S3C2410_IICCON_ACKEN
writel(tmp & ~S3C2410_IICCON_ACKEN, i2c->regs + S3C2410_IICCON);
writel(tmp | S3C2410_IICCON_ACKEN, i2c->regs + S3C2410_IICCON);
if (!(tmp & S3C2410_IICCON_ACKEN)) {
S3C2410_IICCON_ACKEN);