panic.c

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/*
 * Copyright (C) 2003  Richard Curnow, SuperH UK Limited
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */

#include <linux/kernel.h>
#include <linux/io.h>
#include <cpu/registers.h>

/* THIS IS A PHYSICAL ADDRESS */
#define HDSP2534_ADDR (0x04002100)

static void poor_mans_delay(void)
{
    int i;

    for (i = 0; i < 2500000; i++)
        cpu_relax();
}

static void show_value(unsigned long x)
{
    int i;
    unsigned nibble;
    for (i = 0; i < 8; i++) {
        nibble = ((x >> (i * 4)) & 0xf);

        __raw_writeb(nibble + ((nibble > 9) ? 55 : 48),
              HDSP2534_ADDR + 0xe0 + ((7 - i) << 2));
    }
}

void
panic_handler(unsigned long panicPC, unsigned long panicSSR,
          unsigned long panicEXPEVT)
{
    while (1) {
        /* This piece of code displays the PC on the LED display */
        show_value(panicPC);
        poor_mans_delay();
        show_value(panicSSR);
        poor_mans_delay();
        show_value(panicEXPEVT);
        poor_mans_delay();
    }
}