1/*
2 * Linux ARCnet driver - COM90xx chipset (memory-mapped buffers)
3 *
4 * Written 1994-1999 by Avery Pennarun.
5 * Written 1999 by Martin Mares <mj@ucw.cz>.
6 * Derived from skeleton.c by Donald Becker.
7 *
8 * Special thanks to Contemporary Controls, Inc. (www.ccontrols.com)
9 * for sponsoring the further development of this driver.
10 *
11 * **********************
12 *
13 * The original copyright of skeleton.c was as follows:
14 *
15 * skeleton.c Written 1993 by Donald Becker.
16 * Copyright 1993 United States Government as represented by the
17 * Director, National Security Agency. This software may only be used
18 * and distributed according to the terms of the GNU General Public License as
19 * modified by SRC, incorporated herein by reference.
20 *
21 * **********************
22 *
23 * For more details, see drivers/net/arcnet.c
24 *
25 * **********************
26 */
27
28#define pr_fmt(fmt) "arcnet:" KBUILD_MODNAME ": " fmt
29
30#include <linux/module.h>
31#include <linux/moduleparam.h>
32#include <linux/init.h>
33#include <linux/interrupt.h>
34#include <linux/ioport.h>
35#include <linux/delay.h>
36#include <linux/netdevice.h>
37#include <linux/slab.h>
38#include <linux/io.h>
39
40#include "arcdevice.h"
41#include "com9026.h"
42
43/* Define this to speed up the autoprobe by assuming if only one io port and
44 * shmem are left in the list at Stage 5, they must correspond to each
45 * other.
46 *
47 * This is undefined by default because it might not always be true, and the
48 * extra check makes the autoprobe even more careful. Speed demons can turn
49 * it on - I think it should be fine if you only have one ARCnet card
50 * installed.
51 *
52 * If no ARCnet cards are installed, this delay never happens anyway and thus
53 * the option has no effect.
54 */
55#undef FAST_PROBE
56
57/* Internal function declarations */
58static int com90xx_found(int ioaddr, int airq, u_long shmem, void __iomem *);
59static void com90xx_command(struct net_device *dev, int command);
60static int com90xx_status(struct net_device *dev);
61static void com90xx_setmask(struct net_device *dev, int mask);
62static int com90xx_reset(struct net_device *dev, int really_reset);
63static void com90xx_copy_to_card(struct net_device *dev, int bufnum, int offset,
64 void *buf, int count);
65static void com90xx_copy_from_card(struct net_device *dev, int bufnum,
66 int offset, void *buf, int count);
67
68/* Known ARCnet cards */
69
70static struct net_device *cards[16];
71static int numcards;
72
73/* Handy defines for ARCnet specific stuff */
74
75/* The number of low I/O ports used by the card */
76#define ARCNET_TOTAL_SIZE 16
77
78/* Amount of I/O memory used by the card */
79#define BUFFER_SIZE (512)
80#define MIRROR_SIZE (BUFFER_SIZE * 4)
81
82static int com90xx_skip_probe __initdata = 0;
83
84/* Module parameters */
85
86static int io; /* use the insmod io= irq= shmem= options */
87static int irq;
88static int shmem;
89static char device[9]; /* use eg. device=arc1 to change name */
90
91module_param_hw(io, int, ioport, 0);
92module_param_hw(irq, int, irq, 0);
93module_param(shmem, int, 0);
94module_param_string(device, device, sizeof(device), 0);
95
96static void __init com90xx_probe(void)
97{
98 int count, status, ioaddr, numprint, airq, openparen = 0;
99 unsigned long airqmask;
100 int ports[(0x3f0 - 0x200) / 16 + 1] = { 0 };
101 unsigned long *shmems;
102 void __iomem **iomem;
103 int numports, numshmems, *port;
104 u_long *p;
105 int index;
106
107 if (!io && !irq && !shmem && !*device && com90xx_skip_probe)
108 return;
109
110 shmems = kzalloc(size: ((0x100000 - 0xa0000) / 0x800) * sizeof(unsigned long),
111 GFP_KERNEL);
112 if (!shmems)
113 return;
114 iomem = kzalloc(size: ((0x100000 - 0xa0000) / 0x800) * sizeof(void __iomem *),
115 GFP_KERNEL);
116 if (!iomem) {
117 kfree(objp: shmems);
118 return;
119 }
120
121 if (BUGLVL(D_NORMAL))
122 pr_info("%s\n", "COM90xx chipset support");
123
124 /* set up the arrays where we'll store the possible probe addresses */
125 numports = numshmems = 0;
126 if (io)
127 ports[numports++] = io;
128 else
129 for (count = 0x200; count <= 0x3f0; count += 16)
130 ports[numports++] = count;
131 if (shmem)
132 shmems[numshmems++] = shmem;
133 else
134 for (count = 0xA0000; count <= 0xFF800; count += 2048)
135 shmems[numshmems++] = count;
136
137 /* Stage 1: abandon any reserved ports, or ones with status==0xFF
138 * (empty), and reset any others by reading the reset port.
