mcclock_isa.c revision 1.3 
1/*	$NetBSD: mcclock_isa.c,v 1.3 1996/10/23 04:12:19 cgd 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/param.h>
31#include <sys/kernel.h>
32#include <sys/systm.h>
33#include <sys/device.h>
34
35#include <machine/bus.h>
36
37#include <alpha/alpha/clockvar.h>
38#include <alpha/alpha/mcclockvar.h>
39#include <dev/ic/mc146818reg.h>
40#include <dev/isa/isavar.h>
41
42struct mcclock_isa_softc {
43	struct mcclock_softc	sc_mcclock;
44
45	bus_space_tag_t		sc_iot;
46	bus_space_handle_t	sc_ioh;
47};
48
49int	mcclock_isa_match __P((struct device *, void *, void *));
50void	mcclock_isa_attach __P((struct device *, struct device *, void *));
51
52struct cfattach mcclock_isa_ca = {
53	sizeof (struct mcclock_isa_softc), mcclock_isa_match,
54	    mcclock_isa_attach,
55};
56
57void	mcclock_isa_write __P((struct mcclock_softc *, u_int, u_int));
58u_int	mcclock_isa_read __P((struct mcclock_softc *, u_int));
59
60const struct mcclock_busfns mcclock_isa_busfns = {
61	mcclock_isa_write, mcclock_isa_read,
62};
63
64int
65mcclock_isa_match(parent, match, aux)
66	struct device *parent;
67	void *match, *aux;
68{
69	struct isa_attach_args *ia = aux;
70
71	if (ia->ia_iobase != 0x70 && ia->ia_iobase != -1)
72		return (0);
73
74	ia->ia_iobase = 0x70;		/* XXX */
75	ia->ia_iosize = 2;		/* XXX */
76	ia->ia_msize = 0;
77
78	return (1);
79}
80
81void
82mcclock_isa_attach(parent, self, aux)
83	struct device *parent, *self;
84	void *aux;
85{
86	struct isa_attach_args *ia = aux;
87	struct mcclock_isa_softc *sc = (struct mcclock_isa_softc *)self;
88
89	sc->sc_iot = ia->ia_iot;
90	if (bus_space_map(sc->sc_iot, ia->ia_iobase, ia->ia_iosize, 0,
91	    &sc->sc_ioh))
92		panic("mcclock_isa_attach: couldn't map clock I/O space");
93
94	mcclock_attach(&sc->sc_mcclock, &mcclock_isa_busfns);
95}
96
97void
98mcclock_isa_write(mcsc, reg, datum)
99	struct mcclock_softc *mcsc;
100	u_int reg, datum;
101{
102	struct mcclock_isa_softc *sc = (struct mcclock_isa_softc *)mcsc;
103	bus_space_tag_t iot = sc->sc_iot;
104	bus_space_handle_t ioh = sc->sc_ioh;
105
106	bus_space_write_1(iot, ioh, 0, reg);
107	bus_space_write_1(iot, ioh, 1, datum);
108}
109
110u_int
111mcclock_isa_read(mcsc, reg)
112	struct mcclock_softc *mcsc;
113	u_int reg;
114{
115	struct mcclock_isa_softc *sc = (struct mcclock_isa_softc *)mcsc;
116	bus_space_tag_t iot = sc->sc_iot;
117	bus_space_handle_t ioh = sc->sc_ioh;
118
119	bus_space_write_1(iot, ioh, 0, reg);
120	return bus_space_read_1(iot, ioh, 1);
121}
122