There are a lot of ways to play this one, but this is the easiest IMO.

Tuning:
D-A-D-F#-A-d

Capo 6th fret

d | --------------------------------------------------0------- |
A | ------------------------0-------------0-------2h4---4p2p0- |
F#| ----------0---------0h2---2---------2--------------------- |
D | --------2---------2---------------4----------------------- | repeat
A | --0----------(0)------------------------------------------ |
D | --0---0-------2---------------4--------------------------- |