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During setting RTC time, driver will halt RTC update. So support bit 7 of reg_b. When it set to 0, time will be updated. And when it's set to 1, rtc will keep the second it was set. In the process of getting RTC time, driver sets alarm interrupt, waits 1s, and get alarm interrupt flag. So support alarm interrupt flag update. If alarm interrupt is enabled (bit 5, reg_b set to 1), interrupt flag register will be set (bit 7 & bit 5 of reg_c) at appropriate time. Tracked-On: #7440 Signed-off-by: Yuanyuan Zhao <yuanyuan.zhao@linux.intel.com> Reviewed-by: Junjie Mao <junjie.mao@intel.com>
73 lines
2.9 KiB
C
73 lines
2.9 KiB
C
/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* Copyright (C) 2022 Intel Corporation.
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*
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* This code is derived from software contributed to Berkeley by
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* William Jolitz.
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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. Neither the name of the University nor the names of its contributors
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* may 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 THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)rtc.h 7.1 (Berkeley) 5/12/91
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* $FreeBSD$
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*/
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#ifndef _MC146818_RTC_H_
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#define _MC146818_RTC_H_
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/*
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* MC146818 RTC Register locations
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*/
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#define RTC_SEC 0x00 /* seconds */
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#define RTC_SECALRM 0x01 /* seconds alarm */
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#define RTC_MIN 0x02 /* minutes */
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#define RTC_MINALRM 0x03 /* minutes alarm */
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#define RTC_HRS 0x04 /* hours */
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#define RTC_HRSALRM 0x05 /* hours alarm */
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#define RTC_WDAY 0x06 /* week day */
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#define RTC_DAY 0x07 /* day of month */
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#define RTC_MONTH 0x08 /* month of year */
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#define RTC_YEAR 0x09 /* year in century*/
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#define RTC_CENTURY 0x32 /* century */
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#define RTC_STATUSA 0x0a /* status register A */
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#define RTCSA_TUP 0x80U /* time update, don't look now */
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#define RTC_STATUSB 0x0b /* status register B */
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#define RTCSB_24HR 0x02U /* 0 = 12 hours, 1 = 24 hours */
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#define RTCSB_BCD 0x04U /* 0 = BCD, 1 = Binary coded time */
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#define RTCSB_AINTR 0x20U /* 1 = enable alarm interrupt */
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#define RTCSB_HALT 0x80U /* stop clock updates */
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#define RTC_INTR 0x0c /* status register C (R) interrupt source */
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#define RTCIR_ALARM 0x20U /* alarm intr */
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#define RTCIR_INT 0x80U /* interrupt output signal */
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#define RTC_STATUSD 0x0d /* status register D (R) Lost Power */
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#endif /* _MC146818_RTC_H_ */
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