Unverified Commit 7cbfbe23 authored by Konrad Dybcio's avatar Konrad Dybcio Committed by Mark Brown
Browse files

regulator: Introduce Qualcomm REFGEN regulator driver 



Modern Qualcomm SoCs have a REFGEN (reference voltage generator)
regulator, providing reference voltage to on-chip IP, like PHYs.

Add a driver to support toggling that regulator.

Signed-off-by: default avatarKonrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20230628-topic-refgen-v3-2-9fbf0e605d23@linaro.org


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent d16db38c

drivers/regulator/Kconfig

+11 −0
Original line number Diff line number Diff line
@@ -989,6 +989,17 @@ config REGULATOR_PWM 
	  This driver supports PWM controlled voltage regulators. PWM

	  duty cycle can increase or decrease the voltage.



config REGULATOR_QCOM_REFGEN

	tristate "Qualcomm REFGEN regulator driver"

	depends on HAS_IOMEM

	depends on REGMAP

	help

	  This driver supports the MMIO-mapped reference voltage regulator,

	  used internally by some PHYs on many Qualcomm SoCs.



	  Say M here if you want to include support for this regulator as

	  a module. The module will be named "qcom-refgen-regulator".



config REGULATOR_QCOM_RPM

	tristate "Qualcomm RPM regulator driver"

	depends on MFD_QCOM_RPM

drivers/regulator/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -108,6 +108,7 @@ obj-$(CONFIG_REGULATOR_MT6380) += mt6380-regulator.o 
obj-$(CONFIG_REGULATOR_MT6397)	+= mt6397-regulator.o

obj-$(CONFIG_REGULATOR_MTK_DVFSRC) += mtk-dvfsrc-regulator.o

obj-$(CONFIG_REGULATOR_QCOM_LABIBB) += qcom-labibb-regulator.o

obj-$(CONFIG_REGULATOR_QCOM_REFGEN) += qcom-refgen-regulator.o

obj-$(CONFIG_REGULATOR_QCOM_RPM) += qcom_rpm-regulator.o

obj-$(CONFIG_REGULATOR_QCOM_RPMH) += qcom-rpmh-regulator.o

obj-$(CONFIG_REGULATOR_QCOM_SMD_RPM) += qcom_smd-regulator.o

drivers/regulator/qcom-refgen-regulator.c

0 → 100644
+154 −0
Original line number Diff line number Diff line 
// 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");