page = from >> this->page_shift;			offset = from & (mtd->oobblock - 1);			len2 = mtd->oobblock - offset;			next += len2;			nand_command(mtd, NAND_CMD_READ0, 0x00, page);			this->wait_for_ready();			ret = smc_read_ecc_512(mtd, ecc_code);			if (ret == -1)				goto nand_read_ecc_err;			if (next >= last)				if ((last & (mtd->oobblock - 1)) != 0)					len2 = (last & (mtd->oobblock - 1)) - offset;			for (j = 0; j < len2; j++)				buf[(*retlen) + j] = this->data_buf[offset + j];			*retlen += len2;			from = next;		}	}	ret = 0;	/* De-select the NAND device */	nand_deselect();	return ret;nand_read_ecc_err:	DEBUG(MTD_DEBUG_LEVEL0,		__FUNCTION__"(): Failed ECC read, page 0x%08lx\n", page);	return -EIO;}/* * NAND read out-of-band */static intnand_read_oob(struct mtd_info *mtd, loff_t from, size_t len,               size_t *retlen, u_char *buf){	int i, offset, page;	struct nand_chip *this = mtd->priv;	DEBUG(MTD_DEBUG_LEVEL3,		__FUNCTION__ "(): from = 0x%08x, len = %i\n", (unsigned int)from,		(int)len);	/* Shift to get page */	page = ((int)from) >> this->page_shift;	/* Mask to get column */	offset = from & 0x0f;	/* Initialize return length value */	*retlen = 0;	/* Do not allow read past end of page */	if ((offset + len) > mtd->oobsize) {		DEBUG(MTD_DEBUG_LEVEL0,			__FUNCTION__"(): Attempt read past end of page " \			"0x%08lx, column %i, length %i\n", page, offset, len);		return -EINVAL;	}	/* Select the NAND device */	nand_select();	/* Send the read command */	nand_command(mtd, NAND_CMD_READOOB, offset, page);	this->wait_for_ready();	/* Read the data */	for (i = 0; i < len; i++)		buf[i] = this->read_data();	/* De-select the NAND device */	nand_deselect();	/* Return happy */	*retlen = len;	return 0;}/* * NAND write */static intnand_write(struct mtd_info *mtd, loff_t to, size_t len,            size_t *retlen, const u_char *buf){	int i, page, col, cnt, status;	struct nand_chip *this = mtd->priv;	DEBUG(MTD_DEBUG_LEVEL3,		__FUNCTION__"(): to = 0x%08x, len = %i\n", (unsigned int)to,		(int) len);	/* Do not allow write past end of page */	if ((to + len) > mtd->size) {		DEBUG(MTD_DEBUG_LEVEL0,			__FUNCTION__"(): Attempted write past end of device\n");		return -EINVAL;	}	/* Shift to get page */	page = ((int)to) >> this->page_shift;	/* Get the starting column */	col = to & (mtd->oobblock - 1);	/* Initialize return length value */	*retlen = 0;	/* Select the NAND device */	nand_select();	/* Check the WP bit */	nand_command(mtd, NAND_CMD_STATUS, -1, -1);	this->wait_for_ready();	if (!(this->read_data() & SMC_STAT_NOT_WP)) {		DEBUG(MTD_DEBUG_LEVEL0,			__FUNCTION__"(): Device is write protected!!!\n");		i = -EPERM;		goto nand_write_exit;	}	/* Loop until all data is written */	while (*retlen < len) {		/* Write data into buffer */		if ((col + len) >= mtd->oobblock)			for (i = col, cnt = 0; i < mtd->oobblock; i++, cnt++)				this->data_buf[i] = buf[(*retlen + cnt)];		else			for (i = col, cnt = 0; cnt < (len - *retlen); i++, cnt++)				this->data_buf[i] = buf[(*retlen + cnt)];		/* Write ones for partial page programming */		for (i = mtd->oobblock; i < (mtd->oobblock + mtd->oobsize); i++)			this->data_buf[i] = 0xff;				/* Write pre-padding bytes into buffer */		for (i = 0; i < col; i++)			this->data_buf[i] = 0xff;		/* Write post-padding bytes into buffer */		if ((col + (len - *retlen)) < mtd->oobblock) {			for (i = (col + cnt); i < mtd->oobblock; i++)				this->data_buf[i] = 0xff;		}		/* Send command to begin auto page programming */		nand_command(mtd, NAND_CMD_SEQIN, 0x00, page);		/* Write out complete page of data */		this->hwcontrol(NAND_CTL_DAT_OUT);		for (i = 0; i < (mtd->oobblock + mtd->oobsize); i++)			this->write_data(this->data_buf[i]);		this->hwcontrol(NAND_CTL_DAT_IN);		/* Send command to actually program the data */		nand_command(mtd, NAND_CMD_PAGEPROG, -1, -1);		this->wait_for_ready();		/*		 * Wait for program operation to complete. This could		 * take up to 3000us (3ms) on some devices. so we try		 * and exit as quickly as possible.		 */		status = 0;		for (i = 0; i < 24; i++) {			/* Delay for 125us */			udelay(125);			/* Check for status */			nand_command(mtd, NAND_CMD_STATUS, -1, -1);			status = (int)this->read_data();			if (status & SMC_STAT_READY)				break;		}		/* See if device thinks it succeeded */		if (status & SMC_STAT_WRITE_ERR) {			DEBUG(MTD_DEBUG_LEVEL0,				__FUNCTION__"(): Failed write, page 0x%08x, " \				"%6i bytes were sucesful\n", page, *retlen);			i = -EIO;			goto nand_write_exit;		}#ifdef CONFIG_MTD_NAND_VERIFY_WRITE		/*		 * The NAND device assumes that it is always writing to		 * a cleanly erased page. Hence, it performs its internal		 * write verification only on bits that transitioned from		 * 1 to 0. The device does NOT verify the whole page on		 * a byte by byte basis. It is possible that the page was		 * not completely erased or the page is becoming unusable		 * due to wear. The read with ECC would catch the error		 * later when the ECC page check fails, but we would rather		 * catch it early in the page write stage. Better to write		 * no data than invalid data.		 */		/* Send command to read back the page */		if (col < mtd->eccsize)			nand_command(mtd, NAND_CMD_READ0, col, page);		else			nand_command(mtd, NAND_CMD_READ1, col - 256, page);		this->wait_for_ready();		/* Loop through and verify the data */		for (i = col; i < cnt; i++) {			if (this->data_buf[i] != this->read_data()) {				DEBUG(MTD_DEBUG_LEVEL0,					__FUNCTION__"(): Failed write verify, " \					"page 0x%08x, %6i bytes were succesful\n",					page, *retlen);				i = -EIO;				goto nand_write_exit;			}		}#endif		/* 		 * If we are writing a large amount of data and/or it		 * crosses page or half-page boundaries, we set the		 * the column to zero. It simplifies the program logic.		 */		if (col)			col = 0x00;		/* Update written bytes count */		*retlen += cnt;		/* Increment page address */		page++;			}	/* Return happy */	*retlen = len;	i = 0;nand_write_exit:	/* De-select the NAND device */	nand_deselect();	return i;}/* * NAND write witdh ECC, but only 1 sector! */static intnand_write_ecc(struct mtd_info *mtd, loff_t to, size_t len,               size_t *retlen, const u_char *buf, u_char *ecc_code){	int i, page, cnt, status, ret;	struct nand_chip *this = mtd->priv;	unsigned int sector_size, page_size, oob_size;	DEBUG(MTD_DEBUG_LEVEL3,		__FUNCTION__"(): to = 0x%08x, len = %i\n", (unsigned int)to,		(int)len);	sector_size = this->dev->szS;	page_size = mtd->oobblock;	oob_size = mtd->oobsize;	if (to & (sector_size - 1)) {		DEBUG(MTD_DEBUG_LEVEL0,			__FUNCTION__"(): Not Sector aligned\n");		return -EINVAL;	}	if (len != sector_size) {		DEBUG(MTD_DEBUG_LEVEL0,			__FUNCTION__"(): Only 1 Sector\n");		return -EINVAL;	}	/* Do not allow write past end of page */	if ((to + len) > mtd->size) {		DEBUG(MTD_DEBUG_LEVEL0,			__FUNCTION__"(): Attempted write past end of device\n");		return -EINVAL;	}	/* Shift to get page */	page = ((int) to) >> this->page_shift;	/* Initialize return length value */	*retlen = 0;	/* Select the NAND device */	nand_select();	/* Check the WP bit */	nand_command(mtd, NAND_CMD_STATUS, -1, -1);	this->wait_for_ready();	if (!