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Linux/drivers/mtd/ofpart.c

  1 /*
  2  * Flash partitions described by the OF (or flattened) device tree
  3  *
  4  * Copyright © 2006 MontaVista Software Inc.
  5  * Author: Vitaly Wool <vwool@ru.mvista.com>
  6  *
  7  * Revised to handle newer style flash binding by:
  8  *   Copyright © 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>
 20 #include <linux/slab.h>
 21 #include <linux/mtd/partitions.h>
 22 
 23 static bool node_has_compatible(struct device_node *pp)
 24 {
 25         return of_get_property(pp, "compatible", NULL);
 26 }
 27 
 28 static int parse_ofpart_partitions(struct mtd_info *master,
 29                                    const struct mtd_partition **pparts,
 30                                    struct mtd_part_parser_data *data)
 31 {
 32         struct mtd_partition *parts;
 33         struct device_node *mtd_node;
 34         struct device_node *ofpart_node;
 35         const char *partname;
 36         struct device_node *pp;
 37         int nr_parts, i, ret = 0;
 38         bool dedicated = true;
 39 
 40 
 41         /* Pull of_node from the master device node */
 42         mtd_node = mtd_get_of_node(master);
 43         if (!mtd_node)
 44                 return 0;
 45 
 46         ofpart_node = of_get_child_by_name(mtd_node, "partitions");
 47         if (!ofpart_node) {
 48                 /*
 49                  * We might get here even when ofpart isn't used at all (e.g.,
 50                  * when using another parser), so don't be louder than
 51                  * KERN_DEBUG
 52                  */
 53                 pr_debug("%s: 'partitions' subnode not found on %s. Trying to parse direct subnodes as partitions.\n",
 54                          master->name, mtd_node->full_name);
 55                 ofpart_node = mtd_node;
 56                 dedicated = false;
 57         } else if (!of_device_is_compatible(ofpart_node, "fixed-partitions")) {
 58                 /* The 'partitions' subnode might be used by another parser */
 59                 return 0;
 60         }
 61 
 62         /* First count the subnodes */
 63         nr_parts = 0;
 64         for_each_child_of_node(ofpart_node,  pp) {
 65                 if (!dedicated && node_has_compatible(pp))
 66                         continue;
 67 
 68                 nr_parts++;
 69         }
 70 
 71         if (nr_parts == 0)
 72                 return 0;
 73 
 74         parts = kzalloc(nr_parts * sizeof(*parts), GFP_KERNEL);
 75         if (!parts)
 76                 return -ENOMEM;
 77 
 78         i = 0;
 79         for_each_child_of_node(ofpart_node,  pp) {
 80                 const __be32 *reg;
 81                 int len;
 82                 int a_cells, s_cells;
 83 
 84                 if (!dedicated && node_has_compatible(pp))
 85                         continue;
 86 
 87                 reg = of_get_property(pp, "reg", &len);
 88                 if (!reg) {
 89                         if (dedicated) {
 90                                 pr_debug("%s: ofpart partition %s (%s) missing reg property.\n",
 91                                          master->name, pp->full_name,
 92                                          mtd_node->full_name);
 93                                 goto ofpart_fail;
 94                         } else {
 95                                 nr_parts--;
 96                                 continue;
 97                         }
 98                 }
 99 
100                 a_cells = of_n_addr_cells(pp);
101                 s_cells = of_n_size_cells(pp);
102                 if (len / 4 != a_cells + s_cells) {
103                         pr_debug("%s: ofpart partition %s (%s) error parsing reg property.\n",
104                                  master->name, pp->full_name,
105                                  mtd_node->full_name);
106                         goto ofpart_fail;
107                 }
108 
109                 parts[i].offset = of_read_number(reg, a_cells);
110                 parts[i].size = of_read_number(reg + a_cells, s_cells);
111 
