Weigth distribution of cyclic codes of length mp^s

Let F_q be a field with q elements such that gcd(mp, q(q-1))= 1 and q² ≡ 1(mod mp^s), where m is prime and p> ^m is prime. In this paper, we give all primitive idempotents in a ring . We give the weight distributions of all irreducible cyclic codes of length mp^s over F_q.