davinci-vcif.c

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/*
 * ALSA SoC Voice Codec Interface for TI DAVINCI processor
 *
 * Copyright (C) 2010 Texas Instruments.
 *
 * Author: Miguel Aguilar <[email protected]>
 *
 * 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"

#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 =
            snd_soc_dai_get_drvdata(rtd->cpu_dai);
    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, 0);
    else
        MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTADC, 0);

    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 =
            snd_soc_dai_get_drvdata(rtd->cpu_dai);
    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, 1);
    else
        MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTADC, 1);

    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 = snd_soc_dai_get_drvdata(dai);
    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);
        break;
    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;
}

static int davinci_vcif_startup(struct snd_pcm_substream *substream,
                struct snd_soc_dai *dai)
{
    struct davinci_vcif_dev *dev = snd_soc_dai_get_drvdata(dai);

    snd_soc_dai_set_dma_data(dai, substream, dev->dma_params);
    return 0;
}

#define DAVINCI_VCIF_RATES  SNDRV_PCM_RATE_8000_48000

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

static struct snd_soc_dai_driver davinci_vcif_dai = {
    .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,

};

static int davinci_vcif_probe(struct platform_device *pdev)
{
    struct davinci_vc *davinci_vc = pdev->dev.platform_data;
    struct davinci_vcif_dev *davinci_vcif_dev;
    int ret;

    davinci_vcif_dev = devm_kzalloc(&pdev->dev,
                    sizeof(struct davinci_vcif_dev),
                    GFP_KERNEL);
    if (!davinci_vcif_dev) {
        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;

    dev_set_drvdata(&pdev->dev, davinci_vcif_dev);

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

    ret = davinci_soc_platform_register(&pdev->dev);
    if (ret) {
        dev_err(&pdev->dev, "register PCM failed: %d\n", ret);
        snd_soc_unregister_dai(&pdev->dev);
        return ret;
    }

    return 0;
}

static int davinci_vcif_remove(struct platform_device *pdev)
{
    snd_soc_unregister_dai(&pdev->dev);
    davinci_soc_platform_unregister(&pdev->dev);

    return 0;
}

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

module_platform_driver(davinci_vcif_driver);

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