ni5010.c

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	netif_start_queue(dev);
		
	if (NI5010_DEBUG) show_registers(dev); 

	PRINTK((KERN_DEBUG "%s: open successful\n", dev->name));
     	return 0;
}

static void reset_receiver(struct net_device *dev)
{
	int ioaddr = dev->base_addr;
	
	PRINTK3((KERN_DEBUG "%s: resetting receiver\n", dev->name));
	outw(0, IE_GP);		/* Receive packet at start of buffer */
	outb(0xff, EDLC_RCLR);	/* Clear all pending rcv interrupts */
	outb(0, IE_MMODE);	/* Put EDLC to rcv buffer */
	outb(MM_EN_RCV, IE_MMODE); /* Enable rcv */
	outb(0xff, EDLC_RMASK);	/* Enable all rcv interrupts */
}

static void ni5010_timeout(struct net_device *dev)
{
	printk(KERN_WARNING "%s: transmit timed out, %s?\n", dev->name,
		   tx_done(dev) ? "IRQ conflict" : "network cable problem");
	/* Try to restart the adaptor. */
	/* FIXME: Give it a real kick here */
	chipset_init(dev, 1);
	dev->trans_start = jiffies;
	netif_wake_queue(dev);
}

static int ni5010_send_packet(struct sk_buff *skb, struct net_device *dev)
{
	int length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;

	PRINTK2((KERN_DEBUG "%s: entering ni5010_send_packet\n", dev->name));

	/* 
         * Block sending
	 */
	
	netif_stop_queue(dev);
	hardware_send_packet(dev, (unsigned char *)skb->data, length);
	dev->trans_start = jiffies;
	dev_kfree_skb (skb);
	return 0;
}

/* 
 * The typical workload of the driver:
 * Handle the network interface interrupts. 
 */
static void  ni5010_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
	struct net_device *dev = dev_id;
	struct ni5010_local *lp;
	int ioaddr, status;
	int xmit_was_error = 0;

	PRINTK2((KERN_DEBUG "%s: entering ni5010_interrupt\n", dev->name));

	ioaddr = dev->base_addr;
	lp = (struct ni5010_local *)dev->priv;
	
	status = inb(IE_ISTAT); 
	PRINTK3((KERN_DEBUG "%s: IE_ISTAT = %#02x\n", dev->name, status));
		
        if ((status & IS_R_INT) == 0) ni5010_rx(dev);

        if ((status & IS_X_INT) == 0) {
                xmit_was_error = process_xmt_interrupt(dev);
        }

        if ((status & IS_DMA_INT) == 0) {
                PRINTK((KERN_DEBUG "%s: DMA complete (???)\n", dev->name));
                outb(0, IE_DMA_RST); /* Reset DMA int */
        }

	if (!xmit_was_error) 
		reset_receiver(dev); 
	return;
}


static void dump_packet(void *buf, int len)
{
	int i;
	
	printk(KERN_DEBUG "Packet length = %#4x\n", len);
	for (i = 0; i < len; i++){
		if (i % 16 == 0) printk(KERN_DEBUG "%#4.4x", i);
		if (i % 2 == 0) printk(" ");
		printk("%2.2x", ((unsigned char *)buf)[i]);
		if (i % 16 == 15) printk("\n");
	}
	printk("\n");
	
	return;
}

/* We have a good packet, get it out of the buffer. */
static void ni5010_rx(struct net_device *dev)
{
	struct ni5010_local *lp = (struct ni5010_local *)dev->priv;
	int ioaddr = dev->base_addr;
	unsigned char rcv_stat;
	struct sk_buff *skb;
	
	PRINTK2((KERN_DEBUG "%s: entering ni5010_rx()\n", dev->name)); 
	
	rcv_stat = inb(EDLC_RSTAT);
	PRINTK3((KERN_DEBUG "%s: EDLC_RSTAT = %#2x\n", dev->name, rcv_stat)); 
	
	if ( (rcv_stat & RS_VALID_BITS) != RS_PKT_OK) {
		PRINTK((KERN_INFO "%s: receive error.\n", dev->name));
		lp->stats.rx_errors++;
		if (rcv_stat & RS_RUNT) lp->stats.rx_length_errors++;
		if (rcv_stat & RS_ALIGN) lp->stats.rx_frame_errors++;
		if (rcv_stat & RS_CRC_ERR) lp->stats.rx_crc_errors++;
		if (rcv_stat & RS_OFLW) lp->stats.rx_fifo_errors++;
        	outb(0xff, EDLC_RCLR); /* Clear the interrupt */
		return;
	}
	
        outb(0xff, EDLC_RCLR);  /* Clear the interrupt */

	lp->i_pkt_size = inw(IE_RCNT);
	if (lp->i_pkt_size > ETH_FRAME_LEN || lp->i_pkt_size < 10 ) {
		PRINTK((KERN_DEBUG "%s: Packet size error, packet size = %#4.4x\n", 
			dev->name, lp->i_pkt_size));
		lp->stats.rx_errors++;
		lp->stats.rx_length_errors++;
		return;
	}

