aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/net/ll_temac_main.c
blob: f2a197fd47a5fd2bbd6d5d3a5a35fe4d7c16d05b (plain) (blame)
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
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
/*
 * Driver for Xilinx TEMAC Ethernet device
 *
 * Copyright (c) 2008 Nissin Systems Co., Ltd.,  Yoshio Kashiwagi
 * Copyright (c) 2005-2008 DLA Systems,  David H. Lynch Jr. <dhlii@dlasys.net>
 * Copyright (c) 2008-2009 Secret Lab Technologies Ltd.
 *
 * This is a driver for the Xilinx ll_temac ipcore which is often used
 * in the Virtex and Spartan series of chips.
 *
 * Notes:
 * - The ll_temac hardware uses indirect access for many of the TEMAC
 *   registers, include the MDIO bus.  However, indirect access to MDIO
 *   registers take considerably more clock cycles than to TEMAC registers.
 *   MDIO accesses are long, so threads doing them should probably sleep
 *   rather than busywait.  However, since only one indirect access can be
 *   in progress at any given time, that means that *all* indirect accesses
 *   could end up sleeping (to wait for an MDIO access to complete).
 *   Fortunately none of the indirect accesses are on the 'hot' path for tx
 *   or rx, so this should be okay.
 *
 * TODO:
 * - Fix driver to work on more than just Virtex5.  Right now the driver
 *   assumes that the locallink DMA registers are accessed via DCR
 *   instructions.
 * - Factor out locallink DMA code into separate driver
 * - Fix multicast assignment.
 * - Fix support for hardware checksumming.
 * - Testing.  Lots and lots of testing.
 *
 */

#include <linux/delay.h>
#include <linux/etherdevice.h>
#include <linux/init.h>
#include <linux/mii.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/netdevice.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_mdio.h>
#include <linux/of_platform.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/tcp.h>      /* needed for sizeof(tcphdr) */
#include <linux/udp.h>      /* needed for sizeof(udphdr) */
#include <linux/phy.h>
#include <linux/in.h>
#include <linux/io.h>
#include <linux/ip.h>

#include "ll_temac.h"

#define TX_BD_NUM   64
#define RX_BD_NUM   128

/* ---------------------------------------------------------------------
 * Low level register access functions
 */

u32 temac_ior(struct temac_local *lp, int offset)
{
	return in_be32((u32 *)(lp->regs + offset));
}

void temac_iow(struct temac_local *lp, int offset, u32 value)
{
	out_be32((u32 *) (lp->regs + offset), value);
}

int temac_indirect_busywait(struct temac_local *lp)
{
	long end = jiffies + 2;

	while (!(temac_ior(lp, XTE_RDY0_OFFSET) & XTE_RDY0_HARD_ACS_RDY_MASK)) {
		if (end - jiffies <= 0) {
			WARN_ON(1);
			return -ETIMEDOUT;
		}
		msleep(1);
	}
	return 0;
}

/**
 * temac_indirect_in32
 *
 * lp->indirect_mutex must be held when calling this function
 */
u32 temac_indirect_in32(struct temac_local *lp, int reg)
{
	u32 val;

	if (temac_indirect_busywait(lp))
		return -ETIMEDOUT;
	temac_iow(lp, XTE_CTL0_OFFSET, reg);
	if (temac_indirect_busywait(lp))
		return -ETIMEDOUT;
	val = temac_ior(lp, XTE_LSW0_OFFSET);

	return val;
}

/**
 * temac_indirect_out32
 *
 * lp->indirect_mutex must be held when calling this function
 */
void temac_indirect_out32(struct temac_local *lp, int reg, u32 value)
{
	if (temac_indirect_busywait(lp))
		return;
	temac_iow(lp, XTE_LSW0_OFFSET, value);
	temac_iow(lp, XTE_CTL0_OFFSET, CNTLREG_WRITE_ENABLE_MASK | reg);
}

static u32 temac_dma_in32(struct temac_local *lp, int reg)
{
	return dcr_read(lp->sdma_dcrs, reg);
}

static void temac_dma_out32(struct temac_local *lp, int reg, u32 value)
{
	dcr_write(lp->sdma_dcrs, reg, value);
}

