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Merge branch 'akpm' (Andrew's patch-bomb)
[can-eth-gw-linux.git] / sound / soc / samsung / s3c2412-i2s.c
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/delay.h>
20 #include <linux/gpio.h>
21 #include <linux/clk.h>
22 #include <linux/io.h>
23 #include <linux/module.h>
24
25 #include <sound/soc.h>
26 #include <sound/pcm_params.h>
27
28 #include <mach/dma.h>
29
30 #include "dma.h"
31 #include "regs-i2s-v2.h"
32 #include "s3c2412-i2s.h"
33
34 static struct s3c2410_dma_client s3c2412_dma_client_out = {
35         .name           = "I2S PCM Stereo out"
36 };
37
38 static struct s3c2410_dma_client s3c2412_dma_client_in = {
39         .name           = "I2S PCM Stereo in"
40 };
41
42 static struct s3c_dma_params s3c2412_i2s_pcm_stereo_out = {
43         .client         = &s3c2412_dma_client_out,
44         .channel        = DMACH_I2S_OUT,
45         .dma_addr       = S3C2410_PA_IIS + S3C2412_IISTXD,
46         .dma_size       = 4,
47 };
48
49 static struct s3c_dma_params s3c2412_i2s_pcm_stereo_in = {
50         .client         = &s3c2412_dma_client_in,
51         .channel        = DMACH_I2S_IN,
52         .dma_addr       = S3C2410_PA_IIS + S3C2412_IISRXD,
53         .dma_size       = 4,
54 };
55
56 static struct s3c_i2sv2_info s3c2412_i2s;
57
58 static int s3c2412_i2s_probe(struct snd_soc_dai *dai)
59 {
60         int ret;
61
62         pr_debug("Entered %s\n", __func__);
63
64         ret = s3c_i2sv2_probe(dai, &s3c2412_i2s, S3C2410_PA_IIS);
65         if (ret)
66                 return ret;
67
68         s3c2412_i2s.dma_capture = &s3c2412_i2s_pcm_stereo_in;
69         s3c2412_i2s.dma_playback = &s3c2412_i2s_pcm_stereo_out;
70
71         s3c2412_i2s.iis_cclk = clk_get(dai->dev, "i2sclk");
72         if (IS_ERR(s3c2412_i2s.iis_cclk)) {
73                 pr_err("failed to get i2sclk clock\n");
74                 iounmap(s3c2412_i2s.regs);
75                 return PTR_ERR(s3c2412_i2s.iis_cclk);
76         }
77
78         /* Set MPLL as the source for IIS CLK */
79
80         clk_set_parent(s3c2412_i2s.iis_cclk, clk_get(NULL, "mpll"));
81         clk_enable(s3c2412_i2s.iis_cclk);
82
83         s3c2412_i2s.iis_cclk = s3c2412_i2s.iis_pclk;
84
85         /* Configure the I2S pins (GPE0...GPE4) in correct mode */
86         s3c_gpio_cfgall_range(S3C2410_GPE(0), 5, S3C_GPIO_SFN(2),
87                               S3C_GPIO_PULL_NONE);
88
89         return 0;
90 }
91
92 static int s3c2412_i2s_remove(struct snd_soc_dai *dai)
93 {
94         clk_disable(s3c2412_i2s.iis_cclk);
95         clk_put(s3c2412_i2s.iis_cclk);
96         iounmap(s3c2412_i2s.regs);
97
98         return 0;
99 }
100
101 static int s3c2412_i2s_hw_params(struct snd_pcm_substream *substream,
102                                  struct snd_pcm_hw_params *params,
103                                  struct snd_soc_dai *cpu_dai)
104 {
105         struct s3c_i2sv2_info *i2s = snd_soc_dai_get_drvdata(cpu_dai);
106         struct s3c_dma_params *dma_data;
107         u32 iismod;
108
109         pr_debug("Entered %s\n", __func__);
110
111         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
112                 dma_data = i2s->dma_playback;
113         else
114                 dma_data = i2s->dma_capture;
115
116         snd_soc_dai_set_dma_data(cpu_dai, substream, dma_data);
117
118         iismod = readl(i2s->regs + S3C2412_IISMOD);
119         pr_debug("%s: r: IISMOD: %x\n", __func__, iismod);
120
121         switch (params_format(params)) {
122         case SNDRV_PCM_FORMAT_S8:
123                 iismod |= S3C2412_IISMOD_8BIT;
124                 break;
125         case SNDRV_PCM_FORMAT_S16_LE:
126                 iismod &= ~S3C2412_IISMOD_8BIT;
127                 break;
128         }
129
130         writel(iismod, i2s->regs + S3C2412_IISMOD);
131         pr_debug("%s: w: IISMOD: %x\n", __func__, iismod);
132
133         return 0;
134 }
135
136 #define S3C2412_I2S_RATES \
137         (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
138         SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
139         SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
140
141 static const struct snd_soc_dai_ops s3c2412_i2s_dai_ops = {
142         .hw_params      = s3c2412_i2s_hw_params,
143 };
144
145 static struct snd_soc_dai_driver s3c2412_i2s_dai = {
146         .probe          = s3c2412_i2s_probe,
147         .remove = s3c2412_i2s_remove,
148         .playback = {
149                 .channels_min   = 2,
150                 .channels_max   = 2,
151                 .rates          = S3C2412_I2S_RATES,
152                 .formats        = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
153         },
154         .capture = {
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         .ops = &s3c2412_i2s_dai_ops,
161 };
162
163 static int s3c2412_iis_dev_probe(struct platform_device *pdev)
164 {
165         int ret = 0;
166
167         ret = s3c_i2sv2_register_dai(&pdev->dev, -1, &s3c2412_i2s_dai);
168         if (ret) {
169                 pr_err("failed to register the dai\n");
170                 return ret;
171         }
172
173         ret = asoc_dma_platform_register(&pdev->dev);
174         if (ret) {
175                 pr_err("failed to register the DMA: %d\n", ret);
176                 goto err;
177         }
178
179         return 0;
180 err:
181         snd_soc_unregister_dai(&pdev->dev);
182         return ret;
183 }
184
185 static int s3c2412_iis_dev_remove(struct platform_device *pdev)
186 {
187         asoc_dma_platform_unregister(&pdev->dev);
188         snd_soc_unregister_dai(&pdev->dev);
189         return 0;
190 }
191
192 static struct platform_driver s3c2412_iis_driver = {
193         .probe  = s3c2412_iis_dev_probe,
194         .remove = s3c2412_iis_dev_remove,
195         .driver = {
196                 .name = "s3c2412-iis",
197                 .owner = THIS_MODULE,
198         },
199 };
200
201 module_platform_driver(s3c2412_iis_driver);
202
203 /* Module information */
204 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
205 MODULE_DESCRIPTION("S3C2412 I2S SoC Interface");
206 MODULE_LICENSE("GPL");
207 MODULE_ALIAS("platform:s3c2412-iis");