1 /* sun3lance.c: Ethernet driver for SUN3 Lance chip */
2 /*
3 
4   Sun3 Lance ethernet driver, by Sam Creasey (sammy@users.qual.net).
5   This driver is a part of the linux kernel, and is thus distributed
6   under the GNU General Public License.
7 
8   The values used in LANCE_OBIO and LANCE_IRQ seem to be empirically
9   true for the correct IRQ and address of the lance registers.  They
10   have not been widely tested, however.  What we probably need is a
11   "proper" way to search for a device in the sun3's prom, but, alas,
12   linux has no such thing.
13 
14   This driver is largely based on atarilance.c, by Roman Hodek.  Other
15   sources of inspiration were the NetBSD sun3 am7990 driver, and the
16   linux sparc lance driver (sunlance.c).
17 
18   There are more assumptions made throughout this driver, it almost
19   certainly still needs work, but it does work at least for RARP/BOOTP and
20   mounting the root NFS filesystem.
21 
22 */
23 
24 static char *version = "sun3lance.c: v1.2 1/12/2001  Sam Creasey (sammy@sammy.net)\n";
25 
26 #include <linux/module.h>
27 #include <linux/stddef.h>
28 #include <linux/kernel.h>
29 #include <linux/string.h>
30 #include <linux/errno.h>
31 #include <linux/interrupt.h>
32 #include <linux/init.h>
33 #include <linux/ioport.h>
34 #include <linux/delay.h>
35 #include <linux/netdevice.h>
36 #include <linux/etherdevice.h>
37 #include <linux/skbuff.h>
38 #include <linux/bitops.h>
39 
40 #include <asm/cacheflush.h>
41 #include <asm/setup.h>
42 #include <asm/irq.h>
43 #include <asm/io.h>
44 #include <asm/pgtable.h>
45 #include <asm/dvma.h>
46 #include <asm/idprom.h>
47 #include <asm/machines.h>
48 
49 #ifdef CONFIG_SUN3
50 #include <asm/sun3mmu.h>
51 #else
52 #include <asm/sun3xprom.h>
53 #endif
54 
55 /* sun3/60 addr/irq for the lance chip.  If your sun is different,
56    change this. */
57 #define LANCE_OBIO 0x120000
58 #define LANCE_IRQ IRQ_AUTO_3
59 
60 /* Debug level:
61  *  0 = silent, print only serious errors
62  *  1 = normal, print error messages
63  *  2 = debug, print debug infos
64  *  3 = debug, print even more debug infos (packet data)
65  */
66 
67 #define	LANCE_DEBUG	0
68 
69 #ifdef LANCE_DEBUG
70 static int lance_debug = LANCE_DEBUG;
71 #else
72 static int lance_debug = 1;
73 #endif
74 module_param(lance_debug, int, 0);
75 MODULE_PARM_DESC(lance_debug, "SUN3 Lance debug level (0-3)");
76 MODULE_LICENSE("GPL");
77 
78 #define	DPRINTK(n,a) \
79 	do {  \
80 		if (lance_debug >= n)  \
81 			printk a; \
82 	} while( 0 )
83 
84 
85 /* we're only using 32k of memory, so we use 4 TX
86    buffers and 16 RX buffers.  These values are expressed as log2. */
87 
88 #define TX_LOG_RING_SIZE			3
89 #define RX_LOG_RING_SIZE			5
90 
91 /* These are the derived values */
92 
93 #define TX_RING_SIZE			(1 << TX_LOG_RING_SIZE)
94 #define TX_RING_LEN_BITS		(TX_LOG_RING_SIZE << 5)
95 #define	TX_RING_MOD_MASK		(TX_RING_SIZE - 1)
96 
97 #define RX_RING_SIZE			(1 << RX_LOG_RING_SIZE)
98 #define RX_RING_LEN_BITS		(RX_LOG_RING_SIZE << 5)
99 #define	RX_RING_MOD_MASK		(RX_RING_SIZE - 1)
100 
101 /* Definitions for packet buffer access: */
102 #define PKT_BUF_SZ		1544
103 
104 /* Get the address of a packet buffer corresponding to a given buffer head */
105 #define	PKTBUF_ADDR(head)	(void *)((unsigned long)(MEM) | (head)->base)
106 
107 
108 /* The LANCE Rx and Tx ring descriptors. */
109 struct lance_rx_head {
110 	unsigned short	base;		/* Low word of base addr */
111 	volatile unsigned char	flag;
112 	unsigned char  base_hi;	/* High word of base addr (unused) */
113 	short buf_length;	/* This length is 2s complement! */
114 	volatile short msg_length;	/* This length is "normal". */
115 };
116 
117 struct lance_tx_head {
118 	unsigned short base;		/* Low word of base addr */
119 	volatile unsigned char	flag;
