nuclear@0: /*
nuclear@0: Copyright 2004 John Tsiombikas <nuclear@siggraph.org>
nuclear@0: 
nuclear@0: This file is part of libgba, a library for GameBoy Advance development.
nuclear@0: 
nuclear@0: This program is free software; you can redistribute it and/or modify
nuclear@0: it under the terms of the GNU General Public License as published by
nuclear@0: the Free Software Foundation; either version 2 of the License, or
nuclear@0: (at your option) any later version.
nuclear@0: 
nuclear@0: This program is distributed in the hope that it will be useful,
nuclear@0: but WITHOUT ANY WARRANTY; without even the implied warranty of
nuclear@0: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
nuclear@0: GNU General Public License for more details.
nuclear@0: 
nuclear@0: You should have received a copy of the GNU General Public License
nuclear@0: along with this program; if not, write to the Free Software
nuclear@0: Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
nuclear@0: */
nuclear@0: 
nuclear@0: #include "libgba_config.h"
nuclear@0: #include "dma.h"
nuclear@0: 
nuclear@0: /* DMA Options */
nuclear@0: #define DMA_ENABLE 				0x80000000
nuclear@0: #define DMA_INT_ENABLE			0x40000000
nuclear@0: #define DMA_TIMING_IMMED		0x00000000
nuclear@0: #define DMA_TIMING_VBLANK		0x10000000
nuclear@0: #define DMA_TIMING_HBLANK		0x20000000
nuclear@0: #define DMA_TIMING_DISPSYNC		0x30000000
nuclear@0: #define DMA_16					0x00000000
nuclear@0: #define DMA_32					0x04000000
nuclear@0: #define DMA_REPEAT				0x02000000
nuclear@0: #define DMA_SRC_INC				0x00000000
nuclear@0: #define DMA_SRC_DEC				0x00800000
nuclear@0: #define DMA_SRC_FIX				0x01000000
nuclear@0: #define DMA_DST_INC				0x00000000
nuclear@0: #define DMA_DST_DEC				0x00200000
nuclear@0: #define DMA_DST_FIX1			0x00400000
nuclear@0: #define DMA_DST_RELOAD			0x00600000
nuclear@0: 
nuclear@0: /* DMA Register Parts */
nuclear@0: #define DMA_SRC		0
nuclear@0: #define DMA_DST		1
nuclear@0: #define DMA_CTRL	2
nuclear@0: 
nuclear@0: static volatile unsigned long *reg_dma[4] = {(void*)0x040000b0, (void*)0x040000bc, (void*)0x040000c8, (void*)0x040000d4 };
nuclear@0: 
nuclear@0: /* --- perform a copy of words or halfwords using DMA --- */
nuclear@0: 
nuclear@0: void dma_copy32(int channel, void *dst, void *src, int words) {
nuclear@0: 	reg_dma[channel][DMA_SRC] = (unsigned long)src;
nuclear@0: 	reg_dma[channel][DMA_DST] = (unsigned long)dst;
nuclear@0: 	reg_dma[channel][DMA_CTRL] = words | DMA_TIMING_IMMED | DMA_32 | DMA_ENABLE;
nuclear@0: }
nuclear@0: 
nuclear@0: void dma_copy16(int channel, void *dst, void *src, int halfwords) {
nuclear@0: 	reg_dma[channel][DMA_SRC] = (unsigned long)src;
nuclear@0: 	reg_dma[channel][DMA_DST] = (unsigned long)dst;
nuclear@0: 	reg_dma[channel][DMA_CTRL] = halfwords | DMA_TIMING_IMMED | DMA_16 | DMA_ENABLE;
nuclear@0: }
nuclear@0: 
nuclear@0: /* --- fill a buffer with an ammount of words and halfwords using DMA --- */
nuclear@0: 
nuclear@0: void dma_fill32(int channel, void *dst, unsigned long val, int words) {
nuclear@0: 	unsigned long valmem = val;
nuclear@0: 	reg_dma[channel][DMA_SRC] = (unsigned long)&valmem;
nuclear@0: 	reg_dma[channel][DMA_DST] = (unsigned long)dst;
nuclear@0: 	reg_dma[channel][DMA_CTRL] = words | DMA_SRC_FIX | DMA_TIMING_IMMED | DMA_32 | DMA_ENABLE;
nuclear@0: }
nuclear@0: 
nuclear@0: void dma_fill16(int channel, void *dst, unsigned short val, int halfwords) {
nuclear@0: 	unsigned short valmem = val;
nuclear@0: 	reg_dma[channel][DMA_SRC] = (unsigned long)&valmem;
nuclear@0: 	reg_dma[channel][DMA_DST] = (unsigned long)dst;
nuclear@0: 	reg_dma[channel][DMA_CTRL] = halfwords | DMA_SRC_FIX | DMA_TIMING_IMMED | DMA_16 | DMA_ENABLE;
nuclear@0: }