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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
24static const char version[] =
25"sun3lance.c: v1.2 1/12/2001 Sam Creasey (sammy@sammy.net)\n";
26
27#include <linux/module.h>
28#include <linux/stddef.h>
29#include <linux/kernel.h>
30#include <linux/string.h>
31#include <linux/errno.h>
32#include <linux/interrupt.h>
33#include <linux/init.h>
34#include <linux/ioport.h>
35#include <linux/delay.h>
36#include <linux/netdevice.h>
37#include <linux/etherdevice.h>
38#include <linux/skbuff.h>
39#include <linux/bitops.h>
40
41#include <asm/cacheflush.h>
42#include <asm/setup.h>
43#include <asm/irq.h>
44#include <asm/io.h>
45#include <asm/pgtable.h>
46#include <asm/dvma.h>
47#include <asm/idprom.h>
48#include <asm/machines.h>
49
50#ifdef CONFIG_SUN3
51#include <asm/sun3mmu.h>
52#else
53#include <asm/sun3xprom.h>
54#endif
55
56/* sun3/60 addr/irq for the lance chip. If your sun is different,
57 change this. */
58#define LANCE_OBIO 0x120000
59#define LANCE_IRQ IRQ_AUTO_3
60
61/* Debug level:
62 * 0 = silent, print only serious errors
63 * 1 = normal, print error messages
64 * 2 = debug, print debug infos
65 * 3 = debug, print even more debug infos (packet data)
66 */
67
68#define LANCE_DEBUG 0
69
70#ifdef LANCE_DEBUG
71static int lance_debug = LANCE_DEBUG;
72#else
73static int lance_debug = 1;
74#endif
75module_param(lance_debug, int, 0);
76MODULE_PARM_DESC(lance_debug, "SUN3 Lance debug level (0-3)");
77MODULE_LICENSE("GPL");
78
79#define DPRINTK(n,a) \
80 do { \
81 if (lance_debug >= n) \
82 printk a; \
83 } while( 0 )
84
85
86/* we're only using 32k of memory, so we use 4 TX
87 buffers and 16 RX buffers. These values are expressed as log2. */
88
89#define TX_LOG_RING_SIZE 3
90#define RX_LOG_RING_SIZE 5
91
92/* These are the derived values */
93
94#define TX_RING_SIZE (1 << TX_LOG_RING_SIZE)
95#define TX_RING_LEN_BITS (TX_LOG_RING_SIZE << 5)
96#define TX_RING_MOD_MASK (TX_RING_SIZE - 1)
97
98#define RX_RING_SIZE (1 << RX_LOG_RING_SIZE)
99#define RX_RING_LEN_BITS (RX_LOG_RING_SIZE << 5)
100#define RX_RING_MOD_MASK (RX_RING_SIZE - 1)
101
102/* Definitions for packet buffer access: */
103#define PKT_BUF_SZ 1544
104
105/* Get the address of a packet buffer corresponding to a given buffer head */
106#define PKTBUF_ADDR(head) (void *)((unsigned long)(MEM) | (head)->base)
107
108
109/* The LANCE Rx and Tx ring descriptors. */
110struct lance_rx_head {
111 unsigned short base; /* Low word of base addr */
112 volatile unsigned char flag;
113 unsigned char base_hi; /* High word of base addr (unused) */
114 short buf_length; /* This length is 2s complement! */
115 volatile short msg_length; /* This length is "normal". */
116};
117
118struct lance_tx_head {
119 unsigned short base; /* Low word of base addr */
120 volatile unsigned char flag;
121 unsigned char base_hi; /* High word of base addr (unused) */
122 short length; /* Length is 2s complement! */
123 volatile short misc;
124};
125
126/* The LANCE initialization block, described in databook. */
127struct lance_init_block {
128 unsigned short mode; /* Pre-set mode */
129 unsigned char hwaddr[6]; /* Physical ethernet address */
130 unsigned int filter[2]; /* Multicast filter (unused). */
131 /* Receive and transmit ring base, along with length bits. */
132 unsigned short rdra;
133 unsigned short rlen;
134 unsigned short tdra;
135 unsigned short tlen;
136 unsigned short pad[4]; /* is thie needed? */
137};
138
