Mindfulness and the description of the objects of mindfulness (ie- Satipatthana) is a precursor to both samatha and vipassana states of mind. It falls into either camp simply by how the mindfulness is wielded. If the mindfulness is relatively unthinking and concentrated, focused on one object then it is more on the samatha side of the spectrum. However if it is more intelligent, more 'switched on', focused more on seeing characteristics of phenomena rather than the caught up with the content of phenomena in an unthinking way, then it is more towards the vipassana end of the spectrum.
I think the objects of satipatthana give rise to both- that is how Right Mindfulness can lead to Right concentration (which often defined as the four jhanas) as well as insight (Right widom of the arahanth).
This sutta gives us clues about the noble eightfold path givgin rise to samatha and vipasana.http://www.accesstoinsight.org/tipitaka ... .than.html