pasemi_dma_alloc_chan
extern void *pasemi_dma_alloc_chan(enum pasemi_dmachan_type type,
EXPORT_SYMBOL(pasemi_dma_alloc_chan);
ring = pasemi_dma_alloc_chan(TXCHAN, sizeof(struct pasemi_mac_csring),
ring = pasemi_dma_alloc_chan(RXCHAN, sizeof(struct pasemi_mac_rxring),
ring = pasemi_dma_alloc_chan(TXCHAN, sizeof(struct pasemi_mac_txring),