From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailout1.samsung.com ([203.254.224.24]) by bombadil.infradead.org with esmtp (Exim 4.68 #1 (Red Hat Linux)) id 1L0mYH-0005aj-CZ for linux-mtd@lists.infradead.org; Fri, 14 Nov 2008 00:28:46 +0000 Received: from epmmp1 (mailout1.samsung.com [203.254.224.24]) by mailout1.samsung.com (iPlanet Messaging Server 5.2 Patch 2 (built Jul 14 2004)) with ESMTP id <0KAA000JIRZLUK@mailout1.samsung.com> for linux-mtd@lists.infradead.org; Fri, 14 Nov 2008 09:28:33 +0900 (KST) Received: from spapp01.rdscm.com ([165.213.149.150]) by mmp1.samsung.com (iPlanet Messaging Server 5.2 Patch 2 (built Jul 14 2004)) with ESMTPA id <0KAA00LRZRZJHW@mmp1.samsung.com> for linux-mtd@lists.infradead.org; Fri, 14 Nov 2008 09:28:31 +0900 (KST) Date: Fri, 14 Nov 2008 09:28:30 +0900 From: Kyungmin Park Subject: [PATCH][OneNAND] Write-while-program support To: linux-mtd@lists.infradead.org Message-id: <20081114002830.GA25979@july> MIME-version: 1.0 Content-type: text/plain; charset=us-ascii Content-transfer-encoding: 7BIT Content-disposition: inline Cc: ext-adrian.hunter@nokia.com List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , This is from Adrian hunter and modified for write_ops operation. It's similar with load-while-read method. but it's write side performance improvement. Here's brief performance results. Note: Measured from OMAP3 with async OneNAND mode. (not sync mode) ================================================================= speedtest: dev = 3 speedtest: Size=16777216 EB size=131072 Write size=2048 EB count=128 Pages per EB=64 Page size=2048 speedtest: scanning for bad blocks speedtest: scanned 0 speedtest: scanned 128, found 0 bad speedtest: erasing speedtest: erased 0 speedtest: erased 128 speedtest: Testing eraseblock write speed eraseblock write speed is 2424 KiB/s speedtest: Testing eraseblock read speed eraseblock read speed is 11985 KiB/s speedtest: Testing page write speed page write speed is 2493 KiB/s speedtest: Testing page read speed page read speed is 11586 KiB/s speedtest: Testing 2 page write speed 2 page write speed is 2681 KiB/s speedtest: Testing 2 page read speed 2 page read speed is 10922 KiB/s speedtest: Testing erase speed erase speed is 192752 KiB/s speedtest: speedtest finished ================================================================= Also it's passed all nand-tests. Signed-off-by: Adrian Hunter Signed-off-by: Kyungmin Park --- diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c index aaf3504..bc9b420 100644 --- a/drivers/mtd/onenand/onenand_base.c +++ b/drivers/mtd/onenand/onenand_base.c @@ -1455,7 +1455,8 @@ static int onenand_write_ops_nolock(struct mtd_info *mtd, loff_t to, struct mtd_oob_ops *ops) { struct onenand_chip *this = mtd->priv; - int written = 0, column, thislen, subpage; + int written = 0, column, thislen = 0, subpage = 0; + int prev = 0, prevlen = 0, prev_subpage = 0, first = 1; int oobwritten = 0, oobcolumn, thisooblen, oobsize; size_t len = ops->len; size_t ooblen = ops->ooblen; @@ -1492,76 +1493,90 @@ static int onenand_write_ops_nolock(struct mtd_info *mtd, loff_t to, column = to & (mtd->writesize - 1); /* Loop until all data write */ - while (written < len) { - u_char *wbuf = (u_char *) buf; + while (1) { + if (written < len) { + u_char *wbuf = (u_char *) buf; - thislen = min_t(int, mtd->writesize - column, len - written); - thisooblen = min_t(int, oobsize - oobcolumn, ooblen - oobwritten); + thislen = min_t(int, mtd->writesize - column, len - written); + thisooblen = min_t(int, oobsize - oobcolumn, ooblen - oobwritten); - cond_resched(); + cond_resched(); - this->command(mtd, ONENAND_CMD_BUFFERRAM, to, thislen); + this->command(mtd, ONENAND_CMD_BUFFERRAM, to, thislen); - /* Partial page write */ - subpage = thislen < mtd->writesize; - if (subpage) { - memset(this->page_buf, 0xff, mtd->writesize); - memcpy(this->page_buf + column, buf, thislen); - wbuf = this->page_buf; - } + /* Partial page write */ + subpage = thislen < mtd->writesize; + if (subpage) { + memset(this->page_buf, 0xff, mtd->writesize); + memcpy(this->page_buf + column, buf, thislen); + wbuf = this->page_buf; + } - this->write_bufferram(mtd, ONENAND_DATARAM, wbuf, 0, mtd->writesize); + this->write_bufferram(mtd, ONENAND_DATARAM, wbuf, 0, mtd->writesize); - if (oob) { - oobbuf = this->oob_buf; + if (oob) { + oobbuf = this->oob_buf; - /* We send data to spare ram with oobsize - * to prevent byte access */ - memset(oobbuf, 0xff, mtd->oobsize); - if (ops->mode == MTD_OOB_AUTO) - onenand_fill_auto_oob(mtd, oobbuf, oob, oobcolumn, thisooblen); - else - memcpy(oobbuf + oobcolumn, oob, thisooblen); + /* We send data to spare ram with oobsize + * to prevent byte access */ + memset(oobbuf, 0xff, mtd->oobsize); + if (ops->mode == MTD_OOB_AUTO) + onenand_fill_auto_oob(mtd, oobbuf, oob, oobcolumn, thisooblen); + else + memcpy(oobbuf + oobcolumn, oob, thisooblen); - oobwritten += thisooblen; - oob += thisooblen; - oobcolumn = 0; + oobwritten += thisooblen; + oob += thisooblen; + oobcolumn = 0; + } else + oobbuf = (u_char *) ffchars; + + this->write_bufferram(mtd, ONENAND_SPARERAM, oobbuf, 0, mtd->oobsize); } else - oobbuf = (u_char *) ffchars; + ONENAND_SET_NEXT_BUFFERRAM(this); - this->write_bufferram(mtd, ONENAND_SPARERAM, oobbuf, 0, mtd->oobsize); + if (!first) { + ONENAND_SET_PREV_BUFFERRAM(this); - this->command(mtd, ONENAND_CMD_PROG, to, mtd->writesize); + ret = this->wait(mtd, FL_WRITING); - ret = this->wait(mtd, FL_WRITING); + /* In partial page write we don't update bufferram */ + onenand_update_bufferram(mtd, prev, !ret && !prev_subpage); + if (ONENAND_IS_2PLANE(this)) { + ONENAND_SET_BUFFERRAM1(this); + onenand_update_bufferram(mtd, prev + this->writesize, !ret && !prev_subpage); + } - /* In partial page write we don't update bufferram */ - onenand_update_bufferram(mtd, to, !ret && !subpage); - if (ONENAND_IS_2PLANE(this)) { - ONENAND_SET_BUFFERRAM1(this); - onenand_update_bufferram(mtd, to + this->writesize, !ret && !subpage); - } + if (ret) { + printk(KERN_ERR "onenand_write_ops_nolock: write filaed %d\n", ret); + break; + } - if (ret) { - printk(KERN_ERR "onenand_write_ops_nolock: write filaed %d\n", ret); - break; - } + if (written == len) { + /* Only check verify write turn on */ + ret = onenand_verify(mtd, buf - len, to - len, len); + if (ret) { + printk(KERN_ERR "onenand_write_ops_nolock: verify failed %d\n", ret); + break; + } + } + ONENAND_SET_NEXT_BUFFERRAM(this); - /* Only check verify write turn on */ - ret = onenand_verify(mtd, buf, to, thislen); - if (ret) { - printk(KERN_ERR "onenand_write_ops_nolock: verify failed %d\n", ret); - break; + if (written == len) + break; } - written += thislen; + this->command(mtd, ONENAND_CMD_PROG, to, mtd->writesize); - if (written == len) - break; + written += thislen; column = 0; + prev_subpage = subpage; + prev = to; + prevlen = thislen; to += thislen; buf += thislen; + first = 0; } ops->retlen = written;