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");