139 */
140 numprint = -1;
141 for (port = &ports[0]; port - ports < numports; port++) {
142 numprint++;
143 numprint %= 8;
144 if (!numprint) {
145 arc_cont(D_INIT, "\n");
146 arc_cont(D_INIT, "S1: ");
147 }
148 arc_cont(D_INIT, "%Xh ", *port);
149
150 ioaddr = *port;
151
152 if (!request_region(*port, ARCNET_TOTAL_SIZE,
153 "arcnet (90xx)")) {
154 arc_cont(D_INIT_REASONS, "(request_region)\n");
155 arc_cont(D_INIT_REASONS, "S1: ");
156 if (BUGLVL(D_INIT_REASONS))
157 numprint = 0;
158 *port-- = ports[--numports];
159 continue;
160 }
161 if (arcnet_inb(ioaddr, COM9026_REG_R_STATUS) == 0xFF) {
162 arc_cont(D_INIT_REASONS, "(empty)\n");
163 arc_cont(D_INIT_REASONS, "S1: ");
164 if (BUGLVL(D_INIT_REASONS))
165 numprint = 0;
166 release_region(*port, ARCNET_TOTAL_SIZE);
167 *port-- = ports[--numports];
168 continue;
169 }
170 /* begin resetting card */
171 arcnet_inb(ioaddr, COM9026_REG_R_RESET);
172
173 arc_cont(D_INIT_REASONS, "\n");
174 arc_cont(D_INIT_REASONS, "S1: ");
175 if (BUGLVL(D_INIT_REASONS))
176 numprint = 0;
177 }
178 arc_cont(D_INIT, "\n");
179
180 if (!numports) {
181 arc_cont(D_NORMAL, "S1: No ARCnet cards found.\n");
182 kfree(objp: shmems);
183 kfree(objp: iomem);
184 return;
185 }
186 /* Stage 2: we have now reset any possible ARCnet cards, so we can't
187 * do anything until they finish. If D_INIT, print the list of
188 * cards that are left.
189 */
190 numprint = -1;
191 for (port = &ports[0]; port < ports + numports; port++) {
192 numprint++;
193 numprint %= 8;
194 if (!numprint) {
195 arc_cont(D_INIT, "\n");
196 arc_cont(D_INIT, "S2: ");
197 }
198 arc_cont(D_INIT, "%Xh ", *port);
199 }
200 arc_cont(D_INIT, "\n");
201 mdelay(RESETtime);
202
203 /* Stage 3: abandon any shmem addresses that don't have the signature
204 * 0xD1 byte in the right place, or are read-only.
