FreeBSD/Linux Kernel Cross Reference
sys/arm/lpc/lpc_rtc.c

     /*-
      * Copyright (c) 2011 Jakub Wojciech Klama <jceel@FreeBSD.org>
      * 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/10.2/sys/arm/lpc/lpc_rtc.c 266152 2014-05-15 16:11:06Z ian $");
    
    #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 <machine/resource.h>
    
    #include <dev/ofw/ofw_bus.h>
    #include <dev/ofw/ofw_bus_subr.h>
    
    #include <arm/lpc/lpcreg.h>
    
    #include "clock_if.h"
    
    struct lpc_rtc_softc {
            device_t                        lr_dev;
            struct resource *               lr_mem_res;
            bus_space_tag_t                 lr_bst;
            bus_space_handle_t              lr_bsh;
    };
    
    static int lpc_rtc_probe(device_t dev);
    static int lpc_rtc_attach(device_t dev);
    static int lpc_rtc_gettime(device_t dev, struct timespec *ts);
    static int lpc_rtc_settime(device_t, struct timespec *);
    
    static int
    lpc_rtc_probe(device_t dev)
    {
    
            if (!ofw_bus_status_okay(dev))
                    return (ENXIO);
    
            if (!ofw_bus_is_compatible(dev, "lpc,rtc"))
                    return (ENXIO);
    
            device_set_desc(dev, "LPC32x0 real time clock");
            return (BUS_PROBE_DEFAULT);
    }
    
    static int
    lpc_rtc_attach(device_t dev)
    {
            struct lpc_rtc_softc *sc = device_get_softc(dev);
            int rid = 0;
    
            sc->lr_dev = dev;
    
            clock_register(dev, 1000000);
    
            sc->lr_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
                RF_ACTIVE);
            if (!sc->lr_mem_res) {
                    device_printf(dev, "cannot allocate memory window\n");
                    return (ENXIO);
            }
    
            sc->lr_bst = rman_get_bustag(sc->lr_mem_res);
            sc->lr_bsh = rman_get_bushandle(sc->lr_mem_res);
    
            return (0);
    }
    
    static int
   lpc_rtc_gettime(device_t dev, struct timespec *ts)
   {
           struct lpc_rtc_softc *sc = device_get_softc(dev);
   
           ts->tv_sec = bus_space_read_4(sc->lr_bst, sc->lr_bsh, LPC_RTC_UCOUNT);
           ts->tv_nsec = 0;
   
           return (0);
   }
   
   static int
   lpc_rtc_settime(device_t dev, struct timespec *ts)
   {
           struct lpc_rtc_softc *sc = device_get_softc(dev);
           uint32_t ctrl;
   
           /* Stop RTC */
           ctrl = bus_space_read_4(sc->lr_bst, sc->lr_bsh, LPC_RTC_CTRL);
           bus_space_write_4(sc->lr_bst, sc->lr_bsh, LPC_RTC_CTRL, ctrl | LPC_RTC_CTRL_DISABLE);
   
           /* Write actual value */
           bus_space_write_4(sc->lr_bst, sc->lr_bsh, LPC_RTC_UCOUNT, ts->tv_sec);
   
           /* Start RTC */
           ctrl = bus_space_read_4(sc->lr_bst, sc->lr_bsh, LPC_RTC_CTRL);
           bus_space_write_4(sc->lr_bst, sc->lr_bsh, LPC_RTC_CTRL, ctrl & ~LPC_RTC_CTRL_DISABLE);
   
           return (0);     
   }
   
   static device_method_t lpc_rtc_methods[] = {
           /* Device interface */
           DEVMETHOD(device_probe,         lpc_rtc_probe),
           DEVMETHOD(device_attach,        lpc_rtc_attach),
   
           /* Clock interface */
           DEVMETHOD(clock_gettime,        lpc_rtc_gettime),
           DEVMETHOD(clock_settime,        lpc_rtc_settime),
   
           { 0, 0 },
   };
   
   static driver_t lpc_rtc_driver = {
           "rtc",
           lpc_rtc_methods,
           sizeof(struct lpc_rtc_softc),
   };
   
   static devclass_t lpc_rtc_devclass;
   
   DRIVER_MODULE(rtc, simplebus, lpc_rtc_driver, lpc_rtc_devclass, 0, 0);

Cache object: 5e49145d3ea24d0f5bad2e9e760af162