1 /* $NetBSD: weaselreg.h,v 1.7 2007/12/25 18:33:40 perry Exp $ */ 2 3 /*- 4 * Copyright (c) 2000 Zembu Labs, Inc. 5 * All rights reserved. 6 * 7 * Author: Jason R. Thorpe <thorpej@zembu.com> 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by Zembu Labs, Inc. 20 * 4. Neither the name of Zembu Labs nor the names of its employees may 21 * be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY ZEMBU LABS, INC. ``AS IS'' AND ANY EXPRESS 25 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WAR- 26 * RANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DIS- 27 * CLAIMED. IN NO EVENT SHALL ZEMBU LABS BE LIABLE FOR ANY DIRECT, INDIRECT, 28 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 29 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 30 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 33 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 /* 37 * Register and firmware communication definitions for the 38 * Middle Digital, Inc. PC-Weasel serial console board. 39 */ 40 41 /* 42 * Current versions of the PC-Weasel emulate a Monochrome Display 43 * Adapter. The framebuffer is at the standard ISA framebuffer 44 * location (0xb0000). At the end of the viewable framebuffer area 45 * is a control register space. 46 */ 47 48 #define WEASEL_WDT_SEMAPHORE 0x0fa0 49 50 #define WEASEL_CONFIG_BLOCK 0x0fa1 51 52 #define WEASEL_WDT_TICKLE 0x0fa2 53 54 #define WEASEL_MISC_COMMAND 0x0fcd 55 56 #define WEASEL_MISC_RESPONSE 0x0fce 57 58 /* 59 * Layout of the PC-Weasel configuration block. This is taken 60 * more or less right out of the PC-Weasel manual, page 52. 61 */ 62 struct weasel_config_block { 63 u_int8_t cfg_version; /* configuration version */ 64 65 #define CFG_VERSION_1_0 0x01 66 #define CFG_VERSION_1_1 0x02 67 68 u_int8_t weasel_attn; /* Weasel attention character */ 69 u_int8_t debug; /* debug level */ 70 u_int8_t reset_pc_on_boot;/* reset PC on Weasel boot */ 71 u_int8_t duart_baud; /* baud rate of DUART */ 72 u_int8_t duart_parity; /* 0 none, 1 even, 2 odd */ 73 u_int8_t duart_bits; /* 7 or 8 */ 74 75 /* 76 * Unfortunately, between cfg_version 1 and 2, the semantics 77 * of this variable changed. 78 * 79 * cfg_version 1: 80 * 81 * 0 == always emulate 82 * 1 == autoswitch 83 * 84 * cfg_version 2: 85 * 86 * 0 == always emulate 87 * 1 == always serial 88 * 2 == autoswitch 89 */ 90 u_int8_t enable_duart_switching; 91 u_int8_t wdt_allow; /* 0 disable, 1 allow */ 92 u_int16_t wdt_msec; /* watchdog timer period */ 93 u_int8_t duart_flow; /* 1 rts/cts, 0 none */ 94 u_int8_t break_passthru; /* BREAK is passed through */ 95 u_int8_t obsolete[30]; /* reserved for future use */ 96 u_int8_t cksum; /* arithmetic sum -> reserved */ 97 } __packed; 98 99 /* 100 * Commands that can be written to the MISC_COMMAND register. 101 */ 102 103 #define OS_READY 0x00 /* ready for commands */ 104 105 #define OS_UART_CLEAR 0x01 /* clear response for OS_UART_QUERY */ 106 107 #define OS_UART_QUERY 0x02 /* query Weasel UART setting */ 108 #define UART_QUERY_DIS 0x00 /* UART is disabled */ 109 #define UART_QUERY_3f8 0x01 /* UART at 0x3f8 */ 110 #define UART_QUERY_2F8 0x02 /* UART at 0x2f8 */ 111 #define UART_QUERY_3e8 0x03 /* UART at 0x3e8 */ 112 #define UART_QUERY_2e8 0x04 /* UART at 0x2e8 */ 113 114 #define OS_CONFIG_COPY 0x03 /* copy config to offscreen space */ 115 #define OS_WDT_QUERY 0x04 /* query watchdog state. 0=off 1=on */ 116 117 #define OS_NOP 0x07 118 119 /* 120 * The watchdog timer on the PC-Weasel is enabled/disabled (it's a toggle) 121 * using the WDT_SEMAPHORE register in the offscreen area. The semaphore 122 * is also used to service the watchdog. 123 * 124 * To toggle the watchdog: 125 * 126 * for (new_state = old_state; new_state == old_state;) { 127 * WDT_SEMAPHORE = 0x22; 128 * delay(1500); 129 * if (WDT_SEMAPHORE == 0xea) { 130 * WDT_SEMAPHORE = 0x2f; 131 * delay(1500); 132 * if (WDT_SEMAPHORE == 0xae) { 133 * WDT_SEMAPHORE = 0x37; 134 * delay(1500); 135 * new_state = WDT_SEMAPHORE; 136 * } 137 * } 138 * } 139 * 140 * To serivce the watchdog when armed: 141 * 142 * tmp = WDT_SEMPAPHORE; 143 * WDT_SEMAPHORE ~= tmp; 144 */ 145 #define WDT_ATTENTION 0x22 /* get the attention of the WDT state engine */ 146 #define WDT_OK 0xae /* we get back an acknowledgement */ 147 #define WDT_ENABLE 0xf1 /* the command to arm to watchdog. */ 148 #define WDT_DISABLE 0xf4 /* the command to disarm the watchdog. */ 149 150