/**
 * temac_dma_bd_init - Setup buffer descriptor rings
 */
static int temac_dma_bd_init(struct net_device *ndev)
{
	struct temac_local *lp = netdev_priv(ndev);
	struct sk_buff *skb;
	int i;

	lp->rx_skb = kzalloc(sizeof(struct sk_buff)*RX_BD_NUM, GFP_KERNEL);
	/* allocate the tx and rx ring buffer descriptors. */
	/* returns a virtual addres and a physical address. */
	lp->tx_bd_v = dma_alloc_coherent(ndev->dev.parent,
					 sizeof(*lp->tx_bd_v) * TX_BD_NUM,
					 &lp->tx_bd_p, GFP_KERNEL);
	lp->rx_bd_v = dma_alloc_coherent(ndev->dev.parent,
					 sizeof(*lp->rx_bd_v) * RX_BD_NUM,
					 &lp->rx_bd_p, GFP_KERNEL);

	memset(lp->tx_bd_v, 0, sizeof(*lp->tx_bd_v) * TX_BD_NUM);
	for (i = 0; i < TX_BD_NUM; i++) {
		lp->tx_bd_v[i].next = lp->tx_bd_p +
				sizeof(*lp->tx_bd_v) * ((i + 1) % TX_BD_NUM);
	}

	memset(lp->rx_bd_v, 0, sizeof(*lp->rx_bd_v) * RX_BD_NUM);
	for (i = 0; i < RX_BD_NUM; i++) {
		lp->rx_bd_v[i].next = lp->rx_bd_p +
				sizeof(*lp->rx_bd_v) * ((i + 1) % RX_BD_NUM);

		skb = alloc_skb(XTE_MAX_JUMBO_FRAME_SIZE
				+ XTE_ALIGN, GFP_ATOMIC);
		if (skb == 0) {
			dev_err(&ndev->dev, "alloc_skb error %d\n", i);
			return -1;
		}
		lp->rx_skb[i] = skb;
		skb_reserve(skb,  BUFFER_ALIGN(skb->data));
		/* returns physical address of skb->data */
		lp->rx_bd_v[i].phys = dma_map_single(ndev->dev.parent,
						     skb->data,
						     XTE_MAX_JUMBO_FRAME_SIZE,
						     DMA_FROM_DEVICE);
		lp->rx_bd_v[i].len = XTE_MAX_JUMBO_FRAME_SIZE;
		lp->rx_bd_v[i].app0 = STS_CTRL_APP0_IRQONEND;
	}

	temac_dma_out32(lp, TX_CHNL_CTRL, 0x10220400 |
					  CHNL_CTRL_IRQ_EN |
					  CHNL_CTRL_IRQ_DLY_EN |
					  CHNL_CTRL_IRQ_COAL_EN);
	/* 0x10220483 */
	/* 0x00100483 */
	temac_dma_out32(lp, RX_CHNL_CTRL, 0xff010000 |
					  CHNL_CTRL_IRQ_EN |
					  CHNL_CTRL_IRQ_DLY_EN |
					  CHNL_CTRL_IRQ_COAL_EN |
					  CHNL_CTRL_IRQ_IOE);
	/* 0xff010283 */

	temac_dma_out32(lp, RX_CURDESC_PTR,  lp->rx_bd_p);
	temac_dma_out32(lp, RX_TAILDESC_PTR,
		       lp->rx_bd_p + (sizeof(*lp->rx_bd_v) * (RX_BD_NUM - 1)));
	temac_dma_out32(lp, TX_CURDESC_PTR, lp->tx_bd_p);

	return 0;
}

/* ---------------------------------------------------------------------
 * net_device_ops
 */

static int temac_set_mac_address(struct net_device *ndev, void *address)
{
	struct temac_local *lp = netdev_priv(ndev);

	if (address)
		memcpy(ndev->dev_addr, address, ETH_ALEN);

	if (!is_valid_ether_addr(ndev->dev_addr))
		random_ether_addr(ndev->dev_addr);

	/* set up unicast MAC address filter set its mac address */
	mutex_lock(&lp->indirect_mutex);
	temac_indirect_out32(lp, XTE_UAW0_OFFSET,
			     (ndev->dev_addr[0]) |
			     (ndev->dev_addr[1] << 8) |
			     (ndev->dev_addr[2] << 16) |
			     (ndev->dev_addr[3] << 24));
	/* There are reserved bits in EUAW1
	 * so don't affect them Set MAC bits [47:32] in EUAW1 */
	temac_indirect_out32(lp, XTE_UAW1_OFFSET,
			     (ndev->dev_addr[4] & 0x000000ff) |
			     (ndev->dev_addr[5] << 8));
	mutex_unlock(&lp->indirect_mutex);

	return 0;
}

static void temac_set_multicast_list(struct net_device *ndev)
{
	struct temac_local *lp = netdev_priv(ndev);
	u32 multi_addr_msw, multi_addr_lsw, val;
	int i;