120 	unsigned char base_hi;	/* High word of base addr (unused) */
121 	short length;		/* Length is 2s complement! */
122 	volatile short misc;
123 };
124 
125 /* The LANCE initialization block, described in databook. */
126 struct lance_init_block {
127 	unsigned short	mode;		/* Pre-set mode */
128 	unsigned char	hwaddr[6];	/* Physical ethernet address */
129 	unsigned int    filter[2];	/* Multicast filter (unused). */
130 	/* Receive and transmit ring base, along with length bits. */
131 	unsigned short rdra;
132 	unsigned short rlen;
133 	unsigned short tdra;
134 	unsigned short tlen;
135 	unsigned short pad[4]; /* is thie needed? */
136 };
137 
138 /* The whole layout of the Lance shared memory */
139 struct lance_memory {
140 	struct lance_init_block	init;
141 	struct lance_tx_head	tx_head[TX_RING_SIZE];
142 	struct lance_rx_head	rx_head[RX_RING_SIZE];
143 	char   rx_data[RX_RING_SIZE][PKT_BUF_SZ];
144 	char   tx_data[TX_RING_SIZE][PKT_BUF_SZ];
145 };
146 
147 /* The driver's private device structure */
148 
149 struct lance_private {
150 	volatile unsigned short	*iobase;
151 	struct lance_memory	*mem;
152      	int new_rx, new_tx;	/* The next free ring entry */
153 	int old_tx, old_rx;     /* ring entry to be processed */
154 /* These two must be longs for set_bit() */
155 	long	    tx_full;
156 	long	    lock;
157 };
158 
159 /* I/O register access macros */
160 
161 #define	MEM	lp->mem
162 #define	DREG	lp->iobase[0]
163 #define	AREG	lp->iobase[1]
164 #define	REGA(a)	(*( AREG = (a), &DREG ))
165 
166 /* Definitions for the Lance */
167 
168 /* tx_head flags */
169 #define TMD1_ENP		0x01	/* end of packet */
170 #define TMD1_STP		0x02	/* start of packet */
171 #define TMD1_DEF		0x04	/* deferred */
172 #define TMD1_ONE		0x08	/* one retry needed */
173 #define TMD1_MORE		0x10	/* more than one retry needed */
174 #define TMD1_ERR		0x40	/* error summary */
175 #define TMD1_OWN 		0x80	/* ownership (set: chip owns) */
176 
177 #define TMD1_OWN_CHIP	TMD1_OWN
178 #define TMD1_OWN_HOST	0
179 
180 /* tx_head misc field */
181 #define TMD3_TDR		0x03FF	/* Time Domain Reflectometry counter */
182 #define TMD3_RTRY		0x0400	/* failed after 16 retries */
183 #define TMD3_LCAR		0x0800	/* carrier lost */
184 #define TMD3_LCOL		0x1000	/* late collision */
185 #define TMD3_UFLO		0x4000	/* underflow (late memory) */
186 #define TMD3_BUFF		0x8000	/* buffering error (no ENP) */
187 
188 /* rx_head flags */
189 #define RMD1_ENP		0x01	/* end of packet */
190 #define RMD1_STP		0x02	/* start of packet */
191 #define RMD1_BUFF		0x04	/* buffer error */
192 #define RMD1_CRC		0x08	/* CRC error */
193 #define RMD1_OFLO		0x10	/* overflow */
194 #define RMD1_FRAM		0x20	/* framing error */
195 #define RMD1_ERR		0x40	/* error summary */
196 #define RMD1_OWN 		0x80	/* ownership (set: ship owns) */
197 
198 #define RMD1_OWN_CHIP	RMD1_OWN
199 #define RMD1_OWN_HOST	0
200 
201 /* register names */
202 #define CSR0	0		/* mode/status */
203 #define CSR1	1		/* init block addr (low) */
204 #define CSR2	2		/* init block addr (high) */
205 #define CSR3	3		/* misc */
206 #define CSR8	8	  	/* address filter */
207 #define CSR15	15		/* promiscuous mode */
208 
209 /* CSR0 */
210 /* (R=readable, W=writeable, S=set on write, C=clear on write) */
211 #define CSR0_INIT	0x0001		/* initialize (RS) */
212 #define CSR0_STRT	0x0002		/* start (RS) */
213 #define CSR0_STOP	0x0004		/* stop (RS) */
214 #define CSR0_TDMD	0x0008		/* transmit demand (RS) */
215 #define CSR0_TXON	0x0010		/* transmitter on (R) */
216 #define CSR0_RXON	0x0020		/* receiver on (R) */
217 #define CSR0_INEA	0x0040		/* interrupt enable (RW) */
218 #define CSR0_INTR	0x0080		/* interrupt active (R) */
219 #define CSR0_IDON	0x0100		/* initialization done (RC) */
220 #define CSR0_TINT	0x0200		/* transmitter interrupt (RC) */
221 #define CSR0_RINT	0x0400		/* receiver interrupt (RC) */
