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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> | |
29f9b6cf | 21 | #include <linux/platform_data/syscon.h> |
87d68730 DA |
22 | #include <linux/platform_device.h> |
23 | #include <linux/regmap.h> | |
75177dee | 24 | #include <linux/mfd/syscon.h> |
87d68730 DA |
25 | |
26 | static struct platform_driver syscon_driver; | |
27 | ||
28 | struct syscon { | |
87d68730 DA |
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 | { | |
5ab3a89a AS |
73 | return !strcmp(dev_name(dev), (const char *)data); |
74 | } | |
75 | ||
76 | struct regmap *syscon_regmap_lookup_by_pdevname(const char *s) | |
77 | { | |
78 | struct device *dev; | |
79 | struct syscon *syscon; | |
80 | ||
81 | dev = driver_find_device(&syscon_driver.driver, NULL, (void *)s, | |
82 | syscon_match_pdevname); | |
83 | if (!dev) | |
84 | return ERR_PTR(-EPROBE_DEFER); | |
85 | ||
86 | syscon = dev_get_drvdata(dev); | |
87 | ||
88 | return syscon->regmap; | |
89 | } | |
90 | EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_pdevname); | |
91 | ||
87d68730 DA |
92 | struct regmap *syscon_regmap_lookup_by_phandle(struct device_node *np, |
93 | const char *property) | |
94 | { | |
95 | struct device_node *syscon_np; | |
96 | struct regmap *regmap; | |
97 | ||
45330bb4 PD |
98 | if (property) |
99 | syscon_np = of_parse_phandle(np, property, 0); | |
100 | else | |
101 | syscon_np = np; | |
102 | ||
87d68730 DA |
103 | if (!syscon_np) |
104 | return ERR_PTR(-ENODEV); | |
105 | ||
106 | regmap = syscon_node_to_regmap(syscon_np); | |
107 | of_node_put(syscon_np); | |
108 | ||
109 | return regmap; | |
110 | } | |
111 | EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_phandle); | |
112 | ||
113 | static const struct of_device_id of_syscon_match[] = { | |
114 | { .compatible = "syscon", }, | |
115 | { }, | |
116 | }; | |
117 | ||
118 | static struct regmap_config syscon_regmap_config = { | |
119 | .reg_bits = 32, | |
120 | .val_bits = 32, | |
121 | .reg_stride = 4, | |
122 | }; | |
123 | ||
f791be49 | 124 | static int syscon_probe(struct platform_device *pdev) |
87d68730 DA |
125 | { |
126 | struct device *dev = &pdev->dev; | |
29f9b6cf | 127 | struct syscon_platform_data *pdata = dev_get_platdata(dev); |
87d68730 | 128 | struct syscon *syscon; |
5ab3a89a | 129 | struct resource *res; |
f10111cc | 130 | void __iomem *base; |
87d68730 | 131 | |
5ab3a89a | 132 | syscon = devm_kzalloc(dev, sizeof(*syscon), GFP_KERNEL); |
87d68730 DA |
133 | if (!syscon) |
134 | return -ENOMEM; | |
135 | ||
5ab3a89a AS |
136 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
137 | if (!res) | |
138 | return -ENOENT; | |
87d68730 | 139 | |
f10111cc AS |
140 | base = devm_ioremap(dev, res->start, resource_size(res)); |
141 | if (!base) | |
5ab3a89a | 142 | return -ENOMEM; |
87d68730 | 143 | |
5ab3a89a | 144 | syscon_regmap_config.max_register = res->end - res->start - 3; |
29f9b6cf PM |
145 | if (pdata) |
146 | syscon_regmap_config.name = pdata->label; | |
f10111cc | 147 | syscon->regmap = devm_regmap_init_mmio(dev, base, |
87d68730 DA |
148 | &syscon_regmap_config); |
149 | if (IS_ERR(syscon->regmap)) { | |
150 | dev_err(dev, "regmap init failed\n"); | |
151 | return PTR_ERR(syscon->regmap); | |
152 | } | |
153 | ||
87d68730 DA |
154 | platform_set_drvdata(pdev, syscon); |
155 | ||
38d8974e | 156 | dev_dbg(dev, "regmap %pR registered\n", res); |
87d68730 DA |
157 | |
158 | return 0; | |
159 | } | |
160 | ||
5ab3a89a AS |
161 | static const struct platform_device_id syscon_ids[] = { |
162 | { "syscon", }, | |
163 | { } | |
164 | }; | |
87d68730 DA |
165 | |
166 | static struct platform_driver syscon_driver = { | |
167 | .driver = { | |
168 | .name = "syscon", | |
169 | .owner = THIS_MODULE, | |
170 | .of_match_table = of_syscon_match, | |
171 | }, | |
172 | .probe = syscon_probe, | |
5ab3a89a | 173 | .id_table = syscon_ids, |
87d68730 DA |
174 | }; |
175 | ||
176 | static int __init syscon_init(void) | |
177 | { | |
178 | return platform_driver_register(&syscon_driver); | |
179 | } | |
180 | postcore_initcall(syscon_init); | |
181 | ||
182 | static void __exit syscon_exit(void) | |
183 | { | |
184 | platform_driver_unregister(&syscon_driver); | |
185 | } | |
186 | module_exit(syscon_exit); | |
187 | ||
188 | MODULE_AUTHOR("Dong Aisheng <dong.aisheng@linaro.org>"); | |
189 | MODULE_DESCRIPTION("System Control driver"); | |
190 | MODULE_LICENSE("GPL v2"); |