summaryrefslogtreecommitdiff
path: root/drivers/net/mpc8xx_fec.c
blob: 0a8098519226abc51460c10fa5e5c873cfca23ed (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
852
853
// SPDX-License-Identifier: GPL-2.0+
/*
 * (C) Copyright 2000
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 */

#include <common.h>
#include <command.h>
#include <malloc.h>
#include <net.h>
#include <netdev.h>
#include <asm/cpm_8xx.h>
#include <asm/io.h>

#include <phy.h>
#include <linux/mii.h>

DECLARE_GLOBAL_DATA_PTR;

/* define WANT_MII when MII support is required */
#if defined(CONFIG_SYS_DISCOVER_PHY) || defined(CONFIG_FEC1_PHY) || defined(CONFIG_FEC2_PHY)
#define WANT_MII
#else
#undef WANT_MII
#endif

#if defined(WANT_MII)
#include <miiphy.h>

#if !(defined(CONFIG_MII) || defined(CONFIG_CMD_MII))
#error "CONFIG_MII has to be defined!"
#endif

#endif

#if defined(CONFIG_RMII) && !defined(WANT_MII)
#error RMII support is unusable without a working PHY.
#endif

#ifdef CONFIG_SYS_DISCOVER_PHY
static int mii_discover_phy(struct eth_device *dev);
#endif

int fec8xx_miiphy_read(struct mii_dev *bus, int addr, int devad, int reg);
int fec8xx_miiphy_write(struct mii_dev *bus, int addr, int devad, int reg,
			u16 value);

static struct ether_fcc_info_s
{
	int ether_index;
	int fecp_offset;
	int phy_addr;
	int actual_phy_addr;
	int initialized;
}
	ether_fcc_info[] = {
#if defined(CONFIG_ETHER_ON_FEC1)
	{
		0,
		offsetof(immap_t, im_cpm.cp_fec1),
		CONFIG_FEC1_PHY,
		-1,
		0,

	},
#endif
#if defined(CONFIG_ETHER_ON_FEC2)
	{
		1,
		offsetof(immap_t, im_cpm.cp_fec2),
		CONFIG_FEC2_PHY,
		-1,
		0,
	},
#endif
};

/* Ethernet Transmit and Receive Buffers */
#define DBUF_LENGTH  1520

#define TX_BUF_CNT 2

#define TOUT_LOOP 100

#define PKT_MAXBUF_SIZE		1518
#define PKT_MINBUF_SIZE		64
#define PKT_MAXBLR_SIZE		1520

#ifdef __GNUC__
static char txbuf[DBUF_LENGTH] __aligned(8);
#else
#error txbuf must be aligned.
#endif

static uint rxIdx;	/* index of the current RX buffer */
static uint txIdx;	/* index of the current TX buffer */

/*
  * FEC Ethernet Tx and Rx buffer descriptors allocated at the
  *  immr->udata_bd address on Dual-Port RAM
  * Provide for Double Buffering
  */

struct common_buf_desc {
	cbd_t rxbd[PKTBUFSRX];		/* Rx BD */
	cbd_t txbd[TX_BUF_CNT];		/* Tx BD */
};

static struct common_buf_desc __iomem *rtx;

static int fec_send(struct eth_device *dev, void *packet, int length);
static int fec_recv(struct eth_device *dev);
static int fec_init(struct eth_device *dev, bd_t *bd);
static void fec_halt(struct eth_device *dev);
#if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
static void __mii_init(void);
#endif

int fec_initialize(bd_t *bis)
{
	struct eth_device *dev;
	struct ether_fcc_info_s *efis;
	int             i;

	for (i = 0; i < ARRAY_SIZE(ether_fcc_info); i++) {
		dev = malloc(sizeof(*dev));
		if (dev == NULL)
			hang();

		memset(dev, 0, sizeof(*dev));

