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/** @file
Platform Hook Library instance for 16550 Uart.
Copyright (c) 2020, 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/PcdLib.h>
#include <Register/LoongArch64/Csr.h>
/** Platform hook to retrieve the 16550 UART base address from register
LOONGARCH_CSR_KS1 that caches the UART base address from early boot
stage and store it in PcdSerialRegisterBase.
@retval RETURN_SUCCESS Success.
@retval RETURN_NOT_FOUND Serial Port information not found.
**/
RETURN_STATUS
EFIAPI
PlatformHookSerialPortInitialize (
VOID
)
{
UINT64 *UartBase;
if (PcdGet64 (PcdSerialRegisterBase) != 0) {
return RETURN_SUCCESS;
}
*UartBase = CsrRead (LOONGARCH_CSR_KS1);
return (RETURN_STATUS)PcdSet64S (PcdSerialRegisterBase, (UINTN)*UartBase);
}
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