| /* |
| * Regulator driver for tps65090 power management chip. |
| * |
| * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved. |
| |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms and conditions of the GNU General Public License, |
| * version 2, as published by the Free Software Foundation. |
| |
| * This program is distributed in the hope 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. |
| |
| * You should have received a copy of the GNU General Public License |
| * along with this program. If not, see <http://www.gnu.org/licenses/> |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/delay.h> |
| #include <linux/init.h> |
| #include <linux/of.h> |
| #include <linux/gpio/consumer.h> |
| #include <linux/slab.h> |
| #include <linux/err.h> |
| #include <linux/platform_device.h> |
| #include <linux/regulator/driver.h> |
| #include <linux/regulator/machine.h> |
| #include <linux/regulator/of_regulator.h> |
| #include <linux/mfd/tps65090.h> |
| |
| #define MAX_CTRL_READ_TRIES 5 |
| #define MAX_FET_ENABLE_TRIES 1000 |
| |
| #define CTRL_EN_BIT 0 /* Regulator enable bit, active high */ |
| #define CTRL_WT_BIT 2 /* Regulator wait time 0 bit */ |
| #define CTRL_PG_BIT 4 /* Regulator power good bit, 1=good */ |
| #define CTRL_TO_BIT 7 /* Regulator timeout bit, 1=wait */ |
| |
| #define MAX_OVERCURRENT_WAIT 3 /* Overcurrent wait must be <= this */ |
| |
| /** |
| * struct tps65090_regulator - Per-regulator data for a tps65090 regulator |
| * |
| * @dev: Pointer to our device. |
| * @desc: The struct regulator_desc for the regulator. |
| * @rdev: The struct regulator_dev for the regulator. |
| * @overcurrent_wait_valid: True if overcurrent_wait is valid. |
| * @overcurrent_wait: For FETs, the value to put in the WTFET bitfield. |
| */ |
| |
| struct tps65090_regulator { |
| struct device *dev; |
| struct regulator_desc *desc; |
| struct regulator_dev *rdev; |
| bool overcurrent_wait_valid; |
| int overcurrent_wait; |
| }; |
| |
| static struct regulator_ops tps65090_ext_control_ops = { |
| }; |
| |
| /** |
| * tps65090_reg_set_overcurrent_wait - Setup overcurrent wait |
| * |
| * This will set the overcurrent wait time based on what's in the regulator |
| * info. |
| * |
| * @ri: Overall regulator data |
| * @rdev: Regulator device |
| * |
| * Return: 0 if no error, non-zero if there was an error writing the register. |
| */ |
| static int tps65090_reg_set_overcurrent_wait(struct tps65090_regulator *ri, |
| struct regulator_dev *rdev) |
| { |
| int ret; |
| |
| ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, |
| MAX_OVERCURRENT_WAIT << CTRL_WT_BIT, |
| ri->overcurrent_wait << CTRL_WT_BIT); |
| if (ret) { |
| dev_err(&rdev->dev, "Error updating overcurrent wait %#x\n", |
| rdev->desc->enable_reg); |
| } |
| |
| return ret; |
| } |
| |
| /** |
| * tps65090_try_enable_fet - Try to enable a FET |
| * |
| * @rdev: Regulator device |
| * |
| * Return: 0 if ok, -ENOTRECOVERABLE if the FET power good bit did not get |
| * set, or some other -ve value if another error occurred (e.g. i2c error) |
| */ |
| static int tps65090_try_enable_fet(struct regulator_dev *rdev) |
| { |
| unsigned int control; |
| int ret, i; |
| |
| ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, |
| rdev->desc->enable_mask, |
| rdev->desc->enable_mask); |
| if (ret < 0) { |
| dev_err(&rdev->dev, "Error in updating reg %#x\n", |
| rdev->desc->enable_reg); |
| return ret; |
| } |
| |
| for (i = 0; i < MAX_CTRL_READ_TRIES; i++) { |
| ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, |
| &control); |
| if (ret < 0) |
| return ret; |
| |
| if (!(control & BIT(CTRL_TO_BIT))) |
| break; |
| |
| usleep_range(1000, 1500); |
| } |
| if (!(control & BIT(CTRL_PG_BIT))) |
| return -ENOTRECOVERABLE; |
| |
| return 0; |
| } |
| |
| /** |
| * tps65090_fet_enable - Enable a FET, trying a few times if it fails |
| * |
| * Some versions of the tps65090 have issues when turning on the FETs. |
| * This function goes through several steps to ensure the best chance of the |
| * FET going on. Specifically: |
| * - We'll make sure that we bump the "overcurrent wait" to the maximum, which |
| * increases the chances that we'll turn on properly. |
| * - We'll retry turning the FET on multiple times (turning off in between). |
| * |
| * @rdev: Regulator device |
| * |
| * Return: 0 if ok, non-zero if it fails. |
| */ |
| static int tps65090_fet_enable(struct regulator_dev *rdev) |
| { |
| int ret, tries; |
| |
| /* |
| * Try enabling multiple times until we succeed since sometimes the |
| * first try times out. |
| */ |
| tries = 0; |
| while (true) { |
| ret = tps65090_try_enable_fet(rdev); |
| if (!ret) |
| break; |
| if (ret != -ENOTRECOVERABLE || tries == MAX_FET_ENABLE_TRIES) |
| goto err; |
| |
| /* Try turning the FET off (and then on again) */ |
| ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, |
| rdev->desc->enable_mask, 0); |
| if (ret) |
| goto err; |
| |
| tries++; |
| } |
| |
| if (tries) |
| dev_warn(&rdev->dev, "reg %#x enable ok after %d tries\n", |
| rdev->desc->enable_reg, tries); |
| |
| return 0; |
| err: |
| dev_warn(&rdev->dev, "reg %#x enable failed\n", rdev->desc->enable_reg); |
| WARN_ON(1); |
| |
| return ret; |
| } |
| |
| static struct regulator_ops tps65090_reg_control_ops = { |
| .enable = regulator_enable_regmap, |
| .disable = regulator_disable_regmap, |
| .is_enabled = regulator_is_enabled_regmap, |
| }; |
| |
| static struct regulator_ops tps65090_fet_control_ops = { |
| .enable = tps65090_fet_enable, |
| .disable = regulator_disable_regmap, |
| .is_enabled = regulator_is_enabled_regmap, |
| }; |
| |
| static struct regulator_ops tps65090_ldo_ops = { |
| }; |
| |
| #define tps65090_REG_DESC(_id, _sname, _en_reg, _en_bits, _nvolt, _volt, _ops) \ |
| { \ |
| .name = "TPS65090_RAILS"#_id, \ |
| .supply_name = _sname, \ |
| .id = TPS65090_REGULATOR_##_id, \ |
| .n_voltages = _nvolt, \ |
| .ops = &_ops, \ |
| .fixed_uV = _volt, \ |
| .enable_reg = _en_reg, \ |
| .enable_val = _en_bits, \ |
| .enable_mask = _en_bits, \ |
| .type = REGULATOR_VOLTAGE, \ |
| .owner = THIS_MODULE, \ |
| } |
| |
| #define tps65090_REG_FIXEDV(_id, _sname, en_reg, _en_bits, _volt, _ops) \ |
| tps65090_REG_DESC(_id, _sname, en_reg, _en_bits, 1, _volt, _ops) |
| |
| #define tps65090_REG_SWITCH(_id, _sname, en_reg, _en_bits, _ops) \ |
| tps65090_REG_DESC(_id, _sname, en_reg, _en_bits, 0, 0, _ops) |
| |