		/* for FEC1 make sure that the name of the interface is the same
		   as the old one for compatibility reasons */
		if (i == 0)
			strcpy(dev->name, "FEC");
		else
			sprintf(dev->name, "FEC%d",
				ether_fcc_info[i].ether_index + 1);

		efis = &ether_fcc_info[i];

		/*
		 * reset actual phy addr
		 */
		efis->actual_phy_addr = -1;

		dev->priv = efis;
		dev->init = fec_init;
		dev->halt = fec_halt;
		dev->send = fec_send;
		dev->recv = fec_recv;

		eth_register(dev);

#if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
		int retval;
		struct mii_dev *mdiodev = mdio_alloc();
		if (!mdiodev)
			return -ENOMEM;
		strncpy(mdiodev->name, dev->name, MDIO_NAME_LEN);
		mdiodev->read = fec8xx_miiphy_read;
		mdiodev->write = fec8xx_miiphy_write;

		retval = mdio_register(mdiodev);
		if (retval < 0)
			return retval;
#endif
	}
	return 1;
}

static int fec_send(struct eth_device *dev, void *packet, int length)
{
	int j, rc;
	struct ether_fcc_info_s *efis = dev->priv;
	fec_t __iomem *fecp =
			(fec_t __iomem *)(CONFIG_SYS_IMMR + efis->fecp_offset);

	/* section 16.9.23.3
	 * Wait for ready
	 */
	j = 0;
	while ((in_be16(&rtx->txbd[txIdx].cbd_sc) & BD_ENET_TX_READY) &&
	       (j < TOUT_LOOP)) {
		udelay(1);
		j++;
	}
	if (j >= TOUT_LOOP)
		printf("TX not ready\n");

	out_be32(&rtx->txbd[txIdx].cbd_bufaddr, (uint)packet);
	out_be16(&rtx->txbd[txIdx].cbd_datlen, length);
	setbits_be16(&rtx->txbd[txIdx].cbd_sc,
		     BD_ENET_TX_READY | BD_ENET_TX_LAST);

	/* Activate transmit Buffer Descriptor polling */
	/* Descriptor polling active	*/
	out_be32(&fecp->fec_x_des_active, 0x01000000);

	j = 0;
	while ((in_be16(&rtx->txbd[txIdx].cbd_sc) & BD_ENET_TX_READY) &&
	       (j < TOUT_LOOP)) {
		udelay(1);
		j++;
	}
	if (j >= TOUT_LOOP)
		printf("TX timeout\n");

	/* return only status bits */;
	rc = in_be16(&rtx->txbd[txIdx].cbd_sc) & BD_ENET_TX_STATS;

	txIdx = (txIdx + 1) % TX_BUF_CNT;

	return rc;
}

static int fec_recv(struct eth_device *dev)
{
	struct ether_fcc_info_s *efis = dev->priv;
	fec_t __iomem *fecp =
			(fec_t __iomem *)(CONFIG_SYS_IMMR + efis->fecp_offset);
	int length;

	for (;;) {
		/* section 16.9.23.2 */
		if (in_be16(&rtx->rxbd[rxIdx].cbd_sc) & BD_ENET_RX_EMPTY) {
			length = -1;
			break;	/* nothing received - leave for() loop */
		}

		length = in_be16(&rtx->rxbd[rxIdx].cbd_datlen);

		if (!(in_be16(&rtx->rxbd[rxIdx].cbd_sc) & 0x003f)) {
			uchar *rx = net_rx_packets[rxIdx];

			length -= 4;

#if defined(CONFIG_CMD_CDP)
			if ((rx[0] & 1) != 0 &&
			    memcmp((uchar *)rx, net_bcast_ethaddr, 6) != 0 &&
			    !is_cdp_packet((uchar *)rx))
				rx = NULL;
#endif
			/*
			 * Pass the packet up to the protocol layers.
			 */
			if (rx != NULL)
				net_process_received_packet(rx, length);
		}

