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 
poor_mans_delay(void)16 static void poor_mans_delay(void)
17 {
18 	int i;
19 
20 	for (i = 0; i < 2500000; i++)
21 		cpu_relax();
22 }
23 
show_value(unsigned long x)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
panic_handler(unsigned long panicPC,unsigned long panicSSR,unsigned long panicEXPEVT)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 }
50