1 /* $NetBSD: rtc.c,v 1.1.1.1 1998/06/09 07:53:06 dbj 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 <stand.h> 36 37 /* ### where shall I put this definition? */ 38 #define DELAY(n) { register int N = (n); while (--N > 0); } 39 40 static volatile u_int *scr2 = (u_int *)NEXT_P_SCR2_CON; 41 static u_char new_clock; 42 43 u_char 44 rtc_read(u_char reg) 45 { 46 int i; 47 u_int tmp; 48 u_char val; 49 50 *scr2 = (*scr2 & ~(SCR2_RTDATA | SCR2_RTCLK)) | SCR2_RTCE; 51 DELAY(1); 52 53 val = reg; 54 for (i=0; i<8; i++) { 55 tmp = *scr2 & ~(SCR2_RTDATA | SCR2_RTCLK); 56 if (val & 0x80) 57 tmp |= SCR2_RTDATA; 58 59 *scr2 = tmp; 60 DELAY(1); 61 *scr2 = tmp | SCR2_RTCLK; 62 DELAY(1); 63 *scr2 = tmp; 64 DELAY(1); 65 66 val <<= 1; 67 } 68 69 val = 0; /* should be anyway */ 70 for (i=0; i<8; i++) { 71 val <<= 1; 72 73 tmp = *scr2 & ~(SCR2_RTDATA | SCR2_RTCLK); 74 75 *scr2 = tmp | SCR2_RTCLK; 76 DELAY(1); 77 *scr2 = tmp; 78 DELAY(1); 79 80 if (*scr2 & SCR2_RTDATA) 81 val |= 1; 82 } 83 84 *scr2 &= ~(SCR2_RTDATA|SCR2_RTCLK|SCR2_RTCE); 85 DELAY(1); 86 87 return val; 88 } 89 90 void 91 rtc_init(void) 92 { 93 u_char val; 94 95 val = rtc_read(RTC_STATUS); 96 new_clock = (val & RTC_NEW_CLOCK) ? 1 : 0; 97 } 98 99 time_t 100 getsecs(void) 101 { 102 u_int secs; 103 104 if (new_clock) { 105 secs = rtc_read(RTC_CNTR3) << 24 | 106 rtc_read(RTC_CNTR2) << 16 | 107 rtc_read(RTC_CNTR1) << 8 | 108 rtc_read(RTC_CNTR0); 109 } else { 110 u_char d,h,m,s; 111 #define BCD_DECODE(x) (((x) >> 4) * 10 + ((x) & 0xf)) 112 113 d = rtc_read(RTC_DAY); 114 h = rtc_read(RTC_HRS); 115 m = rtc_read(RTC_MIN); 116 s = rtc_read(RTC_SEC); 117 secs = BCD_DECODE(d) * (60*60*24) + 118 BCD_DECODE(h) * (60*60) + 119 BCD_DECODE(m) * 60 + 120 BCD_DECODE(s); 121 } 122 123 return secs; 124 } 125