AGE_DMA_CFG
CSR_WRITE_4(sc, AGE_DMA_CFG, CSR_READ_4(sc, AGE_DMA_CFG) |
CSR_WRITE_4(sc, AGE_DMA_CFG,
CSR_WRITE_4(sc, AGE_DMA_CFG,
CSR_READ_4(sc, AGE_DMA_CFG) & ~(DMA_CFG_RD_ENB | DMA_CFG_WR_ENB));
reg = CSR_READ_4(sc, AGE_DMA_CFG);
CSR_WRITE_4(sc, AGE_DMA_CFG, reg);
reg = CSR_READ_4(sc, AGE_DMA_CFG);
CSR_WRITE_4(sc, AGE_DMA_CFG, reg);