		/* Give the buffer back to the FEC. */
		out_be16(&rtx->rxbd[rxIdx].cbd_datlen, 0);

		/* wrap around buffer index when necessary */
		if ((rxIdx + 1) >= PKTBUFSRX) {
			out_be16(&rtx->rxbd[PKTBUFSRX - 1].cbd_sc,
				 BD_ENET_RX_WRAP | BD_ENET_RX_EMPTY);
			rxIdx = 0;
		} else {
			out_be16(&rtx->rxbd[rxIdx].cbd_sc, BD_ENET_RX_EMPTY);
			rxIdx++;
		}

		/* Try to fill Buffer Descriptors */
		/* Descriptor polling active    */
		out_be32(&fecp->fec_r_des_active, 0x01000000);
	}

	return length;
}

/**************************************************************
 *
 * FEC Ethernet Initialization Routine
 *
 *************************************************************/

#define	FEC_ECNTRL_PINMUX	0x00000004
#define FEC_ECNTRL_ETHER_EN	0x00000002
#define FEC_ECNTRL_RESET	0x00000001

#define FEC_RCNTRL_BC_REJ	0x00000010
#define FEC_RCNTRL_PROM		0x00000008
#define FEC_RCNTRL_MII_MODE	0x00000004
#define FEC_RCNTRL_DRT		0x00000002
#define FEC_RCNTRL_LOOP		0x00000001

#define FEC_TCNTRL_FDEN		0x00000004
#define FEC_TCNTRL_HBC		0x00000002
#define FEC_TCNTRL_GTS		0x00000001

#define	FEC_RESET_DELAY		50

#if defined(CONFIG_RMII)

static inline void fec_10Mbps(struct eth_device *dev)
{
	struct ether_fcc_info_s *efis = dev->priv;
	int fecidx = efis->ether_index;
	uint mask = (fecidx == 0) ? 0x0000010 : 0x0000008;
	immap_t __iomem *immr = (immap_t __iomem *)CONFIG_SYS_IMMR;

	if ((unsigned int)fecidx >= 2)
		hang();

	setbits_be32(&immr->im_cpm.cp_cptr, mask);
}

static inline void fec_100Mbps(struct eth_device *dev)
{
	struct ether_fcc_info_s *efis = dev->priv;
	int fecidx = efis->ether_index;
	uint mask = (fecidx == 0) ? 0x0000010 : 0x0000008;
	immap_t __iomem *immr = (immap_t __iomem *)CONFIG_SYS_IMMR;

	if ((unsigned int)fecidx >= 2)
		hang();

	clrbits_be32(&immr->im_cpm.cp_cptr, mask);
}

#endif

static inline void fec_full_duplex(struct eth_device *dev)
{
	struct ether_fcc_info_s *efis = dev->priv;
	fec_t __iomem *fecp =
			(fec_t __iomem *)(CONFIG_SYS_IMMR + efis->fecp_offset);

	clrbits_be32(&fecp->fec_r_cntrl, FEC_RCNTRL_DRT);
	setbits_be32(&fecp->fec_x_cntrl,  FEC_TCNTRL_FDEN);	/* FD enable */
}

static inline void fec_half_duplex(struct eth_device *dev)
{
	struct ether_fcc_info_s *efis = dev->priv;
	fec_t __iomem *fecp =
			(fec_t __iomem *)(CONFIG_SYS_IMMR + efis->fecp_offset);

	setbits_be32(&fecp->fec_r_cntrl, FEC_RCNTRL_DRT);
	clrbits_be32(&fecp->fec_x_cntrl,  FEC_TCNTRL_FDEN);	/* FD disable */
}

static void fec_pin_init(int fecidx)
{
	bd_t           *bd = gd->bd;
	immap_t __iomem *immr = (immap_t __iomem *)CONFIG_SYS_IMMR;

