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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/clk.h>
  19 #include <linux/gpio.h>
  20 #include <linux/io.h>
  21
  22 #include <sound/soc.h>
  23
  24 #include <plat/regs-s3c2412-iis.h>
  25 #include <mach/gpio-bank-d.h>
  26 #include <mach/gpio-bank-e.h>
  27 #include <plat/gpio-cfg.h>
  28
  29 #include <mach/map.h>
  30 #include <mach/dma.h>
  31
  32 #include "s3c-dma.h"
  33 #include "s3c64xx-i2s.h"
  34
  35 /* The value should be set to maximum of the total number
  36  * of I2Sv3 controllers that any supported SoC has.
  37  */
  38 #define MAX_I2SV3       2
  39
  40 static struct s3c2410_dma_client s3c64xx_dma_client_out = {
  41         .name           = "I2S PCM Stereo out"
  42 };
  43
  44 static struct s3c2410_dma_client s3c64xx_dma_client_in = {
  45         .name           = "I2S PCM Stereo in"
  46 };
  47
  48 static struct s3c_dma_params s3c64xx_i2s_pcm_stereo_out[MAX_I2SV3];
  49 static struct s3c_dma_params s3c64xx_i2s_pcm_stereo_in[MAX_I2SV3];
  50 static struct s3c_i2sv2_info s3c64xx_i2s[MAX_I2SV3];
  51
  52 struct snd_soc_dai s3c64xx_i2s_dai[MAX_I2SV3];
  53 EXPORT_SYMBOL_GPL(s3c64xx_i2s_dai);
  54
  55 static inline struct s3c_i2sv2_info *to_info(struct snd_soc_dai *cpu_dai)
  56 {
  57         return cpu_dai->private_data;
  58 }
  59
  60 static int s3c64xx_i2s_set_sysclk(struct snd_soc_dai *cpu_dai,
  61                                   int clk_id, unsigned int freq, int dir)
  62 {
  63         struct s3c_i2sv2_info *i2s = to_info(cpu_dai);
  64         u32 iismod = readl(i2s->regs + S3C2412_IISMOD);
  65
  66         switch (clk_id) {
  67         case S3C64XX_CLKSRC_PCLK:
  68                 iismod &= ~S3C64XX_IISMOD_IMS_SYSMUX;
  69                 break;
  70
  71         case S3C64XX_CLKSRC_MUX:
  72                 iismod |= S3C64XX_IISMOD_IMS_SYSMUX;
  73                 break;
  74
  75         case S3C64XX_CLKSRC_CDCLK:
  76                 switch (dir) {
  77                 case SND_SOC_CLOCK_IN:
  78                         iismod |= S3C64XX_IISMOD_CDCLKCON;
  79                         break;
  80                 case SND_SOC_CLOCK_OUT:
  81                         iismod &= ~S3C64XX_IISMOD_CDCLKCON;
  82                         break;
  83                 default:
  84                         return -EINVAL;
  85                 }
  86                 break;
  87
  88         default:
  89                 return -EINVAL;
  90         }
  91
  92         writel(iismod, i2s->regs + S3C2412_IISMOD);
  93
  94         return 0;
  95 }
  96
  97 struct clk *s3c64xx_i2s_get_clock(struct snd_soc_dai *dai)
  98 {
  99         struct s3c_i2sv2_info *i2s = to_info(dai);
 100         u32 iismod = readl(i2s->regs + S3C2412_IISMOD);
 101
 102         if (iismod & S3C64XX_IISMOD_IMS_SYSMUX)
 103                 return i2s->iis_cclk;
 104         else
 105                 return i2s->iis_pclk;
 106 }
 107 EXPORT_SYMBOL_GPL(s3c64xx_i2s_get_clock);
 108
 109 static int s3c64xx_i2s_probe(struct platform_device *pdev,
 110                              struct snd_soc_dai *dai)
 111 {
 112         /* configure GPIO for i2s port */
 113         switch (dai->id) {
 114         case 0:
 115                 s3c_gpio_cfgpin(S3C64XX_GPD(0), S3C64XX_GPD0_I2S0_CLK);
 116                 s3c_gpio_cfgpin(S3C64XX_GPD(1), S3C64XX_GPD1_I2S0_CDCLK);
 117                 s3c_gpio_cfgpin(S3C64XX_GPD(2), S3C64XX_GPD2_I2S0_LRCLK);
 118                 s3c_gpio_cfgpin(S3C64XX_GPD(3), S3C64XX_GPD3_I2S0_DI);
 119                 s3c_gpio_cfgpin(S3C64XX_GPD(4), S3C64XX_GPD4_I2S0_D0);
 120                 break;
 121         case 1:
 122                 s3c_gpio_cfgpin(S3C64XX_GPE(0), S3C64XX_GPE0_I2S1_CLK);
 123                 s3c_gpio_cfgpin(S3C64XX_GPE(1), S3C64XX_GPE1_I2S1_CDCLK);
 124                 s3c_gpio_cfgpin(S3C64XX_GPE(2), S3C64XX_GPE2_I2S1_LRCLK);
 125                 s3c_gpio_cfgpin(S3C64XX_GPE(3), S3C64XX_GPE3_I2S1_DI);
 126                 s3c_gpio_cfgpin(S3C64XX_GPE(4), S3C64XX_GPE4_I2S1_D0);
 127         }
 128
 129         return 0;
 130 }
 131
 132
 133 #define S3C64XX_I2S_RATES \
 134         (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
 135         SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
