fs/yaffs2/yaffs_mtdif2.c

   1 /*
   2  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
   3  *
   4  * Copyright (C) 2002-2007 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 /* XXX U-BOOT XXX */
  17 #include <common.h>
  18 #include <linux/errno.h>
  19
  20 #include "yportenv.h"
  21 #include "yaffs_trace.h"
  22
  23 #include "yaffs_mtdif2.h"
  24
  25 #include <linux/mtd/mtd.h>
  26 #include <linux/types.h>
  27 #include <linux/time.h>
  28
  29 #include "yaffs_trace.h"
  30 #include "yaffs_packedtags2.h"
  31
  32 #define yaffs_dev_to_mtd(dev) ((struct mtd_info *)((dev)->driver_context))
  33 #define yaffs_dev_to_lc(dev) ((struct yaffs_linux_context *)((dev)->os_context))
  34
  35
  36 /* NB For use with inband tags....
  37  * We assume that the data buffer is of size total_bytes_per_chunk so
  38  * that we can also use it to load the tags.
  39  */
  40 int nandmtd2_write_chunk_tags(struct yaffs_dev *dev, int nand_chunk,
  41                               const u8 *data,
  42                               const struct yaffs_ext_tags *tags)
  43 {
  44         struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
  45         struct mtd_oob_ops ops;
  46
  47         int retval = 0;
  48         loff_t addr;
  49
  50         struct yaffs_packed_tags2 pt;
  51
  52         int packed_tags_size =
  53             dev->param.no_tags_ecc ? sizeof(pt.t) : sizeof(pt);
  54         void *packed_tags_ptr =
  55             dev->param.no_tags_ecc ? (void *)&pt.t : (void *)&pt;
  56
  57         yaffs_trace(YAFFS_TRACE_MTD,
  58                 "nandmtd2_write_chunk_tags chunk %d data %p tags %p",
  59                 nand_chunk, data, tags);
  60
  61         addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk;
  62
  63         /* For yaffs2 writing there must be both data and tags.
  64          * If we're using inband tags, then the tags are stuffed into
  65          * the end of the data buffer.
  66          */
  67         if (!data || !tags)
  68                 BUG();
  69         else if (dev->param.inband_tags) {
  70                 struct yaffs_packed_tags2_tags_only *pt2tp;
  71                 pt2tp =
  72                     (struct yaffs_packed_tags2_tags_only *)(data +
  73                                                         dev->
  74                                                         data_bytes_per_chunk);
  75                 yaffs_pack_tags2_tags_only(pt2tp, tags);
  76         } else {
  77                 yaffs_pack_tags2(&pt, tags, !dev->param.no_tags_ecc);
  78         }
  79
  80         ops.mode = MTD_OPS_AUTO_OOB;
  81         ops.ooblen = (dev->param.inband_tags) ? 0 : packed_tags_size;
  82         ops.len = dev->param.total_bytes_per_chunk;
  83         ops.ooboffs = 0;
  84         ops.datbuf = (u8 *) data;
  85         ops.oobbuf = (dev->param.inband_tags) ? NULL : packed_tags_ptr;
  86         retval = mtd_write_oob(mtd, addr, &ops);
  87
  88         if (retval == 0)
  89                 return YAFFS_OK;
  90         else
  91                 return YAFFS_FAIL;
  92 }
  93
  94 int nandmtd2_read_chunk_tags(struct yaffs_dev *dev, int nand_chunk,
  95                              u8 *data, struct yaffs_ext_tags *tags)
  96 {
  97         struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
  98         u8 local_spare[128];
  99         struct mtd_oob_ops ops;
 100         size_t dummy;
 101         int retval = 0;
 102         int local_data = 0;
 103         struct yaffs_packed_tags2 pt;
 104         loff_t addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk;
 105         int packed_tags_size =
 106             dev->param.no_tags_ecc ? sizeof(pt.t) : sizeof(pt);
 107         void *packed_tags_ptr =
 108             dev->param.no_tags_ecc ? (void *)&pt.t : (void *)&pt;
 109
 110         yaffs_trace(YAFFS_TRACE_MTD,
 111                 "nandmtd2_read_chunk_tags chunk %d data %p tags %p",
 112                 nand_chunk, data, tags);
 113
 114         if (dev->param.inband_tags) {
 115
 116                 if (!data) {
 117                         local_data = 1;
 118                         data = yaffs_get_temp_buffer(dev);
 119                 }
 120
 121         }
 122
 123         if (dev->param.inband_tags || (data && !tags))