205 */
206 numprint = -1;
207 for (index = 0, p = &shmems[0]; index < numshmems; p++, index++) {
208 void __iomem *base;
209
210 numprint++;
211 numprint %= 8;
212 if (!numprint) {
213 arc_cont(D_INIT, "\n");
214 arc_cont(D_INIT, "S3: ");
215 }
216 arc_cont(D_INIT, "%lXh ", *p);
217
218 if (!request_mem_region(*p, MIRROR_SIZE, "arcnet (90xx)")) {
219 arc_cont(D_INIT_REASONS, "(request_mem_region)\n");
220 arc_cont(D_INIT_REASONS, "Stage 3: ");
221 if (BUGLVL(D_INIT_REASONS))
222 numprint = 0;
223 goto out;
224 }
225 base = ioremap(offset: *p, MIRROR_SIZE);
226 if (!base) {
227 arc_cont(D_INIT_REASONS, "(ioremap)\n");
228 arc_cont(D_INIT_REASONS, "Stage 3: ");
229 if (BUGLVL(D_INIT_REASONS))
230 numprint = 0;
231 goto out1;
232 }
233 if (arcnet_readb(base, COM9026_REG_R_STATUS) != TESTvalue) {
234 arc_cont(D_INIT_REASONS, "(%02Xh != %02Xh)\n",
235 arcnet_readb(base, COM9026_REG_R_STATUS),
236 TESTvalue);
237 arc_cont(D_INIT_REASONS, "S3: ");
238 if (BUGLVL(D_INIT_REASONS))
239 numprint = 0;
240 goto out2;
241 }
242 /* By writing 0x42 to the TESTvalue location, we also make
243 * sure no "mirror" shmem areas show up - if they occur
244 * in another pass through this loop, they will be discarded
245 * because *cptr != TESTvalue.
246 */
247 arcnet_writeb(0x42, base, COM9026_REG_W_INTMASK);
248 if (arcnet_readb(base, COM9026_REG_R_STATUS) != 0x42) {
249 arc_cont(D_INIT_REASONS, "(read only)\n");
250 arc_cont(D_INIT_REASONS, "S3: ");
251 goto out2;
252 }
253 arc_cont(D_INIT_REASONS, "\n");
254 arc_cont(D_INIT_REASONS, "S3: ");
255 if (BUGLVL(D_INIT_REASONS))
256 numprint = 0;
257 iomem[index] = base;
258 continue;
259 out2:
260 iounmap(addr: base);
261 out1:
262 release_mem_region(*p, MIRROR_SIZE);
263 out:
264 *p-- = shmems[--numshmems];
265 index--;
266 }
267 arc_cont(D_INIT, "\n");
268
269 if (!numshmems) {
270 arc_cont(D_NORMAL, "S3: No ARCnet cards found.\n");
271 for (port = &ports[0]; port < ports + numports; port++)
272 release_region(*port, ARCNET_TOTAL_SIZE);
273 kfree(objp: shmems);
274 kfree(objp: iomem);
275 return;
276 }
277 /* Stage 4: something of a dummy, to report the shmems that are
278 * still possible after stage 3.
279 */
280 numprint = -1;
281 for (p = &shmems[0]; p < shmems + numshmems; p++) {
282 numprint++;
283 numprint %= 8;
284 if (!numprint) {
285 arc_cont(D_INIT, "\n");
286 arc_cont(D_INIT, "S4: ");
287 }
288 arc_cont(D_INIT, "%lXh ", *p);
289 }
290 arc_cont(D_INIT, "\n");
291
292 /* Stage 5: for any ports that have the correct status, can disable
293 * the RESET flag, and (if no irq is given) generate an autoirq,
294 * register an ARCnet device.
295 *
296 * Currently, we can only register one device per probe, so quit
297 * after the first one is found.
