diff options
Diffstat (limited to 'drivers/mtd/bcm63xxpart.c')
| -rw-r--r-- | drivers/mtd/bcm63xxpart.c | 222 |
1 files changed, 222 insertions, 0 deletions
diff --git a/drivers/mtd/bcm63xxpart.c b/drivers/mtd/bcm63xxpart.c new file mode 100644 index 000000000000..608321ee056e --- /dev/null +++ b/drivers/mtd/bcm63xxpart.c @@ -0,0 +1,222 @@ +/* + * 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 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; + + 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->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 = kerneladdr + kernellen; + spareaddr = roundup(totallen, master->erasesize) + cfelen; + sparelen = master->size - spareaddr - nvramlen; + 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) { + parts[curpart].name = "kernel"; + parts[curpart].offset = kerneladdr; + parts[curpart].size = kernellen; + curpart++; + } + + if (rootfslen > 0) { + parts[curpart].name = "rootfs"; + parts[curpart].offset = rootfsaddr; + parts[curpart].size = rootfslen; + if (sparelen > 0) + parts[curpart].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"); |