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OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4
[zen-stable.git] / drivers / net / ethernet / amd / atarilance.c
blob15bfa28d6c53a0ef36eede8105eb7703b397ba91
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/interrupt.h>
57 #include <linux/init.h>
58 #include <linux/bitops.h>
59
60 #include <asm/setup.h>
61 #include <asm/irq.h>
62 #include <asm/atarihw.h>
63 #include <asm/atariints.h>
64 #include <asm/io.h>
65
66 /* Debug level:
67 * 0 = silent, print only serious errors
68 * 1 = normal, print error messages
69 * 2 = debug, print debug infos
70 * 3 = debug, print even more debug infos (packet data)
71 */
72
73 #define LANCE_DEBUG 1
74
75 #ifdef LANCE_DEBUG
76 static int lance_debug = LANCE_DEBUG;
77 #else
78 static int lance_debug = 1;
79 #endif
80 module_param(lance_debug, int, 0);
81 MODULE_PARM_DESC(lance_debug, "atarilance debug level (0-3)");
82 MODULE_LICENSE("GPL");
83
84 /* Print debug messages on probing? */
85 #undef LANCE_DEBUG_PROBE
86
87 #define DPRINTK(n,a) \
88 do { \
89 if (lance_debug >= n) \
90 printk a; \
91 } while( 0 )
92
93 #ifdef LANCE_DEBUG_PROBE
94 # define PROBE_PRINT(a) printk a
95 #else
96 # define PROBE_PRINT(a)
97 #endif
98
99 /* These define the number of Rx and Tx buffers as log2. (Only powers
100 * of two are valid)
101 * Much more rx buffers (32) are reserved than tx buffers (8), since receiving
102 * is more time critical then sending and packets may have to remain in the
103 * board's memory when main memory is low.
104 */
105
106 #define TX_LOG_RING_SIZE 3
107 #define RX_LOG_RING_SIZE 5
108
109 /* These are the derived values */
110
111 #define TX_RING_SIZE (1 << TX_LOG_RING_SIZE)
112 #define TX_RING_LEN_BITS (TX_LOG_RING_SIZE << 5)
113 #define TX_RING_MOD_MASK (TX_RING_SIZE - 1)
114
115 #define RX_RING_SIZE (1 << RX_LOG_RING_SIZE)
116 #define RX_RING_LEN_BITS (RX_LOG_RING_SIZE << 5)
117 #define RX_RING_MOD_MASK (RX_RING_SIZE - 1)
118
119 #define TX_TIMEOUT (HZ/5)
120
121 /* The LANCE Rx and Tx ring descriptors. */
122 struct lance_rx_head {
123 unsigned short base; /* Low word of base addr */
124 volatile unsigned char flag;
125 unsigned char base_hi; /* High word of base addr (unused) */
126 short buf_length; /* This length is 2s complement! */
127 volatile short msg_length; /* This length is "normal". */
128 };
129
130 struct lance_tx_head {
131 unsigned short base; /* Low word of base addr */
132 volatile unsigned char flag;
133 unsigned char base_hi; /* High word of base addr (unused) */
134 short length; /* Length is 2s complement! */
135 volatile short misc;
136 };
137
138 struct ringdesc {
139 unsigned short adr_lo; /* Low 16 bits of address */
140 unsigned char len; /* Length bits */
141 unsigned char adr_hi; /* High 8 bits of address (unused) */
142 };
143
144 /* The LANCE initialization block, described in databook. */
145 struct lance_init_block {
146 unsigned short mode; /* Pre-set mode */
147 unsigned char hwaddr[6]; /* Physical ethernet address */
148 unsigned filter[2]; /* Multicast filter (unused). */
149 /* Receive and transmit ring base, along with length bits. */
150 struct ringdesc rx_ring;
151 struct ringdesc tx_ring;
152 };
153
154 /* The whole layout of the Lance shared memory */
155 struct lance_memory {
156 struct lance_init_block init;
157 struct lance_tx_head tx_head[TX_RING_SIZE];
158 struct lance_rx_head rx_head[RX_RING_SIZE];
159 char packet_area[0]; /* packet data follow after the
160 * init block and the ring
161 * descriptors and are located
162 * at runtime */
163 };
164
165 /* RieblCard specifics:
166 * The original TOS driver for these cards reserves the area from offset
167 * 0xee70 to 0xeebb for storing configuration data. Of interest to us is the
168 * Ethernet address there, and the magic for verifying the data's validity.
169 * The reserved area isn't touch by packet buffers. Furthermore, offset 0xfffe
170 * is reserved for the interrupt vector number.
171 */
172 #define RIEBL_RSVD_START 0xee70
173 #define RIEBL_RSVD_END 0xeec0
174 #define RIEBL_MAGIC 0x09051990
175 #define RIEBL_MAGIC_ADDR ((unsigned long *)(((char *)MEM) + 0xee8a))
176 #define RIEBL_HWADDR_ADDR ((unsigned char *)(((char *)MEM) + 0xee8e))
177 #define RIEBL_IVEC_ADDR ((unsigned short *)(((char *)MEM) + 0xfffe))
178
179 /* This is a default address for the old RieblCards without a battery
180 * that have no ethernet address at boot time. 00:00:36:04 is the
181 * prefix for Riebl cards, the 00:00 at the end is arbitrary.
