1/* $NetBSD: rtc.c,v 1.8 2023/02/12 08:25:09 tsutsui Exp $ */ 2/* 3 * Copyright (c) 1997 Rolf Grossmann 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by Rolf Grossmann. 17 * 4. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32#include <sys/param.h> 33#include <next68k/dev/clockreg.h> 34#include <machine/cpu.h> 35#include <lib/libsa/stand.h> 36#include <lib/libsa/net.h> 37 38#include "samachdep.h" 39 40u_char rtc_read(u_char); 41 42static volatile u_int *scr2 = (u_int *)NEXT_P_SCR2_CON; 43static u_char new_clock; 44 45u_char 46rtc_read(u_char reg) 47{ 48 int i; 49 u_int tmp; 50 u_char val; 51 52 *scr2 = (*scr2 & ~(SCR2_RTDATA | SCR2_RTCLK)) | SCR2_RTCE; 53 DELAY(1); 54 55 val = reg; 56 for (i=0; i<8; i++) { 57 tmp = *scr2 & ~(SCR2_RTDATA | SCR2_RTCLK); 58 if (val & 0x80) 59 tmp |= SCR2_RTDATA; 60 61 *scr2 = tmp; 62 DELAY(1); 63 *scr2 = tmp | SCR2_RTCLK; 64 DELAY(1); 65 *scr2 = tmp; 66 DELAY(1); 67 68 val <<= 1; 69 } 70 71 val = 0; /* should be anyway */ 72 for (i=0; i<8; i++) { 73 val <<= 1; 74 75 tmp = *scr2 & ~(SCR2_RTDATA | SCR2_RTCLK); 76 77 *scr2 = tmp | SCR2_RTCLK; 78 DELAY(1); 79 *scr2 = tmp; 80 DELAY(1); 81 82 if (*scr2 & SCR2_RTDATA) 83 val |= 1; 84 } 85 86 *scr2 &= ~(SCR2_RTDATA|SCR2_RTCLK|SCR2_RTCE); 87 DELAY(1); 88 89 return val; 90} 91 92void 93rtc_init(void) 94{ 95 u_char val; 96 97 val = rtc_read(RTC_STATUS); 98 new_clock = (val & RTC_NEW_CLOCK) ? 1 : 0; 99} 100 101satime_t 102getsecs(void) 103{ 104 u_int secs; 105 106 if (new_clock) { 107 secs = rtc_read(RTC_CNTR0) << 24 | 108 rtc_read(RTC_CNTR1) << 16 | 109 rtc_read(RTC_CNTR2) << 8 | 110 rtc_read(RTC_CNTR3); 111 } else { 112 u_char d,h,m,s; 113#define BCD_DECODE(x) (((x) >> 4) * 10 + ((x) & 0xf)) 114 115 d = rtc_read(RTC_DAY); 116 h = rtc_read(RTC_HRS); 117 m = rtc_read(RTC_MIN); 118 s = rtc_read(RTC_SEC); 119 secs = BCD_DECODE(d) * (60*60*24) + 120 BCD_DECODE(h) * (60*60) + 121 BCD_DECODE(m) * 60 + 122 BCD_DECODE(s); 123 } 124 125 return secs; 126} 127