	mutex_lock(&lp->indirect_mutex);
	if (ndev->flags & (IFF_ALLMULTI | IFF_PROMISC)
			|| ndev->mc_count > MULTICAST_CAM_TABLE_NUM) {
		/*
		 *	We must make the kernel realise we had to move
		 *	into promisc mode or we start all out war on
		 *	the cable. If it was a promisc request the
		 *	flag is already set. If not we assert it.
		 */
		ndev->flags |= IFF_PROMISC;
		temac_indirect_out32(lp, XTE_AFM_OFFSET, XTE_AFM_EPPRM_MASK);
		dev_info(&ndev->dev, "Promiscuous mode enabled.\n");
	} else if (ndev->mc_count) {
		struct dev_mc_list *mclist = ndev->mc_list;
		for (i = 0; mclist && i < ndev->mc_count; i++) {

			if (i >= MULTICAST_CAM_TABLE_NUM)
				break;
			multi_addr_msw = ((mclist->dmi_addr[3] << 24) |
					  (mclist->dmi_addr[2] << 16) |
					  (mclist->dmi_addr[1] << 8) |
					  (mclist->dmi_addr[0]));
			temac_indirect_out32(lp, XTE_MAW0_OFFSET,
					     multi_addr_msw);
			multi_addr_lsw = ((mclist->dmi_addr[5] << 8) |
					  (mclist->dmi_addr[4]) | (i << 16));
			temac_indirect_out32(lp, XTE_MAW1_OFFSET,
					     multi_addr_lsw);
			mclist = mclist->next;
		}
	} else {
		val = temac_indirect_in32(lp, XTE_AFM_OFFSET);
		temac_indirect_out32(lp, XTE_AFM_OFFSET,
				     val & ~XTE_AFM_EPPRM_MASK);
		temac_indirect_out32(lp, XTE_MAW0_OFFSET, 0);
		temac_indirect_out32(lp, XTE_MAW1_OFFSET, 0);
		dev_info(&ndev->dev, "Promiscuous mode disabled.\n");
	}
	mutex_unlock(&lp->indirect_mutex);
}

struct temac_option {
	int flg;
	u32 opt;
	u32 reg;
	u32 m_or;
	u32 m_and;
} temac_options[] = {
	/* Turn on jumbo packet support for both Rx and Tx */
	{
		.opt = XTE_OPTION_JUMBO,
		.reg = XTE_TXC_OFFSET,
		.m_or = XTE_TXC_TXJMBO_MASK,
	},
	{
		.opt = XTE_OPTION_JUMBO,
		.reg = XTE_RXC1_OFFSET,
		.m_or =XTE_RXC1_RXJMBO_MASK,
	},
	/* Turn on VLAN packet support for both Rx and Tx */
	{
		.opt = XTE_OPTION_VLAN,
		.reg = XTE_TXC_OFFSET,
		.m_or =XTE_TXC_TXVLAN_MASK,
	},
	{
		.opt = XTE_OPTION_VLAN,
		.reg = XTE_RXC1_OFFSET,
		.m_or =XTE_RXC1_RXVLAN_MASK,
	},
	/* Turn on FCS stripping on receive packets */
	{
		.opt = XTE_OPTION_FCS_STRIP,
		.reg = XTE_RXC1_OFFSET,
		.m_or =XTE_RXC1_RXFCS_MASK,
	},
	/* Turn on FCS insertion on transmit packets */
	{
		.opt = XTE_OPTION_FCS_INSERT,
		.reg = XTE_TXC_OFFSET,
		.m_or =XTE_TXC_TXFCS_MASK,
	},
	/* Turn on length/type field checking on receive packets */
	{
		.opt = XTE_OPTION_LENTYPE_ERR,
		.reg = XTE_RXC1_OFFSET,
		.m_or =XTE_RXC1_RXLT_MASK,
	},
	/* Turn on flow control */
	{
		.opt = XTE_OPTION_FLOW_CONTROL,
		.reg = XTE_FCC_OFFSET,
		.m_or =XTE_FCC_RXFLO_MASK,
	},
	/* Turn on flow control */
	{
		.opt = XTE_OPTION_FLOW_CONTROL,
		.reg = XTE_FCC_OFFSET,
		.m_or =XTE_FCC_TXFLO_MASK,
	},
	/* Turn on promiscuous frame filtering (all frames are received ) */
	{
		.opt = XTE_OPTION_PROMISC,
		.reg = XTE_AFM_OFFSET,
		.m_or =XTE_AFM_EPPRM_MASK,
	},
	/* Enable transmitter if not already enabled */
	{
		.opt = XTE_OPTION_TXEN,
		.reg = XTE_TXC_OFFSET,
		.m_or =XTE_TXC_TXEN_MASK,
	},
	/* Enable receiver? */
	{
		.opt = XTE_OPTION_RXEN,
		.reg = XTE_RXC1_OFFSET,
		.m_or =XTE_RXC1_RXEN_MASK,
	},
	{}
};

