1/* 2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. 3 * 4 * Copyright (C) 2002-2010 Aleph One Ltd. 5 * for Toby Churchill Ltd and Brightstar Engineering 6 * 7 * Created by Charles Manning <charles@aleph1.co.uk> 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12 */ 13 14/* mtd interface for YAFFS2 */ 15 16#include "yportenv.h" 17#include "yaffs_trace.h" 18 19#include "yaffs_mtdif2.h" 20 21#include "linux/mtd/mtd.h" 22#include "linux/types.h" 23#include "linux/time.h" 24 25#include "yaffs_packedtags2.h" 26 27#include "yaffs_linux.h" 28 29/* NB For use with inband tags.... 30 * We assume that the data buffer is of size totalBytersPerChunk so that we can also 31 * use it to load the tags. 32 */ 33int nandmtd2_WriteChunkWithTagsToNAND(yaffs_dev_t *dev, int nand_chunk, 34 const __u8 *data, 35 const yaffs_ext_tags *tags) 36{ 37 struct mtd_info *mtd = yaffs_dev_to_mtd(dev); 38#if (MTD_VERSION_CODE > MTD_VERSION(2, 6, 17)) 39 struct mtd_oob_ops ops; 40#else 41 size_t dummy; 42#endif 43 int retval = 0; 44 45 loff_t addr; 46 47 yaffs_PackedTags2 pt; 48 49 int packed_tags_size = dev->param.no_tags_ecc ? sizeof(pt.t) : sizeof(pt); 50 void * packed_tags_ptr = dev->param.no_tags_ecc ? (void *) &pt.t : (void *)&pt; 51 52 T(YAFFS_TRACE_MTD, 53 (TSTR 54 ("nandmtd2_WriteChunkWithTagsToNAND chunk %d data %p tags %p" 55 TENDSTR), nand_chunk, data, tags)); 56 57 58 addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk; 59 60 /* For yaffs2 writing there must be both data and tags. 61 * If we're using inband tags, then the tags are stuffed into 62 * the end of the data buffer. 63 */ 64 if (!data || !tags) 65 BUG(); 66 else if (dev->param.inband_tags) { 67 yaffs_PackedTags2TagsPart *pt2tp; 68 pt2tp = (yaffs_PackedTags2TagsPart *)(data + dev->data_bytes_per_chunk); 69 yaffs_PackTags2TagsPart(pt2tp, tags); 70 } else 71 yaffs_PackTags2(&pt, tags, !dev->param.no_tags_ecc); 72 73#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17)) 74 ops.mode = MTD_OOB_AUTO; 75 ops.ooblen = (dev->param.inband_tags) ? 0 : packed_tags_size; 76 ops.len = dev->param.total_bytes_per_chunk; 77 ops.ooboffs = 0; 78 ops.datbuf = (__u8 *)data; 79 ops.oobbuf = (dev->param.inband_tags) ? NULL : packed_tags_ptr; 80 retval = mtd->write_oob(mtd, addr, &ops); 81 82#else 83 if (!dev->param.inband_tags) { 84 retval = 85 mtd->write_ecc(mtd, addr, dev->data_bytes_per_chunk, 86 &dummy, data, (__u8 *) packed_tags_ptr, NULL); 87 } else { 88 retval = 89 mtd->write(mtd, addr, dev->param.total_bytes_per_chunk, &dummy, 90 data); 91 } 92#endif 93 94 if (retval == 0) 95 return YAFFS_OK; 96 else 97 return YAFFS_FAIL; 98} 99 100int nandmtd2_ReadChunkWithTagsFromNAND(yaffs_dev_t *dev, int nand_chunk, 101 __u8 *data, yaffs_ext_tags *tags) 102{ 103 struct mtd_info *mtd = yaffs_dev_to_mtd(dev); 104#if (MTD_VERSION_CODE > MTD_VERSION(2, 6, 17)) 105 struct mtd_oob_ops ops; 106#endif 107 size_t dummy; 108 int retval = 0; 109 int localData = 0; 110 111 loff_t addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk; 112 113 yaffs_PackedTags2 pt; 114 115 int packed_tags_size = dev->param.no_tags_ecc ? sizeof(pt.t) : sizeof(pt); 116 void * packed_tags_ptr = dev->param.no_tags_ecc ? (void *) &pt.t: (void *)&pt; 117 118 T(YAFFS_TRACE_MTD, 119 (TSTR 120 ("nandmtd2_ReadChunkWithTagsFromNAND chunk %d data %p tags %p" 121 TENDSTR), nand_chunk, data, tags)); 122 123 if (dev->param.inband_tags) { 124 125 if (!data) { 126 localData = 