ether3.c

内核linux2.4.20,可跟rtlinux3.2打补丁 组成实时linux系统,编译内核

	priv->regs.config1 &= ~CFG1_RECVPROMISC;

	if (dev->flags & IFF_PROMISC) {
		/* promiscuous mode */
		priv->regs.config1 |= CFG1_RECVPROMISC;
	} else if (dev->flags & IFF_ALLMULTI) {
		priv->regs.config1 |= CFG1_RECVSPECBRMULTI;
	} else
		priv->regs.config1 |= CFG1_RECVSPECBROAD;

	ether3_outw(priv->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
}

static void
ether3_timeout(struct net_device *dev)
{
	struct dev_priv *priv = (struct dev_priv *)dev->priv;
	unsigned long flags;

	del_timer(&priv->timer);

	save_flags_cli(flags);
	printk(KERN_ERR "%s: transmit timed out, network cable problem?\n", dev->name);
	printk(KERN_ERR "%s: state: { status=%04X cfg1=%04X cfg2=%04X }\n", dev->name,
		ether3_inw(REG_STATUS), ether3_inw(REG_CONFIG1), ether3_inw(REG_CONFIG2));
	printk(KERN_ERR "%s: { rpr=%04X rea=%04X tpr=%04X }\n", dev->name,
		ether3_inw(REG_RECVPTR), ether3_inw(REG_RECVEND), ether3_inw(REG_TRANSMITPTR));
	printk(KERN_ERR "%s: tx head=%X tx tail=%X\n", dev->name,
		priv->tx_head, priv->tx_tail);
	ether3_setbuffer(dev, buffer_read, priv->tx_tail);
	printk(KERN_ERR "%s: packet status = %08X\n", dev->name, ether3_readlong(dev));
	restore_flags(flags);

	priv->regs.config2 |= CFG2_CTRLO;
	priv->stats.tx_errors += 1;
	ether3_outw(priv->regs.config2, REG_CONFIG2);
	priv->tx_head = priv->tx_tail = 0;

	netif_wake_queue(dev);
}

/*
 * Transmit a packet
 */
static int
ether3_sendpacket(struct sk_buff *skb, struct net_device *dev)
{
	struct dev_priv *priv = (struct dev_priv *)dev->priv;
	unsigned long flags;
	unsigned int length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
	unsigned int ptr, next_ptr;

	length = (length + 1) & ~1;

	if (priv->broken) {
		dev_kfree_skb(skb);
		priv->stats.tx_dropped ++;
		netif_start_queue(dev);
		return 0;
	}

	next_ptr = (priv->tx_head + 1) & 15;

	save_flags_cli(flags);

	if (priv->tx_tail == next_ptr) {
		restore_flags(flags);
		return 1;	/* unable to queue */
	}

	dev->trans_start = jiffies;
	ptr		 = 0x600 * priv->tx_head;
	priv->tx_head	 = next_ptr;
	next_ptr	*= 0x600;

#define TXHDR_FLAGS (TXHDR_TRANSMIT|TXHDR_CHAINCONTINUE|TXHDR_DATAFOLLOWS|TXHDR_ENSUCCESS)

	ether3_setbuffer(dev, buffer_write, next_ptr);
	ether3_writelong(dev, 0);
	ether3_setbuffer(dev, buffer_write, ptr);
	ether3_writelong(dev, 0);
	ether3_writebuffer(dev, skb->data, length);
	ether3_writeword(dev, htons(next_ptr));
	ether3_writeword(dev, TXHDR_CHAINCONTINUE >> 16);
	ether3_setbuffer(dev, buffer_write, ptr);
	ether3_writeword(dev, htons((ptr + length + 4)));
	ether3_writeword(dev, TXHDR_FLAGS >> 16);
	ether3_ledon(dev, priv);

	if (!(ether3_inw(REG_STATUS) & STAT_TXON)) {
		ether3_outw(ptr, REG_TRANSMITPTR);
		ether3_outw(priv->regs.command | CMD_TXON, REG_COMMAND);
	}

	next_ptr = (priv->tx_head + 1) & 15;
	restore_flags(flags);

	dev_kfree_skb(skb);

	if (priv->tx_tail == next_ptr)
		netif_stop_queue(dev);

	return 0;
}

static void
ether3_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
	struct net_device *dev = (struct net_device *)dev_id;
	struct dev_priv *priv;
	unsigned int status;

