ns16550.h revision 158844
1/*- 2 * Copyright (c) 1991 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * from: @(#)ns16550.h 7.1 (Berkeley) 5/9/91 30 * $FreeBSD: head/sys/dev/ic/ns16550.h 158844 2006-05-23 00:41:12Z benno $ 31 */ 32 33/* 34 * NS8250... UART registers. 35 */ 36 37/* 8250 registers #[0-6]. */ 38 39#define com_data 0 /* data register (R/W) */ 40#define REG_DATA com_data 41 42#define com_ier 1 /* interrupt enable register (W) */ 43#define REG_IER com_ier 44#define IER_ERXRDY 0x1 45#define IER_ETXRDY 0x2 46#define IER_ERLS 0x4 47#define IER_EMSC 0x8 48 49#define com_iir 2 /* interrupt identification register (R) */ 50#define REG_IIR com_iir 51#define IIR_IMASK 0xf 52#define IIR_RXTOUT 0xc 53#define IIR_RLS 0x6 54#define IIR_RXRDY 0x4 55#define IIR_TXRDY 0x2 56#define IIR_NOPEND 0x1 57#define IIR_MLSC 0x0 58#define IIR_FIFO_MASK 0xc0 /* set if FIFOs are enabled */ 59 60#define com_lcr 3 /* line control register (R/W) */ 61#define com_cfcr com_lcr /* character format control register (R/W) */ 62#define REG_LCR com_lcr 63#define LCR_DLAB 0x80 64#define CFCR_DLAB LCR_DLAB 65#define LCR_EFR_ENABLE 0xbf /* magic to enable EFR on 16650 up */ 66#define CFCR_EFR_ENABLE LCR_EFR_ENABLE 67#define LCR_SBREAK 0x40 68#define CFCR_SBREAK LCR_SBREAK 69#define LCR_PZERO 0x30 70#define CFCR_PZERO LCR_PZERO 71#define LCR_PONE 0x20 72#define CFCR_PONE LCR_PONE 73#define LCR_PEVEN 0x10 74#define CFCR_PEVEN LCR_PEVEN 75#define LCR_PODD 0x00 76#define CFCR_PODD LCR_PODD 77#define LCR_PENAB 0x08 78#define CFCR_PENAB LCR_PENAB 79#define LCR_STOPB 0x04 80#define CFCR_STOPB LCR_STOPB 81#define LCR_8BITS 0x03 82#define CFCR_8BITS LCR_8BITS 83#define LCR_7BITS 0x02 84#define CFCR_7BITS LCR_7BITS 85#define LCR_6BITS 0x01 86#define CFCR_6BITS LCR_6BITS 87#define LCR_5BITS 0x00 88#define CFCR_5BITS LCR_5BITS 89 90#define com_mcr 4 /* modem control register (R/W) */ 91#define REG_MCR com_mcr 92#define MCR_PRESCALE 0x80 /* only available on 16650 up */ 93#define MCR_LOOPBACK 0x10 94#define MCR_IE 0x08 95#define MCR_IENABLE MCR_IE 96#define MCR_DRS 0x04 97#define MCR_RTS 0x02 98#define MCR_DTR 0x01 99 100#define com_lsr 5 /* line status register (R/W) */ 101#define REG_LSR com_lsr 102#define LSR_RCV_FIFO 0x80 103#define LSR_TEMT 0x40 104#define LSR_TSRE LSR_TEMT 105#define LSR_THRE 0x20 106#define LSR_TXRDY LSR_THRE 107#define LSR_BI 0x10 108#define LSR_FE 0x08 109#define LSR_PE 0x04 110#define LSR_OE 0x02 111#define LSR_RXRDY 0x01 112#define LSR_RCV_MASK 0x1f 113 114#define com_msr 6 /* modem status register (R/W) */ 115#define REG_MSR com_msr 116#define MSR_DCD 0x80 117#define MSR_RI 0x40 118#define MSR_DSR 0x20 119#define MSR_CTS 0x10 120#define MSR_DDCD 0x08 121#define MSR_TERI 0x04 122#define MSR_DDSR 0x02 123#define MSR_DCTS 0x01 124 125/* 8250 multiplexed registers #[0-1]. Access enabled by LCR[7]. */ 126#define com_dll 0 /* divisor latch low (R/W) */ 127#define com_dlbl com_dll 128#define com_dlm 1 /* divisor latch high (R/W) */ 129#define com_dlbh com_dlm 130#define REG_DLL com_dll 131#define REG_DLH com_dlm 132 133/* 