139/* The whole layout of the Lance shared memory */
140struct lance_memory {
141 struct lance_init_block init;
142 struct lance_tx_head tx_head[TX_RING_SIZE];
143 struct lance_rx_head rx_head[RX_RING_SIZE];
144 char rx_data[RX_RING_SIZE][PKT_BUF_SZ];
145 char tx_data[TX_RING_SIZE][PKT_BUF_SZ];
146};
147
148/* The driver's private device structure */
149
150struct lance_private {
151 volatile unsigned short *iobase;
152 struct lance_memory *mem;
153 int new_rx, new_tx; /* The next free ring entry */
154 int old_tx, old_rx; /* ring entry to be processed */
155/* These two must be longs for set_bit() */
156 long tx_full;
157 long lock;
158};
159
160/* I/O register access macros */
161
162#define MEM lp->mem
163#define DREG lp->iobase[0]
164#define AREG lp->iobase[1]
165#define REGA(a) (*( AREG = (a), &DREG ))
166
167/* Definitions for the Lance */
168
169/* tx_head flags */
170#define TMD1_ENP 0x01 /* end of packet */
171#define TMD1_STP 0x02 /* start of packet */
172#define TMD1_DEF 0x04 /* deferred */
173#define TMD1_ONE 0x08 /* one retry needed */
174#define TMD1_MORE 0x10 /* more than one retry needed */
175#define TMD1_ERR 0x40 /* error summary */
176#define TMD1_OWN 0x80 /* ownership (set: chip owns) */
177
178#define TMD1_OWN_CHIP TMD1_OWN
179#define TMD1_OWN_HOST 0
180
181/* tx_head misc field */
182#define TMD3_TDR 0x03FF /* Time Domain Reflectometry counter */
183#define TMD3_RTRY 0x0400 /* failed after 16 retries */
184#define TMD3_LCAR 0x0800 /* carrier lost */
185#define TMD3_LCOL 0x1000 /* late collision */
186#define TMD3_UFLO 0x4000 /* underflow (late memory) */
187#define TMD3_BUFF 0x8000 /* buffering error (no ENP) */
188
189/* rx_head flags */
190#define RMD1_ENP 0x01 /* end of packet */
191#define RMD1_STP 0x02 /* start of packet */
192#define RMD1_BUFF 0x04 /* buffer error */
193#define RMD1_CRC 0x08 /* CRC error */
194#define RMD1_OFLO 0x10 /* overflow */
195#define RMD1_FRAM 0x20 /* framing error */
196#define RMD1_ERR 0x40 /* error summary */
197#define RMD1_OWN 0x80 /* ownership (set: ship owns) */
198
199#define RMD1_OWN_CHIP RMD1_OWN
200#define RMD1_OWN_HOST 0
201
202/* register names */
203#define CSR0 0 /* mode/status */
204#define CSR1 1 /* init block addr (low) */
205#define CSR2 2 /* init block addr (high) */
206#define CSR3 3 /* misc */
207#define CSR8 8 /* address filter */
208#define CSR15 15 /* promiscuous mode */
209
210/* CSR0 */
211/* (R=readable, W=writeable, S=set on write, C=clear on write) */
212#define CSR0_INIT 0x0001 /* initialize (RS) */
213#define CSR0_STRT 0x0002 /* start (RS) */
214#define CSR0_STOP 0x0004 /* stop (RS) */
215#define CSR0_TDMD 0x0008 /* transmit demand (RS) */
216#define CSR0_TXON 0x0010 /* transmitter on (R) */
217#define CSR0_RXON 0x0020 /* receiver on (R) */
218#define CSR0_INEA 0x0040 /* interrupt enable (RW) */
219#define CSR0_INTR 0x0080 /* interrupt active (R) */
220#define CSR0_IDON 0x0100 /* initialization done (RC) */
221#define CSR0_TINT 0x0200 /* transmitter interrupt (RC) */
222#define CSR0_RINT 0x0400 /* receiver interrupt (RC) */
223#define CSR0_MERR 0x0800 /* memory error (RC) */
224#define CSR0_MISS 0x1000 /* missed frame (RC) */
225#define CSR0_CERR 0x2000 /* carrier error (no heartbeat :-) (RC) */
226#define CSR0_BABL 0x4000 /* babble: tx-ed too many bits (RC) */
227#define CSR0_ERR 0x8000 /* error (RC) */
228
229/* CSR3 */
230#define CSR3_BCON 0x0001 /* byte control */
231#define CSR3_ACON 0x0002 /* ALE control */
