1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * linux/arch/mips/sni/process.c 4 * 5 * Reset a SNI machine. 6 */ 7 #include <linux/delay.h> 8 9 #include <asm/io.h> 10 #include <asm/reboot.h> 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 */ 18 static inline void kb_wait(void) 19 { 20 int i; 21 22 for (i = 0; i < 0x10000; i++) 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 { 30 int i; 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 (;;) { 36 for (i = 0; i < 100; i++) { 37 kb_wait(); 38 udelay(50); 39 outb_p(0xfe, 0x64); /* pulse reset low */ 40 udelay(50); 41 } 42 } 43 } 44 45 void sni_machine_power_off(void) 46 { 47 *(volatile unsigned char *)PCIMT_CSWCSM = 0xfd; 48 } 49