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