regulator: add TPS6586X regulator driver

Signed-off-by: Mike Rapoport <mike@compulab.co.il>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>

3 files changed, 394 insertions, 0 deletions

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 6c14afd..93bf5fe 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -229,5 +229,11 @@ config REGULATOR_AB8500
 	  This driver supports the regulators found on the ST-Ericsson mixed
 	  signal AB8500 PMIC
 
+config REGULATOR_TPS6586X
+	tristate "TI TPS6586X Power regulators"
+	depends on I2C
+	help
+	  This driver supports TPS6586X voltage regulator chips.
+
 endif
 
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index fc696c5..8285fd8 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -24,6 +24,7 @@ obj-$(CONFIG_REGULATOR_WM831X) += wm831x-ldo.o
 obj-$(CONFIG_REGULATOR_WM8350) += wm8350-regulator.o
 obj-$(CONFIG_REGULATOR_WM8400) += wm8400-regulator.o
 obj-$(CONFIG_REGULATOR_WM8994) += wm8994-regulator.o
+obj-$(CONFIG_REGULATOR_TPS6586X) += tps6586x-regulator.o
 obj-$(CONFIG_REGULATOR_DA903X)	+= da903x.o
 obj-$(CONFIG_REGULATOR_PCF50633) += pcf50633-regulator.o
 obj-$(CONFIG_REGULATOR_PCAP) += pcap-regulator.o
diff --git a/drivers/regulator/tps6586x-regulator.c b/drivers/regulator/tps6586x-regulator.c
new file mode 100644
index 0000000..76cc41e
--- /dev/null
+++ b/drivers/regulator/tps6586x-regulator.c
@@ -0,0 +1,387 @@
+/*
+ * Regulator driver for TI TPS6586x
+ *
+ * Copyright (C) 2010 Compulab Ltd.
+ * Author: Mike Rapoport <mike@compulab.co.il>
+ *
+ * Based on da903x
+ * Copyright (C) 2006-2008 Marvell International Ltd.
+ * Copyright (C) 2008 Compulab Ltd.
+ *
+ * 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.
+ */
+
+#define DEBUG
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/mfd/tps6586x.h>
+
+/* supply control and voltage setting  */
+#define TPS6586X_SUPPLYENA	0x10
+#define TPS6586X_SUPPLYENB	0x11
+#define TPS6586X_SUPPLYENC	0x12
+#define TPS6586X_SUPPLYEND	0x13
+#define TPS6586X_SUPPLYENE	0x14
+#define TPS6586X_VCC1		0x20
+#define TPS6586X_VCC2		0x21
+#define TPS6586X_SM1V1		0x23
+#define TPS6586X_SM1V2		0x24
+#define TPS6586X_SM1SL		0x25
+#define TPS6586X_SM0V1		0x26
+#define TPS6586X_SM0V2		0x27
+#define TPS6586X_SM0SL		0x28
+#define TPS6586X_LDO2AV1	0x29
+#define TPS6586X_LDO2AV2	0x2A
+#define TPS6586X_LDO2BV1	0x2F
+#define TPS6586X_LDO2BV2	0x30
+#define TPS6586X_LDO4V1		0x32
+#define TPS6586X_LDO4V2		0x33
+
+/* converter settings  */
+#define TPS6586X_SUPPLYV1	0x41
+#define TPS6586X_SUPPLYV2	0x42
+#define TPS6586X_SUPPLYV3	0x43
+#define TPS6586X_SUPPLYV4	0x44
+#define TPS6586X_SUPPLYV5	0x45
+#define TPS6586X_SUPPLYV6	0x46
+#define TPS6586X_SMODE1		0x47
+#define TPS6586X_SMODE2		0x48
+
+struct tps6586x_regulator {
+	struct regulator_desc desc;
+
+	int volt_reg;
+	int volt_shift;
+	int volt_nbits;
+	int enable_bit[2];
+	int enable_reg[2];
+
+	int *voltages;
+
+	/* for DVM regulators */
+	int go_reg;
+	int go_bit;
+};
+
+static inline struct device *to_tps6586x_dev(struct regulator_dev *rdev)
+{
+	return rdev_get_dev(rdev)->parent->parent;
+}
+
+static int tps6586x_ldo_list_voltage(struct regulator_dev *rdev,
