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libata: honour host controllers that want just one host
[linux-2.6-block.git] / drivers / net / ibmlana.c
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d7fbeba6 1/*
1da177e4
LT		 2net-3-driver for the IBM LAN Adapter/A
3
4This is an extension to the Linux operating system, and is covered by the
5same GNU General Public License that covers that work.
6
7Copyright 1999 by Alfred Arnold (alfred@ccac.rwth-aachen.de,
8 alfred.arnold@lancom.de)
9
10This driver is based both on the SK_MCA driver, which is itself based on the
11SK_G16 and 3C523 driver.
12
13paper sources:
d7fbeba6 14 'PC Hardware: Aufbau, Funktionsweise, Programmierung' by
1da177e4 15 Hans-Peter Messmer for the basic Microchannel stuff
d7fbeba6 16
1da177e4
LT		 17 'Linux Geraetetreiber' by Allesandro Rubini, Kalle Dalheimer
18 for help on Ethernet driver programming
19
20 'DP83934CVUL-20/25 MHz SONIC-T Ethernet Controller Datasheet' by National
21 Semiconductor for info on the MAC chip
22
23 'LAN Technical Reference Ethernet Adapter Interface Version 1 Release 1.0
24 Document Number SC30-3661-00' by IBM for info on the adapter itself
25
26 Also see http://www.natsemi.com/
27
28special acknowledgements to:
29 - Bob Eager for helping me out with documentation from IBM
d7fbeba6 30 - Jim Shorney for his endless patience with me while I was using
1da177e4
LT		 31 him as a beta tester to trace down the address filter bug ;-)
32
33 Missing things:
34
35 -> set debug level via ioctl instead of compile-time switches
36 -> I didn't follow the development of the 2.1.x kernels, so my
d7fbeba6 37 assumptions about which things changed with which kernel version
1da177e4
LT		 38 are probably nonsense
39
40History:
41 Nov 6th, 1999
42 startup from SK_MCA driver
43 Dec 6th, 1999
44 finally got docs about the card. A big thank you to Bob Eager!
45 Dec 12th, 1999
46 first packet received
47 Dec 13th, 1999
48 recv queue done, tcpdump works
49 Dec 15th, 1999
50 transmission part works
51 Dec 28th, 1999
52 added usage of the isa_functions for Linux 2.3 . Things should
53 still work with 2.0.x....
54 Jan 28th, 2000
55 in Linux 2.2.13, the version.h file mysteriously didn't get
56 included. Added a workaround for this. Futhermore, it now
57 not only compiles as a modules ;-)
58 Jan 30th, 2000
59 newer kernels automatically probe more than one board, so the
60 'startslot' as a variable is also needed here
61 Apr 12th, 2000
62 the interrupt mask register is not set 'hard' instead of individually
63 setting registers, since this seems to set bits that shouldn't be
64 set
65 May 21st, 2000
66 reset interrupt status immediately after CAM load
67 add a recovery delay after releasing the chip's reset line
68 May 24th, 2000
69 finally found the bug in the address filter setup - damned signed
70 chars!
71 June 1st, 2000
72 corrected version codes, added support for the latest 2.3 changes
73 Oct 28th, 2002
74 cleaned up for the 2.5 tree <alan@redhat.com>
75
76 *************************************************************************/
77
78#include <linux/kernel.h>
79#include <linux/string.h>
80#include <linux/errno.h>
81#include <linux/ioport.h>
82#include <linux/slab.h>
83#include <linux/interrupt.h>
84#include <linux/delay.h>
85#include <linux/time.h>
86#include <linux/mca-legacy.h>
87#include <linux/module.h>
88#include <linux/netdevice.h>
89#include <linux/etherdevice.h>
90#include <linux/skbuff.h>
91#include <linux/bitops.h>
92
93#include <asm/processor.h>
94#include <asm/io.h>
95
96#define _IBM_LANA_DRIVER_
97#include "ibmlana.h"
98
99#undef DEBUG
100
101#define DRV_NAME "ibmlana"
102
103/* ------------------------------------------------------------------------
104 * global static data - not more since we can handle multiple boards and
105 * have to pack all state info into the device struct!
