Import of Linux/MIPS 2.1.14

1 files changed, 1194 insertions, 0 deletions

diff --git a/drivers/net/atarilance.c b/drivers/net/atarilance.c
new file mode 100644
index 000000000..2e843537f
--- /dev/null
+++ b/drivers/net/atarilance.c
@@ -0,0 +1,1194 @@
+/* atarilance.c: Ethernet driver for VME Lance cards on the Atari */
+/*
+	Written 1995/96 by Roman Hodek (Roman.Hodek@informatik.uni-erlangen.de)
+
+	This software may be used and distributed according to the terms
+	of the GNU Public License, incorporated herein by reference.
+
+	This drivers was written with the following sources of reference:
+	 - The driver for the Riebl Lance card by the TU Vienna.
+	 - The modified TUW driver for PAM's VME cards
+	 - The PC-Linux driver for Lance cards (but this is for bus master
+       cards, not the shared memory ones)
+	 - The Amiga Ariadne driver
+
+	v1.0: (in 1.2.13pl4/0.9.13)
+	      Initial version
+	v1.1: (in 1.2.13pl5)
+	      more comments
+		  deleted some debugging stuff
+		  optimized register access (keep AREG pointing to CSR0)
+		  following AMD, CSR0_STRT should be set only after IDON is detected
+		  use memcpy() for data transfers, that also employs long word moves
+		  better probe procedure for 24-bit systems
+          non-VME-RieblCards need extra delays in memcpy
+		  must also do write test, since 0xfxe00000 may hit ROM
+		  use 8/32 tx/rx buffers, which should give better NFS performance;
+		    this is made possible by shifting the last packet buffer after the
+		    RieblCard reserved area
+    v1.2: (in 1.2.13pl8)
+	      again fixed probing for the Falcon; 0xfe01000 hits phys. 0x00010000
+		  and thus RAM, in case of no Lance found all memory contents have to
+		  be restored!
+		  Now possible to compile as module.
+	v1.3: 03/30/96 Jes Sorensen, Roman (in 1.3)
+	      Several little 1.3 adaptions
+		  When the lance is stopped it jumps back into little-endian
+		  mode. It is therefore necessary to put it back where it
+		  belongs, in big endian mode, in order to make things work.
+		  This might be the reason why multicast-mode didn't work
+		  before, but I'm not able to test it as I only got an Amiga
+		  (we had similar problems with the A2065 driver).
+
+*/
+
+static char *version = "atarilance.c: v1.3 04/04/96 "
+					   "Roman.Hodek@informatik.uni-erlangen.de\n";
+
+#include <linux/module.h>
+
+#include <linux/stddef.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/ptrace.h>
+#include <linux/errno.h>
+#include <linux/malloc.h>
+#include <linux/interrupt.h>
+
+#include <asm/irq.h>
+#include <asm/atarihw.h>
+#include <asm/atariints.h>
+#include <asm/bitops.h>
+#include <asm/io.h>
+#include <asm/bootinfo.h>
+
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+
+/* Debug level:
+ *  0 = silent, print only serious errors
+ *  1 = normal, print error messages
+ *  2 = debug, print debug infos
+ *  3 = debug, print even more debug infos (packet data)
+ */
+
+#define	LANCE_DEBUG	1
+
+#ifdef LANCE_DEBUG
+static int lance_debug = LANCE_DEBUG;
+#else
+static int lance_debug = 1;
+#endif
+
+/* Print debug messages on probing? */
+#undef LANCE_DEBUG_PROBE
+
+#define	DPRINTK(n,a)							\
+	do {										\
+		if (lance_debug >= n)					\
+			printk a;							\
+	} while( 0 )
+
+#ifdef LANCE_DEBUG_PROBE
+# define PROBE_PRINT(a)	printk a
+#else
+# define PROBE_PRINT(a)	
+#endif
+
+/* These define the number of Rx and Tx buffers as log2. (Only powers
+ * of two are valid)
+ * Much more rx buffers (32) are reserved than tx buffers (8), since receiving
+ * is more time critical then sending and packets may have to remain in the
+ * board's memory when main memory is low.
+ */
+
+#define TX_LOG_RING_SIZE			3
+#define RX_LOG_RING_SIZE			5
+
+/* These are the derived values */
+
+#define TX_RING_SIZE			(1 << TX_LOG_RING_SIZE)
+#define TX_RING_LEN_BITS		(TX_LOG_RING_SIZE << 5)
+#define	TX_RING_MOD_MASK		(TX_RING_SIZE - 1)
+
+#define RX_RING_SIZE			(1 << RX_LOG_RING_SIZE)
+#define RX_RING_LEN_BITS		(RX_LOG_RING_SIZE << 5)
+#define	RX_RING_MOD_MASK		(RX_RING_SIZE - 1)
+
+/* The LANCE Rx and Tx ring descriptors. */
+struct lance_rx_head {
+	unsigned short			base;		/* Low word of base addr */
+	volatile unsigned char	flag;
+	unsigned char			base_hi;	/* High word of base addr (unused) */
+	short					buf_length;	/* This length is 2s complement! */
+	volatile short			msg_length;	/* This length is "normal". */
+};
+
+struct lance_tx_head {
+	unsigned short			base;		/* Low word of base addr */
+	volatile unsigned char	flag;
+	unsigned char			base_hi;	/* High word of base addr (unused) */
+	short					length;		/* Length is 2s complement! */
+	volatile short			misc;
+};
+
+struct ringdesc {
+	unsigned short	adr_lo;		/* Low 16 bits of address */
+	unsigned char	len;		/* Length bits */
+	unsigned char	adr_hi;		/* High 8 bits of address (unused) */
+};
+
+/* The LANCE initialization block, described in databook. */
+struct lance_init_block {
+	unsigned short	mode;		/* Pre-set mode */
+	unsigned char	hwaddr[6];	/* Physical ethernet address */
+	unsigned		filter[2];	/* Multicast filter (unused). */
+	/* Receive and transmit ring base, along with length bits. */
+	struct ringdesc	rx_ring;
+	struct ringdesc	tx_ring;
+};
+
+/* The whole layout of the Lance shared memory */
+struct lance_memory {
+	struct lance_init_block	init;
+	struct lance_tx_head	tx_head[TX_RING_SIZE];
+	struct lance_rx_head	rx_head[RX_RING_SIZE];
+	char					packet_area[0];	/* packet data follow after the
+											 * init block and the ring
+											 * descriptors and are located
+											 * at runtime */
+};
+
+/* RieblCard specifics:
+ * The original TOS driver for these cards reserves the area from offset
+ * 0xee70 to 0xeebb for storing configuration data. Of interest to us is the
+ * Ethernet address there, and the magic for verifying the data's validity.
