bf5xx-i2s.c

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/*
 * File:         sound/soc/blackfin/bf5xx-i2s.c
 * Author:       Cliff Cai <[email protected]>
 *
 * 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 int __devinit 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_dai(&pdev->dev, &bf5xx_i2s_dai);
    if (ret) {
        pr_err("Failed to register DAI: %d\n", ret);
        sport_done(sport_handle);
        return ret;
    }

    return 0;
}

static int __devexit 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_dai(&pdev->dev);
    sport_done(sport_handle);

    return 0;
}

static struct platform_driver bfin_i2s_driver = {
    .probe  = bf5xx_i2s_probe,
    .remove = __devexit_p(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");