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/*
* BCM63XX CFE image tag parser
*
* Copyright © 2006-2008 Florian Fainelli <florian@openwrt.org>
* Mike Albon <malbon@openwrt.org>
* Copyright © 2009-2010 Daniel Dickinson <openwrt@cshore.neomailbox.net>
* Copyright © 2011-2013 Jonas Gorski <jonas.gorski@gmail.com>
*
* 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.
*
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/bcm963xx_tag.h>
#include <linux/crc32.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sizes.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/of.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)
static int bcm963xx_read_imagetag(struct mtd_info *master, const char *name,
loff_t tag_offset, struct bcm_tag *buf)
{
int ret;
size_t retlen;
u32 computed_crc;
ret = mtd_read(master, tag_offset, sizeof(*buf), &retlen, (void *)buf);
if (ret)
return ret;
if (retlen != sizeof(*buf))
return -EIO;
computed_crc = crc32_le(IMAGETAG_CRC_START, (u8 *)buf,
offsetof(struct bcm_tag, header_crc));
if (computed_crc == buf->header_crc) {
STR_NULL_TERMINATE(buf->board_id);
STR_NULL_TERMINATE(buf->tag_version);
pr_info("%s: CFE image tag found at 0x%llx with version %s, board type %s\n",
name, tag_offset, buf->tag_version, buf->board_id);
return 0;
}
pr_warn("%s: CFE image tag at 0x%llx CRC invalid (expected %08x, actual %08x)\n",
name, tag_offset, buf->header_crc, computed_crc);
return -EINVAL;
}
static int bcm963xx_parse_imagetag_partitions(struct mtd_info *master,
const struct mtd_partition **pparts,
struct mtd_part_parser_data *data)
{
/* CFE, NVRAM and global Linux are always present */
int nrparts = 0, curpart = 0;
struct bcm_tag *buf = NULL;
struct mtd_partition *parts;
int ret;
unsigned int rootfsaddr, kerneladdr, spareaddr, offset;
unsigned int rootfslen, kernellen, sparelen, totallen;
int i;
bool rootfs_first = false;
buf = vmalloc(sizeof(struct bcm_tag));
if (!buf)
return -ENOMEM;
/* Get the tag */
ret = bcm963xx_read_imagetag(master, "rootfs", 0, buf);
if (!ret) {
STR_NULL_TERMINATE(buf->flash_image_start);
if (kstrtouint(buf->flash_image_start, 10, &rootfsaddr) ||
rootfsaddr < BCM963XX_EXTENDED_SIZE) {
pr_err("invalid rootfs address: %*ph\n",
(int)sizeof(buf->flash_image_start),
buf->flash_image_start);
goto out;
}
STR_NULL_TERMINATE(buf->kernel_address);
if (kstrtouint(buf->kernel_address, 10, &kerneladdr) ||
kerneladdr < BCM963XX_EXTENDED_SIZE) {
pr_err("invalid kernel address: %*ph\n",
(int)sizeof(buf->kernel_address),
buf->kernel_address);
goto out;
}
STR_NULL_TERMINATE(buf->kernel_length);
if (kstrtouint(buf->kernel_length, 10, &kernellen)) {
pr_err("invalid kernel length: %*ph\n",
(int)sizeof(buf->kernel_length),
buf->kernel_length);
goto out;
}
STR_NULL_TERMINATE(buf->total_length);
if (kstrtouint(buf->total_length, 10, &totallen)) {
pr_err("invalid total length: %*ph\n",
(int)sizeof(buf->total_length),
buf->total_length);
goto out;
}
/*
* Addresses are flash absolute, so convert to partition
* relative addresses. Assume either kernel or rootfs will
* directly follow the image tag.
*/
if (rootfsaddr < kerneladdr)
offset = rootfsaddr - sizeof(struct bcm_tag);
else
offset = kerneladdr - sizeof(struct bcm_tag);
kerneladdr = kerneladdr - offset;
rootfsaddr = rootfsaddr - offset;
spareaddr = roundup(totallen, master->erasesize);
if (rootfsaddr < kerneladdr) {
/* default Broadcom layout */
rootfslen = kerneladdr - rootfsaddr;
rootfs_first = true;
} else {
/* OpenWrt layout */
rootfsaddr = kerneladdr + kernellen;
rootfslen = spareaddr - rootfsaddr;
}
} else {
goto out;
}
sparelen = master->size - spareaddr;
/* Determine number of partitions */
if (rootfslen > 0)
nrparts++;
if (kernellen > 0)
nrparts++;
parts = kzalloc(sizeof(*parts) * nrparts + 10 * nrparts, GFP_KERNEL);
if (!parts) {
ret = -ENOMEM;
goto out;
}
/* Start building partition list */
if (kernellen > 0) {
int kernelpart = curpart;
if (rootfslen > 0 && rootfs_first)
kernelpart++;
parts[kernelpart].name = "kernel";
parts[kernelpart].offset = kerneladdr;
parts[kernelpart].size = kernellen;
curpart++;
}
if (rootfslen > 0) {
int rootfspart = curpart;
if (kernellen > 0 && rootfs_first)
rootfspart--;
parts[rootfspart].name = "rootfs";
parts[rootfspart].offset = rootfsaddr;
parts[rootfspart].size = rootfslen;
if (sparelen > 0 && !rootfs_first)
parts[rootfspart].size += sparelen;
curpart++;
}
for (i = 0; i < nrparts; i++)
pr_info("Partition %d is %s offset %llx and length %llx\n", i,
parts[i].name, parts[i].offset, parts[i].size);
pr_info("Spare partition is offset %x and length %x\n", spareaddr,
sparelen);
*pparts = parts;
ret = 0;
out:
vfree(buf);
if (ret)
return ret;
return nrparts;
}
static const struct of_device_id parse_bcm963xx_imagetag_match_table[] = {
{ .compatible = "brcm,bcm963xx-imagetag" },
{},
};
MODULE_DEVICE_TABLE(of, parse_bcm963xx_imagetag_match_table);
static struct mtd_part_parser bcm963xx_imagetag_parser = {
.parse_fn = bcm963xx_parse_imagetag_partitions,
.name = "bcm963xx-imagetag",
.of_match_table = parse_bcm963xx_imagetag_match_table,
};
module_mtd_part_parser(bcm963xx_imagetag_parser);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Daniel Dickinson <openwrt@cshore.neomailbox.net>");
MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
MODULE_AUTHOR("Mike Albon <malbon@openwrt.org>");
MODULE_AUTHOR("Jonas Gorski <jonas.gorski@gmail.com>");
MODULE_DESCRIPTION("MTD parser for BCM963XX CFE Image Tag partitions");
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