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533 lines
14 KiB
533 lines
14 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Regulator driver for tps65090 power management chip. |
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* |
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* Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved. |
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*/ |
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#include <linux/module.h> |
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#include <linux/delay.h> |
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#include <linux/init.h> |
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#include <linux/of.h> |
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#include <linux/gpio/consumer.h> |
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#include <linux/slab.h> |
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#include <linux/err.h> |
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#include <linux/platform_device.h> |
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#include <linux/regulator/driver.h> |
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#include <linux/regulator/machine.h> |
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#include <linux/regulator/of_regulator.h> |
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#include <linux/mfd/tps65090.h> |
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#define MAX_CTRL_READ_TRIES 5 |
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#define MAX_FET_ENABLE_TRIES 1000 |
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#define CTRL_EN_BIT 0 /* Regulator enable bit, active high */ |
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#define CTRL_WT_BIT 2 /* Regulator wait time 0 bit */ |
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#define CTRL_PG_BIT 4 /* Regulator power good bit, 1=good */ |
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#define CTRL_TO_BIT 7 /* Regulator timeout bit, 1=wait */ |
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#define MAX_OVERCURRENT_WAIT 3 /* Overcurrent wait must be <= this */ |
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/** |
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* struct tps65090_regulator - Per-regulator data for a tps65090 regulator |
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* |
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* @dev: Pointer to our device. |
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* @desc: The struct regulator_desc for the regulator. |
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* @rdev: The struct regulator_dev for the regulator. |
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* @overcurrent_wait_valid: True if overcurrent_wait is valid. |
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* @overcurrent_wait: For FETs, the value to put in the WTFET bitfield. |
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*/ |
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struct tps65090_regulator { |
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struct device *dev; |
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struct regulator_desc *desc; |
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struct regulator_dev *rdev; |
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bool overcurrent_wait_valid; |
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int overcurrent_wait; |
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}; |
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static const struct regulator_ops tps65090_ext_control_ops = { |
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}; |
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/** |
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* tps65090_reg_set_overcurrent_wait - Setup overcurrent wait |
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* |
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* This will set the overcurrent wait time based on what's in the regulator |
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* info. |
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* |
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* @ri: Overall regulator data |
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* @rdev: Regulator device |
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* |
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* Return: 0 if no error, non-zero if there was an error writing the register. |
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*/ |
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static int tps65090_reg_set_overcurrent_wait(struct tps65090_regulator *ri, |
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struct regulator_dev *rdev) |
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{ |
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int ret; |
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ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, |
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MAX_OVERCURRENT_WAIT << CTRL_WT_BIT, |
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ri->overcurrent_wait << CTRL_WT_BIT); |
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if (ret) { |
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dev_err(&rdev->dev, "Error updating overcurrent wait %#x\n", |
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rdev->desc->enable_reg); |
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} |
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return ret; |
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} |
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/** |
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* tps65090_try_enable_fet - Try to enable a FET |
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* |
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* @rdev: Regulator device |
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* |
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* Return: 0 if ok, -ENOTRECOVERABLE if the FET power good bit did not get |
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* set, or some other -ve value if another error occurred (e.g. i2c error) |
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*/ |
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static int tps65090_try_enable_fet(struct regulator_dev *rdev) |
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{ |
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unsigned int control; |
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int ret, i; |
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ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, |
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rdev->desc->enable_mask, |
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rdev->desc->enable_mask); |
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if (ret < 0) { |
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dev_err(&rdev->dev, "Error in updating reg %#x\n", |
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rdev->desc->enable_reg); |
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return ret; |
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} |
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for (i = 0; i < MAX_CTRL_READ_TRIES; i++) { |
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ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, |
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&control); |
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if (ret < 0) |
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return ret; |
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if (!(control & BIT(CTRL_TO_BIT))) |
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break; |