16450 register #7. Not multiplexed. */ 134#define com_scr 7 /* scratch register (R/W) */ 135 136/* 16550 register #2. Not multiplexed. */ 137#define com_fcr 2 /* FIFO control register (W) */ 138#define com_fifo com_fcr 139#define REG_FCR com_fcr 140#define FCR_ENABLE 0x01 141#define FIFO_ENABLE FCR_ENABLE 142#define FCR_RCV_RST 0x02 143#define FIFO_RCV_RST FCR_RCV_RST 144#define FCR_XMT_RST 0x04 145#define FIFO_XMT_RST FCR_XMT_RST 146#define FCR_DMA 0x08 147#define FIFO_DMA_MODE FCR_DMA 148#define FCR_RX_LOW 0x00 149#define FIFO_RX_LOW FCR_RX_LOW 150#define FCR_RX_MEDL 0x40 151#define FIFO_RX_MEDL FCR_RX_MEDL 152#define FCR_RX_MEDH 0x80 153#define FIFO_RX_MEDH FCR_RX_MEDH 154#define FCR_RX_HIGH 0xc0 155#define FIFO_RX_HIGH FCR_RX_HIGH 156 157/* 16650 registers #2,[4-7]. Access enabled by LCR_EFR_ENABLE. */ 158 159#define com_efr 2 /* enhanced features register (R/W) */ 160#define REG_EFR com_efr 161#define EFR_CTS 0x80 162#define EFR_AUTOCTS EFR_CTS 163#define EFR_RTS 0x40 164#define EFR_AUTORTS EFR_RTS 165#define EFR_EFE 0x10 /* enhanced functions enable */ 166 167#define com_xon1 4 /* XON 1 character (R/W) */ 168#define com_xon2 5 /* XON 2 character (R/W) */ 169#define com_xoff1 6 /* XOFF 1 character (R/W) */ 170#define com_xoff2 7 /* XOFF 2 character (R/W) */ 171 172/* 16950 register #1. Access enabled by ACR[7]. Also requires !LCR[7]. */ 173#define com_asr 1 /* additional status register (R[0-7]/W[0-1]) */ 174 175/* 16950 register #3. R/W access enabled by ACR[7]. */ 176#define com_rfl 3 /* receiver fifo level (R) */ 177 178/* 179 * 16950 register #4. Access enabled by ACR[7]. Also requires 180 * !LCR_EFR_ENABLE. 181 */ 182#define com_tfl 4 /* transmitter fifo level (R) */ 183 184/* 185 * 16950 register #5. Accessible if !LCR_EFR_ENABLE. Read access also 186 * requires ACR[6]. 187 */ 188#define com_icr 5 /* index control register (R/W) */ 189 190/* 191 * 16950 register #7. It is the same as com_scr except it has a different 192 * abbreviation in the manufacturer's data sheet and it also serves as an 193 * index into the Indexed Control register set. 194 */ 195#define com_spr com_scr /* scratch pad (and index) register (R/W) */ 196#define REG_SPR com_scr 197 198/* 199 * 16950 indexed control registers #[0-0x13]. Access is via index in SPR, 200 * data in ICR (if ICR is accessible). 201 */ 202 203#define com_acr 0 /* additional control register (R/W) */ 204#define ACR_ASE 0x80 /* ASR/RFL/TFL enable */ 205#define ACR_ICRE 0x40 /* ICR enable */ 206#define ACR_TLE 0x20 /* TTL/RTL enable */ 207 208#define com_cpr 1 /* clock prescaler register (R/W) */ 209#define com_tcr 2 /* times clock register (R/W) */ 210#define com_ttl 4 /* transmitter trigger level (R/W) */ 211#define com_rtl 5 /* receiver trigger level (R/W) */ 212/* ... */ 213 214#ifdef PC98 215/* Hardware extension mode register for RSB-2000/3000. */ 216#define com_emr com_msr 217#define EMR_EXBUFF 0x04 218#define EMR_CTSFLW 0x08 219#define EMR_DSRFLW 0x10 220#define EMR_RTSFLW 0x20 221#define EMR_DTRFLW 0x40 222#define EMR_EFMODE 0x80 223#endif 224