Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 2066 insertions, 0 deletions

diff --git a/drivers/net/sk_g16.c b/drivers/net/sk_g16.c
new file mode 100644
index 00000000000..134ae0e6495
--- /dev/null
+++ b/drivers/net/sk_g16.c
@@ -0,0 +1,2066 @@
+/*-
+ * Copyright (C) 1994 by PJD Weichmann & SWS Bern, Switzerland
+ *
+ * This software may be used and distributed according to the terms
+ * of the GNU General Public License, incorporated herein by reference.
+ *
+ * Module         : sk_g16.c
+ *
+ * Version        : $Revision: 1.1 $
+ *
+ * Author         : Patrick J.D. Weichmann
+ *
+ * Date Created   : 94/05/26
+ * Last Updated   : $Date: 1994/06/30 16:25:15 $
+ *
+ * Description    : Schneider & Koch G16 Ethernet Device Driver for
+ *                  Linux Kernel >= 1.1.22
+ * Update History :
+ *                  Paul Gortmaker, 03/97: Fix for v2.1.x to use read{b,w}
+ *                  write{b,w} and memcpy -> memcpy_{to,from}io
+ *
+ *		    Jeff Garzik, 06/2000, Modularize
+ *
+-*/
+
+static const char rcsid[] = "$Id: sk_g16.c,v 1.1 1994/06/30 16:25:15 root Exp $";
+
+/*
+ * The Schneider & Koch (SK) G16 Network device driver is based
+ * on the 'ni6510' driver from Michael Hipp which can be found at
+ * ftp://sunsite.unc.edu/pub/Linux/system/Network/drivers/nidrivers.tar.gz
+ * 
+ * Sources: 1) ni6510.c by M. Hipp
+ *          2) depca.c  by D.C. Davies
+ *          3) skeleton.c by D. Becker
+ *          4) Am7990 Local Area Network Controller for Ethernet (LANCE),
+ *             AMD, Pub. #05698, June 1989
+ *
+ * Many Thanks for helping me to get things working to: 
+ *                 
+ *                 A. Cox (A.Cox@swansea.ac.uk)
+ *                 M. Hipp (mhipp@student.uni-tuebingen.de)
+ *                 R. Bolz (Schneider & Koch, Germany)
+ *
+ * To Do: 
+ *        - Support of SK_G8 and other SK Network Cards.
+ *        - Autoset memory mapped RAM. Check for free memory and then
+ *          configure RAM correctly. 
+ *        - SK_close should really set card in to initial state.
+ *        - Test if IRQ 3 is not switched off. Use autoirq() functionality.
+ *          (as in /drivers/net/skeleton.c)
+ *        - Implement Multicast addressing. At minimum something like
+ *          in depca.c. 
+ *        - Redo the statistics part.
+ *        - Try to find out if the board is in 8 Bit or 16 Bit slot.
+ *          If in 8 Bit mode don't use IRQ 11.
+ *        - (Try to make it slightly faster.) 
+ *	  - Power management support
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/fcntl.h>
+#include <linux/ioport.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/string.h> 
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/bitops.h>
+
+#include <asm/system.h>
+#include <asm/io.h>
+
+#include "sk_g16.h"
+
+/* 
+ * Schneider & Koch Card Definitions 
+ * =================================
+ */  
+
+#define SK_NAME   "SK_G16"
+
+/*
+ * SK_G16 Configuration
+ * --------------------
+ */ 
+
+/* 
+ * Abbreviations
+ * -------------
+ *  
+ * RAM - used for the 16KB shared memory 
+ * Boot_ROM, ROM - are used for referencing the BootEPROM
+ *
+ * SK_BOOT_ROM and SK_ADDR are symbolic constants used to configure
+ * the behaviour of the driver and the SK_G16.
+ *
+ * ! See sk_g16.install on how to install and configure the driver !   
+ *
+ * SK_BOOT_ROM defines if the Boot_ROM should be switched off or not.
+ *
+ * SK_ADDR defines the address where the RAM will be mapped into the real
+ *         host memory.
+ *         valid addresses are from 0xa0000 to 0xfc000 in 16Kbyte steps.
+ */  
+ 
+#define SK_BOOT_ROM     1              /* 1=BootROM on 0=off */
+
+#define SK_ADDR         0xcc000
+
+/* 
+ * In POS3 are bits A14-A19 of the address bus. These bits can be set
+ * to choose the RAM address. That's why we only can choose the RAM address
+ * in 16KB steps.
+ */
+
+#define POS_ADDR       (rom_addr>>14)  /* Do not change this line */
+
+/* 
+ * SK_G16 I/O PORT's + IRQ's + Boot_ROM locations
+ * ----------------------------------------------
+ */
+
+/* 
+ * As nearly every card has also SK_G16 a specified I/O Port region and
+ * only a few possible IRQ's.
+ * In the Installation Guide from Schneider & Koch is listed a possible
+ * Interrupt IRQ2. IRQ2 is always IRQ9 in boards with two cascaded interrupt
+ * controllers. So we use in SK_IRQS IRQ9.
+ */
+
+/* Don't touch any of the following #defines. */
+
+#define SK_IO_PORTS     { 0x100, 0x180, 0x208, 0x220, 0x288, 0x320, 0x328, 0x390, 0 }
+
+#define SK_IRQS         { 3, 5, 9, 11, 0 }
+
+#define SK_BOOT_ROM_LOCATIONS { 0xc0000, 0xc4000, 0xc8000, 0xcc000, 0xd0000, 0xd4000, 0xd8000, 0xdc000, 0 }
+
+#define SK_BOOT_ROM_ID  { 0x55, 0xaa, 0x10, 0x50, 0x06, 0x33 }
+
+/* 
+ * SK_G16 POS REGISTERS 
+ * --------------------
+ */
+
+/*
+ * SK_G16 has a Programmable Option Select (POS) Register.
+ * The POS is composed of 8 separate registers (POS0-7) which 
+ * are I/O mapped on an address set by the W1 switch.                    
+ *
+ */
+
+#define SK_POS_SIZE 8           /* 8 I/O Ports are used by SK_G16 */
+
+#define SK_POS0     ioaddr      /* Card-ID Low (R) */
+#define SK_POS1     ioaddr+1    /* Card-ID High (R) */
+#define SK_POS2     ioaddr+2    /* Card-Enable, Boot-ROM Disable (RW) */
+#define SK_POS3     ioaddr+3    /* Base address of RAM */
+#define SK_POS4     ioaddr+4    /* IRQ */
+
+/* POS5 - POS7 are unused */
+
+/* 
+ * SK_G16 MAC PREFIX 
+ * -----------------
+ */
+
+/* 
+ * Scheider & Koch manufacturer code (00:00:a5).
+ * This must be checked, that we are sure it is a SK card.
+ */
+
+#define SK_MAC0         0x00
+#define SK_MAC1         0x00
+#define SK_MAC2         0x5a
+
+/* 
+ * SK_G16 ID 
+ * ---------
+ */ 
+
+/* 
+ * If POS0,POS1 contain the following ID, then we know
+ * at which I/O Port Address we are. 
+ */
+
+#define SK_IDLOW  0xfd 
+#define SK_IDHIGH 0x6a
+
+
+/* 
+ * LANCE POS Bit definitions 
+ * -------------------------
+ */
+
+#define SK_ROM_RAM_ON  (POS2_CARD)
+#define SK_ROM_RAM_OFF (POS2_EPROM)
+#define SK_ROM_ON      (inb(SK_POS2) & POS2_CARD)
+#define SK_ROM_OFF     (inb(SK_POS2) | POS2_EPROM)
+#define SK_RAM_ON      (inb(SK_POS2) | POS2_CARD)
+#define SK_RAM_OFF     (inb(SK_POS2) & POS2_EPROM) 
+
+#define POS2_CARD  0x0001              /* 1 = SK_G16 on      0 = off */
+#define POS2_EPROM 0x0002              /* 1 = Boot EPROM off 0 = on */ 
+
+/* 
+ * SK_G16 Memory mapped Registers
+ * ------------------------------
+ *
+ */ 
+
+#define SK_IOREG        (&board->ioreg) /* LANCE data registers.     */ 
+#define SK_PORT         (&board->port)  /* Control, Status register  */
+#define SK_IOCOM        (&board->iocom) /* I/O Command               */
+
+/* 
+ * SK_G16 Status/Control Register bits
+ * -----------------------------------
+ *
+ * (C) Controlreg (S) Statusreg 
+ */
+
+/* 
+ * Register transfer: 0 = no transfer
+ *                    1 = transferring data between LANCE and I/O reg 
+ */
+#define SK_IORUN        0x20   
+
+/* 
+ * LANCE interrupt: 0 = LANCE interrupt occurred	
+ *                  1 = no LANCE interrupt occurred
+ */
+#define SK_IRQ          0x10   
+			
+#define SK_RESET        0x08   /* Reset SK_CARD: 0 = RESET 1 = normal */
+#define SK_RW           0x02   /* 0 = write to 1 = read from */
+#define SK_ADR          0x01   /* 0 = REG DataPort 1 = RAP Reg addr port */
+
+  
+#define SK_RREG         SK_RW  /* Transferdirection to read from lance */
+#define SK_WREG         0      /* Transferdirection to write to lance */
+#define SK_RAP          SK_ADR /* Destination Register RAP */
+#define SK_RDATA        0      /* Destination Register REG DataPort */
+
+/* 
+ * SK_G16 I/O Command 
+ * ------------------
+ */
+
+/* 
+ * Any bitcombination sets the internal I/O bit (transfer will start) 
+ * when written to I/O Command
+ */
+
+#define SK_DOIO         0x80   /* Do Transfer */ 
+ 
+/* 
+ * LANCE RAP (Register Address Port). 
