cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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stm32-booster.c (3593B)

      1// SPDX-License-Identifier: GPL-2.0
      2// Copyright (C) STMicroelectronics 2019
      3// Author(s): Fabrice Gasnier <fabrice.gasnier@st.com>.
      4
      5#include <linux/mfd/syscon.h>
      6#include <linux/module.h>
      7#include <linux/of_device.h>
      8#include <linux/platform_device.h>
      9#include <linux/regmap.h>
     10#include <linux/regulator/driver.h>
     11#include <linux/regulator/of_regulator.h>
     12
     13/* STM32H7 SYSCFG register */
     14#define STM32H7_SYSCFG_PMCR		0x04
     15#define STM32H7_SYSCFG_BOOSTE_MASK	BIT(8)
     16
     17/* STM32MP1 SYSCFG has set and clear registers */
     18#define STM32MP1_SYSCFG_PMCSETR		0x04
     19#define STM32MP1_SYSCFG_PMCCLRR		0x44
     20#define STM32MP1_SYSCFG_EN_BOOSTER_MASK	BIT(8)
     21
     22static const struct regulator_ops stm32h7_booster_ops = {
     23	.enable		= regulator_enable_regmap,
     24	.disable	= regulator_disable_regmap,
     25	.is_enabled	= regulator_is_enabled_regmap,
     26};
     27
     28static const struct regulator_desc stm32h7_booster_desc = {
     29	.name = "booster",
     30	.supply_name = "vdda",
     31	.n_voltages = 1,
     32	.type = REGULATOR_VOLTAGE,
     33	.fixed_uV = 3300000,
     34	.ramp_delay = 66000, /* up to 50us to stabilize */
     35	.ops = &stm32h7_booster_ops,
     36	.enable_reg = STM32H7_SYSCFG_PMCR,
     37	.enable_mask = STM32H7_SYSCFG_BOOSTE_MASK,
     38	.owner = THIS_MODULE,
     39};
     40
     41static int stm32mp1_booster_enable(struct regulator_dev *rdev)
     42{
     43	return regmap_write(rdev->regmap, STM32MP1_SYSCFG_PMCSETR,
     44			    STM32MP1_SYSCFG_EN_BOOSTER_MASK);
     45}
     46
     47static int stm32mp1_booster_disable(struct regulator_dev *rdev)
     48{
     49	return regmap_write(rdev->regmap, STM32MP1_SYSCFG_PMCCLRR,
     50			    STM32MP1_SYSCFG_EN_BOOSTER_MASK);
     51}
     52
     53static const struct regulator_ops stm32mp1_booster_ops = {
     54	.enable		= stm32mp1_booster_enable,
     55	.disable	= stm32mp1_booster_disable,
     56	.is_enabled	= regulator_is_enabled_regmap,
     57};
     58
     59static const struct regulator_desc stm32mp1_booster_desc = {
     60	.name = "booster",
     61	.supply_name = "vdda",
     62	.n_voltages = 1,
     63	.type = REGULATOR_VOLTAGE,
     64	.fixed_uV = 3300000,
     65	.ramp_delay = 66000,
     66	.ops = &stm32mp1_booster_ops,
     67	.enable_reg = STM32MP1_SYSCFG_PMCSETR,
     68	.enable_mask = STM32MP1_SYSCFG_EN_BOOSTER_MASK,
     69	.owner = THIS_MODULE,
     70};
     71
     72static int stm32_booster_probe(struct platform_device *pdev)
     73{
     74	struct device *dev = &pdev->dev;
     75	struct device_node *np = pdev->dev.of_node;
     76	struct regulator_config config = { };
     77	const struct regulator_desc *desc;
     78	struct regulator_dev *rdev;
     79	struct regmap *regmap;
     80	int ret;
     81
     82	regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
     83	if (IS_ERR(regmap))
     84		return PTR_ERR(regmap);
     85
     86	desc = (const struct regulator_desc *)
     87		of_match_device(dev->driver->of_match_table, dev)->data;
     88
     89	config.regmap = regmap;
     90	config.dev = dev;
     91	config.of_node = np;
     92	config.init_data = of_get_regulator_init_data(dev, np, desc);
     93
     94	rdev = devm_regulator_register(dev, desc, &config);
     95	if (IS_ERR(rdev)) {
     96		ret = PTR_ERR(rdev);
     97		dev_err(dev, "register failed with error %d\n", ret);
     98		return ret;
     99	}
    100
    101	return 0;
    102}
    103
    104static const struct of_device_id __maybe_unused stm32_booster_of_match[] = {
    105	{
    106		.compatible = "st,stm32h7-booster",
    107		.data = (void *)&stm32h7_booster_desc
    108	}, {
    109		.compatible = "st,stm32mp1-booster",
    110		.data = (void *)&stm32mp1_booster_desc
    111	}, {
    112	},
    113};
    114MODULE_DEVICE_TABLE(of, stm32_booster_of_match);
    115
    116static struct platform_driver stm32_booster_driver = {
    117	.probe = stm32_booster_probe,
    118	.driver = {
    119		.name  = "stm32-booster",
    120		.of_match_table = of_match_ptr(stm32_booster_of_match),
    121	},
    122};
    123module_platform_driver(stm32_booster_driver);
    124
    125MODULE_LICENSE("GPL v2");
    126MODULE_AUTHOR("Fabrice Gasnier <fabrice.gasnier@st.com>");
    127MODULE_DESCRIPTION("STMicroelectronics STM32 booster regulator driver");
    128MODULE_ALIAS("platform:stm32-booster");