You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
99 lines
2.1 KiB
99 lines
2.1 KiB
20 years ago
|
/*
|
||
|
|
* Smp support for CHRP machines.
|
||
|
|
*
|
||
|
|
* Written by Cort Dougan (cort@cs.nmt.edu) borrowing a great
|
||
|
|
* deal of code from the sparc and intel versions.
|
||
|
|
*
|
||
|
|
* Copyright (C) 1999 Cort Dougan <cort@cs.nmt.edu>
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/config.h>
|
||
|
|
#include <linux/kernel.h>
|
||
|
|
#include <linux/sched.h>
|
||
|
|
#include <linux/smp.h>
|
||
|
|
#include <linux/smp_lock.h>
|
||
|
|
#include <linux/interrupt.h>
|
||
|
|
#include <linux/kernel_stat.h>
|
||
|
|
#include <linux/delay.h>
|
||
|
|
#include <linux/init.h>
|
||
|
|
#include <linux/spinlock.h>
|
||
|
|
|
||
|
|
#include <asm/ptrace.h>
|
||
|
|
#include <asm/atomic.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/residual.h>
|
||
|
|
#include <asm/time.h>
|
||
|
|
#include <asm/open_pic.h>
|
||
|
|
|
||
|
|
extern unsigned long smp_chrp_cpu_nr;
|
||
|
|
|
||
|
|
static int __init
|
||
|
|
smp_chrp_probe(void)
|
||
|
|
{
|
||
|
|
if (smp_chrp_cpu_nr > 1)
|
||
|
|
openpic_request_IPIs();
|
||
|
|
|
||
|
|
return smp_chrp_cpu_nr;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void __devinit
|
||
|
|
smp_chrp_kick_cpu(int nr)
|
||
|
|
{
|
||
|
|
*(unsigned long *)KERNELBASE = nr;
|
||
|
|
asm volatile("dcbf 0,%0"::"r"(KERNELBASE):"memory");
|
||
|
|
}
|
||
|
|
|
||
|
|
static void __devinit
|
||
|
|
smp_chrp_setup_cpu(int cpu_nr)
|
||
|
|
{
|
||
|
|
if (OpenPIC_Addr)
|
||
|
|
do_openpic_setup_cpu();
|
||
|
|
}
|
||
|
|
|
||
|
|
static DEFINE_SPINLOCK(timebase_lock);
|
||
|
|
static unsigned int timebase_upper = 0, timebase_lower = 0;
|
||
|
|
|
||
|
|
void __devinit
|
||
|
|
smp_chrp_give_timebase(void)
|
||
|
|
{
|
||
|
|
spin_lock(&timebase_lock);
|
||
|
|
call_rtas("freeze-time-base", 0, 1, NULL);
|
||
|
|
timebase_upper = get_tbu();
|
||
|
|
timebase_lower = get_tbl();
|
||
|
|
spin_unlock(&timebase_lock);
|
||
|
|
|
||
|
|
while (timebase_upper || timebase_lower)
|
||
|
|
barrier();
|
||
|
|
call_rtas("thaw-time-base", 0, 1, NULL);
|
||
|
|
}
|
||
|
|
|
||
|
|
void __devinit
|
||
|
|
smp_chrp_take_timebase(void)
|
||
|
|
{
|
||
|
|
while (!(timebase_upper || timebase_lower))
|
||
|
|
barrier();
|
||
|
|
spin_lock(&timebase_lock);
|
||
|
|
set_tb(timebase_upper, timebase_lower);
|
||
|
|
timebase_upper = 0;
|
||
|
|
timebase_lower = 0;
|
||
|
|
spin_unlock(&timebase_lock);
|
||
|
|
printk("CPU %i taken timebase\n", smp_processor_id());
|
||
|
|
}
|
||
|
|
|
||
|
|
/* CHRP with openpic */
|
||
|
|
struct smp_ops_t chrp_smp_ops __chrpdata = {
|
||
|
|
.message_pass = smp_openpic_message_pass,
|
||
|
|
.probe = smp_chrp_probe,
|
||
|
|
.kick_cpu = smp_chrp_kick_cpu,
|
||
|
|
.setup_cpu = smp_chrp_setup_cpu,
|
||
|
|
.give_timebase = smp_chrp_give_timebase,
|
||
|
|
.take_timebase = smp_chrp_take_timebase,
|
||
|
|
};
|