1 /* sound/soc/s3c24xx/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/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>
26 #include <linux/io.h>
27
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>
34
35 #include <plat/regs-s3c2412-iis.h>
36
37 #include <plat/audio.h>
38 #include <mach/regs-gpio.h>
39 #include <mach/dma.h>
40
41 #include "s3c24xx-pcm.h"
42 #include "s3c2412-i2s.h"
43
44 #define S3C2412_I2S_DEBUG 0
45
46 static struct s3c2410_dma_client s3c2412_dma_client_out = {
47 .name = "I2S PCM Stereo out"
48 };
49
50 static struct s3c2410_dma_client s3c2412_dma_client_in = {
51 .name = "I2S PCM Stereo in"
52 };
53
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,
58 .dma_size = 4,
59 };
60
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,
65 .dma_size = 4,
66 };
67
68 static struct s3c_i2sv2_info s3c2412_i2s;
69
70 /*
71 * Set S3C2412 Clock source
72 */
73 static int s3c2412_i2s_set_sysclk(struct snd_soc_dai *cpu_dai,
74 int clk_id, unsigned int freq, int dir)
75 {
76 u32 iismod = readl(s3c2412_i2s.regs + S3C2412_IISMOD);
77
78 pr_debug("%s(%p, %d, %u, %d)\n", __func__, cpu_dai, clk_id,
79 freq, dir);
80
81 switch (clk_id) {
82 case S3C2412_CLKSRC_PCLK:
83 s3c2412_i2s.master = 1;
84 iismod &= ~S3C2412_IISMOD_MASTER_MASK;
85 iismod |= S3C2412_IISMOD_MASTER_INTERNAL;
86 break;
87 case S3C2412_CLKSRC_I2SCLK:
88 s3c2412_i2s.master = 0;
89 iismod &= ~S3C2412_IISMOD_MASTER_MASK;
90 iismod |= S3C2412_IISMOD_MASTER_EXTERNAL;
91 break;
92 default:
93 return -EINVAL;
94 }
95
96 writel(iismod, s3c2412_i2s.regs + S3C2412_IISMOD);
97 return 0;
98 }
99
100
101 struct clk *s3c2412_get_iisclk(void)
102 {
103 return s3c2412_i2s.iis_clk;
104 }
105 EXPORT_SYMBOL_GPL(s3c2412_get_iisclk);
106
107
108 static int s3c2412_i2s_probe(struct platform_device *pdev,
109 struct snd_soc_dai *dai)
110 {
111 int ret;
112
113 pr_debug("Entered %s\n", __func__);
114
115 ret = s3c_i2sv2_probe(pdev, dai, &s3c2412_i2s, S3C2410_PA_IIS);
116 if (ret)
117 return ret;
118
119 s3c2412_i2s.dma_capture = &s3c2412_i2s_pcm_stereo_in;
120 s3c2412_i2s.dma_playback = &s3c2412_i2s_pcm_stereo_out;
121
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);
126 return -ENODEV;
127 }
128
129 /* Set MPLL as the source for IIS CLK */
130
131 clk_set_parent(s3c2412_i2s.iis_cclk, clk_get(NULL, "mpll"));
132 clk_enable(s3c2412_i2s.iis_cclk);
133
134 s3c2412_i2s.iis_cclk = s3c2412_i2s.iis_pclk;
135
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);
142
143 return 0;
144 }
145
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)
150
151 static struct snd_soc_dai_ops s3c2412_i2s_dai_ops = {
152 .set_sysclk = s3c2412_i2s_set_sysclk,
153 };
154
155 struct snd_soc_dai s3c2412_i2s_dai = {
156 .name = "s3c2412-i2s",
157 .id = 0,
158 .probe = s3c2412_i2s_probe,
159 .playback = {
160 .channels_min = 2,
161 .channels_max = 2,
162 .rates = S3C2412_I2S_RATES,
163 .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
164 },
165 .capture = {
166 .channels_min = 2,
167 .channels_max = 2,
168 .rates = S3C2412_I2S_RATES,
169 .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
170 },
171 .ops = &s3c2412_i2s_dai_ops,
172 };
173 EXPORT_SYMBOL_GPL(s3c2412_i2s_dai);
174
175 static int __init s3c2412_i2s_init(void)
176 {
177 return s3c_i2sv2_register_dai(&s3c2412_i2s_dai);
178 }
179 module_init(s3c2412_i2s_init);
180
181 static void __exit s3c2412_i2s_exit(void)
182 {
183 snd_soc_unregister_dai(&s3c2412_i2s_dai);
184 }
185 module_exit(s3c2412_i2s_exit);
186
187 /* Module information */
188 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
189 MODULE_DESCRIPTION("S3C2412 I2S SoC Interface");
190 MODULE_LICENSE("GPL");
191
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