	/* Malloc up new buffer. */
	skb = dev_alloc_skb(lp->i_pkt_size + 3);
	if (skb == NULL) {
		printk(KERN_WARNING "%s: Memory squeeze, dropping packet.\n", dev->name);
		lp->stats.rx_dropped++;
		return;
	}
	
	skb->dev = dev;
	skb_reserve(skb, 2);
	
	/* Read packet into buffer */
        outb(MM_MUX, IE_MMODE); /* Rcv buffer to system bus */
	outw(0, IE_GP);	/* Seek to beginning of packet */
	insb(IE_RBUF, skb_put(skb, lp->i_pkt_size), lp->i_pkt_size); 
	
	if (NI5010_DEBUG >= 4) 
		dump_packet(skb->data, skb->len); 
		
	skb->protocol = eth_type_trans(skb,dev);
	netif_rx(skb);
	lp->stats.rx_packets++;
	lp->stats.rx_bytes += lp->i_pkt_size;

	PRINTK2((KERN_DEBUG "%s: Received packet, size=%#4.4x\n", 
		dev->name, lp->i_pkt_size));
	
}

static int process_xmt_interrupt(struct net_device *dev)
{
	struct ni5010_local *lp = (struct ni5010_local *)dev->priv;
	int ioaddr = dev->base_addr;
	int xmit_stat;

	PRINTK2((KERN_DEBUG "%s: entering process_xmt_interrupt\n", dev->name));

	xmit_stat = inb(EDLC_XSTAT);
	PRINTK3((KERN_DEBUG "%s: EDLC_XSTAT = %2.2x\n", dev->name, xmit_stat));
	
	outb(0, EDLC_XMASK);	/* Disable xmit IRQ's */
	outb(0xff, EDLC_XCLR);	/* Clear all pending xmit IRQ's */
	
	if (xmit_stat & XS_COLL){
                printk("ether collision\n"); /* FIXME: remove */
		PRINTK((KERN_DEBUG "%s: collision detected, retransmitting\n", 
			dev->name));
		outw(NI5010_BUFSIZE - lp->o_pkt_size, IE_GP);
		/* outb(0, IE_MMODE); */ /* xmt buf on sysbus FIXME: needed ? */
		outb(MM_EN_XMT | MM_MUX, IE_MMODE);
		outb(XM_ALL, EDLC_XMASK); /* Enable xmt IRQ's */
		lp->stats.collisions++;
		return 1;
	}

	/* FIXME: handle other xmt error conditions */

	lp->stats.tx_packets++;
	lp->stats.tx_bytes += lp->o_pkt_size;
	netif_wake_queue(dev);
			
	PRINTK2((KERN_DEBUG "%s: sent packet, size=%#4.4x\n", 
		dev->name, lp->o_pkt_size));

	return 0;
}

/* The inverse routine to ni5010_open(). */
static int ni5010_close(struct net_device *dev)
{
	int ioaddr = dev->base_addr;

	PRINTK2((KERN_DEBUG "%s: entering ni5010_close\n", dev->name));
#ifdef jumpered_interrupts	
	free_irq(dev->irq, NULL);
#endif
	/* Put card in held-RESET state */
	outb(0, IE_MMODE);
	outb(RS_RESET, EDLC_RESET);

	netif_stop_queue(dev);
	
	PRINTK((KERN_DEBUG "%s: %s closed down\n", dev->name, boardname));
	return 0;

}

/* Get the current statistics.	This may be called with the card open or
   closed. */
static struct net_device_stats *ni5010_get_stats(struct net_device *dev)
{
	struct ni5010_local *lp = (struct ni5010_local *)dev->priv;

	PRINTK2((KERN_DEBUG "%s: entering ni5010_get_stats\n", dev->name));
	
	if (NI5010_DEBUG) show_registers(dev);
	
	/* cli(); */
	/* Update the statistics from the device registers. */
	/* We do this in the interrupt handler */
	/* sti(); */

	return &lp->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 ni5010_set_multicast_list(struct net_device *dev)
{
	short ioaddr = dev->base_addr;  

	PRINTK2((KERN_DEBUG "%s: entering set_multicast_list\n", dev->name));

	if (dev->flags&IFF_PROMISC || dev->flags&IFF_ALLMULTI) {
		dev->flags |= IFF_PROMISC;
		outb(RMD_PROMISC, EDLC_RMODE); /* Enable promiscuous mode */
		PRINTK((KERN_DEBUG "%s: Entering promiscuous mode\n", dev->name));
	} else if (dev->mc_list) {
		/* Sorry, multicast not supported */
		PRINTK((KERN_DEBUG "%s: No multicast, entering broadcast mode\n", dev->name));
		outb(RMD_BROADCAST, EDLC_RMODE);
	} else {
		PRINTK((KERN_DEBUG "%s: Entering broadcast mode\n", dev->name));
		outb(RMD_BROADCAST, EDLC_RMODE);  /* Disable promiscuous mode, use normal mode */
	}
}

static void hardware_send_packet(struct net_device *dev, char *buf, int length)
{
	struct ni5010_local *lp = (struct ni5010_local *)dev->priv;
	int ioaddr = dev->base_addr;
	unsigned long flags;
	unsigned int buf_offs;

