OpenWrt – Rev 4
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/*
* AudioCodes AC49x PSPBoot-based flash partition table
* Copyright 2012 Daniel Golle <daniel.golle@gmail.com>
*
* 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
*
*/
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/bootmem.h>
#include <linux/magic.h>
#include <linux/module.h>
#include <asm/mach-ar7/prom.h>
#define AC49X_MAXENVPARTS 8
#define AC49X_PARTTYPE_LOADER 0
#define AC49X_PARTTYPE_BOOTENV 1
#define AC49X_PARTTYPE_LINUX 2
#define AC49X_PARTTYPE_ROOTFS 3
#define AC49X_PARTTYPE_UNKNOWN 4
#define AC49X_NUM_PARTTYPES 5
#define AC49X_FLASH_ADDRMASK 0x00FFFFFF
#define AC49X_LOADER_MAGIC 0x40809000
#define AC49X_LINUX_MAGIC 0x464c457f /* ELF */
#define AC49X_BOOTENV_MAGIC 0x4578614d /* MaxE */
#define ROOTFS_MIN_OFFSET 0xC0000
int parse_partvar(const unsigned char *partvar, struct mtd_partition *part)
{
unsigned int partstart, partend;
unsigned int pnum;
pnum = sscanf(partvar, "0x%x,0x%x", &partstart, &partend);
if (pnum != 2)
return 1;
part->offset = partstart & AC49X_FLASH_ADDRMASK;
part->size = partend - partstart;
return 0;
}
int detect_parttype(struct mtd_info *master, struct mtd_partition part)
{
unsigned int magic;
size_t len;
if (part.size < 4)
return -1;
mtd_read(master, part.offset, sizeof(magic), &len,
(uint8_t *)&magic);
if (len != sizeof(magic))
return -1;
switch (magic) {
case AC49X_LOADER_MAGIC:
return AC49X_PARTTYPE_LOADER;
case AC49X_LINUX_MAGIC:
return AC49X_PARTTYPE_LINUX;
case SQUASHFS_MAGIC:
case CRAMFS_MAGIC:
case CRAMFS_MAGIC_WEND:
return AC49X_PARTTYPE_ROOTFS;
case AC49X_BOOTENV_MAGIC:
return AC49X_PARTTYPE_BOOTENV;
default:
switch (magic & 0xFF) {
case JFFS2_SUPER_MAGIC:
return AC49X_PARTTYPE_ROOTFS;
}
switch (magic >> 8) {
case JFFS2_SUPER_MAGIC:
return AC49X_PARTTYPE_ROOTFS;
}
return AC49X_PARTTYPE_UNKNOWN;
}
}
const char *partnames[] = {
"loader",
"config",
"linux",
"rootfs",
"data"
};
void gen_partname(unsigned int type,
unsigned int *typenumeration,
struct mtd_partition *part)
{
char *s = kzalloc(sizeof(char) * 8, GFP_KERNEL);
(typenumeration[type])++;
if (typenumeration[type] == 1)
sprintf(s, "%s", partnames[type]);
else
sprintf(s, "%s%d", partnames[type], typenumeration[type]);
part->name = s;
}
static int create_mtd_partitions(struct mtd_info *master,
const struct mtd_partition **pparts,
struct mtd_part_parser_data *data)
{
unsigned int envpartnum = 0, linuxpartnum = 0;
unsigned int typenumeration[5] = { 0, 0, 0, 0, 0 };
unsigned char evn[5];
const unsigned char *partvar = NULL;
struct mtd_partition *ac49x_parts;
ac49x_parts = kzalloc(sizeof(*ac49x_parts) * AC49X_MAXENVPARTS,
GFP_KERNEL);
if (!ac49x_parts)
return -ENOMEM;
linuxpartnum = 0;
for (envpartnum = 0; envpartnum < AC49X_MAXENVPARTS; envpartnum++) {
struct mtd_partition parsepart;
unsigned int offset, size, type;
int err;
sprintf(evn, "mtd%d", envpartnum);
partvar = prom_getenv(evn);
if (!partvar)
continue;
err = parse_partvar(partvar, &parsepart);
if (err)
continue;
offset = parsepart.offset;
size = parsepart.size;
type = detect_parttype(master, parsepart);
gen_partname(type, typenumeration, &parsepart);
/* protect loader */
if (type == AC49X_PARTTYPE_LOADER)
parsepart.mask_flags = MTD_WRITEABLE;
else
parsepart.mask_flags = 0;
memcpy(&(ac49x_parts[linuxpartnum]), &parsepart,
sizeof(struct mtd_partition));
/* scan for contained rootfs */
if (type == AC49X_PARTTYPE_LINUX) {
parsepart.offset += ROOTFS_MIN_OFFSET &
~(master->erasesize - 1);
parsepart.size -= ROOTFS_MIN_OFFSET &
~(master->erasesize - 1);
do {
unsigned int size, offset;
size = parsepart.size;
offset = parsepart.offset;
type = detect_parttype(master, parsepart);
if (type == AC49X_PARTTYPE_ROOTFS) {
gen_partname(type, typenumeration,
&parsepart);
printk(KERN_INFO
"%s %s: 0x%08x@0x%08x\n",
"detected sub-partition",
parsepart.name,
(unsigned int)parsepart.size,
(unsigned int)parsepart.offset);
linuxpartnum++;
memcpy(&(ac49x_parts[linuxpartnum]),
&parsepart,
sizeof(struct mtd_partition));
break;
}
parsepart.offset += master->erasesize;
parsepart.size -= master->erasesize;
} while (parsepart.size >= master->erasesize);
}
linuxpartnum++;
}
*pparts = ac49x_parts;
return linuxpartnum;
}
static struct mtd_part_parser ac49x_parser = {
.owner = THIS_MODULE,
.parse_fn = create_mtd_partitions,
.name = "ac49xpart",
};
static int __init ac49x_parser_init(void)
{
register_mtd_parser(&ac49x_parser);
return 0;
}
module_init(ac49x_parser_init);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Daniel Golle <daniel.golle@gmail.com>");
MODULE_DESCRIPTION("MTD partitioning for AudioCodes AC49x");