Commit | Line | Data |
---|---|---|
87d68730 DA |
1 | /* |
2 | * System Control Driver | |
3 | * | |
4 | * Copyright (C) 2012 Freescale Semiconductor, Inc. | |
5 | * Copyright (C) 2012 Linaro Ltd. | |
6 | * | |
7 | * Author: Dong Aisheng <dong.aisheng@linaro.org> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | */ | |
14 | ||
15 | #include <linux/err.h> | |
16 | #include <linux/io.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/of.h> | |
19 | #include <linux/of_address.h> | |
20 | #include <linux/of_platform.h> | |
21 | #include <linux/platform_device.h> | |
22 | #include <linux/regmap.h> | |
75177dee | 23 | #include <linux/mfd/syscon.h> |
87d68730 DA |
24 | |
25 | static struct platform_driver syscon_driver; | |
26 | ||
27 | struct syscon { | |
28 | struct device *dev; | |
29 | void __iomem *base; | |
30 | struct regmap *regmap; | |
31 | }; | |
32 | ||
33 | static int syscon_match(struct device *dev, void *data) | |
34 | { | |
35 | struct syscon *syscon = dev_get_drvdata(dev); | |
36 | struct device_node *dn = data; | |
37 | ||
38 | return (syscon->dev->of_node == dn) ? 1 : 0; | |
39 | } | |
40 | ||
41 | struct regmap *syscon_node_to_regmap(struct device_node *np) | |
42 | { | |
43 | struct syscon *syscon; | |
44 | struct device *dev; | |
45 | ||
46 | dev = driver_find_device(&syscon_driver.driver, NULL, np, | |
47 | syscon_match); | |
48 | if (!dev) | |
49 | return ERR_PTR(-EPROBE_DEFER); | |
50 | ||
51 | syscon = dev_get_drvdata(dev); | |
52 | ||
53 | return syscon->regmap; | |
54 | } | |
55 | EXPORT_SYMBOL_GPL(syscon_node_to_regmap); | |
56 | ||
57 | struct regmap *syscon_regmap_lookup_by_compatible(const char *s) | |
58 | { | |
59 | struct device_node *syscon_np; | |
60 | struct regmap *regmap; | |
61 | ||
62 | syscon_np = of_find_compatible_node(NULL, NULL, s); | |
63 | if (!syscon_np) | |
64 | return ERR_PTR(-ENODEV); | |
65 | ||
66 | regmap = syscon_node_to_regmap(syscon_np); | |
67 | of_node_put(syscon_np); | |
68 | ||
69 | return regmap; | |
70 | } | |
71 | EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_compatible); | |
72 | ||
73 | struct regmap *syscon_regmap_lookup_by_phandle(struct device_node *np, | |
74 | const char *property) | |
75 | { | |
76 | struct device_node *syscon_np; | |
77 | struct regmap *regmap; | |
78 | ||
79 | syscon_np = of_parse_phandle(np, property, 0); | |
80 | if (!syscon_np) | |
81 | return ERR_PTR(-ENODEV); | |
82 | ||
83 | regmap = syscon_node_to_regmap(syscon_np); | |
84 | of_node_put(syscon_np); | |
85 | ||
86 | return regmap; | |
87 | } | |
88 | EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_phandle); | |
89 | ||
90 | static const struct of_device_id of_syscon_match[] = { | |
91 | { .compatible = "syscon", }, | |
92 | { }, | |
93 | }; | |
94 | ||
95 | static struct regmap_config syscon_regmap_config = { | |
96 | .reg_bits = 32, | |
97 | .val_bits = 32, | |
98 | .reg_stride = 4, | |
99 | }; | |
100 | ||
f791be49 | 101 | static int syscon_probe(struct platform_device *pdev) |
87d68730 DA |
102 | { |
103 | struct device *dev = &pdev->dev; | |
104 | struct device_node *np = dev->of_node; | |
105 | struct syscon *syscon; | |
106 | struct resource res; | |
107 | int ret; | |
108 | ||
109 | if (!np) | |
110 | return -ENOENT; | |
111 | ||
112 | syscon = devm_kzalloc(dev, sizeof(struct syscon), | |
113 | GFP_KERNEL); | |
114 | if (!syscon) | |
115 | return -ENOMEM; | |
116 | ||
117 | syscon->base = of_iomap(np, 0); | |
118 | if (!syscon->base) | |
119 | return -EADDRNOTAVAIL; | |
120 | ||
121 | ret = of_address_to_resource(np, 0, &res); | |
122 | if (ret) | |
123 | return ret; | |
124 | ||
125 | syscon_regmap_config.max_register = res.end - res.start - 3; | |
126 | syscon->regmap = devm_regmap_init_mmio(dev, syscon->base, | |
127 | &syscon_regmap_config); | |
128 | if (IS_ERR(syscon->regmap)) { | |
129 | dev_err(dev, "regmap init failed\n"); | |
130 | return PTR_ERR(syscon->regmap); | |
131 | } | |
132 | ||
133 | syscon->dev = dev; | |
134 | platform_set_drvdata(pdev, syscon); | |
135 | ||
136 | dev_info(dev, "syscon regmap start 0x%x end 0x%x registered\n", | |
137 | res.start, res.end); | |
138 | ||
139 | return 0; | |
140 | } | |
141 | ||
4740f73f | 142 | static int syscon_remove(struct platform_device *pdev) |
87d68730 DA |
143 | { |
144 | struct syscon *syscon; | |
145 | ||
146 | syscon = platform_get_drvdata(pdev); | |
147 | iounmap(syscon->base); | |
148 | platform_set_drvdata(pdev, NULL); | |
149 | ||
150 | return 0; | |
151 | } | |
152 | ||
153 | static struct platform_driver syscon_driver = { | |
154 | .driver = { | |
155 | .name = "syscon", | |
156 | .owner = THIS_MODULE, | |
157 | .of_match_table = of_syscon_match, | |
158 | }, | |
159 | .probe = syscon_probe, | |
84449216 | 160 | .remove = syscon_remove, |
87d68730 DA |
161 | }; |
162 | ||
163 | static int __init syscon_init(void) | |
164 | { | |
165 | return platform_driver_register(&syscon_driver); | |
166 | } | |
167 | postcore_initcall(syscon_init); | |
168 | ||
169 | static void __exit syscon_exit(void) | |
170 | { | |
171 | platform_driver_unregister(&syscon_driver); | |
172 | } | |
173 | module_exit(syscon_exit); | |
174 | ||
175 | MODULE_AUTHOR("Dong Aisheng <dong.aisheng@linaro.org>"); | |
176 | MODULE_DESCRIPTION("System Control driver"); | |
177 | MODULE_LICENSE("GPL v2"); |