summaryrefslogtreecommitdiff
path: root/drivers/net/ethernet/lantiq_etop.c
blob: 62f8c52121822dd26f99954e27d05a48e6ee24fc (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
// SPDX-License-Identifier: GPL-2.0-only
/*
 *
 *   Copyright (C) 2011 John Crispin <blogic@openwrt.org>
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/uaccess.h>
#include <linux/in.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/phy.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/skbuff.h>
#include <linux/mm.h>
#include <linux/platform_device.h>
#include <linux/ethtool.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/dma-mapping.h>
#include <linux/module.h>

#include <asm/checksum.h>

#include <lantiq_soc.h>
#include <xway_dma.h>
#include <lantiq_platform.h>

#define LTQ_ETOP_MDIO		0x11804
#define MDIO_REQUEST		0x80000000
#define MDIO_READ		0x40000000
#define MDIO_ADDR_MASK		0x1f
#define MDIO_ADDR_OFFSET	0x15
#define MDIO_REG_MASK		0x1f
#define MDIO_REG_OFFSET		0x10
#define MDIO_VAL_MASK		0xffff

#define PPE32_CGEN		0x800
#define LQ_PPE32_ENET_MAC_CFG	0x1840

#define LTQ_ETOP_ENETS0		0x11850
#define LTQ_ETOP_MAC_DA0	0x1186C
#define LTQ_ETOP_MAC_DA1	0x11870
#define LTQ_ETOP_CFG		0x16020
#define LTQ_ETOP_IGPLEN		0x16080

#define MAX_DMA_CHAN		0x8
#define MAX_DMA_CRC_LEN		0x4
#define MAX_DMA_DATA_LEN	0x600

#define ETOP_FTCU		BIT(28)
#define ETOP_MII_MASK		0xf
#define ETOP_MII_NORMAL		0xd
#define ETOP_MII_REVERSE	0xe
#define ETOP_PLEN_UNDER		0x40
#define ETOP_CGEN		0x800

/* use 2 static channels for TX/RX */
#define LTQ_ETOP_TX_CHANNEL	1
#define LTQ_ETOP_RX_CHANNEL	6
#define IS_TX(x)		(x == LTQ_ETOP_TX_CHANNEL)
#define IS_RX(x)		(x == LTQ_ETOP_RX_CHANNEL)

#define ltq_etop_r32(x)		ltq_r32(ltq_etop_membase + (x))
#define ltq_etop_w32(x, y)	ltq_w32(x, ltq_etop_membase + (y))
#define ltq_etop_w32_mask(x, y, z)	\
		ltq_w32_mask(x, y, ltq_etop_membase + (z))

#define DRV_VERSION	"1.0"

static void __iomem *ltq_etop_membase;

struct ltq_etop_chan {
	int idx;
	int tx_free;
	struct net_device *netdev;
	struct napi_struct napi;
	struct ltq_dma_channel dma;
	struct sk_buff *skb[LTQ_DESC_NUM];
};

struct ltq_etop_priv {
	struct net_device *netdev;
	struct platform_device *pdev;
	struct ltq_eth_data *pldata;
	struct resource *res;

	struct mii_bus *mii_bus;

	struct ltq_etop_chan ch[MAX_DMA_CHAN];
	int tx_free[MAX_DMA_CHAN >> 1];

	spinlock_t lock;
};

static int
ltq_etop_alloc_skb(struct ltq_etop_chan *ch)
{
	struct ltq_etop_priv *priv = netdev_priv(ch->netdev);

	ch->skb[ch->dma.desc] = netdev_alloc_skb(ch->netdev, MAX_DMA_DATA_LEN);
	if (!ch->skb[ch->dma.desc])
		return -ENOMEM;
	ch->dma.desc_base[ch->dma.desc].addr = dma_map_single(&priv->pdev->dev,
		ch->skb[ch->dma.desc]->data, MAX_DMA_DATA_LEN,
		DMA_FROM_DEVICE);
	ch->dma.desc_base[ch->dma.desc].addr =
		CPHYSADDR(ch->skb[ch->dma.desc]->data);
	ch->dma.desc_base[ch->dma.desc].ctl =
		LTQ_DMA_OWN | LTQ_DMA_RX_OFFSET(NET_IP_ALIGN) |
		MAX_DMA_DATA_LEN;
	skb_reserve(ch->skb[ch->dma.desc], NET_IP_ALIGN);
	return 0;
}

