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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 | void __iomem *base; |
29 | struct regmap *regmap; | |
30 | }; | |
31 | ||
5ab3a89a | 32 | static int syscon_match_node(struct device *dev, void *data) |
87d68730 | 33 | { |
87d68730 DA |
34 | struct device_node *dn = data; |
35 | ||
ed21465a | 36 | return (dev->of_node == dn) ? 1 : 0; |
87d68730 DA |
37 | } |
38 | ||
39 | struct regmap *syscon_node_to_regmap(struct device_node *np) | |
40 | { | |
41 | struct syscon *syscon; | |
42 | struct device *dev; | |
43 | ||
44 | dev = driver_find_device(&syscon_driver.driver, NULL, np, | |
5ab3a89a | 45 | syscon_match_node); |
87d68730 DA |
46 | if (!dev) |
47 | return ERR_PTR(-EPROBE_DEFER); | |
48 | ||
49 | syscon = dev_get_drvdata(dev); | |
50 | ||
51 | return syscon->regmap; | |
52 | } | |
53 | EXPORT_SYMBOL_GPL(syscon_node_to_regmap); | |
54 | ||
55 | struct regmap *syscon_regmap_lookup_by_compatible(const char *s) | |
56 | { | |
57 | struct device_node *syscon_np; | |
58 | struct regmap *regmap; | |
59 | ||
60 | syscon_np = of_find_compatible_node(NULL, NULL, s); | |
61 | if (!syscon_np) | |
62 | return ERR_PTR(-ENODEV); | |
63 | ||
64 | regmap = syscon_node_to_regmap(syscon_np); | |
65 | of_node_put(syscon_np); | |
66 | ||
67 | return regmap; | |
68 | } | |
69 | EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_compatible); | |
70 | ||
5ab3a89a AS |
71 | static int syscon_match_pdevname(struct device *dev, void *data) |
72 | { | |
73 | struct platform_device *pdev = to_platform_device(dev); | |
74 | const struct platform_device_id *id = platform_get_device_id(pdev); | |
75 | ||
76 | if (id) | |
77 | if (!strcmp(id->name, (const char *)data)) | |
78 | return 1; | |
79 | ||
80 | return !strcmp(dev_name(dev), (const char *)data); | |
81 | } | |
82 | ||
83 | struct regmap *syscon_regmap_lookup_by_pdevname(const char *s) | |
84 | { | |
85 | struct device *dev; | |
86 | struct syscon *syscon; | |
87 | ||
88 | dev = driver_find_device(&syscon_driver.driver, NULL, (void *)s, | |
89 | syscon_match_pdevname); | |
90 | if (!dev) | |
91 | return ERR_PTR(-EPROBE_DEFER); | |
92 | ||
93 | syscon = dev_get_drvdata(dev); | |
94 | ||
95 | return syscon->regmap; | |
96 | } | |
97 | EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_pdevname); | |
98 | ||
87d68730 DA |
99 | struct regmap *syscon_regmap_lookup_by_phandle(struct device_node *np, |
100 | const char *property) | |
101 | { | |
102 | struct device_node *syscon_np; | |
103 | struct regmap *regmap; | |
104 | ||
105 | syscon_np = of_parse_phandle(np, property, 0); | |
106 | if (!syscon_np) | |
107 | return ERR_PTR(-ENODEV); | |
108 | ||
109 | regmap = syscon_node_to_regmap(syscon_np); | |
110 | of_node_put(syscon_np); | |
111 | ||
112 | return regmap; | |
113 | } | |
114 | EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_phandle); | |
115 | ||
116 | static const struct of_device_id of_syscon_match[] = { | |
117 | { .compatible = "syscon", }, | |
118 | { }, | |
119 | }; | |
120 | ||
121 | static struct regmap_config syscon_regmap_config = { | |
122 | .reg_bits = 32, | |
123 | .val_bits = 32, | |
124 | .reg_stride = 4, | |
125 | }; | |
126 | ||
f791be49 | 127 | static int syscon_probe(struct platform_device *pdev) |
87d68730 DA |
128 | { |
129 | struct device *dev = &pdev->dev; | |
87d68730 | 130 | struct syscon *syscon; |
5ab3a89a | 131 | struct resource *res; |
87d68730 | 132 | |
5ab3a89a | 133 | syscon = devm_kzalloc(dev, sizeof(*syscon), GFP_KERNEL); |
87d68730 DA |
134 | if (!syscon) |
135 | return -ENOMEM; | |
136 | ||
5ab3a89a AS |
137 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
138 | if (!res) | |
139 | return -ENOENT; | |
87d68730 | 140 | |
5ab3a89a AS |
141 | syscon->base = devm_ioremap(dev, res->start, resource_size(res)); |
142 | if (!syscon->base) | |
143 | return -ENOMEM; | |
87d68730 | 144 | |
5ab3a89a | 145 | syscon_regmap_config.max_register = res->end - res->start - 3; |
87d68730 DA |
146 | syscon->regmap = devm_regmap_init_mmio(dev, syscon->base, |
147 | &syscon_regmap_config); | |
148 | if (IS_ERR(syscon->regmap)) { | |
149 | dev_err(dev, "regmap init failed\n"); | |
150 | return PTR_ERR(syscon->regmap); | |
151 | } | |
152 | ||
87d68730 DA |
153 | platform_set_drvdata(pdev, syscon); |
154 | ||
daba96d6 | 155 | dev_info(dev, "regmap %pR registered\n", res); |
87d68730 DA |
156 | |
157 | return 0; | |
158 | } | |
159 | ||
5ab3a89a AS |
160 | static const struct platform_device_id syscon_ids[] = { |
161 | { "syscon", }, | |
162 | { } | |
163 | }; | |
87d68730 DA |
164 | |
165 | static struct platform_driver syscon_driver = { | |
166 | .driver = { | |
167 | .name = "syscon", | |
168 | .owner = THIS_MODULE, | |
169 | .of_match_table = of_syscon_match, | |
170 | }, | |
171 | .probe = syscon_probe, | |
5ab3a89a | 172 | .id_table = syscon_ids, |
87d68730 DA |
173 | }; |
174 | ||
175 | static int __init syscon_init(void) | |
176 | { | |
177 | return platform_driver_register(&syscon_driver); | |
178 | } | |
179 | postcore_initcall(syscon_init); | |
180 | ||
181 | static void __exit syscon_exit(void) | |
182 | { | |
183 | platform_driver_unregister(&syscon_driver); | |
184 | } | |
185 | module_exit(syscon_exit); | |
186 | ||
187 | MODULE_AUTHOR("Dong Aisheng <dong.aisheng@linaro.org>"); | |
188 | MODULE_DESCRIPTION("System Control driver"); | |
189 | MODULE_LICENSE("GPL v2"); |