Initial import

1 files changed, 554 insertions, 0 deletions

diff --git a/drivers/regulator/lp8788-buck.c b/drivers/regulator/lp8788-buck.c
new file mode 100644
index 000000000..a97bed90d
--- /dev/null
+++ b/drivers/regulator/lp8788-buck.c
@@ -0,0 +1,554 @@
+/*
+ * TI LP8788 MFD - buck regulator driver
+ *
+ * Copyright 2012 Texas Instruments
+ *
+ * Author: Milo(Woogyom) Kim <milo.kim@ti.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/module.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/mfd/lp8788.h>
+#include <linux/gpio.h>
+
+/* register address */
+#define LP8788_EN_BUCK			0x0C
+#define LP8788_BUCK_DVS_SEL		0x1D
+#define LP8788_BUCK1_VOUT0		0x1E
+#define LP8788_BUCK1_VOUT1		0x1F
+#define LP8788_BUCK1_VOUT2		0x20
+#define LP8788_BUCK1_VOUT3		0x21
+#define LP8788_BUCK2_VOUT0		0x22
+#define LP8788_BUCK2_VOUT1		0x23
+#define LP8788_BUCK2_VOUT2		0x24
+#define LP8788_BUCK2_VOUT3		0x25
+#define LP8788_BUCK3_VOUT		0x26
+#define LP8788_BUCK4_VOUT		0x27
+#define LP8788_BUCK1_TIMESTEP		0x28
+#define LP8788_BUCK_PWM			0x2D
+
+/* mask/shift bits */
+#define LP8788_EN_BUCK1_M		BIT(0)	/* Addr 0Ch */
+#define LP8788_EN_BUCK2_M		BIT(1)
+#define LP8788_EN_BUCK3_M		BIT(2)
+#define LP8788_EN_BUCK4_M		BIT(3)
+#define LP8788_BUCK1_DVS_SEL_M		0x04	/* Addr 1Dh */
+#define LP8788_BUCK1_DVS_M		0x03
+#define LP8788_BUCK1_DVS_S		0
+#define LP8788_BUCK2_DVS_SEL_M		0x40
+#define LP8788_BUCK2_DVS_M		0x30
+#define LP8788_BUCK2_DVS_S		4
+#define LP8788_BUCK1_DVS_I2C		BIT(2)
+#define LP8788_BUCK2_DVS_I2C		BIT(6)
+#define LP8788_BUCK1_DVS_PIN		(0 << 2)
+#define LP8788_BUCK2_DVS_PIN		(0 << 6)
+#define LP8788_VOUT_M			0x1F	/* Addr 1Eh ~ 27h */
+#define LP8788_STARTUP_TIME_M		0xF8	/* Addr 28h ~ 2Bh */
+#define LP8788_STARTUP_TIME_S		3
+#define LP8788_FPWM_BUCK1_M		BIT(0)	/* Addr 2Dh */
+#define LP8788_FPWM_BUCK1_S		0
+#define LP8788_FPWM_BUCK2_M		BIT(1)
+#define LP8788_FPWM_BUCK2_S		1
+#define LP8788_FPWM_BUCK3_M		BIT(2)
+#define LP8788_FPWM_BUCK3_S		2
+#define LP8788_FPWM_BUCK4_M		BIT(3)
+#define LP8788_FPWM_BUCK4_S		3
+
+#define INVALID_ADDR			0xFF
+#define LP8788_FORCE_PWM		1
+#define LP8788_AUTO_PWM			0
+#define PIN_LOW				0
+#define PIN_HIGH			1
+#define ENABLE_TIME_USEC		32
+
+#define BUCK_FPWM_MASK(x)		(1 << (x))
+#define BUCK_FPWM_SHIFT(x)		(x)
+
+enum lp8788_dvs_state {
+	DVS_LOW  = GPIOF_OUT_INIT_LOW,
+	DVS_HIGH = GPIOF_OUT_INIT_HIGH,
+};
+
+enum lp8788_dvs_mode {
+	REGISTER,
+	EXTPIN,
+};
+
+enum lp8788_buck_id {
+	BUCK1,
+	BUCK2,
+	BUCK3,
+	BUCK4,
+};
+
+struct lp8788_buck {
+	struct lp8788 *lp;
+	struct regulator_dev *regulator;
+	void *dvs;
+};
+
+/* BUCK 1 ~ 4 voltage table */
+static const int lp8788_buck_vtbl[] = {
+	 500000,  800000,  850000,  900000,  950000, 1000000, 1050000, 1100000,
+	1150000, 1200000, 1250000, 1300000, 1350000, 1400000, 1450000, 1500000,
