mkclock_pnpbus.c revision 1.4 
1/* $NetBSD: mkclock_pnpbus.c,v 1.4 2008/03/29 06:16:54 tsutsui 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 * Mostek MK48T18 time-of-day chip attachment to pnpbus, using two
40 * 8-bit ports for address selection and one 8-bit port for data.
41 *
42 * Note that this is essentially a stub driver. We cannot attach the clock
43 * with this driver because the clock and nvram part are one in the same, and
44 * share the same IO ports.  If we attach the clock, the NVRAM driver will
45 * fail to attach.  Instead, we note that we have an mk48txx device, and in
46 * the nvram driver, we will attach the clock goop there.
47 *
48 * Therefore the probe will always fail.
49 */
50
51#include <sys/cdefs.h>
52__KERNEL_RCSID(0, "$NetBSD: mkclock_pnpbus.c,v 1.4 2008/03/29 06:16:54 tsutsui Exp $");
53
54#include <sys/param.h>
55#include <sys/kernel.h>
56#include <sys/systm.h>
57#include <sys/device.h>
58
59#include <machine/bus.h>
60#include <machine/residual.h>
61#include <machine/chpidpnp.h>
62
63#include <dev/isa/isavar.h>
64#include <prep/pnpbus/pnpbusvar.h>
65
66extern int prep_clock_mk48txx;
67
68static int	mkclock_pnpbus_probe(device_t, cfdata_t, void *);
69
70CFATTACH_DECL_NEW(mkclock_pnpbus, 0, mkclock_pnpbus_probe, NULL, NULL, NULL);
71
72static int
73mkclock_pnpbus_probe(device_t parent, cfdata_t cf, void *aux)
74{
75	struct pnpbus_dev_attach_args *pna = aux;
76
77	if (strcmp(pna->pna_devid, "PNP0B00") == 0 &&
78	    pna->subtype == RealTimeClock && pna->chipid == MOTmk48)
79		prep_clock_mk48txx = 1;
80
81	return 0;
82}
83