fs/yaffs2/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 #include "yaffs_summary.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 flash_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, flash_chunk, buffer,
  36                                                   tags);
  37         else
  38                 result = yaffs_tags_compat_rd(dev,
  39                                               flash_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         int result;
  56         int flash_chunk = nand_chunk - dev->chunk_offset;
  57
  58         dev->n_page_writes++;
  59
  60         if (tags) {
  61                 tags->seq_number = dev->seq_number;
  62                 tags->chunk_used = 1;
  63                 yaffs_trace(YAFFS_TRACE_WRITE,
  64                         "Writing chunk %d tags %d %d",
  65                         nand_chunk, tags->obj_id, tags->chunk_id);
  66         } else {
  67                 yaffs_trace(YAFFS_TRACE_ERROR, "Writing with no tags");
  68                 BUG();
  69                 return YAFFS_FAIL;
  70         }
  71
  72         if (dev->param.write_chunk_tags_fn)
  73                 result = dev->param.write_chunk_tags_fn(dev, flash_chunk,
  74                                                         buffer, tags);
  75         else
  76                 result = yaffs_tags_compat_wr(dev, flash_chunk, buffer, tags);
  77
  78         yaffs_summary_add(dev, tags, nand_chunk);
  79
  80         return result;
  81 }
  82
  83 int yaffs_mark_bad(struct yaffs_dev *dev, int block_no)
  84 {
  85         block_no -= dev->block_offset;
  86         if (dev->param.bad_block_fn)
  87                 return dev->param.bad_block_fn(dev, block_no);
  88
  89         return yaffs_tags_compat_mark_bad(dev, block_no);
  90 }
  91
  92 int yaffs_query_init_block_state(struct yaffs_dev *dev,
  93                                  int block_no,
  94                                  enum yaffs_block_state *state,
  95                                  u32 *seq_number)
  96 {
  97         block_no -= dev->block_offset;
  98         if (dev->param.query_block_fn)
  99                 return dev->param.query_block_fn(dev, block_no, state,
 100                                                  seq_number);
 101
 102         return yaffs_tags_compat_query_block(dev, block_no, state, seq_number);
 103 }
 104
 105 int yaffs_erase_block(struct yaffs_dev *dev, int flash_block)
 106 {
 107         int result;
 108
 109         flash_block -= dev->block_offset;
 110         dev->n_erasures++;
 111         result = dev->param.erase_fn(dev, flash_block);
 112         return result;
 113 }
 114
 115 int yaffs_init_nand(struct yaffs_dev *dev)
 116 {
 117         if (dev->param.initialise_flash_fn)
 118                 return dev->param.initialise_flash_fn(dev);
 119         return YAFFS_OK;
 120 }