1998-11-30 OKUJI Yoshinori <okuji@kuicr.kyoto-u.ac.jp>

	Clean up linux emulation code to make it architecture-independent
	as much as possible.

	* linux: Renamed from linuxdev.
	* Makefile.in (objfiles): Add linux.o instead of linuxdev.o.
	(MAKE): New variable. Used for the linux.o target.
	* configure.in: Add AC_CHECK_TOOL(MAKE, make).
	* i386/i386/spl.h: Include <i386/ipl.h>, for compatibility with
	OSF Mach 3.0. Suggested by Elgin Lee <ehl@funghi.com>.
	* linux/src: Renamed from linux/linux.
	* linux/dev: Renamed from linux/mach.
	* linux/Drivers.in (AC_INIT): Use dev/include/linux/autoconf.h,
	instead of mach/include/linux/autoconf.h.
	* Makefile.in (all): Target ../linux.o instead of ../linuxdev.o.
	* linux/dev/drivers/block/genhd.c: Include <machine/spl.h> instead
	of <i386/ipl.h>.
	* linux/dev/drivers/net/auto_irq.c: Remove unneeded header files,
	<i386/ipl.h> and <i386/pic.h>.
	* linux/dev/init/main.c: Many i386-dependent codes moved to ...
	* linux/dev/arch/i386/irq.c: ... here.
	* linux/dev/arch/i386/setup.c: New file.
	* linux/dev/arch/i386/linux_emul.h: Likewise.
	* linux/dev/arch/i386/glue/timer.c: Merged into sched.c.
	* linux/dev/arch/i386/glue/sched.c: Include <machine/spl.h> instead
	of <i386/ipl.h>, and moved to ...
	* linux/dev/kernel/sched.c: ... here.
	* linux/dev/arch/i386/glue/block.c: Include <machine/spl.h> and
	<linux_emul.h>, instead of i386-dependent header files, and
	moved to ...
	* linux/dev/glue/blocl.c: ... here.
	* linux/dev/arch/i386/glue/net.c: Include <machine/spl.h> and
	<linux_emul.h>, instead of i386-dependent header files, and
	moved to ...
	* linux/dev/glue/net.c: ... here.
	* linux/dev/arch/i386/glue/misc.c: Remove `x86' and moved to ...
	* linux/dev/glue/misc.c: ... here.
	* linux/dev/arch/i386/glue/kmem.c: Moved to ...
	* linux/dev/glue/kmem.c: ... here.

1 files changed, 1302 insertions, 0 deletions

diff --git a/linux/src/drivers/net/yellowfin.c b/linux/src/drivers/net/yellowfin.c
new file mode 100644
index 0000000..c8e5314
--- /dev/null
+++ b/linux/src/drivers/net/yellowfin.c
@@ -0,0 +1,1302 @@
+/* yellowfin.c: A Packet Engines G-NIC ethernet driver for linux. */
+/*
+	Written 1997-1998 by Donald Becker.
+
+	This software may be used and distributed according to the terms
+	of the GNU Public License, incorporated herein by reference.
+
+	This driver is for the Packet Engines G-NIC PCI Gigabit Ethernet adapter.
+	It also supports the Symbios Logic version of the same chip core.
+
+	The author may be reached as becker@CESDIS.gsfc.nasa.gov, or C/O
+	Center of Excellence in Space Data and Information Sciences
+	   Code 930.5, Goddard Space Flight Center, Greenbelt MD 20771
+
+	Support and updates available at
+	http://cesdis.gsfc.nasa.gov/linux/drivers/yellowfin.html
+*/
+
+static const char *version = "yellowfin.c:v0.99A 4/7/98 becker@cesdis.gsfc.nasa.gov\n";
+
+/* A few user-configurable values. */
+
+static int max_interrupt_work = 20;
+static int min_pci_latency = 64;
+static int mtu = 0;
+#ifdef YF_PROTOTYPE			/* Support for prototype hardware errata. */
+/* System-wide count of bogus-rx frames. */
+static int bogus_rx = 0;
+static int dma_ctrl = 0x004A0263; 			/* Constrained by errata */
+static int fifo_cfg = 0x0020;				/* Bypass external Tx FIFO. */
+#elif YF_NEW					/* A future perfect board :->.  */
+static int dma_ctrl = 0x00CAC277;			/* Override when loading module! */
+static int fifo_cfg = 0x0028;
+#else
+static int dma_ctrl = 0x004A0263; 			/* Constrained by errata */
+static int fifo_cfg = 0x0020;				/* Bypass external Tx FIFO. */
+#endif
+
+/* Set the copy breakpoint for the copy-only-tiny-frames scheme.
+   Setting to > 1518 effectively disables this feature. */
+static const int rx_copybreak = 100;
+
+/* Keep the ring sizes a power of two for efficiency.
+   Making the Tx ring too large decreases the effectiveness of channel
+   bonding and packet priority.
+   There are no ill effects from too-large receive rings. */
+#define TX_RING_SIZE	16
+#define RX_RING_SIZE	32
+
+/* Operational parameters that usually are not changed. */
+/* Time in jiffies before concluding the transmitter is hung. */
+#define TX_TIMEOUT  ((2000*HZ)/1000)
+
+#include <linux/config.h>
+#ifdef MODULE
+#ifdef MODVERSIONS
+#include <linux/modversions.h>
+#endif
+#include <linux/module.h>
+#include <linux/version.h>
+#else
+#define MOD_INC_USE_COUNT
+#define MOD_DEC_USE_COUNT
+#endif
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/ptrace.h>
+#include <linux/errno.h>
+#include <linux/ioport.h>
+#include <linux/malloc.h>
+#include <linux/interrupt.h>
+#include <linux/pci.h>
+#include <linux/bios32.h>
+#include <asm/processor.h>		/* Processor type for cache alignment. */
+#include <asm/bitops.h>
+#include <asm/io.h>
+
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+
+/* Kernel compatibility defines, common to David Hind's PCMCIA package.
+   This is only in the support-all-kernels source code. */
+#include <linux/version.h>		/* Evil, but neccessary */
+
+#if defined (LINUX_VERSION_CODE) && LINUX_VERSION_CODE < 0x10300
+#define RUN_AT(x) (x)			/* What to put in timer->expires.  */
+#define DEV_ALLOC_SKB(len) alloc_skb(len, GFP_ATOMIC)
+#define virt_to_bus(addr)  ((unsigned long)addr)
+#define bus_to_virt(addr) ((void*)addr)
+
+#else  /* 1.3.0 and later */
+#define RUN_AT(x) (jiffies + (x))
+#define DEV_ALLOC_SKB(len) dev_alloc_skb(len + 2)
+#endif
+
+#if defined (LINUX_VERSION_CODE) && LINUX_VERSION_CODE < 0x10338
+#ifdef MODULE
+#if !defined(CONFIG_MODVERSIONS) && !defined(__NO_VERSION__)
+char kernel_version[] = UTS_RELEASE;
+#endif
+#else
+#undef MOD_INC_USE_COUNT
+#define MOD_INC_USE_COUNT
+#undef MOD_DEC_USE_COUNT
+#define MOD_DEC_USE_COUNT
+#endif
+#endif /* 1.3.38 */
+
+#if (LINUX_VERSION_CODE >= 0x10344)
+#define NEW_MULTICAST
+#include <linux/delay.h>
+#endif
+#if (LINUX_VERSION_CODE >= 0x20100)
+char kernel_version[] = UTS_RELEASE;
+#endif
+#ifdef SA_SHIRQ
+#define IRQ(irq, dev_id, pt_regs) (irq, dev_id, pt_regs)
+#else
+#define IRQ(irq, dev_id, pt_regs) (irq, pt_regs)
+#endif
+#if (LINUX_VERSION_CODE < 0x20123)
+#define test_and_set_bit(val, addr) set_bit(val, addr)
+#endif
+
+static const char *card_name = "Yellowfin G-NIC Gbit Ethernet";
+
+/* The PCI I/O space extent. */
+#define YELLOWFIN_TOTAL_SIZE 0x100
+
+#ifdef HAVE_DEVLIST
+struct netdev_entry yellowfin_drv =
+{card_name, yellowfin_pci_probe, YELLOWFIN_TOTAL_SIZE, NULL};
+#endif
+
+#ifdef YELLOWFIN_DEBUG
+int yellowfin_debug = YELLOWFIN_DEBUG;
+#else
+int yellowfin_debug = 1;
+#endif
+
+/*
+				Theory of Operation
+
+I. Board Compatibility
+
+This device driver is designed for the Packet Engines "Yellowfin" Gigabit
+Ethernet adapter.  The only PCA currently supported is the G-NIC 64-bit
+PCI card.