+ * ---------------------------------
+ */
+
+/*   
+ * The LANCE internal registers are selected through the RAP. 
+ * The Registers are:
+ *
+ * CSR0 - Status and Control flags 
+ * CSR1 - Low order bits of initialize block (bits 15:00)
+ * CSR2 - High order bits of initialize block (bits 07:00, 15:08 are reserved)
+ * CSR3 - Allows redefinition of the Bus Master Interface.
+ *        This register must be set to 0x0002, which means BSWAP = 0,
+ *        ACON = 1, BCON = 0;
+ *
+ */
+ 
+#define CSR0            0x00   
+#define CSR1            0x01  
+#define CSR2            0x02 
+#define CSR3            0x03
+
+/* 
+ * General Definitions 
+ * ===================
+ */
+
+/* 
+ * Set the number of Tx and Rx buffers, using Log_2(# buffers).
+ * We have 16KB RAM which can be accessed by the LANCE. In the 
+ * memory are not only the buffers but also the ring descriptors and
+ * the initialize block. 
+ * Don't change anything unless you really know what you do.
+ */
+
+#define LC_LOG_TX_BUFFERS 1               /* (2 == 2^^1) 2 Transmit buffers */
+#define LC_LOG_RX_BUFFERS 3               /* (8 == 2^^3) 8 Receive buffers */
+
+/* Descriptor ring sizes */
+
+#define TMDNUM (1 << (LC_LOG_TX_BUFFERS)) /* 2 Transmit descriptor rings */
+#define RMDNUM (1 << (LC_LOG_RX_BUFFERS)) /* 8 Receive Buffers */
+
+/* Define Mask for setting RMD, TMD length in the LANCE init_block */
+
+#define TMDNUMMASK (LC_LOG_TX_BUFFERS << 29)
+#define RMDNUMMASK (LC_LOG_RX_BUFFERS << 29)
+
+/*
+ * Data Buffer size is set to maximum packet length.
+ */
+
+#define PKT_BUF_SZ              1518 
+
+/* 
+ * The number of low I/O ports used by the ethercard. 
+ */
+
+#define ETHERCARD_TOTAL_SIZE    SK_POS_SIZE
+
+/* 
+ * SK_DEBUG
+ *
+ * Here you can choose what level of debugging wanted.
+ *
+ * If SK_DEBUG and SK_DEBUG2 are undefined, then only the
+ *  necessary messages will be printed.
+ *
+ * If SK_DEBUG is defined, there will be many debugging prints
+ *  which can help to find some mistakes in configuration or even
+ *  in the driver code.
+ *
+ * If SK_DEBUG2 is defined, many many messages will be printed 
+ *  which normally you don't need. I used this to check the interrupt
+ *  routine. 
+ *
+ * (If you define only SK_DEBUG2 then only the messages for 
+ *  checking interrupts will be printed!)
+ *
+ * Normal way of live is: 
+ *
+ * For the whole thing get going let both symbolic constants
+ * undefined. If you face any problems and you know what's going
+ * on (you know something about the card and you can interpret some
+ * hex LANCE register output) then define SK_DEBUG
+ * 
+ */
+
+#undef  SK_DEBUG	/* debugging */
+#undef  SK_DEBUG2	/* debugging with more verbose report */
+
+#ifdef SK_DEBUG
+#define PRINTK(x) printk x
+#else
+#define PRINTK(x) /**/
+#endif
+
+#ifdef SK_DEBUG2
+#define PRINTK2(x) printk x
+#else
+#define PRINTK2(x) /**/
+#endif
+
+/* 
+ * SK_G16 RAM
+ *
+ * The components are memory mapped and can be set in a region from
+ * 0x00000 through 0xfc000 in 16KB steps. 
+ *
+ * The Network components are: dual ported RAM, Prom, I/O Reg, Status-,
+ * Controlregister and I/O Command.
+ *
+ * dual ported RAM: This is the only memory region which the LANCE chip
+ *      has access to. From the Lance it is addressed from 0x0000 to
+ *      0x3fbf. The host accesses it normally.
+ *
+ * PROM: The PROM obtains the ETHERNET-MAC-Address. It is realised as a
+ *       8-Bit PROM, this means only the 16 even addresses are used of the
+ *       32 Byte Address region. Access to an odd address results in invalid
+ *       data.
+ * 
+ * LANCE I/O Reg: The I/O Reg is build of 4 single Registers, Low-Byte Write,
+ *       Hi-Byte Write, Low-Byte Read, Hi-Byte Read.
+ *       Transfer from or to the LANCE is always in 16Bit so Low and High
+ *       registers are always relevant.
+ *
+ *       The Data from the Readregister is not the data in the Writeregister!!
+ *       
+ * Port: Status- and Controlregister. 
+ *       Two different registers which share the same address, Status is 
+ *       read-only, Control is write-only.
+ *    
+ * I/O Command: 
+ *       Any bitcombination written in here starts the transmission between
+ *       Host and LANCE.
+ */
+
+typedef struct
+{
+	unsigned char  ram[0x3fc0];   /* 16KB dual ported ram */
+	unsigned char  rom[0x0020];   /* 32Byte PROM containing 6Byte MAC */
+	unsigned char  res1[0x0010];  /* reserved */
+	unsigned volatile short ioreg;/* LANCE I/O Register */
+	unsigned volatile char  port; /* Statusregister and Controlregister */
+	unsigned char  iocom;         /* I/O Command Register */
+} SK_RAM;
+
+/* struct  */
+
+/* 
+ * This is the structure for the dual ported ram. We
+ * have exactly 16 320 Bytes. In here there must be:
+ *
+ *     - Initialize Block   (starting at a word boundary)
+ *     - Receive and Transmit Descriptor Rings (quadword boundary)
+ *     - Data Buffers (arbitrary boundary)
+ *
+ * This is because LANCE has on SK_G16 only access to the dual ported
+ * RAM and nowhere else.
+ */
+
+struct SK_ram
+{
+    struct init_block ib;
+    struct tmd tmde[TMDNUM];
+    struct rmd rmde[RMDNUM];
+    char tmdbuf[TMDNUM][PKT_BUF_SZ];
+    char rmdbuf[RMDNUM][PKT_BUF_SZ];
+};
+
+/* 
+ * Structure where all necessary information is for ring buffer 
+ * management and statistics.
+ */
+
+struct priv
+{
+    struct SK_ram *ram;  /* dual ported ram structure */
+    struct rmd *rmdhead; /* start of receive ring descriptors */
+    struct tmd *tmdhead; /* start of transmit ring descriptors */
+    int        rmdnum;   /* actual used ring descriptor */
+    int        tmdnum;   /* actual transmit descriptor for transmitting data */
+    int        tmdlast;  /* last sent descriptor used for error handling, etc */
+    void       *rmdbufs[RMDNUM]; /* pointer to the receive buffers */
+    void       *tmdbufs[TMDNUM]; /* pointer to the transmit buffers */
+    struct net_device_stats stats; /* Device driver statistics */
+};
+
+/* global variable declaration */
+
+/* IRQ map used to reserve a IRQ (see SK_open()) */
+
+/* static variables */
+
+static SK_RAM *board;  /* pointer to our memory mapped board components */
+static DEFINE_SPINLOCK(SK_lock);
+
+/* Macros */
+
+
+/* Function Prototypes */
+
+/*
+ * Device Driver functions
+ * -----------------------
+ * See for short explanation of each function its definitions header.
+ */
+
+static int   SK_probe(struct net_device *dev, short ioaddr);
+
+static void  SK_timeout(struct net_device *dev);
+static int   SK_open(struct net_device *dev);
+static int   SK_send_packet(struct sk_buff *skb, struct net_device *dev);
+static irqreturn_t SK_interrupt(int irq, void *dev_id, struct pt_regs * regs);
+static void  SK_rxintr(struct net_device *dev);
+static void  SK_txintr(struct net_device *dev);
+static int   SK_close(struct net_device *dev);
+
+static struct net_device_stats *SK_get_stats(struct net_device *dev);
+
+unsigned int SK_rom_addr(void);
+
+static void set_multicast_list(struct net_device *dev);
+
+/*
+ * LANCE Functions
+ * ---------------
+ */
+
+static int SK_lance_init(struct net_device *dev, unsigned short mode);
+void   SK_reset_board(void);
+void   SK_set_RAP(int reg_number);
+int    SK_read_reg(int reg_number);
+int    SK_rread_reg(void);
+void   SK_write_reg(int reg_number, int value);
+
+/* 
+ * Debugging functions
+ * -------------------
+ */
+
+void SK_print_pos(struct net_device *dev, char *text);
+void SK_print_dev(struct net_device *dev, char *text);
+void SK_print_ram(struct net_device *dev);
+
+
+/*-
+ * Function       : SK_init
+ * Author         : Patrick J.D. Weichmann
+ * Date Created   : 94/05/26
+ *
+ * Description    : Check for a SK_G16 network adaptor and initialize it.
