mcclock.c revision 1.13 1 1.13 lukem /* $NetBSD: mcclock.c,v 1.13 2001/11/13 12:49:45 lukem Exp $ */
2 1.2 cgd
3 1.2 cgd /*
4 1.2 cgd * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
5 1.2 cgd * All rights reserved.
6 1.2 cgd *
7 1.2 cgd * Author: Chris G. Demetriou
8 1.2 cgd *
9 1.2 cgd * Permission to use, copy, modify and distribute this software and
10 1.2 cgd * its documentation is hereby granted, provided that both the copyright
11 1.2 cgd * notice and this permission notice appear in all copies of the
12 1.2 cgd * software, derivative works or modified versions, and any portions
13 1.2 cgd * thereof, and that both notices appear in supporting documentation.
14 1.2 cgd *
15 1.2 cgd * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
16 1.2 cgd * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
17 1.2 cgd * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
18 1.2 cgd *
19 1.2 cgd * Carnegie Mellon requests users of this software to return to
20 1.2 cgd *
21 1.2 cgd * Software Distribution Coordinator or Software.Distribution (at) CS.CMU.EDU
22 1.2 cgd * School of Computer Science
23 1.2 cgd * Carnegie Mellon University
24 1.2 cgd * Pittsburgh PA 15213-3890
25 1.2 cgd *
26 1.2 cgd * any improvements or extensions that they make and grant Carnegie the
27 1.2 cgd * rights to redistribute these changes.
28 1.2 cgd */
29 1.6 cgd
30 1.13 lukem #include <sys/cdefs.h>
31 1.13 lukem __KERNEL_RCSID(0, "$NetBSD: mcclock.c,v 1.13 2001/11/13 12:49:45 lukem Exp $");
32 1.1 cgd
33 1.1 cgd #include <sys/param.h>
34 1.1 cgd #include <sys/kernel.h>
35 1.1 cgd #include <sys/systm.h>
36 1.1 cgd #include <sys/device.h>
37 1.1 cgd
38 1.8 jonathan #include <dev/dec/clockvar.h>
39 1.8 jonathan #include <dev/dec/mcclockvar.h>
40 1.1 cgd #include <dev/ic/mc146818reg.h>
41 1.1 cgd
42 1.11 jonathan /*
43 1.11 jonathan * XXX rate is machine-dependent.
44 1.12 thorpej */
45 1.12 thorpej #ifdef __alpha__
46 1.11 jonathan #define MC_DFEAULTRATE MC_RATE_1024_Hz
47 1.11 jonathan #endif
48 1.12 thorpej #ifdef pmax
49 1.11 jonathan #define MC_DEFAULTRATE MC_RATE_256_Hz
50 1.11 jonathan #endif
51 1.11 jonathan
52 1.11 jonathan
53 1.1 cgd void mcclock_init __P((struct device *));
54 1.1 cgd void mcclock_get __P((struct device *, time_t, struct clocktime *));
55 1.1 cgd void mcclock_set __P((struct device *, struct clocktime *));
56 1.1 cgd
57 1.1 cgd const struct clockfns mcclock_clockfns = {
58 1.1 cgd mcclock_init, mcclock_get, mcclock_set,
59 1.1 cgd };
60 1.1 cgd
61 1.1 cgd #define mc146818_write(dev, reg, datum) \
62 1.1 cgd (*(dev)->sc_busfns->mc_bf_write)(dev, reg, datum)
63 1.1 cgd #define mc146818_read(dev, reg) \
64 1.1 cgd (*(dev)->sc_busfns->mc_bf_read)(dev, reg)
65 1.1 cgd
66 1.1 cgd void
67 1.1 cgd mcclock_attach(sc, busfns)
68 1.1 cgd struct mcclock_softc *sc;
69 1.1 cgd const struct mcclock_busfns *busfns;
70 1.1 cgd {
71 1.1 cgd
72 1.4 christos printf(": mc146818 or compatible");
73 1.1 cgd
74 1.1 cgd sc->sc_busfns = busfns;
75 1.1 cgd
76 1.1 cgd /* Turn interrupts off, just in case. */
77 1.1 cgd mc146818_write(sc, MC_REGB, MC_REGB_BINARY | MC_REGB_24HR);
78 1.1 cgd
79 1.1 cgd clockattach(&sc->sc_dev, &mcclock_clockfns);
80 1.1 cgd }
81 1.1 cgd
82 1.1 cgd void
83 1.1 cgd mcclock_init(dev)
84 1.1 cgd struct device *dev;
85 1.1 cgd {
86 1.1 cgd struct mcclock_softc *sc = (struct mcclock_softc *)dev;
87 1.1 cgd
88 1.11 jonathan mc146818_write(sc, MC_REGA, MC_BASE_32_KHz | MC_DEFAULTRATE);
89 1.1 cgd mc146818_write(sc, MC_REGB,
90 1.5 cgd MC_REGB_PIE | MC_REGB_SQWE | MC_REGB_BINARY | MC_REGB_24HR);
91 1.1 cgd }
92 1.1 cgd
93 1.1 cgd /*
94 1.1 cgd * Get the time of day, based on the clock's value and/or the base value.
95 1.1 cgd */
96 1.1 cgd void
97 1.1 cgd mcclock_get(dev, base, ct)
98 1.1 cgd struct device *dev;
99 1.1 cgd time_t base;
100 1.1 cgd struct clocktime *ct;
101 1.1 cgd {
102 1.1 cgd struct mcclock_softc *sc = (struct mcclock_softc *)dev;
103 1.1 cgd mc_todregs regs;
104 1.1 cgd int s;
105 1.1 cgd
106 1.1 cgd s = splclock();
107 1.1 cgd MC146818_GETTOD(sc, ®s)
108 1.1 cgd splx(s);
109 1.1 cgd
110 1.1 cgd ct->sec = regs[MC_SEC];
111 1.1 cgd ct->min = regs[MC_MIN];
112 1.1 cgd ct->hour = regs[MC_HOUR];
113 1.1 cgd ct->dow = regs[MC_DOW];
114 1.1 cgd ct->day = regs[MC_DOM];
115 1.1 cgd ct->mon = regs[MC_MONTH];
116 1.1 cgd ct->year = regs[MC_YEAR];
117 1.1 cgd }
118 1.1 cgd
119 1.1 cgd /*
120 1.1 cgd * Reset the TODR based on the time value.
121 1.1 cgd */
122 1.1 cgd void
123 1.1 cgd mcclock_set(dev, ct)
124 1.1 cgd struct device *dev;
125 1.1 cgd struct clocktime *ct;
126 1.1 cgd {
127 1.1 cgd struct mcclock_softc *sc = (struct mcclock_softc *)dev;
128 1.1 cgd mc_todregs regs;
129 1.1 cgd int s;
130 1.1 cgd
131 1.1 cgd s = splclock();
132 1.1 cgd MC146818_GETTOD(sc, ®s);
133 1.1 cgd splx(s);
134 1.1 cgd
135 1.1 cgd regs[MC_SEC] = ct->sec;
136 1.1 cgd regs[MC_MIN] = ct->min;
137 1.1 cgd regs[MC_HOUR] = ct->hour;
138 1.1 cgd regs[MC_DOW] = ct->dow;
139 1.1 cgd regs[MC_DOM] = ct->day;
140 1.1 cgd regs[MC_MONTH] = ct->mon;
141 1.1 cgd regs[MC_YEAR] = ct->year;
142 1.1 cgd
143 1.1 cgd s = splclock();
144 1.1 cgd MC146818_PUTTOD(sc, ®s);
145 1.1 cgd splx(s);
146 1.1 cgd }
147