cs89x0.c

powerpc内核mpc8241linux系统下net驱动程序

		   There should really be a "kick me" function call instead. */
		int tickssofar = jiffies - dev->trans_start;
		if (tickssofar < 5)
			return 1;
		if (net_debug > 0) printk("%s: transmit timed out, %s?\n", dev->name,
			   tx_done(dev) ? "IRQ conflict" : "network cable problem");
		/* Try to restart the adaptor. */
		dev->tbusy=0;
		dev->trans_start = jiffies;
	}

	/* Block a timer-based transmit from overlapping.  This could better be
	   done with atomic_swap(1, dev->tbusy), but set_bit() works as well. */
	if (test_and_set_bit(0, (void*)&dev->tbusy) != 0)
		printk("%s: Transmitter access conflict.\n", dev->name);
	else {
		struct net_local *lp = (struct net_local *)dev->priv;
		short ioaddr = dev->base_addr;
		unsigned long flags;

		if (net_debug > 3)printk("%s: sent %d byte packet of type %x\n", dev->name, skb->len, (skb->data[ETH_ALEN+ETH_ALEN] << 8) | skb->data[ETH_ALEN+ETH_ALEN+1]);

		/* keep the upload from being interrupted, since we
                   ask the chip to start transmitting before the
                   whole packet has been completely uploaded. */
		save_flags(flags);
		cli();

		/* initiate a transmit sequence */
		outw(lp->send_cmd, ioaddr + TX_CMD_PORT);
		outw(skb->len, ioaddr + TX_LEN_PORT);

		/* Test to see if the chip has allocated memory for the packet */
		if ((readreg(dev, PP_BusST) & READY_FOR_TX_NOW) == 0) {
			/* Gasp!  It hasn't.  But that shouldn't happen since
			   we're waiting for TxOk, so return 1 and requeue this packet. */
			restore_flags(flags);
			return 1;
		}

		/* Write the contents of the packet */
                outsw(ioaddr + TX_FRAME_PORT,skb->data,(skb->len+1) >>1);

		restore_flags(flags);
		dev->trans_start = jiffies;
	}
	dev_kfree_skb (skb);

	return 0;
}

/* The typical workload of the driver:
   Handle the network interface interrupts. */
static void net_interrupt(int irq, void *dev_id, struct pt_regs * regs)
{
	struct device *dev = dev_id;
	struct net_local *lp;
	int ioaddr, status;

	if (dev == NULL) {
		printk ("net_interrupt(): irq %d for unknown device.\n", irq);
		return;
	}
	if (dev->interrupt)
		printk("%s: Re-entering the interrupt handler.\n", dev->name);
	dev->interrupt = 1;

	ioaddr = dev->base_addr;
	lp = (struct net_local *)dev->priv;

	/* we MUST read all the events out of the ISQ, otherwise we'll never
           get interrupted again.  As a consequence, we can't have any limit
           on the number of times we loop in the interrupt handler.  The
           hardware guarantees that eventually we'll run out of events.  Of
           course, if you're on a slow machine, and packets are arriving
           faster than you can read them off, you're screwed.  Hasta la
           vista, baby!  */
	while ((status = readword(dev, ISQ_PORT))) {
		if (net_debug > 4)printk("%s: event=%04x\n", dev->name, status);
		switch(status & ISQ_EVENT_MASK) {
		case ISQ_RECEIVER_EVENT:
			/* Got a packet(s). */
			net_rx(dev);
			break;
		case ISQ_TRANSMITTER_EVENT:
			lp->stats.tx_packets++;
			dev->tbusy = 0;
			mark_bh(NET_BH);	/* Inform upper layers. */
			if ((status & TX_OK) == 0) lp->stats.tx_errors++;
			if (status & TX_LOST_CRS) lp->stats.tx_carrier_errors++;
			if (status & TX_SQE_ERROR) lp->stats.tx_heartbeat_errors++;
			if (status & TX_LATE_COL) lp->stats.tx_window_errors++;
			if (status & TX_16_COL) lp->stats.tx_aborted_errors++;
			break;
		case ISQ_BUFFER_EVENT:
			if (status & READY_FOR_TX) {
				/* we tried to transmit a packet earlier,
                                   but inexplicably ran out of buffers.
                                   That shouldn't happen since we only ever
                                   load one packet.  Shrug.  Do the right
                                   thing anyway. */
				dev->tbusy = 0;
				mark_bh(NET_BH);	/* Inform upper layers. */
			}
			if (status & TX_UNDERRUN) {
				if (net_debug > 0) printk("%s: transmit underrun\n", dev->name);
                                lp->send_underrun++;
                                if (lp->send_underrun == 3) lp->send_cmd = TX_AFTER_381;
                                else if (lp->send_underrun == 6) lp->send_cmd = TX_AFTER_ALL;
                        }
			break;
		case ISQ_RX_MISS_EVENT:
			lp->stats.rx_missed_errors += (status >>6);
			break;
		case ISQ_TX_COL_EVENT:
			lp->stats.collisions += (status >>6);
			break;
		}
	}
	dev->interrupt = 0;
	return;
}

