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[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>
This commit is contained in:
Matt Reimer 2007-10-18 17:43:07 -07:00 committed by David Woodhouse
parent 19e75ea72b
commit b773bb2e70
1 changed files with 14 additions and 0 deletions
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14
drivers/mtd/nand/s3c2410.c
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@ -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); 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) static void s3c2410_nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
{ {
struct nand_chip *this = mtd->priv; struct nand_chip *this = mtd->priv;
writesb(this->IO_ADDR_W, buf, len); 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 */ /* device management functions */
static int s3c2410_nand_remove(struct platform_device *pdev) 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; info->sel_bit = S3C2440_NFCONT_nFCE;
chip->cmd_ctrl = s3c2440_nand_hwcontrol; chip->cmd_ctrl = s3c2440_nand_hwcontrol;
chip->dev_ready = s3c2440_nand_devready; chip->dev_ready = s3c2440_nand_devready;
chip->read_buf = s3c2440_nand_read_buf;
chip->write_buf = s3c2440_nand_write_buf;
break; break;
case TYPE_S3C2412: case TYPE_S3C2412: