summaryrefslogtreecommitdiffstats
path: root/drivers/net/can/softing/softing_fw.c
blob: aac58ce6e371a806c4725be00108c7ac024bc0ae (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
/*
 * Copyright (C) 2008-2010
 *
 * - Kurt Van Dijck, EIA Electronics
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the version 2 of the GNU General Public License
 * as published by the Free Software Foundation
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 */

#include <linux/firmware.h>
#include <linux/sched/signal.h>
#include <asm/div64.h>
#include <asm/io.h>

#include "softing.h"

/*
 * low level DPRAM command.
 * Make sure that card->dpram[DPRAM_FCT_HOST] is preset
 */
static int _softing_fct_cmd(struct softing *card, int16_t cmd, uint16_t vector,
		const char *msg)
{
	int ret;
	unsigned long stamp;

	iowrite16(cmd, &card->dpram[DPRAM_FCT_PARAM]);
	iowrite8(vector >> 8, &card->dpram[DPRAM_FCT_HOST + 1]);
	iowrite8(vector, &card->dpram[DPRAM_FCT_HOST]);
	/* be sure to flush this to the card */
	wmb();
	stamp = jiffies + 1 * HZ;
	/* wait for card */
	do {
		/* DPRAM_FCT_HOST is _not_ aligned */
		ret = ioread8(&card->dpram[DPRAM_FCT_HOST]) +
			(ioread8(&card->dpram[DPRAM_FCT_HOST + 1]) << 8);
		/* don't have any cached variables */
		rmb();
		if (ret == RES_OK)
			/* read return-value now */
			return ioread16(&card->dpram[DPRAM_FCT_RESULT]);

		if ((ret != vector) || time_after(jiffies, stamp))
			break;
		/* process context => relax */
		usleep_range(500, 10000);
	} while (1);

	ret = (ret == RES_NONE) ? -ETIMEDOUT : -ECANCELED;
	dev_alert(&card->pdev->dev, "firmware %s failed (%i)\n", msg, ret);
	return ret;
}

static int softing_fct_cmd(struct softing *card, int16_t cmd, const char *msg)
{
	int ret;

	ret = _softing_fct_cmd(card, cmd, 0, msg);
	if (ret > 0) {
		dev_alert(&card->pdev->dev, "%s returned %u\n", msg, ret);
		ret = -EIO;
	}
	return ret;
}

int softing_bootloader_command(struct softing *card, int16_t cmd,
		const char *msg)
{
	int ret;
	unsigned long stamp;

	iowrite16(RES_NONE, &card->dpram[DPRAM_RECEIPT]);
	iowrite16(cmd, &card->dpram[DPRAM_COMMAND]);
	/* be sure to flush this to the card */
	wmb();
	stamp = jiffies + 3 * HZ;
	/* wait for card */
	do {
		ret = ioread16(&card->dpram[DPRAM_RECEIPT]);
		/* don't have any cached variables */
		rmb();
		if (ret == RES_OK)
			return 0;
		if (time_after(jiffies, stamp))
			break;
		/* process context => relax */
		usleep_range(500, 10000);
	} while (!signal_pending(current));

	ret = (ret == RES_NONE) ? -ETIMEDOUT : -ECANCELED;
	dev_alert(&card->pdev->dev, "bootloader %s failed (%i)\n", msg, ret);
	return ret;
}

static int fw_parse(const uint8_t **pmem, uint16_t *ptype, uint32_t *paddr,
		uint16_t *plen, const uint8_t **pdat)
{
	uint16_t checksum[2];
	const uint8_t *mem;
	const uint8_t *end;

