winbond-840.c

Linux下各种网卡的驱动程序

#if HAS_IP_COPYSUM
				eth_copy_and_sum(skb, np->rx_skbuff[entry]->tail, pkt_len, 0);
				skb_put(skb, pkt_len);
#else
				memcpy(skb_put(skb, pkt_len), np->rx_skbuff[entry]->tail,
					   pkt_len);
#endif
			} else {
				char *temp = skb_put(skb = np->rx_skbuff[entry], pkt_len);
				np->rx_skbuff[entry] = NULL;
#ifndef final_version				/* Remove after testing. */
				if (bus_to_virt(desc->buffer1) != temp)
					printk(KERN_ERR "%s: Internal fault: The skbuff addresses "
						   "do not match in netdev_rx: %p vs. %p / %p.\n",
						   dev->name, bus_to_virt(desc->buffer1),
						   skb->head, temp);
#endif
			}
			skb->protocol = eth_type_trans(skb, dev);
			netif_rx(skb);
			dev->last_rx = jiffies;
			np->stats.rx_packets++;
#if LINUX_VERSION_CODE > 0x20127
			np->stats.rx_bytes += pkt_len;
#endif
		}
		entry = (++np->cur_rx) % np->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 % np->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. */
			np->rx_ring[entry].buffer1 = virt_to_bus(skb->tail);
		}
		np->rx_ring[entry].status = DescOwn;
	}

	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 (np->msg_level & NETIF_MSG_MISC)
		printk(KERN_DEBUG "%s: Abnormal event, %8.8x.\n",
			   dev->name, intr_status);
	if (intr_status == 0xffffffff)
		return;
	if (intr_status & TxFIFOUnderflow) {
		np->csr6 += 0x4000;	/* Bump up the Tx threshold */
		if (np->msg_level & NETIF_MSG_TX_ERR)
			printk(KERN_DEBUG "%s: Tx underflow, increasing threshold to "
				   "%8.8x.\n", dev->name, np->csr6);
		writel(np->csr6, ioaddr + NetworkConfig);
	}
	if (intr_status & IntrRxDied) {		/* Missed a Rx frame. */
		np->stats.rx_errors++;
	}
	if (intr_status & TimerInt) {
		/* Re-enable other interrupts. */
		writel(0x1A0F5, ioaddr + IntrEnable);
	}
	np->stats.rx_missed_errors += readl(ioaddr + RxMissed) & 0xffff;
	writel(0, ioaddr + RxStartDemand);
}

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;

	/* The chip only need report frame silently dropped. */
	if (netif_running(dev))
		np->stats.rx_missed_errors += readl(ioaddr + RxMissed) & 0xffff;

	return &np->stats;
}

static unsigned const ethernet_polynomial = 0x04c11db7U;
static inline u32 ether_crc(int length, unsigned char *data)
{
    int crc = -1;

    while(--length >= 0) {
		unsigned char current_octet = *data++;
		int bit;
		for (bit = 0; bit < 8; bit++, current_octet >>= 1) {
			crc = (crc << 1) ^
				((crc < 0) ^ (current_octet & 1) ? ethernet_polynomial : 0);
		}
    }
    return crc;
}

static void set_rx_mode(struct net_device *dev)
{
	struct netdev_private *np = (struct netdev_private *)dev->priv;
	long ioaddr = dev->base_addr;
	u32 mc_filter[2];			/* Multicast hash filter */
	u32 rx_mode;

	if (dev->flags & IFF_PROMISC) {			/* Set promiscuous. */
		/* Unconditionally log net taps. */
		printk(KERN_NOTICE "%s: Promiscuous mode enabled.\n", dev->name);
		memset(mc_filter, ~0, sizeof(mc_filter));
		rx_mode = AcceptBroadcast | AcceptMulticast | AcceptAllPhys;
	} else if ((dev->mc_count > np->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;
	} else {
		struct dev_mc_list *mclist;
		int i;
		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(ETH_ALEN, mclist->dmi_addr) >> 26) ^ 0x3F,
					mc_filter);
		}
		rx_mode = AcceptBroadcast | AcceptMulticast;
	}
	writel(mc_filter[0], ioaddr + MulticastFilter0);
	writel(mc_filter[1], ioaddr + MulticastFilter1);
	np->csr6 &= ~0x00F8;
	np->csr6 |= rx_mode;
	writel(np->csr6, ioaddr + NetworkConfig);
}

