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