76 lines
2.8 KiB
C
76 lines
2.8 KiB
C
/* $NetBSD: mkclock_pnpbus.c,v 1.6 2011/07/01 16:55:42 dyoung Exp $ */
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/*-
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* Copyright (c) 2006 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Tim Rightnour
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Mostek MK48T18 time-of-day chip attachment to pnpbus, using two
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* 8-bit ports for address selection and one 8-bit port for data.
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*
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* Note that this is essentially a stub driver. We cannot attach the clock
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* with this driver because the clock and nvram part are one in the same, and
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* share the same IO ports. If we attach the clock, the NVRAM driver will
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* fail to attach. Instead, we note that we have an mk48txx device, and in
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* the nvram driver, we will attach the clock goop there.
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*
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* Therefore the probe will always fail.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: mkclock_pnpbus.c,v 1.6 2011/07/01 16:55:42 dyoung Exp $");
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/device.h>
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#include <sys/bus.h>
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#include <machine/residual.h>
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#include <machine/chpidpnp.h>
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#include <dev/isa/isavar.h>
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#include <prep/pnpbus/pnpbusvar.h>
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extern int prep_clock_mk48txx;
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static int mkclock_pnpbus_probe(device_t, cfdata_t, void *);
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CFATTACH_DECL_NEW(mkclock_pnpbus, 0, mkclock_pnpbus_probe, NULL, NULL, NULL);
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static int
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mkclock_pnpbus_probe(device_t parent, cfdata_t cf, void *aux)
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{
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struct pnpbus_dev_attach_args *pna = aux;
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if (strcmp(pna->pna_devid, "PNP0B00") == 0 &&
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pna->subtype == RealTimeClock && pna->chipid == MOTmk48)
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prep_clock_mk48txx = 1;
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return 0;
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}
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