1 /* $OpenBSD: getsecs.c,v 1.5 2023/02/23 13:28:38 aoyama Exp $ */
2 /* $NetBSD: getsecs.c,v 1.1 2013/01/13 14:10:55 tsutsui Exp $ */
3
4 /*-
5 * Copyright (c) 2004 The NetBSD Foundation, Inc.
6 * All rights reserved.
7 *
8 * This code is derived from software contributed to The NetBSD Foundation
9 * by UCHIYAMA Yasushi.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 #include <luna88k/stand/boot/samachdep.h>
34 #include <machine/board.h>
35 #include <luna88k/dev/timekeeper.h>
36
37 #define _DS_GET(off, data) \
38 do { *chiptime = (off); (data) = (*chipdata); } while (0)
39 #define _DS_SET(off, data) \
40 do { *chiptime = (off); *chipdata = (uint8_t)(data); } while (0)
41
42 /*
43 * Convert a single byte between (unsigned) packed bcd and binary.
44 * Public domain.
45 */
46 unsigned int
bcdtobin(unsigned int bcd)47 bcdtobin(unsigned int bcd)
48 {
49
50 return (((bcd >> 4) & 0x0f) * 10 + (bcd & 0x0f));
51 }
52
53 typedef struct {
54 uint Year;
55 uint Month;
56 uint Day;
57 uint Hour;
58 uint Minute;
59 uint Second;
60 } rtc_time;
61
62 #define MK_YEAR0 1970 /* year offset of MK */
63 #define DS_YEAR0 1990 /* year offset of DS */
64
65 static void
mk_gettime(rtc_time * t)66 mk_gettime(rtc_time *t) {
67 volatile uint32_t *mclock =
68 (volatile uint32_t *)(NVRAM_ADDR + MK_NVRAM_SPACE);
69 mclock[MK_CSR] |= MK_CSR_READ << 24;
70 t->Second = bcdtobin(mclock[MK_SEC] >> 24);
71 t->Minute = bcdtobin(mclock[MK_MIN] >> 24);
72 t->Hour = bcdtobin(mclock[MK_HOUR] >> 24);
73 t->Day = bcdtobin(mclock[MK_DOM] >> 24);
74 t->Month = bcdtobin(mclock[MK_MONTH] >> 24);
75 t->Year = bcdtobin(mclock[MK_YEAR] >> 24);
76 mclock[MK_CSR] &= ~(MK_CSR_READ << 24);
77
78 /* UniOS-Mach doesn't set the correct BCD year after Y2K */
79 if (t->Year > 100) t->Year -= (MK_YEAR0 % 100);
80
81 t->Year += MK_YEAR0;
82
83 return;
84 }
85
86 static void
ds_gettime(rtc_time * t)87 ds_gettime(rtc_time *t) {
88 volatile uint8_t *chiptime = (volatile uint8_t *)NVRAM_ADDR;
89 volatile uint8_t *chipdata = chiptime + 1;
90
91 uint8_t c;
92
93 /* specify 24hr and BCD mode */
94 _DS_GET(DS_REGB, c);
95 c |= DS_REGB_24HR;
96 c &= ~DS_REGB_BINARY;
97 _DS_SET(DS_REGB, c);
98
99 /* update in progress; spin loop */
100 for (;;) {
101 *chiptime = DS_REGA;
102 if ((*chipdata & DS_REGA_UIP) == 0)
103 break;
104 }
105
106 *chiptime = DS_SEC;
107 t->Second = bcdtobin(*chipdata);
108 *chiptime = DS_MIN;
109 t->Minute = bcdtobin(*chipdata);
110 *chiptime = DS_HOUR;
111 t->Hour = bcdtobin(*chipdata);
112 *chiptime = DS_DOM;
113 t->Day = bcdtobin(*chipdata);
114 *chiptime = DS_MONTH;
115 t->Month = bcdtobin(*chipdata);
116 *chiptime = DS_YEAR;
117 t->Year = bcdtobin(*chipdata);
118
119 /* UniOS-Mach doesn't set the correct BCD year after Y2K */
120 if (t->Year > 100) t->Year -= (DS_YEAR0 % 100);
121
122 t->Year += DS_YEAR0;
123
124 return;
125 }
126
127 time_t
getsecs(void)128 getsecs(void)
129 {
130 rtc_time t;
131 time_t r = 0;
132 int y = 0;
133 const int daytab[][14] = {
134 { 0, -1, 30, 58, 89, 119, 150, 180, 211, 242, 272, 303, 333, 364 },
135 { 0, -1, 30, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
136 };
137 #define isleap(_y) (((_y) % 4) == 0 && (((_y) % 100) != 0 || ((_y) % 400) == 0))
138
139 if (machtype == LUNA_88K) {
140 mk_gettime(&t);
141 } else {
142 ds_gettime(&t);
143 }
144
145 /* Calc days from UNIX epoch */
146 r = (t.Year - 1970) * 365;
147 for (y = 1970; y < t.Year; y++) {
148 if (isleap(y))
149 r++;
150 }
151 r += daytab[isleap(t.Year)? 1 : 0][t.Month] + t.Day;
152
153 /* Calc secs */
154 r *= 60 * 60 * 24;
155 r += ((t.Hour * 60) + t.Minute) * 60 + t.Second;
156
157 return (r);
158 }
159