The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    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: releng/9.0/sys/dev/ic/ns16550.h 202062 2010-01-11 04:13:06Z imp $
   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 IER_BITS        "\2\1ERXRDY\2ETXRDY\3ERLS\4EMSC"
   50 
   51 #define com_iir         2       /* interrupt identification register (R) */
   52 #define REG_IIR         com_iir
   53 #define IIR_IMASK       0xf
   54 #define IIR_RXTOUT      0xc
   55 #define IIR_BUSY        0x7
   56 #define IIR_RLS         0x6
   57 #define IIR_RXRDY       0x4
   58 #define IIR_TXRDY       0x2
   59 #define IIR_NOPEND      0x1
   60 #define IIR_MLSC        0x0
   61 #define IIR_FIFO_MASK   0xc0    /* set if FIFOs are enabled */
   62 
   63 #define IIR_BITS        "\2\1NOPEND\2TXRDY\3RXRDY"
   64 
   65 #define com_lcr         3       /* line control register (R/W) */
   66 #define com_cfcr        com_lcr /* character format control register (R/W) */
   67 #define REG_LCR         com_lcr
   68 #define LCR_DLAB        0x80
   69 #define CFCR_DLAB       LCR_DLAB
   70 #define LCR_EFR_ENABLE  0xbf    /* magic to enable EFR on 16650 up */
   71 #define CFCR_EFR_ENABLE LCR_EFR_ENABLE
   72 #define LCR_SBREAK      0x40
   73 #define CFCR_SBREAK     LCR_SBREAK
   74 #define LCR_PZERO       0x30
   75 #define CFCR_PZERO      LCR_PZERO
   76 #define LCR_PONE        0x20
   77 #define CFCR_PONE       LCR_PONE
   78 #define LCR_PEVEN       0x10
   79 #define CFCR_PEVEN      LCR_PEVEN
   80 #define LCR_PODD        0x00
   81 #define CFCR_PODD       LCR_PODD
   82 #define LCR_PENAB       0x08
   83 #define CFCR_PENAB      LCR_PENAB
   84 #define LCR_STOPB       0x04
   85 #define CFCR_STOPB      LCR_STOPB
   86 #define LCR_8BITS       0x03
   87 #define CFCR_8BITS      LCR_8BITS
   88 #define LCR_7BITS       0x02
   89 #define CFCR_7BITS      LCR_7BITS
   90 #define LCR_6BITS       0x01
   91 #define CFCR_6BITS      LCR_6BITS
   92 #define LCR_5BITS       0x00
   93 #define CFCR_5BITS      LCR_5BITS
   94 
   95 #define com_mcr         4       /* modem control register (R/W) */
   96 #define REG_MCR         com_mcr
   97 #define MCR_PRESCALE    0x80    /* only available on 16650 up */
   98 #define MCR_LOOPBACK    0x10
   99 #define MCR_IE          0x08
  100 #define MCR_IENABLE     MCR_IE
  101 #define MCR_DRS         0x04
  102 #define MCR_RTS         0x02
  103 #define MCR_DTR         0x01
  104 
  105 #define MCR_BITS        "\2\1DTR\2RTS\3DRS\4IE\5LOOPBACK\10PRESCALE"
  106 
  107 #define com_lsr         5       /* line status register (R/W) */
  108 #define REG_LSR         com_lsr
  109 #define LSR_RCV_FIFO    0x80
  110 #define LSR_TEMT        0x40
  111 #define LSR_TSRE        LSR_TEMT
  112 #define LSR_THRE        0x20
  113 #define LSR_TXRDY       LSR_THRE
  114 #define LSR_BI          0x10
  115 #define LSR_FE          0x08
  116 #define LSR_PE          0x04
  117 #define LSR_OE          0x02
  118 #define LSR_RXRDY       0x01
  119 #define LSR_RCV_MASK    0x1f
  120 
  121 #define LSR_BITS        "\2\1RXRDY\2OE\3PE\4FE\5BI\6THRE\7TEMT\10RCV_FIFO"
  122 
  123 #define com_msr         6       /* modem status register (R/W) */
  124 #define REG_MSR         com_msr
  125 #define MSR_DCD         0x80
  126 #define MSR_RI          0x40
  127 #define MSR_DSR         0x20
  128 #define MSR_CTS         0x10
  129 #define MSR_DDCD        0x08
  130 #define MSR_TERI        0x04
  131 #define MSR_DDSR        0x02
  132 #define MSR_DCTS        0x01
  133 
  134 #define MSR_BITS        "\2\1DCTS\2DDSR\3TERI\4DDCD\5CTS\6DSR\7RI\10DCD"
  135 
  136 /* 8250 multiplexed registers #[0-1].  Access enabled by LCR[7]. */
  137 #define com_dll         0       /* divisor latch low (R/W) */
  138 #define com_dlbl        com_dll
  139 #define com_dlm         1       /* divisor latch high (R/W) */
  140 #define com_dlbh        com_dlm
  141 #define REG_DLL         com_dll
  142 #define REG_DLH         com_dlm
  143 
  144 /* 16450 register #7.  Not multiplexed. */
