162 lines
3.9 KiB
C
162 lines
3.9 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2008-2012 Semihalf.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/bus.h>
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#include <sys/pcpu.h>
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#include <sys/proc.h>
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#include <sys/smp.h>
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#include <dev/ofw/openfirm.h>
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#include <machine/platform.h>
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#include <machine/platformvar.h>
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#include "platform_if.h"
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extern uint32_t *bootinfo;
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static int bare_probe(platform_t);
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static void bare_mem_regions(platform_t, struct mem_region *phys, int *physsz,
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struct mem_region *avail, int *availsz);
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static u_long bare_timebase_freq(platform_t, struct cpuref *cpuref);
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static void bare_reset(platform_t);
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static platform_method_t bare_methods[] = {
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PLATFORMMETHOD(platform_probe, bare_probe),
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PLATFORMMETHOD(platform_mem_regions, bare_mem_regions),
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PLATFORMMETHOD(platform_timebase_freq, bare_timebase_freq),
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PLATFORMMETHOD(platform_reset, bare_reset),
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PLATFORMMETHOD_END
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};
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static platform_def_t bare_platform = {
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"bare",
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bare_methods,
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0
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};
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PLATFORM_DEF(bare_platform);
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static int
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bare_probe(platform_t plat)
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{
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if (OF_peer(0) == -1) /* Needs device tree to work */
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return (ENXIO);
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return (BUS_PROBE_GENERIC);
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}
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void
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bare_mem_regions(platform_t plat, struct mem_region *phys, int *physsz,
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struct mem_region *avail, int *availsz)
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{
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ofw_mem_regions(phys, physsz, avail, availsz);
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}
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static u_long
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bare_timebase_freq(platform_t plat, struct cpuref *cpuref)
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{
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u_long ticks;
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phandle_t cpus, child;
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pcell_t freq;
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if (bootinfo != NULL) {
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if (bootinfo[0] == 1) {
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/* Backward compatibility. See 8-STABLE. */
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ticks = bootinfo[3] >> 3;
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} else {
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/* Compatibility with Juniper's loader. */
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ticks = bootinfo[5] >> 3;
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}
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} else
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ticks = 0;
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if ((cpus = OF_finddevice("/cpus")) == -1)
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goto out;
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if ((child = OF_child(cpus)) == 0)
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goto out;
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switch (OF_getproplen(child, "timebase-frequency")) {
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case 4:
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{
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uint32_t tbase;
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OF_getprop(child, "timebase-frequency", &tbase, sizeof(tbase));
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ticks = tbase;
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return (ticks);
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}
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case 8:
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{
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uint64_t tbase;
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OF_getprop(child, "timebase-frequency", &tbase, sizeof(tbase));
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ticks = tbase;
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return (ticks);
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}
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default:
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break;
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}
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freq = 0;
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if (OF_getprop(child, "bus-frequency", (void *)&freq,
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sizeof(freq)) <= 0)
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goto out;
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/*
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* Time Base and Decrementer are updated every 8 CCB bus clocks.
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* HID0[SEL_TBCLK] = 0
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*/
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if (freq != 0)
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ticks = freq / 8;
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out:
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if (ticks <= 0)
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panic("Unable to determine timebase frequency!");
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return (ticks);
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}
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static void
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bare_reset(platform_t plat)
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{
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printf("Reset failed...\n");
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while (1)
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;
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}
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