182 */
183
184 static unsigned char OldRieblDefHwaddr[6] = {
185 0x00, 0x00, 0x36, 0x04, 0x00, 0x00
186 };
187
188
189 /* I/O registers of the Lance chip */
190
191 struct lance_ioreg {
192 /* base+0x0 */ volatile unsigned short data;
193 /* base+0x2 */ volatile unsigned short addr;
194 unsigned char _dummy1[3];
195 /* base+0x7 */ volatile unsigned char ivec;
196 unsigned char _dummy2[5];
197 /* base+0xd */ volatile unsigned char eeprom;
198 unsigned char _dummy3;
199 /* base+0xf */ volatile unsigned char mem;
200 };
201
202 /* Types of boards this driver supports */
203
204 enum lance_type {
205 OLD_RIEBL, /* old Riebl card without battery */
206 NEW_RIEBL, /* new Riebl card with battery */
207 PAM_CARD /* PAM card with EEPROM */
208 };
209
210 static char *lance_names[] = {
211 "Riebl-Card (without battery)",
212 "Riebl-Card (with battery)",
213 "PAM intern card"
214 };
215
216 /* The driver's private device structure */
217
218 struct lance_private {
219 enum lance_type cardtype;
220 struct lance_ioreg *iobase;
221 struct lance_memory *mem;
222 int cur_rx, cur_tx; /* The next free ring entry */
223 int dirty_tx; /* Ring entries to be freed. */
224 /* copy function */
225 void *(*memcpy_f)( void *, const void *, size_t );
226 /* This must be long for set_bit() */
227 long tx_full;
228 spinlock_t devlock;
229 };
230
231 /* I/O register access macros */
232
233 #define MEM lp->mem
234 #define DREG IO->data
235 #define AREG IO->addr
236 #define REGA(a) (*( AREG = (a), &DREG ))
237
238 /* Definitions for packet buffer access: */
239 #define PKT_BUF_SZ 1544
240 /* Get the address of a packet buffer corresponding to a given buffer head */
241 #define PKTBUF_ADDR(head) (((unsigned char *)(MEM)) + (head)->base)
242
243 /* Possible memory/IO addresses for probing */
244
245 static struct lance_addr {
246 unsigned long memaddr;
247 unsigned long ioaddr;
248 int slow_flag;
249 } lance_addr_list[] = {
250 { 0xfe010000, 0xfe00fff0, 0 }, /* RieblCard VME in TT */
251 { 0xffc10000, 0xffc0fff0, 0 }, /* RieblCard VME in MegaSTE
252 (highest byte stripped) */
253 { 0xffe00000, 0xffff7000, 1 }, /* RieblCard in ST
254 (highest byte stripped) */
255 { 0xffd00000, 0xffff7000, 1 }, /* RieblCard in ST with hw modif. to
256 avoid conflict with ROM
257 (highest byte stripped) */
258 { 0xffcf0000, 0xffcffff0, 0 }, /* PAMCard VME in TT and MSTE
259 (highest byte stripped) */
260 { 0xfecf0000, 0xfecffff0, 0 }, /* Rhotron's PAMCard VME in TT and MSTE
261 (highest byte stripped) */
262 };
263
264 #define N_LANCE_ADDR ARRAY_SIZE(lance_addr_list)
265
266
267 /* Definitions for the Lance */
268
269 /* tx_head flags */
270 #define TMD1_ENP 0x01 /* end of packet */
271 #define TMD1_STP 0x02 /* start of packet */
272 #define TMD1_DEF 0x04 /* deferred */
273 #define TMD1_ONE 0x08 /* one retry needed */
274 #define TMD1_MORE 0x10 /* more than one retry needed */
275 #define TMD1_ERR 0x40 /* error summary */
276 #define TMD1_OWN 0x80 /* ownership (set: chip owns) */
277
278 #define TMD1_OWN_CHIP TMD1_OWN
279 #define TMD1_OWN_HOST 0
280
281 /* tx_head misc field */
282 #define TMD3_TDR 0x03FF /* Time Domain Reflectometry counter */
283 #define TMD3_RTRY 0x0400 /* failed after 16 retries */
284 #define TMD3_LCAR 0x0800 /* carrier lost */
285 #define TMD3_LCOL 0x1000 /* late collision */
286 #define TMD3_UFLO 0x4000 /* underflow (late memory) */
287 #define TMD3_BUFF 0x8000 /* buffering error (no ENP) */
288
289 /* rx_head flags */
290 #define RMD1_ENP 0x01 /* end of packet */
291 #define RMD1_STP 0x02 /* start of packet */
292 #define RMD1_BUFF 0x04 /* buffer error */
293 #define RMD1_CRC 0x08 /* CRC error */
294 #define RMD1_OFLO 0x10 /* overflow */
295 #define RMD1_FRAM 0x20 /* framing error */
296 #define RMD1_ERR 0x40 /* error summary */
297 #define RMD1_OWN 0x80 /* ownership (set: ship owns) */
298
299 #define RMD1_OWN_CHIP RMD1_OWN
300 #define RMD1_OWN_HOST 0
301
302 /* register names */
303 #define CSR0 0 /* mode/status */
304 #define CSR1 1 /* init block addr (low) */
305 #define CSR2 2 /* init block addr (high) */
306 #define CSR3 3 /* misc */
307 #define CSR8 8 /* address filter */
308 #define CSR15 15 /* promiscuous mode */
309
310 /* CSR0 */
311 /* (R=readable, W=writeable, S=set on write, C=clear on write) */
