3c509.c

linux 内核源代码

	if (dev->base_addr) {
		if (dev->mem_end == 0x3c509 	/* Magic key */
		    && dev->base_addr >= 0x200  &&  dev->base_addr <= 0x3e0)
			ioaddr = dev->base_addr & 0x3f0;
		else if (dev->base_addr != ioaddr)
			goto out;
	}

	if (!request_region(ioaddr, EL3_IO_EXTENT, "3c509")) {
		err = -EBUSY;
		goto out;
	}

	/* Set the adaptor tag so that the next card can be found. */
	outb(0xd0 + ++current_tag, id_port);

	/* Activate the adaptor at the EEPROM location. */
	outb((ioaddr >> 4) | 0xe0, id_port);

	EL3WINDOW(0);
	if (inw(ioaddr) != 0x6d50)
		goto out1;

	/* Free the interrupt so that some other card can use it. */
	outw(0x0f00, ioaddr + WN0_IRQ);

#if defined(__ISAPNP__)
 found:							/* PNP jumps here... */
#endif /* __ISAPNP__ */

	memcpy(dev->dev_addr, phys_addr, sizeof(phys_addr));
	dev->base_addr = ioaddr;
	dev->irq = irq;
	dev->if_port = if_port;
	lp = netdev_priv(dev);
#if defined(__ISAPNP__)
	lp->dev = &idev->dev;
	if (pnp_found)
		lp->type = EL3_PNP;
#endif
	err = el3_common_init(dev);

	if (err)
		goto out1;

	el3_cards++;
	lp->next_dev = el3_root_dev;
	el3_root_dev = dev;
	return 0;

out1:
#if defined(__ISAPNP__)
	if (idev)
		pnp_device_detach(idev);
#endif
out:
	free_netdev(dev);
	return err;
}

#ifdef CONFIG_MCA
static int __init el3_mca_probe(struct device *device)
{
	/* Based on Erik Nygren's ([e-mail]) 3c529 patch,
	 * heavily modified by Chris Beauregard
	 * ([e-mail]) to support standard MCA
	 * probing.
	 *
	 * redone for multi-card detection by ZP Gu ([e-mail])
	 * now works as a module */

	struct el3_private *lp;
	short i;
	int ioaddr, irq, if_port;
	u16 phys_addr[3];
	struct net_device *dev = NULL;
	u_char pos4, pos5;
	struct mca_device *mdev = to_mca_device(device);
	int slot = mdev->slot;
	int err;

	pos4 = mca_device_read_stored_pos(mdev, 4);
	pos5 = mca_device_read_stored_pos(mdev, 5);

	ioaddr = ((short)((pos4&0xfc)|0x02)) << 8;
	irq = pos5 & 0x0f;


	printk("3c529: found %s at slot %d\n",
		   el3_mca_adapter_names[mdev->index], slot + 1);

	/* claim the slot */
	strncpy(mdev->name, el3_mca_adapter_names[mdev->index],
			sizeof(mdev->name));
	mca_device_set_claim(mdev, 1);

	if_port = pos4 & 0x03;

	irq = mca_device_transform_irq(mdev, irq);
	ioaddr = mca_device_transform_ioport(mdev, ioaddr);
	if (el3_debug > 2) {
			printk("3c529: irq %d  ioaddr 0x%x  ifport %d\n", irq, ioaddr, if_port);
	}
	EL3WINDOW(0);
	for (i = 0; i < 3; i++) {
			phys_addr[i] = htons(read_eeprom(ioaddr, i));
	}

	dev = alloc_etherdev(sizeof (struct el3_private));
	if (dev == NULL) {
			release_region(ioaddr, EL3_IO_EXTENT);
			return -ENOMEM;
	}

	netdev_boot_setup_check(dev);

	memcpy(dev->dev_addr, phys_addr, sizeof(phys_addr));
	dev->base_addr = ioaddr;
	dev->irq = irq;
	dev->if_port = if_port;
	lp = netdev_priv(dev);
	lp->dev = device;
	lp->type = EL3_MCA;
	device->driver_data = dev;
	err = el3_common_init(dev);

	if (err) {
		device->driver_data = NULL;
		free_netdev(dev);
		return -ENOMEM;
	}

	el3_cards++;
	return 0;
}

#endif /* CONFIG_MCA */

#ifdef CONFIG_EISA
static int __init el3_eisa_probe (struct device *device)
{
	struct el3_private *lp;
	short i;
	int ioaddr, irq, if_port;
	u16 phys_addr[3];
	struct net_device *dev = NULL;
	struct eisa_device *edev;
	int err;

