2 Platform Hook Library instance for UART device.
4 Copyright (c) 2021, Intel Corporation. All rights reserved.<BR>
5 SPDX-License-Identifier: BSD-2-Clause-Patent
11 #include <UniversalPayload/SerialPortInfo.h>
12 #include <Library/PlatformHookLib.h>
13 #include <Library/PcdLib.h>
14 #include <Library/HobLib.h>
16 /** Library Constructor
18 @retval RETURN_SUCCESS Success.
22 PlatformHookSerialPortConstructor (
26 // Nothing to do here. This constructor is added to
27 // enable the chain of constructor invocation for
28 // dependent libraries.
29 return RETURN_SUCCESS
;
33 Performs platform specific initialization required for the CPU to access
34 the hardware associated with a SerialPortLib instance. This function does
35 not initialize the serial port hardware itself. Instead, it initializes
36 hardware devices that are required for the CPU to access the serial port
37 hardware. This function may be called more than once.
39 @retval RETURN_SUCCESS The platform specific initialization succeeded.
40 @retval RETURN_DEVICE_ERROR The platform specific initialization could not be completed.
45 PlatformHookSerialPortInitialize (
50 UNIVERSAL_PAYLOAD_SERIAL_PORT_INFO
*SerialPortInfo
;
52 UNIVERSAL_PAYLOAD_GENERIC_HEADER
*GenericHeader
;
54 GuidHob
= GetFirstGuidHob (&gUniversalPayloadSerialPortInfoGuid
);
55 if (GuidHob
== NULL
) {
59 GenericHeader
= (UNIVERSAL_PAYLOAD_GENERIC_HEADER
*)GET_GUID_HOB_DATA (GuidHob
);
60 if ((sizeof (UNIVERSAL_PAYLOAD_GENERIC_HEADER
) > GET_GUID_HOB_DATA_SIZE (GuidHob
)) || (GenericHeader
->Length
> GET_GUID_HOB_DATA_SIZE (GuidHob
))) {
64 if (GenericHeader
->Revision
== UNIVERSAL_PAYLOAD_SERIAL_PORT_INFO_REVISION
) {
65 SerialPortInfo
= (UNIVERSAL_PAYLOAD_SERIAL_PORT_INFO
*)GET_GUID_HOB_DATA (GuidHob
);
66 if (GenericHeader
->Length
< UNIVERSAL_PAYLOAD_SIZEOF_THROUGH_FIELD (UNIVERSAL_PAYLOAD_SERIAL_PORT_INFO
, RegisterBase
)) {
68 // Return if can't find the Serial Port Info Hob with enough length
73 Status
= PcdSetBoolS (PcdSerialUseMmio
, SerialPortInfo
->UseMmio
);
74 if (RETURN_ERROR (Status
)) {
78 Status
= PcdSet64S (PcdSerialRegisterBase
, SerialPortInfo
->RegisterBase
);
79 if (RETURN_ERROR (Status
)) {
83 Status
= PcdSet32S (PcdSerialRegisterStride
, SerialPortInfo
->RegisterStride
);
84 if (RETURN_ERROR (Status
)) {
88 Status
= PcdSet32S (PcdSerialBaudRate
, SerialPortInfo
->BaudRate
);
89 if (RETURN_ERROR (Status
)) {
93 return RETURN_SUCCESS
;