232#define CSR3_BSWP 0x0004 /* byte swap (1=big endian) */
233
234/***************************** Prototypes *****************************/
235
236static int lance_probe( struct net_device *dev);
237static int lance_open( struct net_device *dev );
238static void lance_init_ring( struct net_device *dev );
239static netdev_tx_t lance_start_xmit(struct sk_buff *skb,
240 struct net_device *dev);
241static irqreturn_t lance_interrupt( int irq, void *dev_id);
242static int lance_rx( struct net_device *dev );
243static int lance_close( struct net_device *dev );
244static void set_multicast_list( struct net_device *dev );
245
246/************************* End of Prototypes **************************/
247
248struct net_device * __init sun3lance_probe(int unit)
249{
250 struct net_device *dev;
251 static int found;
252 int err = -ENODEV;
253
254 if (!MACH_IS_SUN3 && !MACH_IS_SUN3X)
255 return ERR_PTR(-ENODEV);
256
257 /* check that this machine has an onboard lance */
258 switch(idprom->id_machtype) {
259 case SM_SUN3|SM_3_50:
260 case SM_SUN3|SM_3_60:
261 case SM_SUN3X|SM_3_80:
262 /* these machines have lance */
263 break;
264
265 default:
266 return ERR_PTR(-ENODEV);
267 }
268
269 if (found)
270 return ERR_PTR(-ENODEV);
271
272 dev = alloc_etherdev(sizeof(struct lance_private));
273 if (!dev)
274 return ERR_PTR(-ENOMEM);
275 if (unit >= 0) {
276 sprintf(dev->name, "eth%d", unit);
277 netdev_boot_setup_check(dev);
278 }
279
280 if (!lance_probe(dev))
281 goto out;
282
283 err = register_netdev(dev);
284 if (err)
285 goto out1;
286 found = 1;
287 return dev;
288
289out1:
290#ifdef CONFIG_SUN3
291 iounmap((void __iomem *)dev->base_addr);
292#endif
293out:
294 free_netdev(dev);
295 return ERR_PTR(err);
296}
297
298static const struct net_device_ops lance_netdev_ops = {
299 .ndo_open = lance_open,
300 .ndo_stop = lance_close,
301 .ndo_start_xmit = lance_start_xmit,
302 .ndo_set_rx_mode = set_multicast_list,
303 .ndo_set_mac_address = NULL,
304 .ndo_validate_addr = eth_validate_addr,
305};
306
307static int __init lance_probe( struct net_device *dev)
308{
309 unsigned long ioaddr;
310
311 struct lance_private *lp;
312 int i;
313 static int did_version;
314 volatile unsigned short *ioaddr_probe;
315 unsigned short tmp1, tmp2;
316
317#ifdef CONFIG_SUN3
318 ioaddr = (unsigned long)ioremap(LANCE_OBIO, PAGE_SIZE);
319 if (!ioaddr)
320 return 0;
321#else
322 ioaddr = SUN3X_LANCE;
323#endif
324
325 /* test to see if there's really a lance here */
326 /* (CSRO_INIT shouldn't be readable) */
327
328 ioaddr_probe = (volatile unsigned short *)ioaddr;
329 tmp1 = ioaddr_probe[0];
330 tmp2 = ioaddr_probe[1];
331
332 ioaddr_probe[1] = CSR0;
333 ioaddr_probe[0] = CSR0_INIT | CSR0_STOP;
334
335 if(ioaddr_probe[0] != CSR0_STOP) {
336 ioaddr_probe[0] = tmp1;
337 ioaddr_probe[1] = tmp2;
338
339#ifdef CONFIG_SUN3
340 iounmap((void __iomem *)ioaddr);
341#endif
342 return 0;
343 }
344
345 lp = netdev_priv(dev);
346
347 /* XXX - leak? */
348 MEM = dvma_malloc_align(sizeof(struct lance_memory), 0x10000);
349 if (MEM == NULL) {
350#ifdef CONFIG_SUN3
351 iounmap((void __iomem *)ioaddr);
352#endif
353 printk(KERN_WARNING "SUN3 Lance couldn't allocate DVMA memory\n");
354 return 0;
355 }
356
357 lp->iobase = (volatile unsigned short *)ioaddr;
358 dev->base_addr = (unsigned long)ioaddr; /* informational only */
359
360 REGA(CSR0) = CSR0_STOP;
361
362 if (request_irq(LANCE_IRQ, lance_interrupt, 0, "SUN3 Lance", dev) < 0) {
363#ifdef CONFIG_SUN3
