[PATCH v2 2/3] MdePkg: Add new PCDs for IPMI SSIF

["Tinh Nguyen" <tinhnguyen@os.amperecomputing.com>]

This change adds new PCDs for IPMI SSIF.

Specification reference:
https://www.intel.com/content/www/us/en/products/docs/servers/ipmi/ipmi-second-gen-interface-spec-v2-rev1-1.html

Signed-off-by: Tinh Nguyen <tinhnguyen@os.amperecomputing.com>
---
 MdePkg/MdePkg.dec | 26 ++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/MdePkg/MdePkg.dec b/MdePkg/MdePkg.dec
index 7488ccda7a00..b840092382cb 100644
--- a/MdePkg/MdePkg.dec
+++ b/MdePkg/MdePkg.dec
@@ -10,6 +10,7 @@
 # Copyright (c) 2022, Loongson Technology Corporation Limited. All rights reserved.<BR>
 # Copyright (c) 2021 - 2022, Arm Limited. All rights reserved.<BR>
 # Copyright (C) 2023 Advanced Micro Devices, Inc. All rights reserved.<BR>
+# Copyright (c) 2023, Ampere Computing LLC. All rights reserved.<BR>
 #
 # SPDX-License-Identifier: BSD-2-Clause-Patent
 #
@@ -2353,6 +2354,31 @@ [PcdsFixedAtBuild,PcdsPatchableInModule]
   # @Prompt IPMI KCS Interface I/O Base Address
   gEfiMdePkgTokenSpaceGuid.PcdIpmiKcsIoBaseAddress|0xca2|UINT16|0x00000031
 
+  ## This is SMBus slave address for the SSIF to the BMC.
+  #  The recommended value defined by IPMI specification is 0x20 (section 12.12).
+  # @Prompt IPMI SSIF SMBus slave address
+  gEfiMdePkgTokenSpaceGuid.PcdIpmiSsifSmbusSlaveAddr|0x20|UINT8|0x00000032
+
+  ## This is the maximum number of IPMI SSIF request retries.
+  #  The IPMI specification specified min value is 5 (section 12.17).
+  # @Prompt Number of IPMI SSIF request retries.
+  gEfiMdePkgTokenSpaceGuid.PcdIpmiSsifRequestRetryCount|0x05|UINT8|0x00000033
+
+  ## This is the required interval for each IPMI request retry.
+  #  The IPMI specification specified a time range of 60ms to 250ms (section 12.17).
+  #  The default setting is min.
+  # @Prompt Time between IPMI SSIF request retries.
+  gEfiMdePkgTokenSpaceGuid.PcdIpmiSsifRequestRetryIntervalMicrosecond|60000|UINT32|0x00000034
+
+  ## This value is the maximum retries of an IPMI SSIF response
+  # @Prompt Number of IPMI SSIF response retries.
+  gEfiMdePkgTokenSpaceGuid.PcdIpmiSsifResponseRetryCount|250|UINT8|0x00000035
+
+  ## This is the required interval for each IPMI response retry.
+  #  The IPMI specification specified min value is 60ms (section 12.17).
+  # @Prompt Time-out for a response, internal
+  gEfiMdePkgTokenSpaceGuid.PcdIpmiSsifResponseRetryIntervalMicrosecond|60000|UINT32|0x00000036
+
 [PcdsFixedAtBuild, PcdsPatchableInModule, PcdsDynamic, PcdsDynamicEx]
   ## This value is used to set the base address of PCI express hierarchy.
   # @Prompt PCI Express Base Address.
-- 
2.40.0