A Sphere Around a Tetrahedron

The four vertices of tetrahedron $P\text{-}ABC$ lie on a sphere $O$. We have $PA = PB = PC$, triangle $ABC$ is equilateral with side length $2$, and $E, F$ are the midpoints of $AC$ and $BC$ respectively, with $\angle EPF = 60^\circ$. Find the surface area of sphere $O$.