+				     unsigned selector)
+{
+	struct tps6586x_regulator *info = rdev_get_drvdata(rdev);
+
+	return info->voltages[selector];
+}
+
+
+static int __tps6586x_ldo_set_voltage(struct device *parent,
+				      struct tps6586x_regulator *ri,
+				      int min_uV, int max_uV)
+{
+	int val, uV;
+	uint8_t mask;
+
+	for (val = 0; val < ri->desc.n_voltages; val++) {
+		uV = ri->voltages[val] * 1000;
+
+		/* LDO0 has minimal voltage 1.2 rather than 1.25 */
+		if (ri->desc.id == TPS6586X_ID_LDO_0 && val == 0)
+			uV -= 50 * 1000;
+
+		/* use the first in-range value */
+		if (min_uV <= uV && uV <= max_uV) {
+
+			val <<= ri->volt_shift;
+			mask = ((1 << ri->volt_nbits) - 1) << ri->volt_shift;
+
+			return tps6586x_update(parent, ri->volt_reg, val, mask);
+		}
+	}
+
+	return -EINVAL;
+}
+
+static int tps6586x_ldo_set_voltage(struct regulator_dev *rdev,
+				    int min_uV, int max_uV)
+{
+	struct tps6586x_regulator *ri = rdev_get_drvdata(rdev);
+	struct device *parent = to_tps6586x_dev(rdev);
+
+	return __tps6586x_ldo_set_voltage(parent, ri, min_uV, max_uV);
+}
+
+static int tps6586x_ldo_get_voltage(struct regulator_dev *rdev)
+{
+	struct tps6586x_regulator *ri = rdev_get_drvdata(rdev);
+	struct device *parent = to_tps6586x_dev(rdev);
+	uint8_t val, mask;
+	int ret;
+
+	ret = tps6586x_read(parent, ri->volt_reg, &val);
+	if (ret)
+		return ret;
+
+	mask = ((1 << ri->volt_nbits) - 1) << ri->volt_shift;
+	val = (val & mask) >> ri->volt_shift;
+
+	if (val > ri->desc.n_voltages)
+		BUG();
+
+	return ri->voltages[val];
+}
+
+static int tps6586x_dvm_set_voltage(struct regulator_dev *rdev,
+				    int min_uV, int max_uV)
+{
+	struct tps6586x_regulator *ri = rdev_get_drvdata(rdev);
+	struct device *parent = to_tps6586x_dev(rdev);
+	int ret;
+
+	ret = __tps6586x_ldo_set_voltage(parent, ri, min_uV, max_uV);
+	if (ret)
+		return ret;
+
+	return tps6586x_set_bits(parent, ri->go_reg, ri->go_bit);
+}
+
+static int tps6586x_regulator_enable(struct regulator_dev *rdev)
+{
+	struct tps6586x_regulator *ri = rdev_get_drvdata(rdev);
+	struct device *parent = to_tps6586x_dev(rdev);
+
+	return tps6586x_set_bits(parent, ri->enable_reg[0],
+				 1 << ri->enable_bit[0]);
+}
+
+static int tps6586x_regulator_disable(struct regulator_dev *rdev)
+{
+	struct tps6586x_regulator *ri = rdev_get_drvdata(rdev);
+	struct device *parent = to_tps6586x_dev(rdev);
+
+	return tps6586x_clr_bits(parent, ri->enable_reg[0],
+				 1 << ri->enable_bit[0]);
+}
+
+static int tps6586x_regulator_is_enabled(struct regulator_dev *rdev)
+{
+	struct tps6586x_regulator *ri = rdev_get_drvdata(rdev);
+	struct device *parent = to_tps6586x_dev(rdev);
+	uint8_t reg_val;
+	int ret;
+
+	ret = tps6586x_read(parent, ri->enable_reg[0], &reg_val);
+	if (ret)
+		return ret;
+
+	return !!(reg_val & (1 << ri->enable_bit[0]));
+}
+
+static struct regulator_ops tps6586x_regulator_ldo_ops = {
+	.list_voltage = tps6586x_ldo_list_voltage,
+	.get_voltage = tps6586x_ldo_get_voltage,
+	.set_voltage = tps6586x_ldo_set_voltage,
+
+	.is_enabled = tps6586x_regulator_is_enabled,
+	.enable = tps6586x_regulator_enable,
+	.disable = tps6586x_regulator_disable,
+};
+
