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- /** @file
- Serial I/O Port library functions with base address discovered from FDT
- Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>
- Copyright (c) 2012 - 2013, ARM Ltd. All rights reserved.<BR>
- Copyright (c) 2014, Linaro Ltd. All rights reserved.<BR>
- Copyright (c) 2014, Red Hat, Inc.<BR>
- Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
- SPDX-License-Identifier: BSD-2-Clause-Patent
- **/
- #include <Base.h>
- #include <Library/PcdLib.h>
- #include <Library/PL011UartLib.h>
- #include <Library/SerialPortLib.h>
- #include <Pi/PiBootMode.h>
- #include <Uefi/UefiBaseType.h>
- #include <Uefi/UefiMultiPhase.h>
- #include <Pi/PiHob.h>
- #include <Library/HobLib.h>
- #include <Guid/EarlyPL011BaseAddress.h>
- STATIC UINTN mSerialBaseAddress;
- RETURN_STATUS
- EFIAPI
- SerialPortInitialize (
- VOID
- )
- {
- return RETURN_SUCCESS;
- }
- /**
- Program hardware of Serial port
- @return RETURN_NOT_FOUND if no PL011 base address could be found
- Otherwise, result of PL011UartInitializePort () is returned
- **/
- RETURN_STATUS
- EFIAPI
- FdtPL011SerialPortLibInitialize (
- VOID
- )
- {
- VOID *Hob;
- CONST UINT64 *UartBase;
- UINT64 BaudRate;
- UINT32 ReceiveFifoDepth;
- EFI_PARITY_TYPE Parity;
- UINT8 DataBits;
- EFI_STOP_BITS_TYPE StopBits;
- Hob = GetFirstGuidHob (&gEarlyPL011BaseAddressGuid);
- if (Hob == NULL || GET_GUID_HOB_DATA_SIZE (Hob) != sizeof *UartBase) {
- return RETURN_NOT_FOUND;
- }
- UartBase = GET_GUID_HOB_DATA (Hob);
- mSerialBaseAddress = (UINTN)*UartBase;
- if (mSerialBaseAddress == 0) {
- return RETURN_NOT_FOUND;
- }
- BaudRate = (UINTN)PcdGet64 (PcdUartDefaultBaudRate);
- ReceiveFifoDepth = 0; // Use the default value for Fifo depth
- Parity = (EFI_PARITY_TYPE)PcdGet8 (PcdUartDefaultParity);
- DataBits = PcdGet8 (PcdUartDefaultDataBits);
- StopBits = (EFI_STOP_BITS_TYPE) PcdGet8 (PcdUartDefaultStopBits);
- return PL011UartInitializePort (
- mSerialBaseAddress,
- FixedPcdGet32 (PL011UartClkInHz),
- &BaudRate,
- &ReceiveFifoDepth,
- &Parity,
- &DataBits,
- &StopBits
- );
- }
- /**
- Write data to serial device.
- @param Buffer Point of data buffer which need to be written.
- @param NumberOfBytes Number of output bytes which are cached in Buffer.
- @retval 0 Write data failed.
- @retval !0 Actual number of bytes written to serial device.
- **/
- UINTN
- EFIAPI
- SerialPortWrite (
- IN UINT8 *Buffer,
- IN UINTN NumberOfBytes
- )
- {
- if (mSerialBaseAddress != 0) {
- return PL011UartWrite (mSerialBaseAddress, Buffer, NumberOfBytes);
- }
- return 0;
- }
- /**
- Read data from serial device and save the data in buffer.
- @param Buffer Point of data buffer which need to be written.
- @param NumberOfBytes Number of output bytes which are cached in Buffer.
- @retval 0 Read data failed.
- @retval !0 Actual number of bytes read from serial device.
- **/
- UINTN
- EFIAPI
- SerialPortRead (
- OUT UINT8 *Buffer,
- IN UINTN NumberOfBytes
- )
- {
- if (mSerialBaseAddress != 0) {
- return PL011UartRead (mSerialBaseAddress, Buffer, NumberOfBytes);
- }
- return 0;
- }
- /**
- Check to see if any data is available to be read from the debug device.
