[PATCH v3 4/5] regulator: add regulator driver of hi655x PMIC

[Chen Feng <puck.chen@hisilicon.com>]

Add driver support for HiSilicon Hi655x voltage regulators.

Signed-off-by: Chen Feng <puck.chen@hisilicon.com>
Signed-off-by: Fei Wang <w.f@huawei.com>
Tested-by: Xinwei Kong <kong.kongxinwei@hisilicon.com>
---
 drivers/regulator/Kconfig                  |   8 +
 drivers/regulator/Makefile                 |   1 +
 drivers/regulator/hi655x-regulator.c       | 246 +++++++++++++++++++++++++++++
 include/linux/regulator/hi655x-regulator.h |  41 +++++
 4 files changed, 296 insertions(+)
 create mode 100644 drivers/regulator/hi655x-regulator.c
 create mode 100644 include/linux/regulator/hi655x-regulator.h

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 8df0b0e..c6ecfd7 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -261,6 +261,14 @@ config REGULATOR_HI6421
 	  21 general purpose LDOs, 3 dedicated LDOs, and 5 BUCKs. All
 	  of them come with support to either ECO (idle) or sleep mode.
 
+config REGULATOR_HI655X
+	tristate "Hisilicon HI655X PMIC regulators support"
+	depends on ARCH_HISI
+	depends on MFD_HI655X_PMIC && OF
+	help
+	  This driver provides support for the voltage regulators of the
+	  Hisilicon Hi655x PMIC device.
+
 config REGULATOR_ISL9305
 	tristate "Intersil ISL9305 regulator"
 	depends on I2C
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 0f81749..8e4db96 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -34,6 +34,7 @@ obj-$(CONFIG_REGULATOR_DB8500_PRCMU) += db8500-prcmu.o
 obj-$(CONFIG_REGULATOR_FAN53555) += fan53555.o
 obj-$(CONFIG_REGULATOR_GPIO) += gpio-regulator.o
 obj-$(CONFIG_REGULATOR_HI6421) += hi6421-regulator.o
+obj-$(CONFIG_REGULATOR_HI655X) += hi655x-regulator.o
 obj-$(CONFIG_REGULATOR_ISL6271A) += isl6271a-regulator.o
 obj-$(CONFIG_REGULATOR_ISL9305) += isl9305.o
 obj-$(CONFIG_REGULATOR_LP3971) += lp3971.o
diff --git a/drivers/regulator/hi655x-regulator.c b/drivers/regulator/hi655x-regulator.c
new file mode 100644
index 0000000..e222ee7
--- /dev/null
+++ b/drivers/regulator/hi655x-regulator.c
@@ -0,0 +1,246 @@
+/*
+ * Device driver for regulators in hi655x IC
+ *
+ * Copyright (c) 2015 Hisilicon.
+ *
+ * Chen Feng <puck.chen@hisilicon.com>
+ * Fei  Wang <w.f@huawei.com>
+ *
+ * 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/slab.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_address.h>
+#include <linux/regmap.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/delay.h>
+#include <linux/time.h>
+#include <linux/regulator/hi655x-regulator.h>
+#include <linux/mfd/hi655x-pmic.h>
+#include <linux/regmap.h>
+#include <linux/bitops.h>
+#include <linux/string.h>
+
+static int hi655x_is_enabled(struct regulator_dev *rdev)
+{
+	unsigned int value = 0;
+
+	struct hi655x_regulator *regulator = rdev_get_drvdata(rdev);
+	struct hi655x_regulator_ctrl_regs *ctrl_regs = &regulator->ctrl_regs;
+
+	regmap_read(rdev->regmap, ctrl_regs->status_reg, &value);
+	return (value & BIT(regulator->ctrl_mask));
+}
+
+static int hi655x_disable(struct regulator_dev *rdev)
+{
+	int ret = 0;
+
