xref: /netbsd/sys/arch/cobalt/dev/mcclock.c (revision 6550d01e)
1 /*	$NetBSD: mcclock.c,v 1.4 2008/03/29 05:42:45 tsutsui Exp $	*/
2 
3 /*
4  * Copyright (c) 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 1.4 2008/03/29 05:42:45 tsutsui Exp $");
32 
33 #include <sys/cdefs.h>			/* RCS ID & Copyright macro defns */
34 
35 #include <sys/param.h>
36 #include <sys/kernel.h>
37 #include <sys/systm.h>
38 #include <sys/device.h>
39 
40 #include <machine/autoconf.h>
41 #include <machine/bus.h>
42 
43 #include <dev/clock_subr.h>
44 #include <dev/ic/mc146818reg.h>
45 #include <dev/ic/mc146818var.h>
46 
47 #define	MCCLOCK_NPORTS	2
48 
49 static int mcclock_match(device_t, cfdata_t, void *);
50 static void mcclock_attach(device_t, device_t, void *);
51 
52 CFATTACH_DECL_NEW(mcclock, sizeof (struct mc146818_softc),
53     mcclock_match, mcclock_attach, NULL, NULL);
54 
55 static void mcclock_write(struct mc146818_softc *, u_int, u_int);
56 static u_int mcclock_read(struct mc146818_softc *, u_int);
57 
58 
59 static int
60 mcclock_match(device_t parent, cfdata_t cf, void *aux)
61 {
62 	static int mcclock_found;
63 
64 	if (mcclock_found)
65 		return 0;
66 
67 	mcclock_found = 1;
68 
69 	return 1;
70 }
71 
72 static void
73 mcclock_attach(device_t parent, device_t self, void *aux)
74 {
75 	struct mc146818_softc *sc = device_private(self);
76 	struct mainbus_attach_args *ma = aux;
77 
78 	sc->sc_dev = self;
79 	sc->sc_bst = ma->ma_iot;
80 	if (bus_space_map(sc->sc_bst, ma->ma_addr, MCCLOCK_NPORTS,
81 	    0, &sc->sc_bsh)) {
82 		aprint_error("mcclock_attach: unable to map registers\n");
83 		return;
84 	}
85 
86 	sc->sc_year0 = 2000;
87 	sc->sc_mcread = mcclock_read;
88 	sc->sc_mcwrite = mcclock_write;
89 	sc->sc_flag = MC146818_BCD;
90 	mc146818_attach(sc);
91 
92 	aprint_normal("\n");
93 
94 	(*sc->sc_mcwrite)(sc, MC_REGB, MC_REGB_24HR);
95 }
96 
97 static void
98 mcclock_write(struct mc146818_softc *sc, u_int reg, u_int datum)
99 {
100 	bus_space_tag_t iot;
101 	bus_space_handle_t ioh;
102 
103 	iot = sc->sc_bst;
104 	ioh = sc->sc_bsh;
105 
106 	bus_space_write_1(iot, ioh, 0, reg);
107 	bus_space_write_1(iot, ioh, 1, datum);
108 }
109 
110 static u_int
111 mcclock_read(struct mc146818_softc *sc, u_int reg)
112 {
113 	bus_space_tag_t iot;
114 	bus_space_handle_t ioh;
115 	u_int datum;
116 
117 	iot = sc->sc_bst;
118 	ioh = sc->sc_bsh;
119 
120 	bus_space_write_1(iot, ioh, 0, reg);
121 	datum = bus_space_read_1(iot, ioh, 1);
122 
123 	return datum;
124 }
125