/*
 * File:         sound/soc/blackfin/bf5xx-i2s.c
 * Author:       Cliff Cai <Cliff.Cai@analog.com>
 *
 * Created:      Tue June 06 2008
 * Description:  Blackfin I2S CPU DAI driver
 *
 * Modified:
 *               Copyright 2008 Analog Devices Inc.
 *
 * Bugs:         Enter bugs at http://blackfin.uclinux.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.
 *
 * 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, see the file COPYING, or write
 * to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/initval.h>
#include <sound/soc.h>

#include <asm/irq.h>
#include <asm/portmux.h>
#include <linux/mutex.h>
#include <linux/gpio.h>

#include "bf5xx-sport.h"

struct bf5xx_i2s_port {
        u16 tcr1;
        u16 rcr1;
        u16 tcr2;
        u16 rcr2;
        int configured;
};

static int bf5xx_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai,
                unsigned int fmt)
{
        struct sport_device *sport_handle = snd_soc_dai_get_drvdata(cpu_dai);
        struct bf5xx_i2s_port *bf5xx_i2s = sport_handle->private_data;
        int ret = 0;

        /* interface format:support I2S,slave mode */
        switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
        case SND_SOC_DAIFMT_I2S:
                bf5xx_i2s->tcr1 |= TFSR | TCKFE;
                bf5xx_i2s->rcr1 |= RFSR | RCKFE;
                bf5xx_i2s->tcr2 |= TSFSE;
                bf5xx_i2s->rcr2 |= RSFSE;
                break;
        case SND_SOC_DAIFMT_DSP_A:
                bf5xx_i2s->tcr1 |= TFSR;
                bf5xx_i2s->rcr1 |= RFSR;
                break;
        case SND_SOC_DAIFMT_LEFT_J:
                ret = -EINVAL;
                break;
        default:
                printk(KERN_ERR "%s: Unknown DAI format type\n", __func__);
                ret = -EINVAL;
                break;
        }

        switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
        case SND_SOC_DAIFMT_CBM_CFM:
                break;
        case SND_SOC_DAIFMT_CBS_CFS:
        case SND_SOC_DAIFMT_CBM_CFS:
        case SND_SOC_DAIFMT_CBS_CFM:
                ret = -EINVAL;
                break;
        default:
                printk(KERN_ERR "%s: Unknown DAI master type\n", __func__);
                ret = -EINVAL;
                break;
        }

        return ret;
}

static int bf5xx_i2s_hw_params(struct snd_pcm_substream *substream,
                                struct snd_pcm_hw_params *params,
                                struct snd_soc_dai *dai)
{
        struct sport_device *sport_handle = snd_soc_dai_get_drvdata(dai);
        struct bf5xx_i2s_port *bf5xx_i2s = sport_handle->private_data;
        int ret = 0;

        bf5xx_i2s->tcr2 &= ~0x1f;
        bf5xx_i2s->rcr2 &= ~0x1f;
        switch (params_format(params)) {
        case SNDRV_PCM_FORMAT_S8:
                bf5xx_i2s->tcr2 |= 7;
                bf5xx_i2s->rcr2 |= 7;
                sport_handle->wdsize = 1;
        case SNDRV_PCM_FORMAT_S16_LE:
                bf5xx_i2s->tcr2 |= 15;
                bf5xx_i2s->rcr2 |= 15;
                sport_handle->wdsize = 2;
                break;
        case SNDRV_PCM_FORMAT_S24_LE:
                bf5xx_i2s->tcr2 |= 23;
                bf5xx_i2s->rcr2 |= 23;
                sport_handle->wdsize = 3;
                break;
        case SNDRV_PCM_FORMAT_S32_LE:
                bf5xx_i2s->tcr2 |= 31;
                bf5xx_i2s->rcr2 |= 31;
                sport_handle->wdsize = 4;
                break;
        }

        if (!bf5xx_i2s->configured) {
                /*
                 * TX and RX are not independent,they are enabled at the
                 * same time, even if only one side is running. So, we
                 * need to configure both of them at the time when the first
                 * stream is opened.
                 *
                 * CPU DAI:slave mode.
                 */
                bf5xx_i2s->configured = 1;
                ret = sport_config_rx(sport_handle, bf5xx_i2s->rcr1,
                                      bf5xx_i2s->rcr2, 0, 0);
                if (ret) {
                        pr_err("SPORT is busy!\n");
                        return -EBUSY;
                }

                ret = sport_config_tx(sport_handle, bf5xx_i2s->tcr1,
                                      bf5xx_i2s->tcr2, 0, 0);
                if (ret) {
                        pr_err("SPORT is busy!\n");
                        return -EBUSY;
                }
        }

        return 0;
}

static void bf5xx_i2s_shutdown(struct snd_pcm_substream *substream,
                               struct snd_soc_dai *dai)
{
        struct sport_device *sport_handle = snd_soc_dai_get_drvdata(dai);
        struct bf5xx_i2s_port *bf5xx_i2s = sport_handle->private_data;

        pr_debug("%s enter\n", __func__);
        /* No active stream, SPORT is allowed to be configured again. */
        if (!dai->active)
                bf5xx_i2s->configured = 0;
}

