1 /* $NetBSD: bus_space.c,v 1.3 2019/12/14 02:58:20 tsutsui 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 1.3 2019/12/14 02:58:20 tsutsui Exp $");
39
40 #include <sys/param.h>
41 #include <sys/systm.h>
42
43 #include <machine/bus.h>
44
45 /* ARGSUSED */
46 int
bus_space_map(bus_space_tag_t t,bus_addr_t bpa,bus_size_t size,int flags,bus_space_handle_t * bshp)47 bus_space_map(
48 bus_space_tag_t t,
49 bus_addr_t bpa,
50 bus_size_t size,
51 int flags,
52 bus_space_handle_t *bshp)
53 {
54 int cacheable = flags & BUS_SPACE_MAP_CACHEABLE;
55
56 /* Mappings on the DECstation are always linear. */
57 if (cacheable)
58 *bshp = MIPS_PHYS_TO_KSEG0(bpa);
59 else
60 *bshp = MIPS_PHYS_TO_KSEG1(bpa);
61 return (0);
62 }
63
64 /* ARGSUSED */
65 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)66 bus_space_alloc(
67 bus_space_tag_t t,
68 bus_addr_t rstart,
69 bus_addr_t rend,
70 bus_size_t size,
71 bus_size_t alignment,
72 bus_size_t boundary,
73 int flags,
74 bus_addr_t *bpap,
75 bus_space_handle_t *bshp)
76 {
77
78 /*
79 * Not meaningful on any currently-supported DECstation bus.
80 */
81 return (EINVAL);
82 }
83
84 /* ARGSUSED */
85 void
bus_space_free(bus_space_tag_t t,bus_space_handle_t bsh,bus_size_t size)86 bus_space_free(
87 bus_space_tag_t t,
88 bus_space_handle_t bsh,
89 bus_size_t size)
90 {
91
92 /*
93 * Not meaningful on any currently-supported DECstation bus.
94 */
95 panic("bus_space_free: shouldn't be here");
96 }
97
98 void
bus_space_unmap(bus_space_tag_t t,bus_space_handle_t bsh,bus_size_t size)99 bus_space_unmap(
100 bus_space_tag_t t,
101 bus_space_handle_t bsh,
102 bus_size_t size)
103 {
104
105 /* Nothing to do. */
106 }
107
108 /* ARGSUSED */
109 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)110 bus_space_subregion(
111 bus_space_tag_t t,
112 bus_space_handle_t bsh,
113 bus_size_t offset,
114 bus_size_t size,
115 bus_space_handle_t *nbshp)
116 {
117
118 *nbshp = bsh + offset;
119 return (0);
120 }
121