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[NET] drivers/net: statistics cleanup #1 -- save memory and shrink code
[deliverable/linux.git] / drivers / net / atarilance.c
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_param(lance_debug, int, 0);
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 /* This must be long for set_bit() */
228 long tx_full;
229 spinlock_t devlock;
230 };
231
232 /* I/O register access macros */
233
234 #define MEM lp->mem
235 #define DREG IO->data
236 #define AREG IO->addr
237 #define REGA(a) (*( AREG = (a), &DREG ))
238
239 /* Definitions for packet buffer access: */
240 #define PKT_BUF_SZ 1544
241 /* Get the address of a packet buffer corresponding to a given buffer head */
242 #define PKTBUF_ADDR(head) (((unsigned char *)(MEM)) + (head)->base)
243
244 /* Possible memory/IO addresses for probing */
245
246 struct lance_addr {
247 unsigned long memaddr;
248 unsigned long ioaddr;
249 int slow_flag;
250 } lance_addr_list[] = {
251 { 0xfe010000, 0xfe00fff0, 0 }, /* RieblCard VME in TT */
252 { 0xffc10000, 0xffc0fff0, 0 }, /* RieblCard VME in MegaSTE
253 (highest byte stripped) */
254 { 0xffe00000, 0xffff7000, 1 }, /* RieblCard in ST
255 (highest byte stripped) */
256 { 0xffd00000, 0xffff7000, 1 }, /* RieblCard in ST with hw modif. to
257 avoid conflict with ROM
258 (highest byte stripped) */
259 { 0xffcf0000, 0xffcffff0, 0 }, /* PAMCard VME in TT and MSTE
260 (highest byte stripped) */
261 { 0xfecf0000, 0xfecffff0, 0 }, /* Rhotron's PAMCard VME in TT and MSTE
262 (highest byte stripped) */
263 };
264
265 #define N_LANCE_ADDR ARRAY_SIZE(lance_addr_list)
266
267
268 /* Definitions for the Lance */
269
270 /* tx_head flags */
271 #define TMD1_ENP 0x01 /* end of packet */
272 #define TMD1_STP 0x02 /* start of packet */
273 #define TMD1_DEF 0x04 /* deferred */
274 #define TMD1_ONE 0x08 /* one retry needed */
275 #define TMD1_MORE 0x10 /* more than one retry needed */
276 #define TMD1_ERR 0x40 /* error summary */
277 #define TMD1_OWN 0x80 /* ownership (set: chip owns) */
278
279 #define TMD1_OWN_CHIP TMD1_OWN
280 #define TMD1_OWN_HOST 0
281
282 /* tx_head misc field */
283 #define TMD3_TDR 0x03FF /* Time Domain Reflectometry counter */
284 #define TMD3_RTRY 0x0400 /* failed after 16 retries */
285 #define TMD3_LCAR 0x0800 /* carrier lost */
286 #define TMD3_LCOL 0x1000 /* late collision */
287 #define TMD3_UFLO 0x4000 /* underflow (late memory) */
288 #define TMD3_BUFF 0x8000 /* buffering error (no ENP) */
289
290 /* rx_head flags */
291 #define RMD1_ENP 0x01 /* end of packet */
292 #define RMD1_STP 0x02 /* start of packet */
293 #define RMD1_BUFF 0x04 /* buffer error */
294 #define RMD1_CRC 0x08 /* CRC error */
295 #define RMD1_OFLO 0x10 /* overflow */
296 #define RMD1_FRAM 0x20 /* framing error */
297 #define RMD1_ERR 0x40 /* error summary */
298 #define RMD1_OWN 0x80 /* ownership (set: ship owns) */
299
300 #define RMD1_OWN_CHIP RMD1_OWN
301 #define RMD1_OWN_HOST 0
302
303 /* register names */
304 #define CSR0 0 /* mode/status */
305 #define CSR1 1 /* init block addr (low) */
306 #define CSR2 2 /* init block addr (high) */
307 #define CSR3 3 /* misc */
308 #define CSR8 8 /* address filter */
309 #define CSR15 15 /* promiscuous mode */
310
311 /* CSR0 */
312 /* (R=readable, W=writeable, S=set on write, C=clear on write) */
313 #define CSR0_INIT 0x0001 /* initialize (RS) */
314 #define CSR0_STRT 0x0002 /* start (RS) */
315 #define CSR0_STOP 0x0004 /* stop (RS) */
316 #define CSR0_TDMD 0x0008 /* transmit demand (RS) */
317 #define CSR0_TXON 0x0010 /* transmitter on (R) */
318 #define CSR0_RXON 0x0020 /* receiver on (R) */
