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mx27vis_wm8974.c

/*
 * mx27vis_wm8974.c  --  SoC audio for mx27vis
 *
 * Copyright 2009 Vista Silicon S.L.
 * Author: Javier Martin
 *         javier.martin@vista-silicon.com
 *
 *  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/module.h>
#include <linux/moduleparam.h>
#include <linux/device.h>
#include <linux/i2c.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/soc.h>
#include <sound/soc-dapm.h>


#include "../codecs/wm8974.h"
#include "mx1_mx2-pcm.h"
#include "mxc-ssi.h"
#include <mach/gpio.h>
#include <mach/iomux.h>

#define IGNORED_ARG 0


static struct snd_soc_card mx27vis;

/**
  * This function connects SSI1 (HPCR1) as slave to
  * SSI1 external signals (PPCR1)
  * As slave, HPCR1 must set TFSDIR and TCLKDIR as inputs from
  * port 4
  */
void audmux_connect_1_4(void)
{
      pr_debug("AUDMUX: normal operation mode\n");
      /* Reset HPCR1 and PPCR1 */

      DAM_HPCR1 = 0x00000000;
      DAM_PPCR1 = 0x00000000;

      /* set to synchronous */
      DAM_HPCR1 |= AUDMUX_HPCR_SYN;
      DAM_PPCR1 |= AUDMUX_PPCR_SYN;


      /* set Rx sources 1 <--> 4 */
      DAM_HPCR1 |= AUDMUX_HPCR_RXDSEL(3); /* port 4 */
      DAM_PPCR1 |= AUDMUX_PPCR_RXDSEL(0); /* port 1 */

      /* set Tx frame and Clock direction and source  4 --> 1 output */
      DAM_HPCR1 |= AUDMUX_HPCR_TFSDIR | AUDMUX_HPCR_TCLKDIR;
      DAM_HPCR1 |= AUDMUX_HPCR_TFCSEL(3); /* TxDS and TxCclk from port 4 */

      return;
}

static int mx27vis_hifi_hw_params(struct snd_pcm_substream *substream,
      struct snd_pcm_hw_params *params)
{
      struct snd_soc_pcm_runtime *rtd = substream->private_data;
      struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;
      struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
      unsigned int pll_out = 0, bclk = 0, fmt = 0, mclk = 0;
      int ret = 0;

      /*
       * The WM8974 is better at generating accurate audio clocks than the
       * MX27 SSI controller, so we will use it as master when we can.
       */
      switch (params_rate(params)) {
      case 8000:
            fmt = SND_SOC_DAIFMT_CBM_CFM;
            mclk = WM8974_MCLKDIV_12;
            pll_out = 24576000;
            break;
      case 16000:
            fmt = SND_SOC_DAIFMT_CBM_CFM;
            pll_out = 12288000;
            break;
      case 48000:
            fmt = SND_SOC_DAIFMT_CBM_CFM;
            bclk = WM8974_BCLKDIV_4;
            pll_out = 12288000;
            break;
      case 96000:
            fmt = SND_SOC_DAIFMT_CBM_CFM;
            bclk = WM8974_BCLKDIV_2;
            pll_out = 12288000;
            break;
      case 11025:
            fmt = SND_SOC_DAIFMT_CBM_CFM;
            bclk = WM8974_BCLKDIV_16;
            pll_out = 11289600;
            break;
      case 22050:
            fmt = SND_SOC_DAIFMT_CBM_CFM;
            bclk = WM8974_BCLKDIV_8;
            pll_out = 11289600;
            break;
      case 44100:
            fmt = SND_SOC_DAIFMT_CBM_CFM;
            bclk = WM8974_BCLKDIV_4;
            mclk = WM8974_MCLKDIV_2;
            pll_out = 11289600;
            break;
      case 88200:
            fmt = SND_SOC_DAIFMT_CBM_CFM;
            bclk = WM8974_BCLKDIV_2;
            pll_out = 11289600;
            break;
      }

      /* set codec DAI configuration */
      ret = codec_dai->ops->set_fmt(codec_dai,
            SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_IF |
            SND_SOC_DAIFMT_SYNC | fmt);
      if (ret < 0) {
            printk(KERN_ERR "Error from codec DAI configuration\n");
            return ret;
      }

      /* set cpu DAI configuration */
      ret = cpu_dai->ops->set_fmt(cpu_dai,
            SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
            SND_SOC_DAIFMT_SYNC | fmt);
      if (ret < 0) {
            printk(KERN_ERR "Error from cpu DAI configuration\n");
            return ret;
      }

      /* Put DC field of STCCR to 1 (not zero) */
      ret = cpu_dai->ops->set_tdm_slot(cpu_dai, 0, 2);

      /* set the SSI system clock as input */
      ret = cpu_dai->ops->set_sysclk(cpu_dai, IMX_SSP_SYS_CLK, 0,
            SND_SOC_CLOCK_IN);
      if (ret < 0) {
            printk(KERN_ERR "Error when setting system SSI clk\n");
            return ret;
      }

