OpenWrt – Rev 4
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/*
* Copyright (C) 2009 Christian Daniel <cd@maintech.de>
* Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* TRX flash partition table.
* Based on ar7 map by Felix Fietkau <nbd@nbd.name>
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/version.h>
struct cybertan_header {
char magic[4];
u8 res1[4];
char fw_date[3];
char fw_ver[3];
char id[4];
char hw_ver;
char unused;
u8 flags[2];
u8 res2[10];
} __packed;
#define TRX_PARTS 3
#define TRX_MAGIC 0x30524448
#define TRX_MAX_OFFSET 3
struct trx_header {
__le32 magic; /* "HDR0" */
__le32 len; /* Length of file including header */
__le32 crc32; /* 32-bit CRC from flag_version to end of file */
__le32 flag_version; /* 0:15 flags, 16:31 version */
__le32 offsets[TRX_MAX_OFFSET]; /* Offsets of partitions from start of header */
} __packed;
#define IH_MAGIC 0x27051956 /* Image Magic Number */
#define IH_NMLEN 32 /* Image Name Length */
struct uimage_header {
__be32 ih_magic; /* Image Header Magic Number */
__be32 ih_hcrc; /* Image Header CRC Checksum */
__be32 ih_time; /* Image Creation Timestamp */
__be32 ih_size; /* Image Data Size */
__be32 ih_load; /* Data» Load Address */
__be32 ih_ep; /* Entry Point Address */
__be32 ih_dcrc; /* Image Data CRC Checksum */
uint8_t ih_os; /* Operating System */
uint8_t ih_arch; /* CPU architecture */
uint8_t ih_type; /* Image Type */
uint8_t ih_comp; /* Compression Type */
uint8_t ih_name[IH_NMLEN]; /* Image Name */
} __packed;
struct firmware_header {
struct cybertan_header cybertan;
struct trx_header trx;
struct uimage_header uimage;
} __packed;
static int cybertan_parse_partitions(struct mtd_info *master,
const struct mtd_partition **pparts,
struct mtd_part_parser_data *data)
{
struct firmware_header header;
struct trx_header *theader;
struct uimage_header *uheader;
struct mtd_partition *trx_parts;
size_t retlen;
unsigned int kernel_len;
int ret;
trx_parts = kcalloc(TRX_PARTS, sizeof(struct mtd_partition),
GFP_KERNEL);
if (!trx_parts) {
ret = -ENOMEM;
goto out;
}
ret = mtd_read(master, 0, sizeof(header),
&retlen, (uint8_t *)&header);
if (ret)
goto free_parts;
if (retlen != sizeof(header)) {
ret = -EIO;
goto free_parts;
}
theader = &header.trx;
if (theader->magic != cpu_to_le32(TRX_MAGIC)) {
printk(KERN_NOTICE "%s: no TRX header found\n", master->name);
goto free_parts;
}
uheader = &header.uimage;
if (uheader->ih_magic != cpu_to_be32(IH_MAGIC)) {
printk(KERN_NOTICE "%s: no uImage found\n", master->name);
goto free_parts;
}
kernel_len = le32_to_cpu(theader->offsets[1]) +
sizeof(struct cybertan_header);
trx_parts[0].name = "header";
trx_parts[0].offset = 0;
trx_parts[0].size = offsetof(struct firmware_header, uimage);
trx_parts[0].mask_flags = 0;
trx_parts[1].name = "kernel";
trx_parts[1].offset = trx_parts[0].offset + trx_parts[0].size;
trx_parts[1].size = kernel_len - trx_parts[0].size;
trx_parts[1].mask_flags = 0;
trx_parts[2].name = "rootfs";
trx_parts[2].offset = trx_parts[1].offset + trx_parts[1].size;
trx_parts[2].size = master->size - trx_parts[1].size - trx_parts[0].size;
trx_parts[2].mask_flags = 0;
*pparts = trx_parts;
return TRX_PARTS;
free_parts:
kfree(trx_parts);
out:
return ret;
}
static const struct of_device_id mtd_parser_cybertan_of_match_table[] = {
{ .compatible = "cybertan,trx" },
{},
};
MODULE_DEVICE_TABLE(of, mtd_parser_cybertan_of_match_table);
static struct mtd_part_parser mtd_parser_cybertan = {
.parse_fn = cybertan_parse_partitions,
.name = "cybertan-trx",
.of_match_table = mtd_parser_cybertan_of_match_table,
};
module_mtd_part_parser(mtd_parser_cybertan);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Christian Daniel <cd@maintech.de>");