319 #define CSR0_INEA 0x0040 /* interrupt enable (RW) */
320 #define CSR0_INTR 0x0080 /* interrupt active (R) */
321 #define CSR0_IDON 0x0100 /* initialization done (RC) */
322 #define CSR0_TINT 0x0200 /* transmitter interrupt (RC) */
323 #define CSR0_RINT 0x0400 /* receiver interrupt (RC) */
324 #define CSR0_MERR 0x0800 /* memory error (RC) */
325 #define CSR0_MISS 0x1000 /* missed frame (RC) */
326 #define CSR0_CERR 0x2000 /* carrier error (no heartbeat :-) (RC) */
327 #define CSR0_BABL 0x4000 /* babble: tx-ed too many bits (RC) */
328 #define CSR0_ERR 0x8000 /* error (RC) */
329
330 /* CSR3 */
331 #define CSR3_BCON 0x0001 /* byte control */
332 #define CSR3_ACON 0x0002 /* ALE control */
333 #define CSR3_BSWP 0x0004 /* byte swap (1=big endian) */
334
335
336
337 /***************************** Prototypes *****************************/
338
339 static int addr_accessible( volatile void *regp, int wordflag, int
340 writeflag );
341 static unsigned long lance_probe1( struct net_device *dev, struct lance_addr
342 *init_rec );
343 static int lance_open( struct net_device *dev );
344 static void lance_init_ring( struct net_device *dev );
345 static int lance_start_xmit( struct sk_buff *skb, struct net_device *dev );
346 static irqreturn_t lance_interrupt( int irq, void *dev_id );
347 static int lance_rx( struct net_device *dev );
348 static int lance_close( struct net_device *dev );
349 static void set_multicast_list( struct net_device *dev );
350 static int lance_set_mac_address( struct net_device *dev, void *addr );
351 static void lance_tx_timeout (struct net_device *dev);
352
353 /************************* End of Prototypes **************************/
354
355
356
357
358
359 static void *slow_memcpy( void *dst, const void *src, size_t len )
360
361 { char *cto = dst;
362 const char *cfrom = src;
363
364 while( len-- ) {
365 *cto++ = *cfrom++;
366 MFPDELAY();
367 }
368 return( dst );
369 }
370
371
372 struct net_device * __init atarilance_probe(int unit)
373 {
374 int i;
375 static int found;
376 struct net_device *dev;
377 int err = -ENODEV;
378
379 if (!MACH_IS_ATARI || found)
380 /* Assume there's only one board possible... That seems true, since
381 * the Riebl/PAM board's address cannot be changed. */
382 return ERR_PTR(-ENODEV);
383
384 dev = alloc_etherdev(sizeof(struct lance_private));
385 if (!dev)
386 return ERR_PTR(-ENOMEM);
387 if (unit >= 0) {
388 sprintf(dev->name, "eth%d", unit);
389 netdev_boot_setup_check(dev);
390 }
391
392 for( i = 0; i < N_LANCE_ADDR; ++i ) {
393 if (lance_probe1( dev, &lance_addr_list[i] )) {
394 found = 1;
395 err = register_netdev(dev);
396 if (!err)
397 return dev;
398 free_irq(dev->irq, dev);
399 break;
400 }
401 }
402 free_netdev(dev);
403 return ERR_PTR(err);
404 }
405
406
407 /* Derived from hwreg_present() in atari/config.c: */
408
409 static int __init addr_accessible( volatile void *regp, int wordflag, int writeflag )
410 {
411 int ret;
412 long flags;
413 long *vbr, save_berr;
414
415 local_irq_save(flags);
416
417 __asm__ __volatile__ ( "movec %/vbr,%0" : "=r" (vbr) : );
418 save_berr = vbr[2];
419
420 __asm__ __volatile__
421 ( "movel %/sp,%/d1\n\t"
422 "movel #Lberr,%2@\n\t"
423 "moveq #0,%0\n\t"
424 "tstl %3\n\t"
425 "bne 1f\n\t"
426 "moveb %1@,%/d0\n\t"
427 "nop \n\t"
428 "bra 2f\n"
429 "1: movew %1@,%/d0\n\t"
430 "nop \n"
431 "2: tstl %4\n\t"
432 "beq 2f\n\t"
433 "tstl %3\n\t"
434 "bne 1f\n\t"
435 "clrb %1@\n\t"
436 "nop \n\t"
437 "moveb %/d0,%1@\n\t"
438 "nop \n\t"
439 "bra 2f\n"
440 "1: clrw %1@\n\t"
441 "nop \n\t"
442 "movew %/d0,%1@\n\t"
443 "nop \n"
444 "2: moveq #1,%0\n"
