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Linux/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 #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_client s3c2412_dma_client_out = {
 37         .name           = "I2S PCM Stereo out"
 38 };
 39 
 40 static struct s3c_dma_client s3c2412_dma_client_in = {
 41         .name           = "I2S PCM Stereo in"
 42 };
 43 
 44 static struct s3c_dma_params s3c2412_i2s_pcm_stereo_out = {
 45         .client         = &s3c2412_dma_client_out,
 46         .channel        = DMACH_I2S_OUT,
 47         .dma_addr       = S3C2410_PA_IIS + S3C2412_IISTXD,
 48         .dma_size       = 4,
 49 };
 50 
 51 static struct s3c_dma_params s3c2412_i2s_pcm_stereo_in = {
 52         .client         = &s3c2412_dma_client_in,
 53         .channel        = DMACH_I2S_IN,
 54         .dma_addr       = S3C2410_PA_IIS + S3C2412_IISRXD,
 55         .dma_size       = 4,
 56 };
 57 
 58 static struct s3c_i2sv2_info s3c2412_i2s;
 59 
 60 static int s3c2412_i2s_probe(struct snd_soc_dai *dai)
 61 {
 62         int ret;
 63 
 64         pr_debug("Entered %s\n", __func__);
 65 
 66         ret = s3c_i2sv2_probe(dai, &s3c2412_i2s, S3C2410_PA_IIS);
 67         if (ret)
 68                 return ret;
 69 
 70         s3c2412_i2s.dma_capture = &s3c2412_i2s_pcm_stereo_in;
 71         s3c2412_i2s.dma_playback = &s3c2412_i2s_pcm_stereo_out;
 72 
 73         s3c2412_i2s.iis_cclk = clk_get(dai->dev, "i2sclk");
 74         if (IS_ERR(s3c2412_i2s.iis_cclk)) {
 75                 pr_err("failed to get i2sclk clock\n");
 76                 iounmap(s3c2412_i2s.regs);
 77                 return PTR_ERR(s3c2412_i2s.iis_cclk);
 78         }
 79 
 80         /* Set MPLL as the source for IIS CLK */
 81 
 82         clk_set_parent(s3c2412_i2s.iis_cclk, clk_get(NULL, "mpll"));
 83         clk_enable(s3c2412_i2s.iis_cclk);
 84 
 85         s3c2412_i2s.iis_cclk = s3c2412_i2s.iis_pclk;
 86 
 87         /* Configure the I2S pins (GPE0...GPE4) in correct mode */
 88         s3c_gpio_cfgall_range(S3C2410_GPE(0), 5, S3C_GPIO_SFN(2),
 89                               S3C_GPIO_PULL_NONE);
 90 
 91         return 0;
 92 }
 93 
 94 static int s3c2412_i2s_remove(struct snd_soc_dai *dai)
 95 {
 96         clk_disable(s3c2412_i2s.iis_cclk);
 97         clk_put(s3c2412_i2s.iis_cclk);
 98         iounmap(s3c2412_i2s.regs);
 99 
100         return 0;
101 }
102 
103 static int s3c2412_i2s_hw_params(struct snd_pcm_substream *substream,
104                                  struct snd_pcm_hw_params *params,
105                                  struct snd_soc_dai *cpu_dai)
106 {
107         struct s3c_i2sv2_info *i2s = snd_soc_dai_get_drvdata(cpu_dai);
108         struct s3c_dma_params *dma_data;
109         u32 iismod;
110 
111         pr_debug("Entered %s\n", __func__);
112 
113         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
114                 dma_data = i2s->dma_playback;
115         else
116                 dma_data = i2s->dma_capture;
117 
118         snd_soc_dai_set_dma_data(cpu_dai, substream, dma_data);
119 
120         iismod = readl(i2s->regs + S3C2412_IISMOD);
121         pr_debug("%s: r: IISMOD: %x\n", __func__, iismod);
122 
123         switch (params_format(params)) {
124         case SNDRV_PCM_FORMAT_S8:
125                 iismod |= S3C2412_IISMOD_8BIT;
126                 break;
127         case SNDRV_PCM_FORMAT_S16_LE:
128                 iismod &= ~S3C2412_IISMOD_8BIT;
129                 break;
130         }
131 
132         writel(iismod, i2s->regs + S3C2412_IISMOD);
133         pr_debug("%s: w: IISMOD: %x\n", __func__, iismod);
134 
135         return 0;
136 }
137 
138 #define S3C2412_I2S_RATES \
139         (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
140         SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
141         SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
142 
143 static const struct snd_soc_dai_ops s3c2412_i2s_dai_ops = {
144         .hw_params      = s3c2412_i2s_hw_params,
145 };
146 
147 static struct snd_soc_dai_driver s3c2412_i2s_dai = {
148         .probe          = s3c2412_i2s_probe,
149         .remove = s3c2412_i2s_remove,
150         .playback = {
151                 .channels_min   = 2,
152                 .channels_max   = 2,
153                 .rates          = S3C2412_I2S_RATES,
154                 .formats        = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
155         },
156         .capture = {
157                 .channels_min   = 2,
158                 .channels_max   = 2,
159                 .rates          = S3C2412_I2S_RATES,
160                 .formats        = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
161         },
162         .ops = &s3c2412_i2s_dai_ops,
163 };
164 
165 static const struct snd_soc_component_driver s3c2412_i2s_component = {
166         .name           = "s3c2412-i2s",
167 };
168 
169 static int s3c2412_iis_dev_probe(struct platform_device *pdev)
170 {
171         int ret = 0;
172 
173         ret = s3c_i2sv2_register_component(&pdev->dev, -1,
174                                            &s3c2412_i2s_component,
175                                            &s3c2412_i2s_dai);
176         if (ret) {
177                 pr_err("failed to register the dai\n");
178                 return ret;
179         }
180 
181         ret = samsung_asoc_dma_platform_register(&pdev->dev);
182         if (ret) {
183                 pr_err("failed to register the DMA: %d\n", ret);
184                 goto err;
185         }
186 
187         return 0;
188 err:
189         snd_soc_unregister_component(&pdev->dev);
190         return ret;
191 }
192 
193 static int s3c2412_iis_dev_remove(struct platform_device *pdev)
194 {
195         samsung_asoc_dma_platform_unregister(&pdev->dev);
196         snd_soc_unregister_component(&pdev->dev);
197         return 0;
198 }
199 
200 static struct platform_driver s3c2412_iis_driver = {
201         .probe  = s3c2412_iis_dev_probe,
202         .remove = s3c2412_iis_dev_remove,
203         .driver = {
204                 .name = "s3c2412-iis",
205                 .owner = THIS_MODULE,
206         },
207 };
208 
209 module_platform_driver(s3c2412_iis_driver);
210 
211 /* Module information */
212 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
213 MODULE_DESCRIPTION("S3C2412 I2S SoC Interface");
214 MODULE_LICENSE("GPL");
215 MODULE_ALIAS("platform:s3c2412-iis");
216 

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