a2065.c

来自「linux 内核源代码」· C语言 代码 · 共 828 行 · 第 1/2 页

			dev->stats.tx_packets++;
		}

		j = (j + 1) & lp->tx_ring_mod_mask;
	}
	lp->tx_old = j;
	ll->rdp = LE_C0_TINT | LE_C0_INEA;
	return 0;
}

static irqreturn_t lance_interrupt (int irq, void *dev_id)
{
	struct net_device *dev;
	struct lance_private *lp;
	volatile struct lance_regs *ll;
	int csr0;

	dev = (struct net_device *) dev_id;

	lp = netdev_priv(dev);
	ll = lp->ll;

	ll->rap = LE_CSR0;		/* LANCE Controller Status */
	csr0 = ll->rdp;

	if (!(csr0 & LE_C0_INTR))	/* Check if any interrupt has */
		return IRQ_NONE;	/* been generated by the Lance. */

	/* Acknowledge all the interrupt sources ASAP */
	ll->rdp = csr0 & ~(LE_C0_INEA|LE_C0_TDMD|LE_C0_STOP|LE_C0_STRT|
			   LE_C0_INIT);

	if ((csr0 & LE_C0_ERR)) {
		/* Clear the error condition */
		ll->rdp = LE_C0_BABL|LE_C0_ERR|LE_C0_MISS|LE_C0_INEA;
	}

	if (csr0 & LE_C0_RINT)
		lance_rx (dev);

	if (csr0 & LE_C0_TINT)
		lance_tx (dev);

	/* Log misc errors. */
	if (csr0 & LE_C0_BABL)
		dev->stats.tx_errors++;       /* Tx babble. */
	if (csr0 & LE_C0_MISS)
		dev->stats.rx_errors++;       /* Missed a Rx frame. */
	if (csr0 & LE_C0_MERR) {
		printk(KERN_ERR "%s: Bus master arbitration failure, status "
		       "%4.4x.\n", dev->name, csr0);
		/* Restart the chip. */
		ll->rdp = LE_C0_STRT;
	}

	if (netif_queue_stopped(dev) && TX_BUFFS_AVAIL > 0)
		netif_wake_queue(dev);

	ll->rap = LE_CSR0;
	ll->rdp = LE_C0_BABL|LE_C0_CERR|LE_C0_MISS|LE_C0_MERR|
					LE_C0_IDON|LE_C0_INEA;
	return IRQ_HANDLED;
}

struct net_device *last_dev = 0;

static int lance_open (struct net_device *dev)
{
	struct lance_private *lp = netdev_priv(dev);
	volatile struct lance_regs *ll = lp->ll;
	int ret;

	last_dev = dev;

	/* Stop the Lance */
	ll->rap = LE_CSR0;
	ll->rdp = LE_C0_STOP;

	/* Install the Interrupt handler */
	ret = request_irq(IRQ_AMIGA_PORTS, lance_interrupt, IRQF_SHARED,
			  dev->name, dev);
	if (ret) return ret;

	load_csrs (lp);
	lance_init_ring (dev);

	netif_start_queue(dev);

	return init_restart_lance (lp);
}

static int lance_close (struct net_device *dev)
{
	struct lance_private *lp = netdev_priv(dev);
	volatile struct lance_regs *ll = lp->ll;

	netif_stop_queue(dev);
	del_timer_sync(&lp->multicast_timer);

	/* Stop the card */
	ll->rap = LE_CSR0;
	ll->rdp = LE_C0_STOP;

	free_irq(IRQ_AMIGA_PORTS, dev);
	return 0;
}

static inline int lance_reset (struct net_device *dev)
{
	struct lance_private *lp = netdev_priv(dev);
	volatile struct lance_regs *ll = lp->ll;
	int status;

	/* Stop the lance */
	ll->rap = LE_CSR0;
	ll->rdp = LE_C0_STOP;

	load_csrs (lp);

	lance_init_ring (dev);
	dev->trans_start = jiffies;
	netif_start_queue(dev);

	status = init_restart_lance (lp);
#ifdef DEBUG_DRIVER
	printk(KERN_DEBUG "Lance restart=%d\n", status);
#endif
	return status;
}

static void lance_tx_timeout(struct net_device *dev)
{
	struct lance_private *lp = netdev_priv(dev);
	volatile struct lance_regs *ll = lp->ll;

	printk(KERN_ERR "%s: transmit timed out, status %04x, reset\n",
	       dev->name, ll->rdp);
	lance_reset(dev);
	netif_wake_queue(dev);
}

