epic100.c

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	spin_unlock_irq(&ep->lock);

	/* Trigger an immediate transmit demand. */
	outl(TxQueued, dev->base_addr + COMMAND);

	dev->trans_start = jiffies;
	if (debug > 4)
		printk(KERN_DEBUG "%s: Queued Tx packet size %d to slot %d, "
			   "flag %2.2x Tx status %8.8x.\n",
			   dev->name, (int)skb->len, entry, ctrl_word,
			   (int)inl(dev->base_addr + TxSTAT));

	return 0;
}

/* The interrupt handler does all of the Rx thread work and cleans up
   after the Tx thread. */
static void epic_interrupt(int irq, void *dev_instance, struct pt_regs *regs)
{
	struct net_device *dev = (struct net_device *)dev_instance;
	struct epic_private *ep = (struct epic_private *)dev->priv;
	long ioaddr = dev->base_addr;
	int status, boguscnt = max_interrupt_work;

	spin_lock(&ep->lock);

	do {
		status = inl(ioaddr + INTSTAT);
		/* Acknowledge all of the current interrupt sources ASAP. */
		outl(status & 0x00007fff, ioaddr + INTSTAT);

		if (debug > 4)
			printk(KERN_DEBUG "%s: Interrupt, status=%#8.8x new "
				   "intstat=%#8.8x.\n",
				   dev->name, status, (int)inl(ioaddr + INTSTAT));

		if ((status & IntrSummary) == 0)
			break;

		if (status & (RxDone | RxStarted | RxEarlyWarn | RxOverflow))
			epic_rx(dev);

		if (status & (TxEmpty | TxDone)) {
			unsigned int dirty_tx, cur_tx;

			/* Note: if this lock becomes a problem we can narrow the locked
			   region at the cost of occasionally grabbing the lock more
			   times. */
			cur_tx = ep->cur_tx;
			dirty_tx = ep->dirty_tx;
			for (; cur_tx - dirty_tx > 0; dirty_tx++) {
				int entry = dirty_tx % TX_RING_SIZE;
				int txstatus = le32_to_cpu(ep->tx_ring[entry].txstatus);

				if (txstatus & DescOwn)
					break;			/* It still hasn't been Txed */

				if ( ! (txstatus & 0x0001)) {
					/* There was an major error, log it. */
#ifndef final_version
					if (debug > 1)
						printk("%s: Transmit error, Tx status %8.8x.\n",
							   dev->name, txstatus);
#endif
					ep->stats.tx_errors++;
					if (txstatus & 0x1050) ep->stats.tx_aborted_errors++;
					if (txstatus & 0x0008) ep->stats.tx_carrier_errors++;
					if (txstatus & 0x0040) ep->stats.tx_window_errors++;
					if (txstatus & 0x0010) ep->stats.tx_fifo_errors++;
#ifdef ETHER_STATS
					if (txstatus & 0x1000) ep->stats.collisions16++;
#endif
				} else {
#ifdef ETHER_STATS
					if ((txstatus & 0x0002) != 0) ep->stats.tx_deferred++;
#endif
					ep->stats.collisions += (txstatus >> 8) & 15;
					ep->stats.tx_packets++;
					ep->stats.tx_bytes += ep->tx_skbuff[entry]->len;
				}

				/* Free the original skb. */
				dev_kfree_skb_irq(ep->tx_skbuff[entry]);
				ep->tx_skbuff[entry] = 0;
			}

#ifndef final_version
			if (cur_tx - dirty_tx > TX_RING_SIZE) {
				printk("%s: Out-of-sync dirty pointer, %d vs. %d, full=%d.\n",
					   dev->name, dirty_tx, cur_tx, ep->tx_full);
				dirty_tx += TX_RING_SIZE;
			}
#endif
			ep->dirty_tx = dirty_tx;
			if (ep->tx_full
				&& cur_tx - dirty_tx < TX_QUEUE_LEN - 4) {
				/* The ring is no longer full, clear tbusy. */
				ep->tx_full = 0;
				netif_wake_queue(dev);
			}
		}