298 */
299 numprint = -1;
300 for (port = &ports[0]; port < ports + numports; port++) {
301 int found = 0;
302
303 numprint++;
304 numprint %= 8;
305 if (!numprint) {
306 arc_cont(D_INIT, "\n");
307 arc_cont(D_INIT, "S5: ");
308 }
309 arc_cont(D_INIT, "%Xh ", *port);
310
311 ioaddr = *port;
312 status = arcnet_inb(ioaddr, COM9026_REG_R_STATUS);
313
314 if ((status & 0x9D)
315 != (NORXflag | RECONflag | TXFREEflag | RESETflag)) {
316 arc_cont(D_INIT_REASONS, "(status=%Xh)\n", status);
317 arc_cont(D_INIT_REASONS, "S5: ");
318 if (BUGLVL(D_INIT_REASONS))
319 numprint = 0;
320 release_region(*port, ARCNET_TOTAL_SIZE);
321 *port-- = ports[--numports];
322 continue;
323 }
324 arcnet_outb(CFLAGScmd | RESETclear | CONFIGclear,
325 ioaddr, COM9026_REG_W_COMMAND);
326 status = arcnet_inb(ioaddr, COM9026_REG_R_STATUS);
327 if (status & RESETflag) {
328 arc_cont(D_INIT_REASONS, " (eternal reset, status=%Xh)\n",
329 status);
330 arc_cont(D_INIT_REASONS, "S5: ");
331 if (BUGLVL(D_INIT_REASONS))
332 numprint = 0;
333 release_region(*port, ARCNET_TOTAL_SIZE);
334 *port-- = ports[--numports];
335 continue;
336 }
337 /* skip this completely if an IRQ was given, because maybe
338 * we're on a machine that locks during autoirq!
339 */
340 if (!irq) {
341 /* if we do this, we're sure to get an IRQ since the
342 * card has just reset and the NORXflag is on until
343 * we tell it to start receiving.
344 */
345 airqmask = probe_irq_on();
346 arcnet_outb(NORXflag, ioaddr, COM9026_REG_W_INTMASK);
347 udelay(1);
348 arcnet_outb(0, ioaddr, COM9026_REG_W_INTMASK);
349 airq = probe_irq_off(airqmask);
350
351 if (airq <= 0) {
352 arc_cont(D_INIT_REASONS, "(airq=%d)\n", airq);
353 arc_cont(D_INIT_REASONS, "S5: ");
354 if (BUGLVL(D_INIT_REASONS))
355 numprint = 0;
356 release_region(*port, ARCNET_TOTAL_SIZE);
357 *port-- = ports[--numports];
358 continue;
359 }
360 } else {
361 airq = irq;
362 }
363
364 arc_cont(D_INIT, "(%d,", airq);
365 openparen = 1;
366
367 /* Everything seems okay. But which shmem, if any, puts
368 * back its signature byte when the card is reset?
369 *
370 * If there are multiple cards installed, there might be
371 * multiple shmems still in the list.
