net: Provide a function to get the current MAC address

The current implementation exposes the eth_device struct to code that
needs to access the MAC address.  Add a wrapper function for this to
abstract away the pointer for this operation.
Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

arch/mips/mach-au1x00/au1x00_eth.c

@@ -238,7 +238,7 @@ static int au1x00_init(struct eth_device* dev, bd_t * bd){
 	}
 
 	/* Put mac addr in little endian */
-#define ea eth_get_dev()->enetaddr
+#define ea eth_get_ethaddr()
 	*mac_addr_high	=	(ea[5] <<  8) | (ea[4]	    ) ;
 	*mac_addr_low	=	(ea[3] << 24) | (ea[2] << 16) |
 		(ea[1] <<  8) | (ea[0]	    ) ;

arch/powerpc/cpu/mpc8260/ether_fcc.c

@@ -299,7 +299,7 @@ static int fec_init(struct eth_device* dev, bd_t *bis)
      * it unique by setting a few bits in the upper byte of the
      * non-static part of the address.
      */
-#define ea eth_get_dev()->enetaddr
+#define ea eth_get_ethaddr()
     pram_ptr->fen_paddrh = (ea[5] << 8) + ea[4];
     pram_ptr->fen_paddrm = (ea[3] << 8) + ea[2];
     pram_ptr->fen_paddrl = (ea[1] << 8) + ea[0];

arch/powerpc/cpu/mpc85xx/ether_fcc.c

@@ -338,7 +338,7 @@ static int fec_init(struct eth_device* dev, bd_t *bis)
      * it unique by setting a few bits in the upper byte of the
      * non-static part of the address.
      */
-#define ea eth_get_dev()->enetaddr
+#define ea eth_get_ethaddr()
     pram_ptr->fen_paddrh = (ea[5] << 8) + ea[4];
     pram_ptr->fen_paddrm = (ea[3] << 8) + ea[2];
     pram_ptr->fen_paddrl = (ea[1] << 8) + ea[0];

arch/powerpc/cpu/mpc8xx/scc.c

@@ -339,7 +339,7 @@ static int scc_init (struct eth_device *dev, bd_t * bis)
 	pram_ptr->sen_gaddr3 = 0x0;	/* Group Address Filter 3 (unused) */
 	pram_ptr->sen_gaddr4 = 0x0;	/* Group Address Filter 4 (unused) */
 
-#define ea eth_get_dev()->enetaddr
+#define ea eth_get_ethaddr()
 	pram_ptr->sen_paddrh = (ea[5] << 8) + ea[4];
 	pram_ptr->sen_paddrm = (ea[3] << 8) + ea[2];
 	pram_ptr->sen_paddrl = (ea[1] << 8) + ea[0];

include/net.h

@@ -111,6 +111,14 @@ struct eth_device *eth_get_dev(void)
 {
 	return eth_current;
 }
+
+static inline unsigned char *eth_get_ethaddr(void)
+{
+	if (eth_current)
+		return eth_current->enetaddr;
+	return NULL;
+}
+
 extern struct eth_device *eth_get_dev_by_name(const char *devname);
 extern struct eth_device *eth_get_dev_by_index(int index); /* get dev @ index */
 extern int eth_get_dev_index(void);		/* get the device index */

net/net.c

@@ -275,7 +275,7 @@ static void NetInitLoop(void)
 		env_changed_id = env_id;
 	}
 	if (eth_get_dev())
-		memcpy(NetOurEther, eth_get_dev()->enetaddr, 6);
+		memcpy(NetOurEther, eth_get_ethaddr(), 6);
 
 	return;
 }