| john stultz | 8d016ef | 2006-06-26 00:25:09 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * i8253.c 8253/PIT functions |
| 3 | * |
| 4 | */ |
| 5 | #include <linux/spinlock.h> |
| 6 | #include <linux/jiffies.h> |
| 7 | #include <linux/sysdev.h> |
| 8 | #include <linux/module.h> |
| 9 | #include <linux/init.h> |
| 10 | |
| 11 | #include <asm/smp.h> |
| 12 | #include <asm/delay.h> |
| 13 | #include <asm/i8253.h> |
| 14 | #include <asm/io.h> |
| 15 | |
| 16 | #include "io_ports.h" |
| 17 | |
| 18 | DEFINE_SPINLOCK(i8253_lock); |
| 19 | EXPORT_SYMBOL(i8253_lock); |
| 20 | |
| 21 | void setup_pit_timer(void) |
| 22 | { |
| 23 | unsigned long flags; |
| 24 | |
| 25 | spin_lock_irqsave(&i8253_lock, flags); |
| 26 | outb_p(0x34,PIT_MODE); /* binary, mode 2, LSB/MSB, ch 0 */ |
| 27 | udelay(10); |
| 28 | outb_p(LATCH & 0xff , PIT_CH0); /* LSB */ |
| 29 | udelay(10); |
| 30 | outb(LATCH >> 8 , PIT_CH0); /* MSB */ |
| 31 | spin_unlock_irqrestore(&i8253_lock, flags); |
| 32 | } |