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/*
* (C) Copyright 2000-2002
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* (C) Copyright 2003
* Gleb Natapov <gnatapov@mrv.com>
*
* (C) Copyright 2007
* Daniel Hellstrom, Gaisler Research, daniel@gaisler.com.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <asm/processor.h>
#include <asm/irq.h>
/* Implemented by SPARC CPUs */
extern int interrupt_init_cpu(void);
extern void timer_interrupt_cpu(void *arg);
extern int timer_interrupt_init_cpu(void);
int intLock(void)
{
unsigned int pil;
pil = get_pil();
/* set PIL to 15 ==> no pending interrupts will interrupt CPU */
set_pil(15);
return pil;
}
void intUnlock(int oldLevel)
{
set_pil(oldLevel);
}
void enable_interrupts(void)
{
set_pil(0); /* enable all interrupts */
}
int disable_interrupts(void)
{
return intLock();
}
int interrupt_init(void)
{
int ret;
/* call cpu specific function from $(CPU)/interrupts.c */
ret = interrupt_init_cpu();
/* enable global interrupts */
enable_interrupts();
return ret;
}
/* timer interrupt/overflow counter */
static volatile ulong timestamp = 0;
/* regs can not be used here! regs is actually the pointer given in
* irq_install_handler
*/
void timer_interrupt(struct pt_regs *regs)
{
/* call cpu specific function from $(CPU)/interrupts.c */
timer_interrupt_cpu((void *)regs);
timestamp++;
}
void reset_timer(void)
{
timestamp = 0;
}
ulong get_timer(ulong base)
{
return (timestamp - base);
}
void set_timer(ulong t)
{
timestamp = t;
}
void timer_interrupt_init(void)
{
int irq;
reset_timer();
irq = timer_interrupt_init_cpu();
if (irq < 0) {
/* cpu specific code handled the interrupt registration it self */
return;
}
/* register interrupt handler for timer */
irq_install_handler(irq, (void (*)(void *))timer_interrupt, NULL);
}