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/*
* Flash partitions described by the OF (or flattened) device tree
*
* Copyright © 2006 MontaVista Software Inc.
* Author: Vitaly Wool <vwool@ru.mvista.com>
*
* Revised to handle newer style flash binding by:
* Copyright © 2007 David Gibson, IBM Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/of.h>
#include <linux/mtd/mtd.h>
#include <linux/slab.h>
#include <linux/mtd/partitions.h>
static int parse_ofpart_partitions(struct mtd_info *master,
struct mtd_partition **pparts,
struct mtd_part_parser_data *data)
{
struct device_node *node;
const char *partname;
struct device_node *pp;
int nr_parts, i;
if (!data)
return 0;
node = data->of_node;
if (!node)
return 0;
/* First count the subnodes */
pp = NULL;
nr_parts = 0;
while ((pp = of_get_next_child(node, pp)))
nr_parts++;
if (nr_parts == 0)
return 0;
*pparts = kzalloc(nr_parts * sizeof(**pparts), GFP_KERNEL);
if (!*pparts)
return -ENOMEM;
pp = NULL;
i = 0;
while ((pp = of_get_next_child(node, pp))) {
const __be32 *reg;
int len;
reg = of_get_property(pp, "reg", &len);
if (!reg) {
nr_parts--;
continue;
}
(*pparts)[i].offset = be32_to_cpu(reg[0]);
(*pparts)[i].size = be32_to_cpu(reg[1]);
partname = of_get_property(pp, "label", &len);
if (!partname)
partname = of_get_property(pp, "name", &len);
(*pparts)[i].name = (char *)partname;
if (of_get_property(pp, "read-only", &len))
(*pparts)[i].mask_flags = MTD_WRITEABLE;
i++;
}
if (!i) {
of_node_put(pp);
pr_err("No valid partition found on %s\n", node->full_name);
kfree(*pparts);
*pparts = NULL;
return -EINVAL;
}
return nr_parts;
}
static struct mtd_part_parser ofpart_parser = {
.owner = THIS_MODULE,
.parse_fn = parse_ofpart_partitions,
.name = "ofpart",
};
static int __init ofpart_parser_init(void)
{
return register_mtd_parser(&ofpart_parser);
}
module_init(ofpart_parser_init);
MODULE_LICENSE("GPL");
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