hatch: Add sbmios_mainboard_sku function

BUG=b:122578255
BRANCH=None
TEST=mosys platform id/name/family

Change-Id: I6288ea1a4e9f692b6e04440e61f59ea53f01ebec
Signed-off-by: Shelley Chen <shchen@google.com>
Reviewed-on: https://review.coreboot.org/c/30944
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>

src/mainboard/google/hatch/mainboard.c

@@ -0,0 +1,53 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2019 Google LLC
+ *
+ * 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
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <boardid.h>
+#include <console/console.h>
+#include <ec/google/chromeec/ec.h>
+#include <smbios.h>
+#include <string.h>
+#include <stdint.h>
+
+#define SKU_UNKNOWN		0xFFFFFFFF
+#define SKU_MAX			255
+
+static uint32_t get_board_sku(void)
+{
+	static uint32_t sku_id = SKU_UNKNOWN;
+
+	if (sku_id != SKU_UNKNOWN)
+		return sku_id;
+
+	if (google_chromeec_cbi_get_sku_id(&sku_id))
+		sku_id = SKU_UNKNOWN;
+
+	return sku_id;
+}
+
+const char *smbios_mainboard_sku(void)
+{
+	static char sku_str[7]; /* sku{0..255} */
+	uint32_t sku_id = get_board_sku();
+
+	if ((sku_id == SKU_UNKNOWN) || (sku_id > SKU_MAX)) {
+		printk(BIOS_ERR, "%s: Unexpected SKU ID %u\n",
+			__func__, sku_id);
+		return "";
+	}
+
+	snprintf(sku_str, sizeof(sku_str), "sku%u", sku_id);
+
+	return sku_str;
+}