diff options
Diffstat (limited to 'drivers/regulator/da9055-regulator.c')
| -rw-r--r-- | drivers/regulator/da9055-regulator.c | 641 |
1 files changed, 641 insertions, 0 deletions
diff --git a/drivers/regulator/da9055-regulator.c b/drivers/regulator/da9055-regulator.c new file mode 100644 index 000000000000..1a05ac66878f --- /dev/null +++ b/drivers/regulator/da9055-regulator.c @@ -0,0 +1,641 @@ +/* +* Regulator driver for DA9055 PMIC +* +* Copyright(c) 2012 Dialog Semiconductor Ltd. +* +* Author: David Dajun Chen <dchen@diasemi.com> +* +* This program is free software; you can redistribute it and/or modify +* it under the terms of the GNU General Public License as published by +* the Free Software Foundation; either version 2 of the License, or +* (at your option) any later version. +* +*/ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/err.h> +#include <linux/gpio.h> +#include <linux/platform_device.h> +#include <linux/regulator/driver.h> +#include <linux/regulator/machine.h> + +#include <linux/mfd/da9055/core.h> +#include <linux/mfd/da9055/reg.h> +#include <linux/mfd/da9055/pdata.h> + +#define DA9055_MIN_UA 0 +#define DA9055_MAX_UA 3 + +#define DA9055_LDO_MODE_SYNC 0 +#define DA9055_LDO_MODE_SLEEP 1 + +#define DA9055_BUCK_MODE_SLEEP 1 +#define DA9055_BUCK_MODE_SYNC 2 +#define DA9055_BUCK_MODE_AUTO 3 + +/* DA9055 REGULATOR IDs */ +#define DA9055_ID_BUCK1 0 +#define DA9055_ID_BUCK2 1 +#define DA9055_ID_LDO1 2 +#define DA9055_ID_LDO2 3 +#define DA9055_ID_LDO3 4 +#define DA9055_ID_LDO4 5 +#define DA9055_ID_LDO5 6 +#define DA9055_ID_LDO6 7 + +/* DA9055 BUCK current limit */ +static const int da9055_current_limits[] = { 500000, 600000, 700000, 800000 }; + +struct da9055_conf_reg { + int reg; + int sel_mask; + int en_mask; +}; + +struct da9055_volt_reg { + int reg_a; + int reg_b; + int sl_shift; + int v_mask; + int v_shift; +}; + +struct da9055_mode_reg { + int reg; + int mask; + int shift; +}; + +struct da9055_regulator_info { + struct regulator_desc reg_desc; + struct da9055_conf_reg conf; + struct da9055_volt_reg volt; + struct da9055_mode_reg mode; +}; + +struct da9055_regulator { + struct da9055 *da9055; + struct da9055_regulator_info *info; + struct regulator_dev *rdev; + enum gpio_select reg_rselect; +}; + +static unsigned int da9055_buck_get_mode(struct regulator_dev *rdev) +{ + struct da9055_regulator *regulator = rdev_get_drvdata(rdev); + struct da9055_regulator_info *info = regulator->info; + int ret, mode = 0; + + ret = da9055_reg_read(regulator->da9055, info->mode.reg); + if (ret < 0) + return ret; + + switch ((ret & info->mode.mask) >> info->mode.shift) { + case DA9055_BUCK_MODE_SYNC: + mode = REGULATOR_MODE_FAST; + break; + case DA9055_BUCK_MODE_AUTO: + mode = REGULATOR_MODE_NORMAL; + break; + case DA9055_BUCK_MODE_SLEEP: + mode = REGULATOR_MODE_STANDBY; + break; + } + + return mode; +} + +static int da9055_buck_set_mode(struct regulator_dev *rdev, + unsigned int mode) +{ + struct da9055_regulator *regulator = rdev_get_drvdata(rdev); + struct da9055_regulator_info *info = regulator->info; + int val = 0; + + switch (mode) { + case REGULATOR_MODE_FAST: + val = DA9055_BUCK_MODE_SYNC << info->mode.shift; + break; + case REGULATOR_MODE_NORMAL: + val = DA9055_BUCK_MODE_AUTO << info->mode.shift; + break; + case REGULATOR_MODE_STANDBY: + val = DA9055_BUCK_MODE_SLEEP << info->mode.shift; + break; + } + + return da9055_reg_update(regulator->da9055, info->mode.reg, + info->mode.mask, val); +} + +static unsigned int da9055_ldo_get_mode(struct