sunxi: Add support for multiple ethadrr-esses

Currently we fill ethaddr with a fixed unique address based on the SoCs
serial (from the sid) to make sure that boards which use the integrated
emac / gmac get a fixed mac rather then a random one.

On some boards the wifi does not come with a fixed mac either, so we need
to also set eth1addr.

This commit changes the ethaddr setting code to check for ethernet%d
aliases (as fdt_fixup_ethernet does) and set an ethaddr variable for
all present aliases.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>

board/sunxi/board.c

@@ -26,6 +26,7 @@
 #endif
 #include <asm/gpio.h>
 #include <asm/io.h>
+#include <libfdt.h>
 #include <nand.h>
 #include <net.h>
 #include <sy8106a.h>
@@ -609,36 +610,42 @@ static void parse_spl_header(const uint32_t spl_addr)
 }
 #endif
 
-#ifdef CONFIG_MISC_INIT_R
-int misc_init_r(void)
+/*
+ * Note this function gets called multiple times.
+ * It must not make any changes to env variables which already exist.
+ */
+static void setup_environment(const void *fdt)
 {
 	char serial_string[17] = { 0 };
 	unsigned int sid[4];
 	uint8_t mac_addr[6];
-	int ret;
-
-#if !defined(CONFIG_SPL_BUILD)
-	setenv("fel_booted", NULL);
-	setenv("fel_scriptaddr", NULL);
-	/* determine if we are running in FEL mode */
-	if (!is_boot0_magic(SPL_ADDR + 4)) { /* eGON.BT0 */
-		setenv("fel_booted", "1");
-		parse_spl_header(SPL_ADDR);
-	}
-#endif
+	char ethaddr[16];
+	int i, ret;
 
 	ret = sunxi_get_sid(sid);
 	if (ret == 0 && sid[0] != 0 && sid[3] != 0) {
-		if (!getenv("ethaddr")) {
+		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 (getenv(ethaddr))
+				continue;
+
 			/* Non OUI / registered MAC address */
-			mac_addr[0] = 0x02;
+			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_setenv_enetaddr("ethaddr", mac_addr);
+			eth_setenv_enetaddr(ethaddr, mac_addr);
 		}
 
 		if (!getenv("serial#")) {
@@ -648,6 +655,24 @@ int misc_init_r(void)
 			setenv("serial#", serial_string);
 		}
 	}
+}
+
+#ifdef CONFIG_MISC_INIT_R
+int misc_init_r(void)
+{
+	__maybe_unused int ret;
+
+#if !defined(CONFIG_SPL_BUILD)
+	setenv("fel_booted", NULL);
+	setenv("fel_scriptaddr", NULL);
+	/* determine if we are running in FEL mode */
+	if (!is_boot0_magic(SPL_ADDR + 4)) { /* eGON.BT0 */
+		setenv("fel_booted", "1");
+		parse_spl_header(SPL_ADDR);
+	}
+#endif
+
+	setup_environment(gd->fdt_blob);
 
 #ifndef CONFIG_MACH_SUN9I
 	ret = sunxi_usb_phy_probe();
@@ -664,6 +689,12 @@ int ft_board_setup(void *blob, bd_t *bd)
 {
 	int __maybe_unused r;
 
+	/*
+	 * Call setup_environment again in case the boot fdt has
+	 * ethernet aliases the u-boot copy does not have.
+	 */
+	setup_environment(blob);
+
 #ifdef CONFIG_VIDEO_DT_SIMPLEFB
 	r = sunxi_simplefb_setup(blob);
 	if (r)