106 * ------------------------------------------------------------------------ */
107
108static char *MediaNames[Media_Count] = {
109 "10BaseT", "10Base5", "Unknown", "10Base2"
110};
111
112/* ------------------------------------------------------------------------
113 * private subfunctions
114 * ------------------------------------------------------------------------ */
115
116#ifdef DEBUG
117 /* dump all registers */
118
119static void dumpregs(struct net_device *dev)
120{
121 int z;
122
123 for (z = 0; z < 160; z += 2) {
124 if (!(z & 15))
125 printk("REGS: %04x:", z);
126 printk(" %04x", inw(dev->base_addr + z));
127 if ((z & 15) == 14)
128 printk("\n");
129 }
130}
131
132/* dump parts of shared memory - only needed during debugging */
133
134static void dumpmem(struct net_device *dev, u32 start, u32 len)
135{
136 ibmlana_priv *priv = netdev_priv(dev);
137 int z;
138
139 printk("Address %04x:\n", start);
140 for (z = 0; z < len; z++) {
141 if ((z & 15) == 0)
142 printk("%04x:", z);
143 printk(" %02x", readb(priv->base + start + z));
144 if ((z & 15) == 15)
145 printk("\n");
146 }
147 if ((z & 15) != 0)
148 printk("\n");
149}
150
151/* print exact time - ditto */
152
153static void PrTime(void)
154{
155 struct timeval tv;
156
157 do_gettimeofday(&tv);
158 printk("%9d:%06d: ", (int) tv.tv_sec, (int) tv.tv_usec);
159}
160#endif /* DEBUG */
161
162/* deduce resources out of POS registers */
163
164static void getaddrs(int slot, int *base, int *memlen, int *iobase,
165 int *irq, ibmlana_medium * medium)
166{
167 u_char pos0, pos1;
168
169 pos0 = mca_read_stored_pos(slot, 2);
170 pos1 = mca_read_stored_pos(slot, 3);
171
172 *base = 0xc0000 + ((pos1 & 0xf0) << 9);
173 *memlen = (pos1 & 0x01) ? 0x8000 : 0x4000;
174 *iobase = (pos0 & 0xe0) << 7;
175 switch (pos0 & 0x06) {
176 case 0:
177 *irq = 5;
178 break;
179 case 2:
180 *irq = 15;
181 break;
182 case 4:
183 *irq = 10;
184 break;
185 case 6:
186 *irq = 11;
187 break;
188 }
189 *medium = (pos0 & 0x18) >> 3;
190}
191
192/* wait on register value with mask and timeout */
193
194static int wait_timeout(struct net_device *dev, int regoffs, u16 mask,
195 u16 value, int timeout)
196{
197 unsigned long fin = jiffies + timeout;
198
199 while (time_before(jiffies,fin))
200 if ((inw(dev->base_addr + regoffs) & mask) == value)
201 return 1;
202
203 return 0;
204}
205
206
207/* reset the whole board */
208
209static void ResetBoard(struct net_device *dev)
210{
211 unsigned char bcmval;
212
213 /* read original board control value */
214
215 bcmval = inb(dev->base_addr + BCMREG);
216
217 /* set reset bit for a while */
218
219 bcmval |= BCMREG_RESET;
220 outb(bcmval, dev->base_addr + BCMREG);
221 udelay(10);
222 bcmval &= ~BCMREG_RESET;
223 outb(bcmval, dev->base_addr + BCMREG);
224
225 /* switch over to RAM again */
226
227 bcmval |= BCMREG_RAMEN | BCMREG_RAMWIN;
228 outb(bcmval, dev->base_addr + BCMREG);
229}
230
231/* calculate RAM layout & set up descriptors in RAM */
232
233static void InitDscrs(struct net_device *dev)
234{
235 ibmlana_priv *priv = netdev_priv(dev);
236 u32 addr, baddr, raddr;
237 int z;
238 tda_t tda;
239 rda_t rda;
240 rra_t rra;
241
242 /* initialize RAM */
243
244 memset_io(priv->base, 0xaa,
245 dev->mem_start - dev->mem_start); /* XXX: typo? */
246
247 /* setup n TX descriptors - independent of RAM size */
248
249 priv->tdastart = addr = 0;
250 priv->txbufstart = baddr = sizeof(tda_t) * TXBUFCNT;
251 for (z = 0; z < TXBUFCNT; z++) {
252 tda.status = 0;
253 tda.config = 0;
254 tda.length = 0;
255 tda.fragcount = 1;
256 tda.startlo = baddr;
257 tda.starthi = 0;
258 tda.fraglength = 0;
259 if (z == TXBUFCNT - 1)
260 tda.link = priv->tdastart;
261 else
262 tda.link = addr + sizeof(tda_t);
263 tda.link |= 1;
264 memcpy_toio(priv->base + addr, &tda, sizeof(tda_t));
265 addr += sizeof(tda_t);
266 baddr += PKTSIZE;
267 }
268
269 /* calculate how many receive buffers fit into remaining memory */
270
271 priv->rxbufcnt = (dev->mem_end - dev->mem_start - baddr) / (sizeof(rra_t) + sizeof(rda_t) + PKTSIZE);
