AT91: MACB support

The Atmel MACB Ethernet peripheral is also integrated in the AT91SAM9260
and AT91SAM9263 processors.  The differences from the AVR32 version are:
      * Single peripheral clock.
      * MII/RMII selection bit is inverted.
      * Clock enable bit.

Original patch from Patrice Vilchez.

Signed-off-by: Andrew Victor <andrew@sanpeople.com>
Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/net/macb.h b/drivers/net/macb.h
index 27bf0ae..b3bb218 100644
--- a/drivers/net/macb.h
+++ b/drivers/net/macb.h
@@ -200,7 +200,7 @@
 #define MACB_SOF_OFFSET				30
 #define MACB_SOF_SIZE				2
 
-/* Bitfields in USRIO */
+/* Bitfields in USRIO (AVR32) */
 #define MACB_MII_OFFSET				0
 #define MACB_MII_SIZE				1
 #define MACB_EAM_OFFSET				1
@@ -210,6 +210,12 @@
 #define MACB_TX_PAUSE_ZERO_OFFSET		3
 #define MACB_TX_PAUSE_ZERO_SIZE			1
 
+/* Bitfields in USRIO (AT91) */
+#define MACB_RMII_OFFSET			0
+#define MACB_RMII_SIZE				1
+#define MACB_CLKEN_OFFSET			1
+#define MACB_CLKEN_SIZE				1
+
 /* Bitfields in WOL */
 #define MACB_IP_OFFSET				0
 #define MACB_IP_SIZE				16