FreeBSD/Linux Kernel Cross Reference
sys/powerpc/pseries/rtas_dev.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2011 Nathan Whitehorn
      * 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("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/module.h>
    #include <sys/bus.h>
    #include <sys/conf.h>
    #include <sys/clock.h>
    #include <sys/cpu.h>
    #include <sys/eventhandler.h>
    #include <sys/kernel.h>
    #include <sys/reboot.h>
    #include <sys/sysctl.h>
    
    #include <dev/ofw/ofw_bus.h>
    #include <dev/ofw/openfirm.h>
    
    #include <machine/rtas.h>
    
    #include "clock_if.h"
    
    static int      rtasdev_probe(device_t);
    static int      rtasdev_attach(device_t);
    /* clock interface */
    static int      rtas_gettime(device_t dev, struct timespec *ts);
    static int      rtas_settime(device_t dev, struct timespec *ts);
    
    static void     rtas_shutdown(void *arg, int howto);
    
    static device_method_t  rtasdev_methods[] = {
            /* Device interface */
            DEVMETHOD(device_probe,         rtasdev_probe),
            DEVMETHOD(device_attach,        rtasdev_attach),
    
            /* clock interface */
            DEVMETHOD(clock_gettime,        rtas_gettime),
            DEVMETHOD(clock_settime,        rtas_settime),
    
            { 0, 0 },
    };
    
    static driver_t rtasdev_driver = {
            "rtas",
            rtasdev_methods,
            0
    };
    
    DRIVER_MODULE(rtasdev, ofwbus, rtasdev_driver, 0, 0);
    
    static int
    rtasdev_probe(device_t dev)
    {
            const char *name = ofw_bus_get_name(dev);
    
            if (strcmp(name, "rtas") != 0)
                    return (ENXIO);
            if (!rtas_exists())
                    return (ENXIO);
    
            device_set_desc(dev, "Run-Time Abstraction Services");
            return (0);
    }
    
    static int
    rtasdev_attach(device_t dev)
    {
            if (rtas_token_lookup("get-time-of-day") != -1)
                    clock_register(dev, 2000);
    
            EVENTHANDLER_REGISTER(shutdown_final, rtas_shutdown, NULL,
               SHUTDOWN_PRI_LAST);
   
           return (0);
   }
   
   static int
   rtas_gettime(device_t dev, struct timespec *ts) {
           struct clocktime ct;
           cell_t tod[8];
           cell_t token;
           int error;
   
           token = rtas_token_lookup("get-time-of-day");
           if (token == -1)
                   return (ENXIO);
           error = rtas_call_method(token, 0, 8, &tod[0], &tod[1], &tod[2],
               &tod[3], &tod[4], &tod[5], &tod[6], &tod[7]);
           if (error < 0)
                   return (ENXIO);
           if (tod[0] != 0)
                   return ((tod[0] == -1) ? ENXIO : EAGAIN);
   
           ct.year = tod[1];
           ct.mon  = tod[2];
           ct.day  = tod[3];
           ct.hour = tod[4];
           ct.min  = tod[5];
           ct.sec  = tod[6];
           ct.nsec = tod[7];
   
           return (clock_ct_to_ts(&ct, ts));
   }
   
   static int
   rtas_settime(device_t dev, struct timespec *ts)
   {
           struct clocktime ct;
           cell_t token, status;
           int error;
   
           token = rtas_token_lookup("set-time-of-day");
           if (token == -1)
                   return (ENXIO);
   
           clock_ts_to_ct(ts, &ct);
           error = rtas_call_method(token, 7, 1, ct.year, ct.mon, ct.day, ct.hour,
               ct.min, ct.sec, ct.nsec, &status);
           if (error < 0)
                   return (ENXIO);
           if (status != 0)
                   return (((int)status < 0) ? ENXIO : EAGAIN);
   
           return (0);
   }
   
   static void
   rtas_shutdown(void *arg, int howto)
   {
           cell_t token, status;
   
           if (howto & RB_HALT) {
                   token = rtas_token_lookup("power-off");
                   if (token == -1)
                           return;
   
                   rtas_call_method(token, 2, 1, 0, 0, &status);
           } else {
                   token = rtas_token_lookup("system-reboot");
                   if (token == -1)
                           return;
   
                   rtas_call_method(token, 0, 1, &status);
           }
   }

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