The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/arm/mv/rtc.c

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    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: stable/10/sys/arm/mv/rtc.c 266152 2014-05-15 16:11:06Z ian $");
   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 <dev/ofw/ofw_bus.h>
   49 #include <dev/ofw/ofw_bus_subr.h>
   50 
   51 #include "clock_if.h"
   52 
   53 #define MV_RTC_TIME_REG         0x00
   54 #define MV_RTC_DATE_REG         0x04
   55 #define YEAR_BASE               2000
   56 
   57 struct mv_rtc_softc {
   58         device_t dev;
   59         struct resource *res[1];
   60 };
   61 
   62 static struct resource_spec res_spec[] = {
   63         { SYS_RES_MEMORY, 0, RF_ACTIVE },
   64         { -1, 0 }
   65 };
   66 
   67 static int mv_rtc_probe(device_t dev);
   68 static int mv_rtc_attach(device_t dev);
   69 
   70 static int mv_rtc_gettime(device_t dev, struct timespec *ts);
   71 static int mv_rtc_settime(device_t dev, struct timespec *ts);
   72 
   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,
   75     uint32_t val);
   76 
   77 static device_method_t mv_rtc_methods[] = {
   78         DEVMETHOD(device_probe,         mv_rtc_probe),
   79         DEVMETHOD(device_attach,        mv_rtc_attach),
   80 
   81         DEVMETHOD(clock_gettime,        mv_rtc_gettime),
   82         DEVMETHOD(clock_settime,        mv_rtc_settime),
   83 
   84         { 0, 0 },
   85 };
   86 
   87 static driver_t mv_rtc_driver = {
   88         "rtc",
   89         mv_rtc_methods,
   90         sizeof(struct mv_rtc_softc),
   91 };
   92 static devclass_t mv_rtc_devclass;
   93 
   94 DRIVER_MODULE(mv_rtc, simplebus, mv_rtc_driver, mv_rtc_devclass, 0, 0);
   95 
   96 static int
   97 mv_rtc_probe(device_t dev)
   98 {
   99 
  100         if (!ofw_bus_status_okay(dev))
  101                 return (ENXIO);
  102 
  103         if (!ofw_bus_is_compatible(dev, "mrvl,rtc"))
  104                 return (ENXIO);
  105 
  106         device_set_desc(dev, "Marvell Integrated RTC");
  107         return (BUS_PROBE_DEFAULT);
  108 }
  109 
  110 static int
  111 mv_rtc_attach(device_t dev)
  112 {
  113         struct mv_rtc_softc *sc;
  114 
  115         sc = device_get_softc(dev);
  116         sc->dev = dev;
  117 
  118         clock_register(dev, 1000000);
  119 
  120         if (bus_alloc_resources(dev, res_spec, sc->res)) {
  121                 device_printf(dev, "could not allocate resources\n");
  122                 return (ENXIO);
  123         }
  124 
  125         return (0);
  126 }
  127 
  128 static int
  129 mv_rtc_gettime(device_t dev, struct timespec *ts)
  130 {
  131         struct clocktime ct;
  132         struct mv_rtc_softc *sc;
  133         uint32_t val;
  134 
  135         sc = device_get_softc(dev);
  136 
  137         val = mv_rtc_reg_read(sc, MV_RTC_TIME_REG);
  138 
  139         ct.nsec = 0;
  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;
  144 
  145         val = mv_rtc_reg_read(sc, MV_RTC_DATE_REG);
  146 
  147         ct.day = FROMBCD(val & 0x7f);
  148         ct.mon = FROMBCD((val & 0x1f00) >> 8);
  149         ct.year = YEAR_BASE + FROMBCD((val & 0xff0000) >> 16);
  150 
  151         return (clock_ct_to_ts(&ct, ts));
  152 }
  153 
  154 static int
  155 mv_rtc_settime(device_t dev, struct timespec *ts)
  156 {
  157         struct clocktime ct;
  158         struct mv_rtc_softc *sc;
  159         uint32_t val;
  160 
  161         sc = device_get_softc(dev);
  162 
  163         /* Resolution: 1 sec */
  164         if (ts->tv_nsec >= 500000000)
  165                 ts->tv_sec++;
  166         ts->tv_nsec = 0;
  167         clock_ts_to_ct(ts, &ct);
  168 
  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);
  172 
  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);
  176 
  177         return (0);
  178 }
  179 
  180 static uint32_t
  181 mv_rtc_reg_read(struct mv_rtc_softc *sc, bus_size_t off)
  182 {
  183 
  184         return (bus_read_4(sc->res[0], off));
  185 }
  186 
  187 static int
  188 mv_rtc_reg_write(struct mv_rtc_softc *sc, bus_size_t off, uint32_t val)
  189 {
  190 
  191         bus_write_4(sc->res[0], off, val);
  192         return (0);
  193 }

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