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
bus_space_map(bus_space_tag_t t,bus_addr_t bpa,bus_size_t size,int flags,bus_space_handle_t * bshp)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
bus_space_alloc(bus_space_tag_t t,bus_addr_t rstart,bus_addr_t rend,bus_size_t size,bus_size_t alignment,bus_size_t boundary,int flags,bus_addr_t * bpap,bus_space_handle_t * bshp)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
bus_space_free(bus_space_tag_t t,bus_space_handle_t bsh,bus_size_t size)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
bus_space_unmap(bus_space_tag_t t,bus_space_handle_t bsh,bus_size_t size)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
bus_space_subregion(bus_space_tag_t t,bus_space_handle_t bsh,bus_size_t offset,bus_size_t size,bus_space_handle_t * nbshp)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