PORT_PECR
__raw_writew(0x3C00, PORT_PECR); /* 00 11 11 00 00 00 00 00 */
__raw_writew(0x0002, PORT_PECR); /* PORT E 1 = IRQ5 */
__raw_writew(0x0000, PORT_PECR); /* PORT E 1 = IRQ5 ,E 0 = BS */