FCR_ENABLE
#define FIFO_ENABLE FCR_ENABLE
if ((sc->fcr & FCR_ENABLE) ^ (value & FCR_ENABLE)) {
fifosz = (value & FCR_ENABLE) ?
if ((value & FCR_ENABLE) == 0) {
(FCR_ENABLE | FCR_DMA | FCR_RX_MASK);
iir = (sc->fcr & FCR_ENABLE) ? IIR_FIFO_MASK : 0;