arch/sh64/lib/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 <asm/io.h>
  11 #include <asm/registers.h>
  12
  13 /* THIS IS A PHYSICAL ADDRESS */
  14 #define HDSP2534_ADDR (0x04002100)
  15
  16 #ifdef CONFIG_SH_CAYMAN
  17
  18 static void poor_mans_delay(void)
  19 {
  20         int i;
  21         for (i = 0; i < 2500000; i++) {
  22         }               /* poor man's delay */
  23 }
  24
  25 static void show_value(unsigned long x)
  26 {
  27         int i;
  28         unsigned nibble;
  29         for (i = 0; i < 8; i++) {
  30                 nibble = ((x >> (i * 4)) & 0xf);
  31
  32                 ctrl_outb(nibble + ((nibble > 9) ? 55 : 48),
  33                           HDSP2534_ADDR + 0xe0 + ((7 - i) << 2));
  34         }
  35 }
  36
  37 #endif
  38
  39 void
  40 panic_handler(unsigned long panicPC, unsigned long panicSSR,
  41               unsigned long panicEXPEVT)
  42 {
  43 #ifdef CONFIG_SH_CAYMAN
  44         while (1) {
  45                 /* This piece of code displays the PC on the LED display */
  46                 show_value(panicPC);
  47                 poor_mans_delay();
  48                 show_value(panicSSR);
  49                 poor_mans_delay();
  50                 show_value(panicEXPEVT);
  51                 poor_mans_delay();
  52         }
  53 #endif
  54
  55         /* Never return from the panic handler */
  56         for (;;) ;
  57
  58 }