CPSW_WR_INT_CONTROL
ctrl = cpsw_read_4(sc, CPSW_WR_INT_CONTROL);
cpsw_write_4(sc, CPSW_WR_INT_CONTROL, ctrl);
cpsw_write_4(sc, CPSW_WR_INT_CONTROL, ctrl);
reg = cpsw_read_4(sc, CPSW_WR_INT_CONTROL);
cpsw_write_4(sc, CPSW_WR_INT_CONTROL, reg);