FreeBSD/Linux Kernel Cross Reference
sys/arm/s3c2xx0/s3c24x0_rtc.c

     /*
      * Copyright (C) 2010 Andrew Turner
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/10.0/sys/arm/s3c2xx0/s3c24x0_rtc.c 210397 2010-07-22 23:23:39Z andrew $");
    #include <sys/param.h>
    #include <sys/bus.h>
    #include <sys/time.h>
    #include <sys/clock.h>
    #include <sys/resource.h>
    #include <sys/systm.h>
    #include <sys/rman.h>
    #include <sys/kernel.h>
    #include <sys/module.h>
    
    #include <machine/bus.h>
    
    #include <arm/s3c2xx0/s3c24x0reg.h>
    
    #include "clock_if.h"
    
    #define YEAR_BASE               2000
    
    struct s3c2xx0_rtc_softc {
            struct resource *mem_res;
    };
    
    static int
    s3c2xx0_rtc_probe(device_t dev)
    {
    
            device_set_desc(dev, "Samsung Integrated RTC");
            return (0);
    }
    
    static int
    s3c2xx0_rtc_attach(device_t dev)
    {
            struct s3c2xx0_rtc_softc *sc;
            int error, rid;
    
            sc = device_get_softc(dev);
            error = 0;
    
            rid = 0;
            sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_IOPORT, &rid,
                RF_ACTIVE);
            if (sc->mem_res == NULL) {
                    error = ENOMEM;
                    goto out;
            }
    
            bus_write_1(sc->mem_res, RTC_RTCCON, RTCCON_RTCEN);
            clock_register(dev, 1000000);
    
    out:
            return (error);
    }
    
    static int
    s3c2xx0_rtc_gettime(device_t dev, struct timespec *ts)
    {
            struct s3c2xx0_rtc_softc *sc;
            struct clocktime ct;
    
    #define READ_TIME() do {                                                \
            ct.year = YEAR_BASE + FROMBCD(bus_read_1(sc->mem_res, RTC_BCDYEAR)); \
            ct.mon = FROMBCD(bus_read_1(sc->mem_res, RTC_BCDMON));          \
            ct.dow = FROMBCD(bus_read_1(sc->mem_res, RTC_BCDDAY));          \
            ct.day = FROMBCD(bus_read_1(sc->mem_res, RTC_BCDDATE));         \
            ct.hour = FROMBCD(bus_read_1(sc->mem_res, RTC_BCDHOUR));        \
            ct.min = FROMBCD(bus_read_1(sc->mem_res, RTC_BCDMIN));          \
            ct.sec = FROMBCD(bus_read_1(sc->mem_res, RTC_BCDSEC));          \
    } while (0)
    
           sc = device_get_softc(dev);
   
           ct.nsec = 0;
           READ_TIME();
           /*
            * Check if we could have read incorrect values
            * as the values could have changed.
            */
           if (ct.sec == 0) {
                   READ_TIME();
           }
   
           ct.dow = -1;
   
   #undef READ_TIME
           return (clock_ct_to_ts(&ct, ts));
   }
   
   static int
   s3c2xx0_rtc_settime(device_t dev, struct timespec *ts)
   {
           struct s3c2xx0_rtc_softc *sc;
           struct clocktime ct;
   
           sc = device_get_softc(dev);
   
           /* Resolution: 1 sec */
           if (ts->tv_nsec >= 500000000)
                   ts->tv_sec++;
           ts->tv_nsec = 0;
           clock_ts_to_ct(ts, &ct);
   
           bus_write_1(sc->mem_res, RTC_BCDSEC, TOBCD(ct.sec));
           bus_write_1(sc->mem_res, RTC_BCDMIN, TOBCD(ct.min));
           bus_write_1(sc->mem_res, RTC_BCDHOUR, TOBCD(ct.hour));
           bus_write_1(sc->mem_res, RTC_BCDDATE, TOBCD(ct.day));
           bus_write_1(sc->mem_res, RTC_BCDDAY, TOBCD(ct.dow));
           bus_write_1(sc->mem_res, RTC_BCDMON, TOBCD(ct.mon));
           bus_write_1(sc->mem_res, RTC_BCDYEAR, TOBCD(ct.year - YEAR_BASE));
   
           return (0);
   }
   
   static device_method_t s3c2xx0_rtc_methods[] = {
           DEVMETHOD(device_probe,         s3c2xx0_rtc_probe),
           DEVMETHOD(device_attach,        s3c2xx0_rtc_attach),
   
           DEVMETHOD(clock_gettime,        s3c2xx0_rtc_gettime),
           DEVMETHOD(clock_settime,        s3c2xx0_rtc_settime),
   
           { 0, 0 },
   };
   
   static driver_t s3c2xx0_rtc_driver = {
           "rtc",
           s3c2xx0_rtc_methods,
           sizeof(struct s3c2xx0_rtc_softc),
   };
   static devclass_t s3c2xx0_rtc_devclass;
   
   DRIVER_MODULE(s3c2xx0_rtc, s3c24x0, s3c2xx0_rtc_driver, s3c2xx0_rtc_devclass,
       0, 0);
   

Cache object: 817b8a9798134accd0ba1c76d3bdaae9