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); 160