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cd653599c2
In preparation of creating different versions of DualSerialPortLib, split off the parts that will be shared between all versions. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@arm.com> Reviewed-by: Pete Batard <pete@akeo.ie> Tested-by: Pete Batard <pete@akeo.ie>
82 lines
2.4 KiB
C
82 lines
2.4 KiB
C
/** @file
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16550 and PL011 Serial Port library functions for Raspberry Pi
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Copyright (c) 2020, Pete Batard <pete@akeo.ie>
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Copyright (c) 2018, AMD Incorporated. All rights reserved.<BR>
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Copyright (c) 2014, Hewlett-Packard Development Company, L.P.<BR>
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Copyright (c) 2012 - 2016, ARM Ltd. All rights reserved.<BR>
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Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>
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Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Uefi/UefiBaseType.h>
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#include <IndustryStandard/Bcm2836.h>
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#include <IndustryStandard/Bcm2836Gpio.h>
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#define PL011_UART_REGISTER_BASE BCM2836_PL011_UART_BASE_ADDRESS
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#define MINI_UART_REGISTER_BASE (BCM2836_MINI_UART_BASE_ADDRESS + 0x40)
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//
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// 16550 UART register offsets and bitfields
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//
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#define R_UART_RXBUF 0 // LCR_DLAB = 0
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#define R_UART_TXBUF 0 // LCR_DLAB = 0
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#define R_UART_BAUD_LOW 0 // LCR_DLAB = 1
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#define R_UART_BAUD_HIGH 1 // LCR_DLAB = 1
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#define R_UART_IER 1 // LCR_DLAB = 0
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#define R_UART_FCR 2
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#define B_UART_FCR_FIFOE BIT0
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#define B_UART_FCR_FIFO64 BIT5
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#define R_UART_LCR 3
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#define B_UART_LCR_DLAB BIT7
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#define R_UART_MCR 4
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#define B_UART_MCR_DTRC BIT0
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#define B_UART_MCR_RTS BIT1
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#define R_UART_LSR 5
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#define B_UART_LSR_RXRDY BIT0
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#define B_UART_LSR_TXRDY BIT5
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#define B_UART_LSR_TEMT BIT6
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#define R_UART_MSR 6
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#define B_UART_MSR_CTS BIT4
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#define B_UART_MSR_DSR BIT5
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#define B_UART_MSR_RI BIT6
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#define B_UART_MSR_DCD BIT7
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extern BOOLEAN UsePl011Uart;
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extern BOOLEAN UsePl011UartSet;
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/**
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Read an 8-bit 16550 register.
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@param Base The base address register of UART device.
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@param Offset The offset of the 16550 register to read.
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@return The value read from the 16550 register.
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**/
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UINT8
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SerialPortReadRegister (
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UINTN Base,
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UINTN Offset
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);
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/**
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Write an 8-bit 16550 register.
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@param Base The base address register of UART device.
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@param Offset The offset of the 16550 register to write.
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@param Value The value to write to the 16550 register specified by Offset.
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@return The value written to the 16550 register.
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**/
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UINT8
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SerialPortWriteRegister (
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UINTN Base,
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UINTN Offset,
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UINT8 Value
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);
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