sunbmac.c

powerpc内核mpc8241linux系统下net驱动程序

	}
	return res;
}

static int bigmac_close(struct device *dev)
{
	struct bigmac *bp = (struct bigmac *) dev->priv;

	del_timer(&bp->bigmac_timer);
	bp->timer_state = asleep;
	bp->timer_ticks = 0;

	bigmac_stop(bp);
	bigmac_clean_rings(bp);
	free_irq(dev->irq, (void *)bp);
	MOD_DEC_USE_COUNT;
	return 0;
}

/* Put a packet on the wire. */
static int bigmac_start_xmit(struct sk_buff *skb, struct device *dev)
{
	struct bigmac *bp = (struct bigmac *) dev->priv;
	int len, entry;

	if(dev->tbusy) {
		int tickssofar = jiffies - dev->trans_start;
	    
		if (tickssofar < 40) {
			return 1;
		} else {
			printk ("%s: transmit timed out, resetting\n", dev->name);
			bp->enet_stats.tx_errors++;
			bigmac_init(bp, 0);
			dev->tbusy = 0;
			dev->trans_start = jiffies;
			dev_kfree_skb(skb);
			return 0;
		}
	}

	if(test_and_set_bit(0, (void *) &dev->tbusy) != 0) {
		printk("%s: Transmitter access conflict.\n", dev->name);
		return 1;
	}

	if(!TX_BUFFS_AVAIL(bp))
		return 1;

#ifdef NEED_DMA_SYNCHRONIZATION
#ifdef __sparc_v9__
	if ((unsigned long) (skb->data + skb->len) >= MAX_DMA_ADDRESS) {
		struct sk_buff *new_skb = skb_copy(skb, GFP_DMA | GFP_ATOMIC);
		if(!new_skb)
			return 1;
		dev_kfree_skb(skb);
		skb = new_skb;
	}
#endif
	mmu_sync_dma(sbus_dvma_addr(skb->data),
		     skb->len, bp->bigmac_sbus_dev->my_bus);
#endif
	len = skb->len;
	entry = bp->tx_new;
	DTX(("bigmac_start_xmit: len(%d) entry(%d)\n", len, entry));

	/* Avoid a race... */
	bp->bmac_block->be_txd[entry].tx_flags = TXD_UPDATE;

	bp->tx_skbs[entry] = skb;
	bp->bmac_block->be_txd[entry].tx_addr = sbus_dvma_addr(skb->data);
	bp->bmac_block->be_txd[entry].tx_flags =
		(TXD_OWN | TXD_SOP | TXD_EOP | (len & TXD_LENGTH));
	dev->trans_start = jiffies;
	bp->tx_new = NEXT_TX(entry);

	/* Get it going. */
	bp->creg->ctrl = CREG_CTRL_TWAKEUP;

	if(TX_BUFFS_AVAIL(bp))
		dev->tbusy = 0;

	return 0;
}

#ifndef __sparc_v9__
static int sun4c_bigmac_start_xmit(struct sk_buff *skb, struct device *dev)
{
	struct bigmac *bp = (struct bigmac *) dev->priv;
	struct bigmac_buffers *bbufs = bp->sun4c_buffers;
	__u32 txbuf_dvma, bbufs_dvma = bp->s4c_buf_dvma;
	unsigned char *txbuf;
	int len, entry;

	if(dev->tbusy) {
		int tickssofar = jiffies - dev->trans_start;
	    
		if (tickssofar < 40) {
			return 1;
		} else {
			printk ("%s: transmit timed out, resetting\n", dev->name);
			bp->enet_stats.tx_errors++;
			bigmac_init(bp, 0);
			dev->tbusy = 0;
			dev->trans_start = jiffies;
			return 0;
		}
	}

	if(test_and_set_bit(0, (void *) &dev->tbusy) != 0) {
		printk("%s: Transmitter access conflict.\n", dev->name);
		return 1;
	}

	if(!SUN4C_TX_BUFFS_AVAIL(bp))
		return 1;

	len = skb->len;
	entry = bp->tx_new;

	txbuf = &bbufs->tx_buf[entry][0];
	txbuf_dvma = bbufs_dvma + bbuf_offset(tx_buf, entry);
	memcpy(txbuf, skb->data, len);

	/* Avoid a race... */
	bp->bmac_block->be_txd[entry].tx_flags = TXD_UPDATE;

	bp->bmac_block->be_txd[entry].tx_addr = txbuf_dvma;
	bp->bmac_block->be_txd[entry].tx_flags =
		(TXD_OWN | TXD_SOP | TXD_EOP | (len & TXD_LENGTH));
	bp->tx_new = NEXT_TX(entry);

