/*****************************************************************************************
 Copyright (c) 2002-2005 The UbixOS Project
 All rights reserved.

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 permitted provided that the following conditions are met:

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 conditions, the following disclaimer and the list of authors.  Redistributions in binary
 form must reproduce the above copyright notice, this list of conditions, the following
 disclaimer and the list of authors in the documentation and/or other materials provided
 with the distribution. Neither the name of the UbixOS Project nor the names of its
 contributors may be used to endorse or promote products derived from this software
 without specific prior written permission.

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 EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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 OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 $Id: dma.c 79 2016-01-11 16:21:27Z reddawg $

*****************************************************************************************/

#include <sys/dma.h>
#include <sys/io.h>

#define lowByte(x)  (x & 0x00FF)
#define highByte(x) ((x & 0xFF00) >> 8)
   
static uInt8 maskReg[8]   = { 0x0A, 0x0A, 0x0A, 0x0A, 0xD4, 0xD4, 0xD4, 0xD4 };
static uInt8 clearReg[8]  = { 0x0C, 0x0C, 0x0C, 0x0C, 0xD8, 0xD8, 0xD8, 0xD8 };
static uInt8 modeReg[8]   = { 0x0B, 0x0B, 0x0B, 0x0B, 0xD6, 0xD6, 0xD6, 0xD6 };
static uInt8 addrPort[8]  = { 0x00, 0x02, 0x04, 0x06, 0xC0, 0xC4, 0xC8, 0xCC };
static uInt8 pagePort[8]  = { 0x87, 0x83, 0x81, 0x82, 0x8F, 0x8B, 0x89, 0x8A };
static uInt8 countPort[8] = { 0x01, 0x03, 0x05, 0x07, 0xC2, 0xC6, 0xCA, 0xCE };

void dmaXfer(uInt8 channel,uInt32 address,uInt length,uInt8 read) {
  unsigned char page=0, mode=0;
  unsigned int offset = 0;
  if (read) {
    mode = 0x48 + channel;
    }
  else {
    mode = 0x44 + channel;
    }
  page = address >> 16;
  offset = address & 0xFFFF;
  length--;
  _dmaXfer(channel, page, offset, length, mode);
  }

void _dmaXfer(uInt8 dmaChannel,uInt8 page,uInt offset,uInt length,uInt8 mode) {
  //asm("cli");
  outportByte(maskReg[dmaChannel], 0x04 | dmaChannel);
  outportByte(clearReg[dmaChannel], 0x00);
  outportByte(modeReg[dmaChannel], mode);
  outportByte(addrPort[dmaChannel], lowByte(offset));
  outportByte(addrPort[dmaChannel], highByte(offset));
  outportByte(pagePort[dmaChannel], page);
  outportByte(countPort[dmaChannel], lowByte(length));
  outportByte(countPort[dmaChannel], highByte(length));
  outportByte(maskReg[dmaChannel], dmaChannel);
  //asm("sti");
  }

/***
 END
 ***/