	/* Yeepee, The driver framework is calling us ! */
	edev = to_eisa_device (device);
	ioaddr = edev->base_addr;

	if (!request_region(ioaddr, EL3_IO_EXTENT, "3c509"))
		return -EBUSY;

	/* Change the register set to the configuration window 0. */
	outw(SelectWindow | 0, ioaddr + 0xC80 + EL3_CMD);

	irq = inw(ioaddr + WN0_IRQ) >> 12;
	if_port = inw(ioaddr + 6)>>14;
	for (i = 0; i < 3; i++)
		phys_addr[i] = htons(read_eeprom(ioaddr, i));

	/* Restore the "Product ID" to the EEPROM read register. */
	read_eeprom(ioaddr, 3);

	dev = alloc_etherdev(sizeof (struct el3_private));
	if (dev == NULL) {
		release_region(ioaddr, EL3_IO_EXTENT);
		return -ENOMEM;
	}

	netdev_boot_setup_check(dev);

	memcpy(dev->dev_addr, phys_addr, sizeof(phys_addr));
	dev->base_addr = ioaddr;
	dev->irq = irq;
	dev->if_port = if_port;
	lp = netdev_priv(dev);
	lp->dev = device;
	lp->type = EL3_EISA;
	eisa_set_drvdata (edev, dev);
	err = el3_common_init(dev);

	if (err) {
		eisa_set_drvdata (edev, NULL);
		free_netdev(dev);
		return err;
	}

	el3_cards++;
	return 0;
}
#endif

#if defined(CONFIG_EISA) || defined(CONFIG_MCA)
/* This remove works for all device types.
 *
 * The net dev must be stored in the driver_data field */
static int __devexit el3_device_remove (struct device *device)
{
	struct net_device *dev;

	dev  = device->driver_data;

	el3_common_remove (dev);
	return 0;
}
#endif

/* Read a word from the EEPROM using the regular EEPROM access register.
   Assume that we are in register window zero.
 */
static ushort read_eeprom(int ioaddr, int index)
{
	outw(EEPROM_READ + index, ioaddr + 10);
	/* Pause for at least 162 us. for the read to take place.
	   Some chips seem to require much longer */
	mdelay(2);
	return inw(ioaddr + 12);
}

/* Read a word from the EEPROM when in the ISA ID probe state. */
static ushort __init id_read_eeprom(int index)
{
	int bit, word = 0;

	/* Issue read command, and pause for at least 162 us. for it to complete.
	   Assume extra-fast 16Mhz bus. */
	outb(EEPROM_READ + index, id_port);

	/* Pause for at least 162 us. for the read to take place. */
	/* Some chips seem to require much longer */
	mdelay(4);

	for (bit = 15; bit >= 0; bit--)
		word = (word << 1) + (inb(id_port) & 0x01);

	if (el3_debug > 3)
		printk("  3c509 EEPROM word %d %#4.4x.\n", index, word);

	return word;
}


static int
el3_open(struct net_device *dev)
{
	int ioaddr = dev->base_addr;
	int i;

	outw(TxReset, ioaddr + EL3_CMD);
	outw(RxReset, ioaddr + EL3_CMD);
	outw(SetStatusEnb | 0x00, ioaddr + EL3_CMD);

	i = request_irq(dev->irq, &el3_interrupt, 0, dev->name, dev);
	if (i)
		return i;

	EL3WINDOW(0);
	if (el3_debug > 3)
		printk("%s: Opening, IRQ %d	 status@%x %4.4x.\n", dev->name,
			   dev->irq, ioaddr + EL3_STATUS, inw(ioaddr + EL3_STATUS));

	el3_up(dev);

	if (el3_debug > 3)
		printk("%s: Opened 3c509  IRQ %d  status %4.4x.\n",
			   dev->name, dev->irq, inw(ioaddr + EL3_STATUS));

	return 0;
}

static void
el3_tx_timeout (struct net_device *dev)
{
	struct el3_private *lp = netdev_priv(dev);
	int ioaddr = dev->base_addr;

