REG_WDT_MAX_PRD_H
if (readw(priv->base + REG_WDT_MAX_PRD_L) | (readw(priv->base + REG_WDT_MAX_PRD_H) << 16))
writew((timeout >> 16) & 0xffff, priv->base + REG_WDT_MAX_PRD_H);
writew(0, priv->base + REG_WDT_MAX_PRD_H);