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s3c2412-i2s.c

/* sound/soc/samsung/s3c2412-i2s.c
 *
 * ALSA Soc Audio Layer - S3C2412 I2S driver
 *
 * Copyright (c) 2006 Wolfson Microelectronics PLC.
 *    Graeme Gregory graeme.gregory@wolfsonmicro.com
 *    linux@wolfsonmicro.com
 *
 * Copyright (c) 2007, 2004-2005 Simtec Electronics
 *    http://armlinux.simtec.co.uk/
 *    Ben Dooks <ben@simtec.co.uk>
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */

#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/clk.h>
#include <linux/io.h>

#include <sound/soc.h>
#include <sound/pcm_params.h>

#include <mach/regs-gpio.h>
#include <mach/dma.h>

#include "dma.h"
#include "regs-i2s-v2.h"
#include "s3c2412-i2s.h"

static struct s3c2410_dma_client s3c2412_dma_client_out = {
      .name       = "I2S PCM Stereo out"
};

static struct s3c2410_dma_client s3c2412_dma_client_in = {
      .name       = "I2S PCM Stereo in"
};

static struct s3c_dma_params s3c2412_i2s_pcm_stereo_out = {
      .client           = &s3c2412_dma_client_out,
      .channel    = DMACH_I2S_OUT,
      .dma_addr   = S3C2410_PA_IIS + S3C2412_IISTXD,
      .dma_size   = 4,
};

static struct s3c_dma_params s3c2412_i2s_pcm_stereo_in = {
      .client           = &s3c2412_dma_client_in,
      .channel    = DMACH_I2S_IN,
      .dma_addr   = S3C2410_PA_IIS + S3C2412_IISRXD,
      .dma_size   = 4,
};

static struct s3c_i2sv2_info s3c2412_i2s;

static int s3c2412_i2s_probe(struct snd_soc_dai *dai)
{
      int ret;

      pr_debug("Entered %s\n", __func__);

      ret = s3c_i2sv2_probe(dai, &s3c2412_i2s, S3C2410_PA_IIS);
      if (ret)
            return ret;

      s3c2412_i2s.dma_capture = &s3c2412_i2s_pcm_stereo_in;
      s3c2412_i2s.dma_playback = &s3c2412_i2s_pcm_stereo_out;

      s3c2412_i2s.iis_cclk = clk_get(dai->dev, "i2sclk");
      if (s3c2412_i2s.iis_cclk == NULL) {
            pr_err("failed to get i2sclk clock\n");
            iounmap(s3c2412_i2s.regs);
            return -ENODEV;
      }

      /* Set MPLL as the source for IIS CLK */

      clk_set_parent(s3c2412_i2s.iis_cclk, clk_get(NULL, "mpll"));
      clk_enable(s3c2412_i2s.iis_cclk);

      s3c2412_i2s.iis_cclk = s3c2412_i2s.iis_pclk;

      /* Configure the I2S pins in correct mode */
      s3c2410_gpio_cfgpin(S3C2410_GPE0, S3C2410_GPE0_I2SLRCK);
      s3c2410_gpio_cfgpin(S3C2410_GPE1, S3C2410_GPE1_I2SSCLK);
      s3c2410_gpio_cfgpin(S3C2410_GPE2, S3C2410_GPE2_CDCLK);
      s3c2410_gpio_cfgpin(S3C2410_GPE3, S3C2410_GPE3_I2SSDI);
      s3c2410_gpio_cfgpin(S3C2410_GPE4, S3C2410_GPE4_I2SSDO);

      return 0;
}

static int s3c2412_i2s_remove(struct snd_soc_dai *dai)
{
      clk_disable(s3c2412_i2s.iis_cclk);
      clk_put(s3c2412_i2s.iis_cclk);
      iounmap(s3c2412_i2s.regs);

      return 0;
}

static int s3c2412_i2s_hw_params(struct snd_pcm_substream *substream,
                         struct snd_pcm_hw_params *params,
                         struct snd_soc_dai *cpu_dai)
{
      struct s3c_i2sv2_info *i2s = snd_soc_dai_get_drvdata(cpu_dai);
      struct s3c_dma_params *dma_data;
      u32 iismod;

      pr_debug("Entered %s\n", __func__);

      if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
            dma_data = i2s->dma_playback;
      else
            dma_data = i2s->dma_capture;

      snd_soc_dai_set_dma_data(cpu_dai, substream, dma_data);

      iismod = readl(i2s->regs + S3C2412_IISMOD);
      pr_debug("%s: r: IISMOD: %x\n", __func__, iismod);

      switch (params_format(params)) {
      case SNDRV_PCM_FORMAT_S8:
            iismod |= S3C2412_IISMOD_8BIT;
            break;
      case SNDRV_PCM_FORMAT_S16_LE:
            iismod &= ~S3C2412_IISMOD_8BIT;
            break;
      }

      writel(iismod, i2s->regs + S3C2412_IISMOD);
      pr_debug("%s: w: IISMOD: %x\n", __func__, iismod);

      return 0;
}

#define S3C2412_I2S_RATES \
      (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
      SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
      SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)

static struct snd_soc_dai_ops s3c2412_i2s_dai_ops = {
      .hw_params  = s3c2412_i2s_hw_params,
};

static struct snd_soc_dai_driver s3c2412_i2s_dai = {
      .probe            = s3c2412_i2s_probe,
      .remove     = s3c2412_i2s_remove,
      .playback = {
            .channels_min     = 2,
            .channels_max     = 2,
            .rates            = S3C2412_I2S_RATES,
            .formats    = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
      },
      .capture = {
            .channels_min     = 2,
            .channels_max     = 2,
            .rates            = S3C2412_I2S_RATES,
            .formats    = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
      },
      .ops = &s3c2412_i2s_dai_ops,
};

static __devinit int s3c2412_iis_dev_probe(struct platform_device *pdev)
{
      return snd_soc_register_dai(&pdev->dev, &s3c2412_i2s_dai);
}

static __devexit int s3c2412_iis_dev_remove(struct platform_device *pdev)
{
      snd_soc_unregister_dai(&pdev->dev);
      return 0;
}

static struct platform_driver s3c2412_iis_driver = {
      .probe  = s3c2412_iis_dev_probe,
      .remove = s3c2412_iis_dev_remove,
      .driver = {
            .name = "s3c2412-iis",
            .owner = THIS_MODULE,
      },
};

static int __init s3c2412_i2s_init(void)
{
      return platform_driver_register(&s3c2412_iis_driver);
}
module_init(s3c2412_i2s_init);

static void __exit s3c2412_i2s_exit(void)
{
      platform_driver_unregister(&s3c2412_iis_driver);
}
module_exit(s3c2412_i2s_exit);

/* Module information */
MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
MODULE_DESCRIPTION("S3C2412 I2S SoC Interface");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:s3c2412-iis");

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