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/*
* (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
/*
* 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;
/* enable IRQ/FIQ interrupts */
void enable_interrupts(void)
{
unsigned long temp;
__asm__ __volatile__("mrs %0, cpsr\n"
"bic %0, %0, #0x80\n"
"msr cpsr_c, %0"
: "=r" (temp)
:
: "memory");
}
/*
* disable IRQ/FIQ interrupts
* returns true if interrupts had been enabled before we disabled them
*/
int disable_interrupts(void)
{
unsigned long old,temp;
__asm__ __volatile__("mrs %0, cpsr\n"
"orr %1, %0, #0x80\n"
"msr cpsr_c, %1"
: "=r" (old), "=r" (temp)
:
: "memory");
return (old & 0x80) == 0;
}
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;
}
#else /* #ifdef CONFIG_USE_IRQ */
void enable_interrupts (void)
{
return;
}
int disable_interrupts (void)
{
return 0;
}
#endif /* #ifdef CONFIG_USE_IRQ */
void bad_mode (void)
{
panic ("Resetting CPU ...\n");
reset_cpu (0);
}
void show_regs (struct pt_regs *regs)
{
unsigned long flags;
const char *processor_modes[] = {
"USER_26", "FIQ_26", "IRQ_26", "SVC_26",
"UK4_26", "UK5_26", "UK6_26", "UK7_26",
"UK8_26", "UK9_26", "UK10_26", "UK11_26",
"UK12_26", "UK13_26", "UK14_26", "UK15_26",
"USER_32", "FIQ_32", "IRQ_32", "SVC_32",
"UK4_32", "UK5_32", "UK6_32", "ABT_32",
"UK8_32", "UK9_32", "UK10_32", "UND_32",
"UK12_32", "UK13_32", "UK14_32", "SYS_32"
};
flags = condition_codes (regs);
printf ("pc : [<%08lx>] lr : [<%08lx>]\n"
"sp : %08lx ip : %08lx fp : %08lx\n",
instruction_pointer (regs),
regs->ARM_lr, regs->ARM_sp, regs->ARM_ip, regs->ARM_fp);
printf ("r10: %08lx r9 : %08lx r8 : %08lx\n",
regs->ARM_r10, regs->ARM_r9, regs->ARM_r8);
printf ("r7 : %08lx r6 : %08lx r5 : %08lx r4 : %08lx\n",
regs->ARM_r7, regs->ARM_r6, regs->ARM_r5, regs->ARM_r4);
printf ("r3 : %08lx r2 : %08lx r1 : %08lx r0 : %08lx\n",
regs->ARM_r3, regs->ARM_r2, regs->ARM_r1, regs->ARM_r0);
printf ("Flags: %c%c%c%c",
flags & CC_N_BIT ? 'N' : 'n',
flags & CC_Z_BIT ? 'Z' : 'z',
flags & CC_C_BIT ? 'C' : 'c', flags & CC_V_BIT ? 'V' : 'v');
printf (" IRQs %s FIQs %s Mode %s%s\n",
interrupts_enabled (regs) ? "on" : "off",
fast_interrupts_enabled (regs) ? "on" : "off",
processor_modes[processor_mode (regs)],
thumb_mode (regs) ? " (T)" : "");
}
void do_undefined_instruction (struct pt_regs *pt_regs)
{
printf ("undefined instruction\n");
show_regs (pt_regs);
bad_mode ();
}
void do_software_interrupt (struct pt_regs *pt_regs)
{
printf ("software interrupt\n");
show_regs (pt_regs);
bad_mode ();
}
void do_prefetch_abort (struct pt_regs *pt_regs)
{
printf ("prefetch abort\n");
show_regs (pt_regs);
bad_mode ();
}
void do_data_abort (struct pt_regs *pt_regs)
{
printf ("data abort\n");
show_regs (pt_regs);
bad_mode ();
}
void do_not_used (struct pt_regs *pt_regs)
{
printf ("not used\n");
show_regs (pt_regs);
bad_mode ();
}
void do_fiq (struct pt_regs *pt_regs)
{
printf ("fast interrupt request\n");
show_regs (pt_regs);
printf("IRQ=%08lx FIQ=%08lx\n", *IXP425_ICIH, *IXP425_ICFH);
}
void do_irq (struct pt_regs *pt_regs)
{
#ifdef CONFIG_USE_IRQ
int irq = next_irq();
IRQ_HANDLER[irq].m_func(IRQ_HANDLER[irq].m_data);
#else
printf ("interrupt request\n");
show_regs (pt_regs);
bad_mode ();
#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);
}
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