ar71xx_bus_space_reversed.c revision 331722 
1/*-
2 * Copyright (c) 2009, Oleksandr Tymoshenko <gonzo@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice unmodified, this list of conditions, and the following
10 *    disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: stable/11/sys/mips/atheros/ar71xx_bus_space_reversed.c 331722 2018-03-29 02:50:57Z eadler $");
29
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
37static bs_r_1_proto(reversed);
38static bs_r_2_proto(reversed);
39static bs_w_1_proto(reversed);
40static 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 */
46static 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
153bus_space_tag_t ar71xx_bus_space_reversed = &bus_space_reversed;
154
155static uint8_t
156reversed_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
162static void
163reversed_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
169static uint16_t
170reversed_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
176static void
177reversed_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