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[linux-2.6/kvm.git] / drivers / net / sun3lance.c
blob7d9ec23aabf6b22be99a01d2d7526d5e6cc23cda
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_multicast_list = 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, IRQF_DISABLED, "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 = dev_alloc_skb( pkt_len+2 );
814 if (skb == NULL) {
815 DPRINTK( 1, ( "%s: Memory squeeze, deferring packet.\n",
816 dev->name ));
817
818 dev->stats.rx_dropped++;
819 head->msg_length = 0;
820 head->flag |= RMD1_OWN_CHIP;
821 lp->new_rx = (lp->new_rx+1) &
822 RX_RING_MOD_MASK;
823 }
824
825 #if 0
826 if (lance_debug >= 3) {
827 u_char *data = PKTBUF_ADDR(head);
828 printk("%s: RX pkt %d type 0x%04x"
829 " from %pM to %pM",
830 dev->name, lp->new_tx, ((u_short *)data)[6],
831 &data[6], data);
832
833 printk(" data %02x %02x %02x %02x %02x %02x %02x %02x "
834 "len %d at %08x\n",
835 data[15], data[16], data[17], data[18],
836 data[19], data[20], data[21], data[22],
837 pkt_len, data);
838 }
839 #endif
840 if (lance_debug >= 3) {
841 u_char *data = PKTBUF_ADDR(head);
842 printk( "%s: RX pkt %d type 0x%04x len %d\n ", dev->name, entry, ((u_short *)data)[6], pkt_len);
843 }
844
845
846 skb_reserve( skb, 2 ); /* 16 byte align */
847 skb_put( skb, pkt_len ); /* Make room */
848 skb_copy_to_linear_data(skb,
849 PKTBUF_ADDR(head),
850 pkt_len);
851
852 skb->protocol = eth_type_trans( skb, dev );
853 netif_rx( skb );
854 dev->stats.rx_packets++;
855 dev->stats.rx_bytes += pkt_len;
856 }
857 }
858
859 // head->buf_length = -PKT_BUF_SZ | 0xf000;
860 head->msg_length = 0;
861 head->flag = RMD1_OWN_CHIP;
862
863 entry = lp->new_rx = (lp->new_rx +1) & RX_RING_MOD_MASK;
864 }
865
866 /* From lance.c (Donald Becker): */
867 /* We should check that at least two ring entries are free.
868 If not, we should free one and mark stats->rx_dropped++. */
869
870 return 0;
871 }
872
873
874 static int lance_close( struct net_device *dev )
875 {
876 struct lance_private *lp = netdev_priv(dev);
877
878 netif_stop_queue(dev);
879
880 AREG = CSR0;
881
882 DPRINTK( 2, ( "%s: Shutting down ethercard, status was %2.2x.\n",
883 dev->name, DREG ));
884
885 /* We stop the LANCE here -- it occasionally polls
886 memory if we don't. */
887 DREG = CSR0_STOP;
888 return 0;
889 }
890
891
892 /* Set or clear the multicast filter for this adaptor.
893 num_addrs == -1 Promiscuous mode, receive all packets
894 num_addrs == 0 Normal mode, clear multicast list
895 num_addrs > 0 Multicast mode, receive normal and MC packets, and do
896 best-effort filtering.
897 */
898
899 /* completely untested on a sun3 */
900 static void set_multicast_list( struct net_device *dev )
901 {
902 struct lance_private *lp = netdev_priv(dev);
903
904 if(netif_queue_stopped(dev))
905 /* Only possible if board is already started */
906 return;
907
908 /* We take the simple way out and always enable promiscuous mode. */
909 DREG = CSR0_STOP; /* Temporarily stop the lance. */
910
911 if (dev->flags & IFF_PROMISC) {
912 /* Log any net taps. */
913 DPRINTK( 3, ( "%s: Promiscuous mode enabled.\n", dev->name ));
914 REGA( CSR15 ) = 0x8000; /* Set promiscuous mode */
915 } else {
916 short multicast_table[4];
917 int num_addrs = netdev_mc_count(dev);
918 int i;
919 /* We don't use the multicast table, but rely on upper-layer
920 * filtering. */
921 memset( multicast_table, (num_addrs == 0) ? 0 : -1,
922 sizeof(multicast_table) );
923 for( i = 0; i < 4; i++ )
924 REGA( CSR8+i ) = multicast_table[i];
925 REGA( CSR15 ) = 0; /* Unset promiscuous mode */
926 }
927
928 /*
929 * Always set BSWP after a STOP as STOP puts it back into
930 * little endian mode.
931 */
932 REGA( CSR3 ) = CSR3_BSWP;
933
934 /* Resume normal operation and reset AREG to CSR0 */
935 REGA( CSR0 ) = CSR0_IDON | CSR0_INEA | CSR0_STRT;
936 }
937
938
939 #ifdef MODULE
940
941 static struct net_device *sun3lance_dev;
942
943 int __init init_module(void)
944 {
945 sun3lance_dev = sun3lance_probe(-1);
946 if (IS_ERR(sun3lance_dev))
947 return PTR_ERR(sun3lance_dev);
948 return 0;
949 }
950
951 void __exit cleanup_module(void)
952 {
953 unregister_netdev(sun3lance_dev);
954 #ifdef CONFIG_SUN3
955 iounmap((void __iomem *)sun3lance_dev->base_addr);
956 #endif
957 free_netdev(sun3lance_dev);
958 }
959
960 #endif /* MODULE */
961
kernel-based virtual machine