1 #ifndef ASM_X86_HPET_H
2 #define ASM_X86_HPET_H
3
4 #ifdef CONFIG_HPET_TIMER
5
6 #define HPET_MMAP_SIZE 1024
7
8 #define HPET_ID 0x000
9 #define HPET_PERIOD 0x004
10 #define HPET_CFG 0x010
11 #define HPET_STATUS 0x020
12 #define HPET_COUNTER 0x0f0
13 #define HPET_T0_CFG 0x100
14 #define HPET_T0_CMP 0x108
15 #define HPET_T0_ROUTE 0x110
16 #define HPET_T1_CFG 0x120
17 #define HPET_T1_CMP 0x128
18 #define HPET_T1_ROUTE 0x130
19 #define HPET_T2_CFG 0x140
20 #define HPET_T2_CMP 0x148
21 #define HPET_T2_ROUTE 0x150
22
23 #define HPET_ID_REV 0x000000ff
24 #define HPET_ID_NUMBER 0x00001f00
25 #define HPET_ID_64BIT 0x00002000
26 #define HPET_ID_LEGSUP 0x00008000
27 #define HPET_ID_VENDOR 0xffff0000
28 #define HPET_ID_NUMBER_SHIFT 8
29 #define HPET_ID_VENDOR_SHIFT 16
30
31 #define HPET_ID_VENDOR_8086 0x8086
32
33 #define HPET_CFG_ENABLE 0x001
34 #define HPET_CFG_LEGACY 0x002
35 #define HPET_LEGACY_8254 2
36 #define HPET_LEGACY_RTC 8
37
38 #define HPET_TN_LEVEL 0x0002
39 #define HPET_TN_ENABLE 0x0004
40 #define HPET_TN_PERIODIC 0x0008
41 #define HPET_TN_PERIODIC_CAP 0x0010
42 #define HPET_TN_64BIT_CAP 0x0020
43 #define HPET_TN_SETVAL 0x0040
44 #define HPET_TN_32BIT 0x0100
45 #define HPET_TN_ROUTE 0x3e00
46 #define HPET_TN_FSB 0x4000
47 #define HPET_TN_FSB_CAP 0x8000
48 #define HPET_TN_ROUTE_SHIFT 9
49
50 /* Max HPET Period is 10^8 femto sec as in HPET spec */
51 #define HPET_MAX_PERIOD 100000000UL
52 /*
53 * Min HPET period is 10^5 femto sec just for safety. If it is less than this,
54 * then 32 bit HPET counter wrapsaround in less than 0.5 sec.
55 */
56 #define HPET_MIN_PERIOD 100000UL
57
58 /* hpet memory map physical address */
59 extern unsigned long hpet_address;
60 extern unsigned long force_hpet_address;
61 extern int hpet_force_user;
62 extern int is_hpet_enabled(void);
63 extern int hpet_enable(void);
64 extern void hpet_disable(void);
65 extern unsigned long hpet_readl(unsigned long a);
66 extern void force_hpet_resume(void);
67
68 #ifdef CONFIG_HPET_EMULATE_RTC
69
70 #include <linux/interrupt.h>
71
72 typedef irqreturn_t (*rtc_irq_handler)(int interrupt, void *cookie);
73 extern int hpet_mask_rtc_irq_bit(unsigned long bit_mask);
74 extern int hpet_set_rtc_irq_bit(unsigned long bit_mask);
75 extern int hpet_set_alarm_time(unsigned char hrs, unsigned char min,
76 unsigned char sec);
77 extern int hpet_set_periodic_freq(unsigned long freq);
78 extern int hpet_rtc_dropped_irq(void);
79 extern int hpet_rtc_timer_init(void);
80 extern irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id);
81 extern int hpet_register_irq_handler(rtc_irq_handler handler);
82 extern void hpet_unregister_irq_handler(rtc_irq_handler handler);
83
84 #endif /* CONFIG_HPET_EMULATE_RTC */
85
86 #else /* CONFIG_HPET_TIMER */
87
88 static inline int hpet_enable(void) { return 0; }
89 static inline unsigned long hpet_readl(unsigned long a) { return 0; }
90 static inline int is_hpet_enabled(void) { return 0; }
91
92 #endif
93 #endif /* ASM_X86_HPET_H */
94
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