222 #define CSR0_MERR	0x0800		/* memory error (RC) */
223 #define CSR0_MISS	0x1000		/* missed frame (RC) */
224 #define CSR0_CERR	0x2000		/* carrier error (no heartbeat :-) (RC) */
225 #define CSR0_BABL	0x4000		/* babble: tx-ed too many bits (RC) */
226 #define CSR0_ERR	0x8000		/* error (RC) */
227 
228 /* CSR3 */
229 #define CSR3_BCON	0x0001		/* byte control */
230 #define CSR3_ACON	0x0002		/* ALE control */
231 #define CSR3_BSWP	0x0004		/* byte swap (1=big endian) */
232 
233 /***************************** Prototypes *****************************/
234 
235 static int lance_probe( struct net_device *dev);
236 static int lance_open( struct net_device *dev );
237 static void lance_init_ring( struct net_device *dev );
238 static int lance_start_xmit( struct sk_buff *skb, struct net_device *dev );
239 static irqreturn_t lance_interrupt( int irq, void *dev_id);
240 static int lance_rx( struct net_device *dev );
241 static int lance_close( struct net_device *dev );
242 static void set_multicast_list( struct net_device *dev );
243 
244 /************************* End of Prototypes **************************/
245 
246 struct net_device * __init sun3lance_probe(int unit)
247 {
248 	struct net_device *dev;
249 	static int found;
250 	int err = -ENODEV;
251 
252 	if (!MACH_IS_SUN3 && !MACH_IS_SUN3X)
253 		return ERR_PTR(-ENODEV);
254 
255 	/* check that this machine has an onboard lance */
256 	switch(idprom->id_machtype) {
257 	case SM_SUN3|SM_3_50:
258 	case SM_SUN3|SM_3_60:
259 	case SM_SUN3X|SM_3_80:
260 		/* these machines have lance */
261 		break;
262 
263 	default:
264 		return ERR_PTR(-ENODEV);
265 	}
266 
267 	if (found)
268 		return ERR_PTR(-ENODEV);
269 
270 	dev = alloc_etherdev(sizeof(struct lance_private));
271 	if (!dev)
272 		return ERR_PTR(-ENOMEM);
273 	if (unit >= 0) {
274 		sprintf(dev->name, "eth%d", unit);
275 		netdev_boot_setup_check(dev);
276 	}
277 
278 	if (!lance_probe(dev))
279 		goto out;
280 
281 	err = register_netdev(dev);
282 	if (err)
283 		goto out1;
284 	found = 1;
285 	return dev;
286 
287 out1:
288 #ifdef CONFIG_SUN3
289 	iounmap((void __iomem *)dev->base_addr);
290 #endif
291 out:
292 	free_netdev(dev);
293 	return ERR_PTR(err);
294 }
295 
296 static const struct net_device_ops lance_netdev_ops = {
297 	.ndo_open		= lance_open,
298 	.ndo_stop		= lance_close,
299 	.ndo_start_xmit		= lance_start_xmit,
300 	.ndo_set_rx_mode	= set_multicast_list,
301 	.ndo_set_mac_address	= NULL,
302 	.ndo_change_mtu		= eth_change_mtu,
303 	.ndo_validate_addr	= eth_validate_addr,
304 };
305 
306 static int __init lance_probe( struct net_device *dev)
307 {
308 	unsigned long ioaddr;
309 
310 	struct lance_private	*lp;
311 	int 			i;
312 	static int 		did_version;
313 	volatile unsigned short *ioaddr_probe;
314 	unsigned short tmp1, tmp2;
315 
316 #ifdef CONFIG_SUN3
317 	ioaddr = (unsigned long)ioremap(LANCE_OBIO, PAGE_SIZE);
318 	if (!ioaddr)
319 		return 0;
320 #else
321 	ioaddr = SUN3X_LANCE;
322 #endif
323 
324 	/* test to see if there's really a lance here */
325 	/* (CSRO_INIT shouldn't be readable) */
326 
327 	ioaddr_probe = (volatile unsigned short *)ioaddr;
328 	tmp1 = ioaddr_probe[0];
329 	tmp2 = ioaddr_probe[1];
330 
331 	ioaddr_probe[1] = CSR0;
332 	ioaddr_probe[0] = CSR0_INIT | CSR0_STOP;
333 
334 	if(ioaddr_probe[0] != CSR0_STOP) {
335 		ioaddr_probe[0] = tmp1;
336 		ioaddr_probe[1] = tmp2;
337 
338 #ifdef CONFIG_SUN3
339 		iounmap((void __iomem *)ioaddr);
340 #endif
341 		return 0;
342 	}
343 
344 	lp = netdev_priv(dev);
345 
346 	/* XXX - leak? */
347 	MEM = dvma_malloc_align(sizeof(struct lance_memory), 0x10000);
348 	if (MEM == NULL) {
349 #ifdef CONFIG_SUN3
350 		iounmap((void __iomem *)ioaddr);
351 #endif
352 		printk(KERN_WARNING "SUN3 Lance couldn't allocate DVMA memory\n");
353 		return 0;
354 	}
355 