		/* Check uncommon events all at once. */
		if (status & (CntFull | TxUnderrun | RxOverflow | RxFull |
					  PCIBusErr170 | PCIBusErr175)) {
			if (status == 0xffffffff) /* Chip failed or removed (CardBus). */
				break;
			/* Always update the error counts to avoid overhead later. */
			ep->stats.rx_missed_errors += inb(ioaddr + MPCNT);
			ep->stats.rx_frame_errors += inb(ioaddr + ALICNT);
			ep->stats.rx_crc_errors += inb(ioaddr + CRCCNT);

			if (status & TxUnderrun) { /* Tx FIFO underflow. */
				ep->stats.tx_fifo_errors++;
				outl(ep->tx_threshold += 128, ioaddr + TxThresh);
				/* Restart the transmit process. */
				outl(RestartTx, ioaddr + COMMAND);
			}
			if (status & RxOverflow) {		/* Missed a Rx frame. */
				ep->stats.rx_errors++;
			}
			if (status & (RxOverflow | RxFull))
				outw(RxQueued, ioaddr + COMMAND);
			if (status & PCIBusErr170) {
				printk(KERN_ERR "%s: PCI Bus Error!  EPIC status %4.4x.\n",
					   dev->name, status);
				epic_pause(dev);
				epic_restart(dev);
			}
			/* Clear all error sources. */
			outl(status & 0x7f18, ioaddr + INTSTAT);
		}
		if (--boguscnt < 0) {
			printk(KERN_ERR "%s: Too much work at interrupt, "
				   "IntrStatus=0x%8.8x.\n",
				   dev->name, status);
			/* Clear all interrupt sources. */
			outl(0x0001ffff, ioaddr + INTSTAT);
			break;
		}
	} while (1);

	if (debug > 3)
		printk(KERN_DEBUG "%s: exiting interrupt, intr_status=%#4.4x.\n",
			   dev->name, status);

	spin_unlock(&ep->lock);
}

static int epic_rx(struct net_device *dev)
{
	struct epic_private *ep = (struct epic_private *)dev->priv;
	int entry = ep->cur_rx % RX_RING_SIZE;
	int rx_work_limit = ep->dirty_rx + RX_RING_SIZE - ep->cur_rx;
	int work_done = 0;

	if (debug > 4)
		printk(KERN_DEBUG " In epic_rx(), entry %d %8.8x.\n", entry,
			   ep->rx_ring[entry].rxstatus);
	/* If we own the next entry, it's a new packet. Send it up. */
	while (!(le32_to_cpu(ep->rx_ring[entry].rxstatus) & DescOwn)) { 
		int status = le32_to_cpu(ep->rx_ring[entry].rxstatus);

		if (debug > 4)
			printk(KERN_DEBUG "  epic_rx() status was %8.8x.\n", status);
		if (--rx_work_limit < 0)
			break;
		if (status & 0x2006) {
			if (debug > 2)
				printk(KERN_DEBUG "%s: epic_rx() error status was %8.8x.\n",
					   dev->name, status);
			if (status & 0x2000) {
				printk(KERN_WARNING "%s: Oversized Ethernet frame spanned "
					   "multiple buffers, status %4.4x!\n", dev->name, status);
				ep->stats.rx_length_errors++;
			} else if (status & 0x0006)
				/* Rx Frame errors are counted in hardware. */
				ep->stats.rx_errors++;
		} else {
			/* Malloc up new buffer, compatible with net-2e. */
			/* Omit the four octet CRC from the length. */
			short pkt_len = (status >> 16) - 4;
			struct sk_buff *skb;

			if (pkt_len > PKT_BUF_SZ - 4) {
				printk(KERN_ERR "%s: Oversized Ethernet frame, status %x "
					   "%d bytes.\n",
					   dev->name, pkt_len, status);
				pkt_len = 1514;
			}
			/* Check if the packet is long enough to accept without copying
			   to a minimally-sized skbuff. */
			if (pkt_len < rx_copybreak
				&& (skb = dev_alloc_skb(pkt_len + 2)) != NULL) {
				skb->dev = dev;
				skb_reserve(skb, 2);	/* 16 byte align the IP header */
#if 1 /* HAS_IP_COPYSUM */
				eth_copy_and_sum(skb, ep->rx_skbuff[entry]->tail, pkt_len, 0);
				skb_put(skb, pkt_len);
#else
				memcpy(skb_put(skb, pkt_len), ep->rx_skbuff[entry]->tail,
					   pkt_len);
#endif
			} else {
				skb_put(skb = ep->rx_skbuff[entry], pkt_len);
				ep->rx_skbuff[entry] = NULL;
			}
			skb->protocol = eth_type_trans(skb, dev);
			netif_rx(skb);
			ep->stats.rx_packets++;
			ep->stats.rx_bytes += pkt_len;
		}
		work_done++;
		entry = (++ep->cur_rx) % RX_RING_SIZE;
	}

