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M7350/kernel/arch/powerpc/platforms/powermac/smp.c

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M7350v1_en_gpl
2024-09-09 08:52:07 +00:00
/*
* SMP support for power macintosh.
*
* We support both the old "powersurge" SMP architecture
* and the current Core99 (G4 PowerMac) machines.
*
* Note that we don't support the very first rev. of
* Apple/DayStar 2 CPUs board, the one with the funky
* watchdog. Hopefully, none of these should be there except
* maybe internally to Apple. I should probably still add some
* code to detect this card though and disable SMP. --BenH.
*
* Support Macintosh G4 SMP by Troy Benjegerdes (hozer@drgw.net)
* and Ben Herrenschmidt <benh@kernel.crashing.org>.
*
* Support for DayStar quad CPU cards
* Copyright (C) XLR8, Inc. 1994-2000
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/smp.h>
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/errno.h>
#include <linux/hardirq.h>
#include <linux/cpu.h>
#include <linux/compiler.h>
#include <asm/ptrace.h>
#include <linux/atomic.h>
#include <asm/code-patching.h>
#include <asm/irq.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/sections.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/smp.h>
#include <asm/machdep.h>
#include <asm/pmac_feature.h>
#include <asm/time.h>
#include <asm/mpic.h>
#include <asm/cacheflush.h>
#include <asm/keylargo.h>
#include <asm/pmac_low_i2c.h>
#include <asm/pmac_pfunc.h>
#include "pmac.h"
#undef DEBUG
#ifdef DEBUG
#define DBG(fmt...) udbg_printf(fmt)
#else
#define DBG(fmt...)
#endif
extern void __secondary_start_pmac_0(void);
extern int pmac_pfunc_base_install(void);
static void (*pmac_tb_freeze)(int freeze);
static u64 timebase;
static int tb_req;
#ifdef CONFIG_PPC_PMAC32_PSURGE
/*
* Powersurge (old powermac SMP) support.
*/
/* Addresses for powersurge registers */
#define HAMMERHEAD_BASE 0xf8000000
#define HHEAD_CONFIG 0x90
#define HHEAD_SEC_INTR 0xc0
/* register for interrupting the primary processor on the powersurge */
/* N.B. this is actually the ethernet ROM! */
#define PSURGE_PRI_INTR 0xf3019000
/* register for storing the start address for the secondary processor */
/* N.B. this is the PCI config space address register for the 1st bridge */
#define PSURGE_START 0xf2800000
/* Daystar/XLR8 4-CPU card */
#define PSURGE_QUAD_REG_ADDR 0xf8800000
#define PSURGE_QUAD_IRQ_SET 0
#define PSURGE_QUAD_IRQ_CLR 1
#define PSURGE_QUAD_IRQ_PRIMARY 2
#define PSURGE_QUAD_CKSTOP_CTL 3
#define PSURGE_QUAD_PRIMARY_ARB 4
#define PSURGE_QUAD_BOARD_ID 6
#define PSURGE_QUAD_WHICH_CPU 7
#define PSURGE_QUAD_CKSTOP_RDBK 8
#define PSURGE_QUAD_RESET_CTL 11
#define PSURGE_QUAD_OUT(r, v) (out_8(quad_base + ((r) << 4) + 4, (v)))
#define PSURGE_QUAD_IN(r) (in_8(quad_base + ((r) << 4) + 4) & 0x0f)
#define PSURGE_QUAD_BIS(r, v) (PSURGE_QUAD_OUT((r), PSURGE_QUAD_IN(r) | (v)))
#define PSURGE_QUAD_BIC(r, v) (PSURGE_QUAD_OUT((r), PSURGE_QUAD_IN(r) & ~(v)))
/* virtual addresses for the above */
static volatile u8 __iomem *hhead_base;
static volatile u8 __iomem *quad_base;
static volatile u32 __iomem *psurge_pri_intr;
static volatile u8 __iomem *psurge_sec_intr;
static volatile u32 __iomem *psurge_start;
/* values for psurge_type */
#define PSURGE_NONE -1
#define PSURGE_DUAL 0
#define PSURGE_QUAD_OKEE 1
#define PSURGE_QUAD_COTTON 2
#define PSURGE_QUAD_ICEGRASS 3
/* what sort of powersurge board we have */
static int psurge_type = PSURGE_NONE;
/* irq for secondary cpus to report */
static struct irq_domain *psurge_host;
int psurge_secondary_virq;
/*
* Set and clear IPIs for powersurge.
