linux/drivers/soc/samsung/exynos-pmu.c
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   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        { /*sentinel*/ },
  99};
 100
 101static const struct mfd_cell exynos_pmu_devs[] = {
 102        { .name = "exynos-clkout", },
 103};
 104
 105struct regmap *exynos_get_pmu_regmap(void)
 106{
 107        struct device_node *np = of_find_matching_node(NULL,
 108                                                      exynos_pmu_of_device_ids);
 109        if (np)
 110                return syscon_node_to_regmap(np);
 111        return ERR_PTR(-ENODEV);
 112}
 113EXPORT_SYMBOL_GPL(exynos_get_pmu_regmap);
 114
 115static int exynos_pmu_probe(struct platform_device *pdev)
 116{
 117        struct device *dev = &pdev->dev;
 118        int ret;
 119
 120        pmu_base_addr = devm_platform_ioremap_resource(pdev, 0);
 121        if (IS_ERR(pmu_base_addr))
 122                return PTR_ERR(pmu_base_addr);
 123
 124        pmu_context = devm_kzalloc(&pdev->dev,
 125                        sizeof(struct exynos_pmu_context),
 126                        GFP_KERNEL);
 127        if (!pmu_context)
 128                return -ENOMEM;
 129        pmu_context->dev = dev;
 130        pmu_context->pmu_data = of_device_get_match_data(dev);
 131
 132        if (pmu_context->pmu_data && pmu_context->pmu_data->pmu_init)
 133                pmu_context->pmu_data->pmu_init();
 134
 135        platform_set_drvdata(pdev, pmu_context);
 136
 137        ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE, exynos_pmu_devs,
 138                                   ARRAY_SIZE(exynos_pmu_devs), NULL, 0, NULL);
 139        if (ret)
 140                return ret;
 141
 142        if (devm_of_platform_populate(dev))
 143                dev_err(dev, "Error populating children, reboot and poweroff might not work properly\n");
 144
 145        dev_dbg(dev, "Exynos PMU Driver probe done\n");
 146        return 0;
 147}
 148
 149static struct platform_driver exynos_pmu_driver = {
 150        .driver  = {
 151                .name   = "exynos-pmu",
 152                .of_match_table = exynos_pmu_of_device_ids,
 153        },
 154        .probe = exynos_pmu_probe,
 155};
 156
 157static int __init exynos_pmu_init(void)
 158{
 159        return platform_driver_register(&exynos_pmu_driver);
 160
 161}
 162postcore_initcall(exynos_pmu_init);
 163