/******************************************************************************
*
* ae531x_DmaIntClear - Clear DMA interrupts
*
* RETURNS: N/A
*/
static void
ae531x_DmaIntClear(ae531x_MAC_t *MACInfo)
{
/* clear all interrupt requests */
ae531x_WriteDmaReg(MACInfo, DmaStatus,
ae531x_ReadDmaReg(MACInfo, DmaStatus));
}
/******************************************************************************
*
* ae531x_DmaReset - Reset DMA and TLI controllers
*
* RETURNS: N/A
*/
void
ae531x_DmaReset(ae531x_MAC_t *MACInfo)
{
int i;
UINT32 descAddr;
unsigned long oldIntrState;
ARRIVE();
/* Disable device interrupts prior to any errors during stop */
intDisable(oldIntrState);
/* Disable MAC rx and tx */
ae531x_ClearMacReg(MACInfo, MacControl, (MacRxEnable | MacTxEnable));
/* Reset dma controller */
ae531x_WriteDmaReg(MACInfo, DmaBusMode, DmaResetOn);
/* Delay 2 usec */
sysUDelay(2);
/* Flush the rx queue */
descAddr = (UINT32)MACInfo->rxQueue.firstDescAddr;
MACInfo->rxQueue.curDescAddr = MACInfo->rxQueue.firstDescAddr;
for (i=0;
i<(MACInfo->rxDescCount);
i++, descAddr += AE531X_QUEUE_ELE_SIZE) {
AE531X_DESC_STATUS_SET(descAddr, DescOwnByDma);
}
/* Flush the tx queue */
descAddr = (UINT32)MACInfo->txQueue.firstDescAddr;
MACInfo->txQueue.curDescAddr = MACInfo->txQueue.firstDescAddr;
MACInfo->txQueue.reapDescAddr = MACInfo->txQueue.lastDescAddr;
for (i=0;
i<(MACInfo->txDescCount);
i++, descAddr += AE531X_QUEUE_ELE_SIZE) {
AE531X_DESC_STATUS_SET (descAddr, 0);
}
/* Set init register values */
ae531x_WriteDmaReg(MACInfo, DmaBusMode, DmaBusModeInit);
/* Install the first Tx and Rx queues on the device */
ae531x_WriteDmaReg(MACInfo, DmaRxBaseAddr,
(UINT32)MACInfo->rxQueue.firstDescAddr);
ae531x_WriteDmaReg(MACInfo, DmaTxBaseAddr,
(UINT32)MACInfo->txQueue.firstDescAddr);
ae531x_WriteDmaReg(MACInfo, DmaControl, DmaStoreAndForward);
ae531x_WriteDmaReg(MACInfo, DmaIntrEnb, DmaIntDisable);
AE531X_PRINT(AE531X_DEBUG_RESET,
("eth%d: DMA RESET!\n", MACInfo->unit));
/* Turn on device interrupts -- enable most errors */
ae531x_DmaIntClear(MACInfo); /* clear interrupt requests */
ae531x_DmaIntEnable(MACInfo); /* enable interrupts */
ae531x_EndResetMode(MACInfo);
intEnable(oldIntrState);
LEAVE();
}
/******************************************************************************
*
* ae531x_DmaIntDisable - Disable DMA interrupts
*
* RETURNS: N/A
*/
void
ae531x_DmaIntDisable(ae531x_MAC_t *MACInfo)
{
ae531x_WriteDmaReg(MACInfo, DmaIntrEnb, DmaIntDisable);
}
/******************************************************************************
*
* ae531x_AckIntr - clear interrupt bits in the status register.
* Note: Interrupt bits are *cleared* by writing a 1.
*/
void
ae531x_AckIntr(ae531x_MAC_t *MACInfo, UINT32 data)
{
ae531x_WriteDmaReg(MACInfo, DmaStatus, data);
}
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;
}
static int ae531x_send(struct eth_device *dev, volatile void *packet, int length)
{
ae531x_priv_data_t *ae531x_priv;
ae531x_MAC_t *MACInfo;
UINT32 ctrlen;
VIRT_ADDR txDesc;
ae531xTxBuf_t *TxBuf;
unsigned char *TxBufData, *TxBufDataStart;
int i;
volatile UINT32 regval;
ae531x_priv = (ae531x_priv_data_t *)dev->priv;
MACInfo = (ae531x_MAC_t *)&ae531x_priv->MACInfo;
/* Check if this port is up, else toss packet */
if (!MACInfo->port_is_up)
{
goto dropFrame;
}
if (ae531x_IsInResetMode(MACInfo))
{
goto dropFrame;
}
ae531x_TxReap(MACInfo);
txDesc = MACInfo->txQueue.curDescAddr;
if (txDesc == MACInfo->txQueue.reapDescAddr)
{
goto dropFrame;
}
AE531X_CONSUME_DESC((&MACInfo->txQueue));
ae531xTxAvail--;
/* Allocate a transmit data buffer */
ae531x_txbuf_alloc(MACInfo, &TxBuf);
AE531X_DESC_SWPTR_SET(txDesc, TxBuf);
TxBufDataStart = TxBufData = TxBuf->data;
if (length< 60)
{
length= 60;
}
memcpy(TxBufData, packet, length);
TxBufData += length;
/* Update the descriptor */
AE531X_DESC_BUFPTR_SET(txDesc, virt_to_bus(TxBufDataStart));
ctrlen = AE531X_DESC_CTRLEN_GET(txDesc);
ctrlen = (ctrlen & (DescEndOfRing)) |
DescTxFirst |
DescTxLast |
DescTxIntEnable;
ctrlen |= ((length << DescSize1Shift) & DescSize1Mask);
AE531X_DESC_CTRLEN_SET(txDesc, ctrlen);
AE531X_DESC_STATUS_SET(txDesc, DescOwnByDma);
/* Alert DMA engine to resume Tx */
ae531x_WriteDmaReg(MACInfo, DmaTxPollDemand, 0);
sysWbFlush();
dropFrame:
return length;
}