#if NET_DEBUG > 1
	if(net_debug & DEBUG_INT)
		printk("eth3irq: %d ", irq);
#endif

	priv = (struct dev_priv *)dev->priv;

	status = ether3_inw(REG_STATUS);

	if (status & STAT_INTRX) {
		ether3_outw(CMD_ACKINTRX | priv->regs.command, REG_COMMAND);
		ether3_rx(dev, priv, 12);
	}

	if (status & STAT_INTTX) {
		ether3_outw(CMD_ACKINTTX | priv->regs.command, REG_COMMAND);
		ether3_tx(dev, priv);
	}

#if NET_DEBUG > 1
	if(net_debug & DEBUG_INT)
		printk("done\n");
#endif
}

/*
 * If we have a good packet(s), get it/them out of the buffers.
 */
static int
ether3_rx(struct net_device *dev, struct dev_priv *priv, unsigned int maxcnt)
{
	unsigned int next_ptr = priv->rx_head, received = 0;
	ether3_ledon(dev, priv);

	do {
		unsigned int this_ptr, status;
		unsigned char addrs[16];

		/*
		 * read the first 16 bytes from the buffer.
		 * This contains the status bytes etc and ethernet addresses,
		 * and we also check the source ethernet address to see if
		 * it originated from us.
		 */
		{
			unsigned int temp_ptr;
			ether3_setbuffer(dev, buffer_read, next_ptr);
			temp_ptr = ether3_readword(dev);
			status = ether3_readword(dev);
			if ((status & (RXSTAT_DONE | RXHDR_CHAINCONTINUE | RXHDR_RECEIVE)) !=
				(RXSTAT_DONE | RXHDR_CHAINCONTINUE) || !temp_ptr)
				break;

			this_ptr = next_ptr + 4;
			next_ptr = ntohs(temp_ptr);
		}
		ether3_setbuffer(dev, buffer_read, this_ptr);
		ether3_readbuffer(dev, addrs+2, 12);

if (next_ptr < RX_START || next_ptr >= RX_END) {
 int i;
 printk("%s: bad next pointer @%04X: ", dev->name, priv->rx_head);
 printk("%02X %02X %02X %02X ", next_ptr >> 8, next_ptr & 255, status & 255, status >> 8);
 for (i = 2; i < 14; i++)
   printk("%02X ", addrs[i]);
 printk("\n");
 next_ptr = priv->rx_head;
 break;
}
		/*
 		 * ignore our own packets...
	 	 */
		if (!(*(unsigned long *)&dev->dev_addr[0] ^ *(unsigned long *)&addrs[2+6]) &&
		    !(*(unsigned short *)&dev->dev_addr[4] ^ *(unsigned short *)&addrs[2+10])) {
			maxcnt ++; /* compensate for loopedback packet */
			ether3_outw(next_ptr >> 8, REG_RECVEND);
		} else
		if (!(status & (RXSTAT_OVERSIZE|RXSTAT_CRCERROR|RXSTAT_DRIBBLEERROR|RXSTAT_SHORTPACKET))) {
			unsigned int length = next_ptr - this_ptr;
			struct sk_buff *skb;

			if (next_ptr <= this_ptr)
				length += RX_END - RX_START;

			skb = dev_alloc_skb(length + 2);
			if (skb) {
				unsigned char *buf;

