1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2010 Juli Mallett <[email protected]>
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 * $FreeBSD$
29 */
30
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
33
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/bus.h>
37 #include <sys/clock.h>
38 #include <sys/kernel.h>
39 #include <sys/lock.h>
40 #include <sys/module.h>
41
42 #include <contrib/octeon-sdk/cvmx.h>
43 #include <contrib/octeon-sdk/cvmx-rtc.h>
44
45 #include "clock_if.h"
46
47 static int octeon_rtc_attach(device_t dev);
48 static int octeon_rtc_probe(device_t dev);
49
50 static int octeon_rtc_settime(device_t dev, struct timespec *ts);
51 static int octeon_rtc_gettime(device_t dev, struct timespec *ts);
52
53 static device_method_t octeon_rtc_methods[] = {
54 /* Device interface */
55 DEVMETHOD(device_probe, octeon_rtc_probe),
56 DEVMETHOD(device_attach, octeon_rtc_attach),
57
58 /* clock interface */
59 DEVMETHOD(clock_gettime, octeon_rtc_gettime),
60 DEVMETHOD(clock_settime, octeon_rtc_settime),
61 { 0, 0 }
62 };
63
64 static driver_t octeon_rtc_driver = {
65 "rtc",
66 octeon_rtc_methods,
67 0
68 };
69 static devclass_t octeon_rtc_devclass;
70 DRIVER_MODULE(rtc, nexus, octeon_rtc_driver, octeon_rtc_devclass, 0, 0);
71
72 static int
octeon_rtc_probe(device_t dev)73 octeon_rtc_probe(device_t dev)
74 {
75 cvmx_rtc_options_t supported;
76
77 if (device_get_unit(dev) != 0)
78 return (ENXIO);
79
80 supported = cvmx_rtc_supported();
81 if (supported == 0)
82 return (ENXIO);
83
84 device_set_desc(dev, "Cavium Octeon Realtime Clock");
85 return (BUS_PROBE_NOWILDCARD);
86 }
87
88 static int
octeon_rtc_attach(device_t dev)89 octeon_rtc_attach(device_t dev)
90 {
91 cvmx_rtc_options_t supported;
92
93 supported = cvmx_rtc_supported();
94 if ((supported & CVMX_RTC_READ) == 0)
95 return (ENXIO);
96
97 clock_register(dev, 1000000);
98 return (0);
99 }
100
101 static int
octeon_rtc_settime(device_t dev,struct timespec * ts)102 octeon_rtc_settime(device_t dev, struct timespec *ts)
103 {
104 cvmx_rtc_options_t supported;
105 uint32_t status;
106
107 supported = cvmx_rtc_supported();
108 if ((supported & CVMX_RTC_WRITE) == 0)
109 return (ENOTSUP);
110
111 status = cvmx_rtc_write(ts->tv_sec);
112 if (status != 0)
113 return (EINVAL);
114
115 return (0);
116 }
117
118 static int
octeon_rtc_gettime(device_t dev,struct timespec * ts)119 octeon_rtc_gettime(device_t dev, struct timespec *ts)
120 {
121 uint32_t secs;
122
123 secs = cvmx_rtc_read();
124 if (secs == 0)
125 return (ENOTSUP);
126
127 ts->tv_sec = secs;
128 ts->tv_nsec = 0;
129
130 return (0);
131 }
132