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199 lines
5.1 KiB
C
199 lines
5.1 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2019-2020, The Linux Foundation. All rights reserved.
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* Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
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* Copyright (c) 2024 Linaro Limited
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*/
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#include <linux/array_size.h>
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#include <linux/bits.h>
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#include <linux/device.h>
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#include <linux/math.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/regulator/driver.h>
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#include <asm/byteorder.h>
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#define DEFAULT_VOLTAGE_STEPPER_RATE 38400
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#define LDO_STEPPER_CTL_REG 0x3b
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#define STEP_RATE_MASK GENMASK(1, 0)
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#define LDO_VSET_LB_REG 0x40
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#define LDO_ENABLE_REG 0x46
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#define ENABLE_BIT BIT(7)
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struct pm8008_regulator {
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struct regmap *regmap;
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struct regulator_desc desc;
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unsigned int base;
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};
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struct pm8008_regulator_data {
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const char *name;
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const char *supply_name;
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unsigned int base;
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int min_dropout_uV;
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const struct linear_range *voltage_range;
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};
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static const struct linear_range nldo_ranges[] = {
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REGULATOR_LINEAR_RANGE(528000, 0, 122, 8000),
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};
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static const struct linear_range pldo_ranges[] = {
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REGULATOR_LINEAR_RANGE(1504000, 0, 237, 8000),
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};
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static const struct pm8008_regulator_data pm8008_reg_data[] = {
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{ "ldo1", "vdd-l1-l2", 0x4000, 225000, nldo_ranges, },
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{ "ldo2", "vdd-l1-l2", 0x4100, 225000, nldo_ranges, },
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{ "ldo3", "vdd-l3-l4", 0x4200, 300000, pldo_ranges, },
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{ "ldo4", "vdd-l3-l4", 0x4300, 300000, pldo_ranges, },
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{ "ldo5", "vdd-l5", 0x4400, 200000, pldo_ranges, },
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{ "ldo6", "vdd-l6", 0x4500, 200000, pldo_ranges, },
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{ "ldo7", "vdd-l7", 0x4600, 200000, pldo_ranges, },
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};
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static int pm8008_regulator_set_voltage_sel(struct regulator_dev *rdev, unsigned int sel)
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{
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struct pm8008_regulator *preg = rdev_get_drvdata(rdev);
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unsigned int mV;
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__le16 val;
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int ret;
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ret = regulator_list_voltage_linear_range(rdev, sel);
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if (ret < 0)
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return ret;
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mV = DIV_ROUND_UP(ret, 1000);
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val = cpu_to_le16(mV);
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ret = regmap_bulk_write(preg->regmap, preg->base + LDO_VSET_LB_REG,
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&val, sizeof(val));
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if (ret < 0)
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return ret;
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return 0;
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}
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static int pm8008_regulator_get_voltage_sel(struct regulator_dev *rdev)
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{
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struct pm8008_regulator *preg = rdev_get_drvdata(rdev);
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unsigned int uV;
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__le16 val;
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int ret;
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ret = regmap_bulk_read(preg->regmap, preg->base + LDO_VSET_LB_REG,
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&val, sizeof(val));
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if (ret < 0)
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return ret;
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uV = le16_to_cpu(val) * 1000;
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return (uV - preg->desc.min_uV) / preg->desc.uV_step;
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}
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static const struct regulator_ops pm8008_regulator_ops = {
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.list_voltage = regulator_list_voltage_linear,
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.set_voltage_sel = pm8008_regulator_set_voltage_sel,
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.get_voltage_sel = pm8008_regulator_get_voltage_sel,
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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 int pm8008_regulator_probe(struct platform_device *pdev)
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{
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const struct pm8008_regulator_data *data;
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struct regulator_config config = {};
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struct device *dev = &pdev->dev;
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struct pm8008_regulator *preg;
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struct regulator_desc *desc;
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struct regulator_dev *rdev;
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struct regmap *regmap;
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unsigned int val;
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int ret, i;
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regmap = dev_get_regmap(dev->parent, "secondary");
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if (!regmap)
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return -EINVAL;
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for (i = 0; i < ARRAY_SIZE(pm8008_reg_data); i++) {
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data = &pm8008_reg_data[i];
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preg = devm_kzalloc(dev, sizeof(*preg), GFP_KERNEL);
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if (!preg)
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return -ENOMEM;
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preg->regmap = regmap;
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preg->base = data->base;
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desc = &preg->desc;
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desc->name = data->name;
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desc->supply_name = data->supply_name;
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desc->of_match = data->name;
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desc->regulators_node = of_match_ptr("regulators");
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desc->ops = &pm8008_regulator_ops;
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desc->type = REGULATOR_VOLTAGE;
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desc->owner = THIS_MODULE;
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desc->linear_ranges = data->voltage_range;
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desc->n_linear_ranges = 1;
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desc->uV_step = desc->linear_ranges[0].step;
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desc->min_uV = desc->linear_ranges[0].min;
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desc->n_voltages = linear_range_values_in_range(&desc->linear_ranges[0]);
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ret = regmap_read(regmap, preg->base + LDO_STEPPER_CTL_REG, &val);
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if (ret < 0) {
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dev_err(dev, "failed to read step rate: %d\n", ret);
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return ret;
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}
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val &= STEP_RATE_MASK;
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desc->ramp_delay = DEFAULT_VOLTAGE_STEPPER_RATE >> val;
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desc->min_dropout_uV = data->min_dropout_uV;
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desc->enable_reg = preg->base + LDO_ENABLE_REG;
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desc->enable_mask = ENABLE_BIT;
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config.dev = dev->parent;
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config.driver_data = preg;
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config.regmap = regmap;
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rdev = devm_regulator_register(dev, desc, &config);
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if (IS_ERR(rdev)) {
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ret = PTR_ERR(rdev);
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dev_err(dev, "failed to register regulator %s: %d\n",
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desc->name, ret);
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return ret;
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}
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}
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return 0;
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}
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static const struct platform_device_id pm8008_regulator_id_table[] = {
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{ "pm8008-regulator" },
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{ }
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};
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MODULE_DEVICE_TABLE(platform, pm8008_regulator_id_table);
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static struct platform_driver pm8008_regulator_driver = {
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.driver = {
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.name = "qcom-pm8008-regulator",
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},
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.probe = pm8008_regulator_probe,
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.id_table = pm8008_regulator_id_table,
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};
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module_platform_driver(pm8008_regulator_driver);
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MODULE_DESCRIPTION("Qualcomm PM8008 PMIC regulator driver");
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MODULE_LICENSE("GPL");
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