+ * The reserved area isn't touch by packet buffers. Furthermore, offset 0xfffe
+ * is reserved for the interrupt vector number.
+ */
+#define	RIEBL_RSVD_START	0xee70
+#define	RIEBL_RSVD_END		0xeec0
+#define RIEBL_MAGIC			0x09051990
+#define RIEBL_MAGIC_ADDR	((unsigned long *)(((char *)MEM) + 0xee8a))
+#define RIEBL_HWADDR_ADDR	((unsigned char *)(((char *)MEM) + 0xee8e))
+#define RIEBL_IVEC_ADDR		((unsigned short *)(((char *)MEM) + 0xfffe))
+
+/* This is a default address for the old RieblCards without a battery
+ * that have no ethernet address at boot time. 00:00:36:04 is the
+ * prefix for Riebl cards, the 00:00 at the end is arbitrary.
+ */
+
+static unsigned char OldRieblDefHwaddr[6] = {
+	0x00, 0x00, 0x36, 0x04, 0x00, 0x00
+};
+
+
+/* I/O registers of the Lance chip */
+
+struct lance_ioreg {
+/* base+0x0 */	volatile unsigned short	data;
+/* base+0x2 */	volatile unsigned short	addr;
+				unsigned char			_dummy1[3];
+/* base+0x7 */	volatile unsigned char	ivec;
+				unsigned char			_dummy2[5];
+/* base+0xd */	volatile unsigned char	eeprom;
+				unsigned char			_dummy3;
+/* base+0xf */	volatile unsigned char	mem;
+};
+
+/* Types of boards this driver supports */
+
+enum lance_type {
+	OLD_RIEBL,		/* old Riebl card without battery */
+	NEW_RIEBL,		/* new Riebl card with battery */
+	PAM_CARD		/* PAM card with EEPROM */
+};
+
+static char *lance_names[] = {
+	"Riebl-Card (without battery)",
+	"Riebl-Card (with battery)",
+	"PAM intern card"
+};
+
+/* The driver's private device structure */
+
+struct lance_private {
+	enum lance_type		cardtype;
+	struct lance_ioreg	*iobase;
+	struct lance_memory	*mem;
+	int					cur_rx, cur_tx;	/* The next free ring entry */
+	int					dirty_tx;		/* Ring entries to be freed. */
+						/* copy function */
+	void				*(*memcpy_f)( void *, const void *, size_t );
+	struct enet_statistics stats;
+/* These two must be ints for set_bit() */
+	int					tx_full;
+	int					lock;
+};
+
+/* I/O register access macros */
+
+#define	MEM		lp->mem
+#define	DREG	IO->data
+#define	AREG	IO->addr
+#define	REGA(a)	( AREG = (a), DREG )
+
+/* Definitions for packet buffer access: */
+#define PKT_BUF_SZ		1544
+/* Get the address of a packet buffer corresponding to a given buffer head */
+#define	PKTBUF_ADDR(head)	(((unsigned char *)(MEM)) + (head)->base)
+
+/* Possible memory/IO addresses for probing */
+
+struct lance_addr {
+	unsigned long	memaddr;
+	unsigned long	ioaddr;
+	int				slow_flag;
+} lance_addr_list[] = {
+	{ 0xfe010000, 0xfe00fff0, 0 },	/* RieblCard VME in TT */
+	{ 0xffc10000, 0xffc0fff0, 0 },	/* RieblCard VME in MegaSTE
+									   (highest byte stripped) */
+	{ 0xffe00000, 0xffff7000, 1 },	/* RieblCard in ST
+									   (highest byte stripped) */
+	{ 0xffd00000, 0xffff7000, 1 },	/* RieblCard in ST with hw modif. to
+									   avoid conflict with ROM
+									   (highest byte stripped) */
+	{ 0xffcf0000, 0xffcffff0, 0 },	/* PAMCard VME in TT and MSTE
+									   (highest byte stripped) */
+};
+
+#define	N_LANCE_ADDR	(sizeof(lance_addr_list)/sizeof(*lance_addr_list))
+
+
+/* Definitions for the Lance */
+
+/* tx_head flags */
+#define TMD1_ENP		0x01	/* end of packet */
+#define TMD1_STP		0x02	/* start of packet */
+#define TMD1_DEF		0x04	/* deferred */
+#define TMD1_ONE		0x08	/* one retry needed */
+#define TMD1_MORE		0x10	/* more than one retry needed */
+#define TMD1_ERR		0x40	/* error summary */
+#define TMD1_OWN 		0x80	/* ownership (set: chip owns) */
+
+#define TMD1_OWN_CHIP	TMD1_OWN
+#define TMD1_OWN_HOST	0
+
+/* tx_head misc field */
+#define TMD3_TDR		0x03FF	/* Time Domain Reflectometry counter */
+#define TMD3_RTRY		0x0400	/* failed after 16 retries */
+#define TMD3_LCAR		0x0800	/* carrier lost */
+#define TMD3_LCOL		0x1000	/* late collision */
+#define TMD3_UFLO		0x4000	/* underflow (late memory) */
+#define TMD3_BUFF		0x8000	/* buffering error (no ENP) */
+
+/* rx_head flags */
+#define RMD1_ENP		0x01	/* end of packet */
+#define RMD1_STP		0x02	/* start of packet */
+#define RMD1_BUFF		0x04	/* buffer error */
+#define RMD1_CRC		0x08	/* CRC error */
+#define RMD1_OFLO		0x10	/* overflow */
+#define RMD1_FRAM		0x20	/* framing error */
+#define RMD1_ERR		0x40	/* error summary */
+#define RMD1_OWN 		0x80	/* ownership (set: ship owns) */
