1 /* $OpenBSD: mcclock.c,v 1.5 2002/03/14 01:26:26 millert 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 <alpha/alpha/clockvar.h>
37 #include <alpha/alpha/mcclockvar.h>
38 #include <dev/ic/mc146818reg.h>
39
40 struct cfdriver mcclock_cd = {
41 NULL, "mcclock", DV_DULL,
42 };
43
44 void mcclock_init(struct device *);
45 void mcclock_get(struct device *, time_t, struct clocktime *);
46 void mcclock_set(struct device *, struct clocktime *);
47
48 const struct clockfns mcclock_clockfns = {
49 mcclock_init, mcclock_get, mcclock_set,
50 };
51
52 #define mc146818_write(dev, reg, datum) \
53 (*(dev)->sc_busfns->mc_bf_write)(dev, reg, datum)
54 #define mc146818_read(dev, reg) \
55 (*(dev)->sc_busfns->mc_bf_read)(dev, reg)
56
57 void
mcclock_attach(sc,busfns)58 mcclock_attach(sc, busfns)
59 struct mcclock_softc *sc;
60 const struct mcclock_busfns *busfns;
61 {
62
63 printf(": mc146818 or compatible");
64
65 sc->sc_busfns = busfns;
66
67 /* Turn interrupts off, just in case. */
68 mc146818_write(sc, MC_REGB, MC_REGB_BINARY | MC_REGB_24HR);
69
70 clockattach(&sc->sc_dev, &mcclock_clockfns);
71 }
72
73 void
mcclock_init(dev)74 mcclock_init(dev)
75 struct device *dev;
76 {
77 struct mcclock_softc *sc = (struct mcclock_softc *)dev;
78
79 mc146818_write(sc, MC_REGA, MC_BASE_32_KHz | MC_RATE_1024_Hz);
80 mc146818_write(sc, MC_REGB,
81 MC_REGB_PIE | MC_REGB_SQWE | MC_REGB_BINARY | MC_REGB_24HR);
82 }
83
84 /*
85 * Get the time of day, based on the clock's value and/or the base value.
86 */
87 void
mcclock_get(dev,base,ct)88 mcclock_get(dev, base, ct)
89 struct device *dev;
90 time_t base;
91 struct clocktime *ct;
92 {
93 struct mcclock_softc *sc = (struct mcclock_softc *)dev;
94 mc_todregs regs;
95 int s;
96
97 s = splclock();
98 MC146818_GETTOD(sc, ®s)
99 splx(s);
100
101 ct->sec = regs[MC_SEC];
102 ct->min = regs[MC_MIN];
103 ct->hour = regs[MC_HOUR];
104 ct->dow = regs[MC_DOW];
105 ct->day = regs[MC_DOM];
106 ct->mon = regs[MC_MONTH];
107 ct->year = regs[MC_YEAR];
108 }
109
110 /*
111 * Reset the TODR based on the time value.
112 */
113 void
mcclock_set(dev,ct)114 mcclock_set(dev, ct)
115 struct device *dev;
116 struct clocktime *ct;
117 {
118 struct mcclock_softc *sc = (struct mcclock_softc *)dev;
119 mc_todregs regs;
120 int s;
121
122 s = splclock();
123 MC146818_GETTOD(sc, ®s);
124 splx(s);
125
126 regs[MC_SEC] = ct->sec;
127 regs[MC_MIN] = ct->min;
128 regs[MC_HOUR] = ct->hour;
129 regs[MC_DOW] = ct->dow;
130 regs[MC_DOM] = ct->day;
131 regs[MC_MONTH] = ct->mon;
132 regs[MC_YEAR] = ct->year;
133
134 s = splclock();
135 MC146818_PUTTOD(sc, ®s);
136 splx(s);
137 }
138