+ *                  This function gets called by dev_init which initializes
+ *                  all Network devices.
+ *
+ * Parameters     : I : struct net_device *dev - structure preconfigured 
+ *                                           from Space.c
+ * Return Value   : 0 = Driver Found and initialized 
+ * Errors         : ENODEV - no device found
+ *                  ENXIO  - not probed
+ * Globals        : None
+ * Update History :
+ *     YY/MM/DD  uid  Description
+-*/
+
+static int io;	/* 0 == probe */
+
+/* 
+ * Check for a network adaptor 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.
+ */
+
+struct net_device * __init SK_init(int unit)
+{
+	int *port, ports[] = SK_IO_PORTS;  /* SK_G16 supported ports */
+	static unsigned version_printed;
+	struct net_device *dev = alloc_etherdev(sizeof(struct priv));
+	int err = -ENODEV;
+
+	if (!dev)
+		return ERR_PTR(-ENOMEM);
+
+	if (unit >= 0) {
+		sprintf(dev->name, "eth%d", unit);
+		netdev_boot_setup_check(dev);
+		io = dev->base_addr;
+	}
+
+	if (version_printed++ == 0)
+	        PRINTK(("%s: %s", SK_NAME, rcsid));
+
+	if (io > 0xff) {        /* Check a single specified address */
+		err = -EBUSY;
+		/* Check if on specified address is a SK_G16 */
+		if (request_region(io, ETHERCARD_TOTAL_SIZE, "sk_g16")) {
+			err = SK_probe(dev, io);
+			if (!err)
+				goto got_it;
+			release_region(io, ETHERCARD_TOTAL_SIZE);
+		}
+	} else if (io > 0) {       /* Don't probe at all */
+		err = -ENXIO;
+	} else {
+		/* Autoprobe base_addr */
+		for (port = &ports[0]; *port; port++) {
+			io = *port;
+
+			/* Check if I/O Port region is used by another board */
+			if (!request_region(io, ETHERCARD_TOTAL_SIZE, "sk_g16"))
+				continue;       /* Try next Port address */
+
+			/* Check if at ioaddr is a SK_G16 */
+			if (SK_probe(dev, io) == 0)
+				goto got_it;
+
+			release_region(io, ETHERCARD_TOTAL_SIZE);
+		}
+	}
+err_out:
+	free_netdev(dev);
+	return ERR_PTR(err);
+
+got_it:
+	err = register_netdev(dev);
+	if (err) {
+		release_region(dev->base_addr, ETHERCARD_TOTAL_SIZE);
+		goto err_out;
+	}
+	return dev;
+
+} /* End of SK_init */
+
+
+MODULE_AUTHOR("Patrick J.D. Weichmann");
+MODULE_DESCRIPTION("Schneider & Koch G16 Ethernet Device Driver");
+MODULE_LICENSE("GPL");
+MODULE_PARM(io, "i");
+MODULE_PARM_DESC(io, "0 to probe common ports (unsafe), or the I/O base of the board");
+
+
+#ifdef MODULE
+
+static struct net_device *SK_dev;
+
+static int __init SK_init_module (void)
+{
+ 	SK_dev = SK_init(-1);
+ 	return IS_ERR(SK_dev) ? PTR_ERR(SK_dev) : 0;
+}
+
+static void __exit SK_cleanup_module (void)
+{
+ 	unregister_netdev(SK_dev);
+ 	release_region(SK_dev->base_addr, ETHERCARD_TOTAL_SIZE);
+ 	free_netdev(SK_dev);
+}
+
+module_init(SK_init_module);
+module_exit(SK_cleanup_module);
+#endif
+
+
+/*-
+ * Function       : SK_probe
+ * Author         : Patrick J.D. Weichmann
+ * Date Created   : 94/05/26
+ *
+ * Description    : This function is called by SK_init and 
+ *                  does the main part of initialization.
+ *                  
+ * Parameters     : I : struct net_device *dev - SK_G16 device structure
+ *                  I : short ioaddr       - I/O Port address where POS is.
+ * Return Value   : 0 = Initialization done             
+ * Errors         : ENODEV - No SK_G16 found
+ *                  -1     - Configuration problem
+ * Globals        : board       - pointer to SK_RAM
+ * Update History :
+ *     YY/MM/DD  uid  Description
+ *     94/06/30  pwe  SK_ADDR now checked and at the correct place
+-*/
+
+int __init SK_probe(struct net_device *dev, short ioaddr)
+{
+    int i,j;                /* Counters */
+    int sk_addr_flag = 0;   /* SK ADDR correct? 1 - no, 0 - yes */
+    unsigned int rom_addr;  /* used to store RAM address used for POS_ADDR */
+
+    struct priv *p = netdev_priv(dev);	/* SK_G16 private structure */
+
+    if (inb(SK_POS0) != SK_IDLOW || inb(SK_POS1) != SK_IDHIGH)
+	return -ENODEV;
+    dev->base_addr = ioaddr;
+
+    if (SK_ADDR & 0x3fff || SK_ADDR < 0xa0000)
+    {
+      
+       sk_addr_flag = 1;
+
+       /* 
+        * Now here we could use a routine which searches for a free
+        * place in the ram and set SK_ADDR if found. TODO. 
+        */
+    }
+
+    if (SK_BOOT_ROM)            /* Shall we keep Boot_ROM on ? */
+    {
+        PRINTK(("## %s: SK_BOOT_ROM is set.\n", SK_NAME));
+
+        rom_addr = SK_rom_addr();
+
+	if (rom_addr == 0)      /* No Boot_ROM found */
+	{
+            if (sk_addr_flag)   /* No or Invalid SK_ADDR is defined */ 
+            {
+                printk("%s: SK_ADDR %#08x is not valid. Check configuration.\n",
+                       dev->name, SK_ADDR);
+                return -1;
+            }
+
+	    rom_addr = SK_ADDR; /* assign predefined address */
+
+	    PRINTK(("## %s: NO Bootrom found \n", SK_NAME));
+
+	    outb(SK_ROM_RAM_OFF, SK_POS2); /* Boot_ROM + RAM off */
+	    outb(POS_ADDR, SK_POS3);       /* Set RAM address */
+	    outb(SK_RAM_ON, SK_POS2);      /* enable RAM */
+	}
+	else if (rom_addr == SK_ADDR) 
+	{
+            printk("%s: RAM + ROM are set to the same address %#08x\n"
+                   "   Check configuration. Now switching off Boot_ROM\n",
+                   SK_NAME, rom_addr);
+
+	    outb(SK_ROM_RAM_OFF, SK_POS2); /* Boot_ROM + RAM off*/
+	    outb(POS_ADDR, SK_POS3);       /* Set RAM address */
+	    outb(SK_RAM_ON, SK_POS2);      /* enable RAM */
+	}
+	else
+	{
+            PRINTK(("## %s: Found ROM at %#08x\n", SK_NAME, rom_addr));
+	    PRINTK(("## %s: Keeping Boot_ROM on\n", SK_NAME));
+
+            if (sk_addr_flag)       /* No or Invalid SK_ADDR is defined */ 
+            {
+                printk("%s: SK_ADDR %#08x is not valid. Check configuration.\n",
+                       dev->name, SK_ADDR);
+                return -1;
+            }
+
+	    rom_addr = SK_ADDR;
+
+	    outb(SK_ROM_RAM_OFF, SK_POS2); /* Boot_ROM + RAM off */ 
+	    outb(POS_ADDR, SK_POS3);       /* Set RAM address */
+	    outb(SK_ROM_RAM_ON, SK_POS2);  /* RAM on, BOOT_ROM on */
+	}
+    }
+    else /* Don't keep Boot_ROM */
+    {
+        PRINTK(("## %s: SK_BOOT_ROM is not set.\n", SK_NAME));
+
+        if (sk_addr_flag)           /* No or Invalid SK_ADDR is defined */ 
+        {
+            printk("%s: SK_ADDR %#08x is not valid. Check configuration.\n",
+                   dev->name, SK_ADDR);
+            return -1;
+        }
+
+	rom_addr = SK_rom_addr();          /* Try to find a Boot_ROM */
+
+	/* IF we find a Boot_ROM disable it */
+
+	outb(SK_ROM_RAM_OFF, SK_POS2);     /* Boot_ROM + RAM off */  
+
+        /* We found a Boot_ROM and it's gone. Set RAM address on
+         * Boot_ROM address. 
