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Revert "[PATCH] paravirt: Add startup infrastructure for paravirtualization"
[pv_ops_mirror.git] / drivers / net / atarilance.c
blobdfa8b9ba4c8017d928f69e768f88afc762f82d33
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 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 );
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
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
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 if (skb_padto(skb, len))
808 return 0;
809 }
810
811 netif_stop_queue (dev);
812
813 /* Fill in a Tx ring entry */
814 if (lance_debug >= 3) {
815 u_char *p;
816 int i;
817 printk( "%s: TX pkt type 0x%04x from ", dev->name,
818 ((u_short *)skb->data)[6]);
819 for( p = &((u_char *)skb->data)[6], i = 0; i < 6; i++ )
820 printk("%02x%s", *p++, i != 5 ? ":" : "" );
821 printk(" to ");
822 for( p = (u_char *)skb->data, i = 0; i < 6; i++ )
823 printk("%02x%s", *p++, i != 5 ? ":" : "" );
824 printk(" data at 0x%08x len %d\n", (int)skb->data,
825 (int)skb->len );
826 }
827
828 /* We're not prepared for the int until the last flags are set/reset. And
829 * the int may happen already after setting the OWN_CHIP... */
830 spin_lock_irqsave (&lp->devlock, flags);
831
832 /* Mask to ring buffer boundary. */
833 entry = lp->cur_tx & TX_RING_MOD_MASK;
834 head = &(MEM->tx_head[entry]);
835
836 /* Caution: the write order is important here, set the "ownership" bits
837 * last.
838 */
839
840
841 head->length = -len;
842 head->misc = 0;
843 lp->memcpy_f( PKTBUF_ADDR(head), (void *)skb->data, skb->len );
844 head->flag = TMD1_OWN_CHIP | TMD1_ENP | TMD1_STP;
845 lp->stats.tx_bytes += skb->len;
846 dev_kfree_skb( skb );
847 lp->cur_tx++;
848 while( lp->cur_tx >= TX_RING_SIZE && lp->dirty_tx >= TX_RING_SIZE ) {
849 lp->cur_tx -= TX_RING_SIZE;
850 lp->dirty_tx -= TX_RING_SIZE;
851 }
852
853 /* Trigger an immediate send poll. */
854 DREG = CSR0_INEA | CSR0_TDMD;
855 dev->trans_start = jiffies;
856
857 if ((MEM->tx_head[(entry+1) & TX_RING_MOD_MASK].flag & TMD1_OWN) ==
858 TMD1_OWN_HOST)
859 netif_start_queue (dev);
860 else
861 lp->tx_full = 1;
862 spin_unlock_irqrestore (&lp->devlock, flags);
863
864 return 0;
865 }
866
867 /* The LANCE interrupt handler. */
868
869 static irqreturn_t lance_interrupt( int irq, void *dev_id )
870 {
871 struct net_device *dev = dev_id;
872 struct lance_private *lp;
873 struct lance_ioreg *IO;
874 int csr0, boguscnt = 10;
875 int handled = 0;
876
877 if (dev == NULL) {
878 DPRINTK( 1, ( "lance_interrupt(): interrupt for unknown device.\n" ));
879 return IRQ_NONE;
880 }
881
882 lp = (struct lance_private *)dev->priv;
883 IO = lp->iobase;
884 spin_lock (&lp->devlock);
885
886 AREG = CSR0;
887
888 while( ((csr0 = DREG) & (CSR0_ERR | CSR0_TINT | CSR0_RINT)) &&
889 --boguscnt >= 0) {
890 handled = 1;
891 /* Acknowledge all of the current interrupt sources ASAP. */
892 DREG = csr0 & ~(CSR0_INIT | CSR0_STRT | CSR0_STOP |
893 CSR0_TDMD | CSR0_INEA);
894
895 DPRINTK( 2, ( "%s: interrupt csr0=%04x new csr=%04x.\n",
896 dev->name, csr0, DREG ));
897
898 if (csr0 & CSR0_RINT) /* Rx interrupt */
