1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2004 Mark R V Murray
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, this list of conditions and the following disclaimer
12 * in this position and unchanged.
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 AUTHORS ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 */
29
30 #include <sys/cdefs.h>
31 #include <sys/param.h>
32 #include <sys/conf.h>
33 #include <sys/kernel.h>
34 #include <sys/ioccom.h>
35 #include <sys/module.h>
36 #include <sys/priv.h>
37 #include <sys/proc.h>
38 #include <sys/systm.h>
39
40 #include <machine/iodev.h>
41
42 #include <dev/io/iodev.h>
43
44 static int ioopen(struct cdev *dev, int flags, int fmt,
45 struct thread *td);
46 static int ioclose(struct cdev *dev, int flags, int fmt,
47 struct thread *td);
48 static int ioioctl(struct cdev *dev, u_long cmd, caddr_t data,
49 int fflag, struct thread *td);
50
51 static int iopio_read(struct iodev_pio_req *req);
52 static int iopio_write(struct iodev_pio_req *req);
53
54 static struct cdev *iodev;
55
56 static struct cdevsw io_cdevsw = {
57 .d_version = D_VERSION,
58 .d_open = ioopen,
59 .d_close = ioclose,
60 .d_ioctl = ioioctl,
61 .d_name = "io",
62 };
63
64 /* ARGSUSED */
65 static int
ioopen(struct cdev * dev __unused,int flags __unused,int fmt __unused,struct thread * td)66 ioopen(struct cdev *dev __unused, int flags __unused, int fmt __unused,
67 struct thread *td)
68 {
69 int error;
70
71 error = priv_check(td, PRIV_IO);
72 if (error != 0)
73 return (error);
74 error = securelevel_gt(td->td_ucred, 0);
75 if (error != 0)
76 return (error);
77 error = iodev_open(td);
78
79 return (error);
80 }
81
82 /* ARGSUSED */
83 static int
ioclose(struct cdev * dev __unused,int flags __unused,int fmt __unused,struct thread * td)84 ioclose(struct cdev *dev __unused, int flags __unused, int fmt __unused,
85 struct thread *td)
86 {
87
88 return (iodev_close(td));
89 }
90
91 /* ARGSUSED */
92 static int
ioioctl(struct cdev * dev __unused,u_long cmd,caddr_t data,int fflag __unused,struct thread * td __unused)93 ioioctl(struct cdev *dev __unused, u_long cmd, caddr_t data,
94 int fflag __unused, struct thread *td __unused)
95 {
96 struct iodev_pio_req *pio_req;
97 int error;
98
99 switch (cmd) {
100 case IODEV_PIO:
101 pio_req = (struct iodev_pio_req *)data;
102 switch (pio_req->access) {
103 case IODEV_PIO_READ:
104 error = iopio_read(pio_req);
105 break;
106 case IODEV_PIO_WRITE:
107 error = iopio_write(pio_req);
108 break;
109 default:
110 error = EINVAL;
111 break;
112 }
113 break;
114 default:
115 error = iodev_ioctl(cmd, data);
116 }
117
118 return (error);
119 }
120
121 static int
iopio_read(struct iodev_pio_req * req)122 iopio_read(struct iodev_pio_req *req)
123 {
124
125 switch (req->width) {
126 case 1:
127 req->val = iodev_read_1(req->port);
128 break;
129 case 2:
130 if (req->port & 1) {
131 req->val = iodev_read_1(req->port);
132 req->val |= iodev_read_1(req->port + 1) << 8;
133 } else
134 req->val = iodev_read_2(req->port);
135 break;
136 case 4:
137 if (req->port & 1) {
138 req->val = iodev_read_1(req->port);
139 req->val |= iodev_read_2(req->port + 1) << 8;
140 req->val |= iodev_read_1(req->port + 3) << 24;
141 } else if (req->port & 2) {
142 req->val = iodev_read_2(req->port);
143 req->val |= iodev_read_2(req->port + 2) << 16;
144 } else
145 req->val = iodev_read_4(req->port);
146 break;
147 default:
148 return (EINVAL);
149 }
150
151 return (0);
152 }
153
154 static int
iopio_write(struct iodev_pio_req * req)155 iopio_write(struct iodev_pio_req *req)
156 {
157
158 switch (req->width) {
159 case 1:
160 iodev_write_1(req->port, req->val);
161 break;
162 case 2:
163 if (req->port & 1) {
164 iodev_write_1(req->port, req->val);
165 iodev_write_1(req->port + 1, req->val >> 8);
166 } else
167 iodev_write_2(req->port, req->val);
168 break;
169 case 4:
170 if (req->port & 1) {
171 iodev_write_1(req->port, req->val);
172 iodev_write_2(req->port + 1, req->val >> 8);
173 iodev_write_1(req->port + 3, req->val >> 24);
174 } else if (req->port & 2) {
175 iodev_write_2(req->port, req->val);
176 iodev_write_2(req->port + 2, req->val >> 16);
177 } else
178 iodev_write_4(req->port, req->val);
179 break;
180 default:
181 return (EINVAL);
182 }
183
184 return (0);
185 }
186
187 /* ARGSUSED */
188 static int
io_modevent(module_t mod __unused,int type,void * data __unused)189 io_modevent(module_t mod __unused, int type, void *data __unused)
190 {
191 switch(type) {
192 case MOD_LOAD:
193 if (bootverbose)
194 printf("io: <I/O>\n");
195 iodev = make_dev(&io_cdevsw, 0,
196 UID_ROOT, GID_WHEEL, 0600, "io");
197 break;
198
199 case MOD_UNLOAD:
200 destroy_dev(iodev);
201 break;
202
203 case MOD_SHUTDOWN:
204 break;
205
206 default:
207 return(EOPNOTSUPP);
208 break;
209
210 }
211
212 return (0);
213 }
214
215 DEV_MODULE(io, io_modevent, NULL);
216 MODULE_VERSION(io, 1);
217