static int lance_start_xmit (struct sk_buff *skb, struct net_device *dev)
{
	struct lance_private *lp = netdev_priv(dev);
	volatile struct lance_regs *ll = lp->ll;
	volatile struct lance_init_block *ib = lp->init_block;
	int entry, skblen, len;
	int status = 0;
	unsigned long flags;

	skblen = skb->len;
	len = skblen;

	if (len < ETH_ZLEN) {
		len = ETH_ZLEN;
		if (skb_padto(skb, ETH_ZLEN))
			return 0;
	}

	local_irq_save(flags);

	if (!TX_BUFFS_AVAIL){
		local_irq_restore(flags);
		return -1;
	}

#ifdef DEBUG_DRIVER
	/* dump the packet */
	{
		int i;

		for (i = 0; i < 64; i++) {
			if ((i % 16) == 0)
				printk("\n" KERN_DEBUG);
			printk ("%2.2x ", skb->data [i]);
		}
		printk("\n");
	}
#endif
	entry = lp->tx_new & lp->tx_ring_mod_mask;
	ib->btx_ring [entry].length = (-len) | 0xf000;
	ib->btx_ring [entry].misc = 0;

	skb_copy_from_linear_data(skb, (void *)&ib->tx_buf [entry][0], skblen);

	/* Clear the slack of the packet, do I need this? */
	if (len != skblen)
		memset ((void *) &ib->tx_buf [entry][skblen], 0, len - skblen);

	/* Now, give the packet to the lance */
	ib->btx_ring [entry].tmd1_bits = (LE_T1_POK|LE_T1_OWN);
	lp->tx_new = (lp->tx_new+1) & lp->tx_ring_mod_mask;
	dev->stats.tx_bytes += skblen;

	if (TX_BUFFS_AVAIL <= 0)
		netif_stop_queue(dev);

	/* Kick the lance: transmit now */
	ll->rdp = LE_C0_INEA | LE_C0_TDMD;
	dev->trans_start = jiffies;
	dev_kfree_skb (skb);

	local_irq_restore(flags);

	return status;
}

/* taken from the depca driver */
static void lance_load_multicast (struct net_device *dev)
{
	struct lance_private *lp = netdev_priv(dev);
	volatile struct lance_init_block *ib = lp->init_block;
	volatile u16 *mcast_table = (u16 *)&ib->filter;
	struct dev_mc_list *dmi=dev->mc_list;
	char *addrs;
	int i;
	u32 crc;

	/* set all multicast bits */
	if (dev->flags & IFF_ALLMULTI){
		ib->filter [0] = 0xffffffff;
		ib->filter [1] = 0xffffffff;
		return;
	}
	/* clear the multicast filter */
	ib->filter [0] = 0;
	ib->filter [1] = 0;

	/* Add addresses */
	for (i = 0; i < dev->mc_count; i++){
		addrs = dmi->dmi_addr;
		dmi   = dmi->next;

		/* multicast address? */
		if (!(*addrs & 1))
			continue;

		crc = ether_crc_le(6, addrs);
		crc = crc >> 26;
		mcast_table [crc >> 4] |= 1 << (crc & 0xf);
	}
	return;
}

static void lance_set_multicast (struct net_device *dev)
{
	struct lance_private *lp = netdev_priv(dev);
	volatile struct lance_init_block *ib = lp->init_block;
	volatile struct lance_regs *ll = lp->ll;

	if (!netif_running(dev))
		return;

	if (lp->tx_old != lp->tx_new) {
		mod_timer(&lp->multicast_timer, jiffies + 4);
		netif_wake_queue(dev);
		return;
	}

	netif_stop_queue(dev);

	ll->rap = LE_CSR0;
	ll->rdp = LE_C0_STOP;
	lance_init_ring (dev);

	if (dev->flags & IFF_PROMISC) {
		ib->mode |= LE_MO_PROM;
	} else {
		ib->mode &= ~LE_MO_PROM;
		lance_load_multicast (dev);
	}
	load_csrs (lp);
	init_restart_lance (lp);
	netif_wake_queue(dev);
}

static int __devinit a2065_init_one(struct zorro_dev *z,
				    const struct zorro_device_id *ent);
static void __devexit a2065_remove_one(struct zorro_dev *z);


static struct zorro_device_id a2065_zorro_tbl[] __devinitdata = {
	{ ZORRO_PROD_CBM_A2065_1 },
	{ ZORRO_PROD_CBM_A2065_2 },
	{ ZORRO_PROD_AMERISTAR_A2065 },
	{ 0 }
};