+
+II. Board-specific settings
+
+PCI bus devices are configured by the system at boot time, so no jumpers
+need to be set on the board.  The system BIOS preferably should assign the
+PCI INTA signal to an otherwise unused system IRQ line.
+Note: Kernel versions earlier than 1.3.73 do not support shared PCI
+interrupt lines.
+
+III. Driver operation
+
+IIIa. Ring buffers
+
+The Yellowfin uses the Descriptor Based DMA Architecture specified by Apple.
+This is a descriptor list scheme similar to that used by the EEPro100 and
+Tulip.  This driver uses two statically allocated fixed-size descriptor lists
+formed into rings by a branch from the final descriptor to the beginning of
+the list.  The ring sizes are set at compile time by RX/TX_RING_SIZE.
+
+The driver allocates full frame size skbuffs for the Rx ring buffers at
+open() time and passes the skb->data field to the Yellowfin as receive data
+buffers.  When an incoming frame is less than RX_COPYBREAK bytes long,
+a fresh skbuff is allocated and the frame is copied to the new skbuff.
+When the incoming frame is larger, the skbuff is passed directly up the
+protocol stack and replaced by a newly allocated skbuff.
+
+The RX_COPYBREAK value is chosen to trade-off the memory wasted by
+using a full-sized skbuff for small frames vs. the copying costs of larger
+frames.  For small frames the copying cost is negligible (esp. considering
+that we are pre-loading the cache with immediately useful header
+information).  For large frames the copying cost is non-trivial, and the
+larger copy might flush the cache of useful data.
+
+IIIC. Synchronization
+
+The driver runs as two independent, single-threaded flows of control.  One
+is the send-packet routine, which enforces single-threaded use by the
+dev->tbusy flag.  The other thread is the interrupt handler, which is single
+threaded by the hardware and other software.
+
+The send packet thread has partial control over the Tx ring and 'dev->tbusy'
+flag.  It sets the tbusy flag whenever it's queuing a Tx packet. If the next
+queue slot is empty, it clears the tbusy flag when finished otherwise it sets
+the 'yp->tx_full' flag.
+
+The interrupt handler has exclusive control over the Rx ring and records stats
+from the Tx ring.  After reaping the stats, it marks the Tx queue entry as
+empty by incrementing the dirty_tx mark. Iff the 'yp->tx_full' flag is set, it
+clears both the tx_full and tbusy flags.
+
+IV. Notes
+
+Thanks to Kim Stearns of Packet Engines for providing a pair of G-NIC boards.
+
+IVb. References
+
+Yellowfin Engineering Design Specification, 4/23/97 Preliminary/Confidential
+http://cesdis.gsfc.nasa.gov/linux/misc/100mbps.html
+
+IVc. Errata
+
+See Packet Engines confidential appendix.
+
+*/
+
+/* A few values that may be tweaked. */
+#define PKT_BUF_SZ		1536			/* Size of each temporary Rx buffer.*/
+
+#ifndef PCI_VENDOR_ID_PKT_ENG		/* To be defined in linux/pci.h */
+#define PCI_VENDOR_ID_PKT_ENG			0x1000 /* Hmm, likely number.. */
+#define PCI_DEVICE_ID_YELLOWFIN			0x0702
+#endif
+
+/* The rest of these values should never change. */
+
+static void yellowfin_timer(unsigned long data);
+
+/* Offsets to the Yellowfin registers.  Various sizes and alignments. */
+enum yellowfin_offsets {
+	TxCtrl=0x00, TxStatus=0x04, TxPtr=0x0C,
+	TxIntrSel=0x10, TxBranchSel=0x14, TxWaitSel=0x18,
+	RxCtrl=0x40, RxStatus=0x44, RxPtr=0x4C,
+	RxIntrSel=0x50, RxBranchSel=0x54, RxWaitSel=0x58,
+	EventStatus=0x80, IntrEnb=0x82, IntrClear=0x84, IntrStatus=0x86,
+	ChipRev=0x8C, DMACtrl=0x90, Cnfg=0xA0, RxDepth=0xB8, FlowCtrl=0xBC,
+	AddrMode=0xD0, StnAddr=0xD2, HashTbl=0xD8, FIFOcfg=0xF8,
+};
+
+/* The Yellowfin Rx and Tx buffer descriptors. */
+struct yellowfin_desc {
+	u16 request_cnt;
+	u16 cmd;
+	u32 addr;
+	u32 branch_addr;
+	u16 result_cnt;
+	u16 status;
+};
+
+struct tx_status_words {
+	u16 tx_cnt;
+	u16 tx_errs;
+	u16 total_tx_cnt;
+	u16 paused;
+};
+
+/* Bits in yellowfin_desc.cmd */
+enum desc_cmd_bits {
+	CMD_TX_PKT=0x1000, CMD_RX_BUF=0x2000, CMD_TXSTATUS=0x3000,
+	CMD_NOP=0x6000, CMD_STOP=0x7000,
+	BRANCH_ALWAYS=0x0C, INTR_ALWAYS=0x30, WAIT_ALWAYS=0x03,
+	BRANCH_IFTRUE=0x04,
+};
+
+/* Bits in yellowfin_desc.status */
+enum desc_status_bits { RX_EOP=0x0040, };
+
+/* Bits in the interrupt status/mask registers. */
+enum intr_status_bits {
+	IntrRxDone=0x01, IntrRxInvalid=0x02, IntrRxPCIFault=0x04,IntrRxPCIErr=0x08,
+	IntrTxDone=0x10, IntrTxInvalid=0x20, IntrTxPCIFault=0x40,IntrTxPCIErr=0x80,
+	IntrEarlyRx=0x100, IntrWakeup=0x200, };
+
+struct yellowfin_private {
+	/* Descriptor rings first for alignment.  Tx requires a second descriptor
+	   for status. */
+	struct yellowfin_desc rx_ring[RX_RING_SIZE];
+	struct yellowfin_desc tx_ring[TX_RING_SIZE*2];
+	const char *product_name;
+	struct device *next_module;
+	/* The saved address of a sent-in-place packet/buffer, for skfree(). */
+	struct sk_buff* tx_skbuff[TX_RING_SIZE];
+	struct tx_status_words tx_status[TX_RING_SIZE];
