691df1a1f8
This is a critical condition and can lead to all sorts of misterious hangs if not handled. Obtained from: Semihalf Also reported by: thompsa
325 lines
7.9 KiB
C
325 lines
7.9 KiB
C
/*-
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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 <machine/bus.h>
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#include <machine/cpu.h>
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#include <machine/hid.h>
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#include <machine/platform.h>
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#include <machine/platformvar.h>
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#include <machine/smp.h>
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#include <machine/spr.h>
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#include <machine/vmparam.h>
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#include <dev/fdt/fdt_common.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include <dev/ofw/openfirm.h>
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#include <powerpc/mpc85xx/mpc85xx.h>
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#include "platform_if.h"
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#ifdef SMP
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extern void *ap_pcpu;
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extern uint8_t __boot_page[]; /* Boot page body */
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extern uint32_t bp_kernload; /* Kernel physical load address */
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extern uint32_t bp_trace; /* AP boot trace field */
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#endif
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extern uint32_t *bootinfo;
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static int cpu, maxcpu;
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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 int bare_smp_first_cpu(platform_t, struct cpuref *cpuref);
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static int bare_smp_next_cpu(platform_t, struct cpuref *cpuref);
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static int bare_smp_get_bsp(platform_t, struct cpuref *cpuref);
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static int bare_smp_start_cpu(platform_t, struct pcpu *cpu);
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static void booke_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_smp_first_cpu, bare_smp_first_cpu),
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PLATFORMMETHOD(platform_smp_next_cpu, bare_smp_next_cpu),
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PLATFORMMETHOD(platform_smp_get_bsp, bare_smp_get_bsp),
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PLATFORMMETHOD(platform_smp_start_cpu, bare_smp_start_cpu),
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PLATFORMMETHOD(platform_reset, booke_reset),
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{ 0, 0 }
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};
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static platform_def_t bare_platform = {
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"bare metal",
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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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phandle_t cpus, child;
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uint32_t sr;
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int i, law_max, tgt;
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if ((cpus = OF_finddevice("/cpus")) != 0) {
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for (maxcpu = 0, child = OF_child(cpus); child != 0;
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child = OF_peer(child), maxcpu++)
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;
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} else
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maxcpu = 1;
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/*
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* Clear local access windows. Skip DRAM entries, so we don't shoot
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* ourselves in the foot.
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*/
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law_max = law_getmax();
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for (i = 0; i < law_max; i++) {
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sr = ccsr_read4(OCP85XX_LAWSR(i));
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if ((sr & 0x80000000) == 0)
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continue;
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tgt = (sr & 0x01f00000) >> 20;
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if (tgt == OCP85XX_TGTIF_RAM1 || tgt == OCP85XX_TGTIF_RAM2 ||
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tgt == OCP85XX_TGTIF_RAM_INTL)
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continue;
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ccsr_write4(OCP85XX_LAWSR(i), sr & 0x7fffffff);
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}
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return (BUS_PROBE_GENERIC);
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}
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#define MEM_REGIONS 8
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static struct mem_region avail_regions[MEM_REGIONS];
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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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uint32_t memsize;
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int i, rv;
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rv = fdt_get_mem_regions(avail_regions, availsz, &memsize);
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if (rv != 0)
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panic("%s: could not retrieve mem regions from the 'memory' "
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"node, error: %d", __func__, rv);
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for (i = 0; i < *availsz; i++) {
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if (avail_regions[i].mr_start < 1048576) {
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avail_regions[i].mr_size =
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avail_regions[i].mr_size -
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(1048576 - avail_regions[i].mr_start);
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avail_regions[i].mr_start = 1048576;
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}
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}
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*avail = avail_regions;
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/* On the bare metal platform phys == avail memory */
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*physsz = *availsz;
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*phys = *avail;
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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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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 int
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bare_smp_first_cpu(platform_t plat, struct cpuref *cpuref)
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{
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cpu = 0;
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cpuref->cr_cpuid = cpu;
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cpuref->cr_hwref = cpuref->cr_cpuid;
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if (bootverbose)
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printf("powerpc_smp_first_cpu: cpuid %d\n", cpuref->cr_cpuid);
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cpu++;
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return (0);
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}
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static int
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bare_smp_next_cpu(platform_t plat, struct cpuref *cpuref)
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{
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if (cpu >= maxcpu)
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return (ENOENT);
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cpuref->cr_cpuid = cpu++;
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cpuref->cr_hwref = cpuref->cr_cpuid;
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if (bootverbose)
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printf("powerpc_smp_next_cpu: cpuid %d\n", cpuref->cr_cpuid);
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return (0);
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}
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static int
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bare_smp_get_bsp(platform_t plat, struct cpuref *cpuref)
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{
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cpuref->cr_cpuid = mfspr(SPR_PIR);
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cpuref->cr_hwref = cpuref->cr_cpuid;
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return (0);
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}
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static int
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bare_smp_start_cpu(platform_t plat, struct pcpu *pc)
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{
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#ifdef SMP
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uint32_t bptr, eebpcr;
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int timeout;
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eebpcr = ccsr_read4(OCP85XX_EEBPCR);
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if ((eebpcr & (1 << (pc->pc_cpuid + 24))) != 0) {
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printf("SMP: CPU %d already out of hold-off state!\n",
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pc->pc_cpuid);
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return (ENXIO);
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}
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ap_pcpu = pc;
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__asm __volatile("msync; isync");
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/*
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* Set BPTR to the physical address of the boot page
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*/
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bptr = ((uint32_t)__boot_page - KERNBASE) + bp_kernload;
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ccsr_write4(OCP85XX_BPTR, (bptr >> 12) | 0x80000000);
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/*
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* Release AP from hold-off state
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*/
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bp_trace = 0;
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eebpcr |= (1 << (pc->pc_cpuid + 24));
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ccsr_write4(OCP85XX_EEBPCR, eebpcr);
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__asm __volatile("isync; msync");
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timeout = 500;
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while (!pc->pc_awake && timeout--)
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DELAY(1000); /* wait 1ms */
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/*
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* Disable boot page translation so that the 4K page at the default
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* address (= 0xfffff000) isn't permanently remapped and thus not
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* usable otherwise.
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*/
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ccsr_write4(OCP85XX_BPTR, 0);
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if (!pc->pc_awake)
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printf("SMP: CPU %d didn't wake up (trace code %#x).\n",
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pc->pc_awake, bp_trace);
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return ((pc->pc_awake) ? 0 : EBUSY);
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#else
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/* No SMP support */
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return (ENXIO);
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#endif
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}
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static void
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booke_reset(platform_t plat)
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{
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/*
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* Try the dedicated reset register first.
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* If the SoC doesn't have one, we'll fall
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* back to using the debug control register.
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*/
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ccsr_write4(OCP85XX_RSTCR, 2);
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/* Clear DBCR0, disables debug interrupts and events. */
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mtspr(SPR_DBCR0, 0);
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__asm __volatile("isync");
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/* Enable Debug Interrupts in MSR. */
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mtmsr(mfmsr() | PSL_DE);
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/* Enable debug interrupts and issue reset. */
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mtspr(SPR_DBCR0, mfspr(SPR_DBCR0) | DBCR0_IDM | DBCR0_RST_SYSTEM);
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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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