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[TG3]: Set minimal hw interrupt mitigation.
[linux-2.6/verdex.git] / drivers / net / atarilance.c
blobad011214c7f2a0ffc19029642aacda83e3065e6a
1 /* atarilance.c: Ethernet driver for VME Lance cards on the Atari */
2 /*
3 Written 1995/96 by Roman Hodek (Roman.Hodek@informatik.uni-erlangen.de)
4
5 This software may be used and distributed according to the terms
6 of the GNU General Public License, incorporated herein by reference.
7
8 This drivers was written with the following sources of reference:
9 - The driver for the Riebl Lance card by the TU Vienna.
10 - The modified TUW driver for PAM's VME cards
11 - The PC-Linux driver for Lance cards (but this is for bus master
12 cards, not the shared memory ones)
13 - The Amiga Ariadne driver
14
15 v1.0: (in 1.2.13pl4/0.9.13)
16 Initial version
17 v1.1: (in 1.2.13pl5)
18 more comments
19 deleted some debugging stuff
20 optimized register access (keep AREG pointing to CSR0)
21 following AMD, CSR0_STRT should be set only after IDON is detected
22 use memcpy() for data transfers, that also employs long word moves
23 better probe procedure for 24-bit systems
24 non-VME-RieblCards need extra delays in memcpy
25 must also do write test, since 0xfxe00000 may hit ROM
26 use 8/32 tx/rx buffers, which should give better NFS performance;
27 this is made possible by shifting the last packet buffer after the
28 RieblCard reserved area
29 v1.2: (in 1.2.13pl8)
30 again fixed probing for the Falcon; 0xfe01000 hits phys. 0x00010000
31 and thus RAM, in case of no Lance found all memory contents have to
32 be restored!
33 Now possible to compile as module.
34 v1.3: 03/30/96 Jes Sorensen, Roman (in 1.3)
35 Several little 1.3 adaptions
36 When the lance is stopped it jumps back into little-endian
37 mode. It is therefore necessary to put it back where it
38 belongs, in big endian mode, in order to make things work.
39 This might be the reason why multicast-mode didn't work
40 before, but I'm not able to test it as I only got an Amiga
41 (we had similar problems with the A2065 driver).
42
43 */
44
45 static char version[] = "atarilance.c: v1.3 04/04/96 "
46 "Roman.Hodek@informatik.uni-erlangen.de\n";
47
48 #include <linux/netdevice.h>
49 #include <linux/etherdevice.h>
50 #include <linux/module.h>
51 #include <linux/stddef.h>
52 #include <linux/kernel.h>
53 #include <linux/string.h>
54 #include <linux/errno.h>
55 #include <linux/skbuff.h>
56 #include <linux/slab.h>
57 #include <linux/interrupt.h>
58 #include <linux/init.h>
59 #include <linux/bitops.h>
60
61 #include <asm/setup.h>
62 #include <asm/irq.h>
63 #include <asm/atarihw.h>
64 #include <asm/atariints.h>
65 #include <asm/io.h>
66
67 /* Debug level:
68 * 0 = silent, print only serious errors
69 * 1 = normal, print error messages
70 * 2 = debug, print debug infos
71 * 3 = debug, print even more debug infos (packet data)
72 */
73
74 #define LANCE_DEBUG 1
75
76 #ifdef LANCE_DEBUG
77 static int lance_debug = LANCE_DEBUG;
78 #else
79 static int lance_debug = 1;
80 #endif
81 MODULE_PARM(lance_debug, "i");
82 MODULE_PARM_DESC(lance_debug, "atarilance debug level (0-3)");
83 MODULE_LICENSE("GPL");
84
85 /* Print debug messages on probing? */
86 #undef LANCE_DEBUG_PROBE
87
88 #define DPRINTK(n,a) \
89 do { \
90 if (lance_debug >= n) \
91 printk a; \
92 } while( 0 )
93
94 #ifdef LANCE_DEBUG_PROBE
95 # define PROBE_PRINT(a) printk a
96 #else
97 # define PROBE_PRINT(a)
98 #endif
99
100 /* These define the number of Rx and Tx buffers as log2. (Only powers
101 * of two are valid)
102 * Much more rx buffers (32) are reserved than tx buffers (8), since receiving
103 * is more time critical then sending and packets may have to remain in the
104 * board's memory when main memory is low.
105 */
106
107 #define TX_LOG_RING_SIZE 3
108 #define RX_LOG_RING_SIZE 5
109
110 /* These are the derived values */
111
112 #define TX_RING_SIZE (1 << TX_LOG_RING_SIZE)
113 #define TX_RING_LEN_BITS (TX_LOG_RING_SIZE << 5)
114 #define TX_RING_MOD_MASK (TX_RING_SIZE - 1)
115
116 #define RX_RING_SIZE (1 << RX_LOG_RING_SIZE)
117 #define RX_RING_LEN_BITS (RX_LOG_RING_SIZE << 5)
118 #define RX_RING_MOD_MASK (RX_RING_SIZE - 1)
119
120 #define TX_TIMEOUT 20
121
122 /* The LANCE Rx and Tx ring descriptors. */
123 struct lance_rx_head {
124 unsigned short base; /* Low word of base addr */
125 volatile unsigned char flag;
126 unsigned char base_hi; /* High word of base addr (unused) */
127 short buf_length; /* This length is 2s complement! */
128 volatile short msg_length; /* This length is "normal". */
129 };
130
131 struct lance_tx_head {
132 unsigned short base; /* Low word of base addr */
133 volatile unsigned char flag;
134 unsigned char base_hi; /* High word of base addr (unused) */
135 short length; /* Length is 2s complement! */
136 volatile short misc;
137 };
138
139 struct ringdesc {
140 unsigned short adr_lo; /* Low 16 bits of address */
141 unsigned char len; /* Length bits */
142 unsigned char adr_hi; /* High 8 bits of address (unused) */
143 };
144
145 /* The LANCE initialization block, described in databook. */
146 struct lance_init_block {
147 unsigned short mode; /* Pre-set mode */
148 unsigned char hwaddr[6]; /* Physical ethernet address */
149 unsigned filter[2]; /* Multicast filter (unused). */
150 /* Receive and transmit ring base, along with length bits. */
151 struct ringdesc rx_ring;
152 struct ringdesc tx_ring;
153 };
154
155 /* The whole layout of the Lance shared memory */
156 struct lance_memory {
157 struct lance_init_block init;
158 struct lance_tx_head tx_head[TX_RING_SIZE];
159 struct lance_rx_head rx_head[RX_RING_SIZE];
160 char packet_area[0]; /* packet data follow after the
161 * init block and the ring
162 * descriptors and are located
163 * at runtime */
164 };
165
166 /* RieblCard specifics:
167 * The original TOS driver for these cards reserves the area from offset
168 * 0xee70 to 0xeebb for storing configuration data. Of interest to us is the
169 * Ethernet address there, and the magic for verifying the data's validity.
