diff options
Diffstat (limited to 'target/linux/ar7-2.6/files/drivers/mtd/ar7part.c')
| -rw-r--r-- | target/linux/ar7-2.6/files/drivers/mtd/ar7part.c | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/target/linux/ar7-2.6/files/drivers/mtd/ar7part.c b/target/linux/ar7-2.6/files/drivers/mtd/ar7part.c new file mode 100644 index 0000000000..2b3edf67b7 --- /dev/null +++ b/target/linux/ar7-2.6/files/drivers/mtd/ar7part.c @@ -0,0 +1,139 @@ +/* + * $Id$ + * + * Copyright (C) 2007 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. + * + */ + +#include <linux/kernel.h> +#include <linux/slab.h> + +#include <linux/mtd/mtd.h> +#include <linux/mtd/partitions.h> +#include <linux/bootmem.h> +#include <linux/squashfs_fs.h> + +struct ar7_bin_rec { + unsigned int checksum; + unsigned int length; + unsigned int address; +}; + +static struct mtd_partition ar7_parts[5]; + +static int create_mtd_partitions(struct mtd_info *master, + struct mtd_partition **pparts, + unsigned long origin) +{ + char sig[8]; + struct ar7_bin_rec header; + unsigned int offset, new_offset, len; + struct squashfs_super_block sb; + unsigned int block_size = 0x10000, pre_size = 0x10000, + post_size = 0, root_offset = 0xe0000; + unsigned int p = 3; + + printk("Parsing AR7 partition map...\n"); + + ar7_parts[0].name = "loader"; + ar7_parts[0].offset = 0; + ar7_parts[0].size = block_size; + ar7_parts[0].mask_flags = MTD_WRITEABLE; + + ar7_parts[1].name = "config"; + ar7_parts[1].size = block_size; + ar7_parts[1].mask_flags = 0; + + master->read(master, block_size, 8, &len, sig); + if (strncmp(sig, "TIENV0.8", 8)) { + ar7_parts[1].offset = master->size - block_size; + post_size = block_size; + } else { + ar7_parts[1].offset = block_size; + pre_size = block_size * 2; + } + + ar7_parts[2].name = "linux"; + ar7_parts[2].offset = pre_size; + ar7_parts[2].size = master->size - block_size * 2; + ar7_parts[2].mask_flags = 0; + + offset = pre_size; + master->read(master, offset, sizeof(header), &len, (u_char *)&header); + if (header.checksum != 0xfeedfa42) { + printk("Unknown magic: %08x\n", header.checksum); + } else { + while (header.length) { + offset += sizeof(header) + header.length; + master->read(master, offset, sizeof(header), + &len, (u_char *)&header); + } + root_offset = offset + sizeof(header) + 4; + } + + ar7_parts[p].name = "rootfs"; + ar7_parts[p].offset = root_offset; + ar7_parts[p].size = master->size - root_offset - post_size; + ar7_parts[p++].mask_flags = 0; + + master->read(master, root_offset, sizeof(sb), &len, (u_char *)&sb); + if (sb.s_magic == SQUASHFS_MAGIC) { + printk("Squashfs detected (size %Ld)\n", sb.bytes_used); + new_offset = root_offset + sb.bytes_used; + + if ((new_offset % master->erasesize) > 0) + new_offset += master->erasesize - + (new_offset % master->erasesize); + + ar7_parts[p].name = "rootfs_data"; + ar7_parts[p].offset = new_offset; + ar7_parts[p].size = master->size - new_offset - post_size; + ar7_parts[p - 1].size -= ar7_parts[p].size; + ar7_parts[p - 1].mask_flags |= MTD_WRITEABLE; + ar7_parts[p++].mask_flags = 0; + } else { + printk("Squashfs not found. Moving rootfs partition to next erase block\n"); + if ((root_offset % master->erasesize) > 0) + root_offset += master->erasesize - + (root_offset % master->erasesize); + + ar7_parts[p].offset = root_offset; + ar7_parts[p].size = master->size - root_offset - post_size; + } + *pparts = ar7_parts; + return p; +} + +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, Eugene Konev"); +MODULE_DESCRIPTION("MTD partitioning for TI AR7"); |