regulator: mt6397: Add support for MT6397 regulator

Add MT6397 regulator driver.

Signed-off-by: Flora Fu <flora.fu@mediatek.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

3 files changed, 342 insertions, 0 deletions

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index c3a60b5..f622d06 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -433,6 +433,15 @@ config REGULATOR_MC13892
 	  Say y here to support the regulators found on the Freescale MC13892
 	  PMIC.
 
+config REGULATOR_MT6397
+	tristate "MediaTek MT6397 PMIC"
+	depends on MFD_MT6397
+	help
+	  Say y here to select this option to enable the power regulator of
+	  MediaTek MT6397 PMIC.
+	  This driver supports the control of different power rails of device
+	  through regulator interface.
+
 config REGULATOR_PALMAS
 	tristate "TI Palmas PMIC Regulators"
 	depends on MFD_PALMAS
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 1f28ebf..1a0fbc3 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -58,6 +58,7 @@ obj-$(CONFIG_REGULATOR_MAX77802) += max77802.o
 obj-$(CONFIG_REGULATOR_MC13783) += mc13783-regulator.o
 obj-$(CONFIG_REGULATOR_MC13892) += mc13892-regulator.o
 obj-$(CONFIG_REGULATOR_MC13XXX_CORE) +=  mc13xxx-regulator-core.o
+obj-$(CONFIG_REGULATOR_MT6397)	+= mt6397-regulator.o
 obj-$(CONFIG_REGULATOR_QCOM_RPM) += qcom_rpm-regulator.o
 obj-$(CONFIG_REGULATOR_PALMAS) += palmas-regulator.o
 obj-$(CONFIG_REGULATOR_PFUZE100) += pfuze100-regulator.o
diff --git a/drivers/regulator/mt6397-regulator.c b/drivers/regulator/mt6397-regulator.c
new file mode 100644
index 0000000..a5b2f47
--- /dev/null
+++ b/drivers/regulator/mt6397-regulator.c
@@ -0,0 +1,332 @@
+/*
+ * Copyright (c) 2014 MediaTek Inc.
+ * Author: Flora Fu <flora.fu@mediatek.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.
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/mfd/mt6397/core.h>
+#include <linux/mfd/mt6397/registers.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/mt6397-regulator.h>
+#include <linux/regulator/of_regulator.h>
+
+/*
+ * MT6397 regulators' information
+ *
+ * @desc: standard fields of regulator description.
+ * @qi: Mask for query enable signal status of regulators
+ * @vselon_reg: Register sections for hardware control mode of bucks
+ * @vselctrl_reg: Register for controlling the buck control mode.
+ * @vselctrl_mask: Mask for query buck's voltage control mode.
+ */
+struct mt6397_regulator_info {
+	struct regulator_desc desc;
+	u32 qi;
+	u32 vselon_reg;
+	u32 vselctrl_reg;
+	u32 vselctrl_mask;
+};
+
+#define MT6397_BUCK(match, vreg, min, max, step, volt_ranges, enreg,	\
+		vosel, vosel_mask, voselon, vosel_ctrl)			\
+[MT6397_ID_##vreg] = {							\
+	.desc = {							\
+		.name = #vreg,						\
+		.of_match = of_match_ptr(match),			\
+		.ops = &mt6397_volt_range_ops,				\
+		.type = REGULATOR_VOLTAGE,				\
+		.id = MT6397_ID_##vreg,					\
+		.owner = THIS_MODULE,					\
+		.n_voltages = (max - min)/step + 1,			\
+		.linear_ranges = volt_ranges,				\
+		.n_linear_ranges = ARRAY_SIZE(volt_ranges),		\
+		.vsel_reg = vosel,					\
+		.vsel_mask = vosel_mask,				\