| static struct regulator_desc tps65090_regulator_desc[] = { |
| tps65090_REG_FIXEDV(DCDC1, "vsys1", 0x0C, BIT(CTRL_EN_BIT), 5000000, |
| tps65090_reg_control_ops), |
| tps65090_REG_FIXEDV(DCDC2, "vsys2", 0x0D, BIT(CTRL_EN_BIT), 3300000, |
| tps65090_reg_control_ops), |
| tps65090_REG_SWITCH(DCDC3, "vsys3", 0x0E, BIT(CTRL_EN_BIT), |
| tps65090_reg_control_ops), |
| |
| tps65090_REG_SWITCH(FET1, "infet1", 0x0F, |
| BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT), |
| tps65090_fet_control_ops), |
| tps65090_REG_SWITCH(FET2, "infet2", 0x10, |
| BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT), |
| tps65090_fet_control_ops), |
| tps65090_REG_SWITCH(FET3, "infet3", 0x11, |
| BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT), |
| tps65090_fet_control_ops), |
| tps65090_REG_SWITCH(FET4, "infet4", 0x12, |
| BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT), |
| tps65090_fet_control_ops), |
| tps65090_REG_SWITCH(FET5, "infet5", 0x13, |
| BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT), |
| tps65090_fet_control_ops), |
| tps65090_REG_SWITCH(FET6, "infet6", 0x14, |
| BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT), |
| tps65090_fet_control_ops), |
| tps65090_REG_SWITCH(FET7, "infet7", 0x15, |
| BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT), |
| tps65090_fet_control_ops), |
| |
| tps65090_REG_FIXEDV(LDO1, "vsys-l1", 0, 0, 5000000, |
| tps65090_ldo_ops), |
| tps65090_REG_FIXEDV(LDO2, "vsys-l2", 0, 0, 3300000, |
| tps65090_ldo_ops), |
| }; |
| |
| static inline bool is_dcdc(int id) |
| { |
| switch (id) { |
| case TPS65090_REGULATOR_DCDC1: |
| case TPS65090_REGULATOR_DCDC2: |
| case TPS65090_REGULATOR_DCDC3: |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| static int tps65090_config_ext_control( |
| struct tps65090_regulator *ri, bool enable) |
| { |
| int ret; |
| struct device *parent = ri->dev->parent; |
| unsigned int reg_en_reg = ri->desc->enable_reg; |
| |
| if (enable) |
| ret = tps65090_set_bits(parent, reg_en_reg, 1); |
| else |
| ret = tps65090_clr_bits(parent, reg_en_reg, 1); |
| if (ret < 0) |
| dev_err(ri->dev, "Error in updating reg 0x%x\n", reg_en_reg); |
| return ret; |
| } |
| |
| static int tps65090_regulator_disable_ext_control( |
| struct tps65090_regulator *ri, |
| struct tps65090_regulator_plat_data *tps_pdata) |
| { |
| int ret = 0; |
| struct device *parent = ri->dev->parent; |
| unsigned int reg_en_reg = ri->desc->enable_reg; |
| |
| /* |
| * First enable output for internal control if require. |
| * And then disable external control. |
| */ |
| if (tps_pdata->reg_init_data->constraints.always_on || |
| tps_pdata->reg_init_data->constraints.boot_on) { |
| ret = tps65090_set_bits(parent, reg_en_reg, 0); |
| if (ret < 0) { |
| dev_err(ri->dev, "Error in set reg 0x%x\n", reg_en_reg); |
| return ret; |
| } |
| } |
| return tps65090_config_ext_control(ri, false); |
| } |
| |
| #ifdef CONFIG_OF |
| static struct of_regulator_match tps65090_matches[] = { |
| { .name = "dcdc1", }, |
| { .name = "dcdc2", }, |
| { .name = "dcdc3", }, |
| { .name = "fet1", }, |
| { .name = "fet2", }, |
| { .name = "fet3", }, |
| { .name = "fet4", }, |
| { .name = "fet5", }, |
| { .name = "fet6", }, |
| { .name = "fet7", }, |