	PRINTK2((KERN_DEBUG "%s: entering hardware_send_packet\n", dev->name));
	
        if (length > ETH_FRAME_LEN) {
                PRINTK((KERN_WARNING "%s: packet too large, not possible\n",
                        dev->name));
                return;
        }

	if (NI5010_DEBUG) show_registers(dev);

	if (inb(IE_ISTAT) & IS_EN_XMT) {
		PRINTK((KERN_WARNING "%s: sending packet while already transmitting, not possible\n", 
			dev->name));
		return;
	}
	
	if (NI5010_DEBUG > 3) dump_packet(buf, length);

        buf_offs = NI5010_BUFSIZE - length;
        lp->o_pkt_size = length;

	save_flags(flags);	
	cli();

	outb(0, EDLC_RMASK);	/* Mask all receive interrupts */
	outb(0, IE_MMODE);	/* Put Xmit buffer on system bus */
	outb(0xff, EDLC_RCLR);	/* Clear out pending rcv interrupts */

	outw(buf_offs, IE_GP); /* Point GP at start of packet */
	outsb(IE_XBUF, buf, length); /* Put data in buffer */
	outw(buf_offs, IE_GP); /* Rewrite where packet starts */

	/* should work without that outb() (Crynwr used it) */
	/*outb(MM_MUX, IE_MMODE);*/ /* Xmt buffer to EDLC bus */
	outb(MM_EN_XMT | MM_MUX, IE_MMODE); /* Begin transmission */
	outb(XM_ALL, EDLC_XMASK); /* Cause interrupt after completion or fail */

	restore_flags(flags);

	netif_wake_queue(dev);
	
	if (NI5010_DEBUG) show_registers(dev);	
}

static void chipset_init(struct net_device *dev, int startp)
{
	/* FIXME: Move some stuff here */
	PRINTK3((KERN_DEBUG "%s: doing NOTHING in chipset_init\n", dev->name));
}

static void show_registers(struct net_device *dev)
{
	int ioaddr = dev->base_addr;
	
	PRINTK3((KERN_DEBUG "%s: XSTAT %#2.2x\n", dev->name, inb(EDLC_XSTAT)));
	PRINTK3((KERN_DEBUG "%s: XMASK %#2.2x\n", dev->name, inb(EDLC_XMASK)));
	PRINTK3((KERN_DEBUG "%s: RSTAT %#2.2x\n", dev->name, inb(EDLC_RSTAT)));
	PRINTK3((KERN_DEBUG "%s: RMASK %#2.2x\n", dev->name, inb(EDLC_RMASK)));
	PRINTK3((KERN_DEBUG "%s: RMODE %#2.2x\n", dev->name, inb(EDLC_RMODE)));
	PRINTK3((KERN_DEBUG "%s: XMODE %#2.2x\n", dev->name, inb(EDLC_XMODE)));
	PRINTK3((KERN_DEBUG "%s: ISTAT %#2.2x\n", dev->name, inb(IE_ISTAT)));
}

#ifdef MODULE
static struct net_device dev_ni5010;
static int io;
static int irq;

MODULE_PARM(io, "i");
MODULE_PARM(irq, "i");

int init_module(void)
{
	int result;
	
	PRINTK2((KERN_DEBUG "%s: entering init_module\n", boardname));
	/*
	if(io <= 0 || irq == 0){
	   	printk(KERN_WARNING "%s: Autoprobing not allowed for modules.\n", boardname);
		printk(KERN_WARNING "%s: Set symbols 'io' and 'irq'\n", boardname);
	   	return -EINVAL;
	}
	*/
	if (io <= 0){
		printk(KERN_WARNING "%s: Autoprobing for modules is hazardous, trying anyway..\n", boardname);
	}

	PRINTK2((KERN_DEBUG "%s: init_module irq=%#2x, io=%#3x\n", boardname, irq, io));
        dev_ni5010.irq=irq;
        dev_ni5010.base_addr=io;
	dev_ni5010.init=ni5010_probe;
        if ((result = register_netdev(&dev_ni5010)) != 0) {
        	PRINTK((KERN_WARNING "%s: register_netdev returned %d.\n", 
        		boardname, result));
                return -EIO;
        }
        return 0;
}

void
cleanup_module(void)
{
	PRINTK2((KERN_DEBUG "%s: entering cleanup_module\n", boardname));

        unregister_netdev(&dev_ni5010);

	release_region(dev_ni5010.base_addr, NI5010_IO_EXTENT);
	if (dev_ni5010.priv != NULL){
	        kfree(dev_ni5010.priv);
	        dev_ni5010.priv = NULL;
	}
}
#endif /* MODULE */

/*
 * Local variables:
 *  compile-command: "gcc -D__KERNEL__ -I/usr/src/linux/net/inet -Wall -Wstrict-prototypes -O6 -m486 -c ni5010.c"
 *  version-control: t
 *  kept-new-versions: 5
 *  tab-width: 4
 * End:
 */