a2065.c

powerpc内核mpc8241linux系统下net驱动程序

}

static void lance_interrupt (int irq, void *dev_id, struct pt_regs *regs)
{
	struct device *dev;
	struct lance_private *lp;
	volatile struct lance_regs *ll;
	int csr0;

	dev = (struct device *) dev_id;

	lp = (struct lance_private *) dev->priv;
	ll = lp->ll;

	ll->rap = LE_CSR0;		/* LANCE Controller Status */
	csr0 = ll->rdp;

	if (!(csr0 & LE_C0_INTR))	/* Check if any interrupt has */
		return;			/* been generated by the Lance. */

	if (dev->interrupt)
		printk ("%s: again", dev->name);

	dev->interrupt = 1;

	/* Acknowledge all the interrupt sources ASAP */
	ll->rdp = csr0 & ~(LE_C0_INEA|LE_C0_TDMD|LE_C0_STOP|LE_C0_STRT|
			   LE_C0_INIT);

	if ((csr0 & LE_C0_ERR)) {
		/* Clear the error condition */
		ll->rdp = LE_C0_BABL|LE_C0_ERR|LE_C0_MISS|LE_C0_INEA;
	}
    
	if (csr0 & LE_C0_RINT)
		lance_rx (dev);

	if (csr0 & LE_C0_TINT)
		lance_tx (dev);

	/* Log misc errors. */
	if (csr0 & LE_C0_BABL)
		lp->stats.tx_errors++;       /* Tx babble. */
	if (csr0 & LE_C0_MISS)
		lp->stats.rx_errors++;       /* Missed a Rx frame. */
	if (csr0 & LE_C0_MERR) {
		printk("%s: Bus master arbitration failure, status %4.4x.\n", dev->name, csr0);
		/* Restart the chip. */
		ll->rdp = LE_C0_STRT;
	}

	if ((TX_BUFFS_AVAIL >= 0) && dev->tbusy) {
		dev->tbusy = 0;
		mark_bh (NET_BH);
	}
	ll->rap = LE_CSR0;
	ll->rdp = LE_C0_BABL|LE_C0_CERR|LE_C0_MISS|LE_C0_MERR|
					LE_C0_IDON|LE_C0_INEA;

	dev->interrupt = 0;
}

struct device *last_dev = 0;

static int lance_open (struct device *dev)
{
	struct lance_private *lp = (struct lance_private *)dev->priv;
	volatile struct lance_regs *ll = lp->ll;
	int status = 0;

	last_dev = dev;

	/* Install the Interrupt handler */
	if (request_irq(IRQ_AMIGA_PORTS, lance_interrupt, 0,
			"a2065 Ethernet", dev))
		return -EAGAIN;

	/* Stop the Lance */
	ll->rap = LE_CSR0;
	ll->rdp = LE_C0_STOP;

	load_csrs (lp);
	lance_init_ring (dev);

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

	status = init_restart_lance (lp);

	MOD_INC_USE_COUNT;

	return status;
}

static int lance_close (struct device *dev)
{
	struct lance_private *lp = (struct lance_private *) dev->priv;
	volatile struct lance_regs *ll = lp->ll;

	dev->start = 0;
	dev->tbusy = 1;
	del_timer(&lp->multicast_timer);

	/* Stop the card */
	ll->rap = LE_CSR0;
	ll->rdp = LE_C0_STOP;

	free_irq(IRQ_AMIGA_PORTS, dev);

	MOD_DEC_USE_COUNT;

	return 0;
}

static inline int lance_reset (struct device *dev)
{
	struct lance_private *lp = (struct lance_private *)dev->priv;
	volatile struct lance_regs *ll = lp->ll;
	int status;
    
	/* Stop the lance */
	ll->rap = LE_CSR0;
	ll->rdp = LE_C0_STOP;

	load_csrs (lp);
	lance_init_ring (dev);
	dev->trans_start = jiffies;
	dev->interrupt = 0;
	dev->start = 1;
	dev->tbusy = 0;
	status = init_restart_lance (lp);
#ifdef DEBUG_DRIVER
	printk ("Lance restart=%d\n", status);
#endif
	return status;
}

static int lance_start_xmit (struct sk_buff *skb, struct device *dev)
{
	struct lance_private *lp = (struct lance_private *)dev->priv;
	volatile struct lance_regs *ll = lp->ll;
	volatile struct lance_init_block *ib = lp->init_block;
	int entry, skblen, len;
	int status = 0;
	static int outs;
	unsigned long flags;

