au1000_eth.c

	/* stop the device */
	netif_stop_queue(dev);

	/* disable the interrupt */
	free_irq(dev->irq, dev);
	spin_unlock_irqrestore(&aup->lock, flags);

	return 0;
}

static void __exit au1000_cleanup_module(void)
{
	int i, j;
	struct net_device *dev;
	struct au1000_private *aup;

	for (i = 0; i < num_ifs; i++) {
		dev = iflist[i].dev;
		if (dev) {
			aup = (struct au1000_private *) dev->priv;
			unregister_netdev(dev);
			for (j = 0; j < NUM_RX_DMA; j++)
				if (aup->rx_db_inuse[j])
					ReleaseDB(aup, aup->rx_db_inuse[j]);
			for (j = 0; j < NUM_TX_DMA; j++)
				if (aup->tx_db_inuse[j])
					ReleaseDB(aup, aup->tx_db_inuse[j]);
 			dma_free_noncoherent(NULL, MAX_BUF_SIZE *
 					     (NUM_TX_BUFFS + NUM_RX_BUFFS),
 					     (void *)aup->vaddr, aup->dma_addr);
 			release_mem_region(dev->base_addr, MAC_IOSIZE);
 			release_mem_region(CPHYSADDR(iflist[i].macen_addr), 4);
			free_netdev(dev);
		}
	}
}

static void update_tx_stats(struct net_device *dev, u32 status)
{
	struct au1000_private *aup = (struct au1000_private *) dev->priv;
	struct net_device_stats *ps = &aup->stats;

	if (status & TX_FRAME_ABORTED) {
		if (!aup->phy_dev || (DUPLEX_FULL == aup->phy_dev->duplex)) {
			if (status & (TX_JAB_TIMEOUT | TX_UNDERRUN)) {
				/* any other tx errors are only valid
				 * in half duplex mode */
				ps->tx_errors++;
				ps->tx_aborted_errors++;
			}
		}
		else {
			ps->tx_errors++;
			ps->tx_aborted_errors++;
			if (status & (TX_NO_CARRIER | TX_LOSS_CARRIER))
				ps->tx_carrier_errors++;
		}
	}
}


/*
 * Called from the interrupt service routine to acknowledge
 * the TX DONE bits.  This is a must if the irq is setup as
 * edge triggered.
 */
static void au1000_tx_ack(struct net_device *dev)
{
	struct au1000_private *aup = (struct au1000_private *) dev->priv;
	volatile tx_dma_t *ptxd;

	ptxd = aup->tx_dma_ring[aup->tx_tail];

	while (ptxd->buff_stat & TX_T_DONE) {
		update_tx_stats(dev, ptxd->status);
		ptxd->buff_stat &= ~TX_T_DONE;
		ptxd->len = 0;
		au_sync();

		aup->tx_tail = (aup->tx_tail + 1) & (NUM_TX_DMA - 1);
		ptxd = aup->tx_dma_ring[aup->tx_tail];

		if (aup->tx_full) {
			aup->tx_full = 0;
			netif_wake_queue(dev);
		}
	}
}


/*
 * Au1000 transmit routine.
 */
static int au1000_tx(struct sk_buff *skb, struct net_device *dev)
{
	struct au1000_private *aup = (struct au1000_private *) dev->priv;
	struct net_device_stats *ps = &aup->stats;
	volatile tx_dma_t *ptxd;
	u32 buff_stat;
	db_dest_t *pDB;
	int i;

	if (au1000_debug > 5)
		printk("%s: tx: aup %x len=%d, data=%p, head %d\n", 
				dev->name, (unsigned)aup, skb->len, 
				skb->data, aup->tx_head);

	ptxd = aup->tx_dma_ring[aup->tx_head];
	buff_stat = ptxd->buff_stat;
	if (buff_stat & TX_DMA_ENABLE) {
		/* We've wrapped around and the transmitter is still busy */
		netif_stop_queue(dev);
		aup->tx_full = 1;
		return 1;
	}
	else if (buff_stat & TX_T_DONE) {
		update_tx_stats(dev, ptxd->status);
		ptxd->len = 0;
	}