112                 partname = of_get_property(pp, "label", &len);
113                 if (!partname)
114                         partname = of_get_property(pp, "name", &len);
115                 parts[i].name = partname;
116 
117                 if (of_get_property(pp, "read-only", &len))
118                         parts[i].mask_flags |= MTD_WRITEABLE;
119 
120                 if (of_get_property(pp, "lock", &len))
121                         parts[i].mask_flags |= MTD_POWERUP_LOCK;
122 
123                 i++;
124         }
125 
126         if (!nr_parts)
127                 goto ofpart_none;
128 
129         *pparts = parts;
130         return nr_parts;
131 
132 ofpart_fail:
133         pr_err("%s: error parsing ofpart partition %s (%s)\n",
134                master->name, pp->full_name, mtd_node->full_name);
135         ret = -EINVAL;
136 ofpart_none:
137         of_node_put(pp);
138         kfree(parts);
139         return ret;
140 }
141 
142 static struct mtd_part_parser ofpart_parser = {
143         .parse_fn = parse_ofpart_partitions,
144         .name = "ofpart",
145 };
146 
147 static int parse_ofoldpart_partitions(struct mtd_info *master,
148                                       const struct mtd_partition **pparts,
149                                       struct mtd_part_parser_data *data)
150 {
151         struct mtd_partition *parts;
152         struct device_node *dp;
153         int i, plen, nr_parts;
154         const struct {
155                 __be32 offset, len;
156         } *part;
157         const char *names;
158 
159         /* Pull of_node from the master device node */
160         dp = mtd_get_of_node(master);
161         if (!dp)
162                 return 0;
163 
164         part = of_get_property(dp, "partitions", &plen);
165         if (!part)
166                 return 0; /* No partitions found */
167 
168         pr_warning("Device tree uses obsolete partition map binding: %s\n",
169                         dp->full_name);
170 
171         nr_parts = plen / sizeof(part[0]);
172 
173         parts = kzalloc(nr_parts * sizeof(*parts), GFP_KERNEL);
174         if (!parts)
175                 return -ENOMEM;
176 
177         names = of_get_property(dp, "partition-names", &plen);
178 
179         for (i = 0; i < nr_parts; i++) {
180                 parts[i].offset = be32_to_cpu(part->offset);
181                 parts[i].size   = be32_to_cpu(part->len) & ~1;
182                 /* bit 0 set signifies read only partition */
183                 if (be32_to_cpu(part->len) & 1)
184                         parts[i].mask_flags = MTD_WRITEABLE;
185 
186                 if (names && (plen > 0)) {
187                         int len = strlen(names) + 1;
188 
189                         parts[i].name = names;
190                         plen -= len;
191                         names += len;
192                 } else {
193                         parts[i].name = "unnamed";
194                 }
195 
196                 part++;
197         }
198 
199         *pparts = parts;
200         return nr_parts;
201 }
202 
203 static struct mtd_part_parser ofoldpart_parser = {
204         .parse_fn = parse_ofoldpart_partitions,
205         .name = "ofoldpart",
206 };
207 
208 static int __init ofpart_parser_init(void)
209 {
210         register_mtd_parser(&ofpart_parser);
211         register_mtd_parser(&ofoldpart_parser);
212         return 0;
213 }
214 
215 static void __exit ofpart_parser_exit(void)
216 {
217         deregister_mtd_parser(&ofpart_parser);
218         deregister_mtd_parser(&ofoldpart_parser);
219 }
220 
221 module_init(ofpart_parser_init);
222 module_exit(ofpart_parser_exit);
223 
224 MODULE_LICENSE("GPL");
225 MODULE_DESCRIPTION("Parser for MTD partitioning information in device tree");
226 MODULE_AUTHOR("Vitaly Wool, David Gibson");
227 /*
228  * When MTD core cannot find the requested parser, it tries to load the module
229  * with the same name. Since we provide the ofoldpart parser, we should have
230  * the corresponding alias.
231  */
232 MODULE_ALIAS("ofoldpart");
233 

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