patch-2.1.107 linux/drivers/net/sktr.c

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diff -u --recursive --new-file v2.1.106/linux/drivers/net/sktr.c linux/drivers/net/sktr.c
@@ -0,0 +1,2696 @@
+/*
+ *  sktr.c: A network driver for the SysKonnect Token Ring ISA/PCI Adapters.
+ *
+ *  Written 1997 by Christoph Goos
+ *
+ *  A fine result of the Linux Systems Network Architecture Project.
+ *  http://samba.anu.edu.au/linux-sna/
+ *
+ *  This software may be used and distributed according to the terms
+ *  of the GNU Public License, incorporated herein by reference.
+ *
+ *  This device driver works with the following SysKonnect adapters:
+ *	- SysKonnect TR4/16(+) ISA	(SK-4190)
+ *	- SysKonnect TR4/16(+) PCI	(SK-4590)
+ *	- SysKonnect TR4/16 PCI		(SK-4591)
+ *
+ *  Sources:
+ *  	- The hardware related parts of this driver are take from
+ *  	  the SysKonnect Token Ring driver for Windows NT.
+ *  	- I used the IBM Token Ring driver 'ibmtr.c' as a base for this
+ *  	  driver, as well as the 'skeleton.c' driver by Donald Becker.
+ *  	- Also various other drivers in the linux source tree were taken
+ *  	  as samples for some tasks.
+ *
+ *  Maintainer(s):
+ *    JS        Jay Schulist            jschlst@samba.anu.edu.au
+ *    CG	Christoph Goos		cgoos@syskonnect.de
+ *
+ *  Modification History:
+ *	29-Aug-97	CG	Created
+ *	04-Apr-98	CG	Fixed problems caused by tok_timer_check
+ *	10-Apr-98	CG	Fixed lockups at cable disconnection
+ *	27-May-98	JS	Formated to Linux Kernel Format
+ *	31-May-98	JS	Hacked in PCI support
+ *	16-Jun-98	JS	Modulized for multiple cards with one driver
+ *
+ *  To do:
+ *    1. Selectable 16 Mbps or 4Mbps
+ *    2. Multi/Broadcast packet handling
+ *
+ */
+
+static const char *version = "sktr.c: v1.01 08/29/97 by Christoph Goos\n";
+
+#include <linux/config.h>
+#ifdef MODULE
+#include <linux/module.h>
+#include <linux/version.h>
+#endif
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/interrupt.h>
+#include <linux/ptrace.h>
+#include <linux/ioport.h>
+#include <linux/in.h>
+#include <linux/malloc.h>
+#include <linux/string.h>
+#include <linux/time.h>
+#include <asm/system.h>
+#include <asm/bitops.h>
+#include <asm/io.h>
+#include <asm/dma.h>
+#include <asm/irq.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/trdevice.h>
+
+#include "sktr.h"		/* Our Stuff */
+#include "sktr_firmware.h"	/* SysKonnect adapter firmware */
+
+/* A zero-terminated list of I/O addresses to be probed. */
+static unsigned int sktr_portlist[] __initdata = {
+	0x0A20, 0x1A20, 0x0B20, 0x1B20, 0x0980, 0x1980, 0x0900, 0x1900,
+	0
+};
+
+/* A zero-terminated list of IRQs to be probed. 
+ * Used again after initial probe for sktr_chipset_init, called from sktr_open.
+ */
+static unsigned short sktr_irqlist[] = {
+	3, 5, 9, 10, 11, 12, 15,
+	0
+};
+
+/* A zero-terminated list of DMAs to be probed. */
+static int sktr_dmalist[] __initdata = {
+	5, 6, 7,
+	0
+};
+
+/* Card names */
+static char *pci_cardname = "SK NET TR 4/16 PCI\0";
+static char *isa_cardname = "SK NET TR 4/16 ISA\0";
+static char *AdapterName;
+
+/* Use 0 for production, 1 for verification, 2 for debug, and
+ * 3 for very verbose debug.
+ */
+#ifndef SKTR_DEBUG
+#define SKTR_DEBUG 1
+#endif
+static unsigned int sktr_debug = SKTR_DEBUG;
+
+/* The number of low I/O ports used by the tokencard. */
+#define SKTR_IO_EXTENT 32
+
+/* Index to functions, as function prototypes.
+ * Alphabetical by function name.
+ */
+
+/* "B" */
+static int      sktr_bringup_diags(struct device *dev);
+/* "C" */
+static void	sktr_cancel_tx_queue(struct net_local* tp);
+static int 	sktr_chipset_init(struct device *dev);
+static void 	sktr_chk_irq(struct device *dev);
+static unsigned char sktr_chk_frame(struct device *dev, unsigned char *Addr);
+static void 	sktr_chk_outstanding_cmds(struct device *dev);
+static void 	sktr_chk_src_addr(unsigned char *frame, unsigned char *hw_addr);
+static unsigned char sktr_chk_ssb(struct net_local *tp, unsigned short IrqType);
+static int 	sktr_close(struct device *dev);
+static void 	sktr_cmd_status_irq(struct device *dev);
+/* "D" */
+static void 	sktr_disable_interrupts(struct device *dev);
+static void 	sktr_dump(unsigned char *Data, int length);
+/* "E" */
+static void 	sktr_enable_interrupts(struct device *dev);
+static void 	sktr_exec_cmd(struct device *dev, unsigned short Command);
+static void 	sktr_exec_sifcmd(struct device *dev, unsigned int WriteValue);
+/* "F" */
+static unsigned char *sktr_fix_srouting(unsigned char *buf, short *FrameLen);
+/* "G" */
+static struct enet_statistics *sktr_get_stats(struct device *dev);
+/* "H" */
+static void 	sktr_hardware_send_packet(struct device *dev,
+			struct net_local* tp);
+/* "I" */
+static int 	sktr_init_adapter(struct device *dev);
+static int 	sktr_init_card(struct device *dev);
+static void 	sktr_init_ipb(struct net_local *tp);
+static void 	sktr_init_net_local(struct device *dev);
+static void 	sktr_init_opb(struct net_local *tp);
+static void 	sktr_interrupt(int irq, void *dev_id, struct pt_regs *regs);
+static int 	sktr_isa_chk_card(struct device *dev, int ioaddr);
+static int      sktr_isa_chk_ioaddr(int ioaddr);
+/* "O" */
+static int 	sktr_open(struct device *dev);
+static void	sktr_open_adapter(struct device *dev);
+/* "P" */
+static int 	sktr_pci_chk_card(struct device *dev);
+int 		sktr_probe(struct device *dev);
+static int 	sktr_probe1(struct device *dev, int ioaddr);
+/* "R" */
+static void 	sktr_rcv_status_irq(struct device *dev);
+static void 	sktr_read_addr(struct device *dev, unsigned char *Address);
+static void 	sktr_read_ptr(struct device *dev);
+static void 	sktr_read_ram(struct device *dev, unsigned char *Data,
+			unsigned short Address, int Length);
+static int 	sktr_reset_adapter(struct device *dev);
+static void 	sktr_reset_interrupt(struct device *dev);
+static void 	sktr_ring_status_irq(struct device *dev);
+/* "S" */
+static int 	sktr_send_packet(struct sk_buff *skb, struct device *dev);
+static void 	sktr_set_multicast_list(struct device *dev);
+/* "T" */
+static void 	sktr_timer_chk(unsigned long data);
+static void 	sktr_timer_end_wait(unsigned long data);
+static void 	sktr_tx_status_irq(struct device *dev);
+/* "U" */
+static void 	sktr_update_rcv_stats(struct net_local *tp,
+			unsigned char DataPtr[], unsigned int Length);
+/* "W" */
+static void 	sktr_wait(unsigned long time);
+static void 	sktr_write_rpl_status(RPL *rpl, unsigned int Status);
+static void 	sktr_write_tpl_status(TPL *tpl, unsigned int Status);
+
+/*
+ * Check for a network adapter of this type, and return '0' if one exists.
+ * If dev->base_addr == 0, probe all likely locations.
+ * If dev->base_addr == 1, always return failure.
+ */
+__initfunc(int sktr_probe(struct device *dev))
+{
+	int i;
+	int base_addr = dev ? dev->base_addr : 0;
+
+	if(base_addr > 0x1ff)    /* Check a single specified location. */
+		return (sktr_probe1(dev, base_addr));
+	else if(base_addr != 0)  /* Don't probe at all. */
+		return (-ENXIO);
+
+	for(i = 0; sktr_portlist[i]; i++)
+	{
+		int ioaddr = sktr_portlist[i];
+		if(check_region(ioaddr, SKTR_IO_EXTENT))
+			continue;
+		if(sktr_probe1(dev, ioaddr))
+		{
+#ifndef MODULE
+                        tr_freedev(dev);
+#endif
+                }
+		else
+			return (0);
+	}
+
+	return (-ENODEV);
+}
+
+/*
+ * Detect and setup the PCI SysKonnect TR cards in slot order.
+ */
+__initfunc(static int sktr_pci_chk_card(struct device *dev))
+{
+	static int pci_index = 0;
+	unsigned char pci_bus, pci_device_fn;
+
+	if(!pci_present())
+		return (-1);	/* No PCI present. */
+
+	for(; pci_index < 0xff; pci_index++)
+	{
+		unsigned int pci_irq_line;
+		struct pci_dev *pdev;
+		unsigned short pci_command, new_command, vendor, device;
+		unsigned int pci_ioaddr;
+
+		if(pcibios_find_class(PCI_CLASS_NETWORK_TOKEN_RING << 8,
+			pci_index, &pci_bus, &pci_device_fn)
+			!= PCIBIOS_SUCCESSFUL)
+		{
+			break;
+		}
+
+		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);
+
+		pdev		= pci_find_slot(pci_bus, pci_device_fn);
+		pci_irq_line 	= pdev->irq;
+		pci_ioaddr 	= pdev->base_address[0];
+
+		pcibios_read_config_word(pci_bus, pci_device_fn,
+						PCI_COMMAND, &pci_command);
+
+		/* Remove I/O space marker in bit 0. */
+		pci_ioaddr &= ~3;
+
+		if(vendor != PCI_VENDOR_ID_SK)
+			continue;
+		if(device != PCI_DEVICE_ID_SK_TR)
+			continue;
+		if(check_region(pci_ioaddr, SKTR_IO_EXTENT))
+			continue;
+		request_region(pci_ioaddr, SKTR_IO_EXTENT, pci_cardname);
+		if(request_irq(pdev->irq, sktr_interrupt, SA_SHIRQ,
+				pci_cardname, dev))
+			return (-ENODEV); /* continue; ?? */
+
+		AdapterName = pci_cardname;
+
+		new_command = (pci_command|PCI_COMMAND_MASTER|PCI_COMMAND_IO);
+
+		if(pci_command != new_command)
+		{
+			printk("The PCI BIOS has not enabled this"
+				"device! Updating PCI command %4.4x->%4.4x.\n",
+			  	pci_command, new_command);
+			pcibios_write_config_word(pci_bus, pci_device_fn,
+				PCI_COMMAND, new_command);
+		}
+
+		/* At this point we have found a valid PCI TR card. */
+		dev->base_addr	= pci_ioaddr;
+		dev->irq 	= pci_irq_line;
+		dev->dma	= 0;
+
+		printk("%s: %s found at %#4x, using IRQ %d.\n",
+			dev->name, AdapterName, pci_ioaddr, dev->irq);
+
+		return (0);
+	}
+
+	return (-1);
+}
+
+/*
+ * Detect and setup the ISA SysKonnect TR cards.
