S_FIFO_TX_FLUSH_SHIFT
tmp = (BIT(S_FIFO_RX_FLUSH_SHIFT) | BIT(S_FIFO_TX_FLUSH_SHIFT));
val = (BIT(S_FIFO_RX_FLUSH_SHIFT) | BIT(S_FIFO_TX_FLUSH_SHIFT));
val |= (BIT(S_FIFO_TX_FLUSH_SHIFT));