axnet_cs.c

linux-2.6.15.6

	printk("\n");
#endif

	if (tx_was_aborted)
		ei_tx_intr(dev);
	else 
	{
		ei_local->stat.tx_errors++;
		if (txsr & ENTSR_CRS) ei_local->stat.tx_carrier_errors++;
		if (txsr & ENTSR_CDH) ei_local->stat.tx_heartbeat_errors++;
		if (txsr & ENTSR_OWC) ei_local->stat.tx_window_errors++;
	}
}

/**
 * ei_tx_intr - transmit interrupt handler
 * @dev: network device for which tx intr is handled
 *
 * We have finished a transmit: check for errors and then trigger the next
 * packet to be sent. Called with lock held.
 */

static void ei_tx_intr(struct net_device *dev)
{
	long e8390_base = dev->base_addr;
	struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
	int status = inb(e8390_base + EN0_TSR);
    
	/*
	 * There are two Tx buffers, see which one finished, and trigger
	 * the send of another one if it exists.
	 */
	ei_local->txqueue--;

	if (ei_local->tx1 < 0) 
	{
		if (ei_local->lasttx != 1 && ei_local->lasttx != -1)
			printk(KERN_ERR "%s: bogus last_tx_buffer %d, tx1=%d.\n",
				ei_local->name, ei_local->lasttx, ei_local->tx1);
		ei_local->tx1 = 0;
		if (ei_local->tx2 > 0) 
		{
			ei_local->txing = 1;
			NS8390_trigger_send(dev, ei_local->tx2, ei_local->tx_start_page + 6);
			dev->trans_start = jiffies;
			ei_local->tx2 = -1,
			ei_local->lasttx = 2;
		}
		else ei_local->lasttx = 20, ei_local->txing = 0;	
	}
	else if (ei_local->tx2 < 0) 
	{
		if (ei_local->lasttx != 2  &&  ei_local->lasttx != -2)
			printk("%s: bogus last_tx_buffer %d, tx2=%d.\n",
				ei_local->name, ei_local->lasttx, ei_local->tx2);
		ei_local->tx2 = 0;
		if (ei_local->tx1 > 0) 
		{
			ei_local->txing = 1;
			NS8390_trigger_send(dev, ei_local->tx1, ei_local->tx_start_page);
			dev->trans_start = jiffies;
			ei_local->tx1 = -1;
			ei_local->lasttx = 1;
		}
		else
			ei_local->lasttx = 10, ei_local->txing = 0;
	}
//	else printk(KERN_WARNING "%s: unexpected TX-done interrupt, lasttx=%d.\n",
//			dev->name, ei_local->lasttx);

	/* Minimize Tx latency: update the statistics after we restart TXing. */
	if (status & ENTSR_COL)
		ei_local->stat.collisions++;
	if (status & ENTSR_PTX)
		ei_local->stat.tx_packets++;
	else 
	{
		ei_local->stat.tx_errors++;
		if (status & ENTSR_ABT) 
		{
			ei_local->stat.tx_aborted_errors++;
			ei_local->stat.collisions += 16;
		}
		if (status & ENTSR_CRS) 
			ei_local->stat.tx_carrier_errors++;
		if (status & ENTSR_FU) 
			ei_local->stat.tx_fifo_errors++;
		if (status & ENTSR_CDH)
			ei_local->stat.tx_heartbeat_errors++;
		if (status & ENTSR_OWC)
			ei_local->stat.tx_window_errors++;
	}
	netif_wake_queue(dev);
}

/**
 * ei_receive - receive some packets
 * @dev: network device with which receive will be run
 *
 * We have a good packet(s), get it/them out of the buffers. 
 * Called with lock held.
 */

static void ei_receive(struct net_device *dev)
{
	long e8390_base = dev->base_addr;
	struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
	unsigned char rxing_page, this_frame, next_frame;
	unsigned short current_offset;
	int rx_pkt_count = 0;
	struct e8390_pkt_hdr rx_frame;
    
	while (++rx_pkt_count < 10) 
	{
		int pkt_len, pkt_stat;
		
		/* Get the rx page (incoming packet pointer). */
		rxing_page = inb_p(e8390_base + EN1_CURPAG -1);
		
		/* Remove one frame from the ring.  Boundary is always a page behind. */
		this_frame = inb_p(e8390_base + EN0_BOUNDARY) + 1;
		if (this_frame >= ei_local->stop_page)
			this_frame = ei_local->rx_start_page;
		
		/* Someday we'll omit the previous, iff we never get this message.
		   (There is at least one clone claimed to have a problem.)  
		   
		   Keep quiet if it looks like a card removal. One problem here
		   is that some clones crash in roughly the same way.
		 */
		if (ei_debug > 0  &&  this_frame != ei_local->current_page && (this_frame!=0x0 || rxing_page!=0xFF))
			printk(KERN_ERR "%s: mismatched read page pointers %2x vs %2x.\n",
				   dev->name, this_frame, ei_local->current_page);
		
		if (this_frame == rxing_page)	/* Read all the frames? */
			break;				/* Done for now */
		
		current_offset = this_frame << 8;
		ei_get_8390_hdr(dev, &rx_frame, this_frame);
		
		pkt_len = rx_frame.count - sizeof(struct e8390_pkt_hdr);
		pkt_stat = rx_frame.status;
		
		next_frame = this_frame + 1 + ((pkt_len+4)>>8);
		
		if (pkt_len < 60  ||  pkt_len > 1518) 
		{
			if (ei_debug)
				printk(KERN_DEBUG "%s: bogus packet size: %d, status=%#2x nxpg=%#2x.\n",
					   dev->name, rx_frame.count, rx_frame.status,
					   rx_frame.next);
			ei_local->stat.rx_errors++;
			ei_local->stat.rx_length_errors++;
		}
		 else if ((pkt_stat & 0x0F) == ENRSR_RXOK) 
		{
			struct sk_buff *skb;
			
			skb = dev_alloc_skb(pkt_len+2);
			if (skb == NULL) 
			{
				if (ei_debug > 1)
					printk(KERN_DEBUG "%s: Couldn't allocate a sk_buff of size %d.\n",
						   dev->name, pkt_len);
				ei_local->stat.rx_dropped++;
				break;
			}
			else
			{
				skb_reserve(skb,2);	/* IP headers on 16 byte boundaries */
				skb->dev = dev;
				skb_put(skb, pkt_len);	/* Make room */
				ei_block_input(dev, pkt_len, skb, current_offset + sizeof(rx_frame));
				skb->protocol=eth_type_trans(skb,dev);
				netif_rx(skb);
				dev->last_rx = jiffies;
				ei_local->stat.rx_packets++;
				ei_local->stat.rx_bytes += pkt_len;
				if (pkt_stat & ENRSR_PHY)
					ei_local->stat.multicast++;
			}
		} 
		else 
		{
			if (ei_debug)
				printk(KERN_DEBUG "%s: bogus packet: status=%#2x nxpg=%#2x size=%d\n",
					   dev->name, rx_frame.status, rx_frame.next,
					   rx_frame.count);
			ei_local->stat.rx_errors++;
			/* NB: The NIC counts CRC, frame and missed errors. */
			if (pkt_stat & ENRSR_FO)
				ei_local->stat.rx_fifo_errors++;
		}
		next_frame = rx_frame.next;
		
		/* This _should_ never happen: it's here for avoiding bad clones. */
		if (next_frame >= ei_local->stop_page) {
			printk("%s: next frame inconsistency, %#2x\n", dev->name,
				   next_frame);
			next_frame = ei_local->rx_start_page;
		}
		ei_local->current_page = next_frame;
		outb_p(next_frame-1, e8390_base+EN0_BOUNDARY);
	}

	return;
}

/**
 * ei_rx_overrun - handle receiver overrun
 * @dev: network device which threw exception
 *
 * We have a receiver overrun: we have to kick the 8390 to get it started
 * again. Problem is that you have to kick it exactly as NS prescribes in
 * the updated datasheets, or "the NIC may act in an unpredictable manner."
 * This includes causing "the NIC to defer indefinitely when it is stopped
 * on a busy network."  Ugh.
 * Called with lock held. Don't call this with the interrupts off or your
 * computer will hate you - it takes 10ms or so. 
 */

static void ei_rx_overrun(struct net_device *dev)
{
	axnet_dev_t *info = (axnet_dev_t *)dev;
	long e8390_base = dev->base_addr;
	unsigned char was_txing, must_resend = 0;
	struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
    
	/*
	 * Record whether a Tx was in progress and then issue the
	 * stop command.
	 */
	was_txing = inb_p(e8390_base+E8390_CMD) & E8390_TRANS;
	outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD);
    
	if (ei_debug > 1)
		printk(KERN_DEBUG "%s: Receiver overrun.\n", dev->name);
	ei_local->stat.rx_over_errors++;
    
	/* 
	 * Wait a full Tx time (1.2ms) + some guard time, NS says 1.6ms total.
	 * Early datasheets said to poll the reset bit, but now they say that
	 * it "is not a reliable indicator and subsequently should be ignored."
	 * We wait at least 10ms.
	 */

	mdelay(10);