170 * The reserved area isn't touch by packet buffers. Furthermore, offset 0xfffe
171 * is reserved for the interrupt vector number.
172 */
173 #define RIEBL_RSVD_START 0xee70
174 #define RIEBL_RSVD_END 0xeec0
175 #define RIEBL_MAGIC 0x09051990
176 #define RIEBL_MAGIC_ADDR ((unsigned long *)(((char *)MEM) + 0xee8a))
177 #define RIEBL_HWADDR_ADDR ((unsigned char *)(((char *)MEM) + 0xee8e))
178 #define RIEBL_IVEC_ADDR ((unsigned short *)(((char *)MEM) + 0xfffe))
179
180 /* This is a default address for the old RieblCards without a battery
181 * that have no ethernet address at boot time. 00:00:36:04 is the
182 * prefix for Riebl cards, the 00:00 at the end is arbitrary.
183 */
184
185 static unsigned char OldRieblDefHwaddr[6] = {
186 0x00, 0x00, 0x36, 0x04, 0x00, 0x00
187 };
188
189
190 /* I/O registers of the Lance chip */
191
192 struct lance_ioreg {
193 /* base+0x0 */ volatile unsigned short data;
194 /* base+0x2 */ volatile unsigned short addr;
195 unsigned char _dummy1[3];
196 /* base+0x7 */ volatile unsigned char ivec;
197 unsigned char _dummy2[5];
198 /* base+0xd */ volatile unsigned char eeprom;
199 unsigned char _dummy3;
200 /* base+0xf */ volatile unsigned char mem;
201 };
202
203 /* Types of boards this driver supports */
204
205 enum lance_type {
206 OLD_RIEBL, /* old Riebl card without battery */
207 NEW_RIEBL, /* new Riebl card with battery */
208 PAM_CARD /* PAM card with EEPROM */
209 };
210
211 static char *lance_names[] = {
212 "Riebl-Card (without battery)",
213 "Riebl-Card (with battery)",
214 "PAM intern card"
215 };
216
217 /* The driver's private device structure */
218
219 struct lance_private {
220 enum lance_type cardtype;
221 struct lance_ioreg *iobase;
222 struct lance_memory *mem;
223 int cur_rx, cur_tx; /* The next free ring entry */
224 int dirty_tx; /* Ring entries to be freed. */
225 /* copy function */
226 void *(*memcpy_f)( void *, const void *, size_t );
227 struct net_device_stats stats;
228 /* This must be long for set_bit() */
229 long tx_full;
230 spinlock_t devlock;
231 };
232
233 /* I/O register access macros */
234
235 #define MEM lp->mem
236 #define DREG IO->data
237 #define AREG IO->addr
238 #define REGA(a) ( AREG = (a), DREG )
239
240 /* Definitions for packet buffer access: */
241 #define PKT_BUF_SZ 1544
242 /* Get the address of a packet buffer corresponding to a given buffer head */
243 #define PKTBUF_ADDR(head) (((unsigned char *)(MEM)) + (head)->base)
244
245 /* Possible memory/IO addresses for probing */
246
247 struct lance_addr {
248 unsigned long memaddr;
249 unsigned long ioaddr;
250 int slow_flag;
251 } lance_addr_list[] = {
252 { 0xfe010000, 0xfe00fff0, 0 }, /* RieblCard VME in TT */
253 { 0xffc10000, 0xffc0fff0, 0 }, /* RieblCard VME in MegaSTE
254 (highest byte stripped) */
255 { 0xffe00000, 0xffff7000, 1 }, /* RieblCard in ST
256 (highest byte stripped) */
257 { 0xffd00000, 0xffff7000, 1 }, /* RieblCard in ST with hw modif. to
258 avoid conflict with ROM
259 (highest byte stripped) */
260 { 0xffcf0000, 0xffcffff0, 0 }, /* PAMCard VME in TT and MSTE
261 (highest byte stripped) */
262 { 0xfecf0000, 0xfecffff0, 0 }, /* Rhotron's PAMCard VME in TT and MSTE
263 (highest byte stripped) */
264 };
265
266 #define N_LANCE_ADDR (sizeof(lance_addr_list)/sizeof(*lance_addr_list))
267
268
269 /* Definitions for the Lance */
270
271 /* tx_head flags */
272 #define TMD1_ENP 0x01 /* end of packet */
273 #define TMD1_STP 0x02 /* start of packet */
274 #define TMD1_DEF 0x04 /* deferred */
275 #define TMD1_ONE 0x08 /* one retry needed */
276 #define TMD1_MORE 0x10 /* more than one retry needed */
277 #define TMD1_ERR 0x40 /* error summary */
278 #define TMD1_OWN 0x80 /* ownership (set: chip owns) */
279
280 #define TMD1_OWN_CHIP TMD1_OWN
281 #define TMD1_OWN_HOST 0
282
283 /* tx_head misc field */
284 #define TMD3_TDR 0x03FF /* Time Domain Reflectometry counter */
285 #define TMD3_RTRY 0x0400 /* failed after 16 retries */
286 #define TMD3_LCAR 0x0800 /* carrier lost */
287 #define TMD3_LCOL 0x1000 /* late collision */
288 #define TMD3_UFLO 0x4000 /* underflow (late memory) */
289 #define TMD3_BUFF 0x8000 /* buffering error (no ENP) */
290
291 /* rx_head flags */
292 #define RMD1_ENP 0x01 /* end of packet */
