1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
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 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/bus.h>
33
34 #include <machine/bus.h>
35 #include <mips/atheros/ar71xx_bus_space_reversed.h>
36
37 static bs_r_1_proto(reversed);
38 static bs_r_2_proto(reversed);
39 static bs_w_1_proto(reversed);
40 static bs_w_2_proto(reversed);
41
42 /*
43 * Bus space that handles offsets in word for 1/2 bytes read/write access.
44 * Byte order of values is handled by device drivers itself.
45 */
46 static struct bus_space bus_space_reversed = {
47 /* cookie */
48 (void *) 0,
49
50 /* mapping/unmapping */
51 generic_bs_map,
52 generic_bs_unmap,
53 generic_bs_subregion,
54
55 /* allocation/deallocation */
56 NULL,
57 NULL,
58
59 /* barrier */
60 generic_bs_barrier,
61
62 /* read (single) */
63 reversed_bs_r_1,
64 reversed_bs_r_2,
65 generic_bs_r_4,
66 NULL,
67
68 /* read multiple */
69 generic_bs_rm_1,
70 generic_bs_rm_2,
71 generic_bs_rm_4,
72 NULL,
73
74 /* read region */
75 generic_bs_rr_1,
76 generic_bs_rr_2,
77 generic_bs_rr_4,
78 NULL,
79
80 /* write (single) */
81 reversed_bs_w_1,
82 reversed_bs_w_2,
83 generic_bs_w_4,
84 NULL,
85
86 /* write multiple */
87 generic_bs_wm_1,
88 generic_bs_wm_2,
89 generic_bs_wm_4,
90 NULL,
91
92 /* write region */
93 NULL,
94 generic_bs_wr_2,
95 generic_bs_wr_4,
96 NULL,
97
98 /* set multiple */
99 NULL,
100 NULL,
101 NULL,
102 NULL,
103
104 /* set region */
105 NULL,
106 generic_bs_sr_2,
107 generic_bs_sr_4,
108 NULL,
109
110 /* copy */
111 NULL,
112 generic_bs_c_2,
113 NULL,
114 NULL,
115
116 /* read (single) stream */
117 generic_bs_r_1,
118 generic_bs_r_2,
119 generic_bs_r_4,
120 NULL,
121
122 /* read multiple stream */
123 generic_bs_rm_1,
124 generic_bs_rm_2,
125 generic_bs_rm_4,
126 NULL,
127
128 /* read region stream */
129 generic_bs_rr_1,
130 generic_bs_rr_2,
131 generic_bs_rr_4,
132 NULL,
133
134 /* write (single) stream */
135 generic_bs_w_1,
136 generic_bs_w_2,
137 generic_bs_w_4,
138 NULL,
139
140 /* write multiple stream */
141 generic_bs_wm_1,
142 generic_bs_wm_2,
143 generic_bs_wm_4,
144 NULL,
145
146 /* write region stream */
147 NULL,
148 generic_bs_wr_2,
149 generic_bs_wr_4,
150 NULL,
151 };
152
153 bus_space_tag_t ar71xx_bus_space_reversed = &bus_space_reversed;
154
155 static uint8_t
reversed_bs_r_1(void * t,bus_space_handle_t h,bus_size_t o)156 reversed_bs_r_1(void *t, bus_space_handle_t h, bus_size_t o)
157 {
158
159 return readb(h + (o &~ 3) + (3 - (o & 3)));
160 }
161
162 static void
reversed_bs_w_1(void * t,bus_space_handle_t h,bus_size_t o,u_int8_t v)163 reversed_bs_w_1(void *t, bus_space_handle_t h, bus_size_t o, u_int8_t v)
164 {
165
166 writeb(h + (o &~ 3) + (3 - (o & 3)), v);
167 }
168
169 static uint16_t
reversed_bs_r_2(void * t,bus_space_handle_t h,bus_size_t o)170 reversed_bs_r_2(void *t, bus_space_handle_t h, bus_size_t o)
171 {
172
173 return readw(h + (o &~ 3) + (2 - (o & 3)));
174 }
175
176 static void
reversed_bs_w_2(void * t,bus_space_handle_t h,bus_size_t o,uint16_t v)177 reversed_bs_w_2(void *t, bus_space_handle_t h, bus_size_t o, uint16_t v)
178 {
179
180 writew(h + (o &~ 3) + (2 - (o & 3)), v);
181 }
182