SANTHOSH JANARDHANA HASSAN has uploaded this change for review.

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google/mistrtal: Add board ID API.

BUG=None
TEST=Verified GPIO assignment and board ID values.
BRANCH=None

Change-Id: Ic81b41f799c7bfc47a0daee705db1c01cd0af1a3
Signed-off-by: Santhosh Hassan <sahassan@google.com>
---
M src/mainboard/google/mistral/Makefile.inc
A src/mainboard/google/mistral/boardid.c
2 files changed, 49 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/26/31426/1

diff --git a/src/mainboard/google/mistral/Makefile.inc b/src/mainboard/google/mistral/Makefile.inc
index e9013af..ae418f2 100644
--- a/src/mainboard/google/mistral/Makefile.inc
+++ b/src/mainboard/google/mistral/Makefile.inc
@@ -3,6 +3,7 @@
 bootblock-y += chromeos.c
 bootblock-y += bootblock.c
 
+verstage-y += boardid.c
 verstage-y += memlayout.ld
 verstage-y += chromeos.c
 verstage-y += verstage.c
@@ -10,7 +11,9 @@
 romstage-y += memlayout.ld
 romstage-y += chromeos.c
 romstage-y += romstage.c
+romstage-y += boardid.c
 
+ramstage-y += boardid.c
 ramstage-y += memlayout.ld
 ramstage-y += chromeos.c
 ramstage-y += mainboard.c
diff --git a/src/mainboard/google/mistral/boardid.c b/src/mainboard/google/mistral/boardid.c
new file mode 100644
index 0000000..f20960c
--- /dev/null
+++ b/src/mainboard/google/mistral/boardid.c
@@ -0,0 +1,46 @@
+/*
+ * 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>
+#include <console/console.h>
+#include <stdlib.h>
+
+/*
+ * Mistral boards dedicate to the board ID three GPIOs in ternary mode: 105, 106
+ * and 107.
+ */
+
+static uint32_t board_id_val = UNDEFINED_STRAPPING_ID;
+
+static uint32_t get_board_id(void)
+{
+	uint32_t bid;
+	const gpio_t pins[] = {[2] = GPIO(107), [1] = GPIO(106), [0] = GPIO(105)};
+
+	bid = gpio_binary_first_base3_value(pins, ARRAY_SIZE(pins));
+	printk(BIOS_INFO, "Board ID %d\n", bid);
+
+	return bid;
+}
+
+uint32_t board_id(void)
+{
+	if (board_id_val == UNDEFINED_STRAPPING_ID)
+		board_id_val = get_board_id();
+
+	return board_id_val;
+}
+

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