dojo: Set up board FW_CONFIG parsing

Set up basic file to use for parsing FW_CONFIG. Currently, this just
has a function to return the KB BL type and KB layout type.

BUG=b:221315327
BRANCH=cherry
TEST=make sure FW_CONFIG prints current value correctly.

Signed-off-by: Tommy Chung <tommy.chung@quanta.corp-partner.google.com>
Change-Id: I1b220faf39868ee1b4716a54bb165fd693fba4de
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3598692
Reviewed-by: Devin Lu <Devin.Lu@quantatw.com>
Reviewed-by: Ting Shen <phoenixshen@chromium.org>

3 files changed, 78 insertions, 1 deletions

diff --git a/board/dojo/build.mk b/board/dojo/build.mk
index 0b0569c6d8..25af05d562 100644
--- a/board/dojo/build.mk
+++ b/board/dojo/build.mk
@@ -11,4 +11,4 @@ CHIP_FAMILY:=it8xxx2
 CHIP_VARIANT:=it81202bx_1024
 BASEBOARD:=cherry
 
-board-y+=led.o battery.o board.o
+board-y+=led.o battery.o board.o cbi_fw_config.o
diff --git a/board/dojo/cbi_fw_config.c b/board/dojo/cbi_fw_config.c
new file mode 100644
index 0000000000..9972e02249
--- /dev/null
+++ b/board/dojo/cbi_fw_config.c
@@ -0,0 +1,41 @@
+/* Copyright 2022 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "cbi_fw_config.h"
+#include "common.h"
+#include "console.h"
+#include "cros_board_info.h"
+#include "hooks.h"
+
+/****************************************************************************
+ * Dojo CBI FW Configuration
+ */
+
+#define CPRINTS(format, args...) cprints(CC_SYSTEM, format, ##args)
+
+/* Cache FW_CONFIG on init since we don't expect it to change in runtime */
+static uint32_t cached_fw_config;
+
+static void cbi_fw_config_init(void)
+{
+	if (cbi_get_fw_config(&cached_fw_config) != EC_SUCCESS)
+		/* Default to 0 when CBI isn't populated */
+		cached_fw_config = 0;
+
+	CPRINTS("FW_CONFIG: 0x%04X", cached_fw_config);
+}
+DECLARE_HOOK(HOOK_INIT, cbi_fw_config_init, HOOK_PRIO_FIRST);
+
+enum fw_config_kblight_type get_cbi_fw_config_kblight(void)
+{
+	return ((cached_fw_config & FW_CONFIG_KB_BL_MASK)
+			>> FW_CONFIG_KB_BL_OFFSET);
+}
+
+enum fw_config_kblayout_type get_cbi_fw_config_kblayout(void)
+{
+	return ((cached_fw_config & FW_CONFIG_KB_LAYOUT_MASK)
+			>> FW_CONFIG_KB_LAYOUT_OFFSET);
+}
diff --git a/board/dojo/cbi_fw_config.h b/board/dojo/cbi_fw_config.h
new file mode 100644
index 0000000000..7f98585b84
--- /dev/null
+++ b/board/dojo/cbi_fw_config.h
@@ -0,0 +1,36 @@
+/* Copyright 2022 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef _DOJO_CBI_FW_CONFIG__H_
+#define _DOJO_CBI_FW_CONFIG__H_
+
+/****************************************************************************
+ * Dojo CBI FW Configuration
+ */
+
+/*
+ * Keyboard backlight (bit 0)
+ */
+enum fw_config_kblight_type {
+	KB_BL_ABSENT = 0,
+	KB_BL_PRESENT = 1,
+};
+#define FW_CONFIG_KB_BL_OFFSET			0
+#define FW_CONFIG_KB_BL_MASK			GENMASK(0, 0)
+
+/*
+ * Keyboard layout (bit 4-5)
+ */
+enum fw_config_kblayout_type {
+	KB_BL_TOGGLE_KEY_ABSENT = 0, /* Vol-up key on T12 */
+	KB_BL_TOGGLE_KEY_PRESENT = 1, /* Vol-up key on T13 */
+};
+#define FW_CONFIG_KB_LAYOUT_OFFSET		4
+#define FW_CONFIG_KB_LAYOUT_MASK		GENMASK(5, 4)
+
+enum fw_config_kblight_type get_cbi_fw_config_kblight(void);
+enum fw_config_kblayout_type get_cbi_fw_config_kblayout(void);
+
+#endif /* _DOJO_CBI_FW_CONFIG__H_ */