	/*
	 * Reset RBCR[01] back to zero as per magic incantation.
	 */
	outb_p(0x00, e8390_base+EN0_RCNTLO);
	outb_p(0x00, e8390_base+EN0_RCNTHI);

	/*
	 * See if any Tx was interrupted or not. According to NS, this
	 * step is vital, and skipping it will cause no end of havoc.
	 */

	if (was_txing)
	{ 
		unsigned char tx_completed = inb_p(e8390_base+EN0_ISR) & (ENISR_TX+ENISR_TX_ERR);
		if (!tx_completed)
			must_resend = 1;
	}

	/*
	 * Have to enter loopback mode and then restart the NIC before
	 * you are allowed to slurp packets up off the ring.
	 */
	outb_p(E8390_TXOFF, e8390_base + EN0_TXCR);
	outb_p(E8390_NODMA + E8390_PAGE0 + E8390_START, e8390_base + E8390_CMD);

	/*
	 * Clear the Rx ring of all the debris, and ack the interrupt.
	 */
	ei_receive(dev);

	/*
	 * Leave loopback mode, and resend any packet that got stopped.
	 */
	outb_p(E8390_TXCONFIG | info->duplex_flag, e8390_base + EN0_TXCR); 
	if (must_resend)
    		outb_p(E8390_NODMA + E8390_PAGE0 + E8390_START + E8390_TRANS, e8390_base + E8390_CMD);
}

/*
 *	Collect the stats. This is called unlocked and from several contexts.
 */
 
static struct net_device_stats *get_stats(struct net_device *dev)
{
	long ioaddr = dev->base_addr;
	struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
	unsigned long flags;
    
	/* If the card is stopped, just return the present stats. */
	if (!netif_running(dev))
		return &ei_local->stat;

	spin_lock_irqsave(&ei_local->page_lock,flags);
	/* Read the counter registers, assuming we are in page 0. */
	ei_local->stat.rx_frame_errors += inb_p(ioaddr + EN0_COUNTER0);
	ei_local->stat.rx_crc_errors   += inb_p(ioaddr + EN0_COUNTER1);
	ei_local->stat.rx_missed_errors+= inb_p(ioaddr + EN0_COUNTER2);
	spin_unlock_irqrestore(&ei_local->page_lock, flags);
    
	return &ei_local->stat;
}

/**
 * do_set_multicast_list - set/clear multicast filter
 * @dev: net device for which multicast filter is adjusted
 *
 *	Set or clear the multicast filter for this adaptor. May be called
 *	from a BH in 2.1.x. Must be called with lock held. 
 */
 
static void do_set_multicast_list(struct net_device *dev)
{
	long e8390_base = dev->base_addr;

  	if(dev->flags&IFF_PROMISC)
  		outb_p(E8390_RXCONFIG | 0x58, e8390_base + EN0_RXCR);
	else if(dev->flags&IFF_ALLMULTI || dev->mc_list)
  		outb_p(E8390_RXCONFIG | 0x48, e8390_base + EN0_RXCR);
  	else
  		outb_p(E8390_RXCONFIG | 0x40, e8390_base + EN0_RXCR);
}

/*
 *	Called without lock held. This is invoked from user context and may
 *	be parallel to just about everything else. Its also fairly quick and
 *	not called too often. Must protect against both bh and irq users
 */

static void set_multicast_list(struct net_device *dev)
{
	unsigned long flags;

	spin_lock_irqsave(&dev_lock(dev), flags);
	do_set_multicast_list(dev);
	spin_unlock_irqrestore(&dev_lock(dev), flags);
}	

/**
 * axdev_setup - init rest of 8390 device struct
 * @dev: network device structure to init
 *
 * Initialize the rest of the 8390 device structure.  Do NOT __init
 * this, as it is used by 8390 based modular drivers too.
 */

static void axdev_setup(struct net_device *dev)
{
	struct ei_device *ei_local;
	if (ei_debug > 1)
		printk(version_8390);
    
	SET_MODULE_OWNER(dev);

		
	ei_local = (struct ei_device *)netdev_priv(dev);
	spin_lock_init(&ei_local->page_lock);
    
	dev->hard_start_xmit = &ei_start_xmit;
	dev->get_stats	= get_stats;
	dev->set_multicast_list = &set_multicast_list;

	ether_setup(dev);
}

/* This page of functions should be 8390 generic */
/* Follow National Semi's recommendations for initializing the "NIC". */

