static int bfin_EMAC_recv(struct eth_device *dev)
{
int length = 0;
for (;;) {
if ((rxbuf[rxIdx]->StatusWord & RX_COMP) == 0) {
length = -1;
break;
}
if ((rxbuf[rxIdx]->StatusWord & RX_DMAO) != 0) {
printf("Ethernet: rx dma overrun\n");
break;
}
if ((rxbuf[rxIdx]->StatusWord & RX_OK) == 0) {
printf("Ethernet: rx error\n");
break;
}
length = rxbuf[rxIdx]->StatusWord & 0x000007FF;
if (length <= 4) {
printf("Ethernet: bad frame\n");
break;
}
debug("%s: len = %d\n", __func__, length - 4);
NetRxPackets[rxIdx] =
(volatile uchar *)(rxbuf[rxIdx]->FrmData->Dest);
NetReceive(NetRxPackets[rxIdx], length - 4);
bfin_write_DMA1_IRQ_STATUS(DMA_DONE | DMA_ERR);
rxbuf[rxIdx]->StatusWord = 0x00000000;
if ((rxIdx + 1) >= PKTBUFSRX)
rxIdx = 0;
else
rxIdx++;
}
return length;
}
/* interrupt routine to handle rx and error signal */
static irqreturn_t bfin_mac_interrupt(int irq, void *dev_id)
{
struct net_device *dev = dev_id;
int number = 0;
get_one_packet:
if (current_rx_ptr->status.status_word == 0) {
/* no more new packet received */
if (number == 0) {
if (current_rx_ptr->next->status.status_word != 0) {
current_rx_ptr = current_rx_ptr->next;
goto real_rx;
}
}
bfin_write_DMA1_IRQ_STATUS(bfin_read_DMA1_IRQ_STATUS() |
DMA_DONE | DMA_ERR);
return IRQ_HANDLED;
}
real_rx:
bfin_mac_rx(dev);
number++;
goto get_one_packet;
}
