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Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001// SPDX-License-Identifier: GPL-2.0
Linus Torvalds1da177e2005-04-16 15:20:36 -07002/*
3 * linux/arch/mips/sni/process.c
4 *
5 * Reset a SNI machine.
6 */
Ralf Baechlec8615192015-11-27 19:17:01 +01007#include <linux/delay.h>
8
Linus Torvalds1da177e2005-04-16 15:20:36 -07009#include <asm/io.h>
10#include <asm/reboot.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#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 Bogendoerferc066a322006-12-28 18:22:32 +010018static inline void kb_wait(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -070019{
20 int i;
21
Thomas Bogendoerferc066a322006-12-28 18:22:32 +010022 for (i = 0; i < 0x10000; i++)
Linus Torvalds1da177e2005-04-16 15:20:36 -070023 if ((inb_p(0x64) & 0x02) == 0)
24 break;
25}
26
27/* XXX This ends up at the ARC firmware prompt ... */
28void sni_machine_restart(char *command)
29{
Ralf Baechleec7b9722015-11-27 19:17:01 +010030 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -070031
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 Bogendoerferc066a322006-12-28 18:22:32 +010036 for (i = 0; i < 100; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070037 kb_wait();
Ralf Baechlec8615192015-11-27 19:17:01 +010038 udelay(50);
Ralf Baechle21a151d2007-10-11 23:46:15 +010039 outb_p(0xfe, 0x64); /* pulse reset low */
Ralf Baechlec8615192015-11-27 19:17:01 +010040 udelay(50);
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 }
42 }
43}
44
Linus Torvalds1da177e2005-04-16 15:20:36 -070045void sni_machine_power_off(void)
46{
47 *(volatile unsigned char *)PCIMT_CSWCSM = 0xfd;
48}