242 lines
6.5 KiB
C
242 lines
6.5 KiB
C
/*
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* BCM63XX CFE image tag parser
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*
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* Copyright © 2006-2008 Florian Fainelli <florian@openwrt.org>
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* Mike Albon <malbon@openwrt.org>
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* Copyright © 2009-2010 Daniel Dickinson <openwrt@cshore.neomailbox.net>
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* Copyright © 2011-2012 Jonas Gorski <jonas.gorski@gmail.com>
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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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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/crc32.h>
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#include <linux/module.h>
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#include <linux/kernel.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 <asm/mach-bcm63xx/bcm963xx_tag.h>
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#include <asm/mach-bcm63xx/board_bcm963xx.h>
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#define BCM63XX_EXTENDED_SIZE 0xBFC00000 /* Extended flash address */
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#define BCM63XX_MIN_CFE_SIZE 0x10000 /* always at least 64KiB */
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#define BCM63XX_MIN_NVRAM_SIZE 0x10000 /* always at least 64KiB */
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#define BCM63XX_CFE_MAGIC_OFFSET 0x4e0
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static int bcm63xx_detect_cfe(struct mtd_info *master)
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{
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char buf[9];
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int ret;
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size_t retlen;
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ret = mtd_read(master, BCM963XX_CFE_VERSION_OFFSET, 5, &retlen,
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(void *)buf);
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buf[retlen] = 0;
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if (ret)
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return ret;
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if (strncmp("cfe-v", buf, 5) == 0)
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return 0;
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/* very old CFE's do not have the cfe-v string, so check for magic */
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ret = mtd_read(master, BCM63XX_CFE_MAGIC_OFFSET, 8, &retlen,
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(void *)buf);
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buf[retlen] = 0;
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return strncmp("CFE1CFE1", buf, 8);
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}
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static int bcm63xx_parse_cfe_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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/* CFE, NVRAM and global Linux are always present */
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int nrparts = 3, curpart = 0;
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struct bcm_tag *buf;
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struct mtd_partition *parts;
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int ret;
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size_t retlen;
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unsigned int rootfsaddr, kerneladdr, spareaddr;
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unsigned int rootfslen, kernellen, sparelen, totallen;
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unsigned int cfelen, nvramlen;
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int namelen = 0;
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int i;
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u32 computed_crc;
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bool rootfs_first = false;
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if (bcm63xx_detect_cfe(master))
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return -EINVAL;
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cfelen = max_t(uint32_t, master->erasesize, BCM63XX_MIN_CFE_SIZE);
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nvramlen = max_t(uint32_t, master->erasesize, BCM63XX_MIN_NVRAM_SIZE);
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/* Allocate memory for buffer */
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buf = vmalloc(sizeof(struct bcm_tag));
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if (!buf)
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return -ENOMEM;
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/* Get the tag */
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ret = mtd_read(master, cfelen, sizeof(struct bcm_tag), &retlen,
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(void *)buf);
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if (retlen != sizeof(struct bcm_tag)) {
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vfree(buf);
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return -EIO;
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}
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computed_crc = crc32_le(IMAGETAG_CRC_START, (u8 *)buf,
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offsetof(struct bcm_tag, header_crc));
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if (computed_crc == buf->header_crc) {
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char *boardid = &(buf->board_id[0]);
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char *tagversion = &(buf->tag_version[0]);
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sscanf(buf->flash_image_start, "%u", &rootfsaddr);
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sscanf(buf->kernel_address, "%u", &kerneladdr);
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sscanf(buf->kernel_length, "%u", &kernellen);
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sscanf(buf->total_length, "%u", &totallen);
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pr_info("CFE boot tag found with version %s and board type %s\n",
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tagversion, boardid);
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kerneladdr = kerneladdr - BCM63XX_EXTENDED_SIZE;
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rootfsaddr = rootfsaddr - BCM63XX_EXTENDED_SIZE;
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spareaddr = roundup(totallen, master->erasesize) + cfelen;
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sparelen = master->size - spareaddr - nvramlen;
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if (rootfsaddr < kerneladdr) {
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/* default Broadcom layout */
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rootfslen = kerneladdr - rootfsaddr;
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rootfs_first = true;
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} else {
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/* OpenWrt layout */
