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/*
* $Id: at91part.c 6948 2007-04-15 04:01:45Z hcg $
*
* Copyright (C) 2007 OpenWrt.org
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Atmel AT91 flash partition table. (Modified by Hamish Guthrie).
* Based on ar7 map by Felix Fietkau.
*
*/
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/bootmem.h>
#include <linux/squashfs_fs.h>
static struct mtd_partition at91_parts[6];
static int create_mtd_partitions(struct mtd_info *master,
struct mtd_partition **pparts,
unsigned long origin)
{
unsigned int offset, len;
unsigned int pre_size = 0x42000, root_max = 0x362400;
unsigned char buf[512];
struct squashfs_super_block *sb = (struct squashfs_super_block *) buf;
printk("Parsing AT91 partition map...\n");
at91_parts[0].name = "loaders";
at91_parts[0].offset = 0;
at91_parts[0].size = 0x21000;
at91_parts[0].mask_flags = MTD_WRITEABLE;
at91_parts[1].name = "ubparams";
at91_parts[1].offset = 0x21000;
at91_parts[1].size = 0x8400;
at91_parts[1].mask_flags = 0;
at91_parts[2].name = "kernel";
at91_parts[2].offset = pre_size;
at91_parts[2].size = 0;
at91_parts[2].mask_flags = 0;
at91_parts[3].name = "rootfs";
at91_parts[3].offset = 0;
at91_parts[3].size = 0;
at91_parts[3].mask_flags = 0;
for(offset = pre_size; offset < root_max; offset += master->erasesize) {
memset(&buf, 0xe5, sizeof(buf));
if (master->read(master, offset, sizeof(buf), &len, buf) || len != sizeof(buf))
break;
if (*((__u32 *) buf) == SQUASHFS_MAGIC) {
printk(KERN_INFO "%s: Filesystem type: squashfs, size=0x%x\n",
master->name, (u32) sb->bytes_used);
at91_parts[3].size = sb->bytes_used;
at91_parts[3].offset = offset;
len = at91_parts[3].offset + at91_parts[3].size;
len = ((len / (master->erasesize * 8)) + 1) * master->erasesize * 8;
at91_parts[3].size = len - at91_parts[3].offset;
at91_parts[2].size = offset - at91_parts[2].offset;
break;
}
}
if (at91_parts[3].size == 0) {
printk(KERN_NOTICE "%s: Couldn't find root filesystem\n", master->name);
return -1;
}
at91_parts[4].name = "rootfs_data";
at91_parts[4].offset = root_max;
at91_parts[4].size = master->size - root_max;
at91_parts[4].mask_flags = 0;
at91_parts[5].name = "complete";
at91_parts[5].offset = 0;
at91_parts[5].size = master->size;
at91_parts[5].mask_flags = 0;
*pparts = at91_parts;
return 6;
}
static struct mtd_part_parser at91_parser = {
.owner = THIS_MODULE,
.parse_fn = create_mtd_partitions,
.name = "at91part",
};
static int __init at91_parser_init(void)
{
return register_mtd_parser(&at91_parser);
}
module_init(at91_parser_init);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Felix Fietkau, Eugene Konev, Hamish Guthrie");
MODULE_DESCRIPTION("MTD partitioning for Atmel at91");
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