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/*
* (C) Copyright 2000-2002
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
* Rob Taylor, Flying Pig Systems. robt@flyingpig.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 <mpc824x.h>
#include <asm/processor.h>
#include <asm/pci_io.h>
#include <commproc.h>
#include <watchdog.h>
#include "drivers/epic.h"
/****************************************************************************/
unsigned decrementer_count; /* count val 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)
{
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)
{
decrementer_count = (get_bus_freq (0) / 4) / CFG_HZ;
/*
* It's all broken at the moment and I currently don't need
* interrupts. If you want to fix it, have a look at the epic
* drivers in dink32 v12. They do everthing and Motorola said
* I could use the dink source in this project as long as
* copyright notices remain intact.
*/
epicInit (EPIC_DIRECT_IRQ, 0);
/* EPIC won't generate INT unless Current Task Pri < 15 */
epicCurTaskPrioSet(0);
set_dec (decrementer_count);
set_msr (get_msr () | MSR_EE);
return (0);
}
/****************************************************************************/
/*
* Handle external interrupts
*/
void external_interrupt (struct pt_regs *regs)
{
register unsigned long temp;
pci_readl (CFG_EUMB_ADDR + EPIC_PROC_INT_ACK_REG, temp);
sync (); /* i'm not convinced this is needed, but dink source has it */
temp &= 0xff; /*get vector */
/*TODO: handle them -... */
epicEOI ();
}
/****************************************************************************/
/*
* blank int handlers.
*/
void
irq_install_handler (int vec, interrupt_handler_t * handler, void *arg)
{
}
void irq_free_handler (int vec)
{
}
/*TODO: some handlers for winbond and 87308 interrupts
and what about generic pci inteerupts?
vga?
*/
volatile ulong timestamp = 0;
void timer_interrupt (struct pt_regs *regs)
{
/* Restore Decrementer Count */
set_dec (decrementer_count);
timestamp++;
#if defined(CONFIG_WATCHDOG) || defined (CONFIG_HW_WATCHDOG)
if ((timestamp % (CFG_HZ / 2)) == 0) {
WATCHDOG_RESET ();
}
#endif /* CONFIG_WATCHDOG */
#if defined(CONFIG_SHOW_ACTIVITY) && defined(CONFIG_OXC)
if ((timestamp % (CFG_HZ / 10)) == 0) {
{
extern void oxc_toggle_activeled (void);
oxc_toggle_activeled ();
}
}
#endif
}
void reset_timer (void)
{
timestamp = 0;
}
ulong get_timer (ulong base)
{
return (timestamp - base);
}
void set_timer (ulong t)
{
timestamp = t;
}
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