Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | /* |
| 3 | * linux/arch/mips/sni/process.c |
| 4 | * |
| 5 | * Reset a SNI machine. |
| 6 | */ |
Ralf Baechle | c861519 | 2015-11-27 19:17:01 +0100 | [diff] [blame] | 7 | #include <linux/delay.h> |
| 8 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | #include <asm/io.h> |
| 10 | #include <asm/reboot.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #include <asm/sni.h> |
| 12 | |
| 13 | /* |
| 14 | * This routine reboots the machine by asking the keyboard |
| 15 | * controller to pulse the reset-line low. We try that for a while, |
| 16 | * and if it doesn't work, we do some other stupid things. |
| 17 | */ |
Thomas Bogendoerfer | c066a32 | 2006-12-28 18:22:32 +0100 | [diff] [blame] | 18 | static inline void kb_wait(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | { |
| 20 | int i; |
| 21 | |
Thomas Bogendoerfer | c066a32 | 2006-12-28 18:22:32 +0100 | [diff] [blame] | 22 | for (i = 0; i < 0x10000; i++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | if ((inb_p(0x64) & 0x02) == 0) |
| 24 | break; |
| 25 | } |
| 26 | |
| 27 | /* XXX This ends up at the ARC firmware prompt ... */ |
| 28 | void sni_machine_restart(char *command) |
| 29 | { |
Ralf Baechle | ec7b972 | 2015-11-27 19:17:01 +0100 | [diff] [blame] | 30 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | |
| 32 | /* This does a normal via the keyboard controller like a PC. |
| 33 | We can do that easier ... */ |
| 34 | local_irq_disable(); |
| 35 | for (;;) { |
Thomas Bogendoerfer | c066a32 | 2006-12-28 18:22:32 +0100 | [diff] [blame] | 36 | for (i = 0; i < 100; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | kb_wait(); |
Ralf Baechle | c861519 | 2015-11-27 19:17:01 +0100 | [diff] [blame] | 38 | udelay(50); |
Ralf Baechle | 21a151d | 2007-10-11 23:46:15 +0100 | [diff] [blame] | 39 | outb_p(0xfe, 0x64); /* pulse reset low */ |
Ralf Baechle | c861519 | 2015-11-27 19:17:01 +0100 | [diff] [blame] | 40 | udelay(50); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | } |
| 42 | } |
| 43 | } |
| 44 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | void sni_machine_power_off(void) |
| 46 | { |
| 47 | *(volatile unsigned char *)PCIMT_CSWCSM = 0xfd; |
| 48 | } |