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a1596438 US |
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 | * This program is free software; you can redistribute it and/or modify | |
18 | * it under the terms of the GNU General Public License as published by | |
19 | * the Free Software Foundation; either version 2 of the License, or | |
20 | * (at your option) any later version. | |
21 | * | |
22 | * This program is distributed in the hope that it will be useful, | |
23 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
24 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
25 | * GNU General Public License for more details. | |
26 | * | |
27 | * You should have received a copy of the GNU General Public License | |
28 | * along with this program; if not, write to the Free Software | |
29 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
30 | * | |
31 | */ | |
32 | ||
33 | /* | |
34 | * Changelog: | |
35 | * 0.1 - Newly created file for ext4fs support. Taken from | |
36 | * fs/ext2/dev.c file in uboot. | |
37 | */ | |
38 | ||
39 | #include <common.h> | |
40 | #include <config.h> | |
81180819 | 41 | #include <ext4fs.h> |
a1596438 US |
42 | #include <ext_common.h> |
43 | ||
81180819 RH |
44 | unsigned long part_offset; |
45 | ||
a1596438 | 46 | static block_dev_desc_t *ext4fs_block_dev_desc; |
81180819 | 47 | static disk_partition_t *part_info; |
a1596438 | 48 | |
81180819 | 49 | void ext4fs_set_blk_dev(block_dev_desc_t *rbdd, disk_partition_t *info) |
a1596438 US |
50 | { |
51 | ext4fs_block_dev_desc = rbdd; | |
81180819 RH |
52 | part_info = info; |
53 | part_offset = info->start; | |
54 | get_fs()->total_sect = (info->size * info->blksz) / SECTOR_SIZE; | |
a1f41f1a | 55 | get_fs()->dev_desc = rbdd; |
a1596438 US |
56 | } |
57 | ||
58 | int ext4fs_devread(int sector, int byte_offset, int byte_len, char *buf) | |
59 | { | |
55b523b7 | 60 | ALLOC_CACHE_ALIGN_BUFFER(char, sec_buf, SECTOR_SIZE); |
a1596438 US |
61 | unsigned block_len; |
62 | ||
63 | /* Check partition boundaries */ | |
64 | if ((sector < 0) | |
65 | || ((sector + ((byte_offset + byte_len - 1) >> SECTOR_BITS)) >= | |
81180819 | 66 | part_info->size)) { |
a1596438 US |
67 | printf("%s read outside partition %d\n", __func__, sector); |
68 | return 0; | |
69 | } | |
70 | ||
71 | /* Get the read to the beginning of a partition */ | |
72 | sector += byte_offset >> SECTOR_BITS; | |
73 | byte_offset &= SECTOR_SIZE - 1; | |
74 | ||
75 | debug(" <%d, %d, %d>\n", sector, byte_offset, byte_len); | |
76 | ||
77 | if (ext4fs_block_dev_desc == NULL) { | |
78 | printf("** Invalid Block Device Descriptor (NULL)\n"); | |
79 | return 0; | |
80 | } | |
81 | ||
82 | if (byte_offset != 0) { | |
83 | /* read first part which isn't aligned with start of sector */ | |
84 | if (ext4fs_block_dev_desc-> | |
85 | block_read(ext4fs_block_dev_desc->dev, | |
81180819 | 86 | part_info->start + sector, 1, |
a1596438 US |
87 | (unsigned long *) sec_buf) != 1) { |
88 | printf(" ** ext2fs_devread() read error **\n"); | |
89 | return 0; | |
90 | } | |
91 | memcpy(buf, sec_buf + byte_offset, | |
92 | min(SECTOR_SIZE - byte_offset, byte_len)); | |
93 | buf += min(SECTOR_SIZE - byte_offset, byte_len); | |
94 | byte_len -= min(SECTOR_SIZE - byte_offset, byte_len); | |
95 | sector++; | |
96 | } | |
97 | ||
98 | if (byte_len == 0) | |
99 | return 1; | |
100 | ||
101 | /* read sector aligned part */ | |
102 | block_len = byte_len & ~(SECTOR_SIZE - 1); | |
103 | ||
104 | if (block_len == 0) { | |
55b523b7 | 105 | ALLOC_CACHE_ALIGN_BUFFER(u8, p, SECTOR_SIZE); |
a1596438 US |
106 | |
107 | block_len = SECTOR_SIZE; | |
108 | ext4fs_block_dev_desc->block_read(ext4fs_block_dev_desc->dev, | |
81180819 | 109 | part_info->start + sector, |
a1596438 US |
110 | 1, (unsigned long *)p); |
111 | memcpy(buf, p, byte_len); | |
112 | return 1; | |
113 | } | |
114 | ||
115 | if (ext4fs_block_dev_desc->block_read(ext4fs_block_dev_desc->dev, | |
81180819 | 116 | part_info->start + sector, |
a1596438 US |
117 | block_len / SECTOR_SIZE, |
118 | (unsigned long *) buf) != | |
119 | block_len / SECTOR_SIZE) { | |
120 | printf(" ** %s read error - block\n", __func__); | |
121 | return 0; | |
122 | } | |
123 | block_len = byte_len & ~(SECTOR_SIZE - 1); | |
124 | buf += block_len; | |
125 | byte_len -= block_len; | |
126 | sector += block_len / SECTOR_SIZE; | |
127 | ||
128 | if (byte_len != 0) { | |
129 | /* read rest of data which are not in whole sector */ | |
130 | if (ext4fs_block_dev_desc-> | |
131 | block_read(ext4fs_block_dev_desc->dev, | |
81180819 | 132 | part_info->start + sector, 1, |
a1596438 US |
133 | (unsigned long *) sec_buf) != 1) { |
134 | printf("* %s read error - last part\n", __func__); | |
135 | return 0; | |
136 | } | |
137 | memcpy(buf, sec_buf, byte_len); | |
138 | } | |
139 | return 1; | |
140 | } |