3c523.c

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		elmc_attn586();	/* ack inter. */

		if (stat & STAT_CX) {
			/* command with I-bit set complete */
			elmc_xmt_int(dev);
		}
		if (stat & STAT_FR) {
			/* received a frame */
			elmc_rcv_int(dev);
		}
#ifndef NO_NOPCOMMANDS
		if (stat & STAT_CNA) {
			/* CU went 'not ready' */
			if (netif_running(dev)) {
				printk(KERN_WARNING "%s: oops! CU has left active state. stat: %04x/%04x.\n", dev->name, (int) stat, (int) p->scb->status);
			}
		}
#endif

		if (stat & STAT_RNR) {
			/* RU went 'not ready' */

			if (p->scb->status & RU_SUSPEND) {
				/* special case: RU_SUSPEND */

				WAIT_4_SCB_CMD();
				p->scb->cmd = RUC_RESUME;
				elmc_attn586();
			} else {
				printk(KERN_WARNING "%s: Receiver-Unit went 'NOT READY': %04x/%04x.\n", dev->name, (int) stat, (int) p->scb->status);
				elmc_rnr_int(dev);
			}
		}
		WAIT_4_SCB_CMD();	/* wait for ack. (elmc_xmt_int can be faster than ack!!) */
		if (p->scb->cmd) {	/* timed out? */
			break;
		}
	}
}

/*******************************************************
 * receive-interrupt
 */

static void elmc_rcv_int(struct net_device *dev)
{
	int status;
	unsigned short totlen;
	struct sk_buff *skb;
	struct rbd_struct *rbd;
	struct priv *p = (struct priv *) dev->priv;

	for (; (status = p->rfd_top->status) & STAT_COMPL;) {
		rbd = (struct rbd_struct *) make32(p->rfd_top->rbd_offset);

		if (status & STAT_OK) {		/* frame received without error? */
			if ((totlen = rbd->status) & RBD_LAST) {	/* the first and the last buffer? */
				totlen &= RBD_MASK;	/* length of this frame */
				rbd->status = 0;
				skb = (struct sk_buff *) dev_alloc_skb(totlen + 2);
				if (skb != NULL) {
					skb->dev = dev;
					skb_reserve(skb, 2);	/* 16 byte alignment */
					skb_put(skb,totlen);
					eth_copy_and_sum(skb, (char *) p->base+(unsigned long) rbd->buffer,totlen,0);
					skb->protocol = eth_type_trans(skb, dev);
					netif_rx(skb);
					dev->last_rx = jiffies;
					p->stats.rx_packets++;
					p->stats.rx_bytes += totlen;
				} else {
					p->stats.rx_dropped++;
				}
			} else {
				printk(KERN_WARNING "%s: received oversized frame.\n", dev->name);
				p->stats.rx_dropped++;
			}
		} else {	/* frame !(ok), only with 'save-bad-frames' */
			printk(KERN_WARNING "%s: oops! rfd-error-status: %04x\n", dev->name, status);
			p->stats.rx_errors++;
		}
		p->rfd_top->status = 0;
		p->rfd_top->last = RFD_SUSP;
		p->rfd_last->last = 0;	/* delete RU_SUSP  */
		p->rfd_last = p->rfd_top;
		p->rfd_top = (struct rfd_struct *) make32(p->rfd_top->next);	/* step to next RFD */
	}
}

/**********************************************************
 * handle 'Receiver went not ready'.
 */

static void elmc_rnr_int(struct net_device *dev)
{
	struct priv *p = (struct priv *) dev->priv;

	p->stats.rx_errors++;

	WAIT_4_SCB_CMD();	/* wait for the last cmd */
	p->scb->cmd = RUC_ABORT;	/* usually the RU is in the 'no resource'-state .. abort it now. */
	elmc_attn586();
	WAIT_4_SCB_CMD();	/* wait for accept cmd. */

	alloc_rfa(dev, (char *) p->rfd_first);
	startrecv586(dev);	/* restart RU */

	printk(KERN_WARNING "%s: Receive-Unit restarted. Status: %04x\n", dev->name, p->scb->status);