+		.enable_reg = enreg,					\
+		.enable_mask = BIT(0),					\
+	},								\
+	.qi = BIT(13),							\
+	.vselon_reg = voselon,						\
+	.vselctrl_reg = vosel_ctrl,					\
+	.vselctrl_mask = BIT(1),					\
+}
+
+#define MT6397_LDO(match, vreg, ldo_volt_table, enreg, enbit, vosel,	\
+		vosel_mask)						\
+[MT6397_ID_##vreg] = {							\
+	.desc = {							\
+		.name = #vreg,						\
+		.of_match = of_match_ptr(match),			\
+		.ops = &mt6397_volt_table_ops,				\
+		.type = REGULATOR_VOLTAGE,				\
+		.id = MT6397_ID_##vreg,					\
+		.owner = THIS_MODULE,					\
+		.n_voltages = ARRAY_SIZE(ldo_volt_table),		\
+		.volt_table = ldo_volt_table,				\
+		.vsel_reg = vosel,					\
+		.vsel_mask = vosel_mask,				\
+		.enable_reg = enreg,					\
+		.enable_mask = BIT(enbit),				\
+	},								\
+	.qi = BIT(15),							\
+}
+
+#define MT6397_REG_FIXED(match, vreg, enreg, enbit, volt)		\
+[MT6397_ID_##vreg] = {							\
+	.desc = {							\
+		.name = #vreg,						\
+		.of_match = of_match_ptr(match),			\
+		.ops = &mt6397_volt_fixed_ops,				\
+		.type = REGULATOR_VOLTAGE,				\
+		.id = MT6397_ID_##vreg,					\
+		.owner = THIS_MODULE,					\
+		.n_voltages = 1,					\
+		.enable_reg = enreg,					\
+		.enable_mask = BIT(enbit),				\
+		.min_uV = volt,						\
+	},								\
+	.qi = BIT(15),							\
+}
+
+static const struct regulator_linear_range buck_volt_range1[] = {
+	REGULATOR_LINEAR_RANGE(700000, 0, 0x7f, 6250),
+};
+
+static const struct regulator_linear_range buck_volt_range2[] = {
+	REGULATOR_LINEAR_RANGE(800000, 0, 0x7f, 6250),
+};
+
+static const struct regulator_linear_range buck_volt_range3[] = {
+	REGULATOR_LINEAR_RANGE(1500000, 0, 0x1f, 20000),
+};
+
+static const u32 ldo_volt_table1[] = {
+	1500000, 1800000, 2500000, 2800000,
+};
+
+static const u32 ldo_volt_table2[] = {
+	1800000, 3300000,
+};
+
+static const u32 ldo_volt_table3[] = {
+	3000000, 3300000,
+};
+
+static const u32 ldo_volt_table4[] = {
+	1220000, 1300000, 1500000, 1800000, 2500000, 2800000, 3000000, 3300000,
+};
+
+static const u32 ldo_volt_table5[] = {
+	1200000, 1300000, 1500000, 1800000, 2500000, 2800000, 3000000, 3300000,
+};
+
+static const u32 ldo_volt_table5_v2[] = {
+	1200000, 1000000, 1500000, 1800000, 2500000, 2800000, 3000000, 3300000,
+};
+
+static const u32 ldo_volt_table6[] = {
+	1200000, 1300000, 1500000, 1800000, 2500000, 2800000, 3000000, 2000000,
+};
+
+static const u32 ldo_volt_table7[] = {
+	1300000, 1500000, 1800000, 2000000, 2500000, 2800000, 3000000, 3300000,
+};
+
+static int mt6397_get_status(struct regulator_dev *rdev)
+{
+	int ret;
+	u32 regval;
+	struct mt6397_regulator_info *info = rdev_get_drvdata(rdev);
+
+	ret = regmap_read(rdev->regmap, info->desc.enable_reg, &regval);
+	if (ret != 0) {
+		dev_err(&rdev->dev, "Failed to get enable reg: %d\n", ret);
+		return ret;
+	}
+
+	return (regval & info->qi) ? REGULATOR_STATUS_ON : REGULATOR_STATUS_OFF;
+}
+
+static struct regulator_ops mt6397_volt_range_ops = {
+	.list_voltage = regulator_list_voltage_linear_range,
+	.map_voltage = regulator_map_voltage_linear_range,
+	.set_voltage_sel = regulator_set_voltage_sel_regmap,
