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 <sys/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
49static int mcclock_match(device_t, cfdata_t, void *);
50static void mcclock_attach(device_t, device_t, void *);
51
52CFATTACH_DECL_NEW(mcclock, sizeof (struct mc146818_softc),
53    mcclock_match, mcclock_attach, NULL, NULL);
54
55static void mcclock_write(struct mc146818_softc *, u_int, u_int);
56static u_int mcclock_read(struct mc146818_softc *, u_int);
57
58
59static int
60mcclock_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
72static void
73mcclock_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
97static void
98mcclock_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
110static u_int
111mcclock_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