272
273 /* calculate receive addresses */
274
275 priv->rrastart = raddr = priv->txbufstart + (TXBUFCNT * PKTSIZE);
276 priv->rdastart = addr = priv->rrastart + (priv->rxbufcnt * sizeof(rra_t));
277 priv->rxbufstart = baddr = priv->rdastart + (priv->rxbufcnt * sizeof(rda_t));
d7fbeba6 278
1da177e4
LT		 279 for (z = 0; z < priv->rxbufcnt; z++) {
280 rra.startlo = baddr;
281 rra.starthi = 0;
282 rra.cntlo = PKTSIZE >> 1;
283 rra.cnthi = 0;
284 memcpy_toio(priv->base + raddr, &rra, sizeof(rra_t));
285
286 rda.status = 0;
287 rda.length = 0;
288 rda.startlo = 0;
289 rda.starthi = 0;
290 rda.seqno = 0;
291 if (z < priv->rxbufcnt - 1)
292 rda.link = addr + sizeof(rda_t);
293 else
294 rda.link = 1;
295 rda.inuse = 1;
296 memcpy_toio(priv->base + addr, &rda, sizeof(rda_t));
297
298 baddr += PKTSIZE;
299 raddr += sizeof(rra_t);
300 addr += sizeof(rda_t);
301 }
302
303 /* initialize current pointers */
304
305 priv->nextrxdescr = 0;
306 priv->lastrxdescr = priv->rxbufcnt - 1;
307 priv->nexttxdescr = 0;
308 priv->currtxdescr = 0;
309 priv->txusedcnt = 0;
310 memset(priv->txused, 0, sizeof(priv->txused));
311}
312
313/* set up Rx + Tx descriptors in SONIC */
314
315static int InitSONIC(struct net_device *dev)
316{
317 ibmlana_priv *priv = netdev_priv(dev);
318
319 /* set up start & end of resource area */
320
321 outw(0, SONIC_URRA);
322 outw(priv->rrastart, dev->base_addr + SONIC_RSA);
323 outw(priv->rrastart + (priv->rxbufcnt * sizeof(rra_t)), dev->base_addr + SONIC_REA);
324 outw(priv->rrastart, dev->base_addr + SONIC_RRP);
325 outw(priv->rrastart, dev->base_addr + SONIC_RWP);
326
327 /* set EOBC so that only one packet goes into one buffer */
328
329 outw((PKTSIZE - 4) >> 1, dev->base_addr + SONIC_EOBC);
330
331 /* let SONIC read the first RRA descriptor */
332
333 outw(CMDREG_RRRA, dev->base_addr + SONIC_CMDREG);
334 if (!wait_timeout(dev, SONIC_CMDREG, CMDREG_RRRA, 0, 2)) {
335 printk(KERN_ERR "%s: SONIC did not respond on RRRA command - giving up.", dev->name);
336 return 0;
337 }
338
339 /* point SONIC to the first RDA */
340
341 outw(0, dev->base_addr + SONIC_URDA);
342 outw(priv->rdastart, dev->base_addr + SONIC_CRDA);
343
344 /* set upper half of TDA address */
345
346 outw(0, dev->base_addr + SONIC_UTDA);
347
348 return 1;
349}
350
351/* stop SONIC so we can reinitialize it */
352
353static void StopSONIC(struct net_device *dev)
354{
355 /* disable interrupts */
356
357 outb(inb(dev->base_addr + BCMREG) & (~BCMREG_IEN), dev->base_addr + BCMREG);
358 outb(0, dev->base_addr + SONIC_IMREG);
359
360 /* reset the SONIC */
361
362 outw(CMDREG_RST, dev->base_addr + SONIC_CMDREG);
363 udelay(10);
364 outw(CMDREG_RST, dev->base_addr + SONIC_CMDREG);
365}
366
367/* initialize card and SONIC for proper operation */
368
369static void putcam(camentry_t * cams, int *camcnt, char *addr)
370{
371 camentry_t *pcam = cams + (*camcnt);
372 u8 *uaddr = (u8 *) addr;
373
374 pcam->index = *camcnt;
375 pcam->addr0 = (((u16) uaddr[1]) << 8) | uaddr[0];
376 pcam->addr1 = (((u16) uaddr[3]) << 8) | uaddr[2];
377 pcam->addr2 = (((u16) uaddr[5]) << 8) | uaddr[4];
378 (*camcnt)++;
379}
380
381static void InitBoard(struct net_device *dev)
382{
383 ibmlana_priv *priv = netdev_priv(dev);
384 int camcnt;
385 camentry_t cams[16];
386 u32 cammask;
387 struct dev_mc_list *mcptr;
388 u16 rcrval;
389
390 /* reset the SONIC */
391
392 outw(CMDREG_RST, dev->base_addr + SONIC_CMDREG);
393 udelay(10);
394
395 /* clear all spurious interrupts */
396
397 outw(inw(dev->base_addr + SONIC_ISREG), dev->base_addr + SONIC_ISREG);
398
399 /* set up the SONIC's bus interface - constant for this adapter -
400 must be done while the SONIC is in reset */
401
402 outw(DCREG_USR1 | DCREG_USR0 | DCREG_WC1 | DCREG_DW32, dev->base_addr + SONIC_DCREG);
403 outw(0, dev->base_addr + SONIC_DCREG2);
404
405 /* remove reset form the SONIC */
406
407 outw(0, dev->base_addr + SONIC_CMDREG);
408 udelay(10);
409
410 /* data sheet requires URRA to be programmed before setting up the CAM contents */
