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/core.h> 12 #include <linux/mfd/syscon.h> 13 #include <linux/platform_device.h> 14 #include <linux/delay.h> 15 16 #include <linux/soc/samsung/exynos-regs-pmu.h> 17 #include <linux/soc/samsung/exynos-pmu.h> 18 19 #include "exynos-pmu.h" 20 21 struct exynos_pmu_context { 22 struct device *dev; 23 const struct exynos_pmu_data *pmu_data; 24 }; 25 26 void __iomem *pmu_base_addr; 27 static struct exynos_pmu_context *pmu_context; 28 29 void pmu_raw_writel(u32 val, u32 offset) 30 { 31 writel_relaxed(val, pmu_base_addr + offset); 32 } 33 34 u32 pmu_raw_readl(u32 offset) 35 { 36 return readl_relaxed(pmu_base_addr + offset); 37 } 38 39 void exynos_sys_powerdown_conf(enum sys_powerdown mode) 40 { 41 unsigned int i; 42 const struct exynos_pmu_data *pmu_data; 43 44 if (!pmu_context || !pmu_context->pmu_data) 45 return; 46 47 pmu_data = pmu_context->pmu_data; 48 49 if (pmu_data->powerdown_conf) 50 pmu_data->powerdown_conf(mode); 51 52 if (pmu_data->pmu_config) { 53 for (i = 0; (pmu_data->pmu_config[i].offset != PMU_TABLE_END); i++) 54 pmu_raw_writel(pmu_data->pmu_config[i].val[mode], 55 pmu_data->pmu_config[i].offset); 56 } 57 58 if (pmu_data->powerdown_conf_extra) 59 pmu_data->powerdown_conf_extra(mode); 60 } 61 62 /* 63 * Split the data between ARM architectures because it is relatively big 64 * and useless on other arch. 65 */ 66 #ifdef CONFIG_EXYNOS_PMU_ARM_DRIVERS 67 #define exynos_pmu_data_arm_ptr(data) (&data) 68 #else 69 #define exynos_pmu_data_arm_ptr(data) NULL 70 #endif 71 72 /* 73 * PMU platform driver and devicetree bindings. 74 */ 75 static const struct of_device_id exynos_pmu_of_device_ids[] = { 76 { 77 .compatible = "samsung,exynos3250-pmu", 78 .data = exynos_pmu_data_arm_ptr(exynos3250_pmu_data), 79 }, { 80 .compatible = "samsung,exynos4210-pmu", 81 .data = exynos_pmu_data_arm_ptr(exynos4210_pmu_data), 82 }, { 83 .compatible = "samsung,exynos4412-pmu", 84 .data = exynos_pmu_data_arm_ptr(exynos4412_pmu_data), 85 }, { 86 .compatible = "samsung,exynos5250-pmu", 87 .data = exynos_pmu_data_arm_ptr(exynos5250_pmu_data), 88 }, { 89 .compatible = "samsung,exynos5410-pmu", 90 }, { 91 .compatible = "samsung,exynos5420-pmu", 92 .data = exynos_pmu_data_arm_ptr(exynos5420_pmu_data), 93 }, { 94 .compatible = "samsung,exynos5433-pmu", 95 }, { 96 .compatible = "samsung,exynos7-pmu", 97 }, 98 { /*sentinel*/ }, 99 }; 100 101 static const struct mfd_cell exynos_pmu_devs[] = { 102 { .name = "exynos-clkout", }, 103 }; 104 105 struct regmap *exynos_get_pmu_regmap(void) 106 { 107 struct device_node *np = of_find_matching_node(NULL, 108 exynos_pmu_of_device_ids); 109 if (np) 110 return syscon_node_to_regmap(np); 111 return ERR_PTR(-ENODEV); 112 } 113 EXPORT_SYMBOL_GPL(exynos_get_pmu_regmap); 114 115 static int exynos_pmu_probe(struct platform_device *pdev) 116 { 117 struct device *dev = &pdev->dev; 118 int ret; 119 120 pmu_base_addr = devm_platform_ioremap_resource(pdev, 0); 121 if (IS_ERR(pmu_base_addr)) 122 return PTR_ERR(pmu_base_addr); 123 124 pmu_context = devm_kzalloc(&pdev->dev, 125 sizeof(struct exynos_pmu_context), 126 GFP_KERNEL); 127 if (!pmu_context) 128 return -ENOMEM; 129 pmu_context->dev = dev; 130 pmu_context->pmu_data = of_device_get_match_data(dev); 131 132 if (pmu_context->pmu_data && pmu_context->pmu_data->pmu_init) 133 pmu_context->pmu_data->pmu_init(); 134 135 platform_set_drvdata(pdev, pmu_context); 136 137 ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE, exynos_pmu_devs, 138 ARRAY_SIZE(exynos_pmu_devs), NULL, 0, NULL); 139 if (ret) 140 return ret; 141 142 if (devm_of_platform_populate(dev)) 143 dev_err(dev, "Error populating children, reboot and poweroff might not work properly\n"); 144 145 dev_dbg(dev, "Exynos PMU Driver probe done\n"); 146 return 0; 147 } 148 149 static struct platform_driver exynos_pmu_driver = { 150 .driver = { 151 .name = "exynos-pmu", 152 .of_match_table = exynos_pmu_of_device_ids, 153 }, 154 .probe = exynos_pmu_probe, 155 }; 156 157 static int __init exynos_pmu_init(void) 158 { 159 return platform_driver_register(&exynos_pmu_driver); 160 161 } 162 postcore_initcall(exynos_pmu_init); 163