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kirkwood-i2s.c

/*
 * kirkwood-i2s.c
 *
 * (c) 2010 Arnaud Patard <apatard@mandriva.com>
 * (c) 2010 Arnaud Patard <arnaud.patard@rtp-net.org>
 *
 *  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/platform_device.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/mbus.h>
#include <linux/delay.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <plat/audio.h>
#include "kirkwood.h"

#define DRV_NAME  "kirkwood-i2s"

#define KIRKWOOD_I2S_RATES \
      (SNDRV_PCM_RATE_44100 | \
       SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000)
#define KIRKWOOD_I2S_FORMATS \
      (SNDRV_PCM_FMTBIT_S16_LE | \
       SNDRV_PCM_FMTBIT_S24_LE | \
       SNDRV_PCM_FMTBIT_S32_LE)

static int kirkwood_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
            unsigned int fmt)
{
      struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(cpu_dai);
      unsigned long mask;
      unsigned long value;

      switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
      case SND_SOC_DAIFMT_RIGHT_J:
            mask = KIRKWOOD_I2S_CTL_RJ;
            break;
      case SND_SOC_DAIFMT_LEFT_J:
            mask = KIRKWOOD_I2S_CTL_LJ;
            break;
      case SND_SOC_DAIFMT_I2S:
            mask = KIRKWOOD_I2S_CTL_I2S;
            break;
      default:
            return -EINVAL;
      }

      /*
       * Set same format for playback and record
       * This avoids some troubles.
       */
      value = readl(priv->io+KIRKWOOD_I2S_PLAYCTL);
      value &= ~KIRKWOOD_I2S_CTL_JUST_MASK;
      value |= mask;
      writel(value, priv->io+KIRKWOOD_I2S_PLAYCTL);

      value = readl(priv->io+KIRKWOOD_I2S_RECCTL);
      value &= ~KIRKWOOD_I2S_CTL_JUST_MASK;
      value |= mask;
      writel(value, priv->io+KIRKWOOD_I2S_RECCTL);

      return 0;
}

static inline void kirkwood_set_dco(void __iomem *io, unsigned long rate)
{
      unsigned long value;

      value = KIRKWOOD_DCO_CTL_OFFSET_0;
      switch (rate) {
      default:
      case 44100:
            value |= KIRKWOOD_DCO_CTL_FREQ_11;
            break;
      case 48000:
            value |= KIRKWOOD_DCO_CTL_FREQ_12;
            break;
      case 96000:
            value |= KIRKWOOD_DCO_CTL_FREQ_24;
            break;
      }
      writel(value, io + KIRKWOOD_DCO_CTL);

      /* wait for dco locked */
      do {
            cpu_relax();
            value = readl(io + KIRKWOOD_DCO_SPCR_STATUS);
            value &= KIRKWOOD_DCO_SPCR_STATUS;
      } while (value == 0);
}

static int kirkwood_i2s_startup(struct snd_pcm_substream *substream,
            struct snd_soc_dai *dai)
{
      struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);

      snd_soc_dai_set_dma_data(dai, substream, priv);
      return 0;
}

static int kirkwood_i2s_hw_params(struct snd_pcm_substream *substream,
                         struct snd_pcm_hw_params *params,
                         struct snd_soc_dai *dai)
{
      struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
      unsigned int i2s_reg, reg;
      unsigned long i2s_value, value;

      if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
            i2s_reg = KIRKWOOD_I2S_PLAYCTL;
            reg = KIRKWOOD_PLAYCTL;
      } else {
            i2s_reg = KIRKWOOD_I2S_RECCTL;
            reg = KIRKWOOD_RECCTL;
      }

      /* set dco conf */
      kirkwood_set_dco(priv->io, params_rate(params));

      i2s_value = readl(priv->io+i2s_reg);
      i2s_value &= ~KIRKWOOD_I2S_CTL_SIZE_MASK;

      value = readl(priv->io+reg);
      value &= ~KIRKWOOD_PLAYCTL_SIZE_MASK;

