PCIe memory write using EDMA

Hi,

I tested the code provided by TI to do PCIe communication between two Shannon and it works fine.

Now i want to replace the CPU write to "pcieBase" with the EDMA, so i replaced the loop :

for (i=0; i<PCIE_BUFSIZE_APP; i++)
{
*((volatile uint32_t *)pcieBase + i) = srcBuf[i];
}

by a function that uses EDMA to write in pcieBase :

edma_ping_pong_xfer_gbl_region(0, 0,srcBuf,(volatile uint32_t *)pcieBase,PCIE_BUFSIZE_APP*4 + 4);

edma_ping_pong_xfer_gbl_region(EDMA instance number,Channel number ,source address,Destination address,ACNT);

The function is defined below :

Int32 edma_ping_pong_xfer_gbl_region (Int32 instNum, Uint8 channelNum, uint32_t *Src, volatile uint32_t *dst, uint32_t acnt)
{
CSL_Edma3Handle hModule;
CSL_Edma3Obj edmaObj;
CSL_Edma3ParamHandle hParamPing;
CSL_Edma3ChannelObj chObj;
CSL_Edma3CmdIntr regionIntr;
CSL_Edma3ChannelHandle hChannel;
CSL_Edma3ParamSetup myParamSetup;
CSL_Edma3Context context;
CSL_Edma3ChannelAttr chAttr;
CSL_Status status;

/* Start the EDMA PING-PONG test over the Global Region. */
printf ("Debug: Testing EDMA(%d) Ping-Pong Test (Global) Region for Channel %d...\n", instNum, channelNum);

/* Module initialization */
if (CSL_edma3Init(&context) != CSL_SOK)
{
printf ("Error: EDMA module initialization failed\n");
return -1;
}

/* Open the EDMA Module using the provided instance number */
hModule = CSL_edma3Open(&edmaObj, instNum, NULL, &status);
if ( (hModule == NULL) || (status != CSL_SOK))
{
printf ("Error: EDMA module open failed\n");
return -1;
}

/* Channel open */
chAttr.regionNum = CSL_EDMA3_REGION_GLOBAL;
chAttr.chaNum = channelNum;
hChannel = CSL_edma3ChannelOpen(&chObj, instNum, &chAttr, &status);
if ((hChannel == NULL) || (status != CSL_SOK))
{
printf ("Error: Unable to open EDMA Channel:%d\n", channelNum);
return -1;
}

if(!instNum)
{
/* For first EDMA instance there are only 2 TCs and 2 event queues
* Modify the channel default queue setup from 0 to 1
*/
if (CSL_edma3HwChannelSetupQue(hChannel,CSL_EDMA3_QUE_1) != CSL_SOK)
{
printf ("Error: EDMA channel setup queue failed\n");
return -1;
}
}
else
{
/* For EDMA instance 1 and 2 maximum of 4 TCs and 4 event queues are supported
* Change Channel Default queue setup from 0 to 3
*/
if (CSL_edma3HwChannelSetupQue(hChannel,CSL_EDMA3_QUE_3) != CSL_SOK)
{
printf ("Error: EDMA channel setup queue failed\n");
return -1;
}
}

/* Map the DMA Channel to PARAM Block 2. */
CSL_edma3MapDMAChannelToParamBlock (hModule, channelNum, 2);

/* Obtain a handle to parameter set 2 */
hParamPing = CSL_edma3GetParamHandle(hChannel, 2, &status);
if (hParamPing == NULL)
{
printf ("Error: EDMA Get Parameter Entry failed for 2.\n");
return -1;
}

/* Setup the parameter entry parameters (Ping buffer) */
myParamSetup.option = CSL_EDMA3_OPT_MAKE(CSL_EDMA3_ITCCH_DIS, \
CSL_EDMA3_TCCH_DIS, \
CSL_EDMA3_ITCINT_DIS, \
CSL_EDMA3_TCINT_EN, \
0, CSL_EDMA3_TCC_NORMAL,\
CSL_EDMA3_FIFOWIDTH_NONE, \
CSL_EDMA3_STATIC_DIS, \
CSL_EDMA3_SYNC_A, \
CSL_EDMA3_ADDRMODE_INCR, \
CSL_EDMA3_ADDRMODE_INCR );
myParamSetup.srcAddr = (Uint32)Src;
myParamSetup.aCntbCnt = CSL_EDMA3_CNT_MAKE(acnt,1);
myParamSetup.dstAddr = (Uint32)dst;
myParamSetup.srcDstBidx = CSL_EDMA3_BIDX_MAKE(0,0);
myParamSetup.linkBcntrld= CSL_EDMA3_LINKBCNTRLD_MAKE(0xFFFF,1);
myParamSetup.srcDstCidx = CSL_EDMA3_CIDX_MAKE(0,0);
myParamSetup.cCnt = 1;

/* Ping setup */
if (CSL_edma3ParamSetup(hParamPing,&myParamSetup) != CSL_SOK)
{
printf ("Error: EDMA Parameter Entry Setup failed\n");
return -1;
}

/* Interrupt enable (Bits 0-1) for the global region interrupts */
regionIntr.region = CSL_EDMA3_REGION_GLOBAL;
regionIntr.intr = 0x3;
regionIntr.intrh = 0x0000;
CSL_edma3HwControl(hModule,CSL_EDMA3_CMD_INTR_ENABLE,&regionIntr);

/* Trigger channel */
CSL_edma3HwChannelControl(hChannel,CSL_EDMA3_CMD_CHANNEL_SET,NULL);

regionIntr.region = CSL_EDMA3_REGION_GLOBAL;
regionIntr.intr = 0;
regionIntr.intrh = 0;

/* Poll on IPR bit 0 */
do {
CSL_edma3GetHwStatus(hModule,CSL_EDMA3_QUERY_INTRPEND,&regionIntr);
} while (!(regionIntr.intr & 0x1));

/* Clear the pending bit */
CSL_edma3HwControl(hModule,CSL_EDMA3_CMD_INTRPEND_CLEAR,&regionIntr);

/* Close channel */
if (CSL_edma3ChannelClose(hChannel) != CSL_SOK)
{
printf("Error: EDMA Channel Close failed\n");
return -1;
}

/* Close EDMA module */
if (CSL_edma3Close(hModule) != CSL_SOK)
{
printf("Error: EDMA Module Close failed\n");
return -1;
}

/* The test passed. */
printf("EDMA transfer executed \n");
int j;
for(j=0;j<41;j++) {
printf("src[%d]=%d \n",j,Src[j]);
printf("Srcadd[%d]=%d \n",j,&Src[j]);
}
for(j=0;j<41;j++) {
printf("dst[%d]=%d \n",j,dst[j]);
printf("dstadd[%d]=%d \n",j,&dst[j]);
}
return 0;
}

Regards.