#ifdef CONFIG_PM
static int bf5xx_i2s_suspend(struct snd_soc_dai *dai)
{
        struct sport_device *sport_handle = snd_soc_dai_get_drvdata(dai);

        pr_debug("%s : sport %d\n", __func__, dai->id);

        if (dai->capture_active)
                sport_rx_stop(sport_handle);
        if (dai->playback_active)
                sport_tx_stop(sport_handle);
        return 0;
}

static int bf5xx_i2s_resume(struct snd_soc_dai *dai)
{
        struct sport_device *sport_handle = snd_soc_dai_get_drvdata(dai);
        struct bf5xx_i2s_port *bf5xx_i2s = sport_handle->private_data;
        int ret;

        pr_debug("%s : sport %d\n", __func__, dai->id);

        ret = sport_config_rx(sport_handle, bf5xx_i2s->rcr1,
                                      bf5xx_i2s->rcr2, 0, 0);
        if (ret) {
                pr_err("SPORT is busy!\n");
                return -EBUSY;
        }

        ret = sport_config_tx(sport_handle, bf5xx_i2s->tcr1,
                                      bf5xx_i2s->tcr2, 0, 0);
        if (ret) {
                pr_err("SPORT is busy!\n");
                return -EBUSY;
        }

        return 0;
}

#else
#define bf5xx_i2s_suspend       NULL
#define bf5xx_i2s_resume        NULL
#endif

#define BF5XX_I2S_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
                SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 | \
                SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 | \
                SNDRV_PCM_RATE_96000)

#define BF5XX_I2S_FORMATS \
        (SNDRV_PCM_FMTBIT_S8 | \
         SNDRV_PCM_FMTBIT_S16_LE | \
         SNDRV_PCM_FMTBIT_S24_LE | \
         SNDRV_PCM_FMTBIT_S32_LE)

static const struct snd_soc_dai_ops bf5xx_i2s_dai_ops = {
        .shutdown       = bf5xx_i2s_shutdown,
        .hw_params      = bf5xx_i2s_hw_params,
        .set_fmt        = bf5xx_i2s_set_dai_fmt,
};

static struct snd_soc_dai_driver bf5xx_i2s_dai = {
        .suspend = bf5xx_i2s_suspend,
        .resume = bf5xx_i2s_resume,
        .playback = {
                .channels_min = 1,
                .channels_max = 2,
                .rates = BF5XX_I2S_RATES,
                .formats = BF5XX_I2S_FORMATS,},
        .capture = {
                .channels_min = 1,
                .channels_max = 2,
                .rates = BF5XX_I2S_RATES,
                .formats = BF5XX_I2S_FORMATS,},
        .ops = &bf5xx_i2s_dai_ops,
};

static const struct snd_soc_component_driver bf5xx_i2s_component = {
        .name           = "bf5xx-i2s",
};

static int bf5xx_i2s_probe(struct platform_device *pdev)
{
        struct sport_device *sport_handle;
        int ret;

        /* configure SPORT for I2S */
        sport_handle = sport_init(pdev, 4, 2 * sizeof(u32),
                sizeof(struct bf5xx_i2s_port));
        if (!sport_handle)
                return -ENODEV;

        /* register with the ASoC layers */
        ret = snd_soc_register_component(&pdev->dev, &bf5xx_i2s_component,
                                         &bf5xx_i2s_dai, 1);
        if (ret) {
                pr_err("Failed to register DAI: %d\n", ret);
                sport_done(sport_handle);
                return ret;
        }

        return 0;
}

static int bf5xx_i2s_remove(struct platform_device *pdev)
{
        struct sport_device *sport_handle = platform_get_drvdata(pdev);

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

        snd_soc_unregister_component(&pdev->dev);
        sport_done(sport_handle);

        return 0;
}

static struct platform_driver bfin_i2s_driver = {
        .probe  = bf5xx_i2s_probe,
        .remove = bf5xx_i2s_remove,
        .driver = {
                .name = "bfin-i2s",
                .owner = THIS_MODULE,
        },
};

module_platform_driver(bfin_i2s_driver);

/* Module information */
MODULE_AUTHOR("Cliff Cai");
MODULE_DESCRIPTION("I2S driver for ADI Blackfin");
MODULE_LICENSE("GPL");