ether1.c

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

	if ((status & (STAT_COMPLETE | STAT_OK)) != (STAT_COMPLETE | STAT_OK)) {
		printk (KERN_WARNING "%s: can't initialise 82586: set address status %04X\n", dev->name, status);
		printk (KERN_DEBUG "%s: SCB=[STS=%04X CMD=%04X CBL=%04X RFA=%04X]\n", dev->name,
			ether1_inw (dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS),
			ether1_inw (dev, SCB_ADDR, scb_t, scb_command, NORMALIRQS),
			ether1_inw (dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS),
			ether1_inw (dev, SCB_ADDR, scb_t, scb_rfa_offset, NORMALIRQS));
		failures += 1;
	}

	i += HZ/10;
	while (((status = ether1_inw (dev, MC_ADDR, mc_t, mc_status, DISABLEIRQS))
			& STAT_COMPLETE) == 0) {
		if (time_after(jiffies, i))
			break;
	}

	if ((status & (STAT_COMPLETE | STAT_OK)) != (STAT_COMPLETE | STAT_OK)) {
		printk (KERN_WARNING "%s: can't initialise 82586: set multicast status %04X\n", dev->name, status);
		printk (KERN_DEBUG "%s: SCB=[STS=%04X CMD=%04X CBL=%04X RFA=%04X]\n", dev->name,
			ether1_inw (dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS),
			ether1_inw (dev, SCB_ADDR, scb_t, scb_command, NORMALIRQS),
			ether1_inw (dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS),
			ether1_inw (dev, SCB_ADDR, scb_t, scb_rfa_offset, NORMALIRQS));
		failures += 1;
	}

	i += HZ;
	while (((status = ether1_inw (dev, TDR_ADDR, tdr_t, tdr_status, DISABLEIRQS))
			& STAT_COMPLETE) == 0) {
		if (time_after(jiffies, i))
			break;
	}

	if ((status & (STAT_COMPLETE | STAT_OK)) != (STAT_COMPLETE | STAT_OK)) {
		printk (KERN_WARNING "%s: can't tdr (ignored)\n", dev->name);
		printk (KERN_DEBUG "%s: SCB=[STS=%04X CMD=%04X CBL=%04X RFA=%04X]\n", dev->name,
			ether1_inw (dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS),
			ether1_inw (dev, SCB_ADDR, scb_t, scb_command, NORMALIRQS),
			ether1_inw (dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS),
			ether1_inw (dev, SCB_ADDR, scb_t, scb_rfa_offset, NORMALIRQS));
	} else {
		status = ether1_inw (dev, TDR_ADDR, tdr_t, tdr_result, DISABLEIRQS);
		if (status & TDR_XCVRPROB)
			printk (KERN_WARNING "%s: i/f failed tdr: transceiver problem\n", dev->name);
		else if ((status & (TDR_SHORT|TDR_OPEN)) && (status & TDR_TIME)) {
#ifdef FANCY
			printk (KERN_WARNING "%s: i/f failed tdr: cable %s %d.%d us away\n", dev->name,
				status & TDR_SHORT ? "short" : "open", (status & TDR_TIME) / 10,
				(status & TDR_TIME) % 10);
#else
			printk (KERN_WARNING "%s: i/f failed tdr: cable %s %d clks away\n", dev->name,
				status & TDR_SHORT ? "short" : "open", (status & TDR_TIME));
#endif
		}
	}

	if (failures)
		ether1_reset (dev);
	return failures ? 1 : 0;
}

/* ------------------------------------------------------------------------- */

static int
ether1_txalloc (struct net_device *dev, int size)
{
	struct ether1_priv *priv = (struct ether1_priv *)dev->priv;
	int start, tail;

	size = (size + 1) & ~1;
	tail = priv->tx_tail;