}

/**********************************************************
 * handle xmit - interrupt
 */

static void elmc_xmt_int(struct net_device *dev)
{
	int status;
	struct priv *p = (struct priv *) dev->priv;

	status = p->xmit_cmds[p->xmit_last]->cmd_status;
	if (!(status & STAT_COMPL)) {
		printk(KERN_WARNING "%s: strange .. xmit-int without a 'COMPLETE'\n", dev->name);
	}
	if (status & STAT_OK) {
		p->stats.tx_packets++;
		p->stats.collisions += (status & TCMD_MAXCOLLMASK);
	} else {
		p->stats.tx_errors++;
		if (status & TCMD_LATECOLL) {
			printk(KERN_WARNING "%s: late collision detected.\n", dev->name);
			p->stats.collisions++;
		} else if (status & TCMD_NOCARRIER) {
			p->stats.tx_carrier_errors++;
			printk(KERN_WARNING "%s: no carrier detected.\n", dev->name);
		} else if (status & TCMD_LOSTCTS) {
			printk(KERN_WARNING "%s: loss of CTS detected.\n", dev->name);
		} else if (status & TCMD_UNDERRUN) {
			p->stats.tx_fifo_errors++;
			printk(KERN_WARNING "%s: DMA underrun detected.\n", dev->name);
		} else if (status & TCMD_MAXCOLL) {
			printk(KERN_WARNING "%s: Max. collisions exceeded.\n", dev->name);
			p->stats.collisions += 16;
		}
	}

#if (NUM_XMIT_BUFFS != 1)
	if ((++p->xmit_last) == NUM_XMIT_BUFFS) {
		p->xmit_last = 0;
	}
#endif

	netif_wake_queue(dev);
}

/***********************************************************
 * (re)start the receiver
 */

static void startrecv586(struct net_device *dev)
{
	struct priv *p = (struct priv *) dev->priv;

	p->scb->rfa_offset = make16(p->rfd_first);
	p->scb->cmd = RUC_START;
	elmc_attn586();		/* start cmd. */
	WAIT_4_SCB_CMD();	/* wait for accept cmd. (no timeout!!) */
}

/******************************************************
 * timeout
 */
 
static void elmc_timeout(struct net_device *dev)
{
	struct priv *p = (struct priv *) dev->priv;
	/* COMMAND-UNIT active? */
	if (p->scb->status & CU_ACTIVE) {
#ifdef DEBUG
		printk("%s: strange ... timeout with CU active?!?\n", dev->name);
		printk("%s: X0: %04x N0: %04x N1: %04x %d\n", dev->name, (int) p->xmit_cmds[0]->cmd_status, (int) p->nop_cmds[0]->cmd_status, (int) p->nop_cmds[1]->cmd_status, (int) p->nop_point);
#endif
		p->scb->cmd = CUC_ABORT;
		elmc_attn586();
		WAIT_4_SCB_CMD();
		p->scb->cbl_offset = make16(p->nop_cmds[p->nop_point]);
		p->scb->cmd = CUC_START;
		elmc_attn586();
		WAIT_4_SCB_CMD();
		netif_wake_queue(dev);
	} else {
#ifdef DEBUG
		printk("%s: xmitter timed out, try to restart! stat: %04x\n", dev->name, p->scb->status);
		printk("%s: command-stats: %04x %04x\n", dev->name, p->xmit_cmds[0]->cmd_status, p->xmit_cmds[1]->cmd_status);
#endif
		elmc_close(dev);
		elmc_open(dev);
	}
}
 
/******************************************************
 * send frame
 */

static int elmc_send_packet(struct sk_buff *skb, struct net_device *dev)
{
	int len;
	int i;
#ifndef NO_NOPCOMMANDS
	int next_nop;
#endif
	struct priv *p = (struct priv *) dev->priv;

	netif_stop_queue(dev);

	memcpy((char *) p->xmit_cbuffs[p->xmit_count], (char *) (skb->data), skb->len);
	len = (ETH_ZLEN < skb->len) ? skb->len : ETH_ZLEN;

