drivers/soc/samsung/exynos-pmu.c

   1 /*
   2  * Copyright (c) 2011-2014 Samsung Electronics Co., Ltd.
   3  *              http://www.samsung.com/
   4  *
   5  * EXYNOS - CPU PMU(Power Management Unit) support
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/of.h>
  13 #include <linux/of_address.h>
  14 #include <linux/of_device.h>
  15 #include <linux/mfd/syscon.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/delay.h>
  18
  19 #include <linux/soc/samsung/exynos-regs-pmu.h>
  20 #include <linux/soc/samsung/exynos-pmu.h>
  21
  22 #include "exynos-pmu.h"
  23
  24 struct exynos_pmu_context {
  25         struct device *dev;
  26         const struct exynos_pmu_data *pmu_data;
  27 };
  28
  29 void __iomem *pmu_base_addr;
  30 static struct exynos_pmu_context *pmu_context;
  31
  32 void pmu_raw_writel(u32 val, u32 offset)
  33 {
  34         writel_relaxed(val, pmu_base_addr + offset);
  35 }
  36
  37 u32 pmu_raw_readl(u32 offset)
  38 {
  39         return readl_relaxed(pmu_base_addr + offset);
  40 }
  41
  42 void exynos_sys_powerdown_conf(enum sys_powerdown mode)
  43 {
  44         unsigned int i;
  45         const struct exynos_pmu_data *pmu_data;
  46
  47         if (!pmu_context || !pmu_context->pmu_data)
  48                 return;
  49
  50         pmu_data = pmu_context->pmu_data;
  51
  52         if (pmu_data->powerdown_conf)
  53                 pmu_data->powerdown_conf(mode);
  54
  55         if (pmu_data->pmu_config) {
  56                 for (i = 0; (pmu_data->pmu_config[i].offset != PMU_TABLE_END); i++)
  57                         pmu_raw_writel(pmu_data->pmu_config[i].val[mode],
  58                                         pmu_data->pmu_config[i].offset);
  59         }
  60
  61         if (pmu_data->powerdown_conf_extra)
  62                 pmu_data->powerdown_conf_extra(mode);
  63 }
  64
  65 /*
  66  * Split the data between ARM architectures because it is relatively big
  67  * and useless on other arch.
  68  */
  69 #ifdef CONFIG_EXYNOS_PMU_ARM_DRIVERS
  70 #define exynos_pmu_data_arm_ptr(data)   (&data)
  71 #else
  72 #define exynos_pmu_data_arm_ptr(data)   NULL
  73 #endif
  74
  75 /*
  76  * PMU platform driver and devicetree bindings.
  77  */
  78 static const struct of_device_id exynos_pmu_of_device_ids[] = {
  79         {
  80                 .compatible = "samsung,exynos3250-pmu",
  81                 .data = exynos_pmu_data_arm_ptr(exynos3250_pmu_data),
  82         }, {
  83                 .compatible = "samsung,exynos4210-pmu",
  84                 .data = exynos_pmu_data_arm_ptr(exynos4210_pmu_data),
  85         }, {
  86                 .compatible = "samsung,exynos4412-pmu",
  87                 .data = exynos_pmu_data_arm_ptr(exynos4412_pmu_data),
  88         }, {
  89                 .compatible = "samsung,exynos5250-pmu",
  90                 .data = exynos_pmu_data_arm_ptr(exynos5250_pmu_data),
  91         }, {
  92                 .compatible = "samsung,exynos5420-pmu",
  93                 .data = exynos_pmu_data_arm_ptr(exynos5420_pmu_data),
  94         }, {
  95                 .compatible = "samsung,exynos5433-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         dev_dbg(dev, "Exynos PMU Driver probe done\n");
 134         return 0;
 135 }
 136
 137 static struct platform_driver exynos_pmu_driver = {
 138         .driver  = {
 139                 .name   = "exynos-pmu",
 140                 .of_match_table = exynos_pmu_of_device_ids,
 141         },
 142         .probe = exynos_pmu_probe,
 143 };
 144
 145 static int __init exynos_pmu_init(void)
 146 {
 147         return platform_driver_register(&exynos_pmu_driver);
 148
 149 }
 150 postcore_initcall(exynos_pmu_init);