+	1550000, 1600000, 1650000, 1700000, 1750000, 1800000, 1850000, 1900000,
+	1950000, 2000000,
+};
+
+static void lp8788_buck1_set_dvs(struct lp8788_buck *buck)
+{
+	struct lp8788_buck1_dvs *dvs = (struct lp8788_buck1_dvs *)buck->dvs;
+	enum lp8788_dvs_state pinstate;
+
+	if (!dvs)
+		return;
+
+	pinstate = dvs->vsel == DVS_SEL_V0 ? DVS_LOW : DVS_HIGH;
+	if (gpio_is_valid(dvs->gpio))
+		gpio_set_value(dvs->gpio, pinstate);
+}
+
+static void lp8788_buck2_set_dvs(struct lp8788_buck *buck)
+{
+	struct lp8788_buck2_dvs *dvs = (struct lp8788_buck2_dvs *)buck->dvs;
+	enum lp8788_dvs_state pin1, pin2;
+
+	if (!dvs)
+		return;
+
+	switch (dvs->vsel) {
+	case DVS_SEL_V0:
+		pin1 = DVS_LOW;
+		pin2 = DVS_LOW;
+		break;
+	case DVS_SEL_V1:
+		pin1 = DVS_HIGH;
+		pin2 = DVS_LOW;
+		break;
+	case DVS_SEL_V2:
+		pin1 = DVS_LOW;
+		pin2 = DVS_HIGH;
+		break;
+	case DVS_SEL_V3:
+		pin1 = DVS_HIGH;
+		pin2 = DVS_HIGH;
+		break;
+	default:
+		return;
+	}
+
+	if (gpio_is_valid(dvs->gpio[0]))
+		gpio_set_value(dvs->gpio[0], pin1);
+
+	if (gpio_is_valid(dvs->gpio[1]))
+		gpio_set_value(dvs->gpio[1], pin2);
+}
+
+static void lp8788_set_dvs(struct lp8788_buck *buck, enum lp8788_buck_id id)
+{
+	switch (id) {
+	case BUCK1:
+		lp8788_buck1_set_dvs(buck);
+		break;
+	case BUCK2:
+		lp8788_buck2_set_dvs(buck);
+		break;
+	default:
+		break;
+	}
+}
+
+static enum lp8788_dvs_mode
+lp8788_get_buck_dvs_ctrl_mode(struct lp8788_buck *buck, enum lp8788_buck_id id)
+{
+	u8 val, mask;
+
+	switch (id) {
+	case BUCK1:
+		mask = LP8788_BUCK1_DVS_SEL_M;
+		break;
+	case BUCK2:
+		mask = LP8788_BUCK2_DVS_SEL_M;
+		break;
+	default:
+		return REGISTER;
+	}
+
+	lp8788_read_byte(buck->lp, LP8788_BUCK_DVS_SEL, &val);
+
+	return val & mask ? REGISTER : EXTPIN;
+}
+
+static bool lp8788_is_valid_buck_addr(u8 addr)
+{
+	switch (addr) {
+	case LP8788_BUCK1_VOUT0:
+	case LP8788_BUCK1_VOUT1:
+	case LP8788_BUCK1_VOUT2:
+	case LP8788_BUCK1_VOUT3:
+	case LP8788_BUCK2_VOUT0:
+	case LP8788_BUCK2_VOUT1:
+	case LP8788_BUCK2_VOUT2:
+	case LP8788_BUCK2_VOUT3:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static u8 lp8788_select_buck_vout_addr(struct lp8788_buck *buck,
+					enum lp8788_buck_id id)
+{
+	enum lp8788_dvs_mode mode = lp8788_get_buck_dvs_ctrl_mode(buck, id);
+	struct lp8788_buck1_dvs *b1_dvs;
+	struct lp8788_buck2_dvs *b2_dvs;
+	u8 val, idx, addr;
+	int pin1, pin2;
+
+	switch (id) {
+	case BUCK1:
+		if (mode == EXTPIN) {
+			b1_dvs = (struct lp8788_buck1_dvs *)buck->dvs;
+			if (!b1_dvs)
+				goto err;
+
+			idx = gpio_get_value(b1_dvs->gpio) ? 1 : 0;
+		} else {
+			lp8788_read_byte(buck->lp, LP8788_BUCK_DVS_SEL, &val);
+			idx = (val & LP8788_BUCK1_DVS_M) >> LP8788_BUCK1_DVS_S;
+		}
+		addr = LP8788_BUCK1_VOUT0 + idx;
+		break;
+	case BUCK2:
