sunlance.c

powerpc内核mpc8241linux系统下net驱动程序

	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? */
	/* For a firewall its a good idea - AC */
	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) & TX_RING_MOD_MASK;

	/* 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;

	/* Read back CSR to invalidate the E-Cache.
	 * This is needed, because DMA_DSBL_WR_INV is set. */
	if (lp->ledma)
		flush = ll->rdp;

	restore_flags(flags);
	return 0;
}

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);
	}
}

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;
	}
	/* This CANNOT be correct. Chip is running
	   and dev->tbusy may change any moment.
	   It is useless to set it.

	   Generally, usage of dev->tbusy in this driver is completely
	   wrong.

	   I protected calls to this function
	   with start_bh_atomic, so that set_multicast_list
	   and hard_start_xmit are serialized now by top level. --ANK

	   The same is true about a2065.
	 */
	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(static int 
sparc_lance_init (struct device *dev, struct linux_sbus_device *sdev,
		  struct Linux_SBus_DMA *ledma,
		  struct linux_sbus_device *lebuffer))
{
	static unsigned version_printed = 0;
	int    i;
	struct lance_private *lp;
	volatile struct lance_regs *ll;

	if (dev == NULL) {
		dev = init_etherdev (0, sizeof (struct lance_private) + 8);
	} else {
		dev->priv = kmalloc (sizeof (struct lance_private) + 8,
				     GFP_KERNEL);
		if (dev->priv == NULL)
			return -ENOMEM;
		memset(dev->priv, 0, sizeof (struct lance_private) + 8);
	}
	if (sparc_lance_debug && version_printed++ == 0)
		printk (version);

	printk ("%s: LANCE ", dev->name);
	/* Fill the dev fields */
	dev->base_addr = (long) sdev;

	/* Copy the IDPROM ethernet address to the device structure, later we
	 * will copy the address in the device structure to the lance
	 * initialization block.
	 */
	for (i = 0; i < 6; i++)
		printk ("%2.2x%c", dev->dev_addr[i] = idprom->id_ethaddr[i],
			i == 5 ? ' ': ':');
	printk("\n");

	/* Get the IO region */
	prom_apply_sbus_ranges (sdev->my_bus, &sdev->reg_addrs [0],
				sdev->num_registers, sdev);
	ll = sparc_alloc_io (sdev->reg_addrs [0].phys_addr, 0,
			     sizeof (struct lance_regs), lancestr,
			     sdev->reg_addrs[0].which_io, 0x0);

	/* Make certain the data structures used by the LANCE are aligned. */
	dev->priv = (void *)(((unsigned long)dev->priv + 7) & ~7);
	lp = (struct lance_private *) dev->priv;
	lp->sbus = sdev->my_bus;
	if (lebuffer){
		prom_apply_sbus_ranges (lebuffer->my_bus,
					&lebuffer->reg_addrs [0],
					lebuffer->num_registers,
					lebuffer);

		lp->init_block = (void *)
			sparc_alloc_io (lebuffer->reg_addrs [0].phys_addr, 0,
				sizeof (struct lance_init_block), "lebuffer", 
				lebuffer->reg_addrs [0].which_io, 0);
		lp->init_block_dvma = 0;

		lp->pio_buffer = 1;
	} else {
		lp->init_block = (void *)
			sparc_dvma_malloc (sizeof (struct lance_init_block),
					   lancedma, &lp->init_block_dvma);
		lp->pio_buffer = 0;
	}
	lp->busmaster_regval = prom_getintdefault(sdev->prom_node,
						  "busmaster-regval",
						  (LE_C3_BSWP | LE_C3_ACON |
						   LE_C3_BCON));

	lp->ll = ll;
	lp->name = lancestr;
	lp->ledma = ledma;

	lp->burst_sizes = 0;
	if (lp->ledma) {
		char prop[6];
		unsigned int sbmask;

		/* Find burst-size property for ledma */
		lp->burst_sizes = prom_getintdefault(ledma->SBus_dev->prom_node,
						     "burst-sizes", 0);

		/* ledma may be capable of fast bursts, but sbus may not. */
		sbmask = prom_getintdefault(ledma->SBus_dev->my_bus->prom_node,
					    "burst-sizes", DMA_BURSTBITS);
		lp->burst_sizes &= sbmask;

		/* Get the cable-selection property */
		memset(prop, 0, sizeof(prop));
		prom_getstring(ledma->SBus_dev->prom_node, "cable-selection",
			       prop, sizeof(prop));
		if (prop[0] == 0) {
			int topnd, nd;

			printk("%s: using auto-carrier-detection.\n",
			       dev->name);

