blob: d64f8c30945fbcd8e2d09a5b8342e75c081cd343 [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
Josh Wue79265b2013-08-05 19:14:38 +080023static bool node_has_compatible(struct device_node *pp)
24{
25 return of_get_property(pp, "compatible", NULL);
26}
27
Dmitry Eremin-Solenikovd26c87d2011-05-29 21:32:33 +040028static int parse_ofpart_partitions(struct mtd_info *master,
29 struct mtd_partition **pparts,
30 struct mtd_part_parser_data *data)
31{
Dmitry Eremin-Solenikov628376f2011-05-30 01:05:33 +040032 struct device_node *node;
Scott Wood9a310d22008-01-15 17:54:43 -060033 const char *partname;
34 struct device_node *pp;
35 int nr_parts, i;
36
Dmitry Eremin-Solenikov628376f2011-05-30 01:05:33 +040037
38 if (!data)
39 return 0;
40
41 node = data->of_node;
42 if (!node)
43 return 0;
44
Scott Wood9a310d22008-01-15 17:54:43 -060045 /* First count the subnodes */
Scott Wood9a310d22008-01-15 17:54:43 -060046 nr_parts = 0;
Wei Yongjun60ea89e2013-08-23 11:04:27 +080047 for_each_child_of_node(node, pp) {
Josh Wue79265b2013-08-05 19:14:38 +080048 if (node_has_compatible(pp))
49 continue;
50
Scott Wood9a310d22008-01-15 17:54:43 -060051 nr_parts++;
Josh Wue79265b2013-08-05 19:14:38 +080052 }
Scott Wood9a310d22008-01-15 17:54:43 -060053
54 if (nr_parts == 0)
55 return 0;
56
57 *pparts = kzalloc(nr_parts * sizeof(**pparts), GFP_KERNEL);
58 if (!*pparts)
59 return -ENOMEM;
60
Scott Wood9a310d22008-01-15 17:54:43 -060061 i = 0;
Wei Yongjun60ea89e2013-08-23 11:04:27 +080062 for_each_child_of_node(node, pp) {
Ian Munsie766f2712010-10-01 17:06:08 +100063 const __be32 *reg;
Scott Wood9a310d22008-01-15 17:54:43 -060064 int len;
Joe Schaack05ff8c22013-02-21 16:29:45 -060065 int a_cells, s_cells;
Scott Wood9a310d22008-01-15 17:54:43 -060066
Josh Wue79265b2013-08-05 19:14:38 +080067 if (node_has_compatible(pp))
68 continue;
69
Benjamin Krillebd5a742009-08-25 15:52:41 +020070 reg = of_get_property(pp, "reg", &len);
71 if (!reg) {
Benjamin Krill4b08e142009-01-23 17:18:05 +010072 nr_parts--;
73 continue;
74 }
75
Joe Schaack05ff8c22013-02-21 16:29:45 -060076 a_cells = of_n_addr_cells(pp);
77 s_cells = of_n_size_cells(pp);
78 (*pparts)[i].offset = of_read_number(reg, a_cells);
79 (*pparts)[i].size = of_read_number(reg + a_cells, s_cells);
Scott Wood9a310d22008-01-15 17:54:43 -060080
81 partname = of_get_property(pp, "label", &len);
82 if (!partname)
83 partname = of_get_property(pp, "name", &len);
84 (*pparts)[i].name = (char *)partname;
85
86 if (of_get_property(pp, "read-only", &len))
Josh Radelab0b00b2012-11-14 14:11:32 -080087 (*pparts)[i].mask_flags |= MTD_WRITEABLE;
88
89 if (of_get_property(pp, "lock", &len))
90 (*pparts)[i].mask_flags |= MTD_POWERUP_LOCK;
Scott Wood9a310d22008-01-15 17:54:43 -060091
92 i++;
93 }
94
Benjamin Krillebd5a742009-08-25 15:52:41 +020095 if (!i) {
96 of_node_put(pp);
Dmitry Eremin-Solenikovd26c87d2011-05-29 21:32:33 +040097 pr_err("No valid partition found on %s\n", node->full_name);
Benjamin Krillebd5a742009-08-25 15:52:41 +020098 kfree(*pparts);
99 *pparts = NULL;
100 return -EINVAL;
101 }
102
Scott Wood9a310d22008-01-15 17:54:43 -0600103 return nr_parts;
104}
Adrian Bunk950bcb22008-04-14 17:19:46 +0300105
