mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-18 00:24:58 +08:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
70 lines
1.2 KiB
C
70 lines
1.2 KiB
C
/*
|
|
* Reset a Jazz machine.
|
|
*
|
|
* We don't trust the firmware so we do it the classic way by poking and
|
|
* stabbing at the keyboard controller ...
|
|
*/
|
|
#include <linux/jiffies.h>
|
|
#include <asm/jazz.h>
|
|
#include <asm/io.h>
|
|
#include <asm/system.h>
|
|
#include <asm/reboot.h>
|
|
#include <asm/delay.h>
|
|
|
|
#define KBD_STAT_IBF 0x02 /* Keyboard input buffer full */
|
|
|
|
static void jazz_write_output(unsigned char val)
|
|
{
|
|
int status;
|
|
|
|
do {
|
|
status = jazz_kh->command;
|
|
} while (status & KBD_STAT_IBF);
|
|
jazz_kh->data = val;
|
|
}
|
|
|
|
static void jazz_write_command(unsigned char val)
|
|
{
|
|
int status;
|
|
|
|
do {
|
|
status = jazz_kh->command;
|
|
} while (status & KBD_STAT_IBF);
|
|
jazz_kh->command = val;
|
|
}
|
|
|
|
static unsigned char jazz_read_status(void)
|
|
{
|
|
return jazz_kh->command;
|
|
}
|
|
|
|
static inline void kb_wait(void)
|
|
{
|
|
unsigned long start = jiffies;
|
|
unsigned long timeout = start + HZ/2;
|
|
|
|
do {
|
|
if (! (jazz_read_status() & 0x02))
|
|
return;
|
|
} while (time_before_eq(jiffies, timeout));
|
|
}
|
|
|
|
void jazz_machine_restart(char *command)
|
|
{
|
|
while(1) {
|
|
kb_wait();
|
|
jazz_write_command (0xd1);
|
|
kb_wait();
|
|
jazz_write_output (0x00);
|
|
}
|
|
}
|
|
|
|
void jazz_machine_halt(void)
|
|
{
|
|
}
|
|
|
|
void jazz_machine_power_off(void)
|
|
{
|
|
/* Jazz machines don't have a software power switch */
|
|
}
|