--- /dev/null
+/*
+ * Copyright (C) 2012 John Crispin <blogic@openwrt.org>
+ * Copyright (C) 2015 Martin Blumenstingl <martin.blumenstingl@googlemail.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.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+#include <linux/byteorder/generic.h>
+
+#include "mtdsplit.h"
+
+#define EVA_NR_PARTS 2
+#define EVA_MAGIC 0xfeed1281
+#define EVA_FOOTER_SIZE 0x18
+#define EVA_DUMMY_SQUASHFS_SIZE 0x100
+
+struct eva_image_header {
+ uint32_t magic;
+ uint32_t size;
+};
+
+static int mtdsplit_parse_eva(struct mtd_info *master,
+ struct mtd_partition **pparts,
+ struct mtd_part_parser_data *data)
+{
+ struct mtd_partition *parts;
+ struct eva_image_header hdr;
+ size_t retlen;
+ unsigned long kernel_size, rootfs_offset;
+ int err;
+
+ err = mtd_read(master, 0, sizeof(hdr), &retlen, (void *) &hdr);
+ if (err)
+ return err;
+
+ if (retlen != sizeof(hdr))
+ return -EIO;
+
+ if (le32_to_cpu(hdr.magic) != EVA_MAGIC)
+ return -EINVAL;
+
+ kernel_size = le32_to_cpu(hdr.size) + EVA_FOOTER_SIZE;
+
+ /* rootfs starts at the next 0x10000 boundary: */
+ rootfs_offset = round_up(kernel_size, 0x10000);
+
+ /* skip the dummy EVA squashfs partition (with wrong endianness): */
+ rootfs_offset += EVA_DUMMY_SQUASHFS_SIZE;
+
+ if (rootfs_offset >= master->size)
+ return -EINVAL;
+
+ err = mtd_check_rootfs_magic(master, rootfs_offset);
+ if (err)
+ return err;
+
+ parts = kzalloc(EVA_NR_PARTS * sizeof(*parts), GFP_KERNEL);
+ if (!parts)
+ return -ENOMEM;
+
+ parts[0].name = KERNEL_PART_NAME;
+ parts[0].offset = 0;
+ parts[0].size = kernel_size;
+
+ parts[1].name = ROOTFS_PART_NAME;
+ parts[1].offset = rootfs_offset;
+ parts[1].size = master->size - rootfs_offset;
+
+ *pparts = parts;
+ return EVA_NR_PARTS;
+}
+
+static struct mtd_part_parser mtdsplit_eva_parser = {
+ .owner = THIS_MODULE,
+ .name = "eva-fw",
+ .parse_fn = mtdsplit_parse_eva,
+ .type = MTD_PARSER_TYPE_FIRMWARE,
+};
+
+static int __init mtdsplit_eva_init(void)
+{
+ register_mtd_parser(&mtdsplit_eva_parser);
+
+ return 0;
+}
+
+subsys_initcall(mtdsplit_eva_init);
projects / openwrt / staging / dedeckeh.git / commitdiff