static void
ltq_etop_hw_receive(struct ltq_etop_chan *ch)
{
	struct ltq_etop_priv *priv = netdev_priv(ch->netdev);
	struct ltq_dma_desc *desc = &ch->dma.desc_base[ch->dma.desc];
	struct sk_buff *skb = ch->skb[ch->dma.desc];
	int len = (desc->ctl & LTQ_DMA_SIZE_MASK) - MAX_DMA_CRC_LEN;
	unsigned long flags;

	spin_lock_irqsave(&priv->lock, flags);
	if (ltq_etop_alloc_skb(ch)) {
		netdev_err(ch->netdev,
			"failed to allocate new rx buffer, stopping DMA\n");
		ltq_dma_close(&ch->dma);
	}
	ch->dma.desc++;
	ch->dma.desc %= LTQ_DESC_NUM;
	spin_unlock_irqrestore(&priv->lock, flags);

	skb_put(skb, len);
	skb->protocol = eth_type_trans(skb, ch->netdev);
	netif_receive_skb(skb);
}

static int
ltq_etop_poll_rx(struct napi_struct *napi, int budget)
{
	struct ltq_etop_chan *ch = container_of(napi,
				struct ltq_etop_chan, napi);
	int work_done = 0;

	while (work_done < budget) {
		struct ltq_dma_desc *desc = &ch->dma.desc_base[ch->dma.desc];

		if ((desc->ctl & (LTQ_DMA_OWN | LTQ_DMA_C)) != LTQ_DMA_C)
			break;
		ltq_etop_hw_receive(ch);
		work_done++;
	}
	if (work_done < budget) {
		napi_complete_done(&ch->napi, work_done);
		ltq_dma_ack_irq(&ch->dma);
	}
	return work_done;
}

static int
ltq_etop_poll_tx(struct napi_struct *napi, int budget)
{
	struct ltq_etop_chan *ch =
		container_of(napi, struct ltq_etop_chan, napi);
	struct ltq_etop_priv *priv = netdev_priv(ch->netdev);
	struct netdev_queue *txq =
		netdev_get_tx_queue(ch->netdev, ch->idx >> 1);
	unsigned long flags;

	spin_lock_irqsave(&priv->lock, flags);
	while ((ch->dma.desc_base[ch->tx_free].ctl &
			(LTQ_DMA_OWN | LTQ_DMA_C)) == LTQ_DMA_C) {
		dev_kfree_skb_any(ch->skb[ch->tx_free]);
		ch->skb[ch->tx_free] = NULL;
		memset(&ch->dma.desc_base[ch->tx_free], 0,
			sizeof(struct ltq_dma_desc));
		ch->tx_free++;
		ch->tx_free %= LTQ_DESC_NUM;
	}
	spin_unlock_irqrestore(&priv->lock, flags);

	if (netif_tx_queue_stopped(txq))
		netif_tx_start_queue(txq);
	napi_complete(&ch->napi);
	ltq_dma_ack_irq(&ch->dma);
	return 1;
}

static irqreturn_t
ltq_etop_dma_irq(int irq, void *_priv)
{
	struct ltq_etop_priv *priv = _priv;
	int ch = irq - LTQ_DMA_CH0_INT;

	napi_schedule(&priv->ch[ch].napi);
	return IRQ_HANDLED;
}

static void
ltq_etop_free_channel(struct net_device *dev, struct ltq_etop_chan *ch)
{
	struct ltq_etop_priv *priv = netdev_priv(dev);

	ltq_dma_free(&ch->dma);
	if (ch->dma.irq)
		free_irq(ch->dma.irq, priv);
	if (IS_RX(ch->idx)) {
		int desc;
		for (desc = 0; desc < LTQ_DESC_NUM; desc++)
			dev_kfree_skb_any(ch->skb[ch->dma.desc]);
	}
}

static void
ltq_etop_hw_exit(struct net_device *dev)
{
	struct ltq_etop_priv *priv = netdev_priv(dev);
	int i;

