nuclear@0: #ifndef VDP_H_
nuclear@0: #define VDP_H_
nuclear@0: 
nuclear@0: #include <stdint.h>
nuclear@0: 
nuclear@0: #define VDP_PORT_DATA		*((volatile uint16_t*)0xc00000)
nuclear@0: #define VDP_PORT_DATA32		*((volatile uint32_t*)0xc00000)
nuclear@0: #define VDP_PORT_CTL		*((volatile uint16_t*)0xc00004)
nuclear@0: #define VDP_PORT_CTL32		*((volatile uint32_t*)0xc00004)
nuclear@0: #define VDP_PORT_HVCNT		*((volatile uint16_t*)0xc00008)
nuclear@0: #define VDP_PORT_PSG		*((volatile uint16_t*)0xc00010)
nuclear@0: 
nuclear@0: #define VDP_PORT_STATUS		*((volatile uint16_t*)0xc00004)
nuclear@0: 
nuclear@0: enum {
nuclear@0: 	VDP_REG_MODE1			= 0,
nuclear@0: 	VDP_REG_MODE2			= 1,
nuclear@0: 	VDP_REG_NAMETAB_A		= 2,
nuclear@0: 	VDP_REG_NAMETAB_WIN		= 3,
nuclear@0: 	VDP_REG_NAMETAB_B		= 4,
nuclear@0: 	VDP_REG_SPRITE_TAB		= 5,
nuclear@0: 	VDP_REG_BGCOL			= 7,
nuclear@1: 	VDP_REG_HINTR			= 10,
nuclear@0: 	VDP_REG_MODE3			= 11,
nuclear@0: 	VDP_REG_MODE4			= 12,
nuclear@0: 	VDP_REG_SCROLL_TAB		= 13,
nuclear@0: 	VDP_REG_AUTOINC			= 15,
nuclear@0: 	VDP_REG_SCROLL_SIZE		= 16,
nuclear@0: 	VDP_REG_WIN_XPOS		= 17,
nuclear@0: 	VDP_REG_WIN_YPOS		= 18,
nuclear@0: 	VDP_REG_DMA_LEN_LOW		= 19,
nuclear@0: 	VDP_REG_DMA_LEN_HIGH	= 20,
nuclear@0: 	VDP_REG_DMA_SRC_LOW		= 21,
nuclear@0: 	VDP_REG_DMA_SRC_MID		= 22,
nuclear@0: 	VDP_REG_DMA_SRC_HIGH	= 23,
nuclear@0: 
nuclear@0: 	VDP_NUM_REGS
nuclear@0: };
nuclear@0: 
nuclear@0: uint16_t vdp_reg_shadow[VDP_NUM_REGS];
nuclear@0: 
nuclear@0: /* access VDP memory */
nuclear@0: enum { VDP_MEM_READ, VDP_MEM_WRITE };
nuclear@0: enum {
nuclear@0: 	VDP_MEM_VRAM	= 0,
nuclear@0: 	VDP_MEM_CRAM	= 0xa,	/* CD5->CD0: 0 0 r 0 w 0 */
nuclear@0: 	VDP_MEM_VSRAM	= 4		/* CD5->CD0: 0 0 0 1 0 0 */
nuclear@0: };
nuclear@0: 
nuclear@0: static inline void vdp_setup_access(uint16_t addr, int rw, int memid)
nuclear@0: {
nuclear@0: 	uint32_t type;
nuclear@0: 	if(rw == VDP_MEM_WRITE) {
nuclear@0: 		type = (memid & 7) | 1;
nuclear@0: 	} else {
nuclear@0: 		type = memid & 0xc;
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	VDP_PORT_CTL32 = (((uint32_t)addr & 0x3fff) << 16) | ((addr >> 14) & 3) |
nuclear@0: 		((type << 2) & 0xf0) | (type << 30);
nuclear@0: }
nuclear@0: 
nuclear@0: 
nuclear@0: /* mode register 1 */
nuclear@0: enum {
nuclear@0: 	VDP_MODE1_BASE	= 0x4,
nuclear@0: 	VDP_MODE1_HVCNT = 0x2,
nuclear@0: 	VDP_MODE1_HINTR = 0x10
nuclear@0: };
nuclear@0: 
nuclear@0: /* mode register 2 */
nuclear@0: enum {
nuclear@0: 	VDP_MODE2_BASE		= 0x4,
nuclear@0: 	VDP_MODE2_V30CELL	= 0x8,
nuclear@0: 	VDP_MODE2_DMA		= 0x10,
nuclear@0: 	VDP_MODE2_VINTR		= 0x20,
nuclear@0: 	VDP_MODE2_DISP		= 0x40
nuclear@0: };
nuclear@0: 
nuclear@0: /* mode register 3 */
nuclear@0: enum {
nuclear@0: 	VDP_MODE3_BASE			= 0,
nuclear@0: 	VDP_MODE3_HSCROLL_CELL	= 2,
nuclear@0: 	VDP_MODE3_HSCROLL_LINE	= 3,
nuclear@0: 	VDP_MODE3_VSCROLL_2CELL	= 4,
nuclear@0: 	VDP_MODE3_EXTINTR		= 8
nuclear@0: };
nuclear@0: 
