epic_mii_wait
if ((rv = epic_mii_wait(sc, MMCTL_WRITE)) != 0)
if ((rv = epic_mii_wait(sc, MMCTL_READ)) != 0)
if ((rv = epic_mii_wait(sc, MMCTL_WRITE)) != 0)
static int epic_mii_wait(struct epic_softc *, uint32_t);