*/
static inline void psurge_set_ipi(int cpu)
{
if (psurge_type == PSURGE_NONE)
return;
if (cpu == 0)
in_be32(psurge_pri_intr);
else if (psurge_type == PSURGE_DUAL)
out_8(psurge_sec_intr, 0);
else
PSURGE_QUAD_OUT(PSURGE_QUAD_IRQ_SET, 1 << cpu);
}
static inline void psurge_clr_ipi(int cpu)
{
if (cpu > 0) {
switch(psurge_type) {
case PSURGE_DUAL:
out_8(psurge_sec_intr, ~0);
case PSURGE_NONE:
break;
default:
PSURGE_QUAD_OUT(PSURGE_QUAD_IRQ_CLR, 1 << cpu);
}
}
}
/*
* On powersurge (old SMP powermac architecture) we don't have
* separate IPIs for separate messages like openpic does. Instead
* use the generic demux helpers
* -- paulus.
*/
static irqreturn_t psurge_ipi_intr(int irq, void *d)
{
psurge_clr_ipi(smp_processor_id());
smp_ipi_demux();
return IRQ_HANDLED;
}
static void smp_psurge_cause_ipi(int cpu, unsigned long data)
{
psurge_set_ipi(cpu);
}
static int psurge_host_map(struct irq_domain *h, unsigned int virq,
irq_hw_number_t hw)
{
irq_set_chip_and_handler(virq, &dummy_irq_chip, handle_percpu_irq);
return 0;
}
static const struct irq_domain_ops psurge_host_ops = {
.map = psurge_host_map,
};
static int psurge_secondary_ipi_init(void)
{
int rc = -ENOMEM;
psurge_host = irq_domain_add_nomap(NULL, 0, &psurge_host_ops, NULL);
if (psurge_host)
psurge_secondary_virq = irq_create_direct_mapping(psurge_host);
if (psurge_secondary_virq)
rc = request_irq(psurge_secondary_virq, psurge_ipi_intr,
IRQF_PERCPU | IRQF_NO_THREAD, "IPI", NULL);
if (rc)
pr_err("Failed to setup secondary cpu IPI\n");
return rc;
}
/*
* Determine a quad card presence. We read the board ID register, we
* force the data bus to change to something else, and we read it again.
* It it's stable, then the register probably exist (ugh !)
*/
static int __init psurge_quad_probe(void)
{
int type;
unsigned int i;
type = PSURGE_QUAD_IN(PSURGE_QUAD_BOARD_ID);
if (type < PSURGE_QUAD_OKEE || type > PSURGE_QUAD_ICEGRASS
|| type != PSURGE_QUAD_IN(PSURGE_QUAD_BOARD_ID))
return PSURGE_DUAL;
/* looks OK, try a slightly more rigorous test */
/* bogus is not necessarily cacheline-aligned,
though I don't suppose that really matters. -- paulus */
for (i = 0; i < 100; i++) {
volatile u32 bogus[8];
bogus[(0+i)%8] = 0x00000000;
bogus[(1+i)%8] = 0x55555555;
bogus[(2+i)%8] = 0xFFFFFFFF;
bogus[(3+i)%8] = 0xAAAAAAAA;
bogus[(4+i)%8] = 0x33333333;
bogus[(5+i)%8] = 0xCCCCCCCC;
bogus[(6+i)%8] = 0xCCCCCCCC;
bogus[(7+i)%8] = 0x33333333;
wmb();
asm volatile("dcbf 0,%0" : : "r" (bogus) : "memory");
mb();
if (type != PSURGE_QUAD_IN(PSURGE_QUAD_BOARD_ID))
return PSURGE_DUAL;
}
return type;
}
static void __init psurge_quad_init(void)
{
int procbits;
if (ppc_md.progress) ppc_md.progress("psurge_quad_init", 0x351);
procbits = ~PSURGE_QUAD_IN(PSURGE_QUAD_WHICH_CPU);
