bwn_dma_base
static uint16_t bwn_dma_base(int, int);
base = bwn_dma_base(type, idx);
base = bwn_dma_base(0, 0);
dr->dr_base = bwn_dma_base(type, controller_index);
base = bwn_dma_base(0, 0);