	/* Get it going. */
	dev->trans_start = jiffies;
	bp->creg->ctrl = CREG_CTRL_TWAKEUP;

	dev_kfree_skb(skb);

	if(SUN4C_TX_BUFFS_AVAIL(bp))
		dev->tbusy = 0;

	return 0;
}
#endif

static struct enet_statistics *bigmac_get_stats(struct device *dev)
{
	struct bigmac *bp = (struct bigmac *) dev->priv;

	bigmac_get_counters(bp, bp->bregs);
	return &bp->enet_stats;
}

#define CRC_POLYNOMIAL_BE 0x04c11db7UL  /* Ethernet CRC, big endian */
#define CRC_POLYNOMIAL_LE 0xedb88320UL  /* Ethernet CRC, little endian */

static void bigmac_set_multicast(struct device *dev)
{
	struct bigmac *bp = (struct bigmac *) dev->priv;
	struct BIG_MAC_regs *bregs = bp->bregs;
	struct dev_mc_list *dmi = dev->mc_list;
	char *addrs;
	int i, j, bit, byte;
	u32 crc, poly = CRC_POLYNOMIAL_LE;

	/* Disable the receiver.  The bit self-clears when
	 * the operation is complete.
	 */
	bregs->rx_cfg &= ~(BIGMAC_RXCFG_ENABLE);
	while((bregs->rx_cfg & BIGMAC_RXCFG_ENABLE) != 0)
		udelay(20);

	if((dev->flags & IFF_ALLMULTI) || (dev->mc_count > 64)) {
		bregs->htable0 = 0xffff;
		bregs->htable1 = 0xffff;
		bregs->htable2 = 0xffff;
		bregs->htable3 = 0xffff;
	} else if(dev->flags & IFF_PROMISC) {
		bregs->rx_cfg |= BIGMAC_RXCFG_PMISC;
	} else {
		u16 hash_table[4];

		for(i = 0; i < 4; i++)
			hash_table[i] = 0;

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

			if(!(*addrs & 1))
				continue;

			crc = 0xffffffffU;
			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 >>= 26;
			hash_table[crc >> 4] |= 1 << (crc & 0xf);
		}
		bregs->htable0 = hash_table[0];
		bregs->htable1 = hash_table[1];
		bregs->htable2 = hash_table[2];
		bregs->htable3 = hash_table[3];
	}

	/* Re-enable the receiver. */
	bregs->rx_cfg |= BIGMAC_RXCFG_ENABLE;
}

__initfunc(static int bigmac_ether_init(struct device *dev, struct linux_sbus_device *qec_sdev))
{
	static unsigned version_printed = 0;
	struct bigmac *bp = 0;
	unsigned char bsizes, bsizes_more;
	int i, j, num_qranges, res = ENOMEM;
	struct linux_prom_ranges qranges[8];

	/* Get a new device struct for this interface. */
	dev = init_etherdev(0, sizeof(struct bigmac));

	if(version_printed++ == 0)
		printk(version);

	/* Report what we have found to the user. */
	printk("%s: BigMAC 100baseT Ethernet ", dev->name);
	dev->base_addr = (long) qec_sdev;
	for(i = 0; i < 6; i++)
		printk("%2.2x%c", dev->dev_addr[i] = idprom->id_ethaddr[i],
		       i == 5 ? ' ' : ':');
	printk("\n");

	/* Setup softc, with backpointers to QEC and BigMAC SBUS device structs. */
	bp = (struct bigmac *) dev->priv;
	bp->qec_sbus_dev = qec_sdev;
	bp->bigmac_sbus_dev = qec_sdev->child;

	/* All further failures we find return this. */
	res = ENODEV;

	/* Verify the registers we expect, are actually there. */
	if((bp->bigmac_sbus_dev->num_registers != 3) ||
	   (bp->qec_sbus_dev->num_registers != 2)) {
		printk("BIGMAC: Device does not have 2 and 3 regs, it has %d and %d.\n",
		       bp->qec_sbus_dev->num_registers,
		       bp->bigmac_sbus_dev->num_registers);
		printk("BIGMAC: Would you like that for here or to go?\n");
		goto fail_and_cleanup;
	}

	/* Fun with QEC ranges... */
	if(bp->bigmac_sbus_dev->ranges_applied == 0) {
		i = prom_getproperty(bp->qec_sbus_dev->prom_node, "ranges",
				     (char *)&qranges[0], sizeof(qranges));
		num_qranges = (i / sizeof(struct linux_prom_ranges));

