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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 { | |
87d68730 DA |
28 | struct regmap *regmap; |
29 | }; | |
30 | ||
5ab3a89a | 31 | static int syscon_match_node(struct device *dev, void *data) |
87d68730 | 32 | { |
87d68730 DA |
33 | struct device_node *dn = data; |
34 | ||
ed21465a | 35 | return (dev->of_node == dn) ? 1 : 0; |
87d68730 DA |
36 | } |
37 | ||
38 | struct regmap *syscon_node_to_regmap(struct device_node *np) | |
39 | { | |
40 | struct syscon *syscon; | |
41 | struct device *dev; | |
42 | ||
43 | dev = driver_find_device(&syscon_driver.driver, NULL, np, | |
5ab3a89a | 44 | syscon_match_node); |
87d68730 DA |
45 | if (!dev) |
46 | return ERR_PTR(-EPROBE_DEFER); | |
47 | ||
48 | syscon = dev_get_drvdata(dev); | |
49 | ||
50 | return syscon->regmap; | |
51 | } | |
52 | EXPORT_SYMBOL_GPL(syscon_node_to_regmap); | |
53 | ||
54 | struct regmap *syscon_regmap_lookup_by_compatible(const char *s) | |
55 | { | |
56 | struct device_node *syscon_np; | |
57 | struct regmap *regmap; | |
58 | ||
59 | syscon_np = of_find_compatible_node(NULL, NULL, s); | |
60 | if (!syscon_np) | |
61 | return ERR_PTR(-ENODEV); | |
62 | ||
63 | regmap = syscon_node_to_regmap(syscon_np); | |
64 | of_node_put(syscon_np); | |
65 | ||
66 | return regmap; | |
67 | } | |
68 | EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_compatible); | |
69 | ||
5ab3a89a AS |
70 | static int syscon_match_pdevname(struct device *dev, void *data) |
71 | { | |
5ab3a89a AS |
72 | return !strcmp(dev_name(dev), (const char *)data); |
73 | } | |
74 | ||
75 | struct regmap *syscon_regmap_lookup_by_pdevname(const char *s) | |
76 | { | |
77 | struct device *dev; | |
78 | struct syscon *syscon; | |
79 | ||
80 | dev = driver_find_device(&syscon_driver.driver, NULL, (void *)s, | |
81 | syscon_match_pdevname); | |
82 | if (!dev) | |
83 | return ERR_PTR(-EPROBE_DEFER); | |
84 | ||
85 | syscon = dev_get_drvdata(dev); | |
86 | ||
87 | return syscon->regmap; | |
88 | } | |
89 | EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_pdevname); | |
90 | ||
87d68730 DA |
91 | struct regmap *syscon_regmap_lookup_by_phandle(struct device_node *np, |
92 | const char *property) | |
93 | { | |
94 | struct device_node *syscon_np; | |
95 | struct regmap *regmap; | |
96 | ||
97 | syscon_np = of_parse_phandle(np, property, 0); | |
98 | if (!syscon_np) | |
99 | return ERR_PTR(-ENODEV); | |
100 | ||
101 | regmap = syscon_node_to_regmap(syscon_np); | |
102 | of_node_put(syscon_np); | |
103 | ||
104 | return regmap; | |
105 | } | |
106 | EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_phandle); | |
107 | ||
108 | static const struct of_device_id of_syscon_match[] = { | |
109 | { .compatible = "syscon", }, | |
110 | { }, | |
111 | }; | |
112 | ||
113 | static struct regmap_config syscon_regmap_config = { | |
114 | .reg_bits = 32, | |
115 | .val_bits = 32, | |
116 | .reg_stride = 4, | |
117 | }; | |
118 | ||
f791be49 | 119 | static int syscon_probe(struct platform_device *pdev) |
87d68730 DA |
120 | { |
121 | struct device *dev = &pdev->dev; | |
87d68730 | 122 | struct syscon *syscon; |
5ab3a89a | 123 | struct resource *res; |
f10111cc | 124 | void __iomem *base; |
87d68730 | 125 | |
5ab3a89a | 126 | syscon = devm_kzalloc(dev, sizeof(*syscon), GFP_KERNEL); |
87d68730 DA |
127 | if (!syscon) |
128 | return -ENOMEM; | |
129 | ||
5ab3a89a AS |
130 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
131 | if (!res) | |
132 | return -ENOENT; | |
87d68730 | 133 | |
f10111cc AS |
134 | base = devm_ioremap(dev, res->start, resource_size(res)); |
135 | if (!base) | |
5ab3a89a | 136 | return -ENOMEM; |
87d68730 | 137 | |
5ab3a89a | 138 | syscon_regmap_config.max_register = res->end - res->start - 3; |
f10111cc | 139 | syscon->regmap = devm_regmap_init_mmio(dev, base, |
87d68730 DA |
140 | &syscon_regmap_config); |
141 | if (IS_ERR(syscon->regmap)) { | |
142 | dev_err(dev, "regmap init failed\n"); | |
143 | return PTR_ERR(syscon->regmap); | |
144 | } | |
145 | ||
87d68730 DA |
146 | platform_set_drvdata(pdev, syscon); |
147 | ||
38d8974e | 148 | dev_dbg(dev, "regmap %pR registered\n", res); |
87d68730 DA |
149 | |
150 | return 0; | |
151 | } | |
152 | ||
5ab3a89a AS |
153 | static const struct platform_device_id syscon_ids[] = { |
154 | { "syscon", }, | |
155 | { } | |
156 | }; | |
87d68730 DA |
157 | |
158 | static struct platform_driver syscon_driver = { | |
159 | .driver = { | |
160 | .name = "syscon", | |
161 | .owner = THIS_MODULE, | |
162 | .of_match_table = of_syscon_match, | |
163 | }, | |
164 | .probe = syscon_probe, | |
5ab3a89a | 165 | .id_table = syscon_ids, |
87d68730 DA |
166 | }; |
167 | ||
168 | static int __init syscon_init(void) | |
169 | { | |
170 | return platform_driver_register(&syscon_driver); | |
171 | } | |
172 | postcore_initcall(syscon_init); | |
173 | ||
174 | static void __exit syscon_exit(void) | |
175 | { | |
176 | platform_driver_unregister(&syscon_driver); | |
177 | } | |
178 | module_exit(syscon_exit); | |
179 | ||
180 | MODULE_AUTHOR("Dong Aisheng <dong.aisheng@linaro.org>"); | |
181 | MODULE_DESCRIPTION("System Control driver"); | |
182 | MODULE_LICENSE("GPL v2"); |