+	/* The addresses of receive-in-place skbuffs. */
+	struct sk_buff* rx_skbuff[RX_RING_SIZE];
+	int chip_id;
+	struct enet_statistics stats;
+	struct timer_list timer;	/* Media selection timer. */
+	int in_interrupt;
+	unsigned int cur_rx, cur_tx;		/* The next free ring entry */
+	unsigned int dirty_rx, dirty_tx;	/* The ring entries to be free()ed. */
+	unsigned int tx_full:1;				/* The Tx queue is full. */
+	unsigned int full_duplex:1;			/* Full-duplex operation requested. */
+	unsigned int medialock:1;			/* Do not sense media. */
+	unsigned int default_port:4;		/* Last dev->if_port value. */
+	u32 pad[4];							/* Used for 32-byte alignment */
+};
+
+#ifdef MODULE
+/* Used to pass the media type, etc. */
+#define MAX_UNITS 8				/* More are supported, limit only on options */
+static int options[MAX_UNITS] = {-1, -1, -1, -1, -1, -1, -1, -1};
+
+#if LINUX_VERSION_CODE > 0x20115
+MODULE_AUTHOR("Donald Becker <becker@cesdis.gsfc.nasa.gov>");
+MODULE_DESCRIPTION("Packet Engines Yellowfin G-NIC Gigabit Ethernet driver");
+MODULE_PARM(max_interrupt_work, "i");
+MODULE_PARM(min_pci_latency, "i");
+MODULE_PARM(mtu, "i");
+MODULE_PARM(debug, "i");
+MODULE_PARM(rx_copybreak, "i");
+MODULE_PARM(options, "1-" __MODULE_STRING(MAX_UNITS) "i");
+#endif
+
+#endif
+
+static struct device *yellowfin_probe1(struct device *dev, int ioaddr, int irq,
+								   int chip_id, int options);
+static int yellowfin_open(struct device *dev);
+static void yellowfin_timer(unsigned long data);
+static void yellowfin_tx_timeout(struct device *dev);
+static void yellowfin_init_ring(struct device *dev);
+static int yellowfin_start_xmit(struct sk_buff *skb, struct device *dev);
+static int yellowfin_rx(struct device *dev);
+static void yellowfin_interrupt IRQ(int irq, void *dev_instance, struct pt_regs *regs);
+static int yellowfin_close(struct device *dev);
+static struct enet_statistics *yellowfin_get_stats(struct device *dev);
+#ifdef NEW_MULTICAST
+static void set_rx_mode(struct device *dev);
+#else
+static void set_rx_mode(struct device *dev, int num_addrs, void *addrs);
+#endif
+
+
+
+#ifdef MODULE
+/* A list of all installed Yellowfin devices, for removing the driver module. */
+static struct device *root_yellowfin_dev = NULL;
+#endif
+
+int yellowfin_probe(struct device *dev)
+{
+	int cards_found = 0;
+	static int pci_index = 0;	/* Static, for multiple probe calls. */
+
+	/* Ideally we would detect all network cards in slot order.  That would
+	   be best done a central PCI probe dispatch, which wouldn't work
+	   well with the current structure.  So instead we detect just the
+	   Yellowfin cards in slot order. */
+
+	if (pcibios_present()) {
+		unsigned char pci_bus, pci_device_fn;
+
+		for (;pci_index < 0xff; pci_index++) {
+			u8 pci_irq_line, pci_latency;
+			u16 pci_command, vendor, device;
+			u32 pci_ioaddr, chip_idx = 0;
+
+#ifdef REVERSE_PROBE_ORDER
+			if (pcibios_find_class (PCI_CLASS_NETWORK_ETHERNET << 8,
+									0xfe - pci_index,
+									&pci_bus, &pci_device_fn)
+				!= PCIBIOS_SUCCESSFUL)
+				continue;
+#else
+			if (pcibios_find_class (PCI_CLASS_NETWORK_ETHERNET << 8,
+									pci_index,
+									&pci_bus, &pci_device_fn)
+				!= PCIBIOS_SUCCESSFUL)
+				break;
+#endif
+			pcibios_read_config_word(pci_bus, pci_device_fn,
+									 PCI_VENDOR_ID, &vendor);
+			pcibios_read_config_word(pci_bus, pci_device_fn,
+									 PCI_DEVICE_ID, &device);
+			pcibios_read_config_byte(pci_bus, pci_device_fn,
+									 PCI_INTERRUPT_LINE, &pci_irq_line);
+			pcibios_read_config_dword(pci_bus, pci_device_fn,
+									  PCI_BASE_ADDRESS_0, &pci_ioaddr);
+			/* Remove I/O space marker in bit 0. */
+			pci_ioaddr &= ~3;
+
+			if (vendor != PCI_VENDOR_ID_PKT_ENG)
+				continue;
+
+			if (device != PCI_DEVICE_ID_YELLOWFIN)
+				continue;
+
+			if (yellowfin_debug > 2)
+				printk("Found Packet Engines Yellowfin G-NIC at I/O %#x, IRQ %d.\n",
+					   pci_ioaddr, pci_irq_line);
+
+			if (check_region(pci_ioaddr, YELLOWFIN_TOTAL_SIZE))
+				continue;
+
+#ifdef MODULE
+			dev = yellowfin_probe1(dev, pci_ioaddr, pci_irq_line, chip_idx,
+						 cards_found < MAX_UNITS ? options[cards_found] : 0);
+#else
+			dev = yellowfin_probe1(dev, pci_ioaddr, pci_irq_line, chip_idx,
+						 dev ? dev->mem_start : 0);
+#endif
+
+			if (dev) {
+			  /* Get and check the bus-master and latency values. */
+			  pcibios_read_config_word(pci_bus, pci_device_fn,
+									   PCI_COMMAND, &pci_command);
+			  if ( ! (pci_command & PCI_COMMAND_MASTER)) {
+				printk("  PCI Master Bit has not been set! Setting...\n");
+				pci_command |= PCI_COMMAND_MASTER;
+				pcibios_write_config_word(pci_bus, pci_device_fn,
+										  PCI_COMMAND, pci_command);
+			  }
+			  pcibios_read_config_byte(pci_bus, pci_device_fn,
+									   PCI_LATENCY_TIMER, &pci_latency);
+			  if (pci_latency < min_pci_latency) {
+				printk("  PCI latency timer (CFLT) is unreasonably low at %d."