		/* Now, apply all the ranges for the BigMAC. */
		for(j = 0; j < bp->bigmac_sbus_dev->num_registers; j++) {
			int k;

			for(k = 0; k < num_qranges; k++)
				if(bp->bigmac_sbus_dev->reg_addrs[j].which_io ==
				   qranges[k].ot_child_space)
					break;
			if(k >= num_qranges) {
				printk("BigMAC: Aieee, bogus QEC range for space %08x\n",
				       bp->bigmac_sbus_dev->reg_addrs[j].which_io);
				goto fail_and_cleanup;
			}
			bp->bigmac_sbus_dev->reg_addrs[j].which_io = qranges[k].ot_parent_space;
			bp->bigmac_sbus_dev->reg_addrs[j].phys_addr += qranges[k].ot_parent_base;
		}

		/* Next, apply SBUS ranges on top of what we just changed. */
		prom_apply_sbus_ranges(bp->bigmac_sbus_dev->my_bus,
				       &bp->bigmac_sbus_dev->reg_addrs[0],
				       bp->bigmac_sbus_dev->num_registers,
				       bp->bigmac_sbus_dev);
	}

	/* Apply SBUS ranges for the QEC parent. */
	prom_apply_sbus_ranges(bp->qec_sbus_dev->my_bus,
			       &bp->qec_sbus_dev->reg_addrs[0],
			       bp->qec_sbus_dev->num_registers,
			       bp->qec_sbus_dev);

	/* Map in QEC global control registers. */
	bp->gregs = sparc_alloc_io(bp->qec_sbus_dev->reg_addrs[0].phys_addr,
				   0,
				   sizeof(struct qe_globreg),
				   "BigMAC QEC Global Regs",
				   bp->qec_sbus_dev->reg_addrs[0].which_io,
				   0);
	if(!bp->gregs) {
		printk("BIGMAC: Cannot map QEC global registers.\n");
		goto fail_and_cleanup;
	}

	/* Make sure QEC is in BigMAC mode. */
	if((bp->gregs->ctrl & 0xf0000000) != GLOB_CTRL_BMODE) {
		printk("BigMAC: AIEEE, QEC is not in BigMAC mode!\n");
		goto fail_and_cleanup;
	}

	/* Reset the QEC. */
	if(qec_global_reset(bp->gregs))
		goto fail_and_cleanup;

	/* Get supported SBUS burst sizes. */
	bsizes = prom_getintdefault(bp->qec_sbus_dev->prom_node,
				    "burst-sizes",
				    0xff);

	bsizes_more = prom_getintdefault(bp->qec_sbus_dev->my_bus->prom_node,
					 "burst-sizes",
					 0xff);

	bsizes &= 0xff;
	if(bsizes_more != 0xff)
		bsizes &= bsizes_more;
	if(bsizes == 0xff || (bsizes & DMA_BURST16) == 0 ||
	   (bsizes & DMA_BURST32) == 0)
		bsizes = (DMA_BURST32 - 1);
	bp->bigmac_bursts = bsizes;

	/* Perform QEC initialization. */
	qec_init(bp);

	/* Map in the BigMAC channel registers. */
	bp->creg = sparc_alloc_io(bp->bigmac_sbus_dev->reg_addrs[0].phys_addr,
				  0,
				  sizeof(struct qe_creg),
				  "BigMAC QEC Channel Regs",
				  bp->bigmac_sbus_dev->reg_addrs[0].which_io,
				  0);
	if(!bp->creg) {
		printk("BIGMAC: Cannot map QEC channel registers.\n");
		goto fail_and_cleanup;
	}

	/* Map in the BigMAC control registers. */
	bp->bregs = sparc_alloc_io(bp->bigmac_sbus_dev->reg_addrs[1].phys_addr,
				   0,
				   sizeof(struct BIG_MAC_regs),
				   "BigMAC Primary Regs",
				   bp->bigmac_sbus_dev->reg_addrs[1].which_io,
				   0);
	if(!bp->bregs) {
		printk("BIGMAC: Cannot map BigMAC primary registers.\n");
		goto fail_and_cleanup;
	}

	/* Map in the BigMAC transceiver registers, this is how you poke at
	 * the BigMAC's PHY.
	 */
	bp->tregs = sparc_alloc_io(bp->bigmac_sbus_dev->reg_addrs[2].phys_addr,
				   0,
				   sizeof(struct bmac_tcvr),
				   "BigMAC Transceiver Regs",
				   bp->bigmac_sbus_dev->reg_addrs[2].which_io,
				   0);
	if(!bp->tregs) {
		printk("BIGMAC: Cannot map BigMAC transceiver registers.\n");
		goto fail_and_cleanup;
	}