411
412 outw(0, dev->base_addr + SONIC_URRA);
413
414 /* program the CAM entry 0 to the device address */
415
416 camcnt = 0;
417 putcam(cams, &camcnt, dev->dev_addr);
418
419 /* start putting the multicast addresses into the CAM list. Stop if
420 it is full. */
421
422 for (mcptr = dev->mc_list; mcptr != NULL; mcptr = mcptr->next) {
423 putcam(cams, &camcnt, mcptr->dmi_addr);
424 if (camcnt == 16)
425 break;
426 }
427
428 /* calculate CAM mask */
429
430 cammask = (1 << camcnt) - 1;
431
432 /* feed CDA into SONIC, initialize RCR value (always get broadcasts) */
433
434 memcpy_toio(priv->base, cams, sizeof(camentry_t) * camcnt);
435 memcpy_toio(priv->base + (sizeof(camentry_t) * camcnt), &cammask, sizeof(cammask));
436
437#ifdef DEBUG
438 printk("CAM setup:\n");
439 dumpmem(dev, 0, sizeof(camentry_t) * camcnt + sizeof(cammask));
440#endif
441
442 outw(0, dev->base_addr + SONIC_CAMPTR);
443 outw(camcnt, dev->base_addr + SONIC_CAMCNT);
444 outw(CMDREG_LCAM, dev->base_addr + SONIC_CMDREG);
445 if (!wait_timeout(dev, SONIC_CMDREG, CMDREG_LCAM, 0, 2)) {
446 printk(KERN_ERR "%s:SONIC did not respond on LCAM command - giving up.", dev->name);
447 return;
448 } else {
449 /* clear interrupt condition */
450
451 outw(ISREG_LCD, dev->base_addr + SONIC_ISREG);
452
453#ifdef DEBUG
454 printk("Loading CAM done, address pointers %04x:%04x\n",
455 inw(dev->base_addr + SONIC_URRA),
456 inw(dev->base_addr + SONIC_CAMPTR));
457 {
458 int z;
459
460 printk("\n-->CAM: PTR %04x CNT %04x\n",
461 inw(dev->base_addr + SONIC_CAMPTR),
462 inw(dev->base_addr + SONIC_CAMCNT));
463 outw(CMDREG_RST, dev->base_addr + SONIC_CMDREG);
464 for (z = 0; z < camcnt; z++) {
465 outw(z, dev->base_addr + SONIC_CAMEPTR);
466 printk("Entry %d: %04x %04x %04x\n", z,
467 inw(dev->base_addr + SONIC_CAMADDR0),
468 inw(dev->base_addr + SONIC_CAMADDR1),
469 inw(dev->base_addr + SONIC_CAMADDR2));
470 }
471 outw(0, dev->base_addr + SONIC_CMDREG);
472 }
473#endif
474 }
475
476 rcrval = RCREG_BRD | RCREG_LB_NONE;
477
478 /* if still multicast addresses left or ALLMULTI is set, set the multicast
479 enable bit */
480
481 if ((dev->flags & IFF_ALLMULTI) || (mcptr != NULL))
482 rcrval |= RCREG_AMC;
483
484 /* promiscous mode ? */
485
486 if (dev->flags & IFF_PROMISC)
487 rcrval |= RCREG_PRO;
488
489 /* program receive mode */
490
491 outw(rcrval, dev->base_addr + SONIC_RCREG);
492#ifdef DEBUG
493 printk("\nRCRVAL: %04x\n", rcrval);
494#endif
495
496 /* set up descriptors in shared memory + feed them into SONIC registers */
497
498 InitDscrs(dev);
499 if (!InitSONIC(dev))
500 return;
501
502 /* reset all pending interrupts */
503
504 outw(0xffff, dev->base_addr + SONIC_ISREG);
505
506 /* enable transmitter + receiver interrupts */
507
508 outw(CMDREG_RXEN, dev->base_addr + SONIC_CMDREG);
509 outw(IMREG_PRXEN | IMREG_RBEEN | IMREG_PTXEN | IMREG_TXEREN, dev->base_addr + SONIC_IMREG);
510
511 /* turn on card interrupts */
512
513 outb(inb(dev->base_addr + BCMREG) | BCMREG_IEN, dev->base_addr + BCMREG);
514
515#ifdef DEBUG
516 printk("Register dump after initialization:\n");
517 dumpregs(dev);
518#endif
519}
520
521/* start transmission of a descriptor */
522
523static void StartTx(struct net_device *dev, int descr)
524{
525 ibmlana_priv *priv = netdev_priv(dev);
526 int addr;
527
528 addr = priv->tdastart + (descr * sizeof(tda_t));
529
530 /* put descriptor address into SONIC */
531
532 outw(addr, dev->base_addr + SONIC_CTDA);
533
534 /* trigger transmitter */
535
536 priv->currtxdescr = descr;
537 outw(CMDREG_TXP, dev->base_addr + SONIC_CMDREG);
538}
539
540/* ------------------------------------------------------------------------
541 * interrupt handler(s)
542 * ------------------------------------------------------------------------ */
543
544/* receive buffer area exhausted */
545
546static void irqrbe_handler(struct net_device *dev)
547{
548 ibmlana_priv *priv = netdev_priv(dev);
549
550 /* point the SONIC back to the RRA start */
551