356 	lp->iobase = (volatile unsigned short *)ioaddr;
357 	dev->base_addr = (unsigned long)ioaddr; /* informational only */
358 
359 	REGA(CSR0) = CSR0_STOP;
360 
361 	if (request_irq(LANCE_IRQ, lance_interrupt, 0, "SUN3 Lance", dev) < 0) {
362 #ifdef CONFIG_SUN3
363 		iounmap((void __iomem *)ioaddr);
364 #endif
365 		dvma_free((void *)MEM);
366 		printk(KERN_WARNING "SUN3 Lance unable to allocate IRQ\n");
367 		return 0;
368 	}
369 	dev->irq = (unsigned short)LANCE_IRQ;
370 
371 
372 	printk("%s: SUN3 Lance at io %#lx, mem %#lx, irq %d, hwaddr ",
373 		   dev->name,
374 		   (unsigned long)ioaddr,
375 		   (unsigned long)MEM,
376 		   dev->irq);
377 
378 	/* copy in the ethernet address from the prom */
379 	for(i = 0; i < 6 ; i++)
380 	     dev->dev_addr[i] = idprom->id_ethaddr[i];
381 
382 	/* tell the card it's ether address, bytes swapped */
383 	MEM->init.hwaddr[0] = dev->dev_addr[1];
384 	MEM->init.hwaddr[1] = dev->dev_addr[0];
385 	MEM->init.hwaddr[2] = dev->dev_addr[3];
386 	MEM->init.hwaddr[3] = dev->dev_addr[2];
387 	MEM->init.hwaddr[4] = dev->dev_addr[5];
388 	MEM->init.hwaddr[5] = dev->dev_addr[4];
389 
390 	printk("%pM\n", dev->dev_addr);
391 
392 	MEM->init.mode = 0x0000;
393 	MEM->init.filter[0] = 0x00000000;
394 	MEM->init.filter[1] = 0x00000000;
395 	MEM->init.rdra = dvma_vtob(MEM->rx_head);
396 	MEM->init.rlen    = (RX_LOG_RING_SIZE << 13) |
397 		(dvma_vtob(MEM->rx_head) >> 16);
398 	MEM->init.tdra = dvma_vtob(MEM->tx_head);
399 	MEM->init.tlen    = (TX_LOG_RING_SIZE << 13) |
400 		(dvma_vtob(MEM->tx_head) >> 16);
401 
402 	DPRINTK(2, ("initaddr: %08lx rx_ring: %08lx tx_ring: %08lx\n",
403 	       dvma_vtob(&(MEM->init)), dvma_vtob(MEM->rx_head),
404 	       (dvma_vtob(MEM->tx_head))));
405 
406 	if (did_version++ == 0)
407 		printk( version );
408 
409 	dev->netdev_ops = &lance_netdev_ops;
410 //	KLUDGE -- REMOVE ME
411 	set_bit(__LINK_STATE_PRESENT, &dev->state);
412 
413 
414 	return 1;
415 }
416 
417 static int lance_open( struct net_device *dev )
418 {
419 	struct lance_private *lp = netdev_priv(dev);
420 	int i;
421 
422 	DPRINTK( 2, ( "%s: lance_open()\n", dev->name ));
423 
424 	REGA(CSR0) = CSR0_STOP;
425 
426 	lance_init_ring(dev);
427 
428 	/* From now on, AREG is kept to point to CSR0 */
429 	REGA(CSR0) = CSR0_INIT;
430 
431 	i = 1000000;
432 	while (--i > 0)
433 		if (DREG & CSR0_IDON)
434 			break;
435 	if (i <= 0 || (DREG & CSR0_ERR)) {
436 		DPRINTK( 2, ( "lance_open(): opening %s failed, i=%d, csr0=%04x\n",
437 					  dev->name, i, DREG ));
438 		DREG = CSR0_STOP;
439 		return -EIO;
440 	}
441 
442 	DREG = CSR0_IDON | CSR0_STRT | CSR0_INEA;
443 
444 	netif_start_queue(dev);
445 
446 	DPRINTK( 2, ( "%s: LANCE is open, csr0 %04x\n", dev->name, DREG ));
447 
448 	return 0;
449 }
450 
451 
452 /* Initialize the LANCE Rx and Tx rings. */
453 
454 static void lance_init_ring( struct net_device *dev )
455 {
456 	struct lance_private *lp = netdev_priv(dev);
457 	int i;
458 
459 	lp->lock = 0;
460 	lp->tx_full = 0;
461 	lp->new_rx = lp->new_tx = 0;
462 	lp->old_rx = lp->old_tx = 0;
463 
464 	for( i = 0; i < TX_RING_SIZE; i++ ) {
465 		MEM->tx_head[i].base = dvma_vtob(MEM->tx_data[i]);
466 		MEM->tx_head[i].flag = 0;
467  		MEM->tx_head[i].base_hi =
468 			(dvma_vtob(MEM->tx_data[i])) >>16;
469 		MEM->tx_head[i].length = 0;
470 		MEM->tx_head[i].misc = 0;
471 	}
472 
473 	for( i = 0; i < RX_RING_SIZE; i++ ) {
474 		MEM->rx_head[i].base = dvma_vtob(MEM->rx_data[i]);
475 		MEM->rx_head[i].flag = RMD1_OWN_CHIP;
476 		MEM->rx_head[i].base_hi =
477 			(dvma_vtob(MEM->rx_data[i])) >> 16;
478 		MEM->rx_head[i].buf_length = -PKT_BUF_SZ | 0xf000;
479 		MEM->rx_head[i].msg_length = 0;
480 	}
481 
482 	/* tell the card it's ether address, bytes swapped */
483 	MEM->init.hwaddr[0] = dev->dev_addr[1];
484 	MEM->init.hwaddr[1] = dev->dev_addr[0];
