patch-2.4.22 linux-2.4.22/arch/mips/galileo-boards/ev64120/dma.c

• Lines: 169
• Date: 1969-12-31 16:00:00.000000000 -0800
• Orig file: linux-2.4.21/arch/mips/galileo-boards/ev64120/dma.c
• Orig date: 2002-11-28 15:53:10.000000000 -0800

diff -urN linux-2.4.21/arch/mips/galileo-boards/ev64120/dma.c linux-2.4.22/arch/mips/galileo-boards/ev64120/dma.c
@@ -1,168 +0,0 @@
-/* DMA.C - DMA functions and definitions */
-
-/* Copyright Galileo Technology. */
-
-/*
-DESCRIPTION
-This file gives the user a complete interface to the powerful DMA engines,
-including functions for controling the priority mechanism.
-To fully understand the capabilities of the DMA engines please spare some
-time to go trough the spec.
-*/
-
-/* includes */
-
-#ifdef __linux__
-#include <asm/galileo/evb64120A/core.h>
-#include <asm/galileo/evb64120A/dma.h>
-#else
-#include "Core.h"
-#include "DMA.h"
-#endif
-/********************************************************************
-* dmaCommand - Write a command to a DMA channel
-*
-* Inputs: DMA_ENGINE channel - choosing one of the four engine.
-*         unsigned int command - The command to be written to the control register.
-* Returns: false if one of the parameters is erroneous else returns true.
-*********************************************************************/
-
-bool dmaCommand(DMA_ENGINE channel, unsigned int command)
-{
-	if (channel > LAST_DMA_ENGINE)
-		return false;
-	GT_REG_WRITE(CHANNEL0CONTROL + channel * 4, command);
-	return true;
-}
-
-/********************************************************************
-* dmaTransfer - transfer data from sourceAddr to destAddr on DMA channel
-* Inputs:
-*   DMA_RECORED *nextRecoredPointer: If we are using chain mode DMA transfer,
-*   then this pointer should point to the next recored,otherwise it should be
-*   NULL.
-*   VERY IMPORTANT !!! When using chain mode, the records must be 16 Bytes
-*   aligned, the function will take care of that for you, but you need to
-*   allocate one more record for that, meaning: if you are having 3 records ,
-*   declare 4 (see the example bellow) and start using the second one.
-*   Example:
-*   Performing a chain mode DMA transfer(Copy a 1/4 mega of data using
-*   chain mode DMA):
-*    DMA_RECORED dmaRecoredArray[4];
-*    dmaRecoredArray[1].ByteCnt = _64KB;
-*    dmaRecoredArray[1].DestAdd = destAddress + _64KB;
-*    dmaRecoredArray[1].SrcAdd  = sourceAddress + _64KB;
-*    dmaRecoredArray[1].NextRecPtr = &dmaRecoredArray[2];
-*    dmaRecoredArray[2].ByteCnt = _64KB;
-*    dmaRecoredArray[2].DestAdd = destAddress + 2*_64KB;
-*    dmaRecoredArray[2].SrcAdd  = sourceAddress + 2*_64KB;
-*    dmaRecoredArray[2].NextRecPtr = &dmaRecoredArray[3];
-*    dmaRecoredArray[3].ByteCnt = _64KB;
-*    dmaRecoredArray[3].DestAdd = destAddress + 3*_64KB;
-*    dmaRecoredArray[3].SrcAdd  = sourceAddress + 3*_64KB;
-*    dmaRecoredArray[3].NextRecPtr = NULL;
-*    performCmDma(0,sourceAddress,destAddress,_64KB,PLAIN,WAIT_TO_END,
-*                            &dmaRecoredArray[1]);
-* Returns: NO_SUCH_CHANNEL if channel does not exist, CHANNEL_BUSY if channel
-*          is active and true if the transfer ended successfully
-*********************************************************************/
-
