ARM: meson: add unique MAC address generation
Add support for generating an unique MAC address using the SoC internal
serial number from the Secure Monitor interface.
The algorithm generates an unicast locally administered 6bytes minus 2bits
address using an crc16 of the serial for the top 16bits with the lower 2 bits
masked to setup the unicast locally administered property and a crc24 for
the lower 24bits.
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
diff --git a/arch/arm/mach-meson/board-common.c b/arch/arm/mach-meson/board-common.c
index 8c41301..18383f7 100644
--- a/arch/arm/mach-meson/board-common.c
+++ b/arch/arm/mach-meson/board-common.c
@@ -7,6 +7,7 @@
#include <asm/arch/boot.h>
#include <linux/libfdt.h>
#include <linux/err.h>
+#include <environment.h>
#include <asm/arch/mem.h>
#include <asm/arch/sm.h>
#include <asm/armv8/mmu.h>
@@ -67,6 +68,36 @@
}
}
+int meson_generate_serial_ethaddr(void)
+{
+ u8 mac_addr[ARP_HLEN];
+ char serial[SM_SERIAL_SIZE];
+ u32 sid;
+ u16 sid16;
+
+ if (!meson_sm_get_serial(serial, SM_SERIAL_SIZE)) {
+ sid = crc32(0, (unsigned char *)serial, SM_SERIAL_SIZE);
+ sid16 = crc16_ccitt(0, (unsigned char *)serial, SM_SERIAL_SIZE);
+
+ /* Ensure the NIC specific bytes of the mac are not all 0 */
+ if ((sid & 0xffffff) == 0)
+ sid |= 0x800000;
+
+ /* Non OUI / registered MAC address */
+ mac_addr[0] = ((sid16 >> 8) & 0xfc) | 0x02;
+ mac_addr[1] = (sid16 >> 0) & 0xff;
+ mac_addr[2] = (sid >> 24) & 0xff;
+ mac_addr[3] = (sid >> 16) & 0xff;
+ mac_addr[4] = (sid >> 8) & 0xff;
+ mac_addr[5] = (sid >> 0) & 0xff;
+
+ eth_env_set_enetaddr("ethaddr", mac_addr);
+ } else
+ return -EINVAL;
+
+ return 0;
+}
+
static void meson_set_boot_source(void)
{
const char *source;