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usleep_range(1000, 1500); |
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} |
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if (!(control & BIT(CTRL_PG_BIT))) |
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return -ENOTRECOVERABLE; |
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return 0; |
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} |
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/** |
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* tps65090_fet_enable - Enable a FET, trying a few times if it fails |
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* |
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* Some versions of the tps65090 have issues when turning on the FETs. |
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* This function goes through several steps to ensure the best chance of the |
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* FET going on. Specifically: |
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* - We'll make sure that we bump the "overcurrent wait" to the maximum, which |
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* increases the chances that we'll turn on properly. |
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* - We'll retry turning the FET on multiple times (turning off in between). |
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* |
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* @rdev: Regulator device |
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* |
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* Return: 0 if ok, non-zero if it fails. |
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*/ |
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static int tps65090_fet_enable(struct regulator_dev *rdev) |
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{ |
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int ret, tries; |
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/* |
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* Try enabling multiple times until we succeed since sometimes the |
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* first try times out. |
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*/ |
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tries = 0; |
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while (true) { |
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ret = tps65090_try_enable_fet(rdev); |
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if (!ret) |
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break; |
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if (ret != -ENOTRECOVERABLE || tries == MAX_FET_ENABLE_TRIES) |
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goto err; |
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/* Try turning the FET off (and then on again) */ |
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ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, |
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rdev->desc->enable_mask, 0); |
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if (ret) |
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goto err; |
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tries++; |
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} |
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if (tries) |
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dev_warn(&rdev->dev, "reg %#x enable ok after %d tries\n", |
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rdev->desc->enable_reg, tries); |
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return 0; |
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err: |
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dev_warn(&rdev->dev, "reg %#x enable failed\n", rdev->desc->enable_reg); |
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WARN_ON(1); |
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return ret; |
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} |
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static const struct regulator_ops tps65090_reg_control_ops = { |
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.enable = regulator_enable_regmap, |
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.disable = regulator_disable_regmap, |
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.is_enabled = regulator_is_enabled_regmap, |
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}; |
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static const struct regulator_ops tps65090_fet_control_ops = { |
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.enable = tps65090_fet_enable, |
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.disable = regulator_disable_regmap, |
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.is_enabled = regulator_is_enabled_regmap, |
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}; |
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static const struct regulator_ops tps65090_ldo_ops = { |
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}; |
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#define tps65090_REG_DESC(_id, _sname, _en_reg, _en_bits, _nvolt, _volt, _ops) \ |
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{ \ |
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.name = "TPS65090_RAILS"#_id, \ |
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.supply_name = _sname, \ |
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.id = TPS65090_REGULATOR_##_id, \ |
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.n_voltages = _nvolt, \ |
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.ops = &_ops, \ |
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.fixed_uV = _volt, \ |
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.enable_reg = _en_reg, \ |
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.enable_val = _en_bits, \ |
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.enable_mask = _en_bits, \ |
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.type = REGULATOR_VOLTAGE, \ |
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.owner = THIS_MODULE, \ |
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} |
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#define tps65090_REG_FIXEDV(_id, _sname, en_reg, _en_bits, _volt, _ops) \ |
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tps65090_REG_DESC(_id, _sname, en_reg, _en_bits, 1, _volt, _ops) |
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#define tps65090_REG_SWITCH(_id, _sname, en_reg, _en_bits, _ops) \ |
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tps65090_REG_DESC(_id, _sname, en_reg, _en_bits, 0, 0, _ops) |
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static struct regulator_desc tps65090_regulator_desc[] = { |
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tps65090_REG_FIXEDV(DCDC1, "vsys1", 0x0C, BIT(CTRL_EN_BIT), 5000000, |
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tps65090_reg_control_ops), |
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tps65090_REG_FIXEDV(DCDC2, "vsys2", 0x0D, BIT(CTRL_EN_BIT), 3300000, |
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tps65090_reg_control_ops), |
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tps65090_REG_SWITCH(DCDC3, "vsys3", 0x0E, BIT(CTRL_EN_BIT), |
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tps65090_reg_control_ops), |
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tps65090_REG_SWITCH(FET1, "infet1", 0x0F, |
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BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT), |
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tps65090_fet_control_ops), |
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tps65090_REG_SWITCH(FET2, "infet2", 0x10, |