	ltq_pmu_disable(PMU_PPE);
	for (i = 0; i < MAX_DMA_CHAN; i++)
		if (IS_TX(i) || IS_RX(i))
			ltq_etop_free_channel(dev, &priv->ch[i]);
}

static int
ltq_etop_hw_init(struct net_device *dev)
{
	struct ltq_etop_priv *priv = netdev_priv(dev);
	int i;

	ltq_pmu_enable(PMU_PPE);

	switch (priv->pldata->mii_mode) {
	case PHY_INTERFACE_MODE_RMII:
		ltq_etop_w32_mask(ETOP_MII_MASK,
			ETOP_MII_REVERSE, LTQ_ETOP_CFG);
		break;

	case PHY_INTERFACE_MODE_MII:
		ltq_etop_w32_mask(ETOP_MII_MASK,
			ETOP_MII_NORMAL, LTQ_ETOP_CFG);
		break;

	default:
		netdev_err(dev, "unknown mii mode %d\n",
			priv->pldata->mii_mode);
		return -ENOTSUPP;
	}

	/* enable crc generation */
	ltq_etop_w32(PPE32_CGEN, LQ_PPE32_ENET_MAC_CFG);

	ltq_dma_init_port(DMA_PORT_ETOP);

	for (i = 0; i < MAX_DMA_CHAN; i++) {
		int irq = LTQ_DMA_CH0_INT + i;
		struct ltq_etop_chan *ch = &priv->ch[i];

		ch->idx = ch->dma.nr = i;
		ch->dma.dev = &priv->pdev->dev;

		if (IS_TX(i)) {
			ltq_dma_alloc_tx(&ch->dma);
			request_irq(irq, ltq_etop_dma_irq, 0, "etop_tx", priv);
		} else if (IS_RX(i)) {
			ltq_dma_alloc_rx(&ch->dma);
			for (ch->dma.desc = 0; ch->dma.desc < LTQ_DESC_NUM;
					ch->dma.desc++)
				if (ltq_etop_alloc_skb(ch))
					return -ENOMEM;
			ch->dma.desc = 0;
			request_irq(irq, ltq_etop_dma_irq, 0, "etop_rx", priv);
		}
		ch->dma.irq = irq;
	}
	return 0;
}

static void
ltq_etop_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
{
	strlcpy(info->driver, "Lantiq ETOP", sizeof(info->driver));
	strlcpy(info->bus_info, "internal", sizeof(info->bus_info));
	strlcpy(info->version, DRV_VERSION, sizeof(info->version));
}

static const struct ethtool_ops ltq_etop_ethtool_ops = {
	.get_drvinfo = ltq_etop_get_drvinfo,
	.nway_reset = phy_ethtool_nway_reset,
	.get_link_ksettings = phy_ethtool_get_link_ksettings,
	.set_link_ksettings = phy_ethtool_set_link_ksettings,
};

static int
ltq_etop_mdio_wr(struct mii_bus *bus, int phy_addr, int phy_reg, u16 phy_data)
{
	u32 val = MDIO_REQUEST |
		((phy_addr & MDIO_ADDR_MASK) << MDIO_ADDR_OFFSET) |
		((phy_reg & MDIO_REG_MASK) << MDIO_REG_OFFSET) |
		phy_data;

	while (ltq_etop_r32(LTQ_ETOP_MDIO) & MDIO_REQUEST)
		;
	ltq_etop_w32(val, LTQ_ETOP_MDIO);
	return 0;
}

static int
ltq_etop_mdio_rd(struct mii_bus *bus, int phy_addr, int phy_reg)
{
	u32 val = MDIO_REQUEST | MDIO_READ |
		((phy_addr & MDIO_ADDR_MASK) << MDIO_ADDR_OFFSET) |
		((phy_reg & MDIO_REG_MASK) << MDIO_REG_OFFSET);

	while (ltq_etop_r32(LTQ_ETOP_MDIO) & MDIO_REQUEST)
		;
	ltq_etop_w32(val, LTQ_ETOP_MDIO);
	while (ltq_etop_r32(LTQ_ETOP_MDIO) & MDIO_REQUEST)
		;
	val = ltq_etop_r32(LTQ_ETOP_MDIO) & MDIO_VAL_MASK;
	return val;
}

