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9a310d21 SW |
1 | /* |
2 | * Flash partitions described by the OF (or flattened) device tree | |
3 | * | |
4 | * Copyright (C) 2006 MontaVista Software Inc. | |
5 | * Author: Vitaly Wool <vwool@ru.mvista.com> | |
6 | * | |
7 | * Revised to handle newer style flash binding by: | |
8 | * Copyright (C) 2007 David Gibson, IBM Corporation. | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify it | |
11 | * under the terms of the GNU General Public License as published by the | |
12 | * Free Software Foundation; either version 2 of the License, or (at your | |
13 | * option) any later version. | |
14 | */ | |
15 | ||
16 | #include <linux/module.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/of.h> | |
19 | #include <linux/mtd/mtd.h> | |
20 | #include <linux/mtd/partitions.h> | |
21 | ||
22 | int __devinit of_mtd_parse_partitions(struct device *dev, | |
9a310d21 SW |
23 | struct device_node *node, |
24 | struct mtd_partition **pparts) | |
25 | { | |
26 | const char *partname; | |
27 | struct device_node *pp; | |
28 | int nr_parts, i; | |
29 | ||
30 | /* First count the subnodes */ | |
31 | pp = NULL; | |
32 | nr_parts = 0; | |
33 | while ((pp = of_get_next_child(node, pp))) | |
34 | nr_parts++; | |
35 | ||
36 | if (nr_parts == 0) | |
37 | return 0; | |
38 | ||
39 | *pparts = kzalloc(nr_parts * sizeof(**pparts), GFP_KERNEL); | |
40 | if (!*pparts) | |
41 | return -ENOMEM; | |
42 | ||
43 | pp = NULL; | |
44 | i = 0; | |
45 | while ((pp = of_get_next_child(node, pp))) { | |
46 | const u32 *reg; | |
47 | int len; | |
48 | ||
ebd5a74d BK |
49 | reg = of_get_property(pp, "reg", &len); |
50 | if (!reg) { | |
4b08e149 BK |
51 | nr_parts--; |
52 | continue; | |
53 | } | |
54 | ||
9a310d21 SW |
55 | (*pparts)[i].offset = reg[0]; |
56 | (*pparts)[i].size = reg[1]; | |
57 | ||
58 | partname = of_get_property(pp, "label", &len); | |
59 | if (!partname) | |
60 | partname = of_get_property(pp, "name", &len); | |
61 | (*pparts)[i].name = (char *)partname; | |
62 | ||
63 | if (of_get_property(pp, "read-only", &len)) | |
64 | (*pparts)[i].mask_flags = MTD_WRITEABLE; | |
65 | ||
66 | i++; | |
67 | } | |
68 | ||
ebd5a74d BK |
69 | if (!i) { |
70 | of_node_put(pp); | |
71 | dev_err(dev, "No valid partition found on %s\n", node->full_name); | |
72 | kfree(*pparts); | |
73 | *pparts = NULL; | |
74 | return -EINVAL; | |
75 | } | |
76 | ||
9a310d21 SW |
77 | return nr_parts; |
78 | } | |
79 | EXPORT_SYMBOL(of_mtd_parse_partitions); | |
950bcb25 AB |
80 | |
81 | MODULE_LICENSE("GPL"); |