kernel/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/dma.h>
  29 #include <mach/gpio-samsung.h>
  30 #include <plat/gpio-cfg.h>
  31
  32 #include "dma.h"
  33 #include "regs-i2s-v2.h"
  34 #include "s3c2412-i2s.h"
  35
  36 static struct s3c_dma_params s3c2412_i2s_pcm_stereo_out = {
  37         .channel        = DMACH_I2S_OUT,
  38         .ch_name        = "tx",
  39         .dma_size       = 4,
  40 };
  41
  42 static struct s3c_dma_params s3c2412_i2s_pcm_stereo_in = {
  43         .channel        = DMACH_I2S_IN,
  44         .ch_name        = "rx",
  45         .dma_size       = 4,
  46 };
  47
  48 static struct s3c_i2sv2_info s3c2412_i2s;
  49
  50 static int s3c2412_i2s_probe(struct snd_soc_dai *dai)
  51 {
  52         int ret;
  53
  54         pr_debug("Entered %s\n", __func__);
  55
  56         samsung_asoc_init_dma_data(dai, &s3c2412_i2s_pcm_stereo_out,
  57                 &s3c2412_i2s_pcm_stereo_in);
  58
  59         ret = s3c_i2sv2_probe(dai, &s3c2412_i2s, S3C2410_PA_IIS);
  60         if (ret)
  61                 return ret;
  62
  63         s3c2412_i2s.dma_capture = &s3c2412_i2s_pcm_stereo_in;
  64         s3c2412_i2s.dma_playback = &s3c2412_i2s_pcm_stereo_out;
  65
  66         s3c2412_i2s.iis_cclk = devm_clk_get(dai->dev, "i2sclk");
  67         if (IS_ERR(s3c2412_i2s.iis_cclk)) {
  68                 pr_err("failed to get i2sclk clock\n");
  69                 return PTR_ERR(s3c2412_i2s.iis_cclk);
  70         }
  71
  72         /* Set MPLL as the source for IIS CLK */
  73
  74         clk_set_parent(s3c2412_i2s.iis_cclk, clk_get(NULL, "mpll"));
  75         clk_prepare_enable(s3c2412_i2s.iis_cclk);
  76
  77         s3c2412_i2s.iis_cclk = s3c2412_i2s.iis_pclk;
  78
  79         /* Configure the I2S pins (GPE0...GPE4) in correct mode */
  80         s3c_gpio_cfgall_range(S3C2410_GPE(0), 5, S3C_GPIO_SFN(2),
  81                               S3C_GPIO_PULL_NONE);
  82
  83         return 0;
  84 }
  85
  86 static int s3c2412_i2s_remove(struct snd_soc_dai *dai)
  87 {
  88         clk_disable_unprepare(s3c2412_i2s.iis_cclk);
  89
  90         return 0;
  91 }
  92
  93 static int s3c2412_i2s_hw_params(struct snd_pcm_substream *substream,
  94                                  struct snd_pcm_hw_params *params,
  95                                  struct snd_soc_dai *cpu_dai)
  96 {
  97         struct s3c_i2sv2_info *i2s = snd_soc_dai_get_drvdata(cpu_dai);
  98         u32 iismod;
  99
 100         pr_debug("Entered %s\n", __func__);
 101
 102         iismod = readl(i2s->regs + S3C2412_IISMOD);
 103         pr_debug("%s: r: IISMOD: %x\n", __func__, iismod);
 104
 105         switch (params_width(params)) {
 106         case 8:
 107                 iismod |= S3C2412_IISMOD_8BIT;
 108                 break;
 109         case 16:
 110                 iismod &= ~S3C2412_IISMOD_8BIT;
 111                 break;
 112         }
 113
 114         writel(iismod, i2s->regs + S3C2412_IISMOD);
 115         pr_debug("%s: w: IISMOD: %x\n", __func__, iismod);
 116
 117         return 0;
 118 }
 119
 120 #define S3C2412_I2S_RATES \
 121         (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
 122         SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
 123         SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
 124
 125 static const struct snd_soc_dai_ops s3c2412_i2s_dai_ops = {
 126         .hw_params      = s3c2412_i2s_hw_params,
 127 };
 128
 129 static struct snd_soc_dai_driver s3c2412_i2s_dai = {
 130         .probe          = s3c2412_i2s_probe,
 131         .remove = s3c2412_i2s_remove,
 132         .playback = {
 133                 .channels_min   = 2,
 134                 .channels_max   = 2,
 135                 .rates          = S3C2412_I2S_RATES,
 136                 .formats        = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
 137         },
 138         .capture = {
 139                 .channels_min   = 2,
 140                 .channels_max   = 2,
 141                 .rates          = S3C2412_I2S_RATES,
 142                 .formats        = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
 143         },
 144         .ops = &s3c2412_i2s_dai_ops,
 145 };
 146
 147 static const struct snd_soc_component_driver s3c2412_i2s_component = {
 148         .name           = "s3c2412-i2s",
 149 };
 150
 151 static int s3c2412_iis_dev_probe(struct platform_device *pdev)
 152 {
 153         int ret = 0;
 154         struct resource *res;
 155
 156         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 157         s3c2412_i2s.regs = devm_ioremap_resource(&pdev->dev, res);
 158         if (IS_ERR(s3c2412_i2s.regs))
 159                 return PTR_ERR(s3c2412_i2s.regs);
 160
 161         s3c2412_i2s_pcm_stereo_out.dma_addr = res->start + S3C2412_IISTXD;
 162         s3c2412_i2s_pcm_stereo_in.dma_addr = res->start + S3C2412_IISRXD;
 163
 164         ret = s3c_i2sv2_register_component(&pdev->dev, -1,
 165                                            &s3c2412_i2s_component,
 166                                            &s3c2412_i2s_dai);
 167         if (ret) {
 168                 pr_err("failed to register the dai\n");
 169                 return ret;
 170         }
 171
 172         ret = samsung_asoc_dma_platform_register(&pdev->dev);
 173         if (ret)
 174                 pr_err("failed to register the DMA: %d\n", ret);
 175
 176         return ret;
 177 }
 178
 179 static struct platform_driver s3c2412_iis_driver = {
 180         .probe  = s3c2412_iis_dev_probe,
 181         .driver = {
 182                 .name = "s3c2412-iis",
 183         },
 184 };
 185
 186 module_platform_driver(s3c2412_iis_driver);
 187
 188 /* Module information */
 189 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
 190 MODULE_DESCRIPTION("S3C2412 I2S SoC Interface");
 191 MODULE_LICENSE("GPL");
 192 MODULE_ALIAS("platform:s3c2412-iis");