/*
 * wnix, a Unix-like operating system for WebAssembly applications.
 * Copyright (C) 2025  Xavier Del Campo Romero
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

#ifndef DRV_PS1_DMA_H
#define DRV_PS1_DMA_H

#include <stdint.h>

union dpcr
{
    struct
    {
        uint32_t mdecin_prio :3, mdecin_en :1, mdecout_prio :3, mdecout_en :1,
            gpu_prio :3, gpu_en :1, cdrom_prio :3, cdrom_en :1, spu_prio :3,
            spu_en :1, pio_prio :3, pio_en :1, otc_prio :3, otc_en :1, :4;
    } bits;

    uint32_t mask;
};

union madr
{
    struct
    {
        uint32_t addr :24, :8;
    } bits;

    uint32_t mask;
};

union bcr
{
    struct
    {
        uint16_t nwords, reserved;
    } syncmode_0;

    struct
    {
        uint16_t blocksz, nblocks;
    } syncmode_1;

    struct
    {
        uint32_t reserved;
    } syncmode_2;

    uint32_t mask;
};

enum
{
    CHCR_DIR_TO_RAM,
    CHCR_DIR_FROM_RAM
};

enum
{
    CHCR_SYNC_MODE_ALL,
    CHCR_SYNC_MODE_BLOCKS,
    CHCR_SYNC_MODE_LINKED_LIST
};

union chcr
{
    struct
    {
        uint32_t dir :1, memstep :1, :6, chopping :1, sync_mode :2, :5,
            chopping_dma_window_sz :3, :1, chopping_cpu_window_sz :3, :1,
            start_busy :1, :3, start_trigger :1, :3;
    } bits;

    uint32_t mask;
};

#define DMA_BASE(dma, off) ((dma) * 0x10 + 0x1f801080 + (off))
#define D2_MADR ((volatile union madr *)DMA_BASE(2, 0))
#define D2_BCR ((volatile union bcr *)DMA_BASE(2, 4))
#define D2_CHCR ((volatile union chcr *)DMA_BASE(2, 8))
#define DPCR ((volatile union dpcr *)0x1f8010f0)

#endif
