cheza: Add board ID, RAM code and SKU ID

This patch adds the required callbacks to read all strapping IDs on
Cheza.

Change-Id: I6437bbd03bdd00dfeedcafebabeb00b13588d052
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/27789
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
diff --git a/src/mainboard/google/cheza/Makefile.inc b/src/mainboard/google/cheza/Makefile.inc
index 0e2f6bd..04099e2 100644
--- a/src/mainboard/google/cheza/Makefile.inc
+++ b/src/mainboard/google/cheza/Makefile.inc
@@ -1,15 +1,33 @@
+##
+## This file is part of the coreboot project.
+##
+## Copyright 2018 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.
+##
 
+bootblock-y += boardid.c
 bootblock-y += memlayout.ld
 bootblock-y += chromeos.c
 bootblock-y += bootblock.c
 
+verstage-y += boardid.c
 verstage-y += memlayout.ld
 verstage-y += chromeos.c
 
+romstage-y += boardid.c
 romstage-y += memlayout.ld
 romstage-y += chromeos.c
 romstage-y += romstage.c
 
+ramstage-y += boardid.c
 ramstage-y += memlayout.ld
 ramstage-y += chromeos.c
 ramstage-y += mainboard.c
diff --git a/src/mainboard/google/cheza/boardid.c b/src/mainboard/google/cheza/boardid.c
new file mode 100644
index 0000000..fffac82
--- /dev/null
+++ b/src/mainboard/google/cheza/boardid.c
@@ -0,0 +1,50 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2018 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 <gpio.h>
+
+uint32_t board_id(void)
+{
+	const gpio_t pins[] = {[2] = GPIO(51), [1] = GPIO(62), [0] = GPIO(38)};
+	static uint32_t id = UNDEFINED_STRAPPING_ID;
+
+	if (id == UNDEFINED_STRAPPING_ID)
+		id = gpio_base2_value(pins, ARRAY_SIZE(pins));
+
+	return id;
+}
+
+uint32_t ram_code(void)
+{
+	const gpio_t pins[] = {[1] = GPIO(147), [0] = GPIO(146)};
+	static uint32_t id = UNDEFINED_STRAPPING_ID;
+
+	if (id == UNDEFINED_STRAPPING_ID)
+		id = gpio_base2_value(pins, ARRAY_SIZE(pins));
+
+	return id;
+}
+
+uint32_t sku_id(void)
+{
+	const gpio_t pins[] = {[1] = GPIO(113), [0] = GPIO(79)};
+	static uint32_t id = UNDEFINED_STRAPPING_ID;
+
+	if (id == UNDEFINED_STRAPPING_ID)
+		id = gpio_base2_value(pins, ARRAY_SIZE(pins));
+
+	return id;
+}