 136         SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
 137
 138 #define S3C64XX_I2S_FMTS \
 139         (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE |\
 140          SNDRV_PCM_FMTBIT_S24_LE)
 141
 142 static struct snd_soc_dai_ops s3c64xx_i2s_dai_ops = {
 143         .set_sysclk     = s3c64xx_i2s_set_sysclk,
 144 };
 145
 146 static __devinit int s3c64xx_iis_dev_probe(struct platform_device *pdev)
 147 {
 148         struct s3c_i2sv2_info *i2s;
 149         struct snd_soc_dai *dai;
 150         int ret;
 151
 152         if (pdev->id >= MAX_I2SV3) {
 153                 dev_err(&pdev->dev, "id %d out of range\n", pdev->id);
 154                 return -EINVAL;
 155         }
 156
 157         i2s = &s3c64xx_i2s[pdev->id];
 158         dai = &s3c64xx_i2s_dai[pdev->id];
 159         dai->dev = &pdev->dev;
 160         dai->name = "s3c64xx-i2s";
 161         dai->id = pdev->id;
 162         dai->symmetric_rates = 1;
 163         dai->playback.channels_min = 2;
 164         dai->playback.channels_max = 2;
 165         dai->playback.rates = S3C64XX_I2S_RATES;
 166         dai->playback.formats = S3C64XX_I2S_FMTS;
 167         dai->capture.channels_min = 2;
 168         dai->capture.channels_max = 2;
 169         dai->capture.rates = S3C64XX_I2S_RATES;
 170         dai->capture.formats = S3C64XX_I2S_FMTS;
 171         dai->probe = s3c64xx_i2s_probe;
 172         dai->ops = &s3c64xx_i2s_dai_ops;
 173
 174         i2s->dma_capture = &s3c64xx_i2s_pcm_stereo_in[pdev->id];
 175         i2s->dma_playback = &s3c64xx_i2s_pcm_stereo_out[pdev->id];
 176
 177         if (pdev->id == 0) {
 178                 i2s->dma_capture->channel = DMACH_I2S0_IN;
 179                 i2s->dma_capture->dma_addr = S3C64XX_PA_IIS0 + S3C2412_IISRXD;
 180                 i2s->dma_playback->channel = DMACH_I2S0_OUT;
 181                 i2s->dma_playback->dma_addr = S3C64XX_PA_IIS0 + S3C2412_IISTXD;
 182         } else {
 183                 i2s->dma_capture->channel = DMACH_I2S1_IN;
 184                 i2s->dma_capture->dma_addr = S3C64XX_PA_IIS1 + S3C2412_IISRXD;
 185                 i2s->dma_playback->channel = DMACH_I2S1_OUT;
 186                 i2s->dma_playback->dma_addr = S3C64XX_PA_IIS1 + S3C2412_IISTXD;
 187         }
 188
 189         i2s->dma_capture->client = &s3c64xx_dma_client_in;
 190         i2s->dma_capture->dma_size = 4;
 191         i2s->dma_playback->client = &s3c64xx_dma_client_out;
 192         i2s->dma_playback->dma_size = 4;
 193
 194         i2s->iis_cclk = clk_get(&pdev->dev, "audio-bus");
 195         if (IS_ERR(i2s->iis_cclk)) {
 196                 dev_err(&pdev->dev, "failed to get audio-bus\n");
 197                 ret = PTR_ERR(i2s->iis_cclk);
 198                 goto err;
 199         }
 200
 201         clk_enable(i2s->iis_cclk);
 202
 203         ret = s3c_i2sv2_probe(pdev, dai, i2s, 0);
 204         if (ret)
 205                 goto err_clk;
 206
 207         ret = s3c_i2sv2_register_dai(dai);
 208         if (ret != 0)
 209                 goto err_i2sv2;
 210
 211         return 0;
 212
 213 err_i2sv2:
 214         /* Not implemented for I2Sv2 core yet */
 215 err_clk:
 216         clk_put(i2s->iis_cclk);
 217 err:
 218         return ret;
 219 }
 220
 221 static __devexit int s3c64xx_iis_dev_remove(struct platform_device *pdev)
 222 {
 223         dev_err(&pdev->dev, "Device removal not yet supported\n");
 224         return 0;
 225 }
 226
 227 static struct platform_driver s3c64xx_iis_driver = {
 228         .probe  = s3c64xx_iis_dev_probe,
 229         .remove = s3c64xx_iis_dev_remove,
 230         .driver = {
 231                 .name = "s3c64xx-iis",
 232                 .owner = THIS_MODULE,
 233         },
 234 };
 235
 236 static int __init s3c64xx_i2s_init(void)
 237 {
 238         return platform_driver_register(&s3c64xx_iis_driver);
 239 }
 240 module_init(s3c64xx_i2s_init);
 241
 242 static void __exit s3c64xx_i2s_exit(void)
 243 {
 244         platform_driver_unregister(&s3c64xx_iis_driver);
 245 }
 246 module_exit(s3c64xx_i2s_exit);
 247
 248 /* Module information */
 249 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
 250 MODULE_DESCRIPTION("S3C64XX I2S SoC Interface");
 251 MODULE_LICENSE("GPL");