xref: /openbmc/u-boot/fs/ext4/dev.c (revision 4b684a6b)
1 /*
2  * (C) Copyright 2011 - 2012 Samsung Electronics
3  * EXT4 filesystem implementation in Uboot by
4  * Uma Shankar <uma.shankar@samsung.com>
5  * Manjunatha C Achar <a.manjunatha@samsung.com>
6  *
7  * made from existing ext2/dev.c file of Uboot
8  * (C) Copyright 2004
9  * esd gmbh <www.esd-electronics.com>
10  * Reinhard Arlt <reinhard.arlt@esd-electronics.com>
11  *
12  * based on code of fs/reiserfs/dev.c by
13  *
14  * (C) Copyright 2003 - 2004
15  * Sysgo AG, <www.elinos.com>, Pavel Bartusek <pba@sysgo.com>
16  *
17  * SPDX-License-Identifier:	GPL-2.0+
18  */
19 
20 /*
21  * Changelog:
22  *	0.1 - Newly created file for ext4fs support. Taken from
23  *		fs/ext2/dev.c file in uboot.
24  */
25 
26 #include <common.h>
27 #include <blk.h>
28 #include <config.h>
29 #include <fs_internal.h>
30 #include <ext4fs.h>
31 #include <ext_common.h>
32 #include "ext4_common.h"
33 
34 lbaint_t part_offset;
35 
36 static struct blk_desc *ext4fs_blk_desc;
37 static disk_partition_t *part_info;
38 
39 void ext4fs_set_blk_dev(struct blk_desc *rbdd, disk_partition_t *info)
40 {
41 	assert(rbdd->blksz == (1 << rbdd->log2blksz));
42 	ext4fs_blk_desc = rbdd;
43 	get_fs()->dev_desc = rbdd;
44 	part_info = info;
45 	part_offset = info->start;
46 	get_fs()->total_sect = ((uint64_t)info->size * info->blksz) >>
47 		get_fs()->dev_desc->log2blksz;
48 }
49 
50 int ext4fs_devread(lbaint_t sector, int byte_offset, int byte_len,
51 		   char *buffer)
52 {
53 	return fs_devread(get_fs()->dev_desc, part_info, sector, byte_offset,
54 			  byte_len, buffer);
55 }
56 
57 int ext4_read_superblock(char *buffer)
58 {
59 	struct ext_filesystem *fs = get_fs();
60 	int sect = SUPERBLOCK_START >> fs->dev_desc->log2blksz;
61 	int off = SUPERBLOCK_START % fs->dev_desc->blksz;
62 
63 	return ext4fs_devread(sect, off, SUPERBLOCK_SIZE,
64 				buffer);
65 }
66