/**
 * temac_setoptions
 */
static u32 temac_setoptions(struct net_device *ndev, u32 options)
{
	struct temac_local *lp = netdev_priv(ndev);
	struct temac_option *tp = &temac_options[0];
	int reg;

	mutex_lock(&lp->indirect_mutex);
	while (tp->opt) {
		reg = temac_indirect_in32(lp, tp->reg) & ~tp->m_or;
		if (options & tp->opt)
			reg |= tp->m_or;
		temac_indirect_out32(lp, tp->reg, reg);
		tp++;
	}
	lp->options |= options;
	mutex_unlock(&lp->indirect_mutex);

	return (0);
}

/* Initilize temac */
static void temac_device_reset(struct net_device *ndev)
{
	struct temac_local *lp = netdev_priv(ndev);
	u32 timeout;
	u32 val;

	/* Perform a software reset */

	/* 0x300 host enable bit ? */
	/* reset PHY through control register ?:1 */

	dev_dbg(&ndev->dev, "%s()\n", __func__);

	mutex_lock(&lp->indirect_mutex);
	/* Reset the receiver and wait for it to finish reset */
	temac_indirect_out32(lp, XTE_RXC1_OFFSET, XTE_RXC1_RXRST_MASK);
	timeout = 1000;
	while (temac_indirect_in32(lp, XTE_RXC1_OFFSET) & XTE_RXC1_RXRST_MASK) {
		udelay(1);
		if (--timeout == 0) {
			dev_err(&ndev->dev,
				"temac_device_reset RX reset timeout!!\n");
			break;
		}
	}

	/* Reset the transmitter and wait for it to finish reset */
	temac_indirect_out32(lp, XTE_TXC_OFFSET, XTE_TXC_TXRST_MASK);
	timeout = 1000;
	while (temac_indirect_in32(lp, XTE_TXC_OFFSET) & XTE_TXC_TXRST_MASK) {
		udelay(1);
		if (--timeout == 0) {
			dev_err(&ndev->dev,
				"temac_device_reset TX reset timeout!!\n");
			break;
		}
	}

	/* Disable the receiver */
	val = temac_indirect_in32(lp, XTE_RXC1_OFFSET);
	temac_indirect_out32(lp, XTE_RXC1_OFFSET, val & ~XTE_RXC1_RXEN_MASK);

	/* Reset Local Link (DMA) */
	temac_dma_out32(lp, DMA_CONTROL_REG, DMA_CONTROL_RST);
	timeout = 1000;
	while (temac_dma_in32(lp, DMA_CONTROL_REG) & DMA_CONTROL_RST) {
		udelay(1);
		if (--timeout == 0) {
			dev_err(&ndev->dev,
				"temac_device_reset DMA reset timeout!!\n");
			break;
		}
	}
	temac_dma_out32(lp, DMA_CONTROL_REG, DMA_TAIL_ENABLE);

	temac_dma_bd_init(ndev);

	temac_indirect_out32(lp, XTE_RXC0_OFFSET, 0);
	temac_indirect_out32(lp, XTE_RXC1_OFFSET, 0);
	temac_indirect_out32(lp, XTE_TXC_OFFSET, 0);
	temac_indirect_out32(lp, XTE_FCC_OFFSET, XTE_FCC_RXFLO_MASK);

	mutex_unlock(&lp->indirect_mutex);

	/* Sync default options with HW
	 * but leave receiver and transmitter disabled.  */
	temac_setoptions(ndev,
			 lp->options & ~(XTE_OPTION_TXEN | XTE_OPTION_RXEN));

	temac_set_mac_address(ndev, NULL);

	/* Set address filter table */
	temac_set_multicast_list(ndev);
	if (temac_setoptions(ndev, lp->options))
		dev_err(&ndev->dev, "Error setting TEMAC options\n");

	/* Init Driver variable */
	ndev->trans_start = 0;
}

void temac_adjust_link(struct net_device *ndev)
{
	struct temac_local *lp = netdev_priv(ndev);
	struct phy_device *phy = lp->phy_dev;
	u32 mii_speed;
	int link_state;

