sound/soc/s3c24xx/s3c64xx-i2s.c

   1 /* sound/soc/s3c24xx/s3c64xx-i2s.c
   2  *
   3  * ALSA SoC Audio Layer - S3C64XX I2S driver
   4  *
   5  * Copyright 2008 Openmoko, Inc.
   6  * Copyright 2008 Simtec Electronics
   7  *      Ben Dooks <ben@simtec.co.uk>
   8  *      http://armlinux.simtec.co.uk/
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/init.h>
  16 #include <linux/module.h>
  17 #include <linux/device.h>
  18 #include <linux/delay.h>
  19 #include <linux/clk.h>
  20 #include <linux/kernel.h>
  21 #include <linux/gpio.h>
  22 #include <linux/io.h>
  23
  24 #include <sound/core.h>
  25 #include <sound/pcm.h>
  26 #include <sound/pcm_params.h>
  27 #include <sound/initval.h>
  28 #include <sound/soc.h>
  29
  30 #include <plat/regs-s3c2412-iis.h>
  31 #include <plat/gpio-bank-d.h>
  32 #include <plat/gpio-bank-e.h>
  33 #include <plat/gpio-cfg.h>
  34 #include <plat/audio.h>
  35
  36 #include <mach/map.h>
  37 #include <mach/dma.h>
  38
  39 #include "s3c24xx-pcm.h"
  40 #include "s3c64xx-i2s.h"
  41
  42 static struct s3c2410_dma_client s3c64xx_dma_client_out = {
  43         .name           = "I2S PCM Stereo out"
  44 };
  45
  46 static struct s3c2410_dma_client s3c64xx_dma_client_in = {
  47         .name           = "I2S PCM Stereo in"
  48 };
  49
  50 static struct s3c24xx_pcm_dma_params s3c64xx_i2s_pcm_stereo_out[2] = {
  51         [0] = {
  52                 .channel        = DMACH_I2S0_OUT,
  53                 .client         = &s3c64xx_dma_client_out,
  54                 .dma_addr       = S3C64XX_PA_IIS0 + S3C2412_IISTXD,
  55                 .dma_size       = 4,
  56         },
  57         [1] = {
  58                 .channel        = DMACH_I2S1_OUT,
  59                 .client         = &s3c64xx_dma_client_out,
  60                 .dma_addr       = S3C64XX_PA_IIS1 + S3C2412_IISTXD,
  61                 .dma_size       = 4,
  62         },
  63 };
  64
  65 static struct s3c24xx_pcm_dma_params s3c64xx_i2s_pcm_stereo_in[2] = {
  66         [0] = {
  67                 .channel        = DMACH_I2S0_IN,
  68                 .client         = &s3c64xx_dma_client_in,
  69                 .dma_addr       = S3C64XX_PA_IIS0 + S3C2412_IISRXD,
  70                 .dma_size       = 4,
  71         },
  72         [1] = {
  73                 .channel        = DMACH_I2S1_IN,
  74                 .client         = &s3c64xx_dma_client_in,
  75                 .dma_addr       = S3C64XX_PA_IIS1 + S3C2412_IISRXD,
  76                 .dma_size       = 4,
  77         },
  78 };
  79
  80 static struct s3c_i2sv2_info s3c64xx_i2s[2];
  81
  82 static inline struct s3c_i2sv2_info *to_info(struct snd_soc_dai *cpu_dai)
  83 {
  84         return cpu_dai->private_data;
  85 }
  86
  87 static int s3c64xx_i2s_set_sysclk(struct snd_soc_dai *cpu_dai,
  88                                   int clk_id, unsigned int freq, int dir)
  89 {
  90         struct s3c_i2sv2_info *i2s = to_info(cpu_dai);
  91         u32 iismod = readl(i2s->regs + S3C2412_IISMOD);
  92
  93         switch (clk_id) {
  94         case S3C64XX_CLKSRC_PCLK:
  95                 iismod &= ~S3C64XX_IISMOD_IMS_SYSMUX;
  96                 break;
  97
  98         case S3C64XX_CLKSRC_MUX:
  99                 iismod |= S3C64XX_IISMOD_IMS_SYSMUX;
 100                 break;
 101
 102         default:
 103                 return -EINVAL;
 104         }
 105
 106         writel(iismod, i2s->regs + S3C2412_IISMOD);
 107
 108         return 0;
 109 }
 110
 111
 112 unsigned long s3c64xx_i2s_get_clockrate(struct snd_soc_dai *dai)
 113 {
 114         struct s3c_i2sv2_info *i2s = to_info(dai);
 115
 116         return clk_get_rate(i2s->iis_cclk);
 117 }
 118 EXPORT_SYMBOL_GPL(s3c64xx_i2s_get_clockrate);
 119
 120 static int s3c64xx_i2s_probe(struct platform_device *pdev,