899 lance_rx( dev );
900
901 if (csr0 & CSR0_TINT) { /* Tx-done interrupt */
902 int dirty_tx = lp->dirty_tx;
903
904 while( dirty_tx < lp->cur_tx) {
905 int entry = dirty_tx & TX_RING_MOD_MASK;
906 int status = MEM->tx_head[entry].flag;
907
908 if (status & TMD1_OWN_CHIP)
909 break; /* It still hasn't been Txed */
910
911 MEM->tx_head[entry].flag = 0;
912
913 if (status & TMD1_ERR) {
914 /* There was an major error, log it. */
915 int err_status = MEM->tx_head[entry].misc;
916 lp->stats.tx_errors++;
917 if (err_status & TMD3_RTRY) lp->stats.tx_aborted_errors++;
918 if (err_status & TMD3_LCAR) lp->stats.tx_carrier_errors++;
919 if (err_status & TMD3_LCOL) lp->stats.tx_window_errors++;
920 if (err_status & TMD3_UFLO) {
921 /* Ackk! On FIFO errors the Tx unit is turned off! */
922 lp->stats.tx_fifo_errors++;
923 /* Remove this verbosity later! */
924 DPRINTK( 1, ( "%s: Tx FIFO error! Status %04x\n",
925 dev->name, csr0 ));
926 /* Restart the chip. */
927 DREG = CSR0_STRT;
928 }
929 } else {
930 if (status & (TMD1_MORE | TMD1_ONE | TMD1_DEF))
931 lp->stats.collisions++;
932 lp->stats.tx_packets++;
933 }
934
935 /* XXX MSch: free skb?? */
936 dirty_tx++;
937 }
938
939 #ifndef final_version
940 if (lp->cur_tx - dirty_tx >= TX_RING_SIZE) {
941 DPRINTK( 0, ( "out-of-sync dirty pointer,"
942 " %d vs. %d, full=%ld.\n",
943 dirty_tx, lp->cur_tx, lp->tx_full ));
944 dirty_tx += TX_RING_SIZE;
945 }
946 #endif
947
948 if (lp->tx_full && (netif_queue_stopped(dev))
949 && dirty_tx > lp->cur_tx - TX_RING_SIZE + 2) {
950 /* The ring is no longer full, clear tbusy. */
951 lp->tx_full = 0;
952 netif_wake_queue (dev);
953 }
954
955 lp->dirty_tx = dirty_tx;
956 }
957
958 /* Log misc errors. */
959 if (csr0 & CSR0_BABL) lp->stats.tx_errors++; /* Tx babble. */
960 if (csr0 & CSR0_MISS) lp->stats.rx_errors++; /* Missed a Rx frame. */
961 if (csr0 & CSR0_MERR) {
962 DPRINTK( 1, ( "%s: Bus master arbitration failure (?!?), "
963 "status %04x.\n", dev->name, csr0 ));
964 /* Restart the chip. */
965 DREG = CSR0_STRT;
966 }
967 }
968
969 /* Clear any other interrupt, and set interrupt enable. */
970 DREG = CSR0_BABL | CSR0_CERR | CSR0_MISS | CSR0_MERR |
971 CSR0_IDON | CSR0_INEA;
972
973 DPRINTK( 2, ( "%s: exiting interrupt, csr0=%#04x.\n",
974 dev->name, DREG ));
975
976 spin_unlock (&lp->devlock);
977 return IRQ_RETVAL(handled);
978 }
979
980
981 static int lance_rx( struct net_device *dev )
982
983 { struct lance_private *lp = (struct lance_private *)dev->priv;
984 int entry = lp->cur_rx & RX_RING_MOD_MASK;
985 int i;
986
987 DPRINTK( 2, ( "%s: rx int, flag=%04x\n", dev->name,
988 MEM->rx_head[entry].flag ));
989
990 /* If we own the next entry, it's a new packet. Send it up. */
991 while( (MEM->rx_head[entry].flag & RMD1_OWN) == RMD1_OWN_HOST ) {
992 struct lance_rx_head *head = &(MEM->rx_head[entry]);
993 int status = head->flag;
994
995 if (status != (RMD1_ENP|RMD1_STP)) { /* There was an error. */
996 /* There is a tricky error noted by John Murphy,
997 <murf@perftech.com> to Russ Nelson: Even with full-sized
998 buffers it's possible for a jabber packet to use two
