depends on MTD_SPLIT_SUPPORT
select MTD_SPLIT
+config MTD_SPLIT_CFE_BOOTFS
+ bool "Parser finding rootfs appended to the CFE bootfs"
+ depends on MTD_SPLIT_SUPPORT && ARCH_BCM4908
+ select MTD_SPLIT
+ help
+ cferom on BCM4908 (and bcm63xx) uses JFFS2 bootfs partition
+ for storing kernel, cferam and some device specific files.
+ There isn't any straight way of storing rootfs so it gets
+ appended to the JFFS2 bootfs partition. Kernel needs to find
+ it and run init from it. This parser is responsible for
+ finding appended rootfs.
+
config MTD_SPLIT_SEAMA_FW
bool "Seama firmware parser"
depends on MTD_SPLIT_SUPPORT
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2021 Rafał Miłecki <rafal@milecki.pl>
+ */
+
+#include <linux/init.h>
+#include <linux/jffs2.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+#include <linux/of.h>
+#include <linux/slab.h>
+
+#include "mtdsplit.h"
+
+#define je16_to_cpu(x) ((x).v16)
+#define je32_to_cpu(x) ((x).v32)
+
+#define NR_PARTS 1
+
+static int mtdsplit_cfe_bootfs_parse(struct mtd_info *mtd,
+ const struct mtd_partition **pparts,
+ struct mtd_part_parser_data *data)
+{
+ struct jffs2_raw_dirent node;
+ enum mtdsplit_part_type type;
+ struct mtd_partition *parts;
+ size_t rootfs_offset;
+ size_t retlen;
+ size_t offset;
+ int err;
+
+ /* Don't parse backup partitions */
+ if (strcmp(mtd->name, "firmware"))
+ return -EINVAL;
+
+ /* Find the end of JFFS2 bootfs partition */
+ offset = 0;
+ do {
+ err = mtd_read(mtd, offset, sizeof(node), &retlen, (void *)&node);
+ if (err || retlen != sizeof(node))
+ break;
+
+ if (je16_to_cpu(node.magic) != JFFS2_MAGIC_BITMASK)
+ break;
+
+ offset += je32_to_cpu(node.totlen);
+ offset = (offset + 0x3) & ~0x3;
+ } while (offset < mtd->size);
+
+ /* Find rootfs partition that follows the bootfs */
+ err = mtd_find_rootfs_from(mtd, mtd->erasesize, mtd->size, &rootfs_offset, &type);
+ if (err)
+ return err;
+
+ parts = kzalloc(NR_PARTS * sizeof(*parts), GFP_KERNEL);
+ if (!parts)
+ return -ENOMEM;
+
+ if (type == MTDSPLIT_PART_TYPE_UBI)
+ parts[0].name = UBI_PART_NAME;
+ else
+ parts[0].name = ROOTFS_PART_NAME;
+ parts[0].offset = rootfs_offset;
+ parts[0].size = mtd->size - rootfs_offset;
+
+ *pparts = parts;
+
+ return NR_PARTS;
+}
+
+static const struct of_device_id mtdsplit_cfe_bootfs_of_match_table[] = {
+ { .compatible = "brcm,bcm4908-firmware" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, mtdsplit_cfe_bootfs_of_match_table);
+
+static struct mtd_part_parser mtdsplit_cfe_bootfs_parser = {
+ .owner = THIS_MODULE,
+ .name = "cfe-bootfs",
+ .of_match_table = mtdsplit_cfe_bootfs_of_match_table,
+ .parse_fn = mtdsplit_cfe_bootfs_parse,
+};
+
+module_mtd_part_parser(mtdsplit_cfe_bootfs_parser);