+
+#define RMD1_OWN_CHIP	RMD1_OWN
+#define RMD1_OWN_HOST	0
+
+/* register names */
+#define CSR0	0		/* mode/status */
+#define CSR1	1		/* init block addr (low) */
+#define CSR2	2		/* init block addr (high) */
+#define CSR3	3		/* misc */
+#define CSR8	8	  	/* address filter */
+#define CSR15	15		/* promiscuous mode */
+
+/* CSR0 */
+/* (R=readable, W=writeable, S=set on write, C=clear on write) */
+#define CSR0_INIT	0x0001		/* initialize (RS) */
+#define CSR0_STRT	0x0002		/* start (RS) */
+#define CSR0_STOP	0x0004		/* stop (RS) */
+#define CSR0_TDMD	0x0008		/* transmit demand (RS) */
+#define CSR0_TXON	0x0010		/* transmitter on (R) */
+#define CSR0_RXON	0x0020		/* receiver on (R) */
+#define CSR0_INEA	0x0040		/* interrupt enable (RW) */
+#define CSR0_INTR	0x0080		/* interrupt active (R) */
+#define CSR0_IDON	0x0100		/* initialization done (RC) */
+#define CSR0_TINT	0x0200		/* transmitter interrupt (RC) */
+#define CSR0_RINT	0x0400		/* receiver interrupt (RC) */
+#define CSR0_MERR	0x0800		/* memory error (RC) */
+#define CSR0_MISS	0x1000		/* missed frame (RC) */
+#define CSR0_CERR	0x2000		/* carrier error (no heartbeat :-) (RC) */
+#define CSR0_BABL	0x4000		/* babble: tx-ed too many bits (RC) */
+#define CSR0_ERR	0x8000		/* error (RC) */
+
+/* CSR3 */
+#define CSR3_BCON	0x0001		/* byte control */
+#define CSR3_ACON	0x0002		/* ALE control */
+#define CSR3_BSWP	0x0004		/* byte swap (1=big endian) */
+
+
+
+/***************************** Prototypes *****************************/
+
+static int addr_accessible( volatile void *regp, int wordflag, int
+                            writeflag );
+static unsigned long lance_probe1( struct device *dev, struct lance_addr
+                                   *init_rec );
+static int lance_open( struct device *dev );
+static void lance_init_ring( struct device *dev );
+static int lance_start_xmit( struct sk_buff *skb, struct device *dev );
+static void lance_interrupt( int irq, struct pt_regs *fp, struct device
+                             *dev );
+static int lance_rx( struct device *dev );
+static int lance_close( struct device *dev );
+static struct enet_statistics *lance_get_stats( struct device *dev );
+static void set_multicast_list( struct device *dev );
+static int lance_set_mac_address( struct device *dev, void *addr );
+
+/************************* End of Prototypes **************************/
+
+
+
+
+
+void *slow_memcpy( void *dst, const void *src, size_t len )
+
+{	char *cto = dst;
+	const char *cfrom = src;
+
+	while( len-- ) {
+		*cto++ = *cfrom++;
+		MFPDELAY();
+	}
+	return( dst );
+}
+
+
+int atarilance_probe( struct device *dev )
+
+{	int i;
+	static int found = 0;
+	
+	if (!MACH_IS_ATARI || found)
+		/* Assume there's only one board possible... That seems true, since
+		 * the Riebl/PAM board's address cannot be changed. */
+		return( ENODEV );
+	
+	for( i = 0; i < N_LANCE_ADDR; ++i ) {
+		if (lance_probe1( dev, &lance_addr_list[i] )) {
+			found = 1;
+			return( 0 );
+		}
+	}
+
+	return( ENODEV );
+}
+
+
+/* Derived from hwreg_present() in atari/config.c: */
+
+static int addr_accessible( volatile void *regp, int wordflag, int writeflag )
+
+{	int		ret;
+	long	flags;
+	long	*vbr, save_berr;
+
+	save_flags(flags);
+	cli();
+
+	__asm__ __volatile__ ( "movec	%/vbr,%0" : "=r" (vbr) : );
+	save_berr = vbr[2];
+	
+	__asm__ __volatile__
+	(	"movel	%/sp,%/d1\n\t"
+		"movel	#Lberr,%2@\n\t"
+		"moveq	#0,%0\n\t"
+		"tstl   %3\n\t"
+		"bne	1f\n\t"
+		"moveb	%1@,%/d0\n\t"
+		"nop	\n\t"
+		"bra	2f\n"
+"1:		 movew	%1@,%/d0\n\t"
+		"nop	\n"
+"2:		 tstl   %4\n\t"
+		"beq	2f\n\t"
+		"tstl	%3\n\t"
+		"bne	1f\n\t"
+		"clrb	%1@\n\t"
+		"nop	\n\t"
+		"moveb	%/d0,%1@\n\t"
+		"nop	\n\t"
+		"bra	2f\n"
+"1:		 clrw	%1@\n\t"
+		"nop	\n\t"
+		"movew	%/d0,%1@\n\t"
+		"nop	\n"
+"2:		 moveq	#1,%0\n"
+"Lberr:	 movel	%/d1,%/sp"
+		: "=&d" (ret)
+		: "a" (regp), "a" (&vbr[2]), "rm" (wordflag), "rm" (writeflag)
+		: "d0", "d1", "memory"
+	);
+
+	vbr[2] = save_berr;
+	restore_flags(flags);
+	
+	return( ret );
+}
+
+
+static unsigned long lance_probe1( struct device *dev,
+								   struct lance_addr *init_rec )
+
+{	volatile unsigned short *memaddr =
+		(volatile unsigned short *)init_rec->memaddr;
