1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * macsonic.c
4  *
5  * (C) 2005 Finn Thain
6  *
7  * Converted to DMA API, converted to unified driver model, made it work as
8  * a module again, and from the mac68k project, introduced more 32-bit cards
9  * and dhd's support for 16-bit cards.
10  *
11  * (C) 1998 Alan Cox
12  *
13  * Debugging Andreas Ehliar, Michael Schmitz
14  *
15  * Based on code
16  * (C) 1996 by Thomas Bogendoerfer (tsbogend@bigbug.franken.de)
17  *
18  * This driver is based on work from Andreas Busse, but most of
19  * the code is rewritten.
20  *
21  * (C) 1995 by Andreas Busse (andy@waldorf-gmbh.de)
22  *
23  * A driver for the Mac onboard Sonic ethernet chip.
24  *
25  * 98/12/21 MSch: judged from tests on Q800, it's basically working,
26  *		  but eating up both receive and transmit resources
27  *		  and duplicating packets. Needs more testing.
28  *
29  * 99/01/03 MSch: upgraded to version 0.92 of the core driver, fixed.
30  *
31  * 00/10/31 sammy@oh.verio.com: Updated driver for 2.4 kernels, fixed problems
32  *          on centris.
33  */
34 
35 #include <linux/kernel.h>
36 #include <linux/module.h>
37 #include <linux/types.h>
38 #include <linux/fcntl.h>
39 #include <linux/gfp.h>
40 #include <linux/interrupt.h>
41 #include <linux/ioport.h>
42 #include <linux/in.h>
43 #include <linux/string.h>
44 #include <linux/delay.h>
45 #include <linux/nubus.h>
46 #include <linux/errno.h>
47 #include <linux/netdevice.h>
48 #include <linux/etherdevice.h>
49 #include <linux/skbuff.h>
50 #include <linux/platform_device.h>
51 #include <linux/dma-mapping.h>
52 #include <linux/bitrev.h>
53 #include <linux/slab.h>
54 #include <linux/pgtable.h>
55 
56 #include <asm/io.h>
57 #include <asm/hwtest.h>
58 #include <asm/dma.h>
59 #include <asm/macintosh.h>
60 #include <asm/macints.h>
61 #include <asm/mac_via.h>
62 
63 #include "sonic.h"
64 
65 /* These should basically be bus-size and endian independent (since
66    the SONIC is at least smart enough that it uses the same endianness
67    as the host, unlike certain less enlightened Macintosh NICs) */
68 #define SONIC_READ(reg) (nubus_readw(dev->base_addr + (reg * 4) \
69 	      + lp->reg_offset))
70 #define SONIC_WRITE(reg,val) (nubus_writew(val, dev->base_addr + (reg * 4) \
71 	      + lp->reg_offset))
72 
73 /* For onboard SONIC */
74 #define ONBOARD_SONIC_REGISTERS	0x50F0A000
75 #define ONBOARD_SONIC_PROM_BASE	0x50f08000
76 
77 enum macsonic_type {
78 	MACSONIC_DUODOCK,
79 	MACSONIC_APPLE,
80 	MACSONIC_APPLE16,
81 	MACSONIC_DAYNA,
82 	MACSONIC_DAYNALINK
83 };
84 
85 /* For the built-in SONIC in the Duo Dock */
86 #define DUODOCK_SONIC_REGISTERS 0xe10000
87 #define DUODOCK_SONIC_PROM_BASE 0xe12000
88 
89 /* For Apple-style NuBus SONIC */
90 #define APPLE_SONIC_REGISTERS	0
91 #define APPLE_SONIC_PROM_BASE	0x40000
92 
93 /* Daynalink LC SONIC */
94 #define DAYNALINK_PROM_BASE 0x400000
95 
96 /* For Dayna-style NuBus SONIC (haven't seen one yet) */
97 #define DAYNA_SONIC_REGISTERS   0x180000
98 /* This is what OpenBSD says.  However, this is definitely in NuBus
99    ROM space so we should be able to get it by walking the NuBus
100    resource directories */
101 #define DAYNA_SONIC_MAC_ADDR	0xffe004
102 
103 #define SONIC_READ_PROM(addr) nubus_readb(prom_addr+addr)
104 
105 /*
106  * For reversing the PROM address
107  */
108 
109 static inline void bit_reverse_addr(unsigned char addr[6])
110 {
111 	int i;
112 
113 	for(i = 0; i < 6; i++)
114 		addr[i] = bitrev8(addr[i]);
115 }
116 
117 static int macsonic_open(struct net_device* dev)
118 {
119 	int retval;
120 
121 	retval = request_irq(dev->irq, sonic_interrupt, 0, "sonic", dev);
122 	if (retval) {
123 		printk(KERN_ERR "%s: unable to get IRQ %d.\n",
124 				dev->name, dev->irq);
125 		goto err;
126 	}
127 	/* Under the A/UX interrupt scheme, the onboard SONIC interrupt gets
128 	 * moved from level 2 to level 3. Unfortunately we still get some
129 	 * level 2 interrupts so register the handler for both.
