Dedede: Initiate the first version of parsing SSFC of CBI

Initiate the helper functions to parse the SSFC of CBI.
The first component define lid / base sensors in this version.

BUG=b:176314158, b:176314157
BRANCH=main
TEST=Make buildall PASS.

Change-Id: I1dbf06b7f2c8037a98e4d4c5c3d7beee556270ce
Signed-off-by: Ben Chen <ben.chen2@quanta.corp-partner.google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2603092
Reviewed-by: Diana Z <dzigterman@chromium.org>

3 files changed, 95 insertions, 2 deletions

diff --git a/baseboard/dedede/build.mk b/baseboard/dedede/build.mk
index e86d1976ed..c92c855b3a 100644
--- a/baseboard/dedede/build.mk
+++ b/baseboard/dedede/build.mk
@@ -1,11 +1,11 @@
 # -*- makefile -*-
-# Copyright 2020 The Chromium OS Authors. All rights reserved.
+# Copyright 2021 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.
 #
 # Baseboard specific files build
 #
 
-baseboard-y=baseboard.o cbi_fw_config.o
+baseboard-y=baseboard.o cbi_fw_config.o cbi_ssfc.o
 baseboard-$(VARIANT_DEDEDE_EC_NPCX796FC)+=variant_ec_npcx796fc.o
 baseboard-$(VARIANT_DEDEDE_EC_IT8320)+=variant_ec_it8320.o
diff --git a/baseboard/dedede/cbi_ssfc.c b/baseboard/dedede/cbi_ssfc.c
new file mode 100644
index 0000000000..d49e1b0843
--- /dev/null
+++ b/baseboard/dedede/cbi_ssfc.c
@@ -0,0 +1,37 @@
+/* Copyright 2021 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_ssfc.h"
+#include "common.h"
+#include "console.h"
+#include "cros_board_info.h"
+#include "hooks.h"
+
+#define CPRINTS(format, args...) cprints(CC_SYSTEM, format, ##args)
+
+/* Cache SSFC on init since we don't expect it to change in runtime */
+static union dedede_cbi_ssfc cached_ssfc;
+BUILD_ASSERT(sizeof(cached_ssfc) == sizeof(uint32_t));
+
+static void cbi_ssfc_init(void)
+{
+	if (cbi_get_ssfc(&cached_ssfc.raw_value) != EC_SUCCESS)
+		/* Default to 0 when CBI isn't populated */
+		cached_ssfc.raw_value = 0;
+
+	CPRINTS("Read CBI SSFC : 0x%04X", cached_ssfc.raw_value);
+}
+DECLARE_HOOK(HOOK_INIT, cbi_ssfc_init, HOOK_PRIO_FIRST);
+
+enum ec_ssfc_base_sensor get_cbi_ssfc_base_sensor(void)
+{
+	return cached_ssfc.base_sensor;
+}
+
+enum ec_ssfc_lid_sensor get_cbi_ssfc_lid_sensor(void)
+{
+	return cached_ssfc.lid_sensor;
+}
+
diff --git a/baseboard/dedede/cbi_ssfc.h b/baseboard/dedede/cbi_ssfc.h
new file mode 100644
index 0000000000..6b46a39839
--- /dev/null
+++ b/baseboard/dedede/cbi_ssfc.h
@@ -0,0 +1,56 @@
+/* Copyright 2021 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 _DEDEDE_CBI_SSFC__H_
+#define _DEDEDE_CBI_SSFC__H_
+
+#include "stdint.h"
+
+/****************************************************************************
+ * Dedede CBI Second Source Factory Cache
+ */
+
+/*
+ * Base Sensor (Bits 0-2)
+ */
+enum ec_ssfc_base_sensor {
+	SSFC_SENSOR_BASE_DEFAULT = 0,
+	SSFC_SENSOR_BMI160 = 1,
+	SSFC_SENSOR_ICM426XX = 2
+};
+
+/*
+ * Lid Sensor (Bits 3-5)
+ */
+enum ec_ssfc_lid_sensor {
+	SSFC_SENSOR_LID_DEFAULT = 0,
+	SSFC_SENSOR_BMA255 = 1,
+	SSFC_SENSOR_KX022 = 2
+};
+
+union dedede_cbi_ssfc {
+	struct {
+		enum ec_ssfc_base_sensor	base_sensor : 3;
+		enum ec_ssfc_lid_sensor		lid_sensor : 3;
+		uint32_t					reserved_2 : 26;
+	};
+	uint32_t raw_value;
+};
+
+/**
+ * Get the Base sensor type from SSFC_CONFIG.
+ *
+ * @return the Base sensor board type.
+ */
+enum ec_ssfc_base_sensor get_cbi_ssfc_base_sensor(void);
+
+/**
+ * Get the Lid sensor type from SSFC_CONFIG.
+ *
+ * @return the Lid sensor board type.
+ */
+enum ec_ssfc_lid_sensor get_cbi_ssfc_lid_sensor(void);
+
+#endif /* _DEDEDE_CBI_SSFC__H_ */