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6e14a61d41
register_mtd_parser never fails; hence make it return void. Signed-off-by: Axel Lin <axel.lin@ingics.com> Signed-off-by: Brian Norris <computersforpeace@gmail.com>
199 lines
4.4 KiB
C
199 lines
4.4 KiB
C
/*
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* Flash partitions described by the OF (or flattened) device tree
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*
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* Copyright © 2006 MontaVista Software Inc.
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* Author: Vitaly Wool <vwool@ru.mvista.com>
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*
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* Revised to handle newer style flash binding by:
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* Copyright © 2007 David Gibson, IBM Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/of.h>
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#include <linux/mtd/mtd.h>
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#include <linux/slab.h>
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#include <linux/mtd/partitions.h>
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static bool node_has_compatible(struct device_node *pp)
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{
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return of_get_property(pp, "compatible", NULL);
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}
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static int parse_ofpart_partitions(struct mtd_info *master,
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struct mtd_partition **pparts,
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struct mtd_part_parser_data *data)
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{
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struct device_node *node;
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const char *partname;
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struct device_node *pp;
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int nr_parts, i;
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if (!data)
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return 0;
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node = data->of_node;
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if (!node)
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return 0;
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/* First count the subnodes */
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nr_parts = 0;
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for_each_child_of_node(node, pp) {
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if (node_has_compatible(pp))
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continue;
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nr_parts++;
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}
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if (nr_parts == 0)
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return 0;
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*pparts = kzalloc(nr_parts * sizeof(**pparts), GFP_KERNEL);
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if (!*pparts)
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return -ENOMEM;
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i = 0;
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for_each_child_of_node(node, pp) {
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const __be32 *reg;
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int len;
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int a_cells, s_cells;
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if (node_has_compatible(pp))
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continue;
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reg = of_get_property(pp, "reg", &len);
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if (!reg) {
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nr_parts--;
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continue;
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}
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a_cells = of_n_addr_cells(pp);
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s_cells = of_n_size_cells(pp);
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(*pparts)[i].offset = of_read_number(reg, a_cells);
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(*pparts)[i].size = of_read_number(reg + a_cells, s_cells);
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partname = of_get_property(pp, "label", &len);
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if (!partname)
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partname = of_get_property(pp, "name", &len);
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(*pparts)[i].name = partname;
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if (of_get_property(pp, "read-only", &len))
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(*pparts)[i].mask_flags |= MTD_WRITEABLE;
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if (of_get_property(pp, "lock", &len))
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(*pparts)[i].mask_flags |= MTD_POWERUP_LOCK;
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i++;
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}
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if (!i) {
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of_node_put(pp);
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pr_err("No valid partition found on %s\n", node->full_name);
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kfree(*pparts);
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*pparts = NULL;
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return -EINVAL;
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}
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return nr_parts;
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}
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static struct mtd_part_parser ofpart_parser = {
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.owner = THIS_MODULE,
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.parse_fn = parse_ofpart_partitions,
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.name = "ofpart",
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};
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static int parse_ofoldpart_partitions(struct mtd_info *master,
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struct mtd_partition **pparts,
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struct mtd_part_parser_data *data)
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{
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struct device_node *dp;
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int i, plen, nr_parts;
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const struct {
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__be32 offset, len;
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} *part;
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const char *names;
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if (!data)
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return 0;
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dp = data->of_node;
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if (!dp)
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return 0;
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part = of_get_property(dp, "partitions", &plen);
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if (!part)
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return 0; /* No partitions found */
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pr_warning("Device tree uses obsolete partition map binding: %s\n",
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dp->full_name);
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nr_parts = plen / sizeof(part[0]);
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*pparts = kzalloc(nr_parts * sizeof(*(*pparts)), GFP_KERNEL);
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if (!*pparts)
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return -ENOMEM;
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names = of_get_property(dp, "partition-names", &plen);
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for (i = 0; i < nr_parts; i++) {
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(*pparts)[i].offset = be32_to_cpu(part->offset);
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(*pparts)[i].size = be32_to_cpu(part->len) & ~1;
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/* bit 0 set signifies read only partition */
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if (be32_to_cpu(part->len) & 1)
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(*pparts)[i].mask_flags = MTD_WRITEABLE;
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if (names && (plen > 0)) {
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int len = strlen(names) + 1;
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(*pparts)[i].name = names;
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plen -= len;
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names += len;
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} else {
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(*pparts)[i].name = "unnamed";
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}
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part++;
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}
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return nr_parts;
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}
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static struct mtd_part_parser ofoldpart_parser = {
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.owner = THIS_MODULE,
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.parse_fn = parse_ofoldpart_partitions,
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.name = "ofoldpart",
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};
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static int __init ofpart_parser_init(void)
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{
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register_mtd_parser(&ofpart_parser);
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register_mtd_parser(&ofoldpart_parser);
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return 0;
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}
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static void __exit ofpart_parser_exit(void)
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{
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deregister_mtd_parser(&ofpart_parser);
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deregister_mtd_parser(&ofoldpart_parser);
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}
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module_init(ofpart_parser_init);
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module_exit(ofpart_parser_exit);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Parser for MTD partitioning information in device tree");
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MODULE_AUTHOR("Vitaly Wool, David Gibson");
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/*
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* When MTD core cannot find the requested parser, it tries to load the module
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* with the same name. Since we provide the ofoldpart parser, we should have
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* the corresponding alias.
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*/
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MODULE_ALIAS("ofoldpart");
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