(this->read_data() & SMC_STAT_NOT_WP)) {		DEBUG(MTD_DEBUG_LEVEL0,			__FUNCTION__"(): Device is write protected!!!\n");		ret = -EPERM;		goto nand_write_err;	}	/* Loop until all data is written */	while (*retlen < len) {		/* Send command to begin auto page programming */		nand_command(mtd, NAND_CMD_SEQIN, 0x00, page);		this->hwcontrol(NAND_CTL_DAT_OUT);		/* Write out complete page of data */		for (i = 0, cnt = 0; i < page_size; i++, cnt++)			this->write_data(buf[(*retlen) + cnt]);		/* Write ones for partial page programming */		for (i = 0; i < oob_size; i++) {#ifdef USE_256BYTE_NAND_FLASH			if (*retlen & (sector_size -1))				this->write_data(ecc_code[SMC_OOB256_SIZE + i]);			else#endif				this->write_data(ecc_code[i]);		}		this->hwcontrol(NAND_CTL_DAT_IN);		/* Send command to actually program the data */		nand_command(mtd, NAND_CMD_PAGEPROG, -1, -1);		this->wait_for_ready();		/*		 * Wait for program operation to complete. This could		 * take up to 3000us (3ms) on some devices, so we try		 * and exit as quickly as possible		 */		status = 0;		for (i = 0; i < 25; i++) {			/* Delay for 125us */			udelay(125);		    			/* Check the status */			nand_command(mtd, NAND_CMD_STATUS, -1, -1);			status = (int)this->read_data();			if (status & SMC_STAT_READY)				break;		}		/* See if device thins it succeeded */		if (status & SMC_STAT_WRITE_ERR) {			DEBUG(MTD_DEBUG_LEVEL0,				__FUNCTION__"(): Failed write, page 0x%08x, " \				"%6i bytes were succesful\n", page, *retlen);			ret = -EIO;			goto nand_write_err;		}#ifdef CONFIG_MTD_NAND_VERIFY_WRITE		/*		 * The NAND device assumes that it is always writing to		 * a cleanly erased page. Hence, it performs its internal		 * write verification only on bits tha transitioned from		 * 1 to 0. The device does NOT verify the whole page on a		 * byte by byte basis. It is possible that the page was		 * not completely erased or the page is becoming unusable		 * due to wear. The read with ECC would catch the error		 * later when the ECC page check fails, but we would rather		 * catch it early in the page write stage. Better to write		 * no data than invalid data.		 */		/* Send command to read back the page */#ifdef USE_256BYTE_NAND_FLASH		if (*retlen & (sector_size - 1))			nand_command(mtd, NAND_CMD_READ0, 0x00, page + 1);		else#endif			nand_command(mtd, NAND_CMD_READ0, 0x00, page);		this->wait_for_ready();		/* Loop through and verify the data */		for (i = 0; i < page_size; i++) {			if (this->data_buf[i] != this->read_data()) {				DEBUG(MTD_DEBUG_LEVEL0,					__FUNCTION__"(): Failed write verify, " \					"page 0x%08x, %6i bytes were succesful\n",					page, *retlen);				ret = -EIO;				goto nand_write_err;			}		}#endif		/* Update written bytes count */		*retlen += cnt;		/* Increment page address */		page++;	}	*retlen = len;	ret = 0;nand_write_err:	/* De-select the NAND device */	nand_deselect();	return ret;}/* * NAND write out-of-band */static intnand_write_oob(struct mtd_info *mtd, loff_t to, size_t len,               size_t *retlen, const u_char *buf){	int i, offset, page, status, ret;	struct nand_chip *this = mtd->priv;	DEBUG(MTD_DEBUG_LEVEL3,		__FUNCTION__"(): to = 0x%08x, len = %i\n", (unsigned int)to,		(int)len);	/* Shift to get page */	page = ((int)to) >> this->page_shift;