+ */
+__initfunc(static int sktr_isa_chk_card(struct device *dev, int ioaddr))
+{
+	int i, err;
+
+	err = sktr_isa_chk_ioaddr(ioaddr);
+	if(err < 0)
+		return (-ENODEV);
+
+        if(virt_to_bus((void*)((unsigned long)dev->priv+sizeof(struct net_local)))
+		> ISA_MAX_ADDRESS)
+        {
+                printk("%s: Memory not accessible for DMA\n", dev->name);
+                kfree(dev->priv);
+                return (-EAGAIN);
+        }
+
+	AdapterName = isa_cardname;
+
+        /* Grab the region so that no one else tries to probe our ioports. */
+        request_region(ioaddr, SKTR_IO_EXTENT, AdapterName);
+        dev->base_addr = ioaddr;
+
+        /* Autoselect IRQ and DMA if dev->irq == 0 */
+        if(dev->irq == 0)
+        {
+                for(i = 0; sktr_irqlist[i] != 0; i++)
+                {
+                        dev->irq = sktr_irqlist[i];
+                        err = request_irq(dev->irq, &sktr_interrupt, 0, AdapterName, dev);
+                        if(!err)
+				break;
+                }
+
+                if(sktr_irqlist[i] == 0)
+                {
+                        printk("%s: AutoSelect no IRQ available\n", dev->name);
+                        return (-EAGAIN);
+                }
+        }
+        else
+        {
+                err = request_irq(dev->irq, &sktr_interrupt, 0, AdapterName, dev);
+		if(err)
+                {
+                        printk("%s: Selected IRQ not available\n", dev->name);
+                        return (-EAGAIN);
+                }
+        }
+
+        /* Always allocate the DMA channel after IRQ and clean up on failure */
+        if(dev->dma == 0)
+        {
+                for(i = 0; sktr_dmalist[i] != 0; i++)
+                {
+			dev->dma = sktr_dmalist[i];
+                        err = request_dma(dev->dma, AdapterName);
+                        if(!err)
+                                break;
+                }
+
+                if(dev->dma == 0)
+                {
+                        printk("%s: AutoSelect no DMA available\n", dev->name);
+                        free_irq(dev->irq, NULL);
+                        return (-EAGAIN);
+                }
+        }
+        else
+        {
+                err = request_dma(dev->dma, AdapterName);
+                if(err)
+                {
+                        printk("%s: Selected DMA not available\n", dev->name);
+                        free_irq(dev->irq, NULL);
+                        return (-EAGAIN);
+                }
+        }
+
+	disable_dma(dev->dma);
+        set_dma_mode(dev->dma, DMA_MODE_CASCADE);
+        enable_dma(dev->dma);
+
+	printk("%s: %s found at %#4x, using IRQ %d and DMA %d.\n",
+                dev->name, AdapterName, ioaddr, dev->irq, dev->dma);
+
+	return (0);
+}
+
+__initfunc(static int sktr_probe1(struct device *dev, int ioaddr))
+{
+	static unsigned version_printed = 0;
+	struct net_local *tp;
+	int err;
+
+	if(sktr_debug && version_printed++ == 0)
+		printk("%s", version);
+
+#ifndef MODULE
+	dev = init_trdev(dev, 0);
+	if(dev == NULL)
+		return (-ENOMEM);
+#endif
+
+	err = sktr_pci_chk_card(dev);
+	if(err < 0)
+	{
+		err = sktr_isa_chk_card(dev, ioaddr);
+		if(err < 0)
+			return (-ENODEV);
+	}
+
+	/* Setup this devices private information structure */
+	tp = (struct net_local *)kmalloc(sizeof(struct net_local), GFP_KERNEL | GFP_DMA);
+	if(tp == NULL)
+		return (-ENOMEM);
+	memset(tp, 0, sizeof(struct net_local));
+
+	dev->priv		= tp;
+	dev->init               = sktr_init_card;
+        dev->open               = sktr_open;
+        dev->stop               = sktr_close;
+        dev->hard_start_xmit    = sktr_send_packet;
+        dev->get_stats          = sktr_get_stats;
+        dev->set_multicast_list = &sktr_set_multicast_list;
+
+        return (0);
+}
+
+/* Dummy function */
+__initfunc(static int sktr_init_card(struct device *dev))
+{
+	if(sktr_debug > 3)
+		printk("%s: sktr_init_card\n", dev->name);
+
+	return (0);
+}
+
+/*
+ * This function tests if an adapter is really installed at the
+ * given I/O address. Return negative if no adapter at IO addr.
+ */
+__initfunc(static int sktr_isa_chk_ioaddr(int ioaddr))
+{
+	unsigned char old, chk1, chk2;
+
+	old = inb(ioaddr + SIFADR);	/* Get the old SIFADR value */
+
+	chk1 = 0;	/* Begin with check value 0 */
+	do {
+		/* Write new SIFADR value */
+		outb(chk1, ioaddr + SIFADR);
+
+		/* Read, invert and write */
+		chk2 = inb(ioaddr + SIFADD);
+		chk2 ^= 0x0FE;
+		outb(chk2, ioaddr + SIFADR);
+
+		/* Read, invert and compare */
+		chk2 = inb(ioaddr + SIFADD);
+		chk2 ^= 0x0FE;
+
+		if(chk1 != chk2)
+			return (-1);	/* No adapter */
+
+		chk1 -= 2;
+	} while(chk1 != 0);	/* Repeat 128 times (all byte values) */
+
+    	/* Restore the SIFADR value */
+	outb(old, ioaddr + SIFADR);
+
+	return (0);
+}
+
+/*
+ * Open/initialize the board. This is called sometime after
+ * booting when the 'ifconfig' program is run.
+ *
+ * This routine should set everything up anew at each open, even
+ * registers that "should" only need to be set once at boot, so that
+ * there is non-reboot way to recover if something goes wrong.
+ */
+static int sktr_open(struct device *dev)
+{
+	struct net_local *tp = (struct net_local *)dev->priv;
+	int err;
+
+	/* Reset the hardware here. Don't forget to set the station address. */
+	err = sktr_chipset_init(dev);
+	if(err)
+	{
+		printk(KERN_INFO "%s: Chipset initialization error\n", 
+			dev->name);
+		return (-1);
+	}
+
+	dev->addr_len = 6;
+	sktr_read_addr(dev, (unsigned char*)dev->dev_addr);
+
+	init_timer(&tp->timer);
+	tp->timer.expires	= jiffies + 30*HZ;
+	tp->timer.function	= sktr_timer_end_wait;
+	tp->timer.data		= (unsigned long)dev;
+	tp->timer.next		= NULL;
+	tp->timer.prev		= NULL;
+	add_timer(&tp->timer);
+
+	sktr_read_ptr(dev);
+	sktr_enable_interrupts(dev);
+	sktr_open_adapter(dev);
+
+	dev->tbusy = 0;
+	dev->interrupt = 0;
+	dev->start = 0;
+
+	/* Wait for interrupt from hardware. If interrupt does not come,
+	 * there will be a timeout from the timer.
+	 */
+	tp->Sleeping = 1;
+	interruptible_sleep_on(&tp->wait_for_tok_int);
+	del_timer(&tp->timer);
+
+	/* If AdapterVirtOpenFlag is 1, the adapter is now open for use */
+	if(tp->AdapterVirtOpenFlag == 0)
+	{
+		sktr_disable_interrupts(dev);
+		return (-1);
+	}
+
+	dev->start = 1;
+
+	tp->StartTime = jiffies;
+
+	/* Start function control timer */
+	tp->timer.expires	= jiffies + 2*HZ;
+	tp->timer.function	= sktr_timer_chk;
+	tp->timer.data		= (unsigned long)dev;
+	add_timer(&tp->timer);
+
+#ifdef MODULE
+	MOD_INC_USE_COUNT;
+#endif
+
+	return (0);
+}
+
+/*
+ * Timeout function while waiting for event
+ */
+static void sktr_timer_end_wait(unsigned long data)
+{
+	struct device *dev = (struct device*)data;
+	struct net_local *tp = (struct net_local *)dev->priv;
+
+	if(tp->Sleeping)
+	{
+		tp->Sleeping = 0;
+		wake_up_interruptible(&tp->wait_for_tok_int);
+	}
+
+	return;
+}
+
+/*
+ * Initialize the chipset
+ */
+static int sktr_chipset_init(struct device *dev)
+{
+	struct net_local *tp = (struct net_local *)dev->priv;
+	unsigned char PosReg, Tmp;
+	int i, err;
+
+	sktr_init_ipb(tp);
+	sktr_init_opb(tp);
+	sktr_init_net_local(dev);
+
+	/* Set pos register: selects irq and dma channel.
+	 * Only for ISA bus adapters.
+	 */
+	if(dev->dma > 0)
+	{
+		PosReg = 0;
+		for(i = 0; sktr_irqlist[i] != 0; i++)
+		{
+			if(sktr_irqlist[i] == dev->irq)
+				break;
+		}
+
+		/* Choose default cycle time, 500 nsec   */
+		PosReg |= CYCLE_TIME << 2;
+		PosReg |= i << 4;
+		i = dev->dma - 5;
+		PosReg |= i;
+
+		if(tp->DataRate == SPEED_4)
+			PosReg |= LINE_SPEED_BIT;
+		else
+			PosReg &= ~LINE_SPEED_BIT;
+
+		outb(PosReg, dev->base_addr + POSREG);
+		Tmp = inb(dev->base_addr + POSREG);
+		if((Tmp & ~CYCLE_TIME) != (PosReg & ~CYCLE_TIME))
+			printk(KERN_INFO "%s: POSREG error\n", dev->name);
+	}
+
+	err = sktr_reset_adapter(dev);
+	if(err < 0)
+		return (-1);
+
+	err = sktr_bringup_diags(dev);
+	if(err < 0)
+		return (-1);
+
+	err = sktr_init_adapter(dev);
+	if(err < 0)
+		return (-1);
+
+	return (0);
+}
+
+/*
+ * Initializes the net_local structure.
+ */
+static void sktr_init_net_local(struct device *dev)
+{
+	struct net_local *tp = (struct net_local *)dev->priv;
+	int i;
+
+	tp->scb.CMD	= 0;
+	tp->scb.Parm[0] = 0;
+	tp->scb.Parm[1] = 0;
+
+	tp->ssb.STS	= 0;
+	tp->ssb.Parm[0] = 0;
+	tp->ssb.Parm[1] = 0;
+	tp->ssb.Parm[2] = 0;
+
+	tp->CMDqueue	= 0;
+
+	tp->AdapterOpenFlag	= 0;
+	tp->AdapterVirtOpenFlag = 0;
+	tp->ScbInUse		= 0;
+	tp->OpenCommandIssued	= 0;
+	tp->ReOpenInProgress	= 0;
+	tp->HaltInProgress	= 0;
+	tp->TransmitHaltScheduled = 0;
+	tp->LobeWireFaultLogged	= 0;
+	tp->LastOpenStatus	= 0;
+	tp->MaxPacketSize	= DEFAULT_PACKET_SIZE;
+
+	skb_queue_head_init(&tp->SendSkbQueue);
+	tp->QueueSkb = MAX_TX_QUEUE;
+
+	/* Create circular chain of transmit lists */
+	for (i = 0; i < TPL_NUM; i++)
+	{
+		tp->Tpl[i].NextTPLAddr = htonl((unsigned long) virt_to_bus(&tp->Tpl[(i+1) % TPL_NUM]));
+		tp->Tpl[i].Status	= 0;
+		tp->Tpl[i].FrameSize	= 0;
+		tp->Tpl[i].FragList[0].DataCount	= 0;
+		tp->Tpl[i].FragList[0].DataAddr		= 0;
+		tp->Tpl[i].NextTPLPtr	= &tp->Tpl[(i+1) % TPL_NUM];
+		tp->Tpl[i].MData	= NULL;
+		tp->Tpl[i].TPLIndex	= i;
+		tp->Tpl[i].BusyFlag	= 0;
+	}
+
+	tp->TplFree = tp->TplBusy = &tp->Tpl[0];
+
+	/* Create circular chain of receive lists */
+	for (i = 0; i < RPL_NUM; i++)
+	{
+		tp->Rpl[i].NextRPLAddr = htonl((unsigned long) virt_to_bus(&tp->Rpl[(i+1) % RPL_NUM]));
+		tp->Rpl[i].Status = (RX_VALID | RX_START_FRAME | RX_END_FRAME | RX_FRAME_IRQ);
+		tp->Rpl[i].FrameSize = 0;
+		tp->Rpl[i].FragList[0].DataCount = SWAPB(tp->MaxPacketSize);
+
+		/* Alloc skb and point adapter to data area */
+		tp->Rpl[i].Skb = dev_alloc_skb(tp->MaxPacketSize);
+
+		/* skb == NULL ? then use local buffer */
+		if(tp->Rpl[i].Skb == NULL)
+		{
+			tp->Rpl[i].SkbStat = SKB_UNAVAILABLE;
+			tp->Rpl[i].FragList[0].DataAddr = htonl(virt_to_bus(tp->LocalRxBuffers[i]));
+			tp->Rpl[i].MData = tp->LocalRxBuffers[i];
+		}
+		else	/* SKB != NULL */
+		{
+			tp->Rpl[i].Skb->dev = dev;
+			skb_put(tp->Rpl[i].Skb, tp->MaxPacketSize);
+
+			/* data unreachable for DMA ? then use local buffer */
+			if(virt_to_bus(tp->Rpl[i].Skb->data) + tp->MaxPacketSize > ISA_MAX_ADDRESS)
+			{
+				tp->Rpl[i].SkbStat = SKB_DATA_COPY;
+				tp->Rpl[i].FragList[0].DataAddr = htonl(virt_to_bus(tp->LocalRxBuffers[i]));
+				tp->Rpl[i].MData = tp->LocalRxBuffers[i];
+			}
+			else	/* DMA directly in skb->data */
+			{
+				tp->Rpl[i].SkbStat = SKB_DMA_DIRECT;
+				tp->Rpl[i].FragList[0].DataAddr = htonl(virt_to_bus(tp->Rpl[i].Skb->data));
+				tp->Rpl[i].MData = tp->Rpl[i].Skb->data;
+			}
+		}
+
+		tp->Rpl[i].NextRPLPtr = &tp->Rpl[(i+1) % RPL_NUM];
+		tp->Rpl[i].RPLIndex = i;
+	}
+
+	tp->RplHead = &tp->Rpl[0];
+	tp->RplTail = &tp->Rpl[RPL_NUM-1];
+	tp->RplTail->Status = (RX_START_FRAME | RX_END_FRAME | RX_FRAME_IRQ);
+
+	return;
+}
+
+/*
+ * Initializes the initialisation parameter block.
