EHCI_CAPLEN_HCIVERSION
offs = EHCI_CAPLENGTH(bus_read_4(res, EHCI_CAPLEN_HCIVERSION));
sc->sc_offs = EHCI_CAPLENGTH(EREAD4(sc, EHCI_CAPLEN_HCIVERSION));
version = EHCI_HCIVERSION(EREAD4(sc, EHCI_CAPLEN_HCIVERSION));