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[karo-tx-linux.git] / drivers / soc / samsung / exynos-pmu.c
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/of_device.h>
15 #include <linux/mfd/syscon.h>
16 #include <linux/platform_device.h>
17 #include <linux/delay.h>
18
19 #include <linux/soc/samsung/exynos-regs-pmu.h>
20 #include <linux/soc/samsung/exynos-pmu.h>
21
22 #include "exynos-pmu.h"
23
24 struct exynos_pmu_context {
25         struct device *dev;
26         const struct exynos_pmu_data *pmu_data;
27 };
28
29 void __iomem *pmu_base_addr;
30 static struct exynos_pmu_context *pmu_context;
31
32 void pmu_raw_writel(u32 val, u32 offset)
33 {
34         writel_relaxed(val, pmu_base_addr + offset);
35 }
36
37 u32 pmu_raw_readl(u32 offset)
38 {
39         return readl_relaxed(pmu_base_addr + offset);
40 }
41
42 void exynos_sys_powerdown_conf(enum sys_powerdown mode)
43 {
44         unsigned int i;
45         const struct exynos_pmu_data *pmu_data;
46
47         if (!pmu_context || !pmu_context->pmu_data)
48                 return;
49
50         pmu_data = pmu_context->pmu_data;
51
52         if (pmu_data->powerdown_conf)
53                 pmu_data->powerdown_conf(mode);
54
55         if (pmu_data->pmu_config) {
56                 for (i = 0; (pmu_data->pmu_config[i].offset != PMU_TABLE_END); i++)
57                         pmu_raw_writel(pmu_data->pmu_config[i].val[mode],
58                                         pmu_data->pmu_config[i].offset);
59         }
60
61         if (pmu_data->powerdown_conf_extra)
62                 pmu_data->powerdown_conf_extra(mode);
63
64         if (pmu_data->pmu_config_extra) {
65                 for (i = 0; pmu_data->pmu_config_extra[i].offset != PMU_TABLE_END; i++)
66                         pmu_raw_writel(pmu_data->pmu_config_extra[i].val[mode],
67                                         pmu_data->pmu_config_extra[i].offset);
68         }
69 }
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 = &exynos3250_pmu_data,
78         }, {
79                 .compatible = "samsung,exynos4210-pmu",
80                 .data = &exynos4210_pmu_data,
81         }, {
82                 .compatible = "samsung,exynos4212-pmu",
83                 .data = &exynos4212_pmu_data,
84         }, {
85                 .compatible = "samsung,exynos4412-pmu",
86                 .data = &exynos4412_pmu_data,
87         }, {
88                 .compatible = "samsung,exynos5250-pmu",
89                 .data = &exynos5250_pmu_data,
90         }, {
91                 .compatible = "samsung,exynos5420-pmu",
92                 .data = &exynos5420_pmu_data,
93         }, {
94                 .compatible = "samsung,exynos5433-pmu",
95         },
96         { /*sentinel*/ },
97 };
98
99 struct regmap *exynos_get_pmu_regmap(void)
100 {
101         struct device_node *np = of_find_matching_node(NULL,
102                                                       exynos_pmu_of_device_ids);
103         if (np)
104                 return syscon_node_to_regmap(np);
105         return ERR_PTR(-ENODEV);
106 }
107 EXPORT_SYMBOL_GPL(exynos_get_pmu_regmap);
108
109 static int exynos_pmu_probe(struct platform_device *pdev)
110 {
111         struct device *dev = &pdev->dev;
112         struct resource *res;
113
114         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
115         pmu_base_addr = devm_ioremap_resource(dev, res);
116         if (IS_ERR(pmu_base_addr))
117                 return PTR_ERR(pmu_base_addr);
118
119         pmu_context = devm_kzalloc(&pdev->dev,
120                         sizeof(struct exynos_pmu_context),
121                         GFP_KERNEL);
122         if (!pmu_context)
123                 return -ENOMEM;
124         pmu_context->dev = dev;
125         pmu_context->pmu_data = of_device_get_match_data(dev);
126
127         if (pmu_context->pmu_data && pmu_context->pmu_data->pmu_init)
128                 pmu_context->pmu_data->pmu_init();
129
130         platform_set_drvdata(pdev, pmu_context);
131
132         dev_dbg(dev, "Exynos PMU Driver probe done\n");
133         return 0;
134 }
135
136 static struct platform_driver exynos_pmu_driver = {
137         .driver  = {
138                 .name   = "exynos-pmu",
139                 .of_match_table = exynos_pmu_of_device_ids,
140         },
141         .probe = exynos_pmu_probe,
142 };
143
144 static int __init exynos_pmu_init(void)
145 {
146         return platform_driver_register(&exynos_pmu_driver);
147
148 }
149 postcore_initcall(exynos_pmu_init);