target/linux/generic/files/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 static int apply_chunk_offset(struct yaffs_dev *dev, int chunk)
  21 {
  22         return chunk - dev->chunk_offset;
  23 }
  24
  25 int yaffs_rd_chunk_tags_nand(struct yaffs_dev *dev, int nand_chunk,
  26                              u8 *buffer, struct yaffs_ext_tags *tags)
  27 {
  28         int result;
  29         struct yaffs_ext_tags local_tags;
  30         int flash_chunk = apply_chunk_offset(dev, nand_chunk);
  31
  32         dev->n_page_reads++;
  33
  34         /* If there are no tags provided use local tags. */
  35         if (!tags)
  36                 tags = &local_tags;
  37
  38         result = dev->tagger.read_chunk_tags_fn(dev, flash_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         int result;
  55         int flash_chunk = apply_chunk_offset(dev, nand_chunk);
  56
  57         dev->n_page_writes++;
  58
  59         if (!tags) {
  60                 yaffs_trace(YAFFS_TRACE_ERROR, "Writing with no tags");
  61                 BUG();
  62                 return YAFFS_FAIL;
  63         }
  64
  65         tags->seq_number = dev->seq_number;
  66         tags->chunk_used = 1;
  67         yaffs_trace(YAFFS_TRACE_WRITE,
  68                 "Writing chunk %d tags %d %d",
  69                 nand_chunk, tags->obj_id, tags->chunk_id);
  70
  71         result = dev->tagger.write_chunk_tags_fn(dev, flash_chunk,
  72                                                         buffer, tags);
  73
  74         yaffs_summary_add(dev, tags, nand_chunk);
  75
  76         return result;
  77 }
  78
  79 int yaffs_mark_bad(struct yaffs_dev *dev, int block_no)
  80 {
  81         block_no -= dev->block_offset;
  82         dev->n_bad_markings++;
  83
  84         if (dev->param.disable_bad_block_marking)
  85                 return YAFFS_OK;
  86
  87         return dev->tagger.mark_bad_fn(dev, block_no);
  88 }
  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         return dev->tagger.query_block_fn(dev, block_no, state, seq_number);
  98 }
  99
 100 int yaffs_erase_block(struct yaffs_dev *dev, int block_no)
 101 {
 102         int result;
 103
 104         block_no -= dev->block_offset;
 105         dev->n_erasures++;
 106         result = dev->drv.drv_erase_fn(dev, block_no);
 107         return result;
 108 }
 109
 110 int yaffs_init_nand(struct yaffs_dev *dev)
 111 {
 112         if (dev->drv.drv_initialise_fn)
 113                 return dev->drv.drv_initialise_fn(dev);
 114         return YAFFS_OK;
 115 }
 116
 117 int yaffs_deinit_nand(struct yaffs_dev *dev)
 118 {
 119         if (dev->drv.drv_deinitialise_fn)
 120                 return dev->drv.drv_deinitialise_fn(dev);
 121         return YAFFS_OK;
 122 }