	/*
	 * firmware records are a binary, unaligned stream composed of:
	 * uint16_t type;
	 * uint32_t addr;
	 * uint16_t len;
	 * uint8_t dat[len];
	 * uint16_t checksum;
	 * all values in little endian.
	 * We could define a struct for this, with __attribute__((packed)),
	 * but would that solve the alignment in _all_ cases (cfr. the
	 * struct itself may be an odd address)?
	 *
	 * I chose to use leXX_to_cpup() since this solves both
	 * endianness & alignment.
	 */
	mem = *pmem;
	*ptype = le16_to_cpup((void *)&mem[0]);
	*paddr = le32_to_cpup((void *)&mem[2]);
	*plen = le16_to_cpup((void *)&mem[6]);
	*pdat = &mem[8];
	/* verify checksum */
	end = &mem[8 + *plen];
	checksum[0] = le16_to_cpup((void *)end);
	for (checksum[1] = 0; mem < end; ++mem)
		checksum[1] += *mem;
	if (checksum[0] != checksum[1])
		return -EINVAL;
	/* increment */
	*pmem += 10 + *plen;
	return 0;
}

int softing_load_fw(const char *file, struct softing *card,
		__iomem uint8_t *dpram, unsigned int size, int offset)
{
	const struct firmware *fw;
	int ret;
	const uint8_t *mem, *end, *dat;
	uint16_t type, len;
	uint32_t addr;
	uint8_t *buf = NULL, *new_buf;
	int buflen = 0;
	int8_t type_end = 0;

	ret = request_firmware(&fw, file, &card->pdev->dev);
	if (ret < 0)
		return ret;
	dev_dbg(&card->pdev->dev, "%s, firmware(%s) got %u bytes"
		", offset %c0x%04x\n",
		card->pdat->name, file, (unsigned int)fw->size,
		(offset >= 0) ? '+' : '-', (unsigned int)abs(offset));
	/* parse the firmware */
	mem = fw->data;
	end = &mem[fw->size];
	/* look for header record */
	ret = fw_parse(&mem, &type, &addr, &len, &dat);
	if (ret < 0)
		goto failed;
	if (type != 0xffff)
		goto failed;
	if (strncmp("Structured Binary Format, Softing GmbH" , dat, len)) {
		ret = -EINVAL;
		goto failed;
	}
	/* ok, we had a header */
	while (mem < end) {
		ret = fw_parse(&mem, &type, &addr, &len, &dat);
		if (ret < 0)
			goto failed;
		if (type == 3) {
			/* start address, not used here */
			continue;
		} else if (type == 1) {
			/* eof */
			type_end = 1;
			break;
		} else if (type != 0) {
			ret = -EINVAL;
			goto failed;
		}

		if ((addr + len + offset) > size)
			goto failed;
		memcpy_toio(&dpram[addr + offset], dat, len);
		/* be sure to flush caches from IO space */
		mb();
		if (len > buflen) {
			/* align buflen */
			buflen = (len + (1024-1)) & ~(1024-1);
			new_buf = krealloc(buf, buflen, GFP_KERNEL);
			if (!new_buf) {
				ret = -ENOMEM;
				goto failed;
			}
			buf = new_buf;
		}
		/* verify record data */
		memcpy_fromio(buf, &dpram[addr + offset], len);
		if (memcmp(buf, dat, len)) {
			/* is not ok */
			dev_alert(&card->pdev->dev, "DPRAM readback failed\n");
			ret = -EIO;
			goto failed;
		}
	}
	if (!type_end)
		/* no end record seen */
		goto failed;
	ret = 0;
failed:
	kfree(buf);
	release_firmware(fw);
	if (ret < 0)
		dev_info(&card->pdev->dev, "firmware %s failed\n", file);
	return ret;
}

int softing_load_app_fw(const char *file, struct softing *card)
{
	const struct firmware *fw;
	const uint8_t *mem, *end, *dat;
	int ret, j;
	uint16_t type, len;
	uint32_t addr, start_addr = 0;
	unsigned int sum, rx_sum;
	int8_t type_end = 0, type_entrypoint = 0;

	ret = request_firmware(&fw, file, &card->pdev->dev);
	if (ret) {
		dev_alert(&card->pdev->dev, "request_firmware(%s) got %i\n",
			file, ret);
		return ret;
	}
	dev_dbg(&card->pdev->dev, "firmware(%s) got %lu bytes\n",
		file, (unsigned long)fw->size);
	/* parse the firmware */
	mem = fw->data;
	end = &mem[fw->size];
	/* look for header record */
	ret = fw_parse(&mem, &type, &addr, &len, &dat);
	if (ret)
		goto failed;
	ret = -EINVAL;
	if (type != 0xffff) {
		dev_alert(&card->pdev->dev, "firmware starts with type 0x%x\n",
			type);
		goto failed;
	}
	if (strncmp("Structured Binary Format, Softing GmbH", dat, len)) {
		dev_alert(&card->pdev->dev, "firmware string '%.*s' fault\n",
				len, dat);
		goto failed;
	}
	/* ok, we had a header */
	while (mem < end) {
		ret = fw_parse(&mem, &type, &addr, &len, &dat);
		if (ret)
			goto failed;

