143 lines
4.1 KiB
C
143 lines
4.1 KiB
C
/*
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* $Id$
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*
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* Copyright (C) 2007 OpenWrt.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* TI AR7 flash partition table.
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* Based on ar7 map by Felix Fietkau.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/partitions.h>
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#include <linux/bootmem.h>
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#include <linux/squashfs_fs.h>
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#include <linux/root_dev.h>
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struct ar7_bin_rec {
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unsigned int checksum;
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unsigned int length;
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unsigned int address;
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};
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static struct mtd_partition ar7_parts[5];
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static int create_mtd_partitions(struct mtd_info *master,
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struct mtd_partition **pparts,
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unsigned long origin)
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{
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char sig[8];
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struct ar7_bin_rec header;
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unsigned int offset, new_offset, len;
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struct squashfs_super_block sb;
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unsigned int block_size = 0x10000, pre_size = 0x10000,
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post_size = 0, root_offset = 0xe0000;
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unsigned int p = 3;
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printk("Parsing AR7 partition map...\n");
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ar7_parts[0].name = "loader";
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ar7_parts[0].offset = 0;
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ar7_parts[0].size = block_size;
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ar7_parts[0].mask_flags = MTD_WRITEABLE;
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ar7_parts[1].name = "config";
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ar7_parts[1].size = block_size;
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ar7_parts[1].mask_flags = 0;
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master->read(master, block_size, 8, &len, sig);
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if (strncmp(sig, "TIENV0.8", 8)) {
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ar7_parts[1].offset = master->size - block_size;
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post_size = block_size;
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} else {
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ar7_parts[1].offset = block_size;
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pre_size = block_size * 2;
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}
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ar7_parts[2].name = "linux";
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ar7_parts[2].offset = pre_size;
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ar7_parts[2].size = master->size - block_size * 2;
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ar7_parts[2].mask_flags = 0;
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offset = pre_size;
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master->read(master, offset, sizeof(header), &len, (u_char *)&header);
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if (header.checksum != 0xfeedfa42) {
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printk("Unknown magic: %08x\n", header.checksum);
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} else {
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while (header.length) {
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offset += sizeof(header) + header.length;
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master->read(master, offset, sizeof(header),
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&len, (u_char *)&header);
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}
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root_offset = offset + sizeof(header) + 4;
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}
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ar7_parts[p].name = "rootfs";
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ar7_parts[p].offset = root_offset;
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ar7_parts[p].size = master->size - root_offset - post_size;
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ar7_parts[p++].mask_flags = 0;
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master->read(master, root_offset, sizeof(sb), &len, (u_char *)&sb);
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if (sb.s_magic == SQUASHFS_MAGIC) {
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printk("Squashfs detected (size %Ld)\n", sb.bytes_used);
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new_offset = root_offset + sb.bytes_used;
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if ((new_offset % master->erasesize) > 0)
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new_offset += master->erasesize -
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(new_offset % master->erasesize);
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ar7_parts[p].name = "rootfs_data";
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ar7_parts[p].offset = new_offset;
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ar7_parts[p].size = master->size - new_offset - post_size;
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ar7_parts[p - 1].size -= ar7_parts[p].size;
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ar7_parts[p - 1].mask_flags |= MTD_WRITEABLE;
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ar7_parts[p++].mask_flags = 0;
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ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, p - 1);
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} else {
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printk("Squashfs not found. Moving rootfs partition to next erase block\n");
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if ((root_offset % master->erasesize) > 0)
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root_offset += master->erasesize -
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(root_offset % master->erasesize);
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ar7_parts[p].offset = root_offset;
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ar7_parts[p].size = master->size - root_offset - post_size;
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ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, p);
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}
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*pparts = ar7_parts;
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return p;
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}
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static struct mtd_part_parser ar7_parser = {
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.owner = THIS_MODULE,
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.parse_fn = create_mtd_partitions,
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.name = "ar7part",
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};
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static int __init ar7_parser_init(void)
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{
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return register_mtd_parser(&ar7_parser);
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}
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module_init(ar7_parser_init);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Felix Fietkau, Eugene Konev");
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MODULE_DESCRIPTION("MTD partitioning for TI AR7");
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