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
pmu_raw_writel(u32 val,u32 offset)28 void pmu_raw_writel(u32 val, u32 offset)
29 {
30 writel_relaxed(val, pmu_base_addr + offset);
31 }
32
pmu_raw_readl(u32 offset)33 u32 pmu_raw_readl(u32 offset)
34 {
35 return readl_relaxed(pmu_base_addr + offset);
36 }
37
exynos_sys_powerdown_conf(enum sys_powerdown mode)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
exynos_get_pmu_regmap(void)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
exynos_pmu_probe(struct platform_device * pdev)110 static int exynos_pmu_probe(struct platform_device *pdev)
111 {
112 struct device *dev = &pdev->dev;
113 struct resource *res;
114
115 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
116 pmu_base_addr = devm_ioremap_resource(dev, res);
117 if (IS_ERR(pmu_base_addr))
118 return PTR_ERR(pmu_base_addr);
119
120 pmu_context = devm_kzalloc(&pdev->dev,
121 sizeof(struct exynos_pmu_context),
122 GFP_KERNEL);
123 if (!pmu_context)
124 return -ENOMEM;
125 pmu_context->dev = dev;
126 pmu_context->pmu_data = of_device_get_match_data(dev);
127
128 if (pmu_context->pmu_data && pmu_context->pmu_data->pmu_init)
129 pmu_context->pmu_data->pmu_init();
130
131 platform_set_drvdata(pdev, pmu_context);
132
133 if (devm_of_platform_populate(dev))
134 dev_err(dev, "Error populating children, reboot and poweroff might not work properly\n");
135
136 dev_dbg(dev, "Exynos PMU Driver probe done\n");
137 return 0;
138 }
139
140 static struct platform_driver exynos_pmu_driver = {
141 .driver = {
142 .name = "exynos-pmu",
143 .of_match_table = exynos_pmu_of_device_ids,
144 },
145 .probe = exynos_pmu_probe,
146 };
147
exynos_pmu_init(void)148 static int __init exynos_pmu_init(void)
149 {
150 return platform_driver_register(&exynos_pmu_driver);
151
152 }
153 postcore_initcall(exynos_pmu_init);
154
