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/*
* arch/i386/mach-generic/mach_reboot.h
*
* Machine specific reboot functions for generic.
* Split out from reboot.c by Osamu Tomita <tomita@cinet.co.jp>
*/
#ifndef _MACH_REBOOT_H
#define _MACH_REBOOT_H
static inline void kb_wait(void)
{
int i;
for (i = 0; i < 0x10000; i++)
if ((inb_p(0x64) & 0x02) == 0)
break;
}
static inline void mach_reboot(void)
{
int i;
/* old method, works on most machines */
for (i = 0; i < 10; i++) {
kb_wait();
udelay(50);
outb(0xfe, 0x64); /* pulse reset low */
udelay(50);
}
/* New method: sets the "System flag" which, when set, indicates
* successful completion of the keyboard controller self-test (Basic
* Assurance Test, BAT). This is needed for some machines with no
* keyboard plugged in. This read-modify-write sequence sets only the
* system flag
*/
for (i = 0; i < 10; i++) {
int cmd;
outb(0x20, 0x64); /* read Controller Command Byte */
udelay(50);
kb_wait();
udelay(50);
cmd = inb(0x60);
udelay(50);
kb_wait();
udelay(50);
outb(0x60, 0x64); /* write Controller Command Byte */
udelay(50);
kb_wait();
udelay(50);
outb(cmd | 0x04, 0x60); /* set "System flag" */
udelay(50);
kb_wait();
udelay(50);
outb(0xfe, 0x64); /* pulse reset low */
udelay(50);
}
}
#endif /* !_MACH_REBOOT_H */
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