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 } 56 57 int ext4fs_devread(int sector, int byte_offset, int byte_len, char *buf) 58 { 59 ALLOC_CACHE_ALIGN_BUFFER(char, sec_buf, SECTOR_SIZE); 60 unsigned block_len; 61 62 /* Check partition boundaries */ 63 if ((sector < 0) 64 || ((sector + ((byte_offset + byte_len - 1) >> SECTOR_BITS)) >= 65 part_info->size)) { 66 printf("%s read outside partition %d\n", __func__, sector); 67 return 0; 68 } 69 70 /* Get the read to the beginning of a partition */ 71 sector += byte_offset >> SECTOR_BITS; 72 byte_offset &= SECTOR_SIZE - 1; 73 74 debug(" <%d, %d, %d>\n", sector, byte_offset, byte_len); 75 76 if (ext4fs_block_dev_desc == NULL) { 77 printf("** Invalid Block Device Descriptor (NULL)\n"); 78 return 0; 79 } 80 81 if (byte_offset != 0) { 82 /* read first part which isn't aligned with start of sector */ 83 if (ext4fs_block_dev_desc-> 84 block_read(ext4fs_block_dev_desc->dev, 85 part_info->start + sector, 1, 86 (unsigned long *) sec_buf) != 1) { 87 printf(" ** ext2fs_devread() read error **\n"); 88 return 0; 89 } 90 memcpy(buf, sec_buf + byte_offset, 91 min(SECTOR_SIZE - byte_offset, byte_len)); 92 buf += min(SECTOR_SIZE - byte_offset, byte_len); 93 byte_len -= min(SECTOR_SIZE - byte_offset, byte_len); 94 sector++; 95 } 96 97 if (byte_len == 0) 98 return 1; 99 100 /* read sector aligned part */ 101 block_len = byte_len & ~(SECTOR_SIZE - 1); 102 103 if (block_len == 0) { 104 ALLOC_CACHE_ALIGN_BUFFER(u8, p, SECTOR_SIZE); 105 106 block_len = SECTOR_SIZE; 107 ext4fs_block_dev_desc->block_read(ext4fs_block_dev_desc->dev, 108 part_info->start + sector, 109 1, (unsigned long *)p); 110 memcpy(buf, p, byte_len); 111 return 1; 112 } 113 114 if (ext4fs_block_dev_desc->block_read(ext4fs_block_dev_desc->dev, 115 part_info->start + sector, 116 block_len / SECTOR_SIZE, 117 (unsigned long *) buf) != 118 block_len / SECTOR_SIZE) { 119 printf(" ** %s read error - block\n", __func__); 120 return 0; 121 } 122 block_len = byte_len & ~(SECTOR_SIZE - 1); 123 buf += block_len; 124 byte_len -= block_len; 125 sector += block_len / SECTOR_SIZE; 126 127 if (byte_len != 0) { 128 /* read rest of data which are not in whole sector */ 129 if (ext4fs_block_dev_desc-> 130 block_read(ext4fs_block_dev_desc->dev, 131 part_info->start + sector, 1, 132 (unsigned long *) sec_buf) != 1) { 133 printf("* %s read error - last part\n", __func__); 134 return 0; 135 } 136 memcpy(buf, sec_buf, byte_len); 137 } 138 return 1; 139 } 140