static void
ltq_etop_mdio_link(struct net_device *dev)
{
	/* nothing to do  */
}

static int
ltq_etop_mdio_probe(struct net_device *dev)
{
	struct ltq_etop_priv *priv = netdev_priv(dev);
	struct phy_device *phydev;

	phydev = phy_find_first(priv->mii_bus);

	if (!phydev) {
		netdev_err(dev, "no PHY found\n");
		return -ENODEV;
	}

	phydev = phy_connect(dev, phydev_name(phydev),
			     &ltq_etop_mdio_link, priv->pldata->mii_mode);

	if (IS_ERR(phydev)) {
		netdev_err(dev, "Could not attach to PHY\n");
		return PTR_ERR(phydev);
	}

	phy_set_max_speed(phydev, SPEED_100);

	phy_attached_info(phydev);

	return 0;
}

static int
ltq_etop_mdio_init(struct net_device *dev)
{
	struct ltq_etop_priv *priv = netdev_priv(dev);
	int err;

	priv->mii_bus = mdiobus_alloc();
	if (!priv->mii_bus) {
		netdev_err(dev, "failed to allocate mii bus\n");
		err = -ENOMEM;
		goto err_out;
	}

	priv->mii_bus->priv = dev;
	priv->mii_bus->read = ltq_etop_mdio_rd;
	priv->mii_bus->write = ltq_etop_mdio_wr;
	priv->mii_bus->name = "ltq_mii";
	snprintf(priv->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x",
		priv->pdev->name, priv->pdev->id);
	if (mdiobus_register(priv->mii_bus)) {
		err = -ENXIO;
		goto err_out_free_mdiobus;
	}

	if (ltq_etop_mdio_probe(dev)) {
		err = -ENXIO;
		goto err_out_unregister_bus;
	}
	return 0;

err_out_unregister_bus:
	mdiobus_unregister(priv->mii_bus);
err_out_free_mdiobus:
	mdiobus_free(priv->mii_bus);
err_out:
	return err;
}

static void
ltq_etop_mdio_cleanup(struct net_device *dev)
{
	struct ltq_etop_priv *priv = netdev_priv(dev);

	phy_disconnect(dev->phydev);
	mdiobus_unregister(priv->mii_bus);
	mdiobus_free(priv->mii_bus);
}

static int
ltq_etop_open(struct net_device *dev)
{
	struct ltq_etop_priv *priv = netdev_priv(dev);
	int i;

	for (i = 0; i < MAX_DMA_CHAN; i++) {
		struct ltq_etop_chan *ch = &priv->ch[i];

		if (!IS_TX(i) && (!IS_RX(i)))
			continue;
		ltq_dma_open(&ch->dma);
		ltq_dma_enable_irq(&ch->dma);
		napi_enable(&ch->napi);
	}
	phy_start(dev->phydev);
	netif_tx_start_all_queues(dev);
	return 0;
}

static int
ltq_etop_stop(struct net_device *dev)
{
	struct ltq_etop_priv *priv = netdev_priv(dev);
	int i;

	netif_tx_stop_all_queues(dev);
	phy_stop(dev->phydev);
	for (i = 0; i < MAX_DMA_CHAN; i++) {
		struct ltq_etop_chan *ch = &priv->ch[i];

		if (!IS_RX(i) && !IS_TX(i))
			continue;
		napi_disable(&ch->napi);
		ltq_dma_close(&ch->dma);
	}
	return 0;
}

static int
ltq_etop_tx(struct sk_buff *skb, struct net_device *dev)
{
	int queue = skb_get_queue_mapping(skb);
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue);
	struct ltq_etop_priv *priv = netdev_priv(dev);
	struct ltq_etop_chan *ch = &priv->ch[(queue << 1) | 1];
	struct ltq_dma_desc *desc = &ch->dma.desc_base[ch->dma.desc];
	int len;
	unsigned long flags;
	u32 byte_offset;

	len = skb->len < ETH_ZLEN ? ETH_ZLEN : skb->len;

	if ((desc->ctl & (LTQ_DMA_OWN | LTQ_DMA_C)) || ch->skb[ch->dma.desc]) {
		dev_kfree_skb_any(skb);
		netdev_err(dev, "tx ring full\n");
		netif_tx_stop_queue(txq);
		return NETDEV_TX_BUSY;
	}

