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/*
* MTD split for Broadcom Whole Flash Image
*
* Copyright (C) 2020 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 je16_to_cpu(x) ((x).v16)
#define je32_to_cpu(x) ((x).v32)
#include <linux/crc32.h>
#include <linux/init.h>
#include <linux/jffs2.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"
#define BCM_WFI_PARTS 3
#define CFERAM_NAME "cferam"
#define CFERAM_NAME_LEN (sizeof(CFERAM_NAME) - 1)
#define KERNEL_NAME "vmlinux.lz"
#define KERNEL_NAME_LEN (sizeof(KERNEL_NAME) - 1)
#define OPENWRT_NAME "1-openwrt"
#define OPENWRT_NAME_LEN (sizeof(OPENWRT_NAME) - 1)
#define UBI_MAGIC 0x55424923
static u32 jffs2_dirent_crc(struct jffs2_raw_dirent *node)
{
return crc32(0, node, sizeof(struct jffs2_raw_dirent) - 8);
}
static bool jffs2_dirent_valid(struct jffs2_raw_dirent *node)
{
return ((je16_to_cpu(node->magic) == JFFS2_MAGIC_BITMASK) &&
(je16_to_cpu(node->nodetype) == JFFS2_NODETYPE_DIRENT) &&
je32_to_cpu(node->ino) &&
je32_to_cpu(node->node_crc) == jffs2_dirent_crc(node));
}
static int jffs2_find_file(struct mtd_info *master, uint8_t *buf,
const char *name, size_t name_len,
loff_t *offs)
{
struct jffs2_raw_dirent *node;
bool valid = false;
size_t retlen;
uint16_t magic;
int rc;
for (; *offs < master->size; *offs += master->erasesize) {
unsigned int block_offs = 0;
/* Skip CFE erased blocks */
rc = mtd_read(master, *offs, sizeof(magic), &retlen,
(void *) &magic);
if (rc || retlen != sizeof(magic)) {
continue;
}
/* Skip blocks not starting with JFFS2 magic */
if (magic != JFFS2_MAGIC_BITMASK)
continue;
/* Read full block */
rc = mtd_read(master, *offs, master->erasesize, &retlen,
(void *) buf);
if (rc)
return rc;
if (retlen != master->erasesize)
return -EINVAL;
while (block_offs < master->erasesize) {
node = (struct jffs2_raw_dirent *) &buf[block_offs];
if (!jffs2_dirent_valid(node)) {
block_offs += 4;
continue;
}
if (!memcmp(node->name, OPENWRT_NAME,
OPENWRT_NAME_LEN))
valid = true;
else if (!memcmp(node->name, name, name_len))
return valid ? 0 : -EINVAL;
block_offs += je32_to_cpu(node->totlen);
block_offs = (block_offs + 0x3) & ~0x3;
}
}
return -ENOENT;
}
static int ubifs_find(struct mtd_info *master, loff_t *offs)
{
uint32_t magic;
size_t retlen;
int rc;
for (; *offs < master->size; *offs += master->erasesize) {
rc = mtd_read(master, *offs, sizeof(magic), &retlen,
(unsigned char *) &magic);
if (rc || retlen != sizeof(magic))
continue;
if (be32_to_cpu(magic) == UBI_MAGIC)
return 0;
}
return -ENOENT;
}
static int mtdsplit_parse_bcm_wfi(struct mtd_info *master,
const struct mtd_partition **pparts,
struct mtd_part_parser_data *data)
{
struct mtd_partition *parts;
struct device_node *mtd_node;
loff_t cfe_off, kernel_off, rootfs_off;
bool cfe_part = true;
unsigned int num_parts = BCM_WFI_PARTS, cur_part = 0;
uint8_t *buf;
int ret;
buf = kzalloc(master->erasesize, GFP_KERNEL);
if (!buf)
return -ENOMEM;
mtd_node = mtd_get_of_node(master);
if (!mtd_node)
return -EINVAL;
if (of_device_is_compatible(mtd_node, "brcm,wfi-sercomm"))
cfe_part = false;
if (cfe_part) {
num_parts++;
cfe_off = 0;
ret = jffs2_find_file(master, buf, CFERAM_NAME,
CFERAM_NAME_LEN, &cfe_off);
if (ret) {
kfree(buf);
return ret;
}
kernel_off = cfe_off + master->erasesize;
} else {
kernel_off = 0;
}
ret = jffs2_find_file(master, buf, KERNEL_NAME, KERNEL_NAME_LEN,
&kernel_off);
kfree(buf);
if (ret)
return ret;
rootfs_off = kernel_off + master->erasesize;
ret = ubifs_find(master, &rootfs_off);
if (ret)
return ret;
parts = kzalloc(num_parts * sizeof(*parts), GFP_KERNEL);
if (!parts)
return -ENOMEM;
if (cfe_part) {
parts[cur_part].name = "cferam";
parts[cur_part].mask_flags = MTD_WRITEABLE;
parts[cur_part].offset = 0;
parts[cur_part].size = kernel_off;
cur_part++;
}
parts[cur_part].name = "firmware";
parts[cur_part].offset = kernel_off;
parts[cur_part].size = master->size - kernel_off;
cur_part++;
parts[cur_part].name = KERNEL_PART_NAME;
parts[cur_part].offset = kernel_off;
parts[cur_part].size = rootfs_off - kernel_off;
cur_part++;
parts[cur_part].name = UBI_PART_NAME;
parts[cur_part].offset = rootfs_off;
parts[cur_part].size = master->size - rootfs_off;
cur_part++;
*pparts = parts;
return num_parts;
}
static const struct of_device_id mtdsplit_fit_of_match_table[] = {
{ .compatible = "brcm,wfi" },
{ .compatible = "brcm,wfi-sercomm" },
{ },
};
static struct mtd_part_parser mtdsplit_bcm_wfi_parser = {
.owner = THIS_MODULE,
.name = "bcm-wfi-fw",
.of_match_table = mtdsplit_fit_of_match_table,
.parse_fn = mtdsplit_parse_bcm_wfi,
.type = MTD_PARSER_TYPE_FIRMWARE,
};
static int __init mtdsplit_bcm_wfi_init(void)
{
register_mtd_parser(&mtdsplit_bcm_wfi_parser);
return 0;
}
module_init(mtdsplit_bcm_wfi_init);
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