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(yaffs_dev_t *dev, int nand_chunk,
  21                                            __u8 *buffer,
  22                                            yaffs_ext_tags *tags)
  23 {
  24         int result;
  25         yaffs_ext_tags local_tags;
  26
  27         int realigned_chunk = nand_chunk - dev->chunk_offset;
  28
  29         dev->n_page_reads++;
  30
  31         /* If there are no tags provided, use local tags to get prioritised gc working */
  32         if (!tags)
  33                 tags = &local_tags;
  34
  35         if (dev->param.read_chunk_tags_fn)
  36                 result = dev->param.read_chunk_tags_fn(dev, realigned_chunk, buffer,
  37                                                       tags);
  38         else
  39                 result = yaffs_tags_compat_rd(dev,
  40                                                                         realigned_chunk,
  41                                                                         buffer,
  42                                                                         tags);
  43         if (tags &&
  44            tags->ecc_result > YAFFS_ECC_RESULT_NO_ERROR) {
  45
  46                 yaffs_block_info_t *bi;
  47                 bi = yaffs_get_block_info(dev, nand_chunk/dev->param.chunks_per_block);
  48                 yaffs_handle_chunk_error(dev, bi);
  49         }
  50
  51         return result;
  52 }
  53
  54 int yaffs_wr_chunk_tags_nand(yaffs_dev_t *dev,
  55                                                    int nand_chunk,
  56                                                    const __u8 *buffer,
  57                                                    yaffs_ext_tags *tags)
  58 {
  59
  60         dev->n_page_writes++;
  61
  62         nand_chunk -= dev->chunk_offset;
  63
  64
  65         if (tags) {
  66                 tags->seq_number = dev->seq_number;
  67                 tags->chunk_used = 1;
  68                 if (!yaffs_validate_tags(tags)) {
  69                         T(YAFFS_TRACE_ERROR,
  70                           (TSTR("Writing uninitialised tags" TENDSTR)));
  71                         YBUG();
  72                 }
  73                 T(YAFFS_TRACE_WRITE,
  74                   (TSTR("Writing chunk %d tags %d %d" TENDSTR), nand_chunk,
  75                    tags->obj_id, tags->chunk_id));
  76         } else {
  77                 T(YAFFS_TRACE_ERROR, (TSTR("Writing with no tags" TENDSTR)));
  78                 YBUG();
  79         }
  80
  81         if (dev->param.write_chunk_tags_fn)
  82                 return dev->param.write_chunk_tags_fn(dev, nand_chunk, buffer,
  83                                                      tags);
  84         else
  85                 return yaffs_tags_compat_wr(dev,
  86                                                                        nand_chunk,
  87                                                                        buffer,
  88                                                                        tags);
  89 }
  90
  91 int yaffs_mark_bad(yaffs_dev_t *dev, int block_no)
  92 {
  93         block_no -= dev->block_offset;
  94
  95
  96         if (dev->param.bad_block_fn)
  97                 return dev->param.bad_block_fn(dev, block_no);
  98         else
  99                 return yaffs_tags_compat_mark_bad(dev, block_no);
 100 }
 101
 102 int yaffs_query_init_block_state(yaffs_dev_t *dev,
 103                                                  int block_no,
 104                                                  yaffs_block_state_t *state,
 105                                                  __u32 *seq_number)
 106 {
 107         block_no -= dev->block_offset;
 108
 109         if (dev->param.query_block_fn)
 110                 return dev->param.query_block_fn(dev, block_no, state, seq_number);
 111         else
 112                 return yaffs_tags_compat_query_block(dev, block_no,
 113                                                              state,
 114                                                              seq_number);
 115 }
 116
 117
 118 int yaffs_erase_block(struct yaffs_dev_s *dev,
 119                                   int flash_block)
 120 {
 121         int result;
 122
 123         flash_block -= dev->block_offset;
 124
 125         dev->n_erasures++;
 126
 127         result = dev->param.erase_fn(dev, flash_block);
 128
 129         return result;
 130 }
 131
 132 int yaffs_init_nand(struct yaffs_dev_s *dev)
 133 {
 134         if(dev->param.initialise_flash_fn)
 135                 return dev->param.initialise_flash_fn(dev);
 136         return YAFFS_OK;
 137 }
 138
 139
 140