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 #include <linux/init.h> 12 #include <linux/io.h> 13 #include <linux/jiffies.h> 14 #include <linux/leds.h> 15 16 #include <cobalt.h> 17 18 #define RESET_PORT ((void __iomem *)CKSEG1ADDR(0x1c000000)) 19 #define RESET 0x0f 20 21 DEFINE_LED_TRIGGER(power_off_led_trigger); 22 23 static int __init ledtrig_power_off_init(void) 24 { 25 led_trigger_register_simple("power-off", &power_off_led_trigger); 26 return 0; 27 } 28 device_initcall(ledtrig_power_off_init); 29 30 void cobalt_machine_halt(void) 31 { 32 int state, last, diff; 33 unsigned long mark; 34 35 /* 36 * turn on power off LED on RaQ 37 * 38 * restart if ENTER and SELECT are pressed 39 */ 40 41 last = COBALT_KEY_PORT; 42 43 led_trigger_event(power_off_led_trigger, LED_FULL); 44 45 for (state = 0;;) { 46 diff = COBALT_KEY_PORT ^ last; 47 last ^= diff; 48 49 if((diff & (COBALT_KEY_ENTER | COBALT_KEY_SELECT)) && !(~last & (COBALT_KEY_ENTER | COBALT_KEY_SELECT))) 50 writeb(RESET, RESET_PORT); 51 52 for (mark = jiffies; jiffies - mark < HZ;) 53 ; 54 } 55 } 56 57 void cobalt_machine_restart(char *command) 58 { 59 writeb(RESET, RESET_PORT); 60 61 /* we should never get here */ 62 cobalt_machine_halt(); 63 } 64 65 /* 66 * This triggers the luser mode device driver for the power switch ;-) 67 */ 68 void cobalt_machine_power_off(void) 69 { 70 printk("You can switch the machine off now.\n"); 71 cobalt_machine_halt(); 72 } 73