#if (NUM_XMIT_BUFFS == 1)
#ifdef NO_NOPCOMMANDS
	p->xmit_buffs[0]->size = TBD_LAST | len;
	for (i = 0; i < 16; i++) {
		p->scb->cbl_offset = make16(p->xmit_cmds[0]);
		p->scb->cmd = CUC_START;
		p->xmit_cmds[0]->cmd_status = 0;
			elmc_attn586();
		dev->trans_start = jiffies;
		if (!i) {
			dev_kfree_skb(skb);
		}
		WAIT_4_SCB_CMD();
		if ((p->scb->status & CU_ACTIVE)) {	/* test it, because CU sometimes doesn't start immediately */
			break;
		}
		if (p->xmit_cmds[0]->cmd_status) {
			break;
		}
		if (i == 15) {
			printk(KERN_WARNING "%s: Can't start transmit-command.\n", dev->name);
		}
	}
#else
	next_nop = (p->nop_point + 1) & 0x1;
	p->xmit_buffs[0]->size = TBD_LAST | len;
	
	p->xmit_cmds[0]->cmd_link = p->nop_cmds[next_nop]->cmd_link
	    = make16((p->nop_cmds[next_nop]));
	p->xmit_cmds[0]->cmd_status = p->nop_cmds[next_nop]->cmd_status = 0;

	p->nop_cmds[p->nop_point]->cmd_link = make16((p->xmit_cmds[0]));
	dev->trans_start = jiffies;
	p->nop_point = next_nop;
	dev_kfree_skb(skb);
#endif
#else
	p->xmit_buffs[p->xmit_count]->size = TBD_LAST | len;
	if ((next_nop = p->xmit_count + 1) == NUM_XMIT_BUFFS) {
		next_nop = 0;
	}
	p->xmit_cmds[p->xmit_count]->cmd_status = 0;
	p->xmit_cmds[p->xmit_count]->cmd_link = p->nop_cmds[next_nop]->cmd_link
	    = make16((p->nop_cmds[next_nop]));
	p->nop_cmds[next_nop]->cmd_status = 0;
		p->nop_cmds[p->xmit_count]->cmd_link = make16((p->xmit_cmds[p->xmit_count]));
	dev->trans_start = jiffies;
	p->xmit_count = next_nop;
	if (p->xmit_count != p->xmit_last)
		netif_wake_queue(dev);
	dev_kfree_skb(skb);
#endif
	return 0;
}

/*******************************************
 * Someone wanna have the statistics
 */

static struct net_device_stats *elmc_get_stats(struct net_device *dev)
{
	struct priv *p = (struct priv *) dev->priv;
	unsigned short crc, aln, rsc, ovrn;

	crc = p->scb->crc_errs;	/* get error-statistic from the ni82586 */
	p->scb->crc_errs -= crc;
	aln = p->scb->aln_errs;
	p->scb->aln_errs -= aln;
	rsc = p->scb->rsc_errs;
	p->scb->rsc_errs -= rsc;
	ovrn = p->scb->ovrn_errs;
	p->scb->ovrn_errs -= ovrn;

	p->stats.rx_crc_errors += crc;
	p->stats.rx_fifo_errors += ovrn;
	p->stats.rx_frame_errors += aln;
	p->stats.rx_dropped += rsc;

	return &p->stats;
}

/********************************************************
 * Set MC list ..
 */

#ifdef ELMC_MULTICAST
static void set_multicast_list(struct net_device *dev)
{
	if (!dev->start) {
		/* without a running interface, promiscuous doesn't work */
		return;
	}
	dev->start = 0;
	alloc586(dev);
	init586(dev);
	startrecv586(dev);
	dev->start = 1;
}
#endif

/**
 * netdev_ethtool_ioctl: Handle network interface SIOCETHTOOL ioctls
 * @dev: network interface on which out-of-band action is to be performed
 * @useraddr: userspace address to which data is to be read and returned
 *
 * Process the various commands of the SIOCETHTOOL interface.
 */

static int netdev_ethtool_ioctl (struct net_device *dev, void *useraddr)
{
	u32 ethcmd;