1; 127 data = yaffs_get_temp_buffer(dev, __LINE__); 128 } 129 130 131 } 132 133 134#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17)) 135 if (dev->param.inband_tags || (data && !tags)) 136 retval = mtd->read(mtd, addr, dev->param.total_bytes_per_chunk, 137 &dummy, data); 138 else if (tags) { 139 ops.mode = MTD_OOB_AUTO; 140 ops.ooblen = packed_tags_size; 141 ops.len = data ? dev->data_bytes_per_chunk : packed_tags_size; 142 ops.ooboffs = 0; 143 ops.datbuf = data; 144 ops.oobbuf = yaffs_dev_to_lc(dev)->spareBuffer; 145 retval = mtd->read_oob(mtd, addr, &ops); 146 } 147#else 148 if (!dev->param.inband_tags && data && tags) { 149 150 retval = mtd->read_ecc(mtd, addr, dev->data_bytes_per_chunk, 151 &dummy, data, dev->spareBuffer, 152 NULL); 153 } else { 154 if (data) 155 retval = 156 mtd->read(mtd, addr, dev->data_bytes_per_chunk, &dummy, 157 data); 158 if (!dev->param.inband_tags && tags) 159 retval = 160 mtd->read_oob(mtd, addr, mtd->oobsize, &dummy, 161 dev->spareBuffer); 162 } 163#endif 164 165 166 if (dev->param.inband_tags) { 167 if (tags) { 168 yaffs_PackedTags2TagsPart *pt2tp; 169 pt2tp = (yaffs_PackedTags2TagsPart *)&data[dev->data_bytes_per_chunk]; 170 yaffs_unpack_tags2tags_part(tags, pt2tp); 171 } 172 } else { 173 if (tags) { 174 memcpy(packed_tags_ptr, yaffs_dev_to_lc(dev)->spareBuffer, packed_tags_size); 175 yaffs_unpack_tags2(tags, &pt, !dev->param.no_tags_ecc); 176 } 177 } 178 179 if (localData) 180 yaffs_release_temp_buffer(dev, data, __LINE__); 181 182 if (tags && retval == -EBADMSG && tags->ecc_result == YAFFS_ECC_RESULT_NO_ERROR) { 183 tags->ecc_result = YAFFS_ECC_RESULT_UNFIXED; 184 dev->n_ecc_unfixed++; 185 } 186 if(tags && retval == -EUCLEAN && tags->ecc_result == YAFFS_ECC_RESULT_NO_ERROR) { 187 tags->ecc_result = YAFFS_ECC_RESULT_FIXED; 188 dev->n_ecc_fixed++; 189 } 190 if (retval == 0) 191 return YAFFS_OK; 192 else 193 return YAFFS_FAIL; 194} 195 196int nandmtd2_MarkNANDBlockBad(struct yaffs_dev_s *dev, int block_no) 197{ 198 struct mtd_info *mtd = yaffs_dev_to_mtd(dev); 199 int retval; 200 T(YAFFS_TRACE_MTD, 201 (TSTR("nandmtd2_MarkNANDBlockBad %d" TENDSTR), block_no)); 202 203 retval = 204 mtd->block_markbad(mtd, 205 block_no * dev->param.chunks_per_block * 206 dev->param.total_bytes_per_chunk); 207 208 if (retval == 0) 209 return YAFFS_OK; 210 else 211 return YAFFS_FAIL; 212 213} 214 215int nandmtd2_QueryNANDBlock(struct yaffs_dev_s *dev, int block_no, 216 yaffs_block_state_t *state, __u32 *seq_number) 217{ 218 struct mtd_info *mtd = yaffs_dev_to_mtd(dev); 219 int retval; 220 221 T(YAFFS_TRACE_MTD, 222 (TSTR("nandmtd2_QueryNANDBlock %d" TENDSTR), block_no)); 223 retval = 224 mtd->block_isbad(mtd, 225 block_no * dev->param.chunks_per_block * 226 dev->param.total_bytes_per_chunk); 227 228 if (retval) { 229 T(YAFFS_TRACE_MTD, (TSTR("block is bad" TENDSTR))); 230 231 *state = YAFFS_BLOCK_STATE_DEAD; 232 *seq_number = 0; 233 } else { 234 yaffs_ext_tags t; 235 nandmtd2_ReadChunkWithTagsFromNAND(dev, 236 block_no * 237 dev->param.chunks_per_block, NULL, 238 &t); 239 240 if (t.chunk_used) { 241 *seq_number = t.seq_number; 242 *state = YAFFS_BLOCK_STATE_NEEDS_SCANNING; 243 } else { 244 *seq_number = 0; 245 *state = YAFFS_BLOCK_STATE_EMPTY; 246 } 247 } 248 T(YAFFS_TRACE_MTD, 249 (TSTR("block is bad seq %d state %d" TENDSTR), *seq_number, 250 *state)); 251 252 if (retval == 0) 253 return YAFFS_OK; 254 else 255 return YAFFS_FAIL; 256} 257 258