/* * BCM63XX CFE image tag parser * * Copyright © 2006-2008 Florian Fainelli * Mike Albon * Copyright © 2009-2010 Daniel Dickinson * Copyright © 2011-2013 Jonas Gorski * * 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 #include #include #include #include #include #include #include #include #include #define BCM963XX_CFE_BLOCK_SIZE SZ_64K /* always at least 64KiB */ #define BCM963XX_CFE_MAGIC_OFFSET 0x4e0 #define BCM963XX_CFE_VERSION_OFFSET 0x570 #define BCM963XX_NVRAM_OFFSET 0x580 /* Ensure strings read from flash structs are null terminated */ #define STR_NULL_TERMINATE(x) \ do { char *_str = (x); _str[sizeof(x) - 1] = 0; } while (0) 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, BCM963XX_CFE_MAGIC_OFFSET, 8, &retlen, (void *)buf); buf[retlen] = 0; return strncmp("CFE1CFE1", buf, 8); } static int bcm63xx_read_nvram(struct mtd_info *master, struct bcm963xx_nvram *nvram) { u32 actual_crc, expected_crc; size_t retlen; int ret; /* extract nvram data */ ret = mtd_read(master, BCM963XX_NVRAM_OFFSET, BCM963XX_NVRAM_V5_SIZE, &retlen, (void *)nvram); if (ret) return ret; ret = bcm963xx_nvram_checksum(nvram, &expected_crc, &actual_crc); if (ret) pr_warn("nvram checksum failed, contents may be invalid (expected %08x, got %08x)\n", expected_crc, actual_crc); if (!nvram->psi_size) nvram->psi_size = BCM963XX_DEFAULT_PSI_SIZE; return 0; } static int bcm63xx_read_image_tag(struct mtd_info *master, const char *name, loff_t tag_offset, struct bcm_tag *buf) { int ret; size_t retlen; u32 computed_crc; ret = mtd_read(master, tag_offset, sizeof(*buf), &retlen, (void *)buf); if (ret) return ret; if (retlen != sizeof(*buf)) return -EIO; computed_crc = crc32_le(IMAGETAG_CRC_START, (u8 *)buf, offsetof(struct bcm_tag, header_crc)); if (computed_crc == buf->header_crc) { STR_NULL_TERMINATE(buf->board_id); STR_NULL_TERMINATE(buf->tag_version); pr_info("%s: CFE image tag found at 0x%llx with version %s, board type %s\n", name, tag_offset, buf->tag_version, buf->board_id); return 0; } pr_warn("%s: CFE image tag at 0x%llx CRC invalid (expected %08x, actual %08x)\n", name, tag_offset, buf->header_crc, computed_crc); return 1; } static int bcm63xx_parse_cfe_nor_partitions(struct mtd_info *master, const struct mtd_partition **pparts, struct bcm963xx_nvram *nvram) { /* CFE, NVRAM and global Linux are always present */ int nrparts = 3, curpart = 0; struct bcm_tag *buf = NULL; struct mtd_partition *parts; int ret; unsigned int rootfsaddr, kerneladdr, spareaddr; unsigned int rootfslen, kernellen, sparelen, totallen; unsigned int cfelen, nvramlen; unsigned int cfe_erasesize; int i; bool rootfs_first = false; cfe_erasesize = max_t(uint32_t, master->erasesize, BCM963XX_CFE_BLOCK_SIZE); cfelen = cfe_erasesize; nvramlen = nvram->psi_size * SZ_1K; nvramlen = roundup(nvramlen, cfe_erasesize); buf = vmalloc(sizeof(struct bcm_tag)); if (!buf) return -ENOMEM; /* Get the tag */ ret = bcm63xx_read_image_tag(master, "rootfs", cfelen, buf); if (!ret) { STR_NULL_TERMINATE(buf->flash_image_start); if (kstrtouint(buf->flash_image_start, 10, &rootfsaddr) || rootfsaddr < BCM963XX_EXTENDED_SIZE) { pr_err("invalid rootfs address: %*ph\n", sizeof(buf->flash_image_start), buf->flash_image_start); goto invalid_tag; } STR_NULL_TERMINATE(buf->kernel_address); if (kstrtouint(buf->kernel_address, 10, &kerneladdr) || kerneladdr < BCM963XX_EXTENDED_SIZE) { pr_err("invalid kernel address: %*ph\n", sizeof(buf->kernel_address), buf->kernel_address); goto invalid_tag; } STR_NULL_TERMINATE(buf->kernel_length); if (kstrtouint(buf->kernel_length, 10, &kernellen)) { pr_err("invalid kernel length: %*ph\n", sizeof(buf->kernel_length), buf->kernel_length); goto invalid_tag; } STR_NULL_TERMINATE(buf->total_length); if (kstrtouint(buf->total_length, 10, &totallen)) { pr_err("invalid total length: %*ph\n", sizeof(buf->total_length), buf->total_length); goto invalid_tag; } kerneladdr = kerneladdr - BCM963XX_EXTENDED_SIZE; rootfsaddr = rootfsaddr - BCM963XX_EXTENDED_SIZE; spareaddr = roundup(totallen, master->erasesize) + cfelen; if (rootfsaddr < kerneladdr) { /* default Broadcom layout */ rootfslen = kerneladdr - rootfsaddr; rootfs_first = true; } else { /* OpenWrt layout */ rootfsaddr = kerneladdr + kernellen; rootfslen = spareaddr - rootfsaddr; } } else if (ret > 0) { invalid_tag: kernellen = 0; rootfslen = 0; rootfsaddr = 0; spareaddr = cfelen; } else { goto out; } sparelen = master->size - spareaddr - nvramlen; /* Determine number of partitions */ if (rootfslen > 0) nrparts++; if (kernellen > 0) nrparts++; parts = kzalloc(sizeof(*parts) * nrparts + 10 * nrparts, GFP_KERNEL); if (!parts) { ret = -ENOMEM; goto out; } /* 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; curpart++; /* Global partition "linux" to make easy firmware upgrade */ 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 %llx and length %llx\n", i, parts[i].name, parts[i].offset, parts[i].size); pr_info("Spare partition is offset %x and length %x\n", spareaddr, sparelen); *pparts = parts; ret = 0; out: vfree(buf); if (ret) return ret; return nrparts; } static int bcm63xx_parse_cfe_partitions(struct mtd_info *master, const struct mtd_partition **pparts, struct mtd_part_parser_data *data) { struct bcm963xx_nvram *nvram = NULL; int ret; if (bcm63xx_detect_cfe(master)) return -EINVAL; nvram = vzalloc(sizeof(*nvram)); if (!nvram) return -ENOMEM; ret = bcm63xx_read_nvram(master, nvram); if (ret) goto out; if (!mtd_type_is_nand(master)) ret = bcm63xx_parse_cfe_nor_partitions(master, pparts, nvram); else ret = -EINVAL; out: vfree(nvram); return ret; }; static struct mtd_part_parser bcm63xx_cfe_parser = { .parse_fn = bcm63xx_parse_cfe_partitions, .name = "bcm63xxpart", }; module_mtd_part_parser(bcm63xx_cfe_parser); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Daniel Dickinson "); MODULE_AUTHOR("Florian Fainelli "); MODULE_AUTHOR("Mike Albon "); MODULE_AUTHOR("Jonas Gorski