+ */
+static void sktr_init_ipb(struct net_local *tp)
+{
+	tp->ipb.Init_Options	= BURST_MODE;
+	tp->ipb.CMD_Status_IV	= 0;
+	tp->ipb.TX_IV		= 0;
+	tp->ipb.RX_IV		= 0;
+	tp->ipb.Ring_Status_IV	= 0;
+	tp->ipb.SCB_Clear_IV	= 0;
+	tp->ipb.Adapter_CHK_IV	= 0;
+	tp->ipb.RX_Burst_Size	= BURST_SIZE;
+	tp->ipb.TX_Burst_Size	= BURST_SIZE;
+	tp->ipb.DMA_Abort_Thrhld = DMA_RETRIES;
+	tp->ipb.SCB_Addr	= 0;
+	tp->ipb.SSB_Addr	= 0;
+
+	return;
+}
+
+/*
+ * Initializes the open parameter block.
+ */
+static void sktr_init_opb(struct net_local *tp)
+{
+	unsigned long Addr;
+	unsigned short RplSize    = RPL_SIZE;
+	unsigned short TplSize    = TPL_SIZE;
+	unsigned short BufferSize = BUFFER_SIZE;
+
+	tp->ocpl.OPENOptions 	 = 0;
+	tp->ocpl.OPENOptions 	|= ENABLE_FULL_DUPLEX_SELECTION;
+	tp->ocpl.OPENOptions 	|= PAD_ROUTING_FIELD;
+	tp->ocpl.FullDuplex 	 = 0;
+	tp->ocpl.FullDuplex 	|= OPEN_FULL_DUPLEX_OFF;
+
+	/* Fixme: If mac address setable:
+	 * for (i=0; i<LENGTH_OF_ADDRESS; i++)
+	 *	mac->Vam->ocpl.NodeAddr[i] = mac->CurrentAddress[i];
+	 */
+
+	tp->ocpl.GroupAddr	 = 0;
+	tp->ocpl.FunctAddr	 = 0;
+	tp->ocpl.RxListSize	 = SWAPB(RplSize);
+	tp->ocpl.TxListSize	 = SWAPB(TplSize);
+	tp->ocpl.BufSize	 = SWAPB(BufferSize);
+	tp->ocpl.Reserved	 = 0;
+	tp->ocpl.TXBufMin	 = TX_BUF_MIN;
+	tp->ocpl.TXBufMax	 = TX_BUF_MAX;
+
+	Addr = htonl(virt_to_bus(tp->ProductID));
+
+	tp->ocpl.ProdIDAddr[0]	 = LOWORD(Addr);
+	tp->ocpl.ProdIDAddr[1]	 = HIWORD(Addr);
+
+	return;
+}
+
+/*
+ * Send OPEN command to adapter
+ */
+static void sktr_open_adapter(struct device *dev)
+{
+	struct net_local *tp = (struct net_local *)dev->priv;
+
+	if(tp->OpenCommandIssued)
+		return;
+
+	tp->OpenCommandIssued = 1;
+	sktr_exec_cmd(dev, OC_OPEN);
+
+	return;
+}
+
+/*
+ * Clear the adapter's interrupt flag. Clear system interrupt enable
+ * (SINTEN): disable adapter to system interrupts.
+ */
+static void sktr_disable_interrupts(struct device *dev)
+{
+	outb(0, dev->base_addr + SIFACL);
+
+	return;
+}
+
+/*
+ * Set the adapter's interrupt flag. Set system interrupt enable
+ * (SINTEN): enable adapter to system interrupts.
+ */
+static void sktr_enable_interrupts(struct device *dev)
+{
+	outb(ACL_SINTEN, dev->base_addr + SIFACL);
+
+	return;
+}
+
+/*
+ * Put command in command queue, try to execute it.
+ */
+static void sktr_exec_cmd(struct device *dev, unsigned short Command)
+{
+	struct net_local *tp = (struct net_local *)dev->priv;
+
+	tp->CMDqueue |= Command;
+	sktr_chk_outstanding_cmds(dev);
+
+	return;
+}
+
+/*
+ * Linux always gives 18 byte of source routing information in the frame header.
+ * But the length field can indicate shorter length. Then cut header
+ * appropriate.
+ */
+static unsigned char *sktr_fix_srouting(unsigned char *buf, short *FrameLen)
+{
+	struct trh_hdr *trh = (struct trh_hdr *)buf;
+	int len;
+        
+	if(buf[8] & TR_RII)
+	{
+		trh->rcf &= ~SWAPB((unsigned short) TR_RCF_LONGEST_FRAME_MASK);
+		trh->rcf |= SWAPB((unsigned short) TR_RCF_FRAME4K);
+		len = (SWAPB(trh->rcf) & TR_RCF_LEN_MASK) >> 8;
+		if(len < 18)
+		{
+			memcpy(&buf[18-len],buf,sizeof(struct trh_hdr)-18+len);
+			*FrameLen -= (18 - len);
+		}
+		return (&buf[18-len]);
+	}
+
+	return (buf);
+}
+
+/*
+ * Gets skb from system, queues it and checks if it can be sent
+ */
+static int sktr_send_packet(struct sk_buff *skb, struct device *dev)
+{
+	struct net_local *tp = (struct net_local *)dev->priv;
+
+	if(dev->tbusy)
+	{
+		/*
+		 * If we get here, some higher level has decided we are broken.
+		 * There should really be a "kick me" function call instead.
+		 *
+		 * Resetting the token ring adapter takes a long time so just
+		 * fake transmission time and go on trying. Our own timeout
+		 * routine is in sktr_timer_chk()
+		 */
+		dev->tbusy 	 = 0;
+		dev->trans_start = jiffies;
+		return (1);
+	}
+
+	/*
+	 * If some higher layer thinks we've missed an tx-done interrupt we
+	 * are passed NULL.
+	 */
+	if(skb == NULL)
+		return (0);
+
+	/*
+	 * 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);
+		return (1);
+	}
+
+	if(tp->QueueSkb == 0)
+		return (1);	/* Return with tbusy set: queue full */
+
+	tp->QueueSkb--;
+	skb_queue_tail(&tp->SendSkbQueue, skb);
+	sktr_hardware_send_packet(dev, tp);
+	if(tp->QueueSkb > 0)
+		dev->tbusy = 0;
+
+	return (0);
+}
+
+/*
+ * Move frames from internal skb queue into adapter tx queue
+ */
+static void sktr_hardware_send_packet(struct device *dev, struct net_local* tp)
+{
+	TPL *tpl;
+	short length;
+	unsigned char *buf, *newbuf;
+	struct sk_buff *skb;
+	int i;
+    
+	for(;;)
+	{
+		/* Try to get a free TPL from the chain.
+		 *
+		 * NOTE: We *must* always leave one unused TPL in the chain, 
+		 * because otherwise the adapter might send frames twice.
+		 */
+		if(tp->TplFree->NextTPLPtr->BusyFlag)	/* No free TPL */
+		{
+			printk(KERN_INFO "%s: No free TPL\n", dev->name);
+			return;
+		}
+
+		/* Send first buffer from queue */
+		skb = skb_dequeue(&tp->SendSkbQueue);
+		if(skb == NULL)
+			return;
+
+		tp->QueueSkb++;
+		/* Is buffer reachable for Busmaster-DMA? */
+		if(virt_to_bus((void*)(((long) skb->data) + skb->len))
+			> ISA_MAX_ADDRESS)
+		{
+			/* Copy frame to local buffer */
+			i 	= tp->TplFree->TPLIndex;
+			length 	= skb->len;
+			buf 	= tp->LocalTxBuffers[i];
+			memcpy(buf, skb->data, length);
+			newbuf 	= sktr_fix_srouting(buf, &length);
+		}
+		else
+		{
+			/* Send direct from skb->data */
+			length = skb->len;
+			newbuf = sktr_fix_srouting(skb->data, &length);
+		}
+
+		/* Source address in packet? */
+		sktr_chk_src_addr(newbuf, dev->dev_addr);
+
+		tp->LastSendTime	= jiffies;
+		tpl 			= tp->TplFree;	/* Get the "free" TPL */
+		tpl->BusyFlag 		= 1;		/* Mark TPL as busy */
+		tp->TplFree 		= tpl->NextTPLPtr;
+    
+		/* Save the skb for delayed return of skb to system */
+		tpl->Skb = skb;
+		tpl->FragList[0].DataCount = (unsigned short) SWAPB(length);
+		tpl->FragList[0].DataAddr  = htonl(virt_to_bus(newbuf));
+
+		/* Write the data length in the transmit list. */
+		tpl->FrameSize 	= (unsigned short) SWAPB(length);
+		tpl->MData 	= newbuf;
+
+		/* Transmit the frame and set the status values. */
+		sktr_write_tpl_status(tpl, TX_VALID | TX_START_FRAME
+					| TX_END_FRAME | TX_PASS_SRC_ADDR
+					| TX_FRAME_IRQ);
+
+		/* Let adapter send the frame. */
+		sktr_exec_sifcmd(dev, CMD_TX_VALID);
+	}
+
+	return;
+}
+
+/*
+ * Write the given value to the 'Status' field of the specified TPL.
+ * NOTE: This function should be used whenever the status of any TPL must be
+ * modified by the driver, because the compiler may otherwise change the
+ * order of instructions such that writing the TPL status may be executed at
+ * an undesireable time. When this function is used, the status is always
+ * written when the function is called.
+ */
+static void sktr_write_tpl_status(TPL *tpl, unsigned int Status)
+{
+	tpl->Status = Status;
+}
+
+static void sktr_chk_src_addr(unsigned char *frame, unsigned char *hw_addr)
+{
+	unsigned char SRBit;
+
+	if((((unsigned long)frame[8]) & ~0x80) != 0)	/* Compare 4 bytes */
+		return;
+	if((unsigned short)frame[12] != 0)		/* Compare 2 bytes */
+		return;
+
+	SRBit = frame[8] & 0x80;
+	memcpy(&frame[8], hw_addr, 6);
+	frame[8] |= SRBit;
+
+	return;
+}
+
+/*
+ * The timer routine: Check if adapter still open and working, reopen if not. 