-DMA_STATUS dmaTransfer(DMA_ENGINE channel, unsigned int sourceAddr,
-		       unsigned int destAddr, unsigned int numOfBytes,
-		       unsigned int command,
-		       DMA_RECORED * nextRecoredPointer)
-{
-	unsigned int tempData, checkBits, alignmentOffset = 0;
-	DMA_RECORED *next = nextRecoredPointer;
-
-	if (channel > LAST_DMA_ENGINE)
-		return NO_SUCH_CHANNEL;
-	if (numOfBytes > 0xffff)
-		return GENERAL_ERROR;
-	if (isDmaChannelActive(channel))
-		return CHANNEL_BUSY;
-	if (next != NULL) {	/* case of chain Mode */
-		alignmentOffset = ((unsigned int) next % 16);
-	}
-	checkBits = command & 0x6000000;
-	if (checkBits == 0) {
-		while (next != NULL) {
-			WRITE_WORD((unsigned int) next - alignmentOffset,
-				   next->ByteCnt);
-			tempData = (unsigned int) next->SrcAdd;
-			WRITE_WORD((unsigned int) next + 4 -
-				   alignmentOffset, tempData & 0x5fffffff);
-			tempData = (unsigned int) next->DestAdd;
-			WRITE_WORD((unsigned int) next + 8 -
-				   alignmentOffset, tempData & 0x5fffffff);
-			tempData = (unsigned int) next->NextRecPtr;
-			WRITE_WORD((unsigned int) next + 12 -
-				   alignmentOffset,
-				   tempData & 0x5fffffff -
-				   alignmentOffset);
-			next = (DMA_RECORED *) tempData;
-			if (next == nextRecoredPointer)
-				next = NULL;
-		}
-	}
-	GT_REG_WRITE(CHANNEL0_DMA_BYTE_COUNT + channel * 4, numOfBytes);
-	tempData = sourceAddr;
-	GT_REG_WRITE(CHANNEL0_DMA_SOURCE_ADDRESS + channel * 4,
-		     tempData & 0x5fffffff);
-	tempData = destAddr;
-	GT_REG_WRITE(CHANNEL0_DMA_DESTINATION_ADDRESS + channel * 4,
-		     tempData & 0x5fffffff);
-	if (nextRecoredPointer != NULL) {
-		tempData =
-		    (unsigned int) nextRecoredPointer - alignmentOffset;
-		GT_REG_WRITE(CHANNEL0NEXT_RECORD_POINTER + 4 * channel,
-			     tempData & 0x5fffffff);
-		command = command | CHANNEL_ENABLE;
-	} else {
-		command = command | CHANNEL_ENABLE | NON_CHAIN_MOD;
-	}
-	/* Activate DMA engine By writting to dmaControlRegister */
-	GT_REG_WRITE(CHANNEL0CONTROL + channel * 4, command);
-
-	return DMA_OK;
-}
-
-/********************************************************************
-* isDmaChannelActive - check if channel is busy
-*
-* Inputs: channel number
-* RETURNS: True if the channel is busy, false otherwise.
-*********************************************************************/
-
-bool isDmaChannelActive(DMA_ENGINE channel)
-{
-	unsigned int data;
-
-	if (channel > LAST_DMA_ENGINE)
-		return false;
-	GT_REG_READ(CHANNEL0CONTROL + 4 * channel, &data);
-	if (data & DMA_ACTIVITY_STATUS)
-		return true;
-	else
-		return false;
-}
-
-
-/********************************************************************
-* changeDmaPriority - update the arbiter`s priority for channels 0-3
-*
-* Inputs: priority  for channels 0-1, priority  for channels 2-3,
-          priority for groups and other priority options
-* RETURNS: false if one of the parameters is erroneous and true else
-*********************************************************************/
-
-bool changeDmaPriority(PRIO_CHAN_0_1 prio_01, PRIO_CHAN_2_3 prio_23,
-		       PRIO_GROUP prioGrp, PRIO_OPT prioOpt)
-{
-	unsigned int prioReg = 0;
-
-	prioReg = (prio_01 & 0x3) + ((prio_23 & 0x3) << 2) +
-	    ((prioGrp & 0x3) << 4) + (prioOpt << 6);
-	GT_REG_WRITE(ARBITER_CONTROL, prioReg);
-	return true;
-}