[linux-block.git] / arch / x86 / kvm / i8254.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __I8254_H
#define __I8254_H

#include <linux/kthread.h>

#include <kvm/iodev.h>

struct kvm_kpit_channel_state {
	u32 count; /* can be 65536 */
	u16 latched_count;
	u8 count_latched;
	u8 status_latched;
	u8 status;
	u8 read_state;
	u8 write_state;
	u8 write_latch;
	u8 rw_mode;
	u8 mode;
	u8 bcd; /* not supported */
	u8 gate; /* timer start */
	ktime_t count_load_time;
};

struct kvm_kpit_state {
	/* All members before "struct mutex lock" are protected by the lock. */
	struct kvm_kpit_channel_state channels[3];
	u32 flags;
	bool is_periodic;
	s64 period; 				/* unit: ns */
	struct hrtimer timer;

	struct mutex lock;
	atomic_t reinject;
	atomic_t pending; /* accumulated triggered timers */
	atomic_t irq_ack;
	struct kvm_irq_ack_notifier irq_ack_notifier;
};

struct kvm_pit {
	struct kvm_io_device dev;
	struct kvm_io_device speaker_dev;
	struct kvm *kvm;
	struct kvm_kpit_state pit_state;
	int irq_source_id;
	struct kvm_irq_mask_notifier mask_notifier;
	struct kthread_worker *worker;
	struct kthread_work expired;
};

#define KVM_PIT_BASE_ADDRESS	    0x40
#define KVM_SPEAKER_BASE_ADDRESS    0x61
#define KVM_PIT_MEM_LENGTH	    4
#define KVM_PIT_FREQ		    1193181
#define KVM_MAX_PIT_INTR_INTERVAL   HZ / 100
#define KVM_PIT_CHANNEL_MASK	    0x3

struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags);
void kvm_free_pit(struct kvm *kvm);

void kvm_pit_load_count(struct kvm_pit *pit, int channel, u32 val,
		int hpet_legacy_start);
void kvm_pit_set_reinject(struct kvm_pit *pit, bool reinject);

#endif
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
7837699f SY	2	#ifndef __I8254_H
	3	#define __I8254_H
	4
b6ddf05f JK	5	#include <linux/kthread.h>
b6ddf05f JK	6
af669ac6	7	#include <kvm/iodev.h>
7837699f	8
7837699f SY	9	struct 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
	25	struct kvm_kpit_state {
b39c90b6	26	/* All members before "struct mutex lock" are protected by the lock. */
7837699f	27	struct kvm_kpit_channel_state channels[3];
e9f42757	28	u32 flags;
d3c7b77d	29	bool is_periodic;
26ef1924 AK	30	s64 period; /* unit: ns */
26ef1924 AK	31	struct hrtimer timer;
b39c90b6	32
7837699f	33	struct mutex lock;
a0aace5a	34	atomic_t reinject;
b39c90b6	35	atomic_t pending; /* accumulated triggered timers */
ddf54503	36	atomic_t irq_ack;
3cf57fed	37	struct kvm_irq_ack_notifier irq_ack_notifier;
7837699f SY	38	};
	39
	40	struct kvm_pit {
7837699f SY	41	struct kvm_io_device dev;
	42	struct kvm_io_device speaker_dev;
	43	struct kvm *kvm;
	44	struct kvm_kpit_state pit_state;
5550af4d	45	int irq_source_id;
4780c659	46	struct kvm_irq_mask_notifier mask_notifier;
36da91bd	47	struct kthread_worker *worker;
b6ddf05f	48	struct kthread_work expired;
7837699f SY	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
c5ff41ce	58	struct kvm_pit kvm_create_pit(struct kvm kvm, u32 flags);
7837699f	59	void kvm_free_pit(struct kvm *kvm);
09edea72	60
09edea72 RK	61	void kvm_pit_load_count(struct kvm_pit *pit, int channel, u32 val,
09edea72 RK	62	int hpet_legacy_start);
71474e2f	63	void kvm_pit_set_reinject(struct kvm_pit *pit, bool reinject);
7837699f SY	64
7837699f SY	65	#endif