BT_CTRL
c = BT_READ(sc, BT_CTRL);
BT_WRITE(sc, BT_CTRL, c);
c = BT_READ(sc, BT_CTRL);
BT_WRITE(sc, BT_CTRL, c);
BT_WRITE(sc, BT_CTRL, BT_READ(sc, BT_CTRL) |
BT_WRITE(sc, BT_CTRL, 0xff << 24);
BT_BARRIER(sc, BT_CTRL, BUS_SPACE_BARRIER_WRITE);
BT_WRITE(sc, BT_CTRL, 0x00 << 24);
BT_BARRIER(sc, BT_CTRL, BUS_SPACE_BARRIER_WRITE);
BT_WRITE(sc, BT_CTRL,
BT_BARRIER(sc, BT_CTRL, BUS_SPACE_BARRIER_WRITE);
BT_WRITE(sc, BT_CTRL, 0x00 << 24);
BT_BARRIER(sc, BT_CTRL, BUS_SPACE_BARRIER_WRITE);
BT_WRITE(sc, BT_CTRL, 0xff);
BT_BARRIER(sc, BT_CTRL, BUS_SPACE_BARRIER_WRITE);
BT_WRITE(sc, BT_CTRL, 0x00);
BT_BARRIER(sc, BT_CTRL, BUS_SPACE_BARRIER_WRITE);
BT_WRITE(sc, BT_CTRL,
BT_BARRIER(sc, BT_CTRL, BUS_SPACE_BARRIER_WRITE);
BT_WRITE(sc, BT_CTRL, 0x00);
BT_BARRIER(sc, BT_CTRL, BUS_SPACE_BARRIER_WRITE);