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