ARCMSR_DOORBELL_INT_CLEAR_PATTERN
WRITE_CHIP_REG32(0, phbbmu->iop2drv_doorbell, ARCMSR_DOORBELL_INT_CLEAR_PATTERN); /* clear doorbell interrupt */
WRITE_CHIP_REG32(0, phbbmu->iop2drv_doorbell, ARCMSR_DOORBELL_INT_CLEAR_PATTERN);/*clear interrupt and message state*/
WRITE_CHIP_REG32(0, phbbmu->iop2drv_doorbell, ARCMSR_DOORBELL_INT_CLEAR_PATTERN); /* clear doorbell interrupt */