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/platform_device.h>
  15 #include <linux/delay.h>
  16
  17 #include <linux/soc/samsung/exynos-regs-pmu.h>
  18 #include <linux/soc/samsung/exynos-pmu.h>
  19
  20 #include "exynos-pmu.h"
  21
  22 struct exynos_pmu_context {
  23         struct device *dev;
  24         const struct exynos_pmu_data *pmu_data;
  25 };
  26
  27 void __iomem *pmu_base_addr;
  28 static struct exynos_pmu_context *pmu_context;
  29
  30 void pmu_raw_writel(u32 val, u32 offset)
  31 {
  32         writel_relaxed(val, pmu_base_addr + offset);
  33 }
  34
  35 u32 pmu_raw_readl(u32 offset)
  36 {
  37         return readl_relaxed(pmu_base_addr + offset);
  38 }
  39
  40 void exynos_sys_powerdown_conf(enum sys_powerdown mode)
  41 {
  42         unsigned int i;
  43         const struct exynos_pmu_data *pmu_data;
  44
  45         if (!pmu_context)
  46                 return;
  47
  48         pmu_data = pmu_context->pmu_data;
  49
  50         if (pmu_data->powerdown_conf)
  51                 pmu_data->powerdown_conf(mode);
  52
  53         if (pmu_data->pmu_config) {
  54                 for (i = 0; (pmu_data->pmu_config[i].offset != PMU_TABLE_END); i++)
  55                         pmu_raw_writel(pmu_data->pmu_config[i].val[mode],
  56                                         pmu_data->pmu_config[i].offset);
  57         }
  58
  59         if (pmu_data->powerdown_conf_extra)
  60                 pmu_data->powerdown_conf_extra(mode);
  61
  62         if (pmu_data->pmu_config_extra) {
  63                 for (i = 0; pmu_data->pmu_config_extra[i].offset != PMU_TABLE_END; i++)
  64                         pmu_raw_writel(pmu_data->pmu_config_extra[i].val[mode],
  65                                         pmu_data->pmu_config_extra[i].offset);
  66         }
  67 }
  68
  69 /*
  70  * PMU platform driver and devicetree bindings.
  71  */
  72 static const struct of_device_id exynos_pmu_of_device_ids[] = {
  73         {
  74                 .compatible = "samsung,exynos3250-pmu",
  75                 .data = &exynos3250_pmu_data,
  76         }, {
  77                 .compatible = "samsung,exynos4210-pmu",
  78                 .data = &exynos4210_pmu_data,
  79         }, {
  80                 .compatible = "samsung,exynos4212-pmu",
  81                 .data = &exynos4212_pmu_data,
  82         }, {
  83                 .compatible = "samsung,exynos4412-pmu",
  84                 .data = &exynos4412_pmu_data,
  85         }, {
  86                 .compatible = "samsung,exynos5250-pmu",
  87                 .data = &exynos5250_pmu_data,
  88         }, {
  89                 .compatible = "samsung,exynos5420-pmu",
  90                 .data = &exynos5420_pmu_data,
  91         },
  92         { /*sentinel*/ },
  93 };
  94
  95 static int exynos_pmu_probe(struct platform_device *pdev)
  96 {
  97         const struct of_device_id *match;
  98         struct device *dev = &pdev->dev;
  99         struct resource *res;
 100
 101         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 102         pmu_base_addr = devm_ioremap_resource(dev, res);
 103         if (IS_ERR(pmu_base_addr))
 104                 return PTR_ERR(pmu_base_addr);
 105
 106         pmu_context = devm_kzalloc(&pdev->dev,
 107                         sizeof(struct exynos_pmu_context),
 108                         GFP_KERNEL);
 109         if (!pmu_context) {
 110                 dev_err(dev, "Cannot allocate memory.\n");
 111                 return -ENOMEM;
 112         }
 113         pmu_context->dev = dev;
 114
 115         match = of_match_node(exynos_pmu_of_device_ids, dev->of_node);
 116
 117         pmu_context->pmu_data = match->data;
 118
 119         if (pmu_context->pmu_data->pmu_init)
 120                 pmu_context->pmu_data->pmu_init();
 121
 122         platform_set_drvdata(pdev, pmu_context);
 123
 124         dev_dbg(dev, "Exynos PMU Driver probe done\n");
 125         return 0;
 126 }
 127
 128 static struct platform_driver exynos_pmu_driver = {
 129         .driver  = {
 130                 .name   = "exynos-pmu",
 131                 .of_match_table = exynos_pmu_of_device_ids,
 132         },
 133         .probe = exynos_pmu_probe,
 134 };
 135
 136 static int __init exynos_pmu_init(void)
 137 {
 138         return platform_driver_register(&exynos_pmu_driver);
 139
 140 }
 141 postcore_initcall(exynos_pmu_init);