From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.nokia.com ([147.243.1.48] helo=mgw-sa02.nokia.com) by canuck.infradead.org with esmtps (Exim 4.72 #1 (Red Hat Linux)) id 1PDb0S-0000dB-AE for linux-mtd@lists.infradead.org; Wed, 03 Nov 2010 10:55:54 +0000 From: Roman Tereshonkov To: linux-mtd@lists.infradead.org Subject: [PATCHv2 3/3] mtd: onenand: implement cache program feature for 4kb page onenand Date: Wed, 3 Nov 2010 12:55:21 +0200 Message-Id: <1288781721-31771-4-git-send-email-roman.tereshonkov@nokia.com> In-Reply-To: <1288781721-31771-1-git-send-email-roman.tereshonkov@nokia.com> References: <1288781721-31771-1-git-send-email-roman.tereshonkov@nokia.com> Cc: kyungmin.park@samsung.com, Roman Tereshonkov List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Implement cache program feature for 4KB page onenand. This feature improves the write data performance. The observed 128KB data program speed change is from 8827KB/s to 14156 KB/s when the feature is enabled. Signed-off-by: Roman Tereshonkov --- drivers/mtd/onenand/onenand_base.c | 22 +++++++++++++++++++--- 1 files changed, 19 insertions(+), 3 deletions(-) diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c index 6b3a875..4d6e6c5 100644 --- a/drivers/mtd/onenand/onenand_base.c +++ b/drivers/mtd/onenand/onenand_base.c @@ -1845,7 +1845,7 @@ static int onenand_write_ops_nolock(struct mtd_info *mtd, loff_t to, const u_char *buf = ops->datbuf; const u_char *oob = ops->oobbuf; u_char *oobbuf; - int ret = 0; + int ret = 0, cmd; DEBUG(MTD_DEBUG_LEVEL3, "%s: to = 0x%08x, len = %i\n", __func__, (unsigned int) to, (int) len); @@ -1954,7 +1954,19 @@ static int onenand_write_ops_nolock(struct mtd_info *mtd, loff_t to, ONENAND_SET_NEXT_BUFFERRAM(this); } - this->command(mtd, ONENAND_CMD_PROG, to, mtd->writesize); + this->ongoing = 0; + cmd = ONENAND_CMD_PROG; + + /* Exclude 1st OTP and OTP blocks for cache program feature */ + if (ONENAND_IS_CACHE_PROGRAM(this) && + likely(onenand_block(this, to) != 0) && + ONENAND_IS_4KB_PAGE(this) && + ((written + thislen) < len)) { + cmd = ONENAND_CMD_2X_CACHE_PROG; + this->ongoing = 1; + } + + this->command(mtd, cmd, to, mtd->writesize); /* * 2 PLANE, MLC, and Flex-OneNAND wait here @@ -3377,8 +3389,10 @@ static void onenand_check_features(struct mtd_info *mtd) case ONENAND_DEVICE_DENSITY_4Gb: if (ONENAND_IS_DDP(this)) this->options |= ONENAND_HAS_2PLANE; - else if (numbufs == 1) + else if (numbufs == 1) { this->options |= ONENAND_HAS_4KB_PAGE; + this->options |= ONENAND_HAS_CACHE_PROGRAM; + } case ONENAND_DEVICE_DENSITY_2Gb: /* 2Gb DDP does not have 2 plane */ @@ -3415,6 +3429,8 @@ static void onenand_check_features(struct mtd_info *mtd) printk(KERN_DEBUG "Chip has 2 plane\n"); if (this->options & ONENAND_HAS_4KB_PAGE) printk(KERN_DEBUG "Chip has 4KiB pagesize\n"); + if (this->options & ONENAND_HAS_CACHE_PROGRAM) + printk(KERN_DEBUG "Chip has cache program feature\n"); } /** -- 1.7.0.4