		if (type == 3) {
			/* start address */
			start_addr = addr;
			type_entrypoint = 1;
			continue;
		} else if (type == 1) {
			/* eof */
			type_end = 1;
			break;
		} else if (type != 0) {
			dev_alert(&card->pdev->dev,
					"unknown record type 0x%04x\n", type);
			ret = -EINVAL;
			goto failed;
		}

		/* regualar data */
		for (sum = 0, j = 0; j < len; ++j)
			sum += dat[j];
		/* work in 16bit (target) */
		sum &= 0xffff;

		memcpy_toio(&card->dpram[card->pdat->app.offs], dat, len);
		iowrite32(card->pdat->app.offs + card->pdat->app.addr,
				&card->dpram[DPRAM_COMMAND + 2]);
		iowrite32(addr, &card->dpram[DPRAM_COMMAND + 6]);
		iowrite16(len, &card->dpram[DPRAM_COMMAND + 10]);
		iowrite8(1, &card->dpram[DPRAM_COMMAND + 12]);
		ret = softing_bootloader_command(card, 1, "loading app.");
		if (ret < 0)
			goto failed;
		/* verify checksum */
		rx_sum = ioread16(&card->dpram[DPRAM_RECEIPT + 2]);
		if (rx_sum != sum) {
			dev_alert(&card->pdev->dev, "SRAM seems to be damaged"
				", wanted 0x%04x, got 0x%04x\n", sum, rx_sum);
			ret = -EIO;
			goto failed;
		}
	}
	if (!type_end || !type_entrypoint)
		goto failed;
	/* start application in card */
	iowrite32(start_addr, &card->dpram[DPRAM_COMMAND + 2]);
	iowrite8(1, &card->dpram[DPRAM_COMMAND + 6]);
	ret = softing_bootloader_command(card, 3, "start app.");
	if (ret < 0)
		goto failed;
	ret = 0;
failed:
	release_firmware(fw);
	if (ret < 0)
		dev_info(&card->pdev->dev, "firmware %s failed\n", file);
	return ret;
}

static int softing_reset_chip(struct softing *card)
{
	int ret;

	do {
		/* reset chip */
		iowrite8(0, &card->dpram[DPRAM_RESET_RX_FIFO]);
		iowrite8(0, &card->dpram[DPRAM_RESET_RX_FIFO+1]);
		iowrite8(1, &card->dpram[DPRAM_RESET]);
		iowrite8(0, &card->dpram[DPRAM_RESET+1]);

		ret = softing_fct_cmd(card, 0, "reset_can");
		if (!ret)
			break;
		if (signal_pending(current))
			/* don't wait any longer */
			break;
	} while (1);
	card->tx.pending = 0;
	return ret;
}

int softing_chip_poweron(struct softing *card)
{
	int ret;
	/* sync */
	ret = _softing_fct_cmd(card, 99, 0x55, "sync-a");
	if (ret < 0)
		goto failed;

	ret = _softing_fct_cmd(card, 99, 0xaa, "sync-b");
	if (ret < 0)
		goto failed;

	ret = softing_reset_chip(card);
	if (ret < 0)
		goto failed;
	/* get_serial */
	ret = softing_fct_cmd(card, 43, "get_serial_number");
	if (ret < 0)
		goto failed;
	card->id.serial = ioread32(&card->dpram[DPRAM_FCT_PARAM]);
	/* get_version */
	ret = softing_fct_cmd(card, 12, "get_version");
	if (ret < 0)
		goto failed;
	card->id.fw_version = ioread16(&card->dpram[DPRAM_FCT_PARAM + 2]);
	card->id.hw_version = ioread16(&card->dpram[DPRAM_FCT_PARAM + 4]);
	card->id.license = ioread16(&card->dpram[DPRAM_FCT_PARAM + 6]);
	card->id.chip[0] = ioread16(&card->dpram[DPRAM_FCT_PARAM + 8]);
	card->id.chip[1] = ioread16(&card->dpram[DPRAM_FCT_PARAM + 10]);
	return 0;
failed:
	return ret;
}

static void softing_initialize_timestamp(struct softing *card)
{
	uint64_t ovf;

	card->ts_ref = ktime_get();

