sundance.c

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							  IntrDrvRqst |IntrTxDone|IntrTxDMADone |
							  StatsMax | LinkChange),
							  ioaddr + IntrStatus);

		if (debug > 4)
			printk(KERN_DEBUG "%s: Interrupt, status %4.4x.\n",
				   dev->name, intr_status);

		if (intr_status == 0)
			break;

		if (intr_status & (IntrRxDone|IntrRxDMADone))
			netdev_rx(dev);

		if (intr_status & IntrTxDone) {
			int boguscnt = 32;
			int tx_status = readw(ioaddr + TxStatus);
			while (tx_status & 0x80) {
				if (debug > 4)
					printk("%s: Transmit status is %2.2x.\n",
						   dev->name, tx_status);
				if (tx_status & 0x1e) {
					np->stats.tx_errors++;
					if (tx_status & 0x10)  np->stats.tx_fifo_errors++;
#ifdef ETHER_STATS
					if (tx_status & 0x08)  np->stats.collisions16++;
#else
					if (tx_status & 0x08)  np->stats.collisions++;
#endif
					if (tx_status & 0x04)  np->stats.tx_fifo_errors++;
					if (tx_status & 0x02)  np->stats.tx_window_errors++;
					/* This reset has not been verified!. */
					if (tx_status & 0x10) {			/* Reset the Tx. */
						writew(0x001c, ioaddr + ASICCtrl + 2);
#if 0					/* Do we need to reset the Tx pointer here? */
						writel(virt_to_bus(&np->tx_ring[np->dirty_tx]),
							   dev->base_addr + TxListPtr);
#endif
					}
					if (tx_status & 0x1e) 		/* Restart the Tx. */
						writew(TxEnable, ioaddr + MACCtrl1);
				}
				/* Yup, this is a documentation bug.  It cost me *hours*. */
				writew(0, ioaddr + TxStatus);
				tx_status = readb(ioaddr + TxStatus);
				if (--boguscnt < 0)
					break;
			}
		}
		for (; np->cur_tx - np->dirty_tx > 0; np->dirty_tx++) {
			int entry = np->dirty_tx % TX_RING_SIZE;
			if ( ! (np->tx_ring[entry].status & 0x00010000))
				break;
			/* Free the original skb. */
			dev_kfree_skb_irq(np->tx_skbuff[entry]);
			np->tx_skbuff[entry] = 0;
		}
		if (np->tx_full
			&& np->cur_tx - np->dirty_tx < TX_QUEUE_LEN - 4) {
			/* The ring is no longer full, clear tbusy. */
			np->tx_full = 0;
			netif_wake_queue(dev);
		}

		/* Abnormal error summary/uncommon events handlers. */
		if (intr_status & (IntrDrvRqst | IntrPCIErr | LinkChange | StatsMax))
			netdev_error(dev, intr_status);

		if (--boguscnt < 0) {
			get_stats(dev);
			printk(KERN_WARNING "%s: Too much work at interrupt, "
				   "status=0x%4.4x / 0x%4.4x.\n",
				   dev->name, intr_status, readw(ioaddr + IntrClear));
			/* Re-enable us in 3.2msec. */
			writew(1000, ioaddr + DownCounter);
			writew(IntrDrvRqst, ioaddr + IntrEnable);
			break;
		}
	} while (1);

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

	spin_unlock(&np->lock);
}

/* This routine is logically part of the interrupt handler, but separated
   for clarity and better register allocation. */
static int netdev_rx(struct net_device *dev)
{
	struct netdev_private *np = (struct netdev_private *)dev->priv;
	int entry = np->cur_rx % RX_RING_SIZE;
	int boguscnt = np->dirty_rx + RX_RING_SIZE - np->cur_rx;

	if (debug > 4) {
		printk(KERN_DEBUG " In netdev_rx(), entry %d status %4.4x.\n",
			   entry, np->rx_ring[entry].status);
	}

