summaryrefslogtreecommitdiffstats
path: root/drivers/net/dsa/xrs700x/xrs700x.c
blob: de3b768f2ff9c0a633d7d1eb294e76f7adbb888a (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
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2020 NovaTech LLC
 * George McCollister <george.mccollister@gmail.com>
 */

#include <net/dsa.h>
#include <linux/etherdevice.h>
#include <linux/if_bridge.h>
#include <linux/of.h>
#include <linux/netdev_features.h>
#include <linux/if_hsr.h>
#include "xrs700x.h"
#include "xrs700x_reg.h"

#define XRS700X_MIB_INTERVAL msecs_to_jiffies(3000)

#define XRS7000X_SUPPORTED_HSR_FEATURES \
	(NETIF_F_HW_HSR_TAG_INS | NETIF_F_HW_HSR_TAG_RM | \
	 NETIF_F_HW_HSR_FWD | NETIF_F_HW_HSR_DUP)

#define XRS7003E_ID	0x100
#define XRS7003F_ID	0x101
#define XRS7004E_ID	0x200
#define XRS7004F_ID	0x201

const struct xrs700x_info xrs7003e_info = {XRS7003E_ID, "XRS7003E", 3};
EXPORT_SYMBOL(xrs7003e_info);

const struct xrs700x_info xrs7003f_info = {XRS7003F_ID, "XRS7003F", 3};
EXPORT_SYMBOL(xrs7003f_info);

const struct xrs700x_info xrs7004e_info = {XRS7004E_ID, "XRS7004E", 4};
EXPORT_SYMBOL(xrs7004e_info);

const struct xrs700x_info xrs7004f_info = {XRS7004F_ID, "XRS7004F", 4};
EXPORT_SYMBOL(xrs7004f_info);

struct xrs700x_regfield {
	struct reg_field rf;
	struct regmap_field **rmf;
};

struct xrs700x_mib {
	unsigned int offset;
	const char *name;
	int stats64_offset;
};

#define XRS700X_MIB_ETHTOOL_ONLY(o, n) {o, n, -1}
#define XRS700X_MIB(o, n, m) {o, n, offsetof(struct rtnl_link_stats64, m)}

static const struct xrs700x_mib xrs700x_mibs[] = {
	XRS700X_MIB(XRS_RX_GOOD_OCTETS_L, "rx_good_octets", rx_bytes),
	XRS700X_MIB_ETHTOOL_ONLY(XRS_RX_BAD_OCTETS_L, "rx_bad_octets"),
	XRS700X_MIB(XRS_RX_UNICAST_L, "rx_unicast", rx_packets),
	XRS700X_MIB(XRS_RX_BROADCAST_L, "rx_broadcast", rx_packets),
	XRS700X_MIB(XRS_RX_MULTICAST_L, "rx_multicast", multicast),
	XRS700X_MIB(XRS_RX_UNDERSIZE_L, "rx_undersize", rx_length_errors),
	XRS700X_MIB(XRS_RX_FRAGMENTS_L, "rx_fragments", rx_length_errors),
	XRS700X_MIB(XRS_RX_OVERSIZE_L, "rx_oversize", rx_length_errors),
	XRS700X_MIB(XRS_RX_JABBER_L, "rx_jabber", rx_length_errors),
	XRS700X_MIB(XRS_RX_ERR_L, "rx_err", rx_errors),
	XRS700X_MIB(XRS_RX_CRC_L, "rx_crc", rx_crc_errors),
	XRS700X_MIB_ETHTOOL_ONLY(XRS_RX_64_L, "rx_64"),
	XRS700X_MIB_ETHTOOL_ONLY(XRS_RX_65_127_L, "rx_65_127"),
	XRS700X_MIB_ETHTOOL_ONLY(XRS_RX_128_255_L, "rx_128_255"),
	XRS700X_MIB_ETHTOOL_ONLY(XRS_RX_256_511_L, "rx_256_511"),
	XRS700X_MIB_ETHTOOL_ONLY(XRS_RX_512_1023_L, "rx_512_1023"),
	XRS700X_MIB_ETHTOOL_ONLY(XRS_RX_1024_1536_L, "rx_1024_1536"),
	XRS700X_MIB_ETHTOOL_ONLY(XRS_RX_HSR_PRP_L, "rx_hsr_prp"),
	XRS700X_MIB_ETHTOOL_ONLY(XRS_RX_WRONGLAN_L, "rx_wronglan"),
	XRS700X_MIB_ETHTOOL_ONLY(XRS_RX_DUPLICATE_L, "rx_duplicate"),
	XRS700X_MIB(XRS_TX_OCTETS_L, "tx_octets", tx_bytes),
	XRS700X_MIB(XRS_TX_UNICAST_L, "tx_unicast", tx_packets),
	XRS700X_MIB(XRS_TX_BROADCAST_L, "tx_broadcast", tx_packets),
	XRS700X_MIB(XRS_TX_MULTICAST_L, "tx_multicast", tx_packets),
	XRS700X_MIB_ETHTOOL_ONLY(XRS_TX_HSR_PRP_L, "tx_hsr_prp"),
	XRS700X_MIB(XRS_PRIQ_DROP_L, "priq_drop", tx_dropped),
	XRS700X_MIB(XRS_EARLY_DROP_L, "early_drop", tx_dropped),
};

