* @param mtd		nand mtd instance * @param offset	page address to query (muss be page aligned!) * * @return		-1 in case of error *			>0 lock status: *			  bitfield with the following combinations: *			  NAND_LOCK_STATUS_TIGHT: page in tight state *			  NAND_LOCK_STATUS_LOCK:  page locked *			  NAND_LOCK_STATUS_UNLOCK: page unlocked * */int nand_get_lock_status(struct mtd_info *mtd, ulong offset){	int ret = 0;	int chipnr;	int page;	struct nand_chip *chip = mtd->priv;	/* select the NAND device */	chipnr = (int)(offset >> chip->chip_shift);	chip->select_chip(mtd, chipnr);	if ((offset & (mtd->writesize - 1)) != 0) {		printf ("nand_get_lock_status: "			"Start address must be beginning of "			"nand page!\n");		ret = -1;		goto out;	}	/* check the Lock Status */	page = (int)(offset >> chip->page_shift);	chip->cmdfunc(mtd, NAND_CMD_LOCK_STATUS, -1, page & chip->pagemask);	ret = chip->read_byte(mtd) & (NAND_LOCK_STATUS_TIGHT					  | NAND_LOCK_STATUS_LOCK					  | NAND_LOCK_STATUS_UNLOCK); out:	/* de-select the NAND device */	chip->select_chip(mtd, -1);	return ret;}/** * nand_unlock: - Unlock area of NAND pages *		  only one consecutive area can be unlocked at one time! * * @param mtd		nand mtd instance * @param start		start byte address * @param length	number of bytes to unlock (must be a multiple of *			page size nand->writesize) * * @return		0 on success, -1 in case of error */int nand_unlock(struct mtd_info *mtd, ulong start, ulong length){	int ret = 0;	int chipnr;	int status;	int page;	struct nand_chip *chip = mtd->priv;	printf ("nand_unlock: start: %08x, length: %d!\n",		(int)start, (int)length);	/* select the NAND device */	chipnr = (int)(start >> chip->chip_shift);	chip->select_chip(mtd, chipnr);	/* check the WP bit */	chip->cmdfunc(mtd, NAND_CMD_STATUS, -1, -1);	if (!(chip->read_byte(mtd) & NAND_STATUS_WP)) {		printf ("nand_unlock: Device is write protected!\n");		ret = -1;		goto out;	}	if ((start & (mtd->erasesize - 1)) != 0) {		printf ("nand_unlock: Start address must be beginning of "			"nand block!\n");		ret = -1;		goto out;	}	if (length == 0 || (length & (mtd->erasesize - 1)) != 0) {		printf ("nand_unlock: Length must be a multiple of nand block "			"size %08x!\n", mtd->erasesize);		ret = -1;		goto out;	}	/*	 * Set length so that the last address is set to the	 * starting address of the last block	 */	length -= mtd->erasesize;	/* submit address of first page to unlock */	page = (int)(start >> chip->page_shift);	chip->cmdfunc(mtd, NAND_CMD_UNLOCK1, -1, page & chip->pagemask);	/* submit ADDRESS of LAST page to unlock */	page += (int)(length >> chip->page_shift);	chip->cmdfunc(mtd, NAND_CMD_UNLOCK2, -1, page & chip->pagemask);	/* call wait ready function */	status = chip->waitfunc(mtd, chip);	/* see if device thinks it succeeded */	if (status & 0x01) {		/* there was an error */		ret = -1;		goto out;	} out:	/* de-select the NAND device */	chip->select_chip(mtd, -1);	return ret;}#endif/** * get_len_incl_bad * * Check if length including bad blocks fits into device. * * @param nand NAND device * @param offset offset in flash * @param length image length * @return image length including bad blocks */static size_t get_len_incl_bad (nand_info_t *nand, size_t offset,				const size_t length){	size_t len_incl_bad = 0;	size_t len_excl_bad = 0;	size_t block_len;	while (len_excl_bad < length) {		block_len = nand->erasesize - (offset & (nand->erasesize - 1));		if (!nand_block_isbad (nand, offset & ~(nand->erasesize - 1)))			len_excl_bad += block_len;		len_incl_bad += block_len;		offset       += block_len;		if ((offset + len_incl_bad) >= nand->size)			break;	