ether3.c

arm平台上的uclinux系统全部源代码

ether3_probe(struct device *dev)
{
	struct expansion_card *ec;

	if (!dev)
		return ENODEV;

	ecard_startfind();

	if ((ec = ecard_find(0, ether3_cids)) == NULL)
		return ENODEV;

	ether3_get_dev(dev, ec);

	return ether3_probe1(dev);
}
#endif

/*
 * Open/initialize the board.  This is called (in the current kernel)
 * sometime after booting when the 'ifconfig' program is run.
 *
 * This routine should set everything up anew at each open, even
 * registers that "should" only need to be set once at boot, so that
 * there is non-reboot way to recover if something goes wrong.
 */
static int
ether3_open(struct device *dev)
{
	MOD_INC_USE_COUNT;

	if (request_irq(dev->irq, ether3_interrupt, 0, "ether3", dev)) {
	    	MOD_DEC_USE_COUNT;
		return -EAGAIN;
	}

	dev->tbusy = 0;
	dev->interrupt = 0;
	dev->start = 1;

	ether3_init_for_open(dev);

	return 0;
}

/*
 * The inverse routine to ether3_open().
 */
static int
ether3_close(struct device *dev)
{
	struct dev_priv *priv = (struct dev_priv *)dev->priv;

	dev->tbusy = 1;
	dev->start = 0;

	disable_irq(dev->irq);

	ether3_outw(CMD_RXOFF|CMD_TXOFF, REG_COMMAND);
	priv->regs.command = 0;
	while (ether3_inw(REG_STATUS) & (STAT_RXON|STAT_TXON));
	ether3_outb(0x80, REG_CONFIG2 + 1);
	ether3_outw(0, REG_COMMAND);

	free_irq(dev->irq, dev);

	MOD_DEC_USE_COUNT;
	return 0;
}

/*
 * Get the current statistics.	This may be called with the card open or
 * closed.
 */
static struct enet_statistics *ether3_getstats(struct device *dev)
{
	struct dev_priv *priv = (struct dev_priv *)dev->priv;
	return &priv->stats;
}

/*
 * Set or clear promiscuous/multicast mode filter for this adaptor.
 *
 * We don't attempt any packet filtering.  The card may have a SEEQ 8004
 * in which does not have the other ethernet address registers present...
 */
static void ether3_setmulticastlist(struct device *dev)
{
	struct dev_priv *priv = (struct dev_priv *)dev->priv;

	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);
}

/*
 * Transmit a packet
 */
static int
ether3_sendpacket(struct sk_buff *skb, struct device *dev)
{
	struct dev_priv *priv = (struct dev_priv *)dev->priv;
retry:
	if (!dev->tbusy) {
		if (skb) {
		    /* Block a timer-based transmit from overlapping. */
		    if (!set_bit(0, (void *)&dev->tbusy)) {
		    	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, FREE_WRITE);
				priv->stats.tx_dropped ++;
				dev->tbusy = 0;
				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;
			if (priv->tx_tail != next_ptr)
				dev->tbusy = 0;

			restore_flags(flags);

			dev_kfree_skb(skb, FREE_WRITE);

			return 0;
		    } else {
			printk("%s: transmitter access conflict.\n", dev->name);
			return 1;
		    }
		} else {
		    /* If some higher layer thinks we've missed an tx-done interrupt
		     * we are passed NULL. Caution: dev_tint() handles the cli()/sti()
		     * itself.
		     */
		    dev_tint(dev);
		    return 0;
		}
	} else {
		/* If we get here, some higher level has decided we are broken.
		 * There should really be a "kick me" function call instead.
		 */
		int tickssofar = jiffies - dev->trans_start;
		unsigned long flags;

		if (tickssofar < 5)
			return 1;
		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);

		dev->tbusy = 0;
		priv->regs.config2 |= CFG2_CTRLO;
		priv->stats.tx_errors += 1;
		ether3_outw(priv->regs.config2, REG_CONFIG2);
		dev->trans_start = jiffies;
		priv->tx_head = priv->tx_tail = 0;
		goto retry;
	}
}

static void
ether3_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
	struct device *dev = (struct 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;

	dev->interrupt = 1;

	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);
	}

	dev->interrupt = 0;

#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 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 enet_statistics *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 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);
//printk("%s: processing tx packet @ %04X (status=%08lX)\n", dev->name, tx_tail, status);

		/*
		 * 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;
		dev->tbusy = 0;
		mark_bh(NET_BH);	/* Inform upper layers. */
	}
}

#ifdef MODULE

char ethernames[MAX_ECARDS][9];

static struct device *my_ethers[MAX_ECARDS];
static struct expansion_card *ec[MAX_ECARDS];

int
init_module(void)
{
	int i;

	for(i = 0; i < MAX_ECARDS; i++) {
		my_ethers[i] = NULL;
		ec[i] = NULL;
		strcpy(ethernames[i], "        ");
	}

	i = 0;

	ecard_startfind();

	do {
		if ((ec[i] = ecard_find(0, ether3_cids)) == NULL)
			break;

		my_ethers[i] = (struct device *)kmalloc(sizeof(struct device), GFP_KERNEL);
		memset(my_ethers[i], 0, sizeof(struct device));

		my_ethers[i]->init = ether3_probe1;
		my_ethers[i]->name = ethernames[i];

		ether3_get_dev(my_ethers[i], ec[i]);

		if(register_netdev(my_ethers[i]) != 0) {
			for (i = 0; i < MAX_ECARDS; i++) {
				if(my_ethers[i]) {
					kfree(my_ethers[i]);
					my_ethers[i] = NULL;
				}
				if(ec[i]) {
					ecard_release(ec[i]);
					ec[i] = NULL;
				}
			}
			return -EIO;
		}
		i++;
	}
	while(i < MAX_ECARDS);

	return i != 0 ? 0 : -ENODEV;
}

void
cleanup_module(void)
{
	int i;
	for (i = 0; i < MAX_ECARDS; i++) {
		if (my_ethers[i]) {
		  	release_region(my_ethers[i]->base_addr, 128);
			unregister_netdev(my_ethers[i]);
			my_ethers[i] = NULL;
		}
		if (ec[i]) {
			ecard_release(ec[i]);
			ec[i] = NULL;
		}
	}
}
#endif /* MODULE */