text: /*
   * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
   *
   * Copyright (C) 2002-2007 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.
   */
  
  /* XXX U-BOOT XXX */
  #include <common.h>
  
  #include "yportenv.h"
  
  
  #include "yaffs_mtdif.h"
  
  #include "linux/mtd/mtd.h"
  #include "linux/types.h"
  #include "linux/time.h"
  #include "linux/mtd/nand.h"
  
  
  static inline void translate_spare2oob(const struct yaffs_spare *spare, u8 *oob)
  {
  	oob[0] = spare->tb0;
  	oob[1] = spare->tb1;
  	oob[2] = spare->tb2;
  	oob[3] = spare->tb3;
  	oob[4] = spare->tb4;
  	oob[5] = spare->tb5 & 0x3f;
  	oob[5] |= spare->block_status == 'Y' ? 0 : 0x80;
  	oob[5] |= spare->page_status == 0 ? 0 : 0x40;
  	oob[6] = spare->tb6;
  	oob[7] = spare->tb7;
  }
  
  static inline void translate_oob2spare(struct yaffs_spare *spare, u8 *oob)
  {
  	struct yaffs_nand_spare *nspare = (struct yaffs_nand_spare *)spare;
  	spare->tb0 = oob[0];
  	spare->tb1 = oob[1];
  	spare->tb2 = oob[2];
  	spare->tb3 = oob[3];
  	spare->tb4 = oob[4];
  	spare->tb5 = oob[5] == 0xff ? 0xff : oob[5] & 0x3f;
  	spare->block_status = oob[5] & 0x80 ? 0xff : 'Y';
  	spare->page_status = oob[5] & 0x40 ? 0xff : 0;
  	spare->ecc1[0] = spare->ecc1[1] = spare->ecc1[2] = 0xff;
  	spare->tb6 = oob[6];
  	spare->tb7 = oob[7];
  	spare->ecc2[0] = spare->ecc2[1] = spare->ecc2[2] = 0xff;
  
  	nspare->eccres1 = nspare->eccres2 = 0; /* FIXME */
  }
  
  
  int nandmtd_WriteChunkToNAND(struct yaffs_dev *dev, int chunkInNAND,
  			     const u8 *data, const struct yaffs_spare *spare)
  {
  	struct mtd_info *mtd = (struct mtd_info *)(dev->driver_context);
  	struct mtd_oob_ops ops;
  	size_t dummy;
  	int retval = 0;
  	loff_t addr = ((loff_t) chunkInNAND) * dev->param.total_bytes_per_chunk;
  	u8 spareAsBytes[8]; /* OOB */
  
  	if (data && !spare)
  		retval = mtd->write(mtd, addr, dev->data_bytes_per_chunk,
  				&dummy, data);
  	else if (spare) {
  		if (dev->param.use_nand_ecc) {
  			translate_spare2oob(spare, spareAsBytes);
  			ops.mode = MTD_OOB_AUTO;
  			ops.ooblen = 8; /* temp hack */
  		} else {
  			ops.mode = MTD_OOB_RAW;
  			ops.ooblen = YAFFS_BYTES_PER_SPARE;
  		}
  		ops.len = data ? dev->data_bytes_per_chunk : ops.ooblen;
  		ops.datbuf = (u8 *)data;
  		ops.ooboffs = 0;
  		ops.oobbuf = spareAsBytes;
  		retval = mtd->write_oob(mtd, addr, &ops);
  	}
  
  	if (retval == 0)
  		return YAFFS_OK;
  	else
  		return YAFFS_FAIL;
  }
  
  int nandmtd_ReadChunkFromNAND(struct yaffs_dev *dev, int chunkInNAND, u8 *data,
  			      struct yaffs_spare *spare)
  {
  	struct mtd_info *mtd = (struct mtd_info *)(dev->driver_context);
  	struct mtd_oob_ops ops;
  	size_t dummy;
  	int retval = 0;
  
  	loff_t addr = ((loff_t) chunkInNAND) * dev->param.total_bytes_per_chunk;
  	u8 spareAsBytes[8]; /* OOB */
  
  	if (data && !spare)
  		retval = mtd->read(mtd, addr, dev->data_bytes_per_chunk,
  				&dummy, data);
  	else if (spare) {
  		if (dev->param.use_nand_ecc) {
  			ops.mode = MTD_OOB_AUTO;
  			ops.ooblen = 8; /* temp hack */
  		} else {
  			ops.mode = MTD_OOB_RAW;
  			ops.ooblen = YAFFS_BYTES_PER_SPARE;
  		}
  		ops.len = data ? dev->data_bytes_per_chunk : ops.ooblen;
  		ops.datbuf = data;
  		ops.ooboffs = 0;
  		ops.oobbuf = spareAsBytes;
  		retval = mtd->read_oob(mtd, addr, &ops);
  		if (dev->param.use_nand_ecc)
  			translate_oob2spare(spare, spareAsBytes);
  	}
  
  	if (retval == 0)
  		return YAFFS_OK;
  	else
  		return YAFFS_FAIL;
  }
  
  int nandmtd_EraseBlockInNAND(struct yaffs_dev *dev, int blockNumber)
  {
  	struct mtd_info *mtd = (struct mtd_info *)(dev->driver_context);
  	__u32 addr =
  	    ((loff_t) blockNumber) * dev->param.total_bytes_per_chunk
  		* dev->param.chunks_per_block;
  	struct erase_info ei;
  	int retval = 0;
  
  	ei.mtd = mtd;
  	ei.addr = addr;
  	ei.len = dev->data_bytes_per_chunk * dev->param.chunks_per_block;
  	ei.time = 1000;
  	ei.retries = 2;
  	ei.callback = NULL;
  	ei.priv = (u_long) dev;
  
  	/* Todo finish off the ei if required */
  
  
  	retval = mtd->erase(mtd, &ei);
  
  	if (retval == 0)
  		return YAFFS_OK;
  	else
  		return YAFFS_FAIL;
  }
  
  int nandmtd_InitialiseNAND(struct yaffs_dev *dev)
  {
  	return YAFFS_OK;
  }
  