FreeBSD/Linux Kernel Cross Reference
sys/dev/isa/weaselreg.h

     /*      $NetBSD: weaselreg.h,v 1.6 2001/05/03 17:55:47 hpeyerl Exp $    */
     
     /*-
      * Copyright (c) 2000 Zembu Labs, Inc.
      * All rights reserved.
      *
      * Author: Jason R. Thorpe <thorpej@zembu.com>
      *
      * 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.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by Zembu Labs, Inc.
     * 4. Neither the name of Zembu Labs nor the names of its employees may
     *    be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY ZEMBU LABS, INC. ``AS IS'' AND ANY EXPRESS
     * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WAR-
     * RANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DIS-
     * CLAIMED.  IN NO EVENT SHALL ZEMBU LABS 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.
     */
    
    /*
     * Register and firmware communication definitions for the
     * Middle Digital, Inc. PC-Weasel serial console board.
     */
    
    /*
     * Current versions of the PC-Weasel emulate a Monochrome Display
     * Adapter.  The framebuffer is at the standard ISA framebuffer
     * location (0xb0000).  At the end of the viewable framebuffer area
     * is a control register space.
     */
    
    #define WEASEL_WDT_SEMAPHORE            0x0fa0
    
    #define WEASEL_CONFIG_BLOCK             0x0fa1
    
    #define WEASEL_WDT_TICKLE               0x0fa2
    
    #define WEASEL_MISC_COMMAND             0x0fcd
    
    #define WEASEL_MISC_RESPONSE            0x0fce
    
    /*
     * Layout of the PC-Weasel configuration block.  This is taken
     * more or less right out of the PC-Weasel manual, page 52.
     */
    struct weasel_config_block {
            u_int8_t        cfg_version;    /* configuration version */
    
    #define CFG_VERSION_1_0         0x01
    #define CFG_VERSION_1_1         0x02
    
            u_int8_t        weasel_attn;    /* Weasel attention character */
            u_int8_t        debug;          /* debug level */
            u_int8_t        reset_pc_on_boot;/* reset PC on Weasel boot */
            u_int8_t        duart_baud;     /* baud rate of DUART */
            u_int8_t        duart_parity;   /* 0 none, 1 even, 2 odd */
            u_int8_t        duart_bits;     /* 7 or 8 */
    
            /*
             * Unfortunately, between cfg_version 1 and 2, the semantics
             * of this variable changed.
             *
             *      cfg_version 1:
             *
             *              0 == always emulate
             *              1 == autoswitch
             *
             *      cfg_version 2:
             *
             *              0 == always emulate
             *              1 == always serial
             *              2 == autoswitch
             */
            u_int8_t        enable_duart_switching;
            u_int8_t        wdt_allow;      /* 0 disable, 1 allow */
            u_int16_t       wdt_msec;       /* watchdog timer period */
            u_int8_t        duart_flow;     /* 1 rts/cts, 0 none */
            u_int8_t        break_passthru; /* BREAK is passed through */
            u_int8_t        obsolete[30];   /* reserved for future use */
            u_int8_t        cksum;          /* arithmetic sum -> reserved */
    } __attribute__((__packed__));
    
    /*
    * Commands that can be written to the MISC_COMMAND register.
    */
   
   #define OS_READY        0x00            /* ready for commands */
   
   #define OS_UART_CLEAR   0x01            /* clear response for OS_UART_QUERY */
   
   #define OS_UART_QUERY   0x02            /* query Weasel UART setting */
   #define UART_QUERY_DIS  0x00            /* UART is disabled */
   #define UART_QUERY_3f8  0x01            /* UART at 0x3f8 */
   #define UART_QUERY_2F8  0x02            /* UART at 0x2f8 */
   #define UART_QUERY_3e8  0x03            /* UART at 0x3e8 */
   #define UART_QUERY_2e8  0x04            /* UART at 0x2e8 */
   
   #define OS_CONFIG_COPY  0x03            /* copy config to offscreen space */
   #define OS_WDT_QUERY    0x04            /* query watchdog state. 0=off 1=on */
   
   #define OS_NOP          0x07
   
   /*
    * The watchdog timer on the PC-Weasel is enabled/disabled (it's a toggle)
    * using the WDT_SEMAPHORE register in the offscreen area.  The semaphore
    * is also used to service the watchdog.
    *
    * To toggle the watchdog:
    *
    *      for (new_state = old_state; new_state == old_state;) {
    *              WDT_SEMAPHORE = 0x22;
    *              delay(1500);
    *              if (WDT_SEMAPHORE == 0xea) {
    *                      WDT_SEMAPHORE = 0x2f;
    *                      delay(1500);
    *                      if (WDT_SEMAPHORE == 0xae) {
    *                              WDT_SEMAPHORE = 0x37;
    *                              delay(1500);
    *                              new_state = WDT_SEMAPHORE;
    *                      }
    *              }
    *      }
    *
    * To serivce the watchdog when armed:
    *
    *      tmp = WDT_SEMPAPHORE;
    *      WDT_SEMAPHORE ~= tmp;
    */
   #define WDT_ATTENTION   0x22    /* get the attention of the WDT state engine */
   #define WDT_OK          0xae    /* we get back an acknowledgement */
   #define WDT_ENABLE      0xf1    /* the command to arm to watchdog. */
   #define WDT_DISABLE     0xf4    /* the command to disarm the watchdog. */
   

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