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/*
* ALSA SoC IMX MQS driver
*
* Copyright (C) 2014-2015 Freescale Semiconductor, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/mfd/syscon.h>
#include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
#include <linux/of.h>
#include <linux/slab.h>
#include <sound/soc.h>
#include <sound/pcm.h>
#include <sound/initval.h>
/* codec private data */
struct fsl_mqs {
struct platform_device *pdev;
struct regmap *gpr;
struct clk *mclk;
unsigned long mclk_rate;
int sysclk_rate;
int bclk;
int lrclk;
char name[32];
};
#define FSL_MQS_RATES SNDRV_PCM_RATE_8000_192000
#define FSL_MQS_FORMATS SNDRV_PCM_FMTBIT_S16_LE
static int fsl_mqs_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
struct snd_soc_codec *codec = dai->codec;
struct fsl_mqs *mqs_priv = snd_soc_codec_get_drvdata(codec);
int div, res;
mqs_priv->mclk_rate = clk_get_rate(mqs_priv->mclk);
mqs_priv->bclk = snd_soc_params_to_bclk(params);
mqs_priv->lrclk = params_rate(params);
/*
* mclk_rate / (oversample(32,64) * FS * 2 * divider ) = repeat_rate;
* if repeat_rate is 8, mqs can achieve better quality.
* oversample rate is fix to 32 currently.
*/
div = mqs_priv->mclk_rate / (32 * 2 * mqs_priv->lrclk * 8);
res = mqs_priv->mclk_rate % (32 * 2 * mqs_priv->lrclk * 8);
if (res == 0 && div > 0 && div <= 256) {
regmap_update_bits(mqs_priv->gpr, IOMUXC_GPR2,
IMX6SX_GPR2_MQS_CLK_DIV_MASK, (div-1) << IMX6SX_GPR2_MQS_CLK_DIV_SHIFT);
regmap_update_bits(mqs_priv->gpr, IOMUXC_GPR2,
IMX6SX_GPR2_MQS_OVERSAMPLE_MASK, 0 << IMX6SX_GPR2_MQS_OVERSAMPLE_SHIFT);
} else
dev_err(&mqs_priv->pdev->dev, "can't get proper divider\n");
return 0;
}
static int fsl_mqs_set_dai_fmt(struct snd_soc_dai *dai, unsigned int fmt)
{
switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
case SND_SOC_DAIFMT_LEFT_J:
break;
default:
return -EINVAL;
}
switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
case SND_SOC_DAIFMT_NB_NF:
break;
default:
return -EINVAL;
}
switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
case SND_SOC_DAIFMT_CBS_CFS:
break;
default:
return -EINVAL;
}
return 0;
}
static int fsl_mqs_set_dai_sysclk(struct snd_soc_dai *dai, int clk_id,
unsigned int freq, int dir)
{
struct snd_soc_codec *codec = dai->codec;
struct fsl_mqs *mqs_priv = snd_soc_codec_get_drvdata(codec);
mqs_priv->sysclk_rate = freq;
return 0;
}
static int fsl_mqs_startup(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct snd_soc_codec *codec = dai->codec;
struct fsl_mqs *mqs_priv = snd_soc_codec_get_drvdata(codec);
regmap_update_bits(mqs_priv->gpr, IOMUXC_GPR2, IMX6SX_GPR2_MQS_EN_MASK,
1 << IMX6SX_GPR2_MQS_EN_SHIFT);
return 0;
}
static void fsl_mqs_shutdown(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct snd_soc_codec *codec = dai->codec;
struct fsl_mqs *mqs_priv = snd_soc_codec_get_drvdata(codec);
regmap_update_bits(mqs_priv->gpr, IOMUXC_GPR2,
IMX6SX_GPR2_MQS_EN_MASK, 0);
}
static struct snd_soc_codec_driver soc_codec_fsl_mqs;
static const struct snd_soc_dai_ops fsl_mqs_dai_ops = {
.startup = fsl_mqs_startup,
.shutdown = fsl_mqs_shutdown,
.hw_params = fsl_mqs_hw_params,
.set_fmt = fsl_mqs_set_dai_fmt,
.set_sysclk = fsl_mqs_set_dai_sysclk,
};
static struct snd_soc_dai_driver fsl_mqs_dai = {
.name = "fsl-mqs-dai",
.playback = {
.stream_name = "Playback",
.channels_min = 2,
.channels_max = 2,
.rates = FSL_MQS_RATES,
.formats = FSL_MQS_FORMATS,
},
.ops = &fsl_mqs_dai_ops,
};
static int fsl_mqs_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct device_node *gpr_np;
struct fsl_mqs *mqs_priv;
int ret = 0;
mqs_priv = devm_kzalloc(&pdev->dev, sizeof(*mqs_priv), GFP_KERNEL);
if (!mqs_priv)
return -ENOMEM;
mqs_priv->pdev = pdev;
strcpy(mqs_priv->name, np->name);
gpr_np = of_parse_phandle(np, "gpr", 0);
if (IS_ERR(gpr_np)) {
dev_err(&pdev->dev, "failed to get gpr node by phandle\n");
ret = PTR_ERR(gpr_np);
goto out;
}
mqs_priv->gpr = syscon_node_to_regmap(gpr_np);
if (IS_ERR(mqs_priv->gpr)) {
dev_err(&pdev->dev, "failed to get gpr regmap\n");
ret = PTR_ERR(mqs_priv->gpr);
goto out;
}
mqs_priv->mclk = devm_clk_get(&pdev->dev, "mclk");
if (IS_ERR(mqs_priv->mclk)) {
dev_err(&pdev->dev, "failed to get the clock: %ld\n",
PTR_ERR(mqs_priv->mclk));
goto out;
}
dev_set_drvdata(&pdev->dev, mqs_priv);
return snd_soc_register_codec(&pdev->dev, &soc_codec_fsl_mqs,
&fsl_mqs_dai, 1);
out:
if (!IS_ERR(gpr_np))
of_node_put(gpr_np);
return ret;
}
static int fsl_mqs_remove(struct platform_device *pdev)
{
snd_soc_unregister_codec(&pdev->dev);
return 0;
}
static const struct of_device_id fsl_mqs_dt_ids[] = {
{ .compatible = "fsl,imx6sx-mqs", },
{}
};
MODULE_DEVICE_TABLE(of, fsl_mqs_dt_ids);
static struct platform_driver fsl_mqs_driver = {
.probe = fsl_mqs_probe,
.remove = fsl_mqs_remove,
.driver = {
.name = "fsl-mqs",
.owner = THIS_MODULE,
.of_match_table = fsl_mqs_dt_ids,
},
};
module_platform_driver(fsl_mqs_driver);
MODULE_AUTHOR("shengjiu wang <shengjiu.wang@freescale.com>");
MODULE_DESCRIPTION("MQS dummy codec driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform: fsl-mqs");
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