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/* tick14.c
* linux/arch/sparc/kernel/tick14.c
*
* Copyright (C) 1996 David Redman (djhr@tadpole.co.uk)
*
* This file handles the Sparc specific level14 ticker
* This is really useful for profiling OBP uses it for keyboard
* aborts and other stuff.
*
*
*/
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/param.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/timex.h>
#include <linux/interrupt.h>
#include <asm/oplib.h>
#include <asm/segment.h>
#include <asm/timer.h>
#include <asm/mostek.h>
#include <asm/system.h>
#include <asm/irq.h>
#include <asm/io.h>
extern unsigned long lvl14_save[5];
static unsigned long *linux_lvl14 = NULL;
static unsigned long obp_lvl14[4];
/*
* Call with timer IRQ closed.
* First time we do it with disable_irq, later prom code uses spin_lock_irq().
*/
void install_linux_ticker(void)
{
if (!linux_lvl14)
return;
linux_lvl14[0] = lvl14_save[0];
linux_lvl14[1] = lvl14_save[1];
linux_lvl14[2] = lvl14_save[2];
linux_lvl14[3] = lvl14_save[3];
}
void install_obp_ticker(void)
{
if (!linux_lvl14)
return;
linux_lvl14[0] = obp_lvl14[0];
linux_lvl14[1] = obp_lvl14[1];
linux_lvl14[2] = obp_lvl14[2];
linux_lvl14[3] = obp_lvl14[3];
}
void claim_ticker14(irqreturn_t (*handler)(int, void *, struct pt_regs *),
int irq_nr, unsigned int timeout )
{
int cpu = smp_processor_id();
/* first we copy the obp handler instructions
*/
disable_irq(irq_nr);
if (!handler)
return;
linux_lvl14 = (unsigned long *)lvl14_save[4];
obp_lvl14[0] = linux_lvl14[0];
obp_lvl14[1] = linux_lvl14[1];
obp_lvl14[2] = linux_lvl14[2];
obp_lvl14[3] = linux_lvl14[3];
if (!request_irq(irq_nr,
handler,
(SA_INTERRUPT | SA_STATIC_ALLOC),
"counter14",
NULL)) {
install_linux_ticker();
load_profile_irq(cpu, timeout);
enable_irq(irq_nr);
}
}
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