sound/soc/samsung/s3c2412-i2s.c

   1 /* sound/soc/samsung/s3c2412-i2s.c
   2  *
   3  * ALSA Soc Audio Layer - S3C2412 I2S driver
   4  *
   5  * Copyright (c) 2006 Wolfson Microelectronics PLC.
   6  *      Graeme Gregory graeme.gregory@wolfsonmicro.com
   7  *      linux@wolfsonmicro.com
   8  *
   9  * Copyright (c) 2007, 2004-2005 Simtec Electronics
  10  *      http://armlinux.simtec.co.uk/
  11  *      Ben Dooks <ben@simtec.co.uk>
  12  *
  13  * This program is free software; you can redistribute  it and/or modify it
  14  * under  the terms of  the GNU General  Public License as published by the
  15  * Free Software Foundation;  either version 2 of the  License, or (at your
  16  * option) any later version.
  17  */
  18
  19 #include <linux/delay.h>
  20 #include <linux/gpio.h>
  21 #include <linux/clk.h>
  22 #include <linux/io.h>
  23 #include <linux/module.h>
  24
  25 #include <sound/soc.h>
  26 #include <sound/pcm_params.h>
  27
  28 #include <mach/gpio-samsung.h>
  29 #include <plat/gpio-cfg.h>
  30
  31 #include "dma.h"
  32 #include "regs-i2s-v2.h"
  33 #include "s3c2412-i2s.h"
  34
  35 #include <linux/platform_data/asoc-s3c.h>
  36
  37 static struct snd_dmaengine_dai_dma_data s3c2412_i2s_pcm_stereo_out = {
  38         .addr_width     = 4,
  39 };
  40
  41 static struct snd_dmaengine_dai_dma_data s3c2412_i2s_pcm_stereo_in = {
  42         .addr_width     = 4,
  43 };
  44
  45 static struct s3c_i2sv2_info s3c2412_i2s;
  46
  47 static int s3c2412_i2s_probe(struct snd_soc_dai *dai)
  48 {
  49         int ret;
  50
  51         pr_debug("Entered %s\n", __func__);
  52
  53         snd_soc_dai_init_dma_data(dai, &s3c2412_i2s_pcm_stereo_out,
  54                                         &s3c2412_i2s_pcm_stereo_in);
  55
  56         ret = s3c_i2sv2_probe(dai, &s3c2412_i2s, S3C2410_PA_IIS);
  57         if (ret)
  58                 return ret;
  59
  60         s3c2412_i2s.dma_capture = &s3c2412_i2s_pcm_stereo_in;
  61         s3c2412_i2s.dma_playback = &s3c2412_i2s_pcm_stereo_out;
  62
  63         s3c2412_i2s.iis_cclk = devm_clk_get(dai->dev, "i2sclk");
  64         if (IS_ERR(s3c2412_i2s.iis_cclk)) {
  65                 pr_err("failed to get i2sclk clock\n");
  66                 return PTR_ERR(s3c2412_i2s.iis_cclk);
  67         }
  68
  69         /* Set MPLL as the source for IIS CLK */
  70
  71         clk_set_parent(s3c2412_i2s.iis_cclk, clk_get(NULL, "mpll"));
  72         clk_prepare_enable(s3c2412_i2s.iis_cclk);
  73
  74         s3c2412_i2s.iis_cclk = s3c2412_i2s.iis_pclk;
  75
  76         /* Configure the I2S pins (GPE0...GPE4) in correct mode */
  77         s3c_gpio_cfgall_range(S3C2410_GPE(0), 5, S3C_GPIO_SFN(2),
  78                               S3C_GPIO_PULL_NONE);
  79
  80         return 0;
  81 }
  82
  83 static int s3c2412_i2s_remove(struct snd_soc_dai *dai)
  84 {
  85         clk_disable_unprepare(s3c2412_i2s.iis_cclk);
  86
  87         return 0;
  88 }
  89
  90 static int s3c2412_i2s_hw_params(struct snd_pcm_substream *substream,
  91                                  struct snd_pcm_hw_params *params,
  92                                  struct snd_soc_dai *cpu_dai)
  93 {
  94         struct s3c_i2sv2_info *i2s = snd_soc_dai_get_drvdata(cpu_dai);
  95         u32 iismod;
  96
  97         pr_debug("Entered %s\n", __func__);
  98
  99         iismod = readl(i2s->regs + S3C2412_IISMOD);
 100         pr_debug("%s: r: IISMOD: %x\n", __func__, iismod);
 101
 102         switch (params_width(params)) {
 103         case 8:
 104                 iismod |= S3C2412_IISMOD_8BIT;
 105                 break;
