XLLF_ISR_OFFSET
iowrite32(XLLF_INT_CLEAR_ALL, fifo->base_addr + XLLF_ISR_OFFSET);
isr = ioread32(fifo->base_addr + XLLF_ISR_OFFSET);
iowrite32(XLLF_INT_CLEAR_ALL, fifo->base_addr + XLLF_ISR_OFFSET);
{"isr", XLLF_ISR_OFFSET},