	if (priv->tx_head + size > TX_AREA_END) {
		if (tail > priv->tx_head)
			return -1;
		start = TX_AREA_START;
		if (start + size > tail)
			return -1;
		priv->tx_head = start + size;
	} else {
		if (priv->tx_head < tail && (priv->tx_head + size) > tail)
			return -1;
		start = priv->tx_head;
		priv->tx_head += size;
	}

	return start;
}

static int
ether1_open (struct net_device *dev)
{
	struct ether1_priv *priv = (struct ether1_priv *)dev->priv;

	if (request_irq(dev->irq, ether1_interrupt, 0, "ether1", dev))
		return -EAGAIN;

	memset (&priv->stats, 0, sizeof (struct net_device_stats));

	if (ether1_init_for_open (dev)) {
		free_irq (dev->irq, dev);
		return -EAGAIN;
	}

	netif_start_queue(dev);

	return 0;
}

static void
ether1_timeout(struct net_device *dev)
{
	struct ether1_priv *priv = (struct ether1_priv *)dev->priv;

	printk(KERN_WARNING "%s: transmit timeout, network cable problem?\n",
		dev->name);
	printk(KERN_WARNING "%s: resetting device\n", dev->name);

	ether1_reset (dev);

	if (ether1_init_for_open (dev))
		printk (KERN_ERR "%s: unable to restart interface\n", dev->name);

	priv->stats.tx_errors++;
	netif_wake_queue(dev);
}

static int
ether1_sendpacket (struct sk_buff *skb, struct net_device *dev)
{
	struct ether1_priv *priv = (struct ether1_priv *)dev->priv;
	int len = (ETH_ZLEN < skb->len) ? skb->len : ETH_ZLEN;
	int tmp, tst, nopaddr, txaddr, tbdaddr, dataddr;
	unsigned long flags;
	tx_t tx;
	tbd_t tbd;
	nop_t nop;

	if (priv->restart) {
		printk(KERN_WARNING "%s: resetting device\n", dev->name);

		ether1_reset(dev);

		if (ether1_init_for_open(dev))
			printk(KERN_ERR "%s: unable to restart interface\n", dev->name);
		else
			priv->restart = 0;
	}

	/*
	 * insert packet followed by a nop
	 */
	txaddr = ether1_txalloc (dev, TX_SIZE);
	tbdaddr = ether1_txalloc (dev, TBD_SIZE);
	dataddr = ether1_txalloc (dev, len);
	nopaddr = ether1_txalloc (dev, NOP_SIZE);

	tx.tx_status = 0;
	tx.tx_command = CMD_TX | CMD_INTR;
	tx.tx_link = nopaddr;
	tx.tx_tbdoffset = tbdaddr;
	tbd.tbd_opts = TBD_EOL | len;
	tbd.tbd_link = I82586_NULL;
	tbd.tbd_bufl = dataddr;
	tbd.tbd_bufh = 0;
	nop.nop_status = 0;
	nop.nop_command = CMD_NOP;
	nop.nop_link = nopaddr;

	save_flags_cli(flags);
	ether1_writebuffer (dev, &tx, txaddr, TX_SIZE);
	ether1_writebuffer (dev, &tbd, tbdaddr, TBD_SIZE);
	ether1_writebuffer (dev, skb->data, dataddr, len);
	ether1_writebuffer (dev, &nop, nopaddr, NOP_SIZE);
	tmp = priv->tx_link;
	priv->tx_link = nopaddr;

	/* now reset the previous nop pointer */
	ether1_outw (dev, txaddr, tmp, nop_t, nop_link, NORMALIRQS);

	restore_flags(flags);

	/* handle transmit */
	dev->trans_start = jiffies;

