MLK-9723-4: ASoC: fsl_mqs: add mqs codec driver

Implement codec driver for mqs. mqs is a very simple IP. which support:

Word length: 16bit.
DAI format: Left-Justified, slave mode.

Signed-off-by: Shengjiu Wang <shengjiu.wang@freescale.com>
(cherry picked from commit 9da6bdd2072b850e9bb910512123eff7d80a0e2f)

Documentation/devicetree/bindings/sound/fsl,mqs.txt

@@ -0,0 +1,22 @@
+fsl,mqs audio CODEC
+
+Required properties:
+
+  - compatible : must contain one of "fsl,imx6sx-mqs" and "fsl,codec-mqs"
+
+  - clocks : a list of phandles + clock-specifiers, one for each entry in
+    clock-names
+
+  - clock-names : must contain "mclk"
+
+  - gpr : the gpr node.
+
+Example:
+
+mqs: mqs {
+	compatible = "fsl,imx6sx-mqs";
+	gpr = <&gpr>;
+	clocks = <&clks IMX6SX_CLK_SAI1>;
+	clock-names = "mclk";
+	status = "disabled";
+};

sound/soc/codecs/Kconfig

@@ -696,6 +696,9 @@ config SND_SOC_ES8328_SPI
 	depends on SPI_MASTER
 	select SND_SOC_ES8328
 
+config SND_SOC_FSL_MQS
+	tristate
+
 config SND_SOC_GTM601
 	tristate 'GTM601 UMTS modem audio codec'
 

sound/soc/codecs/Makefile

@@ -86,6 +86,7 @@ snd-soc-es8316-objs := es8316.o
 snd-soc-es8328-objs := es8328.o
 snd-soc-es8328-i2c-objs := es8328-i2c.o
 snd-soc-es8328-spi-objs := es8328-spi.o
+snd-soc-fsl-mqs-objs := fsl_mqs.o
 snd-soc-gtm601-objs := gtm601.o
 snd-soc-hdac-hdmi-objs := hdac_hdmi.o
 snd-soc-hdac-hda-objs := hdac_hda.o
@@ -370,6 +371,7 @@ obj-$(CONFIG_SND_SOC_ES8316)    += snd-soc-es8316.o
 obj-$(CONFIG_SND_SOC_ES8328)	+= snd-soc-es8328.o
 obj-$(CONFIG_SND_SOC_ES8328_I2C)+= snd-soc-es8328-i2c.o
 obj-$(CONFIG_SND_SOC_ES8328_SPI)+= snd-soc-es8328-spi.o
+obj-$(CONFIG_SND_SOC_FSL_MQS)	+= snd-soc-fsl-mqs.o
 obj-$(CONFIG_SND_SOC_GTM601)    += snd-soc-gtm601.o
 obj-$(CONFIG_SND_SOC_HDAC_HDMI) += snd-soc-hdac-hdmi.o
 obj-$(CONFIG_SND_SOC_HDAC_HDA) += snd-soc-hdac-hda.o

sound/soc/codecs/fsl_mqs.c

@@ -0,0 +1,228 @@
+/*
+ * ALSA SoC IMX MQS driver
+ *
+ * Copyright (C) 2014 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->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;
+	}
+
+	mqs_priv->mclk_rate = clk_get_rate(mqs_priv->mclk);
+
+	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",
+		.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");