aboutsummaryrefslogtreecommitdiff
path: root/drivers/net/ethernet/sfc/mtd.c
blob: 08f825b71ac8c5a69db6995fda028626e702adae (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
693
694
695
/****************************************************************************
 * Driver for Solarflare Solarstorm network controllers and boards
 * Copyright 2005-2006 Fen Systems Ltd.
 * Copyright 2006-2010 Solarflare Communications Inc.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published
 * by the Free Software Foundation, incorporated herein by reference.
 */

#include <linux/bitops.h>
#include <linux/module.h>
#include <linux/mtd/mtd.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/rtnetlink.h>

#include "net_driver.h"
#include "spi.h"
#include "efx.h"
#include "nic.h"
#include "mcdi.h"
#include "mcdi_pcol.h"

#define EFX_SPI_VERIFY_BUF_LEN 16

struct efx_mtd_partition {
	struct mtd_info mtd;
	union {
		struct {
			bool updating;
			u8 nvram_type;
			u16 fw_subtype;
		} mcdi;
		size_t offset;
	};
	const char *type_name;
	char name[IFNAMSIZ + 20];
};

struct efx_mtd_ops {
	int (*read)(struct mtd_info *mtd, loff_t start, size_t len,
		    size_t *retlen, u8 *buffer);
	int (*erase)(struct mtd_info *mtd, loff_t start, size_t len);
	int (*write)(struct mtd_info *mtd, loff_t start, size_t len,
		     size_t *retlen, const u8 *buffer);
	int (*sync)(struct mtd_info *mtd);
};

struct efx_mtd {
	struct list_head node;
	struct efx_nic *efx;
	const struct efx_spi_device *spi;
	const char *name;
	const struct efx_mtd_ops *ops;
	size_t n_parts;
	struct efx_mtd_partition part[0];
};

#define efx_for_each_partition(part, efx_mtd)			\
	for ((part) = &(efx_mtd)->part[0];			\
	     (part) != &(efx_mtd)->part[(efx_mtd)->n_parts];	\
	     (part)++)

#define to_efx_mtd_partition(mtd)				\
	container_of(mtd, struct efx_mtd_partition, mtd)

static int falcon_mtd_probe(struct efx_nic *efx);
static int siena_mtd_probe(struct efx_nic *efx);

/* SPI utilities */

static int
efx_spi_slow_wait(struct efx_mtd_partition *part, bool uninterruptible)
{
	struct efx_mtd *efx_mtd = part->mtd.priv;
	const struct efx_spi_device *spi = efx_mtd->spi;
	struct efx_nic *efx = efx_mtd->efx;
	u8 status;
	int rc, i;

	/* Wait up to 4s for flash/EEPROM to finish a slow operation. */
	for (i = 0; i < 40; i++) {
		__set_current_state(uninterruptible ?
				    TASK_UNINTERRUPTIBLE : TASK_INTERRUPTIBLE);
		schedule_timeout(HZ / 10);
		rc = falcon_spi_cmd(efx, spi, SPI_RDSR, -1, NULL,
				    &status, sizeof(status));
		if (rc)
			return rc;
		if (!(status & SPI_STATUS_NRDY))
			return 0;
		if (signal_pending(current))
			return -EINTR;
	}
	pr_err("%s: timed out waiting for %s\n", part->name, efx_mtd->name);
	return -ETIMEDOUT;
}

static int
efx_spi_unlock(struct efx_nic *efx, const struct efx_spi_device *spi)
{
	const u8 unlock_mask = (SPI_STATUS_BP2 | SPI_STATUS_BP1 |
				SPI_STATUS_BP0);
	u8 status;
	int rc;

	rc = falcon_spi_cmd(efx, spi, SPI_RDSR, -1, NULL,
			    &status, sizeof(status));
	if (rc)
		return rc;

	if (!(status & unlock_mask))
		return 0; /* already unlocked */

	rc = falcon_spi_cmd(efx, spi, SPI_WREN, -1, NULL, NULL, 0);
	if (rc)
		return rc;
	rc = falcon_spi_cmd(efx, spi, SPI_SST_EWSR, -1, NULL, NULL, 0);
	if (rc)
		return rc;

