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 #include <mach/gpio-samsung.h>
30 #include <plat/gpio-cfg.h>
31
32 #include "dma.h"
33 #include "regs-i2s-v2.h"
34 #include "s3c2412-i2s.h"
35
36 static struct s3c_dma_params s3c2412_i2s_pcm_stereo_out = {
37 .slave = (void *)(uintptr_t)DMACH_I2S_OUT,
38 .ch_name = "tx",
39 .dma_size = 4,
40 };
41
42 static struct s3c_dma_params s3c2412_i2s_pcm_stereo_in = {
43 .slave = (void *)(uintptr_t)DMACH_I2S_IN,
44 .ch_name = "rx",
45 .dma_size = 4,
46 };
47
48 static struct s3c_i2sv2_info s3c2412_i2s;
49
s3c2412_i2s_probe(struct snd_soc_dai * dai)50 static int s3c2412_i2s_probe(struct snd_soc_dai *dai)
51 {
52 int ret;
53
54 pr_debug("Entered %s\n", __func__);
55
56 samsung_asoc_init_dma_data(dai, &s3c2412_i2s_pcm_stereo_out,
57 &s3c2412_i2s_pcm_stereo_in);
58
59 ret = s3c_i2sv2_probe(dai, &s3c2412_i2s, S3C2410_PA_IIS);
60 if (ret)
61 return ret;
62
63 s3c2412_i2s.dma_capture = &s3c2412_i2s_pcm_stereo_in;
64 s3c2412_i2s.dma_playback = &s3c2412_i2s_pcm_stereo_out;
65
66 s3c2412_i2s.iis_cclk = devm_clk_get(dai->dev, "i2sclk");
67 if (IS_ERR(s3c2412_i2s.iis_cclk)) {
68 pr_err("failed to get i2sclk clock\n");
69 return PTR_ERR(s3c2412_i2s.iis_cclk);
70 }
71
72 /* Set MPLL as the source for IIS CLK */
73
74 clk_set_parent(s3c2412_i2s.iis_cclk, clk_get(NULL, "mpll"));
75 clk_prepare_enable(s3c2412_i2s.iis_cclk);
76
77 s3c2412_i2s.iis_cclk = s3c2412_i2s.iis_pclk;
78
79 /* Configure the I2S pins (GPE0...GPE4) in correct mode */
80 s3c_gpio_cfgall_range(S3C2410_GPE(0), 5, S3C_GPIO_SFN(2),
81 S3C_GPIO_PULL_NONE);
82
83 return 0;
84 }
85
s3c2412_i2s_remove(struct snd_soc_dai * dai)86 static int s3c2412_i2s_remove(struct snd_soc_dai *dai)
87 {
88 clk_disable_unprepare(s3c2412_i2s.iis_cclk);
89
90 return 0;
91 }
92
s3c2412_i2s_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,struct snd_soc_dai * cpu_dai)93 static int s3c2412_i2s_hw_params(struct snd_pcm_substream *substream,
94 struct snd_pcm_hw_params *params,
95 struct snd_soc_dai *cpu_dai)
96 {
97 struct s3c_i2sv2_info *i2s = snd_soc_dai_get_drvdata(cpu_dai);
98 u32 iismod;
99
100 pr_debug("Entered %s\n", __func__);
101
102 iismod = readl(i2s->regs + S3C2412_IISMOD);
103 pr_debug("%s: r: IISMOD: %x\n", __func__, iismod);
104
105 switch (params_width(params)) {
106 case 8:
107 iismod |= S3C2412_IISMOD_8BIT;
108 break;
109 case 16:
110 iismod &= ~S3C2412_IISMOD_8BIT;
111 break;
112 }
113
114 writel(iismod, i2s->regs + S3C2412_IISMOD);
115 pr_debug("%s: w: IISMOD: %x\n", __func__, iismod);
116
117 return 0;
118 }
119
120 #define S3C2412_I2S_RATES \
121 (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
122 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
123 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
124
125 static const struct snd_soc_dai_ops s3c2412_i2s_dai_ops = {
126 .hw_params = s3c2412_i2s_hw_params,
127 };
128
129 static struct snd_soc_dai_driver s3c2412_i2s_dai = {
130 .probe = s3c2412_i2s_probe,
131 .remove = s3c2412_i2s_remove,
132 .playback = {
133 .channels_min = 2,
134 .channels_max = 2,
135 .rates = S3C2412_I2S_RATES,
136 .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
137 },
138 .capture = {
139 .channels_min = 2,
140 .channels_max = 2,
141 .rates = S3C2412_I2S_RATES,
142 .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
143 },
144 .ops = &s3c2412_i2s_dai_ops,
145 };
146
147 static const struct snd_soc_component_driver s3c2412_i2s_component = {
148 .name = "s3c2412-i2s",
149 };
150
s3c2412_iis_dev_probe(struct platform_device * pdev)151 static int s3c2412_iis_dev_probe(struct platform_device *pdev)
152 {
153 int ret = 0;
154 struct resource *res;
155
156 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
157 s3c2412_i2s.regs = devm_ioremap_resource(&pdev->dev, res);
158 if (IS_ERR(s3c2412_i2s.regs))
159 return PTR_ERR(s3c2412_i2s.regs);
160
161 s3c2412_i2s_pcm_stereo_out.dma_addr = res->start + S3C2412_IISTXD;
162 s3c2412_i2s_pcm_stereo_in.dma_addr = res->start + S3C2412_IISRXD;
163
164 ret = s3c_i2sv2_register_component(&pdev->dev, -1,
165 &s3c2412_i2s_component,
166 &s3c2412_i2s_dai);
167 if (ret) {
168 pr_err("failed to register the dai\n");
169 return ret;
170 }
171
172 ret = samsung_asoc_dma_platform_register(&pdev->dev);
173 if (ret)
174 pr_err("failed to register the DMA: %d\n", ret);
175
176 return ret;
177 }
178
179 static struct platform_driver s3c2412_iis_driver = {
180 .probe = s3c2412_iis_dev_probe,
181 .driver = {
182 .name = "s3c2412-iis",
183 },
184 };
185
186 module_platform_driver(s3c2412_iis_driver);
187
188 /* Module information */
189 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
190 MODULE_DESCRIPTION("S3C2412 I2S SoC Interface");
191 MODULE_LICENSE("GPL");
192 MODULE_ALIAS("platform:s3c2412-iis");
193