+         */ 
+
+	if (rom_addr) 
+	{
+            printk("%s: We found Boot_ROM at %#08x. Now setting RAM on"
+                   "that address\n", SK_NAME, rom_addr);
+
+	    outb(POS_ADDR, SK_POS3);       /* Set RAM on Boot_ROM address */
+	}
+	else /* We did not find a Boot_ROM, use predefined SK_ADDR for ram */
+	{
+            if (sk_addr_flag)       /* No or Invalid SK_ADDR is defined */ 
+            {
+                printk("%s: SK_ADDR %#08x is not valid. Check configuration.\n",
+                       dev->name, SK_ADDR);
+                return -1;
+            }
+
+	    rom_addr = SK_ADDR;
+
+	    outb(POS_ADDR, SK_POS3);       /* Set RAM address */ 
+	}
+	outb(SK_RAM_ON, SK_POS2);          /* enable RAM */
+    }
+
+#ifdef SK_DEBUG
+    SK_print_pos(dev, "POS registers after ROM, RAM config");
+#endif
+
+    board = (SK_RAM *) isa_bus_to_virt(rom_addr);
+
+    /* Read in station address */
+    for (i = 0, j = 0; i < ETH_ALEN; i++, j+=2)
+    {
+	dev->dev_addr[i] = readb(board->rom+j);          
+    }
+
+    /* Check for manufacturer code */
+    if (!(dev->dev_addr[0] == SK_MAC0 &&
+	  dev->dev_addr[1] == SK_MAC1 &&
+	  dev->dev_addr[2] == SK_MAC2) )
+    {
+        PRINTK(("## %s: We did not find SK_G16 at RAM location.\n",
+                SK_NAME)); 
+	return -ENODEV;                     /* NO SK_G16 found */
+    }
+
+    printk("%s: %s found at %#3x, HW addr: %#04x:%02x:%02x:%02x:%02x:%02x\n",
+	    dev->name,
+	    "Schneider & Koch Netcard",
+	    (unsigned int) dev->base_addr,
+	    dev->dev_addr[0],
+	    dev->dev_addr[1],
+	    dev->dev_addr[2],
+	    dev->dev_addr[3],
+	    dev->dev_addr[4],
+	    dev->dev_addr[5]);
+
+    memset((char *) dev->priv, 0, sizeof(struct priv)); /* clear memory */
+
+    /* Assign our Device Driver functions */
+
+    dev->open                   = SK_open;
+    dev->stop                   = SK_close;
+    dev->hard_start_xmit        = SK_send_packet;
+    dev->get_stats              = SK_get_stats;
+    dev->set_multicast_list     = set_multicast_list;
+    dev->tx_timeout		= SK_timeout;
+    dev->watchdog_timeo		= HZ/7;
+
+
+    dev->flags &= ~IFF_MULTICAST;
+
+    /* Initialize private structure */
+
+    p->ram = (struct SK_ram *) rom_addr; /* Set dual ported RAM addr */
+    p->tmdhead = &(p->ram)->tmde[0];     /* Set TMD head */
+    p->rmdhead = &(p->ram)->rmde[0];     /* Set RMD head */
+
+    /* Initialize buffer pointers */
+
+    for (i = 0; i < TMDNUM; i++)
+    {
+	p->tmdbufs[i] = &(p->ram)->tmdbuf[i];
+    }
+
+    for (i = 0; i < RMDNUM; i++)
+    {
+	p->rmdbufs[i] = &(p->ram)->rmdbuf[i]; 
+    }
+
+#ifdef SK_DEBUG
+    SK_print_pos(dev, "End of SK_probe");
+    SK_print_ram(dev);
+#endif 
+    return 0;                            /* Initialization done */
+} /* End of SK_probe() */
+
+
+/*- 
+ * Function       : SK_open
+ * Author         : Patrick J.D. Weichmann
+ * Date Created   : 94/05/26
+ *
+ * Description    : This function is called sometimes after booting 
+ *                  when ifconfig program is run.
+ *
+ *                  This function requests an IRQ, sets the correct
+ *                  IRQ in the card. Then calls SK_lance_init() to 
+ *                  init and start the LANCE chip. Then if everything is 
+ *                  ok returns with 0 (OK), which means SK_G16 is now
+ *                  opened and operational.
+ *
+ *                  (Called by dev_open() /net/inet/dev.c)
+ *
+ * Parameters     : I : struct net_device *dev - SK_G16 device structure
+ * Return Value   : 0 - Device opened
+ * Errors         : -EAGAIN - Open failed
+ * Side Effects   : None
+ * Update History :
+ *     YY/MM/DD  uid  Description
+-*/
+
+static int SK_open(struct net_device *dev)
+{
+    int i = 0;
+    int irqval = 0;
+    int ioaddr = dev->base_addr;
+
+    int irqtab[] = SK_IRQS; 
+
+    struct priv *p = netdev_priv(dev);
+
+    PRINTK(("## %s: At beginning of SK_open(). CSR0: %#06x\n", 
+           SK_NAME, SK_read_reg(CSR0)));
+
+    if (dev->irq == 0) /* Autoirq */
+    {
+	i = 0;
+
+	/* 
+         * Check if one IRQ out of SK_IRQS is free and install 
+	 * interrupt handler.
+	 * Most done by request_irq(). 
+	 * irqval: 0       - interrupt handler installed for IRQ irqtab[i]
+	 *         -EBUSY  - interrupt busy 
+         *         -EINVAL - irq > 15 or handler = NULL
+	 */
+
+	do
+	{
+	  irqval = request_irq(irqtab[i], &SK_interrupt, 0, "sk_g16", dev);
+	  i++;
+	} while (irqval && irqtab[i]);
+
+	if (irqval) /* We tried every possible IRQ but no success */
+	{
+	    printk("%s: unable to get an IRQ\n", dev->name);
+	    return -EAGAIN;
+	}
+
+	dev->irq = irqtab[--i]; 
+	
+	outb(i<<2, SK_POS4);           /* Set Card on probed IRQ */
+
+    }
+    else if (dev->irq == 2) /* IRQ2 is always IRQ9 */
+    {
+	if (request_irq(9, &SK_interrupt, 0, "sk_g16", dev))
+	{
+	    printk("%s: unable to get IRQ 9\n", dev->name);
+	    return -EAGAIN;
+	} 
+	dev->irq = 9;
+	
+        /* 
+         * Now we set card on IRQ2.
+         * This can be confusing, but remember that IRQ2 on the network
+         * card is in reality IRQ9
+         */
+	outb(0x08, SK_POS4);           /* set card to IRQ2 */
+
+    }
+    else  /* Check IRQ as defined in Space.c */
+    {
+	int i = 0;
+
+	/* check if IRQ free and valid. Then install Interrupt handler */
+
+	if (request_irq(dev->irq, &SK_interrupt, 0, "sk_g16", dev))
+	{
+	    printk("%s: unable to get selected IRQ\n", dev->name);
+	    return -EAGAIN;
+	}
+
+	switch(dev->irq)
+	{
+	    case 3: i = 0;
+		    break;
+	    case 5: i = 1;
+		    break;
+	    case 2: i = 2;
+		    break;
+	    case 11:i = 3;
+		    break;
+	    default: 
+		printk("%s: Preselected IRQ %d is invalid for %s boards",
+		       dev->name,
+		       dev->irq,
+                       SK_NAME);
+		return -EAGAIN;
+	}      
+  
+	outb(i<<2, SK_POS4);           /* Set IRQ on card */
+    }
+
+    printk("%s: Schneider & Koch G16 at %#3x, IRQ %d, shared mem at %#08x\n",
+	    dev->name, (unsigned int)dev->base_addr, 
+	    (int) dev->irq, (unsigned int) p->ram);
+
+    if (!(i = SK_lance_init(dev, 0)))  /* LANCE init OK? */
+    {
+	netif_start_queue(dev);
+
+#ifdef SK_DEBUG
+
+        /* 
+         * This debug block tries to stop LANCE,
+         * reinit LANCE with transmitter and receiver disabled,
+         * then stop again and reinit with NORMAL_MODE
+         */
+
+        printk("## %s: After lance init. CSR0: %#06x\n", 
+               SK_NAME, SK_read_reg(CSR0));
+        SK_write_reg(CSR0, CSR0_STOP);
+        printk("## %s: LANCE stopped. CSR0: %#06x\n", 
+               SK_NAME, SK_read_reg(CSR0));
+        SK_lance_init(dev, MODE_DTX | MODE_DRX);
+        printk("## %s: Reinit with DTX + DRX off. CSR0: %#06x\n", 
+               SK_NAME, SK_read_reg(CSR0));
+        SK_write_reg(CSR0, CSR0_STOP);
+        printk("## %s: LANCE stopped. CSR0: %#06x\n", 
+               SK_NAME, SK_read_reg(CSR0));
+        SK_lance_init(dev, MODE_NORMAL);
+        printk("## %s: LANCE back to normal mode. CSR0: %#06x\n", 
+               SK_NAME, SK_read_reg(CSR0));
+        SK_print_pos(dev, "POS regs before returning OK");
+
+#endif /* SK_DEBUG */
+       
+	return 0;              /* SK_open() is successful */
+    }
+    else /* LANCE init failed */
+    {
+
+	PRINTK(("## %s: LANCE init failed: CSR0: %#06x\n", 
+               SK_NAME, SK_read_reg(CSR0)));
+
+	return -EAGAIN;
+    }
+
+} /* End of SK_open() */
+
+
+/*-
+ * Function       : SK_lance_init
+ * Author         : Patrick J.D. Weichmann
+ * Date Created   : 94/05/26
+ *
+ * Description    : Reset LANCE chip, fill RMD, TMD structures with
+ *                  start values and Start LANCE.
