5c7dd7acc3
repo: https://github.com/T-head-Semi/linux commit: b1313fe517ca3703119dcc99ef3bbf75ab42bcfb Change-Id: I6cbb35294024ea3a66140e311f4bb705fd7fd626
49 lines
963 B
C
49 lines
963 B
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* linux/arch/mips/sni/process.c
|
|
*
|
|
* Reset a SNI machine.
|
|
*/
|
|
#include <linux/delay.h>
|
|
|
|
#include <asm/io.h>
|
|
#include <asm/reboot.h>
|
|
#include <asm/sni.h>
|
|
|
|
/*
|
|
* This routine reboots the machine by asking the keyboard
|
|
* controller to pulse the reset-line low. We try that for a while,
|
|
* and if it doesn't work, we do some other stupid things.
|
|
*/
|
|
static inline void kb_wait(void)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < 0x10000; i++)
|
|
if ((inb_p(0x64) & 0x02) == 0)
|
|
break;
|
|
}
|
|
|
|
/* XXX This ends up at the ARC firmware prompt ... */
|
|
void sni_machine_restart(char *command)
|
|
{
|
|
int i;
|
|
|
|
/* This does a normal via the keyboard controller like a PC.
|
|
We can do that easier ... */
|
|
local_irq_disable();
|
|
for (;;) {
|
|
for (i = 0; i < 100; i++) {
|
|
kb_wait();
|
|
udelay(50);
|
|
outb_p(0xfe, 0x64); /* pulse reset low */
|
|
udelay(50);
|
|
}
|
|
}
|
|
}
|
|
|
|
void sni_machine_power_off(void)
|
|
{
|
|
*(volatile unsigned char *)PCIMT_CSWCSM = 0xfd;
|
|
}
|