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/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
  21 struct exynos_pmu_context {
  22         struct device *dev;
  23         const struct exynos_pmu_data *pmu_data;
  24 };
  25
  26 void __iomem *pmu_base_addr;
  27 static struct exynos_pmu_context *pmu_context;
  28
  29 void pmu_raw_writel(u32 val, u32 offset)
  30 {
  31         writel_relaxed(val, pmu_base_addr + offset);
  32 }
  33
  34 u32 pmu_raw_readl(u32 offset)
  35 {
  36         return readl_relaxed(pmu_base_addr + offset);
  37 }
  38
  39 void 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  */
  75 static 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
 101 static const struct mfd_cell exynos_pmu_devs[] = {
 102         { .name = "exynos-clkout", },
 103 };
 104
 105 struct 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 }
 113 EXPORT_SYMBOL_GPL(exynos_get_pmu_regmap);
 114
 115 static 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
 149 static 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
 157 static int __init exynos_pmu_init(void)
 158 {
 159         return platform_driver_register(&exynos_pmu_driver);
 160
 161 }
 162 postcore_initcall(exynos_pmu_init);