				skb->dev = dev;
				skb_reserve(skb, 2);
				buf = skb_put(skb, length);
				ether3_readbuffer(dev, buf + 12, length - 12);
				ether3_outw(next_ptr >> 8, REG_RECVEND);
				*(unsigned short *)(buf + 0)	= *(unsigned short *)(addrs + 2);
				*(unsigned long *)(buf + 2)	= *(unsigned long *)(addrs + 4);
				*(unsigned long *)(buf + 6)	= *(unsigned long *)(addrs + 8);
				*(unsigned short *)(buf + 10)	= *(unsigned short *)(addrs + 12);
				skb->protocol = eth_type_trans(skb, dev);
				netif_rx(skb);
				received ++;
			} else
				goto dropping;
		} else {
			struct net_device_stats *stats = &priv->stats;
			ether3_outw(next_ptr >> 8, REG_RECVEND);
			if (status & RXSTAT_OVERSIZE)	  stats->rx_over_errors ++;
			if (status & RXSTAT_CRCERROR)	  stats->rx_crc_errors ++;
			if (status & RXSTAT_DRIBBLEERROR) stats->rx_fifo_errors ++;
			if (status & RXSTAT_SHORTPACKET)  stats->rx_length_errors ++;
			stats->rx_errors++;
		}
	}
	while (-- maxcnt);

done:
	priv->stats.rx_packets += received;
	priv->rx_head = next_ptr;
	/*
	 * If rx went off line, then that means that the buffer may be full.  We
	 * have dropped at least one packet.
	 */
	if (!(ether3_inw(REG_STATUS) & STAT_RXON)) {
		priv->stats.rx_dropped ++;
    		ether3_outw(next_ptr, REG_RECVPTR);
		ether3_outw(priv->regs.command | CMD_RXON, REG_COMMAND);
	}

	return maxcnt;

dropping:{
	static unsigned long last_warned;

	ether3_outw(next_ptr >> 8, REG_RECVEND);
	/*
	 * Don't print this message too many times...
	 */
	if (jiffies - last_warned > 30 * HZ) {
		last_warned = jiffies;
		printk("%s: memory squeeze, dropping packet.\n", dev->name);
	}
	priv->stats.rx_dropped ++;
	goto done;
	}
}

/*
 * Update stats for the transmitted packet(s)
 */
static void
ether3_tx(struct net_device *dev, struct dev_priv *priv)
{
	unsigned int tx_tail = priv->tx_tail;
	int max_work = 14;

	do {
	    	unsigned long status;

    		/*
	    	 * Read the packet header
    		 */
	    	ether3_setbuffer(dev, buffer_read, tx_tail * 0x600);
    		status = ether3_readlong(dev);

		/*
		 * Check to see if this packet has been transmitted
		 */
		if ((status & (TXSTAT_DONE | TXHDR_TRANSMIT)) !=
		    (TXSTAT_DONE | TXHDR_TRANSMIT))
			break;

		/*
		 * Update errors
		 */
		if (!(status & (TXSTAT_BABBLED | TXSTAT_16COLLISIONS)))
			priv->stats.tx_packets++;
		else {
			priv->stats.tx_errors ++;
			if (status & TXSTAT_16COLLISIONS) priv->stats.collisions += 16;
			if (status & TXSTAT_BABBLED) priv->stats.tx_fifo_errors ++;
		}

		tx_tail = (tx_tail + 1) & 15;
	} while (--max_work);

	if (priv->tx_tail != tx_tail) {
		priv->tx_tail = tx_tail;
		netif_wake_queue(dev);
	}
}

static void __init ether3_banner(void)
{
	static unsigned version_printed = 0;

	if (net_debug && version_printed++ == 0)
		printk(KERN_INFO "%s", version);
}

static const char * __init
ether3_get_dev(struct net_device *dev, struct expansion_card *ec)
{
	const char *name = "ether3";
	dev->base_addr = ecard_address(ec, ECARD_MEMC, 0);
	dev->irq = ec->irq;

	if (ec->cid.manufacturer == MANU_ANT &&
	    ec->cid.product == PROD_ANT_ETHERB) {
		dev->base_addr += 0x200;
		name = "etherb";
	}