	/* Transmitter timeout, serious problems */
	if (dev->tbusy) {
		int tickssofar = jiffies - dev->trans_start;
	    
		if (tickssofar < 100) {
			status = -1;
		} else {
			printk ("%s: transmit timed out, status %04x, resetting\n",
				dev->name, ll->rdp);
			lance_reset (dev);
		}
		return status;
	}

	/* Block a timer-based transmit from overlapping. */
	if (test_and_set_bit (0, (void *) &dev->tbusy) != 0) {
		printk ("Transmitter access conflict.\n");
		return -1;
	}

	skblen = skb->len;

	save_flags(flags);
	cli();

	if (!TX_BUFFS_AVAIL){
		restore_flags(flags);
		return -1;
	}

#ifdef DEBUG_DRIVER
	/* dump the packet */
	{
		int i;
	
		for (i = 0; i < 64; i++) {
			if ((i % 16) == 0)
				printk ("\n");
			printk ("%2.2x ", skb->data [i]);
		}
	}
#endif
	len = (skblen <= ETH_ZLEN) ? ETH_ZLEN : skblen;
	entry = lp->tx_new & lp->tx_ring_mod_mask;
	ib->btx_ring [entry].length = (-len) | 0xf000;
	ib->btx_ring [entry].misc = 0;
    
	memcpy ((char *)&ib->tx_buf [entry][0], skb->data, skblen);

	/* Clear the slack of the packet, do I need this? */
	if (len != skblen)
		memset ((char *) &ib->tx_buf [entry][skblen], 0, len - skblen);
    
	/* Now, give the packet to the lance */
	ib->btx_ring [entry].tmd1_bits = (LE_T1_POK|LE_T1_OWN);
	lp->tx_new = (lp->tx_new+1) & lp->tx_ring_mod_mask;

	outs++;
	/* Kick the lance: transmit now */
	ll->rdp = LE_C0_INEA | LE_C0_TDMD;
	dev->trans_start = jiffies;
	dev_kfree_skb (skb);
    
	if (TX_BUFFS_AVAIL)
		dev->tbusy = 0;
	restore_flags(flags);

	return status;
}

static struct net_device_stats *lance_get_stats (struct device *dev)
{
	struct lance_private *lp = (struct lance_private *) dev->priv;

	return &lp->stats;
}

/* taken from the depca driver */
static void lance_load_multicast (struct device *dev)
{
	struct lance_private *lp = (struct lance_private *) dev->priv;
	volatile struct lance_init_block *ib = lp->init_block;
	volatile u16 *mcast_table = (u16 *)&ib->filter;
	struct dev_mc_list *dmi=dev->mc_list;
	char *addrs;
	int i, j, bit, byte;
	u32 crc, poly = CRC_POLYNOMIAL_LE;
	
	/* set all multicast bits */
	if (dev->flags & IFF_ALLMULTI){ 
		ib->filter [0] = 0xffffffff;
		ib->filter [1] = 0xffffffff;
		return;
	}
	/* clear the multicast filter */
	ib->filter [0] = 0;
	ib->filter [1] = 0;

	/* Add addresses */
	for (i = 0; i < dev->mc_count; i++){
		addrs = dmi->dmi_addr;
		dmi   = dmi->next;

		/* multicast address? */
		if (!(*addrs & 1))
			continue;
		
		crc = 0xffffffff;
		for (byte = 0; byte < 6; byte++)
			for (bit = *addrs++, j = 0; j < 8; j++, bit>>=1)
			{
				int test;

				test = ((bit ^ crc) & 0x01);
				crc >>= 1;

				if (test)
				{
					crc = crc ^ poly;
				}
			}
		
		crc = crc >> 26;
		mcast_table [crc >> 4] |= 1 << (crc & 0xf);
	}
	return;
}

static void lance_set_multicast (struct device *dev)
{
	struct lance_private *lp = (struct lance_private *) dev->priv;
	volatile struct lance_init_block *ib = lp->init_block;
	volatile struct lance_regs *ll = lp->ll;

	if (!dev->start)
		return;

	if (dev->tbusy) {
		mod_timer(&lp->multicast_timer, jiffies + 2);
		return;
	}
	set_bit (0, (void *) &dev->tbusy);

	if (lp->tx_old != lp->tx_new) {
		mod_timer(&lp->multicast_timer, jiffies + 4);
		dev->tbusy = 0;
		return;
	}

	ll->rap = LE_CSR0;
	ll->rdp = LE_C0_STOP;
	lance_init_ring (dev);

	if (dev->flags & IFF_PROMISC) {
		ib->mode |= LE_MO_PROM;
	} else {
		ib->mode &= ~LE_MO_PROM;
		lance_load_multicast (dev);
	}
	load_csrs (lp);
	init_restart_lance (lp);
	dev->tbusy = 0;
	mark_bh(NET_BH);
}