+ */
+static void sktr_timer_chk(unsigned long data)
+{
+	struct device *dev = (struct device*)data;
+	struct net_local *tp = (struct net_local*)dev->priv;
+
+	if(tp->HaltInProgress)
+		return;
+
+	sktr_chk_outstanding_cmds(dev);
+	if(tp->LastSendTime + SEND_TIMEOUT < jiffies
+		&& (tp->QueueSkb < MAX_TX_QUEUE || tp->TplFree != tp->TplBusy))
+	{
+		/* Anything to send, but stalled to long */
+		tp->LastSendTime = jiffies;
+		sktr_exec_cmd(dev, OC_CLOSE);	/* Does reopen automatically */
+	}
+
+	tp->timer.expires = jiffies + 2*HZ;
+	add_timer(&tp->timer);
+
+	if(tp->AdapterOpenFlag || tp->ReOpenInProgress)
+		return;
+	tp->ReOpenInProgress = 1;
+	sktr_open_adapter(dev);
+
+	return;
+}
+
+/*
+ * The typical workload of the driver: Handle the network interface interrupts.
+ */
+static void sktr_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+	struct device *dev = dev_id;
+	struct net_local *tp;
+	int ioaddr;
+	unsigned short irq_type;
+
+	if(dev == NULL)
+	{
+		printk("%s: irq %d for unknown device.\n", dev->name, irq);
+		return;
+	}
+
+	dev->interrupt = 1;
+
+	ioaddr = dev->base_addr;
+	tp = (struct net_local *)dev->priv;
+
+	irq_type = inw(ioaddr + SIFSTS);
+
+	while(irq_type & STS_SYSTEM_IRQ)
+	{
+		irq_type &= STS_IRQ_MASK;
+
+		if(!sktr_chk_ssb(tp, irq_type))
+		{
+			printk(KERN_INFO "%s: DATA LATE occured\n", dev->name);
+			break;
+		}
+
+		switch(irq_type)
+		{
+			case STS_IRQ_RECEIVE_STATUS:
+				sktr_reset_interrupt(dev);
+				sktr_rcv_status_irq(dev);
+				break;
+
+			case STS_IRQ_TRANSMIT_STATUS:
+				/* Check if TRANSMIT.HALT command is complete */
+				if(tp->ssb.Parm[0] & COMMAND_COMPLETE)
+				{
+					tp->TransmitCommandActive = 0;
+					tp->TransmitHaltScheduled = 0;
+
+					/* Issue a new transmit command. */
+					sktr_exec_cmd(dev, OC_TRANSMIT);
+				}
+
+				sktr_reset_interrupt(dev);
+				sktr_tx_status_irq(dev);
+				break;
+
+			case STS_IRQ_COMMAND_STATUS:
+				/* The SSB contains status of last command
+				 * other than receive/transmit.
+				 */
+				sktr_cmd_status_irq(dev);
+				break;
+
+			case STS_IRQ_SCB_CLEAR:
+				/* The SCB is free for another command. */
+				tp->ScbInUse = 0;
+				sktr_chk_outstanding_cmds(dev);
+				break;
+
+			case STS_IRQ_RING_STATUS:
+				sktr_ring_status_irq(dev);
+				break;
+
+			case STS_IRQ_ADAPTER_CHECK:
+				sktr_chk_irq(dev);
+				break;
+
+			default:
+				printk(KERN_INFO "Unknown Token Ring IRQ\n");
+				break;
+		}
+
+		/* Reset system interrupt if not already done. */
+		if(irq_type != STS_IRQ_TRANSMIT_STATUS
+			&& irq_type != STS_IRQ_RECEIVE_STATUS)
+		{
+			sktr_reset_interrupt(dev);
+		}
+
+		irq_type = inw(ioaddr + SIFSTS);
+	}
+
+	dev->interrupt = 0;
+
+	return;
+}
+
+/*
+ *  Reset the INTERRUPT SYSTEM bit and issue SSB CLEAR command.
+ */
+static void sktr_reset_interrupt(struct device *dev)
+{
+	struct net_local *tp = (struct net_local *)dev->priv;
+	SSB *ssb = &tp->ssb;
+
+	/*
+	 * [Workaround for "Data Late"]
+	 * Set all fields of the SSB to well-defined values so we can
+	 * check if the adapter has written the SSB.
+	 */
+
+	ssb->STS	= (unsigned short) -1;
+	ssb->Parm[0] 	= (unsigned short) -1;
+	ssb->Parm[1] 	= (unsigned short) -1;
+	ssb->Parm[2] 	= (unsigned short) -1;
+
+	/* Free SSB by issuing SSB_CLEAR command after reading IRQ code
+	 * and clear STS_SYSTEM_IRQ bit: enable adapter for further interrupts.
+	 */
+	sktr_exec_sifcmd(dev, CMD_SSB_CLEAR | CMD_CLEAR_SYSTEM_IRQ);
+
+	return;
+}
+
+/*
+ * Check if the SSB has actually been written by the adapter.
+ */
+static unsigned char sktr_chk_ssb(struct net_local *tp, unsigned short IrqType)
+{
+	SSB *ssb = &tp->ssb;	/* The address of the SSB. */
+
+	/* C 0 1 2 INTERRUPT CODE
+	 * - - - - --------------
+	 * 1 1 1 1 TRANSMIT STATUS
+	 * 1 1 1 1 RECEIVE STATUS
+	 * 1 ? ? 0 COMMAND STATUS
+	 * 0 0 0 0 SCB CLEAR
+	 * 1 1 0 0 RING STATUS
+	 * 0 0 0 0 ADAPTER CHECK
+	 *
+	 * 0 = SSB field not affected by interrupt
+	 * 1 = SSB field is affected by interrupt
+	 *
+	 * C = SSB ADDRESS +0: COMMAND
+	 * 0 = SSB ADDRESS +2: STATUS 0
+	 * 1 = SSB ADDRESS +4: STATUS 1
+	 * 2 = SSB ADDRESS +6: STATUS 2
+	 */
+
+	/* Check if this interrupt does use the SSB. */
+
+	if(IrqType != STS_IRQ_TRANSMIT_STATUS
+		&& IrqType != STS_IRQ_RECEIVE_STATUS
+		&& IrqType != STS_IRQ_COMMAND_STATUS
+		&& IrqType != STS_IRQ_RING_STATUS)
+	{
+		return (1);	/* SSB not involved. */
+	}
+
+	/* Note: All fields of the SSB have been set to all ones (-1) after it
+	 * has last been used by the software (see DriverIsr()).
+	 *
+	 * Check if the affected SSB fields are still unchanged.
+	 */
+
+	if(ssb->STS == (unsigned short) -1)
+		return (0);	/* Command field not yet available. */
+	if(IrqType == STS_IRQ_COMMAND_STATUS)
+		return (1);	/* Status fields not always affected. */
+	if(ssb->Parm[0] == (unsigned short) -1)
+		return (0);	/* Status 1 field not yet available. */
+	if(IrqType == STS_IRQ_RING_STATUS)
+		return (1);	/* Status 2 & 3 fields not affected. */
+
+	/* Note: At this point, the interrupt is either TRANSMIT or RECEIVE. */
+	if(ssb->Parm[1] == (unsigned short) -1)
+		return (0);	/* Status 2 field not yet available. */
+	if(ssb->Parm[2] == (unsigned short) -1)
+		return (0);	/* Status 3 field not yet available. */
+
+	return (1);	/* All SSB fields have been written by the adapter. */
+}
+
+/*
+ * Evaluates the command results status in the SSB status field.
+ */
+static void sktr_cmd_status_irq(struct device *dev)
+{
+	struct net_local *tp = (struct net_local *)dev->priv;
+	unsigned short ssb_cmd, ssb_parm_0;
+	unsigned short ssb_parm_1;
+	char *open_err = "Open error -";
+	char *code_err = "Open code -";
+
+	/* Copy the ssb values to local variables */
+	ssb_cmd    = tp->ssb.STS;
+	ssb_parm_0 = tp->ssb.Parm[0];
+	ssb_parm_1 = tp->ssb.Parm[1];
+
+	if(ssb_cmd == OPEN)
+	{
+		tp->Sleeping = 0;
+		if(!tp->ReOpenInProgress)
+	    		wake_up_interruptible(&tp->wait_for_tok_int);
+
+		tp->OpenCommandIssued = 0;
+		tp->ScbInUse = 0;
+
+		if((ssb_parm_0 & 0x00FF) == GOOD_COMPLETION)
+		{
+			/* Success, the adapter is open. */
+			tp->LobeWireFaultLogged	= 0;
+			tp->AdapterOpenFlag 	= 1;
+			tp->AdapterVirtOpenFlag = 1;
+			tp->TransmitCommandActive = 0;
+			sktr_exec_cmd(dev, OC_TRANSMIT);
+			sktr_exec_cmd(dev, OC_RECEIVE);
+
+			if(tp->ReOpenInProgress)
+				tp->ReOpenInProgress = 0;
+
+			return;
+		}
+		else 	/* The adapter did not open. */
+		{
+	    		if(ssb_parm_0 & NODE_ADDR_ERROR)
+				printk(KERN_INFO "%s: Node address error\n",
+					dev->name);
+	    		if(ssb_parm_0 & LIST_SIZE_ERROR)
+				printk(KERN_INFO "%s: List size error\n",
+					dev->name);
+	    		if(ssb_parm_0 & BUF_SIZE_ERROR)
+				printk(KERN_INFO "%s: Buffer size error\n",
+					dev->name);
+	    		if(ssb_parm_0 & TX_BUF_COUNT_ERROR)
+				printk(KERN_INFO "%s: Tx buffer count error\n",
+					dev->name);
+	    		if(ssb_parm_0 & INVALID_OPEN_OPTION)
+				printk(KERN_INFO "%s: Invalid open option\n",
+					dev->name);
+	    		if(ssb_parm_0 & OPEN_ERROR)
+			{
+				/* Show the open phase. */
+				switch(ssb_parm_0 & OPEN_PHASES_MASK)
+				{
+					case LOBE_MEDIA_TEST:
+						if(!tp->LobeWireFaultLogged)
+						{
+							tp->LobeWireFaultLogged = 1;
+							printk(KERN_INFO "%s: %s Lobe wire fault (check cable !).\n", dev->name, open_err);
+		    				}
+						tp->ReOpenInProgress	= 1;
+						tp->AdapterOpenFlag 	= 0;
+						tp->AdapterVirtOpenFlag = 1;
+						sktr_open_adapter(dev);
+						return;
+
+					case PHYSICAL_INSERTION:
+						printk(KERN_INFO "%s: %s Physical insertion.\n", dev->name, open_err);
+						break;
+
+					case ADDRESS_VERIFICATION:
+						printk(KERN_INFO "%s: %s Address verification.\n", dev->name, open_err);
+						break;
+
+					case PARTICIPATION_IN_RING_POLL:
+						printk(KERN_INFO "%s: %s Participation in ring poll.\n", dev->name, open_err);
+						break;
+
+					case REQUEST_INITIALISATION:
+						printk(KERN_INFO "%s: %s Request initialisation.\n", dev->name, open_err);
+						break;
+
+					case FULLDUPLEX_CHECK:
+						printk(KERN_INFO "%s: %s Full duplex check.\n", dev->name, open_err);
+						break;
+
+					default:
+						printk(KERN_INFO "%s: %s Unknown open phase\n", dev->name, open_err);
+						break;
+				}
+
+				/* Show the open errors. */
+				switch(ssb_parm_0 & OPEN_ERROR_CODES_MASK)
+				{
+					case OPEN_FUNCTION_FAILURE:
+						printk(KERN_INFO "%s: %s OPEN_FUNCTION_FAILURE", dev->name, code_err);
+						tp->LastOpenStatus =
+							OPEN_FUNCTION_FAILURE;
+						break;
+
+					case OPEN_SIGNAL_LOSS:
+						printk(KERN_INFO "%s: %s OPEN_SIGNAL_LOSS\n", dev->name, code_err);
+						tp->LastOpenStatus =
+							OPEN_SIGNAL_LOSS;
+						break;
+
+					case OPEN_TIMEOUT:
+						printk(KERN_INFO "%s: %s OPEN_TIMEOUT\n", dev->name, code_err);
+						tp->LastOpenStatus =
+							OPEN_TIMEOUT;
+						break;
+
+					case OPEN_RING_FAILURE:
+						printk(KERN_INFO "%s: %s OPEN_RING_FAILURE\n", dev->name, code_err);
+						tp->LastOpenStatus =
+							OPEN_RING_FAILURE;
+						break;
+
+					case OPEN_RING_BEACONING:
+						printk(KERN_INFO "%s: %s OPEN_RING_BEACONING\n", dev->name, code_err);
+						tp->LastOpenStatus =
+							OPEN_RING_BEACONING;
+						break;
+
+					case OPEN_DUPLICATE_NODEADDR:
+						printk(KERN_INFO "%s: %s OPEN_DUPLICATE_NODEADDR\n", dev->name, code_err);
+						tp->LastOpenStatus =
+							OPEN_DUPLICATE_NODEADDR;
+						break;
+
+					case OPEN_REQUEST_INIT:
+						printk(KERN_INFO "%s: %s OPEN_REQUEST_INIT\n", dev->name, code_err);
+						tp->LastOpenStatus =
+							OPEN_REQUEST_INIT;
+						break;
+
+					case OPEN_REMOVE_RECEIVED:
+						printk(KERN_INFO "%s: %s OPEN_REMOVE_RECEIVED", dev->name, code_err);
+						tp->LastOpenStatus =
+							OPEN_REMOVE_RECEIVED;
+						break;
+
+					case OPEN_FULLDUPLEX_SET:
+						printk(KERN_INFO "%s: %s OPEN_FULLDUPLEX_SET\n", dev->name, code_err);
+						tp->LastOpenStatus =
+							OPEN_FULLDUPLEX_SET;
+						break;
+
+					default:
+						printk(KERN_INFO "%s: %s Unknown open err code", dev->name, code_err);
+						tp->LastOpenStatus =
+							OPEN_FUNCTION_FAILURE;
+						break;
+				}
+			}
+
+			tp->AdapterOpenFlag 	= 0;
+			tp->AdapterVirtOpenFlag = 0;
+
+			return;
+		}
+	}
+	else
+	{
+		if(ssb_cmd != READ_ERROR_LOG)
+			return;
+
+		/* Add values from the error log table to the MAC
+		 * statistics counters and update the errorlogtable
+		 * memory.
