JZ_ICMCR0
writereg(JZ_ICMCR0, 0x0c000000); /* TCU2, OST */
writereg(JZ_ICMCR0, 0x0c000000);
writereg(JZ_ICMCR0, ll);
writereg(JZ_ICMCR0, 1 << irq);