130 	 */
131 	if (dev->irq == IRQ_AUTO_3) {
132 		retval = request_irq(IRQ_NUBUS_9, sonic_interrupt, 0,
133 				     "sonic", dev);
134 		if (retval) {
135 			printk(KERN_ERR "%s: unable to get IRQ %d.\n",
136 					dev->name, IRQ_NUBUS_9);
137 			goto err_irq;
138 		}
139 	}
140 	retval = sonic_open(dev);
141 	if (retval)
142 		goto err_irq_nubus;
143 	return 0;
144 
145 err_irq_nubus:
146 	if (dev->irq == IRQ_AUTO_3)
147 		free_irq(IRQ_NUBUS_9, dev);
148 err_irq:
149 	free_irq(dev->irq, dev);
150 err:
151 	return retval;
152 }
153 
154 static int macsonic_close(struct net_device* dev)
155 {
156 	int err;
157 	err = sonic_close(dev);
158 	free_irq(dev->irq, dev);
159 	if (dev->irq == IRQ_AUTO_3)
160 		free_irq(IRQ_NUBUS_9, dev);
161 	return err;
162 }
163 
164 static const struct net_device_ops macsonic_netdev_ops = {
165 	.ndo_open		= macsonic_open,
166 	.ndo_stop		= macsonic_close,
167 	.ndo_start_xmit		= sonic_send_packet,
168 	.ndo_set_rx_mode	= sonic_multicast_list,
169 	.ndo_tx_timeout		= sonic_tx_timeout,
170 	.ndo_get_stats		= sonic_get_stats,
171 	.ndo_validate_addr	= eth_validate_addr,
172 	.ndo_set_mac_address	= eth_mac_addr,
173 };
174 
175 static int macsonic_init(struct net_device *dev)
176 {
177 	struct sonic_local* lp = netdev_priv(dev);
178 	int err = sonic_alloc_descriptors(dev);
179 
180 	if (err)
181 		return err;
182 
183 	dev->netdev_ops = &macsonic_netdev_ops;
184 	dev->watchdog_timeo = TX_TIMEOUT;
185 
186 	/*
187 	 * clear tally counter
188 	 */
189 	SONIC_WRITE(SONIC_CRCT, 0xffff);
190 	SONIC_WRITE(SONIC_FAET, 0xffff);
191 	SONIC_WRITE(SONIC_MPT, 0xffff);
192 
193 	return 0;
194 }
195 
196 #define INVALID_MAC(mac) (memcmp(mac, "\x08\x00\x07", 3) && \
197                           memcmp(mac, "\x00\xA0\x40", 3) && \
198                           memcmp(mac, "\x00\x80\x19", 3) && \
199                           memcmp(mac, "\x00\x05\x02", 3))
200 
201 static void mac_onboard_sonic_ethernet_addr(struct net_device *dev)
202 {
203 	struct sonic_local *lp = netdev_priv(dev);
204 	const int prom_addr = ONBOARD_SONIC_PROM_BASE;
205 	unsigned short val;
206 
207 	/*
208 	 * On NuBus boards we can sometimes look in the ROM resources.
