1 /*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * Copyright (C) 2022 Intel Corporation. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * William Jolitz. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * from: @(#)rtc.h 7.1 (Berkeley) 5/12/91 35 * $FreeBSD$ 36 */ 37 38 #ifndef _MC146818_RTC_H_ 39 #define _MC146818_RTC_H_ 40 41 /* 42 * MC146818 RTC Register locations 43 */ 44 45 #define RTC_SEC 0x00 /* seconds */ 46 #define RTC_SECALRM 0x01 /* seconds alarm */ 47 #define RTC_MIN 0x02 /* minutes */ 48 #define RTC_MINALRM 0x03 /* minutes alarm */ 49 #define RTC_HRS 0x04 /* hours */ 50 #define RTC_HRSALRM 0x05 /* hours alarm */ 51 #define RTC_WDAY 0x06 /* week day */ 52 #define RTC_DAY 0x07 /* day of month */ 53 #define RTC_MONTH 0x08 /* month of year */ 54 #define RTC_YEAR 0x09 /* year in century*/ 55 #define RTC_CENTURY 0x32 /* century */ 56 57 #define RTC_STATUSA 0x0a /* status register A */ 58 #define RTCSA_TUP 0x80U /* time update, don't look now */ 59 60 #define RTC_STATUSB 0x0b /* status register B */ 61 #define RTCSB_24HR 0x02U /* 0 = 12 hours, 1 = 24 hours */ 62 #define RTCSB_BCD 0x04U /* 0 = BCD, 1 = Binary coded time */ 63 #define RTCSB_AINTR 0x20U /* 1 = enable alarm interrupt */ 64 #define RTCSB_HALT 0x80U /* stop clock updates */ 65 66 #define RTC_INTR 0x0c /* status register C (R) interrupt source */ 67 #define RTCIR_ALARM 0x20U /* alarm intr */ 68 #define RTCIR_INT 0x80U /* interrupt output signal */ 69 70 #define RTC_STATUSD 0x0d /* status register D (R) Lost Power */ 71 72 #endif /* _MC146818_RTC_H_ */ 73