485 	MEM->init.hwaddr[2] = dev->dev_addr[3];
486 	MEM->init.hwaddr[3] = dev->dev_addr[2];
487 	MEM->init.hwaddr[4] = dev->dev_addr[5];
488 	MEM->init.hwaddr[5] = dev->dev_addr[4];
489 
490 	MEM->init.mode = 0x0000;
491 	MEM->init.filter[0] = 0x00000000;
492 	MEM->init.filter[1] = 0x00000000;
493 	MEM->init.rdra = dvma_vtob(MEM->rx_head);
494 	MEM->init.rlen    = (RX_LOG_RING_SIZE << 13) |
495 		(dvma_vtob(MEM->rx_head) >> 16);
496 	MEM->init.tdra = dvma_vtob(MEM->tx_head);
497 	MEM->init.tlen    = (TX_LOG_RING_SIZE << 13) |
498 		(dvma_vtob(MEM->tx_head) >> 16);
499 
500 
501 	/* tell the lance the address of its init block */
502 	REGA(CSR1) = dvma_vtob(&(MEM->init));
503 	REGA(CSR2) = dvma_vtob(&(MEM->init)) >> 16;
504 
505 #ifdef CONFIG_SUN3X
506 	REGA(CSR3) = CSR3_BSWP | CSR3_ACON | CSR3_BCON;
507 #else
508 	REGA(CSR3) = CSR3_BSWP;
509 #endif
510 
511 }
512 
513 
514 static int lance_start_xmit( struct sk_buff *skb, struct net_device *dev )
515 {
516 	struct lance_private *lp = netdev_priv(dev);
517 	int entry, len;
518 	struct lance_tx_head *head;
519 	unsigned long flags;
520 
521 	DPRINTK( 1, ( "%s: transmit start.\n",
522 		      dev->name));
523 
524 	/* Transmitter timeout, serious problems. */
525 	if (netif_queue_stopped(dev)) {
526 		int tickssofar = jiffies - dev_trans_start(dev);
527 		if (tickssofar < HZ/5)
528 			return NETDEV_TX_BUSY;
529 
530 		DPRINTK( 1, ( "%s: transmit timed out, status %04x, resetting.\n",
531 					  dev->name, DREG ));
532 		DREG = CSR0_STOP;
533 		/*
534 		 * Always set BSWP after a STOP as STOP puts it back into
535 		 * little endian mode.
536 		 */
537 		REGA(CSR3) = CSR3_BSWP;
538 		dev->stats.tx_errors++;
539 
540 		if(lance_debug >= 2) {
541 			int i;
542 			printk("Ring data: old_tx %d new_tx %d%s new_rx %d\n",
543 			       lp->old_tx, lp->new_tx,
544 			       lp->tx_full ? " (full)" : "",
545 			       lp->new_rx );
546 			for( i = 0 ; i < RX_RING_SIZE; i++ )
547 				printk( "rx #%d: base=%04x blen=%04x mlen=%04x\n",
548 					i, MEM->rx_head[i].base,
549 					-MEM->rx_head[i].buf_length,
550 					MEM->rx_head[i].msg_length);
551 			for( i = 0 ; i < TX_RING_SIZE; i++ )
552 				printk("tx #%d: base=%04x len=%04x misc=%04x\n",
553 				       i, MEM->tx_head[i].base,
554 				       -MEM->tx_head[i].length,
555 				       MEM->tx_head[i].misc );
556 		}
557 
558 		lance_init_ring(dev);
559 		REGA( CSR0 ) = CSR0_INEA | CSR0_INIT | CSR0_STRT;
560 
561 		netif_start_queue(dev);
562 
563 		return NETDEV_TX_OK;
564 	}
565 
566 
567 	/* Block a timer-based transmit from overlapping.  This could better be
568 	   done with atomic_swap(1, dev->tbusy), but set_bit() works as well. */
569 
570 	/* Block a timer-based transmit from overlapping with us by
571 	   stopping the queue for a bit... */
572 
573 	netif_stop_queue(dev);
574 
575 	if (test_and_set_bit( 0, (void*)&lp->lock ) != 0) {
576 		printk( "%s: tx queue lock!.\n", dev->name);
577 		/* don't clear dev->tbusy flag. */
578 		return NETDEV_TX_BUSY;
579 	}
580 
581 	AREG = CSR0;
582   	DPRINTK( 2, ( "%s: lance_start_xmit() called, csr0 %4.4x.\n",
583   				  dev->name, DREG ));
584 
585 #ifdef CONFIG_SUN3X
586 	/* this weirdness doesn't appear on sun3... */
587 	if(!(DREG & CSR0_INIT)) {
588 		DPRINTK( 1, ("INIT not set, reinitializing...\n"));
589 		REGA( CSR0 ) = CSR0_STOP;
590 		lance_init_ring(dev);
591 		REGA( CSR0 ) = CSR0_INIT | CSR0_STRT;
592 	}
593 #endif
594 
595 	/* Fill in a Tx ring entry */
596 #if 0
597 	if (lance_debug >= 2) {
598 		printk( "%s: TX pkt %d type 0x%04x"
599 			" from %s to %s"
600 			" data at 0x%08x len %d\n",
601 			dev->name, lp->new_tx, ((u_short *)skb->data)[6],
602 			DEV_ADDR(&skb->data[6]), DEV_ADDR(skb->data),
603 			(int)skb->data, (int)skb->len );
604 	}
605 #endif
606 	/* We're not prepared for the int until the last flags are set/reset.