209 	 * No such luck for comm-slot/onboard.
210 	 * On the PowerBook 520, the PROM base address is a mystery.
211 	 */
212 	if (hwreg_present((void *)prom_addr)) {
213 		int i;
214 
215 		for (i = 0; i < 6; i++)
216 			dev->dev_addr[i] = SONIC_READ_PROM(i);
217 		if (!INVALID_MAC(dev->dev_addr))
218 			return;
219 
220 		/*
221 		 * Most of the time, the address is bit-reversed. The NetBSD
222 		 * source has a rather long and detailed historical account of
223 		 * why this is so.
224 		 */
225 		bit_reverse_addr(dev->dev_addr);
226 		if (!INVALID_MAC(dev->dev_addr))
227 			return;
228 
229 		/*
230 		 * If we still have what seems to be a bogus address, we'll
231 		 * look in the CAM. The top entry should be ours.
232 		 */
233 		printk(KERN_WARNING "macsonic: MAC address in PROM seems "
234 		                    "to be invalid, trying CAM\n");
235 	} else {
236 		printk(KERN_WARNING "macsonic: cannot read MAC address from "
237 		                    "PROM, trying CAM\n");
238 	}
239 
240 	/* This only works if MacOS has already initialized the card. */
241 
242 	SONIC_WRITE(SONIC_CMD, SONIC_CR_RST);
243 	SONIC_WRITE(SONIC_CEP, 15);
244 
245 	val = SONIC_READ(SONIC_CAP2);
246 	dev->dev_addr[5] = val >> 8;
247 	dev->dev_addr[4] = val & 0xff;
248 	val = SONIC_READ(SONIC_CAP1);
249 	dev->dev_addr[3] = val >> 8;
250 	dev->dev_addr[2] = val & 0xff;
251 	val = SONIC_READ(SONIC_CAP0);
252 	dev->dev_addr[1] = val >> 8;
253 	dev->dev_addr[0] = val & 0xff;
254 
255 	if (!INVALID_MAC(dev->dev_addr))
256 		return;
257 
258 	/* Still nonsense ... messed up someplace! */
259 
260 	printk(KERN_WARNING "macsonic: MAC address in CAM entry 15 "
261 	                    "seems invalid, will use a random MAC\n");
262 	eth_hw_addr_random(dev);
263 }
264 
265 static int mac_onboard_sonic_probe(struct net_device *dev)
266 {
267 	struct sonic_local* lp = netdev_priv(dev);
268 	int sr;
269 	bool commslot = macintosh_config->expansion_type == MAC_EXP_PDS_COMM;
270 
271 	/* Bogus probing, on the models which may or may not have
272 	   Ethernet (BTW, the Ethernet *is* always at the same
273 	   address, and nothing else lives there, at least if Apple's
274 	   documentation is to be believed) */
275 	if (commslot || macintosh_config->ident == MAC_MODEL_C610) {
276 		int card_present;
277 
278 		card_present = hwreg_present((void*)ONBOARD_SONIC_REGISTERS);
279 		if (!card_present) {
280 			pr_info("Onboard/comm-slot SONIC not found\n");
281 			return -ENODEV;
282 		}
283 	}
284 
285 	/* Danger!  My arms are flailing wildly!  You *must* set lp->reg_offset
286 	 * and dev->base_addr before using SONIC_READ() or SONIC_WRITE() */
287 	dev->base_addr = ONBOARD_SONIC_REGISTERS;
288 	if (via_alt_mapping)
289 		dev->irq = IRQ_AUTO_3;
290 	else
291 		dev->irq = IRQ_NUBUS_9;
292 
293 	/* The PowerBook's SONIC is 16 bit always. */
294 	if (macintosh_config->ident == MAC_MODEL_PB520) {
295 		lp->reg_offset = 0;
