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
pmu_raw_writel(u32 val,u32 offset)29 void pmu_raw_writel(u32 val, u32 offset)
30 {
31 writel_relaxed(val, pmu_base_addr + offset);
32 }
33
pmu_raw_readl(u32 offset)34 u32 pmu_raw_readl(u32 offset)
35 {
36 return readl_relaxed(pmu_base_addr + offset);
37 }
38
exynos_sys_powerdown_conf(enum sys_powerdown mode)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 .compatible = "samsung,exynos850-pmu",
99 },
100 { /*sentinel*/ },
101 };
102
103 static const struct mfd_cell exynos_pmu_devs[] = {
104 { .name = "exynos-clkout", },
105 };
106
exynos_get_pmu_regmap(void)107 struct regmap *exynos_get_pmu_regmap(void)
108 {
109 struct device_node *np = of_find_matching_node(NULL,
110 exynos_pmu_of_device_ids);
111 if (np)
112 return syscon_node_to_regmap(np);
113 return ERR_PTR(-ENODEV);
114 }
115 EXPORT_SYMBOL_GPL(exynos_get_pmu_regmap);
116
exynos_pmu_probe(struct platform_device * pdev)117 static int exynos_pmu_probe(struct platform_device *pdev)
118 {
119 struct device *dev = &pdev->dev;
120 int ret;
121
122 pmu_base_addr = devm_platform_ioremap_resource(pdev, 0);
123 if (IS_ERR(pmu_base_addr))
124 return PTR_ERR(pmu_base_addr);
125
126 pmu_context = devm_kzalloc(&pdev->dev,
127 sizeof(struct exynos_pmu_context),
128 GFP_KERNEL);
129 if (!pmu_context)
130 return -ENOMEM;
131 pmu_context->dev = dev;
132 pmu_context->pmu_data = of_device_get_match_data(dev);
133
134 if (pmu_context->pmu_data && pmu_context->pmu_data->pmu_init)
135 pmu_context->pmu_data->pmu_init();
136
137 platform_set_drvdata(pdev, pmu_context);
138
139 ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE, exynos_pmu_devs,
140 ARRAY_SIZE(exynos_pmu_devs), NULL, 0, NULL);
141 if (ret)
142 return ret;
143
144 if (devm_of_platform_populate(dev))
145 dev_err(dev, "Error populating children, reboot and poweroff might not work properly\n");
146
147 dev_dbg(dev, "Exynos PMU Driver probe done\n");
148 return 0;
149 }
150
151 static struct platform_driver exynos_pmu_driver = {
152 .driver = {
153 .name = "exynos-pmu",
154 .of_match_table = exynos_pmu_of_device_ids,
155 },
156 .probe = exynos_pmu_probe,
157 };
158
exynos_pmu_init(void)159 static int __init exynos_pmu_init(void)
160 {
161 return platform_driver_register(&exynos_pmu_driver);
162
163 }
164 postcore_initcall(exynos_pmu_init);
165