	/*
	 * Set MII speed to 2.5 MHz or slightly below.
	 *
	 * According to the MPC860T (Rev. D) Fast ethernet controller user
	 * manual (6.2.14),
	 * the MII management interface clock must be less than or equal
	 * to 2.5 MHz.
	 * This MDC frequency is equal to system clock / (2 * MII_SPEED).
	 * Then MII_SPEED = system_clock / 2 * 2,5 MHz.
	 *
	 * All MII configuration is done via FEC1 registers:
	 */
	out_be32(&immr->im_cpm.cp_fec1.fec_mii_speed,
		 ((bd->bi_intfreq + 4999999) / 5000000) << 1);

#if defined(CONFIG_MPC885) && defined(WANT_MII)
	/* use MDC for MII */
	setbits_be16(&immr->im_ioport.iop_pdpar, 0x0080);
	clrbits_be16(&immr->im_ioport.iop_pddir, 0x0080);
#endif

	if (fecidx == 0) {
#if defined(CONFIG_ETHER_ON_FEC1)

#if defined(CONFIG_MPC885) /* MPC87x/88x have got 2 FECs and different pinout */

#if !defined(CONFIG_RMII)

		setbits_be16(&immr->im_ioport.iop_papar, 0xf830);
		setbits_be16(&immr->im_ioport.iop_padir, 0x0830);
		clrbits_be16(&immr->im_ioport.iop_padir, 0xf000);

		setbits_be32(&immr->im_cpm.cp_pbpar, 0x00001001);
		clrbits_be32(&immr->im_cpm.cp_pbdir, 0x00001001);

		setbits_be16(&immr->im_ioport.iop_pcpar, 0x000c);
		clrbits_be16(&immr->im_ioport.iop_pcdir, 0x000c);

		setbits_be32(&immr->im_cpm.cp_pepar, 0x00000003);
		setbits_be32(&immr->im_cpm.cp_pedir, 0x00000003);
		clrbits_be32(&immr->im_cpm.cp_peso, 0x00000003);

		clrbits_be32(&immr->im_cpm.cp_cptr, 0x00000100);

#else

#if !defined(CONFIG_FEC1_PHY_NORXERR)
		setbits_be16(&immr->im_ioport.iop_papar, 0x1000);
		clrbits_be16(&immr->im_ioport.iop_padir, 0x1000);
#endif
		setbits_be16(&immr->im_ioport.iop_papar, 0xe810);
		setbits_be16(&immr->im_ioport.iop_padir, 0x0810);
		clrbits_be16(&immr->im_ioport.iop_padir, 0xe000);

		setbits_be32(&immr->im_cpm.cp_pbpar, 0x00000001);
		clrbits_be32(&immr->im_cpm.cp_pbdir, 0x00000001);

		setbits_be32(&immr->im_cpm.cp_cptr, 0x00000100);
		clrbits_be32(&immr->im_cpm.cp_cptr, 0x00000050);

#endif /* !CONFIG_RMII */

#else
		/*
		 * Configure all of port D for MII.
		 */
		out_be16(&immr->im_ioport.iop_pdpar, 0x1fff);
		out_be16(&immr->im_ioport.iop_pddir, 0x1fff);

#if defined(CONFIG_TARGET_MCR3000)
		out_be16(&immr->im_ioport.iop_papar, 0xBBFF);
		out_be16(&immr->im_ioport.iop_padir, 0x04F0);
		out_be16(&immr->im_ioport.iop_paodr, 0x0000);

		out_be32(&immr->im_cpm.cp_pbpar, 0x000133FF);
		out_be32(&immr->im_cpm.cp_pbdir, 0x0003BF0F);
		out_be16(&immr->im_cpm.cp_pbodr, 0x0000);

		out_be16(&immr->im_ioport.iop_pcpar, 0x0400);
		out_be16(&immr->im_ioport.iop_pcdir, 0x0080);
		out_be16(&immr->im_ioport.iop_pcso , 0x0D53);
		out_be16(&immr->im_ioport.iop_pcint, 0x0000);

		out_be16(&immr->im_ioport.iop_pdpar, 0x03FE);
		out_be16(&immr->im_ioport.iop_pddir, 0x1C09);

		setbits_be32(&immr->im_ioport.utmode, 0x80);
#endif
#endif

#endif	/* CONFIG_ETHER_ON_FEC1 */
	} else if (fecidx == 1) {
#if defined(CONFIG_ETHER_ON_FEC2)