static const u8 eth_hsrsup_addr[ETH_ALEN] = {
	0x01, 0x15, 0x4e, 0x00, 0x01, 0x00};

static void xrs700x_get_strings(struct dsa_switch *ds, int port,
				u32 stringset, u8 *data)
{
	int i;

	if (stringset != ETH_SS_STATS)
		return;

	for (i = 0; i < ARRAY_SIZE(xrs700x_mibs); i++) {
		strscpy(data, xrs700x_mibs[i].name, ETH_GSTRING_LEN);
		data += ETH_GSTRING_LEN;
	}
}

static int xrs700x_get_sset_count(struct dsa_switch *ds, int port, int sset)
{
	if (sset != ETH_SS_STATS)
		return -EOPNOTSUPP;

	return ARRAY_SIZE(xrs700x_mibs);
}

static void xrs700x_read_port_counters(struct xrs700x *priv, int port)
{
	struct xrs700x_port *p = &priv->ports[port];
	struct rtnl_link_stats64 stats;
	unsigned long flags;
	int i;

	memset(&stats, 0, sizeof(stats));

	mutex_lock(&p->mib_mutex);

	/* Capture counter values */
	regmap_write(priv->regmap, XRS_CNT_CTRL(port), 1);

	for (i = 0; i < ARRAY_SIZE(xrs700x_mibs); i++) {
		unsigned int high = 0, low = 0, reg;

		reg = xrs700x_mibs[i].offset + XRS_PORT_OFFSET * port;
		regmap_read(priv->regmap, reg, &low);
		regmap_read(priv->regmap, reg + 2, &high);

		p->mib_data[i] += (high << 16) | low;

		if (xrs700x_mibs[i].stats64_offset >= 0) {
			u8 *s = (u8 *)&stats + xrs700x_mibs[i].stats64_offset;
			*(u64 *)s += p->mib_data[i];
		}
	}

	/* multicast must be added to rx_packets (which already includes
	 * unicast and broadcast)
	 */
	stats.rx_packets += stats.multicast;

	flags = u64_stats_update_begin_irqsave(&p->syncp);
	p->stats64 = stats;
	u64_stats_update_end_irqrestore(&p->syncp, flags);

	mutex_unlock(&p->mib_mutex);
}

static void xrs700x_mib_work(struct work_struct *work)
{
	struct xrs700x *priv = container_of(work, struct xrs700x,
					    mib_work.work);
	int i;

