1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_HPET_H
3 #define _ASM_X86_HPET_H
4
5 #include <linux/msi.h>
6
7 #ifdef CONFIG_HPET_TIMER
8
9 #define HPET_MMAP_SIZE 1024
10
11 #define HPET_ID 0x000
12 #define HPET_PERIOD 0x004
13 #define HPET_CFG 0x010
14 #define HPET_STATUS 0x020
15 #define HPET_COUNTER 0x0f0
16
17 #define HPET_Tn_CFG(n) (0x100 + 0x20 * n)
18 #define HPET_Tn_CMP(n) (0x108 + 0x20 * n)
19 #define HPET_Tn_ROUTE(n) (0x110 + 0x20 * n)
20
21 #define HPET_T0_CFG 0x100
22 #define HPET_T0_CMP 0x108
23 #define HPET_T0_ROUTE 0x110
24 #define HPET_T1_CFG 0x120
25 #define HPET_T1_CMP 0x128
26 #define HPET_T1_ROUTE 0x130
27 #define HPET_T2_CFG 0x140
28 #define HPET_T2_CMP 0x148
29 #define HPET_T2_ROUTE 0x150
30
31 #define HPET_ID_REV 0x000000ff
32 #define HPET_ID_NUMBER 0x00001f00
33 #define HPET_ID_64BIT 0x00002000
34 #define HPET_ID_LEGSUP 0x00008000
35 #define HPET_ID_VENDOR 0xffff0000
36 #define HPET_ID_NUMBER_SHIFT 8
37 #define HPET_ID_VENDOR_SHIFT 16
38
39 #define HPET_CFG_ENABLE 0x001
40 #define HPET_CFG_LEGACY 0x002
41 #define HPET_LEGACY_8254 2
42 #define HPET_LEGACY_RTC 8
43
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
55
56 /* Max HPET Period is 10^8 femto sec as in HPET spec */
57 #define HPET_MAX_PERIOD 100000000UL
58 /*
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.
61 */
62 #define HPET_MIN_PERIOD 100000UL
63
64 /* hpet memory map physical address */
65 extern unsigned long hpet_address;
66 extern unsigned long force_hpet_address;
67 extern bool boot_hpet_disable;
68 extern u8 hpet_blockid;
69 extern bool hpet_force_user;
70 extern bool hpet_msi_disable;
71 extern int is_hpet_enabled(void);
72 extern int hpet_enable(void);
73 extern void hpet_disable(void);
74 extern unsigned int hpet_readl(unsigned int a);
75 extern void force_hpet_resume(void);
76
77 #ifdef CONFIG_HPET_EMULATE_RTC
78
79 #include <linux/interrupt.h>
80
81 typedef irqreturn_t (*rtc_irq_handler)(int interrupt, void *cookie);
82 extern int hpet_mask_rtc_irq_bit(unsigned long bit_mask);
83 extern int hpet_set_rtc_irq_bit(unsigned long bit_mask);
84 extern int hpet_set_alarm_time(unsigned char hrs, unsigned char min,
85 unsigned char sec);
86 extern int hpet_set_periodic_freq(unsigned long freq);
87 extern int hpet_rtc_dropped_irq(void);
88 extern int hpet_rtc_timer_init(void);
89 extern irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id);
90 extern int hpet_register_irq_handler(rtc_irq_handler handler);
91 extern void hpet_unregister_irq_handler(rtc_irq_handler handler);
92
93 #endif /* CONFIG_HPET_EMULATE_RTC */
94
95 #else /* CONFIG_HPET_TIMER */
96
97 static inline int hpet_enable(void) { return 0; }
98 static inline int is_hpet_enabled(void) { return 0; }
99 #define hpet_readl(a) 0
100 #define default_setup_hpet_msi NULL
101
102 #endif
103 #endif /* _ASM_X86_HPET_H */
104
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