arch/sh/boards/mach-cayman/panic.c

   1 /*
   2  * Copyright (C) 2003  Richard Curnow, SuperH UK Limited
   3  *
   4  * This file is subject to the terms and conditions of the GNU General Public
   5  * License.  See the file "COPYING" in the main directory of this archive
   6  * for more details.
   7  */
   8
   9 #include <linux/kernel.h>
  10 #include <linux/io.h>
  11 #include <cpu/registers.h>
  12
  13 /* THIS IS A PHYSICAL ADDRESS */
  14 #define HDSP2534_ADDR (0x04002100)
  15
  16 static void poor_mans_delay(void)
  17 {
  18         int i;
  19
  20         for (i = 0; i < 2500000; i++)
  21                 cpu_relax();
  22 }
  23
  24 static void show_value(unsigned long x)
  25 {
  26         int i;
  27         unsigned nibble;
  28         for (i = 0; i < 8; i++) {
  29                 nibble = ((x >> (i * 4)) & 0xf);
  30
  31                 __raw_writeb(nibble + ((nibble > 9) ? 55 : 48),
  32                           HDSP2534_ADDR + 0xe0 + ((7 - i) << 2));
  33         }
  34 }
  35
  36 void
  37 panic_handler(unsigned long panicPC, unsigned long panicSSR,
  38               unsigned long panicEXPEVT)
  39 {
  40         while (1) {
  41                 /* This piece of code displays the PC on the LED display */
  42                 show_value(panicPC);
  43                 poor_mans_delay();
  44                 show_value(panicSSR);
  45                 poor_mans_delay();
  46                 show_value(panicEXPEVT);
  47                 poor_mans_delay();
  48         }
  49 }