	/* 16MHz is the reference */
	ovf = 0x100000000ULL * 16;
	do_div(ovf, card->pdat->freq ?: 16);

	card->ts_overflow = ktime_add_us(0, ovf);
}

ktime_t softing_raw2ktime(struct softing *card, u32 raw)
{
	uint64_t rawl;
	ktime_t now, real_offset;
	ktime_t target;
	ktime_t tmp;

	now = ktime_get();
	real_offset = ktime_sub(ktime_get_real(), now);

	/* find nsec from card */
	rawl = raw * 16;
	do_div(rawl, card->pdat->freq ?: 16);
	target = ktime_add_us(card->ts_ref, rawl);
	/* test for overflows */
	tmp = ktime_add(target, card->ts_overflow);
	while (unlikely(ktime_to_ns(tmp) > ktime_to_ns(now))) {
		card->ts_ref = ktime_add(card->ts_ref, card->ts_overflow);
		target = tmp;
		tmp = ktime_add(target, card->ts_overflow);
	}
	return ktime_add(target, real_offset);
}

static inline int softing_error_reporting(struct net_device *netdev)
{
	struct softing_priv *priv = netdev_priv(netdev);

	return (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
		? 1 : 0;
}

int softing_startstop(struct net_device *dev, int up)
{
	int ret;
	struct softing *card;
	struct softing_priv *priv;
	struct net_device *netdev;
	int bus_bitmask_start;
	int j, error_reporting;
	struct can_frame msg;
	const struct can_bittiming *bt;

	priv = netdev_priv(dev);
	card = priv->card;

	if (!card->fw.up)
		return -EIO;

	ret = mutex_lock_interruptible(&card->fw.lock);
	if (ret)
		return ret;

	bus_bitmask_start = 0;
	if (dev && up)
		/* prepare to start this bus as well */
		bus_bitmask_start |= (1 << priv->index);
	/* bring netdevs down */
	for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
		netdev = card->net[j];
		if (!netdev)
			continue;
		priv = netdev_priv(netdev);

		if (dev != netdev)
			netif_stop_queue(netdev);

		if (netif_running(netdev)) {
			if (dev != netdev)
				bus_bitmask_start |= (1 << j);
			priv->tx.pending = 0;
			priv->tx.echo_put = 0;
			priv->tx.echo_get = 0;
			/*
			 * this bus' may just have called open_candev()
			 * which is rather stupid to call close_candev()
			 * already
			 * but we may come here from busoff recovery too
			 * in which case the echo_skb _needs_ flushing too.
			 * just be sure to call open_candev() again
			 */
			close_candev(netdev);
		}
		priv->can.state = CAN_STATE_STOPPED;
	}
	card->tx.pending = 0;

	softing_enable_irq(card, 0);
	ret = softing_reset_chip(card);
	if (ret)
		goto failed;
	if (!bus_bitmask_start)
		/* no busses to be brought up */
		goto card_done;