	status &= ~unlock_mask;
	rc = falcon_spi_cmd(efx, spi, SPI_WRSR, -1, &status,
			    NULL, sizeof(status));
	if (rc)
		return rc;
	rc = falcon_spi_wait_write(efx, spi);
	if (rc)
		return rc;

	return 0;
}

static int
efx_spi_erase(struct efx_mtd_partition *part, loff_t start, size_t len)
{
	struct efx_mtd *efx_mtd = part->mtd.priv;
	const struct efx_spi_device *spi = efx_mtd->spi;
	struct efx_nic *efx = efx_mtd->efx;
	unsigned pos, block_len;
	u8 empty[EFX_SPI_VERIFY_BUF_LEN];
	u8 buffer[EFX_SPI_VERIFY_BUF_LEN];
	int rc;

	if (len != spi->erase_size)
		return -EINVAL;

	if (spi->erase_command == 0)
		return -EOPNOTSUPP;

	rc = efx_spi_unlock(efx, spi);
	if (rc)
		return rc;
	rc = falcon_spi_cmd(efx, spi, SPI_WREN, -1, NULL, NULL, 0);
	if (rc)
		return rc;
	rc = falcon_spi_cmd(efx, spi, spi->erase_command, start, NULL,
			    NULL, 0);
	if (rc)
		return rc;
	rc = efx_spi_slow_wait(part, false);

	/* Verify the entire region has been wiped */
	memset(empty, 0xff, sizeof(empty));
	for (pos = 0; pos < len; pos += block_len) {
		block_len = min(len - pos, sizeof(buffer));
		rc = falcon_spi_read(efx, spi, start + pos, block_len,
				     NULL, buffer);
		if (rc)
			return rc;
		if (memcmp(empty, buffer, block_len))
			return -EIO;

		/* Avoid locking up the system */
		cond_resched();
		if (signal_pending(current))
			return -EINTR;
	}

	return rc;
}

/* MTD interface */

static int efx_mtd_erase(struct mtd_info *mtd, struct erase_info *erase)
{
	struct efx_mtd *efx_mtd = mtd->priv;
	int rc;

	rc = efx_mtd->ops->erase(mtd, erase->addr, erase->len);
	if (rc == 0) {
		erase->state = MTD_ERASE_DONE;
	} else {
		erase->state = MTD_ERASE_FAILED;
		erase->fail_addr = MTD_FAIL_ADDR_UNKNOWN;
	}
	mtd_erase_callback(erase);
	return rc;
}

static void efx_mtd_sync(struct mtd_info *mtd)
{
	struct efx_mtd_partition *part = to_efx_mtd_partition(mtd);
	struct efx_mtd *efx_mtd = mtd->priv;
	int rc;

	rc = efx_mtd->ops->sync(mtd);
	if (rc)
		pr_err("%s: %s sync failed (%d)\n",
		       part->name, efx_mtd->name, rc);
}

static void efx_mtd_remove_partition(struct efx_mtd_partition *part)
{
	int rc;

	for (;;) {
		rc = mtd_device_unregister(&part->mtd);
		if (rc != -EBUSY)
			break;
		ssleep(1);
	}
	WARN_ON(rc);
}

static void efx_mtd_remove_device(struct efx_mtd *efx_mtd)
{
	struct efx_mtd_partition *part;

	efx_for_each_partition(part, efx_mtd)
		efx_mtd_remove_partition(part);
	list_del(&efx_mtd->node);
	kfree(efx_mtd);
}

static void efx_mtd_rename_device(struct efx_mtd *efx_mtd)
{
	struct efx_mtd_partition *part;

	efx_for_each_partition(part, efx_mtd)
		if (efx_nic_rev(efx_mtd->efx) >= EFX_REV_SIENA_A0)
			snprintf(part->name, sizeof(part->name),
				 "%s %s:%02x", efx_mtd->efx->name,
				 part->type_name, part->mcdi.fw_subtype);
		else
			snprintf(part->name, sizeof(part->name),
				 "%s %s", efx_mtd->efx->name,
				 part->type_name);
}

