/***** dma.h *********************************************************
 * (c) 2010 CTA Systems Inc. All rights reserved. Glory To God       *
 *                                                                   *
 *         Direct Memory Access (DMA) Routines                       *
 *         ===================================                       *
 *                                                                   *
 ************************************************************ cta os */

#ifndef __DMA__H__
#define __DMA__H__

enum DMA_MODE_REG_MASK {
    DMAModeMaskSelect = 3,

    DMAModeMaskTra = 0xc,
    DMAModeSelfTest = 0,
    DMAModeReadTransfer = 4,
    DMAModeWriteTransfer = 8,

    DMAModeMaskAuto = 0x10,
    DMAModeMaskIdec = 0x20,

    DMAModeMask = 0xc0,
    DMAModeTransferOnDemand = 0,
    DMAModeTransferSingle = 0x40,
    DMAModeTransferBlock = 0x80,
    DMAModeTransferCascade = 0xC0
};

extern void DMASetAddress(unsigned short channel, unsigned char low, unsigned char high);
extern void DMASetCount (unsigned short channel, unsigned char low, unsigned char high);
extern void DMASetExternalPageRegisters (unsigned char channel, unsigned char val);
extern void DMAMaskChannel (unsigned char channel);
extern void DMAUnmaskChannel (unsigned char channel);
extern void DMAUnmaskAll();
extern void DMAResetFlipFlop (unsigned char dma);
extern void DMAReset ();
extern void DMASetMode(unsigned char channel, unsigned char mode);
extern void DMASetRead (unsigned char channel);
extern void DMASetWrite (unsigned char channel);

#endif