293 #define RMD1_STP 0x02 /* start of packet */
294 #define RMD1_BUFF 0x04 /* buffer error */
295 #define RMD1_CRC 0x08 /* CRC error */
296 #define RMD1_OFLO 0x10 /* overflow */
297 #define RMD1_FRAM 0x20 /* framing error */
298 #define RMD1_ERR 0x40 /* error summary */
299 #define RMD1_OWN 0x80 /* ownership (set: ship owns) */
300
301 #define RMD1_OWN_CHIP RMD1_OWN
302 #define RMD1_OWN_HOST 0
303
304 /* register names */
305 #define CSR0 0 /* mode/status */
306 #define CSR1 1 /* init block addr (low) */
307 #define CSR2 2 /* init block addr (high) */
308 #define CSR3 3 /* misc */
309 #define CSR8 8 /* address filter */
310 #define CSR15 15 /* promiscuous mode */
311
312 /* CSR0 */
313 /* (R=readable, W=writeable, S=set on write, C=clear on write) */
314 #define CSR0_INIT 0x0001 /* initialize (RS) */
315 #define CSR0_STRT 0x0002 /* start (RS) */
316 #define CSR0_STOP 0x0004 /* stop (RS) */
317 #define CSR0_TDMD 0x0008 /* transmit demand (RS) */
318 #define CSR0_TXON 0x0010 /* transmitter on (R) */
319 #define CSR0_RXON 0x0020 /* receiver on (R) */
320 #define CSR0_INEA 0x0040 /* interrupt enable (RW) */
321 #define CSR0_INTR 0x0080 /* interrupt active (R) */
322 #define CSR0_IDON 0x0100 /* initialization done (RC) */
323 #define CSR0_TINT 0x0200 /* transmitter interrupt (RC) */
324 #define CSR0_RINT 0x0400 /* receiver interrupt (RC) */
325 #define CSR0_MERR 0x0800 /* memory error (RC) */
326 #define CSR0_MISS 0x1000 /* missed frame (RC) */
327 #define CSR0_CERR 0x2000 /* carrier error (no heartbeat :-) (RC) */
328 #define CSR0_BABL 0x4000 /* babble: tx-ed too many bits (RC) */
329 #define CSR0_ERR 0x8000 /* error (RC) */
330
331 /* CSR3 */
332 #define CSR3_BCON 0x0001 /* byte control */
333 #define CSR3_ACON 0x0002 /* ALE control */
334 #define CSR3_BSWP 0x0004 /* byte swap (1=big endian) */
335
336
337
338 /***************************** Prototypes *****************************/
339
340 static int addr_accessible( volatile void *regp, int wordflag, int
341 writeflag );
342 static unsigned long lance_probe1( struct net_device *dev, struct lance_addr
343 *init_rec );
344 static int lance_open( struct net_device *dev );
345 static void lance_init_ring( struct net_device *dev );
346 static int lance_start_xmit( struct sk_buff *skb, struct net_device *dev );
347 static irqreturn_t lance_interrupt( int irq, void *dev_id, struct pt_regs *fp );
348 static int lance_rx( struct net_device *dev );
349 static int lance_close( struct net_device *dev );
350 static struct net_device_stats *lance_get_stats( struct net_device *dev );
351 static void set_multicast_list( struct net_device *dev );
352 static int lance_set_mac_address( struct net_device *dev, void *addr );
353 static void lance_tx_timeout (struct net_device *dev);
354
355 /************************* End of Prototypes **************************/
356
357
358
359 \f
360
361 static void *slow_memcpy( void *dst, const void *src, size_t len )
362
363 { char *cto = dst;
364 const char *cfrom = src;
365
366 while( len-- ) {
367 *cto++ = *cfrom++;
368 MFPDELAY();
369 }
370 return( dst );
371 }
372
373
374 struct net_device * __init atarilance_probe(int unit)
375 {
376 int i;
377 static int found;
378 struct net_device *dev;
379 int err = -ENODEV;
380
381 if (!MACH_IS_ATARI || found)
382 /* Assume there's only one board possible... That seems true, since
383 * the Riebl/PAM board's address cannot be changed. */
384 return ERR_PTR(-ENODEV);
385
386 dev = alloc_etherdev(sizeof(struct lance_private));
387 if (!dev)
388 return ERR_PTR(-ENOMEM);
389 if (unit >= 0) {
390 sprintf(dev->name, "eth%d", unit);
391 netdev_boot_setup_check(dev);
392 }
393 SET_MODULE_OWNER(dev);
394
395 for( i = 0; i < N_LANCE_ADDR; ++i ) {
396 if (lance_probe1( dev, &lance_addr_list[i] )) {
397 found = 1;
398 err = register_netdev(dev);
399 if (!err)
400 return dev;
401 free_irq(dev->irq, dev);
402 break;
403 }
404 }
405 free_netdev(dev);
406 return ERR_PTR(err);
407 }
408
409
410 /* Derived from hwreg_present() in atari/config.c: */
411
412 static int __init addr_accessible( volatile void *regp, int wordflag, int writeflag )
413 {
414 int ret;
415 long flags;
416 long *vbr, save_berr;
417
418 local_irq_save(flags);
419