	/* hash together the state values to decide if something has changed */
	link_state = phy->speed | (phy->duplex << 1) | phy->link;

	mutex_lock(&lp->indirect_mutex);
	if (lp->last_link != link_state) {
		mii_speed = temac_indirect_in32(lp, XTE_EMCFG_OFFSET);
		mii_speed &= ~XTE_EMCFG_LINKSPD_MASK;

		switch (phy->speed) {
		case SPEED_1000: mii_speed |= XTE_EMCFG_LINKSPD_1000; break;
		case SPEED_100: mii_speed |= XTE_EMCFG_LINKSPD_100; break;
		case SPEED_10: mii_speed |= XTE_EMCFG_LINKSPD_10; break;
		}

		/* Write new speed setting out to TEMAC */
		temac_indirect_out32(lp, XTE_EMCFG_OFFSET, mii_speed);
		lp->last_link = link_state;
		phy_print_status(phy);
	}
	mutex_unlock(&lp->indirect_mutex);
}

static void temac_start_xmit_done(struct net_device *ndev)
{
	struct temac_local *lp = netdev_priv(ndev);
	struct cdmac_bd *cur_p;
	unsigned int stat = 0;

	cur_p = &lp->tx_bd_v[lp->tx_bd_ci];
	stat = cur_p->app0;

	while (stat & STS_CTRL_APP0_CMPLT) {
		dma_unmap_single(ndev->dev.parent, cur_p->phys, cur_p->len,
				 DMA_TO_DEVICE);
		if (cur_p->app4)
			dev_kfree_skb_irq((struct sk_buff *)cur_p->app4);
		cur_p->app0 = 0;

		ndev->stats.tx_packets++;
		ndev->stats.tx_bytes += cur_p->len;

		lp->tx_bd_ci++;
		if (lp->tx_bd_ci >= TX_BD_NUM)
			lp->tx_bd_ci = 0;

		cur_p = &lp->tx_bd_v[lp->tx_bd_ci];
		stat = cur_p->app0;
	}

	netif_wake_queue(ndev);
}

static int temac_start_xmit(struct sk_buff *skb, struct net_device *ndev)
{
	struct temac_local *lp = netdev_priv(ndev);
	struct cdmac_bd *cur_p;
	dma_addr_t start_p, tail_p;
	int ii;
	unsigned long num_frag;
	skb_frag_t *frag;

	num_frag = skb_shinfo(skb)->nr_frags;
	frag = &skb_shinfo(skb)->frags[0];
	start_p = lp->tx_bd_p + sizeof(*lp->tx_bd_v) * lp->tx_bd_tail;
	cur_p = &lp->tx_bd_v[lp->tx_bd_tail];

	if (cur_p->app0 & STS_CTRL_APP0_CMPLT) {
		if (!netif_queue_stopped(ndev)) {
			netif_stop_queue(ndev);
			return NETDEV_TX_BUSY;
		}
		return NETDEV_TX_BUSY;
	}

	cur_p->app0 = 0;
	if (skb->ip_summed == CHECKSUM_PARTIAL) {
		const struct iphdr *ip = ip_hdr(skb);
		int length = 0, start = 0, insert = 0;

		switch (ip->protocol) {
		case IPPROTO_TCP:
			start = sizeof(struct iphdr) + ETH_HLEN;
			insert = sizeof(struct iphdr) + ETH_HLEN + 16;
			length = ip->tot_len - sizeof(struct iphdr);
			break;
		case IPPROTO_UDP:
			start = sizeof(struct iphdr) + ETH_HLEN;
			insert = sizeof(struct iphdr) + ETH_HLEN + 6;
			length = ip->tot_len - sizeof(struct iphdr);
			break;
		default:
			break;
		}
		cur_p->app1 = ((start << 16) | insert);
		cur_p->app2 = csum_tcpudp_magic(ip->saddr, ip->daddr,
						length, ip->protocol, 0);
		skb->data[insert] = 0;
		skb->data[insert + 1] = 0;
	}
	cur_p->app0 |= STS_CTRL_APP0_SOP;
	cur_p->len = skb_headlen(skb);
	cur_p->phys = dma_map_single(ndev->dev.parent, skb->data, skb->len,
				     DMA_TO_DEVICE);
	cur_p->app4 = (unsigned long)skb;

	for (ii = 0; ii < num_frag; ii++) {
		lp->tx_bd_tail++;
		if (lp->tx_bd_tail >= TX_BD_NUM)
			lp->tx_bd_tail = 0;

		cur_p = &lp->tx_bd_v[lp->tx_bd_tail];
		cur_p->phys = dma_map_single(ndev->dev.parent,
					     (void *)page_address(frag->page) +
					          frag->page_offset,
					     frag->size, DMA_TO_DEVICE);
		cur_p->len = frag->size;
		cur_p->app0 = 0;
		frag++;
	}
	cur_p->app0 |= STS_CTRL_APP0_EOP;

	tail_p = lp->tx_bd_p + sizeof(*lp->tx_bd_v) * lp->tx_bd_tail;
	lp->tx_bd_tail++;
	if (lp->tx_bd_tail >= TX_BD_NUM)
		lp->tx_bd_tail = 0;