	/* Stop the BigMAC. */
	bigmac_stop(bp);

	/* Allocate transmit/receive descriptor DVMA block. */
	bp->bmac_block = (struct bmac_init_block *)
		sparc_dvma_malloc(PAGE_SIZE, "BigMAC Init Block",
				  &bp->bblock_dvma);

	/* Get the board revision of this BigMAC. */
	bp->board_rev = prom_getintdefault(bp->bigmac_sbus_dev->prom_node,
					   "board-version", 1);

	/* If on sun4c, we use a static buffer pool, on sun4m we DMA directly
	 * in and out of sk_buffs instead for speed and one copy to userspace.
	 */
#ifndef __sparc_v9__
	if(sparc_cpu_model == sun4c)
		bp->sun4c_buffers = (struct bigmac_buffers *)
			sparc_dvma_malloc(sizeof(struct bigmac_buffers),
					  "BigMAC Bufs",
					  &bp->s4c_buf_dvma);
	else
#endif
		bp->sun4c_buffers = 0;

	/* Init auto-negotiation timer state. */
	init_timer(&bp->bigmac_timer);
	bp->timer_state = asleep;
	bp->timer_ticks = 0;

	/* Backlink to generic net device struct. */
	bp->dev = dev;

	/* Set links to our BigMAC open and close routines. */
	dev->open = &bigmac_open;
	dev->stop = &bigmac_close;

	/* Choose transmit routine based upon buffering scheme. */
#ifndef __sparc_v9__
	if(sparc_cpu_model == sun4c)
		dev->hard_start_xmit = &sun4c_bigmac_start_xmit;
	else
#endif
		dev->hard_start_xmit = &bigmac_start_xmit;

	/* Set links to BigMAC statistic and multi-cast loading code. */
	dev->get_stats = &bigmac_get_stats;
	dev->set_multicast_list = &bigmac_set_multicast;

	/* Finish net device registration. */
	dev->irq = bp->bigmac_sbus_dev->irqs[0];
	dev->dma = 0;
	ether_setup(dev);

#ifdef MODULE
	/* Put us into the list of instances attached for later module unloading. */
	bp->next_module = root_bigmac_dev;
	root_bigmac_dev = bp;
#endif
	return 0;

fail_and_cleanup:
	/* Something went wrong, undo whatever we did so far. */
	if(bp) {
		/* Free register mappings if any. */
		if(bp->gregs)
			sparc_free_io(bp->gregs, sizeof(struct qe_globreg));
		if(bp->creg)
			sparc_free_io(bp->creg, sizeof(struct qe_creg));
		if(bp->bregs)
			sparc_free_io(bp->bregs, sizeof(struct BIG_MAC_regs));
		if(bp->tregs)
			sparc_free_io(bp->tregs, sizeof(struct bmac_tcvr));

		/* XXX todo, bmac_block and sun4c_buffers */

		/* Free the BigMAC softc. */
		kfree(bp);
		dev->priv = 0;
	}
	return res;	/* Return error code. */
}

__initfunc(int bigmac_probe(struct device *dev))
{
	struct linux_sbus *bus;
	struct linux_sbus_device *sdev = 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;

			/* QEC can be the parent of either QuadEthernet or
			 * a BigMAC.  We want the latter.
			 */
			if(!strcmp(sdev->prom_name, "qec") && sdev->child &&
			   !strcmp(sdev->child->prom_name, "be")) {
				cards++;
				if((v = bigmac_ether_init(dev, sdev)))
				   return v;
			}
		}
	}
	if(!cards)
		return ENODEV;
	return 0;
}

#ifdef MODULE

int
init_module(void)
{
	root_bigmac_dev = NULL;
	return bigmac_probe(NULL);
}

void
cleanup_module(void)
{
	/* No need to check MOD_IN_USE, as sys_delete_module() checks. */
	while (root_bigmac_dev) {
		struct bigmac *bp = root_bigmac_dev;
		struct bigmac *bp_nxt = root_bigmac_dev->next_module;

		sparc_free_io(bp->gregs, sizeof(struct qe_globreg));
		sparc_free_io(bp->creg, sizeof(struct qe_creg));
		sparc_free_io(bp->bregs, sizeof(struct BIG_MAC_regs));
		sparc_free_io(bp->tregs, sizeof(struct bmac_tcvr));

		/* XXX todo, bmac_block and sun4c_buffers */

		unregister_netdev(bp->dev);
		kfree(bp->dev);
		root_bigmac_dev = bp_nxt;
	}
}

#endif /* MODULE */