Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
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linux
1#ifndef __HPET__
2#define __HPET__ 1
3
4#include <linux/compiler.h>
5
6/*
7 * Offsets into HPET Registers
8 */
9
10struct hpet {
11 u64 hpet_cap; /* capabilities */
12 u64 res0; /* reserved */
13 u64 hpet_config; /* configuration */
14 u64 res1; /* reserved */
15 u64 hpet_isr; /* interrupt status reg */
16 u64 res2[25]; /* reserved */
17 union { /* main counter */
18 u64 _hpet_mc64;
19 u32 _hpet_mc32;
20 unsigned long _hpet_mc;
21 } _u0;
22 u64 res3; /* reserved */
23 struct hpet_timer {
24 u64 hpet_config; /* configuration/cap */
25 union { /* timer compare register */
26 u64 _hpet_hc64;
27 u32 _hpet_hc32;
28 unsigned long _hpet_compare;
29 } _u1;
30 u64 hpet_fsb[2]; /* FSB route */
31 } hpet_timers[1];
32};
33
34#define hpet_mc _u0._hpet_mc
35#define hpet_compare _u1._hpet_compare
36
37#define HPET_MAX_TIMERS (32)
38
39/*
40 * HPET general capabilities register
41 */
42
43#define HPET_COUNTER_CLK_PERIOD_MASK (0xffffffff00000000ULL)
44#define HPET_COUNTER_CLK_PERIOD_SHIFT (32UL)
45#define HPET_VENDOR_ID_MASK (0x00000000ffff0000ULL)
46#define HPET_VENDOR_ID_SHIFT (16ULL)
47#define HPET_LEG_RT_CAP_MASK (0x8000)
48#define HPET_COUNTER_SIZE_MASK (0x2000)
49#define HPET_NUM_TIM_CAP_MASK (0x1f00)
50#define HPET_NUM_TIM_CAP_SHIFT (8ULL)
51
52/*
53 * HPET general configuration register
54 */
55
56#define HPET_LEG_RT_CNF_MASK (2UL)
57#define HPET_ENABLE_CNF_MASK (1UL)
58
59
60/*
61 * Timer configuration register
62 */
63
64#define Tn_INT_ROUTE_CAP_MASK (0xffffffff00000000ULL)
65#define Tn_INI_ROUTE_CAP_SHIFT (32UL)
66#define Tn_FSB_INT_DELCAP_MASK (0x8000UL)
67#define Tn_FSB_INT_DELCAP_SHIFT (15)
68#define Tn_FSB_EN_CNF_MASK (0x4000UL)
69#define Tn_FSB_EN_CNF_SHIFT (14)
70#define Tn_INT_ROUTE_CNF_MASK (0x3e00UL)
71#define Tn_INT_ROUTE_CNF_SHIFT (9)
72#define Tn_32MODE_CNF_MASK (0x0100UL)
73#define Tn_VAL_SET_CNF_MASK (0x0040UL)
74#define Tn_SIZE_CAP_MASK (0x0020UL)
75#define Tn_PER_INT_CAP_MASK (0x0010UL)
76#define Tn_TYPE_CNF_MASK (0x0008UL)
77#define Tn_INT_ENB_CNF_MASK (0x0004UL)
78#define Tn_INT_TYPE_CNF_MASK (0x0002UL)
79
80/*
81 * Timer FSB Interrupt Route Register
82 */
83
84#define Tn_FSB_INT_ADDR_MASK (0xffffffff00000000ULL)
85#define Tn_FSB_INT_ADDR_SHIFT (32UL)
86#define Tn_FSB_INT_VAL_MASK (0x00000000ffffffffULL)
87
88struct hpet_info {
89 unsigned long hi_ireqfreq; /* Hz */
90 unsigned long hi_flags; /* information */
91 unsigned short hi_hpet;
92 unsigned short hi_timer;
93};
94
95#define HPET_INFO_PERIODIC 0x0001 /* timer is periodic */
96
97#define HPET_IE_ON _IO('h', 0x01) /* interrupt on */
98#define HPET_IE_OFF _IO('h', 0x02) /* interrupt off */
99#define HPET_INFO _IOR('h', 0x03, struct hpet_info)
100#define HPET_EPI _IO('h', 0x04) /* enable periodic */
101#define HPET_DPI _IO('h', 0x05) /* disable periodic */
102#define HPET_IRQFREQ _IOW('h', 0x6, unsigned long) /* IRQFREQ usec */
103
104/*
105 * exported interfaces
106 */
107
108struct hpet_task {
109 void (*ht_func) (void *);
110 void *ht_data;
111 void *ht_opaque;
112};
113
114struct hpet_data {
115 unsigned long hd_phys_address;
116 void __iomem *hd_address;
117 unsigned short hd_nirqs;
118 unsigned short hd_flags;
119 unsigned int hd_state; /* timer allocated */
120 unsigned int hd_irq[HPET_MAX_TIMERS];
121};
122
123#define HPET_DATA_PLATFORM 0x0001 /* platform call to hpet_alloc */
124
125static inline void hpet_reserve_timer(struct hpet_data *hd, int timer)
126{
127 hd->hd_state |= (1 << timer);
128 return;
129}
130
131int hpet_alloc(struct hpet_data *);
132int hpet_register(struct hpet_task *, int);
133int hpet_unregister(struct hpet_task *);
134int hpet_control(struct hpet_task *, unsigned int, unsigned long);
135
136#endif /* !__HPET__ */