static int efx_mtd_probe_device(struct efx_nic *efx, struct efx_mtd *efx_mtd)
{
	struct efx_mtd_partition *part;

	efx_mtd->efx = efx;

	efx_mtd_rename_device(efx_mtd);

	efx_for_each_partition(part, efx_mtd) {
		part->mtd.writesize = 1;

		part->mtd.owner = THIS_MODULE;
		part->mtd.priv = efx_mtd;
		part->mtd.name = part->name;
		part->mtd._erase = efx_mtd_erase;
		part->mtd._read = efx_mtd->ops->read;
		part->mtd._write = efx_mtd->ops->write;
		part->mtd._sync = efx_mtd_sync;

		if (mtd_device_register(&part->mtd, NULL, 0))
			goto fail;
	}

	list_add(&efx_mtd->node, &efx->mtd_list);
	return 0;

fail:
	while (part != &efx_mtd->part[0]) {
		--part;
		efx_mtd_remove_partition(part);
	}
	/* Failure is unlikely here, but probably means we're out of memory */
	return -ENOMEM;
}

void efx_mtd_remove(struct efx_nic *efx)
{
	struct efx_mtd *efx_mtd, *next;

	WARN_ON(efx_dev_registered(efx));

	list_for_each_entry_safe(efx_mtd, next, &efx->mtd_list, node)
		efx_mtd_remove_device(efx_mtd);
}

void efx_mtd_rename(struct efx_nic *efx)
{
	struct efx_mtd *efx_mtd;

	ASSERT_RTNL();

	list_for_each_entry(efx_mtd, &efx->mtd_list, node)
		efx_mtd_rename_device(efx_mtd);
}

int efx_mtd_probe(struct efx_nic *efx)
{
	if (efx_nic_rev(efx) >= EFX_REV_SIENA_A0)
		return siena_mtd_probe(efx);
	else
		return falcon_mtd_probe(efx);
}

/* Implementation of MTD operations for Falcon */

static int falcon_mtd_read(struct mtd_info *mtd, loff_t start,
			   size_t len, size_t *retlen, u8 *buffer)
{
	struct efx_mtd_partition *part = to_efx_mtd_partition(mtd);
	struct efx_mtd *efx_mtd = mtd->priv;
	const struct efx_spi_device *spi = efx_mtd->spi;
	struct efx_nic *efx = efx_mtd->efx;
	struct falcon_nic_data *nic_data = efx->nic_data;
	int rc;

	rc = mutex_lock_interruptible(&nic_data->spi_lock);
	if (rc)
		return rc;
	rc = falcon_spi_read(efx, spi, part->offset + start, len,
			     retlen, buffer);
	mutex_unlock(&nic_data->spi_lock);
	return rc;
}

static int falcon_mtd_erase(struct mtd_info *mtd, loff_t start, size_t len)
{
	struct efx_mtd_partition *part = to_efx_mtd_partition(mtd);
	struct efx_mtd *efx_mtd = mtd->priv;
	struct efx_nic *efx = efx_mtd->efx;
	struct falcon_nic_data *nic_data = efx->nic_data;
	int rc;

	rc = mutex_lock_interruptible(&nic_data->spi_lock);
	if (rc)
		return rc;
	rc = efx_spi_erase(part, part->offset + start, len);
	mutex_unlock(&nic_data->spi_lock);
	return rc;
}

static int falcon_mtd_write(struct mtd_info *mtd, loff_t start,
			    size_t len, size_t *retlen, const u8 *buffer)
{
	struct efx_mtd_partition *part = to_efx_mtd_partition(mtd);
	struct efx_mtd *efx_mtd = mtd->priv;
	const struct efx_spi_device *spi = efx_mtd->spi;
	struct efx_nic *efx = efx_mtd->efx;
	struct falcon_nic_data *nic_data = efx->nic_data;
	int rc;

	rc = mutex_lock_interruptible(&nic_data->spi_lock);
	if (rc)
		return rc;
	rc = falcon_spi_write(efx, spi, part->offset + start, len,
			      retlen, buffer);
	mutex_unlock(&nic_data->spi_lock);
	return rc;
}

