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