interrupts.c
3.06 KB
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/*
* (C) Copyright 2000-2002
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* (C) Copyright 2003
* Gleb Natapov <gnatapov@mrv.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 <watchdog.h>
#ifdef CONFIG_STATUS_LED
#include <status_led.h>
#endif
#ifdef CONFIG_SHOW_ACTIVITY
extern void board_show_activity (ulong);
#endif /* CONFIG_SHOW_ACTIVITY */
#ifndef CFG_WATCHDOG_FREQ
#define CFG_WATCHDOG_FREQ (CFG_HZ / 2)
#endif
extern int interrupt_init_cpu (unsigned *);
extern void timer_interrupt_cpu (struct pt_regs *);
static unsigned decrementer_count; /* count value for 1e6/HZ microseconds */
static __inline__ unsigned long get_msr (void)
{
unsigned long msr;
asm volatile ("mfmsr %0":"=r" (msr):);
return msr;
}
static __inline__ void set_msr (unsigned long msr)
{
asm volatile ("mtmsr %0"::"r" (msr));
}
static __inline__ unsigned long get_dec (void)
{
unsigned long val;
asm volatile ("mfdec %0":"=r" (val):);
return val;
}
static __inline__ void set_dec (unsigned long val)
{
if (val)
asm volatile ("mtdec %0"::"r" (val));
}
void enable_interrupts (void)
{
set_msr (get_msr () | MSR_EE);
}
/* returns flag if MSR_EE was set before */
int disable_interrupts (void)
{
ulong msr = get_msr ();
set_msr (msr & ~MSR_EE);
return ((msr & MSR_EE) != 0);
}
int interrupt_init (void)
{
int ret;
/* call cpu specific function from $(CPU)/interrupts.c */
ret = interrupt_init_cpu (&decrementer_count);
if (ret)
return ret;
set_dec (decrementer_count);
set_msr (get_msr () | MSR_EE);
return (0);
}
static volatile ulong timestamp = 0;
void timer_interrupt (struct pt_regs *regs)
{
/* call cpu specific function from $(CPU)/interrupts.c */
timer_interrupt_cpu (regs);
/* Restore Decrementer Count */
set_dec (decrementer_count);
timestamp++;
#if defined(CONFIG_WATCHDOG) || defined (CONFIG_HW_WATCHDOG)
if ((timestamp % (CFG_WATCHDOG_FREQ)) == 0)
WATCHDOG_RESET ();
#endif /* CONFIG_WATCHDOG || CONFIG_HW_WATCHDOG */
#ifdef CONFIG_STATUS_LED
status_led_tick (timestamp);
#endif /* CONFIG_STATUS_LED */
#ifdef CONFIG_SHOW_ACTIVITY
board_show_activity (timestamp);
#endif /* CONFIG_SHOW_ACTIVITY */
}
void reset_timer (void)
{
timestamp = 0;
}
ulong get_timer (ulong base)
{
return (timestamp - base);
}
void set_timer (ulong t)
{
timestamp = t;
}