607 	 * And the int may happen already after setting the OWN_CHIP... */
608 	local_irq_save(flags);
609 
610 	/* Mask to ring buffer boundary. */
611 	entry = lp->new_tx;
612 	head  = &(MEM->tx_head[entry]);
613 
614 	/* Caution: the write order is important here, set the "ownership" bits
615 	 * last.
616 	 */
617 
618 	/* the sun3's lance needs it's buffer padded to the minimum
619 	   size */
620 	len = (ETH_ZLEN < skb->len) ? skb->len : ETH_ZLEN;
621 
622 //	head->length = -len;
623 	head->length = (-len) | 0xf000;
624 	head->misc = 0;
625 
626 	skb_copy_from_linear_data(skb, PKTBUF_ADDR(head), skb->len);
627 	if (len != skb->len)
628 		memset(PKTBUF_ADDR(head) + skb->len, 0, len-skb->len);
629 
630 	head->flag = TMD1_OWN_CHIP | TMD1_ENP | TMD1_STP;
631 	lp->new_tx = (lp->new_tx + 1) & TX_RING_MOD_MASK;
632 	dev->stats.tx_bytes += skb->len;
633 
634 	/* Trigger an immediate send poll. */
635 	REGA(CSR0) = CSR0_INEA | CSR0_TDMD | CSR0_STRT;
636 	AREG = CSR0;
637   	DPRINTK( 2, ( "%s: lance_start_xmit() exiting, csr0 %4.4x.\n",
638   				  dev->name, DREG ));
639 	dev_kfree_skb(skb);
640 
641 	lp->lock = 0;
642 	if ((MEM->tx_head[(entry+1) & TX_RING_MOD_MASK].flag & TMD1_OWN) ==
643 	    TMD1_OWN_HOST)
644 		netif_start_queue(dev);
645 
646 	local_irq_restore(flags);
647 
648 	return NETDEV_TX_OK;
649 }
650 
651 /* The LANCE interrupt handler. */
652 
653 static irqreturn_t lance_interrupt( int irq, void *dev_id)
654 {
655 	struct net_device *dev = dev_id;
656 	struct lance_private *lp = netdev_priv(dev);
657 	int csr0;
658 	static int in_interrupt;
659 
660 	if (dev == NULL) {
661 		DPRINTK( 1, ( "lance_interrupt(): invalid dev_id\n" ));
662 		return IRQ_NONE;
663 	}
664 
665 	if (in_interrupt)
666 		DPRINTK( 2, ( "%s: Re-entering the interrupt handler.\n", dev->name ));
667 	in_interrupt = 1;
668 
669  still_more:
670 	flush_cache_all();
671 
672 	AREG = CSR0;
673 	csr0 = DREG;
674 
675 	/* ack interrupts */
676 	DREG = csr0 & (CSR0_TINT | CSR0_RINT | CSR0_IDON);
677 
678 	/* clear errors */
679 	if(csr0 & CSR0_ERR)
680 		DREG = CSR0_BABL | CSR0_MERR | CSR0_CERR | CSR0_MISS;
681 
682 
683 	DPRINTK( 2, ( "%s: interrupt  csr0=%04x new csr=%04x.\n",
684 		      dev->name, csr0, DREG ));
685 
686 	if (csr0 & CSR0_TINT) {			/* Tx-done interrupt */
687 		int old_tx = lp->old_tx;
688 
689 //		if(lance_debug >= 3) {
690 //			int i;
691 //
692 //			printk("%s: tx int\n", dev->name);
693 //
694 //			for(i = 0; i < TX_RING_SIZE; i++)
695 //				printk("ring %d flag=%04x\n", i,
696 //				       MEM->tx_head[i].flag);
697 //		}
698 
699 		while( old_tx != lp->new_tx) {
700 			struct lance_tx_head *head = &(MEM->tx_head[old_tx]);
701 
702 			DPRINTK(3, ("on tx_ring %d\n", old_tx));
703 
704 			if (head->flag & TMD1_OWN_CHIP)
705 				break; /* It still hasn't been Txed */
706 
707 			if (head->flag & TMD1_ERR) {
708 				int status = head->misc;
709 				dev->stats.tx_errors++;
710 				if (status & TMD3_RTRY) dev->stats.tx_aborted_errors++;
711 				if (status & TMD3_LCAR) dev->stats.tx_carrier_errors++;
712 				if (status & TMD3_LCOL) dev->stats.tx_window_errors++;
713 				if (status & (TMD3_UFLO | TMD3_BUFF)) {
714 					dev->stats.tx_fifo_errors++;
715 					printk("%s: Tx FIFO error\n",
716 					       dev->name);
717 					REGA(CSR0) = CSR0_STOP;
718 					REGA(CSR3) = CSR3_BSWP;
719 					lance_init_ring(dev);
720 					REGA(CSR0) = CSR0_STRT | CSR0_INEA;
721 					return IRQ_HANDLED;
722 				}
723 			} else if(head->flag & (TMD1_ENP | TMD1_STP)) {
724 
725 				head->flag &= ~(TMD1_ENP | TMD1_STP);
726 				if(head->flag & (TMD1_ONE | TMD1_MORE))
