--- /dev/null
+/*
+ * Firmware MTD split for BCM63XX, based on bcm63xxpart.c
+ *
+ * Copyright (C) 2006-2008 Florian Fainelli <florian@openwrt.org>
+ * Copyright (C) 2006-2008 Mike Albon <malbon@openwrt.org>
+ * Copyright (C) 2009-2010 Daniel Dickinson <openwrt@cshore.neomailbox.net>
+ * Copyright (C) 2011-2013 Jonas Gorski <jonas.gorski@gmail.com>
+ * Copyright (C) 2015 Simon Arlott <simon@fire.lp0.eu>
+ * Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/bcm963xx_tag.h>
+#include <linux/crc32.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/byteorder/generic.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+
+#include "mtdsplit.h"
+
+/* 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)
+
+#define BCM63XX_NR_PARTS 2
+
+static int bcm63xx_read_image_tag(struct mtd_info *master, loff_t offset,
+ struct bcm_tag *hdr)
+{
+ int ret;
+ size_t retlen;
+ u32 computed_crc;
+
+ ret = mtd_read(master, offset, sizeof(*hdr), &retlen, (void *) hdr);
+ if (ret)
+ return ret;
+
+ if (retlen != sizeof(*hdr))
+ return -EIO;
+
+ computed_crc = crc32_le(IMAGETAG_CRC_START, (u8 *)hdr,
+ offsetof(struct bcm_tag, header_crc));
+ if (computed_crc == hdr->header_crc) {
+ STR_NULL_TERMINATE(hdr->board_id);
+ STR_NULL_TERMINATE(hdr->tag_version);
+
+ pr_info("CFE image tag found at 0x%llx with version %s, "
+ "board type %s\n", offset, hdr->tag_version,
+ hdr->board_id);
+
+ return 0;
+ } else {
+ pr_debug("CFE image tag at 0x%llx CRC invalid "
+ "(expected %08x, actual %08x)\n",
+ offset, hdr->header_crc, computed_crc);
+
+ return 1;
+ }
+}
+
+static int bcm63xx_parse_partitions(struct mtd_info *master,
+ const struct mtd_partition **pparts,
+ struct bcm_tag *hdr)
+{
+ struct mtd_partition *parts;
+ unsigned int flash_image_start;
+ unsigned int kernel_address;
+ unsigned int kernel_length;
+ size_t kernel_offset = 0, kernel_size = 0;
+ size_t rootfs_offset = 0, rootfs_size = 0;
+ int kernel_part, rootfs_part;
+
+ STR_NULL_TERMINATE(hdr->flash_image_start);
+ if (kstrtouint(hdr->flash_image_start, 10, &flash_image_start) ||
+ flash_image_start < BCM963XX_EXTENDED_SIZE) {
+ pr_err("invalid rootfs address: %*ph\n",
+ (int) sizeof(hdr->flash_image_start),
+ hdr->flash_image_start);
+ return -EINVAL;
+ }
+
+ STR_NULL_TERMINATE(hdr->kernel_address);
+ if (kstrtouint(hdr->kernel_address, 10, &kernel_address) ||
+ kernel_address < BCM963XX_EXTENDED_SIZE) {
+ pr_err("invalid kernel address: %*ph\n",
+ (int) sizeof(hdr->kernel_address), hdr->kernel_address);
+ return -EINVAL;
+ }
+
+ STR_NULL_TERMINATE(hdr->kernel_length);
+ if (kstrtouint(hdr->kernel_length, 10, &kernel_length) ||
+ !kernel_length) {
+ pr_err("invalid kernel length: %*ph\n",
+ (int) sizeof(hdr->kernel_length), hdr->kernel_length);
+ return -EINVAL;
+ }
+
+ kernel_offset = kernel_address - BCM963XX_EXTENDED_SIZE -
+ mtdpart_get_offset(master);
+ kernel_size = kernel_length;
+
+ if (flash_image_start < kernel_address) {
+ /* rootfs first */
+ rootfs_part = 0;
+ kernel_part = 1;
+ rootfs_offset = flash_image_start - BCM963XX_EXTENDED_SIZE -
+ mtdpart_get_offset(master);
+ rootfs_size = kernel_offset - rootfs_offset;
+ } else {
+ /* kernel first */
+ kernel_part = 0;
+ rootfs_part = 1;
+ rootfs_offset = kernel_offset + kernel_size;
+ rootfs_size = master->size - rootfs_offset;
+ }
+
+ if (mtd_check_rootfs_magic(master, rootfs_offset, NULL))
+ pr_warn("rootfs magic not found\n");
+
+ parts = kzalloc(BCM63XX_NR_PARTS * sizeof(*parts), GFP_KERNEL);
+ if (!parts)
+ return -ENOMEM;
+
+ parts[kernel_part].name = KERNEL_PART_NAME;
+ parts[kernel_part].offset = kernel_offset;
+ parts[kernel_part].size = kernel_size;
+
+ parts[rootfs_part].name = ROOTFS_PART_NAME;
+ parts[rootfs_part].offset = rootfs_offset;
+ parts[rootfs_part].size = rootfs_size;
+
+ *pparts = parts;
+ return BCM63XX_NR_PARTS;
+}
+
+static int mtdsplit_parse_bcm63xx(struct mtd_info *master,
+ const struct mtd_partition **pparts,
+ struct mtd_part_parser_data *data)
+{
+ struct bcm_tag hdr;
+ loff_t offset;
+
+ if (mtd_type_is_nand(master))
+ return -EINVAL;
+
+ /* find bcm63xx_cfe image on erase block boundaries */
+ for (offset = 0; offset < master->size; offset += master->erasesize) {
+ if (!bcm63xx_read_image_tag(master, offset, (void *) &hdr))
+ return bcm63xx_parse_partitions(master, pparts,
+ (void *) &hdr);
+ }
+
+ return -EINVAL;
+}
+
+static struct mtd_part_parser mtdsplit_bcm63xx_parser = {
+ .owner = THIS_MODULE,
+ .name = "bcm63xx-fw",
+ .parse_fn = mtdsplit_parse_bcm63xx,
+ .type = MTD_PARSER_TYPE_FIRMWARE,
+};
+
+static int __init mtdsplit_bcm63xx_init(void)
+{
+ register_mtd_parser(&mtdsplit_bcm63xx_parser);
+
+ return 0;
+}
+
+module_init(mtdsplit_bcm63xx_init);
projects / openwrt / staging / noltari.git / commitdiff