From 4153c0adff074167f1eb934235129471d2c04199 Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@openwrt.org>
Date: Fri, 2 Jan 2015 21:52:35 +0000
Subject: kernel: move mtdsplit files to drivers/mtd/mtdsplit/ to simplify
maintenance, unify patches across kernel versions
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
SVN-Revision: 43805
---
.../files/drivers/mtd/mtdsplit/mtdsplit_seama.c | 103 +++++++++++++++++++++
1 file changed, 103 insertions(+)
create mode 100644 target/linux/generic/files/drivers/mtd/mtdsplit/mtdsplit_seama.c
(limited to 'target/linux/generic/files/drivers/mtd/mtdsplit/mtdsplit_seama.c')
diff --git a/target/linux/generic/files/drivers/mtd/mtdsplit/mtdsplit_seama.c b/target/linux/generic/files/drivers/mtd/mtdsplit/mtdsplit_seama.c
new file mode 100644
index 0000000..6f21f8f
--- /dev/null
+++ b/target/linux/generic/files/drivers/mtd/mtdsplit/mtdsplit_seama.c
@@ -0,0 +1,103 @@
+/*
+ * Copyright (C) 2013 Gabor Juhos <juhosg@openwrt.org>
+ *
+ * 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 SEAMA_MAGIC 0x5EA3A417
+#define SEAMA_NR_PARTS 2
+#define SEAMA_MIN_ROOTFS_OFFS 0x80000 /* 512KiB */
+
+struct seama_header {
+ __be32 magic; /* should always be SEAMA_MAGIC. */
+ __be16 reserved; /* reserved for */
+ __be16 metasize; /* size of the META data */
+ __be32 size; /* size of the image */
+};
+
+static int mtdsplit_parse_seama(struct mtd_info *master,
+ struct mtd_partition **pparts,
+ struct mtd_part_parser_data *data)
+{
+ struct seama_header hdr;
+ size_t hdr_len, retlen, kernel_size;
+ size_t rootfs_offset;
+ struct mtd_partition *parts;
+ int err;
+
+ hdr_len = sizeof(hdr);
+ err = mtd_read(master, 0, hdr_len, &retlen, (void *) &hdr);
+ if (err)
+ return err;
+
+ if (retlen != hdr_len)
+ return -EIO;
+
+ /* sanity checks */
+ if (be32_to_cpu(hdr.magic) != SEAMA_MAGIC)
+ return -EINVAL;
+
+ kernel_size = hdr_len + be32_to_cpu(hdr.size) +
+ be16_to_cpu(hdr.metasize);
+ if (kernel_size > master->size)
+ return -EINVAL;
+
+ /* Find the rootfs after the kernel. */
+ err = mtd_check_rootfs_magic(master, kernel_size);
+ if (!err) {
+ rootfs_offset = kernel_size;
+ } else {
+ /*
+ * The size in the header might cover the rootfs as well.
+ * Start the search from an arbitrary offset.
+ */
+ err = mtd_find_rootfs_from(master, SEAMA_MIN_ROOTFS_OFFS,
+ master->size, &rootfs_offset);
+ if (err)
+ return err;
+ }
+
+ parts = kzalloc(SEAMA_NR_PARTS * sizeof(*parts), GFP_KERNEL);
+ if (!parts)
+ return -ENOMEM;
+
+ parts[0].name = KERNEL_PART_NAME;
+ parts[0].offset = 0;
+ parts[0].size = rootfs_offset;
+
+ parts[1].name = ROOTFS_PART_NAME;
+ parts[1].offset = rootfs_offset;
+ parts[1].size = master->size - rootfs_offset;
+
+ *pparts = parts;
+ return SEAMA_NR_PARTS;
+}
+
+static struct mtd_part_parser mtdsplit_seama_parser = {
+ .owner = THIS_MODULE,
+ .name = "seama-fw",
+ .parse_fn = mtdsplit_parse_seama,
+ .type = MTD_PARSER_TYPE_FIRMWARE,
+};
+
+static int __init mtdsplit_seama_init(void)
+{
+ register_mtd_parser(&mtdsplit_seama_parser);
+
+ return 0;
+}
+
+subsys_initcall(mtdsplit_seama_init);
--
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