420 __asm__ __volatile__ ( "movec %/vbr,%0" : "=r" (vbr) : );
421 save_berr = vbr[2];
422
423 __asm__ __volatile__
424 ( "movel %/sp,%/d1\n\t"
425 "movel #Lberr,%2@\n\t"
426 "moveq #0,%0\n\t"
427 "tstl %3\n\t"
428 "bne 1f\n\t"
429 "moveb %1@,%/d0\n\t"
430 "nop \n\t"
431 "bra 2f\n"
432 "1: movew %1@,%/d0\n\t"
433 "nop \n"
434 "2: tstl %4\n\t"
435 "beq 2f\n\t"
436 "tstl %3\n\t"
437 "bne 1f\n\t"
438 "clrb %1@\n\t"
439 "nop \n\t"
440 "moveb %/d0,%1@\n\t"
441 "nop \n\t"
442 "bra 2f\n"
443 "1: clrw %1@\n\t"
444 "nop \n\t"
445 "movew %/d0,%1@\n\t"
446 "nop \n"
447 "2: moveq #1,%0\n"
448 "Lberr: movel %/d1,%/sp"
449 : "=&d" (ret)
450 : "a" (regp), "a" (&vbr[2]), "rm" (wordflag), "rm" (writeflag)
451 : "d0", "d1", "memory"
452 );
453
454 vbr[2] = save_berr;
455 local_irq_restore(flags);
456
457 return( ret );
458 }
459
460
461 static unsigned long __init lance_probe1( struct net_device *dev,
462 struct lance_addr *init_rec )
463 {
464 volatile unsigned short *memaddr =
465 (volatile unsigned short *)init_rec->memaddr;
466 volatile unsigned short *ioaddr =
467 (volatile unsigned short *)init_rec->ioaddr;
468 struct lance_private *lp;
469 struct lance_ioreg *IO;
470 int i;
471 static int did_version;
472 unsigned short save1, save2;
473
474 PROBE_PRINT(( "Probing for Lance card at mem %#lx io %#lx\n",
475 (long)memaddr, (long)ioaddr ));
476
477 /* Test whether memory readable and writable */
478 PROBE_PRINT(( "lance_probe1: testing memory to be accessible\n" ));
479 if (!addr_accessible( memaddr, 1, 1 )) goto probe_fail;
480
481 /* Written values should come back... */
482 PROBE_PRINT(( "lance_probe1: testing memory to be writable (1)\n" ));
483 save1 = *memaddr;
484 *memaddr = 0x0001;
485 if (*memaddr != 0x0001) goto probe_fail;
486 PROBE_PRINT(( "lance_probe1: testing memory to be writable (2)\n" ));
487 *memaddr = 0x0000;
488 if (*memaddr != 0x0000) goto probe_fail;
489 *memaddr = save1;
490
491 /* First port should be readable and writable */
492 PROBE_PRINT(( "lance_probe1: testing ioport to be accessible\n" ));
493 if (!addr_accessible( ioaddr, 1, 1 )) goto probe_fail;
494
495 /* and written values should be readable */
496 PROBE_PRINT(( "lance_probe1: testing ioport to be writeable\n" ));
497 save2 = ioaddr[1];
498 ioaddr[1] = 0x0001;
499 if (ioaddr[1] != 0x0001) goto probe_fail;
500
501 /* The CSR0_INIT bit should not be readable */
502 PROBE_PRINT(( "lance_probe1: testing CSR0 register function (1)\n" ));
503 save1 = ioaddr[0];
504 ioaddr[1] = CSR0;
505 ioaddr[0] = CSR0_INIT | CSR0_STOP;
506 if (ioaddr[0] != CSR0_STOP) {
507 ioaddr[0] = save1;
508 ioaddr[1] = save2;
509 goto probe_fail;
510 }
511 PROBE_PRINT(( "lance_probe1: testing CSR0 register function (2)\n" ));
512 ioaddr[0] = CSR0_STOP;
513 if (ioaddr[0] != CSR0_STOP) {
514 ioaddr[0] = save1;
515 ioaddr[1] = save2;
516 goto probe_fail;
517 }
518
519 /* Now ok... */
520 PROBE_PRINT(( "lance_probe1: Lance card detected\n" ));
521 goto probe_ok;
522
523 probe_fail:
524 return( 0 );
525
526 probe_ok:
527 lp = (struct lance_private *)dev->priv;
528 MEM = (struct lance_memory *)memaddr;
529 IO = lp->iobase = (struct lance_ioreg *)ioaddr;
530 dev->base_addr = (unsigned long)ioaddr; /* informational only */
531 lp->memcpy_f = init_rec->slow_flag ? slow_memcpy : memcpy;
532
533 REGA( CSR0 ) = CSR0_STOP;
534
535 /* Now test for type: If the eeprom I/O port is readable, it is a
536 * PAM card */
537 if (addr_accessible( &(IO->eeprom), 0, 0 )) {
538 /* Switch back to Ram */
539 i = IO->mem;
540 lp->cardtype = PAM_CARD;
541 }
542 else if (*RIEBL_MAGIC_ADDR == RIEBL_MAGIC) {
543 lp->cardtype = NEW_RIEBL;
544 }
545 else
546 lp->cardtype = OLD_RIEBL;
547
548 if (lp->cardtype == PAM_CARD ||
549 memaddr == (unsigned short *)0xffe00000) {
550 /* PAMs card and Riebl on ST use level 5 autovector */
551 if (request_irq(IRQ_AUTO_5, lance_interrupt, IRQ_TYPE_PRIO,
552 "PAM/Riebl-ST Ethernet", dev)) {
553 printk( "Lance: request for irq %d failed\n", IRQ_AUTO_5 );
554 return( 0 );
555 }
556 dev->irq = (unsigned short)IRQ_AUTO_5;
557 }
558 else {
559 /* For VME-RieblCards, request a free VME int;
560 * (This must be unsigned long, since dev->irq is short and the
561 * IRQ_MACHSPEC bit would be cut off...)
