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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vexpress-regulator.c (2691B)

      1// SPDX-License-Identifier: GPL-2.0
      2//
      3// Copyright (C) 2012 ARM Limited
      4
      5#define DRVNAME "vexpress-regulator"
      6#define pr_fmt(fmt) DRVNAME ": " fmt
      7
      8#include <linux/device.h>
      9#include <linux/err.h>
     10#include <linux/module.h>
     11#include <linux/of_device.h>
     12#include <linux/regulator/driver.h>
     13#include <linux/regulator/machine.h>
     14#include <linux/regulator/of_regulator.h>
     15#include <linux/vexpress.h>
     16
     17static int vexpress_regulator_get_voltage(struct regulator_dev *regdev)
     18{
     19	unsigned int uV;
     20	int err = regmap_read(regdev->regmap, 0, &uV);
     21
     22	return err ? err : uV;
     23}
     24
     25static int vexpress_regulator_set_voltage(struct regulator_dev *regdev,
     26		int min_uV, int max_uV, unsigned *selector)
     27{
     28	return regmap_write(regdev->regmap, 0, min_uV);
     29}
     30
     31static const struct regulator_ops vexpress_regulator_ops_ro = {
     32	.get_voltage = vexpress_regulator_get_voltage,
     33};
     34
     35static const struct regulator_ops vexpress_regulator_ops = {
     36	.get_voltage = vexpress_regulator_get_voltage,
     37	.set_voltage = vexpress_regulator_set_voltage,
     38};
     39
     40static int vexpress_regulator_probe(struct platform_device *pdev)
     41{
     42	struct regulator_desc *desc;
     43	struct regulator_init_data *init_data;
     44	struct regulator_config config = { };
     45	struct regulator_dev *rdev;
     46	struct regmap *regmap;
     47
     48	desc = devm_kzalloc(&pdev->dev, sizeof(*desc), GFP_KERNEL);
     49	if (!desc)
     50		return -ENOMEM;
     51
     52	regmap = devm_regmap_init_vexpress_config(&pdev->dev);
     53	if (IS_ERR(regmap))
     54		return PTR_ERR(regmap);
     55
     56	desc->name = dev_name(&pdev->dev);
     57	desc->type = REGULATOR_VOLTAGE;
     58	desc->owner = THIS_MODULE;
     59	desc->continuous_voltage_range = true;
     60
     61	init_data = of_get_regulator_init_data(&pdev->dev, pdev->dev.of_node,
     62					       desc);
     63	if (!init_data)
     64		return -EINVAL;
     65
     66	init_data->constraints.apply_uV = 0;
     67	if (init_data->constraints.min_uV && init_data->constraints.max_uV)
     68		desc->ops = &vexpress_regulator_ops;
     69	else
     70		desc->ops = &vexpress_regulator_ops_ro;
     71
     72	config.regmap = regmap;
     73	config.dev = &pdev->dev;
     74	config.init_data = init_data;
     75	config.of_node = pdev->dev.of_node;
     76
     77	rdev = devm_regulator_register(&pdev->dev, desc, &config);
     78	return PTR_ERR_OR_ZERO(rdev);
     79}
     80
     81static const struct of_device_id vexpress_regulator_of_match[] = {
     82	{ .compatible = "arm,vexpress-volt", },
     83	{ }
     84};
     85MODULE_DEVICE_TABLE(of, vexpress_regulator_of_match);
     86
     87static struct platform_driver vexpress_regulator_driver = {
     88	.probe = vexpress_regulator_probe,
     89	.driver	= {
     90		.name = DRVNAME,
     91		.of_match_table = vexpress_regulator_of_match,
     92	},
     93};
     94
     95module_platform_driver(vexpress_regulator_driver);
     96
     97MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>");
     98MODULE_DESCRIPTION("Versatile Express regulator");
     99MODULE_LICENSE("GPL");
    100MODULE_ALIAS("platform:vexpress-regulator");