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         if (pmu_data->pmu_config_extra) {
  65                 for (i = 0; pmu_data->pmu_config_extra[i].offset != PMU_TABLE_END; i++)
  66                         pmu_raw_writel(pmu_data->pmu_config_extra[i].val[mode],
  67                                         pmu_data->pmu_config_extra[i].offset);
  68         }
  69 }
  70
  71 /*
  72  * Split the data between ARM architectures because it is relatively big
  73  * and useless on other arch.
  74  */
  75 #ifdef CONFIG_EXYNOS_PMU_ARM_DRIVERS
  76 #define exynos_pmu_data_arm_ptr(data)   (&data)
  77 #else
  78 #define exynos_pmu_data_arm_ptr(data)   NULL
  79 #endif
  80
  81 /*
  82  * PMU platform driver and devicetree bindings.
  83  */
  84 static const struct of_device_id exynos_pmu_of_device_ids[] = {
  85         {
  86                 .compatible = "samsung,exynos3250-pmu",
  87                 .data = exynos_pmu_data_arm_ptr(exynos3250_pmu_data),
  88         }, {
  89                 .compatible = "samsung,exynos4210-pmu",
  90                 .data = exynos_pmu_data_arm_ptr(exynos4210_pmu_data),
  91         }, {
  92                 .compatible = "samsung,exynos4212-pmu",
  93                 .data = exynos_pmu_data_arm_ptr(exynos4212_pmu_data),
  94         }, {
  95                 .compatible = "samsung,exynos4412-pmu",
  96                 .data = exynos_pmu_data_arm_ptr(exynos4412_pmu_data),
  97         }, {
  98                 .compatible = "samsung,exynos5250-pmu",
  99                 .data = exynos_pmu_data_arm_ptr(exynos5250_pmu_data),
 100         }, {
 101                 .compatible = "samsung,exynos5420-pmu",
 102                 .data = exynos_pmu_data_arm_ptr(exynos5420_pmu_data),
 103         }, {
 104                 .compatible = "samsung,exynos5433-pmu",
 105         },
 106         { /*sentinel*/ },
 107 };
 108
 109 struct regmap *exynos_get_pmu_regmap(void)
 110 {
 111         struct device_node *np = of_find_matching_node(NULL,
 112                                                       exynos_pmu_of_device_ids);
 113         if (np)
 114                 return syscon_node_to_regmap(np);
 115         return ERR_PTR(-ENODEV);
 116 }
 117 EXPORT_SYMBOL_GPL(exynos_get_pmu_regmap);
 118
 119 static int exynos_pmu_probe(struct platform_device *pdev)
 120 {
 121         struct device *dev = &pdev->dev;
 122         struct resource *res;
 123
 124         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 125         pmu_base_addr = devm_ioremap_resource(dev, res);
 126         if (IS_ERR(pmu_base_addr))
 127                 return PTR_ERR(pmu_base_addr);
 128
 129         pmu_context = devm_kzalloc(&pdev->dev,
 130                         sizeof(struct exynos_pmu_context),
 131                         GFP_KERNEL);
 132         if (!pmu_context)
 133                 return -ENOMEM;
 134         pmu_context->dev = dev;
 135         pmu_context->pmu_data = of_device_get_match_data(dev);
 136
 137         if (pmu_context->pmu_data && pmu_context->pmu_data->pmu_init)
 138                 pmu_context->pmu_data->pmu_init();
 139
 140         platform_set_drvdata(pdev, pmu_context);
 141
 142         dev_dbg(dev, "Exynos PMU Driver probe done\n");
 143         return 0;
 144 }
 145
 146 static struct platform_driver exynos_pmu_driver = {
 147         .driver  = {
 148                 .name   = "exynos-pmu",
 149                 .of_match_table = exynos_pmu_of_device_ids,
 150         },
 151         .probe = exynos_pmu_probe,
 152 };
 153
 154 static int __init exynos_pmu_init(void)
 155 {
 156         return platform_driver_register(&exynos_pmu_driver);
 157
 158 }
 159 postcore_initcall(exynos_pmu_init);