INTC_ICR1
__raw_writew(0x0aaa, INTC_ICR1); // IRQ0-3=IRQ-mode,Low-active.
__raw_writew(__raw_readw(INTC_ICR1) | 0x000b, INTC_ICR1); /* ICR1 */
__raw_writel(0xAAAA0000, INTC_ICR1);
__raw_writew(0x2240, INTC_ICR1);
__raw_writew(__raw_readw(INTC_ICR1) & ~INTC_ICR1_IRQLVL, INTC_ICR1);