mirror of https://github.com/acidanthera/audk.git
138 lines
3.5 KiB
C
138 lines
3.5 KiB
C
/** @file
|
|
Serial I/O Port library functions with no library constructor/destructor
|
|
|
|
|
|
Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>
|
|
|
|
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.
|
|
|
|
**/
|
|
|
|
#include <Include/Uefi.h>
|
|
|
|
#include <Library/IoLib.h>
|
|
|
|
#include <Drivers/PL011Uart.h>
|
|
|
|
/*
|
|
|
|
Programmed hardware of Serial port.
|
|
|
|
@return Always return EFI_UNSUPPORTED.
|
|
|
|
**/
|
|
RETURN_STATUS
|
|
EFIAPI
|
|
PL011UartInitialize (
|
|
IN UINTN UartBase,
|
|
IN UINTN BaudRate,
|
|
IN UINTN LineControl
|
|
)
|
|
{
|
|
if (BaudRate == 115200) {
|
|
// Initialize baud rate generator
|
|
MmioWrite32 (UartBase + UARTIBRD, UART_115200_IDIV);
|
|
MmioWrite32 (UartBase + UARTFBRD, UART_115200_FDIV);
|
|
} else if (BaudRate == 38400) {
|
|
// Initialize baud rate generator
|
|
MmioWrite32 (UartBase + UARTIBRD, UART_38400_IDIV);
|
|
MmioWrite32 (UartBase + UARTFBRD, UART_38400_FDIV);
|
|
} else if (BaudRate == 19200) {
|
|
// Initialize baud rate generator
|
|
MmioWrite32 (UartBase + UARTIBRD, UART_19200_IDIV);
|
|
MmioWrite32 (UartBase + UARTFBRD, UART_19200_FDIV);
|
|
} else {
|
|
return EFI_INVALID_PARAMETER;
|
|
}
|
|
|
|
// No parity, 1 stop, no fifo, 8 data bits
|
|
MmioWrite32 (UartBase + UARTLCR_H, LineControl);
|
|
|
|
// Clear any pending errors
|
|
MmioWrite32 (UartBase + UARTECR, 0);
|
|
|
|
// Enable tx, rx, and uart overall
|
|
MmioWrite32 (UartBase + UARTCR, PL011_UARTCR_RXE | PL011_UARTCR_TXE | PL011_UARTCR_UARTEN);
|
|
|
|
return EFI_SUCCESS;
|
|
}
|
|
|
|
/**
|
|
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
|
|
)
|
|
{
|
|
UINTN Count;
|
|
|
|
for (Count = 0; Count < NumberOfBytes; Count++, Buffer++) {
|
|
while ((MmioRead32 (UartBase + UARTFR) & UART_TX_EMPTY_FLAG_MASK) == 0);
|
|
MmioWrite8 (UartBase + UARTDR, *Buffer);
|
|
}
|
|
|
|
return 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
|
|
)
|
|
{
|
|
UINTN Count;
|
|
|
|
for (Count = 0; Count < NumberOfBytes; Count++, Buffer++) {
|
|
while ((MmioRead32 (UartBase + UARTFR) & UART_RX_EMPTY_FLAG_MASK) != 0);
|
|
*Buffer = MmioRead8 (UartBase + UARTDR);
|
|
}
|
|
|
|
return 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
|
|
)
|
|
{
|
|
return ((MmioRead32 (UartBase + UARTFR) & UART_RX_EMPTY_FLAG_MASK) == 0);
|
|
}
|