blob: d9127e2ed808eab6ddfe5835c68cfa88ef490cf0 [file] [log] [blame]
Scott Wood9a310d22008-01-15 17:54:43 -06001/*
2 * Flash partitions described by the OF (or flattened) device tree
3 *
David Woodhousea1452a32010-08-08 20:58:20 +01004 * Copyright © 2006 MontaVista Software Inc.
Scott Wood9a310d22008-01-15 17:54:43 -06005 * Author: Vitaly Wool <vwool@ru.mvista.com>
6 *
7 * Revised to handle newer style flash binding by:
David Woodhousea1452a32010-08-08 20:58:20 +01008 * Copyright © 2007 David Gibson, IBM Corporation.
Scott Wood9a310d22008-01-15 17:54:43 -06009 *
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
Dmitry Eremin-Solenikovd26c87d2011-05-29 21:32:33 +040023static int parse_ofpart_partitions(struct mtd_info *master,
24 struct mtd_partition **pparts,
25 struct mtd_part_parser_data *data)
26{
Dmitry Eremin-Solenikov628376f2011-05-30 01:05:33 +040027 struct device_node *node;
Scott Wood9a310d22008-01-15 17:54:43 -060028 const char *partname;
29 struct device_node *pp;
30 int nr_parts, i;
31
Dmitry Eremin-Solenikov628376f2011-05-30 01:05:33 +040032
33 if (!data)
34 return 0;
35
36 node = data->of_node;
37 if (!node)
38 return 0;
39
Scott Wood9a310d22008-01-15 17:54:43 -060040 /* First count the subnodes */
41 pp = NULL;
42 nr_parts = 0;
43 while ((pp = of_get_next_child(node, pp)))
44 nr_parts++;
45
46 if (nr_parts == 0)
47 return 0;
48
49 *pparts = kzalloc(nr_parts * sizeof(**pparts), GFP_KERNEL);
50 if (!*pparts)
51 return -ENOMEM;
52
53 pp = NULL;
54 i = 0;
55 while ((pp = of_get_next_child(node, pp))) {
Ian Munsie766f2712010-10-01 17:06:08 +100056 const __be32 *reg;
Scott Wood9a310d22008-01-15 17:54:43 -060057 int len;
58
Benjamin Krillebd5a742009-08-25 15:52:41 +020059 reg = of_get_property(pp, "reg", &len);
60 if (!reg) {
Benjamin Krill4b08e142009-01-23 17:18:05 +010061 nr_parts--;
62 continue;
63 }
64
Ian Munsie766f2712010-10-01 17:06:08 +100065 (*pparts)[i].offset = be32_to_cpu(reg[0]);
66 (*pparts)[i].size = be32_to_cpu(reg[1]);
Scott Wood9a310d22008-01-15 17:54:43 -060067
68 partname = of_get_property(pp, "label", &len);
69 if (!partname)
70 partname = of_get_property(pp, "name", &len);
71 (*pparts)[i].name = (char *)partname;
72
73 if (of_get_property(pp, "read-only", &len))
74 (*pparts)[i].mask_flags = MTD_WRITEABLE;
75
76 i++;
77 }
78
Benjamin Krillebd5a742009-08-25 15:52:41 +020079 if (!i) {
80 of_node_put(pp);
Dmitry Eremin-Solenikovd26c87d2011-05-29 21:32:33 +040081 pr_err("No valid partition found on %s\n", node->full_name);
Benjamin Krillebd5a742009-08-25 15:52:41 +020082 kfree(*pparts);
83 *pparts = NULL;
84 return -EINVAL;
85 }
86
Scott Wood9a310d22008-01-15 17:54:43 -060087 return nr_parts;
88}
Adrian Bunk950bcb22008-04-14 17:19:46 +030089
Dmitry Eremin-Solenikovd26c87d2011-05-29 21:32:33 +040090static struct mtd_part_parser ofpart_parser = {
91 .owner = THIS_MODULE,
92 .parse_fn = parse_ofpart_partitions,
93 .name = "ofpart",
94};
95
Dmitry Eremin-Solenikovfbcf62a2011-05-30 01:26:17 +040096static int parse_ofoldpart_partitions(struct mtd_info *master,
97 struct mtd_partition **pparts,
98 struct mtd_part_parser_data *data)
99{
100 struct device_node *dp;
101 int i, plen, nr_parts;
102 const struct {
103 __be32 offset, len;
104 } *part;
105 const char *names;
106
107 if (!data)
108 return 0;
109
110 dp = data->of_node;
111 if (!dp)
112 return 0;
113
114 part = of_get_property(dp, "partitions", &plen);
115 if (!part)
116 return 0; /* No partitions found */
117
118 pr_warning("Device tree uses obsolete partition map binding: %s\n",
119 dp->full_name);
120
121 nr_parts = plen / sizeof(part[0]);
122
123 *pparts = kzalloc(nr_parts * sizeof(*(*pparts)), GFP_KERNEL);
Sachin Kamat5a6ea4a2012-09-25 15:27:13 +0530124 if (!*pparts)
Dmitry Eremin-Solenikovfbcf62a2011-05-30 01:26:17 +0400125 return -ENOMEM;
126
127 names = of_get_property(dp, "partition-names", &plen);
128
129 for (i = 0; i < nr_parts; i++) {
130 (*pparts)[i].offset = be32_to_cpu(part->offset);
131 (*pparts)[i].size = be32_to_cpu(part->len) & ~1;
132 /* bit 0 set signifies read only partition */
133 if (be32_to_cpu(part->len) & 1)
134 (*pparts)[i].mask_flags = MTD_WRITEABLE;
135
136 if (names && (plen > 0)) {
137 int len = strlen(names) + 1;
138
139 (*pparts)[i].name = (char *)names;
140 plen -= len;
141 names += len;
142 } else {
143 (*pparts)[i].name = "unnamed";
144 }
145
146 part++;
147 }
148
149 return nr_parts;
150}
151
152static struct mtd_part_parser ofoldpart_parser = {
153 .owner = THIS_MODULE,
154 .parse_fn = parse_ofoldpart_partitions,
155 .name = "ofoldpart",
156};
157
Dmitry Eremin-Solenikovd26c87d2011-05-29 21:32:33 +0400158static int __init ofpart_parser_init(void)
159{
Dmitry Eremin-Solenikovfbcf62a2011-05-30 01:26:17 +0400160 int rc;
161 rc = register_mtd_parser(&ofpart_parser);
162 if (rc)
163 goto out;
164
165 rc = register_mtd_parser(&ofoldpart_parser);
166 if (!rc)
167 return 0;
168
169 deregister_mtd_parser(&ofoldpart_parser);
170out:
171 return rc;
Dmitry Eremin-Solenikovd26c87d2011-05-29 21:32:33 +0400172}
173
174module_init(ofpart_parser_init);
175
Adrian Bunk950bcb22008-04-14 17:19:46 +0300176MODULE_LICENSE("GPL");
Dmitry Eremin-Solenikovd6137ba2011-06-27 01:02:59 +0400177MODULE_DESCRIPTION("Parser for MTD partitioning information in device tree");
178MODULE_AUTHOR("Vitaly Wool, David Gibson");
Dmitry Eremin-Solenikov9786f6e2011-06-27 16:34:46 +0400179/*
180 * When MTD core cannot find the requested parser, it tries to load the module
181 * with the same name. Since we provide the ofoldpart parser, we should have
182 * the corresponding alias.
183 */
184MODULE_ALIAS("ofoldpart");