CTRL_SWDPIN
sc->sc_ctrl |= CTRL_SWDPIN(0);
sc->sc_ctrl &= ~CTRL_SWDPIN(0);
sc->sc_ctrl ^= (sc->sc_type >= WM_T_82540) ? CTRL_SWDPIN(0) : 0;
#define MDI_IO CTRL_SWDPIN(2)
#define MDI_CLK CTRL_SWDPIN(3)
sig = ctrl & CTRL_SWDPIN(1);
sc->sc_ctrl |= CTRL_SWDPIN(0) | CTRL_SWDPIN(1);
CSR_WRITE(sc, WMREG_CTRL, sc->sc_ctrl | CTRL_SWDPIN(2)
| CTRL_SWDPIN(3));