445 "Lberr: movel %/d1,%/sp"
446 : "=&d" (ret)
447 : "a" (regp), "a" (&vbr[2]), "rm" (wordflag), "rm" (writeflag)
448 : "d0", "d1", "memory"
449 );
450
451 vbr[2] = save_berr;
452 local_irq_restore(flags);
453
454 return( ret );
455 }
456
457
458 static unsigned long __init lance_probe1( struct net_device *dev,
459 struct lance_addr *init_rec )
460 {
461 volatile unsigned short *memaddr =
462 (volatile unsigned short *)init_rec->memaddr;
463 volatile unsigned short *ioaddr =
464 (volatile unsigned short *)init_rec->ioaddr;
465 struct lance_private *lp;
466 struct lance_ioreg *IO;
467 int i;
468 static int did_version;
469 unsigned short save1, save2;
470
471 PROBE_PRINT(( "Probing for Lance card at mem %#lx io %#lx\n",
472 (long)memaddr, (long)ioaddr ));
473
474 /* Test whether memory readable and writable */
475 PROBE_PRINT(( "lance_probe1: testing memory to be accessible\n" ));
476 if (!addr_accessible( memaddr, 1, 1 )) goto probe_fail;
477
478 /* Written values should come back... */
479 PROBE_PRINT(( "lance_probe1: testing memory to be writable (1)\n" ));
480 save1 = *memaddr;
481 *memaddr = 0x0001;
482 if (*memaddr != 0x0001) goto probe_fail;
483 PROBE_PRINT(( "lance_probe1: testing memory to be writable (2)\n" ));
484 *memaddr = 0x0000;
485 if (*memaddr != 0x0000) goto probe_fail;
486 *memaddr = save1;
487
488 /* First port should be readable and writable */
489 PROBE_PRINT(( "lance_probe1: testing ioport to be accessible\n" ));
490 if (!addr_accessible( ioaddr, 1, 1 )) goto probe_fail;
491
492 /* and written values should be readable */
493 PROBE_PRINT(( "lance_probe1: testing ioport to be writeable\n" ));
494 save2 = ioaddr[1];
495 ioaddr[1] = 0x0001;
496 if (ioaddr[1] != 0x0001) goto probe_fail;
497
498 /* The CSR0_INIT bit should not be readable */
499 PROBE_PRINT(( "lance_probe1: testing CSR0 register function (1)\n" ));
500 save1 = ioaddr[0];
501 ioaddr[1] = CSR0;
502 ioaddr[0] = CSR0_INIT | CSR0_STOP;
503 if (ioaddr[0] != CSR0_STOP) {
504 ioaddr[0] = save1;
505 ioaddr[1] = save2;
506 goto probe_fail;
507 }
508 PROBE_PRINT(( "lance_probe1: testing CSR0 register function (2)\n" ));
509 ioaddr[0] = CSR0_STOP;
510 if (ioaddr[0] != CSR0_STOP) {
511 ioaddr[0] = save1;
512 ioaddr[1] = save2;
513 goto probe_fail;
514 }
515
516 /* Now ok... */
517 PROBE_PRINT(( "lance_probe1: Lance card detected\n" ));
518 goto probe_ok;
519
520 probe_fail:
521 return( 0 );
522
523 probe_ok:
524 lp = (struct lance_private *)dev->priv;
525 MEM = (struct lance_memory *)memaddr;
526 IO = lp->iobase = (struct lance_ioreg *)ioaddr;
527 dev->base_addr = (unsigned long)ioaddr; /* informational only */
528 lp->memcpy_f = init_rec->slow_flag ? slow_memcpy : memcpy;
529
530 REGA( CSR0 ) = CSR0_STOP;
531
532 /* Now test for type: If the eeprom I/O port is readable, it is a
533 * PAM card */
534 if (addr_accessible( &(IO->eeprom), 0, 0 )) {
535 /* Switch back to Ram */
536 i = IO->mem;
537 lp->cardtype = PAM_CARD;
538 }
539 else if (*RIEBL_MAGIC_ADDR == RIEBL_MAGIC) {
540 lp->cardtype = NEW_RIEBL;
541 }
542 else
543 lp->cardtype = OLD_RIEBL;
544
545 if (lp->cardtype == PAM_CARD ||
546 memaddr == (unsigned short *)0xffe00000) {
547 /* PAMs card and Riebl on ST use level 5 autovector */
548 if (request_irq(IRQ_AUTO_5, lance_interrupt, IRQ_TYPE_PRIO,
549 "PAM/Riebl-ST Ethernet", dev)) {
550 printk( "Lance: request for irq %d failed\n", IRQ_AUTO_5 );
551 return( 0 );
552 }
553 dev->irq = (unsigned short)IRQ_AUTO_5;
554 }
555 else {
556 /* For VME-RieblCards, request a free VME int;
557 * (This must be unsigned long, since dev->irq is short and the
558 * IRQ_MACHSPEC bit would be cut off...)