+	struct hi655x_regulator *regulator = rdev_get_drvdata(rdev);
+	struct hi655x_regulator_ctrl_regs *ctrl_regs = &regulator->ctrl_regs;
+
+	ret = regmap_write(rdev->regmap, ctrl_regs->disable_reg,
+			   BIT(regulator->ctrl_mask));
+	return ret;
+}
+
+static int hi655x_get_voltage(struct regulator_dev *rdev)
+{
+	unsigned int value = 0;
+
+	struct hi655x_regulator *regulator = rdev_get_drvdata(rdev);
+
+	regmap_read(rdev->regmap, regulator->vset_reg, &value);
+	value &= regulator->vset_mask;
+
+	return regulator->rdesc.volt_table[value];
+}
+
+static int hi655x_set_voltage(struct regulator_dev *rdev,
+				int min_uV, int max_uV, unsigned *selector)
+{
+	int i = 0;
+	int vol = 0;
+
+	struct hi655x_regulator *regulator = rdev_get_drvdata(rdev);
+
+	/**
+	 * search the matched vol and get its index
+	 */
+	for (i = 0; i < regulator->rdesc.n_voltages; i++) {
+		vol = regulator->rdesc.volt_table[i];
+		if ((vol >= min_uV) && (vol <= max_uV))
+			break;
+	}
+
+	if (i == regulator->rdesc.n_voltages)
+		return -EINVAL;
+
+	regmap_update_bits(rdev->regmap, regulator->vset_reg,
+			   regulator->vset_mask, i);
+
+	*selector = i;
+
+	return 0;
+}
+
+static struct regulator_ops hi655x_regulator_ops = {
+	.enable = regulator_enable_regmap,
+	.disable = hi655x_disable,
+	.is_enabled = hi655x_is_enabled,
+	.list_voltage = regulator_list_voltage_table,
+	.get_voltage = hi655x_get_voltage,
+	.set_voltage = hi655x_set_voltage,
+};
+
+static const struct of_device_id of_hi655x_regulator_match_tbl[] = {
+	{
+		.compatible = "hisilicon,hi655x-regulator-pmic",
+	},
+};
+MODULE_DEVICE_TABLE(of, of_hi655x_regulator_match_tbl);
+
+/**
+ * get the hi655x specific data from dt node.
+ */
+static int of_get_hi655x_ctr(struct hi655x_regulator *regulator,
+			     struct device *dev, struct device_node *np)
+{
+	int ret;
+	u32 *vset_table;
+	u32 vset_reg;
+	u32 ctrl_mask;
+	u32 vset_mask;
+	u32 vol_numb;
+	struct hi655x_regulator_ctrl_regs ctrl_reg;
+	struct hi655x_regulator_ctrl_regs *t_ctrl;
+
+	ret = of_property_read_u32_array(np, "regulator-ctrl-regs",
+					 (u32 *)&ctrl_reg, 0x3);
+	if (!ret) {
+		t_ctrl = &regulator->ctrl_regs;
+		t_ctrl->enable_reg = HI655X_BUS_ADDR(ctrl_reg.enable_reg);
+		t_ctrl->disable_reg = HI655X_BUS_ADDR(ctrl_reg.disable_reg);
+		t_ctrl->status_reg = HI655X_BUS_ADDR(ctrl_reg.status_reg);
+	} else
+		goto error;
+
+	ret = of_property_read_u32(np, "regulator-ctrl-mask", &ctrl_mask);
+	if (!ret)
+		regulator->ctrl_mask = ctrl_mask;
+	else
+		goto error;
+
+	regulator->rdesc.enable_reg = t_ctrl->enable_reg;
+	regulator->rdesc.enable_val = ctrl_mask;
+	regulator->rdesc.enable_mask = ctrl_mask;
+
+	ret = of_property_read_u32(np, "regulator-vset-regs", &vset_reg);
+	if (!ret)
+		regulator->vset_reg = HI655X_BUS_ADDR(vset_reg);
+	else
+		goto error;
+
+	ret = of_property_read_u32(np, "regulator-vset-mask", &vset_mask);
+	if (!ret)
+		regulator->vset_mask = vset_mask;
+	else
+		goto error;
+
+	ret = of_property_read_u32(np, "regulator-n-vol", &vol_numb);
+	if (!ret)
+		regulator->rdesc.n_voltages = vol_numb;
+	else
+		goto error;
+
+	vset_table = devm_kzalloc(dev, vol_numb * sizeof(int), GFP_KERNEL);