+static struct regulator_ops tps6586x_regulator_dvm_ops = {
+	.list_voltage = tps6586x_ldo_list_voltage,
+	.get_voltage = tps6586x_ldo_get_voltage,
+	.set_voltage = tps6586x_dvm_set_voltage,
+
+	.is_enabled = tps6586x_regulator_is_enabled,
+	.enable = tps6586x_regulator_enable,
+	.disable = tps6586x_regulator_disable,
+};
+
+static int tps6586x_ldo_voltages[] = {
+	1250, 1500, 1800, 2500, 2700, 2850, 3100, 3300,
+};
+
+static int tps6586x_ldo4_voltages[] = {
+	1700, 1725, 1750, 1775, 1800, 1825, 1850, 1875,
+	1900, 1925, 1950, 1975, 2000, 2025, 2050, 2075,
+	2100, 2125, 2150, 2175, 2200, 2225, 2250, 2275,
+	2300, 2325, 2350, 2375, 2400, 2425, 2450, 2475,
+};
+
+static int tps6586x_dvm_voltages[] = {
+	 725,  750,  775,  800,  825,  850,  875,  900,
+	 925,  950,  975, 1000, 1025, 1050, 1075, 1100,
+	1125, 1150, 1175, 1200, 1225, 1250, 1275, 1300,
+	1325, 1350, 1375, 1400, 1425, 1450, 1475, 1500,
+};
+
+#define TPS6586X_REGULATOR(_id, vdata, _ops, vreg, shift, nbits,	\
+			   ereg0, ebit0, ereg1, ebit1, goreg, gobit)	\
+{									\
+	.desc	= {							\
+		.name	= "REG-" #_id,					\
+		.ops	= &tps6586x_regulator_##_ops,			\
+		.type	= REGULATOR_VOLTAGE,				\
+		.id	= TPS6586X_ID_##_id,				\
+		.n_voltages = ARRAY_SIZE(tps6586x_##vdata##_voltages),	\
+		.owner	= THIS_MODULE,					\
+	},								\
+	.volt_reg	= TPS6586X_##vreg,				\
+	.volt_shift	= (shift),					\
+	.volt_nbits	= (nbits),					\
+	.enable_reg[0]	= TPS6586X_SUPPLY##ereg0,			\
+	.enable_bit[0]	= (ebit0),					\
+	.enable_reg[1]	= TPS6586X_SUPPLY##ereg1,			\
+	.enable_bit[1]	= (ebit1),					\
+	.voltages	= tps6586x_##vdata##_voltages,			\
+}
+
+#define TPS6586X_LDO(_id, vdata, vreg, shift, nbits,			\
+		     ereg0, ebit0, ereg1, ebit1)			\
+	TPS6586X_REGULATOR(_id, vdata, ldo_ops, vreg, shift, nbits,	\
+			   ereg0, ebit0, ereg1, ebit1, 0, 0)
+
+#define TPS6586X_DVM(_id, vdata, vreg, shift, nbits,			\
+		     ereg0, ebit0, ereg1, ebit1, goreg, gobit)		\
+	TPS6586X_REGULATOR(_id, vdata, dvm_ops, vreg, shift, nbits,	\
+			   ereg0, ebit0, ereg1, ebit1, goreg, gobit)
+
+static struct tps6586x_regulator tps6586x_regulator[] = {
+	TPS6586X_LDO(LDO_0, ldo, SUPPLYV1, 5, 3, ENC, 0, END, 0),
+	TPS6586X_LDO(LDO_3, ldo, SUPPLYV4, 0, 3, ENC, 2, END, 2),
+	TPS6586X_LDO(LDO_5, ldo, SUPPLYV6, 0, 3, ENE, 6, ENE, 6),
+	TPS6586X_LDO(LDO_6, ldo, SUPPLYV3, 0, 3, ENC, 4, END, 4),
+	TPS6586X_LDO(LDO_7, ldo, SUPPLYV3, 3, 3, ENC, 5, END, 5),
+	TPS6586X_LDO(LDO_8, ldo, SUPPLYV1, 5, 3, ENC, 6, END, 6),
+	TPS6586X_LDO(LDO_9, ldo, SUPPLYV6, 3, 3, ENE, 7, ENE, 7),
+	TPS6586X_LDO(LDO_RTC, ldo, SUPPLYV4, 3, 3, ENE, 7, ENE, 7),
+	TPS6586X_LDO(LDO_1, dvm, SUPPLYV1, 0, 5, ENC, 1, END, 1),
+	TPS6586X_LDO(SM_2, dvm, SUPPLYV2, 0, 5, ENC, 1, END, 1),
+
+	TPS6586X_DVM(LDO_2, dvm, LDO2BV1, 0, 5, ENA, 3, ENB, 3, VCC2, 6),
+	TPS6586X_DVM(LDO_4, ldo4, LDO4V1, 0, 5, ENC, 3, END, 3, VCC1, 6),
+	TPS6586X_DVM(SM_0, dvm, SM0V1, 0, 5, ENA, 1, ENB, 1, VCC1, 2),
+	TPS6586X_DVM(SM_1, dvm, SM1V1, 0, 5, ENA, 0, ENB, 0, VCC1, 0),
+};
+
+/*
+ * TPS6586X has 2 enable bits that are OR'ed to determine the actual
+ * regulator state. Clearing one of this bits allows switching
+ * regulator on and of with single register write.