562 */
563 unsigned long irq = atari_register_vme_int();
564 if (!irq) {
565 printk( "Lance: request for VME interrupt failed\n" );
566 return( 0 );
567 }
568 if (request_irq(irq, lance_interrupt, IRQ_TYPE_PRIO,
569 "Riebl-VME Ethernet", dev)) {
570 printk( "Lance: request for irq %ld failed\n", irq );
571 return( 0 );
572 }
573 dev->irq = irq;
574 }
575
576 printk("%s: %s at io %#lx, mem %#lx, irq %d%s, hwaddr ",
577 dev->name, lance_names[lp->cardtype],
578 (unsigned long)ioaddr,
579 (unsigned long)memaddr,
580 dev->irq,
581 init_rec->slow_flag ? " (slow memcpy)" : "" );
582
583 /* Get the ethernet address */
584 switch( lp->cardtype ) {
585 case OLD_RIEBL:
586 /* No ethernet address! (Set some default address) */
587 memcpy( dev->dev_addr, OldRieblDefHwaddr, 6 );
588 break;
589 case NEW_RIEBL:
590 lp->memcpy_f( dev->dev_addr, RIEBL_HWADDR_ADDR, 6 );
591 break;
592 case PAM_CARD:
593 i = IO->eeprom;
594 for( i = 0; i < 6; ++i )
595 dev->dev_addr[i] =
596 ((((unsigned short *)MEM)[i*2] & 0x0f) << 4) |
597 ((((unsigned short *)MEM)[i*2+1] & 0x0f));
598 i = IO->mem;
599 break;
600 }
601 for( i = 0; i < 6; ++i )
602 printk( "%02x%s", dev->dev_addr[i], (i < 5) ? ":" : "\n" );
603 if (lp->cardtype == OLD_RIEBL) {
604 printk( "%s: Warning: This is a default ethernet address!\n",
605 dev->name );
606 printk( " Use \"ifconfig hw ether ...\" to set the address.\n" );
607 }
608
609 spin_lock_init(&lp->devlock);
610
611 MEM->init.mode = 0x0000; /* Disable Rx and Tx. */
612 for( i = 0; i < 6; i++ )
613 MEM->init.hwaddr[i] = dev->dev_addr[i^1]; /* <- 16 bit swap! */
614 MEM->init.filter[0] = 0x00000000;
615 MEM->init.filter[1] = 0x00000000;
616 MEM->init.rx_ring.adr_lo = offsetof( struct lance_memory, rx_head );
617 MEM->init.rx_ring.adr_hi = 0;
618 MEM->init.rx_ring.len = RX_RING_LEN_BITS;
619 MEM->init.tx_ring.adr_lo = offsetof( struct lance_memory, tx_head );
620 MEM->init.tx_ring.adr_hi = 0;
621 MEM->init.tx_ring.len = TX_RING_LEN_BITS;
622
623 if (lp->cardtype == PAM_CARD)
624 IO->ivec = IRQ_SOURCE_TO_VECTOR(dev->irq);
625 else
626 *RIEBL_IVEC_ADDR = IRQ_SOURCE_TO_VECTOR(dev->irq);
627
628 if (did_version++ == 0)
629 DPRINTK( 1, ( version ));
630
631 /* The LANCE-specific entries in the device structure. */
632 dev->open = &lance_open;
633 dev->hard_start_xmit = &lance_start_xmit;
634 dev->stop = &lance_close;
635 dev->get_stats = &lance_get_stats;
636 dev->set_multicast_list = &set_multicast_list;
637 dev->set_mac_address = &lance_set_mac_address;
638
639 /* XXX MSch */
640 dev->tx_timeout = lance_tx_timeout;
641 dev->watchdog_timeo = TX_TIMEOUT;
642
643
644 #if 0
645 dev->start = 0;
646 #endif
647
648 memset( &lp->stats, 0, sizeof(lp->stats) );
649
650 return( 1 );
651 }
652
653 \f
654 static int lance_open( struct net_device *dev )
655
656 { struct lance_private *lp = (struct lance_private *)dev->priv;
657 struct lance_ioreg *IO = lp->iobase;
658 int i;
659
660 DPRINTK( 2, ( "%s: lance_open()\n", dev->name ));
661
662 lance_init_ring(dev);
663 /* Re-initialize the LANCE, and start it when done. */
664
665 REGA( CSR3 ) = CSR3_BSWP | (lp->cardtype == PAM_CARD ? CSR3_ACON : 0);
666 REGA( CSR2 ) = 0;
667 REGA( CSR1 ) = 0;
668 REGA( CSR0 ) = CSR0_INIT;
669 /* From now on, AREG is kept to point to CSR0 */
670
671 i = 1000000;
672 while (--i > 0)
673 if (DREG & CSR0_IDON)
674 break;
675 if (i < 0 || (DREG & CSR0_ERR)) {
676 DPRINTK( 2, ( "lance_open(): opening %s failed, i=%d, csr0=%04x\n",
677 dev->name, i, DREG ));
678 DREG = CSR0_STOP;
679 return( -EIO );
680 }
681 DREG = CSR0_IDON;
682 DREG = CSR0_STRT;
683 DREG = CSR0_INEA;
684
685 netif_start_queue (dev);
686
687 DPRINTK( 2, ( "%s: LANCE is open, csr0 %04x\n", dev->name, DREG ));
688
689 return( 0 );
690 }
691
692
693 /* Initialize the LANCE Rx and Tx rings. */
694
695 static void lance_init_ring( struct net_device *dev )
696
697 { struct lance_private *lp = (struct lance_private *)dev->priv;
698 int i;
699 unsigned offset;
700
701 lp->tx_full = 0;
702 lp->cur_rx = lp->cur_tx = 0;
703 lp->dirty_tx = 0;
704
705 offset = offsetof( struct lance_memory, packet_area );
706
707 /* If the packet buffer at offset 'o' would conflict with the reserved area
708 * of RieblCards, advance it */
709 #define CHECK_OFFSET(o) \
710 do { \
711 if (lp->cardtype == OLD_RIEBL || lp->cardtype == NEW_RIEBL) { \
712 if (((o) < RIEBL_RSVD_START) ? (o)+PKT_BUF_SZ > RIEBL_RSVD_START \
713 : (o) < RIEBL_RSVD_END) \
714 (o) = RIEBL_RSVD_END; \
715 } \
716 } while(0)
717
718 for( i = 0; i < TX_RING_SIZE; i++ ) {
719 CHECK_OFFSET(offset);
720 MEM->tx_head[i].base = offset;
721 MEM->tx_head[i].flag = TMD1_OWN_HOST;
722 MEM->tx_head[i].base_hi = 0;
723 MEM->tx_head[i].length = 0;
724 MEM->tx_head[i].misc = 0;
725 offset += PKT_BUF_SZ;
726 }
727
728 for( i = 0; i < RX_RING_SIZE; i++ ) {
729 CHECK_OFFSET(offset);
730 MEM->rx_head[i].base = offset;
731 MEM->rx_head[i].flag = TMD1_OWN_CHIP;
732 MEM->rx_head[i].base_hi = 0;
733 MEM->rx_head[i].buf_length = -PKT_BUF_SZ;
734 MEM->rx_head[i].msg_length = 0;
735 offset += PKT_BUF_SZ;
736 }
737 }
738
739
740 /* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX */
741
742
743 static void lance_tx_timeout (struct net_device *dev)
744 {
745 struct lance_private *lp = (struct lance_private *) dev->priv;
746 struct lance_ioreg *IO = lp->iobase;
747
748 AREG = CSR0;
749 DPRINTK( 1, ( "%s: transmit timed out, status %04x, resetting.\n",
750 dev->name, DREG ));
751 DREG = CSR0_STOP;
752 /*
753 * Always set BSWP after a STOP as STOP puts it back into
754 * little endian mode.
