DMA_CHAN_RST
ltq_dma_w32_mask(0, DMA_CHAN_RST, LTQ_DMA_CCTRL);
while (ltq_dma_r32(LTQ_DMA_CCTRL) & DMA_CHAN_RST)
ltq_dma_w32(DMA_CHAN_RST, LTQ_DMA_CCTRL);
c->rst = DMA_CHAN_RST;
c->rst = DMA_CHAN_RST;