- @retval TRUE At least one byte of data is available to be read
- @retval FALSE No data is available to be read
- **/
- BOOLEAN
- EFIAPI
- SerialPortPoll (
- VOID
- )
- {
- if (mSerialBaseAddress != 0) {
- return PL011UartPoll (mSerialBaseAddress);
- }
- return FALSE;
- }
- /**
- Sets the baud rate, receive FIFO depth, transmit/receive time out, parity,
- data bits, and stop bits on a serial device.
- @param BaudRate The requested baud rate. A BaudRate value of 0 will use the
- device's default interface speed.
- On output, the value actually set.
- @param ReceiveFifoDepth The requested depth of the FIFO on the receive side of the
- serial interface. A ReceiveFifoDepth value of 0 will use
- the device's default FIFO depth.
- On output, the value actually set.
- @param Timeout The requested time out for a single character in microseconds.
- This timeout applies to both the transmit and receive side of the
- interface. A Timeout value of 0 will use the device's default time
- out value.
- On output, the value actually set.
- @param Parity The type of parity to use on this serial device. A Parity value of
- DefaultParity will use the device's default parity value.
- On output, the value actually set.
- @param DataBits The number of data bits to use on the serial device. A DataBits
- value of 0 will use the device's default data bit setting.
- On output, the value actually set.
- @param StopBits The number of stop bits to use on this serial device. A StopBits
- value of DefaultStopBits will use the device's default number of
- stop bits.
- On output, the value actually set.
- @retval RETURN_SUCCESS The new attributes were set on the serial device.
- @retval RETURN_UNSUPPORTED The serial device does not support this operation.
- @retval RETURN_INVALID_PARAMETER One or more of the attributes has an unsupported value.
- @retval RETURN_DEVICE_ERROR The serial device is not functioning correctly.
- **/
- RETURN_STATUS
- EFIAPI
- SerialPortSetAttributes (
- IN OUT UINT64 *BaudRate,
- IN OUT UINT32 *ReceiveFifoDepth,
- IN OUT UINT32 *Timeout,
- IN OUT EFI_PARITY_TYPE *Parity,
- IN OUT UINT8 *DataBits,
- IN OUT EFI_STOP_BITS_TYPE *StopBits
- )
- {
- RETURN_STATUS Status;
- if (mSerialBaseAddress == 0) {
- Status = RETURN_UNSUPPORTED;
- } else {
- Status = PL011UartInitializePort (
- mSerialBaseAddress,
- FixedPcdGet32 (PL011UartClkInHz),
- BaudRate,
- ReceiveFifoDepth,
- Parity,
- DataBits,
- StopBits
- );
- }
- return Status;
- }
- /**
- Sets the control bits on a serial device.
- @param Control Sets the bits of Control that are settable.
- @retval RETURN_SUCCESS The new control bits were set on the serial device.
- @retval RETURN_UNSUPPORTED The serial device does not support this operation.
- @retval RETURN_DEVICE_ERROR The serial device is not functioning correctly.
- **/
- RETURN_STATUS
- EFIAPI
- SerialPortSetControl (
- IN UINT32 Control
- )
- {
- RETURN_STATUS Status;
- if (mSerialBaseAddress == 0) {
- Status = RETURN_UNSUPPORTED;
- } else {
- Status = PL011UartSetControl (mSerialBaseAddress, Control);
- }
- return Status;
- }
- /**
- Retrieve the status of the control bits on a serial device.
- @param Control A pointer to return the current control signals from the serial device.
- @retval RETURN_SUCCESS The control bits were read from the serial device.
- @retval RETURN_UNSUPPORTED The serial device does not support this operation.
- @retval RETURN_DEVICE_ERROR The serial device is not functioning correctly.
- **/
- RETURN_STATUS
- EFIAPI
- SerialPortGetControl (
- OUT UINT32 *Control
- )
- {
- RETURN_STATUS Status;
- if (mSerialBaseAddress == 0) {
- Status = RETURN_UNSUPPORTED;
- } else {
- Status = PL011UartGetControl (mSerialBaseAddress, Control);
- }
- return Status;
- }
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