siemens/mc_bdx1: Set up MAC address for available i210 MACs

Enable the usage of DRIVER_INTEL_I210 and provide a function to search
for a valid MAC address for all i210 devices using hwilib.

Change-Id: Ic0f4f1579364cf5b0111334a05a8a0926785318b
Signed-off-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-on: https://review.coreboot.org/15517
Tested-by: build bot (Jenkins)
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
diff --git a/src/mainboard/siemens/mc_bdx1/Kconfig b/src/mainboard/siemens/mc_bdx1/Kconfig
index e33b14a..f947f3d 100644
--- a/src/mainboard/siemens/mc_bdx1/Kconfig
+++ b/src/mainboard/siemens/mc_bdx1/Kconfig
@@ -9,6 +9,8 @@
 	select TSC_MONOTONIC_TIMER
 	select HAVE_FSP_BIN if FSP_PACKAGE_DEFAULT
 	select CBFS_AUTOGEN_ATTRIBUTES
+	select USE_SIEMENS_HWILIB
+	select DRIVER_INTEL_I210
 
 config MAINBOARD_DIR
 	string
diff --git a/src/mainboard/siemens/mc_bdx1/mainboard.c b/src/mainboard/siemens/mc_bdx1/mainboard.c
index 58da036..af886a9 100644
--- a/src/mainboard/siemens/mc_bdx1/mainboard.c
+++ b/src/mainboard/siemens/mc_bdx1/mainboard.c
@@ -3,6 +3,7 @@
  *
  * Copyright (C) 2007-2009 coresystems GmbH
  * Copyright (C) 2011 Google Inc.
+ * Copyright (C) 2016 Siemens AG
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -17,7 +18,6 @@
 #include <types.h>
 #include <string.h>
 #include <device/device.h>
-#include <device/device.h>
 #include <device/pci_def.h>
 #include <device/pci_ops.h>
 #include <console/console.h>
@@ -29,7 +29,11 @@
 #include <arch/io.h>
 #include <arch/interrupt.h>
 #include <boot/coreboot_tables.h>
+#include <hwilib.h>
+#include <i210.h>
 
+#define MAX_PATH_DEPTH		12
+#define MAX_NUM_MAPPINGS	10
 /*
  * mainboard_enable is executed as first thing after enumerate_buses().
  * This is the earliest point to add customization.
@@ -38,6 +42,77 @@
 {
 
 }
+/** \brief This function can decide if a given MAC address is valid or not.
+ *         Currently, addresses filled with 0xff or 0x00 are not valid.
+ * @param  mac  Buffer to the MAC address to check
+ * @return	0 if address is not valid, otherwise 1
+ */
+static uint8_t is_mac_adr_valid(uint8_t mac[6])
+{
+	uint8_t buf[6];
+
+	memset(buf, 0, sizeof(buf));
+	if (!memcmp(buf, mac, sizeof(buf)))
+		return 0;
+	memset(buf, 0xff, sizeof(buf));
+	if (!memcmp(buf, mac, sizeof(buf)))
+		return 0;
+	return 1;
+}
+ /** \brief This function will search for a MAC address which can be assigned
+  *         to a MACPHY.
+  * @param  dev     pointer to 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(struct device *dev, uint8_t mac[6])
+{
+	struct bus *parent = dev->bus;
+	uint8_t buf[16], mapping[16], i = 0, chain_len = 0;
+
+	memset(buf, 0, sizeof(buf));
+	memset(mapping, 0, sizeof(mapping));
+
+	/* The first entry in the tree is the device itself. */
+	buf[0] = dev->path.pci.devfn;
+	chain_len = 1;
+	for (i = 1; i < MAX_PATH_DEPTH && parent->dev->bus->subordinate; i++) {
+		buf[i] = parent->dev->path.pci.devfn;
+		chain_len++;
+		parent = parent->dev->bus;
+	}
+	if (i == MAX_PATH_DEPTH) {
+		/* The path is deeper than MAX_PATH_DEPTH devices, error. */
+		printk(BIOS_ERR, "Too many bridges for %s\n", dev_path(dev));
+		return CB_ERR;
+	}
+	/* Now construct the mapping based on the device chain starting from */
+	/* root bridge device to the device itself. */
+	mapping[0] = 1;
+	mapping[1] = chain_len;
+	for (i = 0; i < chain_len; i++)
+		mapping[i + 4] = buf[chain_len - i - 1];
+
+	/* Open main hwinfo block */
+	if (hwilib_find_blocks("hwinfo.hex") != CB_SUCCESS)
+		return CB_ERR;
+	/* Now try to find a valid MAC address in hwinfo for this mapping.*/
+	for (i = 0; i < MAX_NUM_MAPPINGS; i++) {
+		if ((hwilib_get_field(XMac1Mapping + i, buf, 16) == 16) &&
+			!(memcmp(buf, mapping, chain_len + 4))) {
+		/* There is a matching mapping available, get MAC address. */
+			if ((hwilib_get_field(XMac1 + i, mac, 6) == 6) &&
+			    (is_mac_adr_valid(mac))) {
+				return CB_SUCCESS;
+			} else {
+				return CB_ERR;
+			}
+		} else
+			continue;
+	}
+	/* No MAC address found for */
+	return CB_ERR;
+}
 
 struct chip_operations mainboard_ops = {
 	.enable_dev = mainboard_enable,