tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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#include <linux/config.h>
31
32#include <asm/fixmap.h>
33
34/*
35 * Documentation on HPET can be found at:
36 * http://www.intel.com/ial/home/sp/pcmmspec.htm
37 * ftp://download.intel.com/ial/home/sp/mmts098.pdf
38 */
39
40#define HPET_MMAP_SIZE 1024
41
42#define HPET_ID 0x000
43#define HPET_PERIOD 0x004
44#define HPET_CFG 0x010
45#define HPET_STATUS 0x020
46#define HPET_COUNTER 0x0f0
47#define HPET_T0_CFG 0x100
48#define HPET_T0_CMP 0x108
49#define HPET_T0_ROUTE 0x110
50#define HPET_T1_CFG 0x120
51#define HPET_T1_CMP 0x128
52#define HPET_T1_ROUTE 0x130
53#define HPET_T2_CFG 0x140
54#define HPET_T2_CMP 0x148
55#define HPET_T2_ROUTE 0x150
56
57#define HPET_ID_LEGSUP 0x00008000
58#define HPET_ID_NUMBER 0x00001f00
59#define HPET_ID_REV 0x000000ff
60#define HPET_ID_NUMBER_SHIFT 8
61
62#define HPET_CFG_ENABLE 0x001
63#define HPET_CFG_LEGACY 0x002
64#define HPET_LEGACY_8254 2
65#define HPET_LEGACY_RTC 8
66
67#define HPET_TN_ENABLE 0x004
68#define HPET_TN_PERIODIC 0x008
69#define HPET_TN_PERIODIC_CAP 0x010
70#define HPET_TN_SETVAL 0x040
71#define HPET_TN_32BIT 0x100
72
73/* Use our own asm for 64 bit multiply/divide */
74#define ASM_MUL64_REG(eax_out,edx_out,reg_in,eax_in) \
75 __asm__ __volatile__("mull %2" \
76 :"=a" (eax_out), "=d" (edx_out) \
77 :"r" (reg_in), "0" (eax_in))
78
79#define ASM_DIV64_REG(eax_out,edx_out,reg_in,eax_in,edx_in) \
80 __asm__ __volatile__("divl %2" \
81 :"=a" (eax_out), "=d" (edx_out) \
82 :"r" (reg_in), "0" (eax_in), "1" (edx_in))
83
84#define KERNEL_TICK_USEC (1000000UL/HZ) /* tick value in microsec */
85/* Max HPET Period is 10^8 femto sec as in HPET spec */
86#define HPET_MAX_PERIOD (100000000UL)
87/*
88 * Min HPET period is 10^5 femto sec just for safety. If it is less than this,
89 * then 32 bit HPET counter wrapsaround in less than 0.5 sec.
90 */
91#define HPET_MIN_PERIOD (100000UL)
92
93extern unsigned long hpet_tick; /* hpet clks count per tick */
94extern unsigned long hpet_address; /* hpet memory map physical address */
95extern int hpet_use_timer;
96
97extern int hpet_rtc_timer_init(void);
98extern int hpet_enable(void);
99extern int hpet_reenable(void);
100extern int is_hpet_enabled(void);
101extern int is_hpet_capable(void);
102extern int hpet_readl(unsigned long a);
103
104#ifdef CONFIG_HPET_EMULATE_RTC
105extern int hpet_mask_rtc_irq_bit(unsigned long bit_mask);
106extern int hpet_set_rtc_irq_bit(unsigned long bit_mask);
107extern int hpet_set_alarm_time(unsigned char hrs, unsigned char min, unsigned char sec);
108extern int hpet_set_periodic_freq(unsigned long freq);
109extern int hpet_rtc_dropped_irq(void);
110extern int hpet_rtc_timer_init(void);
111extern irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id, struct pt_regs *regs);
112#endif /* CONFIG_HPET_EMULATE_RTC */
113#endif /* CONFIG_HPET_TIMER */
114#endif /* _I386_HPET_H */