1/* 2 * 3 * Copyright (C) 2007 OpenWrt.org 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 18 * 19 * Atmel AT91 flash partition table. (Modified by Hamish Guthrie). 20 * Based on ar7 map by Felix Fietkau. 21 * 22 */ 23 24#include <linux/kernel.h> 25#include <linux/slab.h> 26 27#include <linux/mtd/mtd.h> 28#include <linux/mtd/partitions.h> 29#include <linux/bootmem.h> 30#include <linux/squashfs_fs.h> 31 32static struct mtd_partition at91_parts[6]; 33 34static int create_mtd_partitions(struct mtd_info *master, 35 struct mtd_partition **pparts, 36 unsigned long origin) 37{ 38 unsigned int offset, len; 39 unsigned int pre_size = 0x42000, root_max = 0x362400; 40 unsigned char buf[512]; 41 struct squashfs_super_block *sb = (struct squashfs_super_block *) buf; 42 43 printk("Parsing AT91 partition map...\n"); 44 45 at91_parts[0].name = "loaders"; 46 at91_parts[0].offset = 0; 47 at91_parts[0].size = 0x21000; 48 at91_parts[0].mask_flags = MTD_WRITEABLE; 49 50 at91_parts[1].name = "ubparams"; 51 at91_parts[1].offset = 0x21000; 52 at91_parts[1].size = 0x8400; 53 at91_parts[1].mask_flags = 0; 54 55 at91_parts[2].name = "kernel"; 56 at91_parts[2].offset = pre_size; 57 at91_parts[2].size = 0; 58 at91_parts[2].mask_flags = 0; 59 60 at91_parts[3].name = "rootfs"; 61 at91_parts[3].offset = 0; 62 at91_parts[3].size = 0; 63 at91_parts[3].mask_flags = 0; 64 65 for(offset = pre_size; offset < root_max; offset += master->erasesize) { 66 67 memset(&buf, 0xe5, sizeof(buf)); 68 69 if (master->read(master, offset, sizeof(buf), &len, buf) || len != sizeof(buf)) 70 break; 71 72 if (*((__u32 *) buf) == SQUASHFS_MAGIC) { 73 printk(KERN_INFO "%s: Filesystem type: squashfs, size=0x%x\n", 74 master->name, (u32) sb->bytes_used); 75 76 at91_parts[3].size = sb->bytes_used; 77 at91_parts[3].offset = offset; 78 len = at91_parts[3].offset + at91_parts[3].size; 79 len = ((len / (master->erasesize * 8)) + 1) * master->erasesize * 8; 80 at91_parts[3].size = len - at91_parts[3].offset; 81 at91_parts[2].size = offset - at91_parts[2].offset; 82 break; 83 } 84 } 85 86 if (at91_parts[3].size == 0) { 87 printk(KERN_NOTICE "%s: Couldn't find root filesystem\n", master->name); 88 return -1; 89 } 90 91 at91_parts[4].name = "rootfs_data"; 92 at91_parts[4].offset = root_max; 93 at91_parts[4].size = master->size - root_max; 94 at91_parts[4].mask_flags = 0; 95 96 at91_parts[5].name = "complete"; 97 at91_parts[5].offset = 0; 98 at91_parts[5].size = master->size; 99 at91_parts[5].mask_flags = 0; 100 101 *pparts = at91_parts; 102 return 6; 103} 104 105static struct mtd_part_parser at91_parser = { 106 .owner = THIS_MODULE, 107 .parse_fn = create_mtd_partitions, 108 .name = "at91part", 109}; 110 111static int __init at91_parser_init(void) 112{ 113 register_mtd_parser(&at91_parser); 114 115 return 0; 116} 117 118module_init(at91_parser_init); 119 120MODULE_LICENSE("GPL"); 121MODULE_AUTHOR("Felix Fietkau, Eugene Konev, Hamish Guthrie"); 122MODULE_DESCRIPTION("MTD partitioning for Atmel at91"); 123