2005-10-26 19:45:56 +08:00
|
|
|
/*
|
|
|
|
* 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/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 <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/machdep.h>
|
2005-10-27 20:42:04 +08:00
|
|
|
#include <asm/smp.h>
|
|
|
|
#include <asm/mpic.h>
|
2005-11-18 12:54:12 +08:00
|
|
|
#include <asm/rtas.h>
|
2005-10-26 19:45:56 +08:00
|
|
|
|
|
|
|
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)
|
|
|
|
{
|
2005-10-27 20:42:04 +08:00
|
|
|
mpic_setup_this_cpu();
|
2005-10-26 19:45:56 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
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);
|
|
|
|
rtas_call(rtas_token("freeze-time-base"), 0, 1, NULL);
|
|
|
|
timebase_upper = get_tbu();
|
|
|
|
timebase_lower = get_tbl();
|
|
|
|
spin_unlock(&timebase_lock);
|
|
|
|
|
|
|
|
while (timebase_upper || timebase_lower)
|
|
|
|
barrier();
|
|
|
|
rtas_call(rtas_token("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 = {
|
2005-10-27 20:42:04 +08:00
|
|
|
.message_pass = smp_mpic_message_pass,
|
2005-11-05 07:33:55 +08:00
|
|
|
.probe = smp_mpic_probe,
|
2005-10-26 19:45:56 +08:00
|
|
|
.kick_cpu = smp_chrp_kick_cpu,
|
|
|
|
.setup_cpu = smp_chrp_setup_cpu,
|
|
|
|
.give_timebase = smp_chrp_give_timebase,
|
|
|
|
.take_timebase = smp_chrp_take_timebase,
|
|
|
|
};
|