ce2daacc4eb97a028e006849e98d143385acf503
[linux-2.6.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/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 <mach/regs-gpio.h>
36 #include <mach/dma.h>
37
38 #include "s3c-dma.h"
39 #include "regs-i2s-v2.h"
40 #include "s3c2412-i2s.h"
41
42 #define S3C2412_I2S_DEBUG 0
43
44 static struct s3c2410_dma_client s3c2412_dma_client_out = {
45         .name           = "I2S PCM Stereo out"
46 };
47
48 static struct s3c2410_dma_client s3c2412_dma_client_in = {
49         .name           = "I2S PCM Stereo in"
50 };
51
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,
56         .dma_size       = 4,
57 };
58
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,
63         .dma_size       = 4,
64 };
65
66 static struct s3c_i2sv2_info s3c2412_i2s;
67
68 /*
69  * Set S3C2412 Clock source
70  */
71 static int s3c2412_i2s_set_sysclk(struct snd_soc_dai *cpu_dai,
72                                   int clk_id, unsigned int freq, int dir)
73 {
74         u32 iismod = readl(s3c2412_i2s.regs + S3C2412_IISMOD);
75
76         pr_debug("%s(%p, %d, %u, %d)\n", __func__, cpu_dai, clk_id,
77             freq, dir);
78
79         switch (clk_id) {
80         case S3C2412_CLKSRC_PCLK:
81                 iismod &= ~S3C2412_IISMOD_IMS_SYSMUX;
82                 break;
83         case S3C2412_CLKSRC_I2SCLK:
84                 iismod |= S3C2412_IISMOD_IMS_SYSMUX;
85                 break;
86         default:
87                 return -EINVAL;
88         }
89
90         writel(iismod, s3c2412_i2s.regs + S3C2412_IISMOD);
91         return 0;
92 }
93
94
95 struct clk *s3c2412_get_iisclk(void)
96 {
97         struct s3c_i2sv2_info *i2s = &s3c2412_i2s;
98         u32 iismod = readl(i2s->regs + S3C2412_IISMOD);
99
100         if (iismod & S3C2412_IISMOD_IMS_SYSMUX)
101                 return i2s->iis_cclk;
102         else
103                 return i2s->iis_pclk;
104 }
105 EXPORT_SYMBOL_GPL(s3c2412_get_iisclk);
106
107 static inline struct s3c_i2sv2_info *to_info(struct snd_soc_dai *cpu_dai)
108 {
109         return cpu_dai->private_data;
110 }
111
112 static int s3c2412_i2s_probe(struct platform_device *pdev,
113                              struct snd_soc_dai *dai)
114 {
115         int ret;
116
117         pr_debug("Entered %s\n", __func__);
118
119         ret = s3c_i2sv2_probe(pdev, dai, &s3c2412_i2s, S3C2410_PA_IIS);
120         if (ret)
121                 return ret;
122
123         s3c2412_i2s.dma_capture = &s3c2412_i2s_pcm_stereo_in;
124         s3c2412_i2s.dma_playback = &s3c2412_i2s_pcm_stereo_out;
125
126         s3c2412_i2s.iis_cclk = clk_get(&pdev->dev, "i2sclk");
127         if (s3c2412_i2s.iis_cclk == NULL) {
128                 pr_err("failed to get i2sclk clock\n");
129                 iounmap(s3c2412_i2s.regs);
130                 return -ENODEV;
131         }
132
133         /* Set MPLL as the source for IIS CLK */
134
135         clk_set_parent(s3c2412_i2s.iis_cclk, clk_get(NULL, "mpll"));
136         clk_enable(s3c2412_i2s.iis_cclk);
137
138         s3c2412_i2s.iis_cclk = s3c2412_i2s.iis_pclk;
139
140         /* Configure the I2S pins in correct mode */
141         s3c2410_gpio_cfgpin(S3C2410_GPE0, S3C2410_GPE0_I2SLRCK);
142         s3c2410_gpio_cfgpin(S3C2410_GPE1, S3C2410_GPE1_I2SSCLK);
143         s3c2410_gpio_cfgpin(S3C2410_GPE2, S3C2410_GPE2_CDCLK);
144         s3c2410_gpio_cfgpin(S3C2410_GPE3, S3C2410_GPE3_I2SSDI);
145         s3c2410_gpio_cfgpin(S3C2410_GPE4, S3C2410_GPE4_I2SSDO);
146
147         return 0;
148 }
149
150 static int s3c2412_i2s_hw_params(struct snd_pcm_substream *substream,
151                                  struct snd_pcm_hw_params *params,
152                                  struct snd_soc_dai *cpu_dai)
153 {
154         struct s3c_i2sv2_info *i2s = to_info(cpu_dai);
155         struct s3c_dma_params *dma_data;
156         u32 iismod;
157
158         pr_debug("Entered %s\n", __func__);
159
160         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
161                 dma_data = i2s->dma_playback;
162         else
163                 dma_data = i2s->dma_capture;
164
165         snd_soc_dai_set_dma_data(cpu_dai, substream, dma_data);
166
167         iismod = readl(i2s->regs + S3C2412_IISMOD);
168         pr_debug("%s: r: IISMOD: %x\n", __func__, iismod);
169
170         switch (params_format(params)) {
171         case SNDRV_PCM_FORMAT_S8:
172                 iismod |= S3C2412_IISMOD_8BIT;
173                 break;
174         case SNDRV_PCM_FORMAT_S16_LE:
175                 iismod &= ~S3C2412_IISMOD_8BIT;
176                 break;
177         }
178
179         writel(iismod, i2s->regs + S3C2412_IISMOD);
180         pr_debug("%s: w: IISMOD: %x\n", __func__, iismod);
181
182         return 0;
183 }
184
185 #define S3C2412_I2S_RATES \
186         (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
187         SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
188         SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
189
190 static struct snd_soc_dai_ops s3c2412_i2s_dai_ops = {
191         .set_sysclk     = s3c2412_i2s_set_sysclk,
192         .hw_params      = s3c2412_i2s_hw_params,
193 };
194
195 struct snd_soc_dai s3c2412_i2s_dai = {
196         .name           = "s3c2412-i2s",
197         .id             = 0,
198         .probe          = s3c2412_i2s_probe,
199         .playback = {
200                 .channels_min   = 2,
201                 .channels_max   = 2,
202                 .rates          = S3C2412_I2S_RATES,
203                 .formats        = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
204         },
205         .capture = {
206                 .channels_min   = 2,
207                 .channels_max   = 2,
208                 .rates          = S3C2412_I2S_RATES,
209                 .formats        = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
210         },
211         .ops = &s3c2412_i2s_dai_ops,
212 };
213 EXPORT_SYMBOL_GPL(s3c2412_i2s_dai);
214
215 static int __init s3c2412_i2s_init(void)
216 {
217         return  s3c_i2sv2_register_dai(&s3c2412_i2s_dai);
218 }
219 module_init(s3c2412_i2s_init);
220
221 static void __exit s3c2412_i2s_exit(void)
222 {
223         snd_soc_unregister_dai(&s3c2412_i2s_dai);
224 }
225 module_exit(s3c2412_i2s_exit);
226
227 /* Module information */
228 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
229 MODULE_DESCRIPTION("S3C2412 I2S SoC Interface");
230 MODULE_LICENSE("GPL");