[mirror_ubuntu-eoan-kernel.git] / arch / mips / sni / reset.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;
}
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
1da177e4 LT	2	/*
	3	* linux/arch/mips/sni/process.c
	4	*
	5	* Reset a SNI machine.
	6	*/
c861519f RB	7	#include <linux/delay.h>
c861519f RB	8
1da177e4 LT	9	#include <asm/io.h>
1da177e4 LT	10	#include <asm/reboot.h>
1da177e4 LT	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	*/
c066a32a	18	static inline void kb_wait(void)
1da177e4 LT	19	{
	20	int i;
	21
c066a32a	22	for (i = 0; i < 0x10000; i++)
1da177e4 LT	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	{
ec7b9720	30	int i;
1da177e4 LT	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 (;;) {
c066a32a	36	for (i = 0; i < 100; i++) {
1da177e4	37	kb_wait();
c861519f	38	udelay(50);
21a151d8	39	outb_p(0xfe, 0x64); /* pulse reset low */
c861519f	40	udelay(50);
1da177e4 LT	41	}
	42	}
	43	}
	44
1da177e4 LT	45	void sni_machine_power_off(void)
	46	{
	47	(volatile unsigned char )PCIMT_CSWCSM = 0xfd;
	48	}