+ *
+ * Parameters     : I : struct net_device *dev - SK_G16 device structure
+ *                  I : int mode - put LANCE into "mode" see data-sheet for
+ *                                 more info.
+ * Return Value   : 0  - Init done
+ * Errors         : -1 - Init failed
+ * Update History :
+ *     YY/MM/DD  uid  Description
+-*/
+
+static int SK_lance_init(struct net_device *dev, unsigned short mode)
+{
+    int i;
+    unsigned long flags;
+    struct priv *p = netdev_priv(dev);
+    struct tmd  *tmdp;
+    struct rmd  *rmdp;
+
+    PRINTK(("## %s: At beginning of LANCE init. CSR0: %#06x\n", 
+           SK_NAME, SK_read_reg(CSR0)));
+
+    /* Reset LANCE */
+    SK_reset_board();
+
+    /* Initialize TMD's with start values */
+    p->tmdnum = 0;                   /* First descriptor for transmitting */ 
+    p->tmdlast = 0;                  /* First descriptor for reading stats */
+
+    for (i = 0; i < TMDNUM; i++)     /* Init all TMD's */
+    {
+	tmdp = p->tmdhead + i; 
+   
+	writel((unsigned long) p->tmdbufs[i], tmdp->u.buffer); /* assign buffer */
+	
+	/* Mark TMD as start and end of packet */
+	writeb(TX_STP | TX_ENP, &tmdp->u.s.status);
+    }
+
+
+    /* Initialize RMD's with start values */
+
+    p->rmdnum = 0;                   /* First RMD which will be used */
+ 
+    for (i = 0; i < RMDNUM; i++)     /* Init all RMD's */
+    {
+	rmdp = p->rmdhead + i;
+
+	
+	writel((unsigned long) p->rmdbufs[i], rmdp->u.buffer); /* assign buffer */
+	
+	/* 
+         * LANCE must be owner at beginning so that he can fill in 
+	 * receiving packets, set status and release RMD 
+	 */
+
+	writeb(RX_OWN, &rmdp->u.s.status);
+
+	writew(-PKT_BUF_SZ, &rmdp->blen); /* Buffer Size (two's complement) */
+
+	writeb(0, &rmdp->mlen);           /* init message length */       
+	
+    }
+
+    /* Fill LANCE Initialize Block */
+
+    writew(mode, (&((p->ram)->ib.mode))); /* Set operation mode */
+
+    for (i = 0; i < ETH_ALEN; i++)   /* Set physical address */
+    {
+	writeb(dev->dev_addr[i], (&((p->ram)->ib.paddr[i]))); 
+    }
+
+    for (i = 0; i < 8; i++)          /* Set multicast, logical address */
+    {
+	writeb(0, (&((p->ram)->ib.laddr[i]))); /* We do not use logical addressing */
+    } 
+
+    /* Set ring descriptor pointers and set number of descriptors */
+
+    writel((int)p->rmdhead | RMDNUMMASK, (&((p->ram)->ib.rdrp)));
+    writel((int)p->tmdhead | TMDNUMMASK, (&((p->ram)->ib.tdrp)));
+
+    /* Prepare LANCE Control and Status Registers */
+
+    spin_lock_irqsave(&SK_lock, flags);
+
+    SK_write_reg(CSR3, CSR3_ACON);   /* Ale Control !!!THIS MUST BE SET!!!! */
+ 
+    /* 
+     * LANCE addresses the RAM from 0x0000 to 0x3fbf and has no access to
+     * PC Memory locations.
+     *
+     * In structure SK_ram is defined that the first thing in ram
+     * is the initialization block. So his address is for LANCE always
+     * 0x0000
+     *
+     * CSR1 contains low order bits 15:0 of initialization block address
+     * CSR2 is built of: 
+     *    7:0  High order bits 23:16 of initialization block address
+     *   15:8  reserved, must be 0
+     */
+    
+    /* Set initialization block address (must be on word boundary) */
+    SK_write_reg(CSR1, 0);          /* Set low order bits 15:0 */
+    SK_write_reg(CSR2, 0);          /* Set high order bits 23:16 */ 
+    
+
+    PRINTK(("## %s: After setting CSR1-3. CSR0: %#06x\n", 
+           SK_NAME, SK_read_reg(CSR0)));
+
+    /* Initialize LANCE */
+
+    /* 
+     * INIT = Initialize, when set, causes the LANCE to begin the
+     * initialization procedure and access the Init Block.
+     */
+
+    SK_write_reg(CSR0, CSR0_INIT); 
+
+    spin_unlock_irqrestore(&SK_lock, flags);
+
+    /* Wait until LANCE finished initialization */
+    
+    SK_set_RAP(CSR0);              /* Register Address Pointer to CSR0 */
+
+    for (i = 0; (i < 100) && !(SK_rread_reg() & CSR0_IDON); i++) 
+	; /* Wait until init done or go ahead if problems (i>=100) */
+
+    if (i >= 100) /* Something is wrong ! */
+    {
+	printk("%s: can't init am7990, status: %04x "
+	       "init_block: %#08x\n", 
+		dev->name, (int) SK_read_reg(CSR0), 
+		(unsigned int) &(p->ram)->ib);
+
+#ifdef SK_DEBUG
+	SK_print_pos(dev, "LANCE INIT failed");
+	SK_print_dev(dev,"Device Structure:");
+#endif
+
+	return -1;                 /* LANCE init failed */
+    }
+
+    PRINTK(("## %s: init done after %d ticks\n", SK_NAME, i));
+
+    /* Clear Initialize done, enable Interrupts, start LANCE */
+
+    SK_write_reg(CSR0, CSR0_IDON | CSR0_INEA | CSR0_STRT);
+
+    PRINTK(("## %s: LANCE started. CSR0: %#06x\n", SK_NAME, 
+            SK_read_reg(CSR0)));
+
+    return 0;                      /* LANCE is up and running */
+
+} /* End of SK_lance_init() */
+
+
+
+/*-
+ * Function       : SK_send_packet
+ * Author         : Patrick J.D. Weichmann
+ * Date Created   : 94/05/27
+ *
+ * Description    : Writes an socket buffer into a transmit descriptor
+ *                  and starts transmission.
+ *
+ * Parameters     : I : struct sk_buff *skb - packet to transfer
+ *                  I : struct net_device *dev  - SK_G16 device structure
+ * Return Value   : 0 - OK
+ *                  1 - Could not transmit (dev_queue_xmit will queue it)
+ *                      and try to sent it later
+ * Globals        : None
+ * Side Effects   : None
+ * Update History :
+ *     YY/MM/DD  uid  Description
+-*/
+
+static void SK_timeout(struct net_device *dev)
+{
+	printk(KERN_WARNING "%s: xmitter timed out, try to restart!\n", dev->name);
+	SK_lance_init(dev, MODE_NORMAL); /* Reinit LANCE */
+	netif_wake_queue(dev);		 /* Clear Transmitter flag */
+	dev->trans_start = jiffies;      /* Mark Start of transmission */
+}
+
+static int SK_send_packet(struct sk_buff *skb, struct net_device *dev)
+{
+    struct priv *p = netdev_priv(dev);
+    struct tmd *tmdp;
+    static char pad[64];
+
+    PRINTK2(("## %s: SK_send_packet() called, CSR0 %#04x.\n", 
+	    SK_NAME, SK_read_reg(CSR0)));
+
+
+    /* 
+     * Block a timer-based transmit from overlapping. 
+     * This means check if we are already in. 
+     */
+
+    netif_stop_queue (dev);
+
+    {
+
+	/* Evaluate Packet length */
+	short len = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN; 
+       
+	tmdp = p->tmdhead + p->tmdnum; /* Which descriptor for transmitting */
+
+	/* Fill in Transmit Message Descriptor */
+
+	/* Copy data into dual ported ram */
+
+	memcpy_toio((tmdp->u.buffer & 0x00ffffff), skb->data, skb->len);
+	if (len != skb->len)
+		memcpy_toio((tmdp->u.buffer & 0x00ffffff) + skb->len, pad, len-skb->len);
+
+	writew(-len, &tmdp->blen);            /* set length to transmit */
+
+	/* 
+	 * Packet start and end is always set because we use the maximum
+	 * packet length as buffer length.
