MDM_UL2
if (read_iir & MDM_UL2) {
writew(MDM_UL2, dc->reg_fcr);
} else if (*toggle == 1 && read_iir & MDM_UL2) {
writew(MDM_UL2, dc->reg_fcr);
#define MDM_UL (MDM_UL1 | MDM_UL2)
if (interrupt & MDM_UL2)