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   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
  35 #include <mach/map.h>
  36 #include <mach/dma.h>
  37
  38 #include "s3c-dma.h"
  39 #include "s3c64xx-i2s.h"
  40
  41 static struct s3c2410_dma_client s3c64xx_dma_client_out = {
  42         .name           = "I2S PCM Stereo out"
  43 };
  44
  45 static struct s3c2410_dma_client s3c64xx_dma_client_in = {
  46         .name           = "I2S PCM Stereo in"
  47 };
  48
  49 static struct s3c_dma_params s3c64xx_i2s_pcm_stereo_out[2] = {
  50         [0] = {
  51                 .channel        = DMACH_I2S0_OUT,
  52                 .client         = &s3c64xx_dma_client_out,
  53                 .dma_addr       = S3C64XX_PA_IIS0 + S3C2412_IISTXD,
  54                 .dma_size       = 4,
  55         },
  56         [1] = {
  57                 .channel        = DMACH_I2S1_OUT,
  58                 .client         = &s3c64xx_dma_client_out,
  59                 .dma_addr       = S3C64XX_PA_IIS1 + S3C2412_IISTXD,
  60                 .dma_size       = 4,
  61         },
  62 };
  63
  64 static struct s3c_dma_params s3c64xx_i2s_pcm_stereo_in[2] = {
  65         [0] = {
  66                 .channel        = DMACH_I2S0_IN,
  67                 .client         = &s3c64xx_dma_client_in,
  68                 .dma_addr       = S3C64XX_PA_IIS0 + S3C2412_IISRXD,
  69                 .dma_size       = 4,
  70         },
  71         [1] = {
  72                 .channel        = DMACH_I2S1_IN,
  73                 .client         = &s3c64xx_dma_client_in,
  74                 .dma_addr       = S3C64XX_PA_IIS1 + S3C2412_IISRXD,
  75                 .dma_size       = 4,
  76         },
  77 };
  78
  79 static struct s3c_i2sv2_info s3c64xx_i2s[2];
  80
  81 static inline struct s3c_i2sv2_info *to_info(struct snd_soc_dai *cpu_dai)
  82 {
  83         return cpu_dai->private_data;
  84 }
  85
  86 static int s3c64xx_i2s_set_sysclk(struct snd_soc_dai *cpu_dai,
  87                                   int clk_id, unsigned int freq, int dir)
  88 {
  89         struct s3c_i2sv2_info *i2s = to_info(cpu_dai);
  90         u32 iismod = readl(i2s->regs + S3C2412_IISMOD);
  91
  92         switch (clk_id) {
  93         case S3C64XX_CLKSRC_PCLK:
  94                 iismod &= ~S3C64XX_IISMOD_IMS_SYSMUX;
  95                 break;
  96
  97         case S3C64XX_CLKSRC_MUX:
  98                 iismod |= S3C64XX_IISMOD_IMS_SYSMUX;
  99                 break;
 100
 101         case S3C64XX_CLKSRC_CDCLK:
 102                 switch (dir) {
 103                 case SND_SOC_CLOCK_IN:
 104                         iismod |= S3C64XX_IISMOD_CDCLKCON;
 105                         break;
 106                 case SND_SOC_CLOCK_OUT:
 107                         iismod &= ~S3C64XX_IISMOD_CDCLKCON;
 108                         break;
 109                 default:
 110                         return -EINVAL;
 111                 }
 112                 break;
 113
 114         default:
 115                 return -EINVAL;
 116         }
 117
 118         writel(iismod, i2s->regs + S3C2412_IISMOD);
 119
 120         return 0;
 121 }
 122
 123 struct clk *s3c64xx_i2s_get_clock(struct snd_soc_dai *dai)
 124 {
 125         struct s3c_i2sv2_info *i2s = to_info(dai);
 126         u32 iismod = readl(i2s->regs + S3C2412_IISMOD);
 127
 128         if (iismod & S3C64XX_IISMOD_IMS_SYSMUX)
 129                 return i2s->iis_cclk;
 130         else
 131                 return i2s->iis_pclk;
 132 }
 133 EXPORT_SYMBOL_GPL(s3c64xx_i2s_get_clock);
 134
 135 static int s3c64xx_i2s_probe(struct platform_device *pdev,
 136                              struct snd_soc_dai *dai)
 137 {
 138         /* configure GPIO for i2s port */
 139         switch (dai->id) {
 140         case 0:
 141                 s3c_gpio_cfgpin(S3C64XX_GPD(0), S3C64XX_GPD0_I2S0_CLK);
 142                 s3c_gpio_cfgpin(S3C64XX_GPD(1), S3C64XX_GPD1_I2S0_CDCLK);
 143                 s3c_gpio_cfgpin(S3C64XX_GPD(2), S3C64XX_GPD2_I2S0_LRCLK);
 144                 s3c_gpio_cfgpin(S3C64XX_GPD(3), S3C64XX_GPD3_I2S0_DI);
 145                 s3c_gpio_cfgpin(S3C64XX_GPD(4), S3C64XX_GPD4_I2S0_D0);
 146                 break;
 147         case 1:
 148                 s3c_gpio_cfgpin(S3C64XX_GPE(0), S3C64XX_GPE0_I2S1_CLK);
 149                 s3c_gpio_cfgpin(S3C64XX_GPE(1), S3C64XX_GPE1_I2S1_CDCLK);
 150                 s3c_gpio_cfgpin(S3C64XX_GPE(2), S3C64XX_GPE2_I2S1_LRCLK);
 151                 s3c_gpio_cfgpin(S3C64XX_GPE(3), S3C64XX_GPE3_I2S1_DI);
 152                 s3c_gpio_cfgpin(S3C64XX_GPE(4), S3C64XX_GPE4_I2S1_D0);
 153         }
 154
 155         return 0;
 156 }
 157
 158
 159 #define S3C64XX_I2S_RATES \
