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openwrt-owl/target/linux/adm8668/files/drivers/mtd/maps/adm8668.c

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/*
* Infineon/ADMTek ADM8668 (WildPass) partition parser support
*
* Copyright (C) 2010 Scott Nicholas <neutronscott@scottn.us>
* Copyright (C) 2012 Florian Fainelli <florian@openwrt.org>
*
* original functions for finding root filesystem from Mike Baker
*
* 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 SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* 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.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*
*
* Copyright 2004, Broadcom Corporation
* All Rights Reserved.
*
* THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
* KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
* SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/wait.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/vmalloc.h>
#include <linux/slab.h>
#include <linux/crc32.h>
#include <linux/magic.h>
#define PFX "adm8668-part: "
/* first a little bit about the headers i need.. */
/* just interested in part of the full struct */
struct squashfs_super_block {
__le32 s_magic;
__le32 pad0[9]; /* it's not really padding */
__le64 bytes_used;
};
#define IH_MAGIC 0x56190527 /* Image Magic Number */
struct uboot_header {
uint32_t ih_magic; /* Image Header Magic Number */
uint32_t ih_hcrc; /* Image Header CRC Checksum */
uint32_t ih_time; /* Image Creation Timestamp */
uint32_t ih_size; /* Image Data Size */
uint32_t ih_load; /* Data Load Address */
uint32_t ih_ep; /* Entry Point Address */
uint32_t 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 */
char ih_name[32]; /* image name */
};
/* in case i wanna change stuff later, and to clarify the math section... */
#define PART_LINUX 0
#define PART_ROOTFS 1
#define PART_UBOOT_ENV 2
#define NR_PARTS 3
static int adm8668_parse_partitions(struct mtd_info *master,
struct mtd_partition **pparts,
struct mtd_part_parser_data *data)
{
int ret;
struct uboot_header uhdr;
int off, blocksize;
size_t len, linux_len;
struct squashfs_super_block shdr;
struct erase_info erase_info;
struct mtd_partition *adm8668_parts;
memset(&erase_info, 0, sizeof(erase_info));
blocksize = master->erasesize;
if (blocksize < 0x10000)
blocksize = 0x10000;
adm8668_parts = kzalloc(sizeof(*adm8668_parts) * NR_PARTS, GFP_KERNEL);
if (!adm8668_parts)
return -ENOMEM;
adm8668_parts[PART_LINUX].name = kstrdup("linux", GFP_KERNEL);
adm8668_parts[PART_LINUX].offset = 0x40000;
adm8668_parts[PART_LINUX].size = master->size - 0x40000;
adm8668_parts[PART_ROOTFS].name = kstrdup("rootfs", GFP_KERNEL);
adm8668_parts[PART_ROOTFS].offset = 0xe0000;
adm8668_parts[PART_ROOTFS].size = 0x140000;
adm8668_parts[PART_UBOOT_ENV].name = kstrdup("uboot_env", GFP_KERNEL);
adm8668_parts[PART_UBOOT_ENV].offset = 0x20000;
adm8668_parts[PART_UBOOT_ENV].size = 0x20000;
/* now find squashfs */
memset(&shdr, 0xe5, sizeof(shdr));
for (off = 0x40000; off < master->size; off += blocksize) {
/*
* Read into buffer
*/
if (mtd_read(master, off, sizeof(shdr), &len, (char *)&shdr) ||
len != sizeof(shdr))
continue;
if (shdr.s_magic == SQUASHFS_MAGIC) {
uint32_t fs_size = (uint32_t)shdr.bytes_used;
pr_info(PFX "filesystem type: squashfs, size=%dkB\n",
fs_size >> 10);
/*
