nand_base.c

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	bufstart = (u_char *)buf;

	/* Loop until all data is written */
	while (written < len) {

		this->data_poi = (u_char*) &buf[written];
		/* Write one page. If this is the last page to write
		 * or the last page in this block, then use the
		 * real pageprogram command, else select cached programming
		 * if supported by the chip.
		 */
		ret = nand_write_page (mtd, this, page, &oobbuf[oob], oobsel, (--numpages > 0));
		if (ret) {
			DEBUG (MTD_DEBUG_LEVEL0, "nand_write_ecc: write_page failed %d\n", ret);
			goto out;
		}
		/* Next oob page */
		oob += mtd->oobsize;
		/* Update written bytes count */
		written += mtd->oobblock;
		if (written == len)
			goto cmp;

		/* Increment page address */
		page++;

		/* Have we hit a block boundary ? Then we have to verify and
		 * if verify is ok, we have to setup the oob buffer for
		 * the next pages.
		*/
		if (!(page & (ppblock - 1))){
			int ofs;
			this->data_poi = bufstart;
			ret = nand_verify_pages (mtd, this, startpage,
				page - startpage,
				oobbuf, oobsel, chipnr, (eccbuf != NULL));
			if (ret) {
				DEBUG (MTD_DEBUG_LEVEL0, "nand_write_ecc: verify_pages failed %d\n", ret);
				goto out;
			}
			*retlen = written;

			ofs = autoplace ? mtd->oobavail : mtd->oobsize;
			if (eccbuf)
				eccbuf += (page - startpage) * ofs;
			totalpages -= page - startpage;
			numpages = min (totalpages, ppblock);
			page &= this->pagemask;
			startpage = page;
			oobbuf = nand_prepare_oobbuf (mtd, eccbuf, oobsel,
					autoplace, numpages);
			oob = 0;
			/* Check, if we cross a chip boundary */
			if (!page) {
				chipnr++;
				this->select_chip(mtd, -1);
				this->select_chip(mtd, chipnr);
			}
		}
	}
	/* Verify the remaining pages */
cmp:
	this->data_poi = bufstart;
 	ret = nand_verify_pages (mtd, this, startpage, totalpages,
		oobbuf, oobsel, chipnr, (eccbuf != NULL));
	if (!ret)
		*retlen = written;
	else
		DEBUG (MTD_DEBUG_LEVEL0, "nand_write_ecc: verify_pages failed %d\n", ret);

out:
	/* Deselect and wake up anyone waiting on the device */
	nand_release_device(mtd);

	return ret;
}


/**
 * nand_write_oob - [MTD Interface] NAND write out-of-band
 * @mtd:	MTD device structure
 * @to:		offset to write to
 * @len:	number of bytes to write
 * @retlen:	pointer to variable to store the number of written bytes
 * @buf:	the data to write
 *
 * NAND write out-of-band
 */
static int nand_write_oob (struct mtd_info *mtd, loff_t to, size_t len, size_t * retlen, const u_char * oob_buf)
{
	int column, page, status, ret = -EIO, chipnr, eccsteps; 
	struct nand_chip *this = mtd->priv;

	DEBUG (MTD_DEBUG_LEVEL3, "%s: to = 0x%08x, len = %i\n", __FUNCTION__, (unsigned int) to, (int) len);

	/* Shift to get page */
	page = (int) (to >> this->page_shift);
	chipnr = (int) (to >> this->chip_shift);

	/* Mask to get column */
	column = to & (mtd->oobsize - 1);

	/* Initialize return length value */
	*retlen = 0;

	/* Do not allow write past end of page */
	if ((column + len) > mtd->oobsize) {
		DEBUG (MTD_DEBUG_LEVEL0, "%s: Attempt to write past end of page\n", __FUNCTION__);
		return -EINVAL;
	}

	/* Grab the lock and see if the device is available */
	nand_get_device (this, mtd, FL_WRITING);

	/* Select the NAND device */
	this->select_chip(mtd, chipnr);

