// SPDX-License-Identifier: MIT
//
// boot/vera.h
//      Defines for the VERA chip
//
// Copyright © 2024 Kyle J Cardoza <Kyle.Cardoza@icloud.com>

#ifdef __CALYPSI_CC__
#include <stddef.h>
#include <stdint.h>
#endif

#define AUTO_NONE  0x000000
#define AUTO_INC_1  0x100000
#define AUTO_INC_2  0x200000
#define AUTO_INC_4  0x300000
#define AUTO_INC_8  0x400000
#define AUTO_INC_16  0x500000
#define AUTO_INC_32  0x600000
#define AUTO_INC_64  0x700000
#define AUTO_INC_128  0x800000
#define AUTO_INC_256  0x900000
#define AUTO_INC_512  0xA00000
#define AUTO_INC_40  0xB00000
#define AUTO_INC_80  0xC00000
#define AUTO_INC_160  0xD00000
#define AUTO_INC_320  0xE00000
#define AUTO_INC_640  0xF00000

#define DISABLED 0
#define ENABLED 1

#define VERA_L_BPP1  0b00000000
#define VERA_L_BPP2  0b00000001
#define VERA_L_BPP4  0b00000010
#define VERA_L_BPP8  0b00000011

#define VERA_L_BITMAP  0b00000100
#define VERA_L_T256C  0b00001000

#define VERA_L_32W  0b00000000
#define VERA_L_64W  0b00010000
#define VERA_L_128W  0b00100000
#define VERA_L_256W  0b00110000

#define VERA_L_32H  0b00000000
#define VERA_L_64H  0b01000000
#define VERA_L_128H  0b10000000
#define VERA_L_256H  0b11000000

#define VERA_TILESIZE8x8  0b00000000
#define VERA_TILESIZE16x8  0b00000001
#define VERA_TILESIZE8x16  0b00000010
#define VERA_TILESIZE16x16  0b00000011

// The base address of the VERA chip
#define VERA_BASE  0x00DF00

// Offsets (relative to VERA_BASE) for each VERA register

#define VERA_ADDRx_L VERA_BASE + 00
#define VERA_ADDRx_M VERA_BASE + 01
#define VERA_ADDRx_H VERA_BASE + 02

// Accssible with ADDRSEL 0
#define VERA_ADDR0_L VERA_BASE + 00
#define VERA_ADDR0_M VERA_BASE + 01
#define VERA_ADDR0_H VERA_BASE + 02

// Accssible with ADDRSEL 1
#define VERA_ADDR1_L VERA_BASE + 00
#define VERA_ADDR1_M VERA_BASE + 01
#define VERA_ADDR1_H VERA_BASE + 02

#define VERA_DATA_0 VERA_BASE +  0x03
#define VERA_DATA_1 VERA_BASE +  0x04

#define VERA_CTRL VERA_BASE +  0x05
#define VERA_IEN VERA_BASE +  0x06
#define VERA_ISR VERA_BASE +  0x07
#define VERA_IRQLINE_L VERA_BASE +  0x08
#define VERA_SCANLINE_L VERA_BASE +  0x08

// Accssible with DCSEL 0
#define VERA_DC_VIDEO VERA_BASE +  0x09
#define VERA_DC_HSCALE VERA_BASE +  0x0A
#define VERA_DC_VSCALE VERA_BASE +  0x0B
#define VERA_DC_BORDER VERA_BASE +  0x0C

// Accssible with DCSEL 1
#define VERA_DC_HSTART VERA_BASE +  0x09
#define VERA_DC_HSTOP VERA_BASE +  0x0A
#define VERA_DC_VSTART VERA_BASE +  0x0B
#define VERA_DC_VSTOP VERA_BASE +  0x0C

// Layer 0
#define VERA_L0_CONFIG VERA_BASE +  0x0D
#define VERA_L0_MAPBASE VERA_BASE +  0x0E
#define VERA_L0_TILEBASE VERA_BASE +  0x0F
#define VERA_L0_HSCROLL_L VERA_BASE +  0x10
#define VERA_L0_HSCROLL_H VERA_BASE +  0x11
#define VERA_L0_VSCROLL_L VERA_BASE +  0x12
#define VERA_L0_VSCROLL_H VERA_BASE +  0x13

// Layer 1
#define VERA_L1_CONFIG VERA_BASE +  0x14
#define VERA_L1_MAPBASE VERA_BASE +  0x15
#define VERA_L1_TILEBASE VERA_BASE +  0x16
#define VERA_L1_HSCROLL_L VERA_BASE +  0x17
#define VERA_L1_HSCROLL_H VERA_BASE +  0x18
#define VERA_L1_VSCROLL_L VERA_BASE +  0x19
#define VERA_L1_VSCROLL_H VERA_BASE +  0x1A

// Audio
#define VERA_AUDIO_CTRL VERA_BASE +  0x1B
#define VERA_AUDIO_RATE VERA_BASE +  0x1C
#define VERA_AUDIO_DATA VERA_BASE +  0x1D

// SPI (Unused in prototype four!)
#define VERA_SPI_DATA VERA_BASE +  0x1E
#define VERA_SPI_CTRL VERA_BASE +  0x1F

// VRAM layout
#define TEXT_CONSOLE_TILES  0x000800
#define TEXT_CONSOLE0_VRAM  0x001800 // Runs up to  0x5800
#define TEXT_CONSOLE_SPRITE_BITMAPS  0x005800
#define VERA_PSG_BASE  0x01F9C0
#define VERA_PALETTE_BASE  0x01FA00
#define VERA_SPRITE_ATTR_BASE  0x01FC00

// The assembler can't handle this stuff.
#ifdef __CALYPSI_CC__

uint8_t vera_reg_get(uint8_t reg);

void vera_reg_set(uint8_t reg, uint8_t value);

void vera_reset(void);

void vera_mem_read(void *dest, uint32_t src, size_t length);

void vera_mem_write(uint32_t dest, void *src, size_t length);

void vera_mem_set(uint32_t dest, uint8_t value, size_t length);

#endif