	for (i = 0; i < priv->ds->num_ports; i++)
		xrs700x_read_port_counters(priv, i);

	schedule_delayed_work(&priv->mib_work, XRS700X_MIB_INTERVAL);
}

static void xrs700x_get_ethtool_stats(struct dsa_switch *ds, int port,
				      u64 *data)
{
	struct xrs700x *priv = ds->priv;
	struct xrs700x_port *p = &priv->ports[port];

	xrs700x_read_port_counters(priv, port);

	mutex_lock(&p->mib_mutex);
	memcpy(data, p->mib_data, sizeof(*data) * ARRAY_SIZE(xrs700x_mibs));
	mutex_unlock(&p->mib_mutex);
}

static void xrs700x_get_stats64(struct dsa_switch *ds, int port,
				struct rtnl_link_stats64 *s)
{
	struct xrs700x *priv = ds->priv;
	struct xrs700x_port *p = &priv->ports[port];
	unsigned int start;

	do {
		start = u64_stats_fetch_begin(&p->syncp);
		*s = p->stats64;
	} while (u64_stats_fetch_retry(&p->syncp, start));
}

static int xrs700x_setup_regmap_range(struct xrs700x *priv)
{
	struct xrs700x_regfield regfields[] = {
		{
			.rf = REG_FIELD_ID(XRS_PORT_STATE(0), 0, 1,
					   priv->ds->num_ports,
					   XRS_PORT_OFFSET),
			.rmf = &priv->ps_forward
		},
		{
			.rf = REG_FIELD_ID(XRS_PORT_STATE(0), 2, 3,
					   priv->ds->num_ports,
					   XRS_PORT_OFFSET),
			.rmf = &priv->ps_management
		},
		{
			.rf = REG_FIELD_ID(XRS_PORT_STATE(0), 4, 9,
					   priv->ds->num_ports,
					   XRS_PORT_OFFSET),
			.rmf = &priv->ps_sel_speed
		},
		{
			.rf = REG_FIELD_ID(XRS_PORT_STATE(0), 10, 11,
					   priv->ds->num_ports,
					   XRS_PORT_OFFSET),
			.rmf = &priv->ps_cur_speed
		}
	};
	int i = 0;

	for (; i < ARRAY_SIZE(regfields); i++) {
		*regfields[i].rmf = devm_regmap_field_alloc(priv->dev,
							    priv->regmap,
							    regfields[i].rf);
		if (IS_ERR(*regfields[i].rmf))
			return PTR_ERR(*regfields[i].rmf);
	}

	return 0;
}

static enum dsa_tag_protocol xrs700x_get_tag_protocol(struct dsa_switch *ds,
						      int port,
						      enum dsa_tag_protocol m)
{
	return DSA_TAG_PROTO_XRS700X;
}

static int xrs700x_reset(struct dsa_switch *ds)
{
	struct xrs700x *priv = ds->priv;
	unsigned int val;
	int ret;

	ret = regmap_write(priv->regmap, XRS_GENERAL, XRS_GENERAL_RESET);
	if (ret)
		goto error;

	ret = regmap_read_poll_timeout(priv->regmap, XRS_GENERAL,
				       val, !(val & XRS_GENERAL_RESET),
				       10, 1000);
error:
	if (ret) {
		dev_err_ratelimited(priv->dev, "error resetting switch: %d\n",
				    ret);
	}

	return ret;
}

static void xrs700x_port_stp_state_set(struct dsa_switch *ds, int port,
				       u8 state)
{
	struct xrs700x *priv = ds->priv;
	unsigned int bpdus = 1;
	unsigned int val;

	switch (state) {
	case BR_STATE_DISABLED:
		bpdus = 0;
		fallthrough;
	case BR_STATE_BLOCKING:
	case BR_STATE_LISTENING:
		val = XRS_PORT_DISABLED;
		break;
	case BR_STATE_LEARNING:
		val = XRS_PORT_LEARNING;
		break;
	case BR_STATE_FORWARDING:
		val = XRS_PORT_FORWARDING;
		break;
	default:
		dev_err(ds->dev, "invalid STP state: %d\n", state);
		return;
	}

	regmap_fields_write(priv->ps_forward, port, val);