552 outw(priv->rrastart, dev->base_addr + SONIC_RRP);
553 outw(priv->rrastart, dev->base_addr + SONIC_RWP);
554}
555
556/* receive interrupt */
557
558static void irqrx_handler(struct net_device *dev)
559{
560 ibmlana_priv *priv = netdev_priv(dev);
561 rda_t rda;
562 u32 rdaaddr, lrdaaddr;
563
564 /* loop until ... */
565
566 while (1) {
567 /* read descriptor that was next to be filled by SONIC */
568
569 rdaaddr = priv->rdastart + (priv->nextrxdescr * sizeof(rda_t));
570 lrdaaddr = priv->rdastart + (priv->lastrxdescr * sizeof(rda_t));
571 memcpy_fromio(&rda, priv->base + rdaaddr, sizeof(rda_t));
572
d7fbeba6 573 /* iron out upper word halves of fields we use - SONIC will duplicate
1da177e4
LT		 574 bits 0..15 to 16..31 */
575
576 rda.status &= 0xffff;
577 rda.length &= 0xffff;
578 rda.startlo &= 0xffff;
579
580 /* stop if the SONIC still owns it, i.e. there is no data for us */
581
582 if (rda.inuse)
583 break;
584
585 /* good packet? */
586
587 else if (rda.status & RCREG_PRX) {
588 struct sk_buff *skb;
589
590 /* fetch buffer */
591
592 skb = dev_alloc_skb(rda.length + 2);
593 if (skb == NULL)
594 priv->stat.rx_dropped++;
595 else {
596 /* copy out data */
597
598 memcpy_fromio(skb_put(skb, rda.length),
599 priv->base +
600 rda.startlo, rda.length);
601
602 /* set up skb fields */
603
1da177e4
LT		 604 skb->protocol = eth_type_trans(skb, dev);
605 skb->ip_summed = CHECKSUM_NONE;
606
607 /* bookkeeping */
608 dev->last_rx = jiffies;
609 priv->stat.rx_packets++;
610 priv->stat.rx_bytes += rda.length;
611
612 /* pass to the upper layers */
613 netif_rx(skb);
614 }
615 }
616
617 /* otherwise check error status bits and increase statistics */
618
619 else {
620 priv->stat.rx_errors++;
621 if (rda.status & RCREG_FAER)
622 priv->stat.rx_frame_errors++;
623 if (rda.status & RCREG_CRCR)
624 priv->stat.rx_crc_errors++;
625 }
626
627 /* descriptor processed, will become new last descriptor in queue */
628
629 rda.link = 1;
630 rda.inuse = 1;
631 memcpy_toio(priv->base + rdaaddr, &rda,
632 sizeof(rda_t));
633
634 /* set up link and EOL = 0 in currently last descriptor. Only write
635 the link field since the SONIC may currently already access the
636 other fields. */
637
638 memcpy_toio(priv->base + lrdaaddr + 20, &rdaaddr, 4);
639
640 /* advance indices */
641
642 priv->lastrxdescr = priv->nextrxdescr;
643 if ((++priv->nextrxdescr) >= priv->rxbufcnt)
644 priv->nextrxdescr = 0;
645 }
646}
647
648/* transmit interrupt */
649
650static void irqtx_handler(struct net_device *dev)
651{
652 ibmlana_priv *priv = netdev_priv(dev);
653 tda_t tda;
654
655 /* fetch descriptor (we forgot the size ;-) */
656 memcpy_fromio(&tda, priv->base + priv->tdastart + (priv->currtxdescr * sizeof(tda_t)), sizeof(tda_t));
657
658 /* update statistics */
659 priv->stat.tx_packets++;
660 priv->stat.tx_bytes += tda.length;
661
662 /* update our pointers */
663 priv->txused[priv->currtxdescr] = 0;
664 priv->txusedcnt--;
665
666 /* if there are more descriptors present in RAM, start them */
667 if (priv->txusedcnt > 0)
668 StartTx(dev, (priv->currtxdescr + 1) % TXBUFCNT);
669
670 /* tell the upper layer we can go on transmitting */
671 netif_wake_queue(dev);
672}
673
674static void irqtxerr_handler(struct net_device *dev)
675{
676 ibmlana_priv *priv = netdev_priv(dev);
677 tda_t tda;
678
679 /* fetch descriptor to check status */
680 memcpy_fromio(&tda, priv->base + priv->tdastart + (priv->currtxdescr * sizeof(tda_t)), sizeof(tda_t));
681
682 /* update statistics */
683 priv->stat.tx_errors++;
684 if (tda.status & (TCREG_NCRS | TCREG_CRSL))
685 priv->stat.tx_carrier_errors++;
686 if (tda.status & TCREG_EXC)
687 priv->stat.tx_aborted_errors++;
688 if (tda.status & TCREG_OWC)
689 priv->stat.tx_window_errors++;
690 if (tda.status & TCREG_FU)
691 priv->stat.tx_fifo_errors++;
692
693 /* update our pointers */
694 priv->txused[priv->currtxdescr] = 0;
695 priv->txusedcnt--;
696
697 /* if there are more descriptors present in RAM, start them */
698 if (priv->txusedcnt > 0)