+		 */
+		tp->MacStat.line_errors += tp->errorlogtable.Line_Error;
+		tp->MacStat.burst_errors += tp->errorlogtable.Burst_Error;
+		tp->MacStat.A_C_errors += tp->errorlogtable.ARI_FCI_Error;
+		tp->MacStat.lost_frames += tp->errorlogtable.Lost_Frame_Error;
+		tp->MacStat.recv_congest_count += tp->errorlogtable.Rx_Congest_Error;
+		tp->MacStat.rx_errors += tp->errorlogtable.Rx_Congest_Error;
+		tp->MacStat.frame_copied_errors += tp->errorlogtable.Frame_Copied_Error;
+		tp->MacStat.token_errors += tp->errorlogtable.Token_Error;
+		tp->MacStat.dummy1 += tp->errorlogtable.DMA_Bus_Error;
+		tp->MacStat.dummy1 += tp->errorlogtable.DMA_Parity_Error;
+		tp->MacStat.abort_delimiters += tp->errorlogtable.AbortDelimeters;
+		tp->MacStat.frequency_errors += tp->errorlogtable.Frequency_Error;
+		tp->MacStat.internal_errors += tp->errorlogtable.Internal_Error;
+	}
+
+	return;
+}
+
+/*
+ * The inverse routine to sktr_open().
+ */
+static int sktr_close(struct device *dev)
+{
+	struct net_local *tp = (struct net_local *)dev->priv;
+
+	dev->tbusy = 1;
+	dev->start = 0;
+
+	del_timer(&tp->timer);
+
+	/* Flush the Tx and disable Rx here. */
+
+	tp->HaltInProgress 	= 1;
+	sktr_exec_cmd(dev, OC_CLOSE);
+	tp->timer.expires	= jiffies + 1*HZ;
+	tp->timer.function 	= sktr_timer_end_wait;
+	tp->timer.data 		= (unsigned long)dev;
+	add_timer(&tp->timer);
+
+	sktr_enable_interrupts(dev);
+
+	tp->Sleeping = 1;
+	interruptible_sleep_on(&tp->wait_for_tok_int);
+	tp->TransmitCommandActive = 0;
+    
+	del_timer(&tp->timer);
+	sktr_disable_interrupts(dev);
+   
+	if(dev->dma > 0) 
+		disable_dma(dev->dma);
+	outw(0xFF00, dev->base_addr + SIFCMD);
+	if(dev->dma > 0)
+		outb(0xff, dev->base_addr + POSREG);
+
+#ifdef MODULE
+	MOD_DEC_USE_COUNT;
+#endif
+
+	sktr_cancel_tx_queue(tp);
+
+	return (0);
+}
+
+/*
+ * Get the current statistics. This may be called with the card open
+ * or closed.
+ */
+static struct enet_statistics *sktr_get_stats(struct device *dev)
+{
+	struct net_local *tp = (struct net_local *)dev->priv;
+
+	return ((struct enet_statistics *)&tp->MacStat);
+}
+
+/*
+ * Set or clear the multicast filter for this adapter.
+ */
+static void sktr_set_multicast_list(struct device *dev)
+{
+	struct net_local *tp = (struct net_local *)dev->priv;
+	unsigned int OpenOptions;
+
+	OpenOptions = tp->ocpl.OPENOptions &
+		~(PASS_ADAPTER_MAC_FRAMES
+		| PASS_ATTENTION_FRAMES
+		| PASS_BEACON_MAC_FRAMES
+		| COPY_ALL_MAC_FRAMES
+		| COPY_ALL_NON_MAC_FRAMES);
+
+	if(dev->flags & IFF_PROMISC)
+		/* Enable promiscuous mode */
+		OpenOptions |= COPY_ALL_NON_MAC_FRAMES | COPY_ALL_MAC_FRAMES;
+	else
+	{
+		if(dev->flags & IFF_ALLMULTI)
+			/* || dev->mc_count > HW_MAX_ADDRS) */
+		{
+			/* Disable promiscuous mode, use normal mode. */
+		}
+		else
+		{
+			if(dev->mc_count)
+			{
+				/* Walk the address list, and load the filter */
+			}
+		}
+	}
+
+	tp->ocpl.OPENOptions = OpenOptions;
+	sktr_exec_cmd(dev, OC_MODIFY_OPEN_PARMS);
+
+	return;
+}
+
+/*
+ * Wait for some time (microseconds)
+ */
+static void sktr_wait(unsigned long time)
+{
+	long tmp;
+
+	tmp = jiffies + time/(1000000/HZ);
+	do {
+		current->timeout	= tmp;
+		current->state 		= TASK_INTERRUPTIBLE;
+		schedule();
+	} while(tmp > jiffies);
+
+	return;
+}
+
+/*
+ * Write a command value to the SIFCMD register
+ */
+static void sktr_exec_sifcmd(struct device *dev, unsigned int WriteValue)
+{
+	int ioaddr = dev->base_addr;
+	unsigned short cmd;
+	unsigned short SifStsValue;
+	unsigned long loop_counter;
+
+	WriteValue = ((WriteValue ^ CMD_SYSTEM_IRQ) | CMD_INTERRUPT_ADAPTER);
+	cmd = (unsigned short)WriteValue;
+	loop_counter = 0,5 * 800000;
+	do {
+		SifStsValue = inw(ioaddr + SIFSTS);
+	} while((SifStsValue & CMD_INTERRUPT_ADAPTER) && loop_counter--);
+	outw(cmd, ioaddr + SIFCMD);
+
+	return;
+}
+
+/*
+ * Processes adapter hardware reset, halts adapter and downloads firmware,
+ * clears the halt bit.
+ */
+static int sktr_reset_adapter(struct device *dev)
+{
+	struct net_local *tp = (struct net_local *)dev->priv;
+	unsigned short *fw_ptr = (unsigned short *)&sktr_code;
+	unsigned short count, c;
+	int ioaddr = dev->base_addr;
+
+	/* Hardware adapter reset */
+	outw(ACL_ARESET, ioaddr + SIFACL);
+	sktr_wait(40);
+
+	c = inw(ioaddr + SIFACL);
+	sktr_wait(20);
+
+	if(dev->dma == 0)	/* For PCI adapters */
+	{
+		c &= ~(ACL_SPEED4 | ACL_SPEED16);	/* Clear bits */
+		if(tp->DataRate == SPEED_4)
+			c |= ACL_SPEED4;		/* Set 4Mbps */
+		else
+			c |= ACL_SPEED16;		/* Set 16Mbps */
+	}
+
+	/* In case a comand is pending - forget it */
+	tp->ScbInUse = 0;
+
+	c &= ~ACL_ARESET;		/* Clear adapter reset bit */
+	c |=  ACL_CPHALT;		/* Halt adapter CPU, allow download */
+	c &= ~ACL_PSDMAEN;		/* Clear pseudo dma bit */
+	outw(c, ioaddr + SIFACL);
+	sktr_wait(40);
+
+	/* Download firmware via DIO interface: */
+	do {
+		/* Download first address part */
+		outw(*fw_ptr, ioaddr + SIFADX);
+		fw_ptr++;
+
+		/* Download second address part */
+		outw(*fw_ptr, ioaddr + SIFADD);
+		fw_ptr++;
+
+		if((count = *fw_ptr) != 0)	/* Load loop counter */
+		{
+			fw_ptr++;	/* Download block data */
+			for(; count > 0; count--)
+			{
+				outw(*fw_ptr, ioaddr + SIFINC);
+				fw_ptr++;
+			}
+		}
+		else	/* Stop, if last block downloaded */
+		{
+			c = inw(ioaddr + SIFACL);
+			c &= (~ACL_CPHALT | ACL_SINTEN);
+
+			/* Clear CPHALT and start BUD */
+			outw(c, ioaddr + SIFACL);
+			return (1);
+		}
+	} while(count == 0);
+
+	return (-1);
+}
+
+/*
+ * Starts bring up diagnostics of token ring adapter and evaluates
+ * diagnostic results.
+ */
+static int sktr_bringup_diags(struct device *dev)
+{
+	int loop_cnt, retry_cnt;
+	unsigned short Status;
+	int ioaddr = dev->base_addr;
+
+	sktr_wait(HALF_SECOND);
+	sktr_exec_sifcmd(dev, EXEC_SOFT_RESET);
+	sktr_wait(HALF_SECOND);
+
+	retry_cnt = BUD_MAX_RETRIES;	/* maximal number of retrys */
+
+	do {
+		retry_cnt--;
+		if(sktr_debug > 3)
+			printk(KERN_INFO "BUD-Status: \n");
+		loop_cnt = BUD_MAX_LOOPCNT;	/* maximum: three seconds*/
+		do {			/* Inspect BUD results */
+			loop_cnt--;
+			sktr_wait(HALF_SECOND);
+			Status = inw(ioaddr + SIFSTS);
+			Status &= STS_MASK;
+
+			if(sktr_debug > 3)
+				printk(KERN_INFO " %04X \n", Status);
+			/* BUD successfully completed */
+			if(Status == STS_INITIALIZE)
+				return (1);
+		/* Unrecoverable hardware error, BUD not completed? */
+		} while((loop_cnt > 0) && ((Status & (STS_ERROR | STS_TEST))
+			!= (STS_ERROR | STS_TEST)));
+
+		/* Error preventing completion of BUD */
+		if(retry_cnt > 0)
+		{
+			printk(KERN_INFO "%s: Adapter Software Reset.\n", 
+				dev->name);
+			sktr_exec_sifcmd(dev, EXEC_SOFT_RESET);
+			sktr_wait(HALF_SECOND);
+		}
+	} while(retry_cnt > 0);
+
+	Status = inw(ioaddr + SIFSTS);
+	Status &= STS_ERROR_MASK;	/* Hardware error occured! */
+
+	printk(KERN_INFO "%s: Bring Up Diagnostics Error (%04X) occurred\n",
+		dev->name, Status);
+
+	return (-1);
+}
+
+/*
+ * Copy initialisation data to adapter memory, beginning at address
+ * 1:0A00; Starting DMA test and evaluating result bits.