	/* Enable/disable inbound policy added by xrs700x_port_add_bpdu_ipf()
	 * which allows BPDU forwarding to the CPU port when the front facing
	 * port is in disabled/learning state.
	 */
	regmap_update_bits(priv->regmap, XRS_ETH_ADDR_CFG(port, 0), 1, bpdus);

	dev_dbg_ratelimited(priv->dev, "%s - port: %d, state: %u, val: 0x%x\n",
			    __func__, port, state, val);
}

/* Add an inbound policy filter which matches the BPDU destination MAC
 * and forwards to the CPU port. Leave the policy disabled, it will be
 * enabled as needed.
 */
static int xrs700x_port_add_bpdu_ipf(struct dsa_switch *ds, int port)
{
	struct xrs700x *priv = ds->priv;
	unsigned int val = 0;
	int i = 0;
	int ret;

	/* Compare all 48 bits of the destination MAC address. */
	ret = regmap_write(priv->regmap, XRS_ETH_ADDR_CFG(port, 0), 48 << 2);
	if (ret)
		return ret;

	/* match BPDU destination 01:80:c2:00:00:00 */
	for (i = 0; i < sizeof(eth_stp_addr); i += 2) {
		ret = regmap_write(priv->regmap, XRS_ETH_ADDR_0(port, 0) + i,
				   eth_stp_addr[i] |
				   (eth_stp_addr[i + 1] << 8));
		if (ret)
			return ret;
	}

	/* Mirror BPDU to CPU port */
	for (i = 0; i < ds->num_ports; i++) {
		if (dsa_is_cpu_port(ds, i))
			val |= BIT(i);
	}

	ret = regmap_write(priv->regmap, XRS_ETH_ADDR_FWD_MIRROR(port, 0), val);
	if (ret)
		return ret;

	ret = regmap_write(priv->regmap, XRS_ETH_ADDR_FWD_ALLOW(port, 0), 0);
	if (ret)
		return ret;

	return 0;
}

/* Add an inbound policy filter which matches the HSR/PRP supervision MAC
 * range and forwards to the CPU port without discarding duplicates.
 * This is required to correctly populate the HSR/PRP node_table.
 * Leave the policy disabled, it will be enabled as needed.
 */
static int xrs700x_port_add_hsrsup_ipf(struct dsa_switch *ds, int port,
				       int fwdport)
{
	struct xrs700x *priv = ds->priv;
	unsigned int val = 0;
	int i = 0;
	int ret;

	/* Compare 40 bits of the destination MAC address. */
	ret = regmap_write(priv->regmap, XRS_ETH_ADDR_CFG(port, 1), 40 << 2);
	if (ret)
		return ret;

	/* match HSR/PRP supervision destination 01:15:4e:00:01:XX */
	for (i = 0; i < sizeof(eth_hsrsup_addr); i += 2) {
		ret = regmap_write(priv->regmap, XRS_ETH_ADDR_0(port, 1) + i,
				   eth_hsrsup_addr[i] |
				   (eth_hsrsup_addr[i + 1] << 8));
		if (ret)
			return ret;
	}

	/* Mirror HSR/PRP supervision to CPU port */
	for (i = 0; i < ds->num_ports; i++) {
		if (dsa_is_cpu_port(ds, i))
			val |= BIT(i);
	}

	ret = regmap_write(priv->regmap, XRS_ETH_ADDR_FWD_MIRROR(port, 1), val);
	if (ret)
		return ret;

	if (fwdport >= 0)
		val |= BIT(fwdport);

