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9a310d21 SW |
1 | /* |
2 | * Flash partitions described by the OF (or flattened) device tree | |
3 | * | |
a1452a37 | 4 | * Copyright © 2006 MontaVista Software Inc. |
9a310d21 SW |
5 | * Author: Vitaly Wool <vwool@ru.mvista.com> |
6 | * | |
7 | * Revised to handle newer style flash binding by: | |
a1452a37 | 8 | * Copyright © 2007 David Gibson, IBM Corporation. |
9a310d21 SW |
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> | |
5a0e3ad6 | 20 | #include <linux/slab.h> |
9a310d21 SW |
21 | #include <linux/mtd/partitions.h> |
22 | ||
23 | int __devinit of_mtd_parse_partitions(struct device *dev, | |
9a310d21 SW |
24 | struct device_node *node, |
25 | struct mtd_partition **pparts) | |
26 | { | |
27 | const char *partname; | |
28 | struct device_node *pp; | |
29 | int nr_parts, i; | |
30 | ||
31 | /* First count the subnodes */ | |
32 | pp = NULL; | |
33 | nr_parts = 0; | |
34 | while ((pp = of_get_next_child(node, pp))) | |
35 | nr_parts++; | |
36 | ||
37 | if (nr_parts == 0) | |
38 | return 0; | |
39 | ||
40 | *pparts = kzalloc(nr_parts * sizeof(**pparts), GFP_KERNEL); | |
41 | if (!*pparts) | |
42 | return -ENOMEM; | |
43 | ||
44 | pp = NULL; | |
45 | i = 0; | |
46 | while ((pp = of_get_next_child(node, pp))) { | |
766f271a | 47 | const __be32 *reg; |
9a310d21 SW |
48 | int len; |
49 | ||
ebd5a74d BK |
50 | reg = of_get_property(pp, "reg", &len); |
51 | if (!reg) { | |
4b08e149 BK |
52 | nr_parts--; |
53 | continue; | |
54 | } | |
55 | ||
766f271a IM |
56 | (*pparts)[i].offset = be32_to_cpu(reg[0]); |
57 | (*pparts)[i].size = be32_to_cpu(reg[1]); | |
9a310d21 SW |
58 | |
59 | partname = of_get_property(pp, "label", &len); | |
60 | if (!partname) | |
61 | partname = of_get_property(pp, "name", &len); | |
62 | (*pparts)[i].name = (char *)partname; | |
63 | ||
64 | if (of_get_property(pp, "read-only", &len)) | |
65 | (*pparts)[i].mask_flags = MTD_WRITEABLE; | |
66 | ||
67 | i++; | |
68 | } | |
69 | ||
ebd5a74d BK |
70 | if (!i) { |
71 | of_node_put(pp); | |
72 | dev_err(dev, "No valid partition found on %s\n", node->full_name); | |
73 | kfree(*pparts); | |
74 | *pparts = NULL; | |
75 | return -EINVAL; | |
76 | } | |
77 | ||
9a310d21 SW |
78 | return nr_parts; |
79 | } | |
80 | EXPORT_SYMBOL(of_mtd_parse_partitions); | |
950bcb25 AB |
81 | |
82 | MODULE_LICENSE("GPL"); |