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davinci-vcif.c

/*
 * ALSA SoC Voice Codec Interface for TI DAVINCI processor
 *
 * Copyright (C) 2010 Texas Instruments.
 *
 * Author: Miguel Aguilar <miguel.aguilar@ridgerun.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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/mfd/davinci_voicecodec.h>

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

#include "davinci-pcm.h"
#include "davinci-i2s.h"
#include "davinci-vcif.h"

#define MOD_REG_BIT(val, mask, set) do { \
      if (set) { \
            val |= mask; \
      } else { \
            val &= ~mask; \
      } \
} while (0)

struct davinci_vcif_dev {
      struct davinci_vc *davinci_vc;
      struct davinci_pcm_dma_params dma_params[2];
};

static void davinci_vcif_start(struct snd_pcm_substream *substream)
{
      struct snd_soc_pcm_runtime *rtd = substream->private_data;
      struct davinci_vcif_dev *davinci_vcif_dev =
                              rtd->dai->cpu_dai->private_data;
      struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
      u32 w;

      /* Start the sample generator and enable transmitter/receiver */
      w = readl(davinci_vc->base + DAVINCI_VC_CTRL);

      if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
            MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTDAC, 1);
      else
            MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTADC, 1);

      writel(w, davinci_vc->base + DAVINCI_VC_CTRL);
}

static void davinci_vcif_stop(struct snd_pcm_substream *substream)
{
      struct snd_soc_pcm_runtime *rtd = substream->private_data;
      struct davinci_vcif_dev *davinci_vcif_dev =
                              rtd->dai->cpu_dai->private_data;
      struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
      u32 w;

      /* Reset transmitter/receiver and sample rate/frame sync generators */
      w = readl(davinci_vc->base + DAVINCI_VC_CTRL);
      if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
            MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTDAC, 0);
      else
            MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTADC, 0);

      writel(w, davinci_vc->base + DAVINCI_VC_CTRL);
}

static int davinci_vcif_hw_params(struct snd_pcm_substream *substream,
                          struct snd_pcm_hw_params *params,
                          struct snd_soc_dai *dai)
{
      struct davinci_vcif_dev *davinci_vcif_dev = dai->private_data;
      struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
      struct davinci_pcm_dma_params *dma_params =
                  &davinci_vcif_dev->dma_params[substream->stream];
      u32 w;

      /* Restart the codec before setup */
      davinci_vcif_stop(substream);
      davinci_vcif_start(substream);

      /* General line settings */
      writel(DAVINCI_VC_CTRL_MASK, davinci_vc->base + DAVINCI_VC_CTRL);

      writel(DAVINCI_VC_INT_MASK, davinci_vc->base + DAVINCI_VC_INTCLR);

      writel(DAVINCI_VC_INT_MASK, davinci_vc->base + DAVINCI_VC_INTEN);

      w = readl(davinci_vc->base + DAVINCI_VC_CTRL);

      /* Determine xfer data type */
      switch (params_format(params)) {
      case SNDRV_PCM_FORMAT_U8:
            dma_params->data_type = 0;

            MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_BITS_8 |
                      DAVINCI_VC_CTRL_RD_UNSIGNED |
                      DAVINCI_VC_CTRL_WD_BITS_8 |
                      DAVINCI_VC_CTRL_WD_UNSIGNED, 1);
            break;
      case SNDRV_PCM_FORMAT_S8:
            dma_params->data_type = 1;

            MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_BITS_8 |
                      DAVINCI_VC_CTRL_WD_BITS_8, 1);

            MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_UNSIGNED |
                      DAVINCI_VC_CTRL_WD_UNSIGNED, 0);
            break;
      case SNDRV_PCM_FORMAT_S16_LE:
            dma_params->data_type = 2;

            MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_BITS_8 |
                      DAVINCI_VC_CTRL_RD_UNSIGNED |
                      DAVINCI_VC_CTRL_WD_BITS_8 |
                      DAVINCI_VC_CTRL_WD_UNSIGNED, 0);
            break;
      default:
            printk(KERN_WARNING "davinci-vcif: unsupported PCM format");
            return -EINVAL;
      }

      dma_params->acnt  = dma_params->data_type;

      writel(w, davinci_vc->base + DAVINCI_VC_CTRL);

      return 0;
}

static int davinci_vcif_trigger(struct snd_pcm_substream *substream, int cmd,
                        struct snd_soc_dai *dai)
{
      int ret = 0;

      switch (cmd) {
      case SNDRV_PCM_TRIGGER_START:
      case SNDRV_PCM_TRIGGER_RESUME:
      case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
            davinci_vcif_start(substream);
      case SNDRV_PCM_TRIGGER_STOP:
      case SNDRV_PCM_TRIGGER_SUSPEND:
      case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
            davinci_vcif_stop(substream);
            break;
      default:
            ret = -EINVAL;
      }

      return ret;
}

#define DAVINCI_VCIF_RATES    SNDRV_PCM_RATE_8000_48000

static struct snd_soc_dai_ops davinci_vcif_dai_ops = {
      .trigger    = davinci_vcif_trigger,
      .hw_params  = davinci_vcif_hw_params,
};

struct snd_soc_dai davinci_vcif_dai = {
      .name = "davinci-vcif",
      .playback = {
            .channels_min = 1,
            .channels_max = 2,
            .rates = DAVINCI_VCIF_RATES,
            .formats = SNDRV_PCM_FMTBIT_S16_LE,},
      .capture = {
            .channels_min = 1,
            .channels_max = 2,
            .rates = DAVINCI_VCIF_RATES,
            .formats = SNDRV_PCM_FMTBIT_S16_LE,},
      .ops = &davinci_vcif_dai_ops,

};
EXPORT_SYMBOL_GPL(davinci_vcif_dai);

static int davinci_vcif_probe(struct platform_device *pdev)
{
      struct davinci_vc *davinci_vc = platform_get_drvdata(pdev);
      struct davinci_vcif_dev *davinci_vcif_dev;
      int ret;

      davinci_vcif_dev = kzalloc(sizeof(struct davinci_vcif_dev), GFP_KERNEL);
      if (!davinci_vc) {
            dev_dbg(&pdev->dev,
                  "could not allocate memory for private data\n");
            return -ENOMEM;
      }

      /* DMA tx params */
      davinci_vcif_dev->davinci_vc = davinci_vc;
      davinci_vcif_dev->dma_params[SNDRV_PCM_STREAM_PLAYBACK].channel =
                              davinci_vc->davinci_vcif.dma_tx_channel;
      davinci_vcif_dev->dma_params[SNDRV_PCM_STREAM_PLAYBACK].dma_addr =
                              davinci_vc->davinci_vcif.dma_tx_addr;

      /* DMA rx params */
      davinci_vcif_dev->dma_params[SNDRV_PCM_STREAM_CAPTURE].channel =
                              davinci_vc->davinci_vcif.dma_rx_channel;
      davinci_vcif_dev->dma_params[SNDRV_PCM_STREAM_CAPTURE].dma_addr =
                              davinci_vc->davinci_vcif.dma_rx_addr;

      davinci_vcif_dai.dev = &pdev->dev;
      davinci_vcif_dai.capture.dma_data = davinci_vcif_dev->dma_params;
      davinci_vcif_dai.playback.dma_data = davinci_vcif_dev->dma_params;
      davinci_vcif_dai.private_data = davinci_vcif_dev;

      ret = snd_soc_register_dai(&davinci_vcif_dai);
      if (ret != 0) {
            dev_err(&pdev->dev, "could not register dai\n");
            goto fail;
      }

      return 0;

fail:
      kfree(davinci_vcif_dev);

      return ret;
}

static int davinci_vcif_remove(struct platform_device *pdev)
{
      snd_soc_unregister_dai(&davinci_vcif_dai);

      return 0;
}

static struct platform_driver davinci_vcif_driver = {
      .probe            = davinci_vcif_probe,
      .remove           = davinci_vcif_remove,
      .driver           = {
            .name = "davinci_vcif",
            .owner      = THIS_MODULE,
      },
};

static int __init davinci_vcif_init(void)
{
      return platform_driver_probe(&davinci_vcif_driver, davinci_vcif_probe);
}
module_init(davinci_vcif_init);

static void __exit davinci_vcif_exit(void)
{
      platform_driver_unregister(&davinci_vcif_driver);
}
module_exit(davinci_vcif_exit);

MODULE_AUTHOR("Miguel Aguilar");
MODULE_DESCRIPTION("Texas Instruments DaVinci ASoC Voice Codec Interface");
MODULE_LICENSE("GPL");

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