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(val: pmu_data->pmu_config[i].val[mode], |
55 | offset: 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(val: pmu_data->pmu_config_extra[i].val[mode], |
64 | offset: 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 | matches: exynos_pmu_of_device_ids); |
120 | if (np) |
121 | return syscon_node_to_regmap(np); |
122 | return ERR_PTR(error: -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, index: 0); |
132 | if (IS_ERR(ptr: pmu_base_addr)) |
133 | return PTR_ERR(ptr: pmu_base_addr); |
134 | |
135 | pmu_context = devm_kzalloc(dev: &pdev->dev, |
136 | size: 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, data: pmu_context); |
147 | |
148 | ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE, cells: exynos_pmu_devs, |
149 | ARRAY_SIZE(exynos_pmu_devs), NULL, irq_base: 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 | |