	/* Allow must be set prevent duplicate discard */
	ret = regmap_write(priv->regmap, XRS_ETH_ADDR_FWD_ALLOW(port, 1), val);
	if (ret)
		return ret;

	return 0;
}

static int xrs700x_port_setup(struct dsa_switch *ds, int port)
{
	bool cpu_port = dsa_is_cpu_port(ds, port);
	struct xrs700x *priv = ds->priv;
	unsigned int val = 0;
	int ret, i;

	xrs700x_port_stp_state_set(ds, port, BR_STATE_DISABLED);

	/* Disable forwarding to non-CPU ports */
	for (i = 0; i < ds->num_ports; i++) {
		if (!dsa_is_cpu_port(ds, i))
			val |= BIT(i);
	}

	/* 1 = Disable forwarding to the port */
	ret = regmap_write(priv->regmap, XRS_PORT_FWD_MASK(port), val);
	if (ret)
		return ret;

	val = cpu_port ? XRS_PORT_MODE_MANAGEMENT : XRS_PORT_MODE_NORMAL;
	ret = regmap_fields_write(priv->ps_management, port, val);
	if (ret)
		return ret;

	if (!cpu_port) {
		ret = xrs700x_port_add_bpdu_ipf(ds, port);
		if (ret)
			return ret;
	}

	return 0;
}

static int xrs700x_setup(struct dsa_switch *ds)
{
	struct xrs700x *priv = ds->priv;
	int ret, i;

	ret = xrs700x_reset(ds);
	if (ret)
		return ret;

	for (i = 0; i < ds->num_ports; i++) {
		ret = xrs700x_port_setup(ds, i);
		if (ret)
			return ret;
	}

	schedule_delayed_work(&priv->mib_work, XRS700X_MIB_INTERVAL);

	return 0;
}

static void xrs700x_teardown(struct dsa_switch *ds)
{
	struct xrs700x *priv = ds->priv;

	cancel_delayed_work_sync(&priv->mib_work);
}

static void xrs700x_phylink_get_caps(struct dsa_switch *ds, int port,
				     struct phylink_config *config)
{
	switch (port) {
	case 0:
		__set_bit(PHY_INTERFACE_MODE_RMII,
			  config->supported_interfaces);
		config->mac_capabilities = MAC_10FD | MAC_100FD;
		break;

	case 1:
	case 2:
	case 3:
		phy_interface_set_rgmii(config->supported_interfaces);
		config->mac_capabilities = MAC_10FD | MAC_100FD | MAC_1000FD;
		break;

	default:
		dev_err(ds->dev, "Unsupported port: %i\n", port);
		break;
	}
}

static void xrs700x_mac_config(struct phylink_config *config, unsigned int mode,
			       const struct phylink_link_state *state)
{
}

static void xrs700x_mac_link_down(struct phylink_config *config,
				  unsigned int mode, phy_interface_t interface)
{
}

static void xrs700x_mac_link_up(struct phylink_config *config,
				struct phy_device *phydev,
				unsigned int mode, phy_interface_t interface,
				int speed, int duplex,
				bool tx_pause, bool rx_pause)
{
	struct dsa_port *dp = dsa_phylink_to_port(config);
	struct xrs700x *priv = dp->ds->priv;
	int port = dp->index;
	unsigned int val;

	switch (speed) {
	case SPEED_1000:
		val = XRS_PORT_SPEED_1000;
		break;
	case SPEED_100:
		val = XRS_PORT_SPEED_100;
		break;
	case SPEED_10:
		val = XRS_PORT_SPEED_10;
		break;
	default:
		return;
	}

	regmap_fields_write(priv->ps_sel_speed, port, val);

	dev_dbg_ratelimited(priv->dev, "%s: port: %d mode: %u speed: %u\n",
			    __func__, port, mode, speed);
}

static int xrs700x_bridge_common(struct dsa_switch *ds, int port,
				 struct dsa_bridge bridge, bool join)
{
	unsigned int i, cpu_mask = 0, mask = 0;
	struct xrs700x *priv = ds->priv;
	int ret;

	for (i = 0; i < ds->num_ports; i++) {
		if (dsa_is_cpu_port(ds, i))
			continue;

		cpu_mask |= BIT(i);

		if (dsa_port_offloads_bridge(dsa_to_port(ds, i), &bridge))
			continue;

		mask |= BIT(i);
	}

	for (i = 0; i < ds->num_ports; i++) {
		if (!dsa_port_offloads_bridge(dsa_to_port(ds, i), &bridge))
			continue;

