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/** @file
PEI Phase Early Platform Hook Library instance for 16550 Uart.
Copyright (c) 2020 - 2023, Arm Ltd. All rights reserved.<BR>
Copyright (c) 2024 Loongson Technology Corporation Limited. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Library/BaseLib.h>
#include <Library/FdtSerialPortAddressLib.h>
#include <Library/PcdLib.h>
#include <Library/PlatformHookLib.h>
#include <Register/LoongArch64/Csr.h>
/** Platform hook to retrieve the 16550 UART base address from the platform
Device tree and store it in the reigster LOONGARCH_CSR_KS1.
@retval RETURN_SUCCESS Success.
@retval RETURN_INVALID_PARAMETER A parameter was invalid.
@retval RETURN_NOT_FOUND Serial port information not found.
**/
RETURN_STATUS
EFIAPI
PlatformHookSerialPortInitialize (
VOID
)
{
RETURN_STATUS Status;
VOID *DeviceTreeBase;
UINT64 SerialConsoleAddress;
if (PcdGet64 (PcdSerialRegisterBase) != 0) {
return RETURN_SUCCESS;
}
DeviceTreeBase = (VOID *)(UINTN)PcdGet64 (PcdDeviceTreeInitialBaseAddress);
if (DeviceTreeBase == NULL) {
return RETURN_NOT_FOUND;
}
Status = FdtSerialGetConsolePort (DeviceTreeBase, &SerialConsoleAddress);
if (RETURN_ERROR (Status)) {
return Status;
}
CsrWrite (LOONGARCH_CSR_KS1, (UINTN)SerialConsoleAddress);
return RETURN_SUCCESS;
}
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