static int falcon_mtd_sync(struct mtd_info *mtd)
{
	struct efx_mtd_partition *part = to_efx_mtd_partition(mtd);
	struct efx_mtd *efx_mtd = mtd->priv;
	struct efx_nic *efx = efx_mtd->efx;
	struct falcon_nic_data *nic_data = efx->nic_data;
	int rc;

	mutex_lock(&nic_data->spi_lock);
	rc = efx_spi_slow_wait(part, true);
	mutex_unlock(&nic_data->spi_lock);
	return rc;
}

static const struct efx_mtd_ops falcon_mtd_ops = {
	.read	= falcon_mtd_read,
	.erase	= falcon_mtd_erase,
	.write	= falcon_mtd_write,
	.sync	= falcon_mtd_sync,
};

static int falcon_mtd_probe(struct efx_nic *efx)
{
	struct falcon_nic_data *nic_data = efx->nic_data;
	struct efx_spi_device *spi;
	struct efx_mtd *efx_mtd;
	int rc = -ENODEV;

	ASSERT_RTNL();

	spi = &nic_data->spi_flash;
	if (efx_spi_present(spi) && spi->size > FALCON_FLASH_BOOTCODE_START) {
		efx_mtd = kzalloc(sizeof(*efx_mtd) + sizeof(efx_mtd->part[0]),
				  GFP_KERNEL);
		if (!efx_mtd)
			return -ENOMEM;

		efx_mtd->spi = spi;
		efx_mtd->name = "flash";
		efx_mtd->ops = &falcon_mtd_ops;

		efx_mtd->n_parts = 1;
		efx_mtd->part[0].mtd.type = MTD_NORFLASH;
		efx_mtd->part[0].mtd.flags = MTD_CAP_NORFLASH;
		efx_mtd->part[0].mtd.size = spi->size - FALCON_FLASH_BOOTCODE_START;
		efx_mtd->part[0].mtd.erasesize = spi->erase_size;
		efx_mtd->part[0].offset = FALCON_FLASH_BOOTCODE_START;
		efx_mtd->part[0].type_name = "sfc_flash_bootrom";

		rc = efx_mtd_probe_device(efx, efx_mtd);
		if (rc) {
			kfree(efx_mtd);
			return rc;
		}
	}

	spi = &nic_data->spi_eeprom;
	if (efx_spi_present(spi) && spi->size > EFX_EEPROM_BOOTCONFIG_START) {
		efx_mtd = kzalloc(sizeof(*efx_mtd) + sizeof(efx_mtd->part[0]),
				  GFP_KERNEL);
		if (!efx_mtd)
			return -ENOMEM;

		efx_mtd->spi = spi;
		efx_mtd->name = "EEPROM";
		efx_mtd->ops = &falcon_mtd_ops;

		efx_mtd->n_parts = 1;
		efx_mtd->part[0].mtd.type = MTD_RAM;
		efx_mtd->part[0].mtd.flags = MTD_CAP_RAM;
		efx_mtd->part[0].mtd.size =
			min(spi->size, EFX_EEPROM_BOOTCONFIG_END) -
			EFX_EEPROM_BOOTCONFIG_START;
		efx_mtd->part[0].mtd.erasesize = spi->erase_size;
		efx_mtd->part[0].offset = EFX_EEPROM_BOOTCONFIG_START;
		efx_mtd->part[0].type_name = "sfc_bootconfig";

		rc = efx_mtd_probe_device(efx, efx_mtd);
		if (rc) {
			kfree(efx_mtd);
			return rc;
		}
	}

	return rc;
}

/* Implementation of MTD operations for Siena */

static int siena_mtd_read(struct mtd_info *mtd, loff_t start,
			  size_t len, size_t *retlen, u8 *buffer)
{
	struct efx_mtd_partition *part = to_efx_mtd_partition(mtd);
	struct efx_mtd *efx_mtd = mtd->priv;
	struct efx_nic *efx = efx_mtd->efx;
	loff_t offset = start;
	loff_t end = min_t(loff_t, start + len, mtd->size);
	size_t chunk;
	int rc = 0;