	/* Kick off the transfer */
	temac_dma_out32(lp, TX_TAILDESC_PTR, tail_p); /* DMA start */

	return NETDEV_TX_OK;
}


static void ll_temac_recv(struct net_device *ndev)
{
	struct temac_local *lp = netdev_priv(ndev);
	struct sk_buff *skb, *new_skb;
	unsigned int bdstat;
	struct cdmac_bd *cur_p;
	dma_addr_t tail_p;
	int length;
	unsigned long skb_vaddr;
	unsigned long flags;

	spin_lock_irqsave(&lp->rx_lock, flags);

	tail_p = lp->rx_bd_p + sizeof(*lp->rx_bd_v) * lp->rx_bd_ci;
	cur_p = &lp->rx_bd_v[lp->rx_bd_ci];

	bdstat = cur_p->app0;
	while ((bdstat & STS_CTRL_APP0_CMPLT)) {

		skb = lp->rx_skb[lp->rx_bd_ci];
		length = cur_p->app4;

		skb_vaddr = virt_to_bus(skb->data);
		dma_unmap_single(ndev->dev.parent, skb_vaddr, length,
				 DMA_FROM_DEVICE);

		skb_put(skb, length);
		skb->dev = ndev;
		skb->protocol = eth_type_trans(skb, ndev);
		skb->ip_summed = CHECKSUM_NONE;

		netif_rx(skb);

		ndev->stats.rx_packets++;
		ndev->stats.rx_bytes += length;

		new_skb = alloc_skb(XTE_MAX_JUMBO_FRAME_SIZE + XTE_ALIGN,
				GFP_ATOMIC);
		if (new_skb == 0) {
			dev_err(&ndev->dev, "no memory for new sk_buff\n");
			spin_unlock_irqrestore(&lp->rx_lock, flags);
			return;
		}

		skb_reserve(new_skb, BUFFER_ALIGN(new_skb->data));

		cur_p->app0 = STS_CTRL_APP0_IRQONEND;
		cur_p->phys = dma_map_single(ndev->dev.parent, new_skb->data,
					     XTE_MAX_JUMBO_FRAME_SIZE,
					     DMA_FROM_DEVICE);
		cur_p->len = XTE_MAX_JUMBO_FRAME_SIZE;
		lp->rx_skb[lp->rx_bd_ci] = new_skb;

		lp->rx_bd_ci++;
		if (lp->rx_bd_ci >= RX_BD_NUM)
			lp->rx_bd_ci = 0;

		cur_p = &lp->rx_bd_v[lp->rx_bd_ci];
		bdstat = cur_p->app0;
	}
	temac_dma_out32(lp, RX_TAILDESC_PTR, tail_p);

	spin_unlock_irqrestore(&lp->rx_lock, flags);
}

static irqreturn_t ll_temac_tx_irq(int irq, void *_ndev)
{
	struct net_device *ndev = _ndev;
	struct temac_local *lp = netdev_priv(ndev);
	unsigned int status;

	status = temac_dma_in32(lp, TX_IRQ_REG);
	temac_dma_out32(lp, TX_IRQ_REG, status);

	if (status & (IRQ_COAL | IRQ_DLY))
		temac_start_xmit_done(lp->ndev);
	if (status & 0x080)
		dev_err(&ndev->dev, "DMA error 0x%x\n", status);

	return IRQ_HANDLED;
}

static irqreturn_t ll_temac_rx_irq(int irq, void *_ndev)
{
	struct net_device *ndev = _ndev;
	struct temac_local *lp = netdev_priv(ndev);
	unsigned int status;

	/* Read and clear the status registers */
	status = temac_dma_in32(lp, RX_IRQ_REG);
	temac_dma_out32(lp, RX_IRQ_REG, status);

	if (status & (IRQ_COAL | IRQ_DLY))
		ll_temac_recv(lp->ndev);

	return IRQ_HANDLED;
}

static int temac_open(struct net_device *ndev)
{
	struct temac_local *lp = netdev_priv(ndev);
	int rc;

	dev_dbg(&ndev->dev, "temac_open()\n");

	if (lp->phy_node) {
		lp->phy_dev = of_phy_connect(lp->ndev, lp->phy_node,
					     temac_adjust_link, 0, 0);
		if (!lp->phy_dev) {
			dev_err(lp->dev, "of_phy_connect() failed\n");
			return -ENODEV;
		}

