fby4: sd: Obtain BIOS information via PLDM SMBIOS

# Description:
- Enable KSC for setting bios information.

# Motivation:
- Support BMC can obtain BIOS version by standard PLDM command.

# Test plan:
- BMC can get bios version from bic.

# Log:

[First query]
root@bmc:/tmp#  pldmtool raw -m 40 -v -d 0x80 0x01 0x05 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
pldmtool: Tx: 80 01 05 00 00 00 00 00 00 00 00
pldmtool: Rx: 00 01 05 00 00 00 00 00 05 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

[Power on the host]
root@bmc:/tmp# busctl set-property xyz.openbmc_project.State.Host4 /xyz/openbmc_project/state/host4 xyz.openbmc_project.State.Host RequestedHostTransition s "xyz.openbmc_project.State.Host.Transition.On"

[Wait for post code complete and query again]
root@bmc:/tmp#  pldmtool raw -m 40 -v -d 0x80 0x01 0x05 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
pldmtool: Tx: 80 01 05 00 00 00 00 00 00 00 00
pldmtool: Rx: 00 01 05 00 00 00 00 00 05 00 0c 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 59 34 54 52 5f 31 31 30 38 00 00
                                                         |
                                                        [bios version: first text string]                              [Y4TR_1108]

meta-facebook/yv4-sd/boards/ast1030_evb.overlay

@@ -223,3 +223,8 @@
 	dma-mode;
 	dma-ringbuf-size = <0x4000>;
 };
+
+&kcs3 {
+  status = "okay";
+  addr = <0xca2>;
+};

meta-facebook/yv4-sd/src/platform/plat_init.c

@@ -32,6 +32,7 @@
 #include "plat_pldm_monitor.h"
 #include "plat_class.h"
 #include "pcc.h"
+#include "plat_kcs.h"
 
 void pal_pre_init()
 {
@@ -78,6 +79,7 @@ void pal_post_init()
 {
 	plat_mctp_init();
 	pcc_init();
+	kcs_init();
 	pldm_load_state_effecter_table(PLAT_PLDM_MAX_STATE_EFFECTER_IDX);
 	pldm_assign_gpio_effecter_id(PLAT_EFFECTER_ID_GPIO_HIGH_BYTE);
 }

meta-facebook/yv4-sd/src/platform/plat_kcs.c

@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "plat_kcs.h"
+#include "kcs.h"
+
+void kcs_init(void)
+{
+	char *kcs_config[] = { "KCS3" };
+	kcs_device_init(kcs_config, ARRAY_SIZE(kcs_config));
+}

meta-facebook/yv4-sd/src/platform/plat_kcs.h

@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef PLAT_KCS_H
+#define PLAT_KCS_H
+
+void kcs_init(void);
+
+#endif