296 		lp->dma_bitmode = SONIC_BITMODE16;
297 	} else if (commslot) {
298 		/* Some of the comm-slot cards are 16 bit.  But some
299 		   of them are not.  The 32-bit cards use offset 2 and
300 		   have known revisions, we try reading the revision
301 		   register at offset 2, if we don't get a known revision
302 		   we assume 16 bit at offset 0.  */
303 		lp->reg_offset = 2;
304 		lp->dma_bitmode = SONIC_BITMODE16;
305 
306 		sr = SONIC_READ(SONIC_SR);
307 		if (sr == 0x0004 || sr == 0x0006 || sr == 0x0100 || sr == 0x0101)
308 			/* 83932 is 0x0004 or 0x0006, 83934 is 0x0100 or 0x0101 */
309 			lp->dma_bitmode = SONIC_BITMODE32;
310 		else {
311 			lp->dma_bitmode = SONIC_BITMODE16;
312 			lp->reg_offset = 0;
313 		}
314 	} else {
315 		/* All onboard cards are at offset 2 with 32 bit DMA. */
316 		lp->reg_offset = 2;
317 		lp->dma_bitmode = SONIC_BITMODE32;
318 	}
319 
320 	pr_info("Onboard/comm-slot SONIC, revision 0x%04x, %d bit DMA, register offset %d\n",
321 		SONIC_READ(SONIC_SR), lp->dma_bitmode ? 32 : 16,
322 		lp->reg_offset);
323 
324 	/* This is sometimes useful to find out how MacOS configured the card */
325 	pr_debug("%s: DCR=0x%04x, DCR2=0x%04x\n", __func__,
326 		 SONIC_READ(SONIC_DCR) & 0xffff,
327 		 SONIC_READ(SONIC_DCR2) & 0xffff);
328 
329 	/* Software reset, then initialize control registers. */
330 	SONIC_WRITE(SONIC_CMD, SONIC_CR_RST);
331 
332 	SONIC_WRITE(SONIC_DCR, SONIC_DCR_EXBUS | SONIC_DCR_BMS |
333 	                       SONIC_DCR_RFT1  | SONIC_DCR_TFT0 |
334 	                       (lp->dma_bitmode ? SONIC_DCR_DW : 0));
335 
336 	/* This *must* be written back to in order to restore the
337 	 * extended programmable output bits, as it may not have been
338 	 * initialised since the hardware reset. */
339 	SONIC_WRITE(SONIC_DCR2, 0);
340 
341 	/* Clear *and* disable interrupts to be on the safe side */
342 	SONIC_WRITE(SONIC_IMR, 0);
343 	SONIC_WRITE(SONIC_ISR, 0x7fff);
344 
345 	/* Now look for the MAC address. */
346 	mac_onboard_sonic_ethernet_addr(dev);
347 
348 	pr_info("SONIC ethernet @%08lx, MAC %pM, IRQ %d\n",
349 		dev->base_addr, dev->dev_addr, dev->irq);
350 
351 	/* Shared init code */
352 	return macsonic_init(dev);
353 }
354 
355 static int mac_sonic_nubus_ethernet_addr(struct net_device *dev,
356 					 unsigned long prom_addr, int id)
357 {
358 	int i;
359 	for(i = 0; i < 6; i++)
360 		dev->dev_addr[i] = SONIC_READ_PROM(i);
361 
362 	/* Some of the addresses are bit-reversed */
363 	if (id != MACSONIC_DAYNA)
364 		bit_reverse_addr(dev->dev_addr);
365 
366 	return 0;
367 }
368 
369 static int macsonic_ident(struct nubus_rsrc *fres)
370 {
371 	if (fres->dr_hw == NUBUS_DRHW_ASANTE_LC &&
372 	    fres->dr_sw == NUBUS_DRSW_SONIC_LC)
373 		return MACSONIC_DAYNALINK;
374 	if (fres->dr_hw == NUBUS_DRHW_SONIC &&
375 	    fres->dr_sw == NUBUS_DRSW_APPLE) {
376 		/* There has to be a better way to do this... */