			/* Is this found at /options .attributes in all
			 * Prom versions? XXX
			 */
			topnd = prom_getchild(prom_root_node);

			nd = prom_searchsiblings(topnd, "options");
			if (!nd)
				goto no_link_test;

			if (!prom_node_has_property(nd, "tpe-link-test?"))
				goto no_link_test;

			memset(prop, 0, sizeof(prop));
			prom_getstring(nd, "tpe-link-test?", prop,
				       sizeof(prop));

			if (strcmp(prop, "true")) {
				printk("%s: warning: overriding option "
				       "'tpe-link-test?'\n", dev->name);
				printk("%s: warning: mail any problems "
				       "to [e-mail]\n", dev->name);
				set_auxio(AUXIO_LINK_TEST, 0);
			}
no_link_test:
			lp->auto_select = 1;
			lp->tpe = 0;
		} else if (!strcmp(prop, "aui")) {
			lp->auto_select = 0;
			lp->tpe = 0;
		} else {
			lp->auto_select = 0;
			lp->tpe = 1;
		}

		/* Reset ledma */
		lp->ledma->regs->cond_reg |= DMA_RST_ENET;
		udelay (200);
		lp->ledma->regs->cond_reg &= ~DMA_RST_ENET;
	}

	/* This should never happen. */
	if ((unsigned long)(lp->init_block->brx_ring) & 0x07) {
		printk("%s: ERROR: Rx and Tx rings not on even boundary.\n",
		       dev->name);
		return ENODEV;
	}

	lp->dev = dev;
	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->irq = sdev->irqs[0];

	dev->dma = 0;
	ether_setup (dev);

	/* We cannot sleep if the chip is busy during a
	 * multicast list update event, because such events
	 * can occur from interrupts (ex. IPv6).  So we
	 * use a timer to try again later when necessary. -DaveM
	 */
	init_timer(&lp->multicast_timer);
	lp->multicast_timer.data = (unsigned long) dev;
	lp->multicast_timer.function =
		(void (*)(unsigned long)) &lance_set_multicast;

#ifdef MODULE
	dev->ifindex = dev_new_index();
	lp->next_module = root_lance_dev;
	root_lance_dev = lp;
#endif
	return 0;
}

/* On 4m, find the associated dma for the lance chip */
static inline struct Linux_SBus_DMA *
find_ledma (struct linux_sbus_device *dev)
{
	struct Linux_SBus_DMA *p;

	for_each_dvma(p)
		if (p->SBus_dev == dev)
			return p;
	return 0;
}

#ifdef CONFIG_SUN4

#include <asm/sun4paddr.h>

/* Find all the lance cards on the system and initialize them */
__initfunc(int sparc_lance_probe (struct device *dev))
{
	static struct linux_sbus_device sdev;
	static int called = 0;

	if(called)
		return ENODEV;
	called++;

	if ((idprom->id_machtype == (SM_SUN4|SM_4_330)) ||
	    (idprom->id_machtype == (SM_SUN4|SM_4_470))) {
		memset (&sdev, 0, sizeof(sdev));
		sdev.reg_addrs[0].phys_addr = sun4_eth_physaddr;
		sdev.irqs[0] = 6;
		return sparc_lance_init(dev, &sdev, 0, 0);
	}
	return ENODEV;
}

#else /* !CONFIG_SUN4 */

/* Find all the lance cards on the system and initialize them */
__initfunc(int sparc_lance_probe (struct device *dev))
{
	struct linux_sbus *bus;
	struct linux_sbus_device *sdev = 0;
	struct Linux_SBus_DMA *ledma = 0;
	static int called = 0;
	int cards = 0, v;

	if(called)
		return ENODEV;
	called++;

	for_each_sbus (bus) {
		for_each_sbusdev (sdev, bus) {
			if (cards) dev = NULL;
			if (strcmp (sdev->prom_name, "le") == 0) {
				cards++;
				if ((v = sparc_lance_init(dev, sdev, 0, 0)))
					return v;
				continue;
			}
			if (strcmp (sdev->prom_name, "ledma") == 0) {
				cards++;
				ledma = find_ledma (sdev);
				if ((v = sparc_lance_init(dev, sdev->child,
							  ledma, 0)))
					return v;
				continue;
			}
			if (strcmp (sdev->prom_name, "lebuffer") == 0){
				cards++;
				if ((v = sparc_lance_init(dev, sdev->child,
							  0, sdev)))
					return v;
				continue;
			}
		} /* for each sbusdev */
	} /* for each sbus */
	if (!cards)
		return ENODEV;
	return 0;
}
#endif /* !CONFIG_SUN4 */

#ifdef MODULE

int
init_module(void)
{
	root_lance_dev = NULL;
	return sparc_lance_probe(NULL);
}

void
cleanup_module(void)
{
	struct lance_private *lp;

	while (root_lance_dev) {
		lp = root_lance_dev->next_module;

		unregister_netdev(root_lance_dev->dev);
		kfree(root_lance_dev->dev);
		root_lance_dev = lp;
	}
}

#endif /* MODULE */