if (psurge_type == PSURGE_QUAD_ICEGRASS)
PSURGE_QUAD_BIS(PSURGE_QUAD_RESET_CTL, procbits);
else
PSURGE_QUAD_BIC(PSURGE_QUAD_CKSTOP_CTL, procbits);
mdelay(33);
out_8(psurge_sec_intr, ~0);
PSURGE_QUAD_OUT(PSURGE_QUAD_IRQ_CLR, procbits);
PSURGE_QUAD_BIS(PSURGE_QUAD_RESET_CTL, procbits);
if (psurge_type != PSURGE_QUAD_ICEGRASS)
PSURGE_QUAD_BIS(PSURGE_QUAD_CKSTOP_CTL, procbits);
PSURGE_QUAD_BIC(PSURGE_QUAD_PRIMARY_ARB, procbits);
mdelay(33);
PSURGE_QUAD_BIC(PSURGE_QUAD_RESET_CTL, procbits);
mdelay(33);
PSURGE_QUAD_BIS(PSURGE_QUAD_PRIMARY_ARB, procbits);
mdelay(33);
}
static int __init smp_psurge_probe(void)
{
int i, ncpus;
struct device_node *dn;
/* We don't do SMP on the PPC601 -- paulus */
if (PVR_VER(mfspr(SPRN_PVR)) == 1)
return 1;
/*
* The powersurge cpu board can be used in the generation
* of powermacs that have a socket for an upgradeable cpu card,
* including the 7500, 8500, 9500, 9600.
* The device tree doesn't tell you if you have 2 cpus because
* OF doesn't know anything about the 2nd processor.
* Instead we look for magic bits in magic registers,
* in the hammerhead memory controller in the case of the
* dual-cpu powersurge board. -- paulus.
*/
dn = of_find_node_by_name(NULL, "hammerhead");
if (dn == NULL)
return 1;
of_node_put(dn);
hhead_base = ioremap(HAMMERHEAD_BASE, 0x800);
quad_base = ioremap(PSURGE_QUAD_REG_ADDR, 1024);
psurge_sec_intr = hhead_base + HHEAD_SEC_INTR;
psurge_type = psurge_quad_probe();
if (psurge_type != PSURGE_DUAL) {
psurge_quad_init();
/* All released cards using this HW design have 4 CPUs */
ncpus = 4;
/* No sure how timebase sync works on those, let's use SW */
smp_ops->give_timebase = smp_generic_give_timebase;
smp_ops->take_timebase = smp_generic_take_timebase;
} else {
iounmap(quad_base);
if ((in_8(hhead_base + HHEAD_CONFIG) & 0x02) == 0) {
/* not a dual-cpu card */
iounmap(hhead_base);
psurge_type = PSURGE_NONE;
return 1;
}
ncpus = 2;
}
if (psurge_secondary_ipi_init())
return 1;
psurge_start = ioremap(PSURGE_START, 4);
psurge_pri_intr = ioremap(PSURGE_PRI_INTR, 4);
/* This is necessary because OF doesn't know about the
* secondary cpu(s), and thus there aren't nodes in the
* device tree for them, and smp_setup_cpu_maps hasn't
* set their bits in cpu_present_mask.
*/
if (ncpus > NR_CPUS)
ncpus = NR_CPUS;
for (i = 1; i < ncpus ; ++i)
set_cpu_present(i, true);
if (ppc_md.progress) ppc_md.progress("smp_psurge_probe - done", 0x352);
return ncpus;
}
static int __init smp_psurge_kick_cpu(int nr)
{
unsigned long start = __pa(__secondary_start_pmac_0) + nr * 8;
unsigned long a, flags;
int i, j;
/* Defining this here is evil ... but I prefer hiding that
* crap to avoid giving people ideas that they can do the
* same.