		/* 1 = Disable forwarding to the port */
		ret = regmap_write(priv->regmap, XRS_PORT_FWD_MASK(i), mask);
		if (ret)
			return ret;
	}

	if (!join) {
		ret = regmap_write(priv->regmap, XRS_PORT_FWD_MASK(port),
				   cpu_mask);
		if (ret)
			return ret;
	}

	return 0;
}

static int xrs700x_bridge_join(struct dsa_switch *ds, int port,
			       struct dsa_bridge bridge, bool *tx_fwd_offload,
			       struct netlink_ext_ack *extack)
{
	return xrs700x_bridge_common(ds, port, bridge, true);
}

static void xrs700x_bridge_leave(struct dsa_switch *ds, int port,
				 struct dsa_bridge bridge)
{
	xrs700x_bridge_common(ds, port, bridge, false);
}

static int xrs700x_hsr_join(struct dsa_switch *ds, int port,
			    struct net_device *hsr,
			    struct netlink_ext_ack *extack)
{
	unsigned int val = XRS_HSR_CFG_HSR_PRP;
	struct dsa_port *partner = NULL, *dp;
	struct xrs700x *priv = ds->priv;
	struct net_device *user;
	int ret, i, hsr_pair[2];
	enum hsr_version ver;
	bool fwd = false;

	ret = hsr_get_version(hsr, &ver);
	if (ret)
		return ret;

	if (port != 1 && port != 2) {
		NL_SET_ERR_MSG_MOD(extack,
				   "Only ports 1 and 2 can offload HSR/PRP");
		return -EOPNOTSUPP;
	}

	if (ver == HSR_V1) {
		val |= XRS_HSR_CFG_HSR;
	} else if (ver == PRP_V1) {
		val |= XRS_HSR_CFG_PRP;
	} else {
		NL_SET_ERR_MSG_MOD(extack,
				   "Only HSR v1 and PRP v1 can be offloaded");
		return -EOPNOTSUPP;
	}

	dsa_hsr_foreach_port(dp, ds, hsr) {
		if (dp->index != port) {
			partner = dp;
			break;
		}
	}

	/* We can't enable redundancy on the switch until both
	 * redundant ports have signed up.
	 */
	if (!partner)
		return 0;

	regmap_fields_write(priv->ps_forward, partner->index,
			    XRS_PORT_DISABLED);
	regmap_fields_write(priv->ps_forward, port, XRS_PORT_DISABLED);

	regmap_write(priv->regmap, XRS_HSR_CFG(partner->index),
		     val | XRS_HSR_CFG_LANID_A);
	regmap_write(priv->regmap, XRS_HSR_CFG(port),
		     val | XRS_HSR_CFG_LANID_B);

	/* Clear bits for both redundant ports (HSR only) and the CPU port to
	 * enable forwarding.
	 */
	val = GENMASK(ds->num_ports - 1, 0);
	if (ver == HSR_V1) {
		val &= ~BIT(partner->index);
		val &= ~BIT(port);
		fwd = true;
	}
	val &= ~BIT(dsa_upstream_port(ds, port));
	regmap_write(priv->regmap, XRS_PORT_FWD_MASK(partner->index), val);
	regmap_write(priv->regmap, XRS_PORT_FWD_MASK(port), val);

	regmap_fields_write(priv->ps_forward, partner->index,
			    XRS_PORT_FORWARDING);
	regmap_fields_write(priv->ps_forward, port, XRS_PORT_FORWARDING);

