From ae51f41d14f548d494ac41e0d21137c5a4c3f59c Mon Sep 17 00:00:00 2001
From: Iru Cai <mytbk920423@gmail.com>
Date: Wed, 30 Oct 2019 14:21:52 +0800
Subject: import the U-Boot code and make it compile

---
 dev.c | 64 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 dev.c

(limited to 'dev.c')

diff --git a/dev.c b/dev.c
new file mode 100644
index 0000000..2907688
--- /dev/null
+++ b/dev.c
@@ -0,0 +1,64 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2011 - 2012 Samsung Electronics
+ * EXT4 filesystem implementation in Uboot by
+ * Uma Shankar <uma.shankar@samsung.com>
+ * Manjunatha C Achar <a.manjunatha@samsung.com>
+ *
+ * made from existing ext2/dev.c file of Uboot
+ * (C) Copyright 2004
+ * esd gmbh <www.esd-electronics.com>
+ * Reinhard Arlt <reinhard.arlt@esd-electronics.com>
+ *
+ * based on code of fs/reiserfs/dev.c by
+ *
+ * (C) Copyright 2003 - 2004
+ * Sysgo AG, <www.elinos.com>, Pavel Bartusek <pba@sysgo.com>
+ */
+
+/*
+ * Changelog:
+ *	0.1 - Newly created file for ext4fs support. Taken from
+ *		fs/ext2/dev.c file in uboot.
+ */
+
+#include <common.h>
+#include <blk.h>
+#include <config.h>
+#include <fs_internal.h>
+#include <ext4fs.h>
+#include <ext_common.h>
+#include "ext4_common.h"
+
+lbaint_t part_offset;
+
+static struct blk_desc *ext4fs_blk_desc;
+static disk_partition_t *part_info;
+
+void ext4fs_set_blk_dev(struct blk_desc *rbdd, disk_partition_t *info)
+{
+	assert(rbdd->blksz == (1 << rbdd->log2blksz));
+	ext4fs_blk_desc = rbdd;
+	get_fs()->dev_desc = rbdd;
+	part_info = info;
+	part_offset = info->start;
+	get_fs()->total_sect = ((uint64_t)info->size * info->blksz) >>
+		get_fs()->dev_desc->log2blksz;
+}
+
+int ext4fs_devread(lbaint_t sector, int byte_offset, int byte_len,
+		   char *buffer)
+{
+	return fs_devread(get_fs()->dev_desc, part_info, sector, byte_offset,
+			  byte_len, buffer);
+}
+
+int ext4_read_superblock(char *buffer)
+{
+	struct ext_filesystem *fs = get_fs();
+	int sect = SUPERBLOCK_START >> fs->dev_desc->log2blksz;
+	int off = SUPERBLOCK_START % fs->dev_desc->blksz;
+
+	return ext4fs_devread(sect, off, SUPERBLOCK_SIZE,
+				buffer);
+}
-- 
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