727 					dev->stats.collisions++;
728 
729 				dev->stats.tx_packets++;
730 				DPRINTK(3, ("cleared tx ring %d\n", old_tx));
731 			}
732 			old_tx = (old_tx +1) & TX_RING_MOD_MASK;
733 		}
734 
735 		lp->old_tx = old_tx;
736 	}
737 
738 
739 	if (netif_queue_stopped(dev)) {
740 		/* The ring is no longer full, clear tbusy. */
741 		netif_start_queue(dev);
742 		netif_wake_queue(dev);
743 	}
744 
745 	if (csr0 & CSR0_RINT)			/* Rx interrupt */
746 		lance_rx( dev );
747 
748 	/* Log misc errors. */
749 	if (csr0 & CSR0_BABL) dev->stats.tx_errors++; /* Tx babble. */
750 	if (csr0 & CSR0_MISS) dev->stats.rx_errors++; /* Missed a Rx frame. */
751 	if (csr0 & CSR0_MERR) {
752 		DPRINTK( 1, ( "%s: Bus master arbitration failure (?!?), "
753 			      "status %04x.\n", dev->name, csr0 ));
754 		/* Restart the chip. */
755 		REGA(CSR0) = CSR0_STOP;
756 		REGA(CSR3) = CSR3_BSWP;
757 		lance_init_ring(dev);
758 		REGA(CSR0) = CSR0_STRT | CSR0_INEA;
759 	}
760 
761 
762     /* Clear any other interrupt, and set interrupt enable. */
763 //	DREG = CSR0_BABL | CSR0_CERR | CSR0_MISS | CSR0_MERR |
764 //		   CSR0_IDON | CSR0_INEA;
765 
766 	REGA(CSR0) = CSR0_INEA;
767 
768 	if(DREG & (CSR0_RINT | CSR0_TINT)) {
769 	     DPRINTK(2, ("restarting interrupt, csr0=%#04x\n", DREG));
770 	     goto still_more;
771 	}
772 
773 	DPRINTK( 2, ( "%s: exiting interrupt, csr0=%#04x.\n",
774 				  dev->name, DREG ));
775 	in_interrupt = 0;
776 	return IRQ_HANDLED;
777 }
778 
779 /* get packet, toss into skbuff */
780 static int lance_rx( struct net_device *dev )
781 {
782 	struct lance_private *lp = netdev_priv(dev);
783 	int entry = lp->new_rx;
784 
785 	/* If we own the next entry, it's a new packet. Send it up. */
786 	while( (MEM->rx_head[entry].flag & RMD1_OWN) == RMD1_OWN_HOST ) {
787 		struct lance_rx_head *head = &(MEM->rx_head[entry]);
788 		int status = head->flag;
789 
790 		if (status != (RMD1_ENP|RMD1_STP)) {  /* There was an error. */
791 			/* There is a tricky error noted by John Murphy,
792 			   <murf@perftech.com> to Russ Nelson: Even with
793 			   full-sized buffers it's possible for a jabber packet to use two
794 			   buffers, with only the last correctly noting the error. */
795 			if (status & RMD1_ENP)	/* Only count a general error at the */
796 				dev->stats.rx_errors++; /* end of a packet.*/
797 			if (status & RMD1_FRAM) dev->stats.rx_frame_errors++;
798 			if (status & RMD1_OFLO) dev->stats.rx_over_errors++;
799 			if (status & RMD1_CRC) dev->stats.rx_crc_errors++;
800 			if (status & RMD1_BUFF) dev->stats.rx_fifo_errors++;
801 			head->flag &= (RMD1_ENP|RMD1_STP);
802 		} else {
803 			/* Malloc up new buffer, compatible with net-3. */
804 //			short pkt_len = head->msg_length;// & 0xfff;
805 			short pkt_len = (head->msg_length & 0xfff) - 4;
806 			struct sk_buff *skb;
807 
808 			if (pkt_len < 60) {
809 				printk( "%s: Runt packet!\n", dev->name );
810 				dev->stats.rx_errors++;
811 			}
812 			else {
813 				skb = netdev_alloc_skb(dev, pkt_len + 2);
814 				if (skb == NULL) {
815 					dev->stats.rx_dropped++;
816 					head->msg_length = 0;
817 					head->flag |= RMD1_OWN_CHIP;
818 					lp->new_rx = (lp->new_rx+1) &
819 					     RX_RING_MOD_MASK;
820 				}
821 
822 #if 0
823 				if (lance_debug >= 3) {
824 					u_char *data = PKTBUF_ADDR(head);
825 					printk("%s: RX pkt %d type 0x%04x"
826 					       " from %pM to %pM",
827 					       dev->name, lp->new_tx, ((u_short *)data)[6],
828 					       &data[6], data);
829 
830 					printk(" data %02x %02x %02x %02x %02x %02x %02x %02x "
831 					       "len %d at %08x\n",
