freebsd-dev/sys/powerpc/aim/platform_chrp.c
Nathan Whitehorn 999987e51a Add SMP support on U3-based G5 systems. This does not yet work perfectly:
at least on my Xserve, getting the decrementer and timebase on APs to tick
requires setting up a clock chip over I2C, which is not yet done.

While here, correct the 64-bit tlbie function to set the CPU to 64-bit
mode correctly.

Hardware donated by:	grehan
2009-10-23 03:17:02 +00:00

260 lines
6.0 KiB
C

/*-
* Copyright (c) 2008 Marcel Moolenaar
* Copyright (c) 2009 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 ``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("$FreeBSD$");
#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 <vm/vm.h>
#include <vm/pmap.h>
#include <machine/bus.h>
#include <machine/cpu.h>
#include <machine/hid.h>
#include <machine/platformvar.h>
#include <machine/pmap.h>
#include <machine/smp.h>
#include <machine/spr.h>
#include <dev/ofw/openfirm.h>
#include <machine/ofw_machdep.h>
#include "platform_if.h"
#ifdef SMP
extern void *ap_pcpu;
#endif
static int chrp_probe(platform_t);
void chrp_mem_regions(platform_t, struct mem_region **phys, int *physsz,
struct mem_region **avail, int *availsz);
static u_long chrp_timebase_freq(platform_t, struct cpuref *cpuref);
static int chrp_smp_first_cpu(platform_t, struct cpuref *cpuref);
static int chrp_smp_next_cpu(platform_t, struct cpuref *cpuref);
static int chrp_smp_get_bsp(platform_t, struct cpuref *cpuref);
static int chrp_smp_start_cpu(platform_t, struct pcpu *cpu);
static platform_method_t chrp_methods[] = {
PLATFORMMETHOD(platform_probe, chrp_probe),
PLATFORMMETHOD(platform_mem_regions, chrp_mem_regions),
PLATFORMMETHOD(platform_timebase_freq, chrp_timebase_freq),
PLATFORMMETHOD(platform_smp_first_cpu, chrp_smp_first_cpu),
PLATFORMMETHOD(platform_smp_next_cpu, chrp_smp_next_cpu),
PLATFORMMETHOD(platform_smp_get_bsp, chrp_smp_get_bsp),
PLATFORMMETHOD(platform_smp_start_cpu, chrp_smp_start_cpu),
{ 0, 0 }
};
static platform_def_t chrp_platform = {
"chrp",
chrp_methods,
0
};
PLATFORM_DEF(chrp_platform);
static int
chrp_probe(platform_t plat)
{
if (OF_finddevice("/memory") != -1)
return (BUS_PROBE_GENERIC);
return (ENXIO);
}
void
chrp_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
chrp_timebase_freq(platform_t plat, struct cpuref *cpuref)
{
phandle_t phandle;
long ticks = -1;
phandle = cpuref->cr_hwref;
OF_getprop(phandle, "timebase-frequency", &ticks, sizeof(ticks));
if (ticks <= 0)
panic("Unable to determine timebase frequency!");
return (ticks);
}
static int
chrp_smp_fill_cpuref(struct cpuref *cpuref, phandle_t cpu)
{
int cpuid, res;
cpuref->cr_hwref = cpu;
res = OF_getprop(cpu, "reg", &cpuid, sizeof(cpuid));
/*
* psim doesn't have a reg property, so assume 0 as for the
* uniprocessor case in the CHRP spec.
*/
if (res < 0) {
cpuid = 0;
}
cpuref->cr_cpuid = cpuid & 0xff;
return (0);
}
static int
chrp_smp_first_cpu(platform_t plat, struct cpuref *cpuref)
{
char buf[8];
phandle_t cpu, dev, root;
int res;
root = OF_peer(0);
dev = OF_child(root);
while (dev != 0) {
res = OF_getprop(dev, "name", buf, sizeof(buf));
if (res > 0 && strcmp(buf, "cpus") == 0)
break;
dev = OF_peer(dev);
}
if (dev == 0) {
/*
* psim doesn't have a name property on the /cpus node,
* but it can be found directly
*/
dev = OF_finddevice("/cpus");
if (dev == 0)
return (ENOENT);
}
cpu = OF_child(dev);
while (cpu != 0) {
res = OF_getprop(cpu, "device_type", buf, sizeof(buf));
if (res > 0 && strcmp(buf, "cpu") == 0)
break;
cpu = OF_peer(cpu);
}
if (cpu == 0)
return (ENOENT);
return (chrp_smp_fill_cpuref(cpuref, cpu));
}
static int
chrp_smp_next_cpu(platform_t plat, struct cpuref *cpuref)
{
char buf[8];
phandle_t cpu;
int res;
cpu = OF_peer(cpuref->cr_hwref);
while (cpu != 0) {
res = OF_getprop(cpu, "device_type", buf, sizeof(buf));
if (res > 0 && strcmp(buf, "cpu") == 0)
break;
cpu = OF_peer(cpu);
}
if (cpu == 0)
return (ENOENT);
return (chrp_smp_fill_cpuref(cpuref, cpu));
}
static int
chrp_smp_get_bsp(platform_t plat, struct cpuref *cpuref)
{
ihandle_t inst;
phandle_t bsp, chosen;
int res;
chosen = OF_finddevice("/chosen");
if (chosen == 0)
return (ENXIO);
res = OF_getprop(chosen, "cpu", &inst, sizeof(inst));
if (res < 0)
return (ENXIO);
bsp = OF_instance_to_package(inst);
return (chrp_smp_fill_cpuref(cpuref, bsp));
}
static int
chrp_smp_start_cpu(platform_t plat, struct pcpu *pc)
{
#ifdef SMP
phandle_t cpu;
volatile uint8_t *rstvec;
static volatile uint8_t *rstvec_virtbase = NULL;
int res, reset, timeout;
cpu = pc->pc_hwref;
res = OF_getprop(cpu, "soft-reset", &reset, sizeof(reset));
if (res < 0)
return (ENXIO);
ap_pcpu = pc;
if (rstvec_virtbase == NULL)
rstvec_virtbase = pmap_mapdev(0x80000000, PAGE_SIZE);
rstvec = rstvec_virtbase + reset;
*rstvec = 4;
(void)(*rstvec);
powerpc_sync();
DELAY(1);
*rstvec = 0;
(void)(*rstvec);
powerpc_sync();
timeout = 10000;
while (!pc->pc_awake && timeout--)
DELAY(100);
return ((pc->pc_awake) ? 0 : EBUSY);
#else
/* No SMP support */
return (ENXIO);
#endif
}