ArmPlatformPkg/Include/Drivers/PL011Uart.h
/** @file
*
* Copyright (c) 2011-2012, ARM Limited. All rights reserved.
*
* 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.
*
**/
#ifndef __PL011_UART_H__
#define __PL011_UART_H__
#include <Uefi.h>
#include <Protocol/SerialIo.h>
// PL011 Registers
#define UARTDR 0x000
#define UARTRSR 0x004
#define UARTECR 0x004
#define UARTFR 0x018
#define UARTILPR 0x020
#define UARTIBRD 0x024
#define UARTFBRD 0x028
#define UARTLCR_H 0x02C
#define UARTCR 0x030
#define UARTIFLS 0x034
#define UARTIMSC 0x038
#define UARTRIS 0x03C
#define UARTMIS 0x040
#define UARTICR 0x044
#define UARTDMACR 0x048
// Data status bits
#define UART_DATA_ERROR_MASK 0x0F00
// Status reg bits
#define UART_STATUS_ERROR_MASK 0x0F
// Flag reg bits
#define PL011_UARTFR_RI (1 << 8) // Ring indicator
#define PL011_UARTFR_TXFE (1 << 7) // Transmit FIFO empty
#define PL011_UARTFR_RXFF (1 << 6) // Receive FIFO full
#define PL011_UARTFR_TXFF (1 << 5) // Transmit FIFO full
#define PL011_UARTFR_RXFE (1 << 4) // Receive FIFO empty
#define PL011_UARTFR_BUSY (1 << 3) // UART busy
#define PL011_UARTFR_DCD (1 << 2) // Data carrier detect
#define PL011_UARTFR_DSR (1 << 1) // Data set ready
#define PL011_UARTFR_CTS (1 << 0) // Clear to send
// Flag reg bits - alternative names
#define UART_TX_EMPTY_FLAG_MASK PL011_UARTFR_TXFE
#define UART_RX_FULL_FLAG_MASK PL011_UARTFR_RXFF
#define UART_TX_FULL_FLAG_MASK PL011_UARTFR_TXFF
#define UART_RX_EMPTY_FLAG_MASK PL011_UARTFR_RXFE
#define UART_BUSY_FLAG_MASK PL011_UARTFR_BUSY
// Control reg bits
#define PL011_UARTCR_CTSEN (1 << 15) // CTS hardware flow control enable
#define PL011_UARTCR_RTSEN (1 << 14) // RTS hardware flow control enable
#define PL011_UARTCR_RTS (1 << 11) // Request to send
#define PL011_UARTCR_DTR (1 << 10) // Data transmit ready.
#define PL011_UARTCR_RXE (1 << 9) // Receive enable
#define PL011_UARTCR_TXE (1 << 8) // Transmit enable
#define PL011_UARTCR_LBE (1 << 7) // Loopback enable
#define PL011_UARTCR_UARTEN (1 << 0) // UART Enable
// Line Control Register Bits
#define PL011_UARTLCR_H_SPS (1 << 7) // Stick parity select
#define PL011_UARTLCR_H_WLEN_8 (3 << 5)
#define PL011_UARTLCR_H_WLEN_7 (2 << 5)
#define PL011_UARTLCR_H_WLEN_6 (1 << 5)
#define PL011_UARTLCR_H_WLEN_5 (0 << 5)
#define PL011_UARTLCR_H_FEN (1 << 4) // FIFOs Enable
#define PL011_UARTLCR_H_STP2 (1 << 3) // Two stop bits select
#define PL011_UARTLCR_H_EPS (1 << 2) // Even parity select
#define PL011_UARTLCR_H_PEN (1 << 1) // Parity Enable
#define PL011_UARTLCR_H_BRK (1 << 0) // Send break
/*
Programmed hardware of Serial port.
@return Always return EFI_UNSUPPORTED.
**/
RETURN_STATUS
EFIAPI
PL011UartInitializePort (
IN OUT UINTN UartBase,
IN OUT UINT64 *BaudRate,
IN OUT UINT32 *ReceiveFifoDepth,
IN OUT EFI_PARITY_TYPE *Parity,
IN OUT UINT8 *DataBits,
IN OUT EFI_STOP_BITS_TYPE *StopBits
);
/**
Set the serial device control bits.
@param UartBase The base address of the PL011 UART.
@param Control Control bits which are to be set on the serial device.
@retval EFI_SUCCESS The new control bits were set on the serial device.
@retval EFI_UNSUPPORTED The serial device does not support this operation.
@retval EFI_DEVICE_ERROR The serial device is not functioning correctly.
**/
RETURN_STATUS
EFIAPI
PL011UartSetControl (
IN UINTN UartBase,
IN UINT32 Control
);
/**
Get the serial device control bits.
@param UartBase The base address of the PL011 UART.
@param Control Control signals read from the serial device.
@retval EFI_SUCCESS The control bits were read from the serial device.
@retval EFI_DEVICE_ERROR The serial device is not functioning correctly.
**/
RETURN_STATUS
EFIAPI
PL011UartGetControl (
IN UINTN UartBase,
OUT UINT32 *Control
);
/**
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
PL011UartWrite (
IN UINTN UartBase,
IN UINT8 *Buffer,
IN UINTN NumberOfBytes
);
/**
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
PL011UartRead (
IN UINTN UartBase,
OUT UINT8 *Buffer,
IN UINTN NumberOfBytes
);
/**
Check to see if any data is available to be read from the debug device.
@retval EFI_SUCCESS At least one byte of data is available to be read
@retval EFI_NOT_READY No data is available to be read
@retval EFI_DEVICE_ERROR The serial device is not functioning properly
**/
BOOLEAN
EFIAPI
PL011UartPoll (
IN UINTN UartBase
);
#endif