	/* If EOP is set on the next entry, it's a new packet. Send it up. */
	while (np->rx_head_desc->status & DescOwn) {
		struct netdev_desc *desc = np->rx_head_desc;
		u32 frame_status = le32_to_cpu(desc->status);
		int pkt_len = frame_status & 0x1fff;		/* Chip omits the CRC. */

		if (debug > 4)
			printk(KERN_DEBUG "  netdev_rx() status was %8.8x.\n",
				   frame_status);
		if (--boguscnt < 0)
			break;
		if (frame_status & 0x001f4000) {
			/* There was a error. */
			if (debug > 2)
				printk(KERN_DEBUG "  netdev_rx() Rx error was %8.8x.\n",
					   frame_status);
			np->stats.rx_errors++;
			if (frame_status & 0x00100000) np->stats.rx_length_errors++;
			if (frame_status & 0x00010000) np->stats.rx_fifo_errors++;
			if (frame_status & 0x00060000) np->stats.rx_frame_errors++;
			if (frame_status & 0x00080000) np->stats.rx_crc_errors++;
			if (frame_status & 0x00100000) {
				printk(KERN_WARNING "%s: Oversized Ethernet frame,"
					   " status %8.8x.\n",
					   dev->name, frame_status);
			}
		} else {
			struct sk_buff *skb;

#ifndef final_version
			if (debug > 4)
				printk(KERN_DEBUG "  netdev_rx() normal Rx pkt length %d"
					   ", bogus_cnt %d.\n",
					   pkt_len, boguscnt);
#endif
			/* 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 */
				eth_copy_and_sum(skb, np->rx_skbuff[entry]->tail, pkt_len, 0);
				skb_put(skb, pkt_len);
			} else {
				skb_put(skb = np->rx_skbuff[entry], pkt_len);
				np->rx_skbuff[entry] = NULL;
			}
			skb->protocol = eth_type_trans(skb, dev);
			/* Note: checksum -> skb->ip_summed = CHECKSUM_UNNECESSARY; */
			netif_rx(skb);
			dev->last_rx = jiffies;
		}
		entry = (++np->cur_rx) % RX_RING_SIZE;
		np->rx_head_desc = &np->rx_ring[entry];
	}

	/* Refill the Rx ring buffers. */
	for (; np->cur_rx - np->dirty_rx > 0; np->dirty_rx++) {
		struct sk_buff *skb;
		entry = np->dirty_rx % RX_RING_SIZE;
		if (np->rx_skbuff[entry] == NULL) {
			skb = dev_alloc_skb(np->rx_buf_sz);
			np->rx_skbuff[entry] = skb;
			if (skb == NULL)
				break;				/* Better luck next round. */
			skb->dev = dev;			/* Mark as being used by this device. */
			skb_reserve(skb, 2);	/* Align IP on 16 byte boundaries */
			np->rx_ring[entry].frag[0].addr = virt_to_le32desc(skb->tail);
		}
		/* Perhaps we need not reset this field. */
		np->rx_ring[entry].frag[0].length =
			cpu_to_le32(np->rx_buf_sz | LastFrag);
		np->rx_ring[entry].status = 0;
	}

	/* No need to restart Rx engine, it will poll. */
	return 0;
}

static void netdev_error(struct net_device *dev, int intr_status)
{
	long ioaddr = dev->base_addr;
	struct netdev_private *np = (struct netdev_private *)dev->priv;

	if (intr_status & IntrDrvRqst) {
		/* Stop the down counter and turn interrupts back on. */
		printk("%s: Turning interrupts back on.\n", dev->name);
		writew(0, ioaddr + DownCounter);
		writew(IntrRxDone | IntrRxDMADone | IntrPCIErr | IntrDrvRqst |
			   IntrTxDone | StatsMax | LinkChange, ioaddr + IntrEnable);
	}
	if (intr_status & LinkChange) {
		printk(KERN_ERR "%s: Link changed: Autonegotiation advertising"
			   " %4.4x  partner %4.4x.\n", dev->name,
			   mdio_read(dev, np->phys[0], 4),
			   mdio_read(dev, np->phys[0], 5));
		check_duplex(dev);
	}
	if (intr_status & StatsMax) {
		get_stats(dev);
	}
	if (intr_status & IntrPCIErr) {
		printk(KERN_ERR "%s: Something Wicked happened! %4.4x.\n",
			   dev->name, intr_status);
		/* We must do a global reset of DMA to continue. */
	}
}

static struct net_device_stats *get_stats(struct net_device *dev)
{
	long ioaddr = dev->base_addr;
	struct netdev_private *np = (struct netdev_private *)dev->priv;
	int i;