}	return len_incl_bad;}/** * nand_write_skip_bad: * * Write image to NAND flash. * Blocks that are marked bad are skipped and the is written to the next * block instead as long as the image is short enough to fit even after * skipping the bad blocks. * * @param nand  	NAND device * @param offset	offset in flash * @param length	buffer length * @param buf           buffer to read from * @return		0 in case of success */int nand_write_skip_bad(nand_info_t *nand, size_t offset, size_t *length,			u_char *buffer){	int rval;	size_t left_to_write = *length;	size_t len_incl_bad;	u_char *p_buffer = buffer;	/* Reject writes, which are not page aligned */	if ((offset & (nand->writesize - 1)) != 0 ||	    (*length & (nand->writesize - 1)) != 0) {		printf ("Attempt to write non page aligned data\n");		return -EINVAL;	}	len_incl_bad = get_len_incl_bad (nand, offset, *length);	if ((offset + len_incl_bad) >= nand->size) {		printf ("Attempt to write outside the flash area\n");		return -EINVAL;	}	if (len_incl_bad == *length) {		rval = nand_write (nand, offset, length, buffer);		if (rval != 0)			printf ("NAND write to offset %zx failed %d\n",				offset, rval);		return rval;	}	while (left_to_write > 0) {		size_t block_offset = offset & (nand->erasesize - 1);		size_t write_size;		if (nand_block_isbad (nand, offset & ~(nand->erasesize - 1))) {			printf ("Skip bad block 0x%08zx\n",				offset & ~(nand->erasesize - 1));			offset += nand->erasesize - block_offset;			continue;		}		if (left_to_write < (nand->erasesize - block_offset))			write_size = left_to_write;		else			write_size = nand->erasesize - block_offset;		rval = nand_write (nand, offset, &write_size, p_buffer);		if (rval != 0) {			printf ("NAND write to offset %zx failed %d\n",				offset, rval);			*length -= left_to_write;			return rval;		}		left_to_write -= write_size;		offset        += write_size;		p_buffer      += write_size;	}	return 0;}/** * nand_read_skip_bad: * * Read image from NAND flash. * Blocks that are marked bad are skipped and the next block is readen * instead as long as the image is short enough to fit even after skipping the * bad blocks. * * @param nand NAND device * @param offset offset in flash * @param length buffer length, on return holds remaining bytes to read * @param buffer buffer to write to * @return 0 in case of success */int nand_read_skip_bad(nand_info_t *nand, size_t offset, size_t *length,		       u_char *buffer){	int rval;	size_t left_to_read = *length;	size_t len_incl_bad;	u_char *p_buffer = buffer;	len_incl_bad = get_len_incl_bad (nand, offset, *length);	if ((offset + len_incl_bad) >= nand->size) {		printf ("Attempt to read outside the flash area\n");		return -EINVAL;	}	if (len_incl_bad == *length) {		rval = nand_read (nand, offset, length, buffer);		if (rval != 0)			printf ("NAND read from offset %zx failed %d\n",				offset, rval);		return rval;	}	while (left_to_read > 0) {		size_t block_offset = offset & (nand->erasesize - 1);		size_t read_length;		if (nand_block_isbad (nand, offset & ~(nand->erasesize - 1))) {			printf ("Skipping bad block 0x%08zx\n",				offset & ~(nand->erasesize - 1));			offset += nand->erasesize - block_offset;			continue;		}		if (left_to_read < (nand->erasesize - block_offset))			read_length = left_to_read;		else			read_length = nand->erasesize - block_offset;		rval = nand_read (nand, offset, &read_length, p_buffer);		if (rval != 0) {			printf ("NAND read from offset %zx failed %d\n",				offset, rval);			*length -= left_to_read;			return rval;		}		left_to_read -= read_length;		offset       += read_length;		p_buffer     += read_length;	}	return 0;}