4 #ifdef CONFIG_HPET_TIMER
7 * Documentation on HPET can be found at:
8 * http://www.intel.com/ial/home/sp/pcmmspec.htm
9 * ftp://download.intel.com/ial/home/sp/mmts098.pdf
12 #define HPET_MMAP_SIZE 1024
15 #define HPET_PERIOD 0x004
16 #define HPET_CFG 0x010
17 #define HPET_STATUS 0x020
18 #define HPET_COUNTER 0x0f0
19 #define HPET_T0_CFG 0x100
20 #define HPET_T0_CMP 0x108
21 #define HPET_T0_ROUTE 0x110
22 #define HPET_T1_CFG 0x120
23 #define HPET_T1_CMP 0x128
24 #define HPET_T1_ROUTE 0x130
25 #define HPET_T2_CFG 0x140
26 #define HPET_T2_CMP 0x148
27 #define HPET_T2_ROUTE 0x150
29 #define HPET_ID_REV 0x000000ff
30 #define HPET_ID_NUMBER 0x00001f00
31 #define HPET_ID_64BIT 0x00002000
32 #define HPET_ID_LEGSUP 0x00008000
33 #define HPET_ID_VENDOR 0xffff0000
34 #define HPET_ID_NUMBER_SHIFT 8
35 #define HPET_ID_VENDOR_SHIFT 16
37 #define HPET_ID_VENDOR_8086 0x8086
39 #define HPET_CFG_ENABLE 0x001
40 #define HPET_CFG_LEGACY 0x002
41 #define HPET_LEGACY_8254 2
42 #define HPET_LEGACY_RTC 8
44 #define HPET_TN_LEVEL 0x0002
45 #define HPET_TN_ENABLE 0x0004
46 #define HPET_TN_PERIODIC 0x0008
47 #define HPET_TN_PERIODIC_CAP 0x0010
48 #define HPET_TN_64BIT_CAP 0x0020
49 #define HPET_TN_SETVAL 0x0040
50 #define HPET_TN_32BIT 0x0100
51 #define HPET_TN_ROUTE 0x3e00
52 #define HPET_TN_FSB 0x4000
53 #define HPET_TN_FSB_CAP 0x8000
54 #define HPET_TN_ROUTE_SHIFT 9
56 /* Max HPET Period is 10^8 femto sec as in HPET spec */
57 #define HPET_MAX_PERIOD 100000000UL
59 * Min HPET period is 10^5 femto sec just for safety. If it is less than this,
60 * then 32 bit HPET counter wrapsaround in less than 0.5 sec.
62 #define HPET_MIN_PERIOD 100000UL
64 /* hpet memory map physical address */
65 extern unsigned long hpet_address
;
66 extern unsigned long force_hpet_address
;
67 extern int is_hpet_enabled(void);
68 extern int hpet_enable(void);
69 extern unsigned long hpet_readl(unsigned long a
);
70 extern void force_hpet_resume(void);
72 #ifdef CONFIG_HPET_EMULATE_RTC
74 #include <linux/interrupt.h>
76 extern int hpet_mask_rtc_irq_bit(unsigned long bit_mask
);
77 extern int hpet_set_rtc_irq_bit(unsigned long bit_mask
);
78 extern int hpet_set_alarm_time(unsigned char hrs
, unsigned char min
,
80 extern int hpet_set_periodic_freq(unsigned long freq
);
81 extern int hpet_rtc_dropped_irq(void);
82 extern int hpet_rtc_timer_init(void);
83 extern irqreturn_t
hpet_rtc_interrupt(int irq
, void *dev_id
);
85 #endif /* CONFIG_HPET_EMULATE_RTC */
89 static inline int hpet_enable(void) { return 0; }
90 static inline unsigned long hpet_readl(unsigned long a
) { return 0; }
92 #endif /* CONFIG_HPET_TIMER */
93 #endif /* ASM_X86_HPET_H */