cue_csr_read_1
static uint8_t cue_csr_read_1(struct cue_softc *, uint16_t);
cue_csr_write_1(sc, reg, cue_csr_read_1(sc, reg) | (x))
cue_csr_write_1(sc, reg, cue_csr_read_1(sc, reg) & ~(x))