	if (aup->tx_full) {
		aup->tx_full = 0;
		netif_wake_queue(dev);
	}

	pDB = aup->tx_db_inuse[aup->tx_head];
	memcpy((void *)pDB->vaddr, skb->data, skb->len);
	if (skb->len < ETH_ZLEN) {
		for (i=skb->len; i<ETH_ZLEN; i++) { 
			((char *)pDB->vaddr)[i] = 0;
		}
		ptxd->len = ETH_ZLEN;
	}
	else
		ptxd->len = skb->len;

	ps->tx_packets++;
	ps->tx_bytes += ptxd->len;

	ptxd->buff_stat = pDB->dma_addr | TX_DMA_ENABLE;
	au_sync();
	dev_kfree_skb(skb);
	aup->tx_head = (aup->tx_head + 1) & (NUM_TX_DMA - 1);
	dev->trans_start = jiffies;
	return 0;
}

static inline void update_rx_stats(struct net_device *dev, u32 status)
{
	struct au1000_private *aup = (struct au1000_private *) dev->priv;
	struct net_device_stats *ps = &aup->stats;

	ps->rx_packets++;
	if (status & RX_MCAST_FRAME)
		ps->multicast++;

	if (status & RX_ERROR) {
		ps->rx_errors++;
		if (status & RX_MISSED_FRAME)
			ps->rx_missed_errors++;
		if (status & (RX_OVERLEN | RX_OVERLEN | RX_LEN_ERROR))
			ps->rx_length_errors++;
		if (status & RX_CRC_ERROR)
			ps->rx_crc_errors++;
		if (status & RX_COLL)
			ps->collisions++;
	}
	else 
		ps->rx_bytes += status & RX_FRAME_LEN_MASK;

}

/*
 * Au1000 receive routine.
 */
static int au1000_rx(struct net_device *dev)
{
	struct au1000_private *aup = (struct au1000_private *) dev->priv;
	struct sk_buff *skb;
	volatile rx_dma_t *prxd;
	u32 buff_stat, status;
	db_dest_t *pDB;
	u32	frmlen;

	if (au1000_debug > 5)
		printk("%s: au1000_rx head %d\n", dev->name, aup->rx_head);

	prxd = aup->rx_dma_ring[aup->rx_head];
	buff_stat = prxd->buff_stat;
	while (buff_stat & RX_T_DONE)  {
		status = prxd->status;
		pDB = aup->rx_db_inuse[aup->rx_head];
		update_rx_stats(dev, status);
		if (!(status & RX_ERROR))  {

			/* good frame */
			frmlen = (status & RX_FRAME_LEN_MASK);
			frmlen -= 4; /* Remove FCS */
			skb = dev_alloc_skb(frmlen + 2);
			if (skb == NULL) {
				printk(KERN_ERR
				       "%s: Memory squeeze, dropping packet.\n",
				       dev->name);
				aup->stats.rx_dropped++;
				continue;
			}
			skb->dev = dev;
			skb_reserve(skb, 2);	/* 16 byte IP header align */
			eth_copy_and_sum(skb,
				(unsigned char *)pDB->vaddr, frmlen, 0);
			skb_put(skb, frmlen);
			skb->protocol = eth_type_trans(skb, dev);
			netif_rx(skb);	/* pass the packet to upper layers */
		}
		else {
			if (au1000_debug > 4) {
				if (status & RX_MISSED_FRAME) 
					printk("rx miss\n");
				if (status & RX_WDOG_TIMER) 
					printk("rx wdog\n");
				if (status & RX_RUNT) 
					printk("rx runt\n");
				if (status & RX_OVERLEN) 
					printk("rx overlen\n");
				if (status & RX_COLL)
					printk("rx coll\n");
				if (status & RX_MII_ERROR)
					printk("rx mii error\n");
				if (status & RX_CRC_ERROR)
					printk("rx crc error\n");
				if (status & RX_LEN_ERROR)
					printk("rx len error\n");
				if (status & RX_U_CNTRL_FRAME)
					printk("rx u control frame\n");
				if (status & RX_MISSED_FRAME)
					printk("rx miss\n");
			}
		}
		prxd->buff_stat = (u32)(pDB->dma_addr | RX_DMA_ENABLE);
		aup->rx_head = (aup->rx_head + 1) & (NUM_RX_DMA - 1);
		au_sync();

