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_client s3c2412_dma_client_out = {
  37         .name           = "I2S PCM Stereo out"
  38 };
  39
  40 static struct s3c_dma_client s3c2412_dma_client_in = {
  41         .name           = "I2S PCM Stereo in"
  42 };
  43
  44 static struct s3c_dma_params s3c2412_i2s_pcm_stereo_out = {
  45         .client         = &s3c2412_dma_client_out,
  46         .channel        = DMACH_I2S_OUT,
  47         .dma_addr       = S3C2410_PA_IIS + S3C2412_IISTXD,
  48         .dma_size       = 4,
  49 };
  50
  51 static struct s3c_dma_params s3c2412_i2s_pcm_stereo_in = {
  52         .client         = &s3c2412_dma_client_in,
  53         .channel        = DMACH_I2S_IN,
  54         .dma_addr       = S3C2410_PA_IIS + S3C2412_IISRXD,
  55         .dma_size       = 4,
  56 };
  57
  58 static struct s3c_i2sv2_info s3c2412_i2s;
  59
  60 static int s3c2412_i2s_probe(struct snd_soc_dai *dai)
  61 {
  62         int ret;
  63
  64         pr_debug("Entered %s\n", __func__);
  65
  66         ret = s3c_i2sv2_probe(dai, &s3c2412_i2s, S3C2410_PA_IIS);
  67         if (ret)
  68                 return ret;
  69
  70         s3c2412_i2s.dma_capture = &s3c2412_i2s_pcm_stereo_in;
  71         s3c2412_i2s.dma_playback = &s3c2412_i2s_pcm_stereo_out;
  72
  73         s3c2412_i2s.iis_cclk = clk_get(dai->dev, "i2sclk");
  74         if (IS_ERR(s3c2412_i2s.iis_cclk)) {
  75                 pr_err("failed to get i2sclk clock\n");
  76                 iounmap(s3c2412_i2s.regs);
  77                 return PTR_ERR(s3c2412_i2s.iis_cclk);
  78         }
  79
  80         /* Set MPLL as the source for IIS CLK */
  81
  82         clk_set_parent(s3c2412_i2s.iis_cclk, clk_get(NULL, "mpll"));
  83         clk_enable(s3c2412_i2s.iis_cclk);
  84
  85         s3c2412_i2s.iis_cclk = s3c2412_i2s.iis_pclk;
  86
  87         /* Configure the I2S pins (GPE0...GPE4) in correct mode */
  88         s3c_gpio_cfgall_range(S3C2410_GPE(0), 5, S3C_GPIO_SFN(2),
  89                               S3C_GPIO_PULL_NONE);
  90
  91         return 0;
  92 }
  93
  94 static int s3c2412_i2s_remove(struct snd_soc_dai *dai)
  95 {
  96         clk_disable(s3c2412_i2s.iis_cclk);
  97         clk_put(s3c2412_i2s.iis_cclk);
  98         iounmap(s3c2412_i2s.regs);
  99
 100         return 0;
 101 }
 102
 103 static int s3c2412_i2s_hw_params(struct snd_pcm_substream *substream,
 104                                  struct snd_pcm_hw_params *params,
 105                                  struct snd_soc_dai *cpu_dai)
 106 {
 107         struct s3c_i2sv2_info *i2s = snd_soc_dai_get_drvdata(cpu_dai);
 108         struct s3c_dma_params *dma_data;
 109         u32 iismod;
 110
 111         pr_debug("Entered %s\n", __func__);
 112
 113         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 114                 dma_data = i2s->dma_playback;
 115         else
 116                 dma_data = i2s->dma_capture;
 117
 118         snd_soc_dai_set_dma_data(cpu_dai, substream, dma_data);
 119
 120         iismod = readl(i2s->regs + S3C2412_IISMOD);
 121         pr_debug("%s: r: IISMOD: %x\n", __func__, iismod);
 122
 123         switch (params_width(params)) {
 124         case 8:
 125                 iismod |= S3C2412_IISMOD_8BIT;
 126                 break;
 127         case 16:
 128                 iismod &= ~S3C2412_IISMOD_8BIT;
 129                 break;
 130         }
 131
 132         writel(iismod, i2s->regs + S3C2412_IISMOD);
 133         pr_debug("%s: w: IISMOD: %x\n", __func__, iismod);
 134
 135         return 0;
 136 }
 137
 138 #define S3C2412_I2S_RATES \
 139         (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
 140         SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
 141         SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
 142
 143 static const struct snd_soc_dai_ops s3c2412_i2s_dai_ops = {
 144         .hw_params      = s3c2412_i2s_hw_params,
 145 };
 146
 147 static struct snd_soc_dai_driver s3c2412_i2s_dai = {
 148         .probe          = s3c2412_i2s_probe,
 149         .remove = s3c2412_i2s_remove,
 150         .playback = {
 151                 .channels_min   = 2,
 152                 .channels_max   = 2,
 153                 .rates          = S3C2412_I2S_RATES,
 154                 .formats        = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
 155         },
 156         .capture = {
 157                 .channels_min   = 2,
 158                 .channels_max   = 2,
 159                 .rates          = S3C2412_I2S_RATES,
 160                 .formats        = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
 161         },
 162         .ops = &s3c2412_i2s_dai_ops,
 163 };
 164
 165 static const struct snd_soc_component_driver s3c2412_i2s_component = {
 166         .name           = "s3c2412-i2s",
 167 };
 168
 169 static int s3c2412_iis_dev_probe(struct platform_device *pdev)
 170 {
 171         int ret = 0;
 172
 173         ret = s3c_i2sv2_register_component(&pdev->dev, -1,
 174                                            &s3c2412_i2s_component,
 175                                            &s3c2412_i2s_dai);
 176         if (ret) {
 177                 pr_err("failed to register the dai\n");
 178                 return ret;
 179         }
 180
 181         ret = samsung_asoc_dma_platform_register(&pdev->dev);
 182         if (ret)
 183                 pr_err("failed to register the DMA: %d\n", ret);
 184
 185         return ret;
 186 }
 187
 188 static struct platform_driver s3c2412_iis_driver = {
 189         .probe  = s3c2412_iis_dev_probe,
 190         .driver = {
 191                 .name = "s3c2412-iis",
 192                 .owner = THIS_MODULE,
 193         },
 194 };
 195
 196 module_platform_driver(s3c2412_iis_driver);
 197
 198 /* Module information */
 199 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
 200 MODULE_DESCRIPTION("S3C2412 I2S SoC Interface");
 201 MODULE_LICENSE("GPL");
 202 MODULE_ALIAS("platform:s3c2412-iis");