	/* check to see if we have room for a full sized ether frame */
	tmp = priv->tx_head;
	tst = ether1_txalloc (dev, TX_SIZE + TBD_SIZE + NOP_SIZE + ETH_FRAME_LEN);
	priv->tx_head = tmp;
	dev_kfree_skb (skb);

	if (tst == -1)
		netif_stop_queue(dev);

	return 0;
}

static void
ether1_xmit_done (struct net_device *dev)
{
	struct ether1_priv *priv = (struct ether1_priv *)dev->priv;
	nop_t nop;
	int caddr, tst;

	caddr = priv->tx_tail;

again:
	ether1_readbuffer (dev, &nop, caddr, NOP_SIZE);

	switch (nop.nop_command & CMD_MASK) {
	case CMD_TDR:
		/* special case */
		if (ether1_inw (dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS)
				!= (unsigned short)I82586_NULL) {
			ether1_outw(dev, SCB_CMDCUCSTART | SCB_CMDRXSTART, SCB_ADDR, scb_t,
				    scb_command, NORMALIRQS);
			outb (CTRL_CA, REG_CONTROL);
		}
		priv->tx_tail = NOP_ADDR;
		return;

	case CMD_NOP:
		if (nop.nop_link == caddr) {
			if (priv->initialising == 0)
				printk (KERN_WARNING "%s: strange command complete with no tx command!\n", dev->name);
			else
			        priv->initialising = 0;
			return;
		}
		if (caddr == nop.nop_link)
			return;
		caddr = nop.nop_link;
		goto again;

	case CMD_TX:
		if (nop.nop_status & STAT_COMPLETE)
			break;
		printk (KERN_ERR "%s: strange command complete without completed command\n", dev->name);
		priv->restart = 1;
		return;

	default:
		printk (KERN_WARNING "%s: strange command %d complete! (offset %04X)", dev->name,
			nop.nop_command & CMD_MASK, caddr);
		priv->restart = 1;
		return;
	}

	while (nop.nop_status & STAT_COMPLETE) {
		if (nop.nop_status & STAT_OK) {
			priv->stats.tx_packets ++;
			priv->stats.collisions += (nop.nop_status & STAT_COLLISIONS);
		} else {
			priv->stats.tx_errors ++;

			if (nop.nop_status & STAT_COLLAFTERTX)
				priv->stats.collisions ++;
			if (nop.nop_status & STAT_NOCARRIER)
				priv->stats.tx_carrier_errors ++;
			if (nop.nop_status & STAT_TXLOSTCTS)
				printk (KERN_WARNING "%s: cts lost\n", dev->name);
			if (nop.nop_status & STAT_TXSLOWDMA)
				priv->stats.tx_fifo_errors ++;
			if (nop.nop_status & STAT_COLLEXCESSIVE)
				priv->stats.collisions += 16;
		}

		if (nop.nop_link == caddr) {
			printk (KERN_ERR "%s: tx buffer chaining error: tx command points to itself\n", dev->name);
			break;
		}

		caddr = nop.nop_link;
		ether1_readbuffer (dev, &nop, caddr, NOP_SIZE);
		if ((nop.nop_command & CMD_MASK) != CMD_NOP) {
			printk (KERN_ERR "%s: tx buffer chaining error: no nop after tx command\n", dev->name);
			break;
		}

		if (caddr == nop.nop_link)
			break;

		caddr = nop.nop_link;
		ether1_readbuffer (dev, &nop, caddr, NOP_SIZE);
		if ((nop.nop_command & CMD_MASK) != CMD_TX) {
			printk (KERN_ERR "%s: tx buffer chaining error: no tx command after nop\n", dev->name);
			break;
		}
	}
	priv->tx_tail = caddr;

	caddr = priv->tx_head;
	tst = ether1_txalloc (dev, TX_SIZE + TBD_SIZE + NOP_SIZE + ETH_FRAME_LEN);
	priv->tx_head = caddr;
	if (tst != -1)
		netif_wake_queue(dev);
}

static void
ether1_recv_done (struct net_device *dev)
{
	struct ether1_priv *priv = (struct ether1_priv *)dev->priv;
	int status;
	int nexttail, rbdaddr;
	rbd_t rbd;

