DIAG_UL
if (read_iir & DIAG_UL) {
dc->last_ier &= ~DIAG_UL;
writew(DIAG_UL, dc->reg_fcr);
dc->last_ier = dc->last_ier | DIAG_UL;
static const u16 mask[] = {MDM_UL, DIAG_UL, APP1_UL, APP2_UL, CTRL_UL};
{~MDM_UL, ~DIAG_UL, ~APP1_UL, ~APP2_UL, ~CTRL_UL};
if (interrupt & DIAG_UL)