1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * linux/arch/mips/sni/process.c 4*4882a593Smuzhiyun * 5*4882a593Smuzhiyun * Reset a SNI machine. 6*4882a593Smuzhiyun */ 7*4882a593Smuzhiyun #include <linux/delay.h> 8*4882a593Smuzhiyun 9*4882a593Smuzhiyun #include <asm/io.h> 10*4882a593Smuzhiyun #include <asm/reboot.h> 11*4882a593Smuzhiyun #include <asm/sni.h> 12*4882a593Smuzhiyun 13*4882a593Smuzhiyun /* 14*4882a593Smuzhiyun * This routine reboots the machine by asking the keyboard 15*4882a593Smuzhiyun * controller to pulse the reset-line low. We try that for a while, 16*4882a593Smuzhiyun * and if it doesn't work, we do some other stupid things. 17*4882a593Smuzhiyun */ kb_wait(void)18*4882a593Smuzhiyunstatic inline void kb_wait(void) 19*4882a593Smuzhiyun { 20*4882a593Smuzhiyun int i; 21*4882a593Smuzhiyun 22*4882a593Smuzhiyun for (i = 0; i < 0x10000; i++) 23*4882a593Smuzhiyun if ((inb_p(0x64) & 0x02) == 0) 24*4882a593Smuzhiyun break; 25*4882a593Smuzhiyun } 26*4882a593Smuzhiyun 27*4882a593Smuzhiyun /* XXX This ends up at the ARC firmware prompt ... */ sni_machine_restart(char * command)28*4882a593Smuzhiyunvoid sni_machine_restart(char *command) 29*4882a593Smuzhiyun { 30*4882a593Smuzhiyun int i; 31*4882a593Smuzhiyun 32*4882a593Smuzhiyun /* This does a normal via the keyboard controller like a PC. 33*4882a593Smuzhiyun We can do that easier ... */ 34*4882a593Smuzhiyun local_irq_disable(); 35*4882a593Smuzhiyun for (;;) { 36*4882a593Smuzhiyun for (i = 0; i < 100; i++) { 37*4882a593Smuzhiyun kb_wait(); 38*4882a593Smuzhiyun udelay(50); 39*4882a593Smuzhiyun outb_p(0xfe, 0x64); /* pulse reset low */ 40*4882a593Smuzhiyun udelay(50); 41*4882a593Smuzhiyun } 42*4882a593Smuzhiyun } 43*4882a593Smuzhiyun } 44*4882a593Smuzhiyun sni_machine_power_off(void)45*4882a593Smuzhiyunvoid sni_machine_power_off(void) 46*4882a593Smuzhiyun { 47*4882a593Smuzhiyun *(volatile unsigned char *)PCIMT_CSWCSM = 0xfd; 48*4882a593Smuzhiyun } 49