+	.get_voltage_sel = regulator_get_voltage_sel_regmap,
+	.set_voltage_time_sel = regulator_set_voltage_time_sel,
+	.enable = regulator_enable_regmap,
+	.disable = regulator_disable_regmap,
+	.is_enabled = regulator_is_enabled_regmap,
+	.get_status = mt6397_get_status,
+};
+
+static struct regulator_ops mt6397_volt_table_ops = {
+	.list_voltage = regulator_list_voltage_table,
+	.map_voltage = regulator_map_voltage_iterate,
+	.set_voltage_sel = regulator_set_voltage_sel_regmap,
+	.get_voltage_sel = regulator_get_voltage_sel_regmap,
+	.set_voltage_time_sel = regulator_set_voltage_time_sel,
+	.enable = regulator_enable_regmap,
+	.disable = regulator_disable_regmap,
+	.is_enabled = regulator_is_enabled_regmap,
+	.get_status = mt6397_get_status,
+};
+
+static struct regulator_ops mt6397_volt_fixed_ops = {
+	.list_voltage = regulator_list_voltage_linear,
+	.enable = regulator_enable_regmap,
+	.disable = regulator_disable_regmap,
+	.is_enabled = regulator_is_enabled_regmap,
+	.get_status = mt6397_get_status,
+};
+
+/* The array is indexed by id(MT6397_ID_XXX) */
+static struct mt6397_regulator_info mt6397_regulators[] = {
+	MT6397_BUCK("buck_vpca15", VPCA15, 700000, 1493750, 6250,
+		buck_volt_range1, MT6397_VCA15_CON7, MT6397_VCA15_CON9, 0x7f,
+		MT6397_VCA15_CON10, MT6397_VCA15_CON5),
+	MT6397_BUCK("buck_vpca7", VPCA7, 700000, 1493750, 6250,
+		buck_volt_range1, MT6397_VPCA7_CON7, MT6397_VPCA7_CON9, 0x7f,
+		MT6397_VPCA7_CON10, MT6397_VPCA7_CON5),
+	MT6397_BUCK("buck_vsramca15", VSRAMCA15, 700000, 1493750, 6250,
+		buck_volt_range1, MT6397_VSRMCA15_CON7, MT6397_VSRMCA15_CON9,
+		0x7f, MT6397_VSRMCA15_CON10, MT6397_VSRMCA15_CON5),
+	MT6397_BUCK("buck_vsramca7", VSRAMCA7, 700000, 1493750, 6250,
+		buck_volt_range1, MT6397_VSRMCA7_CON7, MT6397_VSRMCA7_CON9,
+		0x7f, MT6397_VSRMCA7_CON10, MT6397_VSRMCA7_CON5),
+	MT6397_BUCK("buck_vcore", VCORE, 700000, 1493750, 6250,
+		buck_volt_range1, MT6397_VCORE_CON7, MT6397_VCORE_CON9, 0x7f,
+		MT6397_VCORE_CON10, MT6397_VCORE_CON5),
+	MT6397_BUCK("buck_vgpu", VGPU, 700000, 1493750, 6250, buck_volt_range1,
+		MT6397_VGPU_CON7, MT6397_VGPU_CON9, 0x7f,
+		MT6397_VGPU_CON10, MT6397_VGPU_CON5),
+	MT6397_BUCK("buck_vdrm", VDRM, 800000, 1593750, 6250, buck_volt_range2,
+		MT6397_VDRM_CON7, MT6397_VDRM_CON9, 0x7f,
+		MT6397_VDRM_CON10, MT6397_VDRM_CON5),
+	MT6397_BUCK("buck_vio18", VIO18, 1500000, 2120000, 20000,
+		buck_volt_range3, MT6397_VIO18_CON7, MT6397_VIO18_CON9, 0x1f,
+		MT6397_VIO18_CON10, MT6397_VIO18_CON5),
+	MT6397_REG_FIXED("ldo_vtcxo", VTCXO, MT6397_ANALDO_CON0, 10, 2800000),
+	MT6397_REG_FIXED("ldo_va28", VA28, MT6397_ANALDO_CON1, 14, 2800000),
+	MT6397_LDO("ldo_vcama", VCAMA, ldo_volt_table1,
+		MT6397_ANALDO_CON2, 15, MT6397_ANALDO_CON6, 0xC0),
+	MT6397_REG_FIXED("ldo_vio28", VIO28, MT6397_DIGLDO_CON0, 14, 2800000),
+	MT6397_REG_FIXED("ldo_vusb", VUSB, MT6397_DIGLDO_CON1, 14, 3300000),
+	MT6397_LDO("ldo_vmc", VMC, ldo_volt_table2,
+		MT6397_DIGLDO_CON2, 12, MT6397_DIGLDO_CON29, 0x10),
+	MT6397_LDO("ldo_vmch", VMCH, ldo_volt_table3,
+		MT6397_DIGLDO_CON3, 14, MT6397_DIGLDO_CON17, 0x80),
