interrupts.c

ZooBoot-4510

/*
 * (C) Copyright 2002
 * Lineo, Inc. <www.lineo.com>
 * Bernhard Kuhn <[e-mail]>
 *
 * (C) Copyright 2002
 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
 * Marius Groeger <[e-mail]>
 *
 * (C) Copyright 2002
 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
 * Alex Zuepke <[e-mail]>
 *
 * (C) Copyright 2003
 * C&M Technology <www.cmtekchina.com>
 * Meter Chen <[e-mail]>
 *
 * 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 <zooboot.h>
#include <hardware.h>
#include <ptregs.h>

/******************************************/
/****    Exception Handler Function    ****/
/******************************************/
void ISR_UndefHandler(REG32 *adr)
{
	while(1);
}

void ISR_PrefetchHandler(REG32 *adr)
{
	while(1);
}

void ISR_AbortHandler(REG32 *adr)
{
	while(1);
}

void ISR_SwiHandler(void)
{
	while(1);
}

void ISR_IrqHandler(void)
{
	while(1);
}

void ISR_FiqHandler(void)
{
	while(1);
}


/*******************************************************/
/*                                                     */
/*                   Timer function                    */
/*                                                     */
/*******************************************************/

extern void reset_cpu(ulong addr);

/* we always count down the max. */
#define TIMER_LOAD_VAL 0xffffffff

/* macro to read the 32 bit timer */
#define READ_TIMER (0xffffffff - tmr->tcnt0)
timer_t* tmr;

void enable_interrupts (void)
{
    return;
}

int disable_interrupts (void)
{
    return 0;
}


void bad_mode(void)
{
    panic("Resetting CPU ...\n");
    reset_cpu(0);
}

void show_regs(struct pt_regs * regs)
{

}

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);
    bad_mode();
}

void do_irq(struct pt_regs *pt_regs)
{
    printf("interrupt request\n");
    show_regs(pt_regs);
    bad_mode();
}

static ulong timestamp;
static ulong lastinc;

void timer_init(void)
{
    tmr = (timer_t*) TIMER_BASE;
    tmr->tdata0=TIMER_LOAD_VAL;

    lastinc=0;

    tmr->tmod=1;
    timestamp = 0;
}

extern void interrupt_init (bd_t *bd)
{
    timer_init();
}

/*
 * timer without interrupts
 */

void reset_timer(void)
{
    reset_timer_masked();
}

ulong get_timer (ulong base)
{
    return get_timer_masked() - base;
}

void set_timer (ulong t)
{
    timestamp = t;
}

void udelay(unsigned long usec)
{
    udelay_masked(usec);
}

void reset_timer_masked(void)
{
    /* reset time */
    lastinc = READ_TIMER;
    timestamp = 0;
}

ulong get_timer_masked(void)
{
    ulong now = READ_TIMER;
    if (now >= lastinc)
    {
        /* normal mode */
        timestamp += now - lastinc;
    } else {
        /* we have an overflow ... */
        timestamp += now + TIMER_LOAD_VAL - lastinc;
    }
    lastinc = now;

    return timestamp;
}

void udelay_masked(unsigned long usec)
{
    ulong tmo;

    tmo = usec / 1000;
    tmo *= CFG_HZ;
    tmo /= 1000;

    reset_timer_masked();

    while(get_timer_masked() < tmo);
      /*NOP*/;
}

void reset_cpu(ulong addr)
{
#if 1
	/* soft reset */
	((void (*)(void))addr)();
#else
	/* use watchdog timeout */
	printf("reset...");
	//tmr->wdcon = 0xffff00;
	//tmr->wdcon |= 0x1;
	while(1);
#endif
}