Implement USB DMA Function on Samsung2443 CPU

 I have tried to implement USB DMA function on Samsung 2443 CPU, As I
know,Samsung 2443 DMA controller don't have USB DMA sources, But the USB core does
support DMA transfer,I got this information in Samsung 2443 CPU Spec,but
Samsung didn't implement this USB DMA function in their Sample BSP,Is there
any  friends know how to realize it? Thanks!