/*-
* Copyright (c) 1996, 1997 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
* NASA Ames Research Center and by Christos Zoulas.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Machine-dependent portions of ISA PnP bus autoconfiguration.
*
* N.B. This file exists mostly to get around some lameness surrounding
* the PnP spec. ISA PnP registers live where some `normal' ISA
* devices do, but are e.g. write-only registers where the normal
* device has a read-only register. This breaks in the presence of
* i/o port accounting. This file takes care of mapping ISA PnP
* registers without actually allocating them in extent maps.
*
* Since this is a machine-dependent file, we make all sorts of
* assumptions about bus.h's guts. Beware!
*/
/* isapnp_unmap():
* Unmap I/O regions used by PnP
*/
void
isapnp_unmap(struct isapnp_softc *sc)
{
/* Do nothing. */
}
/* isapnp_map_readport():
* Called to map the PnP `read port', which is mapped independently
* of the `write' and `addr' ports.
*
* NOTE: assumes the caller has filled in sc->sc_read_port!
*/
int
isapnp_map_readport(struct isapnp_softc *sc)
{
#ifdef _KERNEL
int error;
#endif
#ifdef DIAGNOSTIC
if (!bus_space_is_equal(sc->sc_iot, x86_bus_space_io))
panic("isapnp_map_readport: bogus bus space tag");
#endif
#ifdef _KERNEL
/* Check if some other device has already claimed this port. */
if ((error = bus_space_map(sc->sc_iot, sc->sc_read_port, 1, 0,
&sc->sc_read_ioh)) != 0)
return error;
/*
* XXX: We unmap the port because it can and will be used by other
* devices such as a joystick. We need a better port accounting
* scheme with read and write ports.
*/
bus_space_unmap(sc->sc_iot, sc->sc_read_ioh, 1);
#endif
return 0;
}
/* isapnp_unmap_readport():
* Pretend to unmap a previously mapped `read port'.
*/
void
isapnp_unmap_readport(struct isapnp_softc *sc)
{