	while (offset < end) {
		chunk = min_t(size_t, end - offset, EFX_MCDI_NVRAM_LEN_MAX);
		rc = efx_mcdi_nvram_read(efx, part->mcdi.nvram_type, offset,
					 buffer, chunk);
		if (rc)
			goto out;
		offset += chunk;
		buffer += chunk;
	}
out:
	*retlen = offset - start;
	return rc;
}

static int siena_mtd_erase(struct mtd_info *mtd, loff_t start, size_t len)
{
	struct efx_mtd_partition *part = to_efx_mtd_partition(mtd);
	struct efx_mtd *efx_mtd = mtd->priv;
	struct efx_nic *efx = efx_mtd->efx;
	loff_t offset = start & ~((loff_t)(mtd->erasesize - 1));
	loff_t end = min_t(loff_t, start + len, mtd->size);
	size_t chunk = part->mtd.erasesize;
	int rc = 0;

	if (!part->mcdi.updating) {
		rc = efx_mcdi_nvram_update_start(efx, part->mcdi.nvram_type);
		if (rc)
			goto out;
		part->mcdi.updating = true;
	}

	/* The MCDI interface can in fact do multiple erase blocks at once;
	 * but erasing may be slow, so we make multiple calls here to avoid
	 * tripping the MCDI RPC timeout. */
	while (offset < end) {
		rc = efx_mcdi_nvram_erase(efx, part->mcdi.nvram_type, offset,
					  chunk);
		if (rc)
			goto out;
		offset += chunk;
	}
out:
	return rc;
}

static int siena_mtd_write(struct mtd_info *mtd, loff_t start,
			   size_t len, size_t *retlen, const u8 *buffer)
{
	struct efx_mtd_partition *part = to_efx_mtd_partition(mtd);
	struct efx_mtd *efx_mtd = mtd->priv;
	struct efx_nic *efx = efx_mtd->efx;
	loff_t offset = start;
	loff_t end = min_t(loff_t, start + len, mtd->size);
	size_t chunk;
	int rc = 0;

	if (!part->mcdi.updating) {
		rc = efx_mcdi_nvram_update_start(efx, part->mcdi.nvram_type);
		if (rc)
			goto out;
		part->mcdi.updating = true;
	}

	while (offset < end) {
		chunk = min_t(size_t, end - offset, EFX_MCDI_NVRAM_LEN_MAX);
		rc = efx_mcdi_nvram_write(efx, part->mcdi.nvram_type, offset,
					  buffer, chunk);
		if (rc)
			goto out;
		offset += chunk;
		buffer += chunk;
	}
out:
	*retlen = offset - start;
	return rc;
}

static int siena_mtd_sync(struct mtd_info *mtd)
{
	struct efx_mtd_partition *part = to_efx_mtd_partition(mtd);
	struct efx_mtd *efx_mtd = mtd->priv;
	struct efx_nic *efx = efx_mtd->efx;
	int rc = 0;

	if (part->mcdi.updating) {
		part->mcdi.updating = false;
		rc = efx_mcdi_nvram_update_finish(efx, part->mcdi.nvram_type);
	}

	return rc;
}

static const struct efx_mtd_ops siena_mtd_ops = {
	.read	= siena_mtd_read,
	.erase	= siena_mtd_erase,
	.write	= siena_mtd_write,
	.sync	= siena_mtd_sync,
};

struct siena_nvram_type_info {
	int port;
	const char *name;
};

