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/regs-gpio.h>
  29 #include <mach/dma.h>
  30
  31 #include "dma.h"
  32 #include "regs-i2s-v2.h"
  33 #include "s3c2412-i2s.h"
  34
  35 static struct s3c2410_dma_client s3c2412_dma_client_out = {
  36         .name           = "I2S PCM Stereo out"
  37 };
  38
  39 static struct s3c2410_dma_client s3c2412_dma_client_in = {
  40         .name           = "I2S PCM Stereo in"
  41 };
  42
  43 static struct s3c_dma_params s3c2412_i2s_pcm_stereo_out = {
  44         .client         = &s3c2412_dma_client_out,
  45         .channel        = DMACH_I2S_OUT,
  46         .dma_addr       = S3C2410_PA_IIS + S3C2412_IISTXD,
  47         .dma_size       = 4,
  48 };
  49
  50 static struct s3c_dma_params s3c2412_i2s_pcm_stereo_in = {
  51         .client         = &s3c2412_dma_client_in,
  52         .channel        = DMACH_I2S_IN,
  53         .dma_addr       = S3C2410_PA_IIS + S3C2412_IISRXD,
  54         .dma_size       = 4,
  55 };
  56
  57 static struct s3c_i2sv2_info s3c2412_i2s;
  58
  59 static int s3c2412_i2s_probe(struct snd_soc_dai *dai)
  60 {
  61         int ret;
  62
  63         pr_debug("Entered %s\n", __func__);
  64
  65         ret = s3c_i2sv2_probe(dai, &s3c2412_i2s, S3C2410_PA_IIS);
  66         if (ret)
  67                 return ret;
  68
  69         s3c2412_i2s.dma_capture = &s3c2412_i2s_pcm_stereo_in;
  70         s3c2412_i2s.dma_playback = &s3c2412_i2s_pcm_stereo_out;
  71
  72         s3c2412_i2s.iis_cclk = clk_get(dai->dev, "i2sclk");
  73         if (IS_ERR(s3c2412_i2s.iis_cclk)) {
  74                 pr_err("failed to get i2sclk clock\n");
  75                 iounmap(s3c2412_i2s.regs);
  76                 return PTR_ERR(s3c2412_i2s.iis_cclk);
  77         }
  78
  79         /* Set MPLL as the source for IIS CLK */
  80
  81         clk_set_parent(s3c2412_i2s.iis_cclk, clk_get(NULL, "mpll"));
  82         clk_enable(s3c2412_i2s.iis_cclk);
  83
  84         s3c2412_i2s.iis_cclk = s3c2412_i2s.iis_pclk;
  85
  86         /* Configure the I2S pins in correct mode */
  87         s3c2410_gpio_cfgpin(S3C2410_GPE0, S3C2410_GPE0_I2SLRCK);
  88         s3c2410_gpio_cfgpin(S3C2410_GPE1, S3C2410_GPE1_I2SSCLK);
  89         s3c2410_gpio_cfgpin(S3C2410_GPE2, S3C2410_GPE2_CDCLK);
  90         s3c2410_gpio_cfgpin(S3C2410_GPE3, S3C2410_GPE3_I2SSDI);
  91         s3c2410_gpio_cfgpin(S3C2410_GPE4, S3C2410_GPE4_I2SSDO);
  92
  93         return 0;
  94 }
  95
  96 static int s3c2412_i2s_remove(struct snd_soc_dai *dai)
  97 {
  98         clk_disable(s3c2412_i2s.iis_cclk);
  99         clk_put(s3c2412_i2s.iis_cclk);
 100         iounmap(s3c2412_i2s.regs);
 101
 102         return 0;
 103 }
 104
 105 static int s3c2412_i2s_hw_params(struct snd_pcm_substream *substream,
 106                                  struct snd_pcm_hw_params *params,
 107                                  struct snd_soc_dai *cpu_dai)
 108 {
 109         struct s3c_i2sv2_info *i2s = snd_soc_dai_get_drvdata(cpu_dai);
 110         struct s3c_dma_params *dma_data;
 111         u32 iismod;
 112
 113         pr_debug("Entered %s\n", __func__);
 114
 115         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 116                 dma_data = i2s->dma_playback;
 117         else
 118                 dma_data = i2s->dma_capture;
 119
 120         snd_soc_dai_set_dma_data(cpu_dai, substream, dma_data);
 121
 122         iismod = readl(i2s->regs + S3C2412_IISMOD);
 123         pr_debug("%s: r: IISMOD: %x\n", __func__, iismod);
 124
 125         switch (params_format(params)) {
 126         case SNDRV_PCM_FORMAT_S8:
 127                 iismod |= S3C2412_IISMOD_8BIT;
 128                 break;
 129         case SNDRV_PCM_FORMAT_S16_LE:
 130                 iismod &= ~S3C2412_IISMOD_8BIT;
 131                 break;
 132         }
 133
 134         writel(iismod, i2s->regs + S3C2412_IISMOD);
 135         pr_debug("%s: w: IISMOD: %x\n", __func__, iismod);
 136
 137         return 0;
 138 }
 139
 140 #define S3C2412_I2S_RATES \
 141         (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
 142         SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
 143         SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
 144
 145 static const struct snd_soc_dai_ops s3c2412_i2s_dai_ops = {
 146         .hw_params      = s3c2412_i2s_hw_params,
 147 };
 148
 149 static struct snd_soc_dai_driver s3c2412_i2s_dai = {
 150         .probe          = s3c2412_i2s_probe,
 151         .remove = s3c2412_i2s_remove,
 152         .playback = {
 153                 .channels_min   = 2,
 154                 .channels_max   = 2,
 155                 .rates          = S3C2412_I2S_RATES,
 156                 .formats        = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
 157         },
 158         .capture = {
 159                 .channels_min   = 2,
 160                 .channels_max   = 2,
 161                 .rates          = S3C2412_I2S_RATES,
 162                 .formats        = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
 163         },
 164         .ops = &s3c2412_i2s_dai_ops,
 165 };
 166
 167 static __devinit int s3c2412_iis_dev_probe(struct platform_device *pdev)
 168 {
 169         return s3c_i2sv2_register_dai(&pdev->dev, -1, &s3c2412_i2s_dai);
 170 }
 171
 172 static __devexit int s3c2412_iis_dev_remove(struct platform_device *pdev)
 173 {
 174         snd_soc_unregister_dai(&pdev->dev);
 175         return 0;
 176 }
 177
 178 static struct platform_driver s3c2412_iis_driver = {
 179         .probe  = s3c2412_iis_dev_probe,
 180         .remove = __devexit_p(s3c2412_iis_dev_remove),
 181         .driver = {
 182                 .name = "s3c2412-iis",
 183                 .owner = THIS_MODULE,
 184         },
 185 };
 186
 187 module_platform_driver(s3c2412_iis_driver);
 188
 189 /* Module information */
 190 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
 191 MODULE_DESCRIPTION("S3C2412 I2S SoC Interface");
 192 MODULE_LICENSE("GPL");
 193 MODULE_ALIAS("platform:s3c2412-iis");