      /*
       * Size settings in play/rec i2s control regs and play/rec control
       * regs must be the same.
       */
      switch (params_format(params)) {
      case SNDRV_PCM_FORMAT_S16_LE:
            i2s_value |= KIRKWOOD_I2S_CTL_SIZE_16;
            value |= KIRKWOOD_PLAYCTL_SIZE_16_C;
            break;
      /*
       * doesn't work... S20_3LE != kirkwood 20bit format ?
       *
      case SNDRV_PCM_FORMAT_S20_3LE:
            i2s_value |= KIRKWOOD_I2S_CTL_SIZE_20;
            value |= KIRKWOOD_PLAYCTL_SIZE_20;
            break;
      */
      case SNDRV_PCM_FORMAT_S24_LE:
            i2s_value |= KIRKWOOD_I2S_CTL_SIZE_24;
            value |= KIRKWOOD_PLAYCTL_SIZE_24;
            break;
      case SNDRV_PCM_FORMAT_S32_LE:
            i2s_value |= KIRKWOOD_I2S_CTL_SIZE_32;
            value |= KIRKWOOD_PLAYCTL_SIZE_32;
            break;
      default:
            return -EINVAL;
      }

      if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
            value &= ~KIRKWOOD_PLAYCTL_MONO_MASK;
            if (params_channels(params) == 1)
                  value |= KIRKWOOD_PLAYCTL_MONO_BOTH;
            else
                  value |= KIRKWOOD_PLAYCTL_MONO_OFF;
      }

      writel(i2s_value, priv->io+i2s_reg);
      writel(value, priv->io+reg);

      return 0;
}

static int kirkwood_i2s_play_trigger(struct snd_pcm_substream *substream,
                        int cmd, struct snd_soc_dai *dai)
{
      struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
      unsigned long value;

      /*
       * specs says KIRKWOOD_PLAYCTL must be read 2 times before
       * changing it. So read 1 time here and 1 later.
       */
      value = readl(priv->io + KIRKWOOD_PLAYCTL);

      switch (cmd) {
      case SNDRV_PCM_TRIGGER_START:
            /* stop audio, enable interrupts */
            value = readl(priv->io + KIRKWOOD_PLAYCTL);
            value |= KIRKWOOD_PLAYCTL_PAUSE;
            writel(value, priv->io + KIRKWOOD_PLAYCTL);

            value = readl(priv->io + KIRKWOOD_INT_MASK);
            value |= KIRKWOOD_INT_CAUSE_PLAY_BYTES;
            writel(value, priv->io + KIRKWOOD_INT_MASK);

            /* configure audio & enable i2s playback */
            value = readl(priv->io + KIRKWOOD_PLAYCTL);
            value &= ~KIRKWOOD_PLAYCTL_BURST_MASK;
            value &= ~(KIRKWOOD_PLAYCTL_PAUSE | KIRKWOOD_PLAYCTL_I2S_MUTE
                        | KIRKWOOD_PLAYCTL_SPDIF_EN);

            if (priv->burst == 32)
                  value |= KIRKWOOD_PLAYCTL_BURST_32;
            else
                  value |= KIRKWOOD_PLAYCTL_BURST_128;
            value |= KIRKWOOD_PLAYCTL_I2S_EN;
            writel(value, priv->io + KIRKWOOD_PLAYCTL);
            break;

      case SNDRV_PCM_TRIGGER_STOP:
            /* stop audio, disable interrupts */
            value = readl(priv->io + KIRKWOOD_PLAYCTL);
            value |= KIRKWOOD_PLAYCTL_PAUSE | KIRKWOOD_PLAYCTL_I2S_MUTE;
            writel(value, priv->io + KIRKWOOD_PLAYCTL);

            value = readl(priv->io + KIRKWOOD_INT_MASK);
            value &= ~KIRKWOOD_INT_CAUSE_PLAY_BYTES;
            writel(value, priv->io + KIRKWOOD_INT_MASK);

            /* disable all playbacks */
            value = readl(priv->io + KIRKWOOD_PLAYCTL);
            value &= ~(KIRKWOOD_PLAYCTL_I2S_EN | KIRKWOOD_PLAYCTL_SPDIF_EN);
            writel(value, priv->io + KIRKWOOD_PLAYCTL);
            break;

      case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
      case SNDRV_PCM_TRIGGER_SUSPEND:
            value = readl(priv->io + KIRKWOOD_PLAYCTL);
            value |= KIRKWOOD_PLAYCTL_PAUSE | KIRKWOOD_PLAYCTL_I2S_MUTE;
            writel(value, priv->io + KIRKWOOD_PLAYCTL);
            break;

      case SNDRV_PCM_TRIGGER_RESUME:
      case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
            value = readl(priv->io + KIRKWOOD_PLAYCTL);
            value &= ~(KIRKWOOD_PLAYCTL_PAUSE | KIRKWOOD_PLAYCTL_I2S_MUTE);
            writel(value, priv->io + KIRKWOOD_PLAYCTL);
            break;

