/* $NetBSD: weaselreg.h,v 1.8 2022/04/11 20:57:38 andvar Exp $ */
/*-
* Copyright (c) 2000 Zembu Labs, Inc.
* All rights reserved.
*
* Author: Jason R. Thorpe <
[email protected]>
*
* 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 */
} __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 service 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. */