+					   "  Setting to %d clocks.\n",
+					   pci_latency, min_pci_latency);
+				pcibios_write_config_byte(pci_bus, pci_device_fn,
+										  PCI_LATENCY_TIMER, min_pci_latency);
+			  } else if (yellowfin_debug > 1)
+				printk("  PCI latency timer (CFLT) is %#x.\n", pci_latency);
+			  dev = 0;
+			  cards_found++;
+			}
+		}
+	}
+
+#if defined (MODULE)
+	return cards_found;
+#else
+	return 0;
+#endif
+}
+
+static struct device *yellowfin_probe1(struct device *dev, int ioaddr, int irq,
+								   int chip_id, int options)
+{
+	static int did_version = 0;			/* Already printed version info. */
+	struct yellowfin_private *yp;
+	int i;
+
+	if (yellowfin_debug > 0  &&  did_version++ == 0)
+		printk(version);
+
+	dev = init_etherdev(dev, sizeof(struct yellowfin_private));
+
+	printk("%s: P-E Yellowfin type %8x at %#3x, ",
+		   dev->name, inl(ioaddr + ChipRev), ioaddr);
+
+	for (i = 0; i < 5; i++)
+		printk("%2.2x:", inb(ioaddr + StnAddr + i));
+	printk("%2.2x, IRQ %d.\n", inb(ioaddr + StnAddr + i), irq);
+	for (i = 0; i < 6; i++)
+		dev->dev_addr[i] = inb(ioaddr + StnAddr + i);
+
+	/* Reset the chip. */
+	outl(0x80000000, ioaddr + DMACtrl);
+
+
+	/* We do a request_region() only to register /proc/ioports info. */
+	request_region(ioaddr, YELLOWFIN_TOTAL_SIZE, card_name);
+
+	dev->base_addr = ioaddr;
+	dev->irq = irq;
+
+	/* Make certain the descriptor lists are aligned. */
+	yp = (void *)(((long)kmalloc(sizeof(*yp), GFP_KERNEL) + 31) & ~31);
+	memset(yp, 0, sizeof(*yp));
+	dev->priv = yp;
+
+#ifdef MODULE
+	yp->next_module = root_yellowfin_dev;
+	root_yellowfin_dev = dev;
+#endif
+
+	yp->chip_id = chip_id;
+
+	yp->full_duplex = 1;
+#ifdef YELLOWFIN_DEFAULT_MEDIA
+	yp->default_port = YELLOWFIN_DEFAULT_MEDIA;
+#endif
+#ifdef YELLOWFIN_NO_MEDIA_SWITCH
+	yp->medialock = 1;
+#endif
+
+	/* The lower four bits are the media type. */
+	if (options > 0) {
+		yp->full_duplex = (options & 16) ? 1 : 0;
+		yp->default_port = options & 15;
+		if (yp->default_port)
+			yp->medialock = 1;
+	}
+
+	/* The Yellowfin-specific entries in the device structure. */
+	dev->open = &yellowfin_open;
+	dev->hard_start_xmit = &yellowfin_start_xmit;
+	dev->stop = &yellowfin_close;
+	dev->get_stats = &yellowfin_get_stats;
+	dev->set_multicast_list = &set_rx_mode;
+	if (mtu)
+		dev->mtu = mtu;
+
+	/* todo: Reset the xcvr interface and turn on heartbeat. */
+
+	return dev;
+}
+
+
+static int
+yellowfin_open(struct device *dev)
+{
+	struct yellowfin_private *yp = (struct yellowfin_private *)dev->priv;
+	int ioaddr = dev->base_addr;
+
+	/* Reset the chip. */
+	outl(0x80000000, ioaddr + DMACtrl);
+
+#ifdef SA_SHIRQ
+	if (request_irq(dev->irq, &yellowfin_interrupt, SA_SHIRQ,
+					card_name, dev)) {
+		return -EAGAIN;
+	}
+#else
+	if (irq2dev_map[dev->irq] != NULL
+		|| (irq2dev_map[dev->irq] = dev) == NULL
+		|| dev->irq == 0
+		|| request_irq(dev->irq, &yellowfin_interrupt, 0, card_name)) {
+		return -EAGAIN;
+	}
+#endif
+
+	if (yellowfin_debug > 1)
+		printk("%s: yellowfin_open() irq %d.\n", dev->name, dev->irq);
+
+	MOD_INC_USE_COUNT;
+
+	yellowfin_init_ring(dev);
+
+	outl(virt_to_bus(yp->rx_ring), ioaddr + RxPtr);
+	outl(virt_to_bus(yp->tx_ring), ioaddr + TxPtr);
+
+	/* Set up various condition 'select' registers.
+	   There are no options here. */
+	outl(0x00800080, ioaddr + TxIntrSel); 	/* Interrupt on Tx abort */
+	outl(0x00800080, ioaddr + TxBranchSel);	/* Branch on Tx abort */
+	outl(0x00400040, ioaddr + TxWaitSel); 	/* Wait on Tx status */
+	outl(0x00400040, ioaddr + RxIntrSel);	/* Interrupt on Rx done */
+	outl(0x00400040, ioaddr + RxBranchSel);	/* Branch on Rx error */
+	outl(0x00400040, ioaddr + RxWaitSel);	/* Wait on Rx done */
+
+	/* Initialize other registers: with so many this eventually this will
+	   converted to an offset/value list. */
+	outl(dma_ctrl, ioaddr + DMACtrl);
+	outw(fifo_cfg, ioaddr + FIFOcfg);
+	/* Enable automatic generation of flow control frames, period 0xffff. */
+	outl(0x0030FFFF, ioaddr + FlowCtrl);
+
+	if (dev->if_port == 0)
+		dev->if_port = yp->default_port;
+
+	dev->tbusy = 0;
+	dev->interrupt = 0;
+	yp->in_interrupt = 0;
+
+	/* We are always in full-duplex mode with the current chip! */
+	yp->full_duplex = 1;
+
+	/* Setting the Rx mode will start the Rx process. */
+	outw(0x01CD | (yp->full_duplex ? 2 : 0), ioaddr + Cnfg);
+#ifdef NEW_MULTICAST
+	set_rx_mode(dev);
+#else
+	set_rx_mode(dev, 0, 0);
+#endif
+
+	dev->start = 1;
+
+	/* Enable interrupts by setting the interrupt mask. */
+	outw(0x81ff, ioaddr + IntrEnb);			/* See enum intr_status_bits */
+	outw(0x0000, ioaddr + EventStatus);		/* Clear non-interrupting events */
+	outl(0x80008000, ioaddr + RxCtrl);		/* Start Rx and Tx channels. */
+	outl(0x80008000, ioaddr + TxCtrl);
+
+	if (yellowfin_debug > 2) {
+		printk("%s: Done yellowfin_open().\n",
+			   dev->name);
+	}
+	/* Set the timer to check for link beat. */
+	init_timer(&yp->timer);
+	yp->timer.expires = RUN_AT((24*HZ)/10);			/* 2.4 sec. */
+	yp->timer.data = (unsigned long)dev;
+	yp->timer.function = &yellowfin_timer;				/* timer handler */
+	add_timer(&yp->timer);
+
+	return 0;
+}
+
+static void yellowfin_timer(unsigned long data)
+{
+	struct device *dev = (struct device *)data;
+	struct yellowfin_private *yp = (struct yellowfin_private *)dev->priv;
+	int ioaddr = dev->base_addr;
+	int next_tick = 0;
+
+	if (yellowfin_debug > 3) {
+		printk("%s: Yellowfin timer tick, status %8.8x.\n",
+			   dev->name, inl(ioaddr + IntrStatus));
+	}
+	if (next_tick) {
