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/platform_device.h> 15 #include <linux/delay.h> 16 17 #include <linux/soc/samsung/exynos-regs-pmu.h> 18 #include <linux/soc/samsung/exynos-pmu.h> 19 20 #include "exynos-pmu.h" 21 22 struct exynos_pmu_context { 23 struct device *dev; 24 const struct exynos_pmu_data *pmu_data; 25 }; 26 27 void __iomem *pmu_base_addr; 28 static struct exynos_pmu_context *pmu_context; 29 30 void pmu_raw_writel(u32 val, u32 offset) 31 { 32 writel_relaxed(val, pmu_base_addr + offset); 33 } 34 35 u32 pmu_raw_readl(u32 offset) 36 { 37 return readl_relaxed(pmu_base_addr + offset); 38 } 39 40 void exynos_sys_powerdown_conf(enum sys_powerdown mode) 41 { 42 unsigned int i; 43 const struct exynos_pmu_data *pmu_data; 44 45 if (!pmu_context) 46 return; 47 48 pmu_data = pmu_context->pmu_data; 49 50 if (pmu_data->powerdown_conf) 51 pmu_data->powerdown_conf(mode); 52 53 if (pmu_data->pmu_config) { 54 for (i = 0; (pmu_data->pmu_config[i].offset != PMU_TABLE_END); i++) 55 pmu_raw_writel(pmu_data->pmu_config[i].val[mode], 56 pmu_data->pmu_config[i].offset); 57 } 58 59 if (pmu_data->powerdown_conf_extra) 60 pmu_data->powerdown_conf_extra(mode); 61 62 if (pmu_data->pmu_config_extra) { 63 for (i = 0; pmu_data->pmu_config_extra[i].offset != PMU_TABLE_END; i++) 64 pmu_raw_writel(pmu_data->pmu_config_extra[i].val[mode], 65 pmu_data->pmu_config_extra[i].offset); 66 } 67 } 68 69 /* 70 * PMU platform driver and devicetree bindings. 71 */ 72 static const struct of_device_id exynos_pmu_of_device_ids[] = { 73 { 74 .compatible = "samsung,exynos3250-pmu", 75 .data = &exynos3250_pmu_data, 76 }, { 77 .compatible = "samsung,exynos4210-pmu", 78 .data = &exynos4210_pmu_data, 79 }, { 80 .compatible = "samsung,exynos4212-pmu", 81 .data = &exynos4212_pmu_data, 82 }, { 83 .compatible = "samsung,exynos4412-pmu", 84 .data = &exynos4412_pmu_data, 85 }, { 86 .compatible = "samsung,exynos5250-pmu", 87 .data = &exynos5250_pmu_data, 88 }, { 89 .compatible = "samsung,exynos5420-pmu", 90 .data = &exynos5420_pmu_data, 91 }, 92 { /*sentinel*/ }, 93 }; 94 95 static int exynos_pmu_probe(struct platform_device *pdev) 96 { 97 const struct of_device_id *match; 98 struct device *dev = &pdev->dev; 99 struct resource *res; 100 101 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 102 pmu_base_addr = devm_ioremap_resource(dev, res); 103 if (IS_ERR(pmu_base_addr)) 104 return PTR_ERR(pmu_base_addr); 105 106 pmu_context = devm_kzalloc(&pdev->dev, 107 sizeof(struct exynos_pmu_context), 108 GFP_KERNEL); 109 if (!pmu_context) { 110 dev_err(dev, "Cannot allocate memory.\n"); 111 return -ENOMEM; 112 } 113 pmu_context->dev = dev; 114 115 match = of_match_node(exynos_pmu_of_device_ids, dev->of_node); 116 117 pmu_context->pmu_data = match->data; 118 119 if (pmu_context->pmu_data->pmu_init) 120 pmu_context->pmu_data->pmu_init(); 121 122 platform_set_drvdata(pdev, pmu_context); 123 124 dev_dbg(dev, "Exynos PMU Driver probe done\n"); 125 return 0; 126 } 127 128 static struct platform_driver exynos_pmu_driver = { 129 .driver = { 130 .name = "exynos-pmu", 131 .of_match_table = exynos_pmu_of_device_ids, 132 }, 133 .probe = exynos_pmu_probe, 134 }; 135 136 static int __init exynos_pmu_init(void) 137 { 138 return platform_driver_register(&exynos_pmu_driver); 139 140 } 141 postcore_initcall(exynos_pmu_init); 142