1 /*
2  * Cobalt Reset operations
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  * Copyright (C) 1995, 1996, 1997 by Ralf Baechle
9  * Copyright (C) 2001 by Liam Davies (ldavies@agile.tv)
10  *
11  */
12 #include <linux/sched.h>
13 #include <linux/mm.h>
14 #include <asm/io.h>
15 #include <asm/pgtable.h>
16 #include <asm/processor.h>
17 #include <asm/reboot.h>
18 #include <asm/system.h>
19 #include <asm/mipsregs.h>
20 
cobalt_machine_restart(char * command)21 void cobalt_machine_restart(char *command)
22 {
23 	*(volatile char *)0xbc000000 = 0x0f;
24 
25 	/*
26 	 * Ouch, we're still alive ... This time we take the silver bullet ...
27 	 * ... and find that we leave the hardware in a state in which the
28 	 * kernel in the flush locks up somewhen during of after the PCI
29 	 * detection stuff.
30 	 */
31 	set_c0_status(ST0_BEV | ST0_ERL);
32 	change_c0_config(CONF_CM_CMASK, CONF_CM_UNCACHED);
33 	flush_cache_all();
34 	write_c0_wired(0);
35 	__asm__ __volatile__(
36 		"jr\t%0"
37 		:
38 		: "r" (0xbfc00000));
39 }
40 
41 extern int led_state;
42 #define kLED            0xBC000000
43 #define LEDSet(x)       (*(volatile unsigned char *) kLED) = (( unsigned char)x)
44 
cobalt_machine_halt(void)45 void cobalt_machine_halt(void)
46 {
47 	int mark;
48 
49 	/* Blink our cute? little LED (number 3)... */
50 	while (1) {
51 		led_state = led_state | ( 1 << 3 );
52 		LEDSet(led_state);
53 		mark = jiffies;
54 		while (jiffies<(mark+HZ));
55 		led_state = led_state & ~( 1 << 3 );
56 		LEDSet(led_state);
57 		mark = jiffies;
58 		while (jiffies<(mark+HZ));
59 	}
60 }
61 
62 /*
63  * This triggers the luser mode device driver for the power switch ;-)
64  */
cobalt_machine_power_off(void)65 void cobalt_machine_power_off(void)
66 {
67 	printk("You can switch the machine off now.\n");
68 	cobalt_machine_halt();
69 }
70