999 buffers, with only the last correctly noting the error. */
1000 if (status & RMD1_ENP) /* Only count a general error at the */
1001 lp->stats.rx_errors++; /* end of a packet.*/
1002 if (status & RMD1_FRAM) lp->stats.rx_frame_errors++;
1003 if (status & RMD1_OFLO) lp->stats.rx_over_errors++;
1004 if (status & RMD1_CRC) lp->stats.rx_crc_errors++;
1005 if (status & RMD1_BUFF) lp->stats.rx_fifo_errors++;
1006 head->flag &= (RMD1_ENP|RMD1_STP);
1007 } else {
1008 /* Malloc up new buffer, compatible with net-3. */
1009 short pkt_len = head->msg_length & 0xfff;
1010 struct sk_buff *skb;
1011
1012 if (pkt_len < 60) {
1013 printk( "%s: Runt packet!\n", dev->name );
1014 lp->stats.rx_errors++;
1015 }
1016 else {
1017 skb = dev_alloc_skb( pkt_len+2 );
1018 if (skb == NULL) {
1019 DPRINTK( 1, ( "%s: Memory squeeze, deferring packet.\n",
1020 dev->name ));
1021 for( i = 0; i < RX_RING_SIZE; i++ )
1022 if (MEM->rx_head[(entry+i) & RX_RING_MOD_MASK].flag &
1023 RMD1_OWN_CHIP)
1024 break;
1025
1026 if (i > RX_RING_SIZE - 2) {
1027 lp->stats.rx_dropped++;
1028 head->flag |= RMD1_OWN_CHIP;
1029 lp->cur_rx++;
1030 }
1031 break;
1032 }
1033
1034 if (lance_debug >= 3) {
1035 u_char *data = PKTBUF_ADDR(head), *p;
1036 printk( "%s: RX pkt type 0x%04x from ", dev->name,
1037 ((u_short *)data)[6]);
1038 for( p = &data[6], i = 0; i < 6; i++ )
1039 printk("%02x%s", *p++, i != 5 ? ":" : "" );
1040 printk(" to ");
1041 for( p = data, i = 0; i < 6; i++ )
1042 printk("%02x%s", *p++, i != 5 ? ":" : "" );
1043 printk(" data %02x %02x %02x %02x %02x %02x %02x %02x "
1044 "len %d\n",
1045 data[15], data[16], data[17], data[18],
1046 data[19], data[20], data[21], data[22],
1047 pkt_len );
1048 }
1049
1050 skb_reserve( skb, 2 ); /* 16 byte align */
1051 skb_put( skb, pkt_len ); /* Make room */
1052 lp->memcpy_f( skb->data, PKTBUF_ADDR(head), pkt_len );
1053 skb->protocol = eth_type_trans( skb, dev );
1054 netif_rx( skb );
1055 dev->last_rx = jiffies;
1056 lp->stats.rx_packets++;
1057 lp->stats.rx_bytes += pkt_len;
1058 }
1059 }
1060
1061 head->flag |= RMD1_OWN_CHIP;
1062 entry = (++lp->cur_rx) & RX_RING_MOD_MASK;
1063 }
1064 lp->cur_rx &= RX_RING_MOD_MASK;
1065
1066 /* From lance.c (Donald Becker): */
1067 /* We should check that at least two ring entries are free. If not,
1068 we should free one and mark stats->rx_dropped++. */
1069
1070 return 0;
1071 }
1072
1073
1074 static int lance_close( struct net_device *dev )
1075
1076 { struct lance_private *lp = (struct lance_private *)dev->priv;
1077 struct lance_ioreg *IO = lp->iobase;
1078
1079 netif_stop_queue (dev);
1080
1081 AREG = CSR0;
1082
1083 DPRINTK( 2, ( "%s: Shutting down ethercard, status was %2.2x.\n",
1084 dev->name, DREG ));
1085
1086 /* We stop the LANCE here -- it occasionally polls
1087 memory if we don't. */
1088 DREG = CSR0_STOP;
1089
1090 return 0;
1091 }
1092
1093
1094 static struct net_device_stats *lance_get_stats( struct net_device *dev )
1095
1096 { struct lance_private *lp = (struct lance_private *)dev->priv;
1097
1098 return &lp->stats;
1099 }
1100
1101
1102 /* Set or clear the multicast filter for this adaptor.
