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

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * Copyright (C) 2008 MARVELL INTERNATIONAL LTD.
      * All rights reserved.
      *
      * Developed by Semihalf.
      *
      * 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.
     * 3. Neither the name of MARVELL nor the names of contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY 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 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/12.0/sys/arm/mv/rtc.c 326023 2017-11-20 19:43:44Z pfg $");
    #include <sys/param.h>
    #include <sys/bus.h>
    #include <sys/lock.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 <machine/resource.h>
    
    #include <dev/ofw/ofw_bus.h>
    #include <dev/ofw/ofw_bus_subr.h>
    
    #include "clock_if.h"
    
    #define MV_RTC_TIME_REG         0x00
    #define MV_RTC_DATE_REG         0x04
    #define YEAR_BASE               2000
    
    struct mv_rtc_softc {
            device_t dev;
            struct resource *res[1];
    };
    
    static struct resource_spec res_spec[] = {
            { SYS_RES_MEMORY, 0, RF_ACTIVE },
            { -1, 0 }
    };
    
    static int mv_rtc_probe(device_t dev);
    static int mv_rtc_attach(device_t dev);
    
    static int mv_rtc_gettime(device_t dev, struct timespec *ts);
    static int mv_rtc_settime(device_t dev, struct timespec *ts);
    
    static uint32_t mv_rtc_reg_read(struct mv_rtc_softc *sc, bus_size_t off);
    static int mv_rtc_reg_write(struct mv_rtc_softc *sc, bus_size_t off,
        uint32_t val);
    
    static device_method_t mv_rtc_methods[] = {
            DEVMETHOD(device_probe,         mv_rtc_probe),
            DEVMETHOD(device_attach,        mv_rtc_attach),
    
            DEVMETHOD(clock_gettime,        mv_rtc_gettime),
            DEVMETHOD(clock_settime,        mv_rtc_settime),
    
            { 0, 0 },
    };
    
    static driver_t mv_rtc_driver = {
            "rtc",
            mv_rtc_methods,
            sizeof(struct mv_rtc_softc),
    };
    static devclass_t mv_rtc_devclass;
    
    DRIVER_MODULE(mv_rtc, simplebus, mv_rtc_driver, mv_rtc_devclass, 0, 0);
    
    static int
    mv_rtc_probe(device_t dev)
   {
   
           if (!ofw_bus_status_okay(dev))
                   return (ENXIO);
   
           if (!ofw_bus_is_compatible(dev, "mrvl,rtc"))
                   return (ENXIO);
   
           device_set_desc(dev, "Marvell Integrated RTC");
           return (BUS_PROBE_DEFAULT);
   }
   
   static int
   mv_rtc_attach(device_t dev)
   {
           struct mv_rtc_softc *sc;
   
           sc = device_get_softc(dev);
           sc->dev = dev;
   
           clock_register(dev, 1000000);
   
           if (bus_alloc_resources(dev, res_spec, sc->res)) {
                   device_printf(dev, "could not allocate resources\n");
                   return (ENXIO);
           }
   
           return (0);
   }
   
   static int
   mv_rtc_gettime(device_t dev, struct timespec *ts)
   {
           struct clocktime ct;
           struct mv_rtc_softc *sc;
           uint32_t val;
   
           sc = device_get_softc(dev);
   
           val = mv_rtc_reg_read(sc, MV_RTC_TIME_REG);
   
           ct.nsec = 0;
           ct.sec = FROMBCD(val & 0x7f);
           ct.min = FROMBCD((val & 0x7f00) >> 8);
           ct.hour = FROMBCD((val & 0x3f0000) >> 16);
           ct.dow = FROMBCD((val & 0x7000000) >> 24) - 1;
   
           val = mv_rtc_reg_read(sc, MV_RTC_DATE_REG);
   
           ct.day = FROMBCD(val & 0x7f);
           ct.mon = FROMBCD((val & 0x1f00) >> 8);
           ct.year = YEAR_BASE + FROMBCD((val & 0xff0000) >> 16);
   
           return (clock_ct_to_ts(&ct, ts));
   }
   
   static int
   mv_rtc_settime(device_t dev, struct timespec *ts)
   {
           struct clocktime ct;
           struct mv_rtc_softc *sc;
           uint32_t val;
   
           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);
   
           val = TOBCD(ct.sec) | (TOBCD(ct.min) << 8) |
               (TOBCD(ct.hour) << 16) | (TOBCD( ct.dow + 1) << 24);
           mv_rtc_reg_write(sc, MV_RTC_TIME_REG, val);
   
           val = TOBCD(ct.day) | (TOBCD(ct.mon) << 8) |
               (TOBCD(ct.year - YEAR_BASE) << 16);
           mv_rtc_reg_write(sc, MV_RTC_DATE_REG, val);
   
           return (0);
   }
   
   static uint32_t
   mv_rtc_reg_read(struct mv_rtc_softc *sc, bus_size_t off)
   {
   
           return (bus_read_4(sc->res[0], off));
   }
   
   static int
   mv_rtc_reg_write(struct mv_rtc_softc *sc, bus_size_t off, uint32_t val)
   {
   
           bus_write_4(sc->res[0], off, val);
           return (0);
   }

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