559 */
560 unsigned long irq = atari_register_vme_int();
561 if (!irq) {
562 printk( "Lance: request for VME interrupt failed\n" );
563 return( 0 );
564 }
565 if (request_irq(irq, lance_interrupt, IRQ_TYPE_PRIO,
566 "Riebl-VME Ethernet", dev)) {
567 printk( "Lance: request for irq %ld failed\n", irq );
568 return( 0 );
569 }
570 dev->irq = irq;
571 }
572
573 printk("%s: %s at io %#lx, mem %#lx, irq %d%s, hwaddr ",
574 dev->name, lance_names[lp->cardtype],
575 (unsigned long)ioaddr,
576 (unsigned long)memaddr,
577 dev->irq,
578 init_rec->slow_flag ? " (slow memcpy)" : "" );
579
580 /* Get the ethernet address */
581 switch( lp->cardtype ) {
582 case OLD_RIEBL:
583 /* No ethernet address! (Set some default address) */
584 memcpy( dev->dev_addr, OldRieblDefHwaddr, 6 );
585 break;
586 case NEW_RIEBL:
587 lp->memcpy_f( dev->dev_addr, RIEBL_HWADDR_ADDR, 6 );
588 break;
589 case PAM_CARD:
590 i = IO->eeprom;
591 for( i = 0; i < 6; ++i )
592 dev->dev_addr[i] =
593 ((((unsigned short *)MEM)[i*2] & 0x0f) << 4) |
594 ((((unsigned short *)MEM)[i*2+1] & 0x0f));
595 i = IO->mem;
596 break;
597 }
598 for( i = 0; i < 6; ++i )
599 printk( "%02x%s", dev->dev_addr[i], (i < 5) ? ":" : "\n" );
600 if (lp->cardtype == OLD_RIEBL) {
601 printk( "%s: Warning: This is a default ethernet address!\n",
602 dev->name );
603 printk( " Use \"ifconfig hw ether ...\" to set the address.\n" );
604 }
605
606 spin_lock_init(&lp->devlock);
607
608 MEM->init.mode = 0x0000; /* Disable Rx and Tx. */
609 for( i = 0; i < 6; i++ )
610 MEM->init.hwaddr[i] = dev->dev_addr[i^1]; /* <- 16 bit swap! */
611 MEM->init.filter[0] = 0x00000000;
612 MEM->init.filter[1] = 0x00000000;
613 MEM->init.rx_ring.adr_lo = offsetof( struct lance_memory, rx_head );
614 MEM->init.rx_ring.adr_hi = 0;
615 MEM->init.rx_ring.len = RX_RING_LEN_BITS;
616 MEM->init.tx_ring.adr_lo = offsetof( struct lance_memory, tx_head );
617 MEM->init.tx_ring.adr_hi = 0;
618 MEM->init.tx_ring.len = TX_RING_LEN_BITS;
619
620 if (lp->cardtype == PAM_CARD)
621 IO->ivec = IRQ_SOURCE_TO_VECTOR(dev->irq);
622 else
623 *RIEBL_IVEC_ADDR = IRQ_SOURCE_TO_VECTOR(dev->irq);
624
625 if (did_version++ == 0)
626 DPRINTK( 1, ( version ));
627
628 /* The LANCE-specific entries in the device structure. */
629 dev->open = &lance_open;
630 dev->hard_start_xmit = &lance_start_xmit;
631 dev->stop = &lance_close;
632 dev->set_multicast_list = &set_multicast_list;
633 dev->set_mac_address = &lance_set_mac_address;
634
635 /* XXX MSch */
636 dev->tx_timeout = lance_tx_timeout;
637 dev->watchdog_timeo = TX_TIMEOUT;
638
639 return( 1 );
640 }
641
642
643 static int lance_open( struct net_device *dev )
644
645 { struct lance_private *lp = (struct lance_private *)dev->priv;
646 struct lance_ioreg *IO = lp->iobase;
647 int i;
648
649 DPRINTK( 2, ( "%s: lance_open()\n", dev->name ));
650
651 lance_init_ring(dev);
652 /* Re-initialize the LANCE, and start it when done. */
653
654 REGA( CSR3 ) = CSR3_BSWP | (lp->cardtype == PAM_CARD ? CSR3_ACON : 0);
655 REGA( CSR2 ) = 0;
656 REGA( CSR1 ) = 0;
657 REGA( CSR0 ) = CSR0_INIT;
658 /* From now on, AREG is kept to point to CSR0 */
659
660 i = 1000000;
661 while (--i > 0)
662 if (DREG & CSR0_IDON)
663 break;
664 if (i < 0 || (DREG & CSR0_ERR)) {
665 DPRINTK( 2, ( "lance_open(): opening %s failed, i=%d, csr0=%04x\n",
666 dev->name, i, DREG ));
667 DREG = CSR0_STOP;
668 return( -EIO );
669 }
670 DREG = CSR0_IDON;
671 DREG = CSR0_STRT;
672 DREG = CSR0_INEA;
673
674 netif_start_queue (dev);
675
676 DPRINTK( 2, ( "%s: LANCE is open, csr0 %04x\n", dev->name, DREG ));
677
678 return( 0 );
679 }
680
681
682 /* Initialize the LANCE Rx and Tx rings. */
683
684 static void lance_init_ring( struct net_device *dev )
685
686 { struct lance_private *lp = (struct lance_private *)dev->priv;
687 int i;
688 unsigned offset;
689
690 lp->tx_full = 0;
691 lp->cur_rx = lp->cur_tx = 0;
692 lp->dirty_tx = 0;
693
694 offset = offsetof( struct lance_memory, packet_area );
695
696 /* If the packet buffer at offset 'o' would conflict with the reserved area
