text: /*
   * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
   *
   * Copyright (C) 2002-2010 Aleph One Ltd.
   *   for Toby Churchill Ltd and Brightstar Engineering
   *
   * Created by Charles Manning <charles@aleph1.co.uk>
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   */
  
  #include "yaffs_nand.h"
  #include "yaffs_tagscompat.h"
  #include "yaffs_tagsvalidity.h"
  
  #include "yaffs_getblockinfo.h"
  
  int yaffs_rd_chunk_tags_nand(yaffs_dev_t *dev, int nand_chunk,
  					   __u8 *buffer,
  					   yaffs_ext_tags *tags)
  {
  	int result;
  	yaffs_ext_tags localTags;
  
  	int realignedChunkInNAND = nand_chunk - dev->chunk_offset;
  
  	dev->n_page_reads++;
  
  	/* If there are no tags provided, use local tags to get prioritised gc working */
  	if (!tags)
  		tags = &localTags;
  
  	if (dev->param.read_chunk_tags_fn)
  		result = dev->param.read_chunk_tags_fn(dev, realignedChunkInNAND, buffer,
  						      tags);
  	else
  		result = yaffs_tags_compat_rd(dev,
  									realignedChunkInNAND,
  									buffer,
  									tags);
  	if (tags &&
  	   tags->ecc_result > YAFFS_ECC_RESULT_NO_ERROR) {
  
  		yaffs_block_info_t *bi;
  		bi = yaffs_get_block_info(dev, nand_chunk/dev->param.chunks_per_block);
  		yaffs_handle_chunk_error(dev, bi);
  	}
  
  	return result;
  }
  
  int yaffs_wr_chunk_tags_nand(yaffs_dev_t *dev,
  						   int nand_chunk,
  						   const __u8 *buffer,
  						   yaffs_ext_tags *tags)
  {
  
  	dev->n_page_writes++;
  
  	nand_chunk -= dev->chunk_offset;
  
  
  	if (tags) {
  		tags->seq_number = dev->seq_number;
  		tags->chunk_used = 1;
  		if (!yaffs_validate_tags(tags)) {
  			T(YAFFS_TRACE_ERROR,
  			  (TSTR("Writing uninitialised tags" TENDSTR)));
  			YBUG();
  		}
  		T(YAFFS_TRACE_WRITE,
  		  (TSTR("Writing chunk %d tags %d %d" TENDSTR), nand_chunk,
  		   tags->obj_id, tags->chunk_id));
  	} else {
  		T(YAFFS_TRACE_ERROR, (TSTR("Writing with no tags" TENDSTR)));
  		YBUG();
  	}
  
  	if (dev->param.write_chunk_tags_fn)
  		return dev->param.write_chunk_tags_fn(dev, nand_chunk, buffer,
  						     tags);
  	else
  		return yaffs_tags_compat_wr(dev,
  								       nand_chunk,
  								       buffer,
  								       tags);
  }
  
  int yaffs_mark_bad(yaffs_dev_t *dev, int block_no)
  {
  	block_no -= dev->block_offset;
  
  
  	if (dev->param.bad_block_fn)
  		return dev->param.bad_block_fn(dev, block_no);
  	else
  		return yaffs_tags_compat_mark_bad(dev, block_no);
  }
  
  int yaffs_query_init_block_state(yaffs_dev_t *dev,
  						 int block_no,
  						 yaffs_block_state_t *state,
  						 __u32 *seq_number)
  {
  	block_no -= dev->block_offset;
  
  	if (dev->param.query_block_fn)
  		return dev->param.query_block_fn(dev, block_no, state, seq_number);
  	else
  		return yaffs_tags_compat_query_block(dev, block_no,
  							     state,
  							     seq_number);
  }
  
  
  int yaffs_erase_block(struct yaffs_dev_s *dev,
  				  int flash_block)
  {
  	int result;
  
  	flash_block -= dev->block_offset;
  
  	dev->n_erasures++;
  
  	result = dev->param.erase_fn(dev, flash_block);
  
  	return result;
  }
  
  int yaffs_init_nand(struct yaffs_dev_s *dev)
  {
  	if(dev->param.initialise_flash_fn)
  		return dev->param.initialise_flash_fn(dev);
  	return YAFFS_OK;
  }
  
  
  
  