1103 num_addrs == -1 Promiscuous mode, receive all packets
1104 num_addrs == 0 Normal mode, clear multicast list
1105 num_addrs > 0 Multicast mode, receive normal and MC packets, and do
1106 best-effort filtering.
1107 */
1108
1109 static void set_multicast_list( struct net_device *dev )
1110
1111 { struct lance_private *lp = (struct lance_private *)dev->priv;
1112 struct lance_ioreg *IO = lp->iobase;
1113
1114 if (netif_running(dev))
1115 /* Only possible if board is already started */
1116 return;
1117
1118 /* We take the simple way out and always enable promiscuous mode. */
1119 DREG = CSR0_STOP; /* Temporarily stop the lance. */
1120
1121 if (dev->flags & IFF_PROMISC) {
1122 /* Log any net taps. */
1123 DPRINTK( 2, ( "%s: Promiscuous mode enabled.\n", dev->name ));
1124 REGA( CSR15 ) = 0x8000; /* Set promiscuous mode */
1125 } else {
1126 short multicast_table[4];
1127 int num_addrs = dev->mc_count;
1128 int i;
1129 /* We don't use the multicast table, but rely on upper-layer
1130 * filtering. */
1131 memset( multicast_table, (num_addrs == 0) ? 0 : -1,
1132 sizeof(multicast_table) );
1133 for( i = 0; i < 4; i++ )
1134 REGA( CSR8+i ) = multicast_table[i];
1135 REGA( CSR15 ) = 0; /* Unset promiscuous mode */
1136 }
1137
1138 /*
1139 * Always set BSWP after a STOP as STOP puts it back into
1140 * little endian mode.
1141 */
1142 REGA( CSR3 ) = CSR3_BSWP | (lp->cardtype == PAM_CARD ? CSR3_ACON : 0);
1143
1144 /* Resume normal operation and reset AREG to CSR0 */
1145 REGA( CSR0 ) = CSR0_IDON | CSR0_INEA | CSR0_STRT;
1146 }
1147
1148
1149 /* This is needed for old RieblCards and possible for new RieblCards */
1150
1151 static int lance_set_mac_address( struct net_device *dev, void *addr )
1152
1153 { struct lance_private *lp = (struct lance_private *)dev->priv;
1154 struct sockaddr *saddr = addr;
1155 int i;
1156
1157 if (lp->cardtype != OLD_RIEBL && lp->cardtype != NEW_RIEBL)
1158 return( -EOPNOTSUPP );
1159
1160 if (netif_running(dev)) {
1161 /* Only possible while card isn't started */
1162 DPRINTK( 1, ( "%s: hwaddr can be set only while card isn't open.\n",
1163 dev->name ));
1164 return( -EIO );
1165 }
1166
1167 memcpy( dev->dev_addr, saddr->sa_data, dev->addr_len );
1168 for( i = 0; i < 6; i++ )
1169 MEM->init.hwaddr[i] = dev->dev_addr[i^1]; /* <- 16 bit swap! */
1170 lp->memcpy_f( RIEBL_HWADDR_ADDR, dev->dev_addr, 6 );
1171 /* set also the magic for future sessions */
1172 *RIEBL_MAGIC_ADDR = RIEBL_MAGIC;
1173
1174 return( 0 );
1175 }
1176
1177
1178 #ifdef MODULE
1179 static struct net_device *atarilance_dev;
1180
1181 int __init init_module(void)
1182 {
1183 atarilance_dev = atarilance_probe(-1);
1184 if (IS_ERR(atarilance_dev))
1185 return PTR_ERR(atarilance_dev);
1186 return 0;
1187 }
1188
1189 void __exit cleanup_module(void)
1190 {
1191 unregister_netdev(atarilance_dev);
1192 free_irq(atarilance_dev->irq, atarilance_dev);
1193 free_netdev(atarilance_dev);
1194 }
1195
1196 #endif /* MODULE */
1197
1198
1199 /*
1200 * Local variables:
1201 * c-indent-level: 4
1202 * tab-width: 4
1203 * End:
1204 */
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