/*
   * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
   *

   * Copyright (C) 2002-2011 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_getblockinfo.h"
  #include "yaffs_summary.h"

  int yaffs_rd_chunk_tags_nand(struct yaffs_dev *dev, int nand_chunk,
  			     u8 *buffer, struct yaffs_ext_tags *tags)

  {
  	int result;

  	struct yaffs_ext_tags local_tags;
  	int flash_chunk = nand_chunk - dev->chunk_offset;

  	dev->n_page_reads++;

  	/* If there are no tags provided use local tags. */
  	if (!tags)
  		tags = &local_tags;

  	if (dev->param.read_chunk_tags_fn)
  		result =
  		    dev->param.read_chunk_tags_fn(dev, flash_chunk, buffer,
  						  tags);

  	else

  		result = yaffs_tags_compat_rd(dev,
  					      flash_chunk, buffer, tags);
  	if (tags && tags->ecc_result > YAFFS_ECC_RESULT_NO_ERROR) {
  
  		struct yaffs_block_info *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(struct yaffs_dev *dev,
  				int nand_chunk,
  				const u8 *buffer, struct yaffs_ext_tags *tags)

  {

  	int result;
  	int flash_chunk = nand_chunk - dev->chunk_offset;

  	dev->n_page_writes++;

  	if (tags) {

  		tags->seq_number = dev->seq_number;
  		tags->chunk_used = 1;
  		yaffs_trace(YAFFS_TRACE_WRITE,
  			"Writing chunk %d tags %d %d",
  			nand_chunk, tags->obj_id, tags->chunk_id);

  	} else {

  		yaffs_trace(YAFFS_TRACE_ERROR, "Writing with no tags");
  		BUG();
  		return YAFFS_FAIL;

  	}

  	if (dev->param.write_chunk_tags_fn)
  		result = dev->param.write_chunk_tags_fn(dev, flash_chunk,
  							buffer, tags);

  	else

  		result = yaffs_tags_compat_wr(dev, flash_chunk, buffer, tags);
  
  	yaffs_summary_add(dev, tags, nand_chunk);
  
  	return result;

  }

  int yaffs_mark_bad(struct yaffs_dev *dev, int block_no)

  {

  	block_no -= dev->block_offset;
  	if (dev->param.bad_block_fn)
  		return dev->param.bad_block_fn(dev, block_no);

  	return yaffs_tags_compat_mark_bad(dev, block_no);

  }

  int yaffs_query_init_block_state(struct yaffs_dev *dev,
  				 int block_no,
  				 enum yaffs_block_state *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);

  	return yaffs_tags_compat_query_block(dev, block_no, state, seq_number);

  }

  int yaffs_erase_block(struct yaffs_dev *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 *dev)

  {

  	if (dev->param.initialise_flash_fn)
  		return dev->param.initialise_flash_fn(dev);
  	return YAFFS_OK;

  }