net/macb: support reversed hw addr

This is used on one AT91RM9200 board where a bootloader stores
the Ethernet address in the wrong order.

Support this on macb so address setting functions can be shared
with the at91_ether driver.

Signed-off-by: Joachim Eastwood <manabian@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 18 insertions, 6 deletions

diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c
index 3b609bed70bc..a9e5a50ffc35 100644
--- a/drivers/net/ethernet/cadence/macb.c
+++ b/drivers/net/ethernet/cadence/macb.c
@@ -111,22 +111,34 @@ static void __macb_set_hwaddr(struct macb *bp)
 
 static void __init macb_get_hwaddr(struct macb *bp)
 {
+        struct macb_platform_data *pdata;
         u32 bottom;
         u16 top;
         u8 addr[6];
         int i;
 
+        pdata = bp->pdev->dev.platform_data;
+
         /* Check all 4 address register for vaild address */
         for (i = 0; i < 4; i++) {
                 bottom = macb_or_gem_readl(bp, SA1B + i * 8);
                 top = macb_or_gem_readl(bp, SA1T + i * 8);
 
-                addr[0] = bottom & 0xff;
-                addr[1] = (bottom >> 8) & 0xff;
-                addr[2] = (bottom >> 16) & 0xff;
-                addr[3] = (bottom >> 24) & 0xff;
-                addr[4] = top & 0xff;
-                addr[5] = (top >> 8) & 0xff;
+                if (pdata && pdata->rev_eth_addr) {
+                        addr[5] = bottom & 0xff;
+                        addr[4] = (bottom >> 8) & 0xff;
+                        addr[3] = (bottom >> 16) & 0xff;
+                        addr[2] = (bottom >> 24) & 0xff;
+                        addr[1] = top & 0xff;
+                        addr[0] = (top & 0xff00) >> 8;
+                } else {
+                        addr[0] = bottom & 0xff;
+                        addr[1] = (bottom >> 8) & 0xff;
+                        addr[2] = (bottom >> 16) & 0xff;
+                        addr[3] = (bottom >> 24) & 0xff;
+                        addr[4] = top & 0xff;
+                        addr[5] = (top >> 8) & 0xff;
+                }
 
                 if (is_valid_ether_addr(addr)) {
                         memcpy(bp->dev->dev_addr, addr, sizeof(addr));