	/* Reset the chip. Some chips (like the Toshiba TC5832DC found
	   in one of my DiskOnChip 2000 test units) will clear the whole
	   data page too if we don't do this. I have no clue why, but
	   I seem to have 'fixed' it in the doc2000 driver in
	   August 1999.  dwmw2. */
	this->cmdfunc(mtd, NAND_CMD_RESET, -1, -1);

	/* Check, if it is write protected */
	if (nand_check_wp(mtd))
		goto out;

	/* Invalidate the page cache, if we write to the cached page */
	if (page == this->pagebuf)
		this->pagebuf = -1;

	if (this->eccmode == NAND_ECC_SOFT || this->eccmode == NAND_ECC_NONE) {
		if (NAND_MUST_PAD(this)) {
			/* Write out desired data */
			this->cmdfunc (mtd, NAND_CMD_SEQIN, mtd->oobblock, page & this->pagemask);
			/* prepad 0xff for partial programming */
			this->write_buf(mtd, ffchars, column);
			/* write data */
			this->write_buf(mtd, oob_buf, len);
			/* postpad 0xff for partial programming */
			this->write_buf(mtd, ffchars, mtd->oobsize - (len+column));
		} else {
			/* Write out desired data */
			this->cmdfunc (mtd, NAND_CMD_SEQIN, mtd->oobblock + column, page & this->pagemask);
			/* write data */
			this->write_buf(mtd, oob_buf, len);
		}
	} else {
		int i = 0, j = 0;
		int fflen = 0, old_fflen = 0, ooblen = 0;

		/* Write out desired data */
		this->cmdfunc (mtd, NAND_CMD_SEQIN, 0, page & this->pagemask);

		eccsteps = this->eccsteps;
		for (j = 0; this->layout[j].length; j++) {
			switch (this->layout[j].type) {
			case ITEM_TYPE_DATA:
				if (this->options & NAND_COMPLEX_OOB_WRITE) {
					this->enable_hwecc(mtd, NAND_ECC_WRITE);
					this->write_buf(mtd, ffchars, this->layout[j].length);
					fflen += this->layout[j].length;
				} else {
					if (old_fflen < fflen) {
						this->cmdfunc (mtd, NAND_CMD_PAGEPROG, -1, -1);
						status = this->waitfunc (mtd, this, FL_WRITING);
						if (status & NAND_STATUS_FAIL) {
							DEBUG (MTD_DEBUG_LEVEL0, "%s: Failed write, page 0x%08x\n", __FUNCTION__, page);
							ret = -EIO;
							goto out;
						}
					}
					fflen += this->layout[j].length;
					if (this->options & NAND_BUSWIDTH_16 && (fflen + ooblen) & 1)
						this->cmdfunc (mtd, NAND_CMD_SEQIN, fflen + ooblen - 1, page & this->pagemask);
					else
						this->cmdfunc (mtd, NAND_CMD_SEQIN, fflen + ooblen, page & this->pagemask);
					old_fflen = fflen;
				}
				break;

			case ITEM_TYPE_ECC:
			case ITEM_TYPE_OOB:
				if (this->layout[j].type == ITEM_TYPE_ECC)
					this->enable_hwecc(mtd, NAND_ECC_WRITESYN);
				else
					this->enable_hwecc(mtd, NAND_ECC_WRITEOOB);
				i = min_t(int, column, this->layout[j].length);
				if (i) {
					if (this->options & NAND_BUSWIDTH_16 && i & 1)
						i--;
					if (i == 0) {
						this->write_word(mtd, cpu_to_le16((oob_buf[0] << 8) | 0xff));
						i++;
						ooblen++;
					} else
						this->write_buf(mtd, ffchars, i);
				}
				column -= i;
				fflen += i;
				i = min_t(int, len + column - ooblen, this->layout[j].length - i);
				if (i) {
					if (column) {
						this->write_word(mtd, cpu_to_le16((oob_buf[0] << 8) | 0xff));
						i--;
						ooblen++;
					}
					if (i & 1)
						i--;
					this->write_buf(mtd, &oob_buf[ooblen], i);
				}
				ooblen += i;
				if (ooblen == len - 1) {
					this->write_word(mtd, cpu_to_le16(oob_buf[ooblen]) | 0xff00);
					ooblen += 2;
				}
				if (ooblen >= len) {
					if (NAND_MUST_PAD(this))
						this->write_buf(mtd, ffchars, mtd->oobsize + mtd->oobblock - fflen - ooblen);
					goto finish;
				}
				break;
			}
		}
	}
finish:
	/* Send command to program the OOB data */
	this->cmdfunc (mtd, NAND_CMD_PAGEPROG, -1, -1);

	status = this->waitfunc (mtd, this, FL_WRITING);

