diff options
Diffstat (limited to 'drivers/regulator/qcom-refgen-regulator.c')
| -rw-r--r-- | drivers/regulator/qcom-refgen-regulator.c | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/drivers/regulator/qcom-refgen-regulator.c b/drivers/regulator/qcom-refgen-regulator.c new file mode 100644 index 000000000000..656fe330d38f --- /dev/null +++ b/drivers/regulator/qcom-refgen-regulator.c @@ -0,0 +1,154 @@ +// SPDX-License-Identifier: GPL-2.0-only +// Copyright (c) 2017, 2019-2020, The Linux Foundation. All rights reserved. +// Copyright (c) 2023, Linaro Limited + +#include <linux/bitfield.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <linux/regulator/driver.h> +#include <linux/regulator/machine.h> +#include <linux/regulator/of_regulator.h> + +#define REFGEN_REG_BIAS_EN 0x08 +#define REFGEN_BIAS_EN_MASK GENMASK(2, 0) + #define REFGEN_BIAS_EN_ENABLE 0x7 + #define REFGEN_BIAS_EN_DISABLE 0x6 + +#define REFGEN_REG_BG_CTRL 0x14 +#define REFGEN_BG_CTRL_MASK GENMASK(2, 1) + #define REFGEN_BG_CTRL_ENABLE 0x3 + #define REFGEN_BG_CTRL_DISABLE 0x2 + +#define REFGEN_REG_PWRDWN_CTRL5 0x80 +#define REFGEN_PWRDWN_CTRL5_MASK BIT(0) + #define REFGEN_PWRDWN_CTRL5_ENABLE 0x1 + +static int qcom_sdm845_refgen_enable(struct regulator_dev *rdev) +{ + regmap_update_bits(rdev->regmap, REFGEN_REG_BG_CTRL, REFGEN_BG_CTRL_MASK, + FIELD_PREP(REFGEN_BG_CTRL_MASK, REFGEN_BG_CTRL_ENABLE)); + + regmap_write(rdev->regmap, REFGEN_REG_BIAS_EN, + FIELD_PREP(REFGEN_BIAS_EN_MASK, REFGEN_BIAS_EN_ENABLE)); + + return 0; +} + +static int qcom_sdm845_refgen_disable(struct regulator_dev *rdev) +{ + regmap_write(rdev->regmap, REFGEN_REG_BIAS_EN, + FIELD_PREP(REFGEN_BIAS_EN_MASK, REFGEN_BIAS_EN_DISABLE)); + + regmap_update_bits(rdev->regmap, REFGEN_REG_BG_CTRL, REFGEN_BG_CTRL_MASK, + FIELD_PREP(REFGEN_BG_CTRL_MASK, REFGEN_BG_CTRL_DISABLE)); + + return 0; +} + +static int qcom_sdm845_refgen_is_enabled(struct regulator_dev *rdev) +{ + u32 val; + + regmap_read(rdev->regmap, REFGEN_REG_BG_CTRL, &val); + if (FIELD_GET(REFGEN_BG_CTRL_MASK, val) != REFGEN_BG_CTRL_ENABLE) + return 0; + + regmap_read(rdev->regmap, REFGEN_REG_BIAS_EN, &val); + if (FIELD_GET(REFGEN_BIAS_EN_MASK, val) != REFGEN_BIAS_EN_ENABLE) + return 0; + + return 1; +} + +static struct regulator_desc sdm845_refgen_desc = { + .enable_time = 5, + .name = "refgen", + .owner = THIS_MODULE, + .type = REGULATOR_VOLTAGE, + .ops = &(const struct regulator_ops) { + .enable = qcom_sdm845_refgen_enable, + .disable = qcom_sdm845_refgen_disable, + .is_enabled = qcom_sdm845_refgen_is_enabled, + }, +}; + +static struct regulator_desc sm8250_refgen_desc = { + .enable_reg = REFGEN_REG_PWRDWN_CTRL5, + .enable_mask = REFGEN_PWRDWN_CTRL5_MASK, + .enable_val = REFGEN_PWRDWN_CTRL5_ENABLE, + .disable_val = 0, + .enable_time = 5, + .name = "refgen", + .owner = THIS_MODULE, + .type = REGULATOR_VOLTAGE, + .ops = &(const struct regulator_ops) { + .enable = regulator_enable_regmap, + .disable = regulator_disable_regmap, + .is_enabled = regulator_is_enabled_regmap, + }, +}; + +static const struct regmap_config qcom_refgen_regmap_config = { + .reg_bits = 32, + .reg_stride = 4, + .val_bits = 32, + .fast_io = true, +}; + +static int qcom_refgen_probe(struct platform_device *pdev) +{ + struct regulator_init_data *init_data; + struct regulator_config config = {}; + const struct regulator_desc *rdesc; + struct device *dev = &pdev->dev; + struct regulator_dev *rdev; + struct regmap *regmap; + void __iomem *base; + + rdesc = of_device_get_match_data(dev); + if (!rdesc) + return -ENODATA; + + base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(base)) + return PTR_ERR(base); + + regmap = devm_regmap_init_mmio(dev, base, &qcom_refgen_regmap_config); + if (IS_ERR(regmap)) + return PTR_ERR(regmap); + + init_data = of_get_regulator_init_data(dev, dev->of_node, rdesc); + if (!init_data) + return -ENOMEM; + + config.dev = dev; + config.init_data = init_data; + config.of_node = dev->of_node; + config.regmap = regmap; + + rdev = devm_regulator_register(dev, rdesc, &config); + if (IS_ERR(rdev)) + return PTR_ERR(rdev); + + return 0; +} + +static const struct of_device_id qcom_refgen_match_table[] = { + { .compatible = "qcom,sdm845-refgen-regulator", .data = &sdm845_refgen_desc }, + { .compatible = "qcom,sm8250-refgen-regulator", .data = &sm8250_refgen_desc }, + { } +}; + +static struct platform_driver qcom_refgen_driver = { + .probe = qcom_refgen_probe, + .driver = { + .name = "qcom-refgen-regulator", + .of_match_table = qcom_refgen_match_table, + }, +}; +module_platform_driver(qcom_refgen_driver); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Qualcomm REFGEN regulator driver"); |