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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/clk.h>
  16 #include <linux/gpio.h>
  17 #include <linux/io.h>
  18
  19 #include <sound/soc.h>
  20
  21 #include <mach/gpio-bank-d.h>
  22 #include <mach/gpio-bank-e.h>
  23 #include <plat/gpio-cfg.h>
  24
  25 #include <mach/map.h>
  26 #include <mach/dma.h>
  27
  28 #include "s3c-dma.h"
  29 #include "regs-i2s-v2.h"
  30 #include "s3c64xx-i2s.h"
  31
  32 /* The value should be set to maximum of the total number
  33  * of I2Sv3 controllers that any supported SoC has.
  34  */
  35 #define MAX_I2SV3       2
  36
  37 static struct s3c2410_dma_client s3c64xx_dma_client_out = {
  38         .name           = "I2S PCM Stereo out"
  39 };
  40
  41 static struct s3c2410_dma_client s3c64xx_dma_client_in = {
  42         .name           = "I2S PCM Stereo in"
  43 };
  44
  45 static struct s3c_dma_params s3c64xx_i2s_pcm_stereo_out[MAX_I2SV3];
  46 static struct s3c_dma_params s3c64xx_i2s_pcm_stereo_in[MAX_I2SV3];
  47 static struct s3c_i2sv2_info s3c64xx_i2s[MAX_I2SV3];
  48
  49 struct snd_soc_dai s3c64xx_i2s_dai[MAX_I2SV3];
  50 EXPORT_SYMBOL_GPL(s3c64xx_i2s_dai);
  51
  52 static inline struct s3c_i2sv2_info *to_info(struct snd_soc_dai *cpu_dai)
  53 {
  54         return cpu_dai->private_data;
  55 }
  56
  57 static int s3c64xx_i2s_set_sysclk(struct snd_soc_dai *cpu_dai,
  58                                   int clk_id, unsigned int freq, int dir)
  59 {
  60         struct s3c_i2sv2_info *i2s = to_info(cpu_dai);
  61         u32 iismod = readl(i2s->regs + S3C2412_IISMOD);
  62
  63         switch (clk_id) {
  64         case S3C64XX_CLKSRC_PCLK:
  65                 iismod &= ~S3C64XX_IISMOD_IMS_SYSMUX;
  66                 break;
  67
  68         case S3C64XX_CLKSRC_MUX:
  69                 iismod |= S3C64XX_IISMOD_IMS_SYSMUX;
  70                 break;
  71
  72         case S3C64XX_CLKSRC_CDCLK:
  73                 switch (dir) {
  74                 case SND_SOC_CLOCK_IN:
  75                         iismod |= S3C64XX_IISMOD_CDCLKCON;
  76                         break;
  77                 case SND_SOC_CLOCK_OUT:
  78                         iismod &= ~S3C64XX_IISMOD_CDCLKCON;
  79                         break;
  80                 default:
  81                         return -EINVAL;
  82                 }
  83                 break;
  84
  85         default:
  86                 return -EINVAL;
  87         }
  88
  89         writel(iismod, i2s->regs + S3C2412_IISMOD);
  90
  91         return 0;
  92 }
  93
  94 struct clk *s3c64xx_i2s_get_clock(struct snd_soc_dai *dai)
  95 {
  96         struct s3c_i2sv2_info *i2s = to_info(dai);
  97         u32 iismod = readl(i2s->regs + S3C2412_IISMOD);
  98
  99         if (iismod & S3C64XX_IISMOD_IMS_SYSMUX)
 100                 return i2s->iis_cclk;
 101         else
 102                 return i2s->iis_pclk;
 103 }
 104 EXPORT_SYMBOL_GPL(s3c64xx_i2s_get_clock);
 105
 106 static int s3c64xx_i2s_probe(struct platform_device *pdev,
 107                              struct snd_soc_dai *dai)
 108 {
 109         /* configure GPIO for i2s port */
 110         switch (dai->id) {
 111         case 0:
 112                 s3c_gpio_cfgpin(S3C64XX_GPD(0), S3C64XX_GPD0_I2S0_CLK);
 113                 s3c_gpio_cfgpin(S3C64XX_GPD(1), S3C64XX_GPD1_I2S0_CDCLK);
 114                 s3c_gpio_cfgpin(S3C64XX_GPD(2), S3C64XX_GPD2_I2S0_LRCLK);
 115                 s3c_gpio_cfgpin(S3C64XX_GPD(3), S3C64XX_GPD3_I2S0_DI);
 116                 s3c_gpio_cfgpin(S3C64XX_GPD(4), S3C64XX_GPD4_I2S0_D0);
 117                 break;
 118         case 1:
 119                 s3c_gpio_cfgpin(S3C64XX_GPE(0), S3C64XX_GPE0_I2S1_CLK);
 120                 s3c_gpio_cfgpin(S3C64XX_GPE(1), S3C64XX_GPE1_I2S1_CDCLK);
 121                 s3c_gpio_cfgpin(S3C64XX_GPE(2), S3C64XX_GPE2_I2S1_LRCLK);
 122                 s3c_gpio_cfgpin(S3C64XX_GPE(3), S3C64XX_GPE3_I2S1_DI);
 123                 s3c_gpio_cfgpin(S3C64XX_GPE(4), S3C64XX_GPE4_I2S1_D0);
 124         }