+		yp->timer.expires = RUN_AT(next_tick);
+		add_timer(&yp->timer);
+	}
+}
+
+static void yellowfin_tx_timeout(struct device *dev)
+{
+	struct yellowfin_private *yp = (struct yellowfin_private *)dev->priv;
+	int ioaddr = dev->base_addr;
+
+	printk("%s: Yellowfin transmit timed out, status %8.8x, resetting...\n",
+		   dev->name, inl(ioaddr));
+
+#ifndef __alpha__
+	{
+		int i;
+		printk("  Rx ring %8.8x: ", (int)yp->rx_ring);
+		for (i = 0; i < RX_RING_SIZE; i++)
+			printk(" %8.8x", (unsigned int)yp->rx_ring[i].status);
+		printk("\n  Tx ring %8.8x: ", (int)yp->tx_ring);
+		for (i = 0; i < TX_RING_SIZE; i++)
+			printk(" %4.4x /%4.4x", yp->tx_status[i].tx_errs, yp->tx_ring[i].status);
+		printk("\n");
+	}
+#endif
+
+  /* Perhaps we should reinitialize the hardware here. */
+  dev->if_port = 0;
+  /* Stop and restart the chip's Tx processes . */
+
+  /* Trigger an immediate transmit demand. */
+
+  dev->trans_start = jiffies;
+  yp->stats.tx_errors++;
+  return;
+}
+
+
+/* Initialize the Rx and Tx rings, along with various 'dev' bits. */
+static void
+yellowfin_init_ring(struct device *dev)
+{
+	struct yellowfin_private *yp = (struct yellowfin_private *)dev->priv;
+	int i;
+
+	yp->tx_full = 0;
+	yp->cur_rx = yp->cur_tx = 0;
+	yp->dirty_rx = yp->dirty_tx = 0;
+
+	for (i = 0; i < RX_RING_SIZE; i++) {
+		struct sk_buff *skb;
+		int pkt_buf_sz = (dev->mtu <= 1500 ? PKT_BUF_SZ : dev->mtu + 32);
+
+		yp->rx_ring[i].request_cnt = pkt_buf_sz;
+		yp->rx_ring[i].cmd = CMD_RX_BUF | INTR_ALWAYS;
+
+		skb = DEV_ALLOC_SKB(pkt_buf_sz);
+		skb_reserve(skb, 2);	/* 16 byte align the IP header. */
+		yp->rx_skbuff[i] = skb;
+		if (skb == NULL)
+			break;			/* Bad news!  */
+		skb->dev = dev;			/* Mark as being used by this device. */
+#if LINUX_VERSION_CODE > 0x10300
+		yp->rx_ring[i].addr = virt_to_bus(skb->tail);
+#else
+		yp->rx_ring[i].addr = virt_to_bus(skb->data);
+#endif
+		yp->rx_ring[i].branch_addr = virt_to_bus(&yp->rx_ring[i+1]);
+	}
+	/* Mark the last entry as wrapping the ring. */
+	yp->rx_ring[i-1].cmd = CMD_RX_BUF | INTR_ALWAYS | BRANCH_ALWAYS;
+	yp->rx_ring[i-1].branch_addr = virt_to_bus(&yp->rx_ring[0]);
+
+/*#define NO_TXSTATS*/
+#ifdef NO_TXSTATS
+	/* In this mode the Tx ring needs only a single descriptor. */
+	for (i = 0; i < TX_RING_SIZE; i++) {
+		yp->tx_skbuff[i] = 0;
+		yp->tx_ring[i].cmd = CMD_STOP;
+		yp->tx_ring[i].branch_addr = virt_to_bus(&yp->tx_ring[i+1]);
+	}
+	yp->tx_ring[--i].cmd = CMD_STOP | BRANCH_ALWAYS; /* Wrap ring */
+	yp->tx_ring[i].branch_addr = virt_to_bus(&yp->tx_ring[0]);
+#else
+	/* Tx ring needs a pair of descriptors, the second for the status. */
+	for (i = 0; i < TX_RING_SIZE*2; i++) {
+		yp->tx_skbuff[i/2] = 0;
+		yp->tx_ring[i].cmd = CMD_STOP; /* Branch on Tx error. */
+		yp->tx_ring[i].branch_addr = virt_to_bus(&yp->tx_ring[i+1]);
+		i++;
+		yp->tx_ring[i].cmd = CMD_TXSTATUS; /* Interrupt, no wait. */
+		yp->tx_ring[i].request_cnt = sizeof(yp->tx_status[i]);
+		yp->tx_ring[i].addr = virt_to_bus(&yp->tx_status[i/2]);
+		yp->tx_ring[i].branch_addr = virt_to_bus(&yp->tx_ring[i+1]);
+	}
+	/* Wrap ring */
+	yp->tx_ring[--i].cmd = CMD_TXSTATUS | BRANCH_ALWAYS | INTR_ALWAYS;
+	yp->tx_ring[i].branch_addr = virt_to_bus(&yp->tx_ring[0]);
+#endif
+}
+
+static int
+yellowfin_start_xmit(struct sk_buff *skb, struct device *dev)
+{
+	struct yellowfin_private *yp = (struct yellowfin_private *)dev->priv;
+	unsigned entry;
+
+	/* 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) {
+		if (jiffies - dev->trans_start < TX_TIMEOUT)
+			return 1;
+		yellowfin_tx_timeout(dev);
+		return 1;
+	}
+
+	/* Caution: the write order is important here, set the base address
+	   with the "ownership" bits last. */
+
+	/* Calculate the next Tx descriptor entry. */
+	entry = yp->cur_tx % TX_RING_SIZE;
+
+	yp->tx_skbuff[entry] = skb;
+
+#ifdef NO_TXSTATS
+	yp->tx_ring[entry].request_cnt = skb->len;
+	yp->tx_ring[entry].addr = virt_to_bus(skb->data);
+	yp->tx_ring[entry].status = 0;
+	if (entry >= TX_RING_SIZE-1) {
+		yp->tx_ring[0].cmd = CMD_STOP; /* New stop command. */
+		yp->tx_ring[TX_RING_SIZE-1].cmd = CMD_TX_PKT | BRANCH_ALWAYS;
+	} else {
+		yp->tx_ring[entry+1].cmd = CMD_STOP; /* New stop command. */
+		yp->tx_ring[entry].cmd = CMD_TX_PKT | BRANCH_IFTRUE;
+	}
+	yp->cur_tx++;
+#else
+	yp->tx_ring[entry<<1].request_cnt = skb->len;
+	yp->tx_ring[entry<<1].addr = virt_to_bus(skb->data);
+	/* The input_last (status-write) command is constant, but we must rewrite
+	   the subsequent 'stop' command. */
+
+	yp->cur_tx++;
+	{
+		unsigned next_entry = yp->cur_tx % TX_RING_SIZE;
+		yp->tx_ring[next_entry<<1].cmd = CMD_STOP;
+	}
+	/* Final step -- overwrite the old 'stop' command. */
+
+	yp->tx_ring[entry<<1].cmd =
+		(entry % 6) == 0 ? CMD_TX_PKT | INTR_ALWAYS | BRANCH_IFTRUE :
+		CMD_TX_PKT | BRANCH_IFTRUE;
+#endif
+
+	/* Todo: explicitly flush cache lines here. */
+
+	/* Wake the potentially-idle transmit channel. */
+	outl(0x10001000, dev->base_addr + TxCtrl);
+
+	if (yp->cur_tx - yp->dirty_tx < TX_RING_SIZE - 1)
+		clear_bit(0, (void*)&dev->tbusy);		/* Typical path */
+	else
+		yp->tx_full = 1;
+	dev->trans_start = jiffies;
+
+	if (yellowfin_debug > 4) {
+		printk("%s: Yellowfin transmit frame #%d queued in slot %d.\n",
+			   dev->name, yp->cur_tx, entry);
+	}
+	return 0;
+}
+
+/* The interrupt handler does all of the Rx thread work and cleans up
+   after the Tx thread. */
+static void yellowfin_interrupt IRQ(int irq, void *dev_instance, struct pt_regs *regs)
+{