*/
extern volatile unsigned int cpu_callin_map[NR_CPUS];
/* may need to flush here if secondary bats aren't setup */
for (a = KERNELBASE; a < KERNELBASE + 0x800000; a += 32)
asm volatile("dcbf 0,%0" : : "r" (a) : "memory");
asm volatile("sync");
if (ppc_md.progress) ppc_md.progress("smp_psurge_kick_cpu", 0x353);
/* This is going to freeze the timeebase, we disable interrupts */
local_irq_save(flags);
out_be32(psurge_start, start);
mb();
psurge_set_ipi(nr);
/*
* We can't use udelay here because the timebase is now frozen.
*/
for (i = 0; i < 2000; ++i)
asm volatile("nop" : : : "memory");
psurge_clr_ipi(nr);
/*
* Also, because the timebase is frozen, we must not return to the
* caller which will try to do udelay's etc... Instead, we wait -here-
* for the CPU to callin.
*/
for (i = 0; i < 100000 && !cpu_callin_map[nr]; ++i) {
for (j = 1; j < 10000; j++)
asm volatile("nop" : : : "memory");
asm volatile("sync" : : : "memory");
}
if (!cpu_callin_map[nr])
goto stuck;
/* And we do the TB sync here too for standard dual CPU cards */
if (psurge_type == PSURGE_DUAL) {
while(!tb_req)
barrier();
tb_req = 0;
mb();
timebase = get_tb();
mb();
while (timebase)
barrier();
mb();
}
stuck:
/* now interrupt the secondary, restarting both TBs */
if (psurge_type == PSURGE_DUAL)
psurge_set_ipi(1);
if (ppc_md.progress) ppc_md.progress("smp_psurge_kick_cpu - done", 0x354);
return 0;
}
static struct irqaction psurge_irqaction = {
.handler = psurge_ipi_intr,
.flags = IRQF_PERCPU | IRQF_NO_THREAD,
.name = "primary IPI",
};
static void __init smp_psurge_setup_cpu(int cpu_nr)
{
if (cpu_nr != 0 || !psurge_start)
return;
/* reset the entry point so if we get another intr we won't
* try to startup again */
out_be32(psurge_start, 0x100);
if (setup_irq(irq_create_mapping(NULL, 30), &psurge_irqaction))
printk(KERN_ERR "Couldn't get primary IPI interrupt");
}
void __init smp_psurge_take_timebase(void)
{
if (psurge_type != PSURGE_DUAL)
return;
tb_req = 1;
mb();
while (!timebase)
barrier();
mb();
set_tb(timebase >> 32, timebase & 0xffffffff);
timebase = 0;
mb();
set_dec(tb_ticks_per_jiffy/2);
}
void __init smp_psurge_give_timebase(void)
{
/* Nothing to do here */
}
/* PowerSurge-style Macs */
struct smp_ops_t psurge_smp_ops = {
.message_pass = NULL, /* Use smp_muxed_ipi_message_pass */
.cause_ipi = smp_psurge_cause_ipi,
.probe = smp_psurge_probe,
.kick_cpu = smp_psurge_kick_cpu,
.setup_cpu = smp_psurge_setup_cpu,
.give_timebase = smp_psurge_give_timebase,
.take_timebase = smp_psurge_take_timebase,
};
#endif /* CONFIG_PPC_PMAC32_PSURGE */
/*
* Core 99 and later support
*/
static void smp_core99_give_timebase(void)
{
unsigned long flags;
local_irq_save(flags);
while(!tb_req)
barrier();
tb_req = 0;
(*pmac_tb_freeze)(1);
mb();
timebase = get_tb();
mb();
while (timebase)
barrier();
mb();
(*pmac_tb_freeze)(0);
mb();
local_irq_restore(flags);
}
static void __devinit smp_core99_take_timebase(void)
{
unsigned long flags;
local_irq_save(flags);
tb_req = 1;
mb();
while (!timebase)
barrier();
mb();
set_tb(timebase >> 32, timebase & 0xffffffff);
timebase = 0;
mb();
local_irq_restore(flags);
}
#ifdef CONFIG_PPC64
/*
* G5s enable/disable the timebase via an i2c-connected clock chip.
