mirror of https://github.com/acidanthera/audk.git
151 lines
3.9 KiB
C
151 lines
3.9 KiB
C
/** @file
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Serial I/O Port library functions with base address discovered from FDT
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Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>
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Copyright (c) 2012 - 2013, ARM Ltd. All rights reserved.<BR>
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Copyright (c) 2014, Linaro Ltd. All rights reserved.<BR>
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Copyright (c) 2014, Red Hat, Inc.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include <Base.h>
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#include <Library/PcdLib.h>
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#include <Library/SerialPortLib.h>
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#include <Pi/PiBootMode.h>
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#include <Uefi/UefiBaseType.h>
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#include <Uefi/UefiMultiPhase.h>
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#include <Pi/PiHob.h>
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#include <Library/HobLib.h>
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#include <Guid/EarlyPL011BaseAddress.h>
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#include <Drivers/PL011Uart.h>
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STATIC UINTN mSerialBaseAddress;
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RETURN_STATUS
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EFIAPI
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SerialPortInitialize (
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VOID
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)
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{
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return RETURN_SUCCESS;
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}
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/**
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Program hardware of Serial port
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@return RETURN_NOT_FOUND if no PL011 base address could be found
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Otherwise, result of PL011UartInitializePort () is returned
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**/
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RETURN_STATUS
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EFIAPI
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FdtPL011SerialPortLibInitialize (
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VOID
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)
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{
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VOID *Hob;
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CONST UINT64 *UartBase;
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UINT64 BaudRate;
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UINT32 ReceiveFifoDepth;
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EFI_PARITY_TYPE Parity;
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UINT8 DataBits;
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EFI_STOP_BITS_TYPE StopBits;
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Hob = GetFirstGuidHob (&gEarlyPL011BaseAddressGuid);
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if (Hob == NULL || GET_GUID_HOB_DATA_SIZE (Hob) != sizeof *UartBase) {
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return RETURN_NOT_FOUND;
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}
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UartBase = GET_GUID_HOB_DATA (Hob);
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mSerialBaseAddress = (UINTN)*UartBase;
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if (mSerialBaseAddress == 0) {
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return RETURN_NOT_FOUND;
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}
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BaudRate = (UINTN)PcdGet64 (PcdUartDefaultBaudRate);
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ReceiveFifoDepth = 0; // Use the default value for Fifo depth
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Parity = (EFI_PARITY_TYPE)PcdGet8 (PcdUartDefaultParity);
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DataBits = PcdGet8 (PcdUartDefaultDataBits);
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StopBits = (EFI_STOP_BITS_TYPE) PcdGet8 (PcdUartDefaultStopBits);
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return PL011UartInitializePort (
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mSerialBaseAddress, &BaudRate, &ReceiveFifoDepth,
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&Parity, &DataBits, &StopBits);
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}
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/**
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Write data to serial device.
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@param Buffer Point of data buffer which need to be written.
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@param NumberOfBytes Number of output bytes which are cached in Buffer.
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@retval 0 Write data failed.
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@retval !0 Actual number of bytes written to serial device.
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**/
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UINTN
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EFIAPI
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SerialPortWrite (
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IN UINT8 *Buffer,
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IN UINTN NumberOfBytes
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)
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{
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if (mSerialBaseAddress != 0) {
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return PL011UartWrite (mSerialBaseAddress, Buffer, NumberOfBytes);
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}
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return 0;
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}
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/**
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Read data from serial device and save the data in buffer.
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@param Buffer Point of data buffer which need to be written.
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@param NumberOfBytes Number of output bytes which are cached in Buffer.
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@retval 0 Read data failed.
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@retval !0 Actual number of bytes read from serial device.
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**/
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UINTN
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EFIAPI
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SerialPortRead (
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OUT UINT8 *Buffer,
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IN UINTN NumberOfBytes
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)
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{
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if (mSerialBaseAddress != 0) {
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return PL011UartRead (mSerialBaseAddress, Buffer, NumberOfBytes);
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}
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return 0;
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}
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/**
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Check to see if any data is available to be read from the debug device.
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@retval TRUE At least one byte of data is available to be read
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@retval FALSE No data is available to be read
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**/
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BOOLEAN
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EFIAPI
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SerialPortPoll (
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VOID
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)
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{
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if (mSerialBaseAddress != 0) {
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return PL011UartPoll (mSerialBaseAddress);
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}
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return FALSE;
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}
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