TIMBDMA_ISR
isr = ioread32(td->membase + TIMBDMA_ISR) & (1 << id);
iowrite32(isr, td->membase + TIMBDMA_ISR);
isr = ioread32(td->membase + TIMBDMA_ISR);
iowrite32(ipr, td->membase + TIMBDMA_ISR);
iowrite32(0xFFFFFFFF, td->membase + TIMBDMA_ISR);