+#ifdef SA_SHIRQ		/* Use the now-standard shared IRQ implementation. */
+	struct device *dev = (struct device *)dev_instance;
+#else
+	struct device *dev = (struct device *)(irq2dev_map[irq]);
+#endif
+
+	struct yellowfin_private *lp;
+	int ioaddr, boguscnt = max_interrupt_work;
+
+	if (dev == NULL) {
+		printk ("yellowfin_interrupt(): irq %d for unknown device.\n", irq);
+		return;
+	}
+
+	ioaddr = dev->base_addr;
+	lp = (struct yellowfin_private *)dev->priv;
+	if (test_and_set_bit(0, (void*)&lp->in_interrupt)) {
+		dev->interrupt = 1;
+		printk(KERN_ERR "%s: Re-entering the interrupt handler.\n", dev->name);
+		return;
+	}
+
+	do {
+		u16 intr_status = inw(ioaddr + IntrClear);
+		unsigned dirty_tx = lp->dirty_tx;
+
+		if (yellowfin_debug > 4)
+			printk("%s: Yellowfin interrupt, status %4.4x.\n",
+				   dev->name, intr_status);
+
+		if (intr_status == 0)
+			break;
+
+		if (intr_status & (IntrRxDone | IntrEarlyRx))
+			yellowfin_rx(dev);
+
+#ifdef NO_TXSTATS
+		for (; lp->cur_tx - dirty_tx > 0; dirty_tx++) {
+			int entry = dirty_tx % TX_RING_SIZE;
+			if (lp->tx_ring[entry].status == 0)
+				break;
+			/* Free the original skb. */
+			dev_kfree_skb(lp->tx_skbuff[entry], FREE_WRITE);
+			lp->tx_skbuff[entry] = 0;
+			lp->stats.tx_packets++;
+		}
+		if (lp->tx_full && dev->tbusy
+			&& lp->cur_tx - dirty_tx < TX_RING_SIZE - 4) {
+			/* The ring is no longer full, clear tbusy. */
+			lp->tx_full = 0;
+			clear_bit(0, (void*)&dev->tbusy);
+			mark_bh(NET_BH);
+		}
+		lp->dirty_tx = dirty_tx;
+#else
+		if (intr_status & IntrTxDone
+			|| lp->tx_status[dirty_tx % TX_RING_SIZE].tx_errs) {
+
+			for (dirty_tx = lp->dirty_tx; lp->cur_tx - dirty_tx > 0;
+				 dirty_tx++) {
+				/* Todo: optimize this. */
+				int entry = dirty_tx % TX_RING_SIZE;
+				u16 tx_errs = lp->tx_status[entry].tx_errs;
+
+				if (tx_errs == 0)
+					break;			/* It still hasn't been Txed */
+				if (tx_errs & 0xF8100000) {
+					/* There was an major error, log it. */
+#ifndef final_version
+					if (yellowfin_debug > 1)
+						printk("%s: Transmit error, Tx status %4.4x.\n",
+							   dev->name, tx_errs);
+#endif
+					lp->stats.tx_errors++;
+					if (tx_errs & 0xF800) lp->stats.tx_aborted_errors++;
+					if (tx_errs & 0x0800) lp->stats.tx_carrier_errors++;
+					if (tx_errs & 0x2000) lp->stats.tx_window_errors++;
+					if (tx_errs & 0x8000) lp->stats.tx_fifo_errors++;
+#ifdef ETHER_STATS
+					if (tx_errs & 0x1000) lp->stats.collisions16++;
+#endif
+				} else {
+#ifdef ETHER_STATS
+					if (status & 0x0400) lp->stats.tx_deferred++;
+#endif
+					lp->stats.collisions += tx_errs & 15;
+					lp->stats.tx_packets++;
+				}
+
+				/* Free the original skb. */
+				dev_kfree_skb(lp->tx_skbuff[entry], FREE_WRITE);
+				lp->tx_skbuff[entry] = 0;
+				/* Mark status as empty. */
+				lp->tx_status[entry].tx_errs = 0;
+			}
+
+#ifndef final_version
+			if (lp->cur_tx - dirty_tx > TX_RING_SIZE) {
+				printk("%s: Out-of-sync dirty pointer, %d vs. %d, full=%d.\n",
+					   dev->name, dirty_tx, lp->cur_tx, lp->tx_full);
+				dirty_tx += TX_RING_SIZE;
+			}
+#endif
+
+			if (lp->tx_full && dev->tbusy
+				&& lp->cur_tx - dirty_tx < TX_RING_SIZE - 2) {
+				/* The ring is no longer full, clear tbusy. */
+				lp->tx_full = 0;
+				clear_bit(0, (void*)&dev->tbusy);
+				mark_bh(NET_BH);
+			}
+
+			lp->dirty_tx = dirty_tx;
+		}
+#endif
+
+		/* Log errors and other events. */
+		if (intr_status & 0x2ee) {	/* Abnormal error summary. */
+			printk("%s: Something Wicked happened! %4.4x.\n",
+				   dev->name, intr_status);
+			/* Hmmmmm, it's not clear what to do here. */
+			if (intr_status & (IntrTxPCIErr | IntrTxPCIFault))
+				lp->stats.tx_errors++;
+			if (intr_status & (IntrRxPCIErr | IntrRxPCIFault))
+				lp->stats.rx_errors++;
+		}
+		if (--boguscnt < 0) {
+			printk("%s: Too much work at interrupt, status=0x%4.4x.\n",
+				   dev->name, intr_status);
+			break;
+		}
+	} while (1);
+
+	if (yellowfin_debug > 3)
+		printk("%s: exiting interrupt, status=%#4.4x.\n",
+			   dev->name, inw(ioaddr + IntrStatus));
+
+	/* Code that should never be run!  Perhaps remove after testing.. */
+	{
+		static int stopit = 10;
+		if (dev->start == 0  &&  --stopit < 0) {
+			printk("%s: Emergency stop, looping startup interrupt.\n",
+				   dev->name);
+#ifdef SA_SHIRQ
+			free_irq(irq, dev);
+#else
+			free_irq(irq);
+#endif
+		}
+	}
+
+	dev->interrupt = 0;
+	clear_bit(0, (void*)&lp->in_interrupt);
+	return;
+}
+
+/* This routine is logically part of the interrupt handler, but separated
+   for clarity and better register allocation. */
+static int
+yellowfin_rx(struct device *dev)
+{
+	struct yellowfin_private *lp = (struct yellowfin_private *)dev->priv;
+	struct yellowfin_private *yp = (struct yellowfin_private *)dev->priv;
+	int entry = lp->cur_rx % RX_RING_SIZE;
+	int boguscnt = 20;
+
+	if (yellowfin_debug > 4) {
+		printk(" In yellowfin_rx(), entry %d status %4.4x.\n", entry,
+			   yp->rx_ring[entry].status);
+		printk("   #%d desc. %4.4x %4.4x %8.8x %4.4x %4.4x.\n",
+			   entry, yp->rx_ring[entry].cmd,
+			   yp->rx_ring[entry].request_cnt, yp->rx_ring[entry].addr,
+			   yp->rx_ring[entry].result_cnt, yp->rx_ring[entry].status);
+	}
+
+
+	/* If EOP is set on the next entry, it's a new packet. Send it up. */
+	while (yp->rx_ring[entry].status) {
+		/* Todo: optimize this mess. */
+		u16 desc_status = yp->rx_ring[entry].status;
+		struct yellowfin_desc *desc = &lp->rx_ring[entry];
+		int frm_size = desc->request_cnt - desc->result_cnt;
