1 /*-
2 * Copyright (c) 2010 Juli Mallett <jmallett@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, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD$
27 */
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
31
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/bus.h>
35 #include <sys/clock.h>
36 #include <sys/kernel.h>
37 #include <sys/lock.h>
38 #include <sys/module.h>
39
40 #include <contrib/octeon-sdk/cvmx.h>
41 #include <contrib/octeon-sdk/cvmx-rtc.h>
42
43 #include "clock_if.h"
44
45 static int octeon_rtc_attach(device_t dev);
46 static int octeon_rtc_probe(device_t dev);
47
48 static int octeon_rtc_settime(device_t dev, struct timespec *ts);
49 static int octeon_rtc_gettime(device_t dev, struct timespec *ts);
50
51 static device_method_t octeon_rtc_methods[] = {
52 /* Device interface */
53 DEVMETHOD(device_probe, octeon_rtc_probe),
54 DEVMETHOD(device_attach, octeon_rtc_attach),
55
56 /* clock interface */
57 DEVMETHOD(clock_gettime, octeon_rtc_gettime),
58 DEVMETHOD(clock_settime, octeon_rtc_settime),
59
60 { 0, 0 }
61 };
62
63 static driver_t octeon_rtc_driver = {
64 "rtc",
65 octeon_rtc_methods,
66 0
67 };
68 static devclass_t octeon_rtc_devclass;
69 DRIVER_MODULE(rtc, nexus, octeon_rtc_driver, octeon_rtc_devclass, 0, 0);
70
71 static int
octeon_rtc_probe(device_t dev)72 octeon_rtc_probe(device_t dev)
73 {
74 cvmx_rtc_options_t supported;
75
76 if (device_get_unit(dev) != 0)
77 return (ENXIO);
78
79 supported = cvmx_rtc_supported();
80 if (supported == 0)
81 return (ENXIO);
82
83 device_set_desc(dev, "Cavium Octeon Realtime Clock");
84 return (BUS_PROBE_NOWILDCARD);
85 }
86
87 static int
octeon_rtc_attach(device_t dev)88 octeon_rtc_attach(device_t dev)
89 {
90 cvmx_rtc_options_t supported;
91
92 supported = cvmx_rtc_supported();
93 if ((supported & CVMX_RTC_READ) == 0)
94 return (ENXIO);
95
96 clock_register(dev, 1000000);
97 return (0);
98 }
99
100 static int
octeon_rtc_settime(device_t dev,struct timespec * ts)101 octeon_rtc_settime(device_t dev, struct timespec *ts)
102 {
103 cvmx_rtc_options_t supported;
104 uint32_t status;
105
106 supported = cvmx_rtc_supported();
107 if ((supported & CVMX_RTC_WRITE) == 0)
108 return (ENOTSUP);
109
110 status = cvmx_rtc_write(ts->tv_sec);
111 if (status != 0)
112 return (EINVAL);
113
114 return (0);
115 }
116
117 static int
octeon_rtc_gettime(device_t dev,struct timespec * ts)118 octeon_rtc_gettime(device_t dev, struct timespec *ts)
119 {
120 uint32_t secs;
121
122 secs = cvmx_rtc_read();
123 if (secs == 0)
124 return (ENOTSUP);
125
126 ts->tv_sec = secs;
127 ts->tv_nsec = 0;
128
129 return (0);
130 }
131