[SPARC]: More abstractions and cleanups of dma handling in cs4231.

From: Georg Chini <georg.chini@triaton-webhosting.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/asm-sparc64/ebus.h

@@ -79,6 +79,7 @@ extern int ebus_dma_request(struct ebus_dma_info *p, dma_addr_t bus_addr,
 			    size_t len);
 extern void ebus_dma_prepare(struct ebus_dma_info *p, int write);
 extern unsigned int ebus_dma_residue(struct ebus_dma_info *p);
+extern unsigned int ebus_dma_addr(struct ebus_dma_info *p);
 extern void ebus_dma_enable(struct ebus_dma_info *p, int on);
 
 extern struct linux_ebus		*ebus_chain;