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

DEFINITIONS

1. poor_mans_delay
2. show_value
3. panic_handler

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2003  Richard Curnow, SuperH UK Limited
   4  */
   5 
   6 #include <linux/kernel.h>
   7 #include <linux/io.h>
   8 #include <cpu/registers.h>
   9 
  10 /* THIS IS A PHYSICAL ADDRESS */
  11 #define HDSP2534_ADDR (0x04002100)
  12 
  13 static void poor_mans_delay(void)
  14 {
  15         int i;
  16 
  17         for (i = 0; i < 2500000; i++)
  18                 cpu_relax();
  19 }
  20 
  21 static void show_value(unsigned long x)
  22 {
  23         int i;
  24         unsigned nibble;
  25         for (i = 0; i < 8; i++) {
  26                 nibble = ((x >> (i * 4)) & 0xf);
  27 
  28                 __raw_writeb(nibble + ((nibble > 9) ? 55 : 48),
  29                           HDSP2534_ADDR + 0xe0 + ((7 - i) << 2));
  30         }
  31 }
  32 
  33 void
  34 panic_handler(unsigned long panicPC, unsigned long panicSSR,
  35               unsigned long panicEXPEVT)
  36 {
  37         while (1) {
  38                 /* This piece of code displays the PC on the LED display */
  39                 show_value(panicPC);
  40                 poor_mans_delay();
  41                 show_value(panicSSR);
  42                 poor_mans_delay();
  43                 show_value(panicEXPEVT);
  44                 poor_mans_delay();
  45         }
  46 }