699 StartTx(dev, (priv->currtxdescr + 1) % TXBUFCNT);
700
701 /* tell the upper layer we can go on transmitting */
702 netif_wake_queue(dev);
703}
704
705/* general interrupt entry */
706
7d12e780 707static irqreturn_t irq_handler(int irq, void *device)
1da177e4
LT		 708{
709 struct net_device *dev = (struct net_device *) device;
710 u16 ival;
711
712 /* in case we're not meant... */
713 if (!(inb(dev->base_addr + BCMREG) & BCMREG_IPEND))
714 return IRQ_NONE;
715
716 /* loop through the interrupt bits until everything is clear */
717 while (1) {
718 ival = inw(dev->base_addr + SONIC_ISREG);
719
720 if (ival & ISREG_RBE) {
721 irqrbe_handler(dev);
722 outw(ISREG_RBE, dev->base_addr + SONIC_ISREG);
723 }
724 if (ival & ISREG_PKTRX) {
725 irqrx_handler(dev);
726 outw(ISREG_PKTRX, dev->base_addr + SONIC_ISREG);
727 }
728 if (ival & ISREG_TXDN) {
729 irqtx_handler(dev);
730 outw(ISREG_TXDN, dev->base_addr + SONIC_ISREG);
731 }
732 if (ival & ISREG_TXER) {
733 irqtxerr_handler(dev);
734 outw(ISREG_TXER, dev->base_addr + SONIC_ISREG);
735 }
736 break;
737 }
738 return IRQ_HANDLED;
739}
740
741/* ------------------------------------------------------------------------
742 * driver methods
743 * ------------------------------------------------------------------------ */
744
745/* MCA info */
746
747static int ibmlana_getinfo(char *buf, int slot, void *d)
748{
749 int len = 0, i;
750 struct net_device *dev = (struct net_device *) d;
751 ibmlana_priv *priv;
752
753 /* can't say anything about an uninitialized device... */
754
755 if (dev == NULL)
756 return len;
757 priv = netdev_priv(dev);
758
759 /* print info */
760
761 len += sprintf(buf + len, "IRQ: %d\n", priv->realirq);
762 len += sprintf(buf + len, "I/O: %#lx\n", dev->base_addr);
763 len += sprintf(buf + len, "Memory: %#lx-%#lx\n", dev->mem_start, dev->mem_end - 1);
764 len += sprintf(buf + len, "Transceiver: %s\n", MediaNames[priv->medium]);
765 len += sprintf(buf + len, "Device: %s\n", dev->name);
766 len += sprintf(buf + len, "MAC address:");
767 for (i = 0; i < 6; i++)
768 len += sprintf(buf + len, " %02x", dev->dev_addr[i]);
769 buf[len++] = '\n';
770 buf[len] = 0;
771
772 return len;
773}
774
775/* open driver. Means also initialization and start of LANCE */
776
777static int ibmlana_open(struct net_device *dev)
778{
779 int result;
780 ibmlana_priv *priv = netdev_priv(dev);
781
782 /* register resources - only necessary for IRQ */
783
1fb9df5d 784 result = request_irq(priv->realirq, irq_handler, IRQF_SHARED | IRQF_SAMPLE_RANDOM, dev->name, dev);
1da177e4
LT		 785 if (result != 0) {
786 printk(KERN_ERR "%s: failed to register irq %d\n", dev->name, dev->irq);
787 return result;
788 }
789 dev->irq = priv->realirq;
790
791 /* set up the card and SONIC */
792 InitBoard(dev);
793
794 /* initialize operational flags */
795 netif_start_queue(dev);
796 return 0;
797}
798
799/* close driver. Shut down board and free allocated resources */
800
801static int ibmlana_close(struct net_device *dev)
802{
803 /* turn off board */
804
805 /* release resources */
806 if (dev->irq != 0)
807 free_irq(dev->irq, dev);
808 dev->irq = 0;
809 return 0;
810}
811
812/* transmit a block. */
813
814static int ibmlana_tx(struct sk_buff *skb, struct net_device *dev)
815{
816 ibmlana_priv *priv = netdev_priv(dev);
817 int retval = 0, tmplen, addr;
818 unsigned long flags;
819 tda_t tda;
820 int baddr;
821
822 /* find out if there are free slots for a frame to transmit. If not,
823 the upper layer is in deep desperation and we simply ignore the frame. */
824
825 if (priv->txusedcnt >= TXBUFCNT) {
826 retval = -EIO;
827 priv->stat.tx_dropped++;
828 goto tx_done;
829 }
830
831 /* copy the frame data into the next free transmit buffer - fillup missing */
832 tmplen = skb->len;
833 if (tmplen < 60)
834 tmplen = 60;
835 baddr = priv->txbufstart + (priv->nexttxdescr * PKTSIZE);
836 memcpy_toio(priv->base + baddr, skb->data, skb->len);
837
d7fbeba6 838 /* copy filler into RAM - in case we're filling up...