	/* We should lock this segment of code for SMP eventually, although
	   the vulnerability window is very small and statistics are
	   non-critical. */
	/* The chip only need report frame silently dropped. */
	np->stats.rx_missed_errors	+= readb(ioaddr + RxMissed);
	np->stats.tx_packets += readw(ioaddr + TxFramesOK);
	np->stats.rx_packets += readw(ioaddr + RxFramesOK);
	np->stats.collisions += readb(ioaddr + StatsLateColl);
	np->stats.collisions += readb(ioaddr + StatsMultiColl);
	np->stats.collisions += readb(ioaddr + StatsOneColl);
	readb(ioaddr + StatsCarrierError);
	readb(ioaddr + StatsTxDefer);
	for (i = StatsTxDefer; i <= StatsMcastRx; i++)
		readb(ioaddr + i);
	np->stats.tx_bytes += readw(ioaddr + TxOctetsLow);
	np->stats.tx_bytes += readw(ioaddr + TxOctetsHigh) << 16;
	np->stats.rx_bytes += readw(ioaddr + RxOctetsLow);
	np->stats.rx_bytes += readw(ioaddr + RxOctetsHigh) << 16;

	return &np->stats;
}

/* The little-endian AUTODIN II ethernet CRC calculations.
   A big-endian version is also available.
   This is slow but compact code.  Do not use this routine for bulk data,
   use a table-based routine instead.
   This is common code and should be moved to net/core/crc.c.
   Chips may use the upper or lower CRC bits, and may reverse and/or invert
   them.  Select the endian-ness that results in minimal calculations.
*/
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;
	u16 mc_filter[4];			/* Multicast hash filter */
	u32 rx_mode;
	int i;

	if (dev->flags & IFF_PROMISC) {			/* Set promiscuous. */
		/* Unconditionally log net taps. */
		printk(KERN_NOTICE "%s: Promiscuous mode enabled.\n", dev->name);
		memset(mc_filter, 0xff, sizeof(mc_filter));
		rx_mode = AcceptBroadcast | AcceptMulticast | AcceptAll | AcceptMyPhys;
	} else if ((dev->mc_count > multicast_filter_limit)
			   ||  (dev->flags & IFF_ALLMULTI)) {
		/* Too many to match, or accept all multicasts. */
		memset(mc_filter, 0xff, sizeof(mc_filter));
		rx_mode = AcceptBroadcast | AcceptMulticast | AcceptMyPhys;
	} else if (dev->mc_count) {
		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);
		}
		rx_mode = AcceptBroadcast | AcceptMultiHash | AcceptMyPhys;
	} else {
		writeb(AcceptBroadcast | AcceptMyPhys, ioaddr + RxMode);
		return;
	}
	for (i = 0; i < 4; i++)
		writew(mc_filter[i], ioaddr + MulticastFilter0 + i*2);
	writeb(rx_mode, ioaddr + RxMode);
}

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

	switch(cmd) {
	case SIOCDEVPRIVATE:		/* Get the address of the PHY in use. */
		data[0] = ((struct netdev_private *)dev->priv)->phys[0] & 0x1f;
		/* Fall Through */
	case SIOCDEVPRIVATE+1:		/* Read the specified MII register. */
		data[3] = mdio_read(dev, data[0] & 0x1f, data[1] & 0x1f);
		return 0;
	case SIOCDEVPRIVATE+2:		/* Write the specified MII register */
		if (!capable(CAP_NET_ADMIN))
			return -EPERM;
		mdio_write(dev, data[0] & 0x1f, data[1] & 0x1f, data[2]);
		return 0;
	default:
		return -EOPNOTSUPP;
	}
}