+		u8 *buf_addr = bus_to_virt(lp->rx_ring[entry].addr);
+		s16 frame_status = *(s16*)&(buf_addr[frm_size - 2]);
+
+		if (yellowfin_debug > 4)
+			printk("  yellowfin_rx() status was %4.4x.\n", frame_status);
+		if (--boguscnt < 0)
+			break;
+		if ( ! (desc_status & RX_EOP)) {
+			printk("%s: Oversized Ethernet frame spanned multiple buffers,"
+				   " status %4.4x!\n", dev->name, desc_status);
+			  lp->stats.rx_length_errors++;
+		} else if (frame_status & 0x0038) {
+			/* There was a error. */
+			if (yellowfin_debug > 3)
+				printk("  yellowfin_rx() Rx error was %4.4x.\n", frame_status);
+			lp->stats.rx_errors++;
+			if (frame_status & 0x0060) lp->stats.rx_length_errors++;
+			if (frame_status & 0x0008) lp->stats.rx_frame_errors++;
+			if (frame_status & 0x0010) lp->stats.rx_crc_errors++;
+			if (frame_status < 0) lp->stats.rx_dropped++;
+#ifdef YF_PROTOTYPE			/* Support for prototype hardware errata. */
+		} else if (memcmp(bus_to_virt(lp->rx_ring[entry].addr),
+						  dev->dev_addr, 6) != 0
+				   && memcmp(bus_to_virt(lp->rx_ring[entry].addr),
+							 "\377\377\377\377\377\377", 6) != 0) {
+			printk("%s: Bad frame to %2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x.\n",
+				   dev->name,
+				   ((char *)bus_to_virt(lp->rx_ring[entry].addr))[0],
+				   ((char *)bus_to_virt(lp->rx_ring[entry].addr))[1],
+				   ((char *)bus_to_virt(lp->rx_ring[entry].addr))[2],
+				   ((char *)bus_to_virt(lp->rx_ring[entry].addr))[3],
+				   ((char *)bus_to_virt(lp->rx_ring[entry].addr))[4],
+				   ((char *)bus_to_virt(lp->rx_ring[entry].addr))[5]);
+			bogus_rx++;
+#endif
+		} else {
+			u8 bogus_cnt = buf_addr[frm_size - 8];
+			int pkt_len = frm_size - 8 - bogus_cnt;
+			struct sk_buff *skb;
+			int rx_in_place = 0;
+
+			/* Check if the packet is long enough to just accept without
+			   copying to a properly sized skbuff. */
+			if (pkt_len > rx_copybreak) {
+				struct sk_buff *newskb;
+				char *temp;
+
+				/* Get a fresh skbuff to replace the filled one. */
+				newskb = DEV_ALLOC_SKB(dev->mtu <= 1500 ? PKT_BUF_SZ
+									   : dev->mtu + 32);
+				if (newskb == NULL) {
+					skb = 0;		/* No memory, drop the packet. */
+					goto memory_squeeze;
+				}
+				/* Pass up the skb already on the Rx ring. */
+				skb = lp->rx_skbuff[entry];
+				temp = skb_put(skb, pkt_len);
+				if (bus_to_virt(lp->rx_ring[entry].addr) != temp)
+					printk("%s: Warning -- the skbuff addresses do not match"
+						   " in yellowfin_rx: %p vs. %p / %p.\n", dev->name,
+						   bus_to_virt(lp->rx_ring[entry].addr),
+						   skb->head, temp);
+				rx_in_place = 1;
+				lp->rx_skbuff[entry] = newskb;
+				newskb->dev = dev;
+				skb_reserve(newskb, 2);	/* 16 byte align IP header */
+				lp->rx_ring[entry].addr = virt_to_bus(newskb->tail);
+			} else
+				skb = DEV_ALLOC_SKB(pkt_len + 2);
+			memory_squeeze:
+			if (skb == NULL) {
+				printk("%s: Memory squeeze, deferring packet.\n", dev->name);
+				/* todo: Check that at least two ring entries are free.
+				   If not, free one and mark stats->rx_dropped++. */
+				break;
+			}
+			skb->dev = dev;
+			if (! rx_in_place) {
+				skb_reserve(skb, 2);	/* 16 byte align the data fields */
+				memcpy(skb_put(skb, pkt_len),
+					   bus_to_virt(lp->rx_ring[entry].addr), pkt_len);
+			}
+#if LINUX_VERSION_CODE > 0x10300
+			skb->protocol = eth_type_trans(skb, dev);
+#else
+			skb->len = pkt_len;
+#endif
+			netif_rx(skb);
+			lp->stats.rx_packets++;
+		}
+
+		/* Mark this entry as being the end-of-list, and the prior entry
+		   as now valid. */
+		lp->rx_ring[entry].cmd = CMD_STOP;
+		yp->rx_ring[entry].status = 0;
+		{
+			int prev_entry = entry - 1;
+			if (prev_entry < 0)
+				lp->rx_ring[RX_RING_SIZE - 1].cmd =
+					CMD_RX_BUF | INTR_ALWAYS | BRANCH_ALWAYS;
+			else
+				lp->rx_ring[prev_entry].cmd = CMD_RX_BUF | INTR_ALWAYS;
+		}
+		entry = (++lp->cur_rx) % RX_RING_SIZE;
+	}
+	/* todo: restart Rx engine if stopped.  For now we just make the Rx ring
+	   large enough to avoid this. */
+
+	return 0;
+}
+
+static int
+yellowfin_close(struct device *dev)
+{
+	int ioaddr = dev->base_addr;
+	struct yellowfin_private *yp = (struct yellowfin_private *)dev->priv;
+	int i;
+
+	dev->start = 0;
+	dev->tbusy = 1;
+
+	if (yellowfin_debug > 1) {
+		printk("%s: Shutting down ethercard, status was Tx %4.4x Rx %4.4x Int %2.2x.\n",
+			   dev->name, inw(ioaddr + TxStatus),
+			   inw(ioaddr + RxStatus), inl(ioaddr + IntrStatus));
+		printk("%s: Queue pointers were Tx %d / %d,  Rx %d / %d.\n",
+			   dev->name, yp->cur_tx, yp->dirty_tx, yp->cur_rx, yp->dirty_rx);
+	}
+
+	/* Disable interrupts by clearing the interrupt mask. */
+	outw(0x0000, ioaddr + IntrEnb);
+
+	/* Stop the chip's Tx and Rx processes. */
+	outl(0x80000000, ioaddr + RxCtrl);
+	outl(0x80000000, ioaddr + TxCtrl);
+
+	del_timer(&yp->timer);
+
+#ifdef __i386__
+	if (yellowfin_debug > 2) {
+		printk("\n  Tx ring at %8.8x:\n", (int)virt_to_bus(yp->tx_ring));
+		for (i = 0; i < TX_RING_SIZE*2; i++)
+			printk(" %c #%d desc. %4.4x %4.4x %8.8x %8.8x %4.4x %4.4x.\n",
+				   inl(ioaddr + TxPtr) == (long)&yp->tx_ring[i] ? '>' : ' ',
+				   i, yp->tx_ring[i].cmd,
+				   yp->tx_ring[i].request_cnt, yp->tx_ring[i].addr,
+				   yp->tx_ring[i].branch_addr,
+				   yp->tx_ring[i].result_cnt, yp->tx_ring[i].status);
+		printk("  Tx status %p:\n", yp->tx_status);
+		for (i = 0; i < TX_RING_SIZE; i++)
+			printk("   #%d status %4.4x %4.4x %4.4x %4.4x.\n",
