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/*
* Firmware MTD split for BCM63XX, based on bcm63xxpart.c
*
* Copyright (C) 2006-2008 Florian Fainelli <florian@openwrt.org>
* Copyright (C) 2006-2008 Mike Albon <malbon@openwrt.org>
* Copyright (C) 2009-2010 Daniel Dickinson <openwrt@cshore.neomailbox.net>
* Copyright (C) 2011-2013 Jonas Gorski <jonas.gorski@gmail.com>
* Copyright (C) 2015 Simon Arlott <simon@fire.lp0.eu>
* Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.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.
*
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/bcm963xx_tag.h>
#include <linux/crc32.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/byteorder/generic.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include "mtdsplit.h"
/* Ensure strings read from flash structs are null terminated */
#define STR_NULL_TERMINATE(x) \
do { char *_str = (x); _str[sizeof(x) - 1] = 0; } while (0)
#define BCM63XX_NR_PARTS 2
static int bcm63xx_read_image_tag(struct mtd_info *master, loff_t offset,
struct bcm_tag *hdr)
{
int ret;
size_t retlen;
u32 computed_crc;
ret = mtd_read(master, offset, sizeof(*hdr), &retlen, (void *) hdr);
if (ret)
return ret;
if (retlen != sizeof(*hdr))
return -EIO;
computed_crc = crc32_le(IMAGETAG_CRC_START, (u8 *)hdr,
offsetof(struct bcm_tag, header_crc));
if (computed_crc == hdr->header_crc) {
STR_NULL_TERMINATE(hdr->board_id);
STR_NULL_TERMINATE(hdr->tag_version);
pr_info("CFE image tag found at 0x%llx with version %s, "
"board type %s\n", offset, hdr->tag_version,
hdr->board_id);
return 0;
} else {
pr_err("CFE image tag at 0x%llx CRC invalid "
"(expected %08x, actual %08x)\n",
offset, hdr->header_crc, computed_crc);
return 1;
}
}
static int bcm63xx_parse_partitions(struct mtd_info *master,
const struct mtd_partition **pparts,
struct bcm_tag *hdr)
{
struct mtd_partition *parts;
unsigned int flash_image_start;
unsigned int kernel_address;
unsigned int kernel_length;
size_t kernel_offset = 0, kernel_size = 0;
size_t rootfs_offset = 0, rootfs_size = 0;
int kernel_part, rootfs_part;
STR_NULL_TERMINATE(hdr->flash_image_start);
if (kstrtouint(hdr->flash_image_start, 10, &flash_image_start) ||
flash_image_start < BCM963XX_EXTENDED_SIZE) {
pr_err("invalid rootfs address: %*ph\n",
(int) sizeof(hdr->flash_image_start),
hdr->flash_image_start);
return -EINVAL;
}
STR_NULL_TERMINATE(hdr->kernel_address);
if (kstrtouint(hdr->kernel_address, 10, &kernel_address) ||
kernel_address < BCM963XX_EXTENDED_SIZE) {
pr_err("invalid kernel address: %*ph\n",
(int) sizeof(hdr->kernel_address), hdr->kernel_address);
return -EINVAL;
}
STR_NULL_TERMINATE(hdr->kernel_length);
if (kstrtouint(hdr->kernel_length, 10, &kernel_length) ||
!kernel_length) {
pr_err("invalid kernel length: %*ph\n",
(int) sizeof(hdr->kernel_length), hdr->kernel_length);
return -EINVAL;
}
kernel_offset = kernel_address - BCM963XX_EXTENDED_SIZE -
mtdpart_get_offset(master);
kernel_size = kernel_length;
if (flash_image_start < kernel_address) {
/* rootfs first */
rootfs_part = 0;
kernel_part = 1;
rootfs_offset = flash_image_start - BCM963XX_EXTENDED_SIZE -
mtdpart_get_offset(master);
rootfs_size = kernel_offset - rootfs_offset;
} else {
/* kernel first */
kernel_part = 0;
rootfs_part = 1;
rootfs_offset = kernel_offset + kernel_size;
rootfs_size = master->size - rootfs_offset;
}
if (mtd_check_rootfs_magic(master, rootfs_offset, NULL))
pr_warn("rootfs magic not found\n");
parts = kzalloc(BCM63XX_NR_PARTS * sizeof(*parts), GFP_KERNEL);
if (!parts)
return -ENOMEM;
parts[kernel_part].name = KERNEL_PART_NAME;
parts[kernel_part].offset = kernel_offset;
parts[kernel_part].size = kernel_size;
parts[rootfs_part].name = ROOTFS_PART_NAME;
parts[rootfs_part].offset = rootfs_offset;
parts[rootfs_part].size = rootfs_size;
*pparts = parts;
return BCM63XX_NR_PARTS;
}
static int mtdsplit_parse_bcm63xx(struct mtd_info *master,
const struct mtd_partition **pparts,
struct mtd_part_parser_data *data)
{
struct bcm_tag hdr;
loff_t offset;
if (mtd_type_is_nand(master))
return -EINVAL;
/* find bcm63xx_cfe image on erase block boundaries */
for (offset = 0; offset < master->size; offset += master->erasesize) {
if (!bcm63xx_read_image_tag(master, offset, (void *) &hdr))
return bcm63xx_parse_partitions(master, pparts,
(void *) &hdr);
}
return -EINVAL;
}
static const struct of_device_id mtdsplit_fit_of_match_table[] = {
{ .compatible = "brcm,bcm963xx-imagetag" },
{ },
};
static struct mtd_part_parser mtdsplit_bcm63xx_parser = {
.owner = THIS_MODULE,
.name = "bcm63xx-fw",
.of_match_table = mtdsplit_fit_of_match_table,
.parse_fn = mtdsplit_parse_bcm63xx,
.type = MTD_PARSER_TYPE_FIRMWARE,
};
static int __init mtdsplit_bcm63xx_init(void)
{
register_mtd_parser(&mtdsplit_bcm63xx_parser);
return 0;
}
module_init(mtdsplit_bcm63xx_init);
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