Dmitry Eremin-Solenikovd26c87d2011-05-29 21:32:33 +0400106static struct mtd_part_parser ofpart_parser = {
107 .owner = THIS_MODULE,
108 .parse_fn = parse_ofpart_partitions,
109 .name = "ofpart",
110};
111
Dmitry Eremin-Solenikovfbcf62a2011-05-30 01:26:17 +0400112static int parse_ofoldpart_partitions(struct mtd_info *master,
113 struct mtd_partition **pparts,
114 struct mtd_part_parser_data *data)
115{
116 struct device_node *dp;
117 int i, plen, nr_parts;
118 const struct {
119 __be32 offset, len;
120 } *part;
121 const char *names;
122
123 if (!data)
124 return 0;
125
126 dp = data->of_node;
127 if (!dp)
128 return 0;
129
130 part = of_get_property(dp, "partitions", &plen);
131 if (!part)
132 return 0; /* No partitions found */
133
134 pr_warning("Device tree uses obsolete partition map binding: %s\n",
135 dp->full_name);
136
137 nr_parts = plen / sizeof(part[0]);
138
139 *pparts = kzalloc(nr_parts * sizeof(*(*pparts)), GFP_KERNEL);
Sachin Kamatecbcbc72012-09-25 15:27:13 +0530140 if (!*pparts)
Dmitry Eremin-Solenikovfbcf62a2011-05-30 01:26:17 +0400141 return -ENOMEM;
142
143 names = of_get_property(dp, "partition-names", &plen);
144
145 for (i = 0; i < nr_parts; i++) {
146 (*pparts)[i].offset = be32_to_cpu(part->offset);
147 (*pparts)[i].size = be32_to_cpu(part->len) & ~1;
148 /* bit 0 set signifies read only partition */
149 if (be32_to_cpu(part->len) & 1)
150 (*pparts)[i].mask_flags = MTD_WRITEABLE;
151
152 if (names && (plen > 0)) {
153 int len = strlen(names) + 1;
154
155 (*pparts)[i].name = (char *)names;
156 plen -= len;
157 names += len;
158 } else {
159 (*pparts)[i].name = "unnamed";
160 }
161
162 part++;
163 }
164
165 return nr_parts;
166}
167
168static struct mtd_part_parser ofoldpart_parser = {
169 .owner = THIS_MODULE,
170 .parse_fn = parse_ofoldpart_partitions,
171 .name = "ofoldpart",
172};
173
Dmitry Eremin-Solenikovd26c87d2011-05-29 21:32:33 +0400174static int __init ofpart_parser_init(void)
175{
Dmitry Eremin-Solenikovfbcf62a2011-05-30 01:26:17 +0400176 int rc;
177 rc = register_mtd_parser(&ofpart_parser);
178 if (rc)
179 goto out;
180
181 rc = register_mtd_parser(&ofoldpart_parser);
182 if (!rc)
183 return 0;
184
185 deregister_mtd_parser(&ofoldpart_parser);
186out:
187 return rc;
Dmitry Eremin-Solenikovd26c87d2011-05-29 21:32:33 +0400188}
189
Lubomir Rintel422f3892013-01-16 02:12:50 +0100190static void __exit ofpart_parser_exit(void)
191{
192 deregister_mtd_parser(&ofpart_parser);
193 deregister_mtd_parser(&ofoldpart_parser);
194}
195
Dmitry Eremin-Solenikovd26c87d2011-05-29 21:32:33 +0400196module_init(ofpart_parser_init);
Lubomir Rintel422f3892013-01-16 02:12:50 +0100197module_exit(ofpart_parser_exit);
Dmitry Eremin-Solenikovd26c87d2011-05-29 21:32:33 +0400198
Adrian Bunk950bcb22008-04-14 17:19:46 +0300199MODULE_LICENSE("GPL");
Dmitry Eremin-Solenikovd6137ba2011-06-27 01:02:59 +0400200MODULE_DESCRIPTION("Parser for MTD partitioning information in device tree");
201MODULE_AUTHOR("Vitaly Wool, David Gibson");
Dmitry Eremin-Solenikov9786f6e2011-06-27 16:34:46 +0400202/*
203 * When MTD core cannot find the requested parser, it tries to load the module
204 * with the same name. Since we provide the ofoldpart parser, we should have
205 * the corresponding alias.
206 */
207MODULE_ALIAS("ofoldpart");