ltq_dma_open
extern void ltq_dma_open(struct ltq_dma_channel *ch);
EXPORT_SYMBOL_GPL(ltq_dma_open);
ltq_dma_open(&ch->dma);
ltq_dma_open(&priv->chan_tx.dma);
ltq_dma_open(&priv->chan_rx.dma);
ltq_dma_open(&ch_rx->dma);