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/module.h>
  16 #include <linux/clk.h>
  17 #include <linux/gpio.h>
  18 #include <linux/io.h>
  19 #include <linux/slab.h>
  20
  21 #include <sound/soc.h>
  22
  23 #include <plat/audio.h>
  24
  25 #include <mach/map.h>
  26 #include <mach/dma.h>
  27
  28 #include "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 clk *s3c64xx_i2s_get_clock(struct snd_soc_dai *dai)
  50 {
  51         struct s3c_i2sv2_info *i2s = snd_soc_dai_get_drvdata(dai);
  52         u32 iismod = readl(i2s->regs + S3C2412_IISMOD);
  53
  54         if (iismod & S3C2412_IISMOD_IMS_SYSMUX)
  55                 return i2s->iis_cclk;
  56         else
  57                 return i2s->iis_pclk;
  58 }
  59 EXPORT_SYMBOL_GPL(s3c64xx_i2s_get_clock);
  60
  61 static int s3c64xx_i2s_probe(struct snd_soc_dai *dai)
  62 {
  63         struct s3c_i2sv2_info *i2s;
  64         int ret;
  65
  66         if (dai->id >= MAX_I2SV3) {
  67                 dev_err(dai->dev, "id %d out of range\n", dai->id);
  68                 return -EINVAL;
  69         }
  70
  71         i2s = &s3c64xx_i2s[dai->id];
  72         snd_soc_dai_set_drvdata(dai, i2s);
  73
  74         i2s->iis_cclk = clk_get(dai->dev, "audio-bus");
  75         if (IS_ERR(i2s->iis_cclk)) {
  76                 dev_err(dai->dev, "failed to get audio-bus\n");
  77                 ret = PTR_ERR(i2s->iis_cclk);
  78                 goto err;
  79         }
  80
  81         clk_enable(i2s->iis_cclk);
  82
  83         ret = s3c_i2sv2_probe(dai, i2s, i2s->base);
  84         if (ret)
  85                 goto err_clk;
  86
  87         return 0;
  88
  89 err_clk:
  90         clk_disable(i2s->iis_cclk);
  91         clk_put(i2s->iis_cclk);
  92 err:
  93         kfree(i2s);
  94         return ret;
  95 }
  96
  97 static int s3c64xx_i2s_remove(struct snd_soc_dai *dai)
  98 {
  99         struct s3c_i2sv2_info *i2s = snd_soc_dai_get_drvdata(dai);
 100
 101         clk_disable(i2s->iis_cclk);
 102         clk_put(i2s->iis_cclk);
 103         kfree(i2s);
 104         return 0;
 105 }
 106
 107 static struct snd_soc_dai_ops s3c64xx_i2s_dai_ops;
 108
 109 static struct snd_soc_dai_driver s3c64xx_i2s_dai[MAX_I2SV3] = {
 110 {
 111         .name = "s3c64xx-i2s-0",
 112         .probe = s3c64xx_i2s_probe,
 113         .remove = s3c64xx_i2s_remove,
 114         .playback = {
 115                 .channels_min = 2,
 116                 .channels_max = 2,
 117                 .rates = S3C64XX_I2S_RATES,
 118                 .formats = S3C64XX_I2S_FMTS,},
 119         .capture = {
 120                 .channels_min = 2,
 121                 .channels_max = 2,
 122                 .rates = S3C64XX_I2S_RATES,
 123                 .formats = S3C64XX_I2S_FMTS,},
 124         .ops = &s3c64xx_i2s_dai_ops,
 125         .symmetric_rates = 1,
 126 }, {
 127         .name = "s3c64xx-i2s-1",
 128         .probe = s3c64xx_i2s_probe,
 129         .remove = s3c64xx_i2s_remove,
 130         .playback = {
 131                 .channels_min = 2,
 132                 .channels_max = 2,
 133                 .rates = S3C64XX_I2S_RATES,
 134                 .formats = S3C64XX_I2S_FMTS,},
 135         .capture = {
 136                 .channels_min = 2,
 137                 .channels_max = 2,
 138                 .rates = S3C64XX_I2S_RATES,
 139                 .formats = S3C64XX_I2S_FMTS,},
 140         .ops = &s3c64xx_i2s_dai_ops,
 141         .symmetric_rates = 1,
 142 },};
 143
 144 static __devinit int s3c64xx_iis_dev_probe(struct platform_device *pdev)
 145 {
