We own a farm with a house, dont live in the home&claim residency in another state. Do I need to allocate the mortgage int. btn our sch F and personal deductions?How?

I cannot find how to allocate the interest paid on a mortgage between personal and farm use. Or if I even need to do it. It is not our main house, because we claim residency in another state. Can I claim all the interest on the schedule F or do I need to separate? Is there a rule for separating the interest if so?