epic100.c

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			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 {
				pci_unmap_single(ep->pci_dev, 
					ep->rx_ring[entry].bufaddr, 
					ep->rx_buf_sz, PCI_DMA_FROMDEVICE);
				skb_put(skb = ep->rx_skbuff[entry], pkt_len);
				ep->rx_skbuff[entry] = NULL;
			}
			skb->protocol = eth_type_trans(skb, dev);
			netif_rx(skb);
			dev->last_rx = jiffies;
			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 = pci_map_single(ep->pci_dev, 
				skb->tail, ep->rx_buf_sz, PCI_DMA_FROMDEVICE);
			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 = dev->priv;
	struct sk_buff *skb;
	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++) {
		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;
		if (skb) {
			pci_unmap_single(ep->pci_dev, ep->rx_ring[i].bufaddr, 
				 	 ep->rx_buf_sz, PCI_DMA_FROMDEVICE);
			dev_kfree_skb(skb);
		}
		ep->rx_ring[i].bufaddr = 0xBADF00D0; /* An invalid address. */
	}
	for (i = 0; i < TX_RING_SIZE; i++) {
		skb = ep->tx_skbuff[i];
		ep->tx_skbuff[i] = 0;
		if (!skb)
			continue;
		pci_unmap_single(ep->pci_dev, ep->tx_ring[i].bufaddr, 
				 skb->len, PCI_DMA_TODEVICE);
		dev_kfree_skb(skb);
	}

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

	return 0;
}

static struct net_device_stats *epic_get_stats(struct net_device *dev)
{
	struct epic_private *ep = 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 = 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 netdev_ethtool_ioctl (struct net_device *dev, void *useraddr)
{
	struct epic_private *np = dev->priv;
	u32 ethcmd;

	if (copy_from_user (&ethcmd, useraddr, sizeof (ethcmd)))
		return -EFAULT;

	switch (ethcmd) {
	case ETHTOOL_GDRVINFO: {
		struct ethtool_drvinfo info = { ETHTOOL_GDRVINFO };
		strcpy (info.driver, DRV_NAME);
		strcpy (info.version, DRV_VERSION);
		strcpy (info.bus_info, np->pci_dev->slot_name);
		if (copy_to_user (useraddr, &info, sizeof (info)))
			return -EFAULT;
		return 0;
	}

	/* get settings */
	case ETHTOOL_GSET: {
		struct ethtool_cmd ecmd = { ETHTOOL_GSET };
		spin_lock_irq(&np->lock);
		mii_ethtool_gset(&np->mii, &ecmd);
		spin_unlock_irq(&np->lock);
		if (copy_to_user(useraddr, &ecmd, sizeof(ecmd)))
			return -EFAULT;
		return 0;
	}
	/* set settings */
	case ETHTOOL_SSET: {
		int r;
		struct ethtool_cmd ecmd;
		if (copy_from_user(&ecmd, useraddr, sizeof(ecmd)))
			return -EFAULT;
		spin_lock_irq(&np->lock);
		r = mii_ethtool_sset(&np->mii, &ecmd);
		spin_unlock_irq(&np->lock);
		return r;
	}
	/* restart autonegotiation */
	case ETHTOOL_NWAY_RST: {
		return mii_nway_restart(&np->mii);
	}
	/* get link status */
	case ETHTOOL_GLINK: {
		struct ethtool_value edata = {ETHTOOL_GLINK};
		edata.data = mii_link_ok(&np->mii);
		if (copy_to_user(useraddr, &edata, sizeof(edata)))
			return -EFAULT;
		return 0;
	}

	/* get message-level */
	case ETHTOOL_GMSGLVL: {
		struct ethtool_value edata = {ETHTOOL_GMSGLVL};
		edata.data = debug;
		if (copy_to_user(useraddr, &edata, sizeof(edata)))
			return -EFAULT;
		return 0;
	}
	/* set message-level */
	case ETHTOOL_SMSGLVL: {
		struct ethtool_value edata;
		if (copy_from_user(&edata, useraddr, sizeof(edata)))
			return -EFAULT;
		debug = edata.data;
		return 0;
	}
	default:
		break;
	}

	return -EOPNOTSUPP;
}

static int netdev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
	struct epic_private *ep = dev->priv;
	long ioaddr = dev->base_addr;
	struct mii_ioctl_data *data = (struct mii_ioctl_data *)&rq->ifr_data;