	/* See if device thinks it succeeded */
	if (status & NAND_STATUS_FAIL) {
		DEBUG (MTD_DEBUG_LEVEL0, "%s: Failed write, page 0x%08x\n", __FUNCTION__, page);
		ret = -EIO;
		goto out;
	}
	/* Return happy */
	*retlen = len;

#ifdef CONFIG_MTD_NAND_VERIFY_WRITE
	if (this->eccmode == NAND_ECC_SOFT || this->eccmode == NAND_ECC_NONE) {
		/* Send command to read back the data */
		this->cmdfunc (mtd, NAND_CMD_READOOB, column, page & this->pagemask);

		if (this->verify_buf(mtd, oob_buf, len)) {
			DEBUG (MTD_DEBUG_LEVEL0, "nand_write_oob: " "Failed write verify, page 0x%08x\n", page);
			ret = -EIO;
			goto out;
		}
	}
#warning "Verify for OOB data in HW ECC case is NOT YET implemented"
#endif
	ret = 0;
out:
	/* Deselect and wake up anyone waiting on the device */
	nand_release_device(mtd);

	return ret;
}

/**
 * nand_writev - [MTD Interface] compabilty function for nand_writev_ecc
 * @mtd:	MTD device structure
 * @vecs:	the iovectors to write
 * @count:	number of vectors
 * @to:		offset to write to
 * @retlen:	pointer to variable to store the number of written bytes
 *
 * NAND write with kvec. This just calls the ecc function
 */
static int nand_writev (struct mtd_info *mtd, const struct kvec *vecs, unsigned long count,
		loff_t to, size_t * retlen)
{
	return (nand_writev_ecc (mtd, vecs, count, to, retlen, NULL, NULL));
}

/**
 * nand_writev_ecc - [MTD Interface] write with iovec with ecc
 * @mtd:	MTD device structure
 * @vecs:	the iovectors to write
 * @count:	number of vectors
 * @to:		offset to write to
 * @retlen:	pointer to variable to store the number of written bytes
 * @eccbuf:	filesystem supplied oob data buffer
 * @oobsel:	oob selection structure
 *
 * NAND write with iovec with ecc
 */
static int nand_writev_ecc (struct mtd_info *mtd, const struct kvec *vecs, unsigned long count,
		loff_t to, size_t * retlen, u_char *eccbuf, struct nand_oobinfo *oobsel)
{
	int i, page, len, total_len, ret = -EIO, written = 0, chipnr;
	int oob, numpages, autoplace = 0, startpage;
	struct nand_chip *this = mtd->priv;
	int	ppblock = (1 << (this->phys_erase_shift - this->page_shift));
	u_char *oobbuf, *bufstart;

	/* Preset written len for early exit */
	*retlen = 0;

	/* Calculate total length of data */
	total_len = 0;
	for (i = 0; i < count; i++)
		total_len += (int) vecs[i].iov_len;

	DEBUG (MTD_DEBUG_LEVEL3,
	       "nand_writev: to = 0x%08x, len = %i, count = %ld\n", (unsigned int) to, (unsigned int) total_len, count);

	/* Do not allow write past end of page */
	if ((to + total_len) > mtd->size) {
		DEBUG (MTD_DEBUG_LEVEL0, "nand_writev: Attempted write past end of device\n");
		return -EINVAL;
	}

	/* reject writes, which are not page aligned */
	if (NOTALIGNED (to) || NOTALIGNED(total_len)) {
		printk (KERN_NOTICE "nand_write_ecc: Attempt to write not page aligned data\n");
		return -EINVAL;
	}

