Bus from Kunming to Shangrila

I'll be arriving at Kunming from Chengdu by train and immediatly plan to go straight to Shangrila and there spend a day or two. After that i'll be spending a couple of days exploring around Lijang (Tiger Leaping Gorge) and Dali before heading back to Kunming and spend the next couple of days there. I cant seem to find any info on the busses to Shangrila though. Any help is appreciated :)