regulator_dev *rdev) +{ + struct da9055_regulator *regulator = rdev_get_drvdata(rdev); + struct da9055_regulator_info *info = regulator->info; + int ret; + + ret = da9055_reg_read(regulator->da9055, info->volt.reg_b); + if (ret < 0) + return ret; + + if (ret >> info->volt.sl_shift) + return REGULATOR_MODE_STANDBY; + else + return REGULATOR_MODE_NORMAL; +} + +static int da9055_ldo_set_mode(struct regulator_dev *rdev, unsigned int mode) +{ + struct da9055_regulator *regulator = rdev_get_drvdata(rdev); + struct da9055_regulator_info *info = regulator->info; + struct da9055_volt_reg volt = info->volt; + int val = 0; + + switch (mode) { + case REGULATOR_MODE_NORMAL: + case REGULATOR_MODE_FAST: + val = DA9055_LDO_MODE_SYNC; + break; + case REGULATOR_MODE_STANDBY: + val = DA9055_LDO_MODE_SLEEP; + break; + } + + return da9055_reg_update(regulator->da9055, volt.reg_b, + 1 << volt.sl_shift, + val << volt.sl_shift); +} + +static int da9055_buck_get_current_limit(struct regulator_dev *rdev) +{ + struct da9055_regulator *regulator = rdev_get_drvdata(rdev); + struct da9055_regulator_info *info = regulator->info; + int ret; + + ret = da9055_reg_read(regulator->da9055, DA9055_REG_BUCK_LIM); + if (ret < 0) + return ret; + + ret &= info->mode.mask; + return da9055_current_limits[ret >> info->mode.shift]; +} + +static int da9055_buck_set_current_limit(struct regulator_dev *rdev, int min_uA, + int max_uA) +{ + struct da9055_regulator *regulator = rdev_get_drvdata(rdev); + struct da9055_regulator_info *info = regulator->info; + int i; + + for (i = ARRAY_SIZE(da9055_current_limits) - 1; i >= 0; i--) { + if ((min_uA <= da9055_current_limits[i]) && + (da9055_current_limits[i] <= max_uA)) + return da9055_reg_update(regulator->da9055, + DA9055_REG_BUCK_LIM, + info->mode.mask, + i << info->mode.shift); + } + + return -EINVAL; +} + +static int da9055_regulator_get_voltage_sel(struct regulator_dev *rdev) +{ + struct da9055_regulator *regulator = rdev_get_drvdata(rdev); + struct da9055_regulator_info *info = regulator->info; + struct da9055_volt_reg volt = info->volt; + int ret, sel; + + /* + * There are two voltage register set A & B for voltage ramping but + * either one of then can be active therefore we first determine + * the active register set. + */ + ret = da9055_reg_read(regulator->da9055, info->conf.reg); + if (ret < 0) + return ret; + + ret &= info->conf.sel_mask; + + /* Get the voltage for the active register set A/B */ + if (ret == DA9055_REGUALTOR_SET_A) + ret = da9055_reg_read(regulator->da9055, volt.reg_a); + else + ret = da9055_reg_read(regulator->da9055, volt.reg_b); + + if (ret < 0) + return ret; + + sel = (ret & volt.v_mask); + return sel; +} + +static int da9055_regulator_set_voltage_sel(struct regulator_dev *rdev, + unsigned int selector) +{ + struct da9055_regulator *regulator = rdev_get_drvdata(rdev); + struct da9055_regulator_info *info = regulator->info; + int ret; + + /* + * Regulator register set A/B is not selected through GPIO therefore + * we use default register set A for voltage ramping. + */ + if (regulator->reg_rselect == NO_GPIO) { + /* Select register set A */ + ret = da9055_reg_update(regulator->da9055, info->conf.reg, + info->conf.sel_mask, DA9055_SEL_REG_A); + if (ret < 0) + return ret; + + /* Set the voltage */ + return da9055_reg_update(regulator->da9055, info->volt.reg_a, + info->volt.v_mask, selector); + } + + /* + * Here regulator register set A/B is selected through GPIO. + * Therefore we first determine the selected register set