Merge branch 'for-2.6.30' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie...
[pandora-kernel.git] / sound / soc / s3c24xx / s3c2412-i2s.c
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/clk.h>
24 #include <linux/kernel.h>
25 #include <linux/io.h>
26
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>
33
34 #include <plat/regs-s3c2412-iis.h>
35
36 #include <plat/regs-gpio.h>
37 #include <plat/audio.h>
38 #include <mach/dma.h>
39
40 #include "s3c24xx-pcm.h"
41 #include "s3c2412-i2s.h"
42
43 #define S3C2412_I2S_DEBUG 0
44
45 static struct s3c2410_dma_client s3c2412_dma_client_out = {
46         .name           = "I2S PCM Stereo out"
47 };
48
49 static struct s3c2410_dma_client s3c2412_dma_client_in = {
50         .name           = "I2S PCM Stereo in"
51 };
52
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,
57         .dma_size       = 4,
58 };
59
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,
64         .dma_size       = 4,
65 };
66
67 static struct s3c_i2sv2_info s3c2412_i2s;
68
69 /*
70  * Set S3C2412 Clock source
71  */
72 static int s3c2412_i2s_set_sysclk(struct snd_soc_dai *cpu_dai,
73                                   int clk_id, unsigned int freq, int dir)
74 {
75         u32 iismod = readl(s3c2412_i2s.regs + S3C2412_IISMOD);
76
77         pr_debug("%s(%p, %d, %u, %d)\n", __func__, cpu_dai, clk_id,
78             freq, dir);
79
80         switch (clk_id) {
81         case S3C2412_CLKSRC_PCLK:
82                 s3c2412_i2s.master = 1;
83                 iismod &= ~S3C2412_IISMOD_MASTER_MASK;
84                 iismod |= S3C2412_IISMOD_MASTER_INTERNAL;
85                 break;
86         case S3C2412_CLKSRC_I2SCLK:
87                 s3c2412_i2s.master = 0;
88                 iismod &= ~S3C2412_IISMOD_MASTER_MASK;
89                 iismod |= S3C2412_IISMOD_MASTER_EXTERNAL;
90                 break;
91         default:
92                 return -EINVAL;
93         }
94
95         writel(iismod, s3c2412_i2s.regs + S3C2412_IISMOD);
96         return 0;
97 }
98
99
100 struct clk *s3c2412_get_iisclk(void)
101 {
102         return s3c2412_i2s.iis_clk;
103 }
104 EXPORT_SYMBOL_GPL(s3c2412_get_iisclk);
105
106
107 static int s3c2412_i2s_probe(struct platform_device *pdev,
108                              struct snd_soc_dai *dai)
109 {
110         int ret;
111
112         pr_debug("Entered %s\n", __func__);
113
114         ret = s3c_i2sv2_probe(pdev, dai, &s3c2412_i2s, S3C2410_PA_IIS);
115         if (ret)
116                 return ret;
117
118         s3c2412_i2s.dma_capture = &s3c2412_i2s_pcm_stereo_in;
119         s3c2412_i2s.dma_playback = &s3c2412_i2s_pcm_stereo_out;
120
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);
125                 return -ENODEV;
126         }
127
128         /* Set MPLL as the source for IIS CLK */
129
130         clk_set_parent(s3c2412_i2s.iis_cclk, clk_get(NULL, "mpll"));
131         clk_enable(s3c2412_i2s.iis_cclk);
132
133         s3c2412_i2s.iis_cclk = s3c2412_i2s.iis_pclk;
134
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);
141
142         return 0;
143 }
144
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)
149
150 struct snd_soc_dai s3c2412_i2s_dai = {
151         .name           = "s3c2412-i2s",
152         .id             = 0,
153         .probe          = s3c2412_i2s_probe,
154         .playback = {
155                 .channels_min   = 2,
156                 .channels_max   = 2,
157                 .rates          = S3C2412_I2S_RATES,
158                 .formats        = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
159         },
160         .capture = {
161                 .channels_min   = 2,
162                 .channels_max   = 2,
163                 .rates          = S3C2412_I2S_RATES,
164                 .formats        = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
165         },
166         .ops = {
167                 .set_sysclk     = s3c2412_i2s_set_sysclk,
168         },
169 };
170 EXPORT_SYMBOL_GPL(s3c2412_i2s_dai);
171
172 static int __init s3c2412_i2s_init(void)
173 {
174         return  s3c_i2sv2_register_dai(&s3c2412_i2s_dai);
175 }
176 module_init(s3c2412_i2s_init);
177
178 static void __exit s3c2412_i2s_exit(void)
179 {
180         snd_soc_unregister_dai(&s3c2412_i2s_dai);
181 }
182 module_exit(s3c2412_i2s_exit);
183
184 /* Module information */
185 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
186 MODULE_DESCRIPTION("S3C2412 I2S SoC Interface");
187 MODULE_LICENSE("GPL");