755 */
756 REGA( CSR3 ) = CSR3_BSWP | (lp->cardtype == PAM_CARD ? CSR3_ACON : 0);
757 lp->stats.tx_errors++;
758 #ifndef final_version
759 { int i;
760 DPRINTK( 2, ( "Ring data: dirty_tx %d cur_tx %d%s cur_rx %d\n",
761 lp->dirty_tx, lp->cur_tx,
762 lp->tx_full ? " (full)" : "",
763 lp->cur_rx ));
764 for( i = 0 ; i < RX_RING_SIZE; i++ )
765 DPRINTK( 2, ( "rx #%d: base=%04x blen=%04x mlen=%04x\n",
766 i, MEM->rx_head[i].base,
767 -MEM->rx_head[i].buf_length,
768 MEM->rx_head[i].msg_length ));
769 for( i = 0 ; i < TX_RING_SIZE; i++ )
770 DPRINTK( 2, ( "tx #%d: base=%04x len=%04x misc=%04x\n",
771 i, MEM->tx_head[i].base,
772 -MEM->tx_head[i].length,
773 MEM->tx_head[i].misc ));
774 }
775 #endif
776 /* XXX MSch: maybe purge/reinit ring here */
777 /* lance_restart, essentially */
778 lance_init_ring(dev);
779 REGA( CSR0 ) = CSR0_INEA | CSR0_INIT | CSR0_STRT;
780 dev->trans_start = jiffies;
781 netif_wake_queue (dev);
782 }
783
784 /* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX */
785
786 static int lance_start_xmit( struct sk_buff *skb, struct net_device *dev )
787
788 { struct lance_private *lp = (struct lance_private *)dev->priv;
789 struct lance_ioreg *IO = lp->iobase;
790 int entry, len;
791 struct lance_tx_head *head;
792 unsigned long flags;
793
794 DPRINTK( 2, ( "%s: lance_start_xmit() called, csr0 %4.4x.\n",
795 dev->name, DREG ));
796
797
798 /* The old LANCE chips doesn't automatically pad buffers to min. size. */
799 len = skb->len;
800 if (len < ETH_ZLEN)
801 len = ETH_ZLEN;
802 /* PAM-Card has a bug: Can only send packets with even number of bytes! */
803 else if (lp->cardtype == PAM_CARD && (len & 1))
804 ++len;
805
806 if (len > skb->len) {
807 skb = skb_padto(skb, len);
808 if (skb == NULL)
809 return 0;
810 }
811
812 netif_stop_queue (dev);
813
814 /* Fill in a Tx ring entry */
815 if (lance_debug >= 3) {
816 u_char *p;
817 int i;
818 printk( "%s: TX pkt type 0x%04x from ", dev->name,
819 ((u_short *)skb->data)[6]);
820 for( p = &((u_char *)skb->data)[6], i = 0; i < 6; i++ )
821 printk("%02x%s", *p++, i != 5 ? ":" : "" );
822 printk(" to ");
823 for( p = (u_char *)skb->data, i = 0; i < 6; i++ )
824 printk("%02x%s", *p++, i != 5 ? ":" : "" );
825 printk(" data at 0x%08x len %d\n", (int)skb->data,
826 (int)skb->len );
827 }
828
829 /* We're not prepared for the int until the last flags are set/reset. And
830 * the int may happen already after setting the OWN_CHIP... */
831 spin_lock_irqsave (&lp->devlock, flags);
832
833 /* Mask to ring buffer boundary. */
834 entry = lp->cur_tx & TX_RING_MOD_MASK;
835 head = &(MEM->tx_head[entry]);
836
837 /* Caution: the write order is important here, set the "ownership" bits
838 * last.
839 */
840
841
842 head->length = -len;
843 head->misc = 0;
844 lp->memcpy_f( PKTBUF_ADDR(head), (void *)skb->data, skb->len );
845 head->flag = TMD1_OWN_CHIP | TMD1_ENP | TMD1_STP;
846 lp->stats.tx_bytes += skb->len;
847 dev_kfree_skb( skb );
848 lp->cur_tx++;
849 while( lp->cur_tx >= TX_RING_SIZE && lp->dirty_tx >= TX_RING_SIZE ) {
850 lp->cur_tx -= TX_RING_SIZE;
851 lp->dirty_tx -= TX_RING_SIZE;
852 }
853
854 /* Trigger an immediate send poll. */
855 DREG = CSR0_INEA | CSR0_TDMD;
856 dev->trans_start = jiffies;
857
858 if ((MEM->tx_head[(entry+1) & TX_RING_MOD_MASK].flag & TMD1_OWN) ==
859 TMD1_OWN_HOST)
860 netif_start_queue (dev);
861 else
862 lp->tx_full = 1;
863 spin_unlock_irqrestore (&lp->devlock, flags);
864
865 return 0;
866 }
867
868 /* The LANCE interrupt handler. */
869
870 static irqreturn_t lance_interrupt( int irq, void *dev_id, struct pt_regs *fp)
871 {
872 struct net_device *dev = dev_id;
873 struct lance_private *lp;
874 struct lance_ioreg *IO;
875 int csr0, boguscnt = 10;
876 int handled = 0;
877
878 if (dev == NULL) {
879 DPRINTK( 1, ( "lance_interrupt(): interrupt for unknown device.\n" ));
880 return IRQ_NONE;
881 }
882
883 lp = (struct lance_private *)dev->priv;
884 IO = lp->iobase;
885 spin_lock (&lp->devlock);
886
887 AREG = CSR0;
888
889 while( ((csr0 = DREG) & (CSR0_ERR | CSR0_TINT | CSR0_RINT)) &&
890 --boguscnt >= 0) {
891 handled = 1;
892 /* Acknowledge all of the current interrupt sources ASAP. */
893 DREG = csr0 & ~(CSR0_INIT | CSR0_STRT | CSR0_STOP |
894 CSR0_TDMD | CSR0_INEA);
895
896 DPRINTK( 2, ( "%s: interrupt csr0=%04x new csr=%04x.\n",
897 dev->name, csr0, DREG ));
898
899 if (csr0 & CSR0_RINT) /* Rx interrupt */
900 lance_rx( dev );
901
902 if (csr0 & CSR0_TINT) { /* Tx-done interrupt */
903 int dirty_tx = lp->dirty_tx;
904
905 while( dirty_tx < lp->cur_tx) {
906 int entry = dirty_tx & TX_RING_MOD_MASK;