+	 * Relinquish ownership to LANCE
+	 */
+
+	writeb(TX_OWN | TX_STP | TX_ENP, &tmdp->u.s.status);
+	
+	/* Start Demand Transmission */
+	SK_write_reg(CSR0, CSR0_TDMD | CSR0_INEA);
+
+	dev->trans_start = jiffies;   /* Mark start of transmission */
+
+	/* Set pointer to next transmit buffer */
+	p->tmdnum++; 
+	p->tmdnum &= TMDNUM-1; 
+
+	/* Do we own the next transmit buffer ? */
+	if (! (readb(&((p->tmdhead + p->tmdnum)->u.s.status)) & TX_OWN) )
+	{
+	   /* 
+	    * We own next buffer and are ready to transmit, so
+	    * clear busy flag
+	    */
+	   netif_start_queue(dev);
+	}
+
+	p->stats.tx_bytes += skb->len;
+
+    }
+
+    dev_kfree_skb(skb);
+    return 0;  
+} /* End of SK_send_packet */
+
+
+/*-
+ * Function       : SK_interrupt
+ * Author         : Patrick J.D. Weichmann
+ * Date Created   : 94/05/27
+ *
+ * Description    : SK_G16 interrupt handler which checks for LANCE
+ *                  Errors, handles transmit and receive interrupts
+ *
+ * Parameters     : I : int irq, void *dev_id, struct pt_regs * regs -
+ * Return Value   : None
+ * Errors         : None
+ * Globals        : None
+ * Side Effects   : None
+ * Update History :
+ *     YY/MM/DD  uid  Description
+-*/
+
+static irqreturn_t SK_interrupt(int irq, void *dev_id, struct pt_regs * regs)
+{
+    int csr0;
+    struct net_device *dev = dev_id;
+    struct priv *p = netdev_priv(dev);
+
+
+    PRINTK2(("## %s: SK_interrupt(). status: %#06x\n", 
+            SK_NAME, SK_read_reg(CSR0)));
+
+    if (dev == NULL)
+    {
+	printk("SK_interrupt(): IRQ %d for unknown device.\n", irq);
+    }
+    
+    spin_lock (&SK_lock);
+
+    csr0 = SK_read_reg(CSR0);      /* store register for checking */
+
+    /* 
+     * Acknowledge all of the current interrupt sources, disable      
+     * Interrupts (INEA = 0) 
+     */
+
+    SK_write_reg(CSR0, csr0 & CSR0_CLRALL); 
+
+    if (csr0 & CSR0_ERR) /* LANCE Error */
+    {
+	printk("%s: error: %04x\n", dev->name, csr0);
+      
+        if (csr0 & CSR0_MISS)      /* No place to store packet ? */
+        { 
+            p->stats.rx_dropped++;
+        }
+    }
+
+    if (csr0 & CSR0_RINT)          /* Receive Interrupt (packet arrived) */ 
+    {
+	SK_rxintr(dev); 
+    }
+
+    if (csr0 & CSR0_TINT)          /* Transmit interrupt (packet sent) */
+    {
+	SK_txintr(dev);
+    }
+
+    SK_write_reg(CSR0, CSR0_INEA); /* Enable Interrupts */
+
+    spin_unlock (&SK_lock);
+    return IRQ_HANDLED;
+} /* End of SK_interrupt() */ 
+
+
+/*-
+ * Function       : SK_txintr
+ * Author         : Patrick J.D. Weichmann
+ * Date Created   : 94/05/27
+ *
+ * Description    : After sending a packet we check status, update
+ *                  statistics and relinquish ownership of transmit 
+ *                  descriptor ring.
+ *
+ * Parameters     : I : struct net_device *dev - SK_G16 device structure
+ * Return Value   : None
+ * Errors         : None
+ * Globals        : None
+ * Update History :
+ *     YY/MM/DD  uid  Description
+-*/
+
+static void SK_txintr(struct net_device *dev)
+{
+    int tmdstat;
+    struct tmd *tmdp;
+    struct priv *p = netdev_priv(dev);
+
+
+    PRINTK2(("## %s: SK_txintr() status: %#06x\n", 
+            SK_NAME, SK_read_reg(CSR0)));
+
+    tmdp = p->tmdhead + p->tmdlast;     /* Which buffer we sent at last ? */
+
+    /* Set next buffer */
+    p->tmdlast++;
+    p->tmdlast &= TMDNUM-1;
+
+    tmdstat = readb(&tmdp->u.s.status);
+
+    /* 
+     * We check status of transmitted packet.
+     * see LANCE data-sheet for error explanation
+     */
+    if (tmdstat & TX_ERR) /* Error occurred */
+    {
+	int stat2 = readw(&tmdp->status2);
+
+	printk("%s: TX error: %04x %04x\n", dev->name, tmdstat, stat2);
+
+	if (stat2 & TX_TDR)    /* TDR problems? */
+	{
+	    printk("%s: tdr-problems \n", dev->name);
+	}
+
+	if (stat2 & TX_RTRY)   /* Failed in 16 attempts to transmit ? */
+            p->stats.tx_aborted_errors++;   
+        if (stat2 & TX_LCOL)   /* Late collision ? */
+            p->stats.tx_window_errors++; 
+	if (stat2 & TX_LCAR)   /* Loss of Carrier ? */  
+            p->stats.tx_carrier_errors++;
+        if (stat2 & TX_UFLO)   /* Underflow error ? */
+        {
+            p->stats.tx_fifo_errors++;
+
+            /* 
+             * If UFLO error occurs it will turn transmitter of.
+             * So we must reinit LANCE
+             */
+
+            SK_lance_init(dev, MODE_NORMAL);
+        }
+	
+	p->stats.tx_errors++;
+
+	writew(0, &tmdp->status2);             /* Clear error flags */
+    }
+    else if (tmdstat & TX_MORE)        /* Collisions occurred ? */
+    {
+        /* 
+         * Here I have a problem.
+         * I only know that there must be one or up to 15 collisions.
+         * That's why TX_MORE is set, because after 16 attempts TX_RTRY
+         * will be set which means couldn't send packet aborted transfer.
+         *
+         * First I did not have this in but then I thought at minimum
+         * we see that something was not ok.
+         * If anyone knows something better than this to handle this
+         * please report it.
+         */ 
+
+        p->stats.collisions++; 
+    }
+    else   /* Packet sent without any problems */
+    {
+        p->stats.tx_packets++; 
+    }
+
+    /* 
+     * We mark transmitter not busy anymore, because now we have a free
+     * transmit descriptor which can be filled by SK_send_packet and
+     * afterwards sent by the LANCE
+     * 
+     * The function which do handle slow IRQ parts is do_bottom_half()
+     * which runs at normal kernel priority, that means all interrupt are
+     * enabled. (see kernel/irq.c)
+     *  
+     * net_bh does something like this:
+     *  - check if already in net_bh
+     *  - try to transmit something from the send queue
+     *  - if something is in the receive queue send it up to higher 
+     *    levels if it is a known protocol
+     *  - try to transmit something from the send queue
+     */
+
+    netif_wake_queue(dev);
+
+} /* End of SK_txintr() */
+
+
+/*-
+ * Function       : SK_rxintr
+ * Author         : Patrick J.D. Weichmann
+ * Date Created   : 94/05/27
+ *
+ * Description    : Buffer sent, check for errors, relinquish ownership
+ *                  of the receive message descriptor. 
+ *
+ * Parameters     : I : SK_G16 device structure
+ * Return Value   : None
+ * Globals        : None
+ * Update History :
+ *     YY/MM/DD  uid  Description
+-*/
+
+static void SK_rxintr(struct net_device *dev)
+{
+
+    struct rmd *rmdp;
+    int rmdstat;
+    struct priv *p = netdev_priv(dev);
+
+    PRINTK2(("## %s: SK_rxintr(). CSR0: %#06x\n", 
+            SK_NAME, SK_read_reg(CSR0)));
+
+    rmdp = p->rmdhead + p->rmdnum;
+
+    /* As long as we own the next entry, check status and send
+     * it up to higher layer 
+     */
+
+    while (!( (rmdstat = readb(&rmdp->u.s.status)) & RX_OWN))
+    {
+	/* 
+         * Start and end of packet must be set, because we use 
+	 * the ethernet maximum packet length (1518) as buffer size.
+	 * 
+	 * Because our buffers are at maximum OFLO and BUFF errors are
+	 * not to be concerned (see Data sheet)
+	 */
+
+	if ((rmdstat & (RX_STP | RX_ENP)) != (RX_STP | RX_ENP))
+	{
+	    /* Start of a frame > 1518 Bytes ? */
+
+	    if (rmdstat & RX_STP) 
+	    {
+		p->stats.rx_errors++;        /* bad packet received */
+		p->stats.rx_length_errors++; /* packet too long */
+
+		printk("%s: packet too long\n", dev->name);
+	    }
+	    
+	    /* 
+             * All other packets will be ignored until a new frame with
+	     * start (RX_STP) set follows.
+	     * 
+	     * What we do is just give descriptor free for new incoming
+	     * packets. 