	/* dma needs to start on a 16 byte aligned address */
	byte_offset = CPHYSADDR(skb->data) % 16;
	ch->skb[ch->dma.desc] = skb;

	netif_trans_update(dev);

	spin_lock_irqsave(&priv->lock, flags);
	desc->addr = ((unsigned int) dma_map_single(&priv->pdev->dev, skb->data, len,
						DMA_TO_DEVICE)) - byte_offset;
	wmb();
	desc->ctl = LTQ_DMA_OWN | LTQ_DMA_SOP | LTQ_DMA_EOP |
		LTQ_DMA_TX_OFFSET(byte_offset) | (len & LTQ_DMA_SIZE_MASK);
	ch->dma.desc++;
	ch->dma.desc %= LTQ_DESC_NUM;
	spin_unlock_irqrestore(&priv->lock, flags);

	if (ch->dma.desc_base[ch->dma.desc].ctl & LTQ_DMA_OWN)
		netif_tx_stop_queue(txq);

	return NETDEV_TX_OK;
}

static int
ltq_etop_change_mtu(struct net_device *dev, int new_mtu)
{
	struct ltq_etop_priv *priv = netdev_priv(dev);
	unsigned long flags;

	dev->mtu = new_mtu;

	spin_lock_irqsave(&priv->lock, flags);
	ltq_etop_w32((ETOP_PLEN_UNDER << 16) | new_mtu, LTQ_ETOP_IGPLEN);
	spin_unlock_irqrestore(&priv->lock, flags);

	return 0;
}

static int
ltq_etop_set_mac_address(struct net_device *dev, void *p)
{
	int ret = eth_mac_addr(dev, p);

	if (!ret) {
		struct ltq_etop_priv *priv = netdev_priv(dev);
		unsigned long flags;

		/* store the mac for the unicast filter */
		spin_lock_irqsave(&priv->lock, flags);
		ltq_etop_w32(*((u32 *)dev->dev_addr), LTQ_ETOP_MAC_DA0);
		ltq_etop_w32(*((u16 *)&dev->dev_addr[4]) << 16,
			LTQ_ETOP_MAC_DA1);
		spin_unlock_irqrestore(&priv->lock, flags);
	}
	return ret;
}

static void
ltq_etop_set_multicast_list(struct net_device *dev)
{
	struct ltq_etop_priv *priv = netdev_priv(dev);
	unsigned long flags;

	/* ensure that the unicast filter is not enabled in promiscious mode */
	spin_lock_irqsave(&priv->lock, flags);
	if ((dev->flags & IFF_PROMISC) || (dev->flags & IFF_ALLMULTI))
		ltq_etop_w32_mask(ETOP_FTCU, 0, LTQ_ETOP_ENETS0);
	else
		ltq_etop_w32_mask(0, ETOP_FTCU, LTQ_ETOP_ENETS0);
	spin_unlock_irqrestore(&priv->lock, flags);
}

static int
ltq_etop_init(struct net_device *dev)
{
	struct ltq_etop_priv *priv = netdev_priv(dev);
	struct sockaddr mac;
	int err;
	bool random_mac = false;

	dev->watchdog_timeo = 10 * HZ;
	err = ltq_etop_hw_init(dev);
	if (err)
		goto err_hw;
	ltq_etop_change_mtu(dev, 1500);

	memcpy(&mac, &priv->pldata->mac, sizeof(struct sockaddr));
	if (!is_valid_ether_addr(mac.sa_data)) {
		pr_warn("etop: invalid MAC, using random\n");
		eth_random_addr(mac.sa_data);
		random_mac = true;
	}

	err = ltq_etop_set_mac_address(dev, &mac);
	if (err)
		goto err_netdev;

