This is needed to give the MIPS Ingenic CI20 board a stable MAC address
which can be optionally provided by vendor U-Boot.

For get_mac_addr() we use an adapted copy of from ksz884x.c which
has very similar functionality.

Signed-off-by: H. Nikolaus Schaller <h...@goldelico.com>
---
 drivers/net/ethernet/davicom/dm9000.c | 42 +++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/drivers/net/ethernet/davicom/dm9000.c 
b/drivers/net/ethernet/davicom/dm9000.c
index 1ea3372775e6..7402030b0352 100644
--- a/drivers/net/ethernet/davicom/dm9000.c
+++ b/drivers/net/ethernet/davicom/dm9000.c
@@ -1409,6 +1409,43 @@ static struct dm9000_plat_data *dm9000_parse_dt(struct 
device *dev)
        return pdata;
 }
 
+static char *mac_addr = ":";
+module_param(mac_addr, charp, 0);
+MODULE_PARM_DESC(mac_addr, "MAC address");
+
+static void get_mac_addr(struct net_device *ndev, char *macaddr)
+{
+       int i = 0;
+       int j = 0;
+       int got_num = 0;
+       int num = 0;
+
+       while (j < ETH_ALEN) {
+               if (macaddr[i]) {
+                       int digit;
+
+                       got_num = 1;
+                       digit = hex_to_bin(macaddr[i]);
+                       if (digit >= 0)
+                               num = num * 16 + digit;
+                       else if (':' == macaddr[i])
+                               got_num = 2;
+                       else
+                               break;
+               } else if (got_num) {
+                       got_num = 2;
+               } else {
+                       break;
+               }
+               if (got_num == 2) {
+                       ndev->dev_addr[j++] = (u8)num;
+                       num = 0;
+                       got_num = 0;
+               }
+               i++;
+       }
+}
+
 /*
  * Search DM9000 board, allocate space and register it
  */
@@ -1679,6 +1716,11 @@ dm9000_probe(struct platform_device *pdev)
                        ndev->dev_addr[i] = ior(db, i+DM9000_PAR);
        }
 
+       if (!is_valid_ether_addr(ndev->dev_addr)) {
+               mac_src = "param";
+               get_mac_addr(ndev, mac_addr);
+       }
+
        if (!is_valid_ether_addr(ndev->dev_addr)) {
                inv_mac_addr = true;
                eth_hw_addr_random(ndev);
-- 
2.23.0

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