I'm not exactly familiar with the file organization of QEMU but in the 0.11.0 source archive there's a folder called target-m68k that seems to hold the majority of the 68k code. There's also m68k-dis.c and m68k-semi.c in the archive root.
The hw folder contains dummy_m68k.c, mcf5206.c and mcf5208.c which seem to be related to Coldfire full system emulation.
Elbox used the MCF5475 on their Dragon card. In their
FAQ they stated that the MCF54xx line were the first Coldfire CPUs compatible enough for Amiga use.