c82dc7ed96b34a2ebd8493f7ec2293faae354dea
[linux-3.10.git] / include / asm-i386 / hpet.h
1
2 #ifndef _I386_HPET_H
3 #define _I386_HPET_H
4
5 #ifdef CONFIG_HPET_TIMER
6
7 /*
8  * Documentation on HPET can be found at:
9  *      http://www.intel.com/ial/home/sp/pcmmspec.htm
10  *      ftp://download.intel.com/ial/home/sp/mmts098.pdf
11  */
12
13 #define HPET_MMAP_SIZE          1024
14
15 #define HPET_ID                 0x000
16 #define HPET_PERIOD             0x004
17 #define HPET_CFG                0x010
18 #define HPET_STATUS             0x020
19 #define HPET_COUNTER            0x0f0
20 #define HPET_T0_CFG             0x100
21 #define HPET_T0_CMP             0x108
22 #define HPET_T0_ROUTE           0x110
23 #define HPET_T1_CFG             0x120
24 #define HPET_T1_CMP             0x128
25 #define HPET_T1_ROUTE           0x130
26 #define HPET_T2_CFG             0x140
27 #define HPET_T2_CMP             0x148
28 #define HPET_T2_ROUTE           0x150
29
30 #define HPET_ID_REV             0x000000ff
31 #define HPET_ID_NUMBER          0x00001f00
32 #define HPET_ID_64BIT           0x00002000
33 #define HPET_ID_LEGSUP          0x00008000
34 #define HPET_ID_VENDOR          0xffff0000
35 #define HPET_ID_NUMBER_SHIFT    8
36 #define HPET_ID_VENDOR_SHIFT    16
37
38 #define HPET_ID_VENDOR_8086     0x8086
39
40 #define HPET_CFG_ENABLE         0x001
41 #define HPET_CFG_LEGACY         0x002
42 #define HPET_LEGACY_8254        2
43 #define HPET_LEGACY_RTC         8
44
45 #define HPET_TN_LEVEL           0x0002
46 #define HPET_TN_ENABLE          0x0004
47 #define HPET_TN_PERIODIC        0x0008
48 #define HPET_TN_PERIODIC_CAP    0x0010
49 #define HPET_TN_64BIT_CAP       0x0020
50 #define HPET_TN_SETVAL          0x0040
51 #define HPET_TN_32BIT           0x0100
52 #define HPET_TN_ROUTE           0x3e00
53 #define HPET_TN_FSB             0x4000
54 #define HPET_TN_FSB_CAP         0x8000
55 #define HPET_TN_ROUTE_SHIFT     9
56
57 /* Max HPET Period is 10^8 femto sec as in HPET spec */
58 #define HPET_MAX_PERIOD         100000000UL
59 /*
60  * Min HPET period is 10^5 femto sec just for safety. If it is less than this,
61  * then 32 bit HPET counter wrapsaround in less than 0.5 sec.
62  */
63 #define HPET_MIN_PERIOD         100000UL
64
65 /* hpet memory map physical address */
66 extern unsigned long hpet_address;
67 extern int is_hpet_enabled(void);
68 extern int hpet_enable(void);
69
70 #ifdef CONFIG_HPET_EMULATE_RTC
71
72 #include <linux/interrupt.h>
73
74 extern int hpet_mask_rtc_irq_bit(unsigned long bit_mask);
75 extern int hpet_set_rtc_irq_bit(unsigned long bit_mask);
76 extern int hpet_set_alarm_time(unsigned char hrs, unsigned char min,
77                                unsigned char sec);
78 extern int hpet_set_periodic_freq(unsigned long freq);
79 extern int hpet_rtc_dropped_irq(void);
80 extern int hpet_rtc_timer_init(void);
81 extern irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id);
82
83 #endif /* CONFIG_HPET_EMULATE_RTC */
84
85 #else
86
87 static inline int hpet_enable(void) { return 0; }
88
89 #endif /* CONFIG_HPET_TIMER */
90 #endif /* _I386_HPET_H */