	/* Transmitter timeout, serious problems. */
	printk("%s: transmit timed out, Tx_status %2.2x status %4.4x "
		   "Tx FIFO room %d.\n",
		   dev->name, inb(ioaddr + TX_STATUS), inw(ioaddr + EL3_STATUS),
		   inw(ioaddr + TX_FREE));
	lp->stats.tx_errors++;
	dev->trans_start = jiffies;
	/* Issue TX_RESET and TX_START commands. */
	outw(TxReset, ioaddr + EL3_CMD);
	outw(TxEnable, ioaddr + EL3_CMD);
	netif_wake_queue(dev);
}


static int
el3_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct el3_private *lp = netdev_priv(dev);
	int ioaddr = dev->base_addr;
	unsigned long flags;

	netif_stop_queue (dev);

	lp->stats.tx_bytes += skb->len;

	if (el3_debug > 4) {
		printk("%s: el3_start_xmit(length = %u) called, status %4.4x.\n",
			   dev->name, skb->len, inw(ioaddr + EL3_STATUS));
	}
#if 0
#ifndef final_version
	{	/* Error-checking code, delete someday. */
		ushort status = inw(ioaddr + EL3_STATUS);
		if (status & 0x0001 		/* IRQ line active, missed one. */
			&& inw(ioaddr + EL3_STATUS) & 1) { 			/* Make sure. */
			printk("%s: Missed interrupt, status then %04x now %04x"
				   "  Tx %2.2x Rx %4.4x.\n", dev->name, status,
				   inw(ioaddr + EL3_STATUS), inb(ioaddr + TX_STATUS),
				   inw(ioaddr + RX_STATUS));
			/* Fake interrupt trigger by masking, acknowledge interrupts. */
			outw(SetStatusEnb | 0x00, ioaddr + EL3_CMD);
			outw(AckIntr | IntLatch | TxAvailable | RxEarly | IntReq,
				 ioaddr + EL3_CMD);
			outw(SetStatusEnb | 0xff, ioaddr + EL3_CMD);
		}
	}
#endif
#endif
	/*
	 *	We lock the driver against other processors. Note
	 *	we don't need to lock versus the IRQ as we suspended
	 *	that. This means that we lose the ability to take
	 *	an RX during a TX upload. That sucks a bit with SMP
	 *	on an original 3c509 (2K buffer)
	 *
	 *	Using disable_irq stops us crapping on other
	 *	time sensitive devices.
	 */

	spin_lock_irqsave(&lp->lock, flags);

	/* Put out the doubleword header... */
	outw(skb->len, ioaddr + TX_FIFO);
	outw(0x00, ioaddr + TX_FIFO);
	/* ... and the packet rounded to a doubleword. */
	outsl(ioaddr + TX_FIFO, skb->data, (skb->len + 3) >> 2);

	dev->trans_start = jiffies;
	if (inw(ioaddr + TX_FREE) > 1536)
		netif_start_queue(dev);
	else
		/* Interrupt us when the FIFO has room for max-sized packet. */
		outw(SetTxThreshold + 1536, ioaddr + EL3_CMD);

	spin_unlock_irqrestore(&lp->lock, flags);

	dev_kfree_skb (skb);

	/* Clear the Tx status stack. */
	{
		short tx_status;
		int i = 4;

		while (--i > 0	&&	(tx_status = inb(ioaddr + TX_STATUS)) > 0) {
			if (tx_status & 0x38) lp->stats.tx_aborted_errors++;
			if (tx_status & 0x30) outw(TxReset, ioaddr + EL3_CMD);
			if (tx_status & 0x3C) outw(TxEnable, ioaddr + EL3_CMD);
			outb(0x00, ioaddr + TX_STATUS); /* Pop the status stack. */
		}
	}
	return 0;
}

/* The EL3 interrupt handler. */
static irqreturn_t
el3_interrupt(int irq, void *dev_id)
{
	struct net_device *dev = dev_id;
	struct el3_private *lp;
	int ioaddr, status;
	int i = max_interrupt_work;

	lp = netdev_priv(dev);
	spin_lock(&lp->lock);

	ioaddr = dev->base_addr;

	if (el3_debug > 4) {
		status = inw(ioaddr + EL3_STATUS);
		printk("%s: interrupt, status %4.4x.\n", dev->name, status);
	}

	while ((status = inw(ioaddr + EL3_STATUS)) &
		   (IntLatch | RxComplete | StatsFull)) {

		if (status & RxComplete)
			el3_rx(dev);

		if (status & TxAvailable) {
			if (el3_debug > 5)
				printk("	TX room bit was handled.\n");
			/* There's room in the FIFO for a full-sized packet. */
			outw(AckIntr | TxAvailable, ioaddr + EL3_CMD);
			netif_wake_queue (dev);
		}
		if (status & (AdapterFailure | RxEarly | StatsFull | TxComplete)) {
			/* Handle all uncommon interrupts. */
			if (status & StatsFull)				/* Empty statistics. */
				update_stats(dev);
			if (status & RxEarly) {				/* Rx early is unused. */
				el3_rx(dev);
				outw(AckIntr | RxEarly, ioaddr + EL3_CMD);
			}
			if (status & TxComplete) {			/* Really Tx error. */
				struct el3_private *lp = netdev_priv(dev);
				short tx_status;
				int i = 4;