+ */
+static int sktr_init_adapter(struct device *dev)
+{
+	struct net_local *tp = (struct net_local *)dev->priv;
+
+	const unsigned char SCB_Test[6] = {0x00, 0x00, 0xC1, 0xE2, 0xD4, 0x8B};
+	const unsigned char SSB_Test[8] = {0xFF, 0xFF, 0xD1, 0xD7,
+						0xC5, 0xD9, 0xC3, 0xD4};
+	void *ptr = (void *)&tp->ipb;
+	unsigned short *ipb_ptr = (unsigned short *)ptr;
+	unsigned char *cb_ptr = (unsigned char *) &tp->scb;
+	unsigned char *sb_ptr = (unsigned char *) &tp->ssb;
+	unsigned short Status;
+	int i, loop_cnt, retry_cnt;
+	int ioaddr = dev->base_addr;
+
+	/* Normalize: byte order low/high, word order high/low! (only IPB!) */
+	tp->ipb.SCB_Addr = SWAPW(virt_to_bus(&tp->scb));
+	tp->ipb.SSB_Addr = SWAPW(virt_to_bus(&tp->ssb));
+
+	/* Maximum: three initialization retries */
+	retry_cnt = INIT_MAX_RETRIES;
+
+	do {
+		retry_cnt--;
+
+		/* Transfer initialization block */
+		outw(0x0001, ioaddr + SIFADX);
+
+		/* To address 0001:0A00 of adapter RAM */
+		outw(0x0A00, ioaddr + SIFADD);
+
+		/* Write 11 words to adapter RAM */
+		for(i = 0; i < 11; i++)
+			outw(ipb_ptr[i], ioaddr + SIFINC);
+
+		/* Execute SCB adapter command */
+		sktr_exec_sifcmd(dev, CMD_EXECUTE);
+
+		loop_cnt = INIT_MAX_LOOPCNT;	/* Maximum: 11 seconds */
+
+		/* While remaining retries, no error and not completed */
+		do {
+			Status = 0;
+			loop_cnt--;
+			sktr_wait(HALF_SECOND);
+
+			/* Mask interesting status bits */
+			Status = inw(ioaddr + SIFSTS);
+			Status &= STS_MASK;
+		} while(((Status &(STS_INITIALIZE | STS_ERROR | STS_TEST)) != 0)
+			&& ((Status & STS_ERROR) == 0) && (loop_cnt != 0));
+
+		if((Status & (STS_INITIALIZE | STS_ERROR | STS_TEST)) == 0)
+		{
+			/* Initialization completed without error */
+			i = 0;
+			do {	/* Test if contents of SCB is valid */
+				if(SCB_Test[i] != *(cb_ptr + i))
+					/* DMA data error: wrong data in SCB */
+					return (-1);
+				i++;
+			} while(i < 6);
+
+			i = 0;
+			do {	/* Test if contents of SSB is valid */
+				if(SSB_Test[i] != *(sb_ptr + i))
+					/* DMA data error: wrong data in SSB */
+					return (-1);
+				i++;
+			} while (i < 8);
+
+			return (1);	/* Adapter successfully initialized */
+		}
+		else
+		{
+			if((Status & STS_ERROR) != 0)
+			{
+				/* Initialization error occured */
+				Status = inw(ioaddr + SIFSTS);
+				Status &= STS_ERROR_MASK;
+				/* ShowInitialisationErrorCode(Status); */
+				return (-1); /* Unrecoverable error */
+			}
+			else
+			{
+				if(retry_cnt > 0)
+				{
+					/* Reset adapter and try init again */
+					sktr_exec_sifcmd(dev, EXEC_SOFT_RESET);
+					sktr_wait(HALF_SECOND);
+				}
+			}
+		}
+	} while(retry_cnt > 0);
+
+	return (-1);
+}
+
+/*
+ * Check for outstanding commands in command queue and tries to execute
+ * command immediately. Corresponding command flag in command queue is cleared.
+ */
+static void sktr_chk_outstanding_cmds(struct device *dev)
+{
+	struct net_local *tp = (struct net_local *)dev->priv;
+	unsigned long Addr = 0;
+	unsigned char i = 0;
+
+	if(tp->CMDqueue == 0)
+		return;		/* No command execution */
+
+	/* If SCB in use: no command */
+	if(tp->ScbInUse == 1)
+		return;
+
+	/* Check if adapter is opened, avoiding COMMAND_REJECT
+	 * interrupt by the adapter!
+	 */
+	if(tp->AdapterOpenFlag == 0)
+	{
+		if(tp->CMDqueue & OC_OPEN)
+		{
+			/* Execute OPEN command	*/
+			tp->CMDqueue ^= OC_OPEN;
+
+			/* Copy the 18 bytes of the product ID */
+			while((AdapterName[i] != '\0') && (i < PROD_ID_SIZE))
+			{
+				tp->ProductID[i] = AdapterName[i];
+				i++;
+			}
+
+			Addr = htonl(virt_to_bus(&tp->ocpl));
+			tp->scb.Parm[0] = LOWORD(Addr);
+			tp->scb.Parm[1] = HIWORD(Addr);
+			tp->scb.CMD = OPEN;
+		}
+		else
+			/* No OPEN command queued, but adapter closed. Note:
+			 * We'll try to re-open the adapter in DriverPoll()
+			 */
+			return;		/* No adapter command issued */
+	}
+	else
+	{
+		/* Adapter is open; evaluate command queue: try to execute
+		 * outstanding commands (depending on priority!) CLOSE
+		 * command queued
+		 */
+		if(tp->CMDqueue & OC_CLOSE)
+		{
+			tp->CMDqueue ^= OC_CLOSE;
+			tp->AdapterOpenFlag = 0;
+			tp->scb.Parm[0] = 0; /* Parm[0], Parm[1] are ignored */
+			tp->scb.Parm[1] = 0; /* but should be set to zero! */
+			tp->scb.CMD = CLOSE;
+			if(!tp->HaltInProgress)
+				tp->CMDqueue |= OC_OPEN; /* re-open adapter */
+			else
+				tp->CMDqueue = 0;	/* no more commands */
+		}
+		else
+		{
+			if(tp->CMDqueue & OC_RECEIVE)
+			{
+				tp->CMDqueue ^= OC_RECEIVE;
+				Addr = htonl(virt_to_bus(tp->RplHead));
+				tp->scb.Parm[0] = LOWORD(Addr);
+				tp->scb.Parm[1] = HIWORD(Addr);
+				tp->scb.CMD = RECEIVE;
+			}
+			else
+			{
+				if(tp->CMDqueue & OC_TRANSMIT_HALT)
+				{
+					/* NOTE: TRANSMIT.HALT must be checked 
+					 * before TRANSMIT.
+					 */
+					tp->CMDqueue ^= OC_TRANSMIT_HALT;
+					tp->scb.CMD = TRANSMIT_HALT;
+
+					/* Parm[0] and Parm[1] are ignored
+					 * but should be set to zero!
+					 */
+					tp->scb.Parm[0] = 0;
+					tp->scb.Parm[1] = 0;
+				}
+				else
+				{
+					if(tp->CMDqueue & OC_TRANSMIT)
+					{
+						/* NOTE: TRANSMIT must be 
+						 * checked after TRANSMIT.HALT
+						 */
+						if(tp->TransmitCommandActive)
+						{
+							if(!tp->TransmitHaltScheduled)
+							{
+								tp->TransmitHaltScheduled = 1;
+								sktr_exec_cmd(dev, OC_TRANSMIT_HALT) ;
+							}
+							tp->TransmitCommandActive = 0;
+							return;
+						}
+
+						tp->CMDqueue ^= OC_TRANSMIT;
+						sktr_cancel_tx_queue(tp);
+						Addr = htonl(virt_to_bus(tp->TplBusy));
+						tp->scb.Parm[0] = LOWORD(Addr);
+						tp->scb.Parm[1] = HIWORD(Addr);
+						tp->scb.CMD = TRANSMIT;
+						tp->TransmitCommandActive = 1;
+					}
+					else
+					{
+						if(tp->CMDqueue & OC_MODIFY_OPEN_PARMS)
+						{
+							tp->CMDqueue ^= OC_MODIFY_OPEN_PARMS;
+							tp->scb.Parm[0] = tp->ocpl.OPENOptions; /* new OPEN options*/
+							tp->scb.Parm[0] |= ENABLE_FULL_DUPLEX_SELECTION;
+							tp->scb.Parm[1] = 0; /* is ignored but should be zero */
+							tp->scb.CMD = MODIFY_OPEN_PARMS;
+						}
+						else
+						{
+							if(tp->CMDqueue & OC_SET_FUNCT_ADDR)
+							{
+								tp->CMDqueue ^= OC_SET_FUNCT_ADDR;
+								tp->scb.Parm[0] = LOWORD(tp->ocpl.FunctAddr);
+								tp->scb.Parm[1] = HIWORD(tp->ocpl.FunctAddr);
+								tp->scb.CMD = SET_FUNCT_ADDR;
+							}
+							else
+							{
+								if(tp->CMDqueue & OC_SET_GROUP_ADDR)
+								{
+									tp->CMDqueue ^= OC_SET_GROUP_ADDR;
+									tp->scb.Parm[0] = LOWORD(tp->ocpl.GroupAddr);
+									tp->scb.Parm[1] = HIWORD(tp->ocpl.GroupAddr);
+									tp->scb.CMD = SET_GROUP_ADDR;
+								}
+								else
+								{
+									if(tp->CMDqueue & OC_READ_ERROR_LOG)
+									{
+										tp->CMDqueue ^= OC_READ_ERROR_LOG;
+										Addr = htonl(virt_to_bus(&tp->errorlogtable));
+										tp->scb.Parm[0] = LOWORD(Addr);
+										tp->scb.Parm[1] = HIWORD(Addr);
+										tp->scb.CMD = READ_ERROR_LOG;
+									}
+									else
+									{
+										printk(KERN_WARNING "CheckForOutstandingCommand: unknown Command\n");
+										tp->CMDqueue = 0;
+										return;
+									}
+								}
+							}
+						}
+					}
+				}
+			}
+		}
+	}
+
+	tp->ScbInUse = 1;	/* Set semaphore: SCB in use. */
+
+	/* Execute SCB and generate IRQ when done. */
+	sktr_exec_sifcmd(dev, CMD_EXECUTE | CMD_SCB_REQUEST);
+
+	return;
+}
+
+/*
+ * IRQ conditions: signal loss on the ring, transmit or receive of beacon
+ * frames (disabled if bit 1 of OPEN option is set); report error MAC
+ * frame transmit (disabled if bit 2 of OPEN option is set); open or short
+ * cirquit fault on the lobe is detected; remove MAC frame received;
+ * error counter overflow (255); opened adapter is the only station in ring.
+ * After some of the IRQs the adapter is closed!
