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 <ext_common.h> 42 43 static block_dev_desc_t *ext4fs_block_dev_desc; 44 static disk_partition_t part_info; 45 46 int ext4fs_set_blk_dev(block_dev_desc_t *rbdd, int part) 47 { 48 ext4fs_block_dev_desc = rbdd; 49 50 if (part == 0) { 51 /* disk doesn't use partition table */ 52 part_info.start = 0; 53 part_info.size = rbdd->lba; 54 part_info.blksz = rbdd->blksz; 55 } else { 56 if (get_partition_info(ext4fs_block_dev_desc, 57 part, &part_info)) 58 return 0; 59 } 60 return part_info.size; 61 } 62 63 int ext4fs_devread(int sector, int byte_offset, int byte_len, char *buf) 64 { 65 ALLOC_CACHE_ALIGN_BUFFER(char, sec_buf, SECTOR_SIZE); 66 unsigned block_len; 67 68 /* Check partition boundaries */ 69 if ((sector < 0) 70 || ((sector + ((byte_offset + byte_len - 1) >> SECTOR_BITS)) >= 71 part_info.size)) { 72 printf("%s read outside partition %d\n", __func__, sector); 73 return 0; 74 } 75 76 /* Get the read to the beginning of a partition */ 77 sector += byte_offset >> SECTOR_BITS; 78 byte_offset &= SECTOR_SIZE - 1; 79 80 debug(" <%d, %d, %d>\n", sector, byte_offset, byte_len); 81 82 if (ext4fs_block_dev_desc == NULL) { 83 printf("** Invalid Block Device Descriptor (NULL)\n"); 84 return 0; 85 } 86 87 if (byte_offset != 0) { 88 /* read first part which isn't aligned with start of sector */ 89 if (ext4fs_block_dev_desc-> 90 block_read(ext4fs_block_dev_desc->dev, 91 part_info.start + sector, 1, 92 (unsigned long *) sec_buf) != 1) { 93 printf(" ** ext2fs_devread() read error **\n"); 94 return 0; 95 } 96 memcpy(buf, sec_buf + byte_offset, 97 min(SECTOR_SIZE - byte_offset, byte_len)); 98 buf += min(SECTOR_SIZE - byte_offset, byte_len); 99 byte_len -= min(SECTOR_SIZE - byte_offset, byte_len); 100 sector++; 101 } 102 103 if (byte_len == 0) 104 return 1; 105 106 /* read sector aligned part */ 107 block_len = byte_len & ~(SECTOR_SIZE - 1); 108 109 if (block_len == 0) { 110 ALLOC_CACHE_ALIGN_BUFFER(u8, p, SECTOR_SIZE); 111 112 block_len = SECTOR_SIZE; 113 ext4fs_block_dev_desc->block_read(ext4fs_block_dev_desc->dev, 114 part_info.start + sector, 115 1, (unsigned long *)p); 116 memcpy(buf, p, byte_len); 117 return 1; 118 } 119 120 if (ext4fs_block_dev_desc->block_read(ext4fs_block_dev_desc->dev, 121 part_info.start + sector, 122 block_len / SECTOR_SIZE, 123 (unsigned long *) buf) != 124 block_len / SECTOR_SIZE) { 125 printf(" ** %s read error - block\n", __func__); 126 return 0; 127 } 128 block_len = byte_len & ~(SECTOR_SIZE - 1); 129 buf += block_len; 130 byte_len -= block_len; 131 sector += block_len / SECTOR_SIZE; 132 133 if (byte_len != 0) { 134 /* read rest of data which are not in whole sector */ 135 if (ext4fs_block_dev_desc-> 136 block_read(ext4fs_block_dev_desc->dev, 137 part_info.start + sector, 1, 138 (unsigned long *) sec_buf) != 1) { 139 printf("* %s read error - last part\n", __func__); 140 return 0; 141 } 142 memcpy(buf, sec_buf, byte_len); 143 } 144 return 1; 145 } 146