IC_FALLINGCLR
__raw_writel(1 << bit, base + IC_FALLINGCLR);
__raw_writel(1 << bit, base + IC_FALLINGCLR);
__raw_writel(1 << bit, base + IC_FALLINGCLR);
__raw_writel(1 << bit, base + IC_FALLINGCLR);
__raw_writel(0xffffffff, base + IC_FALLINGCLR);