diff options
Diffstat (limited to 'drivers/regulator/lp8788-buck.c')
| -rw-r--r-- | drivers/regulator/lp8788-buck.c | 579 |
1 files changed, 579 insertions, 0 deletions
diff --git a/drivers/regulator/lp8788-buck.c b/drivers/regulator/lp8788-buck.c new file mode 100644 index 00000000000..ba3e0aa402d --- /dev/null +++ b/drivers/regulator/lp8788-buck.c @@ -0,0 +1,579 @@ +/* + * 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 const u8 buck1_vout_addr[] = { + LP8788_BUCK1_VOUT0, LP8788_BUCK1_VOUT1, + LP8788_BUCK1_VOUT2, LP8788_BUCK1_VOUT3, +}; + +static const u8 buck2_vout_addr[] = { + LP8788_BUCK2_VOUT0, LP8788_BUCK2_VOUT1, + LP8788_BUCK2_VOUT2, LP8788_BUCK2_VOUT3, +}; + +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 = buck1_vout_addr[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 = buck2_vout_addr[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, + .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, + .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 _gpio_request(struct lp8788_buck *buck, int gpio, char *name) +{ + struct device *dev = buck->lp->dev; + + if (!gpio_is_valid(gpio)) { + dev_err(dev, "invalid gpio: %d\n", gpio); + return -EINVAL; + } + + return devm_gpio_request_one(dev, gpio, DVS_LOW, name); +} + +static int lp8788_dvs_gpio_request(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 = _gpio_request(buck, gpio, 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 = _gpio_request(buck, gpio, b2_name[i]); + if (ret) + return ret; + } + buck->dvs = pdata->buck2_dvs; + break; + default: + break; + } + + return 0; +} + +static int lp8788_init_dvs(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 == BUCK3 || id == BUCK4) + 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(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 __devinit 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; + + buck = devm_kzalloc(lp->dev, sizeof(struct lp8788_buck), GFP_KERNEL); + if (!buck) + return -ENOMEM; + + buck->lp = lp; + + ret = lp8788_init_dvs(buck, id); + if (ret) + return ret; + + cfg.dev = lp->dev; + cfg.init_data = lp->pdata ? lp->pdata->buck_data[id] : NULL; + cfg.driver_data = buck; + cfg.regmap = lp->regmap; + + rdev = regulator_register(&lp8788_buck_desc[id], &cfg); + if (IS_ERR(rdev)) { + ret = PTR_ERR(rdev); + dev_err(lp->dev, "BUCK%d regulator register err = %d\n", + id + 1, ret); + return ret; + } + + buck->regulator = rdev; + platform_set_drvdata(pdev, buck); + + return 0; +} + +static int __devexit lp8788_buck_remove(struct platform_device *pdev) +{ + struct lp8788_buck *buck = platform_get_drvdata(pdev); + + platform_set_drvdata(pdev, NULL); + regulator_unregister(buck->regulator); + + return 0; +} + +static struct platform_driver lp8788_buck_driver = { + .probe = lp8788_buck_probe, + .remove = __devexit_p(lp8788_buck_remove), + .driver = { + .name = LP8788_DEV_BUCK, + .owner = THIS_MODULE, + }, +}; + +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"); |