      default:
            return -EINVAL;
      }

      return 0;
}

static int kirkwood_i2s_rec_trigger(struct snd_pcm_substream *substream,
                        int cmd, struct snd_soc_dai *dai)
{
      struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
      unsigned long value;

      value = readl(priv->io + KIRKWOOD_RECCTL);

      switch (cmd) {
      case SNDRV_PCM_TRIGGER_START:
            /* stop audio, enable interrupts */
            value = readl(priv->io + KIRKWOOD_RECCTL);
            value |= KIRKWOOD_RECCTL_PAUSE;
            writel(value, priv->io + KIRKWOOD_RECCTL);

            value = readl(priv->io + KIRKWOOD_INT_MASK);
            value |= KIRKWOOD_INT_CAUSE_REC_BYTES;
            writel(value, priv->io + KIRKWOOD_INT_MASK);

            /* configure audio & enable i2s record */
            value = readl(priv->io + KIRKWOOD_RECCTL);
            value &= ~KIRKWOOD_RECCTL_BURST_MASK;
            value &= ~KIRKWOOD_RECCTL_MONO;
            value &= ~(KIRKWOOD_RECCTL_PAUSE | KIRKWOOD_RECCTL_MUTE
                  | KIRKWOOD_RECCTL_SPDIF_EN);

            if (priv->burst == 32)
                  value |= KIRKWOOD_RECCTL_BURST_32;
            else
                  value |= KIRKWOOD_RECCTL_BURST_128;
            value |= KIRKWOOD_RECCTL_I2S_EN;

            writel(value, priv->io + KIRKWOOD_RECCTL);
            break;

      case SNDRV_PCM_TRIGGER_STOP:
            /* stop audio, disable interrupts */
            value = readl(priv->io + KIRKWOOD_RECCTL);
            value |= KIRKWOOD_RECCTL_PAUSE | KIRKWOOD_RECCTL_MUTE;
            writel(value, priv->io + KIRKWOOD_RECCTL);

            value = readl(priv->io + KIRKWOOD_INT_MASK);
            value &= ~KIRKWOOD_INT_CAUSE_REC_BYTES;
            writel(value, priv->io + KIRKWOOD_INT_MASK);

            /* disable all records */
            value = readl(priv->io + KIRKWOOD_RECCTL);
            value &= ~(KIRKWOOD_RECCTL_I2S_EN | KIRKWOOD_RECCTL_SPDIF_EN);
            writel(value, priv->io + KIRKWOOD_RECCTL);
            break;

      case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
      case SNDRV_PCM_TRIGGER_SUSPEND:
            value = readl(priv->io + KIRKWOOD_RECCTL);
            value |= KIRKWOOD_RECCTL_PAUSE | KIRKWOOD_RECCTL_MUTE;
            writel(value, priv->io + KIRKWOOD_RECCTL);
            break;

      case SNDRV_PCM_TRIGGER_RESUME:
      case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
            value = readl(priv->io + KIRKWOOD_RECCTL);
            value &= ~(KIRKWOOD_RECCTL_PAUSE | KIRKWOOD_RECCTL_MUTE);
            writel(value, priv->io + KIRKWOOD_RECCTL);
            break;

      default:
            return -EINVAL;
      }

      return 0;
}

static int kirkwood_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
                         struct snd_soc_dai *dai)
{
      if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
            return kirkwood_i2s_play_trigger(substream, cmd, dai);
      else
            return kirkwood_i2s_rec_trigger(substream, cmd, dai);

      return 0;
}

static int kirkwood_i2s_probe(struct snd_soc_dai *dai)
{
      struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
      unsigned long value;
      unsigned int reg_data;

      /* put system in a "safe" state : */
      /* disable audio interrupts */
      writel(0xffffffff, priv->io + KIRKWOOD_INT_CAUSE);
      writel(0, priv->io + KIRKWOOD_INT_MASK);

      reg_data = readl(priv->io + 0x1200);
      reg_data &= (~(0x333FF8));
      reg_data |= 0x111D18;
      writel(reg_data, priv->io + 0x1200);

      msleep(500);

      reg_data = readl(priv->io + 0x1200);
      reg_data &= (~(0x333FF8));
      reg_data |= 0x111D18;
      writel(reg_data, priv->io + 0x1200);

