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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exynos-pmu.c (4061B)

      1// SPDX-License-Identifier: GPL-2.0
      2//
      3// Copyright (c) 2011-2014 Samsung Electronics Co., Ltd.
      4//		http://www.samsung.com/
      5//
      6// Exynos - CPU PMU(Power Management Unit) support
      7
      8#include <linux/of.h>
      9#include <linux/of_address.h>
     10#include <linux/of_device.h>
     11#include <linux/mfd/core.h>
     12#include <linux/mfd/syscon.h>
     13#include <linux/platform_device.h>
     14#include <linux/delay.h>
     15
     16#include <linux/soc/samsung/exynos-regs-pmu.h>
     17#include <linux/soc/samsung/exynos-pmu.h>
     18
     19#include "exynos-pmu.h"
     20
     21struct exynos_pmu_context {
     22	struct device *dev;
     23	const struct exynos_pmu_data *pmu_data;
     24};
     25
     26void __iomem *pmu_base_addr;
     27static struct exynos_pmu_context *pmu_context;
     28
     29void pmu_raw_writel(u32 val, u32 offset)
     30{
     31	writel_relaxed(val, pmu_base_addr + offset);
     32}
     33
     34u32 pmu_raw_readl(u32 offset)
     35{
     36	return readl_relaxed(pmu_base_addr + offset);
     37}
     38
     39void exynos_sys_powerdown_conf(enum sys_powerdown mode)
     40{
     41	unsigned int i;
     42	const struct exynos_pmu_data *pmu_data;
     43
     44	if (!pmu_context || !pmu_context->pmu_data)
     45		return;
     46
     47	pmu_data = pmu_context->pmu_data;
     48
     49	if (pmu_data->powerdown_conf)
     50		pmu_data->powerdown_conf(mode);
     51
     52	if (pmu_data->pmu_config) {
     53		for (i = 0; (pmu_data->pmu_config[i].offset != PMU_TABLE_END); i++)
     54			pmu_raw_writel(pmu_data->pmu_config[i].val[mode],
     55					pmu_data->pmu_config[i].offset);
     56	}
     57
     58	if (pmu_data->powerdown_conf_extra)
     59		pmu_data->powerdown_conf_extra(mode);
     60}
     61
     62/*
     63 * Split the data between ARM architectures because it is relatively big
     64 * and useless on other arch.
     65 */
     66#ifdef CONFIG_EXYNOS_PMU_ARM_DRIVERS
     67#define exynos_pmu_data_arm_ptr(data)	(&data)
     68#else
     69#define exynos_pmu_data_arm_ptr(data)	NULL
     70#endif
     71
     72/*
     73 * PMU platform driver and devicetree bindings.
     74 */
     75static const struct of_device_id exynos_pmu_of_device_ids[] = {
     76	{
     77		.compatible = "samsung,exynos3250-pmu",
     78		.data = exynos_pmu_data_arm_ptr(exynos3250_pmu_data),
     79	}, {
     80		.compatible = "samsung,exynos4210-pmu",
     81		.data = exynos_pmu_data_arm_ptr(exynos4210_pmu_data),
     82	}, {
     83		.compatible = "samsung,exynos4412-pmu",
     84		.data = exynos_pmu_data_arm_ptr(exynos4412_pmu_data),
     85	}, {
     86		.compatible = "samsung,exynos5250-pmu",
     87		.data = exynos_pmu_data_arm_ptr(exynos5250_pmu_data),
     88	}, {
     89		.compatible = "samsung,exynos5410-pmu",
     90	}, {
     91		.compatible = "samsung,exynos5420-pmu",
     92		.data = exynos_pmu_data_arm_ptr(exynos5420_pmu_data),
     93	}, {
     94		.compatible = "samsung,exynos5433-pmu",
     95	}, {
     96		.compatible = "samsung,exynos7-pmu",
     97	}, {
     98		.compatible = "samsung,exynos850-pmu",
     99	},
    100	{ /*sentinel*/ },
    101};
    102
    103static const struct mfd_cell exynos_pmu_devs[] = {
    104	{ .name = "exynos-clkout", },
    105};
    106
    107struct regmap *exynos_get_pmu_regmap(void)
    108{
    109	struct device_node *np = of_find_matching_node(NULL,
    110						      exynos_pmu_of_device_ids);
    111	if (np)
    112		return syscon_node_to_regmap(np);
    113	return ERR_PTR(-ENODEV);
    114}
    115EXPORT_SYMBOL_GPL(exynos_get_pmu_regmap);
    116
    117static int exynos_pmu_probe(struct platform_device *pdev)
    118{
    119	struct device *dev = &pdev->dev;
    120	int ret;
    121
    122	pmu_base_addr = devm_platform_ioremap_resource(pdev, 0);
    123	if (IS_ERR(pmu_base_addr))
    124		return PTR_ERR(pmu_base_addr);
    125
    126	pmu_context = devm_kzalloc(&pdev->dev,
    127			sizeof(struct exynos_pmu_context),
    128			GFP_KERNEL);
    129	if (!pmu_context)
    130		return -ENOMEM;
    131	pmu_context->dev = dev;
    132	pmu_context->pmu_data = of_device_get_match_data(dev);
    133
    134	if (pmu_context->pmu_data && pmu_context->pmu_data->pmu_init)
    135		pmu_context->pmu_data->pmu_init();
    136
    137	platform_set_drvdata(pdev, pmu_context);
    138
    139	ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE, exynos_pmu_devs,
    140				   ARRAY_SIZE(exynos_pmu_devs), NULL, 0, NULL);
    141	if (ret)
    142		return ret;
    143
    144	if (devm_of_platform_populate(dev))
    145		dev_err(dev, "Error populating children, reboot and poweroff might not work properly\n");
    146
    147	dev_dbg(dev, "Exynos PMU Driver probe done\n");
    148	return 0;
    149}
    150
    151static struct platform_driver exynos_pmu_driver = {
    152	.driver  = {
    153		.name   = "exynos-pmu",
    154		.of_match_table = exynos_pmu_of_device_ids,
    155	},
    156	.probe = exynos_pmu_probe,
    157};
    158
    159static int __init exynos_pmu_init(void)
    160{
    161	return platform_driver_register(&exynos_pmu_driver);
    162
    163}
    164postcore_initcall(exynos_pmu_init);