2 * System Control Driver
4 * Copyright (C) 2012 Freescale Semiconductor, Inc.
5 * Copyright (C) 2012 Linaro Ltd.
7 * Author: Dong Aisheng <dong.aisheng@linaro.org>
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.
15 #include <linux/err.h>
17 #include <linux/module.h>
19 #include <linux/of_address.h>
20 #include <linux/of_platform.h>
21 #include <linux/platform_data/syscon.h>
22 #include <linux/platform_device.h>
23 #include <linux/regmap.h>
24 #include <linux/mfd/syscon.h>
26 static struct platform_driver syscon_driver;
29 struct regmap *regmap;
32 static int syscon_match_node(struct device *dev, void *data)
34 struct device_node *dn = data;
36 return (dev->of_node == dn) ? 1 : 0;
39 struct regmap *syscon_node_to_regmap(struct device_node *np)
41 struct syscon *syscon;
44 dev = driver_find_device(&syscon_driver.driver, NULL, np,
47 return ERR_PTR(-EPROBE_DEFER);
49 syscon = dev_get_drvdata(dev);
51 return syscon->regmap;
53 EXPORT_SYMBOL_GPL(syscon_node_to_regmap);
55 struct regmap *syscon_regmap_lookup_by_compatible(const char *s)
57 struct device_node *syscon_np;
58 struct regmap *regmap;
60 syscon_np = of_find_compatible_node(NULL, NULL, s);
62 return ERR_PTR(-ENODEV);
64 regmap = syscon_node_to_regmap(syscon_np);
65 of_node_put(syscon_np);
69 EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_compatible);
71 static int syscon_match_pdevname(struct device *dev, void *data)
73 return !strcmp(dev_name(dev), (const char *)data);
76 struct regmap *syscon_regmap_lookup_by_pdevname(const char *s)
79 struct syscon *syscon;
81 dev = driver_find_device(&syscon_driver.driver, NULL, (void *)s,
82 syscon_match_pdevname);
84 return ERR_PTR(-EPROBE_DEFER);
86 syscon = dev_get_drvdata(dev);
88 return syscon->regmap;
90 EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_pdevname);
92 struct regmap *syscon_regmap_lookup_by_phandle(struct device_node *np,
95 struct device_node *syscon_np;
96 struct regmap *regmap;
99 syscon_np = of_parse_phandle(np, property, 0);
104 return ERR_PTR(-ENODEV);
106 regmap = syscon_node_to_regmap(syscon_np);
107 of_node_put(syscon_np);
111 EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_phandle);
113 static const struct of_device_id of_syscon_match[] = {
114 { .compatible = "syscon", },
118 static struct regmap_config syscon_regmap_config = {
124 static int syscon_probe(struct platform_device *pdev)
126 struct device *dev = &pdev->dev;
127 struct syscon_platform_data *pdata = dev_get_platdata(dev);
128 struct syscon *syscon;
129 struct resource *res;
132 syscon = devm_kzalloc(dev, sizeof(*syscon), GFP_KERNEL);
136 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
140 base = devm_ioremap(dev, res->start, resource_size(res));
144 syscon_regmap_config.max_register = res->end - res->start - 3;
146 syscon_regmap_config.name = pdata->label;
147 syscon->regmap = devm_regmap_init_mmio(dev, base,
148 &syscon_regmap_config);
149 if (IS_ERR(syscon->regmap)) {
150 dev_err(dev, "regmap init failed\n");
151 return PTR_ERR(syscon->regmap);
154 platform_set_drvdata(pdev, syscon);
156 dev_dbg(dev, "regmap %pR registered\n", res);
161 static const struct platform_device_id syscon_ids[] = {
166 static struct platform_driver syscon_driver = {
169 .owner = THIS_MODULE,
170 .of_match_table = of_syscon_match,
172 .probe = syscon_probe,
173 .id_table = syscon_ids,
176 static int __init syscon_init(void)
178 return platform_driver_register(&syscon_driver);
180 postcore_initcall(syscon_init);
182 static void __exit syscon_exit(void)
184 platform_driver_unregister(&syscon_driver);
186 module_exit(syscon_exit);
188 MODULE_AUTHOR("Dong Aisheng <dong.aisheng@linaro.org>");
189 MODULE_DESCRIPTION("System Control driver");
190 MODULE_LICENSE("GPL v2");