	/* Refill the Rx ring buffers. */
	for (; ep->cur_rx - ep->dirty_rx > 0; ep->dirty_rx++) {
		entry = ep->dirty_rx % RX_RING_SIZE;
		if (ep->rx_skbuff[entry] == NULL) {
			struct sk_buff *skb;
			skb = ep->rx_skbuff[entry] = dev_alloc_skb(ep->rx_buf_sz);
			if (skb == NULL)
				break;
			skb->dev = dev;			/* Mark as being used by this device. */
			skb_reserve(skb, 2);	/* Align IP on 16 byte boundaries */
			ep->rx_ring[entry].bufaddr = virt_to_le32desc(skb->tail);
			work_done++;
		}
		ep->rx_ring[entry].rxstatus = cpu_to_le32(DescOwn);
	}
	return work_done;
}

static int epic_close(struct net_device *dev)
{
	long ioaddr = dev->base_addr;
	struct epic_private *ep = (struct epic_private *)dev->priv;
	int i;

	netif_stop_queue(dev);

	if (debug > 1)
		printk(KERN_DEBUG "%s: Shutting down ethercard, status was %2.2x.\n",
			   dev->name, (int)inl(ioaddr + INTSTAT));

	del_timer_sync(&ep->timer);
	epic_pause(dev);
	free_irq(dev->irq, dev);

	/* Free all the skbuffs in the Rx queue. */
	for (i = 0; i < RX_RING_SIZE; i++) {
		struct sk_buff *skb = ep->rx_skbuff[i];
		ep->rx_skbuff[i] = 0;
		ep->rx_ring[i].rxstatus = 0;		/* Not owned by Epic chip. */
		ep->rx_ring[i].buflength = 0;
		ep->rx_ring[i].bufaddr = 0xBADF00D0; /* An invalid address. */
		if (skb) {
			dev_kfree_skb(skb);
		}
	}
	for (i = 0; i < TX_RING_SIZE; i++) {
		if (ep->tx_skbuff[i])
			dev_kfree_skb(ep->tx_skbuff[i]);
		ep->tx_skbuff[i] = 0;
	}

	/* Green! Leave the chip in low-power mode. */
	outl(0x0008, ioaddr + GENCTL);

	MOD_DEC_USE_COUNT;
	return 0;
}

static struct net_device_stats *epic_get_stats(struct net_device *dev)
{
	struct epic_private *ep = (struct epic_private *)dev->priv;
	long ioaddr = dev->base_addr;

	if (netif_running(dev)) {
		/* Update the error counts. */
		ep->stats.rx_missed_errors += inb(ioaddr + MPCNT);
		ep->stats.rx_frame_errors += inb(ioaddr + ALICNT);
		ep->stats.rx_crc_errors += inb(ioaddr + CRCCNT);
	}

	return &ep->stats;
}

/* Set or clear the multicast filter for this adaptor.
   Note that we only use exclusion around actually queueing the
   new frame, not around filling ep->setup_frame.  This is non-deterministic
   when re-entered but still correct. */

/* The little-endian AUTODIN II ethernet CRC calculation.
   N.B. Do not use for bulk data, use a table-based routine instead.
   This is common code and should be moved to net/core/crc.c */
static unsigned const ethernet_polynomial_le = 0xedb88320U;
static inline unsigned ether_crc_le(int length, unsigned char *data)
{
	unsigned int crc = 0xffffffff;	/* Initial value. */
	while(--length >= 0) {
		unsigned char current_octet = *data++;
		int bit;
		for (bit = 8; --bit >= 0; current_octet >>= 1) {
			if ((crc ^ current_octet) & 1) {
				crc >>= 1;
				crc ^= ethernet_polynomial_le;
			} else
				crc >>= 1;
		}
	}
	return crc;
}

static void set_rx_mode(struct net_device *dev)
{
	long ioaddr = dev->base_addr;
	struct epic_private *ep = (struct epic_private *)dev->priv;
	unsigned char mc_filter[8];		 /* Multicast hash filter */
	int i;

	if (dev->flags & IFF_PROMISC) {			/* Set promiscuous. */
		outl(0x002C, ioaddr + RxCtrl);
		/* Unconditionally log net taps. */
		printk(KERN_INFO "%s: Promiscuous mode enabled.\n", dev->name);
		memset(mc_filter, 0xff, sizeof(mc_filter));
	} else if ((dev->mc_count > 0)  ||  (dev->flags & IFF_ALLMULTI)) {
		/* There is apparently a chip bug, so the multicast filter
		   is never enabled. */
		/* Too many to filter perfectly -- accept all multicasts. */
		memset(mc_filter, 0xff, sizeof(mc_filter));
		outl(0x000C, ioaddr + RxCtrl);
	} else if (dev->mc_count == 0) {
		outl(0x0004, ioaddr + RxCtrl);
		return;
	} else {					/* Never executed, for now. */
		struct dev_mc_list *mclist;

