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/*
* $Id$
*
* 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
*
* TI AR7 flash partition table.
* 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>
#include <linux/root_dev.h>
struct ar7_bin_rec {
unsigned int checksum;
unsigned int length;
unsigned int address;
};
static struct mtd_partition ar7_parts[5];
static int create_mtd_partitions(struct mtd_info *master,
struct mtd_partition **pparts,
unsigned long origin)
{
char sig[8];
struct ar7_bin_rec header;
unsigned int offset, new_offset, len;
struct squashfs_super_block sb;
unsigned int block_size = 0x10000, pre_size = 0x10000,
post_size = 0, root_offset = 0xe0000;
unsigned int p = 3;
printk("Parsing AR7 partition map...\n");
ar7_parts[0].name = "loader";
ar7_parts[0].offset = 0;
ar7_parts[0].size = block_size;
ar7_parts[0].mask_flags = MTD_WRITEABLE;
ar7_parts[1].name = "config";
ar7_parts[1].size = block_size;
ar7_parts[1].mask_flags = 0;
master->read(master, block_size, 8, &len, sig);
if (strncmp(sig, "TIENV0.8", 8)) {
ar7_parts[1].offset = master->size - block_size;
post_size = block_size;
} else {
ar7_parts[1].offset = block_size;
pre_size = block_size * 2;
}
ar7_parts[2].name = "linux";
ar7_parts[2].offset = pre_size;
ar7_parts[2].size = master->size - block_size * 2;
ar7_parts[2].mask_flags = 0;
offset = pre_size;
master->read(master, offset, sizeof(header), &len, (u_char *)&header);
if (header.checksum != 0xfeedfa42) {
printk("Unknown magic: %08x\n", header.checksum);
} else {
while (header.length) {
offset += sizeof(header) + header.length;
master->read(master, offset, sizeof(header),
&len, (u_char *)&header);
}
root_offset = offset + sizeof(header) + 4;
}
ar7_parts[p].name = "rootfs";
ar7_parts[p].offset = root_offset;
ar7_parts[p].size = master->size - root_offset - post_size;
ar7_parts[p++].mask_flags = 0;
master->read(master, root_offset, sizeof(sb), &len, (u_char *)&sb);
if (sb.s_magic == SQUASHFS_MAGIC) {
printk("Squashfs detected (size %Ld)\n", sb.bytes_used);
new_offset = root_offset + sb.bytes_used;
if ((new_offset % master->erasesize) > 0)
new_offset += master->erasesize -
(new_offset % master->erasesize);
ar7_parts[p].name = "rootfs_data";
ar7_parts[p].offset = new_offset;
ar7_parts[p].size = master->size - new_offset - post_size;
ar7_parts[p - 1].size -= ar7_parts[p].size;
ar7_parts[p - 1].mask_flags |= MTD_WRITEABLE;
ar7_parts[p++].mask_flags = 0;
ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, p - 1);
} else {
printk("Squashfs not found. Moving rootfs partition to next erase block\n");
if ((root_offset % master->erasesize) > 0)
root_offset += master->erasesize -
(root_offset % master->erasesize);
ar7_parts[p].offset = root_offset;
ar7_parts[p].size = master->size - root_offset - post_size;
ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, p);
}
*pparts = ar7_parts;
return p;
}
static struct mtd_part_parser ar7_parser = {
.owner = THIS_MODULE,
.parse_fn = create_mtd_partitions,
.name = "ar7part",
};
static int __init ar7_parser_init(void)
{
return register_mtd_parser(&ar7_parser);
}
module_init(ar7_parser_init);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Felix Fietkau, Eugene Konev");
MODULE_DESCRIPTION("MTD partitioning for TI AR7");
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