*/
static struct pmac_i2c_bus *pmac_tb_clock_chip_host;
static u8 pmac_tb_pulsar_addr;
static void smp_core99_cypress_tb_freeze(int freeze)
{
u8 data;
int rc;
/* Strangely, the device-tree says address is 0xd2, but darwin
* accesses 0xd0 ...
*/
pmac_i2c_setmode(pmac_tb_clock_chip_host,
pmac_i2c_mode_combined);
rc = pmac_i2c_xfer(pmac_tb_clock_chip_host,
0xd0 | pmac_i2c_read,
1, 0x81, &data, 1);
if (rc != 0)
goto bail;
data = (data & 0xf3) | (freeze ? 0x00 : 0x0c);
pmac_i2c_setmode(pmac_tb_clock_chip_host, pmac_i2c_mode_stdsub);
rc = pmac_i2c_xfer(pmac_tb_clock_chip_host,
0xd0 | pmac_i2c_write,
1, 0x81, &data, 1);
bail:
if (rc != 0) {
printk("Cypress Timebase %s rc: %d\n",
freeze ? "freeze" : "unfreeze", rc);
panic("Timebase freeze failed !\n");
}
}
static void smp_core99_pulsar_tb_freeze(int freeze)
{
u8 data;
int rc;
pmac_i2c_setmode(pmac_tb_clock_chip_host,
pmac_i2c_mode_combined);
rc = pmac_i2c_xfer(pmac_tb_clock_chip_host,
pmac_tb_pulsar_addr | pmac_i2c_read,
1, 0x2e, &data, 1);
if (rc != 0)
goto bail;
data = (data & 0x88) | (freeze ? 0x11 : 0x22);
pmac_i2c_setmode(pmac_tb_clock_chip_host, pmac_i2c_mode_stdsub);
rc = pmac_i2c_xfer(pmac_tb_clock_chip_host,
pmac_tb_pulsar_addr | pmac_i2c_write,
1, 0x2e, &data, 1);
bail:
if (rc != 0) {
printk(KERN_ERR "Pulsar Timebase %s rc: %d\n",
freeze ? "freeze" : "unfreeze", rc);
panic("Timebase freeze failed !\n");
}
}
static void __init smp_core99_setup_i2c_hwsync(int ncpus)
{
struct device_node *cc = NULL;
struct device_node *p;
const char *name = NULL;
const u32 *reg;
int ok;
/* Look for the clock chip */
while ((cc = of_find_node_by_name(cc, "i2c-hwclock")) != NULL) {
p = of_get_parent(cc);
ok = p && of_device_is_compatible(p, "uni-n-i2c");
of_node_put(p);
if (!ok)
continue;
pmac_tb_clock_chip_host = pmac_i2c_find_bus(cc);
if (pmac_tb_clock_chip_host == NULL)
continue;
reg = of_get_property(cc, "reg", NULL);
if (reg == NULL)
continue;
switch (*reg) {
case 0xd2:
if (of_device_is_compatible(cc,"pulsar-legacy-slewing")) {
pmac_tb_freeze = smp_core99_pulsar_tb_freeze;
pmac_tb_pulsar_addr = 0xd2;
name = "Pulsar";
} else if (of_device_is_compatible(cc, "cy28508")) {
pmac_tb_freeze = smp_core99_cypress_tb_freeze;
name = "Cypress";
}
break;
case 0xd4:
pmac_tb_freeze = smp_core99_pulsar_tb_freeze;
pmac_tb_pulsar_addr = 0xd4;
name = "Pulsar";
break;
}
if (pmac_tb_freeze != NULL)
break;
}
if (pmac_tb_freeze != NULL) {
/* Open i2c bus for synchronous access */
if (pmac_i2c_open(pmac_tb_clock_chip_host, 1)) {
printk(KERN_ERR "Failed top open i2c bus for clock"
" sync, fallback to software sync !\n");
goto no_i2c_sync;
}
printk(KERN_INFO "Processor timebase sync using %s i2c clock\n",
name);
return;
}
no_i2c_sync:
pmac_tb_freeze = NULL;
pmac_tb_clock_chip_host = NULL;
}
/*
* Newer G5s uses a platform function
*/
static void smp_core99_pfunc_tb_freeze(int freeze)
{
struct device_node *cpus;
struct pmf_args args;
cpus = of_find_node_by_path("/cpus");
BUG_ON(cpus == NULL);
args.count = 1;
args.u[0].v = !freeze;
pmf_call_function(cpus, "cpu-timebase", &args);
of_node_put(cpus);
}
#else /* CONFIG_PPC64 */
/*
* SMP G4 use a GPIO to enable/disable the timebase.
