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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* 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>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/bcm963xx_nvram.h>
#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>
#define BCM963XX_CFE_BLOCK_SIZE SZ_64K /* always at least 64KiB */
#define BCM963XX_CFE_MAGIC_OFFSET 0x4e0
#define BCM963XX_CFE_VERSION_OFFSET 0x570
#define BCM963XX_NVRAM_OFFSET 0x580
/* 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 bcm63xx_detect_cfe(struct mtd_info *master)
{
char buf[9];
int ret;
size_t retlen;
ret = mtd_read(master, BCM963XX_CFE_VERSION_OFFSET, 5, &retlen,
(void *)buf);
buf[retlen] = 0;
if (ret)
return ret;
if (strncmp("cfe-v", buf, 5) == 0)
return 0;
/* very old CFE's do not have the cfe-v string, so check for magic */
ret = mtd_read(master, BCM963XX_CFE_MAGIC_OFFSET, 8, &retlen,
(void *)buf);
buf[retlen] = 0;
return strncmp("CFE1CFE1", buf, 8);
}
static int bcm63xx_read_nvram(struct mtd_info *master,
struct bcm963xx_nvram *nvram)
{
u32 actual_crc, expected_crc;
size_t retlen;
int ret;
/* extract nvram data */
ret = mtd_read(master, BCM963XX_NVRAM_OFFSET, BCM963XX_NVRAM_V5_SIZE,
&retlen, (void *)nvram);
if (ret)
return ret;
ret = bcm963xx_nvram_checksum(nvram, &expected_crc, &actual_crc);
if (ret)
pr_warn("nvram checksum failed, contents may be invalid (expected %08x, got %08x)\n",
expected_crc, actual_crc);
if (!nvram->psi_size)
nvram->psi_size = BCM963XX_DEFAULT_PSI_SIZE;
return 0;
}
static const char * const bcm63xx_cfe_part_types[] = {
"bcm963xx-imagetag",
NULL,
};
static int bcm63xx_parse_cfe_nor_partitions(struct mtd_info *master,
const struct mtd_partition **pparts, struct bcm963xx_nvram *nvram)
{
struct mtd_partition *parts;
int nrparts = 3, curpart = 0;
unsigned int cfelen, nvramlen;
unsigned int cfe_erasesize;
int i;
cfe_erasesize = max_t(uint32_t, master->erasesize,
BCM963XX_CFE_BLOCK_SIZE);
cfelen = cfe_erasesize;
nvramlen = nvram->psi_size * SZ_1K;
nvramlen = roundup(nvramlen, cfe_erasesize);
parts = kzalloc(sizeof(*parts) * nrparts + 10 * nrparts, GFP_KERNEL);
if (!parts)
return -ENOMEM;
/* Start building partition list */
parts[curpart].name = "CFE";
parts[curpart].offset = 0;
parts[curpart].size = cfelen;
curpart++;
parts[curpart].name = "nvram";
parts[curpart].offset = master->size - nvramlen;
parts[curpart].size = nvramlen;
curpart++;
/* Global partition "linux" to make easy firmware upgrade */
parts[curpart].name = "linux";
parts[curpart].offset = cfelen;
parts[curpart].size = master->size - cfelen - nvramlen;
parts[curpart].types = bcm63xx_cfe_part_types;
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);
*pparts = parts;
return nrparts;
}
static int bcm63xx_parse_cfe_partitions(struct mtd_info *master,
const struct mtd_partition **pparts,
struct mtd_part_parser_data *data)
{
struct bcm963xx_nvram *nvram = NULL;
int ret;
if (bcm63xx_detect_cfe(master))
return -EINVAL;
nvram = vzalloc(sizeof(*nvram));
if (!nvram)
return -ENOMEM;
ret = bcm63xx_read_nvram(master, nvram);
if (ret)
goto out;
if (!mtd_type_is_nand(master))
ret = bcm63xx_parse_cfe_nor_partitions(master, pparts, nvram);
else
ret = -EINVAL;
out:
vfree(nvram);
return ret;
};
static const struct of_device_id parse_bcm63xx_cfe_match_table[] = {
{ .compatible = "brcm,bcm963xx-cfe-nor-partitions" },
{},
};
MODULE_DEVICE_TABLE(of, parse_bcm63xx_cfe_match_table);
static struct mtd_part_parser bcm63xx_cfe_parser = {
.parse_fn = bcm63xx_parse_cfe_partitions,
.name = "bcm63xxpart",
.of_match_table = parse_bcm63xx_cfe_match_table,
};
module_mtd_part_parser(bcm63xx_cfe_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 partitioning for BCM63XX CFE bootloaders");
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