FreeBSD/Linux Kernel Cross Reference
sys/arm/mv/rtc.c
1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (C) 2008 MARVELL INTERNATIONAL LTD.
5 * All rights reserved.
6 *
7 * Developed by Semihalf.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of MARVELL nor the names of contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
36 #include <sys/param.h>
37 #include <sys/bus.h>
38 #include <sys/lock.h>
39 #include <sys/time.h>
40 #include <sys/clock.h>
41 #include <sys/resource.h>
42 #include <sys/systm.h>
43 #include <sys/rman.h>
44 #include <sys/kernel.h>
45 #include <sys/module.h>
46
47 #include <machine/bus.h>
48 #include <machine/resource.h>
49
50 #include <dev/ofw/ofw_bus.h>
51 #include <dev/ofw/ofw_bus_subr.h>
52
53 #include "clock_if.h"
54
55 #define MV_RTC_TIME_REG 0x00
56 #define MV_RTC_DATE_REG 0x04
57 #define YEAR_BASE 2000
58
59 struct mv_rtc_softc {
60 device_t dev;
61 struct resource *res[1];
62 };
63
64 static struct resource_spec res_spec[] = {
65 { SYS_RES_MEMORY, 0, RF_ACTIVE },
66 { -1, 0 }
67 };
68
69 static int mv_rtc_probe(device_t dev);
70 static int mv_rtc_attach(device_t dev);
71
72 static int mv_rtc_gettime(device_t dev, struct timespec *ts);
73 static int mv_rtc_settime(device_t dev, struct timespec *ts);
74
75 static uint32_t mv_rtc_reg_read(struct mv_rtc_softc *sc, bus_size_t off);
76 static int mv_rtc_reg_write(struct mv_rtc_softc *sc, bus_size_t off,
77 uint32_t val);
78
79 static device_method_t mv_rtc_methods[] = {
80 DEVMETHOD(device_probe, mv_rtc_probe),
81 DEVMETHOD(device_attach, mv_rtc_attach),
82
83 DEVMETHOD(clock_gettime, mv_rtc_gettime),
84 DEVMETHOD(clock_settime, mv_rtc_settime),
85
86 { 0, 0 },
87 };
88
89 static driver_t mv_rtc_driver = {
90 "rtc",
91 mv_rtc_methods,
92 sizeof(struct mv_rtc_softc),
93 };
94
95 DRIVER_MODULE(mv_rtc, simplebus, mv_rtc_driver, 0, 0);
96
97 static int
98 mv_rtc_probe(device_t dev)
99 {
100
101 if (!ofw_bus_status_okay(dev))
102 return (ENXIO);
103
104 if (!ofw_bus_is_compatible(dev, "mrvl,rtc"))
105 return (ENXIO);
106
107 device_set_desc(dev, "Marvell Integrated RTC");
108 return (BUS_PROBE_DEFAULT);
109 }
110
111 static int
112 mv_rtc_attach(device_t dev)
113 {
114 struct mv_rtc_softc *sc;
115
116 sc = device_get_softc(dev);
117 sc->dev = dev;
118
119 clock_register(dev, 1000000);
120
121 if (bus_alloc_resources(dev, res_spec, sc->res)) {
122 device_printf(dev, "could not allocate resources\n");
123 return (ENXIO);
124 }
125
126 return (0);
127 }
128
129 static int
130 mv_rtc_gettime(device_t dev, struct timespec *ts)
131 {
132 struct clocktime ct;
133 struct mv_rtc_softc *sc;
134 uint32_t val;
135
136 sc = device_get_softc(dev);
137
138 val = mv_rtc_reg_read(sc, MV_RTC_TIME_REG);
139
140 ct.nsec = 0;
141 ct.sec = FROMBCD(val & 0x7f);
142 ct.min = FROMBCD((val & 0x7f00) >> 8);
143 ct.hour = FROMBCD((val & 0x3f0000) >> 16);
144 ct.dow = FROMBCD((val & 0x7000000) >> 24) - 1;
145
146 val = mv_rtc_reg_read(sc, MV_RTC_DATE_REG);
147
148 ct.day = FROMBCD(val & 0x7f);
149 ct.mon = FROMBCD((val & 0x1f00) >> 8);
150 ct.year = YEAR_BASE + FROMBCD((val & 0xff0000) >> 16);
151
152 return (clock_ct_to_ts(&ct, ts));
153 }
154
155 static int
156 mv_rtc_settime(device_t dev, struct timespec *ts)
157 {
158 struct clocktime ct;
159 struct mv_rtc_softc *sc;
160 uint32_t val;
161
162 sc = device_get_softc(dev);
163
164 /* Resolution: 1 sec */
165 if (ts->tv_nsec >= 500000000)
166 ts->tv_sec++;
167 ts->tv_nsec = 0;
168 clock_ts_to_ct(ts, &ct);
169
170 val = TOBCD(ct.sec) | (TOBCD(ct.min) << 8) |
171 (TOBCD(ct.hour) << 16) | (TOBCD( ct.dow + 1) << 24);
172 mv_rtc_reg_write(sc, MV_RTC_TIME_REG, val);
173
174 val = TOBCD(ct.day) | (TOBCD(ct.mon) << 8) |
175 (TOBCD(ct.year - YEAR_BASE) << 16);
176 mv_rtc_reg_write(sc, MV_RTC_DATE_REG, val);
177
178 return (0);
179 }
180
181 static uint32_t
182 mv_rtc_reg_read(struct mv_rtc_softc *sc, bus_size_t off)
183 {
184
185 return (bus_read_4(sc->res[0], off));
186 }
187
188 static int
189 mv_rtc_reg_write(struct mv_rtc_softc *sc, bus_size_t off, uint32_t val)
190 {
191
192 bus_write_4(sc->res[0], off, val);
193 return (0);
194 }
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