697 * of RieblCards, advance it */
698 #define CHECK_OFFSET(o) \
699 do { \
700 if (lp->cardtype == OLD_RIEBL || lp->cardtype == NEW_RIEBL) { \
701 if (((o) < RIEBL_RSVD_START) ? (o)+PKT_BUF_SZ > RIEBL_RSVD_START \
702 : (o) < RIEBL_RSVD_END) \
703 (o) = RIEBL_RSVD_END; \
704 } \
705 } while(0)
706
707 for( i = 0; i < TX_RING_SIZE; i++ ) {
708 CHECK_OFFSET(offset);
709 MEM->tx_head[i].base = offset;
710 MEM->tx_head[i].flag = TMD1_OWN_HOST;
711 MEM->tx_head[i].base_hi = 0;
712 MEM->tx_head[i].length = 0;
713 MEM->tx_head[i].misc = 0;
714 offset += PKT_BUF_SZ;
715 }
716
717 for( i = 0; i < RX_RING_SIZE; i++ ) {
718 CHECK_OFFSET(offset);
719 MEM->rx_head[i].base = offset;
720 MEM->rx_head[i].flag = TMD1_OWN_CHIP;
721 MEM->rx_head[i].base_hi = 0;
722 MEM->rx_head[i].buf_length = -PKT_BUF_SZ;
723 MEM->rx_head[i].msg_length = 0;
724 offset += PKT_BUF_SZ;
725 }
726 }
727
728
729 /* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX */
730
731
732 static void lance_tx_timeout (struct net_device *dev)
733 {
734 struct lance_private *lp = (struct lance_private *) dev->priv;
735 struct lance_ioreg *IO = lp->iobase;
736
737 AREG = CSR0;
738 DPRINTK( 1, ( "%s: transmit timed out, status %04x, resetting.\n",
739 dev->name, DREG ));
740 DREG = CSR0_STOP;
741 /*
742 * Always set BSWP after a STOP as STOP puts it back into
743 * little endian mode.
744 */
745 REGA( CSR3 ) = CSR3_BSWP | (lp->cardtype == PAM_CARD ? CSR3_ACON : 0);
746 dev->stats.tx_errors++;
747 #ifndef final_version
748 { int i;
749 DPRINTK( 2, ( "Ring data: dirty_tx %d cur_tx %d%s cur_rx %d\n",
750 lp->dirty_tx, lp->cur_tx,
751 lp->tx_full ? " (full)" : "",
752 lp->cur_rx ));
753 for( i = 0 ; i < RX_RING_SIZE; i++ )
754 DPRINTK( 2, ( "rx #%d: base=%04x blen=%04x mlen=%04x\n",
755 i, MEM->rx_head[i].base,
756 -MEM->rx_head[i].buf_length,
757 MEM->rx_head[i].msg_length ));
758 for( i = 0 ; i < TX_RING_SIZE; i++ )
759 DPRINTK( 2, ( "tx #%d: base=%04x len=%04x misc=%04x\n",
760 i, MEM->tx_head[i].base,
761 -MEM->tx_head[i].length,
762 MEM->tx_head[i].misc ));
763 }
764 #endif
765 /* XXX MSch: maybe purge/reinit ring here */
766 /* lance_restart, essentially */
767 lance_init_ring(dev);
768 REGA( CSR0 ) = CSR0_INEA | CSR0_INIT | CSR0_STRT;
769 dev->trans_start = jiffies;
770 netif_wake_queue (dev);
771 }
772
773 /* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX */
774
775 static int lance_start_xmit( struct sk_buff *skb, struct net_device *dev )
776
777 { struct lance_private *lp = (struct lance_private *)dev->priv;
778 struct lance_ioreg *IO = lp->iobase;
779 int entry, len;
780 struct lance_tx_head *head;
781 unsigned long flags;
782
783 DPRINTK( 2, ( "%s: lance_start_xmit() called, csr0 %4.4x.\n",
784 dev->name, DREG ));
785
786
787 /* The old LANCE chips doesn't automatically pad buffers to min. size. */
788 len = skb->len;
789 if (len < ETH_ZLEN)
790 len = ETH_ZLEN;
791 /* PAM-Card has a bug: Can only send packets with even number of bytes! */
792 else if (lp->cardtype == PAM_CARD && (len & 1))
793 ++len;
794
795 if (len > skb->len) {
796 if (skb_padto(skb, len))
797 return 0;
798 }
799
800 netif_stop_queue (dev);
801
802 /* Fill in a Tx ring entry */
803 if (lance_debug >= 3) {
804 u_char *p;
805 int i;
806 printk( "%s: TX pkt type 0x%04x from ", dev->name,
807 ((u_short *)skb->data)[6]);
808 for( p = &((u_char *)skb->data)[6], i = 0; i < 6; i++ )
809 printk("%02x%s", *p++, i != 5 ? ":" : "" );
810 printk(" to ");
811 for( p = (u_char *)skb->data, i = 0; i < 6; i++ )
812 printk("%02x%s", *p++, i != 5 ? ":" : "" );
813 printk(" data at 0x%08x len %d\n", (int)skb->data,
814 (int)skb->len );
815 }
816
817 /* We're not prepared for the int until the last flags are set/reset. And
818 * the int may happen already after setting the OWN_CHIP... */
819 spin_lock_irqsave (&lp->devlock, flags);
820
821 /* Mask to ring buffer boundary. */
822 entry = lp->cur_tx & TX_RING_MOD_MASK;
823 head = &(MEM->tx_head[entry]);
824
825 /* Caution: the write order is important here, set the "ownership" bits
826 * last.