+	MT6397_LDO("ldo_vemc3v3", VEMC3V3, ldo_volt_table3,
+		MT6397_DIGLDO_CON4, 14, MT6397_DIGLDO_CON18, 0x10),
+	MT6397_LDO("ldo_vgp1", VGP1, ldo_volt_table4,
+		MT6397_DIGLDO_CON5, 15, MT6397_DIGLDO_CON19, 0xE0),
+	MT6397_LDO("ldo_vgp2", VGP2, ldo_volt_table5,
+		MT6397_DIGLDO_CON6, 15, MT6397_DIGLDO_CON20, 0xE0),
+	MT6397_LDO("ldo_vgp3", VGP3, ldo_volt_table5,
+		MT6397_DIGLDO_CON7, 15, MT6397_DIGLDO_CON21, 0xE0),
+	MT6397_LDO("ldo_vgp4", VGP4, ldo_volt_table5,
+		MT6397_DIGLDO_CON8, 15, MT6397_DIGLDO_CON22, 0xE0),
+	MT6397_LDO("ldo_vgp5", VGP5, ldo_volt_table6,
+		MT6397_DIGLDO_CON9, 15, MT6397_DIGLDO_CON23, 0xE0),
+	MT6397_LDO("ldo_vgp6", VGP6, ldo_volt_table5,
+		MT6397_DIGLDO_CON10, 15, MT6397_DIGLDO_CON33, 0xE0),
+	MT6397_LDO("ldo_vibr", VIBR, ldo_volt_table7,
+		MT6397_DIGLDO_CON24, 15, MT6397_DIGLDO_CON25, 0xE00),
+};
+
+static int mt6397_set_buck_vosel_reg(struct platform_device *pdev)
+{
+	struct mt6397_chip *mt6397 = dev_get_drvdata(pdev->dev.parent);
+	int i;
+	u32 regval;
+
+	for (i = 0; i < MT6397_MAX_REGULATOR; i++) {
+		if (mt6397_regulators[i].vselctrl_reg) {
+			if (regmap_read(mt6397->regmap,
+				mt6397_regulators[i].vselctrl_reg,
+				&regval) < 0) {
+				dev_err(&pdev->dev,
+					"Failed to read buck ctrl\n");
+				return -EIO;
+			}
+
+			if (regval & mt6397_regulators[i].vselctrl_mask) {
+				mt6397_regulators[i].desc.vsel_reg =
+				mt6397_regulators[i].vselon_reg;
+			}
+		}
+	}
+
+	return 0;
+}
+
+static int mt6397_regulator_probe(struct platform_device *pdev)
+{
+	struct mt6397_chip *mt6397 = dev_get_drvdata(pdev->dev.parent);
+	struct regulator_config config = {};
+	struct regulator_dev *rdev;
+	int i;
+	u32 reg_value, version;
+
+	/* Query buck controller to select activated voltage register part */
+	if (mt6397_set_buck_vosel_reg(pdev))
+		return -EIO;
+
+	/* Read PMIC chip revision to update constraints and voltage table */
+	if (regmap_read(mt6397->regmap, MT6397_CID, &reg_value) < 0) {
+		dev_err(&pdev->dev, "Failed to read Chip ID\n");
+		return -EIO;
+	}
+	dev_info(&pdev->dev, "Chip ID = 0x%x\n", reg_value);
+
+	version = (reg_value & 0xFF);
+	switch (version) {
+	case MT6397_REGULATOR_ID91:
+		mt6397_regulators[MT6397_ID_VGP2].desc.volt_table =
+		ldo_volt_table5_v2;
+		break;
+	default:
+		break;
+	}
+
+	for (i = 0; i < MT6397_MAX_REGULATOR; i++) {
+		config.dev = &pdev->dev;
+		config.driver_data = &mt6397_regulators[i];
+		config.regmap = mt6397->regmap;
+		rdev = devm_regulator_register(&pdev->dev,
+				&mt6397_regulators[i].desc, &config);
+		if (IS_ERR(rdev)) {
+			dev_err(&pdev->dev, "failed to register %s\n",
+				mt6397_regulators[i].desc.name);
+			return PTR_ERR(rdev);
+		}
+	}
+
+	return 0;
+}
+
+static struct platform_driver mt6397_regulator_driver = {
+	.driver = {
+		.name = "mt6397-regulator",
+	},
+	.probe = mt6397_regulator_probe,
+};
+
+module_platform_driver(mt6397_regulator_driver);
+
+MODULE_AUTHOR("Flora Fu <flora.fu@mediatek.com>");
+MODULE_DESCRIPTION("Regulator Driver for MediaTek MT6397 PMIC");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:mt6397-regulator");