freebsd-skq/sys/powerpc/powermac/platform_powermac.c
nwhitehorn d4fc9fa205 Allow PowerMac systems to be booted from an FDT as well as Open Firmware.
This is not complete yet: the gem(4) interface on my laptop seems to
disappear from the PCI bus as a result of quiescing Open Firmware in the
boot loader.
2015-03-10 16:01:43 +00:00

407 lines
9.5 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/altivec.h> /* For save_vec() */
#include <machine/bus.h>
#include <machine/cpu.h>
#include <machine/fpu.h> /* For save_fpu() */
#include <machine/hid.h>
#include <machine/platformvar.h>
#include <machine/pmap.h>
#include <machine/setjmp.h>
#include <machine/smp.h>
#include <machine/spr.h>
#include <dev/ofw/openfirm.h>
#include <machine/ofw_machdep.h>
#include "platform_if.h"
extern void *ap_pcpu;
static int powermac_probe(platform_t);
static int powermac_attach(platform_t);
void powermac_mem_regions(platform_t, struct mem_region *phys, int *physsz,
struct mem_region *avail, int *availsz);
static u_long powermac_timebase_freq(platform_t, struct cpuref *cpuref);
static int powermac_smp_first_cpu(platform_t, struct cpuref *cpuref);
static int powermac_smp_next_cpu(platform_t, struct cpuref *cpuref);
static int powermac_smp_get_bsp(platform_t, struct cpuref *cpuref);
static int powermac_smp_start_cpu(platform_t, struct pcpu *cpu);
static void powermac_reset(platform_t);
static void powermac_sleep(platform_t);
static platform_method_t powermac_methods[] = {
PLATFORMMETHOD(platform_probe, powermac_probe),
PLATFORMMETHOD(platform_attach, powermac_attach),
PLATFORMMETHOD(platform_mem_regions, powermac_mem_regions),
PLATFORMMETHOD(platform_timebase_freq, powermac_timebase_freq),
PLATFORMMETHOD(platform_smp_first_cpu, powermac_smp_first_cpu),
PLATFORMMETHOD(platform_smp_next_cpu, powermac_smp_next_cpu),
PLATFORMMETHOD(platform_smp_get_bsp, powermac_smp_get_bsp),
PLATFORMMETHOD(platform_smp_start_cpu, powermac_smp_start_cpu),
PLATFORMMETHOD(platform_reset, powermac_reset),
PLATFORMMETHOD(platform_sleep, powermac_sleep),
PLATFORMMETHOD_END
};
static platform_def_t powermac_platform = {
"powermac",
powermac_methods,
0
};
PLATFORM_DEF(powermac_platform);
static int
powermac_probe(platform_t plat)
{
char compat[255];
ssize_t compatlen;
char *curstr;
phandle_t root;
root = OF_peer(0);
if (root == 0)
return (ENXIO);
compatlen = OF_getprop(root, "compatible", compat, sizeof(compat));
for (curstr = compat; curstr < compat + compatlen;
curstr += strlen(curstr) + 1) {
if (strncmp(curstr, "MacRISC", 7) == 0)
return (BUS_PROBE_SPECIFIC);
}
return (ENXIO);
}
void
powermac_mem_regions(platform_t plat, struct mem_region *phys, int *physsz,
struct mem_region *avail, int *availsz)
{
phandle_t memory;
cell_t memoryprop[PHYS_AVAIL_SZ * 2];
ssize_t propsize, i, j;
int physacells = 1;
memory = OF_finddevice("/memory");
if (memory == -1)
memory = OF_finddevice("/memory@0");
/* "reg" has variable #address-cells, but #size-cells is always 1 */
OF_getprop(OF_parent(memory), "#address-cells", &physacells,
sizeof(physacells));
propsize = OF_getprop(memory, "reg", memoryprop, sizeof(memoryprop));
propsize /= sizeof(cell_t);
for (i = 0, j = 0; i < propsize; i += physacells+1, j++) {
phys[j].mr_start = memoryprop[i];
if (physacells == 2) {
#ifndef __powerpc64__