  145 #define com_scr         7       /* scratch register (R/W) */
  146 
  147 /* 16550 register #2.  Not multiplexed. */
  148 #define com_fcr         2       /* FIFO control register (W) */
  149 #define com_fifo        com_fcr
  150 #define REG_FCR         com_fcr
  151 #define FCR_ENABLE      0x01
  152 #define FIFO_ENABLE     FCR_ENABLE
  153 #define FCR_RCV_RST     0x02
  154 #define FIFO_RCV_RST    FCR_RCV_RST
  155 #define FCR_XMT_RST     0x04
  156 #define FIFO_XMT_RST    FCR_XMT_RST
  157 #define FCR_DMA         0x08
  158 #define FIFO_DMA_MODE   FCR_DMA
  159 #define FCR_RX_LOW      0x00
  160 #define FIFO_RX_LOW     FCR_RX_LOW
  161 #define FCR_RX_MEDL     0x40
  162 #define FIFO_RX_MEDL    FCR_RX_MEDL
  163 #define FCR_RX_MEDH     0x80
  164 #define FIFO_RX_MEDH    FCR_RX_MEDH
  165 #define FCR_RX_HIGH     0xc0
  166 #define FIFO_RX_HIGH    FCR_RX_HIGH
  167 
  168 #define FCR_BITS        "\2\1ENABLE\2RCV_RST\3XMT_RST\4DMA"
  169 
  170 /* 16650 registers #2,[4-7].  Access enabled by LCR_EFR_ENABLE. */
  171 
  172 #define com_efr         2       /* enhanced features register (R/W) */
  173 #define REG_EFR         com_efr
  174 #define EFR_CTS         0x80
  175 #define EFR_AUTOCTS     EFR_CTS
  176 #define EFR_RTS         0x40
  177 #define EFR_AUTORTS     EFR_RTS
  178 #define EFR_EFE         0x10    /* enhanced functions enable */
  179 
  180 #define com_xon1        4       /* XON 1 character (R/W) */
  181 #define com_xon2        5       /* XON 2 character (R/W) */
  182 #define com_xoff1       6       /* XOFF 1 character (R/W) */
  183 #define com_xoff2       7       /* XOFF 2 character (R/W) */
  184 
  185 #define com_usr         39      /* Octeon 16750/16550 Uart Status Reg */
  186 #define REG_USR         com_usr
  187 #define USR_TXFIFO_NOTFULL 2    /* Uart TX FIFO Not full */
  188 
  189 /* 16950 register #1.  Access enabled by ACR[7].  Also requires !LCR[7]. */
  190 #define com_asr         1       /* additional status register (R[0-7]/W[0-1]) */
  191 
  192 /* 16950 register #3.  R/W access enabled by ACR[7]. */
  193 #define com_rfl         3       /* receiver fifo level (R) */
  194 
  195 /*
  196  * 16950 register #4.  Access enabled by ACR[7].  Also requires
  197  * !LCR_EFR_ENABLE.
  198  */
  199 #define com_tfl         4       /* transmitter fifo level (R) */
  200 
  201 /*
  202  * 16950 register #5.  Accessible if !LCR_EFR_ENABLE.  Read access also
  203  * requires ACR[6].
  204  */
  205 #define com_icr         5       /* index control register (R/W) */
  206 
  207 /*
  208  * 16950 register #7.  It is the same as com_scr except it has a different
  209  * abbreviation in the manufacturer's data sheet and it also serves as an
  210  * index into the Indexed Control register set.
  211  */
  212 #define com_spr         com_scr /* scratch pad (and index) register (R/W) */
  213 #define REG_SPR         com_scr
  214 
  215 /*
  216  * 16950 indexed control registers #[0-0x13].  Access is via index in SPR,
  217  * data in ICR (if ICR is accessible).
  218  */
  219 
  220 #define com_acr         0       /* additional control register (R/W) */
  221 #define ACR_ASE         0x80    /* ASR/RFL/TFL enable */
  222 #define ACR_ICRE        0x40    /* ICR enable */
  223 #define ACR_TLE         0x20    /* TTL/RTL enable */
  224 
  225 #define com_cpr         1       /* clock prescaler register (R/W) */
  226 #define com_tcr         2       /* times clock register (R/W) */
  227 #define com_ttl         4       /* transmitter trigger level (R/W) */
  228 #define com_rtl         5       /* receiver trigger level (R/W) */
  229 /* ... */
  230 
  231 /* Hardware extension mode register for RSB-2000/3000. */
  232 #define com_emr         com_msr
  233 #define EMR_EXBUFF      0x04
  234 #define EMR_CTSFLW      0x08
  235 #define EMR_DSRFLW      0x10
  236 #define EMR_RTSFLW      0x20
  237 #define EMR_DTRFLW      0x40
  238 #define EMR_EFMODE      0x80

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