1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */ 2*4882a593Smuzhiyun #ifndef __I8254_H 3*4882a593Smuzhiyun #define __I8254_H 4*4882a593Smuzhiyun 5*4882a593Smuzhiyun #include <linux/kthread.h> 6*4882a593Smuzhiyun 7*4882a593Smuzhiyun #include <kvm/iodev.h> 8*4882a593Smuzhiyun 9*4882a593Smuzhiyun struct kvm_kpit_channel_state { 10*4882a593Smuzhiyun u32 count; /* can be 65536 */ 11*4882a593Smuzhiyun u16 latched_count; 12*4882a593Smuzhiyun u8 count_latched; 13*4882a593Smuzhiyun u8 status_latched; 14*4882a593Smuzhiyun u8 status; 15*4882a593Smuzhiyun u8 read_state; 16*4882a593Smuzhiyun u8 write_state; 17*4882a593Smuzhiyun u8 write_latch; 18*4882a593Smuzhiyun u8 rw_mode; 19*4882a593Smuzhiyun u8 mode; 20*4882a593Smuzhiyun u8 bcd; /* not supported */ 21*4882a593Smuzhiyun u8 gate; /* timer start */ 22*4882a593Smuzhiyun ktime_t count_load_time; 23*4882a593Smuzhiyun }; 24*4882a593Smuzhiyun 25*4882a593Smuzhiyun struct kvm_kpit_state { 26*4882a593Smuzhiyun /* All members before "struct mutex lock" are protected by the lock. */ 27*4882a593Smuzhiyun struct kvm_kpit_channel_state channels[3]; 28*4882a593Smuzhiyun u32 flags; 29*4882a593Smuzhiyun bool is_periodic; 30*4882a593Smuzhiyun s64 period; /* unit: ns */ 31*4882a593Smuzhiyun struct hrtimer timer; 32*4882a593Smuzhiyun u32 speaker_data_on; 33*4882a593Smuzhiyun 34*4882a593Smuzhiyun struct mutex lock; 35*4882a593Smuzhiyun atomic_t reinject; 36*4882a593Smuzhiyun atomic_t pending; /* accumulated triggered timers */ 37*4882a593Smuzhiyun atomic_t irq_ack; 38*4882a593Smuzhiyun struct kvm_irq_ack_notifier irq_ack_notifier; 39*4882a593Smuzhiyun }; 40*4882a593Smuzhiyun 41*4882a593Smuzhiyun struct kvm_pit { 42*4882a593Smuzhiyun struct kvm_io_device dev; 43*4882a593Smuzhiyun struct kvm_io_device speaker_dev; 44*4882a593Smuzhiyun struct kvm *kvm; 45*4882a593Smuzhiyun struct kvm_kpit_state pit_state; 46*4882a593Smuzhiyun int irq_source_id; 47*4882a593Smuzhiyun struct kvm_irq_mask_notifier mask_notifier; 48*4882a593Smuzhiyun struct kthread_worker *worker; 49*4882a593Smuzhiyun struct kthread_work expired; 50*4882a593Smuzhiyun }; 51*4882a593Smuzhiyun 52*4882a593Smuzhiyun #define KVM_PIT_BASE_ADDRESS 0x40 53*4882a593Smuzhiyun #define KVM_SPEAKER_BASE_ADDRESS 0x61 54*4882a593Smuzhiyun #define KVM_PIT_MEM_LENGTH 4 55*4882a593Smuzhiyun #define KVM_PIT_FREQ 1193181 56*4882a593Smuzhiyun #define KVM_MAX_PIT_INTR_INTERVAL HZ / 100 57*4882a593Smuzhiyun #define KVM_PIT_CHANNEL_MASK 0x3 58*4882a593Smuzhiyun 59*4882a593Smuzhiyun struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags); 60*4882a593Smuzhiyun void kvm_free_pit(struct kvm *kvm); 61*4882a593Smuzhiyun 62*4882a593Smuzhiyun void kvm_pit_load_count(struct kvm_pit *pit, int channel, u32 val, 63*4882a593Smuzhiyun int hpet_legacy_start); 64*4882a593Smuzhiyun void kvm_pit_set_reinject(struct kvm_pit *pit, bool reinject); 65*4882a593Smuzhiyun 66*4882a593Smuzhiyun #endif 67