907 int status = MEM->tx_head[entry].flag;
908
909 if (status & TMD1_OWN_CHIP)
910 break; /* It still hasn't been Txed */
911
912 MEM->tx_head[entry].flag = 0;
913
914 if (status & TMD1_ERR) {
915 /* There was an major error, log it. */
916 int err_status = MEM->tx_head[entry].misc;
917 lp->stats.tx_errors++;
918 if (err_status & TMD3_RTRY) lp->stats.tx_aborted_errors++;
919 if (err_status & TMD3_LCAR) lp->stats.tx_carrier_errors++;
920 if (err_status & TMD3_LCOL) lp->stats.tx_window_errors++;
921 if (err_status & TMD3_UFLO) {
922 /* Ackk! On FIFO errors the Tx unit is turned off! */
923 lp->stats.tx_fifo_errors++;
924 /* Remove this verbosity later! */
925 DPRINTK( 1, ( "%s: Tx FIFO error! Status %04x\n",
926 dev->name, csr0 ));
927 /* Restart the chip. */
928 DREG = CSR0_STRT;
929 }
930 } else {
931 if (status & (TMD1_MORE | TMD1_ONE | TMD1_DEF))
932 lp->stats.collisions++;
933 lp->stats.tx_packets++;
934 }
935
936 /* XXX MSch: free skb?? */
937 dirty_tx++;
938 }
939
940 #ifndef final_version
941 if (lp->cur_tx - dirty_tx >= TX_RING_SIZE) {
942 DPRINTK( 0, ( "out-of-sync dirty pointer,"
943 " %d vs. %d, full=%ld.\n",
944 dirty_tx, lp->cur_tx, lp->tx_full ));
945 dirty_tx += TX_RING_SIZE;
946 }
947 #endif
948
949 if (lp->tx_full && (netif_queue_stopped(dev))
950 && dirty_tx > lp->cur_tx - TX_RING_SIZE + 2) {
951 /* The ring is no longer full, clear tbusy. */
952 lp->tx_full = 0;
953 netif_wake_queue (dev);
954 }
955
956 lp->dirty_tx = dirty_tx;
957 }
958
959 /* Log misc errors. */
960 if (csr0 & CSR0_BABL) lp->stats.tx_errors++; /* Tx babble. */
961 if (csr0 & CSR0_MISS) lp->stats.rx_errors++; /* Missed a Rx frame. */
962 if (csr0 & CSR0_MERR) {
963 DPRINTK( 1, ( "%s: Bus master arbitration failure (?!?), "
964 "status %04x.\n", dev->name, csr0 ));
965 /* Restart the chip. */
966 DREG = CSR0_STRT;
967 }
968 }
969
970 /* Clear any other interrupt, and set interrupt enable. */
971 DREG = CSR0_BABL | CSR0_CERR | CSR0_MISS | CSR0_MERR |
972 CSR0_IDON | CSR0_INEA;
973
974 DPRINTK( 2, ( "%s: exiting interrupt, csr0=%#04x.\n",
975 dev->name, DREG ));
976
977 spin_unlock (&lp->devlock);
978 return IRQ_RETVAL(handled);
979 }
980
981
982 static int lance_rx( struct net_device *dev )
983
984 { struct lance_private *lp = (struct lance_private *)dev->priv;
985 int entry = lp->cur_rx & RX_RING_MOD_MASK;
986 int i;
987
988 DPRINTK( 2, ( "%s: rx int, flag=%04x\n", dev->name,
989 MEM->rx_head[entry].flag ));
990
991 /* If we own the next entry, it's a new packet. Send it up. */
992 while( (MEM->rx_head[entry].flag & RMD1_OWN) == RMD1_OWN_HOST ) {
993 struct lance_rx_head *head = &(MEM->rx_head[entry]);
994 int status = head->flag;
995
996 if (status != (RMD1_ENP|RMD1_STP)) { /* There was an error. */
997 /* There is a tricky error noted by John Murphy,
998 <murf@perftech.com> to Russ Nelson: Even with full-sized
999 buffers it's possible for a jabber packet to use two
1000 buffers, with only the last correctly noting the error. */
1001 if (status & RMD1_ENP) /* Only count a general error at the */
1002 lp->stats.rx_errors++; /* end of a packet.*/
1003 if (status & RMD1_FRAM) lp->stats.rx_frame_errors++;
1004 if (status & RMD1_OFLO) lp->stats.rx_over_errors++;
1005 if (status & RMD1_CRC) lp->stats.rx_crc_errors++;
1006 if (status & RMD1_BUFF) lp->stats.rx_fifo_errors++;
1007 head->flag &= (RMD1_ENP|RMD1_STP);
1008 } else {
1009 /* Malloc up new buffer, compatible with net-3. */
1010 short pkt_len = head->msg_length & 0xfff;
1011 struct sk_buff *skb;
1012
1013 if (pkt_len < 60) {
1014 printk( "%s: Runt packet!\n", dev->name );
1015 lp->stats.rx_errors++;
1016 }
1017 else {
1018 skb = dev_alloc_skb( pkt_len+2 );
1019 if (skb == NULL) {
1020 DPRINTK( 1, ( "%s: Memory squeeze, deferring packet.\n",
1021 dev->name ));
1022 for( i = 0; i < RX_RING_SIZE; i++ )
1023 if (MEM->rx_head[(entry+i) & RX_RING_MOD_MASK].flag &
1024 RMD1_OWN_CHIP)
1025 break;
1026
1027 if (i > RX_RING_SIZE - 2) {
1028 lp->stats.rx_dropped++;
1029 head->flag |= RMD1_OWN_CHIP;
1030 lp->cur_rx++;
1031 }
1032 break;
1033 }
1034
1035 if (lance_debug >= 3) {
1036 u_char *data = PKTBUF_ADDR(head), *p;
1037 printk( "%s: RX pkt type 0x%04x from ", dev->name,
1038 ((u_short *)data)[6]);
1039 for( p = &data[6], i = 0; i < 6; i++ )
1040 printk("%02x%s", *p++, i != 5 ? ":" : "" );
1041 printk(" to ");
1042 for( p = data, i = 0; i < 6; i++ )
1043 printk("%02x%s", *p++, i != 5 ? ":" : "" );
1044 printk(" data %02x %02x %02x %02x %02x %02x %02x %02x "
1045 "len %d\n",
1046 data[15], data[16], data[17], data[18],