+	volatile unsigned short *ioaddr =
+		(volatile unsigned short *)init_rec->ioaddr;
+	struct lance_private	*lp;
+	struct lance_ioreg		*IO;
+	int 					i;
+	static int 				did_version = 0;
+	unsigned short			save1, save2;
+	
+	PROBE_PRINT(( "Probing for Lance card at mem %#lx io %#lx\n",
+				  (long)memaddr, (long)ioaddr ));
+
+	/* Test whether memory readable and writable */
+	PROBE_PRINT(( "lance_probe1: testing memory to be accessible\n" ));
+	if (!addr_accessible( memaddr, 1, 1 )) goto probe_fail;
+
+	/* Written values should come back... */
+	PROBE_PRINT(( "lance_probe1: testing memory to be writable (1)\n" ));
+	save1 = *memaddr;
+	*memaddr = 0x0001;
+	if (*memaddr != 0x0001) goto probe_fail;
+	PROBE_PRINT(( "lance_probe1: testing memory to be writable (2)\n" ));
+	*memaddr = 0x0000;
+	if (*memaddr != 0x0000) goto probe_fail;
+	*memaddr = save1;
+	
+	/* First port should be readable and writable */
+	PROBE_PRINT(( "lance_probe1: testing ioport to be accessible\n" ));
+	if (!addr_accessible( ioaddr, 1, 1 )) goto probe_fail;
+
+	/* and written values should be readable */
+	PROBE_PRINT(( "lance_probe1: testing ioport to be writeable\n" ));
+	save2 = ioaddr[1];
+	ioaddr[1] = 0x0001;
+	if (ioaddr[1] != 0x0001) goto probe_fail;
+
+	/* The CSR0_INIT bit should not be readable */
+	PROBE_PRINT(( "lance_probe1: testing CSR0 register function (1)\n" ));
+	save1 = ioaddr[0];
+	ioaddr[1] = CSR0;
+	ioaddr[0] = CSR0_INIT | CSR0_STOP;
+	if (ioaddr[0] != CSR0_STOP) {
+		ioaddr[0] = save1;
+		ioaddr[1] = save2;
+		goto probe_fail;
+	}
+	PROBE_PRINT(( "lance_probe1: testing CSR0 register function (2)\n" ));
+	ioaddr[0] = CSR0_STOP;
+	if (ioaddr[0] != CSR0_STOP) {
+		ioaddr[0] = save1;
+		ioaddr[1] = save2;
+		goto probe_fail;
+	}
+
+	/* Now ok... */
+	PROBE_PRINT(( "lance_probe1: Lance card detected\n" ));
+	goto probe_ok;
+
+  probe_fail:
+	return( 0 );
+	
+  probe_ok:
+	init_etherdev( dev, sizeof(struct lance_private) );
+	if (!dev->priv)
+		dev->priv = kmalloc( sizeof(struct lance_private), GFP_KERNEL );
+	lp = (struct lance_private *)dev->priv;
+	MEM = (struct lance_memory *)memaddr;
+	IO = lp->iobase = (struct lance_ioreg *)ioaddr;
+	dev->base_addr = (unsigned long)ioaddr; /* informational only */
+	lp->memcpy_f = init_rec->slow_flag ? slow_memcpy : memcpy;
+	
+	REGA( CSR0 ) = CSR0_STOP;
+
+	/* Now test for type: If the eeprom I/O port is readable, it is a
+	 * PAM card */
+	if (addr_accessible( &(IO->eeprom), 0, 0 )) {
+		/* Switch back to Ram */
+		i = IO->mem;
+		lp->cardtype = PAM_CARD;
+	}
+	else if (*RIEBL_MAGIC_ADDR == RIEBL_MAGIC) {
+		lp->cardtype = NEW_RIEBL;
+	}
+	else
+		lp->cardtype = OLD_RIEBL;
+		
+	if (lp->cardtype == PAM_CARD ||
+		memaddr == (unsigned short *)0xffe00000) {
+		/* PAMs card and Riebl on ST use level 5 autovector */
+		add_isr( IRQ_AUTO_5, (isrfunc)lance_interrupt, IRQ_TYPE_PRIO, dev,
+				 "PAM/Riebl-ST Ethernet" );
+		dev->irq = (unsigned short)IRQ_AUTO_5;
+	}
+	else {
+		/* For VME-RieblCards, request a free VME int;
+		 * (This must be unsigned long, since dev->irq is short and the
+		 * IRQ_MACHSPEC bit would be cut off...)
+		 */
+		unsigned long irq = atari_register_vme_int();
+		if (!irq) {
+			printk( "Lance: request for VME interrupt failed\n" );
+			return( 0 );
+		}
+		add_isr( irq, (isrfunc)lance_interrupt, IRQ_TYPE_PRIO, dev,
+				 "Riebl-VME Ethernet" );
+		dev->irq = irq;
+	}
+
+	printk("%s: %s at io %#lx, mem %#lx, irq %d%s, hwaddr ",
+		   dev->name, lance_names[lp->cardtype],
+		   (unsigned long)ioaddr,
+		   (unsigned long)memaddr,
+		   dev->irq,
+		   init_rec->slow_flag ? " (slow memcpy)" : "" );
+
+	/* Get the ethernet address */
+	switch( lp->cardtype ) {
+	  case OLD_RIEBL:
+		/* No ethernet address! (Set some default address) */
+		memcpy( dev->dev_addr, OldRieblDefHwaddr, 6 );
+		break;
+	  case NEW_RIEBL:
+		lp->memcpy_f( dev->dev_addr, RIEBL_HWADDR_ADDR, 6 );
+		break;
+	  case PAM_CARD:
+		i = IO->eeprom;
+		for( i = 0; i < 6; ++i )
+			dev->dev_addr[i] = 
+				((((unsigned short *)MEM)[i*2] & 0x0f) << 4) |
+				((((unsigned short *)MEM)[i*2+1] & 0x0f));
+		i = IO->mem;
+		break;
+	}
+	for( i = 0; i < 6; ++i )
+		printk( "%02x%s", dev->dev_addr[i], (i < 5) ? ":" : "\n" );
+	if (lp->cardtype == OLD_RIEBL) {
