mcclock_pnpbus.c revision 1.1 
1/* $NetBSD: mcclock_pnpbus.c,v 1.1 2006/06/15 18:15:32 garbled Exp $ */
2/*-
3 * Copyright (c) 2006 The NetBSD Foundation, Inc.
4 * All rights reserved.
5 *
6 * This code is derived from software contributed to The NetBSD Foundation
7 * by Tim Rightnour
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 *    must display the following acknowledgement:
19 *        This product includes software developed by the NetBSD
20 *        Foundation, Inc. and its contributors.
21 * 4. Neither the name of The NetBSD Foundation nor the names of its
22 *    contributors may be used to endorse or promote products derived
23 *    from this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
26 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
28 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35 * POSSIBILITY OF SUCH DAMAGE.
36 */
37
38/*
39 * PNPBus driver for the mc146818 compatible time-of-day clock found on all
40 * IBM Prep machines.  This one is only discernable from the motorola clock
41 * part by the interface portion of the residual data. (or by the small vendor
42 * item chip id)
43 * NOTE: The IBM machines actually have either a dallas 1385 or a dallas 1585
44 * chip.  This driver should probably be replaced by something that does that
45 * one day.
46 */
47
48#include <sys/cdefs.h>
49__KERNEL_RCSID(0, "$NetBSD: mcclock_pnpbus.c,v 1.1 2006/06/15 18:15:32 garbled Exp $");
50
51#include <sys/types.h>
52#include <sys/param.h>
53#include <sys/systm.h>
54#include <sys/device.h>
55#include <sys/malloc.h>
56
57#include <machine/bus.h>
58#include <machine/intr.h>
59#include <machine/isa_machdep.h>
60#include <machine/residual.h>
61
62#include <dev/clock_subr.h>
63#include <dev/ic/mc146818reg.h>
64#include <dev/ic/mc146818var.h>
65
66#include <dev/isa/isavar.h>
67
68#include <prep/pnpbus/pnpbusvar.h>
69
70static int	mcclock_pnpbus_probe(struct device *, struct cfdata *, void *);
71static void	mcclock_pnpbus_attach(struct device *, struct device *, void *);
72
73CFATTACH_DECL(mcclock_pnpbus, sizeof (struct mc146818_softc),
74    mcclock_pnpbus_probe, mcclock_pnpbus_attach, NULL, NULL);
75
76void	mcclock_pnpbus_write(struct mc146818_softc *, u_int, u_int);
77u_int	mcclock_pnpbus_read(struct mc146818_softc *, u_int);
78
79static int
80mcclock_pnpbus_probe(struct device *parent, struct cfdata *match, void *aux)
81{
82	struct pnpbus_dev_attach_args *pna = aux;
83	int ret = 0;
84
85	if (strcmp(pna->pna_devid, "PNP0B00") == 0 &&
86	    pna->subtype == RealTimeClock && pna->interface == ISA_RTC)
87		ret = 1;
88
89	if (ret)
90		pnpbus_scan(pna, pna->pna_ppc_dev);
91	return ret;
92}
93
94static void
95mcclock_pnpbus_attach(struct device *parent, struct device *self, void *aux)
96{
97	struct mc146818_softc *sc = (void *)self;
98	struct pnpbus_dev_attach_args *pna = aux;
99
100	sc->sc_bst = pna->pna_iot;
101	if (pnpbus_io_map(&pna->pna_res, 0, &sc->sc_bst, &sc->sc_bsh)) {
102		/* XXX should we panic instead? */
103		aprint_error("%s: couldn't map clock I/O space",
104		    device_xname(self));
105		return;
106	}
107
108	sc->sc_year0 = 1900;
109	sc->sc_mcread = mcclock_pnpbus_read;
110	sc->sc_mcwrite = mcclock_pnpbus_write;
111	sc->sc_flag = MC146818_BCD;
112	mc146818_attach(sc);
113
114	aprint_normal("\n");
115
116	(*sc->sc_mcwrite)(sc, MC_REGB, MC_REGB_24HR);
117	todr_attach(&sc->sc_handle);
118}
119
120void
121mcclock_pnpbus_write(struct mc146818_softc *sc, u_int reg, u_int datum)
122{
123	bus_space_tag_t iot;
124	bus_space_handle_t ioh;
125
126	iot = sc->sc_bst;
127	ioh = sc->sc_bsh;
128
129	bus_space_write_1(iot, ioh, 0, reg);
130	bus_space_write_1(iot, ioh, 1, datum);
131}
132
133u_int
134mcclock_pnpbus_read(struct mc146818_softc *sc, u_int reg)
135{
136	bus_space_tag_t iot;
137	bus_space_handle_t ioh;
138	u_int datum;
139
140	iot = sc->sc_bst;
141	ioh = sc->sc_bsh;
142
143	bus_space_write_1(iot, ioh, 0, reg);
144	datum = bus_space_read_1(iot, ioh, 1);
145
146	return (datum);
147}
148