1047 data[19], data[20], data[21], data[22],
1048 pkt_len );
1049 }
1050
1051 skb->dev = dev;
1052 skb_reserve( skb, 2 ); /* 16 byte align */
1053 skb_put( skb, pkt_len ); /* Make room */
1054 lp->memcpy_f( skb->data, PKTBUF_ADDR(head), pkt_len );
1055 skb->protocol = eth_type_trans( skb, dev );
1056 netif_rx( skb );
1057 dev->last_rx = jiffies;
1058 lp->stats.rx_packets++;
1059 lp->stats.rx_bytes += pkt_len;
1060 }
1061 }
1062
1063 head->flag |= RMD1_OWN_CHIP;
1064 entry = (++lp->cur_rx) & RX_RING_MOD_MASK;
1065 }
1066 lp->cur_rx &= RX_RING_MOD_MASK;
1067
1068 /* From lance.c (Donald Becker): */
1069 /* We should check that at least two ring entries are free. If not,
1070 we should free one and mark stats->rx_dropped++. */
1071
1072 return 0;
1073 }
1074
1075
1076 static int lance_close( struct net_device *dev )
1077
1078 { struct lance_private *lp = (struct lance_private *)dev->priv;
1079 struct lance_ioreg *IO = lp->iobase;
1080
1081 netif_stop_queue (dev);
1082
1083 AREG = CSR0;
1084
1085 DPRINTK( 2, ( "%s: Shutting down ethercard, status was %2.2x.\n",
1086 dev->name, DREG ));
1087
1088 /* We stop the LANCE here -- it occasionally polls
1089 memory if we don't. */
1090 DREG = CSR0_STOP;
1091
1092 return 0;
1093 }
1094
1095
1096 static struct net_device_stats *lance_get_stats( struct net_device *dev )
1097
1098 { struct lance_private *lp = (struct lance_private *)dev->priv;
1099
1100 return &lp->stats;
1101 }
1102
1103
1104 /* Set or clear the multicast filter for this adaptor.
1105 num_addrs == -1 Promiscuous mode, receive all packets
1106 num_addrs == 0 Normal mode, clear multicast list
1107 num_addrs > 0 Multicast mode, receive normal and MC packets, and do
1108 best-effort filtering.
1109 */
1110
1111 static void set_multicast_list( struct net_device *dev )
1112
1113 { struct lance_private *lp = (struct lance_private *)dev->priv;
1114 struct lance_ioreg *IO = lp->iobase;
1115
1116 if (netif_running(dev))
1117 /* Only possible if board is already started */
1118 return;
1119
1120 /* We take the simple way out and always enable promiscuous mode. */
1121 DREG = CSR0_STOP; /* Temporarily stop the lance. */
1122
1123 if (dev->flags & IFF_PROMISC) {
1124 /* Log any net taps. */
1125 DPRINTK( 1, ( "%s: Promiscuous mode enabled.\n", dev->name ));
1126 REGA( CSR15 ) = 0x8000; /* Set promiscuous mode */
1127 } else {
1128 short multicast_table[4];
1129 int num_addrs = dev->mc_count;
1130 int i;
1131 /* We don't use the multicast table, but rely on upper-layer
1132 * filtering. */
1133 memset( multicast_table, (num_addrs == 0) ? 0 : -1,
1134 sizeof(multicast_table) );
1135 for( i = 0; i < 4; i++ )
1136 REGA( CSR8+i ) = multicast_table[i];
1137 REGA( CSR15 ) = 0; /* Unset promiscuous mode */
1138 }
1139
1140 /*
1141 * Always set BSWP after a STOP as STOP puts it back into
1142 * little endian mode.
1143 */
1144 REGA( CSR3 ) = CSR3_BSWP | (lp->cardtype == PAM_CARD ? CSR3_ACON : 0);
1145
1146 /* Resume normal operation and reset AREG to CSR0 */
1147 REGA( CSR0 ) = CSR0_IDON | CSR0_INEA | CSR0_STRT;
1148 }
1149
1150
1151 /* This is needed for old RieblCards and possible for new RieblCards */
1152
1153 static int lance_set_mac_address( struct net_device *dev, void *addr )
1154
1155 { struct lance_private *lp = (struct lance_private *)dev->priv;
1156 struct sockaddr *saddr = addr;
1157 int i;
1158
1159 if (lp->cardtype != OLD_RIEBL && lp->cardtype != NEW_RIEBL)
1160 return( -EOPNOTSUPP );
1161
1162 if (netif_running(dev)) {
1163 /* Only possible while card isn't started */
1164 DPRINTK( 1, ( "%s: hwaddr can be set only while card isn't open.\n",
1165 dev->name ));
1166 return( -EIO );
1167 }
1168
1169 memcpy( dev->dev_addr, saddr->sa_data, dev->addr_len );
1170 for( i = 0; i < 6; i++ )
1171 MEM->init.hwaddr[i] = dev->dev_addr[i^1]; /* <- 16 bit swap! */
1172 lp->memcpy_f( RIEBL_HWADDR_ADDR, dev->dev_addr, 6 );
1173 /* set also the magic for future sessions */
1174 *RIEBL_MAGIC_ADDR = RIEBL_MAGIC;
1175
1176 return( 0 );
1177 }
1178
1179 \f
1180 #ifdef MODULE
1181 static struct net_device *atarilance_dev;
1182
1183 int init_module(void)
1184 {
1185 atarilance_dev = atarilance_probe(-1);
1186 if (IS_ERR(atarilance_dev))
1187 return PTR_ERR(atarilance_dev);
1188 return 0;
1189 }
1190
1191 void cleanup_module(void)
1192 {
1193 unregister_netdev(atarilance_dev);
1194 free_irq(atarilance_dev->irq, atarilance_dev);
1195 free_netdev(atarilance_dev);
1196 }
1197
1198 #endif /* MODULE */
1199 \f
1200
1201 /*
1202 * Local variables:
1203 * c-indent-level: 4
1204 * tab-width: 4
1205 * End:
1206 */
Verdex Pro support