	/* Grab the lock and see if the device is available */
	nand_get_device (this, mtd, FL_WRITING);

	/* Get the current chip-nr */
	chipnr = (int) (to >> this->chip_shift);
	/* Select the NAND device */
	this->select_chip(mtd, chipnr);

	/* Check, if it is write protected */
	if (nand_check_wp(mtd))
		goto out;

	/* if oobsel is NULL, use chip defaults */
	if (oobsel == NULL)
		oobsel = &mtd->oobinfo;

	/* Autoplace of oob data ? Use the default placement scheme */
	if (oobsel->useecc == MTD_NANDECC_AUTOPLACE) {
		oobsel = this->autooob;
		autoplace = 1;
	}
	if (oobsel->useecc == MTD_NANDECC_AUTOPL_USR)
		autoplace = 1;

	/* Setup start page */
	page = (int) (to >> this->page_shift);
	/* Invalidate the page cache, if we write to the cached page */
	if (page <= this->pagebuf && this->pagebuf < ((to + total_len) >> this->page_shift))
		this->pagebuf = -1;

	startpage = page & this->pagemask;

	/* Loop until all kvec' data has been written */
	len = 0;
	while (count) {
		/* If the given tuple is >= pagesize then
		 * write it out from the iov
		 */
		if ((vecs->iov_len - len) >= mtd->oobblock) {
			/* Calc number of pages we can write
			 * out of this iov in one go */
			numpages = (vecs->iov_len - len) >> this->page_shift;
			/* Do not cross block boundaries */
			numpages = min (ppblock - (startpage & (ppblock - 1)), numpages);
			oobbuf = nand_prepare_oobbuf (mtd, NULL, oobsel, autoplace, numpages);
			bufstart = (u_char *)vecs->iov_base;
			bufstart += len;
			this->data_poi = bufstart;
			oob = 0;
			for (i = 1; i <= numpages; i++) {
				/* Write one page. If this is the last page to write
				 * then use the real pageprogram command, else select
				 * cached programming if supported by the chip.
				 */
				ret = nand_write_page (mtd, this, page & this->pagemask,
					&oobbuf[oob], oobsel, i != numpages);
				if (ret)
					goto out;
				this->data_poi += mtd->oobblock;
				len += mtd->oobblock;
				oob += mtd->oobsize;
				page++;
			}
			/* Check, if we have to switch to the next tuple */
			if (len >= (int) vecs->iov_len) {
				vecs++;
				len = 0;
				count--;
			}
		} else {
			/* We must use the internal buffer, read data out of each
			 * tuple until we have a full page to write
			 */
			int cnt = 0;
			while (cnt < mtd->oobblock) {
				if (vecs->iov_base != NULL && vecs->iov_len)
					this->data_buf[cnt++] = ((u_char *) vecs->iov_base)[len++];
				/* Check, if we have to switch to the next tuple */
				if (len >= (int) vecs->iov_len) {
					vecs++;
					len = 0;
					count--;
				}
			}
			this->pagebuf = page;
			this->data_poi = this->data_buf;
			bufstart = this->data_poi;
			numpages = 1;
			oobbuf = nand_prepare_oobbuf (mtd, NULL, oobsel, autoplace, numpages);
			ret = nand_write_page (mtd, this, page & this->pagemask,
				oobbuf, oobsel, 0);
			if (ret)
				goto out;
			page++;
		}

		this->data_poi = bufstart;
		ret = nand_verify_pages (mtd, this, startpage, numpages, oobbuf, oobsel, chipnr, 0);
		if (ret)
			goto out;

		written += mtd->oobblock * numpages;
		/* All done ? */
		if (!count)
			break;

		startpage = page & this->pagemask;
		/* Check, if we cross a chip boundary */
		if (!startpage) {
			chipnr++;
			this->select_chip(mtd, -1);
			this->select_chip(mtd, chipnr);
		}
	}
	ret = 0;
out:
	/* Deselect and wake up anyone waiting on the device */
	nand_release_device(mtd);

	*retlen = written;
	return ret;
}

/**
 * single_erease_