LT_PPCnINT1EN
#define LT_IOPIRQINT1EN LT_PPCnINT1EN(3)
unsigned reg_en = irq < 32 ? LT_PPCnINT1EN(0) : LT_PPCnINT2EN(0);
unsigned reg_en = irq < 32 ? LT_PPCnINT1EN(0) : LT_PPCnINT2EN(0);
WR4(LT_PPCnINT1EN(0), 0);