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123 lines
3.4 KiB
C
123 lines
3.4 KiB
C
/*
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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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* Atmel AT91 flash partition table. (Modified by Hamish Guthrie).
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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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static struct mtd_partition at91_parts[6];
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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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unsigned int offset, len;
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unsigned int pre_size = 0x42000, root_max = 0x362400;
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unsigned char buf[512];
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struct squashfs_super_block *sb = (struct squashfs_super_block *) buf;
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printk("Parsing AT91 partition map...\n");
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at91_parts[0].name = "loaders";
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at91_parts[0].offset = 0;
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at91_parts[0].size = 0x21000;
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at91_parts[0].mask_flags = MTD_WRITEABLE;
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at91_parts[1].name = "ubparams";
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at91_parts[1].offset = 0x21000;
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at91_parts[1].size = 0x8400;
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at91_parts[1].mask_flags = 0;
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at91_parts[2].name = "kernel";
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at91_parts[2].offset = pre_size;
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at91_parts[2].size = 0;
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at91_parts[2].mask_flags = 0;
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at91_parts[3].name = "rootfs";
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at91_parts[3].offset = 0;
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at91_parts[3].size = 0;
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at91_parts[3].mask_flags = 0;
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for(offset = pre_size; offset < root_max; offset += master->erasesize) {
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memset(&buf, 0xe5, sizeof(buf));
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if (master->read(master, offset, sizeof(buf), &len, buf) || len != sizeof(buf))
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break;
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if (*((__u32 *) buf) == SQUASHFS_MAGIC) {
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printk(KERN_INFO "%s: Filesystem type: squashfs, size=0x%x\n",
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master->name, (u32) sb->bytes_used);
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at91_parts[3].size = sb->bytes_used;
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at91_parts[3].offset = offset;
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len = at91_parts[3].offset + at91_parts[3].size;
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len = ((len / (master->erasesize * 8)) + 1) * master->erasesize * 8;
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at91_parts[3].size = len - at91_parts[3].offset;
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at91_parts[2].size = offset - at91_parts[2].offset;
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break;
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}
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}
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if (at91_parts[3].size == 0) {
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printk(KERN_NOTICE "%s: Couldn't find root filesystem\n", master->name);
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return -1;
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}
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at91_parts[4].name = "rootfs_data";
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at91_parts[4].offset = root_max;
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at91_parts[4].size = master->size - root_max;
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at91_parts[4].mask_flags = 0;
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at91_parts[5].name = "complete";
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at91_parts[5].offset = 0;
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at91_parts[5].size = master->size;
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at91_parts[5].mask_flags = 0;
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*pparts = at91_parts;
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return 6;
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}
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static struct mtd_part_parser at91_parser = {
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.owner = THIS_MODULE,
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.parse_fn = create_mtd_partitions,
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.name = "at91part",
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};
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static int __init at91_parser_init(void)
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{
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register_mtd_parser(&at91_parser);
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return 0;
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}
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module_init(at91_parser_init);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Felix Fietkau, Eugene Konev, Hamish Guthrie");
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MODULE_DESCRIPTION("MTD partitioning for Atmel at91");
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