/* $NetBSD: rtc.c,v 1.6.70.2 2023/02/22 12:09:16 martin Exp $ */ /* * Copyright (c) 1997 Rolf Grossmann * All rights reserved. * * 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 Rolf Grossmann. * 4. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR 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. */ #include #include #include #include #include #include "samachdep.h" u_char rtc_read(u_char); static volatile u_int *scr2 = (u_int *)NEXT_P_SCR2_CON; static u_char new_clock; u_char rtc_read(u_char reg) { int i; u_int tmp; u_char val; *scr2 = (*scr2 & ~(SCR2_RTDATA | SCR2_RTCLK)) | SCR2_RTCE; DELAY(1); val = reg; for (i=0; i<8; i++) { tmp = *scr2 & ~(SCR2_RTDATA | SCR2_RTCLK); if (val & 0x80) tmp |= SCR2_RTDATA; *scr2 = tmp; DELAY(1); *scr2 = tmp | SCR2_RTCLK; DELAY(1); *scr2 = tmp; DELAY(1); val <<= 1; } val = 0; /* should be anyway */ for (i=0; i<8; i++) { val <<= 1; tmp = *scr2 & ~(SCR2_RTDATA | SCR2_RTCLK); *scr2 = tmp | SCR2_RTCLK; DELAY(1); *scr2 = tmp; DELAY(1); if (*scr2 & SCR2_RTDATA) val |= 1; } *scr2 &= ~(SCR2_RTDATA|SCR2_RTCLK|SCR2_RTCE); DELAY(1); return val; } void rtc_init(void) { u_char val; val = rtc_read(RTC_STATUS); new_clock = (val & RTC_NEW_CLOCK) ? 1 : 0; } satime_t getsecs(void) { u_int secs; if (new_clock) { secs = rtc_read(RTC_CNTR0) << 24 | rtc_read(RTC_CNTR1) << 16 | rtc_read(RTC_CNTR2) << 8 | rtc_read(RTC_CNTR3); } else { u_char d,h,m,s; #define BCD_DECODE(x) (((x) >> 4) * 10 + ((x) & 0xf)) d = rtc_read(RTC_DAY); h = rtc_read(RTC_HRS); m = rtc_read(RTC_MIN); s = rtc_read(RTC_SEC); secs = BCD_DECODE(d) * (60*60*24) + BCD_DECODE(h) * (60*60) + BCD_DECODE(m) * 60 + BCD_DECODE(s); } return secs; }