312 #define CSR0_INIT 0x0001 /* initialize (RS) */
313 #define CSR0_STRT 0x0002 /* start (RS) */
314 #define CSR0_STOP 0x0004 /* stop (RS) */
315 #define CSR0_TDMD 0x0008 /* transmit demand (RS) */
316 #define CSR0_TXON 0x0010 /* transmitter on (R) */
317 #define CSR0_RXON 0x0020 /* receiver on (R) */
318 #define CSR0_INEA 0x0040 /* interrupt enable (RW) */
319 #define CSR0_INTR 0x0080 /* interrupt active (R) */
320 #define CSR0_IDON 0x0100 /* initialization done (RC) */
321 #define CSR0_TINT 0x0200 /* transmitter interrupt (RC) */
322 #define CSR0_RINT 0x0400 /* receiver interrupt (RC) */
323 #define CSR0_MERR 0x0800 /* memory error (RC) */
324 #define CSR0_MISS 0x1000 /* missed frame (RC) */
325 #define CSR0_CERR 0x2000 /* carrier error (no heartbeat :-) (RC) */
326 #define CSR0_BABL 0x4000 /* babble: tx-ed too many bits (RC) */
327 #define CSR0_ERR 0x8000 /* error (RC) */
328
329 /* CSR3 */
330 #define CSR3_BCON 0x0001 /* byte control */
331 #define CSR3_ACON 0x0002 /* ALE control */
332 #define CSR3_BSWP 0x0004 /* byte swap (1=big endian) */
333
334
335
336 /***************************** Prototypes *****************************/
337
338 static unsigned long lance_probe1( struct net_device *dev, struct lance_addr
339 *init_rec );
340 static int lance_open( struct net_device *dev );
341 static void lance_init_ring( struct net_device *dev );
342 static int lance_start_xmit( struct sk_buff *skb, struct net_device *dev );
343 static irqreturn_t lance_interrupt( int irq, void *dev_id );
344 static int lance_rx( struct net_device *dev );
345 static int lance_close( struct net_device *dev );
346 static void set_multicast_list( struct net_device *dev );
347 static int lance_set_mac_address( struct net_device *dev, void *addr );
348 static void lance_tx_timeout (struct net_device *dev);
349
350 /************************* End of Prototypes **************************/
351
352
353
354
355
356 static void *slow_memcpy( void *dst, const void *src, size_t len )
357
358 { char *cto = dst;
359 const char *cfrom = src;
360
361 while( len-- ) {
362 *cto++ = *cfrom++;
363 MFPDELAY();
364 }
365 return dst;
366 }
367
368
369 struct net_device * __init atarilance_probe(int unit)
370 {
371 int i;
372 static int found;
373 struct net_device *dev;
374 int err = -ENODEV;
375
376 if (!MACH_IS_ATARI || found)
377 /* Assume there's only one board possible... That seems true, since
378 * the Riebl/PAM board's address cannot be changed. */
379 return ERR_PTR(-ENODEV);
380
381 dev = alloc_etherdev(sizeof(struct lance_private));
382 if (!dev)
383 return ERR_PTR(-ENOMEM);
384 if (unit >= 0) {
385 sprintf(dev->name, "eth%d", unit);
386 netdev_boot_setup_check(dev);
387 }
388
389 for( i = 0; i < N_LANCE_ADDR; ++i ) {
390 if (lance_probe1( dev, &lance_addr_list[i] )) {
391 found = 1;
392 err = register_netdev(dev);
393 if (!err)
394 return dev;
395 free_irq(dev->irq, dev);
396 break;
397 }
398 }
399 free_netdev(dev);
400 return ERR_PTR(err);
401 }
402
403
404 /* Derived from hwreg_present() in atari/config.c: */
405
406 static noinline int __init addr_accessible(volatile void *regp, int wordflag,
407 int writeflag)
408 {
409 int ret;
410 unsigned long flags;
411 long *vbr, save_berr;
412
413 local_irq_save(flags);
414
415 __asm__ __volatile__ ( "movec %/vbr,%0" : "=r" (vbr) : );
416 save_berr = vbr[2];
417
418 __asm__ __volatile__
419 ( "movel %/sp,%/d1\n\t"
420 "movel #Lberr,%2@\n\t"
421 "moveq #0,%0\n\t"
422 "tstl %3\n\t"
423 "bne 1f\n\t"
424 "moveb %1@,%/d0\n\t"
425 "nop \n\t"
426 "bra 2f\n"
427 "1: movew %1@,%/d0\n\t"
428 "nop \n"
429 "2: tstl %4\n\t"
430 "beq 2f\n\t"
431 "tstl %3\n\t"
432 "bne 1f\n\t"
433 "clrb %1@\n\t"
434 "nop \n\t"
435 "moveb %/d0,%1@\n\t"
436 "nop \n\t"
437 "bra 2f\n"
438 "1: clrw %1@\n\t"
439 "nop \n\t"
440 "movew %/d0,%1@\n\t"
441 "nop \n"
442 "2: moveq #1,%0\n"
443 "Lberr: movel %/d1,%/sp"
444 : "=&d" (ret)
445 : "a" (regp), "a" (&vbr[2]), "rm" (wordflag), "rm" (writeflag)
446 : "d0", "d1", "memory"
447 );
448
449 vbr[2] = save_berr;
450 local_irq_restore(flags);
451
452 return ret;
453 }
454
455 static const struct net_device_ops lance_netdev_ops = {
456 .ndo_open = lance_open,
457 .ndo_stop = lance_close,
458 .ndo_start_xmit = lance_start_xmit,
459 .ndo_set_rx_mode = set_multicast_list,
