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
  20 struct exynos_pmu_context {
  21         struct device *dev;
  22         const struct exynos_pmu_data *pmu_data;
  23 };
  24
  25 void __iomem *pmu_base_addr;
  26 static struct exynos_pmu_context *pmu_context;
  27
  28 void pmu_raw_writel(u32 val, u32 offset)
  29 {
  30         writel_relaxed(val, pmu_base_addr + offset);
  31 }
  32
  33 u32 pmu_raw_readl(u32 offset)
  34 {
  35         return readl_relaxed(pmu_base_addr + offset);
  36 }
  37
  38 void 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  */
  74 static 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
 100 struct 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 }
 108 EXPORT_SYMBOL_GPL(exynos_get_pmu_regmap);
 109
 110 static 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
 140 static 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
 148 static int __init exynos_pmu_init(void)
 149 {
 150         return platform_driver_register(&exynos_pmu_driver);
 151
 152 }
 153 postcore_initcall(exynos_pmu_init);