RWTCSRA_TME
rwdt_write(priv, priv->cks | RWTCSRA_TME, RWTCSRA);
val = readb_relaxed(priv->base + RWTCSRA) & ~RWTCSRA_TME;
rwdt_write(priv, RWTCSRA_TME, RWTCSRA);
if (csra & RWTCSRA_TME) {
val = readb_relaxed(priv->base + RWTCSRA) & ~RWTCSRA_TME;