| { .name = "ldo1", }, |
| { .name = "ldo2", }, |
| }; |
| |
| static struct tps65090_platform_data *tps65090_parse_dt_reg_data( |
| struct platform_device *pdev, |
| struct of_regulator_match **tps65090_reg_matches) |
| { |
| struct tps65090_platform_data *tps65090_pdata; |
| struct device_node *np = pdev->dev.parent->of_node; |
| struct device_node *regulators; |
| int idx = 0, ret; |
| struct tps65090_regulator_plat_data *reg_pdata; |
| |
| tps65090_pdata = devm_kzalloc(&pdev->dev, sizeof(*tps65090_pdata), |
| GFP_KERNEL); |
| if (!tps65090_pdata) |
| return ERR_PTR(-ENOMEM); |
| |
| reg_pdata = devm_kcalloc(&pdev->dev, |
| TPS65090_REGULATOR_MAX, sizeof(*reg_pdata), |
| GFP_KERNEL); |
| if (!reg_pdata) |
| return ERR_PTR(-ENOMEM); |
| |
| regulators = of_get_child_by_name(np, "regulators"); |
| if (!regulators) { |
| dev_err(&pdev->dev, "regulator node not found\n"); |
| return ERR_PTR(-ENODEV); |
| } |
| |
| ret = of_regulator_match(&pdev->dev, regulators, tps65090_matches, |
| ARRAY_SIZE(tps65090_matches)); |
| of_node_put(regulators); |
| if (ret < 0) { |
| dev_err(&pdev->dev, |
| "Error parsing regulator init data: %d\n", ret); |
| return ERR_PTR(ret); |
| } |
| |
| *tps65090_reg_matches = tps65090_matches; |
| for (idx = 0; idx < ARRAY_SIZE(tps65090_matches); idx++) { |
| struct regulator_init_data *ri_data; |
| struct tps65090_regulator_plat_data *rpdata; |
| |
| rpdata = ®_pdata[idx]; |
| ri_data = tps65090_matches[idx].init_data; |
| if (!ri_data || !tps65090_matches[idx].of_node) |
| continue; |
| |
| rpdata->reg_init_data = ri_data; |
| rpdata->enable_ext_control = of_property_read_bool( |
| tps65090_matches[idx].of_node, |
| "ti,enable-ext-control"); |
| if (rpdata->enable_ext_control) { |
| enum gpiod_flags gflags; |
| |
| if (ri_data->constraints.always_on || |
| ri_data->constraints.boot_on) |
| gflags = GPIOD_OUT_HIGH; |
| else |
| gflags = GPIOD_OUT_LOW; |
| gflags |= GPIOD_FLAGS_BIT_NONEXCLUSIVE; |
| |
| rpdata->gpiod = devm_gpiod_get_from_of_node(&pdev->dev, |
| tps65090_matches[idx].of_node, |
| "dcdc-ext-control-gpios", 0, |
| gflags, |
| "tps65090"); |
| if (IS_ERR(rpdata->gpiod)) |
| return ERR_CAST(rpdata->gpiod); |
| if (!rpdata->gpiod) |
| dev_err(&pdev->dev, |
| "could not find DCDC external control GPIO\n"); |
| } |
| |
| if (of_property_read_u32(tps65090_matches[idx].of_node, |
| "ti,overcurrent-wait", |
| &rpdata->overcurrent_wait) == 0) |
| rpdata->overcurrent_wait_valid = true; |
| |
| tps65090_pdata->reg_pdata[idx] = rpdata; |
| } |
| return tps65090_pdata; |
| } |
| #else |
| static inline struct tps65090_platform_data *tps65090_parse_dt_reg_data( |
| struct platform_device *pdev, |
| struct of_regulator_match **tps65090_reg_matches) |
| { |
| *tps65090_reg_matches = NULL; |
| return NULL; |
| } |
| #endif |
| |
| static int tps65090_regulator_probe(struct platform_device *pdev) |
| { |
| struct tps65090 *tps65090_mfd = dev_get_drvdata(pdev->dev.parent); |
| struct tps65090_regulator *ri = NULL; |
| struct regulator_config config = { }; |
| struct regulator_dev *rdev; |
| struct tps65090_regulator_plat_data *tps_pdata; |
| struct tps65090_regulator *pmic; |
| struct tps65090_platform_data *tps65090_pdata; |
