ppbus_dma_free
ppbus_dma_free(parent, &(sc->sc_inbuf),
ppbus_dma_free(device_parent(self), &(lpt->sc_inbuf),
ppbus_dma_free(device_parent(self), &(lpt->sc_outbuf),
ppbus->ppbus_dma_free(device_parent(dev), buf, addr, size);
int ppbus_dma_free(device_t, void **, bus_addr_t *, bus_size_t);
ppbus->ppbus_dma_free = sc_link->parport_dma_free;
PARPORT_DMA_FREE_T ppbus_dma_free;