372 */
373#ifdef FAST_PROBE
374 if (numports > 1 || numshmems > 1) {
375 arcnet_inb(ioaddr, COM9026_REG_R_RESET);
376 mdelay(RESETtime);
377 } else {
378 /* just one shmem and port, assume they match */
379 arcnet_writeb(TESTvalue, iomem[0],
380 COM9026_REG_W_INTMASK);
381 }
382#else
383 arcnet_inb(ioaddr, COM9026_REG_R_RESET);
384 mdelay(RESETtime);
385#endif
386
387 for (index = 0; index < numshmems; index++) {
388 u_long ptr = shmems[index];
389 void __iomem *base = iomem[index];
390
391 if (arcnet_readb(base, COM9026_REG_R_STATUS) == TESTvalue) { /* found one */
392 arc_cont(D_INIT, "%lXh)\n", *p);
393 openparen = 0;
394
395 /* register the card */
396 if (com90xx_found(ioaddr: *port, airq, shmem: ptr, base) == 0)
397 found = 1;
398 numprint = -1;
399
400 /* remove shmem from the list */
401 shmems[index] = shmems[--numshmems];
402 iomem[index] = iomem[numshmems];
403 break; /* go to the next I/O port */
404 } else {
405 arc_cont(D_INIT_REASONS, "%Xh-",
406 arcnet_readb(base, COM9026_REG_R_STATUS));
407 }
408 }
409
410 if (openparen) {
411 if (BUGLVL(D_INIT))
412 pr_cont("no matching shmem)\n");
413 if (BUGLVL(D_INIT_REASONS)) {
414 pr_cont("S5: ");
415 numprint = 0;
416 }
417 }
418 if (!found)
419 release_region(*port, ARCNET_TOTAL_SIZE);
420 *port-- = ports[--numports];
421 }
422
423 if (BUGLVL(D_INIT_REASONS))
424 pr_cont("\n");
425
426 /* Now put back TESTvalue on all leftover shmems. */
427 for (index = 0; index < numshmems; index++) {
428 arcnet_writeb(TESTvalue, iomem[index], COM9026_REG_W_INTMASK);
429 iounmap(addr: iomem[index]);
430 release_mem_region(shmems[index], MIRROR_SIZE);
431 }
432 kfree(objp: shmems);
433 kfree(objp: iomem);
434}
435
436static int __init check_mirror(unsigned long addr, size_t size)
437{
438 void __iomem *p;
439 int res = -1;
440
441 if (!request_mem_region(addr, size, "arcnet (90xx)"))
442 return -1;
443
444 p = ioremap(offset: addr, size);
445 if (p) {
446 if (arcnet_readb(p, COM9026_REG_R_STATUS) == TESTvalue)
447 res = 1;
448 else
449 res = 0;
450 iounmap(addr: p);
451 }
452
453 release_mem_region(addr, size);
454 return res;
455}
456
457/* Set up the struct net_device associated with this card. Called after
458 * probing succeeds.
459 */
460static int __init com90xx_found(int ioaddr, int airq, u_long shmem,
461 void __iomem *p)
462{
463 struct net_device *dev = NULL;
464 struct arcnet_local *lp;
465 u_long first_mirror, last_mirror;
466 int mirror_size;
467
468 /* allocate struct net_device */
469 dev = alloc_arcdev(name: device);
470 if (!dev) {
471 arc_cont(D_NORMAL, "com90xx: Can't allocate device!\n");
472 iounmap(addr: p);
473 release_mem_region(shmem, MIRROR_SIZE);
474 return -ENOMEM;
475 }
476 lp = netdev_priv(dev);
477 /* find the real shared memory start/end points, including mirrors */
478
479 /* guess the actual size of one "memory mirror" - the number of
480 * bytes between copies of the shared memory. On most cards, it's
481 * 2k (or there are no mirrors at all) but on some, it's 4k.
482 */
483 mirror_size = MIRROR_SIZE;
484 if (arcnet_readb(p, COM9026_REG_R_STATUS) == TESTvalue &&
485 check_mirror(addr: shmem - MIRROR_SIZE, MIRROR_SIZE) == 0 &&
