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Scott Wood9a310d22008-01-15 17:54:43 -06001/*
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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090020#include <linux/slab.h>
Scott Wood9a310d22008-01-15 17:54:43 -060021#include <linux/mtd/partitions.h>
22
23int __devinit of_mtd_parse_partitions(struct device *dev,
Scott Wood9a310d22008-01-15 17:54:43 -060024 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))) {
47 const u32 *reg;
48 int len;
49
Benjamin Krillebd5a742009-08-25 15:52:41 +020050 reg = of_get_property(pp, "reg", &len);
51 if (!reg) {
Benjamin Krill4b08e142009-01-23 17:18:05 +010052 nr_parts--;
53 continue;
54 }
55
Scott Wood9a310d22008-01-15 17:54:43 -060056 (*pparts)[i].offset = reg[0];
57 (*pparts)[i].size = reg[1];
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
Benjamin Krillebd5a742009-08-25 15:52:41 +020070 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
Scott Wood9a310d22008-01-15 17:54:43 -060078 return nr_parts;
79}
80EXPORT_SYMBOL(of_mtd_parse_partitions);
Adrian Bunk950bcb22008-04-14 17:19:46 +030081
82MODULE_LICENSE("GPL");