 125
 126         return 0;
 127 }
 128
 129
 130 static struct snd_soc_dai_ops s3c64xx_i2s_dai_ops = {
 131         .set_sysclk     = s3c64xx_i2s_set_sysclk,
 132 };
 133
 134 static __devinit int s3c64xx_iis_dev_probe(struct platform_device *pdev)
 135 {
 136         struct s3c_i2sv2_info *i2s;
 137         struct snd_soc_dai *dai;
 138         int ret;
 139
 140         if (pdev->id >= MAX_I2SV3) {
 141                 dev_err(&pdev->dev, "id %d out of range\n", pdev->id);
 142                 return -EINVAL;
 143         }
 144
 145         i2s = &s3c64xx_i2s[pdev->id];
 146         dai = &s3c64xx_i2s_dai[pdev->id];
 147         dai->dev = &pdev->dev;
 148         dai->name = "s3c64xx-i2s";
 149         dai->id = pdev->id;
 150         dai->symmetric_rates = 1;
 151         dai->playback.channels_min = 2;
 152         dai->playback.channels_max = 2;
 153         dai->playback.rates = S3C64XX_I2S_RATES;
 154         dai->playback.formats = S3C64XX_I2S_FMTS;
 155         dai->capture.channels_min = 2;
 156         dai->capture.channels_max = 2;
 157         dai->capture.rates = S3C64XX_I2S_RATES;
 158         dai->capture.formats = S3C64XX_I2S_FMTS;
 159         dai->probe = s3c64xx_i2s_probe;
 160         dai->ops = &s3c64xx_i2s_dai_ops;
 161
 162         i2s->dma_capture = &s3c64xx_i2s_pcm_stereo_in[pdev->id];
 163         i2s->dma_playback = &s3c64xx_i2s_pcm_stereo_out[pdev->id];
 164
 165         if (pdev->id == 0) {
 166                 i2s->dma_capture->channel = DMACH_I2S0_IN;
 167                 i2s->dma_capture->dma_addr = S3C64XX_PA_IIS0 + S3C2412_IISRXD;
 168                 i2s->dma_playback->channel = DMACH_I2S0_OUT;
 169                 i2s->dma_playback->dma_addr = S3C64XX_PA_IIS0 + S3C2412_IISTXD;
 170         } else {
 171                 i2s->dma_capture->channel = DMACH_I2S1_IN;
 172                 i2s->dma_capture->dma_addr = S3C64XX_PA_IIS1 + S3C2412_IISRXD;
 173                 i2s->dma_playback->channel = DMACH_I2S1_OUT;
 174                 i2s->dma_playback->dma_addr = S3C64XX_PA_IIS1 + S3C2412_IISTXD;
 175         }
 176
 177         i2s->dma_capture->client = &s3c64xx_dma_client_in;
 178         i2s->dma_capture->dma_size = 4;
 179         i2s->dma_playback->client = &s3c64xx_dma_client_out;
 180         i2s->dma_playback->dma_size = 4;
 181
 182         i2s->iis_cclk = clk_get(&pdev->dev, "audio-bus");
 183         if (IS_ERR(i2s->iis_cclk)) {
 184                 dev_err(&pdev->dev, "failed to get audio-bus\n");
 185                 ret = PTR_ERR(i2s->iis_cclk);
 186                 goto err;
 187         }
 188
 189         clk_enable(i2s->iis_cclk);
 190
 191         ret = s3c_i2sv2_probe(pdev, dai, i2s, 0);
 192         if (ret)
 193                 goto err_clk;
 194
 195         ret = s3c_i2sv2_register_dai(dai);
 196         if (ret != 0)
 197                 goto err_i2sv2;
 198
 199         return 0;
 200
 201 err_i2sv2:
 202         /* Not implemented for I2Sv2 core yet */
 203 err_clk:
 204         clk_put(i2s->iis_cclk);
 205 err:
 206         return ret;
 207 }
 208
 209 static __devexit int s3c64xx_iis_dev_remove(struct platform_device *pdev)
 210 {
 211         dev_err(&pdev->dev, "Device removal not yet supported\n");
 212         return 0;
 213 }
 214
 215 static struct platform_driver s3c64xx_iis_driver = {
 216         .probe  = s3c64xx_iis_dev_probe,
 217         .remove = s3c64xx_iis_dev_remove,
 218         .driver = {
 219                 .name = "s3c64xx-iis",
 220                 .owner = THIS_MODULE,
 221         },
 222 };
 223
 224 static int __init s3c64xx_i2s_init(void)
 225 {
 226         return platform_driver_register(&s3c64xx_iis_driver);
 227 }
 228 module_init(s3c64xx_i2s_init);
 229
 230 static void __exit s3c64xx_i2s_exit(void)
 231 {
 232         platform_driver_unregister(&s3c64xx_iis_driver);
 233 }
 234 module_exit(s3c64xx_i2s_exit);
 235
 236 /* Module information */
 237 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
 238 MODULE_DESCRIPTION("S3C64XX I2S SoC Interface");
 239 MODULE_LICENSE("GPL");