s3c2412-i2s.c

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/* sound/soc/samsung/s3c2412-i2s.c
 *
 * ALSA Soc Audio Layer - S3C2412 I2S driver
 *
 * Copyright (c) 2006 Wolfson Microelectronics PLC.
 *  Graeme Gregory [email protected]
 *  [email protected]
 *
 * Copyright (c) 2007, 2004-2005 Simtec Electronics
 *  http://armlinux.simtec.co.uk/
 *  Ben Dooks <[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.
 */

#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/module.h>

#include <sound/soc.h>
#include <sound/pcm_params.h>

#include <mach/dma.h>

#include "dma.h"
#include "regs-i2s-v2.h"
#include "s3c2412-i2s.h"

static struct s3c2410_dma_client s3c2412_dma_client_out = {
    .name       = "I2S PCM Stereo out"
};

static struct s3c2410_dma_client s3c2412_dma_client_in = {
    .name       = "I2S PCM Stereo in"
};

static struct s3c_dma_params s3c2412_i2s_pcm_stereo_out = {
    .client     = &s3c2412_dma_client_out,
    .channel    = DMACH_I2S_OUT,
    .dma_addr   = S3C2410_PA_IIS + S3C2412_IISTXD,
    .dma_size   = 4,
};

static struct s3c_dma_params s3c2412_i2s_pcm_stereo_in = {
    .client     = &s3c2412_dma_client_in,
    .channel    = DMACH_I2S_IN,
    .dma_addr   = S3C2410_PA_IIS + S3C2412_IISRXD,
    .dma_size   = 4,
};

static struct s3c_i2sv2_info s3c2412_i2s;

static int s3c2412_i2s_probe(struct snd_soc_dai *dai)
{
    int ret;

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

    ret = s3c_i2sv2_probe(dai, &s3c2412_i2s, S3C2410_PA_IIS);
    if (ret)
        return ret;

    s3c2412_i2s.dma_capture = &s3c2412_i2s_pcm_stereo_in;
    s3c2412_i2s.dma_playback = &s3c2412_i2s_pcm_stereo_out;

    s3c2412_i2s.iis_cclk = clk_get(dai->dev, "i2sclk");
    if (IS_ERR(s3c2412_i2s.iis_cclk)) {
        pr_err("failed to get i2sclk clock\n");
        iounmap(s3c2412_i2s.regs);
        return PTR_ERR(s3c2412_i2s.iis_cclk);
    }

    /* Set MPLL as the source for IIS CLK */

    clk_set_parent(s3c2412_i2s.iis_cclk, clk_get(NULL, "mpll"));
    clk_enable(s3c2412_i2s.iis_cclk);

    s3c2412_i2s.iis_cclk = s3c2412_i2s.iis_pclk;

    /* Configure the I2S pins (GPE0...GPE4) in correct mode */
    s3c_gpio_cfgall_range(S3C2410_GPE(0), 5, S3C_GPIO_SFN(2),
                  S3C_GPIO_PULL_NONE);

    return 0;
}

static int s3c2412_i2s_remove(struct snd_soc_dai *dai)
{
    clk_disable(s3c2412_i2s.iis_cclk);
    clk_put(s3c2412_i2s.iis_cclk);
    iounmap(s3c2412_i2s.regs);

    return 0;
}

static int s3c2412_i2s_hw_params(struct snd_pcm_substream *substream,
                 struct snd_pcm_hw_params *params,
                 struct snd_soc_dai *cpu_dai)
{
    struct s3c_i2sv2_info *i2s = snd_soc_dai_get_drvdata(cpu_dai);
    struct s3c_dma_params *dma_data;
    u32 iismod;

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

    if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
        dma_data = i2s->dma_playback;
    else
        dma_data = i2s->dma_capture;

    snd_soc_dai_set_dma_data(cpu_dai, substream, dma_data);

    iismod = readl(i2s->regs + S3C2412_IISMOD);
    pr_debug("%s: r: IISMOD: %x\n", __func__, iismod);

    switch (params_format(params)) {
    case SNDRV_PCM_FORMAT_S8:
        iismod |= S3C2412_IISMOD_8BIT;
        break;
    case SNDRV_PCM_FORMAT_S16_LE:
        iismod &= ~S3C2412_IISMOD_8BIT;
        break;
    }

    writel(iismod, i2s->regs + S3C2412_IISMOD);
    pr_debug("%s: w: IISMOD: %x\n", __func__, iismod);

    return 0;
}

#define S3C2412_I2S_RATES \
    (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
    SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
    SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)

static const struct snd_soc_dai_ops s3c2412_i2s_dai_ops = {
    .hw_params  = s3c2412_i2s_hw_params,
};

static struct snd_soc_dai_driver s3c2412_i2s_dai = {
    .probe      = s3c2412_i2s_probe,
    .remove = s3c2412_i2s_remove,
    .playback = {
        .channels_min   = 2,
        .channels_max   = 2,
        .rates      = S3C2412_I2S_RATES,
        .formats    = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
    },
    .capture = {
        .channels_min   = 2,
        .channels_max   = 2,
        .rates      = S3C2412_I2S_RATES,
        .formats    = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
    },
    .ops = &s3c2412_i2s_dai_ops,
};

static __devinit int s3c2412_iis_dev_probe(struct platform_device *pdev)
{
    return s3c_i2sv2_register_dai(&pdev->dev, -1, &s3c2412_i2s_dai);
}

static __devexit int s3c2412_iis_dev_remove(struct platform_device *pdev)
{
    snd_soc_unregister_dai(&pdev->dev);
    return 0;
}

static struct platform_driver s3c2412_iis_driver = {
    .probe  = s3c2412_iis_dev_probe,
    .remove = __devexit_p(s3c2412_iis_dev_remove),
    .driver = {
        .name = "s3c2412-iis",
        .owner = THIS_MODULE,
    },
};

module_platform_driver(s3c2412_iis_driver);

/* Module information */
MODULE_AUTHOR("Ben Dooks, <[email protected]>");
MODULE_DESCRIPTION("S3C2412 I2S SoC Interface");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:s3c2412-iis");