FreeBSD/Linux Kernel Cross Reference
sys/dev/dec/mcclock.c
1 /* $NetBSD: mcclock.c,v 1.15 2001/12/05 10:54:51 simonb Exp $ */
2
3 /*
4 * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
5 * All rights reserved.
6 *
7 * Author: Chris G. Demetriou
8 *
9 * Permission to use, copy, modify and distribute this software and
10 * its documentation is hereby granted, provided that both the copyright
11 * notice and this permission notice appear in all copies of the
12 * software, derivative works or modified versions, and any portions
13 * thereof, and that both notices appear in supporting documentation.
14 *
15 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
16 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
17 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
18 *
19 * Carnegie Mellon requests users of this software to return to
20 *
21 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
22 * School of Computer Science
23 * Carnegie Mellon University
24 * Pittsburgh PA 15213-3890
25 *
26 * any improvements or extensions that they make and grant Carnegie the
27 * rights to redistribute these changes.
28 */
29
30 #include <sys/cdefs.h>
31 __KERNEL_RCSID(0, "$NetBSD: mcclock.c,v 1.15 2001/12/05 10:54:51 simonb Exp $");
32
33 #include <sys/param.h>
34 #include <sys/kernel.h>
35 #include <sys/systm.h>
36 #include <sys/device.h>
37
38 #include <dev/dec/clockvar.h>
39 #include <dev/dec/mcclockvar.h>
40 #include <dev/ic/mc146818reg.h>
41
42 /*
43 * XXX default rate is machine-dependent.
44 */
45 #ifdef __alpha__
46 #define MC_DFEAULTHZ 1024
47 #endif
48 #ifdef pmax
49 #define MC_DEFAULTHZ 256
50 #endif
51
52
53 void mcclock_init __P((struct device *));
54 void mcclock_get __P((struct device *, time_t, struct clocktime *));
55 void mcclock_set __P((struct device *, struct clocktime *));
56
57 const struct clockfns mcclock_clockfns = {
58 mcclock_init, mcclock_get, mcclock_set,
59 };
60
61 #define mc146818_write(dev, reg, datum) \
62 (*(dev)->sc_busfns->mc_bf_write)(dev, reg, datum)
63 #define mc146818_read(dev, reg) \
64 (*(dev)->sc_busfns->mc_bf_read)(dev, reg)
65
66 void
67 mcclock_attach(sc, busfns)
68 struct mcclock_softc *sc;
69 const struct mcclock_busfns *busfns;
70 {
71
72 printf(": mc146818 or compatible");
73
74 sc->sc_busfns = busfns;
75
76 /* Turn interrupts off, just in case. */
77 mc146818_write(sc, MC_REGB, MC_REGB_BINARY | MC_REGB_24HR);
78
79 clockattach(&sc->sc_dev, &mcclock_clockfns);
80 }
81
82 void
83 mcclock_init(dev)
84 struct device *dev;
85 {
86 struct mcclock_softc *sc = (struct mcclock_softc *)dev;
87 int rate;
88
89 again:
90 switch (hz) {
91 case 32:
92 rate = MC_BASE_32_KHz | MC_RATE_32_Hz;
93 break;
94 case 64:
95 rate = MC_BASE_32_KHz | MC_RATE_64_Hz;
96 break;
97 case 128:
98 rate = MC_BASE_32_KHz | MC_RATE_128_Hz;
99 break;
100 case 256:
101 rate = MC_BASE_32_KHz | MC_RATE_256_Hz;
102 break;
103 case 512:
104 rate = MC_BASE_32_KHz | MC_RATE_512_Hz;
105 break;
106 case 1024:
107 rate = MC_BASE_32_KHz | MC_RATE_1024_Hz;
108 break;
109 case 2048:
110 rate = MC_BASE_32_KHz | MC_RATE_2048_Hz;
111 break;
112 case 4096:
113 rate = MC_BASE_32_KHz | MC_RATE_4096_Hz;
114 break;
115 case 8192:
116 rate = MC_BASE_32_KHz | MC_RATE_8192_Hz;
117 break;
118 case 16384:
119 rate = MC_BASE_4_MHz | MC_RATE_1;
120 break;
121 case 32768:
122 rate = MC_BASE_4_MHz | MC_RATE_2;
123 break;
124 default:
125 printf("%s: Cannot get %d Hz clock; using %d Hz\n",
126 sc->sc_dev.dv_xname, hz, MC_DEFAULTHZ);
127 hz = MC_DEFAULTHZ;
128 goto again;
129 }
130 mc146818_write(sc, MC_REGA, rate);
131 mc146818_write(sc, MC_REGB,
132 MC_REGB_PIE | MC_REGB_SQWE | MC_REGB_BINARY | MC_REGB_24HR);
133 }
134
135 /*
136 * Get the time of day, based on the clock's value and/or the base value.
137 */
138 void
139 mcclock_get(dev, base, ct)
140 struct device *dev;
141 time_t base;
142 struct clocktime *ct;
143 {
144 struct mcclock_softc *sc = (struct mcclock_softc *)dev;
145 mc_todregs regs;
146 int s;
147
148 s = splclock();
149 MC146818_GETTOD(sc, ®s)
150 splx(s);
151
152 ct->sec = regs[MC_SEC];
153 ct->min = regs[MC_MIN];
154 ct->hour = regs[MC_HOUR];
155 ct->dow = regs[MC_DOW];
156 ct->day = regs[MC_DOM];
157 ct->mon = regs[MC_MONTH];
158 ct->year = regs[MC_YEAR];
159 }
160
161 /*
162 * Reset the TODR based on the time value.
163 */
164 void
165 mcclock_set(dev, ct)
166 struct device *dev;
167 struct clocktime *ct;
168 {
169 struct mcclock_softc *sc = (struct mcclock_softc *)dev;
170 mc_todregs regs;
171 int s;
172
173 s = splclock();
174 MC146818_GETTOD(sc, ®s);
175 splx(s);
176
177 regs[MC_SEC] = ct->sec;
178 regs[MC_MIN] = ct->min;
179 regs[MC_HOUR] = ct->hour;
180 regs[MC_DOW] = ct->dow;
181 regs[MC_DOM] = ct->day;
182 regs[MC_MONTH] = ct->mon;
183 regs[MC_YEAR] = ct->year;
184
185 s = splclock();
186 MC146818_PUTTOD(sc, ®s);
187 splx(s);
188 }
Cache object: 655068935a68ef9916bc7d099c800024
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