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BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT), |
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tps65090_fet_control_ops), |
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tps65090_REG_SWITCH(FET3, "infet3", 0x11, |
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BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT), |
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tps65090_fet_control_ops), |
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tps65090_REG_SWITCH(FET4, "infet4", 0x12, |
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BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT), |
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tps65090_fet_control_ops), |
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tps65090_REG_SWITCH(FET5, "infet5", 0x13, |
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BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT), |
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tps65090_fet_control_ops), |
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tps65090_REG_SWITCH(FET6, "infet6", 0x14, |
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BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT), |
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tps65090_fet_control_ops), |
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tps65090_REG_SWITCH(FET7, "infet7", 0x15, |
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BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT), |
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tps65090_fet_control_ops), |
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tps65090_REG_FIXEDV(LDO1, "vsys-l1", 0, 0, 5000000, |
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tps65090_ldo_ops), |
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tps65090_REG_FIXEDV(LDO2, "vsys-l2", 0, 0, 3300000, |
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tps65090_ldo_ops), |
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}; |
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static inline bool is_dcdc(int id) |
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{ |
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switch (id) { |
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case TPS65090_REGULATOR_DCDC1: |
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case TPS65090_REGULATOR_DCDC2: |
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case TPS65090_REGULATOR_DCDC3: |
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return true; |
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default: |
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return false; |
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} |
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} |
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static int tps65090_config_ext_control( |
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struct tps65090_regulator *ri, bool enable) |
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{ |
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int ret; |
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struct device *parent = ri->dev->parent; |
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unsigned int reg_en_reg = ri->desc->enable_reg; |
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if (enable) |
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ret = tps65090_set_bits(parent, reg_en_reg, 1); |
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else |
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ret = tps65090_clr_bits(parent, reg_en_reg, 1); |
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if (ret < 0) |
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dev_err(ri->dev, "Error in updating reg 0x%x\n", reg_en_reg); |
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return ret; |
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} |
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static int tps65090_regulator_disable_ext_control( |
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struct tps65090_regulator *ri, |
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struct tps65090_regulator_plat_data *tps_pdata) |
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{ |
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int ret = 0; |
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struct device *parent = ri->dev->parent; |
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unsigned int reg_en_reg = ri->desc->enable_reg; |
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/* |
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* First enable output for internal control if require. |
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* And then disable external control. |
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*/ |
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if (tps_pdata->reg_init_data->constraints.always_on || |
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tps_pdata->reg_init_data->constraints.boot_on) { |
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ret = tps65090_set_bits(parent, reg_en_reg, 0); |
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if (ret < 0) { |
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dev_err(ri->dev, "Error in set reg 0x%x\n", reg_en_reg); |
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return ret; |
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} |
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} |
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return tps65090_config_ext_control(ri, false); |
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} |
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#ifdef CONFIG_OF |
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static struct of_regulator_match tps65090_matches[] = { |
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{ .name = "dcdc1", }, |
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{ .name = "dcdc2", }, |
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{ .name = "dcdc3", }, |
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{ .name = "fet1", }, |
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{ .name = "fet2", }, |
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{ .name = "fet3", }, |
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{ .name = "fet4", }, |
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{ .name = "fet5", }, |
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{ .name = "fet6", }, |
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{ .name = "fet7", }, |
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{ .name = "ldo1", }, |
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{ .name = "ldo2", }, |
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}; |
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static struct tps65090_platform_data *tps65090_parse_dt_reg_data( |
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struct platform_device *pdev, |
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struct of_regulator_match **tps65090_reg_matches) |
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{ |
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struct tps65090_platform_data *tps65090_pdata; |
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struct device_node *np = pdev->dev.parent->of_node; |
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struct device_node *regulators; |
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int idx = 0, ret; |
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struct tps65090_regulator_plat_data *reg_pdata; |
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tps65090_pdata = devm_kzalloc(&pdev->dev, sizeof(*tps65090_pdata), |
