FreeBSD/Linux Kernel Cross Reference
sys/arm/mv/rtc.c
1 /*-
2 * Copyright (C) 2008 MARVELL INTERNATIONAL LTD.
3 * All rights reserved.
4 *
5 * Developed by Semihalf.
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 * 3. Neither the name of MARVELL nor the names of contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD: releng/8.3/sys/arm/mv/rtc.c 183840 2008-10-13 20:07:13Z raj $");
34 #include <sys/param.h>
35 #include <sys/bus.h>
36 #include <sys/lock.h>
37 #include <sys/time.h>
38 #include <sys/clock.h>
39 #include <sys/resource.h>
40 #include <sys/systm.h>
41 #include <sys/rman.h>
42 #include <sys/kernel.h>
43 #include <sys/module.h>
44
45 #include <machine/bus.h>
46 #include <machine/resource.h>
47
48 #include "clock_if.h"
49
50 #define MV_RTC_TIME_REG 0x00
51 #define MV_RTC_DATE_REG 0x04
52 #define YEAR_BASE 2000
53
54 struct mv_rtc_softc {
55 device_t dev;
56 struct resource *res[1];
57 };
58
59 static struct resource_spec res_spec[] = {
60 { SYS_RES_MEMORY, 0, RF_ACTIVE },
61 { -1, 0 }
62 };
63
64 static int mv_rtc_probe(device_t dev);
65 static int mv_rtc_attach(device_t dev);
66
67 static int mv_rtc_gettime(device_t dev, struct timespec *ts);
68 static int mv_rtc_settime(device_t dev, struct timespec *ts);
69
70 static uint32_t mv_rtc_reg_read(struct mv_rtc_softc *sc, bus_size_t off);
71 static int mv_rtc_reg_write(struct mv_rtc_softc *sc, bus_size_t off,
72 uint32_t val);
73
74 static device_method_t mv_rtc_methods[] = {
75 DEVMETHOD(device_probe, mv_rtc_probe),
76 DEVMETHOD(device_attach, mv_rtc_attach),
77
78 DEVMETHOD(clock_gettime, mv_rtc_gettime),
79 DEVMETHOD(clock_settime, mv_rtc_settime),
80
81 { 0, 0 },
82 };
83
84 static driver_t mv_rtc_driver = {
85 "rtc",
86 mv_rtc_methods,
87 sizeof(struct mv_rtc_softc),
88 };
89 static devclass_t mv_rtc_devclass;
90
91 DRIVER_MODULE(mv_rtc, mbus, mv_rtc_driver, mv_rtc_devclass, 0, 0);
92
93 static int
94 mv_rtc_probe(device_t dev)
95 {
96
97 device_set_desc(dev, "Marvell Integrated RTC");
98 return (0);
99 }
100
101 static int
102 mv_rtc_attach(device_t dev)
103 {
104 struct mv_rtc_softc *sc;
105
106 sc = device_get_softc(dev);
107 sc->dev = dev;
108
109 clock_register(dev, 1000000);
110
111 if (bus_alloc_resources(dev, res_spec, sc->res)) {
112 device_printf(dev, "could not allocate resources\n");
113 return (ENXIO);
114 }
115
116 return (0);
117 }
118
119 static int
120 mv_rtc_gettime(device_t dev, struct timespec *ts)
121 {
122 struct clocktime ct;
123 struct mv_rtc_softc *sc;
124 uint32_t val;
125
126 sc = device_get_softc(dev);
127
128 val = mv_rtc_reg_read(sc, MV_RTC_TIME_REG);
129
130 ct.nsec = 0;
131 ct.sec = FROMBCD(val & 0x7f);
132 ct.min = FROMBCD((val & 0x7f00) >> 8);
133 ct.hour = FROMBCD((val & 0x3f0000) >> 16);
134 ct.dow = FROMBCD((val & 0x7000000) >> 24) - 1;
135
136 val = mv_rtc_reg_read(sc, MV_RTC_DATE_REG);
137
138 ct.day = FROMBCD(val & 0x7f);
139 ct.mon = FROMBCD((val & 0x1f00) >> 8);
140 ct.year = YEAR_BASE + FROMBCD((val & 0xff0000) >> 16);
141
142 return (clock_ct_to_ts(&ct, ts));
143 }
144
145 static int
146 mv_rtc_settime(device_t dev, struct timespec *ts)
147 {
148 struct clocktime ct;
149 struct mv_rtc_softc *sc;
150 uint32_t val;
151
152 sc = device_get_softc(dev);
153
154 /* Resolution: 1 sec */
155 if (ts->tv_nsec >= 500000000)
156 ts->tv_sec++;
157 ts->tv_nsec = 0;
158 clock_ts_to_ct(ts, &ct);
159
160 val = TOBCD(ct.sec) | (TOBCD(ct.min) << 8) |
161 (TOBCD(ct.hour) << 16) | (TOBCD( ct.dow + 1) << 24);
162 mv_rtc_reg_write(sc, MV_RTC_TIME_REG, val);
163
164 val = TOBCD(ct.day) | (TOBCD(ct.mon) << 8) |
165 (TOBCD(ct.year - YEAR_BASE) << 16);
166 mv_rtc_reg_write(sc, MV_RTC_DATE_REG, val);
167
168 return (0);
169 }
170
171 static uint32_t
172 mv_rtc_reg_read(struct mv_rtc_softc *sc, bus_size_t off)
173 {
174
175 return (bus_read_4(sc->res[0], off));
176 }
177
178 static int
179 mv_rtc_reg_write(struct mv_rtc_softc *sc, bus_size_t off, uint32_t val)
180 {
181
182 bus_write_4(sc->res[0], off, val);
183 return (0);
184 }
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