 146         struct s3c_audio_pdata *i2s_pdata;
 147         struct s3c_i2sv2_info *i2s;
 148         struct resource *res;
 149         int i, ret;
 150
 151         if (pdev->id >= MAX_I2SV3) {
 152                 dev_err(&pdev->dev, "id %d out of range\n", pdev->id);
 153                 return -EINVAL;
 154         }
 155
 156         i2s = &s3c64xx_i2s[pdev->id];
 157
 158         i2s->dma_capture = &s3c64xx_i2s_pcm_stereo_in[pdev->id];
 159         i2s->dma_playback = &s3c64xx_i2s_pcm_stereo_out[pdev->id];
 160
 161         res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
 162         if (!res) {
 163                 dev_err(&pdev->dev, "Unable to get I2S-TX dma resource\n");
 164                 return -ENXIO;
 165         }
 166         i2s->dma_playback->channel = res->start;
 167
 168         res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
 169         if (!res) {
 170                 dev_err(&pdev->dev, "Unable to get I2S-RX dma resource\n");
 171                 return -ENXIO;
 172         }
 173         i2s->dma_capture->channel = res->start;
 174
 175         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 176         if (!res) {
 177                 dev_err(&pdev->dev, "Unable to get I2S SFR address\n");
 178                 return -ENXIO;
 179         }
 180
 181         if (!request_mem_region(res->start, resource_size(res),
 182                                 "s3c64xx-i2s")) {
 183                 dev_err(&pdev->dev, "Unable to request SFR region\n");
 184                 return -EBUSY;
 185         }
 186         i2s->base = res->start;
 187
 188         i2s_pdata = pdev->dev.platform_data;
 189         if (i2s_pdata && i2s_pdata->cfg_gpio && i2s_pdata->cfg_gpio(pdev)) {
 190                 dev_err(&pdev->dev, "Unable to configure gpio\n");
 191                 return -EINVAL;
 192         }
 193         i2s->dma_capture->dma_addr = res->start + S3C2412_IISRXD;
 194         i2s->dma_playback->dma_addr = res->start + S3C2412_IISTXD;
 195
 196         i2s->dma_capture->client = &s3c64xx_dma_client_in;
 197         i2s->dma_capture->dma_size = 4;
 198         i2s->dma_playback->client = &s3c64xx_dma_client_out;
 199         i2s->dma_playback->dma_size = 4;
 200
 201         for (i = 0; i < ARRAY_SIZE(s3c64xx_i2s_dai); i++) {
 202                 ret = s3c_i2sv2_register_dai(&pdev->dev, i,
 203                                                 &s3c64xx_i2s_dai[i]);
 204                 if (ret != 0)
 205                         return ret;
 206         }
 207
 208         return 0;
 209 }
 210
 211 static __devexit int s3c64xx_iis_dev_remove(struct platform_device *pdev)
 212 {
 213         snd_soc_unregister_dais(&pdev->dev, ARRAY_SIZE(s3c64xx_i2s_dai));
 214         return 0;
 215 }
 216
 217 static struct platform_driver s3c64xx_iis_driver = {
 218         .probe  = s3c64xx_iis_dev_probe,
 219         .remove = s3c64xx_iis_dev_remove,
 220         .driver = {
 221                 .name = "s3c64xx-iis",
 222                 .owner = THIS_MODULE,
 223         },
 224 };
 225
 226 static int __init s3c64xx_i2s_init(void)
 227 {
 228         return platform_driver_register(&s3c64xx_iis_driver);
 229 }
 230 module_init(s3c64xx_i2s_init);
 231
 232 static void __exit s3c64xx_i2s_exit(void)
 233 {
 234         platform_driver_unregister(&s3c64xx_iis_driver);
 235 }
 236 module_exit(s3c64xx_i2s_exit);
 237
 238 /* Module information */
 239 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
 240 MODULE_DESCRIPTION("S3C64XX I2S SoC Interface");
 241 MODULE_LICENSE("GPL");
 242 MODULE_ALIAS("platform:s3c64xx-iis");