		phy_start(lp->phy_dev);
	}

	rc = request_irq(lp->tx_irq, ll_temac_tx_irq, 0, ndev->name, ndev);
	if (rc)
		goto err_tx_irq;
	rc = request_irq(lp->rx_irq, ll_temac_rx_irq, 0, ndev->name, ndev);
	if (rc)
		goto err_rx_irq;

	temac_device_reset(ndev);
	return 0;

 err_rx_irq:
	free_irq(lp->tx_irq, ndev);
 err_tx_irq:
	if (lp->phy_dev)
		phy_disconnect(lp->phy_dev);
	lp->phy_dev = NULL;
	dev_err(lp->dev, "request_irq() failed\n");
	return rc;
}

static int temac_stop(struct net_device *ndev)
{
	struct temac_local *lp = netdev_priv(ndev);

	dev_dbg(&ndev->dev, "temac_close()\n");

	free_irq(lp->tx_irq, ndev);
	free_irq(lp->rx_irq, ndev);

	if (lp->phy_dev)
		phy_disconnect(lp->phy_dev);
	lp->phy_dev = NULL;

	return 0;
}

#ifdef CONFIG_NET_POLL_CONTROLLER
static void
temac_poll_controller(struct net_device *ndev)
{
	struct temac_local *lp = netdev_priv(ndev);

	disable_irq(lp->tx_irq);
	disable_irq(lp->rx_irq);

	ll_temac_rx_irq(lp->tx_irq, lp);
	ll_temac_tx_irq(lp->rx_irq, lp);

	enable_irq(lp->tx_irq);
	enable_irq(lp->rx_irq);
}
#endif

static const struct net_device_ops temac_netdev_ops = {
	.ndo_open = temac_open,
	.ndo_stop = temac_stop,
	.ndo_start_xmit = temac_start_xmit,
	.ndo_set_mac_address = temac_set_mac_address,
	//.ndo_set_multicast_list = temac_set_multicast_list,
#ifdef CONFIG_NET_POLL_CONTROLLER
	.ndo_poll_controller = temac_poll_controller,
#endif
};

/* ---------------------------------------------------------------------
 * SYSFS device attributes
 */
static ssize_t temac_show_llink_regs(struct device *dev,
				     struct device_attribute *attr, char *buf)
{
	struct net_device *ndev = dev_get_drvdata(dev);
	struct temac_local *lp = netdev_priv(ndev);
	int i, len = 0;

	for (i = 0; i < 0x11; i++)
		len += sprintf(buf + len, "%.8x%s", temac_dma_in32(lp, i),
			       (i % 8) == 7 ? "\n" : " ");
	len += sprintf(buf + len, "\n");

	return len;
}

static DEVICE_ATTR(llink_regs, 0440, temac_show_llink_regs, NULL);

static struct attribute *temac_device_attrs[] = {
	&dev_attr_llink_regs.attr,
	NULL,
};

static const struct attribute_group temac_attr_group = {
	.attrs = temac_device_attrs,
};

static int __init
temac_of_probe(struct of_device *op, const struct of_device_id *match)
{
	struct device_node *np;
	struct temac_local *lp;
	struct net_device *ndev;
	const void *addr;
	int size, rc = 0;
	unsigned int dcrs;

	/* Init network device structure */
	ndev = alloc_etherdev(sizeof(*lp));
	if (!ndev) {
		dev_err(&op->dev, "could not allocate device.\n");
		return -ENOMEM;
	}
	ether_setup(ndev);
	dev_set_drvdata(&op->dev, ndev);
	SET_NETDEV_DEV(ndev, &op->dev);
	ndev->flags &= ~IFF_MULTICAST;  /* clear multicast */
	ndev->features = NETIF_F_SG | NETIF_F_FRAGLIST;
	ndev->netdev_ops = &temac_netdev_ops;
#if 0
	ndev->features |= NETIF_F_IP_CSUM; /* Can checksum TCP/UDP over IPv4. */
	ndev->features |= NETIF_F_HW_CSUM; /* Can checksum all the packets. */
	ndev->features |= NETIF_F_IPV6_CSUM; /* Can checksum IPV6 TCP/UDP */
	ndev->features |= NETIF_F_HIGHDMA; /* Can DMA to high memory. */
	ndev->features |= NETIF_F_HW_VLAN_TX; /* Transmit VLAN hw accel */
	ndev->features |= NETIF_F_HW_VLAN_RX; /* Receive VLAN hw acceleration */
	ndev->features |= NETIF_F_HW_VLAN_FILTER; /* Receive VLAN filtering */
	ndev->features |= NETIF_F_VLAN_CHALLENGED; /* cannot handle VLAN pkts */
	ndev->features |= NETIF_F_GSO; /* Enable software GSO. */
	ndev->features |= NETIF_F_MULTI_QUEUE; /* Has multiple TX/RX queues */
	ndev->features |= NETIF_F_LRO; /* large receive offload */
#endif