364 iounmap((void __iomem *)ioaddr);
365#endif
366 dvma_free((void *)MEM);
367 printk(KERN_WARNING "SUN3 Lance unable to allocate IRQ\n");
368 return 0;
369 }
370 dev->irq = (unsigned short)LANCE_IRQ;
371
372
373 printk("%s: SUN3 Lance at io %#lx, mem %#lx, irq %d, hwaddr ",
374 dev->name,
375 (unsigned long)ioaddr,
376 (unsigned long)MEM,
377 dev->irq);
378
379 /* copy in the ethernet address from the prom */
380 for(i = 0; i < 6 ; i++)
381 dev->dev_addr[i] = idprom->id_ethaddr[i];
382
383 /* tell the card it's ether address, bytes swapped */
384 MEM->init.hwaddr[0] = dev->dev_addr[1];
385 MEM->init.hwaddr[1] = dev->dev_addr[0];
386 MEM->init.hwaddr[2] = dev->dev_addr[3];
387 MEM->init.hwaddr[3] = dev->dev_addr[2];
388 MEM->init.hwaddr[4] = dev->dev_addr[5];
389 MEM->init.hwaddr[5] = dev->dev_addr[4];
390
391 printk("%pM\n", dev->dev_addr);
392
393 MEM->init.mode = 0x0000;
394 MEM->init.filter[0] = 0x00000000;
395 MEM->init.filter[1] = 0x00000000;
396 MEM->init.rdra = dvma_vtob(MEM->rx_head);
397 MEM->init.rlen = (RX_LOG_RING_SIZE << 13) |
398 (dvma_vtob(MEM->rx_head) >> 16);
399 MEM->init.tdra = dvma_vtob(MEM->tx_head);
400 MEM->init.tlen = (TX_LOG_RING_SIZE << 13) |
401 (dvma_vtob(MEM->tx_head) >> 16);
402
403 DPRINTK(2, ("initaddr: %08lx rx_ring: %08lx tx_ring: %08lx\n",
404 dvma_vtob(&(MEM->init)), dvma_vtob(MEM->rx_head),
405 (dvma_vtob(MEM->tx_head))));
406
407 if (did_version++ == 0)
408 printk( version );
409
410 dev->netdev_ops = &lance_netdev_ops;
411// KLUDGE -- REMOVE ME
412 set_bit(__LINK_STATE_PRESENT, &dev->state);
413
414
415 return 1;
416}
417
418static int lance_open( struct net_device *dev )
419{
420 struct lance_private *lp = netdev_priv(dev);
421 int i;
422
423 DPRINTK( 2, ( "%s: lance_open()\n", dev->name ));
424
425 REGA(CSR0) = CSR0_STOP;
426
427 lance_init_ring(dev);
428
429 /* From now on, AREG is kept to point to CSR0 */
430 REGA(CSR0) = CSR0_INIT;
431
432 i = 1000000;
433 while (--i > 0)
434 if (DREG & CSR0_IDON)
435 break;
436 if (i <= 0 || (DREG & CSR0_ERR)) {
437 DPRINTK( 2, ( "lance_open(): opening %s failed, i=%d, csr0=%04x\n",
438 dev->name, i, DREG ));
439 DREG = CSR0_STOP;
440 return -EIO;
441 }
442
443 DREG = CSR0_IDON | CSR0_STRT | CSR0_INEA;
444
445 netif_start_queue(dev);
446
447 DPRINTK( 2, ( "%s: LANCE is open, csr0 %04x\n", dev->name, DREG ));
448
449 return 0;
450}
451
452
453/* Initialize the LANCE Rx and Tx rings. */
454
455static void lance_init_ring( struct net_device *dev )
456{
457 struct lance_private *lp = netdev_priv(dev);
458 int i;
459
460 lp->lock = 0;
461 lp->tx_full = 0;
462 lp->new_rx = lp->new_tx = 0;
463 lp->old_rx = lp->old_tx = 0;
464
465 for( i = 0; i < TX_RING_SIZE; i++ ) {
466 MEM->tx_head[i].base = dvma_vtob(MEM->tx_data[i]);
467 MEM->tx_head[i].flag = 0;
468 MEM->tx_head[i].base_hi =
469 (dvma_vtob(MEM->tx_data[i])) >>16;
470 MEM->tx_head[i].length = 0;
471 MEM->tx_head[i].misc = 0;
472 }
473
474 for( i = 0; i < RX_RING_SIZE; i++ ) {
475 MEM->rx_head[i].base = dvma_vtob(MEM->rx_data[i]);
476 MEM->rx_head[i].flag = RMD1_OWN_CHIP;
477 MEM->rx_head[i].base_hi =
478 (dvma_vtob(MEM->rx_data[i])) >> 16;
479 MEM->rx_head[i].buf_length = -PKT_BUF_SZ | 0xf000;
480 MEM->rx_head[i].msg_length = 0;
481 }
482
483 /* tell the card it's ether address, bytes swapped */
484 MEM->init.hwaddr[0] = dev->dev_addr[1];
485 MEM->init.hwaddr[1] = dev->dev_addr[0];
486 MEM->init.hwaddr[2] = dev->dev_addr[3];
487 MEM->init.hwaddr[3] = dev->dev_addr[2];
