diff options
Diffstat (limited to 'target/linux/ar7/files/drivers/mtd/ar7part.c')
| -rw-r--r-- | target/linux/ar7/files/drivers/mtd/ar7part.c | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/target/linux/ar7/files/drivers/mtd/ar7part.c b/target/linux/ar7/files/drivers/mtd/ar7part.c new file mode 100644 index 0000000000..587bb31bb2 --- /dev/null +++ b/target/linux/ar7/files/drivers/mtd/ar7part.c @@ -0,0 +1,140 @@ +/* + * $Id$ + * + * 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) +{ + struct ar7_bin_rec header; + unsigned int offset, len; + unsigned int pre_size = master->erasesize, post_size = 0, + root_offset = 0xe0000; + int retries = 10; + + printk("Parsing AR7 partition map...\n"); + + 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 { + offset = pre_size; + master->read(master, offset, sizeof(header), &len, (u_char *)&header); + if (!strncmp((char *)&header, "TIENV0.8", 8)) + ar7_parts[1].offset = pre_size; + if (header.checksum == 0xfeedfa42) + break; + if (header.checksum == 0xfeed1281) + 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 0xfeedfa42: + while (header.length) { + offset += sizeof(header) + header.length; + master->read(master, offset, sizeof(header), + &len, (u_char *)&header); + } + root_offset = offset + sizeof(header) + 4; + break; + case 0xfeed1281: + while (header.length) { + offset += sizeof(header) + header.length; + master->read(master, offset, sizeof(header), + &len, (u_char *)&header); + } + root_offset = offset + sizeof(header) + 4 + 0xff; + root_offset &= ~(u32)0xff; + break; + default: + printk("Unknown magic: %08x\n", header.checksum); + break; + } + + master->read(master, root_offset, sizeof(header), &len, (u_char *)&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 4; +} + +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"); |