1 /* $OpenBSD: mcclock.c,v 1.6 2022/10/15 14:58:54 jsg Exp $ */
2 /* $NetBSD: mcclock.c,v 1.4 1996/10/13 02:59:41 christos Exp $ */
3
4 /*
5 * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
6 * All rights reserved.
7 *
8 * Author: Chris G. Demetriou
9 *
10 * Permission to use, copy, modify and distribute this software and
11 * its documentation is hereby granted, provided that both the copyright
12 * notice and this permission notice appear in all copies of the
13 * software, derivative works or modified versions, and any portions
14 * thereof, and that both notices appear in supporting documentation.
15 *
16 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
17 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
18 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
19 *
20 * Carnegie Mellon requests users of this software to return to
21 *
22 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
23 * School of Computer Science
24 * Carnegie Mellon University
25 * Pittsburgh PA 15213-3890
26 *
27 * any improvements or extensions that they make and grant Carnegie the
28 * rights to redistribute these changes.
29 */
30
31 #include <sys/param.h>
32 #include <sys/kernel.h>
33 #include <sys/systm.h>
34 #include <sys/device.h>
35
36 #include <dev/clock_subr.h>
37 #include <dev/ic/mc146818reg.h>
38
39 #include <loongson/dev/mcclockvar.h>
40
41 struct cfdriver mcclock_cd = {
42 NULL, "mcclock", DV_DULL,
43 };
44
45 int mcclock_gettime(struct todr_chip_handle *, struct timeval *);
46 int mcclock_settime(struct todr_chip_handle *, struct timeval *);
47
48 #define mc146818_write(dev, reg, datum) \
49 (*(dev)->sc_busfns->mc_bf_write)(dev, reg, datum)
50 #define mc146818_read(dev, reg) \
51 (*(dev)->sc_busfns->mc_bf_read)(dev, reg)
52
53 void
mcclock_attach(struct mcclock_softc * sc,const struct mcclock_busfns * busfns)54 mcclock_attach(struct mcclock_softc *sc, const struct mcclock_busfns *busfns)
55 {
56
57 printf(": mc146818 or compatible\n");
58
59 sc->sc_busfns = busfns;
60
61 /* Turn interrupts off, just in case. */
62 mc146818_write(sc, MC_REGB, MC_REGB_BINARY | MC_REGB_24HR);
63 mc146818_write(sc, MC_REGA, MC_BASE_32_KHz | MC_RATE_NONE);
64
65 sc->sc_todr.cookie = sc;
66 sc->sc_todr.todr_gettime = mcclock_gettime;
67 sc->sc_todr.todr_settime = mcclock_settime;
68 sc->sc_todr.todr_quality = 0;
69 todr_attach(&sc->sc_todr);
70 }
71
72 /*
73 * Get the time of day, based on the clock's value and/or the base value.
74 */
75 int
mcclock_gettime(struct todr_chip_handle * handle,struct timeval * tv)76 mcclock_gettime(struct todr_chip_handle *handle, struct timeval *tv)
77 {
78 struct clock_ymdhms dt;
79 struct mcclock_softc *sc = handle->cookie;
80 mc_todregs regs;
81 int s;
82
83 s = splclock();
84 MC146818_GETTOD(sc, ®s)
85 splx(s);
86
87 dt.dt_sec = regs[MC_SEC];
88 dt.dt_min = regs[MC_MIN];
89 dt.dt_hour = regs[MC_HOUR];
90 dt.dt_day = regs[MC_DOM];
91 dt.dt_mon = regs[MC_MONTH];
92 dt.dt_year = regs[MC_YEAR] + 2000;
93
94 tv->tv_sec = clock_ymdhms_to_secs(&dt);
95 tv->tv_usec = 0;
96 return 0;
97 }
98
99 /*
100 * Reset the TODR based on the time value.
101 */
102 int
mcclock_settime(struct todr_chip_handle * handle,struct timeval * tv)103 mcclock_settime(struct todr_chip_handle *handle, struct timeval *tv)
104 {
105 struct clock_ymdhms dt;
106 struct mcclock_softc *sc = handle->cookie;
107 mc_todregs regs;
108 int s;
109
110 clock_secs_to_ymdhms(tv->tv_sec, &dt);
111
112 s = splclock();
113 MC146818_GETTOD(sc, ®s);
114 splx(s);
115
116 regs[MC_SEC] = dt.dt_sec;
117 regs[MC_MIN] = dt.dt_min;
118 regs[MC_HOUR] = dt.dt_hour;
119 regs[MC_DOW] = dt.dt_wday + 1;
120 regs[MC_DOM] = dt.dt_day;
121 regs[MC_MONTH] = dt.dt_mon;
122 regs[MC_YEAR] = dt.dt_year % 100;
123
124 s = splclock();
125 MC146818_PUTTOD(sc, ®s);
126 splx(s);
127
128 return 0;
129 }
130