488 MEM->init.hwaddr[4] = dev->dev_addr[5];
489 MEM->init.hwaddr[5] = dev->dev_addr[4];
490
491 MEM->init.mode = 0x0000;
492 MEM->init.filter[0] = 0x00000000;
493 MEM->init.filter[1] = 0x00000000;
494 MEM->init.rdra = dvma_vtob(MEM->rx_head);
495 MEM->init.rlen = (RX_LOG_RING_SIZE << 13) |
496 (dvma_vtob(MEM->rx_head) >> 16);
497 MEM->init.tdra = dvma_vtob(MEM->tx_head);
498 MEM->init.tlen = (TX_LOG_RING_SIZE << 13) |
499 (dvma_vtob(MEM->tx_head) >> 16);
500
501
502 /* tell the lance the address of its init block */
503 REGA(CSR1) = dvma_vtob(&(MEM->init));
504 REGA(CSR2) = dvma_vtob(&(MEM->init)) >> 16;
505
506#ifdef CONFIG_SUN3X
507 REGA(CSR3) = CSR3_BSWP | CSR3_ACON | CSR3_BCON;
508#else
509 REGA(CSR3) = CSR3_BSWP;
510#endif
511
512}
513
514
515static netdev_tx_t
516lance_start_xmit(struct sk_buff *skb, struct net_device *dev)
517{
518 struct lance_private *lp = netdev_priv(dev);
519 int entry, len;
520 struct lance_tx_head *head;
521 unsigned long flags;
522
523 DPRINTK( 1, ( "%s: transmit start.\n",
524 dev->name));
525
526 /* Transmitter timeout, serious problems. */
527 if (netif_queue_stopped(dev)) {
528 int tickssofar = jiffies - dev_trans_start(dev);
529 if (tickssofar < HZ/5)
530 return NETDEV_TX_BUSY;
531
532 DPRINTK( 1, ( "%s: transmit timed out, status %04x, resetting.\n",
533 dev->name, DREG ));
534 DREG = CSR0_STOP;
535 /*
536 * Always set BSWP after a STOP as STOP puts it back into
537 * little endian mode.
538 */
539 REGA(CSR3) = CSR3_BSWP;
540 dev->stats.tx_errors++;
541
542 if(lance_debug >= 2) {
543 int i;
544 printk("Ring data: old_tx %d new_tx %d%s new_rx %d\n",
545 lp->old_tx, lp->new_tx,
546 lp->tx_full ? " (full)" : "",
547 lp->new_rx );
548 for( i = 0 ; i < RX_RING_SIZE; i++ )
549 printk( "rx #%d: base=%04x blen=%04x mlen=%04x\n",
550 i, MEM->rx_head[i].base,
551 -MEM->rx_head[i].buf_length,
552 MEM->rx_head[i].msg_length);
553 for( i = 0 ; i < TX_RING_SIZE; i++ )
554 printk("tx #%d: base=%04x len=%04x misc=%04x\n",
555 i, MEM->tx_head[i].base,
556 -MEM->tx_head[i].length,
557 MEM->tx_head[i].misc );
558 }
559
560 lance_init_ring(dev);
561 REGA( CSR0 ) = CSR0_INEA | CSR0_INIT | CSR0_STRT;
562
563 netif_start_queue(dev);
564
565 return NETDEV_TX_OK;
566 }
567
568
569 /* Block a timer-based transmit from overlapping. This could better be
570 done with atomic_swap(1, dev->tbusy), but set_bit() works as well. */
571
572 /* Block a timer-based transmit from overlapping with us by
573 stopping the queue for a bit... */
574
575 netif_stop_queue(dev);
576
577 if (test_and_set_bit( 0, (void*)&lp->lock ) != 0) {
578 printk( "%s: tx queue lock!.\n", dev->name);
579 /* don't clear dev->tbusy flag. */
580 return NETDEV_TX_BUSY;
581 }
582
583 AREG = CSR0;
584 DPRINTK( 2, ( "%s: lance_start_xmit() called, csr0 %4.4x.\n",
585 dev->name, DREG ));
586
587#ifdef CONFIG_SUN3X
588 /* this weirdness doesn't appear on sun3... */
589 if(!(DREG & CSR0_INIT)) {
590 DPRINTK( 1, ("INIT not set, reinitializing...\n"));
591 REGA( CSR0 ) = CSR0_STOP;
592 lance_init_ring(dev);
593 REGA( CSR0 ) = CSR0_INIT | CSR0_STRT;
594 }
595#endif
596
597 /* Fill in a Tx ring entry */
598#if 0
599 if (lance_debug >= 2) {
600 printk( "%s: TX pkt %d type 0x%04x"
601 " from %s to %s"
602 " data at 0x%08x len %d\n",
603 dev->name, lp->new_tx, ((u_short *)skb->data)[6],
604 DEV_ADDR(&skb->data[6]), DEV_ADDR(skb->data),
605 (int)skb->data, (int)skb->len );
606 }
607#endif
608 /* We're not prepared for the int until the last flags are set/reset.
