mcclock_mainbus.c revision 1.9 
1/*	$NetBSD: mcclock_mainbus.c,v 1.9 2008/03/28 19:05:49 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>			/* RCS ID & Copyright macro defns */
31
32__KERNEL_RCSID(0, "$NetBSD: mcclock_mainbus.c,v 1.9 2008/03/28 19:05:49 tsutsui Exp $");
33
34#include <sys/param.h>
35#include <sys/kernel.h>
36#include <sys/systm.h>
37#include <sys/device.h>
38
39#include <machine/autoconf.h>
40#include <machine/bus.h>
41
42#include <dev/clock_subr.h>
43#include <dev/ic/mc146818reg.h>
44#include <dev/ic/mc146818var.h>
45
46int	mcclock_mainbus_match(device_t, cfdata_t, void *);
47void	mcclock_mainbus_attach(device_t, device_t, void *);
48
49CFATTACH_DECL_NEW(mcclock_mainbus, sizeof(struct mc146818_softc),
50    mcclock_mainbus_match, mcclock_mainbus_attach, NULL, NULL);
51
52void	mcclock_mainbus_write(struct mc146818_softc *, u_int, u_int);
53u_int	mcclock_mainbus_read(struct mc146818_softc *, u_int);
54
55int
56mcclock_mainbus_match(device_t parent, cfdata_t cf, void *aux)
57{
58	struct mainbus_attach_args *ma = aux;
59
60	if (strcmp(ma->ma_name, cf->cf_name) == 0)
61		return (1);
62
63	return (0);
64}
65
66void
67mcclock_mainbus_attach(device_t parent, device_t self, void *aux)
68{
69	struct mc146818_softc *sc = device_private(self);
70	struct mainbus_attach_args *ma = aux;
71
72	sc->sc_bst = ma->ma_st;
73	if (bus_space_map(sc->sc_bst, ma->ma_addr, 2, 0, &sc->sc_bsh))
74		panic("mcclock_mainbus_attach: couldn't map clock I/O space");
75
76	/*
77	 * Turn interrupts off, just in case.  Need to leave the SQWE
78	 * set, because that's the DRAM refresh signal on Rev. B boards.
79	 */
80	mcclock_mainbus_write(sc, MC_REGB, MC_REGB_SQWE | MC_REGB_BINARY |
81	    MC_REGB_24HR);
82
83	sc->sc_mcread = mcclock_mainbus_read;
84	sc->sc_mcwrite = mcclock_mainbus_write;
85	sc->sc_getcent = NULL;
86	sc->sc_setcent = NULL;
87	sc->sc_flag = 0;
88
89	/* Algor uses year 1980 as offset */
90	sc->sc_year0 = 1980;
91
92	mc146818_attach(sc);
93
94	aprint_normal("\n");
95}
96
97void
98mcclock_mainbus_write(struct mc146818_softc *sc, u_int reg, u_int datum)
99{
100	bus_space_tag_t iot = sc->sc_bst;
101	bus_space_handle_t ioh = sc->sc_bsh;
102
103	bus_space_write_1(iot, ioh, 0, reg);
104	bus_space_write_1(iot, ioh, 1, datum);
105}
106
107u_int
108mcclock_mainbus_read(struct mc146818_softc *sc, u_int reg)
109{
110	bus_space_tag_t iot = sc->sc_bst;
111	bus_space_handle_t ioh = sc->sc_bsh;
112
113	bus_space_write_1(iot, ioh, 0, reg);
114	return bus_space_read_1(iot, ioh, 1);
115}
116