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 */
65extern unsigned long hpet_address;
66extern unsigned long force_hpet_address;
67extern bool boot_hpet_disable;
68extern u8 hpet_blockid;
69extern bool hpet_force_user;
70extern bool hpet_msi_disable;
71extern int is_hpet_enabled(void);
72extern int hpet_enable(void);
73extern void hpet_disable(void);
74extern unsigned int hpet_readl(unsigned int a);
75extern void force_hpet_resume(void);
76
77#ifdef CONFIG_HPET_EMULATE_RTC
78
79#include <linux/interrupt.h>
80
81typedef irqreturn_t (*rtc_irq_handler)(int interrupt, void *cookie);
82extern int hpet_mask_rtc_irq_bit(unsigned long bit_mask);
83extern int hpet_set_rtc_irq_bit(unsigned long bit_mask);
84extern int hpet_set_alarm_time(unsigned char hrs, unsigned char min,
85			       unsigned char sec);
86extern int hpet_set_periodic_freq(unsigned long freq);
87extern int hpet_rtc_dropped_irq(void);
88extern int hpet_rtc_timer_init(void);
89extern irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id);
90extern int hpet_register_irq_handler(rtc_irq_handler handler);
91extern void hpet_unregister_irq_handler(rtc_irq_handler handler);
92
93#endif /* CONFIG_HPET_EMULATE_RTC */
94
95#else /* CONFIG_HPET_TIMER */
96
97static inline int hpet_enable(void) { return 0; }
98static 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