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); 151