mb/google/drallion: add memory sku id

Drallion will use soldered down memory and use
GPP_F12 to GPP_F16 indicates mem_id.

BUG=b:139397313
BRANCH=N/A
TEST=N/A

Signed-off-by: Eric Lai <ericr_lai@compal.corp-partner.google.com>
Change-Id: Ib5ada54fd2b8f358b59de8089e5405cf3e34825a
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35133
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Mathew King <mathewk@chromium.org>

src/mainboard/google/drallion/variants/drallion/Makefile.inc

@@ -20,3 +20,5 @@ bootblock-y += gpio.c
 ramstage-y += gpio.c
 romstage-y += gpio.c
 verstage-y += gpio.c
+
+romstage-y += memory.c

src/mainboard/google/drallion/variants/drallion/include/variant/gpio.h

@@ -25,6 +25,13 @@
 /* Recovery mode */
 #define GPIO_REC_MODE		GPP_E8
 
+/* Memory configuration board straps */
+#define GPIO_MEM_CONFIG_0	GPP_F12
+#define GPIO_MEM_CONFIG_1	GPP_F13
+#define GPIO_MEM_CONFIG_2	GPP_F14
+#define GPIO_MEM_CONFIG_3	GPP_F15
+#define GPIO_MEM_CONFIG_4	GPP_F16
+
 const struct pad_config *variant_gpio_table(size_t *num);
 const struct pad_config *variant_early_gpio_table(size_t *num);
 

src/mainboard/google/drallion/variants/drallion/include/variant/variant.h

@@ -22,4 +22,7 @@
 #define VARIANT_SKU_ID_SIGNED_EC	4
 #define VARIANT_SKU_NAME_SIGNED_EC	"sku4"
 
+/* Return memory SKU for the variant */
+int variant_memory_sku(void);
+
 #endif

src/mainboard/google/drallion/variants/drallion/memory.c

@@ -0,0 +1,31 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2019 Google Inc.
+ *
+ * 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 <variant/variant.h>
+#include <gpio.h>
+#include <variant/gpio.h>
+
+int variant_memory_sku(void)
+{
+	gpio_t spd_gpios[] = {
+		GPIO_MEM_CONFIG_0,
+		GPIO_MEM_CONFIG_1,
+		GPIO_MEM_CONFIG_2,
+		GPIO_MEM_CONFIG_3,
+		GPIO_MEM_CONFIG_4,
+	};
+
+	return gpio_base2_value(spd_gpios, ARRAY_SIZE(spd_gpios));
+}