[PATCH v4 1/2] mfd: Add anatop mfd driver

[paul.liu@linaro.org (Ying-Chun Liu (PaulLiu))]

From: "Ying-Chun Liu (PaulLiu)" <paul.liu@linaro.org>

Anatop is a mfd chip embedded in Freescale i.MX6Q SoC.
Anatop provides regulators and thermal.
This driver handles the address space and the operation of the mfd device.

Signed-off-by: Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>
Cc: Samuel Ortiz <sameo@linux.intel.com>
---
 drivers/mfd/Kconfig        |    6 ++
 drivers/mfd/Makefile       |    1 +
 drivers/mfd/anatop-mfd.c   |  152 ++++++++++++++++++++++++++++++++++++++++++++
 include/linux/mfd/anatop.h |   39 +++++++++++
 4 files changed, 198 insertions(+), 0 deletions(-)
 create mode 100644 drivers/mfd/anatop-mfd.c
 create mode 100644 include/linux/mfd/anatop.h

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index cd13e9f..4f71627 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -830,6 +830,12 @@ config MFD_INTEL_MSIC
 	  Passage) chip. This chip embeds audio, battery, GPIO, etc.
 	  devices used in Intel Medfield platforms.
 
+config MFD_ANATOP
+        bool "Support for Anatop"
+	depends on SOC_IMX6Q
+	help
+	  Select this option to enable Anatop MFD driver.
+
 endmenu
 endif
 
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index b953bab..8e11060 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -112,3 +112,4 @@ obj-$(CONFIG_TPS65911_COMPARATOR)	+= tps65911-comparator.o
 obj-$(CONFIG_MFD_AAT2870_CORE)	+= aat2870-core.o
 obj-$(CONFIG_MFD_INTEL_MSIC)	+= intel_msic.o
 obj-$(CONFIG_MFD_S5M_CORE)	+= s5m-core.o s5m-irq.o
+obj-$(CONFIG_MFD_ANATOP)	+= anatop-mfd.o
diff --git a/drivers/mfd/anatop-mfd.c b/drivers/mfd/anatop-mfd.c
new file mode 100644
index 0000000..58c6054
--- /dev/null
+++ b/drivers/mfd/anatop-mfd.c
@@ -0,0 +1,152 @@
+/*
+ * Anatop MFD driver
+ *
+ * Copyright (C) 2012 Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>
+ * Copyright (C) 2012 Linaro
+ *
+ *  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, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *  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, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/of_address.h>
+#include <linux/mfd/anatop.h>
+
+static u32 anatop_read(struct anatop *adata, u32 addr, int bit_shift, int bits)
+{
+	u32 val;
+	int mask;
+	if (bits == 32)
+		mask = 0xff;
+	else
+		mask = (1 << bits) - 1;
+
+	val = ioread32(adata->ioreg+addr);
+	val = (val >> bit_shift) & mask;
+	return val;
+}
+
+static void anatop_write(struct anatop *adata, u32 addr, int bit_shift,
+			 int bits, u32 data)
+{
+	u32 val;
+	int mask;
+	if (bits == 32)
+		mask = 0xff;
+	else
+		mask = (1 << bits) - 1;
+
+	val = ioread32(adata->ioreg+addr) & ~(mask << bit_shift);
+	iowrite32((data << bit_shift) | val, adata->ioreg);
+}
+
+static const struct of_device_id of_anatop_regulator_match[] = {
+	{
+		.compatible = "fsl,anatop-regulator",
+	},
+	{
+		.compatible = "fsl,anatop-thermal",
+	},
+	{ },
+};
+
+static int of_anatop_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	u64 ofaddr;
+	u64 ofsize;
+	void *ioreg;
+	struct anatop *drvdata;
+	int ret = 0;
+	const __be32 *rval;
+
+	rval = of_get_address(np, 0, &ofsize, NULL);
+	if (rval)
+		ofaddr = be32_to_cpu(*rval);
+	else
+		return -EINVAL;
+
+	ioreg = ioremap(ofaddr, ofsize);
+	if (!ioreg)
+		return -EINVAL;
+	drvdata = devm_kzalloc(dev, sizeof(struct anatop), GFP_KERNEL);
+	if (!drvdata)
+		return -EINVAL;
+	drvdata->ioreg = ioreg;
+	drvdata->read = anatop_read;
+	drvdata->write = anatop_write;
+	platform_set_drvdata(pdev, drvdata);
+	of_platform_bus_probe(np, of_anatop_regulator_match, dev);
+	return ret;
+}
+
+static int of_anatop_remove(struct platform_device *pdev)
+{
+	return 0;
+}
+
+static const struct of_device_id of_anatop_match[] = {
+	{
+		.compatible = "fsl,imx6q-anatop",
+	},
+	{ },
+};
+
+static struct platform_driver anatop_of_driver = {
+	.driver = {
+		.name = "anatop-mfd",
+		.owner = THIS_MODULE,
+		.of_match_table = of_anatop_match,
+	},
+	.probe		= of_anatop_probe,
+	.remove		= of_anatop_remove,
+};
+
+static int __init anatop_init(void)
+{
+	int ret;
+	ret = platform_driver_register(&anatop_of_driver);
+	return ret;
+}
+
+static void __exit anatop_exit(void)
+{
+	platform_driver_unregister(&anatop_of_driver);
+}
+
+postcore_initcall(anatop_init);
+module_exit(anatop_exit);
+
+MODULE_AUTHOR("Ying-Chun Liu (PaulLiu)");
+MODULE_DESCRIPTION("ANATOP MFD driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/mfd/anatop.h b/include/linux/mfd/anatop.h
new file mode 100644
index 0000000..4425538
--- /dev/null
+++ b/include/linux/mfd/anatop.h
@@ -0,0 +1,39 @@
+/*
+ * anatop.h - Anatop MFD driver
+ *
+ *  Copyright (C) 2012 Ying-Chun Liu (PaulLiu) <paulliu@debian.org>
+ *  Copyright (C) 2012 Linaro
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef __LINUX_MFD_ANATOP_H
+#define __LINUX_MFD_ANATOP_H
+
+/**
+ * anatop - MFD data
+ * @ioreg: ioremap register
+ * @read: function to read bits from the device
+ * @write: function to write bits to the device
+ */
+struct anatop {
+	void *ioreg;
+	u32 (*read) (struct anatop *adata, u32 addr, int bit_shift, int bits);
+	void (*write) (struct anatop *adata, u32 addr, int bit_shift,
+		       int bits, u32 data);
+
+};
+
+#endif /*  __LINUX_MFD_ANATOP_H */
-- 
1.7.8.3