sunxi: use random parts of SID to set ethaddr

Similar to the USB NIC found on OMAP5uEVM, PandaBoard and BeagleBoard-XM
boards, the sunxi SoCs have a NIC onboard without an embedded MAC address.

Just like the omap used on these boards, the sunxi SoCs do have a unique chip
id, in the form of the 128 bit SID register:
http://linux-sunxi.org/SID_Register_Guide

So mimick the BeagleBoard-XM board code (commit 548a64d8) and use the chip id
to generate a unique fixed MAC address.

We check for the SID not being all 0, since some early A20 batches
shipped without having there SID programmed.

Note we use specific parts of the 128 bits, since some parts indicate the
SoC family / revision, and thus are fixed. The algorithm for this was taken
from the linux-sunxi.org kernels.

Signed-off-by: Jonathan Liu <net147@gmail.com>
[hdegoede@redhat.com: Expanded the commit message with some more info]
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>

board/sunxi/board.c

@@ -19,9 +19,12 @@
 #include <axp209.h>
 #endif
 #include <asm/arch/clock.h>
+#include <asm/arch/cpu.h>
 #include <asm/arch/dram.h>
 #include <asm/arch/gpio.h>
 #include <asm/arch/mmc.h>
+#include <asm/io.h>
+#include <net.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -157,3 +160,28 @@ void sunxi_board_init(void)
 		printf("Failed to set core voltage! Can't set CPU frequency\n");
 }
 #endif
+
+#ifdef CONFIG_MISC_INIT_R
+int misc_init_r(void)
+{
+	if (!getenv("ethaddr")) {
+		uint32_t reg_val = readl(SUNXI_SID_BASE);
+
+		if (reg_val) {
+			uint8_t mac_addr[6];
+
+			mac_addr[0] = 0x02; /* Non OUI / registered MAC address */
+			mac_addr[1] = (reg_val >>  0) & 0xff;
+			reg_val = readl(SUNXI_SID_BASE + 0x0c);
+			mac_addr[2] = (reg_val >> 24) & 0xff;
+			mac_addr[3] = (reg_val >> 16) & 0xff;
+			mac_addr[4] = (reg_val >>  8) & 0xff;
+			mac_addr[5] = (reg_val >>  0) & 0xff;
+
+			eth_setenv_enetaddr("ethaddr", mac_addr);
+		}
+	}
+
+	return 0;
+}
+#endif

include/configs/sunxi-common.h

@@ -207,6 +207,8 @@
 #define CONFIG_ENV_IS_NOWHERE
 #endif
 
+#define CONFIG_MISC_INIT_R
+
 #ifndef CONFIG_SPL_BUILD
 #include <config_distro_defaults.h>
 #endif