	ec->irqaddr = (volatile unsigned char *)ioaddr(dev->base_addr);
	ec->irqmask = 0xf0;

	if (ether3_addr(dev->dev_addr, ec))
		name = NULL;

	return name;
}

static struct net_device * __init ether3_init_one(struct expansion_card *ec)
{
	struct net_device *dev;
	struct dev_priv *priv;
	const char *name;
	int i, bus_type;

	ether3_banner();

	ecard_claim(ec);

	dev = init_etherdev(NULL, sizeof(struct dev_priv));
	if (!dev)
		goto out;

	SET_MODULE_OWNER(dev);

	name = ether3_get_dev(dev, ec);
	if (!name)
		goto free;

	/*
	 * this will not fail - the nature of the bus ensures this
	 */
	if (!request_region(dev->base_addr, 128, dev->name))
		goto free;

	priv = (struct dev_priv *) dev->priv;

	/* Reset card...
	 */
	ether3_outb(0x80, REG_CONFIG2 + 1);
	bus_type = BUS_UNKNOWN;
	udelay(4);

	/* Test using Receive Pointer (16-bit register) to find out
	 * how the ether3 is connected to the bus...
	 */
	if (ether3_probe_bus_8(dev, 0x100) &&
	    ether3_probe_bus_8(dev, 0x201))
		bus_type = BUS_8;

	if (bus_type == BUS_UNKNOWN &&
	    ether3_probe_bus_16(dev, 0x101) &&
	    ether3_probe_bus_16(dev, 0x201))
		bus_type = BUS_16;

	switch (bus_type) {
	case BUS_UNKNOWN:
		printk(KERN_ERR "%s: unable to identify bus width\n", dev->name);
		goto failed;

	case BUS_8:
		printk(KERN_ERR "%s: %s found, but is an unsupported "
			"8-bit card\n", dev->name, name);
		goto failed;

	default:
		break;
	}

	printk("%s: %s in slot %d, ", dev->name, name, ec->slot_no);
	for (i = 0; i < 6; i++)
		printk("%2.2x%c", dev->dev_addr[i], i == 5 ? '\n' : ':');

	if (ether3_init_2(dev))
		goto failed;

	dev->open		= ether3_open;
	dev->stop		= ether3_close;
	dev->hard_start_xmit	= ether3_sendpacket;
	dev->get_stats		= ether3_getstats;
	dev->set_multicast_list	= ether3_setmulticastlist;
	dev->tx_timeout		= ether3_timeout;
	dev->watchdog_timeo	= 5 * HZ / 100;
	return 0;

failed:
	release_region(dev->base_addr, 128);
free:
	unregister_netdev(dev);
	kfree(dev);
out:
	ecard_release(ec);
	return NULL;
}

static struct expansion_card	*e_card[MAX_ECARDS];
static struct net_device	*e_dev[MAX_ECARDS];

static int ether3_init(void)
{
	int i, ret = -ENODEV;

	ecard_startfind();

	for (i = 0; i < MAX_ECARDS; i++) {
		struct net_device *dev;
		struct expansion_card *ec;

		ec = ecard_find(0, ether3_cids);
		if (!ec)
			break;

		dev = ether3_init_one(ec);
		if (!dev)
			break;

		e_card[i] = ec;
		e_dev[i]  = dev;
		ret = 0;
	}

	return ret;
}

static void ether3_exit(void)
{
	int i;

	for (i = 0; i < MAX_ECARDS; i++) {
		if (e_dev[i]) {
			unregister_netdev(e_dev[i]);
			release_region(e_dev[i]->base_addr, 128);
			kfree(e_dev[i]);
			e_dev[i] = NULL;
		}
		if (e_card[i]) {
			ecard_release(e_card[i]);
			e_card[i] = NULL;
		}
	}
}

module_init(ether3_init);
module_exit(ether3_exit);

MODULE_LICENSE("GPL");