	/* setup temac private info structure */
	lp = netdev_priv(ndev);
	lp->ndev = ndev;
	lp->dev = &op->dev;
	lp->options = XTE_OPTION_DEFAULTS;
	spin_lock_init(&lp->rx_lock);
	mutex_init(&lp->indirect_mutex);

	/* map device registers */
	lp->regs = of_iomap(op->node, 0);
	if (!lp->regs) {
		dev_err(&op->dev, "could not map temac regs.\n");
		goto nodev;
	}

	/* Find the DMA node, map the DMA registers, and decode the DMA IRQs */
	np = of_parse_phandle(op->node, "llink-connected", 0);
	if (!np) {
		dev_err(&op->dev, "could not find DMA node\n");
		goto nodev;
	}

	dcrs = dcr_resource_start(np, 0);
	if (dcrs == 0) {
		dev_err(&op->dev, "could not get DMA register address\n");
		goto nodev;
	}
	lp->sdma_dcrs = dcr_map(np, dcrs, dcr_resource_len(np, 0));
	dev_dbg(&op->dev, "DCR base: %x\n", dcrs);

	lp->rx_irq = irq_of_parse_and_map(np, 0);
	lp->tx_irq = irq_of_parse_and_map(np, 1);
	if (!lp->rx_irq || !lp->tx_irq) {
		dev_err(&op->dev, "could not determine irqs\n");
		rc = -ENOMEM;
		goto nodev;
	}

	of_node_put(np); /* Finished with the DMA node; drop the reference */

	/* Retrieve the MAC address */
	addr = of_get_property(op->node, "local-mac-address", &size);
	if ((!addr) || (size != 6)) {
		dev_err(&op->dev, "could not find MAC address\n");
		rc = -ENODEV;
		goto nodev;
	}
	temac_set_mac_address(ndev, (void *)addr);

	rc = temac_mdio_setup(lp, op->node);
	if (rc)
		dev_warn(&op->dev, "error registering MDIO bus\n");

	lp->phy_node = of_parse_phandle(op->node, "phy-handle", 0);
	if (lp->phy_node)
		dev_dbg(lp->dev, "using PHY node %s (%p)\n", np->full_name, np);

	/* Add the device attributes */
	rc = sysfs_create_group(&lp->dev->kobj, &temac_attr_group);
	if (rc) {
		dev_err(lp->dev, "Error creating sysfs files\n");
		goto nodev;
	}

	rc = register_netdev(lp->ndev);
	if (rc) {
		dev_err(lp->dev, "register_netdev() error (%i)\n", rc);
		goto err_register_ndev;
	}

	return 0;

 err_register_ndev:
	sysfs_remove_group(&lp->dev->kobj, &temac_attr_group);
 nodev:
	free_netdev(ndev);
	ndev = NULL;
	return rc;
}

static int __devexit temac_of_remove(struct of_device *op)
{
	struct net_device *ndev = dev_get_drvdata(&op->dev);
	struct temac_local *lp = netdev_priv(ndev);

	temac_mdio_teardown(lp);
	unregister_netdev(ndev);
	sysfs_remove_group(&lp->dev->kobj, &temac_attr_group);
	if (lp->phy_node)
		of_node_put(lp->phy_node);
	lp->phy_node = NULL;
	dev_set_drvdata(&op->dev, NULL);
	free_netdev(ndev);
	return 0;
}

static struct of_device_id temac_of_match[] __devinitdata = {
	{ .compatible = "xlnx,xps-ll-temac-1.01.b", },
	{},
};
MODULE_DEVICE_TABLE(of, temac_of_match);

static struct of_platform_driver temac_of_driver = {
	.match_table = temac_of_match,
	.probe = temac_of_probe,
	.remove = __devexit_p(temac_of_remove),
	.driver = {
		.owner = THIS_MODULE,
		.name = "xilinx_temac",
	},
};

static int __init temac_init(void)
{
	return of_register_platform_driver(&temac_of_driver);
}
module_init(temac_init);

static void __exit temac_exit(void)
{
	of_unregister_platform_driver(&temac_of_driver);
}
module_exit(temac_exit);

MODULE_DESCRIPTION("Xilinx LL_TEMAC Ethernet driver");
MODULE_AUTHOR("Yoshio Kashiwagi");
MODULE_LICENSE("GPL");