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#ifndef _I386_HPET_H
#define _I386_HPET_H

#ifdef CONFIG_HPET_TIMER

#include <linux/errno.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/param.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/time.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/smp.h>

#include <asm/io.h>
#include <asm/smp.h>
#include <asm/irq.h>
#include <asm/msr.h>
#include <asm/delay.h>
#include <asm/mpspec.h>
#include <asm/uaccess.h>
#include <asm/processor.h>

#include <linux/timex.h>
#include <linux/config.h>

#include <asm/fixmap.h>

/*
 * Documentation on HPET can be found at:
 *      http://www.intel.com/ial/home/sp/pcmmspec.htm
 *      ftp://download.intel.com/ial/home/sp/mmts098.pdf
 */

#define HPET_MMAP_SIZE  1024

#define HPET_ID         0x000
#define HPET_PERIOD     0x004
#define HPET_CFG        0x010
#define HPET_STATUS     0x020
#define HPET_COUNTER    0x0f0
#define HPET_T0_CFG     0x100
#define HPET_T0_CMP     0x108
#define HPET_T0_ROUTE   0x110
#define HPET_T1_CFG     0x120
#define HPET_T1_CMP     0x128
#define HPET_T1_ROUTE   0x130
#define HPET_T2_CFG     0x140
#define HPET_T2_CMP     0x148
#define HPET_T2_ROUTE   0x150

#define HPET_ID_VENDOR  0xffff0000
#define HPET_ID_LEGSUP  0x00008000
#define HPET_ID_NUMBER  0x00001f00
#define HPET_ID_REV     0x000000ff

#define HPET_ID_VENDOR_SHIFT    16
#define HPET_ID_VENDOR_8086     0x8086

#define HPET_CFG_ENABLE 0x001
#define HPET_CFG_LEGACY 0x002

#define HPET_TN_ENABLE          0x004
#define HPET_TN_PERIODIC        0x008
#define HPET_TN_PERIODIC_CAP    0x010
#define HPET_TN_SETVAL          0x040
#define HPET_TN_32BIT           0x100

/* Use our own asm for 64 bit multiply/divide */
#define ASM_MUL64_REG(eax_out,edx_out,reg_in,eax_in)                    \
                __asm__ __volatile__("mull %2"                          \
                                :"=a" (eax_out), "=d" (edx_out)         \
                                :"r" (reg_in), "0" (eax_in))

#define ASM_DIV64_REG(eax_out,edx_out,reg_in,eax_in,edx_in)             \
                __asm__ __volatile__("divl %2"                          \
                                :"=a" (eax_out), "=d" (edx_out)         \
                                :"r" (reg_in), "0" (eax_in), "1" (edx_in))

#define KERNEL_TICK_USEC        (1000000UL/HZ)  /* tick value in microsec */
/* Max HPET Period is 10^8 femto sec as in HPET spec */
#define HPET_MAX_PERIOD (100000000UL)
/*
 * Min HPET period is 10^5 femto sec just for safety. If it is less than this,
 * then 32 bit HPET counter wrapsaround in less than 0.5 sec.
 */
#define HPET_MIN_PERIOD (100000UL)

extern unsigned long hpet_period;       /* fsecs / HPET clock */
extern unsigned long hpet_tick;         /* hpet clks count per tick */
extern unsigned long hpet_address;      /* hpet memory map physical address */

extern int hpet_rtc_timer_init(void);
extern int hpet_enable(void);
extern int is_hpet_enabled(void);
extern int is_hpet_capable(void);
extern int hpet_readl(unsigned long a);
extern void hpet_writel(unsigned long d, unsigned long a);

#ifdef CONFIG_HPET_EMULATE_RTC
extern int hpet_mask_rtc_irq_bit(unsigned long bit_mask);
extern int hpet_set_rtc_irq_bit(unsigned long bit_mask);
extern int hpet_set_alarm_time(unsigned char hrs, unsigned char min, unsigned char sec);
extern int hpet_set_periodic_freq(unsigned long freq);
extern int hpet_rtc_dropped_irq(void);
extern int hpet_rtc_timer_init(void);
extern irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id, struct pt_regs *regs);
#endif /* CONFIG_HPET_EMULATE_RTC */
#endif /* CONFIG_HPET_TIMER */
#endif /* _I386_HPET_H */