dbdma_read_reg
while (dbdma_read_reg(chan, CHAN_STATUS_REG) & DBDMA_STATUS_ACTIVE)
status_reg = dbdma_read_reg(chan, CHAN_STATUS_REG);
chan->sc_saved_regs[0] = dbdma_read_reg(chan, CHAN_CMDPTR);
chan->sc_saved_regs[1] = dbdma_read_reg(chan, CHAN_CMDPTR_HI);
chan->sc_saved_regs[2] = dbdma_read_reg(chan, CHAN_INTR_SELECT);
chan->sc_saved_regs[3] = dbdma_read_reg(chan, CHAN_BRANCH_SELECT);
chan->sc_saved_regs[4] = dbdma_read_reg(chan, CHAN_WAIT_SELECT);
static uint32_t dbdma_read_reg(dbdma_channel_t *, u_int);