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rootfsaddr = kerneladdr + kernellen;
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rootfslen = spareaddr - rootfsaddr;
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}
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} else {
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pr_warn("CFE boot tag CRC invalid (expected %08x, actual %08x)\n",
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buf->header_crc, computed_crc);
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kernellen = 0;
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rootfslen = 0;
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rootfsaddr = 0;
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spareaddr = cfelen;
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sparelen = master->size - cfelen - nvramlen;
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}
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/* Determine number of partitions */
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namelen = 8;
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if (rootfslen > 0) {
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nrparts++;
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namelen += 6;
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}
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if (kernellen > 0) {
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nrparts++;
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namelen += 6;
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}
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/* Ask kernel for more memory */
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parts = kzalloc(sizeof(*parts) * nrparts + 10 * nrparts, GFP_KERNEL);
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if (!parts) {
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vfree(buf);
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return -ENOMEM;
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}
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/* Start building partition list */
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parts[curpart].name = "CFE";
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parts[curpart].offset = 0;
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parts[curpart].size = cfelen;
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curpart++;
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if (kernellen > 0) {
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int kernelpart = curpart;
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if (rootfslen > 0 && rootfs_first)
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kernelpart++;
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parts[kernelpart].name = "kernel";
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parts[kernelpart].offset = kerneladdr;
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parts[kernelpart].size = kernellen;
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curpart++;
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}
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if (rootfslen > 0) {
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int rootfspart = curpart;
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if (kernellen > 0 && rootfs_first)
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rootfspart--;
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parts[rootfspart].name = "rootfs";
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parts[rootfspart].offset = rootfsaddr;
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parts[rootfspart].size = rootfslen;
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if (sparelen > 0 && !rootfs_first)
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parts[rootfspart].size += sparelen;
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curpart++;
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}
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parts[curpart].name = "nvram";
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parts[curpart].offset = master->size - nvramlen;
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parts[curpart].size = nvramlen;
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/* Global partition "linux" to make easy firmware upgrade */
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curpart++;
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parts[curpart].name = "linux";
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parts[curpart].offset = cfelen;
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parts[curpart].size = master->size - cfelen - nvramlen;
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for (i = 0; i < nrparts; i++)
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pr_info("Partition %d is %s offset %lx and length %lx\n", i,
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parts[i].name, (long unsigned int)(parts[i].offset),
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(long unsigned int)(parts[i].size));
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pr_info("Spare partition is offset %x and length %x\n", spareaddr,
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sparelen);
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*pparts = parts;
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vfree(buf);
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return nrparts;
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};
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static struct mtd_part_parser bcm63xx_cfe_parser = {
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.owner = THIS_MODULE,
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.parse_fn = bcm63xx_parse_cfe_partitions,
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.name = "bcm63xxpart",
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};
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static int __init bcm63xx_cfe_parser_init(void)
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{
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return register_mtd_parser(&bcm63xx_cfe_parser);
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}
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static void __exit bcm63xx_cfe_parser_exit(void)
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{
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deregister_mtd_parser(&bcm63xx_cfe_parser);
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}
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module_init(bcm63xx_cfe_parser_init);
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module_exit(bcm63xx_cfe_parser_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Daniel Dickinson <openwrt@cshore.neomailbox.net>");
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MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
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MODULE_AUTHOR("Mike Albon <malbon@openwrt.org>");
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MODULE_AUTHOR("Jonas Gorski <jonas.gorski@gmail.com");
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MODULE_DESCRIPTION("MTD partitioning for BCM63XX CFE bootloaders");
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