+ */
+static void sktr_ring_status_irq(struct device *dev)
+{
+	struct net_local *tp = (struct net_local *)dev->priv;
+
+	tp->CurrentRingStatus = SWAPB(tp->ssb.Parm[0]);
+
+	/* First: fill up statistics */
+	if(tp->ssb.Parm[0] & SIGNAL_LOSS)
+	{
+		printk(KERN_INFO "%s: Signal Loss\n", dev->name);
+		tp->MacStat.line_errors++;
+	}
+
+	/* Adapter is closed, but initialized */
+	if(tp->ssb.Parm[0] & LOBE_WIRE_FAULT)
+	{
+		printk(KERN_INFO "%s: Lobe Wire Fault, Reopen Adapter\n", 
+			dev->name);
+		tp->MacStat.line_errors++;
+	}
+
+	if(tp->ssb.Parm[0] & RING_RECOVERY)
+		printk(KERN_INFO "%s: Ring Recovery\n", dev->name);
+
+	/* Counter overflow: read error log */
+	if(tp->ssb.Parm[0] & COUNTER_OVERFLOW)
+	{
+		printk(KERN_INFO "%s: Counter Overflow\n", dev->name);
+		sktr_exec_cmd(dev, OC_READ_ERROR_LOG);
+	}
+
+	/* Adapter is closed, but initialized */
+	if(tp->ssb.Parm[0] & REMOVE_RECEIVED)
+		printk(KERN_INFO "%s: Remove Received, Reopen Adapter\n", 
+			dev->name);
+
+	/* Adapter is closed, but initialized */
+	if(tp->ssb.Parm[0] & AUTO_REMOVAL_ERROR)
+		printk(KERN_INFO "%s: Auto Removal Error, Reopen Adapter\n", 
+			dev->name);
+
+	if(tp->ssb.Parm[0] & HARD_ERROR)
+		printk(KERN_INFO "%s: Hard Error\n", dev->name);
+
+	if(tp->ssb.Parm[0] & SOFT_ERROR)
+		printk(KERN_INFO "%s: Soft Error\n", dev->name);
+
+	if(tp->ssb.Parm[0] & TRANSMIT_BEACON)
+		printk(KERN_INFO "%s: Transmit Beacon\n", dev->name);
+
+	if(tp->ssb.Parm[0] & SINGLE_STATION)
+		printk(KERN_INFO "%s: Single Station\n", dev->name);
+
+	/* Check if adapter has been closed */
+	if(tp->ssb.Parm[0] & ADAPTER_CLOSED)
+	{
+		printk(KERN_INFO "%s: Adapter closed (Reopening)," 
+			"QueueSkb %d, CurrentRingStat %x\n",
+			dev->name, tp->QueueSkb, tp->CurrentRingStatus);
+		tp->AdapterOpenFlag = 0;
+		sktr_open_adapter(dev);
+	}
+
+	return;
+}
+
+/*
+ * Issued if adapter has encountered an unrecoverable hardware
+ * or software error.
+ */
+static void sktr_chk_irq(struct device *dev)
+{
+	int i;
+	unsigned short AdapterCheckBlock[4];
+	unsigned short ioaddr = dev->base_addr;
+	struct net_local *tp = (struct net_local *)dev->priv;
+
+	tp->AdapterOpenFlag = 0;	/* Adapter closed now */
+
+	/* Page number of adapter memory */
+	outw(0x0001, ioaddr + SIFADX);
+	/* Address offset */
+	outw(CHECKADDR, ioaddr + SIFADR);
+
+	/* Reading 8 byte adapter check block. */
+	for(i = 0; i < 4; i++)
+		AdapterCheckBlock[i] = inw(ioaddr + SIFINC);
+
+	if(sktr_debug > 3)
+	{
+		printk("%s: AdapterCheckBlock: ", dev->name);
+		for (i = 0; i < 4; i++)
+			printk("%04X", AdapterCheckBlock[i]);
+		printk("\n");
+	}
+
+	switch(AdapterCheckBlock[0])
+	{
+		case DIO_PARITY:
+			printk(KERN_INFO "%s: DIO parity error\n", dev->name);
+			break;
+
+		case DMA_READ_ABORT:
+			printk(KERN_INFO "%s DMA read operation aborted:\n",
+				dev->name);
+			switch (AdapterCheckBlock[1])
+			{
+				case 0:
+					printk(KERN_INFO "Timeout\n");
+					printk(KERN_INFO "Address: %04X %04X\n",
+						AdapterCheckBlock[2],
+						AdapterCheckBlock[3]);
+					break;
+
+				case 1:
+					printk(KERN_INFO "Parity error\n");
+					printk(KERN_INFO "Address: %04X %04X\n",
+						AdapterCheckBlock[2], 
+						AdapterCheckBlock[3]);
+					break;
+
+				case 2: 
+					printk(KERN_INFO "Bus error\n");
+					printk(KERN_INFO "Address: %04X %04X\n",
+						AdapterCheckBlock[2], 
+						AdapterCheckBlock[3]);
+					break;
+
+				default:
+					printk(KERN_INFO "Unknown error.\n");
+					break;
+			}
+			break;
+
+		case DMA_WRITE_ABORT:
+			printk(KERN_INFO "%s: DMA write operation aborted: \n",
+				dev->name);
+			switch (AdapterCheckBlock[1])
+			{
+				case 0: 
+					printk(KERN_INFO "Timeout\n");
+					printk(KERN_INFO "Address: %04X %04X\n",
+						AdapterCheckBlock[2], 
+						AdapterCheckBlock[3]);
+					break;
+
+				case 1: 
+					printk(KERN_INFO "Parity error\n");
+					printk(KERN_INFO "Address: %04X %04X\n",
+						AdapterCheckBlock[2], 
+						AdapterCheckBlock[3]);
+					break;
+
+				case 2: 
+					printk(KERN_INFO "Bus error\n");
+					printk(KERN_INFO "Address: %04X %04X\n",
+						AdapterCheckBlock[2], 
+						AdapterCheckBlock[3]);
+					break;
+
+				default:
+					printk(KERN_INFO "Unknown error.\n");
+					break;
+			}
+			break;
+
+		case ILLEGAL_OP_CODE:
+			printk("%s: Illegal operation code in firmware\n",
+				dev->name);
+			/* Parm[0-3]: adapter internal register R13-R15 */
+			break;
+
+		case PARITY_ERRORS:
+			printk("%s: Adapter internal bus parity error\n",
+				dev->name);
+			/* Parm[0-3]: adapter internal register R13-R15 */
+			break;
+
+		case RAM_DATA_ERROR:
+			printk("%s: RAM data error\n", dev->name);
+			/* Parm[0-1]: MSW/LSW address of RAM location. */
+			break;
+
+		case RAM_PARITY_ERROR:
+			printk("%s: RAM parity error\n", dev->name);
+			/* Parm[0-1]: MSW/LSW address of RAM location. */
+			break;
+
+		case RING_UNDERRUN:
+			printk("%s: Internal DMA underrun detected\n",
+				dev->name);
+			break;
+
+		case INVALID_IRQ:
+			printk("%s: Unrecognized interrupt detected\n",
+				dev->name);
+			/* Parm[0-3]: adapter internal register R13-R15 */
+			break;
+
+		case INVALID_ERROR_IRQ:
+			printk("%s: Unrecognized error interrupt detected\n",
+				dev->name);
+			/* Parm[0-3]: adapter internal register R13-R15 */
+			break;
+
+		case INVALID_XOP:
+			printk("%s: Unrecognized XOP request detected\n",
+				dev->name);
+			/* Parm[0-3]: adapter internal register R13-R15 */
+			break;
+
+		default:
+			printk("%s: Unknown status", dev->name);
+			break;
+	}
+
+	if(sktr_chipset_init(dev) == 1)
+	{
+		/* Restart of firmware successful */
+		tp->AdapterOpenFlag = 1;
+	}
+
+	return;
+}
+
+/*
+ * Internal adapter pointer to RAM data are copied from adapter into
+ * host system.
+ */
+static void sktr_read_ptr(struct device *dev)
+{
+	struct net_local *tp = (struct net_local *)dev->priv;
+	unsigned short adapterram;
+
+	sktr_read_ram(dev, (unsigned char *)&tp->intptrs.BurnedInAddrPtr,
+			ADAPTER_INT_PTRS, 16);
+	sktr_read_ram(dev, (unsigned char *)&adapterram,
+			(unsigned short)SWAPB(tp->intptrs.AdapterRAMPtr), 2);
+
+	printk(KERN_INFO "%s: Adapter RAM size: %d K\n", 
+		dev->name, SWAPB(adapterram));
+
+	return;
+}
+
+/*
+ * Reads a number of bytes from adapter to system memory.
+ */
+static void sktr_read_ram(struct device *dev, unsigned char *Data,
+				unsigned short Address, int Length)
+{
+	int i;
+	unsigned short old_sifadx, old_sifadr, InWord;
+	unsigned short ioaddr = dev->base_addr;
+
+	/* Save the current values */
+	old_sifadx = inw(ioaddr + SIFADX);
+	old_sifadr = inw(ioaddr + SIFADR);
+
+	/* Page number of adapter memory */
+	outw(0x0001, ioaddr + SIFADX);
+	/* Address offset in adapter RAM */
+	outw(Address, ioaddr + SIFADR);
+
+	/* Copy len byte from adapter memory to system data area. */
+	i = 0;
+	for(;;)
+	{
+		InWord = inw(ioaddr + SIFINC);
+
+		*(Data + i) = HIBYTE(InWord);	/* Write first byte */
+		if(++i == Length)		/* All is done break */
+			break;
+
+		*(Data + i) = LOBYTE(InWord);	/* Write second byte */
+		if (++i == Length)		/* All is done break */
+			break;
+	}
+
+	/* Restore original values */
+	outw(old_sifadx, ioaddr + SIFADX);
+	outw(old_sifadr, ioaddr + SIFADR);
+
+	return;
+}
+
+/*
+ * Reads MAC address from adapter ROM.
+ */
+static void sktr_read_addr(struct device *dev, unsigned char *Address)
+{
+	int i, In;
+	unsigned short ioaddr = dev->base_addr;
+
+	/* Address: 0000:0000 */
+	outw(0, ioaddr + SIFADX);
+	outw(0, ioaddr + SIFADR);
+
+	/* Read six byte MAC address data */
+	for(i = 0; i < 6; i++)
+	{
+		In = inw(ioaddr + SIFINC);
+		*(Address + i) = (unsigned char)(In >> 8);
+	}
+
+	return;
+}
+
+/*
+ * Cancel all queued packets in the transmission queue.
+ */
+static void sktr_cancel_tx_queue(struct net_local* tp)
+{
+	TPL *tpl;
+	struct sk_buff *skb;
+
+	/*
+	 * NOTE: There must not be an active TRANSMIT command pending, when
+	 * this function is called.
+	 */
+	if(tp->TransmitCommandActive)
+		return;
+
+	for(;;)
+	{
+		tpl = tp->TplBusy;
+		if(!tpl->BusyFlag)
+			break;
+		/* "Remove" TPL from busy list. */
+		tp->TplBusy = tpl->NextTPLPtr;
+		sktr_write_tpl_status(tpl, 0);	/* Clear VALID bit */
+		tpl->BusyFlag = 0;		/* "free" TPL */
+
+		printk(KERN_INFO "Cancel tx (%08lXh).\n", (unsigned long)tpl);
+
+		dev_kfree_skb(tpl->Skb);
+	}
+
+	for(;;)
+	{
+		skb = skb_dequeue(&tp->SendSkbQueue);
+		if(skb == NULL)
+			break;
+		tp->QueueSkb++;
+		dev_kfree_skb(skb);
+	}
+
+	return;
+}
+
+/*
+ * This function is called whenever a transmit interrupt is generated by the
+ * adapter. For a command complete interrupt, it is checked if we have to
+ * issue a new transmit command or not.
+ */
+static void sktr_tx_status_irq(struct device *dev)
+{
+	struct net_local *tp = (struct net_local *)dev->priv;
+	unsigned char HighByte, HighAc, LowAc;
+	TPL *tpl;
+
+	/* NOTE: At this point the SSB from TRANSMIT STATUS is no longer
+	 * available, because the CLEAR SSB command has already been issued.
+	 *
+	 * Process all complete transmissions.
