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[adm5120] prepare trxsplit to support sysupgrade

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git-svn-id: svn://svn.openwrt.org/openwrt/trunk@9085 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
juhosg
2007-10-01 09:51:32 +00:00
parent 6f924b0772
commit f6225af7d0
5 changed files with 99 additions and 52 deletions
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2
target/linux/adm5120/files/arch/mips/adm5120/Makefile
View File

@@ -9,5 +9,3 @@ obj-y += gpio.o
obj-y += platform.o
obj-y += reset.o
obj-y += time.o
obj-y += trxsplit.o

208
target/linux/adm5120/files/arch/mips/adm5120/trxsplit.c
View File

@@ -1,208 +0,0 @@
/*
* $Id$
*
* Copyright (C) 2007 OpenWrt.org
* Copyright (C) Gabor Juhos <juhosg at 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 Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/kmod.h>
#include <linux/root_dev.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/byteorder/generic.h>
#define PFX "trxsplit: "
#define TRX_MAGIC 0x30524448 /* "HDR0" */
#define TRX_VERSION 1
#define TRX_MAX_LEN 0x3A0000
#define TRX_NO_HEADER 1 /* Do not write TRX header */
#define TRX_GZ_FILES 0x2 /* Contains up to TRX_MAX_OFFSET individual gzip files */
#define TRX_MAX_OFFSET 3
#define TRX_MIN_KERNEL_SIZE 256*1024
struct trx_header {
u32 magic; /* "HDR0" */
u32 len; /* Length of file including header */
u32 crc32; /* 32-bit CRC from flag_version to end of file */
u32 flag_version; /* 0:15 flags, 16:31 version */
u32 offsets[TRX_MAX_OFFSET]; /* Offsets of partitions from start of header */
};
#define BLOCK_LEN_MIN 0x10000
static struct mtd_info *trx_mtd = NULL;
static unsigned long trx_offset = 0;
static int trx_nr_parts = 0;
static struct mtd_partition trx_parts[TRX_MAX_OFFSET];
static struct trx_header trx_hdr;
static int __init trxsplit_checktrx(struct mtd_info *mtd, unsigned long offset)
{
size_t retlen;
int err;
err = mtd->read(mtd, offset, sizeof(trx_hdr), &retlen, (void *)&trx_hdr);
if (err) {
printk(KERN_ALERT PFX "unable to read from '%s'\n", mtd->name);
goto err_out;
}
if (retlen != sizeof(trx_hdr)) {
printk(KERN_ALERT PFX "reading failed on '%s'\n", mtd->name);
goto err_out;
}
trx_hdr.magic = le32_to_cpu(trx_hdr.magic);
trx_hdr.len = le32_to_cpu(trx_hdr.len);
trx_hdr.crc32 = le32_to_cpu(trx_hdr.crc32);
trx_hdr.flag_version = le32_to_cpu(trx_hdr.flag_version);
trx_hdr.offsets[0] = le32_to_cpu(trx_hdr.offsets[0]);
trx_hdr.offsets[1] = le32_to_cpu(trx_hdr.offsets[1]);
trx_hdr.offsets[2] = le32_to_cpu(trx_hdr.offsets[2]);
/* sanity checks */
if (trx_hdr.magic != TRX_MAGIC)
goto err_out;
if (trx_hdr.len > mtd->size - offset)
goto err_out;
/* TODO: add crc32 checking too? */
return 0;
err_out:
return -1;
}
static int __init trxsplit_create_partitions(void)
{
struct mtd_partition *part = trx_parts;
int ret = 0;
int i;
if (trx_mtd == NULL)
goto out;
printk(KERN_INFO PFX "creating TRX partitions in '%s' (%d,%d)\n",
trx_mtd->name, MTD_BLOCK_MAJOR, trx_mtd->index);
for (i=0; i<TRX_MAX_OFFSET;i++) {
part = &trx_parts[i];
if (trx_hdr.offsets[i] == 0)
continue;
part->offset = trx_offset + trx_hdr.offsets[i];
trx_nr_parts++;
}
for (i=0; i<trx_nr_parts-1; i++) {
trx_parts[i].size = trx_parts[i+1].offset - trx_parts[i].offset;
}
trx_parts[i].size = trx_mtd->size - trx_parts[i].offset;
i=0;
part = &trx_parts[i];
if (part->size < TRX_MIN_KERNEL_SIZE) {
part->name = "loader";
i++;
}
part = &trx_parts[i];
part->name = "kernel";
i++;
part = &trx_parts[i];
part->name = "rootfs";
ret = add_mtd_partitions(trx_mtd, trx_parts, trx_nr_parts);
if (ret) {
printk(KERN_ALERT PFX "creating TRX partitions failed\n");
}
out:
return ret;
}
static void __init trxsplit_add_mtd(struct mtd_info *mtd)
{
unsigned long offset;
unsigned long blocklen;
int err;
if (trx_mtd)
return;
blocklen = mtd->erasesize;
if (blocklen < BLOCK_LEN_MIN)
blocklen = BLOCK_LEN_MIN;
printk(KERN_INFO PFX "searching TRX header in '%s'\n", mtd->name);
err = 0;
for (offset=0; offset < mtd->size; offset+=blocklen) {
err = trxsplit_checktrx(mtd, offset);
if (err == 0)
break;
}
if (err) {
printk(KERN_ALERT PFX "no TRX header found\n");
return;
}
printk(KERN_INFO PFX "TRX header found at 0x%lX\n", offset);
trx_mtd = mtd;
trx_offset = offset;
}
static void __init trxsplit_remove_mtd(struct mtd_info *mtd)
{
/* nothing to do */
}
static struct mtd_notifier trxsplit_notifier __initdata = {
.add = trxsplit_add_mtd,
.remove = trxsplit_remove_mtd,
};
static void __init trxsplit_find_trx(void)
{
register_mtd_user(&trxsplit_notifier);
unregister_mtd_user(&trxsplit_notifier);
}
static int __init trxsplit_init(void)
{
int ret;
trxsplit_find_trx();
ret = trxsplit_create_partitions();
return ret;
}
late_initcall(trxsplit_init);