377 		if (strstr(fres->board->name, "DuoDock"))
378 			return MACSONIC_DUODOCK;
379 		else
380 			return MACSONIC_APPLE;
381 	}
382 
383 	if (fres->dr_hw == NUBUS_DRHW_SMC9194 &&
384 	    fres->dr_sw == NUBUS_DRSW_DAYNA)
385 		return MACSONIC_DAYNA;
386 
387 	if (fres->dr_hw == NUBUS_DRHW_APPLE_SONIC_LC &&
388 	    fres->dr_sw == 0) { /* huh? */
389 		return MACSONIC_APPLE16;
390 	}
391 	return -1;
392 }
393 
394 static int mac_sonic_nubus_probe_board(struct nubus_board *board, int id,
395 				       struct net_device *dev)
396 {
397 	struct sonic_local* lp = netdev_priv(dev);
398 	unsigned long base_addr, prom_addr;
399 	u16 sonic_dcr;
400 	int reg_offset, dma_bitmode;
401 
402 	switch (id) {
403 	case MACSONIC_DUODOCK:
404 		base_addr = board->slot_addr + DUODOCK_SONIC_REGISTERS;
405 		prom_addr = board->slot_addr + DUODOCK_SONIC_PROM_BASE;
406 		sonic_dcr = SONIC_DCR_EXBUS | SONIC_DCR_RFT0 | SONIC_DCR_RFT1 |
407 		            SONIC_DCR_TFT0;
408 		reg_offset = 2;
409 		dma_bitmode = SONIC_BITMODE32;
410 		break;
411 	case MACSONIC_APPLE:
412 		base_addr = board->slot_addr + APPLE_SONIC_REGISTERS;
413 		prom_addr = board->slot_addr + APPLE_SONIC_PROM_BASE;
414 		sonic_dcr = SONIC_DCR_BMS | SONIC_DCR_RFT1 | SONIC_DCR_TFT0;
415 		reg_offset = 0;
416 		dma_bitmode = SONIC_BITMODE32;
417 		break;
418 	case MACSONIC_APPLE16:
419 		base_addr = board->slot_addr + APPLE_SONIC_REGISTERS;
420 		prom_addr = board->slot_addr + APPLE_SONIC_PROM_BASE;
421 		sonic_dcr = SONIC_DCR_EXBUS | SONIC_DCR_RFT1 | SONIC_DCR_TFT0 |
422 		            SONIC_DCR_PO1 | SONIC_DCR_BMS;
423 		reg_offset = 0;
424 		dma_bitmode = SONIC_BITMODE16;
425 		break;
426 	case MACSONIC_DAYNALINK:
427 		base_addr = board->slot_addr + APPLE_SONIC_REGISTERS;
428 		prom_addr = board->slot_addr + DAYNALINK_PROM_BASE;
429 		sonic_dcr = SONIC_DCR_RFT1 | SONIC_DCR_TFT0 |
430 		            SONIC_DCR_PO1 | SONIC_DCR_BMS;
431 		reg_offset = 0;
432 		dma_bitmode = SONIC_BITMODE16;
433 		break;
434 	case MACSONIC_DAYNA:
435 		base_addr = board->slot_addr + DAYNA_SONIC_REGISTERS;
436 		prom_addr = board->slot_addr + DAYNA_SONIC_MAC_ADDR;
437 		sonic_dcr = SONIC_DCR_BMS |
438 		            SONIC_DCR_RFT1 | SONIC_DCR_TFT0 | SONIC_DCR_PO1;
439 		reg_offset = 0;
440 		dma_bitmode = SONIC_BITMODE16;
441 		break;
442 	default:
443 		printk(KERN_ERR "macsonic: WTF, id is %d\n", id);
444 		return -ENODEV;
445 	}
446 
447 	/* Danger!  My arms are flailing wildly!  You *must* set lp->reg_offset
448 	 * and dev->base_addr before using SONIC_READ() or SONIC_WRITE() */
449 	dev->base_addr = base_addr;
450 	lp->reg_offset = reg_offset;
451 	lp->dma_bitmode = dma_bitmode;
452 	dev->irq = SLOT2IRQ(board->slot);
453 
454 	dev_info(&board->dev, "%s, revision 0x%04x, %d bit DMA, register offset %d\n",
455 		 board->name, SONIC_READ(SONIC_SR),
456 		 lp->dma_bitmode ? 32 : 16, lp->reg_offset);
457 
458 	/* This is sometimes useful to find out how MacOS configured the card */