A/B and + * then set the desired voltage for that register set A/B. + */ + ret = da9055_reg_read(regulator->da9055, info->conf.reg); + if (ret < 0) + return ret; + + ret &= info->conf.sel_mask; + + /* Set the voltage */ + if (ret == DA9055_REGUALTOR_SET_A) + return da9055_reg_update(regulator->da9055, info->volt.reg_a, + info->volt.v_mask, selector); + else + return da9055_reg_update(regulator->da9055, info->volt.reg_b, + info->volt.v_mask, selector); +} + +static int da9055_regulator_set_suspend_voltage(struct regulator_dev *rdev, + int uV) +{ + struct da9055_regulator *regulator = rdev_get_drvdata(rdev); + struct da9055_regulator_info *info = regulator->info; + int ret; + + /* Select register set B for suspend voltage ramping. */ + if (regulator->reg_rselect == NO_GPIO) { + ret = da9055_reg_update(regulator->da9055, info->conf.reg, + info->conf.sel_mask, DA9055_SEL_REG_B); + if (ret < 0) + return ret; + } + + ret = regulator_map_voltage_linear(rdev, uV, uV); + if (ret < 0) + return ret; + + return da9055_reg_update(regulator->da9055, info->volt.reg_b, + info->volt.v_mask, ret); +} + +static int da9055_suspend_enable(struct regulator_dev *rdev) +{ + struct da9055_regulator *regulator = rdev_get_drvdata(rdev); + struct da9055_regulator_info *info = regulator->info; + + /* Select register set B for voltage ramping. */ + if (regulator->reg_rselect == NO_GPIO) + return da9055_reg_update(regulator->da9055, info->conf.reg, + info->conf.sel_mask, DA9055_SEL_REG_B); + else + return 0; +} + +static int da9055_suspend_disable(struct regulator_dev *rdev) +{ + struct da9055_regulator *regulator = rdev_get_drvdata(rdev); + struct da9055_regulator_info *info = regulator->info; + + /* Diselect register set B. */ + if (regulator->reg_rselect == NO_GPIO) + return da9055_reg_update(regulator->da9055, info->conf.reg, + info->conf.sel_mask, DA9055_SEL_REG_A); + else + return 0; +} + +static struct regulator_ops da9055_buck_ops = { + .get_mode = da9055_buck_get_mode, + .set_mode = da9055_buck_set_mode, + + .get_current_limit = da9055_buck_get_current_limit, + .set_current_limit = da9055_buck_set_current_limit, + + .get_voltage_sel = da9055_regulator_get_voltage_sel, + .set_voltage_sel = da9055_regulator_set_voltage_sel, + .list_voltage = regulator_list_voltage_linear, + .map_voltage = regulator_map_voltage_linear, + .is_enabled = regulator_is_enabled_regmap, + .enable = regulator_enable_regmap, + .disable = regulator_disable_regmap, + + .set_suspend_voltage = da9055_regulator_set_suspend_voltage, + .set_suspend_enable = da9055_suspend_enable, + .set_suspend_disable = da9055_suspend_disable, + .set_suspend_mode = da9055_buck_set_mode, +}; + +static struct regulator_ops da9055_ldo_ops = { + .get_mode = da9055_ldo_get_mode, + .set_mode = da9055_ldo_set_mode, + + .get_voltage_sel = da9055_regulator_get_voltage_sel, + .set_voltage_sel = da9055_regulator_set_voltage_sel, + .list_voltage = regulator_list_voltage_linear, + .map_voltage = regulator_map_voltage_linear, + .is_enabled = regulator_is_enabled_regmap, + .enable = regulator_enable_regmap, + .disable = regulator_disable_regmap, + + .set_suspend_voltage = da9055_regulator_set_suspend_voltage, + .set_suspend_enable = da9055_suspend_enable, + .set_suspend_disable = da9055_suspend_disable, + .set_suspend_mode = da9055_ldo_set_mode, + +}; + +#define DA9055_LDO(_id, step, min, max, vbits, voffset) \ +{\ + .reg_desc = {\ + .name = #_id,\ + .ops = &da9055_ldo_ops,\ + .type = REGULATOR_VOLTAGE,\ + .id = DA9055_ID_##_id,\ + .n_voltages = (max - min) / step + 1 + (voffset), \ + .enable_reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \ + .enable_mask = 1, \ + .min_uV = (min) * 1000,\ + .uV_step = (step) * 1000,\ + .linear_min_sel = (voffset),\ + .owner = THIS_MODULE,\ + },\ + .conf = {\ + .reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \ + .sel_mask = (1 << 4),\ + .en_mask = 1,\ + },\ + .volt = {\ + .reg_a = DA9055_REG_VBCORE_A + DA9055_ID_##_id, \ + .reg_b = DA9055_REG_VBCORE_B + DA9055_ID_##_id, \ + .sl_shift = 7,\ + .v_mask = (1 << (vbits)) - 1,\ + .v_shift = (vbits),\ + },\ +} + +#define DA9055_BUCK(_id, step, min, max, vbits, voffset, mbits, sbits) \ +{\ + .reg_desc = {\ + .name = #_id,\ + .ops = &da9055_buck_ops,\ + .type = REGULATOR_VOLTAGE,\ + .id = DA9055_ID_##_id,\ + .n_voltages = (max - min) / step + 1 + (voffset), \ + .enable_reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \ + .enable_mask = 1,\ + .min_uV = (min) * 1000,\ + .uV_step = (step) * 1000,\ + .linear_min_sel = (voffset),\ + .owner = THIS_MODULE,\ + },\ + .conf = {\ + .reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \ + .sel_mask = (1 << 4),\ + .en_mask = 1,\ + },\ + .volt = {\ + .reg_a = DA9055_REG_VBCORE_A + DA9055_ID_##_id, \ + .reg_b = DA9055_REG_VBCORE_B + DA9055_ID_##_id, \ + .sl_shift = 7,\ + .v_mask = (1 << (vbits)) - 1,\ + .v_shift = (vbits),\ + },\ + .mode = {\ + .reg = DA9055_REG_BCORE_MODE,\ + .mask = (mbits),\ + .shift = (sbits),\ + },\ +} + +static struct da9055_regulator_info da9055_regulator_info[] = { + DA9055_BUCK(BUCK1, 25, 725, 2075, 6, 9, 0xc, 2), + DA9055_BUCK(BUCK2, 25, 925, 2500, 6, 0, 3, 0), + DA9055_LDO(LDO1, 50, 900, 3300, 6, 2), + DA9055_LDO(LDO2, 50, 900, 3300, 6, 3), + DA9055_LDO(LDO3, 50, 900, 3300, 6, 2), + DA9055_LDO(LDO4, 50, 900, 3300, 6, 2), + DA9055_LDO(LDO5, 50, 900, 2750, 6, 2), + DA9055_LDO(LDO6, 20, 900, 3300, 7, 0), +}; + +/* + * Configures regulator to be controlled either through GPIO 1 or 2. + * GPIO can control regulator state and/or select the regulator register + * set A/B for voltage ramping. + */ +static int da9055_gpio_init(struct da9055_regulator *regulator, + struct regulator_config *config, + struct da9055_pdata *pdata, int id) +{ + struct da9055_regulator_info *info = regulator->info; + int ret = 0; + + if (pdata->gpio_ren && pdata->gpio_ren[id]) { + char name[18]; + int gpio_mux = pdata->gpio_ren[id]; + + config->ena_gpio = pdata->ena_gpio[id]; + config->ena_gpio_flags = GPIOF_OUT_INIT_HIGH; + config->ena_gpio_invert = 1; + + /* + * GPI pin is muxed with regulator to control the + * regulator state. + */ + sprintf(name, "DA9055 GPI %d", gpio_mux); + ret = devm_gpio_request_one(config->dev, gpio_mux, GPIOF_DIR_IN, + name); + if (ret < 0) + goto err; + + /* + * Let the regulator know that its state is controlled + * through GPI. + */ + ret = da9055_reg_update(regulator->da9055, info->conf.reg, + DA9055_E_GPI_MASK, + pdata->reg_ren[id] + << DA9055_E_GPI_SHIFT); + if (ret < 0) + goto err; + } + + if (pdata->gpio_rsel && pdata->gpio_rsel[id]) { + char name[18]; + int gpio_mux = pdata->gpio_rsel[id]; + + regulator->reg_rselect = pdata->reg_rsel[id]; + + /* + * GPI pin is muxed with regulator to select the + * regulator register set A/B for voltage ramping. + */ + sprintf(name, "DA9055 GPI %d", gpio_mux); + ret = devm_gpio_request_one(config->dev, gpio_mux, GPIOF_DIR_IN, + name); + if (ret < 0) + goto err; + + /* + * Let the regulator know that its register set A/B + * will be selected through GPI for voltage ramping. + */ + ret = da9055_reg_update(regulator->da9055, info->conf.reg, + DA9055_V_GPI_MASK, + pdata->reg_rsel[id] + << DA9055_V_GPI_SHIFT); + } + +err: + return ret; +} + +static irqreturn_t da9055_ldo5_6_oc_irq(int irq, void *data) +{ + struct da9055_regulator *regulator = data; + + regulator_notifier_call_chain(regulator->rdev, + REGULATOR_EVENT_OVER_CURRENT, NULL); + + return IRQ_HANDLED; +} + +static inline struct da9055_regulator_info *find_regulator_info(int id) +{ + struct da9055_regulator_info *info; + int i; + + for (i = 0; i < ARRAY_SIZE(da9055_regulator_info); i++) { + info = &da9055_regulator_info[i]; + if (info->reg_desc.id == id) + return info; + } + + return NULL; +} + +static int da9055_regulator_probe(struct platform_device *pdev) +{ + struct regulator_config config = { }; + struct da9055_regulator *regulator; + struct da9055 *da9055 = dev_get_drvdata(pdev->dev.parent); + struct da9055_pdata *pdata = da9055->dev->platform_data; + int ret, irq; + + if (pdata == NULL || pdata->regulators[pdev->id] == NULL) + return -ENODEV; + + regulator = devm_kzalloc(&pdev->dev, sizeof(struct da9055_regulator), + GFP_KERNEL); + if (!regulator) + return -ENOMEM; + + regulator->info = find_regulator_info(pdev->id); + if (regulator->info == NULL) { + dev_err(&pdev->dev, "invalid regulator ID specified\n"); + return -EINVAL; + } + + regulator->da9055 = da9055; + config.dev = &pdev->dev; + config.driver_data = regulator; + config.regmap = da9055->regmap; + + if (pdata && pdata->regulators) + config.init_data = pdata->regulators[pdev->id]; + + ret = da9055_gpio_init(regulator, &config, pdata, pdev->id); + if (ret < 0) + return ret; + + regulator->rdev = regulator_register(®ulator->info->reg_desc, + &config); + if (IS_ERR(regulator->rdev)) { + dev_err(&pdev->dev, "Failed to register regulator %s\n", + regulator->info->reg_desc.name); + ret = PTR_ERR(regulator->rdev); + return ret; + } + + /* Only LDO 5 and 6 has got the over current interrupt */ + if (pdev->id == DA9055_ID_LDO5 || pdev->id == DA9055_ID_LDO6) { + irq = platform_get_irq_byname(pdev, "REGULATOR"); + irq = regmap_irq_get_virq(da9055->irq_data, irq); + ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, + da9055_ldo5_6_oc_irq, + IRQF_TRIGGER_HIGH | + IRQF_ONESHOT | + IRQF_PROBE_SHARED, + pdev->name, regulator); + if (ret != 0) { + if (ret != -EBUSY) { + dev_err(&pdev->dev, + "Failed to request Regulator IRQ %d: %d\n", + irq, ret); + goto err_regulator; + } + } + } + + platform_set_drvdata(pdev, regulator); + + return 0; + +err_regulator: + regulator_unregister(regulator->rdev); + return ret; +} + +static int da9055_regulator_remove(struct platform_device *pdev) +{ + struct da9055_regulator *regulator = platform_get_drvdata(pdev); + + regulator_unregister(regulator->rdev); + + return 0; +} + +static struct platform_driver da9055_regulator_driver = { + .probe = da9055_regulator_probe, + .remove = da9055_regulator_remove, + .driver = { + .name = "da9055-regulator", + .owner = THIS_MODULE, + }, +}; + +static int __init da9055_regulator_init(void) +{ + return platform_driver_register(&da9055_regulator_driver); +} +subsys_initcall(da9055_regulator_init); + +static void __exit da9055_regulator_exit(void) +{ + platform_driver_unregister(&da9055_regulator_driver); +} +module_exit(da9055_regulator_exit); + +MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); +MODULE_DESCRIPTION("Power Regulator driver for Dialog DA9055 PMIC"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:da9055-regulator"); |