609 * And the int may happen already after setting the OWN_CHIP... */
610 local_irq_save(flags);
611
612 /* Mask to ring buffer boundary. */
613 entry = lp->new_tx;
614 head = &(MEM->tx_head[entry]);
615
616 /* Caution: the write order is important here, set the "ownership" bits
617 * last.
618 */
619
620 /* the sun3's lance needs it's buffer padded to the minimum
621 size */
622 len = (ETH_ZLEN < skb->len) ? skb->len : ETH_ZLEN;
623
624// head->length = -len;
625 head->length = (-len) | 0xf000;
626 head->misc = 0;
627
628 skb_copy_from_linear_data(skb, PKTBUF_ADDR(head), skb->len);
629 if (len != skb->len)
630 memset(PKTBUF_ADDR(head) + skb->len, 0, len-skb->len);
631
632 head->flag = TMD1_OWN_CHIP | TMD1_ENP | TMD1_STP;
633 lp->new_tx = (lp->new_tx + 1) & TX_RING_MOD_MASK;
634 dev->stats.tx_bytes += skb->len;
635
636 /* Trigger an immediate send poll. */
637 REGA(CSR0) = CSR0_INEA | CSR0_TDMD | CSR0_STRT;
638 AREG = CSR0;
639 DPRINTK( 2, ( "%s: lance_start_xmit() exiting, csr0 %4.4x.\n",
640 dev->name, DREG ));
641 dev_kfree_skb(skb);
642
643 lp->lock = 0;
644 if ((MEM->tx_head[(entry+1) & TX_RING_MOD_MASK].flag & TMD1_OWN) ==
645 TMD1_OWN_HOST)
646 netif_start_queue(dev);
647
648 local_irq_restore(flags);
649
650 return NETDEV_TX_OK;
651}
652
653/* The LANCE interrupt handler. */
654
655static irqreturn_t lance_interrupt( int irq, void *dev_id)
656{
657 struct net_device *dev = dev_id;
658 struct lance_private *lp = netdev_priv(dev);
659 int csr0;
660 static int in_interrupt;
661
662 if (dev == NULL) {
663 DPRINTK( 1, ( "lance_interrupt(): invalid dev_id\n" ));
664 return IRQ_NONE;
665 }
666
667 if (in_interrupt)
668 DPRINTK( 2, ( "%s: Re-entering the interrupt handler.\n", dev->name ));
669 in_interrupt = 1;
670
671 still_more:
672 flush_cache_all();
673
674 AREG = CSR0;
675 csr0 = DREG;
676
677 /* ack interrupts */
678 DREG = csr0 & (CSR0_TINT | CSR0_RINT | CSR0_IDON);
679
680 /* clear errors */
681 if(csr0 & CSR0_ERR)
682 DREG = CSR0_BABL | CSR0_MERR | CSR0_CERR | CSR0_MISS;
683
684
685 DPRINTK( 2, ( "%s: interrupt csr0=%04x new csr=%04x.\n",
686 dev->name, csr0, DREG ));
687
688 if (csr0 & CSR0_TINT) { /* Tx-done interrupt */
689 int old_tx = lp->old_tx;
690
691// if(lance_debug >= 3) {
692// int i;
693//
694// printk("%s: tx int\n", dev->name);
695//
696// for(i = 0; i < TX_RING_SIZE; i++)
697// printk("ring %d flag=%04x\n", i,
698// MEM->tx_head[i].flag);
699// }
700
701 while( old_tx != lp->new_tx) {
702 struct lance_tx_head *head = &(MEM->tx_head[old_tx]);
703
704 DPRINTK(3, ("on tx_ring %d\n", old_tx));
705
706 if (head->flag & TMD1_OWN_CHIP)
707 break; /* It still hasn't been Txed */
708
709 if (head->flag & TMD1_ERR) {
710 int status = head->misc;
711 dev->stats.tx_errors++;
712 if (status & TMD3_RTRY) dev->stats.tx_aborted_errors++;
713 if (status & TMD3_LCAR) dev->stats.tx_carrier_errors++;
714 if (status & TMD3_LCOL) dev->stats.tx_window_errors++;
715 if (status & (TMD3_UFLO | TMD3_BUFF)) {
716 dev->stats.tx_fifo_errors++;
717 printk("%s: Tx FIFO error\n",
718 dev->name);
719 REGA(CSR0) = CSR0_STOP;
720 REGA(CSR3) = CSR3_BSWP;
721 lance_init_ring(dev);
722 REGA(CSR0) = CSR0_STRT | CSR0_INEA;
723 return IRQ_HANDLED;
724 }
725 } else if(head->flag & (TMD1_ENP | TMD1_STP)) {
726
727 head->flag &= ~(TMD1_ENP | TMD1_STP);
728 if(head->flag & (TMD1_ONE | TMD1_MORE))
