mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-27 07:01:24 +00:00
6d0943a6be
Move duplicated exception handling code into lib_arm. Signed-off-by: Andreas Engel <andreas.engel@ericsson.com>
125 lines
2.9 KiB
C
125 lines
2.9 KiB
C
/*
|
|
* (C) Copyright 2006
|
|
* Stefan Roese, DENX Software Engineering, sr@denx.de.
|
|
*
|
|
* (C) Copyright 2002
|
|
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
|
|
* Marius Groeger <mgroeger@sysgo.de>
|
|
*
|
|
* (C) Copyright 2002
|
|
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
|
|
* Alex Zuepke <azu@sysgo.de>
|
|
*
|
|
* 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/arch/ixp425.h>
|
|
|
|
#ifdef CONFIG_USE_IRQ
|
|
#include <asm/proc-armv/ptrace.h>
|
|
|
|
/*
|
|
* When interrupts are enabled, use timer 2 for time/delay generation...
|
|
*/
|
|
|
|
#define FREQ 66666666
|
|
#define CLOCK_TICK_RATE (((FREQ / CFG_HZ & ~IXP425_OST_RELOAD_MASK) + 1) * CFG_HZ)
|
|
#define LATCH ((CLOCK_TICK_RATE + CFG_HZ/2) / CFG_HZ) /* For divider */
|
|
|
|
struct _irq_handler {
|
|
void *m_data;
|
|
void (*m_func)( void *data);
|
|
};
|
|
|
|
static struct _irq_handler IRQ_HANDLER[N_IRQS];
|
|
|
|
static volatile ulong timestamp;
|
|
|
|
static void default_isr(void *data)
|
|
{
|
|
printf("default_isr(): called for IRQ %d, Interrupt Status=%x PR=%x\n",
|
|
(int)data, *IXP425_ICIP, *IXP425_ICIH);
|
|
}
|
|
|
|
static int next_irq(void)
|
|
{
|
|
return (((*IXP425_ICIH & 0x000000fc) >> 2) - 1);
|
|
}
|
|
|
|
static void timer_isr(void *data)
|
|
{
|
|
unsigned int *pTime = (unsigned int *)data;
|
|
|
|
(*pTime)++;
|
|
|
|
/*
|
|
* Reset IRQ source
|
|
*/
|
|
*IXP425_OSST = IXP425_OSST_TIMER_2_PEND;
|
|
}
|
|
|
|
ulong get_timer (ulong base)
|
|
{
|
|
return timestamp - base;
|
|
}
|
|
|
|
void reset_timer (void)
|
|
{
|
|
timestamp = 0;
|
|
}
|
|
|
|
#endif /* #ifdef CONFIG_USE_IRQ */
|
|
|
|
#ifdef CONFIG_USE_IRQ
|
|
void do_irq (struct pt_regs *pt_regs)
|
|
{
|
|
int irq = next_irq();
|
|
|
|
IRQ_HANDLER[irq].m_func(IRQ_HANDLER[irq].m_data);
|
|
}
|
|
#endif
|
|
|
|
int interrupt_init (void)
|
|
{
|
|
#ifdef CONFIG_USE_IRQ
|
|
int i;
|
|
|
|
/* install default interrupt handlers */
|
|
for (i = 0; i < N_IRQS; i++) {
|
|
IRQ_HANDLER[i].m_data = (void *)i;
|
|
IRQ_HANDLER[i].m_func = default_isr;
|
|
}
|
|
|
|
/* install interrupt handler for timer */
|
|
IRQ_HANDLER[IXP425_TIMER_2_IRQ].m_data = (void *)×tamp;
|
|
IRQ_HANDLER[IXP425_TIMER_2_IRQ].m_func = timer_isr;
|
|
|
|
/* setup the Timer counter value */
|
|
*IXP425_OSRT2 = (LATCH & ~IXP425_OST_RELOAD_MASK) | IXP425_OST_ENABLE;
|
|
|
|
/* configure interrupts for IRQ mode */
|
|
*IXP425_ICLR = 0x00000000;
|
|
|
|
/* enable timer irq */
|
|
*IXP425_ICMR = (1 << IXP425_TIMER_2_IRQ);
|
|
#endif
|
|
|
|
return (0);
|
|
}
|