832 					       data[15], data[16], data[17], data[18],
833 					       data[19], data[20], data[21], data[22],
834 					       pkt_len, data);
835 				}
836 #endif
837 				if (lance_debug >= 3) {
838 					u_char *data = PKTBUF_ADDR(head);
839 					printk( "%s: RX pkt %d type 0x%04x len %d\n ", dev->name, entry, ((u_short *)data)[6], pkt_len);
840 				}
841 
842 
843 				skb_reserve( skb, 2 );	/* 16 byte align */
844 				skb_put( skb, pkt_len );	/* Make room */
845 				skb_copy_to_linear_data(skb,
846 						 PKTBUF_ADDR(head),
847 						 pkt_len);
848 
849 				skb->protocol = eth_type_trans( skb, dev );
850 				netif_rx( skb );
851 				dev->stats.rx_packets++;
852 				dev->stats.rx_bytes += pkt_len;
853 			}
854 		}
855 
856 //		head->buf_length = -PKT_BUF_SZ | 0xf000;
857 		head->msg_length = 0;
858 		head->flag = RMD1_OWN_CHIP;
859 
860 		entry = lp->new_rx = (lp->new_rx +1) & RX_RING_MOD_MASK;
861 	}
862 
863 	/* From lance.c (Donald Becker): */
864 	/* We should check that at least two ring entries are free.
865 	   If not, we should free one and mark stats->rx_dropped++. */
866 
867 	return 0;
868 }
869 
870 
871 static int lance_close( struct net_device *dev )
872 {
873 	struct lance_private *lp = netdev_priv(dev);
874 
875 	netif_stop_queue(dev);
876 
877 	AREG = CSR0;
878 
879 	DPRINTK( 2, ( "%s: Shutting down ethercard, status was %2.2x.\n",
880 				  dev->name, DREG ));
881 
882 	/* We stop the LANCE here -- it occasionally polls
883 	   memory if we don't. */
884 	DREG = CSR0_STOP;
885 	return 0;
886 }
887 
888 
889 /* Set or clear the multicast filter for this adaptor.
890    num_addrs == -1		Promiscuous mode, receive all packets
891    num_addrs == 0		Normal mode, clear multicast list
892    num_addrs > 0		Multicast mode, receive normal and MC packets, and do
893 						best-effort filtering.
894  */
895 
896 /* completely untested on a sun3 */
897 static void set_multicast_list( struct net_device *dev )
898 {
899 	struct lance_private *lp = netdev_priv(dev);
900 
901 	if(netif_queue_stopped(dev))
902 		/* Only possible if board is already started */
903 		return;
904 
905 	/* We take the simple way out and always enable promiscuous mode. */
906 	DREG = CSR0_STOP; /* Temporarily stop the lance. */
907 
908 	if (dev->flags & IFF_PROMISC) {
909 		/* Log any net taps. */
910 		DPRINTK( 3, ( "%s: Promiscuous mode enabled.\n", dev->name ));
911 		REGA( CSR15 ) = 0x8000; /* Set promiscuous mode */
912 	} else {
913 		short multicast_table[4];
914 		int num_addrs = netdev_mc_count(dev);
915 		int i;
916 		/* We don't use the multicast table, but rely on upper-layer
917 		 * filtering. */
918 		memset( multicast_table, (num_addrs == 0) ? 0 : -1,
919 				sizeof(multicast_table) );
920 		for( i = 0; i < 4; i++ )
921 			REGA( CSR8+i ) = multicast_table[i];
922 		REGA( CSR15 ) = 0; /* Unset promiscuous mode */
923 	}
924 
925 	/*
926 	 * Always set BSWP after a STOP as STOP puts it back into
927 	 * little endian mode.
928 	 */
929 	REGA( CSR3 ) = CSR3_BSWP;
930 
931 	/* Resume normal operation and reset AREG to CSR0 */
932 	REGA( CSR0 ) = CSR0_IDON | CSR0_INEA | CSR0_STRT;
933 }
934 
935 
936 #ifdef MODULE
937 
938 static struct net_device *sun3lance_dev;
939 
940 int __init init_module(void)
941 {
942 	sun3lance_dev = sun3lance_probe(-1);
943 	return PTR_ERR_OR_ZERO(sun3lance_dev);
944 }
945 
946 void __exit cleanup_module(void)
947 {
948 	unregister_netdev(sun3lance_dev);
949 #ifdef CONFIG_SUN3
950 	iounmap((void __iomem *)sun3lance_dev->base_addr);
951 #endif
952 	free_netdev(sun3lance_dev);
953 }
954 
955 #endif /* MODULE */
956 
957