827 */
828
829
830 head->length = -len;
831 head->misc = 0;
832 lp->memcpy_f( PKTBUF_ADDR(head), (void *)skb->data, skb->len );
833 head->flag = TMD1_OWN_CHIP | TMD1_ENP | TMD1_STP;
834 dev->stats.tx_bytes += skb->len;
835 dev_kfree_skb( skb );
836 lp->cur_tx++;
837 while( lp->cur_tx >= TX_RING_SIZE && lp->dirty_tx >= TX_RING_SIZE ) {
838 lp->cur_tx -= TX_RING_SIZE;
839 lp->dirty_tx -= TX_RING_SIZE;
840 }
841
842 /* Trigger an immediate send poll. */
843 DREG = CSR0_INEA | CSR0_TDMD;
844 dev->trans_start = jiffies;
845
846 if ((MEM->tx_head[(entry+1) & TX_RING_MOD_MASK].flag & TMD1_OWN) ==
847 TMD1_OWN_HOST)
848 netif_start_queue (dev);
849 else
850 lp->tx_full = 1;
851 spin_unlock_irqrestore (&lp->devlock, flags);
852
853 return 0;
854 }
855
856 /* The LANCE interrupt handler. */
857
858 static irqreturn_t lance_interrupt( int irq, void *dev_id )
859 {
860 struct net_device *dev = dev_id;
861 struct lance_private *lp;
862 struct lance_ioreg *IO;
863 int csr0, boguscnt = 10;
864 int handled = 0;
865
866 if (dev == NULL) {
867 DPRINTK( 1, ( "lance_interrupt(): interrupt for unknown device.\n" ));
868 return IRQ_NONE;
869 }
870
871 lp = (struct lance_private *)dev->priv;
872 IO = lp->iobase;
873 spin_lock (&lp->devlock);
874
875 AREG = CSR0;
876
877 while( ((csr0 = DREG) & (CSR0_ERR | CSR0_TINT | CSR0_RINT)) &&
878 --boguscnt >= 0) {
879 handled = 1;
880 /* Acknowledge all of the current interrupt sources ASAP. */
881 DREG = csr0 & ~(CSR0_INIT | CSR0_STRT | CSR0_STOP |
882 CSR0_TDMD | CSR0_INEA);
883
884 DPRINTK( 2, ( "%s: interrupt csr0=%04x new csr=%04x.\n",
885 dev->name, csr0, DREG ));
886
887 if (csr0 & CSR0_RINT) /* Rx interrupt */
888 lance_rx( dev );
889
890 if (csr0 & CSR0_TINT) { /* Tx-done interrupt */
891 int dirty_tx = lp->dirty_tx;
892
893 while( dirty_tx < lp->cur_tx) {
894 int entry = dirty_tx & TX_RING_MOD_MASK;
895 int status = MEM->tx_head[entry].flag;
896
897 if (status & TMD1_OWN_CHIP)
898 break; /* It still hasn't been Txed */
899
900 MEM->tx_head[entry].flag = 0;
901
902 if (status & TMD1_ERR) {
903 /* There was an major error, log it. */
904 int err_status = MEM->tx_head[entry].misc;
905 dev->stats.tx_errors++;
906 if (err_status & TMD3_RTRY) dev->stats.tx_aborted_errors++;
907 if (err_status & TMD3_LCAR) dev->stats.tx_carrier_errors++;
908 if (err_status & TMD3_LCOL) dev->stats.tx_window_errors++;
909 if (err_status & TMD3_UFLO) {
910 /* Ackk! On FIFO errors the Tx unit is turned off! */
911 dev->stats.tx_fifo_errors++;
912 /* Remove this verbosity later! */
913 DPRINTK( 1, ( "%s: Tx FIFO error! Status %04x\n",
914 dev->name, csr0 ));
915 /* Restart the chip. */
916 DREG = CSR0_STRT;
917 }
918 } else {
919 if (status & (TMD1_MORE | TMD1_ONE | TMD1_DEF))
920 dev->stats.collisions++;
921 dev->stats.tx_packets++;
922 }
923
924 /* XXX MSch: free skb?? */
925 dirty_tx++;
926 }
927
928 #ifndef final_version
929 if (lp->cur_tx - dirty_tx >= TX_RING_SIZE) {
930 DPRINTK( 0, ( "out-of-sync dirty pointer,"
931 " %d vs. %d, full=%ld.\n",
932 dirty_tx, lp->cur_tx, lp->tx_full ));
933 dirty_tx += TX_RING_SIZE;
934 }
935 #endif
936
937 if (lp->tx_full && (netif_queue_stopped(dev))
938 && dirty_tx > lp->cur_tx - TX_RING_SIZE + 2) {
939 /* The ring is no longer full, clear tbusy. */
940 lp->tx_full = 0;
941 netif_wake_queue (dev);
942 }
943
944 lp->dirty_tx = dirty_tx;
945 }
946
947 /* Log misc errors. */
948 if (csr0 & CSR0_BABL) dev->stats.tx_errors++; /* Tx babble. */
949 if (csr0 & CSR0_MISS) dev->stats.rx_errors++; /* Missed a Rx frame. */
950 if (csr0 & CSR0_MERR) {
951 DPRINTK( 1, ( "%s: Bus master arbitration failure (?!?), "
952 "status %04x.\n", dev->name, csr0 ));
953 /* Restart the chip. */
954 DREG = CSR0_STRT;
955 }
956 }
957
958 /* Clear any other interrupt, and set interrupt enable. */
959 DREG = CSR0_BABL | CSR0_CERR | CSR0_MISS | CSR0_MERR |