		/* next descriptor */
		prxd = aup->rx_dma_ring[aup->rx_head];
		buff_stat = prxd->buff_stat;
		dev->last_rx = jiffies;
	}
	return 0;
}


/*
 * Au1000 interrupt service routine.
 */
static irqreturn_t au1000_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
	struct net_device *dev = (struct net_device *) dev_id;

	if (dev == NULL) {
		printk(KERN_ERR "%s: isr: null dev ptr\n", dev->name);
		return IRQ_RETVAL(1);
	}

	/* Handle RX interrupts first to minimize chance of overrun */

	au1000_rx(dev);
	au1000_tx_ack(dev);
	return IRQ_RETVAL(1);
}


/*
 * The Tx ring has been full longer than the watchdog timeout
 * value. The transmitter must be hung?
 */
static void au1000_tx_timeout(struct net_device *dev)
{
	printk(KERN_ERR "%s: au1000_tx_timeout: dev=%p\n", dev->name, dev);
	reset_mac(dev);
	au1000_init(dev);
	dev->trans_start = jiffies;
	netif_wake_queue(dev);
}

static void set_rx_mode(struct net_device *dev)
{
	struct au1000_private *aup = (struct au1000_private *) dev->priv;

	if (au1000_debug > 4) 
		printk("%s: set_rx_mode: flags=%x\n", dev->name, dev->flags);

	if (dev->flags & IFF_PROMISC) {			/* Set promiscuous. */
		aup->mac->control |= MAC_PROMISCUOUS;
	} else if ((dev->flags & IFF_ALLMULTI)  ||
			   dev->mc_count > MULTICAST_FILTER_LIMIT) {
		aup->mac->control |= MAC_PASS_ALL_MULTI;
		aup->mac->control &= ~MAC_PROMISCUOUS;
		printk(KERN_INFO "%s: Pass all multicast\n", dev->name);
	} else {
		int i;
		struct dev_mc_list *mclist;
		u32 mc_filter[2];	/* Multicast hash filter */

		mc_filter[1] = mc_filter[0] = 0;
		for (i = 0, mclist = dev->mc_list; mclist && i < dev->mc_count;
			 i++, mclist = mclist->next) {
			set_bit(ether_crc(ETH_ALEN, mclist->dmi_addr)>>26, 
					(long *)mc_filter);
		}
		aup->mac->multi_hash_high = mc_filter[1];
		aup->mac->multi_hash_low = mc_filter[0];
		aup->mac->control &= ~MAC_PROMISCUOUS;
		aup->mac->control |= MAC_HASH_MODE;
	}
}

static int au1000_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
	struct au1000_private *aup = (struct au1000_private *)dev->priv;

	if (!netif_running(dev)) return -EINVAL;

	if (!aup->phy_dev) return -EINVAL; // PHY not controllable

	return phy_mii_ioctl(aup->phy_dev, if_mii(rq), cmd);
}

static struct net_device_stats *au1000_get_stats(struct net_device *dev)
{
	struct au1000_private *aup = (struct au1000_private *) dev->priv;

	if (au1000_debug > 4)
		printk("%s: au1000_get_stats: dev=%p\n", dev->name, dev);

	if (netif_device_present(dev)) {
		return &aup->stats;
	}
	return 0;
}

module_init(au1000_init_module);
module_exit(au1000_cleanup_module);