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/mfd/core.h> 11 #include <linux/mfd/syscon.h> 12 #include <linux/of_platform.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 if (pmu_data->pmu_config_extra) { 62 for (i = 0; pmu_data->pmu_config_extra[i].offset != PMU_TABLE_END; i++) 63 pmu_raw_writel(pmu_data->pmu_config_extra[i].val[mode], 64 pmu_data->pmu_config_extra[i].offset); 65 } 66 } 67 68 /* 69 * Split the data between ARM architectures because it is relatively big 70 * and useless on other arch. 71 */ 72 #ifdef CONFIG_EXYNOS_PMU_ARM_DRIVERS 73 #define exynos_pmu_data_arm_ptr(data) (&data) 74 #else 75 #define exynos_pmu_data_arm_ptr(data) NULL 76 #endif 77 78 /* 79 * PMU platform driver and devicetree bindings. 80 */ 81 static const struct of_device_id exynos_pmu_of_device_ids[] = { 82 { 83 .compatible = "samsung,exynos3250-pmu", 84 .data = exynos_pmu_data_arm_ptr(exynos3250_pmu_data), 85 }, { 86 .compatible = "samsung,exynos4210-pmu", 87 .data = exynos_pmu_data_arm_ptr(exynos4210_pmu_data), 88 }, { 89 .compatible = "samsung,exynos4212-pmu", 90 .data = exynos_pmu_data_arm_ptr(exynos4212_pmu_data), 91 }, { 92 .compatible = "samsung,exynos4412-pmu", 93 .data = exynos_pmu_data_arm_ptr(exynos4412_pmu_data), 94 }, { 95 .compatible = "samsung,exynos5250-pmu", 96 .data = exynos_pmu_data_arm_ptr(exynos5250_pmu_data), 97 }, { 98 .compatible = "samsung,exynos5410-pmu", 99 }, { 100 .compatible = "samsung,exynos5420-pmu", 101 .data = exynos_pmu_data_arm_ptr(exynos5420_pmu_data), 102 }, { 103 .compatible = "samsung,exynos5433-pmu", 104 }, { 105 .compatible = "samsung,exynos7-pmu", 106 }, { 107 .compatible = "samsung,exynos850-pmu", 108 }, 109 { /*sentinel*/ }, 110 }; 111 112 static const struct mfd_cell exynos_pmu_devs[] = { 113 { .name = "exynos-clkout", }, 114 }; 115 116 struct regmap *exynos_get_pmu_regmap(void) 117 { 118 struct device_node *np = of_find_matching_node(NULL, 119 exynos_pmu_of_device_ids); 120 if (np) 121 return syscon_node_to_regmap(np); 122 return ERR_PTR(-ENODEV); 123 } 124 EXPORT_SYMBOL_GPL(exynos_get_pmu_regmap); 125 126 static int exynos_pmu_probe(struct platform_device *pdev) 127 { 128 struct device *dev = &pdev->dev; 129 int ret; 130 131 pmu_base_addr = devm_platform_ioremap_resource(pdev, 0); 132 if (IS_ERR(pmu_base_addr)) 133 return PTR_ERR(pmu_base_addr); 134 135 pmu_context = devm_kzalloc(&pdev->dev, 136 sizeof(struct exynos_pmu_context), 137 GFP_KERNEL); 138 if (!pmu_context) 139 return -ENOMEM; 140 pmu_context->dev = dev; 141 pmu_context->pmu_data = of_device_get_match_data(dev); 142 143 if (pmu_context->pmu_data && pmu_context->pmu_data->pmu_init) 144 pmu_context->pmu_data->pmu_init(); 145 146 platform_set_drvdata(pdev, pmu_context); 147 148 ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE, exynos_pmu_devs, 149 ARRAY_SIZE(exynos_pmu_devs), NULL, 0, NULL); 150 if (ret) 151 return ret; 152 153 if (devm_of_platform_populate(dev)) 154 dev_err(dev, "Error populating children, reboot and poweroff might not work properly\n"); 155 156 dev_dbg(dev, "Exynos PMU Driver probe done\n"); 157 return 0; 158 } 159 160 static struct platform_driver exynos_pmu_driver = { 161 .driver = { 162 .name = "exynos-pmu", 163 .of_match_table = exynos_pmu_of_device_ids, 164 }, 165 .probe = exynos_pmu_probe, 166 }; 167 168 static int __init exynos_pmu_init(void) 169 { 170 return platform_driver_register(&exynos_pmu_driver); 171 172 } 173 postcore_initcall(exynos_pmu_init); 174