static int netdev_close(struct net_device *dev)
{
	long ioaddr = dev->base_addr;
	struct netdev_private *np = (struct netdev_private *)dev->priv;
	int i;

	netif_stop_queue(dev);

	if (debug > 1) {
		printk(KERN_DEBUG "%s: Shutting down ethercard, status was Tx %2.2x "
			   "Rx %4.4x Int %2.2x.\n",
			   dev->name, readb(ioaddr + TxStatus),
			   readl(ioaddr + RxStatus), readw(ioaddr + IntrStatus));
		printk(KERN_DEBUG "%s: Queue pointers were Tx %d / %d,  Rx %d / %d.\n",
			   dev->name, np->cur_tx, np->dirty_tx, np->cur_rx, np->dirty_rx);
	}

	/* Disable interrupts by clearing the interrupt mask. */
	writew(0x0000, ioaddr + IntrEnable);

	/* Stop the chip's Tx and Rx processes. */
	writew(TxDisable | RxDisable | StatsDisable, ioaddr + MACCtrl1);

#ifdef __i386__
	if (debug > 2) {
		printk("\n"KERN_DEBUG"  Tx ring at %8.8x:\n",
			   (int)virt_to_bus(np->tx_ring));
		for (i = 0; i < TX_RING_SIZE; i++)
			printk(" #%d desc. %4.4x %8.8x %8.8x.\n",
				   i, np->tx_ring[i].status, np->tx_ring[i].frag[0].addr,
				   np->tx_ring[i].frag[0].length);
		printk("\n"KERN_DEBUG "  Rx ring %8.8x:\n",
			   (int)virt_to_bus(np->rx_ring));
		for (i = 0; i < /*RX_RING_SIZE*/4 ; i++) {
			printk(KERN_DEBUG " #%d desc. %4.4x %4.4x %8.8x\n",
				   i, np->rx_ring[i].status, np->rx_ring[i].frag[0].addr,
				   np->rx_ring[i].frag[0].length);
		}
	}
#endif /* __i386__ debugging only */

	free_irq(dev->irq, dev);

	del_timer_sync(&np->timer);

	/* Free all the skbuffs in the Rx queue. */
	for (i = 0; i < RX_RING_SIZE; i++) {
		np->rx_ring[i].status = 0;
		np->rx_ring[i].frag[0].addr = 0xBADF00D0; /* An invalid address. */
		if (np->rx_skbuff[i]) {
			dev_kfree_skb(np->rx_skbuff[i]);
		}
		np->rx_skbuff[i] = 0;
	}
	for (i = 0; i < TX_RING_SIZE; i++) {
		if (np->tx_skbuff[i])
			dev_kfree_skb(np->tx_skbuff[i]);
		np->tx_skbuff[i] = 0;
	}

	return 0;
}

static void __devexit sundance_remove1 (struct pci_dev *pdev)
{
	struct net_device *dev = pdev->driver_data;
	
	/* No need to check MOD_IN_USE, as sys_delete_module() checks. */
	while (dev) {
		struct netdev_private *np = (void *)(dev->priv);
		unregister_netdev(dev);
#ifdef USE_IO_OPS
		release_region(dev->base_addr, pci_id_tbl[np->chip_id].io_size);
#else
		release_mem_region(pci_resource_start(pdev, 1),
				   pci_id_tbl[np->chip_id].io_size);
		iounmap((char *)(dev->base_addr));
#endif
		kfree(dev);
	}

	pdev->driver_data = NULL;
}

static struct pci_driver sundance_driver = {
	name:		"sundance",
	id_table:	sundance_pci_tbl,
	probe:		sundance_probe1,
	remove:		sundance_remove1,
};

static int __init sundance_init(void)
{
	return pci_module_init(&sundance_driver);
}

static void __exit sundance_exit(void)
{
	pci_unregister_driver(&sundance_driver);
}

module_init(sundance_init);
module_exit(sundance_exit);