mc_tcu3: Switch to hwilib instead of own hwinfo implementation

Use hwilib in vendorcode/siemens/hwilib to get fields from hwinfo
instead of having mainboard specific hwinfo code.
This patch does not change the functional behavior in any way.

Change-Id: Idb226a82a08b1b753f654c5cde106236e72f33c3
Signed-off-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-on: https://review.coreboot.org/14506
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

1 files changed, 39 insertions, 1 deletions

diff --git a/src/mainboard/siemens/mc_tcu3/mainboard.c b/src/mainboard/siemens/mc_tcu3/mainboard.c
index 8a966dcc84..e9c29a07b5 100644
--- a/src/mainboard/siemens/mc_tcu3/mainboard.c
+++ b/src/mainboard/siemens/mc_tcu3/mainboard.c
@@ -29,9 +29,47 @@
 #include <arch/io.h>
 #include <arch/interrupt.h>
 #include <boot/coreboot_tables.h>
-
+#include <hwilib.h>
 #include "lcd_panel.h"
 
+
+/** \brief This function will search for a MAC address which can be assigned
+ *         to a MACPHY.
+ * @param  pci_bdf Bus, device and function of the given PCI-device
+ * @param  mac     buffer where to store the MAC address
+ * @return cb_err  CB_ERR or CB_SUCCESS
+ */
+enum cb_err mainboard_get_mac_address(u16 bus, u8 devfn, u8 mac[6])
+{
+	uint8_t mac_adr[6];
+	u32 i;
+
+	/* Open main hwinfo block */
+	if (hwilib_find_blocks("hwinfo.hex") != CB_SUCCESS)
+		return CB_ERR;
+	/* Get first MAC address from hwinfo. */
+	if (hwilib_get_field(Mac1, mac_adr, sizeof(mac_adr)) != sizeof(mac_adr))
+		return CB_ERR;
+	/* Ensure the first MAC-Address is not completely 0x00 or 0xff */
+	for (i = 0; i < 6; i++) {
+		if (mac_adr[i] != 0xFF)
+			break;
+	}
+	if (i == 6){
+		return CB_ERR;
+	}
+	for (i = 0; i < 6; i++) {
+		if (mac_adr[i] != 0x00)
+			break;
+	}
+	if (i == 6){
+		return CB_ERR;
+	} else {
+		memcpy(mac, mac_adr, 6);
+		return CB_SUCCESS;
+	}
+}
+
 /*
  * mainboard_enable is executed as first thing after enumerate_buses().
  * This is the earliest point to add customization.