HWP_PCAC
bus_write_4(sc->sc_mem, HWP_PCAC, HWP_PCAC_PSTOP);
(bus_read_4(sc->sc_mem, HWP_PCAC) & HWP_HXS_PCAC_PSTAT) != 0; i++) {
bus_write_4(sc->sc_mem, HWP_PCAC, 0);