+	     */
+
+	    writeb(RX_OWN, &rmdp->u.s.status); /* Relinquish ownership to LANCE */ 
+
+	}
+	else if (rmdstat & RX_ERR)          /* Receive Error ? */
+	{
+	    printk("%s: RX error: %04x\n", dev->name, (int) rmdstat);
+	    
+	    p->stats.rx_errors++;
+
+	    if (rmdstat & RX_FRAM) p->stats.rx_frame_errors++;
+	    if (rmdstat & RX_CRC)  p->stats.rx_crc_errors++;
+
+	    writeb(RX_OWN, &rmdp->u.s.status); /* Relinquish ownership to LANCE */
+
+	}
+	else /* We have a packet which can be queued for the upper layers */
+	{
+
+	    int len = readw(&rmdp->mlen) & 0x0fff;  /* extract message length from receive buffer */
+	    struct sk_buff *skb;
+
+	    skb = dev_alloc_skb(len+2); /* allocate socket buffer */ 
+
+	    if (skb == NULL)                /* Could not get mem ? */
+	    {
+    
+		/* 
+                 * Couldn't allocate sk_buffer so we give descriptor back
+		 * to Lance, update statistics and go ahead.
+		 */
+
+		writeb(RX_OWN, &rmdp->u.s.status); /* Relinquish ownership to LANCE */
+		printk("%s: Couldn't allocate sk_buff, deferring packet.\n",
+		       dev->name);
+		p->stats.rx_dropped++;
+
+		break;                      /* Jump out */
+	    }
+	    
+	    /* Prepare sk_buff to queue for upper layers */
+
+	    skb->dev = dev;
+	    skb_reserve(skb,2);		/* Align IP header on 16 byte boundary */
+	    
+	    /* 
+             * Copy data out of our receive descriptor into sk_buff.
+	     *
+	     * (rmdp->u.buffer & 0x00ffffff) -> get address of buffer and 
+	     * ignore status fields) 
+	     */
+
+	    memcpy_fromio(skb_put(skb,len), (rmdp->u.buffer & 0x00ffffff), len);
+
+
+	    /* 
+             * Notify the upper protocol layers that there is another packet
+	     * to handle
+	     *
+	     * netif_rx() always succeeds. see /net/inet/dev.c for more.
+	     */
+
+	    skb->protocol=eth_type_trans(skb,dev);
+	    netif_rx(skb);                 /* queue packet and mark it for processing */
+	   
+	    /* 
+             * Packet is queued and marked for processing so we
+	     * free our descriptor and update statistics 
+	     */
+
+	    writeb(RX_OWN, &rmdp->u.s.status);
+	    dev->last_rx = jiffies;
+	    p->stats.rx_packets++;
+	    p->stats.rx_bytes += len;
+
+
+	    p->rmdnum++;
+	    p->rmdnum %= RMDNUM;
+
+	    rmdp = p->rmdhead + p->rmdnum;
+	}
+    }
+} /* End of SK_rxintr() */
+
+
+/*-
+ * Function       : SK_close
+ * Author         : Patrick J.D. Weichmann
+ * Date Created   : 94/05/26
+ *
+ * Description    : close gets called from dev_close() and should
+ *                  deinstall the card (free_irq, mem etc).
+ *
+ * Parameters     : I : struct net_device *dev - our device structure
+ * Return Value   : 0 - closed device driver
+ * Errors         : None
+ * Globals        : None
+ * Update History :
+ *     YY/MM/DD  uid  Description
+-*/
+
+/* I have tried to set BOOT_ROM on and RAM off but then, after a 'ifconfig
+ * down' the system stops. So I don't shut set card to init state.
+ */
+
+static int SK_close(struct net_device *dev)
+{
+
+    PRINTK(("## %s: SK_close(). CSR0: %#06x\n", 
+           SK_NAME, SK_read_reg(CSR0)));
+
+    netif_stop_queue(dev);	   /* Transmitter busy */
+
+    printk("%s: Shutting %s down CSR0 %#06x\n", dev->name, SK_NAME, 
+           (int) SK_read_reg(CSR0));
+
+    SK_write_reg(CSR0, CSR0_STOP); /* STOP the LANCE */
+
+    free_irq(dev->irq, dev);      /* Free IRQ */
+
+    return 0; /* always succeed */
+    
+} /* End of SK_close() */
+
+
+/*-
+ * Function       : SK_get_stats
+ * Author         : Patrick J.D. Weichmann
+ * Date Created   : 94/05/26
+ *
+ * Description    : Return current status structure to upper layers.
+ *                  It is called by sprintf_stats (dev.c).
+ *
+ * Parameters     : I : struct net_device *dev   - our device structure
+ * Return Value   : struct net_device_stats * - our current statistics
+ * Errors         : None
+ * Side Effects   : None
+ * Update History :
+ *     YY/MM/DD  uid  Description
+-*/
+
+static struct net_device_stats *SK_get_stats(struct net_device *dev)
+{
+
+    struct priv *p = netdev_priv(dev);
+
+    PRINTK(("## %s: SK_get_stats(). CSR0: %#06x\n", 
+           SK_NAME, SK_read_reg(CSR0)));
+
+    return &p->stats;             /* Return Device status */
+
+} /* End of SK_get_stats() */
+
+
+/*-
+ * Function       : set_multicast_list
+ * Author         : Patrick J.D. Weichmann
+ * Date Created   : 94/05/26
+ *
+ * Description    : This function gets called when a program performs
+ *                  a SIOCSIFFLAGS call. Ifconfig does this if you call
+ *                  'ifconfig [-]allmulti' which enables or disables the
+ *                  Promiscuous mode.
+ *                  Promiscuous mode is when the Network card accepts all
+ *                  packets, not only the packets which match our MAC 
+ *                  Address. It is useful for writing a network monitor,
+ *                  but it is also a security problem. You have to remember
+ *                  that all information on the net is not encrypted.
+ *
+ * Parameters     : I : struct net_device *dev - SK_G16 device Structure
+ * Return Value   : None
+ * Errors         : None
+ * Globals        : None
+ * Update History :
+ *     YY/MM/DD  uid  Description
+ *     95/10/18  ACox  New multicast calling scheme
+-*/
+
+
+/* Set or clear the multicast filter for SK_G16.
+ */
+
+static void set_multicast_list(struct net_device *dev)
+{
+
+    if (dev->flags&IFF_PROMISC)
+    {
+	/* Reinitialize LANCE with MODE_PROM set */
+	SK_lance_init(dev, MODE_PROM);
+    }
+    else if (dev->mc_count==0 && !(dev->flags&IFF_ALLMULTI))
+    {
+	/* Reinitialize LANCE without MODE_PROM */
+	SK_lance_init(dev, MODE_NORMAL);
+    }
+    else
+    {
+	/* Multicast with logical address filter on */
+	/* Reinitialize LANCE without MODE_PROM */
+	SK_lance_init(dev, MODE_NORMAL);
+	
+	/* Not implemented yet. */
+    }
+} /* End of set_multicast_list() */
+
+
+
+/*-
+ * Function       : SK_rom_addr
+ * Author         : Patrick J.D. Weichmann
+ * Date Created   : 94/06/01
+ *
+ * Description    : Try to find a Boot_ROM at all possible locations
+ *
+ * Parameters     : None
+ * Return Value   : Address where Boot_ROM is
+ * Errors         : 0 - Did not find Boot_ROM
+ * Globals        : None
+ * Update History :
+ *     YY/MM/DD  uid  Description
+-*/
+
+unsigned int __init SK_rom_addr(void)
+{
+    int i,j;
+    int rom_found = 0;
+    unsigned int rom_location[] = SK_BOOT_ROM_LOCATIONS;
+    unsigned char rom_id[] = SK_BOOT_ROM_ID;
+    unsigned char test_byte;
+
+    /* Autodetect Boot_ROM */
+    PRINTK(("## %s: Autodetection of Boot_ROM\n", SK_NAME));
+
+    for (i = 0; (rom_location[i] != 0) && (rom_found == 0); i++)
+    {
+	
+	PRINTK(("##   Trying ROM location %#08x", rom_location[i]));
+	
+	rom_found = 1; 
+	for (j = 0; j < 6; j++)
+	{
+	    test_byte = readb(rom_location[i]+j);
+	    PRINTK((" %02x ", *test_byte));
+
+	    if(test_byte != rom_id[j])
+	    {
+		rom_found = 0;
+	    } 
+	}
+	PRINTK(("\n"));
+    }
+
+    if (rom_found == 1)
+    {
+	PRINTK(("## %s: Boot_ROM found at %#08x\n", 
+               SK_NAME, rom_location[(i-1)]));
+
+	return (rom_location[--i]);
+    }
+    else
+    {
+	PRINTK(("%s: No Boot_ROM found\n", SK_NAME));
+	return 0;
+    }
+} /* End of SK_rom_addr() */
+
+
+
+/* LANCE access functions 
+ *
+ * ! CSR1-3 can only be accessed when in CSR0 the STOP bit is set !
