Upload BSD-licensed Vlv2TbltDevicePkg and Vlv2DeviceRefCodePkg to
https://svn.code.sf.net/p/edk2/code/trunk/edk2/, which are for MinnowBoard MAX open source project. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: David Wei <david.wei@intel.com> Reviewed-by: Mike Wu <mike.wu@intel.com> Reviewed-by: Hot Tian <hot.tian@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16599 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
David Wei
zwei4
262
Vlv2TbltDevicePkg/Library/SerialPortLib/SerialPortLib.c
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262
Vlv2TbltDevicePkg/Library/SerialPortLib/SerialPortLib.c
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/** @file
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Serial I/O Port library functions with no library constructor/destructor
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Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials are licensed and made available under
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the terms and conditions of the BSD License that accompanies this distribution.
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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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This software and associated documentation
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(if any) is furnished under a license and may only be used or
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copied in accordance with the terms of the license. Except as
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permitted by such license, no part of this software or
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documentation may be reproduced, stored in a retrieval system, or
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transmitted in any form or by any means without the express written
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consent of Intel Corporation.
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Module Name: SerialPortLib.c
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**/
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#include "PlatformSerialPortLib.h"
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UINT16 gComBase = 0x3f8;
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UINTN gBps = 115200;
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UINT8 gData = 8;
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UINT8 gStop = 1;
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UINT8 gParity = 0;
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UINT8 gBreakSet = 0;
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/**
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Initialize Serial Port
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The Baud Rate Divisor registers are programmed and the LCR
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is used to configure the communications format. Hard coded
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UART config comes from globals in DebugSerialPlatform lib.
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@param None
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@retval None
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**/
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RETURN_STATUS
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EFIAPI
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UARTInitialize (
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VOID
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)
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{
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UINTN Divisor;
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UINT8 OutputData;
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UINT8 Data;
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//
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// Map 5..8 to 0..3
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//
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Data = (UINT8) (gData - (UINT8) 5);
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//
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// Calculate divisor for baud generator
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//
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Divisor = 115200 / gBps;
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//
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// Set communications format
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//
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OutputData = (UINT8) ((DLAB << 7) | ((gBreakSet << 6) | ((gParity << 3) | ((gStop << 2) | Data))));
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IoWrite8 (gComBase + LCR_OFFSET, OutputData);
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//
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// Configure baud rate
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//
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IoWrite8 (gComBase + BAUD_HIGH_OFFSET, (UINT8) (Divisor >> 8));
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IoWrite8 (gComBase + BAUD_LOW_OFFSET, (UINT8) (Divisor & 0xff));
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//
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// Switch back to bank 0
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//
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OutputData = (UINT8) ((~DLAB << 7) | ((gBreakSet << 6) | ((gParity << 3) | ((gStop << 2) | Data))));
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IoWrite8 (gComBase + LCR_OFFSET, OutputData);
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return RETURN_SUCCESS;
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}
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/**
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Common function to initialize UART Serial device and USB Serial device.
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@param None
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@retval None
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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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UARTInitialize ();
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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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If the buffer is NULL, then return 0;
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if NumberOfBytes is zero, then return 0.
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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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UARTDbgOut (
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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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UINTN Result;
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UINT8 Data;
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if (NULL == Buffer) {
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return 0;
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}
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Result = NumberOfBytes;
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while (NumberOfBytes--) {
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//
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// Wait for the serial port to be ready.
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//
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do {
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Data = IoRead8 ((UINT16) PcdGet64 (PcdSerialRegisterBase) + LSR_OFFSET);
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} while ((Data & LSR_TXRDY) == 0);
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IoWrite8 ((UINT16) PcdGet64 (PcdSerialRegisterBase), *Buffer++);
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}
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return Result;
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}
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/**
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Common function to write data to UART Serial device and USB 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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**/
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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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if (FeaturePcdGet (PcdStatusCodeUseIsaSerial)) {
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UARTDbgOut (Buffer, NumberOfBytes);
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}
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return RETURN_SUCCESS;
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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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If the buffer is NULL, then return 0;
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if NumberOfBytes is zero, then return 0.
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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 Actual number of bytes raed to serial device.
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**/
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UINTN
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EFIAPI
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UARTDbgIn (
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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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UINTN Result;
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UINT8 Data;
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if (NULL == Buffer) {
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return 0;
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}
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Result = NumberOfBytes;
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while (NumberOfBytes--) {
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//
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// Wait for the serial port to be ready.
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//
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do {
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Data = IoRead8 ((UINT16) PcdGet64 (PcdSerialRegisterBase) + LSR_OFFSET);
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} while ((Data & LSR_RXDA) == 0);
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*Buffer++ = IoRead8 ((UINT16) PcdGet64 (PcdSerialRegisterBase));
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}
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return Result;
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}
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/**
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Common function to Read data from UART serial device, USB 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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**/
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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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if (FeaturePcdGet (PcdStatusCodeUseIsaSerial)) {
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UARTDbgIn (Buffer, NumberOfBytes);
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}
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return RETURN_SUCCESS;
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}
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/**
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Polls a serial device to see if there is any data waiting to be read.
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Polls aserial device to see if there is any data waiting to be read.
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If there is data waiting to be read from the serial device, then TRUE is returned.
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If there is no data waiting to be read from the serial device, then FALSE is returned.
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@retval TRUE Data is waiting to be read from the serial device.
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@retval FALSE There is no data waiting to be read from the serial device.
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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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