	if ((bus_bitmask_start & 1) && (bus_bitmask_start & 2)
			&& (softing_error_reporting(card->net[0])
				!= softing_error_reporting(card->net[1]))) {
		dev_alert(&card->pdev->dev,
				"err_reporting flag differs for busses\n");
		goto invalid;
	}
	error_reporting = 0;
	if (bus_bitmask_start & 1) {
		netdev = card->net[0];
		priv = netdev_priv(netdev);
		error_reporting += softing_error_reporting(netdev);
		/* init chip 1 */
		bt = &priv->can.bittiming;
		iowrite16(bt->brp, &card->dpram[DPRAM_FCT_PARAM + 2]);
		iowrite16(bt->sjw, &card->dpram[DPRAM_FCT_PARAM + 4]);
		iowrite16(bt->phase_seg1 + bt->prop_seg,
				&card->dpram[DPRAM_FCT_PARAM + 6]);
		iowrite16(bt->phase_seg2, &card->dpram[DPRAM_FCT_PARAM + 8]);
		iowrite16((priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) ? 1 : 0,
				&card->dpram[DPRAM_FCT_PARAM + 10]);
		ret = softing_fct_cmd(card, 1, "initialize_chip[0]");
		if (ret < 0)
			goto failed;
		/* set mode */
		iowrite16(0, &card->dpram[DPRAM_FCT_PARAM + 2]);
		iowrite16(0, &card->dpram[DPRAM_FCT_PARAM + 4]);
		ret = softing_fct_cmd(card, 3, "set_mode[0]");
		if (ret < 0)
			goto failed;
		/* set filter */
		/* 11bit id & mask */
		iowrite16(0x0000, &card->dpram[DPRAM_FCT_PARAM + 2]);
		iowrite16(0x07ff, &card->dpram[DPRAM_FCT_PARAM + 4]);
		/* 29bit id.lo & mask.lo & id.hi & mask.hi */
		iowrite16(0x0000, &card->dpram[DPRAM_FCT_PARAM + 6]);
		iowrite16(0xffff, &card->dpram[DPRAM_FCT_PARAM + 8]);
		iowrite16(0x0000, &card->dpram[DPRAM_FCT_PARAM + 10]);
		iowrite16(0x1fff, &card->dpram[DPRAM_FCT_PARAM + 12]);
		ret = softing_fct_cmd(card, 7, "set_filter[0]");
		if (ret < 0)
			goto failed;
		/* set output control */
		iowrite16(priv->output, &card->dpram[DPRAM_FCT_PARAM + 2]);
		ret = softing_fct_cmd(card, 5, "set_output[0]");
		if (ret < 0)
			goto failed;
	}
	if (bus_bitmask_start & 2) {
		netdev = card->net[1];
		priv = netdev_priv(netdev);
		error_reporting += softing_error_reporting(netdev);
		/* init chip2 */
		bt = &priv->can.bittiming;
		iowrite16(bt->brp, &card->dpram[DPRAM_FCT_PARAM + 2]);
		iowrite16(bt->sjw, &card->dpram[DPRAM_FCT_PARAM + 4]);
		iowrite16(bt->phase_seg1 + bt->prop_seg,
				&card->dpram[DPRAM_FCT_PARAM + 6]);
		iowrite16(bt->phase_seg2, &card->dpram[DPRAM_FCT_PARAM + 8]);
		iowrite16((priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) ? 1 : 0,
				&card->dpram[DPRAM_FCT_PARAM + 10]);
		ret = softing_fct_cmd(card, 2, "initialize_chip[1]");
		if (ret < 0)
			goto failed;
		/* set mode2 */
		iowrite16(0, &card->dpram[DPRAM_FCT_PARAM + 2]);
		iowrite16(0, &card->dpram[DPRAM_FCT_PARAM + 4]);
		ret = softing_fct_cmd(card, 4, "set_mode[1]");
		if (ret < 0)
			goto failed;
		/* set filter2 */
		/* 11bit id & mask */
		iowrite16(0x0000, &card->dpram[DPRAM_FCT_PARAM + 2]);
		iowrite16(0x07ff, &card->dpram[DPRAM_FCT_PARAM + 4]);
		/* 29bit id.lo & mask.lo & id.hi & mask.hi */
		iowrite16(0x0000, &card->dpram[DPRAM_FCT_PARAM + 6]);
		iowrite16(0xffff, &card->dpram[DPRAM_FCT_PARAM + 8]);
		iowrite16(0x0000, &card->dpram[DPRAM_FCT_PARAM + 10]);
		iowrite16(0x1fff, &card->dpram[DPRAM_FCT_PARAM + 12]);
		ret = softing_fct_cmd(card, 8, "set_filter[1]");
		if (ret < 0)
			goto failed;
		/* set output control2 */
		iowrite16(priv->output, &card->dpram[DPRAM_FCT_PARAM + 2]);
		ret = softing_fct_cmd(card, 6, "set_output[1]");
		if (ret < 0)
			goto failed;
	}
	/* enable_error_frame */
	/*
	 * Error reporting is switched off at the moment since
	 * the receiving of them is not yet 100% verified
	 * This should be enabled sooner or later
	 *
	if (error_reporting) {
		ret = softing_fct_cmd(card, 51, "enable_error_frame");
		if (ret < 0)
			goto failed;
	}
	*/
	/* initialize interface */
	iowrite16(1, &card->dpram[DPRAM_FCT_PARAM + 2]);
	iowrite16(1, &card->dpram[DPRAM_FCT_PARAM + 4]);
	iowrite16(1, &card->dpram[DPRAM_FCT_PARAM + 6]);
	iowrite16(1, &card->dpram[DPRAM_FCT_PARAM + 8]);
	iowrite16(1, &card->dpram[DPRAM_FCT_PARAM + 10]);
	iowrite16(1, &card->dpram[DPRAM_FCT_PARAM + 12]);
	iowrite16(1, &card->dpram[DPRAM_FCT_PARAM + 14]);
	iowrite16(1, &card->dpram[DPRAM_FCT_PARAM + 16]);
	iowrite16(1, &card->dpram[DPRAM_FCT_PARAM + 18]);
	iowrite16(1, &card->dpram[DPRAM_FCT_PARAM + 20]);
	ret = softing_fct_cmd(card, 17, "initialize_interface");
	if (ret < 0)
		goto failed;
	/* enable_fifo */
	ret = softing_fct_cmd(card, 36, "enable_fifo");
	if (ret < 0)
		goto failed;
	/* enable fifo tx ack */
	ret = softing_fct_cmd(card, 13, "fifo_tx_ack[0]");
	if (ret < 0)
		goto failed;
	/* enable fifo tx ack2 */
	ret = softing_fct_cmd(card, 14, "fifo_tx_ack[1]");
	if (ret < 0)
		goto failed;
	/* start_chip */
	ret = softing_fct_cmd(card, 11, "start_chip");
	if (ret < 0)
		goto failed;
	iowrite8(0, &card->dpram[DPRAM_INFO_BUSSTATE]);
	iowrite8(0, &card->dpram[DPRAM_INFO_BUSSTATE2]);
	if (card->pdat->generation < 2) {
		iowrite8(0, &card->dpram[DPRAM_V2_IRQ_TOHOST]);
		/* flush the DPRAM caches */
		wmb();
	}

