iis_cclk = s3c2412_i2s.iis_pclk;
127 /* Configure the I2S pins in correct mode */
128 s3c2410_gpio_cfgpin(S3C2410_GPE0, S3C2410_GPE0_I2SLRCK);
129 s3c2410_gpio_cfgpin(S3C2410_GPE1, S3C2410_GPE1_I2SSCLK);
130 s3c2410_gpio_cfgpin(S3C2410_GPE2, S3C2410_GPE2_CDCLK);
131 s3c2410_gpio_cfgpin(S3C2410_GPE3, S3C2410_GPE3_I2SSDI);
132 s3c2410_gpio_cfgpin(S3C2410_GPE4, S3C2410_GPE4_I2SSDO);
137 static int s3c2412_i2s_hw_params(struct snd_pcm_substream *substream,
138 struct snd_pcm_hw_params *params,
139 struct snd_soc_dai *cpu_dai)
141 struct s3c_i2sv2_info *i2s = to_info(cpu_dai);
142 struct s3c_dma_params *dma_data;
145 pr_debug("Entered %s\n", __func__);
147 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
148 dma_data = i2s->dma_playback;
150 dma_data = i2s->dma_capture;
152 snd_soc_dai_set_dma_data(cpu_dai, substream, dma_data);
154 iismod = readl(i2s->regs + S3C2412_IISMOD);
155 pr_debug("%s: r: IISMOD: %x\n", __func__, iismod);
157 switch (params_format(params)) {
158 case SNDRV_PCM_FORMAT_S8:
159 iismod |= S3C2412_IISMOD_8BIT;
161 case SNDRV_PCM_FORMAT_S16_LE:
162 iismod &= ~S3C2412_IISMOD_8BIT;
166 writel(iismod, i2s->regs + S3C2412_IISMOD);
167 pr_debug("%s: w: IISMOD: %x\n", __func__, iismod);
172 #define S3C2412_I2S_RATES \
173 (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
174 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
175 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
177 static struct snd_soc_dai_ops s3c2412_i2s_dai_ops = {
178 .set_sysclk = s3c2412_i2s_set_sysclk,
179 .hw_params = s3c2412_i2s_hw_params,
182 struct snd_soc_dai s3c2412_i2s_dai = {
183 .name = "s3c2412-i2s",
185 .probe = s3c2412_i2s_probe,
189 .rates = S3C2412_I2S_RATES,
190 .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
195 .rates = S3C2412_I2S_RATES,
196 .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
198 .ops = &s3c2412_i2s_dai_ops,
200 EXPORT_SYMBOL_GPL(s3c2412_i2s_dai);
202 static int __init s3c2412_i2s_init(void)
204 return s3c_i2sv2_register_dai(&s3c2412_i2s_dai);
206 module_init(s3c2412_i2s_init);
208 static void __exit s3c2412_i2s_exit(void)
210 snd_soc_unregister_dai(&s3c2412_i2s_dai);
212 module_exit(s3c2412_i2s_exit);
214 /* Module information */
215 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
216 MODULE_DESCRIPTION("S3C2412 I2S SoC Interface");
217 MODULE_LICENSE("GPL");