TX_CS
cs = nr64(TX_CS(rp->tx_channel));
rp->tx_cs = nr64(TX_CS(rp->tx_channel));
u64 val = nr64(TX_CS(channel));
u64 val = nr64(TX_CS(channel));
nw64(TX_CS(channel), val);
u64 val = nr64(TX_CS(channel));
u64 val = nr64(TX_CS(channel));
nw64(TX_CS(channel), val);
nw64(TX_CS(channel), 0);