112 lines
2.6 KiB
C
112 lines
2.6 KiB
C
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/*
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* dma.c
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*
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* Created on: Aug 20, 2011
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* Author: Tiberiu
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*/
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#include <stdio.h>
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#include "dma.h"
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void DmaSetAddress (uint8 channel, uint8 low, uint8 high)
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{
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uint16 port = 0;
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switch (channel)
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{
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case 0: port = DmaRegisterChannel0Address; break;
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case 1: port = DmaRegisterChannel1Address; break;
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case 2: port = DmaRegisterChannel2Address; break;
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case 3: port = DmaRegisterChannel3Address; break;
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case 4: port = DmaRegisterChannel4Address; break;
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case 5: port = DmaRegisterChannel5Address; break;
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case 6: port = DmaRegisterChannel6Address; break;
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case 7: port = DmaRegisterChannel7Address; break;
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default: return;
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}
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outportb(port, low); iowait();
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outportb(port, high);
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}
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void DmaSetCount (uint8 channel, uint8 low, uint8 high)
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{
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uint16 port = 0;
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switch (channel)
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{
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case 0: port = DmaRegisterChannel0Count; break;
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case 1: port = DmaRegisterChannel1Count; break;
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case 2: port = DmaRegisterChannel2Count; break;
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case 3: port = DmaRegisterChannel3Count; break;
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case 4: port = DmaRegisterChannel4Count; break;
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case 5: port = DmaRegisterChannel5Count; break;
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case 6: port = DmaRegisterChannel6Count; break;
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case 7: port = DmaRegisterChannel7Count; break;
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default: return;
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}
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outportb(port, low); iowait();
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outportb(port, high);
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}
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void DmaSetExternalPageRegisters (uint8 channel, uint8 val)
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{
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uint16 port = 0;
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switch (channel)
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{
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case 1: port = DmaRegisterChannel1PageAddress; break;
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case 2: port = DmaRegisterChannel2PageAddress; break;
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case 3: port = DmaRegisterChannel3PageAddress; break;
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case 5: port = DmaRegisterChannel5PageAddress; break;
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case 6: port = DmaRegisterChannel6PageAddress; break;
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case 7: port = DmaRegisterChannel7PageAddress; break;
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default: return;
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}
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outportb(port, val);
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}
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void DmaResetFlipFlop (uint8 channel)
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{
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uint16 port = (channel < 4) ? DmaRegisterFlipFlopReset : 2*DmaRegisterFlipFlopReset+0xC0;
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outportb(port, 0);
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}
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void DmaReset ()
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{
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outportb(DmaRegisterMasterReset, 0);
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}
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void DmaUnmaskAll()
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{
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outportb(DmaRegisterMaskReset, 0);
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}
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void DmaMaskChannel(uint8 channel)
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{
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if (channel >= 8) return;
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uint16 port = (channel < 4) ? (DmaRegisterSingleChannelMask) : (2*DmaRegisterSingleChannelMask + 0xC0);
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outportb(port, channel%4 | 4);
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}
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void DmaUnmaskChannel (uint8 channel)
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{
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if (channel >= 8) return;
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uint16 port = (channel < 4) ? (DmaRegisterSingleChannelMask) : (2*DmaRegisterSingleChannelMask + 0xC0);
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outportb(port, channel%4);
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}
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void DmaSetMode (uint8 channel, uint8 mode)
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{
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if (channel >= 8) return;
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uint16 port = (channel < 4) ? (DmaRegisterMode) : (2*DmaRegisterMode + 0xC0);
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DmaMaskChannel(channel);
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outportb(port, (channel%4) | mode );
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DmaUnmaskAll();
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}
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