#if defined(CONFIG_MPC885) /* MPC87x/88x have got 2 FECs and different pinout */

#if !defined(CONFIG_RMII)
		setbits_be32(&immr->im_cpm.cp_pepar, 0x0003fffc);
		setbits_be32(&immr->im_cpm.cp_pedir, 0x0003fffc);
		clrbits_be32(&immr->im_cpm.cp_peso, 0x000087fc);
		setbits_be32(&immr->im_cpm.cp_peso, 0x00037800);

		clrbits_be32(&immr->im_cpm.cp_cptr, 0x00000080);
#else

#if !defined(CONFIG_FEC2_PHY_NORXERR)
		setbits_be32(&immr->im_cpm.cp_pepar, 0x00000010);
		setbits_be32(&immr->im_cpm.cp_pedir, 0x00000010);
		clrbits_be32(&immr->im_cpm.cp_peso, 0x00000010);
#endif
		setbits_be32(&immr->im_cpm.cp_pepar, 0x00039620);
		setbits_be32(&immr->im_cpm.cp_pedir, 0x00039620);
		setbits_be32(&immr->im_cpm.cp_peso, 0x00031000);
		clrbits_be32(&immr->im_cpm.cp_peso, 0x00008620);

		setbits_be32(&immr->im_cpm.cp_cptr, 0x00000080);
		clrbits_be32(&immr->im_cpm.cp_cptr, 0x00000028);
#endif /* CONFIG_RMII */

#endif /* CONFIG_MPC885 */

#endif /* CONFIG_ETHER_ON_FEC2 */
	}
}

static int fec_reset(fec_t __iomem *fecp)
{
	int i;

	/* Whack a reset.
	 * A delay is required between a reset of the FEC block and
	 * initialization of other FEC registers because the reset takes
	 * some time to complete. If you don't delay, subsequent writes
	 * to FEC registers might get killed by the reset routine which is
	 * still in progress.
	 */

	out_be32(&fecp->fec_ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_RESET);
	for (i = 0; (in_be32(&fecp->fec_ecntrl) & FEC_ECNTRL_RESET) &&
	     (i < FEC_RESET_DELAY); ++i)
		udelay(1);

	if (i == FEC_RESET_DELAY)
		return -1;

	return 0;
}

static int fec_init(struct eth_device *dev, bd_t *bd)
{
	struct ether_fcc_info_s *efis = dev->priv;
	immap_t __iomem *immr = (immap_t __iomem *)CONFIG_SYS_IMMR;
	fec_t __iomem *fecp =
			(fec_t __iomem *)(CONFIG_SYS_IMMR + efis->fecp_offset);
	int i;

#if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
	/* the MII interface is connected to FEC1
	 * so for the miiphy_xxx function to work we must
	 * call mii_init since fec_halt messes the thing up
	 */
	if (efis->ether_index != 0)
		__mii_init();
#endif

	if (fec_reset(fecp) < 0)
		printf("FEC_RESET_DELAY timeout\n");

	/* We use strictly polling mode only
	 */
	out_be32(&fecp->fec_imask, 0);

	/* Clear any pending interrupt
	 */
	out_be32(&fecp->fec_ievent, 0xffc0);

	/* No need to set the IVEC register */

	/* Set station address
	 */
#define ea dev->enetaddr
	out_be32(&fecp->fec_addr_low, (ea[0] << 24) | (ea[1] << 16) |
				      (ea[2] << 8) | ea[3]);
	out_be16(&fecp->fec_addr_high, (ea[4] << 8) | ea[5]);
#undef ea

