mirror of https://github.com/acidanthera/audk.git
138 lines
3.4 KiB
C
138 lines
3.4 KiB
C
/** @file
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Serial I/O Port library functions with no library constructor/destructor
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Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<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/SerialPortLib.h>
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#include <Library/PcdLib.h>
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#include <Library/IoLib.h>
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#include <ArmEb/ArmEb.h>
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/*
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Programmed hardware of Serial port.
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@return Always return EFI_UNSUPPORTED.
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**/
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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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UINT32 Base = PcdGet32 (PcdConsoleUartBase);
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// initialize baud rate generator to 115200 based on EB clock REFCLK24MHZ
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MmioWrite32 (Base + UARTIBRD, UART_115200_IDIV);
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MmioWrite32 (Base + UARTFBRD, UART_115200_FDIV);
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// no parity, 1 stop, no fifo, 8 data bits
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MmioWrite32 (Base + UARTLCR_H, 0x60);
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// clear any pending errors
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MmioWrite32 (Base + UARTECR, 0);
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// enable tx, rx, and uart overall
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MmioWrite32 (Base + UARTCR, 0x301);
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return RETURN_SUCCESS;
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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 writed.
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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 writed 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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UINT32 FR = PcdGet32 (PcdConsoleUartBase) + UARTFR;
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UINT32 DR = PcdGet32 (PcdConsoleUartBase) + UARTDR;
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UINTN Count;
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for (Count = 0; Count < NumberOfBytes; Count++, Buffer++) {
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while ((MmioRead32 (FR) & UART_TX_EMPTY_FLAG_MASK) != 0);
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MmioWrite8 (DR, *Buffer);
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}
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return NumberOfBytes;
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}
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/**
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Read data from serial device and save the datas in buffer.
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@param Buffer Point of data buffer which need to be writed.
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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 Aactual 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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UINT32 FR = PcdGet32 (PcdConsoleUartBase) + UARTFR;
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UINT32 DR = PcdGet32 (PcdConsoleUartBase) + UARTDR;
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UINTN Count;
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for (Count = 0; Count < NumberOfBytes; Count++, Buffer++) {
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while ((MmioRead32 (FR) & UART_RX_EMPTY_FLAG_MASK) == 0);
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*Buffer = MmioRead8 (DR);
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}
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return NumberOfBytes;
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}
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/**
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Check to see if any data is avaiable to be read from the debug device.
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@retval EFI_SUCCESS At least one byte of data is avaiable to be read
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@retval EFI_NOT_READY No data is avaiable to be read
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@retval EFI_DEVICE_ERROR The serial device is not functioning properly
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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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UINT32 FR = PcdGet32 (PcdConsoleUartBase) + UARTFR;
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if ((MmioRead32 (FR) & UART_RX_EMPTY_FLAG_MASK) == 0) {
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return TRUE;
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} else {
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return FALSE;
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}
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}
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