FreeBSD/Linux Kernel Cross Reference
sys/dev/ic/ns16550.h

     /*-
      * Copyright (c) 1991 The Regents of the University of California.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      from: @(#)ns16550.h     7.1 (Berkeley) 5/9/91
     * $FreeBSD$
     */
    
    /*
     * NS8250... UART registers.
     */
    
    /* 8250 registers #[0-6]. */
    
    #define com_data        0       /* data register (R/W) */
    #define com_thr         com_data /* transmitter holding register (W) */
    #define com_rhr         com_data /* receiver holding register (R) */
    
    #define com_ier         1       /* interrupt enable register (W) */
    #define IER_ERXRDY      0x1
    #define IER_ETXRDY      0x2
    #define IER_ERLS        0x4
    #define IER_EMSC        0x8
    
    #define com_iir         2       /* interrupt identification register (R) */
    #define com_isr         com_iir /* interrupt status register (R) */
    #define IIR_IMASK       0xf
    #define IIR_RXTOUT      0xc
    #define IIR_RLS         0x6
    #define IIR_RXRDY       0x4
    #define IIR_TXRDY       0x2
    #define IIR_NOPEND      0x1
    #define IIR_MLSC        0x0
    #define IIR_FIFO_MASK   0xc0    /* set if FIFOs are enabled */
    
    #define com_lcr         3       /* line control register (R/W) */
    #define com_lctl        com_lcr
    #define com_cfcr        com_lcr /* character format control register (R/W) */
    #define LCR_DLAB        0x80
    #define CFCR_DLAB       LCR_DLAB
    #define LCR_EFR_ENABLE  0xbf    /* magic to enable EFR on 16650 up */
    #define CFCR_EFR_ENABLE LCR_EFR_ENABLE
    #define CFCR_SBREAK     0x40
    #define CFCR_PZERO      0x30
    #define CFCR_PONE       0x20
    #define CFCR_PEVEN      0x10
    #define CFCR_PODD       0x00
    #define CFCR_PENAB      0x08
    #define CFCR_STOPB      0x04
    #define CFCR_8BITS      0x03
    #define CFCR_7BITS      0x02
    #define CFCR_6BITS      0x01
    #define CFCR_5BITS      0x00
    
    #define com_mcr         4       /* modem control register (R/W) */
    #define MCR_PRESCALE    0x80    /* only available on 16650 up */
    #define MCR_LOOPBACK    0x10
    #define MCR_IENABLE     0x08
    #define MCR_DRS         0x04
    #define MCR_RTS         0x02
    #define MCR_DTR         0x01
    
    #define com_lsr         5       /* line status register (R/W) */
    #define LSR_RCV_FIFO    0x80
    #define LSR_TSRE        0x40
    #define LSR_TXRDY       0x20
    #define LSR_BI          0x10
    #define LSR_FE          0x08
    #define LSR_PE          0x04
    #define LSR_OE          0x02
    #define LSR_RXRDY       0x01
    #define LSR_RCV_MASK    0x1f
    
    #define com_msr         6       /* modem status register (R/W) */
    #define MSR_DCD         0x80
   #define MSR_RI          0x40
   #define MSR_DSR         0x20
   #define MSR_CTS         0x10
   #define MSR_DDCD        0x08
   #define MSR_TERI        0x04
   #define MSR_DDSR        0x02
   #define MSR_DCTS        0x01
   
   /* 8250 multiplexed registers #[0-1].  Access enabled by LCR[7]. */
   #define com_dll         0       /* divisor latch low (R/W) */
   #define com_dlbl        com_dll
   #define com_dlm         1       /* divisor latch high (R/W) */
   #define com_dlbh        com_dlm
   
   /* 16450 register #7.  Not multiplexed. */
   #define com_scr         7       /* scratch register (R/W) */
   
   /* 16550 register #2.  Not multiplexed. */
   #define com_fcr         2       /* FIFO control register (W) */
   #define com_fifo        com_fcr
   #define FIFO_ENABLE     0x01
   #define FIFO_RCV_RST    0x02
   #define FIFO_XMT_RST    0x04
   #define FIFO_DMA_MODE   0x08
   #define FIFO_RX_LOW     0x00
   #define FIFO_RX_MEDL    0x40
   #define FIFO_RX_MEDH    0x80
   #define FIFO_RX_HIGH    0xc0
   
   /* 16650 registers #2,[4-7].  Access enabled by LCR_EFR_ENABLE. */
   
   #define com_efr         2       /* enhanced features register (R/W) */
   #define EFR_AUTOCTS     0x80
   #define EFR_AUTORTS     0x40
   #define EFR_EFE         0x10    /* enhanced functions enable */
   
   #define com_xon1        4       /* XON 1 character (R/W) */
   #define com_xon2        5       /* XON 2 character (R/W) */
   #define com_xoff1       6       /* XOFF 1 character (R/W) */
   #define com_xoff2       7       /* XOFF 2 character (R/W) */
   
   /* 16950 register #1.  Access enabled by ACR[7].  Also requires !LCR[7]. */
   #define com_asr         1       /* additional status register (R[0-7]/W[0-1]) */
   
   /* 16950 register #3.  R/W access enabled by ACR[7]. */
   #define com_rfl         3       /* receiver fifo level (R) */
   
   /*
    * 16950 register #4.  Access enabled by ACR[7].  Also requires
    * !LCR_EFR_ENABLE.
    */
   #define com_tfl         4       /* transmitter fifo level (R) */
   
   /*
    * 16950 register #5.  Accessible if !LCR_EFR_ENABLE.  Read access also
    * requires ACR[6].
    */
   #define com_icr         5       /* index control register (R/W) */
   
   /*
    * 16950 register #7.  It is the same as com_scr except it has a different
    * abbreviation in the manufacturer's data sheet and it also serves as an
    * index into the Indexed Control register set.
    */
   #define com_spr         com_scr /* scratch pad (and index) register (R/W) */
   
   /*
    * 16950 indexed control registers #[0-0x13].  Access is via index in SPR,
    * data in ICR (if ICR is accessible).
    */
   
   #define com_acr         0       /* additional control register (R/W) */
   #define ACR_ASE         0x80    /* ASR/RFL/TFL enable */
   #define ACR_ICRE        0x40    /* ICR enable */
   #define ACR_TLE         0x20    /* TTL/RTL enable */
   
   #define com_cpr         1       /* clock prescaler register (R/W) */
   #define com_tcr         2       /* times clock register (R/W) */
   #define com_ttl         4       /* transmitter trigger level (R/W) */
   #define com_rtl         5       /* receiver trigger level (R/W) */
   /* ... */
   
   #ifdef PC98
   /* Hardware extension mode register for RSB-2000/3000. */
   #define com_emr         com_msr
   #define EMR_EXBUFF      0x04
   #define EMR_CTSFLW      0x08
   #define EMR_DSRFLW      0x10
   #define EMR_RTSFLW      0x20
   #define EMR_DTRFLW      0x40
   #define EMR_EFMODE      0x80
   #endif

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