+		if (mode == EXTPIN) {
+			b2_dvs = (struct lp8788_buck2_dvs *)buck->dvs;
+			if (!b2_dvs)
+				goto err;
+
+			pin1 = gpio_get_value(b2_dvs->gpio[0]);
+			pin2 = gpio_get_value(b2_dvs->gpio[1]);
+
+			if (pin1 == PIN_LOW && pin2 == PIN_LOW)
+				idx = 0;
+			else if (pin1 == PIN_LOW && pin2 == PIN_HIGH)
+				idx = 2;
+			else if (pin1 == PIN_HIGH && pin2 == PIN_LOW)
+				idx = 1;
+			else
+				idx = 3;
+		} else {
+			lp8788_read_byte(buck->lp, LP8788_BUCK_DVS_SEL, &val);
+			idx = (val & LP8788_BUCK2_DVS_M) >> LP8788_BUCK2_DVS_S;
+		}
+		addr = LP8788_BUCK2_VOUT0 + idx;
+		break;
+	default:
+		goto err;
+	}
+
+	return addr;
+err:
+	return INVALID_ADDR;
+}
+
+static int lp8788_buck12_set_voltage_sel(struct regulator_dev *rdev,
+					unsigned selector)
+{
+	struct lp8788_buck *buck = rdev_get_drvdata(rdev);
+	enum lp8788_buck_id id = rdev_get_id(rdev);
+	u8 addr;
+
+	if (buck->dvs)
+		lp8788_set_dvs(buck, id);
+
+	addr = lp8788_select_buck_vout_addr(buck, id);
+	if (!lp8788_is_valid_buck_addr(addr))
+		return -EINVAL;
+
+	return lp8788_update_bits(buck->lp, addr, LP8788_VOUT_M, selector);
+}
+
+static int lp8788_buck12_get_voltage_sel(struct regulator_dev *rdev)
+{
+	struct lp8788_buck *buck = rdev_get_drvdata(rdev);
+	enum lp8788_buck_id id = rdev_get_id(rdev);
+	int ret;
+	u8 val, addr;
+
+	addr = lp8788_select_buck_vout_addr(buck, id);
+	if (!lp8788_is_valid_buck_addr(addr))
+		return -EINVAL;
+
+	ret = lp8788_read_byte(buck->lp, addr, &val);
+	if (ret)
+		return ret;
+
+	return val & LP8788_VOUT_M;
+}
+
+static int lp8788_buck_enable_time(struct regulator_dev *rdev)
+{
+	struct lp8788_buck *buck = rdev_get_drvdata(rdev);
+	enum lp8788_buck_id id = rdev_get_id(rdev);
+	u8 val, addr = LP8788_BUCK1_TIMESTEP + id;
+
+	if (lp8788_read_byte(buck->lp, addr, &val))
+		return -EINVAL;
+
+	val = (val & LP8788_STARTUP_TIME_M) >> LP8788_STARTUP_TIME_S;
+
+	return ENABLE_TIME_USEC * val;
+}
+
+static int lp8788_buck_set_mode(struct regulator_dev *rdev, unsigned int mode)
+{
+	struct lp8788_buck *buck = rdev_get_drvdata(rdev);
+	enum lp8788_buck_id id = rdev_get_id(rdev);
+	u8 mask, val;
+
+	mask = BUCK_FPWM_MASK(id);
+	switch (mode) {
+	case REGULATOR_MODE_FAST:
+		val = LP8788_FORCE_PWM << BUCK_FPWM_SHIFT(id);
+		break;
+	case REGULATOR_MODE_NORMAL:
+		val = LP8788_AUTO_PWM << BUCK_FPWM_SHIFT(id);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return lp8788_update_bits(buck->lp, LP8788_BUCK_PWM, mask, val);
+}
+
+static unsigned int lp8788_buck_get_mode(struct regulator_dev *rdev)
+{
+	struct lp8788_buck *buck = rdev_get_drvdata(rdev);
+	enum lp8788_buck_id id = rdev_get_id(rdev);
+	u8 val;
+	int ret;
+
+	ret = lp8788_read_byte(buck->lp, LP8788_BUCK_PWM, &val);
+	if (ret)
+		return ret;
+
+	return val & BUCK_FPWM_MASK(id) ?