/**
 * AX88190_init - initialize 8390 hardware
 * @dev: network device to initialize
 * @startp: boolean.  non-zero value to initiate chip processing
 *
 *	Must be called with lock held.
 */

static void AX88190_init(struct net_device *dev, int startp)
{
	axnet_dev_t *info = PRIV(dev);
	long e8390_base = dev->base_addr;
	struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
	int i;
	int endcfg = ei_local->word16 ? (0x48 | ENDCFG_WTS) : 0x48;
    
	if(sizeof(struct e8390_pkt_hdr)!=4)
    		panic("8390.c: header struct mispacked\n");    
	/* Follow National Semi's recommendations for initing the DP83902. */
	outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD); /* 0x21 */
	outb_p(endcfg, e8390_base + EN0_DCFG);	/* 0x48 or 0x49 */
	/* Clear the remote byte count registers. */
	outb_p(0x00,  e8390_base + EN0_RCNTLO);
	outb_p(0x00,  e8390_base + EN0_RCNTHI);
	/* Set to monitor and loopback mode -- this is vital!. */
	outb_p(E8390_RXOFF|0x40, e8390_base + EN0_RXCR); /* 0x60 */
	outb_p(E8390_TXOFF, e8390_base + EN0_TXCR); /* 0x02 */
	/* Set the transmit page and receive ring. */
	outb_p(ei_local->tx_start_page, e8390_base + EN0_TPSR);
	ei_local->tx1 = ei_local->tx2 = 0;
	outb_p(ei_local->rx_start_page, e8390_base + EN0_STARTPG);
	outb_p(ei_local->stop_page-1, e8390_base + EN0_BOUNDARY);	/* 3c503 says 0x3f,NS0x26*/
	ei_local->current_page = ei_local->rx_start_page;		/* assert boundary+1 */
	outb_p(ei_local->stop_page, e8390_base + EN0_STOPPG);
	/* Clear the pending interrupts and mask. */
	outb_p(0xFF, e8390_base + EN0_ISR);
	outb_p(0x00,  e8390_base + EN0_IMR);
    
	/* Copy the station address into the DS8390 registers. */

	outb_p(E8390_NODMA + E8390_PAGE1 + E8390_STOP, e8390_base+E8390_CMD); /* 0x61 */
	for(i = 0; i < 6; i++) 
	{
		outb_p(dev->dev_addr[i], e8390_base + EN1_PHYS_SHIFT(i));
		if(inb_p(e8390_base + EN1_PHYS_SHIFT(i))!=dev->dev_addr[i])
			printk(KERN_ERR "Hw. address read/write mismap %d\n",i);
	}
	/*
	 * Initialize the multicast list to accept-all.  If we enable multicast
	 * the higher levels can do the filtering.
	 */
	for (i = 0; i < 8; i++)
		outb_p(0xff, e8390_base + EN1_MULT + i);

	outb_p(ei_local->rx_start_page, e8390_base + EN1_CURPAG);
	outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD);

	netif_start_queue(dev);
	ei_local->tx1 = ei_local->tx2 = 0;
	ei_local->txing = 0;

	if (startp) 
	{
		outb_p(0xff,  e8390_base + EN0_ISR);
		outb_p(ENISR_ALL,  e8390_base + EN0_IMR);
		outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base+E8390_CMD);
		outb_p(E8390_TXCONFIG | info->duplex_flag,
		       e8390_base + EN0_TXCR); /* xmit on. */
		/* 3c503 TechMan says rxconfig only after the NIC is started. */
		outb_p(E8390_RXCONFIG | 0x40, e8390_base + EN0_RXCR); /* rx on, */
		do_set_multicast_list(dev);	/* (re)load the mcast table */
	}
}

/* Trigger a transmit start, assuming the length is valid. 
   Always called with the page lock held */
   
static void NS8390_trigger_send(struct net_device *dev, unsigned int length,
								int start_page)
{
	long e8390_base = dev->base_addr;
 	struct ei_device *ei_local __attribute((unused)) = (struct ei_device *) netdev_priv(dev);
    
	if (inb_p(e8390_base) & E8390_TRANS) 
	{
		printk(KERN_WARNING "%s: trigger_send() called with the transmitter busy.\n",
			dev->name);
		return;
	}
	outb_p(length & 0xff, e8390_base + EN0_TCNTLO);
	outb_p(length >> 8, e8390_base + EN0_TCNTHI);
	outb_p(start_page, e8390_base + EN0_TPSR);
	outb_p(E8390_NODMA+E8390_TRANS+E8390_START, e8390_base+E8390_CMD);
}