+				   i, yp->tx_status[i].tx_cnt, yp->tx_status[i].tx_errs,
+				   yp->tx_status[i].total_tx_cnt, yp->tx_status[i].paused);
+
+		printk("\n  Rx ring %8.8x:\n", (int)virt_to_bus(yp->rx_ring));
+		for (i = 0; i < RX_RING_SIZE; i++) {
+			printk(" %c #%d desc. %4.4x %4.4x %8.8x %4.4x %4.4x\n",
+				   inl(ioaddr + RxPtr) == (long)&yp->rx_ring[i] ? '>' : ' ',
+				   i, yp->rx_ring[i].cmd,
+				   yp->rx_ring[i].request_cnt, yp->rx_ring[i].addr,
+				   yp->rx_ring[i].result_cnt, yp->rx_ring[i].status);
+			if (yellowfin_debug > 5) {
+				if (*(u8*)yp->rx_ring[i].addr != 0x69) {
+					int j;
+					for (j = 0; j < 0x50; j++)
+						printk(" %4.4x", ((u16*)yp->rx_ring[i].addr)[j]);
+					printk("\n");
+				}
+			}
+		}
+	}
+#endif /* __i386__ debugging only */
+
+#ifdef SA_SHIRQ
+	free_irq(dev->irq, dev);
+#else
+	free_irq(dev->irq);
+	irq2dev_map[dev->irq] = 0;
+#endif
+
+	/* Free all the skbuffs in the Rx queue. */
+	for (i = 0; i < RX_RING_SIZE; i++) {
+		yp->rx_ring[i].cmd = CMD_STOP;
+		yp->rx_ring[i].addr = 0xBADF00D0; /* An invalid address. */
+		if (yp->rx_skbuff[i]) {
+#if LINUX_VERSION_CODE < 0x20100
+			yp->rx_skbuff[i]->free = 1;
+#endif
+			dev_kfree_skb(yp->rx_skbuff[i], FREE_WRITE);
+		}
+		yp->rx_skbuff[i] = 0;
+	}
+	for (i = 0; i < TX_RING_SIZE; i++) {
+		if (yp->tx_skbuff[i])
+			dev_kfree_skb(yp->tx_skbuff[i], FREE_WRITE);
+		yp->tx_skbuff[i] = 0;
+	}
+
+#ifdef YF_PROTOTYPE			/* Support for prototype hardware errata. */
+	if (yellowfin_debug > 0) {
+		printk("%s: Received %d frames that we should not have.\n",
+			   dev->name, bogus_rx);
+	}
+#endif
+	MOD_DEC_USE_COUNT;
+
+	return 0;
+}
+
+static struct enet_statistics *
+yellowfin_get_stats(struct device *dev)
+{
+	struct yellowfin_private *yp = (struct yellowfin_private *)dev->priv;
+	return &yp->stats;
+}
+
+/* Set or clear the multicast filter for this adaptor. */
+
+/* The little-endian AUTODIN32 ethernet CRC calculation.
+   N.B. Do not use for bulk data, use a table-based routine instead.
+   This is common code and should be moved to net/core/crc.c */
+static unsigned const ethernet_polynomial_le = 0xedb88320U;
+static inline unsigned ether_crc_le(int length, unsigned char *data)
+{
+	unsigned int crc = 0xffffffff;	/* Initial value. */
+	while(--length >= 0) {
+		unsigned char current_octet = *data++;
+		int bit;
+		for (bit = 8; --bit >= 0; current_octet >>= 1) {
+			if ((crc ^ current_octet) & 1) {
+				crc >>= 1;
+				crc ^= ethernet_polynomial_le;
+			} else
+				crc >>= 1;
+		}
+	}
+	return crc;
+}
+
+
+#ifdef NEW_MULTICAST
+static void set_rx_mode(struct device *dev)
+#else
+static void set_rx_mode(struct device *dev, int num_addrs, void *addrs);
+#endif
+{
+	int ioaddr = dev->base_addr;
+	u16 cfg_value = inw(ioaddr + Cnfg);
+
+	/* Stop the Rx process to change any value. */
+	outw(cfg_value & ~0x1000, ioaddr + Cnfg);
+	if (dev->flags & IFF_PROMISC) {			/* Set promiscuous. */
+		/* Unconditionally log net taps. */
+		printk("%s: Promiscuous mode enabled.\n", dev->name);
+		outw(0x000F, ioaddr + AddrMode);
+	} else if ((dev->mc_count > 64)  ||  (dev->flags & IFF_ALLMULTI)) {
+		/* Too many to filter well, or accept all multicasts. */
+		outw(0x000B, ioaddr + AddrMode);
+	} else if (dev->mc_count > 0) { /* Must use the multicast hash table. */
+		struct dev_mc_list *mclist;
+		u16 hash_table[4];
+		int i;
+		memset(hash_table, 0, sizeof(hash_table));
+		for (i = 0, mclist = dev->mc_list; mclist && i < dev->mc_count;
+			 i++, mclist = mclist->next) {
+			/* Due to a bug in the early chip versions, multiple filter
+			   slots must be set for each address. */
+			set_bit((ether_crc_le(3, mclist->dmi_addr) >> 3) & 0x3f,
+					hash_table);
+			set_bit((ether_crc_le(4, mclist->dmi_addr) >> 3) & 0x3f,
+					hash_table);
+			set_bit((ether_crc_le(5, mclist->dmi_addr) >> 3) & 0x3f,
+					hash_table);
+			set_bit((ether_crc_le(6, mclist->dmi_addr) >> 3) & 0x3f,
+					hash_table);
+		}
+		/* Copy the hash table to the chip. */
+		for (i = 0; i < 4; i++)
+			outw(hash_table[i], ioaddr + HashTbl + i*2);
+		outw(0x0003, ioaddr + AddrMode);
+	} else {					/* Normal, unicast/broadcast-only mode. */
+		outw(0x0001, ioaddr + AddrMode);
+	}
+	/* Restart the Rx process. */
+	outw(cfg_value | 0x1000, ioaddr + Cnfg);
+}
+
+#ifdef MODULE
+
+/* An additional parameter that may be passed in... */
+static int debug = -1;
+
+int
+init_module(void)
+{
+	int cards_found;
+
+	if (debug >= 0)
+		yellowfin_debug = debug;
+
+	root_yellowfin_dev = NULL;
+	cards_found = yellowfin_probe(0);
+
+	return cards_found ? 0 : -ENODEV;
+}
+
+void
+cleanup_module(void)
+{
+	struct device *next_dev;
+
+	/* No need to check MOD_IN_USE, as sys_delete_module() checks. */
+	while (root_yellowfin_dev) {
+		next_dev = ((struct yellowfin_private *)root_yellowfin_dev->priv)->next_module;
+		unregister_netdev(root_yellowfin_dev);
+		release_region(root_yellowfin_dev->base_addr, YELLOWFIN_TOTAL_SIZE);
+		kfree(root_yellowfin_dev);
+		root_yellowfin_dev = next_dev;
+	}
+}
+
+#endif  /* MODULE */
+
+/*
+ * Local variables:
+ *  compile-command: "gcc -DMODULE -D__KERNEL__ -I/usr/src/linux/net/inet -Wall -Wstrict-prototypes -O6 -c yellowfin.c `[ -f /usr/include/linux/modversions.h ] && echo -DMODVERSIONS`"
+ *  SMP-compile-command: "gcc -D__SMP__ -DMODULE -D__KERNEL__ -I/usr/src/linux/net/inet -Wall -Wstrict-prototypes -O6 -c yellowfin.c `[ -f /usr/include/linux/modversions.h ] && echo -DMODVERSIONS`"
+ *  c-indent-level: 4
+ *  c-basic-offset: 4
+ *  tab-width: 4
+ * End:
+ */