+				REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;
+}
+
+static struct regulator_ops lp8788_buck12_ops = {
+	.list_voltage = regulator_list_voltage_table,
+	.map_voltage = regulator_map_voltage_ascend,
+	.set_voltage_sel = lp8788_buck12_set_voltage_sel,
+	.get_voltage_sel = lp8788_buck12_get_voltage_sel,
+	.enable = regulator_enable_regmap,
+	.disable = regulator_disable_regmap,
+	.is_enabled = regulator_is_enabled_regmap,
+	.enable_time = lp8788_buck_enable_time,
+	.set_mode = lp8788_buck_set_mode,
+	.get_mode = lp8788_buck_get_mode,
+};
+
+static struct regulator_ops lp8788_buck34_ops = {
+	.list_voltage = regulator_list_voltage_table,
+	.map_voltage = regulator_map_voltage_ascend,
+	.set_voltage_sel = regulator_set_voltage_sel_regmap,
+	.get_voltage_sel = regulator_get_voltage_sel_regmap,
+	.enable = regulator_enable_regmap,
+	.disable = regulator_disable_regmap,
+	.is_enabled = regulator_is_enabled_regmap,
+	.enable_time = lp8788_buck_enable_time,
+	.set_mode = lp8788_buck_set_mode,
+	.get_mode = lp8788_buck_get_mode,
+};
+
+static struct regulator_desc lp8788_buck_desc[] = {
+	{
+		.name = "buck1",
+		.id = BUCK1,
+		.ops = &lp8788_buck12_ops,
+		.n_voltages = ARRAY_SIZE(lp8788_buck_vtbl),
+		.volt_table = lp8788_buck_vtbl,
+		.type = REGULATOR_VOLTAGE,
+		.owner = THIS_MODULE,
+		.enable_reg = LP8788_EN_BUCK,
+		.enable_mask = LP8788_EN_BUCK1_M,
+	},
+	{
+		.name = "buck2",
+		.id = BUCK2,
+		.ops = &lp8788_buck12_ops,
+		.n_voltages = ARRAY_SIZE(lp8788_buck_vtbl),
+		.volt_table = lp8788_buck_vtbl,
+		.type = REGULATOR_VOLTAGE,
+		.owner = THIS_MODULE,
+		.enable_reg = LP8788_EN_BUCK,
+		.enable_mask = LP8788_EN_BUCK2_M,
+	},
+	{
+		.name = "buck3",
+		.id = BUCK3,
+		.ops = &lp8788_buck34_ops,
+		.n_voltages = ARRAY_SIZE(lp8788_buck_vtbl),
+		.volt_table = lp8788_buck_vtbl,
+		.type = REGULATOR_VOLTAGE,
+		.owner = THIS_MODULE,
+		.vsel_reg = LP8788_BUCK3_VOUT,
+		.vsel_mask = LP8788_VOUT_M,
+		.enable_reg = LP8788_EN_BUCK,
+		.enable_mask = LP8788_EN_BUCK3_M,
+	},
+	{
+		.name = "buck4",
+		.id = BUCK4,
+		.ops = &lp8788_buck34_ops,
+		.n_voltages = ARRAY_SIZE(lp8788_buck_vtbl),
+		.volt_table = lp8788_buck_vtbl,
+		.type = REGULATOR_VOLTAGE,
+		.owner = THIS_MODULE,
+		.vsel_reg = LP8788_BUCK4_VOUT,
+		.vsel_mask = LP8788_VOUT_M,
+		.enable_reg = LP8788_EN_BUCK,
+		.enable_mask = LP8788_EN_BUCK4_M,
+	},
+};
+
+static int lp8788_dvs_gpio_request(struct platform_device *pdev,
+				struct lp8788_buck *buck,
+				enum lp8788_buck_id id)
+{
+	struct lp8788_platform_data *pdata = buck->lp->pdata;
+	char *b1_name = "LP8788_B1_DVS";
+	char *b2_name[] = { "LP8788_B2_DVS1", "LP8788_B2_DVS2" };
+	int i, gpio, ret;
+
+	switch (id) {
+	case BUCK1:
+		gpio = pdata->buck1_dvs->gpio;
+		ret = devm_gpio_request_one(&pdev->dev, gpio, DVS_LOW,
+					    b1_name);
+		if (ret)
+			return ret;
