/******************************************************************************
* ae531x_RxQueueCreate - create a circular queue of Rx descriptors
*/
int
ae531x_RxQueueCreate(ae531x_MAC_t *MACInfo,
AE531X_QUEUE *q,
char *pMem,
int count)
{
int i;
VIRT_ADDR descAddr;
ARRIVE();
ae531x_QueueInit(q, pMem, count);
q->reapDescAddr = NULL;
/* Initialize Rx buffer descriptors */
for (i=0, descAddr=q->firstDescAddr;
i<count;
i++, descAddr=(VIRT_ADDR)((UINT32)descAddr + AE531X_QUEUE_ELE_SIZE))
{
void *swptr;
char *rxBuffer;
int rxBufferSize;
swptr = ae531x_rxbuf_alloc(MACInfo, &rxBuffer, &rxBufferSize);
if (swptr == NULL) {
AE531X_PRINT(AE531X_DEBUG_RESET,
("eth%d RX queue: ae531x_rxbuf_alloc failed\n",
MACInfo->unit));
ae531x_QueueDestroy(q);
return -1;
}
AE531X_DESC_SWPTR_SET(descAddr, swptr);
AE531X_DESC_STATUS_SET(descAddr, DescOwnByDma);
AE531X_DESC_CTRLEN_SET(descAddr, rxBufferSize);
AE531X_DESC_BUFPTR_SET(descAddr, virt_to_bus(rxBuffer));
AE531X_DESC_LNKBUF_SET(descAddr, (UINT32)0);
} /* for each desc */
/* Make the queue circular */
AE531X_DESC_CTRLEN_SET(q->lastDescAddr,
DescEndOfRing|AE531X_DESC_CTRLEN_GET(q->lastDescAddr));
AE531X_PRINT(AE531X_DEBUG_RESET,
("eth%d Rxbuf begin = %x, end = %x\n",
MACInfo->unit,
(UINT32)q->firstDescAddr,
(UINT32)q->lastDescAddr));
LEAVE();
return 0;
}
static int ae531x_poll(struct eth_device *dev)
{
ae531xRxBuf_t *rxBuf, *newRxBuf;
char *rxBufData;
int unused_length;
VIRT_ADDR rxDesc;
int length;
ae531x_MAC_t *MACInfo;
unsigned int cmdsts;
ae531x_priv_data_t *ae531x_priv;
ae531x_priv = (ae531x_priv_data_t *)dev->priv;
MACInfo = (ae531x_MAC_t *)&ae531x_priv->MACInfo;
do {
for(;;) {
rxDesc = MACInfo->rxQueue.curDescAddr;
cmdsts = AE531X_DESC_STATUS_GET(KSEG1ADDR(rxDesc));
if (cmdsts & DescOwnByDma) {
/* There's nothing left to process in the RX ring */
goto rx_all_done;
}
AE531X_PRINT(AE531X_DEBUG_RX,
("consume rxDesc %p with cmdsts=0x%x\n",
(void *)rxDesc, cmdsts));
AE531X_CONSUME_DESC((&MACInfo->rxQueue));
A_DATA_CACHE_INVAL(rxDesc, AE531X_DESC_SIZE);
/* Process a packet */
length = AE531X_DESC_STATUS_RX_SIZE(cmdsts) - ETH_CRC_LEN;
if ( (cmdsts & (DescRxFirst |DescRxLast | DescRxErrors)) ==
(DescRxFirst | DescRxLast) ) {
/* Descriptor status indicates "NO errors" */
rxBuf = AE531X_DESC_SWPTR_GET(rxDesc);
/*
* Allocate a replacement buffer
* We want to get another buffer ready for Rx ASAP.
*/
newRxBuf = ae531x_rxbuf_alloc(MACInfo, &rxBufData, &unused_length);
if(newRxBuf == NULL ) {
/*
* Give this descriptor back to the DMA engine,
* and drop the received packet.
*/
AE531X_PRINT(AE531X_DEBUG_ERROR,
("Can't allocate new rx buf\n"));
} else {
//diag_printf("rxBufData=%p\n",rxBufData);
AE531X_DESC_BUFPTR_SET(rxDesc, virt_to_bus(rxBufData));
AE531X_DESC_SWPTR_SET(rxDesc, newRxBuf);
}
AE531X_DESC_STATUS_SET(rxDesc, DescOwnByDma);
rxDesc = NULL; /* sanity -- cannot use rxDesc now */
sysWbFlush();
if (newRxBuf == NULL) {
goto no_rx_bufs;
} else {
/* Sync data cache w.r.t. DMA */
A_DATA_CACHE_INVAL(rxBuf->data, length);
/* Send the data up the stack */
AE531X_PRINT(AE531X_DEBUG_RX,
("Send data up stack: rxBuf=%p data=%p length=%d\n",
(void *)rxBuf, (void *)rxBuf->data, length));
{
unsigned long oldIntrState;
rxBuf->next = NULL;
intDisable(oldIntrState);
if (ae531xRxRecvdListHead) {
ae531xRxRecvdListTail->next = rxBuf;
ae531xRxRecvdListTail = rxBuf;
} else {
ae531xRxRecvdListHead = rxBuf;
ae531xRxRecvdListTail = rxBuf;
}
intEnable(oldIntrState);
}
NetReceive(rxBuf->data, length);
/* Free driver Rx buffer */
ae531x_rxbuf_free(rxBuf);
}
} else {
AE531X_PRINT(AE531X_DEBUG_ERROR,
("Bad receive. rxDesc=%p cmdsts=0x%8.8x\n",
(void *)rxDesc, cmdsts));
}
}
} while (ae531x_ReadDmaReg(MACInfo, DmaStatus) & DmaIntRxCompleted);
rx_all_done:
ae531x_SetDmaReg(MACInfo, DmaIntrEnb,
DmaIeRxCompleted | DmaIeRxNoBuffer);
ae531x_WriteDmaReg(MACInfo, DmaRxPollDemand, 0);
no_rx_bufs:
return;
}