460 .ndo_set_mac_address = lance_set_mac_address,
461 .ndo_tx_timeout = lance_tx_timeout,
462 .ndo_validate_addr = eth_validate_addr,
463 .ndo_change_mtu = eth_change_mtu,
464 };
465
466 static unsigned long __init lance_probe1( struct net_device *dev,
467 struct lance_addr *init_rec )
468 {
469 volatile unsigned short *memaddr =
470 (volatile unsigned short *)init_rec->memaddr;
471 volatile unsigned short *ioaddr =
472 (volatile unsigned short *)init_rec->ioaddr;
473 struct lance_private *lp;
474 struct lance_ioreg *IO;
475 int i;
476 static int did_version;
477 unsigned short save1, save2;
478
479 PROBE_PRINT(( "Probing for Lance card at mem %#lx io %#lx\n",
480 (long)memaddr, (long)ioaddr ));
481
482 /* Test whether memory readable and writable */
483 PROBE_PRINT(( "lance_probe1: testing memory to be accessible\n" ));
484 if (!addr_accessible( memaddr, 1, 1 )) goto probe_fail;
485
486 /* Written values should come back... */
487 PROBE_PRINT(( "lance_probe1: testing memory to be writable (1)\n" ));
488 save1 = *memaddr;
489 *memaddr = 0x0001;
490 if (*memaddr != 0x0001) goto probe_fail;
491 PROBE_PRINT(( "lance_probe1: testing memory to be writable (2)\n" ));
492 *memaddr = 0x0000;
493 if (*memaddr != 0x0000) goto probe_fail;
494 *memaddr = save1;
495
496 /* First port should be readable and writable */
497 PROBE_PRINT(( "lance_probe1: testing ioport to be accessible\n" ));
498 if (!addr_accessible( ioaddr, 1, 1 )) goto probe_fail;
499
500 /* and written values should be readable */
501 PROBE_PRINT(( "lance_probe1: testing ioport to be writeable\n" ));
502 save2 = ioaddr[1];
503 ioaddr[1] = 0x0001;
504 if (ioaddr[1] != 0x0001) goto probe_fail;
505
506 /* The CSR0_INIT bit should not be readable */
507 PROBE_PRINT(( "lance_probe1: testing CSR0 register function (1)\n" ));
508 save1 = ioaddr[0];
509 ioaddr[1] = CSR0;
510 ioaddr[0] = CSR0_INIT | CSR0_STOP;
511 if (ioaddr[0] != CSR0_STOP) {
512 ioaddr[0] = save1;
513 ioaddr[1] = save2;
514 goto probe_fail;
515 }
516 PROBE_PRINT(( "lance_probe1: testing CSR0 register function (2)\n" ));
517 ioaddr[0] = CSR0_STOP;
518 if (ioaddr[0] != CSR0_STOP) {
519 ioaddr[0] = save1;
520 ioaddr[1] = save2;
521 goto probe_fail;
522 }
523
524 /* Now ok... */
525 PROBE_PRINT(( "lance_probe1: Lance card detected\n" ));
526 goto probe_ok;
527
528 probe_fail:
529 return 0;
530
531 probe_ok:
532 lp = netdev_priv(dev);
533 MEM = (struct lance_memory *)memaddr;
534 IO = lp->iobase = (struct lance_ioreg *)ioaddr;
535 dev->base_addr = (unsigned long)ioaddr; /* informational only */
536 lp->memcpy_f = init_rec->slow_flag ? slow_memcpy : memcpy;
537
538 REGA( CSR0 ) = CSR0_STOP;
539
540 /* Now test for type: If the eeprom I/O port is readable, it is a
541 * PAM card */
542 if (addr_accessible( &(IO->eeprom), 0, 0 )) {
543 /* Switch back to Ram */
544 i = IO->mem;
545 lp->cardtype = PAM_CARD;
546 }
547 else if (*RIEBL_MAGIC_ADDR == RIEBL_MAGIC) {
548 lp->cardtype = NEW_RIEBL;
549 }
550 else
551 lp->cardtype = OLD_RIEBL;
552
553 if (lp->cardtype == PAM_CARD ||
554 memaddr == (unsigned short *)0xffe00000) {
555 /* PAMs card and Riebl on ST use level 5 autovector */
556 if (request_irq(IRQ_AUTO_5, lance_interrupt, IRQ_TYPE_PRIO,
557 "PAM,Riebl-ST Ethernet", dev)) {
558 printk( "Lance: request for irq %d failed\n", IRQ_AUTO_5 );
559 return 0;
560 }
561 dev->irq = (unsigned short)IRQ_AUTO_5;
562 }
563 else {
564 /* For VME-RieblCards, request a free VME int;
565 * (This must be unsigned long, since dev->irq is short and the
566 * IRQ_MACHSPEC bit would be cut off...)
567 */
568 unsigned long irq = atari_register_vme_int();
569 if (!irq) {
570 printk( "Lance: request for VME interrupt failed\n" );
571 return 0;
572 }
573 if (request_irq(irq, lance_interrupt, IRQ_TYPE_PRIO,
574 "Riebl-VME Ethernet", dev)) {
575 printk( "Lance: request for irq %ld failed\n", irq );
576 return 0;
577 }
578 dev->irq = irq;
579 }
580
581 printk("%s: %s at io %#lx, mem %#lx, irq %d%s, hwaddr ",
582 dev->name, lance_names[lp->cardtype],
583 (unsigned long)ioaddr,
584 (unsigned long)memaddr,
585 dev->irq,
586 init_rec->slow_flag ? " (slow memcpy)" : "" );
587
588 /* Get the ethernet address */
589 switch( lp->cardtype ) {
590 case OLD_RIEBL:
591 /* No ethernet address! (Set some default address) */
