1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2011 Nathan Whitehorn
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 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
31
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/module.h>
35 #include <sys/bus.h>
36 #include <sys/conf.h>
37 #include <sys/clock.h>
38 #include <sys/cpu.h>
39 #include <sys/eventhandler.h>
40 #include <sys/kernel.h>
41 #include <sys/reboot.h>
42 #include <sys/sysctl.h>
43
44 #include <dev/ofw/ofw_bus.h>
45 #include <dev/ofw/openfirm.h>
46
47 #include <machine/rtas.h>
48
49 #include "clock_if.h"
50
51 static int rtasdev_probe(device_t);
52 static int rtasdev_attach(device_t);
53 /* clock interface */
54 static int rtas_gettime(device_t dev, struct timespec *ts);
55 static int rtas_settime(device_t dev, struct timespec *ts);
56
57 static void rtas_shutdown(void *arg, int howto);
58
59 static device_method_t rtasdev_methods[] = {
60 /* Device interface */
61 DEVMETHOD(device_probe, rtasdev_probe),
62 DEVMETHOD(device_attach, rtasdev_attach),
63
64 /* clock interface */
65 DEVMETHOD(clock_gettime, rtas_gettime),
66 DEVMETHOD(clock_settime, rtas_settime),
67
68 { 0, 0 },
69 };
70
71 static driver_t rtasdev_driver = {
72 "rtas",
73 rtasdev_methods,
74 0
75 };
76
77 static devclass_t rtasdev_devclass;
78
79 DRIVER_MODULE(rtasdev, ofwbus, rtasdev_driver, rtasdev_devclass, 0, 0);
80
81 static int
rtasdev_probe(device_t dev)82 rtasdev_probe(device_t dev)
83 {
84 const char *name = ofw_bus_get_name(dev);
85
86 if (strcmp(name, "rtas") != 0)
87 return (ENXIO);
88 if (!rtas_exists())
89 return (ENXIO);
90
91 device_set_desc(dev, "Run-Time Abstraction Services");
92 return (0);
93 }
94
95 static int
rtasdev_attach(device_t dev)96 rtasdev_attach(device_t dev)
97 {
98 if (rtas_token_lookup("get-time-of-day") != -1)
99 clock_register(dev, 2000);
100
101 EVENTHANDLER_REGISTER(shutdown_final, rtas_shutdown, NULL,
102 SHUTDOWN_PRI_LAST);
103
104 return (0);
105 }
106
107 static int
rtas_gettime(device_t dev,struct timespec * ts)108 rtas_gettime(device_t dev, struct timespec *ts) {
109 struct clocktime ct;
110 cell_t tod[8];
111 cell_t token;
112 int error;
113
114 token = rtas_token_lookup("get-time-of-day");
115 if (token == -1)
116 return (ENXIO);
117 error = rtas_call_method(token, 0, 8, &tod[0], &tod[1], &tod[2],
118 &tod[3], &tod[4], &tod[5], &tod[6], &tod[7]);
119 if (error < 0)
120 return (ENXIO);
121 if (tod[0] != 0)
122 return ((tod[0] == -1) ? ENXIO : EAGAIN);
123
124 ct.year = tod[1];
125 ct.mon = tod[2];
126 ct.day = tod[3];
127 ct.hour = tod[4];
128 ct.min = tod[5];
129 ct.sec = tod[6];
130 ct.nsec = tod[7];
131
132 return (clock_ct_to_ts(&ct, ts));
133 }
134
135 static int
rtas_settime(device_t dev,struct timespec * ts)136 rtas_settime(device_t dev, struct timespec *ts)
137 {
138 struct clocktime ct;
139 cell_t token, status;
140 int error;
141
142 token = rtas_token_lookup("set-time-of-day");
143 if (token == -1)
144 return (ENXIO);
145
146 clock_ts_to_ct(ts, &ct);
147 error = rtas_call_method(token, 7, 1, ct.year, ct.mon, ct.day, ct.hour,
148 ct.min, ct.sec, ct.nsec, &status);
149 if (error < 0)
150 return (ENXIO);
151 if (status != 0)
152 return (((int)status < 0) ? ENXIO : EAGAIN);
153
154 return (0);
155 }
156
157 static void
rtas_shutdown(void * arg,int howto)158 rtas_shutdown(void *arg, int howto)
159 {
160 cell_t token, status;
161
162 if (howto & RB_HALT) {
163 token = rtas_token_lookup("power-off");
164 if (token == -1)
165 return;
166
167 rtas_call_method(token, 2, 1, 0, 0, &status);
168 } else {
169 token = rtas_token_lookup("system-reboot");
170 if (token == -1)
171 return;
172
173 rtas_call_method(token, 0, 1, &status);
174 }
175 }
176