1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef __I8254_H
 3#define __I8254_H
 4
 5#include <linux/kthread.h>
 6
 7#include <kvm/iodev.h>
 8
 9struct kvm_kpit_channel_state {
10	u32 count; /* can be 65536 */
11	u16 latched_count;
12	u8 count_latched;
13	u8 status_latched;
14	u8 status;
15	u8 read_state;
16	u8 write_state;
17	u8 write_latch;
18	u8 rw_mode;
19	u8 mode;
20	u8 bcd; /* not supported */
21	u8 gate; /* timer start */
22	ktime_t count_load_time;
23};
24
25struct kvm_kpit_state {
26	/* All members before "struct mutex lock" are protected by the lock. */
27	struct kvm_kpit_channel_state channels[3];
28	u32 flags;
29	bool is_periodic;
30	s64 period; 				/* unit: ns */
31	struct hrtimer timer;
 
32
33	struct mutex lock;
34	atomic_t reinject;
35	atomic_t pending; /* accumulated triggered timers */
36	atomic_t irq_ack;
37	struct kvm_irq_ack_notifier irq_ack_notifier;
38};
39
40struct kvm_pit {
41	struct kvm_io_device dev;
42	struct kvm_io_device speaker_dev;
43	struct kvm *kvm;
44	struct kvm_kpit_state pit_state;
45	int irq_source_id;
46	struct kvm_irq_mask_notifier mask_notifier;
47	struct kthread_worker *worker;
48	struct kthread_work expired;
49};
50
51#define KVM_PIT_BASE_ADDRESS	    0x40
52#define KVM_SPEAKER_BASE_ADDRESS    0x61
53#define KVM_PIT_MEM_LENGTH	    4
54#define KVM_PIT_FREQ		    1193181
55#define KVM_MAX_PIT_INTR_INTERVAL   HZ / 100
56#define KVM_PIT_CHANNEL_MASK	    0x3
57
58struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags);
59void kvm_free_pit(struct kvm *kvm);
60
61void kvm_pit_load_count(struct kvm_pit *pit, int channel, u32 val,
62		int hpet_legacy_start);
63void kvm_pit_set_reinject(struct kvm_pit *pit, bool reinject);
64
65#endif

 1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef __I8254_H
 3#define __I8254_H
 4
 5#include <linux/kthread.h>
 6
 7#include <kvm/iodev.h>
 8
 9struct kvm_kpit_channel_state {
10	u32 count; /* can be 65536 */
11	u16 latched_count;
12	u8 count_latched;
13	u8 status_latched;
14	u8 status;
15	u8 read_state;
16	u8 write_state;
17	u8 write_latch;
18	u8 rw_mode;
19	u8 mode;
20	u8 bcd; /* not supported */
21	u8 gate; /* timer start */
22	ktime_t count_load_time;
23};
24
25struct kvm_kpit_state {
26	/* All members before "struct mutex lock" are protected by the lock. */
27	struct kvm_kpit_channel_state channels[3];
28	u32 flags;
29	bool is_periodic;
30	s64 period; 				/* unit: ns */
31	struct hrtimer timer;
32	u32    speaker_data_on;
33
34	struct mutex lock;
35	atomic_t reinject;
36	atomic_t pending; /* accumulated triggered timers */
37	atomic_t 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 kthread_work expired;
50};
51
52#define KVM_PIT_BASE_ADDRESS	    0x40
53#define KVM_SPEAKER_BASE_ADDRESS    0x61
54#define KVM_PIT_MEM_LENGTH	    4
55#define KVM_PIT_FREQ		    1193181
56#define KVM_MAX_PIT_INTR_INTERVAL   HZ / 100
57#define KVM_PIT_CHANNEL_MASK	    0x3
58
59struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags);
60void kvm_free_pit(struct kvm *kvm);
61
62void kvm_pit_load_count(struct kvm_pit *pit, int channel, u32 val,
63		int hpet_legacy_start);
64void kvm_pit_set_reinject(struct kvm_pit *pit, bool reinject);
65
66#endif