+		printk( "%s: Warning: This is a default ethernet address!\n",
+				dev->name );
+		printk( "      Use \"ifconfig hw ether ...\" to set the address.\n" );
+	}
+	
+	MEM->init.mode = 0x0000;		/* Disable Rx and Tx. */
+	for( i = 0; i < 6; i++ )
+		MEM->init.hwaddr[i] = dev->dev_addr[i^1]; /* <- 16 bit swap! */
+	MEM->init.filter[0] = 0x00000000;
+	MEM->init.filter[1] = 0x00000000;
+	MEM->init.rx_ring.adr_lo = offsetof( struct lance_memory, rx_head );
+	MEM->init.rx_ring.adr_hi = 0;
+	MEM->init.rx_ring.len    = RX_RING_LEN_BITS;
+	MEM->init.tx_ring.adr_lo = offsetof( struct lance_memory, tx_head );
+	MEM->init.tx_ring.adr_hi = 0;
+	MEM->init.tx_ring.len    = TX_RING_LEN_BITS;
+
+	if (lp->cardtype == PAM_CARD)
+		IO->ivec = IRQ_SOURCE_TO_VECTOR(dev->irq);
+	else
+		*RIEBL_IVEC_ADDR = IRQ_SOURCE_TO_VECTOR(dev->irq);
+	
+	if (did_version++ == 0)
+		DPRINTK( 1, ( version ));
+
+	/* The LANCE-specific entries in the device structure. */
+	dev->open = &lance_open;
+	dev->hard_start_xmit = &lance_start_xmit;
+	dev->stop = &lance_close;
+	dev->get_stats = &lance_get_stats;
+	dev->set_multicast_list = &set_multicast_list;
+	dev->set_mac_address = &lance_set_mac_address;
+	dev->start = 0;
+
+	memset( &lp->stats, 0, sizeof(lp->stats) );
+	
+	return( 1 );
+}
+
+
+static int lance_open( struct device *dev )
+
+{	struct lance_private *lp = (struct lance_private *)dev->priv;
+	struct lance_ioreg	 *IO = lp->iobase;
+	int i;
+
+	DPRINTK( 2, ( "%s: lance_open()\n", dev->name ));
+
+	lance_init_ring(dev);
+	/* Re-initialize the LANCE, and start it when done. */
+
+	REGA( CSR3 ) = CSR3_BSWP | (lp->cardtype == PAM_CARD ? CSR3_ACON : 0); 
+	REGA( CSR2 ) = 0;
+	REGA( CSR1 ) = 0;
+	REGA( CSR0 ) = CSR0_INIT;
+	/* From now on, AREG is kept to point to CSR0 */
+	
+	i = 1000000;
+	while (--i > 0)
+		if (DREG & CSR0_IDON)
+			break;
+	if (i < 0 || (DREG & CSR0_ERR)) {
+		DPRINTK( 2, ( "lance_open(): opening %s failed, i=%d, csr0=%04x\n",
+					  dev->name, i, DREG ));
+		DREG = CSR0_STOP;
+		return( -EIO );
+	}
+	DREG = CSR0_IDON;
+	DREG = CSR0_STRT;
+	DREG = CSR0_INEA;
+
+	dev->tbusy = 0;
+	dev->interrupt = 0;
+	dev->start = 1;
+
+	DPRINTK( 2, ( "%s: LANCE is open, csr0 %04x\n", dev->name, DREG ));
+	MOD_INC_USE_COUNT;
+
+	return( 0 );
+}
+
+
+/* Initialize the LANCE Rx and Tx rings. */
+
+static void lance_init_ring( struct device *dev )
+
+{	struct lance_private *lp = (struct lance_private *)dev->priv;
+	int i;
+	unsigned offset;
+	
+	lp->lock = 0;
+	lp->tx_full = 0;
+	lp->cur_rx = lp->cur_tx = 0;
+	lp->dirty_tx = 0;
+
+	offset = offsetof( struct lance_memory, packet_area );
+
+/* If the packet buffer at offset 'o' would conflict with the reserved area
+ * of RieblCards, advance it */
+#define	CHECK_OFFSET(o)														 \
+	do {																	 \
+		if (lp->cardtype == OLD_RIEBL || lp->cardtype == NEW_RIEBL) {		 \
+			if (((o) < RIEBL_RSVD_START) ? (o)+PKT_BUF_SZ > RIEBL_RSVD_START \
+										 : (o) < RIEBL_RSVD_END)			 \
+				(o) = RIEBL_RSVD_END;										 \
+		}																	 \
+	} while(0)
+
+	for( i = 0; i < TX_RING_SIZE; i++ ) {
+		CHECK_OFFSET(offset);
+		MEM->tx_head[i].base = offset;
+		MEM->tx_head[i].flag = TMD1_OWN_HOST;
+ 		MEM->tx_head[i].base_hi = 0;
+		MEM->tx_head[i].length = 0;
+		MEM->tx_head[i].misc = 0;
+		offset += PKT_BUF_SZ;
+	}
+
+	for( i = 0; i < RX_RING_SIZE; i++ ) {
+		CHECK_OFFSET(offset);
+		MEM->rx_head[i].base = offset;
+		MEM->rx_head[i].flag = TMD1_OWN_CHIP;
+		MEM->rx_head[i].base_hi = 0;
+		MEM->rx_head[i].buf_length = -PKT_BUF_SZ;
+		MEM->rx_head[i].msg_length = 0;
+		offset += PKT_BUF_SZ;
+	}
+}
+
+
+static int lance_start_xmit( struct sk_buff *skb, struct device *dev )
+
+{	struct lance_private *lp = (struct lance_private *)dev->priv;
+	struct lance_ioreg	 *IO = lp->iobase;
+	int entry, len;
+	struct lance_tx_head *head;
+	unsigned long flags;
+	
+	/* Transmitter timeout, serious problems. */
+	if (dev->tbusy) {
+		int tickssofar = jiffies - dev->trans_start;
+		if (tickssofar < 20)
+			return( 1 );
+		AREG = CSR0;
+		DPRINTK( 1, ( "%s: transmit timed out, status %04x, resetting.\n",
+					  dev->name, DREG ));
+		DREG = CSR0_STOP;
+		/*
+		 * Always set BSWP after a STOP as STOP puts it back into
+		 * little endian mode.