459 	dev_dbg(&board->dev, "%s: DCR=0x%04x, DCR2=0x%04x\n", __func__,
460 		SONIC_READ(SONIC_DCR) & 0xffff,
461 		SONIC_READ(SONIC_DCR2) & 0xffff);
462 
463 	/* Software reset, then initialize control registers. */
464 	SONIC_WRITE(SONIC_CMD, SONIC_CR_RST);
465 	SONIC_WRITE(SONIC_DCR, sonic_dcr | (dma_bitmode ? SONIC_DCR_DW : 0));
466 	/* This *must* be written back to in order to restore the
467 	 * extended programmable output bits, since it may not have been
468 	 * initialised since the hardware reset. */
469 	SONIC_WRITE(SONIC_DCR2, 0);
470 
471 	/* Clear *and* disable interrupts to be on the safe side */
472 	SONIC_WRITE(SONIC_IMR, 0);
473 	SONIC_WRITE(SONIC_ISR, 0x7fff);
474 
475 	/* Now look for the MAC address. */
476 	if (mac_sonic_nubus_ethernet_addr(dev, prom_addr, id) != 0)
477 		return -ENODEV;
478 
479 	dev_info(&board->dev, "SONIC ethernet @%08lx, MAC %pM, IRQ %d\n",
480 		 dev->base_addr, dev->dev_addr, dev->irq);
481 
482 	/* Shared init code */
483 	return macsonic_init(dev);
484 }
485 
486 static int mac_sonic_platform_probe(struct platform_device *pdev)
487 {
488 	struct net_device *dev;
489 	struct sonic_local *lp;
490 	int err;
491 
492 	dev = alloc_etherdev(sizeof(struct sonic_local));
493 	if (!dev)
494 		return -ENOMEM;
495 
496 	lp = netdev_priv(dev);
497 	lp->device = &pdev->dev;
498 	SET_NETDEV_DEV(dev, &pdev->dev);
499 	platform_set_drvdata(pdev, dev);
500 
501 	err = mac_onboard_sonic_probe(dev);
502 	if (err)
503 		goto out;
504 
505 	sonic_msg_init(dev);
506 
507 	err = register_netdev(dev);
508 	if (err)
509 		goto undo_probe;
510 
511 	return 0;
512 
513 undo_probe:
514 	dma_free_coherent(lp->device,
515 			  SIZEOF_SONIC_DESC * SONIC_BUS_SCALE(lp->dma_bitmode),
516 			  lp->descriptors, lp->descriptors_laddr);
517 out:
518 	free_netdev(dev);
519 
520 	return err;
521 }
522 
523 MODULE_DESCRIPTION("Macintosh SONIC ethernet driver");
524 MODULE_ALIAS("platform:macsonic");
525 
526 #include "sonic.c"
527 
528 static int mac_sonic_platform_remove(struct platform_device *pdev)
529 {
530 	struct net_device *dev = platform_get_drvdata(pdev);
531 	struct sonic_local* lp = netdev_priv(dev);
532 
533 	unregister_netdev(dev);
534 	dma_free_coherent(lp->device, SIZEOF_SONIC_DESC * SONIC_BUS_SCALE(lp->dma_bitmode),
535 	                  lp->descriptors, lp->descriptors_laddr);
536 	free_netdev(dev);
537 
538 	return 0;
539 }
540 
541 static struct platform_driver mac_sonic_platform_driver = {
542 	.probe  = mac_sonic_platform_probe,
543 	.remove = mac_sonic_platform_remove,
544 	.driver = {
545 		.name = "macsonic",
546 	},
547 };
548 
549 static int mac_sonic_nubus_probe(struct nubus_board *board)
550 {
551 	struct net_device *ndev;
552 	struct sonic_local *lp;
553 	struct nubus_rsrc *fres;
554 	int id = -1;
555 	int err;
556 
557 	/* The platform driver will handle a PDS or Comm Slot card (even if
558 	 * it has a pseudoslot declaration ROM).