	/* dev_ioctl() in ../../net/core/dev.c has already checked
	   capable(CAP_NET_ADMIN), so don't bother with that here.  */

	if (get_user(ethcmd, (u32 *)useraddr))
		return -EFAULT;

	switch (ethcmd) {

	case ETHTOOL_GDRVINFO: {
		struct ethtool_drvinfo info = { ETHTOOL_GDRVINFO };
		strcpy (info.driver, DRV_NAME);
		strcpy (info.version, DRV_VERSION);
		sprintf(info.bus_info, "MCA 0x%lx", dev->base_addr);
		if (copy_to_user (useraddr, &info, sizeof (info)))
			return -EFAULT;
		return 0;
	}

	default:
		break;
	}

	return -EOPNOTSUPP;
}

/**
 * netdev_ioctl: Handle network interface ioctls
 * @dev: network interface on which out-of-band action is to be performed
 * @rq: user request data
 * @cmd: command issued by user
 *
 * Process the various out-of-band ioctls passed to this driver.
 */

static int netdev_ioctl (struct net_device *dev, struct ifreq *rq, int cmd)
{
	int rc = 0;

	switch (cmd) {
	case SIOCETHTOOL:
		rc = netdev_ethtool_ioctl(dev, (void *) rq->ifr_data);
		break;

	default:
		rc = -EOPNOTSUPP;
		break;
	}

	return rc;
}
 
/*************************************************************************/

#ifdef MODULE

/* Increase if needed ;) */
#define MAX_3C523_CARDS 4

static struct net_device dev_elmc[MAX_3C523_CARDS];
static int irq[MAX_3C523_CARDS];
static int io[MAX_3C523_CARDS];
MODULE_PARM(irq, "1-" __MODULE_STRING(MAX_3C523_CARDS) "i");
MODULE_PARM(io, "1-" __MODULE_STRING(MAX_3C523_CARDS) "i");
MODULE_PARM_DESC(io, "EtherLink/MC I/O base address(es)");
MODULE_PARM_DESC(irq, "EtherLink/MC IRQ number(s)");

int init_module(void)
{
	int this_dev,found = 0;

	/* Loop until we either can't find any more cards, or we have MAX_3C523_CARDS */	
	for(this_dev=0; this_dev<MAX_3C523_CARDS; this_dev++) 
		{
		struct net_device *dev = &dev_elmc[this_dev];
		dev->irq=irq[this_dev];
		dev->base_addr=io[this_dev];
		dev->init=elmc_probe;
		if(register_netdev(dev)!=0) {
			if(io[this_dev]==0) break;
			printk(KERN_WARNING "3c523.c: No 3c523 card found at io=%#x\n",io[this_dev]);
		} else found++;
	}

	if(found==0) {
		if(io[0]==0) printk(KERN_NOTICE "3c523.c: No 3c523 cards found\n");
		return -ENXIO;
	} else return 0;
}

void cleanup_module(void)
{
	int this_dev;
	for(this_dev=0; this_dev<MAX_3C523_CARDS; this_dev++) {

		struct net_device *dev = &dev_elmc[this_dev];
		if(dev->priv) {
			/* shutdown interrupts on the card */
			elmc_id_reset586();
			if (dev->irq != 0) {
				/* this should be done by close, but if we failed to
				   initialize properly something may have gotten hosed. */
				free_irq(dev->irq, dev);
				dev->irq = 0;
			}
			if (dev->base_addr != 0) {
				release_region(dev->base_addr, ELMC_IO_EXTENT);
				dev->base_addr = 0;
			}
			irq[this_dev] = 0;
			io[this_dev] = 0;
			unregister_netdev(dev);

			mca_set_adapter_procfn(((struct priv *) (dev->priv))->slot,
			       NULL, NULL);

			kfree(dev->priv);
			dev->priv = NULL;
		}
	}
}

#endif				/* MODULE */