| struct of_regulator_match *tps65090_reg_matches = NULL; |
| int num; |
| int ret; |
| |
| dev_dbg(&pdev->dev, "Probing regulator\n"); |
| |
| tps65090_pdata = dev_get_platdata(pdev->dev.parent); |
| if (!tps65090_pdata && tps65090_mfd->dev->of_node) |
| tps65090_pdata = tps65090_parse_dt_reg_data(pdev, |
| &tps65090_reg_matches); |
| if (IS_ERR_OR_NULL(tps65090_pdata)) { |
| dev_err(&pdev->dev, "Platform data missing\n"); |
| return tps65090_pdata ? PTR_ERR(tps65090_pdata) : -EINVAL; |
| } |
| |
| pmic = devm_kcalloc(&pdev->dev, |
| TPS65090_REGULATOR_MAX, sizeof(*pmic), |
| GFP_KERNEL); |
| if (!pmic) |
| return -ENOMEM; |
| |
| for (num = 0; num < TPS65090_REGULATOR_MAX; num++) { |
| tps_pdata = tps65090_pdata->reg_pdata[num]; |
| |
| ri = &pmic[num]; |
| ri->dev = &pdev->dev; |
| ri->desc = &tps65090_regulator_desc[num]; |
| if (tps_pdata) { |
| ri->overcurrent_wait_valid = |
| tps_pdata->overcurrent_wait_valid; |
| ri->overcurrent_wait = tps_pdata->overcurrent_wait; |
| } |
| |
| /* |
| * TPS5090 DCDC support the control from external digital input. |
| * Configure it as per platform data. |
| */ |
| if (tps_pdata && is_dcdc(num) && tps_pdata->reg_init_data) { |
| if (tps_pdata->enable_ext_control) { |
| config.ena_gpiod = tps_pdata->gpiod; |
| ri->desc->ops = &tps65090_ext_control_ops; |
| } else { |
| ret = tps65090_regulator_disable_ext_control( |
| ri, tps_pdata); |
| if (ret < 0) { |
| dev_err(&pdev->dev, |
| "failed disable ext control\n"); |
| return ret; |
| } |
| } |
| } |
| |
| config.dev = pdev->dev.parent; |
| config.driver_data = ri; |
| config.regmap = tps65090_mfd->rmap; |
| if (tps_pdata) |
| config.init_data = tps_pdata->reg_init_data; |
| else |
| config.init_data = NULL; |
| if (tps65090_reg_matches) |
| config.of_node = tps65090_reg_matches[num].of_node; |
| else |
| config.of_node = NULL; |
| |
| rdev = devm_regulator_register(&pdev->dev, ri->desc, &config); |
| if (IS_ERR(rdev)) { |
| dev_err(&pdev->dev, "failed to register regulator %s\n", |
| ri->desc->name); |
| return PTR_ERR(rdev); |
| } |
| ri->rdev = rdev; |
| |
| if (ri->overcurrent_wait_valid) { |
| ret = tps65090_reg_set_overcurrent_wait(ri, rdev); |
| if (ret < 0) |
| return ret; |
| } |
| |
| /* Enable external control if it is require */ |
| if (tps_pdata && is_dcdc(num) && tps_pdata->reg_init_data && |
| tps_pdata->enable_ext_control) { |
| ret = tps65090_config_ext_control(ri, true); |
| if (ret < 0) |
| return ret; |
| } |
| } |
| |
| platform_set_drvdata(pdev, pmic); |
| return 0; |
| } |
| |
| static struct platform_driver tps65090_regulator_driver = { |
| .driver = { |
| .name = "tps65090-pmic", |
| }, |
| .probe = tps65090_regulator_probe, |
| }; |
| |
| static int __init tps65090_regulator_init(void) |
| { |
| return platform_driver_register(&tps65090_regulator_driver); |
| } |
| subsys_initcall(tps65090_regulator_init); |
| |
| static void __exit tps65090_regulator_exit(void) |
| { |
| platform_driver_unregister(&tps65090_regulator_driver); |
| } |
| module_exit(tps65090_regulator_exit); |
| |
| MODULE_DESCRIPTION("tps65090 regulator driver"); |
| MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>"); |
| MODULE_LICENSE("GPL v2"); |
| MODULE_ALIAS("platform:tps65090-pmic"); |