| /* |
| * 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); |
| } |
