/* * Copyright © 2007 Eugene Konev <ejka@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 <nbd@openwrt.org> * */ #include <linux/kernel.h> #include <linux/slab.h> #include <linux/mtd/mtd.h> #include <linux/mtd/partitions.h> #include <linux/bootmem.h> #include <linux/magic.h> #define AR7_PARTS 4 #define ROOT_OFFSET 0xe0000 #define LOADER_MAGIC1 le32_to_cpu(0xfeedfa42) #define LOADER_MAGIC2 le32_to_cpu(0xfeed1281) #ifndef SQUASHFS_MAGIC #define SQUASHFS_MAGIC 0x73717368 #endif struct ar7_bin_rec { unsigned int checksum; unsigned int length; unsigned int address; }; static struct mtd_partition ar7_parts[AR7_PARTS]; static int create_mtd_partitions(struct mtd_info *master, struct mtd_partition **pparts, unsigned long origin) { struct ar7_bin_rec header; unsigned int offset; size_t len; unsigned int pre_size = master->erasesize, post_size = 0; unsigned int root_offset = ROOT_OFFSET; int retries = 10; ar7_parts[0].name = "loader"; ar7_parts[0].offset = 0; ar7_parts[0].size = master->erasesize; ar7_parts[0].mask_flags = MTD_WRITEABLE; ar7_parts[1].name = "config"; ar7_parts[1].offset = 0; ar7_parts[1].size = master->erasesize; ar7_parts[1].mask_flags = 0; do { /* Try 10 blocks starting from master->erasesize */ offset = pre_size; master->read(master, offset, sizeof(header), &len, (uint8_t *)&header); if (!strncmp((char *)&header, "TIENV0.8", 8)) ar7_parts[1].offset = pre_size; if (header.checksum == LOADER_MAGIC1) break; if (header.checksum == LOADER_MAGIC2) break; pre_size += master->erasesize; } while (retries--); pre_size = offset; if (!ar7_parts[1].offset) { ar7_parts[1].offset = master->size - master->erasesize; post_size = master->erasesize; } switch (header.checksum) { case LOADER_MAGIC1: while (header.length) { offset += sizeof(header) + header.length; master->read(master, offset, sizeof(header), &len, (uint8_t *)&header); } root_offset = offset + sizeof(header) + 4; break; case LOADER_MAGIC2: while (header.length) { offset += sizeof(header) + header.length; master->read(master, offset, sizeof(header), &len, (uint8_t *)&header); } root_offset = offset + sizeof(header) + 4 + 0xff; root_offset &= ~(uint32_t)0xff; break; default: printk(KERN_WARNING "Unknown magic: %08x\n", header.checksum); break; } master->read(master, root_offset, sizeof(header), &len, (u8 *)&header); if (header.checksum != SQUASHFS_MAGIC) { root_offset += master->erasesize - 1; root_offset &= ~(master->erasesize - 1); } ar7_parts[2].name = "linux"; ar7_parts[2].offset = pre_size; ar7_parts[2].size = master->size - pre_size - post_size; ar7_parts[2].mask_flags = 0; ar7_parts[3].name = "rootfs"; ar7_parts[3].offset = root_offset; ar7_parts[3].size = master->size - root_offset - post_size; ar7_parts[3].mask_flags = 0; *pparts = ar7_parts; return AR7_PARTS; } 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 <nbd@openwrt.org>, " "Eugene Konev <ejka@openwrt.org>"); MODULE_DESCRIPTION("MTD partitioning for TI AR7");