1da177e4 839 we're filling a bit more than necessary, but that doesn't harm
d7fbeba6 840 since the buffer is far larger...
1da177e4
LT		 841 Sorry Linus for the filler string but I couldn't resist ;-) */
842
843 if (tmplen > skb->len) {
844 char *fill = "NetBSD is a nice OS too! ";
845 unsigned int destoffs = skb->len, l = strlen(fill);
846
847 while (destoffs < tmplen) {
848 memcpy_toio(priv->base + baddr + destoffs, fill, l);
849 destoffs += l;
850 }
851 }
852
853 /* set up the new frame descriptor */
854 addr = priv->tdastart + (priv->nexttxdescr * sizeof(tda_t));
855 memcpy_fromio(&tda, priv->base + addr, sizeof(tda_t));
856 tda.length = tda.fraglength = tmplen;
857 memcpy_toio(priv->base + addr, &tda, sizeof(tda_t));
858
859 /* if there were no active descriptors, trigger the SONIC */
860 spin_lock_irqsave(&priv->lock, flags);
861
862 priv->txusedcnt++;
863 priv->txused[priv->nexttxdescr] = 1;
864
865 /* are all transmission slots used up ? */
866 if (priv->txusedcnt >= TXBUFCNT)
867 netif_stop_queue(dev);
868
869 if (priv->txusedcnt == 1)
870 StartTx(dev, priv->nexttxdescr);
871 priv->nexttxdescr = (priv->nexttxdescr + 1) % TXBUFCNT;
872
873 spin_unlock_irqrestore(&priv->lock, flags);
874tx_done:
875 dev_kfree_skb(skb);
876 return retval;
877}
878
879/* return pointer to Ethernet statistics */
880
881static struct net_device_stats *ibmlana_stats(struct net_device *dev)
882{
883 ibmlana_priv *priv = netdev_priv(dev);
884 return &priv->stat;
885}
886
887/* switch receiver mode. */
888
889static void ibmlana_set_multicast_list(struct net_device *dev)
890{
891 /* first stop the SONIC... */
892 StopSONIC(dev);
893 /* ...then reinit it with the new flags */
894 InitBoard(dev);
895}
896
897/* ------------------------------------------------------------------------
898 * hardware check
899 * ------------------------------------------------------------------------ */
900
901static int startslot; /* counts through slots when probing multiple devices */
902
903static int ibmlana_probe(struct net_device *dev)
904{
905 int slot, z;
906 int base = 0, irq = 0, iobase = 0, memlen = 0;
907 ibmlana_priv *priv;
908 ibmlana_medium medium;
909
910 SET_MODULE_OWNER(dev);
911
912 /* can't work without an MCA bus ;-) */
913 if (MCA_bus == 0)
914 return -ENODEV;
915
916 base = dev->mem_start;
917 irq = dev->irq;
918
919 for (slot = startslot; (slot = mca_find_adapter(IBM_LANA_ID, slot)) != -1; slot++) {
920 /* deduce card addresses */
921 getaddrs(slot, &base, &memlen, &iobase, &irq, &medium);
922
923 /* slot already in use ? */
924 if (mca_is_adapter_used(slot))
925 continue;
926 /* were we looking for something different ? */
927 if (dev->irq && dev->irq != irq)
928 continue;
929 if (dev->mem_start && dev->mem_start != base)
930 continue;
931 /* found something that matches */
932 break;
933 }
934
935 /* nothing found ? */
936 if (slot == -1)
937 return (base != 0 || irq != 0) ? -ENXIO : -ENODEV;
938
939 /* announce success */
940 printk(KERN_INFO "%s: IBM LAN Adapter/A found in slot %d\n", dev->name, slot + 1);
941
942 /* try to obtain I/O range */
943 if (!request_region(iobase, IBM_LANA_IORANGE, DRV_NAME)) {
944 printk(KERN_ERR "%s: cannot allocate I/O range at %#x!\n", DRV_NAME, iobase);
945 startslot = slot + 1;
946 return -EBUSY;
947 }
948
949 priv = netdev_priv(dev);
950 priv->slot = slot;
951 priv->realirq = irq;
952 priv->medium = medium;
953 spin_lock_init(&priv->lock);
d7fbeba6 954
1da177e4
LT		 955
