yaffs_nand.c

   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 #include "yaffs_nand.h"
  15 #include "yaffs_tagscompat.h"
  16 #include "yaffs_tagsvalidity.h"
  17
  18 #include "yaffs_getblockinfo.h"
  19
  20 int yaffs_rd_chunk_tags_nand(struct yaffs_dev *dev, int nand_chunk,
  21                              u8 * buffer, struct yaffs_ext_tags *tags)
  22 {
  23         int result;
  24         struct yaffs_ext_tags local_tags;
  25
  26         int realigned_chunk = nand_chunk - dev->chunk_offset;
  27
  28         dev->n_page_reads++;
  29
  30         /* If there are no tags provided, use local tags to get prioritised gc working */
  31         if (!tags)
  32                 tags = &local_tags;
  33
  34         if (dev->param.read_chunk_tags_fn)
  35                 result =
  36                     dev->param.read_chunk_tags_fn(dev, realigned_chunk, buffer,
  37                                                   tags);
  38         else
  39                 result = yaffs_tags_compat_rd(dev,
  40                                               realigned_chunk, buffer, tags);
  41         if (tags && tags->ecc_result > YAFFS_ECC_RESULT_NO_ERROR) {
  42
  43                 struct yaffs_block_info *bi;
  44                 bi = yaffs_get_block_info(dev,
  45                                           nand_chunk /
  46                                           dev->param.chunks_per_block);
  47                 yaffs_handle_chunk_error(dev, bi);
  48         }
  49
  50         return result;
  51 }
  52
  53 int yaffs_wr_chunk_tags_nand(struct yaffs_dev *dev,
  54                              int nand_chunk,
  55                              const u8 * buffer, struct yaffs_ext_tags *tags)
  56 {
  57
  58         dev->n_page_writes++;
  59
  60         nand_chunk -= dev->chunk_offset;
  61
  62         if (tags) {
  63                 tags->seq_number = dev->seq_number;
  64                 tags->chunk_used = 1;
  65                 if (!yaffs_validate_tags(tags)) {
  66                         T(YAFFS_TRACE_ERROR,
  67                           (TSTR("Writing uninitialised tags" TENDSTR)));
  68                         YBUG();
  69                 }
  70                 T(YAFFS_TRACE_WRITE,
  71                   (TSTR("Writing chunk %d tags %d %d" TENDSTR), nand_chunk,
  72                    tags->obj_id, tags->chunk_id));
  73         } else {
  74                 T(YAFFS_TRACE_ERROR, (TSTR("Writing with no tags" TENDSTR)));
  75                 YBUG();
  76         }
  77
  78         if (dev->param.write_chunk_tags_fn)
  79                 return dev->param.write_chunk_tags_fn(dev, nand_chunk, buffer,
  80                                                       tags);
  81         else
  82                 return yaffs_tags_compat_wr(dev, nand_chunk, buffer, tags);
  83 }
  84
  85 int yaffs_mark_bad(struct yaffs_dev *dev, int block_no)
  86 {
  87         block_no -= dev->block_offset;
  88
  89         if (dev->param.bad_block_fn)
  90                 return dev->param.bad_block_fn(dev, block_no);
  91         else
  92                 return yaffs_tags_compat_mark_bad(dev, block_no);
  93 }
  94
  95 int yaffs_query_init_block_state(struct yaffs_dev *dev,
  96                                  int block_no,
  97                                  enum yaffs_block_state *state,
  98                                  u32 * seq_number)
  99 {
 100         block_no -= dev->block_offset;
 101
 102         if (dev->param.query_block_fn)
 103                 return dev->param.query_block_fn(dev, block_no, state,
 104                                                  seq_number);
 105         else
 106                 return yaffs_tags_compat_query_block(dev, block_no,
 107                                                      state, seq_number);
 108 }
 109
 110 int yaffs_erase_block(struct yaffs_dev *dev, int flash_block)
 111 {
 112         int result;
 113
 114         flash_block -= dev->block_offset;
 115
 116         dev->n_erasures++;
 117
 118         result = dev->param.erase_fn(dev, flash_block);
 119
 120         return result;
 121 }
 122
 123 int yaffs_init_nand(struct yaffs_dev *dev)
 124 {
 125         if (dev->param.initialise_flash_fn)
 126                 return dev->param.initialise_flash_fn(dev);
 127         return YAFFS_OK;
 128 }