/* We have a good packet(s), get it/them out of the buffers. */
static void
net_rx(struct device *dev)
{
	struct net_local *lp = (struct net_local *)dev->priv;
	int ioaddr = dev->base_addr;
	struct sk_buff *skb;
	int status, length;

	status = inw(ioaddr + RX_FRAME_PORT);
	length = inw(ioaddr + RX_FRAME_PORT);
	if ((status & RX_OK) == 0) {
		lp->stats.rx_errors++;
		if (status & RX_RUNT) lp->stats.rx_length_errors++;
		if (status & RX_EXTRA_DATA) lp->stats.rx_length_errors++;
		if (status & RX_CRC_ERROR) if (!(status & (RX_EXTRA_DATA|RX_RUNT)))
			/* per str 172 */
			lp->stats.rx_crc_errors++;
		if (status & RX_DRIBBLE) lp->stats.rx_frame_errors++;
		return;
	}

	/* Malloc up new buffer. */
	skb = alloc_skb(length, GFP_ATOMIC);
	if (skb == NULL) {
		printk("%s: Memory squeeze, dropping packet.\n", dev->name);
		lp->stats.rx_dropped++;
		return;
	}
	skb->len = length;
	skb->dev = dev;

        insw(ioaddr + RX_FRAME_PORT, skb->data, length >> 1);
	if (length & 1)
		skb->data[length-1] = inw(ioaddr + RX_FRAME_PORT);

	if (net_debug > 3)printk("%s: received %d byte packet of type %x\n",
                                 dev->name, length,
                                 (skb->data[ETH_ALEN+ETH_ALEN] << 8) | skb->data[ETH_ALEN+ETH_ALEN+1]);

        skb->protocol=eth_type_trans(skb,dev);
	netif_rx(skb);
	lp->stats.rx_packets++;
	lp->stats.rx_bytes+=skb->len;
	return;
}

/* The inverse routine to net_open(). */
static int
net_close(struct device *dev)
{

	writereg(dev, PP_RxCFG, 0);
	writereg(dev, PP_TxCFG, 0);
	writereg(dev, PP_BufCFG, 0);
	writereg(dev, PP_BusCTL, 0);

	dev->start = 0;

	free_irq(dev->irq, dev);

	/* Update the statistics here. */

        MOD_DEC_USE_COUNT;
	return 0;

}

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

	cli();
	/* Update the statistics from the device registers. */
	lp->stats.rx_missed_errors += (readreg(dev, PP_RxMiss) >> 6);
	lp->stats.collisions += (readreg(dev, PP_TxCol) >> 6);
	sti();

	return &lp->stats;
}

static void set_multicast_list(struct device *dev)
{
	struct net_local *lp = (struct net_local *)dev->priv;

	if(dev->flags&IFF_PROMISC)
	{
		lp->rx_mode = RX_ALL_ACCEPT;
	}
	else if((dev->flags&IFF_ALLMULTI)||dev->mc_list)
	{
		/* The multicast-accept list is initialized to accept-all, and we
		   rely on higher-level filtering for now. */
		lp->rx_mode = RX_MULTCAST_ACCEPT;
	} 
	else
		lp->rx_mode = 0;

	writereg(dev, PP_RxCTL, DEF_RX_ACCEPT | lp->rx_mode);