*/
static unsigned int core99_tb_gpio; /* Timebase freeze GPIO */
static void smp_core99_gpio_tb_freeze(int freeze)
{
if (freeze)
pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, core99_tb_gpio, 4);
else
pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, core99_tb_gpio, 0);
pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, core99_tb_gpio, 0);
}
#endif /* !CONFIG_PPC64 */
/* L2 and L3 cache settings to pass from CPU0 to CPU1 on G4 cpus */
volatile static long int core99_l2_cache;
volatile static long int core99_l3_cache;
static void __devinit core99_init_caches(int cpu)
{
#ifndef CONFIG_PPC64
if (!cpu_has_feature(CPU_FTR_L2CR))
return;
if (cpu == 0) {
core99_l2_cache = _get_L2CR();
printk("CPU0: L2CR is %lx\n", core99_l2_cache);
} else {
printk("CPU%d: L2CR was %lx\n", cpu, _get_L2CR());
_set_L2CR(0);
_set_L2CR(core99_l2_cache);
printk("CPU%d: L2CR set to %lx\n", cpu, core99_l2_cache);
}
if (!cpu_has_feature(CPU_FTR_L3CR))
return;
if (cpu == 0){
core99_l3_cache = _get_L3CR();
printk("CPU0: L3CR is %lx\n", core99_l3_cache);
} else {
printk("CPU%d: L3CR was %lx\n", cpu, _get_L3CR());
_set_L3CR(0);
_set_L3CR(core99_l3_cache);
printk("CPU%d: L3CR set to %lx\n", cpu, core99_l3_cache);
}
#endif /* !CONFIG_PPC64 */
}
static void __init smp_core99_setup(int ncpus)
{
#ifdef CONFIG_PPC64
/* i2c based HW sync on some G5s */
if (of_machine_is_compatible("PowerMac7,2") ||
of_machine_is_compatible("PowerMac7,3") ||
of_machine_is_compatible("RackMac3,1"))
smp_core99_setup_i2c_hwsync(ncpus);
/* pfunc based HW sync on recent G5s */
if (pmac_tb_freeze == NULL) {
struct device_node *cpus =
of_find_node_by_path("/cpus");
if (cpus &&
of_get_property(cpus, "platform-cpu-timebase", NULL)) {
pmac_tb_freeze = smp_core99_pfunc_tb_freeze;
printk(KERN_INFO "Processor timebase sync using"
" platform function\n");
}
}
#else /* CONFIG_PPC64 */
/* GPIO based HW sync on ppc32 Core99 */
if (pmac_tb_freeze == NULL && !of_machine_is_compatible("MacRISC4")) {
struct device_node *cpu;
const u32 *tbprop = NULL;
core99_tb_gpio = KL_GPIO_TB_ENABLE; /* default value */
cpu = of_find_node_by_type(NULL, "cpu");
if (cpu != NULL) {
tbprop = of_get_property(cpu, "timebase-enable", NULL);
if (tbprop)
core99_tb_gpio = *tbprop;
of_node_put(cpu);
}
pmac_tb_freeze = smp_core99_gpio_tb_freeze;
printk(KERN_INFO "Processor timebase sync using"
" GPIO 0x%02x\n", core99_tb_gpio);
}
#endif /* CONFIG_PPC64 */
/* No timebase sync, fallback to software */
if (pmac_tb_freeze == NULL) {
smp_ops->give_timebase = smp_generic_give_timebase;
smp_ops->take_timebase = smp_generic_take_timebase;
printk(KERN_INFO "Processor timebase sync using software\n");
}
#ifndef CONFIG_PPC64
{
int i;
/* XXX should get this from reg properties */
for (i = 1; i < ncpus; ++i)
set_hard_smp_processor_id(i, i);
}
#endif
/* 32 bits SMP can't NAP */
if (!of_machine_is_compatible("MacRISC4"))
powersave_nap = 0;
}
static int __init smp_core99_probe(void)
{
struct device_node *cpus;
int ncpus = 0;