	/* Enable inbound policy which allows HSR/PRP supervision forwarding
	 * to the CPU port without discarding duplicates. Continue to
	 * forward to redundant ports when in HSR mode while discarding
	 * duplicates.
	 */
	ret = xrs700x_port_add_hsrsup_ipf(ds, partner->index, fwd ? port : -1);
	if (ret)
		return ret;

	ret = xrs700x_port_add_hsrsup_ipf(ds, port, fwd ? partner->index : -1);
	if (ret)
		return ret;

	regmap_update_bits(priv->regmap,
			   XRS_ETH_ADDR_CFG(partner->index, 1), 1, 1);
	regmap_update_bits(priv->regmap, XRS_ETH_ADDR_CFG(port, 1), 1, 1);

	hsr_pair[0] = port;
	hsr_pair[1] = partner->index;
	for (i = 0; i < ARRAY_SIZE(hsr_pair); i++) {
		user = dsa_to_port(ds, hsr_pair[i])->user;
		user->features |= XRS7000X_SUPPORTED_HSR_FEATURES;
	}

	return 0;
}

static int xrs700x_hsr_leave(struct dsa_switch *ds, int port,
			     struct net_device *hsr)
{
	struct dsa_port *partner = NULL, *dp;
	struct xrs700x *priv = ds->priv;
	struct net_device *user;
	int i, hsr_pair[2];
	unsigned int val;

	dsa_hsr_foreach_port(dp, ds, hsr) {
		if (dp->index != port) {
			partner = dp;
			break;
		}
	}

	if (!partner)
		return 0;

	regmap_fields_write(priv->ps_forward, partner->index,
			    XRS_PORT_DISABLED);
	regmap_fields_write(priv->ps_forward, port, XRS_PORT_DISABLED);

	regmap_write(priv->regmap, XRS_HSR_CFG(partner->index), 0);
	regmap_write(priv->regmap, XRS_HSR_CFG(port), 0);

	/* Clear bit for the CPU port to enable forwarding. */
	val = GENMASK(ds->num_ports - 1, 0);
	val &= ~BIT(dsa_upstream_port(ds, port));
	regmap_write(priv->regmap, XRS_PORT_FWD_MASK(partner->index), val);
	regmap_write(priv->regmap, XRS_PORT_FWD_MASK(port), val);

	regmap_fields_write(priv->ps_forward, partner->index,
			    XRS_PORT_FORWARDING);
	regmap_fields_write(priv->ps_forward, port, XRS_PORT_FORWARDING);

	/* Disable inbound policy added by xrs700x_port_add_hsrsup_ipf()
	 * which allows HSR/PRP supervision forwarding to the CPU port without
	 * discarding duplicates.
	 */
	regmap_update_bits(priv->regmap,
			   XRS_ETH_ADDR_CFG(partner->index, 1), 1, 0);
	regmap_update_bits(priv->regmap, XRS_ETH_ADDR_CFG(port, 1), 1, 0);

	hsr_pair[0] = port;
	hsr_pair[1] = partner->index;
	for (i = 0; i < ARRAY_SIZE(hsr_pair); i++) {
		user = dsa_to_port(ds, hsr_pair[i])->user;
		user->features &= ~XRS7000X_SUPPORTED_HSR_FEATURES;
	}

	return 0;
}

static const struct phylink_mac_ops xrs700x_phylink_mac_ops = {
	.mac_config		= xrs700x_mac_config,
	.mac_link_down		= xrs700x_mac_link_down,
	.mac_link_up		= xrs700x_mac_link_up,
};

