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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> |
23 | #include <linux/mfd/syscon.h> |
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 | |
101 | static int syscon_probe(struct platform_device *pdev) |
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 | |
142 | static int syscon_remove(struct platform_device *pdev) |
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, |
160 | .remove = syscon_remove, |
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"); |
178 |
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Tags:
od-2011-09-04
od-2011-09-18
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