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mtd: nand: xway: extract read and write function 

Extract the functions to read and write to the register of the NAND
flash controller.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
This commit is contained in:
Hauke Mehrtens 2016-06-20 23:32:12 +02:00 committed by Boris Brezillon
parent e7e1f7be33
commit ddbed9c211
1 changed files with 19 additions and 9 deletions
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28
drivers/mtd/nand/xway_nand.c
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@ -68,6 +68,22 @@ struct xway_nand_data {
unsigned long csflags;
};
static u8 xway_readb(struct mtd_info *mtd, int op)
{
struct nand_chip *chip = mtd_to_nand(mtd);
void __iomem *nandaddr = chip->IO_ADDR_R;
return readb(nandaddr + op);
}
static void xway_writeb(struct mtd_info *mtd, int op, u8 value)
{
struct nand_chip *chip = mtd_to_nand(mtd);
void __iomem *nandaddr = chip->IO_ADDR_W;
writeb(value, nandaddr + op);
}
static void xway_select_chip(struct mtd_info *mtd, int select)
{
struct nand_chip *chip = mtd_to_nand(mtd);
@ -91,16 +107,13 @@ static void xway_select_chip(struct mtd_info *mtd, int select)
static void xway_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
{
struct nand_chip *this = mtd_to_nand(mtd);
unsigned long nandaddr = (unsigned long) this->IO_ADDR_W;
if (cmd == NAND_CMD_NONE)
return;
if (ctrl & NAND_CLE)
writeb(cmd, (void __iomem *) (nandaddr | NAND_WRITE_CMD));
xway_writeb(mtd, NAND_WRITE_CMD, cmd);
else if (ctrl & NAND_ALE)
writeb(cmd, (void __iomem *) (nandaddr | NAND_WRITE_ADDR));
xway_writeb(mtd, NAND_WRITE_ADDR, cmd);
while ((ltq_ebu_r32(EBU_NAND_WAIT) & NAND_WAIT_WR_C) == 0)
;
@ -113,10 +126,7 @@ static int xway_dev_ready(struct mtd_info *mtd)
static unsigned char xway_read_byte(struct mtd_info *mtd)
{
struct nand_chip *this = mtd_to_nand(mtd);
unsigned long nandaddr = (unsigned long) this->IO_ADDR_R;
return ltq_r8((void __iomem *)(nandaddr + NAND_READ_DATA));
return xway_readb(mtd, NAND_READ_DATA);
}
/*