// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright © 2007 Eugene Konev <ejka@openwrt.org>
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*
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* TI AR7 flash partition table.
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* Based on ar7 map by Felix Fietkau <nbd@openwrt.org>
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/partitions.h>
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#include <linux/memblock.h>
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#include <linux/module.h>
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#include <uapi/linux/magic.h>
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#define AR7_PARTS 4
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#define ROOT_OFFSET 0xe0000
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#define LOADER_MAGIC1 le32_to_cpu(0xfeedfa42)
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#define LOADER_MAGIC2 le32_to_cpu(0xfeed1281)
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struct ar7_bin_rec {
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unsigned int checksum;
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unsigned int length;
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unsigned int address;
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};
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static int create_mtd_partitions(struct mtd_info *master,
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const struct mtd_partition **pparts,
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struct mtd_part_parser_data *data)
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{
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struct ar7_bin_rec header;
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unsigned int offset;
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size_t len;
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unsigned int pre_size = master->erasesize, post_size = 0;
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unsigned int root_offset = ROOT_OFFSET;
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int retries = 10;
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struct mtd_partition *ar7_parts;
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ar7_parts = kcalloc(AR7_PARTS, sizeof(*ar7_parts), GFP_KERNEL);
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if (!ar7_parts)
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return -ENOMEM;
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ar7_parts[0].name = "loader";
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ar7_parts[0].offset = 0;
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ar7_parts[0].size = master->erasesize;
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ar7_parts[0].mask_flags = MTD_WRITEABLE;
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ar7_parts[1].name = "config";
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ar7_parts[1].offset = 0;
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ar7_parts[1].size = master->erasesize;
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ar7_parts[1].mask_flags = 0;
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do { /* Try 10 blocks starting from master->erasesize */
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offset = pre_size;
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mtd_read(master, offset, sizeof(header), &len,
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(uint8_t *)&header);
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if (!strncmp((char *)&header, "TIENV0.8", 8))
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ar7_parts[1].offset = pre_size;
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if (header.checksum == LOADER_MAGIC1)
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break;
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if (header.checksum == LOADER_MAGIC2)
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break;
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pre_size += master->erasesize;
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} while (retries--);
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pre_size = offset;
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if (!ar7_parts[1].offset) {
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ar7_parts[1].offset = master->size - master->erasesize;
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post_size = master->erasesize;
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}
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switch (header.checksum) {
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case LOADER_MAGIC1:
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while (header.length) {
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offset += sizeof(header) + header.length;
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mtd_read(master, offset, sizeof(header), &len,
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(uint8_t *)&header);
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}
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root_offset = offset + sizeof(header) + 4;
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break;
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case LOADER_MAGIC2:
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while (header.length) {
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offset += sizeof(header) + header.length;
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mtd_read(master, offset, sizeof(header), &len,
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(uint8_t *)&header);
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}
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root_offset = offset + sizeof(header) + 4 + 0xff;
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root_offset &= ~(uint32_t)0xff;
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break;
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default:
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printk(KERN_WARNING "Unknown magic: %08x\n", header.checksum);
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break;
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}
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mtd_read(master, root_offset, sizeof(header), &len, (u8 *)&header);
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if (header.checksum != SQUASHFS_MAGIC) {
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root_offset += master->erasesize - 1;
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root_offset &= ~(master->erasesize - 1);
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}
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ar7_parts[2].name = "linux";
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ar7_parts[2].offset = pre_size;
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ar7_parts[2].size = master->size - pre_size - post_size;
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ar7_parts[2].mask_flags = 0;
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ar7_parts[3].name = "rootfs";
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ar7_parts[3].offset = root_offset;
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ar7_parts[3].size = master->size - root_offset - post_size;
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ar7_parts[3].mask_flags = 0;
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*pparts = ar7_parts;
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return AR7_PARTS;
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}
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static struct mtd_part_parser ar7_parser = {
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.parse_fn = create_mtd_partitions,
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.name = "ar7part",
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};
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module_mtd_part_parser(ar7_parser);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR( "Felix Fietkau <nbd@openwrt.org>, "
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"Eugene Konev <ejka@openwrt.org>");
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MODULE_DESCRIPTION("MTD partitioning for TI AR7");
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