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GFP_KERNEL); |
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if (!tps65090_pdata) |
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return ERR_PTR(-ENOMEM); |
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reg_pdata = devm_kcalloc(&pdev->dev, |
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TPS65090_REGULATOR_MAX, sizeof(*reg_pdata), |
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GFP_KERNEL); |
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if (!reg_pdata) |
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return ERR_PTR(-ENOMEM); |
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regulators = of_get_child_by_name(np, "regulators"); |
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if (!regulators) { |
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dev_err(&pdev->dev, "regulator node not found\n"); |
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return ERR_PTR(-ENODEV); |
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} |
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ret = of_regulator_match(&pdev->dev, regulators, tps65090_matches, |
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ARRAY_SIZE(tps65090_matches)); |
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of_node_put(regulators); |
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if (ret < 0) { |
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dev_err(&pdev->dev, |
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"Error parsing regulator init data: %d\n", ret); |
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return ERR_PTR(ret); |
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} |
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*tps65090_reg_matches = tps65090_matches; |
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for (idx = 0; idx < ARRAY_SIZE(tps65090_matches); idx++) { |
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struct regulator_init_data *ri_data; |
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struct tps65090_regulator_plat_data *rpdata; |
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struct device_node *np; |
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rpdata = ®_pdata[idx]; |
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ri_data = tps65090_matches[idx].init_data; |
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if (!ri_data) |
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continue; |
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np = tps65090_matches[idx].of_node; |
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if (!np) |
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continue; |
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rpdata->reg_init_data = ri_data; |
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rpdata->enable_ext_control = of_property_read_bool(np, |
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"ti,enable-ext-control"); |
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if (rpdata->enable_ext_control) { |
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enum gpiod_flags gflags; |
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if (ri_data->constraints.always_on || |
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ri_data->constraints.boot_on) |
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gflags = GPIOD_OUT_HIGH; |
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else |
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gflags = GPIOD_OUT_LOW; |
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gflags |= GPIOD_FLAGS_BIT_NONEXCLUSIVE; |
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rpdata->gpiod = devm_fwnode_gpiod_get( |
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&pdev->dev, |
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of_fwnode_handle(np), |
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"dcdc-ext-control", |
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gflags, |
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"tps65090"); |
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if (PTR_ERR(rpdata->gpiod) == -ENOENT) { |
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dev_err(&pdev->dev, |
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"could not find DCDC external control GPIO\n"); |
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rpdata->gpiod = NULL; |
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} else if (IS_ERR(rpdata->gpiod)) |
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return ERR_CAST(rpdata->gpiod); |
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} |
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if (of_property_read_u32(np, "ti,overcurrent-wait", |
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&rpdata->overcurrent_wait) == 0) |
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rpdata->overcurrent_wait_valid = true; |
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tps65090_pdata->reg_pdata[idx] = rpdata; |
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} |
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return tps65090_pdata; |
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} |
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#else |
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static inline struct tps65090_platform_data *tps65090_parse_dt_reg_data( |
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struct platform_device *pdev, |
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struct of_regulator_match **tps65090_reg_matches) |
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{ |
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*tps65090_reg_matches = NULL; |
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return NULL; |
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} |
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#endif |
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static int tps65090_regulator_probe(struct platform_device *pdev) |
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{ |
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struct tps65090 *tps65090_mfd = dev_get_drvdata(pdev->dev.parent); |
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struct tps65090_regulator *ri = NULL; |
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struct regulator_config config = { }; |
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struct regulator_dev *rdev; |
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struct tps65090_regulator_plat_data *tps_pdata; |
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struct tps65090_regulator *pmic; |
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struct tps65090_platform_data *tps65090_pdata; |
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struct of_regulator_match *tps65090_reg_matches = NULL; |
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int num; |
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int ret; |
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dev_dbg(&pdev->dev, "Probing regulator\n"); |
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tps65090_pdata = dev_get_platdata(pdev->dev.parent); |
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if (!tps65090_pdata && tps65090_mfd->dev->of_node) |
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tps65090_pdata = tps65090_parse_dt_reg_data(pdev, |
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&tps65090_reg_matches); |
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if (IS_ERR_OR_NULL(tps65090_pdata)) { |
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dev_err(&pdev->dev, "Platform data missing\n"); |
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return tps65090_pdata ? PTR_ERR(tps65090_pdata) : -EINVAL; |