static int mii_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
	struct netdev_private *np = (struct netdev_private *)dev->priv;
	u16 *data = (u16 *)&rq->ifr_data;
	u32 *data32 = (void *)&rq->ifr_data;

	switch(cmd) {
	case 0x8947: case 0x89F0:
		/* SIOCGMIIPHY: Get the address of the PHY in use. */
		data[0] = np->phys[0] & 0x1f;
		/* Fall Through */
	case 0x8948: case 0x89F1:
		/* SIOCGMIIREG: Read the specified MII register. */
		data[3] = mdio_read(dev, data[0] & 0x1f, data[1] & 0x1f);
		return 0;
	case 0x8949: case 0x89F2:
		/* SIOCSMIIREG: Write the specified MII register */
		if (!capable(CAP_NET_ADMIN))
			return -EPERM;
		if (data[0] == np->phys[0]) {
			u16 value = data[2];
			switch (data[1]) {
			case 0:
				/* Check for autonegotiation on or reset. */
				np->medialock = (value & 0x9000) ? 0 : 1;
				if (np->medialock)
					np->full_duplex = (value & 0x0100) ? 1 : 0;
				break;
			case 4: np->advertising = value; break;
			}
			/* Perhaps check_duplex(dev), depending on chip semantics. */
		}
		mdio_write(dev, data[0] & 0x1f, data[1] & 0x1f, data[2]);
		return 0;
	case SIOCGPARAMS:
		data32[0] = np->msg_level;
		data32[1] = np->multicast_filter_limit;
		data32[2] = np->max_interrupt_work;
		data32[3] = np->rx_copybreak;
		return 0;
	case SIOCSPARAMS:
		if (!capable(CAP_NET_ADMIN))
			return -EPERM;
		np->msg_level = data32[0];
		np->multicast_filter_limit = data32[1];
		np->max_interrupt_work = data32[2];
		np->rx_copybreak = data32[3];
		return 0;
	default:
		return -EOPNOTSUPP;
	}
}


static void empty_rings(struct net_device *dev)
{
	struct netdev_private *np = (void *)dev->priv;
	int i;

	/* Free all the skbuffs in the Rx queue. */
	for (i = 0; i < np->rx_ring_size; i++) {
		np->rx_ring[i].status = 0;
		if (np->rx_skbuff[i]) {
#if LINUX_VERSION_CODE < 0x20100
			np->rx_skbuff[i]->free = 1;
#endif
			dev_free_skb(np->rx_skbuff[i]);
		}
		np->rx_skbuff[i] = 0;
	}
	for (i = 0; i < np->tx_ring_size; i++) {
		if (np->tx_skbuff[i])
			dev_free_skb(np->tx_skbuff[i]);
		np->tx_skbuff[i] = 0;
	}
}

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

	netif_stop_tx_queue(dev);

	if (np->msg_level & NETIF_MSG_IFDOWN) {
		printk(KERN_DEBUG "%s: Shutting down ethercard, status was %8.8x "
			   "Config %8.8x.\n", dev->name, (int)readl(ioaddr + IntrStatus),
			   (int)readl(ioaddr + NetworkConfig));
		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. */
	writel(0x0000, ioaddr + IntrEnable);

	/* Stop the chip's Tx and Rx processes. */
	writel(np->csr6 &= ~0x20FA, ioaddr + NetworkConfig);

	del_timer(&np->timer);
	if (readl(ioaddr + NetworkConfig) != 0xffffffff)
		np->stats.rx_missed_errors += readl(ioaddr + RxMissed) & 0xffff;

#ifdef __i386__
	if (np->msg_level & NETIF_MSG_IFDOWN) {
		int i;
		printk("\n"KERN_DEBUG"  Tx ring at %8.8x:\n",
			   (int)virt_to_bus(np->tx_ring));
		for (i = 0; i < np->tx_ring_size; i++)
			printk(KERN_DEBUG " #%d desc. %4.4x %8.8x %8.8x.\n",
				   i, np->tx_ring[i].length,
				   np->tx_ring[i].status, np->tx_ring[i].buffer1);
		printk(KERN_DEBUG "\n" KERN_DEBUG "  Rx ring %8.8x:\n",
			   (int)virt_to_bus(np->rx_ring));
		for (i = 0; i < np->rx_ring_size; i++) {
			printk(KERN_DEBUG " #%d desc. %4.4x %4.4x %8.8x\n",
				   i, np->rx_ring[i].length,
				   np->rx_ring[i].status, np->rx_ring[i].buffer1);
		}
	}
#endif /* __i386__ debugging only */

	free_irq(dev->irq, dev);
	empty_rings(dev);

