mirror of
https://github.com/torvalds/linux.git
synced 2024-11-17 09:31:50 +00:00
33 lines
649 B
C
33 lines
649 B
C
|
/*
|
||
|
|
* i8253.c 8253/PIT functions
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
#include <linux/spinlock.h>
|
||
|
|
#include <linux/jiffies.h>
|
||
|
|
#include <linux/sysdev.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/init.h>
|
||
|
|
|
||
|
|
#include <asm/smp.h>
|
||
|
|
#include <asm/delay.h>
|
||
|
|
#include <asm/i8253.h>
|
||
|
|
#include <asm/io.h>
|
||
|
|
|
||
|
|
#include "io_ports.h"
|
||
|
|
|
||
|
|
DEFINE_SPINLOCK(i8253_lock);
|
||
|
|
EXPORT_SYMBOL(i8253_lock);
|
||
|
|
|
||
|
|
void setup_pit_timer(void)
|
||
|
|
{
|
||
|
|
unsigned long flags;
|
||
|
|
|
||
|
|
spin_lock_irqsave(&i8253_lock, flags);
|
||
|
|
outb_p(0x34,PIT_MODE); /* binary, mode 2, LSB/MSB, ch 0 */
|
||
|
|
udelay(10);
|
||
|
|
outb_p(LATCH & 0xff , PIT_CH0); /* LSB */
|
||
|
|
udelay(10);
|
||
|
|
outb(LATCH >> 8 , PIT_CH0); /* MSB */
|
||
|
|
spin_unlock_irqrestore(&i8253_lock, flags);
|
||
|
|
}
|