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s3c2412-i2s.c

/* sound/soc/s3c24xx/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/init.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/clk.h>
#include <linux/kernel.h>
#include <linux/io.h>

#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/initval.h>
#include <sound/soc.h>
#include <mach/hardware.h>

#include <plat/regs-s3c2412-iis.h>

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

#include "s3c24xx-pcm.h"
#include "s3c2412-i2s.h"

#define S3C2412_I2S_DEBUG 0

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 s3c24xx_pcm_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 s3c24xx_pcm_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;

/*
 * Set S3C2412 Clock source
 */
static int s3c2412_i2s_set_sysclk(struct snd_soc_dai *cpu_dai,
                          int clk_id, unsigned int freq, int dir)
{
      u32 iismod = readl(s3c2412_i2s.regs + S3C2412_IISMOD);

      pr_debug("%s(%p, %d, %u, %d)\n", __func__, cpu_dai, clk_id,
          freq, dir);

      switch (clk_id) {
      case S3C2412_CLKSRC_PCLK:
            s3c2412_i2s.master = 1;
            iismod &= ~S3C2412_IISMOD_MASTER_MASK;
            iismod |= S3C2412_IISMOD_MASTER_INTERNAL;
            break;
      case S3C2412_CLKSRC_I2SCLK:
            s3c2412_i2s.master = 0;
            iismod &= ~S3C2412_IISMOD_MASTER_MASK;
            iismod |= S3C2412_IISMOD_MASTER_EXTERNAL;
            break;
      default:
            return -EINVAL;
      }

      writel(iismod, s3c2412_i2s.regs + S3C2412_IISMOD);
      return 0;
}


struct clk *s3c2412_get_iisclk(void)
{
      return s3c2412_i2s.iis_clk;
}
EXPORT_SYMBOL_GPL(s3c2412_get_iisclk);


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

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

      ret = s3c_i2sv2_probe(pdev, 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(&pdev->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;
}

#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 = {
      .set_sysclk = s3c2412_i2s_set_sysclk,
};

struct snd_soc_dai s3c2412_i2s_dai = {
      .name       = "s3c2412-i2s",
      .id         = 0,
      .probe            = s3c2412_i2s_probe,
      .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,
};
EXPORT_SYMBOL_GPL(s3c2412_i2s_dai);

static int __init s3c2412_i2s_init(void)
{
      return  s3c_i2sv2_register_dai(&s3c2412_i2s_dai);
}
module_init(s3c2412_i2s_init);

static void __exit s3c2412_i2s_exit(void)
{
      snd_soc_unregister_dai(&s3c2412_i2s_dai);
}
module_exit(s3c2412_i2s_exit);

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

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