#if defined(CONFIG_CMD_CDP)
	/*
	 * Turn on multicast address hash table
	 */
	out_be32(&fecp->fec_hash_table_high, 0xffffffff);
	out_be32(&fecp->fec_hash_table_low, 0xffffffff);
#else
	/* Clear multicast address hash table
	 */
	out_be32(&fecp->fec_hash_table_high, 0);
	out_be32(&fecp->fec_hash_table_low, 0);
#endif

	/* Set maximum receive buffer size.
	 */
	out_be32(&fecp->fec_r_buff_size, PKT_MAXBLR_SIZE);

	/* Set maximum frame length
	 */
	out_be32(&fecp->fec_r_hash, PKT_MAXBUF_SIZE);

	/*
	 * Setup Buffers and Buffer Descriptors
	 */
	rxIdx = 0;
	txIdx = 0;

	if (!rtx)
		rtx = (struct common_buf_desc __iomem *)
		      (immr->im_cpm.cp_dpmem + CPM_FEC_BASE);
	/*
	 * Setup Receiver Buffer Descriptors (13.14.24.18)
	 * Settings:
	 *     Empty, Wrap
	 */
	for (i = 0; i < PKTBUFSRX; i++) {
		out_be16(&rtx->rxbd[i].cbd_sc, BD_ENET_RX_EMPTY);
		out_be16(&rtx->rxbd[i].cbd_datlen, 0);	/* Reset */
		out_be32(&rtx->rxbd[i].cbd_bufaddr, (uint)net_rx_packets[i]);
	}
	setbits_be16(&rtx->rxbd[PKTBUFSRX - 1].cbd_sc, BD_ENET_RX_WRAP);

	/*
	 * Setup Ethernet Transmitter Buffer Descriptors (13.14.24.19)
	 * Settings:
	 *    Last, Tx CRC
	 */
	for (i = 0; i < TX_BUF_CNT; i++) {
		out_be16(&rtx->txbd[i].cbd_sc, BD_ENET_TX_LAST | BD_ENET_TX_TC);
		out_be16(&rtx->txbd[i].cbd_datlen, 0);	/* Reset */
		out_be32(&rtx->txbd[i].cbd_bufaddr, (uint)txbuf);
	}
	setbits_be16(&rtx->txbd[TX_BUF_CNT - 1].cbd_sc, BD_ENET_TX_WRAP);

	/* Set receive and transmit descriptor base
	 */
	out_be32(&fecp->fec_r_des_start, (__force unsigned int)rtx->rxbd);
	out_be32(&fecp->fec_x_des_start, (__force unsigned int)rtx->txbd);

	/* Enable MII mode
	 */
	/* Half duplex mode */
	out_be32(&fecp->fec_r_cntrl, FEC_RCNTRL_MII_MODE | FEC_RCNTRL_DRT);
	out_be32(&fecp->fec_x_cntrl, 0);

	/* Enable big endian and don't care about SDMA FC.
	 */
	out_be32(&fecp->fec_fun_code, 0x78000000);

	/*
	 * Setup the pin configuration of the FEC
	 */
	fec_pin_init(efis->ether_index);

	rxIdx = 0;
	txIdx = 0;

	/*
	 * Now enable the transmit and receive processing
	 */
	out_be32(&fecp->fec_ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_ETHER_EN);

	if (efis->phy_addr == -1) {
#ifdef CONFIG_SYS_DISCOVER_PHY
		/*
		 * wait for the PHY to wake up after reset
		 */
		efis->actual_phy_addr = mii_discover_phy(dev);

		if (efis->actual_phy_addr == -1) {
			printf("Unable to discover phy!\n");
			return -1;
		}
#else
		efis->actual_phy_addr = -1;
#endif
	} else {
		efis->actual_phy_addr = efis->phy_addr;
	}