592 memcpy( dev->dev_addr, OldRieblDefHwaddr, 6 );
593 break;
594 case NEW_RIEBL:
595 lp->memcpy_f( dev->dev_addr, RIEBL_HWADDR_ADDR, 6 );
596 break;
597 case PAM_CARD:
598 i = IO->eeprom;
599 for( i = 0; i < 6; ++i )
600 dev->dev_addr[i] =
601 ((((unsigned short *)MEM)[i*2] & 0x0f) << 4) |
602 ((((unsigned short *)MEM)[i*2+1] & 0x0f));
603 i = IO->mem;
604 break;
605 }
606 printk("%pM\n", dev->dev_addr);
607 if (lp->cardtype == OLD_RIEBL) {
608 printk( "%s: Warning: This is a default ethernet address!\n",
609 dev->name );
610 printk( " Use \"ifconfig hw ether ...\" to set the address.\n" );
611 }
612
613 spin_lock_init(&lp->devlock);
614
615 MEM->init.mode = 0x0000; /* Disable Rx and Tx. */
616 for( i = 0; i < 6; i++ )
617 MEM->init.hwaddr[i] = dev->dev_addr[i^1]; /* <- 16 bit swap! */
618 MEM->init.filter[0] = 0x00000000;
619 MEM->init.filter[1] = 0x00000000;
620 MEM->init.rx_ring.adr_lo = offsetof( struct lance_memory, rx_head );
621 MEM->init.rx_ring.adr_hi = 0;
622 MEM->init.rx_ring.len = RX_RING_LEN_BITS;
623 MEM->init.tx_ring.adr_lo = offsetof( struct lance_memory, tx_head );
624 MEM->init.tx_ring.adr_hi = 0;
625 MEM->init.tx_ring.len = TX_RING_LEN_BITS;
626
627 if (lp->cardtype == PAM_CARD)
628 IO->ivec = IRQ_SOURCE_TO_VECTOR(dev->irq);
629 else
630 *RIEBL_IVEC_ADDR = IRQ_SOURCE_TO_VECTOR(dev->irq);
631
632 if (did_version++ == 0)
633 DPRINTK( 1, ( version ));
634
635 dev->netdev_ops = &lance_netdev_ops;
636
637 /* XXX MSch */
638 dev->watchdog_timeo = TX_TIMEOUT;
639
640 return 1;
641 }
642
643
644 static int lance_open( struct net_device *dev )
645 {
646 struct lance_private *lp = netdev_priv(dev);
647 struct lance_ioreg *IO = lp->iobase;
648 int i;
649
650 DPRINTK( 2, ( "%s: lance_open()\n", dev->name ));
651
652 lance_init_ring(dev);
653 /* Re-initialize the LANCE, and start it when done. */
654
655 REGA( CSR3 ) = CSR3_BSWP | (lp->cardtype == PAM_CARD ? CSR3_ACON : 0);
656 REGA( CSR2 ) = 0;
657 REGA( CSR1 ) = 0;
658 REGA( CSR0 ) = CSR0_INIT;
659 /* From now on, AREG is kept to point to CSR0 */
660
661 i = 1000000;
662 while (--i > 0)
663 if (DREG & CSR0_IDON)
664 break;
665 if (i <= 0 || (DREG & CSR0_ERR)) {
666 DPRINTK( 2, ( "lance_open(): opening %s failed, i=%d, csr0=%04x\n",
667 dev->name, i, DREG ));
668 DREG = CSR0_STOP;
669 return -EIO;
670 }
671 DREG = CSR0_IDON;
672 DREG = CSR0_STRT;
673 DREG = CSR0_INEA;
674
675 netif_start_queue (dev);
676
677 DPRINTK( 2, ( "%s: LANCE is open, csr0 %04x\n", dev->name, DREG ));
678
679 return 0;
680 }
681
682
683 /* Initialize the LANCE Rx and Tx rings. */
684
685 static void lance_init_ring( struct net_device *dev )
686 {
687 struct lance_private *lp = netdev_priv(dev);
688 int i;
689 unsigned offset;
690
691 lp->tx_full = 0;
692 lp->cur_rx = lp->cur_tx = 0;
693 lp->dirty_tx = 0;
694
695 offset = offsetof( struct lance_memory, packet_area );
696
697 /* If the packet buffer at offset 'o' would conflict with the reserved area
698 * of RieblCards, advance it */
699 #define CHECK_OFFSET(o) \
700 do { \
701 if (lp->cardtype == OLD_RIEBL || lp->cardtype == NEW_RIEBL) { \
702 if (((o) < RIEBL_RSVD_START) ? (o)+PKT_BUF_SZ > RIEBL_RSVD_START \
703 : (o) < RIEBL_RSVD_END) \
704 (o) = RIEBL_RSVD_END; \
705 } \
706 } while(0)
707
708 for( i = 0; i < TX_RING_SIZE; i++ ) {
709 CHECK_OFFSET(offset);
710 MEM->tx_head[i].base = offset;
711 MEM->tx_head[i].flag = TMD1_OWN_HOST;
712 MEM->tx_head[i].base_hi = 0;
713 MEM->tx_head[i].length = 0;
714 MEM->tx_head[i].misc = 0;
715 offset += PKT_BUF_SZ;
716 }
717
718 for( i = 0; i < RX_RING_SIZE; i++ ) {
719 CHECK_OFFSET(offset);
720 MEM->rx_head[i].base = offset;
721 MEM->rx_head[i].flag = TMD1_OWN_CHIP;
722 MEM->rx_head[i].base_hi = 0;
723 MEM->rx_head[i].buf_length = -PKT_BUF_SZ;
724 MEM->rx_head[i].msg_length = 0;
725 offset += PKT_BUF_SZ;
726 }
727 }
728
729
730 /* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX */
731
732
733 static void lance_tx_timeout (struct net_device *dev)
734 {
735 struct lance_private *lp = netdev_priv(dev);
736 struct lance_ioreg *IO = lp->iobase;
737
738 AREG = CSR0;
739 DPRINTK( 1, ( "%s: transmit timed out, status %04x, resetting.\n",
740 dev->name, DREG ));
741 DREG = CSR0_STOP;
742 /*
743 * Always set BSWP after a STOP as STOP puts it back into
744 * little endian mode.