 160         (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
 161         SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
 162         SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
 163
 164 #define S3C64XX_I2S_FMTS \
 165         (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE |\
 166          SNDRV_PCM_FMTBIT_S24_LE)
 167
 168 static struct snd_soc_dai_ops s3c64xx_i2s_dai_ops = {
 169         .set_sysclk     = s3c64xx_i2s_set_sysclk,
 170 };
 171
 172 struct snd_soc_dai s3c64xx_i2s_dai[] = {
 173         {
 174                 .name           = "s3c64xx-i2s",
 175                 .id             = 0,
 176                 .probe          = s3c64xx_i2s_probe,
 177                 .playback = {
 178                         .channels_min   = 2,
 179                         .channels_max   = 2,
 180                         .rates          = S3C64XX_I2S_RATES,
 181                         .formats        = S3C64XX_I2S_FMTS,
 182                 },
 183                 .capture = {
 184                          .channels_min  = 2,
 185                          .channels_max  = 2,
 186                          .rates         = S3C64XX_I2S_RATES,
 187                          .formats       = S3C64XX_I2S_FMTS,
 188                  },
 189                 .ops = &s3c64xx_i2s_dai_ops,
 190                 .symmetric_rates = 1,
 191         },
 192         {
 193                 .name           = "s3c64xx-i2s",
 194                 .id             = 1,
 195                 .probe          = s3c64xx_i2s_probe,
 196                 .playback = {
 197                         .channels_min   = 2,
 198                         .channels_max   = 2,
 199                         .rates          = S3C64XX_I2S_RATES,
 200                         .formats        = S3C64XX_I2S_FMTS,
 201                 },
 202                 .capture = {
 203                          .channels_min  = 2,
 204                          .channels_max  = 2,
 205                          .rates         = S3C64XX_I2S_RATES,
 206                          .formats       = S3C64XX_I2S_FMTS,
 207                  },
 208                 .ops = &s3c64xx_i2s_dai_ops,
 209                 .symmetric_rates = 1,
 210         },
 211 };
 212 EXPORT_SYMBOL_GPL(s3c64xx_i2s_dai);
 213
 214 static __devinit int s3c64xx_iis_dev_probe(struct platform_device *pdev)
 215 {
 216         struct s3c_i2sv2_info *i2s;
 217         struct snd_soc_dai *dai;
 218         int ret;
 219
 220         if (pdev->id >= ARRAY_SIZE(s3c64xx_i2s)) {
 221                 dev_err(&pdev->dev, "id %d out of range\n", pdev->id);
 222                 return -EINVAL;
 223         }
 224
 225         i2s = &s3c64xx_i2s[pdev->id];
 226         dai = &s3c64xx_i2s_dai[pdev->id];
 227         dai->dev = &pdev->dev;
 228
 229         i2s->dma_capture = &s3c64xx_i2s_pcm_stereo_in[pdev->id];
 230         i2s->dma_playback = &s3c64xx_i2s_pcm_stereo_out[pdev->id];
 231
 232         i2s->iis_cclk = clk_get(&pdev->dev, "audio-bus");
 233         if (IS_ERR(i2s->iis_cclk)) {
 234                 dev_err(&pdev->dev, "failed to get audio-bus\n");
 235                 ret = PTR_ERR(i2s->iis_cclk);
 236                 goto err;
 237         }
 238
 239         clk_enable(i2s->iis_cclk);
 240
 241         ret = s3c_i2sv2_probe(pdev, dai, i2s, 0);
 242         if (ret)
 243                 goto err_clk;
 244
 245         ret = s3c_i2sv2_register_dai(dai);
 246         if (ret != 0)
 247                 goto err_i2sv2;
 248
 249         return 0;
 250
 251 err_i2sv2:
 252         /* Not implemented for I2Sv2 core yet */
 253 err_clk:
 254         clk_put(i2s->iis_cclk);
 255 err:
 256         return ret;
 257 }
 258
 259 static __devexit int s3c64xx_iis_dev_remove(struct platform_device *pdev)
 260 {
 261         dev_err(&pdev->dev, "Device removal not yet supported\n");
 262         return 0;
 263 }
 264
 265 static struct platform_driver s3c64xx_iis_driver = {
 266         .probe  = s3c64xx_iis_dev_probe,
 267         .remove = s3c64xx_iis_dev_remove,
 268         .driver = {
 269                 .name = "s3c64xx-iis",
 270                 .owner = THIS_MODULE,
 271         },
 272 };
 273
 274 static int __init s3c64xx_i2s_init(void)
 275 {
 276         return platform_driver_register(&s3c64xx_iis_driver);
 277 }
 278 module_init(s3c64xx_i2s_init);
 279
 280 static void __exit s3c64xx_i2s_exit(void)
 281 {
 282         platform_driver_unregister(&s3c64xx_iis_driver);
 283 }
 284 module_exit(s3c64xx_i2s_exit);
 285
 286 /* Module information */
 287 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
 288 MODULE_DESCRIPTION("S3C64XX I2S SoC Interface");
 289 MODULE_LICENSE("GPL");