mirror of https://github.com/acidanthera/audk.git
161 lines
3.8 KiB
C
161 lines
3.8 KiB
C
/** @file
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Serial I/O Port library functions with no library constructor/destructor
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Copyright (c) 2006, Intel Corporation
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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/IoLib.h>
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#include <Library/SerialPortLib.h>
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//---------------------------------------------
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// UART Register Offsets
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//---------------------------------------------
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#define BAUD_LOW_OFFSET 0x00
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#define BAUD_HIGH_OFFSET 0x01
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#define IER_OFFSET 0x01
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#define LCR_SHADOW_OFFSET 0x01
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#define FCR_SHADOW_OFFSET 0x02
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#define IR_CONTROL_OFFSET 0x02
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#define FCR_OFFSET 0x02
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#define EIR_OFFSET 0x02
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#define BSR_OFFSET 0x03
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#define LCR_OFFSET 0x03
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#define MCR_OFFSET 0x04
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#define LSR_OFFSET 0x05
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#define MSR_OFFSET 0x06
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//---------------------------------------------
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// UART Register Bit Defines
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//---------------------------------------------
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#define LSR_TXRDY 0x20
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#define LSR_RXDA 0x01
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#define DLAB 0x01
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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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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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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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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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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 serail port to be ready.
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//
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do {
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Data = IoRead8 (gComBase + LSR_OFFSET);
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} while ((Data & LSR_TXRDY) == 0);
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IoWrite8 (gComBase, *Buffer++);
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}
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return Result;
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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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return 0;
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}
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