reset.c

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/*
 *  linux/arch/mips/sni/process.c
 *
 *  Reset a SNI machine.
 */
#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, j;

    /* 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();
            for (j = 0; j < 100000 ; j++)
                /* nothing */;
            outb_p(0xfe, 0x64);  /* pulse reset low */
        }
    }
}

void sni_machine_power_off(void)
{
    *(volatile unsigned char *)PCIMT_CSWCSM = 0xfd;
}