diff options
| author | Matt Reimer <mreimer@vpop.net> | 2007-10-18 17:43:07 -0700 |
|---|---|---|
| committer | David Woodhouse <dwmw2@infradead.org> | 2007-10-20 14:54:26 +0100 |
| commit | b773bb2e702f6ac96223018d621ea9ed0d4f23ff (patch) | |
| tree | 7e37ddbbc05889042ff7ee3df12cc784bc56b9fd | |
| parent | 19e75ea72b21136805218a2f55177e99100d62e5 (diff) | |
| download | op-kernel-dev-b773bb2e702f6ac96223018d621ea9ed0d4f23ff.zip op-kernel-dev-b773bb2e702f6ac96223018d621ea9ed0d4f23ff.tar.gz | |
[MTD] [NAND] add s3c2440-specific read_buf/write_buf
Add read_buf/write_buf for s3c2440, which can read/write 32 bits at a
time rather than just 8. In my testing on an s3c2440a running at 400 MHz
with a 100 MHz HCLK, read performance improves by 36% (from 5.19 MB/s
to 7.07 MB/s).
Signed-off-by: Matt Reimer <mreimer@vpop.net>
Acked-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
| -rw-r--r-- | drivers/mtd/nand/s3c2410.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/mtd/nand/s3c2410.c b/drivers/mtd/nand/s3c2410.c index 21b921d..66f76e9 100644 --- a/drivers/mtd/nand/s3c2410.c +++ b/drivers/mtd/nand/s3c2410.c @@ -488,12 +488,24 @@ static void s3c2410_nand_read_buf(struct mtd_info *mtd, u_char *buf, int len) readsb(this->IO_ADDR_R, buf, len); } +static void s3c2440_nand_read_buf(struct mtd_info *mtd, u_char *buf, int len) +{ + struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd); + readsl(info->regs + S3C2440_NFDATA, buf, len / 4); +} + static void s3c2410_nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len) { struct nand_chip *this = mtd->priv; writesb(this->IO_ADDR_W, buf, len); } +static void s3c2440_nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len) +{ + struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd); + writesl(info->regs + S3C2440_NFDATA, buf, len / 4); +} + /* device management functions */ static int s3c2410_nand_remove(struct platform_device *pdev) @@ -604,6 +616,8 @@ static void s3c2410_nand_init_chip(struct s3c2410_nand_info *info, info->sel_bit = S3C2440_NFCONT_nFCE; chip->cmd_ctrl = s3c2440_nand_hwcontrol; chip->dev_ready = s3c2440_nand_devready; + chip->read_buf = s3c2440_nand_read_buf; + chip->write_buf = s3c2440_nand_write_buf; break; case TYPE_S3C2412: |
