diff options
Diffstat (limited to 'target/linux/at91/files/drivers/mtd')
| -rw-r--r-- | target/linux/at91/files/drivers/mtd/at91part.c | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/target/linux/at91/files/drivers/mtd/at91part.c b/target/linux/at91/files/drivers/mtd/at91part.c new file mode 100644 index 0000000..31f3bbd --- /dev/null +++ b/target/linux/at91/files/drivers/mtd/at91part.c @@ -0,0 +1,122 @@ +/* + * + * 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 + * + * Atmel AT91 flash partition table. (Modified by Hamish Guthrie). + * 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> + +static struct mtd_partition at91_parts[6]; + +static int create_mtd_partitions(struct mtd_info *master, + struct mtd_partition **pparts, + unsigned long origin) +{ + unsigned int offset, len; + unsigned int pre_size = 0x42000, root_max = 0x362400; + unsigned char buf[512]; + struct squashfs_super_block *sb = (struct squashfs_super_block *) buf; + + printk("Parsing AT91 partition map...\n"); + + at91_parts[0].name = "loaders"; + at91_parts[0].offset = 0; + at91_parts[0].size = 0x21000; + at91_parts[0].mask_flags = MTD_WRITEABLE; + + at91_parts[1].name = "ubparams"; + at91_parts[1].offset = 0x21000; + at91_parts[1].size = 0x8400; + at91_parts[1].mask_flags = 0; + + at91_parts[2].name = "kernel"; + at91_parts[2].offset = pre_size; + at91_parts[2].size = 0; + at91_parts[2].mask_flags = 0; + + at91_parts[3].name = "rootfs"; + at91_parts[3].offset = 0; + at91_parts[3].size = 0; + at91_parts[3].mask_flags = 0; + + for(offset = pre_size; offset < root_max; offset += master->erasesize) { + + memset(&buf, 0xe5, sizeof(buf)); + + if (master->read(master, offset, sizeof(buf), &len, buf) || len != sizeof(buf)) + break; + + if (*((__u32 *) buf) == SQUASHFS_MAGIC) { + printk(KERN_INFO "%s: Filesystem type: squashfs, size=0x%x\n", + master->name, (u32) sb->bytes_used); + + at91_parts[3].size = sb->bytes_used; + at91_parts[3].offset = offset; + len = at91_parts[3].offset + at91_parts[3].size; + len = ((len / (master->erasesize * 8)) + 1) * master->erasesize * 8; + at91_parts[3].size = len - at91_parts[3].offset; + at91_parts[2].size = offset - at91_parts[2].offset; + break; + } + } + + if (at91_parts[3].size == 0) { + printk(KERN_NOTICE "%s: Couldn't find root filesystem\n", master->name); + return -1; + } + + at91_parts[4].name = "rootfs_data"; + at91_parts[4].offset = root_max; + at91_parts[4].size = master->size - root_max; + at91_parts[4].mask_flags = 0; + + at91_parts[5].name = "complete"; + at91_parts[5].offset = 0; + at91_parts[5].size = master->size; + at91_parts[5].mask_flags = 0; + + *pparts = at91_parts; + return 6; +} + +static struct mtd_part_parser at91_parser = { + .owner = THIS_MODULE, + .parse_fn = create_mtd_partitions, + .name = "at91part", +}; + +static int __init at91_parser_init(void) +{ + register_mtd_parser(&at91_parser); + + return 0; +} + +module_init(at91_parser_init); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Felix Fietkau, Eugene Konev, Hamish Guthrie"); +MODULE_DESCRIPTION("MTD partitioning for Atmel at91"); |