141 lines
3.7 KiB
C
141 lines
3.7 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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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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struct ar7_bin_rec header;
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unsigned int offset, len;
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unsigned int pre_size = master->erasesize, post_size = 0,
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root_offset = 0xe0000;
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int retries = 10;
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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 = master->erasesize;
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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].offset = 0;
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ar7_parts[1].size = master->erasesize;
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ar7_parts[1].mask_flags = 0;
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do {
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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 (!strncmp((char *)&header, "TIENV0.8", 8))
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ar7_parts[1].offset = pre_size;
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if (header.checksum == 0xfeedfa42)
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break;
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if (header.checksum == 0xfeed1281)
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break;
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pre_size += master->erasesize;
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} while (retries--);
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pre_size = offset;
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if (!ar7_parts[1].offset) {
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ar7_parts[1].offset = master->size - master->erasesize;
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post_size = master->erasesize;
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}
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switch (header.checksum) {
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case 0xfeedfa42:
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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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break;
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case 0xfeed1281:
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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 + 0xff;
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root_offset &= ~(u32)0xff;
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break;
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default:
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printk("Unknown magic: %08x\n", header.checksum);
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break;
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}
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master->read(master, root_offset, sizeof(header), &len, (u_char *)&header);
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if (header.checksum != SQUASHFS_MAGIC) {
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root_offset += master->erasesize - 1;
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root_offset &= ~(master->erasesize - 1);
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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 - pre_size - post_size;
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ar7_parts[2].mask_flags = 0;
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ar7_parts[3].name = "rootfs";
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ar7_parts[3].offset = root_offset;
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ar7_parts[3].size = master->size - root_offset - post_size;
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ar7_parts[3].mask_flags = 0;
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*pparts = ar7_parts;
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return 4;
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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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