yaffs_nand.c

   1 /*
   2  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
   3  *
   4  * Copyright (C) 2002-2011 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         int realigned_chunk = nand_chunk - dev->chunk_offset;
  26
  27         dev->n_page_reads++;
  28
  29         /* If there are no tags provided use local tags. */
  30         if (!tags)
  31                 tags = &local_tags;
  32
  33         if (dev->param.read_chunk_tags_fn)
  34                 result =
  35                     dev->param.read_chunk_tags_fn(dev, realigned_chunk, buffer,
  36                                                   tags);
  37         else
  38                 result = yaffs_tags_compat_rd(dev,
  39                                               realigned_chunk, buffer, tags);
  40         if (tags && tags->ecc_result > YAFFS_ECC_RESULT_NO_ERROR) {
  41
  42                 struct yaffs_block_info *bi;
  43                 bi = yaffs_get_block_info(dev,
  44                                           nand_chunk /
  45                                           dev->param.chunks_per_block);
  46                 yaffs_handle_chunk_error(dev, bi);
  47         }
  48         return result;
  49 }
  50
  51 int yaffs_wr_chunk_tags_nand(struct yaffs_dev *dev,
  52                                 int nand_chunk,
  53                                 const u8 *buffer, struct yaffs_ext_tags *tags)
  54 {
  55         dev->n_page_writes++;
  56         nand_chunk -= dev->chunk_offset;
  57
  58         if (tags) {
  59                 tags->seq_number = dev->seq_number;
  60                 tags->chunk_used = 1;
  61                 if (!yaffs_validate_tags(tags)) {
  62                         yaffs_trace(YAFFS_TRACE_ERROR,
  63                                 "Writing uninitialised tags");
  64                         BUG();
  65                 }
  66                 yaffs_trace(YAFFS_TRACE_WRITE,
  67                         "Writing chunk %d tags %d %d",
  68                         nand_chunk, tags->obj_id, tags->chunk_id);
  69         } else {
  70                 yaffs_trace(YAFFS_TRACE_ERROR, "Writing with no tags");
  71                 BUG();
  72                 return YAFFS_FAIL;
  73         }
  74
  75         if (dev->param.write_chunk_tags_fn)
  76                 return dev->param.write_chunk_tags_fn(dev, nand_chunk, buffer,
  77                                                         tags);
  78
  79         return yaffs_tags_compat_wr(dev, nand_chunk, buffer, tags);
  80 }
  81
  82 int yaffs_mark_bad(struct yaffs_dev *dev, int block_no)
  83 {
  84         block_no -= dev->block_offset;
  85         if (dev->param.bad_block_fn)
  86                 return dev->param.bad_block_fn(dev, block_no);
  87
  88         return yaffs_tags_compat_mark_bad(dev, block_no);
  89 }
  90
  91 int yaffs_query_init_block_state(struct yaffs_dev *dev,
  92                                  int block_no,
  93                                  enum yaffs_block_state *state,
  94                                  u32 *seq_number)
  95 {
  96         block_no -= dev->block_offset;
  97         if (dev->param.query_block_fn)
  98                 return dev->param.query_block_fn(dev, block_no, state,
  99                                                  seq_number);
 100
 101         return yaffs_tags_compat_query_block(dev, block_no, state, seq_number);
 102 }
 103
 104 int yaffs_erase_block(struct yaffs_dev *dev, int flash_block)
 105 {
 106         int result;
 107
 108         flash_block -= dev->block_offset;
 109         dev->n_erasures++;
 110         result = dev->param.erase_fn(dev, flash_block);
 111         return result;
 112 }
 113
 114 int yaffs_init_nand(struct yaffs_dev *dev)
 115 {
 116         if (dev->param.initialise_flash_fn)
 117                 return dev->param.initialise_flash_fn(dev);
 118         return YAFFS_OK;
 119 }