2 * Copyright (C) 2008 MARVELL INTERNATIONAL LTD.
5 * Developed by Semihalf.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
34 #include <sys/param.h>
38 #include <sys/clock.h>
39 #include <sys/resource.h>
40 #include <sys/systm.h>
42 #include <sys/kernel.h>
43 #include <sys/module.h>
45 #include <machine/bus.h>
46 #include <machine/resource.h>
48 #include <dev/ofw/ofw_bus.h>
49 #include <dev/ofw/ofw_bus_subr.h>
53 #define MV_RTC_TIME_REG 0x00
54 #define MV_RTC_DATE_REG 0x04
55 #define YEAR_BASE 2000
59 struct resource *res[1];
62 static struct resource_spec res_spec[] = {
63 { SYS_RES_MEMORY, 0, RF_ACTIVE },
67 static int mv_rtc_probe(device_t dev);
68 static int mv_rtc_attach(device_t dev);
70 static int mv_rtc_gettime(device_t dev, struct timespec *ts);
71 static int mv_rtc_settime(device_t dev, struct timespec *ts);
73 static uint32_t mv_rtc_reg_read(struct mv_rtc_softc *sc, bus_size_t off);
74 static int mv_rtc_reg_write(struct mv_rtc_softc *sc, bus_size_t off,
77 static device_method_t mv_rtc_methods[] = {
78 DEVMETHOD(device_probe, mv_rtc_probe),
79 DEVMETHOD(device_attach, mv_rtc_attach),
81 DEVMETHOD(clock_gettime, mv_rtc_gettime),
82 DEVMETHOD(clock_settime, mv_rtc_settime),
87 static driver_t mv_rtc_driver = {
90 sizeof(struct mv_rtc_softc),
92 static devclass_t mv_rtc_devclass;
94 DRIVER_MODULE(mv_rtc, simplebus, mv_rtc_driver, mv_rtc_devclass, 0, 0);
97 mv_rtc_probe(device_t dev)
100 if (!ofw_bus_status_okay(dev))
103 if (!ofw_bus_is_compatible(dev, "mrvl,rtc"))
106 device_set_desc(dev, "Marvell Integrated RTC");
107 return (BUS_PROBE_DEFAULT);
111 mv_rtc_attach(device_t dev)
113 struct mv_rtc_softc *sc;
115 sc = device_get_softc(dev);
118 clock_register(dev, 1000000);
120 if (bus_alloc_resources(dev, res_spec, sc->res)) {
121 device_printf(dev, "could not allocate resources\n");
129 mv_rtc_gettime(device_t dev, struct timespec *ts)
132 struct mv_rtc_softc *sc;
135 sc = device_get_softc(dev);
137 val = mv_rtc_reg_read(sc, MV_RTC_TIME_REG);
140 ct.sec = FROMBCD(val & 0x7f);
141 ct.min = FROMBCD((val & 0x7f00) >> 8);
142 ct.hour = FROMBCD((val & 0x3f0000) >> 16);
143 ct.dow = FROMBCD((val & 0x7000000) >> 24) - 1;
145 val = mv_rtc_reg_read(sc, MV_RTC_DATE_REG);
147 ct.day = FROMBCD(val & 0x7f);
148 ct.mon = FROMBCD((val & 0x1f00) >> 8);
149 ct.year = YEAR_BASE + FROMBCD((val & 0xff0000) >> 16);
151 return (clock_ct_to_ts(&ct, ts));
155 mv_rtc_settime(device_t dev, struct timespec *ts)
158 struct mv_rtc_softc *sc;
161 sc = device_get_softc(dev);
163 /* Resolution: 1 sec */
164 if (ts->tv_nsec >= 500000000)
167 clock_ts_to_ct(ts, &ct);
169 val = TOBCD(ct.sec) | (TOBCD(ct.min) << 8) |
170 (TOBCD(ct.hour) << 16) | (TOBCD( ct.dow + 1) << 24);
171 mv_rtc_reg_write(sc, MV_RTC_TIME_REG, val);
173 val = TOBCD(ct.day) | (TOBCD(ct.mon) << 8) |
174 (TOBCD(ct.year - YEAR_BASE) << 16);
175 mv_rtc_reg_write(sc, MV_RTC_DATE_REG, val);
181 mv_rtc_reg_read(struct mv_rtc_softc *sc, bus_size_t off)
184 return (bus_read_4(sc->res[0], off));
188 mv_rtc_reg_write(struct mv_rtc_softc *sc, bus_size_t off, uint32_t val)
191 bus_write_4(sc->res[0], off, val);