	switch(cmd) {
	case SIOCETHTOOL:
		return netdev_ethtool_ioctl(dev, (void *) rq->ifr_data);

	case SIOCGMIIPHY:		/* Get address of MII PHY in use. */
	case SIOCDEVPRIVATE:		/* for binary compat, remove in 2.5 */
		data->phy_id = ep->phys[0] & 0x1f;
		/* Fall Through */

	case SIOCGMIIREG:		/* Read MII PHY register. */
	case SIOCDEVPRIVATE+1:		/* for binary compat, remove in 2.5 */
		if (! netif_running(dev)) {
			outl(0x0200, ioaddr + GENCTL);
			outl((inl(ioaddr + NVCTL) & ~0x003C) | 0x4800, ioaddr + NVCTL);
		}
		data->val_out = mdio_read(dev, data->phy_id & 0x1f, data->reg_num & 0x1f);
#if 0					/* Just leave on if the ioctl() is ever used. */
		if (! netif_running(dev)) {
			outl(0x0008, ioaddr + GENCTL);
			outl((inl(ioaddr + NVCTL) & ~0x483C) | 0x0000, ioaddr + NVCTL);
		}
#endif
		return 0;

	case SIOCSMIIREG:		/* Write MII PHY register. */
	case SIOCDEVPRIVATE+2:		/* for binary compat, remove in 2.5 */
		if (!capable(CAP_NET_ADMIN))
			return -EPERM;
		if (! netif_running(dev)) {
			outl(0x0200, ioaddr + GENCTL);
			outl((inl(ioaddr + NVCTL) & ~0x003C) | 0x4800, ioaddr + NVCTL);
		}
		if (data->phy_id == ep->phys[0]) {
			u16 value = data->val_in;
			switch (data->reg_num) {
			case 0:
				/* Check for autonegotiation on or reset. */
				ep->mii.duplex_lock = (value & 0x9000) ? 0 : 1;
				if (ep->mii.duplex_lock)
					ep->mii.full_duplex = (value & 0x0100) ? 1 : 0;
				break;
			case 4: ep->mii.advertising = value; break;
			}
			/* Perhaps check_duplex(dev), depending on chip semantics. */
		}
		mdio_write(dev, data->phy_id & 0x1f, data->reg_num & 0x1f, data->val_in);
#if 0					/* Leave on if the ioctl() is used. */
		if (! netif_running(dev)) {
			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 = pci_get_drvdata(pdev);
	struct epic_private *ep = dev->priv;
	
	pci_free_consistent(pdev, TX_TOTAL_SIZE, ep->tx_ring, ep->tx_ring_dma);
	pci_free_consistent(pdev, RX_TOTAL_SIZE, ep->rx_ring, ep->rx_ring_dma);
	unregister_netdev(dev);
#ifndef USE_IO_OPS
	iounmap((void*) dev->base_addr);
#endif
	pci_release_regions(pdev);
	kfree(dev);
	pci_set_drvdata(pdev, NULL);
	/* pci_power_off(pdev, -1); */
}


#ifdef CONFIG_PM

static int epic_suspend (struct pci_dev *pdev, u32 state)
{
	struct net_device *dev = pci_get_drvdata(pdev);
	long ioaddr = dev->base_addr;

	if (!netif_running(dev))
		return 0;
	epic_pause(dev);
	/* Put the chip into low-power mode. */
	outl(0x0008, ioaddr + GENCTL);
	/* pci_power_off(pdev, -1); */
	return 0;
}


static int epic_resume (struct pci_dev *pdev)
{
	struct net_device *dev = pci_get_drvdata(pdev);

	if (!netif_running(dev))
		return 0;
	epic_restart(dev);
	/* pci_power_on(pdev); */
	return 0;
}

#endif /* CONFIG_PM */


static struct pci_driver epic_driver = {
	name:		DRV_NAME,
	id_table:	epic_pci_tbl,
	probe:		epic_init_one,
	remove:		__devexit_p(epic_remove_one),
#ifdef CONFIG_PM
	suspend:	epic_suspend,
	resume:		epic_resume,
#endif /* CONFIG_PM */
};


static int __init epic_init (void)
{
/* when a module, this is printed whether or not devices are found in probe */
#ifdef MODULE
	printk (KERN_INFO "%s" KERN_INFO "%s" KERN_INFO "%s",
		version, version2, version3);
#endif

	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);