486 check_mirror(addr: shmem - 2 * MIRROR_SIZE, MIRROR_SIZE) == 1)
487 mirror_size = 2 * MIRROR_SIZE;
488
489 first_mirror = shmem - mirror_size;
490 while (check_mirror(addr: first_mirror, size: mirror_size) == 1)
491 first_mirror -= mirror_size;
492 first_mirror += mirror_size;
493
494 last_mirror = shmem + mirror_size;
495 while (check_mirror(addr: last_mirror, size: mirror_size) == 1)
496 last_mirror += mirror_size;
497 last_mirror -= mirror_size;
498
499 dev->mem_start = first_mirror;
500 dev->mem_end = last_mirror + MIRROR_SIZE - 1;
501
502 iounmap(addr: p);
503 release_mem_region(shmem, MIRROR_SIZE);
504
505 if (!request_mem_region(dev->mem_start,
506 dev->mem_end - dev->mem_start + 1,
507 "arcnet (90xx)"))
508 goto err_free_dev;
509
510 /* reserve the irq */
511 if (request_irq(irq: airq, handler: arcnet_interrupt, flags: 0, name: "arcnet (90xx)", dev)) {
512 arc_printk(D_NORMAL, dev, "Can't get IRQ %d!\n", airq);
513 goto err_release_mem;
514 }
515 dev->irq = airq;
516
517 /* Initialize the rest of the device structure. */
518 lp->card_name = "COM90xx";
519 lp->hw.command = com90xx_command;
520 lp->hw.status = com90xx_status;
521 lp->hw.intmask = com90xx_setmask;
522 lp->hw.reset = com90xx_reset;
523 lp->hw.owner = THIS_MODULE;
524 lp->hw.copy_to_card = com90xx_copy_to_card;
525 lp->hw.copy_from_card = com90xx_copy_from_card;
526 lp->mem_start = ioremap(offset: dev->mem_start,
527 size: dev->mem_end - dev->mem_start + 1);
528 if (!lp->mem_start) {
529 arc_printk(D_NORMAL, dev, "Can't remap device memory!\n");
530 goto err_free_irq;
531 }
532
533 /* get and check the station ID from offset 1 in shmem */
534 arcnet_set_addr(dev, arcnet_readb(lp->mem_start,
535 COM9026_REG_R_STATION));
536
537 dev->base_addr = ioaddr;
538
539 arc_printk(D_NORMAL, dev, "COM90xx station %02Xh found at %03lXh, IRQ %d, ShMem %lXh (%ld*%xh).\n",
540 dev->dev_addr[0],
541 dev->base_addr, dev->irq, dev->mem_start,
542 (dev->mem_end - dev->mem_start + 1) / mirror_size,
543 mirror_size);
544
545 if (register_netdev(dev))
546 goto err_unmap;
547
548 cards[numcards++] = dev;
549 return 0;
550
551err_unmap:
552 iounmap(addr: lp->mem_start);
553err_free_irq:
554 free_irq(dev->irq, dev);
555err_release_mem:
556 release_mem_region(dev->mem_start, dev->mem_end - dev->mem_start + 1);
557err_free_dev:
558 free_arcdev(dev);
559 return -EIO;
560}
561
562static void com90xx_command(struct net_device *dev, int cmd)
563{
564 short ioaddr = dev->base_addr;
565
566 arcnet_outb(cmd, ioaddr, COM9026_REG_W_COMMAND);
567}
568
569static int com90xx_status(struct net_device *dev)
570{
571 short ioaddr = dev->base_addr;
572
573 return arcnet_inb(ioaddr, COM9026_REG_R_STATUS);
574}
575
576static void com90xx_setmask(struct net_device *dev, int mask)
577{
578 short ioaddr = dev->base_addr;
579
580 arcnet_outb(mask, ioaddr, COM9026_REG_W_INTMASK);
581}
582
583/* Do a hardware reset on the card, and set up necessary registers.
584 *
585 * This should be called as little as possible, because it disrupts the
586 * token on the network (causes a RECON) and requires a significant delay.
587 *
588 * However, it does make sure the card is in a defined state.
