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/** @file
Platform Hook Library instance for UART device upon coreboot.
Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include <Base.h>
#include <Uefi/UefiBaseType.h>
#include <Library/PlatformHookLib.h>
#include <Library/CbParseLib.h>
#include <Library/PcdLib.h>
/**
Performs platform specific initialization required for the CPU to access
the hardware associated with a SerialPortLib instance. This function does
not intiailzie the serial port hardware itself. Instead, it initializes
hardware devices that are required for the CPU to access the serial port
hardware. This function may be called more than once.
@retval RETURN_SUCCESS The platform specific initialization succeeded.
@retval RETURN_DEVICE_ERROR The platform specific initialization could not be completed.
**/
RETURN_STATUS
EFIAPI
PlatformHookSerialPortInitialize (
VOID
)
{
RETURN_STATUS Status;
UINT32 SerialRegBase;
UINT32 SerialRegAccessType;
Status = CbParseSerialInfo (&SerialRegBase, &SerialRegAccessType, NULL);
if (RETURN_ERROR (Status)) {
return Status;
}
if (SerialRegAccessType == 2) { //MMIO
Status = PcdSetBoolS (PcdSerialUseMmio, TRUE);
} else { //IO
Status = PcdSetBoolS (PcdSerialUseMmio, FALSE);
}
if (RETURN_ERROR (Status)) {
return Status;
}
Status = PcdSet64S (PcdSerialRegisterBase, (UINT64) SerialRegBase);
if (RETURN_ERROR (Status)) {
return Status;
}
return RETURN_SUCCESS;
}
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