	softing_initialize_timestamp(card);

	/*
	 * do socketcan notifications/status changes
	 * from here, no errors should occur, or the failed: part
	 * must be reviewed
	 */
	memset(&msg, 0, sizeof(msg));
	msg.can_id = CAN_ERR_FLAG | CAN_ERR_RESTARTED;
	msg.can_dlc = CAN_ERR_DLC;
	for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
		if (!(bus_bitmask_start & (1 << j)))
			continue;
		netdev = card->net[j];
		if (!netdev)
			continue;
		priv = netdev_priv(netdev);
		priv->can.state = CAN_STATE_ERROR_ACTIVE;
		open_candev(netdev);
		if (dev != netdev) {
			/* notify other busses on the restart */
			softing_netdev_rx(netdev, &msg, 0);
			++priv->can.can_stats.restarts;
		}
		netif_wake_queue(netdev);
	}

	/* enable interrupts */
	ret = softing_enable_irq(card, 1);
	if (ret)
		goto failed;
card_done:
	mutex_unlock(&card->fw.lock);
	return 0;
invalid:
	ret = -EINVAL;
failed:
	softing_enable_irq(card, 0);
	softing_reset_chip(card);
	mutex_unlock(&card->fw.lock);
	/* bring all other interfaces down */
	for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
		netdev = card->net[j];
		if (!netdev)
			continue;
		dev_close(netdev);
	}
	return ret;
}

int softing_default_output(struct net_device *netdev)
{
	struct softing_priv *priv = netdev_priv(netdev);
	struct softing *card = priv->card;

	switch (priv->chip) {
	case 1000:
		return (card->pdat->generation < 2) ? 0xfb : 0xfa;
	case 5:
		return 0x60;
	default:
		return 0x40;
	}
}