1 /*
2 * Copyright (C) 2010 Andrew Turner
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 */
27
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD: releng/9.0/sys/arm/s3c2xx0/s3c24x0_rtc.c 210397 2010-07-22 23:23:39Z andrew $");
30 #include <sys/param.h>
31 #include <sys/bus.h>
32 #include <sys/time.h>
33 #include <sys/clock.h>
34 #include <sys/resource.h>
35 #include <sys/systm.h>
36 #include <sys/rman.h>
37 #include <sys/kernel.h>
38 #include <sys/module.h>
39
40 #include <machine/bus.h>
41
42 #include <arm/s3c2xx0/s3c24x0reg.h>
43
44 #include "clock_if.h"
45
46 #define YEAR_BASE 2000
47
48 struct s3c2xx0_rtc_softc {
49 struct resource *mem_res;
50 };
51
52 static int
53 s3c2xx0_rtc_probe(device_t dev)
54 {
55
56 device_set_desc(dev, "Samsung Integrated RTC");
57 return (0);
58 }
59
60 static int
61 s3c2xx0_rtc_attach(device_t dev)
62 {
63 struct s3c2xx0_rtc_softc *sc;
64 int error, rid;
65
66 sc = device_get_softc(dev);
67 error = 0;
68
69 rid = 0;
70 sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_IOPORT, &rid,
71 RF_ACTIVE);
72 if (sc->mem_res == NULL) {
73 error = ENOMEM;
74 goto out;
75 }
76
77 bus_write_1(sc->mem_res, RTC_RTCCON, RTCCON_RTCEN);
78 clock_register(dev, 1000000);
79
80 out:
81 return (error);
82 }
83
84 static int
85 s3c2xx0_rtc_gettime(device_t dev, struct timespec *ts)
86 {
87 struct s3c2xx0_rtc_softc *sc;
88 struct clocktime ct;
89
90 #define READ_TIME() do { \
91 ct.year = YEAR_BASE + FROMBCD(bus_read_1(sc->mem_res, RTC_BCDYEAR)); \
92 ct.mon = FROMBCD(bus_read_1(sc->mem_res, RTC_BCDMON)); \
93 ct.dow = FROMBCD(bus_read_1(sc->mem_res, RTC_BCDDAY)); \
94 ct.day = FROMBCD(bus_read_1(sc->mem_res, RTC_BCDDATE)); \
95 ct.hour = FROMBCD(bus_read_1(sc->mem_res, RTC_BCDHOUR)); \
96 ct.min = FROMBCD(bus_read_1(sc->mem_res, RTC_BCDMIN)); \
97 ct.sec = FROMBCD(bus_read_1(sc->mem_res, RTC_BCDSEC)); \
98 } while (0)
99
100 sc = device_get_softc(dev);
101
102 ct.nsec = 0;
103 READ_TIME();
104 /*
105 * Check if we could have read incorrect values
106 * as the values could have changed.
107 */
108 if (ct.sec == 0) {
109 READ_TIME();
110 }
111
112 ct.dow = -1;
113
114 #undef READ_TIME
115 return (clock_ct_to_ts(&ct, ts));
116 }
117
118 static int
119 s3c2xx0_rtc_settime(device_t dev, struct timespec *ts)
120 {
121 struct s3c2xx0_rtc_softc *sc;
122 struct clocktime ct;
123
124 sc = device_get_softc(dev);
125
126 /* Resolution: 1 sec */
127 if (ts->tv_nsec >= 500000000)
128 ts->tv_sec++;
129 ts->tv_nsec = 0;
130 clock_ts_to_ct(ts, &ct);
131
132 bus_write_1(sc->mem_res, RTC_BCDSEC, TOBCD(ct.sec));
133 bus_write_1(sc->mem_res, RTC_BCDMIN, TOBCD(ct.min));
134 bus_write_1(sc->mem_res, RTC_BCDHOUR, TOBCD(ct.hour));
135 bus_write_1(sc->mem_res, RTC_BCDDATE, TOBCD(ct.day));
136 bus_write_1(sc->mem_res, RTC_BCDDAY, TOBCD(ct.dow));
137 bus_write_1(sc->mem_res, RTC_BCDMON, TOBCD(ct.mon));
138 bus_write_1(sc->mem_res, RTC_BCDYEAR, TOBCD(ct.year - YEAR_BASE));
139
140 return (0);
141 }
142
143 static device_method_t s3c2xx0_rtc_methods[] = {
144 DEVMETHOD(device_probe, s3c2xx0_rtc_probe),
145 DEVMETHOD(device_attach, s3c2xx0_rtc_attach),
146
147 DEVMETHOD(clock_gettime, s3c2xx0_rtc_gettime),
148 DEVMETHOD(clock_settime, s3c2xx0_rtc_settime),
149
150 { 0, 0 },
151 };
152
153 static driver_t s3c2xx0_rtc_driver = {
154 "rtc",
155 s3c2xx0_rtc_methods,
156 sizeof(struct s3c2xx0_rtc_softc),
157 };
158 static devclass_t s3c2xx0_rtc_devclass;
159
160 DRIVER_MODULE(s3c2xx0_rtc, s3c24x0, s3c2xx0_rtc_driver, s3c2xx0_rtc_devclass,
161 0, 0);
162
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