745 */
746 REGA( CSR3 ) = CSR3_BSWP | (lp->cardtype == PAM_CARD ? CSR3_ACON : 0);
747 dev->stats.tx_errors++;
748 #ifndef final_version
749 { int i;
750 DPRINTK( 2, ( "Ring data: dirty_tx %d cur_tx %d%s cur_rx %d\n",
751 lp->dirty_tx, lp->cur_tx,
752 lp->tx_full ? " (full)" : "",
753 lp->cur_rx ));
754 for( i = 0 ; i < RX_RING_SIZE; i++ )
755 DPRINTK( 2, ( "rx #%d: base=%04x blen=%04x mlen=%04x\n",
756 i, MEM->rx_head[i].base,
757 -MEM->rx_head[i].buf_length,
758 MEM->rx_head[i].msg_length ));
759 for( i = 0 ; i < TX_RING_SIZE; i++ )
760 DPRINTK( 2, ( "tx #%d: base=%04x len=%04x misc=%04x\n",
761 i, MEM->tx_head[i].base,
762 -MEM->tx_head[i].length,
763 MEM->tx_head[i].misc ));
764 }
765 #endif
766 /* XXX MSch: maybe purge/reinit ring here */
767 /* lance_restart, essentially */
768 lance_init_ring(dev);
769 REGA( CSR0 ) = CSR0_INEA | CSR0_INIT | CSR0_STRT;
770 dev->trans_start = jiffies; /* prevent tx timeout */
771 netif_wake_queue(dev);
772 }
773
774 /* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX */
775
776 static int lance_start_xmit( struct sk_buff *skb, struct net_device *dev )
777 {
778 struct lance_private *lp = netdev_priv(dev);
779 struct lance_ioreg *IO = lp->iobase;
780 int entry, len;
781 struct lance_tx_head *head;
782 unsigned long flags;
783
784 DPRINTK( 2, ( "%s: lance_start_xmit() called, csr0 %4.4x.\n",
785 dev->name, DREG ));
786
787
788 /* The old LANCE chips doesn't automatically pad buffers to min. size. */
789 len = skb->len;
790 if (len < ETH_ZLEN)
791 len = ETH_ZLEN;
792 /* PAM-Card has a bug: Can only send packets with even number of bytes! */
793 else if (lp->cardtype == PAM_CARD && (len & 1))
794 ++len;
795
796 if (len > skb->len) {
797 if (skb_padto(skb, len))
798 return NETDEV_TX_OK;
799 }
800
801 netif_stop_queue (dev);
802
803 /* Fill in a Tx ring entry */
804 if (lance_debug >= 3) {
805 printk( "%s: TX pkt type 0x%04x from %pM to %pM"
806 " data at 0x%08x len %d\n",
807 dev->name, ((u_short *)skb->data)[6],
808 &skb->data[6], skb->data,
809 (int)skb->data, (int)skb->len );
810 }
811
812 /* We're not prepared for the int until the last flags are set/reset. And
813 * the int may happen already after setting the OWN_CHIP... */
814 spin_lock_irqsave (&lp->devlock, flags);
815
816 /* Mask to ring buffer boundary. */
817 entry = lp->cur_tx & TX_RING_MOD_MASK;
818 head = &(MEM->tx_head[entry]);
819
820 /* Caution: the write order is important here, set the "ownership" bits
821 * last.
822 */
823
824
825 head->length = -len;
826 head->misc = 0;
827 lp->memcpy_f( PKTBUF_ADDR(head), (void *)skb->data, skb->len );
828 head->flag = TMD1_OWN_CHIP | TMD1_ENP | TMD1_STP;
829 dev->stats.tx_bytes += skb->len;
830 dev_kfree_skb( skb );
831 lp->cur_tx++;
832 while( lp->cur_tx >= TX_RING_SIZE && lp->dirty_tx >= TX_RING_SIZE ) {
833 lp->cur_tx -= TX_RING_SIZE;
834 lp->dirty_tx -= TX_RING_SIZE;
835 }
836
837 /* Trigger an immediate send poll. */
838 DREG = CSR0_INEA | CSR0_TDMD;
839
840 if ((MEM->tx_head[(entry+1) & TX_RING_MOD_MASK].flag & TMD1_OWN) ==
841 TMD1_OWN_HOST)
842 netif_start_queue (dev);
843 else
844 lp->tx_full = 1;
845 spin_unlock_irqrestore (&lp->devlock, flags);
846
847 return NETDEV_TX_OK;
848 }
849
850 /* The LANCE interrupt handler. */
851
852 static irqreturn_t lance_interrupt( int irq, void *dev_id )
853 {
854 struct net_device *dev = dev_id;
855 struct lance_private *lp;
856 struct lance_ioreg *IO;
857 int csr0, boguscnt = 10;
858 int handled = 0;
859
860 if (dev == NULL) {
861 DPRINTK( 1, ( "lance_interrupt(): interrupt for unknown device.\n" ));
862 return IRQ_NONE;
863 }
864
865 lp = netdev_priv(dev);
866 IO = lp->iobase;
867 spin_lock (&lp->devlock);
868
869 AREG = CSR0;
870
871 while( ((csr0 = DREG) & (CSR0_ERR | CSR0_TINT | CSR0_RINT)) &&
872 --boguscnt >= 0) {
873 handled = 1;
874 /* Acknowledge all of the current interrupt sources ASAP. */
875 DREG = csr0 & ~(CSR0_INIT | CSR0_STRT | CSR0_STOP |
876 CSR0_TDMD | CSR0_INEA);
877
878 DPRINTK( 2, ( "%s: interrupt csr0=%04x new csr=%04x.\n",
879 dev->name, csr0, DREG ));
880
881 if (csr0 & CSR0_RINT) /* Rx interrupt */
882 lance_rx( dev );
883
884 if (csr0 & CSR0_TINT) { /* Tx-done interrupt */
885 int dirty_tx = lp->dirty_tx;
886
887 while( dirty_tx < lp->cur_tx) {
888 int entry = dirty_tx & TX_RING_MOD_MASK;
889 int status = MEM->tx_head[entry].flag;
890
891 if (status & TMD1_OWN_CHIP)
892 break; /* It still hasn't been Txed */
893
894 MEM->tx_head[entry].flag = 0;
895
896 if (status & TMD1_ERR) {
897 /* There was an major error, log it. */
898 int err_status = MEM->tx_head[entry].misc;
899 dev->stats.tx_errors++;
900 if (err_status & TMD3_RTRY) dev->stats.tx_aborted_errors++;
901 if (err_status & TMD3_LCAR) dev->stats.tx_carrier_errors++;
902 if (err_status & TMD3_LCOL) dev->stats.tx_window_errors++;
903 if (err_status & TMD3_UFLO) {
904 /* Ackk! On FIFO errors the Tx unit is turned off! */
905 dev->stats.tx_fifo_errors++;
906 /* Remove this verbosity later! */