	/* Set addr_assign_type here, ltq_etop_set_mac_address would reset it. */
	if (random_mac)
		dev->addr_assign_type = NET_ADDR_RANDOM;

	ltq_etop_set_multicast_list(dev);
	err = ltq_etop_mdio_init(dev);
	if (err)
		goto err_netdev;
	return 0;

err_netdev:
	unregister_netdev(dev);
	free_netdev(dev);
err_hw:
	ltq_etop_hw_exit(dev);
	return err;
}

static void
ltq_etop_tx_timeout(struct net_device *dev, unsigned int txqueue)
{
	int err;

	ltq_etop_hw_exit(dev);
	err = ltq_etop_hw_init(dev);
	if (err)
		goto err_hw;
	netif_trans_update(dev);
	netif_wake_queue(dev);
	return;

err_hw:
	ltq_etop_hw_exit(dev);
	netdev_err(dev, "failed to restart etop after TX timeout\n");
}

static const struct net_device_ops ltq_eth_netdev_ops = {
	.ndo_open = ltq_etop_open,
	.ndo_stop = ltq_etop_stop,
	.ndo_start_xmit = ltq_etop_tx,
	.ndo_change_mtu = ltq_etop_change_mtu,
	.ndo_eth_ioctl = phy_do_ioctl,
	.ndo_set_mac_address = ltq_etop_set_mac_address,
	.ndo_validate_addr = eth_validate_addr,
	.ndo_set_rx_mode = ltq_etop_set_multicast_list,
	.ndo_select_queue = dev_pick_tx_zero,
	.ndo_init = ltq_etop_init,
	.ndo_tx_timeout = ltq_etop_tx_timeout,
};

static int __init
ltq_etop_probe(struct platform_device *pdev)
{
	struct net_device *dev;
	struct ltq_etop_priv *priv;
	struct resource *res;
	int err;
	int i;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		dev_err(&pdev->dev, "failed to get etop resource\n");
		err = -ENOENT;
		goto err_out;
	}

	res = devm_request_mem_region(&pdev->dev, res->start,
		resource_size(res), dev_name(&pdev->dev));
	if (!res) {
		dev_err(&pdev->dev, "failed to request etop resource\n");
		err = -EBUSY;
		goto err_out;
	}

	ltq_etop_membase = devm_ioremap(&pdev->dev,
		res->start, resource_size(res));
	if (!ltq_etop_membase) {
		dev_err(&pdev->dev, "failed to remap etop engine %d\n",
			pdev->id);
		err = -ENOMEM;
		goto err_out;
	}

	dev = alloc_etherdev_mq(sizeof(struct ltq_etop_priv), 4);
	if (!dev) {
		err = -ENOMEM;
		goto err_out;
	}
	strcpy(dev->name, "eth%d");
	dev->netdev_ops = &ltq_eth_netdev_ops;
	dev->ethtool_ops = &ltq_etop_ethtool_ops;
	priv = netdev_priv(dev);
	priv->res = res;
	priv->pdev = pdev;
	priv->pldata = dev_get_platdata(&pdev->dev);
	priv->netdev = dev;
	spin_lock_init(&priv->lock);
	SET_NETDEV_DEV(dev, &pdev->dev);

	for (i = 0; i < MAX_DMA_CHAN; i++) {
		if (IS_TX(i))
			netif_napi_add(dev, &priv->ch[i].napi,
				ltq_etop_poll_tx, 8);
		else if (IS_RX(i))
			netif_napi_add(dev, &priv->ch[i].napi,
				ltq_etop_poll_rx, 32);
		priv->ch[i].netdev = dev;
	}

	err = register_netdev(dev);
	if (err)
		goto err_free;

	platform_set_drvdata(pdev, dev);
	return 0;

err_free:
	free_netdev(dev);
err_out:
	return err;
}

static int
ltq_etop_remove(struct platform_device *pdev)
{
	struct net_device *dev = platform_get_drvdata(pdev);

	if (dev) {
		netif_tx_stop_all_queues(dev);
		ltq_etop_hw_exit(dev);
		ltq_etop_mdio_cleanup(dev);
		unregister_netdev(dev);
	}
	return 0;
}

static struct platform_driver ltq_mii_driver = {
	.remove = ltq_etop_remove,
	.driver = {
		.name = "ltq_etop",
	},
};

int __init
init_ltq_etop(void)
{
	int ret = platform_driver_probe(&ltq_mii_driver, ltq_etop_probe);

	if (ret)
		pr_err("ltq_etop: Error registering platform driver!");
	return ret;
}

static void __exit
exit_ltq_etop(void)
{
	platform_driver_unregister(&ltq_mii_driver);
}

module_init(init_ltq_etop);
module_exit(exit_ltq_etop);

MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
MODULE_DESCRIPTION("Lantiq SoC ETOP");
MODULE_LICENSE("GPL");