960 CSR0_IDON | CSR0_INEA;
961
962 DPRINTK( 2, ( "%s: exiting interrupt, csr0=%#04x.\n",
963 dev->name, DREG ));
964
965 spin_unlock (&lp->devlock);
966 return IRQ_RETVAL(handled);
967 }
968
969
970 static int lance_rx( struct net_device *dev )
971
972 { struct lance_private *lp = (struct lance_private *)dev->priv;
973 int entry = lp->cur_rx & RX_RING_MOD_MASK;
974 int i;
975
976 DPRINTK( 2, ( "%s: rx int, flag=%04x\n", dev->name,
977 MEM->rx_head[entry].flag ));
978
979 /* If we own the next entry, it's a new packet. Send it up. */
980 while( (MEM->rx_head[entry].flag & RMD1_OWN) == RMD1_OWN_HOST ) {
981 struct lance_rx_head *head = &(MEM->rx_head[entry]);
982 int status = head->flag;
983
984 if (status != (RMD1_ENP|RMD1_STP)) { /* There was an error. */
985 /* There is a tricky error noted by John Murphy,
986 <murf@perftech.com> to Russ Nelson: Even with full-sized
987 buffers it's possible for a jabber packet to use two
988 buffers, with only the last correctly noting the error. */
989 if (status & RMD1_ENP) /* Only count a general error at the */
990 dev->stats.rx_errors++; /* end of a packet.*/
991 if (status & RMD1_FRAM) dev->stats.rx_frame_errors++;
992 if (status & RMD1_OFLO) dev->stats.rx_over_errors++;
993 if (status & RMD1_CRC) dev->stats.rx_crc_errors++;
994 if (status & RMD1_BUFF) dev->stats.rx_fifo_errors++;
995 head->flag &= (RMD1_ENP|RMD1_STP);
996 } else {
997 /* Malloc up new buffer, compatible with net-3. */
998 short pkt_len = head->msg_length & 0xfff;
999 struct sk_buff *skb;
1000
1001 if (pkt_len < 60) {
1002 printk( "%s: Runt packet!\n", dev->name );
1003 dev->stats.rx_errors++;
1004 }
1005 else {
1006 skb = dev_alloc_skb( pkt_len+2 );
1007 if (skb == NULL) {
1008 DPRINTK( 1, ( "%s: Memory squeeze, deferring packet.\n",
1009 dev->name ));
1010 for( i = 0; i < RX_RING_SIZE; i++ )
1011 if (MEM->rx_head[(entry+i) & RX_RING_MOD_MASK].flag &
1012 RMD1_OWN_CHIP)
1013 break;
1014
1015 if (i > RX_RING_SIZE - 2) {
1016 dev->stats.rx_dropped++;
1017 head->flag |= RMD1_OWN_CHIP;
1018 lp->cur_rx++;
1019 }
1020 break;
1021 }
1022
1023 if (lance_debug >= 3) {
1024 u_char *data = PKTBUF_ADDR(head), *p;
1025 printk( "%s: RX pkt type 0x%04x from ", dev->name,
1026 ((u_short *)data)[6]);
1027 for( p = &data[6], i = 0; i < 6; i++ )
1028 printk("%02x%s", *p++, i != 5 ? ":" : "" );
1029 printk(" to ");
1030 for( p = data, i = 0; i < 6; i++ )
1031 printk("%02x%s", *p++, i != 5 ? ":" : "" );
1032 printk(" data %02x %02x %02x %02x %02x %02x %02x %02x "
1033 "len %d\n",
1034 data[15], data[16], data[17], data[18],
1035 data[19], data[20], data[21], data[22],
1036 pkt_len );
1037 }
1038
1039 skb_reserve( skb, 2 ); /* 16 byte align */
1040 skb_put( skb, pkt_len ); /* Make room */
1041 lp->memcpy_f( skb->data, PKTBUF_ADDR(head), pkt_len );
1042 skb->protocol = eth_type_trans( skb, dev );
1043 netif_rx( skb );
1044 dev->last_rx = jiffies;
1045 dev->stats.rx_packets++;
1046 dev->stats.rx_bytes += pkt_len;
1047 }
1048 }
1049
1050 head->flag |= RMD1_OWN_CHIP;
1051 entry = (++lp->cur_rx) & RX_RING_MOD_MASK;
1052 }
1053 lp->cur_rx &= RX_RING_MOD_MASK;
1054
1055 /* From lance.c (Donald Becker): */
1056 /* We should check that at least two ring entries are free. If not,
1057 we should free one and mark stats->rx_dropped++. */
1058
1059 return 0;
1060 }
1061
1062
1063 static int lance_close( struct net_device *dev )
1064
1065 { struct lance_private *lp = (struct lance_private *)dev->priv;
1066 struct lance_ioreg *IO = lp->iobase;
1067
1068 netif_stop_queue (dev);
1069
1070 AREG = CSR0;
1071
1072 DPRINTK( 2, ( "%s: Shutting down ethercard, status was %2.2x.\n",
1073 dev->name, DREG ));
1074
1075 /* We stop the LANCE here -- it occasionally polls
1076 memory if we don't. */
1077 DREG = CSR0_STOP;
1078
1079 return 0;
1080 }
1081
1082
1083 /* Set or clear the multicast filter for this adaptor.
