1 2#ifndef _I386_HPET_H 3#define _I386_HPET_H 4 5#ifdef CONFIG_HPET_TIMER 6 7#include <linux/errno.h> 8#include <linux/module.h> 9#include <linux/sched.h> 10#include <linux/kernel.h> 11#include <linux/param.h> 12#include <linux/string.h> 13#include <linux/mm.h> 14#include <linux/interrupt.h> 15#include <linux/time.h> 16#include <linux/delay.h> 17#include <linux/init.h> 18#include <linux/smp.h> 19 20#include <asm/io.h> 21#include <asm/smp.h> 22#include <asm/irq.h> 23#include <asm/msr.h> 24#include <asm/delay.h> 25#include <asm/mpspec.h> 26#include <asm/uaccess.h> 27#include <asm/processor.h> 28 29#include <linux/timex.h> 30 31/* 32 * Documentation on HPET can be found at: 33 * http://www.intel.com/ial/home/sp/pcmmspec.htm 34 * ftp://download.intel.com/ial/home/sp/mmts098.pdf 35 */ 36 37#define HPET_MMAP_SIZE 1024 38 39#define HPET_ID 0x000 40#define HPET_PERIOD 0x004 41#define HPET_CFG 0x010 42#define HPET_STATUS 0x020 43#define HPET_COUNTER 0x0f0 44#define HPET_T0_CFG 0x100 45#define HPET_T0_CMP 0x108 46#define HPET_T0_ROUTE 0x110 47#define HPET_T1_CFG 0x120 48#define HPET_T1_CMP 0x128 49#define HPET_T1_ROUTE 0x130 50#define HPET_T2_CFG 0x140 51#define HPET_T2_CMP 0x148 52#define HPET_T2_ROUTE 0x150 53 54#define HPET_ID_LEGSUP 0x00008000 55#define HPET_ID_NUMBER 0x00001f00 56#define HPET_ID_REV 0x000000ff 57#define HPET_ID_NUMBER_SHIFT 8 58 59#define HPET_CFG_ENABLE 0x001 60#define HPET_CFG_LEGACY 0x002 61#define HPET_LEGACY_8254 2 62#define HPET_LEGACY_RTC 8 63 64#define HPET_TN_ENABLE 0x004 65#define HPET_TN_PERIODIC 0x008 66#define HPET_TN_PERIODIC_CAP 0x010 67#define HPET_TN_SETVAL 0x040 68#define HPET_TN_32BIT 0x100 69 70/* Use our own asm for 64 bit multiply/divide */ 71#define ASM_MUL64_REG(eax_out,edx_out,reg_in,eax_in) \ 72 __asm__ __volatile__("mull %2" \ 73 :"=a" (eax_out), "=d" (edx_out) \ 74 :"r" (reg_in), "0" (eax_in)) 75 76#define ASM_DIV64_REG(eax_out,edx_out,reg_in,eax_in,edx_in) \ 77 __asm__ __volatile__("divl %2" \ 78 :"=a" (eax_out), "=d" (edx_out) \ 79 :"r" (reg_in), "0" (eax_in), "1" (edx_in)) 80 81#define KERNEL_TICK_USEC (1000000UL/HZ) /* tick value in microsec */ 82/* Max HPET Period is 10^8 femto sec as in HPET spec */ 83#define HPET_MAX_PERIOD (100000000UL) 84/* 85 * Min HPET period is 10^5 femto sec just for safety. If it is less than this, 86 * then 32 bit HPET counter wrapsaround in less than 0.5 sec. 87 */ 88#define HPET_MIN_PERIOD (100000UL) 89#define HPET_TICK_RATE (HZ * 100000UL) 90 91extern unsigned long hpet_address; /* hpet memory map physical address */ 92extern int is_hpet_enabled(void); 93 94#ifdef CONFIG_X86_64 95extern unsigned long hpet_tick; /* hpet clks count per tick */ 96extern int hpet_use_timer; 97extern int hpet_rtc_timer_init(void); 98extern int hpet_enable(void); 99extern int is_hpet_capable(void); 100extern int hpet_readl(unsigned long a); 101#else 102extern int hpet_enable(void); 103#endif 104 105#ifdef CONFIG_HPET_EMULATE_RTC 106extern int hpet_mask_rtc_irq_bit(unsigned long bit_mask); 107extern int hpet_set_rtc_irq_bit(unsigned long bit_mask); 108extern int hpet_set_alarm_time(unsigned char hrs, unsigned char min, unsigned char sec); 109extern int hpet_set_periodic_freq(unsigned long freq); 110extern int hpet_rtc_dropped_irq(void); 111extern int hpet_rtc_timer_init(void); 112extern irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id); 113#endif /* CONFIG_HPET_EMULATE_RTC */ 114 115#else 116 117static inline int hpet_enable(void) { return 0; } 118 119#endif /* CONFIG_HPET_TIMER */ 120#endif /* _I386_HPET_H */ 121