if (ppc_md.progress) ppc_md.progress("smp_core99_probe", 0x345);
/* Count CPUs in the device-tree */
for (cpus = NULL; (cpus = of_find_node_by_type(cpus, "cpu")) != NULL;)
++ncpus;
printk(KERN_INFO "PowerMac SMP probe found %d cpus\n", ncpus);
/* Nothing more to do if less than 2 of them */
if (ncpus <= 1)
return 1;
/* We need to perform some early initialisations before we can start
* setting up SMP as we are running before initcalls
*/
pmac_pfunc_base_install();
pmac_i2c_init();
/* Setup various bits like timebase sync method, ability to nap, ... */
smp_core99_setup(ncpus);
/* Install IPIs */
mpic_request_ipis();
/* Collect l2cr and l3cr values from CPU 0 */
core99_init_caches(0);
return ncpus;
}
static int __devinit smp_core99_kick_cpu(int nr)
{
unsigned int save_vector;
unsigned long target, flags;
unsigned int *vector = (unsigned int *)(PAGE_OFFSET+0x100);
if (nr < 0 || nr > 3)
return -ENOENT;
if (ppc_md.progress)
ppc_md.progress("smp_core99_kick_cpu", 0x346);
local_irq_save(flags);
/* Save reset vector */
save_vector = *vector;
/* Setup fake reset vector that does
* b __secondary_start_pmac_0 + nr*8
*/
target = (unsigned long) __secondary_start_pmac_0 + nr * 8;
patch_branch(vector, target, BRANCH_SET_LINK);
/* Put some life in our friend */
pmac_call_feature(PMAC_FTR_RESET_CPU, NULL, nr, 0);
/* FIXME: We wait a bit for the CPU to take the exception, I should
* instead wait for the entry code to set something for me. Well,
* ideally, all that crap will be done in prom.c and the CPU left
* in a RAM-based wait loop like CHRP.
*/
mdelay(1);
/* Restore our exception vector */
*vector = save_vector;
flush_icache_range((unsigned long) vector, (unsigned long) vector + 4);
local_irq_restore(flags);
if (ppc_md.progress) ppc_md.progress("smp_core99_kick_cpu done", 0x347);
return 0;
}
static void __devinit smp_core99_setup_cpu(int cpu_nr)
{
/* Setup L2/L3 */
if (cpu_nr != 0)
core99_init_caches(cpu_nr);
/* Setup openpic */
mpic_setup_this_cpu();
}
#ifdef CONFIG_PPC64
#ifdef CONFIG_HOTPLUG_CPU
static int smp_core99_cpu_notify(struct notifier_block *self,
unsigned long action, void *hcpu)
{
int rc;
switch(action) {
case CPU_UP_PREPARE:
case CPU_UP_PREPARE_FROZEN:
/* Open i2c bus if it was used for tb sync */
if (pmac_tb_clock_chip_host) {
rc = pmac_i2c_open(pmac_tb_clock_chip_host, 1);
if (rc) {
pr_err("Failed to open i2c bus for time sync\n");
return notifier_from_errno(rc);
}
}
break;
case CPU_ONLINE:
case CPU_UP_CANCELED:
/* Close i2c bus if it was used for tb sync */
if (pmac_tb_clock_chip_host)
pmac_i2c_close(pmac_tb_clock_chip_host);
break;
default:
break;
}
return NOTIFY_OK;
}
static struct notifier_block __cpuinitdata smp_core99_cpu_nb = {
.notifier_call = smp_core99_cpu_notify,
};
#endif /* CONFIG_HOTPLUG_CPU */
static void __init smp_core99_bringup_done(void)
{
extern void g5_phy_disable_cpu1(void);
/* Close i2c bus if it was used for tb sync */
if (pmac_tb_clock_chip_host)
pmac_i2c_close(pmac_tb_clock_chip_host);
/* If we didn't start the second CPU, we must take
* it off the bus.
