1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2009, Oleksandr Tymoshenko <gonzo@FreeBSD.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice unmodified, this list of conditions, and the following
12 * disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
31
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/bus.h>
35
36 #include <machine/bus.h>
37 #include <mips/atheros/ar71xx_bus_space_reversed.h>
38
39 static bs_r_1_proto(reversed);
40 static bs_r_2_proto(reversed);
41 static bs_w_1_proto(reversed);
42 static bs_w_2_proto(reversed);
43
44 /*
45 * Bus space that handles offsets in word for 1/2 bytes read/write access.
46 * Byte order of values is handled by device drivers itself.
47 */
48 static struct bus_space bus_space_reversed = {
49 /* cookie */
50 (void *) 0,
51
52 /* mapping/unmapping */
53 generic_bs_map,
54 generic_bs_unmap,
55 generic_bs_subregion,
56
57 /* allocation/deallocation */
58 NULL,
59 NULL,
60
61 /* barrier */
62 generic_bs_barrier,
63
64 /* read (single) */
65 reversed_bs_r_1,
66 reversed_bs_r_2,
67 generic_bs_r_4,
68 NULL,
69
70 /* read multiple */
71 generic_bs_rm_1,
72 generic_bs_rm_2,
73 generic_bs_rm_4,
74 NULL,
75
76 /* read region */
77 generic_bs_rr_1,
78 generic_bs_rr_2,
79 generic_bs_rr_4,
80 NULL,
81
82 /* write (single) */
83 reversed_bs_w_1,
84 reversed_bs_w_2,
85 generic_bs_w_4,
86 NULL,
87
88 /* write multiple */
89 generic_bs_wm_1,
90 generic_bs_wm_2,
91 generic_bs_wm_4,
92 NULL,
93
94 /* write region */
95 NULL,
96 generic_bs_wr_2,
97 generic_bs_wr_4,
98 NULL,
99
100 /* set multiple */
101 NULL,
102 NULL,
103 NULL,
104 NULL,
105
106 /* set region */
107 NULL,
108 generic_bs_sr_2,
109 generic_bs_sr_4,
110 NULL,
111
112 /* copy */
113 NULL,
114 generic_bs_c_2,
115 NULL,
116 NULL,
117
118 /* read (single) stream */
119 generic_bs_r_1,
120 generic_bs_r_2,
121 generic_bs_r_4,
122 NULL,
123
124 /* read multiple stream */
125 generic_bs_rm_1,
126 generic_bs_rm_2,
127 generic_bs_rm_4,
128 NULL,
129
130 /* read region stream */
131 generic_bs_rr_1,
132 generic_bs_rr_2,
133 generic_bs_rr_4,
134 NULL,
135
136 /* write (single) stream */
137 generic_bs_w_1,
138 generic_bs_w_2,
139 generic_bs_w_4,
140 NULL,
141
142 /* write multiple stream */
143 generic_bs_wm_1,
144 generic_bs_wm_2,
145 generic_bs_wm_4,
146 NULL,
147
148 /* write region stream */
149 NULL,
150 generic_bs_wr_2,
151 generic_bs_wr_4,
152 NULL,
153 };
154
155 bus_space_tag_t ar71xx_bus_space_reversed = &bus_space_reversed;
156
157 static uint8_t
158 reversed_bs_r_1(void *t, bus_space_handle_t h, bus_size_t o)
159 {
160
161 return readb(h + (o &~ 3) + (3 - (o & 3)));
162 }
163
164 static void
165 reversed_bs_w_1(void *t, bus_space_handle_t h, bus_size_t o, u_int8_t v)
166 {
167
168 writeb(h + (o &~ 3) + (3 - (o & 3)), v);
169 }
170
171 static uint16_t
172 reversed_bs_r_2(void *t, bus_space_handle_t h, bus_size_t o)
173 {
174
175 return readw(h + (o &~ 3) + (2 - (o & 3)));
176 }
177
178 static void
179 reversed_bs_w_2(void *t, bus_space_handle_t h, bus_size_t o, uint16_t v)
180 {
181
182 writew(h + (o &~ 3) + (2 - (o & 3)), v);
183 }
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