RX_INTS
#define INT_MASK (RX_INTS | TX_INTS)
iowrite16(ioread16(ioaddr + MIER) | RX_INTS | TX_INTS,
if (status & (RX_INTS | TX_INTS)) {
misr &= ~(RX_INTS | TX_INTS);