FreeBSD/Linux Kernel Cross Reference
sys/powerpc/booke/platform_bare.c

     /*-
      * Copyright (c) 2008-2012 Semihalf.
      * 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 ``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 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/11.0/sys/powerpc/booke/platform_bare.c 258807 2013-12-01 19:43:15Z nwhitehorn $");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/kernel.h>
    #include <sys/bus.h>
    #include <sys/pcpu.h>
    #include <sys/proc.h>
    #include <sys/smp.h>
    
    #include <dev/ofw/openfirm.h>
    
    #include <machine/platform.h>
    #include <machine/platformvar.h>
    
    #include "platform_if.h"
    
    extern uint32_t *bootinfo;
    
    static int bare_probe(platform_t);
    static void bare_mem_regions(platform_t, struct mem_region *phys, int *physsz,
        struct mem_region *avail, int *availsz);
    static u_long bare_timebase_freq(platform_t, struct cpuref *cpuref);
    
    static void bare_reset(platform_t);
    
    static platform_method_t bare_methods[] = {
            PLATFORMMETHOD(platform_probe,          bare_probe),
            PLATFORMMETHOD(platform_mem_regions,    bare_mem_regions),
            PLATFORMMETHOD(platform_timebase_freq,  bare_timebase_freq),
    
            PLATFORMMETHOD(platform_reset,          bare_reset),
    
            PLATFORMMETHOD_END
    };
    
    static platform_def_t bare_platform = {
            "bare",
            bare_methods,
            0
    };
    
    PLATFORM_DEF(bare_platform);
    
    static int
    bare_probe(platform_t plat)
    {
    
            if (OF_peer(0) == -1) /* Needs device tree to work */
                    return (ENXIO);
    
            return (BUS_PROBE_GENERIC);
    }
    
    void
    bare_mem_regions(platform_t plat, struct mem_region *phys, int *physsz,
        struct mem_region *avail, int *availsz)
    {
    
            ofw_mem_regions(phys, physsz, avail, availsz);
    }
    
    static u_long
    bare_timebase_freq(platform_t plat, struct cpuref *cpuref)
    {
            u_long ticks;
            phandle_t cpus, child;
            pcell_t freq;
    
            if (bootinfo != NULL) {
                    if (bootinfo[0] == 1) {
                            /* Backward compatibility. See 8-STABLE. */
                           ticks = bootinfo[3] >> 3;
                   } else {
                           /* Compatibility with Juniper's loader. */
                           ticks = bootinfo[5] >> 3;
                   }
           } else
                   ticks = 0;
   
           if ((cpus = OF_finddevice("/cpus")) == -1)
                   goto out;
   
           if ((child = OF_child(cpus)) == 0)
                   goto out;
   
           switch (OF_getproplen(child, "timebase-frequency")) {
           case 4:
           {
                   uint32_t tbase;
                   OF_getprop(child, "timebase-frequency", &tbase, sizeof(tbase));
                   ticks = tbase;
                   return (ticks);
           }
           case 8:
           {
                   uint64_t tbase;
                   OF_getprop(child, "timebase-frequency", &tbase, sizeof(tbase));
                   ticks = tbase;
                   return (ticks);
           }
           default:
                   break;
           }
   
           freq = 0;
           if (OF_getprop(child, "bus-frequency", (void *)&freq,
               sizeof(freq)) <= 0)
                   goto out;
   
           /*
            * Time Base and Decrementer are updated every 8 CCB bus clocks.
            * HID0[SEL_TBCLK] = 0
            */
           if (freq != 0)
                   ticks = freq / 8;
   
   out:
           if (ticks <= 0)
                   panic("Unable to determine timebase frequency!");
   
           return (ticks);
   }
   
   static void
   bare_reset(platform_t plat)
   {
   
           printf("Reset failed...\n");
           while (1)
                   ;
   }
   

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