143 lines
4.7 KiB
C
143 lines
4.7 KiB
C
/* $NetBSD: weaselreg.h,v 1.5 2001/01/23 17:18:23 hpeyerl Exp $ */
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/*-
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* Copyright (c) 2000 Zembu Labs, Inc.
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* All rights reserved.
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*
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* Author: Jason R. Thorpe <thorpej@zembu.com>
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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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* 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Zembu Labs, Inc.
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* 4. Neither the name of Zembu Labs nor the names of its employees may
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* be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY ZEMBU LABS, INC. ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WAR-
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* RANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DIS-
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* CLAIMED. IN NO EVENT SHALL ZEMBU LABS 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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/*
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* Register and firmware communication definitions for the
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* Middle Digital, Inc. PC-Weasel serial console board.
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*/
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/*
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* Current versions of the PC-Weasel emulate a Monochrome Display
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* Adapter. The framebuffer is at the standard ISA framebuffer
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* location (0xb0000). At the end of the viewable framebuffer area
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* is a control register space.
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*/
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#define WEASEL_WDT_SEMAPHORE 0x0fa0
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#define WEASEL_CONFIG_BLOCK 0x0fa1
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#define WEASEL_MISC_COMMAND 0x0fcd
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#define WEASEL_MISC_RESPONSE 0x0fce
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/*
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* Layout of the PC-Weasel configuration block. This is taken
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* more or less right out of the PC-Weasel manual, page 52.
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*/
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struct weasel_config_block {
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u_int8_t cfg_version; /* configuration version */
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#define CFG_VERSION_1_0 0x01
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#define CFG_VERSION_1_1 0x02
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u_int8_t weasel_attn; /* Weasel attention character */
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u_int8_t debug; /* debug level */
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u_int8_t reset_pc_on_boot;/* reset PC on Weasel boot */
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u_int8_t duart_baud; /* baud rate of DUART */
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u_int8_t duart_parity; /* 0 none, 1 even, 2 odd */
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u_int8_t duart_bits; /* 7 or 8 */
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/*
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* Unfortunately, between cfg_version 1 and 2, the semantics
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* of this variable changed.
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*
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* cfg_version 1:
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*
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* 0 == always emulate
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* 1 == autoswitch
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*
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* cfg_version 2:
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*
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* 0 == always emulate
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* 1 == always serial
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* 2 == autoswitch
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*/
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u_int8_t enable_duart_switching;
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u_int8_t wdt_allow; /* 0 disable, 1 allow */
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u_int16_t wdt_msec; /* watchdog timer period */
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u_int8_t duart_flow; /* 1 rts/cts, 0 none */
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u_int8_t break_passthru; /* BREAK is passed through */
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u_int8_t obsolete[30]; /* reserved for future use */
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u_int8_t cksum; /* arithmetic sum -> reserved */
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} __attribute__((__packed__));
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/*
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* Commands that can be written to the MISC_COMMAND register.
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*/
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#define OS_READY 0x00 /* ready for commands */
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#define OS_UART_CLEAR 0x01 /* clear response for OS_UART_QUERY */
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#define OS_UART_QUERY 0x02 /* query Weasel UART setting */
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#define UART_QUERY_DIS 0x00 /* UART is disabled */
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#define UART_QUERY_3f8 0x01 /* UART at 0x3f8 */
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#define UART_QUERY_2F8 0x02 /* UART at 0x2f8 */
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#define UART_QUERY_3e8 0x03 /* UART at 0x3e8 */
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#define UART_QUERY_2e8 0x04 /* UART at 0x2e8 */
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#define OS_CONFIG_COPY 0x03 /* copy config to offscreen space */
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#define OS_WDT_QUERY 0x04 /* query watchdog state. 0=off 1=on */
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#define OS_NOP 0x07
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/*
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* The watchdog timer on the PC-Weasel is enabled/disabled (it's a toggle)
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* using the WDT_SEMAPHORE register in the offscreen area. The semaphore
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* is also used to service the watchdog.
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*
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* To toggle the watchdog:
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*
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* for (new_state = old_state; new_state == old_state;) {
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* WDT_SEMAPHORE = 0x22;
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* delay(1500);
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* if (WDT_SEMAPHORE == 0xea) {
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* WDT_SEMAPHORE = 0x2f;
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* delay(1500);
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* if (WDT_SEMAPHORE == 0xae) {
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* WDT_SEMAPHORE = 0x37;
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* delay(1500);
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* new_state = WDT_SEMAPHORE;
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* }
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* }
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* }
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*
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* To serivce the watchdog when armed:
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*
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* tmp = WDT_SEMPAPHORE;
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* WDT_SEMAPHORE ~= tmp;
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*/
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