static const struct dsa_switch_ops xrs700x_ops = {
	.get_tag_protocol	= xrs700x_get_tag_protocol,
	.setup			= xrs700x_setup,
	.teardown		= xrs700x_teardown,
	.port_stp_state_set	= xrs700x_port_stp_state_set,
	.phylink_get_caps	= xrs700x_phylink_get_caps,
	.get_strings		= xrs700x_get_strings,
	.get_sset_count		= xrs700x_get_sset_count,
	.get_ethtool_stats	= xrs700x_get_ethtool_stats,
	.get_stats64		= xrs700x_get_stats64,
	.port_bridge_join	= xrs700x_bridge_join,
	.port_bridge_leave	= xrs700x_bridge_leave,
	.port_hsr_join		= xrs700x_hsr_join,
	.port_hsr_leave		= xrs700x_hsr_leave,
};

static int xrs700x_detect(struct xrs700x *priv)
{
	const struct xrs700x_info *info;
	unsigned int id;
	int ret;

	ret = regmap_read(priv->regmap, XRS_DEV_ID0, &id);
	if (ret) {
		dev_err(priv->dev, "error %d while reading switch id.\n",
			ret);
		return ret;
	}

	info = of_device_get_match_data(priv->dev);
	if (!info)
		return -EINVAL;

	if (info->id == id) {
		priv->ds->num_ports = info->num_ports;
		dev_info(priv->dev, "%s detected.\n", info->name);
		return 0;
	}

	dev_err(priv->dev, "expected switch id 0x%x but found 0x%x.\n",
		info->id, id);

	return -ENODEV;
}

struct xrs700x *xrs700x_switch_alloc(struct device *base, void *devpriv)
{
	struct dsa_switch *ds;
	struct xrs700x *priv;

	ds = devm_kzalloc(base, sizeof(*ds), GFP_KERNEL);
	if (!ds)
		return NULL;

	ds->dev = base;

	priv = devm_kzalloc(base, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return NULL;

	INIT_DELAYED_WORK(&priv->mib_work, xrs700x_mib_work);

	ds->ops = &xrs700x_ops;
	ds->phylink_mac_ops = &xrs700x_phylink_mac_ops;
	ds->priv = priv;
	priv->dev = base;

	priv->ds = ds;
	priv->priv = devpriv;

	return priv;
}
EXPORT_SYMBOL(xrs700x_switch_alloc);

static int xrs700x_alloc_port_mib(struct xrs700x *priv, int port)
{
	struct xrs700x_port *p = &priv->ports[port];

	p->mib_data = devm_kcalloc(priv->dev, ARRAY_SIZE(xrs700x_mibs),
				   sizeof(*p->mib_data), GFP_KERNEL);
	if (!p->mib_data)
		return -ENOMEM;

	mutex_init(&p->mib_mutex);
	u64_stats_init(&p->syncp);

	return 0;
}

int xrs700x_switch_register(struct xrs700x *priv)
{
	int ret;
	int i;

	ret = xrs700x_detect(priv);
	if (ret)
		return ret;

	ret = xrs700x_setup_regmap_range(priv);
	if (ret)
		return ret;

	priv->ports = devm_kcalloc(priv->dev, priv->ds->num_ports,
				   sizeof(*priv->ports), GFP_KERNEL);
	if (!priv->ports)
		return -ENOMEM;

	for (i = 0; i < priv->ds->num_ports; i++) {
		ret = xrs700x_alloc_port_mib(priv, i);
		if (ret)
			return ret;
	}

	return dsa_register_switch(priv->ds);
}
EXPORT_SYMBOL(xrs700x_switch_register);

void xrs700x_switch_remove(struct xrs700x *priv)
{
	dsa_unregister_switch(priv->ds);
}
EXPORT_SYMBOL(xrs700x_switch_remove);

void xrs700x_switch_shutdown(struct xrs700x *priv)
{
	dsa_switch_shutdown(priv->ds);
}
EXPORT_SYMBOL(xrs700x_switch_shutdown);

MODULE_AUTHOR("George McCollister <george.mccollister@gmail.com>");
MODULE_DESCRIPTION("Arrow SpeedChips XRS700x DSA driver");
MODULE_LICENSE("GPL v2");