+ */
+
+
+/*-
+ * Function       : SK_reset_board
+ *
+ * Author         : Patrick J.D. Weichmann
+ *
+ * Date Created   : 94/05/25
+ *
+ * Description    : This function resets SK_G16 and all components, but
+ *                  POS registers are not changed
+ *
+ * Parameters     : None
+ * Return Value   : None
+ * Errors         : None
+ * Globals        : SK_RAM *board - SK_RAM structure pointer
+ *
+ * Update History :
+ *     YY/MM/DD  uid  Description
+-*/
+
+void SK_reset_board(void)
+{
+    writeb(0x00, SK_PORT);       /* Reset active */
+    mdelay(5);                /* Delay min 5ms */
+    writeb(SK_RESET, SK_PORT);   /* Set back to normal operation */
+
+} /* End of SK_reset_board() */
+
+
+/*-
+ * Function       : SK_set_RAP
+ * Author         : Patrick J.D. Weichmann
+ * Date Created   : 94/05/25
+ *
+ * Description    : Set LANCE Register Address Port to register
+ *                  for later data transfer.
+ *
+ * Parameters     : I : reg_number - which CSR to read/write from/to
+ * Return Value   : None
+ * Errors         : None
+ * Globals        : SK_RAM *board - SK_RAM structure pointer
+ * Update History :
+ *     YY/MM/DD  uid  Description
+-*/
+
+void SK_set_RAP(int reg_number)
+{
+    writew(reg_number, SK_IOREG);
+    writeb(SK_RESET | SK_RAP | SK_WREG, SK_PORT);
+    writeb(SK_DOIO, SK_IOCOM);
+
+    while (readb(SK_PORT) & SK_IORUN) 
+	barrier();
+} /* End of SK_set_RAP() */
+
+
+/*-
+ * Function       : SK_read_reg
+ * Author         : Patrick J.D. Weichmann
+ * Date Created   : 94/05/25
+ *
+ * Description    : Set RAP and read data from a LANCE CSR register
+ *
+ * Parameters     : I : reg_number - which CSR to read from
+ * Return Value   : Register contents
+ * Errors         : None
+ * Globals        : SK_RAM *board - SK_RAM structure pointer
+ * Update History :
+ *     YY/MM/DD  uid  Description
+-*/
+
+int SK_read_reg(int reg_number)
+{
+    SK_set_RAP(reg_number);
+
+    writeb(SK_RESET | SK_RDATA | SK_RREG, SK_PORT);
+    writeb(SK_DOIO, SK_IOCOM);
+
+    while (readb(SK_PORT) & SK_IORUN)
+	barrier();
+    return (readw(SK_IOREG));
+
+} /* End of SK_read_reg() */
+
+
+/*-
+ * Function       : SK_rread_reg
+ * Author         : Patrick J.D. Weichmann
+ * Date Created   : 94/05/28
+ *
+ * Description    : Read data from preseted register.
+ *                  This function requires that you know which
+ *                  Register is actually set. Be aware that CSR1-3
+ *                  can only be accessed when in CSR0 STOP is set.
+ *
+ * Return Value   : Register contents
+ * Errors         : None
+ * Globals        : SK_RAM *board - SK_RAM structure pointer
+ * Update History :
+ *     YY/MM/DD  uid  Description
+-*/
+
+int SK_rread_reg(void)
+{
+    writeb(SK_RESET | SK_RDATA | SK_RREG, SK_PORT);
+
+    writeb(SK_DOIO, SK_IOCOM);
+
+    while (readb(SK_PORT) & SK_IORUN)
+	barrier();
+    return (readw(SK_IOREG));
+
+} /* End of SK_rread_reg() */
+
+
+/*-
+ * Function       : SK_write_reg
+ * Author         : Patrick J.D. Weichmann
+ * Date Created   : 94/05/25
+ *
+ * Description    : This function sets the RAP then fills in the
+ *                  LANCE I/O Reg and starts Transfer to LANCE.
+ *                  It waits until transfer has ended which is max. 7 ms
+ *                  and then it returns.
+ *
+ * Parameters     : I : reg_number - which CSR to write to
+ *                  I : value      - what value to fill into register 
+ * Return Value   : None
+ * Errors         : None
+ * Globals        : SK_RAM *board - SK_RAM structure pointer
+ * Update History :
+ *     YY/MM/DD  uid  Description
+-*/
+
+void SK_write_reg(int reg_number, int value)
+{
+    SK_set_RAP(reg_number);
+
+    writew(value, SK_IOREG);
+    writeb(SK_RESET | SK_RDATA | SK_WREG, SK_PORT);
+    writeb(SK_DOIO, SK_IOCOM);
+
+    while (readb(SK_PORT) & SK_IORUN)
+	barrier();
+} /* End of SK_write_reg */
+
+
+
+/* 
+ * Debugging functions
+ * -------------------
+ */
+
+/*-
+ * Function       : SK_print_pos
+ * Author         : Patrick J.D. Weichmann
+ * Date Created   : 94/05/25
+ *
+ * Description    : This function prints out the 4 POS (Programmable
+ *                  Option Select) Registers. Used mainly to debug operation.
+ *
+ * Parameters     : I : struct net_device *dev - SK_G16 device structure
+ *                  I : char * - Text which will be printed as title
+ * Return Value   : None
+ * Errors         : None
+ * Update History :
+ *     YY/MM/DD  uid  Description
+-*/
+
+void SK_print_pos(struct net_device *dev, char *text)
+{
+    int ioaddr = dev->base_addr;
+
+    unsigned char pos0 = inb(SK_POS0),
+		  pos1 = inb(SK_POS1),
+		  pos2 = inb(SK_POS2),
+		  pos3 = inb(SK_POS3),
+		  pos4 = inb(SK_POS4);
+
+
+    printk("## %s: %s.\n"
+           "##   pos0=%#4x pos1=%#4x pos2=%#04x pos3=%#08x pos4=%#04x\n",
+           SK_NAME, text, pos0, pos1, pos2, (pos3<<14), pos4);
+
+} /* End of SK_print_pos() */
+
+
+
+/*-
+ * Function       : SK_print_dev
+ * Author         : Patrick J.D. Weichmann
+ * Date Created   : 94/05/25
+ *
+ * Description    : This function simply prints out the important fields
+ *                  of the device structure.
+ *
+ * Parameters     : I : struct net_device *dev  - SK_G16 device structure
+ *                  I : char *text - Title for printing
+ * Return Value   : None
+ * Errors         : None
+ * Update History :
+ *     YY/MM/DD  uid  Description
+-*/
+
+void SK_print_dev(struct net_device *dev, char *text)
+{
+    if (dev == NULL)
+    {
+	printk("## %s: Device Structure. %s\n", SK_NAME, text);
+	printk("## DEVICE == NULL\n");
+    }
+    else
+    {
+	printk("## %s: Device Structure. %s\n", SK_NAME, text);
+	printk("## Device Name: %s Base Address: %#06lx IRQ: %d\n", 
+               dev->name, dev->base_addr, dev->irq);
+	       
+	printk("## next device: %#08x init function: %#08x\n", 
+              (int) dev->next, (int) dev->init);
+    }
+
+} /* End of SK_print_dev() */
+
+
+
+/*-
+ * Function       : SK_print_ram
+ * Author         : Patrick J.D. Weichmann
+ * Date Created   : 94/06/02
+ *
+ * Description    : This function is used to check how are things set up
+ *                  in the 16KB RAM. Also the pointers to the receive and 
+ *                  transmit descriptor rings and rx and tx buffers locations.
+ *                  It contains a minor bug in printing, but has no effect to the values
+ *                  only newlines are not correct.
+ *
+ * Parameters     : I : struct net_device *dev - SK_G16 device structure
+ * Return Value   : None
+ * Errors         : None
+ * Globals        : None
+ * Update History :
+ *     YY/MM/DD  uid  Description
+-*/
+
+void __init SK_print_ram(struct net_device *dev)
+{
+
+    int i;    
+    struct priv *p = netdev_priv(dev);
+
+    printk("## %s: RAM Details.\n"
+           "##   RAM at %#08x tmdhead: %#08x rmdhead: %#08x initblock: %#08x\n",
+           SK_NAME, 
+           (unsigned int) p->ram,
+           (unsigned int) p->tmdhead, 
+           (unsigned int) p->rmdhead, 
+           (unsigned int) &(p->ram)->ib);
+           
+    printk("##   ");
+
+    for(i = 0; i < TMDNUM; i++)
+    {
+           if (!(i % 3)) /* Every third line do a newline */
+           {
+               printk("\n##   ");
+           }
+        printk("tmdbufs%d: %#08x ", (i+1), (int) p->tmdbufs[i]);
+    }
+    printk("##   ");
+
+    for(i = 0; i < RMDNUM; i++)
+    {
+         if (!(i % 3)) /* Every third line do a newline */
+           {
+               printk("\n##   ");
+           }
+        printk("rmdbufs%d: %#08x ", (i+1), (int) p->rmdbufs[i]);
+    } 
+    printk("\n");
+
+} /* End of SK_print_ram() */
+