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
  24 #include <sound/soc.h>
  25 #include <sound/pcm_params.h>
  26
  27 #include <mach/regs-gpio.h>
  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
  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 (s3c2412_i2s.iis_cclk == NULL) {
  73                 pr_err("failed to get i2sclk clock\n");
  74                 iounmap(s3c2412_i2s.regs);
  75                 return -ENODEV;
  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 in correct mode */
  86         s3c2410_gpio_cfgpin(S3C2410_GPE0, S3C2410_GPE0_I2SLRCK);
  87         s3c2410_gpio_cfgpin(S3C2410_GPE1, S3C2410_GPE1_I2SSCLK);
  88         s3c2410_gpio_cfgpin(S3C2410_GPE2, S3C2410_GPE2_CDCLK);
  89         s3c2410_gpio_cfgpin(S3C2410_GPE3, S3C2410_GPE3_I2SSDI);
  90         s3c2410_gpio_cfgpin(S3C2410_GPE4, S3C2410_GPE4_I2SSDO);
  91
  92         return 0;
  93 }
  94
  95 static int s3c2412_i2s_remove(struct snd_soc_dai *dai)
  96 {
  97         clk_disable(s3c2412_i2s.iis_cclk);
  98         clk_put(s3c2412_i2s.iis_cclk);
  99         iounmap(s3c2412_i2s.regs);
 100
 101         return 0;
 102 }
 103
 104 static int s3c2412_i2s_hw_params(struct snd_pcm_substream *substream,
 105                                  struct snd_pcm_hw_params *params,
 106                                  struct snd_soc_dai *cpu_dai)
 107 {
 108         struct s3c_i2sv2_info *i2s = snd_soc_dai_get_drvdata(cpu_dai);
 109         struct s3c_dma_params *dma_data;
 110         u32 iismod;
 111
 112         pr_debug("Entered %s\n", __func__);
 113
 114         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 115                 dma_data = i2s->dma_playback;
 116         else
 117                 dma_data = i2s->dma_capture;
 118
 119         snd_soc_dai_set_dma_data(cpu_dai, substream, dma_data);
 120
 121         iismod = readl(i2s->regs + S3C2412_IISMOD);
 122         pr_debug("%s: r: IISMOD: %x\n", __func__, iismod);
 123
 124         switch (params_format(params)) {
 125         case SNDRV_PCM_FORMAT_S8:
 126                 iismod |= S3C2412_IISMOD_8BIT;
 127                 break;
 128         case SNDRV_PCM_FORMAT_S16_LE:
 129                 iismod &= ~S3C2412_IISMOD_8BIT;
 130                 break;
 131         }
 132
 133         writel(iismod, i2s->regs + S3C2412_IISMOD);
 134         pr_debug("%s: w: IISMOD: %x\n", __func__, iismod);
 135
 136         return 0;
 137 }
 138
 139 #define S3C2412_I2S_RATES \
 140         (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
 141         SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
 142         SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
 143
 144 static struct snd_soc_dai_ops s3c2412_i2s_dai_ops = {
 145         .hw_params      = s3c2412_i2s_hw_params,
 146 };
 147
 148 static struct snd_soc_dai_driver s3c2412_i2s_dai = {
 149         .probe          = s3c2412_i2s_probe,
 150         .remove = s3c2412_i2s_remove,
 151         .playback = {
 152                 .channels_min   = 2,
 153                 .channels_max   = 2,
 154                 .rates          = S3C2412_I2S_RATES,
 155                 .formats        = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
 156         },
 157         .capture = {
 158                 .channels_min   = 2,
 159                 .channels_max   = 2,
 160                 .rates          = S3C2412_I2S_RATES,
 161                 .formats        = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
 162         },
 163         .ops = &s3c2412_i2s_dai_ops,
 164 };
 165
 166 static __devinit int s3c2412_iis_dev_probe(struct platform_device *pdev)
 167 {
 168         return snd_soc_register_dai(&pdev->dev, &s3c2412_i2s_dai);
 169 }
 170
 171 static __devexit int s3c2412_iis_dev_remove(struct platform_device *pdev)
 172 {
 173         snd_soc_unregister_dai(&pdev->dev);
 174         return 0;
 175 }
 176
 177 static struct platform_driver s3c2412_iis_driver = {
 178         .probe  = s3c2412_iis_dev_probe,
 179         .remove = s3c2412_iis_dev_remove,
 180         .driver = {
 181                 .name = "s3c2412-iis",
 182                 .owner = THIS_MODULE,
 183         },
 184 };
 185
 186 static int __init s3c2412_i2s_init(void)
 187 {
 188         return platform_driver_register(&s3c2412_iis_driver);
 189 }
 190 module_init(s3c2412_i2s_init);
 191
 192 static void __exit s3c2412_i2s_exit(void)
 193 {
 194         platform_driver_unregister(&s3c2412_iis_driver);
 195 }
 196 module_exit(s3c2412_i2s_exit);
 197
 198 /* Module information */
 199 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
 200 MODULE_DESCRIPTION("S3C2412 I2S SoC Interface");
 201 MODULE_LICENSE("GPL");
 202 MODULE_ALIAS("platform:s3c2412-iis");