static const struct siena_nvram_type_info siena_nvram_types[] = {
	[MC_CMD_NVRAM_TYPE_DISABLED_CALLISTO]	= { 0, "sfc_dummy_phy" },
	[MC_CMD_NVRAM_TYPE_MC_FW]		= { 0, "sfc_mcfw" },
	[MC_CMD_NVRAM_TYPE_MC_FW_BACKUP]	= { 0, "sfc_mcfw_backup" },
	[MC_CMD_NVRAM_TYPE_STATIC_CFG_PORT0]	= { 0, "sfc_static_cfg" },
	[MC_CMD_NVRAM_TYPE_STATIC_CFG_PORT1]	= { 1, "sfc_static_cfg" },
	[MC_CMD_NVRAM_TYPE_DYNAMIC_CFG_PORT0]	= { 0, "sfc_dynamic_cfg" },
	[MC_CMD_NVRAM_TYPE_DYNAMIC_CFG_PORT1]	= { 1, "sfc_dynamic_cfg" },
	[MC_CMD_NVRAM_TYPE_EXP_ROM]		= { 0, "sfc_exp_rom" },
	[MC_CMD_NVRAM_TYPE_EXP_ROM_CFG_PORT0]	= { 0, "sfc_exp_rom_cfg" },
	[MC_CMD_NVRAM_TYPE_EXP_ROM_CFG_PORT1]	= { 1, "sfc_exp_rom_cfg" },
	[MC_CMD_NVRAM_TYPE_PHY_PORT0]		= { 0, "sfc_phy_fw" },
	[MC_CMD_NVRAM_TYPE_PHY_PORT1]		= { 1, "sfc_phy_fw" },
	[MC_CMD_NVRAM_TYPE_FPGA]		= { 0, "sfc_fpga" },
};

static int siena_mtd_probe_partition(struct efx_nic *efx,
				     struct efx_mtd *efx_mtd,
				     unsigned int part_id,
				     unsigned int type)
{
	struct efx_mtd_partition *part = &efx_mtd->part[part_id];
	const struct siena_nvram_type_info *info;
	size_t size, erase_size;
	bool protected;
	int rc;

	if (type >= ARRAY_SIZE(siena_nvram_types) ||
	    siena_nvram_types[type].name == NULL)
		return -ENODEV;

	info = &siena_nvram_types[type];

	if (info->port != efx_port_num(efx))
		return -ENODEV;

	rc = efx_mcdi_nvram_info(efx, type, &size, &erase_size, &protected);
	if (rc)
		return rc;
	if (protected)
		return -ENODEV; /* hide it */

	part->mcdi.nvram_type = type;
	part->type_name = info->name;

	part->mtd.type = MTD_NORFLASH;
	part->mtd.flags = MTD_CAP_NORFLASH;
	part->mtd.size = size;
	part->mtd.erasesize = erase_size;

	return 0;
}

static int siena_mtd_get_fw_subtypes(struct efx_nic *efx,
				     struct efx_mtd *efx_mtd)
{
	struct efx_mtd_partition *part;
	uint16_t fw_subtype_list[
		MC_CMD_GET_BOARD_CFG_OUT_FW_SUBTYPE_LIST_MAXNUM];
	int rc;

	rc = efx_mcdi_get_board_cfg(efx, NULL, fw_subtype_list, NULL);
	if (rc)
		return rc;

	efx_for_each_partition(part, efx_mtd)
		part->mcdi.fw_subtype = fw_subtype_list[part->mcdi.nvram_type];

	return 0;
}

static int siena_mtd_probe(struct efx_nic *efx)
{
	struct efx_mtd *efx_mtd;
	int rc = -ENODEV;
	u32 nvram_types;
	unsigned int type;

	ASSERT_RTNL();

	rc = efx_mcdi_nvram_types(efx, &nvram_types);
	if (rc)
		return rc;

	efx_mtd = kzalloc(sizeof(*efx_mtd) +
			  hweight32(nvram_types) * sizeof(efx_mtd->part[0]),
			  GFP_KERNEL);
	if (!efx_mtd)
		return -ENOMEM;

	efx_mtd->name = "Siena NVRAM manager";

	efx_mtd->ops = &siena_mtd_ops;

	type = 0;
	efx_mtd->n_parts = 0;

	while (nvram_types != 0) {
		if (nvram_types & 1) {
			rc = siena_mtd_probe_partition(efx, efx_mtd,
						       efx_mtd->n_parts, type);
			if (rc == 0)
				efx_mtd->n_parts++;
			else if (rc != -ENODEV)
				goto fail;
		}
		type++;
		nvram_types >>= 1;
	}

	rc = siena_mtd_get_fw_subtypes(efx, efx_mtd);
	if (rc)
		goto fail;

	rc = efx_mtd_probe_device(efx, efx_mtd);
fail:
	if (rc)
		kfree(efx_mtd);
	return rc;
}