+	if (!vset_table)
+		return -ENOMEM;
+
+	ret = of_property_read_u32_array(np, "regulator-vset-table",
+					 vset_table,
+					 vol_numb);
+
+	if (!ret)
+		regulator->rdesc.volt_table = vset_table;
+
+	return 0;
+error:
+	dev_err(dev, "get from dts node error!\n");
+	return -ENODEV;
+}
+
+static int hi655x_regulator_probe(struct platform_device *pdev)
+{
+	int ret;
+	struct hi655x_regulator *regulator;
+	struct hi655x_pmic *pmic;
+	struct regulator_init_data *init_data;
+	struct regulator_config config = { };
+	struct device_node *np = pdev->dev.of_node;
+	struct device *dev = &pdev->dev;
+
+	pmic = dev_get_drvdata(pdev->dev.parent);
+	if (!pmic) {
+		dev_err(dev, "no pmic in the regulator parent node\n");
+		return -ENODEV;
+	}
+
+	regulator = devm_kzalloc(dev, sizeof(*regulator), GFP_KERNEL);
+	if (!regulator)
+		return -ENOMEM;
+
+	regulator->rdesc.type = REGULATOR_VOLTAGE;
+	regulator->rdesc.owner = THIS_MODULE;
+	regulator->rdesc.ops = &hi655x_regulator_ops;
+	init_data = of_get_regulator_init_data(dev, dev->of_node,
+					       &regulator->rdesc);
+	if (!init_data)
+		return -EINVAL;
+
+	config.dev = &pdev->dev;
+	config.init_data = init_data;
+	config.driver_data = regulator;
+	config.regmap = pmic->regmap;
+	config.of_node = pdev->dev.of_node;
+	regulator->rdesc.name = init_data->constraints.name;
+
+	ret = of_get_hi655x_ctr(regulator, dev, np);
+	if (ret) {
+		dev_err(dev, "get param from dts error!\n");
+		return ret;
+	}
+
+	regulator->regdev = devm_regulator_register(dev,
+						    &regulator->rdesc,
+						    &config);
+	if (IS_ERR(regulator->regdev))
+		return PTR_ERR(regulator->regdev);
+
+	platform_set_drvdata(pdev, regulator);
+
+	return 0;
+}
+
+static struct platform_driver hi655x_regulator_driver = {
+	.driver = {
+		.name	= "hi655x_regulator",
+		.of_match_table = of_hi655x_regulator_match_tbl,
+	},
+	.probe	= hi655x_regulator_probe,
+};
+module_platform_driver(hi655x_regulator_driver);
+
+MODULE_AUTHOR("Chen Feng <puck.chen@hisilicon.com>");
+MODULE_DESCRIPTION("Hisi hi655x PMIC driver");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/regulator/hi655x-regulator.h b/include/linux/regulator/hi655x-regulator.h
new file mode 100644
index 0000000..8c76fc5
--- /dev/null
+++ b/include/linux/regulator/hi655x-regulator.h
@@ -0,0 +1,41 @@
+/*
+ * Head file for hi655x regulator
+ *
+ * Copyright (c) 2015 Hisilicon.
+ *
+ * Chen Feng <puck.chen@hisilicon.com>
+ * Fei  Wang <w.f@huawei.com>
+ *
+ * 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.
+ */
+#ifndef __HISI_HI655X_REGULATOR_H__
+#define __HISI_HI655X_REGULATOR_H__
+
+struct hi655x_regulator_ctrl_regs {
+	u32  enable_reg;
+	u32  disable_reg;
+	u32  status_reg;
+};
+
+struct hi655x_regulator_ctrl_data {
+	int          shift;
+	unsigned int val;
+};
+
+struct hi655x_regulator_vset_data {
+	int          shift;
+	unsigned int mask;
+};
+
+struct hi655x_regulator {
+	struct hi655x_regulator_ctrl_regs ctrl_regs;
+	u32 vset_reg;
+	u32 ctrl_mask;
+	u32 vset_mask;
+	struct regulator_desc rdesc;
+	struct regulator_dev *regdev;
+};
+
+#endif
-- 
1.9.1