/*
 * 86Box	A hypervisor and IBM PC system emulator that specializes in
 *		running old operating systems and software designed for IBM
 *		PC systems and compatibles from 1981 through fairly recent
 *		system designs based on the PCI bus.
 *
 *		This file is part of the 86Box distribution.
 *
 *		Header of the implementation of the Intel 8253/8254
 *		Programmable Interval Timer.
 *
 *
 *
 * Author:	Miran Grca, <mgrca8@gmail.com>
 *		Copyright 2019,2020 Miran Grca.
 */
#ifndef EMU_PIT_H
# define EMU_PIT_H


typedef struct {
    uint8_t	m, ctrl,
		read_status, latch,
		s1_det, l_det,
		bcd, pad;

    uint16_t	rl;

    int		rm, wm, gate, out,
		newcount, clock, using_timer, latched,
		state, null_count, do_read_status;

    union {
		int	count;
		struct {
			int	units		:4;
			int	tens		:4;
			int	hundreds	:4;
			int	thousands	:4;
			int	myriads		:4;
		};
    };

    uint32_t	l;

    void	(*load_func)(uint8_t new_m, int new_count);
    void	(*out_func)(int new_out, int old_out);
} ctr_t;


typedef struct PIT {
    int		flags, clock;
    pc_timer_t	callback_timer;

    ctr_t	counters[3];

    uint8_t	ctrl;
} pit_t;


extern pit_t	*pit,
		*pit2;

extern double	SYSCLK, PCICLK, AGPCLK;

extern uint64_t	PITCONST, ISACONST,
		CGACONST,
		MDACONST,
		HERCCONST,
		VGACONST1,
		VGACONST2,
		RTCCONST, ACPICONST;

extern int	refresh_at_enable;


/* Gets a counter's count. */
extern uint16_t	pit_ctr_get_count(ctr_t *ctr);
/* Sets a counter's load count handler. */
extern void	pit_ctr_set_load_func(ctr_t *ctr, void (*func)(uint8_t new_m, int new_count));
/* Sets a counter's OUT output handler. */
extern void	pit_ctr_set_out_func(ctr_t *ctr, void (*func)(int new_out, int old_out));
/* Sets a counter's GATE input. */
extern void	pit_ctr_set_gate(ctr_t *ctr, int gate);
/* Sets a counter's CLOCK input. */
extern void	pit_ctr_set_clock(ctr_t *ctr, int clock);
/* Sets if a counter's CLOCK input is from the timer or not - used by PCjr. */
extern void	pit_ctr_set_using_timer(ctr_t *ctr, int using_timer);

extern pit_t *	pit_common_init(int type, void (*out0)(int new_out, int old_out), void (*out1)(int new_out, int old_out));
extern pit_t *	pit_ps2_init(void);
extern void	pit_reset(pit_t *dev);

extern void	pit_irq0_timer(int new_out, int old_out);
extern void	pit_irq0_timer_pcjr(int new_out, int old_out);
extern void	pit_irq0_timer_ps2(int new_out, int old_out);

extern void	pit_refresh_timer_xt(int new_out, int old_out);
extern void	pit_refresh_timer_at(int new_out, int old_out);

extern void	pit_speaker_timer(int new_out, int old_out);

extern void	pit_nmi_timer_ps2(int new_out, int old_out);

extern void     pit_set_clock(int clock);
extern void	pit_handler(int set, uint16_t base, int size, void *priv);


#ifdef EMU_DEVICE_H
extern const device_t	i8253_device;
extern const device_t	i8254_device;
extern const device_t	i8254_sec_device;
extern const device_t	i8254_ext_io_device;
extern const device_t	i8254_ps2_device;
#endif


#endif	/*EMU_PIT_H*/