      /* disable playback/record */
      value = readl(priv->io + KIRKWOOD_PLAYCTL);
      value &= ~(KIRKWOOD_PLAYCTL_I2S_EN|KIRKWOOD_PLAYCTL_SPDIF_EN);
      writel(value, priv->io + KIRKWOOD_PLAYCTL);

      value = readl(priv->io + KIRKWOOD_RECCTL);
      value &= ~(KIRKWOOD_RECCTL_I2S_EN | KIRKWOOD_RECCTL_SPDIF_EN);
      writel(value, priv->io + KIRKWOOD_RECCTL);

      return 0;

}

static int kirkwood_i2s_remove(struct snd_soc_dai *dai)
{
      return 0;
}

static struct snd_soc_dai_ops kirkwood_i2s_dai_ops = {
      .startup    = kirkwood_i2s_startup,
      .trigger    = kirkwood_i2s_trigger,
      .hw_params      = kirkwood_i2s_hw_params,
      .set_fmt        = kirkwood_i2s_set_fmt,
};


static struct snd_soc_dai_driver kirkwood_i2s_dai = {
      .probe = kirkwood_i2s_probe,
      .remove = kirkwood_i2s_remove,
      .playback = {
            .channels_min = 1,
            .channels_max = 2,
            .rates = KIRKWOOD_I2S_RATES,
            .formats = KIRKWOOD_I2S_FORMATS,},
      .capture = {
            .channels_min = 1,
            .channels_max = 2,
            .rates = KIRKWOOD_I2S_RATES,
            .formats = KIRKWOOD_I2S_FORMATS,},
      .ops = &kirkwood_i2s_dai_ops,
};

static __devinit int kirkwood_i2s_dev_probe(struct platform_device *pdev)
{
      struct resource *mem;
      struct kirkwood_asoc_platform_data *data =
            pdev->dev.platform_data;
      struct kirkwood_dma_data *priv;
      int err;

      priv = kzalloc(sizeof(struct kirkwood_dma_data), GFP_KERNEL);
      if (!priv) {
            dev_err(&pdev->dev, "allocation failed\n");
            err = -ENOMEM;
            goto error;
      }
      dev_set_drvdata(&pdev->dev, priv);

      mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
      if (!mem) {
            dev_err(&pdev->dev, "platform_get_resource failed\n");
            err = -ENXIO;
            goto err_alloc;
      }

      priv->mem = request_mem_region(mem->start, SZ_16K, DRV_NAME);
      if (!priv->mem) {
            dev_err(&pdev->dev, "request_mem_region failed\n");
            err = -EBUSY;
            goto error;
      }

      priv->io = ioremap(priv->mem->start, SZ_16K);
      if (!priv->io) {
            dev_err(&pdev->dev, "ioremap failed\n");
            err = -ENOMEM;
            goto err_iomem;
      }

      priv->irq = platform_get_irq(pdev, 0);
      if (priv->irq <= 0) {
            dev_err(&pdev->dev, "platform_get_irq failed\n");
            err = -ENXIO;
            goto err_ioremap;
      }

      if (!data || !data->dram) {
            dev_err(&pdev->dev, "no platform data ?!\n");
            err = -EINVAL;
            goto err_ioremap;
      }

      priv->dram = data->dram;
      priv->burst = data->burst;

      return snd_soc_register_dai(&pdev->dev, &kirkwood_i2s_dai);

err_ioremap:
      iounmap(priv->io);
err_iomem:
      release_mem_region(priv->mem->start, SZ_16K);
err_alloc:
      kfree(priv);
error:
      return err;
}

static __devexit int kirkwood_i2s_dev_remove(struct platform_device *pdev)
{
      struct kirkwood_dma_data *priv = dev_get_drvdata(&pdev->dev);

      snd_soc_unregister_dai(&pdev->dev);
      iounmap(priv->io);
      release_mem_region(priv->mem->start, SZ_16K);
      kfree(priv);

      return 0;
}

static struct platform_driver kirkwood_i2s_driver = {
      .probe  = kirkwood_i2s_dev_probe,
      .remove = kirkwood_i2s_dev_remove,
      .driver = {
            .name = DRV_NAME,
            .owner = THIS_MODULE,
      },
};

static int __init kirkwood_i2s_init(void)
{
      return platform_driver_register(&kirkwood_i2s_driver);
}
module_init(kirkwood_i2s_init);

static void __exit kirkwood_i2s_exit(void)
{
      platform_driver_unregister(&kirkwood_i2s_driver);
}
module_exit(kirkwood_i2s_exit);

/* Module information */
MODULE_AUTHOR("Arnaud Patard, <arnaud.patard@rtp-net.org>");
MODULE_DESCRIPTION("Kirkwood I2S SoC Interface");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:kirkwood-i2s");

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