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)
  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  * 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 = &exynos3250_pmu_data,
  78         }, {
  79                 .compatible = "samsung,exynos4210-pmu",
  80                 .data = &exynos4210_pmu_data,
  81         }, {
  82                 .compatible = "samsung,exynos4212-pmu",
  83                 .data = &exynos4212_pmu_data,
  84         }, {
  85                 .compatible = "samsung,exynos4412-pmu",
  86                 .data = &exynos4412_pmu_data,
  87         }, {
  88                 .compatible = "samsung,exynos5250-pmu",
  89                 .data = &exynos5250_pmu_data,
  90         }, {
  91                 .compatible = "samsung,exynos5420-pmu",
  92                 .data = &exynos5420_pmu_data,
  93         },
  94         { /*sentinel*/ },
  95 };
  96
  97 struct regmap *exynos_get_pmu_regmap(void)
  98 {
  99         struct device_node *np = of_find_matching_node(NULL,
 100                                                       exynos_pmu_of_device_ids);
 101         if (np)
 102                 return syscon_node_to_regmap(np);
 103         return ERR_PTR(-ENODEV);
 104 }
 105 EXPORT_SYMBOL_GPL(exynos_get_pmu_regmap);
 106
 107 static int exynos_pmu_probe(struct platform_device *pdev)
 108 {
 109         struct device *dev = &pdev->dev;
 110         struct resource *res;
 111
 112         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 113         pmu_base_addr = devm_ioremap_resource(dev, res);
 114         if (IS_ERR(pmu_base_addr))
 115                 return PTR_ERR(pmu_base_addr);
 116
 117         pmu_context = devm_kzalloc(&pdev->dev,
 118                         sizeof(struct exynos_pmu_context),
 119                         GFP_KERNEL);
 120         if (!pmu_context)
 121                 return -ENOMEM;
 122         pmu_context->dev = dev;
 123         pmu_context->pmu_data = of_device_get_match_data(dev);
 124
 125         if (pmu_context->pmu_data->pmu_init)
 126                 pmu_context->pmu_data->pmu_init();
 127
 128         platform_set_drvdata(pdev, pmu_context);
 129
 130         dev_dbg(dev, "Exynos PMU Driver probe done\n");
 131         return 0;
 132 }
 133
 134 static struct platform_driver exynos_pmu_driver = {
 135         .driver  = {
 136                 .name   = "exynos-pmu",
 137                 .of_match_table = exynos_pmu_of_device_ids,
 138         },
 139         .probe = exynos_pmu_probe,
 140 };
 141
 142 static int __init exynos_pmu_init(void)
 143 {
 144         return platform_driver_register(&exynos_pmu_driver);
 145
 146 }
 147 postcore_initcall(exynos_pmu_init);