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   1 /* sound/soc/s3c24xx/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/init.h>
  20 #include <linux/module.h>
  21 #include <linux/device.h>
  22 #include <linux/delay.h>
  23 #include <linux/gpio.h>
  24 #include <linux/clk.h>
  25 #include <linux/kernel.h>
  26 #include <linux/io.h>
  27
  28 #include <sound/core.h>
  29 #include <sound/pcm.h>
  30 #include <sound/pcm_params.h>
  31 #include <sound/initval.h>
  32 #include <sound/soc.h>
  33 #include <mach/hardware.h>
  34
  35 #include <plat/regs-s3c2412-iis.h>
  36
  37 #include <mach/regs-gpio.h>
  38 #include <mach/dma.h>
  39
  40 #include "s3c-dma.h"
  41 #include "s3c2412-i2s.h"
  42
  43 #define S3C2412_I2S_DEBUG 0
  44
  45 static struct s3c2410_dma_client s3c2412_dma_client_out = {
  46         .name           = "I2S PCM Stereo out"
  47 };
  48
  49 static struct s3c2410_dma_client s3c2412_dma_client_in = {
  50         .name           = "I2S PCM Stereo in"
  51 };
  52
  53 static struct s3c_dma_params s3c2412_i2s_pcm_stereo_out = {
  54         .client         = &s3c2412_dma_client_out,
  55         .channel        = DMACH_I2S_OUT,
  56         .dma_addr       = S3C2410_PA_IIS + S3C2412_IISTXD,
  57         .dma_size       = 4,
  58 };
  59
  60 static struct s3c_dma_params s3c2412_i2s_pcm_stereo_in = {
  61         .client         = &s3c2412_dma_client_in,
  62         .channel        = DMACH_I2S_IN,
  63         .dma_addr       = S3C2410_PA_IIS + S3C2412_IISRXD,
  64         .dma_size       = 4,
  65 };
  66
  67 static struct s3c_i2sv2_info s3c2412_i2s;
  68
  69 /*
  70  * Set S3C2412 Clock source
  71  */
  72 static int s3c2412_i2s_set_sysclk(struct snd_soc_dai *cpu_dai,
  73                                   int clk_id, unsigned int freq, int dir)
  74 {
  75         u32 iismod = readl(s3c2412_i2s.regs + S3C2412_IISMOD);
  76
  77         pr_debug("%s(%p, %d, %u, %d)\n", __func__, cpu_dai, clk_id,
  78             freq, dir);
  79
  80         switch (clk_id) {
  81         case S3C2412_CLKSRC_PCLK:
  82                 s3c2412_i2s.master = 1;
  83                 iismod &= ~S3C2412_IISMOD_MASTER_MASK;
  84                 iismod |= S3C2412_IISMOD_MASTER_INTERNAL;
  85                 break;
  86         case S3C2412_CLKSRC_I2SCLK:
  87                 s3c2412_i2s.master = 0;
  88                 iismod &= ~S3C2412_IISMOD_MASTER_MASK;
  89                 iismod |= S3C2412_IISMOD_MASTER_EXTERNAL;
  90                 break;
  91         default:
  92                 return -EINVAL;
  93         }
  94
  95         writel(iismod, s3c2412_i2s.regs + S3C2412_IISMOD);
  96         return 0;
  97 }
  98
  99
 100 struct clk *s3c2412_get_iisclk(void)
 101 {
 102         return s3c2412_i2s.iis_clk;
 103 }
 104 EXPORT_SYMBOL_GPL(s3c2412_get_iisclk);
 105
 106 static inline struct s3c_i2sv2_info *to_info(struct snd_soc_dai *cpu_dai)
 107 {
 108         return cpu_dai->private_data;
 109 }
 110
 111 static int s3c2412_i2s_probe(struct platform_device *pdev,
 112                              struct snd_soc_dai *dai)
 113 {
 114         int ret;
 115
 116         pr_debug("Entered %s\n", __func__);
 117
 118         ret = s3c_i2sv2_probe(pdev, dai, &s3c2412_i2s, S3C2410_PA_IIS);
 119         if (ret)
 120                 return ret;
 121
 122         s3c2412_i2s.dma_capture = &s3c2412_i2s_pcm_stereo_in;
 123         s3c2412_i2s.dma_playback = &s3c2412_i2s_pcm_stereo_out;
 124
 125         s3c2412_i2s.iis_cclk = clk_get(&pdev->dev, "i2sclk");
 126         if (s3c2412_i2s.iis_cclk == NULL) {
 127                 pr_err("failed to get i2sclk clock\n");
 128                 iounmap(s3c2412_i2s.regs);