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} |
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pmic = devm_kcalloc(&pdev->dev, |
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TPS65090_REGULATOR_MAX, sizeof(*pmic), |
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GFP_KERNEL); |
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if (!pmic) |
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return -ENOMEM; |
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for (num = 0; num < TPS65090_REGULATOR_MAX; num++) { |
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tps_pdata = tps65090_pdata->reg_pdata[num]; |
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ri = &pmic[num]; |
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ri->dev = &pdev->dev; |
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ri->desc = &tps65090_regulator_desc[num]; |
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if (tps_pdata) { |
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ri->overcurrent_wait_valid = |
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tps_pdata->overcurrent_wait_valid; |
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ri->overcurrent_wait = tps_pdata->overcurrent_wait; |
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} |
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/* |
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* TPS5090 DCDC support the control from external digital input. |
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* Configure it as per platform data. |
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*/ |
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if (tps_pdata && is_dcdc(num) && tps_pdata->reg_init_data) { |
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if (tps_pdata->enable_ext_control) { |
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config.ena_gpiod = tps_pdata->gpiod; |
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ri->desc->ops = &tps65090_ext_control_ops; |
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} else { |
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ret = tps65090_regulator_disable_ext_control( |
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ri, tps_pdata); |
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if (ret < 0) { |
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dev_err(&pdev->dev, |
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"failed disable ext control\n"); |
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return ret; |
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} |
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} |
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} |
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config.dev = pdev->dev.parent; |
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config.driver_data = ri; |
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config.regmap = tps65090_mfd->rmap; |
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if (tps_pdata) |
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config.init_data = tps_pdata->reg_init_data; |
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else |
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config.init_data = NULL; |
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if (tps65090_reg_matches) |
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config.of_node = tps65090_reg_matches[num].of_node; |
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else |
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config.of_node = NULL; |
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|
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/* |
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* Hand the GPIO descriptor management over to the regulator |
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* core, remove it from devres management. |
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*/ |
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if (config.ena_gpiod) |
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devm_gpiod_unhinge(&pdev->dev, config.ena_gpiod); |
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rdev = devm_regulator_register(&pdev->dev, ri->desc, &config); |
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if (IS_ERR(rdev)) { |
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dev_err(&pdev->dev, "failed to register regulator %s\n", |
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ri->desc->name); |
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return PTR_ERR(rdev); |
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} |
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ri->rdev = rdev; |
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|
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if (ri->overcurrent_wait_valid) { |
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ret = tps65090_reg_set_overcurrent_wait(ri, rdev); |
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if (ret < 0) |
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return ret; |
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} |
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|
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/* Enable external control if it is require */ |
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if (tps_pdata && is_dcdc(num) && tps_pdata->reg_init_data && |
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tps_pdata->enable_ext_control) { |
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ret = tps65090_config_ext_control(ri, true); |
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if (ret < 0) |
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return ret; |
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} |
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} |
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platform_set_drvdata(pdev, pmic); |
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return 0; |
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} |
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static struct platform_driver tps65090_regulator_driver = { |
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.driver = { |
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.name = "tps65090-pmic", |
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}, |
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.probe = tps65090_regulator_probe, |
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}; |
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|
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static int __init tps65090_regulator_init(void) |
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{ |
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return platform_driver_register(&tps65090_regulator_driver); |
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} |
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subsys_initcall(tps65090_regulator_init); |
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|
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static void __exit tps65090_regulator_exit(void) |
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{ |
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platform_driver_unregister(&tps65090_regulator_driver); |
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} |
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module_exit(tps65090_regulator_exit); |
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MODULE_DESCRIPTION("tps65090 regulator driver"); |
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MODULE_AUTHOR("Venu Byravarasu <[email protected]>"); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_ALIAS("platform:tps65090-pmic");
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