		memset(mc_filter, 0, sizeof(mc_filter));
		for (i = 0, mclist = dev->mc_list; mclist && i < dev->mc_count;
			 i++, mclist = mclist->next)
			set_bit(ether_crc_le(ETH_ALEN, mclist->dmi_addr) & 0x3f,
					mc_filter);
	}
	/* ToDo: perhaps we need to stop the Tx and Rx process here? */
	if (memcmp(mc_filter, ep->mc_filter, sizeof(mc_filter))) {
		for (i = 0; i < 4; i++)
			outw(((u16 *)mc_filter)[i], ioaddr + MC0 + i*4);
		memcpy(ep->mc_filter, mc_filter, sizeof(mc_filter));
	}
	return;
}

static int mii_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
	long ioaddr = dev->base_addr;
	u16 *data = (u16 *)&rq->ifr_data;

	switch(cmd) {
	case SIOCDEVPRIVATE:		/* Get the address of the PHY in use. */
		data[0] = ((struct epic_private *)dev->priv)->phys[0] & 0x1f;
		/* Fall Through */
	case SIOCDEVPRIVATE+1:		/* Read the specified MII register. */
		if (! netif_running(dev)) {
			outl(0x0200, ioaddr + GENCTL);
			outl((inl(ioaddr + NVCTL) & ~0x003C) | 0x4800, ioaddr + NVCTL);
		}
		data[3] = mdio_read(ioaddr, data[0] & 0x1f, data[1] & 0x1f);
		if (! netif_running(dev)) {
#ifdef notdef					/* Leave on if the ioctl() is used. */
			outl(0x0008, ioaddr + GENCTL);
			outl((inl(ioaddr + NVCTL) & ~0x483C) | 0x0000, ioaddr + NVCTL);
#endif
		}
		return 0;
	case SIOCDEVPRIVATE+2:		/* Write the specified MII register */
		if (!capable(CAP_NET_ADMIN))
			return -EPERM;
		if (! netif_running(dev)) {
			outl(0x0200, ioaddr + GENCTL);
			outl((inl(ioaddr + NVCTL) & ~0x003C) | 0x4800, ioaddr + NVCTL);
		}
		mdio_write(ioaddr, data[0] & 0x1f, data[1] & 0x1f, data[2]);
		if (! netif_running(dev)) {
#ifdef notdef					/* Leave on if the ioctl() is used. */
			outl(0x0008, ioaddr + GENCTL);
			outl((inl(ioaddr + NVCTL) & ~0x483C) | 0x0000, ioaddr + NVCTL);
#endif
		}
		return 0;
	default:
		return -EOPNOTSUPP;
	}
}


static void __devexit epic_remove_one (struct pci_dev *pdev)
{
	struct net_device *dev = pdev->driver_data;
	
	unregister_netdev(dev);
#ifndef USE_IO_OPS
	iounmap ((void*) dev->base_addr);
#endif
	release_mem_region (pci_resource_start (pdev, 1),
			    pci_resource_len (pdev, 1));
	release_region (pci_resource_start (pdev, 0),
			pci_resource_len (pdev, 0));
	kfree(dev);
}


static void epic_suspend (struct pci_dev *pdev)
{
	struct net_device *dev = pdev->driver_data;
	long ioaddr = dev->base_addr;

	epic_pause(dev);
	/* Put the chip into low-power mode. */
	outl(0x0008, ioaddr + GENCTL);
}


static void epic_resume (struct pci_dev *pdev)
{
	struct net_device *dev = pdev->driver_data;

	epic_restart (dev);
}


static struct pci_driver epic_driver = {
	name:		"epic100",
	id_table:	epic_pci_tbl,
	probe:		epic_init_one,
	remove:		epic_remove_one,
	suspend:	epic_suspend,
	resume:		epic_resume,
};


static int __init epic_init (void)
{
	return pci_module_init (&epic_driver);
}


static void __exit epic_cleanup (void)
{
	pci_unregister_driver (&epic_driver);
}


module_init(epic_init);
module_exit(epic_cleanup);