The 26-year-old joined the Catalan outfit from Arsenal in 2012, but has struggled to force his way into Barca's starting midfield.
"Now I am happy in Barcelona. I still have years on my contract but I do not know what will happen in the future," Song told BBC Sport.
"I play in one of the best leagues in the world, everyone treats me very well, there are some of the best players here and I really enjoy working with them.
"Tata Martino? He is a different coach. He did very well in Argentina last season and now we are doing well. We must follow the path that he marks out."
Song has been linked with a January departure.