sunxi: board: extract creating a unique sid into a helper function

Refactor setup_environment() so we can use the created sid for a
Bluetooth address too.

Signed-off-by: Andre Heider <a.heider@gmail.com>
Acked-by: Maxime Ripard <mripard@kernel.org>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
[rebased]
Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>

diff --git a/board/sunxi/board.c b/board/sunxi/board.c
index 77e4647..b7f527a 100644 (file)
--- a/board/sunxi/board.c
+++ b/board/sunxi/board.c
@@ -789,6 +789,38 @@ static void parse_spl_header(const uint32_t spl_addr)
        env_set_hex("fel_scriptaddr", spl->fel_script_address);
 }
 
+static bool get_unique_sid(unsigned int *sid)
+{
+       if (sunxi_get_sid(sid) != 0)
+               return false;
+
+       if (!sid[0])
+               return false;
+
+       /*
+        * The single words 1 - 3 of the SID have quite a few bits
+        * which are the same on many models, so we take a crc32
+        * of all 3 words, to get a more unique value.
+        *
+        * Note we only do this on newer SoCs as we cannot change
+        * the algorithm on older SoCs since those have been using
+        * fixed mac-addresses based on only using word 3 for a
+        * long time and changing a fixed mac-address with an
+        * u-boot update is not good.
+        */
+#if !defined(CONFIG_MACH_SUN4I) && !defined(CONFIG_MACH_SUN5I) && \
+    !defined(CONFIG_MACH_SUN6I) && !defined(CONFIG_MACH_SUN7I) && \
+    !defined(CONFIG_MACH_SUN8I_A23) && !defined(CONFIG_MACH_SUN8I_A33)
+       sid[3] = crc32(0, (unsigned char *)&sid[1], 12);
+#endif
+
+       /* Ensure the NIC specific bytes of the mac are not all 0 */
+       if ((sid[3] & 0xffffff) == 0)
+               sid[3] |= 0x800000;
+
+       return true;
+}
+
 /*
  * Note this function gets called multiple times.
  * It must not make any changes to env variables which already exist.
@@ -799,61 +831,40 @@ static void setup_environment(const void *fdt)
        unsigned int sid[4];
        uint8_t mac_addr[6];
        char ethaddr[16];
-       int i, ret;
+       int i;
 
-       ret = sunxi_get_sid(sid);
-       if (ret == 0 && sid[0] != 0) {
-               /*
-                * The single words 1 - 3 of the SID have quite a few bits
-                * which are the same on many models, so we take a crc32
-                * of all 3 words, to get a more unique value.
-                *
-                * Note we only do this on newer SoCs as we cannot change
-                * the algorithm on older SoCs since those have been using
-                * fixed mac-addresses based on only using word 3 for a
-                * long time and changing a fixed mac-address with an
-                * u-boot update is not good.
-                */
-#if !defined(CONFIG_MACH_SUN4I) && !defined(CONFIG_MACH_SUN5I) && \
-    !defined(CONFIG_MACH_SUN6I) && !defined(CONFIG_MACH_SUN7I) && \
-    !defined(CONFIG_MACH_SUN8I_A23) && !defined(CONFIG_MACH_SUN8I_A33)
-               sid[3] = crc32(0, (unsigned char *)&sid[1], 12);
-#endif
-
-               /* Ensure the NIC specific bytes of the mac are not all 0 */
-               if ((sid[3] & 0xffffff) == 0)
-                       sid[3] |= 0x800000;
+       if (!get_unique_sid(sid))
+               return;
 
-               for (i = 0; i < 4; i++) {
-                       sprintf(ethaddr, "ethernet%d", i);
-                       if (!fdt_get_alias(fdt, ethaddr))
-                               continue;
+       for (i = 0; i < 4; i++) {
+               sprintf(ethaddr, "ethernet%d", i);
+               if (!fdt_get_alias(fdt, ethaddr))
+                       continue;
 
-                       if (i == 0)
-                               strcpy(ethaddr, "ethaddr");
-                       else
-                               sprintf(ethaddr, "eth%daddr", i);
+               if (i == 0)
+                       strcpy(ethaddr, "ethaddr");
+               else
+                       sprintf(ethaddr, "eth%daddr", i);
 
-                       if (env_get(ethaddr))
-                               continue;
+               if (env_get(ethaddr))
+                       continue;
 
-                       /* Non OUI / registered MAC address */
-                       mac_addr[0] = (i << 4) | 0x02;
-                       mac_addr[1] = (sid[0] >>  0) & 0xff;
-                       mac_addr[2] = (sid[3] >> 24) & 0xff;
-                       mac_addr[3] = (sid[3] >> 16) & 0xff;
-                       mac_addr[4] = (sid[3] >>  8) & 0xff;
-                       mac_addr[5] = (sid[3] >>  0) & 0xff;
+               /* Non OUI / registered MAC address */
+               mac_addr[0] = (i << 4) | 0x02;
+               mac_addr[1] = (sid[0] >>  0) & 0xff;
+               mac_addr[2] = (sid[3] >> 24) & 0xff;
+               mac_addr[3] = (sid[3] >> 16) & 0xff;
+               mac_addr[4] = (sid[3] >>  8) & 0xff;
+               mac_addr[5] = (sid[3] >>  0) & 0xff;
 
-                       eth_env_set_enetaddr(ethaddr, mac_addr);
-               }
+               eth_env_set_enetaddr(ethaddr, mac_addr);
+       }
 
-               if (!env_get("serial#")) {
-                       snprintf(serial_string, sizeof(serial_string),
-                               "%08x%08x", sid[0], sid[3]);
+       if (!env_get("serial#")) {
+               snprintf(serial_string, sizeof(serial_string),
+                       "%08x%08x", sid[0], sid[3]);
 
-                       env_set("serial#", serial_string);
-               }
+               env_set("serial#", serial_string);
        }
 }