OCTEON_REG_BLOCK_FIFO
__be64 rd = cpu_to_be64(__raw_readq(i2c->twsi_base + OCTEON_REG_BLOCK_FIFO(i2c)));
octeon_i2c_writeq_flush((u64)buf, i2c->twsi_base + OCTEON_REG_BLOCK_FIFO(i2c));