	/* in promiscuous mode, we accept errored packets, so we have to enable interrupts on them also */
	writereg(dev, PP_RxCFG, lp->curr_rx_cfg |
	     (lp->rx_mode == RX_ALL_ACCEPT? (RX_CRC_ERROR_ENBL|RX_RUNT_ENBL|RX_EXTRA_DATA_ENBL) : 0));
}


static int set_mac_address(struct device *dev, void *addr)
{
	int i;
	if (dev->start)
		return -EBUSY;
	printk("%s: Setting MAC address to ", dev->name);
	for (i = 0; i < 6; i++)
		printk(" %2.2x", dev->dev_addr[i] = ((unsigned char *)addr)[i]);
	printk(".\n");
	/* set the Ethernet address */
	for (i=0; i < ETH_ALEN/2; i++)
		writereg(dev, PP_IA+i*2, dev->dev_addr[i*2] | (dev->dev_addr[i*2+1] << 8));

	return 0;
}

#ifdef MODULE

static char namespace[16] = "";
static struct device dev_cs89x0 = {
        NULL,
        0, 0, 0, 0,
        0, 0,
        0, 0, 0, NULL, NULL };

static int io=0;
static int irq=0;
static int debug=0;
static char media[8];
static int duplex=-1;

MODULE_PARM(io, "i");
MODULE_PARM(irq, "i");
MODULE_PARM(debug, "i");
MODULE_PARM(media, "s");
MODULE_PARM(duplex, "i");

EXPORT_NO_SYMBOLS;

/*
* media=t             - specify media type
   or media=2
   or media=aui
   or medai=auto
* duplex=0            - specify forced half/full/autonegotiate duplex
* debug=#             - debug level


* Default Chip Configuration:
  * DMA Burst = enabled
  * IOCHRDY Enabled = enabled
    * UseSA = enabled
    * CS8900 defaults to half-duplex if not specified on command-line
    * CS8920 defaults to autoneg if not specified on command-line
    * Use reset defaults for other config parameters

* Assumptions:
  * media type specified is supported (circuitry is present)
  * if memory address is > 1MB, then required mem decode hw is present
  * if 10B-2, then agent other than driver will enable DC/DC converter
    (hw or software util)


*/

int
init_module(void)
{
	struct net_local *lp;

	net_debug = debug;
        dev_cs89x0.name = namespace;
	dev_cs89x0.irq = irq;
	dev_cs89x0.base_addr = io;
        dev_cs89x0.init = cs89x0_probe;
        dev_cs89x0.priv = kmalloc(sizeof(struct net_local), GFP_KERNEL);
	memset(dev_cs89x0.priv, 0, sizeof(struct net_local));
	lp = (struct net_local *)dev_cs89x0.priv;

        /* boy, they'd better get these right */
        if (!strcmp(media, "rj45"))
		lp->adapter_cnf = A_CNF_MEDIA_10B_T | A_CNF_10B_T;
	else if (!strcmp(media, "aui"))
		lp->adapter_cnf = A_CNF_MEDIA_AUI   | A_CNF_AUI;
	else if (!strcmp(media, "bnc"))
		lp->adapter_cnf = A_CNF_MEDIA_10B_2 | A_CNF_10B_2;
	else
		lp->adapter_cnf = A_CNF_MEDIA_10B_T | A_CNF_10B_T;

        if (duplex==-1)
		lp->auto_neg_cnf = AUTO_NEG_ENABLE;

        if (io == 0)  {
                printk(KERN_NOTICE "cs89x0.c: Module autoprobing not allowed.\n");
                printk(KERN_NOTICE "cs89x0.c: Append io=0xNNN\n");
                return -EPERM;
        }
        if (register_netdev(&dev_cs89x0) != 0) {
                printk(KERN_WARNING "cs89x0.c: No card found at 0x%x\n", io);
                return -ENXIO;
        }
	return 0;
}

void
cleanup_module(void)
{

#endif
#ifdef MODULE
	outw(0, dev_cs89x0.base_addr + ADD_PORT);
#endif
#ifdef MODULE

        if (dev_cs89x0.priv != NULL) {
                /* Free up the private structure, or leak memory :-)  */
                unregister_netdev(&dev_cs89x0);
                kfree(dev_cs89x0.priv);
                dev_cs89x0.priv = NULL;	/* gets re-allocated by cs89x0_probe1 */
                /* If we don't do this, we can't re-insmod it later. */
                release_region(dev_cs89x0.base_addr, NETCARD_IO_EXTENT);
        }
}
#endif /* MODULE */

/*
 * Local variables:
 *  compile-command: "gcc -D__KERNEL__ -I/usr/src/linux/include -I/usr/src/linux/net/inet -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -DMODULE -DCONFIG_MODVERSIONS -c cs89x0.c"
 *  version-control: t
 *  kept-new-versions: 5
 *  c-indent-level: 8
 *  tab-width: 8
 * End:
 *
 */