+
+		buck->dvs = pdata->buck1_dvs;
+		break;
+	case BUCK2:
+		for (i = 0; i < LP8788_NUM_BUCK2_DVS; i++) {
+			gpio = pdata->buck2_dvs->gpio[i];
+			ret = devm_gpio_request_one(&pdev->dev, gpio,
+						    DVS_LOW, b2_name[i]);
+			if (ret)
+				return ret;
+		}
+		buck->dvs = pdata->buck2_dvs;
+		break;
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+static int lp8788_init_dvs(struct platform_device *pdev,
+			struct lp8788_buck *buck, enum lp8788_buck_id id)
+{
+	struct lp8788_platform_data *pdata = buck->lp->pdata;
+	u8 mask[] = { LP8788_BUCK1_DVS_SEL_M, LP8788_BUCK2_DVS_SEL_M };
+	u8 val[]  = { LP8788_BUCK1_DVS_PIN, LP8788_BUCK2_DVS_PIN };
+	u8 default_dvs_mode[] = { LP8788_BUCK1_DVS_I2C, LP8788_BUCK2_DVS_I2C };
+
+	/* no dvs for buck3, 4 */
+	if (id > BUCK2)
+		return 0;
+
+	/* no dvs platform data, then dvs will be selected by I2C registers */
+	if (!pdata)
+		goto set_default_dvs_mode;
+
+	if ((id == BUCK1 && !pdata->buck1_dvs) ||
+		(id == BUCK2 && !pdata->buck2_dvs))
+		goto set_default_dvs_mode;
+
+	if (lp8788_dvs_gpio_request(pdev, buck, id))
+		goto set_default_dvs_mode;
+
+	return lp8788_update_bits(buck->lp, LP8788_BUCK_DVS_SEL, mask[id],
+				val[id]);
+
+set_default_dvs_mode:
+	return lp8788_update_bits(buck->lp, LP8788_BUCK_DVS_SEL, mask[id],
+				  default_dvs_mode[id]);
+}
+
+static int lp8788_buck_probe(struct platform_device *pdev)
+{
+	struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent);
+	int id = pdev->id;
+	struct lp8788_buck *buck;
+	struct regulator_config cfg = { };
+	struct regulator_dev *rdev;
+	int ret;
+
+	if (id >= LP8788_NUM_BUCKS)
+		return -EINVAL;
+
+	buck = devm_kzalloc(&pdev->dev, sizeof(struct lp8788_buck), GFP_KERNEL);
+	if (!buck)
+		return -ENOMEM;
+
+	buck->lp = lp;
+
+	ret = lp8788_init_dvs(pdev, buck, id);
+	if (ret)
+		return ret;
+
+	cfg.dev = pdev->dev.parent;
+	cfg.init_data = lp->pdata ? lp->pdata->buck_data[id] : NULL;
+	cfg.driver_data = buck;
+	cfg.regmap = lp->regmap;
+
+	rdev = devm_regulator_register(&pdev->dev, &lp8788_buck_desc[id], &cfg);
+	if (IS_ERR(rdev)) {
+		ret = PTR_ERR(rdev);
+		dev_err(&pdev->dev, "BUCK%d regulator register err = %d\n",
+				id + 1, ret);
+		return ret;
+	}
+
+	buck->regulator = rdev;
+	platform_set_drvdata(pdev, buck);
+
+	return 0;
+}
+
+static struct platform_driver lp8788_buck_driver = {
+	.probe = lp8788_buck_probe,
+	.driver = {
+		.name = LP8788_DEV_BUCK,
+	},
+};
+
+static int __init lp8788_buck_init(void)
+{
+	return platform_driver_register(&lp8788_buck_driver);
+}
+subsys_initcall(lp8788_buck_init);
+
+static void __exit lp8788_buck_exit(void)
+{
+	platform_driver_unregister(&lp8788_buck_driver);
+}
+module_exit(lp8788_buck_exit);
+
+MODULE_DESCRIPTION("TI LP8788 BUCK Driver");
+MODULE_AUTHOR("Milo Kim");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:lp8788-buck");