#if defined(CONFIG_MII) && defined(CONFIG_RMII)
	/*
	 * adapt the RMII speed to the speed of the phy
	 */
	if (miiphy_speed(dev->name, efis->actual_phy_addr) == _100BASET)
		fec_100Mbps(dev);
	else
		fec_10Mbps(dev);
#endif

#if defined(CONFIG_MII)
	/*
	 * adapt to the half/full speed settings
	 */
	if (miiphy_duplex(dev->name, efis->actual_phy_addr) == FULL)
		fec_full_duplex(dev);
	else
		fec_half_duplex(dev);
#endif

	/* And last, try to fill Rx Buffer Descriptors */
	/* Descriptor polling active    */
	out_be32(&fecp->fec_r_des_active, 0x01000000);

	efis->initialized = 1;

	return 0;
}


static void fec_halt(struct eth_device *dev)
{
	struct ether_fcc_info_s *efis = dev->priv;
	fec_t __iomem *fecp =
			(fec_t __iomem *)(CONFIG_SYS_IMMR + efis->fecp_offset);
	int i;

	/* avoid halt if initialized; mii gets stuck otherwise */
	if (!efis->initialized)
		return;

	/* Whack a reset.
	 * A delay is required between a reset of the FEC block and
	 * initialization of other FEC registers because the reset takes
	 * some time to complete. If you don't delay, subsequent writes
	 * to FEC registers might get killed by the reset routine which is
	 * still in progress.
	 */

	out_be32(&fecp->fec_ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_RESET);
	for (i = 0; (in_be32(&fecp->fec_ecntrl) & FEC_ECNTRL_RESET) &&
	     (i < FEC_RESET_DELAY); ++i)
		udelay(1);

	if (i == FEC_RESET_DELAY) {
		printf("FEC_RESET_DELAY timeout\n");
		return;
	}

	efis->initialized = 0;
}

#if defined(CONFIG_SYS_DISCOVER_PHY) || defined(CONFIG_MII) || defined(CONFIG_CMD_MII)

/* Make MII read/write commands for the FEC.
*/

#define mk_mii_read(ADDR, REG)	(0x60020000 | ((ADDR << 23) | \
						(REG & 0x1f) << 18))

#define mk_mii_write(ADDR, REG, VAL)	(0x50020000 | ((ADDR << 23) | \
						(REG & 0x1f) << 18) | \
						(VAL & 0xffff))

/* Interrupt events/masks.
*/
#define FEC_ENET_HBERR	((uint)0x80000000)	/* Heartbeat error */
#define FEC_ENET_BABR	((uint)0x40000000)	/* Babbling receiver */
#define FEC_ENET_BABT	((uint)0x20000000)	/* Babbling transmitter */
#define FEC_ENET_GRA	((uint)0x10000000)	/* Graceful stop complete */
#define FEC_ENET_TXF	((uint)0x08000000)	/* Full frame transmitted */
#define FEC_ENET_TXB	((uint)0x04000000)	/* A buffer was transmitted */
#define FEC_ENET_RXF	((uint)0x02000000)	/* Full frame received */
#define FEC_ENET_RXB	((uint)0x01000000)	/* A buffer was received */
#define FEC_ENET_MII	((uint)0x00800000)	/* MII interrupt */
#define FEC_ENET_EBERR	((uint)0x00400000)	/* SDMA bus error */

/* send command to phy using mii, wait for result */
static uint
mii_send(uint mii_cmd)
{
	uint mii_reply;
	fec_t __iomem *ep;
	int cnt;
	immap_t __iomem *immr = (immap_t __iomem *)CONFIG_SYS_IMMR;

	ep = &immr->im_cpm.cp_fec;

	out_be32(&ep->fec_mii_data, mii_cmd);	/* command to phy */

	/* wait for mii complete */
	cnt = 0;
	while (!(in_be32(&ep->fec_ievent) & FEC_ENET_MII)) {
		if (++cnt > 1000) {
			printf("mii_send STUCK!\n");
			break;
		}
	}
	mii_reply = in_be32(&ep->fec_mii_data);		/* result from phy */
	out_be32(&ep->fec_ievent, FEC_ENET_MII);	/* clear MII complete */
	return mii_reply & 0xffff;		/* data read from phy */
}
#endif