 124                 retval = mtd_read(mtd, addr, dev->param.total_bytes_per_chunk,
 125                                    &dummy, data);
 126         else if (tags) {
 127                 ops.mode = MTD_OPS_AUTO_OOB;
 128                 ops.ooblen = packed_tags_size;
 129                 ops.len = data ? dev->data_bytes_per_chunk : packed_tags_size;
 130                 ops.ooboffs = 0;
 131                 ops.datbuf = data;
 132                 ops.oobbuf = local_spare;
 133                 retval = mtd_read_oob(mtd, addr, &ops);
 134         }
 135
 136         if (dev->param.inband_tags) {
 137                 if (tags) {
 138                         struct yaffs_packed_tags2_tags_only *pt2tp;
 139                         pt2tp =
 140                                 (struct yaffs_packed_tags2_tags_only *)
 141                                 &data[dev->data_bytes_per_chunk];
 142                         yaffs_unpack_tags2_tags_only(tags, pt2tp);
 143                 }
 144         } else {
 145                 if (tags) {
 146                         memcpy(packed_tags_ptr,
 147                                local_spare,
 148                                packed_tags_size);
 149                         yaffs_unpack_tags2(tags, &pt, !dev->param.no_tags_ecc);
 150                 }
 151         }
 152
 153         if (local_data)
 154                 yaffs_release_temp_buffer(dev, data);
 155
 156         if (tags && retval == -EBADMSG
 157             && tags->ecc_result == YAFFS_ECC_RESULT_NO_ERROR) {
 158                 tags->ecc_result = YAFFS_ECC_RESULT_UNFIXED;
 159                 dev->n_ecc_unfixed++;
 160         }
 161         if (tags && retval == -EUCLEAN
 162             && tags->ecc_result == YAFFS_ECC_RESULT_NO_ERROR) {
 163                 tags->ecc_result = YAFFS_ECC_RESULT_FIXED;
 164                 dev->n_ecc_fixed++;
 165         }
 166         if (retval == 0)
 167                 return YAFFS_OK;
 168         else
 169                 return YAFFS_FAIL;
 170 }
 171
 172
 173 int nandmtd2_MarkNANDBlockBad(struct yaffs_dev *dev, int blockNo)
 174 {
 175         struct mtd_info *mtd = (struct mtd_info *)(dev->driver_context);
 176         int retval;
 177
 178         yaffs_trace(YAFFS_TRACE_MTD,
 179                 "nandmtd2_MarkNANDBlockBad %d", blockNo);
 180
 181         retval =
 182             mtd_block_markbad(mtd,
 183                                blockNo * dev->param.chunks_per_block *
 184                                dev->data_bytes_per_chunk);
 185
 186         if (retval == 0)
 187                 return YAFFS_OK;
 188         else
 189                 return YAFFS_FAIL;
 190
 191 }
 192
 193 int nandmtd2_QueryNANDBlock(struct yaffs_dev *dev, int blockNo,
 194                             enum yaffs_block_state *state, u32 *sequenceNumber)
 195 {
 196         struct mtd_info *mtd = (struct mtd_info *)(dev->driver_context);
 197         int retval;
 198
 199         yaffs_trace(YAFFS_TRACE_MTD, "nandmtd2_QueryNANDBlock %d", blockNo);
 200         retval =
 201             mtd_block_isbad(mtd,
 202                              blockNo * dev->param.chunks_per_block *
 203                              dev->data_bytes_per_chunk);
 204
 205         if (retval) {
 206                 yaffs_trace(YAFFS_TRACE_MTD, "block is bad");
 207
 208                 *state = YAFFS_BLOCK_STATE_DEAD;
 209                 *sequenceNumber = 0;
 210         } else {
 211                 struct yaffs_ext_tags t;
 212                 nandmtd2_read_chunk_tags(dev,
 213                                            blockNo *
 214                                            dev->param.chunks_per_block, NULL,
 215                                            &t);
 216
 217                 if (t.chunk_used) {
 218                         *sequenceNumber = t.seq_number;
 219                         *state = YAFFS_BLOCK_STATE_NEEDS_SCAN;
 220                 } else {
 221                         *sequenceNumber = 0;
 222                         *state = YAFFS_BLOCK_STATE_EMPTY;
 223                 }
 224         }
 225         yaffs_trace(YAFFS_TRACE_MTD, "block is bad seq %d state %d",
 226                         *sequenceNumber, *state);
 227
 228         if (retval == 0)
 229                 return YAFFS_OK;
 230         else
 231                 return YAFFS_FAIL;
 232 }