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/gpio-samsung.h>
29 #include <plat/gpio-cfg.h>
30
31 #include "dma.h"
32 #include "regs-i2s-v2.h"
33 #include "s3c2412-i2s.h"
34
35 #include <linux/platform_data/asoc-s3c.h>
36
37 static struct snd_dmaengine_dai_dma_data s3c2412_i2s_pcm_stereo_out = {
38 .chan_name = "tx",
39 .addr_width = 4,
40 };
41
42 static struct snd_dmaengine_dai_dma_data s3c2412_i2s_pcm_stereo_in = {
43 .chan_name = "rx",
44 .addr_width = 4,
45 };
46
47 static struct s3c_i2sv2_info s3c2412_i2s;
48
s3c2412_i2s_probe(struct snd_soc_dai * dai)49 static int s3c2412_i2s_probe(struct snd_soc_dai *dai)
50 {
51 int ret;
52
53 pr_debug("Entered %s\n", __func__);
54
55 snd_soc_dai_init_dma_data(dai, &s3c2412_i2s_pcm_stereo_out,
56 &s3c2412_i2s_pcm_stereo_in);
57
58 ret = s3c_i2sv2_probe(dai, &s3c2412_i2s, S3C2410_PA_IIS);
59 if (ret)
60 return ret;
61
62 s3c2412_i2s.dma_capture = &s3c2412_i2s_pcm_stereo_in;
63 s3c2412_i2s.dma_playback = &s3c2412_i2s_pcm_stereo_out;
64
65 s3c2412_i2s.iis_cclk = devm_clk_get(dai->dev, "i2sclk");
66 if (IS_ERR(s3c2412_i2s.iis_cclk)) {
67 pr_err("failed to get i2sclk clock\n");
68 ret = PTR_ERR(s3c2412_i2s.iis_cclk);
69 goto err;
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 ret = clk_prepare_enable(s3c2412_i2s.iis_cclk);
76 if (ret)
77 goto err;
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 err:
86 s3c_i2sv2_cleanup(dai, &s3c2412_i2s);
87
88 return ret;
89 }
90
s3c2412_i2s_remove(struct snd_soc_dai * dai)91 static int s3c2412_i2s_remove(struct snd_soc_dai *dai)
92 {
93 clk_disable_unprepare(s3c2412_i2s.iis_cclk);
94 s3c_i2sv2_cleanup(dai, &s3c2412_i2s);
95
96 return 0;
97 }
98
s3c2412_i2s_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,struct snd_soc_dai * cpu_dai)99 static int s3c2412_i2s_hw_params(struct snd_pcm_substream *substream,
100 struct snd_pcm_hw_params *params,
101 struct snd_soc_dai *cpu_dai)
102 {
103 struct s3c_i2sv2_info *i2s = snd_soc_dai_get_drvdata(cpu_dai);
104 u32 iismod;
105
106 pr_debug("Entered %s\n", __func__);
107
108 iismod = readl(i2s->regs + S3C2412_IISMOD);
109 pr_debug("%s: r: IISMOD: %x\n", __func__, iismod);
110
111 switch (params_width(params)) {
112 case 8:
113 iismod |= S3C2412_IISMOD_8BIT;
114 break;
115 case 16:
116 iismod &= ~S3C2412_IISMOD_8BIT;
117 break;
118 }
119
120 writel(iismod, i2s->regs + S3C2412_IISMOD);
121 pr_debug("%s: w: IISMOD: %x\n", __func__, iismod);
122
123 return 0;
124 }
125
126 #define S3C2412_I2S_RATES \
127 (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
128 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
129 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
130
131 static const struct snd_soc_dai_ops s3c2412_i2s_dai_ops = {
132 .hw_params = s3c2412_i2s_hw_params,
133 };
134
135 static struct snd_soc_dai_driver s3c2412_i2s_dai = {
136 .probe = s3c2412_i2s_probe,
137 .remove = s3c2412_i2s_remove,
138 .playback = {
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 .capture = {
145 .channels_min = 2,
146 .channels_max = 2,
147 .rates = S3C2412_I2S_RATES,
148 .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
149 },
150 .ops = &s3c2412_i2s_dai_ops,
151 };
152
153 static const struct snd_soc_component_driver s3c2412_i2s_component = {
154 .name = "s3c2412-i2s",
155 };
156
s3c2412_iis_dev_probe(struct platform_device * pdev)157 static int s3c2412_iis_dev_probe(struct platform_device *pdev)
158 {
159 int ret = 0;
160 struct resource *res;
161 struct s3c_audio_pdata *pdata = dev_get_platdata(&pdev->dev);
162
163 if (!pdata) {
164 dev_err(&pdev->dev, "missing platform data");
165 return -ENXIO;
166 }
167
168 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
169 s3c2412_i2s.regs = devm_ioremap_resource(&pdev->dev, res);
170 if (IS_ERR(s3c2412_i2s.regs))
171 return PTR_ERR(s3c2412_i2s.regs);
172
173 s3c2412_i2s_pcm_stereo_out.addr = res->start + S3C2412_IISTXD;
174 s3c2412_i2s_pcm_stereo_out.filter_data = pdata->dma_playback;
175 s3c2412_i2s_pcm_stereo_in.addr = res->start + S3C2412_IISRXD;
176 s3c2412_i2s_pcm_stereo_in.filter_data = pdata->dma_capture;
177
178 ret = samsung_asoc_dma_platform_register(&pdev->dev,
179 pdata->dma_filter,
180 NULL, NULL);
181 if (ret) {
182 pr_err("failed to register the DMA: %d\n", ret);
183 return ret;
184 }
185
186 ret = s3c_i2sv2_register_component(&pdev->dev, -1,
187 &s3c2412_i2s_component,
188 &s3c2412_i2s_dai);
189 if (ret)
190 pr_err("failed to register the dai\n");
191
192 return ret;
193 }
194
195 static struct platform_driver s3c2412_iis_driver = {
196 .probe = s3c2412_iis_dev_probe,
197 .driver = {
198 .name = "s3c2412-iis",
199 },
200 };
201
202 module_platform_driver(s3c2412_iis_driver);
203
204 /* Module information */
205 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
206 MODULE_DESCRIPTION("S3C2412 I2S SoC Interface");
207 MODULE_LICENSE("GPL");
208 MODULE_ALIAS("platform:s3c2412-iis");
209