#if defined(CONFIG_SYS_DISCOVER_PHY)
static int mii_discover_phy(struct eth_device *dev)
{
#define MAX_PHY_PASSES 11
	uint phyno;
	int  pass;
	uint phytype;
	int phyaddr;

	phyaddr = -1;	/* didn't find a PHY yet */
	for (pass = 1; pass <= MAX_PHY_PASSES && phyaddr < 0; ++pass) {
		if (pass > 1) {
			/* PHY may need more time to recover from reset.
			 * The LXT970 needs 50ms typical, no maximum is
			 * specified, so wait 10ms before try again.
			 * With 11 passes this gives it 100ms to wake up.
			 */
			udelay(10000);	/* wait 10ms */
		}
		for (phyno = 0; phyno < 32 && phyaddr < 0; ++phyno) {
			phytype = mii_send(mk_mii_read(phyno, MII_PHYSID2));
			if (phytype != 0xffff) {
				phyaddr = phyno;
				phytype |= mii_send(mk_mii_read(phyno,
								MII_PHYSID1)) << 16;
			}
		}
	}
	if (phyaddr < 0)
		printf("No PHY device found.\n");

	return phyaddr;
}
#endif	/* CONFIG_SYS_DISCOVER_PHY */

#if (defined(CONFIG_MII) || defined(CONFIG_CMD_MII)) && !defined(CONFIG_BITBANGMII)

/****************************************************************************
 * mii_init -- Initialize the MII via FEC 1 for MII command without ethernet
 * This function is a subset of eth_init
 ****************************************************************************
 */
static void __mii_init(void)
{
	immap_t __iomem *immr = (immap_t __iomem *)CONFIG_SYS_IMMR;
	fec_t __iomem *fecp = &immr->im_cpm.cp_fec;

	if (fec_reset(fecp) < 0)
		printf("FEC_RESET_DELAY timeout\n");

	/* We use strictly polling mode only
	 */
	out_be32(&fecp->fec_imask, 0);

	/* Clear any pending interrupt
	 */
	out_be32(&fecp->fec_ievent, 0xffc0);

	/* Now enable the transmit and receive processing
	 */
	out_be32(&fecp->fec_ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_ETHER_EN);
}

void mii_init(void)
{
	int i;

	__mii_init();

	/* Setup the pin configuration of the FEC(s)
	*/
	for (i = 0; i < ARRAY_SIZE(ether_fcc_info); i++)
		fec_pin_init(ether_fcc_info[i].ether_index);
}

/*****************************************************************************
 * Read and write a MII PHY register, routines used by MII Utilities
 *
 * FIXME: These routines are expected to return 0 on success, but mii_send
 *	  does _not_ return an error code. Maybe 0xFFFF means error, i.e.
 *	  no PHY connected...
 *	  For now always return 0.
 * FIXME: These routines only work after calling eth_init() at least once!
 *	  Otherwise they hang in mii_send() !!! Sorry!
 *****************************************************************************/

int fec8xx_miiphy_read(struct mii_dev *bus, int addr, int devad, int reg)
{
	unsigned short value = 0;
	short rdreg;    /* register working value */

	rdreg = mii_send(mk_mii_read(addr, reg));

	value = rdreg;
	return value;
}

int fec8xx_miiphy_write(struct mii_dev *bus, int addr, int devad, int reg,
			u16 value)
{
	(void)mii_send(mk_mii_write(addr, reg, value));

	return 0;
}
#endif