 121                              struct snd_soc_dai *dai)
 122 {
 123         struct device *dev = &pdev->dev;
 124         struct s3c_i2sv2_info *i2s;
 125         int ret;
 126
 127         dev_dbg(dev, "%s: probing dai %d\n", __func__, pdev->id);
 128
 129         if (pdev->id < 0 || pdev->id > ARRAY_SIZE(s3c64xx_i2s)) {
 130                 dev_err(dev, "id %d out of range\n", pdev->id);
 131                 return -EINVAL;
 132         }
 133
 134         i2s = &s3c64xx_i2s[pdev->id];
 135
 136         ret = s3c_i2sv2_probe(pdev, dai, i2s,
 137                               pdev->id ? S3C64XX_PA_IIS1 : S3C64XX_PA_IIS0);
 138         if (ret)
 139                 return ret;
 140
 141         i2s->dma_capture = &s3c64xx_i2s_pcm_stereo_in[pdev->id];
 142         i2s->dma_playback = &s3c64xx_i2s_pcm_stereo_out[pdev->id];
 143
 144         i2s->iis_cclk = clk_get(dev, "audio-bus");
 145         if (IS_ERR(i2s->iis_cclk)) {
 146                 dev_err(dev, "failed to get audio-bus");
 147                 iounmap(i2s->regs);
 148                 return -ENODEV;
 149         }
 150
 151         /* configure GPIO for i2s port */
 152         switch (pdev->id) {
 153         case 0:
 154                 s3c_gpio_cfgpin(S3C64XX_GPD(0), S3C64XX_GPD0_I2S0_CLK);
 155                 s3c_gpio_cfgpin(S3C64XX_GPD(1), S3C64XX_GPD1_I2S0_CDCLK);
 156                 s3c_gpio_cfgpin(S3C64XX_GPD(2), S3C64XX_GPD2_I2S0_LRCLK);
 157                 s3c_gpio_cfgpin(S3C64XX_GPD(3), S3C64XX_GPD3_I2S0_DI);
 158                 s3c_gpio_cfgpin(S3C64XX_GPD(4), S3C64XX_GPD4_I2S0_D0);
 159                 break;
 160         case 1:
 161                 s3c_gpio_cfgpin(S3C64XX_GPE(0), S3C64XX_GPE0_I2S1_CLK);
 162                 s3c_gpio_cfgpin(S3C64XX_GPE(1), S3C64XX_GPE1_I2S1_CDCLK);
 163                 s3c_gpio_cfgpin(S3C64XX_GPE(2), S3C64XX_GPE2_I2S1_LRCLK);
 164                 s3c_gpio_cfgpin(S3C64XX_GPE(3), S3C64XX_GPE3_I2S1_DI);
 165                 s3c_gpio_cfgpin(S3C64XX_GPE(4), S3C64XX_GPE4_I2S1_D0);
 166         }
 167
 168         return 0;
 169 }
 170
 171
 172 #define S3C64XX_I2S_RATES \
 173         (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
 174         SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
 175         SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
 176
 177 #define S3C64XX_I2S_FMTS \
 178         (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE)
 179
 180 static struct snd_soc_dai_ops s3c64xx_i2s_dai_ops = {
 181         .set_sysclk     = s3c64xx_i2s_set_sysclk,
 182 };
 183
 184 struct snd_soc_dai s3c64xx_i2s_dai = {
 185         .name           = "s3c64xx-i2s",
 186         .id             = 0,
 187         .probe          = s3c64xx_i2s_probe,
 188         .playback = {
 189                 .channels_min   = 2,
 190                 .channels_max   = 2,
 191                 .rates          = S3C64XX_I2S_RATES,
 192                 .formats        = S3C64XX_I2S_FMTS,
 193         },
 194         .capture = {
 195                 .channels_min   = 2,
 196                 .channels_max   = 2,
 197                 .rates          = S3C64XX_I2S_RATES,
 198                 .formats        = S3C64XX_I2S_FMTS,
 199         },
 200         .ops = &s3c64xx_i2s_dai_ops,
 201 };
 202 EXPORT_SYMBOL_GPL(s3c64xx_i2s_dai);
 203
 204 static int __init s3c64xx_i2s_init(void)
 205 {
 206         return  s3c_i2sv2_register_dai(&s3c64xx_i2s_dai);
 207 }
 208 module_init(s3c64xx_i2s_init);
 209
 210 static void __exit s3c64xx_i2s_exit(void)
 211 {
 212         snd_soc_unregister_dai(&s3c64xx_i2s_dai);
 213 }
 214 module_exit(s3c64xx_i2s_exit);
 215
 216 /* Module information */
 217 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
 218 MODULE_DESCRIPTION("S3C64XX I2S SoC Interface");
 219 MODULE_LICENSE("GPL");
 220
 221
 222