*/
if (of_machine_is_compatible("MacRISC4") &&
num_online_cpus() < 2) {
set_cpu_present(1, false);
g5_phy_disable_cpu1();
}
#ifdef CONFIG_HOTPLUG_CPU
register_cpu_notifier(&smp_core99_cpu_nb);
#endif
if (ppc_md.progress)
ppc_md.progress("smp_core99_bringup_done", 0x349);
}
#endif /* CONFIG_PPC64 */
#ifdef CONFIG_HOTPLUG_CPU
static int smp_core99_cpu_disable(void)
{
int rc = generic_cpu_disable();
if (rc)
return rc;
mpic_cpu_set_priority(0xf);
return 0;
}
#ifdef CONFIG_PPC32
static void pmac_cpu_die(void)
{
int cpu = smp_processor_id();
local_irq_disable();
idle_task_exit();
pr_debug("CPU%d offline\n", cpu);
generic_set_cpu_dead(cpu);
smp_wmb();
mb();
low_cpu_die();
}
#else /* CONFIG_PPC32 */
static void pmac_cpu_die(void)
{
int cpu = smp_processor_id();
local_irq_disable();
idle_task_exit();
/*
* turn off as much as possible, we'll be
* kicked out as this will only be invoked
* on core99 platforms for now ...
*/
printk(KERN_INFO "CPU#%d offline\n", cpu);
generic_set_cpu_dead(cpu);
smp_wmb();
/*
* Re-enable interrupts. The NAP code needs to enable them
* anyways, do it now so we deal with the case where one already
* happened while soft-disabled.
* We shouldn't get any external interrupts, only decrementer, and the
* decrementer handler is safe for use on offline CPUs
*/
local_irq_enable();
while (1) {
/* let's not take timer interrupts too often ... */
set_dec(0x7fffffff);
/* Enter NAP mode */
power4_idle();
}
}
#endif /* else CONFIG_PPC32 */
#endif /* CONFIG_HOTPLUG_CPU */
/* Core99 Macs (dual G4s and G5s) */
struct smp_ops_t core99_smp_ops = {
.message_pass = smp_mpic_message_pass,
.probe = smp_core99_probe,
#ifdef CONFIG_PPC64
.bringup_done = smp_core99_bringup_done,
#endif
.kick_cpu = smp_core99_kick_cpu,
.setup_cpu = smp_core99_setup_cpu,
.give_timebase = smp_core99_give_timebase,
.take_timebase = smp_core99_take_timebase,
#if defined(CONFIG_HOTPLUG_CPU)
.cpu_disable = smp_core99_cpu_disable,
.cpu_die = generic_cpu_die,
#endif
};
void __init pmac_setup_smp(void)
{
struct device_node *np;
/* Check for Core99 */
np = of_find_node_by_name(NULL, "uni-n");
if (!np)
np = of_find_node_by_name(NULL, "u3");
if (!np)
np = of_find_node_by_name(NULL, "u4");
if (np) {
of_node_put(np);
smp_ops = &core99_smp_ops;
}
#ifdef CONFIG_PPC_PMAC32_PSURGE
else {
/* We have to set bits in cpu_possible_mask here since the
* secondary CPU(s) aren't in the device tree. Various
* things won't be initialized for CPUs not in the possible
* map, so we really need to fix it up here.
*/
int cpu;
for (cpu = 1; cpu < 4 && cpu < NR_CPUS; ++cpu)
set_cpu_possible(cpu, true);
smp_ops = &psurge_smp_ops;
}
#endif /* CONFIG_PPC_PMAC32_PSURGE */
#ifdef CONFIG_HOTPLUG_CPU
ppc_md.cpu_die = pmac_cpu_die;
#endif
}
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