DMA_CONTROL_REG
lp->dma_out(lp, DMA_CONTROL_REG, DMA_CONTROL_RST);
lp->dma_out(lp, DMA_CONTROL_REG, DMA_CONTROL_RST);
while (lp->dma_in(lp, DMA_CONTROL_REG) & DMA_CONTROL_RST) {
lp->dma_out(lp, DMA_CONTROL_REG, DMA_TAIL_ENABLE);