	MOD_DEC_USE_COUNT;

	return 0;
}

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

	if (np->msg_level & NETIF_MSG_LINK)
		printk(KERN_DEBUG "%s: Handling power event %d.\n", dev->name, event);
	switch(event) {
	case DRV_ATTACH:
		MOD_INC_USE_COUNT;
		break;
	case DRV_SUSPEND: {
		int csr6 = readl(ioaddr + NetworkConfig);
		/* Disable interrupts, stop the chip, gather stats. */
		if (csr6 != 0xffffffff) {
			int csr8 = readl(ioaddr + RxMissed);
			writel(0x00000000, ioaddr + IntrEnable);
			writel(csr6 & ~TxOn & ~RxOn, ioaddr + NetworkConfig);
			np->stats.rx_missed_errors += (unsigned short)csr8;
		}
		empty_rings(dev);
		break;
	}
	case DRV_RESUME:
		writel(np->csr0, ioaddr + PCIBusCfg);
		init_ring(dev);
		writel(virt_to_bus(np->rx_ring), ioaddr + RxRingPtr);
		writel(virt_to_bus(np->tx_ring), ioaddr + TxRingPtr);
		writel(0x1A0F5, ioaddr + IntrStatus);
		writel(0x1A0F5, ioaddr + IntrEnable);
		writel(np->csr6 | TxOn | RxOn, ioaddr + NetworkConfig);
		writel(0, ioaddr + RxStartDemand);		/* Rx poll demand */
		set_rx_mode(dev);
		break;
	case DRV_DETACH: {
		struct net_device **devp, **next;
		if (dev->flags & IFF_UP) {
			printk(KERN_ERR "%s: Winbond-840 NIC removed while still "
				   "active.\n", dev->name);
			dev_close(dev);
			dev->flags &= ~(IFF_UP|IFF_RUNNING);
		}
		unregister_netdev(dev);
		release_region(dev->base_addr, pci_id_tbl[np->chip_id].io_size);
#ifndef USE_IO_OPS
		iounmap((char *)dev->base_addr);
#endif
		for (devp = &root_net_dev; *devp; devp = next) {
			next = &((struct netdev_private *)(*devp)->priv)->next_module;
			if (*devp == dev) {
				*devp = *next;
				break;
			}
		}
		if (np->priv_addr)
			kfree(np->priv_addr);
		kfree(dev);
		MOD_DEC_USE_COUNT;
		break;
	}
	default:
		break;
	}

	return 0;
}


#ifdef MODULE
int init_module(void)
{
	if (debug >= NETIF_MSG_DRV)	/* Emit version even if no cards detected. */
		printk(KERN_INFO "%s" KERN_INFO "%s", version1, version2);
	return pci_drv_register(&winbond840_drv_id, NULL);
}

void cleanup_module(void)
{
	struct net_device *next_dev;

	pci_drv_unregister(&winbond840_drv_id);

	/* No need to check MOD_IN_USE, as sys_delete_module() checks. */
	while (root_net_dev) {
		struct netdev_private *np = (void *)(root_net_dev->priv);
		unregister_netdev(root_net_dev);
#ifdef USE_IO_OPS
		release_region(root_net_dev->base_addr,
					   pci_id_tbl[np->chip_id].io_size);
#else
		iounmap((char *)(root_net_dev->base_addr));
#endif
		next_dev = np->next_module;
		if (np->priv_addr)
			kfree(np->priv_addr);
		kfree(root_net_dev);
		root_net_dev = next_dev;
	}
}
#else
int winbond840_probe(struct net_device *dev)
{
	if (pci_drv_register(&winbond840_drv_id, dev) < 0)
		return -ENODEV;
	printk(KERN_INFO "%s" KERN_INFO "%s", version1, version2);
	return 0;
}
#endif  /* MODULE */


/*
 * Local variables:
 *  compile-command: "make KERNVER=`uname -r` winbond-840.o"
 *  compile-cmd: "gcc -DMODULE -Wall -Wstrict-prototypes -O6 -c winbond-840.c"
 *  c-indent-level: 4
 *  c-basic-offset: 4
 *  tab-width: 4
 * End:
 */