+		 */
+		REGA( CSR3 ) = CSR3_BSWP | (lp->cardtype == PAM_CARD ? CSR3_ACON : 0); 
+		lp->stats.tx_errors++;
+#ifndef final_version
+		{	int i;
+			DPRINTK( 2, ( "Ring data: dirty_tx %d cur_tx %d%s cur_rx %d\n",
+						  lp->dirty_tx, lp->cur_tx,
+						  lp->tx_full ? " (full)" : "",
+						  lp->cur_rx ));
+			for( i = 0 ; i < RX_RING_SIZE; i++ )
+				DPRINTK( 2, ( "rx #%d: base=%04x blen=%04x mlen=%04x\n",
+							  i, MEM->rx_head[i].base,
+							  -MEM->rx_head[i].buf_length,
+							  MEM->rx_head[i].msg_length ));
+			for( i = 0 ; i < TX_RING_SIZE; i++ )
+				DPRINTK( 2, ( "tx #%d: base=%04x len=%04x misc=%04x\n",
+							  i, MEM->tx_head[i].base,
+							  -MEM->tx_head[i].length,
+							  MEM->tx_head[i].misc ));
+		}
+#endif
+		lance_init_ring(dev);
+		REGA( CSR0 ) = CSR0_INEA | CSR0_INIT | CSR0_STRT;
+
+		dev->tbusy = 0;
+		dev->trans_start = jiffies;
+
+		return( 0 );
+	}
+
+	if (skb == NULL) {
+		dev_tint( dev );
+		return( 0 );
+	}
+
+	if (skb->len <= 0)
+		return( 0 );
+
+	DPRINTK( 2, ( "%s: lance_start_xmit() called, csr0 %4.4x.\n",
+				  dev->name, DREG ));
+
+	/* 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 (set_bit( 0, (void*)&dev->tbusy ) != 0) {
+		DPRINTK( 0, ( "%s: Transmitter access conflict.\n", dev->name ));
+		return 1;
+	}
+
+	if (set_bit( 0, (void*)&lp->lock ) != 0) {
+		DPRINTK( 0, ( "%s: tx queue lock!.\n", dev->name ));
+		/* don't clear dev->tbusy flag. */
+		return 1;
+	}
+
+	/* Fill in a Tx ring entry */
+	if (lance_debug >= 3) {
+		u_char *p;
+		int i;
+		printk( "%s: TX pkt type 0x%04x from ", dev->name,
+				((u_short *)skb->data)[6]);
+		for( p = &((u_char *)skb->data)[6], i = 0; i < 6; i++ )
+			printk("%02x%s", *p++, i != 5 ? ":" : "" );
+		printk(" to ");
+		for( p = (u_char *)skb->data, i = 0; i < 6; i++ )
+			printk("%02x%s", *p++, i != 5 ? ":" : "" );
+		printk(" data at 0x%08x len %d\n", (int)skb->data,
+			   (int)skb->len );
+	}
+
+	/* We're not prepared for the int until the last flags are set/reset. And
+	 * the int may happen already after setting the OWN_CHIP... */
+	save_flags(flags);
+	cli();
+
+	/* Mask to ring buffer boundary. */
+	entry = lp->cur_tx & TX_RING_MOD_MASK;
+	head  = &(MEM->tx_head[entry]);
+	
+	/* Caution: the write order is important here, set the "ownership" bits
+	 * last.
+	 */
+
+	/* The old LANCE chips doesn't automatically pad buffers to min. size. */
+	len = (ETH_ZLEN < skb->len) ? skb->len : ETH_ZLEN;
+	/* PAM-Card has a bug: Can only send packets with even number of bytes! */
+	if (lp->cardtype == PAM_CARD && (len & 1))
+		++len;
+
+	head->length = -len;
+	head->misc = 0;
+	lp->memcpy_f( PKTBUF_ADDR(head), (void *)skb->data, skb->len );
+	head->flag = TMD1_OWN_CHIP | TMD1_ENP | TMD1_STP;
+	dev_kfree_skb( skb, FREE_WRITE );
+	lp->cur_tx++;
+	while( lp->cur_tx >= TX_RING_SIZE && lp->dirty_tx >= TX_RING_SIZE ) {
+		lp->cur_tx -= TX_RING_SIZE;
+		lp->dirty_tx -= TX_RING_SIZE;
+	}
+
+	/* Trigger an immediate send poll. */
+	DREG = CSR0_INEA | CSR0_TDMD;
+	dev->trans_start = jiffies;
+
+	lp->lock = 0;
+	if ((MEM->tx_head[(entry+1) & TX_RING_MOD_MASK].flag & TMD1_OWN) ==
+		TMD1_OWN_HOST)
+		dev->tbusy = 0;
+	else
+		lp->tx_full = 1;
+	restore_flags(flags);
+
+	return 0;
+}
+
+/* The LANCE interrupt handler. */
+
+static void lance_interrupt( int irq, struct pt_regs *fp, struct device *dev )
+
+{	struct lance_private *lp;
+	struct lance_ioreg	 *IO;
+	int csr0, boguscnt = 10;
+
+	if (dev == NULL) {
+		DPRINTK( 1, ( "lance_interrupt(): interrupt for unknown device.\n" ));
+		return;
+	}
+
+	lp = (struct lance_private *)dev->priv;
+	IO = lp->iobase;
+	AREG = CSR0;
+
+	if (dev->interrupt)
+		DPRINTK( 2, ( "%s: Re-entering the interrupt handler.\n", dev->name ));
+	dev->interrupt = 1;
+
+	while( ((csr0 = DREG) & (CSR0_ERR | CSR0_TINT | CSR0_RINT)) &&
+		   --boguscnt >= 0) {
+		/* Acknowledge all of the current interrupt sources ASAP. */
+		DREG = csr0 & ~(CSR0_INIT | CSR0_STRT | CSR0_STOP |
+									CSR0_TDMD | CSR0_INEA);
+
+		DPRINTK( 2, ( "%s: interrupt  csr0=%04x new csr=%04x.\n",
+					  dev->name, csr0, DREG ));
+
+		if (csr0 & CSR0_RINT)			/* Rx interrupt */
+			lance_rx( dev );
+
+		if (csr0 & CSR0_TINT) {			/* Tx-done interrupt */
+			int dirty_tx = lp->dirty_tx;
+
+			while( dirty_tx < lp->cur_tx) {
+				int entry = dirty_tx & TX_RING_MOD_MASK;
+				int status = MEM->tx_head[entry].flag;
+			
+				if (status & TMD1_OWN_CHIP)
