S_FIFO_CTRL_OFFSET
iproc_i2c_wr_reg(iproc_i2c, S_FIFO_CTRL_OFFSET, tmp);
iproc_i2c_wr_reg(iproc_i2c, S_FIFO_CTRL_OFFSET, val);
val = iproc_i2c_rd_reg(iproc_i2c, S_FIFO_CTRL_OFFSET);
iproc_i2c_wr_reg(iproc_i2c, S_FIFO_CTRL_OFFSET, val);