729 dev->stats.collisions++;
730
731 dev->stats.tx_packets++;
732 DPRINTK(3, ("cleared tx ring %d\n", old_tx));
733 }
734 old_tx = (old_tx +1) & TX_RING_MOD_MASK;
735 }
736
737 lp->old_tx = old_tx;
738 }
739
740
741 if (netif_queue_stopped(dev)) {
742 /* The ring is no longer full, clear tbusy. */
743 netif_start_queue(dev);
744 netif_wake_queue(dev);
745 }
746
747 if (csr0 & CSR0_RINT) /* Rx interrupt */
748 lance_rx( dev );
749
750 /* Log misc errors. */
751 if (csr0 & CSR0_BABL) dev->stats.tx_errors++; /* Tx babble. */
752 if (csr0 & CSR0_MISS) dev->stats.rx_errors++; /* Missed a Rx frame. */
753 if (csr0 & CSR0_MERR) {
754 DPRINTK( 1, ( "%s: Bus master arbitration failure (?!?), "
755 "status %04x.\n", dev->name, csr0 ));
756 /* Restart the chip. */
757 REGA(CSR0) = CSR0_STOP;
758 REGA(CSR3) = CSR3_BSWP;
759 lance_init_ring(dev);
760 REGA(CSR0) = CSR0_STRT | CSR0_INEA;
761 }
762
763
764 /* Clear any other interrupt, and set interrupt enable. */
765// DREG = CSR0_BABL | CSR0_CERR | CSR0_MISS | CSR0_MERR |
766// CSR0_IDON | CSR0_INEA;
767
768 REGA(CSR0) = CSR0_INEA;
769
770 if(DREG & (CSR0_RINT | CSR0_TINT)) {
771 DPRINTK(2, ("restarting interrupt, csr0=%#04x\n", DREG));
772 goto still_more;
773 }
774
775 DPRINTK( 2, ( "%s: exiting interrupt, csr0=%#04x.\n",
776 dev->name, DREG ));
777 in_interrupt = 0;
778 return IRQ_HANDLED;
779}
780
781/* get packet, toss into skbuff */
782static int lance_rx( struct net_device *dev )
783{
784 struct lance_private *lp = netdev_priv(dev);
785 int entry = lp->new_rx;
786
787 /* If we own the next entry, it's a new packet. Send it up. */
788 while( (MEM->rx_head[entry].flag & RMD1_OWN) == RMD1_OWN_HOST ) {
789 struct lance_rx_head *head = &(MEM->rx_head[entry]);
790 int status = head->flag;
791
792 if (status != (RMD1_ENP|RMD1_STP)) { /* There was an error. */
793 /* There is a tricky error noted by John Murphy,
794 <murf@perftech.com> to Russ Nelson: Even with
795 full-sized buffers it's possible for a jabber packet to use two
796 buffers, with only the last correctly noting the error. */
797 if (status & RMD1_ENP) /* Only count a general error at the */
798 dev->stats.rx_errors++; /* end of a packet.*/
799 if (status & RMD1_FRAM) dev->stats.rx_frame_errors++;
800 if (status & RMD1_OFLO) dev->stats.rx_over_errors++;
801 if (status & RMD1_CRC) dev->stats.rx_crc_errors++;
802 if (status & RMD1_BUFF) dev->stats.rx_fifo_errors++;
803 head->flag &= (RMD1_ENP|RMD1_STP);
804 } else {
805 /* Malloc up new buffer, compatible with net-3. */
806// short pkt_len = head->msg_length;// & 0xfff;
807 short pkt_len = (head->msg_length & 0xfff) - 4;
808 struct sk_buff *skb;
809
810 if (pkt_len < 60) {
811 printk( "%s: Runt packet!\n", dev->name );
812 dev->stats.rx_errors++;
813 }
814 else {
815 skb = netdev_alloc_skb(dev, pkt_len + 2);
816 if (skb == NULL) {
817 dev->stats.rx_dropped++;
818 head->msg_length = 0;
819 head->flag |= RMD1_OWN_CHIP;
820 lp->new_rx = (lp->new_rx+1) &
821 RX_RING_MOD_MASK;
822 }
823
824#if 0
825 if (lance_debug >= 3) {
826 u_char *data = PKTBUF_ADDR(head);
827 printk("%s: RX pkt %d type 0x%04x"
828 " from %pM to %pM",
829 dev->name, lp->new_tx, ((u_short *)data)[6],
830 &data[6], data);
831
832 printk(" data %02x %02x %02x %02x %02x %02x %02x %02x "
833 "len %d at %08x\n",
