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         .chan_name      = "tx",
  39         .addr_width     = 4,
  40 };
  41
  42 static struct snd_dmaengine_dai_dma_data s3c2412_i2s_pcm_stereo_in = {
  43         .chan_name      = "rx",
  44         .addr_width     = 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         snd_soc_dai_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                 ret = PTR_ERR(s3c2412_i2s.iis_cclk);
  69                 goto err;
  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         ret = clk_prepare_enable(s3c2412_i2s.iis_cclk);
  76         if (ret)
  77                 goto err;
  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 err:
  86         s3c_i2sv2_cleanup(dai, &s3c2412_i2s);
  87
  88         return ret;
  89 }
  90
  91 static int s3c2412_i2s_remove(struct snd_soc_dai *dai)
  92 {
  93         clk_disable_unprepare(s3c2412_i2s.iis_cclk);
  94         s3c_i2sv2_cleanup(dai, &s3c2412_i2s);
  95
  96         return 0;
  97 }
  98
  99 static int s3c2412_i2s_hw_params(struct snd_pcm_substream *substream,
 100                                  struct snd_pcm_hw_params *params,
 101                                  struct snd_soc_dai *cpu_dai)
 102 {
 103         struct s3c_i2sv2_info *i2s = snd_soc_dai_get_drvdata(cpu_dai);
 104         u32 iismod;
 105
 106         pr_debug("Entered %s\n", __func__);
 107
 108         iismod = readl(i2s->regs + S3C2412_IISMOD);
 109         pr_debug("%s: r: IISMOD: %x\n", __func__, iismod);
 110
 111         switch (params_width(params)) {
 112         case 8:
 113                 iismod |= S3C2412_IISMOD_8BIT;
 114                 break;
 115         case 16:
 116                 iismod &= ~S3C2412_IISMOD_8BIT;
 117                 break;
 118         }
 119
 120         writel(iismod, i2s->regs + S3C2412_IISMOD);
 121         pr_debug("%s: w: IISMOD: %x\n", __func__, iismod);
 122
 123         return 0;
 124 }
 125
 126 #define S3C2412_I2S_RATES \
 127         (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
 128         SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
 129         SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
 130
 131 static const struct snd_soc_dai_ops s3c2412_i2s_dai_ops = {
 132         .hw_params      = s3c2412_i2s_hw_params,
 133 };
 134
 135 static struct snd_soc_dai_driver s3c2412_i2s_dai = {
 136         .probe          = s3c2412_i2s_probe,
 137         .remove = s3c2412_i2s_remove,
 138         .playback = {
 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         .capture = {
 145                 .channels_min   = 2,
 146                 .channels_max   = 2,
 147                 .rates          = S3C2412_I2S_RATES,
 148                 .formats        = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
 149         },
 150         .ops = &s3c2412_i2s_dai_ops,
 151 };
 152
 153 static const struct snd_soc_component_driver s3c2412_i2s_component = {
 154         .name           = "s3c2412-i2s",
 155 };
 156
 157 static int s3c2412_iis_dev_probe(struct platform_device *pdev)
 158 {
 159         int ret = 0;
 160         struct resource *res;
 161         struct s3c_audio_pdata *pdata = dev_get_platdata(&pdev->dev);
 162
 163         if (!pdata) {
 164                 dev_err(&pdev->dev, "missing platform data");
 165                 return -ENXIO;
 166         }
 167
 168         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 169         s3c2412_i2s.regs = devm_ioremap_resource(&pdev->dev, res);
 170         if (IS_ERR(s3c2412_i2s.regs))
 171                 return PTR_ERR(s3c2412_i2s.regs);
 172
 173         s3c2412_i2s_pcm_stereo_out.addr = res->start + S3C2412_IISTXD;
 174         s3c2412_i2s_pcm_stereo_out.filter_data = pdata->dma_playback;
 175         s3c2412_i2s_pcm_stereo_in.addr = res->start + S3C2412_IISRXD;
 176         s3c2412_i2s_pcm_stereo_in.filter_data = pdata->dma_capture;
 177
 178         ret = samsung_asoc_dma_platform_register(&pdev->dev,
 179                                                  pdata->dma_filter,
 180                                                  NULL, NULL);
 181         if (ret) {
 182                 pr_err("failed to register the DMA: %d\n", ret);
 183                 return ret;
 184         }
 185
 186         ret = s3c_i2sv2_register_component(&pdev->dev, -1,
 187                                            &s3c2412_i2s_component,
 188                                            &s3c2412_i2s_dai);
 189         if (ret)
 190                 pr_err("failed to register the dai\n");
 191
 192         return ret;
 193 }
 194
 195 static struct platform_driver s3c2412_iis_driver = {
 196         .probe  = s3c2412_iis_dev_probe,
 197         .driver = {
 198                 .name = "s3c2412-iis",
 199         },
 200 };
 201
 202 module_platform_driver(s3c2412_iis_driver);
 203
 204 /* Module information */
 205 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
 206 MODULE_DESCRIPTION("S3C2412 I2S SoC Interface");
 207 MODULE_LICENSE("GPL");
 208 MODULE_ALIAS("platform:s3c2412-iis");