1 /* $NetBSD: rtc.c,v 1.6 2009/01/12 11:32:44 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 u_char rtc_read(u_char); 39 void rtc_init(void); 40 41 42 /* ### where shall I put this definition? */ 43 #define DELAY(n) { register int N = (n); while (--N > 0); } 44 45 static volatile u_int *scr2 = (u_int *)NEXT_P_SCR2_CON; 46 static u_char new_clock; 47 48 u_char 49 rtc_read(u_char reg) 50 { 51 int i; 52 u_int tmp; 53 u_char val; 54 55 *scr2 = (*scr2 & ~(SCR2_RTDATA | SCR2_RTCLK)) | SCR2_RTCE; 56 DELAY(1); 57 58 val = reg; 59 for (i=0; i<8; i++) { 60 tmp = *scr2 & ~(SCR2_RTDATA | SCR2_RTCLK); 61 if (val & 0x80) 62 tmp |= SCR2_RTDATA; 63 64 *scr2 = tmp; 65 DELAY(1); 66 *scr2 = tmp | SCR2_RTCLK; 67 DELAY(1); 68 *scr2 = tmp; 69 DELAY(1); 70 71 val <<= 1; 72 } 73 74 val = 0; /* should be anyway */ 75 for (i=0; i<8; i++) { 76 val <<= 1; 77 78 tmp = *scr2 & ~(SCR2_RTDATA | SCR2_RTCLK); 79 80 *scr2 = tmp | SCR2_RTCLK; 81 DELAY(1); 82 *scr2 = tmp; 83 DELAY(1); 84 85 if (*scr2 & SCR2_RTDATA) 86 val |= 1; 87 } 88 89 *scr2 &= ~(SCR2_RTDATA|SCR2_RTCLK|SCR2_RTCE); 90 DELAY(1); 91 92 return val; 93 } 94 95 void 96 rtc_init(void) 97 { 98 u_char val; 99 100 val = rtc_read(RTC_STATUS); 101 new_clock = (val & RTC_NEW_CLOCK) ? 1 : 0; 102 } 103 104 satime_t 105 getsecs(void) 106 { 107 u_int secs; 108 109 if (new_clock) { 110 secs = rtc_read(RTC_CNTR0) << 24 | 111 rtc_read(RTC_CNTR1) << 16 | 112 rtc_read(RTC_CNTR2) << 8 | 113 rtc_read(RTC_CNTR3); 114 } else { 115 u_char d,h,m,s; 116 #define BCD_DECODE(x) (((x) >> 4) * 10 + ((x) & 0xf)) 117 118 d = rtc_read(RTC_DAY); 119 h = rtc_read(RTC_HRS); 120 m = rtc_read(RTC_MIN); 121 s = rtc_read(RTC_SEC); 122 secs = BCD_DECODE(d) * (60*60*24) + 123 BCD_DECODE(h) * (60*60) + 124 BCD_DECODE(m) * 60 + 125 BCD_DECODE(s); 126 } 127 128 return secs; 129 } 130