| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 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/sched.h> |
| 12 | #include <linux/mm.h> |
| 13 | #include <asm/cacheflush.h> |
| 14 | #include <asm/io.h> |
| 15 | #include <asm/processor.h> |
| 16 | #include <asm/reboot.h> |
| 17 | #include <asm/system.h> |
| 18 | #include <asm/mipsregs.h> |
| 19 | |
| 20 | void cobalt_machine_restart(char *command) |
| 21 | { |
| 22 | *(volatile char *)0xbc000000 = 0x0f; |
| 23 | |
| 24 | /* |
| 25 | * Ouch, we're still alive ... This time we take the silver bullet ... |
| 26 | * ... and find that we leave the hardware in a state in which the |
| 27 | * kernel in the flush locks up somewhen during of after the PCI |
| 28 | * detection stuff. |
| 29 | */ |
| 30 | set_c0_status(ST0_BEV | ST0_ERL); |
| 31 | change_c0_config(CONF_CM_CMASK, CONF_CM_UNCACHED); |
| 32 | flush_cache_all(); |
| 33 | write_c0_wired(0); |
| 34 | __asm__ __volatile__( |
| 35 | "jr\t%0" |
| 36 | : |
| 37 | : "r" (0xbfc00000)); |
| 38 | } |
| 39 | |
| 40 | extern int led_state; |
| 41 | #define kLED 0xBC000000 |
| 42 | #define LEDSet(x) (*(volatile unsigned char *) kLED) = (( unsigned char)x) |
| 43 | |
| 44 | void cobalt_machine_halt(void) |
| 45 | { |
| 46 | int mark; |
| 47 | |
| 48 | /* Blink our cute? little LED (number 3)... */ |
| 49 | while (1) { |
| 50 | led_state = led_state | ( 1 << 3 ); |
| 51 | LEDSet(led_state); |
| 52 | mark = jiffies; |
| 53 | while (jiffies<(mark+HZ)); |
| 54 | led_state = led_state & ~( 1 << 3 ); |
| 55 | LEDSet(led_state); |
| 56 | mark = jiffies; |
| 57 | while (jiffies<(mark+HZ)); |
| 58 | } |
| 59 | } |
| 60 | |
| 61 | /* |
| 62 | * This triggers the luser mode device driver for the power switch ;-) |
| 63 | */ |
| 64 | void cobalt_machine_power_off(void) |
| 65 | { |
| 66 | printk("You can switch the machine off now.\n"); |
| 67 | cobalt_machine_halt(); |
| 68 | } |