/*
 * Copyright 2008, Dustin Howett, dustin.howett@gmail.com. All rights reserved.
 * Distributed under the terms of the MIT License.
 */
#ifndef _KERNEL_ARCH_x86_TIMERS_PIT_H
#define _KERNEL_ARCH_x86_TIMERS_PIT_H

#include <SupportDefs.h>

/* ports */
#define PIT_CTRL        0x43
#define PIT_CNT0        0x40
#define PIT_CNT1        0x41
#define PIT_CNT2        0x42

/* commands */
#define PIT_SELCH0      0x00
#define PIT_SELCH1      0x40
#define PIT_SELCH2      0x80

#define PIT_RWLOW       0x10
#define PIT_RWHIGH      0x20
#define PIT_RWBOTH      0x30

#define PIT_MD_INTON0   0x00
#define PIT_MD_ONESHOT  0x02
#define PIT_MD_RTGEN    0x04
#define PIT_MD_SQGEN    0x06
#define PIT_MD_SW_STRB  0x08
#define PIT_MD_HW_STRB  0x0A

#define PIT_BCD         0x01

#define PIT_LATCH       0x00

#define PIT_READ        0xF0
#define PIT_CNT         0x20
#define PIT_STAT        0x10

#define PIT_CLOCK_RATE  1193180
#define PIT_MAX_TIMER_INTERVAL (0xffff * 1000000ll / PIT_CLOCK_RATE)

/* Method Prototypes */
static int pit_get_prio(void);
static status_t pit_set_hardware_timer(bigtime_t relativeTimeout);
static status_t pit_clear_hardware_timer(void);
static status_t pit_init(struct kernel_args *args);

#endif /* _KERNEL_ARCH_x86_TIMERS_PIT_H */