mtd: onenand: implement cache program feature for 4KiB page onenand
Implement cache program feature for 4KiB page onenand.
This feature improves the write data performance.
The observed 128KiB data program speed change is
from 8827KiB/s to 14156 KiB/s when the feature is enabled.
Signed-off-by: Roman Tereshonkov <roman.tereshonkov@nokia.com>
Acked-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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 @@
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 @@
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 @@
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 @@
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");
}
/**