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      1 /*	$NetBSD: bus_space.c,v 1.8 2011/07/09 17:32:30 matt Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1998 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
      9  * NASA Ames Research Center.
     10  *
     11  * Redistribution and use in source and binary forms, with or without
     12  * modification, are permitted provided that the following conditions
     13  * are met:
     14  * 1. Redistributions of source code must retain the above copyright
     15  *    notice, this list of conditions and the following disclaimer.
     16  * 2. Redistributions in binary form must reproduce the above copyright
     17  *    notice, this list of conditions and the following disclaimer in the
     18  *    documentation and/or other materials provided with the distribution.
     19  *
     20  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     22  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     24  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     30  * POSSIBILITY OF SUCH DAMAGE.
     31  */
     32 
     33 /*
     34  * Implementation of bus_space mapping for the DECstation.
     35  */
     36 
     37 #include <sys/cdefs.h>
     38 __KERNEL_RCSID(0, "$NetBSD: bus_space.c,v 1.8 2011/07/09 17:32:30 matt Exp $");
     39 
     40 #include <sys/param.h>
     41 #include <sys/bus.h>
     42 #include <sys/systm.h>
     43 
     44 /* ARGSUSED */
     45 int
     46 bus_space_map(bus_space_tag_t t, bus_addr_t bpa, bus_size_t size, int flags,
     47     bus_space_handle_t *bshp)
     48 {
     49 	int cacheable = flags & BUS_SPACE_MAP_CACHEABLE;
     50 
     51 	/* Mappings on the DECstation are always linear. */
     52 	if (cacheable)
     53 		*bshp = MIPS_PHYS_TO_KSEG0(bpa);
     54 	else
     55 		*bshp = MIPS_PHYS_TO_KSEG1(bpa);
     56 	return 0;
     57 }
     58 
     59 /* ARGSUSED */
     60 int
     61 bus_space_alloc(bus_space_tag_t t, bus_addr_t rstart, bus_addr_t rend,
     62     bus_size_t size, bus_size_t alignment, bus_size_t boundary,
     63     int flags, bus_addr_t *bpap, bus_space_handle_t *bshp)
     64 {
     65 
     66 	/*
     67 	 * Not meaningful on any currently-supported DECstation bus.
     68 	 */
     69 	return EINVAL;
     70 }
     71 
     72 /* ARGSUSED */
     73 void
     74 bus_space_free(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t size)
     75 {
     76 
     77 	/*
     78 	 * Not meaningful on any currently-supported DECstation bus.
     79 	 */
     80 	panic("bus_space_free: shouldn't be here");
     81 }
     82 
     83 void
     84 bus_space_unmap(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t size)
     85 {
     86 
     87 	/* Nothing to do. */
     88 }
     89 
     90 /* ARGSUSED */
     91 int
     92 bus_space_subregion(bus_space_tag_t t, bus_space_handle_t bsh,
     93     bus_size_t offset, bus_size_t size, bus_space_handle_t *nbshp)
     94 {
     95 
     96 	*nbshp = bsh + offset;
     97 	return 0;
     98 }
     99