				while (--i>0 && (tx_status = inb(ioaddr + TX_STATUS)) > 0) {
					if (tx_status & 0x38) lp->stats.tx_aborted_errors++;
					if (tx_status & 0x30) outw(TxReset, ioaddr + EL3_CMD);
					if (tx_status & 0x3C) outw(TxEnable, ioaddr + EL3_CMD);
					outb(0x00, ioaddr + TX_STATUS); /* Pop the status stack. */
				}
			}
			if (status & AdapterFailure) {
				/* Adapter failure requires Rx reset and reinit. */
				outw(RxReset, ioaddr + EL3_CMD);
				/* Set the Rx filter to the current state. */
				outw(SetRxFilter | RxStation | RxBroadcast
					 | (dev->flags & IFF_ALLMULTI ? RxMulticast : 0)
					 | (dev->flags & IFF_PROMISC ? RxProm : 0),
					 ioaddr + EL3_CMD);
				outw(RxEnable, ioaddr + EL3_CMD); /* Re-enable the receiver. */
				outw(AckIntr | AdapterFailure, ioaddr + EL3_CMD);
			}
		}

		if (--i < 0) {
			printk("%s: Infinite loop in interrupt, status %4.4x.\n",
				   dev->name, status);
			/* Clear all interrupts. */
			outw(AckIntr | 0xFF, ioaddr + EL3_CMD);
			break;
		}
		/* Acknowledge the IRQ. */
		outw(AckIntr | IntReq | IntLatch, ioaddr + EL3_CMD); /* Ack IRQ */
	}

	if (el3_debug > 4) {
		printk("%s: exiting interrupt, status %4.4x.\n", dev->name,
			   inw(ioaddr + EL3_STATUS));
	}
	spin_unlock(&lp->lock);
	return IRQ_HANDLED;
}


#ifdef CONFIG_NET_POLL_CONTROLLER
/*
 * Polling receive - used by netconsole and other diagnostic tools
 * to allow network i/o with interrupts disabled.
 */
static void el3_poll_controller(struct net_device *dev)
{
	disable_irq(dev->irq);
	el3_interrupt(dev->irq, dev);
	enable_irq(dev->irq);
}
#endif

static struct net_device_stats *
el3_get_stats(struct net_device *dev)
{
	struct el3_private *lp = netdev_priv(dev);
	unsigned long flags;

	/*
	 *	This is fast enough not to bother with disable IRQ
	 *	stuff.
	 */

	spin_lock_irqsave(&lp->lock, flags);
	update_stats(dev);
	spin_unlock_irqrestore(&lp->lock, flags);
	return &lp->stats;
}

/*  Update statistics.  We change to register window 6, so this should be run
	single-threaded if the device is active. This is expected to be a rare
	operation, and it's simpler for the rest of the driver to assume that
	window 1 is always valid rather than use a special window-state variable.
	*/
static void update_stats(struct net_device *dev)
{
	struct el3_private *lp = netdev_priv(dev);
	int ioaddr = dev->base_addr;

	if (el3_debug > 5)
		printk("   Updating the statistics.\n");
	/* Turn off statistics updates while reading. */
	outw(StatsDisable, ioaddr + EL3_CMD);
	/* Switch to the stats window, and read everything. */
	EL3WINDOW(6);
	lp->stats.tx_carrier_errors 	+= inb(ioaddr + 0);
	lp->stats.tx_heartbeat_errors	+= inb(ioaddr + 1);
	/* Multiple collisions. */	   inb(ioaddr + 2);
	lp->stats.collisions		+= inb(ioaddr + 3);
	lp->stats.tx_window_errors	+= inb(ioaddr + 4);
	lp->stats.rx_fifo_errors	+= inb(ioaddr + 5);
	lp->stats.tx_packets		+= inb(ioaddr + 6);
	/* Rx packets	*/		   inb(ioaddr + 7);
	/* Tx deferrals */		   inb(ioaddr + 8);
	inw(ioaddr + 10);	/* Total Rx and Tx octets. */
	inw(ioaddr + 12);

	/* Back to window 1, and turn statistics back on. */
	EL3WINDOW(1);
	outw(StatsEnable, ioaddr + EL3_CMD);
	return;
}

static int
el3_rx(struct net_device *dev)
{
	struct el3_private *lp = netdev_priv(dev);
	int ioaddr = dev->base_addr;