LXR linux/drivers/soc/samsung/exynos-pmu.c

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