+	 */
+
+	for(;;)
+	{
+		tpl = tp->TplBusy;
+		if(!tpl->BusyFlag || (tpl->Status
+			& (TX_VALID | TX_FRAME_COMPLETE))
+			!= TX_FRAME_COMPLETE)
+		{
+			break;
+		}
+
+		/* "Remove" TPL from busy list. */
+		tp->TplBusy = tpl->NextTPLPtr ;
+
+		if(sktr_debug > 3)
+			sktr_dump(tpl->MData, SWAPB(tpl->FrameSize));
+
+		/* Check the transmit status field only for directed frames*/
+		if(DIRECTED_FRAME(tpl) && (tpl->Status & TX_ERROR) == 0)
+		{
+			HighByte = GET_TRANSMIT_STATUS_HIGH_BYTE(tpl->Status);
+			HighAc   = GET_FRAME_STATUS_HIGH_AC(HighByte);
+			LowAc    = GET_FRAME_STATUS_LOW_AC(HighByte);
+
+			if((HighAc != LowAc) || (HighAc == AC_NOT_RECOGNIZED))
+			{
+				printk(KERN_INFO "%s: (DA=%08lX not recognized)",
+					dev->name,
+					*(unsigned long *)&tpl->MData[2+2]);
+			}
+			else
+			{
+				if(sktr_debug > 3)
+					printk("%s: Directed frame tx'd\n", 
+						dev->name);
+			}
+		}
+		else
+		{
+			if(!DIRECTED_FRAME(tpl))
+			{
+				if(sktr_debug > 3)
+					printk("%s: Broadcast frame tx'd\n",
+						dev->name);
+			}
+		}
+
+                tp->MacStat.tx_packets++;
+		dev_kfree_skb(tpl->Skb);
+		tpl->BusyFlag = 0;	/* "free" TPL */
+	}
+
+	dev->tbusy = 0;
+	if(tp->QueueSkb < MAX_TX_QUEUE)
+		sktr_hardware_send_packet(dev, tp);
+
+	return;
+}
+
+/*
+ * Called if a frame receive interrupt is generated by the adapter.
+ * Check if the frame is valid and indicate it to system.
+ */
+static void sktr_rcv_status_irq(struct device *dev)
+{
+	struct net_local *tp = (struct net_local *)dev->priv;
+	unsigned char *ReceiveDataPtr;
+	struct sk_buff *skb;
+	unsigned int Length, Length2;
+	RPL *rpl;
+	RPL *SaveHead;
+
+	/* NOTE: At this point the SSB from RECEIVE STATUS is no longer
+	 * available, because the CLEAR SSB command has already been issued.
+	 *
+	 * Process all complete receives.
+	 */
+
+	for(;;)
+	{
+		rpl = tp->RplHead;
+		if(rpl->Status & RX_VALID)
+			break;		/* RPL still in use by adapter */
+
+		/* Forward RPLHead pointer to next list. */
+		SaveHead = tp->RplHead;
+		tp->RplHead = rpl->NextRPLPtr;
+
+		/* Get the frame size (Byte swap for Intel).
+		 * Do this early (see workaround comment below)
+		 */
+		Length = (unsigned short)SWAPB(rpl->FrameSize);
+
+		/* Check if the Frame_Start, Frame_End and
+		 * Frame_Complete bits are set.
+		 */
+		if((rpl->Status & VALID_SINGLE_BUFFER_FRAME)
+			== VALID_SINGLE_BUFFER_FRAME)
+		{
+			ReceiveDataPtr = rpl->MData;
+
+			/* Workaround for delayed write of FrameSize on ISA
+			 * (FrameSize is false but valid-bit is reset)
+			 * Frame size is set to zero when the RPL is freed.
+			 * Length2 is there because there have also been
+			 * cases where the FrameSize was partially written
+			 */
+			Length2 = (unsigned short)SWAPB(rpl->FrameSize);
+
+			if(Length == 0 || Length != Length2)
+			{
+				tp->RplHead = SaveHead;
+				break;	/* Return to sktr_interrupt */
+			}
+
+			/* Drop frames sent by myself */
+			if(sktr_chk_frame(dev, rpl->MData))
+			{
+				printk(KERN_INFO "%s: Received my own frame\n",
+					dev->name);
+				if(rpl->Skb != NULL)
+					dev_kfree_skb(rpl->Skb);
+			}
+			else
+			{
+				sktr_update_rcv_stats(tp,ReceiveDataPtr,Length);
+
+				if(sktr_debug > 3)
+					printk("%s: Packet Length %04X (%d)\n",
+						dev->name, Length, Length);
+
+				/* Indicate the received frame to system the
+				 * adapter does the Source-Routing padding for 
+				 * us. See: OpenOptions in sktr_init_opb()
+				 */
+				skb = rpl->Skb;
+				if(rpl->SkbStat == SKB_UNAVAILABLE)
+				{
+					/* Try again to allocate skb */
+					skb = dev_alloc_skb(tp->MaxPacketSize);
+					if(skb == NULL)
+					{
+						/* Update Stats ?? */
+					}
+					else
+					{
+						skb->dev	= dev;
+						skb_put(skb, tp->MaxPacketSize);
+						rpl->SkbStat 	= SKB_DATA_COPY;
+						ReceiveDataPtr 	= rpl->MData;
+					}
+				}
+
+				if(rpl->SkbStat == SKB_DATA_COPY
+					|| rpl->SkbStat == SKB_DMA_DIRECT)
+				{
+					if(rpl->SkbStat == SKB_DATA_COPY)
+					{
+						memmove(skb->data, ReceiveDataPtr, Length);
+					}
+
+					/* Deliver frame to system */
+					rpl->Skb = NULL;
+					skb_trim(skb,Length);
+					skb->protocol = tr_type_trans(skb,dev);
+					netif_rx(skb);
+				}
+			}
+		}
+		else	/* Invalid frame */
+		{
+			if(rpl->Skb != NULL)
+				dev_kfree_skb(rpl->Skb);
+
+			/* Skip list. */
+			if(rpl->Status & RX_START_FRAME)
+				/* Frame start bit is set -> overflow. */
+				tp->MacStat.rx_errors++;
+		}
+
+		/* Allocate new skb for rpl */
+		rpl->Skb = dev_alloc_skb(tp->MaxPacketSize);
+
+		/* skb == NULL ? then use local buffer */
+		if(rpl->Skb == NULL)
+		{
+			rpl->SkbStat = SKB_UNAVAILABLE;
+			rpl->FragList[0].DataAddr = htonl(virt_to_bus(tp->LocalRxBuffers[rpl->RPLIndex]));
+			rpl->MData = tp->LocalRxBuffers[rpl->RPLIndex];
+		}
+		else	/* skb != NULL */
+		{
+			rpl->Skb->dev = dev;
+			skb_put(rpl->Skb, tp->MaxPacketSize);
+
+			/* Data unreachable for DMA ? then use local buffer */
+			if(virt_to_bus(rpl->Skb->data) + tp->MaxPacketSize
+				> ISA_MAX_ADDRESS)
+			{
+				rpl->SkbStat = SKB_DATA_COPY;
+				rpl->FragList[0].DataAddr = htonl(virt_to_bus(tp->LocalRxBuffers[rpl->RPLIndex]));
+				rpl->MData = tp->LocalRxBuffers[rpl->RPLIndex];
+			}
+			else
+			{
+				/* DMA directly in skb->data */
+				rpl->SkbStat = SKB_DMA_DIRECT;
+				rpl->FragList[0].DataAddr = htonl(virt_to_bus(rpl->Skb->data));
+				rpl->MData = rpl->Skb->data;
+			}
+		}
+
+		rpl->FragList[0].DataCount = SWAPB(tp->MaxPacketSize);
+		rpl->FrameSize = 0;
+
+		/* Pass the last RPL back to the adapter */
+		tp->RplTail->FrameSize = 0;
+
+		/* Reset the CSTAT field in the list. */
+		sktr_write_rpl_status(tp->RplTail, RX_VALID | RX_FRAME_IRQ);
+
+		/* Current RPL becomes last one in list. */
+		tp->RplTail = tp->RplTail->NextRPLPtr;
+
+		/* Inform adapter about RPL valid. */
+		sktr_exec_sifcmd(dev, CMD_RX_VALID);
+	}
+
+	return;
+}
+
+/*
+ * This function should be used whenever the status of any RPL must be
+ * modified by the driver, because the compiler may otherwise change the
+ * order of instructions such that writing the RPL status may be executed
+ * at an undesireable time. When this function is used, the status is
+ * always written when the function is called.
+ */
+static void sktr_write_rpl_status(RPL *rpl, unsigned int Status)
+{
+	rpl->Status = Status;
+
+	return;
+}
+
+/*
+ * The function updates the statistic counters in mac->MacStat.
+ * It differtiates between directed and broadcast/multicast ( ==functional)
+ * frames.
+ */
+static void sktr_update_rcv_stats(struct net_local *tp, unsigned char DataPtr[],
+					unsigned int Length)
+{
+	tp->MacStat.rx_packets++;
+
+	/* Test functional bit */
+	if(DataPtr[2] & GROUP_BIT)
+		tp->MacStat.multicast++;
+
+	return;
+}
+
+/*
+ * Check if it is a frame of myself. Compare source address with my current
+ * address in reverse direction, and mask out the TR_RII.
+ */
+static unsigned char sktr_chk_frame(struct device *dev, unsigned char *Addr)
+{
+	int i;
+
+	for(i = 5; i > 0; i--)
+	{
+		if(Addr[8 + i] != dev->dev_addr[i])
+			return (0);
+	}
+
+	/* Mask out RIF bit. */
+	if((Addr[8] & ~TR_RII) != (unsigned char)(dev->dev_addr[0]))
+		return (0);
+
+	return (1);  /* It is my frame. */
+}
+
+/*
+ * Dump Packet (data)
+ */
+static void sktr_dump(unsigned char *Data, int length)
+{
+        int i, j;
+
+        for (i = 0, j = 0; i < length / 8; i++, j += 8)
+        {
+		printk(KERN_DEBUG "%02x %02x %02x %02x %02x %02x %02x %02x\n",
+			Data[j+0],Data[j+1],Data[j+2],Data[j+3],
+                        Data[j+4],Data[j+5],Data[j+6],Data[j+7]);
+        }
+
+        return;
+}
+
+#ifdef MODULE
+
+static struct device* dev_sktr[SKTR_MAX_ADAPTERS];
+static int io[SKTR_MAX_ADAPTERS]	= { 0, 0 };
+static int irq[SKTR_MAX_ADAPTERS] 	= { 0, 0 };
+static int mem[SKTR_MAX_ADAPTERS] 	= { 0, 0 };
+
+MODULE_PARM(io,  "1-" __MODULE_STRING(SKTR_MAX_ADAPTERS) "i");
+MODULE_PARM(irq, "1-" __MODULE_STRING(SKTR_MAX_ADAPTERS) "i");
+MODULE_PARM(mem, "1-" __MODULE_STRING(SKTR_MAX_ADAPTERS) "i");
+
+int init_module(void)
+{
+	int i;
+
+	for(i = 0; i < SKTR_MAX_ADAPTERS; i++)
+	{
+                irq[i] = 0;
+                mem[i] = 0;
+                dev_sktr[i] = NULL;
+                dev_sktr[i] = init_trdev(dev_sktr[i], 0);
+                if(dev_sktr[i] == NULL)
+                        return (-ENOMEM);
+
+		dev_sktr[i]->base_addr = io[i];
+                dev_sktr[i]->irq       = irq[i];
+                dev_sktr[i]->mem_start = mem[i];
+                dev_sktr[i]->init      = &sktr_probe;
+
+                if(register_trdev(dev_sktr[i]) != 0)
+		{
+                        kfree_s(dev_sktr[i], sizeof(struct device));
+                        dev_sktr[i] = NULL;
+                        if(i == 0)
+			{
+                                printk("sktr: register_trdev() returned non-zero.\n");
+                                return (-EIO);
+                        }
+			else
+                                return (0);
+                }
+        }
+
+        return (0);
+}
+
+void cleanup_module(void)
+{
+	int i;
+
+        for(i = 0; i < SKTR_MAX_ADAPTERS; i++)
+	{
+		if(dev_sktr[i])
+		{
+			unregister_trdev(dev_sktr[i]);
+			release_region(dev_sktr[i]->base_addr, SKTR_IO_EXTENT);
+			if(dev_sktr[i]->irq)
+				free_irq(dev_sktr[i]->irq, dev_sktr[i]);
+			if(dev_sktr[i]->dma > 0)
+				free_dma(dev_sktr[i]->dma);
+			if(dev_sktr[i]->priv)
+				kfree_s(dev_sktr[i]->priv, sizeof(struct net_local));
+			kfree_s(dev_sktr[i], sizeof(struct device));
+			dev_sktr[i] = NULL;
+                }
+	}
+}
+#endif /* MODULE */

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TCL-scripts by Sam Shen, slshen@lbl.gov