956 /* set base + irq for this device (irq not allocated so far) */
957
958 dev->irq = 0;
959 dev->mem_start = base;
960 dev->mem_end = base + memlen;
961 dev->base_addr = iobase;
962
963 priv->base = ioremap(base, memlen);
964 if (!priv->base) {
965 printk(KERN_ERR "%s: cannot remap memory!\n", DRV_NAME);
966 startslot = slot + 1;
967 release_region(iobase, IBM_LANA_IORANGE);
968 return -EBUSY;
969 }
970
971 /* make procfs entries */
972 mca_set_adapter_name(slot, "IBM LAN Adapter/A");
973 mca_set_adapter_procfn(slot, (MCA_ProcFn) ibmlana_getinfo, dev);
974
975 mca_mark_as_used(slot);
976
977 /* set methods */
978
979 dev->open = ibmlana_open;
980 dev->stop = ibmlana_close;
981 dev->hard_start_xmit = ibmlana_tx;
982 dev->do_ioctl = NULL;
983 dev->get_stats = ibmlana_stats;
984 dev->set_multicast_list = ibmlana_set_multicast_list;
985 dev->flags |= IFF_MULTICAST;
986
987 /* copy out MAC address */
988
989 for (z = 0; z < sizeof(dev->dev_addr); z++)
990 dev->dev_addr[z] = inb(dev->base_addr + MACADDRPROM + z);
991
992 /* print config */
993
994 printk(KERN_INFO "%s: IRQ %d, I/O %#lx, memory %#lx-%#lx, "
995 "MAC address %02x:%02x:%02x:%02x:%02x:%02x.\n",
996 dev->name, priv->realirq, dev->base_addr,
997 dev->mem_start, dev->mem_end - 1,
998 dev->dev_addr[0], dev->dev_addr[1], dev->dev_addr[2],
999 dev->dev_addr[3], dev->dev_addr[4], dev->dev_addr[5]);
1000 printk(KERN_INFO "%s: %s medium\n", dev->name, MediaNames[priv->medium]);
1001
1002 /* reset board */
1003
1004 ResetBoard(dev);
1005
1006 /* next probe will start at next slot */
1007
1008 startslot = slot + 1;
1009
1010 return 0;
1011}
1012
1013/* ------------------------------------------------------------------------
1014 * modularization support
1015 * ------------------------------------------------------------------------ */
1016
1017#ifdef MODULE
1018
1019#define DEVMAX 5
1020
1021static struct net_device *moddevs[DEVMAX];
1022static int irq;
1023static int io;
1024
1025module_param(irq, int, 0);
1026module_param(io, int, 0);
1027MODULE_PARM_DESC(irq, "IBM LAN/A IRQ number");
1028MODULE_PARM_DESC(io, "IBM LAN/A I/O base address");
1029MODULE_LICENSE("GPL");
1030
1031int init_module(void)
1032{
1033 int z;
1034
1035 startslot = 0;
1036 for (z = 0; z < DEVMAX; z++) {
1037 struct net_device *dev = alloc_etherdev(sizeof(ibmlana_priv));
1038 if (!dev)
1039 break;
1040 dev->irq = irq;
1041 dev->base_addr = io;
1042 if (ibmlana_probe(dev)) {
1043 free_netdev(dev);
1044 break;
1045 }
1046 if (register_netdev(dev)) {
1047 ibmlana_priv *priv = netdev_priv(dev);
1048 release_region(dev->base_addr, IBM_LANA_IORANGE);
1049 mca_mark_as_unused(priv->slot);
1050 mca_set_adapter_name(priv->slot, "");
1051 mca_set_adapter_procfn(priv->slot, NULL, NULL);
1052 iounmap(priv->base);
1053 free_netdev(dev);
1054 break;
1055 }
1056 moddevs[z] = dev;
1057 }
1058 return (z > 0) ? 0 : -EIO;
1059}
1060
1061void cleanup_module(void)
1062{
1063 int z;
1064 for (z = 0; z < DEVMAX; z++) {
1065 struct net_device *dev = moddevs[z];
1066 if (dev) {
1067 ibmlana_priv *priv = netdev_priv(dev);
1068 unregister_netdev(dev);
1069 /*DeinitBoard(dev); */
1070 release_region(dev->base_addr, IBM_LANA_IORANGE);
1071 mca_mark_as_unused(priv->slot);
1072 mca_set_adapter_name(priv->slot, "");
1073 mca_set_adapter_procfn(priv->slot, NULL, NULL);
1074 iounmap(priv->base);
1075 free_netdev(dev);
1076 }
1077 }
1078}
1079#endif /* MODULE */
Linux 6.x block layer and io_uring tree(s)