	do {
		status = ether1_inw (dev, priv->rx_head, rfd_t, rfd_status, NORMALIRQS);
		if ((status & RFD_COMPLETE) == 0)
			break;

		rbdaddr = ether1_inw (dev, priv->rx_head, rfd_t, rfd_rbdoffset, NORMALIRQS);
		ether1_readbuffer (dev, &rbd, rbdaddr, RBD_SIZE);

		if ((rbd.rbd_status & (RBD_EOF | RBD_ACNTVALID)) == (RBD_EOF | RBD_ACNTVALID)) {
			int length = rbd.rbd_status & RBD_ACNT;
			struct sk_buff *skb;

			length = (length + 1) & ~1;
			skb = dev_alloc_skb (length + 2);

			if (skb) {
				skb->dev = dev;
				skb_reserve (skb, 2);

				ether1_readbuffer (dev, skb_put (skb, length), rbd.rbd_bufl, length);

				skb->protocol = eth_type_trans (skb, dev);
				netif_rx (skb);
				priv->stats.rx_packets ++;
			} else
				priv->stats.rx_dropped ++;
		} else {
			printk(KERN_WARNING "%s: %s\n", dev->name,
				(rbd.rbd_status & RBD_EOF) ? "oversized packet" : "acnt not valid");
			priv->stats.rx_dropped ++;
		}

		nexttail = ether1_inw (dev, priv->rx_tail, rfd_t, rfd_link, NORMALIRQS);
		/* nexttail should be rx_head */
		if (nexttail != priv->rx_head)
			printk(KERN_ERR "%s: receiver buffer chaining error (%04X != %04X)\n",
				dev->name, nexttail, priv->rx_head);
		ether1_outw (dev, RFD_CMDEL | RFD_CMDSUSPEND, nexttail, rfd_t, rfd_command, NORMALIRQS);
		ether1_outw (dev, 0, priv->rx_tail, rfd_t, rfd_command, NORMALIRQS);
		ether1_outw (dev, 0, priv->rx_tail, rfd_t, rfd_status, NORMALIRQS);
		ether1_outw (dev, 0, priv->rx_tail, rfd_t, rfd_rbdoffset, NORMALIRQS);
	
		priv->rx_tail = nexttail;
		priv->rx_head = ether1_inw (dev, priv->rx_head, rfd_t, rfd_link, NORMALIRQS);
	} while (1);
}

static void
ether1_interrupt (int irq, void *dev_id, struct pt_regs *regs)
{
	struct net_device *dev = (struct net_device *)dev_id;
	struct ether1_priv *priv = (struct ether1_priv *)dev->priv;
	int status;

	status = ether1_inw (dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS);

	if (status) {
		ether1_outw(dev, status & (SCB_STRNR | SCB_STCNA | SCB_STFR | SCB_STCX),
			    SCB_ADDR, scb_t, scb_command, NORMALIRQS);
		outb (CTRL_CA | CTRL_ACK, REG_CONTROL);
		if (status & SCB_STCX) {
			ether1_xmit_done (dev);
		}
		if (status & SCB_STCNA) {
			if (priv->resetting == 0)
				printk (KERN_WARNING "%s: CU went not ready ???\n", dev->name);
			else
				priv->resetting += 1;
			if (ether1_inw (dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS)
					!= (unsigned short)I82586_NULL) {
				ether1_outw (dev, SCB_CMDCUCSTART, SCB_ADDR, scb_t, scb_command, NORMALIRQS);
				outb (CTRL_CA, REG_CONTROL);
			}
			if (priv->resetting == 2)
				priv->resetting = 0;
		}
		if (status & SCB_STFR) {
			ether1_recv_done (dev);
		}
		if (status & SCB_STRNR) {
			if (ether1_inw (dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS) & SCB_STRXSUSP) {
				printk (KERN_WARNING "%s: RU went not ready: RU suspended\n", dev->name);
				ether1_outw (dev, SCB_CMDRXRESUME, SCB_ADDR, scb_t, scb_command, NORMALIRQS);
				outb (CTRL_CA, REG_CONTROL);
				priv->stats.rx_dropped ++;	/* we suspended due to lack of buffer space */
			} else
				printk(KERN_WARNING "%s: RU went not ready: %04X\n", dev->name,
					ether1_inw (dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS));
			printk (KERN_WARNING "RU ptr = %04X\n", ether1_inw (dev, SCB_ADDR, scb_t, scb_rfa_offset,
						NORMALIRQS));
		}
	} else
	        outb (CTRL_ACK, REG_CONTROL);
}

