TIMER_CURV_REG
timer_write_4(sc, TIMER_CURV_REG(0), sc->sc_period);
timer_write_4(sc, TIMER_CURV_REG(0), count);
val = timer_read_4(sc, TIMER_CURV_REG(0));
val = timer_read_4(sc, TIMER_CURV_REG(0));