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)

diff --git a/Documentation/devicetree/bindings/sound/fsl,mqs.txt b/Documentation/devicetree/bindings/sound/fsl,mqs.txt
new file mode 100644 (file)
index 0000000..7c28846
--- /dev/null
+++ b/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";
+};

diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index a79c0d141f9015772aed4c270d68c0369e779553..86513b0b165942e6396f5cbc427059a296bc0d1b 100644 (file)
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -293,6 +293,9 @@ config SND_SOC_BT_SCO
 config SND_SOC_DMIC
        tristate
 
+config SND_SOC_FSL_MQS
+       tristate
+
 config SND_SOC_ISABELLE
         tristate
 

diff --git a/sound/soc/codecs/Makefile b/sound/soc/codecs/Makefile
index cfe5d634c8128a39de12a032b60dd28fb6679067..2deeb147067d59cc04f2a87e7e22511b296bdba9 100644 (file)
--- a/sound/soc/codecs/Makefile
+++ b/sound/soc/codecs/Makefile
@@ -32,6 +32,7 @@ snd-soc-da732x-objs := da732x.o
 snd-soc-da9055-objs := da9055.o
 snd-soc-bt-sco-objs := bt-sco.o
 snd-soc-dmic-objs := dmic.o
+snd-soc-fsl-mqs-objs := fsl_mqs.o
 snd-soc-isabelle-objs := isabelle.o
 snd-soc-jz4740-codec-objs := jz4740.o
 snd-soc-l3-objs := l3.o
@@ -167,6 +168,7 @@ obj-$(CONFIG_SND_SOC_DA732X)        += snd-soc-da732x.o
 obj-$(CONFIG_SND_SOC_DA9055)   += snd-soc-da9055.o
 obj-$(CONFIG_SND_SOC_BT_SCO)   += snd-soc-bt-sco.o
 obj-$(CONFIG_SND_SOC_DMIC)     += snd-soc-dmic.o
+obj-$(CONFIG_SND_SOC_FSL_MQS)  += snd-soc-fsl-mqs.o
 obj-$(CONFIG_SND_SOC_ISABELLE) += snd-soc-isabelle.o
 obj-$(CONFIG_SND_SOC_JZ4740_CODEC)     += snd-soc-jz4740-codec.o
 obj-$(CONFIG_SND_SOC_L3)       += snd-soc-l3.o

diff --git a/sound/soc/codecs/fsl_mqs.c b/sound/soc/codecs/fsl_mqs.c
new file mode 100644 (file)
index 0000000..244f422
--- /dev/null
+++ b/sound/soc/codecs/fsl_mqs.c
@@ -0,0 +1,229 @@
+/*
+ * 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",
+               .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");