/* On 32-bit PPC, ignore regions starting above 4 GB */
if (memoryprop[i] != 0) {
j--;
continue;
}
#else
phys[j].mr_start <<= 32;
#endif
phys[j].mr_start |= memoryprop[i+1];
}
phys[j].mr_size = memoryprop[i + physacells];
}
*physsz = j;
/* "available" always has #address-cells = 1 */
propsize = OF_getprop(memory, "available", memoryprop,
sizeof(memoryprop));
if (propsize <= 0) {
for (i = 0; i < *physsz; i++) {
avail[i].mr_start = phys[i].mr_start;
avail[i].mr_size = phys[i].mr_size;
}
*availsz = *physsz;
} else {
propsize /= sizeof(cell_t);
for (i = 0, j = 0; i < propsize; i += 2, j++) {
avail[j].mr_start = memoryprop[i];
avail[j].mr_size = memoryprop[i + 1];
}
#ifdef __powerpc64__
/* Add in regions above 4 GB to the available list */
for (i = 0; i < *physsz; i++) {
if (phys[i].mr_start > BUS_SPACE_MAXADDR_32BIT) {
avail[j].mr_start = phys[i].mr_start;
avail[j].mr_size = phys[i].mr_size;
j++;
}
}
#endif
*availsz = j;
}
}
static int
powermac_attach(platform_t plat)
{
phandle_t rootnode;
char model[32];
/*
* Quiesce Open Firmware on PowerMac11,2 and 12,1. It is
* necessary there to shut down a background thread doing fan
* management, and is harmful on other machines (it will make OF
* shut off power to various system components it had turned on).
*
* Note: we don't need to worry about which OF module we are
* using since this is called only from very early boot, within
* OF's boot context.
*/
rootnode = OF_finddevice("/");
if (OF_getprop(rootnode, "model", model, sizeof(model)) > 0) {
if (strcmp(model, "PowerMac11,2") == 0 ||
strcmp(model, "PowerMac12,1") == 0) {
ofw_quiesce();
}
}
return (0);
}
static u_long
powermac_timebase_freq(platform_t plat, struct cpuref *cpuref)
{
phandle_t phandle;
int32_t 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
powermac_smp_fill_cpuref(struct cpuref *cpuref, phandle_t cpu)
{
cell_t cpuid;
int 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
powermac_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 == -1)
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 (powermac_smp_fill_cpuref(cpuref, cpu));
}
static int
powermac_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 (powermac_smp_fill_cpuref(cpuref, cpu));
}
static int
powermac_smp_get_bsp(platform_t plat, struct cpuref *cpuref)
{
ihandle_t inst;
phandle_t bsp, chosen;
int res;
chosen = OF_finddevice("/chosen");
if (chosen == -1)
return (ENXIO);
res = OF_getprop(chosen, "cpu", &inst, sizeof(inst));
if (res < 0)
return (ENXIO);
bsp = OF_instance_to_package(inst);
return (powermac_smp_fill_cpuref(cpuref, bsp));
}
static int
powermac_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) {
reset = 0x58;
switch (pc->pc_cpuid) {
case 0:
reset += 0x03;
break;
case 1:
reset += 0x04;
break;
case 2:
reset += 0x0f;
break;
case 3:
reset += 0x10;
break;
default:
return (ENXIO);
}
}
ap_pcpu = pc;
if (rstvec_virtbase == NULL)
rstvec_virtbase = pmap_mapdev(0x80000000, PAGE_SIZE);
rstvec = rstvec_virtbase + reset;
*rstvec = 4;
powerpc_sync();
(void)(*rstvec);
powerpc_sync();
DELAY(1);
*rstvec = 0;
powerpc_sync();
(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
}
static void
powermac_reset(platform_t platform)
{
OF_reboot();
}
void
powermac_sleep(platform_t platform)
{
*(unsigned long *)0x80 = 0x100;
cpu_sleep();
}