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git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10332 6f19259b-4bc3-4df7-8a09-765794883524
125 lines
3.2 KiB
C
125 lines
3.2 KiB
C
/** @file
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Serial I/O Port library functions with no library constructor/destructor
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Copyright (c) 2008-2009, Apple Inc. All rights reserved.
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All rights reserved. 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/DebugLib.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 <Library/OmapLib.h>
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#include <Omap3530/Omap3530.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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// assume assembly code at reset vector has setup UART
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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 LSR = UartBase(PcdGet32(PcdOmap35xxConsoleUart)) + UART_LSR_REG;
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UINT32 THR = UartBase(PcdGet32(PcdOmap35xxConsoleUart)) + UART_THR_REG;
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UINTN Count;
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for (Count = 0; Count < NumberOfBytes; Count++, Buffer++) {
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while ((MmioRead8(LSR) & UART_LSR_TX_FIFO_E_MASK) == UART_LSR_TX_FIFO_E_NOT_EMPTY);
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MmioWrite8(THR, *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 LSR = UartBase(PcdGet32(PcdOmap35xxConsoleUart)) + UART_LSR_REG;
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UINT32 RBR = UartBase(PcdGet32(PcdOmap35xxConsoleUart)) + UART_RBR_REG;
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UINTN Count;
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for (Count = 0; Count < NumberOfBytes; Count++, Buffer++) {
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while ((MmioRead8(LSR) & UART_LSR_RX_FIFO_E_MASK) == UART_LSR_RX_FIFO_E_EMPTY);
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*Buffer = MmioRead8(RBR);
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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 LSR = UartBase(PcdGet32(PcdOmap35xxConsoleUart)) + UART_LSR_REG;
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if ((MmioRead8(LSR) & UART_LSR_RX_FIFO_E_MASK) == UART_LSR_RX_FIFO_E_NOT_EMPTY) {
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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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