907 DPRINTK( 1, ( "%s: Tx FIFO error! Status %04x\n",
908 dev->name, csr0 ));
909 /* Restart the chip. */
910 DREG = CSR0_STRT;
911 }
912 } else {
913 if (status & (TMD1_MORE | TMD1_ONE | TMD1_DEF))
914 dev->stats.collisions++;
915 dev->stats.tx_packets++;
916 }
917
918 /* XXX MSch: free skb?? */
919 dirty_tx++;
920 }
921
922 #ifndef final_version
923 if (lp->cur_tx - dirty_tx >= TX_RING_SIZE) {
924 DPRINTK( 0, ( "out-of-sync dirty pointer,"
925 " %d vs. %d, full=%ld.\n",
926 dirty_tx, lp->cur_tx, lp->tx_full ));
927 dirty_tx += TX_RING_SIZE;
928 }
929 #endif
930
931 if (lp->tx_full && (netif_queue_stopped(dev)) &&
932 dirty_tx > lp->cur_tx - TX_RING_SIZE + 2) {
933 /* The ring is no longer full, clear tbusy. */
934 lp->tx_full = 0;
935 netif_wake_queue (dev);
936 }
937
938 lp->dirty_tx = dirty_tx;
939 }
940
941 /* Log misc errors. */
942 if (csr0 & CSR0_BABL) dev->stats.tx_errors++; /* Tx babble. */
943 if (csr0 & CSR0_MISS) dev->stats.rx_errors++; /* Missed a Rx frame. */
944 if (csr0 & CSR0_MERR) {
945 DPRINTK( 1, ( "%s: Bus master arbitration failure (?!?), "
946 "status %04x.\n", dev->name, csr0 ));
947 /* Restart the chip. */
948 DREG = CSR0_STRT;
949 }
950 }
951
952 /* Clear any other interrupt, and set interrupt enable. */
953 DREG = CSR0_BABL | CSR0_CERR | CSR0_MISS | CSR0_MERR |
954 CSR0_IDON | CSR0_INEA;
955
956 DPRINTK( 2, ( "%s: exiting interrupt, csr0=%#04x.\n",
957 dev->name, DREG ));
958
959 spin_unlock (&lp->devlock);
960 return IRQ_RETVAL(handled);
961 }
962
963
964 static int lance_rx( struct net_device *dev )
965 {
966 struct lance_private *lp = netdev_priv(dev);
967 int entry = lp->cur_rx & RX_RING_MOD_MASK;
968 int i;
969
970 DPRINTK( 2, ( "%s: rx int, flag=%04x\n", dev->name,
971 MEM->rx_head[entry].flag ));
972
973 /* If we own the next entry, it's a new packet. Send it up. */
974 while( (MEM->rx_head[entry].flag & RMD1_OWN) == RMD1_OWN_HOST ) {
975 struct lance_rx_head *head = &(MEM->rx_head[entry]);
976 int status = head->flag;
977
978 if (status != (RMD1_ENP|RMD1_STP)) { /* There was an error. */
979 /* There is a tricky error noted by John Murphy,
980 <murf@perftech.com> to Russ Nelson: Even with full-sized
981 buffers it's possible for a jabber packet to use two
982 buffers, with only the last correctly noting the error. */
983 if (status & RMD1_ENP) /* Only count a general error at the */
984 dev->stats.rx_errors++; /* end of a packet.*/
985 if (status & RMD1_FRAM) dev->stats.rx_frame_errors++;
986 if (status & RMD1_OFLO) dev->stats.rx_over_errors++;
987 if (status & RMD1_CRC) dev->stats.rx_crc_errors++;
988 if (status & RMD1_BUFF) dev->stats.rx_fifo_errors++;
989 head->flag &= (RMD1_ENP|RMD1_STP);
990 } else {
991 /* Malloc up new buffer, compatible with net-3. */
992 short pkt_len = head->msg_length & 0xfff;
993 struct sk_buff *skb;
994
995 if (pkt_len < 60) {
996 printk( "%s: Runt packet!\n", dev->name );
997 dev->stats.rx_errors++;
998 }
999 else {
1000 skb = dev_alloc_skb( pkt_len+2 );
1001 if (skb == NULL) {
1002 DPRINTK( 1, ( "%s: Memory squeeze, deferring packet.\n",
1003 dev->name ));
1004 for( i = 0; i < RX_RING_SIZE; i++ )
1005 if (MEM->rx_head[(entry+i) & RX_RING_MOD_MASK].flag &
1006 RMD1_OWN_CHIP)
1007 break;
1008
1009 if (i > RX_RING_SIZE - 2) {
1010 dev->stats.rx_dropped++;
1011 head->flag |= RMD1_OWN_CHIP;
1012 lp->cur_rx++;
1013 }
1014 break;
1015 }
1016
1017 if (lance_debug >= 3) {
1018 u_char *data = PKTBUF_ADDR(head);
1019
1020 printk(KERN_DEBUG "%s: RX pkt type 0x%04x from %pM to %pM "
1021 "data %02x %02x %02x %02x %02x %02x %02x %02x "
1022 "len %d\n",
1023 dev->name, ((u_short *)data)[6],
1024 &data[6], data,
1025 data[15], data[16], data[17], data[18],
1026 data[19], data[20], data[21], data[22],
1027 pkt_len);
1028 }
1029
1030 skb_reserve( skb, 2 ); /* 16 byte align */
1031 skb_put( skb, pkt_len ); /* Make room */
1032 lp->memcpy_f( skb->data, PKTBUF_ADDR(head), pkt_len );
1033 skb->protocol = eth_type_trans( skb, dev );
1034 netif_rx( skb );
1035 dev->stats.rx_packets++;
1036 dev->stats.rx_bytes += pkt_len;
1037 }
1038 }
1039
1040 head->flag |= RMD1_OWN_CHIP;
1041 entry = (++lp->cur_rx) & RX_RING_MOD_MASK;
1042 }
1043 lp->cur_rx &= RX_RING_MOD_MASK;
1044
1045 /* From lance.c (Donald Becker): */
1046 /* We should check that at least two ring entries are free. If not,
1047 we should free one and mark stats->rx_dropped++. */
1048
1049 return 0;
1050 }
1051
1052
1053 static int lance_close( struct net_device *dev )
1054 {
1055 struct lance_private *lp = netdev_priv(dev);
1056 struct lance_ioreg *IO = lp->iobase;
1057
1058 netif_stop_queue (dev);
1059
1060 AREG = CSR0;
1061
1062 DPRINTK( 2, ( "%s: Shutting down ethercard, status was %2.2x.\n",
1063 dev->name, DREG ));
1064
1065 /* We stop the LANCE here -- it occasionally polls
1066 memory if we don't. */
1067 DREG = CSR0_STOP;
1068
1069 return 0;
1070 }
1071
1072
1073 /* Set or clear the multicast filter for this adaptor.
