athn_clock_rate
int athn_clock_rate(struct athn_softc *);
(athn_clock_rate(sc) * 1000);
AR_WRITE(sc, AR_D_GBL_IFS_SIFS, (sifs - 2) * athn_clock_rate(sc));
reg = RW(reg, AR_TIME_OUT_ACK, ackto * athn_clock_rate(sc));
reg = RW(reg, AR_TIME_OUT_CTS, ctsto * athn_clock_rate(sc));
int clockrate = athn_clock_rate(sc);
AR_WRITE(sc, AR_D_GBL_IFS_SLOT, slot * athn_clock_rate(sc));