1 // SPDX-License-Identifier: GPL-2.0 2 // 3 // Copyright (c) 2011-2014 Samsung Electronics Co., Ltd. 4 // http://www.samsung.com/ 5 // 6 // Exynos - CPU PMU(Power Management Unit) support 7 8 #include <linux/of.h> 9 #include <linux/of_address.h> 10 #include <linux/of_device.h> 11 #include <linux/mfd/syscon.h> 12 #include <linux/platform_device.h> 13 #include <linux/delay.h> 14 15 #include <linux/soc/samsung/exynos-regs-pmu.h> 16 #include <linux/soc/samsung/exynos-pmu.h> 17 18 #include "exynos-pmu.h" 19 20 struct exynos_pmu_context { 21 struct device *dev; 22 const struct exynos_pmu_data *pmu_data; 23 }; 24 25 void __iomem *pmu_base_addr; 26 static struct exynos_pmu_context *pmu_context; 27 28 void pmu_raw_writel(u32 val, u32 offset) 29 { 30 writel_relaxed(val, pmu_base_addr + offset); 31 } 32 33 u32 pmu_raw_readl(u32 offset) 34 { 35 return readl_relaxed(pmu_base_addr + offset); 36 } 37 38 void exynos_sys_powerdown_conf(enum sys_powerdown mode) 39 { 40 unsigned int i; 41 const struct exynos_pmu_data *pmu_data; 42 43 if (!pmu_context || !pmu_context->pmu_data) 44 return; 45 46 pmu_data = pmu_context->pmu_data; 47 48 if (pmu_data->powerdown_conf) 49 pmu_data->powerdown_conf(mode); 50 51 if (pmu_data->pmu_config) { 52 for (i = 0; (pmu_data->pmu_config[i].offset != PMU_TABLE_END); i++) 53 pmu_raw_writel(pmu_data->pmu_config[i].val[mode], 54 pmu_data->pmu_config[i].offset); 55 } 56 57 if (pmu_data->powerdown_conf_extra) 58 pmu_data->powerdown_conf_extra(mode); 59 } 60 61 /* 62 * Split the data between ARM architectures because it is relatively big 63 * and useless on other arch. 64 */ 65 #ifdef CONFIG_EXYNOS_PMU_ARM_DRIVERS 66 #define exynos_pmu_data_arm_ptr(data) (&data) 67 #else 68 #define exynos_pmu_data_arm_ptr(data) NULL 69 #endif 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 = exynos_pmu_data_arm_ptr(exynos3250_pmu_data), 78 }, { 79 .compatible = "samsung,exynos4210-pmu", 80 .data = exynos_pmu_data_arm_ptr(exynos4210_pmu_data), 81 }, { 82 .compatible = "samsung,exynos4412-pmu", 83 .data = exynos_pmu_data_arm_ptr(exynos4412_pmu_data), 84 }, { 85 .compatible = "samsung,exynos5250-pmu", 86 .data = exynos_pmu_data_arm_ptr(exynos5250_pmu_data), 87 }, { 88 .compatible = "samsung,exynos5410-pmu", 89 }, { 90 .compatible = "samsung,exynos5420-pmu", 91 .data = exynos_pmu_data_arm_ptr(exynos5420_pmu_data), 92 }, { 93 .compatible = "samsung,exynos5433-pmu", 94 }, { 95 .compatible = "samsung,exynos7-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; 113 114 pmu_base_addr = devm_platform_ioremap_resource(pdev, 0); 115 if (IS_ERR(pmu_base_addr)) 116 return PTR_ERR(pmu_base_addr); 117 118 pmu_context = devm_kzalloc(&pdev->dev, 119 sizeof(struct exynos_pmu_context), 120 GFP_KERNEL); 121 if (!pmu_context) 122 return -ENOMEM; 123 pmu_context->dev = dev; 124 pmu_context->pmu_data = of_device_get_match_data(dev); 125 126 if (pmu_context->pmu_data && pmu_context->pmu_data->pmu_init) 127 pmu_context->pmu_data->pmu_init(); 128 129 platform_set_drvdata(pdev, pmu_context); 130 131 if (devm_of_platform_populate(dev)) 132 dev_err(dev, "Error populating children, reboot and poweroff might not work properly\n"); 133 134 dev_dbg(dev, "Exynos PMU Driver probe done\n"); 135 return 0; 136 } 137 138 static struct platform_driver exynos_pmu_driver = { 139 .driver = { 140 .name = "exynos-pmu", 141 .of_match_table = exynos_pmu_of_device_ids, 142 }, 143 .probe = exynos_pmu_probe, 144 }; 145 146 static int __init exynos_pmu_init(void) 147 { 148 return platform_driver_register(&exynos_pmu_driver); 149 150 } 151 postcore_initcall(exynos_pmu_init); 152