static int
ether1_close (struct net_device *dev)
{
	ether1_reset (dev);

	free_irq(dev->irq, dev);

	return 0;
}

static struct net_device_stats *
ether1_getstats (struct net_device *dev)
{
	struct ether1_priv *priv = (struct ether1_priv *)dev->priv;
	return &priv->stats;
}

/*
 * Set or clear the multicast filter for this adaptor.
 * num_addrs == -1	Promiscuous mode, receive all packets.
 * num_addrs == 0	Normal mode, clear multicast list.
 * num_addrs > 0	Multicast mode, receive normal and MC packets, and do
 *			best-effort filtering.
 */
static void
ether1_setmulticastlist (struct net_device *dev)
{
}

/* ------------------------------------------------------------------------- */

static void __init ether1_banner(void)
{
	static unsigned int version_printed = 0;

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

static struct net_device * __init ether1_init_one(struct expansion_card *ec)
{
	struct net_device *dev;
	struct ether1_priv *priv;
	int i;

	ether1_banner();

	ecard_claim(ec);

	dev = init_etherdev(NULL, sizeof(struct ether1_priv));
	if (!dev)
		goto out;

	SET_MODULE_OWNER(dev);

	dev->base_addr	= ecard_address(ec, ECARD_IOC, ECARD_FAST);
	dev->irq	= ec->irq;

	/*
	 * these will not fail - the nature of the bus ensures this
	 */
	request_region(dev->base_addr, 16, dev->name);
	request_region(dev->base_addr + 0x800, 4096, dev->name);

	priv = (struct ether1_priv *)dev->priv;
	if ((priv->bus_type = ether1_reset(dev)) == 0)
		goto release;

	printk(KERN_INFO "%s: ether1 in slot %d, ",
		dev->name, ec->slot_no);
    
	for (i = 0; i < 6; i++) {
		dev->dev_addr[i] = inb(IDPROM_ADDRESS + i);
		printk ("%2.2x%c", dev->dev_addr[i], i == 5 ? '\n' : ':');
	}

	if (ether1_init_2(dev))
		goto release;

	dev->open		= ether1_open;
	dev->stop		= ether1_close;
	dev->hard_start_xmit    = ether1_sendpacket;
	dev->get_stats		= ether1_getstats;
	dev->set_multicast_list = ether1_setmulticastlist;
	dev->tx_timeout		= ether1_timeout;
	dev->watchdog_timeo	= 5 * HZ / 100;
	return 0;

release:
	release_region(dev->base_addr, 16);
	release_region(dev->base_addr + 0x800, 4096);
	unregister_netdev(dev);
	kfree(dev);
out:
	ecard_release(ec);
	return dev;
}

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

static int __init ether1_init(void)
{
	int i, ret = -ENODEV;

	ecard_startfind();

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

		ec = ecard_find(0, ether1_cids);
		if (!ec)
			break;

		dev = ether1_init_one(ec);
		if (!dev)
			break;

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

	return ret;
}

static void __exit ether1_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, 16);
			release_region(e_dev[i]->base_addr + 0x800, 4096);
			kfree(e_dev[i]);
			e_dev[i] = NULL;
		}
		if (e_card[i]) {
			ecard_release(e_card[i]);
			e_card[i] = NULL;
		}
	}
}

module_init(ether1_init);
module_exit(ether1_exit);

MODULE_LICENSE("GPL");