+ */
+static inline int tps6586x_regulator_preinit(struct device *parent,
+					     struct tps6586x_regulator *ri)
+{
+	uint8_t val1, val2;
+	int ret;
+
+	ret = tps6586x_read(parent, ri->enable_reg[0], &val1);
+	if (ret)
+		return ret;
+
+	ret = tps6586x_read(parent, ri->enable_reg[1], &val2);
+	if (ret)
+		return ret;
+
+	if (!(val2 & ri->enable_bit[1]))
+		return 0;
+
+	/*
+	 * The regulator is on, but it's enabled with the bit we don't
+	 * want to use, so we switch the enable bits
+	 */
+	if (!(val1 & ri->enable_bit[0])) {
+		ret = tps6586x_set_bits(parent, ri->enable_reg[0],
+					1 << ri->enable_bit[0]);
+		if (ret)
+			return ret;
+	}
+
+	return tps6586x_clr_bits(parent, ri->enable_reg[1],
+				 1 << ri->enable_bit[1]);
+}
+
+static inline struct tps6586x_regulator *find_regulator_info(int id)
+{
+	struct tps6586x_regulator *ri;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(tps6586x_regulator); i++) {
+		ri = &tps6586x_regulator[i];
+		if (ri->desc.id == id)
+			return ri;
+	}
+	return NULL;
+}
+
+static int __devinit tps6586x_regulator_probe(struct platform_device *pdev)
+{
+	struct tps6586x_regulator *ri = NULL;
+	struct regulator_dev *rdev;
+	int id = pdev->id;
+	int err;
+
+	dev_dbg(&pdev->dev, "Probing reulator %d\n", id);
+
+	ri = find_regulator_info(id);
+	if (ri == NULL) {
+		dev_err(&pdev->dev, "invalid regulator ID specified\n");
+		return -EINVAL;
+	}
+
+	err = tps6586x_regulator_preinit(pdev->dev.parent, ri);
+	if (err)
+		return err;
+
+	rdev = regulator_register(&ri->desc, &pdev->dev,
+				  pdev->dev.platform_data, ri);
+	if (IS_ERR(rdev)) {
+		dev_err(&pdev->dev, "failed to register regulator %s\n",
+				ri->desc.name);
+		return PTR_ERR(rdev);
+	}
+
+	platform_set_drvdata(pdev, ri);
+
+	return 0;
+}
+
+static int __devexit tps6586x_regulator_remove(struct platform_device *pdev)
+{
+	return 0;
+}
+
+static struct platform_driver tps6586x_regulator_driver = {
+	.driver	= {
+		.name	= "tps6586x-regulator",
+		.owner	= THIS_MODULE,
+	},
+	.probe		= tps6586x_regulator_probe,
+	.remove		= __devexit_p(tps6586x_regulator_remove),
+};
+
+static int __init tps6586x_regulator_init(void)
+{
+	return platform_driver_register(&tps6586x_regulator_driver);
+}
+subsys_initcall(tps6586x_regulator_init);
+
+static void __exit tps6586x_regulator_exit(void)
+{
+	platform_driver_unregister(&tps6586x_regulator_driver);
+}
+module_exit(tps6586x_regulator_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
+MODULE_DESCRIPTION("Regulator Driver for TI TPS6586X PMIC");
+MODULE_ALIAS("platform:tps6586x-regulator");