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