[MTD] [OneNAND] Add write-while-program support
OneNAND write-while-program method of writing improves performance, compared with ordinary writes, by transferring data to OneNAND's RAM buffers atthe same time as programming the NAND core. When writing several NAND pages at a time, an improvement of 12% to 25% is seen. Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Adrian Hunter <adrian.hunter@nokia.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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a29f280b73
Коммит
9ce969082e
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@ -1455,7 +1455,8 @@ static int onenand_write_ops_nolock(struct mtd_info *mtd, loff_t to,
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struct mtd_oob_ops *ops)
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{
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struct onenand_chip *this = mtd->priv;
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int written = 0, column, thislen, subpage;
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int written = 0, column, thislen = 0, subpage = 0;
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int prev = 0, prevlen = 0, prev_subpage = 0, first = 1;
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int oobwritten = 0, oobcolumn, thisooblen, oobsize;
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size_t len = ops->len;
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size_t ooblen = ops->ooblen;
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@ -1482,6 +1483,10 @@ static int onenand_write_ops_nolock(struct mtd_info *mtd, loff_t to,
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return -EINVAL;
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}
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/* Check zero length */
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if (!len)
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return 0;
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if (ops->mode == MTD_OOB_AUTO)
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oobsize = this->ecclayout->oobavail;
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else
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@ -1492,79 +1497,121 @@ static int onenand_write_ops_nolock(struct mtd_info *mtd, loff_t to,
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column = to & (mtd->writesize - 1);
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/* Loop until all data write */
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while (written < len) {
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u_char *wbuf = (u_char *) buf;
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while (1) {
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if (written < len) {
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u_char *wbuf = (u_char *) buf;
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thislen = min_t(int, mtd->writesize - column, len - written);
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thisooblen = min_t(int, oobsize - oobcolumn, ooblen - oobwritten);
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thislen = min_t(int, mtd->writesize - column, len - written);
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thisooblen = min_t(int, oobsize - oobcolumn, ooblen - oobwritten);
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cond_resched();
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cond_resched();
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this->command(mtd, ONENAND_CMD_BUFFERRAM, to, thislen);
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this->command(mtd, ONENAND_CMD_BUFFERRAM, to, thislen);
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/* Partial page write */
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subpage = thislen < mtd->writesize;
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if (subpage) {
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memset(this->page_buf, 0xff, mtd->writesize);
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memcpy(this->page_buf + column, buf, thislen);
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wbuf = this->page_buf;
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}
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/* Partial page write */
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subpage = thislen < mtd->writesize;
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if (subpage) {
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memset(this->page_buf, 0xff, mtd->writesize);
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memcpy(this->page_buf + column, buf, thislen);
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wbuf = this->page_buf;
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}
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this->write_bufferram(mtd, ONENAND_DATARAM, wbuf, 0, mtd->writesize);
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this->write_bufferram(mtd, ONENAND_DATARAM, wbuf, 0, mtd->writesize);
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if (oob) {
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oobbuf = this->oob_buf;
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if (oob) {
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oobbuf = this->oob_buf;
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/* We send data to spare ram with oobsize
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* to prevent byte access */
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memset(oobbuf, 0xff, mtd->oobsize);
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if (ops->mode == MTD_OOB_AUTO)
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onenand_fill_auto_oob(mtd, oobbuf, oob, oobcolumn, thisooblen);
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else
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memcpy(oobbuf + oobcolumn, oob, thisooblen);
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/* We send data to spare ram with oobsize
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* to prevent byte access */
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memset(oobbuf, 0xff, mtd->oobsize);
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if (ops->mode == MTD_OOB_AUTO)
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onenand_fill_auto_oob(mtd, oobbuf, oob, oobcolumn, thisooblen);
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else
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memcpy(oobbuf + oobcolumn, oob, thisooblen);
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oobwritten += thisooblen;
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oob += thisooblen;
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oobcolumn = 0;
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oobwritten += thisooblen;
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oob += thisooblen;
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oobcolumn = 0;
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} else
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oobbuf = (u_char *) ffchars;
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this->write_bufferram(mtd, ONENAND_SPARERAM, oobbuf, 0, mtd->oobsize);
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} else
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oobbuf = (u_char *) ffchars;
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ONENAND_SET_NEXT_BUFFERRAM(this);
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this->write_bufferram(mtd, ONENAND_SPARERAM, oobbuf, 0, mtd->oobsize);
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/*
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* 2 PLANE, MLC, and Flex-OneNAND doesn't support
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* write-while-programe feature.
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*/
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if (!ONENAND_IS_2PLANE(this) && !first) {
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ONENAND_SET_PREV_BUFFERRAM(this);
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ret = this->wait(mtd, FL_WRITING);
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/* In partial page write we don't update bufferram */
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onenand_update_bufferram(mtd, prev, !ret && !prev_subpage);
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if (ret) {
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written -= prevlen;
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printk(KERN_ERR "onenand_write_ops_nolock: write filaed %d\n", ret);
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break;
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}
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if (written == len) {
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/* Only check verify write turn on */
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ret = onenand_verify(mtd, buf - len, to - len, len);
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if (ret)
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printk(KERN_ERR "onenand_write_ops_nolock: verify failed %d\n", ret);
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break;
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}
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ONENAND_SET_NEXT_BUFFERRAM(this);
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}
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this->command(mtd, ONENAND_CMD_PROG, to, mtd->writesize);
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ret = this->wait(mtd, FL_WRITING);
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/* In partial page write we don't update bufferram */
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onenand_update_bufferram(mtd, to, !ret && !subpage);
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/*
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* 2 PLANE, MLC, and Flex-OneNAND wait here
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*/
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if (ONENAND_IS_2PLANE(this)) {
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ONENAND_SET_BUFFERRAM1(this);
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onenand_update_bufferram(mtd, to + this->writesize, !ret && !subpage);
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}
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ret = this->wait(mtd, FL_WRITING);
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if (ret) {
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printk(KERN_ERR "onenand_write_ops_nolock: write filaed %d\n", ret);
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break;
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}
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/* In partial page write we don't update bufferram */
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onenand_update_bufferram(mtd, to, !ret && !subpage);
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if (ret) {
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printk(KERN_ERR "onenand_write_ops_nolock: write filaed %d\n", ret);
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break;
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}
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/* Only check verify write turn on */
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ret = onenand_verify(mtd, buf, to, thislen);
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if (ret) {
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printk(KERN_ERR "onenand_write_ops_nolock: verify failed %d\n", ret);
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break;
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}
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/* Only check verify write turn on */
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ret = onenand_verify(mtd, buf, to, thislen);
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if (ret) {
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printk(KERN_ERR "onenand_write_ops_nolock: verify failed %d\n", ret);
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break;
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}
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written += thislen;
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written += thislen;
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if (written == len)
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break;
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if (written == len)
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break;
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} else
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written += thislen;
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column = 0;
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prev_subpage = subpage;
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prev = to;
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prevlen = thislen;
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to += thislen;
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buf += thislen;
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first = 0;
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}
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/* In error case, clear all bufferrams */
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if (written != len)
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onenand_invalidate_bufferram(mtd, 0, -1);
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ops->retlen = written;
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ops->oobretlen = oobwritten;
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return ret;
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}
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