+					break;			/* It still hasn't been Txed */
+
+				MEM->tx_head[entry].flag = 0;
+
+				if (status & TMD1_ERR) {
+					/* There was an major error, log it. */
+					int err_status = MEM->tx_head[entry].misc;
+					lp->stats.tx_errors++;
+					if (err_status & TMD3_RTRY) lp->stats.tx_aborted_errors++;
+					if (err_status & TMD3_LCAR) lp->stats.tx_carrier_errors++;
+					if (err_status & TMD3_LCOL) lp->stats.tx_window_errors++;
+					if (err_status & TMD3_UFLO) {
+						/* Ackk!  On FIFO errors the Tx unit is turned off! */
+						lp->stats.tx_fifo_errors++;
+						/* Remove this verbosity later! */
+						DPRINTK( 1, ( "%s: Tx FIFO error! Status %04x\n",
+									  dev->name, csr0 ));
+						/* Restart the chip. */
+						DREG = CSR0_STRT;
+					}
+				} else {
+					if (status & (TMD1_MORE | TMD1_ONE | TMD1_DEF))
+						lp->stats.collisions++;
+					lp->stats.tx_packets++;
+				}
+				dirty_tx++;
+			}
+
+#ifndef final_version
+			if (lp->cur_tx - dirty_tx >= TX_RING_SIZE) {
+				DPRINTK( 0, ( "out-of-sync dirty pointer,"
+							  " %d vs. %d, full=%d.\n",
+							  dirty_tx, lp->cur_tx, lp->tx_full ));
+				dirty_tx += TX_RING_SIZE;
+			}
+#endif
+
+			if (lp->tx_full && dev->tbusy
+				&& dirty_tx > lp->cur_tx - TX_RING_SIZE + 2) {
+				/* The ring is no longer full, clear tbusy. */
+				lp->tx_full = 0;
+				dev->tbusy = 0;
+				mark_bh( NET_BH );
+			}
+
+			lp->dirty_tx = dirty_tx;
+		}
+
+		/* Log misc errors. */
+		if (csr0 & CSR0_BABL) lp->stats.tx_errors++; /* Tx babble. */
+		if (csr0 & CSR0_MISS) lp->stats.rx_errors++; /* Missed a Rx frame. */
+		if (csr0 & CSR0_MERR) {
+			DPRINTK( 1, ( "%s: Bus master arbitration failure (?!?), "
+						  "status %04x.\n", dev->name, csr0 ));
+			/* Restart the chip. */
+			DREG = CSR0_STRT;
+		}
+	}
+
+    /* Clear any other interrupt, and set interrupt enable. */
+	DREG = CSR0_BABL | CSR0_CERR | CSR0_MISS | CSR0_MERR |
+		   CSR0_IDON | CSR0_INEA;
+
+	DPRINTK( 2, ( "%s: exiting interrupt, csr0=%#04x.\n",
+				  dev->name, DREG ));
+	dev->interrupt = 0;
+	return;
+}
+
+
+static int lance_rx( struct device *dev )
+
+{	struct lance_private *lp = (struct lance_private *)dev->priv;
+	int entry = lp->cur_rx & RX_RING_MOD_MASK;
+	int i;
+
+	DPRINTK( 2, ( "%s: rx int, flag=%04x\n", dev->name,
+				  MEM->rx_head[entry].flag ));
+	
+	/* If we own the next entry, it's a new packet. Send it up. */
+	while( (MEM->rx_head[entry].flag & RMD1_OWN) == RMD1_OWN_HOST ) {
+		struct lance_rx_head *head = &(MEM->rx_head[entry]);
+		int status = head->flag;
+		
+		if (status != (RMD1_ENP|RMD1_STP)) {		/* There was an error. */
+			/* There is a tricky error noted by John Murphy,
+			   <murf@perftech.com> to Russ Nelson: Even with full-sized
+			   buffers it's possible for a jabber packet to use two
+			   buffers, with only the last correctly noting the error. */
+			if (status & RMD1_ENP)	/* Only count a general error at the */
+				lp->stats.rx_errors++; /* end of a packet.*/
+			if (status & RMD1_FRAM) lp->stats.rx_frame_errors++;
+			if (status & RMD1_OFLO) lp->stats.rx_over_errors++;
+			if (status & RMD1_CRC) lp->stats.rx_crc_errors++;
+			if (status & RMD1_BUFF) lp->stats.rx_fifo_errors++;
+			head->flag &= (RMD1_ENP|RMD1_STP);
+		} else {
+			/* Malloc up new buffer, compatible with net-3. */
+			short pkt_len = head->msg_length & 0xfff;
+			struct sk_buff *skb;
+
+			if (pkt_len < 60) {
+				printk( "%s: Runt packet!\n", dev->name );
+				lp->stats.rx_errors++;
+			}
+			else {
+				skb = dev_alloc_skb( pkt_len+2 );
+				if (skb == NULL) {
+					DPRINTK( 1, ( "%s: Memory squeeze, deferring packet.\n",
+								  dev->name ));
+					for( i = 0; i < RX_RING_SIZE; i++ )
+						if (MEM->rx_head[(entry+i) & RX_RING_MOD_MASK].flag &
+							RMD1_OWN_CHIP)
+							break;
+					
+					if (i > RX_RING_SIZE - 2) {
+						lp->stats.rx_dropped++;
+						head->flag |= RMD1_OWN_CHIP;
+						lp->cur_rx++;
+					}
+					break;
+				}
+
+				if (lance_debug >= 3) {
+					u_char *data = PKTBUF_ADDR(head), *p;
+					printk( "%s: RX pkt type 0x%04x from ", dev->name,
+							((u_short *)data)[6]);
+					for( p = &data[6], i = 0; i < 6; i++ )
+						printk("%02x%s", *p++, i != 5 ? ":" : "" );
+					printk(" to ");
+					for( p = data, i = 0; i < 6; i++ )
+						printk("%02x%s", *p++, i != 5 ? ":" : "" );
+					printk(" data %02x %02x %02x %02x %02x %02x %02x %02x "
