dm9000: add set_mac_address() v2

[michael trimarchi <trimarchi@gandalf.sssup.it>]

Implement set_mac_address() for the dm9000 driver.  This allows changing
the mac address of the interface. Fix BigEndian problem.
 
Signed-off-by: Michael Trimarchi <trimarchi@gandalf.sssup.it>
---

--- linux-2.6.22/drivers/net/dm9000.c.orig	2007-07-09 01:32:17.000000000 +0200
+++ linux-2.6.22/drivers/net/dm9000.c	2007-08-13 00:15:38.000000000 +0200
@@ -161,6 +161,8 @@ static irqreturn_t dm9000_interrupt(int,
 static int dm9000_phy_read(struct net_device *dev, int phyaddr_unsused, int reg);
 static void dm9000_phy_write(struct net_device *dev, int phyaddr_unused, int reg,
 			   int value);
+static int dm9000_eth_set_mac_address(struct net_device *dev, void *p);
+
 static u16 read_srom_word(board_info_t *, int);
 static void dm9000_rx(struct net_device *);
 static void dm9000_hash_table(struct net_device *);
@@ -546,6 +548,7 @@ dm9000_probe(struct platform_device *pde
 	ndev->stop		 = &dm9000_stop;
 	ndev->get_stats		 = &dm9000_get_stats;
 	ndev->set_multicast_list = &dm9000_hash_table;
+	ndev->set_mac_address	 = &dm9000_eth_set_mac_address;
 #ifdef CONFIG_NET_POLL_CONTROLLER
 	ndev->poll_controller	 = &dm9000_poll_controller;
 #endif
@@ -986,7 +989,6 @@ read_srom_word(board_info_t * db, int of
 	return (ior(db, DM9000_EPDRL) + (ior(db, DM9000_EPDRH) << 8));
 }
 
-#ifdef DM9000_PROGRAM_EEPROM
 /*
  * Write a word data to SROM
  */
@@ -1002,6 +1004,35 @@ write_srom_word(board_info_t * db, int o
 }
 
 /*
+ * dm9000_eth_set_mac_address
+ *
+ * Change the interface's mac address.
+ *
+ */
+static int 
+dm9000_eth_set_mac_address(struct net_device *dev, void *p)
+{
+	board_info_t *db = (board_info_t *) dev->priv;
+	struct sockaddr *addr = p;
+	int i;
+
+	if (!is_valid_ether_addr(addr->sa_data))
+		return -EADDRNOTAVAIL;
+
+	if (netif_running(dev))
+		return -EBUSY;
+
+	memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
+
+	for (i = 0; i < 3; i++)
+		write_srom_word(db, i,
+				cpu_to_le16(((u16 *) (addr->sa_data))[i]));
+
+	return 0;
+}
+
+#ifdef DM9000_PROGRAM_EEPROM
+/*
  * Only for development:
  * Here we write static data to the eeprom in case
  * we don't have valid content on a new board