2 * Flash partitions described by the OF (or flattened) device tree
4 * Copyright © 2006 MontaVista Software Inc.
5 * Author: Vitaly Wool <vwool@ru.mvista.com>
7 * Revised to handle newer style flash binding by:
8 * Copyright © 2007 David Gibson, IBM Corporation.
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.
16 #include <linux/module.h>
17 #include <linux/init.h>
19 #include <linux/mtd/mtd.h>
20 #include <linux/slab.h>
21 #include <linux/mtd/partitions.h>
23 static bool node_has_compatible(struct device_node *pp)
25 return of_get_property(pp, "compatible", NULL);
28 static int parse_ofpart_partitions(struct mtd_info *master,
29 struct mtd_partition **pparts,
30 struct mtd_part_parser_data *data)
32 struct device_node *mtd_node;
33 struct device_node *ofpart_node;
35 struct device_node *pp;
36 int nr_parts, i, ret = 0;
37 bool dedicated = true;
41 * of_node can be provided through auxiliary parser data or (preferred)
42 * by assigning the master device node
44 mtd_node = data && data->of_node ? data->of_node : mtd_get_of_node(master);
48 ofpart_node = of_get_child_by_name(mtd_node, "partitions");
50 pr_warn("%s: 'partitions' subnode not found on %s. Trying to parse direct subnodes as partitions.\n",
51 master->name, mtd_node->full_name);
52 ofpart_node = mtd_node;
56 /* First count the subnodes */
58 for_each_child_of_node(ofpart_node, pp) {
59 if (!dedicated && node_has_compatible(pp))
68 *pparts = kzalloc(nr_parts * sizeof(**pparts), GFP_KERNEL);
73 for_each_child_of_node(ofpart_node, pp) {
78 if (!dedicated && node_has_compatible(pp))
81 reg = of_get_property(pp, "reg", &len);
84 pr_debug("%s: ofpart partition %s (%s) missing reg property.\n",
85 master->name, pp->full_name,
94 a_cells = of_n_addr_cells(pp);
95 s_cells = of_n_size_cells(pp);
96 if (len / 4 != a_cells + s_cells) {
97 pr_debug("%s: ofpart partition %s (%s) error parsing reg property.\n",
98 master->name, pp->full_name,
103 (*pparts)[i].offset = of_read_number(reg, a_cells);
104 (*pparts)[i].size = of_read_number(reg + a_cells, s_cells);
106 partname = of_get_property(pp, "label", &len);
108 partname = of_get_property(pp, "name", &len);
109 (*pparts)[i].name = partname;
111 if (of_get_property(pp, "read-only", &len))
112 (*pparts)[i].mask_flags |= MTD_WRITEABLE;
114 if (of_get_property(pp, "lock", &len))
115 (*pparts)[i].mask_flags |= MTD_POWERUP_LOCK;
126 pr_err("%s: error parsing ofpart partition %s (%s)\n",
127 master->name, pp->full_name, mtd_node->full_name);
136 static struct mtd_part_parser ofpart_parser = {
137 .owner = THIS_MODULE,
138 .parse_fn = parse_ofpart_partitions,
142 static int parse_ofoldpart_partitions(struct mtd_info *master,
143 struct mtd_partition **pparts,
144 struct mtd_part_parser_data *data)
146 struct device_node *dp;
147 int i, plen, nr_parts;
154 * of_node can be provided through auxiliary parser data or (preferred)
155 * by assigning the master device node
157 dp = data && data->of_node ? data->of_node : mtd_get_of_node(master);
161 part = of_get_property(dp, "partitions", &plen);
163 return 0; /* No partitions found */
165 pr_warning("Device tree uses obsolete partition map binding: %s\n",
168 nr_parts = plen / sizeof(part[0]);
170 *pparts = kzalloc(nr_parts * sizeof(*(*pparts)), GFP_KERNEL);
174 names = of_get_property(dp, "partition-names", &plen);
176 for (i = 0; i < nr_parts; i++) {
177 (*pparts)[i].offset = be32_to_cpu(part->offset);
178 (*pparts)[i].size = be32_to_cpu(part->len) & ~1;
179 /* bit 0 set signifies read only partition */
180 if (be32_to_cpu(part->len) & 1)
181 (*pparts)[i].mask_flags = MTD_WRITEABLE;
183 if (names && (plen > 0)) {
184 int len = strlen(names) + 1;
186 (*pparts)[i].name = names;
190 (*pparts)[i].name = "unnamed";
199 static struct mtd_part_parser ofoldpart_parser = {
200 .owner = THIS_MODULE,
201 .parse_fn = parse_ofoldpart_partitions,
205 static int __init ofpart_parser_init(void)
207 register_mtd_parser(&ofpart_parser);
208 register_mtd_parser(&ofoldpart_parser);
212 static void __exit ofpart_parser_exit(void)
214 deregister_mtd_parser(&ofpart_parser);
215 deregister_mtd_parser(&ofoldpart_parser);
218 module_init(ofpart_parser_init);
219 module_exit(ofpart_parser_exit);
221 MODULE_LICENSE("GPL");
222 MODULE_DESCRIPTION("Parser for MTD partitioning information in device tree");
223 MODULE_AUTHOR("Vitaly Wool, David Gibson");
225 * When MTD core cannot find the requested parser, it tries to load the module
226 * with the same name. Since we provide the ofoldpart parser, we should have
227 * the corresponding alias.
229 MODULE_ALIAS("ofoldpart");