589 */
590static int com90xx_reset(struct net_device *dev, int really_reset)
591{
592 struct arcnet_local *lp = netdev_priv(dev);
593 short ioaddr = dev->base_addr;
594
595 arc_printk(D_INIT, dev, "Resetting (status=%02Xh)\n",
596 arcnet_inb(ioaddr, COM9026_REG_R_STATUS));
597
598 if (really_reset) {
599 /* reset the card */
600 arcnet_inb(ioaddr, COM9026_REG_R_RESET);
601 mdelay(RESETtime);
602 }
603 /* clear flags & end reset */
604 arcnet_outb(CFLAGScmd | RESETclear, ioaddr, COM9026_REG_W_COMMAND);
605 arcnet_outb(CFLAGScmd | CONFIGclear, ioaddr, COM9026_REG_W_COMMAND);
606
607#if 0
608 /* don't do this until we verify that it doesn't hurt older cards! */
609 arcnet_outb(arcnet_inb(ioaddr, COM9026_REG_RW_CONFIG) | ENABLE16flag,
610 ioaddr, COM9026_REG_RW_CONFIG);
611#endif
612
613 /* verify that the ARCnet signature byte is present */
614 if (arcnet_readb(lp->mem_start, COM9026_REG_R_STATUS) != TESTvalue) {
615 if (really_reset)
616 arc_printk(D_NORMAL, dev, "reset failed: TESTvalue not present.\n");
617 return 1;
618 }
619 /* enable extended (512-byte) packets */
620 arcnet_outb(CONFIGcmd | EXTconf, ioaddr, COM9026_REG_W_COMMAND);
621
622 /* clean out all the memory to make debugging make more sense :) */
623 if (BUGLVL(D_DURING))
624 memset_io(lp->mem_start, 0x42, 2048);
625
626 /* done! return success. */
627 return 0;
628}
629
630static void com90xx_copy_to_card(struct net_device *dev, int bufnum,
631 int offset, void *buf, int count)
632{
633 struct arcnet_local *lp = netdev_priv(dev);
634 void __iomem *memaddr = lp->mem_start + bufnum * 512 + offset;
635
636 TIME(dev, "memcpy_toio", count, memcpy_toio(memaddr, buf, count));
637}
638
639static void com90xx_copy_from_card(struct net_device *dev, int bufnum,
640 int offset, void *buf, int count)
641{
642 struct arcnet_local *lp = netdev_priv(dev);
643 void __iomem *memaddr = lp->mem_start + bufnum * 512 + offset;
644
645 TIME(dev, "memcpy_fromio", count, memcpy_fromio(buf, memaddr, count));
646}
647
648MODULE_DESCRIPTION("ARCnet COM90xx normal chipset driver");
649MODULE_LICENSE("GPL");
650
651static int __init com90xx_init(void)
652{
653 if (irq == 2)
654 irq = 9;
655 com90xx_probe();
656 if (!numcards)
657 return -EIO;
658 return 0;
659}
660
661static void __exit com90xx_exit(void)
662{
663 struct net_device *dev;
664 struct arcnet_local *lp;
665 int count;
666
667 for (count = 0; count < numcards; count++) {
668 dev = cards[count];
669 lp = netdev_priv(dev);
670
671 unregister_netdev(dev);
672 free_irq(dev->irq, dev);
673 iounmap(addr: lp->mem_start);
674 release_region(dev->base_addr, ARCNET_TOTAL_SIZE);
675 release_mem_region(dev->mem_start,
676 dev->mem_end - dev->mem_start + 1);
677 free_arcdev(dev);
678 }
679}
680
681module_init(com90xx_init);
682module_exit(com90xx_exit);
683
684#ifndef MODULE
685static int __init com90xx_setup(char *s)
686{
687 int ints[8];
688
689 s = get_options(str: s, nints: 8, ints);
690 if (!ints[0] && !*s) {
691 pr_notice("Disabled\n");
692 return 1;
693 }
694
695 switch (ints[0]) {
696 default: /* ERROR */
697 pr_err("Too many arguments\n");
698 fallthrough;
699 case 3: /* Mem address */
700 shmem = ints[3];
701 fallthrough;
702 case 2: /* IRQ */
703 irq = ints[2];
704 fallthrough;
705 case 1: /* IO address */
706 io = ints[1];
707 }
708
709 if (*s)
710 snprintf(buf: device, size: sizeof(device), fmt: "%s", s);
711
712 return 1;
713}
714
715__setup("com90xx=", com90xx_setup);
716#endif
717

source code of linux/drivers/net/arcnet/com90xx.c