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Diffstat (limited to 'sound/soc/samsung/s3c2412-i2s.c')
-rw-r--r--sound/soc/samsung/s3c2412-i2s.c212
1 files changed, 212 insertions, 0 deletions
diff --git a/sound/soc/samsung/s3c2412-i2s.c b/sound/soc/samsung/s3c2412-i2s.c
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1/* sound/soc/samsung/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 "dma.h"
39#include "regs-i2s-v2.h"
40#include "s3c2412-i2s.h"
41
42#define S3C2412_I2S_DEBUG 0
43
44static struct s3c2410_dma_client s3c2412_dma_client_out = {
45 .name = "I2S PCM Stereo out"
46};
47
48static struct s3c2410_dma_client s3c2412_dma_client_in = {
49 .name = "I2S PCM Stereo in"
50};
51
52static 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
59static 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
66static struct s3c_i2sv2_info s3c2412_i2s;
67
68static int s3c2412_i2s_probe(struct snd_soc_dai *dai)
69{
70 int ret;
71
72 pr_debug("Entered %s\n", __func__);
73
74 ret = s3c_i2sv2_probe(dai, &s3c2412_i2s, S3C2410_PA_IIS);
75 if (ret)
76 return ret;
77
78 s3c2412_i2s.dma_capture = &s3c2412_i2s_pcm_stereo_in;
79 s3c2412_i2s.dma_playback = &s3c2412_i2s_pcm_stereo_out;
80
81 s3c2412_i2s.iis_cclk = clk_get(dai->dev, "i2sclk");
82 if (s3c2412_i2s.iis_cclk == NULL) {
83 pr_err("failed to get i2sclk clock\n");
84 iounmap(s3c2412_i2s.regs);
85 return -ENODEV;
86 }
87
88 /* Set MPLL as the source for IIS CLK */
89
90 clk_set_parent(s3c2412_i2s.iis_cclk, clk_get(NULL, "mpll"));
91 clk_enable(s3c2412_i2s.iis_cclk);
92
93 s3c2412_i2s.iis_cclk = s3c2412_i2s.iis_pclk;
94
95 /* Configure the I2S pins in correct mode */
96 s3c2410_gpio_cfgpin(S3C2410_GPE0, S3C2410_GPE0_I2SLRCK);
97 s3c2410_gpio_cfgpin(S3C2410_GPE1, S3C2410_GPE1_I2SSCLK);
98 s3c2410_gpio_cfgpin(S3C2410_GPE2, S3C2410_GPE2_CDCLK);
99 s3c2410_gpio_cfgpin(S3C2410_GPE3, S3C2410_GPE3_I2SSDI);
100 s3c2410_gpio_cfgpin(S3C2410_GPE4, S3C2410_GPE4_I2SSDO);
101
102 return 0;
103}
104
105static int s3c2412_i2s_remove(struct snd_soc_dai *dai)
106{
107 clk_disable(s3c2412_i2s.iis_cclk);
108 clk_put(s3c2412_i2s.iis_cclk);
109 iounmap(s3c2412_i2s.regs);
110
111 return 0;
112}
113
114static int s3c2412_i2s_hw_params(struct snd_pcm_substream *substream,
115 struct snd_pcm_hw_params *params,
116 struct snd_soc_dai *cpu_dai)
117{
118 struct s3c_i2sv2_info *i2s = snd_soc_dai_get_drvdata(cpu_dai);
119 struct s3c_dma_params *dma_data;
120 u32 iismod;
121
122 pr_debug("Entered %s\n", __func__);
123
124 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
125 dma_data = i2s->dma_playback;
126 else
127 dma_data = i2s->dma_capture;
128
129 snd_soc_dai_set_dma_data(cpu_dai, substream, dma_data);
130
131 iismod = readl(i2s->regs + S3C2412_IISMOD);
132 pr_debug("%s: r: IISMOD: %x\n", __func__, iismod);
133
134 switch (params_format(params)) {
135 case SNDRV_PCM_FORMAT_S8:
136 iismod |= S3C2412_IISMOD_8BIT;
137 break;
138 case SNDRV_PCM_FORMAT_S16_LE:
139 iismod &= ~S3C2412_IISMOD_8BIT;
140 break;
141 }
142
143 writel(iismod, i2s->regs + S3C2412_IISMOD);
144 pr_debug("%s: w: IISMOD: %x\n", __func__, iismod);
145
146 return 0;
147}
148
149#define S3C2412_I2S_RATES \
150 (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
151 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
152 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
153
154static struct snd_soc_dai_ops s3c2412_i2s_dai_ops = {
155 .hw_params = s3c2412_i2s_hw_params,
156};
157
158static struct snd_soc_dai_driver s3c2412_i2s_dai = {
159 .probe = s3c2412_i2s_probe,
160 .remove = s3c2412_i2s_remove,
161 .playback = {
162 .channels_min = 2,
163 .channels_max = 2,
164 .rates = S3C2412_I2S_RATES,
165 .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
166 },
167 .capture = {
168 .channels_min = 2,
169 .channels_max = 2,
170 .rates = S3C2412_I2S_RATES,
171 .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
172 },
173 .ops = &s3c2412_i2s_dai_ops,
174};
175
176static __devinit int s3c2412_iis_dev_probe(struct platform_device *pdev)
177{
178 return snd_soc_register_dai(&pdev->dev, &s3c2412_i2s_dai);
179}
180
181static __devexit int s3c2412_iis_dev_remove(struct platform_device *pdev)
182{
183 snd_soc_unregister_dai(&pdev->dev);
184 return 0;
185}
186
187static struct platform_driver s3c2412_iis_driver = {
188 .probe = s3c2412_iis_dev_probe,
189 .remove = s3c2412_iis_dev_remove,
190 .driver = {
191 .name = "s3c2412-iis",
192 .owner = THIS_MODULE,
193 },
194};
195
196static int __init s3c2412_i2s_init(void)
197{
198 return platform_driver_register(&s3c2412_iis_driver);
199}
200module_init(s3c2412_i2s_init);
201
202static void __exit s3c2412_i2s_exit(void)
203{
204 platform_driver_unregister(&s3c2412_iis_driver);
205}
206module_exit(s3c2412_i2s_exit);
207
208/* Module information */
209MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
210MODULE_DESCRIPTION("S3C2412 I2S SoC Interface");
211MODULE_LICENSE("GPL");
212MODULE_ALIAS("platform:s3c2412-iis");