/***** 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 {
    DMA_MODE_MASK_SEL = 3,

    DMA_MODE_MASK_TRA = 0xc,
    DMA_MODE_SELF_TEST = 0,
    DMA_MODE_READ_TRANSFER = 4,
    DMA_MODE_WRITE_TRANSFER = 8,

    DMA_MODE_MASK_AUTO = 0x10,
    DMA_MODE_MASK_IDEC = 0x20,

    DMA_MODE_MASK = 0xc0,
    DMA_MODE_TRANSFER_ON_DEMAND = 0,
    DMA_MODE_TRANSFER_SINGLE = 0x40,
    DMA_MODE_TRANSFER_BLOCK = 0x80,
    DMA_MODE_TRANSFER_CASCADE = 0xC0
};

extern void i86_dma_set_address(unsigned short channel, unsigned char low, unsigned char high);
extern void i86_dma_set_count (unsigned short channel, unsigned char low, unsigned char high);
extern void i86_dma_set_external_page_registers (unsigned char channel, unsigned char val);
extern void i86_dma_mask_channel (unsigned char channel);
extern void i86_dma_unmask_channel (unsigned char channel);
extern void i86_dma_unmask_all();
extern void i86_dma_reset_flipflop (unsigned char dma);
extern void i86_dma_reset ();
extern void i86_dma_set_mode(unsigned char channel, unsigned char mode);
extern void i86_dma_set_read (unsigned char channel);
extern void i86_dma_set_write (unsigned char channel);

#endif