1074 num_addrs == -1 Promiscuous mode, receive all packets
1075 num_addrs == 0 Normal mode, clear multicast list
1076 num_addrs > 0 Multicast mode, receive normal and MC packets, and do
1077 best-effort filtering.
1078 */
1079
1080 static void set_multicast_list( struct net_device *dev )
1081 {
1082 struct lance_private *lp = netdev_priv(dev);
1083 struct lance_ioreg *IO = lp->iobase;
1084
1085 if (netif_running(dev))
1086 /* Only possible if board is already started */
1087 return;
1088
1089 /* We take the simple way out and always enable promiscuous mode. */
1090 DREG = CSR0_STOP; /* Temporarily stop the lance. */
1091
1092 if (dev->flags & IFF_PROMISC) {
1093 /* Log any net taps. */
1094 DPRINTK( 2, ( "%s: Promiscuous mode enabled.\n", dev->name ));
1095 REGA( CSR15 ) = 0x8000; /* Set promiscuous mode */
1096 } else {
1097 short multicast_table[4];
1098 int num_addrs = netdev_mc_count(dev);
1099 int i;
1100 /* We don't use the multicast table, but rely on upper-layer
1101 * filtering. */
1102 memset( multicast_table, (num_addrs == 0) ? 0 : -1,
1103 sizeof(multicast_table) );
1104 for( i = 0; i < 4; i++ )
1105 REGA( CSR8+i ) = multicast_table[i];
1106 REGA( CSR15 ) = 0; /* Unset promiscuous mode */
1107 }
1108
1109 /*
1110 * Always set BSWP after a STOP as STOP puts it back into
1111 * little endian mode.
1112 */
1113 REGA( CSR3 ) = CSR3_BSWP | (lp->cardtype == PAM_CARD ? CSR3_ACON : 0);
1114
1115 /* Resume normal operation and reset AREG to CSR0 */
1116 REGA( CSR0 ) = CSR0_IDON | CSR0_INEA | CSR0_STRT;
1117 }
1118
1119
1120 /* This is needed for old RieblCards and possible for new RieblCards */
1121
1122 static int lance_set_mac_address( struct net_device *dev, void *addr )
1123 {
1124 struct lance_private *lp = netdev_priv(dev);
1125 struct sockaddr *saddr = addr;
1126 int i;
1127
1128 if (lp->cardtype != OLD_RIEBL && lp->cardtype != NEW_RIEBL)
1129 return -EOPNOTSUPP;
1130
1131 if (netif_running(dev)) {
1132 /* Only possible while card isn't started */
1133 DPRINTK( 1, ( "%s: hwaddr can be set only while card isn't open.\n",
1134 dev->name ));
1135 return -EIO;
1136 }
1137
1138 memcpy( dev->dev_addr, saddr->sa_data, dev->addr_len );
1139 for( i = 0; i < 6; i++ )
1140 MEM->init.hwaddr[i] = dev->dev_addr[i^1]; /* <- 16 bit swap! */
1141 lp->memcpy_f( RIEBL_HWADDR_ADDR, dev->dev_addr, 6 );
1142 /* set also the magic for future sessions */
1143 *RIEBL_MAGIC_ADDR = RIEBL_MAGIC;
1144
1145 return 0;
1146 }
1147
1148
1149 #ifdef MODULE
1150 static struct net_device *atarilance_dev;
1151
1152 static int __init atarilance_module_init(void)
1153 {
1154 atarilance_dev = atarilance_probe(-1);
1155 if (IS_ERR(atarilance_dev))
1156 return PTR_ERR(atarilance_dev);
1157 return 0;
1158 }
1159
1160 static void __exit atarilance_module_exit(void)
1161 {
1162 unregister_netdev(atarilance_dev);
1163 free_irq(atarilance_dev->irq, atarilance_dev);
1164 free_netdev(atarilance_dev);
1165 }
1166 module_init(atarilance_module_init);
1167 module_exit(atarilance_module_exit);
1168 #endif /* MODULE */
1169
1170
1171 /*
1172 * Local variables:
1173 * c-indent-level: 4
1174 * tab-width: 4
1175 * End:
1176 */