1 /* $NetBSD: clock.c,v 1.14 2023/01/15 06:19:46 tsutsui Exp $ */
2
3 /*
4 * Copyright (c) 1988 University of Utah.
5 * Copyright (c) 1982, 1990, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * the Systems Programming Group of the University of Utah Computer
10 * Science Department.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * from: Utah $Hdr: clock.c 1.18 91/01/21$
37 *
38 * @(#)clock.c 8.2 (Berkeley) 1/12/94
39 */
40
41 #include <sys/param.h>
42
43 #include <net/if_ether.h>
44 #include <netinet/in.h>
45 #include <netinet/in_systm.h>
46
47 #include <hp300/stand/common/hilreg.h>
48
49 #include <hp300/dev/frodoreg.h> /* for APCI offsets */
50 #include <hp300/dev/intioreg.h> /* for frodo offsets */
51 #include <dev/ic/mc146818reg.h>
52 #include <dev/clock_subr.h>
53
54 #include <lib/libsa/stand.h>
55 #include <lib/libsa/net.h>
56 #include <hp300/stand/common/samachdep.h>
57
58 #define FEBRUARY 2
59
60 #define BBC_SET_REG 0xe0
61 #define BBC_WRITE_REG 0xc2
62 #define BBC_READ_REG 0xc3
63 #define NUM_BBC_REGS 12
64
65 #define range_test(n, l, h) if ((n) < (l) || (n) > (h)) return false
66 #define bbc_to_decimal(a,b) (bbc_registers[a] * 10 + bbc_registers[b])
67
68 static uint8_t bbc_registers[13];
69 static struct hil_dev *bbcaddr = BBCADDR;
70
71 static volatile uint8_t *mcclock =
72 (volatile uint8_t *)(INTIOBASE + FRODO_BASE + FRODO_CALENDAR);
73
74 static bool clock_to_gmt(satime_t *);
75
76 static void read_bbc(void);
77 static uint8_t read_bbc_reg(int);
78 static uint8_t mc_read(u_int);
79
80 satime_t
getsecs(void)81 getsecs(void)
82 {
83 static bool clockinited = false;
84 satime_t timbuf = 0;
85
86 if (!clock_to_gmt(&timbuf) && !clockinited)
87 printf("WARNING: bad date in battery clock\n");
88 clockinited = true;
89
90 /* Battery clock does not store usec's, so forget about it. */
91 return timbuf;
92 }
93
94 static bool
clock_to_gmt(satime_t * timbuf)95 clock_to_gmt(satime_t *timbuf)
96 {
97 int i;
98 satime_t tmp;
99 int year, month, day, hour, min, sec;
100
101 if (machineid == HP_425 && mmuid == MMUID_425_E) {
102 /* 425e uses mcclock on the frodo utility chip */
103 while ((mc_read(MC_REGA) & MC_REGA_UIP) != 0)
104 continue;
105 sec = mc_read(MC_SEC);
106 min = mc_read(MC_MIN);
107 hour = mc_read(MC_HOUR);
108 day = mc_read(MC_DOM);
109 month = mc_read(MC_MONTH);
110 year = mc_read(MC_YEAR) + 1900;
111 } else {
112 /* Use the traditional HIL bbc for all other models */
113 read_bbc();
114
115 sec = bbc_to_decimal(1, 0);
116 min = bbc_to_decimal(3, 2);
117
118 /*
119 * Hours are different for some reason. Makes no sense really.
120 */
121 hour = ((bbc_registers[5] & 0x03) * 10) + bbc_registers[4];
122 day = bbc_to_decimal(8, 7);
123 month = bbc_to_decimal(10, 9);
124 year = bbc_to_decimal(12, 11) + 1900;
125 }
126
127 if (year < POSIX_BASE_YEAR)
128 year += 100;
129
130 #ifdef CLOCK_DEBUG
131 printf("clock todr: %u/%u/%u %u:%u:%u\n",
132 year, month, day, hour, min, sec);
133 #endif
134
135 range_test(hour, 0, 23);
136 range_test(day, 1, 31);
137 range_test(month, 1, 12);
138
139 tmp = 0;
140
141 for (i = POSIX_BASE_YEAR; i < year; i++)
142 tmp += days_per_year(i);
143 if (is_leap_year(year) && month > FEBRUARY)
144 tmp++;
145
146 for (i = 1; i < month; i++)
147 tmp += days_in_month(i);
148
149 tmp += (day - 1);
150 tmp = ((tmp * 24 + hour) * 60 + min) * 60 + sec;
151
152 *timbuf = tmp;
153 return true;
154 }
155
156 static void
read_bbc(void)157 read_bbc(void)
158 {
159 int i;
160 bool read_okay;
161
162 read_okay = false;
163 while (!read_okay) {
164 read_okay = true;
165 for (i = 0; i <= NUM_BBC_REGS; i++)
166 bbc_registers[i] = read_bbc_reg(i);
167 for (i = 0; i <= NUM_BBC_REGS; i++)
168 if (bbc_registers[i] != read_bbc_reg(i))
169 read_okay = false;
170 }
171 }
172
173 static uint8_t
read_bbc_reg(int reg)174 read_bbc_reg(int reg)
175 {
176 uint8_t data = reg;
177
178 if (bbcaddr != NULL) {
179 #if 0
180 send_hil_cmd(bbcaddr, BBC_SET_REG, &data, 1, NULL);
181 send_hil_cmd(bbcaddr, BBC_READ_REG, NULL, 0, &data);
182 #else
183 HILWAIT(bbcaddr);
184 bbcaddr->hil_cmd = BBC_SET_REG;
185 HILWAIT(bbcaddr);
186 bbcaddr->hil_data = data;
187 HILWAIT(bbcaddr);
188 bbcaddr->hil_cmd = BBC_READ_REG;
189 HILDATAWAIT(bbcaddr);
190 data = bbcaddr->hil_data;
191 #endif
192 }
193 return data;
194 }
195
196 uint8_t
mc_read(u_int reg)197 mc_read(u_int reg)
198 {
199 uint8_t datum;
200
201 mcclock[0] = (uint8_t)reg;
202 datum = mcclock[1 << 2]; /* frodo chip has 4 byte stride */
203
204 return datum;
205 }
206