1084 num_addrs == -1 Promiscuous mode, receive all packets
1085 num_addrs == 0 Normal mode, clear multicast list
1086 num_addrs > 0 Multicast mode, receive normal and MC packets, and do
1087 best-effort filtering.
1088 */
1089
1090 static void set_multicast_list( struct net_device *dev )
1091
1092 { struct lance_private *lp = (struct lance_private *)dev->priv;
1093 struct lance_ioreg *IO = lp->iobase;
1094
1095 if (netif_running(dev))
1096 /* Only possible if board is already started */
1097 return;
1098
1099 /* We take the simple way out and always enable promiscuous mode. */
1100 DREG = CSR0_STOP; /* Temporarily stop the lance. */
1101
1102 if (dev->flags & IFF_PROMISC) {
1103 /* Log any net taps. */
1104 DPRINTK( 2, ( "%s: Promiscuous mode enabled.\n", dev->name ));
1105 REGA( CSR15 ) = 0x8000; /* Set promiscuous mode */
1106 } else {
1107 short multicast_table[4];
1108 int num_addrs = dev->mc_count;
1109 int i;
1110 /* We don't use the multicast table, but rely on upper-layer
1111 * filtering. */
1112 memset( multicast_table, (num_addrs == 0) ? 0 : -1,
1113 sizeof(multicast_table) );
1114 for( i = 0; i < 4; i++ )
1115 REGA( CSR8+i ) = multicast_table[i];
1116 REGA( CSR15 ) = 0; /* Unset promiscuous mode */
1117 }
1118
1119 /*
1120 * Always set BSWP after a STOP as STOP puts it back into
1121 * little endian mode.
1122 */
1123 REGA( CSR3 ) = CSR3_BSWP | (lp->cardtype == PAM_CARD ? CSR3_ACON : 0);
1124
1125 /* Resume normal operation and reset AREG to CSR0 */
1126 REGA( CSR0 ) = CSR0_IDON | CSR0_INEA | CSR0_STRT;
1127 }
1128
1129
1130 /* This is needed for old RieblCards and possible for new RieblCards */
1131
1132 static int lance_set_mac_address( struct net_device *dev, void *addr )
1133
1134 { struct lance_private *lp = (struct lance_private *)dev->priv;
1135 struct sockaddr *saddr = addr;
1136 int i;
1137
1138 if (lp->cardtype != OLD_RIEBL && lp->cardtype != NEW_RIEBL)
1139 return( -EOPNOTSUPP );
1140
1141 if (netif_running(dev)) {
1142 /* Only possible while card isn't started */
1143 DPRINTK( 1, ( "%s: hwaddr can be set only while card isn't open.\n",
1144 dev->name ));
1145 return( -EIO );
1146 }
1147
1148 memcpy( dev->dev_addr, saddr->sa_data, dev->addr_len );
1149 for( i = 0; i < 6; i++ )
1150 MEM->init.hwaddr[i] = dev->dev_addr[i^1]; /* <- 16 bit swap! */
1151 lp->memcpy_f( RIEBL_HWADDR_ADDR, dev->dev_addr, 6 );
1152 /* set also the magic for future sessions */
1153 *RIEBL_MAGIC_ADDR = RIEBL_MAGIC;
1154
1155 return( 0 );
1156 }
1157
1158
1159 #ifdef MODULE
1160 static struct net_device *atarilance_dev;
1161
1162 int __init init_module(void)
1163 {
1164 atarilance_dev = atarilance_probe(-1);
1165 if (IS_ERR(atarilance_dev))
1166 return PTR_ERR(atarilance_dev);
1167 return 0;
1168 }
1169
1170 void __exit cleanup_module(void)
1171 {
1172 unregister_netdev(atarilance_dev);
1173 free_irq(atarilance_dev->irq, atarilance_dev);
1174 free_netdev(atarilance_dev);
1175 }
1176
1177 #endif /* MODULE */
1178
1179
1180 /*
1181 * Local variables:
1182 * c-indent-level: 4
1183 * tab-width: 4
1184 * End:
1185 */
Linux kernel - Deliverables
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