834 data[15], data[16], data[17], data[18],
835 data[19], data[20], data[21], data[22],
836 pkt_len, data);
837 }
838#endif
839 if (lance_debug >= 3) {
840 u_char *data = PKTBUF_ADDR(head);
841 printk( "%s: RX pkt %d type 0x%04x len %d\n ", dev->name, entry, ((u_short *)data)[6], pkt_len);
842 }
843
844
845 skb_reserve( skb, 2 ); /* 16 byte align */
846 skb_put( skb, pkt_len ); /* Make room */
847 skb_copy_to_linear_data(skb,
848 PKTBUF_ADDR(head),
849 pkt_len);
850
851 skb->protocol = eth_type_trans( skb, dev );
852 netif_rx( skb );
853 dev->stats.rx_packets++;
854 dev->stats.rx_bytes += pkt_len;
855 }
856 }
857
858// head->buf_length = -PKT_BUF_SZ | 0xf000;
859 head->msg_length = 0;
860 head->flag = RMD1_OWN_CHIP;
861
862 entry = lp->new_rx = (lp->new_rx +1) & RX_RING_MOD_MASK;
863 }
864
865 /* From lance.c (Donald Becker): */
866 /* We should check that at least two ring entries are free.
867 If not, we should free one and mark stats->rx_dropped++. */
868
869 return 0;
870}
871
872
873static int lance_close( struct net_device *dev )
874{
875 struct lance_private *lp = netdev_priv(dev);
876
877 netif_stop_queue(dev);
878
879 AREG = CSR0;
880
881 DPRINTK( 2, ( "%s: Shutting down ethercard, status was %2.2x.\n",
882 dev->name, DREG ));
883
884 /* We stop the LANCE here -- it occasionally polls
885 memory if we don't. */
886 DREG = CSR0_STOP;
887 return 0;
888}
889
890
891/* Set or clear the multicast filter for this adaptor.
892 num_addrs == -1 Promiscuous mode, receive all packets
893 num_addrs == 0 Normal mode, clear multicast list
894 num_addrs > 0 Multicast mode, receive normal and MC packets, and do
895 best-effort filtering.
896 */
897
898/* completely untested on a sun3 */
899static void set_multicast_list( struct net_device *dev )
900{
901 struct lance_private *lp = netdev_priv(dev);
902
903 if(netif_queue_stopped(dev))
904 /* Only possible if board is already started */
905 return;
906
907 /* We take the simple way out and always enable promiscuous mode. */
908 DREG = CSR0_STOP; /* Temporarily stop the lance. */
909
910 if (dev->flags & IFF_PROMISC) {
911 /* Log any net taps. */
912 DPRINTK( 3, ( "%s: Promiscuous mode enabled.\n", dev->name ));
913 REGA( CSR15 ) = 0x8000; /* Set promiscuous mode */
914 } else {
915 short multicast_table[4];
916 int num_addrs = netdev_mc_count(dev);
917 int i;
918 /* We don't use the multicast table, but rely on upper-layer
919 * filtering. */
920 memset( multicast_table, (num_addrs == 0) ? 0 : -1,
921 sizeof(multicast_table) );
922 for( i = 0; i < 4; i++ )
923 REGA( CSR8+i ) = multicast_table[i];
924 REGA( CSR15 ) = 0; /* Unset promiscuous mode */
925 }
926
927 /*
928 * Always set BSWP after a STOP as STOP puts it back into
929 * little endian mode.
930 */
931 REGA( CSR3 ) = CSR3_BSWP;
932
933 /* Resume normal operation and reset AREG to CSR0 */
934 REGA( CSR0 ) = CSR0_IDON | CSR0_INEA | CSR0_STRT;
935}
936
937
938#ifdef MODULE
939
940static struct net_device *sun3lance_dev;
941
942int __init init_module(void)
943{
944 sun3lance_dev = sun3lance_probe(-1);
945 return PTR_ERR_OR_ZERO(sun3lance_dev);
946}
947
948void __exit cleanup_module(void)
949{
950 unregister_netdev(sun3lance_dev);
951#ifdef CONFIG_SUN3
952 iounmap((void __iomem *)sun3lance_dev->base_addr);
953#endif
954 free_netdev(sun3lance_dev);
955}
956
957#endif /* MODULE */
958