1#ifndef __I8254_H
2#define __I8254_H
3
4#include <linux/kthread.h>
5
6#include "iodev.h"
7
8struct kvm_kpit_channel_state {
9	u32 count; /* can be 65536 */
10	u16 latched_count;
11	u8 count_latched;
12	u8 status_latched;
13	u8 status;
14	u8 read_state;
15	u8 write_state;
16	u8 write_latch;
17	u8 rw_mode;
18	u8 mode;
19	u8 bcd; /* not supported */
20	u8 gate; /* timer start */
21	ktime_t count_load_time;
22};
23
24struct kvm_kpit_state {
25	struct kvm_kpit_channel_state channels[3];
26	u32 flags;
27	bool is_periodic;
28	s64 period; 				/* unit: ns */
29	struct hrtimer timer;
30	atomic_t pending;			/* accumulated triggered timers */
31	bool reinject;
32	struct kvm *kvm;
33	u32    speaker_data_on;
34	struct mutex lock;
35	struct kvm_pit *pit;
36	spinlock_t inject_lock;
37	unsigned long irq_ack;
38	struct kvm_irq_ack_notifier irq_ack_notifier;
39};
40
41struct kvm_pit {
42	struct kvm_io_device dev;
43	struct kvm_io_device speaker_dev;
44	struct kvm *kvm;
45	struct kvm_kpit_state pit_state;
46	int irq_source_id;
47	struct kvm_irq_mask_notifier mask_notifier;
48	struct kthread_worker worker;
49	struct task_struct *worker_task;
50	struct kthread_work expired;
51};
52
53#define KVM_PIT_BASE_ADDRESS	    0x40
54#define KVM_SPEAKER_BASE_ADDRESS    0x61
55#define KVM_PIT_MEM_LENGTH	    4
56#define KVM_PIT_FREQ		    1193181
57#define KVM_MAX_PIT_INTR_INTERVAL   HZ / 100
58#define KVM_PIT_CHANNEL_MASK	    0x3
59
60void kvm_pit_load_count(struct kvm *kvm, int channel, u32 val, int hpet_legacy_start);
61struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags);
62void kvm_free_pit(struct kvm *kvm);
63void kvm_pit_reset(struct kvm_pit *pit);
64
65#endif
66