__initfunc(int a2065_probe(struct device *dev))
{
	unsigned int key, is_cbm;
	const struct ConfigDev *cd;
	u_long board;
	u_long sn;
	struct lance_private *priv;
	struct A2065Board *a2065;

	if ((key = is_cbm = zorro_find(ZORRO_PROD_CBM_A2065_1, 0, 0)) ||
	    (key = is_cbm = zorro_find(ZORRO_PROD_CBM_A2065_2, 0, 0)) ||
	    (key = zorro_find(ZORRO_PROD_AMERISTAR_A2065, 0, 0))) {
		cd = zorro_get_board(key);
		if ((board = (u_long)cd->cd_BoardAddr)) {
			sn = cd->cd_Rom.er_SerialNumber;
			if (is_cbm) {			/* Commodore */
				dev->dev_addr[0] = 0x00;
				dev->dev_addr[1] = 0x80;
				dev->dev_addr[2] = 0x10;
			} else {			/* Ameristar */
				dev->dev_addr[0] = 0x00;
				dev->dev_addr[1] = 0x00;
				dev->dev_addr[2] = 0x9f;
			}
			dev->dev_addr[3] = (sn>>16) & 0xff;
			dev->dev_addr[4] = (sn>>8) & 0xff;
			dev->dev_addr[5] = sn & 0xff;
			printk("%s: A2065 at 0x%08lx, Ethernet Address %02x:%02x:%02x:%02x:%02x:%02x\n",
			       dev->name, board, dev->dev_addr[0],
			       dev->dev_addr[1], dev->dev_addr[2],
			       dev->dev_addr[3], dev->dev_addr[4],
			       dev->dev_addr[5]);

			init_etherdev(dev, 0);

			dev->priv = kmalloc(sizeof(struct
						   lance_private),
					    GFP_KERNEL);
			if (dev->priv == NULL)  
				return -ENOMEM;
			priv = (struct lance_private *)dev->priv;
			memset(priv, 0, sizeof(struct lance_private));

			a2065 = (struct A2065Board *)ZTWO_VADDR(board);
			priv->ll = &a2065->Lance;
			priv->init_block =
					(struct lance_init_block *)&a2065->RAM;
			priv->lance_init_block = (struct lance_init_block *)
					      offsetof(struct A2065Board, RAM);
			priv->auto_select = 0;
			priv->key = key;
			priv->busmaster_regval = LE_C3_BSWP;

			priv->lance_log_rx_bufs = LANCE_LOG_RX_BUFFERS;
			priv->lance_log_tx_bufs = LANCE_LOG_TX_BUFFERS;
			priv->rx_ring_mod_mask = RX_RING_MOD_MASK;
			priv->tx_ring_mod_mask = TX_RING_MOD_MASK;

			dev->open = &lance_open;
			dev->stop = &lance_close;
			dev->hard_start_xmit = &lance_start_xmit;
			dev->get_stats = &lance_get_stats;
			dev->set_multicast_list = &lance_set_multicast;
			dev->dma = 0;

			ether_setup(dev);
			init_timer(&priv->multicast_timer);
			priv->multicast_timer.data = (unsigned long) dev;
			priv->multicast_timer.function =
				(void (*)(unsigned long)) &lance_set_multicast;

			zorro_config_board(key, 0);
			return(0);
		}
	}
	return(-ENODEV);
}


#ifdef MODULE
static char devicename[9] = { 0, };

static struct device a2065_dev =
{
	devicename,			/* filled in by register_netdev() */
	0, 0, 0, 0,			/* memory */
	0, 0,				/* base, irq */
	0, 0, 0, NULL, a2065_probe,
};

int init_module(void)
{
	int err;

	if ((err = register_netdev(&a2065_dev))) {
		if (err == -EIO)
			printk("No A2065 board found. Module not loaded.\n");
		return(err);
	}
	return(0);
}

void cleanup_module(void)
{
	struct lance_private *priv = (struct lance_private *)a2065_dev.priv;

	unregister_netdev(&a2065_dev);
	zorro_unconfig_board(priv->key, 0);
	kfree(priv);
}

#endif /* MODULE */