* Update rootfs based on the superblock info, and
* stretch to end of MTD. rootfs_split will split it
*/
adm8668_parts[PART_ROOTFS].offset = off;
adm8668_parts[PART_ROOTFS].size = master->size -
adm8668_parts[PART_ROOTFS].offset;
/*
* kernel ends where rootfs starts
* but we'll keep it full-length for upgrades
*/
linux_len = adm8668_parts[PART_LINUX + 1].offset -
adm8668_parts[PART_LINUX].offset;
adm8668_parts[PART_LINUX].size = master->size -
adm8668_parts[PART_LINUX].offset;
goto found;
}
}
pr_err(PFX "could't find root filesystem\n");
return NR_PARTS;
found:
if (mtd_read(master, adm8668_parts[PART_LINUX].offset, sizeof(uhdr), &len, (char *)&uhdr) ||
len != sizeof(uhdr)) {
pr_err(PFX "failed to read u-boot header\n");
return NR_PARTS;
}
if (uhdr.ih_magic != IH_MAGIC) {
pr_info(PFX "invalid u-boot magic detected?!?!\n");
return NR_PARTS;
}
if (be32_to_cpu(uhdr.ih_size) != (linux_len - sizeof(uhdr))) {
u32 data;
size_t data_len = 0;
unsigned char *block;
unsigned int offset;
offset = adm8668_parts[PART_LINUX].offset +
sizeof(struct uboot_header);
pr_info(PFX "Updating U-boot image:\n");
pr_info(PFX " old: [size: %8d crc32: 0x%08x]\n",
be32_to_cpu(uhdr.ih_size), be32_to_cpu(uhdr.ih_dcrc));
if (mtd_read(master, offset, sizeof(data), &data_len, (char *)&data)) {
pr_err(PFX "failed to read data\n");
goto out;
}
/* Update the data length & crc32 */
uhdr.ih_size = cpu_to_be32(linux_len - sizeof(uhdr));
uhdr.ih_dcrc = crc32_le(~0, (char *)&data, linux_len - sizeof(uhdr)) ^ (~0);
uhdr.ih_dcrc = cpu_to_be32(uhdr.ih_dcrc);
pr_info(PFX " new: [size: %8d crc32: 0x%08x]\n",
be32_to_cpu(uhdr.ih_size), be32_to_cpu(uhdr.ih_dcrc));
/* update header's crc... */
uhdr.ih_hcrc = 0;
uhdr.ih_hcrc = crc32_le(~0, (unsigned char *)&uhdr,
sizeof(uhdr)) ^ (~0);
uhdr.ih_hcrc = cpu_to_be32(uhdr.ih_hcrc);
/* read first eraseblock from the image */
block = vmalloc(master->erasesize);
if (!block)
return -ENOMEM;
if (mtd_read(master, adm8668_parts[PART_LINUX].offset, master->erasesize, &len, block)
|| len != master->erasesize) {
pr_err(PFX "error copying first eraseblock\n");
return 0;
}
/* Write updated header to the flash */
memcpy(block, &uhdr, sizeof(uhdr));
if (master->unlock)
master->unlock(master, off, master->erasesize);
erase_info.mtd = master;
erase_info.addr = (uint64_t)adm8668_parts[PART_LINUX].offset;
erase_info.len = master->erasesize;
ret = mtd_erase(master, &erase_info);
if (!ret) {
if (mtd_write(master, adm8668_parts[PART_LINUX].offset, master->erasesize,
&len, block))
pr_err(PFX "write failed");
} else
pr_err(PFX "erase failed");
mtd_sync(master);
out:
if (block)
vfree(block);
pr_info(PFX "done\n");
}
*pparts = adm8668_parts;
return NR_PARTS;
}
static struct mtd_part_parser adm8668_parser = {
.owner = THIS_MODULE,
.parse_fn = adm8668_parse_partitions,
.name = "adm8668part",
};
static int __init adm8668_parser_init(void)
{
return register_mtd_parser(&adm8668_parser);
}
static void __exit adm8668_parser_exit(void)
{
deregister_mtd_parser(&adm8668_parser);
}
module_init(adm8668_parser_init);
module_exit(adm8668_parser_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Scott Nicholas <neutronscott@scottn.us>");
MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
MODULE_DESCRIPTION("MTD partition parser for ADM8668");
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