static struct zorro_driver a2065_driver = {
	.name		= "a2065",
	.id_table	= a2065_zorro_tbl,
	.probe		= a2065_init_one,
	.remove		= __devexit_p(a2065_remove_one),
};

static int __devinit a2065_init_one(struct zorro_dev *z,
				    const struct zorro_device_id *ent)
{
	struct net_device *dev;
	struct lance_private *priv;
	unsigned long board, base_addr, mem_start;
	struct resource *r1, *r2;
	int err;
	DECLARE_MAC_BUF(mac);

	board = z->resource.start;
	base_addr = board+A2065_LANCE;
	mem_start = board+A2065_RAM;

	r1 = request_mem_region(base_addr, sizeof(struct lance_regs),
				"Am7990");
	if (!r1)
		return -EBUSY;
	r2 = request_mem_region(mem_start, A2065_RAM_SIZE, "RAM");
	if (!r2) {
		release_resource(r1);
		return -EBUSY;
	}

	dev = alloc_etherdev(sizeof(struct lance_private));
	if (dev == NULL) {
		release_resource(r1);
		release_resource(r2);
		return -ENOMEM;
	}

	priv = netdev_priv(dev);

	r1->name = dev->name;
	r2->name = dev->name;

	dev->dev_addr[0] = 0x00;
	if (z->id != ZORRO_PROD_AMERISTAR_A2065) {	/* Commodore */
		dev->dev_addr[1] = 0x80;
		dev->dev_addr[2] = 0x10;
	} else {					/* Ameristar */
		dev->dev_addr[1] = 0x00;
		dev->dev_addr[2] = 0x9f;
	}
	dev->dev_addr[3] = (z->rom.er_SerialNumber>>16) & 0xff;
	dev->dev_addr[4] = (z->rom.er_SerialNumber>>8) & 0xff;
	dev->dev_addr[5] = z->rom.er_SerialNumber & 0xff;
	dev->base_addr = ZTWO_VADDR(base_addr);
	dev->mem_start = ZTWO_VADDR(mem_start);
	dev->mem_end = dev->mem_start+A2065_RAM_SIZE;

	priv->ll = (volatile struct lance_regs *)dev->base_addr;
	priv->init_block = (struct lance_init_block *)dev->mem_start;
	priv->lance_init_block = (struct lance_init_block *)A2065_RAM;
	priv->auto_select = 0;
	priv->busmaster_regval = LE_C3_BSWP;

	priv->lance_log_rx_bufs = LANCE_LOG_RX_BUFFERS;
	priv->lance_log_tx_bufs = LANCE_LOG_TX_BUFFERS;
	priv->rx_ring_mod_mask = RX_RING_MOD_MASK;
	priv->tx_ring_mod_mask = TX_RING_MOD_MASK;

	dev->open = &lance_open;
	dev->stop = &lance_close;
	dev->hard_start_xmit = &lance_start_xmit;
	dev->tx_timeout = &lance_tx_timeout;
	dev->watchdog_timeo = 5*HZ;
	dev->set_multicast_list = &lance_set_multicast;
	dev->dma = 0;

	init_timer(&priv->multicast_timer);
	priv->multicast_timer.data = (unsigned long) dev;
	priv->multicast_timer.function =
		(void (*)(unsigned long)) &lance_set_multicast;

	err = register_netdev(dev);
	if (err) {
		release_resource(r1);
		release_resource(r2);
		free_netdev(dev);
		return err;
	}
	zorro_set_drvdata(z, dev);

	printk(KERN_INFO "%s: A2065 at 0x%08lx, Ethernet Address "
	       "%s\n", dev->name, board,
	       print_mac(mac, dev->dev_addr));

	return 0;
}


static void __devexit a2065_remove_one(struct zorro_dev *z)
{
	struct net_device *dev = zorro_get_drvdata(z);

	unregister_netdev(dev);
	release_mem_region(ZTWO_PADDR(dev->base_addr),
			   sizeof(struct lance_regs));
	release_mem_region(ZTWO_PADDR(dev->mem_start), A2065_RAM_SIZE);
	free_netdev(dev);
}

static int __init a2065_init_module(void)
{
	return zorro_register_driver(&a2065_driver);
}

static void __exit a2065_cleanup_module(void)
{
	zorro_unregister_driver(&a2065_driver);
}

module_init(a2065_init_module);
module_exit(a2065_cleanup_module);

MODULE_LICENSE("GPL");