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
s3c2412_i2s_probe(struct snd_soc_dai * dai)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
s3c2412_i2s_remove(struct snd_soc_dai * dai)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
s3c2412_i2s_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,struct snd_soc_dai * cpu_dai)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 const struct snd_soc_component_driver s3c2412_i2s_component = {
164 .name = "s3c2412-i2s",
165 };
166
s3c2412_iis_dev_probe(struct platform_device * pdev)167 static int s3c2412_iis_dev_probe(struct platform_device *pdev)
168 {
169 int ret = 0;
170
171 ret = s3c_i2sv2_register_component(&pdev->dev, -1,
172 &s3c2412_i2s_component,
173 &s3c2412_i2s_dai);
174 if (ret) {
175 pr_err("failed to register the dai\n");
176 return ret;
177 }
178
179 ret = asoc_dma_platform_register(&pdev->dev);
180 if (ret) {
181 pr_err("failed to register the DMA: %d\n", ret);
182 goto err;
183 }
184
185 return 0;
186 err:
187 snd_soc_unregister_component(&pdev->dev);
188 return ret;
189 }
190
s3c2412_iis_dev_remove(struct platform_device * pdev)191 static int s3c2412_iis_dev_remove(struct platform_device *pdev)
192 {
193 asoc_dma_platform_unregister(&pdev->dev);
194 snd_soc_unregister_component(&pdev->dev);
195 return 0;
196 }
197
198 static struct platform_driver s3c2412_iis_driver = {
199 .probe = s3c2412_iis_dev_probe,
200 .remove = s3c2412_iis_dev_remove,
201 .driver = {
202 .name = "s3c2412-iis",
203 .owner = THIS_MODULE,
204 },
205 };
206
207 module_platform_driver(s3c2412_iis_driver);
208
209 /* Module information */
210 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
211 MODULE_DESCRIPTION("S3C2412 I2S SoC Interface");
212 MODULE_LICENSE("GPL");
213 MODULE_ALIAS("platform:s3c2412-iis");
214