CTRL_SWDPIO
#define MDI_DIR CTRL_SWDPIO(2) /* host -> PHY */
v |= MDI_DIR | CTRL_SWDPIO(3);
v |= CTRL_SWDPIO(3);
sc->sc_ctrl |= CTRL_SWDPIO(0);
sc->sc_ctrl &= ~CTRL_SWDPIO(1);