+						   "len %d\n",
+						   data[15], data[16], data[17], data[18],
+						   data[19], data[20], data[21], data[22],
+						   pkt_len );
+				}
+				
+				skb->dev = dev;
+				skb_reserve( skb, 2 );	/* 16 byte align */
+				skb_put( skb, pkt_len );	/* Make room */
+				lp->memcpy_f( skb->data, PKTBUF_ADDR(head), pkt_len );
+				skb->protocol = eth_type_trans( skb, dev );
+				netif_rx( skb );
+				lp->stats.rx_packets++;
+			}
+		}
+
+		head->flag |= RMD1_OWN_CHIP;
+		entry = (++lp->cur_rx) & RX_RING_MOD_MASK;
+	}
+	lp->cur_rx &= RX_RING_MOD_MASK;
+
+	/* From lance.c (Donald Becker): */
+	/* We should check that at least two ring entries are free.	 If not,
+	   we should free one and mark stats->rx_dropped++. */
+
+	return 0;
+}
+
+
+static int lance_close( struct device *dev )
+
+{	struct lance_private *lp = (struct lance_private *)dev->priv;
+	struct lance_ioreg	 *IO = lp->iobase;
+
+	dev->start = 0;
+	dev->tbusy = 1;
+
+	AREG = CSR0;
+
+	DPRINTK( 2, ( "%s: Shutting down ethercard, status was %2.2x.\n",
+				  dev->name, DREG ));
+
+	/* We stop the LANCE here -- it occasionally polls
+	   memory if we don't. */
+	DREG = CSR0_STOP;
+
+	MOD_DEC_USE_COUNT;
+	return 0;
+}
+
+
+static struct enet_statistics *lance_get_stats( struct device *dev )
+
+{	struct lance_private *lp = (struct lance_private *)dev->priv;
+
+	return &lp->stats;
+}
+
+
+/* Set or clear the multicast filter for this adaptor.
+   num_addrs == -1		Promiscuous mode, receive all packets
+   num_addrs == 0		Normal mode, clear multicast list
+   num_addrs > 0		Multicast mode, receive normal and MC packets, and do
+						best-effort filtering.
+ */
+
+static void set_multicast_list( struct device *dev )
+
+{	struct lance_private *lp = (struct lance_private *)dev->priv;
+	struct lance_ioreg	 *IO = lp->iobase;
+
+	if (!dev->start)
+		/* Only possible if board is already started */
+		return;
+	
+	/* We take the simple way out and always enable promiscuous mode. */
+	DREG = CSR0_STOP; /* Temporarily stop the lance. */
+
+	if (dev->flags & IFF_PROMISC) {
+		/* Log any net taps. */
+		DPRINTK( 1, ( "%s: Promiscuous mode enabled.\n", dev->name ));
+		REGA( CSR15 ) = 0x8000; /* Set promiscuous mode */
+	} else {
+		short multicast_table[4];
+		int num_addrs = dev->mc_count;
+		int i;
+		/* We don't use the multicast table, but rely on upper-layer
+		 * filtering. */
+		memset( multicast_table, (num_addrs == 0) ? 0 : -1,
+				sizeof(multicast_table) );
+		for( i = 0; i < 4; i++ )
+			REGA( CSR8+i ) = multicast_table[i];
+		REGA( CSR15 ) = 0; /* Unset promiscuous mode */
+	}
+
+	/*
+	 * Always set BSWP after a STOP as STOP puts it back into
+	 * little endian mode.
+	 */
+	REGA( CSR3 ) = CSR3_BSWP | (lp->cardtype == PAM_CARD ? CSR3_ACON : 0); 
+
+	/* Resume normal operation and reset AREG to CSR0 */
+	REGA( CSR0 ) = CSR0_IDON | CSR0_INEA | CSR0_STRT;
+}
+
+
+/* This is needed for old RieblCards and possible for new RieblCards */
+
+static int lance_set_mac_address( struct device *dev, void *addr )
+
+{	struct lance_private *lp = (struct lance_private *)dev->priv;
+	struct sockaddr *saddr = addr;
+	int i;
+	
+	if (lp->cardtype != OLD_RIEBL && lp->cardtype != NEW_RIEBL)
+		return( -EOPNOTSUPP );
+
+	if (dev->start) {
+		/* Only possible while card isn't started */
+		DPRINTK( 1, ( "%s: hwaddr can be set only while card isn't open.\n",
+					  dev->name ));
+		return( -EIO );
+	}
+
+	memcpy( dev->dev_addr, saddr->sa_data, dev->addr_len );
+	for( i = 0; i < 6; i++ )
+		MEM->init.hwaddr[i] = dev->dev_addr[i^1]; /* <- 16 bit swap! */
+	lp->memcpy_f( RIEBL_HWADDR_ADDR, dev->dev_addr, 6 );
+	/* set also the magic for future sessions */
+	*RIEBL_MAGIC_ADDR = RIEBL_MAGIC;
+	
+	return( 0 );
+}
+
+
+#ifdef MODULE
+static char devicename[9] = { 0, };
+
+static struct device atarilance_dev =  
+{
+	devicename,	/* filled in by register_netdev() */
+	0, 0, 0, 0,	/* memory */
+	0, 0,		/* base, irq */
+	0, 0, 0, NULL, atarilance_probe,
+};
+
+int init_module(void)
+
+{	int err;
+	
+	if ((err = register_netdev( &atarilance_dev ))) {
+		if (err == -EIO)  {
+			printk( "No Atari Lance board found. Module not loaded.\n");
+		}
+		return( err );
+	}
+	return( 0 );
+}  
+
+void cleanup_module(void)
+
+{
+	unregister_netdev( &atarilance_dev );
+}
+                      
+#endif /* MODULE */
+
+
+/*
+ * Local variables:
+ *  c-indent-level: 4
+ *  tab-width: 4
+ * End:
+ */