nuclear@0: /* mode register 4 */
nuclear@0: enum {
nuclear@0: 	VDP_MODE4_BASE			= 0,
nuclear@0: 	VDP_MODE4_H40CELL		= 0x81,
nuclear@0: 	VDP_MODE4_ILACE			= 2,
nuclear@0: 	VDP_MODE4_ILACE_2XRES	= 6,
nuclear@0: 	VDP_MODE4_SH			= 8	/* shadow/highlight enable */
nuclear@0: };
nuclear@0: 
nuclear@0: /* scroll size register */
nuclear@0: enum {
nuclear@0: 	VDP_SCROLL_H32		= 0,
nuclear@0: 	VDP_SCROLL_H64		= 1,
nuclear@0: 	VDP_SCROLL_H128		= 3,
nuclear@0: 	VDP_SCROLL_V32		= 0,
nuclear@0: 	VDP_SCROLL_V64		= 0x10,
nuclear@0: 	VDP_SCROLL_V128		= 0x30
nuclear@0: };
nuclear@0: 
nuclear@0: /* window X/Y position register */
nuclear@0: enum {
nuclear@0: 	VDP_WIN_LEFT	= 0,
nuclear@0: 	VDP_WIN_UP		= 0,
nuclear@0: 	VDP_WIN_RIGHT	= 0x80,
nuclear@0: 	VDP_WIN_DOWN	= 0x80,
nuclear@0: 	VDP_WIN_POSMASK	= 0x1f
nuclear@0: };
nuclear@0: 
nuclear@0: #define VDP_PACK_RGB(r, g, b)	\
nuclear@0: 	((((uint16_t)(r) & 7) << 1) | (((uint16_t)(g) & 7) << 5) | (((uint16_t)(b) & 7) << 9))
nuclear@0: 
nuclear@0: 
nuclear@0: static inline void vdp_setreg(int reg, uint8_t value)
nuclear@0: {
nuclear@1: 	vdp_reg_shadow[reg] = value;
nuclear@0: 	VDP_PORT_CTL = (uint16_t)value | (reg << 8) | (uint16_t)0x8000;
nuclear@0: }
nuclear@0: 
nuclear@0: static inline uint16_t vdp_getreg(int reg)
nuclear@0: {
nuclear@0: 	return vdp_reg_shadow[reg];
nuclear@0: }
nuclear@0: 
nuclear@0: static inline uint16_t vdp_status(void)
nuclear@0: {
nuclear@0: 	return VDP_PORT_CTL;
nuclear@0: }
nuclear@0: 
nuclear@0: static inline void vdp_set_bgcolor(int palidx, int colidx)
nuclear@0: {
nuclear@0: 	vdp_setreg(VDP_REG_BGCOL, (colidx & 0xf) | (palidx << 4));
nuclear@0: }
nuclear@0: 
nuclear@0: static inline void vdp_set_autoinc(int stride)
nuclear@0: {
nuclear@0: 	vdp_setreg(VDP_REG_AUTOINC, stride);
nuclear@0: }
nuclear@0: 
nuclear@0: static inline void vdp_set_pal_entry(int pidx, int cidx, int r, int g, int b)
nuclear@0: {
nuclear@0: 	uint16_t paddr = (pidx << 5) | (cidx << 1);
nuclear@0: 
nuclear@0: 	vdp_setup_access(paddr, VDP_MEM_WRITE, VDP_MEM_CRAM);
nuclear@0: 	VDP_PORT_DATA = VDP_PACK_RGB(r, g, b);
nuclear@0: }
nuclear@0: 
nuclear@1: static inline void vdp_enable_vintr(void)
nuclear@1: {
nuclear@1: 	vdp_setreg(VDP_REG_MODE2, vdp_getreg(VDP_REG_MODE2) | VDP_MODE2_VINTR);
nuclear@1: }
nuclear@1: 
nuclear@1: static inline void vdp_disable_vintr(void)
nuclear@1: {
nuclear@1: 	vdp_setreg(VDP_REG_MODE2, vdp_getreg(VDP_REG_MODE2) & ~VDP_MODE2_VINTR);
nuclear@1: }
nuclear@1: 
nuclear@1: static inline void vdp_enable_hintr(int counter)
nuclear@1: {
nuclear@1: 	vdp_setreg(VDP_REG_HINTR, counter);
nuclear@1: 	vdp_setreg(VDP_REG_MODE1, vdp_getreg(VDP_REG_MODE1) | VDP_MODE1_HINTR);
nuclear@1: }
nuclear@1: 
nuclear@1: static inline void vdp_disable_hintr(void)
nuclear@1: {
nuclear@1: 	vdp_setreg(VDP_REG_MODE1, vdp_getreg(VDP_REG_MODE1) & ~VDP_MODE1_HINTR);
nuclear@1: }
nuclear@1: 
nuclear@0: void vdp_init(void);
nuclear@0: 
nuclear@0: #endif	/* VDP_H_ */