/*
 * c64cia1.c - Definitions for the first MOS6526 (CIA) chip in the C64
 * ($DC00).
 *
 * Written by
 *  Andre Fachat <fachat@physik.tu-chemnitz.de>
 *  Ettore Perazzoli <ettore@comm2000.it>
 *  Andreas Boose <viceteam@t-online.de>
 *
 * DTV sections written by
 *  Hannu Nuotio <hannu.nuotio@tut.fi>
 *
 * This file is part of VICE, the Versatile Commodore Emulator.
 * See README for copyright notice.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
 *  02111-1307  USA.
 * */

#include "vice.h"

#include <stdio.h>

#include "c64.h"
#include "c64cia.h"
#include "cia.h"
#include "interrupt.h"
#include "joyport.h"
#include "joystick.h"
#include "keyboard.h"
#include "lib.h"
#include "log.h"
#include "maincpu.h"
#include "types.h"
#include "vicii.h"

#include "c64dtv-resources.h"
#include "hummeradc.h"

void cia1_store(uint16_t addr, uint8_t data)
{
    ciacore_store(machine_context.cia1, addr, data);
}

uint8_t cia1_read(uint16_t addr)
{
    /* disable TOD & serial */
    if (((addr & 0xf) >= 8) && ((addr & 0xf) <= 0xc)) {
        return 0xff;
    }

    return ciacore_read(machine_context.cia1, addr);
}

uint8_t cia1_peek(uint16_t addr)
{
    return ciacore_peek(machine_context.cia1, addr);
}

static void cia_set_int_clk(cia_context_t *cia_context, int value, CLOCK clk)
{
    interrupt_set_irq(maincpu_int_status, cia_context->int_num, value, clk);
}

static void cia_restore_int(cia_context_t *cia_context, int value)
{
    interrupt_restore_irq(maincpu_int_status, cia_context->int_num, value);
}

/*************************************************************************
 * I/O
 */

void cia1_set_extended_keyboard_rows_mask(uint8_t value)
{
}

static void pulse_ciapc(cia_context_t *cia_context, CLOCK rclk)
{
}

static void pre_store(void)
{
    vicii_handle_pending_alarms_external_write();
}

static void pre_read(void)
{
    vicii_handle_pending_alarms_external(0);
}

static void pre_peek(void)
{
    vicii_handle_pending_alarms_external(0);
}

static void do_reset_cia(cia_context_t *cia_context)
{
}

static void store_ciapa(cia_context_t *cia_context, CLOCK rclk, uint8_t b)
{
    unsigned int i, m;

    for (m = 0x1, i = 0; i < 8; m <<= 1, i++) {
        if ((keyarr[i] & 0x10) && (!(b & m))) {
            vicii_trigger_light_pen(maincpu_clk);
        }
    }
    store_joyport_dig(JOYPORT_2, b, 0xff);
}

static void undump_ciapa(cia_context_t *cia_context, CLOCK rclk, uint8_t b)
{
}

static void store_ciapb(cia_context_t *cia_context, CLOCK rclk, uint8_t byte)
{
    /* Falling edge triggers light pen.  */
    if ((byte ^ 0x10) & cia_context->old_pb & 0x10) {
        vicii_trigger_light_pen(rclk);
    }
    store_joyport_dig(JOYPORT_1, byte, 0xff);
}

static void undump_ciapb(cia_context_t *cia_context, CLOCK rclk, uint8_t byte)
{
}

static uint8_t read_ciapa(cia_context_t *cia_context)
{
    uint8_t byte;
    uint8_t val = 0xff;
    uint8_t msk;
    uint8_t m;
    int i;

    msk = cia_context->old_pb & read_joyport_dig(JOYPORT_1);

    for (m = 0x1, i = 0; i < 8; m <<= 1, i++) {
        if (!(msk & m)) {
            val &= ~rev_keyarr[i];
        }
    }

    byte = (val & (cia_context->c_cia[CIA_PRA]
                   | ~(cia_context->c_cia[CIA_DDRA]))) & read_joyport_dig(JOYPORT_2);

    return byte;
}

static uint8_t read_ciapb(cia_context_t *cia_context)
{
    uint8_t byte;
    uint8_t val = 0xff;
    uint8_t msk;
    uint8_t m;
    int i;
    uint16_t joyport_3_joystick_value;

    msk = cia_context->old_pa & read_joyport_dig(JOYPORT_2);

    for (m = 0x1, i = 0; i < 8; m <<= 1, i++) {
        if (!(msk & m)) {
            val &= ~keyarr[i];
        }
    }

    if (c64dtv_hummer_adc_enabled && (!(msk & 1))) {
        joyport_3_joystick_value = get_joystick_value(JOYPORT_3);
        val &= ~((uint8_t)joyport_3_joystick_value & 3);
    }

    byte = (val & (cia_context->c_cia[CIA_PRB]
                   | ~(cia_context->c_cia[CIA_DDRB]))) & read_joyport_dig(JOYPORT_1);

    return byte;
}

static void read_ciaicr(cia_context_t *cia_context)
{
}

static void read_sdr(cia_context_t *cia_context)
{
}

static void store_sdr(cia_context_t *cia_context, uint8_t byte)
{
}

/* dummy function for c64keyboard.c */
void cia1_check_lightpen(void)
{
}

void cia1_init(cia_context_t *cia_context)
{
    ciacore_init(machine_context.cia1, maincpu_alarm_context,
                 maincpu_int_status);
}

void cia1_set_timing(cia_context_t *cia_context, int tickspersec, int powerfreq)
{
    cia_context->power_freq = powerfreq;
    cia_context->ticks_per_sec = tickspersec;
    cia_context->todticks = 0;
    cia_context->power_tickcounter = 0;
    cia_context->power_ticks = 0;
}

void cia1_setup_context(machine_context_t *machine_ctx)
{
    cia_context_t *cia;

    machine_ctx->cia1 = lib_calloc(1, sizeof(cia_context_t));
    cia = machine_ctx->cia1;

    cia->prv = NULL;
    cia->context = NULL;

    cia->rmw_flag = &maincpu_rmw_flag;
    cia->clk_ptr = &maincpu_clk;

    cia1_set_timing(cia, C64_PAL_CYCLES_PER_SEC, 0);

    ciacore_setup_context(cia);

    cia->debugFlag = 0;
    cia->irq_line = IK_IRQ;
    cia->myname = lib_msprintf("CIA1");

    cia->undump_ciapa = undump_ciapa;
    cia->undump_ciapb = undump_ciapb;
    cia->store_ciapa = store_ciapa;
    cia->store_ciapb = store_ciapb;
    cia->store_sdr = store_sdr;
    cia->read_ciapa = read_ciapa;
    cia->read_ciapb = read_ciapb;
    cia->read_ciaicr = read_ciaicr;
    cia->read_sdr = read_sdr;
    cia->cia_set_int_clk = cia_set_int_clk;
    cia->cia_restore_int = cia_restore_int;
    cia->do_reset_cia = do_reset_cia;
    cia->pulse_ciapc = pulse_ciapc;
    cia->pre_store = pre_store;
    cia->pre_read = pre_read;
    cia->pre_peek = pre_peek;
}