 106         case 16:
 107                 iismod &= ~S3C2412_IISMOD_8BIT;
 108                 break;
 109         }
 110
 111         writel(iismod, i2s->regs + S3C2412_IISMOD);
 112         pr_debug("%s: w: IISMOD: %x\n", __func__, iismod);
 113
 114         return 0;
 115 }
 116
 117 #define S3C2412_I2S_RATES \
 118         (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
 119         SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
 120         SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
 121
 122 static const struct snd_soc_dai_ops s3c2412_i2s_dai_ops = {
 123         .hw_params      = s3c2412_i2s_hw_params,
 124 };
 125
 126 static struct snd_soc_dai_driver s3c2412_i2s_dai = {
 127         .probe          = s3c2412_i2s_probe,
 128         .remove = s3c2412_i2s_remove,
 129         .playback = {
 130                 .channels_min   = 2,
 131                 .channels_max   = 2,
 132                 .rates          = S3C2412_I2S_RATES,
 133                 .formats        = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
 134         },
 135         .capture = {
 136                 .channels_min   = 2,
 137                 .channels_max   = 2,
 138                 .rates          = S3C2412_I2S_RATES,
 139                 .formats        = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
 140         },
 141         .ops = &s3c2412_i2s_dai_ops,
 142 };
 143
 144 static const struct snd_soc_component_driver s3c2412_i2s_component = {
 145         .name           = "s3c2412-i2s",
 146 };
 147
 148 static int s3c2412_iis_dev_probe(struct platform_device *pdev)
 149 {
 150         int ret = 0;
 151         struct resource *res;
 152         struct s3c_audio_pdata *pdata = dev_get_platdata(&pdev->dev);
 153
 154         if (!pdata) {
 155                 dev_err(&pdev->dev, "missing platform data");
 156                 return -ENXIO;
 157         }
 158
 159         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 160         s3c2412_i2s.regs = devm_ioremap_resource(&pdev->dev, res);
 161         if (IS_ERR(s3c2412_i2s.regs))
 162                 return PTR_ERR(s3c2412_i2s.regs);
 163
 164         s3c2412_i2s_pcm_stereo_out.addr = res->start + S3C2412_IISTXD;
 165         s3c2412_i2s_pcm_stereo_out.filter_data = pdata->dma_playback;
 166         s3c2412_i2s_pcm_stereo_in.addr = res->start + S3C2412_IISRXD;
 167         s3c2412_i2s_pcm_stereo_in.filter_data = pdata->dma_capture;
 168
 169         ret = samsung_asoc_dma_platform_register(&pdev->dev,
 170                                                  pdata->dma_filter,
 171                                                  NULL, NULL);
 172         if (ret) {
 173                 pr_err("failed to register the DMA: %d\n", ret);
 174                 return ret;
 175         }
 176
 177         ret = s3c_i2sv2_register_component(&pdev->dev, -1,
 178                                            &s3c2412_i2s_component,
 179                                            &s3c2412_i2s_dai);
 180         if (ret)
 181                 pr_err("failed to register the dai\n");
 182
 183         return ret;
 184 }
 185
 186 static struct platform_driver s3c2412_iis_driver = {
 187         .probe  = s3c2412_iis_dev_probe,
 188         .driver = {
 189                 .name = "s3c2412-iis",
 190         },
 191 };
 192
 193 module_platform_driver(s3c2412_iis_driver);
 194
 195 /* Module information */
 196 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
 197 MODULE_DESCRIPTION("S3C2412 I2S SoC Interface");
 198 MODULE_LICENSE("GPL");
 199 MODULE_ALIAS("platform:s3c2412-iis");