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 s3c_dma_params s3c2412_i2s_pcm_stereo_out = {
  38         .ch_name        = "tx",
  39         .dma_size       = 4,
  40 };
  41
  42 static struct s3c_dma_params s3c2412_i2s_pcm_stereo_in = {
  43         .ch_name        = "rx",
  44         .dma_size       = 4,
  45 };
  46
  47 static struct s3c_i2sv2_info s3c2412_i2s;
  48
  49 static int s3c2412_i2s_probe(struct snd_soc_dai *dai)
  50 {
  51         int ret;
  52
  53         pr_debug("Entered %s\n", __func__);
  54
  55         samsung_asoc_init_dma_data(dai, &s3c2412_i2s_pcm_stereo_out,
  56                 &s3c2412_i2s_pcm_stereo_in);
  57
  58         ret = s3c_i2sv2_probe(dai, &s3c2412_i2s, S3C2410_PA_IIS);
  59         if (ret)
  60                 return ret;
  61
  62         s3c2412_i2s.dma_capture = &s3c2412_i2s_pcm_stereo_in;
  63         s3c2412_i2s.dma_playback = &s3c2412_i2s_pcm_stereo_out;
  64
  65         s3c2412_i2s.iis_cclk = devm_clk_get(dai->dev, "i2sclk");
  66         if (IS_ERR(s3c2412_i2s.iis_cclk)) {
  67                 pr_err("failed to get i2sclk clock\n");
  68                 return PTR_ERR(s3c2412_i2s.iis_cclk);
  69         }
  70
  71         /* Set MPLL as the source for IIS CLK */
  72
  73         clk_set_parent(s3c2412_i2s.iis_cclk, clk_get(NULL, "mpll"));
  74         clk_prepare_enable(s3c2412_i2s.iis_cclk);
  75
  76         s3c2412_i2s.iis_cclk = s3c2412_i2s.iis_pclk;
  77
  78         /* Configure the I2S pins (GPE0...GPE4) in correct mode */
  79         s3c_gpio_cfgall_range(S3C2410_GPE(0), 5, S3C_GPIO_SFN(2),
  80                               S3C_GPIO_PULL_NONE);
  81
  82         return 0;
  83 }
  84
  85 static int s3c2412_i2s_remove(struct snd_soc_dai *dai)
  86 {
  87         clk_disable_unprepare(s3c2412_i2s.iis_cclk);
  88
  89         return 0;
  90 }
  91
  92 static int s3c2412_i2s_hw_params(struct snd_pcm_substream *substream,
  93                                  struct snd_pcm_hw_params *params,
  94                                  struct snd_soc_dai *cpu_dai)
  95 {
  96         struct s3c_i2sv2_info *i2s = snd_soc_dai_get_drvdata(cpu_dai);
  97         u32 iismod;
  98
  99         pr_debug("Entered %s\n", __func__);
 100
 101         iismod = readl(i2s->regs + S3C2412_IISMOD);
 102         pr_debug("%s: r: IISMOD: %x\n", __func__, iismod);
 103
 104         switch (params_width(params)) {
 105         case 8:
 106                 iismod |= S3C2412_IISMOD_8BIT;
 107                 break;
 108         case 16:
 109                 iismod &= ~S3C2412_IISMOD_8BIT;
 110                 break;
 111         }
 112
 113         writel(iismod, i2s->regs + S3C2412_IISMOD);
 114         pr_debug("%s: w: IISMOD: %x\n", __func__, iismod);
 115
 116         return 0;
 117 }
 118
 119 #define S3C2412_I2S_RATES \
 120         (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
 121         SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
 122         SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
 123
 124 static const struct snd_soc_dai_ops s3c2412_i2s_dai_ops = {
 125         .hw_params      = s3c2412_i2s_hw_params,
 126 };
 127
 128 static struct snd_soc_dai_driver s3c2412_i2s_dai = {
 129         .probe          = s3c2412_i2s_probe,
 130         .remove = s3c2412_i2s_remove,
 131         .playback = {
 132                 .channels_min   = 2,
 133                 .channels_max   = 2,
 134                 .rates          = S3C2412_I2S_RATES,
 135                 .formats        = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
 136         },
 137         .capture = {
 138                 .channels_min   = 2,
 139                 .channels_max   = 2,
 140                 .rates          = S3C2412_I2S_RATES,
 141                 .formats        = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
 142         },
 143         .ops = &s3c2412_i2s_dai_ops,
 144 };
 145
 146 static const struct snd_soc_component_driver s3c2412_i2s_component = {
 147         .name           = "s3c2412-i2s",
 148 };
 149
 150 static int s3c2412_iis_dev_probe(struct platform_device *pdev)
 151 {
 152         int ret = 0;
 153         struct resource *res;
 154         struct s3c_audio_pdata *pdata = dev_get_platdata(&pdev->dev);
 155
 156         if (!pdata) {
 157                 dev_err(&pdev->dev, "missing platform data");
 158                 return -ENXIO;
 159         }
 160
 161         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 162         s3c2412_i2s.regs = devm_ioremap_resource(&pdev->dev, res);
 163         if (IS_ERR(s3c2412_i2s.regs))
 164                 return PTR_ERR(s3c2412_i2s.regs);
 165
 166         s3c2412_i2s_pcm_stereo_out.dma_addr = res->start + S3C2412_IISTXD;
 167         s3c2412_i2s_pcm_stereo_out.slave = pdata->dma_playback;
 168         s3c2412_i2s_pcm_stereo_in.dma_addr = res->start + S3C2412_IISRXD;
 169         s3c2412_i2s_pcm_stereo_in.slave = pdata->dma_capture;
 170
 171         ret = s3c_i2sv2_register_component(&pdev->dev, -1,
 172                                            &s3c2412_i2s_component,
 173                                            &s3c2412_i2s_dai);
 174         if (ret) {
 175                 pr_err("failed to register the dai\n");
 176                 return ret;
 177         }
 178
 179         ret = samsung_asoc_dma_platform_register(&pdev->dev,
 180                                                  pdata->dma_filter,
 181                                                  NULL, NULL);
 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         },
 193 };
 194
 195 module_platform_driver(s3c2412_iis_driver);
 196
 197 /* Module information */
 198 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
 199 MODULE_DESCRIPTION("S3C2412 I2S SoC Interface");
 200 MODULE_LICENSE("GPL");
 201 MODULE_ALIAS("platform:s3c2412-iis");