CPSW_CPDMA_TX_CP
tx0_cp = cpsw_read_4(sc, CPSW_CPDMA_TX_CP(0));
cpsw_write_4(sc, CPSW_CPDMA_TX_CP(0), 0xfffffffc);
tx0_cp = cpsw_read_4(sc, CPSW_CPDMA_TX_CP(0));
cpsw_write_4(sc, CPSW_CPDMA_TX_CP(0),
cpsw_read_4(sc, CPSW_CPDMA_TX_CP(0)),
stat = cpsw_read_4(sc, CPSW_CPDMA_TX_CP(0));
cpsw_read_4(sc, CPSW_CPDMA_TX_CP(0)),
cpsw_write_4(sc, CPSW_CPDMA_TX_CP(i), 0);