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> 41 #include <ext4fs.h> 42 #include <ext_common.h> 43 44 unsigned long part_offset; 45 46 static block_dev_desc_t *ext4fs_block_dev_desc; 47 static disk_partition_t *part_info; 48 49 void ext4fs_set_blk_dev(block_dev_desc_t *rbdd, disk_partition_t *info) 50 { 51 ext4fs_block_dev_desc = rbdd; 52 part_info = info; 53 part_offset = info->start; 54 get_fs()->total_sect = (info->size * info->blksz) / SECTOR_SIZE; 55 get_fs()->dev_desc = rbdd; 56 } 57 58 int ext4fs_devread(int sector, int byte_offset, int byte_len, char *buf) 59 { 60 ALLOC_CACHE_ALIGN_BUFFER(char, sec_buf, SECTOR_SIZE); 61 unsigned block_len; 62 63 /* Check partition boundaries */ 64 if ((sector < 0) 65 || ((sector + ((byte_offset + byte_len - 1) >> SECTOR_BITS)) >= 66 part_info->size)) { 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, 86 part_info->start + sector, 1, 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) { 105 ALLOC_CACHE_ALIGN_BUFFER(u8, p, SECTOR_SIZE); 106 107 block_len = SECTOR_SIZE; 108 ext4fs_block_dev_desc->block_read(ext4fs_block_dev_desc->dev, 109 part_info->start + sector, 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, 116 part_info->start + sector, 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, 132 part_info->start + sector, 1, 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 } 141