timer.h

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/*
 * Copyright (c) 2025 Adrian "asie" Siekierka
 *
 * This software is provided 'as-is', without any express or implied
 * warranty. In no event will the authors be held liable for any damages
 * arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 *    claim that you wrote the original software. If you use this software
 *    in a product, an acknowledgment in the product documentation would be
 *    appreciated but is not required.
 *
 * 2. Altered source versions must be plainly marked as such, and must not be
 *    misrepresented as being the original software.
 *
 * 3. This notice may not be removed or altered from any source distribution.
 */
 
#ifndef LIBWS_TIMER_H_
#define LIBWS_TIMER_H_

 
#ifndef __ASSEMBLER__
#include <stdint.h>
#endif
#include <wonderful.h>
#include "ports.h"
#include "util.h"
#include "system.h"
#include "display.h"


#define WS_TIMER_HBLANK_HZ_TO_TICKS(hz) ((uint16_t) WS_HZ_TO_DIVIDER((hz), 12000))

#define WS_TIMER_VBLANK_HZ_TO_TICKS(hz) ((uint16_t) WS_HZ_TO_DIVIDER((hz), 12000 / (WS_DISPLAY_VTOTAL))))
 
#ifndef __ASSEMBLER__
 
static inline uint16_t ws_timer_hblank_get_counter(void) {
    return inportw(WS_TIMER_HBL_COUNTER_PORT);
}
 
static inline uint16_t ws_timer_vblank_get_counter(void) {
    return inportw(WS_TIMER_VBL_COUNTER_PORT);
}
 
static inline void ws_timer_hblank_disable(void) {
    outportb(WS_TIMER_CTRL_PORT, inportb(WS_TIMER_CTRL_PORT) & ~WS_TIMER_CTRL_HBL_MASK);
}
 
static inline void ws_timer_vblank_disable(void) {
    outportb(WS_TIMER_CTRL_PORT, inportb(WS_TIMER_CTRL_PORT) & ~WS_TIMER_CTRL_VBL_MASK);
}

static inline void ws_timer_hblank_start_once(uint16_t ticks) {
    outportw(WS_TIMER_HBL_RELOAD_PORT, ticks);
    outportb(WS_TIMER_CTRL_PORT, (inportb(WS_TIMER_CTRL_PORT) & ~WS_TIMER_CTRL_HBL_MASK) | WS_TIMER_CTRL_HBL_ONESHOT);
}

static inline void ws_timer_vblank_start_once(uint16_t ticks) {
    outportw(WS_TIMER_VBL_RELOAD_PORT, ticks);
    outportb(WS_TIMER_CTRL_PORT, (inportb(WS_TIMER_CTRL_PORT) & ~WS_TIMER_CTRL_VBL_MASK) | WS_TIMER_CTRL_VBL_ONESHOT);
}

static inline void ws_timer_hblank_start_repeat(uint16_t ticks) {
    outportw(WS_TIMER_HBL_RELOAD_PORT, ticks);
    outportb(WS_TIMER_CTRL_PORT, (inportb(WS_TIMER_CTRL_PORT) & ~WS_TIMER_CTRL_HBL_MASK) | WS_TIMER_CTRL_HBL_REPEAT);
}

static inline void ws_timer_vblank_start_repeat(uint16_t ticks) {
    outportw(WS_TIMER_VBL_RELOAD_PORT, ticks);
    outportb(WS_TIMER_CTRL_PORT, (inportb(WS_TIMER_CTRL_PORT) & ~WS_TIMER_CTRL_VBL_MASK) | WS_TIMER_CTRL_VBL_REPEAT);
}
 
#endif

 
#endif /* LIBWS_TIMER_H_ */