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
  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 (IS_ERR(s3c2412_i2s.iis_cclk)) {
  73                 pr_err("failed to get i2sclk clock\n");
  74                 iounmap(s3c2412_i2s.regs);
  75                 return PTR_ERR(s3c2412_i2s.iis_cclk);
  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 (GPE0...GPE4) in correct mode */
  86         s3c_gpio_cfgall_range(S3C2410_GPE(0), 5, S3C_GPIO_SFN(2),
  87                               S3C_GPIO_PULL_NONE);
  88
  89         return 0;
  90 }
  91
  92 static int s3c2412_i2s_remove(struct snd_soc_dai *dai)
  93 {
  94         clk_disable(s3c2412_i2s.iis_cclk);
  95         clk_put(s3c2412_i2s.iis_cclk);
  96         iounmap(s3c2412_i2s.regs);
  97
  98         return 0;
  99 }
 100
 101 static int s3c2412_i2s_hw_params(struct snd_pcm_substream *substream,
 102                                  struct snd_pcm_hw_params *params,
 103                                  struct snd_soc_dai *cpu_dai)
 104 {
 105         struct s3c_i2sv2_info *i2s = snd_soc_dai_get_drvdata(cpu_dai);
 106         struct s3c_dma_params *dma_data;
 107         u32 iismod;
 108
 109         pr_debug("Entered %s\n", __func__);
 110
 111         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 112                 dma_data = i2s->dma_playback;
 113         else
 114                 dma_data = i2s->dma_capture;
 115
 116         snd_soc_dai_set_dma_data(cpu_dai, substream, dma_data);
 117
 118         iismod = readl(i2s->regs + S3C2412_IISMOD);
 119         pr_debug("%s: r: IISMOD: %x\n", __func__, iismod);
 120
 121         switch (params_format(params)) {
 122         case SNDRV_PCM_FORMAT_S8:
 123                 iismod |= S3C2412_IISMOD_8BIT;
 124                 break;
 125         case SNDRV_PCM_FORMAT_S16_LE:
 126                 iismod &= ~S3C2412_IISMOD_8BIT;
 127                 break;
 128         }
 129
 130         writel(iismod, i2s->regs + S3C2412_IISMOD);
 131         pr_debug("%s: w: IISMOD: %x\n", __func__, iismod);
 132
 133         return 0;
 134 }
 135
 136 #define S3C2412_I2S_RATES \
 137         (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
 138         SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
 139         SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
 140
 141 static const struct snd_soc_dai_ops s3c2412_i2s_dai_ops = {
 142         .hw_params      = s3c2412_i2s_hw_params,
 143 };
 144
 145 static struct snd_soc_dai_driver s3c2412_i2s_dai = {
 146         .probe          = s3c2412_i2s_probe,
 147         .remove = s3c2412_i2s_remove,
 148         .playback = {
 149                 .channels_min   = 2,
 150                 .channels_max   = 2,
 151                 .rates          = S3C2412_I2S_RATES,
 152                 .formats        = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
 153         },
 154         .capture = {
 155                 .channels_min   = 2,
 156                 .channels_max   = 2,
 157                 .rates          = S3C2412_I2S_RATES,
 158                 .formats        = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
 159         },
 160         .ops = &s3c2412_i2s_dai_ops,
 161 };
 162
 163 static __devinit int s3c2412_iis_dev_probe(struct platform_device *pdev)
 164 {
 165         return s3c_i2sv2_register_dai(&pdev->dev, -1, &s3c2412_i2s_dai);
 166 }
 167
 168 static __devexit int s3c2412_iis_dev_remove(struct platform_device *pdev)
 169 {
 170         snd_soc_unregister_dai(&pdev->dev);
 171         return 0;
 172 }
 173
 174 static struct platform_driver s3c2412_iis_driver = {
 175         .probe  = s3c2412_iis_dev_probe,
 176         .remove = __devexit_p(s3c2412_iis_dev_remove),
 177         .driver = {
 178                 .name = "s3c2412-iis",
 179                 .owner = THIS_MODULE,
 180         },
 181 };
 182
 183 module_platform_driver(s3c2412_iis_driver);
 184
 185 /* Module information */
 186 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
 187 MODULE_DESCRIPTION("S3C2412 I2S SoC Interface");
 188 MODULE_LICENSE("GPL");
 189 MODULE_ALIAS("platform:s3c2412-iis");