      /* set codec BCLK division for sample rate */
      ret = codec_dai->ops->set_clkdiv(codec_dai, WM8974_BCLKDIV, bclk);
      if (ret < 0) {
            printk(KERN_ERR "Error when setting BCLK division\n");
            return ret;
      }


      /* codec PLL input is 25 MHz */
      ret = codec_dai->ops->set_pll(codec_dai, IGNORED_ARG,
                              25000000, pll_out);
      if (ret < 0) {
            printk(KERN_ERR "Error when setting PLL input\n");
            return ret;
      }

      /*set codec MCLK division for sample rate */
      ret = codec_dai->ops->set_clkdiv(codec_dai, WM8974_MCLKDIV, mclk);
      if (ret < 0) {
            printk(KERN_ERR "Error when setting MCLK division\n");
            return ret;
      }

      return 0;
}

static int mx27vis_hifi_hw_free(struct snd_pcm_substream *substream)
{
      struct snd_soc_pcm_runtime *rtd = substream->private_data;
      struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;

      /* disable the PLL */
      return codec_dai->ops->set_pll(codec_dai, IGNORED_ARG, 0, 0);
}

/*
 * mx27vis WM8974 HiFi DAI opserations.
 */
static struct snd_soc_ops mx27vis_hifi_ops = {
      .hw_params = mx27vis_hifi_hw_params,
      .hw_free = mx27vis_hifi_hw_free,
};


static int mx27vis_suspend(struct platform_device *pdev, pm_message_t state)
{
      return 0;
}

static int mx27vis_resume(struct platform_device *pdev)
{
      return 0;
}

static int mx27vis_probe(struct platform_device *pdev)
{
      int ret = 0;

      ret = get_ssi_clk(0, &pdev->dev);

      if (ret < 0) {
            printk(KERN_ERR "%s: cant get ssi clock\n", __func__);
            return ret;
      }


      return 0;
}

static int mx27vis_remove(struct platform_device *pdev)
{
      put_ssi_clk(0);
      return 0;
}

static struct snd_soc_dai_link mx27vis_dai[] = {
{ /* Hifi Playback*/
      .name = "WM8974",
      .stream_name = "WM8974 HiFi",
      .cpu_dai = &imx_ssi_pcm_dai[0],
      .codec_dai = &wm8974_dai,
      .ops = &mx27vis_hifi_ops,
},
};

static struct snd_soc_card mx27vis = {
      .name = "mx27vis",
      .platform = &mx1_mx2_soc_platform,
      .probe = mx27vis_probe,
      .remove = mx27vis_remove,
      .suspend_pre = mx27vis_suspend,
      .resume_post = mx27vis_resume,
      .dai_link = mx27vis_dai,
      .num_links = ARRAY_SIZE(mx27vis_dai),
};

static struct snd_soc_device mx27vis_snd_devdata = {
      .card = &mx27vis,
      .codec_dev = &soc_codec_dev_wm8974,
};

static struct platform_device *mx27vis_snd_device;

/* Temporal definition of board specific behaviour */
void gpio_ssi_active(int ssi_num)
{
      int ret = 0;

      unsigned int ssi1_pins[] = {
            PC20_PF_SSI1_FS,
            PC21_PF_SSI1_RXD,
            PC22_PF_SSI1_TXD,
            PC23_PF_SSI1_CLK,
      };
      unsigned int ssi2_pins[] = {
            PC24_PF_SSI2_FS,
            PC25_PF_SSI2_RXD,
            PC26_PF_SSI2_TXD,
            PC27_PF_SSI2_CLK,
      };
      if (ssi_num == 0)
            ret = mxc_gpio_setup_multiple_pins(ssi1_pins,
                        ARRAY_SIZE(ssi1_pins), "USB OTG");
      else
            ret = mxc_gpio_setup_multiple_pins(ssi2_pins,
                        ARRAY_SIZE(ssi2_pins), "USB OTG");
      if (ret)
            printk(KERN_ERR "Error requesting ssi %x pins\n", ssi_num);
}


static int __init mx27vis_init(void)
{
      int ret;

      mx27vis_snd_device = platform_device_alloc("soc-audio", -1);
      if (!mx27vis_snd_device)
            return -ENOMEM;

      platform_set_drvdata(mx27vis_snd_device, &mx27vis_snd_devdata);
      mx27vis_snd_devdata.dev = &mx27vis_snd_device->dev;
      ret = platform_device_add(mx27vis_snd_device);

      if (ret) {
            printk(KERN_ERR "ASoC: Platform device allocation failed\n");
            platform_device_put(mx27vis_snd_device);
      }

      /* WM8974 uses SSI1 (HPCR1) via AUDMUX port 4 for audio (PPCR1) */
      gpio_ssi_active(0);
      audmux_connect_1_4();

      return ret;
}

static void __exit mx27vis_exit(void)
{
      /* We should call some "ssi_gpio_inactive()" properly */
}

module_init(mx27vis_init);
module_exit(mx27vis_exit);


MODULE_AUTHOR("Javier Martin, javier.martin@vista-silicon.com");
MODULE_DESCRIPTION("ALSA SoC WM8974 mx27vis");
MODULE_LICENSE("GPL");

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