| /* |
| * Copyright (C) 2012 John Crispin <blogic@openwrt.org> |
| * Copyright (C) 2015 Martin Blumenstingl <martin.blumenstingl@googlemail.com> |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 as published |
| * by the Free Software Foundation. |
| * |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/kernel.h> |
| #include <linux/slab.h> |
| #include <linux/mtd/mtd.h> |
| #include <linux/mtd/partitions.h> |
| #include <linux/byteorder/generic.h> |
| #include <linux/of.h> |
| |
| #include "mtdsplit.h" |
| |
| #define EVA_NR_PARTS 2 |
| #define EVA_MAGIC 0xfeed1281 |
| #define EVA_FOOTER_SIZE 0x18 |
| #define EVA_DUMMY_SQUASHFS_SIZE 0x100 |
| |
| struct eva_image_header { |
| uint32_t magic; |
| uint32_t size; |
| }; |
| |
| static int mtdsplit_parse_eva(struct mtd_info *master, |
| const struct mtd_partition **pparts, |
| struct mtd_part_parser_data *data) |
| { |
| struct mtd_partition *parts; |
| struct eva_image_header hdr; |
| size_t retlen; |
| unsigned long kernel_size, rootfs_offset; |
| int err; |
| |
| err = mtd_read(master, 0, sizeof(hdr), &retlen, (void *) &hdr); |
| if (err) |
| return err; |
| |
| if (retlen != sizeof(hdr)) |
| return -EIO; |
| |
| if (le32_to_cpu(hdr.magic) != EVA_MAGIC) |
| return -EINVAL; |
| |
| kernel_size = le32_to_cpu(hdr.size) + EVA_FOOTER_SIZE; |
| |
| /* rootfs starts at the next 0x10000 boundary: */ |
| rootfs_offset = round_up(kernel_size, 0x10000); |
| |
| /* skip the dummy EVA squashfs partition (with wrong endianness): */ |
| rootfs_offset += EVA_DUMMY_SQUASHFS_SIZE; |
| |
| if (rootfs_offset >= master->size) |
| return -EINVAL; |
| |
| err = mtd_check_rootfs_magic(master, rootfs_offset, NULL); |
| if (err) |
| return err; |
| |
| parts = kzalloc(EVA_NR_PARTS * sizeof(*parts), GFP_KERNEL); |
| if (!parts) |
| return -ENOMEM; |
| |
| parts[0].name = KERNEL_PART_NAME; |
| parts[0].offset = 0; |
| parts[0].size = kernel_size; |
| |
| parts[1].name = ROOTFS_PART_NAME; |
| parts[1].offset = rootfs_offset; |
| parts[1].size = master->size - rootfs_offset; |
| |
| *pparts = parts; |
| return EVA_NR_PARTS; |
| } |
| |
| static const struct of_device_id mtdsplit_eva_of_match_table[] = { |
| { .compatible = "avm,eva-firmware" }, |
| {}, |
| }; |
| |
| static struct mtd_part_parser mtdsplit_eva_parser = { |
| .owner = THIS_MODULE, |
| .name = "eva-fw", |
| .of_match_table = mtdsplit_eva_of_match_table, |
| .parse_fn = mtdsplit_parse_eva, |
| .type = MTD_PARSER_TYPE_FIRMWARE, |
| }; |
| |
| static int __init mtdsplit_eva_init(void) |
| { |
| register_mtd_parser(&mtdsplit_eva_parser); |
| |
| return 0; |
| } |
| |
| subsys_initcall(mtdsplit_eva_init); |