559 	 */
560 	if (macintosh_config->expansion_type == MAC_EXP_PDS_COMM)
561 		return -ENODEV;
562 
563 	for_each_board_func_rsrc(board, fres) {
564 		if (fres->category != NUBUS_CAT_NETWORK ||
565 		    fres->type != NUBUS_TYPE_ETHERNET)
566 			continue;
567 
568 		id = macsonic_ident(fres);
569 		if (id != -1)
570 			break;
571 	}
572 	if (!fres)
573 		return -ENODEV;
574 
575 	ndev = alloc_etherdev(sizeof(struct sonic_local));
576 	if (!ndev)
577 		return -ENOMEM;
578 
579 	lp = netdev_priv(ndev);
580 	lp->device = &board->dev;
581 	SET_NETDEV_DEV(ndev, &board->dev);
582 
583 	err = mac_sonic_nubus_probe_board(board, id, ndev);
584 	if (err)
585 		goto out;
586 
587 	sonic_msg_init(ndev);
588 
589 	err = register_netdev(ndev);
590 	if (err)
591 		goto undo_probe;
592 
593 	nubus_set_drvdata(board, ndev);
594 
595 	return 0;
596 
597 undo_probe:
598 	dma_free_coherent(lp->device,
599 			  SIZEOF_SONIC_DESC * SONIC_BUS_SCALE(lp->dma_bitmode),
600 			  lp->descriptors, lp->descriptors_laddr);
601 out:
602 	free_netdev(ndev);
603 	return err;
604 }
605 
606 static int mac_sonic_nubus_remove(struct nubus_board *board)
607 {
608 	struct net_device *ndev = nubus_get_drvdata(board);
609 	struct sonic_local *lp = netdev_priv(ndev);
610 
611 	unregister_netdev(ndev);
612 	dma_free_coherent(lp->device,
613 			  SIZEOF_SONIC_DESC * SONIC_BUS_SCALE(lp->dma_bitmode),
614 			  lp->descriptors, lp->descriptors_laddr);
615 	free_netdev(ndev);
616 
617 	return 0;
618 }
619 
620 static struct nubus_driver mac_sonic_nubus_driver = {
621 	.probe  = mac_sonic_nubus_probe,
622 	.remove = mac_sonic_nubus_remove,
623 	.driver = {
624 		.name = "macsonic-nubus",
625 		.owner = THIS_MODULE,
626 	},
627 };
628 
629 static int perr, nerr;
630 
631 static int __init mac_sonic_init(void)
632 {
633 	perr = platform_driver_register(&mac_sonic_platform_driver);
634 	nerr = nubus_driver_register(&mac_sonic_nubus_driver);
635 	return 0;
636 }
637 module_init(mac_sonic_init);
638 
639 static void __exit mac_sonic_exit(void)
640 {
641 	if (!perr)
642 		platform_driver_unregister(&mac_sonic_platform_driver);
643 	if (!nerr)
644 		nubus_driver_unregister(&mac_sonic_nubus_driver);
645 }
646 module_exit(mac_sonic_exit);
647