 129                 return -ENODEV;
 130         }
 131
 132         /* Set MPLL as the source for IIS CLK */
 133
 134         clk_set_parent(s3c2412_i2s.iis_cclk, clk_get(NULL, "mpll"));
 135         clk_enable(s3c2412_i2s.iis_cclk);
 136
 137         s3c2412_i2s.iis_cclk = s3c2412_i2s.iis_pclk;
 138
 139         /* Configure the I2S pins in correct mode */
 140         s3c2410_gpio_cfgpin(S3C2410_GPE0, S3C2410_GPE0_I2SLRCK);
 141         s3c2410_gpio_cfgpin(S3C2410_GPE1, S3C2410_GPE1_I2SSCLK);
 142         s3c2410_gpio_cfgpin(S3C2410_GPE2, S3C2410_GPE2_CDCLK);
 143         s3c2410_gpio_cfgpin(S3C2410_GPE3, S3C2410_GPE3_I2SSDI);
 144         s3c2410_gpio_cfgpin(S3C2410_GPE4, S3C2410_GPE4_I2SSDO);
 145
 146         return 0;
 147 }
 148
 149 static int s3c2412_i2s_hw_params(struct snd_pcm_substream *substream,
 150                                  struct snd_pcm_hw_params *params,
 151                                  struct snd_soc_dai *cpu_dai)
 152 {
 153         struct s3c_i2sv2_info *i2s = to_info(cpu_dai);
 154         u32 iismod;
 155
 156         pr_debug("Entered %s\n", __func__);
 157
 158         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 159                 cpu_dai->dma_data = i2s->dma_playback;
 160         else
 161                 cpu_dai->dma_data = i2s->dma_capture;
 162
 163         iismod = readl(i2s->regs + S3C2412_IISMOD);
 164         pr_debug("%s: r: IISMOD: %x\n", __func__, iismod);
 165
 166         switch (params_format(params)) {
 167         case SNDRV_PCM_FORMAT_S8:
 168                 iismod |= S3C2412_IISMOD_8BIT;
 169                 break;
 170         case SNDRV_PCM_FORMAT_S16_LE:
 171                 iismod &= ~S3C2412_IISMOD_8BIT;
 172                 break;
 173         }
 174
 175         writel(iismod, i2s->regs + S3C2412_IISMOD);
 176         pr_debug("%s: w: IISMOD: %x\n", __func__, iismod);
 177
 178         return 0;
 179 }
 180
 181 #define S3C2412_I2S_RATES \
 182         (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
 183         SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
 184         SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
 185
 186 static struct snd_soc_dai_ops s3c2412_i2s_dai_ops = {
 187         .set_sysclk     = s3c2412_i2s_set_sysclk,
 188         .hw_params      = s3c2412_i2s_hw_params,
 189 };
 190
 191 struct snd_soc_dai s3c2412_i2s_dai = {
 192         .name           = "s3c2412-i2s",
 193         .id             = 0,
 194         .probe          = s3c2412_i2s_probe,
 195         .playback = {
 196                 .channels_min   = 2,
 197                 .channels_max   = 2,
 198                 .rates          = S3C2412_I2S_RATES,
 199                 .formats        = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
 200         },
 201         .capture = {
 202                 .channels_min   = 2,
 203                 .channels_max   = 2,
 204                 .rates          = S3C2412_I2S_RATES,
 205                 .formats        = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
 206         },
 207         .ops = &s3c2412_i2s_dai_ops,
 208 };
 209 EXPORT_SYMBOL_GPL(s3c2412_i2s_dai);
 210
 211 static int __init s3c2412_i2s_init(void)
 212 {
 213         return  s3c_i2sv2_register_dai(&s3c2412_i2s_dai);
 214 }
 215 module_init(s3c2412_i2s_init);
 216
 217 static void __exit s3c2412_i2s_exit(void)
 218 {
 219         snd_soc_unregister_dai(&s3c2412_i2s_dai);
 220 }
 221 module_exit(s3c2412_i2s_exit);
 222
 223 /* Module information */
 224 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
 225 MODULE_DESCRIPTION("S3C2412 I2S SoC Interface");
 226 MODULE_LICENSE("GPL");