154 lines
4.9 KiB
C
154 lines
4.9 KiB
C
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/*
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* Copyright (c) 2003 Marcel Moolenaar
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _DEV_UART_DEV_I8251_H_
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#define _DEV_UART_DEV_I8251_H_
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/* Enhanced Feature Register. */
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#define EFR_CTS 0x80
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#define EFR_RTS 0x40
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#define EFR_SCD 0x20 /* Special Character Detect. */
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#define EFR_EFC 0x10 /* Enhanced Function Control. */
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#define EFR_SFC_MASK 0x0f /* Software Flow Control. */
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#define EFR_SFC_TX12 0x0c /* BIT: Transmit XON1+2/XOFF1+2. */
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#define EFR_SFC_TX1 0x08 /* BIT: Transmit XON1/XOFF1. */
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#define EFR_SFC_TX2 0x04 /* BIT: Transmit XON2/XOFF2. */
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#define EFR_SFC_RX1 0x02 /* BIT: Receive XON1/XOFF1. */
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#define EFR_SFC_RX2 0x01 /* BIT: Receive XON2/XOFF2. */
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#define EFR_SFC_T12R12 0x0f /* VAL: TX 1+2, RX 1+2. */
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#define EFR_SFC_T1R12 0x0b /* VAL: TX 1, RX 1+2. */
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#define EFR_SFC_T2R12 0x07 /* VAL: TX 2, RX 1+2. */
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/* FIFO Control Register. */
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#define FCR_RX_HIGH 0xc0
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#define FCR_RX_MEDH 0x80
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#define FCR_RX_MEDL 0x40
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#define FCR_RX_LOW 0x00
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#define FCR_TX_HIGH 0x30
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#define FCR_TX_MEDH 0x20
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#define FCR_TX_LOW 0x10
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#define FCR_TX_MEDL 0x00
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#define FCR_DMA 0x08
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#define FCR_XMT_RST 0x04
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#define FCR_RCV_RST 0x02
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#define FCR_ENABLE 0x01
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/* Interrupt Enable Register. */
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#define IER_CTS 0x80
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#define IER_RTS 0x40
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#define IER_XOFF 0x20
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#define IER_SLEEP 0x10
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#define IER_EMSC 0x08
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#define IER_ERLS 0x04
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#define IER_ETXRDY 0x02
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#define IER_ERXRDY 0x01
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/* Interrupt Identification Register. */
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#define IIR_FIFO_MASK 0xc0
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#define IIR_RTSCTS 0x20
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#define IIR_XOFF 0x10
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#define IIR_IMASK 0x0f
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#define IIR_RXTOUT 0x0c
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#define IIR_RLS 0x06
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#define IIR_RXRDY 0x04
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#define IIR_TXRDY 0x02
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#define IIR_MLSC 0x00
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#define IIR_NOPEND 0x01
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/* Line Control Register. */
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#define LCR_DLAB 0x80
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#define LCR_SBREAK 0x40
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#define LCR_PZERO 0x30
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#define LCR_PONE 0x20
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#define LCR_PEVEN 0x10
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#define LCR_PODD 0x00
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#define LCR_PENAB 0x08
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#define LCR_STOPB 0x04
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#define LCR_8BITS 0x03
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#define LCR_7BITS 0x02
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#define LCR_6BITS 0x01
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#define LCR_5BITS 0x00
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/* Line Status Register. */
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#define LSR_DERR 0x80
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#define LSR_TEMT 0x40 /* Transmitter Empty. */
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#define LSR_THRE 0x20 /* Transmitter Holding Register Empty. */
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#define LSR_BI 0x10
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#define LSR_FE 0x08
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#define LSR_PE 0x04
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#define LSR_OE 0x02
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#define LSR_RXRDY 0x01
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/* Modem Control Register. */
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#define MCR_CS 0x80
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#define MCR_IRE 0x40
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#define MCR_ISEL 0x20
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#define MCR_LOOPBACK 0x10
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#define MCR_IE 0x08
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#define MCR_LBDCD MCR_IE
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#define MCR_LBRI 0x04
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#define MCR_RTS 0x02
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#define MCR_DTR 0x01
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/* Modem Status Register. */
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#define MSR_DCD 0x80
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#define MSR_RI 0x40
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#define MSR_DSR 0x20
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#define MSR_CTS 0x10
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#define MSR_DDCD 0x08
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#define MSR_TERI 0x04
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#define MSR_DDSR 0x02
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#define MSR_DCTS 0x01
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/* General registers. */
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#define REG_DATA 0 /* Data Register. */
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#define REG_RBR REG_DATA /* Receiver Buffer Register (R). */
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#define REG_THR REG_DATA /* Transmitter Holding Register (W). */
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#define REG_IER 1 /* Interrupt Enable Register */
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#define REG_IIR 2 /* Interrupt Ident. Register (R). */
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#define REG_FCR 2 /* FIFO Control Register (W). */
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#define REG_LCR 3 /* Line Control Register. */
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#define REG_MCR 4 /* Modem Control Register. */
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#define REG_LSR 5 /* Line Status Register. */
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#define REG_MSR 6 /* Modem Status Register. */
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#define REG_SPR 7 /* Scratch Pad Register. */
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/* Baudrate registers (LCR[7] = 1). */
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#define REG_DLBL 0 /* Divisor Latch (LSB). */
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#define REG_DLBH 1 /* Divisor Latch (MSB). */
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#define REG_DL REG_DLBL /* Divisor Latch (16-bit I/O). */
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/* Enhanced registers (LCR = 0xBF). */
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#define REG_EFR 2 /* Enhanced Feature Register. */
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#define REG_XON1 4 /* XON character 1. */
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#define REG_XON2 5 /* XON character 2. */
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#define REG_XOFF1 6 /* XOFF character 1. */
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#define REG_XOFF2 7 /* XOFF character 2. */
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#endif /* _DEV_UART_DEV_I8251_H_ */
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